1 /* 2 * Helper macros to support writing architecture specific 3 * linker scripts. 4 * 5 * A minimal linker scripts has following content: 6 * [This is a sample, architectures may have special requiriements] 7 * 8 * OUTPUT_FORMAT(...) 9 * OUTPUT_ARCH(...) 10 * ENTRY(...) 11 * SECTIONS 12 * { 13 * . = START; 14 * __init_begin = .; 15 * HEAD_TEXT_SECTION 16 * INIT_TEXT_SECTION(PAGE_SIZE) 17 * INIT_DATA_SECTION(...) 18 * PERCPU_SECTION(CACHELINE_SIZE) 19 * __init_end = .; 20 * 21 * _stext = .; 22 * TEXT_SECTION = 0 23 * _etext = .; 24 * 25 * _sdata = .; 26 * RO_DATA(PAGE_SIZE) 27 * RW_DATA(...) 28 * _edata = .; 29 * 30 * EXCEPTION_TABLE(...) 31 * 32 * BSS_SECTION(0, 0, 0) 33 * _end = .; 34 * 35 * STABS_DEBUG 36 * DWARF_DEBUG 37 * ELF_DETAILS 38 * 39 * DISCARDS // must be the last 40 * } 41 * 42 * [__init_begin, __init_end] is the init section that may be freed after init 43 * // __init_begin and __init_end should be page aligned, so that we can 44 * // free the whole .init memory 45 * [_stext, _etext] is the text section 46 * [_sdata, _edata] is the data section 47 * 48 * Some of the included output section have their own set of constants. 49 * Examples are: [__initramfs_start, __initramfs_end] for initramfs and 50 * [__nosave_begin, __nosave_end] for the nosave data 51 */ 52 53 #ifndef LOAD_OFFSET 54 #define LOAD_OFFSET 0 55 #endif 56 57 /* 58 * Only some architectures want to have the .notes segment visible in 59 * a separate PT_NOTE ELF Program Header. When this happens, it needs 60 * to be visible in both the kernel text's PT_LOAD and the PT_NOTE 61 * Program Headers. In this case, though, the PT_LOAD needs to be made 62 * the default again so that all the following sections don't also end 63 * up in the PT_NOTE Program Header. 64 */ 65 #ifdef EMITS_PT_NOTE 66 #define NOTES_HEADERS :text :note 67 #define NOTES_HEADERS_RESTORE __restore_ph : { *(.__restore_ph) } :text 68 #else 69 #define NOTES_HEADERS 70 #define NOTES_HEADERS_RESTORE 71 #endif 72 73 /* 74 * Some architectures have non-executable read-only exception tables. 75 * They can be added to the RO_DATA segment by specifying their desired 76 * alignment. 77 */ 78 #ifdef RO_EXCEPTION_TABLE_ALIGN 79 #define RO_EXCEPTION_TABLE EXCEPTION_TABLE(RO_EXCEPTION_TABLE_ALIGN) 80 #else 81 #define RO_EXCEPTION_TABLE 82 #endif 83 84 /* Align . to a 8 byte boundary equals to maximum function alignment. */ 85 #define ALIGN_FUNCTION() . = ALIGN(8) 86 87 /* 88 * LD_DEAD_CODE_DATA_ELIMINATION option enables -fdata-sections, which 89 * generates .data.identifier sections, which need to be pulled in with 90 * .data. We don't want to pull in .data..other sections, which Linux 91 * has defined. Same for text and bss. 92 * 93 * With LTO_CLANG, the linker also splits sections by default, so we need 94 * these macros to combine the sections during the final link. 95 * 96 * RODATA_MAIN is not used because existing code already defines .rodata.x 97 * sections to be brought in with rodata. 98 */ 99 #if defined(CONFIG_LD_DEAD_CODE_DATA_ELIMINATION) || defined(CONFIG_LTO_CLANG) 100 #define TEXT_MAIN .text .text.[0-9a-zA-Z_]* 101 #define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..L* .data..compoundliteral* .data.$__unnamed_* .data.$L* 102 #define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]* 103 #define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]* .rodata..L* 104 #define BSS_MAIN .bss .bss.[0-9a-zA-Z_]* .bss..compoundliteral* 105 #define SBSS_MAIN .sbss .sbss.[0-9a-zA-Z_]* 106 #else 107 #define TEXT_MAIN .text 108 #define DATA_MAIN .data 109 #define SDATA_MAIN .sdata 110 #define RODATA_MAIN .rodata 111 #define BSS_MAIN .bss 112 #define SBSS_MAIN .sbss 113 #endif 114 115 /* 116 * GCC 4.5 and later have a 32 bytes section alignment for structures. 117 * Except GCC 4.9, that feels the need to align on 64 bytes. 118 */ 119 #define STRUCT_ALIGNMENT 32 120 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT) 121 122 /* 123 * The order of the sched class addresses are important, as they are 124 * used to determine the order of the priority of each sched class in 125 * relation to each other. 126 */ 127 #define SCHED_DATA \ 128 STRUCT_ALIGN(); \ 129 __sched_class_highest = .; \ 130 *(__stop_sched_class) \ 131 *(__dl_sched_class) \ 132 *(__rt_sched_class) \ 133 *(__fair_sched_class) \ 134 *(__idle_sched_class) \ 135 __sched_class_lowest = .; 136 137 /* The actual configuration determine if the init/exit sections 138 * are handled as text/data or they can be discarded (which 139 * often happens at runtime) 140 */ 141 #ifdef CONFIG_HOTPLUG_CPU 142 #define CPU_KEEP(sec) *(.cpu##sec) 143 #define CPU_DISCARD(sec) 144 #else 145 #define CPU_KEEP(sec) 146 #define CPU_DISCARD(sec) *(.cpu##sec) 147 #endif 148 149 #if defined(CONFIG_MEMORY_HOTPLUG) 150 #define MEM_KEEP(sec) *(.mem##sec) 151 #define MEM_DISCARD(sec) 152 #else 153 #define MEM_KEEP(sec) 154 #define MEM_DISCARD(sec) *(.mem##sec) 155 #endif 156 157 #ifndef CONFIG_HAVE_DYNAMIC_FTRACE_NO_PATCHABLE 158 #define KEEP_PATCHABLE KEEP(*(__patchable_function_entries)) 159 #define PATCHABLE_DISCARDS 160 #else 161 #define KEEP_PATCHABLE 162 #define PATCHABLE_DISCARDS *(__patchable_function_entries) 163 #endif 164 165 #ifdef CONFIG_FTRACE_MCOUNT_RECORD 166 /* 167 * The ftrace call sites are logged to a section whose name depends on the 168 * compiler option used. A given kernel image will only use one, AKA 169 * FTRACE_CALLSITE_SECTION. We capture all of them here to avoid header 170 * dependencies for FTRACE_CALLSITE_SECTION's definition. 171 * 172 * Need to also make ftrace_stub_graph point to ftrace_stub 173 * so that the same stub location may have different protocols 174 * and not mess up with C verifiers. 175 * 176 * ftrace_ops_list_func will be defined as arch_ftrace_ops_list_func 177 * as some archs will have a different prototype for that function 178 * but ftrace_ops_list_func() will have a single prototype. 179 */ 180 #define MCOUNT_REC() . = ALIGN(8); \ 181 __start_mcount_loc = .; \ 182 KEEP(*(__mcount_loc)) \ 183 KEEP_PATCHABLE \ 184 __stop_mcount_loc = .; \ 185 ftrace_stub_graph = ftrace_stub; \ 186 ftrace_ops_list_func = arch_ftrace_ops_list_func; 187 #else 188 # ifdef CONFIG_FUNCTION_TRACER 189 # define MCOUNT_REC() ftrace_stub_graph = ftrace_stub; \ 190 ftrace_ops_list_func = arch_ftrace_ops_list_func; 191 # else 192 # define MCOUNT_REC() 193 # endif 194 #endif 195 196 #ifdef CONFIG_TRACE_BRANCH_PROFILING 197 #define LIKELY_PROFILE() __start_annotated_branch_profile = .; \ 198 KEEP(*(_ftrace_annotated_branch)) \ 199 __stop_annotated_branch_profile = .; 200 #else 201 #define LIKELY_PROFILE() 202 #endif 203 204 #ifdef CONFIG_PROFILE_ALL_BRANCHES 205 #define BRANCH_PROFILE() __start_branch_profile = .; \ 206 KEEP(*(_ftrace_branch)) \ 207 __stop_branch_profile = .; 208 #else 209 #define BRANCH_PROFILE() 210 #endif 211 212 #ifdef CONFIG_KPROBES 213 #define KPROBE_BLACKLIST() . = ALIGN(8); \ 214 __start_kprobe_blacklist = .; \ 215 KEEP(*(_kprobe_blacklist)) \ 216 __stop_kprobe_blacklist = .; 217 #else 218 #define KPROBE_BLACKLIST() 219 #endif 220 221 #ifdef CONFIG_FUNCTION_ERROR_INJECTION 222 #define ERROR_INJECT_WHITELIST() STRUCT_ALIGN(); \ 223 __start_error_injection_whitelist = .; \ 224 KEEP(*(_error_injection_whitelist)) \ 225 __stop_error_injection_whitelist = .; 226 #else 227 #define ERROR_INJECT_WHITELIST() 228 #endif 229 230 #ifdef CONFIG_EVENT_TRACING 231 #define FTRACE_EVENTS() . = ALIGN(8); \ 232 __start_ftrace_events = .; \ 233 KEEP(*(_ftrace_events)) \ 234 __stop_ftrace_events = .; \ 235 __start_ftrace_eval_maps = .; \ 236 KEEP(*(_ftrace_eval_map)) \ 237 __stop_ftrace_eval_maps = .; 238 #else 239 #define FTRACE_EVENTS() 240 #endif 241 242 #ifdef CONFIG_TRACING 243 #define TRACE_PRINTKS() __start___trace_bprintk_fmt = .; \ 244 KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \ 245 __stop___trace_bprintk_fmt = .; 246 #define TRACEPOINT_STR() __start___tracepoint_str = .; \ 247 KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \ 248 __stop___tracepoint_str = .; 249 #else 250 #define TRACE_PRINTKS() 251 #define TRACEPOINT_STR() 252 #endif 253 254 #ifdef CONFIG_FTRACE_SYSCALLS 255 #define TRACE_SYSCALLS() . = ALIGN(8); \ 256 __start_syscalls_metadata = .; \ 257 KEEP(*(__syscalls_metadata)) \ 258 __stop_syscalls_metadata = .; 259 #else 260 #define TRACE_SYSCALLS() 261 #endif 262 263 #ifdef CONFIG_BPF_EVENTS 264 #define BPF_RAW_TP() STRUCT_ALIGN(); \ 265 __start__bpf_raw_tp = .; \ 266 KEEP(*(__bpf_raw_tp_map)) \ 267 __stop__bpf_raw_tp = .; 268 #else 269 #define BPF_RAW_TP() 270 #endif 271 272 #ifdef CONFIG_SERIAL_EARLYCON 273 #define EARLYCON_TABLE() . = ALIGN(8); \ 274 __earlycon_table = .; \ 275 KEEP(*(__earlycon_table)) \ 276 __earlycon_table_end = .; 277 #else 278 #define EARLYCON_TABLE() 279 #endif 280 281 #ifdef CONFIG_SECURITY 282 #define LSM_TABLE() . = ALIGN(8); \ 283 __start_lsm_info = .; \ 284 KEEP(*(.lsm_info.init)) \ 285 __end_lsm_info = .; 286 #define EARLY_LSM_TABLE() . = ALIGN(8); \ 287 __start_early_lsm_info = .; \ 288 KEEP(*(.early_lsm_info.init)) \ 289 __end_early_lsm_info = .; 290 #else 291 #define LSM_TABLE() 292 #define EARLY_LSM_TABLE() 293 #endif 294 295 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name) 296 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name) 297 #define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name) 298 #define _OF_TABLE_0(name) 299 #define _OF_TABLE_1(name) \ 300 . = ALIGN(8); \ 301 __##name##_of_table = .; \ 302 KEEP(*(__##name##_of_table)) \ 303 KEEP(*(__##name##_of_table_end)) 304 305 #define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer) 306 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip) 307 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk) 308 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem) 309 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method) 310 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method) 311 312 #ifdef CONFIG_ACPI 313 #define ACPI_PROBE_TABLE(name) \ 314 . = ALIGN(8); \ 315 __##name##_acpi_probe_table = .; \ 316 KEEP(*(__##name##_acpi_probe_table)) \ 317 __##name##_acpi_probe_table_end = .; 318 #else 319 #define ACPI_PROBE_TABLE(name) 320 #endif 321 322 #ifdef CONFIG_THERMAL 323 #define THERMAL_TABLE(name) \ 324 . = ALIGN(8); \ 325 __##name##_thermal_table = .; \ 326 KEEP(*(__##name##_thermal_table)) \ 327 __##name##_thermal_table_end = .; 328 #else 329 #define THERMAL_TABLE(name) 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 #ifdef CONFIG_HAVE_STATIC_CALL_INLINE 406 #define STATIC_CALL_DATA \ 407 . = ALIGN(8); \ 408 __start_static_call_sites = .; \ 409 KEEP(*(.static_call_sites)) \ 410 __stop_static_call_sites = .; \ 411 __start_static_call_tramp_key = .; \ 412 KEEP(*(.static_call_tramp_key)) \ 413 __stop_static_call_tramp_key = .; 414 #else 415 #define STATIC_CALL_DATA 416 #endif 417 418 /* 419 * Allow architectures to handle ro_after_init data on their 420 * own by defining an empty RO_AFTER_INIT_DATA. 421 */ 422 #ifndef RO_AFTER_INIT_DATA 423 #define RO_AFTER_INIT_DATA \ 424 . = ALIGN(8); \ 425 __start_ro_after_init = .; \ 426 *(.data..ro_after_init) \ 427 JUMP_TABLE_DATA \ 428 STATIC_CALL_DATA \ 429 __end_ro_after_init = .; 430 #endif 431 432 /* 433 * .kcfi_traps contains a list KCFI trap locations. 434 */ 435 #ifndef KCFI_TRAPS 436 #ifdef CONFIG_ARCH_USES_CFI_TRAPS 437 #define KCFI_TRAPS \ 438 __kcfi_traps : AT(ADDR(__kcfi_traps) - LOAD_OFFSET) { \ 439 __start___kcfi_traps = .; \ 440 KEEP(*(.kcfi_traps)) \ 441 __stop___kcfi_traps = .; \ 442 } 443 #else 444 #define KCFI_TRAPS 445 #endif 446 #endif 447 448 /* 449 * Read only Data 450 */ 451 #define RO_DATA(align) \ 452 . = ALIGN((align)); \ 453 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 454 __start_rodata = .; \ 455 *(.rodata) *(.rodata.*) \ 456 SCHED_DATA \ 457 RO_AFTER_INIT_DATA /* Read only after init */ \ 458 . = ALIGN(8); \ 459 __start___tracepoints_ptrs = .; \ 460 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \ 461 __stop___tracepoints_ptrs = .; \ 462 *(__tracepoints_strings)/* Tracepoints: strings */ \ 463 } \ 464 \ 465 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 466 *(.rodata1) \ 467 } \ 468 \ 469 /* PCI quirks */ \ 470 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 471 __start_pci_fixups_early = .; \ 472 KEEP(*(.pci_fixup_early)) \ 473 __end_pci_fixups_early = .; \ 474 __start_pci_fixups_header = .; \ 475 KEEP(*(.pci_fixup_header)) \ 476 __end_pci_fixups_header = .; \ 477 __start_pci_fixups_final = .; \ 478 KEEP(*(.pci_fixup_final)) \ 479 __end_pci_fixups_final = .; \ 480 __start_pci_fixups_enable = .; \ 481 KEEP(*(.pci_fixup_enable)) \ 482 __end_pci_fixups_enable = .; \ 483 __start_pci_fixups_resume = .; \ 484 KEEP(*(.pci_fixup_resume)) \ 485 __end_pci_fixups_resume = .; \ 486 __start_pci_fixups_resume_early = .; \ 487 KEEP(*(.pci_fixup_resume_early)) \ 488 __end_pci_fixups_resume_early = .; \ 489 __start_pci_fixups_suspend = .; \ 490 KEEP(*(.pci_fixup_suspend)) \ 491 __end_pci_fixups_suspend = .; \ 492 __start_pci_fixups_suspend_late = .; \ 493 KEEP(*(.pci_fixup_suspend_late)) \ 494 __end_pci_fixups_suspend_late = .; \ 495 } \ 496 \ 497 FW_LOADER_BUILT_IN_DATA \ 498 TRACEDATA \ 499 \ 500 PRINTK_INDEX \ 501 \ 502 /* Kernel symbol table: Normal symbols */ \ 503 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 504 __start___ksymtab = .; \ 505 KEEP(*(SORT(___ksymtab+*))) \ 506 __stop___ksymtab = .; \ 507 } \ 508 \ 509 /* Kernel symbol table: GPL-only symbols */ \ 510 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 511 __start___ksymtab_gpl = .; \ 512 KEEP(*(SORT(___ksymtab_gpl+*))) \ 513 __stop___ksymtab_gpl = .; \ 514 } \ 515 \ 516 /* Kernel symbol table: Normal symbols */ \ 517 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 518 __start___kcrctab = .; \ 519 KEEP(*(SORT(___kcrctab+*))) \ 520 __stop___kcrctab = .; \ 521 } \ 522 \ 523 /* Kernel symbol table: GPL-only symbols */ \ 524 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 525 __start___kcrctab_gpl = .; \ 526 KEEP(*(SORT(___kcrctab_gpl+*))) \ 527 __stop___kcrctab_gpl = .; \ 528 } \ 529 \ 530 /* Kernel symbol table: strings */ \ 531 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 532 *(__ksymtab_strings) \ 533 } \ 534 \ 535 /* __*init sections */ \ 536 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 537 *(.ref.rodata) \ 538 MEM_KEEP(init.rodata) \ 539 MEM_KEEP(exit.rodata) \ 540 } \ 541 \ 542 /* Built-in module parameters. */ \ 543 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 544 __start___param = .; \ 545 KEEP(*(__param)) \ 546 __stop___param = .; \ 547 } \ 548 \ 549 /* Built-in module versions. */ \ 550 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 551 __start___modver = .; \ 552 KEEP(*(__modver)) \ 553 __stop___modver = .; \ 554 } \ 555 \ 556 KCFI_TRAPS \ 557 \ 558 RO_EXCEPTION_TABLE \ 559 NOTES \ 560 BTF \ 561 \ 562 . = ALIGN((align)); \ 563 __end_rodata = .; 564 565 566 /* 567 * Non-instrumentable text section 568 */ 569 #define NOINSTR_TEXT \ 570 ALIGN_FUNCTION(); \ 571 __noinstr_text_start = .; \ 572 *(.noinstr.text) \ 573 __noinstr_text_end = .; 574 575 /* 576 * .text section. Map to function alignment to avoid address changes 577 * during second ld run in second ld pass when generating System.map 578 * 579 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead 580 * code elimination is enabled, so these sections should be converted 581 * to use ".." first. 582 */ 583 #define TEXT_TEXT \ 584 ALIGN_FUNCTION(); \ 585 *(.text.hot .text.hot.*) \ 586 *(TEXT_MAIN .text.fixup) \ 587 *(.text.unlikely .text.unlikely.*) \ 588 *(.text.unknown .text.unknown.*) \ 589 NOINSTR_TEXT \ 590 *(.text..refcount) \ 591 *(.ref.text) \ 592 *(.text.asan.* .text.tsan.*) \ 593 MEM_KEEP(init.text*) \ 594 MEM_KEEP(exit.text*) \ 595 596 597 /* sched.text is aling to function alignment to secure we have same 598 * address even at second ld pass when generating System.map */ 599 #define SCHED_TEXT \ 600 ALIGN_FUNCTION(); \ 601 __sched_text_start = .; \ 602 *(.sched.text) \ 603 __sched_text_end = .; 604 605 /* spinlock.text is aling to function alignment to secure we have same 606 * address even at second ld pass when generating System.map */ 607 #define LOCK_TEXT \ 608 ALIGN_FUNCTION(); \ 609 __lock_text_start = .; \ 610 *(.spinlock.text) \ 611 __lock_text_end = .; 612 613 #define CPUIDLE_TEXT \ 614 ALIGN_FUNCTION(); \ 615 __cpuidle_text_start = .; \ 616 *(.cpuidle.text) \ 617 __cpuidle_text_end = .; 618 619 #define KPROBES_TEXT \ 620 ALIGN_FUNCTION(); \ 621 __kprobes_text_start = .; \ 622 *(.kprobes.text) \ 623 __kprobes_text_end = .; 624 625 #define ENTRY_TEXT \ 626 ALIGN_FUNCTION(); \ 627 __entry_text_start = .; \ 628 *(.entry.text) \ 629 __entry_text_end = .; 630 631 #define IRQENTRY_TEXT \ 632 ALIGN_FUNCTION(); \ 633 __irqentry_text_start = .; \ 634 *(.irqentry.text) \ 635 __irqentry_text_end = .; 636 637 #define SOFTIRQENTRY_TEXT \ 638 ALIGN_FUNCTION(); \ 639 __softirqentry_text_start = .; \ 640 *(.softirqentry.text) \ 641 __softirqentry_text_end = .; 642 643 #define STATIC_CALL_TEXT \ 644 ALIGN_FUNCTION(); \ 645 __static_call_text_start = .; \ 646 *(.static_call.text) \ 647 __static_call_text_end = .; 648 649 /* Section used for early init (in .S files) */ 650 #define HEAD_TEXT KEEP(*(.head.text)) 651 652 #define HEAD_TEXT_SECTION \ 653 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 654 HEAD_TEXT \ 655 } 656 657 /* 658 * Exception table 659 */ 660 #define EXCEPTION_TABLE(align) \ 661 . = ALIGN(align); \ 662 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 663 __start___ex_table = .; \ 664 KEEP(*(__ex_table)) \ 665 __stop___ex_table = .; \ 666 } 667 668 /* 669 * .BTF 670 */ 671 #ifdef CONFIG_DEBUG_INFO_BTF 672 #define BTF \ 673 .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \ 674 __start_BTF = .; \ 675 KEEP(*(.BTF)) \ 676 __stop_BTF = .; \ 677 } \ 678 . = ALIGN(4); \ 679 .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) { \ 680 *(.BTF_ids) \ 681 } 682 #else 683 #define BTF 684 #endif 685 686 /* 687 * Init task 688 */ 689 #define INIT_TASK_DATA_SECTION(align) \ 690 . = ALIGN(align); \ 691 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 692 INIT_TASK_DATA(align) \ 693 } 694 695 #ifdef CONFIG_CONSTRUCTORS 696 #define KERNEL_CTORS() . = ALIGN(8); \ 697 __ctors_start = .; \ 698 KEEP(*(SORT(.ctors.*))) \ 699 KEEP(*(.ctors)) \ 700 KEEP(*(SORT(.init_array.*))) \ 701 KEEP(*(.init_array)) \ 702 __ctors_end = .; 703 #else 704 #define KERNEL_CTORS() 705 #endif 706 707 /* init and exit section handling */ 708 #define INIT_DATA \ 709 KEEP(*(SORT(___kentry+*))) \ 710 *(.init.data init.data.*) \ 711 MEM_DISCARD(init.data*) \ 712 KERNEL_CTORS() \ 713 MCOUNT_REC() \ 714 *(.init.rodata .init.rodata.*) \ 715 FTRACE_EVENTS() \ 716 TRACE_SYSCALLS() \ 717 KPROBE_BLACKLIST() \ 718 ERROR_INJECT_WHITELIST() \ 719 MEM_DISCARD(init.rodata) \ 720 CLK_OF_TABLES() \ 721 RESERVEDMEM_OF_TABLES() \ 722 TIMER_OF_TABLES() \ 723 CPU_METHOD_OF_TABLES() \ 724 CPUIDLE_METHOD_OF_TABLES() \ 725 KERNEL_DTB() \ 726 IRQCHIP_OF_MATCH_TABLE() \ 727 ACPI_PROBE_TABLE(irqchip) \ 728 ACPI_PROBE_TABLE(timer) \ 729 THERMAL_TABLE(governor) \ 730 EARLYCON_TABLE() \ 731 LSM_TABLE() \ 732 EARLY_LSM_TABLE() \ 733 KUNIT_TABLE() 734 735 #define INIT_TEXT \ 736 *(.init.text .init.text.*) \ 737 *(.text.startup) \ 738 MEM_DISCARD(init.text*) 739 740 #define EXIT_DATA \ 741 *(.exit.data .exit.data.*) \ 742 *(.fini_array .fini_array.*) \ 743 *(.dtors .dtors.*) \ 744 MEM_DISCARD(exit.data*) \ 745 MEM_DISCARD(exit.rodata*) 746 747 #define EXIT_TEXT \ 748 *(.exit.text) \ 749 *(.text.exit) \ 750 MEM_DISCARD(exit.text) 751 752 #define EXIT_CALL \ 753 *(.exitcall.exit) 754 755 /* 756 * bss (Block Started by Symbol) - uninitialized data 757 * zeroed during startup 758 */ 759 #define SBSS(sbss_align) \ 760 . = ALIGN(sbss_align); \ 761 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 762 *(.dynsbss) \ 763 *(SBSS_MAIN) \ 764 *(.scommon) \ 765 } 766 767 /* 768 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 769 * sections to the front of bss. 770 */ 771 #ifndef BSS_FIRST_SECTIONS 772 #define BSS_FIRST_SECTIONS 773 #endif 774 775 #define BSS(bss_align) \ 776 . = ALIGN(bss_align); \ 777 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 778 BSS_FIRST_SECTIONS \ 779 . = ALIGN(PAGE_SIZE); \ 780 *(.bss..page_aligned) \ 781 . = ALIGN(PAGE_SIZE); \ 782 *(.dynbss) \ 783 *(BSS_MAIN) \ 784 *(COMMON) \ 785 } 786 787 /* 788 * DWARF debug sections. 789 * Symbols in the DWARF debugging sections are relative to 790 * the beginning of the section so we begin them at 0. 791 */ 792 #define DWARF_DEBUG \ 793 /* DWARF 1 */ \ 794 .debug 0 : { *(.debug) } \ 795 .line 0 : { *(.line) } \ 796 /* GNU DWARF 1 extensions */ \ 797 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 798 .debug_sfnames 0 : { *(.debug_sfnames) } \ 799 /* DWARF 1.1 and DWARF 2 */ \ 800 .debug_aranges 0 : { *(.debug_aranges) } \ 801 .debug_pubnames 0 : { *(.debug_pubnames) } \ 802 /* DWARF 2 */ \ 803 .debug_info 0 : { *(.debug_info \ 804 .gnu.linkonce.wi.*) } \ 805 .debug_abbrev 0 : { *(.debug_abbrev) } \ 806 .debug_line 0 : { *(.debug_line) } \ 807 .debug_frame 0 : { *(.debug_frame) } \ 808 .debug_str 0 : { *(.debug_str) } \ 809 .debug_loc 0 : { *(.debug_loc) } \ 810 .debug_macinfo 0 : { *(.debug_macinfo) } \ 811 .debug_pubtypes 0 : { *(.debug_pubtypes) } \ 812 /* DWARF 3 */ \ 813 .debug_ranges 0 : { *(.debug_ranges) } \ 814 /* SGI/MIPS DWARF 2 extensions */ \ 815 .debug_weaknames 0 : { *(.debug_weaknames) } \ 816 .debug_funcnames 0 : { *(.debug_funcnames) } \ 817 .debug_typenames 0 : { *(.debug_typenames) } \ 818 .debug_varnames 0 : { *(.debug_varnames) } \ 819 /* GNU DWARF 2 extensions */ \ 820 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \ 821 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \ 822 /* DWARF 4 */ \ 823 .debug_types 0 : { *(.debug_types) } \ 824 /* DWARF 5 */ \ 825 .debug_addr 0 : { *(.debug_addr) } \ 826 .debug_line_str 0 : { *(.debug_line_str) } \ 827 .debug_loclists 0 : { *(.debug_loclists) } \ 828 .debug_macro 0 : { *(.debug_macro) } \ 829 .debug_names 0 : { *(.debug_names) } \ 830 .debug_rnglists 0 : { *(.debug_rnglists) } \ 831 .debug_str_offsets 0 : { *(.debug_str_offsets) } 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 text_size = _etext - _stext; \ 876 . = ALIGN(4); \ 877 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \ 878 orc_lookup = .; \ 879 . += (((text_size + LOOKUP_BLOCK_SIZE - 1) / \ 880 LOOKUP_BLOCK_SIZE) + 1) * 4; \ 881 orc_lookup_end = .; \ 882 } 883 #else 884 #define ORC_UNWIND_TABLE 885 #endif 886 887 /* Built-in firmware blobs */ 888 #ifdef CONFIG_FW_LOADER 889 #define FW_LOADER_BUILT_IN_DATA \ 890 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) { \ 891 __start_builtin_fw = .; \ 892 KEEP(*(.builtin_fw)) \ 893 __end_builtin_fw = .; \ 894 } 895 #else 896 #define FW_LOADER_BUILT_IN_DATA 897 #endif 898 899 #ifdef CONFIG_PM_TRACE 900 #define TRACEDATA \ 901 . = ALIGN(4); \ 902 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 903 __tracedata_start = .; \ 904 KEEP(*(.tracedata)) \ 905 __tracedata_end = .; \ 906 } 907 #else 908 #define TRACEDATA 909 #endif 910 911 #ifdef CONFIG_PRINTK_INDEX 912 #define PRINTK_INDEX \ 913 .printk_index : AT(ADDR(.printk_index) - LOAD_OFFSET) { \ 914 __start_printk_index = .; \ 915 *(.printk_index) \ 916 __stop_printk_index = .; \ 917 } 918 #else 919 #define PRINTK_INDEX 920 #endif 921 922 #define NOTES \ 923 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 924 __start_notes = .; \ 925 KEEP(*(.note.*)) \ 926 __stop_notes = .; \ 927 } NOTES_HEADERS \ 928 NOTES_HEADERS_RESTORE 929 930 #define INIT_SETUP(initsetup_align) \ 931 . = ALIGN(initsetup_align); \ 932 __setup_start = .; \ 933 KEEP(*(.init.setup)) \ 934 __setup_end = .; 935 936 #define INIT_CALLS_LEVEL(level) \ 937 __initcall##level##_start = .; \ 938 KEEP(*(.initcall##level##.init)) \ 939 KEEP(*(.initcall##level##s.init)) \ 940 941 #define INIT_CALLS \ 942 __initcall_start = .; \ 943 KEEP(*(.initcallearly.init)) \ 944 INIT_CALLS_LEVEL(0) \ 945 INIT_CALLS_LEVEL(1) \ 946 INIT_CALLS_LEVEL(2) \ 947 INIT_CALLS_LEVEL(3) \ 948 INIT_CALLS_LEVEL(4) \ 949 INIT_CALLS_LEVEL(5) \ 950 INIT_CALLS_LEVEL(rootfs) \ 951 INIT_CALLS_LEVEL(6) \ 952 INIT_CALLS_LEVEL(7) \ 953 __initcall_end = .; 954 955 #define CON_INITCALL \ 956 __con_initcall_start = .; \ 957 KEEP(*(.con_initcall.init)) \ 958 __con_initcall_end = .; 959 960 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */ 961 #define KUNIT_TABLE() \ 962 . = ALIGN(8); \ 963 __kunit_suites_start = .; \ 964 KEEP(*(.kunit_test_suites)) \ 965 __kunit_suites_end = .; 966 967 #ifdef CONFIG_BLK_DEV_INITRD 968 #define INIT_RAM_FS \ 969 . = ALIGN(4); \ 970 __initramfs_start = .; \ 971 KEEP(*(.init.ramfs)) \ 972 . = ALIGN(8); \ 973 KEEP(*(.init.ramfs.info)) 974 #else 975 #define INIT_RAM_FS 976 #endif 977 978 /* 979 * Memory encryption operates on a page basis. Since we need to clear 980 * the memory encryption mask for this section, it needs to be aligned 981 * on a page boundary and be a page-size multiple in length. 982 * 983 * Note: We use a separate section so that only this section gets 984 * decrypted to avoid exposing more than we wish. 985 */ 986 #ifdef CONFIG_AMD_MEM_ENCRYPT 987 #define PERCPU_DECRYPTED_SECTION \ 988 . = ALIGN(PAGE_SIZE); \ 989 *(.data..decrypted) \ 990 *(.data..percpu..decrypted) \ 991 . = ALIGN(PAGE_SIZE); 992 #else 993 #define PERCPU_DECRYPTED_SECTION 994 #endif 995 996 997 /* 998 * Default discarded sections. 999 * 1000 * Some archs want to discard exit text/data at runtime rather than 1001 * link time due to cross-section references such as alt instructions, 1002 * bug table, eh_frame, etc. DISCARDS must be the last of output 1003 * section definitions so that such archs put those in earlier section 1004 * definitions. 1005 */ 1006 #ifdef RUNTIME_DISCARD_EXIT 1007 #define EXIT_DISCARDS 1008 #else 1009 #define EXIT_DISCARDS \ 1010 EXIT_TEXT \ 1011 EXIT_DATA 1012 #endif 1013 1014 /* 1015 * Clang's -fprofile-arcs, -fsanitize=kernel-address, and 1016 * -fsanitize=thread produce unwanted sections (.eh_frame 1017 * and .init_array.*), but CONFIG_CONSTRUCTORS wants to 1018 * keep any .init_array.* sections. 1019 * https://bugs.llvm.org/show_bug.cgi?id=46478 1020 */ 1021 #if defined(CONFIG_GCOV_KERNEL) || defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN) 1022 # ifdef CONFIG_CONSTRUCTORS 1023 # define SANITIZER_DISCARDS \ 1024 *(.eh_frame) 1025 # else 1026 # define SANITIZER_DISCARDS \ 1027 *(.init_array) *(.init_array.*) \ 1028 *(.eh_frame) 1029 # endif 1030 #else 1031 # define SANITIZER_DISCARDS 1032 #endif 1033 1034 #define COMMON_DISCARDS \ 1035 SANITIZER_DISCARDS \ 1036 PATCHABLE_DISCARDS \ 1037 *(.discard) \ 1038 *(.discard.*) \ 1039 *(.modinfo) \ 1040 /* ld.bfd warns about .gnu.version* even when not emitted */ \ 1041 *(.gnu.version*) \ 1042 1043 #define DISCARDS \ 1044 /DISCARD/ : { \ 1045 EXIT_DISCARDS \ 1046 EXIT_CALL \ 1047 COMMON_DISCARDS \ 1048 } 1049 1050 /** 1051 * PERCPU_INPUT - the percpu input sections 1052 * @cacheline: cacheline size 1053 * 1054 * The core percpu section names and core symbols which do not rely 1055 * directly upon load addresses. 1056 * 1057 * @cacheline is used to align subsections to avoid false cacheline 1058 * sharing between subsections for different purposes. 1059 */ 1060 #define PERCPU_INPUT(cacheline) \ 1061 __per_cpu_start = .; \ 1062 *(.data..percpu..first) \ 1063 . = ALIGN(PAGE_SIZE); \ 1064 *(.data..percpu..page_aligned) \ 1065 . = ALIGN(cacheline); \ 1066 *(.data..percpu..read_mostly) \ 1067 . = ALIGN(cacheline); \ 1068 *(.data..percpu) \ 1069 *(.data..percpu..shared_aligned) \ 1070 PERCPU_DECRYPTED_SECTION \ 1071 __per_cpu_end = .; 1072 1073 /** 1074 * PERCPU_VADDR - define output section for percpu area 1075 * @cacheline: cacheline size 1076 * @vaddr: explicit base address (optional) 1077 * @phdr: destination PHDR (optional) 1078 * 1079 * Macro which expands to output section for percpu area. 1080 * 1081 * @cacheline is used to align subsections to avoid false cacheline 1082 * sharing between subsections for different purposes. 1083 * 1084 * If @vaddr is not blank, it specifies explicit base address and all 1085 * percpu symbols will be offset from the given address. If blank, 1086 * @vaddr always equals @laddr + LOAD_OFFSET. 1087 * 1088 * @phdr defines the output PHDR to use if not blank. Be warned that 1089 * output PHDR is sticky. If @phdr is specified, the next output 1090 * section in the linker script will go there too. @phdr should have 1091 * a leading colon. 1092 * 1093 * Note that this macros defines __per_cpu_load as an absolute symbol. 1094 * If there is no need to put the percpu section at a predetermined 1095 * address, use PERCPU_SECTION. 1096 */ 1097 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 1098 __per_cpu_load = .; \ 1099 .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \ 1100 PERCPU_INPUT(cacheline) \ 1101 } phdr \ 1102 . = __per_cpu_load + SIZEOF(.data..percpu); 1103 1104 /** 1105 * PERCPU_SECTION - define output section for percpu area, simple version 1106 * @cacheline: cacheline size 1107 * 1108 * Align to PAGE_SIZE and outputs output section for percpu area. This 1109 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 1110 * __per_cpu_start will be identical. 1111 * 1112 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 1113 * except that __per_cpu_load is defined as a relative symbol against 1114 * .data..percpu which is required for relocatable x86_32 configuration. 1115 */ 1116 #define PERCPU_SECTION(cacheline) \ 1117 . = ALIGN(PAGE_SIZE); \ 1118 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 1119 __per_cpu_load = .; \ 1120 PERCPU_INPUT(cacheline) \ 1121 } 1122 1123 1124 /* 1125 * Definition of the high level *_SECTION macros 1126 * They will fit only a subset of the architectures 1127 */ 1128 1129 1130 /* 1131 * Writeable data. 1132 * All sections are combined in a single .data section. 1133 * The sections following CONSTRUCTORS are arranged so their 1134 * typical alignment matches. 1135 * A cacheline is typical/always less than a PAGE_SIZE so 1136 * the sections that has this restriction (or similar) 1137 * is located before the ones requiring PAGE_SIZE alignment. 1138 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 1139 * matches the requirement of PAGE_ALIGNED_DATA. 1140 * 1141 * use 0 as page_align if page_aligned data is not used */ 1142 #define RW_DATA(cacheline, pagealigned, inittask) \ 1143 . = ALIGN(PAGE_SIZE); \ 1144 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 1145 INIT_TASK_DATA(inittask) \ 1146 NOSAVE_DATA \ 1147 PAGE_ALIGNED_DATA(pagealigned) \ 1148 CACHELINE_ALIGNED_DATA(cacheline) \ 1149 READ_MOSTLY_DATA(cacheline) \ 1150 DATA_DATA \ 1151 CONSTRUCTORS \ 1152 } \ 1153 BUG_TABLE \ 1154 1155 #define INIT_TEXT_SECTION(inittext_align) \ 1156 . = ALIGN(inittext_align); \ 1157 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 1158 _sinittext = .; \ 1159 INIT_TEXT \ 1160 _einittext = .; \ 1161 } 1162 1163 #define INIT_DATA_SECTION(initsetup_align) \ 1164 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 1165 INIT_DATA \ 1166 INIT_SETUP(initsetup_align) \ 1167 INIT_CALLS \ 1168 CON_INITCALL \ 1169 INIT_RAM_FS \ 1170 } 1171 1172 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 1173 . = ALIGN(sbss_align); \ 1174 __bss_start = .; \ 1175 SBSS(sbss_align) \ 1176 BSS(bss_align) \ 1177 . = ALIGN(stop_align); \ 1178 __bss_stop = .; 1179