1/* SPDX-License-Identifier: GPL-2.0 */
2#include <asm/vdso.h>
3
4/*
5 * Linker script for vDSO.  This is an ELF shared object prelinked to
6 * its virtual address, and with only one read-only segment.
7 * This script controls its layout.
8 */
9
10SECTIONS
11{
12	/*
13	 * User/kernel shared data is before the vDSO.  This may be a little
14	 * uglier than putting it after the vDSO, but it avoids issues with
15	 * non-allocatable things that dangle past the end of the PT_LOAD
16	 * segment.
17	 */
18
19	vvar_start = . - 4 * PAGE_SIZE;
20	vvar_page  = vvar_start;
21
22	/* Place all vvars at the offsets in asm/vvar.h. */
23#define EMIT_VVAR(name, offset) vvar_ ## name = vvar_page + offset;
24#include <asm/vvar.h>
25#undef EMIT_VVAR
26
27	pvclock_page = vvar_start + PAGE_SIZE;
28	hvclock_page = vvar_start + 2 * PAGE_SIZE;
29	timens_page  = vvar_start + 3 * PAGE_SIZE;
30
31#undef _ASM_X86_VVAR_H
32	/* Place all vvars in timens too at the offsets in asm/vvar.h. */
33#define EMIT_VVAR(name, offset) timens_ ## name = timens_page + offset;
34#include <asm/vvar.h>
35#undef EMIT_VVAR
36
37	. = SIZEOF_HEADERS;
38
39	.hash		: { *(.hash) }			:text
40	.gnu.hash	: { *(.gnu.hash) }
41	.dynsym		: { *(.dynsym) }
42	.dynstr		: { *(.dynstr) }
43	.gnu.version	: { *(.gnu.version) }
44	.gnu.version_d	: { *(.gnu.version_d) }
45	.gnu.version_r	: { *(.gnu.version_r) }
46
47	.dynamic	: { *(.dynamic) }		:text	:dynamic
48
49	.rodata		: {
50		*(.rodata*)
51		*(.data*)
52		*(.sdata*)
53		*(.got.plt) *(.got)
54		*(.gnu.linkonce.d.*)
55		*(.bss*)
56		*(.dynbss*)
57		*(.gnu.linkonce.b.*)
58	}						:text
59
60	/*
61	 * Discard .note.gnu.property sections which are unused and have
62	 * different alignment requirement from vDSO note sections.
63	 */
64	/DISCARD/ : {
65		*(.note.gnu.property)
66	}
67	.note		: { *(.note.*) }		:text	:note
68
69	.eh_frame_hdr	: { *(.eh_frame_hdr) }		:text	:eh_frame_hdr
70	.eh_frame	: { KEEP (*(.eh_frame)) }	:text
71
72
73	/*
74	 * Text is well-separated from actual data: there's plenty of
75	 * stuff that isn't used at runtime in between.
76	 */
77
78	.text		: {
79		*(.text*)
80		*(.fixup)
81	}						:text	=0x90909090,
82
83
84
85	.altinstructions	: { *(.altinstructions) }	:text
86	.altinstr_replacement	: { *(.altinstr_replacement) }	:text
87
88	__ex_table		: { *(__ex_table) }		:text
89
90	/DISCARD/ : {
91		*(.discard)
92		*(.discard.*)
93		*(__bug_table)
94	}
95}
96
97/*
98 * Very old versions of ld do not recognize this name token; use the constant.
99 */
100#define PT_GNU_EH_FRAME	0x6474e550
101
102/*
103 * We must supply the ELF program headers explicitly to get just one
104 * PT_LOAD segment, and set the flags explicitly to make segments read-only.
105 */
106PHDRS
107{
108	text		PT_LOAD		FLAGS(5) FILEHDR PHDRS; /* PF_R|PF_X */
109	dynamic		PT_DYNAMIC	FLAGS(4);		/* PF_R */
110	note		PT_NOTE		FLAGS(4);		/* PF_R */
111	eh_frame_hdr	PT_GNU_EH_FRAME;
112}
113