1 files changed, 164 insertions, 0 deletions
diff --git a/src/client/ios/handler/ios_exception_minidump_generator.mm b/src/client/ios/handler/ios_exception_minidump_generator.mm
new file mode 100644
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--- /dev/null
+++ b/src/client/ios/handler/ios_exception_minidump_generator.mm
@@ -0,0 +1,164 @@
+// Copyright (c) 2012, 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.
+
+#include "client/ios/handler/ios_exception_minidump_generator.h"
+
+#include "processor/scoped_ptr.h"
+
+namespace {
+
+const uint32_t kExpectedFinalFp = 4;
+const uint32_t kExpectedFinalSp = 0;
+const int kExceptionType = EXC_SOFTWARE;
+const int kExceptionCode = 0xDEADBEEF;
+
+// Append the given 4 bytes value to the sp position of the stack represented
+// by memory.
+void AppendToMemory(uint8_t *memory, uint32_t sp, uint32_t data) {
+  assert(sizeof(data) == 4);
+  memcpy(memory + sp, &data, sizeof(data));
+}
+
+}  // namespace
+
+namespace google_breakpad {
+
+IosExceptionMinidumpGenerator::IosExceptionMinidumpGenerator(
+    NSException *exception)
+    : MinidumpGenerator(mach_task_self(), 0) {
+  return_addresses_ = [[exception callStackReturnAddresses] retain];
+  SetExceptionInformation(kExceptionType,
+                          kExceptionCode,
+                          0,
+                          pthread_mach_thread_np(pthread_self()));
+}
+
+IosExceptionMinidumpGenerator::~IosExceptionMinidumpGenerator() {
+  [return_addresses_ release];
+}
+
+bool IosExceptionMinidumpGenerator::WriteCrashingContext(
+    MDLocationDescriptor *register_location) {
+#ifdef HAS_ARM_SUPPORT
+  TypedMDRVA<MDRawContextARM> context(&writer_);
+  if (!context.Allocate())
+    return false;
+  *register_location = context.location();
+  MDRawContextARM *context_ptr = context.get();
+  memset(context_ptr, 0, sizeof(MDRawContextARM));
+  context_ptr->context_flags = MD_CONTEXT_ARM_FULL;
+  context_ptr->iregs[7] = kExpectedFinalFp;  // FP
+  context_ptr->iregs[13] = kExpectedFinalSp;  // SP
+  uint32_t pc = GetPCFromException();
+  context_ptr->iregs[14] = pc;  // LR
+  context_ptr->iregs[15] = pc;  // PC
+  return true;
+#else
+  assert(false);
+  return false;
+#endif
+}
+
+uint32_t IosExceptionMinidumpGenerator::GetPCFromException() {
+  return [[return_addresses_ objectAtIndex:0] unsignedIntegerValue];
+}
+
+bool IosExceptionMinidumpGenerator::WriteExceptionStream(
+    MDRawDirectory *exception_stream) {
+#ifdef HAS_ARM_SUPPORT
+  TypedMDRVA<MDRawExceptionStream> exception(&writer_);
+
+  if (!exception.Allocate())
+    return false;
+
+  exception_stream->stream_type = MD_EXCEPTION_STREAM;
+  exception_stream->location = exception.location();
+  MDRawExceptionStream *exception_ptr = exception.get();
+  exception_ptr->thread_id = pthread_mach_thread_np(pthread_self());
+
+  // This naming is confusing, but it is the proper translation from
+  // mach naming to minidump naming.
+  exception_ptr->exception_record.exception_code = kExceptionType;
+  exception_ptr->exception_record.exception_flags = kExceptionCode;
+
+  if (!WriteCrashingContext(&exception_ptr->thread_context))
+    return false;
+
+  exception_ptr->exception_record.exception_address = GetPCFromException();
+  return true;
+#else
+  return MinidumpGenerator::WriteExceptionStream(exception_stream);
+#endif
+}
+
+bool IosExceptionMinidumpGenerator::WriteThreadStream(mach_port_t thread_id,
+                                                      MDRawThread *thread) {
+#ifdef HAS_ARM_SUPPORT
+  if (pthread_mach_thread_np(pthread_self()) != thread_id)
+    return MinidumpGenerator::WriteThreadStream(thread_id, thread);
+
+  size_t frame_count = [return_addresses_ count];
+  UntypedMDRVA memory(&writer_);
+  size_t size = 8 * (frame_count - 1) + 4;
+  if (!memory.Allocate(size))
+    return false;
+  scoped_array<uint8_t> stack_memory(new uint8_t[size]);
+  uint32_t sp = size - 4;
+  uint32_t fp = 0;
+  uint32_t lr = [[return_addresses_ lastObject] unsignedIntegerValue];
+  for (int current_frame = frame_count - 2;
+       current_frame >= 0;
+       --current_frame) {
+    AppendToMemory(stack_memory.get(), sp, fp);
+    sp -= 4;
+    fp = sp;
+    AppendToMemory(stack_memory.get(), sp, lr);
+    sp -= 4;
+    lr = [[return_addresses_ objectAtIndex:current_frame] unsignedIntegerValue];
+  }
+  if (!memory.Copy(stack_memory.get(), size))
+    return false;
+  assert(sp == kExpectedFinalSp);
+  assert(fp == kExpectedFinalFp);
+  assert(lr == GetPCFromException());
+  thread->stack.start_of_memory_range = sp;
+  thread->stack.memory = memory.location();
+  memory_blocks_.push_back(thread->stack);
+
+  if (!WriteCrashingContext(&thread->thread_context))
+    return false;
+
+  thread->thread_id = thread_id;
+  return true;
+#else
+  return MinidumpGenerator::WriteThreadStream(thread_id, thread);
+#endif
+}
+
+}  // namespace google_breakpad