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review.evervolv.com / android_kernel_oneplus_msm8996 / 042e571d224707b777d0995317c74812b960bfeb / . / arch / mips / kernel / mcount.S
blob: 9a029d40f6cfe95952ae1f3eb2ad1bd8c0de65e4 [file] [log] [blame]
Wu Zhangjind2bb0762009-11-20 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
Wu Zhangjin042e5712010-05-14 19:08:28 +0800[diff] [blame^]9 * Copyright (C) 2010 DSLab, Lanzhou University, China
Wu Zhangjinf7a904d2010-01-04 17:16:51 +0800[diff] [blame]10 * Author: Wu Zhangjin <wuzhangjin@gmail.com>
Wu Zhangjind2bb0762009-11-20 20:34:29 +0800[diff] [blame]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)
Wu Zhangjind2bb0762009-11-20 20:34:29 +0800[diff] [blame]49 PTR_ADDIU sp, PT_SIZE
50#else
51 PTR_ADDIU sp, (PT_SIZE + 8)
52#endif
53.endm
54
55 .macro RETURN_BACK
56 jr ra
57 move ra, AT
58 .endm
59
Wu Zhangjin538f1952009-11-20 20:34:32 +0800[diff] [blame]60#ifdef CONFIG_DYNAMIC_FTRACE
61
62NESTED(ftrace_caller, PT_SIZE, ra)
63 .globl _mcount
64_mcount:
65 b ftrace_stub
66 nop
Wu Zhangjinfc49a3b2009-11-20 20:34:37 +0800[diff] [blame]67 lw t1, function_trace_stop
68 bnez t1, ftrace_stub
Wu Zhangjin538f1952009-11-20 20:34:32 +0800[diff] [blame]69 nop
70
71 MCOUNT_SAVE_REGS
Wu Zhangjin7326c4e2009-11-20 20:34:38 +0800[diff] [blame]72#ifdef KBUILD_MCOUNT_RA_ADDRESS
Wu Zhangjin042e5712010-05-14 19:08:28 +0800[diff] [blame^]73 PTR_S t0, PT_R12(sp) /* save location of parent's return address */
Wu Zhangjin7326c4e2009-11-20 20:34:38 +0800[diff] [blame]74#endif
Wu Zhangjin538f1952009-11-20 20:34:32 +0800[diff] [blame]75
Wu Zhangjin042e5712010-05-14 19:08:28 +0800[diff] [blame^]76 move a0, ra /* arg1: self return address */
Wu Zhangjin538f1952009-11-20 20:34:32 +0800[diff] [blame]77 .globl ftrace_call
78ftrace_call:
79 nop /* a placeholder for the call to a real tracing function */
Wu Zhangjin042e5712010-05-14 19:08:28 +0800[diff] [blame^]80 move a1, AT /* arg2: parent's return address */
Wu Zhangjin538f1952009-11-20 20:34:32 +0800[diff] [blame]81
Wu Zhangjine17ff5f2009-11-20 20:34:35 +0800[diff] [blame]82#ifdef CONFIG_FUNCTION_GRAPH_TRACER
83 .globl ftrace_graph_call
84ftrace_graph_call:
85 nop
86 nop
87#endif
88
Wu Zhangjin538f1952009-11-20 20:34:32 +0800[diff] [blame]89 MCOUNT_RESTORE_REGS
90 .globl ftrace_stub
91ftrace_stub:
92 RETURN_BACK
93 END(ftrace_caller)
94
95#else /* ! CONFIG_DYNAMIC_FTRACE */
96
Wu Zhangjind2bb0762009-11-20 20:34:29 +0800[diff] [blame]97NESTED(_mcount, PT_SIZE, ra)
Wu Zhangjinfc49a3b2009-11-20 20:34:37 +0800[diff] [blame]98 lw t1, function_trace_stop
99 bnez t1, ftrace_stub
Wu Zhangjin69a7d1b2009-11-20 20:34:30 +0800[diff] [blame]100 nop
Wu Zhangjinfc49a3b2009-11-20 20:34:37 +0800[diff] [blame]101 PTR_LA t1, ftrace_stub
102 PTR_L t2, ftrace_trace_function /* Prepare t2 for (1) */
103 bne t1, t2, static_trace
Wu Zhangjind2bb0762009-11-20 20:34:29 +0800[diff] [blame]104 nop
Wu Zhangjin29c5d342009-11-20 20:34:34 +0800[diff] [blame]105
106#ifdef CONFIG_FUNCTION_GRAPH_TRACER
Wu Zhangjinfc49a3b2009-11-20 20:34:37 +0800[diff] [blame]107 PTR_L t3, ftrace_graph_return
108 bne t1, t3, ftrace_graph_caller
Wu Zhangjin29c5d342009-11-20 20:34:34 +0800[diff] [blame]109 nop
Wu Zhangjinfc49a3b2009-11-20 20:34:37 +0800[diff] [blame]110 PTR_LA t1, ftrace_graph_entry_stub
111 PTR_L t3, ftrace_graph_entry
112 bne t1, t3, ftrace_graph_caller
Wu Zhangjin29c5d342009-11-20 20:34:34 +0800[diff] [blame]113 nop
114#endif
Wu Zhangjind2bb0762009-11-20 20:34:29 +0800[diff] [blame]115 b ftrace_stub
116 nop
117
118static_trace:
119 MCOUNT_SAVE_REGS
120
Wu Zhangjin042e5712010-05-14 19:08:28 +0800[diff] [blame^]121 move a0, ra /* arg1: self return address */
Wu Zhangjinfc49a3b2009-11-20 20:34:37 +0800[diff] [blame]122 jalr t2 /* (1) call *ftrace_trace_function */
Wu Zhangjin042e5712010-05-14 19:08:28 +0800[diff] [blame^]123 move a1, AT /* arg2: parent's return address */
Wu Zhangjind2bb0762009-11-20 20:34:29 +0800[diff] [blame]124
125 MCOUNT_RESTORE_REGS
126 .globl ftrace_stub
127ftrace_stub:
128 RETURN_BACK
129 END(_mcount)
130
Wu Zhangjin538f1952009-11-20 20:34:32 +0800[diff] [blame]131#endif /* ! CONFIG_DYNAMIC_FTRACE */
132
Wu Zhangjin29c5d342009-11-20 20:34:34 +0800[diff] [blame]133#ifdef CONFIG_FUNCTION_GRAPH_TRACER
134
135NESTED(ftrace_graph_caller, PT_SIZE, ra)
Wu Zhangjincbe555b2010-05-14 19:08:27 +0800[diff] [blame]136#ifndef CONFIG_DYNAMIC_FTRACE
Wu Zhangjin29c5d342009-11-20 20:34:34 +0800[diff] [blame]137 MCOUNT_SAVE_REGS
Wu Zhangjine17ff5f2009-11-20 20:34:35 +0800[diff] [blame]138#endif
Wu Zhangjin7326c4e2009-11-20 20:34:38 +0800[diff] [blame]139
Wu Zhangjincbe555b2010-05-14 19:08:27 +0800[diff] [blame]140 /* arg1: Get the location of the parent's return address */
Wu Zhangjin7326c4e2009-11-20 20:34:38 +0800[diff] [blame]141#ifdef KBUILD_MCOUNT_RA_ADDRESS
Wu Zhangjincbe555b2010-05-14 19:08:27 +0800[diff] [blame]142#ifdef CONFIG_DYNAMIC_FTRACE
143 PTR_L a0, PT_R12(sp)
Wu Zhangjin7326c4e2009-11-20 20:34:38 +0800[diff] [blame]144#else
Wu Zhangjincbe555b2010-05-14 19:08:27 +0800[diff] [blame]145 move a0, t0
Wu Zhangjin7326c4e2009-11-20 20:34:38 +0800[diff] [blame]146#endif
Wu Zhangjincbe555b2010-05-14 19:08:27 +0800[diff] [blame]147 bnez a0, 1f /* non-leaf func: stored in t0 */
148 nop
149#endif
150 PTR_LA a0, PT_R1(sp) /* leaf func: the location in current stack */
1511:
152
153 /* arg2: Get self return address */
154#ifdef CONFIG_DYNAMIC_FTRACE
155 PTR_L a1, PT_R31(sp)
Wu Zhangjin046199c2009-11-20 20:34:36 +0800[diff] [blame]156#else
Wu Zhangjincbe555b2010-05-14 19:08:27 +0800[diff] [blame]157 move a1, ra
158#endif
159
160 /* arg3: Get frame pointer of current stack */
161#ifdef CONFIG_FRAME_POINTER
162 move a2, fp
163#else /* ! CONFIG_FRAME_POINTER */
Wu Zhangjin046199c2009-11-20 20:34:36 +0800[diff] [blame]164#ifdef CONFIG_64BIT
165 PTR_LA a2, PT_SIZE(sp)
166#else
167 PTR_LA a2, (PT_SIZE+8)(sp)
168#endif
169#endif
Wu Zhangjin29c5d342009-11-20 20:34:34 +0800[diff] [blame]170
Wu Zhangjincbe555b2010-05-14 19:08:27 +0800[diff] [blame]171 jal prepare_ftrace_return
172 nop
Wu Zhangjin29c5d342009-11-20 20:34:34 +0800[diff] [blame]173 MCOUNT_RESTORE_REGS
174 RETURN_BACK
175 END(ftrace_graph_caller)
176
177 .align 2
178 .globl return_to_handler
179return_to_handler:
180 PTR_SUBU sp, PT_SIZE
181 PTR_S v0, PT_R2(sp)
182
183 jal ftrace_return_to_handler
184 PTR_S v1, PT_R3(sp)
185
186 /* restore the real parent address: v0 -> ra */
187 move ra, v0
188
189 PTR_L v0, PT_R2(sp)
190 PTR_L v1, PT_R3(sp)
191 jr ra
192 PTR_ADDIU sp, PT_SIZE
193#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
194
Wu Zhangjind2bb0762009-11-20 20:34:29 +0800[diff] [blame]195 .set at
196 .set reorder