Fix typos.
[dragonfly.git] / sys / i386 / include / asm.h
CommitLineData
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1/*-
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * William Jolitz.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * from: @(#)DEFS.h 5.1 (Berkeley) 4/23/90
37 * $FreeBSD: src/sys/i386/include/asm.h,v 1.7 2000/01/25 09:01:55 bde Exp $
aa8d5dcb 38 * $DragonFly: src/sys/i386/include/Attic/asm.h,v 1.3 2004/03/20 16:27:41 drhodus Exp $
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39 */
40
41#ifndef _MACHINE_ASM_H_
42#define _MACHINE_ASM_H_
43
44#include <sys/cdefs.h>
45
46#ifdef PIC
47#define PIC_PROLOGUE \
48 pushl %ebx; \
49 call 1f; \
501: \
51 popl %ebx; \
52 addl $_GLOBAL_OFFSET_TABLE_+[.-1b],%ebx
53#define PIC_EPILOGUE \
54 popl %ebx
55#define PIC_PLT(x) x@PLT
56#define PIC_GOT(x) x@GOT(%ebx)
57#define PIC_GOTOFF(x) x@GOTOFF(%ebx)
58#else
59#define PIC_PROLOGUE
60#define PIC_EPILOGUE
61#define PIC_PLT(x) x
62#define PIC_GOT(x) x
63#define PIC_GOTOFF(x) x
64#endif
65
66/*
67 * CNAME and HIDENAME manage the relationship between symbol names in C
68 * and the equivalent assembly language names. CNAME is given a name as
69 * it would be used in a C program. It expands to the equivalent assembly
70 * language name. HIDENAME is given an assembly-language name, and expands
71 * to a possibly-modified form that will be invisible to C programs.
72 */
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73#define CNAME(csym) csym
74#define HIDENAME(asmsym) __CONCAT(.,asmsym)
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75
76/* XXX should use .p2align 4,0x90 for -m486. */
77#define _START_ENTRY .text; .p2align 2,0x90
78
79#define _ENTRY(x) _START_ENTRY; \
80 .globl CNAME(x); .type CNAME(x),@function; CNAME(x):
81
82#ifdef PROF
83#define ALTENTRY(x) _ENTRY(x); \
84 pushl %ebp; movl %esp,%ebp; \
85 call PIC_PLT(HIDENAME(mcount)); \
86 popl %ebp; \
87 jmp 9f
88#define ENTRY(x) _ENTRY(x); \
89 pushl %ebp; movl %esp,%ebp; \
90 call PIC_PLT(HIDENAME(mcount)); \
91 popl %ebp; \
92 9:
93#else
94#define ALTENTRY(x) _ENTRY(x)
95#define ENTRY(x) _ENTRY(x)
96#endif
97
98#define RCSID(x) .text; .asciz x
99
100#ifdef _ARCH_INDIRECT
101/*
102 * Generate code to select between the generic functions and _ARCH_INDIRECT
103 * specific ones.
104 * XXX nested __CONCATs don't work with non-ANSI cpp's.
105 */
106#define ANAME(x) CNAME(__CONCAT(__CONCAT(__,_ARCH_INDIRECT),x))
107#define ASELNAME(x) CNAME(__CONCAT(__arch_select_,x))
108#define AVECNAME(x) CNAME(__CONCAT(__arch_,x))
109#define GNAME(x) CNAME(__CONCAT(__generic_,x))
110
111/* Don't bother profiling this. */
112#ifdef PIC
113#define ARCH_DISPATCH(x) \
114 _START_ENTRY; \
115 .globl CNAME(x); .type CNAME(x),@function; CNAME(x): ; \
116 PIC_PROLOGUE; \
117 movl PIC_GOT(AVECNAME(x)),%eax; \
118 PIC_EPILOGUE; \
119 jmpl *(%eax)
120
121#define ARCH_SELECT(x) _START_ENTRY; \
122 .type ASELNAME(x),@function; \
123 ASELNAME(x): \
124 PIC_PROLOGUE; \
125 call PIC_PLT(CNAME(__get_hw_float)); \
126 testl %eax,%eax; \
127 movl PIC_GOT(ANAME(x)),%eax; \
128 jne 8f; \
129 movl PIC_GOT(GNAME(x)),%eax; \
130 8: \
131 movl PIC_GOT(AVECNAME(x)),%edx; \
132 movl %eax,(%edx); \
133 PIC_EPILOGUE; \
134 jmpl *%eax
135#else /* !PIC */
136#define ARCH_DISPATCH(x) \
137 _START_ENTRY; \
138 .globl CNAME(x); .type CNAME(x),@function; CNAME(x): ; \
139 jmpl *AVECNAME(x)
140
141#define ARCH_SELECT(x) _START_ENTRY; \
142 .type ASELNAME(x),@function; \
143 ASELNAME(x): \
144 call CNAME(__get_hw_float); \
145 testl %eax,%eax; \
146 movl $ANAME(x),%eax; \
147 jne 8f; \
148 movl $GNAME(x),%eax; \
149 8: \
150 movl %eax,AVECNAME(x); \
151 jmpl *%eax
152#endif /* PIC */
153
154#define ARCH_VECTOR(x) .data; .p2align 2; \
155 .globl AVECNAME(x); \
156 .type AVECNAME(x),@object; \
157 .size AVECNAME(x),4; \
158 AVECNAME(x): .long ASELNAME(x)
159
160#undef _ENTRY
161#define _ENTRY(x) ARCH_VECTOR(x); ARCH_SELECT(x); ARCH_DISPATCH(x); \
162 _START_ENTRY; \
163 .globl ANAME(x); .type ANAME(x),@function; ANAME(x):
164
165#endif /* _ARCH_INDIRECT */
166
167#endif /* !_MACHINE_ASM_H_ */