diff --git a/bfd/bfd-in.h b/bfd/bfd-in.h index c7c5a7d..52fa19e 100644 --- a/bfd/bfd-in.h +++ b/bfd/bfd-in.h @@ -887,6 +887,8 @@ extern bfd_boolean bfd_is_arm_special_symbol_name extern void bfd_elf32_arm_set_byteswap_code (struct bfd_link_info *, int); +extern void bfd_elf32_arm_use_long_plt (void); + /* ARM Note section processing. */ extern bfd_boolean bfd_arm_merge_machines (bfd *, bfd *); diff --git a/bfd/bfd-in2.h b/bfd/bfd-in2.h index 33792f4..92cd688 100644 --- a/bfd/bfd-in2.h +++ b/bfd/bfd-in2.h @@ -894,6 +894,8 @@ extern bfd_boolean bfd_is_arm_special_symbol_name extern void bfd_elf32_arm_set_byteswap_code (struct bfd_link_info *, int); +extern void bfd_elf32_arm_use_long_plt (void); + /* ARM Note section processing. */ extern bfd_boolean bfd_arm_merge_machines (bfd *, bfd *); diff --git a/bfd/elf32-arm.c b/bfd/elf32-arm.c index 7216244..bbf394e 100644 --- a/bfd/elf32-arm.c +++ b/bfd/elf32-arm.c @@ -2142,13 +2142,24 @@ static const bfd_vma elf32_arm_plt0_entry [] = /* Subsequent entries in a procedure linkage table look like this. */ -static const bfd_vma elf32_arm_plt_entry [] = +static const bfd_vma elf32_arm_plt_entry_short [] = { 0xe28fc600, /* add ip, pc, #0xNN00000 */ 0xe28cca00, /* add ip, ip, #0xNN000 */ 0xe5bcf000, /* ldr pc, [ip, #0xNNN]! */ }; +/* Or this */ +static const bfd_vma elf32_arm_plt_entry_long [] = + { + 0xe28fc200, /* add ip, pc, #0xN0000000 */ + 0xe28cc600, /* add ip, ip, #0xNN00000 */ + 0xe28cca00, /* add ip, ip, #0xNN000 */ + 0xe5bcf000, /* ldr pc, [ip, #0xNNN]! */ + }; + +static size_t elf32_arm_use_long_plt_entry = 0; + #endif /* The format of the first entry in the procedure linkage table @@ -3464,7 +3475,7 @@ elf32_arm_link_hash_table_create (bfd *abfd) ret->plt_entry_size = 16; #else ret->plt_header_size = 20; - ret->plt_entry_size = 12; + ret->plt_entry_size = elf32_arm_use_long_plt_entry ? 16 : 12; #endif ret->use_rel = 1; ret->obfd = abfd; @@ -6027,6 +6038,15 @@ arm_make_glue_section (bfd * abfd, const char * name) return TRUE; } +/* Set size of .plt entries. This function is called from the + linker scripts in ld/emultempl/{armelf}.em. */ + +void +bfd_elf32_arm_use_long_plt (void) +{ + elf32_arm_use_long_plt_entry = 1; +} + /* Add the glue sections to ABFD. This function is called from the linker scripts in ld/emultempl/{armelf}.em. */ @@ -7705,8 +7725,6 @@ elf32_arm_populate_plt_entry (bfd *output_bfd, struct bfd_link_info *info, of the PLT stub. */ got_displacement = got_address - (plt_address + 8); - BFD_ASSERT ((got_displacement & 0xf0000000) == 0); - if (elf32_arm_plt_needs_thumb_stub_p (info, arm_plt)) { put_thumb_insn (htab, output_bfd, @@ -7715,21 +7733,44 @@ elf32_arm_populate_plt_entry (bfd *output_bfd, struct bfd_link_info *info, elf32_arm_plt_thumb_stub[1], ptr - 2); } - put_arm_insn (htab, output_bfd, - elf32_arm_plt_entry[0] - | ((got_displacement & 0x0ff00000) >> 20), - ptr + 0); - put_arm_insn (htab, output_bfd, - elf32_arm_plt_entry[1] - | ((got_displacement & 0x000ff000) >> 12), - ptr+ 4); - put_arm_insn (htab, output_bfd, - elf32_arm_plt_entry[2] - | (got_displacement & 0x00000fff), - ptr + 8); + if (!elf32_arm_use_long_plt_entry) + { + BFD_ASSERT ((got_displacement & 0xf0000000) == 0); + put_arm_insn (htab, output_bfd, + elf32_arm_plt_entry_short[0] + | ((got_displacement & 0x0ff00000) >> 20), + ptr + 0); + put_arm_insn (htab, output_bfd, + elf32_arm_plt_entry_short[1] + | ((got_displacement & 0x000ff000) >> 12), + ptr+ 4); + put_arm_insn (htab, output_bfd, + elf32_arm_plt_entry_short[2] + | (got_displacement & 0x00000fff), + ptr + 8); #ifdef FOUR_WORD_PLT - bfd_put_32 (output_bfd, elf32_arm_plt_entry[3], ptr + 12); + bfd_put_32 (output_bfd, elf32_arm_plt_entry_short[3], ptr + 12); #endif + } + else + { + put_arm_insn (htab, output_bfd, + elf32_arm_plt_entry_long[0] + | ((got_displacement & 0xf0000000) >> 28), + ptr + 0); + put_arm_insn (htab, output_bfd, + elf32_arm_plt_entry_long[1] + | ((got_displacement & 0x0ff00000) >> 20), + ptr + 4); + put_arm_insn (htab, output_bfd, + elf32_arm_plt_entry_long[2] + | ((got_displacement & 0x000ff000) >> 12), + ptr+ 8); + put_arm_insn (htab, output_bfd, + elf32_arm_plt_entry_long[3] + | (got_displacement & 0x00000fff), + ptr + 12); + } } /* Fill in the entry in the .rel(a).(i)plt section. */ diff --git a/elfcpp/arm.h b/elfcpp/arm.h index ab0618a..5c383c4 100644 --- a/elfcpp/arm.h +++ b/elfcpp/arm.h @@ -214,6 +214,8 @@ enum EF_ARM_EABI_VER3 = 0x03000000, EF_ARM_EABI_VER4 = 0x04000000, EF_ARM_EABI_VER5 = 0x05000000, + + EF_ARM_HASENTRY = 0x00000002, }; // Extract EABI version from flags. diff --git a/gold/arm.cc b/gold/arm.cc index 560f380..b3dd039 100644 --- a/gold/arm.cc +++ b/gold/arm.cc @@ -8693,6 +8693,9 @@ Target_arm::do_finalize_sections( merged_any_attributes = true; } + if (parameters->entry()) + this->set_processor_specific_flags(this->processor_specific_flags() | elfcpp::EF_ARM_HASENTRY); + // Create an empty uninitialized attribute section if we still don't have it // at this moment. This happens if there is no attributes sections in all // inputs. diff --git a/ld/emultempl/armelf.em b/ld/emultempl/armelf.em index 85e924f..ce3d688 100644 --- a/ld/emultempl/armelf.em +++ b/ld/emultempl/armelf.em @@ -531,6 +531,7 @@ PARSE_AND_LIST_PROLOGUE=' #define OPTION_NO_MERGE_EXIDX_ENTRIES 316 #define OPTION_FIX_ARM1176 317 #define OPTION_NO_FIX_ARM1176 318 +#define OPTION_LONG_PLT 319 ' PARSE_AND_LIST_SHORTOPTS=p @@ -555,6 +556,7 @@ PARSE_AND_LIST_LONGOPTS=' { "no-merge-exidx-entries", no_argument, NULL, OPTION_NO_MERGE_EXIDX_ENTRIES }, { "fix-arm1176", no_argument, NULL, OPTION_FIX_ARM1176 }, { "no-fix-arm1176", no_argument, NULL, OPTION_NO_FIX_ARM1176 }, + { "long-plt", no_argument, NULL, OPTION_LONG_PLT }, ' PARSE_AND_LIST_OPTIONS=' @@ -572,6 +574,8 @@ PARSE_AND_LIST_OPTIONS=' fprintf (file, _(" --no-wchar-size-warning Don'\''t warn about objects with incompatible\n" " wchar_t sizes\n")); fprintf (file, _(" --pic-veneer Always generate PIC interworking veneers\n")); + fprintf (file, _(" --long-plt Generate long .plt entries\n" + " to handle large .plt/.got displacements\n")); fprintf (file, _("\ --stub-group-size=N Maximum size of a group of input sections that\n\ can be handled by one stub section. A negative\n\ @@ -675,6 +679,10 @@ PARSE_AND_LIST_ARGS_CASES=' case OPTION_NO_FIX_ARM1176: fix_arm1176 = 0; break; + + case OPTION_LONG_PLT: + bfd_elf32_arm_use_long_plt (); + break; ' # We have our own before_allocation etc. functions, but they call