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Annotation of gforth/sparc.h, revision 1.5

1.1       anton       1: /*
1.5     ! anton       2:   $Id: sparc.h,v 1.4 1994/12/14 16:15:33 anton Exp $
1.1       anton       3:   Copyright 1992 by the ANSI figForth Development Group
                      4: 
1.3       anton       5:   This is the machine-specific part for a SPARC
1.1       anton       6: */
1.5     ! anton       7: 
        !             8: #include "32bit.h"
1.4       anton       9: 
                     10: #if !defined(USE_TOS) && !defined(USE_NO_TOS)
                     11: #define USE_TOS
                     12: #endif
1.1       anton      13: 
1.3       anton      14: /* direct threading is probably faster on the SPARC, but has it been
                     15:    tested? Therefore, DIRECT_THREADED is not defined */
1.1       anton      16: 
                     17: #ifdef DIRECT_THREADED
                     18: /* PFA gives the parameter field address corresponding to a cfa */
                     19: #define PFA(cfa)       (((Cell *)cfa)+2)
                     20: /* PFA1 is a special version for use just after a NEXT1 */
                     21: /* the improvement here is that we may destroy cfa before using PFA1 */
                     22: #define PFA1(cfa)      /* PFA(cfa) */ \
                     23:                        ({register Cell *pfa asm("%15"); \
                     24:                          pfa+2; })
                     25: /* CODE_ADDRESS is the address of the code jumped to through the code field */
                     26: #define CODE_ADDRESS(cfa)      ((Label)((*(unsigned *)(cfa))<<2))
                     27: /* MAKE_CF creates an appropriate code field at the cfa; ca is the code address */
                     28: /* we use call, since 'branch always' only has 22 bits displacement */
                     29: #define MAKE_CF(cfa,ca)        ({long *_cfa        = (long *)(cfa); \
                     30:                          unsigned _ca = (unsigned)(ca); \
                     31:                          _cfa[0] = 0x8000000|((_ca+4-(unsigned)_cfa)>>2) /* CALL ca */ \
                     32:                          _cfa[1] = *(long *)_ca; /* delay slot */})
                     33: 
                     34: /* this is the point where the does code starts if label points to the
                     35:  * jump dodoes */
                     36: #define DOES_CODE(label)       (((Xt *)(label))+2)
                     37: 
                     38: /* this is a special version of DOES_CODE for use in dodoes */
                     39: #define DOES_CODE1(label)      ({register Xt *_does_code asm("%15"); \
                     40:                                _does_code+2; })
                     41: 
                     42: /* this stores a call dodoes at addr */
                     43: #define MAKE_DOESJUMP(addr)    ({long *_addr = (long *)(addr); \
                     44:                                  _addr[0] = 0x8000000|((((unsigned)&&dodoes)+4-((unsigned)_addr))>>2) /* CALL dodoes */ \
                     45:                          _addr[1] = *(long *)&&dodoes; /* delay slot */})
1.3       anton      46: #endif