Annotation of gforth/mips.h, revision 1.4
1.1 anton 1: /*
2: Copyright 1992 by the ANSI figForth Development Group
3:
4: This is the machine-specific part for MIPS R[2346810]000 processors
5: */
1.2 anton 6:
7: #if !defined(USE_TOS) && !defined(USE_NO_TOS)
8: /* on the mips this is a mixed blessing, since defining this spills
9: the rp with some gcc versions. This machine has 31 regs, yet that's
10: not enough for gcc-2.4.5 :-( */
11: #define USE_TOS
12: #endif
13:
1.1 anton 14: /* cache flush stuff */
15:
16: #ifndef INDIRECT_THREADED
17: #ifndef DIRECT_THREADED
18: #define DIRECT_THREADED
19: /* direct threading saves 2 cycles per primitive on an R3000, 4 on an R4000 */
20: #endif
21: #endif
22:
1.3 anton 23: #ifdef ultrix
1.1 anton 24: #include <mips/cachectl.h>
1.3 anton 25: #else
26: /* works on Irix */
27: #include <sys/cachectl.h>
28: #endif
1.1 anton 29:
1.4 ! anton 30: #define FLUSH_ICACHE(addr,size) \
1.1 anton 31: cacheflush((char *)(addr), (int)(size), BCACHE)
32:
33: #include "32bit.h"
34:
35: #ifdef DIRECT_THREADED
36: /* some definitions for composing opcodes */
37: #define JUMP_MASK 0x03ffffff
38: #define J_PATTERN 0x08000000
39: #define JAL_PATTERN 0x0c000000
40: /* this provides the first 4 bits of a jump address, i.e. it must be <16 */
41: #define SEGMENT_NUM 1
42:
43:
44: /* PFA gives the parameter field address corresponding to a cfa */
45: # define PFA(cfa) (((Cell *)cfa)+2)
46: /* PFA1 is a special version for use just after a NEXT1 */
47: # define PFA1(cfa) PFA(cfa)
48: /* CODE_ADDRESS is the address of the code jumped to through the code field */
49: # define CODE_ADDRESS(cfa) ((Label)(((*(unsigned *)(cfa))^J_PATTERN^(SEGMENT_NUM<<26))<<2))
50: /* MAKE_CF creates an appropriate code field at the cfa; ca is the code address */
51: # define MAKE_CF(cfa,ca) ({long * _cfa = (long *)(cfa); \
52: _cfa[0] = J_PATTERN|((((long)(ca))&JUMP_MASK)>>2); /* J ca */ \
53: _cfa[1] = 0; /* nop */})
54: # ifdef undefined
55: /* the following version uses JAL to make PFA1 faster */
56: # define PFA1(label) ({register Cell *pfa asm("$31"); \
57: pfa; })
58: /* CODE_ADDRESS is the address of the code jumped to through the code field */
59: # define CODE_ADDRESS(cfa) ((Label)(((*(unsigned *)(cfa))^JAL_PATTERN^(SEGMENT_NUM<<26))<<2))
60: # define MAKE_CF(cfa,ca) ({long *_cfa = (long *)(cfa); \
61: long _ca = (long)(ca); \
62: _cfa[0] = JAL_PATTERN|(((((long)_ca)>>2))&JUMP_MASK); /* JAL ca+4 */ \
63: _cfa[1] = 0; /* *(long *)_ca; delay slot */})
64: # endif /* undefined */
65:
66: /* this is the point where the does code starts if label points to the
67: * jump dodoes */
68: # define DOES_CODE(cfa) ((Xt *)(((char *)CODE_ADDRESS(cfa))+8))
69:
70: /* this is a special version of DOES_CODE for use in dodoes */
71: # define DOES_CODE1(cfa) DOES_CODE(cfa)
72:
73: # define DOES_HANDLER_SIZE 8
74: # define MAKE_DOES_CF(cfa,does_code) \
75: ({long does_handlerp=((long)(does_code))-DOES_HANDLER_SIZE; \
76: long *_cfa = (long*)(cfa); \
77: _cfa[0] = J_PATTERN|((does_handlerp&JUMP_MASK)>>2); /* J ca */ \
78: _cfa[1] = 0; /* nop */})
79: /*
80: # define MAKE_DOES_CF(cfa, does_code) ({char *does_handlerp=((char *)does_code)-DOES_HANDLER_SIZE; \
81: MAKE_CF(cfa,does_handlerp); \
82: MAKE_DOES_HANDLER(does_handlerp) ;})
83: */
84: /* this stores a jump dodoes at addr */
85: # define MAKE_DOES_HANDLER(addr) MAKE_CF(addr,symbols[DODOES])
86:
87: #endif
88: #ifdef undefined
89: /* and here are some more efficient versions that can be tried later */
90:
91: /* the first version saves one cycle by doing something useful in the
92: delay slot. !! check that the instruction in the delay slot is legal
93: */
94:
95: #define MAKE_DOESJUMP(addr) ({long * _addr = (long *)addr; \
96: _addr[0] = J_PATTERN|(((((long)symbols[DODOES])>>2)+4)&JUMP_MASK), /* J dodoes+4 */ \
97: _addr[1] = *(long *)symbols[DODOES]; /* delay */})
98:
99: /* the following version uses JAL to make DOES_CODE1 faster */
100: /* !! does the declaration clear the register ? */
101: /* it's ok to use the same reg as in PFA1:
102: dodoes is the only potential problem and I have taken care of it */
103:
104: #define DOES_CODE1(cfa) ({register Code *_does_code asm("$31"); \
105: _does_code; })
106: #define MAKE_DOESJUMP(addr) ({long * _addr = (long *)addr; \
107: _addr[0] = JAL_PATTERN|(((((long)symbols[DODOES])>>2)+4)&JUMP_MASK), /* JAL dodoes+4 */ \
108: _addr[1] = *(long *)symbols[DODOES]; /* delay */})
109:
110: #endif
111:
112: #ifdef FORCE_REG
113: #define IPREG asm("$16")
114: #define SPREG asm("$17")
115: #define RPREG asm("$18")
116: #define LPREG asm("$19")
117: #define CFAREG asm("$20")
118: #define TOSREG asm("$21")
119: #endif /* FORCE_REG */
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