aboutsummaryrefslogtreecommitdiff
path: root/arch/x86/kernel/vmlinux.lds.S
blob: 4c85b2e2bb652873da1ee5367549e070b363bf8a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
/*
 * ld script for the x86 kernel
 *
 * Historic 32-bit version written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>
 *
 * Modernisation, unification and other changes and fixes:
 *   Copyright (C) 2007-2009  Sam Ravnborg <sam@ravnborg.org>
 *
 *
 * Don't define absolute symbols until and unless you know that symbol
 * value is should remain constant even if kernel image is relocated
 * at run time. Absolute symbols are not relocated. If symbol value should
 * change if kernel is relocated, make the symbol section relative and
 * put it inside the section definition.
 */

#ifdef CONFIG_X86_32
#define LOAD_OFFSET __PAGE_OFFSET
#else
#define LOAD_OFFSET __START_KERNEL_map
#endif

#include <asm-generic/vmlinux.lds.h>
#include <asm/asm-offsets.h>
#include <asm/thread_info.h>
#include <asm/page_types.h>
#include <asm/cache.h>
#include <asm/boot.h>

#undef i386     /* in case the preprocessor is a 32bit one */

OUTPUT_FORMAT(CONFIG_OUTPUT_FORMAT, CONFIG_OUTPUT_FORMAT, CONFIG_OUTPUT_FORMAT)

#ifdef CONFIG_X86_32
OUTPUT_ARCH(i386)
ENTRY(phys_startup_32)
jiffies = jiffies_64;
#else
OUTPUT_ARCH(i386:x86-64)
ENTRY(phys_startup_64)
jiffies_64 = jiffies;
#endif

PHDRS {
	text PT_LOAD FLAGS(5);          /* R_E */
	data PT_LOAD FLAGS(7);          /* RWE */
#ifdef CONFIG_X86_64
	user PT_LOAD FLAGS(7);          /* RWE */
	data.init PT_LOAD FLAGS(7);     /* RWE */
#ifdef CONFIG_SMP
	percpu PT_LOAD FLAGS(7);        /* RWE */
#endif
	data.init2 PT_LOAD FLAGS(7);    /* RWE */
#endif
	note PT_NOTE FLAGS(0);          /* ___ */
}

SECTIONS
{
#ifdef CONFIG_X86_32
        . = LOAD_OFFSET + LOAD_PHYSICAL_ADDR;
        phys_startup_32 = startup_32 - LOAD_OFFSET;
#else
        . = __START_KERNEL;
        phys_startup_64 = startup_64 - LOAD_OFFSET;
#endif

	/* Text and read-only data */

	/* bootstrapping code */
	.text.head : AT(ADDR(.text.head) - LOAD_OFFSET) {
		_text = .;
		*(.text.head)
	} :text = 0x9090

	/* The rest of the text */
	.text :  AT(ADDR(.text) - LOAD_OFFSET) {
#ifdef CONFIG_X86_32
		/* not really needed, already page aligned */
		. = ALIGN(PAGE_SIZE);
		*(.text.page_aligned)
#endif
		. = ALIGN(8);
		_stext = .;
		TEXT_TEXT
		SCHED_TEXT
		LOCK_TEXT
		KPROBES_TEXT
		IRQENTRY_TEXT
		*(.fixup)
		*(.gnu.warning)
		/* End of text section */
		_etext = .;
	} :text = 0x9090

	NOTES :text :note

	/* Exception table */
	. = ALIGN(16);
	__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
		__start___ex_table = .;
		*(__ex_table)
		__stop___ex_table = .;
	} :text = 0x9090

	RODATA

	/* Data */
	. = ALIGN(PAGE_SIZE);
	.data : AT(ADDR(.data) - LOAD_OFFSET) {
		DATA_DATA
		CONSTRUCTORS

#ifdef CONFIG_X86_64
		/* End of data section */
		_edata = .;
#endif
	} :data

#ifdef CONFIG_X86_32
	/* 32 bit has nosave before _edata */
	. = ALIGN(PAGE_SIZE);
	.data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
		__nosave_begin = .;
		*(.data.nosave)
		. = ALIGN(PAGE_SIZE);
		__nosave_end = .;
	}
#endif

	. = ALIGN(PAGE_SIZE);
	.data.page_aligned : AT(ADDR(.data.page_aligned) - LOAD_OFFSET) {
		*(.data.page_aligned)
		*(.data.idt)
	}

#ifdef CONFIG_X86_32
	. = ALIGN(32);
#else
	. = ALIGN(PAGE_SIZE);
	. = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
#endif
	.data.cacheline_aligned :
		AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET) {
		*(.data.cacheline_aligned)
	}

	/* rarely changed data like cpu maps */
#ifdef CONFIG_X86_32
	. = ALIGN(32);
#else
	. = ALIGN(CONFIG_X86_INTERNODE_CACHE_BYTES);
#endif
	.data.read_mostly : AT(ADDR(.data.read_mostly) - LOAD_OFFSET) {
		*(.data.read_mostly)

#ifdef CONFIG_X86_32
		/* End of data section */
		_edata = .;
#endif
	}

#ifdef CONFIG_X86_64

#define VSYSCALL_ADDR (-10*1024*1024)
#define VSYSCALL_PHYS_ADDR ((LOADADDR(.data.read_mostly) + \
                            SIZEOF(.data.read_mostly) + 4095) & ~(4095))
#define VSYSCALL_VIRT_ADDR ((ADDR(.data.read_mostly) + \
                            SIZEOF(.data.read_mostly) + 4095) & ~(4095))

#define VLOAD_OFFSET (VSYSCALL_ADDR - VSYSCALL_PHYS_ADDR)
#define VLOAD(x) (ADDR(x) - VLOAD_OFFSET)

#define VVIRT_OFFSET (VSYSCALL_ADDR - VSYSCALL_VIRT_ADDR)
#define VVIRT(x) (ADDR(x) - VVIRT_OFFSET)

	. = VSYSCALL_ADDR;
	.vsyscall_0 : AT(VSYSCALL_PHYS_ADDR) {
		*(.vsyscall_0)
	} :user

	__vsyscall_0 = VSYSCALL_VIRT_ADDR;

	. = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
	.vsyscall_fn : AT(VLOAD(.vsyscall_fn)) {
		*(.vsyscall_fn)
	}

	. = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
	.vsyscall_gtod_data : AT(VLOAD(.vsyscall_gtod_data)) {
		*(.vsyscall_gtod_data)
	}

	vsyscall_gtod_data = VVIRT(.vsyscall_gtod_data);
	.vsyscall_clock : AT(VLOAD(.vsyscall_clock)) {
		*(.vsyscall_clock)
	}
	vsyscall_clock = VVIRT(.vsyscall_clock);


	.vsyscall_1 ADDR(.vsyscall_0) + 1024: AT(VLOAD(.vsyscall_1)) {
		*(.vsyscall_1)
	}
	.vsyscall_2 ADDR(.vsyscall_0) + 2048: AT(VLOAD(.vsyscall_2)) {
		*(.vsyscall_2)
	}

	.vgetcpu_mode : AT(VLOAD(.vgetcpu_mode)) {
		*(.vgetcpu_mode)
	}
	vgetcpu_mode = VVIRT(.vgetcpu_mode);

	. = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
	.jiffies : AT(VLOAD(.jiffies)) {
		*(.jiffies)
	}
	jiffies = VVIRT(.jiffies);

	.vsyscall_3 ADDR(.vsyscall_0) + 3072: AT(VLOAD(.vsyscall_3)) {
		*(.vsyscall_3)
	}

	. = VSYSCALL_VIRT_ADDR + PAGE_SIZE;

#undef VSYSCALL_ADDR
#undef VSYSCALL_PHYS_ADDR
#undef VSYSCALL_VIRT_ADDR
#undef VLOAD_OFFSET
#undef VLOAD
#undef VVIRT_OFFSET
#undef VVIRT

#endif /* CONFIG_X86_64 */

	/* init_task */
	. = ALIGN(THREAD_SIZE);
	.data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {
		*(.data.init_task)
	}
#ifdef CONFIG_X86_64
	 :data.init
#endif

	/*
	 * smp_locks might be freed after init
	 * start/end must be page aligned
	 */
	. = ALIGN(PAGE_SIZE);
	.smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) {
		__smp_locks = .;
		*(.smp_locks)
		__smp_locks_end = .;
		. = ALIGN(PAGE_SIZE);
	}

	/* Init code and data - will be freed after init */
	. = ALIGN(PAGE_SIZE);
	.init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
		__init_begin = .; /* paired with __init_end */
		_sinittext = .;
		INIT_TEXT
		_einittext = .;
	}

	.init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {
		INIT_DATA
	}

	. = ALIGN(16);
	.init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) {
		__setup_start = .;
		*(.init.setup)
		__setup_end = .;
	}
	.initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
		__initcall_start = .;
		INITCALLS
		__initcall_end = .;
	}

	.con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
		__con_initcall_start = .;
		*(.con_initcall.init)
		__con_initcall_end = .;
	}

	.x86_cpu_dev.init : AT(ADDR(.x86_cpu_dev.init) - LOAD_OFFSET) {
		__x86_cpu_dev_start = .;
		*(.x86_cpu_dev.init)
		__x86_cpu_dev_end = .;
	}

	SECURITY_INIT

	. = ALIGN(8);
	.parainstructions : AT(ADDR(.parainstructions) - LOAD_OFFSET) {
		__parainstructions = .;
		*(.parainstructions)
		__parainstructions_end = .;
	}

	. = ALIGN(8);
	.altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {
		__alt_instructions = .;
		*(.altinstructions)
		__alt_instructions_end = .;
	}

	.altinstr_replacement : AT(ADDR(.altinstr_replacement) - LOAD_OFFSET) {
		*(.altinstr_replacement)
	}

	/*
	 * .exit.text is discard at runtime, not link time, to deal with
	 *  references from .altinstructions and .eh_frame
	 */
	.exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) {
		EXIT_TEXT
	}

	.exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) {
		EXIT_DATA
	}

#ifdef CONFIG_BLK_DEV_INITRD
	. = ALIGN(PAGE_SIZE);
	.init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) {
		__initramfs_start = .;
		*(.init.ramfs)
		__initramfs_end = .;
	}
#endif

#if defined(CONFIG_X86_64) && defined(CONFIG_SMP)
	/*
	 * percpu offsets are zero-based on SMP.  PERCPU_VADDR() changes the
	 * output PHDR, so the next output section - __data_nosave - should
	 * start another section data.init2.  Also, pda should be at the head of
	 * percpu area.  Preallocate it and define the percpu offset symbol
	 * so that it can be accessed as a percpu variable.
	 */
	. = ALIGN(PAGE_SIZE);
	PERCPU_VADDR(0, :percpu)
#else
	PERCPU(PAGE_SIZE)
#endif

	. = ALIGN(PAGE_SIZE);

	/* freed after init ends here */
	.init.end : AT(ADDR(.init.end) - LOAD_OFFSET) {
		__init_end = .;
	}

#ifdef CONFIG_X86_64
	.data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
		. = ALIGN(PAGE_SIZE);
		__nosave_begin = .;
		*(.data.nosave)
		. = ALIGN(PAGE_SIZE);
		__nosave_end = .;
	} :data.init2
	/* use another section data.init2, see PERCPU_VADDR() above */
#endif

	/* BSS */
	. = ALIGN(PAGE_SIZE);
	.bss : AT(ADDR(.bss) - LOAD_OFFSET) {
		__bss_start = .;
		*(.bss.page_aligned)
		*(.bss)
		. = ALIGN(4);
		__bss_stop = .;
	}

	. = ALIGN(PAGE_SIZE);
	.brk : AT(ADDR(.brk) - LOAD_OFFSET) {
		__brk_base = .;
		. += 64 * 1024;		/* 64k alignment slop space */
		*(.brk_reservation)	/* areas brk users have reserved */
		__brk_limit = .;
	}

	.end : AT(ADDR(.end) - LOAD_OFFSET) {
		_end = .;
	}

	/* Sections to be discarded */
	/DISCARD/ : {
		*(.exitcall.exit)
		*(.eh_frame)
		*(.discard)
	}

        STABS_DEBUG
        DWARF_DEBUG
}


#ifdef CONFIG_X86_32
ASSERT((_end - LOAD_OFFSET <= KERNEL_IMAGE_SIZE),
        "kernel image bigger than KERNEL_IMAGE_SIZE")
#else
/*
 * Per-cpu symbols which need to be offset from __per_cpu_load
 * for the boot processor.
 */
#define INIT_PER_CPU(x) init_per_cpu__##x = per_cpu__##x + __per_cpu_load
INIT_PER_CPU(gdt_page);
INIT_PER_CPU(irq_stack_union);

/*
 * Build-time check on the image size:
 */
ASSERT((_end - _text <= KERNEL_IMAGE_SIZE),
	"kernel image bigger than KERNEL_IMAGE_SIZE")

#ifdef CONFIG_SMP
ASSERT((per_cpu__irq_stack_union == 0),
        "irq_stack_union is not at start of per-cpu area");
#endif

#endif /* CONFIG_X86_32 */

#ifdef CONFIG_KEXEC
#include <asm/kexec.h>

ASSERT(kexec_control_code_size <= KEXEC_CONTROL_CODE_MAX_SIZE,
       "kexec control code size is too big")
#endif