Add in arm specific sigaction implementation to fix sa_restorer

behavior so it works as expected

1 files changed, 40 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/arm/sigrestorer.S b/libc/sysdeps/linux/arm/sigrestorer.S
new file mode 100644
index 000000000..a90881eb0
--- /dev/null
+++ b/libc/sysdeps/linux/arm/sigrestorer.S
@@ -0,0 +1,40 @@
+/* Copyright (C) 1999 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <sys/syscall.h>
+
+/* If no SA_RESTORER function was specified by the application we use
+   one of these.  This avoids the need for the kernel to synthesise a return
+   instruction on the stack, which would involve expensive cache flushes. */
+
+.globl __default_sa_restorer;
+.type __default_sa_restorer,%function
+.align 4;
+__default_sa_restorer:
+	swi	__NR_sigreturn
+
+
+#ifdef __NR_rt_sigreturn
+
+.globl __default_rt_sa_restorer;
+.type __default_rt_sa_restorer,%function
+.align 4;
+__default_rt_sa_restorer:
+	swi	__NR_rt_sigreturn
+
+#endif