From 48d050ef7223ea59da377b1b8e8eb75c434bc255 Mon Sep 17 00:00:00 2001
From: Dmitry Stogov <dmitry@zend.com>
Date: Tue, 21 Sep 2021 14:30:56 +0300
Subject: [PATCH] JIT: Disable recursive call optimization for VM without
 global register variables

A tail-call to VM handler from recursively called function may lead to
pass control to incorrect stack frame.
---
 ext/opcache/jit/zend_jit_x86.dasc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ext/opcache/jit/zend_jit_x86.dasc b/ext/opcache/jit/zend_jit_x86.dasc
index 9c3e77a56a8..98670b26c0c 100644
--- a/ext/opcache/jit/zend_jit_x86.dasc
+++ b/ext/opcache/jit/zend_jit_x86.dasc
@@ -10082,7 +10082,7 @@ static int zend_jit_do_fcall(dasm_State **Dst, const zend_op *opline, const zend
 						}
 					}
 
-					if (!trace && op_array == &func->op_array
+					if (GCC_GLOBAL_REGS && !trace && op_array == &func->op_array
 							&& num_args >= op_array->required_num_args) {
 						/* recursive call */
 						if (ZEND_OBSERVER_ENABLED) {