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Kernel: Map signal trampoline into each process's address space

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The signal trampoline was previously in kernelspace memory, but with
a special exception to make it user-accessible.

This patch moves it into each process's regular address space so we
can stop supporting user-allowed memory above 0xc0000000.
This commit is contained in:
Andreas Kling 2021-02-14 00:53:53 +01:00
parent 3551198f99
commit 1593219a41
4 changed files with 30 additions and 17 deletions
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2
Kernel/Thread.cpp
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@ -834,7 +834,7 @@ DispatchSignalResult Thread::dispatch_signal(u8 signal)
// valid (fork, exec etc) but the tss will, so we use that instead.
auto& regs = get_register_dump_from_stack();
setup_stack(regs);
regs.eip = g_return_to_ring3_from_signal_trampoline.get();
regs.eip = process.signal_trampoline().get();
#if SIGNAL_DEBUG
dbgln("signal: Thread in state '{}' has been primed with signal handler {:04x}:{:08x} to deliver {}", state_string(), m_tss.cs, m_tss.eip, signal);