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 #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 #ifdef CONFIG_TRACE_BRANCH_PROFILING 203 #define LIKELY_PROFILE() __start_annotated_branch_profile = .; \ 204 KEEP(*(_ftrace_annotated_branch)) \ 205 __stop_annotated_branch_profile = .; 206 #else 207 #define LIKELY_PROFILE() 208 #endif 209 210 #ifdef CONFIG_PROFILE_ALL_BRANCHES 211 #define BRANCH_PROFILE() __start_branch_profile = .; \ 212 KEEP(*(_ftrace_branch)) \ 213 __stop_branch_profile = .; 214 #else 215 #define BRANCH_PROFILE() 216 #endif 217 218 #ifdef CONFIG_KPROBES 219 #define KPROBE_BLACKLIST() . = ALIGN(8); \ 220 __start_kprobe_blacklist = .; \ 221 KEEP(*(_kprobe_blacklist)) \ 222 __stop_kprobe_blacklist = .; 223 #else 224 #define KPROBE_BLACKLIST() 225 #endif 226 227 #ifdef CONFIG_FUNCTION_ERROR_INJECTION 228 #define ERROR_INJECT_WHITELIST() STRUCT_ALIGN(); \ 229 __start_error_injection_whitelist = .; \ 230 KEEP(*(_error_injection_whitelist)) \ 231 __stop_error_injection_whitelist = .; 232 #else 233 #define ERROR_INJECT_WHITELIST() 234 #endif 235 236 #ifdef CONFIG_EVENT_TRACING 237 #define FTRACE_EVENTS() . = ALIGN(8); \ 238 __start_ftrace_events = .; \ 239 KEEP(*(_ftrace_events)) \ 240 __stop_ftrace_events = .; \ 241 __start_ftrace_eval_maps = .; \ 242 KEEP(*(_ftrace_eval_map)) \ 243 __stop_ftrace_eval_maps = .; 244 #else 245 #define FTRACE_EVENTS() 246 #endif 247 248 #ifdef CONFIG_TRACING 249 #define TRACE_PRINTKS() __start___trace_bprintk_fmt = .; \ 250 KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \ 251 __stop___trace_bprintk_fmt = .; 252 #define TRACEPOINT_STR() __start___tracepoint_str = .; \ 253 KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \ 254 __stop___tracepoint_str = .; 255 #else 256 #define TRACE_PRINTKS() 257 #define TRACEPOINT_STR() 258 #endif 259 260 #ifdef CONFIG_FTRACE_SYSCALLS 261 #define TRACE_SYSCALLS() . = ALIGN(8); \ 262 __start_syscalls_metadata = .; \ 263 KEEP(*(__syscalls_metadata)) \ 264 __stop_syscalls_metadata = .; 265 #else 266 #define TRACE_SYSCALLS() 267 #endif 268 269 #ifdef CONFIG_BPF_EVENTS 270 #define BPF_RAW_TP() STRUCT_ALIGN(); \ 271 __start__bpf_raw_tp = .; \ 272 KEEP(*(__bpf_raw_tp_map)) \ 273 __stop__bpf_raw_tp = .; 274 #else 275 #define BPF_RAW_TP() 276 #endif 277 278 #ifdef CONFIG_SERIAL_EARLYCON 279 #define EARLYCON_TABLE() . = ALIGN(8); \ 280 __earlycon_table = .; \ 281 KEEP(*(__earlycon_table)) \ 282 __earlycon_table_end = .; 283 #else 284 #define EARLYCON_TABLE() 285 #endif 286 287 #ifdef CONFIG_SECURITY 288 #define LSM_TABLE() . = ALIGN(8); \ 289 __start_lsm_info = .; \ 290 KEEP(*(.lsm_info.init)) \ 291 __end_lsm_info = .; 292 #define EARLY_LSM_TABLE() . = ALIGN(8); \ 293 __start_early_lsm_info = .; \ 294 KEEP(*(.early_lsm_info.init)) \ 295 __end_early_lsm_info = .; 296 #else 297 #define LSM_TABLE() 298 #define EARLY_LSM_TABLE() 299 #endif 300 301 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name) 302 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name) 303 #define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name) 304 #define _OF_TABLE_0(name) 305 #define _OF_TABLE_1(name) \ 306 . = ALIGN(8); \ 307 __##name##_of_table = .; \ 308 KEEP(*(__##name##_of_table)) \ 309 KEEP(*(__##name##_of_table_end)) 310 311 #define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer) 312 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip) 313 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk) 314 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem) 315 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method) 316 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method) 317 318 #ifdef CONFIG_ACPI 319 #define ACPI_PROBE_TABLE(name) \ 320 . = ALIGN(8); \ 321 __##name##_acpi_probe_table = .; \ 322 KEEP(*(__##name##_acpi_probe_table)) \ 323 __##name##_acpi_probe_table_end = .; 324 #else 325 #define ACPI_PROBE_TABLE(name) 326 #endif 327 328 #ifdef CONFIG_THERMAL 329 #define THERMAL_TABLE(name) \ 330 . = ALIGN(8); \ 331 __##name##_thermal_table = .; \ 332 KEEP(*(__##name##_thermal_table)) \ 333 __##name##_thermal_table_end = .; 334 #else 335 #define THERMAL_TABLE(name) 336 #endif 337 338 #define KERNEL_DTB() \ 339 STRUCT_ALIGN(); \ 340 __dtb_start = .; \ 341 KEEP(*(.dtb.init.rodata)) \ 342 __dtb_end = .; 343 344 /* 345 * .data section 346 */ 347 #define DATA_DATA \ 348 *(.xiptext) \ 349 *(DATA_MAIN) \ 350 *(.data..decrypted) \ 351 *(.ref.data) \ 352 *(.data..shared_aligned) /* percpu related */ \ 353 MEM_KEEP(init.data*) \ 354 MEM_KEEP(exit.data*) \ 355 *(.data.unlikely) \ 356 __start_once = .; \ 357 *(.data.once) \ 358 __end_once = .; \ 359 STRUCT_ALIGN(); \ 360 *(__tracepoints) \ 361 /* implement dynamic printk debug */ \ 362 . = ALIGN(8); \ 363 __start___dyndbg_classes = .; \ 364 KEEP(*(__dyndbg_classes)) \ 365 __stop___dyndbg_classes = .; \ 366 __start___dyndbg = .; \ 367 KEEP(*(__dyndbg)) \ 368 __stop___dyndbg = .; \ 369 LIKELY_PROFILE() \ 370 BRANCH_PROFILE() \ 371 TRACE_PRINTKS() \ 372 BPF_RAW_TP() \ 373 TRACEPOINT_STR() 374 375 /* 376 * Data section helpers 377 */ 378 #define NOSAVE_DATA \ 379 . = ALIGN(PAGE_SIZE); \ 380 __nosave_begin = .; \ 381 *(.data..nosave) \ 382 . = ALIGN(PAGE_SIZE); \ 383 __nosave_end = .; 384 385 #define PAGE_ALIGNED_DATA(page_align) \ 386 . = ALIGN(page_align); \ 387 *(.data..page_aligned) \ 388 . = ALIGN(page_align); 389 390 #define READ_MOSTLY_DATA(align) \ 391 . = ALIGN(align); \ 392 *(.data..read_mostly) \ 393 . = ALIGN(align); 394 395 #define CACHELINE_ALIGNED_DATA(align) \ 396 . = ALIGN(align); \ 397 *(.data..cacheline_aligned) 398 399 #define INIT_TASK_DATA(align) \ 400 . = ALIGN(align); \ 401 __start_init_task = .; \ 402 init_thread_union = .; \ 403 init_stack = .; \ 404 KEEP(*(.data..init_task)) \ 405 KEEP(*(.data..init_thread_info)) \ 406 . = __start_init_task + THREAD_SIZE; \ 407 __end_init_task = .; 408 409 #define JUMP_TABLE_DATA \ 410 . = ALIGN(8); \ 411 __start___jump_table = .; \ 412 KEEP(*(__jump_table)) \ 413 __stop___jump_table = .; 414 415 #ifdef CONFIG_HAVE_STATIC_CALL_INLINE 416 #define STATIC_CALL_DATA \ 417 . = ALIGN(8); \ 418 __start_static_call_sites = .; \ 419 KEEP(*(.static_call_sites)) \ 420 __stop_static_call_sites = .; \ 421 __start_static_call_tramp_key = .; \ 422 KEEP(*(.static_call_tramp_key)) \ 423 __stop_static_call_tramp_key = .; 424 #else 425 #define STATIC_CALL_DATA 426 #endif 427 428 /* 429 * Allow architectures to handle ro_after_init data on their 430 * own by defining an empty RO_AFTER_INIT_DATA. 431 */ 432 #ifndef RO_AFTER_INIT_DATA 433 #define RO_AFTER_INIT_DATA \ 434 . = ALIGN(8); \ 435 __start_ro_after_init = .; \ 436 *(.data..ro_after_init) \ 437 JUMP_TABLE_DATA \ 438 STATIC_CALL_DATA \ 439 __end_ro_after_init = .; 440 #endif 441 442 /* 443 * .kcfi_traps contains a list KCFI trap locations. 444 */ 445 #ifndef KCFI_TRAPS 446 #ifdef CONFIG_ARCH_USES_CFI_TRAPS 447 #define KCFI_TRAPS \ 448 __kcfi_traps : AT(ADDR(__kcfi_traps) - LOAD_OFFSET) { \ 449 __start___kcfi_traps = .; \ 450 KEEP(*(.kcfi_traps)) \ 451 __stop___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 __start___tracepoints_ptrs = .; \ 470 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \ 471 __stop___tracepoints_ptrs = .; \ 472 *(__tracepoints_strings)/* Tracepoints: strings */ \ 473 } \ 474 \ 475 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 476 *(.rodata1) \ 477 } \ 478 \ 479 /* PCI quirks */ \ 480 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 481 __start_pci_fixups_early = .; \ 482 KEEP(*(.pci_fixup_early)) \ 483 __end_pci_fixups_early = .; \ 484 __start_pci_fixups_header = .; \ 485 KEEP(*(.pci_fixup_header)) \ 486 __end_pci_fixups_header = .; \ 487 __start_pci_fixups_final = .; \ 488 KEEP(*(.pci_fixup_final)) \ 489 __end_pci_fixups_final = .; \ 490 __start_pci_fixups_enable = .; \ 491 KEEP(*(.pci_fixup_enable)) \ 492 __end_pci_fixups_enable = .; \ 493 __start_pci_fixups_resume = .; \ 494 KEEP(*(.pci_fixup_resume)) \ 495 __end_pci_fixups_resume = .; \ 496 __start_pci_fixups_resume_early = .; \ 497 KEEP(*(.pci_fixup_resume_early)) \ 498 __end_pci_fixups_resume_early = .; \ 499 __start_pci_fixups_suspend = .; \ 500 KEEP(*(.pci_fixup_suspend)) \ 501 __end_pci_fixups_suspend = .; \ 502 __start_pci_fixups_suspend_late = .; \ 503 KEEP(*(.pci_fixup_suspend_late)) \ 504 __end_pci_fixups_suspend_late = .; \ 505 } \ 506 \ 507 FW_LOADER_BUILT_IN_DATA \ 508 TRACEDATA \ 509 \ 510 PRINTK_INDEX \ 511 \ 512 /* Kernel symbol table: Normal symbols */ \ 513 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 514 __start___ksymtab = .; \ 515 KEEP(*(SORT(___ksymtab+*))) \ 516 __stop___ksymtab = .; \ 517 } \ 518 \ 519 /* Kernel symbol table: GPL-only symbols */ \ 520 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 521 __start___ksymtab_gpl = .; \ 522 KEEP(*(SORT(___ksymtab_gpl+*))) \ 523 __stop___ksymtab_gpl = .; \ 524 } \ 525 \ 526 /* Kernel symbol table: Normal symbols */ \ 527 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 528 __start___kcrctab = .; \ 529 KEEP(*(SORT(___kcrctab+*))) \ 530 __stop___kcrctab = .; \ 531 } \ 532 \ 533 /* Kernel symbol table: GPL-only symbols */ \ 534 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 535 __start___kcrctab_gpl = .; \ 536 KEEP(*(SORT(___kcrctab_gpl+*))) \ 537 __stop___kcrctab_gpl = .; \ 538 } \ 539 \ 540 /* Kernel symbol table: strings */ \ 541 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 542 *(__ksymtab_strings) \ 543 } \ 544 \ 545 /* __*init sections */ \ 546 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 547 *(.ref.rodata) \ 548 MEM_KEEP(init.rodata) \ 549 MEM_KEEP(exit.rodata) \ 550 } \ 551 \ 552 /* Built-in module parameters. */ \ 553 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 554 __start___param = .; \ 555 KEEP(*(__param)) \ 556 __stop___param = .; \ 557 } \ 558 \ 559 /* Built-in module versions. */ \ 560 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 561 __start___modver = .; \ 562 KEEP(*(__modver)) \ 563 __stop___modver = .; \ 564 } \ 565 \ 566 KCFI_TRAPS \ 567 \ 568 RO_EXCEPTION_TABLE \ 569 NOTES \ 570 BTF \ 571 \ 572 . = ALIGN((align)); \ 573 __end_rodata = .; 574 575 576 /* 577 * Non-instrumentable text section 578 */ 579 #define NOINSTR_TEXT \ 580 ALIGN_FUNCTION(); \ 581 __noinstr_text_start = .; \ 582 *(.noinstr.text) \ 583 __noinstr_text_end = .; 584 585 /* 586 * .text section. Map to function alignment to avoid address changes 587 * during second ld run in second ld pass when generating System.map 588 * 589 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead 590 * code elimination is enabled, so these sections should be converted 591 * to use ".." first. 592 */ 593 #define TEXT_TEXT \ 594 ALIGN_FUNCTION(); \ 595 *(.text.hot .text.hot.*) \ 596 *(TEXT_MAIN .text.fixup) \ 597 *(.text.unlikely .text.unlikely.*) \ 598 *(.text.unknown .text.unknown.*) \ 599 NOINSTR_TEXT \ 600 *(.text..refcount) \ 601 *(.ref.text) \ 602 *(.text.asan.* .text.tsan.*) \ 603 MEM_KEEP(init.text*) \ 604 MEM_KEEP(exit.text*) \ 605 606 607 /* sched.text is aling to function alignment to secure we have same 608 * address even at second ld pass when generating System.map */ 609 #define SCHED_TEXT \ 610 ALIGN_FUNCTION(); \ 611 __sched_text_start = .; \ 612 *(.sched.text) \ 613 __sched_text_end = .; 614 615 /* spinlock.text is aling to function alignment to secure we have same 616 * address even at second ld pass when generating System.map */ 617 #define LOCK_TEXT \ 618 ALIGN_FUNCTION(); \ 619 __lock_text_start = .; \ 620 *(.spinlock.text) \ 621 __lock_text_end = .; 622 623 #define CPUIDLE_TEXT \ 624 ALIGN_FUNCTION(); \ 625 __cpuidle_text_start = .; \ 626 *(.cpuidle.text) \ 627 __cpuidle_text_end = .; 628 629 #define KPROBES_TEXT \ 630 ALIGN_FUNCTION(); \ 631 __kprobes_text_start = .; \ 632 *(.kprobes.text) \ 633 __kprobes_text_end = .; 634 635 #define ENTRY_TEXT \ 636 ALIGN_FUNCTION(); \ 637 __entry_text_start = .; \ 638 *(.entry.text) \ 639 __entry_text_end = .; 640 641 #define IRQENTRY_TEXT \ 642 ALIGN_FUNCTION(); \ 643 __irqentry_text_start = .; \ 644 *(.irqentry.text) \ 645 __irqentry_text_end = .; 646 647 #define SOFTIRQENTRY_TEXT \ 648 ALIGN_FUNCTION(); \ 649 __softirqentry_text_start = .; \ 650 *(.softirqentry.text) \ 651 __softirqentry_text_end = .; 652 653 #define STATIC_CALL_TEXT \ 654 ALIGN_FUNCTION(); \ 655 __static_call_text_start = .; \ 656 *(.static_call.text) \ 657 __static_call_text_end = .; 658 659 /* Section used for early init (in .S files) */ 660 #define HEAD_TEXT KEEP(*(.head.text)) 661 662 #define HEAD_TEXT_SECTION \ 663 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 664 HEAD_TEXT \ 665 } 666 667 /* 668 * Exception table 669 */ 670 #define EXCEPTION_TABLE(align) \ 671 . = ALIGN(align); \ 672 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 673 __start___ex_table = .; \ 674 KEEP(*(__ex_table)) \ 675 __stop___ex_table = .; \ 676 } 677 678 /* 679 * .BTF 680 */ 681 #ifdef CONFIG_DEBUG_INFO_BTF 682 #define BTF \ 683 .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \ 684 __start_BTF = .; \ 685 KEEP(*(.BTF)) \ 686 __stop_BTF = .; \ 687 } \ 688 . = ALIGN(4); \ 689 .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) { \ 690 *(.BTF_ids) \ 691 } 692 #else 693 #define BTF 694 #endif 695 696 /* 697 * Init task 698 */ 699 #define INIT_TASK_DATA_SECTION(align) \ 700 . = ALIGN(align); \ 701 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 702 INIT_TASK_DATA(align) \ 703 } 704 705 #ifdef CONFIG_CONSTRUCTORS 706 #define KERNEL_CTORS() . = ALIGN(8); \ 707 __ctors_start = .; \ 708 KEEP(*(SORT(.ctors.*))) \ 709 KEEP(*(.ctors)) \ 710 KEEP(*(SORT(.init_array.*))) \ 711 KEEP(*(.init_array)) \ 712 __ctors_end = .; 713 #else 714 #define KERNEL_CTORS() 715 #endif 716 717 /* init and exit section handling */ 718 #define INIT_DATA \ 719 KEEP(*(SORT(___kentry+*))) \ 720 *(.init.data init.data.*) \ 721 MEM_DISCARD(init.data*) \ 722 KERNEL_CTORS() \ 723 MCOUNT_REC() \ 724 *(.init.rodata .init.rodata.*) \ 725 FTRACE_EVENTS() \ 726 TRACE_SYSCALLS() \ 727 KPROBE_BLACKLIST() \ 728 ERROR_INJECT_WHITELIST() \ 729 MEM_DISCARD(init.rodata) \ 730 CLK_OF_TABLES() \ 731 RESERVEDMEM_OF_TABLES() \ 732 TIMER_OF_TABLES() \ 733 CPU_METHOD_OF_TABLES() \ 734 CPUIDLE_METHOD_OF_TABLES() \ 735 KERNEL_DTB() \ 736 IRQCHIP_OF_MATCH_TABLE() \ 737 ACPI_PROBE_TABLE(irqchip) \ 738 ACPI_PROBE_TABLE(timer) \ 739 THERMAL_TABLE(governor) \ 740 EARLYCON_TABLE() \ 741 LSM_TABLE() \ 742 EARLY_LSM_TABLE() \ 743 KUNIT_TABLE() 744 745 #define INIT_TEXT \ 746 *(.init.text .init.text.*) \ 747 *(.text.startup) \ 748 MEM_DISCARD(init.text*) 749 750 #define EXIT_DATA \ 751 *(.exit.data .exit.data.*) \ 752 *(.fini_array .fini_array.*) \ 753 *(.dtors .dtors.*) \ 754 MEM_DISCARD(exit.data*) \ 755 MEM_DISCARD(exit.rodata*) 756 757 #define EXIT_TEXT \ 758 *(.exit.text) \ 759 *(.text.exit) \ 760 MEM_DISCARD(exit.text) 761 762 #define EXIT_CALL \ 763 *(.exitcall.exit) 764 765 /* 766 * bss (Block Started by Symbol) - uninitialized data 767 * zeroed during startup 768 */ 769 #define SBSS(sbss_align) \ 770 . = ALIGN(sbss_align); \ 771 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 772 *(.dynsbss) \ 773 *(SBSS_MAIN) \ 774 *(.scommon) \ 775 } 776 777 /* 778 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 779 * sections to the front of bss. 780 */ 781 #ifndef BSS_FIRST_SECTIONS 782 #define BSS_FIRST_SECTIONS 783 #endif 784 785 #define BSS(bss_align) \ 786 . = ALIGN(bss_align); \ 787 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 788 BSS_FIRST_SECTIONS \ 789 . = ALIGN(PAGE_SIZE); \ 790 *(.bss..page_aligned) \ 791 . = ALIGN(PAGE_SIZE); \ 792 *(.dynbss) \ 793 *(BSS_MAIN) \ 794 *(COMMON) \ 795 } 796 797 /* 798 * DWARF debug sections. 799 * Symbols in the DWARF debugging sections are relative to 800 * the beginning of the section so we begin them at 0. 801 */ 802 #define DWARF_DEBUG \ 803 /* DWARF 1 */ \ 804 .debug 0 : { *(.debug) } \ 805 .line 0 : { *(.line) } \ 806 /* GNU DWARF 1 extensions */ \ 807 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 808 .debug_sfnames 0 : { *(.debug_sfnames) } \ 809 /* DWARF 1.1 and DWARF 2 */ \ 810 .debug_aranges 0 : { *(.debug_aranges) } \ 811 .debug_pubnames 0 : { *(.debug_pubnames) } \ 812 /* DWARF 2 */ \ 813 .debug_info 0 : { *(.debug_info \ 814 .gnu.linkonce.wi.*) } \ 815 .debug_abbrev 0 : { *(.debug_abbrev) } \ 816 .debug_line 0 : { *(.debug_line) } \ 817 .debug_frame 0 : { *(.debug_frame) } \ 818 .debug_str 0 : { *(.debug_str) } \ 819 .debug_loc 0 : { *(.debug_loc) } \ 820 .debug_macinfo 0 : { *(.debug_macinfo) } \ 821 .debug_pubtypes 0 : { *(.debug_pubtypes) } \ 822 /* DWARF 3 */ \ 823 .debug_ranges 0 : { *(.debug_ranges) } \ 824 /* SGI/MIPS DWARF 2 extensions */ \ 825 .debug_weaknames 0 : { *(.debug_weaknames) } \ 826 .debug_funcnames 0 : { *(.debug_funcnames) } \ 827 .debug_typenames 0 : { *(.debug_typenames) } \ 828 .debug_varnames 0 : { *(.debug_varnames) } \ 829 /* GNU DWARF 2 extensions */ \ 830 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \ 831 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \ 832 /* DWARF 4 */ \ 833 .debug_types 0 : { *(.debug_types) } \ 834 /* DWARF 5 */ \ 835 .debug_addr 0 : { *(.debug_addr) } \ 836 .debug_line_str 0 : { *(.debug_line_str) } \ 837 .debug_loclists 0 : { *(.debug_loclists) } \ 838 .debug_macro 0 : { *(.debug_macro) } \ 839 .debug_names 0 : { *(.debug_names) } \ 840 .debug_rnglists 0 : { *(.debug_rnglists) } \ 841 .debug_str_offsets 0 : { *(.debug_str_offsets) } 842 843 /* Stabs debugging sections. */ 844 #define STABS_DEBUG \ 845 .stab 0 : { *(.stab) } \ 846 .stabstr 0 : { *(.stabstr) } \ 847 .stab.excl 0 : { *(.stab.excl) } \ 848 .stab.exclstr 0 : { *(.stab.exclstr) } \ 849 .stab.index 0 : { *(.stab.index) } \ 850 .stab.indexstr 0 : { *(.stab.indexstr) } 851 852 /* Required sections not related to debugging. */ 853 #define ELF_DETAILS \ 854 .comment 0 : { *(.comment) } \ 855 .symtab 0 : { *(.symtab) } \ 856 .strtab 0 : { *(.strtab) } \ 857 .shstrtab 0 : { *(.shstrtab) } 858 859 #ifdef CONFIG_GENERIC_BUG 860 #define BUG_TABLE \ 861 . = ALIGN(8); \ 862 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 863 __start___bug_table = .; \ 864 KEEP(*(__bug_table)) \ 865 __stop___bug_table = .; \ 866 } 867 #else 868 #define BUG_TABLE 869 #endif 870 871 #ifdef CONFIG_UNWINDER_ORC 872 #define ORC_UNWIND_TABLE \ 873 . = ALIGN(4); \ 874 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \ 875 __start_orc_unwind_ip = .; \ 876 KEEP(*(.orc_unwind_ip)) \ 877 __stop_orc_unwind_ip = .; \ 878 } \ 879 . = ALIGN(2); \ 880 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \ 881 __start_orc_unwind = .; \ 882 KEEP(*(.orc_unwind)) \ 883 __stop_orc_unwind = .; \ 884 } \ 885 text_size = _etext - _stext; \ 886 . = ALIGN(4); \ 887 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \ 888 orc_lookup = .; \ 889 . += (((text_size + LOOKUP_BLOCK_SIZE - 1) / \ 890 LOOKUP_BLOCK_SIZE) + 1) * 4; \ 891 orc_lookup_end = .; \ 892 } 893 #else 894 #define ORC_UNWIND_TABLE 895 #endif 896 897 /* Built-in firmware blobs */ 898 #ifdef CONFIG_FW_LOADER 899 #define FW_LOADER_BUILT_IN_DATA \ 900 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) { \ 901 __start_builtin_fw = .; \ 902 KEEP(*(.builtin_fw)) \ 903 __end_builtin_fw = .; \ 904 } 905 #else 906 #define FW_LOADER_BUILT_IN_DATA 907 #endif 908 909 #ifdef CONFIG_PM_TRACE 910 #define TRACEDATA \ 911 . = ALIGN(4); \ 912 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 913 __tracedata_start = .; \ 914 KEEP(*(.tracedata)) \ 915 __tracedata_end = .; \ 916 } 917 #else 918 #define TRACEDATA 919 #endif 920 921 #ifdef CONFIG_PRINTK_INDEX 922 #define PRINTK_INDEX \ 923 .printk_index : AT(ADDR(.printk_index) - LOAD_OFFSET) { \ 924 __start_printk_index = .; \ 925 *(.printk_index) \ 926 __stop_printk_index = .; \ 927 } 928 #else 929 #define PRINTK_INDEX 930 #endif 931 932 #define NOTES \ 933 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 934 __start_notes = .; \ 935 KEEP(*(.note.*)) \ 936 __stop_notes = .; \ 937 } NOTES_HEADERS \ 938 NOTES_HEADERS_RESTORE 939 940 #define INIT_SETUP(initsetup_align) \ 941 . = ALIGN(initsetup_align); \ 942 __setup_start = .; \ 943 KEEP(*(.init.setup)) \ 944 __setup_end = .; 945 946 #define INIT_CALLS_LEVEL(level) \ 947 __initcall##level##_start = .; \ 948 KEEP(*(.initcall##level##.init)) \ 949 KEEP(*(.initcall##level##s.init)) \ 950 951 #define INIT_CALLS \ 952 __initcall_start = .; \ 953 KEEP(*(.initcallearly.init)) \ 954 INIT_CALLS_LEVEL(0) \ 955 INIT_CALLS_LEVEL(1) \ 956 INIT_CALLS_LEVEL(2) \ 957 INIT_CALLS_LEVEL(3) \ 958 INIT_CALLS_LEVEL(4) \ 959 INIT_CALLS_LEVEL(5) \ 960 INIT_CALLS_LEVEL(rootfs) \ 961 INIT_CALLS_LEVEL(6) \ 962 INIT_CALLS_LEVEL(7) \ 963 __initcall_end = .; 964 965 #define CON_INITCALL \ 966 __con_initcall_start = .; \ 967 KEEP(*(.con_initcall.init)) \ 968 __con_initcall_end = .; 969 970 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */ 971 #define KUNIT_TABLE() \ 972 . = ALIGN(8); \ 973 __kunit_suites_start = .; \ 974 KEEP(*(.kunit_test_suites)) \ 975 __kunit_suites_end = .; 976 977 #ifdef CONFIG_BLK_DEV_INITRD 978 #define INIT_RAM_FS \ 979 . = ALIGN(4); \ 980 __initramfs_start = .; \ 981 KEEP(*(.init.ramfs)) \ 982 . = ALIGN(8); \ 983 KEEP(*(.init.ramfs.info)) 984 #else 985 #define INIT_RAM_FS 986 #endif 987 988 /* 989 * Memory encryption operates on a page basis. Since we need to clear 990 * the memory encryption mask for this section, it needs to be aligned 991 * on a page boundary and be a page-size multiple in length. 992 * 993 * Note: We use a separate section so that only this section gets 994 * decrypted to avoid exposing more than we wish. 995 */ 996 #ifdef CONFIG_AMD_MEM_ENCRYPT 997 #define PERCPU_DECRYPTED_SECTION \ 998 . = ALIGN(PAGE_SIZE); \ 999 *(.data..percpu..decrypted) \ 1000 . = ALIGN(PAGE_SIZE); 1001 #else 1002 #define PERCPU_DECRYPTED_SECTION 1003 #endif 1004 1005 1006 /* 1007 * Default discarded sections. 1008 * 1009 * Some archs want to discard exit text/data at runtime rather than 1010 * link time due to cross-section references such as alt instructions, 1011 * bug table, eh_frame, etc. DISCARDS must be the last of output 1012 * section definitions so that such archs put those in earlier section 1013 * definitions. 1014 */ 1015 #ifdef RUNTIME_DISCARD_EXIT 1016 #define EXIT_DISCARDS 1017 #else 1018 #define EXIT_DISCARDS \ 1019 EXIT_TEXT \ 1020 EXIT_DATA 1021 #endif 1022 1023 /* 1024 * Clang's -fprofile-arcs, -fsanitize=kernel-address, and 1025 * -fsanitize=thread produce unwanted sections (.eh_frame 1026 * and .init_array.*), but CONFIG_CONSTRUCTORS wants to 1027 * keep any .init_array.* sections. 1028 * https://bugs.llvm.org/show_bug.cgi?id=46478 1029 */ 1030 #if defined(CONFIG_GCOV_KERNEL) || defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN) 1031 # ifdef CONFIG_CONSTRUCTORS 1032 # define SANITIZER_DISCARDS \ 1033 *(.eh_frame) 1034 # else 1035 # define SANITIZER_DISCARDS \ 1036 *(.init_array) *(.init_array.*) \ 1037 *(.eh_frame) 1038 # endif 1039 #else 1040 # define SANITIZER_DISCARDS 1041 #endif 1042 1043 #define COMMON_DISCARDS \ 1044 SANITIZER_DISCARDS \ 1045 PATCHABLE_DISCARDS \ 1046 *(.discard) \ 1047 *(.discard.*) \ 1048 *(.modinfo) \ 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 *(.data..percpu..first) \ 1072 . = ALIGN(PAGE_SIZE); \ 1073 *(.data..percpu..page_aligned) \ 1074 . = ALIGN(cacheline); \ 1075 *(.data..percpu..read_mostly) \ 1076 . = ALIGN(cacheline); \ 1077 *(.data..percpu) \ 1078 *(.data..percpu..shared_aligned) \ 1079 PERCPU_DECRYPTED_SECTION \ 1080 __per_cpu_end = .; 1081 1082 /** 1083 * PERCPU_VADDR - define output section for percpu area 1084 * @cacheline: cacheline size 1085 * @vaddr: explicit base address (optional) 1086 * @phdr: destination PHDR (optional) 1087 * 1088 * Macro which expands to output section for percpu area. 1089 * 1090 * @cacheline is used to align subsections to avoid false cacheline 1091 * sharing between subsections for different purposes. 1092 * 1093 * If @vaddr is not blank, it specifies explicit base address and all 1094 * percpu symbols will be offset from the given address. If blank, 1095 * @vaddr always equals @laddr + LOAD_OFFSET. 1096 * 1097 * @phdr defines the output PHDR to use if not blank. Be warned that 1098 * output PHDR is sticky. If @phdr is specified, the next output 1099 * section in the linker script will go there too. @phdr should have 1100 * a leading colon. 1101 * 1102 * Note that this macros defines __per_cpu_load as an absolute symbol. 1103 * If there is no need to put the percpu section at a predetermined 1104 * address, use PERCPU_SECTION. 1105 */ 1106 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 1107 __per_cpu_load = .; \ 1108 .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \ 1109 PERCPU_INPUT(cacheline) \ 1110 } phdr \ 1111 . = __per_cpu_load + SIZEOF(.data..percpu); 1112 1113 /** 1114 * PERCPU_SECTION - define output section for percpu area, simple version 1115 * @cacheline: cacheline size 1116 * 1117 * Align to PAGE_SIZE and outputs output section for percpu area. This 1118 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 1119 * __per_cpu_start will be identical. 1120 * 1121 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 1122 * except that __per_cpu_load is defined as a relative symbol against 1123 * .data..percpu which is required for relocatable x86_32 configuration. 1124 */ 1125 #define PERCPU_SECTION(cacheline) \ 1126 . = ALIGN(PAGE_SIZE); \ 1127 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 1128 __per_cpu_load = .; \ 1129 PERCPU_INPUT(cacheline) \ 1130 } 1131 1132 1133 /* 1134 * Definition of the high level *_SECTION macros 1135 * They will fit only a subset of the architectures 1136 */ 1137 1138 1139 /* 1140 * Writeable data. 1141 * All sections are combined in a single .data section. 1142 * The sections following CONSTRUCTORS are arranged so their 1143 * typical alignment matches. 1144 * A cacheline is typical/always less than a PAGE_SIZE so 1145 * the sections that has this restriction (or similar) 1146 * is located before the ones requiring PAGE_SIZE alignment. 1147 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 1148 * matches the requirement of PAGE_ALIGNED_DATA. 1149 * 1150 * use 0 as page_align if page_aligned data is not used */ 1151 #define RW_DATA(cacheline, pagealigned, inittask) \ 1152 . = ALIGN(PAGE_SIZE); \ 1153 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 1154 INIT_TASK_DATA(inittask) \ 1155 NOSAVE_DATA \ 1156 PAGE_ALIGNED_DATA(pagealigned) \ 1157 CACHELINE_ALIGNED_DATA(cacheline) \ 1158 READ_MOSTLY_DATA(cacheline) \ 1159 DATA_DATA \ 1160 CONSTRUCTORS \ 1161 } \ 1162 BUG_TABLE \ 1163 1164 #define INIT_TEXT_SECTION(inittext_align) \ 1165 . = ALIGN(inittext_align); \ 1166 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 1167 _sinittext = .; \ 1168 INIT_TEXT \ 1169 _einittext = .; \ 1170 } 1171 1172 #define INIT_DATA_SECTION(initsetup_align) \ 1173 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 1174 INIT_DATA \ 1175 INIT_SETUP(initsetup_align) \ 1176 INIT_CALLS \ 1177 CON_INITCALL \ 1178 INIT_RAM_FS \ 1179 } 1180 1181 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 1182 . = ALIGN(sbss_align); \ 1183 __bss_start = .; \ 1184 SBSS(sbss_align) \ 1185 BSS(bss_align) \ 1186 . = ALIGN(stop_align); \ 1187 __bss_stop = .; 1188