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[sigh, I am testing my arm range stepping patches today...] On Thu, Sep 1, 2016 at 4:59 PM, Pedro Alves <palves@redhat.com> wrote: >>> >>>> I'm sorry I can't be more helpful at the moment but I wanted to post >>>> this issue before I have to leave for a while. >>> >>> Understood. Does enabling range stepping unblock something else? >> >> It would unblock ARM tracepoints, as per Yao's requirements... > > Tracepoints make gdbserver single-step and then not report the event > to gdb, so I do see the parallel with range-stepping. Throwing > while-stepping into the equation would make it even more clear. > Range-stepping makes gdbserver single-step and then not report the event to gdb if thread pc is within the range. It is similar to tracepoint, but much simpler. Both range-stepping and tracepoing needs to remove reinsert_breakpoint when gdbserver gets an event but doesn't report it back to gdb. However, gdbserver doesn't do so now. That is the reason I believe we need to support range-stepping first, and I am working on this (but interrupted by 7.12 release). The draft patch attached removes reinsert_breakpoint when gdbserver gets an event but not to report it back to gdb. Beside "removing reinsert_breakpoint on gdbserver internal event", we'd better to think that "each backend unwinders don't have to worry about unavailable data". I posted a draft here https://sourceware.org/ml/gdb-patches/2016-05/msg00060.html, I need some review comments. Pedro, can you take a look? This is not a hard requirement for ARM tracepoint support. -- Yao (齐尧)
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