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David Brazdil0f672f62019-12-10 10:32:29 +00001/* SPDX-License-Identifier: GPL-2.0-or-later */
Andrew Scullb4b6d4a2019-01-02 15:54:55 +00002/*
3 * Copyright (C) 2015 Imagination Technologies
4 * Author: Alex Smith <alex.smith@imgtec.com>
Andrew Scullb4b6d4a2019-01-02 15:54:55 +00005 */
6
7#ifndef __ASM_VDSO_H
8#define __ASM_VDSO_H
9
10#include <linux/mm_types.h>
David Brazdil0f672f62019-12-10 10:32:29 +000011#include <vdso/datapage.h>
Andrew Scullb4b6d4a2019-01-02 15:54:55 +000012
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 */
28struct 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
43extern struct mips_vdso_image vdso_image;
44
45#ifdef CONFIG_MIPS32_O32
46extern struct mips_vdso_image vdso_image_o32;
47#endif
48
49#ifdef CONFIG_MIPS32_N32
50extern struct mips_vdso_image vdso_image_n32;
51#endif
52
Andrew Scullb4b6d4a2019-01-02 15:54:55 +000053union mips_vdso_data {
David Brazdil0f672f62019-12-10 10:32:29 +000054 struct vdso_data data[CS_BASES];
Andrew Scullb4b6d4a2019-01-02 15:54:55 +000055 u8 page[PAGE_SIZE];
56};
57
Andrew Scullb4b6d4a2019-01-02 15:54:55 +000058#endif /* __ASM_VDSO_H */