syscall: ensure openat uses variadic libc wrapper
On powerpc64le, this caused a failure in TestUnshareUidGidMapping
due to stack corruption which resulted in a bogus execve syscall.
Use the existing c wrapper to ensure we respect the ppc abi for
variadic functions.
Fixes https://gcc.gnu.org/PR98610
Change-Id: I29a7c8d8776bb50a9973b3e2794e5fafaf138caa
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/282717
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Cherry Zhang <cherryyz@google.com>
diff --git a/libgo/go/syscall/exec_linux.go b/libgo/go/syscall/exec_linux.go
index 3897581..0da6c96 100644
--- a/libgo/go/syscall/exec_linux.go
+++ b/libgo/go/syscall/exec_linux.go
@@ -20,7 +20,7 @@
//mount(source *byte, target *byte, fstype *byte, flags _C_long, data *byte) _C_int
//sysnb rawOpenat(dirfd int, pathname *byte, flags int, perm uint32) (fd int, err Errno)
-//openat(dirfd _C_int, pathname *byte, flags _C_int, perm Mode_t) _C_int
+//__go_openat(dirfd _C_int, pathname *byte, flags _C_int, perm Mode_t) _C_int
// SysProcIDMap holds Container ID to Host ID mappings used for User Namespaces in Linux.
// See user_namespaces(7).
