Release 4.14 arch/x86/oprofile/backtrace.c

/**
 * @file backtrace.c
 *
 * @remark Copyright 2002 OProfile authors
 * @remark Read the file COPYING
 *
 * @author John Levon
 * @author David Smith
 */

#include <linux/oprofile.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/compat.h>
#include <linux/uaccess.h>

#include <asm/ptrace.h>
#include <asm/stacktrace.h>
#include <asm/unwind.h>

#ifdef CONFIG_COMPAT

static struct stack_frame_ia32 *

dump_user_backtrace_32(struct stack_frame_ia32 *head)
{
	/* Also check accessibility of one struct frame_head beyond: */
	struct stack_frame_ia32 bufhead[2];
	struct stack_frame_ia32 *fp;
	unsigned long bytes;

	bytes = copy_from_user_nmi(bufhead, head, sizeof(bufhead));
	if (bytes != 0)
		return NULL;

	fp = (struct stack_frame_ia32 *) compat_ptr(bufhead[0].next_frame);

	oprofile_add_trace(bufhead[0].return_address);

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

	return fp;
}

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Jiri Olsa
80
86.02%
1
33.33%
Robert Richter
12
12.90%
1
33.33%
Peter Zijlstra
1
1.08%
1
33.33%
Total
93
100.00%
3
100.00%


static inline int

x86_backtrace_32(struct pt_regs * const regs, unsigned int depth)
{
	struct stack_frame_ia32 *head;

	/* User process is IA32 */
	if (!current || !test_thread_flag(TIF_IA32))
		return 0;

	head = (struct stack_frame_ia32 *) regs->bp;
	while (depth-- && head)
		head = dump_user_backtrace_32(head);

	return 1;
}

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Jiri Olsa
64
98.46%
1
50.00%
H. Peter Anvin
1
1.54%
1
50.00%
Total
65
100.00%
2
100.00%

#else

static inline int

x86_backtrace_32(struct pt_regs * const regs, unsigned int depth)
{
	return 0;
}
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Jiri Olsa
20
100.00%
1
100.00%
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20
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1
100.00%

#endif /* CONFIG_COMPAT */



static struct stack_frame *dump_user_backtrace(struct stack_frame *head)
{
	/* Also check accessibility of one struct frame_head beyond: */
	struct stack_frame bufhead[2];
	unsigned long bytes;

	bytes = copy_from_user_nmi(bufhead, head, sizeof(bufhead));
	if (bytes != 0)
		return NULL;

	oprofile_add_trace(bufhead[0].return_address);

	/* frame pointers should strictly progress back up the stack
         * (towards higher addresses) */
	if (head >= bufhead[0].next_frame)
		return NULL;

	return bufhead[0].next_frame;
}

Contributors
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Hugh Dickins
43
53.09%
1
16.67%
Greg Banks
18
22.22%
1
16.67%
Robert Richter
12
14.81%
1
16.67%
Jiri Olsa
6
7.41%
1
16.67%
Peter Zijlstra
1
1.23%
1
16.67%
Gerald Britton
1
1.23%
1
16.67%
Total
81
100.00%
6
100.00%


void

x86_backtrace(struct pt_regs * const regs, unsigned int depth)
{
	struct stack_frame *head = (struct stack_frame *)frame_pointer(regs);

	if (!user_mode(regs)) {
		struct unwind_state state;
		unsigned long addr;

		if (!depth)
			return;

		oprofile_add_trace(regs->ip);

		if (!--depth)
			return;

		for (unwind_start(&state, current, regs, NULL);
		     !unwind_done(&state); unwind_next_frame(&state)) {
			addr = unwind_get_return_address(&state);
			if (!addr)
				break;

			oprofile_add_trace(addr);

			if (!--depth)
				break;
		}

		return;
	}

	if (x86_backtrace_32(regs, depth))
		return;

	while (depth-- && head)
		head = dump_user_backtrace(head);
}
Contributors
Person
Tokens
Prop
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CommitProp
Josh Poimboeuf
71
47.97%
3
30.00%
Greg Banks
53
35.81%
1
10.00%
Jiri Olsa
12
8.11%
2
20.00%
Jan Blunck
10
6.76%
2
20.00%
Andrew Lutomirski
1
0.68%
1
10.00%
Gerald Britton
1
0.68%
1
10.00%
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148
100.00%
10
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Jiri Olsa
192
43.64%
2
13.33%
Greg Banks
83
18.86%
1
6.67%
Josh Poimboeuf
74
16.82%
3
20.00%
Hugh Dickins
45
10.23%
1
6.67%
Robert Richter
28
6.36%
2
13.33%
Jan Blunck
12
2.73%
2
13.33%
Peter Zijlstra
2
0.45%
1
6.67%
Gerald Britton
2
0.45%
1
6.67%
Andrew Lutomirski
1
0.23%
1
6.67%
H. Peter Anvin
1
0.23%
1
6.67%
Total
440
100.00%
15
100.00%
Directory: arch/x86/oprofile

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