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 __begin_sched_classes = .; \ 130 *(__idle_sched_class) \ 131 *(__fair_sched_class) \ 132 *(__rt_sched_class) \ 133 *(__dl_sched_class) \ 134 *(__stop_sched_class) \ 135 __end_sched_classes = .; 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 #define MCOUNT_REC() . = ALIGN(8); \ 169 __start_mcount_loc = .; \ 170 KEEP(*(__mcount_loc)) \ 171 KEEP(*(__patchable_function_entries)) \ 172 __stop_mcount_loc = .; \ 173 ftrace_stub_graph = ftrace_stub; 174 #else 175 # ifdef CONFIG_FUNCTION_TRACER 176 # define MCOUNT_REC() ftrace_stub_graph = ftrace_stub; 177 # else 178 # define MCOUNT_REC() 179 # endif 180 #endif 181 182 #ifdef CONFIG_TRACE_BRANCH_PROFILING 183 #define LIKELY_PROFILE() __start_annotated_branch_profile = .; \ 184 KEEP(*(_ftrace_annotated_branch)) \ 185 __stop_annotated_branch_profile = .; 186 #else 187 #define LIKELY_PROFILE() 188 #endif 189 190 #ifdef CONFIG_PROFILE_ALL_BRANCHES 191 #define BRANCH_PROFILE() __start_branch_profile = .; \ 192 KEEP(*(_ftrace_branch)) \ 193 __stop_branch_profile = .; 194 #else 195 #define BRANCH_PROFILE() 196 #endif 197 198 #ifdef CONFIG_KPROBES 199 #define KPROBE_BLACKLIST() . = ALIGN(8); \ 200 __start_kprobe_blacklist = .; \ 201 KEEP(*(_kprobe_blacklist)) \ 202 __stop_kprobe_blacklist = .; 203 #else 204 #define KPROBE_BLACKLIST() 205 #endif 206 207 #ifdef CONFIG_FUNCTION_ERROR_INJECTION 208 #define ERROR_INJECT_WHITELIST() STRUCT_ALIGN(); \ 209 __start_error_injection_whitelist = .; \ 210 KEEP(*(_error_injection_whitelist)) \ 211 __stop_error_injection_whitelist = .; 212 #else 213 #define ERROR_INJECT_WHITELIST() 214 #endif 215 216 #ifdef CONFIG_EVENT_TRACING 217 #define FTRACE_EVENTS() . = ALIGN(8); \ 218 __start_ftrace_events = .; \ 219 KEEP(*(_ftrace_events)) \ 220 __stop_ftrace_events = .; \ 221 __start_ftrace_eval_maps = .; \ 222 KEEP(*(_ftrace_eval_map)) \ 223 __stop_ftrace_eval_maps = .; 224 #else 225 #define FTRACE_EVENTS() 226 #endif 227 228 #ifdef CONFIG_TRACING 229 #define TRACE_PRINTKS() __start___trace_bprintk_fmt = .; \ 230 KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \ 231 __stop___trace_bprintk_fmt = .; 232 #define TRACEPOINT_STR() __start___tracepoint_str = .; \ 233 KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \ 234 __stop___tracepoint_str = .; 235 #else 236 #define TRACE_PRINTKS() 237 #define TRACEPOINT_STR() 238 #endif 239 240 #ifdef CONFIG_FTRACE_SYSCALLS 241 #define TRACE_SYSCALLS() . = ALIGN(8); \ 242 __start_syscalls_metadata = .; \ 243 KEEP(*(__syscalls_metadata)) \ 244 __stop_syscalls_metadata = .; 245 #else 246 #define TRACE_SYSCALLS() 247 #endif 248 249 #ifdef CONFIG_BPF_EVENTS 250 #define BPF_RAW_TP() STRUCT_ALIGN(); \ 251 __start__bpf_raw_tp = .; \ 252 KEEP(*(__bpf_raw_tp_map)) \ 253 __stop__bpf_raw_tp = .; 254 #else 255 #define BPF_RAW_TP() 256 #endif 257 258 #ifdef CONFIG_SERIAL_EARLYCON 259 #define EARLYCON_TABLE() . = ALIGN(8); \ 260 __earlycon_table = .; \ 261 KEEP(*(__earlycon_table)) \ 262 __earlycon_table_end = .; 263 #else 264 #define EARLYCON_TABLE() 265 #endif 266 267 #ifdef CONFIG_SECURITY 268 #define LSM_TABLE() . = ALIGN(8); \ 269 __start_lsm_info = .; \ 270 KEEP(*(.lsm_info.init)) \ 271 __end_lsm_info = .; 272 #define EARLY_LSM_TABLE() . = ALIGN(8); \ 273 __start_early_lsm_info = .; \ 274 KEEP(*(.early_lsm_info.init)) \ 275 __end_early_lsm_info = .; 276 #else 277 #define LSM_TABLE() 278 #define EARLY_LSM_TABLE() 279 #endif 280 281 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name) 282 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name) 283 #define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name) 284 #define _OF_TABLE_0(name) 285 #define _OF_TABLE_1(name) \ 286 . = ALIGN(8); \ 287 __##name##_of_table = .; \ 288 KEEP(*(__##name##_of_table)) \ 289 KEEP(*(__##name##_of_table_end)) 290 291 #define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer) 292 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip) 293 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk) 294 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem) 295 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method) 296 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method) 297 298 #ifdef CONFIG_ACPI 299 #define ACPI_PROBE_TABLE(name) \ 300 . = ALIGN(8); \ 301 __##name##_acpi_probe_table = .; \ 302 KEEP(*(__##name##_acpi_probe_table)) \ 303 __##name##_acpi_probe_table_end = .; 304 #else 305 #define ACPI_PROBE_TABLE(name) 306 #endif 307 308 #ifdef CONFIG_THERMAL 309 #define THERMAL_TABLE(name) \ 310 . = ALIGN(8); \ 311 __##name##_thermal_table = .; \ 312 KEEP(*(__##name##_thermal_table)) \ 313 __##name##_thermal_table_end = .; 314 #else 315 #define THERMAL_TABLE(name) 316 #endif 317 318 #ifdef CONFIG_DTPM 319 #define DTPM_TABLE() \ 320 . = ALIGN(8); \ 321 __dtpm_table = .; \ 322 KEEP(*(__dtpm_table)) \ 323 __dtpm_table_end = .; 324 #else 325 #define DTPM_TABLE() 326 #endif 327 328 #define KERNEL_DTB() \ 329 STRUCT_ALIGN(); \ 330 __dtb_start = .; \ 331 KEEP(*(.dtb.init.rodata)) \ 332 __dtb_end = .; 333 334 /* 335 * .data section 336 */ 337 #define DATA_DATA \ 338 *(.xiptext) \ 339 *(DATA_MAIN) \ 340 *(.data..decrypted) \ 341 *(.ref.data) \ 342 *(.data..shared_aligned) /* percpu related */ \ 343 MEM_KEEP(init.data*) \ 344 MEM_KEEP(exit.data*) \ 345 *(.data.unlikely) \ 346 __start_once = .; \ 347 *(.data.once) \ 348 __end_once = .; \ 349 STRUCT_ALIGN(); \ 350 *(__tracepoints) \ 351 /* implement dynamic printk debug */ \ 352 . = ALIGN(8); \ 353 __start___dyndbg = .; \ 354 KEEP(*(__dyndbg)) \ 355 __stop___dyndbg = .; \ 356 LIKELY_PROFILE() \ 357 BRANCH_PROFILE() \ 358 TRACE_PRINTKS() \ 359 BPF_RAW_TP() \ 360 TRACEPOINT_STR() 361 362 /* 363 * Data section helpers 364 */ 365 #define NOSAVE_DATA \ 366 . = ALIGN(PAGE_SIZE); \ 367 __nosave_begin = .; \ 368 *(.data..nosave) \ 369 . = ALIGN(PAGE_SIZE); \ 370 __nosave_end = .; 371 372 #define PAGE_ALIGNED_DATA(page_align) \ 373 . = ALIGN(page_align); \ 374 *(.data..page_aligned) \ 375 . = ALIGN(page_align); 376 377 #define READ_MOSTLY_DATA(align) \ 378 . = ALIGN(align); \ 379 *(.data..read_mostly) \ 380 . = ALIGN(align); 381 382 #define CACHELINE_ALIGNED_DATA(align) \ 383 . = ALIGN(align); \ 384 *(.data..cacheline_aligned) 385 386 #define INIT_TASK_DATA(align) \ 387 . = ALIGN(align); \ 388 __start_init_task = .; \ 389 init_thread_union = .; \ 390 init_stack = .; \ 391 KEEP(*(.data..init_task)) \ 392 KEEP(*(.data..init_thread_info)) \ 393 . = __start_init_task + THREAD_SIZE; \ 394 __end_init_task = .; 395 396 #define JUMP_TABLE_DATA \ 397 . = ALIGN(8); \ 398 __start___jump_table = .; \ 399 KEEP(*(__jump_table)) \ 400 __stop___jump_table = .; 401 402 #define STATIC_CALL_DATA \ 403 . = ALIGN(8); \ 404 __start_static_call_sites = .; \ 405 KEEP(*(.static_call_sites)) \ 406 __stop_static_call_sites = .; \ 407 __start_static_call_tramp_key = .; \ 408 KEEP(*(.static_call_tramp_key)) \ 409 __stop_static_call_tramp_key = .; 410 411 /* 412 * Allow architectures to handle ro_after_init data on their 413 * own by defining an empty RO_AFTER_INIT_DATA. 414 */ 415 #ifndef RO_AFTER_INIT_DATA 416 #define RO_AFTER_INIT_DATA \ 417 . = ALIGN(8); \ 418 __start_ro_after_init = .; \ 419 *(.data..ro_after_init) \ 420 JUMP_TABLE_DATA \ 421 STATIC_CALL_DATA \ 422 __end_ro_after_init = .; 423 #endif 424 425 /* 426 * Read only Data 427 */ 428 #define RO_DATA(align) \ 429 . = ALIGN((align)); \ 430 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 431 __start_rodata = .; \ 432 *(.rodata) *(.rodata.*) \ 433 SCHED_DATA \ 434 RO_AFTER_INIT_DATA /* Read only after init */ \ 435 . = ALIGN(8); \ 436 __start___tracepoints_ptrs = .; \ 437 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \ 438 __stop___tracepoints_ptrs = .; \ 439 *(__tracepoints_strings)/* Tracepoints: strings */ \ 440 } \ 441 \ 442 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 443 *(.rodata1) \ 444 } \ 445 \ 446 /* PCI quirks */ \ 447 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 448 __start_pci_fixups_early = .; \ 449 KEEP(*(.pci_fixup_early)) \ 450 __end_pci_fixups_early = .; \ 451 __start_pci_fixups_header = .; \ 452 KEEP(*(.pci_fixup_header)) \ 453 __end_pci_fixups_header = .; \ 454 __start_pci_fixups_final = .; \ 455 KEEP(*(.pci_fixup_final)) \ 456 __end_pci_fixups_final = .; \ 457 __start_pci_fixups_enable = .; \ 458 KEEP(*(.pci_fixup_enable)) \ 459 __end_pci_fixups_enable = .; \ 460 __start_pci_fixups_resume = .; \ 461 KEEP(*(.pci_fixup_resume)) \ 462 __end_pci_fixups_resume = .; \ 463 __start_pci_fixups_resume_early = .; \ 464 KEEP(*(.pci_fixup_resume_early)) \ 465 __end_pci_fixups_resume_early = .; \ 466 __start_pci_fixups_suspend = .; \ 467 KEEP(*(.pci_fixup_suspend)) \ 468 __end_pci_fixups_suspend = .; \ 469 __start_pci_fixups_suspend_late = .; \ 470 KEEP(*(.pci_fixup_suspend_late)) \ 471 __end_pci_fixups_suspend_late = .; \ 472 } \ 473 \ 474 /* Built-in firmware blobs */ \ 475 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) { \ 476 __start_builtin_fw = .; \ 477 KEEP(*(.builtin_fw)) \ 478 __end_builtin_fw = .; \ 479 } \ 480 \ 481 TRACEDATA \ 482 \ 483 PRINTK_INDEX \ 484 \ 485 /* Kernel symbol table: Normal symbols */ \ 486 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 487 __start___ksymtab = .; \ 488 KEEP(*(SORT(___ksymtab+*))) \ 489 __stop___ksymtab = .; \ 490 } \ 491 \ 492 /* Kernel symbol table: GPL-only symbols */ \ 493 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 494 __start___ksymtab_gpl = .; \ 495 KEEP(*(SORT(___ksymtab_gpl+*))) \ 496 __stop___ksymtab_gpl = .; \ 497 } \ 498 \ 499 /* Kernel symbol table: Normal symbols */ \ 500 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 501 __start___kcrctab = .; \ 502 KEEP(*(SORT(___kcrctab+*))) \ 503 __stop___kcrctab = .; \ 504 } \ 505 \ 506 /* Kernel symbol table: GPL-only symbols */ \ 507 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 508 __start___kcrctab_gpl = .; \ 509 KEEP(*(SORT(___kcrctab_gpl+*))) \ 510 __stop___kcrctab_gpl = .; \ 511 } \ 512 \ 513 /* Kernel symbol table: strings */ \ 514 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 515 *(__ksymtab_strings) \ 516 } \ 517 \ 518 /* __*init sections */ \ 519 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 520 *(.ref.rodata) \ 521 MEM_KEEP(init.rodata) \ 522 MEM_KEEP(exit.rodata) \ 523 } \ 524 \ 525 /* Built-in module parameters. */ \ 526 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 527 __start___param = .; \ 528 KEEP(*(__param)) \ 529 __stop___param = .; \ 530 } \ 531 \ 532 /* Built-in module versions. */ \ 533 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 534 __start___modver = .; \ 535 KEEP(*(__modver)) \ 536 __stop___modver = .; \ 537 } \ 538 \ 539 RO_EXCEPTION_TABLE \ 540 NOTES \ 541 BTF \ 542 \ 543 . = ALIGN((align)); \ 544 __end_rodata = .; 545 546 547 /* 548 * .text..L.cfi.jumptable.* contain Control-Flow Integrity (CFI) 549 * jump table entries. 550 */ 551 #ifdef CONFIG_CFI_CLANG 552 #define TEXT_CFI_JT \ 553 ALIGN_FUNCTION(); \ 554 __cfi_jt_start = .; \ 555 *(.text..L.cfi.jumptable .text..L.cfi.jumptable.*) \ 556 __cfi_jt_end = .; 557 #else 558 #define TEXT_CFI_JT 559 #endif 560 561 /* 562 * Non-instrumentable text section 563 */ 564 #define NOINSTR_TEXT \ 565 ALIGN_FUNCTION(); \ 566 __noinstr_text_start = .; \ 567 *(.noinstr.text) \ 568 __noinstr_text_end = .; 569 570 /* 571 * .text section. Map to function alignment to avoid address changes 572 * during second ld run in second ld pass when generating System.map 573 * 574 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead 575 * code elimination is enabled, so these sections should be converted 576 * to use ".." first. 577 */ 578 #define TEXT_TEXT \ 579 ALIGN_FUNCTION(); \ 580 *(.text.hot .text.hot.*) \ 581 *(TEXT_MAIN .text.fixup) \ 582 *(.text.unlikely .text.unlikely.*) \ 583 *(.text.unknown .text.unknown.*) \ 584 NOINSTR_TEXT \ 585 *(.text..refcount) \ 586 *(.ref.text) \ 587 *(.text.asan.* .text.tsan.*) \ 588 TEXT_CFI_JT \ 589 MEM_KEEP(init.text*) \ 590 MEM_KEEP(exit.text*) \ 591 592 593 /* sched.text is aling to function alignment to secure we have same 594 * address even at second ld pass when generating System.map */ 595 #define SCHED_TEXT \ 596 ALIGN_FUNCTION(); \ 597 __sched_text_start = .; \ 598 *(.sched.text) \ 599 __sched_text_end = .; 600 601 /* spinlock.text is aling to function alignment to secure we have same 602 * address even at second ld pass when generating System.map */ 603 #define LOCK_TEXT \ 604 ALIGN_FUNCTION(); \ 605 __lock_text_start = .; \ 606 *(.spinlock.text) \ 607 __lock_text_end = .; 608 609 #define CPUIDLE_TEXT \ 610 ALIGN_FUNCTION(); \ 611 __cpuidle_text_start = .; \ 612 *(.cpuidle.text) \ 613 __cpuidle_text_end = .; 614 615 #define KPROBES_TEXT \ 616 ALIGN_FUNCTION(); \ 617 __kprobes_text_start = .; \ 618 *(.kprobes.text) \ 619 __kprobes_text_end = .; 620 621 #define ENTRY_TEXT \ 622 ALIGN_FUNCTION(); \ 623 __entry_text_start = .; \ 624 *(.entry.text) \ 625 __entry_text_end = .; 626 627 #define IRQENTRY_TEXT \ 628 ALIGN_FUNCTION(); \ 629 __irqentry_text_start = .; \ 630 *(.irqentry.text) \ 631 __irqentry_text_end = .; 632 633 #define SOFTIRQENTRY_TEXT \ 634 ALIGN_FUNCTION(); \ 635 __softirqentry_text_start = .; \ 636 *(.softirqentry.text) \ 637 __softirqentry_text_end = .; 638 639 #define STATIC_CALL_TEXT \ 640 ALIGN_FUNCTION(); \ 641 __static_call_text_start = .; \ 642 *(.static_call.text) \ 643 __static_call_text_end = .; 644 645 /* Section used for early init (in .S files) */ 646 #define HEAD_TEXT KEEP(*(.head.text)) 647 648 #define HEAD_TEXT_SECTION \ 649 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 650 HEAD_TEXT \ 651 } 652 653 /* 654 * Exception table 655 */ 656 #define EXCEPTION_TABLE(align) \ 657 . = ALIGN(align); \ 658 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 659 __start___ex_table = .; \ 660 KEEP(*(__ex_table)) \ 661 __stop___ex_table = .; \ 662 } 663 664 /* 665 * .BTF 666 */ 667 #ifdef CONFIG_DEBUG_INFO_BTF 668 #define BTF \ 669 .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \ 670 __start_BTF = .; \ 671 KEEP(*(.BTF)) \ 672 __stop_BTF = .; \ 673 } \ 674 . = ALIGN(4); \ 675 .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) { \ 676 *(.BTF_ids) \ 677 } 678 #else 679 #define BTF 680 #endif 681 682 /* 683 * Init task 684 */ 685 #define INIT_TASK_DATA_SECTION(align) \ 686 . = ALIGN(align); \ 687 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 688 INIT_TASK_DATA(align) \ 689 } 690 691 #ifdef CONFIG_CONSTRUCTORS 692 #define KERNEL_CTORS() . = ALIGN(8); \ 693 __ctors_start = .; \ 694 KEEP(*(SORT(.ctors.*))) \ 695 KEEP(*(.ctors)) \ 696 KEEP(*(SORT(.init_array.*))) \ 697 KEEP(*(.init_array)) \ 698 __ctors_end = .; 699 #else 700 #define KERNEL_CTORS() 701 #endif 702 703 /* init and exit section handling */ 704 #define INIT_DATA \ 705 KEEP(*(SORT(___kentry+*))) \ 706 *(.init.data init.data.*) \ 707 MEM_DISCARD(init.data*) \ 708 KERNEL_CTORS() \ 709 MCOUNT_REC() \ 710 *(.init.rodata .init.rodata.*) \ 711 FTRACE_EVENTS() \ 712 TRACE_SYSCALLS() \ 713 KPROBE_BLACKLIST() \ 714 ERROR_INJECT_WHITELIST() \ 715 MEM_DISCARD(init.rodata) \ 716 CLK_OF_TABLES() \ 717 RESERVEDMEM_OF_TABLES() \ 718 TIMER_OF_TABLES() \ 719 CPU_METHOD_OF_TABLES() \ 720 CPUIDLE_METHOD_OF_TABLES() \ 721 KERNEL_DTB() \ 722 IRQCHIP_OF_MATCH_TABLE() \ 723 ACPI_PROBE_TABLE(irqchip) \ 724 ACPI_PROBE_TABLE(timer) \ 725 THERMAL_TABLE(governor) \ 726 DTPM_TABLE() \ 727 EARLYCON_TABLE() \ 728 LSM_TABLE() \ 729 EARLY_LSM_TABLE() \ 730 KUNIT_TABLE() 731 732 #define INIT_TEXT \ 733 *(.init.text .init.text.*) \ 734 *(.text.startup) \ 735 MEM_DISCARD(init.text*) 736 737 #define EXIT_DATA \ 738 *(.exit.data .exit.data.*) \ 739 *(.fini_array .fini_array.*) \ 740 *(.dtors .dtors.*) \ 741 MEM_DISCARD(exit.data*) \ 742 MEM_DISCARD(exit.rodata*) 743 744 #define EXIT_TEXT \ 745 *(.exit.text) \ 746 *(.text.exit) \ 747 MEM_DISCARD(exit.text) 748 749 #define EXIT_CALL \ 750 *(.exitcall.exit) 751 752 /* 753 * bss (Block Started by Symbol) - uninitialized data 754 * zeroed during startup 755 */ 756 #define SBSS(sbss_align) \ 757 . = ALIGN(sbss_align); \ 758 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 759 *(.dynsbss) \ 760 *(SBSS_MAIN) \ 761 *(.scommon) \ 762 } 763 764 /* 765 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 766 * sections to the front of bss. 767 */ 768 #ifndef BSS_FIRST_SECTIONS 769 #define BSS_FIRST_SECTIONS 770 #endif 771 772 #define BSS(bss_align) \ 773 . = ALIGN(bss_align); \ 774 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 775 BSS_FIRST_SECTIONS \ 776 . = ALIGN(PAGE_SIZE); \ 777 *(.bss..page_aligned) \ 778 . = ALIGN(PAGE_SIZE); \ 779 *(.dynbss) \ 780 *(BSS_MAIN) \ 781 *(COMMON) \ 782 } 783 784 /* 785 * DWARF debug sections. 786 * Symbols in the DWARF debugging sections are relative to 787 * the beginning of the section so we begin them at 0. 788 */ 789 #define DWARF_DEBUG \ 790 /* DWARF 1 */ \ 791 .debug 0 : { *(.debug) } \ 792 .line 0 : { *(.line) } \ 793 /* GNU DWARF 1 extensions */ \ 794 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 795 .debug_sfnames 0 : { *(.debug_sfnames) } \ 796 /* DWARF 1.1 and DWARF 2 */ \ 797 .debug_aranges 0 : { *(.debug_aranges) } \ 798 .debug_pubnames 0 : { *(.debug_pubnames) } \ 799 /* DWARF 2 */ \ 800 .debug_info 0 : { *(.debug_info \ 801 .gnu.linkonce.wi.*) } \ 802 .debug_abbrev 0 : { *(.debug_abbrev) } \ 803 .debug_line 0 : { *(.debug_line) } \ 804 .debug_frame 0 : { *(.debug_frame) } \ 805 .debug_str 0 : { *(.debug_str) } \ 806 .debug_loc 0 : { *(.debug_loc) } \ 807 .debug_macinfo 0 : { *(.debug_macinfo) } \ 808 .debug_pubtypes 0 : { *(.debug_pubtypes) } \ 809 /* DWARF 3 */ \ 810 .debug_ranges 0 : { *(.debug_ranges) } \ 811 /* SGI/MIPS DWARF 2 extensions */ \ 812 .debug_weaknames 0 : { *(.debug_weaknames) } \ 813 .debug_funcnames 0 : { *(.debug_funcnames) } \ 814 .debug_typenames 0 : { *(.debug_typenames) } \ 815 .debug_varnames 0 : { *(.debug_varnames) } \ 816 /* GNU DWARF 2 extensions */ \ 817 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \ 818 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \ 819 /* DWARF 4 */ \ 820 .debug_types 0 : { *(.debug_types) } \ 821 /* DWARF 5 */ \ 822 .debug_addr 0 : { *(.debug_addr) } \ 823 .debug_line_str 0 : { *(.debug_line_str) } \ 824 .debug_loclists 0 : { *(.debug_loclists) } \ 825 .debug_macro 0 : { *(.debug_macro) } \ 826 .debug_names 0 : { *(.debug_names) } \ 827 .debug_rnglists 0 : { *(.debug_rnglists) } \ 828 .debug_str_offsets 0 : { *(.debug_str_offsets) } 829 830 /* Stabs debugging sections. */ 831 #define STABS_DEBUG \ 832 .stab 0 : { *(.stab) } \ 833 .stabstr 0 : { *(.stabstr) } \ 834 .stab.excl 0 : { *(.stab.excl) } \ 835 .stab.exclstr 0 : { *(.stab.exclstr) } \ 836 .stab.index 0 : { *(.stab.index) } \ 837 .stab.indexstr 0 : { *(.stab.indexstr) } 838 839 /* Required sections not related to debugging. */ 840 #define ELF_DETAILS \ 841 .comment 0 : { *(.comment) } \ 842 .symtab 0 : { *(.symtab) } \ 843 .strtab 0 : { *(.strtab) } \ 844 .shstrtab 0 : { *(.shstrtab) } 845 846 #ifdef CONFIG_GENERIC_BUG 847 #define BUG_TABLE \ 848 . = ALIGN(8); \ 849 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 850 __start___bug_table = .; \ 851 KEEP(*(__bug_table)) \ 852 __stop___bug_table = .; \ 853 } 854 #else 855 #define BUG_TABLE 856 #endif 857 858 #ifdef CONFIG_UNWINDER_ORC 859 #define ORC_UNWIND_TABLE \ 860 . = ALIGN(4); \ 861 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \ 862 __start_orc_unwind_ip = .; \ 863 KEEP(*(.orc_unwind_ip)) \ 864 __stop_orc_unwind_ip = .; \ 865 } \ 866 . = ALIGN(2); \ 867 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \ 868 __start_orc_unwind = .; \ 869 KEEP(*(.orc_unwind)) \ 870 __stop_orc_unwind = .; \ 871 } \ 872 . = ALIGN(4); \ 873 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \ 874 orc_lookup = .; \ 875 . += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) / \ 876 LOOKUP_BLOCK_SIZE) + 1) * 4; \ 877 orc_lookup_end = .; \ 878 } 879 #else 880 #define ORC_UNWIND_TABLE 881 #endif 882 883 #ifdef CONFIG_PM_TRACE 884 #define TRACEDATA \ 885 . = ALIGN(4); \ 886 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 887 __tracedata_start = .; \ 888 KEEP(*(.tracedata)) \ 889 __tracedata_end = .; \ 890 } 891 #else 892 #define TRACEDATA 893 #endif 894 895 #ifdef CONFIG_PRINTK_INDEX 896 #define PRINTK_INDEX \ 897 .printk_index : AT(ADDR(.printk_index) - LOAD_OFFSET) { \ 898 __start_printk_index = .; \ 899 *(.printk_index) \ 900 __stop_printk_index = .; \ 901 } 902 #else 903 #define PRINTK_INDEX 904 #endif 905 906 /* 907 * Discard .note.GNU-stack, which is emitted as PROGBITS by the compiler. 908 * Otherwise, the type of .notes section would become PROGBITS instead of NOTES. 909 */ 910 #define NOTES \ 911 /DISCARD/ : { *(.note.GNU-stack) } \ 912 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 913 __start_notes = .; \ 914 KEEP(*(.note.*)) \ 915 __stop_notes = .; \ 916 } NOTES_HEADERS \ 917 NOTES_HEADERS_RESTORE 918 919 #define INIT_SETUP(initsetup_align) \ 920 . = ALIGN(initsetup_align); \ 921 __setup_start = .; \ 922 KEEP(*(.init.setup)) \ 923 __setup_end = .; 924 925 #define INIT_CALLS_LEVEL(level) \ 926 __initcall##level##_start = .; \ 927 KEEP(*(.initcall##level##.init)) \ 928 KEEP(*(.initcall##level##s.init)) \ 929 930 #define INIT_CALLS \ 931 __initcall_start = .; \ 932 KEEP(*(.initcallearly.init)) \ 933 INIT_CALLS_LEVEL(0) \ 934 INIT_CALLS_LEVEL(1) \ 935 INIT_CALLS_LEVEL(2) \ 936 INIT_CALLS_LEVEL(3) \ 937 INIT_CALLS_LEVEL(4) \ 938 INIT_CALLS_LEVEL(5) \ 939 INIT_CALLS_LEVEL(rootfs) \ 940 INIT_CALLS_LEVEL(6) \ 941 INIT_CALLS_LEVEL(7) \ 942 __initcall_end = .; 943 944 #define CON_INITCALL \ 945 __con_initcall_start = .; \ 946 KEEP(*(.con_initcall.init)) \ 947 __con_initcall_end = .; 948 949 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */ 950 #define KUNIT_TABLE() \ 951 . = ALIGN(8); \ 952 __kunit_suites_start = .; \ 953 KEEP(*(.kunit_test_suites)) \ 954 __kunit_suites_end = .; 955 956 #ifdef CONFIG_BLK_DEV_INITRD 957 #define INIT_RAM_FS \ 958 . = ALIGN(4); \ 959 __initramfs_start = .; \ 960 KEEP(*(.init.ramfs)) \ 961 . = ALIGN(8); \ 962 KEEP(*(.init.ramfs.info)) 963 #else 964 #define INIT_RAM_FS 965 #endif 966 967 /* 968 * Memory encryption operates on a page basis. Since we need to clear 969 * the memory encryption mask for this section, it needs to be aligned 970 * on a page boundary and be a page-size multiple in length. 971 * 972 * Note: We use a separate section so that only this section gets 973 * decrypted to avoid exposing more than we wish. 974 */ 975 #ifdef CONFIG_AMD_MEM_ENCRYPT 976 #define PERCPU_DECRYPTED_SECTION \ 977 . = ALIGN(PAGE_SIZE); \ 978 *(.data..percpu..decrypted) \ 979 . = ALIGN(PAGE_SIZE); 980 #else 981 #define PERCPU_DECRYPTED_SECTION 982 #endif 983 984 985 /* 986 * Default discarded sections. 987 * 988 * Some archs want to discard exit text/data at runtime rather than 989 * link time due to cross-section references such as alt instructions, 990 * bug table, eh_frame, etc. DISCARDS must be the last of output 991 * section definitions so that such archs put those in earlier section 992 * definitions. 993 */ 994 #ifdef RUNTIME_DISCARD_EXIT 995 #define EXIT_DISCARDS 996 #else 997 #define EXIT_DISCARDS \ 998 EXIT_TEXT \ 999 EXIT_DATA 1000 #endif 1001 1002 /* 1003 * Clang's -fprofile-arcs, -fsanitize=kernel-address, and 1004 * -fsanitize=thread produce unwanted sections (.eh_frame 1005 * and .init_array.*), but CONFIG_CONSTRUCTORS wants to 1006 * keep any .init_array.* sections. 1007 * https://bugs.llvm.org/show_bug.cgi?id=46478 1008 */ 1009 #ifdef CONFIG_UNWIND_TABLES 1010 #define DISCARD_EH_FRAME 1011 #else 1012 #define DISCARD_EH_FRAME *(.eh_frame) 1013 #endif 1014 #if defined(CONFIG_GCOV_KERNEL) || defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN) || \ 1015 defined(CONFIG_CFI_CLANG) 1016 # ifdef CONFIG_CONSTRUCTORS 1017 # define SANITIZER_DISCARDS \ 1018 DISCARD_EH_FRAME 1019 # else 1020 # define SANITIZER_DISCARDS \ 1021 *(.init_array) *(.init_array.*) \ 1022 DISCARD_EH_FRAME 1023 # endif 1024 #else 1025 # define SANITIZER_DISCARDS 1026 #endif 1027 1028 #define COMMON_DISCARDS \ 1029 SANITIZER_DISCARDS \ 1030 *(.discard) \ 1031 *(.discard.*) \ 1032 *(.modinfo) \ 1033 /* ld.bfd warns about .gnu.version* even when not emitted */ \ 1034 *(.gnu.version*) \ 1035 1036 #define DISCARDS \ 1037 /DISCARD/ : { \ 1038 EXIT_DISCARDS \ 1039 EXIT_CALL \ 1040 COMMON_DISCARDS \ 1041 } 1042 1043 /** 1044 * PERCPU_INPUT - the percpu input sections 1045 * @cacheline: cacheline size 1046 * 1047 * The core percpu section names and core symbols which do not rely 1048 * directly upon load addresses. 1049 * 1050 * @cacheline is used to align subsections to avoid false cacheline 1051 * sharing between subsections for different purposes. 1052 */ 1053 #define PERCPU_INPUT(cacheline) \ 1054 __per_cpu_start = .; \ 1055 *(.data..percpu..first) \ 1056 . = ALIGN(PAGE_SIZE); \ 1057 *(.data..percpu..page_aligned) \ 1058 . = ALIGN(cacheline); \ 1059 *(.data..percpu..read_mostly) \ 1060 . = ALIGN(cacheline); \ 1061 *(.data..percpu) \ 1062 *(.data..percpu..shared_aligned) \ 1063 PERCPU_DECRYPTED_SECTION \ 1064 __per_cpu_end = .; 1065 1066 /** 1067 * PERCPU_VADDR - define output section for percpu area 1068 * @cacheline: cacheline size 1069 * @vaddr: explicit base address (optional) 1070 * @phdr: destination PHDR (optional) 1071 * 1072 * Macro which expands to output section for percpu area. 1073 * 1074 * @cacheline is used to align subsections to avoid false cacheline 1075 * sharing between subsections for different purposes. 1076 * 1077 * If @vaddr is not blank, it specifies explicit base address and all 1078 * percpu symbols will be offset from the given address. If blank, 1079 * @vaddr always equals @laddr + LOAD_OFFSET. 1080 * 1081 * @phdr defines the output PHDR to use if not blank. Be warned that 1082 * output PHDR is sticky. If @phdr is specified, the next output 1083 * section in the linker script will go there too. @phdr should have 1084 * a leading colon. 1085 * 1086 * Note that this macros defines __per_cpu_load as an absolute symbol. 1087 * If there is no need to put the percpu section at a predetermined 1088 * address, use PERCPU_SECTION. 1089 */ 1090 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 1091 __per_cpu_load = .; \ 1092 .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \ 1093 PERCPU_INPUT(cacheline) \ 1094 } phdr \ 1095 . = __per_cpu_load + SIZEOF(.data..percpu); 1096 1097 /** 1098 * PERCPU_SECTION - define output section for percpu area, simple version 1099 * @cacheline: cacheline size 1100 * 1101 * Align to PAGE_SIZE and outputs output section for percpu area. This 1102 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 1103 * __per_cpu_start will be identical. 1104 * 1105 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 1106 * except that __per_cpu_load is defined as a relative symbol against 1107 * .data..percpu which is required for relocatable x86_32 configuration. 1108 */ 1109 #define PERCPU_SECTION(cacheline) \ 1110 . = ALIGN(PAGE_SIZE); \ 1111 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 1112 __per_cpu_load = .; \ 1113 PERCPU_INPUT(cacheline) \ 1114 } 1115 1116 1117 /* 1118 * Definition of the high level *_SECTION macros 1119 * They will fit only a subset of the architectures 1120 */ 1121 1122 1123 /* 1124 * Writeable data. 1125 * All sections are combined in a single .data section. 1126 * The sections following CONSTRUCTORS are arranged so their 1127 * typical alignment matches. 1128 * A cacheline is typical/always less than a PAGE_SIZE so 1129 * the sections that has this restriction (or similar) 1130 * is located before the ones requiring PAGE_SIZE alignment. 1131 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 1132 * matches the requirement of PAGE_ALIGNED_DATA. 1133 * 1134 * use 0 as page_align if page_aligned data is not used */ 1135 #define RW_DATA(cacheline, pagealigned, inittask) \ 1136 . = ALIGN(PAGE_SIZE); \ 1137 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 1138 INIT_TASK_DATA(inittask) \ 1139 NOSAVE_DATA \ 1140 PAGE_ALIGNED_DATA(pagealigned) \ 1141 CACHELINE_ALIGNED_DATA(cacheline) \ 1142 READ_MOSTLY_DATA(cacheline) \ 1143 DATA_DATA \ 1144 CONSTRUCTORS \ 1145 } \ 1146 BUG_TABLE \ 1147 1148 #define INIT_TEXT_SECTION(inittext_align) \ 1149 . = ALIGN(inittext_align); \ 1150 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 1151 _sinittext = .; \ 1152 INIT_TEXT \ 1153 _einittext = .; \ 1154 } 1155 1156 #define INIT_DATA_SECTION(initsetup_align) \ 1157 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 1158 INIT_DATA \ 1159 INIT_SETUP(initsetup_align) \ 1160 INIT_CALLS \ 1161 CON_INITCALL \ 1162 INIT_RAM_FS \ 1163 } 1164 1165 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 1166 . = ALIGN(sbss_align); \ 1167 __bss_start = .; \ 1168 SBSS(sbss_align) \ 1169 BSS(bss_align) \ 1170 . = ALIGN(stop_align); \ 1171 __bss_stop = .; 1172