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