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.asan.* .text.tsan.*) \ 590 TEXT_CFI_JT \ 591 MEM_KEEP(init.text*) \ 592 MEM_KEEP(exit.text*) \ 593 594 595 /* sched.text is aling to function alignment to secure we have same 596 * address even at second ld pass when generating System.map */ 597 #define SCHED_TEXT \ 598 ALIGN_FUNCTION(); \ 599 __sched_text_start = .; \ 600 *(.sched.text) \ 601 __sched_text_end = .; 602 603 /* spinlock.text is aling to function alignment to secure we have same 604 * address even at second ld pass when generating System.map */ 605 #define LOCK_TEXT \ 606 ALIGN_FUNCTION(); \ 607 __lock_text_start = .; \ 608 *(.spinlock.text) \ 609 __lock_text_end = .; 610 611 #define CPUIDLE_TEXT \ 612 ALIGN_FUNCTION(); \ 613 __cpuidle_text_start = .; \ 614 *(.cpuidle.text) \ 615 __cpuidle_text_end = .; 616 617 #define KPROBES_TEXT \ 618 ALIGN_FUNCTION(); \ 619 __kprobes_text_start = .; \ 620 *(.kprobes.text) \ 621 __kprobes_text_end = .; 622 623 #define ENTRY_TEXT \ 624 ALIGN_FUNCTION(); \ 625 __entry_text_start = .; \ 626 *(.entry.text) \ 627 __entry_text_end = .; 628 629 #define IRQENTRY_TEXT \ 630 ALIGN_FUNCTION(); \ 631 __irqentry_text_start = .; \ 632 *(.irqentry.text) \ 633 __irqentry_text_end = .; 634 635 #define SOFTIRQENTRY_TEXT \ 636 ALIGN_FUNCTION(); \ 637 __softirqentry_text_start = .; \ 638 *(.softirqentry.text) \ 639 __softirqentry_text_end = .; 640 641 #define STATIC_CALL_TEXT \ 642 ALIGN_FUNCTION(); \ 643 __static_call_text_start = .; \ 644 *(.static_call.text) \ 645 __static_call_text_end = .; 646 647 /* Section used for early init (in .S files) */ 648 #define HEAD_TEXT KEEP(*(.head.text)) 649 650 #define HEAD_TEXT_SECTION \ 651 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 652 HEAD_TEXT \ 653 } 654 655 /* 656 * Exception table 657 */ 658 #define EXCEPTION_TABLE(align) \ 659 . = ALIGN(align); \ 660 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 661 __start___ex_table = .; \ 662 KEEP(*(__ex_table)) \ 663 __stop___ex_table = .; \ 664 } 665 666 /* 667 * .BTF 668 */ 669 #ifdef CONFIG_DEBUG_INFO_BTF 670 #define BTF \ 671 .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \ 672 __start_BTF = .; \ 673 KEEP(*(.BTF)) \ 674 __stop_BTF = .; \ 675 } \ 676 . = ALIGN(4); \ 677 .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) { \ 678 *(.BTF_ids) \ 679 } 680 #else 681 #define BTF 682 #endif 683 684 /* 685 * Init task 686 */ 687 #define INIT_TASK_DATA_SECTION(align) \ 688 . = ALIGN(align); \ 689 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 690 INIT_TASK_DATA(align) \ 691 } 692 693 #ifdef CONFIG_CONSTRUCTORS 694 #define KERNEL_CTORS() . = ALIGN(8); \ 695 __ctors_start = .; \ 696 KEEP(*(SORT(.ctors.*))) \ 697 KEEP(*(.ctors)) \ 698 KEEP(*(SORT(.init_array.*))) \ 699 KEEP(*(.init_array)) \ 700 __ctors_end = .; 701 #else 702 #define KERNEL_CTORS() 703 #endif 704 705 /* init and exit section handling */ 706 #define INIT_DATA \ 707 KEEP(*(SORT(___kentry+*))) \ 708 *(.init.data init.data.*) \ 709 MEM_DISCARD(init.data*) \ 710 KERNEL_CTORS() \ 711 MCOUNT_REC() \ 712 *(.init.rodata .init.rodata.*) \ 713 FTRACE_EVENTS() \ 714 TRACE_SYSCALLS() \ 715 KPROBE_BLACKLIST() \ 716 ERROR_INJECT_WHITELIST() \ 717 MEM_DISCARD(init.rodata) \ 718 CLK_OF_TABLES() \ 719 RESERVEDMEM_OF_TABLES() \ 720 TIMER_OF_TABLES() \ 721 CPU_METHOD_OF_TABLES() \ 722 CPUIDLE_METHOD_OF_TABLES() \ 723 KERNEL_DTB() \ 724 IRQCHIP_OF_MATCH_TABLE() \ 725 ACPI_PROBE_TABLE(irqchip) \ 726 ACPI_PROBE_TABLE(timer) \ 727 THERMAL_TABLE(governor) \ 728 DTPM_TABLE() \ 729 EARLYCON_TABLE() \ 730 LSM_TABLE() \ 731 EARLY_LSM_TABLE() \ 732 KUNIT_TABLE() 733 734 #define INIT_TEXT \ 735 *(.init.text .init.text.*) \ 736 *(.text.startup) \ 737 MEM_DISCARD(init.text*) 738 739 #define EXIT_DATA \ 740 *(.exit.data .exit.data.*) \ 741 *(.fini_array .fini_array.*) \ 742 *(.dtors .dtors.*) \ 743 MEM_DISCARD(exit.data*) \ 744 MEM_DISCARD(exit.rodata*) 745 746 #define EXIT_TEXT \ 747 *(.exit.text) \ 748 *(.text.exit) \ 749 MEM_DISCARD(exit.text) 750 751 #define EXIT_CALL \ 752 *(.exitcall.exit) 753 754 /* 755 * bss (Block Started by Symbol) - uninitialized data 756 * zeroed during startup 757 */ 758 #define SBSS(sbss_align) \ 759 . = ALIGN(sbss_align); \ 760 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 761 *(.dynsbss) \ 762 *(SBSS_MAIN) \ 763 *(.scommon) \ 764 } 765 766 /* 767 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 768 * sections to the front of bss. 769 */ 770 #ifndef BSS_FIRST_SECTIONS 771 #define BSS_FIRST_SECTIONS 772 #endif 773 774 #define BSS(bss_align) \ 775 . = ALIGN(bss_align); \ 776 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 777 BSS_FIRST_SECTIONS \ 778 . = ALIGN(PAGE_SIZE); \ 779 *(.bss..page_aligned) \ 780 . = ALIGN(PAGE_SIZE); \ 781 *(.dynbss) \ 782 *(BSS_MAIN) \ 783 *(COMMON) \ 784 } 785 786 /* 787 * DWARF debug sections. 788 * Symbols in the DWARF debugging sections are relative to 789 * the beginning of the section so we begin them at 0. 790 */ 791 #define DWARF_DEBUG \ 792 /* DWARF 1 */ \ 793 .debug 0 : { *(.debug) } \ 794 .line 0 : { *(.line) } \ 795 /* GNU DWARF 1 extensions */ \ 796 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 797 .debug_sfnames 0 : { *(.debug_sfnames) } \ 798 /* DWARF 1.1 and DWARF 2 */ \ 799 .debug_aranges 0 : { *(.debug_aranges) } \ 800 .debug_pubnames 0 : { *(.debug_pubnames) } \ 801 /* DWARF 2 */ \ 802 .debug_info 0 : { *(.debug_info \ 803 .gnu.linkonce.wi.*) } \ 804 .debug_abbrev 0 : { *(.debug_abbrev) } \ 805 .debug_line 0 : { *(.debug_line) } \ 806 .debug_frame 0 : { *(.debug_frame) } \ 807 .debug_str 0 : { *(.debug_str) } \ 808 .debug_loc 0 : { *(.debug_loc) } \ 809 .debug_macinfo 0 : { *(.debug_macinfo) } \ 810 .debug_pubtypes 0 : { *(.debug_pubtypes) } \ 811 /* DWARF 3 */ \ 812 .debug_ranges 0 : { *(.debug_ranges) } \ 813 /* SGI/MIPS DWARF 2 extensions */ \ 814 .debug_weaknames 0 : { *(.debug_weaknames) } \ 815 .debug_funcnames 0 : { *(.debug_funcnames) } \ 816 .debug_typenames 0 : { *(.debug_typenames) } \ 817 .debug_varnames 0 : { *(.debug_varnames) } \ 818 /* GNU DWARF 2 extensions */ \ 819 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \ 820 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \ 821 /* DWARF 4 */ \ 822 .debug_types 0 : { *(.debug_types) } \ 823 /* DWARF 5 */ \ 824 .debug_addr 0 : { *(.debug_addr) } \ 825 .debug_line_str 0 : { *(.debug_line_str) } \ 826 .debug_loclists 0 : { *(.debug_loclists) } \ 827 .debug_macro 0 : { *(.debug_macro) } \ 828 .debug_names 0 : { *(.debug_names) } \ 829 .debug_rnglists 0 : { *(.debug_rnglists) } \ 830 .debug_str_offsets 0 : { *(.debug_str_offsets) } 831 832 /* Stabs debugging sections. */ 833 #define STABS_DEBUG \ 834 .stab 0 : { *(.stab) } \ 835 .stabstr 0 : { *(.stabstr) } \ 836 .stab.excl 0 : { *(.stab.excl) } \ 837 .stab.exclstr 0 : { *(.stab.exclstr) } \ 838 .stab.index 0 : { *(.stab.index) } \ 839 .stab.indexstr 0 : { *(.stab.indexstr) } 840 841 /* Required sections not related to debugging. */ 842 #define ELF_DETAILS \ 843 .comment 0 : { *(.comment) } \ 844 .symtab 0 : { *(.symtab) } \ 845 .strtab 0 : { *(.strtab) } \ 846 .shstrtab 0 : { *(.shstrtab) } 847 848 #ifdef CONFIG_GENERIC_BUG 849 #define BUG_TABLE \ 850 . = ALIGN(8); \ 851 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 852 __start___bug_table = .; \ 853 KEEP(*(__bug_table)) \ 854 __stop___bug_table = .; \ 855 } 856 #else 857 #define BUG_TABLE 858 #endif 859 860 #ifdef CONFIG_UNWINDER_ORC 861 #define ORC_UNWIND_TABLE \ 862 . = ALIGN(4); \ 863 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \ 864 __start_orc_unwind_ip = .; \ 865 KEEP(*(.orc_unwind_ip)) \ 866 __stop_orc_unwind_ip = .; \ 867 } \ 868 . = ALIGN(2); \ 869 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \ 870 __start_orc_unwind = .; \ 871 KEEP(*(.orc_unwind)) \ 872 __stop_orc_unwind = .; \ 873 } \ 874 . = ALIGN(4); \ 875 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \ 876 orc_lookup = .; \ 877 . += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) / \ 878 LOOKUP_BLOCK_SIZE) + 1) * 4; \ 879 orc_lookup_end = .; \ 880 } 881 #else 882 #define ORC_UNWIND_TABLE 883 #endif 884 885 #ifdef CONFIG_PM_TRACE 886 #define TRACEDATA \ 887 . = ALIGN(4); \ 888 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 889 __tracedata_start = .; \ 890 KEEP(*(.tracedata)) \ 891 __tracedata_end = .; \ 892 } 893 #else 894 #define TRACEDATA 895 #endif 896 897 #define NOTES \ 898 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 899 __start_notes = .; \ 900 KEEP(*(.note.*)) \ 901 __stop_notes = .; \ 902 } NOTES_HEADERS \ 903 NOTES_HEADERS_RESTORE 904 905 #define INIT_SETUP(initsetup_align) \ 906 . = ALIGN(initsetup_align); \ 907 __setup_start = .; \ 908 KEEP(*(.init.setup)) \ 909 __setup_end = .; 910 911 #define INIT_CALLS_LEVEL(level) \ 912 __initcall##level##_start = .; \ 913 KEEP(*(.initcall##level##.init)) \ 914 KEEP(*(.initcall##level##s.init)) \ 915 916 #define INIT_CALLS \ 917 __initcall_start = .; \ 918 KEEP(*(.initcallearly.init)) \ 919 INIT_CALLS_LEVEL(0) \ 920 INIT_CALLS_LEVEL(1) \ 921 INIT_CALLS_LEVEL(2) \ 922 INIT_CALLS_LEVEL(3) \ 923 INIT_CALLS_LEVEL(4) \ 924 INIT_CALLS_LEVEL(5) \ 925 INIT_CALLS_LEVEL(rootfs) \ 926 INIT_CALLS_LEVEL(6) \ 927 INIT_CALLS_LEVEL(7) \ 928 __initcall_end = .; 929 930 #define CON_INITCALL \ 931 __con_initcall_start = .; \ 932 KEEP(*(.con_initcall.init)) \ 933 __con_initcall_end = .; 934 935 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */ 936 #define KUNIT_TABLE() \ 937 . = ALIGN(8); \ 938 __kunit_suites_start = .; \ 939 KEEP(*(.kunit_test_suites)) \ 940 __kunit_suites_end = .; 941 942 #ifdef CONFIG_BLK_DEV_INITRD 943 #define INIT_RAM_FS \ 944 . = ALIGN(4); \ 945 __initramfs_start = .; \ 946 KEEP(*(.init.ramfs)) \ 947 . = ALIGN(8); \ 948 KEEP(*(.init.ramfs.info)) 949 #else 950 #define INIT_RAM_FS 951 #endif 952 953 /* 954 * Memory encryption operates on a page basis. Since we need to clear 955 * the memory encryption mask for this section, it needs to be aligned 956 * on a page boundary and be a page-size multiple in length. 957 * 958 * Note: We use a separate section so that only this section gets 959 * decrypted to avoid exposing more than we wish. 960 */ 961 #ifdef CONFIG_AMD_MEM_ENCRYPT 962 #define PERCPU_DECRYPTED_SECTION \ 963 . = ALIGN(PAGE_SIZE); \ 964 *(.data..decrypted) \ 965 *(.data..percpu..decrypted) \ 966 . = ALIGN(PAGE_SIZE); 967 #else 968 #define PERCPU_DECRYPTED_SECTION 969 #endif 970 971 972 /* 973 * Default discarded sections. 974 * 975 * Some archs want to discard exit text/data at runtime rather than 976 * link time due to cross-section references such as alt instructions, 977 * bug table, eh_frame, etc. DISCARDS must be the last of output 978 * section definitions so that such archs put those in earlier section 979 * definitions. 980 */ 981 #ifdef RUNTIME_DISCARD_EXIT 982 #define EXIT_DISCARDS 983 #else 984 #define EXIT_DISCARDS \ 985 EXIT_TEXT \ 986 EXIT_DATA 987 #endif 988 989 /* 990 * Clang's -fprofile-arcs, -fsanitize=kernel-address, and 991 * -fsanitize=thread produce unwanted sections (.eh_frame 992 * and .init_array.*), but CONFIG_CONSTRUCTORS wants to 993 * keep any .init_array.* sections. 994 * https://bugs.llvm.org/show_bug.cgi?id=46478 995 */ 996 #if defined(CONFIG_GCOV_KERNEL) || defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN) || \ 997 defined(CONFIG_CFI_CLANG) 998 # ifdef CONFIG_CONSTRUCTORS 999 # define SANITIZER_DISCARDS \ 1000 *(.eh_frame) 1001 # else 1002 # define SANITIZER_DISCARDS \ 1003 *(.init_array) *(.init_array.*) \ 1004 *(.eh_frame) 1005 # endif 1006 #else 1007 # define SANITIZER_DISCARDS 1008 #endif 1009 1010 #define COMMON_DISCARDS \ 1011 SANITIZER_DISCARDS \ 1012 *(.discard) \ 1013 *(.discard.*) \ 1014 *(.modinfo) \ 1015 /* ld.bfd warns about .gnu.version* even when not emitted */ \ 1016 *(.gnu.version*) \ 1017 1018 #define DISCARDS \ 1019 /DISCARD/ : { \ 1020 EXIT_DISCARDS \ 1021 EXIT_CALL \ 1022 COMMON_DISCARDS \ 1023 } 1024 1025 /** 1026 * PERCPU_INPUT - the percpu input sections 1027 * @cacheline: cacheline size 1028 * 1029 * The core percpu section names and core symbols which do not rely 1030 * directly upon load addresses. 1031 * 1032 * @cacheline is used to align subsections to avoid false cacheline 1033 * sharing between subsections for different purposes. 1034 */ 1035 #define PERCPU_INPUT(cacheline) \ 1036 __per_cpu_start = .; \ 1037 *(.data..percpu..first) \ 1038 . = ALIGN(PAGE_SIZE); \ 1039 *(.data..percpu..page_aligned) \ 1040 . = ALIGN(cacheline); \ 1041 *(.data..percpu..read_mostly) \ 1042 . = ALIGN(cacheline); \ 1043 *(.data..percpu) \ 1044 *(.data..percpu..shared_aligned) \ 1045 PERCPU_DECRYPTED_SECTION \ 1046 __per_cpu_end = .; 1047 1048 /** 1049 * PERCPU_VADDR - define output section for percpu area 1050 * @cacheline: cacheline size 1051 * @vaddr: explicit base address (optional) 1052 * @phdr: destination PHDR (optional) 1053 * 1054 * Macro which expands to output section for percpu area. 1055 * 1056 * @cacheline is used to align subsections to avoid false cacheline 1057 * sharing between subsections for different purposes. 1058 * 1059 * If @vaddr is not blank, it specifies explicit base address and all 1060 * percpu symbols will be offset from the given address. If blank, 1061 * @vaddr always equals @laddr + LOAD_OFFSET. 1062 * 1063 * @phdr defines the output PHDR to use if not blank. Be warned that 1064 * output PHDR is sticky. If @phdr is specified, the next output 1065 * section in the linker script will go there too. @phdr should have 1066 * a leading colon. 1067 * 1068 * Note that this macros defines __per_cpu_load as an absolute symbol. 1069 * If there is no need to put the percpu section at a predetermined 1070 * address, use PERCPU_SECTION. 1071 */ 1072 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 1073 __per_cpu_load = .; \ 1074 .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \ 1075 PERCPU_INPUT(cacheline) \ 1076 } phdr \ 1077 . = __per_cpu_load + SIZEOF(.data..percpu); 1078 1079 /** 1080 * PERCPU_SECTION - define output section for percpu area, simple version 1081 * @cacheline: cacheline size 1082 * 1083 * Align to PAGE_SIZE and outputs output section for percpu area. This 1084 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 1085 * __per_cpu_start will be identical. 1086 * 1087 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 1088 * except that __per_cpu_load is defined as a relative symbol against 1089 * .data..percpu which is required for relocatable x86_32 configuration. 1090 */ 1091 #define PERCPU_SECTION(cacheline) \ 1092 . = ALIGN(PAGE_SIZE); \ 1093 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 1094 __per_cpu_load = .; \ 1095 PERCPU_INPUT(cacheline) \ 1096 } 1097 1098 1099 /* 1100 * Definition of the high level *_SECTION macros 1101 * They will fit only a subset of the architectures 1102 */ 1103 1104 1105 /* 1106 * Writeable data. 1107 * All sections are combined in a single .data section. 1108 * The sections following CONSTRUCTORS are arranged so their 1109 * typical alignment matches. 1110 * A cacheline is typical/always less than a PAGE_SIZE so 1111 * the sections that has this restriction (or similar) 1112 * is located before the ones requiring PAGE_SIZE alignment. 1113 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 1114 * matches the requirement of PAGE_ALIGNED_DATA. 1115 * 1116 * use 0 as page_align if page_aligned data is not used */ 1117 #define RW_DATA(cacheline, pagealigned, inittask) \ 1118 . = ALIGN(PAGE_SIZE); \ 1119 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 1120 INIT_TASK_DATA(inittask) \ 1121 NOSAVE_DATA \ 1122 PAGE_ALIGNED_DATA(pagealigned) \ 1123 CACHELINE_ALIGNED_DATA(cacheline) \ 1124 READ_MOSTLY_DATA(cacheline) \ 1125 DATA_DATA \ 1126 CONSTRUCTORS \ 1127 } \ 1128 BUG_TABLE \ 1129 1130 #define INIT_TEXT_SECTION(inittext_align) \ 1131 . = ALIGN(inittext_align); \ 1132 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 1133 _sinittext = .; \ 1134 INIT_TEXT \ 1135 _einittext = .; \ 1136 } 1137 1138 #define INIT_DATA_SECTION(initsetup_align) \ 1139 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 1140 INIT_DATA \ 1141 INIT_SETUP(initsetup_align) \ 1142 INIT_CALLS \ 1143 CON_INITCALL \ 1144 INIT_RAM_FS \ 1145 } 1146 1147 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 1148 . = ALIGN(sbss_align); \ 1149 __bss_start = .; \ 1150 SBSS(sbss_align) \ 1151 BSS(bss_align) \ 1152 . = ALIGN(stop_align); \ 1153 __bss_stop = .; 1154