Merge branch 'main' into xcode

code/asm/vm_x86_64.asm

@@ -28,13 +28,35 @@
 ; Call to compiled code after setting up the register environment for the VM
 ; prototype:
 ; uint8_t qvmcall64(int *programStack, int *opStack, intptr_t *instructionPointers, byte *dataBase);
+;
+; This call-stub has its own custom calling convention due to pushing all non-volatile registers
+; to the stack. The game uses set/longjmp which on Windows uses "RtlUnwindEx" to unwind the callstack.
+; This function cannot be unwound by default due to the custom calling convention.
+; To allow unwinding, we need to add custom SEH unwind data to the function.
 
-qvmcall64 PROC
-  push rsi							; push non-volatile registers to stack
+qvmcall64 PROC FRAME
+  push r12							; push all non-volatile registers to stack
+  .pushreg r12
+  push r13
+  .pushreg r13
+  push r14
+  .pushreg r14
+  push r15
+  .pushreg r15
   push rdi
+  .pushreg rdi
+  push rsi
+  .pushreg rsi
   push rbx
+  .pushreg rbx
+  push rbp
+  .pushreg rbp
+  
   ; need to save pointer in rcx so we can write back the programData value to caller
   push rcx
+  .pushreg rcx
+  
+  .endprolog						; custom unwind data ends here
 
   ; registers r8 and r9 have correct value already thanx to __fastcall
   xor rbx, rbx						; opStackOfs starts out being 0
@@ -48,9 +70,14 @@ qvmcall64 PROC
   mov dword ptr [rcx], esi			; write back the programStack value
   mov al, bl						; return opStack offset
 
+  pop rbp							; restore all non-volatile registers after the call
   pop rbx
-  pop rdi
   pop rsi
+  pop rdi
+  pop r15
+  pop r14
+  pop r13
+  pop r12
   
   ret
 qvmcall64 ENDP