1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * User memory access support for Hexagon
5 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
11 * User space memory access functions
13 #include <asm/sections.h>
16 * access_ok: - Checks if a user space pointer is valid
17 * @addr: User space pointer to start of block to check
18 * @size: Size of block to check
20 * Context: User context only. This function may sleep if pagefaults are
23 * Checks if a pointer to a block of memory in user space is valid.
25 * Returns true (nonzero) if the memory block *may* be valid, false (zero)
26 * if it is definitely invalid.
29 #define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
30 #define user_addr_max() (uaccess_kernel() ? ~0UL : TASK_SIZE)
32 static inline int __access_ok(unsigned long addr, unsigned long size)
34 unsigned long limit = TASK_SIZE;
36 return (size <= limit) && (addr <= (limit - size));
38 #define __access_ok __access_ok
41 * When a kernel-mode page fault is taken, the faulting instruction
42 * address is checked against a table of exception_table_entries.
43 * Each entry is a tuple of the address of an instruction that may
44 * be authorized to fault, and the address at which execution should
45 * be resumed instead of the faulting instruction, so as to effect
49 /* Assembly somewhat optimized copy routines */
50 unsigned long raw_copy_from_user(void *to, const void __user *from,
52 unsigned long raw_copy_to_user(void __user *to, const void *from,
54 #define INLINE_COPY_FROM_USER
55 #define INLINE_COPY_TO_USER
57 __kernel_size_t __clear_user_hexagon(void __user *dest, unsigned long count);
58 #define __clear_user(a, s) __clear_user_hexagon((a), (s))
60 #include <asm-generic/uaccess.h>