234 lines
5.8 KiB
C
234 lines
5.8 KiB
C
/* $NetBSD: asm.h,v 1.25 2006/01/20 22:02:40 christos Exp $ */
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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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* @(#)asm.h 5.5 (Berkeley) 5/7/91
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*/
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#ifndef _SH3_ASM_H_
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#define _SH3_ASM_H_
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/*
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* The old NetBSD/sh3 ELF toolchain used underscores. The new
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* NetBSD/sh3 ELF toolchain does not. The C pre-processor
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* defines __NO_LEADING_UNDERSCORES__ for the new ELF toolchain.
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*/
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#if defined(__ELF__) && defined(__NO_LEADING_UNDERSCORES__)
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# define _C_LABEL(x) x
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#else
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#ifdef __STDC__
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# define _C_LABEL(x) _ ## x
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#else
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# define _C_LABEL(x) _/**/x
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#endif
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#endif
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#define _ASM_LABEL(x) x
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/* let kernels and others override entrypoint alignment */
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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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#ifdef __ELF__
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#define _ENTRY(x) \
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.text ;\
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_ALIGN_TEXT ;\
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.globl x ;\
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.type x,@function ;\
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x:
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#else /* !__ELF__ */
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#define _ENTRY(x) \
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.text ;\
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_ALIGN_TEXT ;\
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.globl x ;\
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x:
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#endif /* !__ELF__ */
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#ifdef GPROF
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#define _PROF_PROLOGUE \
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mov.l 1f,r1 ; \
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mova 2f,r0 ; \
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jmp @r1 ; \
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nop ; \
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.align 2 ; \
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1: .long __mcount ; \
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2:
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#else /* !GPROF */
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#define _PROF_PROLOGUE
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#endif /* !GPROF */
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#define ENTRY(y) _ENTRY(_C_LABEL(y)) _PROF_PROLOGUE
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#define NENTRY(y) _ENTRY(_C_LABEL(y))
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#define ASENTRY(y) _ENTRY(_ASM_LABEL(y)) _PROF_PROLOGUE
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#define SET_ENTRY_SIZE(y) \
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.size _C_LABEL(y), . - _C_LABEL(y)
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#define SET_ASENTRY_SIZE(y) \
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.size _ASM_LABEL(y), . - _ASM_LABEL(y)
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#ifdef __ELF__
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#define ALTENTRY(name) \
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.globl _C_LABEL(name) ;\
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.type _C_LABEL(name),@function ;\
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_C_LABEL(name):
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#else
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#define ALTENTRY(name) \
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.globl _C_LABEL(name) ;\
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_C_LABEL(name):
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#endif
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/*
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* Hide the gory details of PIC calls vs. normal calls. Use as in the
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* following example:
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*
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* sts.l pr, @-sp
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* PIC_PROLOGUE(.L_got, r0) ! saves old r12 on stack
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* ...
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* mov.l .L_function_1, r0
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* 1: CALL r0 ! each call site needs a label
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* nop
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* ...
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* mov.l .L_function_2, r0
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* 2: CALL r0
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* nop
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* ...
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* PIC_EPILOGUE ! restores r12 from stack
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* lds.l @sp+, pr ! so call in right order
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* rts
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* nop
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*
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* .align 2
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* .L_got:
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* PIC_GOT_DATUM
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* .L_function_1: ! if you call the same function twice
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* CALL_DATUM(function, 1b) ! provide call datum for each call
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* .L_function_2:
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* CALL_DATUM(function, 2b)
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*/
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#ifdef PIC
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#define PIC_PLT(x) x@PLT
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#define PIC_GOT(x) x@GOT
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#define PIC_GOTOFF(x) x@GOTOFF
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#define PIC_PROLOGUE(got) \
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mov.l r12, @-sp; \
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PIC_PROLOGUE_NOSAVE(got)
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/*
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* Functions that do non local jumps don't need to preserve r12,
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* so we can shave off two instructions to save/restore it.
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*/
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#define PIC_PROLOGUE_NOSAVE(got) \
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mov.l got, r12; \
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mova got, r0; \
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add r0, r12
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#define PIC_EPILOGUE \
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mov.l @sp+, r12
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#define PIC_EPILOGUE_SLOT \
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PIC_EPILOGUE
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#define PIC_GOT_DATUM \
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.long _GLOBAL_OFFSET_TABLE_
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#define CALL bsrf
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#define JUMP braf
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#define CALL_DATUM(function, lpcs) \
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.long PIC_PLT(function) - ((lpcs) + 4 - (.))
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/*
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* This will result in text relocations in the shared library,
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* unless the function is local or has hidden or protected visibility.
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* Does not require PIC prologue.
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*/
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#define CALL_DATUM_LOCAL(function, lpcs) \
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.long function - ((lpcs) + 4)
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#else /* !PIC */
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#define PIC_PROLOGUE(label)
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#define PIC_PROLOGUE_NOSAVE(label)
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#define PIC_EPILOGUE
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#define PIC_EPILOGUE_SLOT nop
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#define PIC_GOT_DATUM
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#define CALL jsr @
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#define JUMP jmp @
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#define CALL_DATUM(function, lpcs) \
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.long function
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#define CALL_DATUM_LOCAL(function, lpcs) \
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.long function
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#endif /* !PIC */
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#define ASMSTR .asciz
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#ifdef __ELF__
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#define RCSID(x) .section .ident; .asciz x; .previous
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#else
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#define RCSID(x) .text; .asciz x
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#endif
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#ifdef NO_KERNEL_RCSIDS
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#define __KERNEL_RCSID(_n, _s) /* nothing */
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#else
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#define __KERNEL_RCSID(_n, _s) RCSID(_s)
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#endif
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#ifdef __ELF__
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#define WEAK_ALIAS(alias,sym) \
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.weak _C_LABEL(alias); \
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_C_LABEL(alias) = _C_LABEL(sym)
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#endif
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/*
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* STRONG_ALIAS: create a strong alias.
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*/
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#define STRONG_ALIAS(alias,sym) \
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.globl _C_LABEL(alias); \
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_C_LABEL(alias) = _C_LABEL(sym)
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#define WARN_REFERENCES(_sym,_msg) \
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.section .gnu.warning._sym; .ascii _msg; .previous
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#endif /* !_SH3_ASM_H_ */
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