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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Disassembly asserts for certain invalid PowerPC instructions"
href="https://llvm.org/bugs/show_bug.cgi?id=30507">30507</a>
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<th>Summary</th>
<td>Disassembly asserts for certain invalid PowerPC instructions
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>3.9
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Backend: PowerPC
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>njholcomb@wi.rr.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Calls to LLVMDisasmInstruction() with certain invalid PPC instructions fails
due to assertions instead of returning an error. Below are 4 asserts that were
hit, including example input bytes:
Input: fe 47 c0 0a
llvm/lib/Target/PowerPC/InstPrinter/PPCInstPrinter.cpp:256: void
llvm::PPCInstPrinter::printU1ImmOperand(const llvm::MCInst*, unsigned int,
llvm::raw_ostream&): Assertion `Value <= 1 && "Invalid u1imm argument!"'
failed.
Input: 12 d0 e2 0d
llvm/lib/Target/PowerPC/InstPrinter/PPCInstPrinter.cpp:277: void
llvm::PPCInstPrinter::printU4ImmOperand(const llvm::MCInst*, unsigned int,
llvm::raw_ostream&): Assertion `Value <= 15 && "Invalid u4imm argument!"'
failed.
Input: 7f 1f ce 5d
llvm/lib/Target/PowerPC/Disassembler/PPCDisassembler.cpp:210: DecodeStatus
decodeRegisterClass(llvm::MCInst&, uint64_t, const unsigned int (&)[N]) [with
long unsigned int N = 8ul; DecodeStatus = llvm::MCDisassembler::DecodeStatus;
uint64_t = long unsigned int]: Assertion `RegNo < N && "Invalid register
number"' failed.
Input: 7c 96 36 1d
llvm/include/llvm/MC/MCInst.h:75: int64_t llvm::MCOperand::getImm() const:
Assertion `isImm() && "This is not an immediate"' failed.</pre>
</div>
</p>
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