Annotation of gforth/m68k.h, revision 1.6

1.4       anton       1: /* This is the machine-specific part for the 68000 and family
1.1       anton       2: 
1.4       anton       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.
1.1       anton      20: */
                     21: 
                     22: #include "32bit.h"
                     23: 
1.3       anton      24: #define FLUSH_ICACHE(addr,size)    cache_$clear()
1.2       anton      25: /* Clearing the whole cache is a bit drastic, but this is the only
                     26:    cache control available on the apollo.
                     27: */
1.3       anton      28: 
                     29: #ifdef DIRECT_THREADED
1.5       anton      30: #warning untested
1.1       anton      31: /* PFA gives the parameter field address corresponding to a cfa */
                     32: #define PFA(cfa)       (((Cell *)cfa)+2)
                     33: /* PFA1 is a special version for use just after a NEXT1 */
                     34: #define PFA1(cfa)      PFA(cfa)
                     35: /* CODE_ADDRESS is the address of the code jumped to through the code field */
                     36: #define CODE_ADDRESS(cfa)      (*(Label *)(((char *)(cfa))+2))
                     37: /* MAKE_CF creates an appropriate code field at the cfa;
                     38:    ca is the code address */
                     39: #define MAKE_CF(cfa,ca)                ({short * _cfa = (short *)cfa; \
                     40:                                  _cfa[0] = 0x4ef9; /* jmp.l */ \
                     41:                                  *(long *)(_cfa+1) = (long)(ca);})
                     42: 
1.6     ! anton      43: /* this is the point where the does code for the word with the xt cfa
        !            44:    starts. */
        !            45: #define DOES_CODE(cfa) \
        !            46:      ({ short *_cfa=(short *)(cfa); \
        !            47:        short *_ca;
        !            48:        ((_cfa[0] == 0x4ef9 \
        !            49:          && (_ca=CODE_ADDRESS(cfa), _ca[0] == 0x4ef9) \
        !            50:          && *(long *)(_cfa+1) == &&docol) \
        !            51:         ? ((unsigned)_ca)+DOES_HANDLER_SIZE \
        !            52:         : 0); })
1.1       anton      53: 
                     54: /* this is a special version of DOES_CODE for use in dodoes */
1.6     ! anton      55: #define DOES_CODE1(cfa)        ((Xt *)(((char *)CODE_ADDRESS(cfa))+DOES_HANDLER_SIZE))
1.1       anton      56: 
1.2       anton      57: /* this stores a call dodoes at addr */
                     58: #define MAKE_DOES_HANDLER(addr) MAKE_CF(addr,symbols[DODOES])
                     59: 
                     60: #define DOES_HANDLER_SIZE       8
                     61: 
                     62: #define MAKE_DOES_CF(addr,doesp)   MAKE_CF(addr,((int)(doesp)-8))
1.1       anton      63: #endif
                     64: 

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