Initial Commit`

vm.h

@@ -0,0 +1,70 @@
+//
+// Created by Sam on 27/08/2018.
+//
+
+#ifndef UVM_VM_H
+#define UVM_VM_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#define VM_MEM_SIZE (1<<8)-1
+#define VM_REG_SIZE 15
+
+#define OP_HLT 0x0
+#define OP_LDA 0x1
+#define OP_STA 0x2
+#define OP_LDI 0x3
+#define OP_ADD 0x4
+#define OP_ADC 0x5
+#define OP_SUB 0x6
+#define OP_SBC 0x7
+#define OP_NOT 0x8
+#define OP_AND 0x9
+#define OP_SHL 0xa
+#define OP_SHR 0xb
+#define OP_SYS 0xc
+#define OP_JMP 0xd
+#define OP_JEQ 0xe
+#define OP_JLT 0xf
+
+struct VM_Instruction_t {
+    uint8_t op;
+    uint8_t rd;
+    uint8_t rx;
+    uint8_t ry;
+    uint8_t imm;
+};
+typedef struct VM_Instruction_t VM_Instruction;
+
+struct VM_t {
+    uint8_t R[VM_REG_SIZE];
+    uint16_t PC;
+    uint8_t M[VM_MEM_SIZE];
+    uint8_t carry;
+    bool halted;
+    uint8_t (*syscall)(struct VM_t* vm, uint8_t callno);
+};
+typedef struct VM_t VM;
+
+VM * new_vm();
+
+void free_vm(VM *vm);
+
+void vm_reset(VM *vm);
+
+void vm_clear(VM *vm);
+
+uint8_t vm_get_r(VM *vm, uint8_t r);
+
+void vm_put_r(VM *vm, uint8_t r, uint8_t v);
+
+void vm_decode_Q(VM_Instruction *inst, uint16_t raw);
+void vm_decode_S(VM_Instruction *inst, uint16_t raw);
+void vm_decode_T(VM_Instruction *inst, uint16_t raw);
+
+uint8_t vm_subtract(uint8_t x, uint8_t y, uint8_t *ptr_borrow);
+
+void vm_step(VM *vm);
+
+#endif //UVM_VM_H