104 lines
2.2 KiB
C
Executable File
104 lines
2.2 KiB
C
Executable File
/*
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* Copyright (c) 2020 Samsung Electronics Co., Ltd.
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* http://www.samsung.com
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*
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* Samsung TN debugging code
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/smp.h>
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#include <linux/sched.h>
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#include <linux/sec_debug.h>
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#include <linux/stacktrace.h>
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#include <linux/debug-snapshot.h>
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#include <asm/stack_pointer.h>
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#include <asm/stacktrace.h>
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#include <linux/sched/debug.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include "../../../kernel/sched/sched.h"
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#include <linux/sched/signal.h>
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static call_single_data_t csd;
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static struct task_struct *suspect;
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static inline char get_state(struct task_struct *p)
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{
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char state_array[] = {'R', 'S', 'D', 'T', 't', 'X', 'Z', 'P', 'x', 'K', 'W', 'I', 'N'};
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unsigned char idx = 0;
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unsigned long state;
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if (!p)
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return 0;
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state = (p->state | p->exit_state) & (TASK_STATE_MAX - 1);
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while (state) {
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idx++;
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state >>= 1;
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}
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return state_array[idx];
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}
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static void show_callstack(void *dummy)
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{
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#ifdef CONFIG_SEC_DEBUG_AUTO_COMMENT
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show_stack_auto_comment(NULL, NULL);
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#else
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show_stack(NULL, NULL);
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#endif
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}
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static struct task_struct *secdbg_softdog_find_key_suspect()
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{
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struct task_struct *c, *g;
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for_each_process(g) {
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if (g->pid == 1)
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suspect = g;
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else if (!strcmp(g->comm, "system_server")) {
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suspect = g;
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for_each_thread(g, c) {
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if (!strcmp(c->comm, "watchdog")) {
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suspect = c;
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goto out;
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}
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}
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goto out;
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}
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}
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out:
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return suspect;
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}
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void secdbg_softdog_show_info(void)
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{
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struct task_struct *p = NULL;
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p = secdbg_softdog_find_key_suspect();
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if (p) {
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pr_auto(ASL5, "[SOFTDOG] %s:%d %c(%d) exec:%lluns\n",
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p->comm, p->pid, get_state(p), (int)p->state, p->se.exec_start);
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if (task_running(task_rq(p), p)) {
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csd.flags = 0;
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csd.func = show_callstack;
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csd.info = 0;
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smp_call_function_single_async(task_cpu(p), &csd);
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} else {
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#ifdef CONFIG_SEC_DEBUG_AUTO_COMMENT
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show_stack_auto_comment(p, NULL);
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#else
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show_stack(p, NULL);
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#endif
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}
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} else {
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pr_auto(ASL5, "[SOFTDOG] Init task not exist!\n");
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}
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}
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