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