Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
18d0a6fd AL |
2 | #include <asm/vdso.h> |
3 | ||
f6b46ebf RM |
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 | ||
bfad381c AL |
10 | #if defined(BUILD_VDSO64) |
11 | # define SHDR_SIZE 64 | |
12 | #elif defined(BUILD_VDSO32) || defined(BUILD_VDSOX32) | |
13 | # define SHDR_SIZE 40 | |
14 | #else | |
15 | # error unknown VDSO target | |
16 | #endif | |
17 | ||
0e3727a8 | 18 | #define NUM_FAKE_SHDRS 13 |
bfad381c | 19 | |
f6b46ebf RM |
20 | SECTIONS |
21 | { | |
e6577a7c AL |
22 | /* |
23 | * User/kernel shared data is before the vDSO. This may be a little | |
24 | * uglier than putting it after the vDSO, but it avoids issues with | |
25 | * non-allocatable things that dangle past the end of the PT_LOAD | |
26 | * segment. | |
27 | */ | |
28 | ||
90b20432 | 29 | vvar_start = . - 3 * PAGE_SIZE; |
e6577a7c AL |
30 | vvar_page = vvar_start; |
31 | ||
32 | /* Place all vvars at the offsets in asm/vvar.h. */ | |
33 | #define EMIT_VVAR(name, offset) vvar_ ## name = vvar_page + offset; | |
34 | #define __VVAR_KERNEL_LDS | |
35 | #include <asm/vvar.h> | |
36 | #undef __VVAR_KERNEL_LDS | |
37 | #undef EMIT_VVAR | |
38 | ||
1ed95e52 | 39 | pvclock_page = vvar_start + PAGE_SIZE; |
90b20432 | 40 | hvclock_page = vvar_start + 2 * PAGE_SIZE; |
e6577a7c | 41 | |
b0b49f26 | 42 | . = SIZEOF_HEADERS; |
f6b46ebf RM |
43 | |
44 | .hash : { *(.hash) } :text | |
45 | .gnu.hash : { *(.gnu.hash) } | |
46 | .dynsym : { *(.dynsym) } | |
47 | .dynstr : { *(.dynstr) } | |
48 | .gnu.version : { *(.gnu.version) } | |
49 | .gnu.version_d : { *(.gnu.version_d) } | |
50 | .gnu.version_r : { *(.gnu.version_r) } | |
51 | ||
f6b46ebf RM |
52 | .dynamic : { *(.dynamic) } :text :dynamic |
53 | ||
bfad381c AL |
54 | .rodata : { |
55 | *(.rodata*) | |
0e3727a8 AL |
56 | *(.data*) |
57 | *(.sdata*) | |
58 | *(.got.plt) *(.got) | |
59 | *(.gnu.linkonce.d.*) | |
60 | *(.bss*) | |
61 | *(.dynbss*) | |
62 | *(.gnu.linkonce.b.*) | |
bfad381c AL |
63 | |
64 | /* | |
65 | * Ideally this would live in a C file, but that won't | |
66 | * work cleanly for x32 until we start building the x32 | |
67 | * C code using an x32 toolchain. | |
68 | */ | |
69 | VDSO_FAKE_SECTION_TABLE_START = .; | |
70 | . = . + NUM_FAKE_SHDRS * SHDR_SIZE; | |
71 | VDSO_FAKE_SECTION_TABLE_END = .; | |
72 | } :text | |
73 | ||
74 | .fake_shstrtab : { *(.fake_shstrtab) } :text | |
75 | ||
f6b46ebf | 76 | |
0e3727a8 AL |
77 | .note : { *(.note.*) } :text :note |
78 | ||
79 | .eh_frame_hdr : { *(.eh_frame_hdr) } :text :eh_frame_hdr | |
80 | .eh_frame : { KEEP (*(.eh_frame)) } :text | |
81 | ||
f6b46ebf RM |
82 | |
83 | /* | |
0e3727a8 AL |
84 | * Text is well-separated from actual data: there's plenty of |
85 | * stuff that isn't used at runtime in between. | |
f6b46ebf | 86 | */ |
f6b46ebf | 87 | |
378ed3cc AL |
88 | .text : { *(.text*) } :text =0x90909090, |
89 | ||
0e3727a8 AL |
90 | /* |
91 | * At the end so that eu-elflint stays happy when vdso2c strips | |
92 | * these. A better implementation would avoid allocating space | |
93 | * for these. | |
94 | */ | |
95 | .altinstructions : { *(.altinstructions) } :text | |
96 | .altinstr_replacement : { *(.altinstr_replacement) } :text | |
97 | ||
26f5ef2e PA |
98 | /DISCARD/ : { |
99 | *(.discard) | |
100 | *(.discard.*) | |
5f56e716 | 101 | *(__bug_table) |
26f5ef2e | 102 | } |
f6b46ebf RM |
103 | } |
104 | ||
105 | /* | |
106 | * Very old versions of ld do not recognize this name token; use the constant. | |
107 | */ | |
108 | #define PT_GNU_EH_FRAME 0x6474e550 | |
109 | ||
110 | /* | |
111 | * We must supply the ELF program headers explicitly to get just one | |
112 | * PT_LOAD segment, and set the flags explicitly to make segments read-only. | |
113 | */ | |
114 | PHDRS | |
115 | { | |
116 | text PT_LOAD FLAGS(5) FILEHDR PHDRS; /* PF_R|PF_X */ | |
117 | dynamic PT_DYNAMIC FLAGS(4); /* PF_R */ | |
118 | note PT_NOTE FLAGS(4); /* PF_R */ | |
119 | eh_frame_hdr PT_GNU_EH_FRAME; | |
120 | } |