Yet another dcache aliasing problem.
Since access_process_vm() in kernel 2.6 does not call
flush_cache_page(), it seems copy_to_user_page()/copy_from_user_page()
should flush data cache to resolve aliasing.
Without this fix, gdb will not work correctly. Could you apply?
diff -u linux-mips/include/asm-mips/cacheflush.h linux/include/asm-mips/cacheflush.h
--- linux-mips/include/asm-mips/cacheflush.h 2004-08-14 19:55:59.000000000 +0900
+++ linux/include/asm-mips/cacheflush.h 2005-02-09 17:55:39.402702039 +0900
@@ -56,11 +56,17 @@
#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
do { \
+ if (cpu_has_dc_aliases) \
+ flush_cache_page(vma, vaddr); \
memcpy(dst, (void *) src, len); \
flush_icache_page(vma, page); \
} while (0)
#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
- memcpy(dst, src, len)
+do { \
+ if (cpu_has_dc_aliases) \
+ flush_cache_page(vma, vaddr); \
+ memcpy(dst, src, len); \
+} while (0)
extern void (*flush_cache_sigtramp)(unsigned long addr);
extern void (*flush_icache_all)(void);
---
Atsushi Nemoto
