xref: /src/sys/arch/arm/include/asm.h

/*	$NetBSD: asm.h,v 1.12.12.1 2014/02/15 16:18:36 matt 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
 */

#ifndef _ARM32_ASM_H_
#define _ARM32_ASM_H_

#include <arm/cdefs.h>

	/* .syntax		unified */

#ifdef __thumb__
#define THUMB_INSN(n)	n
#else
#define THUMB_INSN(n)
#endif

#define UPPER16(n)	(((n) >> 16) & 0xffff)
#define LOWER16(n)	((n) & 0xffff)

#define	__BIT(n)	(1 << (n))
#define __BITS(hi,lo)	((~((~0)<<((hi)+1)))&((~0)<<(lo)))

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

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

#ifndef _ALIGN_TEXT
# define _ALIGN_TEXT .align 2
#endif

#ifndef _TEXT_SECTION
#define _TEXT_SECTION	.text
#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 dependent
 * on one or the other.
 */
#define _ASM_TYPE_FUNCTION	%function
#define _ASM_TYPE_OBJECT	%object
#define _THUMB_ENTRY(x) \
	_TEXT_SECTION; _ALIGN_TEXT; .globl x; .type x,_ASM_TYPE_FUNCTION; \
	.thumb_func; .code 16; x:
#define _ARM_ENTRY(x) \
	_TEXT_SECTION; _ALIGN_TEXT; .globl x; .type x,_ASM_TYPE_FUNCTION; \
	.code 32; x:
#ifdef __thumb__
#define	_ENTRY(x)	_THUMB_ENTRY(x)
#else
#define	_ENTRY(x)	_ARM_ENTRY(x)
#endif
#define	_END(x)		.size x,.-x

#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	END(y)			_END(_C_LABEL(y))
#define	ARM_ENTRY(y)		_ARM_ENTRY(_C_LABEL(y)); _PROF_PROLOGUE
#define	ARM_ENTRY_NP(y)		_ARM_ENTRY(_C_LABEL(y))
#define	THUMB_ENTRY(y)		_THUMB_ENTRY(_C_LABEL(y)); _PROF_PROLOGUE
#define	THUMB_ENTRY_NP(y)	_THUMB_ENTRY(_C_LABEL(y))
#define	END(y)			_END(_C_LABEL(y))
#define	ASENTRY(y)		_ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE
#define	ASENTRY_NP(y)		_ENTRY(_ASM_LABEL(y))
#define	ASEND(y)		_END(_ASM_LABEL(y))
#define	ARM_ASENTRY(y)		_ARM_ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE
#define	ARM_ASENTRY_NP(y)	_ARM_ENTRY(_ASM_LABEL(y))
#define	THUMB_ASENTRY(y)	_THUMB_ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE
#define	THUMB_ASENTRY_NP(y)	_THUMB_ENTRY(_ASM_LABEL(y))

#define	ASMSTR		.asciz

#ifdef __PIC__
#define	REL_SYM(a, b)	((a) - (b))
#define	PLT_SYM(x)	x
#define	GOT_SYM(x)	PIC_SYM(x, GOT)
#define	GOT_GET(x,got,sym)	\
	ldr	x, sym;		\
	ldr	x, [x, got]
#define	GOT_INIT(got,gotsym,pclabel) \
	ldr	got, gotsym;	\
	pclabel: add	got, got, pc
#ifdef __thumb__
#define	GOT_INITSYM(gotsym,pclabel) \
	.align 0;		\
	gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+4)
#else
#define	GOT_INITSYM(gotsym,pclabel) \
	.align 0;		\
	gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+8)
#endif

#ifdef __STDC__
#define	PIC_SYM(x,y)	x ## ( ## y ## )
#else
#define	PIC_SYM(x,y)	x/**/(/**/y/**/)
#endif

#else
#define	REL_SYM(a, b)	(a)
#define	PLT_SYM(x)	x
#define	GOT_SYM(x)	x
#define	GOT_GET(x,got,sym)	\
	ldr	x, sym;
#define	GOT_INIT(got,gotsym,pclabel)
#define	GOT_INITSYM(gotsym,pclabel)
#define	PIC_SYM(x,y)	x
#endif	/* __PIC__ */

#define RCSID(x)	.pushsection ".ident"; .asciz x; .popsection

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

/*
 * STRONG_ALIAS: create a strong alias.
 */
#define STRONG_ALIAS(alias,sym)						\
	.globl alias;							\
	alias = sym

#ifdef __STDC__
#define	WARN_REFERENCES(sym,msg)					\
	.pushsection .gnu.warning. ## sym;				\
	.ascii msg;							\
	.popsection
#else
#define	WARN_REFERENCES(sym,msg)					\
	.pushsection .gnu.warning./**/sym;				\
	.ascii msg;							\
	.popsection
#endif /* __STDC__ */

#ifdef __thumb__
# define XPUSH		push
# define XPOP		pop
# define XPOPRET	pop	{pc}
#else
# define XPUSH		stmfd	sp!,
# define XPOP		ldmfd	sp!,
# ifdef _ARM_ARCH_5
#  define XPOPRET	ldmfd	sp!, {pc}
# else
#  define XPOPRET	ldmfd	sp!, {lr}; mov pc, lr
# endif
#endif

#if defined (_ARM_ARCH_4T)
# define RET		bx		lr
# define RETr(r)	bx		r
# if defined(__thumb__)
#  if defined(_ARM_ARCH_7)
#   define RETc(c)	it c; __CONCAT(bx,c)	lr
#  endif
# else
#  define RETc(c)	__CONCAT(bx,c)	lr
# endif
#else
# define RET		mov		pc, lr
# define RETr(r)	mov		pc, r
# define RETc(c)	__CONCAT(mov,c)	pc, lr
#endif

#ifdef _ARM_ARCH_7
#define KMODTRAMPOLINE(n)			\
_ENTRY(__wrap_ ## n)				\
	movw	ip, #:lower16:n;	\
	movt	ip, #:upper16:n;	\
	bx	ip
#elif defined(_ARM_ARCH_4T)
#define KMODTRAMPOLINE(n)	\
_ENTRY(__wrap_ ## n)		\
	ldr	ip, [pc];	\
	bx	ip;		\
	.word	n
#else
#define KMODTRAMPOLINE(n)	\
_ENTRY(__wrap_ ## n)		\
	ldr	pc, [pc, #-4];	\
	.word	n
#endif

.macro	lsls	a,b,c
	movs	\a, \b, lsl \c
.endm
.macro	lsl	a,b,c
	mov	\a, \b, lsl \c
.endm
.macro	lsrs	a,b,c
	movs	\a, \b, lsr \c
.endm
.macro	lsr	a,b,c
	mov	\a, \b, lsr \c
.endm
.macro	negs	a,b
	rsbs	\a, \b, #0
.endm
.macro	neg	a,b
	rsb	\a, \b, #0
.endm
.macro	ldrd	a,b,c,d
	ldrald	\a, \c, \d
.endm
.macro	strd	a,b,c,d
	strald	\a, \c, \d
.endm
#define	strbge	strgeb
#define	strbgt	strgtb
#define	ldrbge	ldrgeb
#define	ldrbgt	ldrgtb
#define ldmdbeq	ldmeqdb
#define ldrtne	ldrnet
#define ldrtge	ldrget
#define ldrtgt	ldrgtt
#define ldrbtge	ldrgebt
#define ldrbtgt	ldrgtbt
#define strtge	strget
#define strtne	strnet
#define strbtge	strgebt
#define strbtgt	strgtbt

#endif /* !_ARM_ASM_H_ */