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