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 8#include <linux/linkage.h> 9#include <asm/export.h> 10 11/* 12 * This is the main variant and is called by C code. GCC's -pg option 13 * automatically instruments every C function with a call to this. 14 */ 15 16 .text 17 .align 32 18 .globl _mcount 19 .type _mcount,#function 20 EXPORT_SYMBOL(_mcount) 21 .globl mcount 22 .type mcount,#function 23_mcount: 24mcount: 25#ifdef CONFIG_FUNCTION_TRACER 26#ifdef CONFIG_DYNAMIC_FTRACE 27 /* Do nothing, the retl/nop below is all we need. */ 28#else 29 sethi %hi(ftrace_trace_function), %g1 30 sethi %hi(ftrace_stub), %g2 31 ldx [%g1 + %lo(ftrace_trace_function)], %g1 32 or %g2, %lo(ftrace_stub), %g2 33 cmp %g1, %g2 34 be,pn %icc, 1f 35 mov %i7, %g3 36 save %sp, -176, %sp 37 mov %g3, %o1 38 jmpl %g1, %o7 39 mov %i7, %o0 40 ret 41 restore 42 /* not reached */ 431: 44#ifdef CONFIG_FUNCTION_GRAPH_TRACER 45 sethi %hi(ftrace_graph_return), %g1 46 ldx [%g1 + %lo(ftrace_graph_return)], %g3 47 cmp %g2, %g3 48 bne,pn %xcc, 5f 49 sethi %hi(ftrace_graph_entry_stub), %g2 50 sethi %hi(ftrace_graph_entry), %g1 51 or %g2, %lo(ftrace_graph_entry_stub), %g2 52 ldx [%g1 + %lo(ftrace_graph_entry)], %g1 53 cmp %g1, %g2 54 be,pt %xcc, 2f 55 nop 565: mov %i7, %g2 57 mov %fp, %g3 58 save %sp, -176, %sp 59 mov %g2, %l0 60 ba,pt %xcc, ftrace_graph_caller 61 mov %g3, %l1 62#endif 632: 64#endif 65#endif 66 retl 67 nop 68 .size _mcount,.-_mcount 69 .size mcount,.-mcount 70 71#ifdef CONFIG_FUNCTION_TRACER 72 .globl ftrace_stub 73 .type ftrace_stub,#function 74ftrace_stub: 75 retl 76 nop 77 .size ftrace_stub,.-ftrace_stub 78#ifdef CONFIG_DYNAMIC_FTRACE 79 .globl ftrace_caller 80 .type ftrace_caller,#function 81ftrace_caller: 82 mov %i7, %g2 83 mov %fp, %g3 84 save %sp, -176, %sp 85 mov %g2, %o1 86 mov %g2, %l0 87 mov %g3, %l1 88 .globl ftrace_call 89ftrace_call: 90 call ftrace_stub 91 mov %i7, %o0 92#ifdef CONFIG_FUNCTION_GRAPH_TRACER 93 .globl ftrace_graph_call 94ftrace_graph_call: 95 call ftrace_stub 96 nop 97#endif 98 ret 99 restore 100#ifdef CONFIG_FUNCTION_GRAPH_TRACER 101 .size ftrace_graph_call,.-ftrace_graph_call 102#endif 103 .size ftrace_call,.-ftrace_call 104 .size ftrace_caller,.-ftrace_caller 105#endif 106#endif 107 108#ifdef CONFIG_FUNCTION_GRAPH_TRACER 109ENTRY(ftrace_graph_caller) 110 mov %l0, %o0 111 mov %i7, %o1 112 call prepare_ftrace_return 113 mov %l1, %o2 114 ret 115 restore %o0, -8, %i7 116END(ftrace_graph_caller) 117 118ENTRY(return_to_handler) 119 save %sp, -176, %sp 120 call ftrace_return_to_handler 121 mov %fp, %o0 122 jmpl %o0 + 8, %g0 123 restore 124END(return_to_handler) 125#endif 126