From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 20:49:45 +0200
Subject: Adding upstream version 6.1.76.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 arch/powerpc/kernel/syscalls.c | 127 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100644 arch/powerpc/kernel/syscalls.c

(limited to 'arch/powerpc/kernel/syscalls.c')

diff --git a/arch/powerpc/kernel/syscalls.c b/arch/powerpc/kernel/syscalls.c
new file mode 100644
index 000000000..68ebb23a5
--- /dev/null
+++ b/arch/powerpc/kernel/syscalls.c
@@ -0,0 +1,127 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  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.
+ */
+
+#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>
+
+static long do_mmap2(unsigned long addr, size_t len,
+		     unsigned long prot, unsigned long flags,
+		     unsigned long fd, unsigned long off, int shift)
+{
+	if (!arch_validate_prot(prot, addr))
+		return -EINVAL;
+
+	if (!IS_ALIGNED(off, 1 << shift))
+		return -EINVAL;
+
+	return ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> shift);
+}
+
+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);
+}
+
+#ifdef CONFIG_COMPAT
+COMPAT_SYSCALL_DEFINE6(mmap2,
+		       unsigned long, addr, size_t, len,
+		       unsigned long, prot, unsigned long, flags,
+		       unsigned long, fd, unsigned long, off_4k)
+{
+	return do_mmap2(addr, len, prot, flags, fd, off_4k, PAGE_SHIFT-12);
+}
+#endif
+
+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_PPC64
+static long do_ppc64_personality(unsigned long personality)
+{
+	long ret;
+
+	if (personality(current->personality) == PER_LINUX32
+	    && personality(personality) == PER_LINUX)
+		personality = (personality & ~PER_MASK) | PER_LINUX32;
+	ret = ksys_personality(personality);
+	if (personality(ret) == PER_LINUX32)
+		ret = (ret & ~PER_MASK) | PER_LINUX;
+	return ret;
+}
+
+SYSCALL_DEFINE1(ppc64_personality, unsigned long, personality)
+{
+	return do_ppc64_personality(personality);
+}
+
+#ifdef CONFIG_COMPAT
+COMPAT_SYSCALL_DEFINE1(ppc64_personality, unsigned long, personality)
+{
+	return do_ppc64_personality(personality);
+}
+#endif /* CONFIG_COMPAT */
+#endif /* CONFIG_PPC64 */
+
+SYSCALL_DEFINE6(ppc_fadvise64_64,
+		int, fd, int, advice, u32, offset_high, u32, offset_low,
+		u32, len_high, u32, len_low)
+{
+	return ksys_fadvise64_64(fd, merge_64(offset_high, offset_low),
+				 merge_64(len_high, len_low), advice);
+}
+
+SYSCALL_DEFINE0(switch_endian)
+{
+	struct thread_info *ti;
+
+	regs_set_return_msr(current->thread.regs,
+				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;
+}
-- 
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