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 * RODATA_MAIN is not used because existing code already defines .rodata.x 94 * sections to be brought in with rodata. 95 */ 96 #ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 97 #define TEXT_MAIN .text .text.[0-9a-zA-Z_]* 98 #define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..LPBX* 99 #define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]* 100 #define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]* 101 #define BSS_MAIN .bss .bss.[0-9a-zA-Z_]* 102 #define SBSS_MAIN .sbss .sbss.[0-9a-zA-Z_]* 103 #else 104 #define TEXT_MAIN .text 105 #define DATA_MAIN .data 106 #define SDATA_MAIN .sdata 107 #define RODATA_MAIN .rodata 108 #define BSS_MAIN .bss 109 #define SBSS_MAIN .sbss 110 #endif 111 112 /* 113 * GCC 4.5 and later have a 32 bytes section alignment for structures. 114 * Except GCC 4.9, that feels the need to align on 64 bytes. 115 */ 116 #if __GNUC__ == 4 && __GNUC_MINOR__ == 9 117 #define STRUCT_ALIGNMENT 64 118 #else 119 #define STRUCT_ALIGNMENT 32 120 #endif 121 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT) 122 123 /* 124 * The order of the sched class addresses are important, as they are 125 * used to determine the order of the priority of each sched class in 126 * relation to each other. 127 */ 128 #define SCHED_DATA \ 129 STRUCT_ALIGN(); \ 130 __begin_sched_classes = .; \ 131 *(__idle_sched_class) \ 132 *(__fair_sched_class) \ 133 *(__rt_sched_class) \ 134 *(__dl_sched_class) \ 135 *(__stop_sched_class) \ 136 __end_sched_classes = .; 137 138 /* The actual configuration determine if the init/exit sections 139 * are handled as text/data or they can be discarded (which 140 * often happens at runtime) 141 */ 142 #ifdef CONFIG_HOTPLUG_CPU 143 #define CPU_KEEP(sec) *(.cpu##sec) 144 #define CPU_DISCARD(sec) 145 #else 146 #define CPU_KEEP(sec) 147 #define CPU_DISCARD(sec) *(.cpu##sec) 148 #endif 149 150 #if defined(CONFIG_MEMORY_HOTPLUG) 151 #define MEM_KEEP(sec) *(.mem##sec) 152 #define MEM_DISCARD(sec) 153 #else 154 #define MEM_KEEP(sec) 155 #define MEM_DISCARD(sec) *(.mem##sec) 156 #endif 157 158 #ifdef CONFIG_FTRACE_MCOUNT_RECORD 159 /* 160 * The ftrace call sites are logged to a section whose name depends on the 161 * compiler option used. A given kernel image will only use one, AKA 162 * FTRACE_CALLSITE_SECTION. We capture all of them here to avoid header 163 * dependencies for FTRACE_CALLSITE_SECTION's definition. 164 * 165 * Need to also make ftrace_stub_graph point to ftrace_stub 166 * so that the same stub location may have different protocols 167 * and not mess up with C verifiers. 168 */ 169 #define MCOUNT_REC() . = ALIGN(8); \ 170 __start_mcount_loc = .; \ 171 KEEP(*(__mcount_loc)) \ 172 KEEP(*(__patchable_function_entries)) \ 173 __stop_mcount_loc = .; \ 174 ftrace_stub_graph = ftrace_stub; 175 #else 176 # ifdef CONFIG_FUNCTION_TRACER 177 # define MCOUNT_REC() ftrace_stub_graph = ftrace_stub; 178 # else 179 # define MCOUNT_REC() 180 # endif 181 #endif 182 183 #ifdef CONFIG_TRACE_BRANCH_PROFILING 184 #define LIKELY_PROFILE() __start_annotated_branch_profile = .; \ 185 KEEP(*(_ftrace_annotated_branch)) \ 186 __stop_annotated_branch_profile = .; 187 #else 188 #define LIKELY_PROFILE() 189 #endif 190 191 #ifdef CONFIG_PROFILE_ALL_BRANCHES 192 #define BRANCH_PROFILE() __start_branch_profile = .; \ 193 KEEP(*(_ftrace_branch)) \ 194 __stop_branch_profile = .; 195 #else 196 #define BRANCH_PROFILE() 197 #endif 198 199 #ifdef CONFIG_KPROBES 200 #define KPROBE_BLACKLIST() . = ALIGN(8); \ 201 __start_kprobe_blacklist = .; \ 202 KEEP(*(_kprobe_blacklist)) \ 203 __stop_kprobe_blacklist = .; 204 #else 205 #define KPROBE_BLACKLIST() 206 #endif 207 208 #ifdef CONFIG_FUNCTION_ERROR_INJECTION 209 #define ERROR_INJECT_WHITELIST() STRUCT_ALIGN(); \ 210 __start_error_injection_whitelist = .; \ 211 KEEP(*(_error_injection_whitelist)) \ 212 __stop_error_injection_whitelist = .; 213 #else 214 #define ERROR_INJECT_WHITELIST() 215 #endif 216 217 #ifdef CONFIG_EVENT_TRACING 218 #define FTRACE_EVENTS() . = ALIGN(8); \ 219 __start_ftrace_events = .; \ 220 KEEP(*(_ftrace_events)) \ 221 __stop_ftrace_events = .; \ 222 __start_ftrace_eval_maps = .; \ 223 KEEP(*(_ftrace_eval_map)) \ 224 __stop_ftrace_eval_maps = .; 225 #else 226 #define FTRACE_EVENTS() 227 #endif 228 229 #ifdef CONFIG_TRACING 230 #define TRACE_PRINTKS() __start___trace_bprintk_fmt = .; \ 231 KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \ 232 __stop___trace_bprintk_fmt = .; 233 #define TRACEPOINT_STR() __start___tracepoint_str = .; \ 234 KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \ 235 __stop___tracepoint_str = .; 236 #else 237 #define TRACE_PRINTKS() 238 #define TRACEPOINT_STR() 239 #endif 240 241 #ifdef CONFIG_FTRACE_SYSCALLS 242 #define TRACE_SYSCALLS() . = ALIGN(8); \ 243 __start_syscalls_metadata = .; \ 244 KEEP(*(__syscalls_metadata)) \ 245 __stop_syscalls_metadata = .; 246 #else 247 #define TRACE_SYSCALLS() 248 #endif 249 250 #ifdef CONFIG_BPF_EVENTS 251 #define BPF_RAW_TP() STRUCT_ALIGN(); \ 252 __start__bpf_raw_tp = .; \ 253 KEEP(*(__bpf_raw_tp_map)) \ 254 __stop__bpf_raw_tp = .; 255 #else 256 #define BPF_RAW_TP() 257 #endif 258 259 #ifdef CONFIG_SERIAL_EARLYCON 260 #define EARLYCON_TABLE() . = ALIGN(8); \ 261 __earlycon_table = .; \ 262 KEEP(*(__earlycon_table)) \ 263 __earlycon_table_end = .; 264 #else 265 #define EARLYCON_TABLE() 266 #endif 267 268 #ifdef CONFIG_SECURITY 269 #define LSM_TABLE() . = ALIGN(8); \ 270 __start_lsm_info = .; \ 271 KEEP(*(.lsm_info.init)) \ 272 __end_lsm_info = .; 273 #define EARLY_LSM_TABLE() . = ALIGN(8); \ 274 __start_early_lsm_info = .; \ 275 KEEP(*(.early_lsm_info.init)) \ 276 __end_early_lsm_info = .; 277 #else 278 #define LSM_TABLE() 279 #define EARLY_LSM_TABLE() 280 #endif 281 282 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name) 283 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name) 284 #define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name) 285 #define _OF_TABLE_0(name) 286 #define _OF_TABLE_1(name) \ 287 . = ALIGN(8); \ 288 __##name##_of_table = .; \ 289 KEEP(*(__##name##_of_table)) \ 290 KEEP(*(__##name##_of_table_end)) 291 292 #define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer) 293 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip) 294 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk) 295 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem) 296 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method) 297 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method) 298 299 #ifdef CONFIG_ACPI 300 #define ACPI_PROBE_TABLE(name) \ 301 . = ALIGN(8); \ 302 __##name##_acpi_probe_table = .; \ 303 KEEP(*(__##name##_acpi_probe_table)) \ 304 __##name##_acpi_probe_table_end = .; 305 #else 306 #define ACPI_PROBE_TABLE(name) 307 #endif 308 309 #ifdef CONFIG_THERMAL 310 #define THERMAL_TABLE(name) \ 311 . = ALIGN(8); \ 312 __##name##_thermal_table = .; \ 313 KEEP(*(__##name##_thermal_table)) \ 314 __##name##_thermal_table_end = .; 315 #else 316 #define THERMAL_TABLE(name) 317 #endif 318 319 #ifdef CONFIG_DTPM 320 #define DTPM_TABLE() \ 321 . = ALIGN(8); \ 322 __dtpm_table = .; \ 323 KEEP(*(__dtpm_table)) \ 324 __dtpm_table_end = .; 325 #else 326 #define DTPM_TABLE() 327 #endif 328 329 #define KERNEL_DTB() \ 330 STRUCT_ALIGN(); \ 331 __dtb_start = .; \ 332 KEEP(*(.dtb.init.rodata)) \ 333 __dtb_end = .; 334 335 /* 336 * .data section 337 */ 338 #define DATA_DATA \ 339 *(.xiptext) \ 340 *(DATA_MAIN) \ 341 *(.ref.data) \ 342 *(.data..shared_aligned) /* percpu related */ \ 343 MEM_KEEP(init.data*) \ 344 MEM_KEEP(exit.data*) \ 345 *(.data.unlikely) \ 346 __start_once = .; \ 347 *(.data.once) \ 348 __end_once = .; \ 349 STRUCT_ALIGN(); \ 350 *(__tracepoints) \ 351 /* implement dynamic printk debug */ \ 352 . = ALIGN(8); \ 353 __start___dyndbg = .; \ 354 KEEP(*(__dyndbg)) \ 355 __stop___dyndbg = .; \ 356 LIKELY_PROFILE() \ 357 BRANCH_PROFILE() \ 358 TRACE_PRINTKS() \ 359 BPF_RAW_TP() \ 360 TRACEPOINT_STR() 361 362 /* 363 * Data section helpers 364 */ 365 #define NOSAVE_DATA \ 366 . = ALIGN(PAGE_SIZE); \ 367 __nosave_begin = .; \ 368 *(.data..nosave) \ 369 . = ALIGN(PAGE_SIZE); \ 370 __nosave_end = .; 371 372 #define PAGE_ALIGNED_DATA(page_align) \ 373 . = ALIGN(page_align); \ 374 *(.data..page_aligned) \ 375 . = ALIGN(page_align); 376 377 #define READ_MOSTLY_DATA(align) \ 378 . = ALIGN(align); \ 379 *(.data..read_mostly) \ 380 . = ALIGN(align); 381 382 #define CACHELINE_ALIGNED_DATA(align) \ 383 . = ALIGN(align); \ 384 *(.data..cacheline_aligned) 385 386 #define INIT_TASK_DATA(align) \ 387 . = ALIGN(align); \ 388 __start_init_task = .; \ 389 init_thread_union = .; \ 390 init_stack = .; \ 391 KEEP(*(.data..init_task)) \ 392 KEEP(*(.data..init_thread_info)) \ 393 . = __start_init_task + THREAD_SIZE; \ 394 __end_init_task = .; 395 396 #define JUMP_TABLE_DATA \ 397 . = ALIGN(8); \ 398 __start___jump_table = .; \ 399 KEEP(*(__jump_table)) \ 400 __stop___jump_table = .; 401 402 #define STATIC_CALL_DATA \ 403 . = ALIGN(8); \ 404 __start_static_call_sites = .; \ 405 KEEP(*(.static_call_sites)) \ 406 __stop_static_call_sites = .; \ 407 __start_static_call_tramp_key = .; \ 408 KEEP(*(.static_call_tramp_key)) \ 409 __stop_static_call_tramp_key = .; 410 411 /* 412 * Allow architectures to handle ro_after_init data on their 413 * own by defining an empty RO_AFTER_INIT_DATA. 414 */ 415 #ifndef RO_AFTER_INIT_DATA 416 #define RO_AFTER_INIT_DATA \ 417 . = ALIGN(8); \ 418 __start_ro_after_init = .; \ 419 *(.data..ro_after_init) \ 420 JUMP_TABLE_DATA \ 421 STATIC_CALL_DATA \ 422 __end_ro_after_init = .; 423 #endif 424 425 /* 426 * Read only Data 427 */ 428 #define RO_DATA(align) \ 429 . = ALIGN((align)); \ 430 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 431 __start_rodata = .; \ 432 *(.rodata) *(.rodata.*) \ 433 SCHED_DATA \ 434 RO_AFTER_INIT_DATA /* Read only after init */ \ 435 . = ALIGN(8); \ 436 __start___tracepoints_ptrs = .; \ 437 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \ 438 __stop___tracepoints_ptrs = .; \ 439 *(__tracepoints_strings)/* Tracepoints: strings */ \ 440 } \ 441 \ 442 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 443 *(.rodata1) \ 444 } \ 445 \ 446 /* PCI quirks */ \ 447 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 448 __start_pci_fixups_early = .; \ 449 KEEP(*(.pci_fixup_early)) \ 450 __end_pci_fixups_early = .; \ 451 __start_pci_fixups_header = .; \ 452 KEEP(*(.pci_fixup_header)) \ 453 __end_pci_fixups_header = .; \ 454 __start_pci_fixups_final = .; \ 455 KEEP(*(.pci_fixup_final)) \ 456 __end_pci_fixups_final = .; \ 457 __start_pci_fixups_enable = .; \ 458 KEEP(*(.pci_fixup_enable)) \ 459 __end_pci_fixups_enable = .; \ 460 __start_pci_fixups_resume = .; \ 461 KEEP(*(.pci_fixup_resume)) \ 462 __end_pci_fixups_resume = .; \ 463 __start_pci_fixups_resume_early = .; \ 464 KEEP(*(.pci_fixup_resume_early)) \ 465 __end_pci_fixups_resume_early = .; \ 466 __start_pci_fixups_suspend = .; \ 467 KEEP(*(.pci_fixup_suspend)) \ 468 __end_pci_fixups_suspend = .; \ 469 __start_pci_fixups_suspend_late = .; \ 470 KEEP(*(.pci_fixup_suspend_late)) \ 471 __end_pci_fixups_suspend_late = .; \ 472 } \ 473 \ 474 /* Built-in firmware blobs */ \ 475 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) { \ 476 __start_builtin_fw = .; \ 477 KEEP(*(.builtin_fw)) \ 478 __end_builtin_fw = .; \ 479 } \ 480 \ 481 TRACEDATA \ 482 \ 483 /* Kernel symbol table: Normal symbols */ \ 484 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 485 __start___ksymtab = .; \ 486 KEEP(*(SORT(___ksymtab+*))) \ 487 __stop___ksymtab = .; \ 488 } \ 489 \ 490 /* Kernel symbol table: GPL-only symbols */ \ 491 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 492 __start___ksymtab_gpl = .; \ 493 KEEP(*(SORT(___ksymtab_gpl+*))) \ 494 __stop___ksymtab_gpl = .; \ 495 } \ 496 \ 497 /* Kernel symbol table: Normal unused symbols */ \ 498 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \ 499 __start___ksymtab_unused = .; \ 500 KEEP(*(SORT(___ksymtab_unused+*))) \ 501 __stop___ksymtab_unused = .; \ 502 } \ 503 \ 504 /* Kernel symbol table: GPL-only unused symbols */ \ 505 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \ 506 __start___ksymtab_unused_gpl = .; \ 507 KEEP(*(SORT(___ksymtab_unused_gpl+*))) \ 508 __stop___ksymtab_unused_gpl = .; \ 509 } \ 510 \ 511 /* Kernel symbol table: GPL-future-only symbols */ \ 512 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \ 513 __start___ksymtab_gpl_future = .; \ 514 KEEP(*(SORT(___ksymtab_gpl_future+*))) \ 515 __stop___ksymtab_gpl_future = .; \ 516 } \ 517 \ 518 /* Kernel symbol table: Normal symbols */ \ 519 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 520 __start___kcrctab = .; \ 521 KEEP(*(SORT(___kcrctab+*))) \ 522 __stop___kcrctab = .; \ 523 } \ 524 \ 525 /* Kernel symbol table: GPL-only symbols */ \ 526 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 527 __start___kcrctab_gpl = .; \ 528 KEEP(*(SORT(___kcrctab_gpl+*))) \ 529 __stop___kcrctab_gpl = .; \ 530 } \ 531 \ 532 /* Kernel symbol table: Normal unused symbols */ \ 533 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \ 534 __start___kcrctab_unused = .; \ 535 KEEP(*(SORT(___kcrctab_unused+*))) \ 536 __stop___kcrctab_unused = .; \ 537 } \ 538 \ 539 /* Kernel symbol table: GPL-only unused symbols */ \ 540 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \ 541 __start___kcrctab_unused_gpl = .; \ 542 KEEP(*(SORT(___kcrctab_unused_gpl+*))) \ 543 __stop___kcrctab_unused_gpl = .; \ 544 } \ 545 \ 546 /* Kernel symbol table: GPL-future-only symbols */ \ 547 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \ 548 __start___kcrctab_gpl_future = .; \ 549 KEEP(*(SORT(___kcrctab_gpl_future+*))) \ 550 __stop___kcrctab_gpl_future = .; \ 551 } \ 552 \ 553 /* Kernel symbol table: strings */ \ 554 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 555 *(__ksymtab_strings) \ 556 } \ 557 \ 558 /* __*init sections */ \ 559 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 560 *(.ref.rodata) \ 561 MEM_KEEP(init.rodata) \ 562 MEM_KEEP(exit.rodata) \ 563 } \ 564 \ 565 /* Built-in module parameters. */ \ 566 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 567 __start___param = .; \ 568 KEEP(*(__param)) \ 569 __stop___param = .; \ 570 } \ 571 \ 572 /* Built-in module versions. */ \ 573 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 574 __start___modver = .; \ 575 KEEP(*(__modver)) \ 576 __stop___modver = .; \ 577 } \ 578 \ 579 RO_EXCEPTION_TABLE \ 580 NOTES \ 581 BTF \ 582 \ 583 . = ALIGN((align)); \ 584 __end_rodata = .; 585 586 /* 587 * Non-instrumentable text section 588 */ 589 #define NOINSTR_TEXT \ 590 ALIGN_FUNCTION(); \ 591 __noinstr_text_start = .; \ 592 *(.noinstr.text) \ 593 __noinstr_text_end = .; 594 595 /* 596 * .text section. Map to function alignment to avoid address changes 597 * during second ld run in second ld pass when generating System.map 598 * 599 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead 600 * code elimination is enabled, so these sections should be converted 601 * to use ".." first. 602 */ 603 #define TEXT_TEXT \ 604 ALIGN_FUNCTION(); \ 605 *(.text.hot .text.hot.*) \ 606 *(TEXT_MAIN .text.fixup) \ 607 *(.text.unlikely .text.unlikely.*) \ 608 *(.text.unknown .text.unknown.*) \ 609 NOINSTR_TEXT \ 610 *(.text..refcount) \ 611 *(.ref.text) \ 612 MEM_KEEP(init.text*) \ 613 MEM_KEEP(exit.text*) \ 614 615 616 /* sched.text is aling to function alignment to secure we have same 617 * address even at second ld pass when generating System.map */ 618 #define SCHED_TEXT \ 619 ALIGN_FUNCTION(); \ 620 __sched_text_start = .; \ 621 *(.sched.text) \ 622 __sched_text_end = .; 623 624 /* spinlock.text is aling to function alignment to secure we have same 625 * address even at second ld pass when generating System.map */ 626 #define LOCK_TEXT \ 627 ALIGN_FUNCTION(); \ 628 __lock_text_start = .; \ 629 *(.spinlock.text) \ 630 __lock_text_end = .; 631 632 #define CPUIDLE_TEXT \ 633 ALIGN_FUNCTION(); \ 634 __cpuidle_text_start = .; \ 635 *(.cpuidle.text) \ 636 __cpuidle_text_end = .; 637 638 #define KPROBES_TEXT \ 639 ALIGN_FUNCTION(); \ 640 __kprobes_text_start = .; \ 641 *(.kprobes.text) \ 642 __kprobes_text_end = .; 643 644 #define ENTRY_TEXT \ 645 ALIGN_FUNCTION(); \ 646 __entry_text_start = .; \ 647 *(.entry.text) \ 648 __entry_text_end = .; 649 650 #define IRQENTRY_TEXT \ 651 ALIGN_FUNCTION(); \ 652 __irqentry_text_start = .; \ 653 *(.irqentry.text) \ 654 __irqentry_text_end = .; 655 656 #define SOFTIRQENTRY_TEXT \ 657 ALIGN_FUNCTION(); \ 658 __softirqentry_text_start = .; \ 659 *(.softirqentry.text) \ 660 __softirqentry_text_end = .; 661 662 #define STATIC_CALL_TEXT \ 663 ALIGN_FUNCTION(); \ 664 __static_call_text_start = .; \ 665 *(.static_call.text) \ 666 __static_call_text_end = .; 667 668 /* Section used for early init (in .S files) */ 669 #define HEAD_TEXT KEEP(*(.head.text)) 670 671 #define HEAD_TEXT_SECTION \ 672 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 673 HEAD_TEXT \ 674 } 675 676 /* 677 * Exception table 678 */ 679 #define EXCEPTION_TABLE(align) \ 680 . = ALIGN(align); \ 681 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 682 __start___ex_table = .; \ 683 KEEP(*(__ex_table)) \ 684 __stop___ex_table = .; \ 685 } 686 687 /* 688 * .BTF 689 */ 690 #ifdef CONFIG_DEBUG_INFO_BTF 691 #define BTF \ 692 .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \ 693 __start_BTF = .; \ 694 KEEP(*(.BTF)) \ 695 __stop_BTF = .; \ 696 } \ 697 . = ALIGN(4); \ 698 .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) { \ 699 *(.BTF_ids) \ 700 } 701 #else 702 #define BTF 703 #endif 704 705 /* 706 * Init task 707 */ 708 #define INIT_TASK_DATA_SECTION(align) \ 709 . = ALIGN(align); \ 710 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 711 INIT_TASK_DATA(align) \ 712 } 713 714 #ifdef CONFIG_CONSTRUCTORS 715 #define KERNEL_CTORS() . = ALIGN(8); \ 716 __ctors_start = .; \ 717 KEEP(*(SORT(.ctors.*))) \ 718 KEEP(*(.ctors)) \ 719 KEEP(*(SORT(.init_array.*))) \ 720 KEEP(*(.init_array)) \ 721 __ctors_end = .; 722 #else 723 #define KERNEL_CTORS() 724 #endif 725 726 /* init and exit section handling */ 727 #define INIT_DATA \ 728 KEEP(*(SORT(___kentry+*))) \ 729 *(.init.data init.data.*) \ 730 MEM_DISCARD(init.data*) \ 731 KERNEL_CTORS() \ 732 MCOUNT_REC() \ 733 *(.init.rodata .init.rodata.*) \ 734 FTRACE_EVENTS() \ 735 TRACE_SYSCALLS() \ 736 KPROBE_BLACKLIST() \ 737 ERROR_INJECT_WHITELIST() \ 738 MEM_DISCARD(init.rodata) \ 739 CLK_OF_TABLES() \ 740 RESERVEDMEM_OF_TABLES() \ 741 TIMER_OF_TABLES() \ 742 CPU_METHOD_OF_TABLES() \ 743 CPUIDLE_METHOD_OF_TABLES() \ 744 KERNEL_DTB() \ 745 IRQCHIP_OF_MATCH_TABLE() \ 746 ACPI_PROBE_TABLE(irqchip) \ 747 ACPI_PROBE_TABLE(timer) \ 748 THERMAL_TABLE(governor) \ 749 DTPM_TABLE() \ 750 EARLYCON_TABLE() \ 751 LSM_TABLE() \ 752 EARLY_LSM_TABLE() \ 753 KUNIT_TABLE() 754 755 #define INIT_TEXT \ 756 *(.init.text .init.text.*) \ 757 *(.text.startup) \ 758 MEM_DISCARD(init.text*) 759 760 #define EXIT_DATA \ 761 *(.exit.data .exit.data.*) \ 762 *(.fini_array .fini_array.*) \ 763 *(.dtors .dtors.*) \ 764 MEM_DISCARD(exit.data*) \ 765 MEM_DISCARD(exit.rodata*) 766 767 #define EXIT_TEXT \ 768 *(.exit.text) \ 769 *(.text.exit) \ 770 MEM_DISCARD(exit.text) 771 772 #define EXIT_CALL \ 773 *(.exitcall.exit) 774 775 /* 776 * bss (Block Started by Symbol) - uninitialized data 777 * zeroed during startup 778 */ 779 #define SBSS(sbss_align) \ 780 . = ALIGN(sbss_align); \ 781 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 782 *(.dynsbss) \ 783 *(SBSS_MAIN) \ 784 *(.scommon) \ 785 } 786 787 /* 788 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 789 * sections to the front of bss. 790 */ 791 #ifndef BSS_FIRST_SECTIONS 792 #define BSS_FIRST_SECTIONS 793 #endif 794 795 #define BSS(bss_align) \ 796 . = ALIGN(bss_align); \ 797 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 798 BSS_FIRST_SECTIONS \ 799 . = ALIGN(PAGE_SIZE); \ 800 *(.bss..page_aligned) \ 801 . = ALIGN(PAGE_SIZE); \ 802 *(.dynbss) \ 803 *(BSS_MAIN) \ 804 *(COMMON) \ 805 } 806 807 /* 808 * DWARF debug sections. 809 * Symbols in the DWARF debugging sections are relative to 810 * the beginning of the section so we begin them at 0. 811 */ 812 #define DWARF_DEBUG \ 813 /* DWARF 1 */ \ 814 .debug 0 : { *(.debug) } \ 815 .line 0 : { *(.line) } \ 816 /* GNU DWARF 1 extensions */ \ 817 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 818 .debug_sfnames 0 : { *(.debug_sfnames) } \ 819 /* DWARF 1.1 and DWARF 2 */ \ 820 .debug_aranges 0 : { *(.debug_aranges) } \ 821 .debug_pubnames 0 : { *(.debug_pubnames) } \ 822 /* DWARF 2 */ \ 823 .debug_info 0 : { *(.debug_info \ 824 .gnu.linkonce.wi.*) } \ 825 .debug_abbrev 0 : { *(.debug_abbrev) } \ 826 .debug_line 0 : { *(.debug_line) } \ 827 .debug_frame 0 : { *(.debug_frame) } \ 828 .debug_str 0 : { *(.debug_str) } \ 829 .debug_loc 0 : { *(.debug_loc) } \ 830 .debug_macinfo 0 : { *(.debug_macinfo) } \ 831 .debug_pubtypes 0 : { *(.debug_pubtypes) } \ 832 /* DWARF 3 */ \ 833 .debug_ranges 0 : { *(.debug_ranges) } \ 834 /* SGI/MIPS DWARF 2 extensions */ \ 835 .debug_weaknames 0 : { *(.debug_weaknames) } \ 836 .debug_funcnames 0 : { *(.debug_funcnames) } \ 837 .debug_typenames 0 : { *(.debug_typenames) } \ 838 .debug_varnames 0 : { *(.debug_varnames) } \ 839 /* GNU DWARF 2 extensions */ \ 840 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \ 841 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \ 842 /* DWARF 4 */ \ 843 .debug_types 0 : { *(.debug_types) } \ 844 /* DWARF 5 */ \ 845 .debug_macro 0 : { *(.debug_macro) } \ 846 .debug_addr 0 : { *(.debug_addr) } 847 848 /* Stabs debugging sections. */ 849 #define STABS_DEBUG \ 850 .stab 0 : { *(.stab) } \ 851 .stabstr 0 : { *(.stabstr) } \ 852 .stab.excl 0 : { *(.stab.excl) } \ 853 .stab.exclstr 0 : { *(.stab.exclstr) } \ 854 .stab.index 0 : { *(.stab.index) } \ 855 .stab.indexstr 0 : { *(.stab.indexstr) } 856 857 /* Required sections not related to debugging. */ 858 #define ELF_DETAILS \ 859 .comment 0 : { *(.comment) } \ 860 .symtab 0 : { *(.symtab) } \ 861 .strtab 0 : { *(.strtab) } \ 862 .shstrtab 0 : { *(.shstrtab) } 863 864 #ifdef CONFIG_GENERIC_BUG 865 #define BUG_TABLE \ 866 . = ALIGN(8); \ 867 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 868 __start___bug_table = .; \ 869 KEEP(*(__bug_table)) \ 870 __stop___bug_table = .; \ 871 } 872 #else 873 #define BUG_TABLE 874 #endif 875 876 #ifdef CONFIG_UNWINDER_ORC 877 #define ORC_UNWIND_TABLE \ 878 . = ALIGN(4); \ 879 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \ 880 __start_orc_unwind_ip = .; \ 881 KEEP(*(.orc_unwind_ip)) \ 882 __stop_orc_unwind_ip = .; \ 883 } \ 884 . = ALIGN(2); \ 885 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \ 886 __start_orc_unwind = .; \ 887 KEEP(*(.orc_unwind)) \ 888 __stop_orc_unwind = .; \ 889 } \ 890 . = ALIGN(4); \ 891 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \ 892 orc_lookup = .; \ 893 . += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) / \ 894 LOOKUP_BLOCK_SIZE) + 1) * 4; \ 895 orc_lookup_end = .; \ 896 } 897 #else 898 #define ORC_UNWIND_TABLE 899 #endif 900 901 #ifdef CONFIG_PM_TRACE 902 #define TRACEDATA \ 903 . = ALIGN(4); \ 904 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 905 __tracedata_start = .; \ 906 KEEP(*(.tracedata)) \ 907 __tracedata_end = .; \ 908 } 909 #else 910 #define TRACEDATA 911 #endif 912 913 #define NOTES \ 914 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 915 __start_notes = .; \ 916 KEEP(*(.note.*)) \ 917 __stop_notes = .; \ 918 } NOTES_HEADERS \ 919 NOTES_HEADERS_RESTORE 920 921 #define INIT_SETUP(initsetup_align) \ 922 . = ALIGN(initsetup_align); \ 923 __setup_start = .; \ 924 KEEP(*(.init.setup)) \ 925 __setup_end = .; 926 927 #define INIT_CALLS_LEVEL(level) \ 928 __initcall##level##_start = .; \ 929 KEEP(*(.initcall##level##.init)) \ 930 KEEP(*(.initcall##level##s.init)) \ 931 932 #define INIT_CALLS \ 933 __initcall_start = .; \ 934 KEEP(*(.initcallearly.init)) \ 935 INIT_CALLS_LEVEL(0) \ 936 INIT_CALLS_LEVEL(1) \ 937 INIT_CALLS_LEVEL(2) \ 938 INIT_CALLS_LEVEL(3) \ 939 INIT_CALLS_LEVEL(4) \ 940 INIT_CALLS_LEVEL(5) \ 941 INIT_CALLS_LEVEL(rootfs) \ 942 INIT_CALLS_LEVEL(6) \ 943 INIT_CALLS_LEVEL(7) \ 944 __initcall_end = .; 945 946 #define CON_INITCALL \ 947 __con_initcall_start = .; \ 948 KEEP(*(.con_initcall.init)) \ 949 __con_initcall_end = .; 950 951 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */ 952 #define KUNIT_TABLE() \ 953 . = ALIGN(8); \ 954 __kunit_suites_start = .; \ 955 KEEP(*(.kunit_test_suites)) \ 956 __kunit_suites_end = .; 957 958 #ifdef CONFIG_BLK_DEV_INITRD 959 #define INIT_RAM_FS \ 960 . = ALIGN(4); \ 961 __initramfs_start = .; \ 962 KEEP(*(.init.ramfs)) \ 963 . = ALIGN(8); \ 964 KEEP(*(.init.ramfs.info)) 965 #else 966 #define INIT_RAM_FS 967 #endif 968 969 /* 970 * Memory encryption operates on a page basis. Since we need to clear 971 * the memory encryption mask for this section, it needs to be aligned 972 * on a page boundary and be a page-size multiple in length. 973 * 974 * Note: We use a separate section so that only this section gets 975 * decrypted to avoid exposing more than we wish. 976 */ 977 #ifdef CONFIG_AMD_MEM_ENCRYPT 978 #define PERCPU_DECRYPTED_SECTION \ 979 . = ALIGN(PAGE_SIZE); \ 980 *(.data..percpu..decrypted) \ 981 . = ALIGN(PAGE_SIZE); 982 #else 983 #define PERCPU_DECRYPTED_SECTION 984 #endif 985 986 987 /* 988 * Default discarded sections. 989 * 990 * Some archs want to discard exit text/data at runtime rather than 991 * link time due to cross-section references such as alt instructions, 992 * bug table, eh_frame, etc. DISCARDS must be the last of output 993 * section definitions so that such archs put those in earlier section 994 * definitions. 995 */ 996 #ifdef RUNTIME_DISCARD_EXIT 997 #define EXIT_DISCARDS 998 #else 999 #define EXIT_DISCARDS \ 1000 EXIT_TEXT \ 1001 EXIT_DATA 1002 #endif 1003 1004 /* 1005 * Clang's -fsanitize=kernel-address and -fsanitize=thread produce 1006 * unwanted sections (.eh_frame and .init_array.*), but 1007 * CONFIG_CONSTRUCTORS wants to keep any .init_array.* sections. 1008 * https://bugs.llvm.org/show_bug.cgi?id=46478 1009 */ 1010 #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN) 1011 # ifdef CONFIG_CONSTRUCTORS 1012 # define SANITIZER_DISCARDS \ 1013 *(.eh_frame) 1014 # else 1015 # define SANITIZER_DISCARDS \ 1016 *(.init_array) *(.init_array.*) \ 1017 *(.eh_frame) 1018 # endif 1019 #else 1020 # define SANITIZER_DISCARDS 1021 #endif 1022 1023 #define COMMON_DISCARDS \ 1024 SANITIZER_DISCARDS \ 1025 *(.discard) \ 1026 *(.discard.*) \ 1027 *(.modinfo) \ 1028 /* ld.bfd warns about .gnu.version* even when not emitted */ \ 1029 *(.gnu.version*) \ 1030 1031 #define DISCARDS \ 1032 /DISCARD/ : { \ 1033 EXIT_DISCARDS \ 1034 EXIT_CALL \ 1035 COMMON_DISCARDS \ 1036 } 1037 1038 /** 1039 * PERCPU_INPUT - the percpu input sections 1040 * @cacheline: cacheline size 1041 * 1042 * The core percpu section names and core symbols which do not rely 1043 * directly upon load addresses. 1044 * 1045 * @cacheline is used to align subsections to avoid false cacheline 1046 * sharing between subsections for different purposes. 1047 */ 1048 #define PERCPU_INPUT(cacheline) \ 1049 __per_cpu_start = .; \ 1050 *(.data..percpu..first) \ 1051 . = ALIGN(PAGE_SIZE); \ 1052 *(.data..percpu..page_aligned) \ 1053 . = ALIGN(cacheline); \ 1054 *(.data..percpu..read_mostly) \ 1055 . = ALIGN(cacheline); \ 1056 *(.data..percpu) \ 1057 *(.data..percpu..shared_aligned) \ 1058 PERCPU_DECRYPTED_SECTION \ 1059 __per_cpu_end = .; 1060 1061 /** 1062 * PERCPU_VADDR - define output section for percpu area 1063 * @cacheline: cacheline size 1064 * @vaddr: explicit base address (optional) 1065 * @phdr: destination PHDR (optional) 1066 * 1067 * Macro which expands to output section for percpu area. 1068 * 1069 * @cacheline is used to align subsections to avoid false cacheline 1070 * sharing between subsections for different purposes. 1071 * 1072 * If @vaddr is not blank, it specifies explicit base address and all 1073 * percpu symbols will be offset from the given address. If blank, 1074 * @vaddr always equals @laddr + LOAD_OFFSET. 1075 * 1076 * @phdr defines the output PHDR to use if not blank. Be warned that 1077 * output PHDR is sticky. If @phdr is specified, the next output 1078 * section in the linker script will go there too. @phdr should have 1079 * a leading colon. 1080 * 1081 * Note that this macros defines __per_cpu_load as an absolute symbol. 1082 * If there is no need to put the percpu section at a predetermined 1083 * address, use PERCPU_SECTION. 1084 */ 1085 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 1086 __per_cpu_load = .; \ 1087 .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \ 1088 PERCPU_INPUT(cacheline) \ 1089 } phdr \ 1090 . = __per_cpu_load + SIZEOF(.data..percpu); 1091 1092 /** 1093 * PERCPU_SECTION - define output section for percpu area, simple version 1094 * @cacheline: cacheline size 1095 * 1096 * Align to PAGE_SIZE and outputs output section for percpu area. This 1097 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 1098 * __per_cpu_start will be identical. 1099 * 1100 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 1101 * except that __per_cpu_load is defined as a relative symbol against 1102 * .data..percpu which is required for relocatable x86_32 configuration. 1103 */ 1104 #define PERCPU_SECTION(cacheline) \ 1105 . = ALIGN(PAGE_SIZE); \ 1106 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 1107 __per_cpu_load = .; \ 1108 PERCPU_INPUT(cacheline) \ 1109 } 1110 1111 1112 /* 1113 * Definition of the high level *_SECTION macros 1114 * They will fit only a subset of the architectures 1115 */ 1116 1117 1118 /* 1119 * Writeable data. 1120 * All sections are combined in a single .data section. 1121 * The sections following CONSTRUCTORS are arranged so their 1122 * typical alignment matches. 1123 * A cacheline is typical/always less than a PAGE_SIZE so 1124 * the sections that has this restriction (or similar) 1125 * is located before the ones requiring PAGE_SIZE alignment. 1126 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 1127 * matches the requirement of PAGE_ALIGNED_DATA. 1128 * 1129 * use 0 as page_align if page_aligned data is not used */ 1130 #define RW_DATA(cacheline, pagealigned, inittask) \ 1131 . = ALIGN(PAGE_SIZE); \ 1132 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 1133 INIT_TASK_DATA(inittask) \ 1134 NOSAVE_DATA \ 1135 PAGE_ALIGNED_DATA(pagealigned) \ 1136 CACHELINE_ALIGNED_DATA(cacheline) \ 1137 READ_MOSTLY_DATA(cacheline) \ 1138 DATA_DATA \ 1139 CONSTRUCTORS \ 1140 } \ 1141 BUG_TABLE \ 1142 1143 #define INIT_TEXT_SECTION(inittext_align) \ 1144 . = ALIGN(inittext_align); \ 1145 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 1146 _sinittext = .; \ 1147 INIT_TEXT \ 1148 _einittext = .; \ 1149 } 1150 1151 #define INIT_DATA_SECTION(initsetup_align) \ 1152 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 1153 INIT_DATA \ 1154 INIT_SETUP(initsetup_align) \ 1155 INIT_CALLS \ 1156 CON_INITCALL \ 1157 INIT_RAM_FS \ 1158 } 1159 1160 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 1161 . = ALIGN(sbss_align); \ 1162 __bss_start = .; \ 1163 SBSS(sbss_align) \ 1164 BSS(bss_align) \ 1165 . = ALIGN(stop_align); \ 1166 __bss_stop = .; 1167