xref: /linux/arch/sh/kernel/vsyscall/vsyscall.lds.S (revision ca55b2fef3a9373fcfc30f82fd26bc7fccbda732) 
1/*
2 * Linker script for vsyscall DSO.  The vsyscall page is an ELF shared
3 * object prelinked to its virtual address, and with only one read-only
4 * segment (that fits in one page).  This script controls its layout.
5 */
6#include <asm/asm-offsets.h>
7
8#ifdef CONFIG_CPU_LITTLE_ENDIAN
9OUTPUT_FORMAT("elf32-sh-linux", "elf32-sh-linux", "elf32-sh-linux")
10#else
11OUTPUT_FORMAT("elf32-shbig-linux", "elf32-shbig-linux", "elf32-shbig-linux")
12#endif
13OUTPUT_ARCH(sh)
14
15/* The ELF entry point can be used to set the AT_SYSINFO value.  */
16ENTRY(__kernel_vsyscall);
17
18SECTIONS
19{
20	. = SIZEOF_HEADERS;
21
22	.hash		: { *(.hash) }			:text
23	.gnu.hash	: { *(.gnu.hash) }
24	.dynsym		: { *(.dynsym) }
25	.dynstr		: { *(.dynstr) }
26	.gnu.version	: { *(.gnu.version) }
27	.gnu.version_d	: { *(.gnu.version_d) }
28	.gnu.version_r	: { *(.gnu.version_r) }
29
30	/*
31	 * This linker script is used both with -r and with -shared.
32	 * For the layouts to match, we need to skip more than enough
33	 * space for the dynamic symbol table et al.  If this amount
34	 * is insufficient, ld -shared will barf.  Just increase it here.
35	 */
36	. = 0x400;
37
38	.text		: { *(.text) } 			:text	=0x90909090
39	.note		: { *(.note.*) }		:text	:note
40	.eh_frame_hdr	: { *(.eh_frame_hdr ) }		:text	:eh_frame_hdr
41	.eh_frame	: {
42		KEEP (*(.eh_frame))
43		LONG (0)
44	}						:text
45	.dynamic	: { *(.dynamic) }		:text	:dynamic
46	.useless	: {
47	      *(.got.plt) *(.got)
48	      *(.data .data.* .gnu.linkonce.d.*)
49	      *(.dynbss)
50	      *(.bss .bss.* .gnu.linkonce.b.*)
51	}						:text
52}
53
54/*
55 * Very old versions of ld do not recognize this name token; use the constant.
56 */
57#define PT_GNU_EH_FRAME	0x6474e550
58
59/*
60 * We must supply the ELF program headers explicitly to get just one
61 * PT_LOAD segment, and set the flags explicitly to make segments read-only.
62 */
63PHDRS
64{
65	text		PT_LOAD FILEHDR PHDRS FLAGS(5);	/* PF_R|PF_X */
66	dynamic		PT_DYNAMIC FLAGS(4);		/* PF_R */
67	note		PT_NOTE FLAGS(4);		/* PF_R */
68	eh_frame_hdr	PT_GNU_EH_FRAME;
69}
70
71/*
72 * This controls what symbols we export from the DSO.
73 */
74VERSION
75{
76	LINUX_2.6 {
77	global:
78		__kernel_vsyscall;
79		__kernel_sigreturn;
80		__kernel_rt_sigreturn;
81
82	local: *;
83	};
84}
85