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 #define STRUCT_ALIGNMENT 32
120 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
121 
122 /*
123  * The order of the sched class addresses are important, as they are
124  * used to determine the order of the priority of each sched class in
125  * relation to each other.
126  */
127 #define SCHED_DATA				\
128 	STRUCT_ALIGN();				\
129 	__begin_sched_classes = .;		\
130 	*(__idle_sched_class)			\
131 	*(__fair_sched_class)			\
132 	*(__rt_sched_class)			\
133 	*(__dl_sched_class)			\
134 	*(__stop_sched_class)			\
135 	__end_sched_classes = .;
136 
137 /* The actual configuration determine if the init/exit sections
138  * are handled as text/data or they can be discarded (which
139  * often happens at runtime)
140  */
141 #ifdef CONFIG_HOTPLUG_CPU
142 #define CPU_KEEP(sec)    *(.cpu##sec)
143 #define CPU_DISCARD(sec)
144 #else
145 #define CPU_KEEP(sec)
146 #define CPU_DISCARD(sec) *(.cpu##sec)
147 #endif
148 
149 #if defined(CONFIG_MEMORY_HOTPLUG)
150 #define MEM_KEEP(sec)    *(.mem##sec)
151 #define MEM_DISCARD(sec)
152 #else
153 #define MEM_KEEP(sec)
154 #define MEM_DISCARD(sec) *(.mem##sec)
155 #endif
156 
157 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
158 /*
159  * The ftrace call sites are logged to a section whose name depends on the
160  * compiler option used. A given kernel image will only use one, AKA
161  * FTRACE_CALLSITE_SECTION. We capture all of them here to avoid header
162  * dependencies for FTRACE_CALLSITE_SECTION's definition.
163  *
164  * Need to also make ftrace_stub_graph point to ftrace_stub
165  * so that the same stub location may have different protocols
166  * and not mess up with C verifiers.
167  *
168  * ftrace_ops_list_func will be defined as arch_ftrace_ops_list_func
169  * as some archs will have a different prototype for that function
170  * but ftrace_ops_list_func() will have a single prototype.
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 			ftrace_ops_list_func = arch_ftrace_ops_list_func;
179 #else
180 # ifdef CONFIG_FUNCTION_TRACER
181 #  define MCOUNT_REC()	ftrace_stub_graph = ftrace_stub;	\
182 			ftrace_ops_list_func = arch_ftrace_ops_list_func;
183 # else
184 #  define MCOUNT_REC()
185 # endif
186 #endif
187 
188 #ifdef CONFIG_TRACE_BRANCH_PROFILING
189 #define LIKELY_PROFILE()	__start_annotated_branch_profile = .;	\
190 				KEEP(*(_ftrace_annotated_branch))	\
191 				__stop_annotated_branch_profile = .;
192 #else
193 #define LIKELY_PROFILE()
194 #endif
195 
196 #ifdef CONFIG_PROFILE_ALL_BRANCHES
197 #define BRANCH_PROFILE()	__start_branch_profile = .;		\
198 				KEEP(*(_ftrace_branch))			\
199 				__stop_branch_profile = .;
200 #else
201 #define BRANCH_PROFILE()
202 #endif
203 
204 #ifdef CONFIG_KPROBES
205 #define KPROBE_BLACKLIST()	. = ALIGN(8);				      \
206 				__start_kprobe_blacklist = .;		      \
207 				KEEP(*(_kprobe_blacklist))		      \
208 				__stop_kprobe_blacklist = .;
209 #else
210 #define KPROBE_BLACKLIST()
211 #endif
212 
213 #ifdef CONFIG_FUNCTION_ERROR_INJECTION
214 #define ERROR_INJECT_WHITELIST()	STRUCT_ALIGN();			      \
215 			__start_error_injection_whitelist = .;		      \
216 			KEEP(*(_error_injection_whitelist))		      \
217 			__stop_error_injection_whitelist = .;
218 #else
219 #define ERROR_INJECT_WHITELIST()
220 #endif
221 
222 #ifdef CONFIG_EVENT_TRACING
223 #define FTRACE_EVENTS()	. = ALIGN(8);					\
224 			__start_ftrace_events = .;			\
225 			KEEP(*(_ftrace_events))				\
226 			__stop_ftrace_events = .;			\
227 			__start_ftrace_eval_maps = .;			\
228 			KEEP(*(_ftrace_eval_map))			\
229 			__stop_ftrace_eval_maps = .;
230 #else
231 #define FTRACE_EVENTS()
232 #endif
233 
234 #ifdef CONFIG_TRACING
235 #define TRACE_PRINTKS()	 __start___trace_bprintk_fmt = .;      \
236 			 KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \
237 			 __stop___trace_bprintk_fmt = .;
238 #define TRACEPOINT_STR() __start___tracepoint_str = .;	\
239 			 KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \
240 			 __stop___tracepoint_str = .;
241 #else
242 #define TRACE_PRINTKS()
243 #define TRACEPOINT_STR()
244 #endif
245 
246 #ifdef CONFIG_FTRACE_SYSCALLS
247 #define TRACE_SYSCALLS() . = ALIGN(8);					\
248 			 __start_syscalls_metadata = .;			\
249 			 KEEP(*(__syscalls_metadata))			\
250 			 __stop_syscalls_metadata = .;
251 #else
252 #define TRACE_SYSCALLS()
253 #endif
254 
255 #ifdef CONFIG_BPF_EVENTS
256 #define BPF_RAW_TP() STRUCT_ALIGN();					\
257 			 __start__bpf_raw_tp = .;			\
258 			 KEEP(*(__bpf_raw_tp_map))			\
259 			 __stop__bpf_raw_tp = .;
260 #else
261 #define BPF_RAW_TP()
262 #endif
263 
264 #ifdef CONFIG_SERIAL_EARLYCON
265 #define EARLYCON_TABLE() . = ALIGN(8);				\
266 			 __earlycon_table = .;			\
267 			 KEEP(*(__earlycon_table))		\
268 			 __earlycon_table_end = .;
269 #else
270 #define EARLYCON_TABLE()
271 #endif
272 
273 #ifdef CONFIG_SECURITY
274 #define LSM_TABLE()	. = ALIGN(8);					\
275 			__start_lsm_info = .;				\
276 			KEEP(*(.lsm_info.init))				\
277 			__end_lsm_info = .;
278 #define EARLY_LSM_TABLE()	. = ALIGN(8);				\
279 			__start_early_lsm_info = .;			\
280 			KEEP(*(.early_lsm_info.init))			\
281 			__end_early_lsm_info = .;
282 #else
283 #define LSM_TABLE()
284 #define EARLY_LSM_TABLE()
285 #endif
286 
287 #define ___OF_TABLE(cfg, name)	_OF_TABLE_##cfg(name)
288 #define __OF_TABLE(cfg, name)	___OF_TABLE(cfg, name)
289 #define OF_TABLE(cfg, name)	__OF_TABLE(IS_ENABLED(cfg), name)
290 #define _OF_TABLE_0(name)
291 #define _OF_TABLE_1(name)						\
292 	. = ALIGN(8);							\
293 	__##name##_of_table = .;					\
294 	KEEP(*(__##name##_of_table))					\
295 	KEEP(*(__##name##_of_table_end))
296 
297 #define TIMER_OF_TABLES()	OF_TABLE(CONFIG_TIMER_OF, timer)
298 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
299 #define CLK_OF_TABLES()		OF_TABLE(CONFIG_COMMON_CLK, clk)
300 #define RESERVEDMEM_OF_TABLES()	OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
301 #define CPU_METHOD_OF_TABLES()	OF_TABLE(CONFIG_SMP, cpu_method)
302 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method)
303 
304 #ifdef CONFIG_ACPI
305 #define ACPI_PROBE_TABLE(name)						\
306 	. = ALIGN(8);							\
307 	__##name##_acpi_probe_table = .;				\
308 	KEEP(*(__##name##_acpi_probe_table))				\
309 	__##name##_acpi_probe_table_end = .;
310 #else
311 #define ACPI_PROBE_TABLE(name)
312 #endif
313 
314 #ifdef CONFIG_THERMAL
315 #define THERMAL_TABLE(name)						\
316 	. = ALIGN(8);							\
317 	__##name##_thermal_table = .;					\
318 	KEEP(*(__##name##_thermal_table))				\
319 	__##name##_thermal_table_end = .;
320 #else
321 #define THERMAL_TABLE(name)
322 #endif
323 
324 #define KERNEL_DTB()							\
325 	STRUCT_ALIGN();							\
326 	__dtb_start = .;						\
327 	KEEP(*(.dtb.init.rodata))					\
328 	__dtb_end = .;
329 
330 /*
331  * .data section
332  */
333 #define DATA_DATA							\
334 	*(.xiptext)							\
335 	*(DATA_MAIN)							\
336 	*(.ref.data)							\
337 	*(.data..shared_aligned) /* percpu related */			\
338 	MEM_KEEP(init.data*)						\
339 	MEM_KEEP(exit.data*)						\
340 	*(.data.unlikely)						\
341 	__start_once = .;						\
342 	*(.data.once)							\
343 	__end_once = .;							\
344 	STRUCT_ALIGN();							\
345 	*(__tracepoints)						\
346 	/* implement dynamic printk debug */				\
347 	. = ALIGN(8);							\
348 	__start___dyndbg = .;						\
349 	KEEP(*(__dyndbg))						\
350 	__stop___dyndbg = .;						\
351 	LIKELY_PROFILE()		       				\
352 	BRANCH_PROFILE()						\
353 	TRACE_PRINTKS()							\
354 	BPF_RAW_TP()							\
355 	TRACEPOINT_STR()
356 
357 /*
358  * Data section helpers
359  */
360 #define NOSAVE_DATA							\
361 	. = ALIGN(PAGE_SIZE);						\
362 	__nosave_begin = .;						\
363 	*(.data..nosave)						\
364 	. = ALIGN(PAGE_SIZE);						\
365 	__nosave_end = .;
366 
367 #define PAGE_ALIGNED_DATA(page_align)					\
368 	. = ALIGN(page_align);						\
369 	*(.data..page_aligned)						\
370 	. = ALIGN(page_align);
371 
372 #define READ_MOSTLY_DATA(align)						\
373 	. = ALIGN(align);						\
374 	*(.data..read_mostly)						\
375 	. = ALIGN(align);
376 
377 #define CACHELINE_ALIGNED_DATA(align)					\
378 	. = ALIGN(align);						\
379 	*(.data..cacheline_aligned)
380 
381 #define INIT_TASK_DATA(align)						\
382 	. = ALIGN(align);						\
383 	__start_init_task = .;						\
384 	init_thread_union = .;						\
385 	init_stack = .;							\
386 	KEEP(*(.data..init_task))					\
387 	KEEP(*(.data..init_thread_info))				\
388 	. = __start_init_task + THREAD_SIZE;				\
389 	__end_init_task = .;
390 
391 #define JUMP_TABLE_DATA							\
392 	. = ALIGN(8);							\
393 	__start___jump_table = .;					\
394 	KEEP(*(__jump_table))						\
395 	__stop___jump_table = .;
396 
397 #ifdef CONFIG_HAVE_STATIC_CALL_INLINE
398 #define STATIC_CALL_DATA						\
399 	. = ALIGN(8);							\
400 	__start_static_call_sites = .;					\
401 	KEEP(*(.static_call_sites))					\
402 	__stop_static_call_sites = .;					\
403 	__start_static_call_tramp_key = .;				\
404 	KEEP(*(.static_call_tramp_key))					\
405 	__stop_static_call_tramp_key = .;
406 #else
407 #define STATIC_CALL_DATA
408 #endif
409 
410 /*
411  * Allow architectures to handle ro_after_init data on their
412  * own by defining an empty RO_AFTER_INIT_DATA.
413  */
414 #ifndef RO_AFTER_INIT_DATA
415 #define RO_AFTER_INIT_DATA						\
416 	. = ALIGN(8);							\
417 	__start_ro_after_init = .;					\
418 	*(.data..ro_after_init)						\
419 	JUMP_TABLE_DATA							\
420 	STATIC_CALL_DATA						\
421 	__end_ro_after_init = .;
422 #endif
423 
424 /*
425  * Read only Data
426  */
427 #define RO_DATA(align)							\
428 	. = ALIGN((align));						\
429 	.rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {		\
430 		__start_rodata = .;					\
431 		*(.rodata) *(.rodata.*)					\
432 		SCHED_DATA						\
433 		RO_AFTER_INIT_DATA	/* Read only after init */	\
434 		. = ALIGN(8);						\
435 		__start___tracepoints_ptrs = .;				\
436 		KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \
437 		__stop___tracepoints_ptrs = .;				\
438 		*(__tracepoints_strings)/* Tracepoints: strings */	\
439 	}								\
440 									\
441 	.rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {		\
442 		*(.rodata1)						\
443 	}								\
444 									\
445 	/* PCI quirks */						\
446 	.pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {	\
447 		__start_pci_fixups_early = .;				\
448 		KEEP(*(.pci_fixup_early))				\
449 		__end_pci_fixups_early = .;				\
450 		__start_pci_fixups_header = .;				\
451 		KEEP(*(.pci_fixup_header))				\
452 		__end_pci_fixups_header = .;				\
453 		__start_pci_fixups_final = .;				\
454 		KEEP(*(.pci_fixup_final))				\
455 		__end_pci_fixups_final = .;				\
456 		__start_pci_fixups_enable = .;				\
457 		KEEP(*(.pci_fixup_enable))				\
458 		__end_pci_fixups_enable = .;				\
459 		__start_pci_fixups_resume = .;				\
460 		KEEP(*(.pci_fixup_resume))				\
461 		__end_pci_fixups_resume = .;				\
462 		__start_pci_fixups_resume_early = .;			\
463 		KEEP(*(.pci_fixup_resume_early))			\
464 		__end_pci_fixups_resume_early = .;			\
465 		__start_pci_fixups_suspend = .;				\
466 		KEEP(*(.pci_fixup_suspend))				\
467 		__end_pci_fixups_suspend = .;				\
468 		__start_pci_fixups_suspend_late = .;			\
469 		KEEP(*(.pci_fixup_suspend_late))			\
470 		__end_pci_fixups_suspend_late = .;			\
471 	}								\
472 									\
473 	FW_LOADER_BUILT_IN_DATA						\
474 	TRACEDATA							\
475 									\
476 	PRINTK_INDEX							\
477 									\
478 	/* Kernel symbol table: Normal symbols */			\
479 	__ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {		\
480 		__start___ksymtab = .;					\
481 		KEEP(*(SORT(___ksymtab+*)))				\
482 		__stop___ksymtab = .;					\
483 	}								\
484 									\
485 	/* Kernel symbol table: GPL-only symbols */			\
486 	__ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {	\
487 		__start___ksymtab_gpl = .;				\
488 		KEEP(*(SORT(___ksymtab_gpl+*)))				\
489 		__stop___ksymtab_gpl = .;				\
490 	}								\
491 									\
492 	/* Kernel symbol table: Normal symbols */			\
493 	__kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {		\
494 		__start___kcrctab = .;					\
495 		KEEP(*(SORT(___kcrctab+*)))				\
496 		__stop___kcrctab = .;					\
497 	}								\
498 									\
499 	/* Kernel symbol table: GPL-only symbols */			\
500 	__kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {	\
501 		__start___kcrctab_gpl = .;				\
502 		KEEP(*(SORT(___kcrctab_gpl+*)))				\
503 		__stop___kcrctab_gpl = .;				\
504 	}								\
505 									\
506 	/* Kernel symbol table: strings */				\
507         __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) {	\
508 		*(__ksymtab_strings)					\
509 	}								\
510 									\
511 	/* __*init sections */						\
512 	__init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {		\
513 		*(.ref.rodata)						\
514 		MEM_KEEP(init.rodata)					\
515 		MEM_KEEP(exit.rodata)					\
516 	}								\
517 									\
518 	/* Built-in module parameters. */				\
519 	__param : AT(ADDR(__param) - LOAD_OFFSET) {			\
520 		__start___param = .;					\
521 		KEEP(*(__param))					\
522 		__stop___param = .;					\
523 	}								\
524 									\
525 	/* Built-in module versions. */					\
526 	__modver : AT(ADDR(__modver) - LOAD_OFFSET) {			\
527 		__start___modver = .;					\
528 		KEEP(*(__modver))					\
529 		__stop___modver = .;					\
530 	}								\
531 									\
532 	RO_EXCEPTION_TABLE						\
533 	NOTES								\
534 	BTF								\
535 									\
536 	. = ALIGN((align));						\
537 	__end_rodata = .;
538 
539 
540 /*
541  * .text..L.cfi.jumptable.* contain Control-Flow Integrity (CFI)
542  * jump table entries.
543  */
544 #ifdef CONFIG_CFI_CLANG
545 #define TEXT_CFI_JT							\
546 		. = ALIGN(PMD_SIZE);					\
547 		__cfi_jt_start = .;					\
548 		*(.text..L.cfi.jumptable .text..L.cfi.jumptable.*)	\
549 		. = ALIGN(PMD_SIZE);					\
550 		__cfi_jt_end = .;
551 #else
552 #define TEXT_CFI_JT
553 #endif
554 
555 /*
556  * Non-instrumentable text section
557  */
558 #define NOINSTR_TEXT							\
559 		ALIGN_FUNCTION();					\
560 		__noinstr_text_start = .;				\
561 		*(.noinstr.text)					\
562 		__noinstr_text_end = .;
563 
564 /*
565  * .text section. Map to function alignment to avoid address changes
566  * during second ld run in second ld pass when generating System.map
567  *
568  * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead
569  * code elimination is enabled, so these sections should be converted
570  * to use ".." first.
571  */
572 #define TEXT_TEXT							\
573 		ALIGN_FUNCTION();					\
574 		*(.text.hot .text.hot.*)				\
575 		*(TEXT_MAIN .text.fixup)				\
576 		*(.text.unlikely .text.unlikely.*)			\
577 		*(.text.unknown .text.unknown.*)			\
578 		NOINSTR_TEXT						\
579 		*(.text..refcount)					\
580 		*(.ref.text)						\
581 		*(.text.asan.* .text.tsan.*)				\
582 		TEXT_CFI_JT						\
583 	MEM_KEEP(init.text*)						\
584 	MEM_KEEP(exit.text*)						\
585 
586 
587 /* sched.text is aling to function alignment to secure we have same
588  * address even at second ld pass when generating System.map */
589 #define SCHED_TEXT							\
590 		ALIGN_FUNCTION();					\
591 		__sched_text_start = .;					\
592 		*(.sched.text)						\
593 		__sched_text_end = .;
594 
595 /* spinlock.text is aling to function alignment to secure we have same
596  * address even at second ld pass when generating System.map */
597 #define LOCK_TEXT							\
598 		ALIGN_FUNCTION();					\
599 		__lock_text_start = .;					\
600 		*(.spinlock.text)					\
601 		__lock_text_end = .;
602 
603 #define CPUIDLE_TEXT							\
604 		ALIGN_FUNCTION();					\
605 		__cpuidle_text_start = .;				\
606 		*(.cpuidle.text)					\
607 		__cpuidle_text_end = .;
608 
609 #define KPROBES_TEXT							\
610 		ALIGN_FUNCTION();					\
611 		__kprobes_text_start = .;				\
612 		*(.kprobes.text)					\
613 		__kprobes_text_end = .;
614 
615 #define ENTRY_TEXT							\
616 		ALIGN_FUNCTION();					\
617 		__entry_text_start = .;					\
618 		*(.entry.text)						\
619 		__entry_text_end = .;
620 
621 #define IRQENTRY_TEXT							\
622 		ALIGN_FUNCTION();					\
623 		__irqentry_text_start = .;				\
624 		*(.irqentry.text)					\
625 		__irqentry_text_end = .;
626 
627 #define SOFTIRQENTRY_TEXT						\
628 		ALIGN_FUNCTION();					\
629 		__softirqentry_text_start = .;				\
630 		*(.softirqentry.text)					\
631 		__softirqentry_text_end = .;
632 
633 #define STATIC_CALL_TEXT						\
634 		ALIGN_FUNCTION();					\
635 		__static_call_text_start = .;				\
636 		*(.static_call.text)					\
637 		__static_call_text_end = .;
638 
639 /* Section used for early init (in .S files) */
640 #define HEAD_TEXT  KEEP(*(.head.text))
641 
642 #define HEAD_TEXT_SECTION							\
643 	.head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {		\
644 		HEAD_TEXT						\
645 	}
646 
647 /*
648  * Exception table
649  */
650 #define EXCEPTION_TABLE(align)						\
651 	. = ALIGN(align);						\
652 	__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {		\
653 		__start___ex_table = .;					\
654 		KEEP(*(__ex_table))					\
655 		__stop___ex_table = .;					\
656 	}
657 
658 /*
659  * .BTF
660  */
661 #ifdef CONFIG_DEBUG_INFO_BTF
662 #define BTF								\
663 	.BTF : AT(ADDR(.BTF) - LOAD_OFFSET) {				\
664 		__start_BTF = .;					\
665 		KEEP(*(.BTF))						\
666 		__stop_BTF = .;						\
667 	}								\
668 	. = ALIGN(4);							\
669 	.BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) {			\
670 		*(.BTF_ids)						\
671 	}
672 #else
673 #define BTF
674 #endif
675 
676 /*
677  * Init task
678  */
679 #define INIT_TASK_DATA_SECTION(align)					\
680 	. = ALIGN(align);						\
681 	.data..init_task :  AT(ADDR(.data..init_task) - LOAD_OFFSET) {	\
682 		INIT_TASK_DATA(align)					\
683 	}
684 
685 #ifdef CONFIG_CONSTRUCTORS
686 #define KERNEL_CTORS()	. = ALIGN(8);			   \
687 			__ctors_start = .;		   \
688 			KEEP(*(SORT(.ctors.*)))		   \
689 			KEEP(*(.ctors))			   \
690 			KEEP(*(SORT(.init_array.*)))	   \
691 			KEEP(*(.init_array))		   \
692 			__ctors_end = .;
693 #else
694 #define KERNEL_CTORS()
695 #endif
696 
697 /* init and exit section handling */
698 #define INIT_DATA							\
699 	KEEP(*(SORT(___kentry+*)))					\
700 	*(.init.data init.data.*)					\
701 	MEM_DISCARD(init.data*)						\
702 	KERNEL_CTORS()							\
703 	MCOUNT_REC()							\
704 	*(.init.rodata .init.rodata.*)					\
705 	FTRACE_EVENTS()							\
706 	TRACE_SYSCALLS()						\
707 	KPROBE_BLACKLIST()						\
708 	ERROR_INJECT_WHITELIST()					\
709 	MEM_DISCARD(init.rodata)					\
710 	CLK_OF_TABLES()							\
711 	RESERVEDMEM_OF_TABLES()						\
712 	TIMER_OF_TABLES()						\
713 	CPU_METHOD_OF_TABLES()						\
714 	CPUIDLE_METHOD_OF_TABLES()					\
715 	KERNEL_DTB()							\
716 	IRQCHIP_OF_MATCH_TABLE()					\
717 	ACPI_PROBE_TABLE(irqchip)					\
718 	ACPI_PROBE_TABLE(timer)						\
719 	THERMAL_TABLE(governor)						\
720 	EARLYCON_TABLE()						\
721 	LSM_TABLE()							\
722 	EARLY_LSM_TABLE()						\
723 	KUNIT_TABLE()
724 
725 #define INIT_TEXT							\
726 	*(.init.text .init.text.*)					\
727 	*(.text.startup)						\
728 	MEM_DISCARD(init.text*)
729 
730 #define EXIT_DATA							\
731 	*(.exit.data .exit.data.*)					\
732 	*(.fini_array .fini_array.*)					\
733 	*(.dtors .dtors.*)						\
734 	MEM_DISCARD(exit.data*)						\
735 	MEM_DISCARD(exit.rodata*)
736 
737 #define EXIT_TEXT							\
738 	*(.exit.text)							\
739 	*(.text.exit)							\
740 	MEM_DISCARD(exit.text)
741 
742 #define EXIT_CALL							\
743 	*(.exitcall.exit)
744 
745 /*
746  * bss (Block Started by Symbol) - uninitialized data
747  * zeroed during startup
748  */
749 #define SBSS(sbss_align)						\
750 	. = ALIGN(sbss_align);						\
751 	.sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {				\
752 		*(.dynsbss)						\
753 		*(SBSS_MAIN)						\
754 		*(.scommon)						\
755 	}
756 
757 /*
758  * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
759  * sections to the front of bss.
760  */
761 #ifndef BSS_FIRST_SECTIONS
762 #define BSS_FIRST_SECTIONS
763 #endif
764 
765 #define BSS(bss_align)							\
766 	. = ALIGN(bss_align);						\
767 	.bss : AT(ADDR(.bss) - LOAD_OFFSET) {				\
768 		BSS_FIRST_SECTIONS					\
769 		. = ALIGN(PAGE_SIZE);					\
770 		*(.bss..page_aligned)					\
771 		. = ALIGN(PAGE_SIZE);					\
772 		*(.dynbss)						\
773 		*(BSS_MAIN)						\
774 		*(COMMON)						\
775 	}
776 
777 /*
778  * DWARF debug sections.
779  * Symbols in the DWARF debugging sections are relative to
780  * the beginning of the section so we begin them at 0.
781  */
782 #define DWARF_DEBUG							\
783 		/* DWARF 1 */						\
784 		.debug          0 : { *(.debug) }			\
785 		.line           0 : { *(.line) }			\
786 		/* GNU DWARF 1 extensions */				\
787 		.debug_srcinfo  0 : { *(.debug_srcinfo) }		\
788 		.debug_sfnames  0 : { *(.debug_sfnames) }		\
789 		/* DWARF 1.1 and DWARF 2 */				\
790 		.debug_aranges  0 : { *(.debug_aranges) }		\
791 		.debug_pubnames 0 : { *(.debug_pubnames) }		\
792 		/* DWARF 2 */						\
793 		.debug_info     0 : { *(.debug_info			\
794 				.gnu.linkonce.wi.*) }			\
795 		.debug_abbrev   0 : { *(.debug_abbrev) }		\
796 		.debug_line     0 : { *(.debug_line) }			\
797 		.debug_frame    0 : { *(.debug_frame) }			\
798 		.debug_str      0 : { *(.debug_str) }			\
799 		.debug_loc      0 : { *(.debug_loc) }			\
800 		.debug_macinfo  0 : { *(.debug_macinfo) }		\
801 		.debug_pubtypes 0 : { *(.debug_pubtypes) }		\
802 		/* DWARF 3 */						\
803 		.debug_ranges	0 : { *(.debug_ranges) }		\
804 		/* SGI/MIPS DWARF 2 extensions */			\
805 		.debug_weaknames 0 : { *(.debug_weaknames) }		\
806 		.debug_funcnames 0 : { *(.debug_funcnames) }		\
807 		.debug_typenames 0 : { *(.debug_typenames) }		\
808 		.debug_varnames  0 : { *(.debug_varnames) }		\
809 		/* GNU DWARF 2 extensions */				\
810 		.debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) }	\
811 		.debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) }	\
812 		/* DWARF 4 */						\
813 		.debug_types	0 : { *(.debug_types) }			\
814 		/* DWARF 5 */						\
815 		.debug_addr	0 : { *(.debug_addr) }			\
816 		.debug_line_str	0 : { *(.debug_line_str) }		\
817 		.debug_loclists	0 : { *(.debug_loclists) }		\
818 		.debug_macro	0 : { *(.debug_macro) }			\
819 		.debug_names	0 : { *(.debug_names) }			\
820 		.debug_rnglists	0 : { *(.debug_rnglists) }		\
821 		.debug_str_offsets	0 : { *(.debug_str_offsets) }
822 
823 /* Stabs debugging sections. */
824 #define STABS_DEBUG							\
825 		.stab 0 : { *(.stab) }					\
826 		.stabstr 0 : { *(.stabstr) }				\
827 		.stab.excl 0 : { *(.stab.excl) }			\
828 		.stab.exclstr 0 : { *(.stab.exclstr) }			\
829 		.stab.index 0 : { *(.stab.index) }			\
830 		.stab.indexstr 0 : { *(.stab.indexstr) }
831 
832 /* Required sections not related to debugging. */
833 #define ELF_DETAILS							\
834 		.comment 0 : { *(.comment) }				\
835 		.symtab 0 : { *(.symtab) }				\
836 		.strtab 0 : { *(.strtab) }				\
837 		.shstrtab 0 : { *(.shstrtab) }
838 
839 #ifdef CONFIG_GENERIC_BUG
840 #define BUG_TABLE							\
841 	. = ALIGN(8);							\
842 	__bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {		\
843 		__start___bug_table = .;				\
844 		KEEP(*(__bug_table))					\
845 		__stop___bug_table = .;					\
846 	}
847 #else
848 #define BUG_TABLE
849 #endif
850 
851 #ifdef CONFIG_UNWINDER_ORC
852 #define ORC_UNWIND_TABLE						\
853 	. = ALIGN(4);							\
854 	.orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) {	\
855 		__start_orc_unwind_ip = .;				\
856 		KEEP(*(.orc_unwind_ip))					\
857 		__stop_orc_unwind_ip = .;				\
858 	}								\
859 	. = ALIGN(2);							\
860 	.orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) {		\
861 		__start_orc_unwind = .;					\
862 		KEEP(*(.orc_unwind))					\
863 		__stop_orc_unwind = .;					\
864 	}								\
865 	text_size = _etext - _stext;					\
866 	. = ALIGN(4);							\
867 	.orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) {		\
868 		orc_lookup = .;						\
869 		. += (((text_size + LOOKUP_BLOCK_SIZE - 1) /		\
870 			LOOKUP_BLOCK_SIZE) + 1) * 4;			\
871 		orc_lookup_end = .;					\
872 	}
873 #else
874 #define ORC_UNWIND_TABLE
875 #endif
876 
877 /* Built-in firmware blobs */
878 #ifdef CONFIG_FW_LOADER
879 #define FW_LOADER_BUILT_IN_DATA						\
880 	.builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) {	\
881 		__start_builtin_fw = .;					\
882 		KEEP(*(.builtin_fw))					\
883 		__end_builtin_fw = .;					\
884 	}
885 #else
886 #define FW_LOADER_BUILT_IN_DATA
887 #endif
888 
889 #ifdef CONFIG_PM_TRACE
890 #define TRACEDATA							\
891 	. = ALIGN(4);							\
892 	.tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {		\
893 		__tracedata_start = .;					\
894 		KEEP(*(.tracedata))					\
895 		__tracedata_end = .;					\
896 	}
897 #else
898 #define TRACEDATA
899 #endif
900 
901 #ifdef CONFIG_PRINTK_INDEX
902 #define PRINTK_INDEX							\
903 	.printk_index : AT(ADDR(.printk_index) - LOAD_OFFSET) {		\
904 		__start_printk_index = .;				\
905 		*(.printk_index)					\
906 		__stop_printk_index = .;				\
907 	}
908 #else
909 #define PRINTK_INDEX
910 #endif
911 
912 #define NOTES								\
913 	.notes : AT(ADDR(.notes) - LOAD_OFFSET) {			\
914 		__start_notes = .;					\
915 		KEEP(*(.note.*))					\
916 		__stop_notes = .;					\
917 	} NOTES_HEADERS							\
918 	NOTES_HEADERS_RESTORE
919 
920 #define INIT_SETUP(initsetup_align)					\
921 		. = ALIGN(initsetup_align);				\
922 		__setup_start = .;					\
923 		KEEP(*(.init.setup))					\
924 		__setup_end = .;
925 
926 #define INIT_CALLS_LEVEL(level)						\
927 		__initcall##level##_start = .;				\
928 		KEEP(*(.initcall##level##.init))			\
929 		KEEP(*(.initcall##level##s.init))			\
930 
931 #define INIT_CALLS							\
932 		__initcall_start = .;					\
933 		KEEP(*(.initcallearly.init))				\
934 		INIT_CALLS_LEVEL(0)					\
935 		INIT_CALLS_LEVEL(1)					\
936 		INIT_CALLS_LEVEL(2)					\
937 		INIT_CALLS_LEVEL(3)					\
938 		INIT_CALLS_LEVEL(4)					\
939 		INIT_CALLS_LEVEL(5)					\
940 		INIT_CALLS_LEVEL(rootfs)				\
941 		INIT_CALLS_LEVEL(6)					\
942 		INIT_CALLS_LEVEL(7)					\
943 		__initcall_end = .;
944 
945 #define CON_INITCALL							\
946 		__con_initcall_start = .;				\
947 		KEEP(*(.con_initcall.init))				\
948 		__con_initcall_end = .;
949 
950 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */
951 #define KUNIT_TABLE()							\
952 		. = ALIGN(8);						\
953 		__kunit_suites_start = .;				\
954 		KEEP(*(.kunit_test_suites))				\
955 		__kunit_suites_end = .;
956 
957 #ifdef CONFIG_BLK_DEV_INITRD
958 #define INIT_RAM_FS							\
959 	. = ALIGN(4);							\
960 	__initramfs_start = .;						\
961 	KEEP(*(.init.ramfs))						\
962 	. = ALIGN(8);							\
963 	KEEP(*(.init.ramfs.info))
964 #else
965 #define INIT_RAM_FS
966 #endif
967 
968 /*
969  * Memory encryption operates on a page basis. Since we need to clear
970  * the memory encryption mask for this section, it needs to be aligned
971  * on a page boundary and be a page-size multiple in length.
972  *
973  * Note: We use a separate section so that only this section gets
974  * decrypted to avoid exposing more than we wish.
975  */
976 #ifdef CONFIG_AMD_MEM_ENCRYPT
977 #define PERCPU_DECRYPTED_SECTION					\
978 	. = ALIGN(PAGE_SIZE);						\
979 	*(.data..decrypted)						\
980 	*(.data..percpu..decrypted)					\
981 	. = ALIGN(PAGE_SIZE);
982 #else
983 #define PERCPU_DECRYPTED_SECTION
984 #endif
985 
986 
987 /*
988  * Default discarded sections.
989  *
990  * Some archs want to discard exit text/data at runtime rather than
991  * link time due to cross-section references such as alt instructions,
992  * bug table, eh_frame, etc.  DISCARDS must be the last of output
993  * section definitions so that such archs put those in earlier section
994  * definitions.
995  */
996 #ifdef RUNTIME_DISCARD_EXIT
997 #define EXIT_DISCARDS
998 #else
999 #define EXIT_DISCARDS							\
1000 	EXIT_TEXT							\
1001 	EXIT_DATA
1002 #endif
1003 
1004 /*
1005  * Clang's -fprofile-arcs, -fsanitize=kernel-address, and
1006  * -fsanitize=thread produce unwanted sections (.eh_frame
1007  * and .init_array.*), but CONFIG_CONSTRUCTORS wants to
1008  * keep any .init_array.* sections.
1009  * https://bugs.llvm.org/show_bug.cgi?id=46478
1010  */
1011 #if defined(CONFIG_GCOV_KERNEL) || defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN) || \
1012 	defined(CONFIG_CFI_CLANG)
1013 # ifdef CONFIG_CONSTRUCTORS
1014 #  define SANITIZER_DISCARDS						\
1015 	*(.eh_frame)
1016 # else
1017 #  define SANITIZER_DISCARDS						\
1018 	*(.init_array) *(.init_array.*)					\
1019 	*(.eh_frame)
1020 # endif
1021 #else
1022 # define SANITIZER_DISCARDS
1023 #endif
1024 
1025 #define COMMON_DISCARDS							\
1026 	SANITIZER_DISCARDS						\
1027 	*(.discard)							\
1028 	*(.discard.*)							\
1029 	*(.modinfo)							\
1030 	/* ld.bfd warns about .gnu.version* even when not emitted */	\
1031 	*(.gnu.version*)						\
1032 
1033 #define DISCARDS							\
1034 	/DISCARD/ : {							\
1035 	EXIT_DISCARDS							\
1036 	EXIT_CALL							\
1037 	COMMON_DISCARDS							\
1038 	}
1039 
1040 /**
1041  * PERCPU_INPUT - the percpu input sections
1042  * @cacheline: cacheline size
1043  *
1044  * The core percpu section names and core symbols which do not rely
1045  * directly upon load addresses.
1046  *
1047  * @cacheline is used to align subsections to avoid false cacheline
1048  * sharing between subsections for different purposes.
1049  */
1050 #define PERCPU_INPUT(cacheline)						\
1051 	__per_cpu_start = .;						\
1052 	*(.data..percpu..first)						\
1053 	. = ALIGN(PAGE_SIZE);						\
1054 	*(.data..percpu..page_aligned)					\
1055 	. = ALIGN(cacheline);						\
1056 	*(.data..percpu..read_mostly)					\
1057 	. = ALIGN(cacheline);						\
1058 	*(.data..percpu)						\
1059 	*(.data..percpu..shared_aligned)				\
1060 	PERCPU_DECRYPTED_SECTION					\
1061 	__per_cpu_end = .;
1062 
1063 /**
1064  * PERCPU_VADDR - define output section for percpu area
1065  * @cacheline: cacheline size
1066  * @vaddr: explicit base address (optional)
1067  * @phdr: destination PHDR (optional)
1068  *
1069  * Macro which expands to output section for percpu area.
1070  *
1071  * @cacheline is used to align subsections to avoid false cacheline
1072  * sharing between subsections for different purposes.
1073  *
1074  * If @vaddr is not blank, it specifies explicit base address and all
1075  * percpu symbols will be offset from the given address.  If blank,
1076  * @vaddr always equals @laddr + LOAD_OFFSET.
1077  *
1078  * @phdr defines the output PHDR to use if not blank.  Be warned that
1079  * output PHDR is sticky.  If @phdr is specified, the next output
1080  * section in the linker script will go there too.  @phdr should have
1081  * a leading colon.
1082  *
1083  * Note that this macros defines __per_cpu_load as an absolute symbol.
1084  * If there is no need to put the percpu section at a predetermined
1085  * address, use PERCPU_SECTION.
1086  */
1087 #define PERCPU_VADDR(cacheline, vaddr, phdr)				\
1088 	__per_cpu_load = .;						\
1089 	.data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) {	\
1090 		PERCPU_INPUT(cacheline)					\
1091 	} phdr								\
1092 	. = __per_cpu_load + SIZEOF(.data..percpu);
1093 
1094 /**
1095  * PERCPU_SECTION - define output section for percpu area, simple version
1096  * @cacheline: cacheline size
1097  *
1098  * Align to PAGE_SIZE and outputs output section for percpu area.  This
1099  * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
1100  * __per_cpu_start will be identical.
1101  *
1102  * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
1103  * except that __per_cpu_load is defined as a relative symbol against
1104  * .data..percpu which is required for relocatable x86_32 configuration.
1105  */
1106 #define PERCPU_SECTION(cacheline)					\
1107 	. = ALIGN(PAGE_SIZE);						\
1108 	.data..percpu	: AT(ADDR(.data..percpu) - LOAD_OFFSET) {	\
1109 		__per_cpu_load = .;					\
1110 		PERCPU_INPUT(cacheline)					\
1111 	}
1112 
1113 
1114 /*
1115  * Definition of the high level *_SECTION macros
1116  * They will fit only a subset of the architectures
1117  */
1118 
1119 
1120 /*
1121  * Writeable data.
1122  * All sections are combined in a single .data section.
1123  * The sections following CONSTRUCTORS are arranged so their
1124  * typical alignment matches.
1125  * A cacheline is typical/always less than a PAGE_SIZE so
1126  * the sections that has this restriction (or similar)
1127  * is located before the ones requiring PAGE_SIZE alignment.
1128  * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
1129  * matches the requirement of PAGE_ALIGNED_DATA.
1130  *
1131  * use 0 as page_align if page_aligned data is not used */
1132 #define RW_DATA(cacheline, pagealigned, inittask)			\
1133 	. = ALIGN(PAGE_SIZE);						\
1134 	.data : AT(ADDR(.data) - LOAD_OFFSET) {				\
1135 		INIT_TASK_DATA(inittask)				\
1136 		NOSAVE_DATA						\
1137 		PAGE_ALIGNED_DATA(pagealigned)				\
1138 		CACHELINE_ALIGNED_DATA(cacheline)			\
1139 		READ_MOSTLY_DATA(cacheline)				\
1140 		DATA_DATA						\
1141 		CONSTRUCTORS						\
1142 	}								\
1143 	BUG_TABLE							\
1144 
1145 #define INIT_TEXT_SECTION(inittext_align)				\
1146 	. = ALIGN(inittext_align);					\
1147 	.init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {		\
1148 		_sinittext = .;						\
1149 		INIT_TEXT						\
1150 		_einittext = .;						\
1151 	}
1152 
1153 #define INIT_DATA_SECTION(initsetup_align)				\
1154 	.init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {		\
1155 		INIT_DATA						\
1156 		INIT_SETUP(initsetup_align)				\
1157 		INIT_CALLS						\
1158 		CON_INITCALL						\
1159 		INIT_RAM_FS						\
1160 	}
1161 
1162 #define BSS_SECTION(sbss_align, bss_align, stop_align)			\
1163 	. = ALIGN(sbss_align);						\
1164 	__bss_start = .;						\
1165 	SBSS(sbss_align)						\
1166 	BSS(bss_align)							\
1167 	. = ALIGN(stop_align);						\
1168 	__bss_stop = .;
1169