FreeBSD/Linux Kernel Cross Reference
sys/i386/include/asm.h
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 1.2.2.2 1999/09/05 08:11:37 peter Exp $
38 */
39
40 #ifndef _MACHINE_ASM_H_
41 #define _MACHINE_ASM_H_
42
43 #include <sys/cdefs.h>
44
45 #ifdef PIC
46 #define PIC_PROLOGUE \
47 pushl %ebx; \
48 call 1f; \
49 1: \
50 popl %ebx; \
51 addl $_GLOBAL_OFFSET_TABLE_+[.-1b],%ebx
52 #define PIC_EPILOGUE \
53 popl %ebx
54 #define PIC_PLT(x) x@PLT
55 #define PIC_GOT(x) x@GOT(%ebx)
56 #define PIC_GOTOFF(x) x@GOTOFF(%ebx)
57 #else
58 #define PIC_PROLOGUE
59 #define PIC_EPILOGUE
60 #define PIC_PLT(x) x
61 #define PIC_GOT(x) x
62 #define PIC_GOTOFF(x) x
63 #endif
64
65 /*
66 * CNAME and HIDENAME manage the relationship between symbol names in C
67 * and the equivalent assembly language names. CNAME is given a name as
68 * it would be used in a C program. It expands to the equivalent assembly
69 * language name. HIDENAME is given an assembly-language name, and expands
70 * to a possibly-modified form that will be invisible to C programs.
71 */
72 #if defined(__ELF__) /* { */
73 #define CNAME(csym) csym
74 #define HIDENAME(asmsym) __CONCAT(.,asmsym)
75 #else /* } { */
76 #define CNAME(csym) __CONCAT(_,csym)
77 #define HIDENAME(asmsym) asmsym
78 #endif /* } */
79
80
81 /* XXX should use align 4,0x90 for -m486. */
82 #define _START_ENTRY .text; .p2align 2,0x90
83
84 #define _ENTRY(x) _START_ENTRY; \
85 .globl CNAME(x); .type CNAME(x),@function; CNAME(x):
86
87 #ifdef PROF
88 #define ENTRY(x) _ENTRY(x); \
89 pushl %ebp; movl %esp,%ebp; \
90 call PIC_PLT(HIDENAME(mcount)); \
91 popl %ebp
92 #else
93 #define ENTRY(x) _ENTRY(x)
94 #endif
95
96 #define RCSID(x) .text; .asciz x
97
98 #ifdef _ARCH_INDIRECT
99 /*
100 * Generate code to select between the generic functions and _ARCH_INDIRECT
101 * specific ones.
102 * XXX nested __CONCATs don't work with non-ANSI cpp's.
103 */
104 #define ANAME(x) CNAME(__CONCAT(__CONCAT(__,_ARCH_INDIRECT),x))
105 #define ASELNAME(x) CNAME(__CONCAT(__arch_select_,x))
106 #define AVECNAME(x) CNAME(__CONCAT(__arch_,x))
107 #define GNAME(x) CNAME(__CONCAT(__generic_,x))
108
109 /* Don't bother profiling this. */
110 #ifdef PIC
111 #define ARCH_DISPATCH(x) \
112 _START_ENTRY; \
113 .globl CNAME(x); .type CNAME(x),@function; CNAME(x): ; \
114 PIC_PROLOGUE; \
115 movl PIC_GOT(AVECNAME(x)),%eax; \
116 PIC_EPILOGUE; \
117 jmpl *(%eax)
118
119 #define ARCH_SELECT(x) _START_ENTRY; \
120 .type ASELNAME(x),@function; \
121 ASELNAME(x): \
122 PIC_PROLOGUE; \
123 call PIC_PLT(CNAME(__get_hw_float)); \
124 testl %eax,%eax; \
125 movl PIC_GOT(ANAME(x)),%eax; \
126 jne 8f; \
127 movl PIC_GOT(GNAME(x)),%eax; \
128 8: \
129 movl PIC_GOT(AVECNAME(x)),%edx; \
130 movl %eax,(%edx); \
131 PIC_EPILOGUE; \
132 jmpl *%eax
133 #else /* !PIC */
134 #define ARCH_DISPATCH(x) \
135 _START_ENTRY; \
136 .globl CNAME(x); .type CNAME(x),@function; CNAME(x): ; \
137 jmpl *AVECNAME(x)
138
139 #define ARCH_SELECT(x) _START_ENTRY; \
140 .type ASELNAME(x),@function; \
141 ASELNAME(x): \
142 call CNAME(__get_hw_float); \
143 testl %eax,%eax; \
144 movl $ANAME(x),%eax; \
145 jne 8f; \
146 movl $GNAME(x),%eax; \
147 8: \
148 movl %eax,AVECNAME(x); \
149 jmpl *%eax
150 #endif /* PIC */
151
152 #define ARCH_VECTOR(x) .data; .align 2; \
153 .globl AVECNAME(x); \
154 .type AVECNAME(x),@object; \
155 .size AVECNAME(x),4; \
156 AVECNAME(x): .long ASELNAME(x)
157
158 #undef _ENTRY
159 #define _ENTRY(x) ARCH_VECTOR(x); ARCH_SELECT(x); ARCH_DISPATCH(x); \
160 _START_ENTRY; \
161 .globl ANAME(x); .type ANAME(x),@function; ANAME(x):
162
163 #endif /* _ARCH_INDIRECT */
164
165 #endif /* !_MACHINE_ASM_H_ */
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