From 22165896d5542280b4e54cbe1d4661b98af49a38 Mon Sep 17 00:00:00 2001 From: Brian Swetland Date: Tue, 8 Apr 2008 22:34:46 -0700 Subject: kernel_debugger_core: add interrupt-context debugger core MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This provides kernel_debugger() which can be called from an interrupt context low level debugger wedge to execute commands that inspect kernel state. It doesn't do much on its own. Signed-off-by: Brian Swetland kernel_debugger_core: Add sysrq command. sysrq will run the sysrq command and dump what was added to the kernel log while the command ran. Signed-off-by: Brian Swetland Signed-off-by: Arve Hjønnevåg --- drivers/misc/kernel_debugger.c | 79 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 79 insertions(+) create mode 100644 drivers/misc/kernel_debugger.c (limited to 'drivers/misc/kernel_debugger.c') diff --git a/drivers/misc/kernel_debugger.c b/drivers/misc/kernel_debugger.c new file mode 100644 index 000000000000..44c19fd2f264 --- /dev/null +++ b/drivers/misc/kernel_debugger.c @@ -0,0 +1,79 @@ +/* drivers/android/kernel_debugger.c + * + * Guts of the kernel debugger. + * Needs something to actually push commands to it. + * + * Copyright (C) 2007-2008 Google, Inc. + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include +#include +#include +#include +#include +#include + +#define dprintf(fmt...) (ctxt->printf(ctxt->cookie, fmt)) + +static void do_ps(struct kdbg_ctxt *ctxt) +{ + struct task_struct *g, *p; + unsigned state; + static const char stat_nam[] = "RSDTtZX"; + + dprintf("pid ppid prio task pc\n"); + read_lock(&tasklist_lock); + do_each_thread(g, p) { + state = p->state ? __ffs(p->state) + 1 : 0; + dprintf("%5d %5d %4d ", p->pid, p->parent->pid, p->prio); + dprintf("%-13.13s %c", p->comm, + state >= sizeof(stat_nam) ? '?' : stat_nam[state]); + if (state == TASK_RUNNING) + dprintf(" running\n"); + else + dprintf(" %08lx\n", thread_saved_pc(p)); + } while_each_thread(g, p); + read_unlock(&tasklist_lock); +} + +int log_buf_copy(char *dest, int idx, int len); +extern int do_syslog(int type, char __user *bug, int count); +static void do_sysrq(struct kdbg_ctxt *ctxt, char rq) +{ + char buf[128]; + int ret; + int idx = 0; + do_syslog(5 /* clear */, NULL, 0); + handle_sysrq(rq, NULL); + while (1) { + ret = log_buf_copy(buf, idx, sizeof(buf) - 1); + if (ret <= 0) + break; + buf[ret] = 0; + dprintf("%s", buf); + idx += ret; + } +} + +int kernel_debugger(struct kdbg_ctxt *ctxt, char *cmd) +{ + if (!strcmp(cmd, "ps")) + do_ps(ctxt); + if (!strcmp(cmd, "sysrq")) + do_sysrq(ctxt, 'h'); + if (!strncmp(cmd, "sysrq ", 6)) + do_sysrq(ctxt, cmd[6]); + + return 0; +} + -- cgit v1.2.3