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Add support for MIPS .rld_map section. 

Includes DT_MIPS_RLD_MAP and DT_MIPS_RLD_MAP_REL dynamic tags and
__RLD_MAP symbol.

2016-06-20  Vladimir Radosavljevic  <Vladimir.Radosavljevic@imgtec.com>

elfcpp/
        * elfcpp.h (DT_MIPS_RLD_MAP_REL): New enum constant.
gold/
        * mips.cc (Target_mips::Target_mips): Initialize rld_map_.
        (Target_mips::rld_map_): New data member.
        (Target_mips::do_finalize_sections): Add support for
        DT_MIPS_RLD_MAP and DT_MIPS_RLD_MAP_REL dynamic tags,
        .rld_map section, and __RLD_MAP symbol.
        (Target_mips::do_dynamic_tag_custom_value): Add support for
        DT_MIPS_RLD_MAP_REL dynamic tag.
        * output.cc (Output_data_dynamic::get_entry_offset): New method
        definition.
        * output.h (Output_data_dynamic::get_entry_offset): New method
        declaration.
This commit is contained in:
Vladimir Radosavljevic 2016-06-20 12:10:53 -07:00 committed by Cary Coutant
parent beceef5043
commit a8ecc9fe61
6 changed files with 91 additions and 5 deletions
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4
elfcpp/ChangeLog
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@ -1,3 +1,7 @@
2016-06-20 Vladimir Radosavljevic <Vladimir.Radosavljevic@imgtec.com>
* elfcpp.h (DT_MIPS_RLD_MAP_REL): New enum constant.
2016-06-20 Vladimir Radosavljevic <Vladimir.Radosavljevic@imgtec.com>
* mips.h (R_MIPS_PC21_S2, R_MIPS_PC26_S2, R_MIPS_PC18_S3,

2
elfcpp/elfcpp.h
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@ -868,6 +868,8 @@ enum DT
DT_MIPS_PLTGOT = 0x70000032,
// Points to the base of a writable PLT.
DT_MIPS_RWPLT = 0x70000034,
// Relative offset of run time loader map, used for debugging.
DT_MIPS_RLD_MAP_REL = 0x70000035,
DT_AUXILIARY = 0x7ffffffd,
DT_USED = 0x7ffffffe,

14
gold/ChangeLog
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@ -1,3 +1,17 @@
2016-06-20 Vladimir Radosavljevic <Vladimir.Radosavljevic@imgtec.com>
* mips.cc (Target_mips::Target_mips): Initialize rld_map_.
(Target_mips::rld_map_): New data member.
(Target_mips::do_finalize_sections): Add support for
DT_MIPS_RLD_MAP and DT_MIPS_RLD_MAP_REL dynamic tags,
.rld_map section, and __RLD_MAP symbol.
(Target_mips::do_dynamic_tag_custom_value): Add support for
DT_MIPS_RLD_MAP_REL dynamic tag.
* output.cc (Output_data_dynamic::get_entry_offset): New method
definition.
* output.h (Output_data_dynamic::get_entry_offset): New method
declaration.
2016-06-20 Vladimir Radosavljevic <Vladimir.Radosavljevic@imgtec.com>
* mips.cc (Mips_relocate_functions::relpc16): Add unaligned check.

51
gold/mips.cc
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@ -3292,10 +3292,10 @@ class Target_mips : public Sized_target<size, big_endian>
public:
Target_mips(const Target::Target_info* info = &mips_info)
: Sized_target<size, big_endian>(info), got_(NULL), gp_(NULL), plt_(NULL),
got_plt_(NULL), rel_dyn_(NULL), copy_relocs_(), dyn_relocs_(),
la25_stub_(NULL), mips_mach_extensions_(), mips_stubs_(NULL),
attributes_section_data_(NULL), abiflags_(NULL), mach_(0), layout_(NULL),
got16_addends_(), has_abiflags_section_(false),
got_plt_(NULL), rel_dyn_(NULL), rld_map_(NULL), copy_relocs_(),
dyn_relocs_(), la25_stub_(NULL), mips_mach_extensions_(),
mips_stubs_(NULL), attributes_section_data_(NULL), abiflags_(NULL),
mach_(0), layout_(NULL), got16_addends_(), has_abiflags_section_(false),
entry_symbol_is_compressed_(false), insn32_(false)
{
this->add_machine_extensions();
@ -4181,6 +4181,8 @@ class Target_mips : public Sized_target<size, big_endian>
Output_data_space* got_plt_;
// The dynamic reloc section.
Reloc_section* rel_dyn_;
// The .rld_map section.
Output_data_zero_fill* rld_map_;
// Relocs saved to avoid a COPY reloc.
Mips_copy_relocs<elfcpp::SHT_REL, size, big_endian> copy_relocs_;
@ -9760,8 +9762,37 @@ Target_mips<size, big_endian>::do_finalize_sections(Layout* layout,
if (this->plt_ != NULL)
// DT_MIPS_PLTGOT dynamic tag
odyn->add_section_address(elfcpp::DT_MIPS_PLTGOT, this->got_plt_);
if (!parameters->options().shared())
{
this->rld_map_ = new Output_data_zero_fill(size / 8, size / 8);
layout->add_output_section_data(".rld_map", elfcpp::SHT_PROGBITS,
(elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE),
this->rld_map_, ORDER_INVALID, false);
// __RLD_MAP will be filled in by the runtime loader to contain
// a pointer to the _r_debug structure.
Symbol* rld_map = symtab->define_in_output_data("__RLD_MAP", NULL,
Symbol_table::PREDEFINED,
this->rld_map_,
0, 0, elfcpp::STT_OBJECT,
elfcpp::STB_GLOBAL,
elfcpp::STV_DEFAULT, 0,
false, false);
rld_map->set_needs_dynsym_entry();
if (!parameters->options().pie())
// This member holds the absolute address of the debug pointer.
odyn->add_section_address(elfcpp::DT_MIPS_RLD_MAP, this->rld_map_);
else
// This member holds the offset to the debug pointer,
// relative to the address of the tag.
odyn->add_custom(elfcpp::DT_MIPS_RLD_MAP_REL);
}
}
}
}
// Get the custom dynamic tag value.
template<int size, bool big_endian>
@ -9797,6 +9828,16 @@ Target_mips<size, big_endian>::do_dynamic_tag_custom_value(elfcpp::DT tag) const
return this->get_dt_mips_symtabno();
}
case elfcpp::DT_MIPS_RLD_MAP_REL:
{
// The MIPS_RLD_MAP_REL tag stores the offset to the debug pointer,
// relative to the address of the tag.
Output_data_dynamic* const odyn = this->layout_->dynamic_data();
unsigned int entry_offset =
odyn->get_entry_offset(elfcpp::DT_MIPS_RLD_MAP_REL);
gold_assert(entry_offset != -1U);
return this->rld_map_->address() - (odyn->address() + entry_offset);
}
default:
gold_error(_("Unknown dynamic tag 0x%x"), (unsigned int)tag);
}

21
gold/output.cc
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@ -1882,6 +1882,27 @@ Output_data_dynamic::do_adjust_output_section(Output_section* os)
gold_unreachable();
}
// Get a dynamic entry offset.
unsigned int
Output_data_dynamic::get_entry_offset(elfcpp::DT tag) const
{
int dyn_size;
if (parameters->target().get_size() == 32)
dyn_size = elfcpp::Elf_sizes<32>::dyn_size;
else if (parameters->target().get_size() == 64)
dyn_size = elfcpp::Elf_sizes<64>::dyn_size;
else
gold_unreachable();
for (size_t i = 0; i < entries_.size(); ++i)
if (entries_[i].tag() == tag)
return i * dyn_size;
return -1U;
}
// Set the final data size.
void

4
gold/output.h
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@ -2781,6 +2781,10 @@ class Output_data_dynamic : public Output_section_data
add_custom(elfcpp::DT tag)
{ this->add_entry(Dynamic_entry(tag)); }
// Get a dynamic entry offset.
unsigned int
get_entry_offset(elfcpp::DT tag) const;
protected:
// Adjust the output section to set the entry size.
void