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/* ----------------------------------------------------------------------------
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* Copyright (c) Huawei Technologies Co., Ltd. 2020-2020. All rights reserved.
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* Description: Stack Info Implementation
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* Author: Huawei LiteOS Team
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* Create: 2020-10-22
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific prior written
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* permission.
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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 LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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* --------------------------------------------------------------------------- */
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/*
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这段文件是针对LiteOS操作系统中的Shell命令编写的，
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主要实现了内核异常处理机制中与堆栈相关的功能，包括堆栈信息的获取和检查。
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*/
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#include "securec.h"
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#include "los_config.h"
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#include "los_stackinfo_pri.h"
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#include "los_printf_pri.h"
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#ifdef LOSCFG_SHELL
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#include "shcmd.h"
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#include "shell.h"
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#endif
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//这个函数用于检查堆栈是否溢出
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VOID OsExcStackCheck(VOID)
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{
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UINT32 index;
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UINT32 cpuid;
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UINTPTR *stackTop = NULL;
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const StackInfo *stackInfo = NULL;
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UINT32 stackNum;
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//获取堆栈信息，如果堆栈信息错误，直接返回
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OsGetStackInfo(&stackInfo, &stackNum);
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if ((stackInfo == NULL) || (stackNum == 0)) {
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return;
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}
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//从头开始，遍历所有的堆栈
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for (index = 0; index < stackNum; index++) {
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for (cpuid = 0; cpuid < LOSCFG_KERNEL_CORE_NUM; cpuid++) {
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//堆栈的栈顶
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stackTop = (UINTPTR *)((UINTPTR)stackInfo[index].stackTop + cpuid * stackInfo[index].stackSize);
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//检查栈顶信息是否被篡改，如果被篡改输出该堆栈溢出的信息
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if (*stackTop != OS_STACK_MAGIC_WORD) {
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PRINT_ERR("cpu:%u %s overflow , magic word changed to 0x%x\n",
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LOSCFG_KERNEL_CORE_NUM - 1 - cpuid, stackInfo[index].stackName, *stackTop);
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}
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}
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}
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}
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//这个函数用于获取并打印所有的堆栈信息
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VOID OsExcStackInfo(VOID)
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{
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UINT32 index;
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UINT32 cpuid;
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UINT32 size;
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UINTPTR *stackTop = NULL;
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UINTPTR *stack = NULL;
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const StackInfo *stackInfo = NULL;
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UINT32 stackNum;
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//获取堆栈信息，如果堆栈信息错误，直接返回
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OsGetStackInfo(&stackInfo, &stackNum);
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if ((stackInfo == NULL) || (stackNum == 0)) {
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return;
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}
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//输出堆栈名、CPU ID、堆栈的地址、堆栈的总大小，堆栈已使用的大小
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PrintExcInfo("\n stack name cpu id stack addr total size used size\n"
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" ---------- ------ --------- -------- --------\n");
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//从头开始，遍历所有的堆栈
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for (index = 0; index < stackNum; index++) {
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for (cpuid = 0; cpuid < LOSCFG_KERNEL_CORE_NUM; cpuid++) {
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//获取堆栈的栈顶
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stackTop = (UINTPTR *)((UINTPTR)stackInfo[index].stackTop + cpuid * stackInfo[index].stackSize);
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stack = (UINTPTR *)((UINTPTR)stackTop + stackInfo[index].stackSize);
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//调用OsStackWaterLineGet函数计算堆栈已使用的大小
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(VOID)OsStackWaterLineGet(stack, stackTop, &size);
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//输出各类信息
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PrintExcInfo("%11s %-5d %-10p 0x%-8x 0x%-4x\n", stackInfo[index].stackName,
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LOSCFG_KERNEL_CORE_NUM - 1 - cpuid, stackTop, stackInfo[index].stackSize, size);
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}
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}
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//进行堆栈溢出检查
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OsExcStackCheck();
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}
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//注册Shell命令stack，调用OsExcStackInfo函数获取并打印所有堆栈信息至控制台。
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#ifdef LOSCFG_SHELL
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SHELLCMD_ENTRY(stack_shellcmd, CMD_TYPE_EX, "stack", 1, (CmdCallBackFunc)OsExcStackInfo);
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#endif
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