// ehframe.cc -- handle exception frame sections for gold
-// Copyright 2006, 2007, 2008, 2010 Free Software Foundation, Inc.
+// Copyright (C) 2006-2016 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
gold_unreachable();
}
- switch (fde_encoding & 0xf0)
+ switch (fde_encoding & 0x70)
{
case 0:
break;
pc += eh_frame_address + fde_offset + 8;
break;
+ case elfcpp::DW_EH_PE_datarel:
+ pc += parameters->target().ehframe_datarel_base();
+ break;
+
default:
// If other cases arise, then we have to handle them, or we have
// to reject them by returning false in Eh_frame::read_cie.
gold_unreachable();
}
+ gold_assert((fde_encoding & elfcpp::DW_EH_PE_indirect) == 0);
+
return pc;
}
// Class Fde.
// Write the FDE to OVIEW starting at OFFSET. CIE_OFFSET is the
-// offset of the CIE in OVIEW. FDE_ENCODING is the encoding, from the
-// CIE. ADDRALIGN is the required alignment. Record the FDE pc for
+// offset of the CIE in OVIEW. OUTPUT_OFFSET is the offset of the
+// Eh_frame section within the output section. FDE_ENCODING is the
+// encoding, from the CIE. ADDRALIGN is the required alignment.
+// ADDRESS is the virtual address of OVIEW. Record the FDE pc for
// EH_FRAME_HDR. Return the new offset.
template<int size, bool big_endian>
section_offset_type
-Fde::write(unsigned char* oview, section_offset_type offset,
- unsigned int addralign, section_offset_type cie_offset,
- unsigned char fde_encoding, Eh_frame_hdr* eh_frame_hdr)
+Fde::write(unsigned char* oview, section_offset_type output_offset,
+ section_offset_type offset, uint64_t address, unsigned int addralign,
+ section_offset_type cie_offset, unsigned char fde_encoding,
+ Eh_frame_hdr* eh_frame_hdr)
{
gold_assert((offset & (addralign - 1)) == 0);
// will later be applied to the FDE data.
memcpy(oview + offset + 8, this->contents_.data(), length);
+ // If this FDE is associated with a PLT, fill in the PLT's address
+ // and size.
+ if (this->object_ == NULL)
+ {
+ gold_assert(memcmp(oview + offset + 8, "\0\0\0\0\0\0\0\0", 8) == 0);
+ uint64_t paddress;
+ off_t psize;
+ parameters->target().plt_fde_location(this->u_.from_linker.plt,
+ oview + offset + 8,
+ &paddress, &psize);
+ uint64_t poffset = paddress - (address + offset + 8);
+ int32_t spoffset = static_cast<int32_t>(poffset);
+ uint32_t upsize = static_cast<uint32_t>(psize);
+ if (static_cast<uint64_t>(static_cast<int64_t>(spoffset)) != poffset
+ || static_cast<off_t>(upsize) != psize)
+ gold_warning(_("overflow in PLT unwind data; "
+ "unwinding through PLT may fail"));
+ elfcpp::Swap<32, big_endian>::writeval(oview + offset + 8, spoffset);
+ elfcpp::Swap<32, big_endian>::writeval(oview + offset + 12, upsize);
+ }
+
if (aligned_full_length > length + 8)
memset(oview + offset + length + 8, 0, aligned_full_length - (length + 8));
// Tell the exception frame header about this FDE.
if (eh_frame_hdr != NULL)
- eh_frame_hdr->record_fde(offset, fde_encoding);
+ eh_frame_hdr->record_fde(output_offset + offset, fde_encoding);
return offset + aligned_full_length;
}
section_offset_type
Cie::set_output_offset(section_offset_type output_offset,
unsigned int addralign,
- Merge_map* merge_map)
+ Output_section_data *output_data)
{
size_t length = this->contents_.length();
// Add 4 for length and 4 for zero CIE identifier tag.
length += 8;
- merge_map->add_mapping(this->object_, this->shndx_, this->input_offset_,
- length, output_offset);
+ if (this->object_ != NULL)
+ {
+ // Add a mapping so that relocations are applied correctly.
+ this->object_->add_merge_mapping(output_data, this->shndx_,
+ this->input_offset_, length,
+ output_offset);
+ }
length = align_address(length, addralign);
p != this->fdes_.end();
++p)
{
- (*p)->add_mapping(output_offset + length, merge_map);
+ (*p)->add_mapping(output_offset + length, output_data);
size_t fde_length = (*p)->length();
fde_length = align_address(fde_length, addralign);
return output_offset + length;
}
-// Write the CIE to OVIEW starting at OFFSET. EH_FRAME_HDR is for FDE
-// recording. Round up the bytes to ADDRALIGN. Return the new
-// offset.
+// Write the CIE to OVIEW starting at OFFSET. OUTPUT_OFFSET is the
+// offset of the Eh_frame section within the output section. Round up
+// the bytes to ADDRALIGN. ADDRESS is the virtual address of OVIEW.
+// EH_FRAME_HDR is the exception frame header for FDE recording.
+// POST_FDES stashes FDEs created after mappings were done, for later
+// writing. Return the new offset.
template<int size, bool big_endian>
section_offset_type
-Cie::write(unsigned char* oview, section_offset_type offset,
- unsigned int addralign, Eh_frame_hdr* eh_frame_hdr)
+Cie::write(unsigned char* oview, section_offset_type output_offset,
+ section_offset_type offset, uint64_t address,
+ unsigned int addralign, Eh_frame_hdr* eh_frame_hdr,
+ Post_fdes* post_fdes)
{
gold_assert((offset & (addralign - 1)) == 0);
for (std::vector<Fde*>::const_iterator p = this->fdes_.begin();
p != this->fdes_.end();
++p)
- offset = (*p)->write<size, big_endian>(oview, offset, addralign,
- cie_offset, fde_encoding,
- eh_frame_hdr);
+ {
+ if ((*p)->post_map())
+ post_fdes->push_back(Post_fde(*p, cie_offset, fde_encoding));
+ else
+ offset = (*p)->write<size, big_endian>(oview, output_offset, offset,
+ address, addralign, cie_offset,
+ fde_encoding, eh_frame_hdr);
+ }
return offset;
}
eh_frame_hdr_(NULL),
cie_offsets_(),
unmergeable_cie_offsets_(),
- merge_map_(),
mappings_are_done_(false),
final_data_size_(0)
{
// section.
template<int size, bool big_endian>
-bool
+Eh_frame::Eh_frame_section_disposition
Eh_frame::add_ehframe_input_section(
Sized_relobj_file<size, big_endian>* object,
const unsigned char* symbols,
&contents_len,
false);
if (contents_len == 0)
- return false;
+ return EH_EMPTY_SECTION;
// If this is the marker section for the end of the data, then
// return false to force it to be handled as an ordinary input
// of unrecognized .eh_frame sections.
if (contents_len == 4
&& elfcpp::Swap<32, big_endian>::readval(pcontents) == 0)
- return false;
+ return EH_END_MARKER_SECTION;
New_cies new_cies;
if (!this->do_add_ehframe_input_section(object, symbols, symbols_size,
++p)
delete p->first;
- return false;
+ return EH_UNRECOGNIZED_SECTION;
}
// Now that we know we are using this section, record any new CIEs
this->unmergeable_cie_offsets_.push_back(p->first);
}
- return true;
+ return EH_OPTIMIZABLE_SECTION;
}
// The bulk of the implementation of add_ehframe_input_section.
section_size_type contents_len,
New_cies* new_cies)
{
- typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
Track_relocs<size, big_endian> relocs;
const unsigned char* p = pcontents;
// know for sure that we are doing a special mapping for this
// input section, but that's OK--if we don't do a special
// mapping, nobody will ever ask for the mapping we add here.
- this->merge_map_.add_mapping(object, shndx, (pcie - 8) - pcontents,
- pcieend - (pcie - 8), -1);
+ object->add_merge_mapping(this, shndx, (pcie - 8) - pcontents,
+ pcieend - (pcie - 8), -1);
}
// Record this CIE plus the offset in the input section.
{
// This FDE applies to a section which we are discarding. We
// can discard this FDE.
- this->merge_map_.add_mapping(object, shndx, (pfde - 8) - pcontents,
- pfdeend - (pfde - 8), -1);
+ object->add_merge_mapping(this, shndx, (pfde - 8) - pcontents,
+ pfdeend - (pfde - 8), -1);
return true;
}
return true;
}
+// Add unwind information for a PLT.
+
+void
+Eh_frame::add_ehframe_for_plt(Output_data* plt, const unsigned char* cie_data,
+ size_t cie_length, const unsigned char* fde_data,
+ size_t fde_length)
+{
+ Cie cie(NULL, 0, 0, elfcpp::DW_EH_PE_pcrel | elfcpp::DW_EH_PE_sdata4, "",
+ cie_data, cie_length);
+ Cie_offsets::iterator find_cie = this->cie_offsets_.find(&cie);
+ Cie* pcie;
+ if (find_cie != this->cie_offsets_.end())
+ pcie = *find_cie;
+ else
+ {
+ gold_assert(!this->mappings_are_done_);
+ pcie = new Cie(cie);
+ this->cie_offsets_.insert(pcie);
+ }
+
+ Fde* fde = new Fde(plt, fde_data, fde_length, this->mappings_are_done_);
+ pcie->add_fde(fde);
+
+ if (this->mappings_are_done_)
+ this->final_data_size_ += align_address(fde_length + 8, this->addralign());
+}
+
// Return the number of FDEs.
unsigned int
return;
}
- section_offset_type output_offset = 0;
+ section_offset_type output_start = 0;
+ if (this->is_offset_valid())
+ output_start = this->offset() - this->output_section()->offset();
+ section_offset_type output_offset = output_start;
for (Unmergeable_cie_offsets::iterator p =
this->unmergeable_cie_offsets_.begin();
++p)
output_offset = (*p)->set_output_offset(output_offset,
this->addralign(),
- &this->merge_map_);
+ this);
for (Cie_offsets::iterator p = this->cie_offsets_.begin();
p != this->cie_offsets_.end();
++p)
output_offset = (*p)->set_output_offset(output_offset,
this->addralign(),
- &this->merge_map_);
+ this);
this->mappings_are_done_ = true;
- this->final_data_size_ = output_offset;
+ this->final_data_size_ = output_offset - output_start;
gold_assert((output_offset & (this->addralign() - 1)) == 0);
- this->set_data_size(output_offset);
+ this->set_data_size(this->final_data_size_);
}
// Return an output offset for an input offset.
section_offset_type offset,
section_offset_type* poutput) const
{
- return this->merge_map_.get_output_offset(object, shndx, offset, poutput);
-}
-
-// Return whether this is the merge section for an input section.
-
-bool
-Eh_frame::do_is_merge_section_for(const Relobj* object,
- unsigned int shndx) const
-{
- return this->merge_map_.is_merge_section_for(object, shndx);
+ return object->merge_output_offset(shndx, offset, poutput);
}
// Write the data to the output file.
void
Eh_frame::do_sized_write(unsigned char* oview)
{
+ uint64_t address = this->address();
unsigned int addralign = this->addralign();
section_offset_type o = 0;
+ const off_t output_offset = this->offset() - this->output_section()->offset();
+ Post_fdes post_fdes;
for (Unmergeable_cie_offsets::iterator p =
this->unmergeable_cie_offsets_.begin();
p != this->unmergeable_cie_offsets_.end();
++p)
- o = (*p)->write<size, big_endian>(oview, o, addralign,
- this->eh_frame_hdr_);
+ o = (*p)->write<size, big_endian>(oview, output_offset, o, address,
+ addralign, this->eh_frame_hdr_,
+ &post_fdes);
for (Cie_offsets::iterator p = this->cie_offsets_.begin();
p != this->cie_offsets_.end();
++p)
- o = (*p)->write<size, big_endian>(oview, o, addralign,
- this->eh_frame_hdr_);
+ o = (*p)->write<size, big_endian>(oview, output_offset, o, address,
+ addralign, this->eh_frame_hdr_,
+ &post_fdes);
+ for (Post_fdes::iterator p = post_fdes.begin();
+ p != post_fdes.end();
+ ++p)
+ o = (*p).fde->write<size, big_endian>(oview, output_offset, o, address,
+ addralign, (*p).cie_offset,
+ (*p).fde_encoding,
+ this->eh_frame_hdr_);
}
#ifdef HAVE_TARGET_32_LITTLE
template
-bool
+Eh_frame::Eh_frame_section_disposition
Eh_frame::add_ehframe_input_section<32, false>(
Sized_relobj_file<32, false>* object,
const unsigned char* symbols,
#ifdef HAVE_TARGET_32_BIG
template
-bool
+Eh_frame::Eh_frame_section_disposition
Eh_frame::add_ehframe_input_section<32, true>(
Sized_relobj_file<32, true>* object,
const unsigned char* symbols,
#ifdef HAVE_TARGET_64_LITTLE
template
-bool
+Eh_frame::Eh_frame_section_disposition
Eh_frame::add_ehframe_input_section<64, false>(
Sized_relobj_file<64, false>* object,
const unsigned char* symbols,
#ifdef HAVE_TARGET_64_BIG
template
-bool
+Eh_frame::Eh_frame_section_disposition
Eh_frame::add_ehframe_input_section<64, true>(
Sized_relobj_file<64, true>* object,
const unsigned char* symbols,
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