xref: /linux/arch/arm/kernel/vmlinux.lds.S (revision 079c9534a96da9a85a2a2f9715851050fbfbf749) 
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	VMLINUX_SYMBOL(__proc_info_begin) = .;				\
14	*(.proc.info.init)						\
15	VMLINUX_SYMBOL(__proc_info_end) = .;
16
17#define IDMAP_TEXT							\
18	ALIGN_FUNCTION();						\
19	VMLINUX_SYMBOL(__idmap_text_start) = .;				\
20	*(.idmap.text)							\
21	VMLINUX_SYMBOL(__idmap_text_end) = .;
22
23#ifdef CONFIG_HOTPLUG_CPU
24#define ARM_CPU_DISCARD(x)
25#define ARM_CPU_KEEP(x)		x
26#else
27#define ARM_CPU_DISCARD(x)	x
28#define ARM_CPU_KEEP(x)
29#endif
30
31#if (defined(CONFIG_SMP_ON_UP) && !defined(CONFIG_DEBUG_SPINLOCK)) || \
32	defined(CONFIG_GENERIC_BUG)
33#define ARM_EXIT_KEEP(x)	x
34#define ARM_EXIT_DISCARD(x)
35#else
36#define ARM_EXIT_KEEP(x)
37#define ARM_EXIT_DISCARD(x)	x
38#endif
39
40OUTPUT_ARCH(arm)
41ENTRY(stext)
42
43#ifndef __ARMEB__
44jiffies = jiffies_64;
45#else
46jiffies = jiffies_64 + 4;
47#endif
48
49SECTIONS
50{
51	/*
52	 * XXX: The linker does not define how output sections are
53	 * assigned to input sections when there are multiple statements
54	 * matching the same input section name.  There is no documented
55	 * order of matching.
56	 *
57	 * unwind exit sections must be discarded before the rest of the
58	 * unwind sections get included.
59	 */
60	/DISCARD/ : {
61		*(.ARM.exidx.exit.text)
62		*(.ARM.extab.exit.text)
63		ARM_CPU_DISCARD(*(.ARM.exidx.cpuexit.text))
64		ARM_CPU_DISCARD(*(.ARM.extab.cpuexit.text))
65		ARM_EXIT_DISCARD(EXIT_TEXT)
66		ARM_EXIT_DISCARD(EXIT_DATA)
67		EXIT_CALL
68#ifndef CONFIG_HOTPLUG
69		*(.ARM.exidx.devexit.text)
70		*(.ARM.extab.devexit.text)
71#endif
72#ifndef CONFIG_MMU
73		*(.fixup)
74		*(__ex_table)
75#endif
76#ifndef CONFIG_SMP_ON_UP
77		*(.alt.smp.init)
78#endif
79		*(.discard)
80		*(.discard.*)
81	}
82
83#ifdef CONFIG_XIP_KERNEL
84	. = XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR);
85#else
86	. = PAGE_OFFSET + TEXT_OFFSET;
87#endif
88	.head.text : {
89		_text = .;
90		HEAD_TEXT
91	}
92	.text : {			/* Real text segment		*/
93		_stext = .;		/* Text and read-only data	*/
94			__exception_text_start = .;
95			*(.exception.text)
96			__exception_text_end = .;
97			IRQENTRY_TEXT
98			TEXT_TEXT
99			SCHED_TEXT
100			LOCK_TEXT
101			KPROBES_TEXT
102			IDMAP_TEXT
103#ifdef CONFIG_MMU
104			*(.fixup)
105#endif
106			*(.gnu.warning)
107			*(.glue_7)
108			*(.glue_7t)
109		. = ALIGN(4);
110		*(.got)			/* Global offset table		*/
111			ARM_CPU_KEEP(PROC_INFO)
112	}
113
114	RO_DATA(PAGE_SIZE)
115
116#ifdef CONFIG_ARM_UNWIND
117	/*
118	 * Stack unwinding tables
119	 */
120	. = ALIGN(8);
121	.ARM.unwind_idx : {
122		__start_unwind_idx = .;
123		*(.ARM.exidx*)
124		__stop_unwind_idx = .;
125	}
126	.ARM.unwind_tab : {
127		__start_unwind_tab = .;
128		*(.ARM.extab*)
129		__stop_unwind_tab = .;
130	}
131#endif
132
133	_etext = .;			/* End of text and rodata section */
134
135#ifndef CONFIG_XIP_KERNEL
136	. = ALIGN(PAGE_SIZE);
137	__init_begin = .;
138#endif
139
140	INIT_TEXT_SECTION(8)
141	.exit.text : {
142		ARM_EXIT_KEEP(EXIT_TEXT)
143	}
144	.init.proc.info : {
145		ARM_CPU_DISCARD(PROC_INFO)
146	}
147	.init.arch.info : {
148		__arch_info_begin = .;
149		*(.arch.info.init)
150		__arch_info_end = .;
151	}
152	.init.tagtable : {
153		__tagtable_begin = .;
154		*(.taglist.init)
155		__tagtable_end = .;
156	}
157#ifdef CONFIG_SMP_ON_UP
158	.init.smpalt : {
159		__smpalt_begin = .;
160		*(.alt.smp.init)
161		__smpalt_end = .;
162	}
163#endif
164	.init.pv_table : {
165		__pv_table_begin = .;
166		*(.pv_table)
167		__pv_table_end = .;
168	}
169	.init.data : {
170#ifndef CONFIG_XIP_KERNEL
171		INIT_DATA
172#endif
173		INIT_SETUP(16)
174		INIT_CALLS
175		CON_INITCALL
176		SECURITY_INITCALL
177		INIT_RAM_FS
178	}
179#ifndef CONFIG_XIP_KERNEL
180	.exit.data : {
181		ARM_EXIT_KEEP(EXIT_DATA)
182	}
183#endif
184
185	PERCPU_SECTION(L1_CACHE_BYTES)
186
187#ifdef CONFIG_XIP_KERNEL
188	__data_loc = ALIGN(4);		/* location in binary */
189	. = PAGE_OFFSET + TEXT_OFFSET;
190#else
191	__init_end = .;
192	. = ALIGN(THREAD_SIZE);
193	__data_loc = .;
194#endif
195
196	.data : AT(__data_loc) {
197		_data = .;		/* address in memory */
198		_sdata = .;
199
200		/*
201		 * first, the init task union, aligned
202		 * to an 8192 byte boundary.
203		 */
204		INIT_TASK_DATA(THREAD_SIZE)
205
206#ifdef CONFIG_XIP_KERNEL
207		. = ALIGN(PAGE_SIZE);
208		__init_begin = .;
209		INIT_DATA
210		ARM_EXIT_KEEP(EXIT_DATA)
211		. = ALIGN(PAGE_SIZE);
212		__init_end = .;
213#endif
214
215		NOSAVE_DATA
216		CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES)
217		READ_MOSTLY_DATA(L1_CACHE_BYTES)
218
219		/*
220		 * The exception fixup table (might need resorting at runtime)
221		 */
222		. = ALIGN(4);
223		__start___ex_table = .;
224#ifdef CONFIG_MMU
225		*(__ex_table)
226#endif
227		__stop___ex_table = .;
228
229		/*
230		 * and the usual data section
231		 */
232		DATA_DATA
233		CONSTRUCTORS
234
235		_edata = .;
236	}
237	_edata_loc = __data_loc + SIZEOF(.data);
238
239#ifdef CONFIG_HAVE_TCM
240        /*
241	 * We align everything to a page boundary so we can
242	 * free it after init has commenced and TCM contents have
243	 * been copied to its destination.
244	 */
245	.tcm_start : {
246		. = ALIGN(PAGE_SIZE);
247		__tcm_start = .;
248		__itcm_start = .;
249	}
250
251	/*
252	 * Link these to the ITCM RAM
253	 * Put VMA to the TCM address and LMA to the common RAM
254	 * and we'll upload the contents from RAM to TCM and free
255	 * the used RAM after that.
256	 */
257	.text_itcm ITCM_OFFSET : AT(__itcm_start)
258	{
259		__sitcm_text = .;
260		*(.tcm.text)
261		*(.tcm.rodata)
262		. = ALIGN(4);
263		__eitcm_text = .;
264	}
265
266	/*
267	 * Reset the dot pointer, this is needed to create the
268	 * relative __dtcm_start below (to be used as extern in code).
269	 */
270	. = ADDR(.tcm_start) + SIZEOF(.tcm_start) + SIZEOF(.text_itcm);
271
272	.dtcm_start : {
273		__dtcm_start = .;
274	}
275
276	/* TODO: add remainder of ITCM as well, that can be used for data! */
277	.data_dtcm DTCM_OFFSET : AT(__dtcm_start)
278	{
279		. = ALIGN(4);
280		__sdtcm_data = .;
281		*(.tcm.data)
282		. = ALIGN(4);
283		__edtcm_data = .;
284	}
285
286	/* Reset the dot pointer or the linker gets confused */
287	. = ADDR(.dtcm_start) + SIZEOF(.data_dtcm);
288
289	/* End marker for freeing TCM copy in linked object */
290	.tcm_end : AT(ADDR(.dtcm_start) + SIZEOF(.data_dtcm)){
291		. = ALIGN(PAGE_SIZE);
292		__tcm_end = .;
293	}
294#endif
295
296	NOTES
297
298	BSS_SECTION(0, 0, 0)
299	_end = .;
300
301	STABS_DEBUG
302	.comment 0 : { *(.comment) }
303}
304
305/*
306 * These must never be empty
307 * If you have to comment these two assert statements out, your
308 * binutils is too old (for other reasons as well)
309 */
310ASSERT((__proc_info_end - __proc_info_begin), "missing CPU support")
311ASSERT((__arch_info_end - __arch_info_begin), "no machine record defined")
312