1 // Copyright 2019 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
4 
5 /*
6  * On AIX, call to _cgo_topofstack and Go main are forced to be a longcall.
7  * Without it, ld might add trampolines in the middle of .text section
8  * to reach these functions which are normally declared in runtime package.
9  */
10 extern int __attribute__((longcall)) __cgo_topofstack(void);
11 extern int __attribute__((longcall)) runtime_rt0_go(int argc, char **argv);
12 extern void __attribute__((longcall)) _rt0_ppc64_aix_lib(void);
13 
_cgo_topofstack(void)14 int _cgo_topofstack(void) {
15 	return __cgo_topofstack();
16 }
17 
main(int argc,char ** argv)18 int main(int argc, char **argv) {
19 	return runtime_rt0_go(argc, argv);
20 }
21 
22 static void libinit(void) __attribute__ ((constructor));
23 
24 /*
25  * libinit aims to replace .init_array section which isn't available on aix.
26  * Using __attribute__ ((constructor)) let gcc handles this instead of
27  * adding special code in cmd/link.
28  * However, it will be called for every Go programs which has cgo.
29  * Inside _rt0_ppc64_aix_lib(), runtime.isarchive is checked in order
30  * to know if this program is a c-archive or a simple cgo program.
31  * If it's not set, _rt0_ppc64_ax_lib() returns directly.
32  */
libinit()33 static void libinit() {
34 	_rt0_ppc64_aix_lib();
35 }
36