arch/x86/vdso/vdso.lds.S

   1 /*
   2  * Linker script for vsyscall DSO.  The vsyscall page is an ELF shared
   3  * object prelinked to its virtual address, and with only one read-only
   4  * segment (that fits in one page).  This script controls its layout.
   5  */
   6 #include <asm/asm-offsets.h>
   7 #include "voffset.h"
   8
   9 #define VDSO_PRELINK 0xffffffffff700000
  10
  11 SECTIONS
  12 {
  13   . = VDSO_PRELINK + SIZEOF_HEADERS;
  14
  15   .hash           : { *(.hash) }                :text
  16   .gnu.hash       : { *(.gnu.hash) }
  17   .dynsym         : { *(.dynsym) }
  18   .dynstr         : { *(.dynstr) }
  19   .gnu.version    : { *(.gnu.version) }
  20   .gnu.version_d  : { *(.gnu.version_d) }
  21   .gnu.version_r  : { *(.gnu.version_r) }
  22
  23   /* This linker script is used both with -r and with -shared.
  24      For the layouts to match, we need to skip more than enough
  25      space for the dynamic symbol table et al.  If this amount
  26      is insufficient, ld -shared will barf.  Just increase it here.  */
  27   . = VDSO_PRELINK + VDSO_TEXT_OFFSET;
  28
  29   .text           : { *(.text) }                :text
  30   .text.ptr       : { *(.text.ptr) }            :text
  31   . = VDSO_PRELINK + 0x900;
  32   .data           : { *(.data) }                :text
  33   .bss            : { *(.bss) }                 :text
  34
  35   .altinstructions : { *(.altinstructions) }                    :text
  36   .altinstr_replacement  : { *(.altinstr_replacement) } :text
  37
  38   .note           : { *(.note.*) }              :text :note
  39   .eh_frame_hdr   : { *(.eh_frame_hdr) }        :text :eh_frame_hdr
  40   .eh_frame       : { KEEP (*(.eh_frame)) }     :text
  41   .dynamic        : { *(.dynamic) }             :text :dynamic
  42   .useless        : {
  43         *(.got.plt) *(.got)
  44         *(.gnu.linkonce.d.*)
  45         *(.dynbss)
  46         *(.gnu.linkonce.b.*)
  47   }                                             :text
  48 }
  49
  50 /*
  51  * We must supply the ELF program headers explicitly to get just one
  52  * PT_LOAD segment, and set the flags explicitly to make segments read-only.
  53  */
  54 PHDRS
  55 {
  56   text PT_LOAD FILEHDR PHDRS FLAGS(5); /* PF_R|PF_X */
  57   dynamic PT_DYNAMIC FLAGS(4); /* PF_R */
  58   note PT_NOTE FLAGS(4); /* PF_R */
  59   eh_frame_hdr 0x6474e550; /* PT_GNU_EH_FRAME, but ld doesn't match the name */
  60 }
  61
  62 /*
  63  * This controls what symbols we export from the DSO.
  64  */
  65 VERSION
  66 {
  67   LINUX_2.6 {
  68     global:
  69         clock_gettime;
  70         __vdso_clock_gettime;
  71         gettimeofday;
  72         __vdso_gettimeofday;
  73         getcpu;
  74         __vdso_getcpu;
  75     local: *;
  76   };
  77 }