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9bd60ea2d4
--HG-- extra : rebase_source : bd427749667ddd6641eff414879c3706a5cb5f5e
234 lines
8.1 KiB
C++
234 lines
8.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* libunwind - a platform-independent unwind library
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Copyright 2011 Linaro Limited
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This file is part of libunwind.
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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// Copyright (c) 2010, 2011 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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// Derived from libunwind, with extensive modifications.
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// This file is derived from the following files in
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// toolkit/crashreporter/google-breakpad:
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// src/common/arm_ex_to_module.h
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// src/common/memory_range.h
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// src/common/arm_ex_reader.h
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#ifndef LulExidxExt_h
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#define LulExidxExt_h
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#include "LulMainInt.h"
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using lul::LExpr;
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using lul::RuleSet;
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using lul::SecMap;
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namespace lul {
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typedef enum extab_cmd {
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ARM_EXIDX_CMD_FINISH,
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ARM_EXIDX_CMD_SUB_FROM_VSP,
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ARM_EXIDX_CMD_ADD_TO_VSP,
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ARM_EXIDX_CMD_REG_POP,
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ARM_EXIDX_CMD_REG_TO_SP,
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ARM_EXIDX_CMD_VFP_POP,
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ARM_EXIDX_CMD_WREG_POP,
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ARM_EXIDX_CMD_WCGR_POP,
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ARM_EXIDX_CMD_RESERVED,
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ARM_EXIDX_CMD_REFUSED,
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} extab_cmd_t;
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struct exidx_entry {
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uint32_t addr;
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uint32_t data;
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};
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struct extab_data {
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extab_cmd_t cmd;
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uint32_t data;
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};
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enum extab_cmd_flags {
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ARM_EXIDX_VFP_SHIFT_16 = 1 << 16,
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ARM_EXIDX_VFP_FSTMD = 1 << 17, // distinguishes FSTMxxD from FSTMxxX
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};
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// Receives information from arm_ex_reader::ExceptionTableInfo
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// and adds it to the SecMap object
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// This is in effect the EXIDX summariser.
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class ARMExToModule {
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public:
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ARMExToModule(SecMap* smap, void(*log)(const char*)) : smap_(smap)
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, log_(log) { }
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~ARMExToModule() { }
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void AddStackFrame(uintptr_t addr, size_t size);
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int ImproveStackFrame(const struct extab_data* edata);
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void DeleteStackFrame();
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void SubmitStackFrame();
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private:
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SecMap* smap_;
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LExpr vsp_; // Always appears to be of the form "sp + offset"
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RuleSet curr_rules_; // Also holds the address range being summarised
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// debugging message sink
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void (*log_)(const char*);
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int TranslateCmd(const struct extab_data* edata, LExpr& vsp);
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};
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// (derived from)
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// memory_range.h: Define the google_breakpad::MemoryRange class, which
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// is a lightweight wrapper with a pointer and a length to encapsulate
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// a contiguous range of memory.
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// A lightweight wrapper with a pointer and a length to encapsulate a
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// contiguous range of memory. It provides helper methods for checked
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// access of a subrange of the memory. Its implemementation does not
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// allocate memory or call into libc functions, and is thus safer to use
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// in a crashed environment.
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class MemoryRange {
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public:
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MemoryRange(const void* data, size_t length) {
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Set(data, length);
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}
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// Sets this memory range to point to |data| and its length to |length|.
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void Set(const void* data, size_t length) {
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data_ = reinterpret_cast<const uint8_t*>(data);
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// Always set |length_| to zero if |data_| is NULL.
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length_ = data ? length : 0;
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}
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// Returns true if this range covers a subrange of |sub_length| bytes
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// at |sub_offset| bytes of this memory range, or false otherwise.
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bool Covers(size_t sub_offset, size_t sub_length) const {
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// The following checks verify that:
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// 1. sub_offset is within [ 0 .. length_ - 1 ]
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// 2. sub_offset + sub_length is within
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// [ sub_offset .. length_ ]
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return sub_offset < length_ &&
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sub_offset + sub_length >= sub_offset &&
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sub_offset + sub_length <= length_;
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}
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// Returns a pointer to the beginning of this memory range.
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const uint8_t* data() const { return data_; }
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// Returns the length, in bytes, of this memory range.
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size_t length() const { return length_; }
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private:
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// Pointer to the beginning of this memory range.
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const uint8_t* data_;
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// Length, in bytes, of this memory range.
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size_t length_;
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};
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// This class is a reader for ARM unwind information
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// from .ARM.exidx and .ARM.extab sections.
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class ExceptionTableInfo {
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public:
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ExceptionTableInfo(const char* exidx, size_t exidx_size,
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const char* extab, size_t extab_size,
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uint32_t text_last_svma,
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lul::ARMExToModule* handler,
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const char* mapping_addr,
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uint32_t loading_addr,
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uintptr_t text_bias,
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void (*log)(const char*))
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: mr_exidx_(lul::MemoryRange(exidx, exidx_size)),
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mr_extab_(lul::MemoryRange(extab, extab_size)),
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text_last_svma_(text_last_svma),
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handler_(handler), mapping_addr_(mapping_addr),
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loading_addr_(loading_addr),
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text_bias_(text_bias),
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log_(log) { }
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~ExceptionTableInfo() { }
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// Parses the entries in .ARM.exidx and possibly
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// in .ARM.extab tables, reports what we find to
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// arm_ex_to_module::ARMExToModule.
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void Start();
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private:
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lul::MemoryRange mr_exidx_;
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lul::MemoryRange mr_extab_;
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uint32_t text_last_svma_;
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lul::ARMExToModule* handler_;
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const char* mapping_addr_;
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uint32_t loading_addr_;
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uintptr_t text_bias_;
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// debugging message sink
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void (*log_)(const char*);
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enum ExExtractResult {
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ExSuccess, // success
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ExInBufOverflow, // out-of-range while reading .exidx
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ExOutBufOverflow, // output buffer is too small
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ExCantUnwind, // this function is marked CANT_UNWIND
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ExCantRepresent, // entry valid, but we can't represent it
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ExInvalid // entry is invalid
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};
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ExExtractResult
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ExtabEntryExtract(const struct lul::exidx_entry* entry,
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uint8_t* buf, size_t buf_size,
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/*OUT*/size_t* buf_used);
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int ExtabEntryDecode(const uint8_t* buf, size_t buf_size);
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};
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} // namespace lul
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#endif // LulExidxExt_h
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