1/*	$NetBSD: asm.h,v 1.22 2021/04/17 20:12:55 rillig 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 _AMD64_ASM_H_
 38#define _AMD64_ASM_H_
 39
 40#ifdef __x86_64__
 41
 42#ifdef __PIC__
 43#define PIC_PLT(x)	x@PLT
 44#define PIC_GOT(x)	x@GOTPCREL(%rip)
 45#else
 46#define PIC_PLT(x)	x
 47#define PIC_GOT(x)	x
 48#endif
 49
 50#define _C_LABEL(x)	x
 51#define	_ASM_LABEL(x)	x
 52
 53#define CVAROFF(x,y)		(_C_LABEL(x)+y)(%rip)
 54
 55#ifdef __STDC__
 56# define __CONCAT(x,y)	x ## y
 57# define __STRING(x)	#x
 58#else
 59# define __CONCAT(x,y)	x/**/y
 60# define __STRING(x)	"x"
 61#endif
 62
 63/* let kernels and others override entrypoint alignment */
 64#ifndef _ALIGN_TEXT
 65# ifdef _STANDALONE
 66#  define _ALIGN_TEXT .align 4
 67# else
 68#  define _ALIGN_TEXT .align 16
 69# endif
 70#endif
 71
 72#define _ENTRY(x) \
 73	.text; _ALIGN_TEXT; .globl x; .type x,@function; x:
 74#define _LABEL(x) \
 75	.globl x; x:
 76
 77#ifdef _KERNEL
 78/* XXX Can't use __CONCAT() here, as it would be evaluated incorrectly. */
 79#ifdef __STDC__
 80#define	IDTVEC(name) \
 81	ALIGN_TEXT; .globl X ## name; .type X ## name,@function; X ## name:
 82#define	IDTVEC_END(name) \
 83	.size X ## name, . - X ## name
 84#else
 85#define	IDTVEC(name) \
 86	ALIGN_TEXT; .globl X/**/name; .type X/**/name,@function; X/**/name:
 87#define	IDTVEC_END(name) \
 88	.size X/**/name, . - X/**/name
 89#endif /* __STDC__ */
 90#endif /* _KERNEL */
 91
 92#ifdef __STDC__
 93#define CPUVAR(off)	%gs:CPU_INFO_ ## off
 94#else
 95#define CPUVAR(off)     %gs:CPU_INFO_/**/off
 96#endif
 97
 98
 99#ifdef GPROF
100# define _PROF_PROLOGUE	\
101	pushq %rbp; leaq (%rsp),%rbp; call PIC_PLT(__mcount); popq %rbp
102#else
103# define _PROF_PROLOGUE
104#endif
105
106#define	ENTRY(y)	_ENTRY(_C_LABEL(y)); _PROF_PROLOGUE
107#define	NENTRY(y)	_ENTRY(_C_LABEL(y))
108#define	ALTENTRY(x)	NENTRY(x)
109#define	ASENTRY(y)	_ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE
110#define	LABEL(y)	_LABEL(_C_LABEL(y))
111#define	END(y)		.size y, . - y
112
113#define	ASMSTR		.asciz
114
115#define RCSID(x)	.pushsection ".ident","MS",@progbits,1;		\
116			.asciz x;					\
117			.popsection
118
119#define	WEAK_ALIAS(alias,sym)						\
120	.weak alias;							\
121	alias = sym
122
123/*
124 * STRONG_ALIAS: create a strong alias.
125 */
126#define STRONG_ALIAS(alias,sym)						\
127	.globl alias;							\
128	alias = sym
129
130#ifdef __STDC__
131#define	WARN_REFERENCES(sym,msg)					\
132	.pushsection .gnu.warning. ## sym;				\
133	.ascii msg;							\
134	.popsection
135#else
136#define	WARN_REFERENCES(sym,msg)					\
137	.pushsection .gnu.warning./**/sym;				\
138	.ascii msg;							\
139	.popsection
140#endif /* __STDC__ */
141
142#else	/*	__x86_64__	*/
143
144#include <i386/asm.h>
145
146#endif	/*	__x86_64__	*/
147
148#endif /* !_AMD64_ASM_H_ */