File: [cvs.NetBSD.org] / src / sys / arch / i386 / include / profile.h (download)
Revision 1.36, Sun Jun 4 16:35:59 2017 UTC (6 years, 10 months ago) by christos
Branch: MAIN
Changes since 1.35: +5 -4
lines
- prevent optimization from omitting the frame pointer (and re-using it);
we use it in our inline assembly.
- convert to c a little assembly to make the code more understandable.
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/* $NetBSD: profile.h,v 1.36 2017/06/04 16:35:59 christos Exp $ */
/*
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)profile.h 8.1 (Berkeley) 6/11/93
*/
#ifdef _KERNEL
#include <machine/cpufunc.h>
#endif
#define _MCOUNT_DECL static __inline void _mcount
#ifdef __ELF__
#define MCOUNT_ENTRY "__mcount"
#define MCOUNT_COMPAT __weak_alias(mcount, __mcount)
#else
#define MCOUNT_ENTRY "mcount"
#define MCOUNT_COMPAT /* nothing */
#endif
#if defined(_REENTRANT) && !defined(_KERNEL)
#define MCOUNT_ACTIVE if (_gmonparam.state != GMON_PROF_ON) return
#else
#define MCOUNT_ACTIVE
#endif
#define MCOUNT \
MCOUNT_COMPAT \
extern void mcount(void) __asm(MCOUNT_ENTRY) \
__attribute__((__no_instrument_function__)) \
__attribute__((__optimize__("-fno-omit-frame-pointer"))); \
void \
mcount(void) \
{ \
int selfpc, frompcindex; \
int eax, ecx, edx; \
\
MCOUNT_ACTIVE; \
__asm volatile("movl %%eax,%0" : "=g" (eax)); \
__asm volatile("movl %%ecx,%0" : "=g" (ecx)); \
__asm volatile("movl %%edx,%0" : "=g" (edx)); \
/* \
* find the return address for mcount, \
* and the return address for mcount's caller. \
* \
* selfpc = pc pushed by mcount call \
*/ \
__asm volatile("movl 4(%%ebp),%0" : "=r" (selfpc)); \
/* \
* frompcindex = pc pushed by call into self. \
*/ \
__asm volatile("movl (%%ebp),%0" : "=r" (frompcindex)); \
frompcindex = ((int *)frompcindex)[1]; \
_mcount((u_long)frompcindex, (u_long)selfpc); \
\
__asm volatile("movl %0,%%edx" : : "g" (edx)); \
__asm volatile("movl %0,%%ecx" : : "g" (ecx)); \
__asm volatile("movl %0,%%eax" : : "g" (eax)); \
}
#ifdef _KERNEL
static inline void
mcount_disable_intr(void)
{
__asm volatile("cli");
}
static inline u_long
mcount_read_psl(void)
{
u_long ef;
__asm volatile("pushfl; popl %0" : "=r" (ef));
return (ef);
}
static inline void
mcount_write_psl(u_long ef)
{
__asm volatile("pushl %0; popfl" : : "r" (ef));
}
#define MCOUNT_ENTER \
do { s = (int)mcount_read_psl(); mcount_disable_intr(); } while (0)
#define MCOUNT_EXIT do { mcount_write_psl(s); } while (0)
#endif /* _KERNEL */