diff options
Diffstat (limited to 'arch/blackfin/include/asm/uaccess.h')
| -rw-r--r-- | arch/blackfin/include/asm/uaccess.h | 103 |
1 files changed, 59 insertions, 44 deletions
diff --git a/arch/blackfin/include/asm/uaccess.h b/arch/blackfin/include/asm/uaccess.h index 3248033531e..57701c3b8a5 100644 --- a/arch/blackfin/include/asm/uaccess.h +++ b/arch/blackfin/include/asm/uaccess.h @@ -1,4 +1,7 @@ -/* Changes made by Lineo Inc. May 2001 +/* + * Copyright 2004-2009 Analog Devices Inc. + * + * Licensed under the GPL-2 or later. * * Based on: include/asm-m68knommu/uaccess.h */ @@ -14,9 +17,7 @@ #include <linux/string.h> #include <asm/segment.h> -#ifdef CONFIG_ACCESS_CHECK -# include <asm/bfin-global.h> -#endif +#include <asm/sections.h> #define get_ds() (KERNEL_DS) #define get_fs() (current_thread_info()->addr_limit) @@ -33,23 +34,6 @@ static inline void set_fs(mm_segment_t fs) #define access_ok(type, addr, size) _access_ok((unsigned long)(addr), (size)) -static inline int is_in_rom(unsigned long addr) -{ - /* - * What we are really trying to do is determine if addr is - * in an allocated kernel memory region. If not then assume - * we cannot free it or otherwise de-allocate it. Ideally - * we could restrict this to really being in a ROM or flash, - * but that would need to be done on a board by board basis, - * not globally. - */ - if ((addr < _ramstart) || (addr >= _ramend)) - return (1); - - /* Default case, not in ROM */ - return (0); -} - /* * The fs value determines whether argument validity checking should be * performed or not. If get_fs() == USER_DS, checking is performed, with @@ -59,12 +43,8 @@ static inline int is_in_rom(unsigned long addr) #ifndef CONFIG_ACCESS_CHECK static inline int _access_ok(unsigned long addr, unsigned long size) { return 1; } #else -#ifdef CONFIG_ACCESS_OK_L1 -extern int _access_ok(unsigned long addr, unsigned long size)__attribute__((l1_text)); -#else extern int _access_ok(unsigned long addr, unsigned long size); #endif -#endif /* * The exception table consists of pairs of addresses: the first is the @@ -83,9 +63,6 @@ struct exception_table_entry { unsigned long insn, fixup; }; -/* Returns 0 if exception not found and fixup otherwise. */ -extern unsigned long search_exception_table(unsigned long); - /* * These are the main single-value transfer routines. They automatically * use the right size if we just have the right pointer type. @@ -95,7 +72,7 @@ extern unsigned long search_exception_table(unsigned long); ({ \ int _err = 0; \ typeof(*(p)) _x = (x); \ - typeof(*(p)) *_p = (p); \ + typeof(*(p)) __user *_p = (p); \ if (!access_ok(VERIFY_WRITE, _p, sizeof(*(_p)))) {\ _err = -EFAULT; \ } \ @@ -114,8 +91,8 @@ extern unsigned long search_exception_table(unsigned long); long _xl, _xh; \ _xl = ((long *)&_x)[0]; \ _xh = ((long *)&_x)[1]; \ - __put_user_asm(_xl, ((long *)_p)+0, ); \ - __put_user_asm(_xh, ((long *)_p)+1, ); \ + __put_user_asm(_xl, ((long __user *)_p)+0, ); \ + __put_user_asm(_xh, ((long __user *)_p)+1, ); \ } break; \ default: \ _err = __put_user_bad(); \ @@ -142,7 +119,7 @@ static inline int bad_user_access_length(void) * aliasing issues. */ -#define __ptr(x) ((unsigned long *)(x)) +#define __ptr(x) ((unsigned long __force *)(x)) #define __put_user_asm(x,p,bhw) \ __asm__ (#bhw"[%1] = %0;\n\t" \ @@ -201,19 +178,20 @@ static inline unsigned long __must_check copy_from_user(void *to, const void __user *from, unsigned long n) { if (access_ok(VERIFY_READ, from, n)) - memcpy(to, from, n); + memcpy(to, (const void __force *)from, n); else return n; return 0; } static inline unsigned long __must_check -copy_to_user(void *to, const void __user *from, unsigned long n) +copy_to_user(void __user *to, const void *from, unsigned long n) { if (access_ok(VERIFY_WRITE, to, n)) - memcpy(to, from, n); + memcpy((void __force *)to, from, n); else return n; + SSYNC(); return 0; } @@ -222,39 +200,76 @@ copy_to_user(void *to, const void __user *from, unsigned long n) */ static inline long __must_check -strncpy_from_user(char *dst, const char *src, long count) +strncpy_from_user(char *dst, const char __user *src, long count) { char *tmp; if (!access_ok(VERIFY_READ, src, 1)) return -EFAULT; - strncpy(dst, src, count); + strncpy(dst, (const char __force *)src, count); for (tmp = dst; *tmp && count > 0; tmp++, count--) ; return (tmp - dst); } /* - * Return the size of a string (including the ending 0) + * Get the size of a string in user space. + * src: The string to measure + * n: The maximum valid length + * + * Get the size of a NUL-terminated string in user space. * - * Return 0 on exception, a value greater than N if too long + * Returns the size of the string INCLUDING the terminating NUL. + * On exception, returns 0. + * If the string is too long, returns a value greater than n. */ -static inline long strnlen_user(const char *src, long n) +static inline long __must_check strnlen_user(const char __user *src, long n) { - return (strlen(src) + 1); + if (!access_ok(VERIFY_READ, src, 1)) + return 0; + return strnlen((const char __force *)src, n) + 1; } -#define strlen_user(str) strnlen_user(str, 32767) +static inline long __must_check strlen_user(const char __user *src) +{ + if (!access_ok(VERIFY_READ, src, 1)) + return 0; + return strlen((const char __force *)src) + 1; +} /* * Zero Userspace */ static inline unsigned long __must_check -__clear_user(void *to, unsigned long n) +__clear_user(void __user *to, unsigned long n) { - memset(to, 0, n); + if (!access_ok(VERIFY_WRITE, to, n)) + return n; + memset((void __force *)to, 0, n); return 0; } #define clear_user(to, n) __clear_user(to, n) +/* How to interpret these return values: + * CORE: can be accessed by core load or dma memcpy + * CORE_ONLY: can only be accessed by core load + * DMA: can only be accessed by dma memcpy + * IDMA: can only be accessed by interprocessor dma memcpy (BF561) + * ITEST: can be accessed by isram memcpy or dma memcpy + */ +enum { + BFIN_MEM_ACCESS_CORE = 0, + BFIN_MEM_ACCESS_CORE_ONLY, + BFIN_MEM_ACCESS_DMA, + BFIN_MEM_ACCESS_IDMA, + BFIN_MEM_ACCESS_ITEST, +}; +/** + * bfin_mem_access_type() - what kind of memory access is required + * @addr: the address to check + * @size: number of bytes needed + * @return: <0 is error, >=0 is BFIN_MEM_ACCESS_xxx enum (see above) + */ +int bfin_mem_access_type(unsigned long addr, unsigned long size); + #endif /* _BLACKFIN_UACCESS_H */ |