[PATCH 0/2] MR6777: ntdll: Add SIGSYS handler to support syscall emulation on macOS Sonoma and later.

[Brendan Shanks (＠bshanks)]

On macOS, valid syscall numbers all have a high bit set, leaving the low range "invalid" to be caught by SIGSYS.

On a Mac running macOS 14 or later, the test passes.
macOS 13 and earlier have a kernel bug which prevents SIGSYS from being delivered.

This patch was adapted from Apple's Game Porting Toolkit Wine patch, and from the 'ntdll-Syscall_Emulation' wine-staging patchset.

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https://gitlab.winehq.org/wine/wine/-/merge_requests/6777