/*      $OpenBSD: asm.h,v 1.19 2022/12/08 01:25:45 guenther Exp $       */
/*      $NetBSD: asm.h,v 1.7 1994/10/27 04:15:56 cgd Exp $      */

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * William Jolitz.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)asm.h       5.5 (Berkeley) 5/7/91
 */

#ifndef _MACHINE_ASM_H_
#define _MACHINE_ASM_H_

#ifdef __PIC__
#define PIC_PROLOGUE    \
        pushl   %ebx;   \
        call    666f;   \
666:                    \
        popl    %ebx;   \
        addl    $_GLOBAL_OFFSET_TABLE_+[.-666b], %ebx
#define PIC_EPILOGUE    \
        popl    %ebx
#define PIC_PLT(x)      x@PLT
#define PIC_GOT(x)      x@GOT(%ebx)
#define PIC_GOTOFF(x)   x@GOTOFF(%ebx)
#else
#define PIC_PROLOGUE
#define PIC_EPILOGUE
#define PIC_PLT(x)      x
#define PIC_GOT(x)      x
#define PIC_GOTOFF(x)   x
#endif

#define _C_LABEL(name)  name
#define _ASM_LABEL(x)   x

#define CVAROFF(x, y)   x + y

#ifdef __STDC__
# define __CONCAT(x,y)  x ## y
# define __STRING(x)    #x
#else
# define __CONCAT(x,y)  x/**/y
# define __STRING(x)    "x"
#endif

/*
 * STRONG_ALIAS, WEAK_ALIAS
 *      Create a strong or weak alias.
 */
#define STRONG_ALIAS(alias,sym) \
        .global alias; \
        alias = sym
#define WEAK_ALIAS(alias,sym) \
        .weak alias; \
        alias = sym

/* let kernels and others override entrypoint alignment */
#ifndef _ALIGN_TEXT
# define _ALIGN_TEXT .align 2, 0x90
#endif

/* NB == No Binding: use .globl or .weak as necessary */
#define _ENTRY_NB(x) \
        .text; _ALIGN_TEXT; .type x,@function; x:
#define _ENTRY(x)       .globl x; _ENTRY_NB(x)

#ifdef _KERNEL
#define KUTEXT  .section .kutext, "ax"

#define IDTVEC(name)    \
        KUTEXT; ALIGN_TEXT;     \
        .globl X##name; X##name:
#define KIDTVEC(name)    \
        .text; ALIGN_TEXT;      \
        .globl X##name; X##name:
#define KUENTRY(x) \
        KUTEXT; _ALIGN_TEXT; .globl x; .type x,@function; x:

#endif  /* _KERNEL */

#if defined(PROF) || defined(GPROF)
# define _PROF_PROLOGUE \
        pushl %ebp; movl %esp,%ebp; call PIC_PLT(mcount); popl %ebp
#else
# define _PROF_PROLOGUE
#endif

#define ENTRY(y)        _ENTRY(y); _PROF_PROLOGUE
#define ENTRY_NB(y)     _ENTRY_NB(y); _PROF_PROLOGUE
#define NENTRY(y)       _ENTRY(y)
#define ASENTRY(y)      _ENTRY(y); _PROF_PROLOGUE
#define NASENTRY(y)     _ENTRY(y)
#define END(y)          .size y, . - y

#define ALTENTRY(name)  .globl name; name:

#ifdef _KERNEL

#define CPUVAR(var)     %fs:__CONCAT(CPU_INFO_,var)

#endif /* _KERNEL */

#endif /* !_MACHINE_ASM_H_ */