[deb_xorg-server.git] / hw / xfree86 / x86emu / x86emu / fpu_regs.h

/****************************************************************************
*
*						Realmode X86 Emulator Library
*
*            	Copyright (C) 1996-1999 SciTech Software, Inc.
* 				     Copyright (C) David Mosberger-Tang
* 					   Copyright (C) 1999 Egbert Eich
*
*  ========================================================================
*
*  Permission to use, copy, modify, distribute, and sell this software and
*  its documentation for any purpose is hereby granted without fee,
*  provided that the above copyright notice appear in all copies and that
*  both that copyright notice and this permission notice appear in
*  supporting documentation, and that the name of the authors not be used
*  in advertising or publicity pertaining to distribution of the software
*  without specific, written prior permission.  The authors makes no
*  representations about the suitability of this software for any purpose.
*  It is provided "as is" without express or implied warranty.
*
*  THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
*  INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
*  EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
*  CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
*  USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
*  OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
*  PERFORMANCE OF THIS SOFTWARE.
*
*  ========================================================================
*
* Language:		ANSI C
* Environment:	Any
* Developer:    Kendall Bennett
*
* Description:  Header file for FPU register definitions.
*
****************************************************************************/

#ifndef __X86EMU_FPU_REGS_H
#define __X86EMU_FPU_REGS_H

#ifdef X86_FPU_SUPPORT

#ifdef PACK
#pragma PACK
#endif

/* Basic 8087 register can hold any of the following values: */

union x86_fpu_reg_u {
    s8 tenbytes[10];
    double dval;
    float fval;
    s16 sval;
    s32 lval;
};

struct x86_fpu_reg {
    union x86_fpu_reg_u reg;
    char tag;
};

/*
 * Since we are not going to worry about the problems of aliasing
 * registers, every time a register is modified, its result type is
 * set in the tag fields for that register.  If some operation
 * attempts to access the type in a way inconsistent with its current
 * storage format, then we flag the operation.  If common, we'll
 * attempt the conversion.
 */

#define  X86_FPU_VALID          0x80
#define  X86_FPU_REGTYP(r)      ((r) & 0x7F)

#define  X86_FPU_WORD           0x0
#define  X86_FPU_SHORT          0x1
#define  X86_FPU_LONG           0x2
#define  X86_FPU_FLOAT          0x3
#define  X86_FPU_DOUBLE         0x4
#define  X86_FPU_LDBL           0x5
#define  X86_FPU_BSD            0x6

#define  X86_FPU_STKTOP  0

struct x86_fpu_registers {
    struct x86_fpu_reg x86_fpu_stack[8];
    int x86_fpu_flags;
    int x86_fpu_config;         /* rounding modes, etc. */
    short x86_fpu_tos, x86_fpu_bos;
};

#ifdef END_PACK
#pragma END_PACK
#endif

/*
 * There are two versions of the following macro.
 *
 * One version is for opcode D9, for which there are more than 32
 * instructions encoded in the second byte of the opcode.
 *
 * The other version, deals with all the other 7 i87 opcodes, for
 * which there are only 32 strings needed to describe the
 * instructions.
 */

#endif                          /* X86_FPU_SUPPORT */

#ifdef DEBUG
#define DECODE_PRINTINSTR32(t,mod,rh,rl)     	\
	DECODE_PRINTF(t[(mod<<3)+(rh)]);
#define DECODE_PRINTINSTR256(t,mod,rh,rl)    	\
	DECODE_PRINTF(t[(mod<<6)+(rh<<3)+(rl)]);
#else
#define DECODE_PRINTINSTR32(t,mod,rh,rl)
#define DECODE_PRINTINSTR256(t,mod,rh,rl)
#endif

#endif                          /* __X86EMU_FPU_REGS_H */
Commit	Line	Data
a09e091a JB	1	/****************************************************************************
	2	*
	3	* Realmode X86 Emulator Library
	4	*
	5	* Copyright (C) 1996-1999 SciTech Software, Inc.
	6	* Copyright (C) David Mosberger-Tang
	7	* Copyright (C) 1999 Egbert Eich
	8	*
	9	* ========================================================================
	10	*
	11	* Permission to use, copy, modify, distribute, and sell this software and
	12	* its documentation for any purpose is hereby granted without fee,
	13	* provided that the above copyright notice appear in all copies and that
	14	* both that copyright notice and this permission notice appear in
	15	* supporting documentation, and that the name of the authors not be used
	16	* in advertising or publicity pertaining to distribution of the software
	17	* without specific, written prior permission. The authors makes no
	18	* representations about the suitability of this software for any purpose.
	19	* It is provided "as is" without express or implied warranty.
	20	*
	21	* THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
	22	* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
	23	* EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
	24	* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
	25	* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
	26	* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
	27	* PERFORMANCE OF THIS SOFTWARE.
	28	*
	29	* ========================================================================
	30	*
	31	* Language: ANSI C
	32	* Environment: Any
	33	* Developer: Kendall Bennett
	34	*
	35	* Description: Header file for FPU register definitions.
	36	*
	37	****************************************************************************/
	38
	39	#ifndef __X86EMU_FPU_REGS_H
	40	#define __X86EMU_FPU_REGS_H
	41
	42	#ifdef X86_FPU_SUPPORT
	43
	44	#ifdef PACK
	45	#pragma PACK
	46	#endif
	47
	48	/* Basic 8087 register can hold any of the following values: */
	49
	50	union x86_fpu_reg_u {
	51	s8 tenbytes[10];
	52	double dval;
	53	float fval;
	54	s16 sval;
	55	s32 lval;
	56	};
	57
	58	struct x86_fpu_reg {
	59	union x86_fpu_reg_u reg;
	60	char tag;
	61	};
	62
	63	/*
	64	* Since we are not going to worry about the problems of aliasing
65	* registers, every time a register is modified, its result type is
66	* set in the tag fields for that register. If some operation
67	* attempts to access the type in a way inconsistent with its current
68	* storage format, then we flag the operation. If common, we'll
69	* attempt the conversion.
70	*/
71
72	#define X86_FPU_VALID 0x80
73	#define X86_FPU_REGTYP(r) ((r) & 0x7F)
74
75	#define X86_FPU_WORD 0x0
76	#define X86_FPU_SHORT 0x1
77	#define X86_FPU_LONG 0x2
78	#define X86_FPU_FLOAT 0x3
79	#define X86_FPU_DOUBLE 0x4
80	#define X86_FPU_LDBL 0x5
81	#define X86_FPU_BSD 0x6
82
83	#define X86_FPU_STKTOP 0
84
85	struct x86_fpu_registers {
86	struct x86_fpu_reg x86_fpu_stack[8];
87	int x86_fpu_flags;
88	int x86_fpu_config; /* rounding modes, etc. */
89	short x86_fpu_tos, x86_fpu_bos;
90	};
91
92	#ifdef END_PACK
93	#pragma END_PACK
94	#endif
95
96	/*
97	* There are two versions of the following macro.
98	*
99	* One version is for opcode D9, for which there are more than 32
100	* instructions encoded in the second byte of the opcode.
101	*
102	* The other version, deals with all the other 7 i87 opcodes, for
103	* which there are only 32 strings needed to describe the
104	* instructions.
105	*/
106
107	#endif /* X86_FPU_SUPPORT */
108
109	#ifdef DEBUG
110	#define DECODE_PRINTINSTR32(t,mod,rh,rl) \
111	DECODE_PRINTF(t[(mod<<3)+(rh)]);
112	#define DECODE_PRINTINSTR256(t,mod,rh,rl) \
113	DECODE_PRINTF(t[(mod<<6)+(rh<<3)+(rl)]);
114	#else
115	#define DECODE_PRINTINSTR32(t,mod,rh,rl)
116	#define DECODE_PRINTINSTR256(t,mod,rh,rl)
117	#endif
118
119	#endif /* __X86EMU_FPU_REGS_H */