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gold: Maintain sparc ELF header bits properly 

gold/

	* sparc.cc (class Target_sparc): Add elf_machine_, elf_flags_,
	and elf_flags_set_.
	(Target_sparc::Target_sparc): Initialize new fields.
	(Target_sparc::do_make_elf_object): New function.
	(Target_sparc::do_adjust_elf_header): New function.
This commit is contained in:
David S. Miller 2012-04-23 23:42:03 +00:00
parent 1d50909894
commit a4d851453b
2 changed files with 120 additions and 1 deletions
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8
gold/ChangeLog
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@ -1,3 +1,11 @@
2012-04-23 David S. Miller <davem@davemloft.net>
* sparc.cc (class Target_sparc): Add elf_machine_, elf_flags_,
and elf_flags_set_.
(Target_sparc::Target_sparc): Initialize new fields.
(Target_sparc::do_make_elf_object): New function.
(Target_sparc::do_adjust_elf_header): New function.
2012-04-23 Cary Coutant <ccoutant@google.com>
* gdb-index.cc (Gdb_index::do_write): Use Swap_aligned32 for writing

113
gold/sparc.cc
View File

@ -60,7 +60,9 @@ class Target_sparc : public Sized_target<size, big_endian>
: Sized_target<size, big_endian>(&sparc_info),
got_(NULL), plt_(NULL), rela_dyn_(NULL), rela_ifunc_(NULL),
copy_relocs_(elfcpp::R_SPARC_COPY), dynbss_(NULL),
got_mod_index_offset_(-1U), tls_get_addr_sym_(NULL)
got_mod_index_offset_(-1U), tls_get_addr_sym_(NULL),
elf_machine_(sparc_info.machine_code), elf_flags_(0),
elf_flags_set_(false)
{
}
@ -206,6 +208,15 @@ class Target_sparc : public Sized_target<size, big_endian>
unsigned int
plt_entry_size() const;
protected:
// Make an ELF object.
Object*
do_make_elf_object(const std::string&, Input_file*, off_t,
const elfcpp::Ehdr<size, big_endian>& ehdr);
void
do_adjust_elf_header(unsigned char* view, int len) const;
private:
// The class which scans relocations.
@ -432,6 +443,12 @@ class Target_sparc : public Sized_target<size, big_endian>
unsigned int got_mod_index_offset_;
// Cached pointer to __tls_get_addr symbol
Symbol* tls_get_addr_sym_;
// Accumulated elf machine type
elfcpp::Elf_Half elf_machine_;
// Accumulated elf header flags
elfcpp::Elf_Word elf_flags_;
// Whether elf_flags_ has been set for the first time yet
bool elf_flags_set_;
};
template<>
@ -4071,6 +4088,100 @@ Target_sparc<size, big_endian>::do_dynsym_value(const Symbol* gsym) const
return this->plt_section()->address() + gsym->plt_offset();
}
// do_make_elf_object to override the same function in the base class.
// We need to use a target-specific sub-class of
// Sized_relobj_file<size, big_endian> to process SPARC specific bits
// of the ELF headers. Hence we need to have our own ELF object creation.
template<int size, bool big_endian>
Object*
Target_sparc<size, big_endian>::do_make_elf_object(
const std::string& name,
Input_file* input_file,
off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr)
{
elfcpp::Elf_Half machine = ehdr.get_e_machine();
elfcpp::Elf_Word flags = ehdr.get_e_flags();
elfcpp::Elf_Word omm, mm;
switch (machine)
{
case elfcpp::EM_SPARC32PLUS:
this->elf_machine_ = elfcpp::EM_SPARC32PLUS;
break;
case elfcpp::EM_SPARC:
case elfcpp::EM_SPARCV9:
break;
default:
break;
}
if (!this->elf_flags_set_)
{
this->elf_flags_ = flags;
this->elf_flags_set_ = true;
}
else
{
// Accumulate cpu feature bits.
this->elf_flags_ |= (flags & (elfcpp::EF_SPARC_32PLUS
| elfcpp::EF_SPARC_SUN_US1
| elfcpp::EF_SPARC_HAL_R1
| elfcpp::EF_SPARC_SUN_US3));
// Bump the memory model setting to the most restrictive
// one we encounter.
omm = (this->elf_flags_ & elfcpp::EF_SPARCV9_MM);
mm = (flags & elfcpp::EF_SPARCV9_MM);
if (omm != mm)
{
if (mm == elfcpp::EF_SPARCV9_TSO)
{
this->elf_flags_ &= ~elfcpp::EF_SPARCV9_MM;
this->elf_flags_ |= elfcpp::EF_SPARCV9_TSO;
}
else if (mm == elfcpp::EF_SPARCV9_PSO
&& omm == elfcpp::EF_SPARCV9_RMO)
{
this->elf_flags_ &= ~elfcpp::EF_SPARCV9_MM;
this->elf_flags_ |= elfcpp::EF_SPARCV9_PSO;
}
}
}
// Validate that the little-endian flag matches how we've
// been instantiated.
if (!(flags & elfcpp::EF_SPARC_LEDATA) != big_endian)
{
if (big_endian)
gold_error(_("%s: little endian elf flag set on BE object"),
name.c_str());
else
gold_error(_("%s: little endian elf flag clear on LE object"),
name.c_str());
}
return Target::do_make_elf_object(name, input_file, offset, ehdr);
}
// Adjust ELF file header.
template<int size, bool big_endian>
void
Target_sparc<size, big_endian>::do_adjust_elf_header(
unsigned char* view,
int len) const
{
elfcpp::Ehdr_write<size, big_endian> oehdr(view);
oehdr.put_e_machine(this->elf_machine_);
oehdr.put_e_flags(this->elf_flags_);
Sized_target<size, big_endian>::do_adjust_elf_header(view, len);
}
// The selector for sparc object files.
template<int size, bool big_endian>