old-DasOS/prototypes/supervm/vm.h
2016-05-21 21:36:34 +02:00

182 lines
No EOL
3.8 KiB
C

#pragma once
#include <stddef.h>
#include <inttypes.h>
#if defined(__cplusplus)
extern "C" {
#endif
#if !defined(VM_STACKSIZE)
#define VM_STACKSIZE 64
#endif
// Binary Encoding : (enabled, value)
#define VM_EXEC_X 0
#define VM_EXEC_0 2
#define VM_EXEC_1 3
#define VM_INPUT_ZERO 0
#define VM_INPUT_POP 1
#define VM_INPUT_PEEK 2
#define VM_INPUT_ARG 3
#define VM_CMD_COPY 0
#define VM_CMD_STORE 1
#define VM_CMD_LOAD 2
#define VM_CMD_GET 3
#define VM_CMD_SET 4
#define VM_CMD_BPGET 5
#define VM_CMD_BPSET 6
#define VM_CMD_CPGET 7
#define VM_CMD_MATH 8
#define VM_CMD_SPGET 9
#define VM_CMD_SPSET 10
#define VM_CMD_SYSCALL 11
#define VM_CMD_HWIO 12
#define VM_MATH_ADD 0
#define VM_MATH_SUB 1
#define VM_MATH_MUL 2
#define VM_MATH_DIV 3
#define VM_MATH_MOD 4
#define VM_MATH_AND 5
#define VM_MATH_OR 6
#define VM_MATH_XOR 7
#define VM_MATH_NOT 8
#define VM_MATH_ROL 9
#define VM_MATH_ROR 10
#define VM_MATH_ASL 11
#define VM_MATH_ASR 12
#define VM_MATH_SHL 13
#define VM_MATH_SHR 14
#define VM_FLAG_NO 0
#define VM_FLAG_YES 1
#define VM_OUTPUT_DISCARD 0
#define VM_OUTPUT_PUSH 1
#define VM_OUTPUT_JUMP 2
#define VM_FLAG_Z (1<<0)
#define VM_FLAG_N (1<<1)
typedef struct
{
unsigned int execZ : 2;
unsigned int execN : 2;
unsigned int input0 : 2;
unsigned int input1 : 1;
unsigned int command : 6;
unsigned int cmdinfo : 16;
unsigned int flags : 1;
unsigned int output : 2;
uint32_t argument;
} __attribute__ ((packed)) Instruction;
_Static_assert(sizeof(Instruction) == 8, "Instruction must be 8 bytes large.");
_Static_assert(offsetof(Instruction, argument) == 4, "Argument must be must be 8 bytes large.");
typedef struct
{
Instruction *code;
uint32_t length;
} Module;
typedef struct
{
uint32_t pageSize;
uint32_t length;
uint8_t **pages;
} VirtualMemoryMap;
typedef struct
{
Module *module;
void *tag;
uint32_t codePointer;
uint32_t stackPointer;
uint32_t basePointer;
uint32_t flags;
uint32_t stack[VM_STACKSIZE];
VirtualMemoryMap mmap;
} Process;
typedef struct
{
uint32_t input0;
uint32_t input1;
uint32_t argument;
uint32_t additional;
uint32_t output;
} CommandInfo;
/**
* @brief Steps a given process.
*
* Executes a single instruction and processes input and output.
*
* @param process The process to be stepped.
* @returns 1 if the process is still running or 0 if the process is terminated.
*/
int vm_step_process(Process *process);
/**
* @brief Pushes a value onto the process' stack.
*/
void vm_push(Process *process, uint32_t value);
/**
* @brief Pops a value from the process' stack.
*/
uint32_t vm_pop(Process *process);
/**
* @brief Returns the top value of the process' stack.
*/
uint32_t vm_peek(Process *process);
/**
* Reads a byte from process memory.
* @arg process
* @arg address The address to read from.
*/
uint8_t vm_read_byte(Process *process, uint32_t address);
/**
* Writes a byte to process memory.
* @arg process
* @arg address The address to read from.
*/
void vm_write_byte(Process *process, uint32_t address, uint8_t value);
// The following functions need to be host-implemented.
/**
* An assertion the VM does.
* @param assertion If zero, the assertion failed.
* @param msg The message that should be shown when the assertion fails.
*/
void vm_assert(int assertion, const char *msg);
/**
* The hosts syscall implementation.
* @param process The process that calls the syscall.
* @param info Additional information for the syscall. Contains arguments and results.
*/
void vm_syscall(Process *process, CommandInfo *info);
/**
* The hosts hardware IO implementation.
* @param process The process that wants to do IO.
* @param info Additional information for the HWIO. Contains arguments and results.
*/
void vm_hwio(Process *process, CommandInfo *info);
#if defined(__cplusplus)
}
#endif