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    MIPS: Fix sigreturn via VDSO on microMIPS kernel · 13eb192d
    James Hogan 提交于
    In microMIPS kernels, handle_signal() sets the isa16 mode bit in the
    vdso address so that the sigreturn trampolines (which are offset from
    the VDSO) get executed as microMIPS.
    
    However commit ebb5e78c ("MIPS: Initial implementation of a VDSO")
    changed the offsets to come from the VDSO image, which already have the
    isa16 mode bit set correctly since they're extracted from the VDSO
    shared library symbol table.
    
    Drop the isa16 mode bit handling from handle_signal() to fix sigreturn
    for cores which support both microMIPS and normal MIPS. This doesn't fix
    microMIPS only cores, since the VDSO is still built for normal MIPS, but
    thats a separate problem.
    
    Fixes: ebb5e78c ("MIPS: Initial implementation of a VDSO")
    Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
    Cc: Paul Burton <paul.burton@imgtec.com>
    Cc: linux-mips@linux-mips.org
    Cc: <stable@vger.kernel.org> # 4.4.x-
    Patchwork: https://patchwork.linux-mips.org/patch/13348/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
    13eb192d
signal.c 21.9 KB