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6d3a825dbf
Add a CFIFrameInfo class (named for symmetry with WindowsFrameInfo) to represent the set of STACK CFI rules in effect at a given instruction, and apply them to a set of register values. Provide a SimpleCFIWalker class template, to allow the essential CFI code to be shared amongst the different architectures. Teach BasicSourceLineResolver to partially parse 'STACK CFI' records, and produce the set of rules in effect at a given instruction on demand, by combining the initial rule set and the appropriate rule deltas in a CFIFrameInfo object. Adapt StackwalkerX86 and StackFrameX86 to retrieve, store, and apply CFI stack walking information. Add validity flags for all the general-purpose registers to StackFrameX86::ContextValidity. a=jimblandy, r=mmentovai git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@549 4c0a9323-5329-0410-9bdc-e9ce6186880e
128 lines
5.2 KiB
C++
128 lines
5.2 KiB
C++
// -*- mode: c++ -*-
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// 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_x86.h: x86-specific stackwalker.
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//
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// Provides stack frames given x86 register context and a memory region
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// corresponding to an x86 stack.
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//
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// Author: Mark Mentovai
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#ifndef PROCESSOR_STACKWALKER_X86_H__
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#define PROCESSOR_STACKWALKER_X86_H__
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#include "google_breakpad/common/breakpad_types.h"
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#include "google_breakpad/common/minidump_format.h"
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#include "google_breakpad/processor/stackwalker.h"
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#include "google_breakpad/processor/stack_frame_cpu.h"
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#include "src/processor/cfi_frame_info.h"
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namespace google_breakpad {
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class CodeModules;
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class StackwalkerX86 : public Stackwalker {
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public:
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// context is an x86 context object that gives access to x86-specific
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// register state corresponding to the innermost called frame to be
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// included in the stack. The other arguments are passed directly through
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// to the base Stackwalker constructor.
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StackwalkerX86(const SystemInfo *system_info,
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const MDRawContextX86 *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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private:
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// A STACK CFI-driven frame walker for the X86.
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typedef SimpleCFIWalker<u_int32_t, MDRawContextX86> CFIWalker;
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// Implementation of Stackwalker, using x86 context (%ebp, %esp, %eip) and
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// stack conventions (saved %ebp at [%ebp], saved %eip at 4[%ebp], or
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// alternate conventions as guided by any WindowsFrameInfo available for the
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// code in question.).
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virtual StackFrame *GetContextFrame();
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virtual StackFrame *GetCallerFrame(const CallStack *stack);
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// Use windows_frame_info (derived from STACK WIN and FUNC records)
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// to construct the frame that called frames.back(). The caller
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// takes ownership of the returned frame. Return NULL on failure.
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StackFrameX86 *GetCallerByWindowsFrameInfo(
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const vector<StackFrame*> &frames,
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WindowsFrameInfo *windows_frame_info);
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// Use cfi_frame_info (derived from STACK CFI records) to construct
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// the frame that called frames.back(). The caller takes ownership
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// of the returned frame. Return NULL on failure.
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StackFrameX86 *GetCallerByCFIFrameInfo(const vector<StackFrame*> &frames,
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CFIFrameInfo *cfi_frame_info);
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// Assuming a traditional frame layout --- where the caller's %ebp
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// has been pushed just after the return address and the callee's
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// %ebp points to the saved %ebp --- construct the frame that called
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// frames.back(). The caller takes ownership of the returned frame.
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// Return NULL on failure.
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StackFrameX86 *GetCallerByEBPAtBase(const vector<StackFrame*> &frames);
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// Scan the stack starting at location_start, looking for an address
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// that looks like a valid instruction pointer. Addresses must
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// 1) be contained in the current stack memory
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// 2) pass the checks in Stackwalker::InstructionAddressSeemsValid
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//
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// Returns true if a valid-looking instruction pointer was found.
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// When returning true, sets location_found to the address at which
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// the value was found, and eip_found to the value contained at that
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// location in memory.
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bool ScanForReturnAddress(u_int32_t location_start,
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u_int32_t *location_found,
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u_int32_t *eip_found);
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// Stores the CPU context corresponding to the innermost stack frame to
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// be returned by GetContextFrame.
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const MDRawContextX86 *context_;
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// Our register map, for cfi_walker_.
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static const CFIWalker::RegisterSet cfi_register_map_[];
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// Our CFI frame walker.
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const CFIWalker cfi_walker_;
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};
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} // namespace google_breakpad
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#endif // PROCESSOR_STACKWALKER_X86_H__
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