| /* |
/* |
| Copyright 1992 by the ANSI figForth Development Group |
|
| |
|
| 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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|
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Copyright (C) 1995 Free Software Foundation, Inc. |
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|
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This file is part of Gforth. |
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|
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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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|
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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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|
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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. |
| */ |
*/ |
| |
|
| #include "32bit.h" |
#include "32bit.h" |
| /* 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) |
| |
|
| #ifdef DIRECT_THREADED |
#ifdef DIRECT_THREADED |
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|
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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 */ |
| /* 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);}) |
| |
|
| /* 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 |
| #define DOES_CODE1(label) DOES_CODE(label) |
#define DOES_CODE1(label) DOES_CODE(label) |
| |
|
| /* 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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|
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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 |
| |
|
| #ifdef FORCE_REG |
#ifdef FORCE_REG |
| #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 */ |
