summaryrefslogtreecommitdiffstats
path: root/arch/s390/kernel/mcount.S
blob: 0aa85ec94d0821ea8ff43e990063d6ec9f423590 (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
/*
 * 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

#ifdef CONFIG_64BIT

#ifdef CONFIG_DYNAMIC_FTRACE

	.globl _mcount
_mcount:
	br	%r14

	.globl ftrace_caller
ftrace_caller:
	larl	%r1,function_trace_stop
	icm	%r1,0xf,0(%r1)
	bnzr	%r14
	stmg	%r2,%r5,32(%r15)
	stg	%r14,112(%r15)
	lgr	%r1,%r15
	aghi	%r15,-160
	stg	%r1,__SF_BACKCHAIN(%r15)
	lgr	%r2,%r14
	lg	%r3,168(%r15)
	larl	%r14,ftrace_dyn_func
	lg	%r14,0(%r14)
	basr	%r14,%r14
	aghi	%r15,160
	lmg	%r2,%r5,32(%r15)
	lg	%r14,112(%r15)
	br	%r14

	.data
	.globl	ftrace_dyn_func
ftrace_dyn_func:
	.quad	ftrace_stub
	.previous

#else /* CONFIG_DYNAMIC_FTRACE */

	.globl _mcount
_mcount:
	larl	%r1,function_trace_stop
	icm	%r1,0xf,0(%r1)
	bnzr	%r14
	stmg	%r2,%r5,32(%r15)
	stg	%r14,112(%r15)
	lgr	%r1,%r15
	aghi	%r15,-160
	stg	%r1,__SF_BACKCHAIN(%r15)
	lgr	%r2,%r14
	lg	%r3,168(%r15)
	larl	%r14,ftrace_trace_function
	lg	%r14,0(%r14)
	basr	%r14,%r14
	aghi	%r15,160
	lmg	%r2,%r5,32(%r15)
	lg	%r14,112(%r15)
	br	%r14

#endif /* CONFIG_DYNAMIC_FTRACE */

#else /* CONFIG_64BIT */

#ifdef CONFIG_DYNAMIC_FTRACE

	.globl _mcount
_mcount:
	br	%r14

	.globl ftrace_caller
ftrace_caller:
	stm	%r2,%r5,16(%r15)
	bras	%r1,2f
0:	.long	ftrace_trace_function
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
	ahi	%r15,96
	l	%r14,56(%r15)
3:	lm	%r2,%r5,16(%r15)
	br	%r14

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

#else /* CONFIG_DYNAMIC_FTRACE */

	.globl _mcount
_mcount:
	stm	%r2,%r5,16(%r15)
	bras	%r1,2f
0:	.long	ftrace_trace_function
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
	ahi	%r15,96
	l	%r14,56(%r15)
3:	lm	%r2,%r5,16(%r15)
	br	%r14

#endif /* CONFIG_DYNAMIC_FTRACE */
#endif /* CONFIG_64BIT */