From: nowhere@nospicedham.nevernet.at   
      
   On 19/11/2022 20:09, Paul Edwards wrote:   
   > I have implemented TF (trap flag) for the 8086.   
   >   
   > But when I looked up RBIL, it doesn't say that TF   
   > also works for the 80386. INT 1 is complicated   
   > instead.   
   >   
   > So can I single-step an 80386 program?   
   >   
   > It looks like x'cc' still works on an 80386, invoking   
   > INT 3 (from my reading of RBIL).   
   >   
   > Anyone know for sure?   
      
   yes, CC work on all x86.   
   but any decent debugger use Traps instead:   
   a) by setting TF to single step one instruction w/o   
       the need for replace/insert a byte there.   
   b) by setting breakpoints [DATA or CODE or I/O] to   
       trap at occurrence (reason for debug-registers).   
   note: CC work different to the avoidable CD03.   
   __   
   wolfgang   
      
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