1/*	$NetBSD: asm.h,v 1.44 2020/04/25 15:26:17 bouyer Exp $	*/
  2
  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 *	@(#)asm.h	5.5 (Berkeley) 5/7/91
 35 */
 36
 37#ifndef _I386_ASM_H_
 38#define _I386_ASM_H_
 39
 40#ifdef _KERNEL_OPT
 41#include "opt_multiprocessor.h"
 42#endif
 43
 44#ifdef __PIC__
 45#define PIC_PROLOGUE	\
 46	pushl	%ebx;	\
 47	call	1f;	\
 481:			\
 49	popl	%ebx;	\
 50	addl	$_GLOBAL_OFFSET_TABLE_+[.-1b], %ebx
 51#define PIC_EPILOGUE	\
 52	popl	%ebx
 53#define PIC_PLT(x)	x@PLT
 54#define PIC_GOT(x)	x@GOT(%ebx)
 55#define PIC_GOTOFF(x)	x@GOTOFF(%ebx)
 56#else
 57#define PIC_PROLOGUE
 58#define PIC_EPILOGUE
 59#define PIC_PLT(x)	x
 60#define PIC_GOT(x)	x
 61#define PIC_GOTOFF(x)	x
 62#endif
 63
 64#ifdef __ELF__
 65# define _C_LABEL(x)	x
 66#else
 67# ifdef __STDC__
 68#  define _C_LABEL(x)	_ ## x
 69# else
 70#  define _C_LABEL(x)	_/**/x
 71# endif
 72#endif
 73#define	_ASM_LABEL(x)	x
 74
 75#define CVAROFF(x, y)		_C_LABEL(x) + y
 76
 77#ifdef __STDC__
 78# define __CONCAT(x,y)	x ## y
 79# define __STRING(x)	#x
 80#else
 81# define __CONCAT(x,y)	x/**/y
 82# define __STRING(x)	"x"
 83#endif
 84
 85/* let kernels and others override entrypoint alignment */
 86#if !defined(_ALIGN_TEXT) && !defined(_KERNEL)
 87# ifdef _STANDALONE
 88#  define _ALIGN_TEXT .align 1
 89# elif defined __ELF__
 90#  define _ALIGN_TEXT .align 16
 91# else
 92#  define _ALIGN_TEXT .align 4
 93# endif
 94#endif
 95
 96#define _ENTRY(x) \
 97	.text; _ALIGN_TEXT; .globl x; .type x,@function; x:
 98#define _LABEL(x) \
 99	.globl x; x:
100
101#ifdef _KERNEL
102
103#define CPUVAR(off) %fs:__CONCAT(CPU_INFO_,off)
104
105/* XXX Can't use __CONCAT() here, as it would be evaluated incorrectly. */
106#ifdef __ELF__
107#ifdef __STDC__
108#define	IDTVEC(name) \
109	ALIGN_TEXT; .globl X ## name; .type X ## name,@function; X ## name:
110#define	IDTVEC_END(name) \
111	.size X ## name, . - X ## name
112#else 
113#define	IDTVEC(name) \
114	ALIGN_TEXT; .globl X/**/name; .type X/**/name,@function; X/**/name:
115#define	IDTVEC_END(name) \
116	.size X/**/name, . - X/**/name
117#endif /* __STDC__ */ 
118#else 
119#ifdef __STDC__
120#define	IDTVEC(name) \
121	ALIGN_TEXT; .globl _X ## name; .type _X ## name,@function; _X ## name: 
122#define	IDTVEC_END(name) \
123	.size _X ## name, . - _X ## name
124#else
125#define	IDTVEC(name) \
126	ALIGN_TEXT; .globl _X/**/name; .type _X/**/name,@function; _X/**/name:
127#define	IDTVEC_END(name) \
128	.size _X/**/name, . - _X/**/name
129#endif /* __STDC__ */
130#endif /* __ELF__ */
131
132#ifdef _STANDALONE
133#define ALIGN_DATA	.align	4
134#define ALIGN_TEXT	.align	4	/* 4-byte boundaries */
135#define SUPERALIGN_TEXT	.align	16	/* 15-byte boundaries */
136#elif defined __ELF__
137#define ALIGN_DATA	.align	4
138#define ALIGN_TEXT	.align	16	/* 16-byte boundaries */
139#define SUPERALIGN_TEXT	.align	16	/* 16-byte boundaries */
140#else
141#define ALIGN_DATA	.align	2
142#define ALIGN_TEXT	.align	4	/* 16-byte boundaries */
143#define SUPERALIGN_TEXT	.align	4	/* 16-byte boundaries */
144#endif /* __ELF__ */
145
146#define _ALIGN_TEXT ALIGN_TEXT
147
148#ifdef GPROF
149#ifdef __ELF__
150#define	MCOUNT_ASM	call	_C_LABEL(__mcount)
151#else /* __ELF__ */
152#define	MCOUNT_ASM	call	_C_LABEL(mcount)
153#endif /* __ELF__ */
154#else /* GPROF */
155#define	MCOUNT_ASM	/* nothing */
156#endif /* GPROF */
157
158#endif /* _KERNEL */
159
160
161
162#ifdef GPROF
163# ifdef __ELF__
164#  define _PROF_PROLOGUE	\
165	pushl %ebp; movl %esp,%ebp; call PIC_PLT(__mcount); popl %ebp
166# else 
167#  define _PROF_PROLOGUE	\
168	pushl %ebp; movl %esp,%ebp; call PIC_PLT(mcount); popl %ebp
169# endif
170#else
171# define _PROF_PROLOGUE
172#endif
173
174#define	ENTRY(y)	_ENTRY(_C_LABEL(y)); _PROF_PROLOGUE
175#define	NENTRY(y)	_ENTRY(_C_LABEL(y))
176#define	ALTENTRY(x)	NENTRY(x)
177#define	ASENTRY(y)	_ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE
178#define	LABEL(y)	_LABEL(_C_LABEL(y))
179#define	END(y)		.size y, . - y
180
181#define	ASMSTR		.asciz
182
183#ifdef __ELF__
184#define RCSID(x)	.pushsection ".ident","MS",@progbits,1;		\
185			.asciz x;					\
186			.popsection
187#else
188#define RCSID(x)	.text; .asciz x
189#endif
190
191#ifdef NO_KERNEL_RCSIDS
192#define	__KERNEL_RCSID(_n, _s)	/* nothing */
193#else
194#define	__KERNEL_RCSID(_n, _s)	RCSID(_s)
195#endif
196
197#ifdef __ELF__
198#define	WEAK_ALIAS(alias,sym)						\
199	.weak alias;							\
200	alias = sym
201#endif
202/*
203 * STRONG_ALIAS: create a strong alias.
204 */
205#define STRONG_ALIAS(alias,sym)						\
206	.globl alias;							\
207	alias = sym
208
209#ifdef __STDC__
210#define	WARN_REFERENCES(sym,msg)					\
211	.pushsection .gnu.warning. ## sym;				\
212	.ascii msg;							\
213	.popsection
214#else
215#define	WARN_REFERENCES(sym,msg)					\
216	.pushsection .gnu.warning./**/sym;				\
217	.ascii msg;							\
218	.popsection
219#endif /* __STDC__ */
220
221#endif /* !_I386_ASM_H_ */