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1 /*
2  * Helper macros to support writing architecture specific
3  * linker scripts.
4  *
5  * A minimal linker scripts has following content:
6  * [This is a sample, architectures may have special requiriements]
7  *
8  * OUTPUT_FORMAT(...)
9  * OUTPUT_ARCH(...)
10  * ENTRY(...)
11  * SECTIONS
12  * {
13  *	. = START;
14  *	__init_begin = .;
15  *	HEAD_TEXT_SECTION
16  *	INIT_TEXT_SECTION(PAGE_SIZE)
17  *	INIT_DATA_SECTION(...)
18  *	PERCPU_SECTION(CACHELINE_SIZE)
19  *	__init_end = .;
20  *
21  *	_stext = .;
22  *	TEXT_SECTION = 0
23  *	_etext = .;
24  *
25  *      _sdata = .;
26  *	RO_DATA_SECTION(PAGE_SIZE)
27  *	RW_DATA_SECTION(...)
28  *	_edata = .;
29  *
30  *	EXCEPTION_TABLE(...)
31  *	NOTES
32  *
33  *	BSS_SECTION(0, 0, 0)
34  *	_end = .;
35  *
36  *	STABS_DEBUG
37  *	DWARF_DEBUG
38  *
39  *	DISCARDS		// must be the last
40  * }
41  *
42  * [__init_begin, __init_end] is the init section that may be freed after init
43  * 	// __init_begin and __init_end should be page aligned, so that we can
44  *	// free the whole .init memory
45  * [_stext, _etext] is the text section
46  * [_sdata, _edata] is the data section
47  *
48  * Some of the included output section have their own set of constants.
49  * Examples are: [__initramfs_start, __initramfs_end] for initramfs and
50  *               [__nosave_begin, __nosave_end] for the nosave data
51  */
52 
53 #ifndef LOAD_OFFSET
54 #define LOAD_OFFSET 0
55 #endif
56 
57 #include <linux/export.h>
58 
59 /* Align . to a 8 byte boundary equals to maximum function alignment. */
60 #define ALIGN_FUNCTION()  . = ALIGN(8)
61 
62 /*
63  * Align to a 32 byte boundary equal to the
64  * alignment gcc 4.5 uses for a struct
65  */
66 #define STRUCT_ALIGNMENT 32
67 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
68 
69 /* The actual configuration determine if the init/exit sections
70  * are handled as text/data or they can be discarded (which
71  * often happens at runtime)
72  */
73 #ifdef CONFIG_HOTPLUG_CPU
74 #define CPU_KEEP(sec)    *(.cpu##sec)
75 #define CPU_DISCARD(sec)
76 #else
77 #define CPU_KEEP(sec)
78 #define CPU_DISCARD(sec) *(.cpu##sec)
79 #endif
80 
81 #if defined(CONFIG_MEMORY_HOTPLUG)
82 #define MEM_KEEP(sec)    *(.mem##sec)
83 #define MEM_DISCARD(sec)
84 #else
85 #define MEM_KEEP(sec)
86 #define MEM_DISCARD(sec) *(.mem##sec)
87 #endif
88 
89 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
90 #define MCOUNT_REC()	. = ALIGN(8);				\
91 			VMLINUX_SYMBOL(__start_mcount_loc) = .; \
92 			*(__mcount_loc)				\
93 			VMLINUX_SYMBOL(__stop_mcount_loc) = .;
94 #else
95 #define MCOUNT_REC()
96 #endif
97 
98 #ifdef CONFIG_TRACE_BRANCH_PROFILING
99 #define LIKELY_PROFILE()	VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \
100 				*(_ftrace_annotated_branch)			      \
101 				VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .;
102 #else
103 #define LIKELY_PROFILE()
104 #endif
105 
106 #ifdef CONFIG_PROFILE_ALL_BRANCHES
107 #define BRANCH_PROFILE()	VMLINUX_SYMBOL(__start_branch_profile) = .;   \
108 				*(_ftrace_branch)			      \
109 				VMLINUX_SYMBOL(__stop_branch_profile) = .;
110 #else
111 #define BRANCH_PROFILE()
112 #endif
113 
114 #ifdef CONFIG_KPROBES
115 #define KPROBE_BLACKLIST()	. = ALIGN(8);				      \
116 				VMLINUX_SYMBOL(__start_kprobe_blacklist) = .; \
117 				*(_kprobe_blacklist)			      \
118 				VMLINUX_SYMBOL(__stop_kprobe_blacklist) = .;
119 #else
120 #define KPROBE_BLACKLIST()
121 #endif
122 
123 #ifdef CONFIG_EVENT_TRACING
124 #define FTRACE_EVENTS()	. = ALIGN(8);					\
125 			VMLINUX_SYMBOL(__start_ftrace_events) = .;	\
126 			*(_ftrace_events)				\
127 			VMLINUX_SYMBOL(__stop_ftrace_events) = .;
128 #else
129 #define FTRACE_EVENTS()
130 #endif
131 
132 #ifdef CONFIG_TRACING
133 #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .;      \
134 			 *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \
135 			 VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;
136 #define TRACEPOINT_STR() VMLINUX_SYMBOL(__start___tracepoint_str) = .;	\
137 			 *(__tracepoint_str) /* Trace_printk fmt' pointer */ \
138 			 VMLINUX_SYMBOL(__stop___tracepoint_str) = .;
139 #else
140 #define TRACE_PRINTKS()
141 #define TRACEPOINT_STR()
142 #endif
143 
144 #ifdef CONFIG_FTRACE_SYSCALLS
145 #define TRACE_SYSCALLS() . = ALIGN(8);					\
146 			 VMLINUX_SYMBOL(__start_syscalls_metadata) = .;	\
147 			 *(__syscalls_metadata)				\
148 			 VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
149 #else
150 #define TRACE_SYSCALLS()
151 #endif
152 
153 
154 #define ___OF_TABLE(cfg, name)	_OF_TABLE_##cfg(name)
155 #define __OF_TABLE(cfg, name)	___OF_TABLE(cfg, name)
156 #define OF_TABLE(cfg, name)	__OF_TABLE(config_enabled(cfg), name)
157 #define _OF_TABLE_0(name)
158 #define _OF_TABLE_1(name)						\
159 	. = ALIGN(8);							\
160 	VMLINUX_SYMBOL(__##name##_of_table) = .;			\
161 	*(__##name##_of_table)						\
162 	*(__##name##_of_table_end)
163 
164 #define CLKSRC_OF_TABLES()	OF_TABLE(CONFIG_CLKSRC_OF, clksrc)
165 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
166 #define CLK_OF_TABLES()		OF_TABLE(CONFIG_COMMON_CLK, clk)
167 #define RESERVEDMEM_OF_TABLES()	OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
168 #define CPU_METHOD_OF_TABLES()	OF_TABLE(CONFIG_SMP, cpu_method)
169 #define EARLYCON_OF_TABLES()	OF_TABLE(CONFIG_SERIAL_EARLYCON, earlycon)
170 
171 #define KERNEL_DTB()							\
172 	STRUCT_ALIGN();							\
173 	VMLINUX_SYMBOL(__dtb_start) = .;				\
174 	*(.dtb.init.rodata)						\
175 	VMLINUX_SYMBOL(__dtb_end) = .;
176 
177 /* .data section */
178 #define DATA_DATA							\
179 	*(.data)							\
180 	*(.ref.data)							\
181 	*(.data..shared_aligned) /* percpu related */			\
182 	MEM_KEEP(init.data)						\
183 	MEM_KEEP(exit.data)						\
184 	*(.data.unlikely)						\
185 	STRUCT_ALIGN();							\
186 	*(__tracepoints)						\
187 	/* implement dynamic printk debug */				\
188 	. = ALIGN(8);                                                   \
189 	VMLINUX_SYMBOL(__start___jump_table) = .;                       \
190 	*(__jump_table)                                                 \
191 	VMLINUX_SYMBOL(__stop___jump_table) = .;                        \
192 	. = ALIGN(8);							\
193 	VMLINUX_SYMBOL(__start___verbose) = .;                          \
194 	*(__verbose)                                                    \
195 	VMLINUX_SYMBOL(__stop___verbose) = .;				\
196 	LIKELY_PROFILE()		       				\
197 	BRANCH_PROFILE()						\
198 	TRACE_PRINTKS()							\
199 	TRACEPOINT_STR()
200 
201 /*
202  * Data section helpers
203  */
204 #define NOSAVE_DATA							\
205 	. = ALIGN(PAGE_SIZE);						\
206 	VMLINUX_SYMBOL(__nosave_begin) = .;				\
207 	*(.data..nosave)						\
208 	. = ALIGN(PAGE_SIZE);						\
209 	VMLINUX_SYMBOL(__nosave_end) = .;
210 
211 #define PAGE_ALIGNED_DATA(page_align)					\
212 	. = ALIGN(page_align);						\
213 	*(.data..page_aligned)
214 
215 #define READ_MOSTLY_DATA(align)						\
216 	. = ALIGN(align);						\
217 	*(.data..read_mostly)						\
218 	. = ALIGN(align);
219 
220 #define CACHELINE_ALIGNED_DATA(align)					\
221 	. = ALIGN(align);						\
222 	*(.data..cacheline_aligned)
223 
224 #define INIT_TASK_DATA(align)						\
225 	. = ALIGN(align);						\
226 	*(.data..init_task)
227 
228 /*
229  * Allow architectures to handle ro_after_init data on their
230  * own by defining an empty RO_AFTER_INIT_DATA.
231  */
232 #ifndef RO_AFTER_INIT_DATA
233 #define RO_AFTER_INIT_DATA *(.data..ro_after_init)
234 #endif
235 
236 /*
237  * Read only Data
238  */
239 #define RO_DATA_SECTION(align)						\
240 	. = ALIGN((align));						\
241 	.rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {		\
242 		VMLINUX_SYMBOL(__start_rodata) = .;			\
243 		*(.rodata) *(.rodata.*)					\
244 		RO_AFTER_INIT_DATA	/* Read only after init */	\
245 		*(__vermagic)		/* Kernel version magic */	\
246 		. = ALIGN(8);						\
247 		VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .;		\
248 		*(__tracepoints_ptrs)	/* Tracepoints: pointer array */\
249 		VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .;		\
250 		*(__tracepoints_strings)/* Tracepoints: strings */	\
251 	}								\
252 									\
253 	.rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {		\
254 		*(.rodata1)						\
255 	}								\
256 									\
257 	BUG_TABLE							\
258 									\
259 	/* PCI quirks */						\
260 	.pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {	\
261 		VMLINUX_SYMBOL(__start_pci_fixups_early) = .;		\
262 		*(.pci_fixup_early)					\
263 		VMLINUX_SYMBOL(__end_pci_fixups_early) = .;		\
264 		VMLINUX_SYMBOL(__start_pci_fixups_header) = .;		\
265 		*(.pci_fixup_header)					\
266 		VMLINUX_SYMBOL(__end_pci_fixups_header) = .;		\
267 		VMLINUX_SYMBOL(__start_pci_fixups_final) = .;		\
268 		*(.pci_fixup_final)					\
269 		VMLINUX_SYMBOL(__end_pci_fixups_final) = .;		\
270 		VMLINUX_SYMBOL(__start_pci_fixups_enable) = .;		\
271 		*(.pci_fixup_enable)					\
272 		VMLINUX_SYMBOL(__end_pci_fixups_enable) = .;		\
273 		VMLINUX_SYMBOL(__start_pci_fixups_resume) = .;		\
274 		*(.pci_fixup_resume)					\
275 		VMLINUX_SYMBOL(__end_pci_fixups_resume) = .;		\
276 		VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .;	\
277 		*(.pci_fixup_resume_early)				\
278 		VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .;	\
279 		VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .;		\
280 		*(.pci_fixup_suspend)					\
281 		VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .;		\
282 		VMLINUX_SYMBOL(__start_pci_fixups_suspend_late) = .;	\
283 		*(.pci_fixup_suspend_late)				\
284 		VMLINUX_SYMBOL(__end_pci_fixups_suspend_late) = .;	\
285 	}								\
286 									\
287 	/* Built-in firmware blobs */					\
288 	.builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {	\
289 		VMLINUX_SYMBOL(__start_builtin_fw) = .;			\
290 		*(.builtin_fw)						\
291 		VMLINUX_SYMBOL(__end_builtin_fw) = .;			\
292 	}								\
293 									\
294 	TRACEDATA							\
295 									\
296 	/* Kernel symbol table: Normal symbols */			\
297 	__ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {		\
298 		VMLINUX_SYMBOL(__start___ksymtab) = .;			\
299 		*(SORT(___ksymtab+*))					\
300 		VMLINUX_SYMBOL(__stop___ksymtab) = .;			\
301 	}								\
302 									\
303 	/* Kernel symbol table: GPL-only symbols */			\
304 	__ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {	\
305 		VMLINUX_SYMBOL(__start___ksymtab_gpl) = .;		\
306 		*(SORT(___ksymtab_gpl+*))				\
307 		VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .;		\
308 	}								\
309 									\
310 	/* Kernel symbol table: Normal unused symbols */		\
311 	__ksymtab_unused  : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) {	\
312 		VMLINUX_SYMBOL(__start___ksymtab_unused) = .;		\
313 		*(SORT(___ksymtab_unused+*))				\
314 		VMLINUX_SYMBOL(__stop___ksymtab_unused) = .;		\
315 	}								\
316 									\
317 	/* Kernel symbol table: GPL-only unused symbols */		\
318 	__ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
319 		VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .;	\
320 		*(SORT(___ksymtab_unused_gpl+*))			\
321 		VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .;	\
322 	}								\
323 									\
324 	/* Kernel symbol table: GPL-future-only symbols */		\
325 	__ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
326 		VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .;	\
327 		*(SORT(___ksymtab_gpl_future+*))			\
328 		VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .;	\
329 	}								\
330 									\
331 	/* Kernel symbol table: Normal symbols */			\
332 	__kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {		\
333 		VMLINUX_SYMBOL(__start___kcrctab) = .;			\
334 		*(SORT(___kcrctab+*))					\
335 		VMLINUX_SYMBOL(__stop___kcrctab) = .;			\
336 	}								\
337 									\
338 	/* Kernel symbol table: GPL-only symbols */			\
339 	__kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {	\
340 		VMLINUX_SYMBOL(__start___kcrctab_gpl) = .;		\
341 		*(SORT(___kcrctab_gpl+*))				\
342 		VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .;		\
343 	}								\
344 									\
345 	/* Kernel symbol table: Normal unused symbols */		\
346 	__kcrctab_unused  : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) {	\
347 		VMLINUX_SYMBOL(__start___kcrctab_unused) = .;		\
348 		*(SORT(___kcrctab_unused+*))				\
349 		VMLINUX_SYMBOL(__stop___kcrctab_unused) = .;		\
350 	}								\
351 									\
352 	/* Kernel symbol table: GPL-only unused symbols */		\
353 	__kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
354 		VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .;	\
355 		*(SORT(___kcrctab_unused_gpl+*))			\
356 		VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .;	\
357 	}								\
358 									\
359 	/* Kernel symbol table: GPL-future-only symbols */		\
360 	__kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
361 		VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .;	\
362 		*(SORT(___kcrctab_gpl_future+*))			\
363 		VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .;	\
364 	}								\
365 									\
366 	/* Kernel symbol table: strings */				\
367         __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) {	\
368 		*(__ksymtab_strings)					\
369 	}								\
370 									\
371 	/* __*init sections */						\
372 	__init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {		\
373 		*(.ref.rodata)						\
374 		MEM_KEEP(init.rodata)					\
375 		MEM_KEEP(exit.rodata)					\
376 	}								\
377 									\
378 	/* Built-in module parameters. */				\
379 	__param : AT(ADDR(__param) - LOAD_OFFSET) {			\
380 		VMLINUX_SYMBOL(__start___param) = .;			\
381 		*(__param)						\
382 		VMLINUX_SYMBOL(__stop___param) = .;			\
383 	}								\
384 									\
385 	/* Built-in module versions. */					\
386 	__modver : AT(ADDR(__modver) - LOAD_OFFSET) {			\
387 		VMLINUX_SYMBOL(__start___modver) = .;			\
388 		*(__modver)						\
389 		VMLINUX_SYMBOL(__stop___modver) = .;			\
390 		. = ALIGN((align));					\
391 		VMLINUX_SYMBOL(__end_rodata) = .;			\
392 	}								\
393 	. = ALIGN((align));
394 
395 /* RODATA & RO_DATA provided for backward compatibility.
396  * All archs are supposed to use RO_DATA() */
397 #define RODATA          RO_DATA_SECTION(4096)
398 #define RO_DATA(align)  RO_DATA_SECTION(align)
399 
400 #define SECURITY_INIT							\
401 	.security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
402 		VMLINUX_SYMBOL(__security_initcall_start) = .;		\
403 		*(.security_initcall.init) 				\
404 		VMLINUX_SYMBOL(__security_initcall_end) = .;		\
405 	}
406 
407 /* .text section. Map to function alignment to avoid address changes
408  * during second ld run in second ld pass when generating System.map */
409 #define TEXT_TEXT							\
410 		ALIGN_FUNCTION();					\
411 		*(.text.hot)						\
412 		*(.text)						\
413 		*(.ref.text)						\
414 	MEM_KEEP(init.text)						\
415 	MEM_KEEP(exit.text)						\
416 		*(.text.unlikely)
417 
418 
419 /* sched.text is aling to function alignment to secure we have same
420  * address even at second ld pass when generating System.map */
421 #define SCHED_TEXT							\
422 		ALIGN_FUNCTION();					\
423 		VMLINUX_SYMBOL(__sched_text_start) = .;			\
424 		*(.sched.text)						\
425 		VMLINUX_SYMBOL(__sched_text_end) = .;
426 
427 /* spinlock.text is aling to function alignment to secure we have same
428  * address even at second ld pass when generating System.map */
429 #define LOCK_TEXT							\
430 		ALIGN_FUNCTION();					\
431 		VMLINUX_SYMBOL(__lock_text_start) = .;			\
432 		*(.spinlock.text)					\
433 		VMLINUX_SYMBOL(__lock_text_end) = .;
434 
435 #define KPROBES_TEXT							\
436 		ALIGN_FUNCTION();					\
437 		VMLINUX_SYMBOL(__kprobes_text_start) = .;		\
438 		*(.kprobes.text)					\
439 		VMLINUX_SYMBOL(__kprobes_text_end) = .;
440 
441 #define ENTRY_TEXT							\
442 		ALIGN_FUNCTION();					\
443 		VMLINUX_SYMBOL(__entry_text_start) = .;			\
444 		*(.entry.text)						\
445 		VMLINUX_SYMBOL(__entry_text_end) = .;
446 
447 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
448 #define IRQENTRY_TEXT							\
449 		ALIGN_FUNCTION();					\
450 		VMLINUX_SYMBOL(__irqentry_text_start) = .;		\
451 		*(.irqentry.text)					\
452 		VMLINUX_SYMBOL(__irqentry_text_end) = .;
453 #else
454 #define IRQENTRY_TEXT
455 #endif
456 
457 /* Section used for early init (in .S files) */
458 #define HEAD_TEXT  *(.head.text)
459 
460 #define HEAD_TEXT_SECTION							\
461 	.head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {		\
462 		HEAD_TEXT						\
463 	}
464 
465 /*
466  * Exception table
467  */
468 #define EXCEPTION_TABLE(align)						\
469 	. = ALIGN(align);						\
470 	__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {		\
471 		VMLINUX_SYMBOL(__start___ex_table) = .;			\
472 		*(__ex_table)						\
473 		VMLINUX_SYMBOL(__stop___ex_table) = .;			\
474 	}
475 
476 /*
477  * Init task
478  */
479 #define INIT_TASK_DATA_SECTION(align)					\
480 	. = ALIGN(align);						\
481 	.data..init_task :  AT(ADDR(.data..init_task) - LOAD_OFFSET) {	\
482 		INIT_TASK_DATA(align)					\
483 	}
484 
485 #ifdef CONFIG_CONSTRUCTORS
486 #define KERNEL_CTORS()	. = ALIGN(8);			   \
487 			VMLINUX_SYMBOL(__ctors_start) = .; \
488 			*(.ctors)			   \
489 			*(.init_array)			   \
490 			VMLINUX_SYMBOL(__ctors_end) = .;
491 #else
492 #define KERNEL_CTORS()
493 #endif
494 
495 /* init and exit section handling */
496 #define INIT_DATA							\
497 	*(.init.data)							\
498 	MEM_DISCARD(init.data)						\
499 	KERNEL_CTORS()							\
500 	MCOUNT_REC()							\
501 	*(.init.rodata)							\
502 	FTRACE_EVENTS()							\
503 	TRACE_SYSCALLS()						\
504 	KPROBE_BLACKLIST()						\
505 	MEM_DISCARD(init.rodata)					\
506 	CLK_OF_TABLES()							\
507 	RESERVEDMEM_OF_TABLES()						\
508 	CLKSRC_OF_TABLES()						\
509 	CPU_METHOD_OF_TABLES()						\
510 	KERNEL_DTB()							\
511 	IRQCHIP_OF_MATCH_TABLE()					\
512 	EARLYCON_OF_TABLES()
513 
514 #define INIT_TEXT							\
515 	*(.init.text)							\
516 	MEM_DISCARD(init.text)
517 
518 #define EXIT_DATA							\
519 	*(.exit.data)							\
520 	MEM_DISCARD(exit.data)						\
521 	MEM_DISCARD(exit.rodata)
522 
523 #define EXIT_TEXT							\
524 	*(.exit.text)							\
525 	MEM_DISCARD(exit.text)
526 
527 #define EXIT_CALL							\
528 	*(.exitcall.exit)
529 
530 /*
531  * bss (Block Started by Symbol) - uninitialized data
532  * zeroed during startup
533  */
534 #define SBSS(sbss_align)						\
535 	. = ALIGN(sbss_align);						\
536 	.sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {				\
537 		*(.sbss)						\
538 		*(.scommon)						\
539 	}
540 
541 /*
542  * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
543  * sections to the front of bss.
544  */
545 #ifndef BSS_FIRST_SECTIONS
546 #define BSS_FIRST_SECTIONS
547 #endif
548 
549 #define BSS(bss_align)							\
550 	. = ALIGN(bss_align);						\
551 	.bss : AT(ADDR(.bss) - LOAD_OFFSET) {				\
552 		BSS_FIRST_SECTIONS					\
553 		*(.bss..page_aligned)					\
554 		*(.dynbss)						\
555 		*(.bss)							\
556 		*(COMMON)						\
557 	}
558 
559 /*
560  * DWARF debug sections.
561  * Symbols in the DWARF debugging sections are relative to
562  * the beginning of the section so we begin them at 0.
563  */
564 #define DWARF_DEBUG							\
565 		/* DWARF 1 */						\
566 		.debug          0 : { *(.debug) }			\
567 		.line           0 : { *(.line) }			\
568 		/* GNU DWARF 1 extensions */				\
569 		.debug_srcinfo  0 : { *(.debug_srcinfo) }		\
570 		.debug_sfnames  0 : { *(.debug_sfnames) }		\
571 		/* DWARF 1.1 and DWARF 2 */				\
572 		.debug_aranges  0 : { *(.debug_aranges) }		\
573 		.debug_pubnames 0 : { *(.debug_pubnames) }		\
574 		/* DWARF 2 */						\
575 		.debug_info     0 : { *(.debug_info			\
576 				.gnu.linkonce.wi.*) }			\
577 		.debug_abbrev   0 : { *(.debug_abbrev) }		\
578 		.debug_line     0 : { *(.debug_line) }			\
579 		.debug_frame    0 : { *(.debug_frame) }			\
580 		.debug_str      0 : { *(.debug_str) }			\
581 		.debug_loc      0 : { *(.debug_loc) }			\
582 		.debug_macinfo  0 : { *(.debug_macinfo) }		\
583 		/* SGI/MIPS DWARF 2 extensions */			\
584 		.debug_weaknames 0 : { *(.debug_weaknames) }		\
585 		.debug_funcnames 0 : { *(.debug_funcnames) }		\
586 		.debug_typenames 0 : { *(.debug_typenames) }		\
587 		.debug_varnames  0 : { *(.debug_varnames) }		\
588 
589 		/* Stabs debugging sections.  */
590 #define STABS_DEBUG							\
591 		.stab 0 : { *(.stab) }					\
592 		.stabstr 0 : { *(.stabstr) }				\
593 		.stab.excl 0 : { *(.stab.excl) }			\
594 		.stab.exclstr 0 : { *(.stab.exclstr) }			\
595 		.stab.index 0 : { *(.stab.index) }			\
596 		.stab.indexstr 0 : { *(.stab.indexstr) }		\
597 		.comment 0 : { *(.comment) }
598 
599 #ifdef CONFIG_GENERIC_BUG
600 #define BUG_TABLE							\
601 	. = ALIGN(8);							\
602 	__bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {		\
603 		VMLINUX_SYMBOL(__start___bug_table) = .;		\
604 		*(__bug_table)						\
605 		VMLINUX_SYMBOL(__stop___bug_table) = .;			\
606 	}
607 #else
608 #define BUG_TABLE
609 #endif
610 
611 #ifdef CONFIG_PM_TRACE
612 #define TRACEDATA							\
613 	. = ALIGN(4);							\
614 	.tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {		\
615 		VMLINUX_SYMBOL(__tracedata_start) = .;			\
616 		*(.tracedata)						\
617 		VMLINUX_SYMBOL(__tracedata_end) = .;			\
618 	}
619 #else
620 #define TRACEDATA
621 #endif
622 
623 #define NOTES								\
624 	.notes : AT(ADDR(.notes) - LOAD_OFFSET) {			\
625 		VMLINUX_SYMBOL(__start_notes) = .;			\
626 		*(.note.*)						\
627 		VMLINUX_SYMBOL(__stop_notes) = .;			\
628 	}
629 
630 #define INIT_SETUP(initsetup_align)					\
631 		. = ALIGN(initsetup_align);				\
632 		VMLINUX_SYMBOL(__setup_start) = .;			\
633 		*(.init.setup)						\
634 		VMLINUX_SYMBOL(__setup_end) = .;
635 
636 #define INIT_CALLS_LEVEL(level)						\
637 		VMLINUX_SYMBOL(__initcall##level##_start) = .;		\
638 		*(.initcall##level##.init)				\
639 		*(.initcall##level##s.init)				\
640 
641 #define INIT_CALLS							\
642 		VMLINUX_SYMBOL(__initcall_start) = .;			\
643 		*(.initcallearly.init)					\
644 		INIT_CALLS_LEVEL(0)					\
645 		INIT_CALLS_LEVEL(1)					\
646 		INIT_CALLS_LEVEL(2)					\
647 		INIT_CALLS_LEVEL(3)					\
648 		INIT_CALLS_LEVEL(4)					\
649 		INIT_CALLS_LEVEL(5)					\
650 		INIT_CALLS_LEVEL(rootfs)				\
651 		INIT_CALLS_LEVEL(6)					\
652 		INIT_CALLS_LEVEL(7)					\
653 		VMLINUX_SYMBOL(__initcall_end) = .;
654 
655 #define CON_INITCALL							\
656 		VMLINUX_SYMBOL(__con_initcall_start) = .;		\
657 		*(.con_initcall.init)					\
658 		VMLINUX_SYMBOL(__con_initcall_end) = .;
659 
660 #define SECURITY_INITCALL						\
661 		VMLINUX_SYMBOL(__security_initcall_start) = .;		\
662 		*(.security_initcall.init)				\
663 		VMLINUX_SYMBOL(__security_initcall_end) = .;
664 
665 #ifdef CONFIG_BLK_DEV_INITRD
666 #define INIT_RAM_FS							\
667 	. = ALIGN(4);							\
668 	VMLINUX_SYMBOL(__initramfs_start) = .;				\
669 	*(.init.ramfs)							\
670 	. = ALIGN(8);							\
671 	*(.init.ramfs.info)
672 #else
673 #define INIT_RAM_FS
674 #endif
675 
676 /*
677  * Default discarded sections.
678  *
679  * Some archs want to discard exit text/data at runtime rather than
680  * link time due to cross-section references such as alt instructions,
681  * bug table, eh_frame, etc.  DISCARDS must be the last of output
682  * section definitions so that such archs put those in earlier section
683  * definitions.
684  */
685 #define DISCARDS							\
686 	/DISCARD/ : {							\
687 	EXIT_TEXT							\
688 	EXIT_DATA							\
689 	EXIT_CALL							\
690 	*(.discard)							\
691 	*(.discard.*)							\
692 	}
693 
694 /**
695  * PERCPU_INPUT - the percpu input sections
696  * @cacheline: cacheline size
697  *
698  * The core percpu section names and core symbols which do not rely
699  * directly upon load addresses.
700  *
701  * @cacheline is used to align subsections to avoid false cacheline
702  * sharing between subsections for different purposes.
703  */
704 #define PERCPU_INPUT(cacheline)						\
705 	VMLINUX_SYMBOL(__per_cpu_start) = .;				\
706 	*(.data..percpu..first)						\
707 	. = ALIGN(PAGE_SIZE);						\
708 	*(.data..percpu..page_aligned)					\
709 	. = ALIGN(cacheline);						\
710 	*(.data..percpu..read_mostly)					\
711 	. = ALIGN(cacheline);						\
712 	*(.data..percpu)						\
713 	*(.data..percpu..shared_aligned)				\
714 	VMLINUX_SYMBOL(__per_cpu_end) = .;
715 
716 /**
717  * PERCPU_VADDR - define output section for percpu area
718  * @cacheline: cacheline size
719  * @vaddr: explicit base address (optional)
720  * @phdr: destination PHDR (optional)
721  *
722  * Macro which expands to output section for percpu area.
723  *
724  * @cacheline is used to align subsections to avoid false cacheline
725  * sharing between subsections for different purposes.
726  *
727  * If @vaddr is not blank, it specifies explicit base address and all
728  * percpu symbols will be offset from the given address.  If blank,
729  * @vaddr always equals @laddr + LOAD_OFFSET.
730  *
731  * @phdr defines the output PHDR to use if not blank.  Be warned that
732  * output PHDR is sticky.  If @phdr is specified, the next output
733  * section in the linker script will go there too.  @phdr should have
734  * a leading colon.
735  *
736  * Note that this macros defines __per_cpu_load as an absolute symbol.
737  * If there is no need to put the percpu section at a predetermined
738  * address, use PERCPU_SECTION.
739  */
740 #define PERCPU_VADDR(cacheline, vaddr, phdr)				\
741 	VMLINUX_SYMBOL(__per_cpu_load) = .;				\
742 	.data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load)		\
743 				- LOAD_OFFSET) {			\
744 		PERCPU_INPUT(cacheline)					\
745 	} phdr								\
746 	. = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
747 
748 /**
749  * PERCPU_SECTION - define output section for percpu area, simple version
750  * @cacheline: cacheline size
751  *
752  * Align to PAGE_SIZE and outputs output section for percpu area.  This
753  * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
754  * __per_cpu_start will be identical.
755  *
756  * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
757  * except that __per_cpu_load is defined as a relative symbol against
758  * .data..percpu which is required for relocatable x86_32 configuration.
759  */
760 #define PERCPU_SECTION(cacheline)					\
761 	. = ALIGN(PAGE_SIZE);						\
762 	.data..percpu	: AT(ADDR(.data..percpu) - LOAD_OFFSET) {	\
763 		VMLINUX_SYMBOL(__per_cpu_load) = .;			\
764 		PERCPU_INPUT(cacheline)					\
765 	}
766 
767 
768 /*
769  * Definition of the high level *_SECTION macros
770  * They will fit only a subset of the architectures
771  */
772 
773 
774 /*
775  * Writeable data.
776  * All sections are combined in a single .data section.
777  * The sections following CONSTRUCTORS are arranged so their
778  * typical alignment matches.
779  * A cacheline is typical/always less than a PAGE_SIZE so
780  * the sections that has this restriction (or similar)
781  * is located before the ones requiring PAGE_SIZE alignment.
782  * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
783  * matches the requirement of PAGE_ALIGNED_DATA.
784  *
785  * use 0 as page_align if page_aligned data is not used */
786 #define RW_DATA_SECTION(cacheline, pagealigned, inittask)		\
787 	. = ALIGN(PAGE_SIZE);						\
788 	.data : AT(ADDR(.data) - LOAD_OFFSET) {				\
789 		INIT_TASK_DATA(inittask)				\
790 		NOSAVE_DATA						\
791 		PAGE_ALIGNED_DATA(pagealigned)				\
792 		CACHELINE_ALIGNED_DATA(cacheline)			\
793 		READ_MOSTLY_DATA(cacheline)				\
794 		DATA_DATA						\
795 		CONSTRUCTORS						\
796 	}
797 
798 #define INIT_TEXT_SECTION(inittext_align)				\
799 	. = ALIGN(inittext_align);					\
800 	.init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {		\
801 		VMLINUX_SYMBOL(_sinittext) = .;				\
802 		INIT_TEXT						\
803 		VMLINUX_SYMBOL(_einittext) = .;				\
804 	}
805 
806 #define INIT_DATA_SECTION(initsetup_align)				\
807 	.init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {		\
808 		INIT_DATA						\
809 		INIT_SETUP(initsetup_align)				\
810 		INIT_CALLS						\
811 		CON_INITCALL						\
812 		SECURITY_INITCALL					\
813 		INIT_RAM_FS						\
814 	}
815 
816 #define BSS_SECTION(sbss_align, bss_align, stop_align)			\
817 	. = ALIGN(sbss_align);						\
818 	VMLINUX_SYMBOL(__bss_start) = .;				\
819 	SBSS(sbss_align)						\
820 	BSS(bss_align)							\
821 	. = ALIGN(stop_align);						\
822 	VMLINUX_SYMBOL(__bss_stop) = .;
823