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 MEM_KEEP(exit.data*) \ 360 *(.data.unlikely) \ 361 __start_once = .; \ 362 *(.data.once) \ 363 __end_once = .; \ 364 STRUCT_ALIGN(); \ 365 *(__tracepoints) \ 366 /* implement dynamic printk debug */ \ 367 . = ALIGN(8); \ 368 BOUNDED_SECTION_BY(__dyndbg_classes, ___dyndbg_classes) \ 369 BOUNDED_SECTION_BY(__dyndbg, ___dyndbg) \ 370 LIKELY_PROFILE() \ 371 BRANCH_PROFILE() \ 372 TRACE_PRINTKS() \ 373 BPF_RAW_TP() \ 374 TRACEPOINT_STR() 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 MEM_KEEP(exit.rodata) \ 525 } \ 526 \ 527 /* Built-in module parameters. */ \ 528 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 529 BOUNDED_SECTION_BY(__param, ___param) \ 530 } \ 531 \ 532 /* Built-in module versions. */ \ 533 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 534 BOUNDED_SECTION_BY(__modver, ___modver) \ 535 } \ 536 \ 537 KCFI_TRAPS \ 538 \ 539 RO_EXCEPTION_TABLE \ 540 NOTES \ 541 BTF \ 542 \ 543 . = ALIGN((align)); \ 544 __end_rodata = .; 545 546 547 /* 548 * Non-instrumentable text section 549 */ 550 #define NOINSTR_TEXT \ 551 ALIGN_FUNCTION(); \ 552 __noinstr_text_start = .; \ 553 *(.noinstr.text) \ 554 __cpuidle_text_start = .; \ 555 *(.cpuidle.text) \ 556 __cpuidle_text_end = .; \ 557 __noinstr_text_end = .; 558 559 /* 560 * .text section. Map to function alignment to avoid address changes 561 * during second ld run in second ld pass when generating System.map 562 * 563 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead 564 * code elimination is enabled, so these sections should be converted 565 * to use ".." first. 566 */ 567 #define TEXT_TEXT \ 568 ALIGN_FUNCTION(); \ 569 *(.text.hot .text.hot.*) \ 570 *(TEXT_MAIN .text.fixup) \ 571 *(.text.unlikely .text.unlikely.*) \ 572 *(.text.unknown .text.unknown.*) \ 573 NOINSTR_TEXT \ 574 *(.ref.text) \ 575 *(.text.asan.* .text.tsan.*) \ 576 MEM_KEEP(init.text*) \ 577 MEM_KEEP(exit.text*) \ 578 579 580 /* sched.text is aling to function alignment to secure we have same 581 * address even at second ld pass when generating System.map */ 582 #define SCHED_TEXT \ 583 ALIGN_FUNCTION(); \ 584 __sched_text_start = .; \ 585 *(.sched.text) \ 586 __sched_text_end = .; 587 588 /* spinlock.text is aling to function alignment to secure we have same 589 * address even at second ld pass when generating System.map */ 590 #define LOCK_TEXT \ 591 ALIGN_FUNCTION(); \ 592 __lock_text_start = .; \ 593 *(.spinlock.text) \ 594 __lock_text_end = .; 595 596 #define KPROBES_TEXT \ 597 ALIGN_FUNCTION(); \ 598 __kprobes_text_start = .; \ 599 *(.kprobes.text) \ 600 __kprobes_text_end = .; 601 602 #define ENTRY_TEXT \ 603 ALIGN_FUNCTION(); \ 604 __entry_text_start = .; \ 605 *(.entry.text) \ 606 __entry_text_end = .; 607 608 #define IRQENTRY_TEXT \ 609 ALIGN_FUNCTION(); \ 610 __irqentry_text_start = .; \ 611 *(.irqentry.text) \ 612 __irqentry_text_end = .; 613 614 #define SOFTIRQENTRY_TEXT \ 615 ALIGN_FUNCTION(); \ 616 __softirqentry_text_start = .; \ 617 *(.softirqentry.text) \ 618 __softirqentry_text_end = .; 619 620 #define STATIC_CALL_TEXT \ 621 ALIGN_FUNCTION(); \ 622 __static_call_text_start = .; \ 623 *(.static_call.text) \ 624 __static_call_text_end = .; 625 626 /* Section used for early init (in .S files) */ 627 #define HEAD_TEXT KEEP(*(.head.text)) 628 629 #define HEAD_TEXT_SECTION \ 630 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 631 HEAD_TEXT \ 632 } 633 634 /* 635 * Exception table 636 */ 637 #define EXCEPTION_TABLE(align) \ 638 . = ALIGN(align); \ 639 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 640 BOUNDED_SECTION_BY(__ex_table, ___ex_table) \ 641 } 642 643 /* 644 * .BTF 645 */ 646 #ifdef CONFIG_DEBUG_INFO_BTF 647 #define BTF \ 648 .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \ 649 BOUNDED_SECTION_BY(.BTF, _BTF) \ 650 } \ 651 . = ALIGN(4); \ 652 .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) { \ 653 *(.BTF_ids) \ 654 } 655 #else 656 #define BTF 657 #endif 658 659 /* 660 * Init task 661 */ 662 #define INIT_TASK_DATA_SECTION(align) \ 663 . = ALIGN(align); \ 664 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 665 INIT_TASK_DATA(align) \ 666 } 667 668 #ifdef CONFIG_CONSTRUCTORS 669 #define KERNEL_CTORS() . = ALIGN(8); \ 670 __ctors_start = .; \ 671 KEEP(*(SORT(.ctors.*))) \ 672 KEEP(*(.ctors)) \ 673 KEEP(*(SORT(.init_array.*))) \ 674 KEEP(*(.init_array)) \ 675 __ctors_end = .; 676 #else 677 #define KERNEL_CTORS() 678 #endif 679 680 /* init and exit section handling */ 681 #define INIT_DATA \ 682 KEEP(*(SORT(___kentry+*))) \ 683 *(.init.data .init.data.*) \ 684 MEM_DISCARD(init.data*) \ 685 KERNEL_CTORS() \ 686 MCOUNT_REC() \ 687 *(.init.rodata .init.rodata.*) \ 688 FTRACE_EVENTS() \ 689 TRACE_SYSCALLS() \ 690 KPROBE_BLACKLIST() \ 691 ERROR_INJECT_WHITELIST() \ 692 MEM_DISCARD(init.rodata) \ 693 CLK_OF_TABLES() \ 694 RESERVEDMEM_OF_TABLES() \ 695 TIMER_OF_TABLES() \ 696 CPU_METHOD_OF_TABLES() \ 697 CPUIDLE_METHOD_OF_TABLES() \ 698 KERNEL_DTB() \ 699 IRQCHIP_OF_MATCH_TABLE() \ 700 ACPI_PROBE_TABLE(irqchip) \ 701 ACPI_PROBE_TABLE(timer) \ 702 THERMAL_TABLE(governor) \ 703 EARLYCON_TABLE() \ 704 LSM_TABLE() \ 705 EARLY_LSM_TABLE() \ 706 KUNIT_TABLE() 707 708 #define INIT_TEXT \ 709 *(.init.text .init.text.*) \ 710 *(.text.startup) \ 711 MEM_DISCARD(init.text*) 712 713 #define EXIT_DATA \ 714 *(.exit.data .exit.data.*) \ 715 *(.fini_array .fini_array.*) \ 716 *(.dtors .dtors.*) \ 717 MEM_DISCARD(exit.data*) \ 718 MEM_DISCARD(exit.rodata*) 719 720 #define EXIT_TEXT \ 721 *(.exit.text) \ 722 *(.text.exit) \ 723 MEM_DISCARD(exit.text) 724 725 #define EXIT_CALL \ 726 *(.exitcall.exit) 727 728 /* 729 * bss (Block Started by Symbol) - uninitialized data 730 * zeroed during startup 731 */ 732 #define SBSS(sbss_align) \ 733 . = ALIGN(sbss_align); \ 734 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 735 *(.dynsbss) \ 736 *(SBSS_MAIN) \ 737 *(.scommon) \ 738 } 739 740 /* 741 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 742 * sections to the front of bss. 743 */ 744 #ifndef BSS_FIRST_SECTIONS 745 #define BSS_FIRST_SECTIONS 746 #endif 747 748 #define BSS(bss_align) \ 749 . = ALIGN(bss_align); \ 750 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 751 BSS_FIRST_SECTIONS \ 752 . = ALIGN(PAGE_SIZE); \ 753 *(.bss..page_aligned) \ 754 . = ALIGN(PAGE_SIZE); \ 755 *(.dynbss) \ 756 *(BSS_MAIN) \ 757 *(COMMON) \ 758 } 759 760 /* 761 * DWARF debug sections. 762 * Symbols in the DWARF debugging sections are relative to 763 * the beginning of the section so we begin them at 0. 764 */ 765 #define DWARF_DEBUG \ 766 /* DWARF 1 */ \ 767 .debug 0 : { *(.debug) } \ 768 .line 0 : { *(.line) } \ 769 /* GNU DWARF 1 extensions */ \ 770 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 771 .debug_sfnames 0 : { *(.debug_sfnames) } \ 772 /* DWARF 1.1 and DWARF 2 */ \ 773 .debug_aranges 0 : { *(.debug_aranges) } \ 774 .debug_pubnames 0 : { *(.debug_pubnames) } \ 775 /* DWARF 2 */ \ 776 .debug_info 0 : { *(.debug_info \ 777 .gnu.linkonce.wi.*) } \ 778 .debug_abbrev 0 : { *(.debug_abbrev) } \ 779 .debug_line 0 : { *(.debug_line) } \ 780 .debug_frame 0 : { *(.debug_frame) } \ 781 .debug_str 0 : { *(.debug_str) } \ 782 .debug_loc 0 : { *(.debug_loc) } \ 783 .debug_macinfo 0 : { *(.debug_macinfo) } \ 784 .debug_pubtypes 0 : { *(.debug_pubtypes) } \ 785 /* DWARF 3 */ \ 786 .debug_ranges 0 : { *(.debug_ranges) } \ 787 /* SGI/MIPS DWARF 2 extensions */ \ 788 .debug_weaknames 0 : { *(.debug_weaknames) } \ 789 .debug_funcnames 0 : { *(.debug_funcnames) } \ 790 .debug_typenames 0 : { *(.debug_typenames) } \ 791 .debug_varnames 0 : { *(.debug_varnames) } \ 792 /* GNU DWARF 2 extensions */ \ 793 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \ 794 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \ 795 /* DWARF 4 */ \ 796 .debug_types 0 : { *(.debug_types) } \ 797 /* DWARF 5 */ \ 798 .debug_addr 0 : { *(.debug_addr) } \ 799 .debug_line_str 0 : { *(.debug_line_str) } \ 800 .debug_loclists 0 : { *(.debug_loclists) } \ 801 .debug_macro 0 : { *(.debug_macro) } \ 802 .debug_names 0 : { *(.debug_names) } \ 803 .debug_rnglists 0 : { *(.debug_rnglists) } \ 804 .debug_str_offsets 0 : { *(.debug_str_offsets) } 805 806 /* Stabs debugging sections. */ 807 #define STABS_DEBUG \ 808 .stab 0 : { *(.stab) } \ 809 .stabstr 0 : { *(.stabstr) } \ 810 .stab.excl 0 : { *(.stab.excl) } \ 811 .stab.exclstr 0 : { *(.stab.exclstr) } \ 812 .stab.index 0 : { *(.stab.index) } \ 813 .stab.indexstr 0 : { *(.stab.indexstr) } 814 815 /* Required sections not related to debugging. */ 816 #define ELF_DETAILS \ 817 .comment 0 : { *(.comment) } \ 818 .symtab 0 : { *(.symtab) } \ 819 .strtab 0 : { *(.strtab) } \ 820 .shstrtab 0 : { *(.shstrtab) } 821 822 #ifdef CONFIG_GENERIC_BUG 823 #define BUG_TABLE \ 824 . = ALIGN(8); \ 825 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 826 BOUNDED_SECTION_BY(__bug_table, ___bug_table) \ 827 } 828 #else 829 #define BUG_TABLE 830 #endif 831 832 #ifdef CONFIG_UNWINDER_ORC 833 #define ORC_UNWIND_TABLE \ 834 .orc_header : AT(ADDR(.orc_header) - LOAD_OFFSET) { \ 835 BOUNDED_SECTION_BY(.orc_header, _orc_header) \ 836 } \ 837 . = ALIGN(4); \ 838 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \ 839 BOUNDED_SECTION_BY(.orc_unwind_ip, _orc_unwind_ip) \ 840 } \ 841 . = ALIGN(2); \ 842 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \ 843 BOUNDED_SECTION_BY(.orc_unwind, _orc_unwind) \ 844 } \ 845 text_size = _etext - _stext; \ 846 . = ALIGN(4); \ 847 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \ 848 orc_lookup = .; \ 849 . += (((text_size + LOOKUP_BLOCK_SIZE - 1) / \ 850 LOOKUP_BLOCK_SIZE) + 1) * 4; \ 851 orc_lookup_end = .; \ 852 } 853 #else 854 #define ORC_UNWIND_TABLE 855 #endif 856 857 /* Built-in firmware blobs */ 858 #ifdef CONFIG_FW_LOADER 859 #define FW_LOADER_BUILT_IN_DATA \ 860 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) { \ 861 BOUNDED_SECTION_PRE_LABEL(.builtin_fw, _builtin_fw, __start, __end) \ 862 } 863 #else 864 #define FW_LOADER_BUILT_IN_DATA 865 #endif 866 867 #ifdef CONFIG_PM_TRACE 868 #define TRACEDATA \ 869 . = ALIGN(4); \ 870 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 871 BOUNDED_SECTION_POST_LABEL(.tracedata, __tracedata, _start, _end) \ 872 } 873 #else 874 #define TRACEDATA 875 #endif 876 877 #ifdef CONFIG_PRINTK_INDEX 878 #define PRINTK_INDEX \ 879 .printk_index : AT(ADDR(.printk_index) - LOAD_OFFSET) { \ 880 BOUNDED_SECTION_BY(.printk_index, _printk_index) \ 881 } 882 #else 883 #define PRINTK_INDEX 884 #endif 885 886 /* 887 * Discard .note.GNU-stack, which is emitted as PROGBITS by the compiler. 888 * Otherwise, the type of .notes section would become PROGBITS instead of NOTES. 889 * 890 * Also, discard .note.gnu.property, otherwise it forces the notes section to 891 * be 8-byte aligned which causes alignment mismatches with the kernel's custom 892 * 4-byte aligned notes. 893 */ 894 #define NOTES \ 895 /DISCARD/ : { \ 896 *(.note.GNU-stack) \ 897 *(.note.gnu.property) \ 898 } \ 899 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 900 BOUNDED_SECTION_BY(.note.*, _notes) \ 901 } NOTES_HEADERS \ 902 NOTES_HEADERS_RESTORE 903 904 #define INIT_SETUP(initsetup_align) \ 905 . = ALIGN(initsetup_align); \ 906 BOUNDED_SECTION_POST_LABEL(.init.setup, __setup, _start, _end) 907 908 #define INIT_CALLS_LEVEL(level) \ 909 __initcall##level##_start = .; \ 910 KEEP(*(.initcall##level##.init)) \ 911 KEEP(*(.initcall##level##s.init)) \ 912 913 #define INIT_CALLS \ 914 __initcall_start = .; \ 915 KEEP(*(.initcallearly.init)) \ 916 INIT_CALLS_LEVEL(0) \ 917 INIT_CALLS_LEVEL(1) \ 918 INIT_CALLS_LEVEL(2) \ 919 INIT_CALLS_LEVEL(3) \ 920 INIT_CALLS_LEVEL(4) \ 921 INIT_CALLS_LEVEL(5) \ 922 INIT_CALLS_LEVEL(rootfs) \ 923 INIT_CALLS_LEVEL(6) \ 924 INIT_CALLS_LEVEL(7) \ 925 __initcall_end = .; 926 927 #define CON_INITCALL \ 928 BOUNDED_SECTION_POST_LABEL(.con_initcall.init, __con_initcall, _start, _end) 929 930 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */ 931 #define KUNIT_TABLE() \ 932 . = ALIGN(8); \ 933 BOUNDED_SECTION_POST_LABEL(.kunit_test_suites, __kunit_suites, _start, _end) 934 935 #ifdef CONFIG_BLK_DEV_INITRD 936 #define INIT_RAM_FS \ 937 . = ALIGN(4); \ 938 __initramfs_start = .; \ 939 KEEP(*(.init.ramfs)) \ 940 . = ALIGN(8); \ 941 KEEP(*(.init.ramfs.info)) 942 #else 943 #define INIT_RAM_FS 944 #endif 945 946 /* 947 * Memory encryption operates on a page basis. Since we need to clear 948 * the memory encryption mask for this section, it needs to be aligned 949 * on a page boundary and be a page-size multiple in length. 950 * 951 * Note: We use a separate section so that only this section gets 952 * decrypted to avoid exposing more than we wish. 953 */ 954 #ifdef CONFIG_AMD_MEM_ENCRYPT 955 #define PERCPU_DECRYPTED_SECTION \ 956 . = ALIGN(PAGE_SIZE); \ 957 *(.data..percpu..decrypted) \ 958 . = ALIGN(PAGE_SIZE); 959 #else 960 #define PERCPU_DECRYPTED_SECTION 961 #endif 962 963 964 /* 965 * Default discarded sections. 966 * 967 * Some archs want to discard exit text/data at runtime rather than 968 * link time due to cross-section references such as alt instructions, 969 * bug table, eh_frame, etc. DISCARDS must be the last of output 970 * section definitions so that such archs put those in earlier section 971 * definitions. 972 */ 973 #ifdef RUNTIME_DISCARD_EXIT 974 #define EXIT_DISCARDS 975 #else 976 #define EXIT_DISCARDS \ 977 EXIT_TEXT \ 978 EXIT_DATA 979 #endif 980 981 /* 982 * Clang's -fprofile-arcs, -fsanitize=kernel-address, and 983 * -fsanitize=thread produce unwanted sections (.eh_frame 984 * and .init_array.*), but CONFIG_CONSTRUCTORS wants to 985 * keep any .init_array.* sections. 986 * https://bugs.llvm.org/show_bug.cgi?id=46478 987 */ 988 #ifdef CONFIG_UNWIND_TABLES 989 #define DISCARD_EH_FRAME 990 #else 991 #define DISCARD_EH_FRAME *(.eh_frame) 992 #endif 993 #if defined(CONFIG_GCOV_KERNEL) || defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN) 994 # ifdef CONFIG_CONSTRUCTORS 995 # define SANITIZER_DISCARDS \ 996 DISCARD_EH_FRAME 997 # else 998 # define SANITIZER_DISCARDS \ 999 *(.init_array) *(.init_array.*) \ 1000 DISCARD_EH_FRAME 1001 # endif 1002 #else 1003 # define SANITIZER_DISCARDS 1004 #endif 1005 1006 #define COMMON_DISCARDS \ 1007 SANITIZER_DISCARDS \ 1008 PATCHABLE_DISCARDS \ 1009 *(.discard) \ 1010 *(.discard.*) \ 1011 *(.export_symbol) \ 1012 *(.modinfo) \ 1013 /* ld.bfd warns about .gnu.version* even when not emitted */ \ 1014 *(.gnu.version*) \ 1015 1016 #define DISCARDS \ 1017 /DISCARD/ : { \ 1018 EXIT_DISCARDS \ 1019 EXIT_CALL \ 1020 COMMON_DISCARDS \ 1021 } 1022 1023 /** 1024 * PERCPU_INPUT - the percpu input sections 1025 * @cacheline: cacheline size 1026 * 1027 * The core percpu section names and core symbols which do not rely 1028 * directly upon load addresses. 1029 * 1030 * @cacheline is used to align subsections to avoid false cacheline 1031 * sharing between subsections for different purposes. 1032 */ 1033 #define PERCPU_INPUT(cacheline) \ 1034 __per_cpu_start = .; \ 1035 *(.data..percpu..first) \ 1036 . = ALIGN(PAGE_SIZE); \ 1037 *(.data..percpu..page_aligned) \ 1038 . = ALIGN(cacheline); \ 1039 *(.data..percpu..read_mostly) \ 1040 . = ALIGN(cacheline); \ 1041 *(.data..percpu) \ 1042 *(.data..percpu..shared_aligned) \ 1043 PERCPU_DECRYPTED_SECTION \ 1044 __per_cpu_end = .; 1045 1046 /** 1047 * PERCPU_VADDR - define output section for percpu area 1048 * @cacheline: cacheline size 1049 * @vaddr: explicit base address (optional) 1050 * @phdr: destination PHDR (optional) 1051 * 1052 * Macro which expands to output section for percpu area. 1053 * 1054 * @cacheline is used to align subsections to avoid false cacheline 1055 * sharing between subsections for different purposes. 1056 * 1057 * If @vaddr is not blank, it specifies explicit base address and all 1058 * percpu symbols will be offset from the given address. If blank, 1059 * @vaddr always equals @laddr + LOAD_OFFSET. 1060 * 1061 * @phdr defines the output PHDR to use if not blank. Be warned that 1062 * output PHDR is sticky. If @phdr is specified, the next output 1063 * section in the linker script will go there too. @phdr should have 1064 * a leading colon. 1065 * 1066 * Note that this macros defines __per_cpu_load as an absolute symbol. 1067 * If there is no need to put the percpu section at a predetermined 1068 * address, use PERCPU_SECTION. 1069 */ 1070 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 1071 __per_cpu_load = .; \ 1072 .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \ 1073 PERCPU_INPUT(cacheline) \ 1074 } phdr \ 1075 . = __per_cpu_load + SIZEOF(.data..percpu); 1076 1077 /** 1078 * PERCPU_SECTION - define output section for percpu area, simple version 1079 * @cacheline: cacheline size 1080 * 1081 * Align to PAGE_SIZE and outputs output section for percpu area. This 1082 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 1083 * __per_cpu_start will be identical. 1084 * 1085 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 1086 * except that __per_cpu_load is defined as a relative symbol against 1087 * .data..percpu which is required for relocatable x86_32 configuration. 1088 */ 1089 #define PERCPU_SECTION(cacheline) \ 1090 . = ALIGN(PAGE_SIZE); \ 1091 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 1092 __per_cpu_load = .; \ 1093 PERCPU_INPUT(cacheline) \ 1094 } 1095 1096 1097 /* 1098 * Definition of the high level *_SECTION macros 1099 * They will fit only a subset of the architectures 1100 */ 1101 1102 1103 /* 1104 * Writeable data. 1105 * All sections are combined in a single .data section. 1106 * The sections following CONSTRUCTORS are arranged so their 1107 * typical alignment matches. 1108 * A cacheline is typical/always less than a PAGE_SIZE so 1109 * the sections that has this restriction (or similar) 1110 * is located before the ones requiring PAGE_SIZE alignment. 1111 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 1112 * matches the requirement of PAGE_ALIGNED_DATA. 1113 * 1114 * use 0 as page_align if page_aligned data is not used */ 1115 #define RW_DATA(cacheline, pagealigned, inittask) \ 1116 . = ALIGN(PAGE_SIZE); \ 1117 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 1118 INIT_TASK_DATA(inittask) \ 1119 NOSAVE_DATA \ 1120 PAGE_ALIGNED_DATA(pagealigned) \ 1121 CACHELINE_ALIGNED_DATA(cacheline) \ 1122 READ_MOSTLY_DATA(cacheline) \ 1123 DATA_DATA \ 1124 CONSTRUCTORS \ 1125 } \ 1126 BUG_TABLE \ 1127 1128 #define INIT_TEXT_SECTION(inittext_align) \ 1129 . = ALIGN(inittext_align); \ 1130 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 1131 _sinittext = .; \ 1132 INIT_TEXT \ 1133 _einittext = .; \ 1134 } 1135 1136 #define INIT_DATA_SECTION(initsetup_align) \ 1137 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 1138 INIT_DATA \ 1139 INIT_SETUP(initsetup_align) \ 1140 INIT_CALLS \ 1141 CON_INITCALL \ 1142 INIT_RAM_FS \ 1143 } 1144 1145 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 1146 . = ALIGN(sbss_align); \ 1147 __bss_start = .; \ 1148 SBSS(sbss_align) \ 1149 BSS(bss_align) \ 1150 . = ALIGN(stop_align); \ 1151 __bss_stop = .; 1152