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authorCary Coutant <ccoutant@gmail.com>2016-02-04 16:55:39 -0800
committerCary Coutant <ccoutant@gmail.com>2016-03-03 18:19:53 -0800
commitdc1c8a16a38dec431c77f49cf50a9b62d6366138 (patch)
treedde11c01459658ee118c3eefe93f8343beb9d623 /gold/sparc.cc
parent8b4ee0a5c134be874ba44038d2fbd4d9b7f6d3ee (diff)
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Add support for STT_SPARC_REGISTER symbols.
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.
Diffstat (limited to 'gold/sparc.cc')
-rw-r--r--gold/sparc.cc111
1 files changed, 102 insertions, 9 deletions
diff --git a/gold/sparc.cc b/gold/sparc.cc
index c97c32c..10a5031 100644
--- a/gold/sparc.cc
+++ b/gold/sparc.cc
@@ -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.