1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Linker script for vsyscall DSO. The vsyscall page is an ELF shared
4 * object prelinked to its virtual address, and with only one read-only
5 * segment (that fits in one page). This script controls its layout.
6 */
7 #include <asm/asm-offsets.h>
8
9 #ifdef CONFIG_CPU_LITTLE_ENDIAN
10 OUTPUT_FORMAT("elf32-sh-linux", "elf32-sh-linux", "elf32-sh-linux")
11 #else
12 OUTPUT_FORMAT("elf32-shbig-linux", "elf32-shbig-linux", "elf32-shbig-linux")
13 #endif
14 OUTPUT_ARCH(sh)
15
16 /* The ELF entry point can be used to set the AT_SYSINFO value. */
17 ENTRY(__kernel_vsyscall);
18
19 SECTIONS
20 {
21 . = SIZEOF_HEADERS;
22
23 .hash : { *(.hash) } :text
24 .gnu.hash : { *(.gnu.hash) }
25 .dynsym : { *(.dynsym) }
26 .dynstr : { *(.dynstr) }
27 .gnu.version : { *(.gnu.version) }
28 .gnu.version_d : { *(.gnu.version_d) }
29 .gnu.version_r : { *(.gnu.version_r) }
30
31 /*
32 * This linker script is used both with -r and with -shared.
33 * For the layouts to match, we need to skip more than enough
34 * space for the dynamic symbol table et al. If this amount
35 * is insufficient, ld -shared will barf. Just increase it here.
36 */
37 . = 0x400;
38
39 .text : { *(.text) } :text =0x90909090
40 .note : { *(.note.*) } :text :note
41 .eh_frame_hdr : { *(.eh_frame_hdr ) } :text :eh_frame_hdr
42 .eh_frame : {
43 KEEP (*(.eh_frame))
44 LONG (0)
45 } :text
46 .dynamic : { *(.dynamic) } :text :dynamic
47 .useless : {
48 *(.got.plt) *(.got)
49 *(.data .data.* .gnu.linkonce.d.*)
50 *(.dynbss)
51 *(.bss .bss.* .gnu.linkonce.b.*)
52 } :text
53 }
54
55 /*
56 * Very old versions of ld do not recognize this name token; use the constant.
57 */
58 #define PT_GNU_EH_FRAME 0x6474e550
59
60 /*
61 * We must supply the ELF program headers explicitly to get just one
62 * PT_LOAD segment, and set the flags explicitly to make segments read-only.
63 */
64 PHDRS
65 {
66 text PT_LOAD FILEHDR PHDRS FLAGS(5); /* PF_R|PF_X */
67 dynamic PT_DYNAMIC FLAGS(4); /* PF_R */
68 note PT_NOTE FLAGS(4); /* PF_R */
69 eh_frame_hdr PT_GNU_EH_FRAME;
70 }
71
72 /*
73 * This controls what symbols we export from the DSO.
74 */
75 VERSION
76 {
77 LINUX_2.6 {
78 global:
79 __kernel_vsyscall;
80 __kernel_sigreturn;
81 __kernel_rt_sigreturn;
82
83 local: *;
84 };
85 }
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