Undefined instruction 问题

chenmengzhong 2008-3-26 11:56 楼主

调用select函数时出现如下错误

Undefined instruction
Exception address: 0x0005c1e0
Current Processor Status Register: 0x20000013
Task: 0xff45c8 "tTffsPTask"

哪位大侠指点一下！谢谢！

回复评论（15）

沙发 wenf

确定是执行到select那一句挂掉的吗？
设断点跟一下~
代码贴点出来吧

点赞 2008-3-26 22:03

确定！
代码如下
static STATUS RecvDataWithTimeOut(UINT16 datacount,UINT16 timeoutvalue)
{
UINT16 bytesRead;
UINT32 i = 0;
struct timeval timeout;
int selectnum;
struct fd_set readFds; /* 串口bit mask of fds to read from */
      int width;             /* number of fds on which to pend */

timeout.tv_sec = timeoutvalue;
timeout.tv_usec = 0;FD_ZERO (&readFds);

FD_ZERO (&readFds);
FD_SET (comm2Fd, &readFds);
width = comm2Fd + 1;
FD_ISSET (comm2Fd, &readFds);

FOREVER
{
            printf("select start!!!\n");
if(timeoutvalue==0)
selectnum = select (width, &readFds, NULL, NULL, NULL);
            printf("select over!!!\n");
else
selectnum = select (width, &readFds, NULL, NULL, &timeout);

if (selectnum == ERROR)
{
#ifdef DEBUG_PRINT
printErr("ERROR:An select error has occurred in received data from COM2!\n");
#endif
return ERROR;
}
else if(selectnum == 0)
{
#ifdef DEBUG_PRINT
printErr("ERROR:An timeout error has occurred in received data from COM2!\n");
#endif
return ERROR;
}

if (FD_ISSET (comm2Fd, &readFds))
{
bytesRead = fioRead(comm2Fd,szBuf,datacount);

/*#ifdef DEBUG_PRINT
printf("bytesRead = %d, datacount = %d, szBuf[0] = %x\n",bytesRead,datacount,szBuf[0]);
#endif*/

return bytesRead;
}
}

}

现在 select start!!!能打印出来
select over!!!打印不出来就死了！！
大侠，判断以下

点赞 2008-3-31 16:51

5楼 hone

..\temp.c: In function `RecvDataWithTimeOut':
..\temp.c:75: `comm2Fd' undeclared (first use in this function)
..\temp.c:75: (Each undeclared identifier is reported only once
..\temp.c:75: for each function it appears in.)
..\temp.c:85: parse error before `else'
..\temp.c:105: `szBuf' undeclared (first use in this function)

点赞 2008-3-31 22:30

6楼 661023

这段代码能编译通过？

if(timeoutvalue==0)
selectnum = select (width, &readFds, NULL, NULL, NULL);
printf("select over!!!\n");
else
selectnum = select (width, &readFds, NULL, NULL, &timeout);

点赞 2008-3-31 22:34

7楼 amork2007

不好意思，昨天着急打错了，但是跟踪加的位置是没错的，请各位大侠原谅，
代码如下
static STATUS RecvDataWithTimeOut(UINT16 datacount,UINT16 timeoutvalue)
{
UINT16 bytesRead;
UINT32 i = 0;
struct timeval timeout;
int selectnum;
struct fd_set readFds; /* 串口bit mask of fds to read from */
      int width;          /* number of fds on which to pend */

timeout.tv_sec = timeoutvalue;
timeout.tv_usec = 0;FD_ZERO (&readFds);

FD_ZERO (&readFds);
FD_SET (comm2Fd, &readFds);
width = comm2Fd + 1;
FD_ISSET (comm2Fd, &readFds);

FOREVER
{
printf("select start!!!\n");
if(timeoutvalue==0)
{
selectnum = select (width, &readFds, NULL, NULL, NULL);
printf("select over!!!\n");
}
else
selectnum = select (width, &readFds, NULL, NULL, &timeout);

if (selectnum == ERROR)
{
#ifdef DEBUG_PRINT
printErr("ERROR:An select error has occurred in received data from COM2!\n");
#endif
return ERROR;
}
else if(selectnum == 0)
{
#ifdef DEBUG_PRINT
printErr("ERROR:An timeout error has occurred in received data from COM2!\n");
#endif
return ERROR;
}

if (FD_ISSET (comm2Fd, &readFds))
{
bytesRead = fioRead(comm2Fd,szBuf,datacount);

/*#ifdef DEBUG_PRINT
printf("bytesRead = %d, datacount = %d, szBuf[0] = %x\n",bytesRead,datacount,szBuf[0]);
#endif*/

return bytesRead;
}
}

}

现在 select start!!!能打印出来
select over!!!打印不出来就死了！！
大侠，判断以下

点赞 2008-4-1 08:49

8楼 zhangssd

再详细介绍一下，这段代码是ARM通过串口接收单片机信息的代码，整个系统有ABCDE五个用户任务，其中ABC任务同一个优先级，DE任务同一个优先级但比ABC任务优先级低，这段代码为A任务调用，B与DE属于死循环任务，整个任务调度依靠VXWORKS默认任务调度机制，可是现在发现，该系统会发生不可预期的死机现象，表现有时是低优先级任务DE挂起，有时甚至连0优先级的异常处理任务以及FLASH驱动任务都挂起了，加跟踪后几乎每次都是死机在执行printf("select start!!!\n");之后，printf("select over!!!\n"); 执行不出来，并且有时会出现如下错误：

Undefined instruction
Exception address: 0x0005c1e0
Current Processor Status Register: 0x20000013
Task: 0xff45c8 "tTffsPTask"

我的问题是，我的这段代码是否正确？能否判定是调用select函数的问题？select函数是否有什么需要注意的地方？

我现在把BCDE任务全部砍掉，只留A任务在跑，这时A任务会有定期的（大概一分钟一次的）由单片机主动访问ARM，由ARM执行IIC驱动得到其他芯片数据，并返回给单片机的动作。可是这样依然会发生不定期的死机。单片机的型号是W78E516B会有什么问题吗？ARM的型号是三星S3C4510B01-QERO,这款ARM的IIC是否有问题？

点赞 2008-4-1 09:41

9楼 nibian

comm2Fd这个值没有问题的话，这段代码应该没有问题。
应该是其他的问题

点赞 2008-4-1 20:56

10楼 rqq2007

谢谢！怎么验证comm2Fd这个值呢？另外能帮我看看下面这段代码是否有时序问题吗？谢谢！
void usrRoot (char *pMemPoolStart, unsigned memPoolSize)
{
usrKernelCoreInit ();             /* core kernel facilities */
memPartLibInit (pMemPoolStart, memPoolSize); /* core memory partition manager */
memInit (pMemPoolStart, memPoolSize); /* full featured memory allocator */
sysClkInit ();                   /* System clock component */
usrIosCoreInit ();                /* core I/O system */
usrKernelExtraInit ();             /* extended kernel facilities */
usrIosExtraInit ();                /* extended I/O system */
selectInit ();                   /* select */
usrToolsInit ();                   /* software development tools */
cplusLibInit ();                   /* C++ runtime support */
usrAppInit ();                   /* call usrAppInit() (in your usrAppInit.c project file) after startup. */
}

我看网上有些例子selectInit ();是这样写的selectInit (NUM_FILES);,有什么含义？和我现在的有什么不同吗？
我很菜，帮帮忙！

点赞 2008-4-1 21:38