git://bbs.cooldavid.org / net-next-2.6.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | |
| 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 | ||
| 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 | |
| 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 | |
| 76 | ftrace_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 | ||
| 80 | MCOUNT_RESTORE_REGS | |
| 81 | .globl ftrace_stub | |
| 82 | ftrace_stub: | |
| 83 | RETURN_BACK | |
| 84 | END(ftrace_caller) | |
| 85 | ||
| 86 | #else /* ! CONFIG_DYNAMIC_FTRACE */ | |
| 87 | ||
| d2bb0762 | 88 | NESTED(_mcount, PT_SIZE, ra) |
| 69a7d1b3 WZ |
89 | lw t0, function_trace_stop |
| 90 | bnez t0, ftrace_stub | |
| 91 | nop | |
| d2bb0762 WZ |
92 | PTR_LA t0, ftrace_stub |
| 93 | PTR_L t1, ftrace_trace_function /* Prepare t1 for (1) */ | |
| 94 | bne t0, t1, static_trace | |
| 95 | nop | |
| 29c5d346 WZ |
96 | |
| 97 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
| 98 | PTR_L t2, ftrace_graph_return | |
| 99 | bne t0, t2, ftrace_graph_caller | |
| 100 | nop | |
| 101 | PTR_LA t0, ftrace_graph_entry_stub | |
| 102 | PTR_L t2, ftrace_graph_entry | |
| 103 | bne t0, t2, ftrace_graph_caller | |
| 104 | nop | |
| 105 | #endif | |
| d2bb0762 WZ |
106 | b ftrace_stub |
| 107 | nop | |
| 108 | ||
| 109 | static_trace: | |
| 110 | MCOUNT_SAVE_REGS | |
| 111 | ||
| 112 | move a0, ra /* arg1: next ip, selfaddr */ | |
| 113 | jalr t1 /* (1) call *ftrace_trace_function */ | |
| 114 | move a1, AT /* arg2: the caller's next ip, parent */ | |
| 115 | ||
| 116 | MCOUNT_RESTORE_REGS | |
| 117 | .globl ftrace_stub | |
| 118 | ftrace_stub: | |
| 119 | RETURN_BACK | |
| 120 | END(_mcount) | |
| 121 | ||
| 538f1952 WZ |
122 | #endif /* ! CONFIG_DYNAMIC_FTRACE */ |
| 123 | ||
| 29c5d346 WZ |
124 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| 125 | ||
| 126 | NESTED(ftrace_graph_caller, PT_SIZE, ra) | |
| 127 | MCOUNT_SAVE_REGS | |
| 128 | ||
| 129 | PTR_LA a0, PT_R1(sp) /* arg1: &AT -> a0 */ | |
| 130 | move a1, ra /* arg2: next ip, selfaddr */ | |
| 131 | jal prepare_ftrace_return | |
| 132 | move a2, fp /* arg3: frame pointer */ | |
| 133 | ||
| 134 | MCOUNT_RESTORE_REGS | |
| 135 | RETURN_BACK | |
| 136 | END(ftrace_graph_caller) | |
| 137 | ||
| 138 | .align 2 | |
| 139 | .globl return_to_handler | |
| 140 | return_to_handler: | |
| 141 | PTR_SUBU sp, PT_SIZE | |
| 142 | PTR_S v0, PT_R2(sp) | |
| 143 | ||
| 144 | jal ftrace_return_to_handler | |
| 145 | PTR_S v1, PT_R3(sp) | |
| 146 | ||
| 147 | /* restore the real parent address: v0 -> ra */ | |
| 148 | move ra, v0 | |
| 149 | ||
| 150 | PTR_L v0, PT_R2(sp) | |
| 151 | PTR_L v1, PT_R3(sp) | |
| 152 | jr ra | |
| 153 | PTR_ADDIU sp, PT_SIZE | |
| 154 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ | |
| 155 | ||
| d2bb0762 WZ |
156 | .set at |
| 157 | .set reorder |