| /* Motorola 68k series support for 32-bit ELF |
| Copyright 1993, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 |
| Free Software Foundation, Inc. |
| |
| This file is part of BFD, the Binary File Descriptor library. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| |
| #include "bfd.h" |
| #include "sysdep.h" |
| #include "bfdlink.h" |
| #include "libbfd.h" |
| #include "elf-bfd.h" |
| #include "elf/m68k.h" |
| |
| static reloc_howto_type *reloc_type_lookup |
| PARAMS ((bfd *, bfd_reloc_code_real_type)); |
| static void rtype_to_howto |
| PARAMS ((bfd *, arelent *, Elf_Internal_Rela *)); |
| static struct bfd_hash_entry *elf_m68k_link_hash_newfunc |
| PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); |
| static struct bfd_link_hash_table *elf_m68k_link_hash_table_create |
| PARAMS ((bfd *)); |
| static bfd_boolean elf_m68k_check_relocs |
| PARAMS ((bfd *, struct bfd_link_info *, asection *, |
| const Elf_Internal_Rela *)); |
| static asection *elf_m68k_gc_mark_hook |
| PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *, |
| struct elf_link_hash_entry *, Elf_Internal_Sym *)); |
| static bfd_boolean elf_m68k_gc_sweep_hook |
| PARAMS ((bfd *, struct bfd_link_info *, asection *, |
| const Elf_Internal_Rela *)); |
| static bfd_boolean elf_m68k_adjust_dynamic_symbol |
| PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); |
| static bfd_boolean elf_m68k_size_dynamic_sections |
| PARAMS ((bfd *, struct bfd_link_info *)); |
| static bfd_boolean elf_m68k_discard_copies |
| PARAMS ((struct elf_link_hash_entry *, PTR)); |
| static bfd_boolean elf_m68k_relocate_section |
| PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, |
| Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); |
| static bfd_boolean elf_m68k_finish_dynamic_symbol |
| PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, |
| Elf_Internal_Sym *)); |
| static bfd_boolean elf_m68k_finish_dynamic_sections |
| PARAMS ((bfd *, struct bfd_link_info *)); |
| |
| static bfd_boolean elf32_m68k_set_private_flags |
| PARAMS ((bfd *, flagword)); |
| static bfd_boolean elf32_m68k_merge_private_bfd_data |
| PARAMS ((bfd *, bfd *)); |
| static bfd_boolean elf32_m68k_print_private_bfd_data |
| PARAMS ((bfd *, PTR)); |
| static enum elf_reloc_type_class elf32_m68k_reloc_type_class |
| PARAMS ((const Elf_Internal_Rela *)); |
| |
| static reloc_howto_type howto_table[] = { |
| HOWTO(R_68K_NONE, 0, 0, 0, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_NONE", FALSE, 0, 0x00000000,FALSE), |
| HOWTO(R_68K_32, 0, 2,32, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_32", FALSE, 0, 0xffffffff,FALSE), |
| HOWTO(R_68K_16, 0, 1,16, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_16", FALSE, 0, 0x0000ffff,FALSE), |
| HOWTO(R_68K_8, 0, 0, 8, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_8", FALSE, 0, 0x000000ff,FALSE), |
| HOWTO(R_68K_PC32, 0, 2,32, TRUE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PC32", FALSE, 0, 0xffffffff,TRUE), |
| HOWTO(R_68K_PC16, 0, 1,16, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC16", FALSE, 0, 0x0000ffff,TRUE), |
| HOWTO(R_68K_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC8", FALSE, 0, 0x000000ff,TRUE), |
| HOWTO(R_68K_GOT32, 0, 2,32, TRUE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32", FALSE, 0, 0xffffffff,TRUE), |
| HOWTO(R_68K_GOT16, 0, 1,16, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16", FALSE, 0, 0x0000ffff,TRUE), |
| HOWTO(R_68K_GOT8, 0, 0, 8, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8", FALSE, 0, 0x000000ff,TRUE), |
| HOWTO(R_68K_GOT32O, 0, 2,32, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32O", FALSE, 0, 0xffffffff,FALSE), |
| HOWTO(R_68K_GOT16O, 0, 1,16, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16O", FALSE, 0, 0x0000ffff,FALSE), |
| HOWTO(R_68K_GOT8O, 0, 0, 8, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8O", FALSE, 0, 0x000000ff,FALSE), |
| HOWTO(R_68K_PLT32, 0, 2,32, TRUE, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32", FALSE, 0, 0xffffffff,TRUE), |
| HOWTO(R_68K_PLT16, 0, 1,16, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16", FALSE, 0, 0x0000ffff,TRUE), |
| HOWTO(R_68K_PLT8, 0, 0, 8, TRUE, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8", FALSE, 0, 0x000000ff,TRUE), |
| HOWTO(R_68K_PLT32O, 0, 2,32, FALSE,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32O", FALSE, 0, 0xffffffff,FALSE), |
| HOWTO(R_68K_PLT16O, 0, 1,16, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16O", FALSE, 0, 0x0000ffff,FALSE), |
| HOWTO(R_68K_PLT8O, 0, 0, 8, FALSE,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8O", FALSE, 0, 0x000000ff,FALSE), |
| HOWTO(R_68K_COPY, 0, 0, 0, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_COPY", FALSE, 0, 0xffffffff,FALSE), |
| HOWTO(R_68K_GLOB_DAT, 0, 2,32, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_GLOB_DAT", FALSE, 0, 0xffffffff,FALSE), |
| HOWTO(R_68K_JMP_SLOT, 0, 2,32, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_JMP_SLOT", FALSE, 0, 0xffffffff,FALSE), |
| HOWTO(R_68K_RELATIVE, 0, 2,32, FALSE,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_RELATIVE", FALSE, 0, 0xffffffff,FALSE), |
| /* GNU extension to record C++ vtable hierarchy. */ |
| HOWTO (R_68K_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_68K_GNU_VTINHERIT", /* name */ |
| FALSE, /* partial_inplace */ |
| 0, /* src_mask */ |
| 0, /* dst_mask */ |
| FALSE), |
| /* GNU extension to record C++ vtable member usage. */ |
| HOWTO (R_68K_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_68K_GNU_VTENTRY", /* name */ |
| FALSE, /* partial_inplace */ |
| 0, /* src_mask */ |
| 0, /* dst_mask */ |
| FALSE), |
| }; |
| |
| static void |
| rtype_to_howto (abfd, cache_ptr, dst) |
| bfd *abfd ATTRIBUTE_UNUSED; |
| arelent *cache_ptr; |
| Elf_Internal_Rela *dst; |
| { |
| BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_68K_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_68K_NONE }, |
| { BFD_RELOC_32, R_68K_32 }, |
| { BFD_RELOC_16, R_68K_16 }, |
| { BFD_RELOC_8, R_68K_8 }, |
| { BFD_RELOC_32_PCREL, R_68K_PC32 }, |
| { BFD_RELOC_16_PCREL, R_68K_PC16 }, |
| { BFD_RELOC_8_PCREL, R_68K_PC8 }, |
| { BFD_RELOC_32_GOT_PCREL, R_68K_GOT32 }, |
| { BFD_RELOC_16_GOT_PCREL, R_68K_GOT16 }, |
| { BFD_RELOC_8_GOT_PCREL, R_68K_GOT8 }, |
| { BFD_RELOC_32_GOTOFF, R_68K_GOT32O }, |
| { BFD_RELOC_16_GOTOFF, R_68K_GOT16O }, |
| { BFD_RELOC_8_GOTOFF, R_68K_GOT8O }, |
| { BFD_RELOC_32_PLT_PCREL, R_68K_PLT32 }, |
| { BFD_RELOC_16_PLT_PCREL, R_68K_PLT16 }, |
| { BFD_RELOC_8_PLT_PCREL, R_68K_PLT8 }, |
| { BFD_RELOC_32_PLTOFF, R_68K_PLT32O }, |
| { BFD_RELOC_16_PLTOFF, R_68K_PLT16O }, |
| { BFD_RELOC_8_PLTOFF, R_68K_PLT8O }, |
| { BFD_RELOC_NONE, R_68K_COPY }, |
| { BFD_RELOC_68K_GLOB_DAT, R_68K_GLOB_DAT }, |
| { BFD_RELOC_68K_JMP_SLOT, R_68K_JMP_SLOT }, |
| { BFD_RELOC_68K_RELATIVE, R_68K_RELATIVE }, |
| { BFD_RELOC_CTOR, R_68K_32 }, |
| { BFD_RELOC_VTABLE_INHERIT, R_68K_GNU_VTINHERIT }, |
| { BFD_RELOC_VTABLE_ENTRY, R_68K_GNU_VTENTRY }, |
| }; |
| |
| static reloc_howto_type * |
| reloc_type_lookup (abfd, code) |
| 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; |
| } |
| |
| #define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup |
| #define ELF_ARCH bfd_arch_m68k |
| |
| /* Functions for the m68k ELF linker. */ |
| |
| /* The name of the dynamic interpreter. This is put in the .interp |
| section. */ |
| |
| #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" |
| |
| /* The size in bytes of an entry in the procedure linkage table. */ |
| |
| #define PLT_ENTRY_SIZE 20 |
| |
| /* The first entry in a procedure linkage table looks like this. See |
| the SVR4 ABI m68k supplement to see how this works. */ |
| |
| static const bfd_byte elf_m68k_plt0_entry[PLT_ENTRY_SIZE] = |
| { |
| 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */ |
| 0, 0, 0, 0, /* replaced with offset to .got + 4. */ |
| 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,addr]) */ |
| 0, 0, 0, 0, /* replaced with offset to .got + 8. */ |
| 0, 0, 0, 0 /* pad out to 20 bytes. */ |
| }; |
| |
| /* Subsequent entries in a procedure linkage table look like this. */ |
| |
| static const bfd_byte elf_m68k_plt_entry[PLT_ENTRY_SIZE] = |
| { |
| 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,symbol@GOTPC]) */ |
| 0, 0, 0, 0, /* replaced with offset to symbol's .got entry. */ |
| 0x2f, 0x3c, /* move.l #offset,-(%sp) */ |
| 0, 0, 0, 0, /* replaced with offset into relocation table. */ |
| 0x60, 0xff, /* bra.l .plt */ |
| 0, 0, 0, 0 /* replaced with offset to start of .plt. */ |
| }; |
| |
| #define CPU32_FLAG(abfd) (elf_elfheader (abfd)->e_flags & EF_CPU32) |
| |
| #define PLT_CPU32_ENTRY_SIZE 24 |
| /* Procedure linkage table entries for the cpu32 */ |
| static const bfd_byte elf_cpu32_plt0_entry[PLT_CPU32_ENTRY_SIZE] = |
| { |
| 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */ |
| 0, 0, 0, 0, /* replaced with offset to .got + 4. */ |
| 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */ |
| 0, 0, 0, 0, /* replace with offset to .got +8. */ |
| 0x4e, 0xd1, /* jmp %a1@ */ |
| 0, 0, 0, 0, /* pad out to 24 bytes. */ |
| 0, 0 |
| }; |
| |
| static const bfd_byte elf_cpu32_plt_entry[PLT_CPU32_ENTRY_SIZE] = |
| { |
| 0x22, 0x7b, 0x01, 0x70, /* moveal %pc@(0xc), %a1 */ |
| 0, 0, 0, 0, /* replaced with offset to symbol's .got entry. */ |
| 0x4e, 0xd1, /* jmp %a1@ */ |
| 0x2f, 0x3c, /* move.l #offset,-(%sp) */ |
| 0, 0, 0, 0, /* replaced with offset into relocation table. */ |
| 0x60, 0xff, /* bra.l .plt */ |
| 0, 0, 0, 0, /* replaced with offset to start of .plt. */ |
| 0, 0 |
| }; |
| |
| /* The m68k 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_m68k_pcrel_relocs_copied |
| { |
| /* Next section. */ |
| struct elf_m68k_pcrel_relocs_copied *next; |
| /* A section in dynobj. */ |
| asection *section; |
| /* Number of relocs copied in this section. */ |
| bfd_size_type count; |
| }; |
| |
| /* m68k ELF linker hash entry. */ |
| |
| struct elf_m68k_link_hash_entry |
| { |
| struct elf_link_hash_entry root; |
| |
| /* Number of PC relative relocs copied for this symbol. */ |
| struct elf_m68k_pcrel_relocs_copied *pcrel_relocs_copied; |
| }; |
| |
| #define elf_m68k_hash_entry(ent) ((struct elf_m68k_link_hash_entry *) (ent)) |
| |
| /* m68k ELF linker hash table. */ |
| |
| struct elf_m68k_link_hash_table |
| { |
| struct elf_link_hash_table root; |
| |
| /* Small local sym to section mapping cache. */ |
| struct sym_sec_cache sym_sec; |
| }; |
| |
| /* Get the m68k ELF linker hash table from a link_info structure. */ |
| |
| #define elf_m68k_hash_table(p) \ |
| ((struct elf_m68k_link_hash_table *) (p)->hash) |
| |
| /* Create an entry in an m68k ELF linker hash table. */ |
| |
| static struct bfd_hash_entry * |
| elf_m68k_link_hash_newfunc (entry, table, string) |
| struct bfd_hash_entry *entry; |
| struct bfd_hash_table *table; |
| const char *string; |
| { |
| struct bfd_hash_entry *ret = entry; |
| |
| /* Allocate the structure if it has not already been allocated by a |
| subclass. */ |
| if (ret == NULL) |
| ret = bfd_hash_allocate (table, |
| sizeof (struct elf_m68k_link_hash_entry)); |
| if (ret == NULL) |
| return ret; |
| |
| /* Call the allocation method of the superclass. */ |
| ret = _bfd_elf_link_hash_newfunc (ret, table, string); |
| if (ret != NULL) |
| elf_m68k_hash_entry (ret)->pcrel_relocs_copied = NULL; |
| |
| return ret; |
| } |
| |
| /* Create an m68k ELF linker hash table. */ |
| |
| static struct bfd_link_hash_table * |
| elf_m68k_link_hash_table_create (abfd) |
| bfd *abfd; |
| { |
| struct elf_m68k_link_hash_table *ret; |
| bfd_size_type amt = sizeof (struct elf_m68k_link_hash_table); |
| |
| ret = (struct elf_m68k_link_hash_table *) bfd_malloc (amt); |
| if (ret == (struct elf_m68k_link_hash_table *) NULL) |
| return NULL; |
| |
| if (! _bfd_elf_link_hash_table_init (&ret->root, abfd, |
| elf_m68k_link_hash_newfunc)) |
| { |
| free (ret); |
| return NULL; |
| } |
| |
| ret->sym_sec.abfd = NULL; |
| |
| return &ret->root.root; |
| } |
| |
| /* Keep m68k-specific flags in the ELF header. */ |
| static bfd_boolean |
| elf32_m68k_set_private_flags (abfd, 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_m68k_merge_private_bfd_data (ibfd, obfd) |
| bfd *ibfd; |
| bfd *obfd; |
| { |
| flagword out_flags; |
| 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; |
| out_flags = elf_elfheader (obfd)->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_m68k_print_private_bfd_data (abfd, ptr) |
| bfd *abfd; |
| PTR 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_CPU32) |
| fprintf (file, _(" [cpu32]")); |
| |
| if (elf_elfheader (abfd)->e_flags & EF_M68000) |
| fprintf (file, _(" [m68000]")); |
| |
| 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_m68k_check_relocs (abfd, info, sec, 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; |
| bfd_signed_vma *local_got_refcounts; |
| 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); |
| local_got_refcounts = elf_local_got_refcounts (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]; |
| |
| switch (ELF32_R_TYPE (rel->r_info)) |
| { |
| case R_68K_GOT8: |
| case R_68K_GOT16: |
| case R_68K_GOT32: |
| if (h != NULL |
| && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) |
| break; |
| /* Fall through. */ |
| case R_68K_GOT8O: |
| case R_68K_GOT16O: |
| case R_68K_GOT32O: |
| /* 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_section_by_name (dynobj, ".got"); |
| BFD_ASSERT (sgot != NULL); |
| } |
| |
| if (srelgot == NULL |
| && (h != NULL || info->shared)) |
| { |
| srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); |
| if (srelgot == NULL) |
| { |
| srelgot = bfd_make_section (dynobj, ".rela.got"); |
| if (srelgot == NULL |
| || !bfd_set_section_flags (dynobj, srelgot, |
| (SEC_ALLOC |
| | SEC_LOAD |
| | SEC_HAS_CONTENTS |
| | SEC_IN_MEMORY |
| | SEC_LINKER_CREATED |
| | SEC_READONLY)) |
| || !bfd_set_section_alignment (dynobj, srelgot, 2)) |
| return FALSE; |
| } |
| } |
| |
| if (h != NULL) |
| { |
| if (h->got.refcount == 0) |
| { |
| /* Make sure this symbol is output as a dynamic symbol. */ |
| if (h->dynindx == -1 |
| && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) |
| { |
| if (!bfd_elf32_link_record_dynamic_symbol (info, h)) |
| return FALSE; |
| } |
| |
| /* Allocate space in the .got section. */ |
| sgot->_raw_size += 4; |
| /* Allocate relocation space. */ |
| srelgot->_raw_size += sizeof (Elf32_External_Rela); |
| } |
| h->got.refcount++; |
| } |
| else |
| { |
| /* This is a global offset table entry for a local symbol. */ |
| if (local_got_refcounts == NULL) |
| { |
| bfd_size_type size; |
| |
| size = symtab_hdr->sh_info; |
| size *= sizeof (bfd_signed_vma); |
| local_got_refcounts = ((bfd_signed_vma *) |
| bfd_zalloc (abfd, size)); |
| if (local_got_refcounts == NULL) |
| return FALSE; |
| elf_local_got_refcounts (abfd) = local_got_refcounts; |
| } |
| if (local_got_refcounts[r_symndx] == 0) |
| { |
| sgot->_raw_size += 4; |
| if (info->shared) |
| { |
| /* If we are generating a shared object, we need to |
| output a R_68K_RELATIVE reloc so that the dynamic |
| linker can adjust this GOT entry. */ |
| srelgot->_raw_size += sizeof (Elf32_External_Rela); |
| } |
| } |
| local_got_refcounts[r_symndx]++; |
| } |
| break; |
| |
| case R_68K_PLT8: |
| case R_68K_PLT16: |
| case R_68K_PLT32: |
| /* This symbol requires a procedure linkage table entry. We |
| actually build the entry in adjust_dynamic_symbol, |
| because this might be a case of linking PIC code which is |
| never referenced by a dynamic object, in which case we |
| don't need to generate a procedure linkage table entry |
| after all. */ |
| |
| /* If this is a local symbol, we resolve it directly without |
| creating a procedure linkage table entry. */ |
| if (h == NULL) |
| continue; |
| |
| h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; |
| h->plt.refcount++; |
| break; |
| |
| case R_68K_PLT8O: |
| case R_68K_PLT16O: |
| case R_68K_PLT32O: |
| /* This symbol requires a procedure linkage table entry. */ |
| |
| if (h == NULL) |
| { |
| /* It does not make sense to have this relocation for a |
| local symbol. FIXME: does it? How to handle it if |
| it does make sense? */ |
| bfd_set_error (bfd_error_bad_value); |
| return FALSE; |
| } |
| |
| /* Make sure this symbol is output as a dynamic symbol. */ |
| if (h->dynindx == -1 |
| && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) |
| { |
| if (!bfd_elf32_link_record_dynamic_symbol (info, h)) |
| return FALSE; |
| } |
| |
| h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; |
| h->plt.refcount++; |
| break; |
| |
| case R_68K_PC8: |
| case R_68K_PC16: |
| case R_68K_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->root.type == bfd_link_hash_defweak |
| || (h->elf_link_hash_flags |
| & ELF_LINK_HASH_DEF_REGULAR) == 0))) |
| { |
| if (h != NULL) |
| { |
| /* Make sure a plt entry is created for this symbol if |
| it turns out to be a function defined by a dynamic |
| object. */ |
| h->plt.refcount++; |
| } |
| break; |
| } |
| /* Fall through. */ |
| case R_68K_8: |
| case R_68K_16: |
| case R_68K_32: |
| if (h != NULL) |
| { |
| /* Make sure a plt entry is created for this symbol if it |
| turns out to be a function defined by a dynamic object. */ |
| 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) |
| { |
| const char *name; |
| |
| name = (bfd_elf_string_from_elf_section |
| (abfd, |
| elf_elfheader (abfd)->e_shstrndx, |
| elf_section_data (sec)->rel_hdr.sh_name)); |
| if (name == NULL) |
| return FALSE; |
| |
| BFD_ASSERT (strncmp (name, ".rela", 5) == 0 |
| && strcmp (bfd_get_section_name (abfd, sec), |
| name + 5) == 0); |
| |
| sreloc = bfd_get_section_by_name (dynobj, name); |
| if (sreloc == NULL) |
| { |
| sreloc = bfd_make_section (dynobj, name); |
| if (sreloc == NULL |
| || !bfd_set_section_flags (dynobj, sreloc, |
| (SEC_ALLOC |
| | SEC_LOAD |
| | SEC_HAS_CONTENTS |
| | SEC_IN_MEMORY |
| | SEC_LINKER_CREATED |
| | SEC_READONLY)) |
| || !bfd_set_section_alignment (dynobj, sreloc, 2)) |
| return FALSE; |
| } |
| elf_section_data (sec)->sreloc = sreloc; |
| } |
| |
| if (sec->flags & SEC_READONLY |
| /* Don't set DF_TEXTREL yet for PC relative |
| relocations, they might be discarded later. */ |
| && !(ELF32_R_TYPE (rel->r_info) == R_68K_PC8 |
| || ELF32_R_TYPE (rel->r_info) == R_68K_PC16 |
| || ELF32_R_TYPE (rel->r_info) == R_68K_PC32)) |
| info->flags |= DF_TEXTREL; |
| |
| sreloc->_raw_size += sizeof (Elf32_External_Rela); |
| |
| /* We count the number of PC relative relocations we have |
| entered for this symbol, so that we can discard them |
| again if, in the -Bsymbolic case, the symbol is later |
| defined by a regular object, or, in the normal shared |
| case, the symbol is forced to be local. Note that this |
| function is only called if we are using an m68kelf linker |
| hash table, which means that h is really a pointer to an |
| elf_m68k_link_hash_entry. */ |
| if (ELF32_R_TYPE (rel->r_info) == R_68K_PC8 |
| || ELF32_R_TYPE (rel->r_info) == R_68K_PC16 |
| || ELF32_R_TYPE (rel->r_info) == R_68K_PC32) |
| { |
| struct elf_m68k_pcrel_relocs_copied *p; |
| struct elf_m68k_pcrel_relocs_copied **head; |
| |
| if (h != NULL) |
| { |
| struct elf_m68k_link_hash_entry *eh |
| = elf_m68k_hash_entry (h); |
| head = &eh->pcrel_relocs_copied; |
| } |
| else |
| { |
| asection *s; |
| s = (bfd_section_from_r_symndx |
| (abfd, &elf_m68k_hash_table (info)->sym_sec, |
| sec, r_symndx)); |
| if (s == NULL) |
| return FALSE; |
| |
| head = ((struct elf_m68k_pcrel_relocs_copied **) |
| &elf_section_data (s)->local_dynrel); |
| } |
| |
| for (p = *head; p != NULL; p = p->next) |
| if (p->section == sreloc) |
| break; |
| |
| if (p == NULL) |
| { |
| p = ((struct elf_m68k_pcrel_relocs_copied *) |
| bfd_alloc (dynobj, (bfd_size_type) sizeof *p)); |
| if (p == NULL) |
| return FALSE; |
| p->next = *head; |
| *head = 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_68K_GNU_VTINHERIT: |
| if (!_bfd_elf32_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_68K_GNU_VTENTRY: |
| if (!_bfd_elf32_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_m68k_gc_mark_hook (sec, info, rel, h, sym) |
| asection *sec; |
| struct bfd_link_info *info ATTRIBUTE_UNUSED; |
| 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_68K_GNU_VTINHERIT: |
| case R_68K_GNU_VTENTRY: |
| break; |
| |
| default: |
| switch (h->root.type) |
| { |
| default: |
| break; |
| |
| case bfd_link_hash_defined: |
| case bfd_link_hash_defweak: |
| return h->root.u.def.section; |
| |
| case bfd_link_hash_common: |
| return h->root.u.c.p->section; |
| } |
| } |
| } |
| else |
| return bfd_section_from_elf_index (sec->owner, sym->st_shndx); |
| |
| return NULL; |
| } |
| |
| /* Update the got entry reference counts for the section being removed. */ |
| |
| static bfd_boolean |
| elf_m68k_gc_sweep_hook (abfd, info, sec, relocs) |
| 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; |
| bfd_signed_vma *local_got_refcounts; |
| const Elf_Internal_Rela *rel, *relend; |
| bfd *dynobj; |
| asection *sgot; |
| asection *srelgot; |
| |
| dynobj = elf_hash_table (info)->dynobj; |
| if (dynobj == NULL) |
| return TRUE; |
| |
| symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| sym_hashes = elf_sym_hashes (abfd); |
| local_got_refcounts = elf_local_got_refcounts (abfd); |
| |
| sgot = bfd_get_section_by_name (dynobj, ".got"); |
| srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); |
| |
| relend = relocs + sec->reloc_count; |
| for (rel = relocs; rel < relend; rel++) |
| { |
| unsigned long r_symndx; |
| struct elf_link_hash_entry *h; |
| |
| switch (ELF32_R_TYPE (rel->r_info)) |
| { |
| case R_68K_GOT8: |
| case R_68K_GOT16: |
| case R_68K_GOT32: |
| case R_68K_GOT8O: |
| case R_68K_GOT16O: |
| case R_68K_GOT32O: |
| r_symndx = ELF32_R_SYM (rel->r_info); |
| if (r_symndx >= symtab_hdr->sh_info) |
| { |
| h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| if (h->got.refcount > 0) |
| { |
| --h->got.refcount; |
| if (h->got.refcount == 0) |
| { |
| /* We don't need the .got entry any more. */ |
| sgot->_raw_size -= 4; |
| srelgot->_raw_size -= sizeof (Elf32_External_Rela); |
| } |
| } |
| } |
| else if (local_got_refcounts != NULL) |
| { |
| if (local_got_refcounts[r_symndx] > 0) |
| { |
| --local_got_refcounts[r_symndx]; |
| if (local_got_refcounts[r_symndx] == 0) |
| { |
| /* We don't need the .got entry any more. */ |
| sgot->_raw_size -= 4; |
| if (info->shared) |
| srelgot->_raw_size -= sizeof (Elf32_External_Rela); |
| } |
| } |
| } |
| break; |
| |
| case R_68K_PLT8: |
| case R_68K_PLT16: |
| case R_68K_PLT32: |
| case R_68K_PLT8O: |
| case R_68K_PLT16O: |
| case R_68K_PLT32O: |
| case R_68K_PC8: |
| case R_68K_PC16: |
| case R_68K_PC32: |
| case R_68K_8: |
| case R_68K_16: |
| case R_68K_32: |
| r_symndx = ELF32_R_SYM (rel->r_info); |
| if (r_symndx >= symtab_hdr->sh_info) |
| { |
| h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| if (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_m68k_adjust_dynamic_symbol (info, h) |
| struct bfd_link_info *info; |
| struct elf_link_hash_entry *h; |
| { |
| bfd *dynobj; |
| asection *s; |
| unsigned int power_of_two; |
| |
| dynobj = elf_hash_table (info)->dynobj; |
| |
| /* Make sure we know what is going on here. */ |
| BFD_ASSERT (dynobj != NULL |
| && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) |
| || h->weakdef != NULL |
| || ((h->elf_link_hash_flags |
| & ELF_LINK_HASH_DEF_DYNAMIC) != 0 |
| && (h->elf_link_hash_flags |
| & ELF_LINK_HASH_REF_REGULAR) != 0 |
| && (h->elf_link_hash_flags |
| & ELF_LINK_HASH_DEF_REGULAR) == 0))); |
| |
| /* 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->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) |
| { |
| if (! info->shared |
| && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 |
| && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0 |
| /* We must always create the plt entry if it was referenced |
| by a PLTxxO relocation. In this case we already recorded |
| it as a dynamic symbol. */ |
| && h->dynindx == -1) |
| { |
| /* 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. In such a case, we don't actually need to build |
| a procedure linkage table, and we can just do a PCxx |
| reloc instead. */ |
| BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0); |
| h->plt.offset = (bfd_vma) -1; |
| return TRUE; |
| } |
| |
| /* GC may have rendered this entry unused. */ |
| if (h->plt.refcount <= 0) |
| { |
| h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; |
| h->plt.offset = (bfd_vma) -1; |
| return TRUE; |
| } |
| |
| /* Make sure this symbol is output as a dynamic symbol. */ |
| if (h->dynindx == -1 |
| && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) |
| { |
| if (! bfd_elf32_link_record_dynamic_symbol (info, h)) |
| return FALSE; |
| } |
| |
| s = bfd_get_section_by_name (dynobj, ".plt"); |
| BFD_ASSERT (s != NULL); |
| |
| /* If this is the first .plt entry, make room for the special |
| first entry. */ |
| if (s->_raw_size == 0) |
| { |
| if (CPU32_FLAG (dynobj)) |
| s->_raw_size += PLT_CPU32_ENTRY_SIZE; |
| else |
| s->_raw_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->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| { |
| h->root.u.def.section = s; |
| h->root.u.def.value = s->_raw_size; |
| } |
| |
| h->plt.offset = s->_raw_size; |
| |
| /* Make room for this entry. */ |
| if (CPU32_FLAG (dynobj)) |
| s->_raw_size += PLT_CPU32_ENTRY_SIZE; |
| else |
| s->_raw_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_section_by_name (dynobj, ".got.plt"); |
| BFD_ASSERT (s != NULL); |
| s->_raw_size += 4; |
| |
| /* We also need to make an entry in the .rela.plt section. */ |
| s = bfd_get_section_by_name (dynobj, ".rela.plt"); |
| BFD_ASSERT (s != NULL); |
| s->_raw_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->weakdef != NULL) |
| { |
| BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined |
| || h->weakdef->root.type == bfd_link_hash_defweak); |
| h->root.u.def.section = h->weakdef->root.u.def.section; |
| h->root.u.def.value = h->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_section_by_name (dynobj, ".dynbss"); |
| BFD_ASSERT (s != NULL); |
| |
| /* We must generate a R_68K_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) |
| { |
| asection *srel; |
| |
| srel = bfd_get_section_by_name (dynobj, ".rela.bss"); |
| BFD_ASSERT (srel != NULL); |
| srel->_raw_size += sizeof (Elf32_External_Rela); |
| h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; |
| } |
| |
| /* We need to figure out the alignment required for this symbol. I |
| have no idea how ELF linkers handle this. */ |
| power_of_two = bfd_log2 (h->size); |
| if (power_of_two > 3) |
| power_of_two = 3; |
| |
| /* Apply the required alignment. */ |
| s->_raw_size = BFD_ALIGN (s->_raw_size, |
| (bfd_size_type) (1 << power_of_two)); |
| if (power_of_two > bfd_get_section_alignment (dynobj, s)) |
| { |
| if (!bfd_set_section_alignment (dynobj, s, power_of_two)) |
| return FALSE; |
| } |
| |
| /* Define the symbol as being at this point in the section. */ |
| h->root.u.def.section = s; |
| h->root.u.def.value = s->_raw_size; |
| |
| /* Increment the section size to make room for the symbol. */ |
| s->_raw_size += h->size; |
| |
| return TRUE; |
| } |
| |
| /* This is the condition under which elf_m68k_finish_dynamic_symbol |
| will be called from elflink.h. If elflink.h doesn't call our |
| finish_dynamic_symbol routine, we'll need to do something about |
| initializing any .plt and .got entries in elf_m68k_relocate_section. */ |
| #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \ |
| ((DYN) \ |
| && ((SHARED) \ |
| || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \ |
| && ((H)->dynindx != -1 \ |
| || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)) |
| |
| /* Set the sizes of the dynamic sections. */ |
| |
| static bfd_boolean |
| elf_m68k_size_dynamic_sections (output_bfd, info) |
| bfd *output_bfd ATTRIBUTE_UNUSED; |
| struct bfd_link_info *info; |
| { |
| bfd *dynobj; |
| asection *s; |
| bfd_boolean plt; |
| bfd_boolean 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 (info->executable) |
| { |
| s = bfd_get_section_by_name (dynobj, ".interp"); |
| BFD_ASSERT (s != NULL); |
| s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; |
| s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; |
| } |
| } |
| else |
| { |
| /* We may have created entries in the .rela.got section. |
| However, if we are not creating the dynamic sections, we will |
| not actually use these entries. Reset the size of .rela.got, |
| which will cause it to get stripped from the output file |
| below. */ |
| s = bfd_get_section_by_name (dynobj, ".rela.got"); |
| if (s != NULL) |
| s->_raw_size = 0; |
| } |
| |
| /* If this is a -Bsymbolic shared link, then we need to discard all |
| PC relative relocs against symbols defined in a regular object. |
| For the normal shared case we discard the PC relative relocs |
| against symbols that have become local due to visibility changes. |
| 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) |
| elf_link_hash_traverse (elf_hash_table (info), |
| elf_m68k_discard_copies, |
| (PTR) 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; |
| for (s = dynobj->sections; s != NULL; s = s->next) |
| { |
| const char *name; |
| bfd_boolean strip; |
| |
| 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); |
| |
| strip = FALSE; |
| |
| if (strcmp (name, ".plt") == 0) |
| { |
| if (s->_raw_size == 0) |
| { |
| /* Strip this section if we don't need it; see the |
| comment below. */ |
| strip = TRUE; |
| } |
| else |
| { |
| /* Remember whether there is a PLT. */ |
| plt = TRUE; |
| } |
| } |
| else if (strncmp (name, ".rela", 5) == 0) |
| { |
| if (s->_raw_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. */ |
| strip = TRUE; |
| } |
| else |
| { |
| 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 (strncmp (name, ".got", 4) != 0) |
| { |
| /* It's not one of our sections, so don't allocate space. */ |
| continue; |
| } |
| |
| if (strip) |
| { |
| _bfd_strip_section_from_output (info, s); |
| continue; |
| } |
| |
| /* Allocate memory for the section contents. */ |
| /* FIXME: This should be a call to bfd_alloc not bfd_zalloc. |
| Unused entries should be reclaimed before the section's contents |
| are written out, but at the moment this does not happen. Thus in |
| order to prevent writing out garbage, we initialise the section's |
| contents to zero. */ |
| s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size); |
| if (s->contents == NULL && s->_raw_size != 0) |
| 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_m68k_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_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (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 ((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_link_hash_traverse if we are |
| creating a shared object. In the -Bsymbolic case it discards the |
| space allocated to copy PC relative relocs against symbols which |
| are defined in regular objects. For the normal shared case, it |
| discards space for pc-relative relocs that have become local due to |
| symbol visibility changes. We allocated space for them in the |
| check_relocs routine, but we won't fill them in in the |
| relocate_section routine. |
| |
| We also check whether any of the remaining relocations apply |
| against a readonly section, and set the DF_TEXTREL flag in this |
| case. */ |
| |
| static bfd_boolean |
| elf_m68k_discard_copies (h, inf) |
| struct elf_link_hash_entry *h; |
| PTR inf; |
| { |
| struct bfd_link_info *info = (struct bfd_link_info *) inf; |
| struct elf_m68k_pcrel_relocs_copied *s; |
| |
| if (h->root.type == bfd_link_hash_warning) |
| h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| |
| if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0 |
| || (!info->symbolic |
| && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)) |
| { |
| if ((info->flags & DF_TEXTREL) == 0) |
| { |
| /* Look for relocations against read-only sections. */ |
| for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied; |
| s != NULL; |
| s = s->next) |
| if ((s->section->flags & SEC_READONLY) != 0) |
| { |
| info->flags |= DF_TEXTREL; |
| break; |
| } |
| } |
| |
| return TRUE; |
| } |
| |
| for (s = elf_m68k_hash_entry (h)->pcrel_relocs_copied; |
| s != NULL; |
| s = s->next) |
| s->section->_raw_size -= s->count * sizeof (Elf32_External_Rela); |
| |
| return TRUE; |
| } |
| |
| /* Relocate an M68K ELF section. */ |
| |
| static bfd_boolean |
| elf_m68k_relocate_section (output_bfd, info, input_bfd, input_section, |
| contents, relocs, local_syms, local_sections) |
| 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 *local_got_offsets; |
| asection *sgot; |
| asection *splt; |
| asection *sreloc; |
| Elf_Internal_Rela *rel; |
| Elf_Internal_Rela *relend; |
| |
| if (info->relocatable) |
| return TRUE; |
| |
| dynobj = elf_hash_table (info)->dynobj; |
| symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| sym_hashes = elf_sym_hashes (input_bfd); |
| local_got_offsets = elf_local_got_offsets (input_bfd); |
| |
| sgot = NULL; |
| splt = 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_boolean unresolved_reloc; |
| bfd_reloc_status_type r; |
| |
| r_type = ELF32_R_TYPE (rel->r_info); |
| if (r_type < 0 || r_type >= (int) R_68K_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; |
| unresolved_reloc = FALSE; |
| |
| 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 warned; |
| |
| RELOC_FOR_GLOBAL_SYMBOL (h, sym_hashes, r_symndx, symtab_hdr, relocation, sec, unresolved_reloc, info, warned); |
| } |
| |
| switch (r_type) |
| { |
| case R_68K_GOT8: |
| case R_68K_GOT16: |
| case R_68K_GOT32: |
| /* Relocation is to the address of the entry for this symbol |
| in the global offset table. */ |
| if (h != NULL |
| && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) |
| break; |
| /* Fall through. */ |
| case R_68K_GOT8O: |
| case R_68K_GOT16O: |
| case R_68K_GOT32O: |
| /* Relocation is the offset of the entry for this symbol in |
| the global offset table. */ |
| |
| { |
| bfd_vma off; |
| |
| if (sgot == NULL) |
| { |
| sgot = bfd_get_section_by_name (dynobj, ".got"); |
| BFD_ASSERT (sgot != NULL); |
| } |
| |
| if (h != NULL) |
| { |
| bfd_boolean dyn; |
| |
| off = h->got.offset; |
| BFD_ASSERT (off != (bfd_vma) -1); |
| |
| dyn = elf_hash_table (info)->dynamic_sections_created; |
| if (!WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) |
| || (info->shared |
| && (info->symbolic |
| || h->dynindx == -1 |
| || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0) |
| && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) != 0) |
| { |
| /* This is actually a static link, or it is a |
| -Bsymbolic link and the symbol is defined |
| locally, or the symbol was forced to be local |
| because of a version file.. We must initialize |
| this entry in the global offset table. Since |
| the offset must always be a multiple of 4, we |
| use the least significant bit to record whether |
| we have initialized it already. |
| |
| When doing a dynamic link, we create a .rela.got |
| relocation entry to initialize the value. This |
| is done in the finish_dynamic_symbol routine. */ |
| if ((off & 1) != 0) |
| off &= ~1; |
| else |
| { |
| bfd_put_32 (output_bfd, relocation, |
| sgot->contents + off); |
| h->got.offset |= 1; |
| } |
| } |
| else |
| unresolved_reloc = FALSE; |
| } |
| else |
| { |
| BFD_ASSERT (local_got_offsets != NULL |
| && local_got_offsets[r_symndx] != (bfd_vma) -1); |
| |
| off = local_got_offsets[r_symndx]; |
| |
| /* The offset must always be a multiple of 4. We use |
| the least significant bit to record whether we have |
| already generated the necessary reloc. */ |
| if ((off & 1) != 0) |
| off &= ~1; |
| else |
| { |
| bfd_put_32 (output_bfd, relocation, sgot->contents + off); |
| |
| if (info->shared) |
| { |
| asection *s; |
| Elf_Internal_Rela outrel; |
| bfd_byte *loc; |
| |
| s = bfd_get_section_by_name (dynobj, ".rela.got"); |
| BFD_ASSERT (s != NULL); |
| |
| outrel.r_offset = (sgot->output_section->vma |
| + sgot->output_offset |
| + off); |
| outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE); |
| outrel.r_addend = relocation; |
| loc = s->contents; |
| loc += s->reloc_count++ * sizeof (Elf32_External_Rela); |
| bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); |
| } |
| |
| local_got_offsets[r_symndx] |= 1; |
| } |
| } |
| |
| relocation = sgot->output_offset + off; |
| if (r_type == R_68K_GOT8O |
| || r_type == R_68K_GOT16O |
| || r_type == R_68K_GOT32O) |
| { |
| /* This relocation does not use the addend. */ |
| rel->r_addend = 0; |
| } |
| else |
| relocation += sgot->output_section->vma; |
| } |
| break; |
| |
| case R_68K_PLT8: |
| case R_68K_PLT16: |
| case R_68K_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) |
| break; |
| |
| if (h->plt.offset == (bfd_vma) -1 |
| || !elf_hash_table (info)->dynamic_sections_created) |
| { |
| /* We didn't make a PLT entry for this symbol. This |
| happens when statically linking PIC code, or when |
| using -Bsymbolic. */ |
| break; |
| } |
| |
| if (splt == NULL) |
| { |
| splt = bfd_get_section_by_name (dynobj, ".plt"); |
| BFD_ASSERT (splt != NULL); |
| } |
| |
| relocation = (splt->output_section->vma |
| + splt->output_offset |
| + h->plt.offset); |
| unresolved_reloc = FALSE; |
| break; |
| |
| case R_68K_PLT8O: |
| case R_68K_PLT16O: |
| case R_68K_PLT32O: |
| /* Relocation is the offset of the entry for this symbol in |
| the procedure linkage table. */ |
| BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1); |
| |
| if (splt == NULL) |
| { |
| splt = bfd_get_section_by_name (dynobj, ".plt"); |
| BFD_ASSERT (splt != NULL); |
| } |
| |
| relocation = h->plt.offset; |
| unresolved_reloc = FALSE; |
| |
| /* This relocation does not use the addend. */ |
| rel->r_addend = 0; |
| |
| break; |
| |
| case R_68K_PC8: |
| case R_68K_PC16: |
| case R_68K_PC32: |
| if (h == NULL |
| || (info->shared |
| && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)) |
| break; |
| /* Fall through. */ |
| case R_68K_8: |
| case R_68K_16: |
| case R_68K_32: |
| if (info->shared |
| && r_symndx != 0 |
| && (input_section->flags & SEC_ALLOC) != 0 |
| && (h == NULL |
| || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
| || h->root.type != bfd_link_hash_undefweak) |
| && ((r_type != R_68K_PC8 |
| && r_type != R_68K_PC16 |
| && r_type != R_68K_PC32) |
| || (h != NULL |
| && h->dynindx != -1 |
| && (!info->symbolic |
| || (h->elf_link_hash_flags |
| & ELF_LINK_HASH_DEF_REGULAR) == 0)))) |
| { |
| 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. */ |
| |
| skip = FALSE; |
| relocate = FALSE; |
| |
| outrel.r_offset = |
| _bfd_elf_section_offset (output_bfd, info, input_section, |
| rel->r_offset); |
| if (outrel.r_offset == (bfd_vma) -1) |
| skip = TRUE; |
| else if (outrel.r_offset == (bfd_vma) -2) |
| skip = TRUE, relocate = TRUE; |
| outrel.r_offset += (input_section->output_section->vma |
| + input_section->output_offset); |
| |
| if (skip) |
| memset (&outrel, 0, sizeof outrel); |
| else if (h != NULL |
| && h->dynindx != -1 |
| && (r_type == R_68K_PC8 |
| || r_type == R_68K_PC16 |
| || r_type == R_68K_PC32 |
| || !info->shared |
| || !info->symbolic |
| || (h->elf_link_hash_flags |
| & ELF_LINK_HASH_DEF_REGULAR) == 0)) |
| { |
| outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); |
| outrel.r_addend = rel->r_addend; |
| } |
| else |
| { |
| /* This symbol is local, or marked to become local. */ |
| if (r_type == R_68K_32) |
| { |
| relocate = TRUE; |
| outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE); |
| 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; |
| |
| osec = sec->output_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; |
| } |
| } |
| |
| sreloc = elf_section_data (input_section)->sreloc; |
| if (sreloc == NULL) |
| abort (); |
| |
| 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_68K_32 |
| relocations that have been turned into |
| R_68K_RELATIVE. */ |
| if (!relocate) |
| continue; |
| } |
| |
| break; |
| |
| case R_68K_GNU_VTINHERIT: |
| case R_68K_GNU_VTENTRY: |
| /* These are no-ops in the end. */ |
| continue; |
| |
| default: |
| break; |
| } |
| |
| /* Dynamic relocs are not propagated for SEC_DEBUGGING sections |
| because such sections are not SEC_ALLOC and thus ld.so will |
| not process them. */ |
| if (unresolved_reloc |
| && !((input_section->flags & SEC_DEBUGGING) != 0 |
| && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0)) |
| { |
| (*_bfd_error_handler) |
| (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"), |
| bfd_archive_filename (input_bfd), |
| bfd_get_section_name (input_bfd, input_section), |
| (long) rel->r_offset, |
| h->root.root.string); |
| return FALSE; |
| } |
| |
| r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| contents, rel->r_offset, |
| relocation, rel->r_addend); |
| |
| if (r != bfd_reloc_ok) |
| { |
| const char *name; |
| |
| if (h != NULL) |
| name = h->root.root.string; |
| else |
| { |
| name = bfd_elf_string_from_elf_section (input_bfd, |
| symtab_hdr->sh_link, |
| sym->st_name); |
| if (name == NULL) |
| return FALSE; |
| if (*name == '\0') |
| name = bfd_section_name (input_bfd, sec); |
| } |
| |
| if (r == bfd_reloc_overflow) |
| { |
| if (!(info->callbacks->reloc_overflow |
| (info, name, howto->name, (bfd_vma) 0, |
| input_bfd, input_section, rel->r_offset))) |
| return FALSE; |
| } |
| else |
| { |
| (*_bfd_error_handler) |
| (_("%s(%s+0x%lx): reloc against `%s': error %d"), |
| bfd_archive_filename (input_bfd), |
| bfd_get_section_name (input_bfd, input_section), |
| (long) rel->r_offset, name, (int) r); |
| return FALSE; |
| } |
| } |
| } |
| |
| return TRUE; |
| } |
| |
| /* Finish up dynamic symbol handling. We set the contents of various |
| dynamic sections here. */ |
| |
| static bfd_boolean |
| elf_m68k_finish_dynamic_symbol (output_bfd, info, h, sym) |
| bfd *output_bfd; |
| struct bfd_link_info *info; |
| struct elf_link_hash_entry *h; |
| Elf_Internal_Sym *sym; |
| { |
| bfd *dynobj; |
| int plt_off1, plt_off2, plt_off3; |
| |
| 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; |
| 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_section_by_name (dynobj, ".plt"); |
| sgot = bfd_get_section_by_name (dynobj, ".got.plt"); |
| srela = bfd_get_section_by_name (dynobj, ".rela.plt"); |
| BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL); |
| |
| /* 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. */ |
| if ( CPU32_FLAG (output_bfd)) |
| plt_index = h->plt.offset / PLT_CPU32_ENTRY_SIZE - 1; |
| else |
| 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 three are reserved. */ |
| got_offset = (plt_index + 3) * 4; |
| |
| if ( CPU32_FLAG (output_bfd)) |
| { |
| /* Fill in the entry in the procedure linkage table. */ |
| memcpy (splt->contents + h->plt.offset, elf_cpu32_plt_entry, |
| PLT_CPU32_ENTRY_SIZE); |
| plt_off1 = 4; |
| plt_off2 = 12; |
| plt_off3 = 18; |
| } |
| else |
| { |
| /* Fill in the entry in the procedure linkage table. */ |
| memcpy (splt->contents + h->plt.offset, elf_m68k_plt_entry, |
| PLT_ENTRY_SIZE); |
| plt_off1 = 4; |
| plt_off2 = 10; |
| plt_off3 = 16; |
| } |
| |
| /* The offset is relative to the first extension word. */ |
| bfd_put_32 (output_bfd, |
| (sgot->output_section->vma |
| + sgot->output_offset |
| + got_offset |
| - (splt->output_section->vma |
| + h->plt.offset + 2)), |
| splt->contents + h->plt.offset + plt_off1); |
| |
| bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela), |
| splt->contents + h->plt.offset + plt_off2); |
| bfd_put_32 (output_bfd, - (h->plt.offset + plt_off3), |
| splt->contents + h->plt.offset + plt_off3); |
| |
| /* Fill in the entry in the global offset table. */ |
| bfd_put_32 (output_bfd, |
| (splt->output_section->vma |
| + splt->output_offset |
| + h->plt.offset |
| + 8), |
| 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_68K_JMP_SLOT); |
| rela.r_addend = 0; |
| loc = srela->contents + plt_index * sizeof (Elf32_External_Rela); |
| bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); |
| |
| if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| { |
| /* 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_section_by_name (dynobj, ".got"); |
| srela = bfd_get_section_by_name (dynobj, ".rela.got"); |
| BFD_ASSERT (sgot != NULL && srela != NULL); |
| |
| rela.r_offset = (sgot->output_section->vma |
| + sgot->output_offset |
| + (h->got.offset &~ (bfd_vma) 1)); |
| |
| /* If this is a -Bsymbolic link, and the symbol is defined |
| locally, we just want to emit a RELATIVE reloc. Likewise if |
| the symbol was forced to be local because of a version file. |
| The entry in the global offset table will already have been |
| initialized in the relocate_section function. */ |
| if (info->shared |
| && (info->symbolic |
| || h->dynindx == -1 |
| || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0) |
| && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) |
| { |
| rela.r_info = ELF32_R_INFO (0, R_68K_RELATIVE); |
| rela.r_addend = bfd_get_signed_32 (output_bfd, |
| (sgot->contents |
| + (h->got.offset &~ (bfd_vma) 1))); |
| } |
| else |
| { |
| bfd_put_32 (output_bfd, (bfd_vma) 0, |
| sgot->contents + (h->got.offset &~ (bfd_vma) 1)); |
| rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT); |
| rela.r_addend = 0; |
| } |
| |
| loc = srela->contents; |
| loc += srela->reloc_count++ * sizeof (Elf32_External_Rela); |
| bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); |
| } |
| |
| if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) |
| { |
| 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_section_by_name (h->root.u.def.section->owner, |
| ".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_68K_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 (strcmp (h->root.root.string, "_DYNAMIC") == 0 |
| || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) |
| sym->st_shndx = SHN_ABS; |
| |
| return TRUE; |
| } |
| |
| /* Finish up the dynamic sections. */ |
| |
| static bfd_boolean |
| elf_m68k_finish_dynamic_sections (output_bfd, info) |
| bfd *output_bfd; |
| struct bfd_link_info *info; |
| { |
| bfd *dynobj; |
| asection *sgot; |
| asection *sdyn; |
| |
| dynobj = elf_hash_table (info)->dynobj; |
| |
| sgot = bfd_get_section_by_name (dynobj, ".got.plt"); |
| BFD_ASSERT (sgot != NULL); |
| sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); |
| |
| if (elf_hash_table (info)->dynamic_sections_created) |
| { |
| asection *splt; |
| Elf32_External_Dyn *dyncon, *dynconend; |
| |
| splt = bfd_get_section_by_name (dynobj, ".plt"); |
| BFD_ASSERT (splt != NULL && sdyn != NULL); |
| |
| dyncon = (Elf32_External_Dyn *) sdyn->contents; |
| dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_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); |
| if (s->_cooked_size != 0) |
| dyn.d_un.d_val = s->_cooked_size; |
| else |
| dyn.d_un.d_val = s->_raw_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) |
| { |
| if (s->_cooked_size != 0) |
| dyn.d_un.d_val -= s->_cooked_size; |
| else |
| dyn.d_un.d_val -= s->_raw_size; |
| } |
| bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
| break; |
| } |
| } |
| |
| /* Fill in the first entry in the procedure linkage table. */ |
| if (splt->_raw_size > 0) |
| { |
| if (!CPU32_FLAG (output_bfd)) |
| { |
| memcpy (splt->contents, elf_m68k_plt0_entry, PLT_ENTRY_SIZE); |
| bfd_put_32 (output_bfd, |
| (sgot->output_section->vma |
| + sgot->output_offset + 4 |
| - (splt->output_section->vma + 2)), |
| splt->contents + 4); |
| bfd_put_32 (output_bfd, |
| (sgot->output_section->vma |
| + sgot->output_offset + 8 |
| - (splt->output_section->vma + 10)), |
| splt->contents + 12); |
| elf_section_data (splt->output_section)->this_hdr.sh_entsize |
| = PLT_ENTRY_SIZE; |
| } |
| else /* cpu32 */ |
| { |
| memcpy (splt->contents, elf_cpu32_plt0_entry, PLT_CPU32_ENTRY_SIZE); |
| bfd_put_32 (output_bfd, |
| (sgot->output_section->vma |
| + sgot->output_offset + 4 |
| - (splt->output_section->vma + 2)), |
| splt->contents + 4); |
| bfd_put_32 (output_bfd, |
| (sgot->output_section->vma |
| + sgot->output_offset + 8 |
| - (splt->output_section->vma + 10)), |
| splt->contents + 12); |
| elf_section_data (splt->output_section)->this_hdr.sh_entsize |
| = PLT_CPU32_ENTRY_SIZE; |
| } |
| } |
| } |
| |
| /* Fill in the first three entries in the global offset table. */ |
| if (sgot->_raw_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); |
| } |
| |
| elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; |
| |
| return TRUE; |
| } |
| |
| /* Given a .data section and a .emreloc in-memory section, store |
| relocation information into the .emreloc section which can be |
| used at runtime to relocate the section. This is called by the |
| linker when the --embedded-relocs switch is used. This is called |
| after the add_symbols entry point has been called for all the |
| objects, and before the final_link entry point is called. */ |
| |
| bfd_boolean |
| bfd_m68k_elf32_create_embedded_relocs (abfd, info, datasec, relsec, errmsg) |
| bfd *abfd; |
| struct bfd_link_info *info; |
| asection *datasec; |
| asection *relsec; |
| char **errmsg; |
| { |
| Elf_Internal_Shdr *symtab_hdr; |
| Elf_Internal_Sym *isymbuf = NULL; |
| Elf_Internal_Rela *internal_relocs = NULL; |
| Elf_Internal_Rela *irel, *irelend; |
| bfd_byte *p; |
| bfd_size_type amt; |
| |
| BFD_ASSERT (! info->relocatable); |
| |
| *errmsg = NULL; |
| |
| if (datasec->reloc_count == 0) |
| return TRUE; |
| |
| symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| |
| /* Get a copy of the native relocations. */ |
| internal_relocs = (_bfd_elf_link_read_relocs |
| (abfd, datasec, (PTR) NULL, (Elf_Internal_Rela *) NULL, |
| info->keep_memory)); |
| if (internal_relocs == NULL) |
| goto error_return; |
| |
| amt = (bfd_size_type) datasec->reloc_count * 12; |
| relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt); |
| if (relsec->contents == NULL) |
| goto error_return; |
| |
| p = relsec->contents; |
| |
| irelend = internal_relocs + datasec->reloc_count; |
| for (irel = internal_relocs; irel < irelend; irel++, p += 12) |
| { |
| asection *targetsec; |
| |
| /* We are going to write a four byte longword into the runtime |
| reloc section. The longword will be the address in the data |
| section which must be relocated. It is followed by the name |
| of the target section NUL-padded or truncated to 8 |
| characters. */ |
| |
| /* We can only relocate absolute longword relocs at run time. */ |
| if (ELF32_R_TYPE (irel->r_info) != (int) R_68K_32) |
| { |
| *errmsg = _("unsupported reloc type"); |
| bfd_set_error (bfd_error_bad_value); |
| goto error_return; |
| } |
| |
| /* Get the target section referred to by the reloc. */ |
| if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) |
| { |
| /* A local symbol. */ |
| Elf_Internal_Sym *isym; |
| |
| /* Read this BFD's local symbols if we haven't done so already. */ |
| if (isymbuf == NULL) |
| { |
| isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; |
| if (isymbuf == NULL) |
| isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, |
| symtab_hdr->sh_info, 0, |
| NULL, NULL, NULL); |
| if (isymbuf == NULL) |
| goto error_return; |
| } |
| |
| isym = isymbuf + ELF32_R_SYM (irel->r_info); |
| targetsec = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| } |
| else |
| { |
| unsigned long indx; |
| struct elf_link_hash_entry *h; |
| |
| /* An external symbol. */ |
| indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; |
| h = elf_sym_hashes (abfd)[indx]; |
| BFD_ASSERT (h != NULL); |
| if (h->root.type == bfd_link_hash_defined |
| || h->root.type == bfd_link_hash_defweak) |
| targetsec = h->root.u.def.section; |
| else |
| targetsec = NULL; |
| } |
| |
| bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p); |
| memset (p + 4, 0, 8); |
| if (targetsec != NULL) |
| strncpy (p + 4, targetsec->output_section->name, 8); |
| } |
| |
| if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) |
| free (isymbuf); |
| if (internal_relocs != NULL |
| && elf_section_data (datasec)->relocs != internal_relocs) |
| free (internal_relocs); |
| return TRUE; |
| |
| error_return: |
| if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) |
| free (isymbuf); |
| if (internal_relocs != NULL |
| && elf_section_data (datasec)->relocs != internal_relocs) |
| free (internal_relocs); |
| return FALSE; |
| } |
| |
| static enum elf_reloc_type_class |
| elf32_m68k_reloc_type_class (rela) |
| const Elf_Internal_Rela *rela; |
| { |
| switch ((int) ELF32_R_TYPE (rela->r_info)) |
| { |
| case R_68K_RELATIVE: |
| return reloc_class_relative; |
| case R_68K_JMP_SLOT: |
| return reloc_class_plt; |
| case R_68K_COPY: |
| return reloc_class_copy; |
| default: |
| return reloc_class_normal; |
| } |
| } |
| |
| #define TARGET_BIG_SYM bfd_elf32_m68k_vec |
| #define TARGET_BIG_NAME "elf32-m68k" |
| #define ELF_MACHINE_CODE EM_68K |
| #define ELF_MAXPAGESIZE 0x2000 |
| #define elf_backend_create_dynamic_sections \ |
| _bfd_elf_create_dynamic_sections |
| #define bfd_elf32_bfd_link_hash_table_create \ |
| elf_m68k_link_hash_table_create |
| #define bfd_elf32_bfd_final_link _bfd_elf32_gc_common_final_link |
| |
| #define elf_backend_check_relocs elf_m68k_check_relocs |
| #define elf_backend_adjust_dynamic_symbol \ |
| elf_m68k_adjust_dynamic_symbol |
| #define elf_backend_size_dynamic_sections \ |
| elf_m68k_size_dynamic_sections |
| #define elf_backend_relocate_section elf_m68k_relocate_section |
| #define elf_backend_finish_dynamic_symbol \ |
| elf_m68k_finish_dynamic_symbol |
| #define elf_backend_finish_dynamic_sections \ |
| elf_m68k_finish_dynamic_sections |
| #define elf_backend_gc_mark_hook elf_m68k_gc_mark_hook |
| #define elf_backend_gc_sweep_hook elf_m68k_gc_sweep_hook |
| #define bfd_elf32_bfd_merge_private_bfd_data \ |
| elf32_m68k_merge_private_bfd_data |
| #define bfd_elf32_bfd_set_private_flags \ |
| elf32_m68k_set_private_flags |
| #define bfd_elf32_bfd_print_private_bfd_data \ |
| elf32_m68k_print_private_bfd_data |
| #define elf_backend_reloc_type_class elf32_m68k_reloc_type_class |
| |
| #define elf_backend_can_gc_sections 1 |
| #define elf_backend_can_refcount 1 |
| #define elf_backend_want_got_plt 1 |
| #define elf_backend_plt_readonly 1 |
| #define elf_backend_want_plt_sym 0 |
| #define elf_backend_got_header_size 12 |
| #define elf_backend_rela_normal 1 |
| |
| #include "elf32-target.h" |