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Date: Mon, 22 Sep 2008 18:51:28 -0700
From: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
To: Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>
Cc: linux-kernel@...r.kernel.org
Subject: [RFC PATCH -tip 3/4] x86: uaccess: introduce __{put|get}_user_cerr
From: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
Introduce __{put|get}_user_cerr for cumulative error handling.
The following 2 lines are same.
__{put|get}_user_cerr(x, ptr, err);
err |= __{put|get}_user(x, ptr);
Introduce __{put|get}_user_size_cerr for internal use from __{put|get}_user_cerr.
Signed-off-by: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
---
include/asm-x86/uaccess.h | 74 +++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 74 insertions(+), 0 deletions(-)
diff --git a/include/asm-x86/uaccess.h b/include/asm-x86/uaccess.h
index 84b0600..b83448a 100644
--- a/include/asm-x86/uaccess.h
+++ b/include/asm-x86/uaccess.h
@@ -291,6 +291,31 @@ do { \
} \
} while (0)
+#define __put_user_size_cerr(x, ptr, size, retval, errret) \
+do { \
+ __chk_user_ptr(ptr); \
+ switch (size) { \
+ case 1: \
+ __put_user_asm_eop(x, ptr, retval, "b", "b", "iq", \
+ "or", errret); \
+ break; \
+ case 2: \
+ __put_user_asm_eop(x, ptr, retval, "w", "w", "ir", \
+ "or", errret); \
+ break; \
+ case 4: \
+ __put_user_asm_eop(x, ptr, retval, "l", "k", "ir", \
+ "or", errret); \
+ break; \
+ case 8: \
+ __put_user_asm_eop_u64((__typeof__(*ptr))(x), ptr, \
+ "or", retval); \
+ break; \
+ default: \
+ __put_user_bad(); \
+ } \
+} while (0)
+
#else
#define __put_user_size(x, ptr, size, retval, errret) \
@@ -302,6 +327,14 @@ do { \
retval = errret; \
} while (0)
+#define __put_user_size_cerr(x, ptr, size, retval, errret) \
+do { \
+ __typeof__(*(ptr))__pus_tmp = x; \
+ \
+ if (unlikely(__copy_to_user_ll(ptr, &__pus_tmp, size) != 0)) \
+ retval |= errret; \
+} while (0)
+
#define put_user(x, ptr) \
({ \
int __ret_pu; \
@@ -346,6 +379,30 @@ do { \
} \
} while (0)
+#define __get_user_size_cerr(x, ptr, size, retval, errret) \
+do { \
+ __chk_user_ptr(ptr); \
+ switch (size) { \
+ case 1: \
+ __get_user_asm_eop(x, ptr, retval, "b", "b", "=q", \
+ "or", errret); \
+ break; \
+ case 2: \
+ __get_user_asm_eop(x, ptr, retval, "w", "w", "=r", \
+ "or", errret); \
+ break; \
+ case 4: \
+ __get_user_asm_eop(x, ptr, retval, "l", "k", "=r", \
+ "or", errret); \
+ break; \
+ case 8: \
+ __get_user_asm_eop_u64(x, ptr, retval, "or", errret); \
+ break; \
+ default: \
+ (x) = __get_user_bad(); \
+ } \
+} while (0)
+
#define __get_user_asm_eop(x, addr, err, itype, rtype, ltype, eop, errret) \
asm volatile("1: mov"itype" %2,%"rtype"1\n" \
"2:\n" \
@@ -368,6 +425,11 @@ do { \
__pu_err; \
})
+#define __put_user_nocheck_cerr(x, ptr, size, err) \
+do { \
+ __put_user_size_cerr((x), (ptr), (size), (err), -EFAULT); \
+} while (0)
+
#define __get_user_nocheck(x, ptr, size) \
({ \
long __gu_err; \
@@ -377,6 +439,13 @@ do { \
__gu_err; \
})
+#define __get_user_nocheck_cerr(x, ptr, size, err) \
+do { \
+ unsigned long __gu_val; \
+ __get_user_size_cerr(__gu_val, (ptr), (size), (err), -EFAULT); \
+ (x) = (__force __typeof__(*(ptr)))__gu_val; \
+} while (0)
+
/* FIXME: this hack is definitely wrong -AK */
struct __large_struct { unsigned long buf[100]; };
#define __m(x) (*(struct __large_struct __user *)(x))
@@ -423,6 +492,8 @@ struct __large_struct { unsigned long buf[100]; };
#define __get_user(x, ptr) \
__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
+#define __get_user_cerr(x, ptr, err) \
+ __get_user_nocheck_cerr((x), (ptr), sizeof(*(ptr)), (err))
/**
* __put_user: - Write a simple value into user space, with less checking.
* @x: Value to copy to user space.
@@ -445,6 +516,9 @@ struct __large_struct { unsigned long buf[100]; };
#define __put_user(x, ptr) \
__put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
+#define __put_user_cerr(x, ptr, err) \
+ __put_user_nocheck_cerr((__typeof__(*(ptr)))(x), (ptr), \
+ sizeof(*(ptr)), (err))
#define __get_user_unaligned __get_user
#define __put_user_unaligned __put_user
--
1.5.6
--
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