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/*
**************************************************************************
*
* Component =
*
* Synopsis = rdbg/i386/excep.c
*
* $Id$
*
**************************************************************************
*/
#include <rtems.h>
#include <rtems/error.h>
#include <assert.h>
#include <errno.h>
#include <rdbg/rdbg.h>
#include <rdbg/servrpc.h>
/* -----------------------------------------------------------------
Maping of hardware exceptions into Unix-like signal numbers.
It is identical to the one used by the PM and the AM.
----------------------------------------------------------------- */
int
ExcepToSig (Exception_context *ctx)
{
int excep = getExcNum (ctx);
switch (excep) {
case I386_EXCEPTION_MATH_COPROC_UNAVAIL:
case I386_EXCEPTION_I386_COPROC_SEG_ERR:
case I386_EXCEPTION_FLOAT_ERROR:
case I386_EXCEPTION_BOUND:
return SIGFPE;
case I386_EXCEPTION_DEBUG:
case I386_EXCEPTION_BREAKPOINT:
case I386_EXCEPTION_ENTER_RDBG:
return SIGTRAP;
case I386_EXCEPTION_OVERFLOW:
case I386_EXCEPTION_DIVIDE_BY_ZERO:
case I386_EXCEPTION_ILLEGAL_INSTR:
return SIGILL;
case I386_EXCEPTION_SEGMENT_NOT_PRESENT:
case I386_EXCEPTION_STACK_SEGMENT_FAULT:
case I386_EXCEPTION_GENERAL_PROT_ERR:
case I386_EXCEPTION_PAGE_FAULT:
return SIGSEGV;
default:
break;
}
return SIGKILL;
}
/*----- Breakpoint Exception management -----*/
/*
* Handler for Breakpoint Exceptions :
* software breakpoints.
*/
void
BreakPointExcHdl(CPU_Exception_frame *ctx)
{
rtems_status_code status;
rtems_id continueSemId;
if ( (justSaveContext) && (ctx->idtIndex == I386_EXCEPTION_ENTER_RDBG) ) {
PushSavedExceptCtx (_Thread_Executing->Object.id, ctx);
justSaveContext = 0;
}
else {
if (ctx->idtIndex != I386_EXCEPTION_DEBUG){
NbSerializedCtx++;
rtems_semaphore_obtain(serializeSemId, RTEMS_WAIT, RTEMS_NO_TIMEOUT);
NbSerializedCtx--;
}
currentTargetThread = _Thread_Executing->Object.id;
#ifdef DDEBUG
printk("----------------------------------------------------------\n");
printk("Exception %d caught at PC %x by thread %d\n",
ctx->idtIndex,
ctx->eip,
_Thread_Executing->Object.id);
printk("----------------------------------------------------------\n");
printk("Processor execution context at time of the fault was :\n");
printk("----------------------------------------------------------\n");
printk(" EAX = %x EBX = %x ECX = %x EDX = %x\n",
ctx->eax, ctx->ebx, ctx->ecx, ctx->edx);
printk(" ESI = %x EDI = %x EBP = %x ESP = %x\n",
ctx->esi, ctx->edi, ctx->ebp, ctx->esp0);
printk("----------------------------------------------------------\n");
printk("Error code pushed by processor itself (if not 0) = %x\n",
ctx->faultCode);
printk("----------------------------------------------------------\n\n");
#endif
status = rtems_semaphore_create (rtems_build_name('D', 'B', 'G', 'c'),
0,
RTEMS_FIFO |
RTEMS_COUNTING_SEMAPHORE |
RTEMS_NO_INHERIT_PRIORITY |
RTEMS_NO_PRIORITY_CEILING |
RTEMS_LOCAL,
0,
&continueSemId);
if (status != RTEMS_SUCCESSFUL)
rtems_panic ("Can't create continue semaphore: `%s'\n",rtems_status_text(status));
PushExceptCtx (_Thread_Executing->Object.id, continueSemId, ctx);
switch (ctx->idtIndex){
case I386_EXCEPTION_DEBUG:
DPRINTF((" DEBUG EXCEPTION !!!\n"));
ctx->eflags &= ~EFLAGS_TF;
ExitForSingleStep-- ;
rtems_semaphore_release( wakeupEventSemId );
break;
case I386_EXCEPTION_BREAKPOINT:
DPRINTF((" BREAKPOINT EXCEPTION !!!\n"));
rtems_semaphore_release( wakeupEventSemId );
break;
case I386_EXCEPTION_ENTER_RDBG:
DPRINTF((" ENTER RDBG !!!\n"));
rtems_semaphore_release( wakeupEventSemId );
break;
default:
DPRINTF((" OTHER EXCEPTION !!!\n"));
rtems_semaphore_release( wakeupEventSemId );
break;
}
rtems_semaphore_obtain(continueSemId, RTEMS_WAIT, RTEMS_NO_TIMEOUT);
PopExceptCtx (_Thread_Executing->Object.id);
rtems_semaphore_delete(continueSemId);
}
}
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