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