1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 4 * Copyright (C) 2013 Richard Weinberger <richrd@nod.at>
 
 
 
 
 5 */
 6
 7#include <linux/kallsyms.h>
 8#include <linux/kernel.h>
 9#include <linux/module.h>
10#include <linux/sched.h>
11#include <linux/sched/debug.h>
12#include <linux/sched/task_stack.h>
13
14#include <asm/sysrq.h>
15#include <asm/stacktrace.h>
16#include <os.h>
17
18static void _print_addr(void *data, unsigned long address, int reliable)
 
 
 
 
 
19{
20	const char *loglvl = data;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
21
22	printk("%s [<%08lx>] %s%pS\n", loglvl, address, reliable ? "" : "? ",
23		(void *)address);
 
 
 
 
 
24}
25
26static const struct stacktrace_ops stackops = {
27	.address = _print_addr
28};
 
 
 
 
 
29
30void show_stack(struct task_struct *task, unsigned long *stack,
31		       const char *loglvl)
32{
 
33	struct pt_regs *segv_regs = current->thread.segv_regs;
34	int i;
35
36	if (!segv_regs && os_is_signal_stack()) {
37		pr_err("Received SIGSEGV in SIGSEGV handler,"
38				" aborting stack trace!\n");
39		return;
40	}
41
 
 
 
 
42	if (!stack)
43		stack = get_stack_pointer(task, segv_regs);
44
45	printk("%sStack:\n", loglvl);
 
46	for (i = 0; i < 3 * STACKSLOTS_PER_LINE; i++) {
47		if (kstack_end(stack))
48			break;
49		if (i && ((i % STACKSLOTS_PER_LINE) == 0))
50			pr_cont("\n");
51		pr_cont(" %08lx", READ_ONCE_NOCHECK(*stack));
52		stack++;
53	}
 
54
55	printk("%sCall Trace:\n", loglvl);
56	dump_trace(current, &stackops, (void *)loglvl);
57}

 
 1/*
 2 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 3 * Copyright (C) 2013 Richard Weinberger <richrd@nod.at>
 4 *
 5 * This program is free software; you can redistribute it and/or modify
 6 * it under the terms of the GNU General Public License version 2 as
 7 * published by the Free Software Foundation.
 8 */
 9
10#include <linux/kallsyms.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/sched.h>
 
 
 
14#include <asm/sysrq.h>
 
15#include <os.h>
16
17struct stack_frame {
18	struct stack_frame *next_frame;
19	unsigned long return_address;
20};
21
22static void do_stack_trace(unsigned long *sp, unsigned long bp)
23{
24	int reliable;
25	unsigned long addr;
26	struct stack_frame *frame = (struct stack_frame *)bp;
27
28	printk(KERN_INFO "Call Trace:\n");
29	while (((long) sp & (THREAD_SIZE-1)) != 0) {
30		addr = *sp;
31		if (__kernel_text_address(addr)) {
32			reliable = 0;
33			if ((unsigned long) sp == bp + sizeof(long)) {
34				frame = frame ? frame->next_frame : NULL;
35				bp = (unsigned long)frame;
36				reliable = 1;
37			}
38
39			printk(KERN_INFO " [<%08lx>]", addr);
40			printk(KERN_CONT " %s", reliable ? "" : "? ");
41			print_symbol(KERN_CONT "%s", addr);
42			printk(KERN_CONT "\n");
43		}
44		sp++;
45	}
46	printk(KERN_INFO "\n");
47}
48
49static unsigned long get_frame_pointer(struct task_struct *task,
50				       struct pt_regs *segv_regs)
51{
52	if (!task || task == current)
53		return segv_regs ? PT_REGS_BP(segv_regs) : current_bp();
54	else
55		return KSTK_EBP(task);
56}
57
58static unsigned long *get_stack_pointer(struct task_struct *task,
59					struct pt_regs *segv_regs)
60{
61	if (!task || task == current)
62		return segv_regs ? (unsigned long *)PT_REGS_SP(segv_regs) : current_sp();
63	else
64		return (unsigned long *)KSTK_ESP(task);
65}
66
67void show_stack(struct task_struct *task, unsigned long *stack)
 
68{
69	unsigned long *sp = stack, bp = 0;
70	struct pt_regs *segv_regs = current->thread.segv_regs;
71	int i;
72
73	if (!segv_regs && os_is_signal_stack()) {
74		printk(KERN_ERR "Received SIGSEGV in SIGSEGV handler,"
75				" aborting stack trace!\n");
76		return;
77	}
78
79#ifdef CONFIG_FRAME_POINTER
80	bp = get_frame_pointer(task, segv_regs);
81#endif
82
83	if (!stack)
84		sp = get_stack_pointer(task, segv_regs);
85
86	printk(KERN_INFO "Stack:\n");
87	stack = sp;
88	for (i = 0; i < 3 * STACKSLOTS_PER_LINE; i++) {
89		if (kstack_end(stack))
90			break;
91		if (i && ((i % STACKSLOTS_PER_LINE) == 0))
92			printk(KERN_CONT "\n");
93		printk(KERN_CONT " %08lx", *stack++);
 
94	}
95	printk(KERN_CONT "\n");
96
97	do_stack_trace(sp, bp);
 
98}