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Kernel: Implement signal handling for x86_64

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This commit is contained in:
Gunnar Beutner 2021-06-29 10:31:25 +02:00 • committed by Andreas Kling
parent 36ce2a2b76
commit 6dde7dac8f
3 changed files with 72 additions and 9 deletions
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23
Kernel/Syscalls/sigaction.cpp
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@ -104,7 +104,28 @@ KResultOr<FlatPtr> Process::sys$sigreturn([[maybe_unused]] RegisterState& regist
registers.userspace_esp = registers.esp;
return smuggled_eax;
#else
PANIC("sys$sigreturn() not implemented.");
//Here, we restore the state pushed by dispatch signal and asm_signal_trampoline.
FlatPtr* stack_ptr = (FlatPtr*)registers.userspace_rsp;
FlatPtr smuggled_rax = *stack_ptr;
//pop the stored rax, rbp, return address, handler and signal code
stack_ptr += 5;
Thread::current()->m_signal_mask = *stack_ptr;
stack_ptr++;
//pop rdi, rsi, rbp, rsp, rbx, rdx, rcx, rax, r8, r9, r10, r11, r12, r13, r14 and r15
memcpy(&registers.rdi, stack_ptr, 16 * sizeof(FlatPtr));
stack_ptr += 16;
registers.rip = *stack_ptr;
stack_ptr++;
registers.rflags = (registers.rflags & ~safe_eflags_mask) | (*stack_ptr & safe_eflags_mask);
stack_ptr++;
registers.userspace_rsp = registers.rsp;
return smuggled_rax;
#endif
}