1/*
2 * Linker script for vDSO.  This is an ELF shared object prelinked to
3 * its virtual address, and with only one read-only segment.
4 * This script controls its layout.
5 */
6
7#if defined(BUILD_VDSO64)
8# define SHDR_SIZE 64
9#elif defined(BUILD_VDSO32)
10# define SHDR_SIZE 40
11#else
12# error unknown VDSO target
13#endif
14
15#define NUM_FAKE_SHDRS 7
16
17SECTIONS
18{
19	/*
20	 * User/kernel shared data is before the vDSO.  This may be a little
21	 * uglier than putting it after the vDSO, but it avoids issues with
22	 * non-allocatable things that dangle past the end of the PT_LOAD
23	 * segment. Page size is 8192 for both 64-bit and 32-bit vdso binaries
24	 */
25
26	vvar_start = . -8192;
27	vvar_data = vvar_start;
28
29	. = SIZEOF_HEADERS;
30
31	.hash		: { *(.hash) }			:text
32	.gnu.hash	: { *(.gnu.hash) }
33	.dynsym		: { *(.dynsym) }
34	.dynstr		: { *(.dynstr) }
35	.gnu.version	: { *(.gnu.version) }
36	.gnu.version_d	: { *(.gnu.version_d) }
37	.gnu.version_r	: { *(.gnu.version_r) }
38
39	.dynamic	: { *(.dynamic) }		:text	:dynamic
40
41	.rodata		: {
42		*(.rodata*)
43		*(.data*)
44		*(.sdata*)
45		*(.got.plt) *(.got)
46		*(.gnu.linkonce.d.*)
47		*(.bss*)
48		*(.dynbss*)
49		*(.gnu.linkonce.b.*)
50
51		/*
52		 * Ideally this would live in a C file: kept in here for
53		 * compatibility with x86-64.
54		 */
55		VDSO_FAKE_SECTION_TABLE_START = .;
56		. = . + NUM_FAKE_SHDRS * SHDR_SIZE;
57		VDSO_FAKE_SECTION_TABLE_END = .;
58	}						:text
59
60	.fake_shstrtab	: { *(.fake_shstrtab) }		:text
61
62
63	.note		: { *(.note.*) }		:text	:note
64
65	.eh_frame_hdr	: { *(.eh_frame_hdr) }		:text	:eh_frame_hdr
66	.eh_frame	: { KEEP (*(.eh_frame)) }	:text
67
68
69	/*
70	 * Text is well-separated from actual data: there's plenty of
71	 * stuff that isn't used at runtime in between.
72	 */
73
74	.text		: { *(.text*) }			:text	=0x90909090,
75
76	/DISCARD/ : {
77		*(.discard)
78		*(.discard.*)
79		*(__bug_table)
80	}
81}
82
83/*
84 * Very old versions of ld do not recognize this name token; use the constant.
85 */
86#define PT_GNU_EH_FRAME	0x6474e550
87
88/*
89 * We must supply the ELF program headers explicitly to get just one
90 * PT_LOAD segment, and set the flags explicitly to make segments read-only.
91 */
92PHDRS
93{
94	text		PT_LOAD		FLAGS(5) FILEHDR PHDRS; /* PF_R|PF_X */
95	dynamic		PT_DYNAMIC	FLAGS(4);		/* PF_R */
96	note		PT_NOTE		FLAGS(4);		/* PF_R */
97	eh_frame_hdr	PT_GNU_EH_FRAME;
98}
99