128 lines
2.2 KiB
C
128 lines
2.2 KiB
C
/*
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Trap handling
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*/
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/* $Header$ */
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#include <setjmp.h>
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#include <em_abs.h>
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#include "logging.h"
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#include "global.h"
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#include "log.h"
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#include "trap.h"
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#include "warn.h"
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#include "mem.h"
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#include "shadow.h"
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#include "linfil.h"
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#include "rsb.h"
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#include "fra.h"
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extern char *sprintf();
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extern jmp_buf trapbuf; /* from main.c */
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int must_test; /* TEST-bit on in EM header word 2 */
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int signalled;
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PRIVATE int nonreturnable();
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PRIVATE char *trap_msg[] = {
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#include "trap_msg" /* generated from $(EM)/etc/traps */
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""
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};
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char *trap2text(nr) /* transient */
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int nr;
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{
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if ( /* trap number in predefined range */
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nr < sizeof (trap_msg) / sizeof (trap_msg[0])
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&& /* trap message not the empty string */
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trap_msg[nr][0]
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) {
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return trap_msg[nr];
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}
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else {
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static char buf[50];
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sprintf(buf, "TRAP %d", nr);
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return buf;
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}
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}
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/*ARGSUSED*/
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do_trap(nr, L, F)
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int nr;
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int L;
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char *F;
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{
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/*
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1. The trap has not been masked.
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2. This routine does not return; it either ends in a call of
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fatal() or in a longjmp().
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*/
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static int rec_nr; /* Recursive trap number */
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static int rec_trap = 0; /* To detect traps inside do_trap() */
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register long tpi; /* Trap Procedure Identifier */
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LOG(("@t1 trap(%d) [%s: %d]", nr, F, L));
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warning(WMSG + nr);
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switch (OnTrap) {
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case TR_ABORT:
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fatal("trap \"%s\" before program started", trap2text(nr));
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/*NOTREACHED*/
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case TR_HALT:
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fatal("trap \"%s\" not caught at %s",
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trap2text(nr), position());
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/*NOTREACHED*/
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case TR_TRAP:
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/* execute the trap */
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if (rec_trap) {
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fatal("recursive trap; first trap number was \"%s\"",
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trap2text(rec_nr));
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}
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rec_trap = 1;
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rec_nr = nr;
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/* save the Function Return Area */
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pushFRA(FRASize);
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wpush((long)FRASize);
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wpush((long)FRA_def);
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/* set up the trap number as the only parameter */
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wpush((long) nr);
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tpi = TrapPI; /* allowed since OnTrap == TR_TRAP */
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TrapPI = 0;
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OnTrap = TR_HALT;
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call(tpi, (nonreturnable(nr) ? RSB_NRT : RSB_RTT));
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rec_trap = 0;
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longjmp(trapbuf, 1);
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/*NOTREACHED*/
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}
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}
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PRIVATE int nonreturnable(nr)
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int nr;
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{
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switch (nr) {
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case ESTACK:
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case EILLINS:
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case EODDZ:
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case ECASE:
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case EMEMFLT:
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case EBADPTR:
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case EBADPC:
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case EBADLAE:
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case EBADGTO:
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return 1;
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default:
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return 0;
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}
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/*NOTREACHED*/
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}
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