root/arch/arm64/kernel/vdso/vdso.lds.S

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * GNU linker script for the VDSO library.
   4 *
   5  * Copyright (C) 2012 ARM Limited
   6  *
   7  * Author: Will Deacon <will.deacon@arm.com>
   8  * Heavily based on the vDSO linker scripts for other archs.
   9  */
  10 
  11 #include <linux/const.h>
  12 #include <asm/page.h>
  13 #include <asm/vdso.h>
  14 
  15 OUTPUT_FORMAT("elf64-littleaarch64", "elf64-bigaarch64", "elf64-littleaarch64")
  16 OUTPUT_ARCH(aarch64)
  17 
  18 SECTIONS
  19 {
  20         PROVIDE(_vdso_data = . - PAGE_SIZE);
  21         . = VDSO_LBASE + SIZEOF_HEADERS;
  22 
  23         .hash           : { *(.hash) }                  :text
  24         .gnu.hash       : { *(.gnu.hash) }
  25         .dynsym         : { *(.dynsym) }
  26         .dynstr         : { *(.dynstr) }
  27         .gnu.version    : { *(.gnu.version) }
  28         .gnu.version_d  : { *(.gnu.version_d) }
  29         .gnu.version_r  : { *(.gnu.version_r) }
  30 
  31         .note           : { *(.note.*) }                :text   :note
  32 
  33         . = ALIGN(16);
  34 
  35         .text           : { *(.text*) }                 :text   =0xd503201f
  36         PROVIDE (__etext = .);
  37         PROVIDE (_etext = .);
  38         PROVIDE (etext = .);
  39 
  40         .eh_frame_hdr   : { *(.eh_frame_hdr) }          :text   :eh_frame_hdr
  41         .eh_frame       : { KEEP (*(.eh_frame)) }       :text
  42 
  43         .dynamic        : { *(.dynamic) }               :text   :dynamic
  44 
  45         .rodata         : { *(.rodata*) }               :text
  46 
  47         _end = .;
  48         PROVIDE(end = .);
  49 
  50         /DISCARD/       : {
  51                 *(.note.GNU-stack)
  52                 *(.data .data.* .gnu.linkonce.d.* .sdata*)
  53                 *(.bss .sbss .dynbss .dynsbss)
  54         }
  55 }
  56 
  57 /*
  58  * We must supply the ELF program headers explicitly to get just one
  59  * PT_LOAD segment, and set the flags explicitly to make segments read-only.
  60  */
  61 PHDRS
  62 {
  63         text            PT_LOAD         FLAGS(5) FILEHDR PHDRS; /* PF_R|PF_X */
  64         dynamic         PT_DYNAMIC      FLAGS(4);               /* PF_R */
  65         note            PT_NOTE         FLAGS(4);               /* PF_R */
  66         eh_frame_hdr    PT_GNU_EH_FRAME;
  67 }
  68 
  69 /*
  70  * This controls what symbols we export from the DSO.
  71  */
  72 VERSION
  73 {
  74         LINUX_2.6.39 {
  75         global:
  76                 __kernel_rt_sigreturn;
  77                 __kernel_gettimeofday;
  78                 __kernel_clock_gettime;
  79                 __kernel_clock_getres;
  80         local: *;
  81         };
  82 }
  83 
  84 /*
  85  * Make the sigreturn code visible to the kernel.
  86  */
  87 VDSO_sigtramp           = __kernel_rt_sigreturn;