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(PAGE_SIZE)
27  *	RW_DATA(...)
28  *	_edata = .;
29  *
30  *	EXCEPTION_TABLE(...)
31  *
32  *	BSS_SECTION(0, 0, 0)
33  *	_end = .;
34  *
35  *	STABS_DEBUG
36  *	DWARF_DEBUG
37  *	ELF_DETAILS
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 /*
58  * Only some architectures want to have the .notes segment visible in
59  * a separate PT_NOTE ELF Program Header. When this happens, it needs
60  * to be visible in both the kernel text's PT_LOAD and the PT_NOTE
61  * Program Headers. In this case, though, the PT_LOAD needs to be made
62  * the default again so that all the following sections don't also end
63  * up in the PT_NOTE Program Header.
64  */
65 #ifdef EMITS_PT_NOTE
66 #define NOTES_HEADERS		:text :note
67 #define NOTES_HEADERS_RESTORE	__restore_ph : { *(.__restore_ph) } :text
68 #else
69 #define NOTES_HEADERS
70 #define NOTES_HEADERS_RESTORE
71 #endif
72 
73 /*
74  * Some architectures have non-executable read-only exception tables.
75  * They can be added to the RO_DATA segment by specifying their desired
76  * alignment.
77  */
78 #ifdef RO_EXCEPTION_TABLE_ALIGN
79 #define RO_EXCEPTION_TABLE	EXCEPTION_TABLE(RO_EXCEPTION_TABLE_ALIGN)
80 #else
81 #define RO_EXCEPTION_TABLE
82 #endif
83 
84 /* Align . to a 8 byte boundary equals to maximum function alignment. */
85 #define ALIGN_FUNCTION()  . = ALIGN(8)
86 
87 /*
88  * LD_DEAD_CODE_DATA_ELIMINATION option enables -fdata-sections, which
89  * generates .data.identifier sections, which need to be pulled in with
90  * .data. We don't want to pull in .data..other sections, which Linux
91  * has defined. Same for text and bss.
92  *
93  * With LTO_CLANG, the linker also splits sections by default, so we need
94  * these macros to combine the sections during the final link.
95  *
96  * RODATA_MAIN is not used because existing code already defines .rodata.x
97  * sections to be brought in with rodata.
98  */
99 #if defined(CONFIG_LD_DEAD_CODE_DATA_ELIMINATION) || defined(CONFIG_LTO_CLANG)
100 #define TEXT_MAIN .text .text.[0-9a-zA-Z_]*
101 #define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..L* .data..compoundliteral* .data.$__unnamed_* .data.$L*
102 #define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]*
103 #define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]* .rodata..L*
104 #define BSS_MAIN .bss .bss.[0-9a-zA-Z_]* .bss..compoundliteral*
105 #define SBSS_MAIN .sbss .sbss.[0-9a-zA-Z_]*
106 #else
107 #define TEXT_MAIN .text
108 #define DATA_MAIN .data
109 #define SDATA_MAIN .sdata
110 #define RODATA_MAIN .rodata
111 #define BSS_MAIN .bss
112 #define SBSS_MAIN .sbss
113 #endif
114 
115 /*
116  * GCC 4.5 and later have a 32 bytes section alignment for structures.
117  * Except GCC 4.9, that feels the need to align on 64 bytes.
118  */
119 #if __GNUC__ == 4 && __GNUC_MINOR__ == 9
120 #define STRUCT_ALIGNMENT 64
121 #else
122 #define STRUCT_ALIGNMENT 32
123 #endif
124 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
125 
126 /*
127  * The order of the sched class addresses are important, as they are
128  * used to determine the order of the priority of each sched class in
129  * relation to each other.
130  */
131 #define SCHED_DATA				\
132 	STRUCT_ALIGN();				\
133 	__begin_sched_classes = .;		\
134 	*(__idle_sched_class)			\
135 	*(__fair_sched_class)			\
136 	*(__rt_sched_class)			\
137 	*(__dl_sched_class)			\
138 	*(__stop_sched_class)			\
139 	__end_sched_classes = .;
140 
141 /* The actual configuration determine if the init/exit sections
142  * are handled as text/data or they can be discarded (which
143  * often happens at runtime)
144  */
145 #ifdef CONFIG_HOTPLUG_CPU
146 #define CPU_KEEP(sec)    *(.cpu##sec)
147 #define CPU_DISCARD(sec)
148 #else
149 #define CPU_KEEP(sec)
150 #define CPU_DISCARD(sec) *(.cpu##sec)
151 #endif
152 
153 #if defined(CONFIG_MEMORY_HOTPLUG)
154 #define MEM_KEEP(sec)    *(.mem##sec)
155 #define MEM_DISCARD(sec)
156 #else
157 #define MEM_KEEP(sec)
158 #define MEM_DISCARD(sec) *(.mem##sec)
159 #endif
160 
161 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
162 /*
163  * The ftrace call sites are logged to a section whose name depends on the
164  * compiler option used. A given kernel image will only use one, AKA
165  * FTRACE_CALLSITE_SECTION. We capture all of them here to avoid header
166  * dependencies for FTRACE_CALLSITE_SECTION's definition.
167  *
168  * Need to also make ftrace_stub_graph point to ftrace_stub
169  * so that the same stub location may have different protocols
170  * and not mess up with C verifiers.
171  */
172 #define MCOUNT_REC()	. = ALIGN(8);				\
173 			__start_mcount_loc = .;			\
174 			KEEP(*(__mcount_loc))			\
175 			KEEP(*(__patchable_function_entries))	\
176 			__stop_mcount_loc = .;			\
177 			ftrace_stub_graph = ftrace_stub;
178 #else
179 # ifdef CONFIG_FUNCTION_TRACER
180 #  define MCOUNT_REC()	ftrace_stub_graph = ftrace_stub;
181 # else
182 #  define MCOUNT_REC()
183 # endif
184 #endif
185 
186 #ifdef CONFIG_TRACE_BRANCH_PROFILING
187 #define LIKELY_PROFILE()	__start_annotated_branch_profile = .;	\
188 				KEEP(*(_ftrace_annotated_branch))	\
189 				__stop_annotated_branch_profile = .;
190 #else
191 #define LIKELY_PROFILE()
192 #endif
193 
194 #ifdef CONFIG_PROFILE_ALL_BRANCHES
195 #define BRANCH_PROFILE()	__start_branch_profile = .;		\
196 				KEEP(*(_ftrace_branch))			\
197 				__stop_branch_profile = .;
198 #else
199 #define BRANCH_PROFILE()
200 #endif
201 
202 #ifdef CONFIG_KPROBES
203 #define KPROBE_BLACKLIST()	. = ALIGN(8);				      \
204 				__start_kprobe_blacklist = .;		      \
205 				KEEP(*(_kprobe_blacklist))		      \
206 				__stop_kprobe_blacklist = .;
207 #else
208 #define KPROBE_BLACKLIST()
209 #endif
210 
211 #ifdef CONFIG_FUNCTION_ERROR_INJECTION
212 #define ERROR_INJECT_WHITELIST()	STRUCT_ALIGN();			      \
213 			__start_error_injection_whitelist = .;		      \
214 			KEEP(*(_error_injection_whitelist))		      \
215 			__stop_error_injection_whitelist = .;
216 #else
217 #define ERROR_INJECT_WHITELIST()
218 #endif
219 
220 #ifdef CONFIG_EVENT_TRACING
221 #define FTRACE_EVENTS()	. = ALIGN(8);					\
222 			__start_ftrace_events = .;			\
223 			KEEP(*(_ftrace_events))				\
224 			__stop_ftrace_events = .;			\
225 			__start_ftrace_eval_maps = .;			\
226 			KEEP(*(_ftrace_eval_map))			\
227 			__stop_ftrace_eval_maps = .;
228 #else
229 #define FTRACE_EVENTS()
230 #endif
231 
232 #ifdef CONFIG_TRACING
233 #define TRACE_PRINTKS()	 __start___trace_bprintk_fmt = .;      \
234 			 KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \
235 			 __stop___trace_bprintk_fmt = .;
236 #define TRACEPOINT_STR() __start___tracepoint_str = .;	\
237 			 KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \
238 			 __stop___tracepoint_str = .;
239 #else
240 #define TRACE_PRINTKS()
241 #define TRACEPOINT_STR()
242 #endif
243 
244 #ifdef CONFIG_FTRACE_SYSCALLS
245 #define TRACE_SYSCALLS() . = ALIGN(8);					\
246 			 __start_syscalls_metadata = .;			\
247 			 KEEP(*(__syscalls_metadata))			\
248 			 __stop_syscalls_metadata = .;
249 #else
250 #define TRACE_SYSCALLS()
251 #endif
252 
253 #ifdef CONFIG_BPF_EVENTS
254 #define BPF_RAW_TP() STRUCT_ALIGN();					\
255 			 __start__bpf_raw_tp = .;			\
256 			 KEEP(*(__bpf_raw_tp_map))			\
257 			 __stop__bpf_raw_tp = .;
258 #else
259 #define BPF_RAW_TP()
260 #endif
261 
262 #ifdef CONFIG_SERIAL_EARLYCON
263 #define EARLYCON_TABLE() . = ALIGN(8);				\
264 			 __earlycon_table = .;			\
265 			 KEEP(*(__earlycon_table))		\
266 			 __earlycon_table_end = .;
267 #else
268 #define EARLYCON_TABLE()
269 #endif
270 
271 #ifdef CONFIG_SECURITY
272 #define LSM_TABLE()	. = ALIGN(8);					\
273 			__start_lsm_info = .;				\
274 			KEEP(*(.lsm_info.init))				\
275 			__end_lsm_info = .;
276 #define EARLY_LSM_TABLE()	. = ALIGN(8);				\
277 			__start_early_lsm_info = .;			\
278 			KEEP(*(.early_lsm_info.init))			\
279 			__end_early_lsm_info = .;
280 #else
281 #define LSM_TABLE()
282 #define EARLY_LSM_TABLE()
283 #endif
284 
285 #define ___OF_TABLE(cfg, name)	_OF_TABLE_##cfg(name)
286 #define __OF_TABLE(cfg, name)	___OF_TABLE(cfg, name)
287 #define OF_TABLE(cfg, name)	__OF_TABLE(IS_ENABLED(cfg), name)
288 #define _OF_TABLE_0(name)
289 #define _OF_TABLE_1(name)						\
290 	. = ALIGN(8);							\
291 	__##name##_of_table = .;					\
292 	KEEP(*(__##name##_of_table))					\
293 	KEEP(*(__##name##_of_table_end))
294 
295 #define TIMER_OF_TABLES()	OF_TABLE(CONFIG_TIMER_OF, timer)
296 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
297 #define CLK_OF_TABLES()		OF_TABLE(CONFIG_COMMON_CLK, clk)
298 #define RESERVEDMEM_OF_TABLES()	OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
299 #define CPU_METHOD_OF_TABLES()	OF_TABLE(CONFIG_SMP, cpu_method)
300 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method)
301 
302 #ifdef CONFIG_ACPI
303 #define ACPI_PROBE_TABLE(name)						\
304 	. = ALIGN(8);							\
305 	__##name##_acpi_probe_table = .;				\
306 	KEEP(*(__##name##_acpi_probe_table))				\
307 	__##name##_acpi_probe_table_end = .;
308 #else
309 #define ACPI_PROBE_TABLE(name)
310 #endif
311 
312 #ifdef CONFIG_THERMAL
313 #define THERMAL_TABLE(name)						\
314 	. = ALIGN(8);							\
315 	__##name##_thermal_table = .;					\
316 	KEEP(*(__##name##_thermal_table))				\
317 	__##name##_thermal_table_end = .;
318 #else
319 #define THERMAL_TABLE(name)
320 #endif
321 
322 #ifdef CONFIG_DTPM
323 #define DTPM_TABLE()							\
324 	. = ALIGN(8);							\
325 	__dtpm_table = .;						\
326 	KEEP(*(__dtpm_table))						\
327 	__dtpm_table_end = .;
328 #else
329 #define DTPM_TABLE()
330 #endif
331 
332 #define KERNEL_DTB()							\
333 	STRUCT_ALIGN();							\
334 	__dtb_start = .;						\
335 	KEEP(*(.dtb.init.rodata))					\
336 	__dtb_end = .;
337 
338 /*
339  * .data section
340  */
341 #define DATA_DATA							\
342 	*(.xiptext)							\
343 	*(DATA_MAIN)							\
344 	*(.ref.data)							\
345 	*(.data..shared_aligned) /* percpu related */			\
346 	MEM_KEEP(init.data*)						\
347 	MEM_KEEP(exit.data*)						\
348 	*(.data.unlikely)						\
349 	__start_once = .;						\
350 	*(.data.once)							\
351 	__end_once = .;							\
352 	STRUCT_ALIGN();							\
353 	*(__tracepoints)						\
354 	/* implement dynamic printk debug */				\
355 	. = ALIGN(8);							\
356 	__start___dyndbg = .;						\
357 	KEEP(*(__dyndbg))						\
358 	__stop___dyndbg = .;						\
359 	LIKELY_PROFILE()		       				\
360 	BRANCH_PROFILE()						\
361 	TRACE_PRINTKS()							\
362 	BPF_RAW_TP()							\
363 	TRACEPOINT_STR()
364 
365 /*
366  * Data section helpers
367  */
368 #define NOSAVE_DATA							\
369 	. = ALIGN(PAGE_SIZE);						\
370 	__nosave_begin = .;						\
371 	*(.data..nosave)						\
372 	. = ALIGN(PAGE_SIZE);						\
373 	__nosave_end = .;
374 
375 #define PAGE_ALIGNED_DATA(page_align)					\
376 	. = ALIGN(page_align);						\
377 	*(.data..page_aligned)						\
378 	. = ALIGN(page_align);
379 
380 #define READ_MOSTLY_DATA(align)						\
381 	. = ALIGN(align);						\
382 	*(.data..read_mostly)						\
383 	. = ALIGN(align);
384 
385 #define CACHELINE_ALIGNED_DATA(align)					\
386 	. = ALIGN(align);						\
387 	*(.data..cacheline_aligned)
388 
389 #define INIT_TASK_DATA(align)						\
390 	. = ALIGN(align);						\
391 	__start_init_task = .;						\
392 	init_thread_union = .;						\
393 	init_stack = .;							\
394 	KEEP(*(.data..init_task))					\
395 	KEEP(*(.data..init_thread_info))				\
396 	. = __start_init_task + THREAD_SIZE;				\
397 	__end_init_task = .;
398 
399 #define JUMP_TABLE_DATA							\
400 	. = ALIGN(8);							\
401 	__start___jump_table = .;					\
402 	KEEP(*(__jump_table))						\
403 	__stop___jump_table = .;
404 
405 #define STATIC_CALL_DATA						\
406 	. = ALIGN(8);							\
407 	__start_static_call_sites = .;					\
408 	KEEP(*(.static_call_sites))					\
409 	__stop_static_call_sites = .;					\
410 	__start_static_call_tramp_key = .;				\
411 	KEEP(*(.static_call_tramp_key))					\
412 	__stop_static_call_tramp_key = .;
413 
414 /*
415  * Allow architectures to handle ro_after_init data on their
416  * own by defining an empty RO_AFTER_INIT_DATA.
417  */
418 #ifndef RO_AFTER_INIT_DATA
419 #define RO_AFTER_INIT_DATA						\
420 	. = ALIGN(8);							\
421 	__start_ro_after_init = .;					\
422 	*(.data..ro_after_init)						\
423 	JUMP_TABLE_DATA							\
424 	STATIC_CALL_DATA						\
425 	__end_ro_after_init = .;
426 #endif
427 
428 /*
429  * Read only Data
430  */
431 #define RO_DATA(align)							\
432 	. = ALIGN((align));						\
433 	.rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {		\
434 		__start_rodata = .;					\
435 		*(.rodata) *(.rodata.*)					\
436 		SCHED_DATA						\
437 		RO_AFTER_INIT_DATA	/* Read only after init */	\
438 		. = ALIGN(8);						\
439 		__start___tracepoints_ptrs = .;				\
440 		KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \
441 		__stop___tracepoints_ptrs = .;				\
442 		*(__tracepoints_strings)/* Tracepoints: strings */	\
443 	}								\
444 									\
445 	.rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {		\
446 		*(.rodata1)						\
447 	}								\
448 									\
449 	/* PCI quirks */						\
450 	.pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {	\
451 		__start_pci_fixups_early = .;				\
452 		KEEP(*(.pci_fixup_early))				\
453 		__end_pci_fixups_early = .;				\
454 		__start_pci_fixups_header = .;				\
455 		KEEP(*(.pci_fixup_header))				\
456 		__end_pci_fixups_header = .;				\
457 		__start_pci_fixups_final = .;				\
458 		KEEP(*(.pci_fixup_final))				\
459 		__end_pci_fixups_final = .;				\
460 		__start_pci_fixups_enable = .;				\
461 		KEEP(*(.pci_fixup_enable))				\
462 		__end_pci_fixups_enable = .;				\
463 		__start_pci_fixups_resume = .;				\
464 		KEEP(*(.pci_fixup_resume))				\
465 		__end_pci_fixups_resume = .;				\
466 		__start_pci_fixups_resume_early = .;			\
467 		KEEP(*(.pci_fixup_resume_early))			\
468 		__end_pci_fixups_resume_early = .;			\
469 		__start_pci_fixups_suspend = .;				\
470 		KEEP(*(.pci_fixup_suspend))				\
471 		__end_pci_fixups_suspend = .;				\
472 		__start_pci_fixups_suspend_late = .;			\
473 		KEEP(*(.pci_fixup_suspend_late))			\
474 		__end_pci_fixups_suspend_late = .;			\
475 	}								\
476 									\
477 	/* Built-in firmware blobs */					\
478 	.builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) {	\
479 		__start_builtin_fw = .;					\
480 		KEEP(*(.builtin_fw))					\
481 		__end_builtin_fw = .;					\
482 	}								\
483 									\
484 	TRACEDATA							\
485 									\
486 	/* Kernel symbol table: Normal symbols */			\
487 	__ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {		\
488 		__start___ksymtab = .;					\
489 		KEEP(*(SORT(___ksymtab+*)))				\
490 		__stop___ksymtab = .;					\
491 	}								\
492 									\
493 	/* Kernel symbol table: GPL-only symbols */			\
494 	__ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {	\
495 		__start___ksymtab_gpl = .;				\
496 		KEEP(*(SORT(___ksymtab_gpl+*)))				\
497 		__stop___ksymtab_gpl = .;				\
498 	}								\
499 									\
500 	/* Kernel symbol table: Normal symbols */			\
501 	__kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {		\
502 		__start___kcrctab = .;					\
503 		KEEP(*(SORT(___kcrctab+*)))				\
504 		__stop___kcrctab = .;					\
505 	}								\
506 									\
507 	/* Kernel symbol table: GPL-only symbols */			\
508 	__kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {	\
509 		__start___kcrctab_gpl = .;				\
510 		KEEP(*(SORT(___kcrctab_gpl+*)))				\
511 		__stop___kcrctab_gpl = .;				\
512 	}								\
513 									\
514 	/* Kernel symbol table: strings */				\
515         __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) {	\
516 		*(__ksymtab_strings)					\
517 	}								\
518 									\
519 	/* __*init sections */						\
520 	__init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {		\
521 		*(.ref.rodata)						\
522 		MEM_KEEP(init.rodata)					\
523 		MEM_KEEP(exit.rodata)					\
524 	}								\
525 									\
526 	/* Built-in module parameters. */				\
527 	__param : AT(ADDR(__param) - LOAD_OFFSET) {			\
528 		__start___param = .;					\
529 		KEEP(*(__param))					\
530 		__stop___param = .;					\
531 	}								\
532 									\
533 	/* Built-in module versions. */					\
534 	__modver : AT(ADDR(__modver) - LOAD_OFFSET) {			\
535 		__start___modver = .;					\
536 		KEEP(*(__modver))					\
537 		__stop___modver = .;					\
538 	}								\
539 									\
540 	RO_EXCEPTION_TABLE						\
541 	NOTES								\
542 	BTF								\
543 									\
544 	. = ALIGN((align));						\
545 	__end_rodata = .;
546 
547 
548 /*
549  * .text..L.cfi.jumptable.* contain Control-Flow Integrity (CFI)
550  * jump table entries.
551  */
552 #ifdef CONFIG_CFI_CLANG
553 #define TEXT_CFI_JT							\
554 		. = ALIGN(PMD_SIZE);					\
555 		__cfi_jt_start = .;					\
556 		*(.text..L.cfi.jumptable .text..L.cfi.jumptable.*)	\
557 		. = ALIGN(PMD_SIZE);					\
558 		__cfi_jt_end = .;
559 #else
560 #define TEXT_CFI_JT
561 #endif
562 
563 /*
564  * Non-instrumentable text section
565  */
566 #define NOINSTR_TEXT							\
567 		ALIGN_FUNCTION();					\
568 		__noinstr_text_start = .;				\
569 		*(.noinstr.text)					\
570 		__noinstr_text_end = .;
571 
572 /*
573  * .text section. Map to function alignment to avoid address changes
574  * during second ld run in second ld pass when generating System.map
575  *
576  * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead
577  * code elimination is enabled, so these sections should be converted
578  * to use ".." first.
579  */
580 #define TEXT_TEXT							\
581 		ALIGN_FUNCTION();					\
582 		*(.text.hot .text.hot.*)				\
583 		*(TEXT_MAIN .text.fixup)				\
584 		*(.text.unlikely .text.unlikely.*)			\
585 		*(.text.unknown .text.unknown.*)			\
586 		NOINSTR_TEXT						\
587 		*(.text..refcount)					\
588 		*(.ref.text)						\
589 		TEXT_CFI_JT						\
590 	MEM_KEEP(init.text*)						\
591 	MEM_KEEP(exit.text*)						\
592 
593 
594 /* sched.text is aling to function alignment to secure we have same
595  * address even at second ld pass when generating System.map */
596 #define SCHED_TEXT							\
597 		ALIGN_FUNCTION();					\
598 		__sched_text_start = .;					\
599 		*(.sched.text)						\
600 		__sched_text_end = .;
601 
602 /* spinlock.text is aling to function alignment to secure we have same
603  * address even at second ld pass when generating System.map */
604 #define LOCK_TEXT							\
605 		ALIGN_FUNCTION();					\
606 		__lock_text_start = .;					\
607 		*(.spinlock.text)					\
608 		__lock_text_end = .;
609 
610 #define CPUIDLE_TEXT							\
611 		ALIGN_FUNCTION();					\
612 		__cpuidle_text_start = .;				\
613 		*(.cpuidle.text)					\
614 		__cpuidle_text_end = .;
615 
616 #define KPROBES_TEXT							\
617 		ALIGN_FUNCTION();					\
618 		__kprobes_text_start = .;				\
619 		*(.kprobes.text)					\
620 		__kprobes_text_end = .;
621 
622 #define ENTRY_TEXT							\
623 		ALIGN_FUNCTION();					\
624 		__entry_text_start = .;					\
625 		*(.entry.text)						\
626 		__entry_text_end = .;
627 
628 #define IRQENTRY_TEXT							\
629 		ALIGN_FUNCTION();					\
630 		__irqentry_text_start = .;				\
631 		*(.irqentry.text)					\
632 		__irqentry_text_end = .;
633 
634 #define SOFTIRQENTRY_TEXT						\
635 		ALIGN_FUNCTION();					\
636 		__softirqentry_text_start = .;				\
637 		*(.softirqentry.text)					\
638 		__softirqentry_text_end = .;
639 
640 #define STATIC_CALL_TEXT						\
641 		ALIGN_FUNCTION();					\
642 		__static_call_text_start = .;				\
643 		*(.static_call.text)					\
644 		__static_call_text_end = .;
645 
646 /* Section used for early init (in .S files) */
647 #define HEAD_TEXT  KEEP(*(.head.text))
648 
649 #define HEAD_TEXT_SECTION							\
650 	.head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {		\
651 		HEAD_TEXT						\
652 	}
653 
654 /*
655  * Exception table
656  */
657 #define EXCEPTION_TABLE(align)						\
658 	. = ALIGN(align);						\
659 	__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {		\
660 		__start___ex_table = .;					\
661 		KEEP(*(__ex_table))					\
662 		__stop___ex_table = .;					\
663 	}
664 
665 /*
666  * .BTF
667  */
668 #ifdef CONFIG_DEBUG_INFO_BTF
669 #define BTF								\
670 	.BTF : AT(ADDR(.BTF) - LOAD_OFFSET) {				\
671 		__start_BTF = .;					\
672 		KEEP(*(.BTF))						\
673 		__stop_BTF = .;						\
674 	}								\
675 	. = ALIGN(4);							\
676 	.BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) {			\
677 		*(.BTF_ids)						\
678 	}
679 #else
680 #define BTF
681 #endif
682 
683 /*
684  * Init task
685  */
686 #define INIT_TASK_DATA_SECTION(align)					\
687 	. = ALIGN(align);						\
688 	.data..init_task :  AT(ADDR(.data..init_task) - LOAD_OFFSET) {	\
689 		INIT_TASK_DATA(align)					\
690 	}
691 
692 #ifdef CONFIG_CONSTRUCTORS
693 #define KERNEL_CTORS()	. = ALIGN(8);			   \
694 			__ctors_start = .;		   \
695 			KEEP(*(SORT(.ctors.*)))		   \
696 			KEEP(*(.ctors))			   \
697 			KEEP(*(SORT(.init_array.*)))	   \
698 			KEEP(*(.init_array))		   \
699 			__ctors_end = .;
700 #else
701 #define KERNEL_CTORS()
702 #endif
703 
704 /* init and exit section handling */
705 #define INIT_DATA							\
706 	KEEP(*(SORT(___kentry+*)))					\
707 	*(.init.data init.data.*)					\
708 	MEM_DISCARD(init.data*)						\
709 	KERNEL_CTORS()							\
710 	MCOUNT_REC()							\
711 	*(.init.rodata .init.rodata.*)					\
712 	FTRACE_EVENTS()							\
713 	TRACE_SYSCALLS()						\
714 	KPROBE_BLACKLIST()						\
715 	ERROR_INJECT_WHITELIST()					\
716 	MEM_DISCARD(init.rodata)					\
717 	CLK_OF_TABLES()							\
718 	RESERVEDMEM_OF_TABLES()						\
719 	TIMER_OF_TABLES()						\
720 	CPU_METHOD_OF_TABLES()						\
721 	CPUIDLE_METHOD_OF_TABLES()					\
722 	KERNEL_DTB()							\
723 	IRQCHIP_OF_MATCH_TABLE()					\
724 	ACPI_PROBE_TABLE(irqchip)					\
725 	ACPI_PROBE_TABLE(timer)						\
726 	THERMAL_TABLE(governor)						\
727 	DTPM_TABLE()							\
728 	EARLYCON_TABLE()						\
729 	LSM_TABLE()							\
730 	EARLY_LSM_TABLE()						\
731 	KUNIT_TABLE()
732 
733 #define INIT_TEXT							\
734 	*(.init.text .init.text.*)					\
735 	*(.text.startup)						\
736 	MEM_DISCARD(init.text*)
737 
738 #define EXIT_DATA							\
739 	*(.exit.data .exit.data.*)					\
740 	*(.fini_array .fini_array.*)					\
741 	*(.dtors .dtors.*)						\
742 	MEM_DISCARD(exit.data*)						\
743 	MEM_DISCARD(exit.rodata*)
744 
745 #define EXIT_TEXT							\
746 	*(.exit.text)							\
747 	*(.text.exit)							\
748 	MEM_DISCARD(exit.text)
749 
750 #define EXIT_CALL							\
751 	*(.exitcall.exit)
752 
753 /*
754  * bss (Block Started by Symbol) - uninitialized data
755  * zeroed during startup
756  */
757 #define SBSS(sbss_align)						\
758 	. = ALIGN(sbss_align);						\
759 	.sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {				\
760 		*(.dynsbss)						\
761 		*(SBSS_MAIN)						\
762 		*(.scommon)						\
763 	}
764 
765 /*
766  * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
767  * sections to the front of bss.
768  */
769 #ifndef BSS_FIRST_SECTIONS
770 #define BSS_FIRST_SECTIONS
771 #endif
772 
773 #define BSS(bss_align)							\
774 	. = ALIGN(bss_align);						\
775 	.bss : AT(ADDR(.bss) - LOAD_OFFSET) {				\
776 		BSS_FIRST_SECTIONS					\
777 		. = ALIGN(PAGE_SIZE);					\
778 		*(.bss..page_aligned)					\
779 		. = ALIGN(PAGE_SIZE);					\
780 		*(.dynbss)						\
781 		*(BSS_MAIN)						\
782 		*(COMMON)						\
783 	}
784 
785 /*
786  * DWARF debug sections.
787  * Symbols in the DWARF debugging sections are relative to
788  * the beginning of the section so we begin them at 0.
789  */
790 #define DWARF_DEBUG							\
791 		/* DWARF 1 */						\
792 		.debug          0 : { *(.debug) }			\
793 		.line           0 : { *(.line) }			\
794 		/* GNU DWARF 1 extensions */				\
795 		.debug_srcinfo  0 : { *(.debug_srcinfo) }		\
796 		.debug_sfnames  0 : { *(.debug_sfnames) }		\
797 		/* DWARF 1.1 and DWARF 2 */				\
798 		.debug_aranges  0 : { *(.debug_aranges) }		\
799 		.debug_pubnames 0 : { *(.debug_pubnames) }		\
800 		/* DWARF 2 */						\
801 		.debug_info     0 : { *(.debug_info			\
802 				.gnu.linkonce.wi.*) }			\
803 		.debug_abbrev   0 : { *(.debug_abbrev) }		\
804 		.debug_line     0 : { *(.debug_line) }			\
805 		.debug_frame    0 : { *(.debug_frame) }			\
806 		.debug_str      0 : { *(.debug_str) }			\
807 		.debug_loc      0 : { *(.debug_loc) }			\
808 		.debug_macinfo  0 : { *(.debug_macinfo) }		\
809 		.debug_pubtypes 0 : { *(.debug_pubtypes) }		\
810 		/* DWARF 3 */						\
811 		.debug_ranges	0 : { *(.debug_ranges) }		\
812 		/* SGI/MIPS DWARF 2 extensions */			\
813 		.debug_weaknames 0 : { *(.debug_weaknames) }		\
814 		.debug_funcnames 0 : { *(.debug_funcnames) }		\
815 		.debug_typenames 0 : { *(.debug_typenames) }		\
816 		.debug_varnames  0 : { *(.debug_varnames) }		\
817 		/* GNU DWARF 2 extensions */				\
818 		.debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) }	\
819 		.debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) }	\
820 		/* DWARF 4 */						\
821 		.debug_types	0 : { *(.debug_types) }			\
822 		/* DWARF 5 */						\
823 		.debug_addr	0 : { *(.debug_addr) }			\
824 		.debug_line_str	0 : { *(.debug_line_str) }		\
825 		.debug_loclists	0 : { *(.debug_loclists) }		\
826 		.debug_macro	0 : { *(.debug_macro) }			\
827 		.debug_names	0 : { *(.debug_names) }			\
828 		.debug_rnglists	0 : { *(.debug_rnglists) }		\
829 		.debug_str_offsets	0 : { *(.debug_str_offsets) }
830 
831 /* Stabs debugging sections. */
832 #define STABS_DEBUG							\
833 		.stab 0 : { *(.stab) }					\
834 		.stabstr 0 : { *(.stabstr) }				\
835 		.stab.excl 0 : { *(.stab.excl) }			\
836 		.stab.exclstr 0 : { *(.stab.exclstr) }			\
837 		.stab.index 0 : { *(.stab.index) }			\
838 		.stab.indexstr 0 : { *(.stab.indexstr) }
839 
840 /* Required sections not related to debugging. */
841 #define ELF_DETAILS							\
842 		.comment 0 : { *(.comment) }				\
843 		.symtab 0 : { *(.symtab) }				\
844 		.strtab 0 : { *(.strtab) }				\
845 		.shstrtab 0 : { *(.shstrtab) }
846 
847 #ifdef CONFIG_GENERIC_BUG
848 #define BUG_TABLE							\
849 	. = ALIGN(8);							\
850 	__bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {		\
851 		__start___bug_table = .;				\
852 		KEEP(*(__bug_table))					\
853 		__stop___bug_table = .;					\
854 	}
855 #else
856 #define BUG_TABLE
857 #endif
858 
859 #ifdef CONFIG_UNWINDER_ORC
860 #define ORC_UNWIND_TABLE						\
861 	. = ALIGN(4);							\
862 	.orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) {	\
863 		__start_orc_unwind_ip = .;				\
864 		KEEP(*(.orc_unwind_ip))					\
865 		__stop_orc_unwind_ip = .;				\
866 	}								\
867 	. = ALIGN(2);							\
868 	.orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) {		\
869 		__start_orc_unwind = .;					\
870 		KEEP(*(.orc_unwind))					\
871 		__stop_orc_unwind = .;					\
872 	}								\
873 	. = ALIGN(4);							\
874 	.orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) {		\
875 		orc_lookup = .;						\
876 		. += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) /	\
877 			LOOKUP_BLOCK_SIZE) + 1) * 4;			\
878 		orc_lookup_end = .;					\
879 	}
880 #else
881 #define ORC_UNWIND_TABLE
882 #endif
883 
884 #ifdef CONFIG_PM_TRACE
885 #define TRACEDATA							\
886 	. = ALIGN(4);							\
887 	.tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {		\
888 		__tracedata_start = .;					\
889 		KEEP(*(.tracedata))					\
890 		__tracedata_end = .;					\
891 	}
892 #else
893 #define TRACEDATA
894 #endif
895 
896 #define NOTES								\
897 	.notes : AT(ADDR(.notes) - LOAD_OFFSET) {			\
898 		__start_notes = .;					\
899 		KEEP(*(.note.*))					\
900 		__stop_notes = .;					\
901 	} NOTES_HEADERS							\
902 	NOTES_HEADERS_RESTORE
903 
904 #define INIT_SETUP(initsetup_align)					\
905 		. = ALIGN(initsetup_align);				\
906 		__setup_start = .;					\
907 		KEEP(*(.init.setup))					\
908 		__setup_end = .;
909 
910 #define INIT_CALLS_LEVEL(level)						\
911 		__initcall##level##_start = .;				\
912 		KEEP(*(.initcall##level##.init))			\
913 		KEEP(*(.initcall##level##s.init))			\
914 
915 #define INIT_CALLS							\
916 		__initcall_start = .;					\
917 		KEEP(*(.initcallearly.init))				\
918 		INIT_CALLS_LEVEL(0)					\
919 		INIT_CALLS_LEVEL(1)					\
920 		INIT_CALLS_LEVEL(2)					\
921 		INIT_CALLS_LEVEL(3)					\
922 		INIT_CALLS_LEVEL(4)					\
923 		INIT_CALLS_LEVEL(5)					\
924 		INIT_CALLS_LEVEL(rootfs)				\
925 		INIT_CALLS_LEVEL(6)					\
926 		INIT_CALLS_LEVEL(7)					\
927 		__initcall_end = .;
928 
929 #define CON_INITCALL							\
930 		__con_initcall_start = .;				\
931 		KEEP(*(.con_initcall.init))				\
932 		__con_initcall_end = .;
933 
934 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */
935 #define KUNIT_TABLE()							\
936 		. = ALIGN(8);						\
937 		__kunit_suites_start = .;				\
938 		KEEP(*(.kunit_test_suites))				\
939 		__kunit_suites_end = .;
940 
941 #ifdef CONFIG_BLK_DEV_INITRD
942 #define INIT_RAM_FS							\
943 	. = ALIGN(4);							\
944 	__initramfs_start = .;						\
945 	KEEP(*(.init.ramfs))						\
946 	. = ALIGN(8);							\
947 	KEEP(*(.init.ramfs.info))
948 #else
949 #define INIT_RAM_FS
950 #endif
951 
952 /*
953  * Memory encryption operates on a page basis. Since we need to clear
954  * the memory encryption mask for this section, it needs to be aligned
955  * on a page boundary and be a page-size multiple in length.
956  *
957  * Note: We use a separate section so that only this section gets
958  * decrypted to avoid exposing more than we wish.
959  */
960 #ifdef CONFIG_AMD_MEM_ENCRYPT
961 #define PERCPU_DECRYPTED_SECTION					\
962 	. = ALIGN(PAGE_SIZE);						\
963 	*(.data..percpu..decrypted)					\
964 	. = ALIGN(PAGE_SIZE);
965 #else
966 #define PERCPU_DECRYPTED_SECTION
967 #endif
968 
969 
970 /*
971  * Default discarded sections.
972  *
973  * Some archs want to discard exit text/data at runtime rather than
974  * link time due to cross-section references such as alt instructions,
975  * bug table, eh_frame, etc.  DISCARDS must be the last of output
976  * section definitions so that such archs put those in earlier section
977  * definitions.
978  */
979 #ifdef RUNTIME_DISCARD_EXIT
980 #define EXIT_DISCARDS
981 #else
982 #define EXIT_DISCARDS							\
983 	EXIT_TEXT							\
984 	EXIT_DATA
985 #endif
986 
987 /*
988  * Clang's -fprofile-arcs, -fsanitize=kernel-address, and
989  * -fsanitize=thread produce unwanted sections (.eh_frame
990  * and .init_array.*), but CONFIG_CONSTRUCTORS wants to
991  * keep any .init_array.* sections.
992  * https://bugs.llvm.org/show_bug.cgi?id=46478
993  */
994 #if defined(CONFIG_GCOV_KERNEL) || defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN) || \
995 	defined(CONFIG_CFI_CLANG)
996 # ifdef CONFIG_CONSTRUCTORS
997 #  define SANITIZER_DISCARDS						\
998 	*(.eh_frame)
999 # else
1000 #  define SANITIZER_DISCARDS						\
1001 	*(.init_array) *(.init_array.*)					\
1002 	*(.eh_frame)
1003 # endif
1004 #else
1005 # define SANITIZER_DISCARDS
1006 #endif
1007 
1008 #define COMMON_DISCARDS							\
1009 	SANITIZER_DISCARDS						\
1010 	*(.discard)							\
1011 	*(.discard.*)							\
1012 	*(.modinfo)							\
1013 	/* ld.bfd warns about .gnu.version* even when not emitted */	\
1014 	*(.gnu.version*)						\
1015 
1016 #define DISCARDS							\
1017 	/DISCARD/ : {							\
1018 	EXIT_DISCARDS							\
1019 	EXIT_CALL							\
1020 	COMMON_DISCARDS							\
1021 	}
1022 
1023 /**
1024  * PERCPU_INPUT - the percpu input sections
1025  * @cacheline: cacheline size
1026  *
1027  * The core percpu section names and core symbols which do not rely
1028  * directly upon load addresses.
1029  *
1030  * @cacheline is used to align subsections to avoid false cacheline
1031  * sharing between subsections for different purposes.
1032  */
1033 #define PERCPU_INPUT(cacheline)						\
1034 	__per_cpu_start = .;						\
1035 	*(.data..percpu..first)						\
1036 	. = ALIGN(PAGE_SIZE);						\
1037 	*(.data..percpu..page_aligned)					\
1038 	. = ALIGN(cacheline);						\
1039 	*(.data..percpu..read_mostly)					\
1040 	. = ALIGN(cacheline);						\
1041 	*(.data..percpu)						\
1042 	*(.data..percpu..shared_aligned)				\
1043 	PERCPU_DECRYPTED_SECTION					\
1044 	__per_cpu_end = .;
1045 
1046 /**
1047  * PERCPU_VADDR - define output section for percpu area
1048  * @cacheline: cacheline size
1049  * @vaddr: explicit base address (optional)
1050  * @phdr: destination PHDR (optional)
1051  *
1052  * Macro which expands to output section for percpu area.
1053  *
1054  * @cacheline is used to align subsections to avoid false cacheline
1055  * sharing between subsections for different purposes.
1056  *
1057  * If @vaddr is not blank, it specifies explicit base address and all
1058  * percpu symbols will be offset from the given address.  If blank,
1059  * @vaddr always equals @laddr + LOAD_OFFSET.
1060  *
1061  * @phdr defines the output PHDR to use if not blank.  Be warned that
1062  * output PHDR is sticky.  If @phdr is specified, the next output
1063  * section in the linker script will go there too.  @phdr should have
1064  * a leading colon.
1065  *
1066  * Note that this macros defines __per_cpu_load as an absolute symbol.
1067  * If there is no need to put the percpu section at a predetermined
1068  * address, use PERCPU_SECTION.
1069  */
1070 #define PERCPU_VADDR(cacheline, vaddr, phdr)				\
1071 	__per_cpu_load = .;						\
1072 	.data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) {	\
1073 		PERCPU_INPUT(cacheline)					\
1074 	} phdr								\
1075 	. = __per_cpu_load + SIZEOF(.data..percpu);
1076 
1077 /**
1078  * PERCPU_SECTION - define output section for percpu area, simple version
1079  * @cacheline: cacheline size
1080  *
1081  * Align to PAGE_SIZE and outputs output section for percpu area.  This
1082  * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
1083  * __per_cpu_start will be identical.
1084  *
1085  * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
1086  * except that __per_cpu_load is defined as a relative symbol against
1087  * .data..percpu which is required for relocatable x86_32 configuration.
1088  */
1089 #define PERCPU_SECTION(cacheline)					\
1090 	. = ALIGN(PAGE_SIZE);						\
1091 	.data..percpu	: AT(ADDR(.data..percpu) - LOAD_OFFSET) {	\
1092 		__per_cpu_load = .;					\
1093 		PERCPU_INPUT(cacheline)					\
1094 	}
1095 
1096 
1097 /*
1098  * Definition of the high level *_SECTION macros
1099  * They will fit only a subset of the architectures
1100  */
1101 
1102 
1103 /*
1104  * Writeable data.
1105  * All sections are combined in a single .data section.
1106  * The sections following CONSTRUCTORS are arranged so their
1107  * typical alignment matches.
1108  * A cacheline is typical/always less than a PAGE_SIZE so
1109  * the sections that has this restriction (or similar)
1110  * is located before the ones requiring PAGE_SIZE alignment.
1111  * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
1112  * matches the requirement of PAGE_ALIGNED_DATA.
1113  *
1114  * use 0 as page_align if page_aligned data is not used */
1115 #define RW_DATA(cacheline, pagealigned, inittask)			\
1116 	. = ALIGN(PAGE_SIZE);						\
1117 	.data : AT(ADDR(.data) - LOAD_OFFSET) {				\
1118 		INIT_TASK_DATA(inittask)				\
1119 		NOSAVE_DATA						\
1120 		PAGE_ALIGNED_DATA(pagealigned)				\
1121 		CACHELINE_ALIGNED_DATA(cacheline)			\
1122 		READ_MOSTLY_DATA(cacheline)				\
1123 		DATA_DATA						\
1124 		CONSTRUCTORS						\
1125 	}								\
1126 	BUG_TABLE							\
1127 
1128 #define INIT_TEXT_SECTION(inittext_align)				\
1129 	. = ALIGN(inittext_align);					\
1130 	.init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {		\
1131 		_sinittext = .;						\
1132 		INIT_TEXT						\
1133 		_einittext = .;						\
1134 	}
1135 
1136 #define INIT_DATA_SECTION(initsetup_align)				\
1137 	.init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {		\
1138 		INIT_DATA						\
1139 		INIT_SETUP(initsetup_align)				\
1140 		INIT_CALLS						\
1141 		CON_INITCALL						\
1142 		INIT_RAM_FS						\
1143 	}
1144 
1145 #define BSS_SECTION(sbss_align, bss_align, stop_align)			\
1146 	. = ALIGN(sbss_align);						\
1147 	__bss_start = .;						\
1148 	SBSS(sbss_align)						\
1149 	BSS(bss_align)							\
1150 	. = ALIGN(stop_align);						\
1151 	__bss_stop = .;
1152