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From Craig Silverstein: Implement GOTPLT64 and PLTOFF64.

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This commit is contained in:
Ian Lance Taylor
2007-10-30 01:21:51 +00:00
parent 87aa5fb9f3
commit ee9e9e8644
1 changed files with 29 additions and 4 deletions
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33
gold/x86_64.cc
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@ -289,7 +289,6 @@ Target_x86_64::got_section(Symbol_table* symtab, Layout* layout)
// create another set of data in the .got section. Note that we // create another set of data in the .got section. Note that we
// always create a PLT if we create a GOT, although the PLT // always create a PLT if we create a GOT, although the PLT
// might be empty. // might be empty.
// TODO(csilvers): do we really need an alignment of 8?
this->got_plt_ = new Output_data_space(8); this->got_plt_ = new Output_data_space(8);
layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
@ -382,7 +381,6 @@ class Output_data_plt_x86_64 : public Output_section_data
Output_data_plt_x86_64::Output_data_plt_x86_64(Layout* layout, Output_data_plt_x86_64::Output_data_plt_x86_64(Layout* layout,
Output_data_space* got_plt) Output_data_space* got_plt)
// TODO(csilvers): do we really need an alignment of 8?
: Output_section_data(8), got_plt_(got_plt), count_(0) : Output_section_data(8), got_plt_(got_plt), count_(0)
{ {
this->rel_ = new Reloc_section(); this->rel_ = new Reloc_section();
@ -743,12 +741,15 @@ Target_x86_64::Scan::local(const General_options&,
case elfcpp::R_X86_64_PLTOFF64: case elfcpp::R_X86_64_PLTOFF64:
// We need a GOT section. // We need a GOT section.
target->got_section(symtab, layout); target->got_section(symtab, layout);
// For PLTOFF64, we'd normally want a PLT section, but since we
// know this is a local symbol, no PLT is needed.
break; break;
case elfcpp::R_X86_64_GOT64: case elfcpp::R_X86_64_GOT64:
case elfcpp::R_X86_64_GOT32: case elfcpp::R_X86_64_GOT32:
case elfcpp::R_X86_64_GOTPCREL64: case elfcpp::R_X86_64_GOTPCREL64:
case elfcpp::R_X86_64_GOTPCREL: case elfcpp::R_X86_64_GOTPCREL:
case elfcpp::R_X86_64_GOTPLT64:
{ {
// The symbol requires a GOT entry. // The symbol requires a GOT entry.
Output_data_got<64, false>* got = target->got_section(symtab, layout); Output_data_got<64, false>* got = target->got_section(symtab, layout);
@ -764,6 +765,8 @@ Target_x86_64::Scan::local(const General_options&,
data_shndx, reloc.get_r_offset(), 0); data_shndx, reloc.get_r_offset(), 0);
} }
} }
// For GOTPLT64, we'd normally want a PLT section, but since
// we know this is a local symbol, no PLT is needed.
} }
break; break;
@ -831,7 +834,6 @@ Target_x86_64::Scan::local(const General_options&,
} }
break; break;
case elfcpp::R_X86_64_GOTPLT64:
case elfcpp::R_X86_64_SIZE32: case elfcpp::R_X86_64_SIZE32:
case elfcpp::R_X86_64_SIZE64: case elfcpp::R_X86_64_SIZE64:
default: default:
@ -933,6 +935,11 @@ Target_x86_64::Scan::global(const General_options& options,
gsym->got_offset(), 0); gsym->got_offset(), 0);
} }
} }
// For GOTPLT64, we also need a PLT entry (but only if the
// symbol is not fully resolved).
if (r_type == elfcpp::R_X86_64_GOTPLT64
&& !gsym->final_value_is_known())
target->make_plt_entry(symtab, layout, gsym);
} }
break; break;
@ -950,6 +957,11 @@ Target_x86_64::Scan::global(const General_options& options,
case elfcpp::R_X86_64_PLTOFF64: case elfcpp::R_X86_64_PLTOFF64:
// We need a GOT section. // We need a GOT section.
target->got_section(symtab, layout); target->got_section(symtab, layout);
// For PLTOFF64, we also need a PLT entry (but only if the
// symbol is not fully resolved).
if (r_type == elfcpp::R_X86_64_PLTOFF64
&& !gsym->final_value_is_known())
target->make_plt_entry(symtab, layout, gsym);
break; break;
case elfcpp::R_X86_64_COPY: case elfcpp::R_X86_64_COPY:
@ -1239,10 +1251,24 @@ Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo,
gold_assert(gsym == NULL gold_assert(gsym == NULL
|| gsym->has_plt_offset() || gsym->has_plt_offset()
|| gsym->final_value_is_known()); || gsym->final_value_is_known());
// Note: while this code looks the same as for R_X86_64_PC32, it
// behaves differently because psymval was set to point to
// the PLT entry, rather than the symbol, in Scan::global().
Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, Relocate_functions<64, false>::pcrela32(view, object, psymval, addend,
address); address);
break; break;
case elfcpp::R_X86_64_PLTOFF64:
{
gold_assert(gsym);
gold_assert(gsym->has_plt_offset()
|| gsym->final_value_is_known());
elfcpp::Elf_types<64>::Elf_Addr got_address;
got_address = target->got_section(NULL, NULL)->address();
Relocate_functions<64, false>::pcrela64(view, object, psymval, addend,
- got_address);
}
case elfcpp::R_X86_64_GOT32: case elfcpp::R_X86_64_GOT32:
gold_assert(have_got_offset); gold_assert(have_got_offset);
Relocate_functions<64, false>::rela32(view, got_offset, addend); Relocate_functions<64, false>::rela32(view, got_offset, addend);
@ -1329,7 +1355,6 @@ Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo,
case elfcpp::R_X86_64_SIZE32: case elfcpp::R_X86_64_SIZE32:
case elfcpp::R_X86_64_SIZE64: case elfcpp::R_X86_64_SIZE64:
case elfcpp::R_X86_64_PLTOFF64: // FIXME: implement me!
default: default:
gold_error_at_location(relinfo, relnum, rela.get_r_offset(), gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
_("unsupported reloc %u"), _("unsupported reloc %u"),