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
   6 #include <asm/vdso32.h>
   7
   8 extern const char VDSO32_PRELINK[];
   9
  10 /*
  11  * Given a pointer to the vDSO image, find the pointer to VDSO32_name
  12  * as that symbol is defined in the vDSO sources or linker script.
  13  */
  14 #define VDSO32_SYMBOL(base, name)                                       \
  15 ({                                                                      \
  16         extern const char VDSO32_##name[];                              \
  17         (void __user *)(VDSO32_##name + (unsigned long)(base));         \
  18 })
  19 #endif
  20
  21 /*
  22  * These symbols are defined with the addresses in the vsyscall page.
  23  * See vsyscall-sigreturn.S.
  24  */
  25 extern void __user __kernel_sigreturn;
  26 extern void __user __kernel_rt_sigreturn;
  27
  28 /*
  29  * These symbols are defined by vdso32.S to mark the bounds
  30  * of the ELF DSO images included therein.
  31  */
  32 extern const char vdso32_int80_start, vdso32_int80_end;
  33 extern const char vdso32_syscall_start, vdso32_syscall_end;
  34 extern const char vdso32_sysenter_start, vdso32_sysenter_end;
  35
  36 void __init patch_vdso32(void *vdso, size_t len);
  37
  38 #endif /* _ASM_X86_VDSO_H */