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Diffstat (limited to 'toolkit/crashreporter/google-breakpad/src/processor/stackwalker_arm.cc')
| -rw-r--r-- | toolkit/crashreporter/google-breakpad/src/processor/stackwalker_arm.cc | 296 |
1 files changed, 0 insertions, 296 deletions
diff --git a/toolkit/crashreporter/google-breakpad/src/processor/stackwalker_arm.cc b/toolkit/crashreporter/google-breakpad/src/processor/stackwalker_arm.cc deleted file mode 100644 index e4fc58697..000000000 --- a/toolkit/crashreporter/google-breakpad/src/processor/stackwalker_arm.cc +++ /dev/null @@ -1,296 +0,0 @@ -// 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_arm.cc: arm-specific stackwalker. -// -// See stackwalker_arm.h for documentation. -// -// Author: Mark Mentovai, Ted Mielczarek, Jim Blandy - -#include <vector> - -#include "common/scoped_ptr.h" -#include "google_breakpad/processor/call_stack.h" -#include "google_breakpad/processor/memory_region.h" -#include "google_breakpad/processor/source_line_resolver_interface.h" -#include "google_breakpad/processor/stack_frame_cpu.h" -#include "processor/cfi_frame_info.h" -#include "processor/logging.h" -#include "processor/stackwalker_arm.h" - -namespace google_breakpad { - - -StackwalkerARM::StackwalkerARM(const SystemInfo* system_info, - const MDRawContextARM* context, - int fp_register, - MemoryRegion* memory, - const CodeModules* modules, - StackFrameSymbolizer* resolver_helper) - : Stackwalker(system_info, memory, modules, resolver_helper), - context_(context), fp_register_(fp_register), - context_frame_validity_(StackFrameARM::CONTEXT_VALID_ALL) { } - - -StackFrame* StackwalkerARM::GetContextFrame() { - if (!context_) { - BPLOG(ERROR) << "Can't get context frame without context"; - return NULL; - } - - StackFrameARM* frame = new StackFrameARM(); - - // The instruction pointer is stored directly in a register (r15), so pull it - // straight out of the CPU context structure. - frame->context = *context_; - frame->context_validity = context_frame_validity_; - frame->trust = StackFrame::FRAME_TRUST_CONTEXT; - frame->instruction = frame->context.iregs[MD_CONTEXT_ARM_REG_PC]; - - return frame; -} - -StackFrameARM* StackwalkerARM::GetCallerByCFIFrameInfo( - const vector<StackFrame*> &frames, - CFIFrameInfo* cfi_frame_info) { - StackFrameARM* last_frame = static_cast<StackFrameARM*>(frames.back()); - - static const char* register_names[] = { - "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", - "r8", "r9", "r10", "r11", "r12", "sp", "lr", "pc", - "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", - "fps", "cpsr", - NULL - }; - - // Populate a dictionary with the valid register values in last_frame. - CFIFrameInfo::RegisterValueMap<uint32_t> callee_registers; - for (int i = 0; register_names[i]; i++) - if (last_frame->context_validity & StackFrameARM::RegisterValidFlag(i)) - callee_registers[register_names[i]] = last_frame->context.iregs[i]; - - // Use the STACK CFI data to recover the caller's register values. - CFIFrameInfo::RegisterValueMap<uint32_t> caller_registers; - if (!cfi_frame_info->FindCallerRegs(callee_registers, *memory_, - &caller_registers)) - return NULL; - - // Construct a new stack frame given the values the CFI recovered. - scoped_ptr<StackFrameARM> frame(new StackFrameARM()); - for (int i = 0; register_names[i]; i++) { - CFIFrameInfo::RegisterValueMap<uint32_t>::iterator entry = - caller_registers.find(register_names[i]); - if (entry != caller_registers.end()) { - // We recovered the value of this register; fill the context with the - // value from caller_registers. - frame->context_validity |= StackFrameARM::RegisterValidFlag(i); - frame->context.iregs[i] = entry->second; - } else if (4 <= i && i <= 11 && (last_frame->context_validity & - StackFrameARM::RegisterValidFlag(i))) { - // If the STACK CFI data doesn't mention some callee-saves register, and - // it is valid in the callee, assume the callee has not yet changed it. - // Registers r4 through r11 are callee-saves, according to the Procedure - // Call Standard for the ARM Architecture, which the Linux ABI follows. - frame->context_validity |= StackFrameARM::RegisterValidFlag(i); - frame->context.iregs[i] = last_frame->context.iregs[i]; - } - } - // If the CFI doesn't recover the PC explicitly, then use .ra. - if (!(frame->context_validity & StackFrameARM::CONTEXT_VALID_PC)) { - CFIFrameInfo::RegisterValueMap<uint32_t>::iterator entry = - caller_registers.find(".ra"); - if (entry != caller_registers.end()) { - if (fp_register_ == -1) { - frame->context_validity |= StackFrameARM::CONTEXT_VALID_PC; - frame->context.iregs[MD_CONTEXT_ARM_REG_PC] = entry->second; - } else { - // The CFI updated the link register and not the program counter. - // Handle getting the program counter from the link register. - frame->context_validity |= StackFrameARM::CONTEXT_VALID_PC; - frame->context_validity |= StackFrameARM::CONTEXT_VALID_LR; - frame->context.iregs[MD_CONTEXT_ARM_REG_LR] = entry->second; - frame->context.iregs[MD_CONTEXT_ARM_REG_PC] = - last_frame->context.iregs[MD_CONTEXT_ARM_REG_LR]; - } - } - } - // If the CFI doesn't recover the SP explicitly, then use .cfa. - if (!(frame->context_validity & StackFrameARM::CONTEXT_VALID_SP)) { - CFIFrameInfo::RegisterValueMap<uint32_t>::iterator entry = - caller_registers.find(".cfa"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameARM::CONTEXT_VALID_SP; - frame->context.iregs[MD_CONTEXT_ARM_REG_SP] = entry->second; - } - } - - // If we didn't recover the PC and the SP, then the frame isn't very useful. - static const int essentials = (StackFrameARM::CONTEXT_VALID_SP - | StackFrameARM::CONTEXT_VALID_PC); - if ((frame->context_validity & essentials) != essentials) - return NULL; - - frame->trust = StackFrame::FRAME_TRUST_CFI; - return frame.release(); -} - -StackFrameARM* StackwalkerARM::GetCallerByStackScan( - const vector<StackFrame*> &frames) { - StackFrameARM* last_frame = static_cast<StackFrameARM*>(frames.back()); - uint32_t last_sp = last_frame->context.iregs[MD_CONTEXT_ARM_REG_SP]; - uint32_t caller_sp, caller_pc; - - if (!ScanForReturnAddress(last_sp, &caller_sp, &caller_pc, - frames.size() == 1 /* is_context_frame */)) { - // No plausible return address was found. - return NULL; - } - - // ScanForReturnAddress found a reasonable return address. Advance - // %sp to the location above the one where the return address was - // found. - caller_sp += 4; - - // Create a new stack frame (ownership will be transferred to the caller) - // and fill it in. - StackFrameARM* frame = new StackFrameARM(); - - frame->trust = StackFrame::FRAME_TRUST_SCAN; - frame->context = last_frame->context; - frame->context.iregs[MD_CONTEXT_ARM_REG_PC] = caller_pc; - frame->context.iregs[MD_CONTEXT_ARM_REG_SP] = caller_sp; - frame->context_validity = StackFrameARM::CONTEXT_VALID_PC | - StackFrameARM::CONTEXT_VALID_SP; - - return frame; -} - -StackFrameARM* StackwalkerARM::GetCallerByFramePointer( - const vector<StackFrame*> &frames) { - StackFrameARM* last_frame = static_cast<StackFrameARM*>(frames.back()); - - if (!(last_frame->context_validity & - StackFrameARM::RegisterValidFlag(fp_register_))) { - return NULL; - } - - uint32_t last_fp = last_frame->context.iregs[fp_register_]; - - uint32_t caller_fp = 0; - if (last_fp && !memory_->GetMemoryAtAddress(last_fp, &caller_fp)) { - BPLOG(ERROR) << "Unable to read caller_fp from last_fp: 0x" - << std::hex << last_fp; - return NULL; - } - - uint32_t caller_lr = 0; - if (last_fp && !memory_->GetMemoryAtAddress(last_fp + 4, &caller_lr)) { - BPLOG(ERROR) << "Unable to read caller_lr from last_fp + 4: 0x" - << std::hex << (last_fp + 4); - return NULL; - } - - uint32_t caller_sp = last_fp ? last_fp + 8 : - last_frame->context.iregs[MD_CONTEXT_ARM_REG_SP]; - - // Create a new stack frame (ownership will be transferred to the caller) - // and fill it in. - StackFrameARM* frame = new StackFrameARM(); - - frame->trust = StackFrame::FRAME_TRUST_FP; - frame->context = last_frame->context; - frame->context.iregs[fp_register_] = caller_fp; - frame->context.iregs[MD_CONTEXT_ARM_REG_SP] = caller_sp; - frame->context.iregs[MD_CONTEXT_ARM_REG_PC] = - last_frame->context.iregs[MD_CONTEXT_ARM_REG_LR]; - frame->context.iregs[MD_CONTEXT_ARM_REG_LR] = caller_lr; - frame->context_validity = StackFrameARM::CONTEXT_VALID_PC | - StackFrameARM::CONTEXT_VALID_LR | - StackFrameARM::RegisterValidFlag(fp_register_) | - StackFrameARM::CONTEXT_VALID_SP; - return frame; -} - -StackFrame* StackwalkerARM::GetCallerFrame(const CallStack* stack, - bool stack_scan_allowed) { - if (!memory_ || !stack) { - BPLOG(ERROR) << "Can't get caller frame without memory or stack"; - return NULL; - } - - const vector<StackFrame*> &frames = *stack->frames(); - StackFrameARM* last_frame = static_cast<StackFrameARM*>(frames.back()); - scoped_ptr<StackFrameARM> frame; - - // See if there is DWARF call frame information covering this address. - scoped_ptr<CFIFrameInfo> cfi_frame_info( - frame_symbolizer_->FindCFIFrameInfo(last_frame)); - if (cfi_frame_info.get()) - frame.reset(GetCallerByCFIFrameInfo(frames, cfi_frame_info.get())); - - // If CFI failed, or there wasn't CFI available, fall back - // to frame pointer, if this is configured. - if (fp_register_ >= 0 && !frame.get()) - frame.reset(GetCallerByFramePointer(frames)); - - // If everuthing failed, fall back to stack scanning. - if (stack_scan_allowed && !frame.get()) - frame.reset(GetCallerByStackScan(frames)); - - // If nothing worked, tell the caller. - if (!frame.get()) - return NULL; - - - // An instruction address of zero marks the end of the stack. - if (frame->context.iregs[MD_CONTEXT_ARM_REG_PC] == 0) - return NULL; - - // If the new stack pointer is at a lower address than the old, then - // that's clearly incorrect. Treat this as end-of-stack to enforce - // progress and avoid infinite loops. - if (frame->context.iregs[MD_CONTEXT_ARM_REG_SP] - < last_frame->context.iregs[MD_CONTEXT_ARM_REG_SP]) - return NULL; - - // The new frame's context's PC is the return address, which is one - // instruction past the instruction that caused us to arrive at the - // callee. Set new_frame->instruction to one less than the PC. This won't - // reference the beginning of the call instruction, but it's at least - // within it, which is sufficient to get the source line information to - // match up with the line that contains the function call. Callers that - // require the exact return address value may access - // frame->context.iregs[MD_CONTEXT_ARM_REG_PC]. - frame->instruction = frame->context.iregs[MD_CONTEXT_ARM_REG_PC] - 2; - - return frame.release(); -} - - -} // namespace google_breakpad |