Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 189 insertions, 0 deletions

diff --git a/arch/nios2/include/asm/uaccess.h b/arch/nios2/include/asm/uaccess.h
new file mode 100644
index 000000000..b8299082a
--- /dev/null
+++ b/arch/nios2/include/asm/uaccess.h
@@ -0,0 +1,189 @@
+/*
+ * User space memory access functions for Nios II
+ *
+ * Copyright (C) 2010-2011, Tobias Klauser <tklauser@distanz.ch>
+ * Copyright (C) 2009, Wind River Systems Inc
+ *   Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#ifndef _ASM_NIOS2_UACCESS_H
+#define _ASM_NIOS2_UACCESS_H
+
+#include <linux/string.h>
+
+#include <asm/page.h>
+
+#include <asm/extable.h>
+#include <asm-generic/access_ok.h>
+
+# define __EX_TABLE_SECTION	".section __ex_table,\"a\"\n"
+
+/*
+ * Zero Userspace
+ */
+
+static inline unsigned long __must_check __clear_user(void __user *to,
+						      unsigned long n)
+{
+	__asm__ __volatile__ (
+		"1:     stb     zero, 0(%1)\n"
+		"       addi    %0, %0, -1\n"
+		"       addi    %1, %1, 1\n"
+		"       bne     %0, zero, 1b\n"
+		"2:\n"
+		__EX_TABLE_SECTION
+		".word  1b, 2b\n"
+		".previous\n"
+		: "=r" (n), "=r" (to)
+		: "0" (n), "1" (to)
+	);
+
+	return n;
+}
+
+static inline unsigned long __must_check clear_user(void __user *to,
+						    unsigned long n)
+{
+	if (!access_ok(to, n))
+		return n;
+	return __clear_user(to, n);
+}
+
+extern unsigned long
+raw_copy_from_user(void *to, const void __user *from, unsigned long n);
+extern unsigned long
+raw_copy_to_user(void __user *to, const void *from, unsigned long n);
+#define INLINE_COPY_FROM_USER
+#define INLINE_COPY_TO_USER
+
+extern long strncpy_from_user(char *__to, const char __user *__from,
+			      long __len);
+extern __must_check long strnlen_user(const char __user *s, long n);
+
+/* Optimized macros */
+#define __get_user_asm(val, insn, addr, err)				\
+{									\
+	unsigned long __gu_val;						\
+	__asm__ __volatile__(						\
+	"       movi    %0, %3\n"					\
+	"1:   " insn " %1, 0(%2)\n"					\
+	"       movi     %0, 0\n"					\
+	"2:\n"								\
+	"       .section __ex_table,\"a\"\n"				\
+	"       .word 1b, 2b\n"						\
+	"       .previous"						\
+	: "=&r" (err), "=r" (__gu_val)					\
+	: "r" (addr), "i" (-EFAULT));					\
+	val = (__force __typeof__(*(addr)))__gu_val;			\
+}
+
+extern void __get_user_unknown(void);
+
+#define __get_user_8(val, ptr, err) do {				\
+	u64 __val = 0;							\
+	err = 0;							\
+	if (raw_copy_from_user(&(__val), ptr, sizeof(val))) {		\
+		err = -EFAULT;						\
+	} else {							\
+		val = (typeof(val))(typeof((val) - (val)))__val;	\
+	}								\
+	} while (0)
+
+#define __get_user_common(val, size, ptr, err)				\
+do {									\
+	switch (size) {							\
+	case 1:								\
+		__get_user_asm(val, "ldbu", ptr, err);			\
+		break;							\
+	case 2:								\
+		__get_user_asm(val, "ldhu", ptr, err);			\
+		break;							\
+	case 4:								\
+		__get_user_asm(val, "ldw", ptr, err);			\
+		break;							\
+	case 8:								\
+		__get_user_8(val, ptr, err);				\
+		break;							\
+	default:							\
+		__get_user_unknown();					\
+		break;							\
+	}								\
+} while (0)
+
+#define __get_user(x, ptr)						\
+	({								\
+	long __gu_err = -EFAULT;					\
+	const __typeof__(*(ptr)) __user *__gu_ptr = (ptr);		\
+	__get_user_common(x, sizeof(*(ptr)), __gu_ptr, __gu_err);	\
+	__gu_err;							\
+	})
+
+#define get_user(x, ptr)						\
+({									\
+	long __gu_err = -EFAULT;					\
+	const __typeof__(*(ptr)) __user *__gu_ptr = (ptr);		\
+	if (access_ok( __gu_ptr, sizeof(*__gu_ptr)))	\
+		__get_user_common(x, sizeof(*__gu_ptr),			\
+			__gu_ptr, __gu_err);				\
+	__gu_err;							\
+})
+
+#define __put_user_asm(val, insn, ptr, err)				\
+{									\
+	__asm__ __volatile__(						\
+	"       movi    %0, %3\n"					\
+	"1:   " insn " %1, 0(%2)\n"					\
+	"       movi     %0, 0\n"					\
+	"2:\n"								\
+	"       .section __ex_table,\"a\"\n"				\
+	"       .word 1b, 2b\n"						\
+	"       .previous\n"						\
+	: "=&r" (err)							\
+	: "r" (val), "r" (ptr), "i" (-EFAULT));				\
+}
+
+#define __put_user_common(__pu_val, __pu_ptr)				\
+({									\
+	long __pu_err = -EFAULT;					\
+	switch (sizeof(*__pu_ptr)) {					\
+	case 1:								\
+		__put_user_asm(__pu_val, "stb", __pu_ptr, __pu_err);	\
+		break;							\
+	case 2:								\
+		__put_user_asm(__pu_val, "sth", __pu_ptr, __pu_err);	\
+		break;							\
+	case 4:								\
+		__put_user_asm(__pu_val, "stw", __pu_ptr, __pu_err);	\
+		break;							\
+	default:							\
+		/* XXX: This looks wrong... */				\
+		__pu_err = 0;						\
+		if (__copy_to_user(__pu_ptr, &(__pu_val),		\
+			sizeof(*__pu_ptr)))				\
+			__pu_err = -EFAULT;				\
+		break;							\
+	}								\
+	__pu_err;							\
+})
+
+#define __put_user(x, ptr)						\
+({									\
+	__auto_type __pu_ptr = (ptr);					\
+	typeof(*__pu_ptr) __pu_val = (typeof(*__pu_ptr))(x);		\
+	__put_user_common(__pu_val, __pu_ptr);				\
+})
+
+#define put_user(x, ptr)						\
+({									\
+	__auto_type __pu_ptr = (ptr);					\
+	typeof(*__pu_ptr) __pu_val = (typeof(*__pu_ptr))(x);		\
+	access_ok(__pu_ptr, sizeof(*__pu_ptr)) ?			\
+		__put_user_common(__pu_val, __pu_ptr) :			\
+		-EFAULT;						\
+})
+
+#endif /* _ASM_NIOS2_UACCESS_H */