xref: /openbmc/linux/arch/arm/kernel/vmlinux.lds.S (revision 4a44a19b) 
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	. = ALIGN(32);							\
24	VMLINUX_SYMBOL(__hyp_idmap_text_start) = .;			\
25	*(.hyp.idmap.text)						\
26	VMLINUX_SYMBOL(__hyp_idmap_text_end) = .;
27
28#ifdef CONFIG_HOTPLUG_CPU
29#define ARM_CPU_DISCARD(x)
30#define ARM_CPU_KEEP(x)		x
31#else
32#define ARM_CPU_DISCARD(x)	x
33#define ARM_CPU_KEEP(x)
34#endif
35
36#if (defined(CONFIG_SMP_ON_UP) && !defined(CONFIG_DEBUG_SPINLOCK)) || \
37	defined(CONFIG_GENERIC_BUG)
38#define ARM_EXIT_KEEP(x)	x
39#define ARM_EXIT_DISCARD(x)
40#else
41#define ARM_EXIT_KEEP(x)
42#define ARM_EXIT_DISCARD(x)	x
43#endif
44
45OUTPUT_ARCH(arm)
46ENTRY(stext)
47
48#ifndef __ARMEB__
49jiffies = jiffies_64;
50#else
51jiffies = jiffies_64 + 4;
52#endif
53
54SECTIONS
55{
56	/*
57	 * XXX: The linker does not define how output sections are
58	 * assigned to input sections when there are multiple statements
59	 * matching the same input section name.  There is no documented
60	 * order of matching.
61	 *
62	 * unwind exit sections must be discarded before the rest of the
63	 * unwind sections get included.
64	 */
65	/DISCARD/ : {
66		*(.ARM.exidx.exit.text)
67		*(.ARM.extab.exit.text)
68		ARM_CPU_DISCARD(*(.ARM.exidx.cpuexit.text))
69		ARM_CPU_DISCARD(*(.ARM.extab.cpuexit.text))
70		ARM_EXIT_DISCARD(EXIT_TEXT)
71		ARM_EXIT_DISCARD(EXIT_DATA)
72		EXIT_CALL
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	NOTES
144
145	_etext = .;			/* End of text and rodata section */
146
147#ifndef CONFIG_XIP_KERNEL
148	. = ALIGN(PAGE_SIZE);
149	__init_begin = .;
150#endif
151	/*
152	 * The vectors and stubs are relocatable code, and the
153	 * only thing that matters is their relative offsets
154	 */
155	__vectors_start = .;
156	.vectors 0 : AT(__vectors_start) {
157		*(.vectors)
158	}
159	. = __vectors_start + SIZEOF(.vectors);
160	__vectors_end = .;
161
162	__stubs_start = .;
163	.stubs 0x1000 : AT(__stubs_start) {
164		*(.stubs)
165	}
166	. = __stubs_start + SIZEOF(.stubs);
167	__stubs_end = .;
168
169	INIT_TEXT_SECTION(8)
170	.exit.text : {
171		ARM_EXIT_KEEP(EXIT_TEXT)
172	}
173	.init.proc.info : {
174		ARM_CPU_DISCARD(PROC_INFO)
175	}
176	.init.arch.info : {
177		__arch_info_begin = .;
178		*(.arch.info.init)
179		__arch_info_end = .;
180	}
181	.init.tagtable : {
182		__tagtable_begin = .;
183		*(.taglist.init)
184		__tagtable_end = .;
185	}
186#ifdef CONFIG_SMP_ON_UP
187	.init.smpalt : {
188		__smpalt_begin = .;
189		*(.alt.smp.init)
190		__smpalt_end = .;
191	}
192#endif
193	.init.pv_table : {
194		__pv_table_begin = .;
195		*(.pv_table)
196		__pv_table_end = .;
197	}
198	.init.data : {
199#ifndef CONFIG_XIP_KERNEL
200		INIT_DATA
201#endif
202		INIT_SETUP(16)
203		INIT_CALLS
204		CON_INITCALL
205		SECURITY_INITCALL
206		INIT_RAM_FS
207	}
208#ifndef CONFIG_XIP_KERNEL
209	.exit.data : {
210		ARM_EXIT_KEEP(EXIT_DATA)
211	}
212#endif
213
214#ifdef CONFIG_SMP
215	PERCPU_SECTION(L1_CACHE_BYTES)
216#endif
217
218#ifdef CONFIG_XIP_KERNEL
219	__data_loc = ALIGN(4);		/* location in binary */
220	. = PAGE_OFFSET + TEXT_OFFSET;
221#else
222	. = ALIGN(THREAD_SIZE);
223	__init_end = .;
224	__data_loc = .;
225#endif
226
227	.data : AT(__data_loc) {
228		_data = .;		/* address in memory */
229		_sdata = .;
230
231		/*
232		 * first, the init task union, aligned
233		 * to an 8192 byte boundary.
234		 */
235		INIT_TASK_DATA(THREAD_SIZE)
236
237#ifdef CONFIG_XIP_KERNEL
238		. = ALIGN(PAGE_SIZE);
239		__init_begin = .;
240		INIT_DATA
241		ARM_EXIT_KEEP(EXIT_DATA)
242		. = ALIGN(PAGE_SIZE);
243		__init_end = .;
244#endif
245
246		NOSAVE_DATA
247		CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES)
248		READ_MOSTLY_DATA(L1_CACHE_BYTES)
249
250		/*
251		 * and the usual data section
252		 */
253		DATA_DATA
254		CONSTRUCTORS
255
256		_edata = .;
257	}
258	_edata_loc = __data_loc + SIZEOF(.data);
259
260#ifdef CONFIG_HAVE_TCM
261        /*
262	 * We align everything to a page boundary so we can
263	 * free it after init has commenced and TCM contents have
264	 * been copied to its destination.
265	 */
266	.tcm_start : {
267		. = ALIGN(PAGE_SIZE);
268		__tcm_start = .;
269		__itcm_start = .;
270	}
271
272	/*
273	 * Link these to the ITCM RAM
274	 * Put VMA to the TCM address and LMA to the common RAM
275	 * and we'll upload the contents from RAM to TCM and free
276	 * the used RAM after that.
277	 */
278	.text_itcm ITCM_OFFSET : AT(__itcm_start)
279	{
280		__sitcm_text = .;
281		*(.tcm.text)
282		*(.tcm.rodata)
283		. = ALIGN(4);
284		__eitcm_text = .;
285	}
286
287	/*
288	 * Reset the dot pointer, this is needed to create the
289	 * relative __dtcm_start below (to be used as extern in code).
290	 */
291	. = ADDR(.tcm_start) + SIZEOF(.tcm_start) + SIZEOF(.text_itcm);
292
293	.dtcm_start : {
294		__dtcm_start = .;
295	}
296
297	/* TODO: add remainder of ITCM as well, that can be used for data! */
298	.data_dtcm DTCM_OFFSET : AT(__dtcm_start)
299	{
300		. = ALIGN(4);
301		__sdtcm_data = .;
302		*(.tcm.data)
303		. = ALIGN(4);
304		__edtcm_data = .;
305	}
306
307	/* Reset the dot pointer or the linker gets confused */
308	. = ADDR(.dtcm_start) + SIZEOF(.data_dtcm);
309
310	/* End marker for freeing TCM copy in linked object */
311	.tcm_end : AT(ADDR(.dtcm_start) + SIZEOF(.data_dtcm)){
312		. = ALIGN(PAGE_SIZE);
313		__tcm_end = .;
314	}
315#endif
316
317	BSS_SECTION(0, 0, 0)
318	_end = .;
319
320	STABS_DEBUG
321}
322
323/*
324 * These must never be empty
325 * If you have to comment these two assert statements out, your
326 * binutils is too old (for other reasons as well)
327 */
328ASSERT((__proc_info_end - __proc_info_begin), "missing CPU support")
329ASSERT((__arch_info_end - __arch_info_begin), "no machine record defined")
330/*
331 * The HYP init code can't be more than a page long.
332 * The above comment applies as well.
333 */
334ASSERT(((__hyp_idmap_text_end - __hyp_idmap_text_start) <= PAGE_SIZE), "HYP init code too big")
335