LXR linux/arch/x86/include/asm/vsyscall.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _ASM_X86_VSYSCALL_H
   3#define _ASM_X86_VSYSCALL_H
   4
   5#include <linux/seqlock.h>
   6#include <uapi/asm/vsyscall.h>
   7
   8#ifdef CONFIG_X86_VSYSCALL_EMULATION
   9extern void map_vsyscall(void);
  10extern void set_vsyscall_pgtable_user_bits(pgd_t *root);
  11
  12/*
  13 * Called on instruction fetch fault in vsyscall page.
  14 * Returns true if handled.
  15 */
  16extern bool emulate_vsyscall(struct pt_regs *regs, unsigned long address);
  17#else
  18static inline void map_vsyscall(void) {}
  19static inline bool emulate_vsyscall(struct pt_regs *regs, unsigned long address)
  20{
  21        return false;
  22}
  23#endif
  24
  25#endif /* _ASM_X86_VSYSCALL_H */
  26