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  */
  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 */