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Annotation of gforth/386.h, revision 1.9

1.1       anton       1: /*
                      2:   Copyright 1992 by the ANSI figForth Development Group
                      3: 
                      4:   This is the machine-specific part for Intel 386 compatible processors
                      5: */
                      6: 
1.7       anton       7: #include "32bit.h"
1.1       anton       8: 
1.7       anton       9: /* indirect threading is faster on the 486, on the 386 direct
                     10:    threading is probably faster. Therefore we leave defining
                     11:    DIRECT_THREADED to configure */
1.1       anton      12: 
1.3       anton      13: /* define this if the processor cannot exploit instruction-level
1.4       anton      14:    parallelism (no pipelining or too few registers) */
1.3       anton      15: #define CISC_NEXT
                     16: 
1.9     ! anton      17: /* 386 and below have no cache, 486 has a shared cache, and the
        !            18:    Pentium probably employs hardware cache consistency, so
        !            19:    flush-icache is a noop */
        !            20: #define FLUSH_ICACHE(addr,size) 0
        !            21: 
1.1       anton      22: #ifdef DIRECT_THREADED
                     23: /* PFA gives the parameter field address corresponding to a cfa */
                     24: #define PFA(cfa)       (((Cell *)cfa)+2)
                     25: /* PFA1 is a special version for use just after a NEXT1 */
                     26: #define PFA1(cfa)      PFA(cfa)
                     27: /* CODE_ADDRESS is the address of the code jumped to through the code field */
1.2       pazsan     28: #define CODE_ADDRESS(cfa) \
1.5       anton      29:     ({long _cfa = (long)(cfa); (Label)(_cfa+*((long *)(_cfa+1))+5);})
1.1       anton      30: /* MAKE_CF creates an appropriate code field at the cfa; ca is the code address */
1.2       pazsan     31: #define MAKE_CF(cfa,ca)        ({long _cfa = (long)(cfa); \
                     32:                           long _ca  = (long)(ca); \
1.1       anton      33:                          *(char *)_cfa = 0xe9; /* jmp */ \
1.2       pazsan     34:                          *(long *)(_cfa+1) = _ca-(_cfa+5);})
1.1       anton      35: 
                     36: /* this is the point where the does code starts if label points to the
                     37:  * jump dodoes */
1.2       pazsan     38: #define DOES_HANDLER_SIZE       8
                     39: #define DOES_CODE(label)       ((Xt *)(CODE_ADDRESS(label)+DOES_HANDLER_SIZE))
1.1       anton      40: 
                     41: /* this is a special version of DOES_CODE for use in dodoes */
                     42: #define DOES_CODE1(label)      DOES_CODE(label)
                     43: 
                     44: /* this stores a jump dodoes at addr */
1.2       pazsan     45: #define MAKE_DOES_HANDLER(addr) MAKE_CF(addr,symbols[DODOES])
                     46: 
                     47: #define MAKE_DOES_CF(addr,doesp) MAKE_CF(addr,((int)(doesp)-8))
1.1       anton      48: #endif
1.4       anton      49: 
                     50: #ifdef FORCE_REG
1.8       anton      51: #if (__GNUC__==2 && defined(__GNUC_MINOR__) && __GNUC_MINOR__==5)
                     52: /* i.e. gcc-2.5.x */
                     53: /* this works with 2.5.7; nothing works with 2.5.8 */
1.4       anton      54: #define IPREG asm("%esi")
                     55: #define SPREG asm("%edi")
                     56: #ifdef USE_TOS
                     57: #define CFAREG asm("%ecx")
                     58: #else
                     59: #define CFAREG asm("%edx")
                     60: #endif
1.8       anton      61: #else /* gcc-version */
                     62: /* this works with 2.6.3 (and quite well, too) */
                     63: /* since this is not very demanding, it's the default for other gcc versions */
                     64: #define SPREG asm("%ebx")
                     65: #endif /* gcc-version */
1.4       anton      66: #endif /* FORCE_REG */