The Tor Browser: comparison toolkit/crashreporter/google-breakpad/src/processor/stackwalker

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+:934e80c36410
+// 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.
+// stackwalker_sparc.cc: sparc-specific stackwalker.
+//
+// See stackwalker_sparc.h for documentation.
+//
+// Author: Michael Shang
+#include "google_breakpad/processor/call_stack.h"
+#include "google_breakpad/processor/memory_region.h"
+#include "google_breakpad/processor/stack_frame_cpu.h"
+#include "common/logging.h"
+#include "processor/stackwalker_sparc.h"
+namespace google_breakpad {
+StackwalkerSPARC::StackwalkerSPARC(const SystemInfo* system_info,
+const MDRawContextSPARC* context,
+MemoryRegion* memory,
+const CodeModules* modules,
+StackFrameSymbolizer* resolver_helper)
+: Stackwalker(system_info, memory, modules, resolver_helper),
+context_(context) {
+}
+StackFrame* StackwalkerSPARC::GetContextFrame() {
+if (!context_) {
+BPLOG(ERROR) << "Can't get context frame without context";
+return NULL;
+}
+StackFrameSPARC* frame = new StackFrameSPARC();
+// The instruction pointer is stored directly in a register, so pull it
+// straight out of the CPU context structure.
+frame->context = *context_;
+frame->context_validity = StackFrameSPARC::CONTEXT_VALID_ALL;
+frame->trust = StackFrame::FRAME_TRUST_CONTEXT;
+frame->instruction = frame->context.pc;
+return frame;
+}
+StackFrame* StackwalkerSPARC::GetCallerFrame(const CallStack* stack,
+bool stack_scan_allowed) {
+if (!memory_ || !stack) {
+BPLOG(ERROR) << "Can't get caller frame without memory or stack";
+return NULL;
+}
+StackFrameSPARC* last_frame = static_cast<StackFrameSPARC*>(
+stack->frames()->back());
+// new: caller
+// old: callee
+// %fp, %i6 and g_r[30] is the same, see minidump_format.h
+// %sp, %o6 and g_r[14] is the same, see minidump_format.h
+// %sp_new = %fp_old
+// %fp_new = *(%fp_old + 32 + 32 - 8), where the callee's %i6
+// %pc_new = *(%fp_old + 32 + 32 - 4) + 8
+// which is callee's %i7 plus 8
+// A caller frame must reside higher in memory than its callee frames.
+// Anything else is an error, or an indication that we've reached the
+// end of the stack.
+uint64_t stack_pointer = last_frame->context.g_r[30];
+if (stack_pointer <= last_frame->context.g_r[14]) {
+return NULL;
+}
+uint32_t instruction;
+if (!memory_->GetMemoryAtAddress(stack_pointer + 60,
+&instruction) || instruction <= 1) {
+return NULL;
+}
+uint32_t stack_base;
+if (!memory_->GetMemoryAtAddress(stack_pointer + 56,
+&stack_base) || stack_base <= 1) {
+return NULL;
+}
+StackFrameSPARC* frame = new StackFrameSPARC();
+frame->context = last_frame->context;
+frame->context.g_r[14] = stack_pointer;
+frame->context.g_r[30] = stack_base;
+// frame->context.pc is the return address, which is 2 instruction
+// past the branch that caused us to arrive at the callee, which are
+// a CALL instruction then a NOP instruction.
+// frame_ppc->instruction to 8 less than that.  Since all sparc
+// instructions are 4 bytes wide, this is the address of the branch
+// instruction.  This allows source line information to match up with the
+// line that contains a function call.  Callers that require the exact
+// return address value may access the %i7/g_r[31] field of StackFrameSPARC.
+frame->context.pc = instruction + 8;
+frame->instruction = instruction;
+frame->context_validity = StackFrameSPARC::CONTEXT_VALID_PC |
+StackFrameSPARC::CONTEXT_VALID_SP |
+StackFrameSPARC::CONTEXT_VALID_FP;
+frame->trust = StackFrame::FRAME_TRUST_FP;
+return frame;
+}
+}  // namespace google_breakpad

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comparison: toolkit/crashreporter/google-breakpad/src/processor/stackwalker_sparc.cc

toolkit/crashreporter/google-breakpad/src/processor/stackwalker_sparc.cc