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authorMichal Simek <monstr@monstr.eu>2010-03-22 16:22:41 +0100
committerMichal Simek <monstr@monstr.eu>2010-04-01 08:38:22 +0200
commitef4e277b5d86e56db650137de0b1cd16ded32498 (patch)
tree4a8b2d6a716b9a3aad8e43c5670628e7e005f3cd /arch/microblaze
parent3a6d77245efe062993284fd1c2f7510d9a90efe1 (diff)
downloadlinux-ef4e277b5d86e56db650137de0b1cd16ded32498.tar.bz2
microblaze: uaccess: Fix put_user for noMMU
Here is small regression on dhrystone tests and I think that on all benchmarking tests. It is due to better checking mechanism in put_user macro Signed-off-by: Michal Simek <monstr@monstr.eu>
Diffstat (limited to 'arch/microblaze')
-rw-r--r--arch/microblaze/include/asm/uaccess.h78
1 files changed, 56 insertions, 22 deletions
diff --git a/arch/microblaze/include/asm/uaccess.h b/arch/microblaze/include/asm/uaccess.h
index b079ac31a671..4f17950d0a0e 100644
--- a/arch/microblaze/include/asm/uaccess.h
+++ b/arch/microblaze/include/asm/uaccess.h
@@ -213,32 +213,66 @@ extern long __user_bad(void);
? __get_user((x), (ptr)) : -EFAULT; \
})
-/* Undefined function to trigger linker error */
-extern int bad_user_access_length(void);
+#define __put_user_asm(insn, __gu_ptr, __gu_val, __gu_err) \
+({ \
+ __asm__ __volatile__ ( \
+ "1:" insn " %1, %2, r0;" \
+ " addk %0, r0, r0;" \
+ "2: " \
+ __FIXUP_SECTION \
+ "3: brid 2b;" \
+ " addik %0, r0, %3;" \
+ ".previous;" \
+ __EX_TABLE_SECTION \
+ ".word 1b,3b;" \
+ ".previous;" \
+ : "=&r"(__gu_err) \
+ : "r"(__gu_val), "r"(__gu_ptr), "i"(-EFAULT) \
+ ); \
+})
-/* FIXME is not there defined __pu_val */
-#define __put_user(var, ptr) \
+#define __put_user_asm_8(__gu_ptr, __gu_val, __gu_err) \
({ \
- int __pu_err = 0; \
- switch (sizeof(*(ptr))) { \
- case 1: \
- case 2: \
- case 4: \
- *(ptr) = (var); \
- break; \
- case 8: { \
- typeof(*(ptr)) __pu_val = (var); \
- memcpy(ptr, &__pu_val, sizeof(__pu_val)); \
- } \
- break; \
- default: \
- __pu_err = __put_user_bad(); \
- break; \
- } \
- __pu_err; \
+ __asm__ __volatile__ (" lwi %0, %1, 0;" \
+ "1: swi %0, %2, 0;" \
+ " lwi %0, %1, 4;" \
+ "2: swi %0, %2, 4;" \
+ " addk %0, r0, r0;" \
+ "3: " \
+ __FIXUP_SECTION \
+ "4: brid 3b;" \
+ " addik %0, r0, %3;" \
+ ".previous;" \
+ __EX_TABLE_SECTION \
+ ".word 1b,4b,2b,4b;" \
+ ".previous;" \
+ : "=&r"(__gu_err) \
+ : "r"(&__gu_val), "r"(__gu_ptr), "i"(-EFAULT) \
+ ); \
})
-#define __put_user_bad() (bad_user_access_length(), (-EFAULT))
+#define __put_user(x, ptr) \
+({ \
+ __typeof__(*(ptr)) volatile __gu_val = (x); \
+ long __gu_err = 0; \
+ switch (sizeof(__gu_val)) { \
+ case 1: \
+ __put_user_asm("sb", (ptr), __gu_val, __gu_err); \
+ break; \
+ case 2: \
+ __put_user_asm("sh", (ptr), __gu_val, __gu_err); \
+ break; \
+ case 4: \
+ __put_user_asm("sw", (ptr), __gu_val, __gu_err); \
+ break; \
+ case 8: \
+ __put_user_asm_8((ptr), __gu_val, __gu_err); \
+ break; \
+ default: \
+ /*__gu_err = -EINVAL;*/ __gu_err = __user_bad(); \
+ } \
+ __gu_err; \
+})
#define put_user(x, ptr) __put_user((x), (ptr))