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gdbstub: add multiprocess support to 'H' and 'T' packets
Add a couple of helper functions to cope with GDB threads and processes. The gdb_get_process() function looks for a process given a pid. The gdb_get_cpu() function returns the CPU corresponding to the (pid, tid) pair given as parameters. The read_thread_id() function parses the thread-id sent by the peer. This function supports the multiprocess extension thread-id syntax. The return value specifies if the parsing failed, or if a special case was encountered (all processes or all threads). Use them in 'H' and 'T' packets handling to support the multiprocess extension. Signed-off-by: Luc Michel <luc.michel@greensocs.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> Acked-by: Alistair Francis <alistair.francis@wdc.com> Message-id: 20181207090135.7651-5-luc.michel@greensocs.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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