| blob | 278841c75b97b0f55431e75c3a172a041f43f94b |
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 */
53 #ifndef LOAD_OFFSET
54 #define LOAD_OFFSET 0
55 #endif
57 #include <linux/export.h>
59 /* Align . to a 8 byte boundary equals to maximum function alignment. */
60 #define ALIGN_FUNCTION() . = ALIGN(8)
62 /*
63 * LD_DEAD_CODE_DATA_ELIMINATION option enables -fdata-sections, which
64 * generates .data.identifier sections, which need to be pulled in with
65 * .data. We don't want to pull in .data..other sections, which Linux
66 * has defined. Same for text and bss.
67 */
68 #ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
69 #define TEXT_MAIN .text .text.[0-9a-zA-Z_]*
70 #define DATA_MAIN .data .data.[0-9a-zA-Z_]*
71 #define BSS_MAIN .bss .bss.[0-9a-zA-Z_]*
72 #else
73 #define TEXT_MAIN .text
74 #define DATA_MAIN .data
75 #define BSS_MAIN .bss
76 #endif
78 /*
79 * Align to a 32 byte boundary equal to the
80 * alignment gcc 4.5 uses for a struct
81 */
82 #define STRUCT_ALIGNMENT 32
83 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
85 /* The actual configuration determine if the init/exit sections
86 * are handled as text/data or they can be discarded (which
87 * often happens at runtime)
88 */
89 #ifdef CONFIG_HOTPLUG_CPU
90 #define CPU_KEEP(sec) *(.cpu##sec)
91 #define CPU_DISCARD(sec)
92 #else
93 #define CPU_KEEP(sec)
94 #define CPU_DISCARD(sec) *(.cpu##sec)
95 #endif
97 #if defined(CONFIG_MEMORY_HOTPLUG)
98 #define MEM_KEEP(sec) *(.mem##sec)
99 #define MEM_DISCARD(sec)
100 #else
101 #define MEM_KEEP(sec)
102 #define MEM_DISCARD(sec) *(.mem##sec)
103 #endif
105 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
106 #define MCOUNT_REC() . = ALIGN(8); \
107 VMLINUX_SYMBOL(__start_mcount_loc) = .; \
108 *(__mcount_loc) \
109 VMLINUX_SYMBOL(__stop_mcount_loc) = .;
110 #else
111 #define MCOUNT_REC()
112 #endif
114 #ifdef CONFIG_TRACE_BRANCH_PROFILING
115 #define LIKELY_PROFILE() VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \
116 *(_ftrace_annotated_branch) \
117 VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .;
118 #else
119 #define LIKELY_PROFILE()
120 #endif
122 #ifdef CONFIG_PROFILE_ALL_BRANCHES
123 #define BRANCH_PROFILE() VMLINUX_SYMBOL(__start_branch_profile) = .; \
124 *(_ftrace_branch) \
125 VMLINUX_SYMBOL(__stop_branch_profile) = .;
126 #else
127 #define BRANCH_PROFILE()
128 #endif
130 #ifdef CONFIG_KPROBES
131 #define KPROBE_BLACKLIST() . = ALIGN(8); \
132 VMLINUX_SYMBOL(__start_kprobe_blacklist) = .; \
133 KEEP(*(_kprobe_blacklist)) \
134 VMLINUX_SYMBOL(__stop_kprobe_blacklist) = .;
135 #else
136 #define KPROBE_BLACKLIST()
137 #endif
139 #ifdef CONFIG_FUNCTION_ERROR_INJECTION
140 #define ERROR_INJECT_WHITELIST() STRUCT_ALIGN(); \
141 VMLINUX_SYMBOL(__start_error_injection_whitelist) = .;\
142 KEEP(*(_error_injection_whitelist)) \
143 VMLINUX_SYMBOL(__stop_error_injection_whitelist) = .;
144 #else
145 #define ERROR_INJECT_WHITELIST()
146 #endif
148 #ifdef CONFIG_EVENT_TRACING
149 #define FTRACE_EVENTS() . = ALIGN(8); \
150 VMLINUX_SYMBOL(__start_ftrace_events) = .; \
151 KEEP(*(_ftrace_events)) \
152 VMLINUX_SYMBOL(__stop_ftrace_events) = .; \
153 VMLINUX_SYMBOL(__start_ftrace_eval_maps) = .; \
154 KEEP(*(_ftrace_eval_map)) \
155 VMLINUX_SYMBOL(__stop_ftrace_eval_maps) = .;
156 #else
157 #define FTRACE_EVENTS()
158 #endif
160 #ifdef CONFIG_TRACING
161 #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .; \
163 VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;
164 #define TRACEPOINT_STR() VMLINUX_SYMBOL(__start___tracepoint_str) = .; \
166 VMLINUX_SYMBOL(__stop___tracepoint_str) = .;
167 #else
168 #define TRACE_PRINTKS()
169 #define TRACEPOINT_STR()
170 #endif
172 #ifdef CONFIG_FTRACE_SYSCALLS
173 #define TRACE_SYSCALLS() . = ALIGN(8); \
174 VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \
175 KEEP(*(__syscalls_metadata)) \
176 VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
177 #else
178 #define TRACE_SYSCALLS()
179 #endif
181 #ifdef CONFIG_BPF_EVENTS
182 #define BPF_RAW_TP() STRUCT_ALIGN(); \
183 VMLINUX_SYMBOL(__start__bpf_raw_tp) = .; \
184 KEEP(*(__bpf_raw_tp_map)) \
185 VMLINUX_SYMBOL(__stop__bpf_raw_tp) = .;
186 #else
187 #define BPF_RAW_TP()
188 #endif
190 #ifdef CONFIG_SERIAL_EARLYCON
191 #define EARLYCON_TABLE() STRUCT_ALIGN(); \
192 VMLINUX_SYMBOL(__earlycon_table) = .; \
193 KEEP(*(__earlycon_table)) \
194 VMLINUX_SYMBOL(__earlycon_table_end) = .;
195 #else
196 #define EARLYCON_TABLE()
197 #endif
199 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name)
200 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name)
201 #define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name)
202 #define _OF_TABLE_0(name)
203 #define _OF_TABLE_1(name) \
204 . = ALIGN(8); \
205 VMLINUX_SYMBOL(__##name##_of_table) = .; \
206 KEEP(*(__##name##_of_table)) \
207 KEEP(*(__##name##_of_table_end))
209 #define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer)
210 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
211 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk)
212 #define IOMMU_OF_TABLES() OF_TABLE(CONFIG_OF_IOMMU, iommu)
213 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
214 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method)
215 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method)
217 #ifdef CONFIG_ACPI
218 #define ACPI_PROBE_TABLE(name) \
219 . = ALIGN(8); \
220 VMLINUX_SYMBOL(__##name##_acpi_probe_table) = .; \
221 KEEP(*(__##name##_acpi_probe_table)) \
222 VMLINUX_SYMBOL(__##name##_acpi_probe_table_end) = .;
223 #else
224 #define ACPI_PROBE_TABLE(name)
225 #endif
227 #define KERNEL_DTB() \
228 STRUCT_ALIGN(); \
229 VMLINUX_SYMBOL(__dtb_start) = .; \
230 KEEP(*(.dtb.init.rodata)) \
231 VMLINUX_SYMBOL(__dtb_end) = .;
233 /*
234 * .data section
235 */
236 #define DATA_DATA \
237 *(.xiptext) \
238 *(DATA_MAIN) \
239 *(.ref.data) \
241 MEM_KEEP(init.data) \
242 MEM_KEEP(exit.data) \
243 *(.data.unlikely) \
244 VMLINUX_SYMBOL(__start_once) = .; \
245 *(.data.once) \
246 VMLINUX_SYMBOL(__end_once) = .; \
247 STRUCT_ALIGN(); \
248 *(__tracepoints) \
250 . = ALIGN(8); \
251 VMLINUX_SYMBOL(__start___jump_table) = .; \
252 KEEP(*(__jump_table)) \
253 VMLINUX_SYMBOL(__stop___jump_table) = .; \
254 . = ALIGN(8); \
255 VMLINUX_SYMBOL(__start___verbose) = .; \
256 KEEP(*(__verbose)) \
257 VMLINUX_SYMBOL(__stop___verbose) = .; \
258 LIKELY_PROFILE() \
259 BRANCH_PROFILE() \
260 TRACE_PRINTKS() \
261 BPF_RAW_TP() \
262 TRACEPOINT_STR()
264 /*
265 * Data section helpers
266 */
267 #define NOSAVE_DATA \
268 . = ALIGN(PAGE_SIZE); \
269 VMLINUX_SYMBOL(__nosave_begin) = .; \
270 *(.data..nosave) \
271 . = ALIGN(PAGE_SIZE); \
272 VMLINUX_SYMBOL(__nosave_end) = .;
274 #define PAGE_ALIGNED_DATA(page_align) \
275 . = ALIGN(page_align); \
276 *(.data..page_aligned)
278 #define READ_MOSTLY_DATA(align) \
279 . = ALIGN(align); \
280 *(.data..read_mostly) \
281 . = ALIGN(align);
283 #define CACHELINE_ALIGNED_DATA(align) \
284 . = ALIGN(align); \
285 *(.data..cacheline_aligned)
287 #define INIT_TASK_DATA(align) \
288 . = ALIGN(align); \
289 VMLINUX_SYMBOL(__start_init_task) = .; \
290 VMLINUX_SYMBOL(init_thread_union) = .; \
291 VMLINUX_SYMBOL(init_stack) = .; \
292 *(.data..init_task) \
293 *(.data..init_thread_info) \
294 . = VMLINUX_SYMBOL(__start_init_task) + THREAD_SIZE; \
295 VMLINUX_SYMBOL(__end_init_task) = .;
297 /*
298 * Allow architectures to handle ro_after_init data on their
299 * own by defining an empty RO_AFTER_INIT_DATA.
300 */
301 #ifndef RO_AFTER_INIT_DATA
302 #define RO_AFTER_INIT_DATA \
303 VMLINUX_SYMBOL(__start_ro_after_init) = .; \
304 *(.data..ro_after_init) \
305 VMLINUX_SYMBOL(__end_ro_after_init) = .;
306 #endif
308 /*
309 * Read only Data
310 */
311 #define RO_DATA_SECTION(align) \
312 . = ALIGN((align)); \
313 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
314 VMLINUX_SYMBOL(__start_rodata) = .; \
315 *(.rodata) *(.rodata.*) \
318 . = ALIGN(8); \
319 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .; \
321 VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .; \
323 } \
324 \
325 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \
326 *(.rodata1) \
327 } \
328 \
330 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \
331 VMLINUX_SYMBOL(__start_pci_fixups_early) = .; \
332 KEEP(*(.pci_fixup_early)) \
333 VMLINUX_SYMBOL(__end_pci_fixups_early) = .; \
334 VMLINUX_SYMBOL(__start_pci_fixups_header) = .; \
335 KEEP(*(.pci_fixup_header)) \
336 VMLINUX_SYMBOL(__end_pci_fixups_header) = .; \
337 VMLINUX_SYMBOL(__start_pci_fixups_final) = .; \
338 KEEP(*(.pci_fixup_final)) \
339 VMLINUX_SYMBOL(__end_pci_fixups_final) = .; \
340 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .; \
341 KEEP(*(.pci_fixup_enable)) \
342 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .; \
343 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .; \
344 KEEP(*(.pci_fixup_resume)) \
345 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .; \
346 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .; \
347 KEEP(*(.pci_fixup_resume_early)) \
348 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .; \
349 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .; \
350 KEEP(*(.pci_fixup_suspend)) \
351 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .; \
352 VMLINUX_SYMBOL(__start_pci_fixups_suspend_late) = .; \
353 KEEP(*(.pci_fixup_suspend_late)) \
354 VMLINUX_SYMBOL(__end_pci_fixups_suspend_late) = .; \
355 } \
356 \
358 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \
359 VMLINUX_SYMBOL(__start_builtin_fw) = .; \
360 KEEP(*(.builtin_fw)) \
361 VMLINUX_SYMBOL(__end_builtin_fw) = .; \
362 } \
363 \
364 TRACEDATA \
365 \
367 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \
368 VMLINUX_SYMBOL(__start___ksymtab) = .; \
369 KEEP(*(SORT(___ksymtab+*))) \
370 VMLINUX_SYMBOL(__stop___ksymtab) = .; \
371 } \
372 \
374 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \
375 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .; \
376 KEEP(*(SORT(___ksymtab_gpl+*))) \
377 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .; \
378 } \
379 \
381 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \
382 VMLINUX_SYMBOL(__start___ksymtab_unused) = .; \
383 KEEP(*(SORT(___ksymtab_unused+*))) \
384 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .; \
385 } \
386 \
388 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
389 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .; \
390 KEEP(*(SORT(___ksymtab_unused_gpl+*))) \
391 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .; \
392 } \
393 \
395 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
396 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .; \
397 KEEP(*(SORT(___ksymtab_gpl_future+*))) \
398 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .; \
399 } \
400 \
402 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \
403 VMLINUX_SYMBOL(__start___kcrctab) = .; \
404 KEEP(*(SORT(___kcrctab+*))) \
405 VMLINUX_SYMBOL(__stop___kcrctab) = .; \
406 } \
407 \
409 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \
410 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .; \
411 KEEP(*(SORT(___kcrctab_gpl+*))) \
412 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .; \
413 } \
414 \
416 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \
417 VMLINUX_SYMBOL(__start___kcrctab_unused) = .; \
418 KEEP(*(SORT(___kcrctab_unused+*))) \
419 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .; \
420 } \
421 \
423 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
424 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .; \
425 KEEP(*(SORT(___kcrctab_unused_gpl+*))) \
426 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .; \
427 } \
428 \
430 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
431 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .; \
432 KEEP(*(SORT(___kcrctab_gpl_future+*))) \
433 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .; \
434 } \
435 \
437 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
438 *(__ksymtab_strings) \
439 } \
440 \
442 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \
443 *(.ref.rodata) \
444 MEM_KEEP(init.rodata) \
445 MEM_KEEP(exit.rodata) \
446 } \
447 \
449 __param : AT(ADDR(__param) - LOAD_OFFSET) { \
450 VMLINUX_SYMBOL(__start___param) = .; \
451 KEEP(*(__param)) \
452 VMLINUX_SYMBOL(__stop___param) = .; \
453 } \
454 \
456 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \
457 VMLINUX_SYMBOL(__start___modver) = .; \
458 KEEP(*(__modver)) \
459 VMLINUX_SYMBOL(__stop___modver) = .; \
460 . = ALIGN((align)); \
461 VMLINUX_SYMBOL(__end_rodata) = .; \
462 } \
463 . = ALIGN((align));
465 /* RODATA & RO_DATA provided for backward compatibility.
466 * All archs are supposed to use RO_DATA() */
467 #define RODATA RO_DATA_SECTION(4096)
468 #define RO_DATA(align) RO_DATA_SECTION(align)
470 #define SECURITY_INIT \
471 .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
472 VMLINUX_SYMBOL(__security_initcall_start) = .; \
473 KEEP(*(.security_initcall.init)) \
474 VMLINUX_SYMBOL(__security_initcall_end) = .; \
475 }
477 /*
478 * .text section. Map to function alignment to avoid address changes
479 * during second ld run in second ld pass when generating System.map
480 *
481 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead
482 * code elimination is enabled, so these sections should be converted
483 * to use ".." first.
484 */
485 #define TEXT_TEXT \
486 ALIGN_FUNCTION(); \
487 *(.text.hot TEXT_MAIN .text.fixup .text.unlikely) \
488 *(.text..refcount) \
489 *(.ref.text) \
490 MEM_KEEP(init.text) \
491 MEM_KEEP(exit.text) \
494 /* sched.text is aling to function alignment to secure we have same
495 * address even at second ld pass when generating System.map */
496 #define SCHED_TEXT \
497 ALIGN_FUNCTION(); \
498 VMLINUX_SYMBOL(__sched_text_start) = .; \
499 *(.sched.text) \
500 VMLINUX_SYMBOL(__sched_text_end) = .;
502 /* spinlock.text is aling to function alignment to secure we have same
503 * address even at second ld pass when generating System.map */
504 #define LOCK_TEXT \
505 ALIGN_FUNCTION(); \
506 VMLINUX_SYMBOL(__lock_text_start) = .; \
507 *(.spinlock.text) \
508 VMLINUX_SYMBOL(__lock_text_end) = .;
510 #define CPUIDLE_TEXT \
511 ALIGN_FUNCTION(); \
512 VMLINUX_SYMBOL(__cpuidle_text_start) = .; \
513 *(.cpuidle.text) \
514 VMLINUX_SYMBOL(__cpuidle_text_end) = .;
516 #define KPROBES_TEXT \
517 ALIGN_FUNCTION(); \
518 VMLINUX_SYMBOL(__kprobes_text_start) = .; \
519 *(.kprobes.text) \
520 VMLINUX_SYMBOL(__kprobes_text_end) = .;
522 #define ENTRY_TEXT \
523 ALIGN_FUNCTION(); \
524 VMLINUX_SYMBOL(__entry_text_start) = .; \
525 *(.entry.text) \
526 VMLINUX_SYMBOL(__entry_text_end) = .;
528 #define IRQENTRY_TEXT \
529 ALIGN_FUNCTION(); \
530 VMLINUX_SYMBOL(__irqentry_text_start) = .; \
531 *(.irqentry.text) \
532 VMLINUX_SYMBOL(__irqentry_text_end) = .;
534 #define SOFTIRQENTRY_TEXT \
535 ALIGN_FUNCTION(); \
536 VMLINUX_SYMBOL(__softirqentry_text_start) = .; \
537 *(.softirqentry.text) \
538 VMLINUX_SYMBOL(__softirqentry_text_end) = .;
540 /* Section used for early init (in .S files) */
541 #define HEAD_TEXT *(.head.text)
543 #define HEAD_TEXT_SECTION \
544 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \
545 HEAD_TEXT \
546 }
548 /*
549 * Exception table
550 */
551 #define EXCEPTION_TABLE(align) \
552 . = ALIGN(align); \
553 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \
554 VMLINUX_SYMBOL(__start___ex_table) = .; \
555 KEEP(*(__ex_table)) \
556 VMLINUX_SYMBOL(__stop___ex_table) = .; \
557 }
559 /*
560 * Init task
561 */
562 #define INIT_TASK_DATA_SECTION(align) \
563 . = ALIGN(align); \
564 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \
565 INIT_TASK_DATA(align) \
566 }
568 #ifdef CONFIG_CONSTRUCTORS
569 #define KERNEL_CTORS() . = ALIGN(8); \
570 VMLINUX_SYMBOL(__ctors_start) = .; \
571 KEEP(*(.ctors)) \
572 KEEP(*(SORT(.init_array.*))) \
573 KEEP(*(.init_array)) \
574 VMLINUX_SYMBOL(__ctors_end) = .;
575 #else
576 #define KERNEL_CTORS()
577 #endif
579 /* init and exit section handling */
580 #define INIT_DATA \
581 KEEP(*(SORT(___kentry+*))) \
582 *(.init.data) \
583 MEM_DISCARD(init.data) \
584 KERNEL_CTORS() \
585 MCOUNT_REC() \
586 *(.init.rodata) \
587 FTRACE_EVENTS() \
588 TRACE_SYSCALLS() \
589 KPROBE_BLACKLIST() \
590 ERROR_INJECT_WHITELIST() \
591 MEM_DISCARD(init.rodata) \
592 CLK_OF_TABLES() \
593 RESERVEDMEM_OF_TABLES() \
594 TIMER_OF_TABLES() \
595 IOMMU_OF_TABLES() \
596 CPU_METHOD_OF_TABLES() \
597 CPUIDLE_METHOD_OF_TABLES() \
598 KERNEL_DTB() \
599 IRQCHIP_OF_MATCH_TABLE() \
600 ACPI_PROBE_TABLE(irqchip) \
601 ACPI_PROBE_TABLE(timer) \
602 EARLYCON_TABLE()
604 #define INIT_TEXT \
605 *(.init.text) \
606 *(.text.startup) \
607 MEM_DISCARD(init.text)
609 #define EXIT_DATA \
610 *(.exit.data) \
611 *(.fini_array) \
612 *(.dtors) \
613 MEM_DISCARD(exit.data) \
614 MEM_DISCARD(exit.rodata)
616 #define EXIT_TEXT \
617 *(.exit.text) \
618 *(.text.exit) \
619 MEM_DISCARD(exit.text)
621 #define EXIT_CALL \
622 *(.exitcall.exit)
624 /*
625 * bss (Block Started by Symbol) - uninitialized data
626 * zeroed during startup
627 */
628 #define SBSS(sbss_align) \
629 . = ALIGN(sbss_align); \
630 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \
631 *(.dynsbss) \
632 *(.sbss) \
633 *(.scommon) \
634 }
636 /*
637 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
638 * sections to the front of bss.
639 */
640 #ifndef BSS_FIRST_SECTIONS
641 #define BSS_FIRST_SECTIONS
642 #endif
644 #define BSS(bss_align) \
645 . = ALIGN(bss_align); \
646 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \
647 BSS_FIRST_SECTIONS \
648 *(.bss..page_aligned) \
649 *(.dynbss) \
650 *(BSS_MAIN) \
651 *(COMMON) \
652 }
654 /*
655 * DWARF debug sections.
656 * Symbols in the DWARF debugging sections are relative to
657 * the beginning of the section so we begin them at 0.
658 */
659 #define DWARF_DEBUG \
661 .debug 0 : { *(.debug) } \
662 .line 0 : { *(.line) } \
664 .debug_srcinfo 0 : { *(.debug_srcinfo) } \
665 .debug_sfnames 0 : { *(.debug_sfnames) } \
667 .debug_aranges 0 : { *(.debug_aranges) } \
668 .debug_pubnames 0 : { *(.debug_pubnames) } \
670 .debug_info 0 : { *(.debug_info \
671 .gnu.linkonce.wi.*) } \
672 .debug_abbrev 0 : { *(.debug_abbrev) } \
673 .debug_line 0 : { *(.debug_line) } \
674 .debug_frame 0 : { *(.debug_frame) } \
675 .debug_str 0 : { *(.debug_str) } \
676 .debug_loc 0 : { *(.debug_loc) } \
677 .debug_macinfo 0 : { *(.debug_macinfo) } \
678 .debug_pubtypes 0 : { *(.debug_pubtypes) } \
680 .debug_ranges 0 : { *(.debug_ranges) } \
682 .debug_weaknames 0 : { *(.debug_weaknames) } \
683 .debug_funcnames 0 : { *(.debug_funcnames) } \
684 .debug_typenames 0 : { *(.debug_typenames) } \
685 .debug_varnames 0 : { *(.debug_varnames) } \
687 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \
688 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \
690 .debug_types 0 : { *(.debug_types) } \
692 .debug_macro 0 : { *(.debug_macro) } \
693 .debug_addr 0 : { *(.debug_addr) }
695 /* Stabs debugging sections. */
696 #define STABS_DEBUG \
697 .stab 0 : { *(.stab) } \
698 .stabstr 0 : { *(.stabstr) } \
699 .stab.excl 0 : { *(.stab.excl) } \
700 .stab.exclstr 0 : { *(.stab.exclstr) } \
701 .stab.index 0 : { *(.stab.index) } \
702 .stab.indexstr 0 : { *(.stab.indexstr) } \
703 .comment 0 : { *(.comment) }
705 #ifdef CONFIG_GENERIC_BUG
706 #define BUG_TABLE \
707 . = ALIGN(8); \
708 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \
709 VMLINUX_SYMBOL(__start___bug_table) = .; \
710 KEEP(*(__bug_table)) \
711 VMLINUX_SYMBOL(__stop___bug_table) = .; \
712 }
713 #else
714 #define BUG_TABLE
715 #endif
717 #ifdef CONFIG_UNWINDER_ORC
718 #define ORC_UNWIND_TABLE \
719 . = ALIGN(4); \
720 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \
721 VMLINUX_SYMBOL(__start_orc_unwind_ip) = .; \
722 KEEP(*(.orc_unwind_ip)) \
723 VMLINUX_SYMBOL(__stop_orc_unwind_ip) = .; \
724 } \
725 . = ALIGN(6); \
726 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \
727 VMLINUX_SYMBOL(__start_orc_unwind) = .; \
728 KEEP(*(.orc_unwind)) \
729 VMLINUX_SYMBOL(__stop_orc_unwind) = .; \
730 } \
731 . = ALIGN(4); \
732 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \
733 VMLINUX_SYMBOL(orc_lookup) = .; \
734 . += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) / \
735 LOOKUP_BLOCK_SIZE) + 1) * 4; \
736 VMLINUX_SYMBOL(orc_lookup_end) = .; \
737 }
738 #else
739 #define ORC_UNWIND_TABLE
740 #endif
742 #ifdef CONFIG_PM_TRACE
743 #define TRACEDATA \
744 . = ALIGN(4); \
745 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \
746 VMLINUX_SYMBOL(__tracedata_start) = .; \
747 KEEP(*(.tracedata)) \
748 VMLINUX_SYMBOL(__tracedata_end) = .; \
749 }
750 #else
751 #define TRACEDATA
752 #endif
754 #define NOTES \
755 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \
756 VMLINUX_SYMBOL(__start_notes) = .; \
757 *(.note.*) \
758 VMLINUX_SYMBOL(__stop_notes) = .; \
759 }
761 #define INIT_SETUP(initsetup_align) \
762 . = ALIGN(initsetup_align); \
763 VMLINUX_SYMBOL(__setup_start) = .; \
764 KEEP(*(.init.setup)) \
765 VMLINUX_SYMBOL(__setup_end) = .;
767 #define INIT_CALLS_LEVEL(level) \
768 VMLINUX_SYMBOL(__initcall##level##_start) = .; \
769 KEEP(*(.initcall##level##.init)) \
770 KEEP(*(.initcall##level##s.init)) \
772 #define INIT_CALLS \
773 VMLINUX_SYMBOL(__initcall_start) = .; \
774 KEEP(*(.initcallearly.init)) \
775 INIT_CALLS_LEVEL(0) \
776 INIT_CALLS_LEVEL(1) \
777 INIT_CALLS_LEVEL(2) \
778 INIT_CALLS_LEVEL(3) \
779 INIT_CALLS_LEVEL(4) \
780 INIT_CALLS_LEVEL(5) \
781 INIT_CALLS_LEVEL(rootfs) \
782 INIT_CALLS_LEVEL(6) \
783 INIT_CALLS_LEVEL(7) \
784 VMLINUX_SYMBOL(__initcall_end) = .;
786 #define CON_INITCALL \
787 VMLINUX_SYMBOL(__con_initcall_start) = .; \
788 KEEP(*(.con_initcall.init)) \
789 VMLINUX_SYMBOL(__con_initcall_end) = .;
791 #define SECURITY_INITCALL \
792 VMLINUX_SYMBOL(__security_initcall_start) = .; \
793 KEEP(*(.security_initcall.init)) \
794 VMLINUX_SYMBOL(__security_initcall_end) = .;
796 #ifdef CONFIG_BLK_DEV_INITRD
797 #define INIT_RAM_FS \
798 . = ALIGN(4); \
799 VMLINUX_SYMBOL(__initramfs_start) = .; \
800 KEEP(*(.init.ramfs)) \
801 . = ALIGN(8); \
802 KEEP(*(.init.ramfs.info))
803 #else
804 #define INIT_RAM_FS
805 #endif
807 /*
808 * Memory encryption operates on a page basis. Since we need to clear
809 * the memory encryption mask for this section, it needs to be aligned
810 * on a page boundary and be a page-size multiple in length.
811 *
812 * Note: We use a separate section so that only this section gets
813 * decrypted to avoid exposing more than we wish.
814 */
815 #ifdef CONFIG_AMD_MEM_ENCRYPT
816 #define PERCPU_DECRYPTED_SECTION \
817 . = ALIGN(PAGE_SIZE); \
818 *(.data..percpu..decrypted) \
819 . = ALIGN(PAGE_SIZE);
820 #else
821 #define PERCPU_DECRYPTED_SECTION
822 #endif
825 /*
826 * Default discarded sections.
827 *
828 * Some archs want to discard exit text/data at runtime rather than
829 * link time due to cross-section references such as alt instructions,
830 * bug table, eh_frame, etc. DISCARDS must be the last of output
831 * section definitions so that such archs put those in earlier section
832 * definitions.
833 */
834 #define DISCARDS \
835 /DISCARD/ : { \
836 EXIT_TEXT \
837 EXIT_DATA \
838 EXIT_CALL \
839 *(.discard) \
840 *(.discard.*) \
841 }
843 /**
844 * PERCPU_INPUT - the percpu input sections
845 * @cacheline: cacheline size
846 *
847 * The core percpu section names and core symbols which do not rely
848 * directly upon load addresses.
849 *
850 * @cacheline is used to align subsections to avoid false cacheline
851 * sharing between subsections for different purposes.
852 */
853 #define PERCPU_INPUT(cacheline) \
854 VMLINUX_SYMBOL(__per_cpu_start) = .; \
855 *(.data..percpu..first) \
856 . = ALIGN(PAGE_SIZE); \
857 *(.data..percpu..page_aligned) \
858 . = ALIGN(cacheline); \
859 *(.data..percpu..read_mostly) \
860 . = ALIGN(cacheline); \
861 *(.data..percpu) \
862 *(.data..percpu..shared_aligned) \
863 PERCPU_DECRYPTED_SECTION \
864 VMLINUX_SYMBOL(__per_cpu_end) = .;
866 /**
867 * PERCPU_VADDR - define output section for percpu area
868 * @cacheline: cacheline size
869 * @vaddr: explicit base address (optional)
870 * @phdr: destination PHDR (optional)
871 *
872 * Macro which expands to output section for percpu area.
873 *
874 * @cacheline is used to align subsections to avoid false cacheline
875 * sharing between subsections for different purposes.
876 *
877 * If @vaddr is not blank, it specifies explicit base address and all
878 * percpu symbols will be offset from the given address. If blank,
879 * @vaddr always equals @laddr + LOAD_OFFSET.
880 *
881 * @phdr defines the output PHDR to use if not blank. Be warned that
882 * output PHDR is sticky. If @phdr is specified, the next output
883 * section in the linker script will go there too. @phdr should have
884 * a leading colon.
885 *
886 * Note that this macros defines __per_cpu_load as an absolute symbol.
887 * If there is no need to put the percpu section at a predetermined
888 * address, use PERCPU_SECTION.
889 */
890 #define PERCPU_VADDR(cacheline, vaddr, phdr) \
891 VMLINUX_SYMBOL(__per_cpu_load) = .; \
892 .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load) \
893 - LOAD_OFFSET) { \
894 PERCPU_INPUT(cacheline) \
895 } phdr \
896 . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
898 /**
899 * PERCPU_SECTION - define output section for percpu area, simple version
900 * @cacheline: cacheline size
901 *
902 * Align to PAGE_SIZE and outputs output section for percpu area. This
903 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
904 * __per_cpu_start will be identical.
905 *
906 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
907 * except that __per_cpu_load is defined as a relative symbol against
908 * .data..percpu which is required for relocatable x86_32 configuration.
909 */
910 #define PERCPU_SECTION(cacheline) \
911 . = ALIGN(PAGE_SIZE); \
912 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \
913 VMLINUX_SYMBOL(__per_cpu_load) = .; \
914 PERCPU_INPUT(cacheline) \
915 }
918 /*
919 * Definition of the high level *_SECTION macros
920 * They will fit only a subset of the architectures
921 */
924 /*
925 * Writeable data.
926 * All sections are combined in a single .data section.
927 * The sections following CONSTRUCTORS are arranged so their
928 * typical alignment matches.
929 * A cacheline is typical/always less than a PAGE_SIZE so
930 * the sections that has this restriction (or similar)
931 * is located before the ones requiring PAGE_SIZE alignment.
932 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
933 * matches the requirement of PAGE_ALIGNED_DATA.
934 *
935 * use 0 as page_align if page_aligned data is not used */
936 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \
937 . = ALIGN(PAGE_SIZE); \
938 .data : AT(ADDR(.data) - LOAD_OFFSET) { \
939 INIT_TASK_DATA(inittask) \
940 NOSAVE_DATA \
941 PAGE_ALIGNED_DATA(pagealigned) \
942 CACHELINE_ALIGNED_DATA(cacheline) \
943 READ_MOSTLY_DATA(cacheline) \
944 DATA_DATA \
945 CONSTRUCTORS \
946 } \
947 BUG_TABLE \
949 #define INIT_TEXT_SECTION(inittext_align) \
950 . = ALIGN(inittext_align); \
951 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \
952 VMLINUX_SYMBOL(_sinittext) = .; \
953 INIT_TEXT \
954 VMLINUX_SYMBOL(_einittext) = .; \
955 }
957 #define INIT_DATA_SECTION(initsetup_align) \
958 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \
959 INIT_DATA \
960 INIT_SETUP(initsetup_align) \
961 INIT_CALLS \
962 CON_INITCALL \
963 SECURITY_INITCALL \
964 INIT_RAM_FS \
965 }
967 #define BSS_SECTION(sbss_align, bss_align, stop_align) \
968 . = ALIGN(sbss_align); \
969 VMLINUX_SYMBOL(__bss_start) = .; \
970 SBSS(sbss_align) \
971 BSS(bss_align) \
972 . = ALIGN(stop_align); \
973 VMLINUX_SYMBOL(__bss_stop) = .;