v4.19.13 snapshot.
diff --git a/arch/powerpc/kernel/syscalls.c b/arch/powerpc/kernel/syscalls.c
new file mode 100644
index 0000000..4662165
--- /dev/null
+++ b/arch/powerpc/kernel/syscalls.c
@@ -0,0 +1,141 @@
+/*
+ * Implementation of various system calls for Linux/PowerPC
+ *
+ * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
+ *
+ * Derived from "arch/i386/kernel/sys_i386.c"
+ * Adapted from the i386 version by Gary Thomas
+ * Modified by Cort Dougan (cort@cs.nmt.edu)
+ * and Paul Mackerras (paulus@cs.anu.edu.au).
+ *
+ * This file contains various random system calls that
+ * have a non-standard calling sequence on the Linux/PPC
+ * platform.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/syscalls.h>
+#include <linux/mm.h>
+#include <linux/fs.h>
+#include <linux/smp.h>
+#include <linux/sem.h>
+#include <linux/msg.h>
+#include <linux/shm.h>
+#include <linux/stat.h>
+#include <linux/mman.h>
+#include <linux/sys.h>
+#include <linux/ipc.h>
+#include <linux/utsname.h>
+#include <linux/file.h>
+#include <linux/personality.h>
+
+#include <linux/uaccess.h>
+#include <asm/syscalls.h>
+#include <asm/time.h>
+#include <asm/unistd.h>
+#include <asm/asm-prototypes.h>
+
+static inline long do_mmap2(unsigned long addr, size_t len,
+ unsigned long prot, unsigned long flags,
+ unsigned long fd, unsigned long off, int shift)
+{
+ long ret = -EINVAL;
+
+ if (!arch_validate_prot(prot, addr))
+ goto out;
+
+ if (shift) {
+ if (off & ((1 << shift) - 1))
+ goto out;
+ off >>= shift;
+ }
+
+ ret = ksys_mmap_pgoff(addr, len, prot, flags, fd, off);
+out:
+ return ret;
+}
+
+SYSCALL_DEFINE6(mmap2, unsigned long, addr, size_t, len,
+ unsigned long, prot, unsigned long, flags,
+ unsigned long, fd, unsigned long, pgoff)
+{
+ return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12);
+}
+
+SYSCALL_DEFINE6(mmap, unsigned long, addr, size_t, len,
+ unsigned long, prot, unsigned long, flags,
+ unsigned long, fd, off_t, offset)
+{
+ return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT);
+}
+
+#ifdef CONFIG_PPC32
+/*
+ * Due to some executables calling the wrong select we sometimes
+ * get wrong args. This determines how the args are being passed
+ * (a single ptr to them all args passed) then calls
+ * sys_select() with the appropriate args. -- Cort
+ */
+int
+ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct timeval __user *tvp)
+{
+ if ( (unsigned long)n >= 4096 )
+ {
+ unsigned long __user *buffer = (unsigned long __user *)n;
+ if (!access_ok(VERIFY_READ, buffer, 5*sizeof(unsigned long))
+ || __get_user(n, buffer)
+ || __get_user(inp, ((fd_set __user * __user *)(buffer+1)))
+ || __get_user(outp, ((fd_set __user * __user *)(buffer+2)))
+ || __get_user(exp, ((fd_set __user * __user *)(buffer+3)))
+ || __get_user(tvp, ((struct timeval __user * __user *)(buffer+4))))
+ return -EFAULT;
+ }
+ return sys_select(n, inp, outp, exp, tvp);
+}
+#endif
+
+#ifdef CONFIG_PPC64
+long ppc64_personality(unsigned long personality)
+{
+ long ret;
+
+ if (personality(current->personality) == PER_LINUX32
+ && personality(personality) == PER_LINUX)
+ personality = (personality & ~PER_MASK) | PER_LINUX32;
+ ret = sys_personality(personality);
+ if (personality(ret) == PER_LINUX32)
+ ret = (ret & ~PER_MASK) | PER_LINUX;
+ return ret;
+}
+#endif
+
+long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low,
+ u32 len_high, u32 len_low)
+{
+ return ksys_fadvise64_64(fd, (u64)offset_high << 32 | offset_low,
+ (u64)len_high << 32 | len_low, advice);
+}
+
+long sys_switch_endian(void)
+{
+ struct thread_info *ti;
+
+ current->thread.regs->msr ^= MSR_LE;
+
+ /*
+ * Set TIF_RESTOREALL so that r3 isn't clobbered on return to
+ * userspace. That also has the effect of restoring the non-volatile
+ * GPRs, so we saved them on the way in here.
+ */
+ ti = current_thread_info();
+ ti->flags |= _TIF_RESTOREALL;
+
+ return 0;
+}