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Kernel+LibC: Implement sigaltstack()

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This is required for compiling wine for serenity
This commit is contained in:
Idan Horowitz 2021-10-28 23:33:41 +03:00
parent d5d0eb45bf
commit f415218afe
9 changed files with 229 additions and 2 deletions
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22
Kernel/Thread.cpp
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@ -802,6 +802,17 @@ bool Thread::has_signal_handler(u8 signal) const
return !action.handler_or_sigaction.is_null();
}
bool Thread::has_alternative_signal_stack() const
{
return m_alternative_signal_stack_size != 0;
}
bool Thread::is_in_alternative_signal_stack() const
{
auto sp = get_register_dump_from_stack().userspace_sp();
return sp >= m_alternative_signal_stack && sp < m_alternative_signal_stack + m_alternative_signal_stack_size;
}
static void push_value_on_user_stack(FlatPtr& stack, FlatPtr data)
{
stack -= sizeof(FlatPtr);
@ -923,9 +934,16 @@ DispatchSignalResult Thread::dispatch_signal(u8 signal)
m_signal_mask |= new_signal_mask;
m_have_any_unmasked_pending_signals.store((m_pending_signals & ~m_signal_mask) != 0, AK::memory_order_release);
bool use_alternative_stack = ((action.flags & SA_ONSTACK) != 0) && has_alternative_signal_stack() && !is_in_alternative_signal_stack();
auto setup_stack = [&](RegisterState& state) {
FlatPtr stack = state.userspace_sp();
FlatPtr old_sp = stack;
FlatPtr old_sp = state.userspace_sp();
FlatPtr stack;
if (use_alternative_stack)
stack = m_alternative_signal_stack + m_alternative_signal_stack_size;
else
stack = old_sp;
FlatPtr ret_ip = state.ip();
FlatPtr ret_flags = state.flags();