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 * Align to a 32 byte boundary equal to the 113 * alignment gcc 4.5 uses for a struct 114 */ 115 #define STRUCT_ALIGNMENT 32 116 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT) 117 118 /* The actual configuration determine if the init/exit sections 119 * are handled as text/data or they can be discarded (which 120 * often happens at runtime) 121 */ 122 #ifdef CONFIG_HOTPLUG_CPU 123 #define CPU_KEEP(sec) *(.cpu##sec) 124 #define CPU_DISCARD(sec) 125 #else 126 #define CPU_KEEP(sec) 127 #define CPU_DISCARD(sec) *(.cpu##sec) 128 #endif 129 130 #if defined(CONFIG_MEMORY_HOTPLUG) 131 #define MEM_KEEP(sec) *(.mem##sec) 132 #define MEM_DISCARD(sec) 133 #else 134 #define MEM_KEEP(sec) 135 #define MEM_DISCARD(sec) *(.mem##sec) 136 #endif 137 138 #ifdef CONFIG_FTRACE_MCOUNT_RECORD 139 /* 140 * The ftrace call sites are logged to a section whose name depends on the 141 * compiler option used. A given kernel image will only use one, AKA 142 * FTRACE_CALLSITE_SECTION. We capture all of them here to avoid header 143 * dependencies for FTRACE_CALLSITE_SECTION's definition. 144 * 145 * Need to also make ftrace_stub_graph point to ftrace_stub 146 * so that the same stub location may have different protocols 147 * and not mess up with C verifiers. 148 */ 149 #define MCOUNT_REC() . = ALIGN(8); \ 150 __start_mcount_loc = .; \ 151 KEEP(*(__mcount_loc)) \ 152 KEEP(*(__patchable_function_entries)) \ 153 __stop_mcount_loc = .; \ 154 ftrace_stub_graph = ftrace_stub; 155 #else 156 # ifdef CONFIG_FUNCTION_TRACER 157 # define MCOUNT_REC() ftrace_stub_graph = ftrace_stub; 158 # else 159 # define MCOUNT_REC() 160 # endif 161 #endif 162 163 #ifdef CONFIG_TRACE_BRANCH_PROFILING 164 #define LIKELY_PROFILE() __start_annotated_branch_profile = .; \ 165 KEEP(*(_ftrace_annotated_branch)) \ 166 __stop_annotated_branch_profile = .; 167 #else 168 #define LIKELY_PROFILE() 169 #endif 170 171 #ifdef CONFIG_PROFILE_ALL_BRANCHES 172 #define BRANCH_PROFILE() __start_branch_profile = .; \ 173 KEEP(*(_ftrace_branch)) \ 174 __stop_branch_profile = .; 175 #else 176 #define BRANCH_PROFILE() 177 #endif 178 179 #ifdef CONFIG_KPROBES 180 #define KPROBE_BLACKLIST() . = ALIGN(8); \ 181 __start_kprobe_blacklist = .; \ 182 KEEP(*(_kprobe_blacklist)) \ 183 __stop_kprobe_blacklist = .; 184 #else 185 #define KPROBE_BLACKLIST() 186 #endif 187 188 #ifdef CONFIG_FUNCTION_ERROR_INJECTION 189 #define ERROR_INJECT_WHITELIST() STRUCT_ALIGN(); \ 190 __start_error_injection_whitelist = .; \ 191 KEEP(*(_error_injection_whitelist)) \ 192 __stop_error_injection_whitelist = .; 193 #else 194 #define ERROR_INJECT_WHITELIST() 195 #endif 196 197 #ifdef CONFIG_EVENT_TRACING 198 #define FTRACE_EVENTS() . = ALIGN(8); \ 199 __start_ftrace_events = .; \ 200 KEEP(*(_ftrace_events)) \ 201 __stop_ftrace_events = .; \ 202 __start_ftrace_eval_maps = .; \ 203 KEEP(*(_ftrace_eval_map)) \ 204 __stop_ftrace_eval_maps = .; 205 #else 206 #define FTRACE_EVENTS() 207 #endif 208 209 #ifdef CONFIG_TRACING 210 #define TRACE_PRINTKS() __start___trace_bprintk_fmt = .; \ 211 KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \ 212 __stop___trace_bprintk_fmt = .; 213 #define TRACEPOINT_STR() __start___tracepoint_str = .; \ 214 KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \ 215 __stop___tracepoint_str = .; 216 #else 217 #define TRACE_PRINTKS() 218 #define TRACEPOINT_STR() 219 #endif 220 221 #ifdef CONFIG_FTRACE_SYSCALLS 222 #define TRACE_SYSCALLS() . = ALIGN(8); \ 223 __start_syscalls_metadata = .; \ 224 KEEP(*(__syscalls_metadata)) \ 225 __stop_syscalls_metadata = .; 226 #else 227 #define TRACE_SYSCALLS() 228 #endif 229 230 #ifdef CONFIG_BPF_EVENTS 231 #define BPF_RAW_TP() STRUCT_ALIGN(); \ 232 __start__bpf_raw_tp = .; \ 233 KEEP(*(__bpf_raw_tp_map)) \ 234 __stop__bpf_raw_tp = .; 235 #else 236 #define BPF_RAW_TP() 237 #endif 238 239 #ifdef CONFIG_SERIAL_EARLYCON 240 #define EARLYCON_TABLE() . = ALIGN(8); \ 241 __earlycon_table = .; \ 242 KEEP(*(__earlycon_table)) \ 243 __earlycon_table_end = .; 244 #else 245 #define EARLYCON_TABLE() 246 #endif 247 248 #ifdef CONFIG_SECURITY 249 #define LSM_TABLE() . = ALIGN(8); \ 250 __start_lsm_info = .; \ 251 KEEP(*(.lsm_info.init)) \ 252 __end_lsm_info = .; 253 #define EARLY_LSM_TABLE() . = ALIGN(8); \ 254 __start_early_lsm_info = .; \ 255 KEEP(*(.early_lsm_info.init)) \ 256 __end_early_lsm_info = .; 257 #else 258 #define LSM_TABLE() 259 #define EARLY_LSM_TABLE() 260 #endif 261 262 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name) 263 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name) 264 #define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name) 265 #define _OF_TABLE_0(name) 266 #define _OF_TABLE_1(name) \ 267 . = ALIGN(8); \ 268 __##name##_of_table = .; \ 269 KEEP(*(__##name##_of_table)) \ 270 KEEP(*(__##name##_of_table_end)) 271 272 #define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer) 273 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip) 274 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk) 275 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem) 276 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method) 277 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method) 278 279 #ifdef CONFIG_ACPI 280 #define ACPI_PROBE_TABLE(name) \ 281 . = ALIGN(8); \ 282 __##name##_acpi_probe_table = .; \ 283 KEEP(*(__##name##_acpi_probe_table)) \ 284 __##name##_acpi_probe_table_end = .; 285 #else 286 #define ACPI_PROBE_TABLE(name) 287 #endif 288 289 #ifdef CONFIG_THERMAL 290 #define THERMAL_TABLE(name) \ 291 . = ALIGN(8); \ 292 __##name##_thermal_table = .; \ 293 KEEP(*(__##name##_thermal_table)) \ 294 __##name##_thermal_table_end = .; 295 #else 296 #define THERMAL_TABLE(name) 297 #endif 298 299 #define KERNEL_DTB() \ 300 STRUCT_ALIGN(); \ 301 __dtb_start = .; \ 302 KEEP(*(.dtb.init.rodata)) \ 303 __dtb_end = .; 304 305 /* 306 * .data section 307 */ 308 #define DATA_DATA \ 309 *(.xiptext) \ 310 *(DATA_MAIN) \ 311 *(.ref.data) \ 312 *(.data..shared_aligned) /* percpu related */ \ 313 MEM_KEEP(init.data*) \ 314 MEM_KEEP(exit.data*) \ 315 *(.data.unlikely) \ 316 __start_once = .; \ 317 *(.data.once) \ 318 __end_once = .; \ 319 STRUCT_ALIGN(); \ 320 *(__tracepoints) \ 321 /* implement dynamic printk debug */ \ 322 . = ALIGN(8); \ 323 __start___verbose = .; \ 324 KEEP(*(__verbose)) \ 325 __stop___verbose = .; \ 326 LIKELY_PROFILE() \ 327 BRANCH_PROFILE() \ 328 TRACE_PRINTKS() \ 329 BPF_RAW_TP() \ 330 TRACEPOINT_STR() 331 332 /* 333 * Data section helpers 334 */ 335 #define NOSAVE_DATA \ 336 . = ALIGN(PAGE_SIZE); \ 337 __nosave_begin = .; \ 338 *(.data..nosave) \ 339 . = ALIGN(PAGE_SIZE); \ 340 __nosave_end = .; 341 342 #define PAGE_ALIGNED_DATA(page_align) \ 343 . = ALIGN(page_align); \ 344 *(.data..page_aligned) \ 345 . = ALIGN(page_align); 346 347 #define READ_MOSTLY_DATA(align) \ 348 . = ALIGN(align); \ 349 *(.data..read_mostly) \ 350 . = ALIGN(align); 351 352 #define CACHELINE_ALIGNED_DATA(align) \ 353 . = ALIGN(align); \ 354 *(.data..cacheline_aligned) 355 356 #define INIT_TASK_DATA(align) \ 357 . = ALIGN(align); \ 358 __start_init_task = .; \ 359 init_thread_union = .; \ 360 init_stack = .; \ 361 KEEP(*(.data..init_task)) \ 362 KEEP(*(.data..init_thread_info)) \ 363 . = __start_init_task + THREAD_SIZE; \ 364 __end_init_task = .; 365 366 #define JUMP_TABLE_DATA \ 367 . = ALIGN(8); \ 368 __start___jump_table = .; \ 369 KEEP(*(__jump_table)) \ 370 __stop___jump_table = .; 371 372 /* 373 * Allow architectures to handle ro_after_init data on their 374 * own by defining an empty RO_AFTER_INIT_DATA. 375 */ 376 #ifndef RO_AFTER_INIT_DATA 377 #define RO_AFTER_INIT_DATA \ 378 __start_ro_after_init = .; \ 379 *(.data..ro_after_init) \ 380 JUMP_TABLE_DATA \ 381 __end_ro_after_init = .; 382 #endif 383 384 /* 385 * Read only Data 386 */ 387 #define RO_DATA(align) \ 388 . = ALIGN((align)); \ 389 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 390 __start_rodata = .; \ 391 *(.rodata) *(.rodata.*) \ 392 RO_AFTER_INIT_DATA /* Read only after init */ \ 393 . = ALIGN(8); \ 394 __start___tracepoints_ptrs = .; \ 395 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \ 396 __stop___tracepoints_ptrs = .; \ 397 *(__tracepoints_strings)/* Tracepoints: strings */ \ 398 } \ 399 \ 400 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 401 *(.rodata1) \ 402 } \ 403 \ 404 /* PCI quirks */ \ 405 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 406 __start_pci_fixups_early = .; \ 407 KEEP(*(.pci_fixup_early)) \ 408 __end_pci_fixups_early = .; \ 409 __start_pci_fixups_header = .; \ 410 KEEP(*(.pci_fixup_header)) \ 411 __end_pci_fixups_header = .; \ 412 __start_pci_fixups_final = .; \ 413 KEEP(*(.pci_fixup_final)) \ 414 __end_pci_fixups_final = .; \ 415 __start_pci_fixups_enable = .; \ 416 KEEP(*(.pci_fixup_enable)) \ 417 __end_pci_fixups_enable = .; \ 418 __start_pci_fixups_resume = .; \ 419 KEEP(*(.pci_fixup_resume)) \ 420 __end_pci_fixups_resume = .; \ 421 __start_pci_fixups_resume_early = .; \ 422 KEEP(*(.pci_fixup_resume_early)) \ 423 __end_pci_fixups_resume_early = .; \ 424 __start_pci_fixups_suspend = .; \ 425 KEEP(*(.pci_fixup_suspend)) \ 426 __end_pci_fixups_suspend = .; \ 427 __start_pci_fixups_suspend_late = .; \ 428 KEEP(*(.pci_fixup_suspend_late)) \ 429 __end_pci_fixups_suspend_late = .; \ 430 } \ 431 \ 432 /* Built-in firmware blobs */ \ 433 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \ 434 __start_builtin_fw = .; \ 435 KEEP(*(.builtin_fw)) \ 436 __end_builtin_fw = .; \ 437 } \ 438 \ 439 TRACEDATA \ 440 \ 441 /* Kernel symbol table: Normal symbols */ \ 442 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 443 __start___ksymtab = .; \ 444 KEEP(*(SORT(___ksymtab+*))) \ 445 __stop___ksymtab = .; \ 446 } \ 447 \ 448 /* Kernel symbol table: GPL-only symbols */ \ 449 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 450 __start___ksymtab_gpl = .; \ 451 KEEP(*(SORT(___ksymtab_gpl+*))) \ 452 __stop___ksymtab_gpl = .; \ 453 } \ 454 \ 455 /* Kernel symbol table: Normal unused symbols */ \ 456 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \ 457 __start___ksymtab_unused = .; \ 458 KEEP(*(SORT(___ksymtab_unused+*))) \ 459 __stop___ksymtab_unused = .; \ 460 } \ 461 \ 462 /* Kernel symbol table: GPL-only unused symbols */ \ 463 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \ 464 __start___ksymtab_unused_gpl = .; \ 465 KEEP(*(SORT(___ksymtab_unused_gpl+*))) \ 466 __stop___ksymtab_unused_gpl = .; \ 467 } \ 468 \ 469 /* Kernel symbol table: GPL-future-only symbols */ \ 470 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \ 471 __start___ksymtab_gpl_future = .; \ 472 KEEP(*(SORT(___ksymtab_gpl_future+*))) \ 473 __stop___ksymtab_gpl_future = .; \ 474 } \ 475 \ 476 /* Kernel symbol table: Normal symbols */ \ 477 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 478 __start___kcrctab = .; \ 479 KEEP(*(SORT(___kcrctab+*))) \ 480 __stop___kcrctab = .; \ 481 } \ 482 \ 483 /* Kernel symbol table: GPL-only symbols */ \ 484 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 485 __start___kcrctab_gpl = .; \ 486 KEEP(*(SORT(___kcrctab_gpl+*))) \ 487 __stop___kcrctab_gpl = .; \ 488 } \ 489 \ 490 /* Kernel symbol table: Normal unused symbols */ \ 491 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \ 492 __start___kcrctab_unused = .; \ 493 KEEP(*(SORT(___kcrctab_unused+*))) \ 494 __stop___kcrctab_unused = .; \ 495 } \ 496 \ 497 /* Kernel symbol table: GPL-only unused symbols */ \ 498 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \ 499 __start___kcrctab_unused_gpl = .; \ 500 KEEP(*(SORT(___kcrctab_unused_gpl+*))) \ 501 __stop___kcrctab_unused_gpl = .; \ 502 } \ 503 \ 504 /* Kernel symbol table: GPL-future-only symbols */ \ 505 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \ 506 __start___kcrctab_gpl_future = .; \ 507 KEEP(*(SORT(___kcrctab_gpl_future+*))) \ 508 __stop___kcrctab_gpl_future = .; \ 509 } \ 510 \ 511 /* Kernel symbol table: strings */ \ 512 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 513 *(__ksymtab_strings) \ 514 } \ 515 \ 516 /* __*init sections */ \ 517 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 518 *(.ref.rodata) \ 519 MEM_KEEP(init.rodata) \ 520 MEM_KEEP(exit.rodata) \ 521 } \ 522 \ 523 /* Built-in module parameters. */ \ 524 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 525 __start___param = .; \ 526 KEEP(*(__param)) \ 527 __stop___param = .; \ 528 } \ 529 \ 530 /* Built-in module versions. */ \ 531 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 532 __start___modver = .; \ 533 KEEP(*(__modver)) \ 534 __stop___modver = .; \ 535 } \ 536 \ 537 RO_EXCEPTION_TABLE \ 538 NOTES \ 539 BTF \ 540 \ 541 . = ALIGN((align)); \ 542 __end_rodata = .; 543 544 /* 545 * Non-instrumentable text section 546 */ 547 #define NOINSTR_TEXT \ 548 ALIGN_FUNCTION(); \ 549 __noinstr_text_start = .; \ 550 *(.noinstr.text) \ 551 __noinstr_text_end = .; 552 553 /* 554 * .text section. Map to function alignment to avoid address changes 555 * during second ld run in second ld pass when generating System.map 556 * 557 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead 558 * code elimination is enabled, so these sections should be converted 559 * to use ".." first. 560 */ 561 #define TEXT_TEXT \ 562 ALIGN_FUNCTION(); \ 563 *(.text.hot TEXT_MAIN .text.fixup .text.unlikely) \ 564 NOINSTR_TEXT \ 565 *(.text..refcount) \ 566 *(.ref.text) \ 567 MEM_KEEP(init.text*) \ 568 MEM_KEEP(exit.text*) \ 569 570 571 /* sched.text is aling to function alignment to secure we have same 572 * address even at second ld pass when generating System.map */ 573 #define SCHED_TEXT \ 574 ALIGN_FUNCTION(); \ 575 __sched_text_start = .; \ 576 *(.sched.text) \ 577 __sched_text_end = .; 578 579 /* spinlock.text is aling to function alignment to secure we have same 580 * address even at second ld pass when generating System.map */ 581 #define LOCK_TEXT \ 582 ALIGN_FUNCTION(); \ 583 __lock_text_start = .; \ 584 *(.spinlock.text) \ 585 __lock_text_end = .; 586 587 #define CPUIDLE_TEXT \ 588 ALIGN_FUNCTION(); \ 589 __cpuidle_text_start = .; \ 590 *(.cpuidle.text) \ 591 __cpuidle_text_end = .; 592 593 #define KPROBES_TEXT \ 594 ALIGN_FUNCTION(); \ 595 __kprobes_text_start = .; \ 596 *(.kprobes.text) \ 597 __kprobes_text_end = .; 598 599 #define ENTRY_TEXT \ 600 ALIGN_FUNCTION(); \ 601 __entry_text_start = .; \ 602 *(.entry.text) \ 603 __entry_text_end = .; 604 605 #define IRQENTRY_TEXT \ 606 ALIGN_FUNCTION(); \ 607 __irqentry_text_start = .; \ 608 *(.irqentry.text) \ 609 __irqentry_text_end = .; 610 611 #define SOFTIRQENTRY_TEXT \ 612 ALIGN_FUNCTION(); \ 613 __softirqentry_text_start = .; \ 614 *(.softirqentry.text) \ 615 __softirqentry_text_end = .; 616 617 /* Section used for early init (in .S files) */ 618 #define HEAD_TEXT KEEP(*(.head.text)) 619 620 #define HEAD_TEXT_SECTION \ 621 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 622 HEAD_TEXT \ 623 } 624 625 /* 626 * Exception table 627 */ 628 #define EXCEPTION_TABLE(align) \ 629 . = ALIGN(align); \ 630 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 631 __start___ex_table = .; \ 632 KEEP(*(__ex_table)) \ 633 __stop___ex_table = .; \ 634 } 635 636 /* 637 * .BTF 638 */ 639 #ifdef CONFIG_DEBUG_INFO_BTF 640 #define BTF \ 641 .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \ 642 __start_BTF = .; \ 643 *(.BTF) \ 644 __stop_BTF = .; \ 645 } \ 646 . = ALIGN(4); \ 647 .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) { \ 648 *(.BTF_ids) \ 649 } 650 #else 651 #define BTF 652 #endif 653 654 /* 655 * Init task 656 */ 657 #define INIT_TASK_DATA_SECTION(align) \ 658 . = ALIGN(align); \ 659 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 660 INIT_TASK_DATA(align) \ 661 } 662 663 #ifdef CONFIG_CONSTRUCTORS 664 #define KERNEL_CTORS() . = ALIGN(8); \ 665 __ctors_start = .; \ 666 KEEP(*(.ctors)) \ 667 KEEP(*(SORT(.init_array.*))) \ 668 KEEP(*(.init_array)) \ 669 __ctors_end = .; 670 #else 671 #define KERNEL_CTORS() 672 #endif 673 674 /* init and exit section handling */ 675 #define INIT_DATA \ 676 KEEP(*(SORT(___kentry+*))) \ 677 *(.init.data init.data.*) \ 678 MEM_DISCARD(init.data*) \ 679 KERNEL_CTORS() \ 680 MCOUNT_REC() \ 681 *(.init.rodata .init.rodata.*) \ 682 FTRACE_EVENTS() \ 683 TRACE_SYSCALLS() \ 684 KPROBE_BLACKLIST() \ 685 ERROR_INJECT_WHITELIST() \ 686 MEM_DISCARD(init.rodata) \ 687 CLK_OF_TABLES() \ 688 RESERVEDMEM_OF_TABLES() \ 689 TIMER_OF_TABLES() \ 690 CPU_METHOD_OF_TABLES() \ 691 CPUIDLE_METHOD_OF_TABLES() \ 692 KERNEL_DTB() \ 693 IRQCHIP_OF_MATCH_TABLE() \ 694 ACPI_PROBE_TABLE(irqchip) \ 695 ACPI_PROBE_TABLE(timer) \ 696 THERMAL_TABLE(governor) \ 697 EARLYCON_TABLE() \ 698 LSM_TABLE() \ 699 EARLY_LSM_TABLE() 700 701 #define INIT_TEXT \ 702 *(.init.text .init.text.*) \ 703 *(.text.startup) \ 704 MEM_DISCARD(init.text*) 705 706 #define EXIT_DATA \ 707 *(.exit.data .exit.data.*) \ 708 *(.fini_array .fini_array.*) \ 709 *(.dtors .dtors.*) \ 710 MEM_DISCARD(exit.data*) \ 711 MEM_DISCARD(exit.rodata*) 712 713 #define EXIT_TEXT \ 714 *(.exit.text) \ 715 *(.text.exit) \ 716 MEM_DISCARD(exit.text) 717 718 #define EXIT_CALL \ 719 *(.exitcall.exit) 720 721 /* 722 * bss (Block Started by Symbol) - uninitialized data 723 * zeroed during startup 724 */ 725 #define SBSS(sbss_align) \ 726 . = ALIGN(sbss_align); \ 727 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 728 *(.dynsbss) \ 729 *(SBSS_MAIN) \ 730 *(.scommon) \ 731 } 732 733 /* 734 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 735 * sections to the front of bss. 736 */ 737 #ifndef BSS_FIRST_SECTIONS 738 #define BSS_FIRST_SECTIONS 739 #endif 740 741 #define BSS(bss_align) \ 742 . = ALIGN(bss_align); \ 743 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 744 BSS_FIRST_SECTIONS \ 745 . = ALIGN(PAGE_SIZE); \ 746 *(.bss..page_aligned) \ 747 . = ALIGN(PAGE_SIZE); \ 748 *(.dynbss) \ 749 *(BSS_MAIN) \ 750 *(COMMON) \ 751 } 752 753 /* 754 * DWARF debug sections. 755 * Symbols in the DWARF debugging sections are relative to 756 * the beginning of the section so we begin them at 0. 757 */ 758 #define DWARF_DEBUG \ 759 /* DWARF 1 */ \ 760 .debug 0 : { *(.debug) } \ 761 .line 0 : { *(.line) } \ 762 /* GNU DWARF 1 extensions */ \ 763 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 764 .debug_sfnames 0 : { *(.debug_sfnames) } \ 765 /* DWARF 1.1 and DWARF 2 */ \ 766 .debug_aranges 0 : { *(.debug_aranges) } \ 767 .debug_pubnames 0 : { *(.debug_pubnames) } \ 768 /* DWARF 2 */ \ 769 .debug_info 0 : { *(.debug_info \ 770 .gnu.linkonce.wi.*) } \ 771 .debug_abbrev 0 : { *(.debug_abbrev) } \ 772 .debug_line 0 : { *(.debug_line) } \ 773 .debug_frame 0 : { *(.debug_frame) } \ 774 .debug_str 0 : { *(.debug_str) } \ 775 .debug_loc 0 : { *(.debug_loc) } \ 776 .debug_macinfo 0 : { *(.debug_macinfo) } \ 777 .debug_pubtypes 0 : { *(.debug_pubtypes) } \ 778 /* DWARF 3 */ \ 779 .debug_ranges 0 : { *(.debug_ranges) } \ 780 /* SGI/MIPS DWARF 2 extensions */ \ 781 .debug_weaknames 0 : { *(.debug_weaknames) } \ 782 .debug_funcnames 0 : { *(.debug_funcnames) } \ 783 .debug_typenames 0 : { *(.debug_typenames) } \ 784 .debug_varnames 0 : { *(.debug_varnames) } \ 785 /* GNU DWARF 2 extensions */ \ 786 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \ 787 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \ 788 /* DWARF 4 */ \ 789 .debug_types 0 : { *(.debug_types) } \ 790 /* DWARF 5 */ \ 791 .debug_macro 0 : { *(.debug_macro) } \ 792 .debug_addr 0 : { *(.debug_addr) } 793 794 /* Stabs debugging sections. */ 795 #define STABS_DEBUG \ 796 .stab 0 : { *(.stab) } \ 797 .stabstr 0 : { *(.stabstr) } \ 798 .stab.excl 0 : { *(.stab.excl) } \ 799 .stab.exclstr 0 : { *(.stab.exclstr) } \ 800 .stab.index 0 : { *(.stab.index) } \ 801 .stab.indexstr 0 : { *(.stab.indexstr) } \ 802 .comment 0 : { *(.comment) } 803 804 #ifdef CONFIG_GENERIC_BUG 805 #define BUG_TABLE \ 806 . = ALIGN(8); \ 807 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 808 __start___bug_table = .; \ 809 KEEP(*(__bug_table)) \ 810 __stop___bug_table = .; \ 811 } 812 #else 813 #define BUG_TABLE 814 #endif 815 816 #ifdef CONFIG_UNWINDER_ORC 817 #define ORC_UNWIND_TABLE \ 818 . = ALIGN(4); \ 819 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \ 820 __start_orc_unwind_ip = .; \ 821 KEEP(*(.orc_unwind_ip)) \ 822 __stop_orc_unwind_ip = .; \ 823 } \ 824 . = ALIGN(2); \ 825 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \ 826 __start_orc_unwind = .; \ 827 KEEP(*(.orc_unwind)) \ 828 __stop_orc_unwind = .; \ 829 } \ 830 . = ALIGN(4); \ 831 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \ 832 orc_lookup = .; \ 833 . += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) / \ 834 LOOKUP_BLOCK_SIZE) + 1) * 4; \ 835 orc_lookup_end = .; \ 836 } 837 #else 838 #define ORC_UNWIND_TABLE 839 #endif 840 841 #ifdef CONFIG_PM_TRACE 842 #define TRACEDATA \ 843 . = ALIGN(4); \ 844 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 845 __tracedata_start = .; \ 846 KEEP(*(.tracedata)) \ 847 __tracedata_end = .; \ 848 } 849 #else 850 #define TRACEDATA 851 #endif 852 853 #define NOTES \ 854 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 855 __start_notes = .; \ 856 KEEP(*(.note.*)) \ 857 __stop_notes = .; \ 858 } NOTES_HEADERS \ 859 NOTES_HEADERS_RESTORE 860 861 #define INIT_SETUP(initsetup_align) \ 862 . = ALIGN(initsetup_align); \ 863 __setup_start = .; \ 864 KEEP(*(.init.setup)) \ 865 __setup_end = .; 866 867 #define INIT_CALLS_LEVEL(level) \ 868 __initcall##level##_start = .; \ 869 KEEP(*(.initcall##level##.init)) \ 870 KEEP(*(.initcall##level##s.init)) \ 871 872 #define INIT_CALLS \ 873 __initcall_start = .; \ 874 KEEP(*(.initcallearly.init)) \ 875 INIT_CALLS_LEVEL(0) \ 876 INIT_CALLS_LEVEL(1) \ 877 INIT_CALLS_LEVEL(2) \ 878 INIT_CALLS_LEVEL(3) \ 879 INIT_CALLS_LEVEL(4) \ 880 INIT_CALLS_LEVEL(5) \ 881 INIT_CALLS_LEVEL(rootfs) \ 882 INIT_CALLS_LEVEL(6) \ 883 INIT_CALLS_LEVEL(7) \ 884 __initcall_end = .; 885 886 #define CON_INITCALL \ 887 __con_initcall_start = .; \ 888 KEEP(*(.con_initcall.init)) \ 889 __con_initcall_end = .; 890 891 #ifdef CONFIG_BLK_DEV_INITRD 892 #define INIT_RAM_FS \ 893 . = ALIGN(4); \ 894 __initramfs_start = .; \ 895 KEEP(*(.init.ramfs)) \ 896 . = ALIGN(8); \ 897 KEEP(*(.init.ramfs.info)) 898 #else 899 #define INIT_RAM_FS 900 #endif 901 902 /* 903 * Memory encryption operates on a page basis. Since we need to clear 904 * the memory encryption mask for this section, it needs to be aligned 905 * on a page boundary and be a page-size multiple in length. 906 * 907 * Note: We use a separate section so that only this section gets 908 * decrypted to avoid exposing more than we wish. 909 */ 910 #ifdef CONFIG_AMD_MEM_ENCRYPT 911 #define PERCPU_DECRYPTED_SECTION \ 912 . = ALIGN(PAGE_SIZE); \ 913 *(.data..percpu..decrypted) \ 914 . = ALIGN(PAGE_SIZE); 915 #else 916 #define PERCPU_DECRYPTED_SECTION 917 #endif 918 919 920 /* 921 * Default discarded sections. 922 * 923 * Some archs want to discard exit text/data at runtime rather than 924 * link time due to cross-section references such as alt instructions, 925 * bug table, eh_frame, etc. DISCARDS must be the last of output 926 * section definitions so that such archs put those in earlier section 927 * definitions. 928 */ 929 #ifdef RUNTIME_DISCARD_EXIT 930 #define EXIT_DISCARDS 931 #else 932 #define EXIT_DISCARDS \ 933 EXIT_TEXT \ 934 EXIT_DATA 935 #endif 936 937 #define DISCARDS \ 938 /DISCARD/ : { \ 939 EXIT_DISCARDS \ 940 EXIT_CALL \ 941 *(.discard) \ 942 *(.discard.*) \ 943 *(.modinfo) \ 944 } 945 946 /** 947 * PERCPU_INPUT - the percpu input sections 948 * @cacheline: cacheline size 949 * 950 * The core percpu section names and core symbols which do not rely 951 * directly upon load addresses. 952 * 953 * @cacheline is used to align subsections to avoid false cacheline 954 * sharing between subsections for different purposes. 955 */ 956 #define PERCPU_INPUT(cacheline) \ 957 __per_cpu_start = .; \ 958 *(.data..percpu..first) \ 959 . = ALIGN(PAGE_SIZE); \ 960 *(.data..percpu..page_aligned) \ 961 . = ALIGN(cacheline); \ 962 *(.data..percpu..read_mostly) \ 963 . = ALIGN(cacheline); \ 964 *(.data..percpu) \ 965 *(.data..percpu..shared_aligned) \ 966 PERCPU_DECRYPTED_SECTION \ 967 __per_cpu_end = .; 968 969 /** 970 * PERCPU_VADDR - define output section for percpu area 971 * @cacheline: cacheline size 972 * @vaddr: explicit base address (optional) 973 * @phdr: destination PHDR (optional) 974 * 975 * Macro which expands to output section for percpu area. 976 * 977 * @cacheline is used to align subsections to avoid false cacheline 978 * sharing between subsections for different purposes. 979 * 980 * If @vaddr is not blank, it specifies explicit base address and all 981 * percpu symbols will be offset from the given address. If blank, 982 * @vaddr always equals @laddr + LOAD_OFFSET. 983 * 984 * @phdr defines the output PHDR to use if not blank. Be warned that 985 * output PHDR is sticky. If @phdr is specified, the next output 986 * section in the linker script will go there too. @phdr should have 987 * a leading colon. 988 * 989 * Note that this macros defines __per_cpu_load as an absolute symbol. 990 * If there is no need to put the percpu section at a predetermined 991 * address, use PERCPU_SECTION. 992 */ 993 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 994 __per_cpu_load = .; \ 995 .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \ 996 PERCPU_INPUT(cacheline) \ 997 } phdr \ 998 . = __per_cpu_load + SIZEOF(.data..percpu); 999 1000 /** 1001 * PERCPU_SECTION - define output section for percpu area, simple version 1002 * @cacheline: cacheline size 1003 * 1004 * Align to PAGE_SIZE and outputs output section for percpu area. This 1005 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 1006 * __per_cpu_start will be identical. 1007 * 1008 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 1009 * except that __per_cpu_load is defined as a relative symbol against 1010 * .data..percpu which is required for relocatable x86_32 configuration. 1011 */ 1012 #define PERCPU_SECTION(cacheline) \ 1013 . = ALIGN(PAGE_SIZE); \ 1014 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 1015 __per_cpu_load = .; \ 1016 PERCPU_INPUT(cacheline) \ 1017 } 1018 1019 1020 /* 1021 * Definition of the high level *_SECTION macros 1022 * They will fit only a subset of the architectures 1023 */ 1024 1025 1026 /* 1027 * Writeable data. 1028 * All sections are combined in a single .data section. 1029 * The sections following CONSTRUCTORS are arranged so their 1030 * typical alignment matches. 1031 * A cacheline is typical/always less than a PAGE_SIZE so 1032 * the sections that has this restriction (or similar) 1033 * is located before the ones requiring PAGE_SIZE alignment. 1034 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 1035 * matches the requirement of PAGE_ALIGNED_DATA. 1036 * 1037 * use 0 as page_align if page_aligned data is not used */ 1038 #define RW_DATA(cacheline, pagealigned, inittask) \ 1039 . = ALIGN(PAGE_SIZE); \ 1040 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 1041 INIT_TASK_DATA(inittask) \ 1042 NOSAVE_DATA \ 1043 PAGE_ALIGNED_DATA(pagealigned) \ 1044 CACHELINE_ALIGNED_DATA(cacheline) \ 1045 READ_MOSTLY_DATA(cacheline) \ 1046 DATA_DATA \ 1047 CONSTRUCTORS \ 1048 } \ 1049 BUG_TABLE \ 1050 1051 #define INIT_TEXT_SECTION(inittext_align) \ 1052 . = ALIGN(inittext_align); \ 1053 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 1054 _sinittext = .; \ 1055 INIT_TEXT \ 1056 _einittext = .; \ 1057 } 1058 1059 #define INIT_DATA_SECTION(initsetup_align) \ 1060 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 1061 INIT_DATA \ 1062 INIT_SETUP(initsetup_align) \ 1063 INIT_CALLS \ 1064 CON_INITCALL \ 1065 INIT_RAM_FS \ 1066 } 1067 1068 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 1069 . = ALIGN(sbss_align); \ 1070 __bss_start = .; \ 1071 SBSS(sbss_align) \ 1072 BSS(bss_align) \ 1073 . = ALIGN(stop_align); \ 1074 __bss_stop = .; 1075