186 lines
4.8 KiB
C
186 lines
4.8 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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#ifndef _LINUX_MATH_EMU_H
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#define _LINUX_MATH_EMU_H
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#include <linux/sched.h>
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struct info {
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long ___math_ret;
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long ___orig_eip;
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long ___edi;
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long ___esi;
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long ___ebp;
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long ___sys_call_ret;
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long ___eax;
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long ___ebx;
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long ___ecx;
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long ___edx;
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long ___orig_eax;
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long ___fs;
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long ___es;
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long ___ds;
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long ___eip;
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long ___cs;
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long ___eflags;
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long ___esp;
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long ___ss;
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};
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#define EAX (info->___eax)
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#define EBX (info->___ebx)
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#define ECX (info->___ecx)
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#define EDX (info->___edx)
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#define ESI (info->___esi)
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#define EDI (info->___edi)
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#define EBP (info->___ebp)
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#define ESP (info->___esp)
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#define EIP (info->___eip)
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#define ORIG_EIP (info->___orig_eip)
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#define EFLAGS (info->___eflags)
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#define DS (*(unsigned short *) &(info->___ds))
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#define ES (*(unsigned short *) &(info->___es))
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#define FS (*(unsigned short *) &(info->___fs))
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#define CS (*(unsigned short *) &(info->___cs))
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#define SS (*(unsigned short *) &(info->___ss))
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void __math_abort(struct info *, unsigned int);
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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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#define I387 (current->tss.i387)
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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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char * ea(struct info * __info, unsigned short __code);
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/* convert.c */
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void short_to_temp(const short_real * __a, temp_real * __b);
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void long_to_temp(const long_real * __a, temp_real * __b);
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void temp_to_short(const temp_real * __a, short_real * __b);
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void temp_to_long(const temp_real * __a, long_real * __b);
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void real_to_int(const temp_real * __a, temp_int * __b);
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void int_to_real(const temp_int * __a, temp_real * __b);
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/* get_put.c */
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void get_short_real(temp_real *, struct info *, unsigned short);
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void get_long_real(temp_real *, struct info *, unsigned short);
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void get_temp_real(temp_real *, struct info *, unsigned short);
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void get_short_int(temp_real *, struct info *, unsigned short);
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void get_long_int(temp_real *, struct info *, unsigned short);
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void get_longlong_int(temp_real *, struct info *, unsigned short);
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void get_BCD(temp_real *, struct info *, unsigned short);
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void put_short_real(const temp_real *, struct info *, unsigned short);
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void put_long_real(const temp_real *, struct info *, unsigned short);
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void put_temp_real(const temp_real *, struct info *, unsigned short);
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void put_short_int(const temp_real *, struct info *, unsigned short);
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void put_long_int(const temp_real *, struct info *, unsigned short);
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void put_longlong_int(const temp_real *, struct info *, unsigned short);
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void put_BCD(const temp_real *, struct info *, unsigned short);
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/* add.c */
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void fadd(const temp_real *, const temp_real *, temp_real *);
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/* mul.c */
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void fmul(const temp_real *, const temp_real *, temp_real *);
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/* div.c */
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void fdiv(const temp_real *, const temp_real *, temp_real *);
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/* compare.c */
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void fcom(const temp_real *, const temp_real *);
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void fucom(const temp_real *, const temp_real *);
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void ftst(const temp_real *);
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#endif
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