summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorRemko Tronçon <git@el-tramo.be>2012-08-17 21:07:13 (GMT)
committerRemko Tronçon <git@el-tramo.be>2012-08-17 21:07:13 (GMT)
commit4397df6b409ca84f63838fa635fc2abe8af80b71 (patch)
tree0806d51a1aaa6a1f9ac00df318be72fbee19ec1d /3rdParty/Breakpad/src/common/mac/macho_reader.cc
parentead6c91f24d77de3319e77ae1354387407065ef1 (diff)
downloadswift-contrib-4397df6b409ca84f63838fa635fc2abe8af80b71.zip
swift-contrib-4397df6b409ca84f63838fa635fc2abe8af80b71.tar.bz2
Added Breakpad support for Windows.
Diffstat (limited to '3rdParty/Breakpad/src/common/mac/macho_reader.cc')
-rw-r--r--3rdParty/Breakpad/src/common/mac/macho_reader.cc530
1 files changed, 530 insertions, 0 deletions
diff --git a/3rdParty/Breakpad/src/common/mac/macho_reader.cc b/3rdParty/Breakpad/src/common/mac/macho_reader.cc
new file mode 100644
index 0000000..f1f0a17
--- /dev/null
+++ b/3rdParty/Breakpad/src/common/mac/macho_reader.cc
@@ -0,0 +1,530 @@
+// 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>
+
+// macho_reader.cc: Implementation of google_breakpad::Mach_O::FatReader and
+// google_breakpad::Mach_O::Reader. See macho_reader.h for details.
+
+#include "common/mac/macho_reader.h"
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+// Unfortunately, CPU_TYPE_ARM is not define for 10.4.
+#if !defined(CPU_TYPE_ARM)
+#define CPU_TYPE_ARM 12
+#endif
+
+namespace google_breakpad {
+namespace mach_o {
+
+// If NDEBUG is #defined, then the 'assert' macro doesn't evaluate its
+// arguments, so you can't place expressions that do necessary work in
+// the argument of an assert. Nor can you assign the result of the
+// expression to a variable and assert that the variable's value is
+// true: you'll get unused variable warnings when NDEBUG is #defined.
+//
+// ASSERT_ALWAYS_EVAL always evaluates its argument, and asserts that
+// the result is true if NDEBUG is not #defined.
+#if defined(NDEBUG)
+#define ASSERT_ALWAYS_EVAL(x) (x)
+#else
+#define ASSERT_ALWAYS_EVAL(x) assert(x)
+#endif
+
+void FatReader::Reporter::BadHeader() {
+ fprintf(stderr, "%s: file is neither a fat binary file"
+ " nor a Mach-O object file\n", filename_.c_str());
+}
+
+void FatReader::Reporter::TooShort() {
+ fprintf(stderr, "%s: file too short for the data it claims to contain\n",
+ filename_.c_str());
+}
+
+void FatReader::Reporter::MisplacedObjectFile() {
+ fprintf(stderr, "%s: file too short for the object files it claims"
+ " to contain\n", filename_.c_str());
+}
+
+bool FatReader::Read(const uint8_t *buffer, size_t size) {
+ buffer_.start = buffer;
+ buffer_.end = buffer + size;
+ ByteCursor cursor(&buffer_);
+
+ // Fat binaries always use big-endian, so read the magic number in
+ // that endianness. To recognize Mach-O magic numbers, which can use
+ // either endianness, check for both the proper and reversed forms
+ // of the magic numbers.
+ cursor.set_big_endian(true);
+ if (cursor >> magic_) {
+ if (magic_ == FAT_MAGIC) {
+ // How many object files does this fat binary contain?
+ uint32_t object_files_count;
+ if (!(cursor >> object_files_count)) { // nfat_arch
+ reporter_->TooShort();
+ return false;
+ }
+
+ // Read the list of object files.
+ object_files_.resize(object_files_count);
+ for (size_t i = 0; i < object_files_count; i++) {
+ struct fat_arch *objfile = &object_files_[i];
+
+ // Read this object file entry, byte-swapping as appropriate.
+ cursor >> objfile->cputype
+ >> objfile->cpusubtype
+ >> objfile->offset
+ >> objfile->size
+ >> objfile->align;
+ if (!cursor) {
+ reporter_->TooShort();
+ return false;
+ }
+ // Does the file actually have the bytes this entry refers to?
+ size_t fat_size = buffer_.Size();
+ if (objfile->offset > fat_size ||
+ objfile->size > fat_size - objfile->offset) {
+ reporter_->MisplacedObjectFile();
+ return false;
+ }
+ }
+
+ return true;
+ } else if (magic_ == MH_MAGIC || magic_ == MH_MAGIC_64 ||
+ magic_ == MH_CIGAM || magic_ == MH_CIGAM_64) {
+ // If this is a little-endian Mach-O file, fix the cursor's endianness.
+ if (magic_ == MH_CIGAM || magic_ == MH_CIGAM_64)
+ cursor.set_big_endian(false);
+ // Record the entire file as a single entry in the object file list.
+ object_files_.resize(1);
+
+ // Get the cpu type and subtype from the Mach-O header.
+ if (!(cursor >> object_files_[0].cputype
+ >> object_files_[0].cpusubtype)) {
+ reporter_->TooShort();
+ return false;
+ }
+
+ object_files_[0].offset = 0;
+ object_files_[0].size = static_cast<uint32_t>(buffer_.Size());
+ // This alignment is correct for 32 and 64-bit x86 and ppc.
+ // See get_align in the lipo source for other architectures:
+ // http://www.opensource.apple.com/source/cctools/cctools-773/misc/lipo.c
+ object_files_[0].align = 12; // 2^12 == 4096
+
+ return true;
+ }
+ }
+
+ reporter_->BadHeader();
+ return false;
+}
+
+void Reader::Reporter::BadHeader() {
+ fprintf(stderr, "%s: file is not a Mach-O object file\n", filename_.c_str());
+}
+
+void Reader::Reporter::CPUTypeMismatch(cpu_type_t cpu_type,
+ cpu_subtype_t cpu_subtype,
+ cpu_type_t expected_cpu_type,
+ cpu_subtype_t expected_cpu_subtype) {
+ fprintf(stderr, "%s: CPU type %d, subtype %d does not match expected"
+ " type %d, subtype %d\n",
+ filename_.c_str(), cpu_type, cpu_subtype,
+ expected_cpu_type, expected_cpu_subtype);
+}
+
+void Reader::Reporter::HeaderTruncated() {
+ fprintf(stderr, "%s: file does not contain a complete Mach-O header\n",
+ filename_.c_str());
+}
+
+void Reader::Reporter::LoadCommandRegionTruncated() {
+ fprintf(stderr, "%s: file too short to hold load command region"
+ " given in Mach-O header\n", filename_.c_str());
+}
+
+void Reader::Reporter::LoadCommandsOverrun(size_t claimed, size_t i,
+ LoadCommandType type) {
+ fprintf(stderr, "%s: file's header claims there are %ld"
+ " load commands, but load command #%ld",
+ filename_.c_str(), claimed, i);
+ if (type) fprintf(stderr, ", of type %d,", type);
+ fprintf(stderr, " extends beyond the end of the load command region\n");
+}
+
+void Reader::Reporter::LoadCommandTooShort(size_t i, LoadCommandType type) {
+ fprintf(stderr, "%s: the contents of load command #%ld, of type %d,"
+ " extend beyond the size given in the load command's header\n",
+ filename_.c_str(), i, type);
+}
+
+void Reader::Reporter::SectionsMissing(const string &name) {
+ fprintf(stderr, "%s: the load command for segment '%s'"
+ " is too short to hold the section headers it claims to have\n",
+ filename_.c_str(), name.c_str());
+}
+
+void Reader::Reporter::MisplacedSegmentData(const string &name) {
+ fprintf(stderr, "%s: the segment '%s' claims its contents lie beyond"
+ " the end of the file\n", filename_.c_str(), name.c_str());
+}
+
+void Reader::Reporter::MisplacedSectionData(const string &section,
+ const string &segment) {
+ fprintf(stderr, "%s: the section '%s' in segment '%s'"
+ " claims its contents lie outside the segment's contents\n",
+ filename_.c_str(), section.c_str(), segment.c_str());
+}
+
+void Reader::Reporter::MisplacedSymbolTable() {
+ fprintf(stderr, "%s: the LC_SYMTAB load command claims that the symbol"
+ " table's contents are located beyond the end of the file\n",
+ filename_.c_str());
+}
+
+void Reader::Reporter::UnsupportedCPUType(cpu_type_t cpu_type) {
+ fprintf(stderr, "%s: CPU type %d is not supported\n",
+ filename_.c_str(), cpu_type);
+}
+
+bool Reader::Read(const uint8_t *buffer,
+ size_t size,
+ cpu_type_t expected_cpu_type,
+ cpu_subtype_t expected_cpu_subtype) {
+ assert(!buffer_.start);
+ buffer_.start = buffer;
+ buffer_.end = buffer + size;
+ ByteCursor cursor(&buffer_, true);
+ uint32_t magic;
+ if (!(cursor >> magic)) {
+ reporter_->HeaderTruncated();
+ return false;
+ }
+
+ if (expected_cpu_type != CPU_TYPE_ANY) {
+ uint32_t expected_magic;
+ // validate that magic matches the expected cpu type
+ switch (expected_cpu_type) {
+ case CPU_TYPE_ARM:
+ case CPU_TYPE_I386:
+ expected_magic = MH_CIGAM;
+ break;
+ case CPU_TYPE_POWERPC:
+ expected_magic = MH_MAGIC;
+ break;
+ case CPU_TYPE_X86_64:
+ expected_magic = MH_CIGAM_64;
+ break;
+ case CPU_TYPE_POWERPC64:
+ expected_magic = MH_MAGIC_64;
+ break;
+ default:
+ reporter_->UnsupportedCPUType(expected_cpu_type);
+ return false;
+ }
+
+ if (expected_magic != magic) {
+ reporter_->BadHeader();
+ return false;
+ }
+ }
+
+ // Since the byte cursor is in big-endian mode, a reversed magic number
+ // always indicates a little-endian file, regardless of our own endianness.
+ switch (magic) {
+ case MH_MAGIC: big_endian_ = true; bits_64_ = false; break;
+ case MH_CIGAM: big_endian_ = false; bits_64_ = false; break;
+ case MH_MAGIC_64: big_endian_ = true; bits_64_ = true; break;
+ case MH_CIGAM_64: big_endian_ = false; bits_64_ = true; break;
+ default:
+ reporter_->BadHeader();
+ return false;
+ }
+ cursor.set_big_endian(big_endian_);
+ uint32_t commands_size, reserved;
+ cursor >> cpu_type_ >> cpu_subtype_ >> file_type_ >> load_command_count_
+ >> commands_size >> flags_;
+ if (bits_64_)
+ cursor >> reserved;
+ if (!cursor) {
+ reporter_->HeaderTruncated();
+ return false;
+ }
+
+ if (expected_cpu_type != CPU_TYPE_ANY &&
+ (expected_cpu_type != cpu_type_ ||
+ expected_cpu_subtype != cpu_subtype_)) {
+ reporter_->CPUTypeMismatch(cpu_type_, cpu_subtype_,
+ expected_cpu_type, expected_cpu_subtype);
+ return false;
+ }
+
+ cursor
+ .PointTo(&load_commands_.start, commands_size)
+ .PointTo(&load_commands_.end, 0);
+ if (!cursor) {
+ reporter_->LoadCommandRegionTruncated();
+ return false;
+ }
+
+ return true;
+}
+
+bool Reader::WalkLoadCommands(Reader::LoadCommandHandler *handler) const {
+ ByteCursor list_cursor(&load_commands_, big_endian_);
+
+ for (size_t index = 0; index < load_command_count_; ++index) {
+ // command refers to this load command alone, so that cursor will
+ // refuse to read past the load command's end. But since we haven't
+ // read the size yet, let command initially refer to the entire
+ // remainder of the load command series.
+ ByteBuffer command(list_cursor.here(), list_cursor.Available());
+ ByteCursor cursor(&command, big_endian_);
+
+ // Read the command type and size --- fields common to all commands.
+ uint32_t type, size;
+ if (!(cursor >> type)) {
+ reporter_->LoadCommandsOverrun(load_command_count_, index, 0);
+ return false;
+ }
+ if (!(cursor >> size) || size > command.Size()) {
+ reporter_->LoadCommandsOverrun(load_command_count_, index, type);
+ return false;
+ }
+
+ // Now that we've read the length, restrict command's range to this
+ // load command only.
+ command.end = command.start + size;
+
+ switch (type) {
+ case LC_SEGMENT:
+ case LC_SEGMENT_64: {
+ Segment segment;
+ segment.bits_64 = (type == LC_SEGMENT_64);
+ size_t word_size = segment.bits_64 ? 8 : 4;
+ cursor.CString(&segment.name, 16);
+ size_t file_offset, file_size;
+ cursor
+ .Read(word_size, false, &segment.vmaddr)
+ .Read(word_size, false, &segment.vmsize)
+ .Read(word_size, false, &file_offset)
+ .Read(word_size, false, &file_size);
+ cursor >> segment.maxprot
+ >> segment.initprot
+ >> segment.nsects
+ >> segment.flags;
+ if (!cursor) {
+ reporter_->LoadCommandTooShort(index, type);
+ return false;
+ }
+ if (file_offset > buffer_.Size() ||
+ file_size > buffer_.Size() - file_offset) {
+ reporter_->MisplacedSegmentData(segment.name);
+ return false;
+ }
+ // Mach-O files in .dSYM bundles have the contents of the loaded
+ // segments removed, and their file offsets and file sizes zeroed
+ // out. To help us handle this special case properly, give such
+ // segments' contents NULL starting and ending pointers.
+ if (file_offset == 0 && file_size == 0) {
+ segment.contents.start = segment.contents.end = NULL;
+ } else {
+ segment.contents.start = buffer_.start + file_offset;
+ segment.contents.end = segment.contents.start + file_size;
+ }
+ // The section list occupies the remainder of this load command's space.
+ segment.section_list.start = cursor.here();
+ segment.section_list.end = command.end;
+
+ if (!handler->SegmentCommand(segment))
+ return false;
+ break;
+ }
+
+ case LC_SYMTAB: {
+ uint32_t symoff, nsyms, stroff, strsize;
+ cursor >> symoff >> nsyms >> stroff >> strsize;
+ if (!cursor) {
+ reporter_->LoadCommandTooShort(index, type);
+ return false;
+ }
+ // How big are the entries in the symbol table?
+ // sizeof(struct nlist_64) : sizeof(struct nlist),
+ // but be paranoid about alignment vs. target architecture.
+ size_t symbol_size = bits_64_ ? 16 : 12;
+ // How big is the entire symbol array?
+ size_t symbols_size = nsyms * symbol_size;
+ if (symoff > buffer_.Size() || symbols_size > buffer_.Size() - symoff ||
+ stroff > buffer_.Size() || strsize > buffer_.Size() - stroff) {
+ reporter_->MisplacedSymbolTable();
+ return false;
+ }
+ ByteBuffer entries(buffer_.start + symoff, symbols_size);
+ ByteBuffer names(buffer_.start + stroff, strsize);
+ if (!handler->SymtabCommand(entries, names))
+ return false;
+ break;
+ }
+
+ default: {
+ if (!handler->UnknownCommand(type, command))
+ return false;
+ break;
+ }
+ }
+
+ list_cursor.set_here(command.end);
+ }
+
+ return true;
+}
+
+// A load command handler that looks for a segment of a given name.
+class Reader::SegmentFinder : public LoadCommandHandler {
+ public:
+ // Create a load command handler that looks for a segment named NAME,
+ // and sets SEGMENT to describe it if found.
+ SegmentFinder(const string &name, Segment *segment)
+ : name_(name), segment_(segment), found_() { }
+
+ // Return true if the traversal found the segment, false otherwise.
+ bool found() const { return found_; }
+
+ bool SegmentCommand(const Segment &segment) {
+ if (segment.name == name_) {
+ *segment_ = segment;
+ found_ = true;
+ return false;
+ }
+ return true;
+ }
+
+ private:
+ // The name of the segment our creator is looking for.
+ const string &name_;
+
+ // Where we should store the segment if found. (WEAK)
+ Segment *segment_;
+
+ // True if we found the segment.
+ bool found_;
+};
+
+bool Reader::FindSegment(const string &name, Segment *segment) const {
+ SegmentFinder finder(name, segment);
+ WalkLoadCommands(&finder);
+ return finder.found();
+}
+
+bool Reader::WalkSegmentSections(const Segment &segment,
+ SectionHandler *handler) const {
+ size_t word_size = segment.bits_64 ? 8 : 4;
+ ByteCursor cursor(&segment.section_list, big_endian_);
+
+ for (size_t i = 0; i < segment.nsects; i++) {
+ Section section;
+ section.bits_64 = segment.bits_64;
+ uint64_t size;
+ uint32_t offset, dummy32;
+ cursor
+ .CString(&section.section_name, 16)
+ .CString(&section.segment_name, 16)
+ .Read(word_size, false, &section.address)
+ .Read(word_size, false, &size)
+ >> offset
+ >> section.align
+ >> dummy32
+ >> dummy32
+ >> section.flags
+ >> dummy32
+ >> dummy32;
+ if (section.bits_64)
+ cursor >> dummy32;
+ if (!cursor) {
+ reporter_->SectionsMissing(segment.name);
+ return false;
+ }
+ if ((section.flags & SECTION_TYPE) == S_ZEROFILL) {
+ // Zero-fill sections have a size, but no contents.
+ section.contents.start = section.contents.end = NULL;
+ } else if (segment.contents.start == NULL &&
+ segment.contents.end == NULL) {
+ // Mach-O files in .dSYM bundles have the contents of the loaded
+ // segments removed, and their file offsets and file sizes zeroed
+ // out. However, the sections within those segments still have
+ // non-zero sizes. There's no reason to call MisplacedSectionData in
+ // this case; the caller may just need the section's load
+ // address. But do set the contents' limits to NULL, for safety.
+ section.contents.start = section.contents.end = NULL;
+ } else {
+ if (offset < size_t(segment.contents.start - buffer_.start) ||
+ offset > size_t(segment.contents.end - buffer_.start) ||
+ size > size_t(segment.contents.end - buffer_.start - offset)) {
+ reporter_->MisplacedSectionData(section.section_name,
+ section.segment_name);
+ return false;
+ }
+ section.contents.start = buffer_.start + offset;
+ section.contents.end = section.contents.start + size;
+ }
+ if (!handler->HandleSection(section))
+ return false;
+ }
+ return true;
+}
+
+// A SectionHandler that builds a SectionMap for the sections within a
+// given segment.
+class Reader::SectionMapper: public SectionHandler {
+ public:
+ // Create a SectionHandler that populates MAP with an entry for
+ // each section it is given.
+ SectionMapper(SectionMap *map) : map_(map) { }
+ bool HandleSection(const Section &section) {
+ (*map_)[section.section_name] = section;
+ return true;
+ }
+ private:
+ // The map under construction. (WEAK)
+ SectionMap *map_;
+};
+
+bool Reader::MapSegmentSections(const Segment &segment,
+ SectionMap *section_map) const {
+ section_map->clear();
+ SectionMapper mapper(section_map);
+ return WalkSegmentSections(segment, &mapper);
+}
+
+} // namespace mach_o
+} // namespace google_breakpad