add test for zend_vm_kind and fix unwinder

Author: henderkes

.github/workflows/test-suite.yml

@@ -989,6 +989,8 @@ jobs:
         uses: ./.github/actions/setup-windows
       - name: Build
         run: .github/scripts/windows/build.bat
+      - name: Verify ZEND_VM_KIND == ZEND_VM_KIND_TAILCALL
+        run: C:\obj\Release_TS\php.exe -r "if (ZEND_VM_KIND !== 'ZEND_VM_KIND_TAILCALL') { echo 'Expected ZEND_VM_KIND_TAILCALL, got ' . ZEND_VM_KIND . PHP_EOL; exit(1); }"
       - name: Test
         run: .github/scripts/windows/test.bat
   FREEBSD:

ext/opcache/jit/zend_jit_ir.c

@@ -3315,6 +3315,12 @@ static PRUNTIME_FUNCTION zend_jit_unwind_callback(DWORD64 pc, PVOID context)
 
 static void zend_jit_setup_unwinder(void)
 {
+#if ZEND_VM_KIND == ZEND_VM_KIND_TAILCALL
+	/* TAILCALL VM uses __preserve_none which changes the JIT prologue structure
+	 * (R12/R13 are pinned as ZREG_FP/ZREG_IP). The hardcoded unwind data for
+	 * CALL VM doesn't match, causing crashes during zend_bailout longjmp rom SEH */
+	return;
+#endif
 	/* Hardcoded SEH unwind data for JIT-ed PHP functions with "fixed stack frame" */
 	static const unsigned char uw_data[] = {
 		0x01, // UBYTE: 3 Version , UBYTE: 5 Flags