xref: /src/common/include/x86emu/x86emu_regs.h

/*	$NetBSD: x86emu_regs.h,v 1.1.74.2 2020/04/21 19:37:40 martin Exp $	*/

/****************************************************************************
*
*  Realmode X86 Emulator Library
*
*  Copyright (C) 1996-1999 SciTech Software, Inc.
*  Copyright (C) David Mosberger-Tang
*  Copyright (C) 1999 Egbert Eich
*  Copyright (C) 2007 Joerg Sonnenberger
*
*  ========================================================================
*
*  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.
*
****************************************************************************/

#ifndef __X86EMU_REGS_H
#define __X86EMU_REGS_H

/*---------------------- Macros and type definitions ----------------------*/

/* 8 bit registers */
#define R_AH  register_a.I8_reg.h_reg
#define R_AL  register_a.I8_reg.l_reg
#define R_BH  register_b.I8_reg.h_reg
#define R_BL  register_b.I8_reg.l_reg
#define R_CH  register_c.I8_reg.h_reg
#define R_CL  register_c.I8_reg.l_reg
#define R_DH  register_d.I8_reg.h_reg
#define R_DL  register_d.I8_reg.l_reg

/* 16 bit registers */
#define R_AX  register_a.I16_reg.x_reg
#define R_BX  register_b.I16_reg.x_reg
#define R_CX  register_c.I16_reg.x_reg
#define R_DX  register_d.I16_reg.x_reg

/* 32 bit extended registers */
#define R_EAX  register_a.I32_reg.e_reg
#define R_EBX  register_b.I32_reg.e_reg
#define R_ECX  register_c.I32_reg.e_reg
#define R_EDX  register_d.I32_reg.e_reg

/* special registers */
#define R_SP  register_sp.I16_reg.x_reg
#define R_BP  register_bp.I16_reg.x_reg
#define R_SI  register_si.I16_reg.x_reg
#define R_DI  register_di.I16_reg.x_reg
#define R_IP  register_ip.I16_reg.x_reg
#define R_FLG register_flags

/* special registers */
#define R_ESP  register_sp.I32_reg.e_reg
#define R_EBP  register_bp.I32_reg.e_reg
#define R_ESI  register_si.I32_reg.e_reg
#define R_EDI  register_di.I32_reg.e_reg
#define R_EIP  register_ip.I32_reg.e_reg
#define R_EFLG register_flags

/* segment registers */
#define R_CS  register_cs
#define R_DS  register_ds
#define R_SS  register_ss
#define R_ES  register_es
#define R_FS  register_fs
#define R_GS  register_gs

/* flag conditions   */
#define FB_CF 0x0001            /* CARRY flag  */
#define FB_PF 0x0004            /* PARITY flag */
#define FB_AF 0x0010            /* AUX  flag   */
#define FB_ZF 0x0040            /* ZERO flag   */
#define FB_SF 0x0080            /* SIGN flag   */
#define FB_TF 0x0100            /* TRAP flag   */
#define FB_IF 0x0200            /* INTERRUPT ENABLE flag */
#define FB_DF 0x0400            /* DIR flag    */
#define FB_OF 0x0800            /* OVERFLOW flag */

/* 80286 and above always have bit#1 set */
#define F_ALWAYS_ON  (0x0002)   /* flag bits always on */

/*
 * Define a mask for only those flag bits we will ever pass back
 * (via PUSHF)
 */
#define F_MSK (FB_CF|FB_PF|FB_AF|FB_ZF|FB_SF|FB_TF|FB_IF|FB_DF|FB_OF)

/* following bits masked in to a 16bit quantity */

#define F_CF 0x0001             /* CARRY flag  */
#define F_PF 0x0004             /* PARITY flag */
#define F_AF 0x0010             /* AUX  flag   */
#define F_ZF 0x0040             /* ZERO flag   */
#define F_SF 0x0080             /* SIGN flag   */
#define F_TF 0x0100             /* TRAP flag   */
#define F_IF 0x0200             /* INTERRUPT ENABLE flag */
#define F_DF 0x0400             /* DIR flag    */
#define F_OF 0x0800             /* OVERFLOW flag */

#define SET_FLAG(flag)        	(emu->x86.R_FLG |= (flag))
#define CLEAR_FLAG(flag)      	(emu->x86.R_FLG &= ~(flag))
#define ACCESS_FLAG(flag)     	(emu->x86.R_FLG & (flag))
#define CLEARALL_FLAG(m)    	(emu->x86.R_FLG = 0)

#define CONDITIONAL_SET_FLAG(COND,FLAG) \
  if (COND) SET_FLAG(FLAG); else CLEAR_FLAG(FLAG)

#define F_PF_CALC 0x010000      /* PARITY flag has been calced    */
#define F_ZF_CALC 0x020000      /* ZERO flag has been calced      */
#define F_SF_CALC 0x040000      /* SIGN flag has been calced      */

#define F_ALL_CALC      0xff0000        /* All have been calced   */

/*
 * Emulator machine state.
 * Segment usage control.
 */
#define SYSMODE_SEG_DS_SS       0x00000001
#define SYSMODE_SEGOVR_CS       0x00000002
#define SYSMODE_SEGOVR_DS       0x00000004
#define SYSMODE_SEGOVR_ES       0x00000008
#define SYSMODE_SEGOVR_FS       0x00000010
#define SYSMODE_SEGOVR_GS       0x00000020
#define SYSMODE_SEGOVR_SS       0x00000040
#define SYSMODE_PREFIX_REPE     0x00000080
#define SYSMODE_PREFIX_REPNE    0x00000100
#define SYSMODE_PREFIX_DATA     0x00000200
#define SYSMODE_PREFIX_ADDR     0x00000400
#define SYSMODE_INTR_PENDING    0x10000000
#define SYSMODE_EXTRN_INTR      0x20000000
#define SYSMODE_HALTED          0x40000000

#define SYSMODE_SEGMASK (SYSMODE_SEG_DS_SS      | \
						 SYSMODE_SEGOVR_CS      | \
						 SYSMODE_SEGOVR_DS      | \
						 SYSMODE_SEGOVR_ES      | \
						 SYSMODE_SEGOVR_FS      | \
						 SYSMODE_SEGOVR_GS      | \
						 SYSMODE_SEGOVR_SS)
#define SYSMODE_CLRMASK (SYSMODE_SEG_DS_SS      | \
						 SYSMODE_SEGOVR_CS      | \
						 SYSMODE_SEGOVR_DS      | \
						 SYSMODE_SEGOVR_ES      | \
						 SYSMODE_SEGOVR_FS      | \
						 SYSMODE_SEGOVR_GS      | \
						 SYSMODE_SEGOVR_SS      | \
						 SYSMODE_PREFIX_DATA    | \
						 SYSMODE_PREFIX_ADDR)

#define  INTR_SYNCH           0x1

#endif /* __X86EMU_REGS_H */