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当它尝试访问结构数据时,我在几个函数中出现运行时错误,通常作为参数传递给函数。

问题的第一个例子是:

signed portBASE_TYPE xQueueGenericReceive( xQueueHandle pxQueue, void * const p\

vBuffer, portTickType xTicksToWait, portBASE_TYPE xJustPeeking )

{

..............



if( pxQueue->uxMessagesWaiting > ( unsigned portBASE_TY\

PE ) 0 )



.......................



}

其中 pxQueue 是一个结构:

typedef xQUEUE * xQueueHandle;

和:

typedef struct QueueDefinition

{

        signed char *pcHead;                            /*< Points to the begin\

ning of the queue storage area. */

    signed char *pcTail;                            /*< Points to the byte \

at the end of the queue storage area.  Once more byte is allocated than necessa\

ry to store the queue items, this is used as a marker. */



        signed char *pcWriteTo;                         /*< Points to the free \

next place in the storage area. */

        signed char *pcReadFrom;  
                    /*< Points to the last \

place that a queued item was read from. */


        xList xTasksWaitingToSend;                              /*< List of tas\

ks that are blocked waiting to post onto this queue.  Stored in priority order.\

*/
        xList xTasksWaitingToReceive;                   /*< List of tasks that \

are blocked waiting to read from this queue.  Stored in priority order. */


        volatile unsigned portBASE_TYPE uxMessagesWaiting;/*< The number of ite\

ms currently in the queue. */
        unsigned portBASE_TYPE uxLength;                /*< The length of the q\

ueue defined as the number of items it will hold, not the number of bytes. */
        unsigned portBASE_TYPE uxItemSize;              /*< The size of each it\

ems that the queue will hold. */


        signed portBASE_TYPE xRxLock;                   /*< Stores the number o\

f items received from the queue (removed from the queue) while the queue was lo\

cked.  Set to queueUNLOCKED when the queue is not locked. */
        signed portBASE_TYPE xTxLock;                   /*< Stores the number o\

f items transmitted to the queue (added to the queue)

while the queue was locke\

d.  Set to qu.......................



}

其中 pxQueue 是一个结构:

typedef xQUEUE * xQueueHandle;

和:

typedef struct QueueDefinition

{

        signed char *pcHead;                            /*< Points to the begin\

ning of the queue storage area. */

    signed char *pcTail;                            /*< Points to the byte \

at the end of the queue storage area.  Once more byte is allocated than necessa\

ry to store the queue items, this is used as a marker. */



        signed char *pcWriteTo;                         /*< Points to the free \

next place in the storage area. */

        signed char *pcReadFrom;  
                    /*< Points to the last \

place that a queued item was read from. */


        xList xTasksWaitingToSend;                              /*< List of tas\

ks that are blocked waiting to post onto this queue.  Stored in priority order.\

*/
        xList xTasksWaitingToReceive;                   /*< List of tasks that \

are blocked waiting to read from this queue.  Stored in priority order. */


        volatile unsigned portBASE_TYPE uxMessagesWaiting;/*< The number of ite\

ms currently in the queue. */
        unsigned portBASE_TYPE uxLength;                /*< The length of the q\

ueue defined as the number of items it will hold, not the number of bytes. */
        unsigned portBASE_TYPE uxItemSize;              /*< The size of each it\

ems that the queue will hold. */


        signed portBASE_TYPE xRxLock;                   /*< Stores the number o\

f items received from the queue (removed from the queue) while the queue was lo\

cked.  Set to queueUNLOCKED when the queue is not locked. */
        signed portBASE_TYPE xTxLock;                   /*< Stores the number o\

f items transmitted to the queue (added to the queue)

while the queue was locke\

d.  Set to queueUNLOCKED when the queue is not locked. */



} xQUEUE;
eueUNLOCKED when the queue is not locked. */



} xQUEUE;

运行时错误是:

.....
COREB: start xQueueGenericReceive                                           
COREB: execption 24 addr 3c00384                                            
COREB: coreb dump stack                                                     
COREB: found fp: ff700900                                                   
COREB:  call frame 0 -12 feb055e2                                           
COREB:  call frame 0 -11 00000000                                           
COREB:  call frame 0 -9 00000000                                            
COREB:  call frame 0 -8 ff7008d0    

......

同样,我对以下函数也有同样的问题:

void vListRemove( xListItem *pxItemToRemove )

{

xList * pxList;



   pxItemToRemove->pxNext->pxPrevious = pxItemToRemove->pxPrevious;

        pxItemToRemove->pxPrevious->pxNext = pxItemToRemove->pxNext;

}

其中可以读取 pxItemToRemove->pxPrevious 但不能读取 pxItemToRemove->pxNext->pxPrevious

它的结构是:

struct xLIST_ITEM

{

     portTickType xItemValue;                                /*< The value b\

eing listed.  In most cases this is used to sort the list in descending order. \

*/

        volatile struct xLIST_ITEM * pxNext;    /*< Pointer to the next xListIt\

em in the list. */

        volatile struct xLIST_ITEM * pxPrevious;/*< Pointer to the previous xLi\

stItem in the list. */

        void * pvOwner;                                                 /*< Poi\

nter to the object (normally a TCB) that contains the list item.  There is ther\

efore a two way link between the object containing the list item and the list i\

tem itself. */

        void * pvContainer;                                             /*< Poi\

nter to the list in which this list item is placed (if any). */

};

typedef struct xLIST_ITEM xListItem;            /* For some reason lint wants t\

his as two separate definitions. */

运行时错误是:

COREB: got to vTaskDelete                                                   
COREB: pxTCB GLI prev: a5a5a5a5                                             
COREB: sent to list: 3d02004                                                
COREB: list_rem px prev: a5a5a5a5                                           
COREB: execption 24 addr 3c05444                                            
COREB: coreb dump stack                                                     
COREB: found fp: ff7008fc                                                   
COREB:  call frame 0 -12 feb055e2                                           
COREB:  call frame 0 -11 00000000                                           
COREB:  call frame 0 -9 00000000                                            
COREB:  call frame 0 -8 ff7008cc                                            
COREB:  call frame 0 -7 ff700ff4    

先感谢您。

威廉


使用 gdb 进一步调试我有 pxQueue:

p/x *pxQueue

$9 = {pcHead = 0xadadadad, pcTail = 0xadadadad, pcWriteTo = 0xadadadad,

  pcReadFrom = 0xadadadad, xTasksWaitingToSend = {

    uxNumberOfItems = 0xadadadad, pxIndex = 0xadadadad, xListEnd = {

      xItemValue = 0xadad, pxNext = 0xadadadad, pxPrevious = 0xadadadad}},

  xTasksWaitingToReceive = {uxNumberOfItems = 0xadadadad,

    pxIndex = 0xadadadad, xListEnd = {xItemValue = 0xadad,

      pxNext = 0xadadadad, pxPrevious = 0xadadadad}},

  uxMessagesWaiting = 0xadadadad, uxLength = 0xadadadad,

  uxItemSize = 0xadadadad, xRxLock = 0xadadadad, xTxLock = 0xadadadad}

真的很奇怪,结构的所有参数都有相同的值:0xadadadad

当我进一步调试并将信号量创建视为创建队列函数中的队列对象时,我得到了正常值:

 p *pxNewQueue

$7 = {pcHead = 0x3d17000 "", pcTail = 0x3d17000 "", pcWriteTo = 0x3d17000 "", 

  pcReadFrom = 0x3d17000 "", xTasksWaitingToSend = {uxNumberOfItems = 0, 

    pxIndex = 0x3d16018, xListEnd = {xItemValue = 65535, pxNext = 0x3d16018, 

      pxPrevious = 0x3d16018}}, xTasksWaitingToReceive = {uxNumberOfItems = 0, 

    pxIndex = 0x3d1602c, xListEnd = {xItemValue = 65535, pxNext = 0x3d1602c, 

      pxPrevious = 0x3d1602c}}, uxMessagesWaiting = 0, uxLength = 1, 

  uxItemSize = 0, xRxLock = -1, xTxLock = -1}

谢谢,

威廉

4

2 回答 2

0

我找到了答案,

基本上,因为 FreeRTOS 中没有关于它的文档,所以我使用 gdb 并在任务创建期间查找 pvParameter 并查看它在堆栈中的存储位置。然后当我使用 taskhook 函数触发任务时,我返回参数:

void *param = *(pxCurrentTCB->pxTopOfStack+31);

                //        xTaskCallApplicationTaskHook( pxCurrentTCB, pxCurrent\
TCB->pxTopOfStack);                                                             
                xTaskCallApplicationTaskHook( pxCurrentTCB,param );

然后当调用 semafor 的 queue 和 lis 时,它指向正确的地址。并检索数据结构。

于 2012-03-14T11:36:21.023 回答
0

你想做什么,怎么做。什么是 COREB?

您发布代码片段的函数是否未经官方 FreeRTOS 代码修改?该代码通常被编译并链接到可执行文件中,因此您不会收到任何此类运行时错误。如果有任何问题,您只会得到编译/链接错误。如果您遇到运行时错误,那么您是在尝试解释代码而不是编译它吗?

于 2012-02-07T09:40:17.957 回答