1 /*
2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)profile.h 8.1 (Berkeley) 6/11/93
30 * $FreeBSD: releng/5.3/sys/i386/include/profile.h 129498 2004-05-20 16:12:19Z bde $
31 */
32
33 #ifndef _MACHINE_PROFILE_H_
34 #define _MACHINE_PROFILE_H_
35
36 #ifdef _KERNEL
37
38 /*
39 * Config generates something to tell the compiler to align functions on 16
40 * byte boundaries. A strict alignment is good for keeping the tables small.
41 */
42 #define FUNCTION_ALIGNMENT 16
43
44 /*
45 * The kernel uses assembler stubs instead of unportable inlines.
46 * This is mainly to save a little time when profiling is not enabled,
47 * which is the usual case for the kernel.
48 */
49 #define _MCOUNT_DECL void mcount
50 #define MCOUNT
51
52 #ifdef GUPROF
53 #define MCOUNT_DECL(s)
54 #define MCOUNT_ENTER(s)
55 #define MCOUNT_EXIT(s)
56 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
57 #define MCOUNT_OVERHEAD(label) \
58 __asm __volatile("pushl %0; call __mcount; popl %%ecx" \
59 : \
60 : "i" (profil) \
61 : "ax", "dx", "cx", "memory")
62 #define MEXITCOUNT_OVERHEAD() \
63 __asm __volatile("call .mexitcount; 1:" \
64 : : \
65 : "ax", "dx", "cx", "memory")
66 #define MEXITCOUNT_OVERHEAD_GETLABEL(labelp) \
67 __asm __volatile("movl $1b,%0" : "=rm" (labelp))
68 #elif defined(lint)
69 #define MCOUNT_OVERHEAD(label)
70 #define MEXITCOUNT_OVERHEAD()
71 #define MEXITCOUNT_OVERHEAD_GETLABEL()
72 #else
73 #error
74 #endif /* !(__GNUC__ || __INTEL_COMPILER) */
75 #else /* !GUPROF */
76 #define MCOUNT_DECL(s) u_long s;
77 #ifdef SMP
78 extern int mcount_lock;
79 #define MCOUNT_ENTER(s) { s = read_eflags(); disable_intr(); \
80 while (!atomic_cmpset_acq_int(&mcount_lock, 0, 1)) \
81 /* nothing */ ; }
82 #define MCOUNT_EXIT(s) { atomic_store_rel_int(&mcount_lock, 0); \
83 write_eflags(s); }
84 #else
85 #define MCOUNT_ENTER(s) { s = read_eflags(); disable_intr(); }
86 #define MCOUNT_EXIT(s) (write_eflags(s))
87 #endif
88 #endif /* GUPROF */
89
90 #else /* !_KERNEL */
91
92 #define FUNCTION_ALIGNMENT 4
93
94 #define _MCOUNT_DECL static __inline void _mcount
95
96 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
97 #define MCOUNT \
98 void \
99 mcount() \
100 { \
101 uintfptr_t selfpc, frompc; \
102 /* \
103 * Find the return address for mcount, \
104 * and the return address for mcount's caller. \
105 * \
106 * selfpc = pc pushed by call to mcount \
107 */ \
108 __asm("movl 4(%%ebp),%0" : "=r" (selfpc)); \
109 /* \
110 * frompc = pc pushed by call to mcount's caller. \
111 * The caller's stack frame has already been built, so %ebp is \
112 * the caller's frame pointer. The caller's raddr is in the \
113 * caller's frame following the caller's caller's frame pointer.\
114 */ \
115 __asm("movl (%%ebp),%0" : "=r" (frompc)); \
116 frompc = ((uintfptr_t *)frompc)[1]; \
117 _mcount(frompc, selfpc); \
118 }
119 #else /* !(__GNUC__ || __INTEL_COMPILER) */
120 void \
121 #define MCOUNT \
122 mcount() \
123 { \
124 }
125 #endif /* __GNUC__ || __INTEL_COMPILER */
126
127 typedef u_int uintfptr_t;
128
129 #endif /* _KERNEL */
130
131 /*
132 * An unsigned integral type that can hold non-negative difference between
133 * function pointers.
134 */
135 typedef u_int fptrdiff_t;
136
137 #ifdef _KERNEL
138
139 void mcount(uintfptr_t frompc, uintfptr_t selfpc);
140
141 #else /* !_KERNEL */
142
143 #include <sys/cdefs.h>
144
145 __BEGIN_DECLS
146 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
147 void mcount(void) __asm(".mcount");
148 #endif
149 __END_DECLS
150
151 #endif /* _KERNEL */
152
153 #endif /* !_MACHINE_PROFILE_H_ */
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