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) */ | |
fc49a3be WZ |
77 | lw t1, function_trace_stop |
78 | bnez t1, ftrace_stub | |
538f1952 WZ |
79 | nop |
80 | ||
81 | MCOUNT_SAVE_REGS | |
7326c4e5 | 82 | #ifdef KBUILD_MCOUNT_RA_ADDRESS |
56b49cd3 | 83 | PTR_S MCOUNT_RA_ADDRESS_REG, PT_R12(sp) |
7326c4e5 | 84 | #endif |
538f1952 | 85 | |
042e571d | 86 | move a0, ra /* arg1: self return address */ |
538f1952 WZ |
87 | .globl ftrace_call |
88 | ftrace_call: | |
89 | nop /* a placeholder for the call to a real tracing function */ | |
042e571d | 90 | move a1, AT /* arg2: parent's return address */ |
538f1952 | 91 | |
e17ff5fe WZ |
92 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
93 | .globl ftrace_graph_call | |
94 | ftrace_graph_call: | |
95 | nop | |
96 | nop | |
97 | #endif | |
98 | ||
538f1952 WZ |
99 | MCOUNT_RESTORE_REGS |
100 | .globl ftrace_stub | |
101 | ftrace_stub: | |
102 | RETURN_BACK | |
103 | END(ftrace_caller) | |
104 | ||
105 | #else /* ! CONFIG_DYNAMIC_FTRACE */ | |
106 | ||
d2bb0762 | 107 | NESTED(_mcount, PT_SIZE, ra) |
fc49a3be WZ |
108 | lw t1, function_trace_stop |
109 | bnez t1, ftrace_stub | |
69a7d1b3 | 110 | nop |
fc49a3be WZ |
111 | PTR_LA t1, ftrace_stub |
112 | PTR_L t2, ftrace_trace_function /* Prepare t2 for (1) */ | |
113 | bne t1, t2, static_trace | |
d2bb0762 | 114 | nop |
29c5d346 WZ |
115 | |
116 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
fc49a3be WZ |
117 | PTR_L t3, ftrace_graph_return |
118 | bne t1, t3, ftrace_graph_caller | |
29c5d346 | 119 | nop |
fc49a3be WZ |
120 | PTR_LA t1, ftrace_graph_entry_stub |
121 | PTR_L t3, ftrace_graph_entry | |
122 | bne t1, t3, ftrace_graph_caller | |
29c5d346 WZ |
123 | nop |
124 | #endif | |
d2bb0762 WZ |
125 | b ftrace_stub |
126 | nop | |
127 | ||
128 | static_trace: | |
129 | MCOUNT_SAVE_REGS | |
130 | ||
042e571d | 131 | move a0, ra /* arg1: self return address */ |
fc49a3be | 132 | jalr t2 /* (1) call *ftrace_trace_function */ |
042e571d | 133 | move a1, AT /* arg2: parent's return address */ |
d2bb0762 WZ |
134 | |
135 | MCOUNT_RESTORE_REGS | |
136 | .globl ftrace_stub | |
137 | ftrace_stub: | |
138 | RETURN_BACK | |
139 | END(_mcount) | |
140 | ||
538f1952 WZ |
141 | #endif /* ! CONFIG_DYNAMIC_FTRACE */ |
142 | ||
29c5d346 WZ |
143 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
144 | ||
145 | NESTED(ftrace_graph_caller, PT_SIZE, ra) | |
cbe555b0 | 146 | #ifndef CONFIG_DYNAMIC_FTRACE |
29c5d346 | 147 | MCOUNT_SAVE_REGS |
e17ff5fe | 148 | #endif |
7326c4e5 | 149 | |
cbe555b0 | 150 | /* arg1: Get the location of the parent's return address */ |
7326c4e5 | 151 | #ifdef KBUILD_MCOUNT_RA_ADDRESS |
cbe555b0 WZ |
152 | #ifdef CONFIG_DYNAMIC_FTRACE |
153 | PTR_L a0, PT_R12(sp) | |
154 | #else | |
56b49cd3 | 155 | move a0, MCOUNT_RA_ADDRESS_REG |
cbe555b0 | 156 | #endif |
56b49cd3 | 157 | bnez a0, 1f /* non-leaf func: stored in MCOUNT_RA_ADDRESS_REG */ |
7326c4e5 | 158 | nop |
cbe555b0 WZ |
159 | #endif |
160 | PTR_LA a0, PT_R1(sp) /* leaf func: the location in current stack */ | |
161 | 1: | |
162 | ||
163 | /* arg2: Get self return address */ | |
164 | #ifdef CONFIG_DYNAMIC_FTRACE | |
165 | PTR_L a1, PT_R31(sp) | |
7326c4e5 | 166 | #else |
cbe555b0 | 167 | move a1, ra |
7326c4e5 | 168 | #endif |
cbe555b0 WZ |
169 | |
170 | /* arg3: Get frame pointer of current stack */ | |
046199ca | 171 | #ifdef CONFIG_FRAME_POINTER |
65ab2826 | 172 | move a2, fp |
cbe555b0 | 173 | #else /* ! CONFIG_FRAME_POINTER */ |
046199ca | 174 | #ifdef CONFIG_64BIT |
65ab2826 | 175 | PTR_LA a2, PT_SIZE(sp) |
046199ca | 176 | #else |
65ab2826 | 177 | PTR_LA a2, (PT_SIZE+8)(sp) |
046199ca WZ |
178 | #endif |
179 | #endif | |
29c5d346 | 180 | |
cbe555b0 WZ |
181 | jal prepare_ftrace_return |
182 | nop | |
29c5d346 WZ |
183 | MCOUNT_RESTORE_REGS |
184 | RETURN_BACK | |
185 | END(ftrace_graph_caller) | |
186 | ||
187 | .align 2 | |
188 | .globl return_to_handler | |
189 | return_to_handler: | |
190 | PTR_SUBU sp, PT_SIZE | |
191 | PTR_S v0, PT_R2(sp) | |
192 | ||
193 | jal ftrace_return_to_handler | |
194 | PTR_S v1, PT_R3(sp) | |
195 | ||
196 | /* restore the real parent address: v0 -> ra */ | |
197 | move ra, v0 | |
198 | ||
199 | PTR_L v0, PT_R2(sp) | |
200 | PTR_L v1, PT_R3(sp) | |
201 | jr ra | |
202 | PTR_ADDIU sp, PT_SIZE | |
203 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ | |
204 | ||
d2bb0762 WZ |
205 | .set at |
206 | .set reorder |