microblaze: Fix copy_to_user_page macro
copy_to_user_page macro is used in mm/memory.c:access_process_vm
function. This function is called from ptrace code (POKETEXT, POKEDATA)
which write data to memory. Microblaze handle physical address for
caches that's why there is virt_to_phys conversion.
There is potential one location which can caused the problem on WB system.
The important is take a look at write PTRACEs requests
(POKE/TEXT, DATA, USR).
Note:
Majority of Microblaze PTRACE code is moved to generic location
in newer kernel version that's why this solution should work on
the newest kernel version too.
linux/io.h is in cacheflush because of mm/nommu.c
Tested on a WB system - hello world debugging.
Signed-off-by: Michal Simek <monstr@monstr.eu>
diff --git a/arch/microblaze/include/asm/cacheflush.h b/arch/microblaze/include/asm/cacheflush.h
index e9bb567..7ebd955 100644
--- a/arch/microblaze/include/asm/cacheflush.h
+++ b/arch/microblaze/include/asm/cacheflush.h
@@ -103,8 +103,10 @@
#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
do { \
+ u32 addr = virt_to_phys(dst); \
+ invalidate_icache_range((unsigned) (addr), (unsigned) (addr) + (len));\
memcpy((dst), (src), (len)); \
- flush_icache_range((unsigned) (dst), (unsigned) (dst) + (len)); \
+ flush_dcache_range((unsigned) (addr), (unsigned) (addr) + (len));\
} while (0)
#define copy_from_user_page(vma, page, vaddr, dst, src, len) \