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From Craig Silverstein: x86_64 TLS support.

Browse Source
This commit is contained in:
Ian Lance Taylor
2007-10-04 22:28:36 +00:00
parent 0eadd5b433
commit d61c17ea24
2 changed files with 179 additions and 284 deletions
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15
gold/i386.cc
View File

@ -741,6 +741,8 @@ Target_i386::Scan::local(const General_options&,
case elfcpp::R_386_GLOB_DAT:
case elfcpp::R_386_JUMP_SLOT:
case elfcpp::R_386_RELATIVE:
// These are outstanding tls relocs, which are unexpected when
// linking.
case elfcpp::R_386_TLS_TPOFF:
case elfcpp::R_386_TLS_DTPMOD32:
case elfcpp::R_386_TLS_DTPOFF32:
@ -751,6 +753,8 @@ Target_i386::Scan::local(const General_options&,
gold_exit(false);
break;
// These are initial tls relocs, which are expected when
// linking.
case elfcpp::R_386_TLS_IE:
case elfcpp::R_386_TLS_GOTIE:
case elfcpp::R_386_TLS_LE:
@ -902,6 +906,8 @@ Target_i386::Scan::global(const General_options& options,
case elfcpp::R_386_GLOB_DAT:
case elfcpp::R_386_JUMP_SLOT:
case elfcpp::R_386_RELATIVE:
// These are outstanding tls relocs, which are unexpected when
// linking.
case elfcpp::R_386_TLS_TPOFF:
case elfcpp::R_386_TLS_DTPMOD32:
case elfcpp::R_386_TLS_DTPOFF32:
@ -912,6 +918,8 @@ Target_i386::Scan::global(const General_options& options,
gold_exit(false);
break;
// These are initial tls relocs, which are expected when
// linking.
case elfcpp::R_386_TLS_IE:
case elfcpp::R_386_TLS_GOTIE:
case elfcpp::R_386_TLS_LE:
@ -1164,6 +1172,8 @@ Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo,
case elfcpp::R_386_GLOB_DAT:
case elfcpp::R_386_JUMP_SLOT:
case elfcpp::R_386_RELATIVE:
// These are outstanding tls relocs, which are unexpected when
// linking.
case elfcpp::R_386_TLS_TPOFF:
case elfcpp::R_386_TLS_DTPMOD32:
case elfcpp::R_386_TLS_DTPOFF32:
@ -1176,6 +1186,8 @@ Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo,
gold_exit(false);
break;
// These are initial tls relocs, which are expected when
// linking.
case elfcpp::R_386_TLS_IE:
case elfcpp::R_386_TLS_GOTIE:
case elfcpp::R_386_TLS_LE:
@ -1440,7 +1452,8 @@ Target_i386::Relocate::tls_gd_to_le(const Relocate_info<32, false>* relinfo,
{
Target_i386::Relocate::check_tls(relinfo, relnum, rel,
(op1 & 0xf8) == 0x80 && (op1 & 7) != 4);
if (rel.get_r_offset() + 9 < view_size && view[9] == 0x90)
if (static_cast<off_t>(rel.get_r_offset() + 9) < view_size
&& view[9] == 0x90)
{
// There is a trailing nop. Use the size byte subl.
memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);

284
gold/x86_64.cc
View File

@ -53,7 +53,11 @@ using namespace gold;
class Output_data_plt_x86_64;
// The x86_64 target class.
// See the ABI at http://www.x86-64.org/documentation/abi.pdf
// See the ABI at
// http://www.x86-64.org/documentation/abi.pdf
// TLS info comes from
// http://people.redhat.com/drepper/tls.pdf
// http://ia32-abi.googlegroups.com/web/RFC-TLSDESC-x86.txt?gda=kWQJPEQAAACEfYQFX0dubPQ2NuO4whhjkR4HAp8tBMb_I0iuUeQslmG1qiJ7UbTIup-M2XPURDRiZJyPR4BqKR2agJ-5jfT5Ley2_-oiOJ4zLNAGCw24Bg
class Target_x86_64 : public Sized_target<64, false>
{
@ -621,7 +625,6 @@ Target_x86_64::copy_reloc(const General_options* options,
// Add the COPY reloc.
ssym->set_needs_dynsym_entry();
Reloc_section* rel_dyn = this->rel_dyn_section(layout);
// TODO(csilvers): should last arg here be rel.get_r_addend?
rel_dyn->add_global(ssym, elfcpp::R_X86_64_COPY, dynbss, offset, 0);
}
}
@ -634,8 +637,6 @@ Target_x86_64::copy_reloc(const General_options* options,
unsigned int
Target_x86_64::optimize_tls_reloc(bool is_final, int r_type)
{
return is_final ? r_type : 0;
#if 0
// If we are generating a shared library, then we can't do anything
// in the linker.
if (parameters->output_is_shared())
@ -644,37 +645,32 @@ Target_x86_64::optimize_tls_reloc(bool is_final, int r_type)
switch (r_type)
{
case elfcpp::R_X86_64_TLSGD:
case elfcpp::R_X86_64_GOTPC32_TLSDESC: // TODO(csilvers): correct?
case elfcpp::R_X86_64_TLSDESC_CALL: // TODO(csilvers): correct?
// These are Global-Dynamic which permits fully general TLS
// access. Since we know that we are generating an executable,
// we can convert this to Initial-Exec. If we also know that
// this is a local symbol, we can further switch to Local-Exec.
if (is_final)
return elfcpp::R_X86_64_TLS_LE_64;
return elfcpp::R_X86_64_TLS_IE_64;
return elfcpp::R_X86_64_TPOFF32;
return elfcpp::R_X86_64_GOTTPOFF; // used for Initial-exec
case elfcpp::R_X86_64_TLS_LDM:
case elfcpp::R_X86_64_TLSLD:
// This is Local-Dynamic, which refers to a local symbol in the
// dynamic TLS block. Since we know that we generating an
// executable, we can switch to Local-Exec.
return elfcpp::R_X86_64_TLS_LE_64;
return elfcpp::R_X86_64_TPOFF32;
case elfcpp::R_X86_64_TLS_LDO_64:
// Another type of Local-Dynamic relocation.
return elfcpp::R_X86_64_TLS_LE;
case elfcpp::R_X86_64_TLS_IE:
case elfcpp::R_X86_64_TLS_GOTIE:
case elfcpp::R_X86_64_TLS_IE_64:
case elfcpp::R_X86_64_GOTTPOFF:
// These are Initial-Exec relocs which get the thread offset
// from the GOT. If we know that we are linking against the
// local symbol, we can switch to Local-Exec, which links the
// thread offset into the instruction.
if (is_final)
return elfcpp::R_X86_64_TLS_LE_64;
return elfcpp::R_X86_64_TPOFF32;
return r_type;
case elfcpp::R_X86_64_TLS_LE:
case elfcpp::R_X86_64_TLS_LE_64:
case elfcpp::R_X86_64_TPOFF32:
// When we already have Local-Exec, there is nothing further we
// can do.
return r_type;
@ -682,7 +678,6 @@ Target_x86_64::optimize_tls_reloc(bool is_final, int r_type)
default:
gold_unreachable();
}
#endif
}
// Scan a relocation for a local symbol.
@ -733,51 +728,40 @@ Target_x86_64::Scan::local(const General_options&,
case elfcpp::R_X86_64_GLOB_DAT:
case elfcpp::R_X86_64_JUMP_SLOT:
case elfcpp::R_X86_64_RELATIVE:
// These are outstanding tls relocs, which are unexpected when linking
case elfcpp::R_X86_64_TPOFF64:
case elfcpp::R_X86_64_TPOFF32:
case elfcpp::R_X86_64_DTPMOD64:
case elfcpp::R_X86_64_DTPOFF64:
case elfcpp::R_X86_64_DTPOFF32:
case elfcpp::R_X86_64_GOTTPOFF: // TODO(csilvers): correct?
case elfcpp::R_X86_64_TLSDESC:
case elfcpp::R_X86_64_GOTPC32_TLSDESC: // TODO(csilvers): correct?
case elfcpp::R_X86_64_TLSDESC_CALL: // TODO(csilvers): correct?
fprintf(stderr, _("%s: %s: unexpected reloc %u in object file\n"),
program_name, object->name().c_str(), r_type);
gold_exit(false);
break;
#if 0
// These are initial tls relocs, which are expected when linking
case elfcpp::R_X86_64_TLSGD: // TODO(csilvers): correct?
case elfcpp::R_X86_64_TLSLD: // TODO(csilvers): correct?
case elfcpp::R_386_TLS_IE:
case elfcpp::R_386_TLS_GOTIE:
case elfcpp::R_386_TLS_LE:
case elfcpp::R_386_TLS_GD:
case elfcpp::R_386_TLS_LDM:
case elfcpp::R_386_TLS_LDO_64:
case elfcpp::R_386_TLS_IE_64:
case elfcpp::R_386_TLS_LE_64:
case elfcpp::R_X86_64_GOTTPOFF: // TODO(csilvers): correct?
case elfcpp::R_X86_64_TPOFF32: // TODO(csilvers): correct?
case elfcpp::R_X86_64_GOTPC32_TLSDESC: // TODO(csilvers): correct?
case elfcpp::R_X86_64_TLSDESC_CALL: // TODO(csilvers): correct?
{
bool output_is_shared = parameters->output_is_shared();
r_type = Target_x86_64::optimize_tls_reloc(!output_is_shared,
r_type);
r_type = Target_x86_64::optimize_tls_reloc(!output_is_shared, r_type);
switch (r_type)
{
case elfcpp::R_X86_64_TLS_LE:
case elfcpp::R_X86_64_TLS_LE_64:
case elfcpp::R_X86_64_TPOFF32: // Local-exec
// FIXME: If generating a shared object, we need to copy
// this relocation into the object.
gold_assert(!output_is_shared);
break;
case elfcpp::R_X86_64_TLS_IE:
case elfcpp::R_X86_64_TLS_GOTIE:
case elfcpp::R_X86_64_TLS_GD:
case elfcpp::R_X86_64_TLS_LDM:
case elfcpp::R_X86_64_TLS_LDO_64:
case elfcpp::R_X86_64_TLS_IE_64:
case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
case elfcpp::R_X86_64_TLSGD: // General Dynamic
case elfcpp::R_X86_64_TLSLD: // Local Dynamic
case elfcpp::R_X86_64_GOTPC32_TLSDESC:
case elfcpp::R_X86_64_TLSDESC_CALL:
fprintf(stderr,
_("%s: %s: unsupported reloc %u against local symbol\n"),
program_name, object->name().c_str(), r_type);
@ -785,7 +769,6 @@ Target_x86_64::Scan::local(const General_options&,
}
}
break;
#endif
case elfcpp::R_X86_64_GOT64: // TODO(csilvers): correct?
case elfcpp::R_X86_64_GOT32:
@ -795,16 +778,6 @@ Target_x86_64::Scan::local(const General_options&,
case elfcpp::R_X86_64_PLT32:
case elfcpp::R_X86_64_SIZE32: // TODO(csilvers): correct?
case elfcpp::R_X86_64_SIZE64: // TODO(csilvers): correct?
#if 0
case elfcpp::R_386_TLS_GD_64:
case elfcpp::R_386_TLS_GD_PUSH:
case elfcpp::R_386_TLS_GD_CALL:
case elfcpp::R_386_TLS_GD_POP:
case elfcpp::R_386_TLS_LDM_64:
case elfcpp::R_386_TLS_LDM_PUSH:
case elfcpp::R_386_TLS_LDM_CALL:
case elfcpp::R_386_TLS_LDM_POP:
#endif
default:
fprintf(stderr, _("%s: %s: unsupported reloc %u against local symbol\n"),
program_name, object->name().c_str(), r_type);
@ -916,50 +889,40 @@ Target_x86_64::Scan::global(const General_options& options,
case elfcpp::R_X86_64_GLOB_DAT:
case elfcpp::R_X86_64_JUMP_SLOT:
case elfcpp::R_X86_64_RELATIVE:
// These are outstanding tls relocs, which are unexpected when linking
case elfcpp::R_X86_64_TPOFF64:
case elfcpp::R_X86_64_TPOFF32:
case elfcpp::R_X86_64_DTPMOD64:
case elfcpp::R_X86_64_DTPOFF64:
case elfcpp::R_X86_64_DTPOFF32:
case elfcpp::R_X86_64_GOTTPOFF: // TODO(csilvers): correct?
case elfcpp::R_X86_64_TLSDESC:
case elfcpp::R_X86_64_GOTPC32_TLSDESC: // TODO(csilvers): correct?
case elfcpp::R_X86_64_TLSDESC_CALL: // TODO(csilvers): correct?
fprintf(stderr, _("%s: %s: unexpected reloc %u in object file\n"),
program_name, object->name().c_str(), r_type);
gold_exit(false);
break;
#if 0
// These are initial tls relocs, which are expected for global()
case elfcpp::R_X86_64_TLSGD: // TODO(csilvers): correct?
case elfcpp::R_X86_64_TLSLD: // TODO(csilvers): correct?
case elfcpp::R_386_TLS_IE:
case elfcpp::R_386_TLS_GOTIE:
case elfcpp::R_386_TLS_LE:
case elfcpp::R_386_TLS_GD:
case elfcpp::R_386_TLS_LDM:
case elfcpp::R_386_TLS_LDO_64:
case elfcpp::R_386_TLS_IE_64:
case elfcpp::R_386_TLS_LE_64:
case elfcpp::R_X86_64_GOTTPOFF: // TODO(csilvers): correct?
case elfcpp::R_X86_64_TPOFF32: // TODO(csilvers): correct?
case elfcpp::R_X86_64_GOTPC32_TLSDESC: // TODO(csilvers): correct?
case elfcpp::R_X86_64_TLSDESC_CALL: // TODO(csilvers): correct?
{
const bool is_final = gsym->final_value_is_known();
r_type = Target_x86_64::optimize_tls_reloc(is_final, r_type);
switch (r_type)
{
case elfcpp::R_386_TLS_LE:
case elfcpp::R_386_TLS_LE_64:
case elfcpp::R_X86_64_TPOFF32: // Local-exec
// FIXME: If generating a shared object, we need to copy
// this relocation into the object.
gold_assert(!parameters->output_is_shared());
break;
case elfcpp::R_386_TLS_IE:
case elfcpp::R_386_TLS_GOTIE:
case elfcpp::R_386_TLS_GD:
case elfcpp::R_386_TLS_LDM:
case elfcpp::R_386_TLS_LDO_64:
case elfcpp::R_386_TLS_IE_64:
case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
case elfcpp::R_X86_64_TLSGD: // General Dynamic
case elfcpp::R_X86_64_TLSLD: // Local Dynamic
case elfcpp::R_X86_64_GOTPC32_TLSDESC:
case elfcpp::R_X86_64_TLSDESC_CALL:
fprintf(stderr,
_("%s: %s: unsupported reloc %u "
"against global symbol %s\n"),
@ -969,20 +932,9 @@ Target_x86_64::Scan::global(const General_options& options,
}
}
break;
#endif
case elfcpp::R_X86_64_SIZE32: // TODO(csilvers): correct?
case elfcpp::R_X86_64_SIZE64: // TODO(csilvers): correct?
#if 0
case elfcpp::R_386_TLS_GD_64:
case elfcpp::R_386_TLS_GD_PUSH:
case elfcpp::R_386_TLS_GD_CALL:
case elfcpp::R_386_TLS_GD_POP:
case elfcpp::R_386_TLS_LDM_64:
case elfcpp::R_386_TLS_LDM_PUSH:
case elfcpp::R_386_TLS_LDM_CALL:
case elfcpp::R_386_TLS_LDM_POP:
#endif
default:
fprintf(stderr,
_("%s: %s: unsupported reloc %u against global symbol %s\n"),
@ -1254,15 +1206,12 @@ Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo,
case elfcpp::R_X86_64_GLOB_DAT:
case elfcpp::R_X86_64_JUMP_SLOT:
case elfcpp::R_X86_64_RELATIVE:
// These are outstanding tls relocs, which are unexpected when linking
case elfcpp::R_X86_64_TPOFF64:
case elfcpp::R_X86_64_TPOFF32:
case elfcpp::R_X86_64_DTPMOD64:
case elfcpp::R_X86_64_DTPOFF64:
case elfcpp::R_X86_64_DTPOFF32:
case elfcpp::R_X86_64_GOTTPOFF: // TODO(csilvers): correct?
case elfcpp::R_X86_64_TLSDESC:
case elfcpp::R_X86_64_GOTPC32_TLSDESC: // TODO(csilvers): correct?
case elfcpp::R_X86_64_TLSDESC_CALL: // TODO(csilvers): correct?
fprintf(stderr, _("%s: %s: unexpected reloc %u in object file\n"),
program_name,
relinfo->location(relnum, rel.get_r_offset()).c_str(),
@ -1270,38 +1219,20 @@ Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo,
gold_exit(false);
break;
#if 0
// These are initial tls relocs, which are expected when linking
case elfcpp::R_X86_64_TLSGD: // TODO(csilvers): correct?
case elfcpp::R_X86_64_TLSLD: // TODO(csilvers): correct?
case elfcpp::R_386_TLS_IE:
case elfcpp::R_386_TLS_GOTIE:
case elfcpp::R_386_TLS_LE:
case elfcpp::R_386_TLS_GD:
case elfcpp::R_386_TLS_LDM:
case elfcpp::R_386_TLS_LDO_64:
case elfcpp::R_386_TLS_IE_64:
case elfcpp::R_386_TLS_LE_64:
case elfcpp::R_X86_64_GOTTPOFF: // TODO(csilvers): correct?
case elfcpp::R_X86_64_TPOFF32: // TODO(csilvers): correct?
case elfcpp::R_X86_64_GOTPC32_TLSDESC: // TODO(csilvers): correct?
case elfcpp::R_X86_64_TLSDESC_CALL: // TODO(csilvers): correct?
this->relocate_tls(relinfo, relnum, rel, r_type, gsym, psymval, view,
address, view_size);
break;
#else
view_size++; // this is to make view_size used
#endif
case elfcpp::R_X86_64_SIZE32: // TODO(csilvers): correct?
case elfcpp::R_X86_64_SIZE64: // TODO(csilvers): correct?
case elfcpp::R_X86_64_PLTOFF64: // TODO(csilvers): implement me!
#if 0
case elfcpp::R_386_TLS_GD_64:
case elfcpp::R_386_TLS_GD_PUSH:
case elfcpp::R_386_TLS_GD_CALL:
case elfcpp::R_386_TLS_GD_POP:
case elfcpp::R_386_TLS_LDM_64:
case elfcpp::R_386_TLS_LDM_PUSH:
case elfcpp::R_386_TLS_LDM_CALL:
case elfcpp::R_386_TLS_LDM_POP:
#endif
default:
fprintf(stderr, _("%s: %s: unsupported reloc %u\n"),
program_name,
@ -1317,17 +1248,16 @@ Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo,
// Perform a TLS relocation.
inline void
Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>*, // relinfo,
size_t , // relnum,
const elfcpp::Rela<64, false>& , // rel,
unsigned int , // r_type,
const Sized_symbol<64>* , // gsym,
const Symbol_value<64>* , // psymval,
unsigned char* , // view,
Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>* relinfo,
size_t relnum,
const elfcpp::Rela<64, false>& rel,
unsigned int r_type,
const Sized_symbol<64>* gsym,
const Symbol_value<64>* psymval,
unsigned char* view,
elfcpp::Elf_types<64>::Elf_Addr,
off_t)// view_size)
off_t view_size)
{
#if 0
Output_segment* tls_segment = relinfo->layout->tls_segment();
if (tls_segment == NULL)
{
@ -1346,20 +1276,13 @@ Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>*, // relinf
Target_x86_64::optimize_tls_reloc(is_final, r_type);
switch (r_type)
{
case elfcpp::R_X86_64_TLS_LE_64:
value = tls_segment->vaddr() + tls_segment->memsz() - value;
Relocate_functions<64, false>::rel64(view, value);
break;
case elfcpp::R_X86_64_TLS_LE:
case elfcpp::R_X86_64_TPOFF32: // Local-exec reloc
value = value - (tls_segment->vaddr() + tls_segment->memsz());
Relocate_functions<64, false>::rel64(view, value);
Relocate_functions<64, false>::rel32(view, value);
break;
case elfcpp::R_X86_64_TLS_IE:
case elfcpp::R_X86_64_TLS_GOTIE:
case elfcpp::R_X86_64_TLS_IE_64:
if (opt_r_type == elfcpp::R_X86_64_TLS_LE_64)
case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec reloc
if (opt_r_type == elfcpp::R_X86_64_TPOFF32)
{
Target_x86_64::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment,
rel, r_type, value, view,
@ -1373,8 +1296,8 @@ Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>*, // relinf
// gold_exit(false);
break;
case elfcpp::R_X86_64_TLS_GD:
if (opt_r_type == elfcpp::R_X86_64_TLS_LE_64)
case elfcpp::R_X86_64_TLSGD:
if (opt_r_type == elfcpp::R_X86_64_TPOFF32)
{
this->tls_gd_to_le(relinfo, relnum, tls_segment,
rel, r_type, value, view,
@ -1388,8 +1311,7 @@ Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>*, // relinf
// gold_exit(false);
break;
case elfcpp::R_X86_64_TLS_LDM:
case elfcpp::R_X86_64_TLS_LDO_64:
case elfcpp::R_X86_64_TLSLD:
fprintf(stderr, _("%s: %s: unsupported reloc %u\n"),
program_name,
relinfo->location(relnum, rel.get_r_offset()).c_str(),
@ -1397,28 +1319,26 @@ Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>*, // relinf
// gold_exit(false);
break;
}
#endif
}
// Do a relocation in which we convert a TLS Initial-Exec to a
// Local-Exec.
// TODO(csilvers): verify this is right.
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,
unsigned int , // r_type,
elfcpp::Elf_types<64>::Elf_Addr , // value,
unsigned char* , // view,
off_t) // view_size)
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,
unsigned int,
elfcpp::Elf_types<64>::Elf_Addr value,
unsigned char* view,
off_t view_size)
{
#if 0
// We have to actually change the instructions, which means that we
// need to examine the opcodes to figure out which instruction we
// are looking at.
if (r_type == elfcpp::R_X86_64_TLS_IE)
{
// movl %gs:XX,%eax ==> movl $YY,%eax
// movl %gs:XX,%reg ==> movl $YY,%reg
// addl %gs:XX,%reg ==> addl $YY,%reg
@ -1456,63 +1376,25 @@ Target_x86_64::Relocate::tls_ie_to_le(const Relocate_info<64, false>* , // relin
else
Target_x86_64::Relocate::check_tls(relinfo, relnum, rel, 0);
}
}
else
{
// subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2
// movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2
// addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2
Target_x86_64::Relocate::check_range(relinfo, relnum, rel, view_size, -2);
Target_x86_64::Relocate::check_range(relinfo, relnum, rel, view_size, 4);
unsigned char op1 = view[-1];
unsigned char op2 = view[-2];
Target_x86_64::Relocate::check_tls(relinfo, relnum, rel,
(op1 & 0xc0) == 0x80 && (op1 & 7) != 4);
if (op2 == 0x8b)
{
// movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2
view[-2] = 0xc7;
view[-1] = 0xc0 | ((op1 >> 3) & 7);
}
else if (op2 == 0x2b)
{
// subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2
view[-2] = 0x81;
view[-1] = 0xe8 | ((op1 >> 3) & 7);
}
else if (op2 == 0x03)
{
// addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2
view[-2] = 0x81;
view[-1] = 0xc0 | ((op1 >> 3) & 7);
}
else
Target_x86_64::Relocate::check_tls(relinfo, relnum, rel, 0);
}
value = tls_segment->vaddr() + tls_segment->memsz() - value;
if (r_type == elfcpp::R_X86_64_TLS_IE || r_type == elfcpp::R_X86_64_TLS_GOTIE)
value = - value;
Relocate_functions<64, false>::rel64(view, value);
#endif
value = value - (tls_segment->vaddr() + tls_segment->memsz());
Relocate_functions<64, false>::rel32(view, value);
}
// Do a relocation in which we convert a TLS Global-Dynamic to a
// Local-Exec.
// TODO(csilvers): verify this is right.
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,
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,
unsigned int,
elfcpp::Elf_types<64>::Elf_Addr , // value,
unsigned char* , // view,
off_t)// view_size)
elfcpp::Elf_types<64>::Elf_Addr value,
unsigned char* view,
off_t view_size)
{
#if 0
// leal foo(,%reg,1),%eax; call ___tls_get_addr
// ==> movl %gs,0,%eax; subl $foo@tpoff,%eax
// leal foo(%reg),%eax; call ___tls_get_addr
@ -1545,7 +1427,8 @@ Target_x86_64::Relocate::tls_gd_to_le(const Relocate_info<64, false>* , // relin
{
Target_x86_64::Relocate::check_tls(relinfo, relnum, rel,
(op1 & 0xf8) == 0x80 && (op1 & 7) != 4);
if (rel.get_r_offset() + 9 < view_size && view[9] == 0x90)
if (static_cast<off_t>(rel.get_r_offset() + 9) < view_size
&& view[9] == 0x90)
{
// There is a trailing nop. Use the size byte subl.
memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
@ -1559,12 +1442,11 @@ Target_x86_64::Relocate::tls_gd_to_le(const Relocate_info<64, false>* , // relin
}
value = tls_segment->vaddr() + tls_segment->memsz() - value;
Relocate_functions<64, false>::rel64(view + roff, value);
Relocate_functions<64, false>::rel32(view + roff, value);
// The next reloc should be a PLT32 reloc against __tls_get_addr.
// We can skip it.
this->skip_call_tls_get_addr_ = true;
#endif
}
// Check the range for a TLS relocation.