// x86_64.cc -- x86_64 target support for gold.
-// Copyright 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
-// Free Software Foundation, Inc.
+// Copyright (C) 2006-2014 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
using namespace gold;
+// A class to handle the .got.plt section.
+
+class Output_data_got_plt_x86_64 : public Output_section_data_build
+{
+ public:
+ Output_data_got_plt_x86_64(Layout* layout)
+ : Output_section_data_build(8),
+ layout_(layout)
+ { }
+
+ Output_data_got_plt_x86_64(Layout* layout, off_t data_size)
+ : Output_section_data_build(data_size, 8),
+ layout_(layout)
+ { }
+
+ protected:
+ // Write out the PLT data.
+ void
+ do_write(Output_file*);
+
+ // Write to a map file.
+ void
+ do_print_to_mapfile(Mapfile* mapfile) const
+ { mapfile->print_output_data(this, "** GOT PLT"); }
+
+ private:
+ // A pointer to the Layout class, so that we can find the .dynamic
+ // section when we write out the GOT PLT section.
+ Layout* layout_;
+};
+
// A class to handle the PLT data.
// This is an abstract base class that handles most of the linker details
// but does not know the actual contents of PLT entries. The derived
Output_data_plt_x86_64(Layout* layout, uint64_t addralign,
Output_data_got<64, false>* got,
- Output_data_space* got_plt,
+ Output_data_got_plt_x86_64* got_plt,
Output_data_space* got_irelative)
- : Output_section_data(addralign), layout_(layout), tlsdesc_rel_(NULL),
+ : Output_section_data(addralign), tlsdesc_rel_(NULL),
irelative_rel_(NULL), got_(got), got_plt_(got_plt),
got_irelative_(got_irelative), count_(0), irelative_count_(0),
tlsdesc_got_offset_(-1U), free_list_()
Output_data_plt_x86_64(Layout* layout, uint64_t plt_entry_size,
Output_data_got<64, false>* got,
- Output_data_space* got_plt,
+ Output_data_got_plt_x86_64* got_plt,
Output_data_space* got_irelative,
unsigned int plt_count)
: Output_section_data((plt_count + 1) * plt_entry_size,
plt_entry_size, false),
- layout_(layout), tlsdesc_rel_(NULL), irelative_rel_(NULL), got_(got),
+ tlsdesc_rel_(NULL), irelative_rel_(NULL), got_(got),
got_plt_(got_plt), got_irelative_(got_irelative), count_(plt_count),
irelative_count_(0), tlsdesc_got_offset_(-1U), free_list_()
{
void
do_write(Output_file*);
- // A pointer to the Layout class, so that we can find the .dynamic
- // section when we write out the GOT PLT section.
- Layout* layout_;
// The reloc section.
Reloc_section* rel_;
// The TLSDESC relocs, if necessary. These must follow the regular
// The .got section.
Output_data_got<64, false>* got_;
// The .got.plt section.
- Output_data_space* got_plt_;
+ Output_data_got_plt_x86_64* got_plt_;
// The part of the .got.plt section used for IRELATIVE relocs.
Output_data_space* got_irelative_;
// The number of PLT entries.
public:
Output_data_plt_x86_64_standard(Layout* layout,
Output_data_got<64, false>* got,
- Output_data_space* got_plt,
+ Output_data_got_plt_x86_64* got_plt,
Output_data_space* got_irelative)
: Output_data_plt_x86_64<size>(layout, plt_entry_size,
got, got_plt, got_irelative)
Output_data_plt_x86_64_standard(Layout* layout,
Output_data_got<64, false>* got,
- Output_data_space* got_plt,
+ Output_data_got_plt_x86_64* got_plt,
Output_data_space* got_irelative,
unsigned int plt_count)
: Output_data_plt_x86_64<size>(layout, plt_entry_size,
got_(NULL), plt_(NULL), got_plt_(NULL), got_irelative_(NULL),
got_tlsdesc_(NULL), global_offset_table_(NULL), rela_dyn_(NULL),
rela_irelative_(NULL), copy_relocs_(elfcpp::R_X86_64_COPY),
- dynbss_(NULL), got_mod_index_offset_(-1U), tlsdesc_reloc_info_(),
+ got_mod_index_offset_(-1U), tlsdesc_reloc_info_(),
tls_base_symbol_defined_(false)
{ }
Output_data_plt_x86_64<size>*
make_data_plt(Layout* layout,
Output_data_got<64, false>* got,
- Output_data_space* got_plt,
+ Output_data_got_plt_x86_64* got_plt,
Output_data_space* got_irelative)
{
return this->do_make_data_plt(layout, got, got_plt, got_irelative);
Output_data_plt_x86_64<size>*
make_data_plt(Layout* layout,
Output_data_got<64, false>* got,
- Output_data_space* got_plt,
+ Output_data_got_plt_x86_64* got_plt,
Output_data_space* got_irelative,
unsigned int plt_count)
{
virtual Output_data_plt_x86_64<size>*
do_make_data_plt(Layout* layout,
Output_data_got<64, false>* got,
- Output_data_space* got_plt,
+ Output_data_got_plt_x86_64* got_plt,
Output_data_space* got_irelative)
{
return new Output_data_plt_x86_64_standard<size>(layout, got, got_plt,
virtual Output_data_plt_x86_64<size>*
do_make_data_plt(Layout* layout,
Output_data_got<64, false>* got,
- Output_data_space* got_plt,
+ Output_data_got_plt_x86_64* got_plt,
Output_data_space* got_irelative,
unsigned int plt_count)
{
got_section(Symbol_table*, Layout*);
// Get the GOT PLT section.
- Output_data_space*
+ Output_data_got_plt_x86_64*
got_plt_section() const
{
gold_assert(this->got_plt_ != NULL);
// The PLT section.
Output_data_plt_x86_64<size>* plt_;
// The GOT PLT section.
- Output_data_space* got_plt_;
+ Output_data_got_plt_x86_64* got_plt_;
// The GOT section for IRELATIVE relocations.
Output_data_space* got_irelative_;
// The GOT section for TLSDESC relocations.
Reloc_section* rela_irelative_;
// Relocs saved to avoid a COPY reloc.
Copy_relocs<elfcpp::SHT_RELA, size, false> copy_relocs_;
- // Space for variables copied with a COPY reloc.
- Output_data_space* dynbss_;
// Offset of the GOT entry for the TLS module index.
unsigned int got_mod_index_offset_;
// We handle R_X86_64_TLSDESC against a local symbol as a target
0, // small_common_section_flags
elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
NULL, // attributes_section
- NULL // attributes_vendor
+ NULL, // attributes_vendor
+ "_start" // entry_symbol_name
};
template<>
0, // small_common_section_flags
elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
NULL, // attributes_section
- NULL // attributes_vendor
+ NULL, // attributes_vendor
+ "_start" // entry_symbol_name
};
// This is called when a new output section is created. This is where
| elfcpp::SHF_WRITE),
this->got_, got_order, true);
- this->got_plt_ = new Output_data_space(8, "** GOT PLT");
+ this->got_plt_ = new Output_data_got_plt_x86_64(layout);
layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
(elfcpp::SHF_ALLOC
| elfcpp::SHF_WRITE),
return this->rela_irelative_;
}
+// Write the first three reserved words of the .got.plt section.
+// The remainder of the section is written while writing the PLT
+// in Output_data_plt_i386::do_write.
+
+void
+Output_data_got_plt_x86_64::do_write(Output_file* of)
+{
+ // The first entry in the GOT is the address of the .dynamic section
+ // aka the PT_DYNAMIC segment. The next two entries are reserved.
+ // We saved space for them when we created the section in
+ // Target_x86_64::got_section.
+ const off_t got_file_offset = this->offset();
+ gold_assert(this->data_size() >= 24);
+ unsigned char* const got_view = of->get_output_view(got_file_offset, 24);
+ Output_section* dynamic = this->layout_->dynamic_section();
+ uint64_t dynamic_addr = dynamic == NULL ? 0 : dynamic->address();
+ elfcpp::Swap<64, false>::writeval(got_view, dynamic_addr);
+ memset(got_view + 8, 0, 16);
+ of->write_output_view(got_file_offset, 24, got_view);
+}
+
// Initialize the PLT section.
template<int size>
unsigned int* pcount;
unsigned int offset;
unsigned int reserved;
- Output_data_space* got;
+ Output_section_data_build* got;
if (gsym->type() == elfcpp::STT_GNU_IFUNC
&& gsym->can_use_relative_reloc(false))
{
this->fill_first_plt_entry(pov, got_address, plt_address);
pov += this->get_plt_entry_size();
- unsigned char* got_pov = got_view;
-
- // The first entry in the GOT is the address of the .dynamic section
- // aka the PT_DYNAMIC segment. The next two entries are reserved.
- // We saved space for them when we created the section in
- // Target_x86_64::got_section.
- Output_section* dynamic = this->layout_->dynamic_section();
- uint32_t dynamic_addr = dynamic == NULL ? 0 : dynamic->address();
- elfcpp::Swap<64, false>::writeval(got_pov, dynamic_addr);
- got_pov += 8;
- memset(got_pov, 0, 16);
- got_pov += 16;
+ // The first three entries in the GOT are reserved, and are written
+ // by Output_data_got_plt_x86_64::do_write.
+ unsigned char* got_pov = got_view + 24;
unsigned int plt_offset = this->get_plt_entry_size();
unsigned int got_offset = 24;
true);
// Add the three reserved entries.
- this->got_plt_ = new Output_data_space((plt_count + 3) * 8, 8, "** GOT PLT");
+ this->got_plt_ = new Output_data_got_plt_x86_64(layout, (plt_count + 3) * 8);
layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
(elfcpp::SHF_ALLOC
| elfcpp::SHF_WRITE),
case elfcpp::R_X86_64_PC64:
case elfcpp::R_X86_64_PC32:
+ case elfcpp::R_X86_64_PC32_BND:
case elfcpp::R_X86_64_PC16:
case elfcpp::R_X86_64_PC8:
case elfcpp::R_X86_64_GOTOFF64:
return Symbol::RELATIVE_REF;
case elfcpp::R_X86_64_PLT32:
+ case elfcpp::R_X86_64_PLT32_BND:
case elfcpp::R_X86_64_PLTOFF64:
return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF;
// glibc supports these reloc types, but they can overflow.
case elfcpp::R_X86_64_PC32:
+ case elfcpp::R_X86_64_PC32_BND:
// A PC relative reference is OK against a local symbol or if
// the symbol is defined locally.
if (gsym == NULL
object->error(_("requires dynamic R_X86_64_32 reloc which may "
"overflow at runtime; recompile with -fPIC"));
else
- object->error(_("requires dynamic %s reloc against '%s' which may "
- "overflow at runtime; recompile with -fPIC"),
- (r_type == elfcpp::R_X86_64_32
- ? "R_X86_64_32"
- : "R_X86_64_PC32"),
- gsym->name());
+ {
+ const char *r_name;
+ switch (r_type)
+ {
+ case elfcpp::R_X86_64_32:
+ r_name = "R_X86_64_32";
+ break;
+ case elfcpp::R_X86_64_PC32:
+ r_name = "R_X86_64_PC32";
+ break;
+ case elfcpp::R_X86_64_PC32_BND:
+ r_name = "R_X86_64_PC32_BND";
+ break;
+ default:
+ gold_unreachable();
+ break;
+ }
+ object->error(_("requires dynamic %s reloc against '%s' "
+ "which may overflow at runtime; recompile "
+ "with -fPIC"),
+ r_name, gsym->name());
+ }
this->issued_non_pic_error_ = true;
return;
case elfcpp::R_X86_64_PC64:
case elfcpp::R_X86_64_PC32:
+ case elfcpp::R_X86_64_PC32_BND:
case elfcpp::R_X86_64_PC16:
case elfcpp::R_X86_64_PC8:
break;
case elfcpp::R_X86_64_PLT32:
+ case elfcpp::R_X86_64_PLT32_BND:
// Since we know this is a local symbol, we can handle this as a
// PC32 reloc.
break;
// Make a dynamic relocation if necessary.
if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)))
{
- if (gsym->may_need_copy_reloc())
+ if (!parameters->options().output_is_position_independent()
+ && gsym->may_need_copy_reloc())
{
target->copy_reloc(symtab, layout, object,
data_shndx, output_section, gsym, reloc);
reloc.get_r_offset(),
reloc.get_r_addend());
}
- else if (r_type == elfcpp::R_X86_64_64
+ else if (((size == 64 && r_type == elfcpp::R_X86_64_64)
+ || (size == 32 && r_type == elfcpp::R_X86_64_32))
&& gsym->can_use_relative_reloc(false))
{
Reloc_section* rela_dyn = target->rela_dyn_section(layout);
case elfcpp::R_X86_64_PC64:
case elfcpp::R_X86_64_PC32:
+ case elfcpp::R_X86_64_PC32_BND:
case elfcpp::R_X86_64_PC16:
case elfcpp::R_X86_64_PC8:
{
// Make a dynamic relocation if necessary.
if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)))
{
- if (gsym->may_need_copy_reloc())
+ if (parameters->options().output_is_executable()
+ && gsym->may_need_copy_reloc())
{
target->copy_reloc(symtab, layout, object,
data_shndx, output_section, gsym, reloc);
break;
case elfcpp::R_X86_64_PLT32:
+ case elfcpp::R_X86_64_PLT32_BND:
// If the symbol is fully resolved, this is just a PC32 reloc.
// Otherwise we need a PLT entry.
if (gsym->final_value_is_known())
if (this->skip_call_tls_get_addr_)
{
if ((r_type != elfcpp::R_X86_64_PLT32
+ && r_type != elfcpp::R_X86_64_PLT32_BND
+ && r_type != elfcpp::R_X86_64_PC32_BND
&& r_type != elfcpp::R_X86_64_PC32)
|| gsym == NULL
|| strcmp(gsym->name(), "__tls_get_addr") != 0)
// We need to subtract the size of the GOT section to get
// the actual offset to use in the relocation.
bool have_got_offset = false;
- unsigned int got_offset = 0;
+ // Since the actual offset is always negative, we use signed int to
+ // support 64-bit GOT relocations.
+ int got_offset = 0;
switch (r_type)
{
case elfcpp::R_X86_64_GOT32:
break;
case elfcpp::R_X86_64_PC32:
+ case elfcpp::R_X86_64_PC32_BND:
Relocate_functions<size, false>::pcrela32(view, object, psymval, addend,
address);
break;
break;
case elfcpp::R_X86_64_PLT32:
+ case elfcpp::R_X86_64_PLT32_BND:
gold_assert(gsym == NULL
|| gsym->has_plt_offset()
|| gsym->final_value_is_known()
gold_assert(gsym->has_plt_offset()
|| gsym->final_value_is_known());
typename elfcpp::Elf_types<size>::Elf_Addr got_address;
- got_address = target->got_section(NULL, NULL)->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);
}
+ break;
case elfcpp::R_X86_64_GOT32:
gold_assert(have_got_offset);
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;
public:
Output_data_plt_x86_64_nacl(Layout* layout,
Output_data_got<64, false>* got,
- Output_data_space* got_plt,
+ Output_data_got_plt_x86_64* got_plt,
Output_data_space* got_irelative)
: Output_data_plt_x86_64<size>(layout, plt_entry_size,
got, got_plt, got_irelative)
Output_data_plt_x86_64_nacl(Layout* layout,
Output_data_got<64, false>* got,
- Output_data_space* got_plt,
+ Output_data_got_plt_x86_64* got_plt,
Output_data_space* got_irelative,
unsigned int plt_count)
: Output_data_plt_x86_64<size>(layout, plt_entry_size,
virtual Output_data_plt_x86_64<size>*
do_make_data_plt(Layout* layout,
Output_data_got<64, false>* got,
- Output_data_space* got_plt,
+ Output_data_got_plt_x86_64* got_plt,
Output_data_space* got_irelative)
{
return new Output_data_plt_x86_64_nacl<size>(layout, got, got_plt,
virtual Output_data_plt_x86_64<size>*
do_make_data_plt(Layout* layout,
Output_data_got<64, false>* got,
- Output_data_space* got_plt,
+ Output_data_got_plt_x86_64* got_plt,
Output_data_space* got_irelative,
unsigned int plt_count)
{
plt_count);
}
+ virtual std::string
+ do_code_fill(section_size_type length) const;
+
private:
static const Target::Target_info x86_64_nacl_info;
};
0, // small_common_section_flags
elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
NULL, // attributes_section
- NULL // attributes_vendor
+ NULL, // attributes_vendor
+ "_start" // entry_symbol_name
};
template<>
0, // small_common_section_flags
elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
NULL, // attributes_section
- NULL // attributes_vendor
+ NULL, // attributes_vendor
+ "_start" // entry_symbol_name
};
#define NACLMASK 0xe0 // 32-byte alignment mask.
0x41, 0xff, 0xe3, // jmpq *%r11
// 9-byte nop sequence to pad out to the next 32-byte boundary.
- 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopl %cs:0x0(%rax,%rax,1)
+ 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw 0x0(%rax,%rax,1)
// 32 bytes of nop to pad out to the standard size
0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
elfcpp::DW_CFA_nop
};
+// Return a string used to fill a code section with nops.
+// For NaCl, long NOPs are only valid if they do not cross
+// bundle alignment boundaries, so keep it simple with one-byte NOPs.
+template<int size>
+std::string
+Target_x86_64_nacl<size>::do_code_fill(section_size_type length) const
+{
+ return std::string(length, static_cast<char>(0x90));
+}
+
// The selector for x86_64-nacl object files.
template<int size>
projects / platform / upstream / binutils.git / blobdiff