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 #ifdef CONFIG_FTRACE_MCOUNT_RECORD 158 /* 159 * The ftrace call sites are logged to a section whose name depends on the 160 * compiler option used. A given kernel image will only use one, AKA 161 * FTRACE_CALLSITE_SECTION. We capture all of them here to avoid header 162 * dependencies for FTRACE_CALLSITE_SECTION's definition. 163 * 164 * Need to also make ftrace_stub_graph point to ftrace_stub 165 * so that the same stub location may have different protocols 166 * and not mess up with C verifiers. 167 * 168 * ftrace_ops_list_func will be defined as arch_ftrace_ops_list_func 169 * as some archs will have a different prototype for that function 170 * but ftrace_ops_list_func() will have a single prototype. 171 */ 172 #define MCOUNT_REC() . = ALIGN(8); \ 173 __start_mcount_loc = .; \ 174 KEEP(*(__mcount_loc)) \ 175 KEEP(*(__patchable_function_entries)) \ 176 __stop_mcount_loc = .; \ 177 ftrace_stub_graph = ftrace_stub; \ 178 ftrace_ops_list_func = arch_ftrace_ops_list_func; 179 #else 180 # ifdef CONFIG_FUNCTION_TRACER 181 # define MCOUNT_REC() ftrace_stub_graph = ftrace_stub; \ 182 ftrace_ops_list_func = arch_ftrace_ops_list_func; 183 # else 184 # define MCOUNT_REC() 185 # endif 186 #endif 187 188 #ifdef CONFIG_TRACE_BRANCH_PROFILING 189 #define LIKELY_PROFILE() __start_annotated_branch_profile = .; \ 190 KEEP(*(_ftrace_annotated_branch)) \ 191 __stop_annotated_branch_profile = .; 192 #else 193 #define LIKELY_PROFILE() 194 #endif 195 196 #ifdef CONFIG_PROFILE_ALL_BRANCHES 197 #define BRANCH_PROFILE() __start_branch_profile = .; \ 198 KEEP(*(_ftrace_branch)) \ 199 __stop_branch_profile = .; 200 #else 201 #define BRANCH_PROFILE() 202 #endif 203 204 #ifdef CONFIG_KPROBES 205 #define KPROBE_BLACKLIST() . = ALIGN(8); \ 206 __start_kprobe_blacklist = .; \ 207 KEEP(*(_kprobe_blacklist)) \ 208 __stop_kprobe_blacklist = .; 209 #else 210 #define KPROBE_BLACKLIST() 211 #endif 212 213 #ifdef CONFIG_FUNCTION_ERROR_INJECTION 214 #define ERROR_INJECT_WHITELIST() STRUCT_ALIGN(); \ 215 __start_error_injection_whitelist = .; \ 216 KEEP(*(_error_injection_whitelist)) \ 217 __stop_error_injection_whitelist = .; 218 #else 219 #define ERROR_INJECT_WHITELIST() 220 #endif 221 222 #ifdef CONFIG_EVENT_TRACING 223 #define FTRACE_EVENTS() . = ALIGN(8); \ 224 __start_ftrace_events = .; \ 225 KEEP(*(_ftrace_events)) \ 226 __stop_ftrace_events = .; \ 227 __start_ftrace_eval_maps = .; \ 228 KEEP(*(_ftrace_eval_map)) \ 229 __stop_ftrace_eval_maps = .; 230 #else 231 #define FTRACE_EVENTS() 232 #endif 233 234 #ifdef CONFIG_TRACING 235 #define TRACE_PRINTKS() __start___trace_bprintk_fmt = .; \ 236 KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \ 237 __stop___trace_bprintk_fmt = .; 238 #define TRACEPOINT_STR() __start___tracepoint_str = .; \ 239 KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \ 240 __stop___tracepoint_str = .; 241 #else 242 #define TRACE_PRINTKS() 243 #define TRACEPOINT_STR() 244 #endif 245 246 #ifdef CONFIG_FTRACE_SYSCALLS 247 #define TRACE_SYSCALLS() . = ALIGN(8); \ 248 __start_syscalls_metadata = .; \ 249 KEEP(*(__syscalls_metadata)) \ 250 __stop_syscalls_metadata = .; 251 #else 252 #define TRACE_SYSCALLS() 253 #endif 254 255 #ifdef CONFIG_BPF_EVENTS 256 #define BPF_RAW_TP() STRUCT_ALIGN(); \ 257 __start__bpf_raw_tp = .; \ 258 KEEP(*(__bpf_raw_tp_map)) \ 259 __stop__bpf_raw_tp = .; 260 #else 261 #define BPF_RAW_TP() 262 #endif 263 264 #ifdef CONFIG_SERIAL_EARLYCON 265 #define EARLYCON_TABLE() . = ALIGN(8); \ 266 __earlycon_table = .; \ 267 KEEP(*(__earlycon_table)) \ 268 __earlycon_table_end = .; 269 #else 270 #define EARLYCON_TABLE() 271 #endif 272 273 #ifdef CONFIG_SECURITY 274 #define LSM_TABLE() . = ALIGN(8); \ 275 __start_lsm_info = .; \ 276 KEEP(*(.lsm_info.init)) \ 277 __end_lsm_info = .; 278 #define EARLY_LSM_TABLE() . = ALIGN(8); \ 279 __start_early_lsm_info = .; \ 280 KEEP(*(.early_lsm_info.init)) \ 281 __end_early_lsm_info = .; 282 #else 283 #define LSM_TABLE() 284 #define EARLY_LSM_TABLE() 285 #endif 286 287 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name) 288 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name) 289 #define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name) 290 #define _OF_TABLE_0(name) 291 #define _OF_TABLE_1(name) \ 292 . = ALIGN(8); \ 293 __##name##_of_table = .; \ 294 KEEP(*(__##name##_of_table)) \ 295 KEEP(*(__##name##_of_table_end)) 296 297 #define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer) 298 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip) 299 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk) 300 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem) 301 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method) 302 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method) 303 304 #ifdef CONFIG_ACPI 305 #define ACPI_PROBE_TABLE(name) \ 306 . = ALIGN(8); \ 307 __##name##_acpi_probe_table = .; \ 308 KEEP(*(__##name##_acpi_probe_table)) \ 309 __##name##_acpi_probe_table_end = .; 310 #else 311 #define ACPI_PROBE_TABLE(name) 312 #endif 313 314 #ifdef CONFIG_THERMAL 315 #define THERMAL_TABLE(name) \ 316 . = ALIGN(8); \ 317 __##name##_thermal_table = .; \ 318 KEEP(*(__##name##_thermal_table)) \ 319 __##name##_thermal_table_end = .; 320 #else 321 #define THERMAL_TABLE(name) 322 #endif 323 324 #define KERNEL_DTB() \ 325 STRUCT_ALIGN(); \ 326 __dtb_start = .; \ 327 KEEP(*(.dtb.init.rodata)) \ 328 __dtb_end = .; 329 330 /* 331 * .data section 332 */ 333 #define DATA_DATA \ 334 *(.xiptext) \ 335 *(DATA_MAIN) \ 336 *(.ref.data) \ 337 *(.data..shared_aligned) /* percpu related */ \ 338 MEM_KEEP(init.data*) \ 339 MEM_KEEP(exit.data*) \ 340 *(.data.unlikely) \ 341 __start_once = .; \ 342 *(.data.once) \ 343 __end_once = .; \ 344 STRUCT_ALIGN(); \ 345 *(__tracepoints) \ 346 /* implement dynamic printk debug */ \ 347 . = ALIGN(8); \ 348 __start___dyndbg = .; \ 349 KEEP(*(__dyndbg)) \ 350 __stop___dyndbg = .; \ 351 LIKELY_PROFILE() \ 352 BRANCH_PROFILE() \ 353 TRACE_PRINTKS() \ 354 BPF_RAW_TP() \ 355 TRACEPOINT_STR() 356 357 /* 358 * Data section helpers 359 */ 360 #define NOSAVE_DATA \ 361 . = ALIGN(PAGE_SIZE); \ 362 __nosave_begin = .; \ 363 *(.data..nosave) \ 364 . = ALIGN(PAGE_SIZE); \ 365 __nosave_end = .; 366 367 #define PAGE_ALIGNED_DATA(page_align) \ 368 . = ALIGN(page_align); \ 369 *(.data..page_aligned) \ 370 . = ALIGN(page_align); 371 372 #define READ_MOSTLY_DATA(align) \ 373 . = ALIGN(align); \ 374 *(.data..read_mostly) \ 375 . = ALIGN(align); 376 377 #define CACHELINE_ALIGNED_DATA(align) \ 378 . = ALIGN(align); \ 379 *(.data..cacheline_aligned) 380 381 #define INIT_TASK_DATA(align) \ 382 . = ALIGN(align); \ 383 __start_init_task = .; \ 384 init_thread_union = .; \ 385 init_stack = .; \ 386 KEEP(*(.data..init_task)) \ 387 KEEP(*(.data..init_thread_info)) \ 388 . = __start_init_task + THREAD_SIZE; \ 389 __end_init_task = .; 390 391 #define JUMP_TABLE_DATA \ 392 . = ALIGN(8); \ 393 __start___jump_table = .; \ 394 KEEP(*(__jump_table)) \ 395 __stop___jump_table = .; 396 397 #ifdef CONFIG_HAVE_STATIC_CALL_INLINE 398 #define STATIC_CALL_DATA \ 399 . = ALIGN(8); \ 400 __start_static_call_sites = .; \ 401 KEEP(*(.static_call_sites)) \ 402 __stop_static_call_sites = .; \ 403 __start_static_call_tramp_key = .; \ 404 KEEP(*(.static_call_tramp_key)) \ 405 __stop_static_call_tramp_key = .; 406 #else 407 #define STATIC_CALL_DATA 408 #endif 409 410 /* 411 * Allow architectures to handle ro_after_init data on their 412 * own by defining an empty RO_AFTER_INIT_DATA. 413 */ 414 #ifndef RO_AFTER_INIT_DATA 415 #define RO_AFTER_INIT_DATA \ 416 . = ALIGN(8); \ 417 __start_ro_after_init = .; \ 418 *(.data..ro_after_init) \ 419 JUMP_TABLE_DATA \ 420 STATIC_CALL_DATA \ 421 __end_ro_after_init = .; 422 #endif 423 424 /* 425 * .kcfi_traps contains a list KCFI trap locations. 426 */ 427 #ifndef KCFI_TRAPS 428 #ifdef CONFIG_ARCH_USES_CFI_TRAPS 429 #define KCFI_TRAPS \ 430 __kcfi_traps : AT(ADDR(__kcfi_traps) - LOAD_OFFSET) { \ 431 __start___kcfi_traps = .; \ 432 KEEP(*(.kcfi_traps)) \ 433 __stop___kcfi_traps = .; \ 434 } 435 #else 436 #define KCFI_TRAPS 437 #endif 438 #endif 439 440 /* 441 * Read only Data 442 */ 443 #define RO_DATA(align) \ 444 . = ALIGN((align)); \ 445 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 446 __start_rodata = .; \ 447 *(.rodata) *(.rodata.*) \ 448 SCHED_DATA \ 449 RO_AFTER_INIT_DATA /* Read only after init */ \ 450 . = ALIGN(8); \ 451 __start___tracepoints_ptrs = .; \ 452 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \ 453 __stop___tracepoints_ptrs = .; \ 454 *(__tracepoints_strings)/* Tracepoints: strings */ \ 455 } \ 456 \ 457 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 458 *(.rodata1) \ 459 } \ 460 \ 461 /* PCI quirks */ \ 462 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 463 __start_pci_fixups_early = .; \ 464 KEEP(*(.pci_fixup_early)) \ 465 __end_pci_fixups_early = .; \ 466 __start_pci_fixups_header = .; \ 467 KEEP(*(.pci_fixup_header)) \ 468 __end_pci_fixups_header = .; \ 469 __start_pci_fixups_final = .; \ 470 KEEP(*(.pci_fixup_final)) \ 471 __end_pci_fixups_final = .; \ 472 __start_pci_fixups_enable = .; \ 473 KEEP(*(.pci_fixup_enable)) \ 474 __end_pci_fixups_enable = .; \ 475 __start_pci_fixups_resume = .; \ 476 KEEP(*(.pci_fixup_resume)) \ 477 __end_pci_fixups_resume = .; \ 478 __start_pci_fixups_resume_early = .; \ 479 KEEP(*(.pci_fixup_resume_early)) \ 480 __end_pci_fixups_resume_early = .; \ 481 __start_pci_fixups_suspend = .; \ 482 KEEP(*(.pci_fixup_suspend)) \ 483 __end_pci_fixups_suspend = .; \ 484 __start_pci_fixups_suspend_late = .; \ 485 KEEP(*(.pci_fixup_suspend_late)) \ 486 __end_pci_fixups_suspend_late = .; \ 487 } \ 488 \ 489 FW_LOADER_BUILT_IN_DATA \ 490 TRACEDATA \ 491 \ 492 PRINTK_INDEX \ 493 \ 494 /* Kernel symbol table: Normal symbols */ \ 495 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 496 __start___ksymtab = .; \ 497 KEEP(*(SORT(___ksymtab+*))) \ 498 __stop___ksymtab = .; \ 499 } \ 500 \ 501 /* Kernel symbol table: GPL-only symbols */ \ 502 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 503 __start___ksymtab_gpl = .; \ 504 KEEP(*(SORT(___ksymtab_gpl+*))) \ 505 __stop___ksymtab_gpl = .; \ 506 } \ 507 \ 508 /* Kernel symbol table: Normal symbols */ \ 509 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 510 __start___kcrctab = .; \ 511 KEEP(*(SORT(___kcrctab+*))) \ 512 __stop___kcrctab = .; \ 513 } \ 514 \ 515 /* Kernel symbol table: GPL-only symbols */ \ 516 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 517 __start___kcrctab_gpl = .; \ 518 KEEP(*(SORT(___kcrctab_gpl+*))) \ 519 __stop___kcrctab_gpl = .; \ 520 } \ 521 \ 522 /* Kernel symbol table: strings */ \ 523 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 524 *(__ksymtab_strings) \ 525 } \ 526 \ 527 /* __*init sections */ \ 528 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 529 *(.ref.rodata) \ 530 MEM_KEEP(init.rodata) \ 531 MEM_KEEP(exit.rodata) \ 532 } \ 533 \ 534 /* Built-in module parameters. */ \ 535 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 536 __start___param = .; \ 537 KEEP(*(__param)) \ 538 __stop___param = .; \ 539 } \ 540 \ 541 /* Built-in module versions. */ \ 542 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 543 __start___modver = .; \ 544 KEEP(*(__modver)) \ 545 __stop___modver = .; \ 546 } \ 547 \ 548 KCFI_TRAPS \ 549 \ 550 RO_EXCEPTION_TABLE \ 551 NOTES \ 552 BTF \ 553 \ 554 . = ALIGN((align)); \ 555 __end_rodata = .; 556 557 558 /* 559 * Non-instrumentable text section 560 */ 561 #define NOINSTR_TEXT \ 562 ALIGN_FUNCTION(); \ 563 __noinstr_text_start = .; \ 564 *(.noinstr.text) \ 565 __noinstr_text_end = .; 566 567 /* 568 * .text section. Map to function alignment to avoid address changes 569 * during second ld run in second ld pass when generating System.map 570 * 571 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead 572 * code elimination is enabled, so these sections should be converted 573 * to use ".." first. 574 */ 575 #define TEXT_TEXT \ 576 ALIGN_FUNCTION(); \ 577 *(.text.hot .text.hot.*) \ 578 *(TEXT_MAIN .text.fixup) \ 579 *(.text.unlikely .text.unlikely.*) \ 580 *(.text.unknown .text.unknown.*) \ 581 NOINSTR_TEXT \ 582 *(.text..refcount) \ 583 *(.ref.text) \ 584 *(.text.asan.* .text.tsan.*) \ 585 MEM_KEEP(init.text*) \ 586 MEM_KEEP(exit.text*) \ 587 588 589 /* sched.text is aling to function alignment to secure we have same 590 * address even at second ld pass when generating System.map */ 591 #define SCHED_TEXT \ 592 ALIGN_FUNCTION(); \ 593 __sched_text_start = .; \ 594 *(.sched.text) \ 595 __sched_text_end = .; 596 597 /* spinlock.text is aling to function alignment to secure we have same 598 * address even at second ld pass when generating System.map */ 599 #define LOCK_TEXT \ 600 ALIGN_FUNCTION(); \ 601 __lock_text_start = .; \ 602 *(.spinlock.text) \ 603 __lock_text_end = .; 604 605 #define CPUIDLE_TEXT \ 606 ALIGN_FUNCTION(); \ 607 __cpuidle_text_start = .; \ 608 *(.cpuidle.text) \ 609 __cpuidle_text_end = .; 610 611 #define KPROBES_TEXT \ 612 ALIGN_FUNCTION(); \ 613 __kprobes_text_start = .; \ 614 *(.kprobes.text) \ 615 __kprobes_text_end = .; 616 617 #define ENTRY_TEXT \ 618 ALIGN_FUNCTION(); \ 619 __entry_text_start = .; \ 620 *(.entry.text) \ 621 __entry_text_end = .; 622 623 #define IRQENTRY_TEXT \ 624 ALIGN_FUNCTION(); \ 625 __irqentry_text_start = .; \ 626 *(.irqentry.text) \ 627 __irqentry_text_end = .; 628 629 #define SOFTIRQENTRY_TEXT \ 630 ALIGN_FUNCTION(); \ 631 __softirqentry_text_start = .; \ 632 *(.softirqentry.text) \ 633 __softirqentry_text_end = .; 634 635 #define STATIC_CALL_TEXT \ 636 ALIGN_FUNCTION(); \ 637 __static_call_text_start = .; \ 638 *(.static_call.text) \ 639 __static_call_text_end = .; 640 641 /* Section used for early init (in .S files) */ 642 #define HEAD_TEXT KEEP(*(.head.text)) 643 644 #define HEAD_TEXT_SECTION \ 645 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 646 HEAD_TEXT \ 647 } 648 649 /* 650 * Exception table 651 */ 652 #define EXCEPTION_TABLE(align) \ 653 . = ALIGN(align); \ 654 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 655 __start___ex_table = .; \ 656 KEEP(*(__ex_table)) \ 657 __stop___ex_table = .; \ 658 } 659 660 /* 661 * .BTF 662 */ 663 #ifdef CONFIG_DEBUG_INFO_BTF 664 #define BTF \ 665 .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \ 666 __start_BTF = .; \ 667 KEEP(*(.BTF)) \ 668 __stop_BTF = .; \ 669 } \ 670 . = ALIGN(4); \ 671 .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) { \ 672 *(.BTF_ids) \ 673 } 674 #else 675 #define BTF 676 #endif 677 678 /* 679 * Init task 680 */ 681 #define INIT_TASK_DATA_SECTION(align) \ 682 . = ALIGN(align); \ 683 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 684 INIT_TASK_DATA(align) \ 685 } 686 687 #ifdef CONFIG_CONSTRUCTORS 688 #define KERNEL_CTORS() . = ALIGN(8); \ 689 __ctors_start = .; \ 690 KEEP(*(SORT(.ctors.*))) \ 691 KEEP(*(.ctors)) \ 692 KEEP(*(SORT(.init_array.*))) \ 693 KEEP(*(.init_array)) \ 694 __ctors_end = .; 695 #else 696 #define KERNEL_CTORS() 697 #endif 698 699 /* init and exit section handling */ 700 #define INIT_DATA \ 701 KEEP(*(SORT(___kentry+*))) \ 702 *(.init.data init.data.*) \ 703 MEM_DISCARD(init.data*) \ 704 KERNEL_CTORS() \ 705 MCOUNT_REC() \ 706 *(.init.rodata .init.rodata.*) \ 707 FTRACE_EVENTS() \ 708 TRACE_SYSCALLS() \ 709 KPROBE_BLACKLIST() \ 710 ERROR_INJECT_WHITELIST() \ 711 MEM_DISCARD(init.rodata) \ 712 CLK_OF_TABLES() \ 713 RESERVEDMEM_OF_TABLES() \ 714 TIMER_OF_TABLES() \ 715 CPU_METHOD_OF_TABLES() \ 716 CPUIDLE_METHOD_OF_TABLES() \ 717 KERNEL_DTB() \ 718 IRQCHIP_OF_MATCH_TABLE() \ 719 ACPI_PROBE_TABLE(irqchip) \ 720 ACPI_PROBE_TABLE(timer) \ 721 THERMAL_TABLE(governor) \ 722 EARLYCON_TABLE() \ 723 LSM_TABLE() \ 724 EARLY_LSM_TABLE() \ 725 KUNIT_TABLE() 726 727 #define INIT_TEXT \ 728 *(.init.text .init.text.*) \ 729 *(.text.startup) \ 730 MEM_DISCARD(init.text*) 731 732 #define EXIT_DATA \ 733 *(.exit.data .exit.data.*) \ 734 *(.fini_array .fini_array.*) \ 735 *(.dtors .dtors.*) \ 736 MEM_DISCARD(exit.data*) \ 737 MEM_DISCARD(exit.rodata*) 738 739 #define EXIT_TEXT \ 740 *(.exit.text) \ 741 *(.text.exit) \ 742 MEM_DISCARD(exit.text) 743 744 #define EXIT_CALL \ 745 *(.exitcall.exit) 746 747 /* 748 * bss (Block Started by Symbol) - uninitialized data 749 * zeroed during startup 750 */ 751 #define SBSS(sbss_align) \ 752 . = ALIGN(sbss_align); \ 753 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 754 *(.dynsbss) \ 755 *(SBSS_MAIN) \ 756 *(.scommon) \ 757 } 758 759 /* 760 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 761 * sections to the front of bss. 762 */ 763 #ifndef BSS_FIRST_SECTIONS 764 #define BSS_FIRST_SECTIONS 765 #endif 766 767 #define BSS(bss_align) \ 768 . = ALIGN(bss_align); \ 769 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 770 BSS_FIRST_SECTIONS \ 771 . = ALIGN(PAGE_SIZE); \ 772 *(.bss..page_aligned) \ 773 . = ALIGN(PAGE_SIZE); \ 774 *(.dynbss) \ 775 *(BSS_MAIN) \ 776 *(COMMON) \ 777 } 778 779 /* 780 * DWARF debug sections. 781 * Symbols in the DWARF debugging sections are relative to 782 * the beginning of the section so we begin them at 0. 783 */ 784 #define DWARF_DEBUG \ 785 /* DWARF 1 */ \ 786 .debug 0 : { *(.debug) } \ 787 .line 0 : { *(.line) } \ 788 /* GNU DWARF 1 extensions */ \ 789 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 790 .debug_sfnames 0 : { *(.debug_sfnames) } \ 791 /* DWARF 1.1 and DWARF 2 */ \ 792 .debug_aranges 0 : { *(.debug_aranges) } \ 793 .debug_pubnames 0 : { *(.debug_pubnames) } \ 794 /* DWARF 2 */ \ 795 .debug_info 0 : { *(.debug_info \ 796 .gnu.linkonce.wi.*) } \ 797 .debug_abbrev 0 : { *(.debug_abbrev) } \ 798 .debug_line 0 : { *(.debug_line) } \ 799 .debug_frame 0 : { *(.debug_frame) } \ 800 .debug_str 0 : { *(.debug_str) } \ 801 .debug_loc 0 : { *(.debug_loc) } \ 802 .debug_macinfo 0 : { *(.debug_macinfo) } \ 803 .debug_pubtypes 0 : { *(.debug_pubtypes) } \ 804 /* DWARF 3 */ \ 805 .debug_ranges 0 : { *(.debug_ranges) } \ 806 /* SGI/MIPS DWARF 2 extensions */ \ 807 .debug_weaknames 0 : { *(.debug_weaknames) } \ 808 .debug_funcnames 0 : { *(.debug_funcnames) } \ 809 .debug_typenames 0 : { *(.debug_typenames) } \ 810 .debug_varnames 0 : { *(.debug_varnames) } \ 811 /* GNU DWARF 2 extensions */ \ 812 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \ 813 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \ 814 /* DWARF 4 */ \ 815 .debug_types 0 : { *(.debug_types) } \ 816 /* DWARF 5 */ \ 817 .debug_addr 0 : { *(.debug_addr) } \ 818 .debug_line_str 0 : { *(.debug_line_str) } \ 819 .debug_loclists 0 : { *(.debug_loclists) } \ 820 .debug_macro 0 : { *(.debug_macro) } \ 821 .debug_names 0 : { *(.debug_names) } \ 822 .debug_rnglists 0 : { *(.debug_rnglists) } \ 823 .debug_str_offsets 0 : { *(.debug_str_offsets) } 824 825 /* Stabs debugging sections. */ 826 #define STABS_DEBUG \ 827 .stab 0 : { *(.stab) } \ 828 .stabstr 0 : { *(.stabstr) } \ 829 .stab.excl 0 : { *(.stab.excl) } \ 830 .stab.exclstr 0 : { *(.stab.exclstr) } \ 831 .stab.index 0 : { *(.stab.index) } \ 832 .stab.indexstr 0 : { *(.stab.indexstr) } 833 834 /* Required sections not related to debugging. */ 835 #define ELF_DETAILS \ 836 .comment 0 : { *(.comment) } \ 837 .symtab 0 : { *(.symtab) } \ 838 .strtab 0 : { *(.strtab) } \ 839 .shstrtab 0 : { *(.shstrtab) } 840 841 #ifdef CONFIG_GENERIC_BUG 842 #define BUG_TABLE \ 843 . = ALIGN(8); \ 844 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 845 __start___bug_table = .; \ 846 KEEP(*(__bug_table)) \ 847 __stop___bug_table = .; \ 848 } 849 #else 850 #define BUG_TABLE 851 #endif 852 853 #ifdef CONFIG_UNWINDER_ORC 854 #define ORC_UNWIND_TABLE \ 855 . = ALIGN(4); \ 856 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \ 857 __start_orc_unwind_ip = .; \ 858 KEEP(*(.orc_unwind_ip)) \ 859 __stop_orc_unwind_ip = .; \ 860 } \ 861 . = ALIGN(2); \ 862 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \ 863 __start_orc_unwind = .; \ 864 KEEP(*(.orc_unwind)) \ 865 __stop_orc_unwind = .; \ 866 } \ 867 text_size = _etext - _stext; \ 868 . = ALIGN(4); \ 869 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \ 870 orc_lookup = .; \ 871 . += (((text_size + LOOKUP_BLOCK_SIZE - 1) / \ 872 LOOKUP_BLOCK_SIZE) + 1) * 4; \ 873 orc_lookup_end = .; \ 874 } 875 #else 876 #define ORC_UNWIND_TABLE 877 #endif 878 879 /* Built-in firmware blobs */ 880 #ifdef CONFIG_FW_LOADER 881 #define FW_LOADER_BUILT_IN_DATA \ 882 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) { \ 883 __start_builtin_fw = .; \ 884 KEEP(*(.builtin_fw)) \ 885 __end_builtin_fw = .; \ 886 } 887 #else 888 #define FW_LOADER_BUILT_IN_DATA 889 #endif 890 891 #ifdef CONFIG_PM_TRACE 892 #define TRACEDATA \ 893 . = ALIGN(4); \ 894 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 895 __tracedata_start = .; \ 896 KEEP(*(.tracedata)) \ 897 __tracedata_end = .; \ 898 } 899 #else 900 #define TRACEDATA 901 #endif 902 903 #ifdef CONFIG_PRINTK_INDEX 904 #define PRINTK_INDEX \ 905 .printk_index : AT(ADDR(.printk_index) - LOAD_OFFSET) { \ 906 __start_printk_index = .; \ 907 *(.printk_index) \ 908 __stop_printk_index = .; \ 909 } 910 #else 911 #define PRINTK_INDEX 912 #endif 913 914 #define NOTES \ 915 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 916 __start_notes = .; \ 917 KEEP(*(.note.*)) \ 918 __stop_notes = .; \ 919 } NOTES_HEADERS \ 920 NOTES_HEADERS_RESTORE 921 922 #define INIT_SETUP(initsetup_align) \ 923 . = ALIGN(initsetup_align); \ 924 __setup_start = .; \ 925 KEEP(*(.init.setup)) \ 926 __setup_end = .; 927 928 #define INIT_CALLS_LEVEL(level) \ 929 __initcall##level##_start = .; \ 930 KEEP(*(.initcall##level##.init)) \ 931 KEEP(*(.initcall##level##s.init)) \ 932 933 #define INIT_CALLS \ 934 __initcall_start = .; \ 935 KEEP(*(.initcallearly.init)) \ 936 INIT_CALLS_LEVEL(0) \ 937 INIT_CALLS_LEVEL(1) \ 938 INIT_CALLS_LEVEL(2) \ 939 INIT_CALLS_LEVEL(3) \ 940 INIT_CALLS_LEVEL(4) \ 941 INIT_CALLS_LEVEL(5) \ 942 INIT_CALLS_LEVEL(rootfs) \ 943 INIT_CALLS_LEVEL(6) \ 944 INIT_CALLS_LEVEL(7) \ 945 __initcall_end = .; 946 947 #define CON_INITCALL \ 948 __con_initcall_start = .; \ 949 KEEP(*(.con_initcall.init)) \ 950 __con_initcall_end = .; 951 952 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */ 953 #define KUNIT_TABLE() \ 954 . = ALIGN(8); \ 955 __kunit_suites_start = .; \ 956 KEEP(*(.kunit_test_suites)) \ 957 __kunit_suites_end = .; 958 959 #ifdef CONFIG_BLK_DEV_INITRD 960 #define INIT_RAM_FS \ 961 . = ALIGN(4); \ 962 __initramfs_start = .; \ 963 KEEP(*(.init.ramfs)) \ 964 . = ALIGN(8); \ 965 KEEP(*(.init.ramfs.info)) 966 #else 967 #define INIT_RAM_FS 968 #endif 969 970 /* 971 * Memory encryption operates on a page basis. Since we need to clear 972 * the memory encryption mask for this section, it needs to be aligned 973 * on a page boundary and be a page-size multiple in length. 974 * 975 * Note: We use a separate section so that only this section gets 976 * decrypted to avoid exposing more than we wish. 977 */ 978 #ifdef CONFIG_AMD_MEM_ENCRYPT 979 #define PERCPU_DECRYPTED_SECTION \ 980 . = ALIGN(PAGE_SIZE); \ 981 *(.data..decrypted) \ 982 *(.data..percpu..decrypted) \ 983 . = ALIGN(PAGE_SIZE); 984 #else 985 #define PERCPU_DECRYPTED_SECTION 986 #endif 987 988 989 /* 990 * Default discarded sections. 991 * 992 * Some archs want to discard exit text/data at runtime rather than 993 * link time due to cross-section references such as alt instructions, 994 * bug table, eh_frame, etc. DISCARDS must be the last of output 995 * section definitions so that such archs put those in earlier section 996 * definitions. 997 */ 998 #ifdef RUNTIME_DISCARD_EXIT 999 #define EXIT_DISCARDS 1000 #else 1001 #define EXIT_DISCARDS \ 1002 EXIT_TEXT \ 1003 EXIT_DATA 1004 #endif 1005 1006 /* 1007 * Clang's -fprofile-arcs, -fsanitize=kernel-address, and 1008 * -fsanitize=thread produce unwanted sections (.eh_frame 1009 * and .init_array.*), but CONFIG_CONSTRUCTORS wants to 1010 * keep any .init_array.* sections. 1011 * https://bugs.llvm.org/show_bug.cgi?id=46478 1012 */ 1013 #if defined(CONFIG_GCOV_KERNEL) || defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN) 1014 # ifdef CONFIG_CONSTRUCTORS 1015 # define SANITIZER_DISCARDS \ 1016 *(.eh_frame) 1017 # else 1018 # define SANITIZER_DISCARDS \ 1019 *(.init_array) *(.init_array.*) \ 1020 *(.eh_frame) 1021 # endif 1022 #else 1023 # define SANITIZER_DISCARDS 1024 #endif 1025 1026 #define COMMON_DISCARDS \ 1027 SANITIZER_DISCARDS \ 1028 *(.discard) \ 1029 *(.discard.*) \ 1030 *(.modinfo) \ 1031 /* ld.bfd warns about .gnu.version* even when not emitted */ \ 1032 *(.gnu.version*) \ 1033 1034 #define DISCARDS \ 1035 /DISCARD/ : { \ 1036 EXIT_DISCARDS \ 1037 EXIT_CALL \ 1038 COMMON_DISCARDS \ 1039 } 1040 1041 /** 1042 * PERCPU_INPUT - the percpu input sections 1043 * @cacheline: cacheline size 1044 * 1045 * The core percpu section names and core symbols which do not rely 1046 * directly upon load addresses. 1047 * 1048 * @cacheline is used to align subsections to avoid false cacheline 1049 * sharing between subsections for different purposes. 1050 */ 1051 #define PERCPU_INPUT(cacheline) \ 1052 __per_cpu_start = .; \ 1053 *(.data..percpu..first) \ 1054 . = ALIGN(PAGE_SIZE); \ 1055 *(.data..percpu..page_aligned) \ 1056 . = ALIGN(cacheline); \ 1057 *(.data..percpu..read_mostly) \ 1058 . = ALIGN(cacheline); \ 1059 *(.data..percpu) \ 1060 *(.data..percpu..shared_aligned) \ 1061 PERCPU_DECRYPTED_SECTION \ 1062 __per_cpu_end = .; 1063 1064 /** 1065 * PERCPU_VADDR - define output section for percpu area 1066 * @cacheline: cacheline size 1067 * @vaddr: explicit base address (optional) 1068 * @phdr: destination PHDR (optional) 1069 * 1070 * Macro which expands to output section for percpu area. 1071 * 1072 * @cacheline is used to align subsections to avoid false cacheline 1073 * sharing between subsections for different purposes. 1074 * 1075 * If @vaddr is not blank, it specifies explicit base address and all 1076 * percpu symbols will be offset from the given address. If blank, 1077 * @vaddr always equals @laddr + LOAD_OFFSET. 1078 * 1079 * @phdr defines the output PHDR to use if not blank. Be warned that 1080 * output PHDR is sticky. If @phdr is specified, the next output 1081 * section in the linker script will go there too. @phdr should have 1082 * a leading colon. 1083 * 1084 * Note that this macros defines __per_cpu_load as an absolute symbol. 1085 * If there is no need to put the percpu section at a predetermined 1086 * address, use PERCPU_SECTION. 1087 */ 1088 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 1089 __per_cpu_load = .; \ 1090 .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \ 1091 PERCPU_INPUT(cacheline) \ 1092 } phdr \ 1093 . = __per_cpu_load + SIZEOF(.data..percpu); 1094 1095 /** 1096 * PERCPU_SECTION - define output section for percpu area, simple version 1097 * @cacheline: cacheline size 1098 * 1099 * Align to PAGE_SIZE and outputs output section for percpu area. This 1100 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 1101 * __per_cpu_start will be identical. 1102 * 1103 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 1104 * except that __per_cpu_load is defined as a relative symbol against 1105 * .data..percpu which is required for relocatable x86_32 configuration. 1106 */ 1107 #define PERCPU_SECTION(cacheline) \ 1108 . = ALIGN(PAGE_SIZE); \ 1109 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 1110 __per_cpu_load = .; \ 1111 PERCPU_INPUT(cacheline) \ 1112 } 1113 1114 1115 /* 1116 * Definition of the high level *_SECTION macros 1117 * They will fit only a subset of the architectures 1118 */ 1119 1120 1121 /* 1122 * Writeable data. 1123 * All sections are combined in a single .data section. 1124 * The sections following CONSTRUCTORS are arranged so their 1125 * typical alignment matches. 1126 * A cacheline is typical/always less than a PAGE_SIZE so 1127 * the sections that has this restriction (or similar) 1128 * is located before the ones requiring PAGE_SIZE alignment. 1129 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 1130 * matches the requirement of PAGE_ALIGNED_DATA. 1131 * 1132 * use 0 as page_align if page_aligned data is not used */ 1133 #define RW_DATA(cacheline, pagealigned, inittask) \ 1134 . = ALIGN(PAGE_SIZE); \ 1135 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 1136 INIT_TASK_DATA(inittask) \ 1137 NOSAVE_DATA \ 1138 PAGE_ALIGNED_DATA(pagealigned) \ 1139 CACHELINE_ALIGNED_DATA(cacheline) \ 1140 READ_MOSTLY_DATA(cacheline) \ 1141 DATA_DATA \ 1142 CONSTRUCTORS \ 1143 } \ 1144 BUG_TABLE \ 1145 1146 #define INIT_TEXT_SECTION(inittext_align) \ 1147 . = ALIGN(inittext_align); \ 1148 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 1149 _sinittext = .; \ 1150 INIT_TEXT \ 1151 _einittext = .; \ 1152 } 1153 1154 #define INIT_DATA_SECTION(initsetup_align) \ 1155 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 1156 INIT_DATA \ 1157 INIT_SETUP(initsetup_align) \ 1158 INIT_CALLS \ 1159 CON_INITCALL \ 1160 INIT_RAM_FS \ 1161 } 1162 1163 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 1164 . = ALIGN(sbss_align); \ 1165 __bss_start = .; \ 1166 SBSS(sbss_align) \ 1167 BSS(bss_align) \ 1168 . = ALIGN(stop_align); \ 1169 __bss_stop = .; 1170