xref: /freebsd/sys/amd64/include/profile.h (revision 031beb4e239bfce798af17f5fe8dba8bcaf13d99)
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  */
33 
34 #ifdef __i386__
35 #include <i386/profile.h>
36 #else /* !__i386__ */
37 
38 #ifndef _MACHINE_PROFILE_H_
39 #define	_MACHINE_PROFILE_H_
40 
41 #ifndef _KERNEL
42 
43 #include <sys/cdefs.h>
44 
45 #define	FUNCTION_ALIGNMENT	4
46 
47 #define	_MCOUNT_DECL \
48 static void _mcount(uintfptr_t frompc, uintfptr_t selfpc) __used; \
49 static void _mcount
50 
51 #define	MCOUNT __asm("			\n\
52 	.text				\n\
53 	.p2align 4,0x90			\n\
54 	.globl	.mcount			\n\
55 	.type	.mcount,@function	\n\
56 .mcount:				\n\
57 	pushq	%rdi			\n\
58 	pushq	%rsi			\n\
59 	pushq	%rdx			\n\
60 	pushq	%rcx			\n\
61 	pushq	%r8			\n\
62 	pushq	%r9			\n\
63 	pushq	%rax			\n\
64 	movq	8(%rbp),%rdi		\n\
65 	movq	7*8(%rsp),%rsi		\n\
66 	call	_mcount			\n\
67 	popq	%rax			\n\
68 	popq	%r9			\n\
69 	popq	%r8			\n\
70 	popq	%rcx			\n\
71 	popq	%rdx			\n\
72 	popq	%rsi			\n\
73 	popq	%rdi			\n\
74 	ret				\n\
75 	.size	.mcount, . - .mcount");
76 #if 0
77 /*
78  * We could use this, except it doesn't preserve the registers that were
79  * being passed with arguments to the function that we were inserted
80  * into.  I've left it here as documentation of what the code above is
81  * supposed to do.
82  */
83 #define	MCOUNT								\
84 void									\
85 mcount()								\
86 {									\
87 	uintfptr_t selfpc, frompc;					\
88 	/*								\
89 	 * Find the return address for mcount,				\
90 	 * and the return address for mcount's caller.			\
91 	 *								\
92 	 * selfpc = pc pushed by call to mcount				\
93 	 */								\
94 	__asm("movq 8(%%rbp),%0" : "=r" (selfpc));			\
95 	/*								\
96 	 * frompc = pc pushed by call to mcount's caller.		\
97 	 * The caller's stack frame has already been built, so %rbp is	\
98 	 * the caller's frame pointer.  The caller's raddr is in the	\
99 	 * caller's frame following the caller's caller's frame pointer.\
100 	 */								\
101 	__asm("movq (%%rbp),%0" : "=r" (frompc));			\
102 	frompc = ((uintfptr_t *)frompc)[1];				\
103 	_mcount(frompc, selfpc);					\
104 }
105 #endif
106 
107 typedef	u_long	uintfptr_t;
108 
109 /*
110  * An unsigned integral type that can hold non-negative difference between
111  * function pointers.
112  */
113 typedef	u_long	fptrdiff_t;
114 
115 __BEGIN_DECLS
116 void	mcount(void) __asm(".mcount");
117 __END_DECLS
118 
119 #endif /* !_KERNEL */
120 
121 #endif /* !_MACHINE_PROFILE_H_ */
122 
123 #endif /* __i386__ */
124