gdbstub: fix gdb_get_cpu(s, pid, tid) when pid and/or tid are 0
a TID or PID value means "any thread" (resp. "any process"). This commit fixes the different combinations when at least one value is 0. When both are 0, the function now returns the first attached CPU, instead of the CPU with TID 1, which is not necessarily attached or even existent. When PID is specified but TID is 0, the function returns the first CPU in the process, or NULL if the process does not exist or is not attached. In other cases, it returns the corresponding CPU, while ignoring the PID check when PID is 0. Reported-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NLuc Michel <luc.michel@greensocs.com> Reviewed-by: NPeter Maydell <peter.maydell@linaro.org> Message-id: 20190119140000.11767-1-luc.michel@greensocs.com Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
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