diff options
Diffstat (limited to 'arch/microblaze/include/asm/uaccess.h')
| -rw-r--r-- | arch/microblaze/include/asm/uaccess.h | 115 |
1 files changed, 15 insertions, 100 deletions
diff --git a/arch/microblaze/include/asm/uaccess.h b/arch/microblaze/include/asm/uaccess.h index a1f206b90753..3aab2f17e046 100644 --- a/arch/microblaze/include/asm/uaccess.h +++ b/arch/microblaze/include/asm/uaccess.h @@ -1,95 +1,24 @@ +/* SPDX-License-Identifier: GPL-2.0 */ /* * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> * Copyright (C) 2008-2009 PetaLogix * Copyright (C) 2006 Atmark Techno, Inc. - * - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. */ #ifndef _ASM_MICROBLAZE_UACCESS_H #define _ASM_MICROBLAZE_UACCESS_H #include <linux/kernel.h> -#include <linux/mm.h> #include <asm/mmu.h> #include <asm/page.h> -#include <asm/pgtable.h> +#include <linux/pgtable.h> #include <asm/extable.h> #include <linux/string.h> +#include <asm-generic/access_ok.h> -/* - * On Microblaze the fs value is actually the top of the corresponding - * address space. - * - * The fs value determines whether argument validity checking should be - * performed or not. If get_fs() == USER_DS, checking is performed, with - * get_fs() == KERNEL_DS, checking is bypassed. - * - * For historical reasons, these macros are grossly misnamed. - * - * For non-MMU arch like Microblaze, KERNEL_DS and USER_DS is equal. - */ -# define MAKE_MM_SEG(s) ((mm_segment_t) { (s) }) - -# ifndef CONFIG_MMU -# define KERNEL_DS MAKE_MM_SEG(0) -# define USER_DS KERNEL_DS -# else -# define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF) -# define USER_DS MAKE_MM_SEG(TASK_SIZE - 1) -# endif - -# define get_fs() (current_thread_info()->addr_limit) -# define set_fs(val) (current_thread_info()->addr_limit = (val)) - -# define segment_eq(a, b) ((a).seg == (b).seg) - -#ifndef CONFIG_MMU - -/* Check against bounds of physical memory */ -static inline int ___range_ok(unsigned long addr, unsigned long size) -{ - return ((addr < memory_start) || - ((addr + size - 1) > (memory_start + memory_size - 1))); -} - -#define __range_ok(addr, size) \ - ___range_ok((unsigned long)(addr), (unsigned long)(size)) - -#define access_ok(addr, size) (__range_ok((addr), (size)) == 0) - -#else - -static inline int access_ok(const void __user *addr, unsigned long size) -{ - if (!size) - goto ok; - - if ((get_fs().seg < ((unsigned long)addr)) || - (get_fs().seg < ((unsigned long)addr + size - 1))) { - pr_devel("ACCESS fail at 0x%08x (size 0x%x), seg 0x%08x\n", - (__force u32)addr, (u32)size, - (u32)get_fs().seg); - return 0; - } -ok: - pr_devel("ACCESS OK at 0x%08x (size 0x%x), seg 0x%08x\n", - (__force u32)addr, (u32)size, - (u32)get_fs().seg); - return 1; -} -#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,\"ax\"\n" -#endif extern unsigned long __copy_tofrom_user(void __user *to, const void __user *from, unsigned long size); @@ -171,27 +100,27 @@ extern long __user_bad(void); #define __get_user(x, ptr) \ ({ \ - unsigned long __gu_val = 0; \ long __gu_err; \ switch (sizeof(*(ptr))) { \ case 1: \ - __get_user_asm("lbu", (ptr), __gu_val, __gu_err); \ + __get_user_asm("lbu", (ptr), x, __gu_err); \ break; \ case 2: \ - __get_user_asm("lhu", (ptr), __gu_val, __gu_err); \ + __get_user_asm("lhu", (ptr), x, __gu_err); \ break; \ case 4: \ - __get_user_asm("lw", (ptr), __gu_val, __gu_err); \ + __get_user_asm("lw", (ptr), x, __gu_err); \ break; \ - case 8: \ - __gu_err = __copy_from_user(&__gu_val, ptr, 8); \ - if (__gu_err) \ - __gu_err = -EFAULT; \ + case 8: { \ + __u64 __x = 0; \ + __gu_err = raw_copy_from_user(&__x, ptr, 8) ? \ + -EFAULT : 0; \ + (x) = (typeof(x))(typeof((x) - (x)))__x; \ break; \ + } \ default: \ /* __gu_val = 0; __gu_err = -EINVAL;*/ __gu_err = __user_bad();\ } \ - x = (__force __typeof__(*(ptr))) __gu_val; \ __gu_err; \ }) @@ -327,28 +256,14 @@ raw_copy_to_user(void __user *to, const void *from, unsigned long n) /* * Copy a null terminated string from userspace. */ -extern int __strncpy_user(char *to, const char __user *from, int len); - -static inline long -strncpy_from_user(char *dst, const char __user *src, long count) -{ - if (!access_ok(src, 1)) - return -EFAULT; - return __strncpy_user(dst, src, count); -} +__must_check long strncpy_from_user(char *dst, const char __user *src, + long count); /* * Return the size of a string (including the ending 0) * * Return 0 on exception, a value greater than N if too long */ -extern int __strnlen_user(const char __user *sstr, int len); - -static inline long strnlen_user(const char __user *src, long n) -{ - if (!access_ok(src, 1)) - return 0; - return __strnlen_user(src, n); -} +__must_check long strnlen_user(const char __user *sstr, long len); #endif /* _ASM_MICROBLAZE_UACCESS_H */ |