1 files changed, 133 insertions, 0 deletions
diff --git a/arch/mips/kernel/linux32.c b/arch/mips/kernel/linux32.c
new file mode 100644
index 0000000000..6b61be4863
--- /dev/null
+++ b/arch/mips/kernel/linux32.c
@@ -0,0 +1,133 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Conversion between 32-bit and 64-bit native system calls.
+ *
+ * Copyright (C) 2000 Silicon Graphics, Inc.
+ * Written by Ulf Carlsson (ulfc@engr.sgi.com)
+ */
+#include <linux/compiler.h>
+#include <linux/mm.h>
+#include <linux/errno.h>
+#include <linux/file.h>
+#include <linux/highuid.h>
+#include <linux/resource.h>
+#include <linux/highmem.h>
+#include <linux/time.h>
+#include <linux/times.h>
+#include <linux/poll.h>
+#include <linux/skbuff.h>
+#include <linux/filter.h>
+#include <linux/shm.h>
+#include <linux/sem.h>
+#include <linux/msg.h>
+#include <linux/icmpv6.h>
+#include <linux/syscalls.h>
+#include <linux/sysctl.h>
+#include <linux/utime.h>
+#include <linux/utsname.h>
+#include <linux/personality.h>
+#include <linux/dnotify.h>
+#include <linux/binfmts.h>
+#include <linux/security.h>
+#include <linux/compat.h>
+#include <linux/vfs.h>
+#include <linux/ipc.h>
+#include <linux/slab.h>
+
+#include <net/sock.h>
+#include <net/scm.h>
+
+#include <asm/compat-signal.h>
+#include <asm/sim.h>
+#include <linux/uaccess.h>
+#include <asm/mmu_context.h>
+#include <asm/mman.h>
+
+#ifdef __MIPSEB__
+#define merge_64(r1, r2) ((((r1) & 0xffffffffUL) << 32) + ((r2) & 0xffffffffUL))
+#endif
+#ifdef __MIPSEL__
+#define merge_64(r1, r2) ((((r2) & 0xffffffffUL) << 32) + ((r1) & 0xffffffffUL))
+#endif
+
+SYSCALL_DEFINE4(32_truncate64, const char __user *, path,
+	unsigned long, __dummy, unsigned long, a2, unsigned long, a3)
+{
+	return ksys_truncate(path, merge_64(a2, a3));
+}
+
+SYSCALL_DEFINE4(32_ftruncate64, unsigned long, fd, unsigned long, __dummy,
+	unsigned long, a2, unsigned long, a3)
+{
+	return ksys_ftruncate(fd, merge_64(a2, a3));
+}
+
+SYSCALL_DEFINE5(32_llseek, unsigned int, fd, unsigned int, offset_high,
+		unsigned int, offset_low, loff_t __user *, result,
+		unsigned int, origin)
+{
+	return sys_llseek(fd, offset_high, offset_low, result, origin);
+}
+
+/* From the Single Unix Spec: pread & pwrite act like lseek to pos + op +
+   lseek back to original location.  They fail just like lseek does on
+   non-seekable files.	*/
+
+SYSCALL_DEFINE6(32_pread, unsigned long, fd, char __user *, buf, size_t, count,
+	unsigned long, unused, unsigned long, a4, unsigned long, a5)
+{
+	return ksys_pread64(fd, buf, count, merge_64(a4, a5));
+}
+
+SYSCALL_DEFINE6(32_pwrite, unsigned int, fd, const char __user *, buf,
+	size_t, count, u32, unused, u64, a4, u64, a5)
+{
+	return ksys_pwrite64(fd, buf, count, merge_64(a4, a5));
+}
+
+SYSCALL_DEFINE1(32_personality, unsigned long, personality)
+{
+	unsigned int p = personality & 0xffffffff;
+	int ret;
+
+	if (personality(current->personality) == PER_LINUX32 &&
+	    personality(p) == PER_LINUX)
+		p = (p & ~PER_MASK) | PER_LINUX32;
+	ret = sys_personality(p);
+	if (ret != -1 && personality(ret) == PER_LINUX32)
+		ret = (ret & ~PER_MASK) | PER_LINUX;
+	return ret;
+}
+
+asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3,
+				   size_t count)
+{
+	return ksys_readahead(fd, merge_64(a2, a3), count);
+}
+
+asmlinkage long sys32_sync_file_range(int fd, int __pad,
+	unsigned long a2, unsigned long a3,
+	unsigned long a4, unsigned long a5,
+	int flags)
+{
+	return ksys_sync_file_range(fd,
+			merge_64(a2, a3), merge_64(a4, a5),
+			flags);
+}
+
+asmlinkage long sys32_fadvise64_64(int fd, int __pad,
+	unsigned long a2, unsigned long a3,
+	unsigned long a4, unsigned long a5,
+	int flags)
+{
+	return ksys_fadvise64_64(fd,
+			merge_64(a2, a3), merge_64(a4, a5),
+			flags);
+}
+
+asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2,
+	unsigned offset_a3, unsigned len_a4, unsigned len_a5)
+{
+	return ksys_fallocate(fd, mode, merge_64(offset_a2, offset_a3),
+			      merge_64(len_a4, len_a5));
+}