Annotation of gforth/sparc.h, revision 1.7
1.1 anton 1: /*
2: Copyright 1992 by the ANSI figForth Development Group
3:
1.3 anton 4: This is the machine-specific part for a SPARC
1.1 anton 5: */
1.5 anton 6:
7: #include "32bit.h"
1.4 anton 8:
9: #if !defined(USE_TOS) && !defined(USE_NO_TOS)
10: #define USE_TOS
11: #endif
1.1 anton 12:
1.3 anton 13: /* direct threading is probably faster on the SPARC, but has it been
14: tested? Therefore, DIRECT_THREADED is not defined */
1.1 anton 15:
16: #ifdef DIRECT_THREADED
1.7 ! anton 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:
1.1 anton 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 */
1.6 anton 36: #define PFA1(cfa) PFA(cfa)
37: #ifdef undefined
1.1 anton 38: #define PFA1(cfa) /* PFA(cfa) */ \
1.6 anton 39: ({register Cell *pfa asm("%o7"); \
1.1 anton 40: pfa+2; })
1.6 anton 41: #endif
1.1 anton 42: /* CODE_ADDRESS is the address of the code jumped to through the code field */
1.6 anton 43: #define CODE_ADDRESS(cfa) ({unsigned _cfa = (unsigned)(cfa); \
44: (Label)(_cfa+((*(unsigned *)_cfa)<<2));})
1.1 anton 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); \
1.6 anton 49: _cfa[0] = 0x40000000|((_ca+4-(unsigned)_cfa)>>2); /* CALL ca */ \
1.1 anton 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 */
1.6 anton 54: #define DOES_CODE(label) ((Xt *)(CODE_ADDRESS(label)+DOES_HANDLER_SIZE))
1.1 anton 55:
56: /* this is a special version of DOES_CODE for use in dodoes */
1.6 anton 57: #define DOES_CODE1(label) DOES_CODE(label)
58: #ifdef undefined
59: #define DOES_CODE1(label) ({register Xt *_does_code asm("%o7"); \
1.1 anton 60: _does_code+2; })
1.6 anton 61: #endif
1.1 anton 62:
63: /* this stores a call dodoes at addr */
1.6 anton 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 */})
1.3 anton 72: #endif
1.6 anton 73:
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