1/* SPDX-License-Identifier: GPL-2.0 */
2/* ld script to make ARM Linux kernel
3 * taken from the i386 version by Russell King
4 * Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>
5 */
6
7/* No __ro_after_init data in the .rodata section - which will always be ro */
8#define RO_AFTER_INIT_DATA
9
10#include <linux/sizes.h>
11
12#include <asm-generic/vmlinux.lds.h>
13#include <asm/cache.h>
14#include <asm/thread_info.h>
15#include <asm/memory.h>
16#include <asm/page.h>
17
18#include "vmlinux.lds.h"
19
20OUTPUT_ARCH(arm)
21ENTRY(stext)
22
23#ifndef __ARMEB__
24jiffies = jiffies_64;
25#else
26jiffies = jiffies_64 + 4;
27#endif
28
29SECTIONS
30{
31	/*
32	 * XXX: The linker does not define how output sections are
33	 * assigned to input sections when there are multiple statements
34	 * matching the same input section name.  There is no documented
35	 * order of matching.
36	 *
37	 * unwind exit sections must be discarded before the rest of the
38	 * unwind sections get included.
39	 */
40	/DISCARD/ : {
41		*(.ARM.exidx.exit.text)
42		*(.ARM.extab.exit.text)
43		ARM_CPU_DISCARD(*(.ARM.exidx.cpuexit.text))
44		ARM_CPU_DISCARD(*(.ARM.extab.cpuexit.text))
45		ARM_EXIT_DISCARD(EXIT_TEXT)
46		ARM_EXIT_DISCARD(EXIT_DATA)
47		EXIT_CALL
48#ifndef CONFIG_MMU
49		*(.text.fixup)
50		*(__ex_table)
51#endif
52		*(.alt.smp.init)
53		*(.discard)
54		*(.discard.*)
55	}
56
57	. = XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR);
58	_xiprom = .;			/* XIP ROM area to be mapped */
59
60	.head.text : {
61		_text = .;
62		HEAD_TEXT
63	}
64
65	.text : {			/* Real text segment		*/
66		_stext = .;		/* Text and read-only data	*/
67			IDMAP_TEXT
68			__entry_text_start = .;
69			*(.entry.text)
70			__entry_text_end = .;
71			IRQENTRY_TEXT
72			SOFTIRQENTRY_TEXT
73			TEXT_TEXT
74			SCHED_TEXT
75			CPUIDLE_TEXT
76			LOCK_TEXT
77			HYPERVISOR_TEXT
78			KPROBES_TEXT
79			*(.gnu.warning)
80			*(.glue_7)
81			*(.glue_7t)
82		. = ALIGN(4);
83		*(.got)			/* Global offset table		*/
84			ARM_CPU_KEEP(PROC_INFO)
85	}
86
87	RO_DATA(PAGE_SIZE)
88
89	. = ALIGN(4);
90	__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
91		__start___ex_table = .;
92#ifdef CONFIG_MMU
93		*(__ex_table)
94#endif
95		__stop___ex_table = .;
96	}
97
98#ifdef CONFIG_ARM_UNWIND
99	/*
100	 * Stack unwinding tables
101	 */
102	. = ALIGN(8);
103	.ARM.unwind_idx : {
104		__start_unwind_idx = .;
105		*(.ARM.exidx*)
106		__stop_unwind_idx = .;
107	}
108	.ARM.unwind_tab : {
109		__start_unwind_tab = .;
110		*(.ARM.extab*)
111		__stop_unwind_tab = .;
112	}
113#endif
114
115	NOTES
116
117	_etext = .;			/* End of text and rodata section */
118
119	/*
120	 * The vectors and stubs are relocatable code, and the
121	 * only thing that matters is their relative offsets
122	 */
123	__vectors_start = .;
124	.vectors 0xffff0000 : AT(__vectors_start) {
125		*(.vectors)
126	}
127	. = __vectors_start + SIZEOF(.vectors);
128	__vectors_end = .;
129
130	__stubs_start = .;
131	.stubs ADDR(.vectors) + 0x1000 : AT(__stubs_start) {
132		*(.stubs)
133	}
134	. = __stubs_start + SIZEOF(.stubs);
135	__stubs_end = .;
136
137	PROVIDE(vector_fiq_offset = vector_fiq - ADDR(.vectors));
138
139	INIT_TEXT_SECTION(8)
140	.exit.text : {
141		ARM_EXIT_KEEP(EXIT_TEXT)
142	}
143	.init.proc.info : {
144		ARM_CPU_DISCARD(PROC_INFO)
145	}
146	.init.arch.info : {
147		__arch_info_begin = .;
148		*(.arch.info.init)
149		__arch_info_end = .;
150	}
151	.init.tagtable : {
152		__tagtable_begin = .;
153		*(.taglist.init)
154		__tagtable_end = .;
155	}
156	.init.rodata : {
157		INIT_SETUP(16)
158		INIT_CALLS
159		CON_INITCALL
160		SECURITY_INITCALL
161		INIT_RAM_FS
162	}
163
164#ifdef CONFIG_ARM_MPU
165	. = ALIGN(SZ_128K);
166#endif
167	_exiprom = .;			/* End of XIP ROM area */
168
169/*
170 * From this point, stuff is considered writable and will be copied to RAM
171 */
172	__data_loc = ALIGN(4);		/* location in file */
173	. = PAGE_OFFSET + TEXT_OFFSET;	/* location in memory */
174#undef LOAD_OFFSET
175#define LOAD_OFFSET (PAGE_OFFSET + TEXT_OFFSET - __data_loc)
176
177	. = ALIGN(THREAD_SIZE);
178	_sdata = .;
179	RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE)
180	.data.ro_after_init : AT(ADDR(.data.ro_after_init) - LOAD_OFFSET) {
181		*(.data..ro_after_init)
182	}
183	_edata = .;
184
185	. = ALIGN(PAGE_SIZE);
186	__init_begin = .;
187	.init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {
188		INIT_DATA
189	}
190	.exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) {
191		ARM_EXIT_KEEP(EXIT_DATA)
192	}
193#ifdef CONFIG_SMP
194	PERCPU_SECTION(L1_CACHE_BYTES)
195#endif
196
197	/*
198	 * End of copied data. We need a dummy section to get its LMA.
199	 * Also located before final ALIGN() as trailing padding is not stored
200	 * in the resulting binary file and useless to copy.
201	 */
202	.data.endmark : AT(ADDR(.data.endmark) - LOAD_OFFSET) { }
203	_edata_loc = LOADADDR(.data.endmark);
204
205	. = ALIGN(PAGE_SIZE);
206	__init_end = .;
207
208#ifdef CONFIG_HAVE_TCM
209        /*
210	 * We align everything to a page boundary so we can
211	 * free it after init has commenced and TCM contents have
212	 * been copied to its destination.
213	 */
214	.tcm_start : {
215		. = ALIGN(PAGE_SIZE);
216		__tcm_start = .;
217		__itcm_start = .;
218	}
219
220	/*
221	 * Link these to the ITCM RAM
222	 * Put VMA to the TCM address and LMA to the common RAM
223	 * and we'll upload the contents from RAM to TCM and free
224	 * the used RAM after that.
225	 */
226	.text_itcm ITCM_OFFSET : AT(__itcm_start)
227	{
228		__sitcm_text = .;
229		*(.tcm.text)
230		*(.tcm.rodata)
231		. = ALIGN(4);
232		__eitcm_text = .;
233	}
234
235	/*
236	 * Reset the dot pointer, this is needed to create the
237	 * relative __dtcm_start below (to be used as extern in code).
238	 */
239	. = ADDR(.tcm_start) + SIZEOF(.tcm_start) + SIZEOF(.text_itcm);
240
241	.dtcm_start : {
242		__dtcm_start = .;
243	}
244
245	/* TODO: add remainder of ITCM as well, that can be used for data! */
246	.data_dtcm DTCM_OFFSET : AT(__dtcm_start)
247	{
248		. = ALIGN(4);
249		__sdtcm_data = .;
250		*(.tcm.data)
251		. = ALIGN(4);
252		__edtcm_data = .;
253	}
254
255	/* Reset the dot pointer or the linker gets confused */
256	. = ADDR(.dtcm_start) + SIZEOF(.data_dtcm);
257
258	/* End marker for freeing TCM copy in linked object */
259	.tcm_end : AT(ADDR(.dtcm_start) + SIZEOF(.data_dtcm)){
260		. = ALIGN(PAGE_SIZE);
261		__tcm_end = .;
262	}
263#endif
264
265	BSS_SECTION(0, 0, 8)
266	_end = .;
267
268	STABS_DEBUG
269}
270
271/*
272 * These must never be empty
273 * If you have to comment these two assert statements out, your
274 * binutils is too old (for other reasons as well)
275 */
276ASSERT((__proc_info_end - __proc_info_begin), "missing CPU support")
277ASSERT((__arch_info_end - __arch_info_begin), "no machine record defined")
278
279/*
280 * The HYP init code can't be more than a page long,
281 * and should not cross a page boundary.
282 * The above comment applies as well.
283 */
284ASSERT(__hyp_idmap_text_end - (__hyp_idmap_text_start & PAGE_MASK) <= PAGE_SIZE,
285	"HYP init code too big or misaligned")
286
287#ifdef CONFIG_XIP_DEFLATED_DATA
288/*
289 * The .bss is used as a stack area for __inflate_kernel_data() whose stack
290 * frame is 9568 bytes. Make sure it has extra room left.
291 */
292ASSERT((_end - __bss_start) >= 12288, ".bss too small for CONFIG_XIP_DEFLATED_DATA")
293#endif
294
295#ifdef CONFIG_ARM_MPU
296/*
297 * Due to PMSAv7 restriction on base address and size we have to
298 * enforce minimal alignment restrictions. It was seen that weaker
299 * alignment restriction on _xiprom will likely force XIP address
300 * space spawns multiple MPU regions thus it is likely we run in
301 * situation when we are reprogramming MPU region we run on with
302 * something which doesn't cover reprogramming code itself, so as soon
303 * as we update MPU settings we'd immediately try to execute straight
304 * from background region which is XN.
305 * It seem that alignment in 1M should suit most users.
306 * _exiprom is aligned as 1/8 of 1M so can be covered by subregion
307 * disable
308 */
309ASSERT(!(_xiprom & (SZ_1M - 1)), "XIP start address may cause MPU programming issues")
310ASSERT(!(_exiprom & (SZ_128K - 1)), "XIP end address may cause MPU programming issues")
311#endif
312