Adding upstream version 1.21.8.upstream/1.21.8

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 35 insertions, 0 deletions

diff --git a/src/runtime/cgo/gcc_aix_ppc64.c b/src/runtime/cgo/gcc_aix_ppc64.c
new file mode 100644
index 0000000..9dd9524
--- /dev/null
+++ b/src/runtime/cgo/gcc_aix_ppc64.c
@@ -0,0 +1,35 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+/*
+ * On AIX, call to _cgo_topofstack and Go main are forced to be a longcall.
+ * Without it, ld might add trampolines in the middle of .text section
+ * to reach these functions which are normally declared in runtime package.
+ */
+extern int __attribute__((longcall)) __cgo_topofstack(void);
+extern int __attribute__((longcall)) runtime_rt0_go(int argc, char **argv);
+extern void __attribute__((longcall)) _rt0_ppc64_aix_lib(void);
+
+int _cgo_topofstack(void) {
+	return __cgo_topofstack();
+}
+
+int main(int argc, char **argv) {
+	return runtime_rt0_go(argc, argv);
+}
+
+static void libinit(void) __attribute__ ((constructor));
+
+/*
+ * libinit aims to replace .init_array section which isn't available on aix.
+ * Using __attribute__ ((constructor)) let gcc handles this instead of
+ * adding special code in cmd/link.
+ * However, it will be called for every Go programs which has cgo.
+ * Inside _rt0_ppc64_aix_lib(), runtime.isarchive is checked in order
+ * to know if this program is a c-archive or a simple cgo program.
+ * If it's not set, _rt0_ppc64_ax_lib() returns directly.
+ */
+static void libinit() {
+	_rt0_ppc64_aix_lib();
+}