diff options
| -rw-r--r-- | arch/microblaze/include/asm/uaccess.h | 89 |
1 files changed, 55 insertions, 34 deletions
diff --git a/arch/microblaze/include/asm/uaccess.h b/arch/microblaze/include/asm/uaccess.h index ce5defb259a..fdb1c1cf51a 100644 --- a/arch/microblaze/include/asm/uaccess.h +++ b/arch/microblaze/include/asm/uaccess.h @@ -71,8 +71,6 @@ struct exception_table_entry { unsigned long insn, fixup; }; -#define __clear_user(addr, n) (memset((void *)(addr), 0, (n)), 0) - #ifndef CONFIG_MMU /* Check against bounds of physical memory */ @@ -86,7 +84,31 @@ static inline int ___range_ok(unsigned long addr, unsigned long size) ___range_ok((unsigned long)(addr), (unsigned long)(size)) #define access_ok(type, addr, size) (__range_ok((addr), (size)) == 0) -#define __access_ok(add, size) (__range_ok((addr), (size)) == 0) + +#else + +/* + * Address is valid if: + * - "addr", "addr + size" and "size" are all below the limit + */ +#define access_ok(type, addr, size) \ + (get_fs().seg > (((unsigned long)(addr)) | \ + (size) | ((unsigned long)(addr) + (size)))) + +/* || printk("access_ok failed for %s at 0x%08lx (size %d), seg 0x%08x\n", + type?"WRITE":"READ",addr,size,get_fs().seg)) */ + +#endif + +#ifdef CONFIG_MMU +# define __FIXUP_SECTION ".section .fixup,\"ax\"\n" +# define __EX_TABLE_SECTION ".section __ex_table,\"a\"\n" +#else +# define __FIXUP_SECTION ".section .discard,\"ax\"\n" +# define __EX_TABLE_SECTION ".section .discard,\"a\"\n" +#endif + +#ifndef CONFIG_MMU /* Undefined function to trigger linker error */ extern int bad_user_access_length(void); @@ -151,6 +173,9 @@ extern int bad_user_access_length(void); #define __copy_from_user_inatomic(to, from, n) \ (__copy_from_user((to), (from), (n))) +#define __clear_user(addr, n) (memset((void *)(addr), 0, (n)), 0) + +/* stejne s MMU */ static inline unsigned long clear_user(void *addr, unsigned long size) { if (access_ok(VERIFY_WRITE, addr, size)) @@ -167,17 +192,6 @@ extern long strnlen_user(const char *src, long count); #else /* CONFIG_MMU */ /* - * Address is valid if: - * - "addr", "addr + size" and "size" are all below the limit - */ -#define access_ok(type, addr, size) \ - (get_fs().seg > (((unsigned long)(addr)) | \ - (size) | ((unsigned long)(addr) + (size)))) - -/* || printk("access_ok failed for %s at 0x%08lx (size %d), seg 0x%08x\n", - type?"WRITE":"READ",addr,size,get_fs().seg)) */ - -/* * All the __XXX versions macros/functions below do not perform * access checking. It is assumed that the necessary checks have been * already performed before the finction (macro) is called. @@ -297,27 +311,34 @@ __asm__ __volatile__ (" lwi %0, %1, 0; \ ); \ }) -/* - * Return: number of not copied bytes, i.e. 0 if OK or non-zero if fail. - */ -static inline int clear_user(char *to, int size) +/* Return: number of not copied bytes, i.e. 0 if OK or non-zero if fail. */ +static inline unsigned long __must_check __clear_user(void __user *to, + unsigned long n) { - if (size && access_ok(VERIFY_WRITE, to, size)) { - __asm__ __volatile__ (" \ - 1: \ - sb r0, %2, r0; \ - addik %0, %0, -1; \ - bneid %0, 1b; \ - addik %2, %2, 1; \ - 2: \ - .section __ex_table,\"a\"; \ - .word 1b,2b; \ - .section .text;" \ - : "=r"(size) \ - : "0"(size), "r"(to) - ); - } - return size; + /* normal memset with two words to __ex_table */ + __asm__ __volatile__ ( \ + "1: sb r0, %2, r0;" \ + " addik %0, %0, -1;" \ + " bneid %0, 1b;" \ + " addik %2, %2, 1;" \ + "2: " \ + __EX_TABLE_SECTION \ + ".word 1b,2b;" \ + ".previous;" \ + : "=r"(n) \ + : "0"(n), "r"(to) + ); + return n; +} + +static inline unsigned long __must_check clear_user(void __user *to, + unsigned long n) +{ + might_sleep(); + if (unlikely(!access_ok(VERIFY_WRITE, to, n))) + return n; + + return __clear_user(to, n); } #define __copy_from_user(to, from, n) copy_from_user((to), (from), (n)) |