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218 lines
7.2 KiB
218 lines
7.2 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/*---------------------------------------------------------------------------+ |
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| fpu_emu.h | |
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| | |
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| Copyright (C) 1992,1993,1994,1997 | |
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| W. Metzenthen, 22 Parker St, Ormond, Vic 3163, | |
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| Australia. E-mail [email protected] | |
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| | |
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+---------------------------------------------------------------------------*/ |
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#ifndef _FPU_EMU_H_ |
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#define _FPU_EMU_H_ |
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/* |
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* Define PECULIAR_486 to get a closer approximation to 80486 behaviour, |
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* rather than behaviour which appears to be cleaner. |
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* This is a matter of opinion: for all I know, the 80486 may simply |
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* be complying with the IEEE spec. Maybe one day I'll get to see the |
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* spec... |
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*/ |
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#define PECULIAR_486 |
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#ifdef __ASSEMBLY__ |
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#include "fpu_asm.h" |
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#define Const(x) $##x |
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#else |
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#define Const(x) x |
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#endif |
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#define EXP_BIAS Const(0) |
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#define EXP_OVER Const(0x4000) /* smallest invalid large exponent */ |
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#define EXP_UNDER Const(-0x3fff) /* largest invalid small exponent */ |
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#define EXP_WAY_UNDER Const(-0x6000) /* Below the smallest denormal, but |
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still a 16 bit nr. */ |
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#define EXP_Infinity EXP_OVER |
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#define EXP_NaN EXP_OVER |
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#define EXTENDED_Ebias Const(0x3fff) |
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#define EXTENDED_Emin (-0x3ffe) /* smallest valid exponent */ |
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#define SIGN_POS Const(0) |
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#define SIGN_NEG Const(0x80) |
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#define SIGN_Positive Const(0) |
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#define SIGN_Negative Const(0x8000) |
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/* Keep the order TAG_Valid, TAG_Zero, TW_Denormal */ |
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/* The following fold to 2 (Special) in the Tag Word */ |
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#define TW_Denormal Const(4) /* De-normal */ |
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#define TW_Infinity Const(5) /* + or - infinity */ |
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#define TW_NaN Const(6) /* Not a Number */ |
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#define TW_Unsupported Const(7) /* Not supported by an 80486 */ |
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#define TAG_Valid Const(0) /* valid */ |
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#define TAG_Zero Const(1) /* zero */ |
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#define TAG_Special Const(2) /* De-normal, + or - infinity, |
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or Not a Number */ |
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#define TAG_Empty Const(3) /* empty */ |
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#define TAG_Error Const(0x80) /* probably need to abort */ |
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#define LOADED_DATA Const(10101) /* Special st() number to identify |
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loaded data (not on stack). */ |
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/* A few flags (must be >= 0x10). */ |
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#define REV 0x10 |
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#define DEST_RM 0x20 |
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#define LOADED 0x40 |
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#define FPU_Exception Const(0x80000000) /* Added to tag returns. */ |
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#ifndef __ASSEMBLY__ |
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#include "fpu_system.h" |
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#include <uapi/asm/sigcontext.h> /* for struct _fpstate */ |
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#include <asm/math_emu.h> |
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#include <linux/linkage.h> |
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/* |
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#define RE_ENTRANT_CHECKING |
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*/ |
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#ifdef RE_ENTRANT_CHECKING |
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extern u_char emulating; |
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# define RE_ENTRANT_CHECK_OFF emulating = 0 |
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# define RE_ENTRANT_CHECK_ON emulating = 1 |
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#else |
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# define RE_ENTRANT_CHECK_OFF |
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# define RE_ENTRANT_CHECK_ON |
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#endif /* RE_ENTRANT_CHECKING */ |
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#define FWAIT_OPCODE 0x9b |
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#define OP_SIZE_PREFIX 0x66 |
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#define ADDR_SIZE_PREFIX 0x67 |
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#define PREFIX_CS 0x2e |
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#define PREFIX_DS 0x3e |
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#define PREFIX_ES 0x26 |
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#define PREFIX_SS 0x36 |
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#define PREFIX_FS 0x64 |
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#define PREFIX_GS 0x65 |
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#define PREFIX_REPE 0xf3 |
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#define PREFIX_REPNE 0xf2 |
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#define PREFIX_LOCK 0xf0 |
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#define PREFIX_CS_ 1 |
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#define PREFIX_DS_ 2 |
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#define PREFIX_ES_ 3 |
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#define PREFIX_FS_ 4 |
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#define PREFIX_GS_ 5 |
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#define PREFIX_SS_ 6 |
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#define PREFIX_DEFAULT 7 |
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struct address { |
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unsigned int offset; |
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unsigned int selector:16; |
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unsigned int opcode:11; |
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unsigned int empty:5; |
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}; |
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struct fpu__reg { |
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unsigned sigl; |
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unsigned sigh; |
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short exp; |
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}; |
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typedef void (*FUNC) (void); |
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typedef struct fpu__reg FPU_REG; |
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typedef void (*FUNC_ST0) (FPU_REG *st0_ptr, u_char st0_tag); |
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typedef struct { |
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u_char address_size, operand_size, segment; |
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} overrides; |
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/* This structure is 32 bits: */ |
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typedef struct { |
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overrides override; |
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u_char default_mode; |
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} fpu_addr_modes; |
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/* PROTECTED has a restricted meaning in the emulator; it is used |
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to signal that the emulator needs to do special things to ensure |
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that protection is respected in a segmented model. */ |
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#define PROTECTED 4 |
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#define SIXTEEN 1 /* We rely upon this being 1 (true) */ |
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#define VM86 SIXTEEN |
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#define PM16 (SIXTEEN | PROTECTED) |
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#define SEG32 PROTECTED |
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extern u_char const data_sizes_16[32]; |
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#define register_base ((u_char *) registers ) |
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#define fpu_register(x) ( * ((FPU_REG *)( register_base + 10 * (x & 7) )) ) |
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#define st(x) ( * ((FPU_REG *)( register_base + 10 * ((top+x) & 7) )) ) |
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#define STACK_OVERFLOW (FPU_stackoverflow(&st_new_ptr)) |
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#define NOT_EMPTY(i) (!FPU_empty_i(i)) |
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#define NOT_EMPTY_ST0 (st0_tag ^ TAG_Empty) |
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#define poppop() { FPU_pop(); FPU_pop(); } |
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/* push() does not affect the tags */ |
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#define push() { top--; } |
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#define signbyte(a) (((u_char *)(a))[9]) |
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#define getsign(a) (signbyte(a) & 0x80) |
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#define setsign(a,b) { if ((b) != 0) signbyte(a) |= 0x80; else signbyte(a) &= 0x7f; } |
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#define copysign(a,b) { if (getsign(a)) signbyte(b) |= 0x80; \ |
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else signbyte(b) &= 0x7f; } |
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#define changesign(a) { signbyte(a) ^= 0x80; } |
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#define setpositive(a) { signbyte(a) &= 0x7f; } |
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#define setnegative(a) { signbyte(a) |= 0x80; } |
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#define signpositive(a) ( (signbyte(a) & 0x80) == 0 ) |
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#define signnegative(a) (signbyte(a) & 0x80) |
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static inline void reg_copy(FPU_REG const *x, FPU_REG *y) |
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{ |
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*(short *)&(y->exp) = *(const short *)&(x->exp); |
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*(long long *)&(y->sigl) = *(const long long *)&(x->sigl); |
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} |
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#define exponent(x) (((*(short *)&((x)->exp)) & 0x7fff) - EXTENDED_Ebias) |
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#define setexponentpos(x,y) { (*(short *)&((x)->exp)) = \ |
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((y) + EXTENDED_Ebias) & 0x7fff; } |
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#define exponent16(x) (*(short *)&((x)->exp)) |
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#define setexponent16(x,y) { (*(short *)&((x)->exp)) = (u16)(y); } |
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#define addexponent(x,y) { (*(short *)&((x)->exp)) += (y); } |
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#define stdexp(x) { (*(short *)&((x)->exp)) += EXTENDED_Ebias; } |
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#define isdenormal(ptr) (exponent(ptr) == EXP_BIAS+EXP_UNDER) |
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#define significand(x) ( ((unsigned long long *)&((x)->sigl))[0] ) |
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/*----- Prototypes for functions written in assembler -----*/ |
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/* extern void reg_move(FPU_REG *a, FPU_REG *b); */ |
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asmlinkage int FPU_normalize(FPU_REG *x); |
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asmlinkage int FPU_normalize_nuo(FPU_REG *x); |
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asmlinkage int FPU_u_sub(FPU_REG const *arg1, FPU_REG const *arg2, |
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FPU_REG * answ, unsigned int control_w, u_char sign, |
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int expa, int expb); |
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asmlinkage int FPU_u_mul(FPU_REG const *arg1, FPU_REG const *arg2, |
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FPU_REG * answ, unsigned int control_w, u_char sign, |
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int expon); |
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asmlinkage int FPU_u_div(FPU_REG const *arg1, FPU_REG const *arg2, |
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FPU_REG * answ, unsigned int control_w, u_char sign); |
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asmlinkage int FPU_u_add(FPU_REG const *arg1, FPU_REG const *arg2, |
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FPU_REG * answ, unsigned int control_w, u_char sign, |
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int expa, int expb); |
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asmlinkage int wm_sqrt(FPU_REG *n, int dummy1, int dummy2, |
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unsigned int control_w, u_char sign); |
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asmlinkage unsigned FPU_shrx(void *l, unsigned x); |
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asmlinkage unsigned FPU_shrxs(void *v, unsigned x); |
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asmlinkage unsigned long FPU_div_small(unsigned long long *x, unsigned long y); |
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asmlinkage int FPU_round(FPU_REG *arg, unsigned int extent, int dummy, |
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unsigned int control_w, u_char sign); |
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#ifndef MAKING_PROTO |
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#include "fpu_proto.h" |
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#endif |
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#endif /* __ASSEMBLY__ */ |
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#endif /* _FPU_EMU_H_ */
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