1/* $OpenBSD: asm.h,v 1.19 2022/12/08 01:25:45 guenther Exp $ */
2/* $NetBSD: asm.h,v 1.7 1994/10/27 04:15:56 cgd Exp $ */
3
4/*-
5 * Copyright (c) 1990 The Regents of the University of California.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * William Jolitz.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * @(#)asm.h 5.5 (Berkeley) 5/7/91
36 */
37
38#ifndef _MACHINE_ASM_H_
39#define _MACHINE_ASM_H_
40
41#ifdef __PIC__
42#define PIC_PROLOGUE \
43 pushl %ebx; \
44 call 666f; \
45666: \
46 popl %ebx; \
47 addl $_GLOBAL_OFFSET_TABLE_+[.-666b], %ebx
48#define PIC_EPILOGUE \
49 popl %ebx
50#define PIC_PLT(x) x@PLT
51#define PIC_GOT(x) x@GOT(%ebx)
52#define PIC_GOTOFF(x) x@GOTOFF(%ebx)
53#else
54#define PIC_PROLOGUE
55#define PIC_EPILOGUE
56#define PIC_PLT(x) x
57#define PIC_GOT(x) x
58#define PIC_GOTOFF(x) x
59#endif
60
61#define _C_LABEL(name) name
62#define _ASM_LABEL(x) x
63
64#define CVAROFF(x, y) x + y
65
66#ifdef __STDC__
67# define __CONCAT(x,y) x ## y
68# define __STRING(x) #x
69#else
70# define __CONCAT(x,y) x/**/y
71# define __STRING(x) "x"
72#endif
73
74/*
75 * STRONG_ALIAS, WEAK_ALIAS
76 * Create a strong or weak alias.
77 */
78#define STRONG_ALIAS(alias,sym) \
79 .global alias; \
80 alias = sym
81#define WEAK_ALIAS(alias,sym) \
82 .weak alias; \
83 alias = sym
84
85/* let kernels and others override entrypoint alignment */
86#ifndef _ALIGN_TEXT
87# define _ALIGN_TEXT .align 2, 0x90
88#endif
89
90/* NB == No Binding: use .globl or .weak as necessary */
91#define _ENTRY_NB(x) \
92 .text; _ALIGN_TEXT; .type x,@function; x:
93#define _ENTRY(x) .globl x; _ENTRY_NB(x)
94
95#ifdef _KERNEL
96#define KUTEXT .section .kutext, "ax"
97
98#define IDTVEC(name) \
99 KUTEXT; ALIGN_TEXT; \
100 .globl X##name; X##name:
101#define KIDTVEC(name) \
102 .text; ALIGN_TEXT; \
103 .globl X##name; X##name:
104#define KUENTRY(x) \
105 KUTEXT; _ALIGN_TEXT; .globl x; .type x,@function; x:
106
107#endif /* _KERNEL */
108
109#if defined(PROF) || defined(GPROF)
110# define _PROF_PROLOGUE \
111 pushl %ebp; movl %esp,%ebp; call PIC_PLT(mcount); popl %ebp
112#else
113# define _PROF_PROLOGUE
114#endif
115
116#define ENTRY(y) _ENTRY(y); _PROF_PROLOGUE
117#define ENTRY_NB(y) _ENTRY_NB(y); _PROF_PROLOGUE
118#define NENTRY(y) _ENTRY(y)
119#define ASENTRY(y) _ENTRY(y); _PROF_PROLOGUE
120#define NASENTRY(y) _ENTRY(y)
121#define END(y) .size y, . - y
122
123#define ALTENTRY(name) .globl name; name:
124
125#ifdef _KERNEL
126
127#define CPUVAR(var) %fs:__CONCAT(CPU_INFO_,var)
128
129#endif /* _KERNEL */
130
131#endif /* !_MACHINE_ASM_H_ */