x86_64: move lib

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 166 insertions, 0 deletions

diff --git a/arch/x86/lib/usercopy_64.c b/arch/x86/lib/usercopy_64.c
new file mode 100644
index 000000000000..893d43f838cc
--- /dev/null
+++ b/arch/x86/lib/usercopy_64.c
@@ -0,0 +1,166 @@
+/* 
+ * User address space access functions.
+ *
+ * Copyright 1997 Andi Kleen <ak@muc.de>
+ * Copyright 1997 Linus Torvalds
+ * Copyright 2002 Andi Kleen <ak@suse.de>
+ */
+#include <linux/module.h>
+#include <asm/uaccess.h>
+
+/*
+ * Copy a null terminated string from userspace.
+ */
+
+#define __do_strncpy_from_user(dst,src,count,res)                          \
+do {                                                                       \
+        long __d0, __d1, __d2;                                             \
+        might_sleep();                                                     \
+        __asm__ __volatile__(                                              \
+                "       testq %1,%1\n"                                     \
+                "       jz 2f\n"                                           \
+                "0:     lodsb\n"                                           \
+                "       stosb\n"                                           \
+                "       testb %%al,%%al\n"                                 \
+                "       jz 1f\n"                                           \
+                "       decq %1\n"                                         \
+                "       jnz 0b\n"                                          \
+                "1:     subq %1,%0\n"                                      \
+                "2:\n"                                                     \
+                ".section .fixup,\"ax\"\n"                                 \
+                "3:     movq %5,%0\n"                                      \
+                "       jmp 2b\n"                                          \
+                ".previous\n"                                              \
+                ".section __ex_table,\"a\"\n"                              \
+                "       .align 8\n"                                        \
+                "       .quad 0b,3b\n"                                     \
+                ".previous"                                                \
+                : "=r"(res), "=c"(count), "=&a" (__d0), "=&S" (__d1),      \
+                  "=&D" (__d2)                                             \
+                : "i"(-EFAULT), "0"(count), "1"(count), "3"(src), "4"(dst) \
+                : "memory");                                               \
+} while (0)
+
+long
+__strncpy_from_user(char *dst, const char __user *src, long count)
+{
+        long res;
+        __do_strncpy_from_user(dst, src, count, res);
+        return res;
+}
+EXPORT_SYMBOL(__strncpy_from_user);
+
+long
+strncpy_from_user(char *dst, const char __user *src, long count)
+{
+        long res = -EFAULT;
+        if (access_ok(VERIFY_READ, src, 1))
+                return __strncpy_from_user(dst, src, count);
+        return res;
+}
+EXPORT_SYMBOL(strncpy_from_user);
+
+/*
+ * Zero Userspace
+ */
+
+unsigned long __clear_user(void __user *addr, unsigned long size)
+{
+        long __d0;
+        might_sleep();
+        /* no memory constraint because it doesn't change any memory gcc knows
+           about */
+        asm volatile(
+                "       testq  %[size8],%[size8]\n"
+                "       jz     4f\n"
+                "0:     movq %[zero],(%[dst])\n"
+                "       addq   %[eight],%[dst]\n"
+                "       decl %%ecx ; jnz   0b\n"
+                "4:     movq  %[size1],%%rcx\n"
+                "       testl %%ecx,%%ecx\n"
+                "       jz     2f\n"
+                "1:     movb   %b[zero],(%[dst])\n"
+                "       incq   %[dst]\n"
+                "       decl %%ecx ; jnz  1b\n"
+                "2:\n"
+                ".section .fixup,\"ax\"\n"
+                "3:     lea 0(%[size1],%[size8],8),%[size8]\n"
+                "       jmp 2b\n"
+                ".previous\n"
+                ".section __ex_table,\"a\"\n"
+                "       .align 8\n"
+                "       .quad 0b,3b\n"
+                "       .quad 1b,2b\n"
+                ".previous"
+                : [size8] "=c"(size), [dst] "=&D" (__d0)
+                : [size1] "r"(size & 7), "[size8]" (size / 8), "[dst]"(addr),
+                  [zero] "r" (0UL), [eight] "r" (8UL));
+        return size;
+}
+EXPORT_SYMBOL(__clear_user);
+
+unsigned long clear_user(void __user *to, unsigned long n)
+{
+        if (access_ok(VERIFY_WRITE, to, n))
+                return __clear_user(to, n);
+        return n;
+}
+EXPORT_SYMBOL(clear_user);
+
+/*
+ * Return the size of a string (including the ending 0)
+ *
+ * Return 0 on exception, a value greater than N if too long
+ */
+
+long __strnlen_user(const char __user *s, long n)
+{
+        long res = 0;
+        char c;
+
+        while (1) {
+                if (res>n)
+                        return n+1;
+                if (__get_user(c, s))
+                        return 0;
+                if (!c)
+                        return res+1;
+                res++;
+                s++;
+        }
+}
+EXPORT_SYMBOL(__strnlen_user);
+
+long strnlen_user(const char __user *s, long n)
+{
+        if (!access_ok(VERIFY_READ, s, n))
+                return 0;
+        return __strnlen_user(s, n);
+}
+EXPORT_SYMBOL(strnlen_user);
+
+long strlen_user(const char __user *s)
+{
+        long res = 0;
+        char c;
+
+        for (;;) {
+                if (get_user(c, s))
+                        return 0;
+                if (!c)
+                        return res+1;
+                res++;
+                s++;
+        }
+}
+EXPORT_SYMBOL(strlen_user);
+
+unsigned long copy_in_user(void __user *to, const void __user *from, unsigned len)
+{
+        if (access_ok(VERIFY_WRITE, to, len) && access_ok(VERIFY_READ, from, len)) { 
+                return copy_user_generic((__force void *)to, (__force void *)from, len);
+        } 
+        return len;             
+}
+EXPORT_SYMBOL(copy_in_user);
+