1: /*
2: Copyright 1992 by the ANSI figForth Development Group
3:
4: This is the machine-specific part for a SPARC
5: */
6:
7: #include "32bit.h"
8:
9: #if !defined(USE_TOS) && !defined(USE_NO_TOS)
10: #define USE_TOS
11: #endif
12:
13: /* direct threading is probably faster on the SPARC, but has it been
14: tested? Therefore, DIRECT_THREADED is not defined */
15:
16: #ifdef DIRECT_THREADED
17: #ifndef WORDS_BIGENDIAN
18: #error Direct threading only supported for big-endian machines.
19: /* little endian SPARCs still store instructions in big-endian format,
20: so you would have to reverse the instructions stores in the following
21: */
22: #endif
23:
24: #ifdef undefined
25: /* according to the SPARC V9 architecture manual, we have to use flush,
26: but as V2.20 does not recognize the opcode */
27: /* assuming size = 8 */
28: #define CACHE_FLUSH(addr,size) \
29: asm("flush %0; flush %0+4"::"r"(addr))
30: #endif
31:
32: /* PFA gives the parameter field address corresponding to a cfa */
33: #define PFA(cfa) (((Cell *)cfa)+2)
34: /* PFA1 is a special version for use just after a NEXT1 */
35: /* the improvement here is that we may destroy cfa before using PFA1 */
36: #define PFA1(cfa) PFA(cfa)
37: #ifdef undefined
38: #define PFA1(cfa) /* PFA(cfa) */ \
39: ({register Cell *pfa asm("%o7"); \
40: pfa+2; })
41: #endif
42: /* CODE_ADDRESS is the address of the code jumped to through the code field */
43: #define CODE_ADDRESS(cfa) ({unsigned _cfa = (unsigned)(cfa); \
44: (Label)(_cfa+((*(unsigned *)_cfa)<<2));})
45: /* MAKE_CF creates an appropriate code field at the cfa; ca is the code address */
46: /* we use call, since 'branch always' only has 22 bits displacement */
47: #define MAKE_CF(cfa,ca) ({long *_cfa = (long *)(cfa); \
48: unsigned _ca = (unsigned)(ca); \
49: _cfa[0] = 0x40000000|((_ca+4-(unsigned)_cfa)>>2); /* CALL ca */ \
50: _cfa[1] = *(long *)_ca; /* delay slot */})
51:
52: /* this is the point where the does code starts if label points to the
53: * jump dodoes */
54: #define DOES_CODE(label) ((Xt *)(CODE_ADDRESS(label)+DOES_HANDLER_SIZE))
55:
56: /* this is a special version of DOES_CODE for use in dodoes */
57: #define DOES_CODE1(label) DOES_CODE(label)
58: #ifdef undefined
59: #define DOES_CODE1(label) ({register Xt *_does_code asm("%o7"); \
60: _does_code+2; })
61: #endif
62:
63: /* this stores a call dodoes at addr */
64: #define MAKE_DOES_HANDLER(addr) MAKE_CF(addr,symbols[DODOES])
65:
66: #define DOES_HANDLER_SIZE 8
67:
68: #define MAKE_DOES_CF(addr,doesp) ({long *_addr = (long *)(addr); \
69: unsigned _doesp = (unsigned)(doesp); \
70: _addr[0] = 0x40000000|((_doesp-8-(unsigned)_addr)>>2); /* CALL doesp-8 */ \
71: _addr[1] = 0x01000000; /* nop */})
72: #endif
73:
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