Annotation of gforth/arch/m68k/machine.h, revision 1.12
1.1 anton 1: /* This is the machine-specific part for the 68000 and family
2:
1.10 anton 3: Copyright (C) 1995,1996,1997,1998,2000 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
1.11 anton 19: Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
1.1 anton 20: */
21:
1.7 anton 22: #ifndef THREADING_SCHEME
23: #define THREADING_SCHEME 3
24: #endif
25:
1.2 anton 26: /* define this if the processor cannot exploit instruction-level
27: parallelism (no pipelining or too few registers) */
28: #define CISC_NEXT
29:
30: #if !defined USE_NO_TOS && !defined USE_TOS
31: #define USE_TOS
32: #endif
33:
1.3 jwilke 34: #include "../generic/machine.h"
1.8 anton 35: #include <sys/types.h>
1.1 anton 36:
37: /* Clearing the whole cache is a bit drastic, but this is the only
38: * cache control available on the apollo and NeXT
39: */
40: #if defined(apollo)
41: # define FLUSH_ICACHE(addr,size) cache_$clear()
42: #elif defined(NeXT)
43: # define FLUSH_ICACHE(addr,size) asm("trap #2");
44: #elif defined(hpux)
45: # include <sys/cache.h>
46: # define FLUSH_ICACHE(addr,size) cachectl(CC_IPURGE,(addr),(size))
1.2 anton 47: #elif defined(linux)
48: #include <asm/cachectl.h>
49: extern int cacheflush(void *, int, int, size_t);
50: #define FLUSH_ICACHE(addr,size) \
51: cacheflush(addr, FLUSH_SCOPE_LINE, FLUSH_CACHE_INSN, (size_t)(size) + 15)
1.4 anton 52: #elif defined(amigaos)
53: # define FLUSH_ICACHE(addr,size) \
54: asm(" move.l a6,-(sp); \
55: move.l _SysBase,a6; \
56: jsr -636(a6); \
57: move.l (sp)+,a6; \
58: ")
1.1 anton 59: #else
60: # warning no FLUSH_ICACHE defined. If your machine has an I-cache (68020+),
61: # warning direct threading and CODE words will not work.
62: #endif
63:
64: #ifdef DIRECT_THREADED
65: /* PFA gives the parameter field address corresponding to a cfa */
1.2 anton 66: #define PFA(cfa) ((Cell *)(cfa)+2)
1.1 anton 67: /* PFA1 is a special version for use just after a NEXT1 */
68: #define PFA1(cfa) PFA(cfa)
69: /* CODE_ADDRESS is the address of the code jumped to through the code field */
1.9 anton 70: #define CODE_ADDRESS1(cfa) (*(Label *)((char *)(cfa)+2))
71: #define CODE_ADDRESS(cfa) ({ \
72: short *__cfa=(short *)(cfa); \
73: (*__cfa == 0x4ef9) ? CODE_ADDRESS1(__cfa): (Label)__cfa; \
74: })
75:
1.1 anton 76: /* MAKE_CF creates an appropriate code field at the cfa;
77: ca is the code address */
1.2 anton 78: #define MAKE_CF(cfa,ca) ({short * _cfa = (short *)(cfa); \
79: long _ca = (long)(ca); \
1.1 anton 80: _cfa[0] = 0x4ef9; /* jmp.l */ \
1.2 anton 81: *(long *)(_cfa+1) = _ca;})
1.1 anton 82:
83: /* this is the point where the does code for the word with the xt cfa
84: starts. */
85: #define DOES_CODE(cfa) \
86: ({ short *_cfa=(short *)(cfa); \
1.2 anton 87: short *_ca=CODE_ADDRESS(_cfa); \
1.9 anton 88: ((_ca[0] == 0x4ef9 && CODE_ADDRESS1(_ca) == &&dodoes) \
1.1 anton 89: ? ((unsigned)_ca)+DOES_HANDLER_SIZE \
90: : 0); })
91:
92: /* this is a special version of DOES_CODE for use in dodoes */
1.9 anton 93: #define DOES_CODE1(cfa) ((Xt *)(((char *)CODE_ADDRESS1(cfa))+DOES_HANDLER_SIZE))
1.1 anton 94:
95: /* this stores a call dodoes at addr */
96: #define MAKE_DOES_HANDLER(addr) MAKE_CF(addr,symbols[DODOES])
97:
98: #define MAKE_DOES_CF(addr,doesp) MAKE_CF(addr,((int)(doesp)-8))
99: #endif
100:
1.2 anton 101: #ifdef FORCE_REG /* highly recommended */
1.4 anton 102: #if defined(amigaos)
1.5 pazsan 103: # define IPREG asm("%a6")
1.4 anton 104: #else
1.5 pazsan 105: # define IPREG asm("%a5")
1.4 anton 106: #endif
1.2 anton 107: #define SPREG asm("%a4")
108: #define RPREG asm("%a3")
109: #define CFAREG asm("%a2")
110: #define TOSREG asm("%d3")
111: #define LPREG asm("%d2")
112: #endif
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