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 _SYS_CDEFS_H_
39 #error this file needs sys/cdefs.h as a prerequisite
40 #endif
41
42 #ifdef _KERNEL
43
44 /*
45 * Config generates something to tell the compiler to align functions on 16
46 * byte boundaries. A strict alignment is good for keeping the tables small.
47 */
48 #define FUNCTION_ALIGNMENT 16
49
50 /*
51 * The kernel uses assembler stubs instead of unportable inlines.
52 * This is mainly to save a little time when profiling is not enabled,
53 * which is the usual case for the kernel.
54 */
55 #define _MCOUNT_DECL void mcount
56 #define MCOUNT
57
58 #ifdef GUPROF
59 #define MCOUNT_DECL(s)
60 #define MCOUNT_ENTER(s)
61 #define MCOUNT_EXIT(s)
62 #ifdef __GNUCLIKE_ASM
63 #define MCOUNT_OVERHEAD(label) \
64 __asm __volatile("pushl %0; call __mcount; popl %%ecx" \
65 : \
66 : "i" (label) \
67 : "ax", "dx", "cx", "memory")
68 #define MEXITCOUNT_OVERHEAD() \
69 __asm __volatile("call .mexitcount; 1:" \
70 : : \
71 : "cx", "memory")
72 #define MEXITCOUNT_OVERHEAD_GETLABEL(labelp) \
73 __asm __volatile("movl $1b,%0" : "=rm" (labelp))
74 #else
75 #error
76 #endif /* !__GNUCLIKE_ASM */
77 #else /* !GUPROF */
78 #define MCOUNT_DECL(s) register_t s;
79 #ifdef SMP
80 extern int mcount_lock;
81 #define MCOUNT_ENTER(s) { s = intr_disable(); \
82 while (!atomic_cmpset_acq_int(&mcount_lock, 0, 1)) \
83 /* nothing */ ; }
84 #define MCOUNT_EXIT(s) { atomic_store_rel_int(&mcount_lock, 0); \
85 intr_restore(s); }
86 #else
87 #define MCOUNT_ENTER(s) { s = intr_disable(); }
88 #define MCOUNT_EXIT(s) (intr_restore(s))
89 #endif
90 #endif /* GUPROF */
91
92 void bintr(void);
93 void btrap(void);
94 void eintr(void);
95 #if 0
96 void end_exceptions(void);
97 void start_exceptions(void);
98 #else
99 #include <machine/pmc_mdep.h> /* XXX */
100 #endif
101 void user(void);
102
103 #include <machine/md_var.h> /* XXX for setidt_disp */
104
105 #define MCOUNT_DETRAMP(pc) do { \
106 if ((pc) >= (uintfptr_t)start_exceptions + setidt_disp && \
107 (pc) < (uintfptr_t)end_exceptions + setidt_disp) \
108 (pc) -= setidt_disp; \
109 } while (0)
110
111 #define MCOUNT_FROMPC_INTR(pc) \
112 ((pc >= (uintfptr_t)btrap && pc < (uintfptr_t)eintr) ? \
113 ((pc >= (uintfptr_t)bintr) ? (uintfptr_t)bintr : \
114 (uintfptr_t)btrap) : ~0U)
115
116 #define MCOUNT_USERPC ((uintfptr_t)user)
117
118 #else /* !_KERNEL */
119
120 #define FUNCTION_ALIGNMENT 4
121
122 #define _MCOUNT_DECL static __inline void _mcount
123
124 #ifdef __GNUCLIKE_ASM
125 #define MCOUNT \
126 void \
127 mcount() \
128 { \
129 uintfptr_t selfpc, frompc, ecx; \
130 /* \
131 * In gcc 4.2, ecx might be used in the caller as the arg \
132 * pointer if the stack realignment option is set (-mstackrealign) \
133 * or if the caller has the force_align_arg_pointer attribute \
134 * (stack realignment is ALWAYS on for main). Preserve ecx \
135 * here. \
136 */ \
137 __asm("" : "=c" (ecx)); \
138 /* \
139 * Find the return address for mcount, \
140 * and the return address for mcount's caller. \
141 * \
142 * selfpc = pc pushed by call to mcount \
143 */ \
144 __asm("movl 4(%%ebp),%0" : "=r" (selfpc)); \
145 /* \
146 * frompc = pc pushed by call to mcount's caller. \
147 * The caller's stack frame has already been built, so %ebp is \
148 * the caller's frame pointer. The caller's raddr is in the \
149 * caller's frame following the caller's caller's frame pointer.\
150 */ \
151 __asm("movl (%%ebp),%0" : "=r" (frompc)); \
152 frompc = ((uintfptr_t *)frompc)[1]; \
153 _mcount(frompc, selfpc); \
154 __asm("" : : "c" (ecx)); \
155 }
156 #else /* !__GNUCLIKE_ASM */
157 #define MCOUNT
158 #endif /* __GNUCLIKE_ASM */
159
160 typedef u_int uintfptr_t;
161
162 #endif /* _KERNEL */
163
164 /*
165 * An unsigned integral type that can hold non-negative difference between
166 * function pointers.
167 */
168 typedef u_int fptrdiff_t;
169
170 #ifdef _KERNEL
171
172 void mcount(uintfptr_t frompc, uintfptr_t selfpc);
173
174 #else /* !_KERNEL */
175
176 #include <sys/cdefs.h>
177
178 __BEGIN_DECLS
179 #ifdef __GNUCLIKE_ASM
180 void mcount(void) __asm(".mcount");
181 #endif
182 __END_DECLS
183
184 #endif /* _KERNEL */
185
186 #endif /* !_MACHINE_PROFILE_H_ */
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