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