arch/x86/include/asm/vdso.h

   1 #ifndef _ASM_X86_VDSO_H
   2 #define _ASM_X86_VDSO_H
   3
   4 #ifdef CONFIG_X86_64
   5 extern const char VDSO64_PRELINK[];
   6
   7 /*
   8  * Given a pointer to the vDSO image, find the pointer to VDSO64_name
   9  * as that symbol is defined in the vDSO sources or linker script.
  10  */
  11 #define VDSO64_SYMBOL(base, name)                                       \
  12 ({                                                                      \
  13         extern const char VDSO64_##name[];                              \
  14         (void *)(VDSO64_##name - VDSO64_PRELINK + (unsigned long)(base)); \
  15 })
  16 #endif
  17
  18 #if defined CONFIG_X86_32 || defined CONFIG_COMPAT
  19 extern const char VDSO32_PRELINK[];
  20
  21 /*
  22  * Given a pointer to the vDSO image, find the pointer to VDSO32_name
  23  * as that symbol is defined in the vDSO sources or linker script.
  24  */
  25 #define VDSO32_SYMBOL(base, name)                                       \
  26 ({                                                                      \
  27         extern const char VDSO32_##name[];                              \
  28         (void *)(VDSO32_##name - VDSO32_PRELINK + (unsigned long)(base)); \
  29 })
  30 #endif
  31
  32 /*
  33  * These symbols are defined with the addresses in the vsyscall page.
  34  * See vsyscall-sigreturn.S.
  35  */
  36 extern void __user __kernel_sigreturn;
  37 extern void __user __kernel_rt_sigreturn;
  38
  39 /*
  40  * These symbols are defined by vdso32.S to mark the bounds
  41  * of the ELF DSO images included therein.
  42  */
  43 extern const char vdso32_int80_start, vdso32_int80_end;
  44 extern const char vdso32_syscall_start, vdso32_syscall_end;
  45 extern const char vdso32_sysenter_start, vdso32_sysenter_end;
  46
  47 #endif /* _ASM_X86_VDSO_H */