1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * Copyright (C) 2015 Imagination Technologies
4 * Author: Alex Smith <alex.smith@imgtec.com>
5 */
6
7 #ifndef __ASM_VDSO_H
8 #define __ASM_VDSO_H
9
10 #include <linux/mm_types.h>
11 #include <vdso/datapage.h>
12
13 #include <asm/barrier.h>
14
15 /**
16 * struct mips_vdso_image - Details of a VDSO image.
17 * @data: Pointer to VDSO image data (page-aligned).
18 * @size: Size of the VDSO image data (page-aligned).
19 * @off_sigreturn: Offset of the sigreturn() trampoline.
20 * @off_rt_sigreturn: Offset of the rt_sigreturn() trampoline.
21 * @mapping: Special mapping structure.
22 *
23 * This structure contains details of a VDSO image, including the image data
24 * and offsets of certain symbols required by the kernel. It is generated as
25 * part of the VDSO build process, aside from the mapping page array, which is
26 * populated at runtime.
27 */
28 struct mips_vdso_image {
29 void *data;
30 unsigned long size;
31
32 unsigned long off_sigreturn;
33 unsigned long off_rt_sigreturn;
34
35 struct vm_special_mapping mapping;
36 };
37
38 /*
39 * The following structures are auto-generated as part of the build for each
40 * ABI by genvdso, see arch/mips/vdso/Makefile.
41 */
42
43 extern struct mips_vdso_image vdso_image;
44
45 #ifdef CONFIG_MIPS32_O32
46 extern struct mips_vdso_image vdso_image_o32;
47 #endif
48
49 #ifdef CONFIG_MIPS32_N32
50 extern struct mips_vdso_image vdso_image_n32;
51 #endif
52
53 union mips_vdso_data {
54 struct vdso_data data[CS_BASES];
55 u8 page[PAGE_SIZE];
56 };
57
58 #endif /* __ASM_VDSO_H */