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/*
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**************************************************************************
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*
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* Component =
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*
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* Synopsis = rdbg/i386/excep.c
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*
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* $Id: excep_f.c,v 1.2 2001-09-27 12:02:01 chris Exp $
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*
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**************************************************************************
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*/
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#include <rtems.h>
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#include <rtems/error.h>
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#include <assert.h>
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#include <errno.h>
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#include <rdbg/rdbg.h>
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#include <rdbg/servrpc.h>
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/* -----------------------------------------------------------------
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Maping of hardware exceptions into Unix-like signal numbers.
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It is identical to the one used by the PM and the AM.
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----------------------------------------------------------------- */
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int
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ExcepToSig (Exception_context *ctx)
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{
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int excep = getExcNum (ctx);
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switch (excep) {
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case I386_EXCEPTION_MATH_COPROC_UNAVAIL:
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case I386_EXCEPTION_I386_COPROC_SEG_ERR:
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case I386_EXCEPTION_FLOAT_ERROR:
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case I386_EXCEPTION_BOUND:
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return SIGFPE;
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case I386_EXCEPTION_DEBUG:
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case I386_EXCEPTION_BREAKPOINT:
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case I386_EXCEPTION_ENTER_RDBG:
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return SIGTRAP;
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case I386_EXCEPTION_OVERFLOW:
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case I386_EXCEPTION_DIVIDE_BY_ZERO:
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case I386_EXCEPTION_ILLEGAL_INSTR:
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return SIGILL;
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case I386_EXCEPTION_SEGMENT_NOT_PRESENT:
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case I386_EXCEPTION_STACK_SEGMENT_FAULT:
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case I386_EXCEPTION_GENERAL_PROT_ERR:
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case I386_EXCEPTION_PAGE_FAULT:
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return SIGSEGV;
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default:
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break;
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}
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return SIGKILL;
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}
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/*----- Breakpoint Exception management -----*/
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/*
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* Handler for Breakpoint Exceptions :
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* software breakpoints.
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*/
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void
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BreakPointExcHdl(CPU_Exception_frame *ctx)
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{
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rtems_status_code status;
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rtems_id continueSemId;
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if ( (justSaveContext) && (ctx->idtIndex == I386_EXCEPTION_ENTER_RDBG) ) {
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PushSavedExceptCtx (_Thread_Executing->Object.id, ctx);
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justSaveContext = 0;
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}
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else {
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if (ctx->idtIndex != I386_EXCEPTION_DEBUG){
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NbSerializedCtx++;
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rtems_semaphore_obtain(serializeSemId, RTEMS_WAIT, RTEMS_NO_TIMEOUT);
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NbSerializedCtx--;
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}
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currentTargetThread = _Thread_Executing->Object.id;
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#ifdef DDEBUG
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printk("----------------------------------------------------------\n");
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printk("Exception %d caught at PC %x by thread %d\n",
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ctx->idtIndex,
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ctx->eip,
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_Thread_Executing->Object.id);
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printk("----------------------------------------------------------\n");
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printk("Processor execution context at time of the fault was :\n");
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printk("----------------------------------------------------------\n");
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printk(" EAX = %x EBX = %x ECX = %x EDX = %x\n",
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ctx->eax, ctx->ebx, ctx->ecx, ctx->edx);
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printk(" ESI = %x EDI = %x EBP = %x ESP = %x\n",
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ctx->esi, ctx->edi, ctx->ebp, ctx->esp0);
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printk("----------------------------------------------------------\n");
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printk("Error code pushed by processor itself (if not 0) = %x\n",
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ctx->faultCode);
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printk("----------------------------------------------------------\n\n");
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#endif
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status = rtems_semaphore_create (rtems_build_name('D', 'B', 'G', 'c'),
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0,
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RTEMS_FIFO |
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RTEMS_COUNTING_SEMAPHORE |
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RTEMS_NO_INHERIT_PRIORITY |
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RTEMS_NO_PRIORITY_CEILING |
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RTEMS_LOCAL,
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0,
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&continueSemId);
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if (status != RTEMS_SUCCESSFUL)
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rtems_panic ("Can't create continue semaphore: `%s'\n",rtems_status_text(status));
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PushExceptCtx (_Thread_Executing->Object.id, continueSemId, ctx);
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switch (ctx->idtIndex){
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case I386_EXCEPTION_DEBUG:
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DPRINTF((" DEBUG EXCEPTION !!!\n"));
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ctx->eflags &= ~EFLAGS_TF;
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ExitForSingleStep-- ;
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rtems_semaphore_release( wakeupEventSemId );
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break;
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case I386_EXCEPTION_BREAKPOINT:
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DPRINTF((" BREAKPOINT EXCEPTION !!!\n"));
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rtems_semaphore_release( wakeupEventSemId );
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break;
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case I386_EXCEPTION_ENTER_RDBG:
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DPRINTF((" ENTER RDBG !!!\n"));
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rtems_semaphore_release( wakeupEventSemId );
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break;
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default:
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DPRINTF((" OTHER EXCEPTION !!!\n"));
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rtems_semaphore_release( wakeupEventSemId );
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break;
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}
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rtems_semaphore_obtain(continueSemId, RTEMS_WAIT, RTEMS_NO_TIMEOUT);
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PopExceptCtx (_Thread_Executing->Object.id);
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rtems_semaphore_delete(continueSemId);
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}
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}
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