m68k: Use generic strncpy_from_user(), strlen_user(), and strnlen_user()

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Greg Ungerer <gerg@uclinux.org>

diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index cac5b6b..1471201 100644 (file)
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -7,6 +7,8 @@ config M68K
        select GENERIC_IRQ_SHOW
        select ARCH_HAVE_NMI_SAFE_CMPXCHG if RMW_INSNS
        select GENERIC_CPU_DEVICES
+       select GENERIC_STRNCPY_FROM_USER if MMU
+       select GENERIC_STRNLEN_USER if MMU
        select FPU if MMU
        select ARCH_USES_GETTIMEOFFSET if MMU && !COLDFIRE
 

diff --git a/arch/m68k/include/asm/Kbuild b/arch/m68k/include/asm/Kbuild
index 1a922fa..eafa253 100644 (file)
--- a/arch/m68k/include/asm/Kbuild
+++ b/arch/m68k/include/asm/Kbuild
@@ -1,2 +1,4 @@
 include include/asm-generic/Kbuild.asm
 header-y += cachectl.h
+
+generic-y += word-at-a-time.h

diff --git a/arch/m68k/include/asm/uaccess_mm.h b/arch/m68k/include/asm/uaccess_mm.h
index 9c80cd5..472c891 100644 (file)
--- a/arch/m68k/include/asm/uaccess_mm.h
+++ b/arch/m68k/include/asm/uaccess_mm.h
@@ -379,12 +379,15 @@ __constant_copy_to_user(void __user *to, const void *from, unsigned long n)
 #define copy_from_user(to, from, n)    __copy_from_user(to, from, n)
 #define copy_to_user(to, from, n)      __copy_to_user(to, from, n)
 
-long strncpy_from_user(char *dst, const char __user *src, long count);
-long strnlen_user(const char __user *src, long n);
+#define user_addr_max() \
+       (segment_eq(get_fs(), USER_DS) ? TASK_SIZE : ~0UL)
+
+extern long strncpy_from_user(char *dst, const char __user *src, long count);
+extern __must_check long strlen_user(const char __user *str);
+extern __must_check long strnlen_user(const char __user *str, long n);
+
 unsigned long __clear_user(void __user *to, unsigned long n);
 
 #define clear_user     __clear_user
 
-#define strlen_user(str) strnlen_user(str, 32767)
-
 #endif /* _M68K_UACCESS_H */

diff --git a/arch/m68k/lib/uaccess.c b/arch/m68k/lib/uaccess.c
index 5664386..5e97f2e 100644 (file)
--- a/arch/m68k/lib/uaccess.c
+++ b/arch/m68k/lib/uaccess.c
@@ -103,80 +103,6 @@ unsigned long __generic_copy_to_user(void __user *to, const void *from,
 }
 EXPORT_SYMBOL(__generic_copy_to_user);
 
-/*
- * Copy a null terminated string from userspace.
- */
-long strncpy_from_user(char *dst, const char __user *src, long count)
-{
-       long res;
-       char c;
-
-       if (count <= 0)
-               return count;
-
-       asm volatile ("\n"
-               "1:     "MOVES".b       (%2)+,%4\n"
-               "       move.b  %4,(%1)+\n"
-               "       jeq     2f\n"
-               "       subq.l  #1,%3\n"
-               "       jne     1b\n"
-               "2:     sub.l   %3,%0\n"
-               "3:\n"
-               "       .section .fixup,\"ax\"\n"
-               "       .even\n"
-               "10:    move.l  %5,%0\n"
-               "       jra     3b\n"
-               "       .previous\n"
-               "\n"
-               "       .section __ex_table,\"a\"\n"
-               "       .align  4\n"
-               "       .long   1b,10b\n"
-               "       .previous"
-               : "=d" (res), "+a" (dst), "+a" (src), "+r" (count), "=&d" (c)
-               : "i" (-EFAULT), "0" (count));
-
-       return res;
-}
-EXPORT_SYMBOL(strncpy_from_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 *src, long n)
-{
-       char c;
-       long res;
-
-       asm volatile ("\n"
-               "1:     subq.l  #1,%1\n"
-               "       jmi     3f\n"
-               "2:     "MOVES".b       (%0)+,%2\n"
-               "       tst.b   %2\n"
-               "       jne     1b\n"
-               "       jra     4f\n"
-               "\n"
-               "3:     addq.l  #1,%0\n"
-               "4:     sub.l   %4,%0\n"
-               "5:\n"
-               "       .section .fixup,\"ax\"\n"
-               "       .even\n"
-               "20:    sub.l   %0,%0\n"
-               "       jra     5b\n"
-               "       .previous\n"
-               "\n"
-               "       .section __ex_table,\"a\"\n"
-               "       .align  4\n"
-               "       .long   2b,20b\n"
-               "       .previous\n"
-               : "=&a" (res), "+d" (n), "=&d" (c)
-               : "0" (src), "r" (src));
-
-       return res;
-}
-EXPORT_SYMBOL(strnlen_user);
-
 /*
  * Zero Userspace
  */