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157 lines
4.5 KiB
C
157 lines
4.5 KiB
C
/*
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* linux/include/linux/math_emu.h
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*
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* (C) 1991 Linus Torvalds
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*
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* $Id: math_emu.h,v 1.2 1993/10/16 14:15:02 rgrimes Exp $
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*/
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#ifndef _LINUX_MATH_EMU_H
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#define _LINUX_MATH_EMU_H
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/*#define math_abort(x,y) \
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(((volatile void (*)(struct info *,unsigned int)) __math_abort)((x),(y)))*/
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/*
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* Gcc forces this stupid alignment problem: I want to use only two longs
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* for the temporary real 64-bit mantissa, but then gcc aligns out the
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* structure to 12 bytes which breaks things in math_emulate.c. Shit. I
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* want some kind of "no-alignt" pragma or something.
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*/
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typedef struct {
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long a,b;
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short exponent;
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} temp_real;
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typedef struct {
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short m0,m1,m2,m3;
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short exponent;
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} temp_real_unaligned;
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#define real_to_real(a,b) \
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((*(long long *) (b) = *(long long *) (a)),((b)->exponent = (a)->exponent))
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typedef struct {
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long a,b;
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} long_real;
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typedef long short_real;
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typedef struct {
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long a,b;
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short sign;
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} temp_int;
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struct swd {
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int ie:1;
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int de:1;
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int ze:1;
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int oe:1;
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int ue:1;
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int pe:1;
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int sf:1;
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int ir:1;
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int c0:1;
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int c1:1;
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int c2:1;
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int top:3;
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int c3:1;
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int b:1;
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};
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struct i387_struct {
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long cwd;
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long swd;
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long twd;
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long fip;
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long fcs;
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long foo;
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long fos;
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long st_space[20]; /* 8*10 bytes for each FP-reg = 80 bytes */
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};
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#define I387 (*(struct i387_struct *)&(((struct pcb *)curproc->p_addr)->pcb_savefpu))
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#define SWD (*(struct swd *) &I387.swd)
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#define ROUNDING ((I387.cwd >> 10) & 3)
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#define PRECISION ((I387.cwd >> 8) & 3)
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#define BITS24 0
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#define BITS53 2
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#define BITS64 3
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#define ROUND_NEAREST 0
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#define ROUND_DOWN 1
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#define ROUND_UP 2
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#define ROUND_0 3
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#define CONSTZ (temp_real_unaligned) {0x0000,0x0000,0x0000,0x0000,0x0000}
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#define CONST1 (temp_real_unaligned) {0x0000,0x0000,0x0000,0x8000,0x3FFF}
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#define CONSTPI (temp_real_unaligned) {0xC235,0x2168,0xDAA2,0xC90F,0x4000}
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#define CONSTLN2 (temp_real_unaligned) {0x79AC,0xD1CF,0x17F7,0xB172,0x3FFE}
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#define CONSTLG2 (temp_real_unaligned) {0xF799,0xFBCF,0x9A84,0x9A20,0x3FFD}
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#define CONSTL2E (temp_real_unaligned) {0xF0BC,0x5C17,0x3B29,0xB8AA,0x3FFF}
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#define CONSTL2T (temp_real_unaligned) {0x8AFE,0xCD1B,0x784B,0xD49A,0x4000}
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#define set_IE() (I387.swd |= 1)
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#define set_DE() (I387.swd |= 2)
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#define set_ZE() (I387.swd |= 4)
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#define set_OE() (I387.swd |= 8)
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#define set_UE() (I387.swd |= 16)
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#define set_PE() (I387.swd |= 32)
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#define set_C0() (I387.swd |= 0x0100)
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#define set_C1() (I387.swd |= 0x0200)
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#define set_C2() (I387.swd |= 0x0400)
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#define set_C3() (I387.swd |= 0x4000)
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/* ea.c */
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static char * ea(struct trapframe *, unsigned short);
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/* convert.c */
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static void frndint(const temp_real * __a, temp_real * __b);
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static void Fscale(const temp_real *, const temp_real *, temp_real *);
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static void short_to_temp(const short_real * __a, temp_real * __b);
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static void long_to_temp(const long_real * __a, temp_real * __b);
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static void temp_to_short(const temp_real * __a, short_real * __b);
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static void temp_to_long(const temp_real * __a, long_real * __b);
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static void real_to_int(const temp_real * __a, temp_int * __b);
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static void int_to_real(const temp_int * __a, temp_real * __b);
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/* get_put.c */
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static void get_short_real(temp_real *, struct trapframe *, unsigned short);
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static void get_long_real(temp_real *, struct trapframe *, unsigned short);
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static void get_temp_real(temp_real *, struct trapframe *, unsigned short);
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static void get_short_int(temp_real *, struct trapframe *, unsigned short);
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static void get_long_int(temp_real *, struct trapframe *, unsigned short);
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static void get_longlong_int(temp_real *, struct trapframe *, unsigned short);
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static void get_BCD(temp_real *, struct trapframe *, unsigned short);
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static void put_short_real(const temp_real *, struct trapframe *, unsigned short);
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static void put_long_real(const temp_real *, struct trapframe *, unsigned short);
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static void put_temp_real(const temp_real *, struct trapframe *, unsigned short);
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static void put_short_int(const temp_real *, struct trapframe *, unsigned short);
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static void put_long_int(const temp_real *, struct trapframe *, unsigned short);
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static void put_longlong_int(const temp_real *, struct trapframe *, unsigned short);
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static void put_BCD(const temp_real *, struct trapframe *, unsigned short);
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/* add.c */
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static void fadd(const temp_real *, const temp_real *, temp_real *);
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/* mul.c */
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static void fmul(const temp_real *, const temp_real *, temp_real *);
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/* div.c */
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static void fdiv(const temp_real *, const temp_real *, temp_real *);
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/* compare.c */
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static void fcom(const temp_real *, const temp_real *);
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static void fucom(const temp_real *, const temp_real *);
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static void ftst(const temp_real *);
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#endif
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