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freebsd-nq/sys/arm/include/asm.h
Ian Lepore 301e1601ad Fix alignment directives in arm asm code after clang 3.5 import. 
The ancient gas we've been using interprets .align 0 as align to the
minimum required alignment for the current section.  Clang's integrated
assembler interprets it as align to a byte boundary.  Fortunately both
assemblers interpret a non-zero value as align to 2^N so just make sure
we have appropriate non-zero values everywhere.
2015-01-02 23:46:26 +00:00

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/* $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
*
* $FreeBSD$
*/
#ifndef _MACHINE_ASM_H_
#define _MACHINE_ASM_H_
#include <sys/cdefs.h>
#include <machine/acle-compat.h>
#include <machine/sysreg.h>
#define _C_LABEL(x) x
#define _ASM_LABEL(x) x
#ifndef _ALIGN_TEXT
# define _ALIGN_TEXT .align 2
#endif
#if defined(__ARM_EABI__) && !defined(_STANDALONE)
#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.
* It recognises the # instead of an @ symbol in .type directives.
*/
#define _ASM_TYPE_FUNCTION #function
#define _ASM_TYPE_OBJECT #object
/* XXX Is this still the right prologue for profiling? */
#ifdef GPROF
#define _PROF_PROLOGUE \
mov ip, lr; \
bl __mcount
#else
#define _PROF_PROLOGUE
#endif
/*
* EENTRY()/EEND() mark "extra" entry/exit points from a function.
* LEENTRY()/LEEND() are the the same for local symbols.
* The unwind info cannot handle the concept of a nested function, or a function
* with multiple .fnstart directives, but some of our assembler code is written
* with multiple labels to allow entry at several points. The EENTRY() macro
* defines such an extra entry point without a new .fnstart, so that it's
* basically just a label that you can jump to. The EEND() macro does nothing
* at all, except document the exit point associated with the same-named entry.
*/
#define GLOBAL(x) .global x
#define _LEENTRY(x) .type x,_ASM_TYPE_FUNCTION; x:
#define _LEEND(x) /* nothing */
#define _EENTRY(x) GLOBAL(x); _LEENTRY(x)
#define _EEND(x) _LEEND(x)
#define _LENTRY(x) .text; _ALIGN_TEXT; _LEENTRY(x); _FNSTART
#define _LEND(x) .size x, . - x; _FNEND
#define _ENTRY(x) .text; _ALIGN_TEXT; _EENTRY(x); _FNSTART
#define _END(x) _LEND(x)
#define ENTRY(y) _ENTRY(_C_LABEL(y)); _PROF_PROLOGUE
#define EENTRY(y) _EENTRY(_C_LABEL(y));
#define ENTRY_NP(y) _ENTRY(_C_LABEL(y))
#define EENTRY_NP(y) _EENTRY(_C_LABEL(y))
#define END(y) _END(_C_LABEL(y))
#define EEND(y) _EEND(_C_LABEL(y))
#define ASENTRY(y) _ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE
#define ASLENTRY(y) _LENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE
#define ASEENTRY(y) _EENTRY(_ASM_LABEL(y));
#define ASLEENTRY(y) _LEENTRY(_ASM_LABEL(y));
#define ASENTRY_NP(y) _ENTRY(_ASM_LABEL(y))
#define ASLENTRY_NP(y) _LENTRY(_ASM_LABEL(y))
#define ASEENTRY_NP(y) _EENTRY(_ASM_LABEL(y))
#define ASLEENTRY_NP(y) _LEENTRY(_ASM_LABEL(y))
#define ASEND(y) _END(_ASM_LABEL(y))
#define ASLEND(y) _LEND(_ASM_LABEL(y))
#define ASEEND(y) _EEND(_ASM_LABEL(y))
#define ASLEEND(y) _LEEND(_ASM_LABEL(y))
#define ASMSTR .asciz
#if defined(PIC)
#define PLT_SYM(x) PIC_SYM(x, PLT)
#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 2; \
gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+4)
#else
#define GOT_INITSYM(gotsym,pclabel) \
.align 2; \
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 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 */
#undef __FBSDID
#if !defined(lint) && !defined(STRIP_FBSDID)
#define __FBSDID(s) .ident s
#else
#define __FBSDID(s) /* nothing */
#endif
#define WEAK_ALIAS(alias,sym) \
.weak alias; \
alias = sym
#ifdef __STDC__
#define WARN_REFERENCES(sym,msg) \
.stabs msg ## ,30,0,0,0 ; \
.stabs __STRING(_C_LABEL(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
#if __ARM_ARCH >= 7
#define ISB isb
#define DSB dsb
#define DMB dmb
#define WFI wfi
#elif __ARM_ARCH == 6
#define ISB mcr CP15_CP15ISB
#define DSB mcr CP15_CP15DSB
#define DMB mcr CP15_CP15DMB
#define WFI mcr CP15_CP15WFI
#else
#define ISB mcr CP15_CP15ISB
#define DSB mcr CP15_CP15DSB /* DSB and DMB are the */
#define DMB mcr CP15_CP15DSB /* same prior to v6.*/
/* No form of WFI available on v4, define nothing to get an error on use. */
#endif
#endif /* !_MACHINE_ASM_H_ */
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