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 * @(#)profile.h 8.1 (Berkeley) 6/11/93
32 * $FreeBSD$
33 */
34
35 #ifndef _MACHINE_PROFILE_H_
36 #define _MACHINE_PROFILE_H_
37
38 #ifndef _KERNEL
39
40 #include <sys/cdefs.h>
41
42 #define FUNCTION_ALIGNMENT 4
43
44 #define _MCOUNT_DECL static __inline void _mcount
45
46 #define MCOUNT \
47 void \
48 mcount() \
49 { \
50 uintfptr_t selfpc, frompc, ecx; \
51 /* \
52 * In gcc 4.2, ecx might be used in the caller as the arg \
53 * pointer if the stack realignment option is set (-mstackrealign) \
54 * or if the caller has the force_align_arg_pointer attribute \
55 * (stack realignment is ALWAYS on for main). Preserve ecx \
56 * here. \
57 */ \
58 __asm("" : "=c" (ecx)); \
59 /* \
60 * Find the return address for mcount, \
61 * and the return address for mcount's caller. \
62 * \
63 * selfpc = pc pushed by call to mcount \
64 */ \
65 __asm("movl 4(%%ebp),%0" : "=r" (selfpc)); \
66 /* \
67 * frompc = pc pushed by call to mcount's caller. \
68 * The caller's stack frame has already been built, so %ebp is \
69 * the caller's frame pointer. The caller's raddr is in the \
70 * caller's frame following the caller's caller's frame pointer.\
71 */ \
72 __asm("movl (%%ebp),%0" : "=r" (frompc)); \
73 frompc = ((uintfptr_t *)frompc)[1]; \
74 _mcount(frompc, selfpc); \
75 __asm("" : : "c" (ecx)); \
76 }
77
78 typedef u_int uintfptr_t;
79
80 /*
81 * An unsigned integral type that can hold non-negative difference between
82 * function pointers.
83 */
84 typedef u_int fptrdiff_t;
85
86 __BEGIN_DECLS
87 void mcount(void) __asm(".mcount");
88 __END_DECLS
89
90 #endif /* !_KERNEL */
91
92 #endif /* !_MACHINE_PROFILE_H_ */
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