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