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parse.c
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parse.c
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#include "vm.h"
v_info *parse(v_register *v_reg, int size)
{
v_info *info;
info = malloc(size * sizeof(v_info));
int idx = 0;
char v_code[16];
//skip inst byte
v_code[idx++] = *(char *)(v_reg->v_rip);
v_reg->v_rip++;
for (int i = 0; i < size; i++) {
// skip opX_meta byte
char meta = *(char *)(v_reg->v_rip);
v_code[idx++] = meta;
v_reg->v_rip++;
info[i].TYPE = (meta & 0xe0) >> 5;
info[i].SIGN = (meta & 0x18) >> 3;
info[i].REF = (meta & 0x4) >> 2;
info[i].SIZE = (meta & 0x3);
DEBUG("op%d_TYPE: %d\n", i, info[i].TYPE);
DEBUG("op%d_SIGN: %d\n", i, info[i].SIGN);
DEBUG("op%d_REF: %d\n", i, info[i].REF);
DEBUG("op%d_SIZE: %d\n", i, info[i].SIZE);
DEBUG("\n");
// immediate only
if (info[i].TYPE <= 2) {
int avail_size[] = {1, 3, 8};
int imm_size = avail_size[info[i].TYPE];
char imm[8] = {0};
strncpy(&v_code[idx], (char *)(v_reg->v_rip), imm_size);
strncpy(imm, (char *)(v_reg->v_rip), imm_size);
v_reg->v_rip += imm_size;
idx += imm_size;
info[i].operand = (long long)imm;
}
// reference
else if (info[i].REF) {
// first register
char reg = *(char *)(v_reg->v_rip);
v_code[idx++] = reg;
v_reg->v_rip++;
info[i].operand = (long long)v_reg;
int mul = 0;
if ((reg & 0xff) > 0x11) {
mul = (reg & 0xc0) >> 6;
reg &= 0x3f;
}
info[i].operand += reg * 8;
info[i].operand = *(long long *)(info[i].operand);
info[i].operand <<= mul;
// check second register
if (info[i].TYPE == 4 || info[i].TYPE == 7) {
long long tmp;
char reg = *(char *)(v_reg->v_rip);
v_code[idx++] = reg;
v_reg->v_rip++;
tmp = (long long)v_reg;
int mul = 0;
if ((reg & 0xff) > 0x11) {
mul = (reg & 0xc0) >> 6;
reg &= 0x3f;
}
tmp += reg * 8;
tmp = *(long long *)tmp;
tmp <<= mul;
if (info[i].SIGN & 0x2) {
info[i].operand -= tmp;
}
else {
info[i].operand += tmp;
}
}
// check immediate
if (info[i].TYPE == 5 || info[i].TYPE == 6) {
int avail_size[] = {1, 3};
int imm_size = avail_size[info[i].TYPE - 5];
char imm[8] = {0};
strncpy(&v_code[idx], (char *)(v_reg->v_rip), imm_size);
strncpy(imm, (char *)(v_reg->v_rip), imm_size);
v_reg->v_rip += imm_size;
idx += imm_size;
if (info[i].SIGN & 0x2) {
info[i].operand -= *(long long *)imm;
}
else {
info[i].operand += *(long long *)imm;
}
}
else if (info[i].TYPE == 7){
char imm[8] = {0};
strncpy(&v_code[idx], (char *)(v_reg->v_rip), 1);
strncpy(imm, (char *)(v_reg->v_rip), 1);
v_reg->v_rip++;
idx++;
if (info[i].SIGN & 0x1) {
info[i].operand -= *(long long *)imm;
}
else {
info[i].operand += *(long long *)imm;
}
}
}
// register only
else {
char reg = *(char *)(v_reg->v_rip);
v_code[idx++] = reg;
v_reg->v_rip++;
info[i].operand = (long long)v_reg;
info[i].operand += reg * 8;
}
}
// print v_code
for (int i = 0; i < idx; i++) {
DEBUG("0x%02x ", v_code[i] & 0xff);
}
DEBUG("\n");
return info;
}