On Mon, 28 Sep 2020 at 21:15, Andrii Nakryiko <andrii.nakryiko@xxxxxxxxx> wrote: > > On Mon, Sep 28, 2020 at 8:41 PM Tony Ambardar <tony.ambardar@xxxxxxxxx> wrote: > > [...] > > I can provide 32-bit and 64-bit big-endian system images for running > > on QEMU's malta target. These are built using OpenWRT's build system > > and include a recent stable bpftool (v5.8.x) and v5.4.x kernel. Is > > that sufficient? It would work if manually creating raw or elf-based > > BTF files on a build host, then copying into the QEMU target to test > > parsing with bpftool (linked with the standard libbpf). > > That would be great! I intend to run them under qemu-system-arm and > supply latest kernel through -kernel option, so kernel itself is not > that critical. Same for bpftool, pahole, etc, I'll just supply them > from my host environment. So please let me know how I can get ahold of > those. Sample qemu invocation command line would be highly appreciated > as well. Thank you! > Sounds good. However, malta is actually a MIPS platform. I've been using it a long time because it makes things particularly easy to switch configuration between different word-sizes and endianness. I had some malta mips images ready to go, but if you need ARM I'll need to look into building images for big-endian ARM. Big-endian isn't so common in the wild, and I'll need to see if OpenWRT supports these, and how to configure with QEMU's 'armvirt' target if possible... > > > > For changes to the Linux build system itself (e.g. pahole endian > > options and target endian awareness), you would need to set up a > > I think that shouldn't be a problem and should be handled > transparently, even in a cross-compilation case, but let's see. > > > standard OpenWRT build environment. I can help with that, or simply > > integrate your patches myself for testing. As you say, nothing to be > > super pumped about... > > > > Let me know what's easiest and how best to get images to you. > > Any way you like and can. Dropbox, Google drive, what have you. > Meantime, I can package up what I have and send you the details. That would include images for mips32/64 big-endian and arm32/64 little-endian, plus usage examples. Is that still helpful for you? Thanks, Tony
