s390/uaccess: normalize order of parameters of indirect uaccess function calls

For some unknown reason the indirect uaccess functions on s390 implement a
different parameter order than what is usual.

e.g.:

unsigned long copy_to_user(void *to, const void *from, unsigned long n);
vs.
size_t (*copy_to_user)(size_t n, void __user * to, const void *from);

Let's get rid of this confusing parameter reordering.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/include/asm/uaccess.h

@@ -93,12 +93,12 @@ static inline unsigned long extable_fixup(const struct exception_table_entry *x)
 #define ARCH_HAS_SEARCH_EXTABLE
 
 struct uaccess_ops {
-	size_t (*copy_from_user)(size_t, const void __user *, void *);
+	size_t (*copy_from_user)(void *, const void __user *, size_t);
-	size_t (*copy_to_user)(size_t, void __user *, const void *);
+	size_t (*copy_to_user)(void __user *, const void *, size_t);
-	size_t (*copy_in_user)(size_t, void __user *, const void __user *);
+	size_t (*copy_in_user)(void __user *, const void __user *, size_t);
-	size_t (*clear_user)(size_t, void __user *);
+	size_t (*clear_user)(void __user *, size_t);
-	size_t (*strnlen_user)(size_t, const char __user *);
+	size_t (*strnlen_user)(const char __user *, size_t);
-	size_t (*strncpy_from_user)(size_t, const char __user *, char *);
+	size_t (*strncpy_from_user)(char *, const char __user *, size_t);
 	int (*futex_atomic_op)(int op, u32 __user *, int oparg, int *old);
 	int (*futex_atomic_cmpxchg)(u32 *, u32 __user *, u32 old, u32 new);
 };
@@ -109,15 +109,15 @@ extern struct uaccess_ops uaccess_pt;
 
 extern int __handle_fault(unsigned long, unsigned long, int);
 
-static inline int __put_user_fn(size_t size, void __user *ptr, void *x)
+static inline int __put_user_fn(void *x, void __user *ptr, size_t size)
 {
-	size = uaccess.copy_to_user(size, ptr, x);
+	size = uaccess.copy_to_user(ptr, x, size);
 	return size ? -EFAULT : size;
 }
 
-static inline int __get_user_fn(size_t size, const void __user *ptr, void *x)
+static inline int __get_user_fn(void *x, const void __user *ptr, size_t size)
 {
-	size = uaccess.copy_from_user(size, ptr, x);
+	size = uaccess.copy_from_user(x, ptr, size);
 	return size ? -EFAULT : size;
 }
 
@@ -135,8 +135,8 @@ static inline int __get_user_fn(size_t size, const void __user *ptr, void *x)
 	case 2:							\
 	case 4:							\
 	case 8:							\
-		__pu_err = __put_user_fn(sizeof (*(ptr)),	\
+		__pu_err = __put_user_fn(&__x, ptr,		\
-					 ptr, &__x);		\
+					 sizeof(*(ptr)));	\
 		break;						\
 	default:						\
 		__put_user_bad();				\
@@ -161,29 +161,29 @@ extern int __put_user_bad(void) __attribute__((noreturn));
 	switch (sizeof(*(ptr))) {				\
 	case 1: {						\
 		unsigned char __x;				\
-		__gu_err = __get_user_fn(sizeof (*(ptr)),	\
+		__gu_err = __get_user_fn(&__x, ptr,		\
-					 ptr, &__x);		\
+					 sizeof(*(ptr)));	\
 		(x) = *(__force __typeof__(*(ptr)) *) &__x;	\
 		break;						\
 	};							\
 	case 2: {						\
 		unsigned short __x;				\
-		__gu_err = __get_user_fn(sizeof (*(ptr)),	\
+		__gu_err = __get_user_fn(&__x, ptr,		\
-					 ptr, &__x);		\
+					 sizeof(*(ptr)));	\
 		(x) = *(__force __typeof__(*(ptr)) *) &__x;	\
 		break;						\
 	};							\
 	case 4: {						\
 		unsigned int __x;				\
-		__gu_err = __get_user_fn(sizeof (*(ptr)),	\
+		__gu_err = __get_user_fn(&__x, ptr,		\
-					 ptr, &__x);		\
+					 sizeof(*(ptr)));	\
 		(x) = *(__force __typeof__(*(ptr)) *) &__x;	\
 		break;						\
 	};							\
 	case 8: {						\
 		unsigned long long __x;				\
-		__gu_err = __get_user_fn(sizeof (*(ptr)),	\
+		__gu_err = __get_user_fn(&__x, ptr,		\
-					 ptr, &__x);		\
+					 sizeof(*(ptr)));	\
 		(x) = *(__force __typeof__(*(ptr)) *) &__x;	\
 		break;						\
 	};							\
@@ -222,7 +222,7 @@ extern int __get_user_bad(void) __attribute__((noreturn));
 static inline unsigned long __must_check
 __copy_to_user(void __user *to, const void *from, unsigned long n)
 {
-	return uaccess.copy_to_user(n, to, from);
+	return uaccess.copy_to_user(to, from, n);
 }
 
 #define __copy_to_user_inatomic __copy_to_user
@@ -268,7 +268,7 @@ copy_to_user(void __user *to, const void *from, unsigned long n)
 static inline unsigned long __must_check
 __copy_from_user(void *to, const void __user *from, unsigned long n)
 {
-	return uaccess.copy_from_user(n, from, to);
+	return uaccess.copy_from_user(to, from, n);
 }
 
 extern void copy_from_user_overflow(void)
@@ -309,7 +309,7 @@ copy_from_user(void *to, const void __user *from, unsigned long n)
 static inline unsigned long __must_check
 __copy_in_user(void __user *to, const void __user *from, unsigned long n)
 {
-	return uaccess.copy_in_user(n, to, from);
+	return uaccess.copy_in_user(to, from, n);
 }
 
 static inline unsigned long __must_check
@@ -326,14 +326,14 @@ static inline long __must_check
 strncpy_from_user(char *dst, const char __user *src, long count)
 {
 	might_fault();
-	return uaccess.strncpy_from_user(count, src, dst);
+	return uaccess.strncpy_from_user(dst, src, count);
 }
 
 static inline unsigned long
 strnlen_user(const char __user * src, unsigned long n)
 {
 	might_fault();
-	return uaccess.strnlen_user(n, src);
+	return uaccess.strnlen_user(src, n);
 }
 
 /**
@@ -359,14 +359,14 @@ strnlen_user(const char __user * src, unsigned long n)
 static inline unsigned long __must_check
 __clear_user(void __user *to, unsigned long n)
 {
-	return uaccess.clear_user(n, to);
+	return uaccess.clear_user(to, n);
 }
 
 static inline unsigned long __must_check
 clear_user(void __user *to, unsigned long n)
 {
 	might_fault();
-	return uaccess.clear_user(n, to);
+	return uaccess.clear_user(to, n);
 }
 
 extern int copy_to_user_real(void __user *dest, void *src, size_t count);

arch/s390/lib/uaccess_mvcos.c

@@ -26,7 +26,7 @@
 #define SLR	"slgr"
 #endif
 
-static size_t copy_from_user_mvcos(size_t size, const void __user *ptr, void *x)
+static size_t copy_from_user_mvcos(void *x, const void __user *ptr, size_t size)
 {
 	register unsigned long reg0 asm("0") = 0x81UL;
 	unsigned long tmp1, tmp2;
@@ -65,7 +65,7 @@ static size_t copy_from_user_mvcos(size_t size, const void __user *ptr, void *x)
 	return size;
 }
 
-static size_t copy_to_user_mvcos(size_t size, void __user *ptr, const void *x)
+static size_t copy_to_user_mvcos(void __user *ptr, const void *x, size_t size)
 {
 	register unsigned long reg0 asm("0") = 0x810000UL;
 	unsigned long tmp1, tmp2;
@@ -94,8 +94,8 @@ static size_t copy_to_user_mvcos(size_t size, void __user *ptr, const void *x)
 	return size;
 }
 
-static size_t copy_in_user_mvcos(size_t size, void __user *to,
+static size_t copy_in_user_mvcos(void __user *to, const void __user *from,
-				 const void __user *from)
+				 size_t size)
 {
 	register unsigned long reg0 asm("0") = 0x810081UL;
 	unsigned long tmp1, tmp2;
@@ -117,7 +117,7 @@ static size_t copy_in_user_mvcos(size_t size, void __user *to,
 	return size;
 }
 
-static size_t clear_user_mvcos(size_t size, void __user *to)
+static size_t clear_user_mvcos(void __user *to, size_t size)
 {
 	register unsigned long reg0 asm("0") = 0x810000UL;
 	unsigned long tmp1, tmp2;
@@ -145,7 +145,7 @@ static size_t clear_user_mvcos(size_t size, void __user *to)
 	return size;
 }
 
-static size_t strnlen_user_mvcos(size_t count, const char __user *src)
+static size_t strnlen_user_mvcos(const char __user *src, size_t count)
 {
 	size_t done, len, offset, len_str;
 	char buf[256];
@@ -155,7 +155,7 @@ static size_t strnlen_user_mvcos(size_t count, const char __user *src)
 		offset = (size_t)src & ~PAGE_MASK;
 		len = min(256UL, PAGE_SIZE - offset);
 		len = min(count - done, len);
-		if (copy_from_user_mvcos(len, src, buf))
+		if (copy_from_user_mvcos(buf, src, len))
 			return 0;
 		len_str = strnlen(buf, len);
 		done += len_str;
@@ -164,8 +164,8 @@ static size_t strnlen_user_mvcos(size_t count, const char __user *src)
 	return done + 1;
 }
 
-static size_t strncpy_from_user_mvcos(size_t count, const char __user *src,
+static size_t strncpy_from_user_mvcos(char *dst, const char __user *src,
-				      char *dst)
+				      size_t count)
 {
 	size_t done, len, offset, len_str;
 
@@ -175,7 +175,7 @@ static size_t strncpy_from_user_mvcos(size_t count, const char __user *src,
 	do {
 		offset = (size_t)src & ~PAGE_MASK;
 		len = min(count - done, PAGE_SIZE - offset);
-		if (copy_from_user_mvcos(len, src, dst))
+		if (copy_from_user_mvcos(dst, src, len))
 			return -EFAULT;
 		len_str = strnlen(dst, len);
 		done += len_str;

arch/s390/lib/uaccess_pt.c

@@ -22,7 +22,7 @@
 #define SLR	"slgr"
 #endif
 
-static size_t strnlen_kernel(size_t count, const char __user *src)
+static size_t strnlen_kernel(const char __user *src, size_t count)
 {
 	register unsigned long reg0 asm("0") = 0UL;
 	unsigned long tmp1, tmp2;
@@ -42,8 +42,8 @@ static size_t strnlen_kernel(size_t count, const char __user *src)
 	return count;
 }
 
-static size_t copy_in_kernel(size_t count, void __user *to,
+static size_t copy_in_kernel(void __user *to, const void __user *from,
-			     const void __user *from)
+			     size_t count)
 {
 	unsigned long tmp1;
 
@@ -211,26 +211,26 @@ fault:
 	return 0;
 }
 
-static size_t copy_from_user_pt(size_t n, const void __user *from, void *to)
+static size_t copy_from_user_pt(void *to, const void __user *from, size_t n)
 {
 	size_t rc;
 
 	if (segment_eq(get_fs(), KERNEL_DS))
-		return copy_in_kernel(n, (void __user *) to, from);
+		return copy_in_kernel((void __user *) to, from, n);
 	rc = __user_copy_pt((unsigned long) from, to, n, 0);
 	if (unlikely(rc))
 		memset(to + n - rc, 0, rc);
 	return rc;
 }
 
-static size_t copy_to_user_pt(size_t n, void __user *to, const void *from)
+static size_t copy_to_user_pt(void __user *to, const void *from, size_t n)
 {
 	if (segment_eq(get_fs(), KERNEL_DS))
-		return copy_in_kernel(n, to, (void __user *) from);
+		return copy_in_kernel(to, (void __user *) from, n);
 	return __user_copy_pt((unsigned long) to, (void *) from, n, 1);
 }
 
-static size_t clear_user_pt(size_t n, void __user *to)
+static size_t clear_user_pt(void __user *to, size_t n)
 {
 	void *zpage = (void *) empty_zero_page;
 	long done, size, ret;
@@ -242,7 +242,7 @@ static size_t clear_user_pt(size_t n, void __user *to)
 		else
 			size = n - done;
 		if (segment_eq(get_fs(), KERNEL_DS))
-			ret = copy_in_kernel(n, to, (void __user *) zpage);
+			ret = copy_in_kernel(to, (void __user *) zpage, n);
 		else
 			ret = __user_copy_pt((unsigned long) to, zpage, size, 1);
 		done += size;
@@ -253,7 +253,7 @@ static size_t clear_user_pt(size_t n, void __user *to)
 	return 0;
 }
 
-static size_t strnlen_user_pt(size_t count, const char __user *src)
+static size_t strnlen_user_pt(const char __user *src, size_t count)
 {
 	unsigned long uaddr = (unsigned long) src;
 	struct mm_struct *mm = current->mm;
@@ -263,7 +263,7 @@ static size_t strnlen_user_pt(size_t count, const char __user *src)
 	if (unlikely(!count))
 		return 0;
 	if (segment_eq(get_fs(), KERNEL_DS))
-		return strnlen_kernel(count, src);
+		return strnlen_kernel(src, count);
 	if (!mm)
 		return 0;
 	done = 0;
@@ -289,8 +289,8 @@ fault:
 	goto retry;
 }
 
-static size_t strncpy_from_user_pt(size_t count, const char __user *src,
+static size_t strncpy_from_user_pt(char *dst, const char __user *src,
-				   char *dst)
+				   size_t count)
 {
 	size_t done, len, offset, len_str;
 
@@ -301,7 +301,7 @@ static size_t strncpy_from_user_pt(size_t count, const char __user *src,
 		offset = (size_t)src & ~PAGE_MASK;
 		len = min(count - done, PAGE_SIZE - offset);
 		if (segment_eq(get_fs(), KERNEL_DS)) {
-			if (copy_in_kernel(len, (void __user *) dst, src))
+			if (copy_in_kernel((void __user *) dst, src, len))
 				return -EFAULT;
 		} else {
 			if (__user_copy_pt((unsigned long) src, dst, len, 0))
@@ -315,8 +315,8 @@ static size_t strncpy_from_user_pt(size_t count, const char __user *src,
 	return done;
 }
 
-static size_t copy_in_user_pt(size_t n, void __user *to,
+static size_t copy_in_user_pt(void __user *to, const void __user *from,
-			      const void __user *from)
+			      size_t n)
 {
 	struct mm_struct *mm = current->mm;
 	unsigned long offset_max, uaddr, done, size, error_code;
@@ -326,7 +326,7 @@ static size_t copy_in_user_pt(size_t n, void __user *to,
 	int write_user;
 
 	if (segment_eq(get_fs(), KERNEL_DS))
-		return copy_in_kernel(n, to, from);
+		return copy_in_kernel(to, from, n);
 	if (!mm)
 		return n;
 	done = 0;