97 lines
2.0 KiB
C
97 lines
2.0 KiB
C
/*
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Copyright 2018 Sam Stevens
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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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 0xFFFF
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#define VM_REG_SIZE 16
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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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#define VM_ERR_MISALIGN 0x1
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#define VM_ERR_UNKNOWN_OP 0x2
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#define VM_ERR_OUT_OF_BOUNDS 0x3
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#ifdef __cplusplus
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extern "C" {
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#endif
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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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uint8_t PC;
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uint8_t carry;
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bool halted;
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uint8_t (*readAddr)(uint16_t addr, bool instruction);
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void (*writeAddr)(uint16_t addr, uint8_t data);
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uint8_t (*syscall)(struct VM_t* vm, uint8_t callno, uint8_t imm);
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void (*error)(uint8_t err);
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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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#ifdef __cplusplus
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}
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#endif
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#endif //UVM_VM_H
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