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From Cary Coutant: Correct generation of RELATIVE relocs.

This commit is contained in:
Ian Lance Taylor 2007-11-02 04:08:52 +00:00
parent fe906b004d
commit 86849f1fac
2 changed files with 105 additions and 39 deletions
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103
gold/i386.cc
View File

@ -151,6 +151,12 @@ class Target_i386 : public Sized_target<32, false>
}
}
// Return whether the static relocation needs to be applied.
inline bool
should_apply_static_reloc(const Sized_symbol<32>* gsym,
bool is_pcrel,
bool is_32bit);
// Do a relocation. Return false if the caller should not issue
// any warnings about this relocation.
inline bool
@ -772,12 +778,16 @@ Target_i386::Scan::local(const General_options&,
// relocate it easily.
if (parameters->output_is_position_independent())
{
// FIXME: R_386_RELATIVE only works for a 32-bit relocation.
gold_assert(r_type != elfcpp::R_386_16 && r_type != elfcpp::R_386_8);
Reloc_section* rel_dyn = target->rel_dyn_section(layout);
rel_dyn->add_local(object, 0, elfcpp::R_386_RELATIVE, data_shndx,
reloc.get_r_offset());
if (r_type == elfcpp::R_386_32)
rel_dyn->add_local(object, 0, elfcpp::R_386_RELATIVE, data_shndx,
reloc.get_r_offset());
else
{
unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
rel_dyn->add_local(object, r_sym, r_type, data_shndx,
reloc.get_r_offset());
}
}
break;
@ -973,15 +983,10 @@ Target_i386::Scan::global(const General_options& options,
gsym->set_needs_dynsym_value();
if (parameters->output_is_position_independent())
{
// FIXME: If this is an 8-bit or 16-bit
// relocation, R_386_RELATIVE won't work.
gold_assert(r_type != elfcpp::R_386_16
&& r_type != elfcpp::R_386_8);
Reloc_section* rel_dyn =
target->rel_dyn_section(layout);
rel_dyn->add_local(object, 0, elfcpp::R_386_RELATIVE,
data_shndx, reloc.get_r_offset());
rel_dyn->add_global(gsym, r_type, object, data_shndx,
reloc.get_r_offset());
}
}
}
@ -998,16 +1003,16 @@ Target_i386::Scan::global(const General_options& options,
}
else if (!is_pcrel && parameters->output_is_position_independent())
{
// FIXME: If this is an 8-bit or 16-bit relocation,
// R_386_RELATIVE won't work.
gold_assert(r_type != elfcpp::R_386_16
&& r_type != elfcpp::R_386_8);
// This is not a PC-relative reference, so we need to generate
// a dynamic relocation.
// a dynamic relocation. At this point, we know the symbol
// is not preemptible, so we can use the RELATIVE relocation.
Reloc_section* rel_dyn = target->rel_dyn_section(layout);
rel_dyn->add_local(object, 0, elfcpp::R_386_RELATIVE, data_shndx,
reloc.get_r_offset());
if (r_type == elfcpp::R_386_32)
rel_dyn->add_local(object, 0, elfcpp::R_386_RELATIVE, data_shndx,
reloc.get_r_offset());
else
rel_dyn->add_global(gsym, r_type, object, data_shndx,
reloc.get_r_offset());
}
}
break;
@ -1228,6 +1233,46 @@ Target_i386::do_finalize_sections(Layout* layout)
this->copy_relocs_ = NULL;
}
// Return whether a direct absolute static relocation needs to be applied.
// In cases where Scan::local() or Scan::global() has created
// a dynamic relocation other than R_386_RELATIVE, the addend
// of the relocation is carried in the data, and we must not
// apply the static relocation.
inline bool
Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol<32>* gsym,
bool is_pcrel,
bool is_32bit)
{
// For local symbols, return FALSE if a non-RELATIVE dynamic
// relocation was created; return TRUE otherwise.
if (gsym == NULL)
return (!parameters->output_is_position_independent() || is_32bit);
// For global symbols, mimic the logic in Scan::global()
// to decide whether a non-RELATIVE dynamic relocation was
// created.
// FIXME: This is ugly. Try to refactor this logic so it can be
// shared by Scan::global() and Relocate::relocate().
if (gsym->is_from_dynobj()
|| (parameters->output_is_shared()
&& gsym->is_preemptible()))
{
if (gsym->type() == elfcpp::STT_FUNC)
{
if (!is_pcrel && parameters->output_is_position_independent())
return false;
}
else
return false;
}
else if (!is_pcrel && parameters->output_is_position_independent())
return is_32bit;
// For all other cases, return TRUE
return true;
}
// Perform a relocation.
inline bool
@ -1305,27 +1350,33 @@ Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo,
break;
case elfcpp::R_386_32:
Relocate_functions<32, false>::rel32(view, object, psymval);
if (should_apply_static_reloc(gsym, false, true))
Relocate_functions<32, false>::rel32(view, object, psymval);
break;
case elfcpp::R_386_PC32:
Relocate_functions<32, false>::pcrel32(view, object, psymval, address);
if (should_apply_static_reloc(gsym, true, true))
Relocate_functions<32, false>::pcrel32(view, object, psymval, address);
break;
case elfcpp::R_386_16:
Relocate_functions<32, false>::rel16(view, object, psymval);
if (should_apply_static_reloc(gsym, false, false))
Relocate_functions<32, false>::rel16(view, object, psymval);
break;
case elfcpp::R_386_PC16:
Relocate_functions<32, false>::pcrel16(view, object, psymval, address);
if (should_apply_static_reloc(gsym, true, false))
Relocate_functions<32, false>::pcrel16(view, object, psymval, address);
break;
case elfcpp::R_386_8:
Relocate_functions<32, false>::rel8(view, object, psymval);
if (should_apply_static_reloc(gsym, false, false))
Relocate_functions<32, false>::rel8(view, object, psymval);
break;
case elfcpp::R_386_PC8:
Relocate_functions<32, false>::pcrel8(view, object, psymval, address);
if (should_apply_static_reloc(gsym, true, false))
Relocate_functions<32, false>::pcrel8(view, object, psymval, address);
break;
case elfcpp::R_386_PLT32:

41
gold/x86_64.cc
View File

@ -743,12 +743,17 @@ Target_x86_64::Scan::local(const General_options&,
// relocate it easily.
if (parameters->output_is_position_independent())
{
// FIXME: R_X86_64_RELATIVE assumes a 64-bit relocation.
gold_assert(r_type == elfcpp::R_X86_64_64);
Reloc_section* rela_dyn = target->rela_dyn_section(layout);
rela_dyn->add_local(object, 0, elfcpp::R_X86_64_RELATIVE,
data_shndx, reloc.get_r_offset(), 0);
if (r_type == elfcpp::R_X86_64_64)
rela_dyn->add_local(object, 0, elfcpp::R_X86_64_RELATIVE,
data_shndx, reloc.get_r_offset(), 0);
else
{
unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info());
rela_dyn->add_local(object, r_sym, r_type, data_shndx,
reloc.get_r_offset(),
reloc.get_r_addend());
}
}
break;
@ -946,16 +951,11 @@ Target_x86_64::Scan::global(const General_options& options,
gsym->set_needs_dynsym_value();
if (parameters->output_is_position_independent())
{
// FIXME: R_X86_64_RELATIVE assumes a 64-bit
// relocation.
gold_assert(r_type == elfcpp::R_X86_64_64);
Reloc_section* rela_dyn =
target->rela_dyn_section(layout);
rela_dyn->add_local(object, 0,
elfcpp::R_X86_64_RELATIVE,
data_shndx,
reloc.get_r_offset(), 0);
rela_dyn->add_global(gsym, r_type, object, data_shndx,
reloc.get_r_offset(),
reloc.get_r_addend());
}
}
}
@ -971,6 +971,21 @@ Target_x86_64::Scan::global(const General_options& options,
target->copy_reloc(&options, symtab, layout, object, data_shndx,
gsym, reloc);
}
else if (!is_pcrel && parameters->output_is_position_independent())
{
// This is not a PC-relative reference, so we need to generate
// a dynamic relocation. At this point, we know the symbol
// is not preemptible, so we can use the RELATIVE relocation.
Reloc_section* rela_dyn = target->rela_dyn_section(layout);
if (r_type == elfcpp::R_X86_64_64)
rela_dyn->add_local(object, 0, elfcpp::R_X86_64_RELATIVE,
data_shndx,
reloc.get_r_offset(), 0);
else
rela_dyn->add_global(gsym, r_type, object, data_shndx,
reloc.get_r_offset(),
reloc.get_r_addend());
}
}
break;