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Do not try to get the faulting instruction if eip is 0. 

This makes 'trace' work when the kernel paniced because it jumped to
a NULL function pointer.
This commit is contained in:
bouyer 2009-08-26 23:17:03 +00:00
parent f0ef6f6e4e
commit 559c33c2d0
1 changed files with 3 additions and 3 deletions
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6
sys/arch/i386/i386/db_trace.c
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@ -1,4 +1,4 @@
/* $NetBSD: db_trace.c,v 1.61 2009/03/07 22:02:16 ad Exp $ */
/* $NetBSD: db_trace.c,v 1.62 2009/08/26 23:17:03 bouyer Exp $ */
/*
* Mach Operating System
@ -27,7 +27,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: db_trace.c,v 1.61 2009/03/07 22:02:16 ad Exp $");
__KERNEL_RCSID(0, "$NetBSD: db_trace.c,v 1.62 2009/08/26 23:17:03 bouyer Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -501,7 +501,7 @@ db_stack_trace_print(db_expr_t addr, bool have_addr, db_expr_t count,
sym = db_frame_info(frame, callpc, &name, &offset, &is_trap,
&narg);
if (lastframe == 0 && sym == (db_sym_t)0) {
if (lastframe == 0 && sym == (db_sym_t)0 && callpc != 0) {
/* Symbol not found, peek at code */
int instr = db_get_value(callpc, 4, false);