1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
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
32#ifndef _MACHINE_PROFILE_H_
33#define	_MACHINE_PROFILE_H_
34
35#ifndef _KERNEL
36
37#include <sys/cdefs.h>
38
39#define	FUNCTION_ALIGNMENT	4
40
41#define	_MCOUNT_DECL static __inline void _mcount
42
43#define	MCOUNT								\
44void									\
45mcount()								\
46{									\
47	uintfptr_t selfpc, frompc, ecx;					\
48	/*								\
49	 * In gcc 4.2, ecx might be used in the caller as the arg	\
50	 * pointer if the stack realignment option is set (-mstackrealign) \
51	 * or if the caller has the force_align_arg_pointer attribute	\
52	 * (stack realignment is ALWAYS on for main).  Preserve ecx	\
53	 * here.							\
54	 */								\
55	__asm("" : "=c" (ecx));						\
56	/*								\
57	 * Find the return address for mcount,				\
58	 * and the return address for mcount's caller.			\
59	 *								\
60	 * selfpc = pc pushed by call to mcount				\
61	 */								\
62	__asm("movl 4(%%ebp),%0" : "=r" (selfpc));			\
63	/*								\
64	 * frompc = pc pushed by call to mcount's caller.		\
65	 * The caller's stack frame has already been built, so %ebp is	\
66	 * the caller's frame pointer.  The caller's raddr is in the	\
67	 * caller's frame following the caller's caller's frame pointer.\
68	 */								\
69	__asm("movl (%%ebp),%0" : "=r" (frompc));			\
70	frompc = ((uintfptr_t *)frompc)[1];				\
71	_mcount(frompc, selfpc);					\
72	__asm("" : : "c" (ecx));					\
73}
74
75typedef	u_int	uintfptr_t;
76
77/*
78 * An unsigned integral type that can hold non-negative difference between
79 * function pointers.
80 */
81typedef	u_int	fptrdiff_t;
82
83__BEGIN_DECLS
84void	mcount(void) __asm(".mcount");
85__END_DECLS
86
87#endif /* !_KERNEL */
88
89#endif /* !_MACHINE_PROFILE_H_ */
90