linux-kernel - 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

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Message-ID: <20150806065001.GA52262@Alexeis-MBP.westell.com>
Date:	Wed, 5 Aug 2015 23:50:02 -0700
From:	Alexei Starovoitov <alexei.starovoitov@...il.com>
To:	"Wangnan (F)" <wangnan0@...wei.com>
Cc:	He Kuang <hekuang@...wei.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	pi3orama <pi3orama@....com>, llvm-dev@...ts.llvm.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
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

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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