xref: /linux/arch/arm/kernel/vmlinux.lds.S (revision a58130ddc896e5a15e4de2bf50a1d89247118c23) 
1/* ld script to make ARM Linux kernel
2 * taken from the i386 version by Russell King
3 * Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>
4 */
5
6#include <asm-generic/vmlinux.lds.h>
7#include <asm/cache.h>
8#include <asm/thread_info.h>
9#include <asm/memory.h>
10#include <asm/page.h>
11
12#define PROC_INFO							\
13	. = ALIGN(4);							\
14	VMLINUX_SYMBOL(__proc_info_begin) = .;				\
15	*(.proc.info.init)						\
16	VMLINUX_SYMBOL(__proc_info_end) = .;
17
18#define IDMAP_TEXT							\
19	ALIGN_FUNCTION();						\
20	VMLINUX_SYMBOL(__idmap_text_start) = .;				\
21	*(.idmap.text)							\
22	VMLINUX_SYMBOL(__idmap_text_end) = .;
23
24#ifdef CONFIG_HOTPLUG_CPU
25#define ARM_CPU_DISCARD(x)
26#define ARM_CPU_KEEP(x)		x
27#else
28#define ARM_CPU_DISCARD(x)	x
29#define ARM_CPU_KEEP(x)
30#endif
31
32#if (defined(CONFIG_SMP_ON_UP) && !defined(CONFIG_DEBUG_SPINLOCK)) || \
33	defined(CONFIG_GENERIC_BUG)
34#define ARM_EXIT_KEEP(x)	x
35#define ARM_EXIT_DISCARD(x)
36#else
37#define ARM_EXIT_KEEP(x)
38#define ARM_EXIT_DISCARD(x)	x
39#endif
40
41OUTPUT_ARCH(arm)
42ENTRY(stext)
43
44#ifndef __ARMEB__
45jiffies = jiffies_64;
46#else
47jiffies = jiffies_64 + 4;
48#endif
49
50SECTIONS
51{
52	/*
53	 * XXX: The linker does not define how output sections are
54	 * assigned to input sections when there are multiple statements
55	 * matching the same input section name.  There is no documented
56	 * order of matching.
57	 *
58	 * unwind exit sections must be discarded before the rest of the
59	 * unwind sections get included.
60	 */
61	/DISCARD/ : {
62		*(.ARM.exidx.exit.text)
63		*(.ARM.extab.exit.text)
64		ARM_CPU_DISCARD(*(.ARM.exidx.cpuexit.text))
65		ARM_CPU_DISCARD(*(.ARM.extab.cpuexit.text))
66		ARM_EXIT_DISCARD(EXIT_TEXT)
67		ARM_EXIT_DISCARD(EXIT_DATA)
68		EXIT_CALL
69#ifndef CONFIG_HOTPLUG
70		*(.ARM.exidx.devexit.text)
71		*(.ARM.extab.devexit.text)
72#endif
73#ifndef CONFIG_MMU
74		*(.fixup)
75		*(__ex_table)
76#endif
77#ifndef CONFIG_SMP_ON_UP
78		*(.alt.smp.init)
79#endif
80		*(.discard)
81		*(.discard.*)
82	}
83
84#ifdef CONFIG_XIP_KERNEL
85	. = XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR);
86#else
87	. = PAGE_OFFSET + TEXT_OFFSET;
88#endif
89	.head.text : {
90		_text = .;
91		HEAD_TEXT
92	}
93	.text : {			/* Real text segment		*/
94		_stext = .;		/* Text and read-only data	*/
95			__exception_text_start = .;
96			*(.exception.text)
97			__exception_text_end = .;
98			IRQENTRY_TEXT
99			TEXT_TEXT
100			SCHED_TEXT
101			LOCK_TEXT
102			KPROBES_TEXT
103			IDMAP_TEXT
104#ifdef CONFIG_MMU
105			*(.fixup)
106#endif
107			*(.gnu.warning)
108			*(.glue_7)
109			*(.glue_7t)
110		. = ALIGN(4);
111		*(.got)			/* Global offset table		*/
112			ARM_CPU_KEEP(PROC_INFO)
113	}
114
115	RO_DATA(PAGE_SIZE)
116
117	. = ALIGN(4);
118	__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
119		__start___ex_table = .;
120#ifdef CONFIG_MMU
121		*(__ex_table)
122#endif
123		__stop___ex_table = .;
124	}
125
126#ifdef CONFIG_ARM_UNWIND
127	/*
128	 * Stack unwinding tables
129	 */
130	. = ALIGN(8);
131	.ARM.unwind_idx : {
132		__start_unwind_idx = .;
133		*(.ARM.exidx*)
134		__stop_unwind_idx = .;
135	}
136	.ARM.unwind_tab : {
137		__start_unwind_tab = .;
138		*(.ARM.extab*)
139		__stop_unwind_tab = .;
140	}
141#endif
142
143	_etext = .;			/* End of text and rodata section */
144
145#ifndef CONFIG_XIP_KERNEL
146	. = ALIGN(PAGE_SIZE);
147	__init_begin = .;
148#endif
149
150	INIT_TEXT_SECTION(8)
151	.exit.text : {
152		ARM_EXIT_KEEP(EXIT_TEXT)
153	}
154	.init.proc.info : {
155		ARM_CPU_DISCARD(PROC_INFO)
156	}
157	.init.arch.info : {
158		__arch_info_begin = .;
159		*(.arch.info.init)
160		__arch_info_end = .;
161	}
162	.init.tagtable : {
163		__tagtable_begin = .;
164		*(.taglist.init)
165		__tagtable_end = .;
166	}
167#ifdef CONFIG_SMP_ON_UP
168	.init.smpalt : {
169		__smpalt_begin = .;
170		*(.alt.smp.init)
171		__smpalt_end = .;
172	}
173#endif
174	.init.pv_table : {
175		__pv_table_begin = .;
176		*(.pv_table)
177		__pv_table_end = .;
178	}
179	.init.data : {
180#ifndef CONFIG_XIP_KERNEL
181		INIT_DATA
182#endif
183		INIT_SETUP(16)
184		INIT_CALLS
185		CON_INITCALL
186		SECURITY_INITCALL
187		INIT_RAM_FS
188	}
189#ifndef CONFIG_XIP_KERNEL
190	.exit.data : {
191		ARM_EXIT_KEEP(EXIT_DATA)
192	}
193#endif
194
195#ifdef CONFIG_SMP
196	PERCPU_SECTION(L1_CACHE_BYTES)
197#endif
198
199#ifdef CONFIG_XIP_KERNEL
200	__data_loc = ALIGN(4);		/* location in binary */
201	. = PAGE_OFFSET + TEXT_OFFSET;
202#else
203	__init_end = .;
204	. = ALIGN(THREAD_SIZE);
205	__data_loc = .;
206#endif
207
208	.data : AT(__data_loc) {
209		_data = .;		/* address in memory */
210		_sdata = .;
211
212		/*
213		 * first, the init task union, aligned
214		 * to an 8192 byte boundary.
215		 */
216		INIT_TASK_DATA(THREAD_SIZE)
217
218#ifdef CONFIG_XIP_KERNEL
219		. = ALIGN(PAGE_SIZE);
220		__init_begin = .;
221		INIT_DATA
222		ARM_EXIT_KEEP(EXIT_DATA)
223		. = ALIGN(PAGE_SIZE);
224		__init_end = .;
225#endif
226
227		NOSAVE_DATA
228		CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES)
229		READ_MOSTLY_DATA(L1_CACHE_BYTES)
230
231		/*
232		 * and the usual data section
233		 */
234		DATA_DATA
235		CONSTRUCTORS
236
237		_edata = .;
238	}
239	_edata_loc = __data_loc + SIZEOF(.data);
240
241#ifdef CONFIG_HAVE_TCM
242        /*
243	 * We align everything to a page boundary so we can
244	 * free it after init has commenced and TCM contents have
245	 * been copied to its destination.
246	 */
247	.tcm_start : {
248		. = ALIGN(PAGE_SIZE);
249		__tcm_start = .;
250		__itcm_start = .;
251	}
252
253	/*
254	 * Link these to the ITCM RAM
255	 * Put VMA to the TCM address and LMA to the common RAM
256	 * and we'll upload the contents from RAM to TCM and free
257	 * the used RAM after that.
258	 */
259	.text_itcm ITCM_OFFSET : AT(__itcm_start)
260	{
261		__sitcm_text = .;
262		*(.tcm.text)
263		*(.tcm.rodata)
264		. = ALIGN(4);
265		__eitcm_text = .;
266	}
267
268	/*
269	 * Reset the dot pointer, this is needed to create the
270	 * relative __dtcm_start below (to be used as extern in code).
271	 */
272	. = ADDR(.tcm_start) + SIZEOF(.tcm_start) + SIZEOF(.text_itcm);
273
274	.dtcm_start : {
275		__dtcm_start = .;
276	}
277
278	/* TODO: add remainder of ITCM as well, that can be used for data! */
279	.data_dtcm DTCM_OFFSET : AT(__dtcm_start)
280	{
281		. = ALIGN(4);
282		__sdtcm_data = .;
283		*(.tcm.data)
284		. = ALIGN(4);
285		__edtcm_data = .;
286	}
287
288	/* Reset the dot pointer or the linker gets confused */
289	. = ADDR(.dtcm_start) + SIZEOF(.data_dtcm);
290
291	/* End marker for freeing TCM copy in linked object */
292	.tcm_end : AT(ADDR(.dtcm_start) + SIZEOF(.data_dtcm)){
293		. = ALIGN(PAGE_SIZE);
294		__tcm_end = .;
295	}
296#endif
297
298	NOTES
299
300	BSS_SECTION(0, 0, 0)
301	_end = .;
302
303	STABS_DEBUG
304	.comment 0 : { *(.comment) }
305}
306
307/*
308 * These must never be empty
309 * If you have to comment these two assert statements out, your
310 * binutils is too old (for other reasons as well)
311 */
312ASSERT((__proc_info_end - __proc_info_begin), "missing CPU support")
313ASSERT((__arch_info_end - __arch_info_begin), "no machine record defined")
314