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From Craig Silverstein: set symbol value for function pointer

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equality across shared library boundaries.
This commit is contained in:
Ian Lance Taylor 2007-10-03 05:40:11 +00:00
parent 6f08d80e81
commit 4fb6c25d50
1 changed files with 30 additions and 1 deletions
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31
gold/x86_64.cc
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@ -86,6 +86,11 @@ class Target_x86_64 : public Sized_target<64, false>
void
do_finalize_sections(Layout*);
// Return the value to use for a dynamic which requires special
// treatment.
uint64_t
do_dynsym_value(const Symbol*) const;
// Relocate a section.
void
relocate_section(const Relocate_info<64, false>*,
@ -849,7 +854,19 @@ Target_x86_64::Scan::global(const General_options& options,
// function, we make a PLT entry. Otherwise we need to
// either generate a COPY reloc or copy this reloc.
if (gsym->type() == elfcpp::STT_FUNC)
target->make_plt_entry(symtab, layout, gsym);
{
target->make_plt_entry(symtab, layout, gsym);
// If this is not a PC relative reference, then we may
// be taking the address of the function. In that case
// we need to set the entry in the dynamic symbol table
// to the address of the PLT entry.
if (r_type != elfcpp::R_X86_64_PC64
&& r_type != elfcpp::R_X86_64_PC32
&& r_type != elfcpp::R_X86_64_PC16
&& r_type != elfcpp::R_X86_64_PC8)
gsym->set_needs_dynsym_value();
}
else
target->copy_reloc(&options, symtab, layout, object, data_shndx,
gsym, reloc);
@ -1608,6 +1625,18 @@ Target_x86_64::relocate_section(const Relocate_info<64, false>* relinfo,
view_size);
}
// Return the value to use for a dynamic which requires special
// treatment. This is how we support equality comparisons of function
// pointers across shared library boundaries, as described in the
// processor specific ABI supplement.
uint64_t
Target_x86_64::do_dynsym_value(const Symbol* gsym) const
{
gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
return this->plt_section()->address() + gsym->plt_offset();
}
// Return a string used to fill a code section with nops to take up
// the specified length.