tdep/1861: AIX 5.1 single_step configuration is broken

[hyc at symas dot com]

>Number:         1861
>Category:       tdep
>Synopsis:       AIX 5.1 single_step configuration is broken
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Feb 02 15:58:02 UTC 2005
>Closed-Date:
>Last-Modified:
>Originator:     hyc@symas.com
>Release:        6.3, 6.2.1
>Organization:
>Environment:
AIX 5.1, gcc 3.3.4
>Description:
Single stepping was not working, always getting "ptrace: an input or output error has occurred". Eventually found that gdb was issuing a PT_STEP request which is not supported on AIX. For some reason the code in rs6000-tdep.c was not enabling the software_single_step support. Just to get myself working again I changed the line
  if (from_xcoff_exec)
to 
  if (1 /*from_xcoff_exec*/)
to force the configuration in gdb/rs600-tdep.c:3305.

There really needs to be better detection for this case...
>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: