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| 1 : | anton | 1.1 | /* |
| 2 : | anton | 1.11 | This is the machine-specific part for Intel 386 compatible processors |
| 3 : | |||
| 4 : | Copyright (C) 1995 Free Software Foundation, Inc. | ||
| 5 : | |||
| 6 : | This file is part of Gforth. | ||
| 7 : | anton | 1.1 | |
| 8 : | anton | 1.11 | Gforth is free software; you can redistribute it and/or |
| 9 : | modify it under the terms of the GNU General Public License | ||
| 10 : | as published by the Free Software Foundation; either version 2 | ||
| 11 : | of the License, or (at your option) any later version. | ||
| 12 : | |||
| 13 : | This program is distributed in the hope that it will be useful, | ||
| 14 : | but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 15 : | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| 16 : | GNU General Public License for more details. | ||
| 17 : | |||
| 18 : | You should have received a copy of the GNU General Public License | ||
| 19 : | along with this program; if not, write to the Free Software | ||
| 20 : | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | ||
| 21 : | anton | 1.1 | */ |
| 22 : | |||
| 23 : | anton | 1.7 | #include "32bit.h" |
| 24 : | anton | 1.1 | |
| 25 : | anton | 1.7 | /* indirect threading is faster on the 486, on the 386 direct |
| 26 : | threading is probably faster. Therefore we leave defining | ||
| 27 : | DIRECT_THREADED to configure */ | ||
| 28 : | anton | 1.1 | |
| 29 : | anton | 1.3 | /* define this if the processor cannot exploit instruction-level |
| 30 : | anton | 1.4 | parallelism (no pipelining or too few registers) */ |
| 31 : | anton | 1.3 | #define CISC_NEXT |
| 32 : | |||
| 33 : | anton | 1.9 | /* 386 and below have no cache, 486 has a shared cache, and the |
| 34 : | Pentium probably employs hardware cache consistency, so | ||
| 35 : | flush-icache is a noop */ | ||
| 36 : | pazsan | 1.10 | #define FLUSH_ICACHE(addr,size) |
| 37 : | anton | 1.9 | |
| 38 : | anton | 1.1 | #ifdef DIRECT_THREADED |
| 39 : | pazsan | 1.10 | |
| 40 : | #define CALL 0xe8 /* call */ | ||
| 41 : | #define JMP 0xe9 /* jmp */ | ||
| 42 : | #define GETCFA(reg) ({ asm("popl %0" : "=r" (reg)); (int)reg -= 5;}); | ||
| 43 : | |||
| 44 : | anton | 1.1 | /* PFA gives the parameter field address corresponding to a cfa */ |
| 45 : | #define PFA(cfa) (((Cell *)cfa)+2) | ||
| 46 : | /* PFA1 is a special version for use just after a NEXT1 */ | ||
| 47 : | #define PFA1(cfa) PFA(cfa) | ||
| 48 : | /* CODE_ADDRESS is the address of the code jumped to through the code field */ | ||
| 49 : | pazsan | 1.2 | #define CODE_ADDRESS(cfa) \ |
| 50 : | anton | 1.5 | ({long _cfa = (long)(cfa); (Label)(_cfa+*((long *)(_cfa+1))+5);}) |
| 51 : | anton | 1.1 | /* MAKE_CF creates an appropriate code field at the cfa; ca is the code address */ |
| 52 : | pazsan | 1.2 | #define MAKE_CF(cfa,ca) ({long _cfa = (long)(cfa); \ |
| 53 : | long _ca = (long)(ca); \ | ||
| 54 : | pazsan | 1.10 | *(char *)_cfa = CALL; \ |
| 55 : | pazsan | 1.2 | *(long *)(_cfa+1) = _ca-(_cfa+5);}) |
| 56 : | anton | 1.1 | |
| 57 : | /* this is the point where the does code starts if label points to the | ||
| 58 : | * jump dodoes */ | ||
| 59 : | pazsan | 1.12 | #define DOES_CODE(xt) \ |
| 60 : | anton | 1.13 | ({ long _xt = (long)(xt); \ |
| 61 : | long _ca = (long)(CODE_ADDRESS(_xt)); \ | ||
| 62 : | anton | 1.14 | ((((*(unsigned char *)_xt) == CALL) \ |
| 63 : | && ((*(unsigned char *)_ca) == JMP) \ | ||
| 64 : | && ((long)(CODE_ADDRESS(_ca)) == (long)&&dodoes)) \ | ||
| 65 : | ? _ca+DOES_HANDLER_SIZE : 0L); }) | ||
| 66 : | anton | 1.1 | |
| 67 : | /* this is a special version of DOES_CODE for use in dodoes */ | ||
| 68 : | pazsan | 1.12 | #define DOES_CODE1(label) (CODE_ADDRESS(label)+DOES_HANDLER_SIZE) |
| 69 : | anton | 1.1 | |
| 70 : | /* this stores a jump dodoes at addr */ | ||
| 71 : | pazsan | 1.10 | #define MAKE_DOES_CF(addr,doesp) ({long _addr = (long)(addr); \ |
| 72 : | long _doesp = (long)(doesp)-8; \ | ||
| 73 : | *(char *)_addr = CALL; \ | ||
| 74 : | *(long *)(_addr+1) = _doesp-(_addr+5);}) | ||
| 75 : | |||
| 76 : | #define MAKE_DOES_HANDLER(addr) ({long _addr = (long)(addr); \ | ||
| 77 : | long _dodo = (long)symbols[DODOES]; \ | ||
| 78 : | *(char *)_addr = JMP; \ | ||
| 79 : | *(long *)(_addr+1) = _dodo-(_addr+5);}) | ||
| 80 : | anton | 1.1 | #endif |
| 81 : | anton | 1.4 | |
| 82 : | #ifdef FORCE_REG | ||
| 83 : | anton | 1.8 | #if (__GNUC__==2 && defined(__GNUC_MINOR__) && __GNUC_MINOR__==5) |
| 84 : | /* i.e. gcc-2.5.x */ | ||
| 85 : | /* this works with 2.5.7; nothing works with 2.5.8 */ | ||
| 86 : | anton | 1.4 | #define IPREG asm("%esi") |
| 87 : | #define SPREG asm("%edi") | ||
| 88 : | #ifdef USE_TOS | ||
| 89 : | #define CFAREG asm("%ecx") | ||
| 90 : | #else | ||
| 91 : | #define CFAREG asm("%edx") | ||
| 92 : | #endif | ||
| 93 : | anton | 1.8 | #else /* gcc-version */ |
| 94 : | /* this works with 2.6.3 (and quite well, too) */ | ||
| 95 : | /* since this is not very demanding, it's the default for other gcc versions */ | ||
| 96 : | pazsan | 1.10 | #if defined(USE_TOS) && !defined(CFA_NEXT) |
| 97 : | #define IPREG asm("%ebx") | ||
| 98 : | #else | ||
| 99 : | anton | 1.8 | #define SPREG asm("%ebx") |
| 100 : | pazsan | 1.10 | #endif /* USE_TOS && !CFA_NEXT */ |
| 101 : | anton | 1.8 | #endif /* gcc-version */ |
| 102 : | anton | 1.4 | #endif /* FORCE_REG */ |
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