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minor changes

    1: /* This is the machine-specific part for a SPARC
    2: 
    3:   Copyright (C) 1995 Free Software Foundation, Inc.
    4: 
    5:   This file is part of Gforth.
    6: 
    7:   Gforth is free software; you can redistribute it and/or
    8:   modify it under the terms of the GNU General Public License
    9:   as published by the Free Software Foundation; either version 2
   10:   of the License, or (at your option) any later version.
   11: 
   12:   This program is distributed in the hope that it will be useful,
   13:   but WITHOUT ANY WARRANTY; without even the implied warranty of
   14:   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   15:   GNU General Public License for more details.
   16: 
   17:   You should have received a copy of the GNU General Public License
   18:   along with this program; if not, write to the Free Software
   19:   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   20: */
   21: 
   22: #include "32bit.h"
   23: 
   24: #if !defined(USE_TOS) && !defined(USE_NO_TOS)
   25: #define USE_TOS
   26: #endif
   27: 
   28: #if !defined(INDIRECT_THREADED) && !defined(DIRECT_THREADED)
   29: #define DIRECT_THREADED
   30: #endif
   31: 
   32: #define FLUSH_ICACHE(addr,size) \
   33:   ({void *_addr=(addr); void *_end=_addr+((Cell)(size)); \
   34:     for (_addr=((long)_addr)&~7; _addr<_end; _addr += 8) \
   35:        asm("iflush %0+0"::"r"(_addr)); \
   36:    })
   37: /* the +0 in the iflush instruction is needed by gas */
   38: 
   39: #ifdef DIRECT_THREADED
   40: #ifndef WORDS_BIGENDIAN
   41: #error Direct threading only supported for big-endian SPARCs.
   42: /* little endian SPARCs still store instructions in big-endian format,
   43:    so you would have to reverse the instructions stores in the following
   44: */
   45: #endif
   46: 
   47: /* PFA gives the parameter field address corresponding to a cfa */
   48: #define PFA(cfa)	(((Cell *)cfa)+2)
   49: /* PFA1 is a special version for use just after a NEXT1 */
   50: /* the improvement here is that we may destroy cfa before using PFA1 */
   51: #define PFA1(cfa)	PFA(cfa)
   52: #ifdef undefined
   53: #define PFA1(cfa)	/* PFA(cfa) */ \
   54: 			({register Cell *pfa asm("%o7"); \
   55: 			  pfa+2; })
   56: #endif
   57: /* CODE_ADDRESS is the address of the code jumped to through the code field */
   58: #define CODE_ADDRESS(cfa)	({unsigned _cfa = (unsigned)(cfa); \
   59: 				    (Label)(_cfa+((*(unsigned *)_cfa)<<2)-4);})
   60: /* MAKE_CF creates an appropriate code field at the cfa; ca is the code address */
   61: /* we use call, since 'branch always' only has 22 bits displacement */
   62: #define MAKE_CF(cfa,ca)	({long *_cfa        = (long *)(cfa); \
   63: 			  unsigned _ca = (unsigned)(ca); \
   64: 			  _cfa[0] = 0x40000000|((_ca+4-(unsigned)_cfa)>>2); /* CALL ca */ \
   65: 			  _cfa[1] = *(long *)_ca; /* delay slot */})
   66: 
   67: /* this is the point where the does code starts if label points to the
   68:  * jump dodoes */
   69: /* the +4 is due to the fact, that the does_cf jumps directly to the
   70:    code address, whereas CODE_ADDRESS expects a jump to
   71:    code_address+4, and corrects for that (which is countercorrected by
   72:    the +4) */
   73: #define DOES_CODE(label)	((Xt *)(CODE_ADDRESS(label)+4+DOES_HANDLER_SIZE))
   74: 
   75: /* this is a special version of DOES_CODE for use in dodoes */
   76: #define DOES_CODE1(label)	DOES_CODE(label)
   77: #ifdef undefined
   78: #define DOES_CODE1(label)	({register Xt *_does_code asm("%o7"); \
   79: 			  	_does_code+2; })
   80: #endif
   81: 
   82: /* this stores a call dodoes at addr */
   83: #define MAKE_DOES_HANDLER(addr) MAKE_CF(addr,symbols[DODOES])
   84: 
   85: #define DOES_HANDLER_SIZE       8
   86: 
   87: #define MAKE_DOES_CF(addr,doesp) ({long *_addr        = (long *)(addr); \
   88: 			  unsigned _doesp = (unsigned)(doesp); \
   89: 			  _addr[0] = 0x40000000|((_doesp-8-(unsigned)_addr)>>2); /* CALL doesp-8 */ \
   90: 			  _addr[1] = 0x01000000; /* nop */})
   91: #endif
   92: