x86: merge __get_user_asm and its users.
Move __get_user_asm and __get_user_size and __get_user_nocheck
to uaccess.h. This requires us to define a macro at __get_user_size
for the 64-bit access case.
Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/include/asm-x86/uaccess.h b/include/asm-x86/uaccess.h
index bcda5d0..4353b22 100644
--- a/include/asm-x86/uaccess.h
+++ b/include/asm-x86/uaccess.h
@@ -233,6 +233,47 @@
#endif
+#ifdef CONFIG_X86_32
+#define __get_user_asm_u64(x, ptr, retval, errret) (x) = __get_user_bad()
+#else
+#define __get_user_asm_u64(x, ptr, retval, errret) \
+ __get_user_asm(x, ptr, retval, "q", "", "=r", errret)
+#endif
+
+#define __get_user_size(x, ptr, size, retval, errret) \
+do { \
+ retval = 0; \
+ __chk_user_ptr(ptr); \
+ switch (size) { \
+ case 1: \
+ __get_user_asm(x, ptr, retval, "b", "b", "=q", errret); \
+ break; \
+ case 2: \
+ __get_user_asm(x, ptr, retval, "w", "w", "=r", errret); \
+ break; \
+ case 4: \
+ __get_user_asm(x, ptr, retval, "l", "k", "=r", errret); \
+ break; \
+ case 8: \
+ __get_user_asm_u64(x, ptr, retval, errret); \
+ break; \
+ default: \
+ (x) = __get_user_bad(); \
+ } \
+} while (0)
+
+#define __get_user_asm(x, addr, err, itype, rtype, ltype, errret) \
+ asm volatile("1: mov"itype" %2,%"rtype"1\n" \
+ "2:\n" \
+ ".section .fixup,\"ax\"\n" \
+ "3: mov %3,%0\n" \
+ " xor"itype" %"rtype"1,%"rtype"1\n" \
+ " jmp 2b\n" \
+ ".previous\n" \
+ _ASM_EXTABLE(1b, 3b) \
+ : "=r" (err), ltype(x) \
+ : "m" (__m(addr)), "i" (errret), "0" (err))
+
#define __put_user_nocheck(x, ptr, size) \
({ \
long __pu_err; \
@@ -240,7 +281,14 @@
__pu_err; \
})
-
+#define __get_user_nocheck(x, ptr, size) \
+({ \
+ long __gu_err; \
+ unsigned long __gu_val; \
+ __get_user_size(__gu_val, (ptr), (size), __gu_err, -EFAULT); \
+ (x) = (__force __typeof__(*(ptr)))__gu_val; \
+ __gu_err; \
+})
/* FIXME: this hack is definitely wrong -AK */
struct __large_struct { unsigned long buf[100]; };