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