| blob | e373e2e10f6a96d192203491574ab3003f01a019 |
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 * RODATA_MAIN is not used because existing code already defines .rodata.x
69 * sections to be brought in with rodata.
70 */
71 #ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
72 #define TEXT_MAIN .text .text.[0-9a-zA-Z_]*
73 #define DATA_MAIN .data .data.[0-9a-zA-Z_]*
74 #define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]*
75 #define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]*
76 #define BSS_MAIN .bss .bss.[0-9a-zA-Z_]*
77 #define SBSS_MAIN .sbss .sbss.[0-9a-zA-Z_]*
78 #else
79 #define TEXT_MAIN .text
80 #define DATA_MAIN .data
81 #define SDATA_MAIN .sdata
82 #define RODATA_MAIN .rodata
83 #define BSS_MAIN .bss
84 #define SBSS_MAIN .sbss
85 #endif
87 /*
88 * Align to a 32 byte boundary equal to the
89 * alignment gcc 4.5 uses for a struct
90 */
91 #define STRUCT_ALIGNMENT 32
92 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
94 /* The actual configuration determine if the init/exit sections
95 * are handled as text/data or they can be discarded (which
96 * often happens at runtime)
97 */
98 #ifdef CONFIG_HOTPLUG_CPU
99 #define CPU_KEEP(sec) *(.cpu##sec)
100 #define CPU_DISCARD(sec)
101 #else
102 #define CPU_KEEP(sec)
103 #define CPU_DISCARD(sec) *(.cpu##sec)
104 #endif
106 #if defined(CONFIG_MEMORY_HOTPLUG)
107 #define MEM_KEEP(sec) *(.mem##sec)
108 #define MEM_DISCARD(sec)
109 #else
110 #define MEM_KEEP(sec)
111 #define MEM_DISCARD(sec) *(.mem##sec)
112 #endif
114 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
115 #define MCOUNT_REC() . = ALIGN(8); \
116 __start_mcount_loc = .; \
117 KEEP(*(__mcount_loc)) \
118 __stop_mcount_loc = .;
119 #else
120 #define MCOUNT_REC()
121 #endif
123 #ifdef CONFIG_TRACE_BRANCH_PROFILING
124 #define LIKELY_PROFILE() __start_annotated_branch_profile = .; \
125 KEEP(*(_ftrace_annotated_branch)) \
126 __stop_annotated_branch_profile = .;
127 #else
128 #define LIKELY_PROFILE()
129 #endif
131 #ifdef CONFIG_PROFILE_ALL_BRANCHES
132 #define BRANCH_PROFILE() __start_branch_profile = .; \
133 KEEP(*(_ftrace_branch)) \
134 __stop_branch_profile = .;
135 #else
136 #define BRANCH_PROFILE()
137 #endif
139 #ifdef CONFIG_KPROBES
140 #define KPROBE_BLACKLIST() . = ALIGN(8); \
141 __start_kprobe_blacklist = .; \
142 KEEP(*(_kprobe_blacklist)) \
143 __stop_kprobe_blacklist = .;
144 #else
145 #define KPROBE_BLACKLIST()
146 #endif
148 #ifdef CONFIG_FUNCTION_ERROR_INJECTION
149 #define ERROR_INJECT_WHITELIST() STRUCT_ALIGN(); \
150 __start_error_injection_whitelist = .; \
151 KEEP(*(_error_injection_whitelist)) \
152 __stop_error_injection_whitelist = .;
153 #else
154 #define ERROR_INJECT_WHITELIST()
155 #endif
157 #ifdef CONFIG_EVENT_TRACING
158 #define FTRACE_EVENTS() . = ALIGN(8); \
159 __start_ftrace_events = .; \
160 KEEP(*(_ftrace_events)) \
161 __stop_ftrace_events = .; \
162 __start_ftrace_eval_maps = .; \
163 KEEP(*(_ftrace_eval_map)) \
164 __stop_ftrace_eval_maps = .;
165 #else
166 #define FTRACE_EVENTS()
167 #endif
169 #ifdef CONFIG_TRACING
170 #define TRACE_PRINTKS() __start___trace_bprintk_fmt = .; \
172 __stop___trace_bprintk_fmt = .;
173 #define TRACEPOINT_STR() __start___tracepoint_str = .; \
175 __stop___tracepoint_str = .;
176 #else
177 #define TRACE_PRINTKS()
178 #define TRACEPOINT_STR()
179 #endif
181 #ifdef CONFIG_FTRACE_SYSCALLS
182 #define TRACE_SYSCALLS() . = ALIGN(8); \
183 __start_syscalls_metadata = .; \
184 KEEP(*(__syscalls_metadata)) \
185 __stop_syscalls_metadata = .;
186 #else
187 #define TRACE_SYSCALLS()
188 #endif
190 #ifdef CONFIG_BPF_EVENTS
191 #define BPF_RAW_TP() STRUCT_ALIGN(); \
192 __start__bpf_raw_tp = .; \
193 KEEP(*(__bpf_raw_tp_map)) \
194 __stop__bpf_raw_tp = .;
195 #else
196 #define BPF_RAW_TP()
197 #endif
199 #ifdef CONFIG_SERIAL_EARLYCON
200 #define EARLYCON_TABLE() . = ALIGN(8); \
201 __earlycon_table = .; \
202 KEEP(*(__earlycon_table)) \
203 __earlycon_table_end = .;
204 #else
205 #define EARLYCON_TABLE()
206 #endif
208 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name)
209 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name)
210 #define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name)
211 #define _OF_TABLE_0(name)
212 #define _OF_TABLE_1(name) \
213 . = ALIGN(8); \
214 __##name##_of_table = .; \
215 KEEP(*(__##name##_of_table)) \
216 KEEP(*(__##name##_of_table_end))
218 #define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer)
219 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
220 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk)
221 #define IOMMU_OF_TABLES() OF_TABLE(CONFIG_OF_IOMMU, iommu)
222 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
223 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method)
224 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method)
226 #ifdef CONFIG_ACPI
227 #define ACPI_PROBE_TABLE(name) \
228 . = ALIGN(8); \
229 __##name##_acpi_probe_table = .; \
230 KEEP(*(__##name##_acpi_probe_table)) \
231 __##name##_acpi_probe_table_end = .;
232 #else
233 #define ACPI_PROBE_TABLE(name)
234 #endif
236 #define KERNEL_DTB() \
237 STRUCT_ALIGN(); \
238 __dtb_start = .; \
239 KEEP(*(.dtb.init.rodata)) \
240 __dtb_end = .;
242 /*
243 * .data section
244 */
245 #define DATA_DATA \
246 *(.xiptext) \
247 *(DATA_MAIN) \
248 *(.ref.data) \
250 MEM_KEEP(init.data*) \
251 MEM_KEEP(exit.data*) \
252 *(.data.unlikely) \
253 __start_once = .; \
254 *(.data.once) \
255 __end_once = .; \
256 STRUCT_ALIGN(); \
257 *(__tracepoints) \
259 . = ALIGN(8); \
260 __start___jump_table = .; \
261 KEEP(*(__jump_table)) \
262 __stop___jump_table = .; \
263 . = ALIGN(8); \
264 __start___verbose = .; \
265 KEEP(*(__verbose)) \
266 __stop___verbose = .; \
267 LIKELY_PROFILE() \
268 BRANCH_PROFILE() \
269 TRACE_PRINTKS() \
270 BPF_RAW_TP() \
271 TRACEPOINT_STR()
273 /*
274 * Data section helpers
275 */
276 #define NOSAVE_DATA \
277 . = ALIGN(PAGE_SIZE); \
278 __nosave_begin = .; \
279 *(.data..nosave) \
280 . = ALIGN(PAGE_SIZE); \
281 __nosave_end = .;
283 #define PAGE_ALIGNED_DATA(page_align) \
284 . = ALIGN(page_align); \
285 *(.data..page_aligned)
287 #define READ_MOSTLY_DATA(align) \
288 . = ALIGN(align); \
289 *(.data..read_mostly) \
290 . = ALIGN(align);
292 #define CACHELINE_ALIGNED_DATA(align) \
293 . = ALIGN(align); \
294 *(.data..cacheline_aligned)
296 #define INIT_TASK_DATA(align) \
297 . = ALIGN(align); \
298 __start_init_task = .; \
299 init_thread_union = .; \
300 init_stack = .; \
301 KEEP(*(.data..init_task)) \
302 KEEP(*(.data..init_thread_info)) \
303 . = __start_init_task + THREAD_SIZE; \
304 __end_init_task = .;
306 /*
307 * Allow architectures to handle ro_after_init data on their
308 * own by defining an empty RO_AFTER_INIT_DATA.
309 */
310 #ifndef RO_AFTER_INIT_DATA
311 #define RO_AFTER_INIT_DATA \
312 __start_ro_after_init = .; \
313 *(.data..ro_after_init) \
314 __end_ro_after_init = .;
315 #endif
317 /*
318 * Read only Data
319 */
320 #define RO_DATA_SECTION(align) \
321 . = ALIGN((align)); \
322 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
323 __start_rodata = .; \
324 *(.rodata) *(.rodata.*) \
327 . = ALIGN(8); \
328 __start___tracepoints_ptrs = .; \
330 __stop___tracepoints_ptrs = .; \
332 } \
333 \
334 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \
335 *(.rodata1) \
336 } \
337 \
339 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \
340 __start_pci_fixups_early = .; \
341 KEEP(*(.pci_fixup_early)) \
342 __end_pci_fixups_early = .; \
343 __start_pci_fixups_header = .; \
344 KEEP(*(.pci_fixup_header)) \
345 __end_pci_fixups_header = .; \
346 __start_pci_fixups_final = .; \
347 KEEP(*(.pci_fixup_final)) \
348 __end_pci_fixups_final = .; \
349 __start_pci_fixups_enable = .; \
350 KEEP(*(.pci_fixup_enable)) \
351 __end_pci_fixups_enable = .; \
352 __start_pci_fixups_resume = .; \
353 KEEP(*(.pci_fixup_resume)) \
354 __end_pci_fixups_resume = .; \
355 __start_pci_fixups_resume_early = .; \
356 KEEP(*(.pci_fixup_resume_early)) \
357 __end_pci_fixups_resume_early = .; \
358 __start_pci_fixups_suspend = .; \
359 KEEP(*(.pci_fixup_suspend)) \
360 __end_pci_fixups_suspend = .; \
361 __start_pci_fixups_suspend_late = .; \
362 KEEP(*(.pci_fixup_suspend_late)) \
363 __end_pci_fixups_suspend_late = .; \
364 } \
365 \
367 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \
368 __start_builtin_fw = .; \
369 KEEP(*(.builtin_fw)) \
370 __end_builtin_fw = .; \
371 } \
372 \
373 TRACEDATA \
374 \
376 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \
377 __start___ksymtab = .; \
378 KEEP(*(SORT(___ksymtab+*))) \
379 __stop___ksymtab = .; \
380 } \
381 \
383 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \
384 __start___ksymtab_gpl = .; \
385 KEEP(*(SORT(___ksymtab_gpl+*))) \
386 __stop___ksymtab_gpl = .; \
387 } \
388 \
390 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \
391 __start___ksymtab_unused = .; \
392 KEEP(*(SORT(___ksymtab_unused+*))) \
393 __stop___ksymtab_unused = .; \
394 } \
395 \
397 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
398 __start___ksymtab_unused_gpl = .; \
399 KEEP(*(SORT(___ksymtab_unused_gpl+*))) \
400 __stop___ksymtab_unused_gpl = .; \
401 } \
402 \
404 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
405 __start___ksymtab_gpl_future = .; \
406 KEEP(*(SORT(___ksymtab_gpl_future+*))) \
407 __stop___ksymtab_gpl_future = .; \
408 } \
409 \
411 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \
412 __start___kcrctab = .; \
413 KEEP(*(SORT(___kcrctab+*))) \
414 __stop___kcrctab = .; \
415 } \
416 \
418 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \
419 __start___kcrctab_gpl = .; \
420 KEEP(*(SORT(___kcrctab_gpl+*))) \
421 __stop___kcrctab_gpl = .; \
422 } \
423 \
425 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \
426 __start___kcrctab_unused = .; \
427 KEEP(*(SORT(___kcrctab_unused+*))) \
428 __stop___kcrctab_unused = .; \
429 } \
430 \
432 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
433 __start___kcrctab_unused_gpl = .; \
434 KEEP(*(SORT(___kcrctab_unused_gpl+*))) \
435 __stop___kcrctab_unused_gpl = .; \
436 } \
437 \
439 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
440 __start___kcrctab_gpl_future = .; \
441 KEEP(*(SORT(___kcrctab_gpl_future+*))) \
442 __stop___kcrctab_gpl_future = .; \
443 } \
444 \
446 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
447 *(__ksymtab_strings) \
448 } \
449 \
451 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \
452 *(.ref.rodata) \
453 MEM_KEEP(init.rodata) \
454 MEM_KEEP(exit.rodata) \
455 } \
456 \
458 __param : AT(ADDR(__param) - LOAD_OFFSET) { \
459 __start___param = .; \
460 KEEP(*(__param)) \
461 __stop___param = .; \
462 } \
463 \
465 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \
466 __start___modver = .; \
467 KEEP(*(__modver)) \
468 __stop___modver = .; \
469 . = ALIGN((align)); \
470 __end_rodata = .; \
471 } \
472 . = ALIGN((align));
474 /* RODATA & RO_DATA provided for backward compatibility.
475 * All archs are supposed to use RO_DATA() */
476 #define RODATA RO_DATA_SECTION(4096)
477 #define RO_DATA(align) RO_DATA_SECTION(align)
479 #define SECURITY_INIT \
480 .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
481 __security_initcall_start = .; \
482 KEEP(*(.security_initcall.init)) \
483 __security_initcall_end = .; \
484 }
486 /*
487 * .text section. Map to function alignment to avoid address changes
488 * during second ld run in second ld pass when generating System.map
489 *
490 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead
491 * code elimination is enabled, so these sections should be converted
492 * to use ".." first.
493 */
494 #define TEXT_TEXT \
495 ALIGN_FUNCTION(); \
496 *(.text.hot TEXT_MAIN .text.fixup .text.unlikely) \
497 *(.text..refcount) \
498 *(.ref.text) \
499 MEM_KEEP(init.text*) \
500 MEM_KEEP(exit.text*) \
503 /* sched.text is aling to function alignment to secure we have same
504 * address even at second ld pass when generating System.map */
505 #define SCHED_TEXT \
506 ALIGN_FUNCTION(); \
507 __sched_text_start = .; \
508 *(.sched.text) \
509 __sched_text_end = .;
511 /* spinlock.text is aling to function alignment to secure we have same
512 * address even at second ld pass when generating System.map */
513 #define LOCK_TEXT \
514 ALIGN_FUNCTION(); \
515 __lock_text_start = .; \
516 *(.spinlock.text) \
517 __lock_text_end = .;
519 #define CPUIDLE_TEXT \
520 ALIGN_FUNCTION(); \
521 __cpuidle_text_start = .; \
522 *(.cpuidle.text) \
523 __cpuidle_text_end = .;
525 #define KPROBES_TEXT \
526 ALIGN_FUNCTION(); \
527 __kprobes_text_start = .; \
528 *(.kprobes.text) \
529 __kprobes_text_end = .;
531 #define ENTRY_TEXT \
532 ALIGN_FUNCTION(); \
533 __entry_text_start = .; \
534 *(.entry.text) \
535 __entry_text_end = .;
537 #define IRQENTRY_TEXT \
538 ALIGN_FUNCTION(); \
539 __irqentry_text_start = .; \
540 *(.irqentry.text) \
541 __irqentry_text_end = .;
543 #define SOFTIRQENTRY_TEXT \
544 ALIGN_FUNCTION(); \
545 __softirqentry_text_start = .; \
546 *(.softirqentry.text) \
547 __softirqentry_text_end = .;
549 /* Section used for early init (in .S files) */
550 #define HEAD_TEXT KEEP(*(.head.text))
552 #define HEAD_TEXT_SECTION \
553 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \
554 HEAD_TEXT \
555 }
557 /*
558 * Exception table
559 */
560 #define EXCEPTION_TABLE(align) \
561 . = ALIGN(align); \
562 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \
563 __start___ex_table = .; \
564 KEEP(*(__ex_table)) \
565 __stop___ex_table = .; \
566 }
568 /*
569 * Init task
570 */
571 #define INIT_TASK_DATA_SECTION(align) \
572 . = ALIGN(align); \
573 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \
574 INIT_TASK_DATA(align) \
575 }
577 #ifdef CONFIG_CONSTRUCTORS
578 #define KERNEL_CTORS() . = ALIGN(8); \
579 __ctors_start = .; \
580 KEEP(*(.ctors)) \
581 KEEP(*(SORT(.init_array.*))) \
582 KEEP(*(.init_array)) \
583 __ctors_end = .;
584 #else
585 #define KERNEL_CTORS()
586 #endif
588 /* init and exit section handling */
589 #define INIT_DATA \
590 KEEP(*(SORT(___kentry+*))) \
591 *(.init.data init.data.*) \
592 MEM_DISCARD(init.data*) \
593 KERNEL_CTORS() \
594 MCOUNT_REC() \
595 *(.init.rodata .init.rodata.*) \
596 FTRACE_EVENTS() \
597 TRACE_SYSCALLS() \
598 KPROBE_BLACKLIST() \
599 ERROR_INJECT_WHITELIST() \
600 MEM_DISCARD(init.rodata) \
601 CLK_OF_TABLES() \
602 RESERVEDMEM_OF_TABLES() \
603 TIMER_OF_TABLES() \
604 IOMMU_OF_TABLES() \
605 CPU_METHOD_OF_TABLES() \
606 CPUIDLE_METHOD_OF_TABLES() \
607 KERNEL_DTB() \
608 IRQCHIP_OF_MATCH_TABLE() \
609 ACPI_PROBE_TABLE(irqchip) \
610 ACPI_PROBE_TABLE(timer) \
611 EARLYCON_TABLE()
613 #define INIT_TEXT \
614 *(.init.text .init.text.*) \
615 *(.text.startup) \
616 MEM_DISCARD(init.text*)
618 #define EXIT_DATA \
619 *(.exit.data .exit.data.*) \
620 *(.fini_array) \
621 *(.dtors) \
622 MEM_DISCARD(exit.data*) \
623 MEM_DISCARD(exit.rodata*)
625 #define EXIT_TEXT \
626 *(.exit.text) \
627 *(.text.exit) \
628 MEM_DISCARD(exit.text)
630 #define EXIT_CALL \
631 *(.exitcall.exit)
633 /*
634 * bss (Block Started by Symbol) - uninitialized data
635 * zeroed during startup
636 */
637 #define SBSS(sbss_align) \
638 . = ALIGN(sbss_align); \
639 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \
640 *(.dynsbss) \
641 *(SBSS_MAIN) \
642 *(.scommon) \
643 }
645 /*
646 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
647 * sections to the front of bss.
648 */
649 #ifndef BSS_FIRST_SECTIONS
650 #define BSS_FIRST_SECTIONS
651 #endif
653 #define BSS(bss_align) \
654 . = ALIGN(bss_align); \
655 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \
656 BSS_FIRST_SECTIONS \
657 *(.bss..page_aligned) \
658 *(.dynbss) \
659 *(BSS_MAIN) \
660 *(COMMON) \
661 }
663 /*
664 * DWARF debug sections.
665 * Symbols in the DWARF debugging sections are relative to
666 * the beginning of the section so we begin them at 0.
667 */
668 #define DWARF_DEBUG \
670 .debug 0 : { *(.debug) } \
671 .line 0 : { *(.line) } \
673 .debug_srcinfo 0 : { *(.debug_srcinfo) } \
674 .debug_sfnames 0 : { *(.debug_sfnames) } \
676 .debug_aranges 0 : { *(.debug_aranges) } \
677 .debug_pubnames 0 : { *(.debug_pubnames) } \
679 .debug_info 0 : { *(.debug_info \
680 .gnu.linkonce.wi.*) } \
681 .debug_abbrev 0 : { *(.debug_abbrev) } \
682 .debug_line 0 : { *(.debug_line) } \
683 .debug_frame 0 : { *(.debug_frame) } \
684 .debug_str 0 : { *(.debug_str) } \
685 .debug_loc 0 : { *(.debug_loc) } \
686 .debug_macinfo 0 : { *(.debug_macinfo) } \
687 .debug_pubtypes 0 : { *(.debug_pubtypes) } \
689 .debug_ranges 0 : { *(.debug_ranges) } \
691 .debug_weaknames 0 : { *(.debug_weaknames) } \
692 .debug_funcnames 0 : { *(.debug_funcnames) } \
693 .debug_typenames 0 : { *(.debug_typenames) } \
694 .debug_varnames 0 : { *(.debug_varnames) } \
696 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \
697 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \
699 .debug_types 0 : { *(.debug_types) } \
701 .debug_macro 0 : { *(.debug_macro) } \
702 .debug_addr 0 : { *(.debug_addr) }
704 /* Stabs debugging sections. */
705 #define STABS_DEBUG \
706 .stab 0 : { *(.stab) } \
707 .stabstr 0 : { *(.stabstr) } \
708 .stab.excl 0 : { *(.stab.excl) } \
709 .stab.exclstr 0 : { *(.stab.exclstr) } \
710 .stab.index 0 : { *(.stab.index) } \
711 .stab.indexstr 0 : { *(.stab.indexstr) } \
712 .comment 0 : { *(.comment) }
714 #ifdef CONFIG_GENERIC_BUG
715 #define BUG_TABLE \
716 . = ALIGN(8); \
717 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \
718 __start___bug_table = .; \
719 KEEP(*(__bug_table)) \
720 __stop___bug_table = .; \
721 }
722 #else
723 #define BUG_TABLE
724 #endif
726 #ifdef CONFIG_UNWINDER_ORC
727 #define ORC_UNWIND_TABLE \
728 . = ALIGN(4); \
729 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \
730 __start_orc_unwind_ip = .; \
731 KEEP(*(.orc_unwind_ip)) \
732 __stop_orc_unwind_ip = .; \
733 } \
734 . = ALIGN(6); \
735 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \
736 __start_orc_unwind = .; \
737 KEEP(*(.orc_unwind)) \
738 __stop_orc_unwind = .; \
739 } \
740 . = ALIGN(4); \
741 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \
742 orc_lookup = .; \
743 . += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) / \
744 LOOKUP_BLOCK_SIZE) + 1) * 4; \
745 orc_lookup_end = .; \
746 }
747 #else
748 #define ORC_UNWIND_TABLE
749 #endif
751 #ifdef CONFIG_PM_TRACE
752 #define TRACEDATA \
753 . = ALIGN(4); \
754 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \
755 __tracedata_start = .; \
756 KEEP(*(.tracedata)) \
757 __tracedata_end = .; \
758 }
759 #else
760 #define TRACEDATA
761 #endif
763 #define NOTES \
764 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \
765 __start_notes = .; \
766 KEEP(*(.note.*)) \
767 __stop_notes = .; \
768 }
770 #define INIT_SETUP(initsetup_align) \
771 . = ALIGN(initsetup_align); \
772 __setup_start = .; \
773 KEEP(*(.init.setup)) \
774 __setup_end = .;
776 #define INIT_CALLS_LEVEL(level) \
777 __initcall##level##_start = .; \
778 KEEP(*(.initcall##level##.init)) \
779 KEEP(*(.initcall##level##s.init)) \
781 #define INIT_CALLS \
782 __initcall_start = .; \
783 KEEP(*(.initcallearly.init)) \
784 INIT_CALLS_LEVEL(0) \
785 INIT_CALLS_LEVEL(1) \
786 INIT_CALLS_LEVEL(2) \
787 INIT_CALLS_LEVEL(3) \
788 INIT_CALLS_LEVEL(4) \
789 INIT_CALLS_LEVEL(5) \
790 INIT_CALLS_LEVEL(rootfs) \
791 INIT_CALLS_LEVEL(6) \
792 INIT_CALLS_LEVEL(7) \
793 __initcall_end = .;
795 #define CON_INITCALL \
796 __con_initcall_start = .; \
797 KEEP(*(.con_initcall.init)) \
798 __con_initcall_end = .;
800 #define SECURITY_INITCALL \
801 __security_initcall_start = .; \
802 KEEP(*(.security_initcall.init)) \
803 __security_initcall_end = .;
805 #ifdef CONFIG_BLK_DEV_INITRD
806 #define INIT_RAM_FS \
807 . = ALIGN(4); \
808 __initramfs_start = .; \
809 KEEP(*(.init.ramfs)) \
810 . = ALIGN(8); \
811 KEEP(*(.init.ramfs.info))
812 #else
813 #define INIT_RAM_FS
814 #endif
816 /*
817 * Memory encryption operates on a page basis. Since we need to clear
818 * the memory encryption mask for this section, it needs to be aligned
819 * on a page boundary and be a page-size multiple in length.
820 *
821 * Note: We use a separate section so that only this section gets
822 * decrypted to avoid exposing more than we wish.
823 */
824 #ifdef CONFIG_AMD_MEM_ENCRYPT
825 #define PERCPU_DECRYPTED_SECTION \
826 . = ALIGN(PAGE_SIZE); \
827 *(.data..percpu..decrypted) \
828 . = ALIGN(PAGE_SIZE);
829 #else
830 #define PERCPU_DECRYPTED_SECTION
831 #endif
834 /*
835 * Default discarded sections.
836 *
837 * Some archs want to discard exit text/data at runtime rather than
838 * link time due to cross-section references such as alt instructions,
839 * bug table, eh_frame, etc. DISCARDS must be the last of output
840 * section definitions so that such archs put those in earlier section
841 * definitions.
842 */
843 #define DISCARDS \
844 /DISCARD/ : { \
845 EXIT_TEXT \
846 EXIT_DATA \
847 EXIT_CALL \
848 *(.discard) \
849 *(.discard.*) \
850 }
852 /**
853 * PERCPU_INPUT - the percpu input sections
854 * @cacheline: cacheline size
855 *
856 * The core percpu section names and core symbols which do not rely
857 * directly upon load addresses.
858 *
859 * @cacheline is used to align subsections to avoid false cacheline
860 * sharing between subsections for different purposes.
861 */
862 #define PERCPU_INPUT(cacheline) \
863 __per_cpu_start = .; \
864 *(.data..percpu..first) \
865 . = ALIGN(PAGE_SIZE); \
866 *(.data..percpu..page_aligned) \
867 . = ALIGN(cacheline); \
868 *(.data..percpu..read_mostly) \
869 . = ALIGN(cacheline); \
870 *(.data..percpu) \
871 *(.data..percpu..shared_aligned) \
872 PERCPU_DECRYPTED_SECTION \
873 __per_cpu_end = .;
875 /**
876 * PERCPU_VADDR - define output section for percpu area
877 * @cacheline: cacheline size
878 * @vaddr: explicit base address (optional)
879 * @phdr: destination PHDR (optional)
880 *
881 * Macro which expands to output section for percpu area.
882 *
883 * @cacheline is used to align subsections to avoid false cacheline
884 * sharing between subsections for different purposes.
885 *
886 * If @vaddr is not blank, it specifies explicit base address and all
887 * percpu symbols will be offset from the given address. If blank,
888 * @vaddr always equals @laddr + LOAD_OFFSET.
889 *
890 * @phdr defines the output PHDR to use if not blank. Be warned that
891 * output PHDR is sticky. If @phdr is specified, the next output
892 * section in the linker script will go there too. @phdr should have
893 * a leading colon.
894 *
895 * Note that this macros defines __per_cpu_load as an absolute symbol.
896 * If there is no need to put the percpu section at a predetermined
897 * address, use PERCPU_SECTION.
898 */
899 #define PERCPU_VADDR(cacheline, vaddr, phdr) \
900 __per_cpu_load = .; \
901 .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \
902 PERCPU_INPUT(cacheline) \
903 } phdr \
904 . = __per_cpu_load + SIZEOF(.data..percpu);
906 /**
907 * PERCPU_SECTION - define output section for percpu area, simple version
908 * @cacheline: cacheline size
909 *
910 * Align to PAGE_SIZE and outputs output section for percpu area. This
911 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
912 * __per_cpu_start will be identical.
913 *
914 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
915 * except that __per_cpu_load is defined as a relative symbol against
916 * .data..percpu which is required for relocatable x86_32 configuration.
917 */
918 #define PERCPU_SECTION(cacheline) \
919 . = ALIGN(PAGE_SIZE); \
920 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \
921 __per_cpu_load = .; \
922 PERCPU_INPUT(cacheline) \
923 }
926 /*
927 * Definition of the high level *_SECTION macros
928 * They will fit only a subset of the architectures
929 */
932 /*
933 * Writeable data.
934 * All sections are combined in a single .data section.
935 * The sections following CONSTRUCTORS are arranged so their
936 * typical alignment matches.
937 * A cacheline is typical/always less than a PAGE_SIZE so
938 * the sections that has this restriction (or similar)
939 * is located before the ones requiring PAGE_SIZE alignment.
940 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
941 * matches the requirement of PAGE_ALIGNED_DATA.
942 *
943 * use 0 as page_align if page_aligned data is not used */
944 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \
945 . = ALIGN(PAGE_SIZE); \
946 .data : AT(ADDR(.data) - LOAD_OFFSET) { \
947 INIT_TASK_DATA(inittask) \
948 NOSAVE_DATA \
949 PAGE_ALIGNED_DATA(pagealigned) \
950 CACHELINE_ALIGNED_DATA(cacheline) \
951 READ_MOSTLY_DATA(cacheline) \
952 DATA_DATA \
953 CONSTRUCTORS \
954 } \
955 BUG_TABLE \
957 #define INIT_TEXT_SECTION(inittext_align) \
958 . = ALIGN(inittext_align); \
959 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \
960 _sinittext = .; \
961 INIT_TEXT \
962 _einittext = .; \
963 }
965 #define INIT_DATA_SECTION(initsetup_align) \
966 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \
967 INIT_DATA \
968 INIT_SETUP(initsetup_align) \
969 INIT_CALLS \
970 CON_INITCALL \
971 SECURITY_INITCALL \
972 INIT_RAM_FS \
973 }
975 #define BSS_SECTION(sbss_align, bss_align, stop_align) \
976 . = ALIGN(sbss_align); \
977 __bss_start = .; \
978 SBSS(sbss_align) \
979 BSS(bss_align) \
980 . = ALIGN(stop_align); \
981 __bss_stop = .;