Brendan Shanks (@bshanks) commented about dlls/ntdll/unix/virtual.c:
- if (!pthread_get_register_pointer_values)
return 0;- kret = task_threads( mach_task_self(), &threads, &count );
- if (kret)
return 0;- for (i = 0; i < count; i++)
- {
uintptr_t reg_values[128];size_t reg_count = ARRAY_SIZE( reg_values );uintptr_t sp;kret = pthread_get_register_pointer_values( threads[i], &sp, ®_count, reg_values );if (kret)goto fail;
I tried this on macOS Monterey, both Intel and Apple Silicon (under Rosetta). It works correctly on Intel, but on Apple Silicon under Rosetta `thread_get_register_pointer_values` always fails with 0x10000003 (MACH_SEND_INVALID_DESTINATION) when querying Rosetta's exception handling thread, leading to the whole function failing.
The .NET code ignores errors from `thread_get_register_pointer_values` (other than `KERN_INSUFFICIENT_BUFFER_SIZE`) which allows this case to succeed, I think that would be the easiest fix.
(Rosetta's exception handling thread has the name 'com.apple.rosetta.exceptionserver' and is somewhat-hidden, for example it doesn't show up if you attach lldb to the process)