Not sure if related and relevant, but I noted that OpenBSD defines FIX_SSTEP for alpha. #ifdef _KERNEL # define FIX_SSTEP(p) process_sstep(p, 0) #endif --- sys/arch/alpha/include/ptrace.h and additional logic in process_sstep() * process_sstep(proc) * Arrange for the process to trap after executing a single instruction. -- sys/arch/alpha/alpha/process_machdep.c
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