v4.19.13 snapshot.
diff --git a/arch/s390/include/asm/syscall.h b/arch/s390/include/asm/syscall.h
new file mode 100644
index 0000000..96f9a91
--- /dev/null
+++ b/arch/s390/include/asm/syscall.h
@@ -0,0 +1,103 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Access to user system call parameters and results
+ *
+ * Copyright IBM Corp. 2008
+ * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
+ */
+
+#ifndef _ASM_SYSCALL_H
+#define _ASM_SYSCALL_H 1
+
+#include <uapi/linux/audit.h>
+#include <linux/sched.h>
+#include <linux/err.h>
+#include <asm/ptrace.h>
+
+/*
+ * The syscall table always contains 32 bit pointers since we know that the
+ * address of the function to be called is (way) below 4GB. So the "int"
+ * type here is what we want [need] for both 32 bit and 64 bit systems.
+ */
+extern const unsigned int sys_call_table[];
+extern const unsigned int sys_call_table_emu[];
+
+static inline long syscall_get_nr(struct task_struct *task,
+ struct pt_regs *regs)
+{
+ return test_pt_regs_flag(regs, PIF_SYSCALL) ?
+ (regs->int_code & 0xffff) : -1;
+}
+
+static inline void syscall_rollback(struct task_struct *task,
+ struct pt_regs *regs)
+{
+ regs->gprs[2] = regs->orig_gpr2;
+}
+
+static inline long syscall_get_error(struct task_struct *task,
+ struct pt_regs *regs)
+{
+ return IS_ERR_VALUE(regs->gprs[2]) ? regs->gprs[2] : 0;
+}
+
+static inline long syscall_get_return_value(struct task_struct *task,
+ struct pt_regs *regs)
+{
+ return regs->gprs[2];
+}
+
+static inline void syscall_set_return_value(struct task_struct *task,
+ struct pt_regs *regs,
+ int error, long val)
+{
+ regs->gprs[2] = error ? error : val;
+}
+
+static inline void syscall_get_arguments(struct task_struct *task,
+ struct pt_regs *regs,
+ unsigned int i, unsigned int n,
+ unsigned long *args)
+{
+ unsigned long mask = -1UL;
+
+ /*
+ * No arguments for this syscall, there's nothing to do.
+ */
+ if (!n)
+ return;
+
+ BUG_ON(i + n > 6);
+#ifdef CONFIG_COMPAT
+ if (test_tsk_thread_flag(task, TIF_31BIT))
+ mask = 0xffffffff;
+#endif
+ while (n-- > 0)
+ if (i + n > 0)
+ args[n] = regs->gprs[2 + i + n] & mask;
+ if (i == 0)
+ args[0] = regs->orig_gpr2 & mask;
+}
+
+static inline void syscall_set_arguments(struct task_struct *task,
+ struct pt_regs *regs,
+ unsigned int i, unsigned int n,
+ const unsigned long *args)
+{
+ BUG_ON(i + n > 6);
+ while (n-- > 0)
+ if (i + n > 0)
+ regs->gprs[2 + i + n] = args[n];
+ if (i == 0)
+ regs->orig_gpr2 = args[0];
+}
+
+static inline int syscall_get_arch(void)
+{
+#ifdef CONFIG_COMPAT
+ if (test_tsk_thread_flag(current, TIF_31BIT))
+ return AUDIT_ARCH_S390;
+#endif
+ return AUDIT_ARCH_S390X;
+}
+#endif /* _ASM_SYSCALL_H */