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 * 4. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 *	from: @(#)DEFS.h	5.1 (Berkeley) 4/23/90
33 * $FreeBSD$
34 */
35
36#ifndef _MACHINE_ASM_H_
37#define	_MACHINE_ASM_H_
38
39#include <sys/cdefs.h>
40
41#ifdef PIC
42#define	PIC_PROLOGUE	\
43	pushl	%ebx;	\
44	call	1f;	\
451:			\
46	popl	%ebx;	\
47	addl	$_GLOBAL_OFFSET_TABLE_+[.-1b],%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_GOTOFF(x)	x
58#endif
59
60/*
61 * CNAME and HIDENAME manage the relationship between symbol names in C
62 * and the equivalent assembly language names.  CNAME is given a name as
63 * it would be used in a C program.  It expands to the equivalent assembly
64 * language name.  HIDENAME is given an assembly-language name, and expands
65 * to a possibly-modified form that will be invisible to C programs.
66 */
67#define CNAME(csym)		csym
68#define HIDENAME(asmsym)	.asmsym
69
70/* XXX should use .p2align 4,0x90 for -m486. */
71#define _START_ENTRY	.text; .p2align 2,0x90
72
73#define _ENTRY(x)	_START_ENTRY; \
74			.globl CNAME(x); .type CNAME(x),@function; CNAME(x):
75#define	END(x)		.size x, . - x
76
77#ifdef PROF
78#define	ALTENTRY(x)	_ENTRY(x); \
79			pushl %ebp; movl %esp,%ebp; \
80			call PIC_PLT(HIDENAME(mcount)); \
81			popl %ebp; \
82			jmp 9f
83#define	ENTRY(x)	_ENTRY(x); \
84			pushl %ebp; movl %esp,%ebp; \
85			call PIC_PLT(HIDENAME(mcount)); \
86			popl %ebp; \
87			9:
88#else
89#define	ALTENTRY(x)	_ENTRY(x)
90#define	ENTRY(x)	_ENTRY(x)
91#endif
92
93/*
94 * WEAK_REFERENCE(): create a weak reference alias from sym.
95 * The macro is not a general asm macro that takes arbitrary names,
96 * but one that takes only C names. It does the non-null name
97 * translation inside the macro.
98 */
99
100#define	WEAK_REFERENCE(sym, alias)					\
101	.weak CNAME(alias);						\
102	.equ CNAME(alias),CNAME(sym)
103
104/*
105 * STRONG_ALIAS: create a strong alias.
106 */
107#define	STRONG_ALIAS(alias,sym)						\
108	.globl alias;							\
109	alias = sym
110
111#define RCSID(x)	.text; .asciz x
112
113#undef __FBSDID
114#if !defined(lint) && !defined(STRIP_FBSDID)
115#define __FBSDID(s)	.ident s
116#else
117#define __FBSDID(s)	/* nothing */
118#endif /* not lint and not STRIP_FBSDID */
119
120#endif /* !_MACHINE_ASM_H_ */
121