summaryrefslogtreecommitdiffstats
path: root/arch/arm64/kernel/vmlinux.lds.S
blob: 5a1939a74ff3588bb388c73741499d6061594a5d (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
/*
 * 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-generic/vmlinux.lds.h>
#include <asm/cache.h>
#include <asm/kernel-pgtable.h>
#include <asm/thread_info.h>
#include <asm/memory.h>
#include <asm/page.h>
#include <asm/pgtable.h>

#include "image.h"

/* .exit.text needed in case of alternative patching */
#define ARM_EXIT_KEEP(x)	x
#define ARM_EXIT_DISCARD(x)

OUTPUT_ARCH(aarch64)
ENTRY(_text)

jiffies = jiffies_64;

#define HYPERVISOR_TEXT					\
	/*						\
	 * Align to 4 KB so that			\
	 * a) the HYP vector table is at its minimum	\
	 *    alignment of 2048 bytes			\
	 * b) the HYP init code will not cross a page	\
	 *    boundary if its size does not exceed	\
	 *    4 KB (see related ASSERT() below)		\
	 */						\
	. = ALIGN(SZ_4K);				\
	VMLINUX_SYMBOL(__hyp_idmap_text_start) = .;	\
	*(.hyp.idmap.text)				\
	VMLINUX_SYMBOL(__hyp_idmap_text_end) = .;	\
	VMLINUX_SYMBOL(__hyp_text_start) = .;		\
	*(.hyp.text)					\
	VMLINUX_SYMBOL(__hyp_text_end) = .;

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

/*
 * 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

#if defined(CONFIG_DEBUG_ALIGN_RODATA)
#define ALIGN_DEBUG_RO			. = ALIGN(1<<SECTION_SHIFT);
#define ALIGN_DEBUG_RO_MIN(min)		ALIGN_DEBUG_RO
#elif defined(CONFIG_DEBUG_RODATA)
#define ALIGN_DEBUG_RO			. = ALIGN(1<<PAGE_SHIFT);
#define ALIGN_DEBUG_RO_MIN(min)		ALIGN_DEBUG_RO
#else
#define ALIGN_DEBUG_RO
#define ALIGN_DEBUG_RO_MIN(min)		. = ALIGN(min);
#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.
	 */
	/DISCARD/ : {
		ARM_EXIT_DISCARD(EXIT_TEXT)
		ARM_EXIT_DISCARD(EXIT_DATA)
		EXIT_CALL
		*(.discard)
		*(.discard.*)
		*(.interp .dynamic)
	}

	. = KIMAGE_VADDR + TEXT_OFFSET;

	.head.text : {
		_text = .;
		HEAD_TEXT
	}
	ALIGN_DEBUG_RO_MIN(PAGE_SIZE)
	.text : {			/* Real text segment		*/
		_stext = .;		/* Text and read-only data	*/
			__exception_text_start = .;
			*(.exception.text)
			__exception_text_end = .;
			IRQENTRY_TEXT
			SOFTIRQENTRY_TEXT
			TEXT_TEXT
			SCHED_TEXT
			LOCK_TEXT
			HYPERVISOR_TEXT
			IDMAP_TEXT
			*(.fixup)
			*(.gnu.warning)
		. = ALIGN(16);
		*(.got)			/* Global offset table		*/
	}

	ALIGN_DEBUG_RO_MIN(PAGE_SIZE)
	RO_DATA(PAGE_SIZE)		/* everything from this point to */
	EXCEPTION_TABLE(8)		/* _etext will be marked RO NX   */
	NOTES

	ALIGN_DEBUG_RO_MIN(PAGE_SIZE)
	_etext = .;			/* End of text and rodata section */
	__init_begin = .;

	INIT_TEXT_SECTION(8)
	.exit.text : {
		ARM_EXIT_KEEP(EXIT_TEXT)
	}

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

	PERCPU_SECTION(L1_CACHE_BYTES)

	. = ALIGN(4);
	.altinstructions : {
		__alt_instructions = .;
		*(.altinstructions)
		__alt_instructions_end = .;
	}
	.altinstr_replacement : {
		*(.altinstr_replacement)
	}
	.rela : ALIGN(8) {
		__reloc_start = .;
		*(.rela .rela*)
		__reloc_end = .;
	}
	.dynsym : ALIGN(8) {
		__dynsym_start = .;
		*(.dynsym)
	}
	.dynstr : {
		*(.dynstr)
	}
	.hash : {
		*(.hash)
	}

	. = ALIGN(PAGE_SIZE);
	__init_end = .;

	_data = .;
	_sdata = .;
	RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE)
	PECOFF_EDATA_PADDING
	_edata = .;

	BSS_SECTION(0, 0, 0)

	. = ALIGN(PAGE_SIZE);
	idmap_pg_dir = .;
	. += IDMAP_DIR_SIZE;
	swapper_pg_dir = .;
	. += SWAPPER_DIR_SIZE;

	_end = .;

	STABS_DEBUG

	HEAD_SYMBOLS
}

/*
 * The HYP init code and ID map text can't be longer than a page each,
 * and should not cross a page boundary.
 */
ASSERT(__hyp_idmap_text_end - (__hyp_idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K,
	"HYP init code too big or misaligned")
ASSERT(__idmap_text_end - (__idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K,
	"ID map text too big or misaligned")

/*
 * If padding is applied before .head.text, virt<->phys conversions will fail.
 */
ASSERT(_text == (KIMAGE_VADDR + TEXT_OFFSET), "HEAD is misaligned")
OpenPOWER on IntegriCloud