1/*	$NetBSD: profile.h,v 1.38 2021/11/02 11:26:04 ryo Exp $	*/
  2
  3/*
  4 * Copyright (c) 1992, 1993
  5 *	The Regents of the University of California.  All rights reserved.
  6 *
  7 * Redistribution and use in source and binary forms, with or without
  8 * modification, are permitted provided that the following conditions
  9 * are met:
 10 * 1. Redistributions of source code must retain the above copyright
 11 *    notice, this list of conditions and the following disclaimer.
 12 * 2. Redistributions in binary form must reproduce the above copyright
 13 *    notice, this list of conditions and the following disclaimer in the
 14 *    documentation and/or other materials provided with the distribution.
 15 * 3. Neither the name of the University nor the names of its contributors
 16 *    may be used to endorse or promote products derived from this software
 17 *    without specific prior written permission.
 18 *
 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 29 * SUCH DAMAGE.
 30 *
 31 *	@(#)profile.h	8.1 (Berkeley) 6/11/93
 32 */
 33
 34#ifdef _KERNEL
 35#include <machine/cpufunc.h>
 36#endif
 37
 38#define	_MCOUNT_DECL static __inline void _mcount
 39
 40#ifdef __ELF__
 41#define MCOUNT_ENTRY	"__mcount"
 42#define MCOUNT_COMPAT	__weak_alias(mcount, __mcount)
 43#else
 44#define MCOUNT_ENTRY	"mcount"
 45#define MCOUNT_COMPAT	/* nothing */
 46#endif
 47
 48#if defined(_REENTRANT) && !defined(_KERNEL) 
 49#define MCOUNT_ACTIVE	if (_gmonparam.state != GMON_PROF_ON) return
 50#else
 51#define MCOUNT_ACTIVE	
 52#endif
 53
 54#define	MCOUNT \
 55MCOUNT_COMPAT								\
 56extern void mcount(void) __asm(MCOUNT_ENTRY)				\
 57	__attribute__((__no_instrument_function__));			\
 58void									\
 59mcount(void)								\
 60{									\
 61	int selfpc, frompcindex;					\
 62	int eax, ecx, edx;						\
 63									\
 64	MCOUNT_ACTIVE;							\
 65	__asm volatile("movl %%eax,%0" : "=g" (eax));			\
 66	__asm volatile("movl %%ecx,%0" : "=g" (ecx));			\
 67	__asm volatile("movl %%edx,%0" : "=g" (edx));			\
 68	/*								\
 69	 * find the return address for mcount,				\
 70	 * and the return address for mcount's caller.			\
 71	 *								\
 72	 * selfpc = pc pushed by mcount call				\
 73	 */								\
 74	selfpc = (int)__builtin_return_address(0);			\
 75	/*								\
 76	 * frompcindex = stack frame of caller, assuming frame pointer	\
 77	 */								\
 78	frompcindex = ((int *)__builtin_frame_address(1))[1];		\
 79	_mcount((u_long)frompcindex, (u_long)selfpc);			\
 80									\
 81	__asm volatile("movl %0,%%edx" : : "g" (edx));			\
 82	__asm volatile("movl %0,%%ecx" : : "g" (ecx));			\
 83	__asm volatile("movl %0,%%eax" : : "g" (eax));			\
 84}
 85
 86#ifdef _KERNEL
 87static inline __always_inline void
 88mcount_disable_intr(void)
 89{
 90	__asm volatile("cli");
 91}
 92
 93static inline __always_inline u_long
 94mcount_read_psl(void)
 95{
 96	u_long	ef;
 97
 98	__asm volatile("pushfl; popl %0" : "=r" (ef));
 99	return (ef);
100}
101
102static inline __always_inline void
103mcount_write_psl(u_long ef)
104{
105	__asm volatile("pushl %0; popfl" : : "r" (ef));
106}
107
108#define MCOUNT_ENTER	\
109	do { s = (int)mcount_read_psl(); mcount_disable_intr(); } while (0)
110#define MCOUNT_EXIT	do { mcount_write_psl(s); } while (0)
111
112#endif /* _KERNEL */