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Add support for STT_SPARC_REGISTER symbols.

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gold/
	PR gold/19019
	* layout.h (Layout::add_target_specific_dynamic_tag): New function.
	* layout.cc (Layout::add_target_specific_dynamic_tag): New function.
	* mips.cc (Target_mips::make_symbol): Adjust function signature.
	* sparc.cc (Target_sparc::Target_sparc): Initialize register_syms_.
	(Target_sparc::do_is_defined_by_abi): Remove test for
	STT_SPARC_REGISTER.
	(Target_sparc::Register_symbol): New struct type.
	(Target_sparc::register_syms_): New data member.
	(Target_sparc<64, true>::sparc_info): Set has_make_symbol to true.
	(Target_sparc::make_symbol): New function.
	(Target_sparc::do_finalize_sections): Add register symbols and new
	dynamic table entries.
	* symtab.h (Sized_symbol::init_undefined): Add value parameter.
	(Symbol_table::add_target_global_symbol): New function.
	(Symbol_table::target_symbols_): New data member.
	* symtab.cc (Sized_symbol::init_undefined): Add value parameter.
	(Symbol_table::Symbol_table): Initialize target_symbols_.
	(Symbol_table::add_from_object): Pass additional parameters to
	Target::make_symbol.
	(Symbol_table::define_special_symbol): Likewise.
	(Symbol_table::add_undefined_symbol_from_command_line): Pass 0 for
	undefined symbol value.
	(Symbol_table::set_dynsym_indexes): Process target-specific symbols.
	(Symbol_table::sized_finalize): Likewise.
	(Symbol_table::sized_write_globals): Likewise.
	* target.h (Sized_target::make_symbol): Add name, st_type, object,
	st_shndx, and value parameters.
This commit is contained in:
Cary Coutant
2016-02-04 16:55:39 -08:00
parent 8b4ee0a5c1
commit dc1c8a16a3
8 changed files with 236 additions and 20 deletions
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111
gold/sparc.cc
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@@ -62,10 +62,14 @@ class Target_sparc : public Sized_target<size, big_endian>
copy_relocs_(elfcpp::R_SPARC_COPY),
got_mod_index_offset_(-1U), tls_get_addr_sym_(NULL),
elf_machine_(sparc_info.machine_code), elf_flags_(0),
elf_flags_set_(false)
elf_flags_set_(false), register_syms_()
{
}
// Make a new symbol table entry.
Sized_symbol<size>*
make_symbol(const char*, elfcpp::STT, Object*, unsigned int, uint64_t);
// Process the relocations to determine unreferenced sections for
// garbage collection.
void
@@ -164,13 +168,7 @@ class Target_sparc : public Sized_target<size, big_endian>
// Return whether SYM is defined by the ABI.
bool
do_is_defined_by_abi(const Symbol* sym) const
{
// XXX Really need to support this better...
if (sym->type() == elfcpp::STT_SPARC_REGISTER)
return 1;
return strcmp(sym->name(), "___tls_get_addr") == 0;
}
{ return strcmp(sym->name(), "___tls_get_addr") == 0; }
// Return the PLT address to use for a global symbol.
uint64_t
@@ -441,6 +439,16 @@ class Target_sparc : public Sized_target<size, big_endian>
GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair
};
struct Register_symbol
{
Register_symbol()
: name(NULL), shndx(0), obj(NULL)
{ }
const char* name;
unsigned int shndx;
Object* obj;
};
// The GOT section.
Output_data_got<size, big_endian>* got_;
// The PLT section.
@@ -461,6 +469,8 @@ class Target_sparc : public Sized_target<size, big_endian>
elfcpp::Elf_Word elf_flags_;
// Whether elf_flags_ has been set for the first time yet
bool elf_flags_set_;
// STT_SPARC_REGISTER symbols (%g2, %g3, %g6, %g7).
Register_symbol register_syms_[4];
};
template<>
@@ -497,7 +507,7 @@ Target::Target_info Target_sparc<64, true>::sparc_info =
64, // size
true, // is_big_endian
elfcpp::EM_SPARCV9, // machine_code
false, // has_make_symbol
true, // has_make_symbol
false, // has_resolve
false, // has_code_fill
true, // is_default_stack_executable
@@ -3023,6 +3033,68 @@ Target_sparc<size, big_endian>::Scan::global(
}
}
// Make a new symbol table entry.
// STT_SPARC_REGISTER symbols require special handling,
// so we intercept these symbols and keep track of them separately.
// We will resolve register symbols here and output them at symbol
// finalization time.
template<int size, bool big_endian>
Sized_symbol<size>*
Target_sparc<size, big_endian>::make_symbol(const char* name,
elfcpp::STT type,
Object* object,
unsigned int shndx,
uint64_t value)
{
// REGISTER symbols are used only on SPARC-64.
if (size == 64 && type == elfcpp::STT_SPARC_REGISTER)
{
// Ignore REGISTER symbols in dynamic objects.
if (object->is_dynamic())
return NULL;
// Only registers 2, 3, 6, and 7 can be declared global.
int reg = value;
switch (reg)
{
case 2: case 3:
reg -= 2;
break;
case 6: case 7:
reg -= 4;
break;
default:
gold_error(_("%s: only registers %%g[2367] can be declared "
"using STT_REGISTER"),
object->name().c_str());
return NULL;
}
Register_symbol& rsym = this->register_syms_[reg];
if (rsym.name == NULL)
{
rsym.name = name;
rsym.shndx = shndx;
rsym.obj = object;
}
else
{
if (strcmp(rsym.name, name) != 0)
{
gold_error(_("%s: register %%g%d declared as '%s'; "
"previously declared as '%s' in %s"),
object->name().c_str(),
static_cast<int>(value),
*name ? name : "#scratch",
*rsym.name ? rsym.name : "#scratch",
rsym.obj->name().c_str());
return NULL;
}
}
return NULL;
}
return new Sized_symbol<size>();
}
// Process relocations for gc.
template<int size, bool big_endian>
@@ -3165,6 +3237,27 @@ Target_sparc<size, big_endian>::do_finalize_sections(
symtab->define_symbols(layout, 2, syms,
layout->script_options()->saw_sections_clause());
}
for (int reg = 0; reg < 4; ++reg)
{
Register_symbol& rsym = this->register_syms_[reg];
if (rsym.name != NULL)
{
int value = reg < 3 ? reg + 2 : reg + 4;
Sized_symbol<size>* sym = new Sized_symbol<size>();
if (rsym.shndx == elfcpp::SHN_UNDEF)
sym->init_undefined(rsym.name, NULL, value,
elfcpp::STT_SPARC_REGISTER, elfcpp::STB_GLOBAL,
elfcpp::STV_DEFAULT, 0);
else
sym->init_constant(rsym.name, NULL, value, 0,
elfcpp::STT_SPARC_REGISTER, elfcpp::STB_GLOBAL,
elfcpp::STV_DEFAULT, 0, false);
symtab->add_target_global_symbol(sym);
layout->add_target_specific_dynamic_tag(elfcpp::DT_SPARC_REGISTER,
value);
}
}
}
// Perform a relocation.