File:
[gforth] /
gforth /
Attic /
386.h
Revision
1.15:
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Tue Mar 4 17:49:45 1997 UTC (27 years, 1 month ago) by
anton
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MAIN
CVS tags:
v0-3-0,
HEAD
added double indirect threaded version and making of fully relocatable images.
added gforth-makeimage script for making fully relocatable images.
removed locals bug in if else endif constructs.
added mmap support for machines without MAP_ANON
removed command-line options -c and -o
moved definition of DOES_HANDLER_SIZE from machine.h to forth.h.
added hpux FLUSH_ICACHE in m68k.h
made source words print decimal
/*
This is the machine-specific part for Intel 386 compatible processors
Copyright (C) 1995 Free Software Foundation, Inc.
This file is part of Gforth.
Gforth is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "32bit.h"
/* indirect threading is faster on the 486, on the 386 direct
threading is probably faster. Therefore we leave defining
DIRECT_THREADED to configure */
/* define this if the processor cannot exploit instruction-level
parallelism (no pipelining or too few registers) */
#define CISC_NEXT
/* 386 and below have no cache, 486 has a shared cache, and the
Pentium probably employs hardware cache consistency, so
flush-icache is a noop */
#define FLUSH_ICACHE(addr,size)
#ifdef DIRECT_THREADED
#define CALL 0xe8 /* call */
#define JMP 0xe9 /* jmp */
#define GETCFA(reg) ({ asm("popl %0" : "=r" (reg)); (int)reg -= 5;});
/* PFA gives the parameter field address corresponding to a cfa */
#define PFA(cfa) (((Cell *)cfa)+2)
/* PFA1 is a special version for use just after a NEXT1 */
#define PFA1(cfa) PFA(cfa)
/* CODE_ADDRESS is the address of the code jumped to through the code field */
#define CODE_ADDRESS(cfa) \
({long _cfa = (long)(cfa); (Label)(_cfa+*((long *)(_cfa+1))+5);})
/* MAKE_CF creates an appropriate code field at the cfa; ca is the code address */
#define MAKE_CF(cfa,ca) ({long _cfa = (long)(cfa); \
long _ca = (long)(ca); \
*(char *)_cfa = CALL; \
*(long *)(_cfa+1) = _ca-(_cfa+5);})
/* this is the point where the does code starts if label points to the
* jump dodoes */
#define DOES_CODE(xt) \
({ long _xt = (long)(xt); \
long _ca = (long)(CODE_ADDRESS(_xt)); \
((((*(unsigned char *)_xt) == CALL) \
&& ((*(unsigned char *)_ca) == JMP) \
&& ((long)(CODE_ADDRESS(_ca)) == (long)&&dodoes)) \
? _ca+DOES_HANDLER_SIZE : 0L); })
/* this is a special version of DOES_CODE for use in dodoes */
#define DOES_CODE1(label) (CODE_ADDRESS(label)+DOES_HANDLER_SIZE)
/* this stores a jump dodoes at addr */
#define MAKE_DOES_CF(addr,doesp) ({long _addr = (long)(addr); \
long _doesp = (long)(doesp)-8; \
*(char *)_addr = CALL; \
*(long *)(_addr+1) = _doesp-(_addr+5);})
#define MAKE_DOES_HANDLER(addr) ({long _addr = (long)(addr); \
long _dodo = (long)symbols[DODOES]; \
*(char *)_addr = JMP; \
*(long *)(_addr+1) = _dodo-(_addr+5);})
#endif
#ifdef FORCE_REG
#if (__GNUC__==2 && defined(__GNUC_MINOR__) && __GNUC_MINOR__==5)
/* i.e. gcc-2.5.x */
/* this works with 2.5.7; nothing works with 2.5.8 */
#define IPREG asm("%esi")
#define SPREG asm("%edi")
#ifdef USE_TOS
#define CFAREG asm("%ecx")
#else
#define CFAREG asm("%edx")
#endif
#else /* gcc-version */
/* this works with 2.6.3 (and quite well, too) */
/* since this is not very demanding, it's the default for other gcc versions */
#if defined(USE_TOS) && !defined(CFA_NEXT)
#define IPREG asm("%ebx")
#else
#define SPREG asm("%ebx")
#endif /* USE_TOS && !CFA_NEXT */
#endif /* gcc-version */
#endif /* FORCE_REG */
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