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 #define KERNEL_DTB() \ 320 STRUCT_ALIGN(); \ 321 __dtb_start = .; \ 322 KEEP(*(.dtb.init.rodata)) \ 323 __dtb_end = .; 324 325 /* 326 * .data section 327 */ 328 #define DATA_DATA \ 329 *(.xiptext) \ 330 *(DATA_MAIN) \ 331 *(.ref.data) \ 332 *(.data..shared_aligned) /* percpu related */ \ 333 MEM_KEEP(init.data*) \ 334 MEM_KEEP(exit.data*) \ 335 *(.data.unlikely) \ 336 __start_once = .; \ 337 *(.data.once) \ 338 __end_once = .; \ 339 STRUCT_ALIGN(); \ 340 *(__tracepoints) \ 341 /* implement dynamic printk debug */ \ 342 . = ALIGN(8); \ 343 __start___dyndbg = .; \ 344 KEEP(*(__dyndbg)) \ 345 __stop___dyndbg = .; \ 346 LIKELY_PROFILE() \ 347 BRANCH_PROFILE() \ 348 TRACE_PRINTKS() \ 349 BPF_RAW_TP() \ 350 TRACEPOINT_STR() 351 352 /* 353 * Data section helpers 354 */ 355 #define NOSAVE_DATA \ 356 . = ALIGN(PAGE_SIZE); \ 357 __nosave_begin = .; \ 358 *(.data..nosave) \ 359 . = ALIGN(PAGE_SIZE); \ 360 __nosave_end = .; 361 362 #define PAGE_ALIGNED_DATA(page_align) \ 363 . = ALIGN(page_align); \ 364 *(.data..page_aligned) \ 365 . = ALIGN(page_align); 366 367 #define READ_MOSTLY_DATA(align) \ 368 . = ALIGN(align); \ 369 *(.data..read_mostly) \ 370 . = ALIGN(align); 371 372 #define CACHELINE_ALIGNED_DATA(align) \ 373 . = ALIGN(align); \ 374 *(.data..cacheline_aligned) 375 376 #define INIT_TASK_DATA(align) \ 377 . = ALIGN(align); \ 378 __start_init_task = .; \ 379 init_thread_union = .; \ 380 init_stack = .; \ 381 KEEP(*(.data..init_task)) \ 382 KEEP(*(.data..init_thread_info)) \ 383 . = __start_init_task + THREAD_SIZE; \ 384 __end_init_task = .; 385 386 #define JUMP_TABLE_DATA \ 387 . = ALIGN(8); \ 388 __start___jump_table = .; \ 389 KEEP(*(__jump_table)) \ 390 __stop___jump_table = .; 391 392 #define STATIC_CALL_DATA \ 393 . = ALIGN(8); \ 394 __start_static_call_sites = .; \ 395 KEEP(*(.static_call_sites)) \ 396 __stop_static_call_sites = .; 397 398 /* 399 * Allow architectures to handle ro_after_init data on their 400 * own by defining an empty RO_AFTER_INIT_DATA. 401 */ 402 #ifndef RO_AFTER_INIT_DATA 403 #define RO_AFTER_INIT_DATA \ 404 . = ALIGN(8); \ 405 __start_ro_after_init = .; \ 406 *(.data..ro_after_init) \ 407 JUMP_TABLE_DATA \ 408 STATIC_CALL_DATA \ 409 __end_ro_after_init = .; 410 #endif 411 412 /* 413 * Read only Data 414 */ 415 #define RO_DATA(align) \ 416 . = ALIGN((align)); \ 417 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 418 __start_rodata = .; \ 419 *(.rodata) *(.rodata.*) \ 420 SCHED_DATA \ 421 RO_AFTER_INIT_DATA /* Read only after init */ \ 422 . = ALIGN(8); \ 423 __start___tracepoints_ptrs = .; \ 424 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \ 425 __stop___tracepoints_ptrs = .; \ 426 *(__tracepoints_strings)/* Tracepoints: strings */ \ 427 } \ 428 \ 429 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 430 *(.rodata1) \ 431 } \ 432 \ 433 /* PCI quirks */ \ 434 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 435 __start_pci_fixups_early = .; \ 436 KEEP(*(.pci_fixup_early)) \ 437 __end_pci_fixups_early = .; \ 438 __start_pci_fixups_header = .; \ 439 KEEP(*(.pci_fixup_header)) \ 440 __end_pci_fixups_header = .; \ 441 __start_pci_fixups_final = .; \ 442 KEEP(*(.pci_fixup_final)) \ 443 __end_pci_fixups_final = .; \ 444 __start_pci_fixups_enable = .; \ 445 KEEP(*(.pci_fixup_enable)) \ 446 __end_pci_fixups_enable = .; \ 447 __start_pci_fixups_resume = .; \ 448 KEEP(*(.pci_fixup_resume)) \ 449 __end_pci_fixups_resume = .; \ 450 __start_pci_fixups_resume_early = .; \ 451 KEEP(*(.pci_fixup_resume_early)) \ 452 __end_pci_fixups_resume_early = .; \ 453 __start_pci_fixups_suspend = .; \ 454 KEEP(*(.pci_fixup_suspend)) \ 455 __end_pci_fixups_suspend = .; \ 456 __start_pci_fixups_suspend_late = .; \ 457 KEEP(*(.pci_fixup_suspend_late)) \ 458 __end_pci_fixups_suspend_late = .; \ 459 } \ 460 \ 461 /* Built-in firmware blobs */ \ 462 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \ 463 __start_builtin_fw = .; \ 464 KEEP(*(.builtin_fw)) \ 465 __end_builtin_fw = .; \ 466 } \ 467 \ 468 TRACEDATA \ 469 \ 470 /* Kernel symbol table: Normal symbols */ \ 471 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 472 __start___ksymtab = .; \ 473 KEEP(*(SORT(___ksymtab+*))) \ 474 __stop___ksymtab = .; \ 475 } \ 476 \ 477 /* Kernel symbol table: GPL-only symbols */ \ 478 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 479 __start___ksymtab_gpl = .; \ 480 KEEP(*(SORT(___ksymtab_gpl+*))) \ 481 __stop___ksymtab_gpl = .; \ 482 } \ 483 \ 484 /* Kernel symbol table: Normal unused symbols */ \ 485 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \ 486 __start___ksymtab_unused = .; \ 487 KEEP(*(SORT(___ksymtab_unused+*))) \ 488 __stop___ksymtab_unused = .; \ 489 } \ 490 \ 491 /* Kernel symbol table: GPL-only unused symbols */ \ 492 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \ 493 __start___ksymtab_unused_gpl = .; \ 494 KEEP(*(SORT(___ksymtab_unused_gpl+*))) \ 495 __stop___ksymtab_unused_gpl = .; \ 496 } \ 497 \ 498 /* Kernel symbol table: GPL-future-only symbols */ \ 499 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \ 500 __start___ksymtab_gpl_future = .; \ 501 KEEP(*(SORT(___ksymtab_gpl_future+*))) \ 502 __stop___ksymtab_gpl_future = .; \ 503 } \ 504 \ 505 /* Kernel symbol table: Normal symbols */ \ 506 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 507 __start___kcrctab = .; \ 508 KEEP(*(SORT(___kcrctab+*))) \ 509 __stop___kcrctab = .; \ 510 } \ 511 \ 512 /* Kernel symbol table: GPL-only symbols */ \ 513 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 514 __start___kcrctab_gpl = .; \ 515 KEEP(*(SORT(___kcrctab_gpl+*))) \ 516 __stop___kcrctab_gpl = .; \ 517 } \ 518 \ 519 /* Kernel symbol table: Normal unused symbols */ \ 520 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \ 521 __start___kcrctab_unused = .; \ 522 KEEP(*(SORT(___kcrctab_unused+*))) \ 523 __stop___kcrctab_unused = .; \ 524 } \ 525 \ 526 /* Kernel symbol table: GPL-only unused symbols */ \ 527 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \ 528 __start___kcrctab_unused_gpl = .; \ 529 KEEP(*(SORT(___kcrctab_unused_gpl+*))) \ 530 __stop___kcrctab_unused_gpl = .; \ 531 } \ 532 \ 533 /* Kernel symbol table: GPL-future-only symbols */ \ 534 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \ 535 __start___kcrctab_gpl_future = .; \ 536 KEEP(*(SORT(___kcrctab_gpl_future+*))) \ 537 __stop___kcrctab_gpl_future = .; \ 538 } \ 539 \ 540 /* Kernel symbol table: strings */ \ 541 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 542 *(__ksymtab_strings) \ 543 } \ 544 \ 545 /* __*init sections */ \ 546 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 547 *(.ref.rodata) \ 548 MEM_KEEP(init.rodata) \ 549 MEM_KEEP(exit.rodata) \ 550 } \ 551 \ 552 /* Built-in module parameters. */ \ 553 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 554 __start___param = .; \ 555 KEEP(*(__param)) \ 556 __stop___param = .; \ 557 } \ 558 \ 559 /* Built-in module versions. */ \ 560 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 561 __start___modver = .; \ 562 KEEP(*(__modver)) \ 563 __stop___modver = .; \ 564 } \ 565 \ 566 RO_EXCEPTION_TABLE \ 567 NOTES \ 568 BTF \ 569 \ 570 . = ALIGN((align)); \ 571 __end_rodata = .; 572 573 /* 574 * Non-instrumentable text section 575 */ 576 #define NOINSTR_TEXT \ 577 ALIGN_FUNCTION(); \ 578 __noinstr_text_start = .; \ 579 *(.noinstr.text) \ 580 __noinstr_text_end = .; 581 582 /* 583 * .text section. Map to function alignment to avoid address changes 584 * during second ld run in second ld pass when generating System.map 585 * 586 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead 587 * code elimination is enabled, so these sections should be converted 588 * to use ".." first. 589 */ 590 #define TEXT_TEXT \ 591 ALIGN_FUNCTION(); \ 592 *(.text.hot .text.hot.*) \ 593 *(TEXT_MAIN .text.fixup) \ 594 *(.text.unlikely .text.unlikely.*) \ 595 *(.text.unknown .text.unknown.*) \ 596 NOINSTR_TEXT \ 597 *(.text..refcount) \ 598 *(.ref.text) \ 599 MEM_KEEP(init.text*) \ 600 MEM_KEEP(exit.text*) \ 601 602 603 /* sched.text is aling to function alignment to secure we have same 604 * address even at second ld pass when generating System.map */ 605 #define SCHED_TEXT \ 606 ALIGN_FUNCTION(); \ 607 __sched_text_start = .; \ 608 *(.sched.text) \ 609 __sched_text_end = .; 610 611 /* spinlock.text is aling to function alignment to secure we have same 612 * address even at second ld pass when generating System.map */ 613 #define LOCK_TEXT \ 614 ALIGN_FUNCTION(); \ 615 __lock_text_start = .; \ 616 *(.spinlock.text) \ 617 __lock_text_end = .; 618 619 #define CPUIDLE_TEXT \ 620 ALIGN_FUNCTION(); \ 621 __cpuidle_text_start = .; \ 622 *(.cpuidle.text) \ 623 __cpuidle_text_end = .; 624 625 #define KPROBES_TEXT \ 626 ALIGN_FUNCTION(); \ 627 __kprobes_text_start = .; \ 628 *(.kprobes.text) \ 629 __kprobes_text_end = .; 630 631 #define ENTRY_TEXT \ 632 ALIGN_FUNCTION(); \ 633 __entry_text_start = .; \ 634 *(.entry.text) \ 635 __entry_text_end = .; 636 637 #define IRQENTRY_TEXT \ 638 ALIGN_FUNCTION(); \ 639 __irqentry_text_start = .; \ 640 *(.irqentry.text) \ 641 __irqentry_text_end = .; 642 643 #define SOFTIRQENTRY_TEXT \ 644 ALIGN_FUNCTION(); \ 645 __softirqentry_text_start = .; \ 646 *(.softirqentry.text) \ 647 __softirqentry_text_end = .; 648 649 #define STATIC_CALL_TEXT \ 650 ALIGN_FUNCTION(); \ 651 __static_call_text_start = .; \ 652 *(.static_call.text) \ 653 __static_call_text_end = .; 654 655 /* Section used for early init (in .S files) */ 656 #define HEAD_TEXT KEEP(*(.head.text)) 657 658 #define HEAD_TEXT_SECTION \ 659 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 660 HEAD_TEXT \ 661 } 662 663 /* 664 * Exception table 665 */ 666 #define EXCEPTION_TABLE(align) \ 667 . = ALIGN(align); \ 668 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 669 __start___ex_table = .; \ 670 KEEP(*(__ex_table)) \ 671 __stop___ex_table = .; \ 672 } 673 674 /* 675 * .BTF 676 */ 677 #ifdef CONFIG_DEBUG_INFO_BTF 678 #define BTF \ 679 .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \ 680 __start_BTF = .; \ 681 KEEP(*(.BTF)) \ 682 __stop_BTF = .; \ 683 } \ 684 . = ALIGN(4); \ 685 .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) { \ 686 *(.BTF_ids) \ 687 } 688 #else 689 #define BTF 690 #endif 691 692 /* 693 * Init task 694 */ 695 #define INIT_TASK_DATA_SECTION(align) \ 696 . = ALIGN(align); \ 697 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 698 INIT_TASK_DATA(align) \ 699 } 700 701 #ifdef CONFIG_CONSTRUCTORS 702 #define KERNEL_CTORS() . = ALIGN(8); \ 703 __ctors_start = .; \ 704 KEEP(*(.ctors)) \ 705 KEEP(*(SORT(.init_array.*))) \ 706 KEEP(*(.init_array)) \ 707 __ctors_end = .; 708 #else 709 #define KERNEL_CTORS() 710 #endif 711 712 /* init and exit section handling */ 713 #define INIT_DATA \ 714 KEEP(*(SORT(___kentry+*))) \ 715 *(.init.data init.data.*) \ 716 MEM_DISCARD(init.data*) \ 717 KERNEL_CTORS() \ 718 MCOUNT_REC() \ 719 *(.init.rodata .init.rodata.*) \ 720 FTRACE_EVENTS() \ 721 TRACE_SYSCALLS() \ 722 KPROBE_BLACKLIST() \ 723 ERROR_INJECT_WHITELIST() \ 724 MEM_DISCARD(init.rodata) \ 725 CLK_OF_TABLES() \ 726 RESERVEDMEM_OF_TABLES() \ 727 TIMER_OF_TABLES() \ 728 CPU_METHOD_OF_TABLES() \ 729 CPUIDLE_METHOD_OF_TABLES() \ 730 KERNEL_DTB() \ 731 IRQCHIP_OF_MATCH_TABLE() \ 732 ACPI_PROBE_TABLE(irqchip) \ 733 ACPI_PROBE_TABLE(timer) \ 734 THERMAL_TABLE(governor) \ 735 EARLYCON_TABLE() \ 736 LSM_TABLE() \ 737 EARLY_LSM_TABLE() \ 738 KUNIT_TABLE() 739 740 #define INIT_TEXT \ 741 *(.init.text .init.text.*) \ 742 *(.text.startup) \ 743 MEM_DISCARD(init.text*) 744 745 #define EXIT_DATA \ 746 *(.exit.data .exit.data.*) \ 747 *(.fini_array .fini_array.*) \ 748 *(.dtors .dtors.*) \ 749 MEM_DISCARD(exit.data*) \ 750 MEM_DISCARD(exit.rodata*) 751 752 #define EXIT_TEXT \ 753 *(.exit.text) \ 754 *(.text.exit) \ 755 MEM_DISCARD(exit.text) 756 757 #define EXIT_CALL \ 758 *(.exitcall.exit) 759 760 /* 761 * bss (Block Started by Symbol) - uninitialized data 762 * zeroed during startup 763 */ 764 #define SBSS(sbss_align) \ 765 . = ALIGN(sbss_align); \ 766 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 767 *(.dynsbss) \ 768 *(SBSS_MAIN) \ 769 *(.scommon) \ 770 } 771 772 /* 773 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 774 * sections to the front of bss. 775 */ 776 #ifndef BSS_FIRST_SECTIONS 777 #define BSS_FIRST_SECTIONS 778 #endif 779 780 #define BSS(bss_align) \ 781 . = ALIGN(bss_align); \ 782 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 783 BSS_FIRST_SECTIONS \ 784 . = ALIGN(PAGE_SIZE); \ 785 *(.bss..page_aligned) \ 786 . = ALIGN(PAGE_SIZE); \ 787 *(.dynbss) \ 788 *(BSS_MAIN) \ 789 *(COMMON) \ 790 } 791 792 /* 793 * DWARF debug sections. 794 * Symbols in the DWARF debugging sections are relative to 795 * the beginning of the section so we begin them at 0. 796 */ 797 #define DWARF_DEBUG \ 798 /* DWARF 1 */ \ 799 .debug 0 : { *(.debug) } \ 800 .line 0 : { *(.line) } \ 801 /* GNU DWARF 1 extensions */ \ 802 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 803 .debug_sfnames 0 : { *(.debug_sfnames) } \ 804 /* DWARF 1.1 and DWARF 2 */ \ 805 .debug_aranges 0 : { *(.debug_aranges) } \ 806 .debug_pubnames 0 : { *(.debug_pubnames) } \ 807 /* DWARF 2 */ \ 808 .debug_info 0 : { *(.debug_info \ 809 .gnu.linkonce.wi.*) } \ 810 .debug_abbrev 0 : { *(.debug_abbrev) } \ 811 .debug_line 0 : { *(.debug_line) } \ 812 .debug_frame 0 : { *(.debug_frame) } \ 813 .debug_str 0 : { *(.debug_str) } \ 814 .debug_loc 0 : { *(.debug_loc) } \ 815 .debug_macinfo 0 : { *(.debug_macinfo) } \ 816 .debug_pubtypes 0 : { *(.debug_pubtypes) } \ 817 /* DWARF 3 */ \ 818 .debug_ranges 0 : { *(.debug_ranges) } \ 819 /* SGI/MIPS DWARF 2 extensions */ \ 820 .debug_weaknames 0 : { *(.debug_weaknames) } \ 821 .debug_funcnames 0 : { *(.debug_funcnames) } \ 822 .debug_typenames 0 : { *(.debug_typenames) } \ 823 .debug_varnames 0 : { *(.debug_varnames) } \ 824 /* GNU DWARF 2 extensions */ \ 825 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \ 826 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \ 827 /* DWARF 4 */ \ 828 .debug_types 0 : { *(.debug_types) } \ 829 /* DWARF 5 */ \ 830 .debug_macro 0 : { *(.debug_macro) } \ 831 .debug_addr 0 : { *(.debug_addr) } 832 833 /* Stabs debugging sections. */ 834 #define STABS_DEBUG \ 835 .stab 0 : { *(.stab) } \ 836 .stabstr 0 : { *(.stabstr) } \ 837 .stab.excl 0 : { *(.stab.excl) } \ 838 .stab.exclstr 0 : { *(.stab.exclstr) } \ 839 .stab.index 0 : { *(.stab.index) } \ 840 .stab.indexstr 0 : { *(.stab.indexstr) } 841 842 /* Required sections not related to debugging. */ 843 #define ELF_DETAILS \ 844 .comment 0 : { *(.comment) } \ 845 .symtab 0 : { *(.symtab) } \ 846 .strtab 0 : { *(.strtab) } \ 847 .shstrtab 0 : { *(.shstrtab) } 848 849 #ifdef CONFIG_GENERIC_BUG 850 #define BUG_TABLE \ 851 . = ALIGN(8); \ 852 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 853 __start___bug_table = .; \ 854 KEEP(*(__bug_table)) \ 855 __stop___bug_table = .; \ 856 } 857 #else 858 #define BUG_TABLE 859 #endif 860 861 #ifdef CONFIG_UNWINDER_ORC 862 #define ORC_UNWIND_TABLE \ 863 . = ALIGN(4); \ 864 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \ 865 __start_orc_unwind_ip = .; \ 866 KEEP(*(.orc_unwind_ip)) \ 867 __stop_orc_unwind_ip = .; \ 868 } \ 869 . = ALIGN(2); \ 870 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \ 871 __start_orc_unwind = .; \ 872 KEEP(*(.orc_unwind)) \ 873 __stop_orc_unwind = .; \ 874 } \ 875 . = ALIGN(4); \ 876 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \ 877 orc_lookup = .; \ 878 . += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) / \ 879 LOOKUP_BLOCK_SIZE) + 1) * 4; \ 880 orc_lookup_end = .; \ 881 } 882 #else 883 #define ORC_UNWIND_TABLE 884 #endif 885 886 #ifdef CONFIG_PM_TRACE 887 #define TRACEDATA \ 888 . = ALIGN(4); \ 889 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 890 __tracedata_start = .; \ 891 KEEP(*(.tracedata)) \ 892 __tracedata_end = .; \ 893 } 894 #else 895 #define TRACEDATA 896 #endif 897 898 #define NOTES \ 899 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 900 __start_notes = .; \ 901 KEEP(*(.note.*)) \ 902 __stop_notes = .; \ 903 } NOTES_HEADERS \ 904 NOTES_HEADERS_RESTORE 905 906 #define INIT_SETUP(initsetup_align) \ 907 . = ALIGN(initsetup_align); \ 908 __setup_start = .; \ 909 KEEP(*(.init.setup)) \ 910 __setup_end = .; 911 912 #define INIT_CALLS_LEVEL(level) \ 913 __initcall##level##_start = .; \ 914 KEEP(*(.initcall##level##.init)) \ 915 KEEP(*(.initcall##level##s.init)) \ 916 917 #define INIT_CALLS \ 918 __initcall_start = .; \ 919 KEEP(*(.initcallearly.init)) \ 920 INIT_CALLS_LEVEL(0) \ 921 INIT_CALLS_LEVEL(1) \ 922 INIT_CALLS_LEVEL(2) \ 923 INIT_CALLS_LEVEL(3) \ 924 INIT_CALLS_LEVEL(4) \ 925 INIT_CALLS_LEVEL(5) \ 926 INIT_CALLS_LEVEL(rootfs) \ 927 INIT_CALLS_LEVEL(6) \ 928 INIT_CALLS_LEVEL(7) \ 929 __initcall_end = .; 930 931 #define CON_INITCALL \ 932 __con_initcall_start = .; \ 933 KEEP(*(.con_initcall.init)) \ 934 __con_initcall_end = .; 935 936 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */ 937 #define KUNIT_TABLE() \ 938 . = ALIGN(8); \ 939 __kunit_suites_start = .; \ 940 KEEP(*(.kunit_test_suites)) \ 941 __kunit_suites_end = .; 942 943 #ifdef CONFIG_BLK_DEV_INITRD 944 #define INIT_RAM_FS \ 945 . = ALIGN(4); \ 946 __initramfs_start = .; \ 947 KEEP(*(.init.ramfs)) \ 948 . = ALIGN(8); \ 949 KEEP(*(.init.ramfs.info)) 950 #else 951 #define INIT_RAM_FS 952 #endif 953 954 /* 955 * Memory encryption operates on a page basis. Since we need to clear 956 * the memory encryption mask for this section, it needs to be aligned 957 * on a page boundary and be a page-size multiple in length. 958 * 959 * Note: We use a separate section so that only this section gets 960 * decrypted to avoid exposing more than we wish. 961 */ 962 #ifdef CONFIG_AMD_MEM_ENCRYPT 963 #define PERCPU_DECRYPTED_SECTION \ 964 . = ALIGN(PAGE_SIZE); \ 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 -fsanitize=kernel-address and -fsanitize=thread produce 991 * unwanted sections (.eh_frame and .init_array.*), but 992 * CONFIG_CONSTRUCTORS wants to keep any .init_array.* sections. 993 * https://bugs.llvm.org/show_bug.cgi?id=46478 994 */ 995 #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN) 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