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UserspaceEmulator: Add support for UNIX signals :^)

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The emulator will now register signal handlers for all possible signals
and act as a translation layer between the kernel and the emulated
process.

To get an accurate simulation of signal handling, we duplicate the same
trampoline mechanism used by the kernel's signal delivery system, and
also use the "sigreturn" syscall to return from a signal handler.

Signal masking is not fully implemented yet, but this is pretty cool!
This commit is contained in:
Andreas Kling 2020-08-05 19:36:24 +02:00
parent ce95628b7f
commit 8dea25d974
3 changed files with 269 additions and 0 deletions
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7
DevTools/UserspaceEmulator/SoftCPU.h
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@ -241,6 +241,13 @@ public:
}
}
u32 eflags() const { return m_eflags; }
void set_eflags(ValueWithShadow<u32> eflags)
{
m_eflags = eflags.value();
m_flags_tainted = eflags.is_uninitialized();
}
ValueWithShadow<u32> eax() const { return const_gpr32(X86::RegisterEAX); }
ValueWithShadow<u32> ebx() const { return const_gpr32(X86::RegisterEBX); }
ValueWithShadow<u32> ecx() const { return const_gpr32(X86::RegisterECX); }