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From Craig Silverstein: add LD to LE TLS optimizations.

This commit is contained in:
Ian Lance Taylor 2007-10-15 03:39:16 +00:00
parent 5ffcaa866f
commit 72ec287661
1 changed files with 53 additions and 52 deletions
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105
gold/x86_64.cc
View File

@ -192,15 +192,14 @@ class Target_x86_64 : public Sized_target<64, false>
unsigned char* view,
off_t view_size);
// Check the range for a TLS relocation.
static inline void
check_range(const Relocate_info<64, false>*, size_t relnum,
const elfcpp::Rela<64, false>&, off_t, off_t);
// Check the validity of a TLS relocation. This is like assert.
static inline void
check_tls(const Relocate_info<64, false>*, size_t relnum,
const elfcpp::Rela<64, false>&, bool);
// Do a TLS Local-Dynamic to Local-Exec transition.
inline void
tls_ld_to_le(const Relocate_info<64, false>*, size_t relnum,
Output_segment* tls_segment,
const elfcpp::Rela<64, false>&, unsigned int r_type,
elfcpp::Elf_types<64>::Elf_Addr value,
unsigned char* view,
off_t view_size);
// This is set if we should skip the next reloc, which should be a
// PLT32 reloc against ___tls_get_addr.
@ -572,7 +571,7 @@ Target_x86_64::copy_reloc(const General_options* options,
Layout* layout,
Sized_relobj<64, false>* object,
unsigned int data_shndx, Symbol* gsym,
const elfcpp::Rela<64, false>& rel)
const elfcpp::Rela<64, false>& rela)
{
Sized_symbol<64>* ssym;
ssym = symtab->get_sized_symbol SELECT_SIZE_NAME(64) (gsym
@ -586,7 +585,7 @@ Target_x86_64::copy_reloc(const General_options* options,
// symbol, then we will emit the relocation.
if (this->copy_relocs_ == NULL)
this->copy_relocs_ = new Copy_relocs<64, false>();
this->copy_relocs_->save(ssym, object, data_shndx, rel);
this->copy_relocs_->save(ssym, object, data_shndx, rela);
}
else
{
@ -1347,7 +1346,7 @@ Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo,
inline void
Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>* relinfo,
size_t relnum,
const elfcpp::Rela<64, false>& rel,
const elfcpp::Rela<64, false>& rela,
unsigned int r_type,
const Sized_symbol<64>* gsym,
const Symbol_value<64>* psymval,
@ -1358,7 +1357,7 @@ Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>* relinfo,
Output_segment* tls_segment = relinfo->layout->tls_segment();
if (tls_segment == NULL)
{
gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
_("TLS reloc but no TLS segment"));
return;
}
@ -1381,11 +1380,11 @@ Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>* relinfo,
if (optimized_type == tls::TLSOPT_TO_LE)
{
Target_x86_64::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment,
rel, r_type, value, view,
rela, r_type, value, view,
view_size);
break;
}
gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
_("unsupported reloc type %u"),
r_type);
break;
@ -1396,20 +1395,22 @@ Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>* relinfo,
if (optimized_type == tls::TLSOPT_TO_LE)
{
this->tls_gd_to_le(relinfo, relnum, tls_segment,
rel, r_type, value, view,
rela, r_type, value, view,
view_size);
break;
}
gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
_("unsupported reloc %u"), r_type);
break;
case elfcpp::R_X86_64_TLSLD:
if (optimized_type == tls::TLSOPT_TO_LE)
{
// FIXME: implement ld_to_le
this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type,
value, view, view_size);
break;
}
gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
_("unsupported reloc %u"), r_type);
break;
@ -1438,7 +1439,7 @@ inline void
Target_x86_64::Relocate::tls_ie_to_le(const Relocate_info<64, false>* relinfo,
size_t relnum,
Output_segment* tls_segment,
const elfcpp::Rela<64, false>& rel,
const elfcpp::Rela<64, false>& rela,
unsigned int,
elfcpp::Elf_types<64>::Elf_Addr value,
unsigned char* view,
@ -1450,8 +1451,8 @@ Target_x86_64::Relocate::tls_ie_to_le(const Relocate_info<64, false>* relinfo,
// movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg
// addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg
Target_x86_64::Relocate::check_range(relinfo, relnum, rel, view_size, -3);
Target_x86_64::Relocate::check_range(relinfo, relnum, rel, view_size, 4);
tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
unsigned char op1 = view[-3];
unsigned char op2 = view[-2];
@ -1494,7 +1495,7 @@ inline void
Target_x86_64::Relocate::tls_gd_to_le(const Relocate_info<64, false>* relinfo,
size_t relnum,
Output_segment* tls_segment,
const elfcpp::Rela<64, false>& rel,
const elfcpp::Rela<64, false>& rela,
unsigned int,
elfcpp::Elf_types<64>::Elf_Addr value,
unsigned char* view,
@ -1504,15 +1505,13 @@ Target_x86_64::Relocate::tls_gd_to_le(const Relocate_info<64, false>* relinfo,
// .word 0x6666; rex64; call __tls_get_addr
// ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax
Target_x86_64::Relocate::check_range(relinfo, relnum, rel, view_size, -4);
Target_x86_64::Relocate::check_range(relinfo, relnum, rel, view_size, 12);
tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4);
tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12);
Target_x86_64::Relocate::check_tls(relinfo, relnum, rel,
(memcmp(view - 4, "\x66\x48\x8d\x3d", 4)
== 0));
Target_x86_64::Relocate::check_tls(relinfo, relnum, rel,
(memcmp(view + 4, "\x66\x66\x48\xe8", 4)
== 0));
tls::check_tls(relinfo, relnum, rela.get_r_offset(),
(memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0));
tls::check_tls(relinfo, relnum, rela.get_r_offset(),
(memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0));
memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", 16);
@ -1524,31 +1523,33 @@ Target_x86_64::Relocate::tls_gd_to_le(const Relocate_info<64, false>* relinfo,
this->skip_call_tls_get_addr_ = true;
}
// Check the range for a TLS relocation.
inline void
Target_x86_64::Relocate::check_range(const Relocate_info<64, false>* relinfo,
size_t relnum,
const elfcpp::Rela<64, false>& rel,
off_t view_size, off_t off)
Target_x86_64::Relocate::tls_ld_to_le(const Relocate_info<64, false>* relinfo,
size_t relnum,
Output_segment*,
const elfcpp::Rela<64, false>& rela,
unsigned int,
elfcpp::Elf_types<64>::Elf_Addr,
unsigned char* view,
off_t view_size)
{
off_t offset = rel.get_r_offset() + off;
if (offset < 0 || offset > view_size)
gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
_("TLS relocation out of range"));
}
// leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt;
// ... leq foo@dtpoff(%rax),%reg
// ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx
// Check the validity of a TLS relocation. This is like assert.
tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9);
inline void
Target_x86_64::Relocate::check_tls(const Relocate_info<64, false>* relinfo,
size_t relnum,
const elfcpp::Rela<64, false>& rel,
bool valid)
{
if (!valid)
gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
_("TLS relocation against invalid instruction"));
tls::check_tls(relinfo, relnum, rela.get_r_offset(),
view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d);
tls::check_tls(relinfo, relnum, rela.get_r_offset(), view[4] == 0xe8);
memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12);
// The next reloc should be a PLT32 reloc against __tls_get_addr.
// We can skip it.
this->skip_call_tls_get_addr_ = true;
}
// Relocate section data.