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 * Read only Data 426 */ 427 #define RO_DATA(align) \ 428 . = ALIGN((align)); \ 429 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 430 __start_rodata = .; \ 431 *(.rodata) *(.rodata.*) \ 432 SCHED_DATA \ 433 RO_AFTER_INIT_DATA /* Read only after init */ \ 434 . = ALIGN(8); \ 435 __start___tracepoints_ptrs = .; \ 436 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \ 437 __stop___tracepoints_ptrs = .; \ 438 *(__tracepoints_strings)/* Tracepoints: strings */ \ 439 } \ 440 \ 441 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 442 *(.rodata1) \ 443 } \ 444 \ 445 /* PCI quirks */ \ 446 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 447 __start_pci_fixups_early = .; \ 448 KEEP(*(.pci_fixup_early)) \ 449 __end_pci_fixups_early = .; \ 450 __start_pci_fixups_header = .; \ 451 KEEP(*(.pci_fixup_header)) \ 452 __end_pci_fixups_header = .; \ 453 __start_pci_fixups_final = .; \ 454 KEEP(*(.pci_fixup_final)) \ 455 __end_pci_fixups_final = .; \ 456 __start_pci_fixups_enable = .; \ 457 KEEP(*(.pci_fixup_enable)) \ 458 __end_pci_fixups_enable = .; \ 459 __start_pci_fixups_resume = .; \ 460 KEEP(*(.pci_fixup_resume)) \ 461 __end_pci_fixups_resume = .; \ 462 __start_pci_fixups_resume_early = .; \ 463 KEEP(*(.pci_fixup_resume_early)) \ 464 __end_pci_fixups_resume_early = .; \ 465 __start_pci_fixups_suspend = .; \ 466 KEEP(*(.pci_fixup_suspend)) \ 467 __end_pci_fixups_suspend = .; \ 468 __start_pci_fixups_suspend_late = .; \ 469 KEEP(*(.pci_fixup_suspend_late)) \ 470 __end_pci_fixups_suspend_late = .; \ 471 } \ 472 \ 473 FW_LOADER_BUILT_IN_DATA \ 474 TRACEDATA \ 475 \ 476 PRINTK_INDEX \ 477 \ 478 /* Kernel symbol table: Normal symbols */ \ 479 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 480 __start___ksymtab = .; \ 481 KEEP(*(SORT(___ksymtab+*))) \ 482 __stop___ksymtab = .; \ 483 } \ 484 \ 485 /* Kernel symbol table: GPL-only symbols */ \ 486 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 487 __start___ksymtab_gpl = .; \ 488 KEEP(*(SORT(___ksymtab_gpl+*))) \ 489 __stop___ksymtab_gpl = .; \ 490 } \ 491 \ 492 /* Kernel symbol table: Normal symbols */ \ 493 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 494 __start___kcrctab = .; \ 495 KEEP(*(SORT(___kcrctab+*))) \ 496 __stop___kcrctab = .; \ 497 } \ 498 \ 499 /* Kernel symbol table: GPL-only symbols */ \ 500 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 501 __start___kcrctab_gpl = .; \ 502 KEEP(*(SORT(___kcrctab_gpl+*))) \ 503 __stop___kcrctab_gpl = .; \ 504 } \ 505 \ 506 /* Kernel symbol table: strings */ \ 507 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 508 *(__ksymtab_strings) \ 509 } \ 510 \ 511 /* __*init sections */ \ 512 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 513 *(.ref.rodata) \ 514 MEM_KEEP(init.rodata) \ 515 MEM_KEEP(exit.rodata) \ 516 } \ 517 \ 518 /* Built-in module parameters. */ \ 519 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 520 __start___param = .; \ 521 KEEP(*(__param)) \ 522 __stop___param = .; \ 523 } \ 524 \ 525 /* Built-in module versions. */ \ 526 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 527 __start___modver = .; \ 528 KEEP(*(__modver)) \ 529 __stop___modver = .; \ 530 } \ 531 \ 532 RO_EXCEPTION_TABLE \ 533 NOTES \ 534 BTF \ 535 \ 536 . = ALIGN((align)); \ 537 __end_rodata = .; 538 539 540 /* 541 * .text..L.cfi.jumptable.* contain Control-Flow Integrity (CFI) 542 * jump table entries. 543 */ 544 #ifdef CONFIG_CFI_CLANG 545 #define TEXT_CFI_JT \ 546 . = ALIGN(PMD_SIZE); \ 547 __cfi_jt_start = .; \ 548 *(.text..L.cfi.jumptable .text..L.cfi.jumptable.*) \ 549 . = ALIGN(PMD_SIZE); \ 550 __cfi_jt_end = .; 551 #else 552 #define TEXT_CFI_JT 553 #endif 554 555 /* 556 * Non-instrumentable text section 557 */ 558 #define NOINSTR_TEXT \ 559 ALIGN_FUNCTION(); \ 560 __noinstr_text_start = .; \ 561 *(.noinstr.text) \ 562 __noinstr_text_end = .; 563 564 /* 565 * .text section. Map to function alignment to avoid address changes 566 * during second ld run in second ld pass when generating System.map 567 * 568 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead 569 * code elimination is enabled, so these sections should be converted 570 * to use ".." first. 571 */ 572 #define TEXT_TEXT \ 573 ALIGN_FUNCTION(); \ 574 *(.text.hot .text.hot.*) \ 575 *(TEXT_MAIN .text.fixup) \ 576 *(.text.unlikely .text.unlikely.*) \ 577 *(.text.unknown .text.unknown.*) \ 578 NOINSTR_TEXT \ 579 *(.text..refcount) \ 580 *(.ref.text) \ 581 *(.text.asan.* .text.tsan.*) \ 582 TEXT_CFI_JT \ 583 MEM_KEEP(init.text*) \ 584 MEM_KEEP(exit.text*) \ 585 586 587 /* sched.text is aling to function alignment to secure we have same 588 * address even at second ld pass when generating System.map */ 589 #define SCHED_TEXT \ 590 ALIGN_FUNCTION(); \ 591 __sched_text_start = .; \ 592 *(.sched.text) \ 593 __sched_text_end = .; 594 595 /* spinlock.text is aling to function alignment to secure we have same 596 * address even at second ld pass when generating System.map */ 597 #define LOCK_TEXT \ 598 ALIGN_FUNCTION(); \ 599 __lock_text_start = .; \ 600 *(.spinlock.text) \ 601 __lock_text_end = .; 602 603 #define CPUIDLE_TEXT \ 604 ALIGN_FUNCTION(); \ 605 __cpuidle_text_start = .; \ 606 *(.cpuidle.text) \ 607 __cpuidle_text_end = .; 608 609 #define KPROBES_TEXT \ 610 ALIGN_FUNCTION(); \ 611 __kprobes_text_start = .; \ 612 *(.kprobes.text) \ 613 __kprobes_text_end = .; 614 615 #define ENTRY_TEXT \ 616 ALIGN_FUNCTION(); \ 617 __entry_text_start = .; \ 618 *(.entry.text) \ 619 __entry_text_end = .; 620 621 #define IRQENTRY_TEXT \ 622 ALIGN_FUNCTION(); \ 623 __irqentry_text_start = .; \ 624 *(.irqentry.text) \ 625 __irqentry_text_end = .; 626 627 #define SOFTIRQENTRY_TEXT \ 628 ALIGN_FUNCTION(); \ 629 __softirqentry_text_start = .; \ 630 *(.softirqentry.text) \ 631 __softirqentry_text_end = .; 632 633 #define STATIC_CALL_TEXT \ 634 ALIGN_FUNCTION(); \ 635 __static_call_text_start = .; \ 636 *(.static_call.text) \ 637 __static_call_text_end = .; 638 639 /* Section used for early init (in .S files) */ 640 #define HEAD_TEXT KEEP(*(.head.text)) 641 642 #define HEAD_TEXT_SECTION \ 643 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 644 HEAD_TEXT \ 645 } 646 647 /* 648 * Exception table 649 */ 650 #define EXCEPTION_TABLE(align) \ 651 . = ALIGN(align); \ 652 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 653 __start___ex_table = .; \ 654 KEEP(*(__ex_table)) \ 655 __stop___ex_table = .; \ 656 } 657 658 /* 659 * .BTF 660 */ 661 #ifdef CONFIG_DEBUG_INFO_BTF 662 #define BTF \ 663 .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \ 664 __start_BTF = .; \ 665 KEEP(*(.BTF)) \ 666 __stop_BTF = .; \ 667 } \ 668 . = ALIGN(4); \ 669 .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) { \ 670 *(.BTF_ids) \ 671 } 672 #else 673 #define BTF 674 #endif 675 676 /* 677 * Init task 678 */ 679 #define INIT_TASK_DATA_SECTION(align) \ 680 . = ALIGN(align); \ 681 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 682 INIT_TASK_DATA(align) \ 683 } 684 685 #ifdef CONFIG_CONSTRUCTORS 686 #define KERNEL_CTORS() . = ALIGN(8); \ 687 __ctors_start = .; \ 688 KEEP(*(SORT(.ctors.*))) \ 689 KEEP(*(.ctors)) \ 690 KEEP(*(SORT(.init_array.*))) \ 691 KEEP(*(.init_array)) \ 692 __ctors_end = .; 693 #else 694 #define KERNEL_CTORS() 695 #endif 696 697 /* init and exit section handling */ 698 #define INIT_DATA \ 699 KEEP(*(SORT(___kentry+*))) \ 700 *(.init.data init.data.*) \ 701 MEM_DISCARD(init.data*) \ 702 KERNEL_CTORS() \ 703 MCOUNT_REC() \ 704 *(.init.rodata .init.rodata.*) \ 705 FTRACE_EVENTS() \ 706 TRACE_SYSCALLS() \ 707 KPROBE_BLACKLIST() \ 708 ERROR_INJECT_WHITELIST() \ 709 MEM_DISCARD(init.rodata) \ 710 CLK_OF_TABLES() \ 711 RESERVEDMEM_OF_TABLES() \ 712 TIMER_OF_TABLES() \ 713 CPU_METHOD_OF_TABLES() \ 714 CPUIDLE_METHOD_OF_TABLES() \ 715 KERNEL_DTB() \ 716 IRQCHIP_OF_MATCH_TABLE() \ 717 ACPI_PROBE_TABLE(irqchip) \ 718 ACPI_PROBE_TABLE(timer) \ 719 THERMAL_TABLE(governor) \ 720 EARLYCON_TABLE() \ 721 LSM_TABLE() \ 722 EARLY_LSM_TABLE() \ 723 KUNIT_TABLE() 724 725 #define INIT_TEXT \ 726 *(.init.text .init.text.*) \ 727 *(.text.startup) \ 728 MEM_DISCARD(init.text*) 729 730 #define EXIT_DATA \ 731 *(.exit.data .exit.data.*) \ 732 *(.fini_array .fini_array.*) \ 733 *(.dtors .dtors.*) \ 734 MEM_DISCARD(exit.data*) \ 735 MEM_DISCARD(exit.rodata*) 736 737 #define EXIT_TEXT \ 738 *(.exit.text) \ 739 *(.text.exit) \ 740 MEM_DISCARD(exit.text) 741 742 #define EXIT_CALL \ 743 *(.exitcall.exit) 744 745 /* 746 * bss (Block Started by Symbol) - uninitialized data 747 * zeroed during startup 748 */ 749 #define SBSS(sbss_align) \ 750 . = ALIGN(sbss_align); \ 751 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 752 *(.dynsbss) \ 753 *(SBSS_MAIN) \ 754 *(.scommon) \ 755 } 756 757 /* 758 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 759 * sections to the front of bss. 760 */ 761 #ifndef BSS_FIRST_SECTIONS 762 #define BSS_FIRST_SECTIONS 763 #endif 764 765 #define BSS(bss_align) \ 766 . = ALIGN(bss_align); \ 767 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 768 BSS_FIRST_SECTIONS \ 769 . = ALIGN(PAGE_SIZE); \ 770 *(.bss..page_aligned) \ 771 . = ALIGN(PAGE_SIZE); \ 772 *(.dynbss) \ 773 *(BSS_MAIN) \ 774 *(COMMON) \ 775 } 776 777 /* 778 * DWARF debug sections. 779 * Symbols in the DWARF debugging sections are relative to 780 * the beginning of the section so we begin them at 0. 781 */ 782 #define DWARF_DEBUG \ 783 /* DWARF 1 */ \ 784 .debug 0 : { *(.debug) } \ 785 .line 0 : { *(.line) } \ 786 /* GNU DWARF 1 extensions */ \ 787 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 788 .debug_sfnames 0 : { *(.debug_sfnames) } \ 789 /* DWARF 1.1 and DWARF 2 */ \ 790 .debug_aranges 0 : { *(.debug_aranges) } \ 791 .debug_pubnames 0 : { *(.debug_pubnames) } \ 792 /* DWARF 2 */ \ 793 .debug_info 0 : { *(.debug_info \ 794 .gnu.linkonce.wi.*) } \ 795 .debug_abbrev 0 : { *(.debug_abbrev) } \ 796 .debug_line 0 : { *(.debug_line) } \ 797 .debug_frame 0 : { *(.debug_frame) } \ 798 .debug_str 0 : { *(.debug_str) } \ 799 .debug_loc 0 : { *(.debug_loc) } \ 800 .debug_macinfo 0 : { *(.debug_macinfo) } \ 801 .debug_pubtypes 0 : { *(.debug_pubtypes) } \ 802 /* DWARF 3 */ \ 803 .debug_ranges 0 : { *(.debug_ranges) } \ 804 /* SGI/MIPS DWARF 2 extensions */ \ 805 .debug_weaknames 0 : { *(.debug_weaknames) } \ 806 .debug_funcnames 0 : { *(.debug_funcnames) } \ 807 .debug_typenames 0 : { *(.debug_typenames) } \ 808 .debug_varnames 0 : { *(.debug_varnames) } \ 809 /* GNU DWARF 2 extensions */ \ 810 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \ 811 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \ 812 /* DWARF 4 */ \ 813 .debug_types 0 : { *(.debug_types) } \ 814 /* DWARF 5 */ \ 815 .debug_addr 0 : { *(.debug_addr) } \ 816 .debug_line_str 0 : { *(.debug_line_str) } \ 817 .debug_loclists 0 : { *(.debug_loclists) } \ 818 .debug_macro 0 : { *(.debug_macro) } \ 819 .debug_names 0 : { *(.debug_names) } \ 820 .debug_rnglists 0 : { *(.debug_rnglists) } \ 821 .debug_str_offsets 0 : { *(.debug_str_offsets) } 822 823 /* Stabs debugging sections. */ 824 #define STABS_DEBUG \ 825 .stab 0 : { *(.stab) } \ 826 .stabstr 0 : { *(.stabstr) } \ 827 .stab.excl 0 : { *(.stab.excl) } \ 828 .stab.exclstr 0 : { *(.stab.exclstr) } \ 829 .stab.index 0 : { *(.stab.index) } \ 830 .stab.indexstr 0 : { *(.stab.indexstr) } 831 832 /* Required sections not related to debugging. */ 833 #define ELF_DETAILS \ 834 .comment 0 : { *(.comment) } \ 835 .symtab 0 : { *(.symtab) } \ 836 .strtab 0 : { *(.strtab) } \ 837 .shstrtab 0 : { *(.shstrtab) } 838 839 #ifdef CONFIG_GENERIC_BUG 840 #define BUG_TABLE \ 841 . = ALIGN(8); \ 842 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 843 __start___bug_table = .; \ 844 KEEP(*(__bug_table)) \ 845 __stop___bug_table = .; \ 846 } 847 #else 848 #define BUG_TABLE 849 #endif 850 851 #ifdef CONFIG_UNWINDER_ORC 852 #define ORC_UNWIND_TABLE \ 853 . = ALIGN(4); \ 854 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \ 855 __start_orc_unwind_ip = .; \ 856 KEEP(*(.orc_unwind_ip)) \ 857 __stop_orc_unwind_ip = .; \ 858 } \ 859 . = ALIGN(2); \ 860 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \ 861 __start_orc_unwind = .; \ 862 KEEP(*(.orc_unwind)) \ 863 __stop_orc_unwind = .; \ 864 } \ 865 text_size = _etext - _stext; \ 866 . = ALIGN(4); \ 867 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \ 868 orc_lookup = .; \ 869 . += (((text_size + LOOKUP_BLOCK_SIZE - 1) / \ 870 LOOKUP_BLOCK_SIZE) + 1) * 4; \ 871 orc_lookup_end = .; \ 872 } 873 #else 874 #define ORC_UNWIND_TABLE 875 #endif 876 877 /* Built-in firmware blobs */ 878 #ifdef CONFIG_FW_LOADER 879 #define FW_LOADER_BUILT_IN_DATA \ 880 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) { \ 881 __start_builtin_fw = .; \ 882 KEEP(*(.builtin_fw)) \ 883 __end_builtin_fw = .; \ 884 } 885 #else 886 #define FW_LOADER_BUILT_IN_DATA 887 #endif 888 889 #ifdef CONFIG_PM_TRACE 890 #define TRACEDATA \ 891 . = ALIGN(4); \ 892 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 893 __tracedata_start = .; \ 894 KEEP(*(.tracedata)) \ 895 __tracedata_end = .; \ 896 } 897 #else 898 #define TRACEDATA 899 #endif 900 901 #ifdef CONFIG_PRINTK_INDEX 902 #define PRINTK_INDEX \ 903 .printk_index : AT(ADDR(.printk_index) - LOAD_OFFSET) { \ 904 __start_printk_index = .; \ 905 *(.printk_index) \ 906 __stop_printk_index = .; \ 907 } 908 #else 909 #define PRINTK_INDEX 910 #endif 911 912 #define NOTES \ 913 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 914 __start_notes = .; \ 915 KEEP(*(.note.*)) \ 916 __stop_notes = .; \ 917 } NOTES_HEADERS \ 918 NOTES_HEADERS_RESTORE 919 920 #define INIT_SETUP(initsetup_align) \ 921 . = ALIGN(initsetup_align); \ 922 __setup_start = .; \ 923 KEEP(*(.init.setup)) \ 924 __setup_end = .; 925 926 #define INIT_CALLS_LEVEL(level) \ 927 __initcall##level##_start = .; \ 928 KEEP(*(.initcall##level##.init)) \ 929 KEEP(*(.initcall##level##s.init)) \ 930 931 #define INIT_CALLS \ 932 __initcall_start = .; \ 933 KEEP(*(.initcallearly.init)) \ 934 INIT_CALLS_LEVEL(0) \ 935 INIT_CALLS_LEVEL(1) \ 936 INIT_CALLS_LEVEL(2) \ 937 INIT_CALLS_LEVEL(3) \ 938 INIT_CALLS_LEVEL(4) \ 939 INIT_CALLS_LEVEL(5) \ 940 INIT_CALLS_LEVEL(rootfs) \ 941 INIT_CALLS_LEVEL(6) \ 942 INIT_CALLS_LEVEL(7) \ 943 __initcall_end = .; 944 945 #define CON_INITCALL \ 946 __con_initcall_start = .; \ 947 KEEP(*(.con_initcall.init)) \ 948 __con_initcall_end = .; 949 950 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */ 951 #define KUNIT_TABLE() \ 952 . = ALIGN(8); \ 953 __kunit_suites_start = .; \ 954 KEEP(*(.kunit_test_suites)) \ 955 __kunit_suites_end = .; 956 957 #ifdef CONFIG_BLK_DEV_INITRD 958 #define INIT_RAM_FS \ 959 . = ALIGN(4); \ 960 __initramfs_start = .; \ 961 KEEP(*(.init.ramfs)) \ 962 . = ALIGN(8); \ 963 KEEP(*(.init.ramfs.info)) 964 #else 965 #define INIT_RAM_FS 966 #endif 967 968 /* 969 * Memory encryption operates on a page basis. Since we need to clear 970 * the memory encryption mask for this section, it needs to be aligned 971 * on a page boundary and be a page-size multiple in length. 972 * 973 * Note: We use a separate section so that only this section gets 974 * decrypted to avoid exposing more than we wish. 975 */ 976 #ifdef CONFIG_AMD_MEM_ENCRYPT 977 #define PERCPU_DECRYPTED_SECTION \ 978 . = ALIGN(PAGE_SIZE); \ 979 *(.data..decrypted) \ 980 *(.data..percpu..decrypted) \ 981 . = ALIGN(PAGE_SIZE); 982 #else 983 #define PERCPU_DECRYPTED_SECTION 984 #endif 985 986 987 /* 988 * Default discarded sections. 989 * 990 * Some archs want to discard exit text/data at runtime rather than 991 * link time due to cross-section references such as alt instructions, 992 * bug table, eh_frame, etc. DISCARDS must be the last of output 993 * section definitions so that such archs put those in earlier section 994 * definitions. 995 */ 996 #ifdef RUNTIME_DISCARD_EXIT 997 #define EXIT_DISCARDS 998 #else 999 #define EXIT_DISCARDS \ 1000 EXIT_TEXT \ 1001 EXIT_DATA 1002 #endif 1003 1004 /* 1005 * Clang's -fprofile-arcs, -fsanitize=kernel-address, and 1006 * -fsanitize=thread produce unwanted sections (.eh_frame 1007 * and .init_array.*), but CONFIG_CONSTRUCTORS wants to 1008 * keep any .init_array.* sections. 1009 * https://bugs.llvm.org/show_bug.cgi?id=46478 1010 */ 1011 #if defined(CONFIG_GCOV_KERNEL) || defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN) || \ 1012 defined(CONFIG_CFI_CLANG) 1013 # ifdef CONFIG_CONSTRUCTORS 1014 # define SANITIZER_DISCARDS \ 1015 *(.eh_frame) 1016 # else 1017 # define SANITIZER_DISCARDS \ 1018 *(.init_array) *(.init_array.*) \ 1019 *(.eh_frame) 1020 # endif 1021 #else 1022 # define SANITIZER_DISCARDS 1023 #endif 1024 1025 #define COMMON_DISCARDS \ 1026 SANITIZER_DISCARDS \ 1027 *(.discard) \ 1028 *(.discard.*) \ 1029 *(.modinfo) \ 1030 /* ld.bfd warns about .gnu.version* even when not emitted */ \ 1031 *(.gnu.version*) \ 1032 1033 #define DISCARDS \ 1034 /DISCARD/ : { \ 1035 EXIT_DISCARDS \ 1036 EXIT_CALL \ 1037 COMMON_DISCARDS \ 1038 } 1039 1040 /** 1041 * PERCPU_INPUT - the percpu input sections 1042 * @cacheline: cacheline size 1043 * 1044 * The core percpu section names and core symbols which do not rely 1045 * directly upon load addresses. 1046 * 1047 * @cacheline is used to align subsections to avoid false cacheline 1048 * sharing between subsections for different purposes. 1049 */ 1050 #define PERCPU_INPUT(cacheline) \ 1051 __per_cpu_start = .; \ 1052 *(.data..percpu..first) \ 1053 . = ALIGN(PAGE_SIZE); \ 1054 *(.data..percpu..page_aligned) \ 1055 . = ALIGN(cacheline); \ 1056 *(.data..percpu..read_mostly) \ 1057 . = ALIGN(cacheline); \ 1058 *(.data..percpu) \ 1059 *(.data..percpu..shared_aligned) \ 1060 PERCPU_DECRYPTED_SECTION \ 1061 __per_cpu_end = .; 1062 1063 /** 1064 * PERCPU_VADDR - define output section for percpu area 1065 * @cacheline: cacheline size 1066 * @vaddr: explicit base address (optional) 1067 * @phdr: destination PHDR (optional) 1068 * 1069 * Macro which expands to output section for percpu area. 1070 * 1071 * @cacheline is used to align subsections to avoid false cacheline 1072 * sharing between subsections for different purposes. 1073 * 1074 * If @vaddr is not blank, it specifies explicit base address and all 1075 * percpu symbols will be offset from the given address. If blank, 1076 * @vaddr always equals @laddr + LOAD_OFFSET. 1077 * 1078 * @phdr defines the output PHDR to use if not blank. Be warned that 1079 * output PHDR is sticky. If @phdr is specified, the next output 1080 * section in the linker script will go there too. @phdr should have 1081 * a leading colon. 1082 * 1083 * Note that this macros defines __per_cpu_load as an absolute symbol. 1084 * If there is no need to put the percpu section at a predetermined 1085 * address, use PERCPU_SECTION. 1086 */ 1087 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 1088 __per_cpu_load = .; \ 1089 .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \ 1090 PERCPU_INPUT(cacheline) \ 1091 } phdr \ 1092 . = __per_cpu_load + SIZEOF(.data..percpu); 1093 1094 /** 1095 * PERCPU_SECTION - define output section for percpu area, simple version 1096 * @cacheline: cacheline size 1097 * 1098 * Align to PAGE_SIZE and outputs output section for percpu area. This 1099 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 1100 * __per_cpu_start will be identical. 1101 * 1102 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 1103 * except that __per_cpu_load is defined as a relative symbol against 1104 * .data..percpu which is required for relocatable x86_32 configuration. 1105 */ 1106 #define PERCPU_SECTION(cacheline) \ 1107 . = ALIGN(PAGE_SIZE); \ 1108 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 1109 __per_cpu_load = .; \ 1110 PERCPU_INPUT(cacheline) \ 1111 } 1112 1113 1114 /* 1115 * Definition of the high level *_SECTION macros 1116 * They will fit only a subset of the architectures 1117 */ 1118 1119 1120 /* 1121 * Writeable data. 1122 * All sections are combined in a single .data section. 1123 * The sections following CONSTRUCTORS are arranged so their 1124 * typical alignment matches. 1125 * A cacheline is typical/always less than a PAGE_SIZE so 1126 * the sections that has this restriction (or similar) 1127 * is located before the ones requiring PAGE_SIZE alignment. 1128 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 1129 * matches the requirement of PAGE_ALIGNED_DATA. 1130 * 1131 * use 0 as page_align if page_aligned data is not used */ 1132 #define RW_DATA(cacheline, pagealigned, inittask) \ 1133 . = ALIGN(PAGE_SIZE); \ 1134 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 1135 INIT_TASK_DATA(inittask) \ 1136 NOSAVE_DATA \ 1137 PAGE_ALIGNED_DATA(pagealigned) \ 1138 CACHELINE_ALIGNED_DATA(cacheline) \ 1139 READ_MOSTLY_DATA(cacheline) \ 1140 DATA_DATA \ 1141 CONSTRUCTORS \ 1142 } \ 1143 BUG_TABLE \ 1144 1145 #define INIT_TEXT_SECTION(inittext_align) \ 1146 . = ALIGN(inittext_align); \ 1147 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 1148 _sinittext = .; \ 1149 INIT_TEXT \ 1150 _einittext = .; \ 1151 } 1152 1153 #define INIT_DATA_SECTION(initsetup_align) \ 1154 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 1155 INIT_DATA \ 1156 INIT_SETUP(initsetup_align) \ 1157 INIT_CALLS \ 1158 CON_INITCALL \ 1159 INIT_RAM_FS \ 1160 } 1161 1162 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 1163 . = ALIGN(sbss_align); \ 1164 __bss_start = .; \ 1165 SBSS(sbss_align) \ 1166 BSS(bss_align) \ 1167 . = ALIGN(stop_align); \ 1168 __bss_stop = .; 1169