uaccess.h (222ca305c9fd39e5ed8104da25c09b2b79a516a8) uaccess.h (12700c17fc286149324f92d6d380bc48e43f253d)
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * User memory access support for Hexagon
4 *
5 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
6 */
7
8#ifndef _ASM_UACCESS_H
9#define _ASM_UACCESS_H
10/*
11 * User space memory access functions
12 */
13#include <asm/sections.h>
14
15/*
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * User memory access support for Hexagon
4 *
5 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
6 */
7
8#ifndef _ASM_UACCESS_H
9#define _ASM_UACCESS_H
10/*
11 * User space memory access functions
12 */
13#include <asm/sections.h>
14
15/*
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
19 *
20 * Context: User context only. This function may sleep if pagefaults are
21 * enabled.
22 *
23 * Checks if a pointer to a block of memory in user space is valid.
24 *
25 * Returns true (nonzero) if the memory block *may* be valid, false (zero)
26 * if it is definitely invalid.
27 *
28 */
29#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
30#define user_addr_max() (uaccess_kernel() ? ~0UL : TASK_SIZE)
31
32static inline int __access_ok(unsigned long addr, unsigned long size)
33{
34 unsigned long limit = TASK_SIZE;
35
36 return (size <= limit) && (addr <= (limit - size));
37}
38#define __access_ok __access_ok
39
40/*
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
46 * a workaround.
47 */
48

--- 15 unchanged lines hidden --- 		16 * When a kernel-mode page fault is taken, the faulting instruction
17 * address is checked against a table of exception_table_entries.
18 * Each entry is a tuple of the address of an instruction that may
19 * be authorized to fault, and the address at which execution should
20 * be resumed instead of the faulting instruction, so as to effect
21 * a workaround.
22 */
23

--- 15 unchanged lines hidden ---