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 requirements] 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 #include <asm-generic/codetag.lds.h> 54 55 #ifndef LOAD_OFFSET 56 #define LOAD_OFFSET 0 57 #endif 58 59 /* 60 * Only some architectures want to have the .notes segment visible in 61 * a separate PT_NOTE ELF Program Header. When this happens, it needs 62 * to be visible in both the kernel text's PT_LOAD and the PT_NOTE 63 * Program Headers. In this case, though, the PT_LOAD needs to be made 64 * the default again so that all the following sections don't also end 65 * up in the PT_NOTE Program Header. 66 */ 67 #ifdef EMITS_PT_NOTE 68 #define NOTES_HEADERS :text :note 69 #define NOTES_HEADERS_RESTORE __restore_ph : { *(.__restore_ph) } :text 70 #else 71 #define NOTES_HEADERS 72 #define NOTES_HEADERS_RESTORE 73 #endif 74 75 /* 76 * Some architectures have non-executable read-only exception tables. 77 * They can be added to the RO_DATA segment by specifying their desired 78 * alignment. 79 */ 80 #ifdef RO_EXCEPTION_TABLE_ALIGN 81 #define RO_EXCEPTION_TABLE EXCEPTION_TABLE(RO_EXCEPTION_TABLE_ALIGN) 82 #else 83 #define RO_EXCEPTION_TABLE 84 #endif 85 86 /* Align . function alignment. */ 87 #define ALIGN_FUNCTION() . = ALIGN(CONFIG_FUNCTION_ALIGNMENT) 88 89 /* 90 * LD_DEAD_CODE_DATA_ELIMINATION option enables -fdata-sections, which 91 * generates .data.identifier sections, which need to be pulled in with 92 * .data. We don't want to pull in .data..other sections, which Linux 93 * has defined. Same for text and bss. 94 * 95 * With LTO_CLANG, the linker also splits sections by default, so we need 96 * these macros to combine the sections during the final link. 97 * 98 * RODATA_MAIN is not used because existing code already defines .rodata.x 99 * sections to be brought in with rodata. 100 */ 101 #if defined(CONFIG_LD_DEAD_CODE_DATA_ELIMINATION) || defined(CONFIG_LTO_CLANG) 102 #define TEXT_MAIN .text .text.[0-9a-zA-Z_]* 103 #define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..L* .data..compoundliteral* .data.$__unnamed_* .data.$L* 104 #define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]* 105 #define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]* .rodata..L* 106 #define BSS_MAIN .bss .bss.[0-9a-zA-Z_]* .bss..compoundliteral* 107 #define SBSS_MAIN .sbss .sbss.[0-9a-zA-Z_]* 108 #else 109 #define TEXT_MAIN .text 110 #define DATA_MAIN .data 111 #define SDATA_MAIN .sdata 112 #define RODATA_MAIN .rodata 113 #define BSS_MAIN .bss 114 #define SBSS_MAIN .sbss 115 #endif 116 117 /* 118 * GCC 4.5 and later have a 32 bytes section alignment for structures. 119 * Except GCC 4.9, that feels the need to align on 64 bytes. 120 */ 121 #define STRUCT_ALIGNMENT 32 122 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT) 123 124 /* 125 * The order of the sched class addresses are important, as they are 126 * used to determine the order of the priority of each sched class in 127 * relation to each other. 128 */ 129 #define SCHED_DATA \ 130 STRUCT_ALIGN(); \ 131 __sched_class_highest = .; \ 132 *(__stop_sched_class) \ 133 *(__dl_sched_class) \ 134 *(__rt_sched_class) \ 135 *(__fair_sched_class) \ 136 *(__idle_sched_class) \ 137 __sched_class_lowest = .; 138 139 /* The actual configuration determine if the init/exit sections 140 * are handled as text/data or they can be discarded (which 141 * often happens at runtime) 142 */ 143 144 #ifndef CONFIG_HAVE_DYNAMIC_FTRACE_NO_PATCHABLE 145 #define KEEP_PATCHABLE KEEP(*(__patchable_function_entries)) 146 #define PATCHABLE_DISCARDS 147 #else 148 #define KEEP_PATCHABLE 149 #define PATCHABLE_DISCARDS *(__patchable_function_entries) 150 #endif 151 152 #ifndef CONFIG_ARCH_SUPPORTS_CFI_CLANG 153 /* 154 * Simply points to ftrace_stub, but with the proper protocol. 155 * Defined by the linker script in linux/vmlinux.lds.h 156 */ 157 #define FTRACE_STUB_HACK ftrace_stub_graph = ftrace_stub; 158 #else 159 #define FTRACE_STUB_HACK 160 #endif 161 162 #ifdef CONFIG_FTRACE_MCOUNT_RECORD 163 /* 164 * The ftrace call sites are logged to a section whose name depends on the 165 * compiler option used. A given kernel image will only use one, AKA 166 * FTRACE_CALLSITE_SECTION. We capture all of them here to avoid header 167 * dependencies for FTRACE_CALLSITE_SECTION's definition. 168 * 169 * ftrace_ops_list_func will be defined as arch_ftrace_ops_list_func 170 * as some archs will have a different prototype for that function 171 * but ftrace_ops_list_func() will have a single prototype. 172 */ 173 #define MCOUNT_REC() . = ALIGN(8); \ 174 __start_mcount_loc = .; \ 175 KEEP(*(__mcount_loc)) \ 176 KEEP_PATCHABLE \ 177 __stop_mcount_loc = .; \ 178 FTRACE_STUB_HACK \ 179 ftrace_ops_list_func = arch_ftrace_ops_list_func; 180 #else 181 # ifdef CONFIG_FUNCTION_TRACER 182 # define MCOUNT_REC() FTRACE_STUB_HACK \ 183 ftrace_ops_list_func = arch_ftrace_ops_list_func; 184 # else 185 # define MCOUNT_REC() 186 # endif 187 #endif 188 189 #define BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_) \ 190 _BEGIN_##_label_ = .; \ 191 KEEP(*(_sec_)) \ 192 _END_##_label_ = .; 193 194 #define BOUNDED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_) \ 195 _label_##_BEGIN_ = .; \ 196 KEEP(*(_sec_)) \ 197 _label_##_END_ = .; 198 199 #define BOUNDED_SECTION_BY(_sec_, _label_) \ 200 BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, __start, __stop) 201 202 #define BOUNDED_SECTION(_sec) BOUNDED_SECTION_BY(_sec, _sec) 203 204 #define HEADERED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_, _HDR_) \ 205 _HDR_##_label_ = .; \ 206 KEEP(*(.gnu.linkonce.##_sec_)) \ 207 BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_) 208 209 #define HEADERED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_, _HDR_) \ 210 _label_##_HDR_ = .; \ 211 KEEP(*(.gnu.linkonce.##_sec_)) \ 212 BOUNDED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_) 213 214 #define HEADERED_SECTION_BY(_sec_, _label_) \ 215 HEADERED_SECTION_PRE_LABEL(_sec_, _label_, __start, __stop) 216 217 #define HEADERED_SECTION(_sec) HEADERED_SECTION_BY(_sec, _sec) 218 219 #ifdef CONFIG_TRACE_BRANCH_PROFILING 220 #define LIKELY_PROFILE() \ 221 BOUNDED_SECTION_BY(_ftrace_annotated_branch, _annotated_branch_profile) 222 #else 223 #define LIKELY_PROFILE() 224 #endif 225 226 #ifdef CONFIG_PROFILE_ALL_BRANCHES 227 #define BRANCH_PROFILE() \ 228 BOUNDED_SECTION_BY(_ftrace_branch, _branch_profile) 229 #else 230 #define BRANCH_PROFILE() 231 #endif 232 233 #ifdef CONFIG_KPROBES 234 #define KPROBE_BLACKLIST() \ 235 . = ALIGN(8); \ 236 BOUNDED_SECTION(_kprobe_blacklist) 237 #else 238 #define KPROBE_BLACKLIST() 239 #endif 240 241 #ifdef CONFIG_FUNCTION_ERROR_INJECTION 242 #define ERROR_INJECT_WHITELIST() \ 243 STRUCT_ALIGN(); \ 244 BOUNDED_SECTION(_error_injection_whitelist) 245 #else 246 #define ERROR_INJECT_WHITELIST() 247 #endif 248 249 #ifdef CONFIG_EVENT_TRACING 250 #define FTRACE_EVENTS() \ 251 . = ALIGN(8); \ 252 BOUNDED_SECTION(_ftrace_events) \ 253 BOUNDED_SECTION_BY(_ftrace_eval_map, _ftrace_eval_maps) 254 #else 255 #define FTRACE_EVENTS() 256 #endif 257 258 #ifdef CONFIG_TRACING 259 #define TRACE_PRINTKS() BOUNDED_SECTION_BY(__trace_printk_fmt, ___trace_bprintk_fmt) 260 #define TRACEPOINT_STR() BOUNDED_SECTION_BY(__tracepoint_str, ___tracepoint_str) 261 #else 262 #define TRACE_PRINTKS() 263 #define TRACEPOINT_STR() 264 #endif 265 266 #ifdef CONFIG_FTRACE_SYSCALLS 267 #define TRACE_SYSCALLS() \ 268 . = ALIGN(8); \ 269 BOUNDED_SECTION_BY(__syscalls_metadata, _syscalls_metadata) 270 #else 271 #define TRACE_SYSCALLS() 272 #endif 273 274 #ifdef CONFIG_BPF_EVENTS 275 #define BPF_RAW_TP() STRUCT_ALIGN(); \ 276 BOUNDED_SECTION_BY(__bpf_raw_tp_map, __bpf_raw_tp) 277 #else 278 #define BPF_RAW_TP() 279 #endif 280 281 #ifdef CONFIG_SERIAL_EARLYCON 282 #define EARLYCON_TABLE() \ 283 . = ALIGN(8); \ 284 BOUNDED_SECTION_POST_LABEL(__earlycon_table, __earlycon_table, , _end) 285 #else 286 #define EARLYCON_TABLE() 287 #endif 288 289 #ifdef CONFIG_SECURITY 290 #define LSM_TABLE() \ 291 . = ALIGN(8); \ 292 BOUNDED_SECTION_PRE_LABEL(.lsm_info.init, _lsm_info, __start, __end) 293 294 #define EARLY_LSM_TABLE() \ 295 . = ALIGN(8); \ 296 BOUNDED_SECTION_PRE_LABEL(.early_lsm_info.init, _early_lsm_info, __start, __end) 297 #else 298 #define LSM_TABLE() 299 #define EARLY_LSM_TABLE() 300 #endif 301 302 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name) 303 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name) 304 #define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name) 305 #define _OF_TABLE_0(name) 306 #define _OF_TABLE_1(name) \ 307 . = ALIGN(8); \ 308 __##name##_of_table = .; \ 309 KEEP(*(__##name##_of_table)) \ 310 KEEP(*(__##name##_of_table_end)) 311 312 #define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer) 313 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip) 314 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk) 315 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem) 316 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method) 317 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method) 318 319 #ifdef CONFIG_ACPI 320 #define ACPI_PROBE_TABLE(name) \ 321 . = ALIGN(8); \ 322 BOUNDED_SECTION_POST_LABEL(__##name##_acpi_probe_table, \ 323 __##name##_acpi_probe_table,, _end) 324 #else 325 #define ACPI_PROBE_TABLE(name) 326 #endif 327 328 #ifdef CONFIG_THERMAL 329 #define THERMAL_TABLE(name) \ 330 . = ALIGN(8); \ 331 BOUNDED_SECTION_POST_LABEL(__##name##_thermal_table, \ 332 __##name##_thermal_table,, _end) 333 #else 334 #define THERMAL_TABLE(name) 335 #endif 336 337 #define KERNEL_DTB() \ 338 STRUCT_ALIGN(); \ 339 __dtb_start = .; \ 340 KEEP(*(.dtb.init.rodata)) \ 341 __dtb_end = .; 342 343 /* 344 * .data section 345 */ 346 #define DATA_DATA \ 347 *(.xiptext) \ 348 *(DATA_MAIN) \ 349 *(.data..decrypted) \ 350 *(.ref.data) \ 351 *(.data..shared_aligned) /* percpu related */ \ 352 *(.data.unlikely) \ 353 __start_once = .; \ 354 *(.data.once) \ 355 __end_once = .; \ 356 STRUCT_ALIGN(); \ 357 *(__tracepoints) \ 358 /* implement dynamic printk debug */ \ 359 . = ALIGN(8); \ 360 BOUNDED_SECTION_BY(__dyndbg_classes, ___dyndbg_classes) \ 361 BOUNDED_SECTION_BY(__dyndbg, ___dyndbg) \ 362 CODETAG_SECTIONS() \ 363 LIKELY_PROFILE() \ 364 BRANCH_PROFILE() \ 365 TRACE_PRINTKS() \ 366 BPF_RAW_TP() \ 367 TRACEPOINT_STR() \ 368 KUNIT_TABLE() 369 370 /* 371 * Data section helpers 372 */ 373 #define NOSAVE_DATA \ 374 . = ALIGN(PAGE_SIZE); \ 375 __nosave_begin = .; \ 376 *(.data..nosave) \ 377 . = ALIGN(PAGE_SIZE); \ 378 __nosave_end = .; 379 380 #define PAGE_ALIGNED_DATA(page_align) \ 381 . = ALIGN(page_align); \ 382 *(.data..page_aligned) \ 383 . = ALIGN(page_align); 384 385 #define READ_MOSTLY_DATA(align) \ 386 . = ALIGN(align); \ 387 *(.data..read_mostly) \ 388 . = ALIGN(align); 389 390 #define CACHELINE_ALIGNED_DATA(align) \ 391 . = ALIGN(align); \ 392 *(.data..cacheline_aligned) 393 394 #define INIT_TASK_DATA(align) \ 395 . = ALIGN(align); \ 396 __start_init_stack = .; \ 397 init_thread_union = .; \ 398 init_stack = .; \ 399 KEEP(*(.data..init_task)) \ 400 KEEP(*(.data..init_thread_info)) \ 401 . = __start_init_stack + THREAD_SIZE; \ 402 __end_init_stack = .; 403 404 #define JUMP_TABLE_DATA \ 405 . = ALIGN(8); \ 406 BOUNDED_SECTION_BY(__jump_table, ___jump_table) 407 408 #ifdef CONFIG_HAVE_STATIC_CALL_INLINE 409 #define STATIC_CALL_DATA \ 410 . = ALIGN(8); \ 411 BOUNDED_SECTION_BY(.static_call_sites, _static_call_sites) \ 412 BOUNDED_SECTION_BY(.static_call_tramp_key, _static_call_tramp_key) 413 #else 414 #define STATIC_CALL_DATA 415 #endif 416 417 /* 418 * Allow architectures to handle ro_after_init data on their 419 * own by defining an empty RO_AFTER_INIT_DATA. 420 */ 421 #ifndef RO_AFTER_INIT_DATA 422 #define RO_AFTER_INIT_DATA \ 423 . = ALIGN(8); \ 424 __start_ro_after_init = .; \ 425 *(.data..ro_after_init) \ 426 JUMP_TABLE_DATA \ 427 STATIC_CALL_DATA \ 428 __end_ro_after_init = .; 429 #endif 430 431 /* 432 * .kcfi_traps contains a list KCFI trap locations. 433 */ 434 #ifndef KCFI_TRAPS 435 #ifdef CONFIG_ARCH_USES_CFI_TRAPS 436 #define KCFI_TRAPS \ 437 __kcfi_traps : AT(ADDR(__kcfi_traps) - LOAD_OFFSET) { \ 438 BOUNDED_SECTION_BY(.kcfi_traps, ___kcfi_traps) \ 439 } 440 #else 441 #define KCFI_TRAPS 442 #endif 443 #endif 444 445 /* 446 * Some symbol definitions will not exist yet during the first pass of the 447 * link, but are guaranteed to exist in the final link. Provide preliminary 448 * definitions that will be superseded in the final link to avoid having to 449 * rely on weak external linkage, which requires a GOT when used in position 450 * independent code. 451 */ 452 #define PRELIMINARY_SYMBOL_DEFINITIONS \ 453 PROVIDE(kallsyms_addresses = .); \ 454 PROVIDE(kallsyms_offsets = .); \ 455 PROVIDE(kallsyms_names = .); \ 456 PROVIDE(kallsyms_num_syms = .); \ 457 PROVIDE(kallsyms_relative_base = .); \ 458 PROVIDE(kallsyms_token_table = .); \ 459 PROVIDE(kallsyms_token_index = .); \ 460 PROVIDE(kallsyms_markers = .); \ 461 PROVIDE(kallsyms_seqs_of_names = .); 462 463 /* 464 * Read only Data 465 */ 466 #define RO_DATA(align) \ 467 . = ALIGN((align)); \ 468 PRELIMINARY_SYMBOL_DEFINITIONS \ 469 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 470 __start_rodata = .; \ 471 *(.rodata) *(.rodata.*) \ 472 SCHED_DATA \ 473 RO_AFTER_INIT_DATA /* Read only after init */ \ 474 . = ALIGN(8); \ 475 BOUNDED_SECTION_BY(__tracepoints_ptrs, ___tracepoints_ptrs) \ 476 *(__tracepoints_strings)/* Tracepoints: strings */ \ 477 } \ 478 \ 479 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 480 *(.rodata1) \ 481 } \ 482 \ 483 /* PCI quirks */ \ 484 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 485 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_early, _pci_fixups_early, __start, __end) \ 486 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_header, _pci_fixups_header, __start, __end) \ 487 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_final, _pci_fixups_final, __start, __end) \ 488 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_enable, _pci_fixups_enable, __start, __end) \ 489 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_resume, _pci_fixups_resume, __start, __end) \ 490 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_suspend, _pci_fixups_suspend, __start, __end) \ 491 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_resume_early, _pci_fixups_resume_early, __start, __end) \ 492 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_suspend_late, _pci_fixups_suspend_late, __start, __end) \ 493 } \ 494 \ 495 FW_LOADER_BUILT_IN_DATA \ 496 TRACEDATA \ 497 \ 498 PRINTK_INDEX \ 499 \ 500 /* Kernel symbol table: Normal symbols */ \ 501 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 502 __start___ksymtab = .; \ 503 KEEP(*(SORT(___ksymtab+*))) \ 504 __stop___ksymtab = .; \ 505 } \ 506 \ 507 /* Kernel symbol table: GPL-only symbols */ \ 508 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 509 __start___ksymtab_gpl = .; \ 510 KEEP(*(SORT(___ksymtab_gpl+*))) \ 511 __stop___ksymtab_gpl = .; \ 512 } \ 513 \ 514 /* Kernel symbol table: Normal symbols */ \ 515 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 516 __start___kcrctab = .; \ 517 KEEP(*(SORT(___kcrctab+*))) \ 518 __stop___kcrctab = .; \ 519 } \ 520 \ 521 /* Kernel symbol table: GPL-only symbols */ \ 522 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 523 __start___kcrctab_gpl = .; \ 524 KEEP(*(SORT(___kcrctab_gpl+*))) \ 525 __stop___kcrctab_gpl = .; \ 526 } \ 527 \ 528 /* Kernel symbol table: strings */ \ 529 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 530 *(__ksymtab_strings) \ 531 } \ 532 \ 533 /* __*init sections */ \ 534 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 535 *(.ref.rodata) \ 536 } \ 537 \ 538 /* Built-in module parameters. */ \ 539 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 540 BOUNDED_SECTION_BY(__param, ___param) \ 541 } \ 542 \ 543 /* Built-in module versions. */ \ 544 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 545 BOUNDED_SECTION_BY(__modver, ___modver) \ 546 } \ 547 \ 548 KCFI_TRAPS \ 549 \ 550 RO_EXCEPTION_TABLE \ 551 NOTES \ 552 BTF \ 553 \ 554 . = ALIGN((align)); \ 555 __end_rodata = .; 556 557 558 /* 559 * Non-instrumentable text section 560 */ 561 #define NOINSTR_TEXT \ 562 ALIGN_FUNCTION(); \ 563 __noinstr_text_start = .; \ 564 *(.noinstr.text) \ 565 __cpuidle_text_start = .; \ 566 *(.cpuidle.text) \ 567 __cpuidle_text_end = .; \ 568 __noinstr_text_end = .; 569 570 /* 571 * .text section. Map to function alignment to avoid address changes 572 * during second ld run in second ld pass when generating System.map 573 * 574 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead 575 * code elimination is enabled, so these sections should be converted 576 * to use ".." first. 577 */ 578 #define TEXT_TEXT \ 579 ALIGN_FUNCTION(); \ 580 *(.text.hot .text.hot.*) \ 581 *(TEXT_MAIN .text.fixup) \ 582 *(.text.unlikely .text.unlikely.*) \ 583 *(.text.unknown .text.unknown.*) \ 584 NOINSTR_TEXT \ 585 *(.ref.text) \ 586 *(.text.asan.* .text.tsan.*) 587 588 589 /* sched.text is aling to function alignment to secure we have same 590 * address even at second ld pass when generating System.map */ 591 #define SCHED_TEXT \ 592 ALIGN_FUNCTION(); \ 593 __sched_text_start = .; \ 594 *(.sched.text) \ 595 __sched_text_end = .; 596 597 /* spinlock.text is aling to function alignment to secure we have same 598 * address even at second ld pass when generating System.map */ 599 #define LOCK_TEXT \ 600 ALIGN_FUNCTION(); \ 601 __lock_text_start = .; \ 602 *(.spinlock.text) \ 603 __lock_text_end = .; 604 605 #define KPROBES_TEXT \ 606 ALIGN_FUNCTION(); \ 607 __kprobes_text_start = .; \ 608 *(.kprobes.text) \ 609 __kprobes_text_end = .; 610 611 #define ENTRY_TEXT \ 612 ALIGN_FUNCTION(); \ 613 __entry_text_start = .; \ 614 *(.entry.text) \ 615 __entry_text_end = .; 616 617 #define IRQENTRY_TEXT \ 618 ALIGN_FUNCTION(); \ 619 __irqentry_text_start = .; \ 620 *(.irqentry.text) \ 621 __irqentry_text_end = .; 622 623 #define SOFTIRQENTRY_TEXT \ 624 ALIGN_FUNCTION(); \ 625 __softirqentry_text_start = .; \ 626 *(.softirqentry.text) \ 627 __softirqentry_text_end = .; 628 629 #define STATIC_CALL_TEXT \ 630 ALIGN_FUNCTION(); \ 631 __static_call_text_start = .; \ 632 *(.static_call.text) \ 633 __static_call_text_end = .; 634 635 /* Section used for early init (in .S files) */ 636 #define HEAD_TEXT KEEP(*(.head.text)) 637 638 #define HEAD_TEXT_SECTION \ 639 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 640 HEAD_TEXT \ 641 } 642 643 /* 644 * Exception table 645 */ 646 #define EXCEPTION_TABLE(align) \ 647 . = ALIGN(align); \ 648 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 649 BOUNDED_SECTION_BY(__ex_table, ___ex_table) \ 650 } 651 652 /* 653 * .BTF 654 */ 655 #ifdef CONFIG_DEBUG_INFO_BTF 656 #define BTF \ 657 .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \ 658 BOUNDED_SECTION_BY(.BTF, _BTF) \ 659 } \ 660 . = ALIGN(4); \ 661 .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) { \ 662 *(.BTF_ids) \ 663 } 664 #else 665 #define BTF 666 #endif 667 668 /* 669 * Init task 670 */ 671 #define INIT_TASK_DATA_SECTION(align) \ 672 . = ALIGN(align); \ 673 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 674 INIT_TASK_DATA(align) \ 675 } 676 677 #ifdef CONFIG_CONSTRUCTORS 678 #define KERNEL_CTORS() . = ALIGN(8); \ 679 __ctors_start = .; \ 680 KEEP(*(SORT(.ctors.*))) \ 681 KEEP(*(.ctors)) \ 682 KEEP(*(SORT(.init_array.*))) \ 683 KEEP(*(.init_array)) \ 684 __ctors_end = .; 685 #else 686 #define KERNEL_CTORS() 687 #endif 688 689 /* init and exit section handling */ 690 #define INIT_DATA \ 691 KEEP(*(SORT(___kentry+*))) \ 692 *(.init.data .init.data.*) \ 693 KERNEL_CTORS() \ 694 MCOUNT_REC() \ 695 *(.init.rodata .init.rodata.*) \ 696 FTRACE_EVENTS() \ 697 TRACE_SYSCALLS() \ 698 KPROBE_BLACKLIST() \ 699 ERROR_INJECT_WHITELIST() \ 700 CLK_OF_TABLES() \ 701 RESERVEDMEM_OF_TABLES() \ 702 TIMER_OF_TABLES() \ 703 CPU_METHOD_OF_TABLES() \ 704 CPUIDLE_METHOD_OF_TABLES() \ 705 KERNEL_DTB() \ 706 IRQCHIP_OF_MATCH_TABLE() \ 707 ACPI_PROBE_TABLE(irqchip) \ 708 ACPI_PROBE_TABLE(timer) \ 709 THERMAL_TABLE(governor) \ 710 EARLYCON_TABLE() \ 711 LSM_TABLE() \ 712 EARLY_LSM_TABLE() \ 713 KUNIT_INIT_TABLE() 714 715 #define INIT_TEXT \ 716 *(.init.text .init.text.*) \ 717 *(.text.startup) 718 719 #define EXIT_DATA \ 720 *(.exit.data .exit.data.*) \ 721 *(.fini_array .fini_array.*) \ 722 *(.dtors .dtors.*) \ 723 724 #define EXIT_TEXT \ 725 *(.exit.text) \ 726 *(.text.exit) \ 727 728 #define EXIT_CALL \ 729 *(.exitcall.exit) 730 731 /* 732 * bss (Block Started by Symbol) - uninitialized data 733 * zeroed during startup 734 */ 735 #define SBSS(sbss_align) \ 736 . = ALIGN(sbss_align); \ 737 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 738 *(.dynsbss) \ 739 *(SBSS_MAIN) \ 740 *(.scommon) \ 741 } 742 743 /* 744 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 745 * sections to the front of bss. 746 */ 747 #ifndef BSS_FIRST_SECTIONS 748 #define BSS_FIRST_SECTIONS 749 #endif 750 751 #define BSS(bss_align) \ 752 . = ALIGN(bss_align); \ 753 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 754 BSS_FIRST_SECTIONS \ 755 . = ALIGN(PAGE_SIZE); \ 756 *(.bss..page_aligned) \ 757 . = ALIGN(PAGE_SIZE); \ 758 *(.dynbss) \ 759 *(BSS_MAIN) \ 760 *(COMMON) \ 761 } 762 763 /* 764 * DWARF debug sections. 765 * Symbols in the DWARF debugging sections are relative to 766 * the beginning of the section so we begin them at 0. 767 */ 768 #define DWARF_DEBUG \ 769 /* DWARF 1 */ \ 770 .debug 0 : { *(.debug) } \ 771 .line 0 : { *(.line) } \ 772 /* GNU DWARF 1 extensions */ \ 773 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 774 .debug_sfnames 0 : { *(.debug_sfnames) } \ 775 /* DWARF 1.1 and DWARF 2 */ \ 776 .debug_aranges 0 : { *(.debug_aranges) } \ 777 .debug_pubnames 0 : { *(.debug_pubnames) } \ 778 /* DWARF 2 */ \ 779 .debug_info 0 : { *(.debug_info \ 780 .gnu.linkonce.wi.*) } \ 781 .debug_abbrev 0 : { *(.debug_abbrev) } \ 782 .debug_line 0 : { *(.debug_line) } \ 783 .debug_frame 0 : { *(.debug_frame) } \ 784 .debug_str 0 : { *(.debug_str) } \ 785 .debug_loc 0 : { *(.debug_loc) } \ 786 .debug_macinfo 0 : { *(.debug_macinfo) } \ 787 .debug_pubtypes 0 : { *(.debug_pubtypes) } \ 788 /* DWARF 3 */ \ 789 .debug_ranges 0 : { *(.debug_ranges) } \ 790 /* SGI/MIPS DWARF 2 extensions */ \ 791 .debug_weaknames 0 : { *(.debug_weaknames) } \ 792 .debug_funcnames 0 : { *(.debug_funcnames) } \ 793 .debug_typenames 0 : { *(.debug_typenames) } \ 794 .debug_varnames 0 : { *(.debug_varnames) } \ 795 /* GNU DWARF 2 extensions */ \ 796 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \ 797 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \ 798 /* DWARF 4 */ \ 799 .debug_types 0 : { *(.debug_types) } \ 800 /* DWARF 5 */ \ 801 .debug_addr 0 : { *(.debug_addr) } \ 802 .debug_line_str 0 : { *(.debug_line_str) } \ 803 .debug_loclists 0 : { *(.debug_loclists) } \ 804 .debug_macro 0 : { *(.debug_macro) } \ 805 .debug_names 0 : { *(.debug_names) } \ 806 .debug_rnglists 0 : { *(.debug_rnglists) } \ 807 .debug_str_offsets 0 : { *(.debug_str_offsets) } 808 809 /* Stabs debugging sections. */ 810 #define STABS_DEBUG \ 811 .stab 0 : { *(.stab) } \ 812 .stabstr 0 : { *(.stabstr) } \ 813 .stab.excl 0 : { *(.stab.excl) } \ 814 .stab.exclstr 0 : { *(.stab.exclstr) } \ 815 .stab.index 0 : { *(.stab.index) } \ 816 .stab.indexstr 0 : { *(.stab.indexstr) } 817 818 /* Required sections not related to debugging. */ 819 #define ELF_DETAILS \ 820 .comment 0 : { *(.comment) } \ 821 .symtab 0 : { *(.symtab) } \ 822 .strtab 0 : { *(.strtab) } \ 823 .shstrtab 0 : { *(.shstrtab) } 824 825 #ifdef CONFIG_GENERIC_BUG 826 #define BUG_TABLE \ 827 . = ALIGN(8); \ 828 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 829 BOUNDED_SECTION_BY(__bug_table, ___bug_table) \ 830 } 831 #else 832 #define BUG_TABLE 833 #endif 834 835 #ifdef CONFIG_UNWINDER_ORC 836 #define ORC_UNWIND_TABLE \ 837 .orc_header : AT(ADDR(.orc_header) - LOAD_OFFSET) { \ 838 BOUNDED_SECTION_BY(.orc_header, _orc_header) \ 839 } \ 840 . = ALIGN(4); \ 841 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \ 842 BOUNDED_SECTION_BY(.orc_unwind_ip, _orc_unwind_ip) \ 843 } \ 844 . = ALIGN(2); \ 845 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \ 846 BOUNDED_SECTION_BY(.orc_unwind, _orc_unwind) \ 847 } \ 848 text_size = _etext - _stext; \ 849 . = ALIGN(4); \ 850 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \ 851 orc_lookup = .; \ 852 . += (((text_size + LOOKUP_BLOCK_SIZE - 1) / \ 853 LOOKUP_BLOCK_SIZE) + 1) * 4; \ 854 orc_lookup_end = .; \ 855 } 856 #else 857 #define ORC_UNWIND_TABLE 858 #endif 859 860 /* Built-in firmware blobs */ 861 #ifdef CONFIG_FW_LOADER 862 #define FW_LOADER_BUILT_IN_DATA \ 863 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) { \ 864 BOUNDED_SECTION_PRE_LABEL(.builtin_fw, _builtin_fw, __start, __end) \ 865 } 866 #else 867 #define FW_LOADER_BUILT_IN_DATA 868 #endif 869 870 #ifdef CONFIG_PM_TRACE 871 #define TRACEDATA \ 872 . = ALIGN(4); \ 873 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 874 BOUNDED_SECTION_POST_LABEL(.tracedata, __tracedata, _start, _end) \ 875 } 876 #else 877 #define TRACEDATA 878 #endif 879 880 #ifdef CONFIG_PRINTK_INDEX 881 #define PRINTK_INDEX \ 882 .printk_index : AT(ADDR(.printk_index) - LOAD_OFFSET) { \ 883 BOUNDED_SECTION_BY(.printk_index, _printk_index) \ 884 } 885 #else 886 #define PRINTK_INDEX 887 #endif 888 889 /* 890 * Discard .note.GNU-stack, which is emitted as PROGBITS by the compiler. 891 * Otherwise, the type of .notes section would become PROGBITS instead of NOTES. 892 * 893 * Also, discard .note.gnu.property, otherwise it forces the notes section to 894 * be 8-byte aligned which causes alignment mismatches with the kernel's custom 895 * 4-byte aligned notes. 896 */ 897 #define NOTES \ 898 /DISCARD/ : { \ 899 *(.note.GNU-stack) \ 900 *(.note.gnu.property) \ 901 } \ 902 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 903 BOUNDED_SECTION_BY(.note.*, _notes) \ 904 } NOTES_HEADERS \ 905 NOTES_HEADERS_RESTORE 906 907 #define INIT_SETUP(initsetup_align) \ 908 . = ALIGN(initsetup_align); \ 909 BOUNDED_SECTION_POST_LABEL(.init.setup, __setup, _start, _end) 910 911 #define INIT_CALLS_LEVEL(level) \ 912 __initcall##level##_start = .; \ 913 KEEP(*(.initcall##level##.init)) \ 914 KEEP(*(.initcall##level##s.init)) \ 915 916 #define INIT_CALLS \ 917 __initcall_start = .; \ 918 KEEP(*(.initcallearly.init)) \ 919 INIT_CALLS_LEVEL(0) \ 920 INIT_CALLS_LEVEL(1) \ 921 INIT_CALLS_LEVEL(2) \ 922 INIT_CALLS_LEVEL(3) \ 923 INIT_CALLS_LEVEL(4) \ 924 INIT_CALLS_LEVEL(5) \ 925 INIT_CALLS_LEVEL(rootfs) \ 926 INIT_CALLS_LEVEL(6) \ 927 INIT_CALLS_LEVEL(7) \ 928 __initcall_end = .; 929 930 #define CON_INITCALL \ 931 BOUNDED_SECTION_POST_LABEL(.con_initcall.init, __con_initcall, _start, _end) 932 933 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */ 934 #define KUNIT_TABLE() \ 935 . = ALIGN(8); \ 936 BOUNDED_SECTION_POST_LABEL(.kunit_test_suites, __kunit_suites, _start, _end) 937 938 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */ 939 #define KUNIT_INIT_TABLE() \ 940 . = ALIGN(8); \ 941 BOUNDED_SECTION_POST_LABEL(.kunit_init_test_suites, \ 942 __kunit_init_suites, _start, _end) 943 944 #ifdef CONFIG_BLK_DEV_INITRD 945 #define INIT_RAM_FS \ 946 . = ALIGN(4); \ 947 __initramfs_start = .; \ 948 KEEP(*(.init.ramfs)) \ 949 . = ALIGN(8); \ 950 KEEP(*(.init.ramfs.info)) 951 #else 952 #define INIT_RAM_FS 953 #endif 954 955 /* 956 * Memory encryption operates on a page basis. Since we need to clear 957 * the memory encryption mask for this section, it needs to be aligned 958 * on a page boundary and be a page-size multiple in length. 959 * 960 * Note: We use a separate section so that only this section gets 961 * decrypted to avoid exposing more than we wish. 962 */ 963 #ifdef CONFIG_AMD_MEM_ENCRYPT 964 #define PERCPU_DECRYPTED_SECTION \ 965 . = ALIGN(PAGE_SIZE); \ 966 *(.data..percpu..decrypted) \ 967 . = ALIGN(PAGE_SIZE); 968 #else 969 #define PERCPU_DECRYPTED_SECTION 970 #endif 971 972 973 /* 974 * Default discarded sections. 975 * 976 * Some archs want to discard exit text/data at runtime rather than 977 * link time due to cross-section references such as alt instructions, 978 * bug table, eh_frame, etc. DISCARDS must be the last of output 979 * section definitions so that such archs put those in earlier section 980 * definitions. 981 */ 982 #ifdef RUNTIME_DISCARD_EXIT 983 #define EXIT_DISCARDS 984 #else 985 #define EXIT_DISCARDS \ 986 EXIT_TEXT \ 987 EXIT_DATA 988 #endif 989 990 /* 991 * Clang's -fprofile-arcs, -fsanitize=kernel-address, and 992 * -fsanitize=thread produce unwanted sections (.eh_frame 993 * and .init_array.*), but CONFIG_CONSTRUCTORS wants to 994 * keep any .init_array.* sections. 995 * https://llvm.org/pr46478 996 */ 997 #ifdef CONFIG_UNWIND_TABLES 998 #define DISCARD_EH_FRAME 999 #else 1000 #define DISCARD_EH_FRAME *(.eh_frame) 1001 #endif 1002 #if defined(CONFIG_GCOV_KERNEL) || defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN) 1003 # ifdef CONFIG_CONSTRUCTORS 1004 # define SANITIZER_DISCARDS \ 1005 DISCARD_EH_FRAME 1006 # else 1007 # define SANITIZER_DISCARDS \ 1008 *(.init_array) *(.init_array.*) \ 1009 DISCARD_EH_FRAME 1010 # endif 1011 #else 1012 # define SANITIZER_DISCARDS 1013 #endif 1014 1015 #define COMMON_DISCARDS \ 1016 SANITIZER_DISCARDS \ 1017 PATCHABLE_DISCARDS \ 1018 *(.discard) \ 1019 *(.discard.*) \ 1020 *(.export_symbol) \ 1021 *(.modinfo) \ 1022 /* ld.bfd warns about .gnu.version* even when not emitted */ \ 1023 *(.gnu.version*) \ 1024 1025 #define DISCARDS \ 1026 /DISCARD/ : { \ 1027 EXIT_DISCARDS \ 1028 EXIT_CALL \ 1029 COMMON_DISCARDS \ 1030 } 1031 1032 /** 1033 * PERCPU_INPUT - the percpu input sections 1034 * @cacheline: cacheline size 1035 * 1036 * The core percpu section names and core symbols which do not rely 1037 * directly upon load addresses. 1038 * 1039 * @cacheline is used to align subsections to avoid false cacheline 1040 * sharing between subsections for different purposes. 1041 */ 1042 #define PERCPU_INPUT(cacheline) \ 1043 __per_cpu_start = .; \ 1044 *(.data..percpu..first) \ 1045 . = ALIGN(PAGE_SIZE); \ 1046 *(.data..percpu..page_aligned) \ 1047 . = ALIGN(cacheline); \ 1048 *(.data..percpu..read_mostly) \ 1049 . = ALIGN(cacheline); \ 1050 *(.data..percpu) \ 1051 *(.data..percpu..shared_aligned) \ 1052 PERCPU_DECRYPTED_SECTION \ 1053 __per_cpu_end = .; 1054 1055 /** 1056 * PERCPU_VADDR - define output section for percpu area 1057 * @cacheline: cacheline size 1058 * @vaddr: explicit base address (optional) 1059 * @phdr: destination PHDR (optional) 1060 * 1061 * Macro which expands to output section for percpu area. 1062 * 1063 * @cacheline is used to align subsections to avoid false cacheline 1064 * sharing between subsections for different purposes. 1065 * 1066 * If @vaddr is not blank, it specifies explicit base address and all 1067 * percpu symbols will be offset from the given address. If blank, 1068 * @vaddr always equals @laddr + LOAD_OFFSET. 1069 * 1070 * @phdr defines the output PHDR to use if not blank. Be warned that 1071 * output PHDR is sticky. If @phdr is specified, the next output 1072 * section in the linker script will go there too. @phdr should have 1073 * a leading colon. 1074 * 1075 * Note that this macros defines __per_cpu_load as an absolute symbol. 1076 * If there is no need to put the percpu section at a predetermined 1077 * address, use PERCPU_SECTION. 1078 */ 1079 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 1080 __per_cpu_load = .; \ 1081 .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \ 1082 PERCPU_INPUT(cacheline) \ 1083 } phdr \ 1084 . = __per_cpu_load + SIZEOF(.data..percpu); 1085 1086 /** 1087 * PERCPU_SECTION - define output section for percpu area, simple version 1088 * @cacheline: cacheline size 1089 * 1090 * Align to PAGE_SIZE and outputs output section for percpu area. This 1091 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 1092 * __per_cpu_start will be identical. 1093 * 1094 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 1095 * except that __per_cpu_load is defined as a relative symbol against 1096 * .data..percpu which is required for relocatable x86_32 configuration. 1097 */ 1098 #define PERCPU_SECTION(cacheline) \ 1099 . = ALIGN(PAGE_SIZE); \ 1100 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 1101 __per_cpu_load = .; \ 1102 PERCPU_INPUT(cacheline) \ 1103 } 1104 1105 1106 /* 1107 * Definition of the high level *_SECTION macros 1108 * They will fit only a subset of the architectures 1109 */ 1110 1111 1112 /* 1113 * Writeable data. 1114 * All sections are combined in a single .data section. 1115 * The sections following CONSTRUCTORS are arranged so their 1116 * typical alignment matches. 1117 * A cacheline is typical/always less than a PAGE_SIZE so 1118 * the sections that has this restriction (or similar) 1119 * is located before the ones requiring PAGE_SIZE alignment. 1120 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 1121 * matches the requirement of PAGE_ALIGNED_DATA. 1122 * 1123 * use 0 as page_align if page_aligned data is not used */ 1124 #define RW_DATA(cacheline, pagealigned, inittask) \ 1125 . = ALIGN(PAGE_SIZE); \ 1126 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 1127 INIT_TASK_DATA(inittask) \ 1128 NOSAVE_DATA \ 1129 PAGE_ALIGNED_DATA(pagealigned) \ 1130 CACHELINE_ALIGNED_DATA(cacheline) \ 1131 READ_MOSTLY_DATA(cacheline) \ 1132 DATA_DATA \ 1133 CONSTRUCTORS \ 1134 } \ 1135 BUG_TABLE \ 1136 1137 #define INIT_TEXT_SECTION(inittext_align) \ 1138 . = ALIGN(inittext_align); \ 1139 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 1140 _sinittext = .; \ 1141 INIT_TEXT \ 1142 _einittext = .; \ 1143 } 1144 1145 #define INIT_DATA_SECTION(initsetup_align) \ 1146 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 1147 INIT_DATA \ 1148 INIT_SETUP(initsetup_align) \ 1149 INIT_CALLS \ 1150 CON_INITCALL \ 1151 INIT_RAM_FS \ 1152 } 1153 1154 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 1155 . = ALIGN(sbss_align); \ 1156 __bss_start = .; \ 1157 SBSS(sbss_align) \ 1158 BSS(bss_align) \ 1159 . = ALIGN(stop_align); \ 1160 __bss_stop = .; 1161