Dear there, I wasn't able to generate obj file for bpf using llc: llc -march bpf -filetype=obj foo.bc Anyone knows what is the missing part in their backend? I want to make it work for my project. Thanks, Xiaochu -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20150802/e0b55467/attachment.html>
Alexei Starovoitov
2015-Aug-03 00:56 UTC
[LLVMdev] Unable to generate obj file using llc for bpf
On Sun, Aug 2, 2015 at 12:24 AM, Xiaochu Liu <xiaochu1122 at gmail.com> wrote:> Dear there, > > I wasn't able to generate obj file for bpf using llc: > > llc -march bpf -filetype=obj foo.bc > > Anyone knows what is the missing part in their backend? I want to make it > work for my project.what do you mean exactly? Is there some error message or foo.o is rejected by kernel?
Hi Alexei, I haven't tried to run code yet. The clang frontend can generate machine code for bpf but llc does not do the job. When i use : llc -march bpf -filetype=obj arith.bc It has this error message: Assertion failed: (isa<X>(Val) && "cast<Ty>() argument of incompatible type!"), function cast, file /Users/xil174/Experiments/vcore_tool/llvm/include/llvm/Support/Casting.h, line 237. 0 llc 0x00000001052318ce llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 46 1 llc 0x0000000105233199 PrintStackTraceSignalHandler(void*) + 25 2 llc 0x000000010522fe89 llvm::sys::RunSignalHandlers() + 425 3 llc 0x000000010523351e SignalHandler(int) + 366 4 libsystem_platform.dylib 0x00007fff8f363f1a _sigtramp + 26 5 llc 0x000000010566fb75 (anonymous namespace)::RewriteSymbols::ID + 40849 6 llc 0x00000001052331bb raise + 27 7 llc 0x0000000105233272 abort + 18 8 llc 0x0000000105233251 __assert_rtn + 129 9 llc 0x0000000104dd593e llvm::cast_retty<llvm::MCSectionMachO, llvm::MCSection*>::ret_type llvm::cast<llvm::MCSectionMachO, llvm::MCSection>(llvm::MCSection*) + 110 10 llc 0x0000000104dcecdb (anonymous namespace)::MCMachOStreamer::ChangeSection(llvm::MCSection*, llvm::MCExpr const*) + 75 11 llc 0x0000000104de9c2d llvm::MCStreamer::SwitchSection(llvm::MCSection*, llvm::MCExpr const*) + 797 12 llc 0x0000000104de5300 llvm::MCStreamer::InitSections(bool) + 80 13 llc 0x00000001044f02b6 llvm::AsmPrinter::doInitialization(llvm::Module&) + 182 14 llc 0x0000000104c5e683 llvm::FPPassManager::doInitialization(llvm::Module&) + 99 15 llc 0x0000000104c5ee65 (anonymous namespace)::MPPassManager::runOnModule(llvm::Module&) + 997 16 llc 0x0000000104c5e896 llvm::legacy::PassManagerImpl::run(llvm::Module&) + 310 17 llc 0x0000000104c5f771 llvm::legacy::PassManager::run(llvm::Module&) + 33 18 llc 0x0000000104279403 compileModule(char**, llvm::LLVMContext&) + 10755 19 llc 0x0000000104276996 main + 230 20 libdyld.dylib 0x00007fff907f25c9 start + 1 Stack dump: 0. Program arguments: ../build/Debug/bin/llc -march bpf -filetype=obj arith.bc Illegal instruction: 4 On Sun, Aug 2, 2015 at 5:57 PM Alexei Starovoitov < alexei.starovoitov at gmail.com> wrote:> On Sun, Aug 2, 2015 at 12:24 AM, Xiaochu Liu <xiaochu1122 at gmail.com> > wrote: > > Dear there, > > > > I wasn't able to generate obj file for bpf using llc: > > > > llc -march bpf -filetype=obj foo.bc > > > > Anyone knows what is the missing part in their backend? I want to make it > > work for my project. > > what do you mean exactly? > Is there some error message or foo.o is rejected by kernel? >-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20150803/ba3abf13/attachment.html>