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Kernel: Implement signal handling for x86_64

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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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36
Kernel/Thread.cpp
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@ -822,7 +822,11 @@ DispatchSignalResult Thread::dispatch_signal(u8 signal)
dbgln_if(SIGNAL_DEBUG, "Setting up user stack to return to EIP {:p}, ESP {:p}", ret_eip, old_esp);
#elif ARCH(X86_64)
FlatPtr* stack = &state.userspace_rsp;
TODO();
FlatPtr old_rsp = *stack;
FlatPtr ret_rip = state.rip;
FlatPtr ret_rflags = state.rflags;
dbgln_if(SIGNAL_DEBUG, "Setting up user stack to return to RIP {:p}, RSP {:p}", ret_rip, old_rsp);
#endif
#if ARCH(I386)
@ -843,10 +847,32 @@ DispatchSignalResult Thread::dispatch_signal(u8 signal)
push_value_on_user_stack(stack, state.ebp);
push_value_on_user_stack(stack, state.esi);
push_value_on_user_stack(stack, state.edi);
#else
// FIXME
PANIC("Thread:dispatch_signal() not implemented");
// Align the stack to 16 bytes.
// Note that we push 176 bytes (8 * 22) on to the stack,
// so we need to account for this here.
FlatPtr stack_alignment = (*stack - 112) % 16;
*stack -= stack_alignment;
push_value_on_user_stack(stack, ret_rflags);
push_value_on_user_stack(stack, ret_rip);
push_value_on_user_stack(stack, state.r15);
push_value_on_user_stack(stack, state.r14);
push_value_on_user_stack(stack, state.r13);
push_value_on_user_stack(stack, state.r12);
push_value_on_user_stack(stack, state.r11);
push_value_on_user_stack(stack, state.r10);
push_value_on_user_stack(stack, state.r9);
push_value_on_user_stack(stack, state.r8);
push_value_on_user_stack(stack, state.rax);
push_value_on_user_stack(stack, state.rcx);
push_value_on_user_stack(stack, state.rdx);
push_value_on_user_stack(stack, state.rbx);
push_value_on_user_stack(stack, old_rsp);
push_value_on_user_stack(stack, state.rbp);
push_value_on_user_stack(stack, state.rsi);
push_value_on_user_stack(stack, state.rdi);
#endif
// PUSH old_signal_mask
@ -887,7 +913,7 @@ RegisterState& Thread::get_register_dump_from_stack()
// We should *always* have a trap. If we don't we're probably a kernel
// thread that hasn't been pre-empted. If we want to support this, we
// need to capture the registers probably into m_tss and return it
// need to capture the registers probably into m_regs and return it
VERIFY(trap);
while (trap) {