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Annotation of gforth/arch/m68k/machine.h, revision 1.1

1.1     ! anton       1: /* This is the machine-specific part for the 68000 and family
        !             2: 
        !             3:   Copyright (C) 1995 Free Software Foundation, Inc.
        !             4: 
        !             5:   This file is part of Gforth.
        !             6: 
        !             7:   Gforth is free software; you can redistribute it and/or
        !             8:   modify it under the terms of the GNU General Public License
        !             9:   as published by the Free Software Foundation; either version 2
        !            10:   of the License, or (at your option) any later version.
        !            11: 
        !            12:   This program is distributed in the hope that it will be useful,
        !            13:   but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            14:   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            15:   GNU General Public License for more details.
        !            16: 
        !            17:   You should have received a copy of the GNU General Public License
        !            18:   along with this program; if not, write to the Free Software
        !            19:   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
        !            20: */
        !            21: 
        !            22: #include "../../engine/32bit.h"
        !            23: 
        !            24: /* Clearing the whole cache is a bit drastic, but this is the only
        !            25:  *    cache control available on the apollo and NeXT
        !            26:  */
        !            27: #if defined(apollo)
        !            28: #  define FLUSH_ICACHE(addr,size)    cache_$clear()
        !            29: #elif defined(NeXT)
        !            30: #  define FLUSH_ICACHE(addr,size)     asm("trap #2");
        !            31: #elif defined(hpux)
        !            32: #  include <sys/cache.h>
        !            33: #  define FLUSH_ICACHE(addr,size) cachectl(CC_IPURGE,(addr),(size))
        !            34: #else
        !            35: #  warning no FLUSH_ICACHE defined. If your machine has an I-cache (68020+),
        !            36: #  warning direct threading and CODE words will not work.
        !            37: #endif
        !            38: 
        !            39: #ifdef DIRECT_THREADED
        !            40: #warning untested
        !            41: /* PFA gives the parameter field address corresponding to a cfa */
        !            42: #define PFA(cfa)       (((Cell *)cfa)+2)
        !            43: /* PFA1 is a special version for use just after a NEXT1 */
        !            44: #define PFA1(cfa)      PFA(cfa)
        !            45: /* CODE_ADDRESS is the address of the code jumped to through the code field */
        !            46: #define CODE_ADDRESS(cfa)      (*(Label *)(((char *)(cfa))+2))
        !            47: /* MAKE_CF creates an appropriate code field at the cfa;
        !            48:    ca is the code address */
        !            49: #define MAKE_CF(cfa,ca)                ({short * _cfa = (short *)cfa; \
        !            50:                                  _cfa[0] = 0x4ef9; /* jmp.l */ \
        !            51:                                  *(long *)(_cfa+1) = (long)(ca);})
        !            52: 
        !            53: /* this is the point where the does code for the word with the xt cfa
        !            54:    starts. */
        !            55: #define DOES_CODE(cfa) \
        !            56:      ({ short *_cfa=(short *)(cfa); \
        !            57:        short *_ca; \
        !            58:        ((_cfa[0] == 0x4ef9 \
        !            59:          && (_ca=CODE_ADDRESS(cfa), _ca[0] == 0x4ef9) \
        !            60:          && *(long *)(_cfa+1) == &&docol) \
        !            61:         ? ((unsigned)_ca)+DOES_HANDLER_SIZE \
        !            62:         : 0); })
        !            63: 
        !            64: /* this is a special version of DOES_CODE for use in dodoes */
        !            65: #define DOES_CODE1(cfa)        ((Xt *)(((char *)CODE_ADDRESS(cfa))+DOES_HANDLER_SIZE))
        !            66: 
        !            67: /* this stores a call dodoes at addr */
        !            68: #define MAKE_DOES_HANDLER(addr) MAKE_CF(addr,symbols[DODOES])
        !            69: 
        !            70: #define MAKE_DOES_CF(addr,doesp)   MAKE_CF(addr,((int)(doesp)-8))
        !            71: #endif
        !            72: