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 | |
10 | SECTIONS |
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 | } :text =0x90909090, |
81 | |
82 | |
83 | |
84 | .altinstructions : { *(.altinstructions) } :text |
85 | .altinstr_replacement : { *(.altinstr_replacement) } :text |
86 | |
87 | __ex_table : { *(__ex_table) } :text |
88 | |
89 | /DISCARD/ : { |
90 | *(.discard) |
91 | *(.discard.*) |
92 | *(__bug_table) |
93 | } |
94 | } |
95 | |
96 | /* |
97 | * Very old versions of ld do not recognize this name token; use the constant. |
98 | */ |
99 | #define PT_GNU_EH_FRAME 0x6474e550 |
100 | |
101 | /* |
102 | * We must supply the ELF program headers explicitly to get just one |
103 | * PT_LOAD segment, and set the flags explicitly to make segments read-only. |
104 | */ |
105 | PHDRS |
106 | { |
107 | text PT_LOAD FLAGS(5) FILEHDR PHDRS; /* PF_R|PF_X */ |
108 | dynamic PT_DYNAMIC FLAGS(4); /* PF_R */ |
109 | note PT_NOTE FLAGS(4); /* PF_R */ |
110 | eh_frame_hdr PT_GNU_EH_FRAME; |
111 | } |
112 | |