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Add basic exception frame header, plus test.

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This commit is contained in:
Ian Lance Taylor
2007-09-26 05:44:38 +00:00
parent 4dffcebc10
commit 3151305a47
14 changed files with 739 additions and 102 deletions
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55
gold/layout.cc
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@ -31,6 +31,7 @@
#include "output.h"
#include "symtab.h"
#include "dynobj.h"
#include "ehframe.h"
#include "layout.h"
namespace gold
@ -65,7 +66,8 @@ Layout::Layout(const General_options& options)
section_name_map_(), segment_list_(), section_list_(),
unattached_section_list_(), special_output_list_(),
tls_segment_(NULL), symtab_section_(NULL),
dynsym_section_(NULL), dynamic_section_(NULL), dynamic_data_(NULL)
dynsym_section_(NULL), dynamic_section_(NULL), dynamic_data_(NULL),
eh_frame_section_(NULL)
{
// Make space for more than enough segments for a typical file.
// This is just for efficiency--it's OK if we wind up needing more.
@ -206,6 +208,17 @@ Layout::layout(Relobj* object, unsigned int shndx, const char* name,
shdr.get_sh_type(),
shdr.get_sh_flags());
// Special GNU handling of sections named .eh_frame.
if (!parameters->output_is_object()
&& strcmp(name, ".eh_frame") == 0
&& shdr.get_sh_size() > 0
&& shdr.get_sh_type() == elfcpp::SHT_PROGBITS
&& shdr.get_sh_flags() == elfcpp::SHF_ALLOC)
{
this->layout_eh_frame(object, shndx, name, shdr, os, off);
return os;
}
// FIXME: Handle SHF_LINK_ORDER somewhere.
*off = os->add_input_section(object, shndx, name, shdr);
@ -213,6 +226,46 @@ Layout::layout(Relobj* object, unsigned int shndx, const char* name,
return os;
}
// Special GNU handling of sections named .eh_frame. They will
// normally hold exception frame data.
template<int size, bool big_endian>
void
Layout::layout_eh_frame(Relobj* object,
unsigned int shndx,
const char* name,
const elfcpp::Shdr<size, big_endian>& shdr,
Output_section* os, off_t* off)
{
if (this->eh_frame_section_ == NULL)
{
this->eh_frame_section_ = os;
if (this->options_.create_eh_frame_hdr())
{
Stringpool::Key hdr_name_key;
const char* hdr_name = this->namepool_.add(".eh_frame_hdr",
&hdr_name_key);
Output_section* hdr_os =
this->get_output_section(hdr_name, hdr_name_key,
elfcpp::SHT_PROGBITS,
elfcpp::SHF_ALLOC);
Eh_frame_hdr* hdr_posd = new Eh_frame_hdr(object->target(), os);
hdr_os->add_output_section_data(hdr_posd);
Output_segment* hdr_oseg =
new Output_segment(elfcpp::PT_GNU_EH_FRAME, elfcpp::PF_R);
this->segment_list_.push_back(hdr_oseg);
hdr_oseg->add_output_section(hdr_os, elfcpp::PF_R);
}
}
gold_assert(this->eh_frame_section_ == os);
*off = os->add_input_section(object, shndx, name, shdr);
}
// Add POSD to an output section using NAME, TYPE, and FLAGS.
void