. restore state depends on how saving of state was done; also remember trap style in sig context . actually set and restore TRACEBIT with new trap styles; have to remove it once process enters kernel though, done in debug trap exception handler . introduce MF_STEP that makes arch-specific code turn on trace bit instead of setting TRACEBIT directly, a bit more arch-friendly and avoids keeping precious state in per-process PSW arch-dependently
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