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    Subject[PATCH 1/3] objtool: Write .orc_lookup section header
    Date
    The purpose of this patch is to set sh_type to SHT_PROGBITS and remove
    write bits away from sh_flags. In order to write section header, just
    call elf_create_section() upon section orc_lookup with 0 entry written.

    Originally, section headers are as follows:

    [23] .orc_unwind_ip PROGBITS ffffffff8259f4b8 0179f4b8
    0000000000178bbc 0000000000000000 A 0 0 1
    [24] .rela.orc_unwind_ RELA 0000000000000000 11e57b58
    00000000008d4668 0000000000000018 I 70 23 8
    [25] .orc_unwind PROGBITS ffffffff82718074 01918074
    000000000023519a 0000000000000000 A 0 0 1
    [26] .orc_lookup NOBITS ffffffff8294d210 01b4d20e
    0000000000030038 0000000000000000 WA 0 0 1
    [27] .vvar PROGBITS ffffffff8297e000 01b7e000
    0000000000001000 0000000000000000 WA 0 0 16

    Now, they are changed to:

    [23] .orc_unwind_ip PROGBITS ffffffff8259f4b8 0179f4b8
    0000000000178bbc 0000000000000000 A 0 0 1
    [24] .rela.orc_unwind_ RELA 0000000000000000 11e57b58
    00000000008d4668 0000000000000018 I 70 23 8
    [25] .orc_unwind PROGBITS ffffffff82718074 01918074
    000000000023519a 0000000000000000 A 0 0 1
    [26] .orc_lookup PROGBITS ffffffff8294d210 01b4d210
    0000000000030038 0000000000000000 A 0 0 1
    [27] .vvar PROGBITS ffffffff8297e000 01b7e000
    0000000000001000 0000000000000000 WA 0 0 16

    Signed-off-by: Huaixin Chang <changhuaixin@linux.alibaba.com>
    ---
    tools/objtool/orc_gen.c | 4 ++++
    1 file changed, 4 insertions(+)

    diff --git a/tools/objtool/orc_gen.c b/tools/objtool/orc_gen.c
    index 968f55e6dd94..2b2653979ad6 100644
    --- a/tools/objtool/orc_gen.c
    +++ b/tools/objtool/orc_gen.c
    @@ -189,6 +189,10 @@ int create_orc_sections(struct objtool_file *file)
    u_sec = elf_create_section(file->elf, ".orc_unwind",
    sizeof(struct orc_entry), idx);

    + /* make flags of section orc_lookup right */
    + if (!elf_create_section(file->elf, ".orc_lookup", sizeof(int), 0))
    + return -1;
    +
    /* populate sections */
    idx = 0;
    for_each_sec(file, sec) {
    --
    2.14.4.44.g2045bb6
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