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Annotation of gforth/arch/m68k/machine.h, revision 1.6

1.1       anton       1: /* This is the machine-specific part for the 68000 and family
                      2: 
1.6     ! anton       3:   Copyright (C) 1995,1996,1997,1998 Free Software Foundation, Inc.
1.1       anton       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: 
1.2       anton      22: /* direct threading is faster at least on 68030 */
                     23: #if !defined INDIRECT_THREADED && !defined DIRECT_THREADED
                     24: #define DIRECT_THREADED
                     25: #endif
                     26: 
                     27: /* define this if the processor cannot exploit instruction-level
                     28:    parallelism (no pipelining or too few registers) */
                     29: #define CISC_NEXT
                     30: 
                     31: #if !defined USE_NO_TOS && !defined USE_TOS
                     32: #define USE_TOS
                     33: #endif
                     34: 
                     35: #define AUTO_INCREMENT
                     36: 
                     37: 
1.3       jwilke     38: #include "../generic/machine.h"
1.1       anton      39: 
                     40: /* Clearing the whole cache is a bit drastic, but this is the only
                     41:  *    cache control available on the apollo and NeXT
                     42:  */
                     43: #if defined(apollo)
                     44: #  define FLUSH_ICACHE(addr,size)    cache_$clear()
                     45: #elif defined(NeXT)
                     46: #  define FLUSH_ICACHE(addr,size)     asm("trap #2");
                     47: #elif defined(hpux)
                     48: #  include <sys/cache.h>
                     49: #  define FLUSH_ICACHE(addr,size) cachectl(CC_IPURGE,(addr),(size))
1.2       anton      50: #elif defined(linux)
                     51: #include <asm/cachectl.h>
                     52: extern int cacheflush(void *, int, int, size_t);
                     53: #define FLUSH_ICACHE(addr,size) \
                     54:   cacheflush(addr, FLUSH_SCOPE_LINE, FLUSH_CACHE_INSN, (size_t)(size) + 15)
1.4       anton      55: #elif defined(amigaos)
                     56: #  define FLUSH_ICACHE(addr,size) \
                     57:   asm(" move.l a6,-(sp); \
                     58:         move.l _SysBase,a6; \
                     59:         jsr -636(a6); \
                     60:         move.l (sp)+,a6; \
                     61:   ")
1.1       anton      62: #else
                     63: #  warning no FLUSH_ICACHE defined. If your machine has an I-cache (68020+),
                     64: #  warning direct threading and CODE words will not work.
                     65: #endif
                     66: 
                     67: #ifdef DIRECT_THREADED
                     68: /* PFA gives the parameter field address corresponding to a cfa */
1.2       anton      69: #define PFA(cfa)       ((Cell *)(cfa)+2)
1.1       anton      70: /* PFA1 is a special version for use just after a NEXT1 */
                     71: #define PFA1(cfa)      PFA(cfa)
                     72: /* CODE_ADDRESS is the address of the code jumped to through the code field */
1.2       anton      73: #define CODE_ADDRESS(cfa)      (*(Label *)((char *)(cfa)+2))
1.1       anton      74: /* MAKE_CF creates an appropriate code field at the cfa;
                     75:    ca is the code address */
1.2       anton      76: #define MAKE_CF(cfa,ca)                ({short * _cfa = (short *)(cfa); \
                     77:                                  long _ca = (long)(ca); \
1.1       anton      78:                                  _cfa[0] = 0x4ef9; /* jmp.l */ \
1.2       anton      79:                                  *(long *)(_cfa+1) = _ca;})
1.1       anton      80: 
                     81: /* this is the point where the does code for the word with the xt cfa
                     82:    starts. */
                     83: #define DOES_CODE(cfa) \
                     84:      ({ short *_cfa=(short *)(cfa); \
1.2       anton      85:        short *_ca=CODE_ADDRESS(_cfa); \
1.1       anton      86:        ((_cfa[0] == 0x4ef9 \
1.2       anton      87:          && _ca[0] == 0x4ef9 && CODE_ADDRESS(_ca) == &&dodoes) \
1.1       anton      88:         ? ((unsigned)_ca)+DOES_HANDLER_SIZE \
                     89:         : 0); })
                     90: 
                     91: /* this is a special version of DOES_CODE for use in dodoes */
                     92: #define DOES_CODE1(cfa)        ((Xt *)(((char *)CODE_ADDRESS(cfa))+DOES_HANDLER_SIZE))
                     93: 
                     94: /* this stores a call dodoes at addr */
                     95: #define MAKE_DOES_HANDLER(addr) MAKE_CF(addr,symbols[DODOES])
                     96: 
                     97: #define MAKE_DOES_CF(addr,doesp)   MAKE_CF(addr,((int)(doesp)-8))
                     98: #endif
                     99: 
1.2       anton     100: #ifdef FORCE_REG /* highly recommended */
1.4       anton     101: #if defined(amigaos)
1.5       pazsan    102: #  define IPREG asm("%a6")
1.4       anton     103: #else
1.5       pazsan    104: #  define IPREG asm("%a5")
1.4       anton     105: #endif
1.2       anton     106: #define SPREG asm("%a4")
                    107: #define RPREG asm("%a3")
                    108: #define CFAREG asm("%a2")
                    109: #define TOSREG asm("%d3")
                    110: #define LPREG asm("%d2")
                    111: #endif