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 *)(VDSO32_##name - VDSO32_PRELINK + (unsigned long)(base)); \
  15 })
  16 #endif
  17
  18 /*
  19  * These symbols are defined with the addresses in the vsyscall page.
  20  * See vsyscall-sigreturn.S.
  21  */
  22 extern void __user __kernel_sigreturn;
  23 extern void __user __kernel_rt_sigreturn;
  24
  25 /*
  26  * These symbols are defined by vdso32.S to mark the bounds
  27  * of the ELF DSO images included therein.
  28  */
  29 extern const char vdso32_int80_start, vdso32_int80_end;
  30 extern const char vdso32_syscall_start, vdso32_syscall_end;
  31 extern const char vdso32_sysenter_start, vdso32_sysenter_end;
  32
  33 #endif /* _ASM_X86_VDSO_H */