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    libbpf: add support for bpf_call · 48cca7e4
    Alexei Starovoitov 提交于
    - recognize relocation emitted by llvm
    - since all regular function will be kept in .text section and llvm
      takes care of pc-relative offsets in bpf_call instruction
      simply copy all of .text to relevant program section while adjusting
      bpf_call instructions in program section to point to newly copied
      body of instructions from .text
    - do so for all programs in the elf file
    - set all programs types to the one passed to bpf_prog_load()
    
    Note for elf files with multiple programs that use different
    functions in .text section we need to do 'linker' style logic.
    This work is still TBD
    Signed-off-by: NAlexei Starovoitov <ast@kernel.org>
    Acked-by: NDaniel Borkmann <daniel@iogearbox.net>
    Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
    48cca7e4
bpf.h 30.6 KB