LXR linux/arch/mips/include/asm/vdso.h

   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 */
  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
  53union mips_vdso_data {
  54        struct vdso_data data[CS_BASES];
  55        u8 page[PAGE_SIZE];
  56};
  57
  58#endif /* __ASM_VDSO_H */
  59