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 . to a 8 byte boundary equals to maximum function alignment. */ 85 #define ALIGN_FUNCTION() . = ALIGN(8) 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 #ifdef CONFIG_FTRACE_MCOUNT_RECORD 158 /* 159 * The ftrace call sites are logged to a section whose name depends on the 160 * compiler option used. A given kernel image will only use one, AKA 161 * FTRACE_CALLSITE_SECTION. We capture all of them here to avoid header 162 * dependencies for FTRACE_CALLSITE_SECTION's definition. 163 * 164 * Need to also make ftrace_stub_graph point to ftrace_stub 165 * so that the same stub location may have different protocols 166 * and not mess up with C verifiers. 167 * 168 * ftrace_ops_list_func will be defined as arch_ftrace_ops_list_func 169 * as some archs will have a different prototype for that function 170 * but ftrace_ops_list_func() will have a single prototype. 171 */ 172 #define MCOUNT_REC() . = ALIGN(8); \ 173 __start_mcount_loc = .; \ 174 KEEP(*(__mcount_loc)) \ 175 KEEP(*(__patchable_function_entries)) \ 176 __stop_mcount_loc = .; \ 177 ftrace_stub_graph = ftrace_stub; \ 178 ftrace_ops_list_func = arch_ftrace_ops_list_func; 179 #else 180 # ifdef CONFIG_FUNCTION_TRACER 181 # define MCOUNT_REC() ftrace_stub_graph = ftrace_stub; \ 182 ftrace_ops_list_func = arch_ftrace_ops_list_func; 183 # else 184 # define MCOUNT_REC() 185 # endif 186 #endif 187 188 #ifdef CONFIG_TRACE_BRANCH_PROFILING 189 #define LIKELY_PROFILE() __start_annotated_branch_profile = .; \ 190 KEEP(*(_ftrace_annotated_branch)) \ 191 __stop_annotated_branch_profile = .; 192 #else 193 #define LIKELY_PROFILE() 194 #endif 195 196 #ifdef CONFIG_PROFILE_ALL_BRANCHES 197 #define BRANCH_PROFILE() __start_branch_profile = .; \ 198 KEEP(*(_ftrace_branch)) \ 199 __stop_branch_profile = .; 200 #else 201 #define BRANCH_PROFILE() 202 #endif 203 204 #ifdef CONFIG_KPROBES 205 #define KPROBE_BLACKLIST() . = ALIGN(8); \ 206 __start_kprobe_blacklist = .; \ 207 KEEP(*(_kprobe_blacklist)) \ 208 __stop_kprobe_blacklist = .; 209 #else 210 #define KPROBE_BLACKLIST() 211 #endif 212 213 #ifdef CONFIG_FUNCTION_ERROR_INJECTION 214 #define ERROR_INJECT_WHITELIST() STRUCT_ALIGN(); \ 215 __start_error_injection_whitelist = .; \ 216 KEEP(*(_error_injection_whitelist)) \ 217 __stop_error_injection_whitelist = .; 218 #else 219 #define ERROR_INJECT_WHITELIST() 220 #endif 221 222 #ifdef CONFIG_EVENT_TRACING 223 #define FTRACE_EVENTS() . = ALIGN(8); \ 224 __start_ftrace_events = .; \ 225 KEEP(*(_ftrace_events)) \ 226 __stop_ftrace_events = .; \ 227 __start_ftrace_eval_maps = .; \ 228 KEEP(*(_ftrace_eval_map)) \ 229 __stop_ftrace_eval_maps = .; 230 #else 231 #define FTRACE_EVENTS() 232 #endif 233 234 #ifdef CONFIG_TRACING 235 #define TRACE_PRINTKS() __start___trace_bprintk_fmt = .; \ 236 KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \ 237 __stop___trace_bprintk_fmt = .; 238 #define TRACEPOINT_STR() __start___tracepoint_str = .; \ 239 KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \ 240 __stop___tracepoint_str = .; 241 #else 242 #define TRACE_PRINTKS() 243 #define TRACEPOINT_STR() 244 #endif 245 246 #ifdef CONFIG_FTRACE_SYSCALLS 247 #define TRACE_SYSCALLS() . = ALIGN(8); \ 248 __start_syscalls_metadata = .; \ 249 KEEP(*(__syscalls_metadata)) \ 250 __stop_syscalls_metadata = .; 251 #else 252 #define TRACE_SYSCALLS() 253 #endif 254 255 #ifdef CONFIG_BPF_EVENTS 256 #define BPF_RAW_TP() STRUCT_ALIGN(); \ 257 __start__bpf_raw_tp = .; \ 258 KEEP(*(__bpf_raw_tp_map)) \ 259 __stop__bpf_raw_tp = .; 260 #else 261 #define BPF_RAW_TP() 262 #endif 263 264 #ifdef CONFIG_SERIAL_EARLYCON 265 #define EARLYCON_TABLE() . = ALIGN(8); \ 266 __earlycon_table = .; \ 267 KEEP(*(__earlycon_table)) \ 268 __earlycon_table_end = .; 269 #else 270 #define EARLYCON_TABLE() 271 #endif 272 273 #ifdef CONFIG_SECURITY 274 #define LSM_TABLE() . = ALIGN(8); \ 275 __start_lsm_info = .; \ 276 KEEP(*(.lsm_info.init)) \ 277 __end_lsm_info = .; 278 #define EARLY_LSM_TABLE() . = ALIGN(8); \ 279 __start_early_lsm_info = .; \ 280 KEEP(*(.early_lsm_info.init)) \ 281 __end_early_lsm_info = .; 282 #else 283 #define LSM_TABLE() 284 #define EARLY_LSM_TABLE() 285 #endif 286 287 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name) 288 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name) 289 #define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name) 290 #define _OF_TABLE_0(name) 291 #define _OF_TABLE_1(name) \ 292 . = ALIGN(8); \ 293 __##name##_of_table = .; \ 294 KEEP(*(__##name##_of_table)) \ 295 KEEP(*(__##name##_of_table_end)) 296 297 #define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer) 298 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip) 299 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk) 300 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem) 301 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method) 302 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method) 303 304 #ifdef CONFIG_ACPI 305 #define ACPI_PROBE_TABLE(name) \ 306 . = ALIGN(8); \ 307 __##name##_acpi_probe_table = .; \ 308 KEEP(*(__##name##_acpi_probe_table)) \ 309 __##name##_acpi_probe_table_end = .; 310 #else 311 #define ACPI_PROBE_TABLE(name) 312 #endif 313 314 #ifdef CONFIG_THERMAL 315 #define THERMAL_TABLE(name) \ 316 . = ALIGN(8); \ 317 __##name##_thermal_table = .; \ 318 KEEP(*(__##name##_thermal_table)) \ 319 __##name##_thermal_table_end = .; 320 #else 321 #define THERMAL_TABLE(name) 322 #endif 323 324 #define KERNEL_DTB() \ 325 STRUCT_ALIGN(); \ 326 __dtb_start = .; \ 327 KEEP(*(.dtb.init.rodata)) \ 328 __dtb_end = .; 329 330 /* 331 * .data section 332 */ 333 #define DATA_DATA \ 334 *(.xiptext) \ 335 *(DATA_MAIN) \ 336 *(.ref.data) \ 337 *(.data..shared_aligned) /* percpu related */ \ 338 MEM_KEEP(init.data*) \ 339 MEM_KEEP(exit.data*) \ 340 *(.data.unlikely) \ 341 __start_once = .; \ 342 *(.data.once) \ 343 __end_once = .; \ 344 STRUCT_ALIGN(); \ 345 *(__tracepoints) \ 346 /* implement dynamic printk debug */ \ 347 . = ALIGN(8); \ 348 __start___dyndbg_classes = .; \ 349 KEEP(*(__dyndbg_classes)) \ 350 __stop___dyndbg_classes = .; \ 351 __start___dyndbg = .; \ 352 KEEP(*(__dyndbg)) \ 353 __stop___dyndbg = .; \ 354 LIKELY_PROFILE() \ 355 BRANCH_PROFILE() \ 356 TRACE_PRINTKS() \ 357 BPF_RAW_TP() \ 358 TRACEPOINT_STR() 359 360 /* 361 * Data section helpers 362 */ 363 #define NOSAVE_DATA \ 364 . = ALIGN(PAGE_SIZE); \ 365 __nosave_begin = .; \ 366 *(.data..nosave) \ 367 . = ALIGN(PAGE_SIZE); \ 368 __nosave_end = .; 369 370 #define PAGE_ALIGNED_DATA(page_align) \ 371 . = ALIGN(page_align); \ 372 *(.data..page_aligned) \ 373 . = ALIGN(page_align); 374 375 #define READ_MOSTLY_DATA(align) \ 376 . = ALIGN(align); \ 377 *(.data..read_mostly) \ 378 . = ALIGN(align); 379 380 #define CACHELINE_ALIGNED_DATA(align) \ 381 . = ALIGN(align); \ 382 *(.data..cacheline_aligned) 383 384 #define INIT_TASK_DATA(align) \ 385 . = ALIGN(align); \ 386 __start_init_task = .; \ 387 init_thread_union = .; \ 388 init_stack = .; \ 389 KEEP(*(.data..init_task)) \ 390 KEEP(*(.data..init_thread_info)) \ 391 . = __start_init_task + THREAD_SIZE; \ 392 __end_init_task = .; 393 394 #define JUMP_TABLE_DATA \ 395 . = ALIGN(8); \ 396 __start___jump_table = .; \ 397 KEEP(*(__jump_table)) \ 398 __stop___jump_table = .; 399 400 #ifdef CONFIG_HAVE_STATIC_CALL_INLINE 401 #define STATIC_CALL_DATA \ 402 . = ALIGN(8); \ 403 __start_static_call_sites = .; \ 404 KEEP(*(.static_call_sites)) \ 405 __stop_static_call_sites = .; \ 406 __start_static_call_tramp_key = .; \ 407 KEEP(*(.static_call_tramp_key)) \ 408 __stop_static_call_tramp_key = .; 409 #else 410 #define STATIC_CALL_DATA 411 #endif 412 413 /* 414 * Allow architectures to handle ro_after_init data on their 415 * own by defining an empty RO_AFTER_INIT_DATA. 416 */ 417 #ifndef RO_AFTER_INIT_DATA 418 #define RO_AFTER_INIT_DATA \ 419 . = ALIGN(8); \ 420 __start_ro_after_init = .; \ 421 *(.data..ro_after_init) \ 422 JUMP_TABLE_DATA \ 423 STATIC_CALL_DATA \ 424 __end_ro_after_init = .; 425 #endif 426 427 /* 428 * Read only Data 429 */ 430 #define RO_DATA(align) \ 431 . = ALIGN((align)); \ 432 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 433 __start_rodata = .; \ 434 *(.rodata) *(.rodata.*) \ 435 SCHED_DATA \ 436 RO_AFTER_INIT_DATA /* Read only after init */ \ 437 . = ALIGN(8); \ 438 __start___tracepoints_ptrs = .; \ 439 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \ 440 __stop___tracepoints_ptrs = .; \ 441 *(__tracepoints_strings)/* Tracepoints: strings */ \ 442 } \ 443 \ 444 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 445 *(.rodata1) \ 446 } \ 447 \ 448 /* PCI quirks */ \ 449 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 450 __start_pci_fixups_early = .; \ 451 KEEP(*(.pci_fixup_early)) \ 452 __end_pci_fixups_early = .; \ 453 __start_pci_fixups_header = .; \ 454 KEEP(*(.pci_fixup_header)) \ 455 __end_pci_fixups_header = .; \ 456 __start_pci_fixups_final = .; \ 457 KEEP(*(.pci_fixup_final)) \ 458 __end_pci_fixups_final = .; \ 459 __start_pci_fixups_enable = .; \ 460 KEEP(*(.pci_fixup_enable)) \ 461 __end_pci_fixups_enable = .; \ 462 __start_pci_fixups_resume = .; \ 463 KEEP(*(.pci_fixup_resume)) \ 464 __end_pci_fixups_resume = .; \ 465 __start_pci_fixups_resume_early = .; \ 466 KEEP(*(.pci_fixup_resume_early)) \ 467 __end_pci_fixups_resume_early = .; \ 468 __start_pci_fixups_suspend = .; \ 469 KEEP(*(.pci_fixup_suspend)) \ 470 __end_pci_fixups_suspend = .; \ 471 __start_pci_fixups_suspend_late = .; \ 472 KEEP(*(.pci_fixup_suspend_late)) \ 473 __end_pci_fixups_suspend_late = .; \ 474 } \ 475 \ 476 FW_LOADER_BUILT_IN_DATA \ 477 TRACEDATA \ 478 \ 479 PRINTK_INDEX \ 480 \ 481 /* Kernel symbol table: Normal symbols */ \ 482 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 483 __start___ksymtab = .; \ 484 KEEP(*(SORT(___ksymtab+*))) \ 485 __stop___ksymtab = .; \ 486 } \ 487 \ 488 /* Kernel symbol table: GPL-only symbols */ \ 489 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 490 __start___ksymtab_gpl = .; \ 491 KEEP(*(SORT(___ksymtab_gpl+*))) \ 492 __stop___ksymtab_gpl = .; \ 493 } \ 494 \ 495 /* Kernel symbol table: Normal symbols */ \ 496 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 497 __start___kcrctab = .; \ 498 KEEP(*(SORT(___kcrctab+*))) \ 499 __stop___kcrctab = .; \ 500 } \ 501 \ 502 /* Kernel symbol table: GPL-only symbols */ \ 503 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 504 __start___kcrctab_gpl = .; \ 505 KEEP(*(SORT(___kcrctab_gpl+*))) \ 506 __stop___kcrctab_gpl = .; \ 507 } \ 508 \ 509 /* Kernel symbol table: strings */ \ 510 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 511 *(__ksymtab_strings) \ 512 } \ 513 \ 514 /* __*init sections */ \ 515 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 516 *(.ref.rodata) \ 517 MEM_KEEP(init.rodata) \ 518 MEM_KEEP(exit.rodata) \ 519 } \ 520 \ 521 /* Built-in module parameters. */ \ 522 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 523 __start___param = .; \ 524 KEEP(*(__param)) \ 525 __stop___param = .; \ 526 } \ 527 \ 528 /* Built-in module versions. */ \ 529 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 530 __start___modver = .; \ 531 KEEP(*(__modver)) \ 532 __stop___modver = .; \ 533 } \ 534 \ 535 RO_EXCEPTION_TABLE \ 536 NOTES \ 537 BTF \ 538 \ 539 . = ALIGN((align)); \ 540 __end_rodata = .; 541 542 543 /* 544 * .text..L.cfi.jumptable.* contain Control-Flow Integrity (CFI) 545 * jump table entries. 546 */ 547 #ifdef CONFIG_CFI_CLANG 548 #define TEXT_CFI_JT \ 549 . = ALIGN(PMD_SIZE); \ 550 __cfi_jt_start = .; \ 551 *(.text..L.cfi.jumptable .text..L.cfi.jumptable.*) \ 552 . = ALIGN(PMD_SIZE); \ 553 __cfi_jt_end = .; 554 #else 555 #define TEXT_CFI_JT 556 #endif 557 558 /* 559 * Non-instrumentable text section 560 */ 561 #define NOINSTR_TEXT \ 562 ALIGN_FUNCTION(); \ 563 __noinstr_text_start = .; \ 564 *(.noinstr.text) \ 565 __noinstr_text_end = .; 566 567 /* 568 * .text section. Map to function alignment to avoid address changes 569 * during second ld run in second ld pass when generating System.map 570 * 571 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead 572 * code elimination is enabled, so these sections should be converted 573 * to use ".." first. 574 */ 575 #define TEXT_TEXT \ 576 ALIGN_FUNCTION(); \ 577 *(.text.hot .text.hot.*) \ 578 *(TEXT_MAIN .text.fixup) \ 579 *(.text.unlikely .text.unlikely.*) \ 580 *(.text.unknown .text.unknown.*) \ 581 NOINSTR_TEXT \ 582 *(.text..refcount) \ 583 *(.ref.text) \ 584 *(.text.asan.* .text.tsan.*) \ 585 TEXT_CFI_JT \ 586 MEM_KEEP(init.text*) \ 587 MEM_KEEP(exit.text*) \ 588 589 590 /* sched.text is aling to function alignment to secure we have same 591 * address even at second ld pass when generating System.map */ 592 #define SCHED_TEXT \ 593 ALIGN_FUNCTION(); \ 594 __sched_text_start = .; \ 595 *(.sched.text) \ 596 __sched_text_end = .; 597 598 /* spinlock.text is aling to function alignment to secure we have same 599 * address even at second ld pass when generating System.map */ 600 #define LOCK_TEXT \ 601 ALIGN_FUNCTION(); \ 602 __lock_text_start = .; \ 603 *(.spinlock.text) \ 604 __lock_text_end = .; 605 606 #define CPUIDLE_TEXT \ 607 ALIGN_FUNCTION(); \ 608 __cpuidle_text_start = .; \ 609 *(.cpuidle.text) \ 610 __cpuidle_text_end = .; 611 612 #define KPROBES_TEXT \ 613 ALIGN_FUNCTION(); \ 614 __kprobes_text_start = .; \ 615 *(.kprobes.text) \ 616 __kprobes_text_end = .; 617 618 #define ENTRY_TEXT \ 619 ALIGN_FUNCTION(); \ 620 __entry_text_start = .; \ 621 *(.entry.text) \ 622 __entry_text_end = .; 623 624 #define IRQENTRY_TEXT \ 625 ALIGN_FUNCTION(); \ 626 __irqentry_text_start = .; \ 627 *(.irqentry.text) \ 628 __irqentry_text_end = .; 629 630 #define SOFTIRQENTRY_TEXT \ 631 ALIGN_FUNCTION(); \ 632 __softirqentry_text_start = .; \ 633 *(.softirqentry.text) \ 634 __softirqentry_text_end = .; 635 636 #define STATIC_CALL_TEXT \ 637 ALIGN_FUNCTION(); \ 638 __static_call_text_start = .; \ 639 *(.static_call.text) \ 640 __static_call_text_end = .; 641 642 /* Section used for early init (in .S files) */ 643 #define HEAD_TEXT KEEP(*(.head.text)) 644 645 #define HEAD_TEXT_SECTION \ 646 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 647 HEAD_TEXT \ 648 } 649 650 /* 651 * Exception table 652 */ 653 #define EXCEPTION_TABLE(align) \ 654 . = ALIGN(align); \ 655 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 656 __start___ex_table = .; \ 657 KEEP(*(__ex_table)) \ 658 __stop___ex_table = .; \ 659 } 660 661 /* 662 * .BTF 663 */ 664 #ifdef CONFIG_DEBUG_INFO_BTF 665 #define BTF \ 666 .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \ 667 __start_BTF = .; \ 668 KEEP(*(.BTF)) \ 669 __stop_BTF = .; \ 670 } \ 671 . = ALIGN(4); \ 672 .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) { \ 673 *(.BTF_ids) \ 674 } 675 #else 676 #define BTF 677 #endif 678 679 /* 680 * Init task 681 */ 682 #define INIT_TASK_DATA_SECTION(align) \ 683 . = ALIGN(align); \ 684 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 685 INIT_TASK_DATA(align) \ 686 } 687 688 #ifdef CONFIG_CONSTRUCTORS 689 #define KERNEL_CTORS() . = ALIGN(8); \ 690 __ctors_start = .; \ 691 KEEP(*(SORT(.ctors.*))) \ 692 KEEP(*(.ctors)) \ 693 KEEP(*(SORT(.init_array.*))) \ 694 KEEP(*(.init_array)) \ 695 __ctors_end = .; 696 #else 697 #define KERNEL_CTORS() 698 #endif 699 700 /* init and exit section handling */ 701 #define INIT_DATA \ 702 KEEP(*(SORT(___kentry+*))) \ 703 *(.init.data init.data.*) \ 704 MEM_DISCARD(init.data*) \ 705 KERNEL_CTORS() \ 706 MCOUNT_REC() \ 707 *(.init.rodata .init.rodata.*) \ 708 FTRACE_EVENTS() \ 709 TRACE_SYSCALLS() \ 710 KPROBE_BLACKLIST() \ 711 ERROR_INJECT_WHITELIST() \ 712 MEM_DISCARD(init.rodata) \ 713 CLK_OF_TABLES() \ 714 RESERVEDMEM_OF_TABLES() \ 715 TIMER_OF_TABLES() \ 716 CPU_METHOD_OF_TABLES() \ 717 CPUIDLE_METHOD_OF_TABLES() \ 718 KERNEL_DTB() \ 719 IRQCHIP_OF_MATCH_TABLE() \ 720 ACPI_PROBE_TABLE(irqchip) \ 721 ACPI_PROBE_TABLE(timer) \ 722 THERMAL_TABLE(governor) \ 723 EARLYCON_TABLE() \ 724 LSM_TABLE() \ 725 EARLY_LSM_TABLE() \ 726 KUNIT_TABLE() 727 728 #define INIT_TEXT \ 729 *(.init.text .init.text.*) \ 730 *(.text.startup) \ 731 MEM_DISCARD(init.text*) 732 733 #define EXIT_DATA \ 734 *(.exit.data .exit.data.*) \ 735 *(.fini_array .fini_array.*) \ 736 *(.dtors .dtors.*) \ 737 MEM_DISCARD(exit.data*) \ 738 MEM_DISCARD(exit.rodata*) 739 740 #define EXIT_TEXT \ 741 *(.exit.text) \ 742 *(.text.exit) \ 743 MEM_DISCARD(exit.text) 744 745 #define EXIT_CALL \ 746 *(.exitcall.exit) 747 748 /* 749 * bss (Block Started by Symbol) - uninitialized data 750 * zeroed during startup 751 */ 752 #define SBSS(sbss_align) \ 753 . = ALIGN(sbss_align); \ 754 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 755 *(.dynsbss) \ 756 *(SBSS_MAIN) \ 757 *(.scommon) \ 758 } 759 760 /* 761 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 762 * sections to the front of bss. 763 */ 764 #ifndef BSS_FIRST_SECTIONS 765 #define BSS_FIRST_SECTIONS 766 #endif 767 768 #define BSS(bss_align) \ 769 . = ALIGN(bss_align); \ 770 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 771 BSS_FIRST_SECTIONS \ 772 . = ALIGN(PAGE_SIZE); \ 773 *(.bss..page_aligned) \ 774 . = ALIGN(PAGE_SIZE); \ 775 *(.dynbss) \ 776 *(BSS_MAIN) \ 777 *(COMMON) \ 778 } 779 780 /* 781 * DWARF debug sections. 782 * Symbols in the DWARF debugging sections are relative to 783 * the beginning of the section so we begin them at 0. 784 */ 785 #define DWARF_DEBUG \ 786 /* DWARF 1 */ \ 787 .debug 0 : { *(.debug) } \ 788 .line 0 : { *(.line) } \ 789 /* GNU DWARF 1 extensions */ \ 790 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 791 .debug_sfnames 0 : { *(.debug_sfnames) } \ 792 /* DWARF 1.1 and DWARF 2 */ \ 793 .debug_aranges 0 : { *(.debug_aranges) } \ 794 .debug_pubnames 0 : { *(.debug_pubnames) } \ 795 /* DWARF 2 */ \ 796 .debug_info 0 : { *(.debug_info \ 797 .gnu.linkonce.wi.*) } \ 798 .debug_abbrev 0 : { *(.debug_abbrev) } \ 799 .debug_line 0 : { *(.debug_line) } \ 800 .debug_frame 0 : { *(.debug_frame) } \ 801 .debug_str 0 : { *(.debug_str) } \ 802 .debug_loc 0 : { *(.debug_loc) } \ 803 .debug_macinfo 0 : { *(.debug_macinfo) } \ 804 .debug_pubtypes 0 : { *(.debug_pubtypes) } \ 805 /* DWARF 3 */ \ 806 .debug_ranges 0 : { *(.debug_ranges) } \ 807 /* SGI/MIPS DWARF 2 extensions */ \ 808 .debug_weaknames 0 : { *(.debug_weaknames) } \ 809 .debug_funcnames 0 : { *(.debug_funcnames) } \ 810 .debug_typenames 0 : { *(.debug_typenames) } \ 811 .debug_varnames 0 : { *(.debug_varnames) } \ 812 /* GNU DWARF 2 extensions */ \ 813 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \ 814 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \ 815 /* DWARF 4 */ \ 816 .debug_types 0 : { *(.debug_types) } \ 817 /* DWARF 5 */ \ 818 .debug_addr 0 : { *(.debug_addr) } \ 819 .debug_line_str 0 : { *(.debug_line_str) } \ 820 .debug_loclists 0 : { *(.debug_loclists) } \ 821 .debug_macro 0 : { *(.debug_macro) } \ 822 .debug_names 0 : { *(.debug_names) } \ 823 .debug_rnglists 0 : { *(.debug_rnglists) } \ 824 .debug_str_offsets 0 : { *(.debug_str_offsets) } 825 826 /* Stabs debugging sections. */ 827 #define STABS_DEBUG \ 828 .stab 0 : { *(.stab) } \ 829 .stabstr 0 : { *(.stabstr) } \ 830 .stab.excl 0 : { *(.stab.excl) } \ 831 .stab.exclstr 0 : { *(.stab.exclstr) } \ 832 .stab.index 0 : { *(.stab.index) } \ 833 .stab.indexstr 0 : { *(.stab.indexstr) } 834 835 /* Required sections not related to debugging. */ 836 #define ELF_DETAILS \ 837 .comment 0 : { *(.comment) } \ 838 .symtab 0 : { *(.symtab) } \ 839 .strtab 0 : { *(.strtab) } \ 840 .shstrtab 0 : { *(.shstrtab) } 841 842 #ifdef CONFIG_GENERIC_BUG 843 #define BUG_TABLE \ 844 . = ALIGN(8); \ 845 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 846 __start___bug_table = .; \ 847 KEEP(*(__bug_table)) \ 848 __stop___bug_table = .; \ 849 } 850 #else 851 #define BUG_TABLE 852 #endif 853 854 #ifdef CONFIG_UNWINDER_ORC 855 #define ORC_UNWIND_TABLE \ 856 . = ALIGN(4); \ 857 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \ 858 __start_orc_unwind_ip = .; \ 859 KEEP(*(.orc_unwind_ip)) \ 860 __stop_orc_unwind_ip = .; \ 861 } \ 862 . = ALIGN(2); \ 863 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \ 864 __start_orc_unwind = .; \ 865 KEEP(*(.orc_unwind)) \ 866 __stop_orc_unwind = .; \ 867 } \ 868 text_size = _etext - _stext; \ 869 . = ALIGN(4); \ 870 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \ 871 orc_lookup = .; \ 872 . += (((text_size + LOOKUP_BLOCK_SIZE - 1) / \ 873 LOOKUP_BLOCK_SIZE) + 1) * 4; \ 874 orc_lookup_end = .; \ 875 } 876 #else 877 #define ORC_UNWIND_TABLE 878 #endif 879 880 /* Built-in firmware blobs */ 881 #ifdef CONFIG_FW_LOADER 882 #define FW_LOADER_BUILT_IN_DATA \ 883 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) { \ 884 __start_builtin_fw = .; \ 885 KEEP(*(.builtin_fw)) \ 886 __end_builtin_fw = .; \ 887 } 888 #else 889 #define FW_LOADER_BUILT_IN_DATA 890 #endif 891 892 #ifdef CONFIG_PM_TRACE 893 #define TRACEDATA \ 894 . = ALIGN(4); \ 895 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 896 __tracedata_start = .; \ 897 KEEP(*(.tracedata)) \ 898 __tracedata_end = .; \ 899 } 900 #else 901 #define TRACEDATA 902 #endif 903 904 #ifdef CONFIG_PRINTK_INDEX 905 #define PRINTK_INDEX \ 906 .printk_index : AT(ADDR(.printk_index) - LOAD_OFFSET) { \ 907 __start_printk_index = .; \ 908 *(.printk_index) \ 909 __stop_printk_index = .; \ 910 } 911 #else 912 #define PRINTK_INDEX 913 #endif 914 915 #define NOTES \ 916 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 917 __start_notes = .; \ 918 KEEP(*(.note.*)) \ 919 __stop_notes = .; \ 920 } NOTES_HEADERS \ 921 NOTES_HEADERS_RESTORE 922 923 #define INIT_SETUP(initsetup_align) \ 924 . = ALIGN(initsetup_align); \ 925 __setup_start = .; \ 926 KEEP(*(.init.setup)) \ 927 __setup_end = .; 928 929 #define INIT_CALLS_LEVEL(level) \ 930 __initcall##level##_start = .; \ 931 KEEP(*(.initcall##level##.init)) \ 932 KEEP(*(.initcall##level##s.init)) \ 933 934 #define INIT_CALLS \ 935 __initcall_start = .; \ 936 KEEP(*(.initcallearly.init)) \ 937 INIT_CALLS_LEVEL(0) \ 938 INIT_CALLS_LEVEL(1) \ 939 INIT_CALLS_LEVEL(2) \ 940 INIT_CALLS_LEVEL(3) \ 941 INIT_CALLS_LEVEL(4) \ 942 INIT_CALLS_LEVEL(5) \ 943 INIT_CALLS_LEVEL(rootfs) \ 944 INIT_CALLS_LEVEL(6) \ 945 INIT_CALLS_LEVEL(7) \ 946 __initcall_end = .; 947 948 #define CON_INITCALL \ 949 __con_initcall_start = .; \ 950 KEEP(*(.con_initcall.init)) \ 951 __con_initcall_end = .; 952 953 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */ 954 #define KUNIT_TABLE() \ 955 . = ALIGN(8); \ 956 __kunit_suites_start = .; \ 957 KEEP(*(.kunit_test_suites)) \ 958 __kunit_suites_end = .; 959 960 #ifdef CONFIG_BLK_DEV_INITRD 961 #define INIT_RAM_FS \ 962 . = ALIGN(4); \ 963 __initramfs_start = .; \ 964 KEEP(*(.init.ramfs)) \ 965 . = ALIGN(8); \ 966 KEEP(*(.init.ramfs.info)) 967 #else 968 #define INIT_RAM_FS 969 #endif 970 971 /* 972 * Memory encryption operates on a page basis. Since we need to clear 973 * the memory encryption mask for this section, it needs to be aligned 974 * on a page boundary and be a page-size multiple in length. 975 * 976 * Note: We use a separate section so that only this section gets 977 * decrypted to avoid exposing more than we wish. 978 */ 979 #ifdef CONFIG_AMD_MEM_ENCRYPT 980 #define PERCPU_DECRYPTED_SECTION \ 981 . = ALIGN(PAGE_SIZE); \ 982 *(.data..decrypted) \ 983 *(.data..percpu..decrypted) \ 984 . = ALIGN(PAGE_SIZE); 985 #else 986 #define PERCPU_DECRYPTED_SECTION 987 #endif 988 989 990 /* 991 * Default discarded sections. 992 * 993 * Some archs want to discard exit text/data at runtime rather than 994 * link time due to cross-section references such as alt instructions, 995 * bug table, eh_frame, etc. DISCARDS must be the last of output 996 * section definitions so that such archs put those in earlier section 997 * definitions. 998 */ 999 #ifdef RUNTIME_DISCARD_EXIT 1000 #define EXIT_DISCARDS 1001 #else 1002 #define EXIT_DISCARDS \ 1003 EXIT_TEXT \ 1004 EXIT_DATA 1005 #endif 1006 1007 /* 1008 * Clang's -fprofile-arcs, -fsanitize=kernel-address, and 1009 * -fsanitize=thread produce unwanted sections (.eh_frame 1010 * and .init_array.*), but CONFIG_CONSTRUCTORS wants to 1011 * keep any .init_array.* sections. 1012 * https://bugs.llvm.org/show_bug.cgi?id=46478 1013 */ 1014 #if defined(CONFIG_GCOV_KERNEL) || defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN) || \ 1015 defined(CONFIG_CFI_CLANG) 1016 # ifdef CONFIG_CONSTRUCTORS 1017 # define SANITIZER_DISCARDS \ 1018 *(.eh_frame) 1019 # else 1020 # define SANITIZER_DISCARDS \ 1021 *(.init_array) *(.init_array.*) \ 1022 *(.eh_frame) 1023 # endif 1024 #else 1025 # define SANITIZER_DISCARDS 1026 #endif 1027 1028 #define COMMON_DISCARDS \ 1029 SANITIZER_DISCARDS \ 1030 *(.discard) \ 1031 *(.discard.*) \ 1032 *(.modinfo) \ 1033 /* ld.bfd warns about .gnu.version* even when not emitted */ \ 1034 *(.gnu.version*) \ 1035 1036 #define DISCARDS \ 1037 /DISCARD/ : { \ 1038 EXIT_DISCARDS \ 1039 EXIT_CALL \ 1040 COMMON_DISCARDS \ 1041 } 1042 1043 /** 1044 * PERCPU_INPUT - the percpu input sections 1045 * @cacheline: cacheline size 1046 * 1047 * The core percpu section names and core symbols which do not rely 1048 * directly upon load addresses. 1049 * 1050 * @cacheline is used to align subsections to avoid false cacheline 1051 * sharing between subsections for different purposes. 1052 */ 1053 #define PERCPU_INPUT(cacheline) \ 1054 __per_cpu_start = .; \ 1055 *(.data..percpu..first) \ 1056 . = ALIGN(PAGE_SIZE); \ 1057 *(.data..percpu..page_aligned) \ 1058 . = ALIGN(cacheline); \ 1059 *(.data..percpu..read_mostly) \ 1060 . = ALIGN(cacheline); \ 1061 *(.data..percpu) \ 1062 *(.data..percpu..shared_aligned) \ 1063 PERCPU_DECRYPTED_SECTION \ 1064 __per_cpu_end = .; 1065 1066 /** 1067 * PERCPU_VADDR - define output section for percpu area 1068 * @cacheline: cacheline size 1069 * @vaddr: explicit base address (optional) 1070 * @phdr: destination PHDR (optional) 1071 * 1072 * Macro which expands to output section for percpu area. 1073 * 1074 * @cacheline is used to align subsections to avoid false cacheline 1075 * sharing between subsections for different purposes. 1076 * 1077 * If @vaddr is not blank, it specifies explicit base address and all 1078 * percpu symbols will be offset from the given address. If blank, 1079 * @vaddr always equals @laddr + LOAD_OFFSET. 1080 * 1081 * @phdr defines the output PHDR to use if not blank. Be warned that 1082 * output PHDR is sticky. If @phdr is specified, the next output 1083 * section in the linker script will go there too. @phdr should have 1084 * a leading colon. 1085 * 1086 * Note that this macros defines __per_cpu_load as an absolute symbol. 1087 * If there is no need to put the percpu section at a predetermined 1088 * address, use PERCPU_SECTION. 1089 */ 1090 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 1091 __per_cpu_load = .; \ 1092 .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \ 1093 PERCPU_INPUT(cacheline) \ 1094 } phdr \ 1095 . = __per_cpu_load + SIZEOF(.data..percpu); 1096 1097 /** 1098 * PERCPU_SECTION - define output section for percpu area, simple version 1099 * @cacheline: cacheline size 1100 * 1101 * Align to PAGE_SIZE and outputs output section for percpu area. This 1102 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 1103 * __per_cpu_start will be identical. 1104 * 1105 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 1106 * except that __per_cpu_load is defined as a relative symbol against 1107 * .data..percpu which is required for relocatable x86_32 configuration. 1108 */ 1109 #define PERCPU_SECTION(cacheline) \ 1110 . = ALIGN(PAGE_SIZE); \ 1111 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 1112 __per_cpu_load = .; \ 1113 PERCPU_INPUT(cacheline) \ 1114 } 1115 1116 1117 /* 1118 * Definition of the high level *_SECTION macros 1119 * They will fit only a subset of the architectures 1120 */ 1121 1122 1123 /* 1124 * Writeable data. 1125 * All sections are combined in a single .data section. 1126 * The sections following CONSTRUCTORS are arranged so their 1127 * typical alignment matches. 1128 * A cacheline is typical/always less than a PAGE_SIZE so 1129 * the sections that has this restriction (or similar) 1130 * is located before the ones requiring PAGE_SIZE alignment. 1131 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 1132 * matches the requirement of PAGE_ALIGNED_DATA. 1133 * 1134 * use 0 as page_align if page_aligned data is not used */ 1135 #define RW_DATA(cacheline, pagealigned, inittask) \ 1136 . = ALIGN(PAGE_SIZE); \ 1137 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 1138 INIT_TASK_DATA(inittask) \ 1139 NOSAVE_DATA \ 1140 PAGE_ALIGNED_DATA(pagealigned) \ 1141 CACHELINE_ALIGNED_DATA(cacheline) \ 1142 READ_MOSTLY_DATA(cacheline) \ 1143 DATA_DATA \ 1144 CONSTRUCTORS \ 1145 } \ 1146 BUG_TABLE \ 1147 1148 #define INIT_TEXT_SECTION(inittext_align) \ 1149 . = ALIGN(inittext_align); \ 1150 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 1151 _sinittext = .; \ 1152 INIT_TEXT \ 1153 _einittext = .; \ 1154 } 1155 1156 #define INIT_DATA_SECTION(initsetup_align) \ 1157 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 1158 INIT_DATA \ 1159 INIT_SETUP(initsetup_align) \ 1160 INIT_CALLS \ 1161 CON_INITCALL \ 1162 INIT_RAM_FS \ 1163 } 1164 1165 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 1166 . = ALIGN(sbss_align); \ 1167 __bss_start = .; \ 1168 SBSS(sbss_align) \ 1169 BSS(bss_align) \ 1170 . = ALIGN(stop_align); \ 1171 __bss_stop = .; 1172