Would this include support for inline eBPF asm in C eBPF programs? That would be very nice for when new instructions are added to the kernel that have yet to be given a builtin in clang (such as the new BPF_END instructions). --Zvi On Wed, Aug 30, 2017 at 10:32 PM, Y Song <ys114321@xxxxxxxxx> wrote: > Jakub, > > Let me know if you need additional help on this. I think this > assembler->obj in llvm is the last > major piece for a complete toolchain for clang/llvm. > > Thanks, > > Yonghong > > On Wed, Aug 30, 2017 at 9:37 PM, Alexei Starovoitov > <alexei.starovoitov@xxxxxxxxx> wrote: >> On Wed, Aug 30, 2017 at 9:24 PM, Jakub Kicinski <kubakici@xxxxx> wrote: >>> >>>> llvm assembler is almost there too, but it needs some work. >>> >>> Does it use the "verifier instruction format"? Is it available >>> somewhere to look at? >> >> yes. you can use verifier instruction format. >> That was the goal for llvm to be as close as possible to >> kernel verifier syntax. >> But, I think, it's fine to deviate if it makes asm code easier to read. >> What is missing is AsmParser directory in >> llvm/lib/Target/BPF >> disassembler, elf tools, codegen are all there. >> Most of the core backend components are shared in the llvm, >> so it's only missing text parser. >> Most backends already have assemblers: >> ls -d lib/Target/*/AsmParser >> To make one for BPF requires a lot of copy-paste from others ;)
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