// powerpc.cc -- powerpc target support for gold.
-// Copyright 2008, 2009 Free Software Foundation, Inc.
+// Copyright 2008, 2009, 2010 Free Software Foundation, Inc.
// Written by David S. Miller <davem@davemloft.net>
// and David Edelsohn <edelsohn@gnu.org>
#include "target-select.h"
#include "tls.h"
#include "errors.h"
+#include "gc.h"
namespace
{
// Process the relocations to determine unreferenced sections for
// garbage collection.
void
- gc_process_relocs(const General_options& options,
- Symbol_table* symtab,
+ gc_process_relocs(Symbol_table* symtab,
Layout* layout,
Sized_relobj<size, big_endian>* object,
unsigned int data_shndx,
// Scan the relocations to look for symbol adjustments.
void
- scan_relocs(const General_options& options,
- Symbol_table* symtab,
+ scan_relocs(Symbol_table* symtab,
Layout* layout,
Sized_relobj<size, big_endian>* object,
unsigned int data_shndx,
const unsigned char* plocal_symbols);
// Finalize the sections.
void
- do_finalize_sections(Layout*);
+ do_finalize_sections(Layout*, const Input_objects*, Symbol_table*);
// Return the value to use for a dynamic which requires special
// treatment.
bool needs_special_offset_handling,
unsigned char* view,
typename elfcpp::Elf_types<size>::Elf_Addr view_address,
- section_size_type view_size);
+ section_size_type view_size,
+ const Reloc_symbol_changes*);
// Scan the relocs during a relocatable link.
void
- scan_relocatable_relocs(const General_options& options,
- Symbol_table* symtab,
+ scan_relocatable_relocs(Symbol_table* symtab,
Layout* layout,
Sized_relobj<size, big_endian>* object,
unsigned int data_shndx,
// Return the size of the GOT section.
section_size_type
- got_size()
+ got_size() const
{
gold_assert(this->got_ != NULL);
return this->got_->data_size();
}
+ // Return the number of entries in the GOT.
+ unsigned int
+ got_entry_count() const
+ {
+ if (this->got_ == NULL)
+ return 0;
+ return this->got_size() / (size / 8);
+ }
+
+ // Return the number of entries in the PLT.
+ unsigned int
+ plt_entry_count() const;
+
+ // Return the offset of the first non-reserved PLT entry.
+ unsigned int
+ first_plt_entry_offset() const;
+
+ // Return the size of each PLT entry.
+ unsigned int
+ plt_entry_size() const;
+
private:
// The class which scans relocations.
{ }
inline void
- local(const General_options& options, Symbol_table* symtab,
- Layout* layout, Target_powerpc* target,
+ local(Symbol_table* symtab, Layout* layout, Target_powerpc* target,
Sized_relobj<size, big_endian>* object,
unsigned int data_shndx,
Output_section* output_section,
const elfcpp::Sym<size, big_endian>& lsym);
inline void
- global(const General_options& options, Symbol_table* symtab,
- Layout* layout, Target_powerpc* target,
+ global(Symbol_table* symtab, Layout* layout, Target_powerpc* target,
Sized_relobj<size, big_endian>* object,
unsigned int data_shndx,
Output_section* output_section,
const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type,
Symbol* gsym);
+ inline bool
+ local_reloc_may_be_function_pointer(Symbol_table* , Layout* ,
+ Target_powerpc* ,
+ Sized_relobj<size, big_endian>* ,
+ unsigned int ,
+ Output_section* ,
+ const elfcpp::Rela<size, big_endian>& ,
+ unsigned int ,
+ const elfcpp::Sym<size, big_endian>&)
+ { return false; }
+
+ inline bool
+ global_reloc_may_be_function_pointer(Symbol_table* , Layout* ,
+ Target_powerpc* ,
+ Sized_relobj<size, big_endian>* ,
+ unsigned int ,
+ Output_section* ,
+ const elfcpp::Rela<size,
+ big_endian>& ,
+ unsigned int , Symbol*)
+ { return false; }
+
private:
static void
unsupported_reloc_local(Sized_relobj<size, big_endian>*,
Output_data_space*
got2_section() const
{
- gold_assert (this->got2_ != NULL);
+ gold_assert(this->got2_ != NULL);
return this->got2_;
}
Output_data_space*
toc_section() const
{
- gold_assert (this->toc_ != NULL);
+ gold_assert(this->toc_ != NULL);
return this->toc_;
}
static Target::Target_info powerpc_info;
// The types of GOT entries needed for this platform.
+ // These values are exposed to the ABI in an incremental link.
+ // Do not renumber existing values without changing the version
+ // number of the .gnu_incremental_inputs section.
enum Got_type
{
GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol
elfcpp::SHN_UNDEF, // small_common_shndx
elfcpp::SHN_UNDEF, // large_common_shndx
0, // small_common_section_flags
- 0 // large_common_section_flags
+ 0, // large_common_section_flags
+ NULL, // attributes_section
+ NULL // attributes_vendor
};
template<>
elfcpp::SHN_UNDEF, // small_common_shndx
elfcpp::SHN_UNDEF, // large_common_shndx
0, // small_common_section_flags
- 0 // large_common_section_flags
+ 0, // large_common_section_flags
+ NULL, // attributes_section
+ NULL // attributes_vendor
};
template<>
elfcpp::SHN_UNDEF, // small_common_shndx
elfcpp::SHN_UNDEF, // large_common_shndx
0, // small_common_section_flags
- 0 // large_common_section_flags
+ 0, // large_common_section_flags
+ NULL, // attributes_section
+ NULL // attributes_vendor
};
template<>
elfcpp::SHN_UNDEF, // small_common_shndx
elfcpp::SHN_UNDEF, // large_common_shndx
0, // small_common_section_flags
- 0 // large_common_section_flags
+ 0, // large_common_section_flags
+ NULL, // attributes_section
+ NULL // attributes_vendor
};
template<int size, bool big_endian>
layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
- this->got_);
+ this->got_, ORDER_DATA, false);
// Create the GOT2 or TOC in the .got section.
if (size == 32)
layout->add_output_section_data(".got2", elfcpp::SHT_PROGBITS,
elfcpp::SHF_ALLOC
| elfcpp::SHF_WRITE,
- this->got2_);
+ this->got2_, ORDER_DATA, false);
}
else
{
layout->add_output_section_data(".toc", elfcpp::SHT_PROGBITS,
elfcpp::SHF_ALLOC
| elfcpp::SHF_WRITE,
- this->toc_);
+ this->toc_, ORDER_DATA, false);
}
// Define _GLOBAL_OFFSET_TABLE_ at the start of the .got section.
symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
+ Symbol_table::PREDEFINED,
this->got_,
0, 0, elfcpp::STT_OBJECT,
elfcpp::STB_LOCAL,
gold_assert(layout != NULL);
this->rela_dyn_ = new Reloc_section(parameters->options().combreloc());
layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
- elfcpp::SHF_ALLOC, this->rela_dyn_);
+ elfcpp::SHF_ALLOC, this->rela_dyn_,
+ ORDER_DYNAMIC_RELOCS, false);
}
return this->rela_dyn_;
}
return this->rel_;
}
+ // Return the number of PLT entries.
+ unsigned int
+ entry_count() const
+ { return this->count_; }
+
+ // Return the offset of the first non-reserved PLT entry.
+ static unsigned int
+ first_plt_entry_offset()
+ { return 4 * base_plt_entry_size; }
+
+ // Return the size of a PLT entry.
+ static unsigned int
+ get_plt_entry_size()
+ { return base_plt_entry_size; }
+
protected:
void do_adjust_output_section(Output_section* os);
{
this->rel_ = new Reloc_section(false);
layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
- elfcpp::SHF_ALLOC, this->rel_);
+ elfcpp::SHF_ALLOC, this->rel_,
+ ORDER_DYNAMIC_PLT_RELOCS, false);
}
template<int size, bool big_endian>
// Create the GOT section first.
this->got_section(symtab, layout);
+ // Ensure that .rela.dyn always appears before .rela.plt This is
+ // necessary due to how, on PowerPC and some other targets, .rela.dyn
+ // needs to include .rela.plt in it's range.
+ this->rela_dyn_section(layout);
+
this->plt_ = new Output_data_plt_powerpc<size, big_endian>(layout);
layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
(elfcpp::SHF_ALLOC
| elfcpp::SHF_EXECINSTR
| elfcpp::SHF_WRITE),
- this->plt_);
+ this->plt_, ORDER_PLT, false);
// Define _PROCEDURE_LINKAGE_TABLE_ at the start of the .plt section.
symtab->define_in_output_data("_PROCEDURE_LINKAGE_TABLE_", NULL,
+ Symbol_table::PREDEFINED,
this->plt_,
0, 0, elfcpp::STT_OBJECT,
elfcpp::STB_LOCAL,
this->plt_->add_entry(gsym);
}
+// Return the number of entries in the PLT.
+
+template<int size, bool big_endian>
+unsigned int
+Target_powerpc<size, big_endian>::plt_entry_count() const
+{
+ if (this->plt_ == NULL)
+ return 0;
+ return this->plt_->entry_count();
+}
+
+// Return the offset of the first non-reserved PLT entry.
+
+template<int size, bool big_endian>
+unsigned int
+Target_powerpc<size, big_endian>::first_plt_entry_offset() const
+{
+ return Output_data_plt_powerpc<size, big_endian>::first_plt_entry_offset();
+}
+
+// Return the size of each PLT entry.
+
+template<int size, bool big_endian>
+unsigned int
+Target_powerpc<size, big_endian>::plt_entry_size() const
+{
+ return Output_data_plt_powerpc<size, big_endian>::get_plt_entry_size();
+}
+
// Create a GOT entry for the TLS module index.
template<int size, bool big_endian>
template<int size, bool big_endian>
inline void
Target_powerpc<size, big_endian>::Scan::local(
- const General_options&,
Symbol_table* symtab,
Layout* layout,
Target_powerpc<size, big_endian>* target,
template<int size, bool big_endian>
inline void
Target_powerpc<size, big_endian>::Scan::global(
- const General_options&,
Symbol_table* symtab,
Layout* layout,
Target_powerpc<size, big_endian>* target,
template<int size, bool big_endian>
void
Target_powerpc<size, big_endian>::gc_process_relocs(
- const General_options& options,
Symbol_table* symtab,
Layout* layout,
Sized_relobj<size, big_endian>* object,
typedef Target_powerpc<size, big_endian> Powerpc;
typedef typename Target_powerpc<size, big_endian>::Scan Scan;
- gold::gc_process_relocs<size, big_endian, Powerpc, elfcpp::SHT_RELA, Scan>(
- options,
+ gold::gc_process_relocs<size, big_endian, Powerpc, elfcpp::SHT_RELA, Scan,
+ typename Target_powerpc::Relocatable_size_for_reloc>(
symtab,
layout,
this,
template<int size, bool big_endian>
void
Target_powerpc<size, big_endian>::scan_relocs(
- const General_options& options,
Symbol_table* symtab,
Layout* layout,
Sized_relobj<size, big_endian>* object,
Output_section* os = layout->add_output_section_data(".sdata", 0,
elfcpp::SHF_ALLOC
| elfcpp::SHF_WRITE,
- sdata);
+ sdata,
+ ORDER_SMALL_DATA,
+ false);
symtab->define_in_output_data("_SDA_BASE_", NULL,
+ Symbol_table::PREDEFINED,
os,
32768, 0,
elfcpp::STT_OBJECT,
}
gold::scan_relocs<size, big_endian, Powerpc, elfcpp::SHT_RELA, Scan>(
- options,
symtab,
layout,
this,
template<int size, bool big_endian>
void
-Target_powerpc<size, big_endian>::do_finalize_sections(Layout* layout)
+Target_powerpc<size, big_endian>::do_finalize_sections(
+ Layout* layout,
+ const Input_objects*,
+ Symbol_table*)
{
// Fill in some more dynamic tags.
- Output_data_dynamic* const odyn = layout->dynamic_data();
- if (odyn != NULL)
- {
- if (this->plt_ != NULL)
- {
- const Output_data* od = this->plt_->rel_plt();
- odyn->add_section_size(elfcpp::DT_PLTRELSZ, od);
- odyn->add_section_address(elfcpp::DT_JMPREL, od);
- odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_RELA);
-
- odyn->add_section_address(elfcpp::DT_PLTGOT, this->plt_);
- }
-
- if (this->rela_dyn_ != NULL)
- {
- const Output_data* od = this->rela_dyn_;
- odyn->add_section_address(elfcpp::DT_RELA, od);
- odyn->add_section_size(elfcpp::DT_RELASZ, od);
- odyn->add_constant(elfcpp::DT_RELAENT,
- elfcpp::Elf_sizes<size>::rela_size);
- }
-
- if (!parameters->options().shared())
- {
- // The value of the DT_DEBUG tag is filled in by the dynamic
- // linker at run time, and used by the debugger.
- odyn->add_constant(elfcpp::DT_DEBUG, 0);
- }
- }
+ const Reloc_section* rel_plt = (this->plt_ == NULL
+ ? NULL
+ : this->plt_->rel_plt());
+ layout->add_target_dynamic_tags(false, this->plt_, rel_plt,
+ this->rela_dyn_, true, size == 32);
// Emit any relocs we saved in an attempt to avoid generating COPY
// relocs.
// Get the GOT offset if needed. Unlike i386 and x86_64, our GOT
// pointer points to the beginning, not the end, of the table.
// So we just use the plain offset.
- bool have_got_offset = false;
unsigned int got_offset = 0;
unsigned int got2_offset = 0;
switch (r_type)
gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD));
got_offset = object->local_got_offset(r_sym, GOT_TYPE_STANDARD);
}
- have_got_offset = true;
break;
// R_PPC_PLTREL24 is rather special. If non-zero,
got2_offset = got2->offset();
addend += got2_offset;
}
- have_got_offset = true;
break;
default:
bool needs_special_offset_handling,
unsigned char* view,
typename elfcpp::Elf_types<size>::Elf_Addr address,
- section_size_type view_size)
+ section_size_type view_size,
+ const Reloc_symbol_changes* reloc_symbol_changes)
{
typedef Target_powerpc<size, big_endian> Powerpc;
typedef typename Target_powerpc<size, big_endian>::Relocate Powerpc_relocate;
needs_special_offset_handling,
view,
address,
- view_size);
+ view_size,
+ reloc_symbol_changes);
}
// Return the size of a relocation while scanning during a relocatable
template<int size, bool big_endian>
void
Target_powerpc<size, big_endian>::scan_relocatable_relocs(
- const General_options& options,
Symbol_table* symtab,
Layout* layout,
Sized_relobj<size, big_endian>* object,
gold::scan_relocatable_relocs<size, big_endian, elfcpp::SHT_RELA,
Scan_relocatable_relocs>(
- options,
symtab,
layout,
object,
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