FreeBSD/Linux Kernel Cross Reference
sys/i386/include/asm.h
1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1990 The Regents of the University of California.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * William Jolitz.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * from: @(#)DEFS.h 5.1 (Berkeley) 4/23/90
35 * $FreeBSD$
36 */
37
38 #ifndef _MACHINE_ASM_H_
39 #define _MACHINE_ASM_H_
40
41 #include <sys/cdefs.h>
42
43 #ifdef PIC
44 #define PIC_PROLOGUE \
45 pushl %ebx; \
46 call 1f; \
47 1: \
48 popl %ebx; \
49 addl $_GLOBAL_OFFSET_TABLE_+[.-1b],%ebx
50 #define PIC_EPILOGUE \
51 popl %ebx
52 #define PIC_PLT(x) x@PLT
53 #define PIC_GOT(x) x@GOT(%ebx)
54 #define PIC_GOTOFF(x) x@GOTOFF(%ebx)
55 #else
56 #define PIC_PROLOGUE
57 #define PIC_EPILOGUE
58 #define PIC_PLT(x) x
59 #define PIC_GOTOFF(x) x
60 #endif
61
62 /*
63 * CNAME and HIDENAME manage the relationship between symbol names in C
64 * and the equivalent assembly language names. CNAME is given a name as
65 * it would be used in a C program. It expands to the equivalent assembly
66 * language name. HIDENAME is given an assembly-language name, and expands
67 * to a possibly-modified form that will be invisible to C programs.
68 */
69 #define CNAME(csym) csym
70 #define HIDENAME(asmsym) .asmsym
71
72 /* XXX should use .p2align 4,0x90 for -m486. */
73 #define _START_ENTRY .text; .p2align 2,0x90
74
75 #define _ENTRY(x) _START_ENTRY; \
76 .globl CNAME(x); .type CNAME(x),@function; CNAME(x): \
77 .cfi_startproc
78 #define END(x) .cfi_endproc; .size x, . - x
79
80 #ifdef PROF
81 #define ALTENTRY(x) _ENTRY(x); \
82 pushl %ebp; \
83 .cfi_def_cfa_offset 8; \
84 .cfi_offset %ebp, -8; \
85 movl %esp,%ebp; \
86 call PIC_PLT(HIDENAME(mcount)); \
87 popl %ebp; \
88 .cfi_restore %ebp; \
89 .cfi_def_cfa_offset 4; \
90 jmp 9f
91 #define ENTRY(x) _ENTRY(x); \
92 pushl %ebp; \
93 .cfi_def_cfa_offset 8; \
94 .cfi_offset %ebp, -8; \
95 movl %esp,%ebp; \
96 call PIC_PLT(HIDENAME(mcount)); \
97 popl %ebp; \
98 .cfi_restore %ebp; \
99 .cfi_def_cfa_offset 4; \
100 9:
101 #else
102 #define ALTENTRY(x) _ENTRY(x)
103 #define ENTRY(x) _ENTRY(x)
104 #endif
105
106 /*
107 * WEAK_REFERENCE(): create a weak reference alias from sym.
108 * The macro is not a general asm macro that takes arbitrary names,
109 * but one that takes only C names. It does the non-null name
110 * translation inside the macro.
111 */
112
113 #define WEAK_REFERENCE(sym, alias) \
114 .weak CNAME(alias); \
115 .equ CNAME(alias),CNAME(sym)
116
117 /*
118 * STRONG_ALIAS: create a strong alias.
119 */
120 #define STRONG_ALIAS(alias,sym) \
121 .globl alias; \
122 alias = sym
123
124 #define RCSID(x) .text; .asciz x
125
126 #undef __FBSDID
127 #if !defined(STRIP_FBSDID)
128 #define __FBSDID(s) .ident s
129 #else
130 #define __FBSDID(s) /* nothing */
131 #endif /* not STRIP_FBSDID */
132
133 #endif /* !_MACHINE_ASM_H_ */
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