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_SECTION(PAGE_SIZE) 27 * RW_DATA_SECTION(...) 28 * _edata = .; 29 * 30 * EXCEPTION_TABLE(...) 31 * NOTES 32 * 33 * BSS_SECTION(0, 0, 0) 34 * _end = .; 35 * 36 * STABS_DEBUG 37 * DWARF_DEBUG 38 * 39 * DISCARDS // must be the last 40 * } 41 * 42 * [__init_begin, __init_end] is the init section that may be freed after init 43 * // __init_begin and __init_end should be page aligned, so that we can 44 * // free the whole .init memory 45 * [_stext, _etext] is the text section 46 * [_sdata, _edata] is the data section 47 * 48 * Some of the included output section have their own set of constants. 49 * Examples are: [__initramfs_start, __initramfs_end] for initramfs and 50 * [__nosave_begin, __nosave_end] for the nosave data 51 */ 52 53 #ifndef LOAD_OFFSET 54 #define LOAD_OFFSET 0 55 #endif 56 57 #include <linux/export.h> 58 59 /* Align . to a 8 byte boundary equals to maximum function alignment. */ 60 #define ALIGN_FUNCTION() . = ALIGN(8) 61 62 /* 63 * LD_DEAD_CODE_DATA_ELIMINATION option enables -fdata-sections, which 64 * generates .data.identifier sections, which need to be pulled in with 65 * .data. We don't want to pull in .data..other sections, which Linux 66 * has defined. Same for text and bss. 67 * 68 * RODATA_MAIN is not used because existing code already defines .rodata.x 69 * sections to be brought in with rodata. 70 */ 71 #ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 72 #define TEXT_MAIN .text .text.[0-9a-zA-Z_]* 73 #define DATA_MAIN .data .data.[0-9a-zA-Z_]* 74 #define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]* 75 #define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]* 76 #define BSS_MAIN .bss .bss.[0-9a-zA-Z_]* 77 #define SBSS_MAIN .sbss .sbss.[0-9a-zA-Z_]* 78 #else 79 #define TEXT_MAIN .text 80 #define DATA_MAIN .data 81 #define SDATA_MAIN .sdata 82 #define RODATA_MAIN .rodata 83 #define BSS_MAIN .bss 84 #define SBSS_MAIN .sbss 85 #endif 86 87 /* 88 * Align to a 32 byte boundary equal to the 89 * alignment gcc 4.5 uses for a struct 90 */ 91 #define STRUCT_ALIGNMENT 32 92 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT) 93 94 /* The actual configuration determine if the init/exit sections 95 * are handled as text/data or they can be discarded (which 96 * often happens at runtime) 97 */ 98 #ifdef CONFIG_HOTPLUG_CPU 99 #define CPU_KEEP(sec) *(.cpu##sec) 100 #define CPU_DISCARD(sec) 101 #else 102 #define CPU_KEEP(sec) 103 #define CPU_DISCARD(sec) *(.cpu##sec) 104 #endif 105 106 #if defined(CONFIG_MEMORY_HOTPLUG) 107 #define MEM_KEEP(sec) *(.mem##sec) 108 #define MEM_DISCARD(sec) 109 #else 110 #define MEM_KEEP(sec) 111 #define MEM_DISCARD(sec) *(.mem##sec) 112 #endif 113 114 #ifdef CONFIG_FTRACE_MCOUNT_RECORD 115 #define MCOUNT_REC() . = ALIGN(8); \ 116 __start_mcount_loc = .; \ 117 KEEP(*(__mcount_loc)) \ 118 __stop_mcount_loc = .; 119 #else 120 #define MCOUNT_REC() 121 #endif 122 123 #ifdef CONFIG_TRACE_BRANCH_PROFILING 124 #define LIKELY_PROFILE() __start_annotated_branch_profile = .; \ 125 KEEP(*(_ftrace_annotated_branch)) \ 126 __stop_annotated_branch_profile = .; 127 #else 128 #define LIKELY_PROFILE() 129 #endif 130 131 #ifdef CONFIG_PROFILE_ALL_BRANCHES 132 #define BRANCH_PROFILE() __start_branch_profile = .; \ 133 KEEP(*(_ftrace_branch)) \ 134 __stop_branch_profile = .; 135 #else 136 #define BRANCH_PROFILE() 137 #endif 138 139 #ifdef CONFIG_KPROBES 140 #define KPROBE_BLACKLIST() . = ALIGN(8); \ 141 __start_kprobe_blacklist = .; \ 142 KEEP(*(_kprobe_blacklist)) \ 143 __stop_kprobe_blacklist = .; 144 #else 145 #define KPROBE_BLACKLIST() 146 #endif 147 148 #ifdef CONFIG_FUNCTION_ERROR_INJECTION 149 #define ERROR_INJECT_WHITELIST() STRUCT_ALIGN(); \ 150 __start_error_injection_whitelist = .; \ 151 KEEP(*(_error_injection_whitelist)) \ 152 __stop_error_injection_whitelist = .; 153 #else 154 #define ERROR_INJECT_WHITELIST() 155 #endif 156 157 #ifdef CONFIG_EVENT_TRACING 158 #define FTRACE_EVENTS() . = ALIGN(8); \ 159 __start_ftrace_events = .; \ 160 KEEP(*(_ftrace_events)) \ 161 __stop_ftrace_events = .; \ 162 __start_ftrace_eval_maps = .; \ 163 KEEP(*(_ftrace_eval_map)) \ 164 __stop_ftrace_eval_maps = .; 165 #else 166 #define FTRACE_EVENTS() 167 #endif 168 169 #ifdef CONFIG_TRACING 170 #define TRACE_PRINTKS() __start___trace_bprintk_fmt = .; \ 171 KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \ 172 __stop___trace_bprintk_fmt = .; 173 #define TRACEPOINT_STR() __start___tracepoint_str = .; \ 174 KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \ 175 __stop___tracepoint_str = .; 176 #else 177 #define TRACE_PRINTKS() 178 #define TRACEPOINT_STR() 179 #endif 180 181 #ifdef CONFIG_FTRACE_SYSCALLS 182 #define TRACE_SYSCALLS() . = ALIGN(8); \ 183 __start_syscalls_metadata = .; \ 184 KEEP(*(__syscalls_metadata)) \ 185 __stop_syscalls_metadata = .; 186 #else 187 #define TRACE_SYSCALLS() 188 #endif 189 190 #ifdef CONFIG_BPF_EVENTS 191 #define BPF_RAW_TP() STRUCT_ALIGN(); \ 192 __start__bpf_raw_tp = .; \ 193 KEEP(*(__bpf_raw_tp_map)) \ 194 __stop__bpf_raw_tp = .; 195 #else 196 #define BPF_RAW_TP() 197 #endif 198 199 #ifdef CONFIG_SERIAL_EARLYCON 200 #define EARLYCON_TABLE() . = ALIGN(8); \ 201 __earlycon_table = .; \ 202 KEEP(*(__earlycon_table)) \ 203 __earlycon_table_end = .; 204 #else 205 #define EARLYCON_TABLE() 206 #endif 207 208 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name) 209 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name) 210 #define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name) 211 #define _OF_TABLE_0(name) 212 #define _OF_TABLE_1(name) \ 213 . = ALIGN(8); \ 214 __##name##_of_table = .; \ 215 KEEP(*(__##name##_of_table)) \ 216 KEEP(*(__##name##_of_table_end)) 217 218 #define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer) 219 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip) 220 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk) 221 #define IOMMU_OF_TABLES() OF_TABLE(CONFIG_OF_IOMMU, iommu) 222 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem) 223 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method) 224 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method) 225 226 #ifdef CONFIG_ACPI 227 #define ACPI_PROBE_TABLE(name) \ 228 . = ALIGN(8); \ 229 __##name##_acpi_probe_table = .; \ 230 KEEP(*(__##name##_acpi_probe_table)) \ 231 __##name##_acpi_probe_table_end = .; 232 #else 233 #define ACPI_PROBE_TABLE(name) 234 #endif 235 236 #define KERNEL_DTB() \ 237 STRUCT_ALIGN(); \ 238 __dtb_start = .; \ 239 KEEP(*(.dtb.init.rodata)) \ 240 __dtb_end = .; 241 242 /* 243 * .data section 244 */ 245 #define DATA_DATA \ 246 *(.xiptext) \ 247 *(DATA_MAIN) \ 248 *(.ref.data) \ 249 *(.data..shared_aligned) /* percpu related */ \ 250 MEM_KEEP(init.data*) \ 251 MEM_KEEP(exit.data*) \ 252 *(.data.unlikely) \ 253 __start_once = .; \ 254 *(.data.once) \ 255 __end_once = .; \ 256 STRUCT_ALIGN(); \ 257 *(__tracepoints) \ 258 /* implement dynamic printk debug */ \ 259 . = ALIGN(8); \ 260 __start___jump_table = .; \ 261 KEEP(*(__jump_table)) \ 262 __stop___jump_table = .; \ 263 . = ALIGN(8); \ 264 __start___verbose = .; \ 265 KEEP(*(__verbose)) \ 266 __stop___verbose = .; \ 267 LIKELY_PROFILE() \ 268 BRANCH_PROFILE() \ 269 TRACE_PRINTKS() \ 270 BPF_RAW_TP() \ 271 TRACEPOINT_STR() 272 273 /* 274 * Data section helpers 275 */ 276 #define NOSAVE_DATA \ 277 . = ALIGN(PAGE_SIZE); \ 278 __nosave_begin = .; \ 279 *(.data..nosave) \ 280 . = ALIGN(PAGE_SIZE); \ 281 __nosave_end = .; 282 283 #define PAGE_ALIGNED_DATA(page_align) \ 284 . = ALIGN(page_align); \ 285 *(.data..page_aligned) 286 287 #define READ_MOSTLY_DATA(align) \ 288 . = ALIGN(align); \ 289 *(.data..read_mostly) \ 290 . = ALIGN(align); 291 292 #define CACHELINE_ALIGNED_DATA(align) \ 293 . = ALIGN(align); \ 294 *(.data..cacheline_aligned) 295 296 #define INIT_TASK_DATA(align) \ 297 . = ALIGN(align); \ 298 __start_init_task = .; \ 299 init_thread_union = .; \ 300 init_stack = .; \ 301 KEEP(*(.data..init_task)) \ 302 KEEP(*(.data..init_thread_info)) \ 303 . = __start_init_task + THREAD_SIZE; \ 304 __end_init_task = .; 305 306 /* 307 * Allow architectures to handle ro_after_init data on their 308 * own by defining an empty RO_AFTER_INIT_DATA. 309 */ 310 #ifndef RO_AFTER_INIT_DATA 311 #define RO_AFTER_INIT_DATA \ 312 __start_ro_after_init = .; \ 313 *(.data..ro_after_init) \ 314 __end_ro_after_init = .; 315 #endif 316 317 /* 318 * Read only Data 319 */ 320 #define RO_DATA_SECTION(align) \ 321 . = ALIGN((align)); \ 322 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 323 __start_rodata = .; \ 324 *(.rodata) *(.rodata.*) \ 325 RO_AFTER_INIT_DATA /* Read only after init */ \ 326 KEEP(*(__vermagic)) /* Kernel version magic */ \ 327 . = ALIGN(8); \ 328 __start___tracepoints_ptrs = .; \ 329 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \ 330 __stop___tracepoints_ptrs = .; \ 331 *(__tracepoints_strings)/* Tracepoints: strings */ \ 332 } \ 333 \ 334 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 335 *(.rodata1) \ 336 } \ 337 \ 338 /* PCI quirks */ \ 339 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 340 __start_pci_fixups_early = .; \ 341 KEEP(*(.pci_fixup_early)) \ 342 __end_pci_fixups_early = .; \ 343 __start_pci_fixups_header = .; \ 344 KEEP(*(.pci_fixup_header)) \ 345 __end_pci_fixups_header = .; \ 346 __start_pci_fixups_final = .; \ 347 KEEP(*(.pci_fixup_final)) \ 348 __end_pci_fixups_final = .; \ 349 __start_pci_fixups_enable = .; \ 350 KEEP(*(.pci_fixup_enable)) \ 351 __end_pci_fixups_enable = .; \ 352 __start_pci_fixups_resume = .; \ 353 KEEP(*(.pci_fixup_resume)) \ 354 __end_pci_fixups_resume = .; \ 355 __start_pci_fixups_resume_early = .; \ 356 KEEP(*(.pci_fixup_resume_early)) \ 357 __end_pci_fixups_resume_early = .; \ 358 __start_pci_fixups_suspend = .; \ 359 KEEP(*(.pci_fixup_suspend)) \ 360 __end_pci_fixups_suspend = .; \ 361 __start_pci_fixups_suspend_late = .; \ 362 KEEP(*(.pci_fixup_suspend_late)) \ 363 __end_pci_fixups_suspend_late = .; \ 364 } \ 365 \ 366 /* Built-in firmware blobs */ \ 367 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \ 368 __start_builtin_fw = .; \ 369 KEEP(*(.builtin_fw)) \ 370 __end_builtin_fw = .; \ 371 } \ 372 \ 373 TRACEDATA \ 374 \ 375 /* Kernel symbol table: Normal symbols */ \ 376 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 377 __start___ksymtab = .; \ 378 KEEP(*(SORT(___ksymtab+*))) \ 379 __stop___ksymtab = .; \ 380 } \ 381 \ 382 /* Kernel symbol table: GPL-only symbols */ \ 383 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 384 __start___ksymtab_gpl = .; \ 385 KEEP(*(SORT(___ksymtab_gpl+*))) \ 386 __stop___ksymtab_gpl = .; \ 387 } \ 388 \ 389 /* Kernel symbol table: Normal unused symbols */ \ 390 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \ 391 __start___ksymtab_unused = .; \ 392 KEEP(*(SORT(___ksymtab_unused+*))) \ 393 __stop___ksymtab_unused = .; \ 394 } \ 395 \ 396 /* Kernel symbol table: GPL-only unused symbols */ \ 397 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \ 398 __start___ksymtab_unused_gpl = .; \ 399 KEEP(*(SORT(___ksymtab_unused_gpl+*))) \ 400 __stop___ksymtab_unused_gpl = .; \ 401 } \ 402 \ 403 /* Kernel symbol table: GPL-future-only symbols */ \ 404 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \ 405 __start___ksymtab_gpl_future = .; \ 406 KEEP(*(SORT(___ksymtab_gpl_future+*))) \ 407 __stop___ksymtab_gpl_future = .; \ 408 } \ 409 \ 410 /* Kernel symbol table: Normal symbols */ \ 411 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 412 __start___kcrctab = .; \ 413 KEEP(*(SORT(___kcrctab+*))) \ 414 __stop___kcrctab = .; \ 415 } \ 416 \ 417 /* Kernel symbol table: GPL-only symbols */ \ 418 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 419 __start___kcrctab_gpl = .; \ 420 KEEP(*(SORT(___kcrctab_gpl+*))) \ 421 __stop___kcrctab_gpl = .; \ 422 } \ 423 \ 424 /* Kernel symbol table: Normal unused symbols */ \ 425 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \ 426 __start___kcrctab_unused = .; \ 427 KEEP(*(SORT(___kcrctab_unused+*))) \ 428 __stop___kcrctab_unused = .; \ 429 } \ 430 \ 431 /* Kernel symbol table: GPL-only unused symbols */ \ 432 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \ 433 __start___kcrctab_unused_gpl = .; \ 434 KEEP(*(SORT(___kcrctab_unused_gpl+*))) \ 435 __stop___kcrctab_unused_gpl = .; \ 436 } \ 437 \ 438 /* Kernel symbol table: GPL-future-only symbols */ \ 439 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \ 440 __start___kcrctab_gpl_future = .; \ 441 KEEP(*(SORT(___kcrctab_gpl_future+*))) \ 442 __stop___kcrctab_gpl_future = .; \ 443 } \ 444 \ 445 /* Kernel symbol table: strings */ \ 446 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 447 *(__ksymtab_strings) \ 448 } \ 449 \ 450 /* __*init sections */ \ 451 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 452 *(.ref.rodata) \ 453 MEM_KEEP(init.rodata) \ 454 MEM_KEEP(exit.rodata) \ 455 } \ 456 \ 457 /* Built-in module parameters. */ \ 458 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 459 __start___param = .; \ 460 KEEP(*(__param)) \ 461 __stop___param = .; \ 462 } \ 463 \ 464 /* Built-in module versions. */ \ 465 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 466 __start___modver = .; \ 467 KEEP(*(__modver)) \ 468 __stop___modver = .; \ 469 . = ALIGN((align)); \ 470 __end_rodata = .; \ 471 } \ 472 . = ALIGN((align)); 473 474 /* RODATA & RO_DATA provided for backward compatibility. 475 * All archs are supposed to use RO_DATA() */ 476 #define RODATA RO_DATA_SECTION(4096) 477 #define RO_DATA(align) RO_DATA_SECTION(align) 478 479 #define SECURITY_INIT \ 480 .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \ 481 __security_initcall_start = .; \ 482 KEEP(*(.security_initcall.init)) \ 483 __security_initcall_end = .; \ 484 } 485 486 /* 487 * .text section. Map to function alignment to avoid address changes 488 * during second ld run in second ld pass when generating System.map 489 * 490 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead 491 * code elimination is enabled, so these sections should be converted 492 * to use ".." first. 493 */ 494 #define TEXT_TEXT \ 495 ALIGN_FUNCTION(); \ 496 *(.text.hot TEXT_MAIN .text.fixup .text.unlikely) \ 497 *(.text..refcount) \ 498 *(.ref.text) \ 499 MEM_KEEP(init.text*) \ 500 MEM_KEEP(exit.text*) \ 501 502 503 /* sched.text is aling to function alignment to secure we have same 504 * address even at second ld pass when generating System.map */ 505 #define SCHED_TEXT \ 506 ALIGN_FUNCTION(); \ 507 __sched_text_start = .; \ 508 *(.sched.text) \ 509 __sched_text_end = .; 510 511 /* spinlock.text is aling to function alignment to secure we have same 512 * address even at second ld pass when generating System.map */ 513 #define LOCK_TEXT \ 514 ALIGN_FUNCTION(); \ 515 __lock_text_start = .; \ 516 *(.spinlock.text) \ 517 __lock_text_end = .; 518 519 #define CPUIDLE_TEXT \ 520 ALIGN_FUNCTION(); \ 521 __cpuidle_text_start = .; \ 522 *(.cpuidle.text) \ 523 __cpuidle_text_end = .; 524 525 #define KPROBES_TEXT \ 526 ALIGN_FUNCTION(); \ 527 __kprobes_text_start = .; \ 528 *(.kprobes.text) \ 529 __kprobes_text_end = .; 530 531 #define ENTRY_TEXT \ 532 ALIGN_FUNCTION(); \ 533 __entry_text_start = .; \ 534 *(.entry.text) \ 535 __entry_text_end = .; 536 537 #define IRQENTRY_TEXT \ 538 ALIGN_FUNCTION(); \ 539 __irqentry_text_start = .; \ 540 *(.irqentry.text) \ 541 __irqentry_text_end = .; 542 543 #define SOFTIRQENTRY_TEXT \ 544 ALIGN_FUNCTION(); \ 545 __softirqentry_text_start = .; \ 546 *(.softirqentry.text) \ 547 __softirqentry_text_end = .; 548 549 /* Section used for early init (in .S files) */ 550 #define HEAD_TEXT KEEP(*(.head.text)) 551 552 #define HEAD_TEXT_SECTION \ 553 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 554 HEAD_TEXT \ 555 } 556 557 /* 558 * Exception table 559 */ 560 #define EXCEPTION_TABLE(align) \ 561 . = ALIGN(align); \ 562 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 563 __start___ex_table = .; \ 564 KEEP(*(__ex_table)) \ 565 __stop___ex_table = .; \ 566 } 567 568 /* 569 * Init task 570 */ 571 #define INIT_TASK_DATA_SECTION(align) \ 572 . = ALIGN(align); \ 573 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 574 INIT_TASK_DATA(align) \ 575 } 576 577 #ifdef CONFIG_CONSTRUCTORS 578 #define KERNEL_CTORS() . = ALIGN(8); \ 579 __ctors_start = .; \ 580 KEEP(*(.ctors)) \ 581 KEEP(*(SORT(.init_array.*))) \ 582 KEEP(*(.init_array)) \ 583 __ctors_end = .; 584 #else 585 #define KERNEL_CTORS() 586 #endif 587 588 /* init and exit section handling */ 589 #define INIT_DATA \ 590 KEEP(*(SORT(___kentry+*))) \ 591 *(.init.data init.data.*) \ 592 MEM_DISCARD(init.data*) \ 593 KERNEL_CTORS() \ 594 MCOUNT_REC() \ 595 *(.init.rodata .init.rodata.*) \ 596 FTRACE_EVENTS() \ 597 TRACE_SYSCALLS() \ 598 KPROBE_BLACKLIST() \ 599 ERROR_INJECT_WHITELIST() \ 600 MEM_DISCARD(init.rodata) \ 601 CLK_OF_TABLES() \ 602 RESERVEDMEM_OF_TABLES() \ 603 TIMER_OF_TABLES() \ 604 IOMMU_OF_TABLES() \ 605 CPU_METHOD_OF_TABLES() \ 606 CPUIDLE_METHOD_OF_TABLES() \ 607 KERNEL_DTB() \ 608 IRQCHIP_OF_MATCH_TABLE() \ 609 ACPI_PROBE_TABLE(irqchip) \ 610 ACPI_PROBE_TABLE(timer) \ 611 EARLYCON_TABLE() 612 613 #define INIT_TEXT \ 614 *(.init.text .init.text.*) \ 615 *(.text.startup) \ 616 MEM_DISCARD(init.text*) 617 618 #define EXIT_DATA \ 619 *(.exit.data .exit.data.*) \ 620 *(.fini_array) \ 621 *(.dtors) \ 622 MEM_DISCARD(exit.data*) \ 623 MEM_DISCARD(exit.rodata*) 624 625 #define EXIT_TEXT \ 626 *(.exit.text) \ 627 *(.text.exit) \ 628 MEM_DISCARD(exit.text) 629 630 #define EXIT_CALL \ 631 *(.exitcall.exit) 632 633 /* 634 * bss (Block Started by Symbol) - uninitialized data 635 * zeroed during startup 636 */ 637 #define SBSS(sbss_align) \ 638 . = ALIGN(sbss_align); \ 639 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 640 *(.dynsbss) \ 641 *(SBSS_MAIN) \ 642 *(.scommon) \ 643 } 644 645 /* 646 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 647 * sections to the front of bss. 648 */ 649 #ifndef BSS_FIRST_SECTIONS 650 #define BSS_FIRST_SECTIONS 651 #endif 652 653 #define BSS(bss_align) \ 654 . = ALIGN(bss_align); \ 655 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 656 BSS_FIRST_SECTIONS \ 657 *(.bss..page_aligned) \ 658 *(.dynbss) \ 659 *(BSS_MAIN) \ 660 *(COMMON) \ 661 } 662 663 /* 664 * DWARF debug sections. 665 * Symbols in the DWARF debugging sections are relative to 666 * the beginning of the section so we begin them at 0. 667 */ 668 #define DWARF_DEBUG \ 669 /* DWARF 1 */ \ 670 .debug 0 : { *(.debug) } \ 671 .line 0 : { *(.line) } \ 672 /* GNU DWARF 1 extensions */ \ 673 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 674 .debug_sfnames 0 : { *(.debug_sfnames) } \ 675 /* DWARF 1.1 and DWARF 2 */ \ 676 .debug_aranges 0 : { *(.debug_aranges) } \ 677 .debug_pubnames 0 : { *(.debug_pubnames) } \ 678 /* DWARF 2 */ \ 679 .debug_info 0 : { *(.debug_info \ 680 .gnu.linkonce.wi.*) } \ 681 .debug_abbrev 0 : { *(.debug_abbrev) } \ 682 .debug_line 0 : { *(.debug_line) } \ 683 .debug_frame 0 : { *(.debug_frame) } \ 684 .debug_str 0 : { *(.debug_str) } \ 685 .debug_loc 0 : { *(.debug_loc) } \ 686 .debug_macinfo 0 : { *(.debug_macinfo) } \ 687 .debug_pubtypes 0 : { *(.debug_pubtypes) } \ 688 /* DWARF 3 */ \ 689 .debug_ranges 0 : { *(.debug_ranges) } \ 690 /* SGI/MIPS DWARF 2 extensions */ \ 691 .debug_weaknames 0 : { *(.debug_weaknames) } \ 692 .debug_funcnames 0 : { *(.debug_funcnames) } \ 693 .debug_typenames 0 : { *(.debug_typenames) } \ 694 .debug_varnames 0 : { *(.debug_varnames) } \ 695 /* GNU DWARF 2 extensions */ \ 696 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \ 697 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \ 698 /* DWARF 4 */ \ 699 .debug_types 0 : { *(.debug_types) } \ 700 /* DWARF 5 */ \ 701 .debug_macro 0 : { *(.debug_macro) } \ 702 .debug_addr 0 : { *(.debug_addr) } 703 704 /* Stabs debugging sections. */ 705 #define STABS_DEBUG \ 706 .stab 0 : { *(.stab) } \ 707 .stabstr 0 : { *(.stabstr) } \ 708 .stab.excl 0 : { *(.stab.excl) } \ 709 .stab.exclstr 0 : { *(.stab.exclstr) } \ 710 .stab.index 0 : { *(.stab.index) } \ 711 .stab.indexstr 0 : { *(.stab.indexstr) } \ 712 .comment 0 : { *(.comment) } 713 714 #ifdef CONFIG_GENERIC_BUG 715 #define BUG_TABLE \ 716 . = ALIGN(8); \ 717 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 718 __start___bug_table = .; \ 719 KEEP(*(__bug_table)) \ 720 __stop___bug_table = .; \ 721 } 722 #else 723 #define BUG_TABLE 724 #endif 725 726 #ifdef CONFIG_UNWINDER_ORC 727 #define ORC_UNWIND_TABLE \ 728 . = ALIGN(4); \ 729 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \ 730 __start_orc_unwind_ip = .; \ 731 KEEP(*(.orc_unwind_ip)) \ 732 __stop_orc_unwind_ip = .; \ 733 } \ 734 . = ALIGN(6); \ 735 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \ 736 __start_orc_unwind = .; \ 737 KEEP(*(.orc_unwind)) \ 738 __stop_orc_unwind = .; \ 739 } \ 740 . = ALIGN(4); \ 741 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \ 742 orc_lookup = .; \ 743 . += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) / \ 744 LOOKUP_BLOCK_SIZE) + 1) * 4; \ 745 orc_lookup_end = .; \ 746 } 747 #else 748 #define ORC_UNWIND_TABLE 749 #endif 750 751 #ifdef CONFIG_PM_TRACE 752 #define TRACEDATA \ 753 . = ALIGN(4); \ 754 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 755 __tracedata_start = .; \ 756 KEEP(*(.tracedata)) \ 757 __tracedata_end = .; \ 758 } 759 #else 760 #define TRACEDATA 761 #endif 762 763 #define NOTES \ 764 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 765 __start_notes = .; \ 766 KEEP(*(.note.*)) \ 767 __stop_notes = .; \ 768 } 769 770 #define INIT_SETUP(initsetup_align) \ 771 . = ALIGN(initsetup_align); \ 772 __setup_start = .; \ 773 KEEP(*(.init.setup)) \ 774 __setup_end = .; 775 776 #define INIT_CALLS_LEVEL(level) \ 777 __initcall##level##_start = .; \ 778 KEEP(*(.initcall##level##.init)) \ 779 KEEP(*(.initcall##level##s.init)) \ 780 781 #define INIT_CALLS \ 782 __initcall_start = .; \ 783 KEEP(*(.initcallearly.init)) \ 784 INIT_CALLS_LEVEL(0) \ 785 INIT_CALLS_LEVEL(1) \ 786 INIT_CALLS_LEVEL(2) \ 787 INIT_CALLS_LEVEL(3) \ 788 INIT_CALLS_LEVEL(4) \ 789 INIT_CALLS_LEVEL(5) \ 790 INIT_CALLS_LEVEL(rootfs) \ 791 INIT_CALLS_LEVEL(6) \ 792 INIT_CALLS_LEVEL(7) \ 793 __initcall_end = .; 794 795 #define CON_INITCALL \ 796 __con_initcall_start = .; \ 797 KEEP(*(.con_initcall.init)) \ 798 __con_initcall_end = .; 799 800 #define SECURITY_INITCALL \ 801 __security_initcall_start = .; \ 802 KEEP(*(.security_initcall.init)) \ 803 __security_initcall_end = .; 804 805 #ifdef CONFIG_BLK_DEV_INITRD 806 #define INIT_RAM_FS \ 807 . = ALIGN(4); \ 808 __initramfs_start = .; \ 809 KEEP(*(.init.ramfs)) \ 810 . = ALIGN(8); \ 811 KEEP(*(.init.ramfs.info)) 812 #else 813 #define INIT_RAM_FS 814 #endif 815 816 /* 817 * Memory encryption operates on a page basis. Since we need to clear 818 * the memory encryption mask for this section, it needs to be aligned 819 * on a page boundary and be a page-size multiple in length. 820 * 821 * Note: We use a separate section so that only this section gets 822 * decrypted to avoid exposing more than we wish. 823 */ 824 #ifdef CONFIG_AMD_MEM_ENCRYPT 825 #define PERCPU_DECRYPTED_SECTION \ 826 . = ALIGN(PAGE_SIZE); \ 827 *(.data..percpu..decrypted) \ 828 . = ALIGN(PAGE_SIZE); 829 #else 830 #define PERCPU_DECRYPTED_SECTION 831 #endif 832 833 834 /* 835 * Default discarded sections. 836 * 837 * Some archs want to discard exit text/data at runtime rather than 838 * link time due to cross-section references such as alt instructions, 839 * bug table, eh_frame, etc. DISCARDS must be the last of output 840 * section definitions so that such archs put those in earlier section 841 * definitions. 842 */ 843 #define DISCARDS \ 844 /DISCARD/ : { \ 845 EXIT_TEXT \ 846 EXIT_DATA \ 847 EXIT_CALL \ 848 *(.discard) \ 849 *(.discard.*) \ 850 } 851 852 /** 853 * PERCPU_INPUT - the percpu input sections 854 * @cacheline: cacheline size 855 * 856 * The core percpu section names and core symbols which do not rely 857 * directly upon load addresses. 858 * 859 * @cacheline is used to align subsections to avoid false cacheline 860 * sharing between subsections for different purposes. 861 */ 862 #define PERCPU_INPUT(cacheline) \ 863 __per_cpu_start = .; \ 864 *(.data..percpu..first) \ 865 . = ALIGN(PAGE_SIZE); \ 866 *(.data..percpu..page_aligned) \ 867 . = ALIGN(cacheline); \ 868 *(.data..percpu..read_mostly) \ 869 . = ALIGN(cacheline); \ 870 *(.data..percpu) \ 871 *(.data..percpu..shared_aligned) \ 872 PERCPU_DECRYPTED_SECTION \ 873 __per_cpu_end = .; 874 875 /** 876 * PERCPU_VADDR - define output section for percpu area 877 * @cacheline: cacheline size 878 * @vaddr: explicit base address (optional) 879 * @phdr: destination PHDR (optional) 880 * 881 * Macro which expands to output section for percpu area. 882 * 883 * @cacheline is used to align subsections to avoid false cacheline 884 * sharing between subsections for different purposes. 885 * 886 * If @vaddr is not blank, it specifies explicit base address and all 887 * percpu symbols will be offset from the given address. If blank, 888 * @vaddr always equals @laddr + LOAD_OFFSET. 889 * 890 * @phdr defines the output PHDR to use if not blank. Be warned that 891 * output PHDR is sticky. If @phdr is specified, the next output 892 * section in the linker script will go there too. @phdr should have 893 * a leading colon. 894 * 895 * Note that this macros defines __per_cpu_load as an absolute symbol. 896 * If there is no need to put the percpu section at a predetermined 897 * address, use PERCPU_SECTION. 898 */ 899 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 900 __per_cpu_load = .; \ 901 .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \ 902 PERCPU_INPUT(cacheline) \ 903 } phdr \ 904 . = __per_cpu_load + SIZEOF(.data..percpu); 905 906 /** 907 * PERCPU_SECTION - define output section for percpu area, simple version 908 * @cacheline: cacheline size 909 * 910 * Align to PAGE_SIZE and outputs output section for percpu area. This 911 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 912 * __per_cpu_start will be identical. 913 * 914 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 915 * except that __per_cpu_load is defined as a relative symbol against 916 * .data..percpu which is required for relocatable x86_32 configuration. 917 */ 918 #define PERCPU_SECTION(cacheline) \ 919 . = ALIGN(PAGE_SIZE); \ 920 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 921 __per_cpu_load = .; \ 922 PERCPU_INPUT(cacheline) \ 923 } 924 925 926 /* 927 * Definition of the high level *_SECTION macros 928 * They will fit only a subset of the architectures 929 */ 930 931 932 /* 933 * Writeable data. 934 * All sections are combined in a single .data section. 935 * The sections following CONSTRUCTORS are arranged so their 936 * typical alignment matches. 937 * A cacheline is typical/always less than a PAGE_SIZE so 938 * the sections that has this restriction (or similar) 939 * is located before the ones requiring PAGE_SIZE alignment. 940 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 941 * matches the requirement of PAGE_ALIGNED_DATA. 942 * 943 * use 0 as page_align if page_aligned data is not used */ 944 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \ 945 . = ALIGN(PAGE_SIZE); \ 946 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 947 INIT_TASK_DATA(inittask) \ 948 NOSAVE_DATA \ 949 PAGE_ALIGNED_DATA(pagealigned) \ 950 CACHELINE_ALIGNED_DATA(cacheline) \ 951 READ_MOSTLY_DATA(cacheline) \ 952 DATA_DATA \ 953 CONSTRUCTORS \ 954 } \ 955 BUG_TABLE \ 956 957 #define INIT_TEXT_SECTION(inittext_align) \ 958 . = ALIGN(inittext_align); \ 959 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 960 _sinittext = .; \ 961 INIT_TEXT \ 962 _einittext = .; \ 963 } 964 965 #define INIT_DATA_SECTION(initsetup_align) \ 966 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 967 INIT_DATA \ 968 INIT_SETUP(initsetup_align) \ 969 INIT_CALLS \ 970 CON_INITCALL \ 971 SECURITY_INITCALL \ 972 INIT_RAM_FS \ 973 } 974 975 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 976 . = ALIGN(sbss_align); \ 977 __bss_start = .; \ 978 SBSS(sbss_align) \ 979 BSS(bss_align) \ 980 . = ALIGN(stop_align); \ 981 __bss_stop = .; 982