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with 'options DDB'). Setting this to `ddb' or `gdb' breaks into the kernel debugger in the corresponding mode. This mechanism has proven very useful at Whistle for setting breakpoints, etc., while doing remote serial line kernel debugging. Obtained from: Whistle source tree
78 lines
2.9 KiB
C
78 lines
2.9 KiB
C
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/*
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* db_sysctl.c
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*
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* Copyright (c) 2000 Whistle Communications, Inc.
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* All rights reserved.
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*
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* Subject to the following obligations and disclaimer of warranty, use and
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* redistribution of this software, in source or object code forms, with or
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* without modifications are expressly permitted by Whistle Communications;
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* provided, however, that:
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* 1. Any and all reproductions of the source or object code must include the
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* copyright notice above and the following disclaimer of warranties; and
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* 2. No rights are granted, in any manner or form, to use Whistle
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* Communications, Inc. trademarks, including the mark "WHISTLE
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* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
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* such appears in the above copyright notice or in the software.
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*
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* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
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* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
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* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
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* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
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* WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
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* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
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* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
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* IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
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* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
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* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* Author: Archie Cobbs <archie@whistle.com>
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <sys/reboot.h>
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#define DESCRIPTION "Set to `ddb' or `gdb' to enter the kernel debugger"
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#define READ_MODE ""
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#define MODE_DDB "ddb"
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#define MODE_GDB "gdb"
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static int
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sysctl_debug_enter_debugger SYSCTL_HANDLER_ARGS
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{
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char dmode[64];
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int error;
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strncpy(dmode, READ_MODE, sizeof(dmode) - 1);
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dmode[sizeof(dmode) - 1] = '\0';
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error = sysctl_handle_string(oidp, &dmode[0], sizeof(dmode), req);
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if (error == 0 && req->newptr != NULL) {
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if (strcmp(dmode, MODE_DDB) == 0)
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boothowto &= ~RB_GDB;
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else if (strcmp(dmode, MODE_GDB) == 0)
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boothowto |= RB_GDB;
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else
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return EINVAL;
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Debugger("debug.enter_debugger");
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}
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return error;
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}
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SYSCTL_PROC(_debug, OID_AUTO, enter_debugger, CTLTYPE_STRING | CTLFLAG_RW,
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0, 0, sysctl_debug_enter_debugger, "A", DESCRIPTION);
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