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kdb_backtrace: stack(9)-based code to print backtrace without any backend

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The idea is to add KDB and KDB_TRACE options to GENERIC kernels on
stable branches, so that at least the minimal information is produced
for non-specific panics like traps on page faults.
The GENERICs in stable branches seem to already include STACK option.

Reviewed by:	attilio
MFC after:	2 weeks
This commit is contained in:
Andriy Gapon 2010-09-21 15:07:44 +00:00
parent 62ec0abc3c
commit 088acbb312
1 changed files with 11 additions and 0 deletions
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11
sys/kern/subr_kdb.c
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@ -28,6 +28,7 @@
__FBSDID("$FreeBSD$");
#include "opt_kdb.h"
#include "opt_stack.h"
#include <sys/param.h>
#include <sys/systm.h>
@ -37,6 +38,7 @@ __FBSDID("$FreeBSD$");
#include <sys/pcpu.h>
#include <sys/proc.h>
#include <sys/smp.h>
#include <sys/stack.h>
#include <sys/sysctl.h>
#include <machine/kdb.h>
@ -300,6 +302,15 @@ kdb_backtrace(void)
printf("KDB: stack backtrace:\n");
kdb_dbbe->dbbe_trace();
}
#ifdef STACK
else {
struct stack st;
printf("KDB: stack backtrace:\n");
stack_save(&st);
stack_print(&st);
}
#endif
}
/*