// x86_64.cc -- x86_64 target support for gold.
-// Copyright (C) 2006-2015 Free Software Foundation, Inc.
+// Copyright (C) 2006-2016 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size];
};
+template<int size>
+class Lazy_view
+{
+ public:
+ Lazy_view(Sized_relobj_file<size, false>* object, unsigned int data_shndx)
+ : object_(object), data_shndx_(data_shndx), view_(NULL), view_size_(0)
+ { }
+
+ inline unsigned char
+ operator[](size_t offset)
+ {
+ if (this->view_ == NULL)
+ this->view_ = this->object_->section_contents(this->data_shndx_,
+ &this->view_size_,
+ true);
+ if (offset >= this->view_size_)
+ return 0;
+ return this->view_[offset];
+ }
+
+ private:
+ Sized_relobj_file<size, false>* object_;
+ unsigned int data_shndx_;
+ const unsigned char* view_;
+ section_size_type view_size_;
+};
+
// The x86_64 target class.
// See the ABI at
// http://www.x86-64.org/documentation/abi.pdf
const unsigned char* plocal_symbols,
Relocatable_relocs*);
+ // Scan the relocs for --emit-relocs.
+ void
+ emit_relocs_scan(Symbol_table* symtab,
+ Layout* layout,
+ Sized_relobj_file<size, false>* 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_syms,
+ Relocatable_relocs* rr);
+
// Emit relocations for a section.
void
relocate_relocs(
size_t reloc_count,
Output_section* output_section,
typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section,
- const Relocatable_relocs*,
unsigned char* view,
typename elfcpp::Elf_types<size>::Elf_Addr view_address,
section_size_type view_size,
void
do_calls_non_split(Relobj* object, unsigned int shndx,
section_offset_type fnoffset, section_size_type fnsize,
+ const unsigned char* prelocs, size_t reloc_count,
unsigned char* view, section_size_type view_size,
std::string* from, std::string* to) const;
unsigned int
plt_entry_size() const;
+ // Return the size of each GOT entry.
+ unsigned int
+ got_entry_size() const
+ { return 8; };
+
// Create the GOT section for an incremental update.
Output_data_got_base*
init_got_plt_for_update(Symbol_table* symtab,
// Do a relocation. Return false if the caller should not issue
// any warnings about this relocation.
inline bool
- relocate(const Relocate_info<size, false>*, Target_x86_64*,
- Output_section*,
- size_t relnum, const elfcpp::Rela<size, false>&,
- unsigned int r_type, const Sized_symbol<size>*,
- const Symbol_value<size>*,
+ relocate(const Relocate_info<size, false>*, unsigned int,
+ Target_x86_64*, Output_section*, size_t, const unsigned char*,
+ const Sized_symbol<size>*, const Symbol_value<size>*,
unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr,
section_size_type);
// Do a TLS General-Dynamic to Initial-Exec transition.
inline void
tls_gd_to_ie(const Relocate_info<size, false>*, size_t relnum,
- Output_segment* tls_segment,
const elfcpp::Rela<size, false>&, unsigned int r_type,
typename elfcpp::Elf_types<size>::Elf_Addr value,
unsigned char* view,
// Do a TLSDESC-style General-Dynamic to Initial-Exec transition.
inline void
tls_desc_gd_to_ie(const Relocate_info<size, false>*, size_t relnum,
- Output_segment* tls_segment,
const elfcpp::Rela<size, false>&, unsigned int r_type,
typename elfcpp::Elf_types<size>::Elf_Addr value,
unsigned char* view,
bool skip_call_tls_get_addr_;
};
- // A class which returns the size required for a relocation type,
- // used while scanning relocs during a relocatable link.
- class Relocatable_size_for_reloc
+ // Check if relocation against this symbol is a candidate for
+ // conversion from
+ // mov foo@GOTPCREL(%rip), %reg
+ // to lea foo(%rip), %reg.
+ template<class View_type>
+ static inline bool
+ can_convert_mov_to_lea(const Symbol* gsym, unsigned int r_type,
+ size_t r_offset, View_type* view)
{
- public:
- unsigned int
- get_size_for_reloc(unsigned int, Relobj*);
- };
+ gold_assert(gsym != NULL);
+ // We cannot do the conversion unless it's one of these relocations.
+ if (r_type != elfcpp::R_X86_64_GOTPCREL
+ && r_type != elfcpp::R_X86_64_GOTPCRELX
+ && r_type != elfcpp::R_X86_64_REX_GOTPCRELX)
+ return false;
+ // We cannot convert references to IFUNC symbols, or to symbols that
+ // are not local to the current module.
+ if (gsym->type() == elfcpp::STT_GNU_IFUNC
+ || gsym->is_undefined ()
+ || gsym->is_from_dynobj()
+ || gsym->is_preemptible())
+ return false;
+ // If we are building a shared object and the symbol is protected, we may
+ // need to go through the GOT.
+ if (parameters->options().shared()
+ && gsym->visibility() == elfcpp::STV_PROTECTED)
+ return false;
+ // We cannot convert references to the _DYNAMIC symbol.
+ if (strcmp(gsym->name(), "_DYNAMIC") == 0)
+ return false;
+ // Check for a MOV opcode.
+ return (*view)[r_offset - 2] == 0x8b;
+ }
+
+ // Convert
+ // callq *foo@GOTPCRELX(%rip) to
+ // addr32 callq foo
+ // and jmpq *foo@GOTPCRELX(%rip) to
+ // jmpq foo
+ // nop
+ template<class View_type>
+ static inline bool
+ can_convert_callq_to_direct(const Symbol* gsym, unsigned int r_type,
+ size_t r_offset, View_type* view)
+ {
+ gold_assert(gsym != NULL);
+ // We cannot do the conversion unless it's a GOTPCRELX relocation.
+ if (r_type != elfcpp::R_X86_64_GOTPCRELX)
+ return false;
+ // We cannot convert references to IFUNC symbols, or to symbols that
+ // are not local to the current module.
+ if (gsym->type() == elfcpp::STT_GNU_IFUNC
+ || gsym->is_undefined ()
+ || gsym->is_from_dynobj()
+ || gsym->is_preemptible())
+ return false;
+ // Check for a CALLQ or JMPQ opcode.
+ return ((*view)[r_offset - 2] == 0xff
+ && ((*view)[r_offset - 1] == 0x15
+ || (*view)[r_offset - 1] == 0x25));
+ }
// Adjust TLS relocation type based on the options and whether this
// is a local symbol.
unsigned int shndx, Output_section* output_section,
Symbol* sym, const elfcpp::Rela<size, false>& reloc)
{
+ unsigned int r_type = elfcpp::elf_r_type<size>(reloc.get_r_info());
this->copy_relocs_.copy_reloc(symtab, layout,
symtab->get_sized_symbol<size>(sym),
object, shndx, output_section,
- reloc, this->rela_dyn_section(layout));
+ r_type, reloc.get_r_offset(),
+ reloc.get_r_addend(),
+ this->rela_dyn_section(layout));
}
// Information about this specific target which we pass to the
elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
NULL, // attributes_section
NULL, // attributes_vendor
- "_start" // entry_symbol_name
+ "_start", // entry_symbol_name
+ 32, // hash_entry_size
};
template<>
elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
NULL, // attributes_section
NULL, // attributes_vendor
- "_start" // entry_symbol_name
+ "_start", // entry_symbol_name
+ 32, // hash_entry_size
};
// This is called when a new output section is created. This is where
unsigned int
Target_x86_64<size>::first_plt_entry_offset() const
{
+ if (this->plt_ == NULL)
+ return 0;
return this->plt_->first_plt_entry_offset();
}
unsigned int
Target_x86_64<size>::plt_entry_size() const
{
+ if (this->plt_ == NULL)
+ return 0;
return this->plt_->get_plt_entry_size();
}
case elfcpp::R_X86_64_GOT32:
case elfcpp::R_X86_64_GOTPCREL64:
case elfcpp::R_X86_64_GOTPCREL:
+ case elfcpp::R_X86_64_GOTPCRELX:
+ case elfcpp::R_X86_64_REX_GOTPCRELX:
case elfcpp::R_X86_64_GOTPLT64:
// Absolute in GOT.
return Symbol::ABSOLUTE_REF;
case elfcpp::R_X86_64_GOT32:
case elfcpp::R_X86_64_GOTPCREL64:
case elfcpp::R_X86_64_GOTPCREL:
+ case elfcpp::R_X86_64_GOTPCRELX:
+ case elfcpp::R_X86_64_REX_GOTPCRELX:
case elfcpp::R_X86_64_GOTPLT64:
{
- // The symbol requires a GOT entry.
+ // The symbol requires a GOT section.
Output_data_got<64, false>* got = target->got_section(symtab, layout);
+
+ // If the relocation symbol isn't IFUNC,
+ // and is local, then we will convert
+ // mov foo@GOTPCREL(%rip), %reg
+ // to lea foo(%rip), %reg.
+ // in Relocate::relocate.
+ if ((r_type == elfcpp::R_X86_64_GOTPCREL
+ || r_type == elfcpp::R_X86_64_GOTPCRELX
+ || r_type == elfcpp::R_X86_64_REX_GOTPCRELX)
+ && reloc.get_r_offset() >= 2
+ && !is_ifunc)
+ {
+ section_size_type stype;
+ const unsigned char* view = object->section_contents(data_shndx,
+ &stype, true);
+ if (view[reloc.get_r_offset() - 2] == 0x8b)
+ break;
+ }
+
+
+ // The symbol requires a GOT entry.
unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
// For a STT_GNU_IFUNC symbol we want the PLT offset. That
case elfcpp::R_X86_64_GOT32:
case elfcpp::R_X86_64_GOTPCREL64:
case elfcpp::R_X86_64_GOTPCREL:
+ case elfcpp::R_X86_64_GOTPCRELX:
+ case elfcpp::R_X86_64_REX_GOTPCRELX:
case elfcpp::R_X86_64_GOTPLT64:
{
return true;
case elfcpp::R_X86_64_GOT32:
case elfcpp::R_X86_64_GOTPCREL64:
case elfcpp::R_X86_64_GOTPCREL:
+ case elfcpp::R_X86_64_GOTPCRELX:
+ case elfcpp::R_X86_64_REX_GOTPCRELX:
case elfcpp::R_X86_64_GOTPLT64:
{
// The symbol requires a GOT entry.
Output_data_got<64, false>* got = target->got_section(symtab, layout);
+
+ // If we convert this from
+ // mov foo@GOTPCREL(%rip), %reg
+ // to lea foo(%rip), %reg.
+ // OR
+ // if we convert
+ // (callq|jmpq) *foo@GOTPCRELX(%rip) to
+ // (callq|jmpq) foo
+ // in Relocate::relocate, then there is nothing to do here.
+
+ Lazy_view<size> view(object, data_shndx);
+ size_t r_offset = reloc.get_r_offset();
+ if (r_offset >= 2
+ && Target_x86_64<size>::can_convert_mov_to_lea(gsym, r_type,
+ r_offset, &view))
+ break;
+
+ if (r_offset >= 2
+ && Target_x86_64<size>::can_convert_callq_to_direct(gsym, r_type,
+ r_offset,
+ &view))
+ break;
+
if (gsym->final_value_is_known())
{
// For a STT_GNU_IFUNC symbol we want the PLT address.
case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
case elfcpp::R_X86_64_TPOFF32: // Local-exec
{
- const bool is_final = gsym->final_value_is_known();
+ // For the Initial-Exec model, we can treat undef symbols as final
+ // when building an executable.
+ const bool is_final = (gsym->final_value_is_known() ||
+ (r_type == elfcpp::R_X86_64_GOTTPOFF &&
+ gsym->is_undefined() &&
+ parameters->options().output_is_executable()));
const tls::Tls_optimization optimized_type
= Target_x86_64<size>::optimize_tls_reloc(is_final, r_type);
switch (r_type)
size_t local_symbol_count,
const unsigned char* plocal_symbols)
{
+ typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
+ Classify_reloc;
if (sh_type == elfcpp::SHT_REL)
{
return;
}
- gold::gc_process_relocs<size, false, Target_x86_64<size>, elfcpp::SHT_RELA,
- typename Target_x86_64<size>::Scan,
- typename Target_x86_64<size>::Relocatable_size_for_reloc>(
+ gold::gc_process_relocs<size, false, Target_x86_64<size>, Scan,
+ Classify_reloc>(
symtab,
layout,
this,
size_t local_symbol_count,
const unsigned char* plocal_symbols)
{
+ typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
+ Classify_reloc;
+
if (sh_type == elfcpp::SHT_REL)
{
gold_error(_("%s: unsupported REL reloc section"),
return;
}
- gold::scan_relocs<size, false, Target_x86_64<size>, elfcpp::SHT_RELA,
- typename Target_x86_64<size>::Scan>(
+ gold::scan_relocs<size, false, Target_x86_64<size>, Scan, Classify_reloc>(
symtab,
layout,
this,
}
}
+// For x32, we need to handle PC-relative relocations using full 64-bit
+// arithmetic, so that we can detect relocation overflows properly.
+// This class overrides the pcrela32_check methods from the defaults in
+// Relocate_functions in reloc.h.
+
+template<int size>
+class X86_64_relocate_functions : public Relocate_functions<size, false>
+{
+ public:
+ typedef Relocate_functions<size, false> Base;
+
+ // Do a simple PC relative relocation with the addend in the
+ // relocation.
+ static inline typename Base::Reloc_status
+ pcrela32_check(unsigned char* view,
+ typename elfcpp::Elf_types<64>::Elf_Addr value,
+ typename elfcpp::Elf_types<64>::Elf_Swxword addend,
+ typename elfcpp::Elf_types<64>::Elf_Addr address)
+ {
+ typedef typename elfcpp::Swap<32, false>::Valtype Valtype;
+ Valtype* wv = reinterpret_cast<Valtype*>(view);
+ value = value + addend - address;
+ elfcpp::Swap<32, false>::writeval(wv, value);
+ return (Bits<32>::has_overflow(value)
+ ? Base::RELOC_OVERFLOW : Base::RELOC_OK);
+ }
+
+ // Do a simple PC relative relocation with a Symbol_value with the
+ // addend in the relocation.
+ static inline typename Base::Reloc_status
+ pcrela32_check(unsigned char* view,
+ const Sized_relobj_file<size, false>* object,
+ const Symbol_value<size>* psymval,
+ typename elfcpp::Elf_types<64>::Elf_Swxword addend,
+ typename elfcpp::Elf_types<64>::Elf_Addr address)
+ {
+ typedef typename elfcpp::Swap<32, false>::Valtype Valtype;
+ Valtype* wv = reinterpret_cast<Valtype*>(view);
+ typename elfcpp::Elf_types<64>::Elf_Addr value;
+ if (addend >= 0)
+ value = psymval->value(object, addend);
+ else
+ {
+ // For negative addends, get the symbol value without
+ // the addend, then add the addend using 64-bit arithmetic.
+ value = psymval->value(object, 0);
+ value += addend;
+ }
+ value -= address;
+ elfcpp::Swap<32, false>::writeval(wv, value);
+ return (Bits<32>::has_overflow(value)
+ ? Base::RELOC_OVERFLOW : Base::RELOC_OK);
+ }
+};
+
// Perform a relocation.
template<int size>
inline bool
Target_x86_64<size>::Relocate::relocate(
const Relocate_info<size, false>* relinfo,
+ unsigned int,
Target_x86_64<size>* target,
Output_section*,
size_t relnum,
- const elfcpp::Rela<size, false>& rela,
- unsigned int r_type,
+ const unsigned char* preloc,
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)
{
+ typedef X86_64_relocate_functions<size> Reloc_funcs;
+ const elfcpp::Rela<size, false> rela(preloc);
+ unsigned int r_type = elfcpp::elf_r_type<size>(rela.get_r_info());
+
if (this->skip_call_tls_get_addr_)
{
if ((r_type != elfcpp::R_X86_64_PLT32
+ && r_type != elfcpp::R_X86_64_GOTPCRELX
&& r_type != elfcpp::R_X86_64_PLT32_BND
&& r_type != elfcpp::R_X86_64_PC32_BND
&& r_type != elfcpp::R_X86_64_PC32)
case elfcpp::R_X86_64_GOT32:
case elfcpp::R_X86_64_GOT64:
case elfcpp::R_X86_64_GOTPLT64:
- case elfcpp::R_X86_64_GOTPCREL:
case elfcpp::R_X86_64_GOTPCREL64:
if (gsym != NULL)
{
break;
}
+ typename Reloc_funcs::Reloc_status rstatus = Reloc_funcs::RELOC_OK;
+
switch (r_type)
{
case elfcpp::R_X86_64_NONE:
break;
case elfcpp::R_X86_64_64:
- Relocate_functions<size, false>::rela64(view, object, psymval, addend);
+ Reloc_funcs::rela64(view, object, psymval, addend);
break;
case elfcpp::R_X86_64_PC64:
- Relocate_functions<size, false>::pcrela64(view, object, psymval, addend,
+ Reloc_funcs::pcrela64(view, object, psymval, addend,
address);
break;
case elfcpp::R_X86_64_32:
- // FIXME: we need to verify that value + addend fits into 32 bits:
- // uint64_t x = value + addend;
- // x == static_cast<uint64_t>(static_cast<uint32_t>(x))
- // Likewise for other <=32-bit relocations (but see R_X86_64_32S).
- Relocate_functions<size, false>::rela32(view, object, psymval, addend);
+ rstatus = Reloc_funcs::rela32_check(view, object, psymval, addend,
+ Reloc_funcs::CHECK_UNSIGNED);
break;
case elfcpp::R_X86_64_32S:
- // FIXME: we need to verify that value + addend fits into 32 bits:
- // int64_t x = value + addend; // note this quantity is signed!
- // x == static_cast<int64_t>(static_cast<int32_t>(x))
- Relocate_functions<size, false>::rela32(view, object, psymval, addend);
+ rstatus = Reloc_funcs::rela32_check(view, object, psymval, addend,
+ Reloc_funcs::CHECK_SIGNED);
break;
case elfcpp::R_X86_64_PC32:
case elfcpp::R_X86_64_PC32_BND:
- Relocate_functions<size, false>::pcrela32(view, object, psymval, addend,
- address);
+ rstatus = Reloc_funcs::pcrela32_check(view, object, psymval, addend,
+ address);
break;
case elfcpp::R_X86_64_16:
- Relocate_functions<size, false>::rela16(view, object, psymval, addend);
+ Reloc_funcs::rela16(view, object, psymval, addend);
break;
case elfcpp::R_X86_64_PC16:
- Relocate_functions<size, false>::pcrela16(view, object, psymval, addend,
- address);
+ Reloc_funcs::pcrela16(view, object, psymval, addend, address);
break;
case elfcpp::R_X86_64_8:
- Relocate_functions<size, false>::rela8(view, object, psymval, addend);
+ Reloc_funcs::rela8(view, object, psymval, addend);
break;
case elfcpp::R_X86_64_PC8:
- Relocate_functions<size, false>::pcrela8(view, object, psymval, addend,
- address);
+ Reloc_funcs::pcrela8(view, object, psymval, addend, address);
break;
case elfcpp::R_X86_64_PLT32:
// Note: while this code looks the same as for R_X86_64_PC32, it
// behaves differently because psymval was set to point to
// the PLT entry, rather than the symbol, in Scan::global().
- Relocate_functions<size, false>::pcrela32(view, object, psymval, addend,
- address);
+ rstatus = Reloc_funcs::pcrela32_check(view, object, psymval, addend,
+ address);
break;
case elfcpp::R_X86_64_PLTOFF64:
typename elfcpp::Elf_types<size>::Elf_Addr got_address;
// This is the address of GLOBAL_OFFSET_TABLE.
got_address = target->got_plt_section()->address();
- Relocate_functions<size, false>::rela64(view, object, psymval,
- addend - got_address);
+ Reloc_funcs::rela64(view, object, psymval, addend - got_address);
}
break;
case elfcpp::R_X86_64_GOT32:
gold_assert(have_got_offset);
- Relocate_functions<size, false>::rela32(view, got_offset, addend);
+ Reloc_funcs::rela32(view, got_offset, addend);
break;
case elfcpp::R_X86_64_GOTPC32:
gold_assert(gsym);
typename elfcpp::Elf_types<size>::Elf_Addr value;
value = target->got_plt_section()->address();
- Relocate_functions<size, false>::pcrela32(view, value, addend, address);
+ Reloc_funcs::pcrela32_check(view, value, addend, address);
}
break;
// R_X86_64_GOTPLT64 is obsolete and treated the the same as
// GOT64.
gold_assert(have_got_offset);
- Relocate_functions<size, false>::rela64(view, got_offset, addend);
+ Reloc_funcs::rela64(view, got_offset, addend);
break;
case elfcpp::R_X86_64_GOTPC64:
gold_assert(gsym);
typename elfcpp::Elf_types<size>::Elf_Addr value;
value = target->got_plt_section()->address();
- Relocate_functions<size, false>::pcrela64(view, value, addend, address);
+ Reloc_funcs::pcrela64(view, value, addend, address);
}
break;
typename elfcpp::Elf_types<size>::Elf_Addr value;
value = (psymval->value(object, 0)
- target->got_plt_section()->address());
- Relocate_functions<size, false>::rela64(view, value, addend);
+ Reloc_funcs::rela64(view, value, addend);
}
break;
case elfcpp::R_X86_64_GOTPCREL:
+ case elfcpp::R_X86_64_GOTPCRELX:
+ case elfcpp::R_X86_64_REX_GOTPCRELX:
{
- gold_assert(have_got_offset);
- typename elfcpp::Elf_types<size>::Elf_Addr value;
- value = target->got_plt_section()->address() + got_offset;
- Relocate_functions<size, false>::pcrela32(view, value, addend, address);
+ // Convert
+ // mov foo@GOTPCREL(%rip), %reg
+ // to lea foo(%rip), %reg.
+ // if possible.
+ if ((gsym == NULL
+ && rela.get_r_offset() >= 2
+ && view[-2] == 0x8b
+ && !psymval->is_ifunc_symbol())
+ || (gsym != NULL
+ && rela.get_r_offset() >= 2
+ && Target_x86_64<size>::can_convert_mov_to_lea(gsym, r_type,
+ 0, &view)))
+ {
+ view[-2] = 0x8d;
+ Reloc_funcs::pcrela32(view, object, psymval, addend, address);
+ }
+ // Convert
+ // callq *foo@GOTPCRELX(%rip) to
+ // addr32 callq foo
+ // and jmpq *foo@GOTPCRELX(%rip) to
+ // jmpq foo
+ // nop
+ else if (gsym != NULL
+ && rela.get_r_offset() >= 2
+ && Target_x86_64<size>::can_convert_callq_to_direct(gsym,
+ r_type,
+ 0, &view))
+ {
+ if (view[-1] == 0x15)
+ {
+ // Convert callq *foo@GOTPCRELX(%rip) to addr32 callq.
+ // Opcode of addr32 is 0x67 and opcode of direct callq is 0xe8.
+ view[-2] = 0x67;
+ view[-1] = 0xe8;
+ // Convert GOTPCRELX to 32-bit pc relative reloc.
+ Reloc_funcs::pcrela32(view, object, psymval, addend, address);
+ }
+ else
+ {
+ // Convert jmpq *foo@GOTPCRELX(%rip) to
+ // jmpq foo
+ // nop
+ // The opcode of direct jmpq is 0xe9.
+ view[-2] = 0xe9;
+ // The opcode of nop is 0x90.
+ view[3] = 0x90;
+ // Convert GOTPCRELX to 32-bit pc relative reloc. jmpq is rip
+ // relative and since the instruction following the jmpq is now
+ // the nop, offset the address by 1 byte. The start of the
+ // relocation also moves ahead by 1 byte.
+ Reloc_funcs::pcrela32(&view[-1], object, psymval, addend,
+ address - 1);
+ }
+ }
+ else
+ {
+ if (gsym != NULL)
+ {
+ gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
+ got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size();
+ }
+ 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));
+ got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD)
+ - target->got_size());
+ }
+ typename elfcpp::Elf_types<size>::Elf_Addr value;
+ value = target->got_plt_section()->address() + got_offset;
+ Reloc_funcs::pcrela32_check(view, value, addend, address);
+ }
}
break;
gold_assert(have_got_offset);
typename elfcpp::Elf_types<size>::Elf_Addr value;
value = target->got_plt_section()->address() + got_offset;
- Relocate_functions<size, false>::pcrela64(view, value, addend, address);
+ Reloc_funcs::pcrela64(view, value, addend, address);
}
break;
break;
}
+ if (rstatus == Reloc_funcs::RELOC_OVERFLOW)
+ {
+ if (gsym == NULL)
+ {
+ unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
+ gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
+ _("relocation overflow: "
+ "reference to local symbol %u in %s"),
+ r_sym, object->name().c_str());
+ }
+ else if (gsym->is_defined() && gsym->source() == Symbol::FROM_OBJECT)
+ {
+ gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
+ _("relocation overflow: "
+ "reference to '%s' defined in %s"),
+ gsym->name(),
+ gsym->object()->name().c_str());
+ }
+ else
+ {
+ gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
+ _("relocation overflow: reference to '%s'"),
+ gsym->name());
+ }
+ }
+
return true;
}
if (optimized_type == tls::TLSOPT_TO_IE)
{
value = target->got_plt_section()->address() + got_offset;
- this->tls_gd_to_ie(relinfo, relnum, tls_segment, rela, r_type,
+ this->tls_gd_to_ie(relinfo, relnum, rela, r_type,
value, view, address, view_size);
break;
}
}
if (optimized_type == tls::TLSOPT_TO_IE)
{
- if (tls_segment == NULL)
- {
- gold_assert(parameters->errors()->error_count() > 0
- || issue_undefined_symbol_error(gsym));
- return;
- }
value = target->got_plt_section()->address() + got_offset;
- this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment,
+ this->tls_desc_gd_to_ie(relinfo, relnum,
rela, r_type, value, view, address,
view_size);
break;
break;
case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
- if (optimized_type == tls::TLSOPT_TO_LE)
+ if (gsym != NULL
+ && gsym->is_undefined()
+ && parameters->options().output_is_executable())
+ {
+ Target_x86_64<size>::Relocate::tls_ie_to_le(relinfo, relnum,
+ NULL, rela,
+ r_type, value, view,
+ view_size);
+ break;
+ }
+ else if (optimized_type == tls::TLSOPT_TO_LE)
{
if (tls_segment == NULL)
{
Target_x86_64<size>::Relocate::tls_gd_to_ie(
const Relocate_info<size, false>* relinfo,
size_t relnum,
- Output_segment*,
const elfcpp::Rela<size, false>& rela,
unsigned int,
typename elfcpp::Elf_types<size>::Elf_Addr value,
{
// For SIZE == 64:
// .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
- // .word 0x6666; rex64; call __tls_get_addr
+ // .word 0x6666; rex64; call __tls_get_addr@PLT
+ // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax
+ // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
+ // .word 0x66; rex64; call *__tls_get_addr@GOTPCREL(%rip)
// ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax
// For SIZE == 32:
// leaq foo@tlsgd(%rip),%rdi;
- // .word 0x6666; rex64; call __tls_get_addr
+ // .word 0x6666; rex64; call __tls_get_addr@PLT
+ // ==> movl %fs:0,%eax; addq x@gottpoff(%rip),%rax
+ // leaq foo@tlsgd(%rip),%rdi;
+ // .word 0x66; rex64; call *__tls_get_addr@GOTPCREL(%rip)
// ==> movl %fs:0,%eax; addq x@gottpoff(%rip),%rax
tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12);
tls::check_tls(relinfo, relnum, rela.get_r_offset(),
- (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0));
+ (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0
+ || memcmp(view + 4, "\x66\x48\xff", 3) == 0));
if (size == 64)
{
{
// For SIZE == 64:
// .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
- // .word 0x6666; rex64; call __tls_get_addr
+ // .word 0x6666; rex64; call __tls_get_addr@PLT
+ // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax
+ // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
+ // .word 0x66; rex64; call *__tls_get_addr@GOTPCREL(%rip)
// ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax
// For SIZE == 32:
// leaq foo@tlsgd(%rip),%rdi;
- // .word 0x6666; rex64; call __tls_get_addr
+ // .word 0x6666; rex64; call __tls_get_addr@PLT
+ // ==> movl %fs:0,%eax; leaq x@tpoff(%rax),%rax
+ // leaq foo@tlsgd(%rip),%rdi;
+ // .word 0x66; rex64; call *__tls_get_addr@GOTPCREL(%rip)
// ==> movl %fs:0,%eax; leaq x@tpoff(%rax),%rax
tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12);
tls::check_tls(relinfo, relnum, rela.get_r_offset(),
- (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0));
+ (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0
+ || memcmp(view + 4, "\x66\x48\xff", 3) == 0));
if (size == 64)
{
Target_x86_64<size>::Relocate::tls_desc_gd_to_ie(
const Relocate_info<size, false>* relinfo,
size_t relnum,
- Output_segment*,
const elfcpp::Rela<size, false>& rela,
unsigned int r_type,
typename elfcpp::Elf_types<size>::Elf_Addr value,
// For SIZE == 32:
// ... leq foo@dtpoff(%rax),%reg
// ==> nopl 0x0(%rax); movl %fs:0,%eax ... leaq x@tpoff(%rax),%rdx
+ // leaq foo@tlsld(%rip),%rdi; call *__tls_get_addr@GOTPCREL(%rip)
+ // For SIZE == 64:
+ // ... leq foo@dtpoff(%rax),%reg
+ // ==> .word 0x6666; .byte 0x6666; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx
+ // For SIZE == 32:
+ // ... leq foo@dtpoff(%rax),%reg
+ // ==> nopw 0x0(%rax); movl %fs:0,%eax ... leaq x@tpoff(%rax),%rdx
tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9);
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);
+ tls::check_tls(relinfo, relnum, rela.get_r_offset(),
+ view[4] == 0xe8 || view[4] == 0xff);
- if (size == 64)
- memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12);
+ if (view[4] == 0xe8)
+ {
+ if (size == 64)
+ memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12);
+ else
+ memcpy(view - 3, "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0\0", 12);
+ }
else
- memcpy(view - 3, "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0\0", 12);
+ {
+ if (size == 64)
+ memcpy(view - 3, "\x66\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0",
+ 13);
+ else
+ memcpy(view - 3, "\x66\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0\0",
+ 13);
+ }
// The next reloc should be a PLT32 reloc against __tls_get_addr.
// We can skip it.
view[-1] = 0x80 | reg | (reg << 3);
}
- value -= tls_segment->memsz();
+ if (tls_segment != NULL)
+ value -= tls_segment->memsz();
Relocate_functions<size, false>::rela32(view, value, 0);
}
section_size_type view_size,
const Reloc_symbol_changes* reloc_symbol_changes)
{
+ typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
+ Classify_reloc;
+
gold_assert(sh_type == elfcpp::SHT_RELA);
- gold::relocate_section<size, false, Target_x86_64<size>, elfcpp::SHT_RELA,
- typename Target_x86_64<size>::Relocate,
- gold::Default_comdat_behavior>(
+ gold::relocate_section<size, false, Target_x86_64<size>, Relocate,
+ gold::Default_comdat_behavior, Classify_reloc>(
relinfo,
this,
prelocs,
view_size);
}
-// Return the size of a relocation while scanning during a relocatable
-// link.
+// Scan the relocs during a relocatable link.
template<int size>
-unsigned int
-Target_x86_64<size>::Relocatable_size_for_reloc::get_size_for_reloc(
- unsigned int r_type,
- Relobj* object)
+void
+Target_x86_64<size>::scan_relocatable_relocs(
+ Symbol_table* symtab,
+ Layout* layout,
+ Sized_relobj_file<size, false>* 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)
{
- switch (r_type)
- {
- case elfcpp::R_X86_64_NONE:
- case elfcpp::R_X86_64_GNU_VTINHERIT:
- case elfcpp::R_X86_64_GNU_VTENTRY:
- case elfcpp::R_X86_64_TLSGD: // Global-dynamic
- case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
- case elfcpp::R_X86_64_TLSDESC_CALL:
- case elfcpp::R_X86_64_TLSLD: // Local-dynamic
- case elfcpp::R_X86_64_DTPOFF32:
- case elfcpp::R_X86_64_DTPOFF64:
- case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
- case elfcpp::R_X86_64_TPOFF32: // Local-exec
- return 0;
+ typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
+ Classify_reloc;
+ typedef gold::Default_scan_relocatable_relocs<Classify_reloc>
+ Scan_relocatable_relocs;
- case elfcpp::R_X86_64_64:
- case elfcpp::R_X86_64_PC64:
- case elfcpp::R_X86_64_GOTOFF64:
- case elfcpp::R_X86_64_GOTPC64:
- case elfcpp::R_X86_64_PLTOFF64:
- case elfcpp::R_X86_64_GOT64:
- case elfcpp::R_X86_64_GOTPCREL64:
- case elfcpp::R_X86_64_GOTPCREL:
- case elfcpp::R_X86_64_GOTPLT64:
- return 8;
-
- case elfcpp::R_X86_64_32:
- case elfcpp::R_X86_64_32S:
- case elfcpp::R_X86_64_PC32:
- case elfcpp::R_X86_64_PC32_BND:
- case elfcpp::R_X86_64_PLT32:
- case elfcpp::R_X86_64_PLT32_BND:
- case elfcpp::R_X86_64_GOTPC32:
- case elfcpp::R_X86_64_GOT32:
- return 4;
-
- case elfcpp::R_X86_64_16:
- case elfcpp::R_X86_64_PC16:
- return 2;
-
- case elfcpp::R_X86_64_8:
- case elfcpp::R_X86_64_PC8:
- return 1;
-
- case elfcpp::R_X86_64_COPY:
- case elfcpp::R_X86_64_GLOB_DAT:
- case elfcpp::R_X86_64_JUMP_SLOT:
- case elfcpp::R_X86_64_RELATIVE:
- case elfcpp::R_X86_64_IRELATIVE:
- // These are outstanding tls relocs, which are unexpected when linking
- case elfcpp::R_X86_64_TPOFF64:
- case elfcpp::R_X86_64_DTPMOD64:
- case elfcpp::R_X86_64_TLSDESC:
- object->error(_("unexpected reloc %u in object file"), r_type);
- return 0;
+ gold_assert(sh_type == elfcpp::SHT_RELA);
- case elfcpp::R_X86_64_SIZE32:
- case elfcpp::R_X86_64_SIZE64:
- default:
- object->error(_("unsupported reloc %u against local symbol"), r_type);
- return 0;
- }
+ gold::scan_relocatable_relocs<size, false, Scan_relocatable_relocs>(
+ symtab,
+ layout,
+ object,
+ data_shndx,
+ prelocs,
+ reloc_count,
+ output_section,
+ needs_special_offset_handling,
+ local_symbol_count,
+ plocal_symbols,
+ rr);
}
-// Scan the relocs during a relocatable link.
+// Scan the relocs for --emit-relocs.
template<int size>
void
-Target_x86_64<size>::scan_relocatable_relocs(
+Target_x86_64<size>::emit_relocs_scan(
Symbol_table* symtab,
Layout* layout,
Sized_relobj_file<size, false>* object,
Output_section* output_section,
bool needs_special_offset_handling,
size_t local_symbol_count,
- const unsigned char* plocal_symbols,
+ const unsigned char* plocal_syms,
Relocatable_relocs* rr)
{
- gold_assert(sh_type == elfcpp::SHT_RELA);
+ typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
+ Classify_reloc;
+ typedef gold::Default_emit_relocs_strategy<Classify_reloc>
+ Emit_relocs_strategy;
- typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA,
- Relocatable_size_for_reloc> Scan_relocatable_relocs;
+ gold_assert(sh_type == elfcpp::SHT_RELA);
- gold::scan_relocatable_relocs<size, false, elfcpp::SHT_RELA,
- Scan_relocatable_relocs>(
+ gold::scan_relocatable_relocs<size, false, Emit_relocs_strategy>(
symtab,
layout,
object,
output_section,
needs_special_offset_handling,
local_symbol_count,
- plocal_symbols,
+ plocal_syms,
rr);
}
size_t reloc_count,
Output_section* output_section,
typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section,
- const Relocatable_relocs* rr,
unsigned char* view,
typename elfcpp::Elf_types<size>::Elf_Addr view_address,
section_size_type view_size,
unsigned char* reloc_view,
section_size_type reloc_view_size)
{
+ typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
+ Classify_reloc;
+
gold_assert(sh_type == elfcpp::SHT_RELA);
- gold::relocate_relocs<size, false, elfcpp::SHT_RELA>(
+ gold::relocate_relocs<size, false, Classify_reloc>(
relinfo,
prelocs,
reloc_count,
output_section,
offset_in_output_section,
- rr,
view,
view_address,
view_size,
Target_x86_64<size>::do_calls_non_split(Relobj* object, unsigned int shndx,
section_offset_type fnoffset,
section_size_type fnsize,
+ const unsigned char*,
+ size_t,
unsigned char* view,
section_size_type view_size,
std::string* from,
elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
NULL, // attributes_section
NULL, // attributes_vendor
- "_start" // entry_symbol_name
+ "_start", // entry_symbol_name
+ 32, // hash_entry_size
};
template<>
elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
NULL, // attributes_section
NULL, // attributes_vendor
- "_start" // entry_symbol_name
+ "_start", // entry_symbol_name
+ 32, // hash_entry_size
};
#define NACLMASK 0xe0 // 32-byte alignment mask.
projects / deliverable / binutils-gdb.git / blobdiff