182 lines
No EOL
3.8 KiB
C
182 lines
No EOL
3.8 KiB
C
#pragma once
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#include <stddef.h>
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#include <inttypes.h>
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#if defined(__cplusplus)
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extern "C" {
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#endif
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#if !defined(VM_STACKSIZE)
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#define VM_STACKSIZE 64
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#endif
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// Binary Encoding : (enabled, value)
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#define VM_EXEC_X 0
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#define VM_EXEC_0 2
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#define VM_EXEC_1 3
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#define VM_INPUT_ZERO 0
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#define VM_INPUT_POP 1
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#define VM_INPUT_PEEK 2
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#define VM_INPUT_ARG 3
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#define VM_CMD_COPY 0
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#define VM_CMD_STORE 1
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#define VM_CMD_LOAD 2
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#define VM_CMD_GET 3
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#define VM_CMD_SET 4
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#define VM_CMD_BPGET 5
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#define VM_CMD_BPSET 6
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#define VM_CMD_CPGET 7
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#define VM_CMD_MATH 8
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#define VM_CMD_SPGET 9
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#define VM_CMD_SPSET 10
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#define VM_CMD_SYSCALL 11
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#define VM_CMD_HWIO 12
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#define VM_MATH_ADD 0
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#define VM_MATH_SUB 1
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#define VM_MATH_MUL 2
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#define VM_MATH_DIV 3
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#define VM_MATH_MOD 4
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#define VM_MATH_AND 5
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#define VM_MATH_OR 6
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#define VM_MATH_XOR 7
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#define VM_MATH_NOT 8
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#define VM_MATH_ROL 9
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#define VM_MATH_ROR 10
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#define VM_MATH_ASL 11
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#define VM_MATH_ASR 12
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#define VM_MATH_SHL 13
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#define VM_MATH_SHR 14
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#define VM_FLAG_NO 0
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#define VM_FLAG_YES 1
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#define VM_OUTPUT_DISCARD 0
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#define VM_OUTPUT_PUSH 1
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#define VM_OUTPUT_JUMP 2
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#define VM_FLAG_Z (1<<0)
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#define VM_FLAG_N (1<<1)
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typedef struct
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{
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unsigned int execZ : 2;
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unsigned int execN : 2;
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unsigned int input0 : 2;
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unsigned int input1 : 1;
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unsigned int command : 6;
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unsigned int cmdinfo : 16;
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unsigned int flags : 1;
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unsigned int output : 2;
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uint32_t argument;
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} __attribute__ ((packed)) Instruction;
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_Static_assert(sizeof(Instruction) == 8, "Instruction must be 8 bytes large.");
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_Static_assert(offsetof(Instruction, argument) == 4, "Argument must be must be 8 bytes large.");
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typedef struct
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{
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Instruction *code;
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uint32_t length;
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} Module;
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typedef struct
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{
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uint32_t pageSize;
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uint32_t length;
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uint8_t **pages;
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} VirtualMemoryMap;
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typedef struct
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{
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Module *module;
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void *tag;
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uint32_t codePointer;
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uint32_t stackPointer;
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uint32_t basePointer;
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uint32_t flags;
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uint32_t stack[VM_STACKSIZE];
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VirtualMemoryMap mmap;
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} Process;
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typedef struct
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{
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uint32_t input0;
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uint32_t input1;
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uint32_t argument;
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uint32_t additional;
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uint32_t output;
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} CommandInfo;
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/**
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* @brief Steps a given process.
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*
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* Executes a single instruction and processes input and output.
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*
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* @param process The process to be stepped.
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* @returns 1 if the process is still running or 0 if the process is terminated.
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*/
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int vm_step_process(Process *process);
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/**
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* @brief Pushes a value onto the process' stack.
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*/
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void vm_push(Process *process, uint32_t value);
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/**
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* @brief Pops a value from the process' stack.
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*/
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uint32_t vm_pop(Process *process);
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/**
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* @brief Returns the top value of the process' stack.
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*/
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uint32_t vm_peek(Process *process);
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/**
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* Reads a byte from process memory.
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* @arg process
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* @arg address The address to read from.
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*/
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uint8_t vm_read_byte(Process *process, uint32_t address);
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/**
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* Writes a byte to process memory.
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* @arg process
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* @arg address The address to read from.
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*/
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void vm_write_byte(Process *process, uint32_t address, uint8_t value);
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// The following functions need to be host-implemented.
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/**
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* An assertion the VM does.
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* @param assertion If zero, the assertion failed.
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* @param msg The message that should be shown when the assertion fails.
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*/
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void vm_assert(int assertion, const char *msg);
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/**
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* The hosts syscall implementation.
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* @param process The process that calls the syscall.
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* @param info Additional information for the syscall. Contains arguments and results.
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*/
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void vm_syscall(Process *process, CommandInfo *info);
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/**
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* The hosts hardware IO implementation.
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* @param process The process that wants to do IO.
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* @param info Additional information for the HWIO. Contains arguments and results.
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*/
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void vm_hwio(Process *process, CommandInfo *info);
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#if defined(__cplusplus)
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}
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#endif |