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* powerpc.cc: Formatting and white space. 

(Powerpc_relobj): Rename got2_section_ to special_.
	Add opd_ent_shndx_ and opd_ent_off_ vectors.
	(Powerpc_relobj::opd_shndx, init_opd, get_opd_ent, set_opd_ent,
	scan_opd_relocs, do_read_relocs, opd_ent_ndx): New functions.
	(Target_powerpc): Add Address typedef and invalid_address.  Use
	throughout.
	(Target_powerpc::is_branch_reloc): New function.
	(Powerpc_relocate_functions): Add Address typedef, use throughout.
	(Powerpc_relocate_functions:rela, rela_ua): Correct type used
	for dst_mask, value and addend.
	(Powerpc_relobj::do_find_special_sections): Find .opd for 64-bit.
	(ld_2_1, cror_15_15_15, cror_31_31_31): New insn constants.
	(Output_data_glink::do_write): Correct toc base.  Don't try to use
	uint16_t for 24-bit offset.  Use get_output_section_offset and
	check return.
	(Target_powerpc::Scan::local): Handle more relocs.
	(Target_powerpc::do_finalize_sections): Set up DT_PPC64_GLINK.
	(Target_powerpc::Relocate::relocate): Correct toc base calculation.
	Plug in toc restoring insn after plt calls.  Translate branches
	to function descriptor symbols to corresponding entry point.
	(Target_powerpc::relocate_for_relocatable): Check return from
	get_output_section_offset.
	* symtab.h: Comment typo.
This commit is contained in:
Alan Modra 2012-08-18 11:12:50 +00:00
parent 13c9750ebf
commit c9269dff67
3 changed files with 410 additions and 213 deletions
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27
gold/ChangeLog
View File

@ -1,3 +1,30 @@
2012-08-18 Alan Modra <amodra@gmail.com>
* powerpc.cc: Formatting and white space.
(Powerpc_relobj): Rename got2_section_ to special_.
Add opd_ent_shndx_ and opd_ent_off_ vectors.
(Powerpc_relobj::opd_shndx, init_opd, get_opd_ent, set_opd_ent,
scan_opd_relocs, do_read_relocs, opd_ent_ndx): New functions.
(Target_powerpc): Add Address typedef and invalid_address. Use
throughout.
(Target_powerpc::is_branch_reloc): New function.
(Powerpc_relocate_functions): Add Address typedef, use throughout.
(Powerpc_relocate_functions:rela, rela_ua): Correct type used
for dst_mask, value and addend.
(Powerpc_relobj::do_find_special_sections): Find .opd for 64-bit.
(ld_2_1, cror_15_15_15, cror_31_31_31): New insn constants.
(Output_data_glink::do_write): Correct toc base. Don't try to use
uint16_t for 24-bit offset. Use get_output_section_offset and
check return.
(Target_powerpc::Scan::local): Handle more relocs.
(Target_powerpc::do_finalize_sections): Set up DT_PPC64_GLINK.
(Target_powerpc::Relocate::relocate): Correct toc base calculation.
Plug in toc restoring insn after plt calls. Translate branches
to function descriptor symbols to corresponding entry point.
(Target_powerpc::relocate_for_relocatable): Check return from
get_output_section_offset.
* symtab.h: Comment typo.
2012-08-14 Ian Lance Taylor <iant@google.com>
* x86_64.cc (Target_x86_64::Scan::global): Fix erroneous call to

594
gold/powerpc.cc
View File

@ -57,29 +57,106 @@ template<int size, bool big_endian>
class Powerpc_relobj : public Sized_relobj_file<size, big_endian>
{
public:
typedef typename elfcpp::Elf_types<size>::Elf_Off Offset;
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)
special_(0), opd_ent_shndx_(), opd_ent_off_()
{ }
~Powerpc_relobj()
{ }
// The .got2 section shndx.
unsigned int
got2_shndx() const
{
if (size == 32)
return this->got2_section_;
return this->special_;
else
return 0;
}
// The .opd section shndx.
unsigned int
opd_shndx() const
{
if (size == 32)
return 0;
else
return this->special_;
}
// Init OPD entry arrays.
void
init_opd(size_t opd_size)
{
size_t count = this->opd_ent_ndx(opd_size);
this->opd_ent_shndx_.resize(count);
this->opd_ent_off_.reserve(count);
}
// Return section and offset of function entry for .opd + R_OFF.
void
get_opd_ent(typename elfcpp::Elf_types<size>::Elf_Addr r_off,
unsigned int* shndx,
typename elfcpp::Elf_types<size>::Elf_Addr* value)
{
size_t ndx = this->opd_ent_ndx(r_off);
gold_assert(ndx < this->opd_ent_shndx_.size());
gold_assert(this->opd_ent_shndx_[ndx] != 0);
*shndx = this->opd_ent_shndx_[ndx];
*value = this->opd_ent_off_[ndx];
}
// Set section and offset of function entry for .opd + R_OFF.
void
set_opd_ent(typename elfcpp::Elf_types<size>::Elf_Addr r_off,
unsigned int shndx,
typename elfcpp::Elf_types<size>::Elf_Addr value)
{
size_t ndx = this->opd_ent_ndx(r_off);
gold_assert(ndx < this->opd_ent_shndx_.size());
this->opd_ent_shndx_[ndx] = shndx;
this->opd_ent_off_[ndx] = value;
}
// Examine .rela.opd to build info about function entry points.
void
scan_opd_relocs(size_t reloc_count,
const unsigned char* prelocs,
const unsigned char* plocal_syms);
void
do_read_relocs(Read_relocs_data*);
bool
do_find_special_sections(Read_symbols_data* sd);
private:
unsigned int got2_section_;
// Return index into opd_ent_shndx or opd_ent_off array for .opd entry
// at OFF. .opd entries are 24 bytes long, but they can be spaced
// 16 bytes apart when the language doesn't use the last 8-byte
// word, the environment pointer. Thus dividing the entry section
// offset by 16 will give an index into opd_ent_shndx_ and
// opd_ent_off_ that works for either layout of .opd. (It leaves
// some elements of the vectors unused when .opd entries are spaced
// 24 bytes apart, but we don't know the spacing until relocations
// are processed, and in any case it is possible for an object to
// have some entries spaced 16 bytes apart and others 24 bytes apart.)
size_t
opd_ent_ndx(size_t off) const
{ return off >> 4;}
// For 32-bit the .got2 section shdnx, for 64-bit the .opd section shndx.
unsigned int special_;
// The first 8-byte word of an OPD entry gives the address of the
// entry point of the function. Relocatable object files have a
// relocation on this word. The following two vectors record the
// section and offset specified by these relocations.
std::vector<unsigned int> opd_ent_shndx_;
std::vector<Offset> opd_ent_off_;
};
template<int size, bool big_endian>
@ -88,6 +165,8 @@ class Target_powerpc : public Sized_target<size, big_endian>
public:
typedef
Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> Reloc_section;
typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
static const Address invalid_address = static_cast<Address>(0) - 1;
Target_powerpc()
: Sized_target<size, big_endian>(&powerpc_info),
@ -156,7 +235,7 @@ class Target_powerpc : public Sized_target<size, big_endian>
Output_section* output_section,
bool needs_special_offset_handling,
unsigned char* view,
typename elfcpp::Elf_types<size>::Elf_Addr view_address,
Address view_address,
section_size_type view_size,
const Reloc_symbol_changes*);
@ -185,7 +264,7 @@ class Target_powerpc : public Sized_target<size, big_endian>
off_t offset_in_output_section,
const Relocatable_relocs*,
unsigned char*,
typename elfcpp::Elf_types<size>::Elf_Addr,
Address,
section_size_type,
unsigned char* reloc_view,
section_size_type reloc_view_size);
@ -342,6 +421,19 @@ class Target_powerpc : public Sized_target<size, big_endian>
typename elfcpp::Elf_types<size>::Elf_Addr,
section_size_type);
inline bool
is_branch_reloc(unsigned int r_type) const
{
return (r_type == elfcpp::R_POWERPC_REL24
|| r_type == elfcpp::R_POWERPC_REL14
|| r_type == elfcpp::R_POWERPC_REL14_BRTAKEN
|| r_type == elfcpp::R_POWERPC_REL14_BRNTAKEN
|| r_type == elfcpp::R_POWERPC_ADDR24
|| r_type == elfcpp::R_POWERPC_ADDR14
|| r_type == elfcpp::R_POWERPC_ADDR14_BRTAKEN
|| r_type == elfcpp::R_POWERPC_ADDR14_BRNTAKEN);
}
private:
// Do a TLS relocation.
inline void
@ -460,8 +552,8 @@ Target::Target_info Target_powerpc<32, true>::powerpc_info =
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
false, // isolate_execinstr
0, // rosegment_gap
elfcpp::SHN_UNDEF, // small_common_shndx
elfcpp::SHN_UNDEF, // large_common_shndx
0, // small_common_section_flags
@ -486,8 +578,8 @@ Target::Target_info Target_powerpc<32, false>::powerpc_info =
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
false, // isolate_execinstr
0, // rosegment_gap
elfcpp::SHN_UNDEF, // small_common_shndx
elfcpp::SHN_UNDEF, // large_common_shndx
0, // small_common_section_flags
@ -512,8 +604,8 @@ Target::Target_info Target_powerpc<64, true>::powerpc_info =
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
false, // isolate_execinstr
0, // rosegment_gap
elfcpp::SHN_UNDEF, // small_common_shndx
elfcpp::SHN_UNDEF, // large_common_shndx
0, // small_common_section_flags
@ -538,8 +630,8 @@ Target::Target_info Target_powerpc<64, false>::powerpc_info =
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
false, // isolate_execinstr
0, // rosegment_gap
elfcpp::SHN_UNDEF, // small_common_shndx
elfcpp::SHN_UNDEF, // large_common_shndx
0, // small_common_section_flags
@ -552,23 +644,25 @@ template<int size, bool big_endian>
class Powerpc_relocate_functions
{
private:
typedef Powerpc_relocate_functions<size, big_endian> This;
typedef Relocate_functions<size, big_endian> This_reloc;
typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
// 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)
typename elfcpp::Valtype_base<valsize>::Valtype dst_mask,
Address value,
Address 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);
}
@ -577,161 +671,175 @@ private:
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)
typename elfcpp::Valtype_base<valsize>::Valtype dst_mask,
Address value,
Address addend)
{
typedef typename elfcpp::Swap_unaligned<valsize,
big_endian>::Valtype Valtype;
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)
rel32(unsigned char* view, Address value, Address addend, Address 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);
}
rel24(unsigned char* view, Address value, Address addend, Address 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);
}
rel14(unsigned char* view, Address value, Address addend, Address 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)
addr16(unsigned char* view, Address value, Address 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);
}
addr16_ds(unsigned char* view, Address value, Address 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)
addr16_lo(unsigned char* view, Address value, Address 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);
}
addr16_hi(unsigned char* view, Address value, Address 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.
// R_POWERPC_ADDR16_HA: ((Symbol + Addend + 0x8000) >> 16) & 0xffff
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);
}
addr16_ha(unsigned char* view, Address value, Address addend)
{ This::addr16_hi(view, value + 0x8000, addend); }
// R_POWERPC_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)
rel16(unsigned char* view, Address value, Address addend, Address address)
{ This_reloc::pcrela16(view, value, addend, address); }
// R_POWERPC_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)
rel16_lo(unsigned char* view, Address value, Address addend, Address address)
{ This_reloc::pcrela16(view, value, addend, address); }
// R_POWERPC_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);
}
rel16_hi(unsigned char* view, Address value, Address addend, Address address)
{ This::template rela<16>(view, 16, 0xffff, value - address, addend); }
// R_POWERPC_REL16_HA: Same as R_POWERPC_REL16_HI except that if the
// final value of the low 16 bits of the
// relocation is negative, add one.
// R_POWERPC_REL16_HA: ((Symbol + Addend + 0x8000 - Address) >> 16) & 0xffff
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);
}
rel16_ha(unsigned char* view, Address value, Address addend, Address address)
{ This::rel16_hi(view, value + 0x8000, addend, address); }
};
// Stash away the index of .got2 in a relocatable object, if such
// a section exists.
// Stash away the index of .got2 or .opd 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;
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->got2_section_ = ndx;
}
s = this->find_shdr(pshdrs, size == 32 ? ".got2" : ".opd",
names, names_size, NULL);
if (s != NULL)
{
unsigned int ndx = (s - pshdrs) / elfcpp::Elf_sizes<size>::shdr_size;
this->special_ = ndx;
}
return Sized_relobj_file<size, big_endian>::do_find_special_sections(sd);
}
// Examine .rela.opd to build info about function entry points.
template<int size, bool big_endian>
void
Powerpc_relobj<size, big_endian>::scan_opd_relocs(
size_t reloc_count,
const unsigned char* prelocs,
const unsigned char* plocal_syms)
{
if (size == 64)
{
typedef typename Reloc_types<elfcpp::SHT_RELA, size, big_endian>::Reloc
Reltype;
const int reloc_size
= Reloc_types<elfcpp::SHT_RELA, size, big_endian>::reloc_size;
const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size)
{
Reltype reloc(prelocs);
typename elfcpp::Elf_types<size>::Elf_WXword r_info
= reloc.get_r_info();
unsigned int r_type = elfcpp::elf_r_type<size>(r_info);
if (r_type == elfcpp::R_PPC64_ADDR64)
{
unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info);
typename elfcpp::Elf_types<size>::Elf_Addr value;
bool is_ordinary;
unsigned int shndx;
if (r_sym < this->local_symbol_count())
{
typename elfcpp::Sym<size, big_endian>
lsym(plocal_syms + r_sym * sym_size);
shndx = lsym.get_st_shndx();
shndx = this->adjust_sym_shndx(r_sym, shndx, &is_ordinary);
value = lsym.get_st_value();
}
else
shndx = this->symbol_section_and_value(r_sym, &value,
&is_ordinary);
this->set_opd_ent(reloc.get_r_offset(), shndx,
value + reloc.get_r_addend());
}
}
}
}
template<int size, bool big_endian>
void
Powerpc_relobj<size, big_endian>::do_read_relocs(Read_relocs_data* rd)
{
Sized_relobj_file<size, big_endian>::do_read_relocs(rd);
if (size == 64)
{
for (Read_relocs_data::Relocs_list::iterator p = rd->relocs.begin();
p != rd->relocs.end();
++p)
{
if (p->data_shndx == this->opd_shndx())
{
this->init_opd(this->section_size(this->opd_shndx()));
this->scan_opd_relocs(p->reloc_count, p->contents->data(),
rd->local_symbols->data());
break;
}
}
}
}
// Set up PowerPC target specific relobj.
template<int size, bool big_endian>
@ -745,21 +853,20 @@ Target_powerpc<size, big_endian>::do_make_elf_object(
if (et == elfcpp::ET_REL)
{
Powerpc_relobj<size, big_endian>* obj =
new Powerpc_relobj<size, big_endian>(name, input_file, offset, ehdr);
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);
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);
gold_error(_("%s: unsupported ELF file type %d"), name.c_str(), et);
return NULL;
}
}
@ -1013,45 +1120,48 @@ Output_data_plt_powerpc<size, big_endian>::add_entry(Symbol* gsym)
}
}
static const uint32_t addis_11_11 = 0x3d6b0000;
static const uint32_t addis_11_30 = 0x3d7e0000;
static const uint32_t addis_12_12 = 0x3d8c0000;
static const uint32_t addi_11_11 = 0x396b0000;
static const uint32_t add_0_11_11 = 0x7c0b5a14;
static const uint32_t add_11_0_11 = 0x7d605a14;
static const uint32_t b = 0x48000000;
static const uint32_t bcl_20_31 = 0x429f0005;
static const uint32_t bctr = 0x4e800420;
static const uint32_t blrl = 0x4e800021;
static const uint32_t lis_11 = 0x3d600000;
static const uint32_t lis_12 = 0x3d800000;
static const uint32_t lwzu_0_12 = 0x840c0000;
static const uint32_t lwz_0_12 = 0x800c0000;
static const uint32_t lwz_11_11 = 0x816b0000;
static const uint32_t lwz_11_30 = 0x817e0000;
static const uint32_t lwz_12_12 = 0x818c0000;
static const uint32_t mflr_0 = 0x7c0802a6;
static const uint32_t mflr_12 = 0x7d8802a6;
static const uint32_t mtctr_0 = 0x7c0903a6;
static const uint32_t mtctr_11 = 0x7d6903a6;
static const uint32_t mtlr_0 = 0x7c0803a6;
static const uint32_t nop = 0x60000000;
static const uint32_t sub_11_11_12 = 0x7d6c5850;
static const uint32_t addis_12_2 = 0x3d820000;
static const uint32_t std_2_1 = 0xf8410000;
static const uint32_t ld_11_12 = 0xe96c0000;
static const uint32_t ld_2_12 = 0xe84c0000;
static const uint32_t addi_12_12 = 0x398c0000;
static const uint32_t ld_11_2 = 0xe9620000;
static const uint32_t addi_2_2 = 0x38420000;
static const uint32_t ld_2_2 = 0xe8420000;
static const uint32_t mflr_11 = 0x7d6802a6;
static const uint32_t ld_2_11 = 0xe84b0000;
static const uint32_t mtlr_12 = 0x7d8803a6;
static const uint32_t add_12_2_11 = 0x7d825a14;
static const uint32_t li_0_0 = 0x38000000;
static const uint32_t lis_0_0 = 0x3c000000;
static const uint32_t ori_0_0_0 = 0x60000000;
static const uint32_t addis_11_11 = 0x3d6b0000;
static const uint32_t addis_11_30 = 0x3d7e0000;
static const uint32_t addis_12_12 = 0x3d8c0000;
static const uint32_t addi_11_11 = 0x396b0000;
static const uint32_t add_0_11_11 = 0x7c0b5a14;
static const uint32_t add_11_0_11 = 0x7d605a14;
static const uint32_t b = 0x48000000;
static const uint32_t bcl_20_31 = 0x429f0005;
static const uint32_t bctr = 0x4e800420;
static const uint32_t blrl = 0x4e800021;
static const uint32_t lis_11 = 0x3d600000;
static const uint32_t lis_12 = 0x3d800000;
static const uint32_t lwzu_0_12 = 0x840c0000;
static const uint32_t lwz_0_12 = 0x800c0000;
static const uint32_t lwz_11_11 = 0x816b0000;
static const uint32_t lwz_11_30 = 0x817e0000;
static const uint32_t lwz_12_12 = 0x818c0000;
static const uint32_t mflr_0 = 0x7c0802a6;
static const uint32_t mflr_12 = 0x7d8802a6;
static const uint32_t mtctr_0 = 0x7c0903a6;
static const uint32_t mtctr_11 = 0x7d6903a6;
static const uint32_t mtlr_0 = 0x7c0803a6;
static const uint32_t nop = 0x60000000;
static const uint32_t sub_11_11_12 = 0x7d6c5850;
static const uint32_t addis_12_2 = 0x3d820000;
static const uint32_t std_2_1 = 0xf8410000;
static const uint32_t ld_2_1 = 0xe8410000;
static const uint32_t ld_11_12 = 0xe96c0000;
static const uint32_t ld_2_12 = 0xe84c0000;
static const uint32_t addi_12_12 = 0x398c0000;
static const uint32_t ld_11_2 = 0xe9620000;
static const uint32_t addi_2_2 = 0x38420000;
static const uint32_t ld_2_2 = 0xe8420000;
static const uint32_t mflr_11 = 0x7d6802a6;
static const uint32_t ld_2_11 = 0xe84b0000;
static const uint32_t mtlr_12 = 0x7d8803a6;
static const uint32_t add_12_2_11 = 0x7d825a14;
static const uint32_t li_0_0 = 0x38000000;
static const uint32_t lis_0_0 = 0x3c000000;
static const uint32_t ori_0_0_0 = 0x60000000;
static const uint32_t cror_15_15_15 = 0x4def7b82;
static const uint32_t cror_31_31_31 = 0x4ffffb82;
// Write out the PLT.
@ -1121,6 +1231,8 @@ template<int size, bool big_endian>
class Output_data_glink : public Output_section_data
{
public:
static const int pltresolve_size = 16*4;
Output_data_glink(Target_powerpc<size, big_endian>*);
// Add an entry
@ -1156,8 +1268,6 @@ class Output_data_glink : public Output_section_data
{ mapfile->print_output_data(this, _("** glink")); }
private:
static const int pltresolve_size = 16*4;
void
set_final_data_size();
@ -1171,7 +1281,7 @@ class Output_data_glink : public Output_section_data
Glink_sym_ent(const Symbol* sym,
const elfcpp::Rela<size, big_endian>& reloc,
const Sized_relobj<size, big_endian>* object)
: sym_(sym), object_(0), addend_(0)
: sym_(sym), addend_(0), object_(0)
{
if (size != 32)
this->addend_ = reloc.get_r_addend();
@ -1185,16 +1295,16 @@ class Output_data_glink : public Output_section_data
}
}
const Symbol* sym_;
const Sized_relobj<size, big_endian>* object_;
unsigned int addend_;
bool operator==(const Glink_sym_ent& that) const
{
return (this->sym_ == that.sym_
&& this->object_ == that.object_
&& this->addend_ == that.addend_);
}
const Symbol* sym_;
unsigned int addend_;
const Sized_relobj<size, big_endian>* object_;
};
class Glink_sym_ent_hash
@ -1314,7 +1424,7 @@ ha(uint32_t a)
template<bool big_endian>
static inline void
write_insn(unsigned char *p, uint32_t v)
write_insn(unsigned char* p, uint32_t v)
{
elfcpp::Swap<32, big_endian>::writeval(p, v);
}
@ -1329,19 +1439,21 @@ Output_data_glink<size, big_endian>::do_write(Output_file* of)
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;
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;
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)
{
const unsigned int toc_base_offset = 0x8000;
g_o_t = got->output_section()->address() + toc_base_offset;
// Write out call stubs.
typename Glink_entries::const_iterator g;
for (g = this->glink_entries_.begin();
@ -1423,13 +1535,15 @@ Output_data_glink<size, big_endian>::do_write(Output_file* of)
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);
uint32_t branch_off = this->pltresolve_ + 8 - (p - oview);
write_insn<big_endian>(p, b + (branch_off & 0x3fffffc)), p += 4;
indx++;
}
}
else
{
g_o_t = got->address() + got->g_o_t();
// Write out call stubs.
typename Glink_entries::const_iterator g;
for (g = this->glink_entries_.begin();
@ -1438,6 +1552,7 @@ Output_data_glink<size, big_endian>::do_write(Output_file* of)
{
uint32_t plt_addr = plt_base + g->first.sym_->plt_offset();
uint32_t got_addr;
const uint32_t invalid_address = static_cast<uint32_t>(-1);
p = oview + g->second * this->glink_entry_size();
if (parameters->options().output_is_position_independent())
@ -1447,9 +1562,10 @@ Output_data_glink<size, big_endian>::do_write(Output_file* of)
if (object != NULL)
{
unsigned int got2 = object->got2_shndx();
got_addr = (g->first.object_->output_section(got2)->address()
+ g->first.object_->output_section_offset(got2)
+ g->first.addend_);
got_addr = g->first.object_->get_output_section_offset(got2);
gold_assert(got_addr != invalid_address);
got_addr += (g->first.object_->output_section(got2)->address()
+ g->first.addend_);
}
else
got_addr = g_o_t;
@ -1481,7 +1597,7 @@ Output_data_glink<size, big_endian>::do_write(Output_file* of)
// 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;
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)
@ -1852,8 +1968,10 @@ Target_powerpc<size, big_endian>::Scan::local(
case elfcpp::R_PPC64_ADDR64:
case elfcpp::R_POWERPC_ADDR32:
case elfcpp::R_POWERPC_ADDR16_HA:
case elfcpp::R_POWERPC_ADDR16:
case elfcpp::R_POWERPC_ADDR16_LO:
case elfcpp::R_POWERPC_ADDR16_HI:
case elfcpp::R_POWERPC_ADDR16_HA:
// If building a shared library (or a position-independent
// executable), we need to create a dynamic relocation for
// this location.
@ -1893,8 +2011,8 @@ Target_powerpc<size, big_endian>::Scan::local(
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;
// The symbol requires a GOT entry.
Output_data_got_powerpc<size, big_endian>* got;
unsigned int r_sym;
got = target->got_section(symtab, layout);
@ -1985,16 +2103,16 @@ Target_powerpc<size, big_endian>::Scan::global(
case elfcpp::R_PPC_LOCAL24PC:
break;
case elfcpp::R_PPC64_ADDR64:
case elfcpp::R_POWERPC_ADDR32:
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())
{
// 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
@ -2003,16 +2121,16 @@ Target_powerpc<size, big_endian>::Scan::global(
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
}
// 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))
{
@ -2086,8 +2204,8 @@ Target_powerpc<size, big_endian>::Scan::global(
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;
// 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())
@ -2261,13 +2379,21 @@ Target_powerpc<size, big_endian>::do_finalize_sections(
layout->add_target_dynamic_tags(false, this->plt_, rel_plt,
this->rela_dyn_, true, size == 32);
Output_data_dynamic* odyn = layout->dynamic_data();
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());
}
else
{
this->glink_->finalize_data_size();
odyn->add_section_plus_offset(elfcpp::DT_PPC64_GLINK,
this->glink_,
(this->glink_->pltresolve()
+ this->glink_->pltresolve_size - 32));
}
// Emit any relocs we saved in an attempt to avoid generating COPY
// relocs.
@ -2289,14 +2415,14 @@ Target_powerpc<size, big_endian>::Relocate::relocate(
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 */)
Address 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;
Address value;
if (r_type == elfcpp::R_POWERPC_GOT16
|| r_type == elfcpp::R_POWERPC_GOT16_LO
@ -2320,7 +2446,8 @@ Target_powerpc<size, big_endian>::Relocate::relocate(
}
else if (r_type == elfcpp::R_PPC64_TOC)
{
value = target->got_section()->address() + toc_base_offset;
value = (target->got_section()->output_section()->address()
+ toc_base_offset);
}
else if (gsym != NULL
&& (r_type == elfcpp::R_POWERPC_REL24
@ -2332,13 +2459,54 @@ Target_powerpc<size, big_endian>::Relocate::relocate(
glink = target->glink_section();
unsigned int glink_index = glink->find_entry(gsym, rela, object);
value = glink->address() + glink_index * glink->glink_entry_size();
if (size == 64)
{
typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
Valtype* wv = reinterpret_cast<Valtype*>(view);
bool can_plt_call = false;
if (rela.get_r_offset() + 8 <= view_size)
{
Valtype insn2 = elfcpp::Swap<32, big_endian>::readval(wv + 1);
if (insn2 == nop
|| insn2 == cror_15_15_15 || insn2 == cror_31_31_31)
{
elfcpp::Swap<32, big_endian>::writeval(wv + 1, ld_2_1 + 40);
can_plt_call = true;
}
}
if (!can_plt_call)
gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
_("call lacks nop, can't restore toc"));
}
}
else
{
elfcpp::Elf_Xword addend = 0;
typename elfcpp::Elf_types<size>::Elf_Swxword addend = 0;
if (r_type != elfcpp::R_PPC_PLTREL24)
addend = rela.get_r_addend();
value = psymval->value(object, addend);
if (size == 64 && this->is_branch_reloc(r_type))
{
Powerpc_relobj<size, big_endian>* symobj = const_cast
<Powerpc_relobj<size, big_endian>*>(object);
if (gsym != NULL)
symobj = static_cast
<Powerpc_relobj<size, big_endian>*>(gsym->object());
unsigned int shndx = symobj->opd_shndx();
Address opd_addr = symobj->get_output_section_offset(shndx);
gold_assert(opd_addr != invalid_address);
opd_addr += symobj->output_section(shndx)->address();
if (value >= opd_addr
&& value < opd_addr + symobj->section_size(shndx))
{
Address sec_off;
symobj->get_opd_ent(value - opd_addr, &shndx, &sec_off);
Address sec_addr = symobj->get_output_section_offset(shndx);
gold_assert(sec_addr != invalid_address);
sec_addr += symobj->output_section(shndx)->address();
value = sec_addr + sec_off;
}
}
}
switch (r_type)
@ -2350,7 +2518,8 @@ Target_powerpc<size, big_endian>::Relocate::relocate(
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;
value -= (target->got_section()->output_section()->address()
+ toc_base_offset);
break;
case elfcpp::R_POWERPC_SECTOFF:
@ -2487,14 +2656,14 @@ Target_powerpc<size, big_endian>::Relocate::relocate_tls(
const Sized_symbol<size>* gsym,
const Symbol_value<size>* psymval,
unsigned char* view,
typename elfcpp::Elf_types<size>::Elf_Addr address,
Address 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 Address addend = rela.get_r_addend();
Address value = psymval->value(object, 0);
const bool is_final =
(gsym == NULL
@ -2519,7 +2688,7 @@ Target_powerpc<size, big_endian>::relocate_section(
Output_section* output_section,
bool needs_special_offset_handling,
unsigned char* view,
typename elfcpp::Elf_types<size>::Elf_Addr address,
Address address,
section_size_type view_size,
const Reloc_symbol_changes* reloc_symbol_changes)
{
@ -2622,29 +2791,30 @@ Target_powerpc<size, big_endian>::relocate_for_relocatable(
off_t offset_in_output_section,
const Relocatable_relocs* rr,
unsigned char*,
typename elfcpp::Elf_types<size>::Elf_Addr,
Address,
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;
Address got2_addend = 0;
if (got2_shndx != 0)
got2_addend = object->get_output_section_offset(got2_shndx);
{
got2_addend = object->get_output_section_offset(got2_shndx);
gold_assert(got2_addend != invalid_address);
}
unsigned char* pwrite = reloc_view;
@ -2716,13 +2886,13 @@ Target_powerpc<size, big_endian>::relocate_for_relocatable(
new_offset = offset + offset_in_output_section;
else
{
section_offset_type sot_offset =
convert_types<section_offset_type, Address>(offset);
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);
output_section->output_offset(object, relinfo->data_shndx,
sot_offset);
gold_assert(new_sot_offset != -1);
new_offset = new_sot_offset;
new_offset = new_sot_offset;
}
reloc_write.put_r_offset(new_offset);

2
gold/symtab.h
View File

@ -62,7 +62,7 @@ class Garbage_collection;
class Icf;
// The base class of an entry in the symbol table. The symbol table
// can have a lot of entries, so we don't want this class to big.
// can have a lot of entries, so we don't want this class too big.
// Size dependent fields can be found in the template class
// Sized_symbol. Targets may support their own derived classes.