[mirror_ubuntu-bionic-kernel.git] / arch / um / kernel / sysrq.c

/*
 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Copyright (C) 2013 Richard Weinberger <richrd@nod.at>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/kallsyms.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <asm/sysrq.h>
#include <os.h>

struct stack_frame {
	struct stack_frame *next_frame;
	unsigned long return_address;
};

static void print_stack_trace(unsigned long *sp, unsigned long bp)
{
	int reliable;
	unsigned long addr;
	struct stack_frame *frame = (struct stack_frame *)bp;

	printk(KERN_INFO "Call Trace:\n");
	while (((long) sp & (THREAD_SIZE-1)) != 0) {
		addr = *sp;
		if (__kernel_text_address(addr)) {
			reliable = 0;
			if ((unsigned long) sp == bp + sizeof(long)) {
				frame = frame ? frame->next_frame : NULL;
				bp = (unsigned long)frame;
				reliable = 1;
			}

			printk(KERN_INFO " [<%08lx>]", addr);
			printk(KERN_CONT " %s", reliable ? "" : "? ");
			print_symbol(KERN_CONT "%s", addr);
			printk(KERN_CONT "\n");
		}
		sp++;
	}
	printk(KERN_INFO "\n");
}

/*Stolen from arch/i386/kernel/traps.c */
static const int kstack_depth_to_print = 24;

static unsigned long get_frame_pointer(struct task_struct *task,
				       struct pt_regs *segv_regs)
{
	if (!task || task == current)
		return segv_regs ? PT_REGS_BP(segv_regs) : current_bp();
	else
		return KSTK_EBP(task);
}

static unsigned long *get_stack_pointer(struct task_struct *task,
					struct pt_regs *segv_regs)
{
	if (!task || task == current)
		return segv_regs ? (unsigned long *)PT_REGS_SP(segv_regs) : current_sp();
	else
		return (unsigned long *)KSTK_ESP(task);
}

void show_stack(struct task_struct *task, unsigned long *stack)
{
	unsigned long *sp = stack, bp = 0;
	struct pt_regs *segv_regs = current->thread.segv_regs;
	int i;

	if (!segv_regs && os_is_signal_stack()) {
		printk(KERN_ERR "Received SIGSEGV in SIGSEGV handler,"
				" aborting stack trace!\n");
		return;
	}

#ifdef CONFIG_FRAME_POINTER
	bp = get_frame_pointer(task, segv_regs);
#endif

	if (!stack)
		sp = get_stack_pointer(task, segv_regs);

	printk(KERN_INFO "Stack:\n");
	stack = sp;
	for (i = 0; i < kstack_depth_to_print; i++) {
		if (kstack_end(stack))
			break;
		if (i && ((i % STACKSLOTS_PER_LINE) == 0))
			printk(KERN_CONT "\n");
		printk(KERN_CONT " %08lx", *stack++);
	}
	printk(KERN_CONT "\n");

	print_stack_trace(sp, bp);
}
Commit	Line	Data
c5d4bb17 JD	1	/*
c5d4bb17 JD	2	* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
9d1ee8ce RW	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.
1da177e4 LT	8	*/
1da177e4 LT	9
c5d4bb17 JD	10	#include <linux/kallsyms.h>
	11	#include <linux/kernel.h>
	12	#include <linux/module.h>
	13	#include <linux/sched.h>
382d95fd	14	#include <asm/sysrq.h>
f72c22e4	15	#include <os.h>
1da177e4	16
9d1ee8ce RW	17	struct stack_frame {
	18	struct stack_frame *next_frame;
	19	unsigned long return_address;
	20	};
	21
	22	static void print_stack_trace(unsigned long *sp, unsigned long bp)
1da177e4	23	{
9d1ee8ce	24	int reliable;
c5d4bb17	25	unsigned long addr;
9d1ee8ce	26	struct stack_frame frame = (struct stack_frame )bp;
1da177e4	27
9d1ee8ce RW	28	printk(KERN_INFO "Call Trace:\n");
	29	while (((long) sp & (THREAD_SIZE-1)) != 0) {
	30	addr = *sp;
1da177e4	31	if (__kernel_text_address(addr)) {
9d1ee8ce RW	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);
c5d4bb17 JD	42	printk(KERN_CONT "\n");
c5d4bb17 JD	43	}
9d1ee8ce	44	sp++;
c5d4bb17 JD	45	}
c5d4bb17 JD	46	printk(KERN_INFO "\n");
1da177e4 LT	47	}
1da177e4 LT	48
1da177e4	49	/Stolen from arch/i386/kernel/traps.c /
0d0d0ed4	50	static const int kstack_depth_to_print = 24;
1da177e4	51
f72c22e4 RW	52	static unsigned long get_frame_pointer(struct task_struct *task,
f72c22e4 RW	53	struct pt_regs *segv_regs)
9d1ee8ce RW	54	{
9d1ee8ce RW	55	if (!task \|\| task == current)
f72c22e4	56	return segv_regs ? PT_REGS_BP(segv_regs) : current_bp();
9d1ee8ce RW	57	else
	58	return KSTK_EBP(task);
	59	}
	60
f72c22e4 RW	61	static unsigned long get_stack_pointer(struct task_struct task,
	62	struct pt_regs *segv_regs)
	63	{
	64	if (!task \|\| task == current)
	65	return segv_regs ? (unsigned long *)PT_REGS_SP(segv_regs) : current_sp();
	66	else
	67	return (unsigned long *)KSTK_ESP(task);
	68	}
	69
9d1ee8ce	70	void show_stack(struct task_struct task, unsigned long stack)
1da177e4	71	{
9d1ee8ce	72	unsigned long *sp = stack, bp = 0;
f72c22e4	73	struct pt_regs *segv_regs = current->thread.segv_regs;
1da177e4 LT	74	int i;
1da177e4 LT	75
f72c22e4 RW	76	if (!segv_regs && os_is_signal_stack()) {
	77	printk(KERN_ERR "Received SIGSEGV in SIGSEGV handler,"
	78	" aborting stack trace!\n");
	79	return;
	80	}
	81
9d1ee8ce	82	#ifdef CONFIG_FRAME_POINTER
f72c22e4	83	bp = get_frame_pointer(task, segv_regs);
9d1ee8ce RW	84	#endif
9d1ee8ce RW	85
f72c22e4 RW	86	if (!stack)
f72c22e4 RW	87	sp = get_stack_pointer(task, segv_regs);
1da177e4	88
9d1ee8ce RW	89	printk(KERN_INFO "Stack:\n");
9d1ee8ce RW	90	stack = sp;
c5d4bb17	91	for (i = 0; i < kstack_depth_to_print; i++) {
1da177e4 LT	92	if (kstack_end(stack))
1da177e4 LT	93	break;
9d1ee8ce RW	94	if (i && ((i % STACKSLOTS_PER_LINE) == 0))
	95	printk(KERN_CONT "\n");
	96	printk(KERN_CONT " %08lx", *stack++);
1da177e4	97	}
9d1ee8ce	98	printk(KERN_CONT "\n");
1da177e4	99
9d1ee8ce	100	print_stack_trace(sp, bp);
1da177e4	101	}