summaryrefslogtreecommitdiffstats
path: root/arch/arm/oprofile/backtrace.c
blob: df35c452a8bf6528c3cf92ee892af205350d7b50 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
/*
 * Arm specific backtracing code for oprofile
 *
 * Copyright 2005 Openedhand Ltd.
 *
 * Author: Richard Purdie <rpurdie@openedhand.com>
 *
 * Based on i386 oprofile backtrace code by John Levon, David Smith
 *
 * 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/oprofile.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <asm/ptrace.h>
#include <asm/uaccess.h>


/*
 * The registers we're interested in are at the end of the variable
 * length saved register structure. The fp points at the end of this
 * structure so the address of this struct is:
 * (struct frame_tail *)(xxx->fp)-1
 */
struct frame_tail {
	struct frame_tail *fp;
	unsigned long sp;
	unsigned long lr;
} __attribute__((packed));


#ifdef CONFIG_FRAME_POINTER
static struct frame_tail* kernel_backtrace(struct frame_tail *tail)
{
	oprofile_add_trace(tail->lr);

	/* frame pointers should strictly progress back up the stack
	 * (towards higher addresses) */
	if (tail >= tail->fp)
		return NULL;

	return tail->fp-1;
}
#endif

static struct frame_tail* user_backtrace(struct frame_tail *tail)
{
	struct frame_tail buftail;

	/* hardware pte might not be valid due to dirty/accessed bit emulation
	 * so we use copy_from_user and benefit from exception fixups */
	if (copy_from_user(&buftail, tail, sizeof(struct frame_tail)))
		return NULL;

	oprofile_add_trace(buftail.lr);

	/* frame pointers should strictly progress back up the stack
	 * (towards higher addresses) */
	if (tail >= buftail.fp)
		return NULL;

	return buftail.fp-1;
}

/* Compare two addresses and see if they're on the same page */
#define CMP_ADDR_EQUAL(x,y,offset) ((((unsigned long) x) >> PAGE_SHIFT) \
	== ((((unsigned long) y) + offset) >> PAGE_SHIFT))

/* check that the page(s) containing the frame tail are present */
static int pages_present(struct frame_tail *tail)
{
	struct mm_struct * mm = current->mm;

	if (!check_user_page_readable(mm, (unsigned long)tail))
		return 0;

	if (CMP_ADDR_EQUAL(tail, tail, 8))
		return 1;

	if (!check_user_page_readable(mm, ((unsigned long)tail) + 8))
		return 0;

	return 1;
}

/*
 * |             | /\ Higher addresses
 * |             |
 * --------------- stack base (address of current_thread_info)
 * | thread info |
 * .             .
 * |    stack    |
 * --------------- saved regs->ARM_fp value if valid (frame_tail address)
 * .             .
 * --------------- struct pt_regs stored on stack (struct pt_regs *)
 * |             |
 * .             .
 * |             |
 * --------------- %esp
 * |             |
 * |             | \/ Lower addresses
 *
 * Thus, &pt_regs <-> stack base restricts the valid(ish) fp values
 */
static int valid_kernel_stack(struct frame_tail *tail, struct pt_regs *regs)
{
	unsigned long tailaddr = (unsigned long)tail;
	unsigned long stack = (unsigned long)regs;
	unsigned long stack_base = (stack & ~(THREAD_SIZE - 1)) + THREAD_SIZE;

	return (tailaddr > stack) && (tailaddr < stack_base);
}

void arm_backtrace(struct pt_regs * const regs, unsigned int depth)
{
	struct frame_tail *tail;
	unsigned long last_address = 0;

	tail = ((struct frame_tail *) regs->ARM_fp) - 1;

	if (!user_mode(regs)) {

#ifdef CONFIG_FRAME_POINTER
		while (depth-- && tail && valid_kernel_stack(tail, regs)) {
			tail = kernel_backtrace(tail);
		}
#endif
		return;
	}

	while (depth-- && tail && !((unsigned long) tail & 3)) {
		if ((!CMP_ADDR_EQUAL(last_address, tail, 0)
			|| !CMP_ADDR_EQUAL(last_address, tail, 8))
				&& !pages_present(tail))
			return;
		last_address = (unsigned long) tail;
		tail = user_backtrace(tail);
	}
}

OpenPOWER on IntegriCloud