arch/x86/include/asm/vdso.h

   1 #ifndef _ASM_X86_VDSO_H
   2 #define _ASM_X86_VDSO_H
   3
   4 #if defined CONFIG_X86_32 || defined CONFIG_COMPAT
   5 extern const char VDSO32_PRELINK[];
   6
   7 /*
   8  * Given a pointer to the vDSO image, find the pointer to VDSO32_name
   9  * as that symbol is defined in the vDSO sources or linker script.
  10  */
  11 #define VDSO32_SYMBOL(base, name)                                       \
  12 ({                                                                      \
  13         extern const char VDSO32_##name[];                              \
  14         (void __user *)(VDSO32_##name - VDSO32_PRELINK +                \
  15                         (unsigned long)(base));                         \
  16 })
  17 #endif
  18
  19 /*
  20  * These symbols are defined with the addresses in the vsyscall page.
  21  * See vsyscall-sigreturn.S.
  22  */
  23 extern void __user __kernel_sigreturn;
  24 extern void __user __kernel_rt_sigreturn;
  25
  26 /*
  27  * These symbols are defined by vdso32.S to mark the bounds
  28  * of the ELF DSO images included therein.
  29  */
  30 extern const char vdso32_int80_start, vdso32_int80_end;
  31 extern const char vdso32_syscall_start, vdso32_syscall_end;
  32 extern const char vdso32_sysenter_start, vdso32_sysenter_end;
  33
  34 #endif /* _ASM_X86_VDSO_H */