| /* |
| * Copyright (C) 2000 Anton Blanchard (anton@linuxcare.com) |
| * |
| * This file implements mcount(), which is used to collect profiling data. |
| * This can also be tweaked for kernel stack overflow detection. |
| */ |
| |
| #include <linux/linkage.h> |
| |
| /* |
| * This is the main variant and is called by C code. GCC's -pg option |
| * automatically instruments every C function with a call to this. |
| */ |
| |
| .text |
| .align 32 |
| .globl _mcount |
| .type _mcount,#function |
| .globl mcount |
| .type mcount,#function |
| _mcount: |
| mcount: |
| #ifdef CONFIG_FUNCTION_TRACER |
| #ifdef CONFIG_DYNAMIC_FTRACE |
| /* Do nothing, the retl/nop below is all we need. */ |
| #else |
| sethi %hi(function_trace_stop), %g1 |
| lduw [%g1 + %lo(function_trace_stop)], %g2 |
| brnz,pn %g2, 1f |
| sethi %hi(ftrace_trace_function), %g1 |
| sethi %hi(ftrace_stub), %g2 |
| ldx [%g1 + %lo(ftrace_trace_function)], %g1 |
| or %g2, %lo(ftrace_stub), %g2 |
| cmp %g1, %g2 |
| be,pn %icc, 1f |
| mov %i7, %g2 |
| save %sp, -128, %sp |
| mov %g2, %o1 |
| jmpl %g1, %o7 |
| mov %i7, %o0 |
| ret |
| restore |
| /* not reached */ |
| 1: |
| #endif |
| #endif |
| retl |
| nop |
| .size _mcount,.-_mcount |
| .size mcount,.-mcount |
| |
| #ifdef CONFIG_FUNCTION_TRACER |
| .globl ftrace_stub |
| .type ftrace_stub,#function |
| ftrace_stub: |
| retl |
| nop |
| .size ftrace_stub,.-ftrace_stub |
| #ifdef CONFIG_DYNAMIC_FTRACE |
| .globl ftrace_caller |
| .type ftrace_caller,#function |
| ftrace_caller: |
| sethi %hi(function_trace_stop), %g1 |
| mov %i7, %g2 |
| lduw [%g1 + %lo(function_trace_stop)], %g3 |
| brnz,pn %g3, ftrace_stub |
| nop |
| save %sp, -128, %sp |
| mov %g2, %o1 |
| .globl ftrace_call |
| ftrace_call: |
| call ftrace_stub |
| mov %i7, %o0 |
| ret |
| restore |
| .size ftrace_call,.-ftrace_call |
| .size ftrace_caller,.-ftrace_caller |
| #endif |
| #endif |