// i386.cc -- i386 target support for gold.
+// Copyright 2006, 2007 Free Software Foundation, Inc.
+// Written by Ian Lance Taylor <iant@google.com>.
+
+// This file is part of gold.
+
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+// MA 02110-1301, USA.
+
#include "gold.h"
#include <cstring>
#include "elfcpp.h"
+#include "parameters.h"
#include "reloc.h"
#include "i386.h"
#include "object.h"
#include "target.h"
#include "target-reloc.h"
#include "target-select.h"
+#include "tls.h"
namespace
{
class Output_data_plt_i386;
// The i386 target class.
+// TLS info comes from
+// http://people.redhat.com/drepper/tls.pdf
+// http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt
class Target_i386 : public Sized_target<32, false>
{
public:
+ typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section;
+
Target_i386()
: Sized_target<32, false>(&i386_info),
- got_(NULL), plt_(NULL), got_plt_(NULL)
+ got_(NULL), plt_(NULL), got_plt_(NULL), rel_dyn_(NULL),
+ copy_relocs_(NULL), dynbss_(NULL)
{ }
// Scan the relocations to look for symbol adjustments.
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,
- Symbol** global_symbols);
+ const unsigned char* plocal_symbols);
+
+ // Finalize the sections.
+ void
+ do_finalize_sections(Layout*);
+
+ // Return the value to use for a dynamic which requires special
+ // treatment.
+ uint64_t
+ do_dynsym_value(const Symbol*) const;
+
+ // Return whether SYM is always defined.
+ bool
+ do_is_always_defined(Symbol* sym) const
+ { return strcmp(sym->name(), "___tls_get_addr") == 0; }
// Relocate a section.
void
unsigned int sh_type,
const unsigned char* prelocs,
size_t reloc_count,
+ Output_section* output_section,
+ bool needs_special_offset_handling,
unsigned char* view,
elfcpp::Elf_types<32>::Elf_Addr view_address,
off_t view_size);
+ // Return a string used to fill a code section with nops.
+ std::string
+ do_code_fill(off_t length);
+
+ // Return the size of the GOT section.
+ off_t
+ got_size()
+ {
+ gold_assert(this->got_ != NULL);
+ return this->got_->data_size();
+ }
+
private:
// The class which scans relocations.
struct Scan
unsigned int data_shndx,
const elfcpp::Rel<32, false>& reloc, unsigned int r_type,
Symbol* gsym);
+
+ static void
+ unsupported_reloc_local(Sized_relobj<32, false>*, unsigned int r_type);
+
+ static void
+ unsupported_reloc_global(Sized_relobj<32, false>*, unsigned int r_type,
+ Symbol*);
};
// The class which implements relocation.
{
public:
Relocate()
- : skip_call_tls_get_addr_(false)
+ : skip_call_tls_get_addr_(false),
+ local_dynamic_type_(LOCAL_DYNAMIC_NONE)
{ }
~Relocate()
if (this->skip_call_tls_get_addr_)
{
// FIXME: This needs to specify the location somehow.
- fprintf(stderr, _("%s: missing expected TLS relocation\n"),
- program_name);
- gold_exit(false);
+ gold_error(_("missing expected TLS relocation"));
}
}
+ // Return whether the static relocation needs to be applied.
+ inline bool
+ should_apply_static_reloc(const Sized_symbol<32>* gsym,
+ bool is_absolute_ref,
+ bool is_function_call,
+ bool is_32bit);
+
// Do a relocation. Return false if the caller should not issue
// any warnings about this relocation.
inline bool
relocate(const Relocate_info<32, false>*, Target_i386*, size_t relnum,
const elfcpp::Rel<32, false>&,
unsigned int r_type, const Sized_symbol<32>*,
- elfcpp::Elf_types<32>::Elf_Addr,
+ const Symbol_value<32>*,
unsigned char*, elfcpp::Elf_types<32>::Elf_Addr,
off_t);
relocate_tls(const Relocate_info<32, false>*, size_t relnum,
const elfcpp::Rel<32, false>&,
unsigned int r_type, const Sized_symbol<32>*,
- elfcpp::Elf_types<32>::Elf_Addr,
+ const Symbol_value<32>*,
unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, off_t);
- // Do a TLS Initial-Exec to Local-Exec transition.
- static inline void
- tls_ie_to_le(const Relocate_info<32, false>*, size_t relnum,
+ // Do a TLS General-Dynamic to Local-Exec transition.
+ inline void
+ tls_gd_to_le(const Relocate_info<32, false>*, size_t relnum,
Output_segment* tls_segment,
const elfcpp::Rel<32, false>&, unsigned int r_type,
elfcpp::Elf_types<32>::Elf_Addr value,
unsigned char* view,
off_t view_size);
- // Do a TLS Global-Dynamic to Local-Exec transition.
+ // Do a TLS Local-Dynamic to Local-Exec transition.
inline void
- tls_gd_to_le(const Relocate_info<32, false>*, size_t relnum,
+ tls_ld_to_le(const Relocate_info<32, false>*, size_t relnum,
Output_segment* tls_segment,
const elfcpp::Rel<32, false>&, unsigned int r_type,
elfcpp::Elf_types<32>::Elf_Addr value,
unsigned char* view,
off_t view_size);
- // Check the range for a TLS relocation.
+ // Do a TLS Initial-Exec to Local-Exec transition.
static inline void
- check_range(const Relocate_info<32, false>*, size_t relnum,
- const elfcpp::Rel<32, false>&, off_t, off_t);
+ tls_ie_to_le(const Relocate_info<32, false>*, size_t relnum,
+ Output_segment* tls_segment,
+ const elfcpp::Rel<32, false>&, unsigned int r_type,
+ elfcpp::Elf_types<32>::Elf_Addr value,
+ unsigned char* view,
+ off_t view_size);
- // Check the validity of a TLS relocation. This is like assert.
- static inline void
- check_tls(const Relocate_info<32, false>*, size_t relnum,
- const elfcpp::Rel<32, false>&, bool);
+ // We need to keep track of which type of local dynamic relocation
+ // we have seen, so that we can optimize R_386_TLS_LDO_32 correctly.
+ enum Local_dynamic_type
+ {
+ LOCAL_DYNAMIC_NONE,
+ LOCAL_DYNAMIC_SUN,
+ LOCAL_DYNAMIC_GNU
+ };
// This is set if we should skip the next reloc, which should be a
// PLT32 reloc against ___tls_get_addr.
bool skip_call_tls_get_addr_;
+ // The type of local dynamic relocation we have seen in the section
+ // being relocated, if any.
+ Local_dynamic_type local_dynamic_type_;
};
// Adjust TLS relocation type based on the options and whether this
// is a local symbol.
- static unsigned int
- optimize_tls_reloc(const General_options*, bool is_final, int r_type);
+ static tls::Tls_optimization
+ optimize_tls_reloc(bool is_final, int r_type);
// Get the GOT section, creating it if necessary.
Output_data_got<32, false>*
- got_section(const General_options*, Symbol_table*, Layout*);
+ got_section(Symbol_table*, Layout*);
+
+ // Get the GOT PLT section.
+ Output_data_space*
+ got_plt_section() const
+ {
+ gold_assert(this->got_plt_ != NULL);
+ return this->got_plt_;
+ }
// Create a PLT entry for a global symbol.
void
- make_plt_entry(const General_options* options, Symbol_table*,
- Layout*, Symbol*);
+ make_plt_entry(Symbol_table*, Layout*, Symbol*);
// Get the PLT section.
- Output_data_plt_i386*
+ const Output_data_plt_i386*
plt_section() const
{
gold_assert(this->plt_ != NULL);
return this->plt_;
}
+ // Get the dynamic reloc section, creating it if necessary.
+ Reloc_section*
+ rel_dyn_section(Layout*);
+
+ // Return true if the symbol may need a COPY relocation.
+ // References from an executable object to non-function symbols
+ // defined in a dynamic object may need a COPY relocation.
+ bool
+ may_need_copy_reloc(Symbol* gsym)
+ {
+ return (!parameters->output_is_shared()
+ && gsym->is_from_dynobj()
+ && gsym->type() != elfcpp::STT_FUNC);
+ }
+
// Copy a relocation against a global symbol.
void
- copy_reloc(const General_options*, Sized_relobj<32, false>*, unsigned int,
+ copy_reloc(const General_options*, Symbol_table*, Layout*,
+ Sized_relobj<32, false>*, unsigned int,
Symbol*, const elfcpp::Rel<32, false>&);
// Information about this specific target which we pass to the
Output_data_plt_i386* plt_;
// The GOT PLT section.
Output_data_space* got_plt_;
+ // The dynamic reloc section.
+ Reloc_section* rel_dyn_;
+ // Relocs saved to avoid a COPY reloc.
+ Copy_relocs<32, false>* copy_relocs_;
+ // Space for variables copied with a COPY reloc.
+ Output_data_space* dynbss_;
};
const Target::Target_info Target_i386::i386_info =
elfcpp::EM_386, // machine_code
false, // has_make_symbol
false, // has_resolve
+ true, // has_code_fill
+ true, // is_default_stack_executable
"/usr/lib/libc.so.1", // dynamic_linker
- 0x08048000, // text_segment_address
+ 0x08048000, // default_text_segment_address
0x1000, // abi_pagesize
0x1000 // common_pagesize
};
// Get the GOT section, creating it if necessary.
Output_data_got<32, false>*
-Target_i386::got_section(const General_options* options, Symbol_table* symtab,
- Layout* layout)
+Target_i386::got_section(Symbol_table* symtab, Layout* layout)
{
if (this->got_ == NULL)
{
- gold_assert(options != NULL && symtab != NULL && layout != NULL);
+ gold_assert(symtab != NULL && layout != NULL);
- this->got_ = new Output_data_got<32, false>(options);
+ this->got_ = new Output_data_got<32, false>();
layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
- elfcpp::SHF_ALLOC, this->got_);
+ elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
+ this->got_);
// The old GNU linker creates a .got.plt section. We just
// create another set of data in the .got section. Note that we
// might be empty.
this->got_plt_ = new Output_data_space(4);
layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
- elfcpp::SHF_ALLOC, this->got_plt_);
+ elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
+ this->got_plt_);
// The first three entries are reserved.
this->got_plt_->set_space_size(3 * 4);
// Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
- symtab->define_in_output_data(this, "_GLOBAL_OFFSET_TABLE_",
+ symtab->define_in_output_data(this, "_GLOBAL_OFFSET_TABLE_", NULL,
this->got_plt_,
0, 0, elfcpp::STT_OBJECT,
- elfcpp::STB_GLOBAL,
+ elfcpp::STB_LOCAL,
elfcpp::STV_HIDDEN, 0,
false, false);
}
return this->got_;
}
+// Get the dynamic reloc section, creating it if necessary.
+
+Target_i386::Reloc_section*
+Target_i386::rel_dyn_section(Layout* layout)
+{
+ if (this->rel_dyn_ == NULL)
+ {
+ gold_assert(layout != NULL);
+ this->rel_dyn_ = new Reloc_section();
+ layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL,
+ elfcpp::SHF_ALLOC, this->rel_dyn_);
+ }
+ return this->rel_dyn_;
+}
+
// A class to handle the PLT data.
class Output_data_plt_i386 : public Output_section_data
public:
typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section;
- Output_data_plt_i386(Layout*, Output_data_space*, bool is_shared);
+ Output_data_plt_i386(Layout*, Output_data_space*);
// Add an entry to the PLT.
void
add_entry(Symbol* gsym);
+ // Return the .rel.plt section data.
+ const Reloc_section*
+ rel_plt() const
+ { return this->rel_; }
+
+ protected:
+ void
+ do_adjust_output_section(Output_section* os);
+
private:
// The size of an entry in the PLT.
static const int plt_entry_size = 16;
Output_data_space* got_plt_;
// The number of PLT entries.
unsigned int count_;
- // Whether we are generated a shared object.
- bool is_shared_;
};
// Create the PLT section. The ordinary .got section is an argument,
// section just for PLT entries.
Output_data_plt_i386::Output_data_plt_i386(Layout* layout,
- Output_data_space* got_plt,
- bool is_shared)
- : Output_section_data(4), got_plt_(got_plt), is_shared_(is_shared)
+ Output_data_space* got_plt)
+ : Output_section_data(4), got_plt_(got_plt), count_(0)
{
this->rel_ = new Reloc_section();
layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL,
elfcpp::SHF_ALLOC, this->rel_);
}
+void
+Output_data_plt_i386::do_adjust_output_section(Output_section* os)
+{
+ // UnixWare sets the entsize of .plt to 4, and so does the old GNU
+ // linker, and so do we.
+ os->set_entsize(4);
+}
+
// Add an entry to the PLT.
void
this->got_plt_->set_space_size(got_offset + 4);
// Every PLT entry needs a reloc.
+ gsym->set_needs_dynsym_entry();
this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_,
got_offset);
elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address();
elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address();
- if (this->is_shared_)
+ if (parameters->output_is_shared())
memcpy(pov, dyn_first_plt_entry, plt_entry_size);
else
{
{
// Set and adjust the PLT entry itself.
- if (this->is_shared_)
+ if (parameters->output_is_shared())
{
memcpy(pov, dyn_plt_entry, plt_entry_size);
elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset);
// Create a PLT entry for a global symbol.
void
-Target_i386::make_plt_entry(const General_options* options,
- Symbol_table* symtab, Layout* layout, Symbol* gsym)
+Target_i386::make_plt_entry(Symbol_table* symtab, Layout* layout, Symbol* gsym)
{
if (gsym->has_plt_offset())
return;
if (this->plt_ == NULL)
{
// Create the GOT sections first.
- this->got_section(options, symtab, layout);
+ this->got_section(symtab, layout);
- this->plt_ = new Output_data_plt_i386(layout, this->got_plt_,
- options->is_shared());
+ this->plt_ = new Output_data_plt_i386(layout, this->got_plt_);
+ layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
+ (elfcpp::SHF_ALLOC
+ | elfcpp::SHF_EXECINSTR),
+ this->plt_);
}
this->plt_->add_entry(gsym);
void
Target_i386::copy_reloc(const General_options* options,
+ Symbol_table* symtab,
+ Layout* layout,
Sized_relobj<32, false>* object,
unsigned int data_shndx, Symbol* gsym,
- const elfcpp::Rel<32, false>&)
+ const elfcpp::Rel<32, false>& rel)
{
- if (!Relocate_functions<32, false>::need_copy_reloc(options, object,
- data_shndx, gsym))
+ Sized_symbol<32>* ssym;
+ ssym = symtab->get_sized_symbol SELECT_SIZE_NAME(32) (gsym
+ SELECT_SIZE(32));
+
+ if (!Copy_relocs<32, false>::need_copy_reloc(options, object,
+ data_shndx, ssym))
{
// So far we do not need a COPY reloc. Save this relocation.
- // If it turns out that we never a COPY reloc for this symbol,
- // then we emit the relocation.
+ // If it turns out that we never need a COPY reloc for this
+ // symbol, then we will emit the relocation.
+ if (this->copy_relocs_ == NULL)
+ this->copy_relocs_ = new Copy_relocs<32, false>();
+ this->copy_relocs_->save(ssym, object, data_shndx, rel);
}
+ else
+ {
+ // Allocate space for this symbol in the .bss section.
+
+ elfcpp::Elf_types<32>::Elf_WXword symsize = ssym->symsize();
+
+ // There is no defined way to determine the required alignment
+ // of the symbol. We pick the alignment based on the size. We
+ // set an arbitrary maximum of 256.
+ unsigned int align;
+ for (align = 1; align < 512; align <<= 1)
+ if ((symsize & align) != 0)
+ break;
+
+ if (this->dynbss_ == NULL)
+ {
+ this->dynbss_ = new Output_data_space(align);
+ layout->add_output_section_data(".bss",
+ elfcpp::SHT_NOBITS,
+ (elfcpp::SHF_ALLOC
+ | elfcpp::SHF_WRITE),
+ this->dynbss_);
+ }
+
+ Output_data_space* dynbss = this->dynbss_;
+
+ if (align > dynbss->addralign())
+ dynbss->set_space_alignment(align);
+ off_t dynbss_size = dynbss->data_size();
+ dynbss_size = align_address(dynbss_size, align);
+ off_t offset = dynbss_size;
+ dynbss->set_space_size(dynbss_size + symsize);
+
+ symtab->define_with_copy_reloc(this, ssym, dynbss, offset);
+
+ // Add the COPY reloc.
+ Reloc_section* rel_dyn = this->rel_dyn_section(layout);
+ rel_dyn->add_global(ssym, elfcpp::R_386_COPY, dynbss, offset);
+ }
}
// Optimize the TLS relocation type based on what we know about the
// symbol. IS_FINAL is true if the final address of this symbol is
// known at link time.
-unsigned int
-Target_i386::optimize_tls_reloc(const General_options* options,
- bool is_final,
- int r_type)
+tls::Tls_optimization
+Target_i386::optimize_tls_reloc(bool is_final, int r_type)
{
// If we are generating a shared library, then we can't do anything
// in the linker.
- if (options->is_shared())
- return r_type;
+ if (parameters->output_is_shared())
+ return tls::TLSOPT_NONE;
switch (r_type)
{
case elfcpp::R_386_TLS_GD:
case elfcpp::R_386_TLS_GOTDESC:
case elfcpp::R_386_TLS_DESC_CALL:
- // These are Global-Dynamic which permits fully general TLS
+ // These are General-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_386_TLS_LE_32;
- return elfcpp::R_386_TLS_IE_32;
+ return tls::TLSOPT_TO_LE;
+ return tls::TLSOPT_TO_IE;
case elfcpp::R_386_TLS_LDM:
// 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_386_TLS_LE_32;
+ return tls::TLSOPT_TO_LE;
case elfcpp::R_386_TLS_LDO_32:
// Another type of Local-Dynamic relocation.
- return elfcpp::R_386_TLS_LE;
+ return tls::TLSOPT_TO_LE;
case elfcpp::R_386_TLS_IE:
case elfcpp::R_386_TLS_GOTIE:
// local symbol, we can switch to Local-Exec, which links the
// thread offset into the instruction.
if (is_final)
- return elfcpp::R_386_TLS_LE_32;
- return r_type;
-
+ return tls::TLSOPT_TO_LE;
+ return tls::TLSOPT_NONE;
+
case elfcpp::R_386_TLS_LE:
case elfcpp::R_386_TLS_LE_32:
// When we already have Local-Exec, there is nothing further we
// can do.
- return r_type;
+ return tls::TLSOPT_NONE;
default:
gold_unreachable();
}
}
+// Report an unsupported relocation against a local symbol.
+
+void
+Target_i386::Scan::unsupported_reloc_local(Sized_relobj<32, false>* object,
+ unsigned int r_type)
+{
+ gold_error(_("%s: unsupported reloc %u against local symbol"),
+ object->name().c_str(), r_type);
+}
+
// Scan a relocation for a local symbol.
inline void
-Target_i386::Scan::local(const General_options& options,
+Target_i386::Scan::local(const General_options&,
Symbol_table* symtab,
Layout* layout,
Target_i386* target,
Sized_relobj<32, false>* object,
- unsigned int,
- const elfcpp::Rel<32, false>&,
+ unsigned int data_shndx,
+ const elfcpp::Rel<32, false>& reloc,
unsigned int r_type,
const elfcpp::Sym<32, false>&)
{
break;
case elfcpp::R_386_32:
+ // If building a shared library (or a position-independent
+ // executable), we need to create a dynamic relocation for
+ // this location. The relocation applied at link time will
+ // apply the link-time value, so we flag the location with
+ // an R_386_RELATIVE relocation so the dynamic loader can
+ // relocate it easily.
+ if (parameters->output_is_position_independent())
+ {
+ Reloc_section* rel_dyn = target->rel_dyn_section(layout);
+ rel_dyn->add_local(object, 0, elfcpp::R_386_RELATIVE, data_shndx,
+ reloc.get_r_offset());
+ }
+ break;
+
case elfcpp::R_386_16:
case elfcpp::R_386_8:
- // FIXME: If we are generating a shared object we need to copy
- // this relocation into the object.
- gold_assert(!options.is_shared());
+ // If building a shared library (or a position-independent
+ // executable), we need to create a dynamic relocation for
+ // this location. Because the addend needs to remain in the
+ // data section, we need to be careful not to apply this
+ // relocation statically.
+ if (parameters->output_is_position_independent())
+ {
+ Reloc_section* rel_dyn = target->rel_dyn_section(layout);
+ unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
+ rel_dyn->add_local(object, r_sym, r_type, data_shndx,
+ reloc.get_r_offset());
+ }
break;
case elfcpp::R_386_PC32:
case elfcpp::R_386_PC8:
break;
+ case elfcpp::R_386_PLT32:
+ // Since we know this is a local symbol, we can handle this as a
+ // PC32 reloc.
+ break;
+
case elfcpp::R_386_GOTOFF:
case elfcpp::R_386_GOTPC:
// We need a GOT section.
- target->got_section(&options, symtab, layout);
+ target->got_section(symtab, layout);
break;
+ case elfcpp::R_386_GOT32:
+ {
+ // The symbol requires a GOT entry.
+ Output_data_got<32, false>* got = target->got_section(symtab, layout);
+ unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
+ if (got->add_local(object, r_sym))
+ {
+ // If we are generating a shared object, we need to add a
+ // dynamic RELATIVE relocation for this symbol.
+ if (parameters->output_is_position_independent())
+ {
+ Reloc_section* rel_dyn = target->rel_dyn_section(layout);
+ rel_dyn->add_local(object, 0, elfcpp::R_386_RELATIVE,
+ data_shndx, reloc.get_r_offset());
+ }
+ }
+ }
+ break;
+
+ // These are relocations which should only be seen by the
+ // dynamic linker, and should never be seen here.
case elfcpp::R_386_COPY:
case elfcpp::R_386_GLOB_DAT:
case elfcpp::R_386_JUMP_SLOT:
case elfcpp::R_386_TLS_DTPOFF32:
case elfcpp::R_386_TLS_TPOFF32:
case elfcpp::R_386_TLS_DESC:
- fprintf(stderr, _("%s: %s: unexpected reloc %u in object file\n"),
- program_name, object->name().c_str(), r_type);
- gold_exit(false);
+ gold_error(_("%s: unexpected reloc %u in object file"),
+ object->name().c_str(), r_type);
break;
- 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_32:
+ // These are initial TLS relocs, which are expected when
+ // linking.
+ case elfcpp::R_386_TLS_GD: // Global-dynamic
+ case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url)
+ case elfcpp::R_386_TLS_DESC_CALL:
+ case elfcpp::R_386_TLS_LDM: // Local-dynamic
+ case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic
+ case elfcpp::R_386_TLS_IE: // Initial-exec
case elfcpp::R_386_TLS_IE_32:
+ case elfcpp::R_386_TLS_GOTIE:
+ case elfcpp::R_386_TLS_LE: // Local-exec
case elfcpp::R_386_TLS_LE_32:
- case elfcpp::R_386_TLS_GOTDESC:
- case elfcpp::R_386_TLS_DESC_CALL:
- r_type = Target_i386::optimize_tls_reloc(&options,
- !options.is_shared(),
- r_type);
- switch (r_type)
- {
- case elfcpp::R_386_TLS_LE:
- case elfcpp::R_386_TLS_LE_32:
- // FIXME: If generating a shared object, we need to copy
- // this relocation into the object.
- gold_assert(!options.is_shared());
- break;
+ {
+ bool output_is_shared = parameters->output_is_shared();
+ const tls::Tls_optimization optimized_type
+ = Target_i386::optimize_tls_reloc(!output_is_shared, r_type);
+ switch (r_type)
+ {
+ case elfcpp::R_386_TLS_GD: // Global-dynamic
+ case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva)
+ case elfcpp::R_386_TLS_DESC_CALL:
+ // FIXME: If not relaxing to LE, we need to generate
+ // DTPMOD32 and DTPOFF32 relocs.
+ if (optimized_type != tls::TLSOPT_TO_LE)
+ unsupported_reloc_local(object, r_type);
+ 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_32:
- case elfcpp::R_386_TLS_IE_32:
- case elfcpp::R_386_TLS_GOTDESC:
- case elfcpp::R_386_TLS_DESC_CALL:
- fprintf(stderr,
- _("%s: %s: unsupported reloc %u against local symbol\n"),
- program_name, object->name().c_str(), r_type);
- break;
- }
+ case elfcpp::R_386_TLS_LDM: // Local-dynamic
+ // FIXME: If not relaxing to LE, we need to generate a
+ // DTPMOD32 reloc.
+ if (optimized_type != tls::TLSOPT_TO_LE)
+ unsupported_reloc_local(object, r_type);
+ break;
+
+ case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic
+ break;
+
+ case elfcpp::R_386_TLS_IE: // Initial-exec
+ case elfcpp::R_386_TLS_IE_32:
+ case elfcpp::R_386_TLS_GOTIE:
+ // FIXME: If not relaxing to LE, we need to generate a
+ // TPOFF or TPOFF32 reloc.
+ if (optimized_type != tls::TLSOPT_TO_LE)
+ unsupported_reloc_local(object, r_type);
+ break;
+
+ case elfcpp::R_386_TLS_LE: // Local-exec
+ case elfcpp::R_386_TLS_LE_32:
+ // FIXME: If generating a shared object, we need to copy
+ // this relocation into the object.
+ gold_assert(!output_is_shared);
+ break;
+
+ default:
+ gold_unreachable();
+ }
+ }
break;
- case elfcpp::R_386_GOT32:
- case elfcpp::R_386_PLT32:
case elfcpp::R_386_32PLT:
case elfcpp::R_386_TLS_GD_32:
case elfcpp::R_386_TLS_GD_PUSH:
case elfcpp::R_386_TLS_LDM_POP:
case elfcpp::R_386_USED_BY_INTEL_200:
default:
- fprintf(stderr, _("%s: %s: unsupported reloc %u against local symbol\n"),
- program_name, object->name().c_str(), r_type);
+ unsupported_reloc_local(object, r_type);
break;
}
}
+// Report an unsupported relocation against a global symbol.
+
+void
+Target_i386::Scan::unsupported_reloc_global(Sized_relobj<32, false>* object,
+ unsigned int r_type,
+ Symbol* gsym)
+{
+ gold_error(_("%s: unsupported reloc %u against global symbol %s"),
+ object->name().c_str(), r_type, gsym->name());
+}
+
// Scan a relocation for a global symbol.
inline void
{
case elfcpp::R_386_NONE:
case elfcpp::R_386_GNU_VTINHERIT:
- case elfcpp::R_386_GNU_VTENTRY:
+ case elfcpp::R_386_GNU_VTENTRY:
break;
case elfcpp::R_386_32:
- case elfcpp::R_386_PC32:
case elfcpp::R_386_16:
- case elfcpp::R_386_PC16:
case elfcpp::R_386_8:
- case elfcpp::R_386_PC8:
- // FIXME: If we are generating a shared object we may need to
- // copy this relocation into the object. If this symbol is
- // defined in a shared object, we may need to copy this
- // relocation in order to avoid a COPY relocation.
- gold_assert(!options.is_shared());
-
- if (gsym->is_defined_in_dynobj())
- {
- // This symbol is defined in a dynamic object. If it is a
- // function, we make a PLT entry. Otherwise we need to
- // either generate a COPY reloc or copy this reloc.
- if (gsym->type() == elfcpp::STT_FUNC)
- target->make_plt_entry(&options, symtab, layout, gsym);
- else
- target->copy_reloc(&options, object, data_shndx, gsym, reloc);
- }
+ {
+ // Make a PLT entry if necessary.
+ if (gsym->needs_plt_entry())
+ {
+ target->make_plt_entry(symtab, layout, gsym);
+ // Since this is not a PC-relative relocation, we may be
+ // taking the address of a function. In that case we need to
+ // set the entry in the dynamic symbol table to the address of
+ // the PLT entry.
+ if (gsym->is_from_dynobj())
+ gsym->set_needs_dynsym_value();
+ }
+ // Make a dynamic relocation if necessary.
+ if (gsym->needs_dynamic_reloc(true, false))
+ {
+ if (target->may_need_copy_reloc(gsym))
+ {
+ target->copy_reloc(&options, symtab, layout, object, data_shndx,
+ gsym, reloc);
+ }
+ else if (r_type == elfcpp::R_386_32
+ && gsym->can_use_relative_reloc(false))
+ {
+ Reloc_section* rel_dyn = target->rel_dyn_section(layout);
+ rel_dyn->add_local(object, 0, elfcpp::R_386_RELATIVE, data_shndx,
+ reloc.get_r_offset());
+ }
+ else
+ {
+ Reloc_section* rel_dyn = target->rel_dyn_section(layout);
+ rel_dyn->add_global(gsym, r_type, object, data_shndx,
+ reloc.get_r_offset());
+ }
+ }
+ }
+ break;
+ case elfcpp::R_386_PC32:
+ case elfcpp::R_386_PC16:
+ case elfcpp::R_386_PC8:
+ {
+ // Make a PLT entry if necessary.
+ if (gsym->needs_plt_entry())
+ target->make_plt_entry(symtab, layout, gsym);
+ // Make a dynamic relocation if necessary.
+ bool is_function_call = (gsym->type() == elfcpp::STT_FUNC);
+ if (gsym->needs_dynamic_reloc(false, is_function_call))
+ {
+ if (target->may_need_copy_reloc(gsym))
+ {
+ target->copy_reloc(&options, symtab, layout, object, data_shndx,
+ gsym, reloc);
+ }
+ else
+ {
+ Reloc_section* rel_dyn = target->rel_dyn_section(layout);
+ rel_dyn->add_global(gsym, r_type, object, data_shndx,
+ reloc.get_r_offset());
+ }
+ }
+ }
break;
case elfcpp::R_386_GOT32:
- // The symbol requires a GOT entry.
- if (target->got_section(&options, symtab, layout)->add_global(gsym))
- {
- // If this symbol is not fully resolved, we need to add a
- // dynamic relocation for it.
- if (!gsym->final_value_is_known(&options))
- gold_unreachable();
- }
+ {
+ // The symbol requires a GOT entry.
+ Output_data_got<32, false>* got = target->got_section(symtab, layout);
+ if (got->add_global(gsym))
+ {
+ // If this symbol is not fully resolved, we need to add a
+ // dynamic relocation for it.
+ if (!gsym->final_value_is_known())
+ {
+ Reloc_section* rel_dyn = target->rel_dyn_section(layout);
+ if (gsym->is_from_dynobj()
+ || gsym->is_preemptible())
+ rel_dyn->add_global(gsym, elfcpp::R_386_GLOB_DAT, got,
+ gsym->got_offset());
+ else
+ {
+ rel_dyn->add_local(object, 0, elfcpp::R_386_RELATIVE,
+ got, gsym->got_offset());
+ // Make sure we write the link-time value to the GOT.
+ gsym->set_needs_value_in_got();
+ }
+ }
+ }
+ }
break;
case elfcpp::R_386_PLT32:
// If the symbol is fully resolved, this is just a PC32 reloc.
// Otherwise we need a PLT entry.
- if (gsym->final_value_is_known(&options))
+ if (gsym->final_value_is_known())
break;
- target->make_plt_entry(&options, symtab, layout, gsym);
+ // If building a shared library, we can also skip the PLT entry
+ // if the symbol is defined in the output file and is protected
+ // or hidden.
+ if (gsym->is_defined()
+ && !gsym->is_from_dynobj()
+ && !gsym->is_preemptible())
+ break;
+ target->make_plt_entry(symtab, layout, gsym);
break;
case elfcpp::R_386_GOTOFF:
case elfcpp::R_386_GOTPC:
// We need a GOT section.
- target->got_section(&options, symtab, layout);
+ target->got_section(symtab, layout);
break;
+ // These are relocations which should only be seen by the
+ // dynamic linker, and should never be seen here.
case elfcpp::R_386_COPY:
case elfcpp::R_386_GLOB_DAT:
case elfcpp::R_386_JUMP_SLOT:
case elfcpp::R_386_TLS_DTPOFF32:
case elfcpp::R_386_TLS_TPOFF32:
case elfcpp::R_386_TLS_DESC:
- fprintf(stderr, _("%s: %s: unexpected reloc %u in object file\n"),
- program_name, object->name().c_str(), r_type);
- gold_exit(false);
+ gold_error(_("%s: unexpected reloc %u in object file"),
+ object->name().c_str(), r_type);
break;
- 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_32:
+ // These are initial tls relocs, which are expected when
+ // linking.
+ case elfcpp::R_386_TLS_GD: // Global-dynamic
+ case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url)
+ case elfcpp::R_386_TLS_DESC_CALL:
+ case elfcpp::R_386_TLS_LDM: // Local-dynamic
+ case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic
+ case elfcpp::R_386_TLS_IE: // Initial-exec
case elfcpp::R_386_TLS_IE_32:
+ case elfcpp::R_386_TLS_GOTIE:
+ case elfcpp::R_386_TLS_LE: // Local-exec
case elfcpp::R_386_TLS_LE_32:
- case elfcpp::R_386_TLS_GOTDESC:
- case elfcpp::R_386_TLS_DESC_CALL:
{
- const bool is_final = gsym->final_value_is_known(&options);
- r_type = Target_i386::optimize_tls_reloc(&options, is_final, r_type);
+ const bool is_final = gsym->final_value_is_known();
+ const tls::Tls_optimization optimized_type
+ = Target_i386::optimize_tls_reloc(is_final, r_type);
switch (r_type)
{
- case elfcpp::R_386_TLS_LE:
+ case elfcpp::R_386_TLS_GD: // Global-dynamic
+ case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (~oliva url)
+ case elfcpp::R_386_TLS_DESC_CALL:
+ // FIXME: If not relaxing to LE, we need to generate
+ // DTPMOD32 and DTPOFF32 relocs.
+ if (optimized_type != tls::TLSOPT_TO_LE)
+ unsupported_reloc_global(object, r_type, gsym);
+ break;
+
+ case elfcpp::R_386_TLS_LDM: // Local-dynamic
+ // FIXME: If not relaxing to LE, we need to generate a
+ // DTPMOD32 reloc.
+ if (optimized_type != tls::TLSOPT_TO_LE)
+ unsupported_reloc_global(object, r_type, gsym);
+ break;
+
+ case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic
+ break;
+
+ case elfcpp::R_386_TLS_IE: // Initial-exec
+ case elfcpp::R_386_TLS_IE_32:
+ case elfcpp::R_386_TLS_GOTIE:
+ // FIXME: If not relaxing to LE, we need to generate a
+ // TPOFF or TPOFF32 reloc.
+ if (optimized_type != tls::TLSOPT_TO_LE)
+ unsupported_reloc_global(object, r_type, gsym);
+ break;
+
+ case elfcpp::R_386_TLS_LE: // Local-exec
case elfcpp::R_386_TLS_LE_32:
// FIXME: If generating a shared object, we need to copy
// this relocation into the object.
- gold_assert(!options.is_shared());
+ 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_32:
- case elfcpp::R_386_TLS_IE_32:
- case elfcpp::R_386_TLS_GOTDESC:
- case elfcpp::R_386_TLS_DESC_CALL:
- fprintf(stderr,
- _("%s: %s: unsupported reloc %u "
- "against global symbol %s\n"),
- program_name, object->name().c_str(), r_type,
- gsym->name());
- break;
+ default:
+ gold_unreachable();
}
}
break;
case elfcpp::R_386_TLS_LDM_POP:
case elfcpp::R_386_USED_BY_INTEL_200:
default:
- fprintf(stderr,
- _("%s: %s: unsupported reloc %u against global symbol %s\n"),
- program_name, object->name().c_str(), r_type, gsym->name());
+ unsupported_reloc_global(object, r_type, gsym);
break;
}
}
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,
- Symbol** global_symbols)
+ const unsigned char* plocal_symbols)
{
if (sh_type == elfcpp::SHT_RELA)
{
- fprintf(stderr, _("%s: %s: unsupported RELA reloc section\n"),
- program_name, object->name().c_str());
- gold_exit(false);
+ gold_error(_("%s: unsupported RELA reloc section"),
+ object->name().c_str());
+ return;
}
gold::scan_relocs<32, false, Target_i386, elfcpp::SHT_REL,
data_shndx,
prelocs,
reloc_count,
+ output_section,
+ needs_special_offset_handling,
local_symbol_count,
- plocal_symbols,
- global_symbols);
+ plocal_symbols);
+}
+
+// Finalize the sections.
+
+void
+Target_i386::do_finalize_sections(Layout* layout)
+{
+ // Fill in some more dynamic tags.
+ Output_data_dynamic* const odyn = layout->dynamic_data();
+ if (odyn != NULL)
+ {
+ if (this->got_plt_ != NULL)
+ odyn->add_section_address(elfcpp::DT_PLTGOT, this->got_plt_);
+
+ if (this->plt_ != NULL)
+ {
+ const Output_data* od = this->plt_->rel_plt();
+ odyn->add_section_size(elfcpp::DT_PLTRELSZ, od);
+ odyn->add_section_address(elfcpp::DT_JMPREL, od);
+ odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_REL);
+ }
+
+ if (this->rel_dyn_ != NULL)
+ {
+ const Output_data* od = this->rel_dyn_;
+ odyn->add_section_address(elfcpp::DT_REL, od);
+ odyn->add_section_size(elfcpp::DT_RELSZ, od);
+ odyn->add_constant(elfcpp::DT_RELENT,
+ elfcpp::Elf_sizes<32>::rel_size);
+ }
+
+ if (!parameters->output_is_shared())
+ {
+ // The value of the DT_DEBUG tag is filled in by the dynamic
+ // linker at run time, and used by the debugger.
+ odyn->add_constant(elfcpp::DT_DEBUG, 0);
+ }
+ }
+
+ // Emit any relocs we saved in an attempt to avoid generating COPY
+ // relocs.
+ if (this->copy_relocs_ == NULL)
+ return;
+ if (this->copy_relocs_->any_to_emit())
+ {
+ Reloc_section* rel_dyn = this->rel_dyn_section(layout);
+ this->copy_relocs_->emit(rel_dyn);
+ }
+ delete this->copy_relocs_;
+ this->copy_relocs_ = NULL;
+}
+
+// Return whether a direct absolute static relocation needs to be applied.
+// In cases where Scan::local() or Scan::global() has created
+// a dynamic relocation other than R_386_RELATIVE, the addend
+// of the relocation is carried in the data, and we must not
+// apply the static relocation.
+
+inline bool
+Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol<32>* gsym,
+ bool is_absolute_ref,
+ bool is_function_call,
+ bool is_32bit)
+{
+ // For local symbols, we will have created a non-RELATIVE dynamic
+ // relocation only if (a) the output is position independent,
+ // (b) the relocation is absolute (not pc- or segment-relative), and
+ // (c) the relocation is not 32 bits wide.
+ if (gsym == NULL)
+ return !(parameters->output_is_position_independent()
+ && is_absolute_ref
+ && !is_32bit);
+
+ // For global symbols, we use the same helper routines used in the scan pass.
+ return !(gsym->needs_dynamic_reloc(is_absolute_ref, is_function_call)
+ && !gsym->can_use_relative_reloc(is_function_call));
}
// Perform a relocation.
const elfcpp::Rel<32, false>& rel,
unsigned int r_type,
const Sized_symbol<32>* gsym,
- elfcpp::Elf_types<32>::Elf_Addr value,
+ const Symbol_value<32>* psymval,
unsigned char* view,
elfcpp::Elf_types<32>::Elf_Addr address,
off_t view_size)
if (r_type != elfcpp::R_386_PLT32
|| gsym == NULL
|| strcmp(gsym->name(), "___tls_get_addr") != 0)
+ gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
+ _("missing expected TLS relocation"));
+ else
{
- fprintf(stderr, _("%s: %s: missing expected TLS relocation\n"),
- program_name,
- relinfo->location(relnum, rel.get_r_offset()).c_str());
- gold_exit(false);
+ this->skip_call_tls_get_addr_ = false;
+ return false;
}
-
- this->skip_call_tls_get_addr_ = false;
-
- return false;
}
// Pick the value to use for symbols defined in shared objects.
- if (gsym != NULL && gsym->is_defined_in_dynobj())
+ Symbol_value<32> symval;
+ if (gsym != NULL
+ && (gsym->is_from_dynobj()
+ || (parameters->output_is_shared()
+ && gsym->is_preemptible()))
+ && gsym->has_plt_offset())
{
- if (gsym->has_plt_offset())
- address = target->plt_section()->address() + gsym->plt_offset();
+ symval.set_output_value(target->plt_section()->address()
+ + gsym->plt_offset());
+ psymval = &symval;
+ }
+
+ const Sized_relobj<32, false>* object = relinfo->object;
+
+ // Get the GOT offset if needed.
+ // The GOT pointer points to the end of the GOT section.
+ // 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;
+ switch (r_type)
+ {
+ case elfcpp::R_386_GOT32:
+ if (gsym != NULL)
+ {
+ gold_assert(gsym->has_got_offset());
+ got_offset = gsym->got_offset() - target->got_size();
+ }
else
- gold_unreachable();
+ {
+ unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info());
+ got_offset = object->local_got_offset(r_sym) - target->got_size();
+ }
+ have_got_offset = true;
+ break;
+
+ default:
+ break;
}
switch (r_type)
break;
case elfcpp::R_386_32:
- Relocate_functions<32, false>::rel32(view, value);
+ if (should_apply_static_reloc(gsym, true, false, true))
+ Relocate_functions<32, false>::rel32(view, object, psymval);
break;
case elfcpp::R_386_PC32:
- Relocate_functions<32, false>::pcrel32(view, value, address);
+ {
+ bool is_function_call = (gsym != NULL
+ && gsym->type() == elfcpp::STT_FUNC);
+ if (should_apply_static_reloc(gsym, false, is_function_call, true))
+ Relocate_functions<32, false>::pcrel32(view, object, psymval, address);
+ }
break;
case elfcpp::R_386_16:
- Relocate_functions<32, false>::rel16(view, value);
+ if (should_apply_static_reloc(gsym, true, false, false))
+ Relocate_functions<32, false>::rel16(view, object, psymval);
break;
case elfcpp::R_386_PC16:
- Relocate_functions<32, false>::pcrel16(view, value, address);
+ {
+ bool is_function_call = (gsym != NULL
+ && gsym->type() == elfcpp::STT_FUNC);
+ if (should_apply_static_reloc(gsym, false, is_function_call, false))
+ Relocate_functions<32, false>::pcrel32(view, object, psymval, address);
+ }
break;
case elfcpp::R_386_8:
- Relocate_functions<32, false>::rel8(view, value);
+ if (should_apply_static_reloc(gsym, true, false, false))
+ Relocate_functions<32, false>::rel8(view, object, psymval);
break;
case elfcpp::R_386_PC8:
- Relocate_functions<32, false>::pcrel8(view, value, address);
+ {
+ bool is_function_call = (gsym != NULL
+ && gsym->type() == elfcpp::STT_FUNC);
+ if (should_apply_static_reloc(gsym, false, is_function_call, false))
+ Relocate_functions<32, false>::pcrel32(view, object, psymval, address);
+ }
break;
case elfcpp::R_386_PLT32:
- gold_assert(gsym->has_plt_offset()
- || gsym->final_value_is_known(relinfo->options));
- Relocate_functions<32, false>::pcrel32(view, value, address);
+ gold_assert(gsym == NULL
+ || gsym->has_plt_offset()
+ || gsym->final_value_is_known());
+ Relocate_functions<32, false>::pcrel32(view, object, psymval, address);
break;
case elfcpp::R_386_GOT32:
- // Local GOT offsets not yet supported.
- gold_assert(gsym);
- gold_assert(gsym->has_got_offset());
- value = gsym->got_offset();
- Relocate_functions<32, false>::rel32(view, value);
+ gold_assert(have_got_offset);
+ Relocate_functions<32, false>::rel32(view, got_offset);
break;
case elfcpp::R_386_GOTOFF:
- value -= target->got_section(NULL, NULL, NULL)->address();
- Relocate_functions<32, false>::rel32(view, value);
+ {
+ elfcpp::Elf_types<32>::Elf_Addr value;
+ value = (psymval->value(object, 0)
+ - target->got_plt_section()->address());
+ Relocate_functions<32, false>::rel32(view, value);
+ }
break;
case elfcpp::R_386_GOTPC:
- value = target->got_section(NULL, NULL, NULL)->address();
- Relocate_functions<32, false>::pcrel32(view, value, address);
+ {
+ elfcpp::Elf_types<32>::Elf_Addr value;
+ value = target->got_plt_section()->address();
+ Relocate_functions<32, false>::pcrel32(view, value, address);
+ }
break;
case elfcpp::R_386_COPY:
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:
case elfcpp::R_386_TLS_TPOFF32:
case elfcpp::R_386_TLS_DESC:
- fprintf(stderr, _("%s: %s: unexpected reloc %u in object file\n"),
- program_name,
- relinfo->location(relnum, rel.get_r_offset()).c_str(),
- r_type);
- gold_exit(false);
+ gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
+ _("unexpected reloc %u in object file"),
+ r_type);
break;
- 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_32:
+ // These are initial tls relocs, which are expected when
+ // linking.
+ case elfcpp::R_386_TLS_GD: // Global-dynamic
+ case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url)
+ case elfcpp::R_386_TLS_DESC_CALL:
+ case elfcpp::R_386_TLS_LDM: // Local-dynamic
+ case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic
+ case elfcpp::R_386_TLS_IE: // Initial-exec
case elfcpp::R_386_TLS_IE_32:
+ case elfcpp::R_386_TLS_GOTIE:
+ case elfcpp::R_386_TLS_LE: // Local-exec
case elfcpp::R_386_TLS_LE_32:
- case elfcpp::R_386_TLS_GOTDESC:
- case elfcpp::R_386_TLS_DESC_CALL:
- this->relocate_tls(relinfo, relnum, rel, r_type, gsym, value, view,
+ this->relocate_tls(relinfo, relnum, rel, r_type, gsym, psymval, view,
address, view_size);
break;
case elfcpp::R_386_TLS_LDM_POP:
case elfcpp::R_386_USED_BY_INTEL_200:
default:
- fprintf(stderr, _("%s: %s: unsupported reloc %u\n"),
- program_name,
- relinfo->location(relnum, rel.get_r_offset()).c_str(),
- r_type);
- // gold_exit(false);
+ gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
+ _("unsupported reloc %u"),
+ r_type);
break;
}
const elfcpp::Rel<32, false>& rel,
unsigned int r_type,
const Sized_symbol<32>* gsym,
- elfcpp::Elf_types<32>::Elf_Addr value,
+ const Symbol_value<32>* psymval,
unsigned char* view,
elfcpp::Elf_types<32>::Elf_Addr,
off_t view_size)
Output_segment* tls_segment = relinfo->layout->tls_segment();
if (tls_segment == NULL)
{
- fprintf(stderr, _("%s: %s: TLS reloc but no TLS segment\n"),
- program_name,
- relinfo->location(relnum, rel.get_r_offset()).c_str());
- gold_exit(false);
+ gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
+ _("TLS reloc but no TLS segment"));
+ return;
}
+ elfcpp::Elf_types<32>::Elf_Addr value = psymval->value(relinfo->object, 0);
+
const bool is_final = (gsym == NULL
- ? !relinfo->options->is_shared()
- : gsym->final_value_is_known(relinfo->options));
- const unsigned int opt_r_type =
- Target_i386::optimize_tls_reloc(relinfo->options, is_final, r_type);
+ ? !parameters->output_is_position_independent()
+ : gsym->final_value_is_known());
+ const tls::Tls_optimization optimized_type
+ = Target_i386::optimize_tls_reloc(is_final, r_type);
switch (r_type)
{
- case elfcpp::R_386_TLS_LE_32:
- value = tls_segment->vaddr() + tls_segment->memsz() - value;
- Relocate_functions<32, false>::rel32(view, value);
+ case elfcpp::R_386_TLS_GD: // Global-dynamic
+ if (optimized_type == tls::TLSOPT_TO_LE)
+ {
+ this->tls_gd_to_le(relinfo, relnum, tls_segment,
+ rel, r_type, value, view,
+ view_size);
+ break;
+ }
+ gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
+ _("unsupported reloc %u"),
+ r_type);
break;
- case elfcpp::R_386_TLS_LE:
- value = value - (tls_segment->vaddr() + tls_segment->memsz());
+ case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url)
+ case elfcpp::R_386_TLS_DESC_CALL:
+ gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
+ _("unsupported reloc %u"),
+ r_type);
+ break;
+
+ case elfcpp::R_386_TLS_LDM: // Local-dynamic
+ if (this->local_dynamic_type_ == LOCAL_DYNAMIC_SUN)
+ {
+ gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
+ _("both SUN and GNU model "
+ "TLS relocations"));
+ break;
+ }
+ this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU;
+ if (optimized_type == tls::TLSOPT_TO_LE)
+ {
+ this->tls_ld_to_le(relinfo, relnum, tls_segment, rel, r_type,
+ value, view, view_size);
+ break;
+ }
+ gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
+ _("unsupported reloc %u"),
+ r_type);
+ break;
+
+ case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic
+ // This reloc can appear in debugging sections, in which case we
+ // won't see the TLS_LDM reloc. The local_dynamic_type field
+ // tells us this.
+ if (optimized_type != tls::TLSOPT_TO_LE
+ || this->local_dynamic_type_ == LOCAL_DYNAMIC_NONE)
+ value = value - tls_segment->vaddr();
+ else if (this->local_dynamic_type_ == LOCAL_DYNAMIC_GNU)
+ value = value - (tls_segment->vaddr() + tls_segment->memsz());
+ else
+ value = tls_segment->vaddr() + tls_segment->memsz() - value;
Relocate_functions<32, false>::rel32(view, value);
break;
- case elfcpp::R_386_TLS_IE:
+ case elfcpp::R_386_TLS_IE: // Initial-exec
case elfcpp::R_386_TLS_GOTIE:
case elfcpp::R_386_TLS_IE_32:
- if (opt_r_type == elfcpp::R_386_TLS_LE_32)
+ if (optimized_type == tls::TLSOPT_TO_LE)
{
Target_i386::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment,
rel, r_type, value, view,
view_size);
break;
}
- fprintf(stderr, _("%s: %s: unsupported reloc type %u\n"),
- program_name,
- relinfo->location(relnum, rel.get_r_offset()).c_str(),
- r_type);
- // gold_exit(false);
+ gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
+ _("unsupported reloc %u"),
+ r_type);
break;
- case elfcpp::R_386_TLS_GD:
- if (opt_r_type == elfcpp::R_386_TLS_LE_32)
- {
- this->tls_gd_to_le(relinfo, relnum, tls_segment,
- rel, r_type, value, view,
- view_size);
- break;
- }
- fprintf(stderr, _("%s: %s: unsupported reloc %u\n"),
- program_name,
- relinfo->location(relnum, rel.get_r_offset()).c_str(),
- r_type);
- // gold_exit(false);
+ case elfcpp::R_386_TLS_LE: // Local-exec
+ value = value - (tls_segment->vaddr() + tls_segment->memsz());
+ Relocate_functions<32, false>::rel32(view, value);
break;
- case elfcpp::R_386_TLS_LDM:
- case elfcpp::R_386_TLS_LDO_32:
- case elfcpp::R_386_TLS_GOTDESC:
- case elfcpp::R_386_TLS_DESC_CALL:
- fprintf(stderr, _("%s: %s: unsupported reloc %u\n"),
- program_name,
- relinfo->location(relnum, rel.get_r_offset()).c_str(),
- r_type);
- // gold_exit(false);
+ case elfcpp::R_386_TLS_LE_32:
+ value = tls_segment->vaddr() + tls_segment->memsz() - value;
+ Relocate_functions<32, false>::rel32(view, value);
break;
}
}
+// Do a relocation in which we convert a TLS General-Dynamic to a
+// Local-Exec.
+
+inline void
+Target_i386::Relocate::tls_gd_to_le(const Relocate_info<32, false>* relinfo,
+ size_t relnum,
+ Output_segment* tls_segment,
+ const elfcpp::Rel<32, false>& rel,
+ unsigned int,
+ elfcpp::Elf_types<32>::Elf_Addr value,
+ unsigned char* view,
+ off_t view_size)
+{
+ // 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
+ // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax
+
+ tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2);
+ tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9);
+
+ unsigned char op1 = view[-1];
+ unsigned char op2 = view[-2];
+
+ tls::check_tls(relinfo, relnum, rel.get_r_offset(),
+ op2 == 0x8d || op2 == 0x04);
+ tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8);
+
+ int roff = 5;
+
+ if (op2 == 0x04)
+ {
+ tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3);
+ tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d);
+ tls::check_tls(relinfo, relnum, rel.get_r_offset(),
+ ((op1 & 0xc7) == 0x05 && op1 != (4 << 3)));
+ memcpy(view - 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
+ }
+ else
+ {
+ tls::check_tls(relinfo, relnum, rel.get_r_offset(),
+ (op1 & 0xf8) == 0x80 && (op1 & 7) != 4);
+ 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);
+ roff = 6;
+ }
+ else
+ {
+ // Use the five byte subl.
+ memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
+ }
+ }
+
+ value = tls_segment->vaddr() + tls_segment->memsz() - value;
+ Relocate_functions<32, 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;
+}
+
+// Do a relocation in which we convert a TLS Local-Dynamic to a
+// Local-Exec.
+
+inline void
+Target_i386::Relocate::tls_ld_to_le(const Relocate_info<32, false>* relinfo,
+ size_t relnum,
+ Output_segment*,
+ const elfcpp::Rel<32, false>& rel,
+ unsigned int,
+ elfcpp::Elf_types<32>::Elf_Addr,
+ unsigned char* view,
+ off_t view_size)
+{
+ // leal foo(%reg), %eax; call ___tls_get_addr
+ // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi
+
+ tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2);
+ tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9);
+
+ // FIXME: Does this test really always pass?
+ tls::check_tls(relinfo, relnum, rel.get_r_offset(),
+ view[-2] == 0x8d && view[-1] == 0x83);
+
+ tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8);
+
+ memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11);
+
+ // The next reloc should be a PLT32 reloc against __tls_get_addr.
+ // We can skip it.
+ this->skip_call_tls_get_addr_ = true;
+}
+
// Do a relocation in which we convert a TLS Initial-Exec to a
// Local-Exec.
// movl %gs:XX,%eax ==> movl $YY,%eax
// movl %gs:XX,%reg ==> movl $YY,%reg
// addl %gs:XX,%reg ==> addl $YY,%reg
- Target_i386::Relocate::check_range(relinfo, relnum, rel, view_size, -1);
- Target_i386::Relocate::check_range(relinfo, relnum, rel, view_size, 4);
+ tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -1);
+ tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4);
unsigned char op1 = view[-1];
if (op1 == 0xa1)
}
else
{
- Target_i386::Relocate::check_range(relinfo, relnum, rel,
- view_size, -2);
+ tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2);
unsigned char op2 = view[-2];
if (op2 == 0x8b)
{
// movl XX,%reg ==> movl $YY,%reg
- Target_i386::Relocate::check_tls(relinfo, relnum, rel,
- (op1 & 0xc7) == 0x05);
+ tls::check_tls(relinfo, relnum, rel.get_r_offset(),
+ (op1 & 0xc7) == 0x05);
view[-2] = 0xc7;
view[-1] = 0xc0 | ((op1 >> 3) & 7);
}
else if (op2 == 0x03)
{
// addl XX,%reg ==> addl $YY,%reg
- Target_i386::Relocate::check_tls(relinfo, relnum, rel,
- (op1 & 0xc7) == 0x05);
+ tls::check_tls(relinfo, relnum, rel.get_r_offset(),
+ (op1 & 0xc7) == 0x05);
view[-2] = 0x81;
view[-1] = 0xc0 | ((op1 >> 3) & 7);
}
else
- Target_i386::Relocate::check_tls(relinfo, relnum, rel, 0);
+ tls::check_tls(relinfo, relnum, rel.get_r_offset(), 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_i386::Relocate::check_range(relinfo, relnum, rel, view_size, -2);
- Target_i386::Relocate::check_range(relinfo, relnum, rel, view_size, 4);
+ tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2);
+ tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4);
unsigned char op1 = view[-1];
unsigned char op2 = view[-2];
- Target_i386::Relocate::check_tls(relinfo, relnum, rel,
- (op1 & 0xc0) == 0x80 && (op1 & 7) != 4);
+ tls::check_tls(relinfo, relnum, rel.get_r_offset(),
+ (op1 & 0xc0) == 0x80 && (op1 & 7) != 4);
if (op2 == 0x8b)
{
// movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2
view[-1] = 0xc0 | ((op1 >> 3) & 7);
}
else
- Target_i386::Relocate::check_tls(relinfo, relnum, rel, 0);
+ tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0);
}
value = tls_segment->vaddr() + tls_segment->memsz() - value;
Relocate_functions<32, false>::rel32(view, value);
}
-// Do a relocation in which we convert a TLS Global-Dynamic to a
-// Local-Exec.
-
-inline void
-Target_i386::Relocate::tls_gd_to_le(const Relocate_info<32, false>* relinfo,
- size_t relnum,
- Output_segment* tls_segment,
- const elfcpp::Rel<32, false>& rel,
- unsigned int,
- elfcpp::Elf_types<32>::Elf_Addr value,
- unsigned char* view,
- off_t view_size)
-{
- // 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
- // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax
-
- Target_i386::Relocate::check_range(relinfo, relnum, rel, view_size, -2);
- Target_i386::Relocate::check_range(relinfo, relnum, rel, view_size, 9);
-
- unsigned char op1 = view[-1];
- unsigned char op2 = view[-2];
-
- Target_i386::Relocate::check_tls(relinfo, relnum, rel,
- op2 == 0x8d || op2 == 0x04);
- Target_i386::Relocate::check_tls(relinfo, relnum, rel,
- view[4] == 0xe8);
-
- int roff = 5;
-
- if (op2 == 0x04)
- {
- Target_i386::Relocate::check_range(relinfo, relnum, rel, view_size, -3);
- Target_i386::Relocate::check_tls(relinfo, relnum, rel,
- view[-3] == 0x8d);
- Target_i386::Relocate::check_tls(relinfo, relnum, rel,
- ((op1 & 0xc7) == 0x05
- && op1 != (4 << 3)));
- memcpy(view - 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
- }
- else
- {
- 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)
- {
- // 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);
- roff = 6;
- }
- else
- {
- // Use the five byte subl.
- memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
- }
- }
-
- value = tls_segment->vaddr() + tls_segment->memsz() - value;
- Relocate_functions<32, 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;
-}
-
-// Check the range for a TLS relocation.
-
-inline void
-Target_i386::Relocate::check_range(const Relocate_info<32, false>* relinfo,
- size_t relnum,
- const elfcpp::Rel<32, false>& rel,
- off_t view_size, off_t off)
-{
- off_t offset = rel.get_r_offset() + off;
- if (offset < 0 || offset > view_size)
- {
- fprintf(stderr, _("%s: %s: TLS relocation out of range\n"),
- program_name,
- relinfo->location(relnum, rel.get_r_offset()).c_str());
- gold_exit(false);
- }
-}
-
-// Check the validity of a TLS relocation. This is like assert.
-
-inline void
-Target_i386::Relocate::check_tls(const Relocate_info<32, false>* relinfo,
- size_t relnum,
- const elfcpp::Rel<32, false>& rel,
- bool valid)
-{
- if (!valid)
- {
- fprintf(stderr,
- _("%s: %s: TLS relocation against invalid instruction\n"),
- program_name,
- relinfo->location(relnum, rel.get_r_offset()).c_str());
- gold_exit(false);
- }
-}
-
// Relocate section data.
void
unsigned int sh_type,
const unsigned char* prelocs,
size_t reloc_count,
+ Output_section* output_section,
+ bool needs_special_offset_handling,
unsigned char* view,
elfcpp::Elf_types<32>::Elf_Addr address,
off_t view_size)
this,
prelocs,
reloc_count,
+ output_section,
+ needs_special_offset_handling,
view,
address,
view_size);
}
+// Return the value to use for a dynamic which requires special
+// treatment. This is how we support equality comparisons of function
+// pointers across shared library boundaries, as described in the
+// processor specific ABI supplement.
+
+uint64_t
+Target_i386::do_dynsym_value(const Symbol* gsym) const
+{
+ gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
+ return this->plt_section()->address() + gsym->plt_offset();
+}
+
+// Return a string used to fill a code section with nops to take up
+// the specified length.
+
+std::string
+Target_i386::do_code_fill(off_t length)
+{
+ if (length >= 16)
+ {
+ // Build a jmp instruction to skip over the bytes.
+ unsigned char jmp[5];
+ jmp[0] = 0xe9;
+ elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5);
+ return (std::string(reinterpret_cast<char*>(&jmp[0]), 5)
+ + std::string(length - 5, '\0'));
+ }
+
+ // Nop sequences of various lengths.
+ const char nop1[1] = { 0x90 }; // nop
+ const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax
+ const char nop3[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi
+ const char nop4[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi
+ const char nop5[5] = { 0x90, 0x8d, 0x74, 0x26, // nop
+ 0x00 }; // leal 0(%esi,1),%esi
+ const char nop6[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
+ 0x00, 0x00 };
+ const char nop7[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi
+ 0x00, 0x00, 0x00 };
+ const char nop8[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop
+ 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi
+ const char nop9[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi
+ 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi
+ 0x00 };
+ const char nop10[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi
+ 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi
+ 0x00, 0x00 };
+ const char nop11[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi
+ 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi
+ 0x00, 0x00, 0x00 };
+ const char nop12[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
+ 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi
+ 0x00, 0x00, 0x00, 0x00 };
+ const char nop13[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
+ 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi
+ 0x27, 0x00, 0x00, 0x00,
+ 0x00 };
+ const char nop14[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi
+ 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi
+ 0xbc, 0x27, 0x00, 0x00,
+ 0x00, 0x00 };
+ const char nop15[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15
+ 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,...
+ 0x90, 0x90, 0x90, 0x90,
+ 0x90, 0x90, 0x90 };
+
+ const char* nops[16] = {
+ NULL,
+ nop1, nop2, nop3, nop4, nop5, nop6, nop7,
+ nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15
+ };
+
+ return std::string(nops[length], length);
+}
+
// The selector for i386 object files.
class Target_selector_i386 : public Target_selector
projects / platform / upstream / binutils.git / blobdiff