los_exc_pri.h 文件参考

浏览源代码.

结构体
struct	IpInfo

函数
UINT32	OsGetSystemStatus (VOID)
	获取系统状态 更多...
VOID	BackTraceSub (UINTPTR regFP)
VOID	OsExcInit (VOID)
	异常接管模块的初始化 更多...
BOOL	OsSystemExcIsReset (VOID)
UINT32	BackTraceGet (UINTPTR regFP, IpInfo *callChain, UINT32 maxDepth)
BOOL	OsGetUsrIpInfo (UINTPTR ip, IpInfo *info)

函数说明

BackTraceGet()

UINT32 BackTraceGet	(	UINTPTR	regFP,
		IpInfo *	callChain,
		UINT32	maxDepth
	)

在文件 los_exc.c 第 850 行定义.

{
    UINTPTR tmpFP, backLR;
    UINTPTR stackStart, stackEnd;
    UINTPTR backFP = regFP;
    UINT32 count = 0;
    BOOL ret;
    VADDR_T kvaddr;
 
    if (FindSuitableStack(regFP, &stackStart, &stackEnd, &kvaddr) == FALSE) {
        if (callChain == NULL) {
            PrintExcInfo("traceback error fp = 0x%x\n", regFP);
        }
        return 0;
    }
 
    /*
     * Check whether it is the leaf function.
     * Generally, the frame pointer points to the address of link register, while in the leaf function,
     * there's no function call, and compiler will not store the link register, but the frame pointer
     * will still be stored and updated. In that case we needs to find the right position of frame pointer.
     */
    tmpFP = *(UINTPTR *)(UINTPTR)kvaddr;
    if (IsValidFP(tmpFP, stackStart, stackEnd, NULL) == TRUE) {
        backFP = tmpFP;
        if (callChain == NULL) {
            PrintExcInfo("traceback fp fixed, trace using   fp = 0x%x\n", backFP);
        }
    }
 
    while (IsValidFP(backFP, stackStart, stackEnd, &kvaddr) == TRUE) {
        tmpFP = backFP;
#ifdef LOSCFG_COMPILER_CLANG_LLVM
        backFP = *(UINTPTR *)(UINTPTR)kvaddr;
        if (IsValidFP(tmpFP + POINTER_SIZE, stackStart, stackEnd, &kvaddr) == FALSE) {
            if (callChain == NULL) {
                PrintExcInfo("traceback backLR check failed, backLP: 0x%x\n", tmpFP + POINTER_SIZE);
            }
            return 0;
        }
        backLR = *(UINTPTR *)(UINTPTR)kvaddr;
#else
        backLR = *(UINTPTR *)(UINTPTR)kvaddr;
        if (IsValidFP(tmpFP - POINTER_SIZE, stackStart, stackEnd, &kvaddr) == FALSE) {
            if (callChain == NULL) {
                PrintExcInfo("traceback backFP check failed, backFP: 0x%x\n", tmpFP - POINTER_SIZE);
            }
            return 0;
        }
        backFP = *(UINTPTR *)(UINTPTR)kvaddr;
#endif
        IpInfo info = {0};
        ret = OsGetUsrIpInfo((VADDR_T)backLR, &info);
        if (callChain == NULL) {
            PrintExcInfo("traceback %u -- lr = 0x%x    fp = 0x%x ", count, backLR, backFP);
            if (ret) {
#ifdef LOSCFG_KERNEL_VM
                PrintExcInfo("lr in %s --> 0x%x\n", info.f_path, info.ip);
#else
                PrintExcInfo("\n");
#endif
            } else {
                PrintExcInfo("\n");
            }
        } else {
            (VOID)memcpy_s(&callChain[count], sizeof(IpInfo), &info, sizeof(IpInfo));
        }
        count++;
        if ((count == maxDepth) || (backFP == tmpFP)) {
            break;
        }
    }
    return count;
}

函数调用图:

这是这个函数的调用关系图:

BackTraceSub()

VOID BackTraceSub

(

UINTPTR

regFP

)

在文件 los_exc.c 第 925 行定义.

{
    (VOID) BackTraceGet(regFP, NULL, OS_MAX_BACKTRACE);
}

函数调用图:

这是这个函数的调用关系图:

OsExcInit()

VOID OsExcInit

(

VOID

)

异常接管模块的初始化

在文件 los_exc.c 第 937 行定义.

{
    OsExcStackInfoReg(g_excStack, sizeof(g_excStack) / sizeof(g_excStack[0])); //异常模式下注册内核栈信息
}

函数调用图:

这是这个函数的调用关系图:

OsGetSystemStatus()

UINT32 OsGetSystemStatus

(

VOID

)

获取系统状态

在文件 los_exc.c 第 181 行定义.

{
    UINT32 flag;
    UINT32 cpuid = g_currHandleExcCpuid; //全局变量 当前执行CPU ID
 
    if (cpuid == INVALID_CPUID) { //当前CPU处于空闲状态的情况
        flag = OS_SYSTEM_NORMAL;
    } else if (cpuid == ArchCurrCpuid()) { //碰到了正在执行此处代码的CPU core
        flag = OS_SYSTEM_EXC_CURR_CPU; //当前CPU
    } else {
        flag = OS_SYSTEM_EXC_OTHER_CPU; //其他CPU
    }
 
    return flag;
}

函数调用图:

这是这个函数的调用关系图:

OsGetUsrIpInfo()

BOOL OsGetUsrIpInfo	(	UINTPTR	ip,
		IpInfo *	info
	)

在文件 los_exc.c 第 804 行定义.

{
    if (info == NULL) {
        return FALSE;
    }
#ifdef LOSCFG_KERNEL_VM
    BOOL ret = FALSE;
    const CHAR *name = NULL;
    LosVmMapRegion *region = NULL;
    LosProcessCB *runProcess = OsCurrProcessGet();
 
    if (LOS_IsUserAddress((VADDR_T)ip) == FALSE) {
        info->ip = ip;
        name = "kernel";
        ret = FALSE;
        goto END;
    }
 
    region = LOS_RegionFind(runProcess->vmSpace, (VADDR_T)ip);
    if (region == NULL) {
        info->ip = ip;
        name = "invalid";
        ret = FALSE;
        goto END;
    }
 
    info->ip = ip - OsGetTextRegionBase(region, runProcess);
    name = OsGetRegionNameOrFilePath(region);
    ret = TRUE;
    if (strcmp(name, "/lib/libc.so") != 0) {
        PRINT_ERR("ip = 0x%x, %s\n", info->ip, name);
    }
END:
    info->len = strlen(name);
    if (strncpy_s(info->f_path, REGION_PATH_MAX, name, REGION_PATH_MAX - 1) != EOK) {
        info->f_path[0] = '\0';
        info->len = 0;
        PRINT_ERR("copy f_path failed, %s\n", name);
    }
    return ret;
#else
    info->ip = ip;
    return FALSE;
#endif
}

函数调用图:

这是这个函数的调用关系图:

OsSystemExcIsReset()

BOOL OsSystemExcIsReset

(

VOID

)

在文件 panic_shellcmd.c 第 43 行定义.

{
    return systemExcReset;
}

这是这个函数的调用关系图: