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Kernel: Make dispatch_signal work for aarch64

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Timon Kruiper 2023-02-23 00:13:16 +01:00 committed by Idan Horowitz
parent 00df1fc060
commit e9b40863ab
Notes: sideshowbarker 2024-07-17 09:49:48 +09:00 
Author: https://github.com/FireFox317
Commit: https://github.com/SerenityOS/serenity/commit/e9b40863ab
Pull-request: https://github.com/SerenityOS/serenity/pull/18149
Reviewed-by: https://github.com/IdanHo ✅
1 changed files with 7 additions and 10 deletions
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17
Kernel/Thread.cpp
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@ -1115,23 +1115,20 @@ DispatchSignalResult Thread::dispatch_signal(u8 signal)
if (action.flags & SA_SIGINFO)
fill_signal_info_for_signal(signal_info);
#if ARCH(X86_64)
constexpr static FlatPtr thread_red_zone_size = 128;
#elif ARCH(AARCH64)
constexpr static FlatPtr thread_red_zone_size = 0; // FIXME
TODO_AARCH64();
#else
# error Unknown architecture in dispatch_signal
#endif
// Align the stack to 16 bytes.
// Note that we push some elements on to the stack before the return address,
// so we need to account for this here.
constexpr static FlatPtr elements_pushed_on_stack_before_handler_address = 1; // one slot for a saved register
FlatPtr const extra_bytes_pushed_on_stack_before_handler_address = sizeof(ucontext) + sizeof(signal_info);
FlatPtr stack_alignment = (stack - elements_pushed_on_stack_before_handler_address * sizeof(FlatPtr) + extra_bytes_pushed_on_stack_before_handler_address) % 16;
stack -= stack_alignment;
#if ARCH(X86_64)
// Also note that we have to skip the thread red-zone (if needed), so do that here.
stack -= thread_red_zone_size + stack_alignment;
constexpr static FlatPtr thread_red_zone_size = 128;
stack -= thread_red_zone_size;
#endif
auto start_of_stack = stack;
TRY(push_value_on_user_stack(stack, 0)); // syscall return value slot