[LLVMbugs] [Bug 16065] New: Segfault when assembling "test [eax], dl" or "xchg ecx, [esi+0x7e]"

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Sat May 18 14:25:04 PDT 2013


            Bug ID: 16065
           Summary: Segfault when assembling "test [eax],dl" or "xchg
           Product: libraries
           Version: 3.2
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: MC
          Assignee: unassignedbugs at nondot.org
          Reporter: ysangkok at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

These commands crash llvm-mc:

echo "test [eax],dl" | llvm-mc-3.2 -triple i386 -x86-asm-syntax intel
echo "xchg ecx,[esi+0x7e]" | llvm-mc-3.2 -triple i386 -x86-asm-syntax intel

An error message.

Stack Trace:
0  libLLVM-3.2.so.1 0xb6f25898
1  libLLVM-3.2.so.1 0xb6f25f3c
2                   0xb76f3400 __kernel_sigreturn + 0
3  libLLVM-3.2.so.1 0xb6acb190 llvm::MCExpr::print(llvm::raw_ostream&) const +
4  libLLVM-3.2.so.1 0xb6ffabc6
llvm::X86ATTInstPrinter::printOperand(llvm::MCInst const*, unsigned int,
llvm::raw_ostream&) + 246
5  libLLVM-3.2.so.1 0xb6ffc587
llvm::X86ATTInstPrinter::printMemReference(llvm::MCInst const*, unsigned int,
llvm::raw_ostream&) + 551
6  libLLVM-3.2.so.1 0xb6ffc9d8
llvm::X86ATTInstPrinter::printInstruction(llvm::MCInst const*,
llvm::raw_ostream&) + 456
7  libLLVM-3.2.so.1 0xb6ffd7d0 llvm::X86ATTInstPrinter::printInst(llvm::MCInst
const*, llvm::raw_ostream&, llvm::StringRef) + 208
8  libLLVM-3.2.so.1 0xb6aaa5bb
9  libLLVM-3.2.so.1 0xb6ff963b
10 libLLVM-3.2.so.1 0xb6b108f3
11 libLLVM-3.2.so.1 0xb6b13deb
12 llvm-mc-3.2      0x0804c188
13 libc.so.6        0xb5eed935 __libc_start_main + 245
14 llvm-mc-3.2      0x0804caf9

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