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Re: [llvm-dev] [LLVMdev] Cc llvmdev: Re: llvm bpf debug info. Re: [RFC PATCH v4 3/3] bpf: Introduce function for outputing data to perf event

From	Alexei Starovoitov <alexei.starovoitov@gmail.com>
Newsgroups	linux.kernel
Subject	Re: [llvm-dev] [LLVMdev] Cc llvmdev: Re: llvm bpf debug info. Re: [RFC PATCH v4 3/3] bpf: Introduce function for outputing data to perf event
Date	2015-08-06 09:00 +0200
Message-ID	<pUnjH-1ck-5@gated-at.bofh.it> (permalink)
References	(5 earlier) <pRw0b-4bi-19@gated-at.bofh.it> <pRDbj-66K-17@gated-at.bofh.it> <pU2Ij-4Ky-25@gated-at.bofh.it> <pUklP-54X-11@gated-at.bofh.it> <pUl8d-6gt-5@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Thu, Aug 06, 2015 at 12:31:26PM +0800, Wangnan (F) wrote:
> 
> 
> What about hacking ELF binary in memory?
> 
> 1. load the object into memory;
> 2. twist the machine code to EM_X86_64;
> 3. load it using elf_begin;
> 4. return the twested elf memory image using libdwfl's find_elf callback.
> 
> Then libdw will recognise BPF's object file as a X86_64 object file. If
> required,
> relocation sections can also be twisted in this way. Should not very hard
> since
> we can only consider one relocation type.
> 
> Then let's start thinking how to introduce EM_BPF. We can rely on the
> hacking
> until EM_BPF symbol reaches elfutils in perf.
> 
> What do you think?

sounds crazy, but may work. let's try it :)

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Re: [LLVMdev] Cc llvmdev: Re: llvm bpf debug info. Re: [RFC PATCH v4  3/3] bpf: Introduce function for outputing data to perf event He Kuang <hekuang@huawei.com> - 2015-08-05 11:00 +0200
  Re: [llvm-dev] [LLVMdev] Cc llvmdev: Re: llvm bpf debug info. Re:  [RFC PATCH v4 3/3] bpf: Introduce function for outputing data to perf event Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2015-08-06 05:50 +0200
    Re: [llvm-dev] [LLVMdev] Cc llvmdev: Re: llvm bpf debug info. Re:  [RFC PATCH v4 3/3] bpf: Introduce function for outputing data to perf event "Wangnan (F)" <wangnan0@huawei.com> - 2015-08-06 06:40 +0200
      Re: [llvm-dev] [LLVMdev] Cc llvmdev: Re: llvm bpf debug info. Re:  [RFC PATCH v4 3/3] bpf: Introduce function for outputing data to perf event Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2015-08-06 09:00 +0200

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