freebsd-dev/sys/i386/include/asm.h

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/*-
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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: @(#)DEFS.h 5.1 (Berkeley) 4/23/90
* $Id: asm.h,v 1.1 1997/03/09 10:39:15 bde Exp $
*/
#include <sys/cdefs.h>
#ifdef PIC
#define PIC_PROLOGUE \
pushl %ebx; \
call 1f; \
1: \
popl %ebx; \
addl $_GLOBAL_OFFSET_TABLE_+[.-1b],%ebx
#define PIC_EPILOGUE \
popl %ebx
#define PIC_PLT(x) x@PLT
#define PIC_GOT(x) x@GOT(%ebx)
#define PIC_GOTOFF(x) x@GOTOFF(%ebx)
#else
#define PIC_PROLOGUE
#define PIC_EPILOGUE
#define PIC_PLT(x) x
#define PIC_GOT(x) x
#define PIC_GOTOFF(x) x
#endif
/*
* CNAME and HIDENAME manage the relationship between symbol names in C
* and the equivalent assembly language names. CNAME is given a name as
* it would be used in a C program. It expands to the equivalent assembly
* language name. HIDENAME is given an assembly-language name, and expands
* to a possibly-modified form that will be invisible to C programs.
*/
#if defined(__ELF__) /* { */
#define CNAME(csym) csym
#define HIDENAME(asmsym) __CONCAT(.,asmsym)
#else /* } { */
#define CNAME(csym) __CONCAT(_,csym)
#define HIDENAME(asmsym) asmsym
#endif /* } */
/* XXX should use align 4,0x90 for -m486. */
#define _START_ENTRY .text; .align 2,0x90;
#if 0
/* Data is not used, except perhaps by non-g prof, which we don't support. */
#define _MID_ENTRY .data; .align 2; 8:; .long 0; \
.text; lea 8b,%eax;
#else
#define _MID_ENTRY
#endif
#ifdef PROF
#define ALTENTRY(x) _START_ENTRY \
.globl CNAME(x); .type CNAME(x),@function; CNAME(x):; \
_MID_ENTRY \
call HIDENAME(mcount); jmp 9f
#define ENTRY(x) _START_ENTRY \
.globl CNAME(x); .type CNAME(x),@function; CNAME(x):; \
_MID_ENTRY \
call HIDENAME(mcount); 9:
#define ALTASENTRY(x) _START_ENTRY \
.globl x; .type x,@function; x:; \
_MID_ENTRY \
call HIDENAME(mcount); jmp 9f
#define ASENTRY(x) _START_ENTRY \
.globl x; .type x,@function; x:; \
_MID_ENTRY \
call HIDENAME(mcount); 9:
#else /* !PROF */
#define ENTRY(x) _START_ENTRY .globl CNAME(x); .type CNAME(x),@function; \
CNAME(x):
#define ALTENTRY(x) ENTRY(x)
#define ASENTRY(x) _START_ENTRY .globl x; .type x,@function; x:
#define ALTASENTRY(x) ASENTRY(x)
#endif
/*
* This header is currently only used in lib/msun/i387.
* Use it to generate code to select between the generic math functions
* and the i387 ones.
*/
#undef ENTRY
#define ANAME(x) CNAME(__CONCAT(__i387_,x))
#define ASELNAME(x) CNAME(__CONCAT(__arch_select_,x))
#define AVECNAME(x) CNAME(__CONCAT(__arch_,x))
#define GNAME(x) CNAME(__CONCAT(__generic_,x))
/* Don't bother profiling this. */
#ifdef PIC
#define ARCH_DISPATCH(x) \
_START_ENTRY; \
.globl CNAME(x); .type CNAME(x),@function; CNAME(x): ; \
PIC_PROLOGUE; \
movl PIC_GOT(AVECNAME(x)),%eax; \
PIC_EPILOGUE; \
jmpl *(%eax)
#define ARCH_SELECT(x) _START_ENTRY; \
.type ASELNAME(x),@function; \
ASELNAME(x): \
PIC_PROLOGUE; \
call PIC_PLT(CNAME(__get_hw_float)); \
testl %eax,%eax; \
movl PIC_GOT(ANAME(x)),%eax; \
jne 8f; \
movl PIC_GOT(GNAME(x)),%eax; \
8: \
movl PIC_GOT(AVECNAME(x)),%edx; \
movl %eax,(%edx); \
PIC_EPILOGUE; \
jmpl *%eax
#else /* !PIC */
#define ARCH_DISPATCH(x) \
_START_ENTRY; \
.globl CNAME(x); .type CNAME(x),@function; CNAME(x): ; \
jmpl *AVECNAME(x)
#define ARCH_SELECT(x) _START_ENTRY; \
.type ASELNAME(x),@function; \
ASELNAME(x): \
call CNAME(__get_hw_float); \
testl %eax,%eax; \
movl $ANAME(x),%eax; \
jne 8f; \
movl $GNAME(x),%eax; \
8: \
movl %eax,AVECNAME(x); \
jmpl *%eax
#endif /* PIC */
#define ARCH_VECTOR(x) .data; .align 2; \
.globl AVECNAME(x); \
.type AVECNAME(x),@object; \
.size AVECNAME(x),4; \
AVECNAME(x): .long ASELNAME(x)
#ifdef PROF
#define ALTENTRY(x) ENTRY(x); jmp 9f
#define ENTRY(x) ARCH_VECTOR(x); ARCH_SELECT(x); ARCH_DISPATCH(x); \
_START_ENTRY; \
.globl ANAME(x); .type ANAME(x),@function; ANAME(x):; \
call HIDENAME(mcount); 9:
#else /* !PROF */
#define ALTENTRY(x) ENTRY(x)
#define ENTRY(x) ARCH_VECTOR(x); ARCH_SELECT(x); ARCH_DISPATCH(x); \
_START_ENTRY; \
.globl ANAME(x); .type ANAME(x),@function; ANAME(x):
#endif /* PROF */
#ifndef RCSID
#define RCSID(a)
#endif