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 #ifdef CONFIG_HOTPLUG_CPU 142 #define CPU_KEEP(sec) *(.cpu##sec) 143 #define CPU_DISCARD(sec) 144 #else 145 #define CPU_KEEP(sec) 146 #define CPU_DISCARD(sec) *(.cpu##sec) 147 #endif 148 149 #if defined(CONFIG_MEMORY_HOTPLUG) 150 #define MEM_KEEP(sec) *(.mem##sec) 151 #define MEM_DISCARD(sec) 152 #else 153 #define MEM_KEEP(sec) 154 #define MEM_DISCARD(sec) *(.mem##sec) 155 #endif 156 157 #ifndef CONFIG_HAVE_DYNAMIC_FTRACE_NO_PATCHABLE 158 #define KEEP_PATCHABLE KEEP(*(__patchable_function_entries)) 159 #define PATCHABLE_DISCARDS 160 #else 161 #define KEEP_PATCHABLE 162 #define PATCHABLE_DISCARDS *(__patchable_function_entries) 163 #endif 164 165 #ifndef CONFIG_ARCH_SUPPORTS_CFI_CLANG 166 /* 167 * Simply points to ftrace_stub, but with the proper protocol. 168 * Defined by the linker script in linux/vmlinux.lds.h 169 */ 170 #define FTRACE_STUB_HACK ftrace_stub_graph = ftrace_stub; 171 #else 172 #define FTRACE_STUB_HACK 173 #endif 174 175 #ifdef CONFIG_FTRACE_MCOUNT_RECORD 176 /* 177 * The ftrace call sites are logged to a section whose name depends on the 178 * compiler option used. A given kernel image will only use one, AKA 179 * FTRACE_CALLSITE_SECTION. We capture all of them here to avoid header 180 * dependencies for FTRACE_CALLSITE_SECTION's definition. 181 * 182 * ftrace_ops_list_func will be defined as arch_ftrace_ops_list_func 183 * as some archs will have a different prototype for that function 184 * but ftrace_ops_list_func() will have a single prototype. 185 */ 186 #define MCOUNT_REC() . = ALIGN(8); \ 187 __start_mcount_loc = .; \ 188 KEEP(*(__mcount_loc)) \ 189 KEEP_PATCHABLE \ 190 __stop_mcount_loc = .; \ 191 FTRACE_STUB_HACK \ 192 ftrace_ops_list_func = arch_ftrace_ops_list_func; 193 #else 194 # ifdef CONFIG_FUNCTION_TRACER 195 # define MCOUNT_REC() FTRACE_STUB_HACK \ 196 ftrace_ops_list_func = arch_ftrace_ops_list_func; 197 # else 198 # define MCOUNT_REC() 199 # endif 200 #endif 201 202 #define BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_) \ 203 _BEGIN_##_label_ = .; \ 204 KEEP(*(_sec_)) \ 205 _END_##_label_ = .; 206 207 #define BOUNDED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_) \ 208 _label_##_BEGIN_ = .; \ 209 KEEP(*(_sec_)) \ 210 _label_##_END_ = .; 211 212 #define BOUNDED_SECTION_BY(_sec_, _label_) \ 213 BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, __start, __stop) 214 215 #define BOUNDED_SECTION(_sec) BOUNDED_SECTION_BY(_sec, _sec) 216 217 #define HEADERED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_, _HDR_) \ 218 _HDR_##_label_ = .; \ 219 KEEP(*(.gnu.linkonce.##_sec_)) \ 220 BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_) 221 222 #define HEADERED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_, _HDR_) \ 223 _label_##_HDR_ = .; \ 224 KEEP(*(.gnu.linkonce.##_sec_)) \ 225 BOUNDED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_) 226 227 #define HEADERED_SECTION_BY(_sec_, _label_) \ 228 HEADERED_SECTION_PRE_LABEL(_sec_, _label_, __start, __stop) 229 230 #define HEADERED_SECTION(_sec) HEADERED_SECTION_BY(_sec, _sec) 231 232 #ifdef CONFIG_TRACE_BRANCH_PROFILING 233 #define LIKELY_PROFILE() \ 234 BOUNDED_SECTION_BY(_ftrace_annotated_branch, _annotated_branch_profile) 235 #else 236 #define LIKELY_PROFILE() 237 #endif 238 239 #ifdef CONFIG_PROFILE_ALL_BRANCHES 240 #define BRANCH_PROFILE() \ 241 BOUNDED_SECTION_BY(_ftrace_branch, _branch_profile) 242 #else 243 #define BRANCH_PROFILE() 244 #endif 245 246 #ifdef CONFIG_KPROBES 247 #define KPROBE_BLACKLIST() \ 248 . = ALIGN(8); \ 249 BOUNDED_SECTION(_kprobe_blacklist) 250 #else 251 #define KPROBE_BLACKLIST() 252 #endif 253 254 #ifdef CONFIG_FUNCTION_ERROR_INJECTION 255 #define ERROR_INJECT_WHITELIST() \ 256 STRUCT_ALIGN(); \ 257 BOUNDED_SECTION(_error_injection_whitelist) 258 #else 259 #define ERROR_INJECT_WHITELIST() 260 #endif 261 262 #ifdef CONFIG_EVENT_TRACING 263 #define FTRACE_EVENTS() \ 264 . = ALIGN(8); \ 265 BOUNDED_SECTION(_ftrace_events) \ 266 BOUNDED_SECTION_BY(_ftrace_eval_map, _ftrace_eval_maps) 267 #else 268 #define FTRACE_EVENTS() 269 #endif 270 271 #ifdef CONFIG_TRACING 272 #define TRACE_PRINTKS() BOUNDED_SECTION_BY(__trace_printk_fmt, ___trace_bprintk_fmt) 273 #define TRACEPOINT_STR() BOUNDED_SECTION_BY(__tracepoint_str, ___tracepoint_str) 274 #else 275 #define TRACE_PRINTKS() 276 #define TRACEPOINT_STR() 277 #endif 278 279 #ifdef CONFIG_FTRACE_SYSCALLS 280 #define TRACE_SYSCALLS() \ 281 . = ALIGN(8); \ 282 BOUNDED_SECTION_BY(__syscalls_metadata, _syscalls_metadata) 283 #else 284 #define TRACE_SYSCALLS() 285 #endif 286 287 #ifdef CONFIG_BPF_EVENTS 288 #define BPF_RAW_TP() STRUCT_ALIGN(); \ 289 BOUNDED_SECTION_BY(__bpf_raw_tp_map, __bpf_raw_tp) 290 #else 291 #define BPF_RAW_TP() 292 #endif 293 294 #ifdef CONFIG_SERIAL_EARLYCON 295 #define EARLYCON_TABLE() \ 296 . = ALIGN(8); \ 297 BOUNDED_SECTION_POST_LABEL(__earlycon_table, __earlycon_table, , _end) 298 #else 299 #define EARLYCON_TABLE() 300 #endif 301 302 #ifdef CONFIG_SECURITY 303 #define LSM_TABLE() \ 304 . = ALIGN(8); \ 305 BOUNDED_SECTION_PRE_LABEL(.lsm_info.init, _lsm_info, __start, __end) 306 307 #define EARLY_LSM_TABLE() \ 308 . = ALIGN(8); \ 309 BOUNDED_SECTION_PRE_LABEL(.early_lsm_info.init, _early_lsm_info, __start, __end) 310 #else 311 #define LSM_TABLE() 312 #define EARLY_LSM_TABLE() 313 #endif 314 315 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name) 316 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name) 317 #define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name) 318 #define _OF_TABLE_0(name) 319 #define _OF_TABLE_1(name) \ 320 . = ALIGN(8); \ 321 __##name##_of_table = .; \ 322 KEEP(*(__##name##_of_table)) \ 323 KEEP(*(__##name##_of_table_end)) 324 325 #define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer) 326 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip) 327 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk) 328 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem) 329 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method) 330 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method) 331 332 #ifdef CONFIG_ACPI 333 #define ACPI_PROBE_TABLE(name) \ 334 . = ALIGN(8); \ 335 BOUNDED_SECTION_POST_LABEL(__##name##_acpi_probe_table, \ 336 __##name##_acpi_probe_table,, _end) 337 #else 338 #define ACPI_PROBE_TABLE(name) 339 #endif 340 341 #ifdef CONFIG_THERMAL 342 #define THERMAL_TABLE(name) \ 343 . = ALIGN(8); \ 344 BOUNDED_SECTION_POST_LABEL(__##name##_thermal_table, \ 345 __##name##_thermal_table,, _end) 346 #else 347 #define THERMAL_TABLE(name) 348 #endif 349 350 #define KERNEL_DTB() \ 351 STRUCT_ALIGN(); \ 352 __dtb_start = .; \ 353 KEEP(*(.dtb.init.rodata)) \ 354 __dtb_end = .; 355 356 /* 357 * .data section 358 */ 359 #define DATA_DATA \ 360 *(.xiptext) \ 361 *(DATA_MAIN) \ 362 *(.data..decrypted) \ 363 *(.ref.data) \ 364 *(.data..shared_aligned) /* percpu related */ \ 365 MEM_KEEP(init.data*) \ 366 MEM_KEEP(exit.data*) \ 367 *(.data.unlikely) \ 368 __start_once = .; \ 369 *(.data.once) \ 370 __end_once = .; \ 371 STRUCT_ALIGN(); \ 372 *(__tracepoints) \ 373 /* implement dynamic printk debug */ \ 374 . = ALIGN(8); \ 375 BOUNDED_SECTION_BY(__dyndbg_classes, ___dyndbg_classes) \ 376 BOUNDED_SECTION_BY(__dyndbg, ___dyndbg) \ 377 LIKELY_PROFILE() \ 378 BRANCH_PROFILE() \ 379 TRACE_PRINTKS() \ 380 BPF_RAW_TP() \ 381 TRACEPOINT_STR() 382 383 /* 384 * Data section helpers 385 */ 386 #define NOSAVE_DATA \ 387 . = ALIGN(PAGE_SIZE); \ 388 __nosave_begin = .; \ 389 *(.data..nosave) \ 390 . = ALIGN(PAGE_SIZE); \ 391 __nosave_end = .; 392 393 #define PAGE_ALIGNED_DATA(page_align) \ 394 . = ALIGN(page_align); \ 395 *(.data..page_aligned) \ 396 . = ALIGN(page_align); 397 398 #define READ_MOSTLY_DATA(align) \ 399 . = ALIGN(align); \ 400 *(.data..read_mostly) \ 401 . = ALIGN(align); 402 403 #define CACHELINE_ALIGNED_DATA(align) \ 404 . = ALIGN(align); \ 405 *(.data..cacheline_aligned) 406 407 #define INIT_TASK_DATA(align) \ 408 . = ALIGN(align); \ 409 __start_init_task = .; \ 410 init_thread_union = .; \ 411 init_stack = .; \ 412 KEEP(*(.data..init_task)) \ 413 KEEP(*(.data..init_thread_info)) \ 414 . = __start_init_task + THREAD_SIZE; \ 415 __end_init_task = .; 416 417 #define JUMP_TABLE_DATA \ 418 . = ALIGN(8); \ 419 BOUNDED_SECTION_BY(__jump_table, ___jump_table) 420 421 #ifdef CONFIG_HAVE_STATIC_CALL_INLINE 422 #define STATIC_CALL_DATA \ 423 . = ALIGN(8); \ 424 BOUNDED_SECTION_BY(.static_call_sites, _static_call_sites) \ 425 BOUNDED_SECTION_BY(.static_call_tramp_key, _static_call_tramp_key) 426 #else 427 #define STATIC_CALL_DATA 428 #endif 429 430 /* 431 * Allow architectures to handle ro_after_init data on their 432 * own by defining an empty RO_AFTER_INIT_DATA. 433 */ 434 #ifndef RO_AFTER_INIT_DATA 435 #define RO_AFTER_INIT_DATA \ 436 . = ALIGN(8); \ 437 __start_ro_after_init = .; \ 438 *(.data..ro_after_init) \ 439 JUMP_TABLE_DATA \ 440 STATIC_CALL_DATA \ 441 __end_ro_after_init = .; 442 #endif 443 444 /* 445 * .kcfi_traps contains a list KCFI trap locations. 446 */ 447 #ifndef KCFI_TRAPS 448 #ifdef CONFIG_ARCH_USES_CFI_TRAPS 449 #define KCFI_TRAPS \ 450 __kcfi_traps : AT(ADDR(__kcfi_traps) - LOAD_OFFSET) { \ 451 BOUNDED_SECTION_BY(.kcfi_traps, ___kcfi_traps) \ 452 } 453 #else 454 #define KCFI_TRAPS 455 #endif 456 #endif 457 458 /* 459 * Read only Data 460 */ 461 #define RO_DATA(align) \ 462 . = ALIGN((align)); \ 463 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 464 __start_rodata = .; \ 465 *(.rodata) *(.rodata.*) \ 466 SCHED_DATA \ 467 RO_AFTER_INIT_DATA /* Read only after init */ \ 468 . = ALIGN(8); \ 469 BOUNDED_SECTION_BY(__tracepoints_ptrs, ___tracepoints_ptrs) \ 470 *(__tracepoints_strings)/* Tracepoints: strings */ \ 471 } \ 472 \ 473 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 474 *(.rodata1) \ 475 } \ 476 \ 477 /* PCI quirks */ \ 478 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 479 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_early, _pci_fixups_early, __start, __end) \ 480 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_header, _pci_fixups_header, __start, __end) \ 481 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_final, _pci_fixups_final, __start, __end) \ 482 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_enable, _pci_fixups_enable, __start, __end) \ 483 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_resume, _pci_fixups_resume, __start, __end) \ 484 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_suspend, _pci_fixups_suspend, __start, __end) \ 485 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_resume_early, _pci_fixups_resume_early, __start, __end) \ 486 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_suspend_late, _pci_fixups_suspend_late, __start, __end) \ 487 } \ 488 \ 489 FW_LOADER_BUILT_IN_DATA \ 490 TRACEDATA \ 491 \ 492 PRINTK_INDEX \ 493 \ 494 /* Kernel symbol table: Normal symbols */ \ 495 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 496 __start___ksymtab = .; \ 497 KEEP(*(SORT(___ksymtab+*))) \ 498 __stop___ksymtab = .; \ 499 } \ 500 \ 501 /* Kernel symbol table: GPL-only symbols */ \ 502 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 503 __start___ksymtab_gpl = .; \ 504 KEEP(*(SORT(___ksymtab_gpl+*))) \ 505 __stop___ksymtab_gpl = .; \ 506 } \ 507 \ 508 /* Kernel symbol table: Normal symbols */ \ 509 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 510 __start___kcrctab = .; \ 511 KEEP(*(SORT(___kcrctab+*))) \ 512 __stop___kcrctab = .; \ 513 } \ 514 \ 515 /* Kernel symbol table: GPL-only symbols */ \ 516 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 517 __start___kcrctab_gpl = .; \ 518 KEEP(*(SORT(___kcrctab_gpl+*))) \ 519 __stop___kcrctab_gpl = .; \ 520 } \ 521 \ 522 /* Kernel symbol table: strings */ \ 523 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 524 *(__ksymtab_strings) \ 525 } \ 526 \ 527 /* __*init sections */ \ 528 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 529 *(.ref.rodata) \ 530 MEM_KEEP(init.rodata) \ 531 MEM_KEEP(exit.rodata) \ 532 } \ 533 \ 534 /* Built-in module parameters. */ \ 535 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 536 BOUNDED_SECTION_BY(__param, ___param) \ 537 } \ 538 \ 539 /* Built-in module versions. */ \ 540 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 541 BOUNDED_SECTION_BY(__modver, ___modver) \ 542 } \ 543 \ 544 KCFI_TRAPS \ 545 \ 546 RO_EXCEPTION_TABLE \ 547 NOTES \ 548 BTF \ 549 \ 550 . = ALIGN((align)); \ 551 __end_rodata = .; 552 553 554 /* 555 * Non-instrumentable text section 556 */ 557 #define NOINSTR_TEXT \ 558 ALIGN_FUNCTION(); \ 559 __noinstr_text_start = .; \ 560 *(.noinstr.text) \ 561 __noinstr_text_end = .; 562 563 /* 564 * .text section. Map to function alignment to avoid address changes 565 * during second ld run in second ld pass when generating System.map 566 * 567 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead 568 * code elimination is enabled, so these sections should be converted 569 * to use ".." first. 570 */ 571 #define TEXT_TEXT \ 572 ALIGN_FUNCTION(); \ 573 *(.text.hot .text.hot.*) \ 574 *(TEXT_MAIN .text.fixup) \ 575 *(.text.unlikely .text.unlikely.*) \ 576 *(.text.unknown .text.unknown.*) \ 577 NOINSTR_TEXT \ 578 *(.text..refcount) \ 579 *(.ref.text) \ 580 *(.text.asan.* .text.tsan.*) \ 581 MEM_KEEP(init.text*) \ 582 MEM_KEEP(exit.text*) \ 583 584 585 /* sched.text is aling to function alignment to secure we have same 586 * address even at second ld pass when generating System.map */ 587 #define SCHED_TEXT \ 588 ALIGN_FUNCTION(); \ 589 __sched_text_start = .; \ 590 *(.sched.text) \ 591 __sched_text_end = .; 592 593 /* spinlock.text is aling to function alignment to secure we have same 594 * address even at second ld pass when generating System.map */ 595 #define LOCK_TEXT \ 596 ALIGN_FUNCTION(); \ 597 __lock_text_start = .; \ 598 *(.spinlock.text) \ 599 __lock_text_end = .; 600 601 #define CPUIDLE_TEXT \ 602 ALIGN_FUNCTION(); \ 603 __cpuidle_text_start = .; \ 604 *(.cpuidle.text) \ 605 __cpuidle_text_end = .; 606 607 #define KPROBES_TEXT \ 608 ALIGN_FUNCTION(); \ 609 __kprobes_text_start = .; \ 610 *(.kprobes.text) \ 611 __kprobes_text_end = .; 612 613 #define ENTRY_TEXT \ 614 ALIGN_FUNCTION(); \ 615 __entry_text_start = .; \ 616 *(.entry.text) \ 617 __entry_text_end = .; 618 619 #define IRQENTRY_TEXT \ 620 ALIGN_FUNCTION(); \ 621 __irqentry_text_start = .; \ 622 *(.irqentry.text) \ 623 __irqentry_text_end = .; 624 625 #define SOFTIRQENTRY_TEXT \ 626 ALIGN_FUNCTION(); \ 627 __softirqentry_text_start = .; \ 628 *(.softirqentry.text) \ 629 __softirqentry_text_end = .; 630 631 #define STATIC_CALL_TEXT \ 632 ALIGN_FUNCTION(); \ 633 __static_call_text_start = .; \ 634 *(.static_call.text) \ 635 __static_call_text_end = .; 636 637 /* Section used for early init (in .S files) */ 638 #define HEAD_TEXT KEEP(*(.head.text)) 639 640 #define HEAD_TEXT_SECTION \ 641 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 642 HEAD_TEXT \ 643 } 644 645 /* 646 * Exception table 647 */ 648 #define EXCEPTION_TABLE(align) \ 649 . = ALIGN(align); \ 650 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 651 BOUNDED_SECTION_BY(__ex_table, ___ex_table) \ 652 } 653 654 /* 655 * .BTF 656 */ 657 #ifdef CONFIG_DEBUG_INFO_BTF 658 #define BTF \ 659 .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \ 660 BOUNDED_SECTION_BY(.BTF, _BTF) \ 661 } \ 662 . = ALIGN(4); \ 663 .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) { \ 664 *(.BTF_ids) \ 665 } 666 #else 667 #define BTF 668 #endif 669 670 /* 671 * Init task 672 */ 673 #define INIT_TASK_DATA_SECTION(align) \ 674 . = ALIGN(align); \ 675 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 676 INIT_TASK_DATA(align) \ 677 } 678 679 #ifdef CONFIG_CONSTRUCTORS 680 #define KERNEL_CTORS() . = ALIGN(8); \ 681 __ctors_start = .; \ 682 KEEP(*(SORT(.ctors.*))) \ 683 KEEP(*(.ctors)) \ 684 KEEP(*(SORT(.init_array.*))) \ 685 KEEP(*(.init_array)) \ 686 __ctors_end = .; 687 #else 688 #define KERNEL_CTORS() 689 #endif 690 691 /* init and exit section handling */ 692 #define INIT_DATA \ 693 KEEP(*(SORT(___kentry+*))) \ 694 *(.init.data init.data.*) \ 695 MEM_DISCARD(init.data*) \ 696 KERNEL_CTORS() \ 697 MCOUNT_REC() \ 698 *(.init.rodata .init.rodata.*) \ 699 FTRACE_EVENTS() \ 700 TRACE_SYSCALLS() \ 701 KPROBE_BLACKLIST() \ 702 ERROR_INJECT_WHITELIST() \ 703 MEM_DISCARD(init.rodata) \ 704 CLK_OF_TABLES() \ 705 RESERVEDMEM_OF_TABLES() \ 706 TIMER_OF_TABLES() \ 707 CPU_METHOD_OF_TABLES() \ 708 CPUIDLE_METHOD_OF_TABLES() \ 709 KERNEL_DTB() \ 710 IRQCHIP_OF_MATCH_TABLE() \ 711 ACPI_PROBE_TABLE(irqchip) \ 712 ACPI_PROBE_TABLE(timer) \ 713 THERMAL_TABLE(governor) \ 714 EARLYCON_TABLE() \ 715 LSM_TABLE() \ 716 EARLY_LSM_TABLE() \ 717 KUNIT_TABLE() 718 719 #define INIT_TEXT \ 720 *(.init.text .init.text.*) \ 721 *(.text.startup) \ 722 MEM_DISCARD(init.text*) 723 724 #define EXIT_DATA \ 725 *(.exit.data .exit.data.*) \ 726 *(.fini_array .fini_array.*) \ 727 *(.dtors .dtors.*) \ 728 MEM_DISCARD(exit.data*) \ 729 MEM_DISCARD(exit.rodata*) 730 731 #define EXIT_TEXT \ 732 *(.exit.text) \ 733 *(.text.exit) \ 734 MEM_DISCARD(exit.text) 735 736 #define EXIT_CALL \ 737 *(.exitcall.exit) 738 739 /* 740 * bss (Block Started by Symbol) - uninitialized data 741 * zeroed during startup 742 */ 743 #define SBSS(sbss_align) \ 744 . = ALIGN(sbss_align); \ 745 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 746 *(.dynsbss) \ 747 *(SBSS_MAIN) \ 748 *(.scommon) \ 749 } 750 751 /* 752 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 753 * sections to the front of bss. 754 */ 755 #ifndef BSS_FIRST_SECTIONS 756 #define BSS_FIRST_SECTIONS 757 #endif 758 759 #define BSS(bss_align) \ 760 . = ALIGN(bss_align); \ 761 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 762 BSS_FIRST_SECTIONS \ 763 . = ALIGN(PAGE_SIZE); \ 764 *(.bss..page_aligned) \ 765 . = ALIGN(PAGE_SIZE); \ 766 *(.dynbss) \ 767 *(BSS_MAIN) \ 768 *(COMMON) \ 769 } 770 771 /* 772 * DWARF debug sections. 773 * Symbols in the DWARF debugging sections are relative to 774 * the beginning of the section so we begin them at 0. 775 */ 776 #define DWARF_DEBUG \ 777 /* DWARF 1 */ \ 778 .debug 0 : { *(.debug) } \ 779 .line 0 : { *(.line) } \ 780 /* GNU DWARF 1 extensions */ \ 781 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 782 .debug_sfnames 0 : { *(.debug_sfnames) } \ 783 /* DWARF 1.1 and DWARF 2 */ \ 784 .debug_aranges 0 : { *(.debug_aranges) } \ 785 .debug_pubnames 0 : { *(.debug_pubnames) } \ 786 /* DWARF 2 */ \ 787 .debug_info 0 : { *(.debug_info \ 788 .gnu.linkonce.wi.*) } \ 789 .debug_abbrev 0 : { *(.debug_abbrev) } \ 790 .debug_line 0 : { *(.debug_line) } \ 791 .debug_frame 0 : { *(.debug_frame) } \ 792 .debug_str 0 : { *(.debug_str) } \ 793 .debug_loc 0 : { *(.debug_loc) } \ 794 .debug_macinfo 0 : { *(.debug_macinfo) } \ 795 .debug_pubtypes 0 : { *(.debug_pubtypes) } \ 796 /* DWARF 3 */ \ 797 .debug_ranges 0 : { *(.debug_ranges) } \ 798 /* SGI/MIPS DWARF 2 extensions */ \ 799 .debug_weaknames 0 : { *(.debug_weaknames) } \ 800 .debug_funcnames 0 : { *(.debug_funcnames) } \ 801 .debug_typenames 0 : { *(.debug_typenames) } \ 802 .debug_varnames 0 : { *(.debug_varnames) } \ 803 /* GNU DWARF 2 extensions */ \ 804 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \ 805 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \ 806 /* DWARF 4 */ \ 807 .debug_types 0 : { *(.debug_types) } \ 808 /* DWARF 5 */ \ 809 .debug_addr 0 : { *(.debug_addr) } \ 810 .debug_line_str 0 : { *(.debug_line_str) } \ 811 .debug_loclists 0 : { *(.debug_loclists) } \ 812 .debug_macro 0 : { *(.debug_macro) } \ 813 .debug_names 0 : { *(.debug_names) } \ 814 .debug_rnglists 0 : { *(.debug_rnglists) } \ 815 .debug_str_offsets 0 : { *(.debug_str_offsets) } 816 817 /* Stabs debugging sections. */ 818 #define STABS_DEBUG \ 819 .stab 0 : { *(.stab) } \ 820 .stabstr 0 : { *(.stabstr) } \ 821 .stab.excl 0 : { *(.stab.excl) } \ 822 .stab.exclstr 0 : { *(.stab.exclstr) } \ 823 .stab.index 0 : { *(.stab.index) } \ 824 .stab.indexstr 0 : { *(.stab.indexstr) } 825 826 /* Required sections not related to debugging. */ 827 #define ELF_DETAILS \ 828 .comment 0 : { *(.comment) } \ 829 .symtab 0 : { *(.symtab) } \ 830 .strtab 0 : { *(.strtab) } \ 831 .shstrtab 0 : { *(.shstrtab) } 832 833 #ifdef CONFIG_GENERIC_BUG 834 #define BUG_TABLE \ 835 . = ALIGN(8); \ 836 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 837 BOUNDED_SECTION_BY(__bug_table, ___bug_table) \ 838 } 839 #else 840 #define BUG_TABLE 841 #endif 842 843 #ifdef CONFIG_UNWINDER_ORC 844 #define ORC_UNWIND_TABLE \ 845 . = ALIGN(4); \ 846 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \ 847 BOUNDED_SECTION_BY(.orc_unwind_ip, _orc_unwind_ip) \ 848 } \ 849 . = ALIGN(2); \ 850 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \ 851 BOUNDED_SECTION_BY(.orc_unwind, _orc_unwind) \ 852 } \ 853 text_size = _etext - _stext; \ 854 . = ALIGN(4); \ 855 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \ 856 orc_lookup = .; \ 857 . += (((text_size + LOOKUP_BLOCK_SIZE - 1) / \ 858 LOOKUP_BLOCK_SIZE) + 1) * 4; \ 859 orc_lookup_end = .; \ 860 } 861 #else 862 #define ORC_UNWIND_TABLE 863 #endif 864 865 /* Built-in firmware blobs */ 866 #ifdef CONFIG_FW_LOADER 867 #define FW_LOADER_BUILT_IN_DATA \ 868 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) { \ 869 BOUNDED_SECTION_PRE_LABEL(.builtin_fw, _builtin_fw, __start, __end) \ 870 } 871 #else 872 #define FW_LOADER_BUILT_IN_DATA 873 #endif 874 875 #ifdef CONFIG_PM_TRACE 876 #define TRACEDATA \ 877 . = ALIGN(4); \ 878 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 879 BOUNDED_SECTION_POST_LABEL(.tracedata, __tracedata, _start, _end) \ 880 } 881 #else 882 #define TRACEDATA 883 #endif 884 885 #ifdef CONFIG_PRINTK_INDEX 886 #define PRINTK_INDEX \ 887 .printk_index : AT(ADDR(.printk_index) - LOAD_OFFSET) { \ 888 BOUNDED_SECTION_BY(.printk_index, _printk_index) \ 889 } 890 #else 891 #define PRINTK_INDEX 892 #endif 893 894 /* 895 * Discard .note.GNU-stack, which is emitted as PROGBITS by the compiler. 896 * Otherwise, the type of .notes section would become PROGBITS instead of NOTES. 897 */ 898 #define NOTES \ 899 /DISCARD/ : { *(.note.GNU-stack) } \ 900 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 901 BOUNDED_SECTION_BY(.note.*, _notes) \ 902 } NOTES_HEADERS \ 903 NOTES_HEADERS_RESTORE 904 905 #define INIT_SETUP(initsetup_align) \ 906 . = ALIGN(initsetup_align); \ 907 BOUNDED_SECTION_POST_LABEL(.init.setup, __setup, _start, _end) 908 909 #define INIT_CALLS_LEVEL(level) \ 910 __initcall##level##_start = .; \ 911 KEEP(*(.initcall##level##.init)) \ 912 KEEP(*(.initcall##level##s.init)) \ 913 914 #define INIT_CALLS \ 915 __initcall_start = .; \ 916 KEEP(*(.initcallearly.init)) \ 917 INIT_CALLS_LEVEL(0) \ 918 INIT_CALLS_LEVEL(1) \ 919 INIT_CALLS_LEVEL(2) \ 920 INIT_CALLS_LEVEL(3) \ 921 INIT_CALLS_LEVEL(4) \ 922 INIT_CALLS_LEVEL(5) \ 923 INIT_CALLS_LEVEL(rootfs) \ 924 INIT_CALLS_LEVEL(6) \ 925 INIT_CALLS_LEVEL(7) \ 926 __initcall_end = .; 927 928 #define CON_INITCALL \ 929 BOUNDED_SECTION_POST_LABEL(.con_initcall.init, __con_initcall, _start, _end) 930 931 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */ 932 #define KUNIT_TABLE() \ 933 . = ALIGN(8); \ 934 BOUNDED_SECTION_POST_LABEL(.kunit_test_suites, __kunit_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 *(.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