xref: /openbmc/linux/arch/arm/kernel/vmlinux-xip.lds.S (revision b24413180f5600bcb3bb70fbed5cf186b60864bd) 
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 <asm-generic/vmlinux.lds.h>
11#include <asm/cache.h>
12#include <asm/thread_info.h>
13#include <asm/memory.h>
14#include <asm/page.h>
15
16#define PROC_INFO							\
17	. = ALIGN(4);							\
18	VMLINUX_SYMBOL(__proc_info_begin) = .;				\
19	*(.proc.info.init)						\
20	VMLINUX_SYMBOL(__proc_info_end) = .;
21
22#define IDMAP_TEXT							\
23	ALIGN_FUNCTION();						\
24	VMLINUX_SYMBOL(__idmap_text_start) = .;				\
25	*(.idmap.text)							\
26	VMLINUX_SYMBOL(__idmap_text_end) = .;				\
27	. = ALIGN(PAGE_SIZE);						\
28	VMLINUX_SYMBOL(__hyp_idmap_text_start) = .;			\
29	*(.hyp.idmap.text)						\
30	VMLINUX_SYMBOL(__hyp_idmap_text_end) = .;
31
32#ifdef CONFIG_HOTPLUG_CPU
33#define ARM_CPU_DISCARD(x)
34#define ARM_CPU_KEEP(x)		x
35#else
36#define ARM_CPU_DISCARD(x)	x
37#define ARM_CPU_KEEP(x)
38#endif
39
40#if (defined(CONFIG_SMP_ON_UP) && !defined(CONFIG_DEBUG_SPINLOCK)) || \
41	defined(CONFIG_GENERIC_BUG)
42#define ARM_EXIT_KEEP(x)	x
43#define ARM_EXIT_DISCARD(x)
44#else
45#define ARM_EXIT_KEEP(x)
46#define ARM_EXIT_DISCARD(x)	x
47#endif
48
49OUTPUT_ARCH(arm)
50ENTRY(stext)
51
52#ifndef __ARMEB__
53jiffies = jiffies_64;
54#else
55jiffies = jiffies_64 + 4;
56#endif
57
58SECTIONS
59{
60	/*
61	 * XXX: The linker does not define how output sections are
62	 * assigned to input sections when there are multiple statements
63	 * matching the same input section name.  There is no documented
64	 * order of matching.
65	 *
66	 * unwind exit sections must be discarded before the rest of the
67	 * unwind sections get included.
68	 */
69	/DISCARD/ : {
70		*(.ARM.exidx.exit.text)
71		*(.ARM.extab.exit.text)
72		ARM_CPU_DISCARD(*(.ARM.exidx.cpuexit.text))
73		ARM_CPU_DISCARD(*(.ARM.extab.cpuexit.text))
74		ARM_EXIT_DISCARD(EXIT_TEXT)
75		ARM_EXIT_DISCARD(EXIT_DATA)
76		EXIT_CALL
77#ifndef CONFIG_MMU
78		*(.text.fixup)
79		*(__ex_table)
80#endif
81#ifndef CONFIG_SMP_ON_UP
82		*(.alt.smp.init)
83#endif
84		*(.discard)
85		*(.discard.*)
86	}
87
88	. = XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR);
89	_xiprom = .;			/* XIP ROM area to be mapped */
90
91	.head.text : {
92		_text = .;
93		HEAD_TEXT
94	}
95
96	.text : {			/* Real text segment		*/
97		_stext = .;		/* Text and read-only data	*/
98			IDMAP_TEXT
99			__exception_text_start = .;
100			*(.exception.text)
101			__exception_text_end = .;
102			IRQENTRY_TEXT
103			TEXT_TEXT
104			SCHED_TEXT
105			CPUIDLE_TEXT
106			LOCK_TEXT
107			KPROBES_TEXT
108			*(.gnu.warning)
109			*(.glue_7)
110			*(.glue_7t)
111		. = ALIGN(4);
112		*(.got)			/* Global offset table		*/
113			ARM_CPU_KEEP(PROC_INFO)
114	}
115
116	RO_DATA(PAGE_SIZE)
117
118	. = ALIGN(4);
119	__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
120		__start___ex_table = .;
121#ifdef CONFIG_MMU
122		*(__ex_table)
123#endif
124		__stop___ex_table = .;
125	}
126
127#ifdef CONFIG_ARM_UNWIND
128	/*
129	 * Stack unwinding tables
130	 */
131	. = ALIGN(8);
132	.ARM.unwind_idx : {
133		__start_unwind_idx = .;
134		*(.ARM.exidx*)
135		__stop_unwind_idx = .;
136	}
137	.ARM.unwind_tab : {
138		__start_unwind_tab = .;
139		*(.ARM.extab*)
140		__stop_unwind_tab = .;
141	}
142#endif
143
144	NOTES
145
146	_etext = .;			/* End of text and rodata section */
147
148	/*
149	 * The vectors and stubs are relocatable code, and the
150	 * only thing that matters is their relative offsets
151	 */
152	__vectors_start = .;
153	.vectors 0xffff0000 : AT(__vectors_start) {
154		*(.vectors)
155	}
156	. = __vectors_start + SIZEOF(.vectors);
157	__vectors_end = .;
158
159	__stubs_start = .;
160	.stubs ADDR(.vectors) + 0x1000 : AT(__stubs_start) {
161		*(.stubs)
162	}
163	. = __stubs_start + SIZEOF(.stubs);
164	__stubs_end = .;
165
166	PROVIDE(vector_fiq_offset = vector_fiq - ADDR(.vectors));
167
168	INIT_TEXT_SECTION(8)
169	.exit.text : {
170		ARM_EXIT_KEEP(EXIT_TEXT)
171	}
172	.init.proc.info : {
173		ARM_CPU_DISCARD(PROC_INFO)
174	}
175	.init.arch.info : {
176		__arch_info_begin = .;
177		*(.arch.info.init)
178		__arch_info_end = .;
179	}
180	.init.tagtable : {
181		__tagtable_begin = .;
182		*(.taglist.init)
183		__tagtable_end = .;
184	}
185#ifdef CONFIG_SMP_ON_UP
186	.init.smpalt : {
187		__smpalt_begin = .;
188		*(.alt.smp.init)
189		__smpalt_end = .;
190	}
191#endif
192	.init.pv_table : {
193		__pv_table_begin = .;
194		*(.pv_table)
195		__pv_table_end = .;
196	}
197	.init.data : {
198		INIT_SETUP(16)
199		INIT_CALLS
200		CON_INITCALL
201		SECURITY_INITCALL
202		INIT_RAM_FS
203	}
204
205#ifdef CONFIG_SMP
206	PERCPU_SECTION(L1_CACHE_BYTES)
207#endif
208
209	_exiprom = .;			/* End of XIP ROM area */
210	__data_loc = ALIGN(4);		/* location in binary */
211	. = PAGE_OFFSET + TEXT_OFFSET;
212
213	.data : AT(__data_loc) {
214		_data = .;		/* address in memory */
215		_sdata = .;
216
217		/*
218		 * first, the init task union, aligned
219		 * to an 8192 byte boundary.
220		 */
221		INIT_TASK_DATA(THREAD_SIZE)
222
223		. = ALIGN(PAGE_SIZE);
224		__init_begin = .;
225		INIT_DATA
226		ARM_EXIT_KEEP(EXIT_DATA)
227		. = ALIGN(PAGE_SIZE);
228		__init_end = .;
229
230		*(.data..ro_after_init)
231
232		NOSAVE_DATA
233		CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES)
234		READ_MOSTLY_DATA(L1_CACHE_BYTES)
235
236		/*
237		 * and the usual data section
238		 */
239		DATA_DATA
240		CONSTRUCTORS
241
242		_edata = .;
243	}
244	_edata_loc = __data_loc + SIZEOF(.data);
245
246	BUG_TABLE
247
248#ifdef CONFIG_HAVE_TCM
249        /*
250	 * We align everything to a page boundary so we can
251	 * free it after init has commenced and TCM contents have
252	 * been copied to its destination.
253	 */
254	.tcm_start : {
255		. = ALIGN(PAGE_SIZE);
256		__tcm_start = .;
257		__itcm_start = .;
258	}
259
260	/*
261	 * Link these to the ITCM RAM
262	 * Put VMA to the TCM address and LMA to the common RAM
263	 * and we'll upload the contents from RAM to TCM and free
264	 * the used RAM after that.
265	 */
266	.text_itcm ITCM_OFFSET : AT(__itcm_start)
267	{
268		__sitcm_text = .;
269		*(.tcm.text)
270		*(.tcm.rodata)
271		. = ALIGN(4);
272		__eitcm_text = .;
273	}
274
275	/*
276	 * Reset the dot pointer, this is needed to create the
277	 * relative __dtcm_start below (to be used as extern in code).
278	 */
279	. = ADDR(.tcm_start) + SIZEOF(.tcm_start) + SIZEOF(.text_itcm);
280
281	.dtcm_start : {
282		__dtcm_start = .;
283	}
284
285	/* TODO: add remainder of ITCM as well, that can be used for data! */
286	.data_dtcm DTCM_OFFSET : AT(__dtcm_start)
287	{
288		. = ALIGN(4);
289		__sdtcm_data = .;
290		*(.tcm.data)
291		. = ALIGN(4);
292		__edtcm_data = .;
293	}
294
295	/* Reset the dot pointer or the linker gets confused */
296	. = ADDR(.dtcm_start) + SIZEOF(.data_dtcm);
297
298	/* End marker for freeing TCM copy in linked object */
299	.tcm_end : AT(ADDR(.dtcm_start) + SIZEOF(.data_dtcm)){
300		. = ALIGN(PAGE_SIZE);
301		__tcm_end = .;
302	}
303#endif
304
305	BSS_SECTION(0, 0, 0)
306	_end = .;
307
308	STABS_DEBUG
309}
310
311/*
312 * These must never be empty
313 * If you have to comment these two assert statements out, your
314 * binutils is too old (for other reasons as well)
315 */
316ASSERT((__proc_info_end - __proc_info_begin), "missing CPU support")
317ASSERT((__arch_info_end - __arch_info_begin), "no machine record defined")
318
319/*
320 * The HYP init code can't be more than a page long,
321 * and should not cross a page boundary.
322 * The above comment applies as well.
323 */
324ASSERT(__hyp_idmap_text_end - (__hyp_idmap_text_start & PAGE_MASK) <= PAGE_SIZE,
325	"HYP init code too big or misaligned")
326