xref: /freebsd-11-stable/sys/arm/include/asm.h

/*	$NetBSD: asm.h,v 1.5 2003/08/07 16:26:53 agc 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.
 *
 *	from: @(#)asm.h	5.5 (Berkeley) 5/7/91
 *
 * $FreeBSD: head/sys/arm/include/asm.h 248361 2013-03-16 02:48:49Z andrew $
 */

#ifndef _MACHINE_ASM_H_
#define _MACHINE_ASM_H_
#include <sys/cdefs.h>

#ifdef __ELF__
# define _C_LABEL(x)	x
#else
# ifdef __STDC__
#  define _C_LABEL(x)	_ ## x
# else
#  define _C_LABEL(x)	_/**/x
# endif
#endif
#define	_ASM_LABEL(x)	x

#ifndef _JB_MAGIC__SETJMP
#define _JB_MAGIC__SETJMP       0x4278f500
#define _JB_MAGIC_SETJMP        0x4278f501
#endif

#define I32_bit (1 << 7)	/* IRQ disable */
#define F32_bit (1 << 6)        /* FIQ disable */

#define CPU_CONTROL_32BP_ENABLE 0x00000010 /* P: 32-bit exception handlers */
#define CPU_CONTROL_32BD_ENABLE 0x00000020 /* D: 32-bit addressing */

#ifndef _ALIGN_TEXT
# define _ALIGN_TEXT .align 0
#endif

#ifdef __ARM_EABI__
#define	STOP_UNWINDING	.cantunwind
#define	_FNSTART	.fnstart
#define	_FNEND		.fnend
#else
#define	STOP_UNWINDING
#define	_FNSTART
#define	_FNEND
#endif

/*
 * gas/arm uses @ as a single comment character and thus cannot be used here
 * Instead it recognised the # instead of an @ symbols in .type directives
 * We define a couple of macros so that assembly code will not be dependant
 * on one or the other.
 */
#define _ASM_TYPE_FUNCTION	#function
#define _ASM_TYPE_OBJECT	#object
#define GLOBAL(X) .globl x
#define _ENTRY(x) \
	.text; _ALIGN_TEXT; .globl x; .type x,_ASM_TYPE_FUNCTION; x: _FNSTART

#define	END(x)	.size x, . - x; _FNEND

#ifdef GPROF
#  define _PROF_PROLOGUE	\
	mov ip, lr; bl __mcount
#else
# define _PROF_PROLOGUE
#endif

#define	ENTRY(y)	_ENTRY(_C_LABEL(y)); _PROF_PROLOGUE
#define	ENTRY_NP(y)	_ENTRY(_C_LABEL(y))
#define	ASENTRY(y)	_ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE
#define	ASENTRY_NP(y)	_ENTRY(_ASM_LABEL(y))

#define	ASMSTR		.asciz

#if defined(__ELF__) && defined(PIC)
#ifdef __STDC__
#define	PIC_SYM(x,y)	x ## ( ## y ## )
#else
#define	PIC_SYM(x,y)	x/**/(/**/y/**/)
#endif
#else
#define	PIC_SYM(x,y)	x
#endif

#undef __FBSDID
#if !defined(lint) && !defined(STRIP_FBSDID)
#define __FBSDID(s)     .ident s
#else
#define __FBSDID(s)     /* nothing */
#endif


#ifdef __ELF__
#define	WEAK_ALIAS(alias,sym)						\
	.weak alias;							\
	alias = sym
#endif

#ifdef __STDC__
#define	WARN_REFERENCES(sym,msg)					\
	.stabs msg ## ,30,0,0,0 ;					\
	.stabs __STRING(_C_LABEL(sym)) ## ,1,0,0,0
#elif defined(__ELF__)
#define	WARN_REFERENCES(sym,msg)					\
	.stabs msg,30,0,0,0 ;						\
	.stabs __STRING(sym),1,0,0,0
#else
#define	WARN_REFERENCES(sym,msg)					\
	.stabs msg,30,0,0,0 ;						\
	.stabs __STRING(_/**/sym),1,0,0,0
#endif /* __STDC__ */

/* Exactly one of the __ARM_ARCH_*__ macros will be defined by the compiler. */
/* The _ARM_ARCH_* macros are deprecated and will be removed soon. */
/* This should be moved into another header so it can be used in
 * both asm and C code. machine/asm.h cannot be included in C code. */
#if defined (__ARM_ARCH_7__) || defined (__ARM_ARCH_7A__)
#define _ARM_ARCH_7
#define _HAVE_ARMv7_INSTRUCTIONS 1
#endif

#if defined (_HAVE_ARMv7_INSTRUCTIONS) || defined (__ARM_ARCH_6__) || \
	defined (__ARM_ARCH_6J__) || defined (__ARM_ARCH_6K__) || \
	defined (__ARM_ARCH_6Z__) || defined (__ARM_ARCH_6ZK__)
#define _ARM_ARCH_6
#define _HAVE_ARMv6_INSTRUCTIONS 1
#endif

#if defined (_HAVE_ARMv6_INSTRUCTIONS) || defined (__ARM_ARCH_5TE__) || \
    defined (__ARM_ARCH_5TEJ__) || defined (__ARM_ARCH_5E__)
#define _ARM_ARCH_5E
#define _HAVE_ARMv5E_INSTRUCTIONS 1
#endif

#if defined (_HAVE_ARMv5E_INSTRUCTIONS) || defined (__ARM_ARCH_5__) || \
    defined (__ARM_ARCH_5T__)
#define _ARM_ARCH_5
#define _HAVE_ARMv5_INSTRUCTIONS 1
#endif

#if defined (_HAVE_ARMv5_INSTRUCTIONS) || defined (__ARM_ARCH_4T__)
#define _ARM_ARCH_4T
#define _HAVE_ARMv4T_INSTRUCTIONS 1
#endif

/* FreeBSD requires ARMv4, so this is always set. */
#define _HAVE_ARMv4_INSTRUCTIONS 1

#if defined (_HAVE_ARMv4T_INSTRUCTIONS)
# define RET	bx	lr
# define RETeq	bxeq	lr
# define RETne	bxne	lr
# define RETc(c) bx##c	lr
#else
# define RET	mov	pc, lr
# define RETeq	moveq	pc, lr
# define RETne	movne	pc, lr
# define RETc(c) mov##c	pc, lr
#endif

#endif /* !_MACHINE_ASM_H_ */