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 * 38 * DISCARDS // must be the last 39 * } 40 * 41 * [__init_begin, __init_end] is the init section that may be freed after init 42 * // __init_begin and __init_end should be page aligned, so that we can 43 * // free the whole .init memory 44 * [_stext, _etext] is the text section 45 * [_sdata, _edata] is the data section 46 * 47 * Some of the included output section have their own set of constants. 48 * Examples are: [__initramfs_start, __initramfs_end] for initramfs and 49 * [__nosave_begin, __nosave_end] for the nosave data 50 */ 51 52 #ifndef LOAD_OFFSET 53 #define LOAD_OFFSET 0 54 #endif 55 56 /* 57 * Only some architectures want to have the .notes segment visible in 58 * a separate PT_NOTE ELF Program Header. When this happens, it needs 59 * to be visible in both the kernel text's PT_LOAD and the PT_NOTE 60 * Program Headers. In this case, though, the PT_LOAD needs to be made 61 * the default again so that all the following sections don't also end 62 * up in the PT_NOTE Program Header. 63 */ 64 #ifdef EMITS_PT_NOTE 65 #define NOTES_HEADERS :text :note 66 #define NOTES_HEADERS_RESTORE __restore_ph : { *(.__restore_ph) } :text 67 #else 68 #define NOTES_HEADERS 69 #define NOTES_HEADERS_RESTORE 70 #endif 71 72 /* 73 * Some architectures have non-executable read-only exception tables. 74 * They can be added to the RO_DATA segment by specifying their desired 75 * alignment. 76 */ 77 #ifdef RO_EXCEPTION_TABLE_ALIGN 78 #define RO_EXCEPTION_TABLE EXCEPTION_TABLE(RO_EXCEPTION_TABLE_ALIGN) 79 #else 80 #define RO_EXCEPTION_TABLE 81 #endif 82 83 /* Align . to a 8 byte boundary equals to maximum function alignment. */ 84 #define ALIGN_FUNCTION() . = ALIGN(8) 85 86 /* 87 * LD_DEAD_CODE_DATA_ELIMINATION option enables -fdata-sections, which 88 * generates .data.identifier sections, which need to be pulled in with 89 * .data. We don't want to pull in .data..other sections, which Linux 90 * has defined. Same for text and bss. 91 * 92 * RODATA_MAIN is not used because existing code already defines .rodata.x 93 * sections to be brought in with rodata. 94 */ 95 #ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 96 #define TEXT_MAIN .text .text.[0-9a-zA-Z_]* 97 #define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..LPBX* 98 #define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]* 99 #define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]* 100 #define BSS_MAIN .bss .bss.[0-9a-zA-Z_]* 101 #define SBSS_MAIN .sbss .sbss.[0-9a-zA-Z_]* 102 #else 103 #define TEXT_MAIN .text 104 #define DATA_MAIN .data 105 #define SDATA_MAIN .sdata 106 #define RODATA_MAIN .rodata 107 #define BSS_MAIN .bss 108 #define SBSS_MAIN .sbss 109 #endif 110 111 /* 112 * GCC 4.5 and later have a 32 bytes section alignment for structures. 113 * Except GCC 4.9, that feels the need to align on 64 bytes. 114 */ 115 #if __GNUC__ == 4 && __GNUC_MINOR__ == 9 116 #define STRUCT_ALIGNMENT 64 117 #else 118 #define STRUCT_ALIGNMENT 32 119 #endif 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 #define KERNEL_DTB() \ 319 STRUCT_ALIGN(); \ 320 __dtb_start = .; \ 321 KEEP(*(.dtb.init.rodata)) \ 322 __dtb_end = .; 323 324 /* 325 * .data section 326 */ 327 #define DATA_DATA \ 328 *(.xiptext) \ 329 *(DATA_MAIN) \ 330 *(.ref.data) \ 331 *(.data..shared_aligned) /* percpu related */ \ 332 MEM_KEEP(init.data*) \ 333 MEM_KEEP(exit.data*) \ 334 *(.data.unlikely) \ 335 __start_once = .; \ 336 *(.data.once) \ 337 __end_once = .; \ 338 STRUCT_ALIGN(); \ 339 *(__tracepoints) \ 340 /* implement dynamic printk debug */ \ 341 . = ALIGN(8); \ 342 __start___dyndbg = .; \ 343 KEEP(*(__dyndbg)) \ 344 __stop___dyndbg = .; \ 345 LIKELY_PROFILE() \ 346 BRANCH_PROFILE() \ 347 TRACE_PRINTKS() \ 348 BPF_RAW_TP() \ 349 TRACEPOINT_STR() 350 351 /* 352 * Data section helpers 353 */ 354 #define NOSAVE_DATA \ 355 . = ALIGN(PAGE_SIZE); \ 356 __nosave_begin = .; \ 357 *(.data..nosave) \ 358 . = ALIGN(PAGE_SIZE); \ 359 __nosave_end = .; 360 361 #define PAGE_ALIGNED_DATA(page_align) \ 362 . = ALIGN(page_align); \ 363 *(.data..page_aligned) \ 364 . = ALIGN(page_align); 365 366 #define READ_MOSTLY_DATA(align) \ 367 . = ALIGN(align); \ 368 *(.data..read_mostly) \ 369 . = ALIGN(align); 370 371 #define CACHELINE_ALIGNED_DATA(align) \ 372 . = ALIGN(align); \ 373 *(.data..cacheline_aligned) 374 375 #define INIT_TASK_DATA(align) \ 376 . = ALIGN(align); \ 377 __start_init_task = .; \ 378 init_thread_union = .; \ 379 init_stack = .; \ 380 KEEP(*(.data..init_task)) \ 381 KEEP(*(.data..init_thread_info)) \ 382 . = __start_init_task + THREAD_SIZE; \ 383 __end_init_task = .; 384 385 #define JUMP_TABLE_DATA \ 386 . = ALIGN(8); \ 387 __start___jump_table = .; \ 388 KEEP(*(__jump_table)) \ 389 __stop___jump_table = .; 390 391 #define STATIC_CALL_DATA \ 392 . = ALIGN(8); \ 393 __start_static_call_sites = .; \ 394 KEEP(*(.static_call_sites)) \ 395 __stop_static_call_sites = .; 396 397 /* 398 * Allow architectures to handle ro_after_init data on their 399 * own by defining an empty RO_AFTER_INIT_DATA. 400 */ 401 #ifndef RO_AFTER_INIT_DATA 402 #define RO_AFTER_INIT_DATA \ 403 . = ALIGN(8); \ 404 __start_ro_after_init = .; \ 405 *(.data..ro_after_init) \ 406 JUMP_TABLE_DATA \ 407 STATIC_CALL_DATA \ 408 __end_ro_after_init = .; 409 #endif 410 411 /* 412 * Read only Data 413 */ 414 #define RO_DATA(align) \ 415 . = ALIGN((align)); \ 416 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 417 __start_rodata = .; \ 418 *(.rodata) *(.rodata.*) \ 419 SCHED_DATA \ 420 RO_AFTER_INIT_DATA /* Read only after init */ \ 421 . = ALIGN(8); \ 422 __start___tracepoints_ptrs = .; \ 423 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \ 424 __stop___tracepoints_ptrs = .; \ 425 *(__tracepoints_strings)/* Tracepoints: strings */ \ 426 } \ 427 \ 428 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 429 *(.rodata1) \ 430 } \ 431 \ 432 /* PCI quirks */ \ 433 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 434 __start_pci_fixups_early = .; \ 435 KEEP(*(.pci_fixup_early)) \ 436 __end_pci_fixups_early = .; \ 437 __start_pci_fixups_header = .; \ 438 KEEP(*(.pci_fixup_header)) \ 439 __end_pci_fixups_header = .; \ 440 __start_pci_fixups_final = .; \ 441 KEEP(*(.pci_fixup_final)) \ 442 __end_pci_fixups_final = .; \ 443 __start_pci_fixups_enable = .; \ 444 KEEP(*(.pci_fixup_enable)) \ 445 __end_pci_fixups_enable = .; \ 446 __start_pci_fixups_resume = .; \ 447 KEEP(*(.pci_fixup_resume)) \ 448 __end_pci_fixups_resume = .; \ 449 __start_pci_fixups_resume_early = .; \ 450 KEEP(*(.pci_fixup_resume_early)) \ 451 __end_pci_fixups_resume_early = .; \ 452 __start_pci_fixups_suspend = .; \ 453 KEEP(*(.pci_fixup_suspend)) \ 454 __end_pci_fixups_suspend = .; \ 455 __start_pci_fixups_suspend_late = .; \ 456 KEEP(*(.pci_fixup_suspend_late)) \ 457 __end_pci_fixups_suspend_late = .; \ 458 } \ 459 \ 460 /* Built-in firmware blobs */ \ 461 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \ 462 __start_builtin_fw = .; \ 463 KEEP(*(.builtin_fw)) \ 464 __end_builtin_fw = .; \ 465 } \ 466 \ 467 TRACEDATA \ 468 \ 469 /* Kernel symbol table: Normal symbols */ \ 470 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 471 __start___ksymtab = .; \ 472 KEEP(*(SORT(___ksymtab+*))) \ 473 __stop___ksymtab = .; \ 474 } \ 475 \ 476 /* Kernel symbol table: GPL-only symbols */ \ 477 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 478 __start___ksymtab_gpl = .; \ 479 KEEP(*(SORT(___ksymtab_gpl+*))) \ 480 __stop___ksymtab_gpl = .; \ 481 } \ 482 \ 483 /* Kernel symbol table: Normal unused symbols */ \ 484 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \ 485 __start___ksymtab_unused = .; \ 486 KEEP(*(SORT(___ksymtab_unused+*))) \ 487 __stop___ksymtab_unused = .; \ 488 } \ 489 \ 490 /* Kernel symbol table: GPL-only unused symbols */ \ 491 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \ 492 __start___ksymtab_unused_gpl = .; \ 493 KEEP(*(SORT(___ksymtab_unused_gpl+*))) \ 494 __stop___ksymtab_unused_gpl = .; \ 495 } \ 496 \ 497 /* Kernel symbol table: GPL-future-only symbols */ \ 498 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \ 499 __start___ksymtab_gpl_future = .; \ 500 KEEP(*(SORT(___ksymtab_gpl_future+*))) \ 501 __stop___ksymtab_gpl_future = .; \ 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: Normal unused symbols */ \ 519 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \ 520 __start___kcrctab_unused = .; \ 521 KEEP(*(SORT(___kcrctab_unused+*))) \ 522 __stop___kcrctab_unused = .; \ 523 } \ 524 \ 525 /* Kernel symbol table: GPL-only unused symbols */ \ 526 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \ 527 __start___kcrctab_unused_gpl = .; \ 528 KEEP(*(SORT(___kcrctab_unused_gpl+*))) \ 529 __stop___kcrctab_unused_gpl = .; \ 530 } \ 531 \ 532 /* Kernel symbol table: GPL-future-only symbols */ \ 533 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \ 534 __start___kcrctab_gpl_future = .; \ 535 KEEP(*(SORT(___kcrctab_gpl_future+*))) \ 536 __stop___kcrctab_gpl_future = .; \ 537 } \ 538 \ 539 /* Kernel symbol table: strings */ \ 540 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 541 *(__ksymtab_strings) \ 542 } \ 543 \ 544 /* __*init sections */ \ 545 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 546 *(.ref.rodata) \ 547 MEM_KEEP(init.rodata) \ 548 MEM_KEEP(exit.rodata) \ 549 } \ 550 \ 551 /* Built-in module parameters. */ \ 552 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 553 __start___param = .; \ 554 KEEP(*(__param)) \ 555 __stop___param = .; \ 556 } \ 557 \ 558 /* Built-in module versions. */ \ 559 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 560 __start___modver = .; \ 561 KEEP(*(__modver)) \ 562 __stop___modver = .; \ 563 } \ 564 \ 565 RO_EXCEPTION_TABLE \ 566 NOTES \ 567 BTF \ 568 \ 569 . = ALIGN((align)); \ 570 __end_rodata = .; 571 572 /* 573 * Non-instrumentable text section 574 */ 575 #define NOINSTR_TEXT \ 576 ALIGN_FUNCTION(); \ 577 __noinstr_text_start = .; \ 578 *(.noinstr.text) \ 579 __noinstr_text_end = .; 580 581 /* 582 * .text section. Map to function alignment to avoid address changes 583 * during second ld run in second ld pass when generating System.map 584 * 585 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead 586 * code elimination is enabled, so these sections should be converted 587 * to use ".." first. 588 */ 589 #define TEXT_TEXT \ 590 ALIGN_FUNCTION(); \ 591 *(.text.hot TEXT_MAIN .text.fixup .text.unlikely) \ 592 NOINSTR_TEXT \ 593 *(.text..refcount) \ 594 *(.ref.text) \ 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 *(.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(*(.ctors)) \ 701 KEEP(*(SORT(.init_array.*))) \ 702 KEEP(*(.init_array)) \ 703 __ctors_end = .; 704 #else 705 #define KERNEL_CTORS() 706 #endif 707 708 /* init and exit section handling */ 709 #define INIT_DATA \ 710 KEEP(*(SORT(___kentry+*))) \ 711 *(.init.data init.data.*) \ 712 MEM_DISCARD(init.data*) \ 713 KERNEL_CTORS() \ 714 MCOUNT_REC() \ 715 *(.init.rodata .init.rodata.*) \ 716 FTRACE_EVENTS() \ 717 TRACE_SYSCALLS() \ 718 KPROBE_BLACKLIST() \ 719 ERROR_INJECT_WHITELIST() \ 720 MEM_DISCARD(init.rodata) \ 721 CLK_OF_TABLES() \ 722 RESERVEDMEM_OF_TABLES() \ 723 TIMER_OF_TABLES() \ 724 CPU_METHOD_OF_TABLES() \ 725 CPUIDLE_METHOD_OF_TABLES() \ 726 KERNEL_DTB() \ 727 IRQCHIP_OF_MATCH_TABLE() \ 728 ACPI_PROBE_TABLE(irqchip) \ 729 ACPI_PROBE_TABLE(timer) \ 730 THERMAL_TABLE(governor) \ 731 EARLYCON_TABLE() \ 732 LSM_TABLE() \ 733 EARLY_LSM_TABLE() 734 735 #define INIT_TEXT \ 736 *(.init.text .init.text.*) \ 737 *(.text.startup) \ 738 MEM_DISCARD(init.text*) 739 740 #define EXIT_DATA \ 741 *(.exit.data .exit.data.*) \ 742 *(.fini_array .fini_array.*) \ 743 *(.dtors .dtors.*) \ 744 MEM_DISCARD(exit.data*) \ 745 MEM_DISCARD(exit.rodata*) 746 747 #define EXIT_TEXT \ 748 *(.exit.text) \ 749 *(.text.exit) \ 750 MEM_DISCARD(exit.text) 751 752 #define EXIT_CALL \ 753 *(.exitcall.exit) 754 755 /* 756 * bss (Block Started by Symbol) - uninitialized data 757 * zeroed during startup 758 */ 759 #define SBSS(sbss_align) \ 760 . = ALIGN(sbss_align); \ 761 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 762 *(.dynsbss) \ 763 *(SBSS_MAIN) \ 764 *(.scommon) \ 765 } 766 767 /* 768 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 769 * sections to the front of bss. 770 */ 771 #ifndef BSS_FIRST_SECTIONS 772 #define BSS_FIRST_SECTIONS 773 #endif 774 775 #define BSS(bss_align) \ 776 . = ALIGN(bss_align); \ 777 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 778 BSS_FIRST_SECTIONS \ 779 . = ALIGN(PAGE_SIZE); \ 780 *(.bss..page_aligned) \ 781 . = ALIGN(PAGE_SIZE); \ 782 *(.dynbss) \ 783 *(BSS_MAIN) \ 784 *(COMMON) \ 785 } 786 787 /* 788 * DWARF debug sections. 789 * Symbols in the DWARF debugging sections are relative to 790 * the beginning of the section so we begin them at 0. 791 */ 792 #define DWARF_DEBUG \ 793 /* DWARF 1 */ \ 794 .debug 0 : { *(.debug) } \ 795 .line 0 : { *(.line) } \ 796 /* GNU DWARF 1 extensions */ \ 797 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 798 .debug_sfnames 0 : { *(.debug_sfnames) } \ 799 /* DWARF 1.1 and DWARF 2 */ \ 800 .debug_aranges 0 : { *(.debug_aranges) } \ 801 .debug_pubnames 0 : { *(.debug_pubnames) } \ 802 /* DWARF 2 */ \ 803 .debug_info 0 : { *(.debug_info \ 804 .gnu.linkonce.wi.*) } \ 805 .debug_abbrev 0 : { *(.debug_abbrev) } \ 806 .debug_line 0 : { *(.debug_line) } \ 807 .debug_frame 0 : { *(.debug_frame) } \ 808 .debug_str 0 : { *(.debug_str) } \ 809 .debug_loc 0 : { *(.debug_loc) } \ 810 .debug_macinfo 0 : { *(.debug_macinfo) } \ 811 .debug_pubtypes 0 : { *(.debug_pubtypes) } \ 812 /* DWARF 3 */ \ 813 .debug_ranges 0 : { *(.debug_ranges) } \ 814 /* SGI/MIPS DWARF 2 extensions */ \ 815 .debug_weaknames 0 : { *(.debug_weaknames) } \ 816 .debug_funcnames 0 : { *(.debug_funcnames) } \ 817 .debug_typenames 0 : { *(.debug_typenames) } \ 818 .debug_varnames 0 : { *(.debug_varnames) } \ 819 /* GNU DWARF 2 extensions */ \ 820 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \ 821 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \ 822 /* DWARF 4 */ \ 823 .debug_types 0 : { *(.debug_types) } \ 824 /* DWARF 5 */ \ 825 .debug_macro 0 : { *(.debug_macro) } \ 826 .debug_addr 0 : { *(.debug_addr) } 827 828 /* Stabs debugging sections. */ 829 #define STABS_DEBUG \ 830 .stab 0 : { *(.stab) } \ 831 .stabstr 0 : { *(.stabstr) } \ 832 .stab.excl 0 : { *(.stab.excl) } \ 833 .stab.exclstr 0 : { *(.stab.exclstr) } \ 834 .stab.index 0 : { *(.stab.index) } \ 835 .stab.indexstr 0 : { *(.stab.indexstr) } \ 836 .comment 0 : { *(.comment) } 837 838 #ifdef CONFIG_GENERIC_BUG 839 #define BUG_TABLE \ 840 . = ALIGN(8); \ 841 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 842 __start___bug_table = .; \ 843 KEEP(*(__bug_table)) \ 844 __stop___bug_table = .; \ 845 } 846 #else 847 #define BUG_TABLE 848 #endif 849 850 #ifdef CONFIG_UNWINDER_ORC 851 #define ORC_UNWIND_TABLE \ 852 . = ALIGN(4); \ 853 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \ 854 __start_orc_unwind_ip = .; \ 855 KEEP(*(.orc_unwind_ip)) \ 856 __stop_orc_unwind_ip = .; \ 857 } \ 858 . = ALIGN(2); \ 859 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \ 860 __start_orc_unwind = .; \ 861 KEEP(*(.orc_unwind)) \ 862 __stop_orc_unwind = .; \ 863 } \ 864 . = ALIGN(4); \ 865 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \ 866 orc_lookup = .; \ 867 . += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) / \ 868 LOOKUP_BLOCK_SIZE) + 1) * 4; \ 869 orc_lookup_end = .; \ 870 } 871 #else 872 #define ORC_UNWIND_TABLE 873 #endif 874 875 #ifdef CONFIG_PM_TRACE 876 #define TRACEDATA \ 877 . = ALIGN(4); \ 878 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 879 __tracedata_start = .; \ 880 KEEP(*(.tracedata)) \ 881 __tracedata_end = .; \ 882 } 883 #else 884 #define TRACEDATA 885 #endif 886 887 #define NOTES \ 888 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 889 __start_notes = .; \ 890 KEEP(*(.note.*)) \ 891 __stop_notes = .; \ 892 } NOTES_HEADERS \ 893 NOTES_HEADERS_RESTORE 894 895 #define INIT_SETUP(initsetup_align) \ 896 . = ALIGN(initsetup_align); \ 897 __setup_start = .; \ 898 KEEP(*(.init.setup)) \ 899 __setup_end = .; 900 901 #define INIT_CALLS_LEVEL(level) \ 902 __initcall##level##_start = .; \ 903 KEEP(*(.initcall##level##.init)) \ 904 KEEP(*(.initcall##level##s.init)) \ 905 906 #define INIT_CALLS \ 907 __initcall_start = .; \ 908 KEEP(*(.initcallearly.init)) \ 909 INIT_CALLS_LEVEL(0) \ 910 INIT_CALLS_LEVEL(1) \ 911 INIT_CALLS_LEVEL(2) \ 912 INIT_CALLS_LEVEL(3) \ 913 INIT_CALLS_LEVEL(4) \ 914 INIT_CALLS_LEVEL(5) \ 915 INIT_CALLS_LEVEL(rootfs) \ 916 INIT_CALLS_LEVEL(6) \ 917 INIT_CALLS_LEVEL(7) \ 918 __initcall_end = .; 919 920 #define CON_INITCALL \ 921 __con_initcall_start = .; \ 922 KEEP(*(.con_initcall.init)) \ 923 __con_initcall_end = .; 924 925 #ifdef CONFIG_BLK_DEV_INITRD 926 #define INIT_RAM_FS \ 927 . = ALIGN(4); \ 928 __initramfs_start = .; \ 929 KEEP(*(.init.ramfs)) \ 930 . = ALIGN(8); \ 931 KEEP(*(.init.ramfs.info)) 932 #else 933 #define INIT_RAM_FS 934 #endif 935 936 /* 937 * Memory encryption operates on a page basis. Since we need to clear 938 * the memory encryption mask for this section, it needs to be aligned 939 * on a page boundary and be a page-size multiple in length. 940 * 941 * Note: We use a separate section so that only this section gets 942 * decrypted to avoid exposing more than we wish. 943 */ 944 #ifdef CONFIG_AMD_MEM_ENCRYPT 945 #define PERCPU_DECRYPTED_SECTION \ 946 . = ALIGN(PAGE_SIZE); \ 947 *(.data..percpu..decrypted) \ 948 . = ALIGN(PAGE_SIZE); 949 #else 950 #define PERCPU_DECRYPTED_SECTION 951 #endif 952 953 954 /* 955 * Default discarded sections. 956 * 957 * Some archs want to discard exit text/data at runtime rather than 958 * link time due to cross-section references such as alt instructions, 959 * bug table, eh_frame, etc. DISCARDS must be the last of output 960 * section definitions so that such archs put those in earlier section 961 * definitions. 962 */ 963 #ifdef RUNTIME_DISCARD_EXIT 964 #define EXIT_DISCARDS 965 #else 966 #define EXIT_DISCARDS \ 967 EXIT_TEXT \ 968 EXIT_DATA 969 #endif 970 971 #define DISCARDS \ 972 /DISCARD/ : { \ 973 EXIT_DISCARDS \ 974 EXIT_CALL \ 975 *(.discard) \ 976 *(.discard.*) \ 977 *(.modinfo) \ 978 } 979 980 /** 981 * PERCPU_INPUT - the percpu input sections 982 * @cacheline: cacheline size 983 * 984 * The core percpu section names and core symbols which do not rely 985 * directly upon load addresses. 986 * 987 * @cacheline is used to align subsections to avoid false cacheline 988 * sharing between subsections for different purposes. 989 */ 990 #define PERCPU_INPUT(cacheline) \ 991 __per_cpu_start = .; \ 992 *(.data..percpu..first) \ 993 . = ALIGN(PAGE_SIZE); \ 994 *(.data..percpu..page_aligned) \ 995 . = ALIGN(cacheline); \ 996 *(.data..percpu..read_mostly) \ 997 . = ALIGN(cacheline); \ 998 *(.data..percpu) \ 999 *(.data..percpu..shared_aligned) \ 1000 PERCPU_DECRYPTED_SECTION \ 1001 __per_cpu_end = .; 1002 1003 /** 1004 * PERCPU_VADDR - define output section for percpu area 1005 * @cacheline: cacheline size 1006 * @vaddr: explicit base address (optional) 1007 * @phdr: destination PHDR (optional) 1008 * 1009 * Macro which expands to output section for percpu area. 1010 * 1011 * @cacheline is used to align subsections to avoid false cacheline 1012 * sharing between subsections for different purposes. 1013 * 1014 * If @vaddr is not blank, it specifies explicit base address and all 1015 * percpu symbols will be offset from the given address. If blank, 1016 * @vaddr always equals @laddr + LOAD_OFFSET. 1017 * 1018 * @phdr defines the output PHDR to use if not blank. Be warned that 1019 * output PHDR is sticky. If @phdr is specified, the next output 1020 * section in the linker script will go there too. @phdr should have 1021 * a leading colon. 1022 * 1023 * Note that this macros defines __per_cpu_load as an absolute symbol. 1024 * If there is no need to put the percpu section at a predetermined 1025 * address, use PERCPU_SECTION. 1026 */ 1027 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 1028 __per_cpu_load = .; \ 1029 .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \ 1030 PERCPU_INPUT(cacheline) \ 1031 } phdr \ 1032 . = __per_cpu_load + SIZEOF(.data..percpu); 1033 1034 /** 1035 * PERCPU_SECTION - define output section for percpu area, simple version 1036 * @cacheline: cacheline size 1037 * 1038 * Align to PAGE_SIZE and outputs output section for percpu area. This 1039 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 1040 * __per_cpu_start will be identical. 1041 * 1042 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 1043 * except that __per_cpu_load is defined as a relative symbol against 1044 * .data..percpu which is required for relocatable x86_32 configuration. 1045 */ 1046 #define PERCPU_SECTION(cacheline) \ 1047 . = ALIGN(PAGE_SIZE); \ 1048 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 1049 __per_cpu_load = .; \ 1050 PERCPU_INPUT(cacheline) \ 1051 } 1052 1053 1054 /* 1055 * Definition of the high level *_SECTION macros 1056 * They will fit only a subset of the architectures 1057 */ 1058 1059 1060 /* 1061 * Writeable data. 1062 * All sections are combined in a single .data section. 1063 * The sections following CONSTRUCTORS are arranged so their 1064 * typical alignment matches. 1065 * A cacheline is typical/always less than a PAGE_SIZE so 1066 * the sections that has this restriction (or similar) 1067 * is located before the ones requiring PAGE_SIZE alignment. 1068 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 1069 * matches the requirement of PAGE_ALIGNED_DATA. 1070 * 1071 * use 0 as page_align if page_aligned data is not used */ 1072 #define RW_DATA(cacheline, pagealigned, inittask) \ 1073 . = ALIGN(PAGE_SIZE); \ 1074 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 1075 INIT_TASK_DATA(inittask) \ 1076 NOSAVE_DATA \ 1077 PAGE_ALIGNED_DATA(pagealigned) \ 1078 CACHELINE_ALIGNED_DATA(cacheline) \ 1079 READ_MOSTLY_DATA(cacheline) \ 1080 DATA_DATA \ 1081 CONSTRUCTORS \ 1082 } \ 1083 BUG_TABLE \ 1084 1085 #define INIT_TEXT_SECTION(inittext_align) \ 1086 . = ALIGN(inittext_align); \ 1087 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 1088 _sinittext = .; \ 1089 INIT_TEXT \ 1090 _einittext = .; \ 1091 } 1092 1093 #define INIT_DATA_SECTION(initsetup_align) \ 1094 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 1095 INIT_DATA \ 1096 INIT_SETUP(initsetup_align) \ 1097 INIT_CALLS \ 1098 CON_INITCALL \ 1099 INIT_RAM_FS \ 1100 } 1101 1102 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 1103 . = ALIGN(sbss_align); \ 1104 __bss_start = .; \ 1105 SBSS(sbss_align) \ 1106 BSS(bss_align) \ 1107 . = ALIGN(stop_align); \ 1108 __bss_stop = .; 1109