On Friday, 19 March 1999 08:00:00 UTC, Wu, Huang wrote:

Hello vxWorks world,
Does anyone know how to use excHookAdd() in a task? I have written a test code, but the exception handler is not called when an exception occurs.
Is there anyone who likes to share their successful story with me?

Thanks in advance

Huang

#include "vxWorks.h"
#include "taskLib.h"
#include "stdio.h"
#include "arch/mc68k/archMc68k.h"
#include "arch/mc68k/regsMc68k.h"
#include "arch/mc68k/esfMc68k.h"
#include "semLib.h"
#include "excLib.h"

/* Globals */
SEM_ID syncSem;

/* Forward declarations */
void myHandler (int, int, ESF68K_BA *);
void testExc (void);
void fuBar (void);

/* Function: myHandler
* Purpose : User-defined handler executes after a hardware exception oc
curs.
* Returns : N/A
*/
void myHandler (int task, int vector, ESF68K_BA * pEsf)
{

printf ("\n\n");
printf ("USER-DEFINED HANDLER...\n");
printf (" Offending task ID: 0x%x\n", task);
printf (" Exception vector: %d\n", vector);
printf (" Status reg: %d\n", pEsf->sr);

semGive (syncSem); /* activate fuBar() */
}

/* function: testExc
* Purpose : Test the execution of a user-defined exception handler insta
lled
* vio excHookAdd(). This routine will generate an exception wh ich,
* in turn, will invoke the user-defined exception handler. The
* user-defined handler will give a semaphore which unblocks an other
* task - fuBar(). fuBar() will then generate another exceptio n.
* Returns : N/A
*/

void testExc (void)
{
unsigned long goomBah;

/* add the exception hook routine in this task */
excHookAdd ((FUNCPTR) myHandler);

/* create semaphore */
syncSem = semBCreate (SEM_Q_FIFO, SEM_EMPTY);

/* spawn a task which will be called after the hook activates */
taskSpawn ("tFuBar", 100, 0, 2000, (FUNCPTR)fuBar, 0,0,0,0,0,0,0,0,0, 0);

/* this is a NON-EXISTANT ADDR*/
goomBah = *(unsigned long *)0xfffff98;
}

/* function: fuBar
* Purpose : Pend on a semaphore given by a user-defined exception handle r.
* After getting the semaphore, force another exception.
* Returns : N/A
*/

void fuBar (void)
{
unsigned long goomBah = 0x0000ffff;

/* wait for exception event to occur */
semTake (syncSem, WAIT_FOREVER);

printf ("\nfuBar() got the semaphore\n");

/* a brief delay to give the system a chance to recover before */
/* we generate the next exception. */
taskDelay (10);

/* assign to a NON-EXISTANT ADDRESS */
*(unsigned long *)0xfffff98 = goomBah;

}

I

Do you know how to use this successfully?

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