140 lines
3.5 KiB
C
140 lines
3.5 KiB
C
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/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* Useful ptrace() utility functions. */
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#ifndef _CORKSCREW_PTRACE_H
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#define _CORKSCREW_PTRACE_H
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#include <corkscrew/map_info.h>
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#include <corkscrew/symbol_table.h>
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#include <sys/types.h>
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#include <stdbool.h>
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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/* Stores information about a process that is used for several different
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* ptrace() based operations. */
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typedef struct
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{
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map_info_t* map_info_list;
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} ptrace_context_t;
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/* Describes how to access memory from a process. */
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typedef struct
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{
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pid_t tid;
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const map_info_t* map_info_list;
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} memory_t;
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#if __i386__
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/* ptrace() register context. */
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typedef struct pt_regs_x86
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{
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uint32_t ebx;
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uint32_t ecx;
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uint32_t edx;
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uint32_t esi;
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uint32_t edi;
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uint32_t ebp;
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uint32_t eax;
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uint32_t xds;
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uint32_t xes;
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uint32_t xfs;
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uint32_t xgs;
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uint32_t orig_eax;
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uint32_t eip;
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uint32_t xcs;
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uint32_t eflags;
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uint32_t esp;
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uint32_t xss;
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} pt_regs_x86_t;
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#endif
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#if __mips__
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/* ptrace() GET_REGS context. */
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typedef struct pt_regs_mips
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{
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uint64_t regs[32];
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uint64_t lo;
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uint64_t hi;
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uint64_t cp0_epc;
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uint64_t cp0_badvaddr;
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uint64_t cp0_status;
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uint64_t cp0_cause;
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} pt_regs_mips_t;
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#endif
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/*
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* Initializes a memory structure for accessing memory from this process.
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*/
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void init_memory(memory_t* memory, const map_info_t* map_info_list);
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/*
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* Initializes a memory structure for accessing memory from another process
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* using ptrace().
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*/
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void init_memory_ptrace(memory_t* memory, pid_t tid);
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/*
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* Reads a word of memory safely.
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* If the memory is local, ensures that the address is readable before dereferencing it.
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* Returns false and a value of 0xffffffff if the word could not be read.
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*/
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bool try_get_word(const memory_t* memory, uintptr_t ptr, uint32_t* out_value);
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/*
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* Reads a word of memory safely using ptrace().
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* Returns false and a value of 0xffffffff if the word could not be read.
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*/
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bool try_get_word_ptrace(pid_t tid, uintptr_t ptr, uint32_t* out_value);
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/*
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* Loads information needed for examining a remote process using ptrace().
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* The caller must already have successfully attached to the process
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* using ptrace().
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*
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* The context can be used for any threads belonging to that process
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* assuming ptrace() is attached to them before performing the actual
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* unwinding. The context can continue to be used to decode backtraces
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* even after ptrace() has been detached from the process.
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*/
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ptrace_context_t* load_ptrace_context(pid_t pid);
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/*
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* Frees a ptrace context.
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*/
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void free_ptrace_context(ptrace_context_t* context);
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/*
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* Finds a symbol using ptrace.
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* Returns the containing map and information about the symbol, or
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* NULL if one or the other is not available.
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*/
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void find_symbol_ptrace(const ptrace_context_t* context, uintptr_t addr,
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const map_info_t** out_map_info, const symbol_t** out_symbol);
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#ifdef __cplusplus
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}
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#endif
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#endif // _CORKSCREW_PTRACE_H
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