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Fix disp

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This commit is contained in:
Zoe Roux
2023-06-01 18:15:12 +09:00
parent 3b64aff81a
commit 222c1f0d1a
1 changed files with 10 additions and 5 deletions
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src/dasm.c
+10 -5
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@@ -20,15 +20,17 @@ void print_rm_operand(unsigned inst_size, u_int8_t *binary, bool is16bit)
return;
}
if (mod == 0 && rm == 0b110) {
printf("[%04x]", (binary[inst_size - 1] << 8) | binary[inst_size - 2]);
return;
}
if (mod == 0b10) {
snprintf(disp, sizeof(disp), "+%04x", binary[inst_size - 1] | (binary[inst_size - 2] << 8));
}
if (mod == 0 && rm == 0b110) {
snprintf(disp, sizeof(disp), "+%04x", (binary[inst_size - 1] << 8) | binary[inst_size - 2]);
}
if (mod == 0b01) {
int8_t disp_v = binary[inst_size - 1];
snprintf(disp, 20, "%c%x", disp_v < 0 ? '-' : '+', disp_v);
snprintf(disp, 20, "%c%x", disp_v < 0 ? '-' : '+', disp_v < 0 ? -disp_v : disp_v);
}
switch (rm)
@@ -106,11 +108,14 @@ instruction_t parse_inst(u_int8_t *binary, unsigned long size)
if (instructions[i].extended == -1)
return instructions[i];
if (size < 2)
if (size < 2) {
dprintf(2, "Invalid extended instruction.\n");
return invalid_instruction;
}
unsigned mod = (binary[1] & 0b111000) >> 3;
return extended[instructions[i].extended][mod];
}
dprintf(2, "Not implemented instruction: %x\n", *binary);
return invalid_instruction;
}