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authorIan Lance Taylor <iant@google.com>2006-11-07 18:51:39 +0000
committerIan Lance Taylor <iant@google.com>2006-11-07 18:51:39 +0000
commit645f81233bd13bc6102580bac4b886c6056028e3 (patch)
treee104ddfc8f2a1f52326b8a2fa9c3b5c50ae43fa0 /gold/object.cc
parent9e59254c41b56b91b7640ed5b727430cc537daac (diff)
downloadgdb-645f81233bd13bc6102580bac4b886c6056028e3.zip
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Add Elf_file interface which can be used by both Sized_relobj and
Sized_dynobj.
Diffstat (limited to 'gold/object.cc')
-rw-r--r--gold/object.cc227
1 files changed, 79 insertions, 148 deletions
diff --git a/gold/object.cc b/gold/object.cc
index 956366c..677c731 100644
--- a/gold/object.cc
+++ b/gold/object.cc
@@ -5,6 +5,7 @@
#include <cerrno>
#include <cstring>
#include <cassert>
+#include <cstdarg>
#include "target-select.h"
#include "layout.h"
@@ -16,6 +17,34 @@
namespace gold
{
+// Class Object.
+
+// Report an error for the elfcpp::Elf_file interface.
+
+void
+Object::error(const char* format, ...)
+{
+ va_list args;
+
+ fprintf(stderr, "%s: %s: ", program_name, this->name().c_str());
+ va_start(args, format);
+ vfprintf(stderr, format, args);
+ va_end(args);
+ putc('\n', stderr);
+
+ gold_exit(false);
+}
+
+// Return a view of the contents of a section.
+
+const unsigned char*
+Object::section_contents(unsigned int shndx, off_t* plen)
+{
+ Location loc(this->do_section_contents(shndx));
+ *plen = loc.data_size;
+ return this->get_view(loc.file_offset, loc.data_size);
+}
+
// Class Sized_relobj.
template<int size, bool big_endian>
@@ -25,31 +54,15 @@ Sized_relobj<size, big_endian>::Sized_relobj(
off_t offset,
const elfcpp::Ehdr<size, big_endian>& ehdr)
: Relobj(name, input_file, offset),
+ elf_file_(this, ehdr),
section_headers_(NULL),
- flags_(ehdr.get_e_flags()),
- shoff_(ehdr.get_e_shoff()),
- shstrndx_(0),
- symtab_shnum_(0),
+ symtab_shndx_(0),
local_symbol_count_(0),
output_local_symbol_count_(0),
symbols_(NULL),
local_symbol_offset_(0),
values_(NULL)
{
- if (ehdr.get_e_ehsize() != This::ehdr_size)
- {
- fprintf(stderr, _("%s: %s: bad e_ehsize field (%d != %d)\n"),
- program_name, this->name().c_str(), ehdr.get_e_ehsize(),
- This::ehdr_size);
- gold_exit(false);
- }
- if (ehdr.get_e_shentsize() != This::shdr_size)
- {
- fprintf(stderr, _("%s: %s: bad e_shentsize field (%d != %d)\n"),
- program_name, this->name().c_str(), ehdr.get_e_shentsize(),
- This::shdr_size);
- gold_exit(false);
- }
}
template<int size, bool big_endian>
@@ -57,59 +70,7 @@ Sized_relobj<size, big_endian>::~Sized_relobj()
{
}
-// Read the section header for section SHNUM.
-
-template<int size, bool big_endian>
-inline const unsigned char*
-Sized_relobj<size, big_endian>::section_header(unsigned int shnum)
-{
- assert(shnum < this->shnum());
- off_t symtabshdroff = this->shoff_ + shnum * This::shdr_size;
- return this->get_view(symtabshdroff, This::shdr_size);
-}
-
-// Return the name of section SHNUM. The object must already be
-// locked.
-
-template<int size, bool big_endian>
-std::string
-Sized_relobj<size, big_endian>::do_section_name(unsigned int shnum)
-{
- // Read the section names.
- typename This::Shdr shdrnames(this->section_header(this->shstrndx_));
- const unsigned char* pnamesu = this->get_view(shdrnames.get_sh_offset(),
- shdrnames.get_sh_size());
- const char* pnames = reinterpret_cast<const char*>(pnamesu);
-
- typename This::Shdr shdr(this->section_header(shnum));
- if (shdr.get_sh_name() >= shdrnames.get_sh_size())
- {
- fprintf(stderr,
- _("%s: %s: bad section name offset for section %u: %lu\n"),
- program_name, this->name().c_str(), shnum,
- static_cast<unsigned long>(shdr.get_sh_name()));
- gold_exit(false);
- }
-
- return std::string(pnames + shdr.get_sh_name());
-}
-
-// Return a view of the contents of section SHNUM. The object does
-// not have to be locked.
-
-template<int size, bool big_endian>
-const unsigned char*
-Sized_relobj<size, big_endian>::do_section_contents(unsigned int shnum,
- off_t* plen)
-{
- Task_locker_obj<Object> tl(*this);
-
- typename This::Shdr shdr(this->section_header(shnum));
- *plen = shdr.get_sh_size();
- return this->get_view(shdr.get_sh_offset(), shdr.get_sh_size());
-}
-
-// Set up an object file bsaed on the file header. This sets up the
+// Set up an object file based on the file header. This sets up the
// target and reads the section information.
template<int size, bool big_endian>
@@ -129,25 +90,14 @@ Sized_relobj<size, big_endian>::setup(
}
this->set_target(target);
- unsigned int shnum = ehdr.get_e_shnum();
- unsigned int shstrndx = ehdr.get_e_shstrndx();
- if ((shnum == 0 || shstrndx == elfcpp::SHN_XINDEX)
- && this->shoff_ != 0)
- {
- typename This::Shdr shdr(this->section_header(0));
- if (shnum == 0)
- shnum = shdr.get_sh_size();
- if (shstrndx == elfcpp::SHN_XINDEX)
- shstrndx = shdr.get_sh_link();
- }
+ unsigned int shnum = this->elf_file_.shnum();
this->set_shnum(shnum);
- this->shstrndx_ = shstrndx;
-
if (shnum == 0)
return;
// We store the section headers in a File_view until do_read_symbols.
- this->section_headers_ = this->get_lasting_view(this->shoff_,
+ off_t shoff = this->elf_file_.shoff();
+ this->section_headers_ = this->get_lasting_view(shoff,
shnum * This::shdr_size);
// Find the SHT_SYMTAB section. The ELF standard says that maybe in
@@ -163,7 +113,7 @@ Sized_relobj<size, big_endian>::setup(
typename This::Shdr shdr(p);
if (shdr.get_sh_type() == elfcpp::SHT_SYMTAB)
{
- this->symtab_shnum_ = i;
+ this->symtab_shndx_ = i;
break;
}
}
@@ -181,13 +131,15 @@ Sized_relobj<size, big_endian>::do_read_symbols(Read_symbols_data* sd)
// Read the section names.
const unsigned char* pshdrs = sd->section_headers->data();
- const unsigned char* pshdrnames = pshdrs + this->shstrndx_ * This::shdr_size;
+ const unsigned char* pshdrnames = (pshdrs
+ + (this->elf_file_.shstrndx()
+ * This::shdr_size));
typename This::Shdr shdrnames(pshdrnames);
sd->section_names_size = shdrnames.get_sh_size();
sd->section_names = this->get_lasting_view(shdrnames.get_sh_offset(),
sd->section_names_size);
- if (this->symtab_shnum_ == 0)
+ if (this->symtab_shndx_ == 0)
{
// No symbol table. Weird but legal.
sd->symbols = NULL;
@@ -199,7 +151,7 @@ Sized_relobj<size, big_endian>::do_read_symbols(Read_symbols_data* sd)
// Get the symbol table section header.
typename This::Shdr symtabshdr(pshdrs
- + this->symtab_shnum_ * This::shdr_size);
+ + this->symtab_shndx_ * This::shdr_size);
assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
// We only need the external symbols.
@@ -276,14 +228,8 @@ Sized_relobj<size, big_endian>::include_section_group(
// Get the appropriate symbol table header (this will normally be
// the single SHT_SYMTAB section, but in principle it need not be).
- if (shdr.get_sh_link() >= this->shnum())
- {
- fprintf(stderr, _("%s: %s: section group %u link %u out of range\n"),
- program_name, this->name().c_str(), index, shdr.get_sh_link());
- gold_exit(false);
- }
-
- typename This::Shdr symshdr(this->section_header(shdr.get_sh_link()));
+ const unsigned int link = shdr.get_sh_link();
+ typename This::Shdr symshdr(this, this->elf_file_.section_header(link));
// Read the symbol table entry.
if (shdr.get_sh_info() >= symshdr.get_sh_size() / This::sym_size)
@@ -296,24 +242,14 @@ Sized_relobj<size, big_endian>::include_section_group(
const unsigned char* psym = this->get_view(symoff, This::sym_size);
elfcpp::Sym<size, big_endian> sym(psym);
- // Read the section header for the symbol table names.
- if (symshdr.get_sh_link() >= this->shnum())
- {
- fprintf(stderr, _("%s; %s: symtab section %u link %u out of range\n"),
- program_name, this->name().c_str(), shdr.get_sh_link(),
- symshdr.get_sh_link());
- gold_exit(false);
- }
-
- typename This::Shdr symnamehdr(this->section_header(symshdr.get_sh_link()));
-
// Read the symbol table names.
- const unsigned char *psymnamesu = this->get_view(symnamehdr.get_sh_offset(),
- symnamehdr.get_sh_size());
+ off_t symnamelen;
+ const unsigned char* psymnamesu;
+ psymnamesu = this->section_contents(symshdr.get_sh_link(), &symnamelen);
const char* psymnames = reinterpret_cast<const char*>(psymnamesu);
// Get the section group signature.
- if (sym.get_st_name() >= symnamehdr.get_sh_size())
+ if (sym.get_st_name() >= symnamelen)
{
fprintf(stderr, _("%s: %s: symbol %u name offset %u out of range\n"),
program_name, this->name().c_str(), shdr.get_sh_info(),
@@ -327,26 +263,11 @@ Sized_relobj<size, big_endian>::include_section_group(
// associated with a section symbol, and then fail to give a name to
// the section symbol. In such a case, use the name of the section.
// FIXME.
- if (signature[0] == '\0'
- && sym.get_st_type() == elfcpp::STT_SECTION
- && sym.get_st_shndx() < this->shnum())
+ std::string secname;
+ if (signature[0] == '\0' && sym.get_st_type() == elfcpp::STT_SECTION)
{
- typename This::Shdr shdrnames(this->section_header(this->shstrndx_));
- const unsigned char* pnamesu = this->get_view(shdrnames.get_sh_offset(),
- shdrnames.get_sh_size());
- const char* pnames = reinterpret_cast<const char*>(pnamesu);
-
- typename This::Shdr sechdr(this->section_header(sym.get_st_shndx()));
- if (sechdr.get_sh_name() >= shdrnames.get_sh_size())
- {
- fprintf(stderr,
- _("%s: %s: bad section name offset for section %u: %lu\n"),
- program_name, this->name().c_str(), sym.get_st_shndx(),
- static_cast<unsigned long>(sechdr.get_sh_name()));
- gold_exit(false);
- }
-
- signature = pnames + sechdr.get_sh_name();
+ secname = this->section_name(sym.get_st_shndx());
+ signature = secname.c_str();
}
// Record this section group, and see whether we've already seen one
@@ -543,7 +464,7 @@ off_t
Sized_relobj<size, big_endian>::do_finalize_local_symbols(off_t off,
Stringpool* pool)
{
- if (this->symtab_shnum_ == 0)
+ if (this->symtab_shndx_ == 0)
{
// This object has no symbols. Weird but legal.
return off;
@@ -554,7 +475,9 @@ Sized_relobj<size, big_endian>::do_finalize_local_symbols(off_t off,
this->local_symbol_offset_ = off;
// Read the symbol table section header.
- typename This::Shdr symtabshdr(this->section_header(this->symtab_shnum_));
+ const unsigned int symtab_shndx = this->symtab_shndx_;
+ typename This::Shdr symtabshdr(this,
+ this->elf_file_.section_header(symtab_shndx));
assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
// Read the local symbols.
@@ -567,14 +490,11 @@ Sized_relobj<size, big_endian>::do_finalize_local_symbols(off_t off,
this->values_ = new typename elfcpp::Elf_types<size>::Elf_Addr[loccount];
- // Read the section header for the symbol names.
- typename This::Shdr strtabshdr(
- this->section_header(symtabshdr.get_sh_link()));
- assert(strtabshdr.get_sh_type() == elfcpp::SHT_STRTAB);
-
// Read the symbol names.
- const unsigned char* pnamesu = this->get_view(strtabshdr.get_sh_offset(),
- strtabshdr.get_sh_size());
+ const unsigned int strtab_shndx = symtabshdr.get_sh_link();
+ off_t strtab_size;
+ const unsigned char* pnamesu = this->section_contents(strtab_shndx,
+ &strtab_size);
const char* pnames = reinterpret_cast<const char*>(pnamesu);
// Loop over the local symbols.
@@ -628,6 +548,17 @@ Sized_relobj<size, big_endian>::do_finalize_local_symbols(off_t off,
if (sym.get_st_type() != elfcpp::STT_SECTION)
{
+ if (sym.get_st_name() >= strtab_size)
+ {
+ fprintf(stderr,
+ _("%s: %s: local symbol %u section name "
+ "out of range: %u >= %u\n"),
+ program_name, this->name().c_str(),
+ i, sym.get_st_name(),
+ static_cast<unsigned int>(strtab_size));
+ gold_exit(false);
+ }
+
pool->add(pnames + sym.get_st_name(), NULL);
off += sym_size;
++count;
@@ -646,14 +577,16 @@ void
Sized_relobj<size, big_endian>::write_local_symbols(Output_file* of,
const Stringpool* sympool)
{
- if (this->symtab_shnum_ == 0)
+ if (this->symtab_shndx_ == 0)
{
// This object has no symbols. Weird but legal.
return;
}
// Read the symbol table section header.
- typename This::Shdr symtabshdr(this->section_header(this->symtab_shnum_));
+ const unsigned int symtab_shndx = this->symtab_shndx_;
+ typename This::Shdr symtabshdr(this,
+ this->elf_file_.section_header(symtab_shndx));
assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
const unsigned int loccount = this->local_symbol_count_;
assert(loccount == symtabshdr.get_sh_info());
@@ -664,14 +597,11 @@ Sized_relobj<size, big_endian>::write_local_symbols(Output_file* of,
const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(),
locsize);
- // Read the section header for the symbol names.
- typename This::Shdr strtabshdr(
- this->section_header(symtabshdr.get_sh_link()));
- assert(strtabshdr.get_sh_type() == elfcpp::SHT_STRTAB);
-
// Read the symbol names.
- const unsigned char* pnamesu = this->get_view(strtabshdr.get_sh_offset(),
- strtabshdr.get_sh_size());
+ const unsigned int strtab_shndx = symtabshdr.get_sh_link();
+ off_t strtab_size;
+ const unsigned char* pnamesu = this->section_contents(strtab_shndx,
+ &strtab_size);
const char* pnames = reinterpret_cast<const char*>(pnamesu);
// Get a view into the output file.
@@ -701,6 +631,7 @@ Sized_relobj<size, big_endian>::write_local_symbols(Output_file* of,
elfcpp::Sym_write<size, big_endian> osym(ov);
+ assert(isym.get_st_name() < strtab_size);
osym.put_st_name(sympool->get_offset(pnames + isym.get_st_name()));
osym.put_st_value(this->values_[i]);
osym.put_st_size(isym.get_st_size());