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author | Ian Lance Taylor <ian@airs.com> | 1994-10-21 22:00:18 +0000 |
---|---|---|
committer | Ian Lance Taylor <ian@airs.com> | 1994-10-21 22:00:18 +0000 |
commit | 12662be4fe2722e3186c865332166ec2d6bcb5da (patch) | |
tree | 9aa0a8fa8e2243ae39ed773725d97231f80c26d0 /bfd/elf32-i386.c | |
parent | 6b55e5e3b9c8cfb439d3a11c6afbb071a927fbf8 (diff) | |
download | gdb-12662be4fe2722e3186c865332166ec2d6bcb5da.zip gdb-12662be4fe2722e3186c865332166ec2d6bcb5da.tar.gz gdb-12662be4fe2722e3186c865332166ec2d6bcb5da.tar.bz2 |
Fix the ELF linker to not require an interpreter if no dynamic
objects were seen, even when linking PIC code.
* libelf.h (ELF_LINK_HASH_NEEDS_PLT): Define.
(struct elf_link_hash_table): Add field dynamic_sections_created.
* elfcode.h (elf_link_record_dynamic_symbol): Create dynstr if it
doesn't already exist.
(elf_link_add_object_symbols): Create dynamic sections based on
dynamic_sections_created field, not dynobj field. Don't bother to
set dynobj.
(elf_link_create_dynamic_sections): If dynamic sections were
already created, don't do anything. If dynobj is already set, use
it; otherwise, set it to the bfd argument. Don't initialize
dynsymcount. Only create dynstr if it does not exist. Set
dynamic_sections_created to true.
(NAME(bfd_elf,size_dynamic_sections)): Skip most of this function
if no dynamic objects were seen.
(elf_adjust_dynamic_symbol): If a symbol has the
ELF_LINK_HASH_NEEDS_PLT flag set, let the backend adjust it.
(elf_bfd_final_link): Change most decisions based on dynobj to
check dynamic_sections_created instead.
(elf_link_output_extsym): Only handle dynamic symbols if a dynamic
object was seen.
* elf.c (_bfd_elf_link_hash_table_init): Initialize new field
dynamic_sections_created. Set dynsymcount to 1, not 0.
* elf32-i386.c (elf_i386_create_dynamic_sections): Call
elf_i386_create_got_section rather than creating the .got and
.got.plt sections.
(elf_i386_create_got_section): New static function.
(elf_i386_check_relocs): Just call elf_i386_create_got_section if
a GOT table is needed, not bfd_elf32_link_create_dynamic_sections.
Only create the .rel.got section, and only make space for a reloc,
for a global symbol or when generating a shared object. For a
R_386_PLT32 reloc, just set the ELF_LINK_HASH_NEEDS_PLT flag.
(elf_i386_adjust_dynamic_symbol): Rework initial assertion to
permit ELF_LINK_HASH_NEEDS_PLT non dynamic symbols. Create a
procedure linkage table entry for such symbols. But, if no
dynamic objects were seen, never create a PLT entry.
(elf_i386_size_dynamic_sections): If no dynamic objects were seen,
skip most of this function, and force the size of the .rel.got
section to zero.
(elf_i386_relocate_section): For a R_386_GOT32 reloc against a global
symbol when no dynamic object was seen, initialize the contents of
the .got section. For a R_386_GOT32 against a local symbol, only
create a R_386_RELATIVE reloc when generating a shared object.
Treat a R_386_PLT32 reloc against a symbol for which we did not
create a PLT entry as a R_386_PC32 reloc.
(elf_i386_finish_dynamic_sections): Only fiddle with the dynamic
entries and the PLT if we saw a dynamic object.
* elf32-sparc.c (elf_sparc_howto_table): Fix R_SPARC_PC22 by
setting rightshift to 10. Fix R_SPARC_WPLT20 by setting
rightshift to 2, size to 2, bitsize to 30, and dst_mask to
0x3fffffff.
(elf32_sparc_create_dynamic_sections): Don't set the size of the
.plt section. Call elf32_sparc_create_got_section rather than
creating the .got section.
(elf32_sparc_check_relocs): Call elf32_sparc_create_got_section if
a GOT table is needed, not bfd_elf32_link_create_dynamic_sections.
Only create the .rela.got section, and only make space for a
reloc, for a global symbol or when generating a shared object.
Set the alignment of the .rela.got section to 2. For a
R_SPARC_WPLT30 reloc, just set the ELF_LINK_HASH_NEEDS_PLT flag.
(elf32_sparc_adjust_dynamic_symbol): Rework initial assertion to
permit ELF_LINK_HASH_NEDS_PLT non dynamic symbols. Create a
procedure linkage table for such symbols. But, if no dynamic
objects were seen, never create a PLT entry. Initialize the size
of the .plt section.
(elf32_sparc_size_dynamic_sections): If no dynamic objects were
seen, skip most of this function, and force the size of the
.rela.got section to zero. Strip empty reloc sections, and strip
an empty .plt section.
(elf32_sparc_relocate_section): For a GOT reloc against a global
symbol when no dynamic object was seen, initialize the contents of
the .got section. For a GOT reloc against a local symbol, only
create a R_SPARC_RELATIVE reloc when generating a shared object.
Treat a R_SPARC_WPLT30 reloc against a symbol for which we did not
create a PLT entry as a R_SPARC_WDISP30 reloc.
(elf32_sparc_finish_dynamic_sections): Only fiddle with the
dynamic entries and the PLT if we saw a dynamic object.
Diffstat (limited to 'bfd/elf32-i386.c')
-rw-r--r-- | bfd/elf32-i386.c | 547 |
1 files changed, 310 insertions, 237 deletions
diff --git a/bfd/elf32-i386.c b/bfd/elf32-i386.c index 4d13c88..eb6a411 100644 --- a/bfd/elf32-i386.c +++ b/bfd/elf32-i386.c @@ -31,6 +31,8 @@ static void elf_i386_info_to_howto_rel PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *)); static boolean elf_i386_create_dynamic_sections PARAMS ((bfd *, struct bfd_link_info *)); +static boolean elf_i386_create_got_section + PARAMS ((bfd *, struct bfd_link_info *)); static boolean elf_i386_check_relocs PARAMS ((bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *)); @@ -269,39 +271,9 @@ elf_i386_create_dynamic_sections (abfd, info) || ! bfd_set_section_alignment (abfd, s, 2)) return false; - s = bfd_make_section (abfd, ".got"); - if (s == NULL - || ! bfd_set_section_flags (abfd, s, flags) - || ! bfd_set_section_alignment (abfd, s, 2)) - return false; - - s = bfd_make_section (abfd, ".got.plt"); - if (s == NULL - || ! bfd_set_section_flags (abfd, s, flags) - || ! bfd_set_section_alignment (abfd, s, 2)) - return false; - - /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the - .got.plt section, which will be placed at the start of the output - .got section. We don't do this in the linker script because we - don't want to define the symbol if we are not creating a global - offset table. */ - h = NULL; - if (! (_bfd_generic_link_add_one_symbol - (info, abfd, "_GLOBAL_OFFSET_TABLE_", BSF_GLOBAL, s, (bfd_vma) 0, - (const char *) NULL, false, get_elf_backend_data (abfd)->collect, - (struct bfd_link_hash_entry **) &h))) - return false; - h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR; - h->type = STT_OBJECT; - - if (info->shared - && ! bfd_elf32_link_record_dynamic_symbol (info, h)) + if (! elf_i386_create_got_section (abfd, info)) return false; - /* The first three global offset table entries are reserved. */ - s->_raw_size += 3 * 4; - /* The .dynbss section is a place to put symbols which are defined by dynamic objects, are referenced by regular objects, and are not functions. We must allocate space for them in the process @@ -336,6 +308,61 @@ elf_i386_create_dynamic_sections (abfd, info) return true; } +/* Create the .got section to hold the global offset table, and the + .got.plt section to hold procedure linkage table GOT entries. The + linker script will put .got.plt into the output .got section. */ + +static boolean +elf_i386_create_got_section (abfd, info) + bfd *abfd; + struct bfd_link_info *info; +{ + flagword flags; + register asection *s; + struct elf_link_hash_entry *h; + + /* This function may be called more than once. */ + if (bfd_get_section_by_name (abfd, ".got") != NULL) + return true; + + flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY; + + s = bfd_make_section (abfd, ".got"); + if (s == NULL + || ! bfd_set_section_flags (abfd, s, flags) + || ! bfd_set_section_alignment (abfd, s, 2)) + return false; + + s = bfd_make_section (abfd, ".got.plt"); + if (s == NULL + || ! bfd_set_section_flags (abfd, s, flags) + || ! bfd_set_section_alignment (abfd, s, 2)) + return false; + + /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the + .got.plt section, which will be placed at the start of the output + .got section. We don't do this in the linker script because we + don't want to define the symbol if we are not creating a global + offset table. */ + h = NULL; + if (! (_bfd_generic_link_add_one_symbol + (info, abfd, "_GLOBAL_OFFSET_TABLE_", BSF_GLOBAL, s, (bfd_vma) 0, + (const char *) NULL, false, get_elf_backend_data (abfd)->collect, + (struct bfd_link_hash_entry **) &h))) + return false; + h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR; + h->type = STT_OBJECT; + + if (info->shared + && ! bfd_elf32_link_record_dynamic_symbol (info, h)) + return false; + + /* The first three global offset table entries are reserved. */ + s->_raw_size += 3 * 4; + + 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. */ @@ -355,9 +382,6 @@ elf_i386_check_relocs (abfd, info, sec, relocs) const Elf_Internal_Rela *rel_end; asection *sgot; asection *srelgot; - asection *splt; - asection *sgotplt; - asection *srelplt; asection *sreloc; if (info->relocateable) @@ -370,9 +394,6 @@ elf_i386_check_relocs (abfd, info, sec, relocs) sgot = NULL; srelgot = NULL; - splt = NULL; - sgotplt = NULL; - srelplt = NULL; sreloc = NULL; rel_end = relocs + sec->reloc_count; @@ -388,20 +409,16 @@ elf_i386_check_relocs (abfd, info, sec, relocs) else h = sym_hashes[r_symndx - symtab_hdr->sh_info]; - /* Some relocs require a global offset table. FIXME: If this is - a static link of PIC code, we need a global offset table but - we don't really need to create the full dynamic linking - information. */ + /* Some relocs require a global offset table. */ if (dynobj == NULL) { switch (ELF32_R_TYPE (rel->r_info)) { case R_386_GOT32: - case R_386_PLT32: case R_386_GOTOFF: case R_386_GOTPC: elf_hash_table (info)->dynobj = dynobj = abfd; - if (! bfd_elf32_link_create_dynamic_sections (dynobj, info)) + if (! elf_i386_create_got_section (dynobj, info)) return false; break; @@ -418,6 +435,12 @@ elf_i386_check_relocs (abfd, info, sec, relocs) 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, ".rel.got"); if (srelgot == NULL) { @@ -432,7 +455,6 @@ elf_i386_check_relocs (abfd, info, sec, relocs) || ! bfd_set_section_alignment (dynobj, srelgot, 2)) return false; } - BFD_ASSERT (sgot != NULL && srelgot != NULL); } if (h != NULL) @@ -450,6 +472,8 @@ elf_i386_check_relocs (abfd, info, sec, relocs) if (! bfd_elf32_link_record_dynamic_symbol (info, h)) return false; } + + srelgot->_raw_size += sizeof (Elf32_External_Rel); } else { @@ -477,41 +501,32 @@ elf_i386_check_relocs (abfd, info, sec, relocs) break; } local_got_offsets[r_symndx] = sgot->_raw_size; + + if (info->shared) + { + /* If we are generating a shared object, we need to + output a R_386_RELATIVE reloc so that the dynamic + linker can adjust this GOT entry. */ + srelgot->_raw_size += sizeof (Elf32_External_Rel); + } } sgot->_raw_size += 4; - srelgot->_raw_size += sizeof (Elf32_External_Rel); break; case R_386_PLT32: - /* This symbol requires a procedure linkage table entry. */ + /* 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 without + linking in any dynamic objects, in which case we don't + need to generate a procedure linkage table after all. */ /* If this is a local symbol, we resolve it directly without creating a procedure linkage table entry. */ if (h == NULL) continue; - if (h->plt_offset != (bfd_vma) -1) - { - /* There is already an entry for this symbol in the - procedure linkage table. */ - break; - } - - if (splt == NULL) - { - splt = bfd_get_section_by_name (dynobj, ".plt"); - sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); - srelplt = bfd_get_section_by_name (dynobj, ".rel.plt"); - BFD_ASSERT (splt != NULL && sgotplt != NULL && srelplt != NULL); - } - - /* If this is the first .plt entry, make room for the - special first entry. */ - if (splt->_raw_size == 0) - splt->_raw_size += PLT_ENTRY_SIZE; - /* Make sure this symbol is output as a dynamic symbol. */ if (h->dynindx == -1) { @@ -519,15 +534,7 @@ elf_i386_check_relocs (abfd, info, sec, relocs) return false; } - h->plt_offset = splt->_raw_size; - - /* Make room for this entry. We need a procedure linkage - table entry in .plt, a global offset table entry in - .got.plt (which is placed in .got by the linker script), - and a relocation in .rel.plt. */ - splt->_raw_size += PLT_ENTRY_SIZE; - sgotplt->_raw_size += 4; - srelplt->_raw_size += sizeof (Elf32_External_Rel); + h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; break; @@ -602,59 +609,66 @@ elf_i386_adjust_dynamic_symbol (info, h) /* Make sure we know what is going on here. */ BFD_ASSERT (dynobj != 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 && h->root.type == bfd_link_hash_defined && (bfd_get_flavour (h->root.u.def.section->owner) == bfd_target_elf_flavour) - && (elf_elfheader (h->root.u.def.section->owner)->e_type - == ET_DYN) - && h->root.u.def.section->output_section == NULL); + && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) + || ((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 + && (elf_elfheader (h->root.u.def.section->owner)->e_type + == ET_DYN) + && h->root.u.def.section->output_section == NULL))); /* 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) + if (h->type == STT_FUNC + || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) { + if (! elf_hash_table (info)->dynamic_sections_created) + { + /* This case can occur if we saw a PLT32 reloc in an input + file, but none of the input files were dynamic objects. + In such a case, we don't actually need to build a + procedure linkage table, and we can just do a PC32 reloc + instead. */ + BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0); + return true; + } + s = bfd_get_section_by_name (dynobj, ".plt"); BFD_ASSERT (s != NULL); - if (h->plt_offset != (bfd_vma) -1) - { - h->root.u.def.section = s; - h->root.u.def.value = h->plt_offset; - } - else - { - /* If this is the first .plt entry, make room for the - special first entry. */ - if (s->_raw_size == 0) - s->_raw_size += PLT_ENTRY_SIZE; + /* If this is the first .plt entry, make room for the special + first entry. */ + if (s->_raw_size == 0) + s->_raw_size += PLT_ENTRY_SIZE; - /* Set the symbol to this location in the .plt. */ - h->root.u.def.section = s; - h->root.u.def.value = s->_raw_size; + /* Set the symbol to this location in the .plt. */ + h->root.u.def.section = s; + h->root.u.def.value = s->_raw_size; - h->plt_offset = s->_raw_size; + h->plt_offset = s->_raw_size; - /* Make room for this entry. */ - s->_raw_size += PLT_ENTRY_SIZE; + /* Make room for this entry. */ + 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. */ + /* 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; + 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 .rel.plt section. */ + /* We also need to make an entry in the .rel.plt section. */ - s = bfd_get_section_by_name (dynobj, ".rel.plt"); - BFD_ASSERT (s != NULL); - s->_raw_size += sizeof (Elf32_External_Rel); - } + s = bfd_get_section_by_name (dynobj, ".rel.plt"); + BFD_ASSERT (s != NULL); + s->_raw_size += sizeof (Elf32_External_Rel); return true; } @@ -751,13 +765,27 @@ elf_i386_size_dynamic_sections (output_bfd, info) dynobj = elf_hash_table (info)->dynobj; BFD_ASSERT (dynobj != NULL); - /* Set the contents of the .interp section to the interpreter. */ - if (! info->shared) + if (elf_hash_table (info)->dynamic_sections_created) { - 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; + /* Set the contents of the .interp section to the interpreter. */ + if (! info->shared) + { + 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 .rel.got section. + However, if we are not creating the dynamic sections, we will + not actually use these entries. Reset the size of .rel.got, + which will cause it to get stripped from the output file + below. */ + s = bfd_get_section_by_name (dynobj, ".rel.got"); + if (s != NULL) + s->_raw_size = 0; } /* The check_relocs and adjust_dynamic_symbol entry points have @@ -859,39 +887,42 @@ elf_i386_size_dynamic_sections (output_bfd, info) } } - /* Add some entries to the .dynamic section. We fill in the values - later, in elf_i386_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. */ - if (! info->shared) + if (elf_hash_table (info)->dynamic_sections_created) { - if (! bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0)) - return false; - } + /* Add some entries to the .dynamic section. We fill in the + values later, in elf_i386_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. */ + if (! info->shared) + { + if (! bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0)) + return false; + } - if (plt) - { - if (! bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0) - || ! bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0) - || ! bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_REL) - || ! bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0)) - return false; - } + if (plt) + { + if (! bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0) + || ! bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0) + || ! bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_REL) + || ! bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0)) + return false; + } - if (relocs) - { - if (! bfd_elf32_add_dynamic_entry (info, DT_REL, 0) - || ! bfd_elf32_add_dynamic_entry (info, DT_RELSZ, 0) - || ! bfd_elf32_add_dynamic_entry (info, DT_RELENT, - sizeof (Elf32_External_Rel))) - return false; - } + if (relocs) + { + if (! bfd_elf32_add_dynamic_entry (info, DT_REL, 0) + || ! bfd_elf32_add_dynamic_entry (info, DT_RELSZ, 0) + || ! bfd_elf32_add_dynamic_entry (info, DT_RELENT, + sizeof (Elf32_External_Rel))) + return false; + } - if (reltext) - { - if (! bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0)) - return false; + if (reltext) + { + if (! bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0)) + return false; + } } return true; @@ -910,7 +941,6 @@ elf_i386_relocate_section (output_bfd, info, input_bfd, input_section, Elf_Internal_Rela *relocs; Elf_Internal_Sym *local_syms; asection **local_sections; - char *output_names; { bfd *dynobj; Elf_Internal_Shdr *symtab_hdr; @@ -1026,8 +1056,33 @@ elf_i386_relocate_section (output_bfd, info, input_bfd, input_section, if (h != NULL) { - BFD_ASSERT (h->got_offset != (bfd_vma) -1); - relocation = sgot->output_offset + h->got_offset; + bfd_vma off; + + off = h->got_offset; + BFD_ASSERT (off != (bfd_vma) -1); + + if (! elf_hash_table (info)->dynamic_sections_created) + { + /* This is actually a static link. 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 .rel.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; + } + } + + relocation = sgot->output_offset + off; } else { @@ -1045,23 +1100,26 @@ elf_i386_relocate_section (output_bfd, info, input_bfd, input_section, off &= ~1; else { - asection *srelgot; - Elf_Internal_Rel outrel; - bfd_put_32 (output_bfd, relocation, sgot->contents + off); - srelgot = bfd_get_section_by_name (dynobj, ".rel.got"); - BFD_ASSERT (srelgot != NULL); - - outrel.r_offset = (sgot->output_section->vma - + sgot->output_offset - + off); - outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); - bfd_elf32_swap_reloc_out (output_bfd, &outrel, - (((Elf32_External_Rel *) - srelgot->contents) - + srelgot->reloc_count)); - ++srelgot->reloc_count; + if (info->shared) + { + asection *srelgot; + Elf_Internal_Rel outrel; + + srelgot = bfd_get_section_by_name (dynobj, ".rel.got"); + BFD_ASSERT (srelgot != NULL); + + outrel.r_offset = (sgot->output_section->vma + + sgot->output_offset + + off); + outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); + bfd_elf32_swap_reloc_out (output_bfd, &outrel, + (((Elf32_External_Rel *) + srelgot->contents) + + srelgot->reloc_count)); + ++srelgot->reloc_count; + } local_got_offsets[r_symndx] |= 1; } @@ -1112,13 +1170,19 @@ elf_i386_relocate_section (output_bfd, info, input_bfd, input_section, if (h == NULL) break; + if (h->plt_offset == (bfd_vma) -1) + { + /* We didn't make a PLT entry for this symbol. This + happens when statically linking PIC code. */ + break; + } + if (splt == NULL) { splt = bfd_get_section_by_name (dynobj, ".plt"); BFD_ASSERT (splt != NULL); } - BFD_ASSERT (h != NULL && h->plt_offset != (bfd_vma) -1); relocation = (splt->output_section->vma + splt->output_offset + h->plt_offset); @@ -1161,7 +1225,7 @@ elf_i386_relocate_section (output_bfd, info, input_bfd, input_section, + input_section->output_offset); if (r_type == R_386_PC32) { - BFD_ASSERT (h != NULL && h->dynindx != (bfd_vma) -1); + BFD_ASSERT (h != NULL && h->dynindx != -1); outrel.r_info = ELF32_R_INFO (h->dynindx, R_386_PC32); } else @@ -1395,111 +1459,120 @@ elf_i386_finish_dynamic_sections (output_bfd, info) struct bfd_link_info *info; { bfd *dynobj; - asection *splt; asection *sgot; asection *sdyn; - Elf32_External_Dyn *dyncon, *dynconend; dynobj = elf_hash_table (info)->dynobj; - splt = bfd_get_section_by_name (dynobj, ".plt"); sgot = bfd_get_section_by_name (dynobj, ".got.plt"); + BFD_ASSERT (sgot != NULL); sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); - BFD_ASSERT (splt != NULL && sgot != NULL && sdyn != NULL); - dyncon = (Elf32_External_Dyn *) sdyn->contents; - dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size); - for (; dyncon < dynconend; dyncon++) + if (elf_hash_table (info)->dynamic_sections_created) { - Elf_Internal_Dyn dyn; - const char *name; - asection *s; + asection *splt; + Elf32_External_Dyn *dyncon, *dynconend; - bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); + splt = bfd_get_section_by_name (dynobj, ".plt"); + BFD_ASSERT (splt != NULL && sdyn != NULL); - switch (dyn.d_tag) + dyncon = (Elf32_External_Dyn *) sdyn->contents; + dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size); + for (; dyncon < dynconend; dyncon++) { - default: - break; + Elf_Internal_Dyn dyn; + const char *name; + asection *s; - case DT_PLTGOT: - name = ".got"; - goto get_vma; - case DT_JMPREL: - name = ".rel.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, ".rel.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; + bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); - case DT_RELSZ: - /* My reading of the SVR4 ABI indicates that the procedure - linkage table relocs (DT_JMPREL) should be included in - the overall relocs (DT_REL). This is what Solaris does. - However, UnixWare can not handle that case. Therefore, - we override the DT_RELSZ entry here to make it not - include the JMPREL relocs. Since the linker script - arranges for .rel.plt to follow all other relocation - sections, we don't have to worry about changing the - DT_REL entry. */ - s = bfd_get_section_by_name (output_bfd, ".rel.plt"); - if (s != NULL) + switch (dyn.d_tag) { + default: + break; + + case DT_PLTGOT: + name = ".got"; + goto get_vma; + case DT_JMPREL: + name = ".rel.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, ".rel.plt"); + BFD_ASSERT (s != NULL); if (s->_cooked_size != 0) - dyn.d_un.d_val -= s->_cooked_size; + dyn.d_un.d_val = s->_cooked_size; else - dyn.d_un.d_val -= s->_raw_size; + dyn.d_un.d_val = s->_raw_size; + bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); + break; + + case DT_RELSZ: + /* My reading of the SVR4 ABI indicates that the + procedure linkage table relocs (DT_JMPREL) should be + included in the overall relocs (DT_REL). This is + what Solaris does. However, UnixWare can not handle + that case. Therefore, we override the DT_RELSZ entry + here to make it not include the JMPREL relocs. Since + the linker script arranges for .rel.plt to follow all + other relocation sections, we don't have to worry + about changing the DT_REL entry. */ + s = bfd_get_section_by_name (output_bfd, ".rel.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; } - 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 (info->shared) - memcpy (splt->contents, elf_i386_pic_plt0_entry, PLT_ENTRY_SIZE); - else + /* Fill in the first entry in the procedure linkage table. */ + if (splt->_raw_size > 0) { - memcpy (splt->contents, elf_i386_plt0_entry, PLT_ENTRY_SIZE); - bfd_put_32 (output_bfd, - sgot->output_section->vma + sgot->output_offset + 4, - splt->contents + 2); - bfd_put_32 (output_bfd, - sgot->output_section->vma + sgot->output_offset + 8, - splt->contents + 8); + if (info->shared) + memcpy (splt->contents, elf_i386_pic_plt0_entry, PLT_ENTRY_SIZE); + else + { + memcpy (splt->contents, elf_i386_plt0_entry, PLT_ENTRY_SIZE); + bfd_put_32 (output_bfd, + sgot->output_section->vma + sgot->output_offset + 4, + splt->contents + 2); + bfd_put_32 (output_bfd, + sgot->output_section->vma + sgot->output_offset + 8, + splt->contents + 8); + } } + + /* UnixWare sets the entsize of .plt to 4, although that doesn't + really seem like the right value. */ + elf_section_data (splt->output_section)->this_hdr.sh_entsize = 4; } /* Fill in the first three entries in the global offset table. */ if (sgot->_raw_size > 0) { - bfd_put_32 (output_bfd, - sdyn->output_section->vma + sdyn->output_offset, - sgot->contents); + 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; - /* UnixWare sets the entsize of .plt to 4, although that doesn't - really seem like the right value. */ - elf_section_data (splt->output_section)->this_hdr.sh_entsize = 4; - return true; } |