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2fd7c761a2
If -pg of gcc is enabled with CONFIG_FUNCTION_TRACER=y. a calling to _mcount will be inserted into each kernel function. so, there is a possibility to trace the kernel functions in _mcount. This patch add the specific _mcount support for static function tracing. by default, ftrace_trace_function is initialized as ftrace_stub(an empty function), so, the default _mcount will introduce very little overhead. after enabling ftrace in user-space, it will jump to a real tracing function and do static function tracing for us. Commit message from Wu Zhangjin <wuzhangjin@gmail.com> Signed-off-by: Michal Simek <monstr@monstr.eu>
55 lines
1.4 KiB
C
55 lines
1.4 KiB
C
/*
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* Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
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* Copyright (C) 2008-2009 PetaLogix
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/cryptohash.h>
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#include <linux/delay.h>
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#include <linux/in6.h>
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#include <linux/syscalls.h>
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#include <asm/checksum.h>
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#include <linux/io.h>
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#include <asm/page.h>
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#include <asm/system.h>
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#include <linux/ftrace.h>
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#include <linux/uaccess.h>
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/*
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* libgcc functions - functions that are used internally by the
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* compiler... (prototypes are not correct though, but that
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* doesn't really matter since they're not versioned).
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*/
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extern void __ashldi3(void);
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EXPORT_SYMBOL(__ashldi3);
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extern void __ashrdi3(void);
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EXPORT_SYMBOL(__ashrdi3);
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extern void __divsi3(void);
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EXPORT_SYMBOL(__divsi3);
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extern void __lshrdi3(void);
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EXPORT_SYMBOL(__lshrdi3);
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extern void __modsi3(void);
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EXPORT_SYMBOL(__modsi3);
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extern void __mulsi3(void);
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EXPORT_SYMBOL(__mulsi3);
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extern void __muldi3(void);
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EXPORT_SYMBOL(__muldi3);
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extern void __ucmpdi2(void);
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EXPORT_SYMBOL(__ucmpdi2);
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extern void __udivsi3(void);
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EXPORT_SYMBOL(__udivsi3);
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extern void __umodsi3(void);
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EXPORT_SYMBOL(__umodsi3);
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extern char *_ebss;
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EXPORT_SYMBOL_GPL(_ebss);
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#ifdef CONFIG_FUNCTION_TRACER
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extern void _mcount(void);
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EXPORT_SYMBOL(_mcount);
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#endif
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