x86_64: move lib

[pandora-kernel.git] / arch / x86 / lib / usercopy_64.c

diff --git a/arch/x86/lib/usercopy_64.c b/arch/x86/lib/usercopy_64.c
new file mode 100644 (file)
index 0000000..893d43f
--- /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);
+