Merge commit 'v2.6.28-rc2' into core/locking

Conflicts:
	arch/um/include/asm/system.h

1 files changed, 208 insertions, 0 deletions

diff --git a/arch/x86/include/asm/uaccess_64.h b/arch/x86/include/asm/uaccess_64.h
new file mode 100644
index 000000000000..543ba883cc66
--- /dev/null
+++ b/arch/x86/include/asm/uaccess_64.h
@@ -0,0 +1,208 @@
+#ifndef _ASM_X86_UACCESS_64_H
+#define _ASM_X86_UACCESS_64_H
+
+/*
+ * User space memory access functions
+ */
+#include <linux/compiler.h>
+#include <linux/errno.h>
+#include <linux/prefetch.h>
+#include <linux/lockdep.h>
+#include <asm/page.h>
+
+/*
+ * Copy To/From Userspace
+ */
+
+/* Handles exceptions in both to and from, but doesn't do access_ok */
+__must_check unsigned long
+copy_user_generic(void *to, const void *from, unsigned len);
+
+__must_check unsigned long
+copy_to_user(void __user *to, const void *from, unsigned len);
+__must_check unsigned long
+copy_from_user(void *to, const void __user *from, unsigned len);
+__must_check unsigned long
+copy_in_user(void __user *to, const void __user *from, unsigned len);
+
+static __always_inline __must_check
+int __copy_from_user(void *dst, const void __user *src, unsigned size)
+{
+        int ret = 0;
+
+        might_fault();
+        if (!__builtin_constant_p(size))
+                return copy_user_generic(dst, (__force void *)src, size);
+        switch (size) {
+        case 1:__get_user_asm(*(u8 *)dst, (u8 __user *)src,
+                              ret, "b", "b", "=q", 1);
+                return ret;
+        case 2:__get_user_asm(*(u16 *)dst, (u16 __user *)src,
+                              ret, "w", "w", "=r", 2);
+                return ret;
+        case 4:__get_user_asm(*(u32 *)dst, (u32 __user *)src,
+                              ret, "l", "k", "=r", 4);
+                return ret;
+        case 8:__get_user_asm(*(u64 *)dst, (u64 __user *)src,
+                              ret, "q", "", "=r", 8);
+                return ret;
+        case 10:
+                __get_user_asm(*(u64 *)dst, (u64 __user *)src,
+                               ret, "q", "", "=r", 16);
+                if (unlikely(ret))
+                        return ret;
+                __get_user_asm(*(u16 *)(8 + (char *)dst),
+                               (u16 __user *)(8 + (char __user *)src),
+                               ret, "w", "w", "=r", 2);
+                return ret;
+        case 16:
+                __get_user_asm(*(u64 *)dst, (u64 __user *)src,
+                               ret, "q", "", "=r", 16);
+                if (unlikely(ret))
+                        return ret;
+                __get_user_asm(*(u64 *)(8 + (char *)dst),
+                               (u64 __user *)(8 + (char __user *)src),
+                               ret, "q", "", "=r", 8);
+                return ret;
+        default:
+                return copy_user_generic(dst, (__force void *)src, size);
+        }
+}
+
+static __always_inline __must_check
+int __copy_to_user(void __user *dst, const void *src, unsigned size)
+{
+        int ret = 0;
+
+        might_fault();
+        if (!__builtin_constant_p(size))
+                return copy_user_generic((__force void *)dst, src, size);
+        switch (size) {
+        case 1:__put_user_asm(*(u8 *)src, (u8 __user *)dst,
+                              ret, "b", "b", "iq", 1);
+                return ret;
+        case 2:__put_user_asm(*(u16 *)src, (u16 __user *)dst,
+                              ret, "w", "w", "ir", 2);
+                return ret;
+        case 4:__put_user_asm(*(u32 *)src, (u32 __user *)dst,
+                              ret, "l", "k", "ir", 4);
+                return ret;
+        case 8:__put_user_asm(*(u64 *)src, (u64 __user *)dst,
+                              ret, "q", "", "ir", 8);
+                return ret;
+        case 10:
+                __put_user_asm(*(u64 *)src, (u64 __user *)dst,
+                               ret, "q", "", "ir", 10);
+                if (unlikely(ret))
+                        return ret;
+                asm("":::"memory");
+                __put_user_asm(4[(u16 *)src], 4 + (u16 __user *)dst,
+                               ret, "w", "w", "ir", 2);
+                return ret;
+        case 16:
+                __put_user_asm(*(u64 *)src, (u64 __user *)dst,
+                               ret, "q", "", "ir", 16);
+                if (unlikely(ret))
+                        return ret;
+                asm("":::"memory");
+                __put_user_asm(1[(u64 *)src], 1 + (u64 __user *)dst,
+                               ret, "q", "", "ir", 8);
+                return ret;
+        default:
+                return copy_user_generic((__force void *)dst, src, size);
+        }
+}
+
+static __always_inline __must_check
+int __copy_in_user(void __user *dst, const void __user *src, unsigned size)
+{
+        int ret = 0;
+
+        might_fault();
+        if (!__builtin_constant_p(size))
+                return copy_user_generic((__force void *)dst,
+                                         (__force void *)src, size);
+        switch (size) {
+        case 1: {
+                u8 tmp;
+                __get_user_asm(tmp, (u8 __user *)src,
+                               ret, "b", "b", "=q", 1);
+                if (likely(!ret))
+                        __put_user_asm(tmp, (u8 __user *)dst,
+                                       ret, "b", "b", "iq", 1);
+                return ret;
+        }
+        case 2: {
+                u16 tmp;
+                __get_user_asm(tmp, (u16 __user *)src,
+                               ret, "w", "w", "=r", 2);
+                if (likely(!ret))
+                        __put_user_asm(tmp, (u16 __user *)dst,
+                                       ret, "w", "w", "ir", 2);
+                return ret;
+        }
+
+        case 4: {
+                u32 tmp;
+                __get_user_asm(tmp, (u32 __user *)src,
+                               ret, "l", "k", "=r", 4);
+                if (likely(!ret))
+                        __put_user_asm(tmp, (u32 __user *)dst,
+                                       ret, "l", "k", "ir", 4);
+                return ret;
+        }
+        case 8: {
+                u64 tmp;
+                __get_user_asm(tmp, (u64 __user *)src,
+                               ret, "q", "", "=r", 8);
+                if (likely(!ret))
+                        __put_user_asm(tmp, (u64 __user *)dst,
+                                       ret, "q", "", "ir", 8);
+                return ret;
+        }
+        default:
+                return copy_user_generic((__force void *)dst,
+                                         (__force void *)src, size);
+        }
+}
+
+__must_check long
+strncpy_from_user(char *dst, const char __user *src, long count);
+__must_check long
+__strncpy_from_user(char *dst, const char __user *src, long count);
+__must_check long strnlen_user(const char __user *str, long n);
+__must_check long __strnlen_user(const char __user *str, long n);
+__must_check long strlen_user(const char __user *str);
+__must_check unsigned long clear_user(void __user *mem, unsigned long len);
+__must_check unsigned long __clear_user(void __user *mem, unsigned long len);
+
+__must_check long __copy_from_user_inatomic(void *dst, const void __user *src,
+                                            unsigned size);
+
+static __must_check __always_inline int
+__copy_to_user_inatomic(void __user *dst, const void *src, unsigned size)
+{
+        return copy_user_generic((__force void *)dst, src, size);
+}
+
+extern long __copy_user_nocache(void *dst, const void __user *src,
+                                unsigned size, int zerorest);
+
+static inline int __copy_from_user_nocache(void *dst, const void __user *src,
+                                           unsigned size)
+{
+        might_sleep();
+        return __copy_user_nocache(dst, src, size, 1);
+}
+
+static inline int __copy_from_user_inatomic_nocache(void *dst,
+                                                    const void __user *src,
+                                                    unsigned size)
+{
+        return __copy_user_nocache(dst, src, size, 0);
+}
+
+unsigned long
+copy_user_handle_tail(char *to, char *from, unsigned len, unsigned zerorest);
+
+#endif /* _ASM_X86_UACCESS_64_H */