Annotation of gforth/386.h, revision 1.8
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:
1.1 anton 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: #define PFA1(cfa) PFA(cfa)
22: /* CODE_ADDRESS is the address of the code jumped to through the code field */
1.2 pazsan 23: #define CODE_ADDRESS(cfa) \
1.5 anton 24: ({long _cfa = (long)(cfa); (Label)(_cfa+*((long *)(_cfa+1))+5);})
1.1 anton 25: /* MAKE_CF creates an appropriate code field at the cfa; ca is the code address */
1.2 pazsan 26: #define MAKE_CF(cfa,ca) ({long _cfa = (long)(cfa); \
27: long _ca = (long)(ca); \
1.1 anton 28: *(char *)_cfa = 0xe9; /* jmp */ \
1.2 pazsan 29: *(long *)(_cfa+1) = _ca-(_cfa+5);})
1.1 anton 30:
31: /* this is the point where the does code starts if label points to the
32: * jump dodoes */
1.2 pazsan 33: #define DOES_HANDLER_SIZE 8
34: #define DOES_CODE(label) ((Xt *)(CODE_ADDRESS(label)+DOES_HANDLER_SIZE))
1.1 anton 35:
36: /* this is a special version of DOES_CODE for use in dodoes */
37: #define DOES_CODE1(label) DOES_CODE(label)
38:
39: /* this stores a jump dodoes at addr */
1.2 pazsan 40: #define MAKE_DOES_HANDLER(addr) MAKE_CF(addr,symbols[DODOES])
41:
42: #define MAKE_DOES_CF(addr,doesp) MAKE_CF(addr,((int)(doesp)-8))
1.1 anton 43: #endif
1.4 anton 44:
45: #ifdef FORCE_REG
1.8 ! anton 46: #if (__GNUC__==2 && defined(__GNUC_MINOR__) && __GNUC_MINOR__==5)
! 47: /* i.e. gcc-2.5.x */
! 48: /* this works with 2.5.7; nothing works with 2.5.8 */
1.4 anton 49: #define IPREG asm("%esi")
50: #define SPREG asm("%edi")
51: #ifdef USE_TOS
52: #define CFAREG asm("%ecx")
53: #else
54: #define CFAREG asm("%edx")
55: #endif
1.8 ! anton 56: #else /* gcc-version */
! 57: /* this works with 2.6.3 (and quite well, too) */
! 58: /* since this is not very demanding, it's the default for other gcc versions */
! 59: #define SPREG asm("%ebx")
! 60: #endif /* gcc-version */
1.4 anton 61: #endif /* FORCE_REG */
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