diff options
Diffstat (limited to 'binutils-2.24/bfd/elf32-i386.c')
| -rw-r--r-- | binutils-2.24/bfd/elf32-i386.c | 5369 |
1 files changed, 0 insertions, 5369 deletions
diff --git a/binutils-2.24/bfd/elf32-i386.c b/binutils-2.24/bfd/elf32-i386.c deleted file mode 100644 index cfb417ad..00000000 --- a/binutils-2.24/bfd/elf32-i386.c +++ /dev/null @@ -1,5369 +0,0 @@ -/* Intel 80386/80486-specific support for 32-bit ELF - Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, - 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 - Free Software Foundation, Inc. - - This file is part of BFD, the Binary File Descriptor library. - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 3 of the License, or - (at your option) any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, - MA 02110-1301, USA. */ - -#include "sysdep.h" -#include "bfd.h" -#include "bfdlink.h" -#include "libbfd.h" -#include "elf-bfd.h" -#include "elf-nacl.h" -#include "elf-vxworks.h" -#include "bfd_stdint.h" -#include "objalloc.h" -#include "hashtab.h" -#include "dwarf2.h" - -/* 386 uses REL relocations instead of RELA. */ -#define USE_REL 1 - -#include "elf/i386.h" - -static reloc_howto_type elf_howto_table[]= -{ - HOWTO(R_386_NONE, 0, 0, 0, FALSE, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_386_NONE", - TRUE, 0x00000000, 0x00000000, FALSE), - HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_386_32", - TRUE, 0xffffffff, 0xffffffff, FALSE), - HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_386_PC32", - TRUE, 0xffffffff, 0xffffffff, TRUE), - HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_386_GOT32", - TRUE, 0xffffffff, 0xffffffff, FALSE), - HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_386_PLT32", - TRUE, 0xffffffff, 0xffffffff, TRUE), - HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_386_COPY", - TRUE, 0xffffffff, 0xffffffff, FALSE), - HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_386_GLOB_DAT", - TRUE, 0xffffffff, 0xffffffff, FALSE), - HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_386_JUMP_SLOT", - TRUE, 0xffffffff, 0xffffffff, FALSE), - HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_386_RELATIVE", - TRUE, 0xffffffff, 0xffffffff, FALSE), - HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_386_GOTOFF", - TRUE, 0xffffffff, 0xffffffff, FALSE), - HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_386_GOTPC", - TRUE, 0xffffffff, 0xffffffff, TRUE), - - /* We have a gap in the reloc numbers here. - R_386_standard counts the number up to this point, and - R_386_ext_offset is the value to subtract from a reloc type of - R_386_16 thru R_386_PC8 to form an index into this table. */ -#define R_386_standard (R_386_GOTPC + 1) -#define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard) - - /* These relocs are a GNU extension. */ - HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_386_TLS_TPOFF", - TRUE, 0xffffffff, 0xffffffff, FALSE), - HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_386_TLS_IE", - TRUE, 0xffffffff, 0xffffffff, FALSE), - HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_386_TLS_GOTIE", - TRUE, 0xffffffff, 0xffffffff, FALSE), - HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_386_TLS_LE", - TRUE, 0xffffffff, 0xffffffff, FALSE), - HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_386_TLS_GD", - TRUE, 0xffffffff, 0xffffffff, FALSE), - HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_386_TLS_LDM", - TRUE, 0xffffffff, 0xffffffff, FALSE), - HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_386_16", - TRUE, 0xffff, 0xffff, FALSE), - HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_386_PC16", - TRUE, 0xffff, 0xffff, TRUE), - HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_386_8", - TRUE, 0xff, 0xff, FALSE), - HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed, - bfd_elf_generic_reloc, "R_386_PC8", - TRUE, 0xff, 0xff, TRUE), - -#define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset) -#define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext) - /* These are common with Solaris TLS implementation. */ - HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_386_TLS_LDO_32", - TRUE, 0xffffffff, 0xffffffff, FALSE), - HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_386_TLS_IE_32", - TRUE, 0xffffffff, 0xffffffff, FALSE), - HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_386_TLS_LE_32", - TRUE, 0xffffffff, 0xffffffff, FALSE), - HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32", - TRUE, 0xffffffff, 0xffffffff, FALSE), - HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32", - TRUE, 0xffffffff, 0xffffffff, FALSE), - HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_386_TLS_TPOFF32", - TRUE, 0xffffffff, 0xffffffff, FALSE), - HOWTO(R_386_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned, - bfd_elf_generic_reloc, "R_386_SIZE32", - TRUE, 0xffffffff, 0xffffffff, FALSE), - HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_386_TLS_GOTDESC", - TRUE, 0xffffffff, 0xffffffff, FALSE), - HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont, - bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL", - FALSE, 0, 0, FALSE), - HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_386_TLS_DESC", - TRUE, 0xffffffff, 0xffffffff, FALSE), - HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, - bfd_elf_generic_reloc, "R_386_IRELATIVE", - TRUE, 0xffffffff, 0xffffffff, FALSE), - - /* Another gap. */ -#define R_386_irelative (R_386_IRELATIVE + 1 - R_386_tls_offset) -#define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_irelative) - -/* GNU extension to record C++ vtable hierarchy. */ - HOWTO (R_386_GNU_VTINHERIT, /* type */ - 0, /* rightshift */ - 2, /* size (0 = byte, 1 = short, 2 = long) */ - 0, /* bitsize */ - FALSE, /* pc_relative */ - 0, /* bitpos */ - complain_overflow_dont, /* complain_on_overflow */ - NULL, /* special_function */ - "R_386_GNU_VTINHERIT", /* name */ - FALSE, /* partial_inplace */ - 0, /* src_mask */ - 0, /* dst_mask */ - FALSE), /* pcrel_offset */ - -/* GNU extension to record C++ vtable member usage. */ - HOWTO (R_386_GNU_VTENTRY, /* type */ - 0, /* rightshift */ - 2, /* size (0 = byte, 1 = short, 2 = long) */ - 0, /* bitsize */ - FALSE, /* pc_relative */ - 0, /* bitpos */ - complain_overflow_dont, /* complain_on_overflow */ - _bfd_elf_rel_vtable_reloc_fn, /* special_function */ - "R_386_GNU_VTENTRY", /* name */ - FALSE, /* partial_inplace */ - 0, /* src_mask */ - 0, /* dst_mask */ - FALSE) /* pcrel_offset */ - -#define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset) - -}; - -#ifdef DEBUG_GEN_RELOC -#define TRACE(str) \ - fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str) -#else -#define TRACE(str) -#endif - -static reloc_howto_type * -elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, - bfd_reloc_code_real_type code) -{ - switch (code) - { - case BFD_RELOC_NONE: - TRACE ("BFD_RELOC_NONE"); - return &elf_howto_table[R_386_NONE]; - - case BFD_RELOC_32: - TRACE ("BFD_RELOC_32"); - return &elf_howto_table[R_386_32]; - - case BFD_RELOC_CTOR: - TRACE ("BFD_RELOC_CTOR"); - return &elf_howto_table[R_386_32]; - - case BFD_RELOC_32_PCREL: - TRACE ("BFD_RELOC_PC32"); - return &elf_howto_table[R_386_PC32]; - - case BFD_RELOC_386_GOT32: - TRACE ("BFD_RELOC_386_GOT32"); - return &elf_howto_table[R_386_GOT32]; - - case BFD_RELOC_386_PLT32: - TRACE ("BFD_RELOC_386_PLT32"); - return &elf_howto_table[R_386_PLT32]; - - case BFD_RELOC_386_COPY: - TRACE ("BFD_RELOC_386_COPY"); - return &elf_howto_table[R_386_COPY]; - - case BFD_RELOC_386_GLOB_DAT: - TRACE ("BFD_RELOC_386_GLOB_DAT"); - return &elf_howto_table[R_386_GLOB_DAT]; - - case BFD_RELOC_386_JUMP_SLOT: - TRACE ("BFD_RELOC_386_JUMP_SLOT"); - return &elf_howto_table[R_386_JUMP_SLOT]; - - case BFD_RELOC_386_RELATIVE: - TRACE ("BFD_RELOC_386_RELATIVE"); - return &elf_howto_table[R_386_RELATIVE]; - - case BFD_RELOC_386_GOTOFF: - TRACE ("BFD_RELOC_386_GOTOFF"); - return &elf_howto_table[R_386_GOTOFF]; - - case BFD_RELOC_386_GOTPC: - TRACE ("BFD_RELOC_386_GOTPC"); - return &elf_howto_table[R_386_GOTPC]; - - /* These relocs are a GNU extension. */ - case BFD_RELOC_386_TLS_TPOFF: - TRACE ("BFD_RELOC_386_TLS_TPOFF"); - return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset]; - - case BFD_RELOC_386_TLS_IE: - TRACE ("BFD_RELOC_386_TLS_IE"); - return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset]; - - case BFD_RELOC_386_TLS_GOTIE: - TRACE ("BFD_RELOC_386_TLS_GOTIE"); - return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset]; - - case BFD_RELOC_386_TLS_LE: - TRACE ("BFD_RELOC_386_TLS_LE"); - return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset]; - - case BFD_RELOC_386_TLS_GD: - TRACE ("BFD_RELOC_386_TLS_GD"); - return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset]; - - case BFD_RELOC_386_TLS_LDM: - TRACE ("BFD_RELOC_386_TLS_LDM"); - return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset]; - - case BFD_RELOC_16: - TRACE ("BFD_RELOC_16"); - return &elf_howto_table[R_386_16 - R_386_ext_offset]; - - case BFD_RELOC_16_PCREL: - TRACE ("BFD_RELOC_16_PCREL"); - return &elf_howto_table[R_386_PC16 - R_386_ext_offset]; - - case BFD_RELOC_8: - TRACE ("BFD_RELOC_8"); - return &elf_howto_table[R_386_8 - R_386_ext_offset]; - - case BFD_RELOC_8_PCREL: - TRACE ("BFD_RELOC_8_PCREL"); - return &elf_howto_table[R_386_PC8 - R_386_ext_offset]; - - /* Common with Sun TLS implementation. */ - case BFD_RELOC_386_TLS_LDO_32: - TRACE ("BFD_RELOC_386_TLS_LDO_32"); - return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset]; - - case BFD_RELOC_386_TLS_IE_32: - TRACE ("BFD_RELOC_386_TLS_IE_32"); - return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset]; - - case BFD_RELOC_386_TLS_LE_32: - TRACE ("BFD_RELOC_386_TLS_LE_32"); - return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset]; - - case BFD_RELOC_386_TLS_DTPMOD32: - TRACE ("BFD_RELOC_386_TLS_DTPMOD32"); - return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset]; - - case BFD_RELOC_386_TLS_DTPOFF32: - TRACE ("BFD_RELOC_386_TLS_DTPOFF32"); - return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset]; - - case BFD_RELOC_386_TLS_TPOFF32: - TRACE ("BFD_RELOC_386_TLS_TPOFF32"); - return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset]; - - case BFD_RELOC_SIZE32: - TRACE ("BFD_RELOC_SIZE32"); - return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset]; - - case BFD_RELOC_386_TLS_GOTDESC: - TRACE ("BFD_RELOC_386_TLS_GOTDESC"); - return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset]; - - case BFD_RELOC_386_TLS_DESC_CALL: - TRACE ("BFD_RELOC_386_TLS_DESC_CALL"); - return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset]; - - case BFD_RELOC_386_TLS_DESC: - TRACE ("BFD_RELOC_386_TLS_DESC"); - return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset]; - - case BFD_RELOC_386_IRELATIVE: - TRACE ("BFD_RELOC_386_IRELATIVE"); - return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset]; - - case BFD_RELOC_VTABLE_INHERIT: - TRACE ("BFD_RELOC_VTABLE_INHERIT"); - return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset]; - - case BFD_RELOC_VTABLE_ENTRY: - TRACE ("BFD_RELOC_VTABLE_ENTRY"); - return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset]; - - default: - break; - } - - TRACE ("Unknown"); - return 0; -} - -static reloc_howto_type * -elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, - const char *r_name) -{ - unsigned int i; - - for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++) - if (elf_howto_table[i].name != NULL - && strcasecmp (elf_howto_table[i].name, r_name) == 0) - return &elf_howto_table[i]; - - return NULL; -} - -static reloc_howto_type * -elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type) -{ - unsigned int indx; - - if ((indx = r_type) >= R_386_standard - && ((indx = r_type - R_386_ext_offset) - R_386_standard - >= R_386_ext - R_386_standard) - && ((indx = r_type - R_386_tls_offset) - R_386_ext - >= R_386_irelative - R_386_ext) - && ((indx = r_type - R_386_vt_offset) - R_386_irelative - >= R_386_vt - R_386_irelative)) - { - (*_bfd_error_handler) (_("%B: invalid relocation type %d"), - abfd, (int) r_type); - indx = R_386_NONE; - } - BFD_ASSERT (elf_howto_table [indx].type == r_type); - return &elf_howto_table[indx]; -} - -static void -elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED, - arelent *cache_ptr, - Elf_Internal_Rela *dst) -{ - unsigned int r_type = ELF32_R_TYPE (dst->r_info); - cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type); -} - -/* Return whether a symbol name implies a local label. The UnixWare - 2.1 cc generates temporary symbols that start with .X, so we - recognize them here. FIXME: do other SVR4 compilers also use .X?. - If so, we should move the .X recognition into - _bfd_elf_is_local_label_name. */ - -static bfd_boolean -elf_i386_is_local_label_name (bfd *abfd, const char *name) -{ - if (name[0] == '.' && name[1] == 'X') - return TRUE; - - return _bfd_elf_is_local_label_name (abfd, name); -} - -/* Support for core dump NOTE sections. */ - -static bfd_boolean -elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) -{ - int offset; - size_t size; - - if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0) - { - int pr_version = bfd_get_32 (abfd, note->descdata); - - if (pr_version != 1) - return FALSE; - - /* pr_cursig */ - elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20); - - /* pr_pid */ - elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24); - - /* pr_reg */ - offset = 28; - size = bfd_get_32 (abfd, note->descdata + 8); - } - else - { - switch (note->descsz) - { - default: - return FALSE; - - case 144: /* Linux/i386 */ - /* pr_cursig */ - elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12); - - /* pr_pid */ - elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24); - - /* pr_reg */ - offset = 72; - size = 68; - - break; - } - } - - /* Make a ".reg/999" section. */ - return _bfd_elfcore_make_pseudosection (abfd, ".reg", - size, note->descpos + offset); -} - -static bfd_boolean -elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) -{ - if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0) - { - int pr_version = bfd_get_32 (abfd, note->descdata); - - if (pr_version != 1) - return FALSE; - - elf_tdata (abfd)->core->program - = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17); - elf_tdata (abfd)->core->command - = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81); - } - else - { - switch (note->descsz) - { - default: - return FALSE; - - case 124: /* Linux/i386 elf_prpsinfo. */ - elf_tdata (abfd)->core->pid - = bfd_get_32 (abfd, note->descdata + 12); - elf_tdata (abfd)->core->program - = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); - elf_tdata (abfd)->core->command - = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); - } - } - - /* Note that for some reason, a spurious space is tacked - onto the end of the args in some (at least one anyway) - implementations, so strip it off if it exists. */ - { - char *command = elf_tdata (abfd)->core->command; - int n = strlen (command); - - if (0 < n && command[n - 1] == ' ') - command[n - 1] = '\0'; - } - - return TRUE; -} - -/* Functions for the i386 ELF linker. - - In order to gain some understanding of code in this file without - knowing all the intricate details of the linker, note the - following: - - Functions named elf_i386_* are called by external routines, other - functions are only called locally. elf_i386_* functions appear - in this file more or less in the order in which they are called - from external routines. eg. elf_i386_check_relocs is called - early in the link process, elf_i386_finish_dynamic_sections is - one of the last functions. */ - - -/* The name of the dynamic interpreter. This is put in the .interp - section. */ - -#define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" - -/* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid - copying dynamic variables from a shared lib into an app's dynbss - section, and instead use a dynamic relocation to point into the - shared lib. */ -#define ELIMINATE_COPY_RELOCS 1 - -/* The size in bytes of an entry in the procedure linkage table. */ - -#define PLT_ENTRY_SIZE 16 - -/* The first entry in an absolute procedure linkage table looks like - this. See the SVR4 ABI i386 supplement to see how this works. - Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */ - -static const bfd_byte elf_i386_plt0_entry[12] = -{ - 0xff, 0x35, /* pushl contents of address */ - 0, 0, 0, 0, /* replaced with address of .got + 4. */ - 0xff, 0x25, /* jmp indirect */ - 0, 0, 0, 0 /* replaced with address of .got + 8. */ -}; - -/* Subsequent entries in an absolute procedure linkage table look like - this. */ - -static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] = -{ - 0xff, 0x25, /* jmp indirect */ - 0, 0, 0, 0, /* replaced with address of this symbol in .got. */ - 0x68, /* pushl immediate */ - 0, 0, 0, 0, /* replaced with offset into relocation table. */ - 0xe9, /* jmp relative */ - 0, 0, 0, 0 /* replaced with offset to start of .plt. */ -}; - -/* The first entry in a PIC procedure linkage table look like this. - Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */ - -static const bfd_byte elf_i386_pic_plt0_entry[12] = -{ - 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */ - 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */ -}; - -/* Subsequent entries in a PIC procedure linkage table look like this. */ - -static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] = -{ - 0xff, 0xa3, /* jmp *offset(%ebx) */ - 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ - 0x68, /* pushl immediate */ - 0, 0, 0, 0, /* replaced with offset into relocation table. */ - 0xe9, /* jmp relative */ - 0, 0, 0, 0 /* replaced with offset to start of .plt. */ -}; - -/* .eh_frame covering the .plt section. */ - -static const bfd_byte elf_i386_eh_frame_plt[] = -{ -#define PLT_CIE_LENGTH 20 -#define PLT_FDE_LENGTH 36 -#define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8 -#define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12 - PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ - 0, 0, 0, 0, /* CIE ID */ - 1, /* CIE version */ - 'z', 'R', 0, /* Augmentation string */ - 1, /* Code alignment factor */ - 0x7c, /* Data alignment factor */ - 8, /* Return address column */ - 1, /* Augmentation size */ - DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ - DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */ - DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */ - DW_CFA_nop, DW_CFA_nop, - - PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */ - PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ - 0, 0, 0, 0, /* R_386_PC32 .plt goes here */ - 0, 0, 0, 0, /* .plt size goes here */ - 0, /* Augmentation size */ - DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */ - DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */ - DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */ - DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */ - DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */ - 11, /* Block length */ - DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */ - DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */ - DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge, - DW_OP_lit2, DW_OP_shl, DW_OP_plus, - DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop -}; - -struct elf_i386_plt_layout -{ - /* The first entry in an absolute procedure linkage table looks like this. */ - const bfd_byte *plt0_entry; - unsigned int plt0_entry_size; - - /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */ - unsigned int plt0_got1_offset; - unsigned int plt0_got2_offset; - - /* Later entries in an absolute procedure linkage table look like this. */ - const bfd_byte *plt_entry; - unsigned int plt_entry_size; - - /* Offsets into plt_entry that are to be replaced with... */ - unsigned int plt_got_offset; /* ... address of this symbol in .got. */ - unsigned int plt_reloc_offset; /* ... offset into relocation table. */ - unsigned int plt_plt_offset; /* ... offset to start of .plt. */ - - /* Offset into plt_entry where the initial value of the GOT entry points. */ - unsigned int plt_lazy_offset; - - /* The first entry in a PIC procedure linkage table looks like this. */ - const bfd_byte *pic_plt0_entry; - - /* Subsequent entries in a PIC procedure linkage table look like this. */ - const bfd_byte *pic_plt_entry; - - /* .eh_frame covering the .plt section. */ - const bfd_byte *eh_frame_plt; - unsigned int eh_frame_plt_size; -}; - -#define GET_PLT_ENTRY_SIZE(abfd) \ - get_elf_i386_backend_data (abfd)->plt->plt_entry_size - -/* These are the standard parameters. */ -static const struct elf_i386_plt_layout elf_i386_plt = - { - elf_i386_plt0_entry, /* plt0_entry */ - sizeof (elf_i386_plt0_entry), /* plt0_entry_size */ - 2, /* plt0_got1_offset */ - 8, /* plt0_got2_offset */ - elf_i386_plt_entry, /* plt_entry */ - PLT_ENTRY_SIZE, /* plt_entry_size */ - 2, /* plt_got_offset */ - 7, /* plt_reloc_offset */ - 12, /* plt_plt_offset */ - 6, /* plt_lazy_offset */ - elf_i386_pic_plt0_entry, /* pic_plt0_entry */ - elf_i386_pic_plt_entry, /* pic_plt_entry */ - elf_i386_eh_frame_plt, /* eh_frame_plt */ - sizeof (elf_i386_eh_frame_plt), /* eh_frame_plt_size */ - }; - - -/* On VxWorks, the .rel.plt.unloaded section has absolute relocations - for the PLTResolve stub and then for each PLT entry. */ -#define PLTRESOLVE_RELOCS_SHLIB 0 -#define PLTRESOLVE_RELOCS 2 -#define PLT_NON_JUMP_SLOT_RELOCS 2 - -/* Architecture-specific backend data for i386. */ - -struct elf_i386_backend_data -{ - /* Parameters describing PLT generation. */ - const struct elf_i386_plt_layout *plt; - - /* Value used to fill the unused bytes of the first PLT entry. */ - bfd_byte plt0_pad_byte; - - /* True if the target system is VxWorks. */ - int is_vxworks; -}; - -#define get_elf_i386_backend_data(abfd) \ - ((const struct elf_i386_backend_data *) \ - get_elf_backend_data (abfd)->arch_data) - -/* These are the standard parameters. */ -static const struct elf_i386_backend_data elf_i386_arch_bed = - { - &elf_i386_plt, /* plt */ - 0, /* plt0_pad_byte */ - 0, /* is_vxworks */ - }; - -#define elf_backend_arch_data &elf_i386_arch_bed - -/* i386 ELF linker hash entry. */ - -struct elf_i386_link_hash_entry -{ - struct elf_link_hash_entry elf; - - /* Track dynamic relocs copied for this symbol. */ - struct elf_dyn_relocs *dyn_relocs; - -#define GOT_UNKNOWN 0 -#define GOT_NORMAL 1 -#define GOT_TLS_GD 2 -#define GOT_TLS_IE 4 -#define GOT_TLS_IE_POS 5 -#define GOT_TLS_IE_NEG 6 -#define GOT_TLS_IE_BOTH 7 -#define GOT_TLS_GDESC 8 -#define GOT_TLS_GD_BOTH_P(type) \ - ((type) == (GOT_TLS_GD | GOT_TLS_GDESC)) -#define GOT_TLS_GD_P(type) \ - ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type)) -#define GOT_TLS_GDESC_P(type) \ - ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type)) -#define GOT_TLS_GD_ANY_P(type) \ - (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type)) - unsigned char tls_type; - - /* Offset of the GOTPLT entry reserved for the TLS descriptor, - starting at the end of the jump table. */ - bfd_vma tlsdesc_got; -}; - -#define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent)) - -struct elf_i386_obj_tdata -{ - struct elf_obj_tdata root; - - /* tls_type for each local got entry. */ - char *local_got_tls_type; - - /* GOTPLT entries for TLS descriptors. */ - bfd_vma *local_tlsdesc_gotent; -}; - -#define elf_i386_tdata(abfd) \ - ((struct elf_i386_obj_tdata *) (abfd)->tdata.any) - -#define elf_i386_local_got_tls_type(abfd) \ - (elf_i386_tdata (abfd)->local_got_tls_type) - -#define elf_i386_local_tlsdesc_gotent(abfd) \ - (elf_i386_tdata (abfd)->local_tlsdesc_gotent) - -#define is_i386_elf(bfd) \ - (bfd_get_flavour (bfd) == bfd_target_elf_flavour \ - && elf_tdata (bfd) != NULL \ - && elf_object_id (bfd) == I386_ELF_DATA) - -static bfd_boolean -elf_i386_mkobject (bfd *abfd) -{ - return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata), - I386_ELF_DATA); -} - -/* i386 ELF linker hash table. */ - -struct elf_i386_link_hash_table -{ - struct elf_link_hash_table elf; - - /* Short-cuts to get to dynamic linker sections. */ - asection *sdynbss; - asection *srelbss; - asection *plt_eh_frame; - - union - { - bfd_signed_vma refcount; - bfd_vma offset; - } tls_ldm_got; - - /* The amount of space used by the reserved portion of the sgotplt - section, plus whatever space is used by the jump slots. */ - bfd_vma sgotplt_jump_table_size; - - /* Small local sym cache. */ - struct sym_cache sym_cache; - - /* _TLS_MODULE_BASE_ symbol. */ - struct bfd_link_hash_entry *tls_module_base; - - /* Used by local STT_GNU_IFUNC symbols. */ - htab_t loc_hash_table; - void * loc_hash_memory; - - /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */ - asection *srelplt2; - - /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */ - bfd_vma next_tls_desc_index; - - /* The index of the next unused R_386_JUMP_SLOT slot in .rel.plt. */ - bfd_vma next_jump_slot_index; - - /* The index of the next unused R_386_IRELATIVE slot in .rel.plt. */ - bfd_vma next_irelative_index; -}; - -/* Get the i386 ELF linker hash table from a link_info structure. */ - -#define elf_i386_hash_table(p) \ - (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \ - == I386_ELF_DATA ? ((struct elf_i386_link_hash_table *) ((p)->hash)) : NULL) - -#define elf_i386_compute_jump_table_size(htab) \ - ((htab)->next_tls_desc_index * 4) - -/* Create an entry in an i386 ELF linker hash table. */ - -static struct bfd_hash_entry * -elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry, - struct bfd_hash_table *table, - const char *string) -{ - /* Allocate the structure if it has not already been allocated by a - subclass. */ - if (entry == NULL) - { - entry = (struct bfd_hash_entry *) - bfd_hash_allocate (table, sizeof (struct elf_i386_link_hash_entry)); - if (entry == NULL) - return entry; - } - - /* Call the allocation method of the superclass. */ - entry = _bfd_elf_link_hash_newfunc (entry, table, string); - if (entry != NULL) - { - struct elf_i386_link_hash_entry *eh; - - eh = (struct elf_i386_link_hash_entry *) entry; - eh->dyn_relocs = NULL; - eh->tls_type = GOT_UNKNOWN; - eh->tlsdesc_got = (bfd_vma) -1; - } - - return entry; -} - -/* Compute a hash of a local hash entry. We use elf_link_hash_entry - for local symbol so that we can handle local STT_GNU_IFUNC symbols - as global symbol. We reuse indx and dynstr_index for local symbol - hash since they aren't used by global symbols in this backend. */ - -static hashval_t -elf_i386_local_htab_hash (const void *ptr) -{ - struct elf_link_hash_entry *h - = (struct elf_link_hash_entry *) ptr; - return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index); -} - -/* Compare local hash entries. */ - -static int -elf_i386_local_htab_eq (const void *ptr1, const void *ptr2) -{ - struct elf_link_hash_entry *h1 - = (struct elf_link_hash_entry *) ptr1; - struct elf_link_hash_entry *h2 - = (struct elf_link_hash_entry *) ptr2; - - return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index; -} - -/* Find and/or create a hash entry for local symbol. */ - -static struct elf_link_hash_entry * -elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab, - bfd *abfd, const Elf_Internal_Rela *rel, - bfd_boolean create) -{ - struct elf_i386_link_hash_entry e, *ret; - asection *sec = abfd->sections; - hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id, - ELF32_R_SYM (rel->r_info)); - void **slot; - - e.elf.indx = sec->id; - e.elf.dynstr_index = ELF32_R_SYM (rel->r_info); - slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h, - create ? INSERT : NO_INSERT); - - if (!slot) - return NULL; - - if (*slot) - { - ret = (struct elf_i386_link_hash_entry *) *slot; - return &ret->elf; - } - - ret = (struct elf_i386_link_hash_entry *) - objalloc_alloc ((struct objalloc *) htab->loc_hash_memory, - sizeof (struct elf_i386_link_hash_entry)); - if (ret) - { - memset (ret, 0, sizeof (*ret)); - ret->elf.indx = sec->id; - ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info); - ret->elf.dynindx = -1; - *slot = ret; - } - return &ret->elf; -} - -/* Create an i386 ELF linker hash table. */ - -static struct bfd_link_hash_table * -elf_i386_link_hash_table_create (bfd *abfd) -{ - struct elf_i386_link_hash_table *ret; - bfd_size_type amt = sizeof (struct elf_i386_link_hash_table); - - ret = (struct elf_i386_link_hash_table *) bfd_zmalloc (amt); - if (ret == NULL) - return NULL; - - if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, - elf_i386_link_hash_newfunc, - sizeof (struct elf_i386_link_hash_entry), - I386_ELF_DATA)) - { - free (ret); - return NULL; - } - - ret->loc_hash_table = htab_try_create (1024, - elf_i386_local_htab_hash, - elf_i386_local_htab_eq, - NULL); - ret->loc_hash_memory = objalloc_create (); - if (!ret->loc_hash_table || !ret->loc_hash_memory) - { - free (ret); - return NULL; - } - - return &ret->elf.root; -} - -/* Destroy an i386 ELF linker hash table. */ - -static void -elf_i386_link_hash_table_free (struct bfd_link_hash_table *hash) -{ - struct elf_i386_link_hash_table *htab - = (struct elf_i386_link_hash_table *) hash; - - if (htab->loc_hash_table) - htab_delete (htab->loc_hash_table); - if (htab->loc_hash_memory) - objalloc_free ((struct objalloc *) htab->loc_hash_memory); - _bfd_elf_link_hash_table_free (hash); -} - -/* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and - .rel.bss sections in DYNOBJ, and set up shortcuts to them in our - hash table. */ - -static bfd_boolean -elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info) -{ - struct elf_i386_link_hash_table *htab; - - if (!_bfd_elf_create_dynamic_sections (dynobj, info)) - return FALSE; - - htab = elf_i386_hash_table (info); - if (htab == NULL) - return FALSE; - - htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss"); - if (!info->shared) - htab->srelbss = bfd_get_linker_section (dynobj, ".rel.bss"); - - if (!htab->sdynbss - || (!info->shared && !htab->srelbss)) - abort (); - - if (get_elf_i386_backend_data (dynobj)->is_vxworks - && !elf_vxworks_create_dynamic_sections (dynobj, info, - &htab->srelplt2)) - return FALSE; - - if (!info->no_ld_generated_unwind_info - && htab->plt_eh_frame == NULL - && htab->elf.splt != NULL) - { - flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY - | SEC_HAS_CONTENTS | SEC_IN_MEMORY - | SEC_LINKER_CREATED); - htab->plt_eh_frame - = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags); - if (htab->plt_eh_frame == NULL - || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 2)) - return FALSE; - } - - return TRUE; -} - -/* Copy the extra info we tack onto an elf_link_hash_entry. */ - -static void -elf_i386_copy_indirect_symbol (struct bfd_link_info *info, - struct elf_link_hash_entry *dir, - struct elf_link_hash_entry *ind) -{ - struct elf_i386_link_hash_entry *edir, *eind; - - edir = (struct elf_i386_link_hash_entry *) dir; - eind = (struct elf_i386_link_hash_entry *) ind; - - if (eind->dyn_relocs != NULL) - { - if (edir->dyn_relocs != NULL) - { - struct elf_dyn_relocs **pp; - struct elf_dyn_relocs *p; - - /* Add reloc counts against the indirect sym to the direct sym - list. Merge any entries against the same section. */ - for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) - { - struct elf_dyn_relocs *q; - - for (q = edir->dyn_relocs; q != NULL; q = q->next) - if (q->sec == p->sec) - { - q->pc_count += p->pc_count; - q->count += p->count; - *pp = p->next; - break; - } - if (q == NULL) - pp = &p->next; - } - *pp = edir->dyn_relocs; - } - - edir->dyn_relocs = eind->dyn_relocs; - eind->dyn_relocs = NULL; - } - - if (ind->root.type == bfd_link_hash_indirect - && dir->got.refcount <= 0) - { - edir->tls_type = eind->tls_type; - eind->tls_type = GOT_UNKNOWN; - } - - if (ELIMINATE_COPY_RELOCS - && ind->root.type != bfd_link_hash_indirect - && dir->dynamic_adjusted) - { - /* If called to transfer flags for a weakdef during processing - of elf_adjust_dynamic_symbol, don't copy non_got_ref. - We clear it ourselves for ELIMINATE_COPY_RELOCS. */ - dir->ref_dynamic |= ind->ref_dynamic; - dir->ref_regular |= ind->ref_regular; - dir->ref_regular_nonweak |= ind->ref_regular_nonweak; - dir->needs_plt |= ind->needs_plt; - dir->pointer_equality_needed |= ind->pointer_equality_needed; - } - else - _bfd_elf_link_hash_copy_indirect (info, dir, ind); -} - -/* Return TRUE if the TLS access code sequence support transition - from R_TYPE. */ - -static bfd_boolean -elf_i386_check_tls_transition (bfd *abfd, asection *sec, - bfd_byte *contents, - Elf_Internal_Shdr *symtab_hdr, - struct elf_link_hash_entry **sym_hashes, - unsigned int r_type, - const Elf_Internal_Rela *rel, - const Elf_Internal_Rela *relend) -{ - unsigned int val, type; - unsigned long r_symndx; - struct elf_link_hash_entry *h; - bfd_vma offset; - - /* Get the section contents. */ - if (contents == NULL) - { - if (elf_section_data (sec)->this_hdr.contents != NULL) - contents = elf_section_data (sec)->this_hdr.contents; - else - { - /* FIXME: How to better handle error condition? */ - if (!bfd_malloc_and_get_section (abfd, sec, &contents)) - return FALSE; - - /* Cache the section contents for elf_link_input_bfd. */ - elf_section_data (sec)->this_hdr.contents = contents; - } - } - - offset = rel->r_offset; - switch (r_type) - { - case R_386_TLS_GD: - case R_386_TLS_LDM: - if (offset < 2 || (rel + 1) >= relend) - return FALSE; - - type = bfd_get_8 (abfd, contents + offset - 2); - if (r_type == R_386_TLS_GD) - { - /* Check transition from GD access model. Only - leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr - leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop - can transit to different access model. */ - if ((offset + 10) > sec->size || - (type != 0x8d && type != 0x04)) - return FALSE; - - val = bfd_get_8 (abfd, contents + offset - 1); - if (type == 0x04) - { - /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */ - if (offset < 3) - return FALSE; - - if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d) - return FALSE; - - if ((val & 0xc7) != 0x05 || val == (4 << 3)) - return FALSE; - } - else - { - /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */ - if ((val & 0xf8) != 0x80 || (val & 7) == 4) - return FALSE; - - if (bfd_get_8 (abfd, contents + offset + 9) != 0x90) - return FALSE; - } - } - else - { - /* Check transition from LD access model. Only - leal foo@tlsgd(%reg), %eax; call ___tls_get_addr - can transit to different access model. */ - if (type != 0x8d || (offset + 9) > sec->size) - return FALSE; - - val = bfd_get_8 (abfd, contents + offset - 1); - if ((val & 0xf8) != 0x80 || (val & 7) == 4) - return FALSE; - } - - if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8) - return FALSE; - - r_symndx = ELF32_R_SYM (rel[1].r_info); - if (r_symndx < symtab_hdr->sh_info) - return FALSE; - - h = sym_hashes[r_symndx - symtab_hdr->sh_info]; - /* Use strncmp to check ___tls_get_addr since ___tls_get_addr - may be versioned. */ - return (h != NULL - && h->root.root.string != NULL - && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32 - || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32) - && (strncmp (h->root.root.string, "___tls_get_addr", - 15) == 0)); - - case R_386_TLS_IE: - /* Check transition from IE access model: - movl foo@indntpoff(%rip), %eax - movl foo@indntpoff(%rip), %reg - addl foo@indntpoff(%rip), %reg - */ - - if (offset < 1 || (offset + 4) > sec->size) - return FALSE; - - /* Check "movl foo@tpoff(%rip), %eax" first. */ - val = bfd_get_8 (abfd, contents + offset - 1); - if (val == 0xa1) - return TRUE; - - if (offset < 2) - return FALSE; - - /* Check movl|addl foo@tpoff(%rip), %reg. */ - type = bfd_get_8 (abfd, contents + offset - 2); - return ((type == 0x8b || type == 0x03) - && (val & 0xc7) == 0x05); - - case R_386_TLS_GOTIE: - case R_386_TLS_IE_32: - /* Check transition from {IE_32,GOTIE} access model: - subl foo@{tpoff,gontoff}(%reg1), %reg2 - movl foo@{tpoff,gontoff}(%reg1), %reg2 - addl foo@{tpoff,gontoff}(%reg1), %reg2 - */ - - if (offset < 2 || (offset + 4) > sec->size) - return FALSE; - - val = bfd_get_8 (abfd, contents + offset - 1); - if ((val & 0xc0) != 0x80 || (val & 7) == 4) - return FALSE; - - type = bfd_get_8 (abfd, contents + offset - 2); - return type == 0x8b || type == 0x2b || type == 0x03; - - case R_386_TLS_GOTDESC: - /* Check transition from GDesc access model: - leal x@tlsdesc(%ebx), %eax - - Make sure it's a leal adding ebx to a 32-bit offset - into any register, although it's probably almost always - going to be eax. */ - - if (offset < 2 || (offset + 4) > sec->size) - return FALSE; - - if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d) - return FALSE; - - val = bfd_get_8 (abfd, contents + offset - 1); - return (val & 0xc7) == 0x83; - - case R_386_TLS_DESC_CALL: - /* Check transition from GDesc access model: - call *x@tlsdesc(%rax) - */ - if (offset + 2 <= sec->size) - { - /* Make sure that it's a call *x@tlsdesc(%rax). */ - static const unsigned char call[] = { 0xff, 0x10 }; - return memcmp (contents + offset, call, 2) == 0; - } - - return FALSE; - - default: - abort (); - } -} - -/* Return TRUE if the TLS access transition is OK or no transition - will be performed. Update R_TYPE if there is a transition. */ - -static bfd_boolean -elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd, - asection *sec, bfd_byte *contents, - Elf_Internal_Shdr *symtab_hdr, - struct elf_link_hash_entry **sym_hashes, - unsigned int *r_type, int tls_type, - const Elf_Internal_Rela *rel, - const Elf_Internal_Rela *relend, - struct elf_link_hash_entry *h, - unsigned long r_symndx) -{ - unsigned int from_type = *r_type; - unsigned int to_type = from_type; - bfd_boolean check = TRUE; - - /* Skip TLS transition for functions. */ - if (h != NULL - && (h->type == STT_FUNC - || h->type == STT_GNU_IFUNC)) - return TRUE; - - switch (from_type) - { - case R_386_TLS_GD: - case R_386_TLS_GOTDESC: - case R_386_TLS_DESC_CALL: - case R_386_TLS_IE_32: - case R_386_TLS_IE: - case R_386_TLS_GOTIE: - if (info->executable) - { - if (h == NULL) - to_type = R_386_TLS_LE_32; - else if (from_type != R_386_TLS_IE - && from_type != R_386_TLS_GOTIE) - to_type = R_386_TLS_IE_32; - } - - /* When we are called from elf_i386_relocate_section, CONTENTS - isn't NULL and there may be additional transitions based on - TLS_TYPE. */ - if (contents != NULL) - { - unsigned int new_to_type = to_type; - - if (info->executable - && h != NULL - && h->dynindx == -1 - && (tls_type & GOT_TLS_IE)) - new_to_type = R_386_TLS_LE_32; - - if (to_type == R_386_TLS_GD - || to_type == R_386_TLS_GOTDESC - || to_type == R_386_TLS_DESC_CALL) - { - if (tls_type == GOT_TLS_IE_POS) - new_to_type = R_386_TLS_GOTIE; - else if (tls_type & GOT_TLS_IE) - new_to_type = R_386_TLS_IE_32; - } - - /* We checked the transition before when we were called from - elf_i386_check_relocs. We only want to check the new - transition which hasn't been checked before. */ - check = new_to_type != to_type && from_type == to_type; - to_type = new_to_type; - } - - break; - - case R_386_TLS_LDM: - if (info->executable) - to_type = R_386_TLS_LE_32; - break; - - default: - return TRUE; - } - - /* Return TRUE if there is no transition. */ - if (from_type == to_type) - return TRUE; - - /* Check if the transition can be performed. */ - if (check - && ! elf_i386_check_tls_transition (abfd, sec, contents, - symtab_hdr, sym_hashes, - from_type, rel, relend)) - { - reloc_howto_type *from, *to; - const char *name; - - from = elf_i386_rtype_to_howto (abfd, from_type); - to = elf_i386_rtype_to_howto (abfd, to_type); - - if (h) - name = h->root.root.string; - else - { - struct elf_i386_link_hash_table *htab; - - htab = elf_i386_hash_table (info); - if (htab == NULL) - name = "*unknown*"; - else - { - Elf_Internal_Sym *isym; - - isym = bfd_sym_from_r_symndx (&htab->sym_cache, - abfd, r_symndx); - name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL); - } - } - - (*_bfd_error_handler) - (_("%B: TLS transition from %s to %s against `%s' at 0x%lx " - "in section `%A' failed"), - abfd, sec, from->name, to->name, name, - (unsigned long) rel->r_offset); - bfd_set_error (bfd_error_bad_value); - return FALSE; - } - - *r_type = to_type; - return TRUE; -} - -/* Look through the relocs for a section during the first phase, and - calculate needed space in the global offset table, procedure linkage - table, and dynamic reloc sections. */ - -static bfd_boolean -elf_i386_check_relocs (bfd *abfd, - struct bfd_link_info *info, - asection *sec, - const Elf_Internal_Rela *relocs) -{ - struct elf_i386_link_hash_table *htab; - Elf_Internal_Shdr *symtab_hdr; - struct elf_link_hash_entry **sym_hashes; - const Elf_Internal_Rela *rel; - const Elf_Internal_Rela *rel_end; - asection *sreloc; - - if (info->relocatable) - return TRUE; - - BFD_ASSERT (is_i386_elf (abfd)); - - htab = elf_i386_hash_table (info); - if (htab == NULL) - return FALSE; - - symtab_hdr = &elf_symtab_hdr (abfd); - sym_hashes = elf_sym_hashes (abfd); - - sreloc = NULL; - - rel_end = relocs + sec->reloc_count; - for (rel = relocs; rel < rel_end; rel++) - { - unsigned int r_type; - unsigned long r_symndx; - struct elf_link_hash_entry *h; - Elf_Internal_Sym *isym; - const char *name; - bfd_boolean size_reloc; - - r_symndx = ELF32_R_SYM (rel->r_info); - r_type = ELF32_R_TYPE (rel->r_info); - - if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) - { - (*_bfd_error_handler) (_("%B: bad symbol index: %d"), - abfd, - r_symndx); - return FALSE; - } - - if (r_symndx < symtab_hdr->sh_info) - { - /* A local symbol. */ - isym = bfd_sym_from_r_symndx (&htab->sym_cache, - abfd, r_symndx); - if (isym == NULL) - return FALSE; - - /* Check relocation against local STT_GNU_IFUNC symbol. */ - if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) - { - h = elf_i386_get_local_sym_hash (htab, abfd, rel, TRUE); - if (h == NULL) - return FALSE; - - /* Fake a STT_GNU_IFUNC symbol. */ - h->type = STT_GNU_IFUNC; - h->def_regular = 1; - h->ref_regular = 1; - h->forced_local = 1; - h->root.type = bfd_link_hash_defined; - } - else - h = NULL; - } - else - { - isym = NULL; - h = sym_hashes[r_symndx - symtab_hdr->sh_info]; - while (h->root.type == bfd_link_hash_indirect - || h->root.type == bfd_link_hash_warning) - h = (struct elf_link_hash_entry *) h->root.u.i.link; - } - - if (h != NULL) - { - /* Create the ifunc sections for static executables. If we - never see an indirect function symbol nor we are building - a static executable, those sections will be empty and - won't appear in output. */ - switch (r_type) - { - default: - break; - - case R_386_32: - case R_386_PC32: - case R_386_PLT32: - case R_386_GOT32: - case R_386_GOTOFF: - if (htab->elf.dynobj == NULL) - htab->elf.dynobj = abfd; - if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info)) - return FALSE; - break; - } - - /* It is referenced by a non-shared object. */ - h->ref_regular = 1; - h->root.non_ir_ref = 1; - } - - if (! elf_i386_tls_transition (info, abfd, sec, NULL, - symtab_hdr, sym_hashes, - &r_type, GOT_UNKNOWN, - rel, rel_end, h, r_symndx)) - return FALSE; - - switch (r_type) - { - case R_386_TLS_LDM: - htab->tls_ldm_got.refcount += 1; - goto create_got; - - case R_386_PLT32: - /* This symbol requires a procedure linkage table entry. We - actually build the entry in adjust_dynamic_symbol, - because this might be a case of linking PIC code which is - never referenced by a dynamic object, in which case we - don't need to generate a procedure linkage table entry - after all. */ - - /* If this is a local symbol, we resolve it directly without - creating a procedure linkage table entry. */ - if (h == NULL) - continue; - - h->needs_plt = 1; - h->plt.refcount += 1; - break; - - case R_386_SIZE32: - size_reloc = TRUE; - goto do_size; - - case R_386_TLS_IE_32: - case R_386_TLS_IE: - case R_386_TLS_GOTIE: - if (!info->executable) - info->flags |= DF_STATIC_TLS; - /* Fall through */ - - case R_386_GOT32: - case R_386_TLS_GD: - case R_386_TLS_GOTDESC: - case R_386_TLS_DESC_CALL: - /* This symbol requires a global offset table entry. */ - { - int tls_type, old_tls_type; - - switch (r_type) - { - default: - case R_386_GOT32: tls_type = GOT_NORMAL; break; - case R_386_TLS_GD: tls_type = GOT_TLS_GD; break; - case R_386_TLS_GOTDESC: - case R_386_TLS_DESC_CALL: - tls_type = GOT_TLS_GDESC; break; - case R_386_TLS_IE_32: - if (ELF32_R_TYPE (rel->r_info) == r_type) - tls_type = GOT_TLS_IE_NEG; - else - /* If this is a GD->IE transition, we may use either of - R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */ - tls_type = GOT_TLS_IE; - break; - case R_386_TLS_IE: - case R_386_TLS_GOTIE: - tls_type = GOT_TLS_IE_POS; break; - } - - if (h != NULL) - { - h->got.refcount += 1; - old_tls_type = elf_i386_hash_entry(h)->tls_type; - } - else - { - bfd_signed_vma *local_got_refcounts; - - /* This is a global offset table entry for a local symbol. */ - local_got_refcounts = elf_local_got_refcounts (abfd); - if (local_got_refcounts == NULL) - { - bfd_size_type size; - - size = symtab_hdr->sh_info; - size *= (sizeof (bfd_signed_vma) - + sizeof (bfd_vma) + sizeof(char)); - local_got_refcounts = (bfd_signed_vma *) - bfd_zalloc (abfd, size); - if (local_got_refcounts == NULL) - return FALSE; - elf_local_got_refcounts (abfd) = local_got_refcounts; - elf_i386_local_tlsdesc_gotent (abfd) - = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info); - elf_i386_local_got_tls_type (abfd) - = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info); - } - local_got_refcounts[r_symndx] += 1; - old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx]; - } - - if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE)) - tls_type |= old_tls_type; - /* If a TLS symbol is accessed using IE at least once, - there is no point to use dynamic model for it. */ - else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN - && (! GOT_TLS_GD_ANY_P (old_tls_type) - || (tls_type & GOT_TLS_IE) == 0)) - { - if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type)) - tls_type = old_tls_type; - else if (GOT_TLS_GD_ANY_P (old_tls_type) - && GOT_TLS_GD_ANY_P (tls_type)) - tls_type |= old_tls_type; - else - { - if (h) - name = h->root.root.string; - else - name = bfd_elf_sym_name (abfd, symtab_hdr, isym, - NULL); - (*_bfd_error_handler) - (_("%B: `%s' accessed both as normal and " - "thread local symbol"), - abfd, name); - bfd_set_error (bfd_error_bad_value); - return FALSE; - } - } - - if (old_tls_type != tls_type) - { - if (h != NULL) - elf_i386_hash_entry (h)->tls_type = tls_type; - else - elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type; - } - } - /* Fall through */ - - case R_386_GOTOFF: - case R_386_GOTPC: - create_got: - if (htab->elf.sgot == NULL) - { - if (htab->elf.dynobj == NULL) - htab->elf.dynobj = abfd; - if (!_bfd_elf_create_got_section (htab->elf.dynobj, info)) - return FALSE; - } - if (r_type != R_386_TLS_IE) - break; - /* Fall through */ - - case R_386_TLS_LE_32: - case R_386_TLS_LE: - if (info->executable) - break; - info->flags |= DF_STATIC_TLS; - /* Fall through */ - - case R_386_32: - case R_386_PC32: - if (h != NULL && info->executable) - { - /* If this reloc is in a read-only section, we might - need a copy reloc. We can't check reliably at this - stage whether the section is read-only, as input - sections have not yet been mapped to output sections. - Tentatively set the flag for now, and correct in - adjust_dynamic_symbol. */ - h->non_got_ref = 1; - - /* We may need a .plt entry if the function this reloc - refers to is in a shared lib. */ - h->plt.refcount += 1; - if (r_type != R_386_PC32) - h->pointer_equality_needed = 1; - } - - size_reloc = FALSE; -do_size: - /* If we are creating a shared library, and this is a reloc - against a global symbol, or a non PC relative reloc - against a local symbol, then we need to copy the reloc - into the shared library. However, if we are linking with - -Bsymbolic, we do not need to copy a reloc against a - global symbol which is defined in an object we are - including in the link (i.e., DEF_REGULAR is set). At - this point we have not seen all the input files, so it is - possible that DEF_REGULAR is not set now but will be set - later (it is never cleared). In case of a weak definition, - DEF_REGULAR may be cleared later by a strong definition in - a shared library. We account for that possibility below by - storing information in the relocs_copied field of the hash - table entry. A similar situation occurs when creating - shared libraries and symbol visibility changes render the - symbol local. - - If on the other hand, we are creating an executable, we - may need to keep relocations for symbols satisfied by a - dynamic library if we manage to avoid copy relocs for the - symbol. */ - if ((info->shared - && (sec->flags & SEC_ALLOC) != 0 - && (r_type != R_386_PC32 - || (h != NULL - && (! SYMBOLIC_BIND (info, h) - || h->root.type == bfd_link_hash_defweak - || !h->def_regular)))) - || (ELIMINATE_COPY_RELOCS - && !info->shared - && (sec->flags & SEC_ALLOC) != 0 - && h != NULL - && (h->root.type == bfd_link_hash_defweak - || !h->def_regular))) - { - struct elf_dyn_relocs *p; - struct elf_dyn_relocs **head; - - /* We must copy these reloc types into the output file. - Create a reloc section in dynobj and make room for - this reloc. */ - if (sreloc == NULL) - { - if (htab->elf.dynobj == NULL) - htab->elf.dynobj = abfd; - - sreloc = _bfd_elf_make_dynamic_reloc_section - (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE); - - if (sreloc == NULL) - return FALSE; - } - - /* If this is a global symbol, we count the number of - relocations we need for this symbol. */ - if (h != NULL) - { - head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs; - } - else - { - /* Track dynamic relocs needed for local syms too. - We really need local syms available to do this - easily. Oh well. */ - void **vpp; - asection *s; - - isym = bfd_sym_from_r_symndx (&htab->sym_cache, - abfd, r_symndx); - if (isym == NULL) - return FALSE; - - s = bfd_section_from_elf_index (abfd, isym->st_shndx); - if (s == NULL) - s = sec; - - vpp = &elf_section_data (s)->local_dynrel; - head = (struct elf_dyn_relocs **)vpp; - } - - p = *head; - if (p == NULL || p->sec != sec) - { - bfd_size_type amt = sizeof *p; - p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj, - amt); - if (p == NULL) - return FALSE; - p->next = *head; - *head = p; - p->sec = sec; - p->count = 0; - p->pc_count = 0; - } - - p->count += 1; - /* Count size relocation as PC-relative relocation. */ - if (r_type == R_386_PC32 || size_reloc) - p->pc_count += 1; - } - break; - - /* This relocation describes the C++ object vtable hierarchy. - Reconstruct it for later use during GC. */ - case R_386_GNU_VTINHERIT: - if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) - return FALSE; - break; - - /* This relocation describes which C++ vtable entries are actually - used. Record for later use during GC. */ - case R_386_GNU_VTENTRY: - BFD_ASSERT (h != NULL); - if (h != NULL - && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset)) - return FALSE; - break; - - default: - break; - } - } - - return TRUE; -} - -/* Return the section that should be marked against GC for a given - relocation. */ - -static asection * -elf_i386_gc_mark_hook (asection *sec, - struct bfd_link_info *info, - Elf_Internal_Rela *rel, - struct elf_link_hash_entry *h, - Elf_Internal_Sym *sym) -{ - if (h != NULL) - switch (ELF32_R_TYPE (rel->r_info)) - { - case R_386_GNU_VTINHERIT: - case R_386_GNU_VTENTRY: - return NULL; - } - - return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); -} - -/* Update the got entry reference counts for the section being removed. */ - -static bfd_boolean -elf_i386_gc_sweep_hook (bfd *abfd, - struct bfd_link_info *info, - asection *sec, - const Elf_Internal_Rela *relocs) -{ - struct elf_i386_link_hash_table *htab; - Elf_Internal_Shdr *symtab_hdr; - struct elf_link_hash_entry **sym_hashes; - bfd_signed_vma *local_got_refcounts; - const Elf_Internal_Rela *rel, *relend; - - if (info->relocatable) - return TRUE; - - htab = elf_i386_hash_table (info); - if (htab == NULL) - return FALSE; - - elf_section_data (sec)->local_dynrel = NULL; - - symtab_hdr = &elf_symtab_hdr (abfd); - sym_hashes = elf_sym_hashes (abfd); - local_got_refcounts = elf_local_got_refcounts (abfd); - - relend = relocs + sec->reloc_count; - for (rel = relocs; rel < relend; rel++) - { - unsigned long r_symndx; - unsigned int r_type; - struct elf_link_hash_entry *h = NULL; - - r_symndx = ELF32_R_SYM (rel->r_info); - if (r_symndx >= symtab_hdr->sh_info) - { - h = sym_hashes[r_symndx - symtab_hdr->sh_info]; - while (h->root.type == bfd_link_hash_indirect - || h->root.type == bfd_link_hash_warning) - h = (struct elf_link_hash_entry *) h->root.u.i.link; - } - else - { - /* A local symbol. */ - Elf_Internal_Sym *isym; - - isym = bfd_sym_from_r_symndx (&htab->sym_cache, - abfd, r_symndx); - - /* Check relocation against local STT_GNU_IFUNC symbol. */ - if (isym != NULL - && ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) - { - h = elf_i386_get_local_sym_hash (htab, abfd, rel, FALSE); - if (h == NULL) - abort (); - } - } - - if (h) - { - struct elf_i386_link_hash_entry *eh; - struct elf_dyn_relocs **pp; - struct elf_dyn_relocs *p; - - eh = (struct elf_i386_link_hash_entry *) h; - for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) - if (p->sec == sec) - { - /* Everything must go for SEC. */ - *pp = p->next; - break; - } - } - - r_type = ELF32_R_TYPE (rel->r_info); - if (! elf_i386_tls_transition (info, abfd, sec, NULL, - symtab_hdr, sym_hashes, - &r_type, GOT_UNKNOWN, - rel, relend, h, r_symndx)) - return FALSE; - - switch (r_type) - { - case R_386_TLS_LDM: - if (htab->tls_ldm_got.refcount > 0) - htab->tls_ldm_got.refcount -= 1; - break; - - case R_386_TLS_GD: - case R_386_TLS_GOTDESC: - case R_386_TLS_DESC_CALL: - case R_386_TLS_IE_32: - case R_386_TLS_IE: - case R_386_TLS_GOTIE: - case R_386_GOT32: - if (h != NULL) - { - if (h->got.refcount > 0) - h->got.refcount -= 1; - if (h->type == STT_GNU_IFUNC) - { - if (h->plt.refcount > 0) - h->plt.refcount -= 1; - } - } - else if (local_got_refcounts != NULL) - { - if (local_got_refcounts[r_symndx] > 0) - local_got_refcounts[r_symndx] -= 1; - } - break; - - case R_386_32: - case R_386_PC32: - case R_386_SIZE32: - if (info->shared - && (h == NULL || h->type != STT_GNU_IFUNC)) - break; - /* Fall through */ - - case R_386_PLT32: - if (h != NULL) - { - if (h->plt.refcount > 0) - h->plt.refcount -= 1; - } - break; - - case R_386_GOTOFF: - if (h != NULL && h->type == STT_GNU_IFUNC) - { - if (h->got.refcount > 0) - h->got.refcount -= 1; - if (h->plt.refcount > 0) - h->plt.refcount -= 1; - } - break; - - default: - break; - } - } - - return TRUE; -} - -/* Adjust a symbol defined by a dynamic object and referenced by a - regular object. The current definition is in some section of the - dynamic object, but we're not including those sections. We have to - change the definition to something the rest of the link can - understand. */ - -static bfd_boolean -elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info, - struct elf_link_hash_entry *h) -{ - struct elf_i386_link_hash_table *htab; - asection *s; - struct elf_i386_link_hash_entry *eh; - struct elf_dyn_relocs *p; - - /* STT_GNU_IFUNC symbol must go through PLT. */ - if (h->type == STT_GNU_IFUNC) - { - /* All local STT_GNU_IFUNC references must be treate as local - calls via local PLT. */ - if (h->ref_regular - && SYMBOL_CALLS_LOCAL (info, h)) - { - bfd_size_type pc_count = 0, count = 0; - struct elf_dyn_relocs **pp; - - eh = (struct elf_i386_link_hash_entry *) h; - for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) - { - pc_count += p->pc_count; - p->count -= p->pc_count; - p->pc_count = 0; - count += p->count; - if (p->count == 0) - *pp = p->next; - else - pp = &p->next; - } - - if (pc_count || count) - { - h->needs_plt = 1; - h->non_got_ref = 1; - if (h->plt.refcount <= 0) - h->plt.refcount = 1; - else - h->plt.refcount += 1; - } - } - - if (h->plt.refcount <= 0) - { - h->plt.offset = (bfd_vma) -1; - h->needs_plt = 0; - } - return TRUE; - } - - /* If this is a function, put it in the procedure linkage table. We - will fill in the contents of the procedure linkage table later, - when we know the address of the .got section. */ - if (h->type == STT_FUNC - || h->needs_plt) - { - if (h->plt.refcount <= 0 - || SYMBOL_CALLS_LOCAL (info, h) - || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT - && h->root.type == bfd_link_hash_undefweak)) - { - /* This case can occur if we saw a PLT32 reloc in an input - file, but the symbol was never referred to by a dynamic - object, or if all references were garbage collected. In - such a case, we don't actually need to build a procedure - linkage table, and we can just do a PC32 reloc instead. */ - h->plt.offset = (bfd_vma) -1; - h->needs_plt = 0; - } - - return TRUE; - } - else - /* It's possible that we incorrectly decided a .plt reloc was - needed for an R_386_PC32 reloc to a non-function sym in - check_relocs. We can't decide accurately between function and - non-function syms in check-relocs; Objects loaded later in - the link may change h->type. So fix it now. */ - h->plt.offset = (bfd_vma) -1; - - /* If this is a weak symbol, and there is a real definition, the - processor independent code will have arranged for us to see the - real definition first, and we can just use the same value. */ - if (h->u.weakdef != NULL) - { - BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined - || h->u.weakdef->root.type == bfd_link_hash_defweak); - h->root.u.def.section = h->u.weakdef->root.u.def.section; - h->root.u.def.value = h->u.weakdef->root.u.def.value; - if (ELIMINATE_COPY_RELOCS || info->nocopyreloc) - h->non_got_ref = h->u.weakdef->non_got_ref; - return TRUE; - } - - /* This is a reference to a symbol defined by a dynamic object which - is not a function. */ - - /* If we are creating a shared library, we must presume that the - only references to the symbol are via the global offset table. - For such cases we need not do anything here; the relocations will - be handled correctly by relocate_section. */ - if (info->shared) - return TRUE; - - /* If there are no references to this symbol that do not use the - GOT, we don't need to generate a copy reloc. */ - if (!h->non_got_ref) - return TRUE; - - /* If -z nocopyreloc was given, we won't generate them either. */ - if (info->nocopyreloc) - { - h->non_got_ref = 0; - return TRUE; - } - - htab = elf_i386_hash_table (info); - if (htab == NULL) - return FALSE; - - /* If there aren't any dynamic relocs in read-only sections, then - we can keep the dynamic relocs and avoid the copy reloc. This - doesn't work on VxWorks, where we can not have dynamic relocations - (other than copy and jump slot relocations) in an executable. */ - if (ELIMINATE_COPY_RELOCS - && !get_elf_i386_backend_data (info->output_bfd)->is_vxworks) - { - eh = (struct elf_i386_link_hash_entry *) h; - for (p = eh->dyn_relocs; p != NULL; p = p->next) - { - s = p->sec->output_section; - if (s != NULL && (s->flags & SEC_READONLY) != 0) - break; - } - - if (p == NULL) - { - h->non_got_ref = 0; - return TRUE; - } - } - - /* We must allocate the symbol in our .dynbss section, which will - become part of the .bss section of the executable. There will be - an entry for this symbol in the .dynsym section. The dynamic - object will contain position independent code, so all references - from the dynamic object to this symbol will go through the global - offset table. The dynamic linker will use the .dynsym entry to - determine the address it must put in the global offset table, so - both the dynamic object and the regular object will refer to the - same memory location for the variable. */ - - /* We must generate a R_386_COPY reloc to tell the dynamic linker to - copy the initial value out of the dynamic object and into the - runtime process image. */ - if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) - { - htab->srelbss->size += sizeof (Elf32_External_Rel); - h->needs_copy = 1; - } - - s = htab->sdynbss; - - return _bfd_elf_adjust_dynamic_copy (h, s); -} - -/* Allocate space in .plt, .got and associated reloc sections for - dynamic relocs. */ - -static bfd_boolean -elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) -{ - struct bfd_link_info *info; - struct elf_i386_link_hash_table *htab; - struct elf_i386_link_hash_entry *eh; - struct elf_dyn_relocs *p; - unsigned plt_entry_size; - - if (h->root.type == bfd_link_hash_indirect) - return TRUE; - - eh = (struct elf_i386_link_hash_entry *) h; - - info = (struct bfd_link_info *) inf; - htab = elf_i386_hash_table (info); - if (htab == NULL) - return FALSE; - - plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd); - - /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it - here if it is defined and referenced in a non-shared object. */ - if (h->type == STT_GNU_IFUNC - && h->def_regular) - return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs, - plt_entry_size, - plt_entry_size, 4); - else if (htab->elf.dynamic_sections_created - && h->plt.refcount > 0) - { - /* Make sure this symbol is output as a dynamic symbol. - Undefined weak syms won't yet be marked as dynamic. */ - if (h->dynindx == -1 - && !h->forced_local) - { - if (! bfd_elf_link_record_dynamic_symbol (info, h)) - return FALSE; - } - - if (info->shared - || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) - { - asection *s = htab->elf.splt; - - /* If this is the first .plt entry, make room for the special - first entry. */ - if (s->size == 0) - s->size += plt_entry_size; - - h->plt.offset = s->size; - - /* If this symbol is not defined in a regular file, and we are - not generating a shared library, then set the symbol to this - location in the .plt. This is required to make function - pointers compare as equal between the normal executable and - the shared library. */ - if (! info->shared - && !h->def_regular) - { - h->root.u.def.section = s; - h->root.u.def.value = h->plt.offset; - } - - /* Make room for this entry. */ - s->size += plt_entry_size; - - /* We also need to make an entry in the .got.plt section, which - will be placed in the .got section by the linker script. */ - htab->elf.sgotplt->size += 4; - - /* We also need to make an entry in the .rel.plt section. */ - htab->elf.srelplt->size += sizeof (Elf32_External_Rel); - htab->elf.srelplt->reloc_count++; - - if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks - && !info->shared) - { - /* VxWorks has a second set of relocations for each PLT entry - in executables. They go in a separate relocation section, - which is processed by the kernel loader. */ - - /* There are two relocations for the initial PLT entry: an - R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an - R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */ - - if (h->plt.offset == plt_entry_size) - htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2); - - /* There are two extra relocations for each subsequent PLT entry: - an R_386_32 relocation for the GOT entry, and an R_386_32 - relocation for the PLT entry. */ - - htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2); - } - } - else - { - h->plt.offset = (bfd_vma) -1; - h->needs_plt = 0; - } - } - else - { - h->plt.offset = (bfd_vma) -1; - h->needs_plt = 0; - } - - eh->tlsdesc_got = (bfd_vma) -1; - - /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary, - make it a R_386_TLS_LE_32 requiring no TLS entry. */ - if (h->got.refcount > 0 - && info->executable - && h->dynindx == -1 - && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE)) - h->got.offset = (bfd_vma) -1; - else if (h->got.refcount > 0) - { - asection *s; - bfd_boolean dyn; - int tls_type = elf_i386_hash_entry(h)->tls_type; - - /* Make sure this symbol is output as a dynamic symbol. - Undefined weak syms won't yet be marked as dynamic. */ - if (h->dynindx == -1 - && !h->forced_local) - { - if (! bfd_elf_link_record_dynamic_symbol (info, h)) - return FALSE; - } - - s = htab->elf.sgot; - if (GOT_TLS_GDESC_P (tls_type)) - { - eh->tlsdesc_got = htab->elf.sgotplt->size - - elf_i386_compute_jump_table_size (htab); - htab->elf.sgotplt->size += 8; - h->got.offset = (bfd_vma) -2; - } - if (! GOT_TLS_GDESC_P (tls_type) - || GOT_TLS_GD_P (tls_type)) - { - h->got.offset = s->size; - s->size += 4; - /* R_386_TLS_GD needs 2 consecutive GOT slots. */ - if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH) - s->size += 4; - } - dyn = htab->elf.dynamic_sections_created; - /* R_386_TLS_IE_32 needs one dynamic relocation, - R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation, - (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we - need two), R_386_TLS_GD needs one if local symbol and two if - global. */ - if (tls_type == GOT_TLS_IE_BOTH) - htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel); - else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1) - || (tls_type & GOT_TLS_IE)) - htab->elf.srelgot->size += sizeof (Elf32_External_Rel); - else if (GOT_TLS_GD_P (tls_type)) - htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel); - else if (! GOT_TLS_GDESC_P (tls_type) - && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT - || h->root.type != bfd_link_hash_undefweak) - && (info->shared - || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) - htab->elf.srelgot->size += sizeof (Elf32_External_Rel); - if (GOT_TLS_GDESC_P (tls_type)) - htab->elf.srelplt->size += sizeof (Elf32_External_Rel); - } - else - h->got.offset = (bfd_vma) -1; - - if (eh->dyn_relocs == NULL) - return TRUE; - - /* In the shared -Bsymbolic case, discard space allocated for - dynamic pc-relative relocs against symbols which turn out to be - defined in regular objects. For the normal shared case, discard - space for pc-relative relocs that have become local due to symbol - visibility changes. */ - - if (info->shared) - { - /* The only reloc that uses pc_count is R_386_PC32, which will - appear on a call or on something like ".long foo - .". We - want calls to protected symbols to resolve directly to the - function rather than going via the plt. If people want - function pointer comparisons to work as expected then they - should avoid writing assembly like ".long foo - .". */ - if (SYMBOL_CALLS_LOCAL (info, h)) - { - struct elf_dyn_relocs **pp; - - for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) - { - p->count -= p->pc_count; - p->pc_count = 0; - if (p->count == 0) - *pp = p->next; - else - pp = &p->next; - } - } - - if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks) - { - struct elf_dyn_relocs **pp; - for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) - { - if (strcmp (p->sec->output_section->name, ".tls_vars") == 0) - *pp = p->next; - else - pp = &p->next; - } - } - - /* Also discard relocs on undefined weak syms with non-default - visibility. */ - if (eh->dyn_relocs != NULL - && h->root.type == bfd_link_hash_undefweak) - { - if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) - eh->dyn_relocs = NULL; - - /* Make sure undefined weak symbols are output as a dynamic - symbol in PIEs. */ - else if (h->dynindx == -1 - && !h->forced_local) - { - if (! bfd_elf_link_record_dynamic_symbol (info, h)) - return FALSE; - } - } - } - else if (ELIMINATE_COPY_RELOCS) - { - /* For the non-shared case, discard space for relocs against - symbols which turn out to need copy relocs or are not - dynamic. */ - - if (!h->non_got_ref - && ((h->def_dynamic - && !h->def_regular) - || (htab->elf.dynamic_sections_created - && (h->root.type == bfd_link_hash_undefweak - || h->root.type == bfd_link_hash_undefined)))) - { - /* Make sure this symbol is output as a dynamic symbol. - Undefined weak syms won't yet be marked as dynamic. */ - if (h->dynindx == -1 - && !h->forced_local) - { - if (! bfd_elf_link_record_dynamic_symbol (info, h)) - return FALSE; - } - - /* If that succeeded, we know we'll be keeping all the - relocs. */ - if (h->dynindx != -1) - goto keep; - } - - eh->dyn_relocs = NULL; - - keep: ; - } - - /* Finally, allocate space. */ - for (p = eh->dyn_relocs; p != NULL; p = p->next) - { - asection *sreloc; - - sreloc = elf_section_data (p->sec)->sreloc; - - BFD_ASSERT (sreloc != NULL); - sreloc->size += p->count * sizeof (Elf32_External_Rel); - } - - return TRUE; -} - -/* Allocate space in .plt, .got and associated reloc sections for - local dynamic relocs. */ - -static bfd_boolean -elf_i386_allocate_local_dynrelocs (void **slot, void *inf) -{ - struct elf_link_hash_entry *h - = (struct elf_link_hash_entry *) *slot; - - if (h->type != STT_GNU_IFUNC - || !h->def_regular - || !h->ref_regular - || !h->forced_local - || h->root.type != bfd_link_hash_defined) - abort (); - - return elf_i386_allocate_dynrelocs (h, inf); -} - -/* Find any dynamic relocs that apply to read-only sections. */ - -static bfd_boolean -elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf) -{ - struct elf_i386_link_hash_entry *eh; - struct elf_dyn_relocs *p; - - /* Skip local IFUNC symbols. */ - if (h->forced_local && h->type == STT_GNU_IFUNC) - return TRUE; - - eh = (struct elf_i386_link_hash_entry *) h; - for (p = eh->dyn_relocs; p != NULL; p = p->next) - { - asection *s = p->sec->output_section; - - if (s != NULL && (s->flags & SEC_READONLY) != 0) - { - struct bfd_link_info *info = (struct bfd_link_info *) inf; - - info->flags |= DF_TEXTREL; - - if (info->warn_shared_textrel && info->shared) - info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'.\n"), - p->sec->owner, h->root.root.string, - p->sec); - - /* Not an error, just cut short the traversal. */ - return FALSE; - } - } - return TRUE; -} - -/* Convert - mov foo@GOT(%reg), %reg - to - lea foo@GOTOFF(%reg), %reg - with the local symbol, foo. */ - -static bfd_boolean -elf_i386_convert_mov_to_lea (bfd *abfd, asection *sec, - struct bfd_link_info *link_info) -{ - Elf_Internal_Shdr *symtab_hdr; - Elf_Internal_Rela *internal_relocs; - Elf_Internal_Rela *irel, *irelend; - bfd_byte *contents; - struct elf_i386_link_hash_table *htab; - bfd_boolean changed_contents; - bfd_boolean changed_relocs; - bfd_signed_vma *local_got_refcounts; - - /* Don't even try to convert non-ELF outputs. */ - if (!is_elf_hash_table (link_info->hash)) - return FALSE; - - /* Nothing to do if there are no codes, no relocations or no output. */ - if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC) - || sec->reloc_count == 0 - || discarded_section (sec)) - return TRUE; - - symtab_hdr = &elf_tdata (abfd)->symtab_hdr; - - /* Load the relocations for this section. */ - internal_relocs = (_bfd_elf_link_read_relocs - (abfd, sec, NULL, (Elf_Internal_Rela *) NULL, - link_info->keep_memory)); - if (internal_relocs == NULL) - return FALSE; - - htab = elf_i386_hash_table (link_info); - changed_contents = FALSE; - changed_relocs = FALSE; - local_got_refcounts = elf_local_got_refcounts (abfd); - - /* Get the section contents. */ - if (elf_section_data (sec)->this_hdr.contents != NULL) - contents = elf_section_data (sec)->this_hdr.contents; - else - { - if (!bfd_malloc_and_get_section (abfd, sec, &contents)) - goto error_return; - } - - irelend = internal_relocs + sec->reloc_count; - for (irel = internal_relocs; irel < irelend; irel++) - { - unsigned int r_type = ELF32_R_TYPE (irel->r_info); - unsigned int r_symndx = ELF32_R_SYM (irel->r_info); - unsigned int indx; - struct elf_link_hash_entry *h; - - if (r_type != R_386_GOT32) - continue; - - /* Get the symbol referred to by the reloc. */ - if (r_symndx < symtab_hdr->sh_info) - { - Elf_Internal_Sym *isym; - - isym = bfd_sym_from_r_symndx (&htab->sym_cache, - abfd, r_symndx); - - /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. */ - if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC - && bfd_get_8 (input_bfd, - contents + irel->r_offset - 2) == 0x8b) - { - bfd_put_8 (output_bfd, 0x8d, - contents + irel->r_offset - 2); - irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF); - if (local_got_refcounts != NULL - && local_got_refcounts[r_symndx] > 0) - local_got_refcounts[r_symndx] -= 1; - changed_contents = TRUE; - changed_relocs = TRUE; - } - continue; - } - - indx = r_symndx - symtab_hdr->sh_info; - h = elf_sym_hashes (abfd)[indx]; - BFD_ASSERT (h != NULL); - - while (h->root.type == bfd_link_hash_indirect - || h->root.type == bfd_link_hash_warning) - h = (struct elf_link_hash_entry *) h->root.u.i.link; - - /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. We also avoid - optimizing _DYNAMIC since ld.so may use its link-time address. */ - if (h->def_regular - && h->type != STT_GNU_IFUNC - && h != htab->elf.hdynamic - && SYMBOL_REFERENCES_LOCAL (link_info, h) - && bfd_get_8 (input_bfd, - contents + irel->r_offset - 2) == 0x8b) - { - bfd_put_8 (output_bfd, 0x8d, - contents + irel->r_offset - 2); - irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF); - if (h->got.refcount > 0) - h->got.refcount -= 1; - changed_contents = TRUE; - changed_relocs = TRUE; - } - } - - if (contents != NULL - && elf_section_data (sec)->this_hdr.contents != contents) - { - if (!changed_contents && !link_info->keep_memory) - free (contents); - else - { - /* Cache the section contents for elf_link_input_bfd. */ - elf_section_data (sec)->this_hdr.contents = contents; - } - } - - if (elf_section_data (sec)->relocs != internal_relocs) - { - if (!changed_relocs) - free (internal_relocs); - else - elf_section_data (sec)->relocs = internal_relocs; - } - - return TRUE; - - error_return: - if (contents != NULL - && elf_section_data (sec)->this_hdr.contents != contents) - free (contents); - if (internal_relocs != NULL - && elf_section_data (sec)->relocs != internal_relocs) - free (internal_relocs); - return FALSE; -} - -/* Set the sizes of the dynamic sections. */ - -static bfd_boolean -elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) -{ - struct elf_i386_link_hash_table *htab; - bfd *dynobj; - asection *s; - bfd_boolean relocs; - bfd *ibfd; - - htab = elf_i386_hash_table (info); - if (htab == NULL) - return FALSE; - dynobj = htab->elf.dynobj; - if (dynobj == NULL) - abort (); - - if (htab->elf.dynamic_sections_created) - { - /* Set the contents of the .interp section to the interpreter. */ - if (info->executable) - { - s = bfd_get_linker_section (dynobj, ".interp"); - if (s == NULL) - abort (); - s->size = sizeof ELF_DYNAMIC_INTERPRETER; - s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; - } - } - - /* Set up .got offsets for local syms, and space for local dynamic - relocs. */ - for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) - { - bfd_signed_vma *local_got; - bfd_signed_vma *end_local_got; - char *local_tls_type; - bfd_vma *local_tlsdesc_gotent; - bfd_size_type locsymcount; - Elf_Internal_Shdr *symtab_hdr; - asection *srel; - - if (! is_i386_elf (ibfd)) - continue; - - for (s = ibfd->sections; s != NULL; s = s->next) - { - struct elf_dyn_relocs *p; - - if (!elf_i386_convert_mov_to_lea (ibfd, s, info)) - return FALSE; - - for (p = ((struct elf_dyn_relocs *) - elf_section_data (s)->local_dynrel); - p != NULL; - p = p->next) - { - if (!bfd_is_abs_section (p->sec) - && bfd_is_abs_section (p->sec->output_section)) - { - /* Input section has been discarded, either because - it is a copy of a linkonce section or due to - linker script /DISCARD/, so we'll be discarding - the relocs too. */ - } - else if (get_elf_i386_backend_data (output_bfd)->is_vxworks - && strcmp (p->sec->output_section->name, - ".tls_vars") == 0) - { - /* Relocations in vxworks .tls_vars sections are - handled specially by the loader. */ - } - else if (p->count != 0) - { - srel = elf_section_data (p->sec)->sreloc; - srel->size += p->count * sizeof (Elf32_External_Rel); - if ((p->sec->output_section->flags & SEC_READONLY) != 0 - && (info->flags & DF_TEXTREL) == 0) - { - info->flags |= DF_TEXTREL; - if (info->warn_shared_textrel && info->shared) - info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'.\n"), - p->sec->owner, p->sec); - } - } - } - } - - local_got = elf_local_got_refcounts (ibfd); - if (!local_got) - continue; - - symtab_hdr = &elf_symtab_hdr (ibfd); - locsymcount = symtab_hdr->sh_info; - end_local_got = local_got + locsymcount; - local_tls_type = elf_i386_local_got_tls_type (ibfd); - local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd); - s = htab->elf.sgot; - srel = htab->elf.srelgot; - for (; local_got < end_local_got; - ++local_got, ++local_tls_type, ++local_tlsdesc_gotent) - { - *local_tlsdesc_gotent = (bfd_vma) -1; - if (*local_got > 0) - { - if (GOT_TLS_GDESC_P (*local_tls_type)) - { - *local_tlsdesc_gotent = htab->elf.sgotplt->size - - elf_i386_compute_jump_table_size (htab); - htab->elf.sgotplt->size += 8; - *local_got = (bfd_vma) -2; - } - if (! GOT_TLS_GDESC_P (*local_tls_type) - || GOT_TLS_GD_P (*local_tls_type)) - { - *local_got = s->size; - s->size += 4; - if (GOT_TLS_GD_P (*local_tls_type) - || *local_tls_type == GOT_TLS_IE_BOTH) - s->size += 4; - } - if (info->shared - || GOT_TLS_GD_ANY_P (*local_tls_type) - || (*local_tls_type & GOT_TLS_IE)) - { - if (*local_tls_type == GOT_TLS_IE_BOTH) - srel->size += 2 * sizeof (Elf32_External_Rel); - else if (GOT_TLS_GD_P (*local_tls_type) - || ! GOT_TLS_GDESC_P (*local_tls_type)) - srel->size += sizeof (Elf32_External_Rel); - if (GOT_TLS_GDESC_P (*local_tls_type)) - htab->elf.srelplt->size += sizeof (Elf32_External_Rel); - } - } - else - *local_got = (bfd_vma) -1; - } - } - - if (htab->tls_ldm_got.refcount > 0) - { - /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM - relocs. */ - htab->tls_ldm_got.offset = htab->elf.sgot->size; - htab->elf.sgot->size += 8; - htab->elf.srelgot->size += sizeof (Elf32_External_Rel); - } - else - htab->tls_ldm_got.offset = -1; - - /* Allocate global sym .plt and .got entries, and space for global - sym dynamic relocs. */ - elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info); - - /* Allocate .plt and .got entries, and space for local symbols. */ - htab_traverse (htab->loc_hash_table, - elf_i386_allocate_local_dynrelocs, - info); - - /* For every jump slot reserved in the sgotplt, reloc_count is - incremented. However, when we reserve space for TLS descriptors, - it's not incremented, so in order to compute the space reserved - for them, it suffices to multiply the reloc count by the jump - slot size. - - PR ld/13302: We start next_irelative_index at the end of .rela.plt - so that R_386_IRELATIVE entries come last. */ - if (htab->elf.srelplt) - { - htab->next_tls_desc_index = htab->elf.srelplt->reloc_count; - htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4; - htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1; - } - else if (htab->elf.irelplt) - htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1; - - - if (htab->elf.sgotplt) - { - /* Don't allocate .got.plt section if there are no GOT nor PLT - entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */ - if ((htab->elf.hgot == NULL - || !htab->elf.hgot->ref_regular_nonweak) - && (htab->elf.sgotplt->size - == get_elf_backend_data (output_bfd)->got_header_size) - && (htab->elf.splt == NULL - || htab->elf.splt->size == 0) - && (htab->elf.sgot == NULL - || htab->elf.sgot->size == 0) - && (htab->elf.iplt == NULL - || htab->elf.iplt->size == 0) - && (htab->elf.igotplt == NULL - || htab->elf.igotplt->size == 0)) - htab->elf.sgotplt->size = 0; - } - - - if (htab->plt_eh_frame != NULL - && htab->elf.splt != NULL - && htab->elf.splt->size != 0 - && !bfd_is_abs_section (htab->elf.splt->output_section) - && _bfd_elf_eh_frame_present (info)) - htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt); - - /* We now have determined the sizes of the various dynamic sections. - Allocate memory for them. */ - relocs = FALSE; - for (s = dynobj->sections; s != NULL; s = s->next) - { - bfd_boolean strip_section = TRUE; - - if ((s->flags & SEC_LINKER_CREATED) == 0) - continue; - - if (s == htab->elf.splt - || s == htab->elf.sgot) - { - /* Strip this section if we don't need it; see the - comment below. */ - /* We'd like to strip these sections if they aren't needed, but if - we've exported dynamic symbols from them we must leave them. - It's too late to tell BFD to get rid of the symbols. */ - - if (htab->elf.hplt != NULL) - strip_section = FALSE; - } - else if (s == htab->elf.sgotplt - || s == htab->elf.iplt - || s == htab->elf.igotplt - || s == htab->plt_eh_frame - || s == htab->sdynbss) - { - /* Strip these too. */ - } - else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel")) - { - if (s->size != 0 - && s != htab->elf.srelplt - && s != htab->srelplt2) - relocs = TRUE; - - /* We use the reloc_count field as a counter if we need - to copy relocs into the output file. */ - s->reloc_count = 0; - } - else - { - /* It's not one of our sections, so don't allocate space. */ - continue; - } - - if (s->size == 0) - { - /* If we don't need this section, strip it from the - output file. This is mostly to handle .rel.bss and - .rel.plt. We must create both sections in - create_dynamic_sections, because they must be created - before the linker maps input sections to output - sections. The linker does that before - adjust_dynamic_symbol is called, and it is that - function which decides whether anything needs to go - into these sections. */ - if (strip_section) - s->flags |= SEC_EXCLUDE; - continue; - } - - if ((s->flags & SEC_HAS_CONTENTS) == 0) - continue; - - /* Allocate memory for the section contents. We use bfd_zalloc - here in case unused entries are not reclaimed before the - section's contents are written out. This should not happen, - but this way if it does, we get a R_386_NONE reloc instead - of garbage. */ - s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size); - if (s->contents == NULL) - return FALSE; - } - - if (htab->plt_eh_frame != NULL - && htab->plt_eh_frame->contents != NULL) - { - memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt, - sizeof (elf_i386_eh_frame_plt)); - bfd_put_32 (dynobj, htab->elf.splt->size, - htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET); - } - - if (htab->elf.dynamic_sections_created) - { - /* Add some entries to the .dynamic section. We fill in the - values later, in elf_i386_finish_dynamic_sections, but we - must add the entries now so that we get the correct size for - the .dynamic section. The DT_DEBUG entry is filled in by the - dynamic linker and used by the debugger. */ -#define add_dynamic_entry(TAG, VAL) \ - _bfd_elf_add_dynamic_entry (info, TAG, VAL) - - if (info->executable) - { - if (!add_dynamic_entry (DT_DEBUG, 0)) - return FALSE; - } - - if (htab->elf.splt->size != 0) - { - if (!add_dynamic_entry (DT_PLTGOT, 0) - || !add_dynamic_entry (DT_PLTRELSZ, 0) - || !add_dynamic_entry (DT_PLTREL, DT_REL) - || !add_dynamic_entry (DT_JMPREL, 0)) - return FALSE; - } - - if (relocs) - { - if (!add_dynamic_entry (DT_REL, 0) - || !add_dynamic_entry (DT_RELSZ, 0) - || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel))) - return FALSE; - - /* If any dynamic relocs apply to a read-only section, - then we need a DT_TEXTREL entry. */ - if ((info->flags & DF_TEXTREL) == 0) - elf_link_hash_traverse (&htab->elf, - elf_i386_readonly_dynrelocs, info); - - if ((info->flags & DF_TEXTREL) != 0) - { - if (!add_dynamic_entry (DT_TEXTREL, 0)) - return FALSE; - } - } - if (get_elf_i386_backend_data (output_bfd)->is_vxworks - && !elf_vxworks_add_dynamic_entries (output_bfd, info)) - return FALSE; - } -#undef add_dynamic_entry - - return TRUE; -} - -static bfd_boolean -elf_i386_always_size_sections (bfd *output_bfd, - struct bfd_link_info *info) -{ - asection *tls_sec = elf_hash_table (info)->tls_sec; - - if (tls_sec) - { - struct elf_link_hash_entry *tlsbase; - - tlsbase = elf_link_hash_lookup (elf_hash_table (info), - "_TLS_MODULE_BASE_", - FALSE, FALSE, FALSE); - - if (tlsbase && tlsbase->type == STT_TLS) - { - struct elf_i386_link_hash_table *htab; - struct bfd_link_hash_entry *bh = NULL; - const struct elf_backend_data *bed - = get_elf_backend_data (output_bfd); - - htab = elf_i386_hash_table (info); - if (htab == NULL) - return FALSE; - - if (!(_bfd_generic_link_add_one_symbol - (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL, - tls_sec, 0, NULL, FALSE, - bed->collect, &bh))) - return FALSE; - - htab->tls_module_base = bh; - - tlsbase = (struct elf_link_hash_entry *)bh; - tlsbase->def_regular = 1; - tlsbase->other = STV_HIDDEN; - (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE); - } - } - - return TRUE; -} - -/* Set the correct type for an x86 ELF section. We do this by the - section name, which is a hack, but ought to work. */ - -static bfd_boolean -elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED, - Elf_Internal_Shdr *hdr, - asection *sec) -{ - const char *name; - - name = bfd_get_section_name (abfd, sec); - - /* This is an ugly, but unfortunately necessary hack that is - needed when producing EFI binaries on x86. It tells - elf.c:elf_fake_sections() not to consider ".reloc" as a section - containing ELF relocation info. We need this hack in order to - be able to generate ELF binaries that can be translated into - EFI applications (which are essentially COFF objects). Those - files contain a COFF ".reloc" section inside an ELFNN object, - which would normally cause BFD to segfault because it would - attempt to interpret this section as containing relocation - entries for section "oc". With this hack enabled, ".reloc" - will be treated as a normal data section, which will avoid the - segfault. However, you won't be able to create an ELFNN binary - with a section named "oc" that needs relocations, but that's - the kind of ugly side-effects you get when detecting section - types based on their names... In practice, this limitation is - unlikely to bite. */ - if (strcmp (name, ".reloc") == 0) - hdr->sh_type = SHT_PROGBITS; - - return TRUE; -} - -/* _TLS_MODULE_BASE_ needs to be treated especially when linking - executables. Rather than setting it to the beginning of the TLS - section, we have to set it to the end. This function may be called - multiple times, it is idempotent. */ - -static void -elf_i386_set_tls_module_base (struct bfd_link_info *info) -{ - struct elf_i386_link_hash_table *htab; - struct bfd_link_hash_entry *base; - - if (!info->executable) - return; - - htab = elf_i386_hash_table (info); - if (htab == NULL) - return; - - base = htab->tls_module_base; - if (base == NULL) - return; - - base->u.def.value = htab->elf.tls_size; -} - -/* Return the base VMA address which should be subtracted from real addresses - when resolving @dtpoff relocation. - This is PT_TLS segment p_vaddr. */ - -static bfd_vma -elf_i386_dtpoff_base (struct bfd_link_info *info) -{ - /* If tls_sec is NULL, we should have signalled an error already. */ - if (elf_hash_table (info)->tls_sec == NULL) - return 0; - return elf_hash_table (info)->tls_sec->vma; -} - -/* Return the relocation value for @tpoff relocation - if STT_TLS virtual address is ADDRESS. */ - -static bfd_vma -elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address) -{ - struct elf_link_hash_table *htab = elf_hash_table (info); - const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd); - bfd_vma static_tls_size; - - /* If tls_sec is NULL, we should have signalled an error already. */ - if (htab->tls_sec == NULL) - return 0; - - /* Consider special static TLS alignment requirements. */ - static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment); - return static_tls_size + htab->tls_sec->vma - address; -} - -/* Relocate an i386 ELF section. */ - -static bfd_boolean -elf_i386_relocate_section (bfd *output_bfd, - struct bfd_link_info *info, - bfd *input_bfd, - asection *input_section, - bfd_byte *contents, - Elf_Internal_Rela *relocs, - Elf_Internal_Sym *local_syms, - asection **local_sections) -{ - struct elf_i386_link_hash_table *htab; - Elf_Internal_Shdr *symtab_hdr; - struct elf_link_hash_entry **sym_hashes; - bfd_vma *local_got_offsets; - bfd_vma *local_tlsdesc_gotents; - Elf_Internal_Rela *rel; - Elf_Internal_Rela *relend; - bfd_boolean is_vxworks_tls; - unsigned plt_entry_size; - - BFD_ASSERT (is_i386_elf (input_bfd)); - - htab = elf_i386_hash_table (info); - if (htab == NULL) - return FALSE; - symtab_hdr = &elf_symtab_hdr (input_bfd); - sym_hashes = elf_sym_hashes (input_bfd); - local_got_offsets = elf_local_got_offsets (input_bfd); - local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd); - /* We have to handle relocations in vxworks .tls_vars sections - specially, because the dynamic loader is 'weird'. */ - is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks - && info->shared - && !strcmp (input_section->output_section->name, - ".tls_vars")); - - elf_i386_set_tls_module_base (info); - - plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd); - - rel = relocs; - relend = relocs + input_section->reloc_count; - for (; rel < relend; rel++) - { - unsigned int r_type; - reloc_howto_type *howto; - unsigned long r_symndx; - struct elf_link_hash_entry *h; - Elf_Internal_Sym *sym; - asection *sec; - bfd_vma off, offplt; - bfd_vma relocation; - bfd_boolean unresolved_reloc; - bfd_reloc_status_type r; - unsigned int indx; - int tls_type; - bfd_vma st_size; - - r_type = ELF32_R_TYPE (rel->r_info); - if (r_type == R_386_GNU_VTINHERIT - || r_type == R_386_GNU_VTENTRY) - continue; - - if ((indx = r_type) >= R_386_standard - && ((indx = r_type - R_386_ext_offset) - R_386_standard - >= R_386_ext - R_386_standard) - && ((indx = r_type - R_386_tls_offset) - R_386_ext - >= R_386_irelative - R_386_ext)) - { - (*_bfd_error_handler) - (_("%B: unrecognized relocation (0x%x) in section `%A'"), - input_bfd, input_section, r_type); - bfd_set_error (bfd_error_bad_value); - return FALSE; - } - howto = elf_howto_table + indx; - - r_symndx = ELF32_R_SYM (rel->r_info); - h = NULL; - sym = NULL; - sec = NULL; - unresolved_reloc = FALSE; - if (r_symndx < symtab_hdr->sh_info) - { - sym = local_syms + r_symndx; - sec = local_sections[r_symndx]; - relocation = (sec->output_section->vma - + sec->output_offset - + sym->st_value); - st_size = sym->st_size; - - if (ELF_ST_TYPE (sym->st_info) == STT_SECTION - && ((sec->flags & SEC_MERGE) != 0 - || (info->relocatable - && sec->output_offset != 0))) - { - bfd_vma addend; - bfd_byte *where = contents + rel->r_offset; - - switch (howto->size) - { - case 0: - addend = bfd_get_8 (input_bfd, where); - if (howto->pc_relative) - { - addend = (addend ^ 0x80) - 0x80; - addend += 1; - } - break; - case 1: - addend = bfd_get_16 (input_bfd, where); - if (howto->pc_relative) - { - addend = (addend ^ 0x8000) - 0x8000; - addend += 2; - } - break; - case 2: - addend = bfd_get_32 (input_bfd, where); - if (howto->pc_relative) - { - addend = (addend ^ 0x80000000) - 0x80000000; - addend += 4; - } - break; - default: - abort (); - } - - if (info->relocatable) - addend += sec->output_offset; - else - { - asection *msec = sec; - addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, - addend); - addend -= relocation; - addend += msec->output_section->vma + msec->output_offset; - } - - switch (howto->size) - { - case 0: - /* FIXME: overflow checks. */ - if (howto->pc_relative) - addend -= 1; - bfd_put_8 (input_bfd, addend, where); - break; - case 1: - if (howto->pc_relative) - addend -= 2; - bfd_put_16 (input_bfd, addend, where); - break; - case 2: - if (howto->pc_relative) - addend -= 4; - bfd_put_32 (input_bfd, addend, where); - break; - } - } - else if (!info->relocatable - && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC) - { - /* Relocate against local STT_GNU_IFUNC symbol. */ - h = elf_i386_get_local_sym_hash (htab, input_bfd, rel, - FALSE); - if (h == NULL) - abort (); - - /* Set STT_GNU_IFUNC symbol value. */ - h->root.u.def.value = sym->st_value; - h->root.u.def.section = sec; - } - } - else - { - bfd_boolean warned ATTRIBUTE_UNUSED; - - RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, - r_symndx, symtab_hdr, sym_hashes, - h, sec, relocation, - unresolved_reloc, warned); - st_size = h->size; - } - - if (sec != NULL && discarded_section (sec)) - RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, - rel, 1, relend, howto, 0, contents); - - if (info->relocatable) - continue; - - /* Since STT_GNU_IFUNC symbol must go through PLT, we handle - it here if it is defined in a non-shared object. */ - if (h != NULL - && h->type == STT_GNU_IFUNC - && h->def_regular) - { - asection *plt, *gotplt, *base_got; - bfd_vma plt_index; - const char *name; - - if ((input_section->flags & SEC_ALLOC) == 0 - || h->plt.offset == (bfd_vma) -1) - abort (); - - /* STT_GNU_IFUNC symbol must go through PLT. */ - if (htab->elf.splt != NULL) - { - plt = htab->elf.splt; - gotplt = htab->elf.sgotplt; - } - else - { - plt = htab->elf.iplt; - gotplt = htab->elf.igotplt; - } - - relocation = (plt->output_section->vma - + plt->output_offset + h->plt.offset); - - switch (r_type) - { - default: - if (h->root.root.string) - name = h->root.root.string; - else - name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym, - NULL); - (*_bfd_error_handler) - (_("%B: relocation %s against STT_GNU_IFUNC " - "symbol `%s' isn't handled by %s"), input_bfd, - elf_howto_table[r_type].name, - name, __FUNCTION__); - bfd_set_error (bfd_error_bad_value); - return FALSE; - - case R_386_32: - /* Generate dynamic relcoation only when there is a - non-GOT reference in a shared object. */ - if (info->shared && h->non_got_ref) - { - Elf_Internal_Rela outrel; - asection *sreloc; - bfd_vma offset; - - /* Need a dynamic relocation to get the real function - adddress. */ - offset = _bfd_elf_section_offset (output_bfd, - info, - input_section, - rel->r_offset); - if (offset == (bfd_vma) -1 - || offset == (bfd_vma) -2) - abort (); - - outrel.r_offset = (input_section->output_section->vma - + input_section->output_offset - + offset); - - if (h->dynindx == -1 - || h->forced_local - || info->executable) - { - /* This symbol is resolved locally. */ - outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE); - bfd_put_32 (output_bfd, - (h->root.u.def.value - + h->root.u.def.section->output_section->vma - + h->root.u.def.section->output_offset), - contents + offset); - } - else - outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); - - sreloc = htab->elf.irelifunc; - elf_append_rel (output_bfd, sreloc, &outrel); - - /* If this reloc is against an external symbol, we - do not want to fiddle with the addend. Otherwise, - we need to include the symbol value so that it - becomes an addend for the dynamic reloc. For an - internal symbol, we have updated addend. */ - continue; - } - /* FALLTHROUGH */ - case R_386_PC32: - case R_386_PLT32: - goto do_relocation; - - case R_386_GOT32: - base_got = htab->elf.sgot; - off = h->got.offset; - - if (base_got == NULL) - abort (); - - if (off == (bfd_vma) -1) - { - /* We can't use h->got.offset here to save state, or - even just remember the offset, as finish_dynamic_symbol - would use that as offset into .got. */ - - if (htab->elf.splt != NULL) - { - plt_index = h->plt.offset / plt_entry_size - 1; - off = (plt_index + 3) * 4; - base_got = htab->elf.sgotplt; - } - else - { - plt_index = h->plt.offset / plt_entry_size; - off = plt_index * 4; - base_got = htab->elf.igotplt; - } - - if (h->dynindx == -1 - || h->forced_local - || info->symbolic) - { - /* This references the local defitionion. We must - initialize this entry in the global offset table. - Since the offset must always be a multiple of 8, - we use the least significant bit to record - whether we have initialized it already. - - When doing a dynamic link, we create a .rela.got - relocation entry to initialize the value. This - is done in the finish_dynamic_symbol routine. */ - if ((off & 1) != 0) - off &= ~1; - else - { - bfd_put_32 (output_bfd, relocation, - base_got->contents + off); - h->got.offset |= 1; - } - } - - relocation = off; - - /* Adjust for static executables. */ - if (htab->elf.splt == NULL) - relocation += gotplt->output_offset; - } - else - { - relocation = (base_got->output_section->vma - + base_got->output_offset + off - - gotplt->output_section->vma - - gotplt->output_offset); - /* Adjust for static executables. */ - if (htab->elf.splt == NULL) - relocation += gotplt->output_offset; - } - - goto do_relocation; - - case R_386_GOTOFF: - relocation -= (gotplt->output_section->vma - + gotplt->output_offset); - goto do_relocation; - } - } - - switch (r_type) - { - case R_386_GOT32: - /* Relocation is to the entry for this symbol in the global - offset table. */ - if (htab->elf.sgot == NULL) - abort (); - - if (h != NULL) - { - bfd_boolean dyn; - - off = h->got.offset; - dyn = htab->elf.dynamic_sections_created; - if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) - || (info->shared - && SYMBOL_REFERENCES_LOCAL (info, h)) - || (ELF_ST_VISIBILITY (h->other) - && h->root.type == bfd_link_hash_undefweak)) - { - /* This is actually a static link, or it is a - -Bsymbolic link and the symbol is defined - locally, or the symbol was forced to be local - because of a version file. We must initialize - this entry in the global offset table. Since the - offset must always be a multiple of 4, we use the - least significant bit to record whether we have - initialized it already. - - When doing a dynamic link, we create a .rel.got - relocation entry to initialize the value. This - is done in the finish_dynamic_symbol routine. */ - if ((off & 1) != 0) - off &= ~1; - else - { - bfd_put_32 (output_bfd, relocation, - htab->elf.sgot->contents + off); - h->got.offset |= 1; - } - } - else - unresolved_reloc = FALSE; - } - else - { - if (local_got_offsets == NULL) - abort (); - - off = local_got_offsets[r_symndx]; - - /* The offset must always be a multiple of 4. We use - the least significant bit to record whether we have - already generated the necessary reloc. */ - if ((off & 1) != 0) - off &= ~1; - else - { - bfd_put_32 (output_bfd, relocation, - htab->elf.sgot->contents + off); - - if (info->shared) - { - asection *s; - Elf_Internal_Rela outrel; - - s = htab->elf.srelgot; - if (s == NULL) - abort (); - - outrel.r_offset = (htab->elf.sgot->output_section->vma - + htab->elf.sgot->output_offset - + off); - outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); - elf_append_rel (output_bfd, s, &outrel); - } - - local_got_offsets[r_symndx] |= 1; - } - } - - if (off >= (bfd_vma) -2) - abort (); - - relocation = htab->elf.sgot->output_section->vma - + htab->elf.sgot->output_offset + off - - htab->elf.sgotplt->output_section->vma - - htab->elf.sgotplt->output_offset; - break; - - case R_386_GOTOFF: - /* Relocation is relative to the start of the global offset - table. */ - - /* Check to make sure it isn't a protected function symbol - for shared library since it may not be local when used - as function address. We also need to make sure that a - symbol is defined locally. */ - if (info->shared && h) - { - if (!h->def_regular) - { - const char *v; - - switch (ELF_ST_VISIBILITY (h->other)) - { - case STV_HIDDEN: - v = _("hidden symbol"); - break; - case STV_INTERNAL: - v = _("internal symbol"); - break; - case STV_PROTECTED: - v = _("protected symbol"); - break; - default: - v = _("symbol"); - break; - } - - (*_bfd_error_handler) - (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"), - input_bfd, v, h->root.root.string); - bfd_set_error (bfd_error_bad_value); - return FALSE; - } - else if (!info->executable - && !SYMBOLIC_BIND (info, h) - && h->type == STT_FUNC - && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED) - { - (*_bfd_error_handler) - (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"), - input_bfd, h->root.root.string); - bfd_set_error (bfd_error_bad_value); - return FALSE; - } - } - - /* Note that sgot is not involved in this - calculation. We always want the start of .got.plt. If we - defined _GLOBAL_OFFSET_TABLE_ in a different way, as is - permitted by the ABI, we might have to change this - calculation. */ - relocation -= htab->elf.sgotplt->output_section->vma - + htab->elf.sgotplt->output_offset; - break; - - case R_386_GOTPC: - /* Use global offset table as symbol value. */ - relocation = htab->elf.sgotplt->output_section->vma - + htab->elf.sgotplt->output_offset; - unresolved_reloc = FALSE; - break; - - case R_386_PLT32: - /* Relocation is to the entry for this symbol in the - procedure linkage table. */ - - /* Resolve a PLT32 reloc against a local symbol directly, - without using the procedure linkage table. */ - if (h == NULL) - break; - - if (h->plt.offset == (bfd_vma) -1 - || htab->elf.splt == NULL) - { - /* We didn't make a PLT entry for this symbol. This - happens when statically linking PIC code, or when - using -Bsymbolic. */ - break; - } - - relocation = (htab->elf.splt->output_section->vma - + htab->elf.splt->output_offset - + h->plt.offset); - unresolved_reloc = FALSE; - break; - - case R_386_SIZE32: - /* Set to symbol size. */ - relocation = st_size; - /* Fall through. */ - - case R_386_32: - case R_386_PC32: - if ((input_section->flags & SEC_ALLOC) == 0 - || is_vxworks_tls) - break; - - if ((info->shared - && (h == NULL - || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT - || h->root.type != bfd_link_hash_undefweak) - && ((r_type != R_386_PC32 && r_type != R_386_SIZE32) - || !SYMBOL_CALLS_LOCAL (info, h))) - || (ELIMINATE_COPY_RELOCS - && !info->shared - && h != NULL - && h->dynindx != -1 - && !h->non_got_ref - && ((h->def_dynamic - && !h->def_regular) - || h->root.type == bfd_link_hash_undefweak - || h->root.type == bfd_link_hash_undefined))) - { - Elf_Internal_Rela outrel; - bfd_boolean skip, relocate; - asection *sreloc; - - /* When generating a shared object, these relocations - are copied into the output file to be resolved at run - time. */ - - skip = FALSE; - relocate = FALSE; - - outrel.r_offset = - _bfd_elf_section_offset (output_bfd, info, input_section, - rel->r_offset); - if (outrel.r_offset == (bfd_vma) -1) - skip = TRUE; - else if (outrel.r_offset == (bfd_vma) -2) - skip = TRUE, relocate = TRUE; - outrel.r_offset += (input_section->output_section->vma - + input_section->output_offset); - - if (skip) - memset (&outrel, 0, sizeof outrel); - else if (h != NULL - && h->dynindx != -1 - && (r_type == R_386_PC32 - || !info->shared - || !SYMBOLIC_BIND (info, h) - || !h->def_regular)) - outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); - else - { - /* This symbol is local, or marked to become local. */ - relocate = TRUE; - outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); - } - - sreloc = elf_section_data (input_section)->sreloc; - - if (sreloc == NULL || sreloc->contents == NULL) - { - r = bfd_reloc_notsupported; - goto check_relocation_error; - } - - elf_append_rel (output_bfd, sreloc, &outrel); - - /* If this reloc is against an external symbol, we do - not want to fiddle with the addend. Otherwise, we - need to include the symbol value so that it becomes - an addend for the dynamic reloc. */ - if (! relocate) - continue; - } - break; - - case R_386_TLS_IE: - if (!info->executable) - { - Elf_Internal_Rela outrel; - asection *sreloc; - - outrel.r_offset = rel->r_offset - + input_section->output_section->vma - + input_section->output_offset; - outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); - sreloc = elf_section_data (input_section)->sreloc; - if (sreloc == NULL) - abort (); - elf_append_rel (output_bfd, sreloc, &outrel); - } - /* Fall through */ - - case R_386_TLS_GD: - case R_386_TLS_GOTDESC: - case R_386_TLS_DESC_CALL: - case R_386_TLS_IE_32: - case R_386_TLS_GOTIE: - tls_type = GOT_UNKNOWN; - if (h == NULL && local_got_offsets) - tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx]; - else if (h != NULL) - tls_type = elf_i386_hash_entry(h)->tls_type; - if (tls_type == GOT_TLS_IE) - tls_type = GOT_TLS_IE_NEG; - - if (! elf_i386_tls_transition (info, input_bfd, - input_section, contents, - symtab_hdr, sym_hashes, - &r_type, tls_type, rel, - relend, h, r_symndx)) - return FALSE; - - if (r_type == R_386_TLS_LE_32) - { - BFD_ASSERT (! unresolved_reloc); - if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD) - { - unsigned int type; - bfd_vma roff; - - /* GD->LE transition. */ - type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); - if (type == 0x04) - { - /* leal foo(,%reg,1), %eax; call ___tls_get_addr - Change it into: - movl %gs:0, %eax; subl $foo@tpoff, %eax - (6 byte form of subl). */ - memcpy (contents + rel->r_offset - 3, - "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); - roff = rel->r_offset + 5; - } - else - { - /* leal foo(%reg), %eax; call ___tls_get_addr; nop - Change it into: - movl %gs:0, %eax; subl $foo@tpoff, %eax - (6 byte form of subl). */ - memcpy (contents + rel->r_offset - 2, - "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); - roff = rel->r_offset + 6; - } - bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation), - contents + roff); - /* Skip R_386_PC32/R_386_PLT32. */ - rel++; - continue; - } - else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC) - { - /* GDesc -> LE transition. - It's originally something like: - leal x@tlsdesc(%ebx), %eax - - leal x@ntpoff, %eax - - Registers other than %eax may be set up here. */ - - unsigned int val; - bfd_vma roff; - - roff = rel->r_offset; - val = bfd_get_8 (input_bfd, contents + roff - 1); - - /* Now modify the instruction as appropriate. */ - /* aoliva FIXME: remove the above and xor the byte - below with 0x86. */ - bfd_put_8 (output_bfd, val ^ 0x86, - contents + roff - 1); - bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation), - contents + roff); - continue; - } - else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL) - { - /* GDesc -> LE transition. - It's originally: - call *(%eax) - Turn it into: - xchg %ax,%ax */ - - bfd_vma roff; - - roff = rel->r_offset; - bfd_put_8 (output_bfd, 0x66, contents + roff); - bfd_put_8 (output_bfd, 0x90, contents + roff + 1); - continue; - } - else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE) - { - unsigned int val; - - /* IE->LE transition: - Originally it can be one of: - movl foo, %eax - movl foo, %reg - addl foo, %reg - We change it into: - movl $foo, %eax - movl $foo, %reg - addl $foo, %reg. */ - val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); - if (val == 0xa1) - { - /* movl foo, %eax. */ - bfd_put_8 (output_bfd, 0xb8, - contents + rel->r_offset - 1); - } - else - { - unsigned int type; - - type = bfd_get_8 (input_bfd, - contents + rel->r_offset - 2); - switch (type) - { - case 0x8b: - /* movl */ - bfd_put_8 (output_bfd, 0xc7, - contents + rel->r_offset - 2); - bfd_put_8 (output_bfd, - 0xc0 | ((val >> 3) & 7), - contents + rel->r_offset - 1); - break; - case 0x03: - /* addl */ - bfd_put_8 (output_bfd, 0x81, - contents + rel->r_offset - 2); - bfd_put_8 (output_bfd, - 0xc0 | ((val >> 3) & 7), - contents + rel->r_offset - 1); - break; - default: - BFD_FAIL (); - break; - } - } - bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation), - contents + rel->r_offset); - continue; - } - else - { - unsigned int val, type; - - /* {IE_32,GOTIE}->LE transition: - Originally it can be one of: - subl foo(%reg1), %reg2 - movl foo(%reg1), %reg2 - addl foo(%reg1), %reg2 - We change it into: - subl $foo, %reg2 - movl $foo, %reg2 (6 byte form) - addl $foo, %reg2. */ - type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); - val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); - if (type == 0x8b) - { - /* movl */ - bfd_put_8 (output_bfd, 0xc7, - contents + rel->r_offset - 2); - bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), - contents + rel->r_offset - 1); - } - else if (type == 0x2b) - { - /* subl */ - bfd_put_8 (output_bfd, 0x81, - contents + rel->r_offset - 2); - bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7), - contents + rel->r_offset - 1); - } - else if (type == 0x03) - { - /* addl */ - bfd_put_8 (output_bfd, 0x81, - contents + rel->r_offset - 2); - bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), - contents + rel->r_offset - 1); - } - else - BFD_FAIL (); - if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE) - bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation), - contents + rel->r_offset); - else - bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation), - contents + rel->r_offset); - continue; - } - } - - if (htab->elf.sgot == NULL) - abort (); - - if (h != NULL) - { - off = h->got.offset; - offplt = elf_i386_hash_entry (h)->tlsdesc_got; - } - else - { - if (local_got_offsets == NULL) - abort (); - - off = local_got_offsets[r_symndx]; - offplt = local_tlsdesc_gotents[r_symndx]; - } - - if ((off & 1) != 0) - off &= ~1; - else - { - Elf_Internal_Rela outrel; - int dr_type; - asection *sreloc; - - if (htab->elf.srelgot == NULL) - abort (); - - indx = h && h->dynindx != -1 ? h->dynindx : 0; - - if (GOT_TLS_GDESC_P (tls_type)) - { - bfd_byte *loc; - outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC); - BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8 - <= htab->elf.sgotplt->size); - outrel.r_offset = (htab->elf.sgotplt->output_section->vma - + htab->elf.sgotplt->output_offset - + offplt - + htab->sgotplt_jump_table_size); - sreloc = htab->elf.srelplt; - loc = sreloc->contents; - loc += (htab->next_tls_desc_index++ - * sizeof (Elf32_External_Rel)); - BFD_ASSERT (loc + sizeof (Elf32_External_Rel) - <= sreloc->contents + sreloc->size); - bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); - if (indx == 0) - { - BFD_ASSERT (! unresolved_reloc); - bfd_put_32 (output_bfd, - relocation - elf_i386_dtpoff_base (info), - htab->elf.sgotplt->contents + offplt - + htab->sgotplt_jump_table_size + 4); - } - else - { - bfd_put_32 (output_bfd, 0, - htab->elf.sgotplt->contents + offplt - + htab->sgotplt_jump_table_size + 4); - } - } - - sreloc = htab->elf.srelgot; - - outrel.r_offset = (htab->elf.sgot->output_section->vma - + htab->elf.sgot->output_offset + off); - - if (GOT_TLS_GD_P (tls_type)) - dr_type = R_386_TLS_DTPMOD32; - else if (GOT_TLS_GDESC_P (tls_type)) - goto dr_done; - else if (tls_type == GOT_TLS_IE_POS) - dr_type = R_386_TLS_TPOFF; - else - dr_type = R_386_TLS_TPOFF32; - - if (dr_type == R_386_TLS_TPOFF && indx == 0) - bfd_put_32 (output_bfd, - relocation - elf_i386_dtpoff_base (info), - htab->elf.sgot->contents + off); - else if (dr_type == R_386_TLS_TPOFF32 && indx == 0) - bfd_put_32 (output_bfd, - elf_i386_dtpoff_base (info) - relocation, - htab->elf.sgot->contents + off); - else if (dr_type != R_386_TLS_DESC) - bfd_put_32 (output_bfd, 0, - htab->elf.sgot->contents + off); - outrel.r_info = ELF32_R_INFO (indx, dr_type); - - elf_append_rel (output_bfd, sreloc, &outrel); - - if (GOT_TLS_GD_P (tls_type)) - { - if (indx == 0) - { - BFD_ASSERT (! unresolved_reloc); - bfd_put_32 (output_bfd, - relocation - elf_i386_dtpoff_base (info), - htab->elf.sgot->contents + off + 4); - } - else - { - bfd_put_32 (output_bfd, 0, - htab->elf.sgot->contents + off + 4); - outrel.r_info = ELF32_R_INFO (indx, - R_386_TLS_DTPOFF32); - outrel.r_offset += 4; - elf_append_rel (output_bfd, sreloc, &outrel); - } - } - else if (tls_type == GOT_TLS_IE_BOTH) - { - bfd_put_32 (output_bfd, - (indx == 0 - ? relocation - elf_i386_dtpoff_base (info) - : 0), - htab->elf.sgot->contents + off + 4); - outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF); - outrel.r_offset += 4; - elf_append_rel (output_bfd, sreloc, &outrel); - } - - dr_done: - if (h != NULL) - h->got.offset |= 1; - else - local_got_offsets[r_symndx] |= 1; - } - - if (off >= (bfd_vma) -2 - && ! GOT_TLS_GDESC_P (tls_type)) - abort (); - if (r_type == R_386_TLS_GOTDESC - || r_type == R_386_TLS_DESC_CALL) - { - relocation = htab->sgotplt_jump_table_size + offplt; - unresolved_reloc = FALSE; - } - else if (r_type == ELF32_R_TYPE (rel->r_info)) - { - bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma - + htab->elf.sgotplt->output_offset; - relocation = htab->elf.sgot->output_section->vma - + htab->elf.sgot->output_offset + off - g_o_t; - if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE) - && tls_type == GOT_TLS_IE_BOTH) - relocation += 4; - if (r_type == R_386_TLS_IE) - relocation += g_o_t; - unresolved_reloc = FALSE; - } - else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD) - { - unsigned int val, type; - bfd_vma roff; - - /* GD->IE transition. */ - type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); - val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); - if (type == 0x04) - { - /* leal foo(,%reg,1), %eax; call ___tls_get_addr - Change it into: - movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */ - val >>= 3; - roff = rel->r_offset - 3; - } - else - { - /* leal foo(%reg), %eax; call ___tls_get_addr; nop - Change it into: - movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */ - roff = rel->r_offset - 2; - } - memcpy (contents + roff, - "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12); - contents[roff + 7] = 0x80 | (val & 7); - /* If foo is used only with foo@gotntpoff(%reg) and - foo@indntpoff, but not with foo@gottpoff(%reg), change - subl $foo@gottpoff(%reg), %eax - into: - addl $foo@gotntpoff(%reg), %eax. */ - if (tls_type == GOT_TLS_IE_POS) - contents[roff + 6] = 0x03; - bfd_put_32 (output_bfd, - htab->elf.sgot->output_section->vma - + htab->elf.sgot->output_offset + off - - htab->elf.sgotplt->output_section->vma - - htab->elf.sgotplt->output_offset, - contents + roff + 8); - /* Skip R_386_PLT32. */ - rel++; - continue; - } - else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC) - { - /* GDesc -> IE transition. - It's originally something like: - leal x@tlsdesc(%ebx), %eax - - Change it to: - movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax - or: - movl x@gottpoff(%ebx), %eax # before negl %eax - - Registers other than %eax may be set up here. */ - - bfd_vma roff; - - /* First, make sure it's a leal adding ebx to a 32-bit - offset into any register, although it's probably - almost always going to be eax. */ - roff = rel->r_offset; - - /* Now modify the instruction as appropriate. */ - /* To turn a leal into a movl in the form we use it, it - suffices to change the first byte from 0x8d to 0x8b. - aoliva FIXME: should we decide to keep the leal, all - we have to do is remove the statement below, and - adjust the relaxation of R_386_TLS_DESC_CALL. */ - bfd_put_8 (output_bfd, 0x8b, contents + roff - 2); - - if (tls_type == GOT_TLS_IE_BOTH) - off += 4; - - bfd_put_32 (output_bfd, - htab->elf.sgot->output_section->vma - + htab->elf.sgot->output_offset + off - - htab->elf.sgotplt->output_section->vma - - htab->elf.sgotplt->output_offset, - contents + roff); - continue; - } - else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL) - { - /* GDesc -> IE transition. - It's originally: - call *(%eax) - - Change it to: - xchg %ax,%ax - or - negl %eax - depending on how we transformed the TLS_GOTDESC above. - */ - - bfd_vma roff; - - roff = rel->r_offset; - - /* Now modify the instruction as appropriate. */ - if (tls_type != GOT_TLS_IE_NEG) - { - /* xchg %ax,%ax */ - bfd_put_8 (output_bfd, 0x66, contents + roff); - bfd_put_8 (output_bfd, 0x90, contents + roff + 1); - } - else - { - /* negl %eax */ - bfd_put_8 (output_bfd, 0xf7, contents + roff); - bfd_put_8 (output_bfd, 0xd8, contents + roff + 1); - } - - continue; - } - else - BFD_ASSERT (FALSE); - break; - - case R_386_TLS_LDM: - if (! elf_i386_tls_transition (info, input_bfd, - input_section, contents, - symtab_hdr, sym_hashes, - &r_type, GOT_UNKNOWN, rel, - relend, h, r_symndx)) - return FALSE; - - if (r_type != R_386_TLS_LDM) - { - /* LD->LE transition: - leal foo(%reg), %eax; call ___tls_get_addr. - We change it into: - movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */ - BFD_ASSERT (r_type == R_386_TLS_LE_32); - memcpy (contents + rel->r_offset - 2, - "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11); - /* Skip R_386_PC32/R_386_PLT32. */ - rel++; - continue; - } - - if (htab->elf.sgot == NULL) - abort (); - - off = htab->tls_ldm_got.offset; - if (off & 1) - off &= ~1; - else - { - Elf_Internal_Rela outrel; - - if (htab->elf.srelgot == NULL) - abort (); - - outrel.r_offset = (htab->elf.sgot->output_section->vma - + htab->elf.sgot->output_offset + off); - - bfd_put_32 (output_bfd, 0, - htab->elf.sgot->contents + off); - bfd_put_32 (output_bfd, 0, - htab->elf.sgot->contents + off + 4); - outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32); - elf_append_rel (output_bfd, htab->elf.srelgot, &outrel); - htab->tls_ldm_got.offset |= 1; - } - relocation = htab->elf.sgot->output_section->vma - + htab->elf.sgot->output_offset + off - - htab->elf.sgotplt->output_section->vma - - htab->elf.sgotplt->output_offset; - unresolved_reloc = FALSE; - break; - - case R_386_TLS_LDO_32: - if (!info->executable || (input_section->flags & SEC_CODE) == 0) - relocation -= elf_i386_dtpoff_base (info); - else - /* When converting LDO to LE, we must negate. */ - relocation = -elf_i386_tpoff (info, relocation); - break; - - case R_386_TLS_LE_32: - case R_386_TLS_LE: - if (!info->executable) - { - Elf_Internal_Rela outrel; - asection *sreloc; - - outrel.r_offset = rel->r_offset - + input_section->output_section->vma - + input_section->output_offset; - if (h != NULL && h->dynindx != -1) - indx = h->dynindx; - else - indx = 0; - if (r_type == R_386_TLS_LE_32) - outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32); - else - outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF); - sreloc = elf_section_data (input_section)->sreloc; - if (sreloc == NULL) - abort (); - elf_append_rel (output_bfd, sreloc, &outrel); - if (indx) - continue; - else if (r_type == R_386_TLS_LE_32) - relocation = elf_i386_dtpoff_base (info) - relocation; - else - relocation -= elf_i386_dtpoff_base (info); - } - else if (r_type == R_386_TLS_LE_32) - relocation = elf_i386_tpoff (info, relocation); - else - relocation = -elf_i386_tpoff (info, relocation); - break; - - default: - break; - } - - /* Dynamic relocs are not propagated for SEC_DEBUGGING sections - because such sections are not SEC_ALLOC and thus ld.so will - not process them. */ - if (unresolved_reloc - && !((input_section->flags & SEC_DEBUGGING) != 0 - && h->def_dynamic) - && _bfd_elf_section_offset (output_bfd, info, input_section, - rel->r_offset) != (bfd_vma) -1) - { - (*_bfd_error_handler) - (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), - input_bfd, - input_section, - (long) rel->r_offset, - howto->name, - h->root.root.string); - return FALSE; - } - -do_relocation: - r = _bfd_final_link_relocate (howto, input_bfd, input_section, - contents, rel->r_offset, - relocation, 0); - -check_relocation_error: - if (r != bfd_reloc_ok) - { - const char *name; - - if (h != NULL) - name = h->root.root.string; - else - { - name = bfd_elf_string_from_elf_section (input_bfd, - symtab_hdr->sh_link, - sym->st_name); - if (name == NULL) - return FALSE; - if (*name == '\0') - name = bfd_section_name (input_bfd, sec); - } - - if (r == bfd_reloc_overflow) - { - if (! ((*info->callbacks->reloc_overflow) - (info, (h ? &h->root : NULL), name, howto->name, - (bfd_vma) 0, input_bfd, input_section, - rel->r_offset))) - return FALSE; - } - else - { - (*_bfd_error_handler) - (_("%B(%A+0x%lx): reloc against `%s': error %d"), - input_bfd, input_section, - (long) rel->r_offset, name, (int) r); - return FALSE; - } - } - } - - return TRUE; -} - -/* Finish up dynamic symbol handling. We set the contents of various - dynamic sections here. */ - -static bfd_boolean -elf_i386_finish_dynamic_symbol (bfd *output_bfd, - struct bfd_link_info *info, - struct elf_link_hash_entry *h, - Elf_Internal_Sym *sym) -{ - struct elf_i386_link_hash_table *htab; - unsigned plt_entry_size; - const struct elf_i386_backend_data *abed; - - htab = elf_i386_hash_table (info); - if (htab == NULL) - return FALSE; - - abed = get_elf_i386_backend_data (output_bfd); - plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd); - - if (h->plt.offset != (bfd_vma) -1) - { - bfd_vma plt_index; - bfd_vma got_offset; - Elf_Internal_Rela rel; - bfd_byte *loc; - asection *plt, *gotplt, *relplt; - - /* When building a static executable, use .iplt, .igot.plt and - .rel.iplt sections for STT_GNU_IFUNC symbols. */ - if (htab->elf.splt != NULL) - { - plt = htab->elf.splt; - gotplt = htab->elf.sgotplt; - relplt = htab->elf.srelplt; - } - else - { - plt = htab->elf.iplt; - gotplt = htab->elf.igotplt; - relplt = htab->elf.irelplt; - } - - /* This symbol has an entry in the procedure linkage table. Set - it up. */ - - if ((h->dynindx == -1 - && !((h->forced_local || info->executable) - && h->def_regular - && h->type == STT_GNU_IFUNC)) - || plt == NULL - || gotplt == NULL - || relplt == NULL) - abort (); - - /* Get the index in the procedure linkage table which - corresponds to this symbol. This is the index of this symbol - in all the symbols for which we are making plt entries. The - first entry in the procedure linkage table is reserved. - - Get the offset into the .got table of the entry that - corresponds to this function. Each .got entry is 4 bytes. - The first three are reserved. - - For static executables, we don't reserve anything. */ - - if (plt == htab->elf.splt) - { - got_offset = h->plt.offset / plt_entry_size - 1; - got_offset = (got_offset + 3) * 4; - } - else - { - got_offset = h->plt.offset / plt_entry_size; - got_offset = got_offset * 4; - } - - /* Fill in the entry in the procedure linkage table. */ - if (! info->shared) - { - memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry, - abed->plt->plt_entry_size); - bfd_put_32 (output_bfd, - (gotplt->output_section->vma - + gotplt->output_offset - + got_offset), - plt->contents + h->plt.offset - + abed->plt->plt_got_offset); - - if (abed->is_vxworks) - { - int s, k, reloc_index; - - /* Create the R_386_32 relocation referencing the GOT - for this PLT entry. */ - - /* S: Current slot number (zero-based). */ - s = ((h->plt.offset - abed->plt->plt_entry_size) - / abed->plt->plt_entry_size); - /* K: Number of relocations for PLTResolve. */ - if (info->shared) - k = PLTRESOLVE_RELOCS_SHLIB; - else - k = PLTRESOLVE_RELOCS; - /* Skip the PLTresolve relocations, and the relocations for - the other PLT slots. */ - reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS; - loc = (htab->srelplt2->contents + reloc_index - * sizeof (Elf32_External_Rel)); - - rel.r_offset = (htab->elf.splt->output_section->vma - + htab->elf.splt->output_offset - + h->plt.offset + 2), - rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32); - bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); - - /* Create the R_386_32 relocation referencing the beginning of - the PLT for this GOT entry. */ - rel.r_offset = (htab->elf.sgotplt->output_section->vma - + htab->elf.sgotplt->output_offset - + got_offset); - rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32); - bfd_elf32_swap_reloc_out (output_bfd, &rel, - loc + sizeof (Elf32_External_Rel)); - } - } - else - { - memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry, - abed->plt->plt_entry_size); - bfd_put_32 (output_bfd, got_offset, - plt->contents + h->plt.offset - + abed->plt->plt_got_offset); - } - - /* Fill in the entry in the global offset table. */ - bfd_put_32 (output_bfd, - (plt->output_section->vma - + plt->output_offset - + h->plt.offset - + abed->plt->plt_lazy_offset), - gotplt->contents + got_offset); - - /* Fill in the entry in the .rel.plt section. */ - rel.r_offset = (gotplt->output_section->vma - + gotplt->output_offset - + got_offset); - if (h->dynindx == -1 - || ((info->executable - || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) - && h->def_regular - && h->type == STT_GNU_IFUNC)) - { - /* If an STT_GNU_IFUNC symbol is locally defined, generate - R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend - in the .got.plt section. */ - bfd_put_32 (output_bfd, - (h->root.u.def.value - + h->root.u.def.section->output_section->vma - + h->root.u.def.section->output_offset), - gotplt->contents + got_offset); - rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE); - /* R_386_IRELATIVE comes last. */ - plt_index = htab->next_irelative_index--; - } - else - { - rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT); - plt_index = htab->next_jump_slot_index++; - } - loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel); - bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); - - /* Don't fill PLT entry for static executables. */ - if (plt == htab->elf.splt) - { - bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel), - plt->contents + h->plt.offset - + abed->plt->plt_reloc_offset); - bfd_put_32 (output_bfd, - (h->plt.offset - + abed->plt->plt_plt_offset + 4), - plt->contents + h->plt.offset - + abed->plt->plt_plt_offset); - } - - if (!h->def_regular) - { - /* Mark the symbol as undefined, rather than as defined in - the .plt section. Leave the value if there were any - relocations where pointer equality matters (this is a clue - for the dynamic linker, to make function pointer - comparisons work between an application and shared - library), otherwise set it to zero. If a function is only - called from a binary, there is no need to slow down - shared libraries because of that. */ - sym->st_shndx = SHN_UNDEF; - if (!h->pointer_equality_needed) - sym->st_value = 0; - } - } - - if (h->got.offset != (bfd_vma) -1 - && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type) - && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0) - { - Elf_Internal_Rela rel; - - /* This symbol has an entry in the global offset table. Set it - up. */ - - if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL) - abort (); - - rel.r_offset = (htab->elf.sgot->output_section->vma - + htab->elf.sgot->output_offset - + (h->got.offset & ~(bfd_vma) 1)); - - /* If this is a static link, or it is a -Bsymbolic link and the - symbol is defined locally or was forced to be local because - of a version file, we just want to emit a RELATIVE reloc. - The entry in the global offset table will already have been - initialized in the relocate_section function. */ - if (h->def_regular - && h->type == STT_GNU_IFUNC) - { - if (info->shared) - { - /* Generate R_386_GLOB_DAT. */ - goto do_glob_dat; - } - else - { - asection *plt; - - if (!h->pointer_equality_needed) - abort (); - - /* For non-shared object, we can't use .got.plt, which - contains the real function addres if we need pointer - equality. We load the GOT entry with the PLT entry. */ - plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt; - bfd_put_32 (output_bfd, - (plt->output_section->vma - + plt->output_offset + h->plt.offset), - htab->elf.sgot->contents + h->got.offset); - return TRUE; - } - } - else if (info->shared - && SYMBOL_REFERENCES_LOCAL (info, h)) - { - BFD_ASSERT((h->got.offset & 1) != 0); - rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); - } - else - { - BFD_ASSERT((h->got.offset & 1) == 0); -do_glob_dat: - bfd_put_32 (output_bfd, (bfd_vma) 0, - htab->elf.sgot->contents + h->got.offset); - rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT); - } - - elf_append_rel (output_bfd, htab->elf.srelgot, &rel); - } - - if (h->needs_copy) - { - Elf_Internal_Rela rel; - - /* This symbol needs a copy reloc. Set it up. */ - - if (h->dynindx == -1 - || (h->root.type != bfd_link_hash_defined - && h->root.type != bfd_link_hash_defweak) - || htab->srelbss == NULL) - abort (); - - rel.r_offset = (h->root.u.def.value - + h->root.u.def.section->output_section->vma - + h->root.u.def.section->output_offset); - rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY); - elf_append_rel (output_bfd, htab->srelbss, &rel); - } - - return TRUE; -} - -/* Finish up local dynamic symbol handling. We set the contents of - various dynamic sections here. */ - -static bfd_boolean -elf_i386_finish_local_dynamic_symbol (void **slot, void *inf) -{ - struct elf_link_hash_entry *h - = (struct elf_link_hash_entry *) *slot; - struct bfd_link_info *info - = (struct bfd_link_info *) inf; - - return elf_i386_finish_dynamic_symbol (info->output_bfd, info, - h, NULL); -} - -/* Used to decide how to sort relocs in an optimal manner for the - dynamic linker, before writing them out. */ - -static enum elf_reloc_type_class -elf_i386_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED, - const asection *rel_sec ATTRIBUTE_UNUSED, - const Elf_Internal_Rela *rela) -{ - switch (ELF32_R_TYPE (rela->r_info)) - { - case R_386_RELATIVE: - return reloc_class_relative; - case R_386_JUMP_SLOT: - return reloc_class_plt; - case R_386_COPY: - return reloc_class_copy; - default: - return reloc_class_normal; - } -} - -/* Finish up the dynamic sections. */ - -static bfd_boolean -elf_i386_finish_dynamic_sections (bfd *output_bfd, - struct bfd_link_info *info) -{ - struct elf_i386_link_hash_table *htab; - bfd *dynobj; - asection *sdyn; - const struct elf_i386_backend_data *abed; - - htab = elf_i386_hash_table (info); - if (htab == NULL) - return FALSE; - - dynobj = htab->elf.dynobj; - sdyn = bfd_get_linker_section (dynobj, ".dynamic"); - abed = get_elf_i386_backend_data (output_bfd); - - if (htab->elf.dynamic_sections_created) - { - Elf32_External_Dyn *dyncon, *dynconend; - - if (sdyn == NULL || htab->elf.sgot == NULL) - abort (); - - dyncon = (Elf32_External_Dyn *) sdyn->contents; - dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); - for (; dyncon < dynconend; dyncon++) - { - Elf_Internal_Dyn dyn; - asection *s; - - bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); - - switch (dyn.d_tag) - { - default: - if (abed->is_vxworks - && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn)) - break; - continue; - - case DT_PLTGOT: - s = htab->elf.sgotplt; - dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; - break; - - case DT_JMPREL: - s = htab->elf.srelplt; - dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; - break; - - case DT_PLTRELSZ: - s = htab->elf.srelplt; - dyn.d_un.d_val = s->size; - break; - - case DT_RELSZ: - /* My reading of the SVR4 ABI indicates that the - procedure linkage table relocs (DT_JMPREL) should be - included in the overall relocs (DT_REL). This is - what Solaris does. However, UnixWare can not handle - that case. Therefore, we override the DT_RELSZ entry - here to make it not include the JMPREL relocs. */ - s = htab->elf.srelplt; - if (s == NULL) - continue; - dyn.d_un.d_val -= s->size; - break; - - case DT_REL: - /* We may not be using the standard ELF linker script. - If .rel.plt is the first .rel section, we adjust - DT_REL to not include it. */ - s = htab->elf.srelplt; - if (s == NULL) - continue; - if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset) - continue; - dyn.d_un.d_ptr += s->size; - break; - } - - bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); - } - - /* Fill in the first entry in the procedure linkage table. */ - if (htab->elf.splt && htab->elf.splt->size > 0) - { - if (info->shared) - { - memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry, - abed->plt->plt0_entry_size); - memset (htab->elf.splt->contents + abed->plt->plt0_entry_size, - abed->plt0_pad_byte, - abed->plt->plt_entry_size - abed->plt->plt0_entry_size); - } - else - { - memcpy (htab->elf.splt->contents, abed->plt->plt0_entry, - abed->plt->plt0_entry_size); - memset (htab->elf.splt->contents + abed->plt->plt0_entry_size, - abed->plt0_pad_byte, - abed->plt->plt_entry_size - abed->plt->plt0_entry_size); - bfd_put_32 (output_bfd, - (htab->elf.sgotplt->output_section->vma - + htab->elf.sgotplt->output_offset - + 4), - htab->elf.splt->contents - + abed->plt->plt0_got1_offset); - bfd_put_32 (output_bfd, - (htab->elf.sgotplt->output_section->vma - + htab->elf.sgotplt->output_offset - + 8), - htab->elf.splt->contents - + abed->plt->plt0_got2_offset); - - if (abed->is_vxworks) - { - Elf_Internal_Rela rel; - - /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4. - On IA32 we use REL relocations so the addend goes in - the PLT directly. */ - rel.r_offset = (htab->elf.splt->output_section->vma - + htab->elf.splt->output_offset - + abed->plt->plt0_got1_offset); - rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32); - bfd_elf32_swap_reloc_out (output_bfd, &rel, - htab->srelplt2->contents); - /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */ - rel.r_offset = (htab->elf.splt->output_section->vma - + htab->elf.splt->output_offset - + abed->plt->plt0_got2_offset); - rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32); - bfd_elf32_swap_reloc_out (output_bfd, &rel, - htab->srelplt2->contents + - sizeof (Elf32_External_Rel)); - } - } - - /* UnixWare sets the entsize of .plt to 4, although that doesn't - really seem like the right value. */ - elf_section_data (htab->elf.splt->output_section) - ->this_hdr.sh_entsize = 4; - - /* Correct the .rel.plt.unloaded relocations. */ - if (abed->is_vxworks && !info->shared) - { - int num_plts = (htab->elf.splt->size - / abed->plt->plt_entry_size) - 1; - unsigned char *p; - - p = htab->srelplt2->contents; - if (info->shared) - p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel); - else - p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel); - - for (; num_plts; num_plts--) - { - Elf_Internal_Rela rel; - bfd_elf32_swap_reloc_in (output_bfd, p, &rel); - rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32); - bfd_elf32_swap_reloc_out (output_bfd, &rel, p); - p += sizeof (Elf32_External_Rel); - - bfd_elf32_swap_reloc_in (output_bfd, p, &rel); - rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32); - bfd_elf32_swap_reloc_out (output_bfd, &rel, p); - p += sizeof (Elf32_External_Rel); - } - } - } - } - - if (htab->elf.sgotplt) - { - if (bfd_is_abs_section (htab->elf.sgotplt->output_section)) - { - (*_bfd_error_handler) - (_("discarded output section: `%A'"), htab->elf.sgotplt); - return FALSE; - } - - /* Fill in the first three entries in the global offset table. */ - if (htab->elf.sgotplt->size > 0) - { - bfd_put_32 (output_bfd, - (sdyn == NULL ? 0 - : sdyn->output_section->vma + sdyn->output_offset), - htab->elf.sgotplt->contents); - bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4); - bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8); - } - - elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4; - } - - /* Adjust .eh_frame for .plt section. */ - if (htab->plt_eh_frame != NULL - && htab->plt_eh_frame->contents != NULL) - { - if (htab->elf.splt != NULL - && htab->elf.splt->size != 0 - && (htab->elf.splt->flags & SEC_EXCLUDE) == 0 - && htab->elf.splt->output_section != NULL - && htab->plt_eh_frame->output_section != NULL) - { - bfd_vma plt_start = htab->elf.splt->output_section->vma; - bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma - + htab->plt_eh_frame->output_offset - + PLT_FDE_START_OFFSET; - bfd_put_signed_32 (dynobj, plt_start - eh_frame_start, - htab->plt_eh_frame->contents - + PLT_FDE_START_OFFSET); - } - if (htab->plt_eh_frame->sec_info_type - == SEC_INFO_TYPE_EH_FRAME) - { - if (! _bfd_elf_write_section_eh_frame (output_bfd, info, - htab->plt_eh_frame, - htab->plt_eh_frame->contents)) - return FALSE; - } - } - - if (htab->elf.sgot && htab->elf.sgot->size > 0) - elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4; - - /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */ - htab_traverse (htab->loc_hash_table, - elf_i386_finish_local_dynamic_symbol, - info); - - return TRUE; -} - -/* Return address for Ith PLT stub in section PLT, for relocation REL - or (bfd_vma) -1 if it should not be included. */ - -static bfd_vma -elf_i386_plt_sym_val (bfd_vma i, const asection *plt, - const arelent *rel ATTRIBUTE_UNUSED) -{ - return plt->vma + (i + 1) * GET_PLT_ENTRY_SIZE (plt->owner); -} - -/* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */ - -static bfd_boolean -elf_i386_hash_symbol (struct elf_link_hash_entry *h) -{ - if (h->plt.offset != (bfd_vma) -1 - && !h->def_regular - && !h->pointer_equality_needed) - return FALSE; - - return _bfd_elf_hash_symbol (h); -} - -/* Hook called by the linker routine which adds symbols from an object - file. */ - -static bfd_boolean -elf_i386_add_symbol_hook (bfd * abfd, - struct bfd_link_info * info ATTRIBUTE_UNUSED, - Elf_Internal_Sym * sym, - const char ** namep ATTRIBUTE_UNUSED, - flagword * flagsp ATTRIBUTE_UNUSED, - asection ** secp ATTRIBUTE_UNUSED, - bfd_vma * valp ATTRIBUTE_UNUSED) -{ - if ((abfd->flags & DYNAMIC) == 0 - && (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC - || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE)) - elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE; - - return TRUE; -} - -#define TARGET_LITTLE_SYM bfd_elf32_i386_vec -#define TARGET_LITTLE_NAME "elf32-i386" -#define ELF_ARCH bfd_arch_i386 -#define ELF_TARGET_ID I386_ELF_DATA -#define ELF_MACHINE_CODE EM_386 -#define ELF_MAXPAGESIZE 0x1000 - -#define elf_backend_can_gc_sections 1 -#define elf_backend_can_refcount 1 -#define elf_backend_want_got_plt 1 -#define elf_backend_plt_readonly 1 -#define elf_backend_want_plt_sym 0 -#define elf_backend_got_header_size 12 -#define elf_backend_plt_alignment 4 - -/* Support RELA for objdump of prelink objects. */ -#define elf_info_to_howto elf_i386_info_to_howto_rel -#define elf_info_to_howto_rel elf_i386_info_to_howto_rel - -#define bfd_elf32_mkobject elf_i386_mkobject - -#define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name -#define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create -#define bfd_elf32_bfd_link_hash_table_free elf_i386_link_hash_table_free -#define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup -#define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup - -#define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol -#define elf_backend_relocs_compatible _bfd_elf_relocs_compatible -#define elf_backend_check_relocs elf_i386_check_relocs -#define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol -#define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections -#define elf_backend_fake_sections elf_i386_fake_sections -#define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections -#define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol -#define elf_backend_gc_mark_hook elf_i386_gc_mark_hook -#define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook -#define elf_backend_grok_prstatus elf_i386_grok_prstatus -#define elf_backend_grok_psinfo elf_i386_grok_psinfo -#define elf_backend_reloc_type_class elf_i386_reloc_type_class -#define elf_backend_relocate_section elf_i386_relocate_section -#define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections -#define elf_backend_always_size_sections elf_i386_always_size_sections -#define elf_backend_omit_section_dynsym \ - ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true) -#define elf_backend_plt_sym_val elf_i386_plt_sym_val -#define elf_backend_hash_symbol elf_i386_hash_symbol -#define elf_backend_add_symbol_hook elf_i386_add_symbol_hook -#undef elf_backend_post_process_headers -#define elf_backend_post_process_headers _bfd_elf_set_osabi - -#include "elf32-target.h" - -/* FreeBSD support. */ - -#undef TARGET_LITTLE_SYM -#define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec -#undef TARGET_LITTLE_NAME -#define TARGET_LITTLE_NAME "elf32-i386-freebsd" -#undef ELF_OSABI -#define ELF_OSABI ELFOSABI_FREEBSD - -/* The kernel recognizes executables as valid only if they carry a - "FreeBSD" label in the ELF header. So we put this label on all - executables and (for simplicity) also all other object files. */ - -static void -elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info) -{ - _bfd_elf_set_osabi (abfd, info); - -#ifdef OLD_FREEBSD_ABI_LABEL - /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */ - memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8); -#endif -} - -#undef elf_backend_post_process_headers -#define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers -#undef elf32_bed -#define elf32_bed elf32_i386_fbsd_bed - -#undef elf_backend_add_symbol_hook - -#include "elf32-target.h" - -/* Solaris 2. */ - -#undef TARGET_LITTLE_SYM -#define TARGET_LITTLE_SYM bfd_elf32_i386_sol2_vec -#undef TARGET_LITTLE_NAME -#define TARGET_LITTLE_NAME "elf32-i386-sol2" - -/* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE - objects won't be recognized. */ -#undef ELF_OSABI - -#undef elf32_bed -#define elf32_bed elf32_i386_sol2_bed - -/* The 32-bit static TLS arena size is rounded to the nearest 8-byte - boundary. */ -#undef elf_backend_static_tls_alignment -#define elf_backend_static_tls_alignment 8 - -/* The Solaris 2 ABI requires a plt symbol on all platforms. - - Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output - File, p.63. */ -#undef elf_backend_want_plt_sym -#define elf_backend_want_plt_sym 1 - -#include "elf32-target.h" - -/* Native Client support. */ - -#undef TARGET_LITTLE_SYM -#define TARGET_LITTLE_SYM bfd_elf32_i386_nacl_vec -#undef TARGET_LITTLE_NAME -#define TARGET_LITTLE_NAME "elf32-i386-nacl" -#undef elf32_bed -#define elf32_bed elf32_i386_nacl_bed - -#undef ELF_MAXPAGESIZE -#define ELF_MAXPAGESIZE 0x10000 - -/* Restore defaults. */ -#undef ELF_OSABI -#undef elf_backend_want_plt_sym -#define elf_backend_want_plt_sym 0 -#undef elf_backend_post_process_headers -#define elf_backend_post_process_headers _bfd_elf_set_osabi -#undef elf_backend_static_tls_alignment - -/* NaCl uses substantially different PLT entries for the same effects. */ - -#undef elf_backend_plt_alignment -#define elf_backend_plt_alignment 5 -#define NACL_PLT_ENTRY_SIZE 64 -#define NACLMASK 0xe0 /* 32-byte alignment mask. */ - -static const bfd_byte elf_i386_nacl_plt0_entry[] = - { - 0xff, 0x35, /* pushl contents of address */ - 0, 0, 0, 0, /* replaced with address of .got + 4. */ - 0x8b, 0x0d, /* movl contents of address, %ecx */ - 0, 0, 0, 0, /* replaced with address of .got + 8. */ - 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */ - 0xff, 0xe1 /* jmp *%ecx */ - }; - -static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] = - { - 0x8b, 0x0d, /* movl contents of address, %ecx */ - 0, 0, 0, 0, /* replaced with GOT slot address. */ - 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */ - 0xff, 0xe1, /* jmp *%ecx */ - - /* Pad to the next 32-byte boundary with nop instructions. */ - 0x90, - 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, - 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, - - /* Lazy GOT entries point here (32-byte aligned). */ - 0x68, /* pushl immediate */ - 0, 0, 0, 0, /* replaced with reloc offset. */ - 0xe9, /* jmp relative */ - 0, 0, 0, 0, /* replaced with offset to .plt. */ - - /* Pad to the next 32-byte boundary with nop instructions. */ - 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, - 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, - 0x90, 0x90 - }; - -static const bfd_byte -elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] = - { - 0xff, 0x73, 0x04, /* pushl 4(%ebx) */ - 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */ - 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */ - 0xff, 0xe1, /* jmp *%ecx */ - - /* This is expected to be the same size as elf_i386_nacl_plt0_entry, - so pad to that size with nop instructions. */ - 0x90, 0x90, 0x90, 0x90, 0x90, 0x90 - }; - -static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] = - { - 0x8b, 0x8b, /* movl offset(%ebx), %ecx */ - 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ - 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */ - 0xff, 0xe1, /* jmp *%ecx */ - - /* Pad to the next 32-byte boundary with nop instructions. */ - 0x90, - 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, - 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, - - /* Lazy GOT entries point here (32-byte aligned). */ - 0x68, /* pushl immediate */ - 0, 0, 0, 0, /* replaced with offset into relocation table. */ - 0xe9, /* jmp relative */ - 0, 0, 0, 0, /* replaced with offset to start of .plt. */ - - /* Pad to the next 32-byte boundary with nop instructions. */ - 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, - 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, - 0x90, 0x90 - }; - -static const bfd_byte elf_i386_nacl_eh_frame_plt[] = - { -#if (PLT_CIE_LENGTH != 20 \ - || PLT_FDE_LENGTH != 36 \ - || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \ - || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12) -# error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!" -#endif - PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ - 0, 0, 0, 0, /* CIE ID */ - 1, /* CIE version */ - 'z', 'R', 0, /* Augmentation string */ - 1, /* Code alignment factor */ - 0x7c, /* Data alignment factor: -4 */ - 8, /* Return address column */ - 1, /* Augmentation size */ - DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ - DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */ - DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */ - DW_CFA_nop, DW_CFA_nop, - - PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */ - PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ - 0, 0, 0, 0, /* R_386_PC32 .plt goes here */ - 0, 0, 0, 0, /* .plt size goes here */ - 0, /* Augmentation size */ - DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */ - DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */ - DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */ - DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */ - DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */ - 13, /* Block length */ - DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */ - DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */ - DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge, - DW_OP_lit2, DW_OP_shl, DW_OP_plus, - DW_CFA_nop, DW_CFA_nop - }; - -static const struct elf_i386_plt_layout elf_i386_nacl_plt = - { - elf_i386_nacl_plt0_entry, /* plt0_entry */ - sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */ - 2, /* plt0_got1_offset */ - 8, /* plt0_got2_offset */ - elf_i386_nacl_plt_entry, /* plt_entry */ - NACL_PLT_ENTRY_SIZE, /* plt_entry_size */ - 2, /* plt_got_offset */ - 33, /* plt_reloc_offset */ - 38, /* plt_plt_offset */ - 32, /* plt_lazy_offset */ - elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */ - elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */ - elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */ - sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */ - }; - -static const struct elf_i386_backend_data elf_i386_nacl_arch_bed = - { - &elf_i386_nacl_plt, /* plt */ - 0x90, /* plt0_pad_byte: nop insn */ - 0, /* is_vxworks */ - }; - -static bfd_boolean -elf32_i386_nacl_elf_object_p (bfd *abfd) -{ - /* Set the right machine number for a NaCl i386 ELF32 file. */ - bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl); - return TRUE; -} - -#undef elf_backend_arch_data -#define elf_backend_arch_data &elf_i386_nacl_arch_bed - -#undef elf_backend_object_p -#define elf_backend_object_p elf32_i386_nacl_elf_object_p -#undef elf_backend_modify_segment_map -#define elf_backend_modify_segment_map nacl_modify_segment_map -#undef elf_backend_modify_program_headers -#define elf_backend_modify_program_headers nacl_modify_program_headers -#undef elf_backend_final_write_processing -#define elf_backend_final_write_processing nacl_final_write_processing - -#include "elf32-target.h" - -/* Restore defaults. */ -#undef elf_backend_object_p -#undef elf_backend_modify_segment_map -#undef elf_backend_modify_program_headers -#undef elf_backend_final_write_processing - -/* VxWorks support. */ - -#undef TARGET_LITTLE_SYM -#define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec -#undef TARGET_LITTLE_NAME -#define TARGET_LITTLE_NAME "elf32-i386-vxworks" -#undef ELF_OSABI -#undef elf_backend_plt_alignment -#define elf_backend_plt_alignment 4 - -static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed = - { - &elf_i386_plt, /* plt */ - 0x90, /* plt0_pad_byte */ - 1, /* is_vxworks */ - }; - -#undef elf_backend_arch_data -#define elf_backend_arch_data &elf_i386_vxworks_arch_bed - -#undef elf_backend_relocs_compatible -#undef elf_backend_post_process_headers -#undef elf_backend_add_symbol_hook -#define elf_backend_add_symbol_hook \ - elf_vxworks_add_symbol_hook -#undef elf_backend_link_output_symbol_hook -#define elf_backend_link_output_symbol_hook \ - elf_vxworks_link_output_symbol_hook -#undef elf_backend_emit_relocs -#define elf_backend_emit_relocs elf_vxworks_emit_relocs -#undef elf_backend_final_write_processing -#define elf_backend_final_write_processing \ - elf_vxworks_final_write_processing -#undef elf_backend_static_tls_alignment - -/* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so - define it. */ -#undef elf_backend_want_plt_sym -#define elf_backend_want_plt_sym 1 - -#undef elf32_bed -#define elf32_bed elf32_i386_vxworks_bed - -#include "elf32-target.h" |