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R=jimb at http://breakpad.appspot.com/205001/show git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@703 4c0a9323-5329-0410-9bdc-e9ce6186880e
188 lines
8 KiB
C++
188 lines
8 KiB
C++
// Copyright (c) 2010 Google Inc.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// stackwalker_arm.cc: arm-specific stackwalker.
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//
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// See stackwalker_arm.h for documentation.
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//
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// Author: Mark Mentovai, Ted Mielczarek, Jim Blandy
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#include "google_breakpad/processor/call_stack.h"
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#include "google_breakpad/processor/memory_region.h"
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#include "google_breakpad/processor/source_line_resolver_interface.h"
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#include "google_breakpad/processor/stack_frame_cpu.h"
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#include "processor/cfi_frame_info.h"
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#include "processor/logging.h"
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#include "processor/scoped_ptr.h"
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#include "processor/stackwalker_arm.h"
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namespace google_breakpad {
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StackwalkerARM::StackwalkerARM(const SystemInfo *system_info,
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const MDRawContextARM *context,
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MemoryRegion *memory,
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const CodeModules *modules,
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SymbolSupplier *supplier,
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SourceLineResolverInterface *resolver)
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: Stackwalker(system_info, memory, modules, supplier, resolver),
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context_(context),
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context_frame_validity_(StackFrameARM::CONTEXT_VALID_ALL) { }
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StackFrame* StackwalkerARM::GetContextFrame() {
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if (!context_ || !memory_) {
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BPLOG(ERROR) << "Can't get context frame without context or memory";
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return NULL;
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}
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StackFrameARM *frame = new StackFrameARM();
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// The instruction pointer is stored directly in a register (r15), so pull it
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// straight out of the CPU context structure.
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frame->context = *context_;
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frame->context_validity = context_frame_validity_;
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frame->trust = StackFrame::FRAME_TRUST_CONTEXT;
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frame->instruction = frame->context.iregs[15];
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return frame;
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}
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StackFrame* StackwalkerARM::GetCallerFrame(const CallStack *stack) {
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if (!memory_ || !stack) {
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BPLOG(ERROR) << "Can't get caller frame without memory or stack";
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return NULL;
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}
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const vector<StackFrame *> &frames = *stack->frames();
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StackFrameARM *last_frame = static_cast<StackFrameARM *>(frames.back());
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// See if we have DWARF call frame information covering this address.
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scoped_ptr<CFIFrameInfo> cfi_frame_info(resolver_
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->FindCFIFrameInfo(last_frame));
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if (cfi_frame_info == NULL)
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// Unfortunately, CFI is our only option on the ARM for now. If we
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// add a second strategy, we should put each one in its own function.
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return NULL;
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static const char *register_names[] = {
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"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
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"r8", "r9", "r10", "r11", "r12", "sp", "lr", "pc",
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"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
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"fps", "cpsr",
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NULL
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};
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// Populate a dictionary with the valid register values in last_frame.
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CFIFrameInfo::RegisterValueMap<u_int32_t> callee_registers;
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for (int i = 0; register_names[i]; i++)
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if (last_frame->context_validity & StackFrameARM::RegisterValidFlag(i))
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callee_registers[register_names[i]] = last_frame->context.iregs[i];
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// Use the STACK CFI data to recover the caller's register values.
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CFIFrameInfo::RegisterValueMap<u_int32_t> caller_registers;
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if (!cfi_frame_info->FindCallerRegs(callee_registers, *memory_,
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&caller_registers))
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return NULL;
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// Construct a new stack frame given the values the CFI recovered.
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scoped_ptr<StackFrameARM> frame(new StackFrameARM());
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for (int i = 0; register_names[i]; i++) {
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CFIFrameInfo::RegisterValueMap<u_int32_t>::iterator entry =
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caller_registers.find(register_names[i]);
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if (entry != caller_registers.end()) {
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// We recovered the value of this register; fill the context with the
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// value from caller_registers.
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frame->context_validity |= StackFrameARM::RegisterValidFlag(i);
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frame->context.iregs[i] = entry->second;
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} else if (4 <= i && i <= 11 && (last_frame->context_validity &
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StackFrameARM::RegisterValidFlag(i))) {
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// If the STACK CFI data doesn't mention some callee-saves register, and
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// it is valid in the callee, assume the callee has not yet changed it.
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// Registers r4 through r11 are callee-saves, according to the Procedure
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// Call Standard for the ARM Architecture, which the Linux ABI follows.
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frame->context_validity |= StackFrameARM::RegisterValidFlag(i);
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frame->context.iregs[i] = last_frame->context.iregs[i];
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}
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}
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// If the CFI doesn't recover the PC explicitly, then use .ra.
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if (! (frame->context_validity & StackFrameARM::CONTEXT_VALID_PC)) {
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CFIFrameInfo::RegisterValueMap<u_int32_t>::iterator entry =
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caller_registers.find(".ra");
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if (entry != caller_registers.end()) {
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frame->context_validity |= StackFrameARM::CONTEXT_VALID_PC;
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frame->context.iregs[MD_CONTEXT_ARM_REG_PC] = entry->second;
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}
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}
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// If the CFI doesn't recover the SP explicitly, then use .cfa.
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if (! (frame->context_validity & StackFrameARM::CONTEXT_VALID_SP)) {
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CFIFrameInfo::RegisterValueMap<u_int32_t>::iterator entry =
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caller_registers.find(".cfa");
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if (entry != caller_registers.end()) {
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frame->context_validity |= StackFrameARM::CONTEXT_VALID_SP;
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frame->context.iregs[MD_CONTEXT_ARM_REG_SP] = entry->second;
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}
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}
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// If we didn't recover the PC and the SP, then the frame isn't very useful.
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static const int essentials = (StackFrameARM::CONTEXT_VALID_SP
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| StackFrameARM::CONTEXT_VALID_PC);
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if ((frame->context_validity & essentials) != essentials)
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return NULL;
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// An instruction address of zero marks the end of the stack.
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if (frame->context.iregs[MD_CONTEXT_ARM_REG_PC] == 0)
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return NULL;
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// If the new stack pointer is at a lower address than the old, then
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// that's clearly incorrect. Treat this as end-of-stack to enforce
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// progress and avoid infinite loops.
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if (frame->context.iregs[MD_CONTEXT_ARM_REG_SP]
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< last_frame->context.iregs[MD_CONTEXT_ARM_REG_SP])
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return NULL;
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// The new frame's context's PC is the return address, which is one
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// instruction past the instruction that caused us to arrive at the
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// callee. Set new_frame->instruction to one less than the PC. This won't
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// reference the beginning of the call instruction, but it's at least
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// within it, which is sufficient to get the source line information to
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// match up with the line that contains the function call. Callers that
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// require the exact return address value may access
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// frame->context.iregs[MD_CONTEXT_ARM_REG_PC].
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frame->instruction = frame->context.iregs[MD_CONTEXT_ARM_REG_PC] - 1;
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frame->trust = StackFrame::FRAME_TRUST_CFI;
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return frame.release();
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}
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} // namespace google_breakpad
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