version 1.9, 1995/10/11 19:39:31
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version 1.13, 1996/07/25 09:25:15
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/* |
/* |
Copyright 1992 by the ANSI figForth Development Group |
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This is the machine-specific part for Intel 386 compatible processors |
This is the machine-specific part for Intel 386 compatible processors |
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Copyright (C) 1995 Free Software Foundation, Inc. |
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This file is part of Gforth. |
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Gforth is free software; you can redistribute it and/or |
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modify it under the terms of the GNU General Public License |
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as published by the Free Software Foundation; either version 2 |
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of the License, or (at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
*/ |
*/ |
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#include "32bit.h" |
#include "32bit.h" |
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/* 386 and below have no cache, 486 has a shared cache, and the |
/* 386 and below have no cache, 486 has a shared cache, and the |
Pentium probably employs hardware cache consistency, so |
Pentium probably employs hardware cache consistency, so |
flush-icache is a noop */ |
flush-icache is a noop */ |
#define FLUSH_ICACHE(addr,size) 0 |
#define FLUSH_ICACHE(addr,size) |
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#ifdef DIRECT_THREADED |
#ifdef DIRECT_THREADED |
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#define CALL 0xe8 /* call */ |
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#define JMP 0xe9 /* jmp */ |
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#define GETCFA(reg) ({ asm("popl %0" : "=r" (reg)); (int)reg -= 5;}); |
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/* PFA gives the parameter field address corresponding to a cfa */ |
/* PFA gives the parameter field address corresponding to a cfa */ |
#define PFA(cfa) (((Cell *)cfa)+2) |
#define PFA(cfa) (((Cell *)cfa)+2) |
/* PFA1 is a special version for use just after a NEXT1 */ |
/* PFA1 is a special version for use just after a NEXT1 */ |
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/* MAKE_CF creates an appropriate code field at the cfa; ca is the code address */ |
/* MAKE_CF creates an appropriate code field at the cfa; ca is the code address */ |
#define MAKE_CF(cfa,ca) ({long _cfa = (long)(cfa); \ |
#define MAKE_CF(cfa,ca) ({long _cfa = (long)(cfa); \ |
long _ca = (long)(ca); \ |
long _ca = (long)(ca); \ |
*(char *)_cfa = 0xe9; /* jmp */ \ |
*(char *)_cfa = CALL; \ |
*(long *)(_cfa+1) = _ca-(_cfa+5);}) |
*(long *)(_cfa+1) = _ca-(_cfa+5);}) |
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/* this is the point where the does code starts if label points to the |
/* this is the point where the does code starts if label points to the |
* jump dodoes */ |
* jump dodoes */ |
#define DOES_HANDLER_SIZE 8 |
#define DOES_HANDLER_SIZE 8 |
#define DOES_CODE(label) ((Xt *)(CODE_ADDRESS(label)+DOES_HANDLER_SIZE)) |
#define DOES_CODE(xt) \ |
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({ long _xt = (long)(xt); \ |
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long _ca = (long)(CODE_ADDRESS(_xt)); \ |
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(((*(unsigned char *)_xt) == CALL) && \ |
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((*(unsigned char *)_ca) == JMP) && \ |
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((long)(CODE_ADDRESS(_ca)) == (long)symbols[DODOES])) ? \ |
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_ca+DOES_HANDLER_SIZE : 0L; }) |
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/* this is a special version of DOES_CODE for use in dodoes */ |
/* this is a special version of DOES_CODE for use in dodoes */ |
#define DOES_CODE1(label) DOES_CODE(label) |
#define DOES_CODE1(label) (CODE_ADDRESS(label)+DOES_HANDLER_SIZE) |
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/* this stores a jump dodoes at addr */ |
/* this stores a jump dodoes at addr */ |
#define MAKE_DOES_HANDLER(addr) MAKE_CF(addr,symbols[DODOES]) |
#define MAKE_DOES_CF(addr,doesp) ({long _addr = (long)(addr); \ |
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long _doesp = (long)(doesp)-8; \ |
#define MAKE_DOES_CF(addr,doesp) MAKE_CF(addr,((int)(doesp)-8)) |
*(char *)_addr = CALL; \ |
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*(long *)(_addr+1) = _doesp-(_addr+5);}) |
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#define MAKE_DOES_HANDLER(addr) ({long _addr = (long)(addr); \ |
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long _dodo = (long)symbols[DODOES]; \ |
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*(char *)_addr = JMP; \ |
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*(long *)(_addr+1) = _dodo-(_addr+5);}) |
#endif |
#endif |
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#ifdef FORCE_REG |
#ifdef FORCE_REG |
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#else /* gcc-version */ |
#else /* gcc-version */ |
/* this works with 2.6.3 (and quite well, too) */ |
/* this works with 2.6.3 (and quite well, too) */ |
/* since this is not very demanding, it's the default for other gcc versions */ |
/* since this is not very demanding, it's the default for other gcc versions */ |
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#if defined(USE_TOS) && !defined(CFA_NEXT) |
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#define IPREG asm("%ebx") |
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#else |
#define SPREG asm("%ebx") |
#define SPREG asm("%ebx") |
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#endif /* USE_TOS && !CFA_NEXT */ |
#endif /* gcc-version */ |
#endif /* gcc-version */ |
#endif /* FORCE_REG */ |
#endif /* FORCE_REG */ |