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: /* call to dest+4, because dest will reside in delay slot */
48: #define CALLD(dest,source) (0x40000000|((((unsigned)(dest))+4-(unsigned)(source))>>2))
49:
50: /* PFA gives the parameter field address corresponding to a cfa */
51: #define PFA(cfa) (((Cell *)cfa)+2)
52: /* PFA1 is a special version for use just after a NEXT1 */
53: /* the improvement here is that we may destroy cfa before using PFA1 */
54: #define PFA1(cfa) PFA(cfa)
55: #ifdef undefined
56: #define PFA1(cfa) /* PFA(cfa) */ \
57: ({register Cell *pfa asm("%o7"); \
58: pfa+2; })
59: #endif
60: /* CODE_ADDRESS is the address of the code jumped to through the code field */
61: #define CODE_ADDRESS(cfa) ({unsigned _cfa = (unsigned)(cfa); \
62: (Label)(_cfa+((*(unsigned *)_cfa)<<2)-4);})
63: /* MAKE_CF creates an appropriate code field at the cfa; ca is the code address */
64: /* we use call, since 'branch always' only has 22 bits displacement */
65: #define MAKE_CF(cfa,ca) ({long *_cfa = (long *)(cfa); \
66: unsigned _ca = (unsigned)(ca); \
67: _cfa[0] = CALLD(_ca,_cfa); \
68: _cfa[1] = *(long *)_ca; /* delay slot */})
69:
70: /* this is the point where the does code starts if cfa1 points to a
71: code field of a does>-defined word */
72: /* the +4 is due to the fact, that the does_cf jumps directly to the
73: code address, whereas CODE_ADDRESS expects a jump to
74: code_address+4, and corrects for that (which is countercorrected by
75: the +4) */
76: #define DOES_CODE(cfa1) \
77: ({ Xt _cfa1=(Xt)(cfa1); \
78: unsigned _ca; \
79: ((*(unsigned *)_cfa1)&0xc0000000) == 0x40000000 && \
80: (_ca=((unsigned)CODE_ADDRESS(_cfa1))+4 , \
81: ((*(unsigned *)(_ca)) == CALLD(symbols[DODOES],_ca))) \
82: ? _ca+DOES_HANDLER_SIZE : 0; })
83:
84: /* this is a special version of DOES_CODE for use in dodoes */
85: #define DOES_CODE1(label) ((Xt *)(CODE_ADDRESS(label)+4+DOES_HANDLER_SIZE))
86: #ifdef undefined
87: #define DOES_CODE1(label) ({register Xt *_does_code asm("%o7"); \
88: _does_code+2; })
89: #endif
90:
91: /* this stores a call dodoes at addr */
92: #define MAKE_DOES_HANDLER(addr) MAKE_CF(addr,symbols[DODOES])
93:
94: #define DOES_HANDLER_SIZE 8
95:
96: #define MAKE_DOES_CF(addr,doesp) ({long *_addr = (long *)(addr); \
97: unsigned _doesp = (unsigned)(doesp); \
98: _addr[0] = 0x40000000|((_doesp-8-(unsigned)_addr)>>2); /* CALL doesp-8 */ \
99: _addr[1] = 0x01000000; /* nop */})
100: #endif
101:
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