diff options
Diffstat (limited to 'binutils-2.25/bfd/elf32-vax.c')
| -rw-r--r-- | binutils-2.25/bfd/elf32-vax.c | 2065 |
1 files changed, 2065 insertions, 0 deletions
diff --git a/binutils-2.25/bfd/elf32-vax.c b/binutils-2.25/bfd/elf32-vax.c new file mode 100644 index 00000000..c6a8f818 --- /dev/null +++ b/binutils-2.25/bfd/elf32-vax.c @@ -0,0 +1,2065 @@ +/* VAX series support for 32-bit ELF + Copyright 1993, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, + 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 + Free Software Foundation, Inc. + Contributed by Matt Thomas <matt@3am-software.com>. + + 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/vax.h" + +static reloc_howto_type *reloc_type_lookup (bfd *, bfd_reloc_code_real_type); +static void rtype_to_howto (bfd *, arelent *, Elf_Internal_Rela *); +static struct bfd_hash_entry *elf_vax_link_hash_newfunc (struct bfd_hash_entry *, + struct bfd_hash_table *, + const char *); +static struct bfd_link_hash_table *elf_vax_link_hash_table_create (bfd *); +static bfd_boolean elf_vax_check_relocs (bfd *, struct bfd_link_info *, + asection *, const Elf_Internal_Rela *); +static bfd_boolean elf_vax_adjust_dynamic_symbol (struct bfd_link_info *, + struct elf_link_hash_entry *); +static bfd_boolean elf_vax_size_dynamic_sections (bfd *, struct bfd_link_info *); +static bfd_boolean elf_vax_relocate_section (bfd *, struct bfd_link_info *, + bfd *, asection *, bfd_byte *, + Elf_Internal_Rela *, + Elf_Internal_Sym *, asection **); +static bfd_boolean elf_vax_finish_dynamic_symbol (bfd *, struct bfd_link_info *, + struct elf_link_hash_entry *, + Elf_Internal_Sym *); +static bfd_boolean elf_vax_finish_dynamic_sections (bfd *, + struct bfd_link_info *); +static bfd_vma elf_vax_plt_sym_val (bfd_vma, const asection *, + const arelent *); + +static bfd_boolean elf32_vax_set_private_flags (bfd *, flagword); +static bfd_boolean elf32_vax_merge_private_bfd_data (bfd *, bfd *); +static bfd_boolean elf32_vax_print_private_bfd_data (bfd *, void *); + +static reloc_howto_type howto_table[] = { + HOWTO (R_VAX_NONE, /* type */ + 0, /* rightshift */ + 0, /* size (0 = byte, 1 = short, 2 = long) */ + 0, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_VAX_NONE", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0x00000000, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_VAX_32, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_VAX_32", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0xffffffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_VAX_16, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_VAX_16", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0x0000ffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_VAX_8, /* type */ + 0, /* rightshift */ + 0, /* size (0 = byte, 1 = short, 2 = long) */ + 8, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_VAX_8", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0x000000ff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_VAX_PC32, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + TRUE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_VAX_PC32", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0xffffffff, /* dst_mask */ + TRUE), /* pcrel_offset */ + + HOWTO (R_VAX_PC16, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + TRUE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_signed, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_VAX_PC16", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0x0000ffff, /* dst_mask */ + TRUE), /* pcrel_offset */ + + HOWTO (R_VAX_PC8, /* type */ + 0, /* rightshift */ + 0, /* size (0 = byte, 1 = short, 2 = long) */ + 8, /* bitsize */ + TRUE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_signed, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_VAX_PC8", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0x000000ff, /* dst_mask */ + TRUE), /* pcrel_offset */ + + HOWTO (R_VAX_GOT32, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + TRUE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_VAX_GOT32", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0xffffffff, /* dst_mask */ + TRUE), /* pcrel_offset */ + + EMPTY_HOWTO (-1), + EMPTY_HOWTO (-1), + EMPTY_HOWTO (-1), + EMPTY_HOWTO (-1), + EMPTY_HOWTO (-1), + + HOWTO (R_VAX_PLT32, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + TRUE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_VAX_PLT32", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0xffffffff, /* dst_mask */ + TRUE), /* pcrel_offset */ + + EMPTY_HOWTO (-1), + EMPTY_HOWTO (-1), + EMPTY_HOWTO (-1), + EMPTY_HOWTO (-1), + EMPTY_HOWTO (-1), + + HOWTO (R_VAX_COPY, /* type */ + 0, /* rightshift */ + 0, /* size (0 = byte, 1 = short, 2 = long) */ + 0, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_VAX_COPY", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0xffffffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_VAX_GLOB_DAT, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_VAX_GLOB_DAT", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0xffffffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_VAX_JMP_SLOT, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_VAX_JMP_SLOT", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0xffffffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_VAX_RELATIVE, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_VAX_RELATIVE", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0xffffffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + /* GNU extension to record C++ vtable hierarchy */ + HOWTO (R_VAX_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_VAX_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_VAX_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_VAX_GNU_VTENTRY", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0, /* dst_mask */ + FALSE), /* pcrel_offset */ +}; + +static void +rtype_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr, + Elf_Internal_Rela *dst) +{ + BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_VAX_max); + cache_ptr->howto = &howto_table[ELF32_R_TYPE(dst->r_info)]; +} + +#define elf_info_to_howto rtype_to_howto + +static const struct +{ + bfd_reloc_code_real_type bfd_val; + int elf_val; +} reloc_map[] = { + { BFD_RELOC_NONE, R_VAX_NONE }, + { BFD_RELOC_32, R_VAX_32 }, + { BFD_RELOC_16, R_VAX_16 }, + { BFD_RELOC_8, R_VAX_8 }, + { BFD_RELOC_32_PCREL, R_VAX_PC32 }, + { BFD_RELOC_16_PCREL, R_VAX_PC16 }, + { BFD_RELOC_8_PCREL, R_VAX_PC8 }, + { BFD_RELOC_32_GOT_PCREL, R_VAX_GOT32 }, + { BFD_RELOC_32_PLT_PCREL, R_VAX_PLT32 }, + { BFD_RELOC_NONE, R_VAX_COPY }, + { BFD_RELOC_VAX_GLOB_DAT, R_VAX_GLOB_DAT }, + { BFD_RELOC_VAX_JMP_SLOT, R_VAX_JMP_SLOT }, + { BFD_RELOC_VAX_RELATIVE, R_VAX_RELATIVE }, + { BFD_RELOC_CTOR, R_VAX_32 }, + { BFD_RELOC_VTABLE_INHERIT, R_VAX_GNU_VTINHERIT }, + { BFD_RELOC_VTABLE_ENTRY, R_VAX_GNU_VTENTRY }, +}; + +static reloc_howto_type * +reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, bfd_reloc_code_real_type code) +{ + unsigned int i; + for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++) + { + if (reloc_map[i].bfd_val == code) + return &howto_table[reloc_map[i].elf_val]; + } + return 0; +} + +static reloc_howto_type * +reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, + const char *r_name) +{ + unsigned int i; + + for (i = 0; i < sizeof (howto_table) / sizeof (howto_table[0]); i++) + if (howto_table[i].name != NULL + && strcasecmp (howto_table[i].name, r_name) == 0) + return &howto_table[i]; + + return NULL; +} + +#define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup +#define bfd_elf32_bfd_reloc_name_lookup reloc_name_lookup +#define ELF_ARCH bfd_arch_vax +/* end code generated by elf.el */ + +/* Functions for the VAX ELF linker. */ + +/* The name of the dynamic interpreter. This is put in the .interp + section. */ + +#define ELF_DYNAMIC_INTERPRETER "/usr/libexec/ld.elf_so" + +/* The size in bytes of an entry in the procedure linkage table. */ + +#define PLT_ENTRY_SIZE 12 + +/* The first entry in a procedure linkage table looks like this. See + the SVR4 ABI VAX supplement to see how this works. */ + +static const bfd_byte elf_vax_plt0_entry[PLT_ENTRY_SIZE] = +{ + 0xdd, 0xef, /* pushl l^ */ + 0, 0, 0, 0, /* offset to .plt.got + 4 */ + 0x17, 0xff, /* jmp @L^(pc) */ + 0, 0, 0, 0, /* offset to .plt.got + 8 */ +}; + +/* Subsequent entries in a procedure linkage table look like this. */ + +static const bfd_byte elf_vax_plt_entry[PLT_ENTRY_SIZE] = +{ + 0xfc, 0x0f, /* .word ^M<r11:r2> */ + 0x16, 0xef, /* jsb L^(pc) */ + 0, 0, 0, 0, /* replaced with offset to start of .plt */ + 0, 0, 0, 0, /* index into .rela.plt */ +}; + +/* The VAX linker needs to keep track of the number of relocs that it + decides to copy in check_relocs for each symbol. This is so that it + can discard PC relative relocs if it doesn't need them when linking + with -Bsymbolic. We store the information in a field extending the + regular ELF linker hash table. */ + +/* This structure keeps track of the number of PC relative relocs we have + copied for a given symbol. */ + +struct elf_vax_pcrel_relocs_copied +{ + /* Next section. */ + struct elf_vax_pcrel_relocs_copied *next; + /* A section in dynobj. */ + asection *section; + /* Number of relocs copied in this section. */ + bfd_size_type count; +}; + +/* VAX ELF linker hash entry. */ + +struct elf_vax_link_hash_entry +{ + struct elf_link_hash_entry root; + + /* Number of PC relative relocs copied for this symbol. */ + struct elf_vax_pcrel_relocs_copied *pcrel_relocs_copied; + + bfd_vma got_addend; +}; + +/* Declare this now that the above structures are defined. */ + +static bfd_boolean elf_vax_discard_copies (struct elf_vax_link_hash_entry *, + void *); + +/* Declare this now that the above structures are defined. */ + +static bfd_boolean elf_vax_instantiate_got_entries (struct elf_link_hash_entry *, + void *); + +/* Traverse an VAX ELF linker hash table. */ + +#define elf_vax_link_hash_traverse(table, func, info) \ + (elf_link_hash_traverse \ + ((table), \ + (bfd_boolean (*) (struct elf_link_hash_entry *, void *)) (func), \ + (info))) + +/* Create an entry in an VAX ELF linker hash table. */ + +static struct bfd_hash_entry * +elf_vax_link_hash_newfunc (struct bfd_hash_entry *entry, + struct bfd_hash_table *table, + const char *string) +{ + struct elf_vax_link_hash_entry *ret = + (struct elf_vax_link_hash_entry *) entry; + + /* Allocate the structure if it has not already been allocated by a + subclass. */ + if (ret == NULL) + ret = ((struct elf_vax_link_hash_entry *) + bfd_hash_allocate (table, + sizeof (struct elf_vax_link_hash_entry))); + if (ret == NULL) + return (struct bfd_hash_entry *) ret; + + /* Call the allocation method of the superclass. */ + ret = ((struct elf_vax_link_hash_entry *) + _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, + table, string)); + if (ret != NULL) + { + ret->pcrel_relocs_copied = NULL; + } + + return (struct bfd_hash_entry *) ret; +} + +/* Create an VAX ELF linker hash table. */ + +static struct bfd_link_hash_table * +elf_vax_link_hash_table_create (bfd *abfd) +{ + struct elf_link_hash_table *ret; + bfd_size_type amt = sizeof (struct elf_link_hash_table); + + ret = bfd_zmalloc (amt); + if (ret == NULL) + return NULL; + + if (!_bfd_elf_link_hash_table_init (ret, abfd, + elf_vax_link_hash_newfunc, + sizeof (struct elf_vax_link_hash_entry), + GENERIC_ELF_DATA)) + { + free (ret); + return NULL; + } + + return &ret->root; +} + +/* Keep vax-specific flags in the ELF header */ +static bfd_boolean +elf32_vax_set_private_flags (bfd *abfd, flagword flags) +{ + elf_elfheader (abfd)->e_flags = flags; + elf_flags_init (abfd) = TRUE; + return TRUE; +} + +/* Merge backend specific data from an object file to the output + object file when linking. */ +static bfd_boolean +elf32_vax_merge_private_bfd_data (bfd *ibfd, bfd *obfd) +{ + flagword in_flags; + + if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour + || bfd_get_flavour (obfd) != bfd_target_elf_flavour) + return TRUE; + + in_flags = elf_elfheader (ibfd)->e_flags; + + if (!elf_flags_init (obfd)) + { + elf_flags_init (obfd) = TRUE; + elf_elfheader (obfd)->e_flags = in_flags; + } + + return TRUE; +} + +/* Display the flags field */ +static bfd_boolean +elf32_vax_print_private_bfd_data (bfd *abfd, void * ptr) +{ + FILE *file = (FILE *) ptr; + + BFD_ASSERT (abfd != NULL && ptr != NULL); + + /* Print normal ELF private data. */ + _bfd_elf_print_private_bfd_data (abfd, ptr); + + /* Ignore init flag - it may not be set, despite the flags field containing valid data. */ + + /* xgettext:c-format */ + fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); + + if (elf_elfheader (abfd)->e_flags & EF_VAX_NONPIC) + fprintf (file, _(" [nonpic]")); + + if (elf_elfheader (abfd)->e_flags & EF_VAX_DFLOAT) + fprintf (file, _(" [d-float]")); + + if (elf_elfheader (abfd)->e_flags & EF_VAX_GFLOAT) + fprintf (file, _(" [g-float]")); + + fputc ('\n', file); + + return TRUE; +} +/* Look through the relocs for a section during the first phase, and + allocate space in the global offset table or procedure linkage + table. */ + +static bfd_boolean +elf_vax_check_relocs (bfd *abfd, struct bfd_link_info *info, asection *sec, + const Elf_Internal_Rela *relocs) +{ + bfd *dynobj; + Elf_Internal_Shdr *symtab_hdr; + struct elf_link_hash_entry **sym_hashes; + const Elf_Internal_Rela *rel; + const Elf_Internal_Rela *rel_end; + asection *sgot; + asection *srelgot; + asection *sreloc; + + if (info->relocatable) + return TRUE; + + dynobj = elf_hash_table (info)->dynobj; + symtab_hdr = &elf_tdata (abfd)->symtab_hdr; + sym_hashes = elf_sym_hashes (abfd); + + sgot = NULL; + srelgot = NULL; + sreloc = NULL; + + rel_end = relocs + sec->reloc_count; + for (rel = relocs; rel < rel_end; rel++) + { + unsigned long r_symndx; + struct elf_link_hash_entry *h; + + r_symndx = ELF32_R_SYM (rel->r_info); + + if (r_symndx < symtab_hdr->sh_info) + h = NULL; + else + { + 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; + + /* PR15323, ref flags aren't set for references in the same + object. */ + h->root.non_ir_ref = 1; + } + + switch (ELF32_R_TYPE (rel->r_info)) + { + case R_VAX_GOT32: + BFD_ASSERT (h != NULL); + + /* If this is a local symbol, we resolve it directly without + creating a global offset table entry. */ + if (h->forced_local + || h == elf_hash_table (info)->hgot + || h == elf_hash_table (info)->hplt) + break; + + /* This symbol requires a global offset table entry. */ + + if (dynobj == NULL) + { + /* Create the .got section. */ + elf_hash_table (info)->dynobj = dynobj = abfd; + if (!_bfd_elf_create_got_section (dynobj, info)) + return FALSE; + } + + if (sgot == NULL) + { + sgot = bfd_get_linker_section (dynobj, ".got"); + BFD_ASSERT (sgot != NULL); + } + + if (srelgot == NULL + && (h != NULL || info->shared)) + { + srelgot = bfd_get_linker_section (dynobj, ".rela.got"); + if (srelgot == NULL) + { + flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS + | SEC_IN_MEMORY | SEC_LINKER_CREATED + | SEC_READONLY); + + srelgot = bfd_make_section_anyway_with_flags (dynobj, + ".rela.got", + flags); + if (srelgot == NULL + || !bfd_set_section_alignment (dynobj, srelgot, 2)) + return FALSE; + } + } + + if (h != NULL) + { + struct elf_vax_link_hash_entry *eh; + + eh = (struct elf_vax_link_hash_entry *) h; + if (h->got.refcount == -1) + { + h->got.refcount = 1; + eh->got_addend = rel->r_addend; + } + else + { + h->got.refcount++; + if (eh->got_addend != (bfd_vma) rel->r_addend) + (*_bfd_error_handler) + (_("%s: warning: GOT addend of %ld to `%s' does" + " not match previous GOT addend of %ld"), + bfd_get_filename (abfd), rel->r_addend, + h->root.root.string, + eh->got_addend); + + } + } + break; + + case R_VAX_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. */ + BFD_ASSERT (h != NULL); + + /* If this is a local symbol, we resolve it directly without + creating a procedure linkage table entry. */ + if (h->forced_local) + break; + + h->needs_plt = 1; + if (h->plt.refcount == -1) + h->plt.refcount = 1; + else + h->plt.refcount++; + break; + + case R_VAX_PC8: + case R_VAX_PC16: + case R_VAX_PC32: + /* If we are creating a shared library and this is not a local + symbol, we need to copy the reloc into the shared library. + However when linking with -Bsymbolic and this is a global + symbol which is defined in an object we are including in the + link (i.e., DEF_REGULAR is set), then we can resolve the + reloc directly. 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). We account for that + possibility below by storing information in the + pcrel_relocs_copied field of the hash table entry. */ + if (!(info->shared + && (sec->flags & SEC_ALLOC) != 0 + && h != NULL + && (!info->symbolic + || !h->def_regular))) + { + if (h != NULL + && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT + && !h->forced_local) + { + /* Make sure a plt entry is created for this symbol if + it turns out to be a function defined by a dynamic + object. */ + if (h->plt.refcount == -1) + h->plt.refcount = 1; + else + h->plt.refcount++; + } + break; + } + /* If this is a local symbol, we can resolve it directly. */ + if (h != NULL + && (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT + || h->forced_local)) + break; + + /* Fall through. */ + case R_VAX_8: + case R_VAX_16: + case R_VAX_32: + if (h != NULL && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) + { + /* Make sure a plt entry is created for this symbol if it + turns out to be a function defined by a dynamic object. */ + if (h->plt.refcount == -1) + h->plt.refcount = 1; + else + h->plt.refcount++; + } + + /* If we are creating a shared library, we need to copy the + reloc into the shared library. */ + if (info->shared + && (sec->flags & SEC_ALLOC) != 0) + { + /* When creating a shared object, we must copy these + reloc types into the output file. We create a reloc + section in dynobj and make room for this reloc. */ + if (sreloc == NULL) + { + sreloc = _bfd_elf_make_dynamic_reloc_section + (sec, dynobj, 2, abfd, /*rela?*/ TRUE); + + if (sreloc == NULL) + return FALSE; + + if (sec->flags & SEC_READONLY) + info->flags |= DF_TEXTREL; + } + + sreloc->size += sizeof (Elf32_External_Rela); + + /* If we are linking with -Bsymbolic, we count the number of + PC relative relocations we have entered for this symbol, + so that we can discard them again if the symbol is later + defined by a regular object. Note that this function is + only called if we are using a vaxelf linker hash table, + which means that h is really a pointer to an + elf_vax_link_hash_entry. */ + if ((ELF32_R_TYPE (rel->r_info) == R_VAX_PC8 + || ELF32_R_TYPE (rel->r_info) == R_VAX_PC16 + || ELF32_R_TYPE (rel->r_info) == R_VAX_PC32) + && info->symbolic) + { + struct elf_vax_link_hash_entry *eh; + struct elf_vax_pcrel_relocs_copied *p; + + eh = (struct elf_vax_link_hash_entry *) h; + + for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next) + if (p->section == sreloc) + break; + + if (p == NULL) + { + p = ((struct elf_vax_pcrel_relocs_copied *) + bfd_alloc (dynobj, (bfd_size_type) sizeof *p)); + if (p == NULL) + return FALSE; + p->next = eh->pcrel_relocs_copied; + eh->pcrel_relocs_copied = p; + p->section = sreloc; + p->count = 0; + } + + ++p->count; + } + } + + break; + + /* This relocation describes the C++ object vtable hierarchy. + Reconstruct it for later use during GC. */ + case R_VAX_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_VAX_GNU_VTENTRY: + BFD_ASSERT (h != NULL); + if (h != NULL + && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) + return FALSE; + break; + + default: + break; + } + } + + return TRUE; +} + +/* Return the section that should be marked against GC for a given + relocation. */ + +static asection * +elf_vax_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_VAX_GNU_VTINHERIT: + case R_VAX_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_vax_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info, asection *sec, + const Elf_Internal_Rela *relocs) +{ + Elf_Internal_Shdr *symtab_hdr; + struct elf_link_hash_entry **sym_hashes; + const Elf_Internal_Rela *rel, *relend; + bfd *dynobj; + + if (info->relocatable) + return TRUE; + + dynobj = elf_hash_table (info)->dynobj; + if (dynobj == NULL) + return TRUE; + + symtab_hdr = &elf_tdata (abfd)->symtab_hdr; + sym_hashes = elf_sym_hashes (abfd); + + relend = relocs + sec->reloc_count; + for (rel = relocs; rel < relend; rel++) + { + unsigned long r_symndx; + 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; + } + + switch (ELF32_R_TYPE (rel->r_info)) + { + case R_VAX_GOT32: + if (h != NULL && h->got.refcount > 0) + --h->got.refcount; + break; + + case R_VAX_PLT32: + case R_VAX_PC8: + case R_VAX_PC16: + case R_VAX_PC32: + case R_VAX_8: + case R_VAX_16: + case R_VAX_32: + if (h != NULL && h->plt.refcount > 0) + --h->plt.refcount; + 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_vax_adjust_dynamic_symbol (struct bfd_link_info *info, + struct elf_link_hash_entry *h) +{ + bfd *dynobj; + asection *s; + + dynobj = elf_hash_table (info)->dynobj; + + /* Make sure we know what is going on here. */ + BFD_ASSERT (dynobj != NULL + && (h->needs_plt + || h->u.weakdef != NULL + || (h->def_dynamic + && h->ref_regular + && !h->def_regular))); + + /* 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 PLTxx 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 PCxx reloc instead. */ + h->plt.offset = (bfd_vma) -1; + h->needs_plt = 0; + return TRUE; + } + + s = bfd_get_linker_section (dynobj, ".plt"); + BFD_ASSERT (s != NULL); + + /* If this is the first .plt entry, make room for the special + first entry. */ + if (s->size == 0) + { + s->size += PLT_ENTRY_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 = s->size; + } + + h->plt.offset = s->size; + + /* 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. */ + + s = bfd_get_linker_section (dynobj, ".got.plt"); + BFD_ASSERT (s != NULL); + s->size += 4; + + /* We also need to make an entry in the .rela.plt section. */ + + s = bfd_get_linker_section (dynobj, ".rela.plt"); + BFD_ASSERT (s != NULL); + s->size += sizeof (Elf32_External_Rela); + + return TRUE; + } + + /* Reinitialize the plt offset now that it is not used as a reference + count any more. */ + 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; + 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; + + /* 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. */ + + s = bfd_get_linker_section (dynobj, ".dynbss"); + BFD_ASSERT (s != NULL); + + /* We must generate a R_VAX_COPY reloc to tell the dynamic linker to + copy the initial value out of the dynamic object and into the + runtime process image. We need to remember the offset into the + .rela.bss section we are going to use. */ + if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) + { + asection *srel; + + srel = bfd_get_linker_section (dynobj, ".rela.bss"); + BFD_ASSERT (srel != NULL); + srel->size += sizeof (Elf32_External_Rela); + h->needs_copy = 1; + } + + return _bfd_elf_adjust_dynamic_copy (h, s); +} + +/* This function is called via elf_link_hash_traverse. It resets GOT + and PLT (.GOT) reference counts back to -1 so normal PC32 relocation + will be done. */ + +static bfd_boolean +elf_vax_discard_got_entries (struct elf_link_hash_entry *h, + void *infoptr ATTRIBUTE_UNUSED) +{ + h->got.refcount = -1; + h->plt.refcount = -1; + + return TRUE; +} + +/* Discard unused dynamic data if this is a static link. */ + +static bfd_boolean +elf_vax_always_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED, + struct bfd_link_info *info) +{ + bfd *dynobj; + asection *s; + + dynobj = elf_hash_table (info)->dynobj; + + if (dynobj && !elf_hash_table (info)->dynamic_sections_created) + { + /* We may have created entries in the .rela.got and .got sections. + However, if we are not creating the dynamic sections, we will + not actually use these entries. Reset the size of .rela.got + and .got, which will cause them to get stripped from the output + file below. */ + s = bfd_get_linker_section (dynobj, ".rela.got"); + if (s != NULL) + s->size = 0; + s = bfd_get_linker_section (dynobj, ".got.plt"); + if (s != NULL) + s->size = 0; + s = bfd_get_linker_section (dynobj, ".got"); + if (s != NULL) + s->size = 0; + } + + /* If this is a static link, we need to discard all the got entries we've + recorded. */ + if (!dynobj || !elf_hash_table (info)->dynamic_sections_created) + elf_link_hash_traverse (elf_hash_table (info), + elf_vax_discard_got_entries, + info); + + return TRUE; +} + +/* Set the sizes of the dynamic sections. */ + +static bfd_boolean +elf_vax_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) +{ + bfd *dynobj; + asection *s; + bfd_boolean plt; + bfd_boolean relocs; + bfd_boolean reltext; + + dynobj = elf_hash_table (info)->dynobj; + BFD_ASSERT (dynobj != NULL); + + if (elf_hash_table (info)->dynamic_sections_created) + { + /* Set the contents of the .interp section to the interpreter. */ + if (info->executable) + { + s = bfd_get_linker_section (dynobj, ".interp"); + BFD_ASSERT (s != NULL); + s->size = sizeof ELF_DYNAMIC_INTERPRETER; + s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; + } + } + + /* If this is a -Bsymbolic shared link, then we need to discard all PC + relative relocs against symbols defined in a regular object. We + allocated space for them in the check_relocs routine, but we will not + fill them in in the relocate_section routine. */ + if (info->shared && info->symbolic) + elf_vax_link_hash_traverse (elf_hash_table (info), + elf_vax_discard_copies, + NULL); + + /* If this is a -Bsymbolic shared link, we need to discard all the got + entries we've recorded. Otherwise, we need to instantiate (allocate + space for them). */ + elf_link_hash_traverse (elf_hash_table (info), + elf_vax_instantiate_got_entries, + info); + + /* The check_relocs and adjust_dynamic_symbol entry points have + determined the sizes of the various dynamic sections. Allocate + memory for them. */ + plt = FALSE; + relocs = FALSE; + reltext = FALSE; + for (s = dynobj->sections; s != NULL; s = s->next) + { + const char *name; + + if ((s->flags & SEC_LINKER_CREATED) == 0) + continue; + + /* It's OK to base decisions on the section name, because none + of the dynobj section names depend upon the input files. */ + name = bfd_get_section_name (dynobj, s); + + if (strcmp (name, ".plt") == 0) + { + /* Remember whether there is a PLT. */ + plt = s->size != 0; + } + else if (CONST_STRNEQ (name, ".rela")) + { + if (s->size != 0) + { + asection *target; + + /* Remember whether there are any reloc sections other + than .rela.plt. */ + if (strcmp (name, ".rela.plt") != 0) + { + const char *outname; + + relocs = TRUE; + + /* If this relocation section applies to a read only + section, then we probably need a DT_TEXTREL + entry. .rela.plt is actually associated with + .got.plt, which is never readonly. */ + outname = bfd_get_section_name (output_bfd, + s->output_section); + target = bfd_get_section_by_name (output_bfd, outname + 5); + if (target != NULL + && (target->flags & SEC_READONLY) != 0 + && (target->flags & SEC_ALLOC) != 0) + reltext = 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 if (! CONST_STRNEQ (name, ".got") + && strcmp (name, ".dynbss") != 0) + { + /* 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 .rela.bss and + .rela.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. */ + s->flags |= SEC_EXCLUDE; + continue; + } + + if ((s->flags & SEC_HAS_CONTENTS) == 0) + continue; + + /* Allocate memory for the section contents. */ + s->contents = (bfd_byte *) bfd_alloc (dynobj, s->size); + if (s->contents == NULL) + return FALSE; + } + + if (elf_hash_table (info)->dynamic_sections_created) + { + /* Add some entries to the .dynamic section. We fill in the + values later, in elf_vax_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->shared) + { + if (!add_dynamic_entry (DT_DEBUG, 0)) + return FALSE; + } + + if (plt) + { + if (!add_dynamic_entry (DT_PLTGOT, 0) + || !add_dynamic_entry (DT_PLTRELSZ, 0) + || !add_dynamic_entry (DT_PLTREL, DT_RELA) + || !add_dynamic_entry (DT_JMPREL, 0)) + return FALSE; + } + + if (relocs) + { + if (!add_dynamic_entry (DT_RELA, 0) + || !add_dynamic_entry (DT_RELASZ, 0) + || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela))) + return FALSE; + } + + if (reltext || (info->flags & DF_TEXTREL) != 0) + { + if (!add_dynamic_entry (DT_TEXTREL, 0)) + return FALSE; + } + } +#undef add_dynamic_entry + + return TRUE; +} + +/* This function is called via elf_vax_link_hash_traverse if we are + creating a shared object with -Bsymbolic. It discards the space + allocated to copy PC relative relocs against symbols which are defined + in regular objects. We allocated space for them in the check_relocs + routine, but we won't fill them in in the relocate_section routine. */ + +static bfd_boolean +elf_vax_discard_copies (struct elf_vax_link_hash_entry *h, + void * ignore ATTRIBUTE_UNUSED) +{ + struct elf_vax_pcrel_relocs_copied *s; + + /* We only discard relocs for symbols defined in a regular object. */ + if (!h->root.def_regular) + return TRUE; + + for (s = h->pcrel_relocs_copied; s != NULL; s = s->next) + s->section->size -= s->count * sizeof (Elf32_External_Rela); + + return TRUE; +} + +/* This function is called via elf_link_hash_traverse. It looks for + entries that have GOT or PLT (.GOT) references. If creating a shared + object with -Bsymbolic, or the symbol has been forced local, then it + resets the reference count back to -1 so normal PC32 relocation will + be done. Otherwise space in the .got and .rela.got will be reserved + for the symbol. */ + +static bfd_boolean +elf_vax_instantiate_got_entries (struct elf_link_hash_entry *h, void * infoptr) +{ + struct bfd_link_info *info = (struct bfd_link_info *) infoptr; + bfd *dynobj; + asection *sgot; + asection *srelgot; + + /* We don't care about non-GOT (and non-PLT) entries. */ + if (h->got.refcount <= 0 && h->plt.refcount <= 0) + return TRUE; + + dynobj = elf_hash_table (info)->dynobj; + BFD_ASSERT (dynobj != NULL); + + sgot = bfd_get_linker_section (dynobj, ".got"); + srelgot = bfd_get_linker_section (dynobj, ".rela.got"); + + if (SYMBOL_REFERENCES_LOCAL (info, h)) + { + h->got.refcount = -1; + h->plt.refcount = -1; + } + else if (h->got.refcount > 0) + { + /* Make sure this symbol is output as a dynamic symbol. */ + if (h->dynindx == -1) + { + if (!bfd_elf_link_record_dynamic_symbol (info, h)) + return FALSE; + } + + /* Allocate space in the .got and .rela.got sections. */ + sgot->size += 4; + srelgot->size += sizeof (Elf32_External_Rela); + } + + return TRUE; +} + +/* Relocate an VAX ELF section. */ + +static bfd_boolean +elf_vax_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) +{ + bfd *dynobj; + Elf_Internal_Shdr *symtab_hdr; + struct elf_link_hash_entry **sym_hashes; + bfd_vma plt_index; + bfd_vma got_offset; + asection *sgot; + asection *splt; + asection *sgotplt; + asection *sreloc; + Elf_Internal_Rela *rel; + Elf_Internal_Rela *relend; + + dynobj = elf_hash_table (info)->dynobj; + symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; + sym_hashes = elf_sym_hashes (input_bfd); + + sgot = NULL; + splt = NULL; + sgotplt = NULL; + sreloc = NULL; + + rel = relocs; + relend = relocs + input_section->reloc_count; + for (; rel < relend; rel++) + { + 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 relocation; + bfd_reloc_status_type r; + + r_type = ELF32_R_TYPE (rel->r_info); + if (r_type < 0 || r_type >= (int) R_VAX_max) + { + bfd_set_error (bfd_error_bad_value); + return FALSE; + } + howto = howto_table + r_type; + + r_symndx = ELF32_R_SYM (rel->r_info); + h = NULL; + sym = NULL; + sec = NULL; + if (r_symndx < symtab_hdr->sh_info) + { + sym = local_syms + r_symndx; + sec = local_sections[r_symndx]; + relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); + } + else + { + bfd_boolean unresolved_reloc; + bfd_boolean warned; + + RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, + r_symndx, symtab_hdr, sym_hashes, + h, sec, relocation, + unresolved_reloc, warned); + + if ((h->root.type == bfd_link_hash_defined + || h->root.type == bfd_link_hash_defweak) + && ((r_type == R_VAX_PLT32 + && h->plt.offset != (bfd_vma) -1 + && !h->forced_local + && elf_hash_table (info)->dynamic_sections_created) + || (r_type == R_VAX_GOT32 + && h->got.offset != (bfd_vma) -1 + && !h->forced_local + && elf_hash_table (info)->dynamic_sections_created + && (! info->shared + || (! info->symbolic && h->dynindx != -1) + || !h->def_regular)) + || (info->shared + && ((! info->symbolic && h->dynindx != -1) + || !h->def_regular) + && ((input_section->flags & SEC_ALLOC) != 0 + /* DWARF will emit R_VAX_32 relocations in its + sections against symbols defined externally + in shared libraries. We can't do anything + with them here. */ + + || ((input_section->flags & SEC_DEBUGGING) != 0 + && h->def_dynamic)) + && (r_type == R_VAX_8 + || r_type == R_VAX_16 + || r_type == R_VAX_32)))) + /* In these cases, we don't need the relocation + value. We check specially because in some + obscure cases sec->output_section will be NULL. */ + relocation = 0; + } + + 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; + + switch (r_type) + { + case R_VAX_GOT32: + /* Relocation is to the address of the entry for this symbol + in the global offset table. */ + + /* Resolve a GOTxx reloc against a local symbol directly, + without using the global offset table. */ + if (h == NULL + || h->got.offset == (bfd_vma) -1) + break; + + { + bfd_vma off; + + if (sgot == NULL) + { + sgot = bfd_get_linker_section (dynobj, ".got"); + BFD_ASSERT (sgot != NULL); + } + + off = h->got.offset; + BFD_ASSERT (off < sgot->size); + + bfd_put_32 (output_bfd, rel->r_addend, sgot->contents + off); + + relocation = sgot->output_offset + off; + /* The GOT relocation uses the addend. */ + rel->r_addend = 0; + + /* Change the reference to be indirect. */ + contents[rel->r_offset - 1] |= 0x10; + relocation += sgot->output_section->vma; + } + break; + + case R_VAX_PC32: + /* If we are creating an executable and the function this + reloc refers to is in a shared lib, then we made a PLT + entry for this symbol and need to handle the reloc like + a PLT reloc. */ + if (info->shared) + goto r_vax_pc32_shared; + /* Fall through. */ + case R_VAX_PLT32: + /* Relocation is to the entry for this symbol in the + procedure linkage table. */ + + /* Resolve a PLTxx reloc against a local symbol directly, + without using the procedure linkage table. */ + if (h == NULL + || h->plt.offset == (bfd_vma) -1) + break; + + if (splt == NULL) + { + splt = bfd_get_linker_section (dynobj, ".plt"); + BFD_ASSERT (splt != NULL); + } + + if (sgotplt == NULL) + { + sgotplt = bfd_get_linker_section (dynobj, ".got.plt"); + BFD_ASSERT (sgotplt != NULL); + } + + plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; + + /* Get the offset into the .got table of the entry that + corresponds to this function. Each .got entry is 4 bytes. + The first two are reserved. */ + got_offset = (plt_index + 3) * 4; + + /* We want the relocation to point into the .got.plt instead + of the plt itself. */ + relocation = (sgotplt->output_section->vma + + sgotplt->output_offset + + got_offset); + contents[rel->r_offset-1] |= 0x10; /* make indirect */ + if (rel->r_addend == 2) + { + h->plt.offset |= 1; + } + else if (rel->r_addend != 0) + (*_bfd_error_handler) + (_("%s: warning: PLT addend of %d to `%s' from %s section ignored"), + bfd_get_filename (input_bfd), rel->r_addend, + h->root.root.string, + bfd_get_section_name (input_bfd, input_section)); + rel->r_addend = 0; + + break; + + case R_VAX_PC8: + case R_VAX_PC16: + r_vax_pc32_shared: + if (h == NULL + || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT + || h->forced_local) + break; + /* Fall through. */ + case R_VAX_8: + case R_VAX_16: + case R_VAX_32: + if (info->shared + && r_symndx != STN_UNDEF + && (input_section->flags & SEC_ALLOC) != 0 + && ((r_type != R_VAX_PC8 + && r_type != R_VAX_PC16 + && r_type != R_VAX_PC32) + || ((input_section->flags & SEC_CODE) + && (!info->symbolic + || (!h->def_regular && h->type != STT_SECTION))))) + { + Elf_Internal_Rela outrel; + bfd_byte *loc; + bfd_boolean skip, relocate; + + /* When generating a shared object, these relocations + are copied into the output file to be resolved at run + time. */ + if (sreloc == NULL) + { + sreloc = _bfd_elf_get_dynamic_reloc_section + (input_bfd, input_section, /*rela?*/ TRUE); + if (sreloc == NULL) + return FALSE; + } + + 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; + 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); + /* h->dynindx may be -1 if the symbol was marked to + become local. */ + else if (h != NULL + && ((! info->symbolic && h->dynindx != -1) + || !h->def_regular)) + { + BFD_ASSERT (h->dynindx != -1); + outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); + outrel.r_addend = relocation + rel->r_addend; + } + else + { + if (r_type == R_VAX_32) + { + relocate = TRUE; + outrel.r_info = ELF32_R_INFO (0, R_VAX_RELATIVE); + BFD_ASSERT (bfd_get_signed_32 (input_bfd, + &contents[rel->r_offset]) == 0); + outrel.r_addend = relocation + rel->r_addend; + } + else + { + long indx; + + if (bfd_is_abs_section (sec)) + indx = 0; + else if (sec == NULL || sec->owner == NULL) + { + bfd_set_error (bfd_error_bad_value); + return FALSE; + } + else + { + asection *osec; + + /* We are turning this relocation into one + against a section symbol. It would be + proper to subtract the symbol's value, + osec->vma, from the emitted reloc addend, + but ld.so expects buggy relocs. */ + osec = sec->output_section; + indx = elf_section_data (osec)->dynindx; + if (indx == 0) + { + struct elf_link_hash_table *htab; + htab = elf_hash_table (info); + osec = htab->text_index_section; + indx = elf_section_data (osec)->dynindx; + } + BFD_ASSERT (indx != 0); + } + + outrel.r_info = ELF32_R_INFO (indx, r_type); + outrel.r_addend = relocation + rel->r_addend; + } + } + + if ((input_section->flags & SEC_CODE) != 0 + || (ELF32_R_TYPE (outrel.r_info) != R_VAX_32 + && ELF32_R_TYPE (outrel.r_info) != R_VAX_RELATIVE + && ELF32_R_TYPE (outrel.r_info) != R_VAX_COPY + && ELF32_R_TYPE (outrel.r_info) != R_VAX_JMP_SLOT + && ELF32_R_TYPE (outrel.r_info) != R_VAX_GLOB_DAT)) + { + if (h != NULL) + (*_bfd_error_handler) + (_("%s: warning: %s relocation against symbol `%s' from %s section"), + bfd_get_filename (input_bfd), howto->name, + h->root.root.string, + bfd_get_section_name (input_bfd, input_section)); + else + (*_bfd_error_handler) + (_("%s: warning: %s relocation to 0x%x from %s section"), + bfd_get_filename (input_bfd), howto->name, + outrel.r_addend, + bfd_get_section_name (input_bfd, input_section)); + } + loc = sreloc->contents; + loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); + bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); + + /* This reloc will be computed at runtime, so there's no + need to do anything now, except for R_VAX_32 + relocations that have been turned into + R_VAX_RELATIVE. */ + if (!relocate) + continue; + } + + break; + + case R_VAX_GNU_VTINHERIT: + case R_VAX_GNU_VTENTRY: + /* These are no-ops in the end. */ + continue; + + default: + break; + } + + /* VAX PCREL relocations are from the end of relocation, not the start. + So subtract the difference from the relocation amount since we can't + add it to the offset. */ + if (howto->pc_relative && howto->pcrel_offset) + relocation -= bfd_get_reloc_size(howto); + + r = _bfd_final_link_relocate (howto, input_bfd, input_section, + contents, rel->r_offset, + relocation, rel->r_addend); + + if (r != bfd_reloc_ok) + { + switch (r) + { + default: + case bfd_reloc_outofrange: + abort (); + case bfd_reloc_overflow: + { + const char *name; + + if (h != NULL) + name = NULL; + 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 (!(info->callbacks->reloc_overflow + (info, (h ? &h->root : NULL), name, howto->name, + (bfd_vma) 0, input_bfd, input_section, + rel->r_offset))) + return FALSE; + } + break; + } + } + } + + return TRUE; +} + +/* Finish up dynamic symbol handling. We set the contents of various + dynamic sections here. */ + +static bfd_boolean +elf_vax_finish_dynamic_symbol (bfd *output_bfd, struct bfd_link_info *info, + struct elf_link_hash_entry *h, + Elf_Internal_Sym *sym) +{ + bfd *dynobj; + + dynobj = elf_hash_table (info)->dynobj; + + if (h->plt.offset != (bfd_vma) -1) + { + asection *splt; + asection *sgot; + asection *srela; + bfd_vma plt_index; + bfd_vma got_offset; + bfd_vma addend; + Elf_Internal_Rela rela; + bfd_byte *loc; + + /* This symbol has an entry in the procedure linkage table. Set + it up. */ + BFD_ASSERT (h->dynindx != -1); + + splt = bfd_get_linker_section (dynobj, ".plt"); + sgot = bfd_get_linker_section (dynobj, ".got.plt"); + srela = bfd_get_linker_section (dynobj, ".rela.plt"); + BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL); + + addend = 2 * (h->plt.offset & 1); + h->plt.offset &= ~1; + + /* 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. */ + plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; + + /* Get the offset into the .got table of the entry that + corresponds to this function. Each .got entry is 4 bytes. + The first two are reserved. */ + got_offset = (plt_index + 3) * 4; + + /* Fill in the entry in the procedure linkage table. */ + memcpy (splt->contents + h->plt.offset, elf_vax_plt_entry, + PLT_ENTRY_SIZE); + + /* The offset is relative to the first extension word. */ + bfd_put_32 (output_bfd, + -(h->plt.offset + 8), + splt->contents + h->plt.offset + 4); + + bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela), + splt->contents + h->plt.offset + 8); + + /* Fill in the entry in the global offset table. */ + bfd_put_32 (output_bfd, + (splt->output_section->vma + + splt->output_offset + + h->plt.offset) + addend, + sgot->contents + got_offset); + + /* Fill in the entry in the .rela.plt section. */ + rela.r_offset = (sgot->output_section->vma + + sgot->output_offset + + got_offset); + rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_JMP_SLOT); + rela.r_addend = addend; + loc = srela->contents + plt_index * sizeof (Elf32_External_Rela); + bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); + + if (!h->def_regular) + { + /* Mark the symbol as undefined, rather than as defined in + the .plt section. Leave the value alone. */ + sym->st_shndx = SHN_UNDEF; + } + } + + if (h->got.offset != (bfd_vma) -1) + { + asection *sgot; + asection *srela; + Elf_Internal_Rela rela; + bfd_byte *loc; + + /* This symbol has an entry in the global offset table. Set it + up. */ + sgot = bfd_get_linker_section (dynobj, ".got"); + srela = bfd_get_linker_section (dynobj, ".rela.got"); + BFD_ASSERT (sgot != NULL && srela != NULL); + + rela.r_offset = (sgot->output_section->vma + + sgot->output_offset + + h->got.offset); + rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_GLOB_DAT); + rela.r_addend = bfd_get_signed_32 (output_bfd, + sgot->contents + h->got.offset); + + loc = srela->contents; + loc += srela->reloc_count++ * sizeof (Elf32_External_Rela); + bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); + } + + if (h->needs_copy) + { + asection *s; + Elf_Internal_Rela rela; + bfd_byte *loc; + + /* This symbol needs a copy reloc. Set it up. */ + BFD_ASSERT (h->dynindx != -1 + && (h->root.type == bfd_link_hash_defined + || h->root.type == bfd_link_hash_defweak)); + + s = bfd_get_linker_section (dynobj, ".rela.bss"); + BFD_ASSERT (s != NULL); + + rela.r_offset = (h->root.u.def.value + + h->root.u.def.section->output_section->vma + + h->root.u.def.section->output_offset); + rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_COPY); + rela.r_addend = 0; + loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela); + bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); + } + + /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ + if (h == elf_hash_table (info)->hdynamic + || h == elf_hash_table (info)->hgot) + sym->st_shndx = SHN_ABS; + + return TRUE; +} + +/* Finish up the dynamic sections. */ + +static bfd_boolean +elf_vax_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) +{ + bfd *dynobj; + asection *sgot; + asection *sdyn; + + dynobj = elf_hash_table (info)->dynobj; + + sgot = bfd_get_linker_section (dynobj, ".got.plt"); + BFD_ASSERT (sgot != NULL); + sdyn = bfd_get_linker_section (dynobj, ".dynamic"); + + if (elf_hash_table (info)->dynamic_sections_created) + { + asection *splt; + Elf32_External_Dyn *dyncon, *dynconend; + + splt = bfd_get_linker_section (dynobj, ".plt"); + BFD_ASSERT (splt != NULL && sdyn != NULL); + + dyncon = (Elf32_External_Dyn *) sdyn->contents; + dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); + for (; dyncon < dynconend; dyncon++) + { + Elf_Internal_Dyn dyn; + const char *name; + asection *s; + + bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); + + switch (dyn.d_tag) + { + default: + break; + + case DT_PLTGOT: + name = ".got"; + goto get_vma; + case DT_JMPREL: + name = ".rela.plt"; + get_vma: + s = bfd_get_section_by_name (output_bfd, name); + BFD_ASSERT (s != NULL); + dyn.d_un.d_ptr = s->vma; + bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); + break; + + case DT_PLTRELSZ: + s = bfd_get_section_by_name (output_bfd, ".rela.plt"); + BFD_ASSERT (s != NULL); + dyn.d_un.d_val = s->size; + bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); + break; + + case DT_RELASZ: + /* The procedure linkage table relocs (DT_JMPREL) should + not be included in the overall relocs (DT_RELA). + Therefore, we override the DT_RELASZ entry here to + make it not include the JMPREL relocs. Since the + linker script arranges for .rela.plt to follow all + other relocation sections, we don't have to worry + about changing the DT_RELA entry. */ + s = bfd_get_section_by_name (output_bfd, ".rela.plt"); + if (s != NULL) + dyn.d_un.d_val -= s->size; + bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); + break; + } + } + + /* Fill in the first entry in the procedure linkage table. */ + if (splt->size > 0) + { + memcpy (splt->contents, elf_vax_plt0_entry, PLT_ENTRY_SIZE); + bfd_put_32 (output_bfd, + (sgot->output_section->vma + + sgot->output_offset + 4 + - (splt->output_section->vma + 6)), + splt->contents + 2); + bfd_put_32 (output_bfd, + (sgot->output_section->vma + + sgot->output_offset + 8 + - (splt->output_section->vma + 12)), + splt->contents + 8); + elf_section_data (splt->output_section)->this_hdr.sh_entsize + = PLT_ENTRY_SIZE; + } + } + + /* Fill in the first three entries in the global offset table. */ + if (sgot->size > 0) + { + if (sdyn == NULL) + bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); + else + bfd_put_32 (output_bfd, + sdyn->output_section->vma + sdyn->output_offset, + sgot->contents); + bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); + bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); + } + + if (elf_section_data (sgot->output_section) != NULL) + elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; + + return TRUE; +} + +static enum elf_reloc_type_class +elf_vax_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED, + const asection *rel_sec ATTRIBUTE_UNUSED, + const Elf_Internal_Rela *rela) +{ + switch ((int) ELF32_R_TYPE (rela->r_info)) + { + case R_VAX_RELATIVE: + return reloc_class_relative; + case R_VAX_JMP_SLOT: + return reloc_class_plt; + case R_VAX_COPY: + return reloc_class_copy; + default: + return reloc_class_normal; + } +} + +static bfd_vma +elf_vax_plt_sym_val (bfd_vma i, const asection *plt, + const arelent *rel ATTRIBUTE_UNUSED) +{ + return plt->vma + (i + 1) * PLT_ENTRY_SIZE; +} + +#define TARGET_LITTLE_SYM bfd_elf32_vax_vec +#define TARGET_LITTLE_NAME "elf32-vax" +#define ELF_MACHINE_CODE EM_VAX +#define ELF_MAXPAGESIZE 0x1000 + +#define elf_backend_create_dynamic_sections \ + _bfd_elf_create_dynamic_sections +#define bfd_elf32_bfd_link_hash_table_create \ + elf_vax_link_hash_table_create +#define bfd_elf32_bfd_final_link bfd_elf_gc_common_final_link + +#define elf_backend_check_relocs elf_vax_check_relocs +#define elf_backend_adjust_dynamic_symbol \ + elf_vax_adjust_dynamic_symbol +#define elf_backend_always_size_sections \ + elf_vax_always_size_sections +#define elf_backend_size_dynamic_sections \ + elf_vax_size_dynamic_sections +#define elf_backend_init_index_section _bfd_elf_init_1_index_section +#define elf_backend_relocate_section elf_vax_relocate_section +#define elf_backend_finish_dynamic_symbol \ + elf_vax_finish_dynamic_symbol +#define elf_backend_finish_dynamic_sections \ + elf_vax_finish_dynamic_sections +#define elf_backend_reloc_type_class elf_vax_reloc_type_class +#define elf_backend_gc_mark_hook elf_vax_gc_mark_hook +#define elf_backend_gc_sweep_hook elf_vax_gc_sweep_hook +#define elf_backend_plt_sym_val elf_vax_plt_sym_val +#define bfd_elf32_bfd_merge_private_bfd_data \ + elf32_vax_merge_private_bfd_data +#define bfd_elf32_bfd_set_private_flags \ + elf32_vax_set_private_flags +#define bfd_elf32_bfd_print_private_bfd_data \ + elf32_vax_print_private_bfd_data + +#define elf_backend_can_gc_sections 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 16 +#define elf_backend_rela_normal 1 + +#include "elf32-target.h" |