Commit | Line | Data |
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d2bb0762 WZ |
1 | /* |
2 | * MIPS specific _mcount support | |
3 | * | |
4 | * This file is subject to the terms and conditions of the GNU General Public | |
5 | * License. See the file "COPYING" in the main directory of this archive for | |
6 | * more details. | |
7 | * | |
8 | * Copyright (C) 2009 Lemote Inc. & DSLab, Lanzhou University, China | |
042e571d | 9 | * Copyright (C) 2010 DSLab, Lanzhou University, China |
f7a904df | 10 | * Author: Wu Zhangjin <wuzhangjin@gmail.com> |
d2bb0762 WZ |
11 | */ |
12 | ||
13 | #include <asm/regdef.h> | |
14 | #include <asm/stackframe.h> | |
15 | #include <asm/ftrace.h> | |
16 | ||
17 | .text | |
18 | .set noreorder | |
19 | .set noat | |
20 | ||
21 | .macro MCOUNT_SAVE_REGS | |
22 | PTR_SUBU sp, PT_SIZE | |
23 | PTR_S ra, PT_R31(sp) | |
24 | PTR_S AT, PT_R1(sp) | |
25 | PTR_S a0, PT_R4(sp) | |
26 | PTR_S a1, PT_R5(sp) | |
27 | PTR_S a2, PT_R6(sp) | |
28 | PTR_S a3, PT_R7(sp) | |
29 | #ifdef CONFIG_64BIT | |
30 | PTR_S a4, PT_R8(sp) | |
31 | PTR_S a5, PT_R9(sp) | |
32 | PTR_S a6, PT_R10(sp) | |
33 | PTR_S a7, PT_R11(sp) | |
34 | #endif | |
35 | .endm | |
36 | ||
37 | .macro MCOUNT_RESTORE_REGS | |
38 | PTR_L ra, PT_R31(sp) | |
39 | PTR_L AT, PT_R1(sp) | |
40 | PTR_L a0, PT_R4(sp) | |
41 | PTR_L a1, PT_R5(sp) | |
42 | PTR_L a2, PT_R6(sp) | |
43 | PTR_L a3, PT_R7(sp) | |
44 | #ifdef CONFIG_64BIT | |
45 | PTR_L a4, PT_R8(sp) | |
46 | PTR_L a5, PT_R9(sp) | |
47 | PTR_L a6, PT_R10(sp) | |
48 | PTR_L a7, PT_R11(sp) | |
d2bb0762 | 49 | #endif |
ad8c3969 DD |
50 | PTR_ADDIU sp, PT_SIZE |
51 | .endm | |
d2bb0762 WZ |
52 | |
53 | .macro RETURN_BACK | |
54 | jr ra | |
55 | move ra, AT | |
56 | .endm | |
57 | ||
56b49cd3 WZ |
58 | /* |
59 | * The -mmcount-ra-address option of gcc 4.5 uses register $12 to pass | |
60 | * the location of the parent's return address. | |
61 | */ | |
62 | #define MCOUNT_RA_ADDRESS_REG $12 | |
63 | ||
538f1952 WZ |
64 | #ifdef CONFIG_DYNAMIC_FTRACE |
65 | ||
66 | NESTED(ftrace_caller, PT_SIZE, ra) | |
67 | .globl _mcount | |
68 | _mcount: | |
69 | b ftrace_stub | |
ad8c3969 DD |
70 | #ifdef CONFIG_32BIT |
71 | addiu sp,sp,8 | |
72 | #else | |
73 | nop | |
74 | #endif | |
58b69401 AC |
75 | |
76 | /* When tracing is activated, it calls ftrace_caller+8 (aka here) */ | |
538f1952 | 77 | MCOUNT_SAVE_REGS |
7326c4e5 | 78 | #ifdef KBUILD_MCOUNT_RA_ADDRESS |
56b49cd3 | 79 | PTR_S MCOUNT_RA_ADDRESS_REG, PT_R12(sp) |
7326c4e5 | 80 | #endif |
538f1952 | 81 | |
05f22639 | 82 | PTR_SUBU a0, ra, 8 /* arg1: self address */ |
dce0e7d5 PG |
83 | PTR_LA t1, _stext |
84 | sltu t2, a0, t1 /* t2 = (a0 < _stext) */ | |
85 | PTR_LA t1, _etext | |
86 | sltu t3, t1, a0 /* t3 = (a0 > _etext) */ | |
87 | or t1, t2, t3 | |
88 | beqz t1, ftrace_call | |
89 | nop | |
90 | #if defined(KBUILD_MCOUNT_RA_ADDRESS) && defined(CONFIG_32BIT) | |
91 | PTR_SUBU a0, a0, 16 /* arg1: adjust to module's recorded callsite */ | |
92 | #else | |
93 | PTR_SUBU a0, a0, 12 | |
94 | #endif | |
95 | ||
538f1952 WZ |
96 | .globl ftrace_call |
97 | ftrace_call: | |
98 | nop /* a placeholder for the call to a real tracing function */ | |
042e571d | 99 | move a1, AT /* arg2: parent's return address */ |
538f1952 | 100 | |
e17ff5fe WZ |
101 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
102 | .globl ftrace_graph_call | |
103 | ftrace_graph_call: | |
104 | nop | |
105 | nop | |
106 | #endif | |
107 | ||
538f1952 WZ |
108 | MCOUNT_RESTORE_REGS |
109 | .globl ftrace_stub | |
110 | ftrace_stub: | |
111 | RETURN_BACK | |
112 | END(ftrace_caller) | |
113 | ||
114 | #else /* ! CONFIG_DYNAMIC_FTRACE */ | |
115 | ||
d2bb0762 | 116 | NESTED(_mcount, PT_SIZE, ra) |
fc49a3be WZ |
117 | PTR_LA t1, ftrace_stub |
118 | PTR_L t2, ftrace_trace_function /* Prepare t2 for (1) */ | |
119 | bne t1, t2, static_trace | |
d2bb0762 | 120 | nop |
29c5d346 WZ |
121 | |
122 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
fc49a3be WZ |
123 | PTR_L t3, ftrace_graph_return |
124 | bne t1, t3, ftrace_graph_caller | |
29c5d346 | 125 | nop |
fc49a3be WZ |
126 | PTR_LA t1, ftrace_graph_entry_stub |
127 | PTR_L t3, ftrace_graph_entry | |
128 | bne t1, t3, ftrace_graph_caller | |
29c5d346 WZ |
129 | nop |
130 | #endif | |
d2bb0762 | 131 | b ftrace_stub |
8a574cfa MC |
132 | #ifdef CONFIG_32BIT |
133 | addiu sp, sp, 8 | |
134 | #else | |
d2bb0762 | 135 | nop |
8a574cfa | 136 | #endif |
d2bb0762 WZ |
137 | |
138 | static_trace: | |
139 | MCOUNT_SAVE_REGS | |
140 | ||
042e571d | 141 | move a0, ra /* arg1: self return address */ |
fc49a3be | 142 | jalr t2 /* (1) call *ftrace_trace_function */ |
042e571d | 143 | move a1, AT /* arg2: parent's return address */ |
d2bb0762 WZ |
144 | |
145 | MCOUNT_RESTORE_REGS | |
8a574cfa MC |
146 | #ifdef CONFIG_32BIT |
147 | addiu sp, sp, 8 | |
148 | #endif | |
d2bb0762 WZ |
149 | .globl ftrace_stub |
150 | ftrace_stub: | |
151 | RETURN_BACK | |
152 | END(_mcount) | |
153 | ||
538f1952 WZ |
154 | #endif /* ! CONFIG_DYNAMIC_FTRACE */ |
155 | ||
29c5d346 WZ |
156 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
157 | ||
158 | NESTED(ftrace_graph_caller, PT_SIZE, ra) | |
cbe555b0 | 159 | #ifndef CONFIG_DYNAMIC_FTRACE |
29c5d346 | 160 | MCOUNT_SAVE_REGS |
e17ff5fe | 161 | #endif |
7326c4e5 | 162 | |
cbe555b0 | 163 | /* arg1: Get the location of the parent's return address */ |
7326c4e5 | 164 | #ifdef KBUILD_MCOUNT_RA_ADDRESS |
cbe555b0 WZ |
165 | #ifdef CONFIG_DYNAMIC_FTRACE |
166 | PTR_L a0, PT_R12(sp) | |
167 | #else | |
56b49cd3 | 168 | move a0, MCOUNT_RA_ADDRESS_REG |
cbe555b0 | 169 | #endif |
56b49cd3 | 170 | bnez a0, 1f /* non-leaf func: stored in MCOUNT_RA_ADDRESS_REG */ |
7326c4e5 | 171 | nop |
cbe555b0 WZ |
172 | #endif |
173 | PTR_LA a0, PT_R1(sp) /* leaf func: the location in current stack */ | |
174 | 1: | |
175 | ||
176 | /* arg2: Get self return address */ | |
177 | #ifdef CONFIG_DYNAMIC_FTRACE | |
178 | PTR_L a1, PT_R31(sp) | |
7326c4e5 | 179 | #else |
cbe555b0 | 180 | move a1, ra |
7326c4e5 | 181 | #endif |
cbe555b0 WZ |
182 | |
183 | /* arg3: Get frame pointer of current stack */ | |
046199ca | 184 | #ifdef CONFIG_64BIT |
65ab2826 | 185 | PTR_LA a2, PT_SIZE(sp) |
046199ca | 186 | #else |
65ab2826 | 187 | PTR_LA a2, (PT_SIZE+8)(sp) |
046199ca | 188 | #endif |
29c5d346 | 189 | |
cbe555b0 WZ |
190 | jal prepare_ftrace_return |
191 | nop | |
29c5d346 | 192 | MCOUNT_RESTORE_REGS |
8a574cfa MC |
193 | #ifndef CONFIG_DYNAMIC_FTRACE |
194 | #ifdef CONFIG_32BIT | |
195 | addiu sp, sp, 8 | |
196 | #endif | |
197 | #endif | |
29c5d346 WZ |
198 | RETURN_BACK |
199 | END(ftrace_graph_caller) | |
200 | ||
201 | .align 2 | |
202 | .globl return_to_handler | |
203 | return_to_handler: | |
204 | PTR_SUBU sp, PT_SIZE | |
205 | PTR_S v0, PT_R2(sp) | |
206 | ||
207 | jal ftrace_return_to_handler | |
208 | PTR_S v1, PT_R3(sp) | |
209 | ||
210 | /* restore the real parent address: v0 -> ra */ | |
211 | move ra, v0 | |
212 | ||
213 | PTR_L v0, PT_R2(sp) | |
214 | PTR_L v1, PT_R3(sp) | |
215 | jr ra | |
216 | PTR_ADDIU sp, PT_SIZE | |
217 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ | |
218 | ||
d2bb0762 WZ |
219 | .set at |
220 | .set reorder |