armmasks.h

一个任天堂掌上游戏机NDS的源代码

/**************************************************************************
* DSemu - The Next Generation                                             *
* Portable ARM cores: Masks and constants [armmasks.h]                    *
* Copyright Imran Nazar, 2005; released under the BSD public licence.     *
**************************************************************************/

#ifndef __ARMMASKS_H
#define __ARMMASKS_H

//---Opcode masks
#define MSK_COND 0xF0000000
#define MSK_OP   0x0FF00000
#define MSK_OPHI 0x0F000000
#define MSK_OPLO 0x00F00000
#define MSK_RN   0x000F0000
#define MSK_RD   0x0000F000
#define MSK_RS   0x00000F00
#define MSK_FUNC 0x000000F0
#define MSK_RM   0x0000000F

#define MSK_IMM8  0x000000FF
#define MSK_IMM12 0x00000FFF
#define MSK_SHFT  0x00000F80

//---Opcode shifts
#define SHFT_COND 28
#define SHFT_OP   20
#define SHFT_OPH  16
#define SHFT_RN   16
#define SHFT_RD   12
#define SHFT_RS    8
#define SHFT_FUNC  4
#define SHFT_RM    0

//---Thumb opcode masks
#define TMSK_OP     0xFF00
#define TMSK_IMM11  0x07FF
#define TMSK_IMM8   0x00FF
#define TMSK_IMM7   0x007F
#define TMSK_IMM5   0x07C0
#define TMSK_RM     0x01C0
#define TMSK_RN     0x0038
#define TMSK_RD     0x0007

//---Thumb opcode shifts
#define TSHFT_OP    8
#define TSHFT_IMM5  6
#define TSHFT_RM    6
#define TSHFT_RN    3
#define TSHFT_RD    0

//---Flag indexes
#define FLAG_N 0
#define FLAG_Z 1
#define FLAG_C 2
#define FLAG_V 3
#define FLAG_T 4
#define FLAG_Q 5

//---CPSR bit masks
#define CPSR_N 0x80000000
#define CPSR_Z 0x40000000
#define CPSR_C 0x20000000
#define CPSR_V 0x10000000
#define CPSR_Q 0x08000000
#define CPSR_I 0x00000080
#define CPSR_F 0x00000040
#define CPSR_T 0x00000020
#define CPSR_M 0x0000001F

#define CPSR_MUSR 0x00000010
#define CPSR_MFIQ 0x00000011
#define CPSR_MIRQ 0x00000012
#define CPSR_MSVC 0x00000013
#define CPSR_MABT 0x00000017
#define CPSR_MUND 0x0000001B
#define CPSR_MSYS 0x0000001F

//---Internal mode IDs
#define MODE_USR 0
#define MODE_FIQ 1
#define MODE_IRQ 2
#define MODE_SVC 3
#define MODE_ABT 4
#define MODE_UND 5
#define MODE_SYS 6

//---Exception vectors
#define VEC_RST 0x00000000
#define VEC_UND 0x00000004
#define VEC_SWI 0x00000008
#define VEC_ABI 0x0000000C
#define VEC_ABD 0x00000010
#define VEC_RSV 0x00000014
#define VEC_IRQ 0x00000018
#define VEC_FIQ 0x0000001C

#endif//__ARMMASKS_H

/*** EOF: armmasks.h *****************************************************/