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review.shift-gmbh.com / SHIFTPHONES / mainline / linux / 046199cae714a7f9e88f5a7940b077f4515f48cb / . / arch / mips / kernel / mcount.S
blob: bdfef2c24f16b39ee94016feab473675b3b7d379 [file] [log] [blame]
Wu Zhangjind2bb07622009-11-20 20:34:29 +0800[diff] [blame]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
9 * Author: Wu Zhangjin <wuzj@lemote.com>
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
Wu Zhangjin538f1952009-11-20 20:34:32 +0800[diff] [blame]61#ifdef CONFIG_DYNAMIC_FTRACE
62
63NESTED(ftrace_caller, PT_SIZE, ra)
64 .globl _mcount
65_mcount:
66 b ftrace_stub
67 nop
68 lw t0, function_trace_stop
69 bnez t0, ftrace_stub
70 nop
71
72 MCOUNT_SAVE_REGS
73
74 move a0, ra /* arg1: next ip, selfaddr */
75 .globl ftrace_call
76ftrace_call:
77 nop /* a placeholder for the call to a real tracing function */
78 move a1, AT /* arg2: the caller's next ip, parent */
79
Wu Zhangjine17ff5f2009-11-20 20:34:35 +0800[diff] [blame]80#ifdef CONFIG_FUNCTION_GRAPH_TRACER
81 .globl ftrace_graph_call
82ftrace_graph_call:
83 nop
84 nop
85#endif
86
Wu Zhangjin538f1952009-11-20 20:34:32 +0800[diff] [blame]87 MCOUNT_RESTORE_REGS
88 .globl ftrace_stub
89ftrace_stub:
90 RETURN_BACK
91 END(ftrace_caller)
92
93#else /* ! CONFIG_DYNAMIC_FTRACE */
94
Wu Zhangjind2bb07622009-11-20 20:34:29 +0800[diff] [blame]95NESTED(_mcount, PT_SIZE, ra)
Wu Zhangjin69a7d1b2009-11-20 20:34:30 +0800[diff] [blame]96 lw t0, function_trace_stop
97 bnez t0, ftrace_stub
98 nop
Wu Zhangjind2bb07622009-11-20 20:34:29 +0800[diff] [blame]99 PTR_LA t0, ftrace_stub
100 PTR_L t1, ftrace_trace_function /* Prepare t1 for (1) */
101 bne t0, t1, static_trace
102 nop
Wu Zhangjin29c5d342009-11-20 20:34:34 +0800[diff] [blame]103
104#ifdef CONFIG_FUNCTION_GRAPH_TRACER
105 PTR_L t2, ftrace_graph_return
106 bne t0, t2, ftrace_graph_caller
107 nop
108 PTR_LA t0, ftrace_graph_entry_stub
109 PTR_L t2, ftrace_graph_entry
110 bne t0, t2, ftrace_graph_caller
111 nop
112#endif
Wu Zhangjind2bb07622009-11-20 20:34:29 +0800[diff] [blame]113 b ftrace_stub
114 nop
115
116static_trace:
117 MCOUNT_SAVE_REGS
118
119 move a0, ra /* arg1: next ip, selfaddr */
120 jalr t1 /* (1) call *ftrace_trace_function */
121 move a1, AT /* arg2: the caller's next ip, parent */
122
123 MCOUNT_RESTORE_REGS
124 .globl ftrace_stub
125ftrace_stub:
126 RETURN_BACK
127 END(_mcount)
128
Wu Zhangjin538f1952009-11-20 20:34:32 +0800[diff] [blame]129#endif /* ! CONFIG_DYNAMIC_FTRACE */
130
Wu Zhangjin29c5d342009-11-20 20:34:34 +0800[diff] [blame]131#ifdef CONFIG_FUNCTION_GRAPH_TRACER
132
133NESTED(ftrace_graph_caller, PT_SIZE, ra)
Wu Zhangjine17ff5f2009-11-20 20:34:35 +0800[diff] [blame]134#ifdef CONFIG_DYNAMIC_FTRACE
135 PTR_L a1, PT_R31(sp) /* load the original ra from the stack */
136#else
Wu Zhangjin29c5d342009-11-20 20:34:34 +0800[diff] [blame]137 MCOUNT_SAVE_REGS
Wu Zhangjin29c5d342009-11-20 20:34:34 +0800[diff] [blame]138 move a1, ra /* arg2: next ip, selfaddr */
Wu Zhangjine17ff5f2009-11-20 20:34:35 +0800[diff] [blame]139#endif
140 PTR_LA a0, PT_R1(sp) /* arg1: &AT -> a0 */
Wu Zhangjin29c5d342009-11-20 20:34:34 +0800[diff] [blame]141 jal prepare_ftrace_return
Wu Zhangjin046199c2009-11-20 20:34:36 +0800[diff] [blame^]142#ifdef CONFIG_FRAME_POINTER
Wu Zhangjin29c5d342009-11-20 20:34:34 +0800[diff] [blame]143 move a2, fp /* arg3: frame pointer */
Wu Zhangjin046199c2009-11-20 20:34:36 +0800[diff] [blame^]144#else
145#ifdef CONFIG_64BIT
146 PTR_LA a2, PT_SIZE(sp)
147#else
148 PTR_LA a2, (PT_SIZE+8)(sp)
149#endif
150#endif
Wu Zhangjin29c5d342009-11-20 20:34:34 +0800[diff] [blame]151
152 MCOUNT_RESTORE_REGS
153 RETURN_BACK
154 END(ftrace_graph_caller)
155
156 .align 2
157 .globl return_to_handler
158return_to_handler:
159 PTR_SUBU sp, PT_SIZE
160 PTR_S v0, PT_R2(sp)
161
162 jal ftrace_return_to_handler
163 PTR_S v1, PT_R3(sp)
164
165 /* restore the real parent address: v0 -> ra */
166 move ra, v0
167
168 PTR_L v0, PT_R2(sp)
169 PTR_L v1, PT_R3(sp)
170 jr ra
171 PTR_ADDIU sp, PT_SIZE
172#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
173
Wu Zhangjind2bb07622009-11-20 20:34:29 +0800[diff] [blame]174 .set at
175 .set reorder