v4.19.13 snapshot.
diff --git a/arch/m68k/include/asm/signal.h b/arch/m68k/include/asm/signal.h
new file mode 100644
index 0000000..8af85c3
--- /dev/null
+++ b/arch/m68k/include/asm/signal.h
@@ -0,0 +1,66 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _M68K_SIGNAL_H
+#define _M68K_SIGNAL_H
+
+#include <uapi/asm/signal.h>
+
+/* Most things should be clean enough to redefine this at will, if care
+ is taken to make libc match. */
+
+#define _NSIG 64
+#define _NSIG_BPW 32
+#define _NSIG_WORDS (_NSIG / _NSIG_BPW)
+
+typedef unsigned long old_sigset_t; /* at least 32 bits */
+
+typedef struct {
+ unsigned long sig[_NSIG_WORDS];
+} sigset_t;
+
+#define __ARCH_HAS_SA_RESTORER
+
+#include <asm/sigcontext.h>
+
+#ifndef CONFIG_CPU_HAS_NO_BITFIELDS
+#define __HAVE_ARCH_SIG_BITOPS
+
+static inline void sigaddset(sigset_t *set, int _sig)
+{
+ asm ("bfset %0{%1,#1}"
+ : "+o" (*set)
+ : "id" ((_sig - 1) ^ 31)
+ : "cc");
+}
+
+static inline void sigdelset(sigset_t *set, int _sig)
+{
+ asm ("bfclr %0{%1,#1}"
+ : "+o" (*set)
+ : "id" ((_sig - 1) ^ 31)
+ : "cc");
+}
+
+static inline int __const_sigismember(sigset_t *set, int _sig)
+{
+ unsigned long sig = _sig - 1;
+ return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW));
+}
+
+static inline int __gen_sigismember(sigset_t *set, int _sig)
+{
+ int ret;
+ asm ("bfextu %1{%2,#1},%0"
+ : "=d" (ret)
+ : "o" (*set), "id" ((_sig-1) ^ 31)
+ : "cc");
+ return ret;
+}
+
+#define sigismember(set,sig) \
+ (__builtin_constant_p(sig) ? \
+ __const_sigismember(set,sig) : \
+ __gen_sigismember(set,sig))
+
+#endif /* !CONFIG_CPU_HAS_NO_BITFIELDS */
+
+#endif /* _M68K_SIGNAL_H */