1 // Copyright (c) 2010 Google Inc. 2 // All rights reserved. 3 // 4 // Redistribution and use in source and binary forms, with or without 5 // modification, are permitted provided that the following conditions are 6 // met: 7 // 8 // * Redistributions of source code must retain the above copyright 9 // notice, this list of conditions and the following disclaimer. 10 // * Redistributions in binary form must reproduce the above 11 // copyright notice, this list of conditions and the following disclaimer 12 // in the documentation and/or other materials provided with the 13 // distribution. 14 // * Neither the name of Google Inc. nor the names of its 15 // contributors may be used to endorse or promote products derived from 16 // this software without specific prior written permission. 17 // 18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 30 // stackwalker_sparc.cc: sparc-specific stackwalker. 31 // 32 // See stackwalker_sparc.h for documentation. 33 // 34 // Author: Michael Shang 35 36 37 #include "google_breakpad/processor/call_stack.h" 38 #include "google_breakpad/processor/memory_region.h" 39 #include "google_breakpad/processor/stack_frame_cpu.h" 40 #include "processor/logging.h" 41 #include "processor/stackwalker_sparc.h" 42 43 namespace google_breakpad { 44 45 46 StackwalkerSPARC::StackwalkerSPARC(const SystemInfo* system_info, 47 const MDRawContextSPARC* context, 48 MemoryRegion* memory, 49 const CodeModules* modules, 50 StackFrameSymbolizer* resolver_helper) 51 : Stackwalker(system_info, memory, modules, resolver_helper), 52 context_(context) { 53 } 54 55 56 StackFrame* StackwalkerSPARC::GetContextFrame() { 57 if (!context_) { 58 BPLOG(ERROR) << "Can't get context frame without context"; 59 return NULL; 60 } 61 62 StackFrameSPARC* frame = new StackFrameSPARC(); 63 64 // The instruction pointer is stored directly in a register, so pull it 65 // straight out of the CPU context structure. 66 frame->context = *context_; 67 frame->context_validity = StackFrameSPARC::CONTEXT_VALID_ALL; 68 frame->trust = StackFrame::FRAME_TRUST_CONTEXT; 69 frame->instruction = frame->context.pc; 70 71 return frame; 72 } 73 74 75 StackFrame* StackwalkerSPARC::GetCallerFrame(const CallStack* stack, 76 bool stack_scan_allowed) { 77 if (!memory_ || !stack) { 78 BPLOG(ERROR) << "Can't get caller frame without memory or stack"; 79 return NULL; 80 } 81 82 StackFrameSPARC* last_frame = static_cast<StackFrameSPARC*>( 83 stack->frames()->back()); 84 85 // new: caller 86 // old: callee 87 // %fp, %i6 and g_r[30] is the same, see minidump_format.h 88 // %sp, %o6 and g_r[14] is the same, see minidump_format.h 89 // %sp_new = %fp_old 90 // %fp_new = *(%fp_old + 32 + 32 - 8), where the callee's %i6 91 // %pc_new = *(%fp_old + 32 + 32 - 4) + 8 92 // which is callee's %i7 plus 8 93 94 // A caller frame must reside higher in memory than its callee frames. 95 // Anything else is an error, or an indication that we've reached the 96 // end of the stack. 97 uint64_t stack_pointer = last_frame->context.g_r[30]; 98 if (stack_pointer <= last_frame->context.g_r[14]) { 99 return NULL; 100 } 101 102 uint32_t instruction; 103 if (!memory_->GetMemoryAtAddress(stack_pointer + 60, 104 &instruction) || instruction <= 1) { 105 return NULL; 106 } 107 108 uint32_t stack_base; 109 if (!memory_->GetMemoryAtAddress(stack_pointer + 56, 110 &stack_base) || stack_base <= 1) { 111 return NULL; 112 } 113 114 StackFrameSPARC* frame = new StackFrameSPARC(); 115 116 frame->context = last_frame->context; 117 frame->context.g_r[14] = stack_pointer; 118 frame->context.g_r[30] = stack_base; 119 120 // frame->context.pc is the return address, which is 2 instruction 121 // past the branch that caused us to arrive at the callee, which are 122 // a CALL instruction then a NOP instruction. 123 // frame_ppc->instruction to 8 less than that. Since all sparc 124 // instructions are 4 bytes wide, this is the address of the branch 125 // instruction. This allows source line information to match up with the 126 // line that contains a function call. Callers that require the exact 127 // return address value may access the %i7/g_r[31] field of StackFrameSPARC. 128 frame->context.pc = instruction + 8; 129 frame->instruction = instruction; 130 frame->context_validity = StackFrameSPARC::CONTEXT_VALID_PC | 131 StackFrameSPARC::CONTEXT_VALID_SP | 132 StackFrameSPARC::CONTEXT_VALID_FP; 133 frame->trust = StackFrame::FRAME_TRUST_FP; 134 135 return frame; 136 } 137 138 139 } // namespace google_breakpad 140
