LXR linux/arch/arm64/kernel/vdso/vdso.lds.S

   1/*
   2 * GNU linker script for the VDSO library.
   3*
   4 * Copyright (C) 2012 ARM Limited
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 as
   8 * published by the Free Software Foundation.
   9 *
  10 * This program is distributed in the hope that it will be useful,
  11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 * GNU General Public License for more details.
  14 *
  15 * You should have received a copy of the GNU General Public License
  16 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 *
  18 * Author: Will Deacon <will.deacon@arm.com>
  19 * Heavily based on the vDSO linker scripts for other archs.
  20 */
  21
  22#include <linux/const.h>
  23#include <asm/page.h>
  24#include <asm/vdso.h>
  25
  26OUTPUT_FORMAT("elf64-littleaarch64", "elf64-bigaarch64", "elf64-littleaarch64")
  27OUTPUT_ARCH(aarch64)
  28
  29SECTIONS
  30{
  31        PROVIDE(_vdso_data = . - PAGE_SIZE);
  32        . = VDSO_LBASE + SIZEOF_HEADERS;
  33
  34        .hash           : { *(.hash) }                  :text
  35        .gnu.hash       : { *(.gnu.hash) }
  36        .dynsym         : { *(.dynsym) }
  37        .dynstr         : { *(.dynstr) }
  38        .gnu.version    : { *(.gnu.version) }
  39        .gnu.version_d  : { *(.gnu.version_d) }
  40        .gnu.version_r  : { *(.gnu.version_r) }
  41
  42        .note           : { *(.note.*) }                :text   :note
  43
  44        . = ALIGN(16);
  45
  46        .text           : { *(.text*) }                 :text   =0xd503201f
  47        PROVIDE (__etext = .);
  48        PROVIDE (_etext = .);
  49        PROVIDE (etext = .);
  50
  51        .eh_frame_hdr   : { *(.eh_frame_hdr) }          :text   :eh_frame_hdr
  52        .eh_frame       : { KEEP (*(.eh_frame)) }       :text
  53
  54        .dynamic        : { *(.dynamic) }               :text   :dynamic
  55
  56        .rodata         : { *(.rodata*) }               :text
  57
  58        _end = .;
  59        PROVIDE(end = .);
  60
  61        /DISCARD/       : {
  62                *(.note.GNU-stack)
  63                *(.data .data.* .gnu.linkonce.d.* .sdata*)
  64                *(.bss .sbss .dynbss .dynsbss)
  65        }
  66}
  67
  68/*
  69 * We must supply the ELF program headers explicitly to get just one
  70 * PT_LOAD segment, and set the flags explicitly to make segments read-only.
  71 */
  72PHDRS
  73{
  74        text            PT_LOAD         FLAGS(5) FILEHDR PHDRS; /* PF_R|PF_X */
  75        dynamic         PT_DYNAMIC      FLAGS(4);               /* PF_R */
  76        note            PT_NOTE         FLAGS(4);               /* PF_R */
  77        eh_frame_hdr    PT_GNU_EH_FRAME;
  78}
  79
  80/*
  81 * This controls what symbols we export from the DSO.
  82 */
  83VERSION
  84{
  85        LINUX_2.6.39 {
  86        global:
  87                __kernel_rt_sigreturn;
  88                __kernel_gettimeofday;
  89                __kernel_clock_gettime;
  90                __kernel_clock_getres;
  91        local: *;
  92        };
  93}
  94
  95/*
  96 * Make the sigreturn code visible to the kernel.
  97 */
  98VDSO_sigtramp           = __kernel_rt_sigreturn;
  99