• Clemens Hammacher's avatar
    [Liftoff] Fix stack pointer corruption · cc862e69
    Clemens Hammacher authored
    During a C call, a previous value of the stack pointer is stored in a
    platform specific callee saved register. Loading the out argument of the
    C call might overwrite the value in that register, if the destination
    register collides with the platform specific register. Hence, do first
    use that register to restore the previous stack pointer, and only then
    load the out argument.
    Similarly, when pushing arguments to the stack, do first push all
    values and then set the platform specific register in order to avoid
    overwriting an argument value held in that register.
    
    Drive-by: Fix offset computations for parameters pushed to the stack
    for c calls.
    
    R=titzer@chromium.org
    
    Bug: chromium:820802,chromium:820896,chromium:820807,v8:6600
    Change-Id: If4567467b7912454f0bd2cad5927233c98894b03
    Reviewed-on: https://chromium-review.googlesource.com/959064Reviewed-by: 's avatarBen Titzer <titzer@chromium.org>
    Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#51916}
    cc862e69
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