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1 | /* |
2 | * Helper macros to support writing architecture specific |
3 | * linker scripts. |
4 | * |
5 | * A minimal linker scripts has following content: |
6 | * [This is a sample, architectures may have special requiriements] |
7 | * |
8 | * OUTPUT_FORMAT(...) |
9 | * OUTPUT_ARCH(...) |
10 | * ENTRY(...) |
11 | * SECTIONS |
12 | * { |
13 | * . = START; |
14 | * __init_begin = .; |
15 | * HEAD_TEXT_SECTION |
16 | * INIT_TEXT_SECTION(PAGE_SIZE) |
17 | * INIT_DATA_SECTION(...) |
18 | * PERCPU(PAGE_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 | * [_stext, _etext] is the text section |
44 | * [_sdata, _edata] is the data section |
45 | * |
46 | * Some of the included output section have their own set of constants. |
47 | * Examples are: [__initramfs_start, __initramfs_end] for initramfs and |
48 | * [__nosave_begin, __nosave_end] for the nosave data |
49 | */ |
50 | |
51 | #ifndef LOAD_OFFSET |
52 | #define LOAD_OFFSET 0 |
53 | #endif |
54 | |
55 | #ifndef SYMTAB_KEEP_STR |
56 | #define SYMTAB_KEEP_STR *(__ksymtab_strings.*) |
57 | #define SYMTAB_DISCARD_STR |
58 | #else |
59 | #define SYMTAB_DISCARD_STR *(__ksymtab_strings.*) |
60 | #endif |
61 | |
62 | #ifndef SYMTAB_KEEP |
63 | #define SYMTAB_KEEP *(__ksymtab.*) |
64 | #define SYMTAB_DISCARD |
65 | #else |
66 | #define SYMTAB_DISCARD *(__ksymtab.*) |
67 | #endif |
68 | |
69 | #ifndef SYMTAB_KEEP_GPL |
70 | #define SYMTAB_KEEP_GPL *(__ksymtab_gpl.*) |
71 | #define SYMTAB_DISCARD_GPL |
72 | #else |
73 | #define SYMTAB_DISCARD_GPL *(__ksymtab_gpl.*) |
74 | #endif |
75 | |
76 | #ifndef VMLINUX_SYMBOL |
77 | #define VMLINUX_SYMBOL(_sym_) _sym_ |
78 | #endif |
79 | |
80 | /* Align . to a 8 byte boundary equals to maximum function alignment. */ |
81 | #define ALIGN_FUNCTION() . = ALIGN(8) |
82 | |
83 | /* The actual configuration determine if the init/exit sections |
84 | * are handled as text/data or they can be discarded (which |
85 | * often happens at runtime) |
86 | */ |
87 | #ifdef CONFIG_HOTPLUG |
88 | #define DEV_KEEP(sec) *(.dev##sec) |
89 | #define DEV_DISCARD(sec) |
90 | #else |
91 | #define DEV_KEEP(sec) |
92 | #define DEV_DISCARD(sec) *(.dev##sec) |
93 | #endif |
94 | |
95 | #ifdef CONFIG_HOTPLUG_CPU |
96 | #define CPU_KEEP(sec) *(.cpu##sec) |
97 | #define CPU_DISCARD(sec) |
98 | #else |
99 | #define CPU_KEEP(sec) |
100 | #define CPU_DISCARD(sec) *(.cpu##sec) |
101 | #endif |
102 | |
103 | #if defined(CONFIG_MEMORY_HOTPLUG) |
104 | #define MEM_KEEP(sec) *(.mem##sec) |
105 | #define MEM_DISCARD(sec) |
106 | #else |
107 | #define MEM_KEEP(sec) |
108 | #define MEM_DISCARD(sec) *(.mem##sec) |
109 | #endif |
110 | |
111 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
112 | #define MCOUNT_REC() . = ALIGN(8); \ |
113 | VMLINUX_SYMBOL(__start_mcount_loc) = .; \ |
114 | *(__mcount_loc) \ |
115 | VMLINUX_SYMBOL(__stop_mcount_loc) = .; |
116 | #else |
117 | #define MCOUNT_REC() |
118 | #endif |
119 | |
120 | #ifdef CONFIG_TRACE_BRANCH_PROFILING |
121 | #define LIKELY_PROFILE() VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \ |
122 | *(_ftrace_annotated_branch) \ |
123 | VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .; |
124 | #else |
125 | #define LIKELY_PROFILE() |
126 | #endif |
127 | |
128 | #ifdef CONFIG_PROFILE_ALL_BRANCHES |
129 | #define BRANCH_PROFILE() VMLINUX_SYMBOL(__start_branch_profile) = .; \ |
130 | *(_ftrace_branch) \ |
131 | VMLINUX_SYMBOL(__stop_branch_profile) = .; |
132 | #else |
133 | #define BRANCH_PROFILE() |
134 | #endif |
135 | |
136 | #ifdef CONFIG_EVENT_TRACING |
137 | #define FTRACE_EVENTS() VMLINUX_SYMBOL(__start_ftrace_events) = .; \ |
138 | *(_ftrace_events) \ |
139 | VMLINUX_SYMBOL(__stop_ftrace_events) = .; |
140 | #else |
141 | #define FTRACE_EVENTS() |
142 | #endif |
143 | |
144 | #ifdef CONFIG_TRACING |
145 | #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .; \ |
146 | *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \ |
147 | VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .; |
148 | #else |
149 | #define TRACE_PRINTKS() |
150 | #endif |
151 | |
152 | #ifdef CONFIG_FTRACE_SYSCALLS |
153 | #define TRACE_SYSCALLS() VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \ |
154 | *(__syscalls_metadata) \ |
155 | VMLINUX_SYMBOL(__stop_syscalls_metadata) = .; |
156 | #else |
157 | #define TRACE_SYSCALLS() |
158 | #endif |
159 | |
160 | /* .data section */ |
161 | #define DATA_DATA \ |
162 | *(.data) \ |
163 | *(.ref.data) \ |
164 | DEV_KEEP(init.data) \ |
165 | DEV_KEEP(exit.data) \ |
166 | CPU_KEEP(init.data) \ |
167 | CPU_KEEP(exit.data) \ |
168 | MEM_KEEP(init.data) \ |
169 | MEM_KEEP(exit.data) \ |
170 | . = ALIGN(8); \ |
171 | VMLINUX_SYMBOL(__start___markers) = .; \ |
172 | *(__markers) \ |
173 | VMLINUX_SYMBOL(__stop___markers) = .; \ |
174 | . = ALIGN(32); \ |
175 | VMLINUX_SYMBOL(__start___tracepoints) = .; \ |
176 | *(__tracepoints) \ |
177 | VMLINUX_SYMBOL(__stop___tracepoints) = .; \ |
178 | /* implement dynamic printk debug */ \ |
179 | . = ALIGN(8); \ |
180 | VMLINUX_SYMBOL(__start___verbose) = .; \ |
181 | *(__verbose) \ |
182 | VMLINUX_SYMBOL(__stop___verbose) = .; \ |
183 | LIKELY_PROFILE() \ |
184 | BRANCH_PROFILE() \ |
185 | TRACE_PRINTKS() \ |
186 | FTRACE_EVENTS() \ |
187 | TRACE_SYSCALLS() |
188 | |
189 | /* |
190 | * Data section helpers |
191 | */ |
192 | #define NOSAVE_DATA \ |
193 | . = ALIGN(PAGE_SIZE); \ |
194 | VMLINUX_SYMBOL(__nosave_begin) = .; \ |
195 | *(.data.nosave) \ |
196 | . = ALIGN(PAGE_SIZE); \ |
197 | VMLINUX_SYMBOL(__nosave_end) = .; |
198 | |
199 | #define PAGE_ALIGNED_DATA(page_align) \ |
200 | . = ALIGN(page_align); \ |
201 | *(.data.page_aligned) |
202 | |
203 | #define READ_MOSTLY_DATA(align) \ |
204 | . = ALIGN(align); \ |
205 | *(.data.read_mostly) |
206 | |
207 | #define CACHELINE_ALIGNED_DATA(align) \ |
208 | . = ALIGN(align); \ |
209 | *(.data.cacheline_aligned) |
210 | |
211 | #define INIT_TASK_DATA(align) \ |
212 | . = ALIGN(align); \ |
213 | *(.data.init_task) |
214 | |
215 | /* |
216 | * Read only Data |
217 | */ |
218 | #define RO_DATA_SECTION(align) \ |
219 | . = ALIGN((align)); \ |
220 | .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ |
221 | VMLINUX_SYMBOL(__start_rodata) = .; \ |
222 | *(.rodata) *(.rodata.*) \ |
223 | *(__vermagic) /* Kernel version magic */ \ |
224 | *(__markers_strings) /* Markers: strings */ \ |
225 | *(__tracepoints_strings)/* Tracepoints: strings */ \ |
226 | } \ |
227 | \ |
228 | .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ |
229 | *(.rodata1) \ |
230 | } \ |
231 | \ |
232 | BUG_TABLE \ |
233 | \ |
234 | /* PCI quirks */ \ |
235 | .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ |
236 | VMLINUX_SYMBOL(__start_pci_fixups_early) = .; \ |
237 | *(.pci_fixup_early) \ |
238 | VMLINUX_SYMBOL(__end_pci_fixups_early) = .; \ |
239 | VMLINUX_SYMBOL(__start_pci_fixups_header) = .; \ |
240 | *(.pci_fixup_header) \ |
241 | VMLINUX_SYMBOL(__end_pci_fixups_header) = .; \ |
242 | VMLINUX_SYMBOL(__start_pci_fixups_final) = .; \ |
243 | *(.pci_fixup_final) \ |
244 | VMLINUX_SYMBOL(__end_pci_fixups_final) = .; \ |
245 | VMLINUX_SYMBOL(__start_pci_fixups_enable) = .; \ |
246 | *(.pci_fixup_enable) \ |
247 | VMLINUX_SYMBOL(__end_pci_fixups_enable) = .; \ |
248 | VMLINUX_SYMBOL(__start_pci_fixups_resume) = .; \ |
249 | *(.pci_fixup_resume) \ |
250 | VMLINUX_SYMBOL(__end_pci_fixups_resume) = .; \ |
251 | VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .; \ |
252 | *(.pci_fixup_resume_early) \ |
253 | VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .; \ |
254 | VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .; \ |
255 | *(.pci_fixup_suspend) \ |
256 | VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .; \ |
257 | } \ |
258 | \ |
259 | /* Built-in firmware blobs */ \ |
260 | .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \ |
261 | VMLINUX_SYMBOL(__start_builtin_fw) = .; \ |
262 | *(.builtin_fw) \ |
263 | VMLINUX_SYMBOL(__end_builtin_fw) = .; \ |
264 | } \ |
265 | \ |
266 | /* RapidIO route ops */ \ |
267 | .rio_route : AT(ADDR(.rio_route) - LOAD_OFFSET) { \ |
268 | VMLINUX_SYMBOL(__start_rio_route_ops) = .; \ |
269 | *(.rio_route_ops) \ |
270 | VMLINUX_SYMBOL(__end_rio_route_ops) = .; \ |
271 | } \ |
272 | \ |
273 | TRACEDATA \ |
274 | \ |
275 | /* Kernel symbol table: Normal symbols */ \ |
276 | __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ |
277 | VMLINUX_SYMBOL(__start___ksymtab) = .; \ |
278 | SYMTAB_KEEP \ |
279 | VMLINUX_SYMBOL(__stop___ksymtab) = .; \ |
280 | } \ |
281 | \ |
282 | /* Kernel symbol table: GPL-only symbols */ \ |
283 | __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ |
284 | VMLINUX_SYMBOL(__start___ksymtab_gpl) = .; \ |
285 | SYMTAB_KEEP_GPL \ |
286 | VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .; \ |
287 | } \ |
288 | \ |
289 | /* Kernel symbol table: Normal unused symbols */ \ |
290 | __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \ |
291 | VMLINUX_SYMBOL(__start___ksymtab_unused) = .; \ |
292 | *(__ksymtab_unused.*) \ |
293 | VMLINUX_SYMBOL(__stop___ksymtab_unused) = .; \ |
294 | } \ |
295 | \ |
296 | /* Kernel symbol table: GPL-only unused symbols */ \ |
297 | __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \ |
298 | VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .; \ |
299 | *(__ksymtab_unused_gpl.*) \ |
300 | VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .; \ |
301 | } \ |
302 | \ |
303 | /* Kernel symbol table: GPL-future-only symbols */ \ |
304 | __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \ |
305 | VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .; \ |
306 | *(__ksymtab_gpl_future.*) \ |
307 | VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .; \ |
308 | } \ |
309 | \ |
310 | /* Kernel symbol table: Normal symbols */ \ |
311 | __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ |
312 | VMLINUX_SYMBOL(__start___kcrctab) = .; \ |
313 | *(__kcrctab) \ |
314 | VMLINUX_SYMBOL(__stop___kcrctab) = .; \ |
315 | } \ |
316 | \ |
317 | /* Kernel symbol table: GPL-only symbols */ \ |
318 | __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ |
319 | VMLINUX_SYMBOL(__start___kcrctab_gpl) = .; \ |
320 | *(__kcrctab_gpl) \ |
321 | VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .; \ |
322 | } \ |
323 | \ |
324 | /* Kernel symbol table: Normal unused symbols */ \ |
325 | __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \ |
326 | VMLINUX_SYMBOL(__start___kcrctab_unused) = .; \ |
327 | *(__kcrctab_unused) \ |
328 | VMLINUX_SYMBOL(__stop___kcrctab_unused) = .; \ |
329 | } \ |
330 | \ |
331 | /* Kernel symbol table: GPL-only unused symbols */ \ |
332 | __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \ |
333 | VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .; \ |
334 | *(__kcrctab_unused_gpl) \ |
335 | VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .; \ |
336 | } \ |
337 | \ |
338 | /* Kernel symbol table: GPL-future-only symbols */ \ |
339 | __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \ |
340 | VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .; \ |
341 | *(__kcrctab_gpl_future) \ |
342 | VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .; \ |
343 | } \ |
344 | \ |
345 | /* Kernel symbol table: strings */ \ |
346 | __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ |
347 | SYMTAB_KEEP_STR \ |
348 | } \ |
349 | \ |
350 | /* __*init sections */ \ |
351 | __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ |
352 | *(.ref.rodata) \ |
353 | DEV_KEEP(init.rodata) \ |
354 | DEV_KEEP(exit.rodata) \ |
355 | CPU_KEEP(init.rodata) \ |
356 | CPU_KEEP(exit.rodata) \ |
357 | MEM_KEEP(init.rodata) \ |
358 | MEM_KEEP(exit.rodata) \ |
359 | } \ |
360 | \ |
361 | /* Built-in module parameters. */ \ |
362 | __param : AT(ADDR(__param) - LOAD_OFFSET) { \ |
363 | VMLINUX_SYMBOL(__start___param) = .; \ |
364 | *(__param) \ |
365 | VMLINUX_SYMBOL(__stop___param) = .; \ |
366 | . = ALIGN((align)); \ |
367 | VMLINUX_SYMBOL(__end_rodata) = .; \ |
368 | } \ |
369 | . = ALIGN((align)); |
370 | |
371 | /* RODATA & RO_DATA provided for backward compatibility. |
372 | * All archs are supposed to use RO_DATA() */ |
373 | #define RODATA RO_DATA_SECTION(4096) |
374 | #define RO_DATA(align) RO_DATA_SECTION(align) |
375 | |
376 | #define SECURITY_INIT \ |
377 | .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \ |
378 | VMLINUX_SYMBOL(__security_initcall_start) = .; \ |
379 | *(.security_initcall.init) \ |
380 | VMLINUX_SYMBOL(__security_initcall_end) = .; \ |
381 | } |
382 | |
383 | /* .text section. Map to function alignment to avoid address changes |
384 | * during second ld run in second ld pass when generating System.map */ |
385 | #define TEXT_TEXT \ |
386 | ALIGN_FUNCTION(); \ |
387 | *(.text.hot) \ |
388 | *(.text) \ |
389 | *(.ref.text) \ |
390 | DEV_KEEP(init.text) \ |
391 | DEV_KEEP(exit.text) \ |
392 | CPU_KEEP(init.text) \ |
393 | CPU_KEEP(exit.text) \ |
394 | MEM_KEEP(init.text) \ |
395 | MEM_KEEP(exit.text) \ |
396 | *(.text.unlikely) |
397 | |
398 | |
399 | /* sched.text is aling to function alignment to secure we have same |
400 | * address even at second ld pass when generating System.map */ |
401 | #define SCHED_TEXT \ |
402 | ALIGN_FUNCTION(); \ |
403 | VMLINUX_SYMBOL(__sched_text_start) = .; \ |
404 | *(.sched.text) \ |
405 | VMLINUX_SYMBOL(__sched_text_end) = .; |
406 | |
407 | /* spinlock.text is aling to function alignment to secure we have same |
408 | * address even at second ld pass when generating System.map */ |
409 | #define LOCK_TEXT \ |
410 | ALIGN_FUNCTION(); \ |
411 | VMLINUX_SYMBOL(__lock_text_start) = .; \ |
412 | *(.spinlock.text) \ |
413 | VMLINUX_SYMBOL(__lock_text_end) = .; |
414 | |
415 | #define KPROBES_TEXT \ |
416 | ALIGN_FUNCTION(); \ |
417 | VMLINUX_SYMBOL(__kprobes_text_start) = .; \ |
418 | *(.kprobes.text) \ |
419 | VMLINUX_SYMBOL(__kprobes_text_end) = .; |
420 | |
421 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
422 | #define IRQENTRY_TEXT \ |
423 | ALIGN_FUNCTION(); \ |
424 | VMLINUX_SYMBOL(__irqentry_text_start) = .; \ |
425 | *(.irqentry.text) \ |
426 | VMLINUX_SYMBOL(__irqentry_text_end) = .; |
427 | #else |
428 | #define IRQENTRY_TEXT |
429 | #endif |
430 | |
431 | /* Section used for early init (in .S files) */ |
432 | #define HEAD_TEXT *(.head.text) |
433 | |
434 | #define HEAD_TEXT_SECTION \ |
435 | .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ |
436 | HEAD_TEXT \ |
437 | } |
438 | |
439 | /* |
440 | * Exception table |
441 | */ |
442 | #define EXCEPTION_TABLE(align) \ |
443 | . = ALIGN(align); \ |
444 | __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ |
445 | VMLINUX_SYMBOL(__start___ex_table) = .; \ |
446 | *(__ex_table) \ |
447 | VMLINUX_SYMBOL(__stop___ex_table) = .; \ |
448 | } |
449 | |
450 | /* |
451 | * Init task |
452 | */ |
453 | #define INIT_TASK_DATA_SECTION(align) \ |
454 | . = ALIGN(align); \ |
455 | .data.init_task : { \ |
456 | INIT_TASK_DATA(align) \ |
457 | } |
458 | |
459 | #ifdef CONFIG_CONSTRUCTORS |
460 | #define KERNEL_CTORS() . = ALIGN(8); \ |
461 | VMLINUX_SYMBOL(__ctors_start) = .; \ |
462 | *(.ctors) \ |
463 | VMLINUX_SYMBOL(__ctors_end) = .; |
464 | #else |
465 | #define KERNEL_CTORS() |
466 | #endif |
467 | |
468 | /* init and exit section handling */ |
469 | #define INIT_DATA \ |
470 | *(.init.data) \ |
471 | DEV_DISCARD(init.data) \ |
472 | CPU_DISCARD(init.data) \ |
473 | MEM_DISCARD(init.data) \ |
474 | KERNEL_CTORS() \ |
475 | *(.init.rodata) \ |
476 | MCOUNT_REC() \ |
477 | DEV_DISCARD(init.rodata) \ |
478 | CPU_DISCARD(init.rodata) \ |
479 | MEM_DISCARD(init.rodata) |
480 | |
481 | #define INIT_TEXT \ |
482 | *(.init.text) \ |
483 | DEV_DISCARD(init.text) \ |
484 | CPU_DISCARD(init.text) \ |
485 | MEM_DISCARD(init.text) |
486 | |
487 | #define EXIT_DATA \ |
488 | *(.exit.data) \ |
489 | DEV_DISCARD(exit.data) \ |
490 | DEV_DISCARD(exit.rodata) \ |
491 | CPU_DISCARD(exit.data) \ |
492 | CPU_DISCARD(exit.rodata) \ |
493 | MEM_DISCARD(exit.data) \ |
494 | MEM_DISCARD(exit.rodata) |
495 | |
496 | #define EXIT_TEXT \ |
497 | *(.exit.text) \ |
498 | DEV_DISCARD(exit.text) \ |
499 | CPU_DISCARD(exit.text) \ |
500 | MEM_DISCARD(exit.text) |
501 | |
502 | #define EXIT_CALL \ |
503 | *(.exitcall.exit) |
504 | |
505 | /* |
506 | * bss (Block Started by Symbol) - uninitialized data |
507 | * zeroed during startup |
508 | */ |
509 | #define SBSS(sbss_align) \ |
510 | . = ALIGN(sbss_align); \ |
511 | .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ |
512 | *(.sbss) \ |
513 | *(.scommon) \ |
514 | } |
515 | |
516 | #define BSS(bss_align) \ |
517 | . = ALIGN(bss_align); \ |
518 | .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ |
519 | *(.bss.page_aligned) \ |
520 | *(.dynbss) \ |
521 | *(.bss) \ |
522 | *(COMMON) \ |
523 | } |
524 | |
525 | /* |
526 | * DWARF debug sections. |
527 | * Symbols in the DWARF debugging sections are relative to |
528 | * the beginning of the section so we begin them at 0. |
529 | */ |
530 | #define DWARF_DEBUG \ |
531 | /* DWARF 1 */ \ |
532 | .debug 0 : { *(.debug) } \ |
533 | .line 0 : { *(.line) } \ |
534 | /* GNU DWARF 1 extensions */ \ |
535 | .debug_srcinfo 0 : { *(.debug_srcinfo) } \ |
536 | .debug_sfnames 0 : { *(.debug_sfnames) } \ |
537 | /* DWARF 1.1 and DWARF 2 */ \ |
538 | .debug_aranges 0 : { *(.debug_aranges) } \ |
539 | .debug_pubnames 0 : { *(.debug_pubnames) } \ |
540 | /* DWARF 2 */ \ |
541 | .debug_info 0 : { *(.debug_info \ |
542 | .gnu.linkonce.wi.*) } \ |
543 | .debug_abbrev 0 : { *(.debug_abbrev) } \ |
544 | .debug_line 0 : { *(.debug_line) } \ |
545 | .debug_frame 0 : { *(.debug_frame) } \ |
546 | .debug_str 0 : { *(.debug_str) } \ |
547 | .debug_loc 0 : { *(.debug_loc) } \ |
548 | .debug_macinfo 0 : { *(.debug_macinfo) } \ |
549 | /* SGI/MIPS DWARF 2 extensions */ \ |
550 | .debug_weaknames 0 : { *(.debug_weaknames) } \ |
551 | .debug_funcnames 0 : { *(.debug_funcnames) } \ |
552 | .debug_typenames 0 : { *(.debug_typenames) } \ |
553 | .debug_varnames 0 : { *(.debug_varnames) } \ |
554 | |
555 | /* Stabs debugging sections. */ |
556 | #define STABS_DEBUG \ |
557 | .stab 0 : { *(.stab) } \ |
558 | .stabstr 0 : { *(.stabstr) } \ |
559 | .stab.excl 0 : { *(.stab.excl) } \ |
560 | .stab.exclstr 0 : { *(.stab.exclstr) } \ |
561 | .stab.index 0 : { *(.stab.index) } \ |
562 | .stab.indexstr 0 : { *(.stab.indexstr) } \ |
563 | .comment 0 : { *(.comment) } |
564 | |
565 | #ifdef CONFIG_GENERIC_BUG |
566 | #define BUG_TABLE \ |
567 | . = ALIGN(8); \ |
568 | __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ |
569 | VMLINUX_SYMBOL(__start___bug_table) = .; \ |
570 | *(__bug_table) \ |
571 | VMLINUX_SYMBOL(__stop___bug_table) = .; \ |
572 | } |
573 | #else |
574 | #define BUG_TABLE |
575 | #endif |
576 | |
577 | #ifdef CONFIG_PM_TRACE |
578 | #define TRACEDATA \ |
579 | . = ALIGN(4); \ |
580 | .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ |
581 | VMLINUX_SYMBOL(__tracedata_start) = .; \ |
582 | *(.tracedata) \ |
583 | VMLINUX_SYMBOL(__tracedata_end) = .; \ |
584 | } |
585 | #else |
586 | #define TRACEDATA |
587 | #endif |
588 | |
589 | #define NOTES \ |
590 | .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ |
591 | VMLINUX_SYMBOL(__start_notes) = .; \ |
592 | *(.note.*) \ |
593 | VMLINUX_SYMBOL(__stop_notes) = .; \ |
594 | } |
595 | |
596 | #define INIT_SETUP(initsetup_align) \ |
597 | . = ALIGN(initsetup_align); \ |
598 | VMLINUX_SYMBOL(__setup_start) = .; \ |
599 | *(.init.setup) \ |
600 | VMLINUX_SYMBOL(__setup_end) = .; |
601 | |
602 | #define INITCALLS \ |
603 | *(.initcallearly.init) \ |
604 | VMLINUX_SYMBOL(__early_initcall_end) = .; \ |
605 | *(.initcall0.init) \ |
606 | *(.initcall0s.init) \ |
607 | *(.initcall1.init) \ |
608 | *(.initcall1s.init) \ |
609 | *(.initcall2.init) \ |
610 | *(.initcall2s.init) \ |
611 | *(.initcall3.init) \ |
612 | *(.initcall3s.init) \ |
613 | *(.initcall4.init) \ |
614 | *(.initcall4s.init) \ |
615 | *(.initcall5.init) \ |
616 | *(.initcall5s.init) \ |
617 | *(.initcallrootfs.init) \ |
618 | *(.initcall6.init) \ |
619 | *(.initcall6s.init) \ |
620 | *(.initcall7.init) \ |
621 | *(.initcall7s.init) |
622 | |
623 | #define INIT_CALLS \ |
624 | VMLINUX_SYMBOL(__initcall_start) = .; \ |
625 | INITCALLS \ |
626 | VMLINUX_SYMBOL(__initcall_end) = .; |
627 | |
628 | #define CON_INITCALL \ |
629 | VMLINUX_SYMBOL(__con_initcall_start) = .; \ |
630 | *(.con_initcall.init) \ |
631 | VMLINUX_SYMBOL(__con_initcall_end) = .; |
632 | |
633 | #define SECURITY_INITCALL \ |
634 | VMLINUX_SYMBOL(__security_initcall_start) = .; \ |
635 | *(.security_initcall.init) \ |
636 | VMLINUX_SYMBOL(__security_initcall_end) = .; |
637 | |
638 | #ifdef CONFIG_BLK_DEV_INITRD |
639 | #define INIT_RAM_FS \ |
640 | . = ALIGN(PAGE_SIZE); \ |
641 | VMLINUX_SYMBOL(__initramfs_start) = .; \ |
642 | *(.init.ramfs) \ |
643 | VMLINUX_SYMBOL(__initramfs_end) = .; |
644 | #else |
645 | #define INIT_RAM_FS |
646 | #endif |
647 | |
648 | /* |
649 | * Default discarded sections. |
650 | * |
651 | * Some archs want to discard exit text/data at runtime rather than |
652 | * link time due to cross-section references such as alt instructions, |
653 | * bug table, eh_frame, etc. DISCARDS must be the last of output |
654 | * section definitions so that such archs put those in earlier section |
655 | * definitions. |
656 | */ |
657 | #define DISCARDS \ |
658 | /DISCARD/ : { \ |
659 | EXIT_TEXT \ |
660 | EXIT_DATA \ |
661 | EXIT_CALL \ |
662 | SYMTAB_DISCARD \ |
663 | SYMTAB_DISCARD_GPL \ |
664 | SYMTAB_DISCARD_STR \ |
665 | *(.discard) \ |
666 | } |
667 | |
668 | /** |
669 | * PERCPU_VADDR - define output section for percpu area |
670 | * @vaddr: explicit base address (optional) |
671 | * @phdr: destination PHDR (optional) |
672 | * |
673 | * Macro which expands to output section for percpu area. If @vaddr |
674 | * is not blank, it specifies explicit base address and all percpu |
675 | * symbols will be offset from the given address. If blank, @vaddr |
676 | * always equals @laddr + LOAD_OFFSET. |
677 | * |
678 | * @phdr defines the output PHDR to use if not blank. Be warned that |
679 | * output PHDR is sticky. If @phdr is specified, the next output |
680 | * section in the linker script will go there too. @phdr should have |
681 | * a leading colon. |
682 | * |
683 | * Note that this macros defines __per_cpu_load as an absolute symbol. |
684 | * If there is no need to put the percpu section at a predetermined |
685 | * address, use PERCPU(). |
686 | */ |
687 | #define PERCPU_VADDR(vaddr, phdr) \ |
688 | VMLINUX_SYMBOL(__per_cpu_load) = .; \ |
689 | .data.percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load) \ |
690 | - LOAD_OFFSET) { \ |
691 | VMLINUX_SYMBOL(__per_cpu_start) = .; \ |
692 | *(.data.percpu.first) \ |
693 | *(.data.percpu.page_aligned) \ |
694 | *(.data.percpu) \ |
695 | *(.data.percpu.shared_aligned) \ |
696 | VMLINUX_SYMBOL(__per_cpu_end) = .; \ |
697 | } phdr \ |
698 | . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data.percpu); |
699 | |
700 | /** |
701 | * PERCPU - define output section for percpu area, simple version |
702 | * @align: required alignment |
703 | * |
704 | * Align to @align and outputs output section for percpu area. This |
705 | * macro doesn't maniuplate @vaddr or @phdr and __per_cpu_load and |
706 | * __per_cpu_start will be identical. |
707 | * |
708 | * This macro is equivalent to ALIGN(align); PERCPU_VADDR( , ) except |
709 | * that __per_cpu_load is defined as a relative symbol against |
710 | * .data.percpu which is required for relocatable x86_32 |
711 | * configuration. |
712 | */ |
713 | #define PERCPU(align) \ |
714 | . = ALIGN(align); \ |
715 | .data.percpu : AT(ADDR(.data.percpu) - LOAD_OFFSET) { \ |
716 | VMLINUX_SYMBOL(__per_cpu_load) = .; \ |
717 | VMLINUX_SYMBOL(__per_cpu_start) = .; \ |
718 | *(.data.percpu.first) \ |
719 | *(.data.percpu.page_aligned) \ |
720 | *(.data.percpu) \ |
721 | *(.data.percpu.shared_aligned) \ |
722 | VMLINUX_SYMBOL(__per_cpu_end) = .; \ |
723 | } |
724 | |
725 | |
726 | /* |
727 | * Definition of the high level *_SECTION macros |
728 | * They will fit only a subset of the architectures |
729 | */ |
730 | |
731 | |
732 | /* |
733 | * Writeable data. |
734 | * All sections are combined in a single .data section. |
735 | * The sections following CONSTRUCTORS are arranged so their |
736 | * typical alignment matches. |
737 | * A cacheline is typical/always less than a PAGE_SIZE so |
738 | * the sections that has this restriction (or similar) |
739 | * is located before the ones requiring PAGE_SIZE alignment. |
740 | * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which |
741 | * matches the requirment of PAGE_ALIGNED_DATA. |
742 | * |
743 | * use 0 as page_align if page_aligned data is not used */ |
744 | #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \ |
745 | . = ALIGN(PAGE_SIZE); \ |
746 | .data : AT(ADDR(.data) - LOAD_OFFSET) { \ |
747 | INIT_TASK_DATA(inittask) \ |
748 | NOSAVE_DATA \ |
749 | PAGE_ALIGNED_DATA(pagealigned) \ |
750 | CACHELINE_ALIGNED_DATA(cacheline) \ |
751 | READ_MOSTLY_DATA(cacheline) \ |
752 | DATA_DATA \ |
753 | CONSTRUCTORS \ |
754 | } |
755 | |
756 | #define INIT_TEXT_SECTION(inittext_align) \ |
757 | . = ALIGN(inittext_align); \ |
758 | .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ |
759 | VMLINUX_SYMBOL(_sinittext) = .; \ |
760 | INIT_TEXT \ |
761 | VMLINUX_SYMBOL(_einittext) = .; \ |
762 | } |
763 | |
764 | #define INIT_DATA_SECTION(initsetup_align) \ |
765 | .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ |
766 | INIT_DATA \ |
767 | INIT_SETUP(initsetup_align) \ |
768 | INIT_CALLS \ |
769 | CON_INITCALL \ |
770 | SECURITY_INITCALL \ |
771 | INIT_RAM_FS \ |
772 | } |
773 | |
774 | #define BSS_SECTION(sbss_align, bss_align, stop_align) \ |
775 | . = ALIGN(sbss_align); \ |
776 | VMLINUX_SYMBOL(__bss_start) = .; \ |
777 | SBSS(sbss_align) \ |
778 | BSS(bss_align) \ |
779 | . = ALIGN(stop_align); \ |
780 | VMLINUX_SYMBOL(__bss_stop) = .; |
781 |
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