| /* VAX series support for 32-bit ELF |
| Copyright (C) 1993-2021 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 bool 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 bool elf_vax_check_relocs (bfd *, struct bfd_link_info *, |
| asection *, const Elf_Internal_Rela *); |
| static bool elf_vax_adjust_dynamic_symbol (struct bfd_link_info *, |
| struct elf_link_hash_entry *); |
| static bool elf_vax_size_dynamic_sections (bfd *, struct bfd_link_info *); |
| static int elf_vax_relocate_section (bfd *, struct bfd_link_info *, |
| bfd *, asection *, bfd_byte *, |
| Elf_Internal_Rela *, |
| Elf_Internal_Sym *, asection **); |
| static bool elf_vax_finish_dynamic_symbol (bfd *, struct bfd_link_info *, |
| struct elf_link_hash_entry *, |
| Elf_Internal_Sym *); |
| static bool 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 bool elf32_vax_set_private_flags (bfd *, flagword); |
| static bool elf32_vax_print_private_bfd_data (bfd *, void *); |
| |
| static reloc_howto_type howto_table[] = { |
| HOWTO (R_VAX_NONE, /* type */ |
| 0, /* rightshift */ |
| 3, /* 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 bool |
| rtype_to_howto (bfd *abfd, arelent *cache_ptr, Elf_Internal_Rela *dst) |
| { |
| unsigned int r_type; |
| |
| r_type = ELF32_R_TYPE (dst->r_info); |
| if (r_type >= R_VAX_max) |
| { |
| /* xgettext:c-format */ |
| _bfd_error_handler (_("%pB: unsupported relocation type %#x"), |
| abfd, r_type); |
| bfd_set_error (bfd_error_bad_value); |
| return false; |
| } |
| cache_ptr->howto = &howto_table[r_type]; |
| return true; |
| } |
| |
| #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 bool elf_vax_discard_copies (struct elf_vax_link_hash_entry *, |
| void *); |
| |
| /* Declare this now that the above structures are defined. */ |
| |
| static bool 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), \ |
| (bool (*) (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; |
| size_t 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 bool |
| 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 bool |
| elf32_vax_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info) |
| { |
| bfd *obfd = info->output_bfd; |
| 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 bool |
| 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 bool |
| 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 *sreloc; |
| |
| if (bfd_link_relocatable (info)) |
| return true; |
| |
| dynobj = elf_hash_table (info)->dynobj; |
| symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| sym_hashes = elf_sym_hashes (abfd); |
| |
| 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; |
| } |
| |
| 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 (SYMBOL_REFERENCES_LOCAL (info, h) |
| || 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 (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 |
| /* xgettext:c-format */ |
| (_("%pB: warning: GOT addend of %" PRId64 " to `%s' does" |
| " not match previous GOT addend of %" PRId64), |
| abfd, (int64_t) rel->r_addend, h->root.root.string, |
| (int64_t) 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 (!(bfd_link_pic (info) |
| && (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++; |
| } |
| |
| /* Non-GOT reference may need a copy reloc in executable or |
| a dynamic reloc in shared library. */ |
| if (h != NULL) |
| h->non_got_ref = 1; |
| |
| /* If we are creating a shared library, we need to copy the |
| reloc into the shared library. */ |
| if (bfd_link_pic (info) |
| && (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: |
| if (!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); |
| } |
| |
| /* 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 bool |
| 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->is_weakalias |
| || (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 = elf_hash_table (info)->splt; |
| 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 (!bfd_link_pic (info) |
| && !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 = elf_hash_table (info)->sgotplt; |
| BFD_ASSERT (s != NULL); |
| s->size += 4; |
| |
| /* We also need to make an entry in the .rela.plt section. */ |
| |
| s = elf_hash_table (info)->srelplt; |
| 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->is_weakalias) |
| { |
| struct elf_link_hash_entry *def = weakdef (h); |
| BFD_ASSERT (def->root.type == bfd_link_hash_defined); |
| h->root.u.def.section = def->root.u.def.section; |
| h->root.u.def.value = def->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 (bfd_link_pic (info)) |
| return true; |
| |
| /* If there are no references to this symbol that do not use the |
| GOT relocation, we don't need to generate a copy reloc. */ |
| if (!h->non_got_ref) |
| 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 (info, 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 bool |
| 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 bool |
| 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 = elf_hash_table (info)->srelgot; |
| if (s != NULL) |
| s->size = 0; |
| s = elf_hash_table (info)->sgotplt; |
| if (s != NULL) |
| s->size = 0; |
| s = elf_hash_table (info)->sgot; |
| 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 bool |
| elf_vax_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) |
| { |
| bfd *dynobj; |
| asection *s; |
| bool relocs; |
| |
| 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 (bfd_link_executable (info) && !info->nointerp) |
| { |
| 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 (bfd_link_pic (info) && 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. */ |
| relocs = 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_section_name (s); |
| |
| if (strcmp (name, ".plt") == 0) |
| { |
| /* Remember whether there is a PLT. */ |
| ; |
| } |
| else if (startswith (name, ".rela")) |
| { |
| if (s->size != 0) |
| { |
| if (strcmp (name, ".rela.plt") != 0) |
| 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 if (! startswith (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_zalloc (dynobj, s->size); |
| if (s->contents == NULL) |
| return false; |
| } |
| |
| return _bfd_elf_add_dynamic_tags (output_bfd, info, relocs); |
| } |
| |
| /* 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 bool |
| 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 bool |
| 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 = elf_hash_table (info)->sgot; |
| srelgot = elf_hash_table (info)->srelgot; |
| |
| 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 int |
| 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) |
| { |
| 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; |
| |
| 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 |
| { |
| bool unresolved_reloc; |
| bool warned, ignored; |
| |
| RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
| r_symndx, symtab_hdr, sym_hashes, |
| h, sec, relocation, |
| unresolved_reloc, warned, ignored); |
| |
| 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 |
| && (! bfd_link_pic (info) |
| || (! info->symbolic && h->dynindx != -1) |
| || !h->def_regular)) |
| || (bfd_link_pic (info) |
| && ((! 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 (bfd_link_relocatable (info)) |
| 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; |
| |
| sgot = elf_hash_table (info)->sgot; |
| 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 (bfd_link_pic (info)) |
| 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; |
| |
| splt = elf_hash_table (info)->splt; |
| BFD_ASSERT (splt != NULL); |
| |
| sgotplt = elf_hash_table (info)->sgotplt; |
| 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 |
| /* xgettext:c-format */ |
| (_("%pB: warning: PLT addend of %" PRId64 " to `%s'" |
| " from %pA section ignored"), |
| input_bfd, (int64_t) rel->r_addend, h->root.root.string, |
| 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 (bfd_link_pic (info) |
| && 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; |
| bool 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 |
| /* xgettext:c-format */ |
| (_("%pB: warning: %s relocation against symbol `%s'" |
| " from %pA section"), |
| input_bfd, howto->name, h->root.root.string, |
| input_section); |
| else |
| _bfd_error_handler |
| /* xgettext:c-format */ |
| (_("%pB: warning: %s relocation to %#" PRIx64 |
| " from %pA section"), |
| input_bfd, howto->name, (uint64_t) outrel.r_addend, |
| 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 (sec); |
| } |
| info->callbacks->reloc_overflow |
| (info, (h ? &h->root : NULL), name, howto->name, |
| (bfd_vma) 0, input_bfd, input_section, rel->r_offset); |
| } |
| break; |
| } |
| } |
| } |
| |
| return true; |
| } |
| |
| /* Finish up dynamic symbol handling. We set the contents of various |
| dynamic sections here. */ |
| |
| static bool |
| 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 = elf_hash_table (info)->splt; |
| sgot = elf_hash_table (info)->sgotplt; |
| srela = elf_hash_table (info)->srelplt; |
| 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 = elf_hash_table (info)->sgot; |
| srela = elf_hash_table (info)->srelgot; |
| 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 bool |
| 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 = elf_hash_table (info)->sgotplt; |
| 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 = elf_hash_table (info)->splt; |
| 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; |
| asection *s; |
| |
| bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); |
| |
| switch (dyn.d_tag) |
| { |
| default: |
| break; |
| |
| case DT_PLTGOT: |
| s = elf_hash_table (info)->sgotplt; |
| goto get_vma; |
| case DT_JMPREL: |
| s = elf_hash_table (info)->srelplt; |
| get_vma: |
| dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; |
| bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
| break; |
| |
| case DT_PLTRELSZ: |
| s = elf_hash_table (info)->srelplt; |
| 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 vax_elf32_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_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 |
| #define elf_backend_dtrel_excludes_plt 1 |
| |
| #include "elf32-target.h" |