Diff for /gforth/Attic/386.h between versions 1.9 and 1.14

version 1.9, 1995/10/11 19:39:31 version 1.14, 1996/08/21 14:58:37
Line 1 Line 1
 /*  /*
   Copyright 1992 by the ANSI figForth Development Group  
   
   This is the machine-specific part for Intel 386 compatible processors    This is the machine-specific part for Intel 386 compatible processors
   
     Copyright (C) 1995 Free Software Foundation, Inc.
   
     This file is part of Gforth.
   
     Gforth is free software; you can redistribute it and/or
     modify it under the terms of the GNU General Public License
     as published by the Free Software Foundation; either version 2
     of the License, or (at your option) any later version.
   
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
   
     You should have received a copy of the GNU General Public License
     along with this program; if not, write to the Free Software
     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */  */
   
 #include "32bit.h"  #include "32bit.h"
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 /* 386 and below have no cache, 486 has a shared cache, and the  /* 386 and below have no cache, 486 has a shared cache, and the
    Pentium probably employs hardware cache consistency, so     Pentium probably employs hardware cache consistency, so
    flush-icache is a noop */     flush-icache is a noop */
 #define FLUSH_ICACHE(addr,size) 0  #define FLUSH_ICACHE(addr,size)
   
 #ifdef DIRECT_THREADED  #ifdef DIRECT_THREADED
   
   #define CALL 0xe8 /* call */
   #define JMP  0xe9 /* jmp  */
   #define GETCFA(reg)  ({ asm("popl %0" : "=r" (reg)); (int)reg -= 5;});
   
 /* PFA gives the parameter field address corresponding to a cfa */  /* PFA gives the parameter field address corresponding to a cfa */
 #define PFA(cfa)        (((Cell *)cfa)+2)  #define PFA(cfa)        (((Cell *)cfa)+2)
 /* PFA1 is a special version for use just after a NEXT1 */  /* PFA1 is a special version for use just after a NEXT1 */
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 /* MAKE_CF creates an appropriate code field at the cfa; ca is the code address */  /* MAKE_CF creates an appropriate code field at the cfa; ca is the code address */
 #define MAKE_CF(cfa,ca) ({long _cfa = (long)(cfa); \  #define MAKE_CF(cfa,ca) ({long _cfa = (long)(cfa); \
                           long _ca  = (long)(ca); \                            long _ca  = (long)(ca); \
                           *(char *)_cfa = 0xe9; /* jmp */ \                            *(char *)_cfa = CALL; \
                           *(long *)(_cfa+1) = _ca-(_cfa+5);})                            *(long *)(_cfa+1) = _ca-(_cfa+5);})
   
 /* this is the point where the does code starts if label points to the  /* this is the point where the does code starts if label points to the
  * jump dodoes */   * jump dodoes */
 #define DOES_HANDLER_SIZE       8  #define DOES_HANDLER_SIZE       8
 #define DOES_CODE(label)        ((Xt *)(CODE_ADDRESS(label)+DOES_HANDLER_SIZE))  #define DOES_CODE(xt) \
   ({ long _xt = (long)(xt); \
      long _ca = (long)(CODE_ADDRESS(_xt)); \
      ((((*(unsigned char *)_xt) == CALL) \
        && ((*(unsigned char *)_ca) == JMP) \
        && ((long)(CODE_ADDRESS(_ca)) == (long)&&dodoes)) \
       ? _ca+DOES_HANDLER_SIZE : 0L); })
   
 /* this is a special version of DOES_CODE for use in dodoes */  /* this is a special version of DOES_CODE for use in dodoes */
 #define DOES_CODE1(label)       DOES_CODE(label)  #define DOES_CODE1(label)      (CODE_ADDRESS(label)+DOES_HANDLER_SIZE)
   
 /* this stores a jump dodoes at addr */  /* this stores a jump dodoes at addr */
 #define MAKE_DOES_HANDLER(addr) MAKE_CF(addr,symbols[DODOES])  #define MAKE_DOES_CF(addr,doesp)        ({long _addr = (long)(addr); \
                             long _doesp  = (long)(doesp)-8; \
 #define MAKE_DOES_CF(addr,doesp) MAKE_CF(addr,((int)(doesp)-8))                            *(char *)_addr = CALL; \
                             *(long *)(_addr+1) = _doesp-(_addr+5);})
   
   #define MAKE_DOES_HANDLER(addr) ({long _addr = (long)(addr); \
                             long _dodo  = (long)symbols[DODOES]; \
                             *(char *)_addr = JMP; \
                             *(long *)(_addr+1) = _dodo-(_addr+5);})
 #endif  #endif
   
 #ifdef FORCE_REG  #ifdef FORCE_REG
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 #else /* gcc-version */  #else /* gcc-version */
 /* this works with 2.6.3 (and quite well, too) */  /* this works with 2.6.3 (and quite well, too) */
 /* since this is not very demanding, it's the default for other gcc versions */  /* since this is not very demanding, it's the default for other gcc versions */
   #if defined(USE_TOS) && !defined(CFA_NEXT)
   #define IPREG asm("%ebx")
   #else
 #define SPREG asm("%ebx")  #define SPREG asm("%ebx")
   #endif /* USE_TOS && !CFA_NEXT */
 #endif /* gcc-version */  #endif /* gcc-version */
 #endif /* FORCE_REG */  #endif /* FORCE_REG */

Removed from v.1.9  
changed lines
  Added in v.1.14


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