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() 374 375 /* 376 * Data section helpers 377 */ 378 #define NOSAVE_DATA \ 379 . = ALIGN(PAGE_SIZE); \ 380 __nosave_begin = .; \ 381 *(.data..nosave) \ 382 . = ALIGN(PAGE_SIZE); \ 383 __nosave_end = .; 384 385 #define PAGE_ALIGNED_DATA(page_align) \ 386 . = ALIGN(page_align); \ 387 *(.data..page_aligned) \ 388 . = ALIGN(page_align); 389 390 #define READ_MOSTLY_DATA(align) \ 391 . = ALIGN(align); \ 392 *(.data..read_mostly) \ 393 . = ALIGN(align); 394 395 #define CACHELINE_ALIGNED_DATA(align) \ 396 . = ALIGN(align); \ 397 *(.data..cacheline_aligned) 398 399 #define INIT_TASK_DATA(align) \ 400 . = ALIGN(align); \ 401 __start_init_task = .; \ 402 init_thread_union = .; \ 403 init_stack = .; \ 404 KEEP(*(.data..init_task)) \ 405 KEEP(*(.data..init_thread_info)) \ 406 . = __start_init_task + THREAD_SIZE; \ 407 __end_init_task = .; 408 409 #define JUMP_TABLE_DATA \ 410 . = ALIGN(8); \ 411 BOUNDED_SECTION_BY(__jump_table, ___jump_table) 412 413 #ifdef CONFIG_HAVE_STATIC_CALL_INLINE 414 #define STATIC_CALL_DATA \ 415 . = ALIGN(8); \ 416 BOUNDED_SECTION_BY(.static_call_sites, _static_call_sites) \ 417 BOUNDED_SECTION_BY(.static_call_tramp_key, _static_call_tramp_key) 418 #else 419 #define STATIC_CALL_DATA 420 #endif 421 422 /* 423 * Allow architectures to handle ro_after_init data on their 424 * own by defining an empty RO_AFTER_INIT_DATA. 425 */ 426 #ifndef RO_AFTER_INIT_DATA 427 #define RO_AFTER_INIT_DATA \ 428 . = ALIGN(8); \ 429 __start_ro_after_init = .; \ 430 *(.data..ro_after_init) \ 431 JUMP_TABLE_DATA \ 432 STATIC_CALL_DATA \ 433 __end_ro_after_init = .; 434 #endif 435 436 /* 437 * .kcfi_traps contains a list KCFI trap locations. 438 */ 439 #ifndef KCFI_TRAPS 440 #ifdef CONFIG_ARCH_USES_CFI_TRAPS 441 #define KCFI_TRAPS \ 442 __kcfi_traps : AT(ADDR(__kcfi_traps) - LOAD_OFFSET) { \ 443 BOUNDED_SECTION_BY(.kcfi_traps, ___kcfi_traps) \ 444 } 445 #else 446 #define KCFI_TRAPS 447 #endif 448 #endif 449 450 /* 451 * Read only Data 452 */ 453 #define RO_DATA(align) \ 454 . = ALIGN((align)); \ 455 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 456 __start_rodata = .; \ 457 *(.rodata) *(.rodata.*) \ 458 SCHED_DATA \ 459 RO_AFTER_INIT_DATA /* Read only after init */ \ 460 . = ALIGN(8); \ 461 BOUNDED_SECTION_BY(__tracepoints_ptrs, ___tracepoints_ptrs) \ 462 *(__tracepoints_strings)/* Tracepoints: strings */ \ 463 } \ 464 \ 465 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 466 *(.rodata1) \ 467 } \ 468 \ 469 /* PCI quirks */ \ 470 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 471 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_early, _pci_fixups_early, __start, __end) \ 472 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_header, _pci_fixups_header, __start, __end) \ 473 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_final, _pci_fixups_final, __start, __end) \ 474 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_enable, _pci_fixups_enable, __start, __end) \ 475 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_resume, _pci_fixups_resume, __start, __end) \ 476 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_suspend, _pci_fixups_suspend, __start, __end) \ 477 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_resume_early, _pci_fixups_resume_early, __start, __end) \ 478 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_suspend_late, _pci_fixups_suspend_late, __start, __end) \ 479 } \ 480 \ 481 FW_LOADER_BUILT_IN_DATA \ 482 TRACEDATA \ 483 \ 484 PRINTK_INDEX \ 485 \ 486 /* Kernel symbol table: Normal symbols */ \ 487 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 488 __start___ksymtab = .; \ 489 KEEP(*(SORT(___ksymtab+*))) \ 490 __stop___ksymtab = .; \ 491 } \ 492 \ 493 /* Kernel symbol table: GPL-only symbols */ \ 494 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 495 __start___ksymtab_gpl = .; \ 496 KEEP(*(SORT(___ksymtab_gpl+*))) \ 497 __stop___ksymtab_gpl = .; \ 498 } \ 499 \ 500 /* Kernel symbol table: Normal symbols */ \ 501 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 502 __start___kcrctab = .; \ 503 KEEP(*(SORT(___kcrctab+*))) \ 504 __stop___kcrctab = .; \ 505 } \ 506 \ 507 /* Kernel symbol table: GPL-only symbols */ \ 508 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 509 __start___kcrctab_gpl = .; \ 510 KEEP(*(SORT(___kcrctab_gpl+*))) \ 511 __stop___kcrctab_gpl = .; \ 512 } \ 513 \ 514 /* Kernel symbol table: strings */ \ 515 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 516 *(__ksymtab_strings) \ 517 } \ 518 \ 519 /* __*init sections */ \ 520 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 521 *(.ref.rodata) \ 522 MEM_KEEP(init.rodata) \ 523 } \ 524 \ 525 /* Built-in module parameters. */ \ 526 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 527 BOUNDED_SECTION_BY(__param, ___param) \ 528 } \ 529 \ 530 /* Built-in module versions. */ \ 531 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 532 BOUNDED_SECTION_BY(__modver, ___modver) \ 533 } \ 534 \ 535 KCFI_TRAPS \ 536 \ 537 RO_EXCEPTION_TABLE \ 538 NOTES \ 539 BTF \ 540 \ 541 . = ALIGN((align)); \ 542 __end_rodata = .; 543 544 545 /* 546 * Non-instrumentable text section 547 */ 548 #define NOINSTR_TEXT \ 549 ALIGN_FUNCTION(); \ 550 __noinstr_text_start = .; \ 551 *(.noinstr.text) \ 552 __cpuidle_text_start = .; \ 553 *(.cpuidle.text) \ 554 __cpuidle_text_end = .; \ 555 __noinstr_text_end = .; 556 557 /* 558 * .text section. Map to function alignment to avoid address changes 559 * during second ld run in second ld pass when generating System.map 560 * 561 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead 562 * code elimination is enabled, so these sections should be converted 563 * to use ".." first. 564 */ 565 #define TEXT_TEXT \ 566 ALIGN_FUNCTION(); \ 567 *(.text.hot .text.hot.*) \ 568 *(TEXT_MAIN .text.fixup) \ 569 *(.text.unlikely .text.unlikely.*) \ 570 *(.text.unknown .text.unknown.*) \ 571 NOINSTR_TEXT \ 572 *(.ref.text) \ 573 *(.text.asan.* .text.tsan.*) \ 574 MEM_KEEP(init.text*) \ 575 576 577 /* sched.text is aling to function alignment to secure we have same 578 * address even at second ld pass when generating System.map */ 579 #define SCHED_TEXT \ 580 ALIGN_FUNCTION(); \ 581 __sched_text_start = .; \ 582 *(.sched.text) \ 583 __sched_text_end = .; 584 585 /* spinlock.text is aling to function alignment to secure we have same 586 * address even at second ld pass when generating System.map */ 587 #define LOCK_TEXT \ 588 ALIGN_FUNCTION(); \ 589 __lock_text_start = .; \ 590 *(.spinlock.text) \ 591 __lock_text_end = .; 592 593 #define KPROBES_TEXT \ 594 ALIGN_FUNCTION(); \ 595 __kprobes_text_start = .; \ 596 *(.kprobes.text) \ 597 __kprobes_text_end = .; 598 599 #define ENTRY_TEXT \ 600 ALIGN_FUNCTION(); \ 601 __entry_text_start = .; \ 602 *(.entry.text) \ 603 __entry_text_end = .; 604 605 #define IRQENTRY_TEXT \ 606 ALIGN_FUNCTION(); \ 607 __irqentry_text_start = .; \ 608 *(.irqentry.text) \ 609 __irqentry_text_end = .; 610 611 #define SOFTIRQENTRY_TEXT \ 612 ALIGN_FUNCTION(); \ 613 __softirqentry_text_start = .; \ 614 *(.softirqentry.text) \ 615 __softirqentry_text_end = .; 616 617 #define STATIC_CALL_TEXT \ 618 ALIGN_FUNCTION(); \ 619 __static_call_text_start = .; \ 620 *(.static_call.text) \ 621 __static_call_text_end = .; 622 623 /* Section used for early init (in .S files) */ 624 #define HEAD_TEXT KEEP(*(.head.text)) 625 626 #define HEAD_TEXT_SECTION \ 627 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 628 HEAD_TEXT \ 629 } 630 631 /* 632 * Exception table 633 */ 634 #define EXCEPTION_TABLE(align) \ 635 . = ALIGN(align); \ 636 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 637 BOUNDED_SECTION_BY(__ex_table, ___ex_table) \ 638 } 639 640 /* 641 * .BTF 642 */ 643 #ifdef CONFIG_DEBUG_INFO_BTF 644 #define BTF \ 645 .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \ 646 BOUNDED_SECTION_BY(.BTF, _BTF) \ 647 } \ 648 . = ALIGN(4); \ 649 .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) { \ 650 *(.BTF_ids) \ 651 } 652 #else 653 #define BTF 654 #endif 655 656 /* 657 * Init task 658 */ 659 #define INIT_TASK_DATA_SECTION(align) \ 660 . = ALIGN(align); \ 661 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 662 INIT_TASK_DATA(align) \ 663 } 664 665 #ifdef CONFIG_CONSTRUCTORS 666 #define KERNEL_CTORS() . = ALIGN(8); \ 667 __ctors_start = .; \ 668 KEEP(*(SORT(.ctors.*))) \ 669 KEEP(*(.ctors)) \ 670 KEEP(*(SORT(.init_array.*))) \ 671 KEEP(*(.init_array)) \ 672 __ctors_end = .; 673 #else 674 #define KERNEL_CTORS() 675 #endif 676 677 /* init and exit section handling */ 678 #define INIT_DATA \ 679 KEEP(*(SORT(___kentry+*))) \ 680 *(.init.data .init.data.*) \ 681 MEM_DISCARD(init.data*) \ 682 KERNEL_CTORS() \ 683 MCOUNT_REC() \ 684 *(.init.rodata .init.rodata.*) \ 685 FTRACE_EVENTS() \ 686 TRACE_SYSCALLS() \ 687 KPROBE_BLACKLIST() \ 688 ERROR_INJECT_WHITELIST() \ 689 MEM_DISCARD(init.rodata) \ 690 CLK_OF_TABLES() \ 691 RESERVEDMEM_OF_TABLES() \ 692 TIMER_OF_TABLES() \ 693 CPU_METHOD_OF_TABLES() \ 694 CPUIDLE_METHOD_OF_TABLES() \ 695 KERNEL_DTB() \ 696 IRQCHIP_OF_MATCH_TABLE() \ 697 ACPI_PROBE_TABLE(irqchip) \ 698 ACPI_PROBE_TABLE(timer) \ 699 THERMAL_TABLE(governor) \ 700 EARLYCON_TABLE() \ 701 LSM_TABLE() \ 702 EARLY_LSM_TABLE() \ 703 KUNIT_TABLE() 704 705 #define INIT_TEXT \ 706 *(.init.text .init.text.*) \ 707 *(.text.startup) \ 708 MEM_DISCARD(init.text*) 709 710 #define EXIT_DATA \ 711 *(.exit.data .exit.data.*) \ 712 *(.fini_array .fini_array.*) \ 713 *(.dtors .dtors.*) \ 714 715 #define EXIT_TEXT \ 716 *(.exit.text) \ 717 *(.text.exit) \ 718 719 #define EXIT_CALL \ 720 *(.exitcall.exit) 721 722 /* 723 * bss (Block Started by Symbol) - uninitialized data 724 * zeroed during startup 725 */ 726 #define SBSS(sbss_align) \ 727 . = ALIGN(sbss_align); \ 728 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 729 *(.dynsbss) \ 730 *(SBSS_MAIN) \ 731 *(.scommon) \ 732 } 733 734 /* 735 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 736 * sections to the front of bss. 737 */ 738 #ifndef BSS_FIRST_SECTIONS 739 #define BSS_FIRST_SECTIONS 740 #endif 741 742 #define BSS(bss_align) \ 743 . = ALIGN(bss_align); \ 744 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 745 BSS_FIRST_SECTIONS \ 746 . = ALIGN(PAGE_SIZE); \ 747 *(.bss..page_aligned) \ 748 . = ALIGN(PAGE_SIZE); \ 749 *(.dynbss) \ 750 *(BSS_MAIN) \ 751 *(COMMON) \ 752 } 753 754 /* 755 * DWARF debug sections. 756 * Symbols in the DWARF debugging sections are relative to 757 * the beginning of the section so we begin them at 0. 758 */ 759 #define DWARF_DEBUG \ 760 /* DWARF 1 */ \ 761 .debug 0 : { *(.debug) } \ 762 .line 0 : { *(.line) } \ 763 /* GNU DWARF 1 extensions */ \ 764 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 765 .debug_sfnames 0 : { *(.debug_sfnames) } \ 766 /* DWARF 1.1 and DWARF 2 */ \ 767 .debug_aranges 0 : { *(.debug_aranges) } \ 768 .debug_pubnames 0 : { *(.debug_pubnames) } \ 769 /* DWARF 2 */ \ 770 .debug_info 0 : { *(.debug_info \ 771 .gnu.linkonce.wi.*) } \ 772 .debug_abbrev 0 : { *(.debug_abbrev) } \ 773 .debug_line 0 : { *(.debug_line) } \ 774 .debug_frame 0 : { *(.debug_frame) } \ 775 .debug_str 0 : { *(.debug_str) } \ 776 .debug_loc 0 : { *(.debug_loc) } \ 777 .debug_macinfo 0 : { *(.debug_macinfo) } \ 778 .debug_pubtypes 0 : { *(.debug_pubtypes) } \ 779 /* DWARF 3 */ \ 780 .debug_ranges 0 : { *(.debug_ranges) } \ 781 /* SGI/MIPS DWARF 2 extensions */ \ 782 .debug_weaknames 0 : { *(.debug_weaknames) } \ 783 .debug_funcnames 0 : { *(.debug_funcnames) } \ 784 .debug_typenames 0 : { *(.debug_typenames) } \ 785 .debug_varnames 0 : { *(.debug_varnames) } \ 786 /* GNU DWARF 2 extensions */ \ 787 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \ 788 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \ 789 /* DWARF 4 */ \ 790 .debug_types 0 : { *(.debug_types) } \ 791 /* DWARF 5 */ \ 792 .debug_addr 0 : { *(.debug_addr) } \ 793 .debug_line_str 0 : { *(.debug_line_str) } \ 794 .debug_loclists 0 : { *(.debug_loclists) } \ 795 .debug_macro 0 : { *(.debug_macro) } \ 796 .debug_names 0 : { *(.debug_names) } \ 797 .debug_rnglists 0 : { *(.debug_rnglists) } \ 798 .debug_str_offsets 0 : { *(.debug_str_offsets) } 799 800 /* Stabs debugging sections. */ 801 #define STABS_DEBUG \ 802 .stab 0 : { *(.stab) } \ 803 .stabstr 0 : { *(.stabstr) } \ 804 .stab.excl 0 : { *(.stab.excl) } \ 805 .stab.exclstr 0 : { *(.stab.exclstr) } \ 806 .stab.index 0 : { *(.stab.index) } \ 807 .stab.indexstr 0 : { *(.stab.indexstr) } 808 809 /* Required sections not related to debugging. */ 810 #define ELF_DETAILS \ 811 .comment 0 : { *(.comment) } \ 812 .symtab 0 : { *(.symtab) } \ 813 .strtab 0 : { *(.strtab) } \ 814 .shstrtab 0 : { *(.shstrtab) } 815 816 #ifdef CONFIG_GENERIC_BUG 817 #define BUG_TABLE \ 818 . = ALIGN(8); \ 819 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 820 BOUNDED_SECTION_BY(__bug_table, ___bug_table) \ 821 } 822 #else 823 #define BUG_TABLE 824 #endif 825 826 #ifdef CONFIG_UNWINDER_ORC 827 #define ORC_UNWIND_TABLE \ 828 .orc_header : AT(ADDR(.orc_header) - LOAD_OFFSET) { \ 829 BOUNDED_SECTION_BY(.orc_header, _orc_header) \ 830 } \ 831 . = ALIGN(4); \ 832 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \ 833 BOUNDED_SECTION_BY(.orc_unwind_ip, _orc_unwind_ip) \ 834 } \ 835 . = ALIGN(2); \ 836 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \ 837 BOUNDED_SECTION_BY(.orc_unwind, _orc_unwind) \ 838 } \ 839 text_size = _etext - _stext; \ 840 . = ALIGN(4); \ 841 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \ 842 orc_lookup = .; \ 843 . += (((text_size + LOOKUP_BLOCK_SIZE - 1) / \ 844 LOOKUP_BLOCK_SIZE) + 1) * 4; \ 845 orc_lookup_end = .; \ 846 } 847 #else 848 #define ORC_UNWIND_TABLE 849 #endif 850 851 /* Built-in firmware blobs */ 852 #ifdef CONFIG_FW_LOADER 853 #define FW_LOADER_BUILT_IN_DATA \ 854 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) { \ 855 BOUNDED_SECTION_PRE_LABEL(.builtin_fw, _builtin_fw, __start, __end) \ 856 } 857 #else 858 #define FW_LOADER_BUILT_IN_DATA 859 #endif 860 861 #ifdef CONFIG_PM_TRACE 862 #define TRACEDATA \ 863 . = ALIGN(4); \ 864 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 865 BOUNDED_SECTION_POST_LABEL(.tracedata, __tracedata, _start, _end) \ 866 } 867 #else 868 #define TRACEDATA 869 #endif 870 871 #ifdef CONFIG_PRINTK_INDEX 872 #define PRINTK_INDEX \ 873 .printk_index : AT(ADDR(.printk_index) - LOAD_OFFSET) { \ 874 BOUNDED_SECTION_BY(.printk_index, _printk_index) \ 875 } 876 #else 877 #define PRINTK_INDEX 878 #endif 879 880 /* 881 * Discard .note.GNU-stack, which is emitted as PROGBITS by the compiler. 882 * Otherwise, the type of .notes section would become PROGBITS instead of NOTES. 883 * 884 * Also, discard .note.gnu.property, otherwise it forces the notes section to 885 * be 8-byte aligned which causes alignment mismatches with the kernel's custom 886 * 4-byte aligned notes. 887 */ 888 #define NOTES \ 889 /DISCARD/ : { \ 890 *(.note.GNU-stack) \ 891 *(.note.gnu.property) \ 892 } \ 893 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 894 BOUNDED_SECTION_BY(.note.*, _notes) \ 895 } NOTES_HEADERS \ 896 NOTES_HEADERS_RESTORE 897 898 #define INIT_SETUP(initsetup_align) \ 899 . = ALIGN(initsetup_align); \ 900 BOUNDED_SECTION_POST_LABEL(.init.setup, __setup, _start, _end) 901 902 #define INIT_CALLS_LEVEL(level) \ 903 __initcall##level##_start = .; \ 904 KEEP(*(.initcall##level##.init)) \ 905 KEEP(*(.initcall##level##s.init)) \ 906 907 #define INIT_CALLS \ 908 __initcall_start = .; \ 909 KEEP(*(.initcallearly.init)) \ 910 INIT_CALLS_LEVEL(0) \ 911 INIT_CALLS_LEVEL(1) \ 912 INIT_CALLS_LEVEL(2) \ 913 INIT_CALLS_LEVEL(3) \ 914 INIT_CALLS_LEVEL(4) \ 915 INIT_CALLS_LEVEL(5) \ 916 INIT_CALLS_LEVEL(rootfs) \ 917 INIT_CALLS_LEVEL(6) \ 918 INIT_CALLS_LEVEL(7) \ 919 __initcall_end = .; 920 921 #define CON_INITCALL \ 922 BOUNDED_SECTION_POST_LABEL(.con_initcall.init, __con_initcall, _start, _end) 923 924 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */ 925 #define KUNIT_TABLE() \ 926 . = ALIGN(8); \ 927 BOUNDED_SECTION_POST_LABEL(.kunit_test_suites, __kunit_suites, _start, _end) 928 929 #ifdef CONFIG_BLK_DEV_INITRD 930 #define INIT_RAM_FS \ 931 . = ALIGN(4); \ 932 __initramfs_start = .; \ 933 KEEP(*(.init.ramfs)) \ 934 . = ALIGN(8); \ 935 KEEP(*(.init.ramfs.info)) 936 #else 937 #define INIT_RAM_FS 938 #endif 939 940 /* 941 * Memory encryption operates on a page basis. Since we need to clear 942 * the memory encryption mask for this section, it needs to be aligned 943 * on a page boundary and be a page-size multiple in length. 944 * 945 * Note: We use a separate section so that only this section gets 946 * decrypted to avoid exposing more than we wish. 947 */ 948 #ifdef CONFIG_AMD_MEM_ENCRYPT 949 #define PERCPU_DECRYPTED_SECTION \ 950 . = ALIGN(PAGE_SIZE); \ 951 *(.data..percpu..decrypted) \ 952 . = ALIGN(PAGE_SIZE); 953 #else 954 #define PERCPU_DECRYPTED_SECTION 955 #endif 956 957 958 /* 959 * Default discarded sections. 960 * 961 * Some archs want to discard exit text/data at runtime rather than 962 * link time due to cross-section references such as alt instructions, 963 * bug table, eh_frame, etc. DISCARDS must be the last of output 964 * section definitions so that such archs put those in earlier section 965 * definitions. 966 */ 967 #ifdef RUNTIME_DISCARD_EXIT 968 #define EXIT_DISCARDS 969 #else 970 #define EXIT_DISCARDS \ 971 EXIT_TEXT \ 972 EXIT_DATA 973 #endif 974 975 /* 976 * Clang's -fprofile-arcs, -fsanitize=kernel-address, and 977 * -fsanitize=thread produce unwanted sections (.eh_frame 978 * and .init_array.*), but CONFIG_CONSTRUCTORS wants to 979 * keep any .init_array.* sections. 980 * https://bugs.llvm.org/show_bug.cgi?id=46478 981 */ 982 #ifdef CONFIG_UNWIND_TABLES 983 #define DISCARD_EH_FRAME 984 #else 985 #define DISCARD_EH_FRAME *(.eh_frame) 986 #endif 987 #if defined(CONFIG_GCOV_KERNEL) || defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN) 988 # ifdef CONFIG_CONSTRUCTORS 989 # define SANITIZER_DISCARDS \ 990 DISCARD_EH_FRAME 991 # else 992 # define SANITIZER_DISCARDS \ 993 *(.init_array) *(.init_array.*) \ 994 DISCARD_EH_FRAME 995 # endif 996 #else 997 # define SANITIZER_DISCARDS 998 #endif 999 1000 #define COMMON_DISCARDS \ 1001 SANITIZER_DISCARDS \ 1002 PATCHABLE_DISCARDS \ 1003 *(.discard) \ 1004 *(.discard.*) \ 1005 *(.export_symbol) \ 1006 *(.modinfo) \ 1007 /* ld.bfd warns about .gnu.version* even when not emitted */ \ 1008 *(.gnu.version*) \ 1009 1010 #define DISCARDS \ 1011 /DISCARD/ : { \ 1012 EXIT_DISCARDS \ 1013 EXIT_CALL \ 1014 COMMON_DISCARDS \ 1015 } 1016 1017 /** 1018 * PERCPU_INPUT - the percpu input sections 1019 * @cacheline: cacheline size 1020 * 1021 * The core percpu section names and core symbols which do not rely 1022 * directly upon load addresses. 1023 * 1024 * @cacheline is used to align subsections to avoid false cacheline 1025 * sharing between subsections for different purposes. 1026 */ 1027 #define PERCPU_INPUT(cacheline) \ 1028 __per_cpu_start = .; \ 1029 *(.data..percpu..first) \ 1030 . = ALIGN(PAGE_SIZE); \ 1031 *(.data..percpu..page_aligned) \ 1032 . = ALIGN(cacheline); \ 1033 *(.data..percpu..read_mostly) \ 1034 . = ALIGN(cacheline); \ 1035 *(.data..percpu) \ 1036 *(.data..percpu..shared_aligned) \ 1037 PERCPU_DECRYPTED_SECTION \ 1038 __per_cpu_end = .; 1039 1040 /** 1041 * PERCPU_VADDR - define output section for percpu area 1042 * @cacheline: cacheline size 1043 * @vaddr: explicit base address (optional) 1044 * @phdr: destination PHDR (optional) 1045 * 1046 * Macro which expands to output section for percpu area. 1047 * 1048 * @cacheline is used to align subsections to avoid false cacheline 1049 * sharing between subsections for different purposes. 1050 * 1051 * If @vaddr is not blank, it specifies explicit base address and all 1052 * percpu symbols will be offset from the given address. If blank, 1053 * @vaddr always equals @laddr + LOAD_OFFSET. 1054 * 1055 * @phdr defines the output PHDR to use if not blank. Be warned that 1056 * output PHDR is sticky. If @phdr is specified, the next output 1057 * section in the linker script will go there too. @phdr should have 1058 * a leading colon. 1059 * 1060 * Note that this macros defines __per_cpu_load as an absolute symbol. 1061 * If there is no need to put the percpu section at a predetermined 1062 * address, use PERCPU_SECTION. 1063 */ 1064 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 1065 __per_cpu_load = .; \ 1066 .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \ 1067 PERCPU_INPUT(cacheline) \ 1068 } phdr \ 1069 . = __per_cpu_load + SIZEOF(.data..percpu); 1070 1071 /** 1072 * PERCPU_SECTION - define output section for percpu area, simple version 1073 * @cacheline: cacheline size 1074 * 1075 * Align to PAGE_SIZE and outputs output section for percpu area. This 1076 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 1077 * __per_cpu_start will be identical. 1078 * 1079 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 1080 * except that __per_cpu_load is defined as a relative symbol against 1081 * .data..percpu which is required for relocatable x86_32 configuration. 1082 */ 1083 #define PERCPU_SECTION(cacheline) \ 1084 . = ALIGN(PAGE_SIZE); \ 1085 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 1086 __per_cpu_load = .; \ 1087 PERCPU_INPUT(cacheline) \ 1088 } 1089 1090 1091 /* 1092 * Definition of the high level *_SECTION macros 1093 * They will fit only a subset of the architectures 1094 */ 1095 1096 1097 /* 1098 * Writeable data. 1099 * All sections are combined in a single .data section. 1100 * The sections following CONSTRUCTORS are arranged so their 1101 * typical alignment matches. 1102 * A cacheline is typical/always less than a PAGE_SIZE so 1103 * the sections that has this restriction (or similar) 1104 * is located before the ones requiring PAGE_SIZE alignment. 1105 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 1106 * matches the requirement of PAGE_ALIGNED_DATA. 1107 * 1108 * use 0 as page_align if page_aligned data is not used */ 1109 #define RW_DATA(cacheline, pagealigned, inittask) \ 1110 . = ALIGN(PAGE_SIZE); \ 1111 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 1112 INIT_TASK_DATA(inittask) \ 1113 NOSAVE_DATA \ 1114 PAGE_ALIGNED_DATA(pagealigned) \ 1115 CACHELINE_ALIGNED_DATA(cacheline) \ 1116 READ_MOSTLY_DATA(cacheline) \ 1117 DATA_DATA \ 1118 CONSTRUCTORS \ 1119 } \ 1120 BUG_TABLE \ 1121 1122 #define INIT_TEXT_SECTION(inittext_align) \ 1123 . = ALIGN(inittext_align); \ 1124 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 1125 _sinittext = .; \ 1126 INIT_TEXT \ 1127 _einittext = .; \ 1128 } 1129 1130 #define INIT_DATA_SECTION(initsetup_align) \ 1131 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 1132 INIT_DATA \ 1133 INIT_SETUP(initsetup_align) \ 1134 INIT_CALLS \ 1135 CON_INITCALL \ 1136 INIT_RAM_FS \ 1137 } 1138 1139 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 1140 . = ALIGN(sbss_align); \ 1141 __bss_start = .; \ 1142 SBSS(sbss_align) \ 1143 BSS(bss_align) \ 1144 . = ALIGN(stop_align); \ 1145 __bss_stop = .; 1146