xref: /openbmc/linux/arch/arm/kernel/vmlinux.lds.S (revision 95e9fd10) 
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#ifdef CONFIG_ARM_UNWIND
118	/*
119	 * Stack unwinding tables
120	 */
121	. = ALIGN(8);
122	.ARM.unwind_idx : {
123		__start_unwind_idx = .;
124		*(.ARM.exidx*)
125		__stop_unwind_idx = .;
126	}
127	.ARM.unwind_tab : {
128		__start_unwind_tab = .;
129		*(.ARM.extab*)
130		__stop_unwind_tab = .;
131	}
132#endif
133
134	_etext = .;			/* End of text and rodata section */
135
136#ifndef CONFIG_XIP_KERNEL
137	. = ALIGN(PAGE_SIZE);
138	__init_begin = .;
139#endif
140
141	INIT_TEXT_SECTION(8)
142	.exit.text : {
143		ARM_EXIT_KEEP(EXIT_TEXT)
144	}
145	.init.proc.info : {
146		ARM_CPU_DISCARD(PROC_INFO)
147	}
148	.init.arch.info : {
149		__arch_info_begin = .;
150		*(.arch.info.init)
151		__arch_info_end = .;
152	}
153	.init.tagtable : {
154		__tagtable_begin = .;
155		*(.taglist.init)
156		__tagtable_end = .;
157	}
158#ifdef CONFIG_SMP_ON_UP
159	.init.smpalt : {
160		__smpalt_begin = .;
161		*(.alt.smp.init)
162		__smpalt_end = .;
163	}
164#endif
165	.init.pv_table : {
166		__pv_table_begin = .;
167		*(.pv_table)
168		__pv_table_end = .;
169	}
170	.init.data : {
171#ifndef CONFIG_XIP_KERNEL
172		INIT_DATA
173#endif
174		INIT_SETUP(16)
175		INIT_CALLS
176		CON_INITCALL
177		SECURITY_INITCALL
178		INIT_RAM_FS
179	}
180#ifndef CONFIG_XIP_KERNEL
181	.exit.data : {
182		ARM_EXIT_KEEP(EXIT_DATA)
183	}
184#endif
185
186#ifdef CONFIG_SMP
187	PERCPU_SECTION(L1_CACHE_BYTES)
188#endif
189
190#ifdef CONFIG_XIP_KERNEL
191	__data_loc = ALIGN(4);		/* location in binary */
192	. = PAGE_OFFSET + TEXT_OFFSET;
193#else
194	__init_end = .;
195	. = ALIGN(THREAD_SIZE);
196	__data_loc = .;
197#endif
198
199	.data : AT(__data_loc) {
200		_data = .;		/* address in memory */
201		_sdata = .;
202
203		/*
204		 * first, the init task union, aligned
205		 * to an 8192 byte boundary.
206		 */
207		INIT_TASK_DATA(THREAD_SIZE)
208
209#ifdef CONFIG_XIP_KERNEL
210		. = ALIGN(PAGE_SIZE);
211		__init_begin = .;
212		INIT_DATA
213		ARM_EXIT_KEEP(EXIT_DATA)
214		. = ALIGN(PAGE_SIZE);
215		__init_end = .;
216#endif
217
218		NOSAVE_DATA
219		CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES)
220		READ_MOSTLY_DATA(L1_CACHE_BYTES)
221
222		/*
223		 * The exception fixup table (might need resorting at runtime)
224		 */
225		. = ALIGN(4);
226		__start___ex_table = .;
227#ifdef CONFIG_MMU
228		*(__ex_table)
229#endif
230		__stop___ex_table = .;
231
232		/*
233		 * and the usual data section
234		 */
235		DATA_DATA
236		CONSTRUCTORS
237
238		_edata = .;
239	}
240	_edata_loc = __data_loc + SIZEOF(.data);
241
242#ifdef CONFIG_HAVE_TCM
243        /*
244	 * We align everything to a page boundary so we can
245	 * free it after init has commenced and TCM contents have
246	 * been copied to its destination.
247	 */
248	.tcm_start : {
249		. = ALIGN(PAGE_SIZE);
250		__tcm_start = .;
251		__itcm_start = .;
252	}
253
254	/*
255	 * Link these to the ITCM RAM
256	 * Put VMA to the TCM address and LMA to the common RAM
257	 * and we'll upload the contents from RAM to TCM and free
258	 * the used RAM after that.
259	 */
260	.text_itcm ITCM_OFFSET : AT(__itcm_start)
261	{
262		__sitcm_text = .;
263		*(.tcm.text)
264		*(.tcm.rodata)
265		. = ALIGN(4);
266		__eitcm_text = .;
267	}
268
269	/*
270	 * Reset the dot pointer, this is needed to create the
271	 * relative __dtcm_start below (to be used as extern in code).
272	 */
273	. = ADDR(.tcm_start) + SIZEOF(.tcm_start) + SIZEOF(.text_itcm);
274
275	.dtcm_start : {
276		__dtcm_start = .;
277	}
278
279	/* TODO: add remainder of ITCM as well, that can be used for data! */
280	.data_dtcm DTCM_OFFSET : AT(__dtcm_start)
281	{
282		. = ALIGN(4);
283		__sdtcm_data = .;
284		*(.tcm.data)
285		. = ALIGN(4);
286		__edtcm_data = .;
287	}
288
289	/* Reset the dot pointer or the linker gets confused */
290	. = ADDR(.dtcm_start) + SIZEOF(.data_dtcm);
291
292	/* End marker for freeing TCM copy in linked object */
293	.tcm_end : AT(ADDR(.dtcm_start) + SIZEOF(.data_dtcm)){
294		. = ALIGN(PAGE_SIZE);
295		__tcm_end = .;
296	}
297#endif
298
299	NOTES
300
301	BSS_SECTION(0, 0, 0)
302	_end = .;
303
304	STABS_DEBUG
305	.comment 0 : { *(.comment) }
306}
307
308/*
309 * These must never be empty
310 * If you have to comment these two assert statements out, your
311 * binutils is too old (for other reasons as well)
312 */
313ASSERT((__proc_info_end - __proc_info_begin), "missing CPU support")
314ASSERT((__arch_info_end - __arch_info_begin), "no machine record defined")
315