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Diffstat (limited to 'arch/powerpc/include/asm/uaccess.h')
-rw-r--r--arch/powerpc/include/asm/uaccess.h67
1 files changed, 21 insertions, 46 deletions
diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h
index 604d705f1bb8..916daa4b4d0d 100644
--- a/arch/powerpc/include/asm/uaccess.h
+++ b/arch/powerpc/include/asm/uaccess.h
@@ -8,62 +8,21 @@
#include <asm/extable.h>
#include <asm/kup.h>
-/*
- * The fs value determines whether argument validity checking should be
- * performed or not. If get_fs() == USER_DS, checking is performed, with
- * get_fs() == KERNEL_DS, checking is bypassed.
- *
- * For historical reasons, these macros are grossly misnamed.
- *
- * The fs/ds values are now the highest legal address in the "segment".
- * This simplifies the checking in the routines below.
- */
-
-#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
-
-#define KERNEL_DS MAKE_MM_SEG(~0UL)
#ifdef __powerpc64__
/* We use TASK_SIZE_USER64 as TASK_SIZE is not constant */
-#define USER_DS MAKE_MM_SEG(TASK_SIZE_USER64 - 1)
+#define TASK_SIZE_MAX TASK_SIZE_USER64
#else
-#define USER_DS MAKE_MM_SEG(TASK_SIZE - 1)
+#define TASK_SIZE_MAX TASK_SIZE
#endif
-#define get_fs() (current->thread.addr_limit)
-
-static inline void set_fs(mm_segment_t fs)
+static inline bool __access_ok(unsigned long addr, unsigned long size)
{
- current->thread.addr_limit = fs;
- /* On user-mode return check addr_limit (fs) is correct */
- set_thread_flag(TIF_FSCHECK);
+ return addr < TASK_SIZE_MAX && size <= TASK_SIZE_MAX - addr;
}
-#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
-#define user_addr_max() (get_fs().seg)
-
-#ifdef __powerpc64__
-/*
- * This check is sufficient because there is a large enough
- * gap between user addresses and the kernel addresses
- */
-#define __access_ok(addr, size, segment) \
- (((addr) <= (segment).seg) && ((size) <= (segment).seg))
-
-#else
-
-static inline int __access_ok(unsigned long addr, unsigned long size,
- mm_segment_t seg)
-{
- if (addr > seg.seg)
- return 0;
- return (size == 0 || size - 1 <= seg.seg - addr);
-}
-
-#endif
-
#define access_ok(addr, size) \
(__chk_user_ptr(addr), \
- __access_ok((__force unsigned long)(addr), (size), get_fs()))
+ __access_ok((unsigned long)(addr), (size)))
/*
* These are the main single-value transfer routines. They automatically
@@ -604,4 +563,20 @@ do { \
__put_user_goto(*(u8*)(_src + _i), (u8 __user *)(_dst + _i), e);\
} while (0)
+#define HAVE_GET_KERNEL_NOFAULT
+
+#define __get_kernel_nofault(dst, src, type, err_label) \
+do { \
+ int __kr_err; \
+ \
+ __get_user_size_allowed(*((type *)(dst)), (__force type __user *)(src),\
+ sizeof(type), __kr_err); \
+ if (unlikely(__kr_err)) \
+ goto err_label; \
+} while (0)
+
+#define __put_kernel_nofault(dst, src, type, err_label) \
+ __put_user_size_goto(*((type *)(src)), \
+ (__force type __user *)(dst), sizeof(type), err_label)
+
#endif /* _ARCH_POWERPC_UACCESS_H */