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Kernel: Update stored registers in a thread's tracer on SIGSTOP

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This is needed so we can retrieve the registers of a traced
thread that was attached to while it was running.

Attaching with ptrace to a running thread sends SIGSTOP to it.
This commit is contained in:
Itamar 2023-02-04 16:57:45 +02:00 • committed by Andreas Kling
parent 7544b35694
commit ddec9cb1f0
1 changed files with 2 additions and 0 deletions
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2
Kernel/Thread.cpp
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@ -958,6 +958,8 @@ DispatchSignalResult Thread::dispatch_signal(u8 signal)
auto* tracer = process.tracer();
if (signal == SIGSTOP || (tracer && default_signal_action(signal) == DefaultSignalAction::DumpCore)) {
dbgln_if(SIGNAL_DEBUG, "Signal {} stopping this thread", signal);
if (tracer)
tracer->set_regs(get_register_dump_from_stack());
set_state(Thread::State::Stopped, signal);
return DispatchSignalResult::Yield;
}