if (consumeByte(insn, &byte))
return -1;
+
+ // If the the first byte is a LOCK prefix break and let it be disassembled
+ // as a lock "instruction", by creating an <MCInst #xxxx LOCK_PREFIX>.
+ // FIXME there is currently no way to get the disassembler to print the
+ // lock prefix if it is not the first byte.
+ if (insn->readerCursor - 1 == insn->startLocation && byte == 0xf0)
+ break;
switch (byte) {
case 0xf0: /* LOCK */
# CHECK: vpermil2ps $1, 4(%rax), %xmm2, %xmm3, %xmm0
0xc4 0xe3 0xe1 0x48 0x40 0x04 0x21
+
+# rdar://8812056 lldb doesn't print the x86 lock prefix when disassembling
+# CHECK: lock
+# CHECK: xaddq %rcx, %rbx
+0xf0 0x48 0x0f 0xc1 0xcb
return FILTER_STRONG;
- // Filter out artificial instructions
+ // Filter out artificial instructions but leave in the LOCK_PREFIX so it is
+ // printed as a separate "instruction".
if (Name.find("_Int") != Name.npos ||
Name.find("Int_") != Name.npos ||
Name.find("_NOREX") != Name.npos ||
- Name.find("2SDL") != Name.npos ||
- Name == "LOCK_PREFIX")
+ Name.find("2SDL") != Name.npos)
return FILTER_STRONG;
// Filter out instructions with segment override prefixes.