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Commit something we found useful at work at one point. Add sysctls for

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debug.kdb.panic and debug.kdb.trap alongside the existing debug.kdb.enter
sysctl.  'panic' causes a panic, and 'trap' causes a page fault.  We used
these to ensure that crash dumps succeed from those two common failure
modes.  This avoids the need for creating a 'panic' kld module.
This commit is contained in:
Peter Wemm 2005-10-26 22:40:07 +00:00
parent a9fbe5d07b
commit 40c9966a37
1 changed files with 40 additions and 0 deletions
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40
sys/kern/subr_kdb.c
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@ -63,6 +63,8 @@ SET_DECLARE(kdb_dbbe_set, struct kdb_dbbe);
static int kdb_sysctl_available(SYSCTL_HANDLER_ARGS);
static int kdb_sysctl_current(SYSCTL_HANDLER_ARGS);
static int kdb_sysctl_enter(SYSCTL_HANDLER_ARGS);
static int kdb_sysctl_panic(SYSCTL_HANDLER_ARGS);
static int kdb_sysctl_trap(SYSCTL_HANDLER_ARGS);
SYSCTL_NODE(_debug, OID_AUTO, kdb, CTLFLAG_RW, NULL, "KDB nodes");
@ -75,6 +77,12 @@ SYSCTL_PROC(_debug_kdb, OID_AUTO, current, CTLTYPE_STRING | CTLFLAG_RW, 0, 0,
SYSCTL_PROC(_debug_kdb, OID_AUTO, enter, CTLTYPE_INT | CTLFLAG_RW, 0, 0,
kdb_sysctl_enter, "I", "set to enter the debugger");
SYSCTL_PROC(_debug_kdb, OID_AUTO, panic, CTLTYPE_INT | CTLFLAG_RW, 0, 0,
kdb_sysctl_panic, "I", "set to panic the kernel");
SYSCTL_PROC(_debug_kdb, OID_AUTO, trap, CTLTYPE_INT | CTLFLAG_RW, 0, 0,
kdb_sysctl_trap, "I", "set cause a page fault");
/*
* Flag indicating whether or not to IPI the other CPUs to stop them on
* entering the debugger. Sometimes, this will result in a deadlock as
@ -158,6 +166,38 @@ kdb_sysctl_enter(SYSCTL_HANDLER_ARGS)
return (0);
}
static int
kdb_sysctl_panic(SYSCTL_HANDLER_ARGS)
{
int error, i;
error = sysctl_wire_old_buffer(req, sizeof(int));
if (error == 0) {
i = 0;
error = sysctl_handle_int(oidp, &i, 0, req);
}
if (error != 0 || req->newptr == NULL)
return (error);
panic("kdb_sysctl_panic");
return (0);
}
static int
kdb_sysctl_trap(SYSCTL_HANDLER_ARGS)
{
int error, i;
int *addr = (int *)0x10;
error = sysctl_wire_old_buffer(req, sizeof(int));
if (error == 0) {
i = 0;
error = sysctl_handle_int(oidp, &i, 0, req);
}
if (error != 0 || req->newptr == NULL)
return (error);
return (*addr);
}
/*
* Solaris implements a new BREAK which is initiated by a character sequence
* CR ~ ^b which is similar to a familiar pattern used on Sun servers by the