diff options
Diffstat (limited to 'binutils-2.25/bfd/elf32-i386.c')
| -rw-r--r-- | binutils-2.25/bfd/elf32-i386.c | 5358 |
1 files changed, 5358 insertions, 0 deletions
diff --git a/binutils-2.25/bfd/elf32-i386.c b/binutils-2.25/bfd/elf32-i386.c new file mode 100644 index 00000000..560e05cc --- /dev/null +++ b/binutils-2.25/bfd/elf32-i386.c @@ -0,0 +1,5358 @@ +/* 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 */ + }; + +#undef elf_backend_arch_data +#define elf_backend_arch_data &elf_i386_nacl_arch_bed + +#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_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" |