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* elfcpp_file.h (class Elf_file): Add large_shndx_offset_ field.

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(Elf_file::large_shndx_offset): New function.
	(Elf_file::construct): Initialize large_shndx_offset_.
	(Elf_File::initialize_shnum): If necessary, adjust shstrndx_ and
	set large_shndx_offset_.
This commit is contained in:
Ian Lance Taylor 2008-04-19 18:33:19 +00:00
parent d491d34e93
commit fa29711731
2 changed files with 48 additions and 1 deletions
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8
elfcpp/ChangeLog
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@ -1,3 +1,11 @@
2008-04-19 Ian Lance Taylor <iant@google.com>
* elfcpp_file.h (class Elf_file): Add large_shndx_offset_ field.
(Elf_file::large_shndx_offset): New function.
(Elf_file::construct): Initialize large_shndx_offset_.
(Elf_File::initialize_shnum): If necessary, adjust shstrndx_ and
set large_shndx_offset_.
2008-04-16 David S. Miller <davem@davemloft.net>
* elfcpp.h (DF_1_NOW, DF_1_GLOBAL, DF_1_GROUP,

39
elfcpp/elfcpp_file.h
View File

@ -115,6 +115,15 @@ class Elf_file
return this->shstrndx_;
}
// Return the value to subtract from section indexes >=
// SHN_LORESERVE. See the comment in initialize_shnum.
int
large_shndx_offset()
{
this->initialize_shnum();
return this->large_shndx_offset_;
}
// Return the location of the header of section SHNDX.
typename File::Location
section_header(unsigned int shndx)
@ -180,6 +189,8 @@ class Elf_file
unsigned int shnum_;
// The section index of the section name string table.
unsigned int shstrndx_;
// Offset to add to sections larger than SHN_LORESERVE.
int large_shndx_offset_;
};
// Template function definitions.
@ -194,6 +205,7 @@ Elf_file<size, big_endian, File>::construct(File* file, const Ef_ehdr& ehdr)
this->shoff_ = ehdr.get_e_shoff();
this->shnum_ = ehdr.get_e_shnum();
this->shstrndx_ = ehdr.get_e_shstrndx();
this->large_shndx_offset_ = 0;
if (ehdr.get_e_ehsize() != This::ehdr_size)
file->error(_("bad e_ehsize (%d != %d)"),
ehdr.get_e_ehsize(), This::ehdr_size);
@ -223,10 +235,37 @@ Elf_file<size, big_endian, File>::initialize_shnum()
{
typename File::View v(this->file_->view(this->shoff_, This::shdr_size));
Ef_shdr shdr(v.data());
if (this->shnum_ == 0)
this->shnum_ = shdr.get_sh_size();
if (this->shstrndx_ == SHN_XINDEX)
{
this->shstrndx_ = shdr.get_sh_link();
// Versions of the GNU binutils between 2.12 and 2.18 did
// not handle objects with more than SHN_LORESERVE sections
// correctly. All large section indexes were offset by
// 0x100. Some information can be found here:
// http://sourceware.org/bugzilla/show_bug.cgi?id=5900 .
// Fortunately these object files are easy to detect, as the
// GNU binutils always put the section header string table
// near the end of the list of sections. Thus if the
// section header string table index is larger than the
// number of sections, then we know we have to subtract
// 0x100 to get the real section index.
if (this->shstrndx_ >= this->shnum_)
{
if (this->shstrndx_ >= elfcpp::SHN_LORESERVE + 0x100)
{
this->large_shndx_offset_ = - 0x100;
this->shstrndx_ -= 0x100;
}
if (this->shstrndx_ >= this->shnum_)
this->file_->error(_("bad shstrndx: %u >= %u"),
this->shstrndx_, this->shnum_);
}
}
}
}