Implement fetching TLS TCB offset on MacOS

Tested with php-cgi and wordpress and 1255 for jit settings.

Closes GH-6659.

Author: devnexen

TSRM/TSRM.c

@@ -727,8 +727,10 @@ TSRM_API void *tsrm_get_ls_cache(void)
 TSRM_API size_t tsrm_get_ls_cache_tcb_offset(void)
 {/*{{{*/
 #if defined(__APPLE__) && defined(__x86_64__)
-    // TODO: Implement support for fast JIT ZTS code ???
-	return 0;
+	size_t ret;
+	asm ("movq __tsrm_ls_cache(%%rip),%0"
+          : "=r" (ret));
+	return ret;
 #elif defined(__x86_64__) && defined(__GNUC__)
 	size_t ret;
 

ext/opcache/jit/zend_jit_x86.dasc

@@ -2923,12 +2923,20 @@ static int zend_jit_setup(void)
 # elif defined(__APPLE__) && defined(__x86_64__)
 	tsrm_ls_cache_tcb_offset = tsrm_get_ls_cache_tcb_offset();
 	if (tsrm_ls_cache_tcb_offset == 0) {
+#if defined(__has_attribute) && __has_attribute(tls_model)
+		size_t ret;
+
+		asm ("movq __tsrm_ls_cache(%%rip),%0"
+			: "=r" (ret));
+		tsrm_ls_cache_tcb_offset = ret;
+#else
 		size_t *ti;
 		__asm__(
 			"leaq __tsrm_ls_cache(%%rip),%0"
 			: "=r" (ti));
 		tsrm_tls_offset = ti[2];
 		tsrm_tls_index = ti[1] * 8;
+#endif
 	}
 # elif defined(__GNUC__) && defined(__x86_64__)
 	tsrm_ls_cache_tcb_offset = tsrm_get_ls_cache_tcb_offset();