LXR linux/arch/sh/kernel/vsyscall/vsyscall.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
   8#ifdef CONFIG_CPU_LITTLE_ENDIAN
   9OUTPUT_FORMAT("elf32-sh-linux", "elf32-sh-linux", "elf32-sh-linux")
  10#else
  11OUTPUT_FORMAT("elf32-shbig-linux", "elf32-shbig-linux", "elf32-shbig-linux")
  12#endif
  13OUTPUT_ARCH(sh)
  14
  15/* The ELF entry point can be used to set the AT_SYSINFO value.  */
  16ENTRY(__kernel_vsyscall);
  17
  18SECTIONS
  19{
  20        . = SIZEOF_HEADERS;
  21
  22        .hash           : { *(.hash) }                  :text
  23        .gnu.hash       : { *(.gnu.hash) }
  24        .dynsym         : { *(.dynsym) }
  25        .dynstr         : { *(.dynstr) }
  26        .gnu.version    : { *(.gnu.version) }
  27        .gnu.version_d  : { *(.gnu.version_d) }
  28        .gnu.version_r  : { *(.gnu.version_r) }
  29
  30        /*
  31         * This linker script is used both with -r and with -shared.
  32         * For the layouts to match, we need to skip more than enough
  33         * space for the dynamic symbol table et al.  If this amount
  34         * is insufficient, ld -shared will barf.  Just increase it here.
  35         */
  36        . = 0x400;
  37
  38        .text           : { *(.text) }                  :text   =0x90909090
  39        .note           : { *(.note.*) }                :text   :note
  40        .eh_frame_hdr   : { *(.eh_frame_hdr ) }         :text   :eh_frame_hdr
  41        .eh_frame       : {
  42                KEEP (*(.eh_frame))
  43                LONG (0)
  44        }                                               :text
  45        .dynamic        : { *(.dynamic) }               :text   :dynamic
  46        .useless        : {
  47              *(.got.plt) *(.got)
  48              *(.data .data.* .gnu.linkonce.d.*)
  49              *(.dynbss)
  50              *(.bss .bss.* .gnu.linkonce.b.*)
  51        }                                               :text
  52}
  53
  54/*
  55 * Very old versions of ld do not recognize this name token; use the constant.
  56 */
  57#define PT_GNU_EH_FRAME 0x6474e550
  58
  59/*
  60 * We must supply the ELF program headers explicitly to get just one
  61 * PT_LOAD segment, and set the flags explicitly to make segments read-only.
  62 */
  63PHDRS
  64{
  65        text            PT_LOAD FILEHDR PHDRS FLAGS(5); /* PF_R|PF_X */
  66        dynamic         PT_DYNAMIC FLAGS(4);            /* PF_R */
  67        note            PT_NOTE FLAGS(4);               /* PF_R */
  68        eh_frame_hdr    PT_GNU_EH_FRAME;
  69}
  70
  71/*
  72 * This controls what symbols we export from the DSO.
  73 */
  74VERSION
  75{
  76        LINUX_2.6 {
  77        global:
  78                __kernel_vsyscall;
  79                __kernel_sigreturn;
  80                __kernel_rt_sigreturn;
  81
  82        local: *;
  83        };
  84}
  85