zongor
/
undar-lang
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
undar-lang/src/vm/vm.c

551 lines
14 KiB
C
Raw Blame History

#include "vm.h"
#include "device.h"
#include "opcodes.h"
#include "str.h"
#define COMPARE_AND_JUMP(type, op) \
do { \
i32 cond; \
u32 mask, target; \
type value; \
type value2; \
target = read_u32(vm, code, vm->pc); \
vm->pc += 4; \
value2 = (type)vm->stack[--vm->sp]; \
value = (type)vm->stack[--vm->sp]; \
cond = !!(value op value2); \
mask = -(u32)cond; \
vm->pc = (target & mask) | (vm->pc & ~mask); \
return true; \
} while (0)
#define MATH_OP(type, op) \
do { \
type b = (type)vm->stack[--vm->sp]; \
type a = (type)vm->stack[--vm->sp]; \
vm->stack[vm->sp++] = (type)(a op b); \
return true; \
} while (0)
#define BIT_OP(op) \
do { \
u32 a = vm->stack[--vm->sp]; \
u32 b = vm->stack[--vm->sp]; \
vm->stack[vm->sp++] = a op b; \
return true; \
} while (0)
u32 str_alloc(VM *vm, Frame *frame, const char *str, u32 length) {
u32 str_addr = vm->mp;
u32 i = 0;
vm->mp += 4;
while (i < length) {
vm->memory[vm->mp++] = str[i++];
}
vm->memory[vm->mp++] = '\0';
write_u32(vm, memory, str_addr, length);
frame->end = vm->mp;
return str_addr;
}
/**
* Step to the next opcode in the vm.
*/
bool step_vm(VM *vm) {
/* Get current instruction & Advance to next instruction */
u8 opcode = vm->code[vm->pc++];
Frame *frame = &vm->frames[vm->fp];
switch (opcode) {
case OP_HALT: {
return false;
}
case OP_CALL: {
u32 jmp = read_u32(vm, code, vm->pc); /* location of function in code */
vm->pc += 4;
vm->return_stack[vm->rp++] = vm->pc; /* set return address */
vm->fp++; /* increment to the next free frame */
vm->frames[vm->fp].start = vm->mp; /* set start of new memory block */
vm->pc = jmp;
return true;
}
case OP_RETURN: {
vm->pc = vm->return_stack[--vm->rp]; /* set pc to return address */
vm->mp =
vm->frames[vm->fp--].start; /* reset memory pointer to start
of old slice, pop the frame */
return true;
}
case OP_MALLOC: {
u32 size = read_u32(vm, code, vm->pc);
vm->pc++;
vm->stack[vm->sp++] = vm->mp;
write_u32(vm, memory, vm->mp, size);
vm->mp += (size + 4);
return true;
}
case OP_MEMSET_32: {
u32 i, start, end;
u32 dest = vm->stack[--vm->sp];
u32 value = vm->stack[--vm->sp];
u32 count = vm->stack[--vm->sp];
if (count == 0) {
vm->flag = 1;
return true;
}
start = dest;
end = dest + count;
if (start >= vm->mp || count > vm->mp || end > vm->mp) {
vm->flag = 0;
return true;
}
for (i = start; i < end; i += 4) {
write_u32(vm, memory, i, value);
}
vm->stack[vm->sp++] = dest;
vm->flag = 1;
return true;
}
case OP_MEMSET_16: {
u32 i, start, end;
u32 dest = vm->stack[--vm->sp];
u16 value = (u16)(vm->stack[--vm->sp]);
u32 count = vm->stack[--vm->sp];
if (count == 0) {
vm->flag = 1;
return true;
}
start = dest;
end = dest + count;
if (start >= vm->mp || count > vm->mp || end > vm->mp) {
vm->flag = 0;
return true;
}
for (i = start; i < end; i += 2) {
write_u16(vm, memory, i, value);
}
vm->stack[vm->sp++] = dest;
vm->flag = 1;
return true;
}
case OP_MEMSET_8: {
u32 i, start, end;
u32 dest = vm->stack[--vm->sp];
u8 value = (u8)(vm->stack[--vm->sp]);
u32 count = vm->stack[--vm->sp];
if (count == 0) {
vm->flag = 1;
return true;
}
start = dest;
end = dest + count;
if (start >= vm->mp || count > vm->mp || end > vm->mp) {
vm->flag = 0;
return true;
}
for (i = start; i < end; i++) {
write_u8(vm, memory, i, value);
}
vm->stack[vm->sp++] = dest;
vm->flag = 1;
return true;
}
case OP_LOAD_8: {
u32 addr = vm->stack[--vm->sp];
vm->stack[vm->sp++] = read_u8(vm, memory, addr);
return true;
}
case OP_LOAD_16: {
u32 addr = vm->stack[--vm->sp];
vm->stack[vm->sp++] = read_u16(vm, memory, addr);
return true;
}
case OP_LOAD_32: {
u32 addr = vm->stack[--vm->sp];
vm->stack[vm->sp++] = read_u32(vm, memory, addr);
return true;
}
case OP_STORE_8: {
u8 value = vm->stack[--vm->sp];
u32 addr = vm->stack[--vm->sp];
write_u8(vm, memory, addr, value);
return true;
}
case OP_STORE_16: {
u16 value = vm->stack[--vm->sp];
u32 addr = vm->stack[--vm->sp];
write_u16(vm, memory, addr, value);
return true;
}
case OP_STORE_32: {
u32 value = vm->stack[--vm->sp];
u32 addr = vm->stack[--vm->sp];
write_u32(vm, memory, addr, value);
return true;
}
case OP_PUSH: {
u32 val = read_u32(vm, code, vm->pc);
vm->pc += 4;
vm->stack[vm->sp++] = val;
return true;
}
case OP_POP: {
vm->sp--;
return true;
}
case OP_DUP: {
u32 a = vm->stack[--vm->sp];
vm->stack[vm->sp++] = a;
vm->stack[vm->sp++] = a;
return true;
}
case OP_EXCH: {
u32 a = vm->stack[--vm->sp];
u32 b = vm->stack[--vm->sp];
vm->stack[vm->sp++] = b;
vm->stack[vm->sp++] = a;
return true;
}
case OP_OVER: {
u32 a = vm->stack[vm->sp - 1];
vm->stack[vm->sp++] = a;
return true;
}
case OP_PICK: {
u32 n = vm->stack[--vm->sp];
u32 b = vm->stack[vm->sp - n];
vm->stack[vm->sp++] = b;
return true;
}
case OP_ROT: {
return false;
}
case OP_DEPTH: {
u32 a = vm->sp;
vm->stack[vm->sp++] = a;
return true;
}
case OP_JMP: {
u32 dest = read_u32(vm, code, vm->pc);
vm->pc += 4;
vm->pc = dest; /* Jump to address */
return true;
}
case OP_JMPF: { /* error handling for syscall, jump if flag == 0 */
u32 mask, dest = read_u32(vm, code, vm->pc);
vm->pc += 4;
mask = -(u32)(vm->flag == 0);
vm->pc = (dest & mask) | (vm->pc & ~mask);
return true;
}
case OP_SYSCALL: {
u32 syscall_id;
syscall_id = read_u32(vm, code, vm->pc);
vm->pc += 4;
switch (syscall_id) {
case SYSCALL_DEVICE_OPEN: {
Device *dev;
u32 path_ptr = vm->stack[--vm->sp];
u32 mode = vm->stack[--vm->sp];
dev = find_device_by_path(vm, (const char *)&vm->memory[path_ptr + 4]);
if (dev) {
if (dev->ops->open) {
vm->flag = dev->ops->open(dev->data, mode);
vm->stack[vm->sp++] = dev->handle;
} else {
vm->flag = 1; /* success, no open needed */
}
} else {
vm->flag = 0; /* error */
}
return true;
}
case SYSCALL_DEVICE_READ: {
Device *dev;
u32 handle = vm->stack[--vm->sp]; /* path pointer */
u32 size = vm->stack[--vm->sp]; /* size */
u32 buffer_ptr = vm->stack[--vm->sp];
dev = &vm->devices[handle];
if (dev && dev->ops->read) {
vm->flag = dev->ops->read(dev->data, &vm->memory[buffer_ptr + 4], size);
vm->stack[vm->sp++] = buffer_ptr;
} else {
vm->flag = 0;
}
return true;
}
case SYSCALL_DEVICE_WRITE: {
Device *dev;
u32 handle = vm->stack[--vm->sp]; /* path pointer */
u32 size = vm->stack[--vm->sp]; /* size */
u32 buffer_ptr = vm->stack[--vm->sp]; /* buffer pointer */
dev = &vm->devices[handle];
if (dev && dev->ops->write) {
vm->flag = dev->ops->write(
dev->data, (const u8 *)&vm->memory[buffer_ptr + 4], size);
} else {
vm->flag = 0;
}
return true;
}
case SYSCALL_DEVICE_CLOSE: {
Device *dev;
u32 handle = vm->stack[--vm->sp]; /* path pointer */
dev = &vm->devices[handle];
if (dev && dev->ops->close) {
i32 result = dev->ops->close(dev->data);
vm->flag = result;
} else {
vm->flag = 0;
}
return true;
}
case SYSCALL_DEVICE_IOCTL: {
Device *dev;
u32 handle = vm->stack[--vm->sp]; /* device path */
u32 cmd = vm->stack[--vm->sp]; /* ioctl command */
u32 args_ptr = vm->stack[--vm->sp]; /* args pointer */
dev = &vm->devices[handle];
if (dev && dev->ops && dev->ops->ioctl) {
i32 result = dev->ops->ioctl(dev->data, cmd, &vm->memory[args_ptr]);
vm->flag = result;
} else {
vm->flag = 0; /* error or no ioctl support */
}
return true;
}
case SYSCALL_EXIT: {
return false;
}
default: {
vm->flag = 0; /* unknown syscall */
return true;
}
}
return true;
}
case OP_SLL:
BIT_OP(<<);
case OP_SRL:
BIT_OP(>>);
case OP_SRE:
MATH_OP(i32, >>);
case OP_BAND:
BIT_OP(&);
case OP_BOR:
BIT_OP(|);
case OP_BXOR:
BIT_OP(^);
case OP_ADD_INT:
MATH_OP(i32, +);
case OP_SUB_INT:
MATH_OP(i32, -);
case OP_MUL_INT:
MATH_OP(i32, *);
case OP_DIV_INT:
MATH_OP(i32, /);
case OP_ADD_UINT:
MATH_OP(u32, +);
case OP_SUB_UINT:
MATH_OP(u32, -);
case OP_MUL_UINT:
MATH_OP(u32, *);
case OP_DIV_UINT:
MATH_OP(u32, /);
case OP_MUL_REAL: {
u32 a = vm->stack[--vm->sp];
u32 b = (vm->stack[--vm->sp] >> 16);
vm->stack[vm->sp++] = a * b;
return true;
}
case OP_DIV_REAL: {
u32 a = vm->stack[--vm->sp] << 16;
u32 b = vm->stack[--vm->sp];
vm->stack[vm->sp++] = a / b;
return true;
}
case OP_ADD_REAL: {
u32 a = vm->stack[--vm->sp];
u32 b = vm->stack[--vm->sp];
vm->stack[vm->sp++] = a + b;
return true;
}
case OP_SUB_REAL: {
u32 a = vm->stack[--vm->sp];
u32 b = vm->stack[--vm->sp];
vm->stack[vm->sp++] = a - b;
return true;
}
case OP_REAL_TO_INT: {
i32 value = vm->stack[--vm->sp];
if (value >= 0) {
vm->stack[vm->sp++] = value >> 16;
} else {
vm->stack[vm->sp++] = -((-value) >> 16);
}
return true;
}
case OP_INT_TO_REAL: {
i32 value = (vm->stack[--vm->sp] << 16);
vm->stack[vm->sp++] = value;
return true;
}
case OP_REAL_TO_UINT: {
i32 value = vm->stack[--vm->sp];
if (value < 0) {
vm->stack[vm->sp++] = 0;
} else {
vm->stack[vm->sp++] = AS_UINT(value >> 16);
}
return true;
}
case OP_UINT_TO_REAL: {
i32 value = AS_INT(vm->stack[--vm->sp] << 16);
vm->stack[vm->sp++] = value;
return true;
}
case OP_JEQ_UINT: {
COMPARE_AND_JUMP(u32, ==);
}
case OP_JNEQ_UINT: {
COMPARE_AND_JUMP(u32, !=);
}
case OP_JGT_UINT: {
COMPARE_AND_JUMP(u32, >);
}
case OP_JLT_UINT: {
COMPARE_AND_JUMP(u32, <);
}
case OP_JLE_UINT: {
COMPARE_AND_JUMP(u32, <=);
}
case OP_JGE_UINT: {
COMPARE_AND_JUMP(u32, >=);
}
case OP_JEQ_INT: {
COMPARE_AND_JUMP(i32, ==);
}
case OP_JNEQ_INT: {
COMPARE_AND_JUMP(i32, !=);
}
case OP_JGT_INT: {
COMPARE_AND_JUMP(i32, >);
}
case OP_JLT_INT: {
COMPARE_AND_JUMP(i32, <);
}
case OP_JLE_INT: {
COMPARE_AND_JUMP(i32, <=);
}
case OP_JGE_INT: {
COMPARE_AND_JUMP(i32, >=);
}
case OP_JEQ_REAL: {
COMPARE_AND_JUMP(i32, ==);
}
case OP_JNEQ_REAL: {
COMPARE_AND_JUMP(i32, !=);
}
case OP_JGT_REAL: {
COMPARE_AND_JUMP(i32, >);
}
case OP_JLT_REAL: {
COMPARE_AND_JUMP(i32, <);
}
case OP_JGE_REAL: {
COMPARE_AND_JUMP(i32, >=);
}
case OP_JLE_REAL: {
COMPARE_AND_JUMP(i32, <=);
}
case OP_INT_TO_STRING: {
char buffer[32];
int_to_string(AS_INT(vm->stack[--vm->sp]), buffer);
vm->stack[vm->sp++] = str_alloc(vm, frame, buffer, strlength(buffer));
return true;
}
case OP_UINT_TO_STRING: {
char buffer[32];
uint_to_string(vm->stack[--vm->sp], buffer);
vm->stack[vm->sp++] = str_alloc(vm, frame, buffer, strlength(buffer));
return true;
}
case OP_REAL_TO_STRING: {
char buffer[32];
fixed_to_string(AS_INT(vm->stack[--vm->sp]), buffer);
vm->stack[vm->sp++] = str_alloc(
vm, frame, buffer, strlength(buffer)); /* copy buffer to dest */
return true;
}
case OP_STRLEN: {
u32 ptr;
ptr = vm->stack[--vm->sp];
vm->stack[vm->sp++] = read_u32(vm, memory, ptr);
return true;
}
case OP_STRCAT: {
/* not implemented yet */
return false;
}
case OP_STR_GET_CHAR: {
/* not implemented yet */
return false;
}
case OP_STR_FIND_CHAR: {
/* not implemented yet */
return false;
}
case OP_STR_SLICE: {
/* not implemented yet */
return false;
}
case OP_STRING_TO_INT: {
/* not implemented yet */
return false;
}
case OP_STRING_TO_UINT: {
/* not implemented yet */
return false;
}
case OP_STRING_TO_REAL: {
/* not implemented yet */
return false;
}
}
return false; /* something bad happened */
}
Reference in New Issue View Git Blame Copy Permalink