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Attaching to the gdbstub of a running process requires stopping its threads. For threads that run on a CPU, cpu_exit() is enough, but the only way to grab attention of a thread that is stuck in a long-running syscall is to interrupt it with a signal. Reserve a host realtime signal for this, just like it's already done for TARGET_SIGABRT on Linux. This may reduce the number of available guest realtime signals by one, but this is acceptable, since there are quite a lot of them, and it's unlikely that there are apps that need them all. Set signal_pending for the safe_sycall machinery to prevent invoking the syscall. This is a lie, since we don't queue a guest signal, but process_pending_signals() can handle the absence of pending signals. The syscall returns with QEMU_ERESTARTSYS errno, which arranges for the automatic restart. This is important, because it helps avoiding disturbing poorly written guests. Reviewed-by: Warner Losh <imp@bsdimp.com> Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Message-Id: <20250117001542.8290-5-iii@linux.ibm.com> Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <20250207153112.3939799-14-alex.bennee@linaro.org> |
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| .. | ||
| abitypes.h | ||
| cpu_loop.h | ||
| guest-base.h | ||
| guest-host.h | ||
| page-protection.h | ||
| safe-syscall.h | ||
| signal.h | ||
| syscall-trace.h | ||
| thunk.h | ||
| tswap-target.h | ||