File:  [gforth] / gforth / Attic / 386.h
Revision 1.10: download - view: text, annotated - select for diffs
Thu Oct 26 22:48:38 1995 UTC (25 years, 8 months ago) by pazsan
Branches: MAIN
CVS tags: HEAD
Changed threading ifdefs.
Requires debugging !!!!!!
Perhaps change concepts with LONG_LATENCY
on RISCs.
Added sokoban.fs as a nice little game.

    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: 
    7: #include "32bit.h"
    8: 
    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 */
   12: 
   13: /* define this if the processor cannot exploit instruction-level
   14:    parallelism (no pipelining or too few registers) */
   15: #define CISC_NEXT
   16: 
   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)
   21: 
   22: #ifdef DIRECT_THREADED
   23: 
   24: #define CALL 0xe8 /* call */
   25: #define JMP  0xe9 /* jmp  */
   26: #define GETCFA(reg)  ({ asm("popl %0" : "=r" (reg)); (int)reg -= 5;});
   27: 
   28: /* PFA gives the parameter field address corresponding to a cfa */
   29: #define PFA(cfa)	(((Cell *)cfa)+2)
   30: /* PFA1 is a special version for use just after a NEXT1 */
   31: #define PFA1(cfa)	PFA(cfa)
   32: /* CODE_ADDRESS is the address of the code jumped to through the code field */
   33: #define CODE_ADDRESS(cfa) \
   34:     ({long _cfa = (long)(cfa); (Label)(_cfa+*((long *)(_cfa+1))+5);})
   35: /* MAKE_CF creates an appropriate code field at the cfa; ca is the code address */
   36: #define MAKE_CF(cfa,ca)	({long _cfa = (long)(cfa); \
   37:                           long _ca  = (long)(ca); \
   38: 			  *(char *)_cfa = CALL; \
   39: 			  *(long *)(_cfa+1) = _ca-(_cfa+5);})
   40: 
   41: /* this is the point where the does code starts if label points to the
   42:  * jump dodoes */
   43: #define DOES_HANDLER_SIZE       8
   44: #define DOES_CODE(label)	((Xt *)(CODE_ADDRESS(label)+DOES_HANDLER_SIZE))
   45: 
   46: /* this is a special version of DOES_CODE for use in dodoes */
   47: #define DOES_CODE1(label)	DOES_CODE(label)
   48: 
   49: /* this stores a jump dodoes at addr */
   50: #define MAKE_DOES_CF(addr,doesp)	({long _addr = (long)(addr); \
   51:                           long _doesp  = (long)(doesp)-8; \
   52: 			  *(char *)_addr = CALL; \
   53: 			  *(long *)(_addr+1) = _doesp-(_addr+5);})
   54: 
   55: #define MAKE_DOES_HANDLER(addr)	({long _addr = (long)(addr); \
   56:                           long _dodo  = (long)symbols[DODOES]; \
   57: 			  *(char *)_addr = JMP; \
   58: 			  *(long *)(_addr+1) = _dodo-(_addr+5);})
   59: #endif
   60: 
   61: #ifdef FORCE_REG
   62: #if (__GNUC__==2 && defined(__GNUC_MINOR__) && __GNUC_MINOR__==5)
   63: /* i.e. gcc-2.5.x */
   64: /* this works with 2.5.7; nothing works with 2.5.8 */
   65: #define IPREG asm("%esi")
   66: #define SPREG asm("%edi")
   67: #ifdef USE_TOS
   68: #define CFAREG asm("%ecx")
   69: #else
   70: #define CFAREG asm("%edx")
   71: #endif
   72: #else /* gcc-version */
   73: /* this works with 2.6.3 (and quite well, too) */
   74: /* since this is not very demanding, it's the default for other gcc versions */
   75: #if defined(USE_TOS) && !defined(CFA_NEXT)
   76: #define IPREG asm("%ebx")
   77: #else
   78: #define SPREG asm("%ebx")
   79: #endif /* USE_TOS && !CFA_NEXT */
   80: #endif /* gcc-version */
   81: #endif /* FORCE_REG */

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