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) 345 346 #define READ_MOSTLY_DATA(align) \ 347 . = ALIGN(align); \ 348 *(.data..read_mostly) \ 349 . = ALIGN(align); 350 351 #define CACHELINE_ALIGNED_DATA(align) \ 352 . = ALIGN(align); \ 353 *(.data..cacheline_aligned) 354 355 #define INIT_TASK_DATA(align) \ 356 . = ALIGN(align); \ 357 __start_init_task = .; \ 358 init_thread_union = .; \ 359 init_stack = .; \ 360 KEEP(*(.data..init_task)) \ 361 KEEP(*(.data..init_thread_info)) \ 362 . = __start_init_task + THREAD_SIZE; \ 363 __end_init_task = .; 364 365 #define JUMP_TABLE_DATA \ 366 . = ALIGN(8); \ 367 __start___jump_table = .; \ 368 KEEP(*(__jump_table)) \ 369 __stop___jump_table = .; 370 371 /* 372 * Allow architectures to handle ro_after_init data on their 373 * own by defining an empty RO_AFTER_INIT_DATA. 374 */ 375 #ifndef RO_AFTER_INIT_DATA 376 #define RO_AFTER_INIT_DATA \ 377 __start_ro_after_init = .; \ 378 *(.data..ro_after_init) \ 379 JUMP_TABLE_DATA \ 380 __end_ro_after_init = .; 381 #endif 382 383 /* 384 * Read only Data 385 */ 386 #define RO_DATA(align) \ 387 . = ALIGN((align)); \ 388 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 389 __start_rodata = .; \ 390 *(.rodata) *(.rodata.*) \ 391 RO_AFTER_INIT_DATA /* Read only after init */ \ 392 . = ALIGN(8); \ 393 __start___tracepoints_ptrs = .; \ 394 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \ 395 __stop___tracepoints_ptrs = .; \ 396 *(__tracepoints_strings)/* Tracepoints: strings */ \ 397 } \ 398 \ 399 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 400 *(.rodata1) \ 401 } \ 402 \ 403 /* PCI quirks */ \ 404 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 405 __start_pci_fixups_early = .; \ 406 KEEP(*(.pci_fixup_early)) \ 407 __end_pci_fixups_early = .; \ 408 __start_pci_fixups_header = .; \ 409 KEEP(*(.pci_fixup_header)) \ 410 __end_pci_fixups_header = .; \ 411 __start_pci_fixups_final = .; \ 412 KEEP(*(.pci_fixup_final)) \ 413 __end_pci_fixups_final = .; \ 414 __start_pci_fixups_enable = .; \ 415 KEEP(*(.pci_fixup_enable)) \ 416 __end_pci_fixups_enable = .; \ 417 __start_pci_fixups_resume = .; \ 418 KEEP(*(.pci_fixup_resume)) \ 419 __end_pci_fixups_resume = .; \ 420 __start_pci_fixups_resume_early = .; \ 421 KEEP(*(.pci_fixup_resume_early)) \ 422 __end_pci_fixups_resume_early = .; \ 423 __start_pci_fixups_suspend = .; \ 424 KEEP(*(.pci_fixup_suspend)) \ 425 __end_pci_fixups_suspend = .; \ 426 __start_pci_fixups_suspend_late = .; \ 427 KEEP(*(.pci_fixup_suspend_late)) \ 428 __end_pci_fixups_suspend_late = .; \ 429 } \ 430 \ 431 /* Built-in firmware blobs */ \ 432 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \ 433 __start_builtin_fw = .; \ 434 KEEP(*(.builtin_fw)) \ 435 __end_builtin_fw = .; \ 436 } \ 437 \ 438 TRACEDATA \ 439 \ 440 /* Kernel symbol table: Normal symbols */ \ 441 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 442 __start___ksymtab = .; \ 443 KEEP(*(SORT(___ksymtab+*))) \ 444 __stop___ksymtab = .; \ 445 } \ 446 \ 447 /* Kernel symbol table: GPL-only symbols */ \ 448 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 449 __start___ksymtab_gpl = .; \ 450 KEEP(*(SORT(___ksymtab_gpl+*))) \ 451 __stop___ksymtab_gpl = .; \ 452 } \ 453 \ 454 /* Kernel symbol table: Normal unused symbols */ \ 455 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \ 456 __start___ksymtab_unused = .; \ 457 KEEP(*(SORT(___ksymtab_unused+*))) \ 458 __stop___ksymtab_unused = .; \ 459 } \ 460 \ 461 /* Kernel symbol table: GPL-only unused symbols */ \ 462 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \ 463 __start___ksymtab_unused_gpl = .; \ 464 KEEP(*(SORT(___ksymtab_unused_gpl+*))) \ 465 __stop___ksymtab_unused_gpl = .; \ 466 } \ 467 \ 468 /* Kernel symbol table: GPL-future-only symbols */ \ 469 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \ 470 __start___ksymtab_gpl_future = .; \ 471 KEEP(*(SORT(___ksymtab_gpl_future+*))) \ 472 __stop___ksymtab_gpl_future = .; \ 473 } \ 474 \ 475 /* Kernel symbol table: Normal symbols */ \ 476 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 477 __start___kcrctab = .; \ 478 KEEP(*(SORT(___kcrctab+*))) \ 479 __stop___kcrctab = .; \ 480 } \ 481 \ 482 /* Kernel symbol table: GPL-only symbols */ \ 483 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 484 __start___kcrctab_gpl = .; \ 485 KEEP(*(SORT(___kcrctab_gpl+*))) \ 486 __stop___kcrctab_gpl = .; \ 487 } \ 488 \ 489 /* Kernel symbol table: Normal unused symbols */ \ 490 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \ 491 __start___kcrctab_unused = .; \ 492 KEEP(*(SORT(___kcrctab_unused+*))) \ 493 __stop___kcrctab_unused = .; \ 494 } \ 495 \ 496 /* Kernel symbol table: GPL-only unused symbols */ \ 497 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \ 498 __start___kcrctab_unused_gpl = .; \ 499 KEEP(*(SORT(___kcrctab_unused_gpl+*))) \ 500 __stop___kcrctab_unused_gpl = .; \ 501 } \ 502 \ 503 /* Kernel symbol table: GPL-future-only symbols */ \ 504 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \ 505 __start___kcrctab_gpl_future = .; \ 506 KEEP(*(SORT(___kcrctab_gpl_future+*))) \ 507 __stop___kcrctab_gpl_future = .; \ 508 } \ 509 \ 510 /* Kernel symbol table: strings */ \ 511 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 512 *(__ksymtab_strings) \ 513 } \ 514 \ 515 /* __*init sections */ \ 516 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 517 *(.ref.rodata) \ 518 MEM_KEEP(init.rodata) \ 519 MEM_KEEP(exit.rodata) \ 520 } \ 521 \ 522 /* Built-in module parameters. */ \ 523 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 524 __start___param = .; \ 525 KEEP(*(__param)) \ 526 __stop___param = .; \ 527 } \ 528 \ 529 /* Built-in module versions. */ \ 530 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 531 __start___modver = .; \ 532 KEEP(*(__modver)) \ 533 __stop___modver = .; \ 534 } \ 535 \ 536 RO_EXCEPTION_TABLE \ 537 NOTES \ 538 BTF \ 539 \ 540 . = ALIGN((align)); \ 541 __end_rodata = .; 542 543 /* 544 * Non-instrumentable text section 545 */ 546 #define NOINSTR_TEXT \ 547 ALIGN_FUNCTION(); \ 548 __noinstr_text_start = .; \ 549 *(.noinstr.text) \ 550 __noinstr_text_end = .; 551 552 /* 553 * .text section. Map to function alignment to avoid address changes 554 * during second ld run in second ld pass when generating System.map 555 * 556 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead 557 * code elimination is enabled, so these sections should be converted 558 * to use ".." first. 559 */ 560 #define TEXT_TEXT \ 561 ALIGN_FUNCTION(); \ 562 *(.text.hot TEXT_MAIN .text.fixup .text.unlikely) \ 563 NOINSTR_TEXT \ 564 *(.text..refcount) \ 565 *(.ref.text) \ 566 MEM_KEEP(init.text*) \ 567 MEM_KEEP(exit.text*) \ 568 569 570 /* sched.text is aling to function alignment to secure we have same 571 * address even at second ld pass when generating System.map */ 572 #define SCHED_TEXT \ 573 ALIGN_FUNCTION(); \ 574 __sched_text_start = .; \ 575 *(.sched.text) \ 576 __sched_text_end = .; 577 578 /* spinlock.text is aling to function alignment to secure we have same 579 * address even at second ld pass when generating System.map */ 580 #define LOCK_TEXT \ 581 ALIGN_FUNCTION(); \ 582 __lock_text_start = .; \ 583 *(.spinlock.text) \ 584 __lock_text_end = .; 585 586 #define CPUIDLE_TEXT \ 587 ALIGN_FUNCTION(); \ 588 __cpuidle_text_start = .; \ 589 *(.cpuidle.text) \ 590 __cpuidle_text_end = .; 591 592 #define KPROBES_TEXT \ 593 ALIGN_FUNCTION(); \ 594 __kprobes_text_start = .; \ 595 *(.kprobes.text) \ 596 __kprobes_text_end = .; 597 598 #define ENTRY_TEXT \ 599 ALIGN_FUNCTION(); \ 600 __entry_text_start = .; \ 601 *(.entry.text) \ 602 __entry_text_end = .; 603 604 #define IRQENTRY_TEXT \ 605 ALIGN_FUNCTION(); \ 606 __irqentry_text_start = .; \ 607 *(.irqentry.text) \ 608 __irqentry_text_end = .; 609 610 #define SOFTIRQENTRY_TEXT \ 611 ALIGN_FUNCTION(); \ 612 __softirqentry_text_start = .; \ 613 *(.softirqentry.text) \ 614 __softirqentry_text_end = .; 615 616 /* Section used for early init (in .S files) */ 617 #define HEAD_TEXT KEEP(*(.head.text)) 618 619 #define HEAD_TEXT_SECTION \ 620 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 621 HEAD_TEXT \ 622 } 623 624 /* 625 * Exception table 626 */ 627 #define EXCEPTION_TABLE(align) \ 628 . = ALIGN(align); \ 629 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 630 __start___ex_table = .; \ 631 KEEP(*(__ex_table)) \ 632 __stop___ex_table = .; \ 633 } 634 635 /* 636 * .BTF 637 */ 638 #ifdef CONFIG_DEBUG_INFO_BTF 639 #define BTF \ 640 .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \ 641 __start_BTF = .; \ 642 *(.BTF) \ 643 __stop_BTF = .; \ 644 } 645 #else 646 #define BTF 647 #endif 648 649 /* 650 * Init task 651 */ 652 #define INIT_TASK_DATA_SECTION(align) \ 653 . = ALIGN(align); \ 654 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 655 INIT_TASK_DATA(align) \ 656 } 657 658 #ifdef CONFIG_CONSTRUCTORS 659 #define KERNEL_CTORS() . = ALIGN(8); \ 660 __ctors_start = .; \ 661 KEEP(*(.ctors)) \ 662 KEEP(*(SORT(.init_array.*))) \ 663 KEEP(*(.init_array)) \ 664 __ctors_end = .; 665 #else 666 #define KERNEL_CTORS() 667 #endif 668 669 /* init and exit section handling */ 670 #define INIT_DATA \ 671 KEEP(*(SORT(___kentry+*))) \ 672 *(.init.data init.data.*) \ 673 MEM_DISCARD(init.data*) \ 674 KERNEL_CTORS() \ 675 MCOUNT_REC() \ 676 *(.init.rodata .init.rodata.*) \ 677 FTRACE_EVENTS() \ 678 TRACE_SYSCALLS() \ 679 KPROBE_BLACKLIST() \ 680 ERROR_INJECT_WHITELIST() \ 681 MEM_DISCARD(init.rodata) \ 682 CLK_OF_TABLES() \ 683 RESERVEDMEM_OF_TABLES() \ 684 TIMER_OF_TABLES() \ 685 CPU_METHOD_OF_TABLES() \ 686 CPUIDLE_METHOD_OF_TABLES() \ 687 KERNEL_DTB() \ 688 IRQCHIP_OF_MATCH_TABLE() \ 689 ACPI_PROBE_TABLE(irqchip) \ 690 ACPI_PROBE_TABLE(timer) \ 691 THERMAL_TABLE(governor) \ 692 EARLYCON_TABLE() \ 693 LSM_TABLE() \ 694 EARLY_LSM_TABLE() 695 696 #define INIT_TEXT \ 697 *(.init.text .init.text.*) \ 698 *(.text.startup) \ 699 MEM_DISCARD(init.text*) 700 701 #define EXIT_DATA \ 702 *(.exit.data .exit.data.*) \ 703 *(.fini_array .fini_array.*) \ 704 *(.dtors .dtors.*) \ 705 MEM_DISCARD(exit.data*) \ 706 MEM_DISCARD(exit.rodata*) 707 708 #define EXIT_TEXT \ 709 *(.exit.text) \ 710 *(.text.exit) \ 711 MEM_DISCARD(exit.text) 712 713 #define EXIT_CALL \ 714 *(.exitcall.exit) 715 716 /* 717 * bss (Block Started by Symbol) - uninitialized data 718 * zeroed during startup 719 */ 720 #define SBSS(sbss_align) \ 721 . = ALIGN(sbss_align); \ 722 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 723 *(.dynsbss) \ 724 *(SBSS_MAIN) \ 725 *(.scommon) \ 726 } 727 728 /* 729 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 730 * sections to the front of bss. 731 */ 732 #ifndef BSS_FIRST_SECTIONS 733 #define BSS_FIRST_SECTIONS 734 #endif 735 736 #define BSS(bss_align) \ 737 . = ALIGN(bss_align); \ 738 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 739 BSS_FIRST_SECTIONS \ 740 *(.bss..page_aligned) \ 741 *(.dynbss) \ 742 *(BSS_MAIN) \ 743 *(COMMON) \ 744 } 745 746 /* 747 * DWARF debug sections. 748 * Symbols in the DWARF debugging sections are relative to 749 * the beginning of the section so we begin them at 0. 750 */ 751 #define DWARF_DEBUG \ 752 /* DWARF 1 */ \ 753 .debug 0 : { *(.debug) } \ 754 .line 0 : { *(.line) } \ 755 /* GNU DWARF 1 extensions */ \ 756 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 757 .debug_sfnames 0 : { *(.debug_sfnames) } \ 758 /* DWARF 1.1 and DWARF 2 */ \ 759 .debug_aranges 0 : { *(.debug_aranges) } \ 760 .debug_pubnames 0 : { *(.debug_pubnames) } \ 761 /* DWARF 2 */ \ 762 .debug_info 0 : { *(.debug_info \ 763 .gnu.linkonce.wi.*) } \ 764 .debug_abbrev 0 : { *(.debug_abbrev) } \ 765 .debug_line 0 : { *(.debug_line) } \ 766 .debug_frame 0 : { *(.debug_frame) } \ 767 .debug_str 0 : { *(.debug_str) } \ 768 .debug_loc 0 : { *(.debug_loc) } \ 769 .debug_macinfo 0 : { *(.debug_macinfo) } \ 770 .debug_pubtypes 0 : { *(.debug_pubtypes) } \ 771 /* DWARF 3 */ \ 772 .debug_ranges 0 : { *(.debug_ranges) } \ 773 /* SGI/MIPS DWARF 2 extensions */ \ 774 .debug_weaknames 0 : { *(.debug_weaknames) } \ 775 .debug_funcnames 0 : { *(.debug_funcnames) } \ 776 .debug_typenames 0 : { *(.debug_typenames) } \ 777 .debug_varnames 0 : { *(.debug_varnames) } \ 778 /* GNU DWARF 2 extensions */ \ 779 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \ 780 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \ 781 /* DWARF 4 */ \ 782 .debug_types 0 : { *(.debug_types) } \ 783 /* DWARF 5 */ \ 784 .debug_macro 0 : { *(.debug_macro) } \ 785 .debug_addr 0 : { *(.debug_addr) } 786 787 /* Stabs debugging sections. */ 788 #define STABS_DEBUG \ 789 .stab 0 : { *(.stab) } \ 790 .stabstr 0 : { *(.stabstr) } \ 791 .stab.excl 0 : { *(.stab.excl) } \ 792 .stab.exclstr 0 : { *(.stab.exclstr) } \ 793 .stab.index 0 : { *(.stab.index) } \ 794 .stab.indexstr 0 : { *(.stab.indexstr) } \ 795 .comment 0 : { *(.comment) } 796 797 #ifdef CONFIG_GENERIC_BUG 798 #define BUG_TABLE \ 799 . = ALIGN(8); \ 800 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 801 __start___bug_table = .; \ 802 KEEP(*(__bug_table)) \ 803 __stop___bug_table = .; \ 804 } 805 #else 806 #define BUG_TABLE 807 #endif 808 809 #ifdef CONFIG_UNWINDER_ORC 810 #define ORC_UNWIND_TABLE \ 811 . = ALIGN(4); \ 812 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \ 813 __start_orc_unwind_ip = .; \ 814 KEEP(*(.orc_unwind_ip)) \ 815 __stop_orc_unwind_ip = .; \ 816 } \ 817 . = ALIGN(2); \ 818 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \ 819 __start_orc_unwind = .; \ 820 KEEP(*(.orc_unwind)) \ 821 __stop_orc_unwind = .; \ 822 } \ 823 . = ALIGN(4); \ 824 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \ 825 orc_lookup = .; \ 826 . += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) / \ 827 LOOKUP_BLOCK_SIZE) + 1) * 4; \ 828 orc_lookup_end = .; \ 829 } 830 #else 831 #define ORC_UNWIND_TABLE 832 #endif 833 834 #ifdef CONFIG_PM_TRACE 835 #define TRACEDATA \ 836 . = ALIGN(4); \ 837 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 838 __tracedata_start = .; \ 839 KEEP(*(.tracedata)) \ 840 __tracedata_end = .; \ 841 } 842 #else 843 #define TRACEDATA 844 #endif 845 846 #define NOTES \ 847 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 848 __start_notes = .; \ 849 KEEP(*(.note.*)) \ 850 __stop_notes = .; \ 851 } NOTES_HEADERS \ 852 NOTES_HEADERS_RESTORE 853 854 #define INIT_SETUP(initsetup_align) \ 855 . = ALIGN(initsetup_align); \ 856 __setup_start = .; \ 857 KEEP(*(.init.setup)) \ 858 __setup_end = .; 859 860 #define INIT_CALLS_LEVEL(level) \ 861 __initcall##level##_start = .; \ 862 KEEP(*(.initcall##level##.init)) \ 863 KEEP(*(.initcall##level##s.init)) \ 864 865 #define INIT_CALLS \ 866 __initcall_start = .; \ 867 KEEP(*(.initcallearly.init)) \ 868 INIT_CALLS_LEVEL(0) \ 869 INIT_CALLS_LEVEL(1) \ 870 INIT_CALLS_LEVEL(2) \ 871 INIT_CALLS_LEVEL(3) \ 872 INIT_CALLS_LEVEL(4) \ 873 INIT_CALLS_LEVEL(5) \ 874 INIT_CALLS_LEVEL(rootfs) \ 875 INIT_CALLS_LEVEL(6) \ 876 INIT_CALLS_LEVEL(7) \ 877 __initcall_end = .; 878 879 #define CON_INITCALL \ 880 __con_initcall_start = .; \ 881 KEEP(*(.con_initcall.init)) \ 882 __con_initcall_end = .; 883 884 #ifdef CONFIG_BLK_DEV_INITRD 885 #define INIT_RAM_FS \ 886 . = ALIGN(4); \ 887 __initramfs_start = .; \ 888 KEEP(*(.init.ramfs)) \ 889 . = ALIGN(8); \ 890 KEEP(*(.init.ramfs.info)) 891 #else 892 #define INIT_RAM_FS 893 #endif 894 895 /* 896 * Memory encryption operates on a page basis. Since we need to clear 897 * the memory encryption mask for this section, it needs to be aligned 898 * on a page boundary and be a page-size multiple in length. 899 * 900 * Note: We use a separate section so that only this section gets 901 * decrypted to avoid exposing more than we wish. 902 */ 903 #ifdef CONFIG_AMD_MEM_ENCRYPT 904 #define PERCPU_DECRYPTED_SECTION \ 905 . = ALIGN(PAGE_SIZE); \ 906 *(.data..percpu..decrypted) \ 907 . = ALIGN(PAGE_SIZE); 908 #else 909 #define PERCPU_DECRYPTED_SECTION 910 #endif 911 912 913 /* 914 * Default discarded sections. 915 * 916 * Some archs want to discard exit text/data at runtime rather than 917 * link time due to cross-section references such as alt instructions, 918 * bug table, eh_frame, etc. DISCARDS must be the last of output 919 * section definitions so that such archs put those in earlier section 920 * definitions. 921 */ 922 #ifdef RUNTIME_DISCARD_EXIT 923 #define EXIT_DISCARDS 924 #else 925 #define EXIT_DISCARDS \ 926 EXIT_TEXT \ 927 EXIT_DATA 928 #endif 929 930 #define DISCARDS \ 931 /DISCARD/ : { \ 932 EXIT_DISCARDS \ 933 EXIT_CALL \ 934 *(.discard) \ 935 *(.discard.*) \ 936 *(.modinfo) \ 937 } 938 939 /** 940 * PERCPU_INPUT - the percpu input sections 941 * @cacheline: cacheline size 942 * 943 * The core percpu section names and core symbols which do not rely 944 * directly upon load addresses. 945 * 946 * @cacheline is used to align subsections to avoid false cacheline 947 * sharing between subsections for different purposes. 948 */ 949 #define PERCPU_INPUT(cacheline) \ 950 __per_cpu_start = .; \ 951 *(.data..percpu..first) \ 952 . = ALIGN(PAGE_SIZE); \ 953 *(.data..percpu..page_aligned) \ 954 . = ALIGN(cacheline); \ 955 *(.data..percpu..read_mostly) \ 956 . = ALIGN(cacheline); \ 957 *(.data..percpu) \ 958 *(.data..percpu..shared_aligned) \ 959 PERCPU_DECRYPTED_SECTION \ 960 __per_cpu_end = .; 961 962 /** 963 * PERCPU_VADDR - define output section for percpu area 964 * @cacheline: cacheline size 965 * @vaddr: explicit base address (optional) 966 * @phdr: destination PHDR (optional) 967 * 968 * Macro which expands to output section for percpu area. 969 * 970 * @cacheline is used to align subsections to avoid false cacheline 971 * sharing between subsections for different purposes. 972 * 973 * If @vaddr is not blank, it specifies explicit base address and all 974 * percpu symbols will be offset from the given address. If blank, 975 * @vaddr always equals @laddr + LOAD_OFFSET. 976 * 977 * @phdr defines the output PHDR to use if not blank. Be warned that 978 * output PHDR is sticky. If @phdr is specified, the next output 979 * section in the linker script will go there too. @phdr should have 980 * a leading colon. 981 * 982 * Note that this macros defines __per_cpu_load as an absolute symbol. 983 * If there is no need to put the percpu section at a predetermined 984 * address, use PERCPU_SECTION. 985 */ 986 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 987 __per_cpu_load = .; \ 988 .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \ 989 PERCPU_INPUT(cacheline) \ 990 } phdr \ 991 . = __per_cpu_load + SIZEOF(.data..percpu); 992 993 /** 994 * PERCPU_SECTION - define output section for percpu area, simple version 995 * @cacheline: cacheline size 996 * 997 * Align to PAGE_SIZE and outputs output section for percpu area. This 998 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 999 * __per_cpu_start will be identical. 1000 * 1001 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 1002 * except that __per_cpu_load is defined as a relative symbol against 1003 * .data..percpu which is required for relocatable x86_32 configuration. 1004 */ 1005 #define PERCPU_SECTION(cacheline) \ 1006 . = ALIGN(PAGE_SIZE); \ 1007 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 1008 __per_cpu_load = .; \ 1009 PERCPU_INPUT(cacheline) \ 1010 } 1011 1012 1013 /* 1014 * Definition of the high level *_SECTION macros 1015 * They will fit only a subset of the architectures 1016 */ 1017 1018 1019 /* 1020 * Writeable data. 1021 * All sections are combined in a single .data section. 1022 * The sections following CONSTRUCTORS are arranged so their 1023 * typical alignment matches. 1024 * A cacheline is typical/always less than a PAGE_SIZE so 1025 * the sections that has this restriction (or similar) 1026 * is located before the ones requiring PAGE_SIZE alignment. 1027 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 1028 * matches the requirement of PAGE_ALIGNED_DATA. 1029 * 1030 * use 0 as page_align if page_aligned data is not used */ 1031 #define RW_DATA(cacheline, pagealigned, inittask) \ 1032 . = ALIGN(PAGE_SIZE); \ 1033 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 1034 INIT_TASK_DATA(inittask) \ 1035 NOSAVE_DATA \ 1036 PAGE_ALIGNED_DATA(pagealigned) \ 1037 CACHELINE_ALIGNED_DATA(cacheline) \ 1038 READ_MOSTLY_DATA(cacheline) \ 1039 DATA_DATA \ 1040 CONSTRUCTORS \ 1041 } \ 1042 BUG_TABLE \ 1043 1044 #define INIT_TEXT_SECTION(inittext_align) \ 1045 . = ALIGN(inittext_align); \ 1046 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 1047 _sinittext = .; \ 1048 INIT_TEXT \ 1049 _einittext = .; \ 1050 } 1051 1052 #define INIT_DATA_SECTION(initsetup_align) \ 1053 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 1054 INIT_DATA \ 1055 INIT_SETUP(initsetup_align) \ 1056 INIT_CALLS \ 1057 CON_INITCALL \ 1058 INIT_RAM_FS \ 1059 } 1060 1061 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 1062 . = ALIGN(sbss_align); \ 1063 __bss_start = .; \ 1064 SBSS(sbss_align) \ 1065 BSS(bss_align) \ 1066 . = ALIGN(stop_align); \ 1067 __bss_stop = .; 1068