Could we do this slightly differently? SOFTWARE_SINGLE_STEP_P is used
in two non-platform-specific files: infptrace.c for a sanity check, and
infrun.c. In infrun, the only line which matters for this case is in
resume:
if (SOFTWARE_SINGLE_STEP_P () && step)
Why not add a hook to check there which lets the user use software
single step? It'll require playing with the target macros; we'd need
something like:
SOFTWARE_SINGLE_STEP - perform software single step
SOFTWARE_SINGLE_STEP_P - SOFTWARE_SINGLE_STEP available
SOFTWARE_SINGLE_STEP_ONLY_P - no hardware singlestep available
(check that in infptrace instead of SOFTWARE_SINGLE_STEP_P?)
I've wanted to flip back and forth at runtime before.