1 /* 2 * Helper macros to support writing architecture specific 3 * linker scripts. 4 * 5 * A minimal linker scripts has following content: 6 * [This is a sample, architectures may have special requiriements] 7 * 8 * OUTPUT_FORMAT(...) 9 * OUTPUT_ARCH(...) 10 * ENTRY(...) 11 * SECTIONS 12 * { 13 * . = START; 14 * __init_begin = .; 15 * HEAD_TEXT_SECTION 16 * INIT_TEXT_SECTION(PAGE_SIZE) 17 * INIT_DATA_SECTION(...) 18 * PERCPU_SECTION(CACHELINE_SIZE) 19 * __init_end = .; 20 * 21 * _stext = .; 22 * TEXT_SECTION = 0 23 * _etext = .; 24 * 25 * _sdata = .; 26 * RO_DATA(PAGE_SIZE) 27 * RW_DATA(...) 28 * _edata = .; 29 * 30 * EXCEPTION_TABLE(...) 31 * 32 * BSS_SECTION(0, 0, 0) 33 * _end = .; 34 * 35 * STABS_DEBUG 36 * DWARF_DEBUG 37 * ELF_DETAILS 38 * 39 * DISCARDS // must be the last 40 * } 41 * 42 * [__init_begin, __init_end] is the init section that may be freed after init 43 * // __init_begin and __init_end should be page aligned, so that we can 44 * // free the whole .init memory 45 * [_stext, _etext] is the text section 46 * [_sdata, _edata] is the data section 47 * 48 * Some of the included output section have their own set of constants. 49 * Examples are: [__initramfs_start, __initramfs_end] for initramfs and 50 * [__nosave_begin, __nosave_end] for the nosave data 51 */ 52 53 #ifndef LOAD_OFFSET 54 #define LOAD_OFFSET 0 55 #endif 56 57 /* 58 * Only some architectures want to have the .notes segment visible in 59 * a separate PT_NOTE ELF Program Header. When this happens, it needs 60 * to be visible in both the kernel text's PT_LOAD and the PT_NOTE 61 * Program Headers. In this case, though, the PT_LOAD needs to be made 62 * the default again so that all the following sections don't also end 63 * up in the PT_NOTE Program Header. 64 */ 65 #ifdef EMITS_PT_NOTE 66 #define NOTES_HEADERS :text :note 67 #define NOTES_HEADERS_RESTORE __restore_ph : { *(.__restore_ph) } :text 68 #else 69 #define NOTES_HEADERS 70 #define NOTES_HEADERS_RESTORE 71 #endif 72 73 /* 74 * Some architectures have non-executable read-only exception tables. 75 * They can be added to the RO_DATA segment by specifying their desired 76 * alignment. 77 */ 78 #ifdef RO_EXCEPTION_TABLE_ALIGN 79 #define RO_EXCEPTION_TABLE EXCEPTION_TABLE(RO_EXCEPTION_TABLE_ALIGN) 80 #else 81 #define RO_EXCEPTION_TABLE 82 #endif 83 84 /* Align . function alignment. */ 85 #define ALIGN_FUNCTION() . = ALIGN(CONFIG_FUNCTION_ALIGNMENT) 86 87 /* 88 * LD_DEAD_CODE_DATA_ELIMINATION option enables -fdata-sections, which 89 * generates .data.identifier sections, which need to be pulled in with 90 * .data. We don't want to pull in .data..other sections, which Linux 91 * has defined. Same for text and bss. 92 * 93 * With LTO_CLANG, the linker also splits sections by default, so we need 94 * these macros to combine the sections during the final link. 95 * 96 * RODATA_MAIN is not used because existing code already defines .rodata.x 97 * sections to be brought in with rodata. 98 */ 99 #if defined(CONFIG_LD_DEAD_CODE_DATA_ELIMINATION) || defined(CONFIG_LTO_CLANG) 100 #define TEXT_MAIN .text .text.[0-9a-zA-Z_]* 101 #define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..L* .data..compoundliteral* .data.$__unnamed_* .data.$L* 102 #define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]* 103 #define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]* .rodata..L* 104 #define BSS_MAIN .bss .bss.[0-9a-zA-Z_]* .bss..compoundliteral* 105 #define SBSS_MAIN .sbss .sbss.[0-9a-zA-Z_]* 106 #else 107 #define TEXT_MAIN .text 108 #define DATA_MAIN .data 109 #define SDATA_MAIN .sdata 110 #define RODATA_MAIN .rodata 111 #define BSS_MAIN .bss 112 #define SBSS_MAIN .sbss 113 #endif 114 115 /* 116 * GCC 4.5 and later have a 32 bytes section alignment for structures. 117 * Except GCC 4.9, that feels the need to align on 64 bytes. 118 */ 119 #define STRUCT_ALIGNMENT 32 120 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT) 121 122 /* 123 * The order of the sched class addresses are important, as they are 124 * used to determine the order of the priority of each sched class in 125 * relation to each other. 126 */ 127 #define SCHED_DATA \ 128 STRUCT_ALIGN(); \ 129 __sched_class_highest = .; \ 130 *(__stop_sched_class) \ 131 *(__dl_sched_class) \ 132 *(__rt_sched_class) \ 133 *(__fair_sched_class) \ 134 *(__idle_sched_class) \ 135 __sched_class_lowest = .; 136 137 /* The actual configuration determine if the init/exit sections 138 * are handled as text/data or they can be discarded (which 139 * often happens at runtime) 140 */ 141 142 #if defined(CONFIG_MEMORY_HOTPLUG) 143 #define MEM_KEEP(sec) *(.mem##sec) 144 #define MEM_DISCARD(sec) 145 #else 146 #define MEM_KEEP(sec) 147 #define MEM_DISCARD(sec) *(.mem##sec) 148 #endif 149 150 #ifndef CONFIG_HAVE_DYNAMIC_FTRACE_NO_PATCHABLE 151 #define KEEP_PATCHABLE KEEP(*(__patchable_function_entries)) 152 #define PATCHABLE_DISCARDS 153 #else 154 #define KEEP_PATCHABLE 155 #define PATCHABLE_DISCARDS *(__patchable_function_entries) 156 #endif 157 158 #ifndef CONFIG_ARCH_SUPPORTS_CFI_CLANG 159 /* 160 * Simply points to ftrace_stub, but with the proper protocol. 161 * Defined by the linker script in linux/vmlinux.lds.h 162 */ 163 #define FTRACE_STUB_HACK ftrace_stub_graph = ftrace_stub; 164 #else 165 #define FTRACE_STUB_HACK 166 #endif 167 168 #ifdef CONFIG_FTRACE_MCOUNT_RECORD 169 /* 170 * The ftrace call sites are logged to a section whose name depends on the 171 * compiler option used. A given kernel image will only use one, AKA 172 * FTRACE_CALLSITE_SECTION. We capture all of them here to avoid header 173 * dependencies for FTRACE_CALLSITE_SECTION's definition. 174 * 175 * ftrace_ops_list_func will be defined as arch_ftrace_ops_list_func 176 * as some archs will have a different prototype for that function 177 * but ftrace_ops_list_func() will have a single prototype. 178 */ 179 #define MCOUNT_REC() . = ALIGN(8); \ 180 __start_mcount_loc = .; \ 181 KEEP(*(__mcount_loc)) \ 182 KEEP_PATCHABLE \ 183 __stop_mcount_loc = .; \ 184 FTRACE_STUB_HACK \ 185 ftrace_ops_list_func = arch_ftrace_ops_list_func; 186 #else 187 # ifdef CONFIG_FUNCTION_TRACER 188 # define MCOUNT_REC() FTRACE_STUB_HACK \ 189 ftrace_ops_list_func = arch_ftrace_ops_list_func; 190 # else 191 # define MCOUNT_REC() 192 # endif 193 #endif 194 195 #define BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_) \ 196 _BEGIN_##_label_ = .; \ 197 KEEP(*(_sec_)) \ 198 _END_##_label_ = .; 199 200 #define BOUNDED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_) \ 201 _label_##_BEGIN_ = .; \ 202 KEEP(*(_sec_)) \ 203 _label_##_END_ = .; 204 205 #define BOUNDED_SECTION_BY(_sec_, _label_) \ 206 BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, __start, __stop) 207 208 #define BOUNDED_SECTION(_sec) BOUNDED_SECTION_BY(_sec, _sec) 209 210 #define HEADERED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_, _HDR_) \ 211 _HDR_##_label_ = .; \ 212 KEEP(*(.gnu.linkonce.##_sec_)) \ 213 BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_) 214 215 #define HEADERED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_, _HDR_) \ 216 _label_##_HDR_ = .; \ 217 KEEP(*(.gnu.linkonce.##_sec_)) \ 218 BOUNDED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_) 219 220 #define HEADERED_SECTION_BY(_sec_, _label_) \ 221 HEADERED_SECTION_PRE_LABEL(_sec_, _label_, __start, __stop) 222 223 #define HEADERED_SECTION(_sec) HEADERED_SECTION_BY(_sec, _sec) 224 225 #ifdef CONFIG_TRACE_BRANCH_PROFILING 226 #define LIKELY_PROFILE() \ 227 BOUNDED_SECTION_BY(_ftrace_annotated_branch, _annotated_branch_profile) 228 #else 229 #define LIKELY_PROFILE() 230 #endif 231 232 #ifdef CONFIG_PROFILE_ALL_BRANCHES 233 #define BRANCH_PROFILE() \ 234 BOUNDED_SECTION_BY(_ftrace_branch, _branch_profile) 235 #else 236 #define BRANCH_PROFILE() 237 #endif 238 239 #ifdef CONFIG_KPROBES 240 #define KPROBE_BLACKLIST() \ 241 . = ALIGN(8); \ 242 BOUNDED_SECTION(_kprobe_blacklist) 243 #else 244 #define KPROBE_BLACKLIST() 245 #endif 246 247 #ifdef CONFIG_FUNCTION_ERROR_INJECTION 248 #define ERROR_INJECT_WHITELIST() \ 249 STRUCT_ALIGN(); \ 250 BOUNDED_SECTION(_error_injection_whitelist) 251 #else 252 #define ERROR_INJECT_WHITELIST() 253 #endif 254 255 #ifdef CONFIG_EVENT_TRACING 256 #define FTRACE_EVENTS() \ 257 . = ALIGN(8); \ 258 BOUNDED_SECTION(_ftrace_events) \ 259 BOUNDED_SECTION_BY(_ftrace_eval_map, _ftrace_eval_maps) 260 #else 261 #define FTRACE_EVENTS() 262 #endif 263 264 #ifdef CONFIG_TRACING 265 #define TRACE_PRINTKS() BOUNDED_SECTION_BY(__trace_printk_fmt, ___trace_bprintk_fmt) 266 #define TRACEPOINT_STR() BOUNDED_SECTION_BY(__tracepoint_str, ___tracepoint_str) 267 #else 268 #define TRACE_PRINTKS() 269 #define TRACEPOINT_STR() 270 #endif 271 272 #ifdef CONFIG_FTRACE_SYSCALLS 273 #define TRACE_SYSCALLS() \ 274 . = ALIGN(8); \ 275 BOUNDED_SECTION_BY(__syscalls_metadata, _syscalls_metadata) 276 #else 277 #define TRACE_SYSCALLS() 278 #endif 279 280 #ifdef CONFIG_BPF_EVENTS 281 #define BPF_RAW_TP() STRUCT_ALIGN(); \ 282 BOUNDED_SECTION_BY(__bpf_raw_tp_map, __bpf_raw_tp) 283 #else 284 #define BPF_RAW_TP() 285 #endif 286 287 #ifdef CONFIG_SERIAL_EARLYCON 288 #define EARLYCON_TABLE() \ 289 . = ALIGN(8); \ 290 BOUNDED_SECTION_POST_LABEL(__earlycon_table, __earlycon_table, , _end) 291 #else 292 #define EARLYCON_TABLE() 293 #endif 294 295 #ifdef CONFIG_SECURITY 296 #define LSM_TABLE() \ 297 . = ALIGN(8); \ 298 BOUNDED_SECTION_PRE_LABEL(.lsm_info.init, _lsm_info, __start, __end) 299 300 #define EARLY_LSM_TABLE() \ 301 . = ALIGN(8); \ 302 BOUNDED_SECTION_PRE_LABEL(.early_lsm_info.init, _early_lsm_info, __start, __end) 303 #else 304 #define LSM_TABLE() 305 #define EARLY_LSM_TABLE() 306 #endif 307 308 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name) 309 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name) 310 #define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name) 311 #define _OF_TABLE_0(name) 312 #define _OF_TABLE_1(name) \ 313 . = ALIGN(8); \ 314 __##name##_of_table = .; \ 315 KEEP(*(__##name##_of_table)) \ 316 KEEP(*(__##name##_of_table_end)) 317 318 #define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer) 319 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip) 320 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk) 321 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem) 322 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method) 323 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method) 324 325 #ifdef CONFIG_ACPI 326 #define ACPI_PROBE_TABLE(name) \ 327 . = ALIGN(8); \ 328 BOUNDED_SECTION_POST_LABEL(__##name##_acpi_probe_table, \ 329 __##name##_acpi_probe_table,, _end) 330 #else 331 #define ACPI_PROBE_TABLE(name) 332 #endif 333 334 #ifdef CONFIG_THERMAL 335 #define THERMAL_TABLE(name) \ 336 . = ALIGN(8); \ 337 BOUNDED_SECTION_POST_LABEL(__##name##_thermal_table, \ 338 __##name##_thermal_table,, _end) 339 #else 340 #define THERMAL_TABLE(name) 341 #endif 342 343 #define KERNEL_DTB() \ 344 STRUCT_ALIGN(); \ 345 __dtb_start = .; \ 346 KEEP(*(.dtb.init.rodata)) \ 347 __dtb_end = .; 348 349 /* 350 * .data section 351 */ 352 #define DATA_DATA \ 353 *(.xiptext) \ 354 *(DATA_MAIN) \ 355 *(.data..decrypted) \ 356 *(.ref.data) \ 357 *(.data..shared_aligned) /* percpu related */ \ 358 MEM_KEEP(init.data*) \ 359 *(.data.unlikely) \ 360 __start_once = .; \ 361 *(.data.once) \ 362 __end_once = .; \ 363 STRUCT_ALIGN(); \ 364 *(__tracepoints) \ 365 /* implement dynamic printk debug */ \ 366 . = ALIGN(8); \ 367 BOUNDED_SECTION_BY(__dyndbg_classes, ___dyndbg_classes) \ 368 BOUNDED_SECTION_BY(__dyndbg, ___dyndbg) \ 369 LIKELY_PROFILE() \ 370 BRANCH_PROFILE() \ 371 TRACE_PRINTKS() \ 372 BPF_RAW_TP() \ 373 TRACEPOINT_STR() \ 374 KUNIT_TABLE() 375 376 /* 377 * Data section helpers 378 */ 379 #define NOSAVE_DATA \ 380 . = ALIGN(PAGE_SIZE); \ 381 __nosave_begin = .; \ 382 *(.data..nosave) \ 383 . = ALIGN(PAGE_SIZE); \ 384 __nosave_end = .; 385 386 #define PAGE_ALIGNED_DATA(page_align) \ 387 . = ALIGN(page_align); \ 388 *(.data..page_aligned) \ 389 . = ALIGN(page_align); 390 391 #define READ_MOSTLY_DATA(align) \ 392 . = ALIGN(align); \ 393 *(.data..read_mostly) \ 394 . = ALIGN(align); 395 396 #define CACHELINE_ALIGNED_DATA(align) \ 397 . = ALIGN(align); \ 398 *(.data..cacheline_aligned) 399 400 #define INIT_TASK_DATA(align) \ 401 . = ALIGN(align); \ 402 __start_init_task = .; \ 403 init_thread_union = .; \ 404 init_stack = .; \ 405 KEEP(*(.data..init_task)) \ 406 KEEP(*(.data..init_thread_info)) \ 407 . = __start_init_task + THREAD_SIZE; \ 408 __end_init_task = .; 409 410 #define JUMP_TABLE_DATA \ 411 . = ALIGN(8); \ 412 BOUNDED_SECTION_BY(__jump_table, ___jump_table) 413 414 #ifdef CONFIG_HAVE_STATIC_CALL_INLINE 415 #define STATIC_CALL_DATA \ 416 . = ALIGN(8); \ 417 BOUNDED_SECTION_BY(.static_call_sites, _static_call_sites) \ 418 BOUNDED_SECTION_BY(.static_call_tramp_key, _static_call_tramp_key) 419 #else 420 #define STATIC_CALL_DATA 421 #endif 422 423 /* 424 * Allow architectures to handle ro_after_init data on their 425 * own by defining an empty RO_AFTER_INIT_DATA. 426 */ 427 #ifndef RO_AFTER_INIT_DATA 428 #define RO_AFTER_INIT_DATA \ 429 . = ALIGN(8); \ 430 __start_ro_after_init = .; \ 431 *(.data..ro_after_init) \ 432 JUMP_TABLE_DATA \ 433 STATIC_CALL_DATA \ 434 __end_ro_after_init = .; 435 #endif 436 437 /* 438 * .kcfi_traps contains a list KCFI trap locations. 439 */ 440 #ifndef KCFI_TRAPS 441 #ifdef CONFIG_ARCH_USES_CFI_TRAPS 442 #define KCFI_TRAPS \ 443 __kcfi_traps : AT(ADDR(__kcfi_traps) - LOAD_OFFSET) { \ 444 BOUNDED_SECTION_BY(.kcfi_traps, ___kcfi_traps) \ 445 } 446 #else 447 #define KCFI_TRAPS 448 #endif 449 #endif 450 451 /* 452 * Read only Data 453 */ 454 #define RO_DATA(align) \ 455 . = ALIGN((align)); \ 456 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 457 __start_rodata = .; \ 458 *(.rodata) *(.rodata.*) \ 459 SCHED_DATA \ 460 RO_AFTER_INIT_DATA /* Read only after init */ \ 461 . = ALIGN(8); \ 462 BOUNDED_SECTION_BY(__tracepoints_ptrs, ___tracepoints_ptrs) \ 463 *(__tracepoints_strings)/* Tracepoints: strings */ \ 464 } \ 465 \ 466 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 467 *(.rodata1) \ 468 } \ 469 \ 470 /* PCI quirks */ \ 471 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 472 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_early, _pci_fixups_early, __start, __end) \ 473 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_header, _pci_fixups_header, __start, __end) \ 474 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_final, _pci_fixups_final, __start, __end) \ 475 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_enable, _pci_fixups_enable, __start, __end) \ 476 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_resume, _pci_fixups_resume, __start, __end) \ 477 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_suspend, _pci_fixups_suspend, __start, __end) \ 478 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_resume_early, _pci_fixups_resume_early, __start, __end) \ 479 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_suspend_late, _pci_fixups_suspend_late, __start, __end) \ 480 } \ 481 \ 482 FW_LOADER_BUILT_IN_DATA \ 483 TRACEDATA \ 484 \ 485 PRINTK_INDEX \ 486 \ 487 /* Kernel symbol table: Normal symbols */ \ 488 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 489 __start___ksymtab = .; \ 490 KEEP(*(SORT(___ksymtab+*))) \ 491 __stop___ksymtab = .; \ 492 } \ 493 \ 494 /* Kernel symbol table: GPL-only symbols */ \ 495 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 496 __start___ksymtab_gpl = .; \ 497 KEEP(*(SORT(___ksymtab_gpl+*))) \ 498 __stop___ksymtab_gpl = .; \ 499 } \ 500 \ 501 /* Kernel symbol table: Normal symbols */ \ 502 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 503 __start___kcrctab = .; \ 504 KEEP(*(SORT(___kcrctab+*))) \ 505 __stop___kcrctab = .; \ 506 } \ 507 \ 508 /* Kernel symbol table: GPL-only symbols */ \ 509 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 510 __start___kcrctab_gpl = .; \ 511 KEEP(*(SORT(___kcrctab_gpl+*))) \ 512 __stop___kcrctab_gpl = .; \ 513 } \ 514 \ 515 /* Kernel symbol table: strings */ \ 516 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 517 *(__ksymtab_strings) \ 518 } \ 519 \ 520 /* __*init sections */ \ 521 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 522 *(.ref.rodata) \ 523 MEM_KEEP(init.rodata) \ 524 } \ 525 \ 526 /* Built-in module parameters. */ \ 527 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 528 BOUNDED_SECTION_BY(__param, ___param) \ 529 } \ 530 \ 531 /* Built-in module versions. */ \ 532 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 533 BOUNDED_SECTION_BY(__modver, ___modver) \ 534 } \ 535 \ 536 KCFI_TRAPS \ 537 \ 538 RO_EXCEPTION_TABLE \ 539 NOTES \ 540 BTF \ 541 \ 542 . = ALIGN((align)); \ 543 __end_rodata = .; 544 545 546 /* 547 * Non-instrumentable text section 548 */ 549 #define NOINSTR_TEXT \ 550 ALIGN_FUNCTION(); \ 551 __noinstr_text_start = .; \ 552 *(.noinstr.text) \ 553 __cpuidle_text_start = .; \ 554 *(.cpuidle.text) \ 555 __cpuidle_text_end = .; \ 556 __noinstr_text_end = .; 557 558 /* 559 * .text section. Map to function alignment to avoid address changes 560 * during second ld run in second ld pass when generating System.map 561 * 562 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead 563 * code elimination is enabled, so these sections should be converted 564 * to use ".." first. 565 */ 566 #define TEXT_TEXT \ 567 ALIGN_FUNCTION(); \ 568 *(.text.hot .text.hot.*) \ 569 *(TEXT_MAIN .text.fixup) \ 570 *(.text.unlikely .text.unlikely.*) \ 571 *(.text.unknown .text.unknown.*) \ 572 NOINSTR_TEXT \ 573 *(.ref.text) \ 574 *(.text.asan.* .text.tsan.*) \ 575 MEM_KEEP(init.text*) \ 576 577 578 /* sched.text is aling to function alignment to secure we have same 579 * address even at second ld pass when generating System.map */ 580 #define SCHED_TEXT \ 581 ALIGN_FUNCTION(); \ 582 __sched_text_start = .; \ 583 *(.sched.text) \ 584 __sched_text_end = .; 585 586 /* spinlock.text is aling to function alignment to secure we have same 587 * address even at second ld pass when generating System.map */ 588 #define LOCK_TEXT \ 589 ALIGN_FUNCTION(); \ 590 __lock_text_start = .; \ 591 *(.spinlock.text) \ 592 __lock_text_end = .; 593 594 #define KPROBES_TEXT \ 595 ALIGN_FUNCTION(); \ 596 __kprobes_text_start = .; \ 597 *(.kprobes.text) \ 598 __kprobes_text_end = .; 599 600 #define ENTRY_TEXT \ 601 ALIGN_FUNCTION(); \ 602 __entry_text_start = .; \ 603 *(.entry.text) \ 604 __entry_text_end = .; 605 606 #define IRQENTRY_TEXT \ 607 ALIGN_FUNCTION(); \ 608 __irqentry_text_start = .; \ 609 *(.irqentry.text) \ 610 __irqentry_text_end = .; 611 612 #define SOFTIRQENTRY_TEXT \ 613 ALIGN_FUNCTION(); \ 614 __softirqentry_text_start = .; \ 615 *(.softirqentry.text) \ 616 __softirqentry_text_end = .; 617 618 #define STATIC_CALL_TEXT \ 619 ALIGN_FUNCTION(); \ 620 __static_call_text_start = .; \ 621 *(.static_call.text) \ 622 __static_call_text_end = .; 623 624 /* Section used for early init (in .S files) */ 625 #define HEAD_TEXT KEEP(*(.head.text)) 626 627 #define HEAD_TEXT_SECTION \ 628 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 629 HEAD_TEXT \ 630 } 631 632 /* 633 * Exception table 634 */ 635 #define EXCEPTION_TABLE(align) \ 636 . = ALIGN(align); \ 637 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 638 BOUNDED_SECTION_BY(__ex_table, ___ex_table) \ 639 } 640 641 /* 642 * .BTF 643 */ 644 #ifdef CONFIG_DEBUG_INFO_BTF 645 #define BTF \ 646 .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \ 647 BOUNDED_SECTION_BY(.BTF, _BTF) \ 648 } \ 649 . = ALIGN(4); \ 650 .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) { \ 651 *(.BTF_ids) \ 652 } 653 #else 654 #define BTF 655 #endif 656 657 /* 658 * Init task 659 */ 660 #define INIT_TASK_DATA_SECTION(align) \ 661 . = ALIGN(align); \ 662 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 663 INIT_TASK_DATA(align) \ 664 } 665 666 #ifdef CONFIG_CONSTRUCTORS 667 #define KERNEL_CTORS() . = ALIGN(8); \ 668 __ctors_start = .; \ 669 KEEP(*(SORT(.ctors.*))) \ 670 KEEP(*(.ctors)) \ 671 KEEP(*(SORT(.init_array.*))) \ 672 KEEP(*(.init_array)) \ 673 __ctors_end = .; 674 #else 675 #define KERNEL_CTORS() 676 #endif 677 678 /* init and exit section handling */ 679 #define INIT_DATA \ 680 KEEP(*(SORT(___kentry+*))) \ 681 *(.init.data .init.data.*) \ 682 MEM_DISCARD(init.data*) \ 683 KERNEL_CTORS() \ 684 MCOUNT_REC() \ 685 *(.init.rodata .init.rodata.*) \ 686 FTRACE_EVENTS() \ 687 TRACE_SYSCALLS() \ 688 KPROBE_BLACKLIST() \ 689 ERROR_INJECT_WHITELIST() \ 690 MEM_DISCARD(init.rodata) \ 691 CLK_OF_TABLES() \ 692 RESERVEDMEM_OF_TABLES() \ 693 TIMER_OF_TABLES() \ 694 CPU_METHOD_OF_TABLES() \ 695 CPUIDLE_METHOD_OF_TABLES() \ 696 KERNEL_DTB() \ 697 IRQCHIP_OF_MATCH_TABLE() \ 698 ACPI_PROBE_TABLE(irqchip) \ 699 ACPI_PROBE_TABLE(timer) \ 700 THERMAL_TABLE(governor) \ 701 EARLYCON_TABLE() \ 702 LSM_TABLE() \ 703 EARLY_LSM_TABLE() \ 704 KUNIT_INIT_TABLE() 705 706 #define INIT_TEXT \ 707 *(.init.text .init.text.*) \ 708 *(.text.startup) \ 709 MEM_DISCARD(init.text*) 710 711 #define EXIT_DATA \ 712 *(.exit.data .exit.data.*) \ 713 *(.fini_array .fini_array.*) \ 714 *(.dtors .dtors.*) \ 715 716 #define EXIT_TEXT \ 717 *(.exit.text) \ 718 *(.text.exit) \ 719 720 #define EXIT_CALL \ 721 *(.exitcall.exit) 722 723 /* 724 * bss (Block Started by Symbol) - uninitialized data 725 * zeroed during startup 726 */ 727 #define SBSS(sbss_align) \ 728 . = ALIGN(sbss_align); \ 729 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 730 *(.dynsbss) \ 731 *(SBSS_MAIN) \ 732 *(.scommon) \ 733 } 734 735 /* 736 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 737 * sections to the front of bss. 738 */ 739 #ifndef BSS_FIRST_SECTIONS 740 #define BSS_FIRST_SECTIONS 741 #endif 742 743 #define BSS(bss_align) \ 744 . = ALIGN(bss_align); \ 745 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 746 BSS_FIRST_SECTIONS \ 747 . = ALIGN(PAGE_SIZE); \ 748 *(.bss..page_aligned) \ 749 . = ALIGN(PAGE_SIZE); \ 750 *(.dynbss) \ 751 *(BSS_MAIN) \ 752 *(COMMON) \ 753 } 754 755 /* 756 * DWARF debug sections. 757 * Symbols in the DWARF debugging sections are relative to 758 * the beginning of the section so we begin them at 0. 759 */ 760 #define DWARF_DEBUG \ 761 /* DWARF 1 */ \ 762 .debug 0 : { *(.debug) } \ 763 .line 0 : { *(.line) } \ 764 /* GNU DWARF 1 extensions */ \ 765 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 766 .debug_sfnames 0 : { *(.debug_sfnames) } \ 767 /* DWARF 1.1 and DWARF 2 */ \ 768 .debug_aranges 0 : { *(.debug_aranges) } \ 769 .debug_pubnames 0 : { *(.debug_pubnames) } \ 770 /* DWARF 2 */ \ 771 .debug_info 0 : { *(.debug_info \ 772 .gnu.linkonce.wi.*) } \ 773 .debug_abbrev 0 : { *(.debug_abbrev) } \ 774 .debug_line 0 : { *(.debug_line) } \ 775 .debug_frame 0 : { *(.debug_frame) } \ 776 .debug_str 0 : { *(.debug_str) } \ 777 .debug_loc 0 : { *(.debug_loc) } \ 778 .debug_macinfo 0 : { *(.debug_macinfo) } \ 779 .debug_pubtypes 0 : { *(.debug_pubtypes) } \ 780 /* DWARF 3 */ \ 781 .debug_ranges 0 : { *(.debug_ranges) } \ 782 /* SGI/MIPS DWARF 2 extensions */ \ 783 .debug_weaknames 0 : { *(.debug_weaknames) } \ 784 .debug_funcnames 0 : { *(.debug_funcnames) } \ 785 .debug_typenames 0 : { *(.debug_typenames) } \ 786 .debug_varnames 0 : { *(.debug_varnames) } \ 787 /* GNU DWARF 2 extensions */ \ 788 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \ 789 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \ 790 /* DWARF 4 */ \ 791 .debug_types 0 : { *(.debug_types) } \ 792 /* DWARF 5 */ \ 793 .debug_addr 0 : { *(.debug_addr) } \ 794 .debug_line_str 0 : { *(.debug_line_str) } \ 795 .debug_loclists 0 : { *(.debug_loclists) } \ 796 .debug_macro 0 : { *(.debug_macro) } \ 797 .debug_names 0 : { *(.debug_names) } \ 798 .debug_rnglists 0 : { *(.debug_rnglists) } \ 799 .debug_str_offsets 0 : { *(.debug_str_offsets) } 800 801 /* Stabs debugging sections. */ 802 #define STABS_DEBUG \ 803 .stab 0 : { *(.stab) } \ 804 .stabstr 0 : { *(.stabstr) } \ 805 .stab.excl 0 : { *(.stab.excl) } \ 806 .stab.exclstr 0 : { *(.stab.exclstr) } \ 807 .stab.index 0 : { *(.stab.index) } \ 808 .stab.indexstr 0 : { *(.stab.indexstr) } 809 810 /* Required sections not related to debugging. */ 811 #define ELF_DETAILS \ 812 .comment 0 : { *(.comment) } \ 813 .symtab 0 : { *(.symtab) } \ 814 .strtab 0 : { *(.strtab) } \ 815 .shstrtab 0 : { *(.shstrtab) } 816 817 #ifdef CONFIG_GENERIC_BUG 818 #define BUG_TABLE \ 819 . = ALIGN(8); \ 820 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 821 BOUNDED_SECTION_BY(__bug_table, ___bug_table) \ 822 } 823 #else 824 #define BUG_TABLE 825 #endif 826 827 #ifdef CONFIG_UNWINDER_ORC 828 #define ORC_UNWIND_TABLE \ 829 .orc_header : AT(ADDR(.orc_header) - LOAD_OFFSET) { \ 830 BOUNDED_SECTION_BY(.orc_header, _orc_header) \ 831 } \ 832 . = ALIGN(4); \ 833 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \ 834 BOUNDED_SECTION_BY(.orc_unwind_ip, _orc_unwind_ip) \ 835 } \ 836 . = ALIGN(2); \ 837 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \ 838 BOUNDED_SECTION_BY(.orc_unwind, _orc_unwind) \ 839 } \ 840 text_size = _etext - _stext; \ 841 . = ALIGN(4); \ 842 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \ 843 orc_lookup = .; \ 844 . += (((text_size + LOOKUP_BLOCK_SIZE - 1) / \ 845 LOOKUP_BLOCK_SIZE) + 1) * 4; \ 846 orc_lookup_end = .; \ 847 } 848 #else 849 #define ORC_UNWIND_TABLE 850 #endif 851 852 /* Built-in firmware blobs */ 853 #ifdef CONFIG_FW_LOADER 854 #define FW_LOADER_BUILT_IN_DATA \ 855 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) { \ 856 BOUNDED_SECTION_PRE_LABEL(.builtin_fw, _builtin_fw, __start, __end) \ 857 } 858 #else 859 #define FW_LOADER_BUILT_IN_DATA 860 #endif 861 862 #ifdef CONFIG_PM_TRACE 863 #define TRACEDATA \ 864 . = ALIGN(4); \ 865 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 866 BOUNDED_SECTION_POST_LABEL(.tracedata, __tracedata, _start, _end) \ 867 } 868 #else 869 #define TRACEDATA 870 #endif 871 872 #ifdef CONFIG_PRINTK_INDEX 873 #define PRINTK_INDEX \ 874 .printk_index : AT(ADDR(.printk_index) - LOAD_OFFSET) { \ 875 BOUNDED_SECTION_BY(.printk_index, _printk_index) \ 876 } 877 #else 878 #define PRINTK_INDEX 879 #endif 880 881 /* 882 * Discard .note.GNU-stack, which is emitted as PROGBITS by the compiler. 883 * Otherwise, the type of .notes section would become PROGBITS instead of NOTES. 884 * 885 * Also, discard .note.gnu.property, otherwise it forces the notes section to 886 * be 8-byte aligned which causes alignment mismatches with the kernel's custom 887 * 4-byte aligned notes. 888 */ 889 #define NOTES \ 890 /DISCARD/ : { \ 891 *(.note.GNU-stack) \ 892 *(.note.gnu.property) \ 893 } \ 894 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 895 BOUNDED_SECTION_BY(.note.*, _notes) \ 896 } NOTES_HEADERS \ 897 NOTES_HEADERS_RESTORE 898 899 #define INIT_SETUP(initsetup_align) \ 900 . = ALIGN(initsetup_align); \ 901 BOUNDED_SECTION_POST_LABEL(.init.setup, __setup, _start, _end) 902 903 #define INIT_CALLS_LEVEL(level) \ 904 __initcall##level##_start = .; \ 905 KEEP(*(.initcall##level##.init)) \ 906 KEEP(*(.initcall##level##s.init)) \ 907 908 #define INIT_CALLS \ 909 __initcall_start = .; \ 910 KEEP(*(.initcallearly.init)) \ 911 INIT_CALLS_LEVEL(0) \ 912 INIT_CALLS_LEVEL(1) \ 913 INIT_CALLS_LEVEL(2) \ 914 INIT_CALLS_LEVEL(3) \ 915 INIT_CALLS_LEVEL(4) \ 916 INIT_CALLS_LEVEL(5) \ 917 INIT_CALLS_LEVEL(rootfs) \ 918 INIT_CALLS_LEVEL(6) \ 919 INIT_CALLS_LEVEL(7) \ 920 __initcall_end = .; 921 922 #define CON_INITCALL \ 923 BOUNDED_SECTION_POST_LABEL(.con_initcall.init, __con_initcall, _start, _end) 924 925 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */ 926 #define KUNIT_TABLE() \ 927 . = ALIGN(8); \ 928 BOUNDED_SECTION_POST_LABEL(.kunit_test_suites, __kunit_suites, _start, _end) 929 930 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */ 931 #define KUNIT_INIT_TABLE() \ 932 . = ALIGN(8); \ 933 BOUNDED_SECTION_POST_LABEL(.kunit_init_test_suites, \ 934 __kunit_init_suites, _start, _end) 935 936 #ifdef CONFIG_BLK_DEV_INITRD 937 #define INIT_RAM_FS \ 938 . = ALIGN(4); \ 939 __initramfs_start = .; \ 940 KEEP(*(.init.ramfs)) \ 941 . = ALIGN(8); \ 942 KEEP(*(.init.ramfs.info)) 943 #else 944 #define INIT_RAM_FS 945 #endif 946 947 /* 948 * Memory encryption operates on a page basis. Since we need to clear 949 * the memory encryption mask for this section, it needs to be aligned 950 * on a page boundary and be a page-size multiple in length. 951 * 952 * Note: We use a separate section so that only this section gets 953 * decrypted to avoid exposing more than we wish. 954 */ 955 #ifdef CONFIG_AMD_MEM_ENCRYPT 956 #define PERCPU_DECRYPTED_SECTION \ 957 . = ALIGN(PAGE_SIZE); \ 958 *(.data..percpu..decrypted) \ 959 . = ALIGN(PAGE_SIZE); 960 #else 961 #define PERCPU_DECRYPTED_SECTION 962 #endif 963 964 965 /* 966 * Default discarded sections. 967 * 968 * Some archs want to discard exit text/data at runtime rather than 969 * link time due to cross-section references such as alt instructions, 970 * bug table, eh_frame, etc. DISCARDS must be the last of output 971 * section definitions so that such archs put those in earlier section 972 * definitions. 973 */ 974 #ifdef RUNTIME_DISCARD_EXIT 975 #define EXIT_DISCARDS 976 #else 977 #define EXIT_DISCARDS \ 978 EXIT_TEXT \ 979 EXIT_DATA 980 #endif 981 982 /* 983 * Clang's -fprofile-arcs, -fsanitize=kernel-address, and 984 * -fsanitize=thread produce unwanted sections (.eh_frame 985 * and .init_array.*), but CONFIG_CONSTRUCTORS wants to 986 * keep any .init_array.* sections. 987 * https://bugs.llvm.org/show_bug.cgi?id=46478 988 */ 989 #ifdef CONFIG_UNWIND_TABLES 990 #define DISCARD_EH_FRAME 991 #else 992 #define DISCARD_EH_FRAME *(.eh_frame) 993 #endif 994 #if defined(CONFIG_GCOV_KERNEL) || defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN) 995 # ifdef CONFIG_CONSTRUCTORS 996 # define SANITIZER_DISCARDS \ 997 DISCARD_EH_FRAME 998 # else 999 # define SANITIZER_DISCARDS \ 1000 *(.init_array) *(.init_array.*) \ 1001 DISCARD_EH_FRAME 1002 # endif 1003 #else 1004 # define SANITIZER_DISCARDS 1005 #endif 1006 1007 #define COMMON_DISCARDS \ 1008 SANITIZER_DISCARDS \ 1009 PATCHABLE_DISCARDS \ 1010 *(.discard) \ 1011 *(.discard.*) \ 1012 *(.export_symbol) \ 1013 *(.modinfo) \ 1014 /* ld.bfd warns about .gnu.version* even when not emitted */ \ 1015 *(.gnu.version*) \ 1016 1017 #define DISCARDS \ 1018 /DISCARD/ : { \ 1019 EXIT_DISCARDS \ 1020 EXIT_CALL \ 1021 COMMON_DISCARDS \ 1022 } 1023 1024 /** 1025 * PERCPU_INPUT - the percpu input sections 1026 * @cacheline: cacheline size 1027 * 1028 * The core percpu section names and core symbols which do not rely 1029 * directly upon load addresses. 1030 * 1031 * @cacheline is used to align subsections to avoid false cacheline 1032 * sharing between subsections for different purposes. 1033 */ 1034 #define PERCPU_INPUT(cacheline) \ 1035 __per_cpu_start = .; \ 1036 *(.data..percpu..first) \ 1037 . = ALIGN(PAGE_SIZE); \ 1038 *(.data..percpu..page_aligned) \ 1039 . = ALIGN(cacheline); \ 1040 *(.data..percpu..read_mostly) \ 1041 . = ALIGN(cacheline); \ 1042 *(.data..percpu) \ 1043 *(.data..percpu..shared_aligned) \ 1044 PERCPU_DECRYPTED_SECTION \ 1045 __per_cpu_end = .; 1046 1047 /** 1048 * PERCPU_VADDR - define output section for percpu area 1049 * @cacheline: cacheline size 1050 * @vaddr: explicit base address (optional) 1051 * @phdr: destination PHDR (optional) 1052 * 1053 * Macro which expands to output section for percpu area. 1054 * 1055 * @cacheline is used to align subsections to avoid false cacheline 1056 * sharing between subsections for different purposes. 1057 * 1058 * If @vaddr is not blank, it specifies explicit base address and all 1059 * percpu symbols will be offset from the given address. If blank, 1060 * @vaddr always equals @laddr + LOAD_OFFSET. 1061 * 1062 * @phdr defines the output PHDR to use if not blank. Be warned that 1063 * output PHDR is sticky. If @phdr is specified, the next output 1064 * section in the linker script will go there too. @phdr should have 1065 * a leading colon. 1066 * 1067 * Note that this macros defines __per_cpu_load as an absolute symbol. 1068 * If there is no need to put the percpu section at a predetermined 1069 * address, use PERCPU_SECTION. 1070 */ 1071 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 1072 __per_cpu_load = .; \ 1073 .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \ 1074 PERCPU_INPUT(cacheline) \ 1075 } phdr \ 1076 . = __per_cpu_load + SIZEOF(.data..percpu); 1077 1078 /** 1079 * PERCPU_SECTION - define output section for percpu area, simple version 1080 * @cacheline: cacheline size 1081 * 1082 * Align to PAGE_SIZE and outputs output section for percpu area. This 1083 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 1084 * __per_cpu_start will be identical. 1085 * 1086 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 1087 * except that __per_cpu_load is defined as a relative symbol against 1088 * .data..percpu which is required for relocatable x86_32 configuration. 1089 */ 1090 #define PERCPU_SECTION(cacheline) \ 1091 . = ALIGN(PAGE_SIZE); \ 1092 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 1093 __per_cpu_load = .; \ 1094 PERCPU_INPUT(cacheline) \ 1095 } 1096 1097 1098 /* 1099 * Definition of the high level *_SECTION macros 1100 * They will fit only a subset of the architectures 1101 */ 1102 1103 1104 /* 1105 * Writeable data. 1106 * All sections are combined in a single .data section. 1107 * The sections following CONSTRUCTORS are arranged so their 1108 * typical alignment matches. 1109 * A cacheline is typical/always less than a PAGE_SIZE so 1110 * the sections that has this restriction (or similar) 1111 * is located before the ones requiring PAGE_SIZE alignment. 1112 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 1113 * matches the requirement of PAGE_ALIGNED_DATA. 1114 * 1115 * use 0 as page_align if page_aligned data is not used */ 1116 #define RW_DATA(cacheline, pagealigned, inittask) \ 1117 . = ALIGN(PAGE_SIZE); \ 1118 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 1119 INIT_TASK_DATA(inittask) \ 1120 NOSAVE_DATA \ 1121 PAGE_ALIGNED_DATA(pagealigned) \ 1122 CACHELINE_ALIGNED_DATA(cacheline) \ 1123 READ_MOSTLY_DATA(cacheline) \ 1124 DATA_DATA \ 1125 CONSTRUCTORS \ 1126 } \ 1127 BUG_TABLE \ 1128 1129 #define INIT_TEXT_SECTION(inittext_align) \ 1130 . = ALIGN(inittext_align); \ 1131 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 1132 _sinittext = .; \ 1133 INIT_TEXT \ 1134 _einittext = .; \ 1135 } 1136 1137 #define INIT_DATA_SECTION(initsetup_align) \ 1138 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 1139 INIT_DATA \ 1140 INIT_SETUP(initsetup_align) \ 1141 INIT_CALLS \ 1142 CON_INITCALL \ 1143 INIT_RAM_FS \ 1144 } 1145 1146 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 1147 . = ALIGN(sbss_align); \ 1148 __bss_start = .; \ 1149 SBSS(sbss_align) \ 1150 BSS(bss_align) \ 1151 . = ALIGN(stop_align); \ 1152 __bss_stop = .; 1153