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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 | /*---------------------------------------------------------------------------+ | fpu_emu.h | | | | Copyright (C) 1992,1993,1994,1997 | | W. Metzenthen, 22 Parker St, Ormond, Vic 3163, | | Australia. E-mail billm@suburbia.net | | | +---------------------------------------------------------------------------*/ #ifndef _FPU_EMU_H_ #define _FPU_EMU_H_ /* * Define PECULIAR_486 to get a closer approximation to 80486 behaviour, * rather than behaviour which appears to be cleaner. * This is a matter of opinion: for all I know, the 80486 may simply * be complying with the IEEE spec. Maybe one day I'll get to see the * spec... */ #define PECULIAR_486 #ifdef __ASSEMBLY__ #include "fpu_asm.h" #define Const(x) $##x #else #define Const(x) x #endif #define EXP_BIAS Const(0) #define EXP_OVER Const(0x4000) /* smallest invalid large exponent */ #define EXP_UNDER Const(-0x3fff) /* largest invalid small exponent */ #define EXP_WAY_UNDER Const(-0x6000) /* Below the smallest denormal, but still a 16 bit nr. */ #define EXP_Infinity EXP_OVER #define EXP_NaN EXP_OVER #define EXTENDED_Ebias Const(0x3fff) #define EXTENDED_Emin (-0x3ffe) /* smallest valid exponent */ #define SIGN_POS Const(0) #define SIGN_NEG Const(0x80) #define SIGN_Positive Const(0) #define SIGN_Negative Const(0x8000) /* Keep the order TAG_Valid, TAG_Zero, TW_Denormal */ /* The following fold to 2 (Special) in the Tag Word */ #define TW_Denormal Const(4) /* De-normal */ #define TW_Infinity Const(5) /* + or - infinity */ #define TW_NaN Const(6) /* Not a Number */ #define TW_Unsupported Const(7) /* Not supported by an 80486 */ #define TAG_Valid Const(0) /* valid */ #define TAG_Zero Const(1) /* zero */ #define TAG_Special Const(2) /* De-normal, + or - infinity, or Not a Number */ #define TAG_Empty Const(3) /* empty */ #define TAG_Error Const(0x80) /* probably need to abort */ #define LOADED_DATA Const(10101) /* Special st() number to identify loaded data (not on stack). */ /* A few flags (must be >= 0x10). */ #define REV 0x10 #define DEST_RM 0x20 #define LOADED 0x40 #define FPU_Exception Const(0x80000000) /* Added to tag returns. */ #ifndef __ASSEMBLY__ #include "fpu_system.h" #include <asm/sigcontext.h> /* for struct _fpstate */ #include <asm/math_emu.h> #include <linux/linkage.h> /* #define RE_ENTRANT_CHECKING */ #ifdef RE_ENTRANT_CHECKING extern u_char emulating; # define RE_ENTRANT_CHECK_OFF emulating = 0 # define RE_ENTRANT_CHECK_ON emulating = 1 #else # define RE_ENTRANT_CHECK_OFF # define RE_ENTRANT_CHECK_ON #endif /* RE_ENTRANT_CHECKING */ #define FWAIT_OPCODE 0x9b #define OP_SIZE_PREFIX 0x66 #define ADDR_SIZE_PREFIX 0x67 #define PREFIX_CS 0x2e #define PREFIX_DS 0x3e #define PREFIX_ES 0x26 #define PREFIX_SS 0x36 #define PREFIX_FS 0x64 #define PREFIX_GS 0x65 #define PREFIX_REPE 0xf3 #define PREFIX_REPNE 0xf2 #define PREFIX_LOCK 0xf0 #define PREFIX_CS_ 1 #define PREFIX_DS_ 2 #define PREFIX_ES_ 3 #define PREFIX_FS_ 4 #define PREFIX_GS_ 5 #define PREFIX_SS_ 6 #define PREFIX_DEFAULT 7 struct address { unsigned int offset; unsigned int selector:16; unsigned int opcode:11; unsigned int empty:5; }; struct fpu__reg { unsigned sigl; unsigned sigh; short exp; }; typedef void (*FUNC) (void); typedef struct fpu__reg FPU_REG; typedef void (*FUNC_ST0) (FPU_REG *st0_ptr, u_char st0_tag); typedef struct { u_char address_size, operand_size, segment; } overrides; /* This structure is 32 bits: */ typedef struct { overrides override; u_char default_mode; } fpu_addr_modes; /* PROTECTED has a restricted meaning in the emulator; it is used to signal that the emulator needs to do special things to ensure that protection is respected in a segmented model. */ #define PROTECTED 4 #define SIXTEEN 1 /* We rely upon this being 1 (true) */ #define VM86 SIXTEEN #define PM16 (SIXTEEN | PROTECTED) #define SEG32 PROTECTED extern u_char const data_sizes_16[32]; #define register_base ((u_char *) registers ) #define fpu_register(x) ( * ((FPU_REG *)( register_base + 10 * (x & 7) )) ) #define st(x) ( * ((FPU_REG *)( register_base + 10 * ((top+x) & 7) )) ) #define STACK_OVERFLOW (FPU_stackoverflow(&st_new_ptr)) #define NOT_EMPTY(i) (!FPU_empty_i(i)) #define NOT_EMPTY_ST0 (st0_tag ^ TAG_Empty) #define poppop() { FPU_pop(); FPU_pop(); } /* push() does not affect the tags */ #define push() { top--; } #define signbyte(a) (((u_char *)(a))[9]) #define getsign(a) (signbyte(a) & 0x80) #define setsign(a,b) { if (b) signbyte(a) |= 0x80; else signbyte(a) &= 0x7f; } #define copysign(a,b) { if (getsign(a)) signbyte(b) |= 0x80; \ else signbyte(b) &= 0x7f; } #define changesign(a) { signbyte(a) ^= 0x80; } #define setpositive(a) { signbyte(a) &= 0x7f; } #define setnegative(a) { signbyte(a) |= 0x80; } #define signpositive(a) ( (signbyte(a) & 0x80) == 0 ) #define signnegative(a) (signbyte(a) & 0x80) static inline void reg_copy(FPU_REG const *x, FPU_REG *y) { *(short *)&(y->exp) = *(const short *)&(x->exp); *(long long *)&(y->sigl) = *(const long long *)&(x->sigl); } #define exponent(x) (((*(short *)&((x)->exp)) & 0x7fff) - EXTENDED_Ebias) #define setexponentpos(x,y) { (*(short *)&((x)->exp)) = \ ((y) + EXTENDED_Ebias) & 0x7fff; } #define exponent16(x) (*(short *)&((x)->exp)) #define setexponent16(x,y) { (*(short *)&((x)->exp)) = (y); } #define addexponent(x,y) { (*(short *)&((x)->exp)) += (y); } #define stdexp(x) { (*(short *)&((x)->exp)) += EXTENDED_Ebias; } #define isdenormal(ptr) (exponent(ptr) == EXP_BIAS+EXP_UNDER) #define significand(x) ( ((unsigned long long *)&((x)->sigl))[0] ) /*----- Prototypes for functions written in assembler -----*/ /* extern void reg_move(FPU_REG *a, FPU_REG *b); */ asmlinkage int FPU_normalize(FPU_REG *x); asmlinkage int FPU_normalize_nuo(FPU_REG *x); asmlinkage int FPU_u_sub(FPU_REG const *arg1, FPU_REG const *arg2, FPU_REG * answ, unsigned int control_w, u_char sign, int expa, int expb); asmlinkage int FPU_u_mul(FPU_REG const *arg1, FPU_REG const *arg2, FPU_REG * answ, unsigned int control_w, u_char sign, int expon); asmlinkage int FPU_u_div(FPU_REG const *arg1, FPU_REG const *arg2, FPU_REG * answ, unsigned int control_w, u_char sign); asmlinkage int FPU_u_add(FPU_REG const *arg1, FPU_REG const *arg2, FPU_REG * answ, unsigned int control_w, u_char sign, int expa, int expb); asmlinkage int wm_sqrt(FPU_REG *n, int dummy1, int dummy2, unsigned int control_w, u_char sign); asmlinkage unsigned FPU_shrx(void *l, unsigned x); asmlinkage unsigned FPU_shrxs(void *v, unsigned x); asmlinkage unsigned long FPU_div_small(unsigned long long *x, unsigned long y); asmlinkage int FPU_round(FPU_REG *arg, unsigned int extent, int dummy, unsigned int control_w, u_char sign); #ifndef MAKING_PROTO #include "fpu_proto.h" #endif #endif /* __ASSEMBLY__ */ #endif /* _FPU_EMU_H_ */ |