1 /* SPDX-License-Identifier: GPL-2.0 */ <<
2 /* 1 /*
3 * Copyright (C) 2000 Anton Blanchard (anton@l 2 * Copyright (C) 2000 Anton Blanchard (anton@linuxcare.com)
4 * 3 *
5 * This file implements mcount(), which is use 4 * This file implements mcount(), which is used to collect profiling data.
6 * This can also be tweaked for kernel stack o 5 * This can also be tweaked for kernel stack overflow detection.
7 */ 6 */
8 7
9 #include <linux/export.h> <<
10 #include <linux/linkage.h> 8 #include <linux/linkage.h>
>> 9 #include <asm/export.h>
11 10
12 /* 11 /*
13 * This is the main variant and is called by C 12 * This is the main variant and is called by C code. GCC's -pg option
14 * automatically instruments every C function 13 * automatically instruments every C function with a call to this.
15 */ 14 */
16 15
17 .text 16 .text
18 .align 32 17 .align 32
19 .globl _mcount 18 .globl _mcount
20 .type _mcount,#function 19 .type _mcount,#function
21 EXPORT_SYMBOL(_mcount) 20 EXPORT_SYMBOL(_mcount)
22 .globl mcount 21 .globl mcount
23 .type mcount,#function 22 .type mcount,#function
24 _mcount: 23 _mcount:
25 mcount: 24 mcount:
26 #ifdef CONFIG_FUNCTION_TRACER 25 #ifdef CONFIG_FUNCTION_TRACER
27 #ifdef CONFIG_DYNAMIC_FTRACE 26 #ifdef CONFIG_DYNAMIC_FTRACE
28 /* Do nothing, the retl/nop below is a 27 /* Do nothing, the retl/nop below is all we need. */
29 #else 28 #else
30 sethi %hi(ftrace_trace_funct 29 sethi %hi(ftrace_trace_function), %g1
31 sethi %hi(ftrace_stub), %g2 30 sethi %hi(ftrace_stub), %g2
32 ldx [%g1 + %lo(ftrace_trac 31 ldx [%g1 + %lo(ftrace_trace_function)], %g1
33 or %g2, %lo(ftrace_stub), 32 or %g2, %lo(ftrace_stub), %g2
34 cmp %g1, %g2 33 cmp %g1, %g2
35 be,pn %icc, 1f 34 be,pn %icc, 1f
36 mov %i7, %g3 35 mov %i7, %g3
37 save %sp, -176, %sp 36 save %sp, -176, %sp
38 mov %g3, %o1 37 mov %g3, %o1
39 jmpl %g1, %o7 38 jmpl %g1, %o7
40 mov %i7, %o0 39 mov %i7, %o0
41 ret 40 ret
42 restore 41 restore
43 /* not reached */ 42 /* not reached */
44 1: 43 1:
45 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 44 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
46 sethi %hi(ftrace_graph_retur 45 sethi %hi(ftrace_graph_return), %g1
47 ldx [%g1 + %lo(ftrace_grap 46 ldx [%g1 + %lo(ftrace_graph_return)], %g3
48 cmp %g2, %g3 47 cmp %g2, %g3
49 bne,pn %xcc, 5f 48 bne,pn %xcc, 5f
50 sethi %hi(ftrace_graph_entry 49 sethi %hi(ftrace_graph_entry_stub), %g2
51 sethi %hi(ftrace_graph_entry 50 sethi %hi(ftrace_graph_entry), %g1
52 or %g2, %lo(ftrace_graph_ 51 or %g2, %lo(ftrace_graph_entry_stub), %g2
53 ldx [%g1 + %lo(ftrace_grap 52 ldx [%g1 + %lo(ftrace_graph_entry)], %g1
54 cmp %g1, %g2 53 cmp %g1, %g2
55 be,pt %xcc, 2f 54 be,pt %xcc, 2f
56 nop 55 nop
57 5: mov %i7, %g2 56 5: mov %i7, %g2
58 mov %fp, %g3 57 mov %fp, %g3
59 save %sp, -176, %sp 58 save %sp, -176, %sp
60 mov %g2, %l0 59 mov %g2, %l0
61 ba,pt %xcc, ftrace_graph_cal 60 ba,pt %xcc, ftrace_graph_caller
62 mov %g3, %l1 61 mov %g3, %l1
63 #endif 62 #endif
64 2: 63 2:
65 #endif 64 #endif
66 #endif 65 #endif
67 retl 66 retl
68 nop 67 nop
69 .size _mcount,.-_mcount 68 .size _mcount,.-_mcount
70 .size mcount,.-mcount 69 .size mcount,.-mcount
71 70
72 #ifdef CONFIG_FUNCTION_TRACER 71 #ifdef CONFIG_FUNCTION_TRACER
73 .globl ftrace_stub 72 .globl ftrace_stub
74 .type ftrace_stub,#function 73 .type ftrace_stub,#function
75 ftrace_stub: 74 ftrace_stub:
76 retl 75 retl
77 nop 76 nop
78 .size ftrace_stub,.-ftrace_s 77 .size ftrace_stub,.-ftrace_stub
79 #ifdef CONFIG_DYNAMIC_FTRACE 78 #ifdef CONFIG_DYNAMIC_FTRACE
80 .globl ftrace_caller 79 .globl ftrace_caller
81 .type ftrace_caller,#functio 80 .type ftrace_caller,#function
82 ftrace_caller: 81 ftrace_caller:
83 mov %i7, %g2 82 mov %i7, %g2
84 mov %fp, %g3 83 mov %fp, %g3
85 save %sp, -176, %sp 84 save %sp, -176, %sp
86 mov %g2, %o1 85 mov %g2, %o1
87 mov %g2, %l0 86 mov %g2, %l0
88 mov %g3, %l1 87 mov %g3, %l1
89 .globl ftrace_call 88 .globl ftrace_call
90 ftrace_call: 89 ftrace_call:
91 call ftrace_stub 90 call ftrace_stub
92 mov %i7, %o0 91 mov %i7, %o0
93 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 92 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
94 .globl ftrace_graph_call 93 .globl ftrace_graph_call
95 ftrace_graph_call: 94 ftrace_graph_call:
96 call ftrace_stub 95 call ftrace_stub
97 nop 96 nop
98 #endif 97 #endif
99 ret 98 ret
100 restore 99 restore
101 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 100 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
102 .size ftrace_graph_call,.-ft 101 .size ftrace_graph_call,.-ftrace_graph_call
103 #endif 102 #endif
104 .size ftrace_call,.-ftrace_c 103 .size ftrace_call,.-ftrace_call
105 .size ftrace_caller,.-ftrace 104 .size ftrace_caller,.-ftrace_caller
106 #endif 105 #endif
107 #endif 106 #endif
108 107
109 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 108 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
110 ENTRY(ftrace_graph_caller) 109 ENTRY(ftrace_graph_caller)
111 mov %l0, %o0 110 mov %l0, %o0
112 mov %i7, %o1 111 mov %i7, %o1
113 call prepare_ftrace_return 112 call prepare_ftrace_return
114 mov %l1, %o2 113 mov %l1, %o2
115 ret 114 ret
116 restore %o0, -8, %i7 115 restore %o0, -8, %i7
117 END(ftrace_graph_caller) 116 END(ftrace_graph_caller)
118 117
119 ENTRY(return_to_handler) 118 ENTRY(return_to_handler)
120 save %sp, -176, %sp 119 save %sp, -176, %sp
121 call ftrace_return_to_handl 120 call ftrace_return_to_handler
122 mov %fp, %o0 121 mov %fp, %o0
123 jmpl %o0 + 8, %g0 122 jmpl %o0 + 8, %g0
124 restore 123 restore
125 END(return_to_handler) 124 END(return_to_handler)
126 #endif 125 #endif
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