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arm7core.h
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arm7core.h
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/*****************************************************************************
*
* arm7core.h
* Portable ARM7TDMI Core Emulator
*
* Copyright Steve Ellenoff, all rights reserved.
*
* - This source code is released as freeware for non-commercial purposes.
* - You are free to use and redistribute this code in modified or
* unmodified form, provided you list me in the credits.
* - If you modify this source code, you must add a notice to each modified
* source file that it has been changed. If you're a nice person, you
* will clearly mark each change too. :)
* - If you wish to use this for commercial purposes, please contact me at
* - The author of this copywritten work reserves the right to change the
* terms of its usage and license at any time, including retroactively
* - This entire notice must remain in the source code.
*
* This work is based on:
* #1) 'Atmel Corporation ARM7TDMI (Thumb) Datasheet - January 1999'
* #2) Arm 2/3/6 emulator By Bryan McPhail ([email protected]) and Phil Stroffolino (MAME CORE 0.76)
*
*****************************************************************************
This file contains everything related to the arm7 core itself, and is presumed
to be cpu implementation non-specific, ie, applies to only the core.
******************************************************************************/
#pragma once
#ifndef __ARM7CORE_H__
#define __ARM7CORE_H__
/****************************************************************************************************
* INTERRUPT LINES/EXCEPTIONS
***************************************************************************************************/
enum
{
ARM7_IRQ_LINE=0, ARM7_FIRQ_LINE,
ARM7_ABORT_EXCEPTION, ARM7_ABORT_PREFETCH_EXCEPTION, ARM7_UNDEFINE_EXCEPTION,
ARM7_NUM_LINES
};
// Really there's only 1 ABORT Line.. and cpu decides whether it's during data fetch or prefetch, but we let the user specify
/****************************************************************************************************
* ARM7 CORE REGISTERS
***************************************************************************************************/
enum
{
ARM7_PC = 0,
ARM7_R0, ARM7_R1, ARM7_R2, ARM7_R3, ARM7_R4, ARM7_R5, ARM7_R6, ARM7_R7,
ARM7_R8, ARM7_R9, ARM7_R10, ARM7_R11, ARM7_R12, ARM7_R13, ARM7_R14, ARM7_R15,
ARM7_FR8, ARM7_FR9, ARM7_FR10, ARM7_FR11, ARM7_FR12, ARM7_FR13, ARM7_FR14,
ARM7_IR13, ARM7_IR14, ARM7_SR13, ARM7_SR14, ARM7_FSPSR, ARM7_ISPSR, ARM7_SSPSR,
ARM7_CPSR, ARM7_AR13, ARM7_AR14, ARM7_ASPSR, ARM7_UR13, ARM7_UR14, ARM7_USPSR
};
/* There are 36 Unique - 32 bit processor registers */
/* Each mode has 17 registers (except user & system, which have 16) */
/* This is a list of each *unique* register */
enum
{
/* All modes have the following */
eR0 = 0, eR1, eR2, eR3, eR4, eR5, eR6, eR7,
eR8, eR9, eR10, eR11, eR12,
eR13, /* Stack Pointer */
eR14, /* Link Register (holds return address) */
eR15, /* Program Counter */
eCPSR, /* Current Status Program Register */
/* Fast Interrupt - Bank switched registers */
eR8_FIQ, eR9_FIQ, eR10_FIQ, eR11_FIQ, eR12_FIQ, eR13_FIQ, eR14_FIQ, eSPSR_FIQ,
/* IRQ - Bank switched registers */
eR13_IRQ, eR14_IRQ, eSPSR_IRQ,
/* Supervisor/Service Mode - Bank switched registers */
eR13_SVC, eR14_SVC, eSPSR_SVC,
/* Abort Mode - Bank switched registers */
eR13_ABT, eR14_ABT, eSPSR_ABT,
/* Undefined Mode - Bank switched registers */
eR13_UND, eR14_UND, eSPSR_UND,
kNumRegisters
};
/* Coprocessor-related macros */
#define COPRO_TLB_BASE cpustate->tlbBase
#define COPRO_TLB_BASE_MASK 0xffffc000
#define COPRO_TLB_VADDR_FLTI_MASK 0xfff00000
#define COPRO_TLB_VADDR_FLTI_MASK_SHIFT 18
#define COPRO_TLB_VADDR_CSLTI_MASK 0x000ff000
#define COPRO_TLB_VADDR_CSLTI_MASK_SHIFT 10
#define COPRO_TLB_VADDR_FSLTI_MASK 0x000ffc00
#define COPRO_TLB_VADDR_FSLTI_MASK_SHIFT 8
#define COPRO_TLB_CFLD_ADDR_MASK 0xfffffc00
#define COPRO_TLB_CFLD_ADDR_MASK_SHIFT 10
#define COPRO_TLB_SECTION_PAGE_MASK 0xfff00000
#define COPRO_TLB_LARGE_PAGE_MASK 0xffff0000
#define COPRO_TLB_SMALL_PAGE_MASK 0xfffff000
#define COPRO_TLB_TINY_PAGE_MASK 0xfffffc00
#define COPRO_TLB_UNMAPPED 0
#define COPRO_TLB_LARGE_PAGE 1
#define COPRO_TLB_SMALL_PAGE 2
#define COPRO_TLB_TINY_PAGE 3
#define COPRO_TLB_COARSE_TABLE 1
#define COPRO_TLB_SECTION_TABLE 2
#define COPRO_TLB_FINE_TABLE 3
#define COPRO_CTRL cpustate->control
#define COPRO_CTRL_MMU_EN 0x00000001
#define COPRO_CTRL_ADDRFAULT_EN 0x00000002
#define COPRO_CTRL_DCACHE_EN 0x00000004
#define COPRO_CTRL_WRITEBUF_EN 0x00000008
#define COPRO_CTRL_ENDIAN 0x00000080
#define COPRO_CTRL_SYSTEM 0x00000100
#define COPRO_CTRL_ROM 0x00000200
#define COPRO_CTRL_ICACHE_EN 0x00001000
#define COPRO_CTRL_INTVEC_ADJUST 0x00002000
#define COPRO_CTRL_ADDRFAULT_EN_SHIFT 1
#define COPRO_CTRL_DCACHE_EN_SHIFT 2
#define COPRO_CTRL_WRITEBUF_EN_SHIFT 3
#define COPRO_CTRL_ENDIAN_SHIFT 7
#define COPRO_CTRL_SYSTEM_SHIFT 8
#define COPRO_CTRL_ROM_SHIFT 9
#define COPRO_CTRL_ICACHE_EN_SHIFT 12
#define COPRO_CTRL_INTVEC_ADJUST_SHIFT 13
#define COPRO_CTRL_LITTLE_ENDIAN 0
#define COPRO_CTRL_BIG_ENDIAN 1
#define COPRO_CTRL_INTVEC_0 0
#define COPRO_CTRL_INTVEC_F 1
#define COPRO_CTRL_MASK 0x0000338f
/* Coprocessor Registers */
#define ARM7COPRO_REGS \
UINT32 control; \
UINT32 tlbBase;
enum
{
eARM_ARCHFLAGS_T = 1, // Thumb present
eARM_ARCHFLAGS_E = 2, // extended DSP operations present (only for v5+)
eARM_ARCHFLAGS_J = 4, // "Jazelle" (direct execution of Java bytecode)
eARM_ARCHFLAGS_MMU = 8, // has on-board MMU (traditional ARM style like the SA1110)
eARM_ARCHFLAGS_SA = 16, // StrongARM extensions (enhanced TLB)
eARM_ARCHFLAGS_XSCALE = 32, // XScale extensions (CP14, enhanced TLB)
};
#define ARM7CORE_REGS \
UINT32 sArmRegister[kNumRegisters]; \
UINT8 pendingIrq; \
UINT8 pendingFiq; \
UINT8 pendingAbtD; \
UINT8 pendingAbtP; \
UINT8 pendingUnd; \
UINT8 pendingSwi; \
INT32 iCount; \
endianness_t endian; \
device_irq_callback irq_callback; \
legacy_cpu_device *device; \
address_space *program; \
direct_read_data *direct;
/* CPU state struct */
typedef struct
{
ARM7CORE_REGS // these must be included in your cpu specific register implementation
ARM7COPRO_REGS
UINT8 archRev; // ARM architecture revision (3, 4, and 5 are valid)
UINT8 archFlags; // architecture flags
} arm_state;
/****************************************************************************************************
* VARIOUS INTERNAL STRUCS/DEFINES/ETC..
***************************************************************************************************/
// Mode values come from bit 4-0 of CPSR, but we are ignoring bit 4 here, since bit 4 always = 1 for valid modes
enum
{
eARM7_MODE_USER = 0x0, // Bit: 4-0 = 10000
eARM7_MODE_FIQ = 0x1, // Bit: 4-0 = 10001
eARM7_MODE_IRQ = 0x2, // Bit: 4-0 = 10010
eARM7_MODE_SVC = 0x3, // Bit: 4-0 = 10011
eARM7_MODE_ABT = 0x7, // Bit: 4-0 = 10111
eARM7_MODE_UND = 0xb, // Bit: 4-0 = 11011
eARM7_MODE_SYS = 0xf // Bit: 4-0 = 11111
};
#define ARM7_NUM_MODES 0x10
static const int thumbCycles[256] =
{
// 0 1 2 3 4 5 6 7 8 9 a b c d e f
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 1
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 2
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 3
1, 1, 1, 1, 1, 1, 1, 3, 3, 3, 3, 3, 3, 3, 3, 3, // 4
2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, // 5
2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, // 6
2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, // 7
2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, // 8
2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, // 9
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, // a
1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 1, 1, 2, 4, 1, 1, // b
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, // c
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, // d
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, // e
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2 // f
};
/* 17 processor registers are visible at any given time,
* banked depending on processor mode.
*/
static const int sRegisterTable[ARM7_NUM_MODES][18] =
{
{ /* USR */
eR0, eR1, eR2, eR3, eR4, eR5, eR6, eR7,
eR8, eR9, eR10, eR11, eR12,
eR13, eR14,
eR15, eCPSR // No SPSR in this mode
},
{ /* FIQ */
eR0, eR1, eR2, eR3, eR4, eR5, eR6, eR7,
eR8_FIQ, eR9_FIQ, eR10_FIQ, eR11_FIQ, eR12_FIQ,
eR13_FIQ, eR14_FIQ,
eR15, eCPSR, eSPSR_FIQ
},
{ /* IRQ */
eR0, eR1, eR2, eR3, eR4, eR5, eR6, eR7,
eR8, eR9, eR10, eR11, eR12,
eR13_IRQ, eR14_IRQ,
eR15, eCPSR, eSPSR_IRQ
},
{ /* SVC */
eR0, eR1, eR2, eR3, eR4, eR5, eR6, eR7,
eR8, eR9, eR10, eR11, eR12,
eR13_SVC, eR14_SVC,
eR15, eCPSR, eSPSR_SVC
},
{0}, {0}, {0}, // values for modes 4,5,6 are not valid
{ /* ABT */
eR0, eR1, eR2, eR3, eR4, eR5, eR6, eR7,
eR8, eR9, eR10, eR11, eR12,
eR13_ABT, eR14_ABT,
eR15, eCPSR, eSPSR_ABT
},
{0}, {0}, {0}, // values for modes 8,9,a are not valid!
{ /* UND */
eR0, eR1, eR2, eR3, eR4, eR5, eR6, eR7,
eR8, eR9, eR10, eR11, eR12,
eR13_UND, eR14_UND,
eR15, eCPSR, eSPSR_UND
},
{0}, {0}, {0}, // values for modes c,d, e are not valid!
{ /* SYS */
eR0, eR1, eR2, eR3, eR4, eR5, eR6, eR7,
eR8, eR9, eR10, eR11, eR12,
eR13, eR14,
eR15, eCPSR // No SPSR in this mode
}
};
#define N_BIT 31
#define Z_BIT 30
#define C_BIT 29
#define V_BIT 28
#define Q_BIT 27
#define I_BIT 7
#define F_BIT 6
#define T_BIT 5 // Thumb mode
#define N_MASK ((UINT32)(1 << N_BIT)) /* Negative flag */
#define Z_MASK ((UINT32)(1 << Z_BIT)) /* Zero flag */
#define C_MASK ((UINT32)(1 << C_BIT)) /* Carry flag */
#define V_MASK ((UINT32)(1 << V_BIT)) /* oVerflow flag */
#define Q_MASK ((UINT32)(1 << Q_BIT)) /* signed overflow for QADD, MAC */
#define I_MASK ((UINT32)(1 << I_BIT)) /* Interrupt request disable */
#define F_MASK ((UINT32)(1 << F_BIT)) /* Fast interrupt request disable */
#define T_MASK ((UINT32)(1 << T_BIT)) /* Thumb Mode flag */
#define N_IS_SET(pc) ((pc) & N_MASK)
#define Z_IS_SET(pc) ((pc) & Z_MASK)
#define C_IS_SET(pc) ((pc) & C_MASK)
#define V_IS_SET(pc) ((pc) & V_MASK)
#define Q_IS_SET(pc) ((pc) & Q_MASK)
#define I_IS_SET(pc) ((pc) & I_MASK)
#define F_IS_SET(pc) ((pc) & F_MASK)
#define T_IS_SET(pc) ((pc) & T_MASK)
#define N_IS_CLEAR(pc) (!N_IS_SET(pc))
#define Z_IS_CLEAR(pc) (!Z_IS_SET(pc))
#define C_IS_CLEAR(pc) (!C_IS_SET(pc))
#define V_IS_CLEAR(pc) (!V_IS_SET(pc))
#define Q_IS_CLEAR(pc) (!Q_IS_SET(pc))
#define I_IS_CLEAR(pc) (!I_IS_SET(pc))
#define F_IS_CLEAR(pc) (!F_IS_SET(pc))
#define T_IS_CLEAR(pc) (!T_IS_SET(pc))
/* Deconstructing an instruction */
// todo: use these in all places (including dasm file)
#define INSN_COND ((UINT32)0xf0000000u)
#define INSN_SDT_L ((UINT32)0x00100000u)
#define INSN_SDT_W ((UINT32)0x00200000u)
#define INSN_SDT_B ((UINT32)0x00400000u)
#define INSN_SDT_U ((UINT32)0x00800000u)
#define INSN_SDT_P ((UINT32)0x01000000u)
#define INSN_BDT_L ((UINT32)0x00100000u)
#define INSN_BDT_W ((UINT32)0x00200000u)
#define INSN_BDT_S ((UINT32)0x00400000u)
#define INSN_BDT_U ((UINT32)0x00800000u)
#define INSN_BDT_P ((UINT32)0x01000000u)
#define INSN_BDT_REGS ((UINT32)0x0000ffffu)
#define INSN_SDT_IMM ((UINT32)0x00000fffu)
#define INSN_MUL_A ((UINT32)0x00200000u)
#define INSN_MUL_RM ((UINT32)0x0000000fu)
#define INSN_MUL_RS ((UINT32)0x00000f00u)
#define INSN_MUL_RN ((UINT32)0x0000f000u)
#define INSN_MUL_RD ((UINT32)0x000f0000u)
#define INSN_I ((UINT32)0x02000000u)
#define INSN_OPCODE ((UINT32)0x01e00000u)
#define INSN_S ((UINT32)0x00100000u)
#define INSN_BL ((UINT32)0x01000000u)
#define INSN_BRANCH ((UINT32)0x00ffffffu)
#define INSN_SWI ((UINT32)0x00ffffffu)
#define INSN_RN ((UINT32)0x000f0000u)
#define INSN_RD ((UINT32)0x0000f000u)
#define INSN_OP2 ((UINT32)0x00000fffu)
#define INSN_OP2_SHIFT ((UINT32)0x00000f80u)
#define INSN_OP2_SHIFT_TYPE ((UINT32)0x00000070u)
#define INSN_OP2_RM ((UINT32)0x0000000fu)
#define INSN_OP2_ROTATE ((UINT32)0x00000f00u)
#define INSN_OP2_IMM ((UINT32)0x000000ffu)
#define INSN_OP2_SHIFT_TYPE_SHIFT 4
#define INSN_OP2_SHIFT_SHIFT 7
#define INSN_OP2_ROTATE_SHIFT 8
#define INSN_MUL_RS_SHIFT 8
#define INSN_MUL_RN_SHIFT 12
#define INSN_MUL_RD_SHIFT 16
#define INSN_OPCODE_SHIFT 21
#define INSN_RN_SHIFT 16
#define INSN_RD_SHIFT 12
#define INSN_COND_SHIFT 28
#define INSN_COPRO_N ((UINT32) 0x00100000u)
#define INSN_COPRO_CREG ((UINT32) 0x000f0000u)
#define INSN_COPRO_AREG ((UINT32) 0x0000f000u)
#define INSN_COPRO_CPNUM ((UINT32) 0x00000f00u)
#define INSN_COPRO_OP2 ((UINT32) 0x000000e0u)
#define INSN_COPRO_OP3 ((UINT32) 0x0000000fu)
#define INSN_COPRO_N_SHIFT 20
#define INSN_COPRO_CREG_SHIFT 16
#define INSN_COPRO_AREG_SHIFT 12
#define INSN_COPRO_CPNUM_SHIFT 8
#define INSN_COPRO_OP2_SHIFT 5
#define THUMB_INSN_TYPE ((UINT16)0xf000)
#define THUMB_COND_TYPE ((UINT16)0x0f00)
#define THUMB_GROUP4_TYPE ((UINT16)0x0c00)
#define THUMB_GROUP5_TYPE ((UINT16)0x0e00)
#define THUMB_GROUP5_RM ((UINT16)0x01c0)
#define THUMB_GROUP5_RN ((UINT16)0x0038)
#define THUMB_GROUP5_RD ((UINT16)0x0007)
#define THUMB_ADDSUB_RNIMM ((UINT16)0x01c0)
#define THUMB_ADDSUB_RS ((UINT16)0x0038)
#define THUMB_ADDSUB_RD ((UINT16)0x0007)
#define THUMB_INSN_ADDSUB ((UINT16)0x0800)
#define THUMB_INSN_CMP ((UINT16)0x0800)
#define THUMB_INSN_SUB ((UINT16)0x0800)
#define THUMB_INSN_IMM_RD ((UINT16)0x0700)
#define THUMB_INSN_IMM_S ((UINT16)0x0080)
#define THUMB_INSN_IMM ((UINT16)0x00ff)
#define THUMB_ADDSUB_TYPE ((UINT16)0x0600)
#define THUMB_HIREG_OP ((UINT16)0x0300)
#define THUMB_HIREG_H ((UINT16)0x00c0)
#define THUMB_HIREG_RS ((UINT16)0x0038)
#define THUMB_HIREG_RD ((UINT16)0x0007)
#define THUMB_STACKOP_TYPE ((UINT16)0x0f00)
#define THUMB_STACKOP_L ((UINT16)0x0800)
#define THUMB_STACKOP_RD ((UINT16)0x0700)
#define THUMB_ALUOP_TYPE ((UINT16)0x03c0)
#define THUMB_BLOP_LO ((UINT16)0x0800)
#define THUMB_BLOP_OFFS ((UINT16)0x07ff)
#define THUMB_SHIFT_R ((UINT16)0x0800)
#define THUMB_SHIFT_AMT ((UINT16)0x07c0)
#define THUMB_HALFOP_L ((UINT16)0x0800)
#define THUMB_HALFOP_OFFS ((UINT16)0x07c0)
#define THUMB_BRANCH_OFFS ((UINT16)0x07ff)
#define THUMB_LSOP_L ((UINT16)0x0800)
#define THUMB_LSOP_OFFS ((UINT16)0x07c0)
#define THUMB_MULTLS ((UINT16)0x0800)
#define THUMB_MULTLS_BASE ((UINT16)0x0700)
#define THUMB_RELADDR_SP ((UINT16)0x0800)
#define THUMB_RELADDR_RD ((UINT16)0x0700)
#define THUMB_INSN_TYPE_SHIFT 12
#define THUMB_COND_TYPE_SHIFT 8
#define THUMB_GROUP4_TYPE_SHIFT 10
#define THUMB_GROUP5_TYPE_SHIFT 9
#define THUMB_ADDSUB_TYPE_SHIFT 9
#define THUMB_INSN_IMM_RD_SHIFT 8
#define THUMB_STACKOP_TYPE_SHIFT 8
#define THUMB_HIREG_OP_SHIFT 8
#define THUMB_STACKOP_RD_SHIFT 8
#define THUMB_MULTLS_BASE_SHIFT 8
#define THUMB_RELADDR_RD_SHIFT 8
#define THUMB_HIREG_H_SHIFT 6
#define THUMB_HIREG_RS_SHIFT 3
#define THUMB_ALUOP_TYPE_SHIFT 6
#define THUMB_SHIFT_AMT_SHIFT 6
#define THUMB_HALFOP_OFFS_SHIFT 6
#define THUMB_LSOP_OFFS_SHIFT 6
#define THUMB_GROUP5_RM_SHIFT 6
#define THUMB_GROUP5_RN_SHIFT 3
#define THUMB_GROUP5_RD_SHIFT 0
#define THUMB_ADDSUB_RNIMM_SHIFT 6
#define THUMB_ADDSUB_RS_SHIFT 3
#define THUMB_ADDSUB_RD_SHIFT 0
enum
{
OPCODE_AND, /* 0000 */
OPCODE_EOR, /* 0001 */
OPCODE_SUB, /* 0010 */
OPCODE_RSB, /* 0011 */
OPCODE_ADD, /* 0100 */
OPCODE_ADC, /* 0101 */
OPCODE_SBC, /* 0110 */
OPCODE_RSC, /* 0111 */
OPCODE_TST, /* 1000 */
OPCODE_TEQ, /* 1001 */
OPCODE_CMP, /* 1010 */
OPCODE_CMN, /* 1011 */
OPCODE_ORR, /* 1100 */
OPCODE_MOV, /* 1101 */
OPCODE_BIC, /* 1110 */
OPCODE_MVN /* 1111 */
};
enum
{
COND_EQ = 0, /* Z equal */
COND_NE, /* ~Z not equal */
COND_CS, COND_HS = 2, /* C unsigned higher or same */
COND_CC, COND_LO = 3, /* ~C unsigned lower */
COND_MI, /* N negative */
COND_PL, /* ~N positive or zero */
COND_VS, /* V overflow */
COND_VC, /* ~V no overflow */
COND_HI, /* C && ~Z unsigned higher */
COND_LS, /* ~C || Z unsigned lower or same */
COND_GE, /* N == V greater or equal */
COND_LT, /* N != V less than */
COND_GT, /* ~Z && N == V greater than */
COND_LE, /* Z || N != V less than or equal */
COND_AL, /* 1 always */
COND_NV /* 0 never */
};
#define LSL(v, s) ((v) << (s))
#define LSR(v, s) ((v) >> (s))
#define ROL(v, s) (LSL((v), (s)) | (LSR((v), 32u - (s))))
#define ROR(v, s) (LSR((v), (s)) | (LSL((v), 32u - (s))))
/* Convenience Macros */
#define R15 ARM7REG(eR15)
#define SPSR 17 // SPSR is always the 18th register in our 0 based array sRegisterTable[][18]
#define GET_CPSR ARM7REG(eCPSR)
#define SET_CPSR(v) (GET_CPSR = (v))
#define MODE_FLAG 0xF // Mode bits are 4:0 of CPSR, but we ignore bit 4.
#define GET_MODE (GET_CPSR & MODE_FLAG)
#define SIGN_BIT ((UINT32)(1 << 31))
#define SIGN_BITS_DIFFER(a, b) (((a) ^ (b)) >> 31)
/* I really don't know why these were set to 16-bit, the thumb registers are still 32-bit ... */
#define THUMB_SIGN_BIT ((UINT32)(1 << 31))
#define THUMB_SIGN_BITS_DIFFER(a, b) (((a)^(b)) >> 31)
/* At one point I thought these needed to be cpu implementation specific, but they don't.. */
#define GET_REGISTER(state, reg) GetRegister(state, reg)
#define SET_REGISTER(state, reg, val) SetRegister(state, reg, val)
#define ARM7_CHECKIRQ arm7_check_irq_state(cpustate)
extern write32_device_func arm7_coproc_do_callback;
extern read32_device_func arm7_coproc_rt_r_callback;
extern write32_device_func arm7_coproc_rt_w_callback;
extern void arm7_dt_r_callback(arm_state *cpustate, UINT32 insn, UINT32 *prn, UINT32 (*read32)(arm_state *cpustate, UINT32 addr));
extern void arm7_dt_w_callback(arm_state *cpustate, UINT32 insn, UINT32 *prn, void (*write32)(arm_state *cpustate, UINT32 addr, UINT32 data));
#ifdef UNUSED_DEFINITION
extern char *(*arm7_dasm_cop_dt_callback)(arm_state *cpustate, char *pBuf, UINT32 opcode, char *pConditionCode, char *pBuf0);
extern char *(*arm7_dasm_cop_rt_callback)(arm_state *cpustate, char *pBuf, UINT32 opcode, char *pConditionCode, char *pBuf0);
extern char *(*arm7_dasm_cop_do_callback)(arm_state *cpustate, char *pBuf, UINT32 opcode, char *pConditionCode, char *pBuf0);
#endif
#endif /* __ARM7CORE_H__ */