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Thomas Gleixnera60b7782007-10-11 11:12:11 +02001/* ld script to make i386 Linux kernel
2 * Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>;
3 *
4 * Don't define absolute symbols until and unless you know that symbol
5 * value is should remain constant even if kernel image is relocated
6 * at run time. Absolute symbols are not relocated. If symbol value should
7 * change if kernel is relocated, make the symbol section relative and
8 * put it inside the section definition.
9 */
10
Thomas Gleixnera60b7782007-10-11 11:12:11 +020011#define LOAD_OFFSET __PAGE_OFFSET
12
13#include <asm-generic/vmlinux.lds.h>
14#include <asm/thread_info.h>
Jeremy Fitzhardinge0341c142009-02-13 11:14:01 -080015#include <asm/page_types.h>
Thomas Gleixnera60b7782007-10-11 11:12:11 +020016#include <asm/cache.h>
17#include <asm/boot.h>
18
19OUTPUT_FORMAT("elf32-i386", "elf32-i386", "elf32-i386")
20OUTPUT_ARCH(i386)
21ENTRY(phys_startup_32)
22jiffies = jiffies_64;
23
24PHDRS {
25 text PT_LOAD FLAGS(5); /* R_E */
26 data PT_LOAD FLAGS(7); /* RWE */
27 note PT_NOTE FLAGS(0); /* ___ */
28}
29SECTIONS
30{
31 . = LOAD_OFFSET + LOAD_PHYSICAL_ADDR;
32 phys_startup_32 = startup_32 - LOAD_OFFSET;
33
34 .text.head : AT(ADDR(.text.head) - LOAD_OFFSET) {
35 _text = .; /* Text and read-only data */
36 *(.text.head)
37 } :text = 0x9090
38
39 /* read-only */
40 .text : AT(ADDR(.text) - LOAD_OFFSET) {
Cyrill Gorcunov3cdac412008-02-17 18:17:17 +030041 . = ALIGN(PAGE_SIZE); /* not really needed, already page aligned */
Eric Dumazet4c491562008-01-30 13:32:50 +010042 *(.text.page_aligned)
Thomas Gleixnera60b7782007-10-11 11:12:11 +020043 TEXT_TEXT
44 SCHED_TEXT
45 LOCK_TEXT
46 KPROBES_TEXT
Ingo Molnar2bed8442008-12-12 12:13:36 +010047 IRQENTRY_TEXT
Thomas Gleixnera60b7782007-10-11 11:12:11 +020048 *(.fixup)
49 *(.gnu.warning)
50 _etext = .; /* End of text section */
51 } :text = 0x9090
52
Jan Beulich6360b1f2008-05-12 15:44:41 +020053 NOTES :text :note
54
Thomas Gleixnera60b7782007-10-11 11:12:11 +020055 . = ALIGN(16); /* Exception table */
56 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
57 __start___ex_table = .;
58 *(__ex_table)
59 __stop___ex_table = .;
Jan Beulich6360b1f2008-05-12 15:44:41 +020060 } :text = 0x9090
Thomas Gleixnera60b7782007-10-11 11:12:11 +020061
Thomas Gleixnera60b7782007-10-11 11:12:11 +020062 RODATA
63
64 /* writeable */
Cyrill Gorcunov3cdac412008-02-17 18:17:17 +030065 . = ALIGN(PAGE_SIZE);
Thomas Gleixnera60b7782007-10-11 11:12:11 +020066 .data : AT(ADDR(.data) - LOAD_OFFSET) { /* Data */
67 DATA_DATA
68 CONSTRUCTORS
69 } :data
70
Cyrill Gorcunov3cdac412008-02-17 18:17:17 +030071 . = ALIGN(PAGE_SIZE);
Thomas Gleixnera60b7782007-10-11 11:12:11 +020072 .data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
73 __nosave_begin = .;
74 *(.data.nosave)
Cyrill Gorcunov3cdac412008-02-17 18:17:17 +030075 . = ALIGN(PAGE_SIZE);
Thomas Gleixnera60b7782007-10-11 11:12:11 +020076 __nosave_end = .;
77 }
78
Cyrill Gorcunov3cdac412008-02-17 18:17:17 +030079 . = ALIGN(PAGE_SIZE);
Thomas Gleixnera60b7782007-10-11 11:12:11 +020080 .data.page_aligned : AT(ADDR(.data.page_aligned) - LOAD_OFFSET) {
81 *(.data.page_aligned)
82 *(.data.idt)
83 }
84
85 . = ALIGN(32);
86 .data.cacheline_aligned : AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET) {
87 *(.data.cacheline_aligned)
88 }
89
90 /* rarely changed data like cpu maps */
91 . = ALIGN(32);
92 .data.read_mostly : AT(ADDR(.data.read_mostly) - LOAD_OFFSET) {
93 *(.data.read_mostly)
94 _edata = .; /* End of data section */
95 }
96
97 . = ALIGN(THREAD_SIZE); /* init_task */
98 .data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {
99 *(.data.init_task)
100 }
101
102 /* might get freed after init */
Cyrill Gorcunov3cdac412008-02-17 18:17:17 +0300103 . = ALIGN(PAGE_SIZE);
Thomas Gleixnera60b7782007-10-11 11:12:11 +0200104 .smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) {
105 __smp_locks = .;
106 *(.smp_locks)
107 __smp_locks_end = .;
108 }
109 /* will be freed after init
110 * Following ALIGN() is required to make sure no other data falls on the
111 * same page where __smp_alt_end is pointing as that page might be freed
112 * after boot. Always make sure that ALIGN() directive is present after
113 * the section which contains __smp_alt_end.
114 */
Cyrill Gorcunov3cdac412008-02-17 18:17:17 +0300115 . = ALIGN(PAGE_SIZE);
Thomas Gleixnera60b7782007-10-11 11:12:11 +0200116
117 /* will be freed after init */
Cyrill Gorcunov3cdac412008-02-17 18:17:17 +0300118 . = ALIGN(PAGE_SIZE); /* Init code and data */
Thomas Gleixnera60b7782007-10-11 11:12:11 +0200119 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
120 __init_begin = .;
121 _sinittext = .;
Sam Ravnborg01ba2bd2008-01-20 14:15:03 +0100122 INIT_TEXT
Thomas Gleixnera60b7782007-10-11 11:12:11 +0200123 _einittext = .;
124 }
Sam Ravnborg01ba2bd2008-01-20 14:15:03 +0100125 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {
126 INIT_DATA
127 }
Thomas Gleixnera60b7782007-10-11 11:12:11 +0200128 . = ALIGN(16);
129 .init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) {
130 __setup_start = .;
131 *(.init.setup)
132 __setup_end = .;
133 }
134 .initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
135 __initcall_start = .;
136 INITCALLS
137 __initcall_end = .;
138 }
139 .con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
140 __con_initcall_start = .;
141 *(.con_initcall.init)
142 __con_initcall_end = .;
143 }
Yinghai Lu10a434f2008-09-04 21:09:45 +0200144 .x86_cpu_dev.init : AT(ADDR(.x86_cpu_dev.init) - LOAD_OFFSET) {
145 __x86_cpu_dev_start = .;
146 *(.x86_cpu_dev.init)
147 __x86_cpu_dev_end = .;
Thomas Petazzoni03ae5762008-02-15 12:00:23 +0100148 }
Thomas Gleixnera60b7782007-10-11 11:12:11 +0200149 SECURITY_INIT
150 . = ALIGN(4);
151 .altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {
152 __alt_instructions = .;
153 *(.altinstructions)
154 __alt_instructions_end = .;
155 }
156 .altinstr_replacement : AT(ADDR(.altinstr_replacement) - LOAD_OFFSET) {
157 *(.altinstr_replacement)
158 }
159 . = ALIGN(4);
160 .parainstructions : AT(ADDR(.parainstructions) - LOAD_OFFSET) {
161 __parainstructions = .;
162 *(.parainstructions)
163 __parainstructions_end = .;
164 }
165 /* .exit.text is discard at runtime, not link time, to deal with references
166 from .altinstructions and .eh_frame */
Sam Ravnborg01ba2bd2008-01-20 14:15:03 +0100167 .exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) {
168 EXIT_TEXT
169 }
170 .exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) {
171 EXIT_DATA
172 }
Thomas Gleixnera60b7782007-10-11 11:12:11 +0200173#if defined(CONFIG_BLK_DEV_INITRD)
Cyrill Gorcunov3cdac412008-02-17 18:17:17 +0300174 . = ALIGN(PAGE_SIZE);
Thomas Gleixnera60b7782007-10-11 11:12:11 +0200175 .init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) {
176 __initramfs_start = .;
177 *(.init.ramfs)
178 __initramfs_end = .;
179 }
180#endif
Tejun Heoa698c822009-01-13 20:41:35 +0900181 PERCPU(PAGE_SIZE)
Cyrill Gorcunov3cdac412008-02-17 18:17:17 +0300182 . = ALIGN(PAGE_SIZE);
Thomas Gleixnera60b7782007-10-11 11:12:11 +0200183 /* freed after init ends here */
Cyrill Gorcunov3cdac412008-02-17 18:17:17 +0300184
Thomas Gleixnera60b7782007-10-11 11:12:11 +0200185 .bss : AT(ADDR(.bss) - LOAD_OFFSET) {
186 __init_end = .;
187 __bss_start = .; /* BSS */
188 *(.bss.page_aligned)
189 *(.bss)
190 . = ALIGN(4);
191 __bss_stop = .;
Jeremy Fitzhardinge704439d2009-03-14 23:20:47 -0700192 }
Jeremy Fitzhardinge93dbda72009-02-26 17:35:44 -0800193
Jeremy Fitzhardinge704439d2009-03-14 23:20:47 -0700194 .brk : AT(ADDR(.brk) - LOAD_OFFSET) {
Jeremy Fitzhardinge93dbda72009-02-26 17:35:44 -0800195 . = ALIGN(PAGE_SIZE);
196 __brk_base = . ;
Jeremy Fitzhardinge704439d2009-03-14 23:20:47 -0700197 . += 64 * 1024 ; /* 64k alignment slop space */
Jeremy Fitzhardinge796216a2009-03-12 16:09:49 -0700198 *(.brk_reservation) /* areas brk users have reserved */
Jeremy Fitzhardinge93dbda72009-02-26 17:35:44 -0800199 __brk_limit = . ;
Thomas Gleixnera60b7782007-10-11 11:12:11 +0200200 }
201
H. Peter Anvin0a699af2009-03-17 14:14:31 -0700202 .end : AT(ADDR(.end) - LOAD_OFFSET) {
203 _end = . ;
204 }
Jeremy Fitzhardinge704439d2009-03-14 23:20:47 -0700205
Thomas Gleixnera60b7782007-10-11 11:12:11 +0200206 /* Sections to be discarded */
207 /DISCARD/ : {
208 *(.exitcall.exit)
Jeremy Fitzhardinge796216a2009-03-12 16:09:49 -0700209 *(.discard)
Thomas Gleixnera60b7782007-10-11 11:12:11 +0200210 }
211
212 STABS_DEBUG
213
214 DWARF_DEBUG
215}
Huang Yingfb45daa2008-08-15 00:40:23 -0700216
Yinghai Lu2bd27532009-03-09 01:15:57 -0700217/*
218 * Build-time check on the image size:
219 */
220ASSERT((_end - LOAD_OFFSET <= KERNEL_IMAGE_SIZE),
221 "kernel image bigger than KERNEL_IMAGE_SIZE")
222
Huang Yingfb45daa2008-08-15 00:40:23 -0700223#ifdef CONFIG_KEXEC
224/* Link time checks */
225#include <asm/kexec.h>
226
227ASSERT(kexec_control_code_size <= KEXEC_CONTROL_CODE_MAX_SIZE,
228 "kexec control code size is too big")
229#endif