/thirdparty/breakpad/processor/stackwalker_sparc.cc
http://github.com/tomahawk-player/tomahawk · C++ · 139 lines · 61 code · 24 blank · 54 comment · 9 complexity · 027c9ae2f34fe2f1689b6748cd4e6804 MD5 · raw file
- // 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 "processor/logging.h"
- #include "processor/stackwalker_sparc.h"
- namespace google_breakpad {
- StackwalkerSPARC::StackwalkerSPARC(const SystemInfo *system_info,
- const MDRawContextSPARC *context,
- MemoryRegion *memory,
- const CodeModules *modules,
- SymbolSupplier *supplier,
- SourceLineResolverInterface *resolver)
- : Stackwalker(system_info, memory, modules, supplier, resolver),
- context_(context) {
- }
- StackFrame* StackwalkerSPARC::GetContextFrame() {
- if (!context_ || !memory_) {
- BPLOG(ERROR) << "Can't get context frame without context or memory";
- 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) {
- 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.
- u_int64_t stack_pointer = last_frame->context.g_r[30];
- if (stack_pointer <= last_frame->context.g_r[14]) {
- return NULL;
- }
- u_int32_t instruction;
- if (!memory_->GetMemoryAtAddress(stack_pointer + 60,
- &instruction) || instruction <= 1) {
- return NULL;
- }
- u_int32_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