1#ifndef ARM_H
  2#define ARM_H
  3
  4#include <stdint.h>
  5
  6enum {
  7	ARM_SP = 13,
  8	ARM_LR = 14,
  9	ARM_PC = 15
 10};
 11
 12enum ExecutionMode {
 13	MODE_ARM = 0,
 14	MODE_THUMB = 1
 15};
 16
 17enum PrivilegeMode {
 18	MODE_USER = 0x10,
 19	MODE_FIQ = 0x11,
 20	MODE_IRQ = 0x12,
 21	MODE_SUPERVISOR = 0x13,
 22	MODE_ABORT = 0x17,
 23	MODE_UNDEFINED = 0x1B,
 24	MODE_SYSTEM = 0x1F
 25};
 26
 27enum WordSize {
 28	WORD_SIZE_ARM = 4,
 29	WORD_SIZE_THUMB = 2
 30};
 31
 32enum ExecutionVector {
 33	BASE_RESET = 0x00000000,
 34	BASE_UNDEF = 0x00000004,
 35	BASE_SWI = 0x00000008,
 36	BASE_PABT = 0x0000000C,
 37	BASE_DABT = 0x00000010,
 38	BASE_IRQ = 0x00000018,
 39	BASE_FIQ = 0x0000001C
 40};
 41
 42struct ARMCore;
 43typedef void (*ARMInstruction)(struct ARMCore*, uint32_t opcode);
 44
 45union PSR {
 46	struct {
 47		enum PrivilegeMode priv : 5;
 48		int t : 1;
 49		int f : 1;
 50		int i : 1;
 51		int : 20;
 52		int v : 1;
 53		int c : 1;
 54		int z : 1;
 55		int n : 1;
 56	};
 57
 58	int32_t packed;
 59};
 60
 61struct ARMMemory {
 62	int32_t (*load32)(struct ARMMemory*, uint32_t address);
 63	int16_t (*load16)(struct ARMMemory*, uint32_t address);
 64	uint16_t (*loadU16)(struct ARMMemory*, uint32_t address);
 65	int8_t (*load8)(struct ARMMemory*, uint32_t address);
 66	uint8_t (*loadU8)(struct ARMMemory*, uint32_t address);
 67
 68	void (*store32)(struct ARMMemory*, uint32_t address, int32_t value);
 69	void (*store16)(struct ARMMemory*, uint32_t address, int16_t value);
 70	void (*store8)(struct ARMMemory*, uint32_t address, int8_t value);
 71};
 72
 73struct ARMBoard {
 74	// TODO
 75};
 76
 77struct ARMCore {
 78	int32_t gprs[16];
 79	union PSR cpsr;
 80	union PSR spsr;
 81
 82	int32_t cyclesToEvent;
 83
 84	int32_t shifterOperand;
 85	int32_t shifterCarryOut;
 86
 87	int instructionWidth;
 88
 89	ARMInstruction (*loadInstruction)(struct ARMMemory*, uint32_t address, uint32_t* opcodeOut);
 90	enum ExecutionMode executionMode;
 91
 92	struct ARMMemory* memory;
 93	struct ARMBoard* board;
 94};
 95
 96void ARMInit(struct ARMCore* cpu);
 97void ARMAssociateMemory(struct ARMCore* cpu, struct ARMMemory* memory);
 98
 99void ARMStep(struct ARMCore* cpu);
100
101#endif