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authorGeert Uytterhoeven <geert@linux-m68k.org>2012-05-29 23:30:08 +0200
committerGeert Uytterhoeven <geert@linux-m68k.org>2012-06-06 15:31:28 +0200
commitd8ce7263e1bc3b6b2b906fec0c5037bc27d21d6a (patch)
tree700796dc3c5c5068d82d159b020d7a7fa50144c8 /arch/m68k
parentf8f5701bdaf9134b1f90e5044a82c66324d2073f (diff)
downloadlinux-linaro-stable-d8ce7263e1bc3b6b2b906fec0c5037bc27d21d6a.tar.gz
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>
Diffstat (limited to 'arch/m68k')
-rw-r--r--arch/m68k/Kconfig2
-rw-r--r--arch/m68k/include/asm/Kbuild2
-rw-r--r--arch/m68k/include/asm/uaccess_mm.h11
-rw-r--r--arch/m68k/lib/uaccess.c74
4 files changed, 11 insertions, 78 deletions
diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index cac5b6be572a..147120128260 100644
--- 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 1a922fad76f7..eafa2539a8ee 100644
--- 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 9c80cd515b20..472c891a4aee 100644
--- 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 5664386338da..5e97f2ee7c11 100644
--- a/arch/m68k/lib/uaccess.c
+++ b/arch/m68k/lib/uaccess.c
@@ -104,80 +104,6 @@ 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
*/