summaryrefslogtreecommitdiff
path: root/arch/arm64/kernel/vmlinux.lds.S
blob: 755a22d4f840c43fc30868f956632cd685a7023e (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
/* SPDX-License-Identifier: GPL-2.0 */
/*
 * ld script to make ARM Linux kernel
 * taken from the i386 version by Russell King
 * Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>
 */

#include <asm/hyp_image.h>
#ifdef CONFIG_KVM
#define HYPERVISOR_EXTABLE					\
	. = ALIGN(SZ_8);					\
	__start___kvm_ex_table = .;				\
	*(__kvm_ex_table)					\
	__stop___kvm_ex_table = .;

#define HYPERVISOR_DATA_SECTIONS				\
	HYP_SECTION_NAME(.rodata) : {				\
		. = ALIGN(PAGE_SIZE);				\
		__hyp_rodata_start = .;				\
		*(HYP_SECTION_NAME(.data..ro_after_init))	\
		*(HYP_SECTION_NAME(.rodata))			\
		. = ALIGN(PAGE_SIZE);				\
		__hyp_rodata_end = .;				\
	}

#define HYPERVISOR_PERCPU_SECTION				\
	. = ALIGN(PAGE_SIZE);					\
	HYP_SECTION_NAME(.data..percpu) : {			\
		*(HYP_SECTION_NAME(.data..percpu))		\
	}

#define HYPERVISOR_RELOC_SECTION				\
	.hyp.reloc : ALIGN(4) {					\
		__hyp_reloc_begin = .;				\
		*(.hyp.reloc)					\
		__hyp_reloc_end = .;				\
	}

#define BSS_FIRST_SECTIONS					\
	__hyp_bss_start = .;					\
	*(HYP_SECTION_NAME(.bss))				\
	. = ALIGN(PAGE_SIZE);					\
	__hyp_bss_end = .;

/*
 * We require that __hyp_bss_start and __bss_start are aligned, and enforce it
 * with an assertion. But the BSS_SECTION macro places an empty .sbss section
 * between them, which can in some cases cause the linker to misalign them. To
 * work around the issue, force a page alignment for __bss_start.
 */
#define SBSS_ALIGN			PAGE_SIZE
#else /* CONFIG_KVM */
#define HYPERVISOR_EXTABLE
#define HYPERVISOR_DATA_SECTIONS
#define HYPERVISOR_PERCPU_SECTION
#define HYPERVISOR_RELOC_SECTION
#define SBSS_ALIGN			0
#endif

#define RO_EXCEPTION_TABLE_ALIGN	4
#define RUNTIME_DISCARD_EXIT

#include <asm-generic/vmlinux.lds.h>
#include <asm/cache.h>
#include <asm/kernel-pgtable.h>
#include <asm/kexec.h>
#include <asm/memory.h>
#include <asm/page.h>

#include "image.h"

OUTPUT_ARCH(aarch64)
ENTRY(_text)

jiffies = jiffies_64;

#define HYPERVISOR_TEXT					\
	. = ALIGN(PAGE_SIZE);				\
	__hyp_idmap_text_start = .;			\
	*(.hyp.idmap.text)				\
	__hyp_idmap_text_end = .;			\
	__hyp_text_start = .;				\
	*(.hyp.text)					\
	HYPERVISOR_EXTABLE				\
	. = ALIGN(PAGE_SIZE);				\
	__hyp_text_end = .;

#define IDMAP_TEXT					\
	. = ALIGN(SZ_4K);				\
	__idmap_text_start = .;				\
	*(.idmap.text)					\
	__idmap_text_end = .;

#ifdef CONFIG_HIBERNATION
#define HIBERNATE_TEXT					\
	ALIGN_FUNCTION();				\
	__hibernate_exit_text_start = .;		\
	*(.hibernate_exit.text)				\
	__hibernate_exit_text_end = .;
#else
#define HIBERNATE_TEXT
#endif

#ifdef CONFIG_KEXEC_CORE
#define KEXEC_TEXT					\
	ALIGN_FUNCTION();				\
	__relocate_new_kernel_start = .;		\
	*(.kexec_relocate.text)				\
	__relocate_new_kernel_end = .;
#else
#define KEXEC_TEXT
#endif

#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
#define TRAMP_TEXT					\
	. = ALIGN(PAGE_SIZE);				\
	__entry_tramp_text_start = .;			\
	*(.entry.tramp.text)				\
	. = ALIGN(PAGE_SIZE);				\
	__entry_tramp_text_end = .;			\
	*(.entry.tramp.rodata)
#else
#define TRAMP_TEXT
#endif

#ifdef CONFIG_UNWIND_TABLES
#define UNWIND_DATA_SECTIONS				\
	.eh_frame : {					\
		__pi___eh_frame_start = .;		\
		*(.eh_frame)				\
		__pi___eh_frame_end = .;		\
	}
#else
#define UNWIND_DATA_SECTIONS
#endif

/*
 * The size of the PE/COFF section that covers the kernel image, which
 * runs from _stext to _edata, must be a round multiple of the PE/COFF
 * FileAlignment, which we set to its minimum value of 0x200. '_stext'
 * itself is 4 KB aligned, so padding out _edata to a 0x200 aligned
 * boundary should be sufficient.
 */
PECOFF_FILE_ALIGNMENT = 0x200;

#ifdef CONFIG_EFI
#define PECOFF_EDATA_PADDING	\
	.pecoff_edata_padding : { BYTE(0); . = ALIGN(PECOFF_FILE_ALIGNMENT); }
#else
#define PECOFF_EDATA_PADDING
#endif

SECTIONS
{
	/*
	 * XXX: The linker does not define how output sections are
	 * assigned to input sections when there are multiple statements
	 * matching the same input section name.  There is no documented
	 * order of matching.
	 */
	DISCARDS
	/DISCARD/ : {
		*(.interp .dynamic)
		*(.dynsym .dynstr .hash .gnu.hash)
	}

	. = KIMAGE_VADDR;

	.head.text : {
		_text = .;
		HEAD_TEXT
	}
	.text : ALIGN(SEGMENT_ALIGN) {	/* Real text segment		*/
		_stext = .;		/* Text and read-only data	*/
			IRQENTRY_TEXT
			SOFTIRQENTRY_TEXT
			ENTRY_TEXT
			TEXT_TEXT
			SCHED_TEXT
			LOCK_TEXT
			KPROBES_TEXT
			HYPERVISOR_TEXT
			*(.gnu.warning)
	}

	. = ALIGN(SEGMENT_ALIGN);
	_etext = .;			/* End of text section */

	/* everything from this point to __init_begin will be marked RO NX */
	RO_DATA(PAGE_SIZE)

	HYPERVISOR_DATA_SECTIONS

	.got : { *(.got) }
	/*
	 * Make sure that the .got.plt is either completely empty or it
	 * contains only the lazy dispatch entries.
	 */
	.got.plt : { *(.got.plt) }
	ASSERT(SIZEOF(.got.plt) == 0 || SIZEOF(.got.plt) == 0x18,
	       "Unexpected GOT/PLT entries detected!")

	/* code sections that are never executed via the kernel mapping */
	.rodata.text : {
		TRAMP_TEXT
		HIBERNATE_TEXT
		KEXEC_TEXT
		IDMAP_TEXT
		. = ALIGN(PAGE_SIZE);
	}

	idmap_pg_dir = .;
	. += PAGE_SIZE;

#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
	tramp_pg_dir = .;
	. += PAGE_SIZE;
#endif

	reserved_pg_dir = .;
	. += PAGE_SIZE;

	swapper_pg_dir = .;
	. += PAGE_SIZE;

	. = ALIGN(SEGMENT_ALIGN);
	__init_begin = .;
	__inittext_begin = .;

	INIT_TEXT_SECTION(8)

	__exittext_begin = .;
	.exit.text : {
		EXIT_TEXT
	}
	__exittext_end = .;

	. = ALIGN(4);
	.altinstructions : {
		__alt_instructions = .;
		*(.altinstructions)
		__alt_instructions_end = .;
	}

	UNWIND_DATA_SECTIONS

	. = ALIGN(SEGMENT_ALIGN);
	__inittext_end = .;
	__initdata_begin = .;

	init_idmap_pg_dir = .;
	. += INIT_IDMAP_DIR_SIZE;
	init_idmap_pg_end = .;

	.init.data : {
		INIT_DATA
		INIT_SETUP(16)
		INIT_CALLS
		CON_INITCALL
		INIT_RAM_FS
		*(.init.altinstructions .init.bss)	/* from the EFI stub */
	}
	.exit.data : {
		EXIT_DATA
	}

	PERCPU_SECTION(L1_CACHE_BYTES)
	HYPERVISOR_PERCPU_SECTION

	HYPERVISOR_RELOC_SECTION

	.rela.dyn : ALIGN(8) {
		__pi_rela_start = .;
		*(.rela .rela*)
		__pi_rela_end = .;
	}

	.relr.dyn : ALIGN(8) {
		__pi_relr_start = .;
		*(.relr.dyn)
		__pi_relr_end = .;
	}

	. = ALIGN(SEGMENT_ALIGN);
	__initdata_end = .;
	__init_end = .;

	_data = .;
	_sdata = .;
	RW_DATA(L1_CACHE_BYTES, PAGE_SIZE, THREAD_ALIGN)

	/*
	 * Data written with the MMU off but read with the MMU on requires
	 * cache lines to be invalidated, discarding up to a Cache Writeback
	 * Granule (CWG) of data from the cache. Keep the section that
	 * requires this type of maintenance to be in its own Cache Writeback
	 * Granule (CWG) area so the cache maintenance operations don't
	 * interfere with adjacent data.
	 */
	.mmuoff.data.write : ALIGN(SZ_2K) {
		__mmuoff_data_start = .;
		*(.mmuoff.data.write)
	}
	. = ALIGN(SZ_2K);
	.mmuoff.data.read : {
		*(.mmuoff.data.read)
		__mmuoff_data_end = .;
	}

	PECOFF_EDATA_PADDING
	__pecoff_data_rawsize = ABSOLUTE(. - __initdata_begin);
	_edata = .;

	/* start of zero-init region */
	BSS_SECTION(SBSS_ALIGN, 0, 0)

	. = ALIGN(PAGE_SIZE);
	init_pg_dir = .;
	. += INIT_DIR_SIZE;
	init_pg_end = .;
	/* end of zero-init region */

	. += SZ_4K;		/* stack for the early C runtime */
	early_init_stack = .;

	. = ALIGN(SEGMENT_ALIGN);
	__pecoff_data_size = ABSOLUTE(. - __initdata_begin);
	_end = .;

	STABS_DEBUG
	DWARF_DEBUG
	ELF_DETAILS

	HEAD_SYMBOLS

	/*
	 * Sections that should stay zero sized, which is safer to
	 * explicitly check instead of blindly discarding.
	 */
	.plt : {
		*(.plt) *(.plt.*) *(.iplt) *(.igot .igot.plt)
	}
	ASSERT(SIZEOF(.plt) == 0, "Unexpected run-time procedure linkages detected!")

	.data.rel.ro : { *(.data.rel.ro) }
	ASSERT(SIZEOF(.data.rel.ro) == 0, "Unexpected RELRO detected!")
}

#include "image-vars.h"

/*
 * The HYP init code and ID map text can't be longer than a page each. The
 * former is page-aligned, but the latter may not be with 16K or 64K pages, so
 * it should also not cross a page boundary.
 */
ASSERT(__hyp_idmap_text_end - __hyp_idmap_text_start <= PAGE_SIZE,
	"HYP init code too big")
ASSERT(__idmap_text_end - (__idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K,
	"ID map text too big or misaligned")
#ifdef CONFIG_HIBERNATION
ASSERT(__hibernate_exit_text_end - __hibernate_exit_text_start <= SZ_4K,
       "Hibernate exit text is bigger than 4 KiB")
ASSERT(__hibernate_exit_text_start == swsusp_arch_suspend_exit,
       "Hibernate exit text does not start with swsusp_arch_suspend_exit")
#endif
#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
ASSERT((__entry_tramp_text_end - __entry_tramp_text_start) <= 3*PAGE_SIZE,
	"Entry trampoline text too big")
#endif
#ifdef CONFIG_KVM
ASSERT(__hyp_bss_start == __bss_start, "HYP and Host BSS are misaligned")
#endif
/*
 * If padding is applied before .head.text, virt<->phys conversions will fail.
 */
ASSERT(_text == KIMAGE_VADDR, "HEAD is misaligned")

ASSERT(swapper_pg_dir - reserved_pg_dir == RESERVED_SWAPPER_OFFSET,
       "RESERVED_SWAPPER_OFFSET is wrong!")

#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
ASSERT(swapper_pg_dir - tramp_pg_dir == TRAMP_SWAPPER_OFFSET,
       "TRAMP_SWAPPER_OFFSET is wrong!")
#endif

#ifdef CONFIG_KEXEC_CORE
/* kexec relocation code should fit into one KEXEC_CONTROL_PAGE_SIZE */
ASSERT(__relocate_new_kernel_end - __relocate_new_kernel_start <= SZ_4K,
       "kexec relocation code is bigger than 4 KiB")
ASSERT(KEXEC_CONTROL_PAGE_SIZE >= SZ_4K, "KEXEC_CONTROL_PAGE_SIZE is broken")
ASSERT(__relocate_new_kernel_start == arm64_relocate_new_kernel,
       "kexec control page does not start with arm64_relocate_new_kernel")
#endif