diff options
Diffstat (limited to 'bfd/elf32-arm.c')
| -rw-r--r-- | bfd/elf32-arm.c | 64 |
1 files changed, 43 insertions, 21 deletions
diff --git a/bfd/elf32-arm.c b/bfd/elf32-arm.c index b72e397..a42db44 100644 --- a/bfd/elf32-arm.c +++ b/bfd/elf32-arm.c @@ -2290,6 +2290,22 @@ static const bfd_vma elf32_arm_fdpic_plt_entry [] = 0xe599f000, /* ldr pc, [r9] */ }; +/* Thumb FDPIC PLT entry. */ +/* The last 5 words contain PLT lazy fragment code and data. */ +static const bfd_vma elf32_arm_fdpic_thumb_plt_entry [] = + { + 0xc00cf8df, /* ldr.w r12, .L1 */ + 0x0c09eb0c, /* add.w r12, r12, r9 */ + 0x9004f8dc, /* ldr.w r9, [r12, #4] */ + 0xf000f8dc, /* ldr.w pc, [r12] */ + 0x00000000, /* .L1 .word foo(GOTOFFFUNCDESC) */ + 0x00000000, /* .L2 .word foo(funcdesc_value_reloc_offset) */ + 0xc008f85f, /* ldr.w r12, .L2 */ + 0xcd04f84d, /* push {r12} */ + 0xc004f8d9, /* ldr.w r12, [r9, #4] */ + 0xf000f8d9, /* ldr.w pc, [r9] */ + }; + #ifdef FOUR_WORD_PLT /* The first entry in a procedure linkage table looks like @@ -3620,6 +3636,8 @@ elf32_arm_get_plt_info (bfd *abfd, struct elf32_arm_link_hash_table *globals, return TRUE; } +static bfd_boolean using_thumb_only (struct elf32_arm_link_hash_table *globals); + /* Return true if the PLT described by ARM_PLT requires a Thumb stub before it. */ @@ -3630,8 +3648,9 @@ elf32_arm_plt_needs_thumb_stub_p (struct bfd_link_info *info, struct elf32_arm_link_hash_table *htab; htab = elf32_arm_hash_table (info); - return (arm_plt->thumb_refcount != 0 - || (!htab->use_blx && arm_plt->maybe_thumb_refcount != 0)); + + return (!using_thumb_only(htab) && (arm_plt->thumb_refcount != 0 + || (!htab->use_blx && arm_plt->maybe_thumb_refcount != 0))); } /* Return a pointer to the head of the dynamic reloc list that should @@ -9729,6 +9748,10 @@ elf32_arm_populate_plt_entry (bfd *output_bfd, struct bfd_link_info *info, } else if (htab->fdpic_p) { + const bfd_vma *plt_entry = using_thumb_only(htab) + ? elf32_arm_fdpic_thumb_plt_entry + : elf32_arm_fdpic_plt_entry; + /* Fill-up Thumb stub if needed. */ if (elf32_arm_plt_needs_thumb_stub_p (info, arm_plt)) { @@ -9737,14 +9760,13 @@ elf32_arm_populate_plt_entry (bfd *output_bfd, struct bfd_link_info *info, put_thumb_insn (htab, output_bfd, elf32_arm_plt_thumb_stub[1], ptr - 2); } - put_arm_insn(htab, output_bfd, - elf32_arm_fdpic_plt_entry[0], ptr + 0); - put_arm_insn(htab, output_bfd, - elf32_arm_fdpic_plt_entry[1], ptr + 4); - put_arm_insn(htab, output_bfd, - elf32_arm_fdpic_plt_entry[2], ptr + 8); - put_arm_insn(htab, output_bfd, - elf32_arm_fdpic_plt_entry[3], ptr + 12); + /* As we are using 32 bit instructions even for the Thumb + version, we have to use 'put_arm_insn' instead of + 'put_thumb_insn'. */ + put_arm_insn(htab, output_bfd, plt_entry[0], ptr + 0); + put_arm_insn(htab, output_bfd, plt_entry[1], ptr + 4); + put_arm_insn(htab, output_bfd, plt_entry[2], ptr + 8); + put_arm_insn(htab, output_bfd, plt_entry[3], ptr + 12); bfd_put_32 (output_bfd, got_offset, ptr + 16); if (!(info->flags & DF_BIND_NOW)) @@ -9753,14 +9775,10 @@ elf32_arm_populate_plt_entry (bfd *output_bfd, struct bfd_link_info *info, bfd_put_32 (output_bfd, htab->root.srelplt->reloc_count * RELOC_SIZE (htab), ptr + 20); - put_arm_insn(htab, output_bfd, - elf32_arm_fdpic_plt_entry[6], ptr + 24); - put_arm_insn(htab, output_bfd, - elf32_arm_fdpic_plt_entry[7], ptr + 28); - put_arm_insn(htab, output_bfd, - elf32_arm_fdpic_plt_entry[8], ptr + 32); - put_arm_insn(htab, output_bfd, - elf32_arm_fdpic_plt_entry[9], ptr + 36); + put_arm_insn(htab, output_bfd, plt_entry[6], ptr + 24); + put_arm_insn(htab, output_bfd, plt_entry[7], ptr + 28); + put_arm_insn(htab, output_bfd, plt_entry[8], ptr + 32); + put_arm_insn(htab, output_bfd, plt_entry[9], ptr + 36); } } else if (using_thumb_only (htab)) @@ -17767,15 +17785,19 @@ elf32_arm_output_plt_map_1 (output_arch_syminfo *osi, } else if (htab->fdpic_p) { + enum map_symbol_type type = using_thumb_only(htab) + ? ARM_MAP_THUMB + : ARM_MAP_ARM; + if (elf32_arm_plt_needs_thumb_stub_p (osi->info, arm_plt)) if (!elf32_arm_output_map_sym (osi, ARM_MAP_THUMB, addr - 4)) return FALSE; - if (!elf32_arm_output_map_sym (osi, ARM_MAP_ARM, addr)) + if (!elf32_arm_output_map_sym (osi, type, addr)) return FALSE; if (!elf32_arm_output_map_sym (osi, ARM_MAP_DATA, addr + 16)) return FALSE; if (htab->plt_entry_size == 4 * ARRAY_SIZE(elf32_arm_fdpic_plt_entry)) - if (!elf32_arm_output_map_sym (osi, ARM_MAP_ARM, addr + 24)) + if (!elf32_arm_output_map_sym (osi, type, addr + 24)) return FALSE; } else if (using_thumb_only (htab)) @@ -18134,7 +18156,7 @@ elf32_arm_output_arch_local_syms (bfd *output_bfd, if (!elf32_arm_output_map_sym (&osi, ARM_MAP_ARM, 0)) return FALSE; } - else if (using_thumb_only (htab)) + else if (using_thumb_only (htab) && !htab->fdpic_p) { if (!elf32_arm_output_map_sym (&osi, ARM_MAP_THUMB, 0)) return FALSE; |