arch/riscv/include/asm/vdso.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2012 ARM Limited
   4  * Copyright (C) 2014 Regents of the University of California
   5  * Copyright (C) 2017 SiFive
   6  */
   7
   8 #ifndef _ASM_RISCV_VDSO_H
   9 #define _ASM_RISCV_VDSO_H
  10
  11 /*
  12  * All systems with an MMU have a VDSO, but systems without an MMU don't
  13  * support shared libraries and therefore don't have one.
  14  */
  15 #ifdef CONFIG_MMU
  16
  17 #define __VVAR_PAGES    2
  18
  19 #ifndef __ASSEMBLY__
  20 #include <generated/vdso-offsets.h>
  21
  22 #define VDSO_SYMBOL(base, name)                                                 \
  23         (void __user *)((unsigned long)(base) + __vdso_##name##_offset)
  24
  25 #ifdef CONFIG_COMPAT
  26 #include <generated/compat_vdso-offsets.h>
  27
  28 #define COMPAT_VDSO_SYMBOL(base, name)                                          \
  29         (void __user *)((unsigned long)(base) + compat__vdso_##name##_offset)
  30
  31 extern char compat_vdso_start[], compat_vdso_end[];
  32
  33 #endif /* CONFIG_COMPAT */
  34
  35 extern char vdso_start[], vdso_end[];
  36
  37 #endif /* !__ASSEMBLY__ */
  38
  39 #endif /* CONFIG_MMU */
  40
  41 #endif /* _ASM_RISCV_VDSO_H */