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2009-05-28 Doug Kwan <dougkwan@google.com>

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* configure.ac: Support gold for target arm*-*-*.
        * configure: Regenerate.
        * gold/Makefile.am (TARGETSOURCES): Add arm.cc.
        (ALL_TARGETOBJECTS): Add arm.$(OBJEXT)
        * gold/Makefile.in: Regenerate.
        * gold/arm.cc: New file.
        * gold/configure.tgt: Add armbe*-*-*, armeb*-*-* and arm*-*-* targets.
This commit is contained in:
Doug Kwan 2009-05-29 00:15:12 +00:00
parent cc15404449
commit 4a657b0d92
8 changed files with 707 additions and 6 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2009-05-28 Doug Kwan <dougkwan@google.com>
* configure.ac: Support gold for target arm*-*-*.
* configure: Regenerate.
2009-05-27 Alexandre Oliva <aoliva@redhat.com>
* Makefile.tpl (all): Avoid harmless warning in make all when

2
configure vendored
View File

@ -2077,7 +2077,7 @@ if test "${ENABLE_GOLD}" = "yes"; then
if test "$is_elf" = "yes"; then
# Check for target supported by gold.
case "${target}" in
i?86-*-* | x86_64-*-* | sparc*-*-* | powerpc*-*-*)
i?86-*-* | x86_64-*-* | sparc*-*-* | powerpc*-*-* | arm*-*-*)
configdirs="`echo " ${configdirs} " | sed -e 's/ ld / gold /'`"
;;
esac

2
configure.ac
View File

@ -318,7 +318,7 @@ if test "${ENABLE_GOLD}" = "yes"; then
if test "$is_elf" = "yes"; then
# Check for target supported by gold.
case "${target}" in
i?86-*-* | x86_64-*-* | sparc*-*-* | powerpc*-*-*)
i?86-*-* | x86_64-*-* | sparc*-*-* | powerpc*-*-* | arm*-*-*)
configdirs="`echo " ${configdirs} " | sed -e 's/ ld / gold /'`"
;;
esac

8
gold/ChangeLog
View File

@ -1,3 +1,11 @@
2009-05-28 Doug Kwan <dougkwan@google.com>
* Makefile.am (TARGETSOURCES): Add arm.cc.
(ALL_TARGETOBJECTS): Add arm.$(OBJEXT)
* Makefile.in: Regenerate.
* arm.cc: New file.
* configure.tgt: Add armbe*-*-*, armeb*-*-* and arm*-*-* targets.
2009-05-26 Doug Kwan <dougkwan@google.com>
* options.cc (General_options::parse_exclude_libs). Fix a comment.

5
gold/Makefile.am
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@ -123,10 +123,11 @@ YFILES = \
EXTRA_DIST = yyscript.c yyscript.h
TARGETSOURCES = \
i386.cc x86_64.cc sparc.cc powerpc.cc
i386.cc x86_64.cc sparc.cc powerpc.cc arm.cc
ALL_TARGETOBJS = \
i386.$(OBJEXT) x86_64.$(OBJEXT) sparc.$(OBJEXT) powerpc.$(OBJEXT)
i386.$(OBJEXT) x86_64.$(OBJEXT) sparc.$(OBJEXT) powerpc.$(OBJEXT) \
arm.$(OBJEXT)
libgold_a_SOURCES = $(CCFILES) $(HFILES) $(YFILES)

5
gold/Makefile.in
View File

@ -406,10 +406,11 @@ YFILES = \
EXTRA_DIST = yyscript.c yyscript.h
TARGETSOURCES = \
i386.cc x86_64.cc sparc.cc powerpc.cc
i386.cc x86_64.cc sparc.cc powerpc.cc arm.cc
ALL_TARGETOBJS = \
i386.$(OBJEXT) x86_64.$(OBJEXT) sparc.$(OBJEXT) powerpc.$(OBJEXT)
i386.$(OBJEXT) x86_64.$(OBJEXT) sparc.$(OBJEXT) powerpc.$(OBJEXT) \
arm.$(OBJEXT)
libgold_a_SOURCES = $(CCFILES) $(HFILES) $(YFILES)
sources_var = main.cc

672
gold/arm.cc Normal file
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@ -0,0 +1,672 @@
// arm.cc -- arm target support for gold.
// Copyright 2009 Free Software Foundation, Inc.
// Written by Doug Kwan <dougkwan@google.com> based on the i386 code
// 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 <limits>
#include <cstdio>
#include <string>
#include "elfcpp.h"
#include "parameters.h"
#include "reloc.h"
#include "arm.h"
#include "object.h"
#include "symtab.h"
#include "layout.h"
#include "output.h"
#include "copy-relocs.h"
#include "target.h"
#include "target-reloc.h"
#include "target-select.h"
#include "tls.h"
#include "defstd.h"
namespace
{
using namespace gold;
// The arm target class.
//
// This is a very simple port of gold for ARM-EABI. It is intended for
// supporting Android only for the time being. Only these relocation types
// are supported.
//
// R_ARM_NONE
// R_ARM_ABS32
// R_ARM_REL32
// R_ARM_THM_CALL
// R_ARM_COPY
// R_ARM_GLOB_DAT
// R_ARM_BASE_PREL
// R_ARM_JUMP_SLOT
// R_ARM_RELATIVE
// R_ARM_GOTOFF32
// R_ARM_GOT_BREL
// R_ARM_PLT32
// R_ARM_CALL
// R_ARM_JUMP24
// R_ARM_TARGET1
// R_ARM_PREL31
//
// Coming soon (pending patches):
// - Support for dynamic symbols (GOT, PLT and etc).
// - Local scanner
// - Global scanner
// - Relocation
// - Defining section symbols __exidx_start and __exidx_stop.
// - Support interworking.
// - Mergeing all .ARM.xxx.yyy sections into .ARM.xxx. Currently, they
// are incorrectly merged into an .ARM section.
//
// TODOs:
// - Create a PT_ARM_EXIDX program header for a shared object that
// might throw an exception.
// - Support more relocation types as needed.
template<bool big_endian>
class Target_arm : public Sized_target<32, big_endian>
{
public:
typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, big_endian>
Reloc_section;
Target_arm()
: Sized_target<32, big_endian>(&arm_info)
{ }
// Process the relocations to determine unreferenced sections for
// garbage collection.
void
gc_process_relocs(const General_options& options,
Symbol_table* symtab,
Layout* layout,
Sized_relobj<32, big_endian>* 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);
// Scan the relocations to look for symbol adjustments.
void
scan_relocs(const General_options& options,
Symbol_table* symtab,
Layout* layout,
Sized_relobj<32, big_endian>* 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);
// 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;
// Relocate a section.
void
relocate_section(const Relocate_info<32, big_endian>*,
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,
section_size_type view_size);
// Scan the relocs during a relocatable link.
void
scan_relocatable_relocs(const General_options& options,
Symbol_table* symtab,
Layout* layout,
Sized_relobj<32, big_endian>* 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*);
// Relocate a section during a relocatable link.
void
relocate_for_relocatable(const Relocate_info<32, big_endian>*,
unsigned int sh_type,
const unsigned char* prelocs,
size_t reloc_count,
Output_section* output_section,
off_t offset_in_output_section,
const Relocatable_relocs*,
unsigned char* view,
elfcpp::Elf_types<32>::Elf_Addr view_address,
section_size_type view_size,
unsigned char* reloc_view,
section_size_type reloc_view_size);
// Return whether SYM is defined by the ABI.
bool
do_is_defined_by_abi(Symbol* sym) const
{ return strcmp(sym->name(), "__tls_get_addr") == 0; }
// Map platform-specific reloc types
static unsigned int
get_real_reloc_type (unsigned int r_type);
private:
// The class which scans relocations.
class Scan
{
public:
Scan()
{ }
inline void
local(const General_options& options, Symbol_table* symtab,
Layout* layout, Target_arm* target,
Sized_relobj<32, big_endian>* object,
unsigned int data_shndx,
Output_section* output_section,
const elfcpp::Rel<32, big_endian>& reloc, unsigned int r_type,
const elfcpp::Sym<32, big_endian>& lsym);
inline void
global(const General_options& options, Symbol_table* symtab,
Layout* layout, Target_arm* target,
Sized_relobj<32, big_endian>* object,
unsigned int data_shndx,
Output_section* output_section,
const elfcpp::Rel<32, big_endian>& reloc, unsigned int r_type,
Symbol* gsym);
private:
static void
unsupported_reloc_local(Sized_relobj<32, big_endian>*,
unsigned int r_type);
static void
unsupported_reloc_global(Sized_relobj<32, big_endian>*,
unsigned int r_type, Symbol*);
};
// The class which implements relocation.
class Relocate
{
public:
Relocate()
{ }
~Relocate()
{ }
// Do a relocation. Return false if the caller should not issue
// any warnings about this relocation.
inline bool
relocate(const Relocate_info<32, big_endian>*, Target_arm*,
Output_section*, size_t relnum,
const elfcpp::Rel<32, big_endian>&,
unsigned int r_type, const Sized_symbol<32>*,
const Symbol_value<32>*,
unsigned char*, elfcpp::Elf_types<32>::Elf_Addr,
section_size_type);
};
// A class which returns the size required for a relocation type,
// used while scanning relocs during a relocatable link.
class Relocatable_size_for_reloc
{
public:
unsigned int
get_size_for_reloc(unsigned int, Relobj*);
};
// Information about this specific target which we pass to the
// general Target structure.
static const Target::Target_info arm_info;
};
template<bool big_endian>
const Target::Target_info Target_arm<big_endian>::arm_info =
{
32, // size
big_endian, // is_big_endian
elfcpp::EM_ARM, // machine_code
false, // has_make_symbol
false, // has_resolve
false, // has_code_fill
true, // is_default_stack_executable
'\0', // wrap_char
"/usr/lib/libc.so.1", // dynamic_linker
0x8000, // default_text_segment_address
0x1000, // abi_pagesize (overridable by -z max-page-size)
0x1000 // common_pagesize (overridable by -z common-page-size)
};
// Report an unsupported relocation against a local symbol.
template<bool big_endian>
void
Target_arm<big_endian>::Scan::unsupported_reloc_local(
Sized_relobj<32, big_endian>* 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.
template<bool big_endian>
inline void
Target_arm<big_endian>::Scan::local(const General_options&,
Symbol_table* /* symtab */,
Layout* /* layout */,
Target_arm* /* target */,
Sized_relobj<32, big_endian>* object,
unsigned int /* data_shndx */,
Output_section* /* output_section */,
const elfcpp::Rel<32, big_endian>& /* reloc */,
unsigned int r_type,
const elfcpp::Sym<32, big_endian>&)
{
r_type = get_real_reloc_type(r_type);
switch (r_type)
{
case elfcpp::R_ARM_NONE:
break;
default:
unsupported_reloc_local(object, r_type);
break;
}
}
// Report an unsupported relocation against a global symbol.
template<bool big_endian>
void
Target_arm<big_endian>::Scan::unsupported_reloc_global(
Sized_relobj<32, big_endian>* object,
unsigned int r_type,
Symbol* gsym)
{
gold_error(_("%s: unsupported reloc %u against global symbol %s"),
object->name().c_str(), r_type, gsym->demangled_name().c_str());
}
// Scan a relocation for a global symbol.
template<bool big_endian>
inline void
Target_arm<big_endian>::Scan::global(const General_options&,
Symbol_table* /* symtab */,
Layout* /* layout */,
Target_arm* /* target */,
Sized_relobj<32, big_endian>* object,
unsigned int /* data_shndx */,
Output_section* /* output_section */,
const elfcpp::Rel<32, big_endian>& /* reloc */,
unsigned int r_type,
Symbol* gsym)
{
r_type = get_real_reloc_type(r_type);
switch (r_type)
{
case elfcpp::R_ARM_NONE:
break;
default:
unsupported_reloc_global(object, r_type, gsym);
break;
}
}
// Process relocations for gc.
template<bool big_endian>
void
Target_arm<big_endian>::gc_process_relocs(const General_options& options,
Symbol_table* symtab,
Layout* layout,
Sized_relobj<32, big_endian>* object,
unsigned int data_shndx,
unsigned int,
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)
{
typedef Target_arm<big_endian> Arm;
typedef typename Target_arm<big_endian>::Scan Scan;
gold::gc_process_relocs<32, big_endian, Arm, elfcpp::SHT_REL, Scan>(
options,
symtab,
layout,
this,
object,
data_shndx,
prelocs,
reloc_count,
output_section,
needs_special_offset_handling,
local_symbol_count,
plocal_symbols);
}
// Scan relocations for a section.
template<bool big_endian>
void
Target_arm<big_endian>::scan_relocs(const General_options& options,
Symbol_table* symtab,
Layout* layout,
Sized_relobj<32, big_endian>* 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)
{
typedef typename Target_arm<big_endian>::Scan Scan;
if (sh_type == elfcpp::SHT_RELA)
{
gold_error(_("%s: unsupported RELA reloc section"),
object->name().c_str());
return;
}
gold::scan_relocs<32, big_endian, Target_arm, elfcpp::SHT_REL, Scan>(
options,
symtab,
layout,
this,
object,
data_shndx,
prelocs,
reloc_count,
output_section,
needs_special_offset_handling,
local_symbol_count,
plocal_symbols);
}
// Finalize the sections.
template<bool big_endian>
void
Target_arm<big_endian>::do_finalize_sections(Layout* /* layout */)
{
gold_unreachable ();
}
// Perform a relocation.
template<bool big_endian>
inline bool
Target_arm<big_endian>::Relocate::relocate(
const Relocate_info<32, big_endian>* /* relinfo */,
Target_arm* /* target */,
Output_section* /* output_section */,
size_t /* relnum */,
const elfcpp::Rel<32, big_endian>& /* rel */,
unsigned int r_type,
const Sized_symbol<32>* /* gsym */,
const Symbol_value<32>* /* psymval */,
unsigned char* /* view */,
elfcpp::Elf_types<32>::Elf_Addr /* address */,
section_size_type /* view_size */ )
{
switch (r_type)
{
case elfcpp::R_ARM_NONE:
break;
default:
gold_unreachable();
}
return true;
}
// Relocate section data.
template<bool big_endian>
void
Target_arm<big_endian>::relocate_section(
const Relocate_info<32, big_endian>* relinfo,
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,
section_size_type view_size)
{
typedef typename Target_arm<big_endian>::Relocate Arm_relocate;
gold_assert(sh_type == elfcpp::SHT_REL);
gold::relocate_section<32, big_endian, Target_arm, elfcpp::SHT_REL,
Arm_relocate>(
relinfo,
this,
prelocs,
reloc_count,
output_section,
needs_special_offset_handling,
view,
address,
view_size);
}
// Return the size of a relocation while scanning during a relocatable
// link.
template<bool big_endian>
unsigned int
Target_arm<big_endian>::Relocatable_size_for_reloc::get_size_for_reloc(
unsigned int r_type,
Relobj* object)
{
r_type = get_real_reloc_type(r_type);
switch (r_type)
{
case elfcpp::R_ARM_NONE:
return 0;
case elfcpp::R_ARM_ABS32:
case elfcpp::R_ARM_REL32:
case elfcpp::R_ARM_THM_CALL:
case elfcpp::R_ARM_GOTOFF32:
case elfcpp::R_ARM_BASE_PREL:
case elfcpp::R_ARM_GOT_BREL:
case elfcpp::R_ARM_PLT32:
case elfcpp::R_ARM_CALL:
case elfcpp::R_ARM_JUMP24:
case elfcpp::R_ARM_PREL31:
return 4;
case elfcpp::R_ARM_TARGET1:
// This should have been mapped to another type already.
// Fall through.
case elfcpp::R_ARM_COPY:
case elfcpp::R_ARM_GLOB_DAT:
case elfcpp::R_ARM_JUMP_SLOT:
case elfcpp::R_ARM_RELATIVE:
// These are relocations which should only be seen by the
// dynamic linker, and should never be seen here.
gold_error(_("%s: unexpected reloc %u in object file"),
object->name().c_str(), r_type);
return 0;
default:
object->error(_("unsupported reloc %u in object file"), r_type);
return 0;
}
}
// Scan the relocs during a relocatable link.
template<bool big_endian>
void
Target_arm<big_endian>::scan_relocatable_relocs(
const General_options& options,
Symbol_table* symtab,
Layout* layout,
Sized_relobj<32, big_endian>* 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)
{
gold_assert(sh_type == elfcpp::SHT_REL);
typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_REL,
Relocatable_size_for_reloc> Scan_relocatable_relocs;
gold::scan_relocatable_relocs<32, big_endian, elfcpp::SHT_REL,
Scan_relocatable_relocs>(
options,
symtab,
layout,
object,
data_shndx,
prelocs,
reloc_count,
output_section,
needs_special_offset_handling,
local_symbol_count,
plocal_symbols,
rr);
}
// Relocate a section during a relocatable link.
template<bool big_endian>
void
Target_arm<big_endian>::relocate_for_relocatable(
const Relocate_info<32, big_endian>* relinfo,
unsigned int sh_type,
const unsigned char* prelocs,
size_t reloc_count,
Output_section* output_section,
off_t offset_in_output_section,
const Relocatable_relocs* rr,
unsigned char* view,
elfcpp::Elf_types<32>::Elf_Addr view_address,
section_size_type view_size,
unsigned char* reloc_view,
section_size_type reloc_view_size)
{
gold_assert(sh_type == elfcpp::SHT_REL);
gold::relocate_for_relocatable<32, big_endian, elfcpp::SHT_REL>(
relinfo,
prelocs,
reloc_count,
output_section,
offset_in_output_section,
rr,
view,
view_address,
view_size,
reloc_view,
reloc_view_size);
}
template<bool big_endian>
uint64_t
Target_arm<big_endian>::do_dynsym_value(const Symbol* /*gsym*/) const
{
gold_unreachable ();
return 0;
}
// Map platform-specific relocs to real relocs
//
template<bool big_endian>
unsigned int
Target_arm<big_endian>::get_real_reloc_type (unsigned int r_type)
{
switch (r_type)
{
case elfcpp::R_ARM_TARGET1:
// This is either R_ARM_ABS32 or R_ARM_REL32;
return elfcpp::R_ARM_ABS32;
case elfcpp::R_ARM_TARGET2:
// This can be any reloc type but ususally is R_ARM_GOT_PREL
return elfcpp::R_ARM_GOT_PREL;
default:
return r_type;
}
}
// The selector for arm object files.
template<bool big_endian>
class Target_selector_arm : public Target_selector
{
public:
Target_selector_arm()
: Target_selector(elfcpp::EM_ARM, 32, big_endian,
(big_endian ? "elf32-bigarm" : "elf32-littlearm"))
{ }
Target*
do_instantiate_target()
{ return new Target_arm<big_endian>(); }
};
Target_selector_arm<false> target_selector_arm;
Target_selector_arm<true> target_selector_armbe;
} // End anonymous namespace.

14
gold/configure.tgt
View File

@ -104,6 +104,20 @@ powerpc64-*)
targ_big_endian=true
targ_extra_big_endian=false
;;
armeb*-*-*|armbe*-*-*)
targ_obj=arm
targ_machine=EM_ARM
targ_size=32
targ_big_endian=true
targ_extra_big_endian=false
;;
arm*-*-*)
targ_obj=arm
targ_machine=EM_ARM
targ_size=32
targ_big_endian=false
targ_extra_big_endian=true
;;
*)
targ_obj=UNKNOWN
;;