arch/x86/vdso/vdso_image.h

   1 #ifndef _VDSO_IMAGE_H
   2 #define _VDSO_IMAGE_H
   3
   4 #include <asm/page_types.h>
   5 #include <linux/linkage.h>
   6
   7 #define DEFINE_VDSO_IMAGE(symname, filename)                            \
   8 __PAGE_ALIGNED_DATA ;                                                   \
   9         .globl symname##_start, symname##_end ;                         \
  10         .align PAGE_SIZE ;                                              \
  11         symname##_start: ;                                              \
  12         .incbin filename ;                                              \
  13         symname##_end: ;                                                \
  14         .align PAGE_SIZE /* extra data here leaks to userspace. */ ;    \
  15                                                                         \
  16 .previous ;                                                             \
  17                                                                         \
  18         .globl symname##_pages ;                                        \
  19         .bss ;                                                          \
  20         .align 8 ;                                                      \
  21         .type symname##_pages, @object ;                                \
  22         symname##_pages: ;                                              \
  23         .zero (symname##_end - symname##_start + PAGE_SIZE - 1) / PAGE_SIZE * (BITS_PER_LONG / 8) ; \
  24         .size symname##_pages, .-symname##_pages
  25
  26 #define DECLARE_VDSO_IMAGE(symname)                             \
  27         extern char symname##_start[], symname##_end[];         \
  28         extern struct page *symname##_pages[]
  29
  30 #endif /* _VDSO_IMAGE_H */