diff options
| author | Shengchen Kan <shengchen.kan@intel.com> | 2024-06-13 23:24:03 +0800 |
|---|---|---|
| committer | Shengchen Kan <shengchen.kan@intel.com> | 2024-06-13 23:26:33 +0800 |
| commit | 91a55cf5adbe37d33dc7b3b90de4bbb0b90761a1 (patch) | |
| tree | af9bfa363a95125e5e5eabd358d92be1f66184e9 /llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp | |
| parent | 525c25acd364f018b4fa55e941bd702587478b1c (diff) | |
| download | llvm-91a55cf5adbe37d33dc7b3b90de4bbb0b90761a1.zip llvm-91a55cf5adbe37d33dc7b3b90de4bbb0b90761a1.tar.gz llvm-91a55cf5adbe37d33dc7b3b90de4bbb0b90761a1.tar.bz2 | |
[X86][MC] Not decode 0xf3 as rep prefix if it's right before REX2
This fixes https://github.com/llvm/llvm-project/issues/95412
Diffstat (limited to 'llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp')
| -rw-r--r-- | llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp b/llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp index 0ff440b..6272e2d 100644 --- a/llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp +++ b/llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp @@ -284,7 +284,10 @@ static int readPrefixes(struct InternalInstruction *insn) { // it's not mandatory prefix // 3. if (nextByte >= 0x40 && nextByte <= 0x4f) it's REX and we need // 0x0f exactly after it to be mandatory prefix - if (isREX(insn, nextByte) || nextByte == 0x0f || nextByte == 0x66) + // 4. if (nextByte == 0xd5) it's REX2 and we need + // 0x0f exactly after it to be mandatory prefix + if (isREX(insn, nextByte) || isREX2(insn, nextByte) || nextByte == 0x0f || + nextByte == 0x66) // The last of 0xf2 /0xf3 is mandatory prefix insn->mandatoryPrefix = byte; insn->repeatPrefix = byte; |