202 lines
6.0 KiB
C
202 lines
6.0 KiB
C
/* $NetBSD: asm.h,v 1.5 2003/08/07 16:26:53 agc Exp $ */
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/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)asm.h 5.5 (Berkeley) 5/7/91
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*/
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#ifndef _MACHINE_ASM_H_
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#define _MACHINE_ASM_H_
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#include <sys/cdefs.h>
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#define _C_LABEL(x) x
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#define _ASM_LABEL(x) x
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#ifndef _ALIGN_TEXT
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# define _ALIGN_TEXT .align 2
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#endif
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#ifndef _STANDALONE
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#define STOP_UNWINDING .cantunwind
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#define _FNSTART .fnstart
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#define _FNEND .fnend
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#define _SAVE(...) .save __VA_ARGS__
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#else
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#define STOP_UNWINDING
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#define _FNSTART
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#define _FNEND
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#define _SAVE(...)
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#endif
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/*
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* gas/arm uses @ as a single comment character and thus cannot be used here.
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* It recognises the # instead of an @ symbol in .type directives.
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*/
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#define _ASM_TYPE_FUNCTION #function
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#define _ASM_TYPE_OBJECT #object
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/*
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* EENTRY()/EEND() mark "extra" entry/exit points from a function.
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* LEENTRY()/LEEND() are the same for local symbols.
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* The unwind info cannot handle the concept of a nested function, or a function
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* with multiple .fnstart directives, but some of our assembler code is written
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* with multiple labels to allow entry at several points. The EENTRY() macro
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* defines such an extra entry point without a new .fnstart, so that it's
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* basically just a label that you can jump to. The EEND() macro does nothing
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* at all, except document the exit point associated with the same-named entry.
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*/
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#define GLOBAL(x) .global x
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#ifdef __thumb__
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#define _FUNC_MODE .code 16; .thumb_func
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#else
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#define _FUNC_MODE .code 32
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#endif
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#define _LEENTRY(x) .type x,_ASM_TYPE_FUNCTION; _FUNC_MODE; x:
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#define _LEEND(x) /* nothing */
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#define _EENTRY(x) GLOBAL(x); _LEENTRY(x)
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#define _EEND(x) _LEEND(x)
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#define _LENTRY(x) .text; _ALIGN_TEXT; _LEENTRY(x); _FNSTART
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#define _LEND(x) .size x, . - x; _FNEND
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#define _ENTRY(x) .text; _ALIGN_TEXT; _EENTRY(x); _FNSTART
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#define _END(x) _LEND(x)
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#define ENTRY(y) _ENTRY(_C_LABEL(y));
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#define EENTRY(y) _EENTRY(_C_LABEL(y));
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#define ENTRY_NP(y) _ENTRY(_C_LABEL(y))
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#define EENTRY_NP(y) _EENTRY(_C_LABEL(y))
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#define END(y) _END(_C_LABEL(y))
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#define EEND(y) _EEND(_C_LABEL(y))
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#define ASENTRY(y) _ENTRY(_ASM_LABEL(y));
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#define ASLENTRY(y) _LENTRY(_ASM_LABEL(y));
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#define ASEENTRY(y) _EENTRY(_ASM_LABEL(y));
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#define ASLEENTRY(y) _LEENTRY(_ASM_LABEL(y));
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#define ASENTRY_NP(y) _ENTRY(_ASM_LABEL(y))
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#define ASLENTRY_NP(y) _LENTRY(_ASM_LABEL(y))
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#define ASEENTRY_NP(y) _EENTRY(_ASM_LABEL(y))
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#define ASLEENTRY_NP(y) _LEENTRY(_ASM_LABEL(y))
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#define ASEND(y) _END(_ASM_LABEL(y))
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#define ASLEND(y) _LEND(_ASM_LABEL(y))
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#define ASEEND(y) _EEND(_ASM_LABEL(y))
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#define ASLEEND(y) _LEEND(_ASM_LABEL(y))
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#define ASMSTR .asciz
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#if defined(PIC)
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#define PLT_SYM(x) PIC_SYM(x, PLT)
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#define GOT_SYM(x) PIC_SYM(x, GOT)
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#define GOT_GET(x,got,sym) \
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ldr x, sym; \
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ldr x, [x, got]
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#define GOT_INIT(got,gotsym,pclabel) \
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ldr got, gotsym; \
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pclabel: add got, pc
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#ifdef __thumb__
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#define GOT_INITSYM(gotsym,pclabel) \
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.align 2; \
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gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+4)
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#else
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#define GOT_INITSYM(gotsym,pclabel) \
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.align 2; \
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gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+8)
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#endif
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#ifdef __STDC__
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#define PIC_SYM(x,y) x ## ( ## y ## )
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#else
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#define PIC_SYM(x,y) x/**/(/**/y/**/)
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#endif
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#else
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#define PLT_SYM(x) x
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#define GOT_SYM(x) x
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#define GOT_GET(x,got,sym) \
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ldr x, sym;
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#define GOT_INIT(got,gotsym,pclabel)
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#define GOT_INITSYM(gotsym,pclabel)
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#define PIC_SYM(x,y) x
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#endif /* PIC */
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#undef __FBSDID
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#if !defined(lint) && !defined(STRIP_FBSDID)
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#define __FBSDID(s) .ident s
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#else
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#define __FBSDID(s) /* nothing */
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#endif
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#define WEAK_ALIAS(alias,sym) \
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.weak alias; \
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alias = sym
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#ifdef __STDC__
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#define WARN_REFERENCES(sym,msg) \
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.stabs msg ## ,30,0,0,0 ; \
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.stabs __STRING(_C_LABEL(sym)) ## ,1,0,0,0
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#else
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#define WARN_REFERENCES(sym,msg) \
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.stabs msg,30,0,0,0 ; \
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.stabs __STRING(sym),1,0,0,0
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#endif /* __STDC__ */
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# define RET bx lr
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# define RETeq bxeq lr
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# define RETne bxne lr
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# define RETc(c) bx##c lr
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#if __ARM_ARCH >= 7
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#define ISB isb
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#define DSB dsb
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#define DMB dmb
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#define WFI wfi
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#if defined(__ARM_ARCH_7VE__) || defined(__clang__)
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#define MSR_ELR_HYP(regnum) msr elr_hyp, lr
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#define ERET eret
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#else
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#define MSR_ELR_HYP(regnum) .word (0xe12ef300 | regnum)
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#define ERET .word 0xe160006e
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#endif
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#elif __ARM_ARCH == 6
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#include <machine/sysreg.h>
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#define ISB mcr CP15_CP15ISB
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#define DSB mcr CP15_CP15DSB
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#define DMB mcr CP15_CP15DMB
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#define WFI mcr CP15_CP15WFI
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#endif
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#endif /* !_MACHINE_ASM_H_ */
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