xref: /openbmc/linux/arch/arm64/kernel/vmlinux.lds.S (revision c7b9adaf) 
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * ld script to make ARM Linux kernel
4 * taken from the i386 version by Russell King
5 * Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>
6 */
7
8#include <asm-generic/vmlinux.lds.h>
9#include <asm/cache.h>
10#include <asm/kernel-pgtable.h>
11#include <asm/thread_info.h>
12#include <asm/memory.h>
13#include <asm/page.h>
14#include <asm/pgtable.h>
15
16#include "image.h"
17
18/* .exit.text needed in case of alternative patching */
19#define ARM_EXIT_KEEP(x)	x
20#define ARM_EXIT_DISCARD(x)
21
22OUTPUT_ARCH(aarch64)
23ENTRY(_text)
24
25jiffies = jiffies_64;
26
27#define HYPERVISOR_TEXT					\
28	/*						\
29	 * Align to 4 KB so that			\
30	 * a) the HYP vector table is at its minimum	\
31	 *    alignment of 2048 bytes			\
32	 * b) the HYP init code will not cross a page	\
33	 *    boundary if its size does not exceed	\
34	 *    4 KB (see related ASSERT() below)		\
35	 */						\
36	. = ALIGN(SZ_4K);				\
37	VMLINUX_SYMBOL(__hyp_idmap_text_start) = .;	\
38	*(.hyp.idmap.text)				\
39	VMLINUX_SYMBOL(__hyp_idmap_text_end) = .;	\
40	VMLINUX_SYMBOL(__hyp_text_start) = .;		\
41	*(.hyp.text)					\
42	VMLINUX_SYMBOL(__hyp_text_end) = .;
43
44#define IDMAP_TEXT					\
45	. = ALIGN(SZ_4K);				\
46	VMLINUX_SYMBOL(__idmap_text_start) = .;		\
47	*(.idmap.text)					\
48	VMLINUX_SYMBOL(__idmap_text_end) = .;
49
50#ifdef CONFIG_HIBERNATION
51#define HIBERNATE_TEXT					\
52	. = ALIGN(SZ_4K);				\
53	VMLINUX_SYMBOL(__hibernate_exit_text_start) = .;\
54	*(.hibernate_exit.text)				\
55	VMLINUX_SYMBOL(__hibernate_exit_text_end) = .;
56#else
57#define HIBERNATE_TEXT
58#endif
59
60#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
61#define TRAMP_TEXT					\
62	. = ALIGN(PAGE_SIZE);				\
63	VMLINUX_SYMBOL(__entry_tramp_text_start) = .;	\
64	*(.entry.tramp.text)				\
65	. = ALIGN(PAGE_SIZE);				\
66	VMLINUX_SYMBOL(__entry_tramp_text_end) = .;
67#else
68#define TRAMP_TEXT
69#endif
70
71/*
72 * The size of the PE/COFF section that covers the kernel image, which
73 * runs from stext to _edata, must be a round multiple of the PE/COFF
74 * FileAlignment, which we set to its minimum value of 0x200. 'stext'
75 * itself is 4 KB aligned, so padding out _edata to a 0x200 aligned
76 * boundary should be sufficient.
77 */
78PECOFF_FILE_ALIGNMENT = 0x200;
79
80#ifdef CONFIG_EFI
81#define PECOFF_EDATA_PADDING	\
82	.pecoff_edata_padding : { BYTE(0); . = ALIGN(PECOFF_FILE_ALIGNMENT); }
83#else
84#define PECOFF_EDATA_PADDING
85#endif
86
87SECTIONS
88{
89	/*
90	 * XXX: The linker does not define how output sections are
91	 * assigned to input sections when there are multiple statements
92	 * matching the same input section name.  There is no documented
93	 * order of matching.
94	 */
95	/DISCARD/ : {
96		ARM_EXIT_DISCARD(EXIT_TEXT)
97		ARM_EXIT_DISCARD(EXIT_DATA)
98		EXIT_CALL
99		*(.discard)
100		*(.discard.*)
101		*(.interp .dynamic)
102		*(.dynsym .dynstr .hash)
103	}
104
105	. = KIMAGE_VADDR + TEXT_OFFSET;
106
107	.head.text : {
108		_text = .;
109		HEAD_TEXT
110	}
111	.text : {			/* Real text segment		*/
112		_stext = .;		/* Text and read-only data	*/
113			__exception_text_start = .;
114			*(.exception.text)
115			__exception_text_end = .;
116			IRQENTRY_TEXT
117			SOFTIRQENTRY_TEXT
118			ENTRY_TEXT
119			TEXT_TEXT
120			SCHED_TEXT
121			CPUIDLE_TEXT
122			LOCK_TEXT
123			KPROBES_TEXT
124			HYPERVISOR_TEXT
125			IDMAP_TEXT
126			HIBERNATE_TEXT
127			TRAMP_TEXT
128			*(.fixup)
129			*(.gnu.warning)
130		. = ALIGN(16);
131		*(.got)			/* Global offset table		*/
132	}
133
134	. = ALIGN(SEGMENT_ALIGN);
135	_etext = .;			/* End of text section */
136
137	RO_DATA(PAGE_SIZE)		/* everything from this point to     */
138	EXCEPTION_TABLE(8)		/* __init_begin will be marked RO NX */
139	NOTES
140
141	. = ALIGN(SEGMENT_ALIGN);
142	__init_begin = .;
143	__inittext_begin = .;
144
145	INIT_TEXT_SECTION(8)
146	.exit.text : {
147		ARM_EXIT_KEEP(EXIT_TEXT)
148	}
149
150	. = ALIGN(4);
151	.altinstructions : {
152		__alt_instructions = .;
153		*(.altinstructions)
154		__alt_instructions_end = .;
155	}
156	.altinstr_replacement : {
157		*(.altinstr_replacement)
158	}
159
160	. = ALIGN(PAGE_SIZE);
161	__inittext_end = .;
162	__initdata_begin = .;
163
164	.init.data : {
165		INIT_DATA
166		INIT_SETUP(16)
167		INIT_CALLS
168		CON_INITCALL
169		SECURITY_INITCALL
170		INIT_RAM_FS
171		*(.init.rodata.* .init.bss)	/* from the EFI stub */
172	}
173	.exit.data : {
174		ARM_EXIT_KEEP(EXIT_DATA)
175	}
176
177	PERCPU_SECTION(L1_CACHE_BYTES)
178
179	.rela : ALIGN(8) {
180		*(.rela .rela*)
181	}
182
183	__rela_offset	= ABSOLUTE(ADDR(.rela) - KIMAGE_VADDR);
184	__rela_size	= SIZEOF(.rela);
185
186	. = ALIGN(SEGMENT_ALIGN);
187	__initdata_end = .;
188	__init_end = .;
189
190	_data = .;
191	_sdata = .;
192	RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, THREAD_ALIGN)
193
194	/*
195	 * Data written with the MMU off but read with the MMU on requires
196	 * cache lines to be invalidated, discarding up to a Cache Writeback
197	 * Granule (CWG) of data from the cache. Keep the section that
198	 * requires this type of maintenance to be in its own Cache Writeback
199	 * Granule (CWG) area so the cache maintenance operations don't
200	 * interfere with adjacent data.
201	 */
202	.mmuoff.data.write : ALIGN(SZ_2K) {
203		__mmuoff_data_start = .;
204		*(.mmuoff.data.write)
205	}
206	. = ALIGN(SZ_2K);
207	.mmuoff.data.read : {
208		*(.mmuoff.data.read)
209		__mmuoff_data_end = .;
210	}
211
212	PECOFF_EDATA_PADDING
213	__pecoff_data_rawsize = ABSOLUTE(. - __initdata_begin);
214	_edata = .;
215
216	BSS_SECTION(0, 0, 0)
217
218	. = ALIGN(PAGE_SIZE);
219	idmap_pg_dir = .;
220	. += IDMAP_DIR_SIZE;
221	swapper_pg_dir = .;
222	. += SWAPPER_DIR_SIZE;
223
224#ifdef CONFIG_ARM64_SW_TTBR0_PAN
225	reserved_ttbr0 = .;
226	. += RESERVED_TTBR0_SIZE;
227#endif
228
229#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
230	tramp_pg_dir = .;
231	. += PAGE_SIZE;
232#endif
233
234	__pecoff_data_size = ABSOLUTE(. - __initdata_begin);
235	_end = .;
236
237	STABS_DEBUG
238
239	HEAD_SYMBOLS
240}
241
242/*
243 * The HYP init code and ID map text can't be longer than a page each,
244 * and should not cross a page boundary.
245 */
246ASSERT(__hyp_idmap_text_end - (__hyp_idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K,
247	"HYP init code too big or misaligned")
248ASSERT(__idmap_text_end - (__idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K,
249	"ID map text too big or misaligned")
250#ifdef CONFIG_HIBERNATION
251ASSERT(__hibernate_exit_text_end - (__hibernate_exit_text_start & ~(SZ_4K - 1))
252	<= SZ_4K, "Hibernate exit text too big or misaligned")
253#endif
254
255/*
256 * If padding is applied before .head.text, virt<->phys conversions will fail.
257 */
258ASSERT(_text == (KIMAGE_VADDR + TEXT_OFFSET), "HEAD is misaligned")
259