• Matt Fleming's avatar
    sh: Delete DWARF_ARCH_UNWIND_OFFSET · f8264667
    Matt Fleming authored
    Trying to figure out the best value for DWARF_ARCH_UNWIND_OFFSET is
    tricky at best. Various things can change the size (and offset from the
    beginning of the function) of the prologue. Notably, turning on ftrace
    adds calls to mcount at the beginning of functions, thereby pushing the
    prologue further into the function.
    
    So replace DWARF_ARCH_UNWIND_OFFSET with some code that continues to
    execute CFA instructions until the value of return address register is
    defined. This is safe to do because we know that the return address must
    have been pushed onto the frame before our first function call; we just
    can't figure out where at compile-time.
    Signed-off-by: default avatarMatt Fleming <matt@console-pimps.org>
    Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
    f8264667
dwarf.h 9.37 KB