// ehframe.h -- handle exception frame sections for gold -*- C++ -*-
-// Copyright 2006, 2007, 2008, 2010, 2011 Free Software Foundation, Inc.
+// Copyright (C) 2006-2019 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
}
// Create an FDE associated with a PLT.
- Fde(Output_data* plt, const unsigned char* contents, size_t length)
+ Fde(Output_data* plt, const unsigned char* contents, size_t length,
+ bool post_map)
: object_(NULL),
contents_(reinterpret_cast<const char*>(contents), length)
- { this->u_.from_linker.plt = plt; }
+ {
+ this->u_.from_linker.plt = plt;
+ this->u_.from_linker.post_map = post_map;
+ }
// Return the length of this FDE. Add 4 for the length and 4 for
// the offset to the CIE.
// Add a mapping for this FDE to MERGE_MAP, so that relocations
// against the FDE are applied to right part of the output file.
void
- add_mapping(section_offset_type output_offset, Merge_map* merge_map) const
+ add_mapping(section_offset_type output_offset,
+ Output_section_data* output_data) const
{
if (this->object_ != NULL)
- merge_map->add_mapping(this->object_, this->u_.from_object.shndx,
+ this->object_->add_merge_mapping(output_data, this->u_.from_object.shndx,
this->u_.from_object.input_offset, this->length(),
output_offset);
}
+ // Return whether this FDE was added after merge mapping.
+ bool
+ post_map() const
+ { return this->object_ == NULL && this->u_.from_linker.post_map; }
+
+ // Return whether this FDE was added for the PLT after merge mapping.
+ bool
+ post_map(const Output_data* plt) const
+ { return this->post_map() && this->u_.from_linker.plt == plt; }
+
// Write the FDE to OVIEW starting at OFFSET. FDE_ENCODING is the
// encoding, from the CIE. Round up the bytes to ADDRALIGN if
// necessary. ADDRESS is the virtual address of OVIEW. Record the
// FDE in EH_FRAME_HDR. Return the new offset.
template<int size, bool big_endian>
section_offset_type
- write(unsigned char* oview, section_offset_type offset,
- uint64_t address, unsigned int addralign,
+ write(unsigned char* oview, section_offset_type output_section_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);
// The only linker generated FDEs are for PLT sections, and this
// points to the PLT section.
Output_data* plt;
+ // Set if the FDE was added after merge mapping.
+ bool post_map;
} from_linker;
} u_;
// FDE data.
std::string contents_;
};
+// A FDE plus some info from a CIE to allow later writing of the FDE.
+
+struct Post_fde
+{
+ Post_fde(Fde* f, section_offset_type cie_off, unsigned char encoding)
+ : fde(f), cie_offset(cie_off), fde_encoding(encoding)
+ { }
+
+ Fde* fde;
+ section_offset_type cie_offset;
+ unsigned char fde_encoding;
+};
+
+typedef std::vector<Post_fde> Post_fdes;
+
// This class holds a CIE.
class Cie
add_fde(Fde* fde)
{ this->fdes_.push_back(fde); }
+ // Remove the last FDE associated with this CIE.
+ void
+ remove_fde()
+ { this->fdes_.pop_back(); }
+
+ // Access the last FDE associated with this CIE.
+ const Fde*
+ last_fde() const
+ { return this->fdes_.back(); }
+
// Return the number of FDEs.
unsigned int
fde_count() const
// mapping. It returns the new output offset.
section_offset_type
set_output_offset(section_offset_type output_offset, unsigned int addralign,
- Merge_map*);
+ Output_section_data*);
- // Write the CIE to OVIEW starting at OFFSET. EH_FRAME_HDR is the
- // exception frame header for FDE recording. Round up the bytes to
- // ADDRALIGN. ADDRESS is the virtual address of OVIEW. Return the
- // new offset.
+ // Write the CIE to OVIEW starting at OFFSET. 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
- write(unsigned char* oview, section_offset_type offset, uint64_t address,
- unsigned int addralign, Eh_frame_hdr* eh_frame_hdr);
+ write(unsigned char* oview, section_offset_type output_section_offset,
+ section_offset_type offset, uint64_t address,
+ unsigned int addralign, Eh_frame_hdr* eh_frame_hdr,
+ Post_fdes* post_fdes);
+
+ // Return the FDE encoding.
+ unsigned char
+ fde_encoding() const
+ { return this->fde_encoding_; }
friend bool operator<(const Cie&, const Cie&);
friend bool operator==(const Cie&, const Cie&);
class Eh_frame : public Output_section_data
{
public:
+ enum Eh_frame_section_disposition
+ {
+ EH_EMPTY_SECTION,
+ EH_UNRECOGNIZED_SECTION,
+ EH_OPTIMIZABLE_SECTION,
+ EH_END_MARKER_SECTION
+ };
+
Eh_frame();
// Record the associated Eh_frame_hdr, if any.
// returns whether the section was incorporated into the .eh_frame
// data.
template<int size, bool big_endian>
- bool
+ Eh_frame_section_disposition
add_ehframe_input_section(Sized_relobj_file<size, big_endian>* object,
const unsigned char* symbols,
section_size_type symbols_size,
size_t cie_length, const unsigned char* fde_data,
size_t fde_length);
+ // Remove all post-map unwind information for a PLT.
+ void
+ remove_ehframe_for_plt(Output_data* plt, const unsigned char* cie_data,
+ size_t cie_length);
+
// Return the number of FDEs.
unsigned int
fde_count() const;
section_offset_type offset,
section_offset_type* poutput) const;
- // Return whether this is the merge section for an input section.
- bool
- do_is_merge_section_for(const Relobj*, unsigned int shndx) const;
-
// Write the data to the file.
void
do_write(Output_file*);
// A mapping from unmergeable CIEs to their offset in the output
// file.
Unmergeable_cie_offsets unmergeable_cie_offsets_;
- // A mapping from input sections to the output section.
- Merge_map merge_map_;
// Whether we have created the mappings to the output section.
bool mappings_are_done_;
// The final data size. This is only set if mappings_are_done_ is
projects / deliverable / binutils-gdb.git / blobdiff