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Correct handling of addends in merged sections.

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This commit is contained in:
Ian Lance Taylor 2007-10-06 05:40:44 +00:00
parent 15bed04447
commit 063f12a825
2 changed files with 41 additions and 11 deletions
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26
gold/object.cc
View File

@ -586,6 +586,9 @@ Sized_relobj<size, big_endian>::do_finalize_local_symbols(unsigned int index,
unsigned int shndx = sym.get_st_shndx();
lv.set_input_shndx(shndx);
if (sym.get_st_type() == elfcpp::STT_SECTION)
lv.set_is_section_symbol();
if (shndx >= elfcpp::SHN_LORESERVE)
{
if (shndx == elfcpp::SHN_ABS)
@ -660,12 +663,14 @@ Sized_relobj<size, big_endian>::do_finalize_local_symbols(unsigned int index,
}
// Return the value of a local symbol defined in input section SHNDX,
// with value VALUE, adding addend ADDEND. This handles SHF_MERGE
// sections.
// with value VALUE, adding addend ADDEND. IS_SECTION_SYMBOL
// indicates whether the symbol is a section symbol. This handles
// SHF_MERGE sections.
template<int size, bool big_endian>
typename elfcpp::Elf_types<size>::Elf_Addr
Sized_relobj<size, big_endian>::local_value(unsigned int shndx,
Address value,
bool is_section_symbol,
Address addend) const
{
const std::vector<Map_to_output>& mo(this->map_to_output());
@ -673,7 +678,22 @@ Sized_relobj<size, big_endian>::local_value(unsigned int shndx,
if (os == NULL)
return addend;
gold_assert(mo[shndx].offset == -1);
return os->output_address(this, shndx, value + addend);
// Do the mapping required by the output section. If this is not a
// section symbol, then we want to map the symbol value, and then
// include the addend. If this is a section symbol, then we need to
// include the addend to figure out where in the section we are,
// before we do the mapping. This will do the right thing provided
// the assembler is careful to only convert a relocation in a merged
// section to a section symbol if there is a zero addend. If the
// assembler does not do this, then in general we can't know what to
// do, because we can't distinguish the addend for the instruction
// format from the addend for the section offset.
if (is_section_symbol)
return os->output_address(this, shndx, value + addend);
else
return addend + os->output_address(this, shndx, value);
}
// Write out the local symbols.

26
gold/object.h
View File

@ -487,8 +487,8 @@ class Symbol_value
typedef typename elfcpp::Elf_types<size>::Elf_Addr Value;
Symbol_value()
: output_symtab_index_(0), input_shndx_(0), needs_output_address_(false),
value_(0)
: output_symtab_index_(0), input_shndx_(0), is_section_symbol_(false),
needs_output_address_(false), value_(0)
{ }
// Get the value of this symbol. OBJECT is the object in which this
@ -499,7 +499,8 @@ class Symbol_value
{
if (!this->needs_output_address_)
return this->value_ + addend;
return object->local_value(this->input_shndx_, this->value_, addend);
return object->local_value(this->input_shndx_, this->value_,
this->is_section_symbol_, addend);
}
// Set the value of this symbol in the output symbol table.
@ -560,16 +561,23 @@ class Symbol_value
set_input_shndx(unsigned int i)
{ this->input_shndx_ = i; }
// Record that this is a section symbol.
void
set_is_section_symbol()
{ this->is_section_symbol_ = true; }
private:
// The index of this local symbol in the output symbol table. This
// will be -1 if the symbol should not go into the symbol table.
unsigned int output_symtab_index_;
// The section index in the input file in which this symbol is
// defined.
unsigned int input_shndx_ : 31;
unsigned int input_shndx_ : 30;
// Whether this is a STT_SECTION symbol.
bool is_section_symbol_ : 1;
// Whether getting the value of this symbol requires calling an
// Output_section method. For example, this will be true of a
// STT_SECTION symbol in a SHF_MERGE section.
// symbol in a SHF_MERGE section.
bool needs_output_address_ : 1;
// The value of the symbol. If !needs_output_address_, this is the
// value in the output file. If needs_output_address_, this is the
@ -660,10 +668,12 @@ class Sized_relobj : public Relobj
}
// Return the value of a local symbol define in input section SHNDX,
// with value VALUE, adding addend ADDEND. This handles SHF_MERGE
// sections.
// with value VALUE, adding addend ADDEND. IS_SECTION_SYMBOL
// indicates whether the symbol is a section symbol. This handles
// SHF_MERGE sections.
Address
local_value(unsigned int shndx, Address value, Address addend) const;
local_value(unsigned int shndx, Address value, bool is_section_symbol,
Address addend) const;
private:
// For convenience.