// powerpc.cc -- powerpc target support for gold.
-// Copyright 2008 Free Software Foundation, Inc.
+// Copyright 2008, 2009 Free Software Foundation, Inc.
// Written by David S. Miller <davem@davemloft.net>
// and David Edelsohn <edelsohn@gnu.org>
#include "target-select.h"
#include "tls.h"
#include "errors.h"
+#include "gc.h"
namespace
{
{
}
+ // Process the relocations to determine unreferenced sections for
+ // garbage collection.
+ void
+ gc_process_relocs(Symbol_table* symtab,
+ Layout* layout,
+ Sized_relobj<size, 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,
+ scan_relocs(Symbol_table* symtab,
Layout* layout,
Sized_relobj<size, big_endian>* object,
unsigned int data_shndx,
const unsigned char* plocal_symbols);
// Finalize the sections.
void
- do_finalize_sections(Layout*);
+ do_finalize_sections(Layout*, const Input_objects*, Symbol_table*);
// Return the value to use for a dynamic which requires special
// treatment.
bool needs_special_offset_handling,
unsigned char* view,
typename elfcpp::Elf_types<size>::Elf_Addr view_address,
- section_size_type view_size);
+ section_size_type view_size,
+ const Reloc_symbol_changes*);
// Scan the relocs during a relocatable link.
void
- scan_relocatable_relocs(const General_options& options,
- Symbol_table* symtab,
+ scan_relocatable_relocs(Symbol_table* symtab,
Layout* layout,
Sized_relobj<size, big_endian>* object,
unsigned int data_shndx,
// Return whether SYM is defined by the ABI.
bool
- do_is_defined_by_abi(Symbol* sym) const
+ do_is_defined_by_abi(const Symbol* sym) const
{
return strcmp(sym->name(), "___tls_get_addr") == 0;
}
{ }
inline void
- local(const General_options& options, Symbol_table* symtab,
- Layout* layout, Target_powerpc* target,
+ local(Symbol_table* symtab, Layout* layout, Target_powerpc* target,
Sized_relobj<size, big_endian>* object,
unsigned int data_shndx,
Output_section* output_section,
const elfcpp::Sym<size, big_endian>& lsym);
inline void
- global(const General_options& options, Symbol_table* symtab,
- Layout* layout, Target_powerpc* target,
+ global(Symbol_table* symtab, Layout* layout, Target_powerpc* target,
Sized_relobj<size, big_endian>* object,
unsigned int data_shndx,
Output_section* output_section,
// any warnings about this relocation.
inline bool
relocate(const Relocate_info<size, big_endian>*, Target_powerpc*,
- size_t relnum, const elfcpp::Rela<size, big_endian>&,
+ Output_section*, size_t relnum,
+ const elfcpp::Rela<size, big_endian>&,
unsigned int r_type, const Sized_symbol<size>*,
const Symbol_value<size>*,
unsigned char*,
Reloc_section*
rela_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->options().shared()
- && gsym->is_from_dynobj()
- && gsym->type() != elfcpp::STT_FUNC);
- }
-
// Copy a relocation against a global symbol.
void
- copy_reloc(Symbol_table* symtab, Layout* layout, Relobj* object,
+ copy_reloc(Symbol_table* symtab, Layout* layout,
+ Sized_relobj<size, big_endian>* object,
unsigned int shndx, Output_section* output_section,
Symbol* sym, const elfcpp::Rela<size, big_endian>& reloc)
{
"/usr/lib/ld.so.1", // dynamic_linker
0x10000000, // default_text_segment_address
64 * 1024, // abi_pagesize (overridable by -z max-page-size)
- 4 * 1024 // common_pagesize (overridable by -z common-page-size)
+ 4 * 1024, // common_pagesize (overridable by -z common-page-size)
+ elfcpp::SHN_UNDEF, // small_common_shndx
+ elfcpp::SHN_UNDEF, // large_common_shndx
+ 0, // small_common_section_flags
+ 0, // large_common_section_flags
+ NULL, // attributes_section
+ NULL // attributes_vendor
};
template<>
"/usr/lib/ld.so.1", // dynamic_linker
0x10000000, // default_text_segment_address
64 * 1024, // abi_pagesize (overridable by -z max-page-size)
- 4 * 1024 // common_pagesize (overridable by -z common-page-size)
+ 4 * 1024, // common_pagesize (overridable by -z common-page-size)
+ elfcpp::SHN_UNDEF, // small_common_shndx
+ elfcpp::SHN_UNDEF, // large_common_shndx
+ 0, // small_common_section_flags
+ 0, // large_common_section_flags
+ NULL, // attributes_section
+ NULL // attributes_vendor
};
template<>
"/usr/lib/ld.so.1", // dynamic_linker
0x10000000, // default_text_segment_address
64 * 1024, // abi_pagesize (overridable by -z max-page-size)
- 8 * 1024 // common_pagesize (overridable by -z common-page-size)
+ 8 * 1024, // common_pagesize (overridable by -z common-page-size)
+ elfcpp::SHN_UNDEF, // small_common_shndx
+ elfcpp::SHN_UNDEF, // large_common_shndx
+ 0, // small_common_section_flags
+ 0, // large_common_section_flags
+ NULL, // attributes_section
+ NULL // attributes_vendor
};
template<>
"/usr/lib/ld.so.1", // dynamic_linker
0x10000000, // default_text_segment_address
64 * 1024, // abi_pagesize (overridable by -z max-page-size)
- 8 * 1024 // common_pagesize (overridable by -z common-page-size)
+ 8 * 1024, // common_pagesize (overridable by -z common-page-size)
+ elfcpp::SHN_UNDEF, // small_common_shndx
+ elfcpp::SHN_UNDEF, // large_common_shndx
+ 0, // small_common_section_flags
+ 0, // large_common_section_flags
+ NULL, // attributes_section
+ NULL // attributes_vendor
};
template<int size, bool big_endian>
typename elfcpp::Elf_types<size>::Elf_Addr value,
typename elfcpp::Elf_types<size>::Elf_Addr addend)
{
- typedef typename elfcpp::Swap<16, true>::Valtype Valtype;
- Valtype* wv = reinterpret_cast<Valtype*>(view);
- Valtype val = elfcpp::Swap<16, true>::readval(wv);
typename elfcpp::Elf_types<size>::Elf_Addr reloc;
reloc = value + addend;
reloc += 0x10000;
reloc >>= 16;
- val &= ~0xffff;
- reloc &= 0xffff;
-
- elfcpp::Swap<16, true>::writeval(wv, val | reloc);
+ elfcpp::Swap<16, big_endian>::writeval(view, reloc);
}
static inline void
const Symbol_value<size>* psymval,
typename elfcpp::Elf_types<size>::Elf_Addr addend)
{
- typedef typename elfcpp::Swap<16, true>::Valtype Valtype;
- Valtype* wv = reinterpret_cast<Valtype*>(view);
- Valtype val = elfcpp::Swap<16, true>::readval(wv);
typename elfcpp::Elf_types<size>::Elf_Addr reloc;
reloc = psymval->value(object, addend);
reloc += 0x10000;
reloc >>= 16;
- val &= ~0xffff;
- reloc &= 0xffff;
-
- elfcpp::Swap<16, true>::writeval(wv, val | reloc);
+ elfcpp::Swap<16, big_endian>::writeval(view, reloc);
}
// R_PPC_REL16: (Symbol + Addend - Address) & 0xffff
typename elfcpp::Elf_types<size>::Elf_Addr addend,
typename elfcpp::Elf_types<size>::Elf_Addr address)
{
- typedef typename elfcpp::Swap<16, true>::Valtype Valtype;
- Valtype* wv = reinterpret_cast<Valtype*>(view);
- Valtype val = elfcpp::Swap<16, true>::readval(wv);
typename elfcpp::Elf_types<size>::Elf_Addr reloc;
reloc = (psymval->value(object, addend) - address);
reloc += 0x10000;
reloc >>= 16;
- val &= ~0xffff;
- reloc &= 0xffff;
-
- elfcpp::Swap<16, true>::writeval(wv, val | reloc);
+ elfcpp::Swap<16, big_endian>::writeval(view, reloc);
}
};
layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
- this->got_);
+ this->got_, false);
// Create the GOT2 or TOC in the .got section.
if (size == 32)
layout->add_output_section_data(".got2", elfcpp::SHT_PROGBITS,
elfcpp::SHF_ALLOC
| elfcpp::SHF_WRITE,
- this->got2_);
+ this->got2_, false);
}
else
{
layout->add_output_section_data(".toc", elfcpp::SHT_PROGBITS,
elfcpp::SHF_ALLOC
| elfcpp::SHF_WRITE,
- this->toc_);
+ this->toc_, false);
}
// Define _GLOBAL_OFFSET_TABLE_ at the start of the .got section.
gold_assert(layout != NULL);
this->rela_dyn_ = new Reloc_section(parameters->options().combreloc());
layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
- elfcpp::SHF_ALLOC, this->rela_dyn_);
+ elfcpp::SHF_ALLOC, this->rela_dyn_, true);
}
return this->rela_dyn_;
}
{
this->rel_ = new Reloc_section(false);
layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
- elfcpp::SHF_ALLOC, this->rel_);
+ elfcpp::SHF_ALLOC, this->rel_, true);
}
template<int size, bool big_endian>
void
Output_data_plt_powerpc<size, big_endian>::do_write(Output_file* of)
{
- const off_t offset = this->offset();
+ const off_t off = this->offset();
const section_size_type oview_size =
convert_to_section_size_type(this->data_size());
- unsigned char* const oview = of->get_output_view(offset, oview_size);
+ unsigned char* const oview = of->get_output_view(off, oview_size);
unsigned char* pov = oview;
memset(pov, 0, base_plt_entry_size * 4);
lwz_11_30 + plt_offset);
elfcpp::Swap<32, true>::writeval(pov + 0x04, mtctr_11);
elfcpp::Swap<32, true>::writeval(pov + 0x08, bctr);
- elfcpp::Swap<32, true>::writeval(pov + 0x0b, nop);
+ elfcpp::Swap<32, true>::writeval(pov + 0x0c, nop);
pov += base_plt_entry_size;
plt_offset += base_plt_entry_size;
}
gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
- of->write_output_view(offset, oview_size, oview);
+ of->write_output_view(off, oview_size, oview);
}
// Create a PLT entry for a global symbol.
(elfcpp::SHF_ALLOC
| elfcpp::SHF_EXECINSTR
| elfcpp::SHF_WRITE),
- this->plt_);
+ this->plt_, false);
// Define _PROCEDURE_LINKAGE_TABLE_ at the start of the .plt section.
symtab->define_in_output_data("_PROCEDURE_LINKAGE_TABLE_", NULL,
// error per object file.
if (this->issued_non_pic_error_)
return;
+ gold_assert(parameters->options().output_is_position_independent());
object->error(_("requires unsupported dynamic reloc; "
"recompile with -fPIC"));
this->issued_non_pic_error_ = true;
template<int size, bool big_endian>
inline void
Target_powerpc<size, big_endian>::Scan::local(
- const General_options&,
Symbol_table* symtab,
Layout* layout,
Target_powerpc<size, big_endian>* target,
template<int size, bool big_endian>
inline void
Target_powerpc<size, big_endian>::Scan::global(
- const General_options&,
Symbol_table* symtab,
Layout* layout,
Target_powerpc<size, big_endian>* target,
// Make a dynamic relocation if necessary.
if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF))
{
- if (target->may_need_copy_reloc(gsym))
+ if (gsym->may_need_copy_reloc())
{
target->copy_reloc(symtab, layout, object,
data_shndx, output_section, gsym, reloc);
flags |= Symbol::FUNCTION_CALL;
if (gsym->needs_dynamic_reloc(flags))
{
- if (target->may_need_copy_reloc(gsym))
+ if (gsym->may_need_copy_reloc())
{
target->copy_reloc(symtab, layout, object,
data_shndx, output_section, gsym,
}
}
+// Process relocations for gc.
+
+template<int size, bool big_endian>
+void
+Target_powerpc<size, big_endian>::gc_process_relocs(
+ Symbol_table* symtab,
+ Layout* layout,
+ Sized_relobj<size, 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_powerpc<size, big_endian> Powerpc;
+ typedef typename Target_powerpc<size, big_endian>::Scan scan;
+
+ gold::gc_process_relocs<size, big_endian, Powerpc, elfcpp::SHT_RELA, scan>(
+ 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<int size, bool big_endian>
void
Target_powerpc<size, big_endian>::scan_relocs(
- const General_options& options,
Symbol_table* symtab,
Layout* layout,
Sized_relobj<size, big_endian>* object,
const unsigned char* plocal_symbols)
{
typedef Target_powerpc<size, big_endian> Powerpc;
- typedef typename Target_powerpc<size, big_endian>::Scan Scan;
+ typedef typename Target_powerpc<size, big_endian>::Scan scan;
static Output_data_space* sdata;
if (sh_type == elfcpp::SHT_REL)
Output_section* os = layout->add_output_section_data(".sdata", 0,
elfcpp::SHF_ALLOC
| elfcpp::SHF_WRITE,
- sdata);
+ sdata, false);
symtab->define_in_output_data("_SDA_BASE_", NULL,
os,
32768, 0,
false, false);
}
- gold::scan_relocs<size, big_endian, Powerpc, elfcpp::SHT_RELA, Scan>(
- options,
+ gold::scan_relocs<size, big_endian, Powerpc, elfcpp::SHT_RELA, scan>(
symtab,
layout,
this,
template<int size, bool big_endian>
void
-Target_powerpc<size, big_endian>::do_finalize_sections(Layout* layout)
+Target_powerpc<size, big_endian>::do_finalize_sections(
+ Layout* layout,
+ const Input_objects*,
+ Symbol_table*)
{
// Fill in some more dynamic tags.
Output_data_dynamic* const odyn = layout->dynamic_data();
if (odyn != NULL)
{
- if (this->plt_ != NULL)
+ if (this->plt_ != NULL
+ && this->plt_->output_section() != NULL)
{
const Output_data* od = this->plt_->rel_plt();
odyn->add_section_size(elfcpp::DT_PLTRELSZ, od);
odyn->add_section_address(elfcpp::DT_PLTGOT, this->plt_);
}
- if (this->rela_dyn_ != NULL)
+ if (this->rela_dyn_ != NULL
+ && this->rela_dyn_->output_section() != NULL)
{
const Output_data* od = this->rela_dyn_;
odyn->add_section_address(elfcpp::DT_RELA, od);
Target_powerpc<size, big_endian>::Relocate::relocate(
const Relocate_info<size, big_endian>* relinfo,
Target_powerpc* target,
+ Output_section*,
size_t relnum,
const elfcpp::Rela<size, big_endian>& rela,
unsigned int r_type,
// Pick the value to use for symbols defined in shared objects.
Symbol_value<size> symval;
if (gsym != NULL
- && (gsym->is_from_dynobj()
- || (parameters->options().shared()
- && (gsym->is_undefined() || gsym->is_preemptible())))
- && gsym->has_plt_offset())
+ && gsym->use_plt_offset(r_type == elfcpp::R_POWERPC_REL24
+ || r_type == elfcpp::R_PPC_LOCAL24PC
+ || r_type == elfcpp::R_PPC_REL16
+ || r_type == elfcpp::R_PPC_REL16_LO
+ || r_type == elfcpp::R_PPC_REL16_HI
+ || r_type == elfcpp::R_PPC_REL16_HA))
{
elfcpp::Elf_Xword value;
break;
case elfcpp::R_PPC_REL16_HA:
- Reloc::rel16_lo(view, object, psymval, addend, address);
+ Reloc::rel16_ha(view, object, psymval, addend, address);
break;
case elfcpp::R_POWERPC_GOT16:
bool needs_special_offset_handling,
unsigned char* view,
typename elfcpp::Elf_types<size>::Elf_Addr address,
- section_size_type view_size)
+ section_size_type view_size,
+ const Reloc_symbol_changes* reloc_symbol_changes)
{
typedef Target_powerpc<size, big_endian> Powerpc;
typedef typename Target_powerpc<size, big_endian>::Relocate Powerpc_relocate;
needs_special_offset_handling,
view,
address,
- view_size);
+ view_size,
+ reloc_symbol_changes);
}
// Return the size of a relocation while scanning during a relocatable
template<int size, bool big_endian>
void
Target_powerpc<size, big_endian>::scan_relocatable_relocs(
- const General_options& options,
Symbol_table* symtab,
Layout* layout,
Sized_relobj<size, big_endian>* object,
gold::scan_relocatable_relocs<size, big_endian, elfcpp::SHT_RELA,
Scan_relocatable_relocs>(
- options,
symtab,
layout,
object,
(big_endian ? "elf32-powerpc" : "elf32-powerpcle")))
{ }
- Target* instantiated_target_;
-
- Target* do_recognize(int machine, int, int)
+ Target* do_recognize(int amachine, int, int)
{
switch (size)
{
case 64:
- if (machine != elfcpp::EM_PPC64)
+ if (amachine != elfcpp::EM_PPC64)
return NULL;
break;
case 32:
- if (machine != elfcpp::EM_PPC)
+ if (amachine != elfcpp::EM_PPC)
return NULL;
break;
return NULL;
}
- return do_instantiate_target();
+ return this->instantiate_target();
}
Target* do_instantiate_target()
- {
- if (this->instantiated_target_ == NULL)
- this->instantiated_target_ = new Target_powerpc<size, big_endian>();
- return this->instantiated_target_;
- }
+ { return new Target_powerpc<size, big_endian>(); }
};
Target_selector_powerpc<32, true> target_selector_ppc32;
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