Initial commit

mgba-emu · Apr 4, 2013 · 009bef8 · 009bef8 · DreepyYunky · Feb 11, 2024
commit 009bef8
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diff --git a/.gitignore b/.gitignore
@@ -0,0 +1,2 @@
+/build
+*~
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
@@ -0,0 +1,4 @@
+cmake_minimum_required(VERSION 2.6)
+project(GBAc)
+file(GLOB SOURCES *.c)
+add_executable(gbac ${SOURCES})
diff --git a/src/arm.c b/src/arm.c
@@ -0,0 +1,23 @@
+#include "arm.h"
+
+void ARMInit(struct ARMCore* cpu) {
+	int i;
+	for (i = 0; i < 16; ++i) {
+		cpu->gprs[i] = 0;
+	}
+
+	cpu->cpsr.packed = 0;
+	cpu->spsr.packed = 0;
+
+	cpu->cyclesToEvent = 0;
+
+	cpu->shifterOperand = 0;
+	cpu->shifterCarryOut = 0;
+
+	cpu->memory = 0;
+	cpu->board = 0;
+}
+
+void ARMCycle(struct ARMCore* cpu) {
+	// TODO
+}
diff --git a/src/arm.h b/src/arm.h
@@ -0,0 +1,74 @@
+#ifndef ARM_H
+#define ARM_H
+
+#include <stdint.h>
+
+enum {
+	ARM_SP = 13,
+	ARM_LR = 14,
+	ARM_PC = 15
+};
+
+enum ExecutionMode {
+	MODE_ARM = 0,
+	MODE_THUMB = 1
+};
+
+enum PrivilegeMode {
+	MODE_USER = 0x10,
+	MODE_FIQ = 0x11,
+	MODE_IRQ = 0x12,
+	MODE_SUPERVISOR = 0x13,
+	MODE_ABORT = 0x17,
+	MODE_UNDEFINED = 0x1B,
+	MODE_SYSTEM = 0x1F
+};
+
+enum ExecutionVector {
+	BASE_RESET = 0x00000000,
+	BASE_UNDEF = 0x00000004,
+	BASE_SWI = 0x00000008,
+	BASE_PABT = 0x0000000C,
+	BASE_DABT = 0x00000010,
+	BASE_IRQ = 0x00000018,
+	BASE_FIQ = 0x0000001C
+};
+
+union PSR {
+	struct {
+		int exec : 4;
+		int t : 1;
+		int f : 1;
+		int i : 1;
+		int a : 1;
+		int : 20;
+		int v : 1;
+		int c : 1;
+		int z : 1;
+		int n : 1;
+	};
+
+	int32_t packed;
+};
+
+struct ARMMemory;
+struct ARMBoard;
+
+struct ARMCore {
+	int32_t gprs[16];
+	union PSR cpsr;
+	union PSR spsr;
+
+	int32_t cyclesToEvent;
+
+	int32_t shifterOperand;
+	int32_t shifterCarryOut;
+
+	struct ARMMemory* memory;
+	struct ARMBoard* board;
+};
+
+void ARMInit(struct ARMCore* cpu);
+void ARMCycle(struct ARMCore* cpu);
+
+#endif
diff --git a/src/main.c b/src/main.c
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+#include "arm.h"
+
+int main(int argc, char** argv) {
+	struct ARMCore cpu;
+	ARMInit(&cpu);
+
+	return 0;
+}