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 */
 36
 37#ifndef _MACHINE_ASM_H_
 38#define	_MACHINE_ASM_H_
 39
 40#include <sys/cdefs.h>
 41
 42#ifdef PIC
 43#define	PIC_PROLOGUE	\
 44	pushl	%ebx;	\
 45	call	1f;	\
 461:			\
 47	popl	%ebx;	\
 48	addl	$_GLOBAL_OFFSET_TABLE_+[.-1b],%ebx
 49#define	PIC_EPILOGUE	\
 50	popl	%ebx
 51#define	PIC_PLT(x)	x@PLT
 52#define	PIC_GOT(x)	x@GOT(%ebx)
 53#define	PIC_GOTOFF(x)	x@GOTOFF(%ebx)
 54#else
 55#define	PIC_PROLOGUE
 56#define	PIC_EPILOGUE
 57#define	PIC_PLT(x)	x
 58#define	PIC_GOTOFF(x)	x
 59#endif
 60
 61/*
 62 * CNAME and HIDENAME manage the relationship between symbol names in C
 63 * and the equivalent assembly language names.  CNAME is given a name as
 64 * it would be used in a C program.  It expands to the equivalent assembly
 65 * language name.  HIDENAME is given an assembly-language name, and expands
 66 * to a possibly-modified form that will be invisible to C programs.
 67 */
 68#define CNAME(csym)		csym
 69#define HIDENAME(asmsym)	.asmsym
 70
 71/* XXX should use .p2align 4,0x90 for -m486. */
 72#define _START_ENTRY	.text; .p2align 2,0x90
 73
 74#define _ENTRY(x)	_START_ENTRY; \
 75			.globl CNAME(x); .type CNAME(x),@function; CNAME(x): \
 76			.cfi_startproc
 77#define	END(x)		.cfi_endproc; .size x, . - x
 78
 79#ifdef PROF
 80#define	ALTENTRY(x)	_ENTRY(x); \
 81			pushl %ebp; \
 82			.cfi_def_cfa_offset 8; \
 83			.cfi_offset %ebp, -8; \
 84			movl %esp,%ebp; \
 85			call PIC_PLT(HIDENAME(mcount)); \
 86			popl %ebp; \
 87			.cfi_restore %ebp; \
 88			.cfi_def_cfa_offset 4; \
 89			jmp 9f
 90#define	ENTRY(x)	_ENTRY(x); \
 91			pushl %ebp; \
 92			.cfi_def_cfa_offset 8; \
 93			.cfi_offset %ebp, -8; \
 94			movl %esp,%ebp; \
 95			call PIC_PLT(HIDENAME(mcount)); \
 96			popl %ebp; \
 97			.cfi_restore %ebp; \
 98			.cfi_def_cfa_offset 4; \
 99			9:
100#else
101#define	ALTENTRY(x)	_ENTRY(x)
102#define	ENTRY(x)	_ENTRY(x)
103#endif
104
105/*
106 * WEAK_REFERENCE(): create a weak reference alias from sym.
107 * The macro is not a general asm macro that takes arbitrary names,
108 * but one that takes only C names. It does the non-null name
109 * translation inside the macro.
110 */
111
112#define	WEAK_REFERENCE(sym, alias)					\
113	.weak CNAME(alias);						\
114	.equ CNAME(alias),CNAME(sym)
115
116/*
117 * STRONG_ALIAS: create a strong alias.
118 */
119#define	STRONG_ALIAS(alias,sym)						\
120	.globl alias;							\
121	alias = sym
122
123#define RCSID(x)	.text; .asciz x
124
125#undef __FBSDID
126#if !defined(STRIP_FBSDID)
127#define __FBSDID(s)	.ident s
128#else
129#define __FBSDID(s)	/* nothing */
130#endif /* not STRIP_FBSDID */
131
132#endif /* !_MACHINE_ASM_H_ */