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old-cross-binutils/gold/powerpc.cc
Alan Modra cf43a2fe99 * object.h (Sized_relobj_file::find_shdr): New function. 
(Sized_relobj_file::find_special_sections): New function.
	* object.cc (Sized_relobj_file::find_shdr): New function.
	(Sized_relobj_file::find_eh_frame): Use find_shdr.
	(Sized_relobj_file::find_special_sections): New function, split out..
	(Sized_relobj_file::do_read_symbols): ..from here.
	* output.h (Output_data_got::replace_constant): New function.
	(Output_data_got::num_entries): New function.
	(Output_data_got::last_got_offset,set_got_size): Use num_entries.
	(Output_data_got::got_offset): Protected rather than private.
	(Output_data_got::replace_got_entry): New function.
	* output.cc (Output_data_got::replace_got_entry): New function.
	* powerpc.cc (class Powerpc_relobj): New.
	(class Powerpc_relocate_functions): Delete all psymval variants or
	convert to value,addend type.  Delete pcrela, pcrela_unaligned.
	Implement _ha functions using corresponding _hi function.
	(Powerpc_relobj::find_special_sections): New function.
	(Target_powerpc::do_make_elf_object): New function.
	(class Output_data_got_powerpc): New.
	(class Output_data_glink): New.
	(class Powerpc_scan_relocatable_reloc): New.
	Many more changes througout file.
2012-08-11 04:41:28 +00:00

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// powerpc.cc -- powerpc target support for gold.
// Copyright 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
// Written by David S. Miller <davem@davemloft.net>
// and David Edelsohn <edelsohn@gnu.org>
// This file is part of gold.
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
// MA 02110-1301, USA.
#include "gold.h"
#include "elfcpp.h"
#include "parameters.h"
#include "reloc.h"
#include "powerpc.h"
#include "object.h"
#include "symtab.h"
#include "layout.h"
#include "output.h"
#include "copy-relocs.h"
#include "target.h"
#include "target-reloc.h"
#include "target-select.h"
#include "tls.h"
#include "errors.h"
#include "gc.h"
namespace
{
using namespace gold;
template<int size, bool big_endian>
class Output_data_plt_powerpc;
template<int size, bool big_endian>
class Output_data_got_powerpc;
template<int size, bool big_endian>
class Output_data_glink;
template<int size, bool big_endian>
class Powerpc_relobj : public Sized_relobj_file<size, big_endian>
{
public:
Powerpc_relobj(const std::string& name, Input_file* input_file, off_t offset,
const typename elfcpp::Ehdr<size, big_endian>& ehdr)
: Sized_relobj_file<size, big_endian>(name, input_file, offset, ehdr),
got2_section_(0)
{ }
~Powerpc_relobj()
{ }
unsigned int
got2_shndx() const
{
if (size == 32)
return this->got2_section_;
else
return 0;
}
void
set_got2_shndx(unsigned int shndx)
{
if (size == 32)
this->got2_section_ = shndx;
else
gold_unreachable();
}
bool
do_find_special_sections(Read_symbols_data* sd);
private:
unsigned int got2_section_;
};
template<int size, bool big_endian>
class Target_powerpc : public Sized_target<size, big_endian>
{
public:
typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> Reloc_section;
Target_powerpc()
: Sized_target<size, big_endian>(&powerpc_info),
got_(NULL), plt_(NULL), glink_(NULL), rela_dyn_(NULL),
copy_relocs_(elfcpp::R_POWERPC_COPY),
dynbss_(NULL), got_mod_index_offset_(-1U)
{
}
// Process the relocations to determine unreferenced sections for
// garbage collection.
void
gc_process_relocs(Symbol_table* symtab,
Layout* layout,
Sized_relobj_file<size, big_endian>* object,
unsigned int data_shndx,
unsigned int sh_type,
const unsigned char* prelocs,
size_t reloc_count,
Output_section* output_section,
bool needs_special_offset_handling,
size_t local_symbol_count,
const unsigned char* plocal_symbols);
// Scan the relocations to look for symbol adjustments.
void
scan_relocs(Symbol_table* symtab,
Layout* layout,
Sized_relobj_file<size, big_endian>* object,
unsigned int data_shndx,
unsigned int sh_type,
const unsigned char* prelocs,
size_t reloc_count,
Output_section* output_section,
bool needs_special_offset_handling,
size_t local_symbol_count,
const unsigned char* plocal_symbols);
// Finalize the sections.
void
do_finalize_sections(Layout*, const Input_objects*, Symbol_table*);
// 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<size, big_endian>*,
unsigned int sh_type,
const unsigned char* prelocs,
size_t reloc_count,
Output_section* output_section,
bool needs_special_offset_handling,
unsigned char* view,
typename elfcpp::Elf_types<size>::Elf_Addr view_address,
section_size_type view_size,
const Reloc_symbol_changes*);
// Scan the relocs during a relocatable link.
void
scan_relocatable_relocs(Symbol_table* symtab,
Layout* layout,
Sized_relobj_file<size, big_endian>* object,
unsigned int data_shndx,
unsigned int sh_type,
const unsigned char* prelocs,
size_t reloc_count,
Output_section* output_section,
bool needs_special_offset_handling,
size_t local_symbol_count,
const unsigned char* plocal_symbols,
Relocatable_relocs*);
// Relocate a section during a relocatable link.
void
relocate_for_relocatable(const Relocate_info<size, big_endian>*,
unsigned int sh_type,
const unsigned char* prelocs,
size_t reloc_count,
Output_section* output_section,
off_t offset_in_output_section,
const Relocatable_relocs*,
unsigned char*,
typename elfcpp::Elf_types<size>::Elf_Addr,
section_size_type,
unsigned char* reloc_view,
section_size_type reloc_view_size);
// Return whether SYM is defined by the ABI.
bool
do_is_defined_by_abi(const Symbol* sym) const
{
return strcmp(sym->name(), "__tls_get_addr") == 0;
}
// Return the size of the GOT section.
section_size_type
got_size() const
{
gold_assert(this->got_ != NULL);
return this->got_->data_size();
}
// Get the PLT section.
const Output_data_plt_powerpc<size, big_endian>*
plt_section() const
{
gold_assert(this->plt_ != NULL);
return this->plt_;
}
// Get the .glink section.
const Output_data_glink<size, big_endian>*
glink_section() const
{
gold_assert(this->glink_ != NULL);
return this->glink_;
}
// Get the GOT section.
const Output_data_got_powerpc<size, big_endian>*
got_section() const
{
gold_assert(this->got_ != NULL);
return this->got_;
}
protected:
Object*
do_make_elf_object(const std::string&, Input_file*, off_t,
const elfcpp::Ehdr<size, big_endian>&);
// 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.
class Scan
{
public:
Scan()
: issued_non_pic_error_(false)
{ }
static inline int
get_reference_flags(unsigned int r_type);
inline void
local(Symbol_table* symtab, Layout* layout, Target_powerpc* target,
Sized_relobj_file<size, big_endian>* object,
unsigned int data_shndx,
Output_section* output_section,
const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type,
const elfcpp::Sym<size, big_endian>& lsym);
inline void
global(Symbol_table* symtab, Layout* layout, Target_powerpc* target,
Sized_relobj_file<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_file<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_file<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_file<size, big_endian>*,
unsigned int r_type);
static void
unsupported_reloc_global(Sized_relobj_file<size, big_endian>*,
unsigned int r_type, Symbol*);
static void
generate_tls_call(Symbol_table* symtab, Layout* layout,
Target_powerpc* target);
void
check_non_pic(Relobj*, unsigned int r_type);
// Whether we have issued an error about a non-PIC compilation.
bool issued_non_pic_error_;
};
// The class which implements relocation.
class Relocate
{
public:
// Do a relocation. Return false if the caller should not issue
// any warnings about this relocation.
inline bool
relocate(const Relocate_info<size, big_endian>*, Target_powerpc*,
Output_section*, size_t relnum,
const elfcpp::Rela<size, big_endian>&,
unsigned int r_type, const Sized_symbol<size>*,
const Symbol_value<size>*,
unsigned char*,
typename elfcpp::Elf_types<size>::Elf_Addr,
section_size_type);
private:
// Do a TLS relocation.
inline void
relocate_tls(const Relocate_info<size, big_endian>*,
Target_powerpc* target,
size_t relnum, const elfcpp::Rela<size, big_endian>&,
unsigned int r_type, const Sized_symbol<size>*,
const Symbol_value<size>*,
unsigned char*,
typename elfcpp::Elf_types<size>::Elf_Addr,
section_size_type);
};
// A class which returns the size required for a relocation type,
// used while scanning relocs during a relocatable link.
class Relocatable_size_for_reloc
{
public:
unsigned int
get_size_for_reloc(unsigned int, Relobj*)
{
gold_unreachable();
return 0;
}
};
// Adjust TLS relocation type based on the options and whether this
// is a local symbol.
static tls::Tls_optimization
optimize_tls_reloc(bool is_final, int r_type);
// Get the GOT section, creating it if necessary.
Output_data_got_powerpc<size, big_endian>*
got_section(Symbol_table*, Layout*);
// Create glink.
void
make_glink_section(Layout*);
// Create the PLT section.
void
make_plt_section(Layout*);
// Create a PLT entry for a global symbol.
void
make_plt_entry(Layout*, Symbol*,
const elfcpp::Rela<size, big_endian>&,
const Sized_relobj<size, big_endian>* object);
// Create a GOT entry for the TLS module index.
unsigned int
got_mod_index_entry(Symbol_table* symtab, Layout* layout,
Sized_relobj_file<size, big_endian>* object);
// Get the dynamic reloc section, creating it if necessary.
Reloc_section*
rela_dyn_section(Layout*);
// Copy a relocation against a global symbol.
void
copy_reloc(Symbol_table* symtab, Layout* layout,
Sized_relobj_file<size, big_endian>* object,
unsigned int shndx, Output_section* output_section,
Symbol* sym, const elfcpp::Rela<size, big_endian>& reloc)
{
this->copy_relocs_.copy_reloc(symtab, layout,
symtab->get_sized_symbol<size>(sym),
object, shndx, output_section,
reloc, this->rela_dyn_section(layout));
}
// Information about this specific target which we pass to the
// general Target structure.
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
GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset
GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair
};
// The GOT output section.
Output_data_got_powerpc<size, big_endian>* got_;
// The PLT output section.
Output_data_plt_powerpc<size, big_endian>* plt_;
// The .glink output section.
Output_data_glink<size, big_endian>* glink_;
// The dynamic reloc output section.
Reloc_section* rela_dyn_;
// Relocs saved to avoid a COPY reloc.
Copy_relocs<elfcpp::SHT_RELA, size, big_endian> copy_relocs_;
// Space for variables copied with a COPY reloc.
Output_data_space* dynbss_;
// Offset of the GOT entry for the TLS module index;
unsigned int got_mod_index_offset_;
};
template<>
Target::Target_info Target_powerpc<32, true>::powerpc_info =
{
32, // size
true, // is_big_endian
elfcpp::EM_PPC, // machine_code
false, // has_make_symbol
false, // has_resolve
false, // has_code_fill
true, // is_default_stack_executable
false, // can_icf_inline_merge_sections
'\0', // wrap_char
"/usr/lib/ld.so.1", // dynamic_linker
0x10000000, // default_text_segment_address
64 * 1024, // abi_pagesize (overridable by -z max-page-size)
4 * 1024, // common_pagesize (overridable by -z common-page-size)
false, // isolate_execinstr
0, // rosegment_gap
elfcpp::SHN_UNDEF, // small_common_shndx
elfcpp::SHN_UNDEF, // large_common_shndx
0, // small_common_section_flags
0, // large_common_section_flags
NULL, // attributes_section
NULL // attributes_vendor
};
template<>
Target::Target_info Target_powerpc<32, false>::powerpc_info =
{
32, // size
false, // is_big_endian
elfcpp::EM_PPC, // machine_code
false, // has_make_symbol
false, // has_resolve
false, // has_code_fill
true, // is_default_stack_executable
false, // can_icf_inline_merge_sections
'\0', // wrap_char
"/usr/lib/ld.so.1", // dynamic_linker
0x10000000, // default_text_segment_address
64 * 1024, // abi_pagesize (overridable by -z max-page-size)
4 * 1024, // common_pagesize (overridable by -z common-page-size)
false, // isolate_execinstr
0, // rosegment_gap
elfcpp::SHN_UNDEF, // small_common_shndx
elfcpp::SHN_UNDEF, // large_common_shndx
0, // small_common_section_flags
0, // large_common_section_flags
NULL, // attributes_section
NULL // attributes_vendor
};
template<>
Target::Target_info Target_powerpc<64, true>::powerpc_info =
{
64, // size
true, // is_big_endian
elfcpp::EM_PPC64, // machine_code
false, // has_make_symbol
false, // has_resolve
false, // has_code_fill
true, // is_default_stack_executable
false, // can_icf_inline_merge_sections
'\0', // wrap_char
"/usr/lib/ld.so.1", // dynamic_linker
0x10000000, // default_text_segment_address
64 * 1024, // abi_pagesize (overridable by -z max-page-size)
8 * 1024, // common_pagesize (overridable by -z common-page-size)
false, // isolate_execinstr
0, // rosegment_gap
elfcpp::SHN_UNDEF, // small_common_shndx
elfcpp::SHN_UNDEF, // large_common_shndx
0, // small_common_section_flags
0, // large_common_section_flags
NULL, // attributes_section
NULL // attributes_vendor
};
template<>
Target::Target_info Target_powerpc<64, false>::powerpc_info =
{
64, // size
false, // is_big_endian
elfcpp::EM_PPC64, // machine_code
false, // has_make_symbol
false, // has_resolve
false, // has_code_fill
true, // is_default_stack_executable
false, // can_icf_inline_merge_sections
'\0', // wrap_char
"/usr/lib/ld.so.1", // dynamic_linker
0x10000000, // default_text_segment_address
64 * 1024, // abi_pagesize (overridable by -z max-page-size)
8 * 1024, // common_pagesize (overridable by -z common-page-size)
false, // isolate_execinstr
0, // rosegment_gap
elfcpp::SHN_UNDEF, // small_common_shndx
elfcpp::SHN_UNDEF, // large_common_shndx
0, // small_common_section_flags
0, // large_common_section_flags
NULL, // attributes_section
NULL // attributes_vendor
};
template<int size, bool big_endian>
class Powerpc_relocate_functions
{
private:
// Do a simple RELA relocation
template<int valsize>
static inline void
rela(unsigned char* view,
unsigned int right_shift,
elfcpp::Elf_Xword dst_mask,
typename elfcpp::Swap<size, big_endian>::Valtype value,
typename elfcpp::Swap<size, big_endian>::Valtype addend)
{
typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
Valtype* wv = reinterpret_cast<Valtype*>(view);
Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv);
Valtype reloc = (value + addend) >> right_shift;
val &= ~dst_mask;
reloc &= dst_mask;
elfcpp::Swap<valsize, big_endian>::writeval(wv, val | reloc);
}
// Do a simple RELA relocation, unaligned.
template<int valsize>
static inline void
rela_ua(unsigned char* view,
unsigned int right_shift,
elfcpp::Elf_Xword dst_mask,
typename elfcpp::Swap<size, big_endian>::Valtype value,
typename elfcpp::Swap<size, big_endian>::Valtype addend)
{
typedef typename elfcpp::Swap_unaligned<valsize,
big_endian>::Valtype Valtype;
Valtype* wv = reinterpret_cast<Valtype*>(view);
Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv);
Valtype reloc = (value + addend) >> right_shift;
val &= ~dst_mask;
reloc &= dst_mask;
elfcpp::Swap_unaligned<valsize, big_endian>::writeval(wv, val | reloc);
}
typedef Powerpc_relocate_functions<size, big_endian> This;
typedef Relocate_functions<size, big_endian> This_reloc;
public:
// R_POWERPC_REL32: (Symbol + Addend - Address)
static inline void
rel32(unsigned char* view,
typename elfcpp::Elf_types<size>::Elf_Addr value,
typename elfcpp::Elf_types<size>::Elf_Addr addend,
typename elfcpp::Elf_types<size>::Elf_Addr address)
{ This_reloc::pcrela32(view, value, addend, address); }
// R_POWERPC_REL24: (Symbol + Addend - Address) & 0x3fffffc
static inline void
rel24(unsigned char* view,
typename elfcpp::Elf_types<size>::Elf_Addr value,
typename elfcpp::Elf_types<size>::Elf_Addr addend,
typename elfcpp::Elf_types<size>::Elf_Addr address)
{
This::template rela<32>(view, 0, 0x03fffffc, value - address, addend);
}
// R_POWERPC_REL14: (Symbol + Addend - Address) & 0xfffc
static inline void
rel14(unsigned char* view,
typename elfcpp::Elf_types<size>::Elf_Addr value,
typename elfcpp::Elf_types<size>::Elf_Addr addend,
typename elfcpp::Elf_types<size>::Elf_Addr address)
{
This::template rela<32>(view, 0, 0xfffc, value - address, addend);
}
// R_POWERPC_ADDR16: (Symbol + Addend) & 0xffff
static inline void
addr16(unsigned char* view,
typename elfcpp::Elf_types<size>::Elf_Addr value,
typename elfcpp::Elf_types<size>::Elf_Addr addend)
{ This_reloc::rela16(view, value, addend); }
// R_POWERPC_ADDR16_DS: (Symbol + Addend) & 0xfffc
static inline void
addr16_ds(unsigned char* view,
typename elfcpp::Elf_types<size>::Elf_Addr value,
typename elfcpp::Elf_types<size>::Elf_Addr addend)
{
This::template rela<16>(view, 0, 0xfffc, value, addend);
}
// R_POWERPC_ADDR16_LO: (Symbol + Addend) & 0xffff
static inline void
addr16_lo(unsigned char* view,
typename elfcpp::Elf_types<size>::Elf_Addr value,
typename elfcpp::Elf_types<size>::Elf_Addr addend)
{ This_reloc::rela16(view, value, addend); }
// R_POWERPC_ADDR16_HI: ((Symbol + Addend) >> 16) & 0xffff
static inline void
addr16_hi(unsigned char* view,
typename elfcpp::Elf_types<size>::Elf_Addr value,
typename elfcpp::Elf_types<size>::Elf_Addr addend)
{
This::template rela<16>(view, 16, 0xffff, value, addend);
}
// R_POWERPC_ADDR16_HA: Same as R_POWERPC_ADDR16_HI except that if the
// final value of the low 16 bits of the
// relocation is negative, add one.
static inline void
addr16_ha(unsigned char* view,
typename elfcpp::Elf_types<size>::Elf_Addr value,
typename elfcpp::Elf_types<size>::Elf_Addr addend)
{
This::addr16_hi(view, value + 0x8000, addend);
}
// R_PPC_REL16: (Symbol + Addend - Address) & 0xffff
static inline void
rel16(unsigned char* view,
typename elfcpp::Elf_types<size>::Elf_Addr value,
typename elfcpp::Elf_types<size>::Elf_Addr addend,
typename elfcpp::Elf_types<size>::Elf_Addr address)
{ This_reloc::pcrela16(view, value, addend, address); }
// R_PPC_REL16_LO: (Symbol + Addend - Address) & 0xffff
static inline void
rel16_lo(unsigned char* view,
typename elfcpp::Elf_types<size>::Elf_Addr value,
typename elfcpp::Elf_types<size>::Elf_Addr addend,
typename elfcpp::Elf_types<size>::Elf_Addr address)
{ This_reloc::pcrela16(view, value, addend, address); }
// R_PPC_REL16_HI: ((Symbol + Addend - Address) >> 16) & 0xffff
static inline void
rel16_hi(unsigned char* view,
typename elfcpp::Elf_types<size>::Elf_Addr value,
typename elfcpp::Elf_types<size>::Elf_Addr addend,
typename elfcpp::Elf_types<size>::Elf_Addr address)
{
This::template rela<16>(view, 16, 0xffff, value - address, addend);
}
// R_PPC_REL16_HA: Same as R_PPC_REL16_HI except that if the
// final value of the low 16 bits of the
// relocation is negative, add one.
static inline void
rel16_ha(unsigned char* view,
typename elfcpp::Elf_types<size>::Elf_Addr value,
typename elfcpp::Elf_types<size>::Elf_Addr addend,
typename elfcpp::Elf_types<size>::Elf_Addr address)
{
This::rel16_hi(view, value + 0x8000, addend, address);
}
};
// Stash away the index of .got2 in a relocatable object, if such
// a section exists.
template<int size, bool big_endian>
bool
Powerpc_relobj<size, big_endian>::do_find_special_sections(
Read_symbols_data* sd)
{
if (size == 32)
{
const unsigned char* const pshdrs = sd->section_headers->data();
const unsigned char* namesu = sd->section_names->data();
const char* names = reinterpret_cast<const char*>(namesu);
section_size_type names_size = sd->section_names_size;
const unsigned char* s;
s = this->find_shdr(pshdrs, ".got2", names, names_size, NULL);
if (s != NULL)
{
unsigned int ndx = (s - pshdrs) / elfcpp::Elf_sizes<size>::shdr_size;
this->set_got2_shndx(ndx);
}
}
return Sized_relobj_file<size, big_endian>::do_find_special_sections(sd);
}
// Set up PowerPC target specific relobj.
template<int size, bool big_endian>
Object*
Target_powerpc<size, big_endian>::do_make_elf_object(
const std::string& name,
Input_file* input_file,
off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr)
{
int et = ehdr.get_e_type();
if (et == elfcpp::ET_REL)
{
Powerpc_relobj<size, big_endian>* obj =
new Powerpc_relobj<size, big_endian>(name, input_file, offset, ehdr);
obj->setup();
return obj;
}
else if (et == elfcpp::ET_DYN)
{
Sized_dynobj<size, big_endian>* obj =
new Sized_dynobj<size, big_endian>(name, input_file, offset, ehdr);
obj->setup();
return obj;
}
else
{
gold_error(_("%s: unsupported ELF file type %d"),
name.c_str(), et);
return NULL;
}
}
template<int size, bool big_endian>
class Output_data_got_powerpc : public Output_data_got<size, big_endian>
{
public:
typedef typename elfcpp::Elf_types<size>::Elf_Addr Valtype;
typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> Rela_dyn;
Output_data_got_powerpc(Symbol_table* symtab, Layout* layout)
: Output_data_got<size, big_endian>(),
symtab_(symtab), layout_(layout),
header_ent_cnt_(size == 32 ? 3 : 1),
header_index_(size == 32 ? 0x2000 : 0)
{}
class Got_entry;
// Create a new GOT entry and return its offset.
unsigned int
add_got_entry(Got_entry got_entry)
{
this->reserve_ent();
return Output_data_got<size, big_endian>::add_got_entry(got_entry);
}
// Create a pair of new GOT entries and return the offset of the first.
unsigned int
add_got_entry_pair(Got_entry got_entry_1, Got_entry got_entry_2)
{
this->reserve_ent(2);
return Output_data_got<size, big_endian>::add_got_entry_pair(got_entry_1,
got_entry_2);
}
// Value of _GLOBAL_OFFSET_TABLE_
unsigned int
g_o_t() const
{
return this->got_offset(this->header_index_);
}
// Ensure our GOT has a header.
void
set_final_data_size()
{
if (this->header_ent_cnt_ != 0)
this->make_header();
Output_data_got<size, big_endian>::set_final_data_size();
}
// First word of GOT header needs some values that are not
// handled by Output_data_got so poke them in here.
// For 32-bit, address of .dynamic, for 64-bit, address of TOCbase.
void
do_write(Output_file* of)
{
replace_constant(this->header_index_,
(size == 32
? this->layout_->dynamic_section()->address()
: this->address() + 0x8000));
Output_data_got<size, big_endian>::do_write(of);
}
private:
void
reserve_ent(unsigned int cnt = 1)
{
if (this->header_ent_cnt_ == 0)
return;
if (this->num_entries() + cnt > this->header_index_)
this->make_header();
}
void
make_header()
{
this->header_ent_cnt_ = 0;
this->header_index_ = this->num_entries();
if (size == 32)
{
Output_data_got<size, big_endian>::add_constant(0);
Output_data_got<size, big_endian>::add_constant(0);
Output_data_got<size, big_endian>::add_constant(0);
// Define _GLOBAL_OFFSET_TABLE_ at the header
this->symtab_->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
Symbol_table::PREDEFINED,
this, this->g_o_t(), 0,
elfcpp::STT_OBJECT,
elfcpp::STB_LOCAL,
elfcpp::STV_HIDDEN,
0, false, false);
}
else
Output_data_got<size, big_endian>::add_constant(0);
}
// Stashed pointers.
Symbol_table* symtab_;
Layout* layout_;
// GOT header size.
unsigned int header_ent_cnt_;
// GOT header index.
unsigned int header_index_;
};
// Get the GOT section, creating it if necessary.
template<int size, bool big_endian>
Output_data_got_powerpc<size, big_endian>*
Target_powerpc<size, big_endian>::got_section(Symbol_table* symtab,
Layout* layout)
{
if (this->got_ == NULL)
{
gold_assert(symtab != NULL && layout != NULL);
this->got_
= new Output_data_got_powerpc<size, big_endian>(symtab, layout);
layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
this->got_, ORDER_DATA, false);
}
return this->got_;
}
// Get the dynamic reloc section, creating it if necessary.
template<int size, bool big_endian>
typename Target_powerpc<size, big_endian>::Reloc_section*
Target_powerpc<size, big_endian>::rela_dyn_section(Layout* layout)
{
if (this->rela_dyn_ == NULL)
{
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_,
ORDER_DYNAMIC_RELOCS, false);
}
return this->rela_dyn_;
}
// A class to handle the PLT data.
template<int size, bool big_endian>
class Output_data_plt_powerpc : public Output_section_data_build
{
public:
typedef Output_data_reloc<elfcpp::SHT_RELA, true,
size, big_endian> Reloc_section;
Output_data_plt_powerpc(Layout*, Target_powerpc<size, big_endian>*);
// Add an entry to the PLT.
void
add_entry(Symbol*);
// Return the .rela.plt section data.
const Reloc_section*
rel_plt() const
{
return this->rel_;
}
// Return the number of PLT entries.
unsigned int
entry_count() const
{ return (this->current_data_size() - initial_plt_entry_size) / plt_entry_size; }
// Return the offset of the first non-reserved PLT entry.
static unsigned int
first_plt_entry_offset()
{ return initial_plt_entry_size; }
// Return the size of a PLT entry.
static unsigned int
get_plt_entry_size()
{ return plt_entry_size; }
protected:
void
do_adjust_output_section(Output_section* os)
{
os->set_entsize(0);
}
private:
// The size of an entry in the PLT.
static const int plt_entry_size = size == 32 ? 4 : 24;
// The size of the first reserved entry.
static const int initial_plt_entry_size = size == 32 ? 0 : 24;
// Write out the PLT data.
void
do_write(Output_file*);
// The reloc section.
Reloc_section* rel_;
// Allows access to .glink for do_write.
Target_powerpc<size, big_endian>* targ_;
};
// Create the PLT section.
template<int size, bool big_endian>
Output_data_plt_powerpc<size, big_endian>::Output_data_plt_powerpc(Layout* layout,
Target_powerpc<size, big_endian>* targ)
: Output_section_data_build(size == 32 ? 4 : 8),
targ_(targ)
{
this->rel_ = new Reloc_section(false);
layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
elfcpp::SHF_ALLOC, this->rel_,
ORDER_DYNAMIC_PLT_RELOCS, false);
}
// Add an entry to the PLT.
template<int size, bool big_endian>
void
Output_data_plt_powerpc<size, big_endian>::add_entry(Symbol* gsym)
{
if (!gsym->has_plt_offset())
{
off_t off = this->current_data_size();
if (off == 0)
off += initial_plt_entry_size;
gsym->set_plt_offset(off);
gsym->set_needs_dynsym_entry();
this->rel_->add_global(gsym, elfcpp::R_POWERPC_JMP_SLOT, this, off, 0);
off += plt_entry_size;
this->set_current_data_size(off);
}
}
static const unsigned int addis_11_11 = 0x3d6b0000;
static const unsigned int addis_11_30 = 0x3d7e0000;
static const unsigned int addis_12_12 = 0x3d8c0000;
static const unsigned int addi_11_11 = 0x396b0000;
static const unsigned int add_0_11_11 = 0x7c0b5a14;
static const unsigned int add_11_0_11 = 0x7d605a14;
static const unsigned int b = 0x48000000;
static const unsigned int bcl_20_31 = 0x429f0005;
static const unsigned int bctr = 0x4e800420;
static const unsigned int blrl = 0x4e800021;
static const unsigned int lis_11 = 0x3d600000;
static const unsigned int lis_12 = 0x3d800000;
static const unsigned int lwzu_0_12 = 0x840c0000;
static const unsigned int lwz_0_12 = 0x800c0000;
static const unsigned int lwz_11_11 = 0x816b0000;
static const unsigned int lwz_11_30 = 0x817e0000;
static const unsigned int lwz_12_12 = 0x818c0000;
static const unsigned int mflr_0 = 0x7c0802a6;
static const unsigned int mflr_12 = 0x7d8802a6;
static const unsigned int mtctr_0 = 0x7c0903a6;
static const unsigned int mtctr_11 = 0x7d6903a6;
static const unsigned int mtlr_0 = 0x7c0803a6;
static const unsigned int nop = 0x60000000;
static const unsigned int sub_11_11_12 = 0x7d6c5850;
static const unsigned int addis_12_2 = 0x3d820000;
static const unsigned int std_2_1 = 0xf8410000;
static const unsigned int ld_11_12 = 0xe96c0000;
static const unsigned int ld_2_12 = 0xe84c0000;
static const unsigned int addi_12_12 = 0x398c0000;
static const unsigned int ld_11_2 = 0xe9620000;
static const unsigned int addi_2_2 = 0x38420000;
static const unsigned int ld_2_2 = 0xe8420000;
static const unsigned int mflr_11 = 0x7d6802a6;
static const unsigned int ld_2_11 = 0xe84b0000;
static const unsigned int mtlr_12 = 0x7d8803a6;
static const unsigned int add_12_2_11 = 0x7d825a14;
static const unsigned int li_0_0 = 0x38000000;
static const unsigned int lis_0_0 = 0x3c000000;
static const unsigned int ori_0_0_0 = 0x60000000;
// Write out the PLT.
template<int size, bool big_endian>
void
Output_data_plt_powerpc<size, big_endian>::do_write(Output_file* of)
{
if (size == 32)
{
const off_t offset = this->offset();
const section_size_type oview_size
= convert_to_section_size_type(this->data_size());
unsigned char* const oview = of->get_output_view(offset, oview_size);
unsigned char* pov = oview;
unsigned char* endpov = oview + oview_size;
// The address the .glink branch table
const Output_data_glink<size, big_endian>* glink
= this->targ_->glink_section();
elfcpp::Elf_types<32>::Elf_Addr branch_tab
= glink->address() + glink->pltresolve();
while (pov < endpov)
{
elfcpp::Swap<32, big_endian>::writeval(pov, branch_tab);
pov += 4;
branch_tab += 4;
}
of->write_output_view(offset, oview_size, oview);
}
}
// Create the PLT section.
template<int size, bool big_endian>
void
Target_powerpc<size, big_endian>::make_plt_section(Layout* layout)
{
if (this->plt_ == NULL)
{
if (this->glink_ == NULL)
make_glink_section(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, this);
layout->add_output_section_data(".plt",
(size == 32
? elfcpp::SHT_PROGBITS
: elfcpp::SHT_NOBITS),
elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
this->plt_,
(size == 32
? ORDER_SMALL_DATA
: ORDER_SMALL_BSS),
false);
}
}
// A class to handle .glink.
template<int size, bool big_endian>
class Output_data_glink : public Output_section_data
{
public:
Output_data_glink(Target_powerpc<size, big_endian>*);
// Add an entry
void
add_entry(const Symbol*, const elfcpp::Rela<size, big_endian>&,
const Sized_relobj<size, big_endian>*, unsigned int);
unsigned int
find_entry(const Symbol*, const elfcpp::Rela<size, big_endian>&,
const Sized_relobj<size, big_endian>*, unsigned int) const;
unsigned int
glink_entry_size() const
{
if (size == 32)
return 4 * 4;
else
// FIXME: We should be using multiple glink sections for
// stubs to support > 33M applications.
return 8 * 4;
}
off_t
pltresolve() const
{
return this->pltresolve_;
}
private:
static const int pltresolve_size = 16*4;
void
set_final_data_size();
// Write out .glink
void
do_write(Output_file*);
struct Glink_sym_ent
{
Glink_sym_ent(const Symbol *sym,
const elfcpp::Rela<size, big_endian>& reloc,
const Sized_relobj<size, big_endian>* object,
unsigned int shndx)
: sym_(sym), object_(0), shndx_(0), addend_(0)
{
if (size != 32)
this->addend_ = reloc.get_r_addend();
else if (parameters->options().output_is_position_independent())
{
if (object != NULL && shndx != 0)
this->addend_ = reloc.get_r_addend();
if (this->addend_ != 0)
{
this->object_ = object;
this->shndx_ = shndx;
}
}
}
const Symbol *sym_;
const Sized_relobj<size, big_endian>* object_;
unsigned int shndx_;
unsigned int addend_;
bool operator==(const Glink_sym_ent& that) const
{
return (this->sym_ == that.sym_
&& this->object_ == that.object_
&& this->shndx_ == that.shndx_
&& this->addend_ == that.addend_);
}
};
struct Glink_sym_ent_hash
{
size_t operator()(const Glink_sym_ent& ent) const
{
return (reinterpret_cast<uintptr_t>(ent.sym_)
^ reinterpret_cast<uintptr_t>(ent.object_)
^ ent.shndx_
^ ent.addend_);
}
};
// Set of sym/shndx/addend entries.
typedef Unordered_map<Glink_sym_ent, unsigned int,
Glink_sym_ent_hash> Glink_entries;
Glink_entries glink_entries_;
// Offset of pltresolve stub (actually, branch table for 32-bit)
off_t pltresolve_;
// Allows access to .got and .plt for do_write.
Target_powerpc<size, big_endian>* targ_;
};
// Create the glink section.
template<int size, bool big_endian>
Output_data_glink<size, big_endian>::Output_data_glink(Target_powerpc<size, big_endian>* targ)
: Output_section_data(16),
pltresolve_(0), targ_(targ)
{
}
// Add an entry to glink, if we do not already have one for this
// sym/addend/shndx combo.
template<int size, bool big_endian>
void
Output_data_glink<size, big_endian>
::add_entry(const Symbol* gsym,
const elfcpp::Rela<size, big_endian>& reloc,
const Sized_relobj<size, big_endian>* object,
unsigned int shndx)
{
Glink_sym_ent ent(gsym, reloc, object, shndx);
unsigned int indx = this->glink_entries_.size();
this->glink_entries_[ent] = indx;
}
template<int size, bool big_endian>
unsigned int
Output_data_glink<size, big_endian>
::find_entry(const Symbol* gsym,
const elfcpp::Rela<size, big_endian>& reloc,
const Sized_relobj<size, big_endian>* object,
unsigned int shndx) const
{
Glink_sym_ent ent(gsym, reloc, object, shndx);
typename Glink_entries::const_iterator p = this->glink_entries_.find(ent);
gold_assert(p != this->glink_entries_.end());
return p->second;
}
template<int size, bool big_endian>
void
Output_data_glink<size, big_endian>::set_final_data_size()
{
unsigned int count = this->glink_entries_.size();
off_t total = count;
if (count != 0)
{
if (size == 32)
{
total *= 16;
this->pltresolve_ = total;
// space for branch table
total += 4 * (count - 1);
total += -total & 15;
total += this->pltresolve_size;
}
else
{
total *= 32;
this->pltresolve_ = total;
total += this->pltresolve_size;
// space for branch table
total += 8 * count;
if (count > 0x8000)
total += 4 * (count - 0x8000);
}
}
this->set_data_size(total);
}
static inline uint32_t
l(uint32_t a)
{
return a & 0xffff;
}
static inline uint32_t
hi(uint32_t a)
{
return l(a >> 16);
}
static inline uint32_t
ha(uint32_t a)
{
return hi(a + 0x8000);
}
template<bool big_endian>
static inline void
write_insn(unsigned char *p, uint32_t v)
{
elfcpp::Swap<32, big_endian>::writeval(p, v);
}
// Write out .glink.
template<int size, bool big_endian>
void
Output_data_glink<size, big_endian>::do_write(Output_file* of)
{
const off_t off = this->offset();
const section_size_type oview_size =
convert_to_section_size_type(this->data_size());
unsigned char* const oview = of->get_output_view(off, oview_size);
unsigned char *p;
// The base address of the .plt section.
uint32_t plt_base = this->targ_->plt_section()->address();
// The address of _GLOBAL_OFFSET_TABLE_.
const Output_data_got_powerpc<size, big_endian> *got;
typename elfcpp::Elf_types<size>::Elf_Addr g_o_t;
got = this->targ_->got_section();
g_o_t = got->address() + got->g_o_t();
if (size == 64)
{
// Write out call stubs.
typename Glink_entries::const_iterator g;
for (g = this->glink_entries_.begin();
g != this->glink_entries_.end();
++g)
{
uint64_t plt_addr = plt_base + g->first.sym_->plt_offset();
uint64_t got_addr = g_o_t;
uint64_t pltoff = plt_addr - got_addr;
if (pltoff + 0x80008000 > 0xffffffff || (pltoff & 7) != 0)
gold_error(_("%s: linkage table error against `%s'"),
g->first.object_->name().c_str(),
g->first.sym_->demangled_name().c_str());
p = oview + g->second * this->glink_entry_size();
if (ha(pltoff) != 0)
{
write_insn<big_endian>(p, addis_12_2 + ha(pltoff)), p += 4;
write_insn<big_endian>(p, std_2_1 + 40), p += 4;
write_insn<big_endian>(p, ld_11_12 + l(pltoff)), p += 4;
if (ha(pltoff + 16) != ha(pltoff))
{
write_insn<big_endian>(p, addi_12_12 + l(pltoff)), p += 4;
pltoff = 0;
}
write_insn<big_endian>(p, mtctr_11), p += 4;
write_insn<big_endian>(p, ld_2_12 + l(pltoff + 8)), p += 4;
write_insn<big_endian>(p, ld_11_12 + l(pltoff + 16)), p += 4;
write_insn<big_endian>(p, bctr), p += 4;
}
else
{
write_insn<big_endian>(p, std_2_1 + 40), p += 4;
write_insn<big_endian>(p, ld_11_2 + l(pltoff)), p += 4;
if (ha(pltoff + 16) != ha(pltoff))
{
write_insn<big_endian>(p, addi_2_2 + l(pltoff)), p += 4;
pltoff = 0;
}
write_insn<big_endian>(p, mtctr_11), p += 4;
write_insn<big_endian>(p, ld_11_2 + l(pltoff + 16)), p += 4;
write_insn<big_endian>(p, ld_2_2 + l(pltoff + 8)), p += 4;
write_insn<big_endian>(p, bctr), p += 4;
}
}
// Write pltresolve stub.
p = oview + this->pltresolve_;
uint64_t after_bcl = this->address() + this->pltresolve_ + 16;
uint64_t pltoff = plt_base - after_bcl;
elfcpp::Swap<64, big_endian>::writeval(p, pltoff), p += 8;
write_insn<big_endian>(p, mflr_12), p += 4;
write_insn<big_endian>(p, bcl_20_31), p += 4;
write_insn<big_endian>(p, mflr_11), p += 4;
write_insn<big_endian>(p, ld_2_11 + l(-16)), p += 4;
write_insn<big_endian>(p, mtlr_12), p += 4;
write_insn<big_endian>(p, add_12_2_11), p += 4;
write_insn<big_endian>(p, ld_11_12 + 0), p += 4;
write_insn<big_endian>(p, ld_2_12 + 8), p += 4;
write_insn<big_endian>(p, mtctr_11), p += 4;
write_insn<big_endian>(p, ld_11_12 + 16), p += 4;
write_insn<big_endian>(p, bctr), p += 4;
while (p < oview + this->pltresolve_ + this->pltresolve_size)
write_insn<big_endian>(p, nop), p += 4;
// Write lazy link call stubs.
uint32_t indx = 0;
while (p < oview + oview_size)
{
if (indx < 0x8000)
{
write_insn<big_endian>(p, li_0_0 + indx), p += 4;
}
else
{
write_insn<big_endian>(p, lis_0_0 + hi(indx)), p += 4;
write_insn<big_endian>(p, ori_0_0_0 + l(indx)), p += 4;
}
uint16_t branch_off = this->pltresolve_ + 8 - (p - oview);
write_insn<big_endian>(p, b + (branch_off & 0x3fffffc)), p += 4;
indx++;
}
}
else
{
// Write out call stubs.
typename Glink_entries::const_iterator g;
for (g = this->glink_entries_.begin();
g != this->glink_entries_.end();
++g)
{
uint32_t plt_addr = plt_base + g->first.sym_->plt_offset();
uint32_t got_addr;
p = oview + g->second * this->glink_entry_size();
if (parameters->options().output_is_position_independent())
{
if (g->first.shndx_)
got_addr = (g->first.object_->output_section(g->first.shndx_)->address()
+ g->first.object_->output_section_offset(g->first.shndx_)
+ g->first.addend_);
else
got_addr = g_o_t;
uint32_t pltoff = plt_addr - got_addr;
if (ha(pltoff) == 0)
{
write_insn<big_endian>(p + 0, lwz_11_30 + l(pltoff));
write_insn<big_endian>(p + 4, mtctr_11);
write_insn<big_endian>(p + 8, bctr);
}
else
{
write_insn<big_endian>(p + 0, addis_11_30 + ha(pltoff));
write_insn<big_endian>(p + 4, lwz_11_11 + l(pltoff));
write_insn<big_endian>(p + 8, mtctr_11);
write_insn<big_endian>(p + 12, bctr);
}
}
else
{
write_insn<big_endian>(p + 0, lis_11 + ha(plt_addr));
write_insn<big_endian>(p + 4, lwz_11_11 + l(plt_addr));
write_insn<big_endian>(p + 8, mtctr_11);
write_insn<big_endian>(p + 12, bctr);
}
}
// Write out pltresolve branch table.
p = oview + this->pltresolve_;
unsigned int the_end = oview_size - this->pltresolve_size;
unsigned char *end_p = oview + the_end;
while (p < end_p - 8 * 4)
write_insn<big_endian>(p, b + end_p - p), p += 4;
while (p < end_p)
write_insn<big_endian>(p, nop), p += 4;
// Write out pltresolve call stub.
if (parameters->options().output_is_position_independent())
{
uint32_t res0_off = this->pltresolve_;
uint32_t after_bcl_off = the_end + 12;
uint32_t bcl_res0 = after_bcl_off - res0_off;
write_insn<big_endian>(p + 0, addis_11_11 + ha(bcl_res0));
write_insn<big_endian>(p + 4, mflr_0);
write_insn<big_endian>(p + 8, bcl_20_31);
write_insn<big_endian>(p + 12, addi_11_11 + l(bcl_res0));
write_insn<big_endian>(p + 16, mflr_12);
write_insn<big_endian>(p + 20, mtlr_0);
write_insn<big_endian>(p + 24, sub_11_11_12);
uint32_t got_bcl = g_o_t + 4 - (after_bcl_off + this->address());
write_insn<big_endian>(p + 28, addis_12_12 + ha(got_bcl));
if (ha(got_bcl) == ha(got_bcl + 4))
{
write_insn<big_endian>(p + 32, lwz_0_12 + l(got_bcl));
write_insn<big_endian>(p + 36, lwz_12_12 + l(got_bcl + 4));
}
else
{
write_insn<big_endian>(p + 32, lwzu_0_12 + l(got_bcl));
write_insn<big_endian>(p + 36, lwz_12_12 + 4);
}
write_insn<big_endian>(p + 40, mtctr_0);
write_insn<big_endian>(p + 44, add_0_11_11);
write_insn<big_endian>(p + 48, add_11_0_11);
write_insn<big_endian>(p + 52, bctr);
write_insn<big_endian>(p + 56, nop);
write_insn<big_endian>(p + 60, nop);
}
else
{
uint32_t res0 = this->pltresolve_ + this->address();
write_insn<big_endian>(p + 0, lis_12 + ha(g_o_t + 4));
write_insn<big_endian>(p + 4, addis_11_11 + ha(-res0));
if (ha(g_o_t + 4) == ha(g_o_t + 8))
write_insn<big_endian>(p + 8, lwz_0_12 + l(g_o_t + 4));
else
write_insn<big_endian>(p + 8, lwzu_0_12 + l(g_o_t + 4));
write_insn<big_endian>(p + 12, addi_11_11 + l(-res0));
write_insn<big_endian>(p + 16, mtctr_0);
write_insn<big_endian>(p + 20, add_0_11_11);
if (ha(g_o_t + 4) == ha(g_o_t + 8))
write_insn<big_endian>(p + 24, lwz_12_12 + l(g_o_t + 8));
else
write_insn<big_endian>(p + 24, lwz_12_12 + 4);
write_insn<big_endian>(p + 28, add_11_0_11);
write_insn<big_endian>(p + 32, bctr);
write_insn<big_endian>(p + 36, nop);
write_insn<big_endian>(p + 40, nop);
write_insn<big_endian>(p + 44, nop);
write_insn<big_endian>(p + 48, nop);
write_insn<big_endian>(p + 52, nop);
write_insn<big_endian>(p + 56, nop);
write_insn<big_endian>(p + 60, nop);
}
p += 64;
}
of->write_output_view(off, oview_size, oview);
}
// Create the glink section.
template<int size, bool big_endian>
void
Target_powerpc<size, big_endian>::make_glink_section(Layout* layout)
{
if (this->glink_ == NULL)
{
this->glink_ = new Output_data_glink<size, big_endian>(this);
layout->add_output_section_data(".text", elfcpp::SHT_PROGBITS,
elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR,
this->glink_, ORDER_TEXT, false);
}
}
// Create a PLT entry for a global symbol.
template<int size, bool big_endian>
void
Target_powerpc<size, big_endian>::make_plt_entry(Layout* layout,
Symbol* gsym,
const elfcpp::Rela<size, big_endian>& reloc,
const Sized_relobj<size, big_endian>* object)
{
if (this->plt_ == NULL)
this->make_plt_section(layout);
this->plt_->add_entry(gsym);
unsigned int got2_shndx = 0;
if (size == 32 && object != NULL)
{
const Powerpc_relobj<size, big_endian>* ppc_obj
= static_cast<const Powerpc_relobj<size, big_endian>*>(object);
got2_shndx = ppc_obj->got2_shndx();
}
this->glink_->add_entry(gsym, reloc, object, got2_shndx);
}
// 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>
unsigned int
Target_powerpc<size, big_endian>::got_mod_index_entry(
Symbol_table* symtab,
Layout* layout,
Sized_relobj_file<size, big_endian>* object)
{
if (this->got_mod_index_offset_ == -1U)
{
gold_assert(symtab != NULL && layout != NULL && object != NULL);
Reloc_section* rela_dyn = this->rela_dyn_section(layout);
Output_data_got_powerpc<size, big_endian>* got;
unsigned int got_offset;
got = this->got_section(symtab, layout);
got->reserve_ent(2);
got_offset = got->add_constant(0);
rela_dyn->add_local(object, 0, elfcpp::R_POWERPC_DTPMOD, got,
got_offset, 0);
got->add_constant(0);
this->got_mod_index_offset_ = got_offset;
}
return this->got_mod_index_offset_;
}
// Optimize the TLS relocation type based on what we know about the
// symbol. IS_FINAL is true if the final address of this symbol is
// known at link time.
template<int size, bool big_endian>
tls::Tls_optimization
Target_powerpc<size, big_endian>::optimize_tls_reloc(bool, int)
{
// If we are generating a shared library, then we can't do anything
// in the linker.
if (parameters->options().shared())
return tls::TLSOPT_NONE;
// FIXME
return tls::TLSOPT_NONE;
}
// Get the Reference_flags for a particular relocation.
template<int size, bool big_endian>
int
Target_powerpc<size, big_endian>::Scan::get_reference_flags(
unsigned int r_type)
{
switch (r_type)
{
case elfcpp::R_POWERPC_NONE:
case elfcpp::R_POWERPC_GNU_VTINHERIT:
case elfcpp::R_POWERPC_GNU_VTENTRY:
case elfcpp::R_PPC64_TOC:
// No symbol reference.
return 0;
case elfcpp::R_POWERPC_ADDR16:
case elfcpp::R_POWERPC_ADDR16_LO:
case elfcpp::R_POWERPC_ADDR16_HI:
case elfcpp::R_POWERPC_ADDR16_HA:
case elfcpp::R_POWERPC_ADDR32:
case elfcpp::R_PPC64_ADDR64:
return Symbol::ABSOLUTE_REF;
case elfcpp::R_POWERPC_REL24:
case elfcpp::R_PPC_LOCAL24PC:
case elfcpp::R_PPC_REL16:
case elfcpp::R_PPC_REL16_LO:
case elfcpp::R_PPC_REL16_HI:
case elfcpp::R_PPC_REL16_HA:
return Symbol::RELATIVE_REF;
case elfcpp::R_PPC_PLTREL24:
return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF;
case elfcpp::R_POWERPC_GOT16:
case elfcpp::R_POWERPC_GOT16_LO:
case elfcpp::R_POWERPC_GOT16_HI:
case elfcpp::R_POWERPC_GOT16_HA:
case elfcpp::R_PPC64_TOC16:
case elfcpp::R_PPC64_TOC16_LO:
case elfcpp::R_PPC64_TOC16_HI:
case elfcpp::R_PPC64_TOC16_HA:
case elfcpp::R_PPC64_TOC16_DS:
case elfcpp::R_PPC64_TOC16_LO_DS:
// Absolute in GOT.
return Symbol::ABSOLUTE_REF;
case elfcpp::R_POWERPC_GOT_TPREL16:
case elfcpp::R_POWERPC_TLS:
return Symbol::TLS_REF;
case elfcpp::R_POWERPC_COPY:
case elfcpp::R_POWERPC_GLOB_DAT:
case elfcpp::R_POWERPC_JMP_SLOT:
case elfcpp::R_POWERPC_RELATIVE:
case elfcpp::R_POWERPC_DTPMOD:
default:
// Not expected. We will give an error later.
return 0;
}
}
// Report an unsupported relocation against a local symbol.
template<int size, bool big_endian>
void
Target_powerpc<size, big_endian>::Scan::unsupported_reloc_local(
Sized_relobj_file<size, big_endian>* object,
unsigned int r_type)
{
gold_error(_("%s: unsupported reloc %u against local symbol"),
object->name().c_str(), r_type);
}
// We are about to emit a dynamic relocation of type R_TYPE. If the
// dynamic linker does not support it, issue an error.
template<int size, bool big_endian>
void
Target_powerpc<size, big_endian>::Scan::check_non_pic(Relobj* object,
unsigned int r_type)
{
gold_assert(r_type != elfcpp::R_POWERPC_NONE);
// These are the relocation types supported by glibc for both 32-bit
// and 64-bit powerpc.
switch (r_type)
{
case elfcpp::R_POWERPC_RELATIVE:
case elfcpp::R_POWERPC_GLOB_DAT:
case elfcpp::R_POWERPC_DTPMOD:
case elfcpp::R_POWERPC_DTPREL:
case elfcpp::R_POWERPC_TPREL:
case elfcpp::R_POWERPC_JMP_SLOT:
case elfcpp::R_POWERPC_COPY:
case elfcpp::R_POWERPC_ADDR32:
case elfcpp::R_POWERPC_ADDR24:
case elfcpp::R_POWERPC_REL24:
return;
default:
break;
}
if (size == 64)
{
switch (r_type)
{
// These are the relocation types supported only on 64-bit.
case elfcpp::R_PPC64_ADDR64:
case elfcpp::R_PPC64_TPREL16_LO_DS:
case elfcpp::R_PPC64_TPREL16_DS:
case elfcpp::R_POWERPC_TPREL16:
case elfcpp::R_POWERPC_TPREL16_LO:
case elfcpp::R_POWERPC_TPREL16_HI:
case elfcpp::R_POWERPC_TPREL16_HA:
case elfcpp::R_PPC64_TPREL16_HIGHER:
case elfcpp::R_PPC64_TPREL16_HIGHEST:
case elfcpp::R_PPC64_TPREL16_HIGHERA:
case elfcpp::R_PPC64_TPREL16_HIGHESTA:
case elfcpp::R_PPC64_ADDR16_LO_DS:
case elfcpp::R_POWERPC_ADDR16_LO:
case elfcpp::R_POWERPC_ADDR16_HI:
case elfcpp::R_POWERPC_ADDR16_HA:
case elfcpp::R_POWERPC_ADDR30:
case elfcpp::R_PPC64_UADDR64:
case elfcpp::R_POWERPC_UADDR32:
case elfcpp::R_POWERPC_ADDR16:
case elfcpp::R_POWERPC_UADDR16:
case elfcpp::R_PPC64_ADDR16_DS:
case elfcpp::R_PPC64_ADDR16_HIGHER:
case elfcpp::R_PPC64_ADDR16_HIGHEST:
case elfcpp::R_PPC64_ADDR16_HIGHERA:
case elfcpp::R_PPC64_ADDR16_HIGHESTA:
case elfcpp::R_POWERPC_ADDR14_BRTAKEN:
case elfcpp::R_POWERPC_ADDR14_BRNTAKEN:
case elfcpp::R_POWERPC_REL32:
case elfcpp::R_PPC64_REL64:
return;
default:
break;
}
}
else
{
switch (r_type)
{
// These are the relocation types supported only on 32-bit.
default:
break;
}
}
// This prevents us from issuing more than one error per reloc
// section. But we can still wind up issuing more than one
// error per object file.
if (this->issued_non_pic_error_)
return;
gold_assert(parameters->options().output_is_position_independent());
object->error(_("requires unsupported dynamic reloc; "
"recompile with -fPIC"));
this->issued_non_pic_error_ = true;
return;
}
// Scan a relocation for a local symbol.
template<int size, bool big_endian>
inline void
Target_powerpc<size, big_endian>::Scan::local(
Symbol_table* symtab,
Layout* layout,
Target_powerpc<size, big_endian>* target,
Sized_relobj_file<size, big_endian>* object,
unsigned int data_shndx,
Output_section* output_section,
const elfcpp::Rela<size, big_endian>& reloc,
unsigned int r_type,
const elfcpp::Sym<size, big_endian>& lsym)
{
switch (r_type)
{
case elfcpp::R_POWERPC_NONE:
case elfcpp::R_POWERPC_GNU_VTINHERIT:
case elfcpp::R_POWERPC_GNU_VTENTRY:
break;
case elfcpp::R_PPC64_ADDR64:
case elfcpp::R_POWERPC_ADDR32:
case elfcpp::R_POWERPC_ADDR16_HA:
case elfcpp::R_POWERPC_ADDR16_LO:
// If building a shared library (or a position-independent
// executable), we need to create a dynamic relocation for
// this location.
if (parameters->options().output_is_position_independent())
{
Reloc_section* rela_dyn = target->rela_dyn_section(layout);
check_non_pic(object, r_type);
if (lsym.get_st_type() != elfcpp::STT_SECTION)
{
unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
rela_dyn->add_local(object, r_sym, r_type, output_section,
data_shndx, reloc.get_r_offset(),
reloc.get_r_addend());
}
else
{
unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
gold_assert(lsym.get_st_value() == 0);
rela_dyn->add_local_relative(object, r_sym, r_type,
output_section, data_shndx,
reloc.get_r_offset(),
reloc.get_r_addend(), false);
}
}
break;
case elfcpp::R_POWERPC_REL24:
case elfcpp::R_PPC_LOCAL24PC:
case elfcpp::R_POWERPC_REL32:
case elfcpp::R_PPC_REL16_LO:
case elfcpp::R_PPC_REL16_HA:
break;
case elfcpp::R_POWERPC_GOT16:
case elfcpp::R_POWERPC_GOT16_LO:
case elfcpp::R_POWERPC_GOT16_HI:
case elfcpp::R_POWERPC_GOT16_HA:
{
// The symbol requires a GOT entry.
Output_data_got_powerpc<size, big_endian>* got;
unsigned int r_sym;
got = target->got_section(symtab, layout);
r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
// If we are generating a shared object, we need to add a
// dynamic relocation for this symbol's GOT entry.
if (parameters->options().output_is_position_independent())
{
if (!object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD))
{
Reloc_section* rela_dyn = target->rela_dyn_section(layout);
unsigned int off;
off = got->add_constant(0);
object->set_local_got_offset(r_sym, GOT_TYPE_STANDARD, off);
rela_dyn->add_local_relative(object, r_sym,
elfcpp::R_POWERPC_RELATIVE,
got, off, 0, false);
}
}
else
got->add_local(object, r_sym, GOT_TYPE_STANDARD);
}
break;
case elfcpp::R_PPC64_TOC16:
case elfcpp::R_PPC64_TOC16_LO:
case elfcpp::R_PPC64_TOC16_HI:
case elfcpp::R_PPC64_TOC16_HA:
case elfcpp::R_PPC64_TOC16_DS:
case elfcpp::R_PPC64_TOC16_LO_DS:
case elfcpp::R_PPC64_TOC:
// We need a GOT section.
target->got_section(symtab, layout);
break;
// These are relocations which should only be seen by the
// dynamic linker, and should never be seen here.
case elfcpp::R_POWERPC_COPY:
case elfcpp::R_POWERPC_GLOB_DAT:
case elfcpp::R_POWERPC_JMP_SLOT:
case elfcpp::R_POWERPC_RELATIVE:
case elfcpp::R_POWERPC_DTPMOD:
gold_error(_("%s: unexpected reloc %u in object file"),
object->name().c_str(), r_type);
break;
default:
unsupported_reloc_local(object, r_type);
break;
}
}
// Report an unsupported relocation against a global symbol.
template<int size, bool big_endian>
void
Target_powerpc<size, big_endian>::Scan::unsupported_reloc_global(
Sized_relobj_file<size, big_endian>* object,
unsigned int r_type,
Symbol* gsym)
{
gold_error(_("%s: unsupported reloc %u against global symbol %s"),
object->name().c_str(), r_type, gsym->demangled_name().c_str());
}
// Scan a relocation for a global symbol.
template<int size, bool big_endian>
inline void
Target_powerpc<size, big_endian>::Scan::global(
Symbol_table* symtab,
Layout* layout,
Target_powerpc<size, big_endian>* target,
Sized_relobj_file<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)
{
switch (r_type)
{
case elfcpp::R_POWERPC_NONE:
case elfcpp::R_POWERPC_GNU_VTINHERIT:
case elfcpp::R_POWERPC_GNU_VTENTRY:
case elfcpp::R_PPC_LOCAL24PC:
break;
case elfcpp::R_POWERPC_ADDR16:
case elfcpp::R_POWERPC_ADDR16_LO:
case elfcpp::R_POWERPC_ADDR16_HI:
case elfcpp::R_POWERPC_ADDR16_HA:
case elfcpp::R_POWERPC_ADDR32:
case elfcpp::R_PPC64_ADDR64:
{
// Make a PLT entry if necessary.
if (gsym->needs_plt_entry())
{
target->make_plt_entry(layout, gsym, reloc, 0);
// Since this is not a PC-relative relocation, we may be
// taking the address of a function. In that case we need to
// set the entry in the dynamic symbol table to the address of
// the PLT entry.
if (size == 32
&& gsym->is_from_dynobj() && !parameters->options().shared())
gsym->set_needs_dynsym_value();
}
// Make a dynamic relocation if necessary.
if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)))
{
if (gsym->may_need_copy_reloc())
{
target->copy_reloc(symtab, layout, object,
data_shndx, output_section, gsym, reloc);
}
else if ((r_type == elfcpp::R_POWERPC_ADDR32
|| r_type == elfcpp::R_PPC64_ADDR64)
&& gsym->can_use_relative_reloc(false))
{
Reloc_section* rela_dyn = target->rela_dyn_section(layout);
rela_dyn->add_global_relative(gsym, elfcpp::R_POWERPC_RELATIVE,
output_section, object,
data_shndx, reloc.get_r_offset(),
reloc.get_r_addend(), false);
}
else
{
Reloc_section* rela_dyn = target->rela_dyn_section(layout);
check_non_pic(object, r_type);
if (gsym->is_from_dynobj()
|| gsym->is_undefined()
|| gsym->is_preemptible())
rela_dyn->add_global(gsym, r_type, output_section,
object, data_shndx,
reloc.get_r_offset(),
reloc.get_r_addend());
else
rela_dyn->add_global_relative(gsym, r_type,
output_section, object,
data_shndx,
reloc.get_r_offset(),
reloc.get_r_addend(), false);
}
}
}
break;
case elfcpp::R_PPC_PLTREL24:
case elfcpp::R_POWERPC_REL24:
{
if (gsym->needs_plt_entry()
|| (!gsym->final_value_is_known()
&& !(gsym->is_defined()
&& !gsym->is_from_dynobj()
&& !gsym->is_preemptible())))
{
if (r_type == elfcpp::R_PPC_PLTREL24)
target->make_plt_entry(layout, gsym, reloc, object);
else
target->make_plt_entry(layout, gsym, reloc, 0);
}
// Make a dynamic relocation if necessary.
if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)))
{
if (gsym->may_need_copy_reloc())
{
target->copy_reloc(symtab, layout, object,
data_shndx, output_section, gsym,
reloc);
}
else
{
Reloc_section* rela_dyn = target->rela_dyn_section(layout);
check_non_pic(object, r_type);
rela_dyn->add_global(gsym, r_type, output_section, object,
data_shndx, reloc.get_r_offset(),
reloc.get_r_addend());
}
}
}
break;
case elfcpp::R_PPC_REL16:
case elfcpp::R_PPC_REL16_LO:
case elfcpp::R_PPC_REL16_HI:
case elfcpp::R_PPC_REL16_HA:
break;
case elfcpp::R_POWERPC_GOT16:
case elfcpp::R_POWERPC_GOT16_LO:
case elfcpp::R_POWERPC_GOT16_HI:
case elfcpp::R_POWERPC_GOT16_HA:
{
// The symbol requires a GOT entry.
Output_data_got_powerpc<size, big_endian>* got;
got = target->got_section(symtab, layout);
if (gsym->final_value_is_known())
got->add_global(gsym, GOT_TYPE_STANDARD);
else
{
// If this symbol is not fully resolved, we need to add a
// dynamic relocation for it.
Reloc_section* rela_dyn = target->rela_dyn_section(layout);
if (gsym->is_from_dynobj()
|| gsym->is_undefined()
|| gsym->is_preemptible())
got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, rela_dyn,
elfcpp::R_POWERPC_GLOB_DAT);
else if (!gsym->has_got_offset(GOT_TYPE_STANDARD))
{
unsigned int off = got->add_constant(0);
gsym->set_got_offset(GOT_TYPE_STANDARD, off);
rela_dyn->add_global_relative(gsym, elfcpp::R_POWERPC_RELATIVE,
got, off, 0, false);
}
}
}
break;
case elfcpp::R_PPC64_TOC:
case elfcpp::R_PPC64_TOC16:
case elfcpp::R_PPC64_TOC16_LO:
case elfcpp::R_PPC64_TOC16_HI:
case elfcpp::R_PPC64_TOC16_HA:
case elfcpp::R_PPC64_TOC16_DS:
case elfcpp::R_PPC64_TOC16_LO_DS:
// We need a GOT section.
target->got_section(symtab, layout);
break;
case elfcpp::R_POWERPC_GOT_TPREL16:
case elfcpp::R_POWERPC_TLS:
// XXX TLS
break;
// These are relocations which should only be seen by the
// dynamic linker, and should never be seen here.
case elfcpp::R_POWERPC_COPY:
case elfcpp::R_POWERPC_GLOB_DAT:
case elfcpp::R_POWERPC_JMP_SLOT:
case elfcpp::R_POWERPC_RELATIVE:
case elfcpp::R_POWERPC_DTPMOD:
gold_error(_("%s: unexpected reloc %u in object file"),
object->name().c_str(), r_type);
break;
default:
unsupported_reloc_global(object, r_type, gsym);
break;
}
}
// Process relocations for gc.
template<int size, bool big_endian>
void
Target_powerpc<size, big_endian>::gc_process_relocs(
Symbol_table* symtab,
Layout* layout,
Sized_relobj_file<size, big_endian>* object,
unsigned int data_shndx,
unsigned int,
const unsigned char* prelocs,
size_t reloc_count,
Output_section* output_section,
bool needs_special_offset_handling,
size_t local_symbol_count,
const unsigned char* plocal_symbols)
{
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,
typename Target_powerpc::Relocatable_size_for_reloc>(
symtab,
layout,
this,
object,
data_shndx,
prelocs,
reloc_count,
output_section,
needs_special_offset_handling,
local_symbol_count,
plocal_symbols);
}
// Scan relocations for a section.
template<int size, bool big_endian>
void
Target_powerpc<size, big_endian>::scan_relocs(
Symbol_table* symtab,
Layout* layout,
Sized_relobj_file<size, big_endian>* object,
unsigned int data_shndx,
unsigned int sh_type,
const unsigned char* prelocs,
size_t reloc_count,
Output_section* output_section,
bool needs_special_offset_handling,
size_t local_symbol_count,
const unsigned char* plocal_symbols)
{
typedef Target_powerpc<size, big_endian> Powerpc;
typedef typename Target_powerpc<size, big_endian>::Scan Scan;
if (sh_type == elfcpp::SHT_REL)
{
gold_error(_("%s: unsupported REL reloc section"),
object->name().c_str());
return;
}
if (size == 32)
{
static Output_data_space* sdata;
// Define _SDA_BASE_ at the start of the .sdata section.
if (sdata == NULL)
{
// layout->find_output_section(".sdata") == NULL
sdata = new Output_data_space(4, "** sdata");
Output_section* os
= layout->add_output_section_data(".sdata", 0,
elfcpp::SHF_ALLOC
| elfcpp::SHF_WRITE,
sdata, ORDER_SMALL_DATA, false);
symtab->define_in_output_data("_SDA_BASE_", NULL,
Symbol_table::PREDEFINED,
os, 32768, 0, elfcpp::STT_OBJECT,
elfcpp::STB_LOCAL, elfcpp::STV_HIDDEN,
0, false, false);
}
}
gold::scan_relocs<size, big_endian, Powerpc, elfcpp::SHT_RELA, Scan>(
symtab,
layout,
this,
object,
data_shndx,
prelocs,
reloc_count,
output_section,
needs_special_offset_handling,
local_symbol_count,
plocal_symbols);
}
// Finalize the sections.
template<int size, bool big_endian>
void
Target_powerpc<size, big_endian>::do_finalize_sections(
Layout* layout,
const Input_objects*,
Symbol_table*)
{
// Fill in some more dynamic tags.
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);
if (size == 32)
{
this->got_->finalize_data_size();
Output_data_dynamic* odyn = layout->dynamic_data();
odyn->add_section_plus_offset(elfcpp::DT_PPC_GOT,
this->got_, this->got_->g_o_t());
}
// Emit any relocs we saved in an attempt to avoid generating COPY
// relocs.
if (this->copy_relocs_.any_saved_relocs())
this->copy_relocs_.emit(this->rela_dyn_section(layout));
}
// Perform a relocation.
template<int size, bool big_endian>
inline bool
Target_powerpc<size, big_endian>::Relocate::relocate(
const Relocate_info<size, big_endian>* relinfo,
Target_powerpc* target,
Output_section* os,
size_t relnum,
const elfcpp::Rela<size, big_endian>& rela,
unsigned int r_type,
const Sized_symbol<size>* gsym,
const Symbol_value<size>* psymval,
unsigned char* view,
typename elfcpp::Elf_types<size>::Elf_Addr address,
section_size_type /* view_size */)
{
const unsigned int toc_base_offset = 0x8000;
typedef Powerpc_relocate_functions<size, big_endian> Reloc;
const Powerpc_relobj<size, big_endian>* const object
= static_cast<const Powerpc_relobj<size, big_endian>*>(relinfo->object);
elfcpp::Elf_Xword value;
if (r_type == elfcpp::R_POWERPC_GOT16
|| r_type == elfcpp::R_POWERPC_GOT16_LO
|| r_type == elfcpp::R_POWERPC_GOT16_HI
|| r_type == elfcpp::R_POWERPC_GOT16_HA
|| r_type == elfcpp::R_PPC64_GOT16_DS
|| r_type == elfcpp::R_PPC64_GOT16_LO_DS)
{
if (gsym != NULL)
{
gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
value = gsym->got_offset(GOT_TYPE_STANDARD);
}
else
{
unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD));
value = object->local_got_offset(r_sym, GOT_TYPE_STANDARD);
}
value -= target->got_section()->g_o_t();
}
else if (r_type == elfcpp::R_PPC64_TOC)
{
value = target->got_section()->address() + toc_base_offset;
}
else if (gsym != NULL
&& (r_type == elfcpp::R_POWERPC_REL24
|| r_type == elfcpp::R_PPC_PLTREL24)
&& gsym->use_plt_offset(Scan::get_reference_flags(r_type)))
{
const Output_data_glink<size, big_endian>* glink;
glink = target->glink_section();
unsigned int shndx = 0;
if (size == 32 && r_type == elfcpp::R_PPC_PLTREL24)
shndx = object->got2_shndx();
unsigned int glink_index = glink->find_entry(gsym, rela, object, shndx);
value = glink->address() + glink_index * glink->glink_entry_size();
}
else
{
elfcpp::Elf_Xword addend = 0;
if (r_type != elfcpp::R_PPC_PLTREL24)
addend = rela.get_r_addend();
value = psymval->value(object, addend);
}
switch (r_type)
{
case elfcpp::R_PPC64_TOC16:
case elfcpp::R_PPC64_TOC16_LO:
case elfcpp::R_PPC64_TOC16_HI:
case elfcpp::R_PPC64_TOC16_HA:
case elfcpp::R_PPC64_TOC16_DS:
case elfcpp::R_PPC64_TOC16_LO_DS:
// Subtract the TOC base address.
value -= target->got_section()->address() + toc_base_offset;
break;
case elfcpp::R_POWERPC_SECTOFF:
case elfcpp::R_POWERPC_SECTOFF_LO:
case elfcpp::R_POWERPC_SECTOFF_HI:
case elfcpp::R_POWERPC_SECTOFF_HA:
case elfcpp::R_PPC64_SECTOFF_DS:
case elfcpp::R_PPC64_SECTOFF_LO_DS:
if (os != NULL)
value -= os->address();
break;
default:
break;
}
switch (r_type)
{
case elfcpp::R_POWERPC_NONE:
case elfcpp::R_POWERPC_GNU_VTINHERIT:
case elfcpp::R_POWERPC_GNU_VTENTRY:
break;
case elfcpp::R_POWERPC_REL32:
Reloc::rel32(view, value, 0, address);
break;
case elfcpp::R_POWERPC_REL24:
case elfcpp::R_PPC_PLTREL24:
case elfcpp::R_PPC_LOCAL24PC:
Reloc::rel24(view, value, 0, address);
break;
case elfcpp::R_POWERPC_REL14:
Reloc::rel14(view, value, 0, address);
break;
case elfcpp::R_PPC64_ADDR64:
case elfcpp::R_PPC64_TOC:
Relocate_functions<size, big_endian>::rela64(view, value, 0);
break;
case elfcpp::R_POWERPC_ADDR32:
Relocate_functions<size, big_endian>::rela32(view, value, 0);
break;
case elfcpp::R_POWERPC_ADDR16:
case elfcpp::R_PPC64_TOC16:
case elfcpp::R_POWERPC_GOT16:
case elfcpp::R_POWERPC_SECTOFF:
Reloc::addr16(view, value, 0);
break;
case elfcpp::R_POWERPC_ADDR16_LO:
case elfcpp::R_PPC64_TOC16_LO:
case elfcpp::R_POWERPC_GOT16_LO:
case elfcpp::R_POWERPC_SECTOFF_LO:
Reloc::addr16_lo(view, value, 0);
break;
case elfcpp::R_POWERPC_ADDR16_HI:
case elfcpp::R_PPC64_TOC16_HI:
case elfcpp::R_POWERPC_GOT16_HI:
case elfcpp::R_POWERPC_SECTOFF_HI:
Reloc::addr16_hi(view, value, 0);
break;
case elfcpp::R_POWERPC_ADDR16_HA:
case elfcpp::R_PPC64_TOC16_HA:
case elfcpp::R_POWERPC_GOT16_HA:
case elfcpp::R_POWERPC_SECTOFF_HA:
Reloc::addr16_ha(view, value, 0);
break;
case elfcpp::R_PPC_REL16_LO:
Reloc::rel16_lo(view, value, 0, address);
break;
case elfcpp::R_PPC_REL16_HI:
Reloc::rel16_hi(view, value, 0, address);
break;
case elfcpp::R_PPC_REL16_HA:
Reloc::rel16_ha(view, value, 0, address);
break;
case elfcpp::R_PPC64_ADDR16_DS:
case elfcpp::R_PPC64_ADDR16_LO_DS:
case elfcpp::R_PPC64_TOC16_DS:
case elfcpp::R_PPC64_TOC16_LO_DS:
case elfcpp::R_PPC64_GOT16_DS:
case elfcpp::R_PPC64_GOT16_LO_DS:
case elfcpp::R_PPC64_SECTOFF_DS:
case elfcpp::R_PPC64_SECTOFF_LO_DS:
Reloc::addr16_ds(view, value, 0);
break;
case elfcpp::R_POWERPC_COPY:
case elfcpp::R_POWERPC_GLOB_DAT:
case elfcpp::R_POWERPC_JMP_SLOT:
case elfcpp::R_POWERPC_RELATIVE:
// This is an outstanding tls reloc, which is unexpected when
// linking.
case elfcpp::R_POWERPC_DTPMOD:
gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
_("unexpected reloc %u in object file"),
r_type);
break;
default:
gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
_("unsupported reloc %u"),
r_type);
break;
}
return true;
}
// Perform a TLS relocation.
template<int size, bool big_endian>
inline void
Target_powerpc<size, big_endian>::Relocate::relocate_tls(
const Relocate_info<size, big_endian>* relinfo,
Target_powerpc<size, big_endian>* target,
size_t relnum,
const elfcpp::Rela<size, big_endian>& rela,
unsigned int r_type,
const Sized_symbol<size>* gsym,
const Symbol_value<size>* psymval,
unsigned char* view,
typename elfcpp::Elf_types<size>::Elf_Addr address,
section_size_type)
{
Output_segment* tls_segment = relinfo->layout->tls_segment();
const Sized_relobj_file<size, big_endian>* object = relinfo->object;
const elfcpp::Elf_Xword addend = rela.get_r_addend();
typename elfcpp::Elf_types<size>::Elf_Addr value = psymval->value(object, 0);
const bool is_final =
(gsym == NULL
? !parameters->options().output_is_position_independent()
: gsym->final_value_is_known());
switch (r_type)
{
// XXX
}
}
// Relocate section data.
template<int size, bool big_endian>
void
Target_powerpc<size, big_endian>::relocate_section(
const Relocate_info<size, big_endian>* relinfo,
unsigned int sh_type,
const unsigned char* prelocs,
size_t reloc_count,
Output_section* output_section,
bool needs_special_offset_handling,
unsigned char* view,
typename elfcpp::Elf_types<size>::Elf_Addr address,
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;
gold_assert(sh_type == elfcpp::SHT_RELA);
gold::relocate_section<size, big_endian, Powerpc, elfcpp::SHT_RELA,
Powerpc_relocate>(
relinfo,
this,
prelocs,
reloc_count,
output_section,
needs_special_offset_handling,
view,
address,
view_size,
reloc_symbol_changes);
}
class Powerpc_scan_relocatable_reloc
{
public:
// Return the strategy to use for a local symbol which is not a
// section symbol, given the relocation type.
inline Relocatable_relocs::Reloc_strategy
local_non_section_strategy(unsigned int r_type, Relobj*, unsigned int r_sym)
{
if (r_type == 0 && r_sym == 0)
return Relocatable_relocs::RELOC_DISCARD;
return Relocatable_relocs::RELOC_COPY;
}
// Return the strategy to use for a local symbol which is a section
// symbol, given the relocation type.
inline Relocatable_relocs::Reloc_strategy
local_section_strategy(unsigned int, Relobj*)
{
return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA;
}
// Return the strategy to use for a global symbol, given the
// relocation type, the object, and the symbol index.
inline Relocatable_relocs::Reloc_strategy
global_strategy(unsigned int r_type, Relobj*, unsigned int)
{
if (r_type == elfcpp::R_PPC_PLTREL24)
return Relocatable_relocs::RELOC_SPECIAL;
return Relocatable_relocs::RELOC_COPY;
}
};
// Scan the relocs during a relocatable link.
template<int size, bool big_endian>
void
Target_powerpc<size, big_endian>::scan_relocatable_relocs(
Symbol_table* symtab,
Layout* layout,
Sized_relobj_file<size, big_endian>* object,
unsigned int data_shndx,
unsigned int sh_type,
const unsigned char* prelocs,
size_t reloc_count,
Output_section* output_section,
bool needs_special_offset_handling,
size_t local_symbol_count,
const unsigned char* plocal_symbols,
Relocatable_relocs* rr)
{
gold_assert(sh_type == elfcpp::SHT_RELA);
gold::scan_relocatable_relocs<size, big_endian, elfcpp::SHT_RELA,
Powerpc_scan_relocatable_reloc>(
symtab,
layout,
object,
data_shndx,
prelocs,
reloc_count,
output_section,
needs_special_offset_handling,
local_symbol_count,
plocal_symbols,
rr);
}
// Relocate a section during a relocatable link.
template<int size, bool big_endian>
void
Target_powerpc<size, big_endian>::relocate_for_relocatable(
const Relocate_info<size, big_endian>* relinfo,
unsigned int sh_type,
const unsigned char* prelocs,
size_t reloc_count,
Output_section* output_section,
off_t offset_in_output_section,
const Relocatable_relocs* rr,
unsigned char*,
typename elfcpp::Elf_types<size>::Elf_Addr,
section_size_type,
unsigned char* reloc_view,
section_size_type reloc_view_size)
{
gold_assert(sh_type == elfcpp::SHT_RELA);
typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
typedef typename Reloc_types<elfcpp::SHT_RELA, size, big_endian>::Reloc
Reltype;
typedef typename Reloc_types<elfcpp::SHT_RELA, size, big_endian>::Reloc_write
Reltype_write;
const int reloc_size
= Reloc_types<elfcpp::SHT_RELA, size, big_endian>::reloc_size;
const Address invalid_address = static_cast<Address>(0) - 1;
Powerpc_relobj<size, big_endian>* const object
= static_cast<Powerpc_relobj<size, big_endian>*>(relinfo->object);
const unsigned int local_count = object->local_symbol_count();
unsigned int got2_shndx = object->got2_shndx();
typename elfcpp::Elf_types<size>::Elf_Swxword got2_addend = 0;
if (got2_shndx != 0)
got2_addend = object->get_output_section_offset(got2_shndx);
unsigned char* pwrite = reloc_view;
for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size)
{
Relocatable_relocs::Reloc_strategy strategy = rr->strategy(i);
if (strategy == Relocatable_relocs::RELOC_DISCARD)
continue;
Reltype reloc(prelocs);
Reltype_write reloc_write(pwrite);
typename elfcpp::Elf_types<size>::Elf_WXword r_info = reloc.get_r_info();
const unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info);
const unsigned int r_type = elfcpp::elf_r_type<size>(r_info);
// Get the new symbol index.
unsigned int new_symndx;
if (r_sym < local_count)
{
switch (strategy)
{
case Relocatable_relocs::RELOC_COPY:
case Relocatable_relocs::RELOC_SPECIAL:
new_symndx = object->symtab_index(r_sym);
gold_assert(new_symndx != -1U);
break;
case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA:
{
// We are adjusting a section symbol. We need to find
// the symbol table index of the section symbol for
// the output section corresponding to input section
// in which this symbol is defined.
gold_assert(r_sym < local_count);
bool is_ordinary;
unsigned int shndx =
object->local_symbol_input_shndx(r_sym, &is_ordinary);
gold_assert(is_ordinary);
Output_section* os = object->output_section(shndx);
gold_assert(os != NULL);
gold_assert(os->needs_symtab_index());
new_symndx = os->symtab_index();
}
break;
default:
gold_unreachable();
}
}
else
{
const Symbol* gsym = object->global_symbol(r_sym);
gold_assert(gsym != NULL);
if (gsym->is_forwarder())
gsym = relinfo->symtab->resolve_forwards(gsym);
gold_assert(gsym->has_symtab_index());
new_symndx = gsym->symtab_index();
}
// Get the new offset--the location in the output section where
// this relocation should be applied.
Address offset = reloc.get_r_offset();
Address new_offset;
if (static_cast<Address>(offset_in_output_section) != invalid_address)
new_offset = offset + offset_in_output_section;
else
{
section_offset_type sot_offset =
convert_types<section_offset_type, Address>(offset);
section_offset_type new_sot_offset =
output_section->output_offset(object, relinfo->data_shndx,
sot_offset);
gold_assert(new_sot_offset != -1);
new_offset = new_sot_offset;
}
reloc_write.put_r_offset(new_offset);
reloc_write.put_r_info(elfcpp::elf_r_info<size>(new_symndx, r_type));
// Handle the reloc addend based on the strategy.
typename elfcpp::Elf_types<size>::Elf_Swxword addend;
addend = Reloc_types<elfcpp::SHT_RELA, size, big_endian>::
get_reloc_addend(&reloc);
if (strategy == Relocatable_relocs::RELOC_COPY)
;
else if (strategy == Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA)
{
const Symbol_value<size>* psymval = object->local_symbol(r_sym);
addend = psymval->value(object, addend);
}
else if (strategy == Relocatable_relocs::RELOC_SPECIAL)
{
if (addend >= 32768)
addend += got2_addend;
}
else
gold_unreachable();
Reloc_types<elfcpp::SHT_RELA, size, big_endian>::
set_reloc_addend(&reloc_write, addend);
pwrite += reloc_size;
}
gold_assert(static_cast<section_size_type>(pwrite - reloc_view)
== reloc_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.
template<int size, bool big_endian>
uint64_t
Target_powerpc<size, big_endian>::do_dynsym_value(const Symbol* gsym) const
{
if (size == 32)
{
gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
return this->plt_section()->address() + gsym->plt_offset();
}
else
gold_unreachable();
}
// The selector for powerpc object files.
template<int size, bool big_endian>
class Target_selector_powerpc : public Target_selector
{
public:
Target_selector_powerpc()
: Target_selector(elfcpp::EM_NONE, size, big_endian,
(size == 64
? (big_endian ? "elf64-powerpc" : "elf64-powerpcle")
: (big_endian ? "elf32-powerpc" : "elf32-powerpcle")),
(size == 64
? (big_endian ? "elf64ppc" : "elf64lppc")
: (big_endian ? "elf32ppc" : "elf32lppc")))
{ }
virtual Target*
do_recognize(Input_file*, off_t, int machine, int, int)
{
switch (size)
{
case 64:
if (machine != elfcpp::EM_PPC64)
return NULL;
break;
case 32:
if (machine != elfcpp::EM_PPC)
return NULL;
break;
default:
return NULL;
}
return this->instantiate_target();
}
virtual Target*
do_instantiate_target()
{ return new Target_powerpc<size, big_endian>(); }
};
Target_selector_powerpc<32, true> target_selector_ppc32;
Target_selector_powerpc<32, false> target_selector_ppc32le;
Target_selector_powerpc<64, true> target_selector_ppc64;
Target_selector_powerpc<64, false> target_selector_ppc64le;
} // End anonymous namespace.
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