199 lines
6.8 KiB
C++
199 lines
6.8 KiB
C++
// Copyright (c) 2010, Google Inc.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Original author: Jim Blandy <jimb@mozilla.com> <jimb@red-bean.com>
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// cfi_assembler.cc: Implementation of google_breakpad::CFISection class.
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// See cfi_assembler.h for details.
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#include "common/dwarf/cfi_assembler.h"
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#include <assert.h>
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#include <stdlib.h>
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namespace google_breakpad {
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using dwarf2reader::DwarfPointerEncoding;
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CFISection &CFISection::CIEHeader(u_int64_t code_alignment_factor,
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int data_alignment_factor,
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unsigned return_address_register,
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u_int8_t version,
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const string &augmentation,
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bool dwarf64) {
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assert(!entry_length_);
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entry_length_ = new PendingLength();
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in_fde_ = false;
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if (dwarf64) {
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D32(kDwarf64InitialLengthMarker);
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D64(entry_length_->length);
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entry_length_->start = Here();
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D64(eh_frame_ ? kEHFrame64CIEIdentifier : kDwarf64CIEIdentifier);
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} else {
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D32(entry_length_->length);
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entry_length_->start = Here();
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D32(eh_frame_ ? kEHFrame32CIEIdentifier : kDwarf32CIEIdentifier);
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}
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D8(version);
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AppendCString(augmentation);
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ULEB128(code_alignment_factor);
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LEB128(data_alignment_factor);
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if (version == 1)
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D8(return_address_register);
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else
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ULEB128(return_address_register);
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return *this;
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}
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CFISection &CFISection::FDEHeader(Label cie_pointer,
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u_int64_t initial_location,
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u_int64_t address_range,
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bool dwarf64) {
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assert(!entry_length_);
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entry_length_ = new PendingLength();
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in_fde_ = true;
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fde_start_address_ = initial_location;
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if (dwarf64) {
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D32(0xffffffff);
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D64(entry_length_->length);
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entry_length_->start = Here();
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if (eh_frame_)
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D64(Here() - cie_pointer);
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else
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D64(cie_pointer);
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} else {
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D32(entry_length_->length);
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entry_length_->start = Here();
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if (eh_frame_)
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D32(Here() - cie_pointer);
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else
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D32(cie_pointer);
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}
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EncodedPointer(initial_location);
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// The FDE length in an .eh_frame section uses the same encoding as the
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// initial location, but ignores the base address (selected by the upper
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// nybble of the encoding), as it's a length, not an address that can be
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// made relative.
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EncodedPointer(address_range,
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DwarfPointerEncoding(pointer_encoding_ & 0x0f));
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return *this;
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}
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CFISection &CFISection::FinishEntry() {
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assert(entry_length_);
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Align(address_size_, dwarf2reader::DW_CFA_nop);
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entry_length_->length = Here() - entry_length_->start;
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delete entry_length_;
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entry_length_ = NULL;
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in_fde_ = false;
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return *this;
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}
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CFISection &CFISection::EncodedPointer(u_int64_t address,
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DwarfPointerEncoding encoding,
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const EncodedPointerBases &bases) {
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// Omitted data is extremely easy to emit.
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if (encoding == dwarf2reader::DW_EH_PE_omit)
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return *this;
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// If (encoding & dwarf2reader::DW_EH_PE_indirect) != 0, then we assume
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// that ADDRESS is the address at which the pointer is stored --- in
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// other words, that bit has no effect on how we write the pointer.
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encoding = DwarfPointerEncoding(encoding & ~dwarf2reader::DW_EH_PE_indirect);
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// Find the base address to which this pointer is relative. The upper
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// nybble of the encoding specifies this.
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u_int64_t base;
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switch (encoding & 0xf0) {
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case dwarf2reader::DW_EH_PE_absptr: base = 0; break;
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case dwarf2reader::DW_EH_PE_pcrel: base = bases.cfi + Size(); break;
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case dwarf2reader::DW_EH_PE_textrel: base = bases.text; break;
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case dwarf2reader::DW_EH_PE_datarel: base = bases.data; break;
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case dwarf2reader::DW_EH_PE_funcrel: base = fde_start_address_; break;
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case dwarf2reader::DW_EH_PE_aligned: base = 0; break;
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default: abort();
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};
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// Make ADDRESS relative. Yes, this is appropriate even for "absptr"
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// values; see gcc/unwind-pe.h.
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address -= base;
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// Align the pointer, if required.
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if ((encoding & 0xf0) == dwarf2reader::DW_EH_PE_aligned)
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Align(AddressSize());
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// Append ADDRESS to this section in the appropriate form. For the
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// fixed-width forms, we don't need to differentiate between signed and
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// unsigned encodings, because ADDRESS has already been extended to 64
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// bits before it was passed to us.
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switch (encoding & 0x0f) {
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case dwarf2reader::DW_EH_PE_absptr:
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Address(address);
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break;
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case dwarf2reader::DW_EH_PE_uleb128:
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ULEB128(address);
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break;
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case dwarf2reader::DW_EH_PE_sleb128:
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LEB128(address);
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break;
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case dwarf2reader::DW_EH_PE_udata2:
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case dwarf2reader::DW_EH_PE_sdata2:
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D16(address);
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break;
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case dwarf2reader::DW_EH_PE_udata4:
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case dwarf2reader::DW_EH_PE_sdata4:
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D32(address);
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break;
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case dwarf2reader::DW_EH_PE_udata8:
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case dwarf2reader::DW_EH_PE_sdata8:
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D64(address);
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break;
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default:
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abort();
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}
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return *this;
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};
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const u_int32_t CFISection::kDwarf64InitialLengthMarker;
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const u_int32_t CFISection::kDwarf32CIEIdentifier;
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const u_int64_t CFISection::kDwarf64CIEIdentifier;
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const u_int32_t CFISection::kEHFrame32CIEIdentifier;
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const u_int64_t CFISection::kEHFrame64CIEIdentifier;
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} // namespace google_breakpad
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