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stack frames can be overwrapped for eg. softintr.

This commit is contained in:
yamt 2002-06-26 08:18:01 +00:00
parent e5370cdc4c
commit 175fe41cad
1 changed files with 6 additions and 3 deletions
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9
sys/arch/i386/i386/db_trace.c
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@ -1,4 +1,4 @@
/* $NetBSD: db_trace.c,v 1.31 2001/11/15 07:03:29 lukem Exp $ */
/* $NetBSD: db_trace.c,v 1.32 2002/06/26 08:18:01 yamt Exp $ */
/*
* Mach Operating System
@ -27,7 +27,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: db_trace.c,v 1.31 2001/11/15 07:03:29 lukem Exp $");
__KERNEL_RCSID(0, "$NetBSD: db_trace.c,v 1.32 2002/06/26 08:18:01 yamt Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -249,6 +249,7 @@ db_stack_trace_print(addr, have_addr, count, modif, pr)
db_sym_t sym;
#define MAXNARG 16
char *argnames[MAXNARG], **argnp = NULL;
db_addr_t lastcallpc;
sym = db_search_symbol(callpc, DB_STGY_ANY, &offset);
db_symbol_values(sym, &name, NULL);
@ -348,6 +349,7 @@ db_stack_trace_print(addr, have_addr, count, modif, pr)
}
lastframe = frame;
lastcallpc = callpc;
db_nextframe(&frame, &callpc, &frame->f_arg0, is_trap, pr);
if (frame == 0) {
@ -356,7 +358,8 @@ db_stack_trace_print(addr, have_addr, count, modif, pr)
}
if (INKERNEL((int)frame)) {
/* staying in kernel */
if (frame <= lastframe) {
if (frame < lastframe ||
(frame == lastframe && callpc == lastcallpc)) {
(*pr)("Bad frame pointer: %p\n", frame);
break;
}