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 * 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 #ifdef CONFIG_DTPM 325 #define DTPM_TABLE() \ 326 . = ALIGN(8); \ 327 __dtpm_table = .; \ 328 KEEP(*(__dtpm_table)) \ 329 __dtpm_table_end = .; 330 #else 331 #define DTPM_TABLE() 332 #endif 333 334 #define KERNEL_DTB() \ 335 STRUCT_ALIGN(); \ 336 __dtb_start = .; \ 337 KEEP(*(.dtb.init.rodata)) \ 338 __dtb_end = .; 339 340 /* 341 * .data section 342 */ 343 #define DATA_DATA \ 344 *(.xiptext) \ 345 *(DATA_MAIN) \ 346 *(.ref.data) \ 347 *(.data..shared_aligned) /* percpu related */ \ 348 MEM_KEEP(init.data*) \ 349 MEM_KEEP(exit.data*) \ 350 *(.data.unlikely) \ 351 __start_once = .; \ 352 *(.data.once) \ 353 __end_once = .; \ 354 STRUCT_ALIGN(); \ 355 *(__tracepoints) \ 356 /* implement dynamic printk debug */ \ 357 . = ALIGN(8); \ 358 __start___dyndbg = .; \ 359 KEEP(*(__dyndbg)) \ 360 __stop___dyndbg = .; \ 361 LIKELY_PROFILE() \ 362 BRANCH_PROFILE() \ 363 TRACE_PRINTKS() \ 364 BPF_RAW_TP() \ 365 TRACEPOINT_STR() 366 367 /* 368 * Data section helpers 369 */ 370 #define NOSAVE_DATA \ 371 . = ALIGN(PAGE_SIZE); \ 372 __nosave_begin = .; \ 373 *(.data..nosave) \ 374 . = ALIGN(PAGE_SIZE); \ 375 __nosave_end = .; 376 377 #define PAGE_ALIGNED_DATA(page_align) \ 378 . = ALIGN(page_align); \ 379 *(.data..page_aligned) \ 380 . = ALIGN(page_align); 381 382 #define READ_MOSTLY_DATA(align) \ 383 . = ALIGN(align); \ 384 *(.data..read_mostly) \ 385 . = ALIGN(align); 386 387 #define CACHELINE_ALIGNED_DATA(align) \ 388 . = ALIGN(align); \ 389 *(.data..cacheline_aligned) 390 391 #define INIT_TASK_DATA(align) \ 392 . = ALIGN(align); \ 393 __start_init_task = .; \ 394 init_thread_union = .; \ 395 init_stack = .; \ 396 KEEP(*(.data..init_task)) \ 397 KEEP(*(.data..init_thread_info)) \ 398 . = __start_init_task + THREAD_SIZE; \ 399 __end_init_task = .; 400 401 #define JUMP_TABLE_DATA \ 402 . = ALIGN(8); \ 403 __start___jump_table = .; \ 404 KEEP(*(__jump_table)) \ 405 __stop___jump_table = .; 406 407 #define STATIC_CALL_DATA \ 408 . = ALIGN(8); \ 409 __start_static_call_sites = .; \ 410 KEEP(*(.static_call_sites)) \ 411 __stop_static_call_sites = .; \ 412 __start_static_call_tramp_key = .; \ 413 KEEP(*(.static_call_tramp_key)) \ 414 __stop_static_call_tramp_key = .; 415 416 /* 417 * Allow architectures to handle ro_after_init data on their 418 * own by defining an empty RO_AFTER_INIT_DATA. 419 */ 420 #ifndef RO_AFTER_INIT_DATA 421 #define RO_AFTER_INIT_DATA \ 422 . = ALIGN(8); \ 423 __start_ro_after_init = .; \ 424 *(.data..ro_after_init) \ 425 JUMP_TABLE_DATA \ 426 STATIC_CALL_DATA \ 427 __end_ro_after_init = .; 428 #endif 429 430 /* 431 * Read only Data 432 */ 433 #define RO_DATA(align) \ 434 . = ALIGN((align)); \ 435 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 436 __start_rodata = .; \ 437 *(.rodata) *(.rodata.*) \ 438 SCHED_DATA \ 439 RO_AFTER_INIT_DATA /* Read only after init */ \ 440 . = ALIGN(8); \ 441 __start___tracepoints_ptrs = .; \ 442 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \ 443 __stop___tracepoints_ptrs = .; \ 444 *(__tracepoints_strings)/* Tracepoints: strings */ \ 445 } \ 446 \ 447 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 448 *(.rodata1) \ 449 } \ 450 \ 451 /* PCI quirks */ \ 452 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 453 __start_pci_fixups_early = .; \ 454 KEEP(*(.pci_fixup_early)) \ 455 __end_pci_fixups_early = .; \ 456 __start_pci_fixups_header = .; \ 457 KEEP(*(.pci_fixup_header)) \ 458 __end_pci_fixups_header = .; \ 459 __start_pci_fixups_final = .; \ 460 KEEP(*(.pci_fixup_final)) \ 461 __end_pci_fixups_final = .; \ 462 __start_pci_fixups_enable = .; \ 463 KEEP(*(.pci_fixup_enable)) \ 464 __end_pci_fixups_enable = .; \ 465 __start_pci_fixups_resume = .; \ 466 KEEP(*(.pci_fixup_resume)) \ 467 __end_pci_fixups_resume = .; \ 468 __start_pci_fixups_resume_early = .; \ 469 KEEP(*(.pci_fixup_resume_early)) \ 470 __end_pci_fixups_resume_early = .; \ 471 __start_pci_fixups_suspend = .; \ 472 KEEP(*(.pci_fixup_suspend)) \ 473 __end_pci_fixups_suspend = .; \ 474 __start_pci_fixups_suspend_late = .; \ 475 KEEP(*(.pci_fixup_suspend_late)) \ 476 __end_pci_fixups_suspend_late = .; \ 477 } \ 478 \ 479 /* Built-in firmware blobs */ \ 480 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) { \ 481 __start_builtin_fw = .; \ 482 KEEP(*(.builtin_fw)) \ 483 __end_builtin_fw = .; \ 484 } \ 485 \ 486 TRACEDATA \ 487 \ 488 PRINTK_INDEX \ 489 \ 490 /* Kernel symbol table: Normal symbols */ \ 491 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 492 __start___ksymtab = .; \ 493 KEEP(*(SORT(___ksymtab+*))) \ 494 __stop___ksymtab = .; \ 495 } \ 496 \ 497 /* Kernel symbol table: GPL-only symbols */ \ 498 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 499 __start___ksymtab_gpl = .; \ 500 KEEP(*(SORT(___ksymtab_gpl+*))) \ 501 __stop___ksymtab_gpl = .; \ 502 } \ 503 \ 504 /* Kernel symbol table: Normal symbols */ \ 505 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 506 __start___kcrctab = .; \ 507 KEEP(*(SORT(___kcrctab+*))) \ 508 __stop___kcrctab = .; \ 509 } \ 510 \ 511 /* Kernel symbol table: GPL-only symbols */ \ 512 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 513 __start___kcrctab_gpl = .; \ 514 KEEP(*(SORT(___kcrctab_gpl+*))) \ 515 __stop___kcrctab_gpl = .; \ 516 } \ 517 \ 518 /* Kernel symbol table: strings */ \ 519 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 520 *(__ksymtab_strings) \ 521 } \ 522 \ 523 /* __*init sections */ \ 524 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 525 *(.ref.rodata) \ 526 MEM_KEEP(init.rodata) \ 527 MEM_KEEP(exit.rodata) \ 528 } \ 529 \ 530 /* Built-in module parameters. */ \ 531 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 532 __start___param = .; \ 533 KEEP(*(__param)) \ 534 __stop___param = .; \ 535 } \ 536 \ 537 /* Built-in module versions. */ \ 538 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 539 __start___modver = .; \ 540 KEEP(*(__modver)) \ 541 __stop___modver = .; \ 542 } \ 543 \ 544 RO_EXCEPTION_TABLE \ 545 NOTES \ 546 BTF \ 547 \ 548 . = ALIGN((align)); \ 549 __end_rodata = .; 550 551 552 /* 553 * .text..L.cfi.jumptable.* contain Control-Flow Integrity (CFI) 554 * jump table entries. 555 */ 556 #ifdef CONFIG_CFI_CLANG 557 #define TEXT_CFI_JT \ 558 . = ALIGN(PMD_SIZE); \ 559 __cfi_jt_start = .; \ 560 *(.text..L.cfi.jumptable .text..L.cfi.jumptable.*) \ 561 . = ALIGN(PMD_SIZE); \ 562 __cfi_jt_end = .; 563 #else 564 #define TEXT_CFI_JT 565 #endif 566 567 /* 568 * Non-instrumentable text section 569 */ 570 #define NOINSTR_TEXT \ 571 ALIGN_FUNCTION(); \ 572 __noinstr_text_start = .; \ 573 *(.noinstr.text) \ 574 __noinstr_text_end = .; 575 576 /* 577 * .text section. Map to function alignment to avoid address changes 578 * during second ld run in second ld pass when generating System.map 579 * 580 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead 581 * code elimination is enabled, so these sections should be converted 582 * to use ".." first. 583 */ 584 #define TEXT_TEXT \ 585 ALIGN_FUNCTION(); \ 586 *(.text.hot .text.hot.*) \ 587 *(TEXT_MAIN .text.fixup) \ 588 *(.text.unlikely .text.unlikely.*) \ 589 *(.text.unknown .text.unknown.*) \ 590 NOINSTR_TEXT \ 591 *(.text..refcount) \ 592 *(.ref.text) \ 593 *(.text.asan.* .text.tsan.*) \ 594 TEXT_CFI_JT \ 595 MEM_KEEP(init.text*) \ 596 MEM_KEEP(exit.text*) \ 597 598 599 /* sched.text is aling to function alignment to secure we have same 600 * address even at second ld pass when generating System.map */ 601 #define SCHED_TEXT \ 602 ALIGN_FUNCTION(); \ 603 __sched_text_start = .; \ 604 *(.sched.text) \ 605 __sched_text_end = .; 606 607 /* spinlock.text is aling to function alignment to secure we have same 608 * address even at second ld pass when generating System.map */ 609 #define LOCK_TEXT \ 610 ALIGN_FUNCTION(); \ 611 __lock_text_start = .; \ 612 *(.spinlock.text) \ 613 __lock_text_end = .; 614 615 #define CPUIDLE_TEXT \ 616 ALIGN_FUNCTION(); \ 617 __cpuidle_text_start = .; \ 618 *(.cpuidle.text) \ 619 __cpuidle_text_end = .; 620 621 #define KPROBES_TEXT \ 622 ALIGN_FUNCTION(); \ 623 __kprobes_text_start = .; \ 624 *(.kprobes.text) \ 625 __kprobes_text_end = .; 626 627 #define ENTRY_TEXT \ 628 ALIGN_FUNCTION(); \ 629 __entry_text_start = .; \ 630 *(.entry.text) \ 631 __entry_text_end = .; 632 633 #define IRQENTRY_TEXT \ 634 ALIGN_FUNCTION(); \ 635 __irqentry_text_start = .; \ 636 *(.irqentry.text) \ 637 __irqentry_text_end = .; 638 639 #define SOFTIRQENTRY_TEXT \ 640 ALIGN_FUNCTION(); \ 641 __softirqentry_text_start = .; \ 642 *(.softirqentry.text) \ 643 __softirqentry_text_end = .; 644 645 #define STATIC_CALL_TEXT \ 646 ALIGN_FUNCTION(); \ 647 __static_call_text_start = .; \ 648 *(.static_call.text) \ 649 __static_call_text_end = .; 650 651 /* Section used for early init (in .S files) */ 652 #define HEAD_TEXT KEEP(*(.head.text)) 653 654 #define HEAD_TEXT_SECTION \ 655 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 656 HEAD_TEXT \ 657 } 658 659 /* 660 * Exception table 661 */ 662 #define EXCEPTION_TABLE(align) \ 663 . = ALIGN(align); \ 664 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 665 __start___ex_table = .; \ 666 KEEP(*(__ex_table)) \ 667 __stop___ex_table = .; \ 668 } 669 670 /* 671 * .BTF 672 */ 673 #ifdef CONFIG_DEBUG_INFO_BTF 674 #define BTF \ 675 .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \ 676 __start_BTF = .; \ 677 KEEP(*(.BTF)) \ 678 __stop_BTF = .; \ 679 } \ 680 . = ALIGN(4); \ 681 .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) { \ 682 *(.BTF_ids) \ 683 } 684 #else 685 #define BTF 686 #endif 687 688 /* 689 * Init task 690 */ 691 #define INIT_TASK_DATA_SECTION(align) \ 692 . = ALIGN(align); \ 693 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 694 INIT_TASK_DATA(align) \ 695 } 696 697 #ifdef CONFIG_CONSTRUCTORS 698 #define KERNEL_CTORS() . = ALIGN(8); \ 699 __ctors_start = .; \ 700 KEEP(*(SORT(.ctors.*))) \ 701 KEEP(*(.ctors)) \ 702 KEEP(*(SORT(.init_array.*))) \ 703 KEEP(*(.init_array)) \ 704 __ctors_end = .; 705 #else 706 #define KERNEL_CTORS() 707 #endif 708 709 /* init and exit section handling */ 710 #define INIT_DATA \ 711 KEEP(*(SORT(___kentry+*))) \ 712 *(.init.data init.data.*) \ 713 MEM_DISCARD(init.data*) \ 714 KERNEL_CTORS() \ 715 MCOUNT_REC() \ 716 *(.init.rodata .init.rodata.*) \ 717 FTRACE_EVENTS() \ 718 TRACE_SYSCALLS() \ 719 KPROBE_BLACKLIST() \ 720 ERROR_INJECT_WHITELIST() \ 721 MEM_DISCARD(init.rodata) \ 722 CLK_OF_TABLES() \ 723 RESERVEDMEM_OF_TABLES() \ 724 TIMER_OF_TABLES() \ 725 CPU_METHOD_OF_TABLES() \ 726 CPUIDLE_METHOD_OF_TABLES() \ 727 KERNEL_DTB() \ 728 IRQCHIP_OF_MATCH_TABLE() \ 729 ACPI_PROBE_TABLE(irqchip) \ 730 ACPI_PROBE_TABLE(timer) \ 731 THERMAL_TABLE(governor) \ 732 DTPM_TABLE() \ 733 EARLYCON_TABLE() \ 734 LSM_TABLE() \ 735 EARLY_LSM_TABLE() \ 736 KUNIT_TABLE() 737 738 #define INIT_TEXT \ 739 *(.init.text .init.text.*) \ 740 *(.text.startup) \ 741 MEM_DISCARD(init.text*) 742 743 #define EXIT_DATA \ 744 *(.exit.data .exit.data.*) \ 745 *(.fini_array .fini_array.*) \ 746 *(.dtors .dtors.*) \ 747 MEM_DISCARD(exit.data*) \ 748 MEM_DISCARD(exit.rodata*) 749 750 #define EXIT_TEXT \ 751 *(.exit.text) \ 752 *(.text.exit) \ 753 MEM_DISCARD(exit.text) 754 755 #define EXIT_CALL \ 756 *(.exitcall.exit) 757 758 /* 759 * bss (Block Started by Symbol) - uninitialized data 760 * zeroed during startup 761 */ 762 #define SBSS(sbss_align) \ 763 . = ALIGN(sbss_align); \ 764 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 765 *(.dynsbss) \ 766 *(SBSS_MAIN) \ 767 *(.scommon) \ 768 } 769 770 /* 771 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 772 * sections to the front of bss. 773 */ 774 #ifndef BSS_FIRST_SECTIONS 775 #define BSS_FIRST_SECTIONS 776 #endif 777 778 #define BSS(bss_align) \ 779 . = ALIGN(bss_align); \ 780 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 781 BSS_FIRST_SECTIONS \ 782 . = ALIGN(PAGE_SIZE); \ 783 *(.bss..page_aligned) \ 784 . = ALIGN(PAGE_SIZE); \ 785 *(.dynbss) \ 786 *(BSS_MAIN) \ 787 *(COMMON) \ 788 } 789 790 /* 791 * DWARF debug sections. 792 * Symbols in the DWARF debugging sections are relative to 793 * the beginning of the section so we begin them at 0. 794 */ 795 #define DWARF_DEBUG \ 796 /* DWARF 1 */ \ 797 .debug 0 : { *(.debug) } \ 798 .line 0 : { *(.line) } \ 799 /* GNU DWARF 1 extensions */ \ 800 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 801 .debug_sfnames 0 : { *(.debug_sfnames) } \ 802 /* DWARF 1.1 and DWARF 2 */ \ 803 .debug_aranges 0 : { *(.debug_aranges) } \ 804 .debug_pubnames 0 : { *(.debug_pubnames) } \ 805 /* DWARF 2 */ \ 806 .debug_info 0 : { *(.debug_info \ 807 .gnu.linkonce.wi.*) } \ 808 .debug_abbrev 0 : { *(.debug_abbrev) } \ 809 .debug_line 0 : { *(.debug_line) } \ 810 .debug_frame 0 : { *(.debug_frame) } \ 811 .debug_str 0 : { *(.debug_str) } \ 812 .debug_loc 0 : { *(.debug_loc) } \ 813 .debug_macinfo 0 : { *(.debug_macinfo) } \ 814 .debug_pubtypes 0 : { *(.debug_pubtypes) } \ 815 /* DWARF 3 */ \ 816 .debug_ranges 0 : { *(.debug_ranges) } \ 817 /* SGI/MIPS DWARF 2 extensions */ \ 818 .debug_weaknames 0 : { *(.debug_weaknames) } \ 819 .debug_funcnames 0 : { *(.debug_funcnames) } \ 820 .debug_typenames 0 : { *(.debug_typenames) } \ 821 .debug_varnames 0 : { *(.debug_varnames) } \ 822 /* GNU DWARF 2 extensions */ \ 823 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \ 824 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \ 825 /* DWARF 4 */ \ 826 .debug_types 0 : { *(.debug_types) } \ 827 /* DWARF 5 */ \ 828 .debug_addr 0 : { *(.debug_addr) } \ 829 .debug_line_str 0 : { *(.debug_line_str) } \ 830 .debug_loclists 0 : { *(.debug_loclists) } \ 831 .debug_macro 0 : { *(.debug_macro) } \ 832 .debug_names 0 : { *(.debug_names) } \ 833 .debug_rnglists 0 : { *(.debug_rnglists) } \ 834 .debug_str_offsets 0 : { *(.debug_str_offsets) } 835 836 /* Stabs debugging sections. */ 837 #define STABS_DEBUG \ 838 .stab 0 : { *(.stab) } \ 839 .stabstr 0 : { *(.stabstr) } \ 840 .stab.excl 0 : { *(.stab.excl) } \ 841 .stab.exclstr 0 : { *(.stab.exclstr) } \ 842 .stab.index 0 : { *(.stab.index) } \ 843 .stab.indexstr 0 : { *(.stab.indexstr) } 844 845 /* Required sections not related to debugging. */ 846 #define ELF_DETAILS \ 847 .comment 0 : { *(.comment) } \ 848 .symtab 0 : { *(.symtab) } \ 849 .strtab 0 : { *(.strtab) } \ 850 .shstrtab 0 : { *(.shstrtab) } 851 852 #ifdef CONFIG_GENERIC_BUG 853 #define BUG_TABLE \ 854 . = ALIGN(8); \ 855 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 856 __start___bug_table = .; \ 857 KEEP(*(__bug_table)) \ 858 __stop___bug_table = .; \ 859 } 860 #else 861 #define BUG_TABLE 862 #endif 863 864 #ifdef CONFIG_UNWINDER_ORC 865 #define ORC_UNWIND_TABLE \ 866 . = ALIGN(4); \ 867 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \ 868 __start_orc_unwind_ip = .; \ 869 KEEP(*(.orc_unwind_ip)) \ 870 __stop_orc_unwind_ip = .; \ 871 } \ 872 . = ALIGN(2); \ 873 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \ 874 __start_orc_unwind = .; \ 875 KEEP(*(.orc_unwind)) \ 876 __stop_orc_unwind = .; \ 877 } \ 878 text_size = _etext - _stext; \ 879 . = ALIGN(4); \ 880 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \ 881 orc_lookup = .; \ 882 . += (((text_size + LOOKUP_BLOCK_SIZE - 1) / \ 883 LOOKUP_BLOCK_SIZE) + 1) * 4; \ 884 orc_lookup_end = .; \ 885 } 886 #else 887 #define ORC_UNWIND_TABLE 888 #endif 889 890 #ifdef CONFIG_PM_TRACE 891 #define TRACEDATA \ 892 . = ALIGN(4); \ 893 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 894 __tracedata_start = .; \ 895 KEEP(*(.tracedata)) \ 896 __tracedata_end = .; \ 897 } 898 #else 899 #define TRACEDATA 900 #endif 901 902 #ifdef CONFIG_PRINTK_INDEX 903 #define PRINTK_INDEX \ 904 .printk_index : AT(ADDR(.printk_index) - LOAD_OFFSET) { \ 905 __start_printk_index = .; \ 906 *(.printk_index) \ 907 __stop_printk_index = .; \ 908 } 909 #else 910 #define PRINTK_INDEX 911 #endif 912 913 #define NOTES \ 914 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 915 __start_notes = .; \ 916 KEEP(*(.note.*)) \ 917 __stop_notes = .; \ 918 } NOTES_HEADERS \ 919 NOTES_HEADERS_RESTORE 920 921 #define INIT_SETUP(initsetup_align) \ 922 . = ALIGN(initsetup_align); \ 923 __setup_start = .; \ 924 KEEP(*(.init.setup)) \ 925 __setup_end = .; 926 927 #define INIT_CALLS_LEVEL(level) \ 928 __initcall##level##_start = .; \ 929 KEEP(*(.initcall##level##.init)) \ 930 KEEP(*(.initcall##level##s.init)) \ 931 932 #define INIT_CALLS \ 933 __initcall_start = .; \ 934 KEEP(*(.initcallearly.init)) \ 935 INIT_CALLS_LEVEL(0) \ 936 INIT_CALLS_LEVEL(1) \ 937 INIT_CALLS_LEVEL(2) \ 938 INIT_CALLS_LEVEL(3) \ 939 INIT_CALLS_LEVEL(4) \ 940 INIT_CALLS_LEVEL(5) \ 941 INIT_CALLS_LEVEL(rootfs) \ 942 INIT_CALLS_LEVEL(6) \ 943 INIT_CALLS_LEVEL(7) \ 944 __initcall_end = .; 945 946 #define CON_INITCALL \ 947 __con_initcall_start = .; \ 948 KEEP(*(.con_initcall.init)) \ 949 __con_initcall_end = .; 950 951 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */ 952 #define KUNIT_TABLE() \ 953 . = ALIGN(8); \ 954 __kunit_suites_start = .; \ 955 KEEP(*(.kunit_test_suites)) \ 956 __kunit_suites_end = .; 957 958 #ifdef CONFIG_BLK_DEV_INITRD 959 #define INIT_RAM_FS \ 960 . = ALIGN(4); \ 961 __initramfs_start = .; \ 962 KEEP(*(.init.ramfs)) \ 963 . = ALIGN(8); \ 964 KEEP(*(.init.ramfs.info)) 965 #else 966 #define INIT_RAM_FS 967 #endif 968 969 /* 970 * Memory encryption operates on a page basis. Since we need to clear 971 * the memory encryption mask for this section, it needs to be aligned 972 * on a page boundary and be a page-size multiple in length. 973 * 974 * Note: We use a separate section so that only this section gets 975 * decrypted to avoid exposing more than we wish. 976 */ 977 #ifdef CONFIG_AMD_MEM_ENCRYPT 978 #define PERCPU_DECRYPTED_SECTION \ 979 . = ALIGN(PAGE_SIZE); \ 980 *(.data..decrypted) \ 981 *(.data..percpu..decrypted) \ 982 . = ALIGN(PAGE_SIZE); 983 #else 984 #define PERCPU_DECRYPTED_SECTION 985 #endif 986 987 988 /* 989 * Default discarded sections. 990 * 991 * Some archs want to discard exit text/data at runtime rather than 992 * link time due to cross-section references such as alt instructions, 993 * bug table, eh_frame, etc. DISCARDS must be the last of output 994 * section definitions so that such archs put those in earlier section 995 * definitions. 996 */ 997 #ifdef RUNTIME_DISCARD_EXIT 998 #define EXIT_DISCARDS 999 #else 1000 #define EXIT_DISCARDS \ 1001 EXIT_TEXT \ 1002 EXIT_DATA 1003 #endif 1004 1005 /* 1006 * Clang's -fprofile-arcs, -fsanitize=kernel-address, and 1007 * -fsanitize=thread produce unwanted sections (.eh_frame 1008 * and .init_array.*), but CONFIG_CONSTRUCTORS wants to 1009 * keep any .init_array.* sections. 1010 * https://bugs.llvm.org/show_bug.cgi?id=46478 1011 */ 1012 #if defined(CONFIG_GCOV_KERNEL) || defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN) || \ 1013 defined(CONFIG_CFI_CLANG) 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