[Bug backtrace/23748] New: Can't single-step on bare-metal ARM targets

["jacereda at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=23748

            Bug ID: 23748
           Summary: Can't single-step on bare-metal ARM targets
           Product: gdb
           Version: HEAD
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: backtrace
          Assignee: unassigned at sourceware dot org
          Reporter: jacereda at gmail dot com
  Target Milestone: ---

I'm implementing a gdbserver for bare-metal ARM on Raspberry Pi.
Looks like arm-tdep.c doesn't install a single-step handler.
What's the rationale for such omission? 
Is it to avoid problems on ROM-based systems? 
Wouldn't the modified instruction write simply fail on those?
If anyone can provide some guidance as to what an acceptable solution should
look like, I'm willing to work on a patch.

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