1 /* 2 * Helper macros to support writing architecture specific 3 * linker scripts. 4 * 5 * A minimal linker scripts has following content: 6 * [This is a sample, architectures may have special requirements] 7 * 8 * OUTPUT_FORMAT(...) 9 * OUTPUT_ARCH(...) 10 * ENTRY(...) 11 * SECTIONS 12 * { 13 * . = START; 14 * __init_begin = .; 15 * HEAD_TEXT_SECTION 16 * INIT_TEXT_SECTION(PAGE_SIZE) 17 * INIT_DATA_SECTION(...) 18 * PERCPU_SECTION(CACHELINE_SIZE) 19 * __init_end = .; 20 * 21 * _stext = .; 22 * TEXT_SECTION = 0 23 * _etext = .; 24 * 25 * _sdata = .; 26 * RO_DATA(PAGE_SIZE) 27 * RW_DATA(...) 28 * _edata = .; 29 * 30 * EXCEPTION_TABLE(...) 31 * 32 * BSS_SECTION(0, 0, 0) 33 * _end = .; 34 * 35 * STABS_DEBUG 36 * DWARF_DEBUG 37 * ELF_DETAILS 38 * 39 * DISCARDS // must be the last 40 * } 41 * 42 * [__init_begin, __init_end] is the init section that may be freed after init 43 * // __init_begin and __init_end should be page aligned, so that we can 44 * // free the whole .init memory 45 * [_stext, _etext] is the text section 46 * [_sdata, _edata] is the data section 47 * 48 * Some of the included output section have their own set of constants. 49 * Examples are: [__initramfs_start, __initramfs_end] for initramfs and 50 * [__nosave_begin, __nosave_end] for the nosave data 51 */ 52 53 #include <asm-generic/codetag.lds.h> 54 55 #ifndef LOAD_OFFSET 56 #define LOAD_OFFSET 0 57 #endif 58 59 /* 60 * Only some architectures want to have the .notes segment visible in 61 * a separate PT_NOTE ELF Program Header. When this happens, it needs 62 * to be visible in both the kernel text's PT_LOAD and the PT_NOTE 63 * Program Headers. In this case, though, the PT_LOAD needs to be made 64 * the default again so that all the following sections don't also end 65 * up in the PT_NOTE Program Header. 66 */ 67 #ifdef EMITS_PT_NOTE 68 #define NOTES_HEADERS :text :note 69 #define NOTES_HEADERS_RESTORE __restore_ph : { *(.__restore_ph) } :text 70 #else 71 #define NOTES_HEADERS 72 #define NOTES_HEADERS_RESTORE 73 #endif 74 75 /* 76 * Some architectures have non-executable read-only exception tables. 77 * They can be added to the RO_DATA segment by specifying their desired 78 * alignment. 79 */ 80 #ifdef RO_EXCEPTION_TABLE_ALIGN 81 #define RO_EXCEPTION_TABLE EXCEPTION_TABLE(RO_EXCEPTION_TABLE_ALIGN) 82 #else 83 #define RO_EXCEPTION_TABLE 84 #endif 85 86 /* Align . function alignment. */ 87 #define ALIGN_FUNCTION() . = ALIGN(CONFIG_FUNCTION_ALIGNMENT) 88 89 /* 90 * Support -ffunction-sections by matching .text and .text.*, 91 * but exclude '.text..*', .text.startup[.*], and .text.exit[.*]. 92 * 93 * .text.startup and .text.startup.* are matched later by INIT_TEXT. 94 * .text.exit and .text.exit.* are matched later by EXIT_TEXT. 95 * 96 * Other .text.* sections that are typically grouped separately, such as 97 * .text.unlikely or .text.hot, must be matched explicitly before using 98 * TEXT_MAIN. 99 */ 100 #define TEXT_MAIN \ 101 .text \ 102 .text.[_0-9A-Za-df-rt-z]* \ 103 .text.s[_0-9A-Za-su-z]* \ 104 .text.st[_0-9A-Zb-z]* \ 105 .text.sta[_0-9A-Za-qs-z]* \ 106 .text.star[_0-9A-Za-su-z]* \ 107 .text.start[_0-9A-Za-tv-z]* \ 108 .text.startu[_0-9A-Za-oq-z]* \ 109 .text.startup[_0-9A-Za-z]* \ 110 .text.e[_0-9A-Za-wy-z]* \ 111 .text.ex[_0-9A-Za-hj-z]* \ 112 .text.exi[_0-9A-Za-su-z]* \ 113 .text.exit[_0-9A-Za-z]* 114 115 /* 116 * Support -fdata-sections by matching .data, .data.*, and others, 117 * but exclude '.data..*'. 118 */ 119 #define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data.rel.* .data..L* .data..compoundliteral* .data.$__unnamed_* .data.$L* 120 #define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]* 121 #define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]* .rodata..L* 122 #define BSS_MAIN .bss .bss.[0-9a-zA-Z_]* .bss..L* .bss..compoundliteral* 123 #define SBSS_MAIN .sbss .sbss.[0-9a-zA-Z_]* 124 125 /* 126 * GCC 4.5 and later have a 32 bytes section alignment for structures. 127 * Except GCC 4.9, that feels the need to align on 64 bytes. 128 */ 129 #define STRUCT_ALIGNMENT 32 130 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT) 131 132 /* 133 * The order of the sched class addresses are important, as they are 134 * used to determine the order of the priority of each sched class in 135 * relation to each other. 136 */ 137 #define SCHED_DATA \ 138 STRUCT_ALIGN(); \ 139 __sched_class_highest = .; \ 140 *(__stop_sched_class) \ 141 *(__dl_sched_class) \ 142 *(__rt_sched_class) \ 143 *(__fair_sched_class) \ 144 *(__ext_sched_class) \ 145 *(__idle_sched_class) \ 146 __sched_class_lowest = .; 147 148 /* The actual configuration determine if the init/exit sections 149 * are handled as text/data or they can be discarded (which 150 * often happens at runtime) 151 */ 152 153 #ifndef CONFIG_HAVE_DYNAMIC_FTRACE_NO_PATCHABLE 154 #define KEEP_PATCHABLE KEEP(*(__patchable_function_entries)) 155 #define PATCHABLE_DISCARDS 156 #else 157 #define KEEP_PATCHABLE 158 #define PATCHABLE_DISCARDS *(__patchable_function_entries) 159 #endif 160 161 #ifndef CONFIG_ARCH_SUPPORTS_CFI 162 /* 163 * Simply points to ftrace_stub, but with the proper protocol. 164 * Defined by the linker script in linux/vmlinux.lds.h 165 */ 166 #define FTRACE_STUB_HACK ftrace_stub_graph = ftrace_stub; 167 #else 168 #define FTRACE_STUB_HACK 169 #endif 170 171 #ifdef CONFIG_DYNAMIC_FTRACE 172 /* 173 * The ftrace call sites are logged to a section whose name depends on the 174 * compiler option used. A given kernel image will only use one, AKA 175 * FTRACE_CALLSITE_SECTION. We capture all of them here to avoid header 176 * dependencies for FTRACE_CALLSITE_SECTION's definition. 177 * 178 * ftrace_ops_list_func will be defined as arch_ftrace_ops_list_func 179 * as some archs will have a different prototype for that function 180 * but ftrace_ops_list_func() will have a single prototype. 181 */ 182 #define MCOUNT_REC() . = ALIGN(8); \ 183 __start_mcount_loc = .; \ 184 KEEP(*(__mcount_loc)) \ 185 KEEP_PATCHABLE \ 186 __stop_mcount_loc = .; \ 187 FTRACE_STUB_HACK \ 188 ftrace_ops_list_func = arch_ftrace_ops_list_func; 189 #else 190 # ifdef CONFIG_FUNCTION_TRACER 191 # define MCOUNT_REC() FTRACE_STUB_HACK \ 192 ftrace_ops_list_func = arch_ftrace_ops_list_func; 193 # else 194 # define MCOUNT_REC() 195 # endif 196 #endif 197 198 #define BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_) \ 199 _BEGIN_##_label_ = .; \ 200 KEEP(*(_sec_)) \ 201 _END_##_label_ = .; 202 203 #define BOUNDED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_) \ 204 _label_##_BEGIN_ = .; \ 205 KEEP(*(_sec_)) \ 206 _label_##_END_ = .; 207 208 #define BOUNDED_SECTION_BY(_sec_, _label_) \ 209 BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, __start, __stop) 210 211 #define BOUNDED_SECTION(_sec) BOUNDED_SECTION_BY(_sec, _sec) 212 213 #define HEADERED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_, _HDR_) \ 214 _HDR_##_label_ = .; \ 215 KEEP(*(.gnu.linkonce.##_sec_)) \ 216 BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_) 217 218 #define HEADERED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_, _HDR_) \ 219 _label_##_HDR_ = .; \ 220 KEEP(*(.gnu.linkonce.##_sec_)) \ 221 BOUNDED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_) 222 223 #define HEADERED_SECTION_BY(_sec_, _label_) \ 224 HEADERED_SECTION_PRE_LABEL(_sec_, _label_, __start, __stop) 225 226 #define HEADERED_SECTION(_sec) HEADERED_SECTION_BY(_sec, _sec) 227 228 #ifdef CONFIG_TRACE_BRANCH_PROFILING 229 #define LIKELY_PROFILE() \ 230 BOUNDED_SECTION_BY(_ftrace_annotated_branch, _annotated_branch_profile) 231 #else 232 #define LIKELY_PROFILE() 233 #endif 234 235 #ifdef CONFIG_PROFILE_ALL_BRANCHES 236 #define BRANCH_PROFILE() \ 237 BOUNDED_SECTION_BY(_ftrace_branch, _branch_profile) 238 #else 239 #define BRANCH_PROFILE() 240 #endif 241 242 #ifdef CONFIG_KPROBES 243 #define KPROBE_BLACKLIST() \ 244 . = ALIGN(8); \ 245 BOUNDED_SECTION(_kprobe_blacklist) 246 #else 247 #define KPROBE_BLACKLIST() 248 #endif 249 250 #ifdef CONFIG_FUNCTION_ERROR_INJECTION 251 #define ERROR_INJECT_WHITELIST() \ 252 STRUCT_ALIGN(); \ 253 BOUNDED_SECTION(_error_injection_whitelist) 254 #else 255 #define ERROR_INJECT_WHITELIST() 256 #endif 257 258 #ifdef CONFIG_EVENT_TRACING 259 #define FTRACE_EVENTS() \ 260 . = ALIGN(8); \ 261 BOUNDED_SECTION(_ftrace_events) \ 262 BOUNDED_SECTION_BY(_ftrace_eval_map, _ftrace_eval_maps) 263 #else 264 #define FTRACE_EVENTS() 265 #endif 266 267 #ifdef CONFIG_TRACING 268 #define TRACE_PRINTKS() BOUNDED_SECTION_BY(__trace_printk_fmt, ___trace_bprintk_fmt) 269 #define TRACEPOINT_STR() BOUNDED_SECTION_BY(__tracepoint_str, ___tracepoint_str) 270 #else 271 #define TRACE_PRINTKS() 272 #define TRACEPOINT_STR() 273 #endif 274 275 #ifdef CONFIG_FTRACE_SYSCALLS 276 #define TRACE_SYSCALLS() \ 277 . = ALIGN(8); \ 278 BOUNDED_SECTION_BY(__syscalls_metadata, _syscalls_metadata) 279 #else 280 #define TRACE_SYSCALLS() 281 #endif 282 283 #ifdef CONFIG_BPF_EVENTS 284 #define BPF_RAW_TP() STRUCT_ALIGN(); \ 285 BOUNDED_SECTION_BY(__bpf_raw_tp_map, __bpf_raw_tp) 286 #else 287 #define BPF_RAW_TP() 288 #endif 289 290 #ifdef CONFIG_SERIAL_EARLYCON 291 #define EARLYCON_TABLE() \ 292 . = ALIGN(8); \ 293 BOUNDED_SECTION_POST_LABEL(__earlycon_table, __earlycon_table, , _end) 294 #else 295 #define EARLYCON_TABLE() 296 #endif 297 298 #ifdef CONFIG_SECURITY 299 #define LSM_TABLE() \ 300 . = ALIGN(8); \ 301 BOUNDED_SECTION_PRE_LABEL(.lsm_info.init, _lsm_info, __start, __end) 302 303 #define EARLY_LSM_TABLE() \ 304 . = ALIGN(8); \ 305 BOUNDED_SECTION_PRE_LABEL(.early_lsm_info.init, _early_lsm_info, __start, __end) 306 #else 307 #define LSM_TABLE() 308 #define EARLY_LSM_TABLE() 309 #endif 310 311 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name) 312 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name) 313 #define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name) 314 #define _OF_TABLE_0(name) 315 #define _OF_TABLE_1(name) \ 316 . = ALIGN(8); \ 317 __##name##_of_table = .; \ 318 KEEP(*(__##name##_of_table)) \ 319 KEEP(*(__##name##_of_table_end)) 320 321 #define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer) 322 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip) 323 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk) 324 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem) 325 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method) 326 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method) 327 328 #ifdef CONFIG_ACPI 329 #define ACPI_PROBE_TABLE(name) \ 330 . = ALIGN(8); \ 331 BOUNDED_SECTION_POST_LABEL(__##name##_acpi_probe_table, \ 332 __##name##_acpi_probe_table,, _end) 333 #else 334 #define ACPI_PROBE_TABLE(name) 335 #endif 336 337 #ifdef CONFIG_THERMAL 338 #define THERMAL_TABLE(name) \ 339 . = ALIGN(8); \ 340 BOUNDED_SECTION_POST_LABEL(__##name##_thermal_table, \ 341 __##name##_thermal_table,, _end) 342 #else 343 #define THERMAL_TABLE(name) 344 #endif 345 346 #define KERNEL_DTB() \ 347 STRUCT_ALIGN(); \ 348 __dtb_start = .; \ 349 KEEP(*(.dtb.init.rodata)) \ 350 __dtb_end = .; 351 352 /* 353 * .data section 354 */ 355 #define DATA_DATA \ 356 *(.xiptext) \ 357 *(DATA_MAIN) \ 358 *(.data..decrypted) \ 359 *(.ref.data) \ 360 *(.data..shared_aligned) /* percpu related */ \ 361 *(.data..unlikely) \ 362 __start_once = .; \ 363 *(.data..once) \ 364 __end_once = .; \ 365 *(.data..do_once) \ 366 STRUCT_ALIGN(); \ 367 *(__tracepoints) \ 368 /* implement dynamic printk debug */ \ 369 . = ALIGN(8); \ 370 BOUNDED_SECTION_BY(__dyndbg_classes, ___dyndbg_classes) \ 371 BOUNDED_SECTION_BY(__dyndbg, ___dyndbg) \ 372 CODETAG_SECTIONS() \ 373 LIKELY_PROFILE() \ 374 BRANCH_PROFILE() \ 375 TRACE_PRINTKS() \ 376 BPF_RAW_TP() \ 377 TRACEPOINT_STR() \ 378 KUNIT_TABLE() 379 380 /* 381 * Data section helpers 382 */ 383 #define NOSAVE_DATA \ 384 . = ALIGN(PAGE_SIZE); \ 385 __nosave_begin = .; \ 386 *(.data..nosave) \ 387 . = ALIGN(PAGE_SIZE); \ 388 __nosave_end = .; 389 390 #define CACHE_HOT_DATA(align) \ 391 . = ALIGN(align); \ 392 *(SORT_BY_ALIGNMENT(.data..hot.*)) \ 393 . = ALIGN(align); 394 395 #define PAGE_ALIGNED_DATA(page_align) \ 396 . = ALIGN(page_align); \ 397 *(.data..page_aligned) \ 398 . = ALIGN(page_align); 399 400 #define READ_MOSTLY_DATA(align) \ 401 . = ALIGN(align); \ 402 *(.data..read_mostly) \ 403 . = ALIGN(align); 404 405 #define CACHELINE_ALIGNED_DATA(align) \ 406 . = ALIGN(align); \ 407 *(.data..cacheline_aligned) 408 409 #define INIT_TASK_DATA(align) \ 410 . = ALIGN(align); \ 411 __start_init_stack = .; \ 412 init_thread_union = .; \ 413 init_stack = .; \ 414 KEEP(*(.data..init_thread_info)) \ 415 . = __start_init_stack + THREAD_SIZE; \ 416 __end_init_stack = .; 417 418 #define JUMP_TABLE_DATA \ 419 . = ALIGN(8); \ 420 BOUNDED_SECTION_BY(__jump_table, ___jump_table) 421 422 #ifdef CONFIG_HAVE_STATIC_CALL_INLINE 423 #define STATIC_CALL_DATA \ 424 . = ALIGN(8); \ 425 BOUNDED_SECTION_BY(.static_call_sites, _static_call_sites) \ 426 BOUNDED_SECTION_BY(.static_call_tramp_key, _static_call_tramp_key) 427 #else 428 #define STATIC_CALL_DATA 429 #endif 430 431 /* 432 * Allow architectures to handle ro_after_init data on their 433 * own by defining an empty RO_AFTER_INIT_DATA. 434 */ 435 #ifndef RO_AFTER_INIT_DATA 436 #define RO_AFTER_INIT_DATA \ 437 . = ALIGN(8); \ 438 __start_ro_after_init = .; \ 439 *(.data..ro_after_init) \ 440 JUMP_TABLE_DATA \ 441 STATIC_CALL_DATA \ 442 __end_ro_after_init = .; 443 #endif 444 445 /* 446 * .kcfi_traps contains a list KCFI trap locations. 447 */ 448 #ifndef KCFI_TRAPS 449 #ifdef CONFIG_ARCH_USES_CFI_TRAPS 450 #define KCFI_TRAPS \ 451 __kcfi_traps : AT(ADDR(__kcfi_traps) - LOAD_OFFSET) { \ 452 BOUNDED_SECTION_BY(.kcfi_traps, ___kcfi_traps) \ 453 } 454 #else 455 #define KCFI_TRAPS 456 #endif 457 #endif 458 459 /* 460 * Read only Data 461 */ 462 #define RO_DATA(align) \ 463 . = ALIGN((align)); \ 464 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 465 __start_rodata = .; \ 466 *(.rodata) *(.rodata.*) *(.data.rel.ro*) \ 467 SCHED_DATA \ 468 RO_AFTER_INIT_DATA /* Read only after init */ \ 469 . = ALIGN(8); \ 470 BOUNDED_SECTION_BY(__tracepoints_ptrs, ___tracepoints_ptrs) \ 471 *(__tracepoints_strings)/* Tracepoints: strings */ \ 472 } \ 473 \ 474 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 475 *(.rodata1) \ 476 } \ 477 \ 478 /* PCI quirks */ \ 479 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 480 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_early, _pci_fixups_early, __start, __end) \ 481 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_header, _pci_fixups_header, __start, __end) \ 482 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_final, _pci_fixups_final, __start, __end) \ 483 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_enable, _pci_fixups_enable, __start, __end) \ 484 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_resume, _pci_fixups_resume, __start, __end) \ 485 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_suspend, _pci_fixups_suspend, __start, __end) \ 486 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_resume_early, _pci_fixups_resume_early, __start, __end) \ 487 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_suspend_late, _pci_fixups_suspend_late, __start, __end) \ 488 } \ 489 \ 490 FW_LOADER_BUILT_IN_DATA \ 491 TRACEDATA \ 492 \ 493 PRINTK_INDEX \ 494 \ 495 /* Kernel symbol table: Normal symbols */ \ 496 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 497 __start___ksymtab = .; \ 498 KEEP(*(SORT(___ksymtab+*))) \ 499 __stop___ksymtab = .; \ 500 } \ 501 \ 502 /* Kernel symbol table: GPL-only symbols */ \ 503 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 504 __start___ksymtab_gpl = .; \ 505 KEEP(*(SORT(___ksymtab_gpl+*))) \ 506 __stop___ksymtab_gpl = .; \ 507 } \ 508 \ 509 /* Kernel symbol table: Normal symbols */ \ 510 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 511 __start___kcrctab = .; \ 512 KEEP(*(SORT(___kcrctab+*))) \ 513 __stop___kcrctab = .; \ 514 } \ 515 \ 516 /* Kernel symbol table: GPL-only symbols */ \ 517 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 518 __start___kcrctab_gpl = .; \ 519 KEEP(*(SORT(___kcrctab_gpl+*))) \ 520 __stop___kcrctab_gpl = .; \ 521 } \ 522 \ 523 /* Kernel symbol table: strings */ \ 524 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 525 *(__ksymtab_strings) \ 526 } \ 527 \ 528 /* __*init sections */ \ 529 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 530 *(.ref.rodata) \ 531 } \ 532 \ 533 /* Built-in module parameters. */ \ 534 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 535 BOUNDED_SECTION_BY(__param, ___param) \ 536 } \ 537 \ 538 /* Built-in module versions. */ \ 539 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 540 BOUNDED_SECTION_BY(__modver, ___modver) \ 541 } \ 542 \ 543 KCFI_TRAPS \ 544 \ 545 RO_EXCEPTION_TABLE \ 546 NOTES \ 547 BTF \ 548 \ 549 . = ALIGN((align)); \ 550 __end_rodata = .; 551 552 553 /* 554 * Non-instrumentable text section 555 */ 556 #define NOINSTR_TEXT \ 557 ALIGN_FUNCTION(); \ 558 __noinstr_text_start = .; \ 559 *(.noinstr.text) \ 560 __cpuidle_text_start = .; \ 561 *(.cpuidle.text) \ 562 __cpuidle_text_end = .; \ 563 __noinstr_text_end = .; 564 565 #define TEXT_SPLIT \ 566 __split_text_start = .; \ 567 *(.text.split .text.split.[0-9a-zA-Z_]*) \ 568 __split_text_end = .; 569 570 #define TEXT_UNLIKELY \ 571 __unlikely_text_start = .; \ 572 *(.text.unlikely .text.unlikely.*) \ 573 __unlikely_text_end = .; 574 575 #define TEXT_HOT \ 576 __hot_text_start = .; \ 577 *(.text.hot .text.hot.*) \ 578 __hot_text_end = .; 579 580 /* 581 * .text section. Map to function alignment to avoid address changes 582 * during second ld run in second ld pass when generating System.map 583 * 584 * TEXT_MAIN here will match symbols with a fixed pattern (for example, 585 * .text.hot or .text.unlikely). Match those before TEXT_MAIN to ensure 586 * they get grouped together. 587 * 588 * Also placing .text.hot section at the beginning of a page, this 589 * would help the TLB performance. 590 */ 591 #define TEXT_TEXT \ 592 ALIGN_FUNCTION(); \ 593 *(.text.asan.* .text.tsan.*) \ 594 *(.text.unknown .text.unknown.*) \ 595 TEXT_SPLIT \ 596 TEXT_UNLIKELY \ 597 . = ALIGN(PAGE_SIZE); \ 598 TEXT_HOT \ 599 *(TEXT_MAIN .text.fixup) \ 600 NOINSTR_TEXT \ 601 *(.ref.text) 602 603 /* sched.text is aling to function alignment to secure we have same 604 * address even at second ld pass when generating System.map */ 605 #define SCHED_TEXT \ 606 ALIGN_FUNCTION(); \ 607 __sched_text_start = .; \ 608 *(.sched.text) \ 609 __sched_text_end = .; 610 611 /* spinlock.text is aling to function alignment to secure we have same 612 * address even at second ld pass when generating System.map */ 613 #define LOCK_TEXT \ 614 ALIGN_FUNCTION(); \ 615 __lock_text_start = .; \ 616 *(.spinlock.text) \ 617 __lock_text_end = .; 618 619 #define KPROBES_TEXT \ 620 ALIGN_FUNCTION(); \ 621 __kprobes_text_start = .; \ 622 *(.kprobes.text) \ 623 __kprobes_text_end = .; 624 625 #define ENTRY_TEXT \ 626 ALIGN_FUNCTION(); \ 627 __entry_text_start = .; \ 628 *(.entry.text) \ 629 __entry_text_end = .; 630 631 #define IRQENTRY_TEXT \ 632 ALIGN_FUNCTION(); \ 633 __irqentry_text_start = .; \ 634 *(.irqentry.text) \ 635 __irqentry_text_end = .; 636 637 #define SOFTIRQENTRY_TEXT \ 638 ALIGN_FUNCTION(); \ 639 __softirqentry_text_start = .; \ 640 *(.softirqentry.text) \ 641 __softirqentry_text_end = .; 642 643 #define STATIC_CALL_TEXT \ 644 ALIGN_FUNCTION(); \ 645 __static_call_text_start = .; \ 646 *(.static_call.text) \ 647 __static_call_text_end = .; 648 649 /* Section used for early init (in .S files) */ 650 #define HEAD_TEXT KEEP(*(.head.text)) 651 652 #define HEAD_TEXT_SECTION \ 653 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 654 HEAD_TEXT \ 655 } 656 657 /* 658 * Exception table 659 */ 660 #define EXCEPTION_TABLE(align) \ 661 . = ALIGN(align); \ 662 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 663 BOUNDED_SECTION_BY(__ex_table, ___ex_table) \ 664 } 665 666 /* 667 * .BTF 668 */ 669 #ifdef CONFIG_DEBUG_INFO_BTF 670 #define BTF \ 671 . = ALIGN(PAGE_SIZE); \ 672 .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \ 673 BOUNDED_SECTION_BY(.BTF, _BTF) \ 674 } \ 675 . = ALIGN(PAGE_SIZE); \ 676 .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) { \ 677 *(.BTF_ids) \ 678 } 679 #else 680 #define BTF 681 #endif 682 683 /* 684 * Init task 685 */ 686 #define INIT_TASK_DATA_SECTION(align) \ 687 . = ALIGN(align); \ 688 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 689 INIT_TASK_DATA(align) \ 690 } 691 692 #ifdef CONFIG_CONSTRUCTORS 693 #define KERNEL_CTORS() . = ALIGN(8); \ 694 __ctors_start = .; \ 695 KEEP(*(SORT(.ctors.*))) \ 696 KEEP(*(.ctors)) \ 697 KEEP(*(SORT(.init_array.*))) \ 698 KEEP(*(.init_array)) \ 699 __ctors_end = .; 700 #else 701 #define KERNEL_CTORS() 702 #endif 703 704 /* init and exit section handling */ 705 #define INIT_DATA \ 706 KEEP(*(SORT(___kentry+*))) \ 707 *(.init.data .init.data.*) \ 708 KERNEL_CTORS() \ 709 MCOUNT_REC() \ 710 *(.init.rodata .init.rodata.*) \ 711 FTRACE_EVENTS() \ 712 TRACE_SYSCALLS() \ 713 KPROBE_BLACKLIST() \ 714 ERROR_INJECT_WHITELIST() \ 715 CLK_OF_TABLES() \ 716 RESERVEDMEM_OF_TABLES() \ 717 TIMER_OF_TABLES() \ 718 CPU_METHOD_OF_TABLES() \ 719 CPUIDLE_METHOD_OF_TABLES() \ 720 KERNEL_DTB() \ 721 IRQCHIP_OF_MATCH_TABLE() \ 722 ACPI_PROBE_TABLE(irqchip) \ 723 ACPI_PROBE_TABLE(timer) \ 724 THERMAL_TABLE(governor) \ 725 EARLYCON_TABLE() \ 726 LSM_TABLE() \ 727 EARLY_LSM_TABLE() \ 728 KUNIT_INIT_TABLE() 729 730 #define INIT_TEXT \ 731 *(.init.text .init.text.*) \ 732 *(.text.startup .text.startup.*) 733 734 #define EXIT_DATA \ 735 *(.exit.data .exit.data.*) \ 736 *(.fini_array .fini_array.*) \ 737 *(.dtors .dtors.*) 738 739 #define EXIT_TEXT \ 740 *(.exit.text) \ 741 *(.text.exit .text.exit.*) 742 743 #define EXIT_CALL \ 744 *(.exitcall.exit) 745 746 /* 747 * bss (Block Started by Symbol) - uninitialized data 748 * zeroed during startup 749 */ 750 #define SBSS(sbss_align) \ 751 . = ALIGN(sbss_align); \ 752 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 753 *(.dynsbss) \ 754 *(SBSS_MAIN) \ 755 *(.scommon) \ 756 } 757 758 /* 759 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 760 * sections to the front of bss. 761 */ 762 #ifndef BSS_FIRST_SECTIONS 763 #define BSS_FIRST_SECTIONS 764 #endif 765 766 #define BSS(bss_align) \ 767 . = ALIGN(bss_align); \ 768 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 769 BSS_FIRST_SECTIONS \ 770 . = ALIGN(PAGE_SIZE); \ 771 *(.bss..page_aligned) \ 772 . = ALIGN(PAGE_SIZE); \ 773 *(.dynbss) \ 774 *(BSS_MAIN) \ 775 *(COMMON) \ 776 } 777 778 /* 779 * DWARF debug sections. 780 * Symbols in the DWARF debugging sections are relative to 781 * the beginning of the section so we begin them at 0. 782 */ 783 #define DWARF_DEBUG \ 784 /* DWARF 1 */ \ 785 .debug 0 : { *(.debug) } \ 786 .line 0 : { *(.line) } \ 787 /* GNU DWARF 1 extensions */ \ 788 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 789 .debug_sfnames 0 : { *(.debug_sfnames) } \ 790 /* DWARF 1.1 and DWARF 2 */ \ 791 .debug_aranges 0 : { *(.debug_aranges) } \ 792 .debug_pubnames 0 : { *(.debug_pubnames) } \ 793 /* DWARF 2 */ \ 794 .debug_info 0 : { *(.debug_info \ 795 .gnu.linkonce.wi.*) } \ 796 .debug_abbrev 0 : { *(.debug_abbrev) } \ 797 .debug_line 0 : { *(.debug_line) } \ 798 .debug_frame 0 : { *(.debug_frame) } \ 799 .debug_str 0 : { *(.debug_str) } \ 800 .debug_loc 0 : { *(.debug_loc) } \ 801 .debug_macinfo 0 : { *(.debug_macinfo) } \ 802 .debug_pubtypes 0 : { *(.debug_pubtypes) } \ 803 /* DWARF 3 */ \ 804 .debug_ranges 0 : { *(.debug_ranges) } \ 805 /* SGI/MIPS DWARF 2 extensions */ \ 806 .debug_weaknames 0 : { *(.debug_weaknames) } \ 807 .debug_funcnames 0 : { *(.debug_funcnames) } \ 808 .debug_typenames 0 : { *(.debug_typenames) } \ 809 .debug_varnames 0 : { *(.debug_varnames) } \ 810 /* GNU DWARF 2 extensions */ \ 811 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \ 812 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \ 813 /* DWARF 4 */ \ 814 .debug_types 0 : { *(.debug_types) } \ 815 /* DWARF 5 */ \ 816 .debug_addr 0 : { *(.debug_addr) } \ 817 .debug_line_str 0 : { *(.debug_line_str) } \ 818 .debug_loclists 0 : { *(.debug_loclists) } \ 819 .debug_macro 0 : { *(.debug_macro) } \ 820 .debug_names 0 : { *(.debug_names) } \ 821 .debug_rnglists 0 : { *(.debug_rnglists) } \ 822 .debug_str_offsets 0 : { *(.debug_str_offsets) } 823 824 /* Stabs debugging sections. */ 825 #define STABS_DEBUG \ 826 .stab 0 : { *(.stab) } \ 827 .stabstr 0 : { *(.stabstr) } \ 828 .stab.excl 0 : { *(.stab.excl) } \ 829 .stab.exclstr 0 : { *(.stab.exclstr) } \ 830 .stab.index 0 : { *(.stab.index) } \ 831 .stab.indexstr 0 : { *(.stab.indexstr) } 832 833 /* Required sections not related to debugging. */ 834 #define ELF_DETAILS \ 835 .modinfo : { *(.modinfo) } \ 836 .comment 0 : { *(.comment) } \ 837 .symtab 0 : { *(.symtab) } \ 838 .strtab 0 : { *(.strtab) } \ 839 .shstrtab 0 : { *(.shstrtab) } 840 841 #ifdef CONFIG_GENERIC_BUG 842 #define BUG_TABLE \ 843 . = ALIGN(8); \ 844 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 845 BOUNDED_SECTION_BY(__bug_table, ___bug_table) \ 846 } 847 #else 848 #define BUG_TABLE 849 #endif 850 851 #ifdef CONFIG_UNWINDER_ORC 852 #define ORC_UNWIND_TABLE \ 853 .orc_header : AT(ADDR(.orc_header) - LOAD_OFFSET) { \ 854 BOUNDED_SECTION_BY(.orc_header, _orc_header) \ 855 } \ 856 . = ALIGN(4); \ 857 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \ 858 BOUNDED_SECTION_BY(.orc_unwind_ip, _orc_unwind_ip) \ 859 } \ 860 . = ALIGN(2); \ 861 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \ 862 BOUNDED_SECTION_BY(.orc_unwind, _orc_unwind) \ 863 } \ 864 text_size = _etext - _stext; \ 865 . = ALIGN(4); \ 866 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \ 867 orc_lookup = .; \ 868 . += (((text_size + LOOKUP_BLOCK_SIZE - 1) / \ 869 LOOKUP_BLOCK_SIZE) + 1) * 4; \ 870 orc_lookup_end = .; \ 871 } 872 #else 873 #define ORC_UNWIND_TABLE 874 #endif 875 876 /* Built-in firmware blobs */ 877 #ifdef CONFIG_FW_LOADER 878 #define FW_LOADER_BUILT_IN_DATA \ 879 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) { \ 880 BOUNDED_SECTION_PRE_LABEL(.builtin_fw, _builtin_fw, __start, __end) \ 881 } 882 #else 883 #define FW_LOADER_BUILT_IN_DATA 884 #endif 885 886 #ifdef CONFIG_PM_TRACE 887 #define TRACEDATA \ 888 . = ALIGN(4); \ 889 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 890 BOUNDED_SECTION_POST_LABEL(.tracedata, __tracedata, _start, _end) \ 891 } 892 #else 893 #define TRACEDATA 894 #endif 895 896 #ifdef CONFIG_PRINTK_INDEX 897 #define PRINTK_INDEX \ 898 .printk_index : AT(ADDR(.printk_index) - LOAD_OFFSET) { \ 899 BOUNDED_SECTION_BY(.printk_index, _printk_index) \ 900 } 901 #else 902 #define PRINTK_INDEX 903 #endif 904 905 /* 906 * Discard .note.GNU-stack, which is emitted as PROGBITS by the compiler. 907 * Otherwise, the type of .notes section would become PROGBITS instead of NOTES. 908 * 909 * Also, discard .note.gnu.property, otherwise it forces the notes section to 910 * be 8-byte aligned which causes alignment mismatches with the kernel's custom 911 * 4-byte aligned notes. 912 */ 913 #define NOTES \ 914 /DISCARD/ : { \ 915 *(.note.GNU-stack) \ 916 *(.note.gnu.property) \ 917 } \ 918 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 919 BOUNDED_SECTION_BY(.note.*, _notes) \ 920 } NOTES_HEADERS \ 921 NOTES_HEADERS_RESTORE 922 923 #define INIT_SETUP(initsetup_align) \ 924 . = ALIGN(initsetup_align); \ 925 BOUNDED_SECTION_POST_LABEL(.init.setup, __setup, _start, _end) 926 927 #define INIT_CALLS_LEVEL(level) \ 928 __initcall##level##_start = .; \ 929 KEEP(*(.initcall##level##.init)) \ 930 KEEP(*(.initcall##level##s.init)) \ 931 932 #define INIT_CALLS \ 933 __initcall_start = .; \ 934 KEEP(*(.initcallearly.init)) \ 935 INIT_CALLS_LEVEL(0) \ 936 INIT_CALLS_LEVEL(1) \ 937 INIT_CALLS_LEVEL(2) \ 938 INIT_CALLS_LEVEL(3) \ 939 INIT_CALLS_LEVEL(4) \ 940 INIT_CALLS_LEVEL(5) \ 941 INIT_CALLS_LEVEL(rootfs) \ 942 INIT_CALLS_LEVEL(6) \ 943 INIT_CALLS_LEVEL(7) \ 944 __initcall_end = .; 945 946 #define CON_INITCALL \ 947 BOUNDED_SECTION_POST_LABEL(.con_initcall.init, __con_initcall, _start, _end) 948 949 #define NAMED_SECTION(name) \ 950 . = ALIGN(8); \ 951 name : AT(ADDR(name) - LOAD_OFFSET) \ 952 { BOUNDED_SECTION_PRE_LABEL(name, name, __start_, __stop_) } 953 954 #define RUNTIME_CONST(t,x) NAMED_SECTION(runtime_##t##_##x) 955 956 #define RUNTIME_CONST_VARIABLES \ 957 RUNTIME_CONST(shift, d_hash_shift) \ 958 RUNTIME_CONST(ptr, dentry_hashtable) 959 960 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */ 961 #define KUNIT_TABLE() \ 962 . = ALIGN(8); \ 963 BOUNDED_SECTION_POST_LABEL(.kunit_test_suites, __kunit_suites, _start, _end) 964 965 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */ 966 #define KUNIT_INIT_TABLE() \ 967 . = ALIGN(8); \ 968 BOUNDED_SECTION_POST_LABEL(.kunit_init_test_suites, \ 969 __kunit_init_suites, _start, _end) 970 971 #ifdef CONFIG_BLK_DEV_INITRD 972 #define INIT_RAM_FS \ 973 . = ALIGN(4); \ 974 __initramfs_start = .; \ 975 KEEP(*(.init.ramfs)) \ 976 . = ALIGN(8); \ 977 KEEP(*(.init.ramfs.info)) 978 #else 979 #define INIT_RAM_FS 980 #endif 981 982 /* 983 * Memory encryption operates on a page basis. Since we need to clear 984 * the memory encryption mask for this section, it needs to be aligned 985 * on a page boundary and be a page-size multiple in length. 986 * 987 * Note: We use a separate section so that only this section gets 988 * decrypted to avoid exposing more than we wish. 989 */ 990 #ifdef CONFIG_AMD_MEM_ENCRYPT 991 #define PERCPU_DECRYPTED_SECTION \ 992 . = ALIGN(PAGE_SIZE); \ 993 *(.data..percpu..decrypted) \ 994 . = ALIGN(PAGE_SIZE); 995 #else 996 #define PERCPU_DECRYPTED_SECTION 997 #endif 998 999 1000 /* 1001 * Default discarded sections. 1002 * 1003 * Some archs want to discard exit text/data at runtime rather than 1004 * link time due to cross-section references such as alt instructions, 1005 * bug table, eh_frame, etc. DISCARDS must be the last of output 1006 * section definitions so that such archs put those in earlier section 1007 * definitions. 1008 */ 1009 #ifdef RUNTIME_DISCARD_EXIT 1010 #define EXIT_DISCARDS 1011 #else 1012 #define EXIT_DISCARDS \ 1013 EXIT_TEXT \ 1014 EXIT_DATA 1015 #endif 1016 1017 /* 1018 * Clang's -fprofile-arcs, -fsanitize=kernel-address, and 1019 * -fsanitize=thread produce unwanted sections (.eh_frame 1020 * and .init_array.*), but CONFIG_CONSTRUCTORS wants to 1021 * keep any .init_array.* sections. 1022 * https://llvm.org/pr46478 1023 */ 1024 #ifdef CONFIG_UNWIND_TABLES 1025 #define DISCARD_EH_FRAME 1026 #else 1027 #define DISCARD_EH_FRAME *(.eh_frame) 1028 #endif 1029 #if defined(CONFIG_GCOV_KERNEL) || defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN) 1030 # ifdef CONFIG_CONSTRUCTORS 1031 # define SANITIZER_DISCARDS \ 1032 DISCARD_EH_FRAME 1033 # else 1034 # define SANITIZER_DISCARDS \ 1035 *(.init_array) *(.init_array.*) \ 1036 DISCARD_EH_FRAME 1037 # endif 1038 #else 1039 # define SANITIZER_DISCARDS 1040 #endif 1041 1042 #define COMMON_DISCARDS \ 1043 SANITIZER_DISCARDS \ 1044 PATCHABLE_DISCARDS \ 1045 *(.discard) \ 1046 *(.discard.*) \ 1047 *(.export_symbol) \ 1048 *(.no_trim_symbol) \ 1049 /* ld.bfd warns about .gnu.version* even when not emitted */ \ 1050 *(.gnu.version*) \ 1051 1052 #define DISCARDS \ 1053 /DISCARD/ : { \ 1054 EXIT_DISCARDS \ 1055 EXIT_CALL \ 1056 COMMON_DISCARDS \ 1057 } 1058 1059 /** 1060 * PERCPU_INPUT - the percpu input sections 1061 * @cacheline: cacheline size 1062 * 1063 * The core percpu section names and core symbols which do not rely 1064 * directly upon load addresses. 1065 * 1066 * @cacheline is used to align subsections to avoid false cacheline 1067 * sharing between subsections for different purposes. 1068 */ 1069 #define PERCPU_INPUT(cacheline) \ 1070 __per_cpu_start = .; \ 1071 . = ALIGN(PAGE_SIZE); \ 1072 *(.data..percpu..page_aligned) \ 1073 . = ALIGN(cacheline); \ 1074 __per_cpu_hot_start = .; \ 1075 *(SORT_BY_ALIGNMENT(.data..percpu..hot.*)) \ 1076 __per_cpu_hot_end = .; \ 1077 . = ALIGN(cacheline); \ 1078 *(.data..percpu..read_mostly) \ 1079 . = ALIGN(cacheline); \ 1080 *(.data..percpu) \ 1081 *(.data..percpu..shared_aligned) \ 1082 PERCPU_DECRYPTED_SECTION \ 1083 __per_cpu_end = .; 1084 1085 /** 1086 * PERCPU_SECTION - define output section for percpu area 1087 * @cacheline: cacheline size 1088 * 1089 * Macro which expands to output section for percpu area. 1090 * 1091 * @cacheline is used to align subsections to avoid false cacheline 1092 * sharing between subsections for different purposes. 1093 */ 1094 #define PERCPU_SECTION(cacheline) \ 1095 . = ALIGN(PAGE_SIZE); \ 1096 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 1097 PERCPU_INPUT(cacheline) \ 1098 } 1099 1100 1101 /* 1102 * Definition of the high level *_SECTION macros 1103 * They will fit only a subset of the architectures 1104 */ 1105 1106 1107 /* 1108 * Writeable data. 1109 * All sections are combined in a single .data section. 1110 * The sections following CONSTRUCTORS are arranged so their 1111 * typical alignment matches. 1112 * A cacheline is typical/always less than a PAGE_SIZE so 1113 * the sections that has this restriction (or similar) 1114 * is located before the ones requiring PAGE_SIZE alignment. 1115 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 1116 * matches the requirement of PAGE_ALIGNED_DATA. 1117 * 1118 * use 0 as page_align if page_aligned data is not used */ 1119 #define RW_DATA(cacheline, pagealigned, inittask) \ 1120 . = ALIGN(PAGE_SIZE); \ 1121 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 1122 INIT_TASK_DATA(inittask) \ 1123 NOSAVE_DATA \ 1124 PAGE_ALIGNED_DATA(pagealigned) \ 1125 CACHE_HOT_DATA(cacheline) \ 1126 CACHELINE_ALIGNED_DATA(cacheline) \ 1127 READ_MOSTLY_DATA(cacheline) \ 1128 DATA_DATA \ 1129 CONSTRUCTORS \ 1130 } \ 1131 BUG_TABLE \ 1132 1133 #define INIT_TEXT_SECTION(inittext_align) \ 1134 . = ALIGN(inittext_align); \ 1135 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 1136 _sinittext = .; \ 1137 INIT_TEXT \ 1138 _einittext = .; \ 1139 } 1140 1141 #define INIT_DATA_SECTION(initsetup_align) \ 1142 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 1143 INIT_DATA \ 1144 INIT_SETUP(initsetup_align) \ 1145 INIT_CALLS \ 1146 CON_INITCALL \ 1147 INIT_RAM_FS \ 1148 } 1149 1150 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 1151 . = ALIGN(sbss_align); \ 1152 __bss_start = .; \ 1153 SBSS(sbss_align) \ 1154 BSS(bss_align) \ 1155 . = ALIGN(stop_align); \ 1156 __bss_stop = .; 1157