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// Copyright (c) 2010, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// Original author: Jim Blandy <jimb@mozilla.com> <jimb@red-bean.com>
// cfi_assembler.cc: Implementation of google_breakpad::CFISection class.
// See cfi_assembler.h for details.
#include <cassert>
#include "common/dwarf/cfi_assembler.h"
#include "common/dwarf/dwarf2enums.h"
namespace google_breakpad {
CFISection &CFISection::CIEHeader(u_int64_t code_alignment_factor,
int data_alignment_factor,
unsigned return_address_register,
u_int8_t version,
const string &augmentation,
bool dwarf64) {
assert(!entry_length_);
entry_length_ = new PendingLength();
if (dwarf64) {
D32(0xffffffff);
D64(entry_length_->length);
entry_length_->start = Here();
D64(0xffffffffffffffffULL); // CIE distinguished value
} else {
D32(entry_length_->length);
entry_length_->start = Here();
D32(0xffffffff); // CIE distinguished value
}
D8(version);
AppendCString(augmentation);
ULEB128(code_alignment_factor);
LEB128(data_alignment_factor);
if (version == 1)
D8(return_address_register);
else
ULEB128(return_address_register);
return *this;
}
CFISection &CFISection::FDEHeader(Label cie_pointer,
u_int64_t initial_location,
u_int64_t address_range,
bool dwarf64) {
assert(!entry_length_);
entry_length_ = new PendingLength();
if (dwarf64) {
D32(0xffffffff);
D64(entry_length_->length);
entry_length_->start = Here();
D64(cie_pointer);
} else {
D32(entry_length_->length);
entry_length_->start = Here();
D32(cie_pointer);
}
Append(endianness(), address_size_, initial_location);
Append(endianness(), address_size_, address_range);
return *this;
}
CFISection &CFISection::FinishEntry() {
assert(entry_length_);
Align(address_size_, dwarf2reader::DW_CFA_nop);
entry_length_->length = Here() - entry_length_->start;
delete entry_length_;
entry_length_ = NULL;
return *this;
}
};
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