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@@ -1,27 +1,424 @@
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-#ifndef _ASM_SCORE_UACCESS_H
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-#define _ASM_SCORE_UACCESS_H
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+#ifndef __SCORE_UACCESS_H
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+#define __SCORE_UACCESS_H
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+
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+#include <linux/kernel.h>
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+#include <linux/errno.h>
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+#include <linux/thread_info.h>
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+
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+#define VERIFY_READ 0
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+#define VERIFY_WRITE 1
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+
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+#define get_ds() (KERNEL_DS)
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+#define get_fs() (current_thread_info()->addr_limit)
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+#define segment_eq(a, b) ((a).seg == (b).seg)
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+
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/*
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- * Copyright (C) 2006 Atmark Techno, Inc.
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+ * Is a address valid? This does a straighforward calculation rather
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+ * than tests.
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+ *
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+ * Address valid if:
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+ * - "addr" doesn't have any high-bits set
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+ * - AND "size" doesn't have any high-bits set
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+ * - AND "addr+size" doesn't have any high-bits set
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+ * - OR we are in kernel mode.
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*
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- * This file is subject to the terms and conditions of the GNU General Public
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- * License. See the file "COPYING" in the main directory of this archive
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- * for more details.
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+ * __ua_size() is a trick to avoid runtime checking of positive constant
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+ * sizes; for those we already know at compile time that the size is ok.
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*/
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-struct pt_regs;
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-extern int fixup_exception(struct pt_regs *regs);
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+#define __ua_size(size) \
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+ ((__builtin_constant_p(size) && (signed long) (size) > 0) ? 0 : (size))
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+
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+/*
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+ * access_ok: - Checks if a user space pointer is valid
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+ * @type: Type of access: %VERIFY_READ or %VERIFY_WRITE. Note that
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+ * %VERIFY_WRITE is a superset of %VERIFY_READ - if it is safe
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+ * to write to a block, it is always safe to read from it.
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+ * @addr: User space pointer to start of block to check
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+ * @size: Size of block to check
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+ *
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+ * Context: User context only. This function may sleep.
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+ *
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+ * Checks if a pointer to a block of memory in user space is valid.
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+ *
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+ * Returns true (nonzero) if the memory block may be valid, false (zero)
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+ * if it is definitely invalid.
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+ *
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+ * Note that, depending on architecture, this function probably just
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+ * checks that the pointer is in the user space range - after calling
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+ * this function, memory access functions may still return -EFAULT.
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+ */
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+
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+#define __access_ok(addr, size) \
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+ (((long)((get_fs().seg) & \
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+ ((addr) | ((addr) + (size)) | \
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+ __ua_size(size)))) == 0)
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+
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+#define access_ok(type, addr, size) \
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+ likely(__access_ok((unsigned long)(addr), (size)))
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+
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+/*
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+ * put_user: - Write a simple value into user space.
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+ * @x: Value to copy to user space.
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+ * @ptr: Destination address, in user space.
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+ *
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+ * Context: User context only. This function may sleep.
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+ *
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+ * This macro copies a single simple value from kernel space to user
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+ * space. It supports simple types like char and int, but not larger
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+ * data types like structures or arrays.
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+ *
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+ * @ptr must have pointer-to-simple-variable type, and @x must be assignable
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+ * to the result of dereferencing @ptr.
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+ *
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+ * Returns zero on success, or -EFAULT on error.
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+ */
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+#define put_user(x, ptr) __put_user_check((x), (ptr), sizeof(*(ptr)))
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+
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+/*
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+ * get_user: - Get a simple variable from user space.
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+ * @x: Variable to store result.
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+ * @ptr: Source address, in user space.
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+ *
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+ * Context: User context only. This function may sleep.
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+ *
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+ * This macro copies a single simple variable from user space to kernel
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+ * space. It supports simple types like char and int, but not larger
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+ * data types like structures or arrays.
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+ *
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+ * @ptr must have pointer-to-simple-variable type, and the result of
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+ * dereferencing @ptr must be assignable to @x without a cast.
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+ *
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+ * Returns zero on success, or -EFAULT on error.
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+ * On error, the variable @x is set to zero.
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+ */
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+#define get_user(x, ptr) __get_user_check((x), (ptr), sizeof(*(ptr)))
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+
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+/*
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+ * __put_user: - Write a simple value into user space, with less checking.
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+ * @x: Value to copy to user space.
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+ * @ptr: Destination address, in user space.
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+ *
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+ * Context: User context only. This function may sleep.
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+ *
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+ * This macro copies a single simple value from kernel space to user
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+ * space. It supports simple types like char and int, but not larger
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+ * data types like structures or arrays.
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+ *
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+ * @ptr must have pointer-to-simple-variable type, and @x must be assignable
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+ * to the result of dereferencing @ptr.
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+ *
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+ * Caller must check the pointer with access_ok() before calling this
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+ * function.
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+ *
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+ * Returns zero on success, or -EFAULT on error.
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+ */
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+#define __put_user(x, ptr) __put_user_nocheck((x), (ptr), sizeof(*(ptr)))
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+
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+/*
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+ * __get_user: - Get a simple variable from user space, with less checking.
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+ * @x: Variable to store result.
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+ * @ptr: Source address, in user space.
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+ *
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+ * Context: User context only. This function may sleep.
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+ *
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+ * This macro copies a single simple variable from user space to kernel
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+ * space. It supports simple types like char and int, but not larger
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+ * data types like structures or arrays.
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+ *
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+ * @ptr must have pointer-to-simple-variable type, and the result of
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+ * dereferencing @ptr must be assignable to @x without a cast.
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+ *
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+ * Caller must check the pointer with access_ok() before calling this
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+ * function.
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+ *
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+ * Returns zero on success, or -EFAULT on error.
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+ * On error, the variable @x is set to zero.
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+ */
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+#define __get_user(x, ptr) __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
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+
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+struct __large_struct { unsigned long buf[100]; };
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+#define __m(x) (*(struct __large_struct __user *)(x))
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+
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+/*
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+ * Yuck. We need two variants, one for 64bit operation and one
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+ * for 32 bit mode and old iron.
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+ */
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+extern void __get_user_unknown(void);
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+
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+#define __get_user_common(val, size, ptr) \
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+do { \
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+ switch (size) { \
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+ case 1: \
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+ __get_user_asm(val, "lb", ptr); \
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+ break; \
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+ case 2: \
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+ __get_user_asm(val, "lh", ptr); \
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+ break; \
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+ case 4: \
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+ __get_user_asm(val, "lw", ptr); \
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+ break; \
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+ case 8: \
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+ if ((copy_from_user((void *)&val, ptr, 8)) == 0) \
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+ __gu_err = 0; \
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+ else \
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+ __gu_err = -EFAULT; \
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+ break; \
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+ default: \
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+ __get_user_unknown(); \
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+ break; \
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+ } \
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+} while (0)
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+
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+#define __get_user_nocheck(x, ptr, size) \
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+({ \
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+ long __gu_err = 0; \
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+ __get_user_common((x), size, ptr); \
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+ __gu_err; \
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+})
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+
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+#define __get_user_check(x, ptr, size) \
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+({ \
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+ long __gu_err = -EFAULT; \
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+ const __typeof__(*(ptr)) __user *__gu_ptr = (ptr); \
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+ \
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+ if (likely(access_ok(VERIFY_READ, __gu_ptr, size))) \
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+ __get_user_common((x), size, __gu_ptr); \
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+ \
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+ __gu_err; \
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+})
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+
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+#define __get_user_asm(val, insn, addr) \
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+{ \
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+ long __gu_tmp; \
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+ \
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+ __asm__ __volatile__( \
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+ "1:" insn " %1, %3\n" \
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+ "2:\n" \
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+ ".section .fixup,\"ax\"\n" \
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+ "3:li %0, %4\n" \
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+ "j 2b\n" \
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+ ".previous\n" \
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+ ".section __ex_table,\"a\"\n" \
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+ ".word 1b, 3b\n" \
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+ ".previous\n" \
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+ : "=r" (__gu_err), "=r" (__gu_tmp) \
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+ : "0" (0), "o" (__m(addr)), "i" (-EFAULT)); \
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+ \
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+ (val) = (__typeof__(*(addr))) __gu_tmp; \
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+}
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+
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+/*
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+ * Yuck. We need two variants, one for 64bit operation and one
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+ * for 32 bit mode and old iron.
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+ */
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+#define __put_user_nocheck(val, ptr, size) \
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+({ \
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+ __typeof__(*(ptr)) __pu_val; \
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+ long __pu_err = 0; \
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+ \
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+ __pu_val = (val); \
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+ switch (size) { \
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+ case 1: \
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+ __put_user_asm("sb", ptr); \
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+ break; \
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+ case 2: \
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+ __put_user_asm("sh", ptr); \
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+ break; \
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+ case 4: \
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+ __put_user_asm("sw", ptr); \
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+ break; \
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+ case 8: \
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+ if ((__copy_to_user((void *)ptr, &__pu_val, 8)) == 0) \
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+ __pu_err = 0; \
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+ else \
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+ __pu_err = -EFAULT; \
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+ break; \
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+ default: \
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+ __put_user_unknown(); \
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+ break; \
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+ } \
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+ __pu_err; \
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+})
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+
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+
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+#define __put_user_check(val, ptr, size) \
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+({ \
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+ __typeof__(*(ptr)) __user *__pu_addr = (ptr); \
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+ __typeof__(*(ptr)) __pu_val = (val); \
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+ long __pu_err = -EFAULT; \
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+ \
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+ if (likely(access_ok(VERIFY_WRITE, __pu_addr, size))) { \
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+ switch (size) { \
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+ case 1: \
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+ __put_user_asm("sb", __pu_addr); \
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+ break; \
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+ case 2: \
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+ __put_user_asm("sh", __pu_addr); \
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+ break; \
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+ case 4: \
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+ __put_user_asm("sw", __pu_addr); \
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+ break; \
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+ case 8: \
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+ if ((__copy_to_user((void *)__pu_addr, &__pu_val, 8)) == 0)\
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+ __pu_err = 0; \
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+ else \
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+ __pu_err = -EFAULT; \
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+ break; \
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+ default: \
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+ __put_user_unknown(); \
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+ break; \
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+ } \
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+ } \
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+ __pu_err; \
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+})
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+
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+#define __put_user_asm(insn, ptr) \
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+ __asm__ __volatile__( \
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+ "1:" insn " %2, %3\n" \
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+ "2:\n" \
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+ ".section .fixup,\"ax\"\n" \
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+ "3:li %0, %4\n" \
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+ "j 2b\n" \
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+ ".previous\n" \
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+ ".section __ex_table,\"a\"\n" \
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+ ".word 1b, 3b\n" \
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+ ".previous\n" \
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+ : "=r" (__pu_err) \
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+ : "0" (0), "r" (__pu_val), "o" (__m(ptr)), \
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+ "i" (-EFAULT));
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+
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+extern void __put_user_unknown(void);
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+extern int __copy_tofrom_user(void *to, const void *from, unsigned long len);
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+
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+static inline unsigned long
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+copy_from_user(void *to, const void *from, unsigned long len)
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+{
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+ unsigned long over;
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+
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+ if (access_ok(VERIFY_READ, from, len))
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+ return __copy_tofrom_user(to, from, len);
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+
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+ if ((unsigned long)from < TASK_SIZE) {
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+ over = (unsigned long)from + len - TASK_SIZE;
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+ return __copy_tofrom_user(to, from, len - over) + over;
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+ }
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+ return len;
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+}
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+
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+static inline unsigned long
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+copy_to_user(void *to, const void *from, unsigned long len)
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+{
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+ unsigned long over;
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+
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+ if (access_ok(VERIFY_WRITE, to, len))
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+ return __copy_tofrom_user(to, from, len);
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+
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+ if ((unsigned long)to < TASK_SIZE) {
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+ over = (unsigned long)to + len - TASK_SIZE;
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+ return __copy_tofrom_user(to, from, len - over) + over;
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+ }
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+ return len;
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+}
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-#ifndef __ASSEMBLY__
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+#define __copy_from_user(to, from, len) \
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+ __copy_tofrom_user((to), (from), (len))
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-#define __range_ok(addr, size) \
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- ((((unsigned long __force)(addr) >= 0x80000000) \
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- || ((unsigned long)(size) > 0x80000000) \
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- || (((unsigned long __force)(addr) + (unsigned long)(size)) > 0x80000000)))
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+#define __copy_to_user(to, from, len) \
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+ __copy_tofrom_user((to), (from), (len))
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-#define __access_ok(addr, size) \
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- (__range_ok((addr), (size)) == 0)
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+static inline unsigned long
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+__copy_to_user_inatomic(void *to, const void *from, unsigned long len)
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+{
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+ return __copy_to_user(to, from, len);
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+}
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-#include <asm-generic/uaccess.h>
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+static inline unsigned long
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+__copy_from_user_inatomic(void *to, const void *from, unsigned long len)
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+{
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+ return __copy_from_user(to, from, len);
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+}
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+
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+#define __copy_in_user(to, from, len) __copy_from_user(to, from, len)
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+
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+static inline unsigned long
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+copy_in_user(void *to, const void *from, unsigned long len)
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+{
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+ if (access_ok(VERIFY_READ, from, len) &&
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+ access_ok(VERFITY_WRITE, to, len))
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+ return copy_from_user(to, from, len);
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+}
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+
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+/*
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+ * __clear_user: - Zero a block of memory in user space, with less checking.
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+ * @to: Destination address, in user space.
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+ * @n: Number of bytes to zero.
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+ *
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+ * Zero a block of memory in user space. Caller must check
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+ * the specified block with access_ok() before calling this function.
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+ *
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+ * Returns number of bytes that could not be cleared.
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+ * On success, this will be zero.
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+ */
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+extern unsigned long __clear_user(void __user *src, unsigned long size);
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+
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+static inline unsigned long clear_user(char *src, unsigned long size)
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+{
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+ if (access_ok(VERIFY_WRITE, src, size))
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+ return __clear_user(src, size);
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+
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+ return -EFAULT;
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+}
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+/*
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+ * __strncpy_from_user: - Copy a NUL terminated string from userspace, with less checking.
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+ * @dst: Destination address, in kernel space. This buffer must be at
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+ * least @count bytes long.
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+ * @src: Source address, in user space.
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+ * @count: Maximum number of bytes to copy, including the trailing NUL.
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+ *
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+ * Copies a NUL-terminated string from userspace to kernel space.
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+ * Caller must check the specified block with access_ok() before calling
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+ * this function.
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+ *
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+ * On success, returns the length of the string (not including the trailing
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+ * NUL).
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+ *
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|
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+ * If access to userspace fails, returns -EFAULT (some data may have been
|
|
|
+ * copied).
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|
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+ *
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+ * If @count is smaller than the length of the string, copies @count bytes
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+ * and returns @count.
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|
|
+ */
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|
|
+extern int __strncpy_from_user(char *dst, const char *src, long len);
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+
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+static inline int strncpy_from_user(char *dst, const char *src, long len)
|
|
|
+{
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|
|
+ if (access_ok(VERIFY_READ, src, 1))
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|
|
+ return __strncpy_from_user(dst, src, len);
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+
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|
+ return -EFAULT;
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|
|
+}
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+
|
|
|
+extern int __strlen_user(const char *src);
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|
|
+static inline long strlen_user(const char __user *src)
|
|
|
+{
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|
|
+ return __strlen_user(src);
|
|
|
+}
|
|
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+
|
|
|
+extern int __strnlen_user(const char *str, long len);
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|
|
+static inline long strnlen_user(const char __user *str, long len)
|
|
|
+{
|
|
|
+ if (!access_ok(VERIFY_READ, str, 0))
|
|
|
+ return 0;
|
|
|
+ else
|
|
|
+ return __strnlen_user(str, len);
|
|
|
+}
|
|
|
+
|
|
|
+struct exception_table_entry {
|
|
|
+ unsigned long insn;
|
|
|
+ unsigned long fixup;
|
|
|
+};
|
|
|
+
|
|
|
+extern int fixup_exception(struct pt_regs *regs);
|
|
|
|
|
|
-#endif /* __ASSEMBLY__ */
|
|
|
+#endif /* __SCORE_UACCESS_H */
|
|
|
|
|
|
-#endif /* _ASM_SCORE_UACCESS_H */
|
Chen Liqin