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 #if __GNUC__ == 4 && __GNUC_MINOR__ == 9 120 #define STRUCT_ALIGNMENT 64 121 #else 122 #define STRUCT_ALIGNMENT 32 123 #endif 124 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT) 125 126 /* 127 * The order of the sched class addresses are important, as they are 128 * used to determine the order of the priority of each sched class in 129 * relation to each other. 130 */ 131 #define SCHED_DATA \ 132 STRUCT_ALIGN(); \ 133 __begin_sched_classes = .; \ 134 *(__idle_sched_class) \ 135 *(__fair_sched_class) \ 136 *(__rt_sched_class) \ 137 *(__dl_sched_class) \ 138 *(__stop_sched_class) \ 139 __end_sched_classes = .; 140 141 /* The actual configuration determine if the init/exit sections 142 * are handled as text/data or they can be discarded (which 143 * often happens at runtime) 144 */ 145 #ifdef CONFIG_HOTPLUG_CPU 146 #define CPU_KEEP(sec) *(.cpu##sec) 147 #define CPU_DISCARD(sec) 148 #else 149 #define CPU_KEEP(sec) 150 #define CPU_DISCARD(sec) *(.cpu##sec) 151 #endif 152 153 #if defined(CONFIG_MEMORY_HOTPLUG) 154 #define MEM_KEEP(sec) *(.mem##sec) 155 #define MEM_DISCARD(sec) 156 #else 157 #define MEM_KEEP(sec) 158 #define MEM_DISCARD(sec) *(.mem##sec) 159 #endif 160 161 #ifdef CONFIG_FTRACE_MCOUNT_RECORD 162 /* 163 * The ftrace call sites are logged to a section whose name depends on the 164 * compiler option used. A given kernel image will only use one, AKA 165 * FTRACE_CALLSITE_SECTION. We capture all of them here to avoid header 166 * dependencies for FTRACE_CALLSITE_SECTION's definition. 167 * 168 * Need to also make ftrace_stub_graph point to ftrace_stub 169 * so that the same stub location may have different protocols 170 * and not mess up with C verifiers. 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 #else 179 # ifdef CONFIG_FUNCTION_TRACER 180 # define MCOUNT_REC() ftrace_stub_graph = ftrace_stub; 181 # else 182 # define MCOUNT_REC() 183 # endif 184 #endif 185 186 #ifdef CONFIG_TRACE_BRANCH_PROFILING 187 #define LIKELY_PROFILE() __start_annotated_branch_profile = .; \ 188 KEEP(*(_ftrace_annotated_branch)) \ 189 __stop_annotated_branch_profile = .; 190 #else 191 #define LIKELY_PROFILE() 192 #endif 193 194 #ifdef CONFIG_PROFILE_ALL_BRANCHES 195 #define BRANCH_PROFILE() __start_branch_profile = .; \ 196 KEEP(*(_ftrace_branch)) \ 197 __stop_branch_profile = .; 198 #else 199 #define BRANCH_PROFILE() 200 #endif 201 202 #ifdef CONFIG_KPROBES 203 #define KPROBE_BLACKLIST() . = ALIGN(8); \ 204 __start_kprobe_blacklist = .; \ 205 KEEP(*(_kprobe_blacklist)) \ 206 __stop_kprobe_blacklist = .; 207 #else 208 #define KPROBE_BLACKLIST() 209 #endif 210 211 #ifdef CONFIG_FUNCTION_ERROR_INJECTION 212 #define ERROR_INJECT_WHITELIST() STRUCT_ALIGN(); \ 213 __start_error_injection_whitelist = .; \ 214 KEEP(*(_error_injection_whitelist)) \ 215 __stop_error_injection_whitelist = .; 216 #else 217 #define ERROR_INJECT_WHITELIST() 218 #endif 219 220 #ifdef CONFIG_EVENT_TRACING 221 #define FTRACE_EVENTS() . = ALIGN(8); \ 222 __start_ftrace_events = .; \ 223 KEEP(*(_ftrace_events)) \ 224 __stop_ftrace_events = .; \ 225 __start_ftrace_eval_maps = .; \ 226 KEEP(*(_ftrace_eval_map)) \ 227 __stop_ftrace_eval_maps = .; 228 #else 229 #define FTRACE_EVENTS() 230 #endif 231 232 #ifdef CONFIG_TRACING 233 #define TRACE_PRINTKS() __start___trace_bprintk_fmt = .; \ 234 KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \ 235 __stop___trace_bprintk_fmt = .; 236 #define TRACEPOINT_STR() __start___tracepoint_str = .; \ 237 KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \ 238 __stop___tracepoint_str = .; 239 #else 240 #define TRACE_PRINTKS() 241 #define TRACEPOINT_STR() 242 #endif 243 244 #ifdef CONFIG_FTRACE_SYSCALLS 245 #define TRACE_SYSCALLS() . = ALIGN(8); \ 246 __start_syscalls_metadata = .; \ 247 KEEP(*(__syscalls_metadata)) \ 248 __stop_syscalls_metadata = .; 249 #else 250 #define TRACE_SYSCALLS() 251 #endif 252 253 #ifdef CONFIG_BPF_EVENTS 254 #define BPF_RAW_TP() STRUCT_ALIGN(); \ 255 __start__bpf_raw_tp = .; \ 256 KEEP(*(__bpf_raw_tp_map)) \ 257 __stop__bpf_raw_tp = .; 258 #else 259 #define BPF_RAW_TP() 260 #endif 261 262 #ifdef CONFIG_SERIAL_EARLYCON 263 #define EARLYCON_TABLE() . = ALIGN(8); \ 264 __earlycon_table = .; \ 265 KEEP(*(__earlycon_table)) \ 266 __earlycon_table_end = .; 267 #else 268 #define EARLYCON_TABLE() 269 #endif 270 271 #ifdef CONFIG_SECURITY 272 #define LSM_TABLE() . = ALIGN(8); \ 273 __start_lsm_info = .; \ 274 KEEP(*(.lsm_info.init)) \ 275 __end_lsm_info = .; 276 #define EARLY_LSM_TABLE() . = ALIGN(8); \ 277 __start_early_lsm_info = .; \ 278 KEEP(*(.early_lsm_info.init)) \ 279 __end_early_lsm_info = .; 280 #else 281 #define LSM_TABLE() 282 #define EARLY_LSM_TABLE() 283 #endif 284 285 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name) 286 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name) 287 #define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name) 288 #define _OF_TABLE_0(name) 289 #define _OF_TABLE_1(name) \ 290 . = ALIGN(8); \ 291 __##name##_of_table = .; \ 292 KEEP(*(__##name##_of_table)) \ 293 KEEP(*(__##name##_of_table_end)) 294 295 #define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer) 296 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip) 297 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk) 298 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem) 299 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method) 300 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method) 301 302 #ifdef CONFIG_ACPI 303 #define ACPI_PROBE_TABLE(name) \ 304 . = ALIGN(8); \ 305 __##name##_acpi_probe_table = .; \ 306 KEEP(*(__##name##_acpi_probe_table)) \ 307 __##name##_acpi_probe_table_end = .; 308 #else 309 #define ACPI_PROBE_TABLE(name) 310 #endif 311 312 #ifdef CONFIG_THERMAL 313 #define THERMAL_TABLE(name) \ 314 . = ALIGN(8); \ 315 __##name##_thermal_table = .; \ 316 KEEP(*(__##name##_thermal_table)) \ 317 __##name##_thermal_table_end = .; 318 #else 319 #define THERMAL_TABLE(name) 320 #endif 321 322 #ifdef CONFIG_DTPM 323 #define DTPM_TABLE() \ 324 . = ALIGN(8); \ 325 __dtpm_table = .; \ 326 KEEP(*(__dtpm_table)) \ 327 __dtpm_table_end = .; 328 #else 329 #define DTPM_TABLE() 330 #endif 331 332 #define KERNEL_DTB() \ 333 STRUCT_ALIGN(); \ 334 __dtb_start = .; \ 335 KEEP(*(.dtb.init.rodata)) \ 336 __dtb_end = .; 337 338 /* 339 * .data section 340 */ 341 #define DATA_DATA \ 342 *(.xiptext) \ 343 *(DATA_MAIN) \ 344 *(.ref.data) \ 345 *(.data..shared_aligned) /* percpu related */ \ 346 MEM_KEEP(init.data*) \ 347 MEM_KEEP(exit.data*) \ 348 *(.data.unlikely) \ 349 __start_once = .; \ 350 *(.data.once) \ 351 __end_once = .; \ 352 STRUCT_ALIGN(); \ 353 *(__tracepoints) \ 354 /* implement dynamic printk debug */ \ 355 . = ALIGN(8); \ 356 __start___dyndbg = .; \ 357 KEEP(*(__dyndbg)) \ 358 __stop___dyndbg = .; \ 359 LIKELY_PROFILE() \ 360 BRANCH_PROFILE() \ 361 TRACE_PRINTKS() \ 362 BPF_RAW_TP() \ 363 TRACEPOINT_STR() 364 365 /* 366 * Data section helpers 367 */ 368 #define NOSAVE_DATA \ 369 . = ALIGN(PAGE_SIZE); \ 370 __nosave_begin = .; \ 371 *(.data..nosave) \ 372 . = ALIGN(PAGE_SIZE); \ 373 __nosave_end = .; 374 375 #define PAGE_ALIGNED_DATA(page_align) \ 376 . = ALIGN(page_align); \ 377 *(.data..page_aligned) \ 378 . = ALIGN(page_align); 379 380 #define READ_MOSTLY_DATA(align) \ 381 . = ALIGN(align); \ 382 *(.data..read_mostly) \ 383 . = ALIGN(align); 384 385 #define CACHELINE_ALIGNED_DATA(align) \ 386 . = ALIGN(align); \ 387 *(.data..cacheline_aligned) 388 389 #define INIT_TASK_DATA(align) \ 390 . = ALIGN(align); \ 391 __start_init_task = .; \ 392 init_thread_union = .; \ 393 init_stack = .; \ 394 KEEP(*(.data..init_task)) \ 395 KEEP(*(.data..init_thread_info)) \ 396 . = __start_init_task + THREAD_SIZE; \ 397 __end_init_task = .; 398 399 #define JUMP_TABLE_DATA \ 400 . = ALIGN(8); \ 401 __start___jump_table = .; \ 402 KEEP(*(__jump_table)) \ 403 __stop___jump_table = .; 404 405 #define STATIC_CALL_DATA \ 406 . = ALIGN(8); \ 407 __start_static_call_sites = .; \ 408 KEEP(*(.static_call_sites)) \ 409 __stop_static_call_sites = .; \ 410 __start_static_call_tramp_key = .; \ 411 KEEP(*(.static_call_tramp_key)) \ 412 __stop_static_call_tramp_key = .; 413 414 /* 415 * Allow architectures to handle ro_after_init data on their 416 * own by defining an empty RO_AFTER_INIT_DATA. 417 */ 418 #ifndef RO_AFTER_INIT_DATA 419 #define RO_AFTER_INIT_DATA \ 420 . = ALIGN(8); \ 421 __start_ro_after_init = .; \ 422 *(.data..ro_after_init) \ 423 JUMP_TABLE_DATA \ 424 STATIC_CALL_DATA \ 425 __end_ro_after_init = .; 426 #endif 427 428 /* 429 * Read only Data 430 */ 431 #define RO_DATA(align) \ 432 . = ALIGN((align)); \ 433 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 434 __start_rodata = .; \ 435 *(.rodata) *(.rodata.*) \ 436 SCHED_DATA \ 437 RO_AFTER_INIT_DATA /* Read only after init */ \ 438 . = ALIGN(8); \ 439 __start___tracepoints_ptrs = .; \ 440 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \ 441 __stop___tracepoints_ptrs = .; \ 442 *(__tracepoints_strings)/* Tracepoints: strings */ \ 443 } \ 444 \ 445 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 446 *(.rodata1) \ 447 } \ 448 \ 449 /* PCI quirks */ \ 450 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 451 __start_pci_fixups_early = .; \ 452 KEEP(*(.pci_fixup_early)) \ 453 __end_pci_fixups_early = .; \ 454 __start_pci_fixups_header = .; \ 455 KEEP(*(.pci_fixup_header)) \ 456 __end_pci_fixups_header = .; \ 457 __start_pci_fixups_final = .; \ 458 KEEP(*(.pci_fixup_final)) \ 459 __end_pci_fixups_final = .; \ 460 __start_pci_fixups_enable = .; \ 461 KEEP(*(.pci_fixup_enable)) \ 462 __end_pci_fixups_enable = .; \ 463 __start_pci_fixups_resume = .; \ 464 KEEP(*(.pci_fixup_resume)) \ 465 __end_pci_fixups_resume = .; \ 466 __start_pci_fixups_resume_early = .; \ 467 KEEP(*(.pci_fixup_resume_early)) \ 468 __end_pci_fixups_resume_early = .; \ 469 __start_pci_fixups_suspend = .; \ 470 KEEP(*(.pci_fixup_suspend)) \ 471 __end_pci_fixups_suspend = .; \ 472 __start_pci_fixups_suspend_late = .; \ 473 KEEP(*(.pci_fixup_suspend_late)) \ 474 __end_pci_fixups_suspend_late = .; \ 475 } \ 476 \ 477 /* Built-in firmware blobs */ \ 478 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) { \ 479 __start_builtin_fw = .; \ 480 KEEP(*(.builtin_fw)) \ 481 __end_builtin_fw = .; \ 482 } \ 483 \ 484 TRACEDATA \ 485 \ 486 /* Kernel symbol table: Normal symbols */ \ 487 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 488 __start___ksymtab = .; \ 489 KEEP(*(SORT(___ksymtab+*))) \ 490 __stop___ksymtab = .; \ 491 } \ 492 \ 493 /* Kernel symbol table: GPL-only symbols */ \ 494 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 495 __start___ksymtab_gpl = .; \ 496 KEEP(*(SORT(___ksymtab_gpl+*))) \ 497 __stop___ksymtab_gpl = .; \ 498 } \ 499 \ 500 /* Kernel symbol table: Normal symbols */ \ 501 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 502 __start___kcrctab = .; \ 503 KEEP(*(SORT(___kcrctab+*))) \ 504 __stop___kcrctab = .; \ 505 } \ 506 \ 507 /* Kernel symbol table: GPL-only symbols */ \ 508 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 509 __start___kcrctab_gpl = .; \ 510 KEEP(*(SORT(___kcrctab_gpl+*))) \ 511 __stop___kcrctab_gpl = .; \ 512 } \ 513 \ 514 /* Kernel symbol table: strings */ \ 515 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 516 *(__ksymtab_strings) \ 517 } \ 518 \ 519 /* __*init sections */ \ 520 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 521 *(.ref.rodata) \ 522 MEM_KEEP(init.rodata) \ 523 MEM_KEEP(exit.rodata) \ 524 } \ 525 \ 526 /* Built-in module parameters. */ \ 527 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 528 __start___param = .; \ 529 KEEP(*(__param)) \ 530 __stop___param = .; \ 531 } \ 532 \ 533 /* Built-in module versions. */ \ 534 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 535 __start___modver = .; \ 536 KEEP(*(__modver)) \ 537 __stop___modver = .; \ 538 } \ 539 \ 540 RO_EXCEPTION_TABLE \ 541 NOTES \ 542 BTF \ 543 \ 544 . = ALIGN((align)); \ 545 __end_rodata = .; 546 547 548 /* 549 * .text..L.cfi.jumptable.* contain Control-Flow Integrity (CFI) 550 * jump table entries. 551 */ 552 #ifdef CONFIG_CFI_CLANG 553 #define TEXT_CFI_JT \ 554 . = ALIGN(PMD_SIZE); \ 555 __cfi_jt_start = .; \ 556 *(.text..L.cfi.jumptable .text..L.cfi.jumptable.*) \ 557 . = ALIGN(PMD_SIZE); \ 558 __cfi_jt_end = .; 559 #else 560 #define TEXT_CFI_JT 561 #endif 562 563 /* 564 * Non-instrumentable text section 565 */ 566 #define NOINSTR_TEXT \ 567 ALIGN_FUNCTION(); \ 568 __noinstr_text_start = .; \ 569 *(.noinstr.text) \ 570 __noinstr_text_end = .; 571 572 /* 573 * .text section. Map to function alignment to avoid address changes 574 * during second ld run in second ld pass when generating System.map 575 * 576 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead 577 * code elimination is enabled, so these sections should be converted 578 * to use ".." first. 579 */ 580 #define TEXT_TEXT \ 581 ALIGN_FUNCTION(); \ 582 *(.text.hot .text.hot.*) \ 583 *(TEXT_MAIN .text.fixup) \ 584 *(.text.unlikely .text.unlikely.*) \ 585 *(.text.unknown .text.unknown.*) \ 586 NOINSTR_TEXT \ 587 *(.text..refcount) \ 588 *(.ref.text) \ 589 TEXT_CFI_JT \ 590 MEM_KEEP(init.text*) \ 591 MEM_KEEP(exit.text*) \ 592 593 594 /* sched.text is aling to function alignment to secure we have same 595 * address even at second ld pass when generating System.map */ 596 #define SCHED_TEXT \ 597 ALIGN_FUNCTION(); \ 598 __sched_text_start = .; \ 599 *(.sched.text) \ 600 __sched_text_end = .; 601 602 /* spinlock.text is aling to function alignment to secure we have same 603 * address even at second ld pass when generating System.map */ 604 #define LOCK_TEXT \ 605 ALIGN_FUNCTION(); \ 606 __lock_text_start = .; \ 607 *(.spinlock.text) \ 608 __lock_text_end = .; 609 610 #define CPUIDLE_TEXT \ 611 ALIGN_FUNCTION(); \ 612 __cpuidle_text_start = .; \ 613 *(.cpuidle.text) \ 614 __cpuidle_text_end = .; 615 616 #define KPROBES_TEXT \ 617 ALIGN_FUNCTION(); \ 618 __kprobes_text_start = .; \ 619 *(.kprobes.text) \ 620 __kprobes_text_end = .; 621 622 #define ENTRY_TEXT \ 623 ALIGN_FUNCTION(); \ 624 __entry_text_start = .; \ 625 *(.entry.text) \ 626 __entry_text_end = .; 627 628 #define IRQENTRY_TEXT \ 629 ALIGN_FUNCTION(); \ 630 __irqentry_text_start = .; \ 631 *(.irqentry.text) \ 632 __irqentry_text_end = .; 633 634 #define SOFTIRQENTRY_TEXT \ 635 ALIGN_FUNCTION(); \ 636 __softirqentry_text_start = .; \ 637 *(.softirqentry.text) \ 638 __softirqentry_text_end = .; 639 640 #define STATIC_CALL_TEXT \ 641 ALIGN_FUNCTION(); \ 642 __static_call_text_start = .; \ 643 *(.static_call.text) \ 644 __static_call_text_end = .; 645 646 /* Section used for early init (in .S files) */ 647 #define HEAD_TEXT KEEP(*(.head.text)) 648 649 #define HEAD_TEXT_SECTION \ 650 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 651 HEAD_TEXT \ 652 } 653 654 /* 655 * Exception table 656 */ 657 #define EXCEPTION_TABLE(align) \ 658 . = ALIGN(align); \ 659 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 660 __start___ex_table = .; \ 661 KEEP(*(__ex_table)) \ 662 __stop___ex_table = .; \ 663 } 664 665 /* 666 * .BTF 667 */ 668 #ifdef CONFIG_DEBUG_INFO_BTF 669 #define BTF \ 670 .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \ 671 __start_BTF = .; \ 672 KEEP(*(.BTF)) \ 673 __stop_BTF = .; \ 674 } \ 675 . = ALIGN(4); \ 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 MEM_DISCARD(init.data*) \ 709 KERNEL_CTORS() \ 710 MCOUNT_REC() \ 711 *(.init.rodata .init.rodata.*) \ 712 FTRACE_EVENTS() \ 713 TRACE_SYSCALLS() \ 714 KPROBE_BLACKLIST() \ 715 ERROR_INJECT_WHITELIST() \ 716 MEM_DISCARD(init.rodata) \ 717 CLK_OF_TABLES() \ 718 RESERVEDMEM_OF_TABLES() \ 719 TIMER_OF_TABLES() \ 720 CPU_METHOD_OF_TABLES() \ 721 CPUIDLE_METHOD_OF_TABLES() \ 722 KERNEL_DTB() \ 723 IRQCHIP_OF_MATCH_TABLE() \ 724 ACPI_PROBE_TABLE(irqchip) \ 725 ACPI_PROBE_TABLE(timer) \ 726 THERMAL_TABLE(governor) \ 727 DTPM_TABLE() \ 728 EARLYCON_TABLE() \ 729 LSM_TABLE() \ 730 EARLY_LSM_TABLE() \ 731 KUNIT_TABLE() 732 733 #define INIT_TEXT \ 734 *(.init.text .init.text.*) \ 735 *(.text.startup) \ 736 MEM_DISCARD(init.text*) 737 738 #define EXIT_DATA \ 739 *(.exit.data .exit.data.*) \ 740 *(.fini_array .fini_array.*) \ 741 *(.dtors .dtors.*) \ 742 MEM_DISCARD(exit.data*) \ 743 MEM_DISCARD(exit.rodata*) 744 745 #define EXIT_TEXT \ 746 *(.exit.text) \ 747 *(.text.exit) \ 748 MEM_DISCARD(exit.text) 749 750 #define EXIT_CALL \ 751 *(.exitcall.exit) 752 753 /* 754 * bss (Block Started by Symbol) - uninitialized data 755 * zeroed during startup 756 */ 757 #define SBSS(sbss_align) \ 758 . = ALIGN(sbss_align); \ 759 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 760 *(.dynsbss) \ 761 *(SBSS_MAIN) \ 762 *(.scommon) \ 763 } 764 765 /* 766 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 767 * sections to the front of bss. 768 */ 769 #ifndef BSS_FIRST_SECTIONS 770 #define BSS_FIRST_SECTIONS 771 #endif 772 773 #define BSS(bss_align) \ 774 . = ALIGN(bss_align); \ 775 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 776 BSS_FIRST_SECTIONS \ 777 . = ALIGN(PAGE_SIZE); \ 778 *(.bss..page_aligned) \ 779 . = ALIGN(PAGE_SIZE); \ 780 *(.dynbss) \ 781 *(BSS_MAIN) \ 782 *(COMMON) \ 783 } 784 785 /* 786 * DWARF debug sections. 787 * Symbols in the DWARF debugging sections are relative to 788 * the beginning of the section so we begin them at 0. 789 */ 790 #define DWARF_DEBUG \ 791 /* DWARF 1 */ \ 792 .debug 0 : { *(.debug) } \ 793 .line 0 : { *(.line) } \ 794 /* GNU DWARF 1 extensions */ \ 795 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 796 .debug_sfnames 0 : { *(.debug_sfnames) } \ 797 /* DWARF 1.1 and DWARF 2 */ \ 798 .debug_aranges 0 : { *(.debug_aranges) } \ 799 .debug_pubnames 0 : { *(.debug_pubnames) } \ 800 /* DWARF 2 */ \ 801 .debug_info 0 : { *(.debug_info \ 802 .gnu.linkonce.wi.*) } \ 803 .debug_abbrev 0 : { *(.debug_abbrev) } \ 804 .debug_line 0 : { *(.debug_line) } \ 805 .debug_frame 0 : { *(.debug_frame) } \ 806 .debug_str 0 : { *(.debug_str) } \ 807 .debug_loc 0 : { *(.debug_loc) } \ 808 .debug_macinfo 0 : { *(.debug_macinfo) } \ 809 .debug_pubtypes 0 : { *(.debug_pubtypes) } \ 810 /* DWARF 3 */ \ 811 .debug_ranges 0 : { *(.debug_ranges) } \ 812 /* SGI/MIPS DWARF 2 extensions */ \ 813 .debug_weaknames 0 : { *(.debug_weaknames) } \ 814 .debug_funcnames 0 : { *(.debug_funcnames) } \ 815 .debug_typenames 0 : { *(.debug_typenames) } \ 816 .debug_varnames 0 : { *(.debug_varnames) } \ 817 /* GNU DWARF 2 extensions */ \ 818 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \ 819 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \ 820 /* DWARF 4 */ \ 821 .debug_types 0 : { *(.debug_types) } \ 822 /* DWARF 5 */ \ 823 .debug_addr 0 : { *(.debug_addr) } \ 824 .debug_line_str 0 : { *(.debug_line_str) } \ 825 .debug_loclists 0 : { *(.debug_loclists) } \ 826 .debug_macro 0 : { *(.debug_macro) } \ 827 .debug_names 0 : { *(.debug_names) } \ 828 .debug_rnglists 0 : { *(.debug_rnglists) } \ 829 .debug_str_offsets 0 : { *(.debug_str_offsets) } 830 831 /* Stabs debugging sections. */ 832 #define STABS_DEBUG \ 833 .stab 0 : { *(.stab) } \ 834 .stabstr 0 : { *(.stabstr) } \ 835 .stab.excl 0 : { *(.stab.excl) } \ 836 .stab.exclstr 0 : { *(.stab.exclstr) } \ 837 .stab.index 0 : { *(.stab.index) } \ 838 .stab.indexstr 0 : { *(.stab.indexstr) } 839 840 /* Required sections not related to debugging. */ 841 #define ELF_DETAILS \ 842 .comment 0 : { *(.comment) } \ 843 .symtab 0 : { *(.symtab) } \ 844 .strtab 0 : { *(.strtab) } \ 845 .shstrtab 0 : { *(.shstrtab) } 846 847 #ifdef CONFIG_GENERIC_BUG 848 #define BUG_TABLE \ 849 . = ALIGN(8); \ 850 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 851 __start___bug_table = .; \ 852 KEEP(*(__bug_table)) \ 853 __stop___bug_table = .; \ 854 } 855 #else 856 #define BUG_TABLE 857 #endif 858 859 #ifdef CONFIG_UNWINDER_ORC 860 #define ORC_UNWIND_TABLE \ 861 . = ALIGN(4); \ 862 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \ 863 __start_orc_unwind_ip = .; \ 864 KEEP(*(.orc_unwind_ip)) \ 865 __stop_orc_unwind_ip = .; \ 866 } \ 867 . = ALIGN(2); \ 868 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \ 869 __start_orc_unwind = .; \ 870 KEEP(*(.orc_unwind)) \ 871 __stop_orc_unwind = .; \ 872 } \ 873 . = ALIGN(4); \ 874 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \ 875 orc_lookup = .; \ 876 . += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) / \ 877 LOOKUP_BLOCK_SIZE) + 1) * 4; \ 878 orc_lookup_end = .; \ 879 } 880 #else 881 #define ORC_UNWIND_TABLE 882 #endif 883 884 #ifdef CONFIG_PM_TRACE 885 #define TRACEDATA \ 886 . = ALIGN(4); \ 887 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 888 __tracedata_start = .; \ 889 KEEP(*(.tracedata)) \ 890 __tracedata_end = .; \ 891 } 892 #else 893 #define TRACEDATA 894 #endif 895 896 #define NOTES \ 897 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 898 __start_notes = .; \ 899 KEEP(*(.note.*)) \ 900 __stop_notes = .; \ 901 } NOTES_HEADERS \ 902 NOTES_HEADERS_RESTORE 903 904 #define INIT_SETUP(initsetup_align) \ 905 . = ALIGN(initsetup_align); \ 906 __setup_start = .; \ 907 KEEP(*(.init.setup)) \ 908 __setup_end = .; 909 910 #define INIT_CALLS_LEVEL(level) \ 911 __initcall##level##_start = .; \ 912 KEEP(*(.initcall##level##.init)) \ 913 KEEP(*(.initcall##level##s.init)) \ 914 915 #define INIT_CALLS \ 916 __initcall_start = .; \ 917 KEEP(*(.initcallearly.init)) \ 918 INIT_CALLS_LEVEL(0) \ 919 INIT_CALLS_LEVEL(1) \ 920 INIT_CALLS_LEVEL(2) \ 921 INIT_CALLS_LEVEL(3) \ 922 INIT_CALLS_LEVEL(4) \ 923 INIT_CALLS_LEVEL(5) \ 924 INIT_CALLS_LEVEL(rootfs) \ 925 INIT_CALLS_LEVEL(6) \ 926 INIT_CALLS_LEVEL(7) \ 927 __initcall_end = .; 928 929 #define CON_INITCALL \ 930 __con_initcall_start = .; \ 931 KEEP(*(.con_initcall.init)) \ 932 __con_initcall_end = .; 933 934 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */ 935 #define KUNIT_TABLE() \ 936 . = ALIGN(8); \ 937 __kunit_suites_start = .; \ 938 KEEP(*(.kunit_test_suites)) \ 939 __kunit_suites_end = .; 940 941 #ifdef CONFIG_BLK_DEV_INITRD 942 #define INIT_RAM_FS \ 943 . = ALIGN(4); \ 944 __initramfs_start = .; \ 945 KEEP(*(.init.ramfs)) \ 946 . = ALIGN(8); \ 947 KEEP(*(.init.ramfs.info)) 948 #else 949 #define INIT_RAM_FS 950 #endif 951 952 /* 953 * Memory encryption operates on a page basis. Since we need to clear 954 * the memory encryption mask for this section, it needs to be aligned 955 * on a page boundary and be a page-size multiple in length. 956 * 957 * Note: We use a separate section so that only this section gets 958 * decrypted to avoid exposing more than we wish. 959 */ 960 #ifdef CONFIG_AMD_MEM_ENCRYPT 961 #define PERCPU_DECRYPTED_SECTION \ 962 . = ALIGN(PAGE_SIZE); \ 963 *(.data..percpu..decrypted) \ 964 . = ALIGN(PAGE_SIZE); 965 #else 966 #define PERCPU_DECRYPTED_SECTION 967 #endif 968 969 970 /* 971 * Default discarded sections. 972 * 973 * Some archs want to discard exit text/data at runtime rather than 974 * link time due to cross-section references such as alt instructions, 975 * bug table, eh_frame, etc. DISCARDS must be the last of output 976 * section definitions so that such archs put those in earlier section 977 * definitions. 978 */ 979 #ifdef RUNTIME_DISCARD_EXIT 980 #define EXIT_DISCARDS 981 #else 982 #define EXIT_DISCARDS \ 983 EXIT_TEXT \ 984 EXIT_DATA 985 #endif 986 987 /* 988 * Clang's -fprofile-arcs, -fsanitize=kernel-address, and 989 * -fsanitize=thread produce unwanted sections (.eh_frame 990 * and .init_array.*), but CONFIG_CONSTRUCTORS wants to 991 * keep any .init_array.* sections. 992 * https://bugs.llvm.org/show_bug.cgi?id=46478 993 */ 994 #if defined(CONFIG_GCOV_KERNEL) || defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN) || \ 995 defined(CONFIG_CFI_CLANG) 996 # ifdef CONFIG_CONSTRUCTORS 997 # define SANITIZER_DISCARDS \ 998 *(.eh_frame) 999 # else 1000 # define SANITIZER_DISCARDS \ 1001 *(.init_array) *(.init_array.*) \ 1002 *(.eh_frame) 1003 # endif 1004 #else 1005 # define SANITIZER_DISCARDS 1006 #endif 1007 1008 #define COMMON_DISCARDS \ 1009 SANITIZER_DISCARDS \ 1010 *(.discard) \ 1011 *(.discard.*) \ 1012 *(.modinfo) \ 1013 /* ld.bfd warns about .gnu.version* even when not emitted */ \ 1014 *(.gnu.version*) \ 1015 1016 #define DISCARDS \ 1017 /DISCARD/ : { \ 1018 EXIT_DISCARDS \ 1019 EXIT_CALL \ 1020 COMMON_DISCARDS \ 1021 } 1022 1023 /** 1024 * PERCPU_INPUT - the percpu input sections 1025 * @cacheline: cacheline size 1026 * 1027 * The core percpu section names and core symbols which do not rely 1028 * directly upon load addresses. 1029 * 1030 * @cacheline is used to align subsections to avoid false cacheline 1031 * sharing between subsections for different purposes. 1032 */ 1033 #define PERCPU_INPUT(cacheline) \ 1034 __per_cpu_start = .; \ 1035 *(.data..percpu..first) \ 1036 . = ALIGN(PAGE_SIZE); \ 1037 *(.data..percpu..page_aligned) \ 1038 . = ALIGN(cacheline); \ 1039 *(.data..percpu..read_mostly) \ 1040 . = ALIGN(cacheline); \ 1041 *(.data..percpu) \ 1042 *(.data..percpu..shared_aligned) \ 1043 PERCPU_DECRYPTED_SECTION \ 1044 __per_cpu_end = .; 1045 1046 /** 1047 * PERCPU_VADDR - define output section for percpu area 1048 * @cacheline: cacheline size 1049 * @vaddr: explicit base address (optional) 1050 * @phdr: destination PHDR (optional) 1051 * 1052 * Macro which expands to output section for percpu area. 1053 * 1054 * @cacheline is used to align subsections to avoid false cacheline 1055 * sharing between subsections for different purposes. 1056 * 1057 * If @vaddr is not blank, it specifies explicit base address and all 1058 * percpu symbols will be offset from the given address. If blank, 1059 * @vaddr always equals @laddr + LOAD_OFFSET. 1060 * 1061 * @phdr defines the output PHDR to use if not blank. Be warned that 1062 * output PHDR is sticky. If @phdr is specified, the next output 1063 * section in the linker script will go there too. @phdr should have 1064 * a leading colon. 1065 * 1066 * Note that this macros defines __per_cpu_load as an absolute symbol. 1067 * If there is no need to put the percpu section at a predetermined 1068 * address, use PERCPU_SECTION. 1069 */ 1070 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 1071 __per_cpu_load = .; \ 1072 .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \ 1073 PERCPU_INPUT(cacheline) \ 1074 } phdr \ 1075 . = __per_cpu_load + SIZEOF(.data..percpu); 1076 1077 /** 1078 * PERCPU_SECTION - define output section for percpu area, simple version 1079 * @cacheline: cacheline size 1080 * 1081 * Align to PAGE_SIZE and outputs output section for percpu area. This 1082 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 1083 * __per_cpu_start will be identical. 1084 * 1085 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 1086 * except that __per_cpu_load is defined as a relative symbol against 1087 * .data..percpu which is required for relocatable x86_32 configuration. 1088 */ 1089 #define PERCPU_SECTION(cacheline) \ 1090 . = ALIGN(PAGE_SIZE); \ 1091 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 1092 __per_cpu_load = .; \ 1093 PERCPU_INPUT(cacheline) \ 1094 } 1095 1096 1097 /* 1098 * Definition of the high level *_SECTION macros 1099 * They will fit only a subset of the architectures 1100 */ 1101 1102 1103 /* 1104 * Writeable data. 1105 * All sections are combined in a single .data section. 1106 * The sections following CONSTRUCTORS are arranged so their 1107 * typical alignment matches. 1108 * A cacheline is typical/always less than a PAGE_SIZE so 1109 * the sections that has this restriction (or similar) 1110 * is located before the ones requiring PAGE_SIZE alignment. 1111 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 1112 * matches the requirement of PAGE_ALIGNED_DATA. 1113 * 1114 * use 0 as page_align if page_aligned data is not used */ 1115 #define RW_DATA(cacheline, pagealigned, inittask) \ 1116 . = ALIGN(PAGE_SIZE); \ 1117 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 1118 INIT_TASK_DATA(inittask) \ 1119 NOSAVE_DATA \ 1120 PAGE_ALIGNED_DATA(pagealigned) \ 1121 CACHELINE_ALIGNED_DATA(cacheline) \ 1122 READ_MOSTLY_DATA(cacheline) \ 1123 DATA_DATA \ 1124 CONSTRUCTORS \ 1125 } \ 1126 BUG_TABLE \ 1127 1128 #define INIT_TEXT_SECTION(inittext_align) \ 1129 . = ALIGN(inittext_align); \ 1130 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 1131 _sinittext = .; \ 1132 INIT_TEXT \ 1133 _einittext = .; \ 1134 } 1135 1136 #define INIT_DATA_SECTION(initsetup_align) \ 1137 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 1138 INIT_DATA \ 1139 INIT_SETUP(initsetup_align) \ 1140 INIT_CALLS \ 1141 CON_INITCALL \ 1142 INIT_RAM_FS \ 1143 } 1144 1145 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 1146 . = ALIGN(sbss_align); \ 1147 __bss_start = .; \ 1148 SBSS(sbss_align) \ 1149 BSS(bss_align) \ 1150 . = ALIGN(stop_align); \ 1151 __bss_stop = .; 1152