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#include <asm/vdso/vsyscall.h>
 15#include <asm-generic/vmlinux.lds.h>
 16#include <vdso/datapage.h>
 17
 18OUTPUT_FORMAT("elf64-littleaarch64", "elf64-bigaarch64", "elf64-littleaarch64")
 19OUTPUT_ARCH(aarch64)
 20
 21SECTIONS
 22{
 23	VDSO_VVAR_SYMS
 24
 25	. = SIZEOF_HEADERS;
 26
 27	.hash		: { *(.hash) }			:text
 28	.gnu.hash	: { *(.gnu.hash) }
 29	.dynsym		: { *(.dynsym) }
 30	.dynstr		: { *(.dynstr) }
 31	.gnu.version	: { *(.gnu.version) }
 32	.gnu.version_d	: { *(.gnu.version_d) }
 33	.gnu.version_r	: { *(.gnu.version_r) }
 34
 35	/*
 36	 * Discard .note.gnu.property sections which are unused and have
 37	 * different alignment requirement from vDSO note sections.
 38	 */
 39	/DISCARD/	: {
 40		*(.note.GNU-stack .note.gnu.property)
 41		*(.ARM.attributes)
 42	}
 43	.note		: { *(.note.*) }		:text	:note
 44
 45	. = ALIGN(16);
 46
 47	.text		: { *(.text*) }			:text	=0xd503201f
 48	PROVIDE (__etext = .);
 49	PROVIDE (_etext = .);
 50	PROVIDE (etext = .);
 51
 52	. = ALIGN(4);
 53	.altinstructions : {
 54		*(.altinstructions)
 55	}
 56
 57	.dynamic	: { *(.dynamic) }		:text	:dynamic
 58
 59	.rela.dyn	: ALIGN(8) { *(.rela .rela*) }
 60
 61	.rodata		: {
 62		*(.rodata*)
 63		*(.got)
 64		*(.got.plt)
 65		*(.plt)
 66		*(.plt.*)
 67		*(.iplt)
 68		*(.igot .igot.plt)
 69	}						:text
 70
 71	_end = .;
 72	PROVIDE(end = .);
 73
 74	DWARF_DEBUG
 75	ELF_DETAILS
 76
 77	/DISCARD/	: {
 78		*(.data .data.* .gnu.linkonce.d.* .sdata*)
 79		*(.bss .sbss .dynbss .dynsbss)
 80		*(.eh_frame .eh_frame_hdr)
 81	}
 82}
 83
 84/*
 85 * We must supply the ELF program headers explicitly to get just one
 86 * PT_LOAD segment, and set the flags explicitly to make segments read-only.
 87 */
 88PHDRS
 89{
 90	text		PT_LOAD		FLAGS(5) FILEHDR PHDRS; /* PF_R|PF_X */
 91	dynamic		PT_DYNAMIC	FLAGS(4);		/* PF_R */
 92	note		PT_NOTE		FLAGS(4);		/* PF_R */
 93}
 94
 95/*
 96 * This controls what symbols we export from the DSO.
 97 */
 98VERSION
 99{
100	LINUX_2.6.39 {
101	global:
102		__kernel_rt_sigreturn;
103		__kernel_gettimeofday;
104		__kernel_clock_gettime;
105		__kernel_clock_getres;
106		__kernel_getrandom;
107	local: *;
108	};
109}
110
111/*
112 * Make the sigreturn code visible to the kernel.
113 */
114VDSO_sigtramp		= __kernel_rt_sigreturn;