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Add some basic signal support.

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It only works for sending a signal to a process that's in userspace code.

We implement reception by synthesizing a PUSHA+PUSHF in the receiving process
(operating on values in the TSS.)
The TSS CS:EIP is then rerouted to the signal handler and a tiny return
trampoline is constructed in a dedicated region in the receiving process.

Also hacked up /bin/kill to be able to send arbitrary signals (kill -N PID)
This commit is contained in:
Andreas Kling 2018-11-06 10:46:40 +01:00
parent 52d502e11f
commit 153ea704af
13 changed files with 240 additions and 30 deletions
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2
Kernel/MemoryManager.cpp
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@ -218,6 +218,8 @@ Region* MemoryManager::region_from_laddr(Process& process, LinearAddress laddr)
if (region->contains(laddr))
return region.ptr();
}
kprintf("%s(%u) Couldn't find region for L%x\n", process.name().characters(), process.pid(), laddr.get());
process.dumpRegions();
ASSERT_NOT_REACHED();
}