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compat32: Translate userland PT_* request values into kernel codes
Currently, the compat32 passes PT_* request values to kernel functions without translation. This works fine for low PT_* requests that happen to have the same values both on i386 and amd64. However, for requests higher than PT_SETFPREGS, the value passed from userland (matching i386 const) does not match the correct kernel (amd64) request. As a result, e.g. when compat32 process calls PT_GETDBREGS, kernel actually processes it as PT_SETSTEP. To resolve this, introduce support for compat32 PT_* request translation. The interface is based on PTRACE_TRANSLATE_REQUEST32 macro that is defined to a mapping function on architectures needing it. In case of amd64, this function maps userland i386 PT_* values into appropriate amd64 PT_* values. For the time being, the two additional PT_GETXMMREGS and PT_SETXMMREGS requests are unsupported due to lack of matching free amd64 constant.
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