git://bbs.cooldavid.org / net-next-2.6.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * Copyright (C) 2000 Anton Blanchard (anton@linuxcare.com) | |
| 3 | * | |
| 4 | * This file implements mcount(), which is used to collect profiling data. | |
| 5 | * This can also be tweaked for kernel stack overflow detection. | |
| 6 | */ | |
| 7 | ||
| 1da177e4 LT |
8 | #include <linux/linkage.h> |
| 9 | ||
| 1da177e4 LT |
10 | /* |
| 11 | * This is the main variant and is called by C code. GCC's -pg option | |
| 12 | * automatically instruments every C function with a call to this. | |
| 13 | */ | |
| 14 | ||
| 1da177e4 | 15 | .text |
| d05f5f99 DM |
16 | .align 32 |
| 17 | .globl _mcount | |
| 18 | .type _mcount,#function | |
| 19 | .globl mcount | |
| 20 | .type mcount,#function | |
| 1da177e4 | 21 | _mcount: |
| d05f5f99 | 22 | mcount: |
| 606576ce | 23 | #ifdef CONFIG_FUNCTION_TRACER |
| d05f5f99 | 24 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 63b75495 | 25 | /* Do nothing, the retl/nop below is all we need. */ |
| d05f5f99 | 26 | #else |
| 63b75495 DM |
27 | sethi %hi(function_trace_stop), %g1 |
| 28 | lduw [%g1 + %lo(function_trace_stop)], %g2 | |
| 9960e9e8 | 29 | brnz,pn %g2, 2f |
| 63b75495 | 30 | sethi %hi(ftrace_trace_function), %g1 |
| d05f5f99 DM |
31 | sethi %hi(ftrace_stub), %g2 |
| 32 | ldx [%g1 + %lo(ftrace_trace_function)], %g1 | |
| 33 | or %g2, %lo(ftrace_stub), %g2 | |
| 34 | cmp %g1, %g2 | |
| 35 | be,pn %icc, 1f | |
| 9960e9e8 | 36 | mov %i7, %g3 |
| 035df35d | 37 | save %sp, -176, %sp |
| 9960e9e8 | 38 | mov %g3, %o1 |
| a71d1d6b DM |
39 | jmpl %g1, %o7 |
| 40 | mov %i7, %o0 | |
| 41 | ret | |
| 42 | restore | |
| d05f5f99 DM |
43 | /* not reached */ |
| 44 | 1: | |
| 9960e9e8 DM |
45 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| 46 | sethi %hi(ftrace_graph_return), %g1 | |
| 47 | ldx [%g1 + %lo(ftrace_graph_return)], %g3 | |
| 48 | cmp %g2, %g3 | |
| 49 | bne,pn %xcc, 5f | |
| 50 | sethi %hi(ftrace_graph_entry_stub), %g2 | |
| 51 | sethi %hi(ftrace_graph_entry), %g1 | |
| 52 | or %g2, %lo(ftrace_graph_entry_stub), %g2 | |
| 53 | ldx [%g1 + %lo(ftrace_graph_entry)], %g1 | |
| 54 | cmp %g1, %g2 | |
| 55 | be,pt %xcc, 2f | |
| 56 | nop | |
| 57 | 5: mov %i7, %g2 | |
| 58 | mov %fp, %g3 | |
| 035df35d | 59 | save %sp, -176, %sp |
| 9960e9e8 DM |
60 | mov %g2, %l0 |
| 61 | ba,pt %xcc, ftrace_graph_caller | |
| 62 | mov %g3, %l1 | |
| 63 | #endif | |
| 64 | 2: | |
| 1da177e4 | 65 | #endif |
| d05f5f99 DM |
66 | #endif |
| 67 | retl | |
| 1da177e4 | 68 | nop |
| d05f5f99 DM |
69 | .size _mcount,.-_mcount |
| 70 | .size mcount,.-mcount | |
| 71 | ||
| 606576ce | 72 | #ifdef CONFIG_FUNCTION_TRACER |
| d05f5f99 DM |
73 | .globl ftrace_stub |
| 74 | .type ftrace_stub,#function | |
| 75 | ftrace_stub: | |
| 76 | retl | |
| 77 | nop | |
| 78 | .size ftrace_stub,.-ftrace_stub | |
| 79 | #ifdef CONFIG_DYNAMIC_FTRACE | |
| 80 | .globl ftrace_caller | |
| 81 | .type ftrace_caller,#function | |
| 82 | ftrace_caller: | |
| 63b75495 | 83 | sethi %hi(function_trace_stop), %g1 |
| a71d1d6b | 84 | mov %i7, %g2 |
| 9960e9e8 DM |
85 | lduw [%g1 + %lo(function_trace_stop)], %g1 |
| 86 | brnz,pn %g1, ftrace_stub | |
| 87 | mov %fp, %g3 | |
| 035df35d | 88 | save %sp, -176, %sp |
| a71d1d6b | 89 | mov %g2, %o1 |
| 9960e9e8 DM |
90 | mov %g2, %l0 |
| 91 | mov %g3, %l1 | |
| d05f5f99 DM |
92 | .globl ftrace_call |
| 93 | ftrace_call: | |
| 94 | call ftrace_stub | |
| a71d1d6b | 95 | mov %i7, %o0 |
| 9960e9e8 DM |
96 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| 97 | .globl ftrace_graph_call | |
| 98 | ftrace_graph_call: | |
| 99 | call ftrace_stub | |
| 100 | nop | |
| 101 | #endif | |
| a71d1d6b DM |
102 | ret |
| 103 | restore | |
| 9960e9e8 DM |
104 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| 105 | .size ftrace_graph_call,.-ftrace_graph_call | |
| 106 | #endif | |
| 63b75495 | 107 | .size ftrace_call,.-ftrace_call |
| d05f5f99 DM |
108 | .size ftrace_caller,.-ftrace_caller |
| 109 | #endif | |
| 110 | #endif | |
| 9960e9e8 DM |
111 | |
| 112 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
| 113 | ENTRY(ftrace_graph_caller) | |
| 114 | mov %l0, %o0 | |
| 115 | mov %i7, %o1 | |
| 116 | call prepare_ftrace_return | |
| 117 | mov %l1, %o2 | |
| 118 | ret | |
| 119 | restore %o0, -8, %i7 | |
| 120 | END(ftrace_graph_caller) | |
| 121 | ||
| 122 | ENTRY(return_to_handler) | |
| 035df35d | 123 | save %sp, -176, %sp |
| 9960e9e8 DM |
124 | call ftrace_return_to_handler |
| 125 | mov %fp, %o0 | |
| 126 | jmpl %o0 + 8, %g0 | |
| 127 | restore | |
| 128 | END(return_to_handler) | |
| 129 | #endif |