toolkit/crashreporter/google-breakpad/src/processor/stackwalker_ppc.cc@6474c204b198 (annotated)
toolkit/crashreporter/google-breakpad/src/processor/stackwalker_ppc.cc
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | // Copyright (c) 2010 Google Inc. |
| michael@0 | 2 | // All rights reserved. |
| michael@0 | 3 | // |
| michael@0 | 4 | // Redistribution and use in source and binary forms, with or without |
| michael@0 | 5 | // modification, are permitted provided that the following conditions are |
| michael@0 | 6 | // met: |
| michael@0 | 7 | // |
| michael@0 | 8 | // * Redistributions of source code must retain the above copyright |
| michael@0 | 9 | // notice, this list of conditions and the following disclaimer. |
| michael@0 | 10 | // * Redistributions in binary form must reproduce the above |
| michael@0 | 11 | // copyright notice, this list of conditions and the following disclaimer |
| michael@0 | 12 | // in the documentation and/or other materials provided with the |
| michael@0 | 13 | // distribution. |
| michael@0 | 14 | // * Neither the name of Google Inc. nor the names of its |
| michael@0 | 15 | // contributors may be used to endorse or promote products derived from |
| michael@0 | 16 | // this software without specific prior written permission. |
| michael@0 | 17 | // |
| michael@0 | 18 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| michael@0 | 19 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| michael@0 | 20 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| michael@0 | 21 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| michael@0 | 22 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| michael@0 | 23 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| michael@0 | 24 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| michael@0 | 25 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| michael@0 | 26 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| michael@0 | 27 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| michael@0 | 28 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| michael@0 | 29 | |
| michael@0 | 30 | // stackwalker_ppc.cc: ppc-specific stackwalker. |
| michael@0 | 31 | // |
| michael@0 | 32 | // See stackwalker_ppc.h for documentation. |
| michael@0 | 33 | // |
| michael@0 | 34 | // Author: Mark Mentovai |
| michael@0 | 35 | |
| michael@0 | 36 | |
| michael@0 | 37 | #include "processor/stackwalker_ppc.h" |
| michael@0 | 38 | #include "google_breakpad/processor/call_stack.h" |
| michael@0 | 39 | #include "google_breakpad/processor/memory_region.h" |
| michael@0 | 40 | #include "google_breakpad/processor/stack_frame_cpu.h" |
| michael@0 | 41 | #include "common/logging.h" |
| michael@0 | 42 | |
| michael@0 | 43 | namespace google_breakpad { |
| michael@0 | 44 | |
| michael@0 | 45 | |
| michael@0 | 46 | StackwalkerPPC::StackwalkerPPC(const SystemInfo* system_info, |
| michael@0 | 47 | const MDRawContextPPC* context, |
| michael@0 | 48 | MemoryRegion* memory, |
| michael@0 | 49 | const CodeModules* modules, |
| michael@0 | 50 | StackFrameSymbolizer* resolver_helper) |
| michael@0 | 51 | : Stackwalker(system_info, memory, modules, resolver_helper), |
| michael@0 | 52 | context_(context) { |
| michael@0 | 53 | if (memory_ && memory_->GetBase() + memory_->GetSize() - 1 > 0xffffffff) { |
| michael@0 | 54 | // This implementation only covers 32-bit ppc CPUs. The limits of the |
| michael@0 | 55 | // supplied stack are invalid. Mark memory_ = NULL, which will cause |
| michael@0 | 56 | // stackwalking to fail. |
| michael@0 | 57 | BPLOG(ERROR) << "Memory out of range for stackwalking: " << |
| michael@0 | 58 | HexString(memory_->GetBase()) << "+" << |
| michael@0 | 59 | HexString(memory_->GetSize()); |
| michael@0 | 60 | memory_ = NULL; |
| michael@0 | 61 | } |
| michael@0 | 62 | } |
| michael@0 | 63 | |
| michael@0 | 64 | |
| michael@0 | 65 | StackFrame* StackwalkerPPC::GetContextFrame() { |
| michael@0 | 66 | if (!context_) { |
| michael@0 | 67 | BPLOG(ERROR) << "Can't get context frame without context"; |
| michael@0 | 68 | return NULL; |
| michael@0 | 69 | } |
| michael@0 | 70 | |
| michael@0 | 71 | StackFramePPC* frame = new StackFramePPC(); |
| michael@0 | 72 | |
| michael@0 | 73 | // The instruction pointer is stored directly in a register, so pull it |
| michael@0 | 74 | // straight out of the CPU context structure. |
| michael@0 | 75 | frame->context = *context_; |
| michael@0 | 76 | frame->context_validity = StackFramePPC::CONTEXT_VALID_ALL; |
| michael@0 | 77 | frame->trust = StackFrame::FRAME_TRUST_CONTEXT; |
| michael@0 | 78 | frame->instruction = frame->context.srr0; |
| michael@0 | 79 | |
| michael@0 | 80 | return frame; |
| michael@0 | 81 | } |
| michael@0 | 82 | |
| michael@0 | 83 | |
| michael@0 | 84 | StackFrame* StackwalkerPPC::GetCallerFrame(const CallStack* stack, |
| michael@0 | 85 | bool stack_scan_allowed) { |
| michael@0 | 86 | if (!memory_ || !stack) { |
| michael@0 | 87 | BPLOG(ERROR) << "Can't get caller frame without memory or stack"; |
| michael@0 | 88 | return NULL; |
| michael@0 | 89 | } |
| michael@0 | 90 | |
| michael@0 | 91 | // The instruction pointers for previous frames are saved on the stack. |
| michael@0 | 92 | // The typical ppc calling convention is for the called procedure to store |
| michael@0 | 93 | // its return address in the calling procedure's stack frame at 8(%r1), |
| michael@0 | 94 | // and to allocate its own stack frame by decrementing %r1 (the stack |
| michael@0 | 95 | // pointer) and saving the old value of %r1 at 0(%r1). Because the ppc has |
| michael@0 | 96 | // no hardware stack, there is no distinction between the stack pointer and |
| michael@0 | 97 | // frame pointer, and what is typically thought of as the frame pointer on |
| michael@0 | 98 | // an x86 is usually referred to as the stack pointer on a ppc. |
| michael@0 | 99 | |
| michael@0 | 100 | StackFramePPC* last_frame = static_cast<StackFramePPC*>( |
| michael@0 | 101 | stack->frames()->back()); |
| michael@0 | 102 | |
| michael@0 | 103 | // A caller frame must reside higher in memory than its callee frames. |
| michael@0 | 104 | // Anything else is an error, or an indication that we've reached the |
| michael@0 | 105 | // end of the stack. |
| michael@0 | 106 | uint32_t stack_pointer; |
| michael@0 | 107 | if (!memory_->GetMemoryAtAddress(last_frame->context.gpr[1], |
| michael@0 | 108 | &stack_pointer) || |
| michael@0 | 109 | stack_pointer <= last_frame->context.gpr[1]) { |
| michael@0 | 110 | return NULL; |
| michael@0 | 111 | } |
| michael@0 | 112 | |
| michael@0 | 113 | // Mac OS X/Darwin gives 1 as the return address from the bottom-most |
| michael@0 | 114 | // frame in a stack (a thread's entry point). I haven't found any |
| michael@0 | 115 | // documentation on this, but 0 or 1 would be bogus return addresses, |
| michael@0 | 116 | // so check for them here and return false (end of stack) when they're |
| michael@0 | 117 | // hit to avoid having a phantom frame. |
| michael@0 | 118 | uint32_t instruction; |
| michael@0 | 119 | if (!memory_->GetMemoryAtAddress(stack_pointer + 8, &instruction) || |
| michael@0 | 120 | instruction <= 1) { |
| michael@0 | 121 | return NULL; |
| michael@0 | 122 | } |
| michael@0 | 123 | |
| michael@0 | 124 | StackFramePPC* frame = new StackFramePPC(); |
| michael@0 | 125 | |
| michael@0 | 126 | frame->context = last_frame->context; |
| michael@0 | 127 | frame->context.srr0 = instruction; |
| michael@0 | 128 | frame->context.gpr[1] = stack_pointer; |
| michael@0 | 129 | frame->context_validity = StackFramePPC::CONTEXT_VALID_SRR0 | |
| michael@0 | 130 | StackFramePPC::CONTEXT_VALID_GPR1; |
| michael@0 | 131 | frame->trust = StackFrame::FRAME_TRUST_FP; |
| michael@0 | 132 | |
| michael@0 | 133 | // frame->context.srr0 is the return address, which is one instruction |
| michael@0 | 134 | // past the branch that caused us to arrive at the callee. Set |
| michael@0 | 135 | // frame_ppc->instruction to four less than that. Since all ppc |
| michael@0 | 136 | // instructions are 4 bytes wide, this is the address of the branch |
| michael@0 | 137 | // instruction. This allows source line information to match up with the |
| michael@0 | 138 | // line that contains a function call. Callers that require the exact |
| michael@0 | 139 | // return address value may access the context.srr0 field of StackFramePPC. |
| michael@0 | 140 | frame->instruction = frame->context.srr0 - 4; |
| michael@0 | 141 | |
| michael@0 | 142 | return frame; |
| michael@0 | 143 | } |
| michael@0 | 144 | |
| michael@0 | 145 | |
| michael@0 | 146 | } // namespace google_breakpad |
