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Diffstat (limited to 'src/processor/stackwalker_sparc.cc')
| -rw-r--r-- | src/processor/stackwalker_sparc.cc | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/src/processor/stackwalker_sparc.cc b/src/processor/stackwalker_sparc.cc new file mode 100644 index 00000000..b7b6f005 --- /dev/null +++ b/src/processor/stackwalker_sparc.cc @@ -0,0 +1,139 @@ +// Copyright (c) 2007, 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->instruction = frame->context.pc; + + return frame; +} + + +StackFrame* StackwalkerSPARC::GetCallerFrame( + const CallStack *stack, + const vector< linked_ptr<StackFrameInfo> > &stack_frame_info) { + 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_int32_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; + + return frame; +} + + +} // namespace google_breakpad |