summaryrefslogtreecommitdiff
path: root/arch/arm/kernel/vmlinux-xip.lds.S
blob: 7a844310085e53d25d85e4e153794c46787ddd5c (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
/* 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>
 */

/* No __ro_after_init data in the .rodata section - which will always be ro */
#define RO_AFTER_INIT_DATA

#include <asm-generic/vmlinux.lds.h>
#include <asm/cache.h>
#include <asm/thread_info.h>
#include <asm/memory.h>
#include <asm/page.h>

#define PROC_INFO							\
	. = ALIGN(4);							\
	VMLINUX_SYMBOL(__proc_info_begin) = .;				\
	*(.proc.info.init)						\
	VMLINUX_SYMBOL(__proc_info_end) = .;

#define IDMAP_TEXT							\
	ALIGN_FUNCTION();						\
	VMLINUX_SYMBOL(__idmap_text_start) = .;				\
	*(.idmap.text)							\
	VMLINUX_SYMBOL(__idmap_text_end) = .;				\
	. = ALIGN(PAGE_SIZE);						\
	VMLINUX_SYMBOL(__hyp_idmap_text_start) = .;			\
	*(.hyp.idmap.text)						\
	VMLINUX_SYMBOL(__hyp_idmap_text_end) = .;

#ifdef CONFIG_HOTPLUG_CPU
#define ARM_CPU_DISCARD(x)
#define ARM_CPU_KEEP(x)		x
#else
#define ARM_CPU_DISCARD(x)	x
#define ARM_CPU_KEEP(x)
#endif

#if (defined(CONFIG_SMP_ON_UP) && !defined(CONFIG_DEBUG_SPINLOCK)) || \
	defined(CONFIG_GENERIC_BUG)
#define ARM_EXIT_KEEP(x)	x
#define ARM_EXIT_DISCARD(x)
#else
#define ARM_EXIT_KEEP(x)
#define ARM_EXIT_DISCARD(x)	x
#endif

OUTPUT_ARCH(arm)
ENTRY(stext)

#ifndef __ARMEB__
jiffies = jiffies_64;
#else
jiffies = jiffies_64 + 4;
#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.
	 *
	 * unwind exit sections must be discarded before the rest of the
	 * unwind sections get included.
	 */
	/DISCARD/ : {
		*(.ARM.exidx.exit.text)
		*(.ARM.extab.exit.text)
		ARM_CPU_DISCARD(*(.ARM.exidx.cpuexit.text))
		ARM_CPU_DISCARD(*(.ARM.extab.cpuexit.text))
		ARM_EXIT_DISCARD(EXIT_TEXT)
		ARM_EXIT_DISCARD(EXIT_DATA)
		EXIT_CALL
#ifndef CONFIG_MMU
		*(.text.fixup)
		*(__ex_table)
#endif
		*(.alt.smp.init)
		*(.discard)
		*(.discard.*)
	}

	. = XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR);
	_xiprom = .;			/* XIP ROM area to be mapped */

	.head.text : {
		_text = .;
		HEAD_TEXT
	}

	.text : {			/* Real text segment		*/
		_stext = .;		/* Text and read-only data	*/
			IDMAP_TEXT
			__exception_text_start = .;
			*(.exception.text)
			__exception_text_end = .;
			IRQENTRY_TEXT
			TEXT_TEXT
			SCHED_TEXT
			CPUIDLE_TEXT
			LOCK_TEXT
			KPROBES_TEXT
			*(.gnu.warning)
			*(.glue_7)
			*(.glue_7t)
		. = ALIGN(4);
		*(.got)			/* Global offset table		*/
			ARM_CPU_KEEP(PROC_INFO)
	}

	RO_DATA(PAGE_SIZE)

	. = ALIGN(4);
	__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
		__start___ex_table = .;
#ifdef CONFIG_MMU
		*(__ex_table)
#endif
		__stop___ex_table = .;
	}

#ifdef CONFIG_ARM_UNWIND
	/*
	 * Stack unwinding tables
	 */
	. = ALIGN(8);
	.ARM.unwind_idx : {
		__start_unwind_idx = .;
		*(.ARM.exidx*)
		__stop_unwind_idx = .;
	}
	.ARM.unwind_tab : {
		__start_unwind_tab = .;
		*(.ARM.extab*)
		__stop_unwind_tab = .;
	}
#endif

	NOTES

	_etext = .;			/* End of text and rodata section */

	/*
	 * The vectors and stubs are relocatable code, and the
	 * only thing that matters is their relative offsets
	 */
	__vectors_start = .;
	.vectors 0xffff0000 : AT(__vectors_start) {
		*(.vectors)
	}
	. = __vectors_start + SIZEOF(.vectors);
	__vectors_end = .;

	__stubs_start = .;
	.stubs ADDR(.vectors) + 0x1000 : AT(__stubs_start) {
		*(.stubs)
	}
	. = __stubs_start + SIZEOF(.stubs);
	__stubs_end = .;

	PROVIDE(vector_fiq_offset = vector_fiq - ADDR(.vectors));

	INIT_TEXT_SECTION(8)
	.exit.text : {
		ARM_EXIT_KEEP(EXIT_TEXT)
	}
	.init.proc.info : {
		ARM_CPU_DISCARD(PROC_INFO)
	}
	.init.arch.info : {
		__arch_info_begin = .;
		*(.arch.info.init)
		__arch_info_end = .;
	}
	.init.tagtable : {
		__tagtable_begin = .;
		*(.taglist.init)
		__tagtable_end = .;
	}
	.init.rodata : {
		INIT_SETUP(16)
		INIT_CALLS
		CON_INITCALL
		SECURITY_INITCALL
		INIT_RAM_FS
	}

	_exiprom = .;			/* End of XIP ROM area */

/*
 * From this point, stuff is considered writable and will be copied to RAM
 */
	__data_loc = ALIGN(4);		/* location in file */
	. = PAGE_OFFSET + TEXT_OFFSET;	/* location in memory */
#undef LOAD_OFFSET
#define LOAD_OFFSET (PAGE_OFFSET + TEXT_OFFSET - __data_loc)

	. = ALIGN(THREAD_SIZE);
	_sdata = .;
	RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE)
	.data.ro_after_init : AT(ADDR(.data.ro_after_init) - LOAD_OFFSET) {
		*(.data..ro_after_init)
	}
	_edata = .;

	. = ALIGN(PAGE_SIZE);
	__init_begin = .;
	.init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {
		INIT_DATA
	}
	.exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) {
		ARM_EXIT_KEEP(EXIT_DATA)
	}
#ifdef CONFIG_SMP
	PERCPU_SECTION(L1_CACHE_BYTES)
#endif

	/*
	 * End of copied data. We need a dummy section to get its LMA.
	 * Also located before final ALIGN() as trailing padding is not stored
	 * in the resulting binary file and useless to copy.
	 */
	.data.endmark : AT(ADDR(.data.endmark) - LOAD_OFFSET) { }
	_edata_loc = LOADADDR(.data.endmark);

	. = ALIGN(PAGE_SIZE);
	__init_end = .;

#ifdef CONFIG_HAVE_TCM
        /*
	 * We align everything to a page boundary so we can
	 * free it after init has commenced and TCM contents have
	 * been copied to its destination.
	 */
	.tcm_start : {
		. = ALIGN(PAGE_SIZE);
		__tcm_start = .;
		__itcm_start = .;
	}

	/*
	 * Link these to the ITCM RAM
	 * Put VMA to the TCM address and LMA to the common RAM
	 * and we'll upload the contents from RAM to TCM and free
	 * the used RAM after that.
	 */
	.text_itcm ITCM_OFFSET : AT(__itcm_start)
	{
		__sitcm_text = .;
		*(.tcm.text)
		*(.tcm.rodata)
		. = ALIGN(4);
		__eitcm_text = .;
	}

	/*
	 * Reset the dot pointer, this is needed to create the
	 * relative __dtcm_start below (to be used as extern in code).
	 */
	. = ADDR(.tcm_start) + SIZEOF(.tcm_start) + SIZEOF(.text_itcm);

	.dtcm_start : {
		__dtcm_start = .;
	}

	/* TODO: add remainder of ITCM as well, that can be used for data! */
	.data_dtcm DTCM_OFFSET : AT(__dtcm_start)
	{
		. = ALIGN(4);
		__sdtcm_data = .;
		*(.tcm.data)
		. = ALIGN(4);
		__edtcm_data = .;
	}

	/* Reset the dot pointer or the linker gets confused */
	. = ADDR(.dtcm_start) + SIZEOF(.data_dtcm);

	/* End marker for freeing TCM copy in linked object */
	.tcm_end : AT(ADDR(.dtcm_start) + SIZEOF(.data_dtcm)){
		. = ALIGN(PAGE_SIZE);
		__tcm_end = .;
	}
#endif

	BSS_SECTION(0, 0, 8)
	_end = .;

	STABS_DEBUG
}

/*
 * These must never be empty
 * If you have to comment these two assert statements out, your
 * binutils is too old (for other reasons as well)
 */
ASSERT((__proc_info_end - __proc_info_begin), "missing CPU support")
ASSERT((__arch_info_end - __arch_info_begin), "no machine record defined")

/*
 * The HYP init code can't be more than a page long,
 * and should not cross a page boundary.
 * The above comment applies as well.
 */
ASSERT(__hyp_idmap_text_end - (__hyp_idmap_text_start & PAGE_MASK) <= PAGE_SIZE,
	"HYP init code too big or misaligned")

#ifdef CONFIG_XIP_DEFLATED_DATA
/*
 * The .bss is used as a stack area for __inflate_kernel_data() whose stack
 * frame is 9568 bytes. Make sure it has extra room left.
 */
ASSERT((_end - __bss_start) >= 12288, ".bss too small for CONFIG_XIP_DEFLATED_DATA")
#endif