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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 | |
f7a904df | 9 | * Author: Wu Zhangjin <wuzhangjin@gmail.com> |
d2bb0762 WZ |
10 | */ |
11 | ||
12 | #include <asm/regdef.h> | |
13 | #include <asm/stackframe.h> | |
14 | #include <asm/ftrace.h> | |
15 | ||
16 | .text | |
17 | .set noreorder | |
18 | .set noat | |
19 | ||
20 | .macro MCOUNT_SAVE_REGS | |
21 | PTR_SUBU sp, PT_SIZE | |
22 | PTR_S ra, PT_R31(sp) | |
23 | PTR_S AT, PT_R1(sp) | |
24 | PTR_S a0, PT_R4(sp) | |
25 | PTR_S a1, PT_R5(sp) | |
26 | PTR_S a2, PT_R6(sp) | |
27 | PTR_S a3, PT_R7(sp) | |
28 | #ifdef CONFIG_64BIT | |
29 | PTR_S a4, PT_R8(sp) | |
30 | PTR_S a5, PT_R9(sp) | |
31 | PTR_S a6, PT_R10(sp) | |
32 | PTR_S a7, PT_R11(sp) | |
33 | #endif | |
34 | .endm | |
35 | ||
36 | .macro MCOUNT_RESTORE_REGS | |
37 | PTR_L ra, PT_R31(sp) | |
38 | PTR_L AT, PT_R1(sp) | |
39 | PTR_L a0, PT_R4(sp) | |
40 | PTR_L a1, PT_R5(sp) | |
41 | PTR_L a2, PT_R6(sp) | |
42 | PTR_L a3, PT_R7(sp) | |
43 | #ifdef CONFIG_64BIT | |
44 | PTR_L a4, PT_R8(sp) | |
45 | PTR_L a5, PT_R9(sp) | |
46 | PTR_L a6, PT_R10(sp) | |
47 | PTR_L a7, PT_R11(sp) | |
48 | #endif | |
49 | #ifdef CONFIG_64BIT | |
50 | PTR_ADDIU sp, PT_SIZE | |
51 | #else | |
52 | PTR_ADDIU sp, (PT_SIZE + 8) | |
53 | #endif | |
54 | .endm | |
55 | ||
56 | .macro RETURN_BACK | |
57 | jr ra | |
58 | move ra, AT | |
59 | .endm | |
60 | ||
538f1952 WZ |
61 | #ifdef CONFIG_DYNAMIC_FTRACE |
62 | ||
63 | NESTED(ftrace_caller, PT_SIZE, ra) | |
64 | .globl _mcount | |
65 | _mcount: | |
66 | b ftrace_stub | |
67 | nop | |
fc49a3be WZ |
68 | lw t1, function_trace_stop |
69 | bnez t1, ftrace_stub | |
538f1952 WZ |
70 | nop |
71 | ||
72 | MCOUNT_SAVE_REGS | |
7326c4e5 WZ |
73 | #ifdef KBUILD_MCOUNT_RA_ADDRESS |
74 | PTR_S t0, PT_R12(sp) /* t0 saved the location of the return address(at) by -mmcount-ra-address */ | |
75 | #endif | |
538f1952 WZ |
76 | |
77 | move a0, ra /* arg1: next ip, selfaddr */ | |
78 | .globl ftrace_call | |
79 | ftrace_call: | |
80 | nop /* a placeholder for the call to a real tracing function */ | |
81 | move a1, AT /* arg2: the caller's next ip, parent */ | |
82 | ||
e17ff5fe WZ |
83 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
84 | .globl ftrace_graph_call | |
85 | ftrace_graph_call: | |
86 | nop | |
87 | nop | |
88 | #endif | |
89 | ||
538f1952 WZ |
90 | MCOUNT_RESTORE_REGS |
91 | .globl ftrace_stub | |
92 | ftrace_stub: | |
93 | RETURN_BACK | |
94 | END(ftrace_caller) | |
95 | ||
96 | #else /* ! CONFIG_DYNAMIC_FTRACE */ | |
97 | ||
d2bb0762 | 98 | NESTED(_mcount, PT_SIZE, ra) |
fc49a3be WZ |
99 | lw t1, function_trace_stop |
100 | bnez t1, ftrace_stub | |
69a7d1b3 | 101 | nop |
fc49a3be WZ |
102 | PTR_LA t1, ftrace_stub |
103 | PTR_L t2, ftrace_trace_function /* Prepare t2 for (1) */ | |
104 | bne t1, t2, static_trace | |
d2bb0762 | 105 | nop |
29c5d346 WZ |
106 | |
107 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
fc49a3be WZ |
108 | PTR_L t3, ftrace_graph_return |
109 | bne t1, t3, ftrace_graph_caller | |
29c5d346 | 110 | nop |
fc49a3be WZ |
111 | PTR_LA t1, ftrace_graph_entry_stub |
112 | PTR_L t3, ftrace_graph_entry | |
113 | bne t1, t3, ftrace_graph_caller | |
29c5d346 WZ |
114 | nop |
115 | #endif | |
d2bb0762 WZ |
116 | b ftrace_stub |
117 | nop | |
118 | ||
119 | static_trace: | |
120 | MCOUNT_SAVE_REGS | |
121 | ||
122 | move a0, ra /* arg1: next ip, selfaddr */ | |
fc49a3be | 123 | jalr t2 /* (1) call *ftrace_trace_function */ |
d2bb0762 WZ |
124 | move a1, AT /* arg2: the caller's next ip, parent */ |
125 | ||
126 | MCOUNT_RESTORE_REGS | |
127 | .globl ftrace_stub | |
128 | ftrace_stub: | |
129 | RETURN_BACK | |
130 | END(_mcount) | |
131 | ||
538f1952 WZ |
132 | #endif /* ! CONFIG_DYNAMIC_FTRACE */ |
133 | ||
29c5d346 WZ |
134 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
135 | ||
136 | NESTED(ftrace_graph_caller, PT_SIZE, ra) | |
e17ff5fe WZ |
137 | #ifdef CONFIG_DYNAMIC_FTRACE |
138 | PTR_L a1, PT_R31(sp) /* load the original ra from the stack */ | |
7326c4e5 WZ |
139 | #ifdef KBUILD_MCOUNT_RA_ADDRESS |
140 | PTR_L t0, PT_R12(sp) /* load the original t0 from the stack */ | |
141 | #endif | |
e17ff5fe | 142 | #else |
29c5d346 | 143 | MCOUNT_SAVE_REGS |
29c5d346 | 144 | move a1, ra /* arg2: next ip, selfaddr */ |
e17ff5fe | 145 | #endif |
7326c4e5 WZ |
146 | |
147 | #ifdef KBUILD_MCOUNT_RA_ADDRESS | |
148 | bnez t0, 1f /* non-leaf func: t0 saved the location of the return address */ | |
149 | nop | |
150 | PTR_LA t0, PT_R1(sp) /* leaf func: get the location of at(old ra) from our own stack */ | |
151 | 1: move a0, t0 /* arg1: the location of the return address */ | |
152 | #else | |
e17ff5fe | 153 | PTR_LA a0, PT_R1(sp) /* arg1: &AT -> a0 */ |
7326c4e5 | 154 | #endif |
29c5d346 | 155 | jal prepare_ftrace_return |
046199ca | 156 | #ifdef CONFIG_FRAME_POINTER |
29c5d346 | 157 | move a2, fp /* arg3: frame pointer */ |
046199ca WZ |
158 | #else |
159 | #ifdef CONFIG_64BIT | |
160 | PTR_LA a2, PT_SIZE(sp) | |
161 | #else | |
162 | PTR_LA a2, (PT_SIZE+8)(sp) | |
163 | #endif | |
164 | #endif | |
29c5d346 WZ |
165 | |
166 | MCOUNT_RESTORE_REGS | |
167 | RETURN_BACK | |
168 | END(ftrace_graph_caller) | |
169 | ||
170 | .align 2 | |
171 | .globl return_to_handler | |
172 | return_to_handler: | |
173 | PTR_SUBU sp, PT_SIZE | |
174 | PTR_S v0, PT_R2(sp) | |
175 | ||
176 | jal ftrace_return_to_handler | |
177 | PTR_S v1, PT_R3(sp) | |
178 | ||
179 | /* restore the real parent address: v0 -> ra */ | |
180 | move ra, v0 | |
181 | ||
182 | PTR_L v0, PT_R2(sp) | |
183 | PTR_L v1, PT_R3(sp) | |
184 | jr ra | |
185 | PTR_ADDIU sp, PT_SIZE | |
186 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ | |
187 | ||
d2bb0762 WZ |
188 | .set at |
189 | .set reorder |