aboutsummaryrefslogtreecommitdiffstats
path: root/arch/s390/kernel/mcount.S
blob: dfe015d7398c9e900f13810eb9b6bab6e52ca4f2 (plain) (blame)
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
/*
 * Copyright IBM Corp. 2008,2009
 *
 *   Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
 *
 */

#include <asm/asm-offsets.h>

	.globl ftrace_stub
ftrace_stub:
	br	%r14

	.globl _mcount
_mcount:
#ifdef CONFIG_DYNAMIC_FTRACE
	br	%r14

	.data
	.globl	ftrace_dyn_func
ftrace_dyn_func:
	.long	ftrace_stub
	.previous

	.globl ftrace_caller
ftrace_caller:
#endif
	stm	%r2,%r5,16(%r15)
	bras	%r1,2f
#ifdef CONFIG_DYNAMIC_FTRACE
0:	.long	ftrace_dyn_func
#else
0:	.long	ftrace_trace_function
#endif
1:	.long	function_trace_stop
2:	l	%r2,1b-0b(%r1)
	icm	%r2,0xf,0(%r2)
	jnz	3f
	st	%r14,56(%r15)
	lr	%r0,%r15
	ahi	%r15,-96
	l	%r3,100(%r15)
	la	%r2,0(%r14)
	st	%r0,__SF_BACKCHAIN(%r15)
	la	%r3,0(%r3)
	l	%r14,0b-0b(%r1)
	l	%r14,0(%r14)
	basr	%r14,%r14
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
#ifdef CONFIG_DYNAMIC_FTRACE
	.globl	ftrace_graph_caller
ftrace_graph_caller:
	# This unconditional branch gets runtime patched. Change only if
	# you know what you are doing. See ftrace_enable_graph_caller().
	j	1f
#endif
	bras	%r1,0f
	.long	prepare_ftrace_return
0:	l	%r2,152(%r15)
	l	%r4,0(%r1)
	l	%r3,100(%r15)
	basr	%r14,%r4
	st	%r2,100(%r15)
1:
#endif
	ahi	%r15,96
	l	%r14,56(%r15)
3:	lm	%r2,%r5,16(%r15)
	br	%r14

#ifdef CONFIG_FUNCTION_GRAPH_TRACER

	.globl	return_to_handler
return_to_handler:
	stm	%r2,%r5,16(%r15)
	st	%r14,56(%r15)
	lr	%r0,%r15
	ahi	%r15,-96
	st	%r0,__SF_BACKCHAIN(%r15)
	bras	%r1,0f
	.long	ftrace_return_to_handler
0:	l	%r2,0b-0b(%r1)
	basr	%r14,%r2
	lr	%r14,%r2
	ahi	%r15,96
	lm	%r2,%r5,16(%r15)
	br	%r14

#endif