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<base href="http://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - AARCH64 asm("b %0":: "i" (&someFunc)) broken"
href="http://llvm.org/bugs/show_bug.cgi?id=22761">22761</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>AARCH64 asm("b %0":: "i" (&someFunc)) broken
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>3.6
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<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>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>axelheider@gmx.de
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Clang from LLVM release 3.5 and 3.6 crash for
asm("b %0":: s"i" (&someFunc))
when targeting AARCH64. It works find for AARCH32.
A minimal example is:
//------------------------------------------------------------------------------
__noreturn static void someFunc(void) { ... }
__naked __noreturn void entry64(void) { asm("b %0":: "i" (&someFunc)); }
//------------------------------------------------------------------------------
The error is this:
0 clang 0x0000000002442fd8 llvm::sys::PrintStackTrace(_IO_FILE*) +
40
1 clang 0x000000000244441b
2 libpthread.so.0 0x00002acc467be340
3 clang 0x000000000197ac8f
llvm::AArch64InstPrinter::getRegisterName(unsigned int, unsigned int) + 63
4 clang 0x00000000018c1b17
5 clang 0x0000000001e19488
llvm::AsmPrinter::EmitInlineAsm(llvm::MachineInstr const*) const + 2984
6 clang 0x0000000001e0f950 llvm::AsmPrinter::EmitFunctionBody() +
1344
7 clang 0x00000000018bfd72
8 clang 0x0000000001ec7093
llvm::MachineFunctionPass::runOnFunction(llvm::Function&) + 99
9 clang 0x00000000023dc3a7
llvm::FPPassManager::runOnFunction(llvm::Function&) + 311
10 clang 0x00000000023dc57b
llvm::FPPassManager::runOnModule(llvm::Module&) + 43
11 clang 0x00000000023dc98a
llvm::legacy::PassManagerImpl::run(llvm::Module&) + 794
12 clang 0x00000000008f004d
clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::CodeGenOptions
const&, clang::TargetOptions const&, clang::LangOptions const&,
llvm::StringRef, llvm::Module*, clang::BackendAction, llvm::raw_ostream*) +
7773
13 clang 0x00000000008e5efb
14 clang 0x0000000000a69c83 clang::ParseAST(clang::Sema&, bool, bool)
+ 483
15 clang 0x0000000000716829 clang::FrontendAction::Execute() + 57
16 clang 0x00000000006eb5b3
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 803
17 clang 0x00000000006d1a0b
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 2795
18 clang 0x00000000006c972e cc1_main(llvm::ArrayRef<char const*>,
char const*, void*) + 702
19 clang 0x00000000006d0732 main + 11506
20 libc.so.6 0x00002acc47411ec5 __libc_start_main + 245
21 clang 0x00000000006c93a1
Stack dump:
0. Program arguments: LLVM-V3.6/bin/clang -cc1 -triple aarch64-arm-none-eabi
-emit-obj -disable-free -disable-llvm-verifier -main-file-name test.c
-mrelocation-model static -mthread-model posix -mdisable-fp-elim -fmath-errno
-masm-verbose -mconstructor-aliases -fuse-init-array -target-cpu generic
-target-feature +neon -target-abi aapcs -target-linker-version 2.24 -g
-dwarf-column-info -ffunction-sections -fdata-sections -coverage-file test.c.o
-resource-dir /test/LLVM-V3.6/bin/../lib/clang/3.6.0 -I /test/inc -O3 -Werror
-Wmissing-include-dirs -std=gnu11 -fdebug-compilation-dir /test -ferror-limit
19 -fmessage-length 159 -ffreestanding -mstackrealign
-fallow-half-arguments-and-returns -fno-signed-char -fobjc-runtime=gcc
-fdiagnostics-show-option -vectorize-loops -vectorize-slp -o test.c.o -x c
test.c
1. <eof> parser at end of file
2. Code generation
3. Running pass 'Function Pass Manager' on module 'test.c'.
4. Running pass 'AArch64 Assembly Printer' on function '@someFunc'
clang: error: unable to execute command: Segmentation fault
clang: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 3.6.0 (tags/RELEASE_360/final)
Target: aarch64-arm-none-eabi
Thread model: posix</pre>
</div>
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