167 lines
5.4 KiB
C
167 lines
5.4 KiB
C
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/*---------------------------------------------------------------------------+
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| fpu_emu.h |
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| Copyright (C) 1992,1993,1994 |
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| W. Metzenthen, 22 Parker St, Ormond, Vic 3163, |
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| Australia. E-mail billm@vaxc.cc.monash.edu.au |
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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 DENORM_OPERAND to make the emulator detect denormals
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* and use the denormal flag of the status word. Note: this only
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* affects the flag and corresponding interrupt, the emulator
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* will always generate denormals and operate upon them as required.
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*/
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#define DENORM_OPERAND
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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 __ASSEMBLER__
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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_Infinity EXP_OVER
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#define EXP_NaN EXP_OVER
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#define SIGN_POS Const(0)
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#define SIGN_NEG Const(1)
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/* Keep the order TW_Valid, TW_Zero, TW_Denormal */
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#define TW_Valid Const(0) /* valid */
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#define TW_Zero Const(1) /* zero */
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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_Empty Const(7) /* empty */
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#ifndef __ASSEMBLER__
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#include <linux/math_emu.h>
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#include <linux/linkage.h>
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#ifdef PARANOID
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extern 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 PARANOID
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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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/* These are to defeat the default action, giving the instruction
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no net effect: */
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#define NO_NET_DATA_EFFECT \
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{ FPU_data_address = (void *)data_operand_offset; \
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FPU_data_selector = operand_selector; }
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#define NO_NET_INSTR_EFFECT \
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{ FPU_entry_eip = ip_offset; \
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FPU_entry_op_cs = cs_selector; }
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typedef void (*FUNC)(void);
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typedef struct fpu_reg FPU_REG;
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typedef struct { unsigned char address_size, segment; } overrides;
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#define st(x) ( regs[((top+x) &7 )] )
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#define STACK_OVERFLOW (st_new_ptr = &st(-1), st_new_ptr->tag != TW_Empty)
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#define NOT_EMPTY(i) (st(i).tag != TW_Empty)
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#define NOT_EMPTY_0 (FPU_st0_tag ^ TW_Empty)
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extern unsigned char FPU_rm;
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extern char FPU_st0_tag;
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extern FPU_REG *FPU_st0_ptr;
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/* ###### These need to be shifted to somewhere safe. */
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/* extern void *FPU_data_address; has been shifted */
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extern unsigned short FPU_data_selector;
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extern unsigned long FPU_entry_op_cs;
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extern FPU_REG FPU_loaded_data;
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#define pop() { FPU_st0_ptr->tag = TW_Empty; top++; }
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/* push() does not affect the tags */
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#define push() { top--; FPU_st0_ptr = st_new_ptr; }
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#define reg_move(x, y) { \
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*(short *)&((y)->sign) = *(short *)&((x)->sign); \
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*(long *)&((y)->exp) = *(long *)&((x)->exp); \
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*(long long *)&((y)->sigl) = *(long long *)&((x)->sigl); }
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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 void mul64(unsigned long long const *a, unsigned long long const *b,
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unsigned long long *result);
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asmlinkage void poly_div2(unsigned long long *x);
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asmlinkage void poly_div4(unsigned long long *x);
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asmlinkage void poly_div16(unsigned long long *x);
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asmlinkage void polynomial(unsigned accum[], unsigned const x[],
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unsigned short const terms[][4], int const n);
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asmlinkage void normalize(FPU_REG *x);
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asmlinkage void normalize_nuo(FPU_REG *x);
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asmlinkage int reg_div(FPU_REG const *arg1, FPU_REG const *arg2,
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FPU_REG *answ, unsigned int control_w);
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asmlinkage int reg_u_sub(FPU_REG const *arg1, FPU_REG const *arg2,
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FPU_REG *answ, unsigned int control_w);
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asmlinkage int reg_u_mul(FPU_REG const *arg1, FPU_REG const *arg2,
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FPU_REG *answ, unsigned int control_w);
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asmlinkage int reg_u_div(FPU_REG const *arg1, FPU_REG const *arg2,
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FPU_REG *answ, unsigned int control_w);
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asmlinkage int reg_u_add(FPU_REG const *arg1, FPU_REG const *arg2,
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FPU_REG *answ, unsigned int control_w);
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asmlinkage int wm_sqrt(FPU_REG *n, unsigned int control_w);
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asmlinkage unsigned shrx(void *l, unsigned x);
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asmlinkage unsigned shrxs(void *v, unsigned x);
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asmlinkage unsigned long div_small(unsigned long long *x, unsigned long y);
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asmlinkage void round_reg(FPU_REG *arg, unsigned int extent,
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unsigned int control_w);
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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 __ASSEMBLER__
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#endif _FPU_EMU_H_
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