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;	\
471:			\
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#define	END(x)		.size x, . - x
78
79#ifdef PROF
80#define	ALTENTRY(x)	_ENTRY(x); \
81			pushl %ebp; movl %esp,%ebp; \
82			call PIC_PLT(HIDENAME(mcount)); \
83			popl %ebp; \
84			jmp 9f
85#define	ENTRY(x)	_ENTRY(x); \
86			pushl %ebp; movl %esp,%ebp; \
87			call PIC_PLT(HIDENAME(mcount)); \
88			popl %ebp; \
89			9:
90#else
91#define	ALTENTRY(x)	_ENTRY(x)
92#define	ENTRY(x)	_ENTRY(x)
93#endif
94
95/*
96 * WEAK_REFERENCE(): create a weak reference alias from sym.
97 * The macro is not a general asm macro that takes arbitrary names,
98 * but one that takes only C names. It does the non-null name
99 * translation inside the macro.
100 */
101
102#define	WEAK_REFERENCE(sym, alias)					\
103	.weak CNAME(alias);						\
104	.equ CNAME(alias),CNAME(sym)
105
106/*
107 * STRONG_ALIAS: create a strong alias.
108 */
109#define	STRONG_ALIAS(alias,sym)						\
110	.globl alias;							\
111	alias = sym
112
113#define RCSID(x)	.text; .asciz x
114
115#undef __FBSDID
116#if !defined(STRIP_FBSDID)
117#define __FBSDID(s)	.ident s
118#else
119#define __FBSDID(s)	/* nothing */
120#endif /* not STRIP_FBSDID */
121
122#endif /* !_MACHINE_ASM_H_ */
123