I found this description
[source]
/// In the Itanium and ARM ABIs, method pointers have the form:
/// struct { ptrdiff_t ptr; ptrdiff_t adj; } memptr;
///
/// In the Itanium ABI:
/// - method pointers are virtual if (memptr.ptr & 1) is nonzero
/// - the this-adjustment is (memptr.adj)
/// - the virtual offset is (memptr.ptr - 1)
///
/// In the ARM ABI:
/// - method pointers are virtual if (memptr.adj & 1) is nonzero
/// - the this-adjustment is (memptr.adj >> 1)
/// - the virtual offset is (memptr.ptr)
/// ARM uses 'adj' for the virtual flag because Thumb functions
/// may be only single-byte aligned.
///
/// If the member is virtual, the adjusted 'this' pointer points
/// to a vtable pointer from which the virtual offset is applied.
///
/// If the member is non-virtual, memptr.ptr is the address of
/// the function to call.
[/source]
in ItaniumCXXABI.cpp from the LLVM compiler source code. It shows how the method pointer should be constructed on arm64.
From the address you have I see that your ExceptionCallback is not a virtual method, so the baseOffset should be zero. Though your screenshots don't show the value of this member, I suspect it is not zero which is why the call causes the crash.
Reviewing my code for this scenario I believe I've found the problem. The macro MULTI_BASE_OFFSET(x) is not configured correctly on arm64. Instead of reading the offset at position 8 in the method pointer it reads it from position 4.
Try changing the declaration of the MULTI_BASE_OFFSET(x) in as_config.h (lines 606-610) to the following:
[source]
//#if !defined( __amd64__ )
// #define MULTI_BASE_OFFSET(x) (*((asDWORD*)(&x)+1))
//#else
// #define MULTI_BASE_OFFSET(x) (*((asQWORD*)(&x)+1))
//#endif
#define MULTI_BASE_OFFSET(x) (*((asPWORD*)(&x)+1))
[/source]
then recompile the AngelScript library.
Please let me know if this solves the problem and I'll check in the changes.
(note, I believe there are more changes needed to support virtual methods, but if you don't use them everything should work)
