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 . = ALIGN(8); \ 336 __start___tracepoints_ptrs = .; \ 337 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \ 338 __stop___tracepoints_ptrs = .; \ 339 *(__tracepoints_strings)/* Tracepoints: strings */ \ 340 } \ 341 \ 342 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 343 *(.rodata1) \ 344 } \ 345 \ 346 /* PCI quirks */ \ 347 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 348 __start_pci_fixups_early = .; \ 349 KEEP(*(.pci_fixup_early)) \ 350 __end_pci_fixups_early = .; \ 351 __start_pci_fixups_header = .; \ 352 KEEP(*(.pci_fixup_header)) \ 353 __end_pci_fixups_header = .; \ 354 __start_pci_fixups_final = .; \ 355 KEEP(*(.pci_fixup_final)) \ 356 __end_pci_fixups_final = .; \ 357 __start_pci_fixups_enable = .; \ 358 KEEP(*(.pci_fixup_enable)) \ 359 __end_pci_fixups_enable = .; \ 360 __start_pci_fixups_resume = .; \ 361 KEEP(*(.pci_fixup_resume)) \ 362 __end_pci_fixups_resume = .; \ 363 __start_pci_fixups_resume_early = .; \ 364 KEEP(*(.pci_fixup_resume_early)) \ 365 __end_pci_fixups_resume_early = .; \ 366 __start_pci_fixups_suspend = .; \ 367 KEEP(*(.pci_fixup_suspend)) \ 368 __end_pci_fixups_suspend = .; \ 369 __start_pci_fixups_suspend_late = .; \ 370 KEEP(*(.pci_fixup_suspend_late)) \ 371 __end_pci_fixups_suspend_late = .; \ 372 } \ 373 \ 374 /* Built-in firmware blobs */ \ 375 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \ 376 __start_builtin_fw = .; \ 377 KEEP(*(.builtin_fw)) \ 378 __end_builtin_fw = .; \ 379 } \ 380 \ 381 TRACEDATA \ 382 \ 383 /* Kernel symbol table: Normal symbols */ \ 384 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 385 __start___ksymtab = .; \ 386 KEEP(*(SORT(___ksymtab+*))) \ 387 __stop___ksymtab = .; \ 388 } \ 389 \ 390 /* Kernel symbol table: GPL-only symbols */ \ 391 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 392 __start___ksymtab_gpl = .; \ 393 KEEP(*(SORT(___ksymtab_gpl+*))) \ 394 __stop___ksymtab_gpl = .; \ 395 } \ 396 \ 397 /* Kernel symbol table: Normal unused symbols */ \ 398 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \ 399 __start___ksymtab_unused = .; \ 400 KEEP(*(SORT(___ksymtab_unused+*))) \ 401 __stop___ksymtab_unused = .; \ 402 } \ 403 \ 404 /* Kernel symbol table: GPL-only unused symbols */ \ 405 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \ 406 __start___ksymtab_unused_gpl = .; \ 407 KEEP(*(SORT(___ksymtab_unused_gpl+*))) \ 408 __stop___ksymtab_unused_gpl = .; \ 409 } \ 410 \ 411 /* Kernel symbol table: GPL-future-only symbols */ \ 412 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \ 413 __start___ksymtab_gpl_future = .; \ 414 KEEP(*(SORT(___ksymtab_gpl_future+*))) \ 415 __stop___ksymtab_gpl_future = .; \ 416 } \ 417 \ 418 /* Kernel symbol table: Normal symbols */ \ 419 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 420 __start___kcrctab = .; \ 421 KEEP(*(SORT(___kcrctab+*))) \ 422 __stop___kcrctab = .; \ 423 } \ 424 \ 425 /* Kernel symbol table: GPL-only symbols */ \ 426 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 427 __start___kcrctab_gpl = .; \ 428 KEEP(*(SORT(___kcrctab_gpl+*))) \ 429 __stop___kcrctab_gpl = .; \ 430 } \ 431 \ 432 /* Kernel symbol table: Normal unused symbols */ \ 433 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \ 434 __start___kcrctab_unused = .; \ 435 KEEP(*(SORT(___kcrctab_unused+*))) \ 436 __stop___kcrctab_unused = .; \ 437 } \ 438 \ 439 /* Kernel symbol table: GPL-only unused symbols */ \ 440 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \ 441 __start___kcrctab_unused_gpl = .; \ 442 KEEP(*(SORT(___kcrctab_unused_gpl+*))) \ 443 __stop___kcrctab_unused_gpl = .; \ 444 } \ 445 \ 446 /* Kernel symbol table: GPL-future-only symbols */ \ 447 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \ 448 __start___kcrctab_gpl_future = .; \ 449 KEEP(*(SORT(___kcrctab_gpl_future+*))) \ 450 __stop___kcrctab_gpl_future = .; \ 451 } \ 452 \ 453 /* Kernel symbol table: strings */ \ 454 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 455 *(__ksymtab_strings) \ 456 } \ 457 \ 458 /* __*init sections */ \ 459 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 460 *(.ref.rodata) \ 461 MEM_KEEP(init.rodata) \ 462 MEM_KEEP(exit.rodata) \ 463 } \ 464 \ 465 /* Built-in module parameters. */ \ 466 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 467 __start___param = .; \ 468 KEEP(*(__param)) \ 469 __stop___param = .; \ 470 } \ 471 \ 472 /* Built-in module versions. */ \ 473 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 474 __start___modver = .; \ 475 KEEP(*(__modver)) \ 476 __stop___modver = .; \ 477 . = ALIGN((align)); \ 478 __end_rodata = .; \ 479 } \ 480 . = ALIGN((align)); 481 482 /* RODATA & RO_DATA provided for backward compatibility. 483 * All archs are supposed to use RO_DATA() */ 484 #define RODATA RO_DATA_SECTION(4096) 485 #define RO_DATA(align) RO_DATA_SECTION(align) 486 487 /* 488 * .text section. Map to function alignment to avoid address changes 489 * during second ld run in second ld pass when generating System.map 490 * 491 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead 492 * code elimination is enabled, so these sections should be converted 493 * to use ".." first. 494 */ 495 #define TEXT_TEXT \ 496 ALIGN_FUNCTION(); \ 497 *(.text.hot TEXT_MAIN .text.fixup .text.unlikely) \ 498 *(.text..refcount) \ 499 *(.ref.text) \ 500 MEM_KEEP(init.text*) \ 501 MEM_KEEP(exit.text*) \ 502 503 504 /* sched.text is aling to function alignment to secure we have same 505 * address even at second ld pass when generating System.map */ 506 #define SCHED_TEXT \ 507 ALIGN_FUNCTION(); \ 508 __sched_text_start = .; \ 509 *(.sched.text) \ 510 __sched_text_end = .; 511 512 /* spinlock.text is aling to function alignment to secure we have same 513 * address even at second ld pass when generating System.map */ 514 #define LOCK_TEXT \ 515 ALIGN_FUNCTION(); \ 516 __lock_text_start = .; \ 517 *(.spinlock.text) \ 518 __lock_text_end = .; 519 520 #define CPUIDLE_TEXT \ 521 ALIGN_FUNCTION(); \ 522 __cpuidle_text_start = .; \ 523 *(.cpuidle.text) \ 524 __cpuidle_text_end = .; 525 526 #define KPROBES_TEXT \ 527 ALIGN_FUNCTION(); \ 528 __kprobes_text_start = .; \ 529 *(.kprobes.text) \ 530 __kprobes_text_end = .; 531 532 #define ENTRY_TEXT \ 533 ALIGN_FUNCTION(); \ 534 __entry_text_start = .; \ 535 *(.entry.text) \ 536 __entry_text_end = .; 537 538 #define IRQENTRY_TEXT \ 539 ALIGN_FUNCTION(); \ 540 __irqentry_text_start = .; \ 541 *(.irqentry.text) \ 542 __irqentry_text_end = .; 543 544 #define SOFTIRQENTRY_TEXT \ 545 ALIGN_FUNCTION(); \ 546 __softirqentry_text_start = .; \ 547 *(.softirqentry.text) \ 548 __softirqentry_text_end = .; 549 550 /* Section used for early init (in .S files) */ 551 #define HEAD_TEXT KEEP(*(.head.text)) 552 553 #define HEAD_TEXT_SECTION \ 554 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 555 HEAD_TEXT \ 556 } 557 558 /* 559 * Exception table 560 */ 561 #define EXCEPTION_TABLE(align) \ 562 . = ALIGN(align); \ 563 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 564 __start___ex_table = .; \ 565 KEEP(*(__ex_table)) \ 566 __stop___ex_table = .; \ 567 } 568 569 /* 570 * Init task 571 */ 572 #define INIT_TASK_DATA_SECTION(align) \ 573 . = ALIGN(align); \ 574 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 575 INIT_TASK_DATA(align) \ 576 } 577 578 #ifdef CONFIG_CONSTRUCTORS 579 #define KERNEL_CTORS() . = ALIGN(8); \ 580 __ctors_start = .; \ 581 KEEP(*(.ctors)) \ 582 KEEP(*(SORT(.init_array.*))) \ 583 KEEP(*(.init_array)) \ 584 __ctors_end = .; 585 #else 586 #define KERNEL_CTORS() 587 #endif 588 589 /* init and exit section handling */ 590 #define INIT_DATA \ 591 KEEP(*(SORT(___kentry+*))) \ 592 *(.init.data init.data.*) \ 593 MEM_DISCARD(init.data*) \ 594 KERNEL_CTORS() \ 595 MCOUNT_REC() \ 596 *(.init.rodata .init.rodata.*) \ 597 FTRACE_EVENTS() \ 598 TRACE_SYSCALLS() \ 599 KPROBE_BLACKLIST() \ 600 ERROR_INJECT_WHITELIST() \ 601 MEM_DISCARD(init.rodata) \ 602 CLK_OF_TABLES() \ 603 RESERVEDMEM_OF_TABLES() \ 604 TIMER_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 LSM_TABLE() 613 614 #define INIT_TEXT \ 615 *(.init.text .init.text.*) \ 616 *(.text.startup) \ 617 MEM_DISCARD(init.text*) 618 619 #define EXIT_DATA \ 620 *(.exit.data .exit.data.*) \ 621 *(.fini_array .fini_array.*) \ 622 *(.dtors .dtors.*) \ 623 MEM_DISCARD(exit.data*) \ 624 MEM_DISCARD(exit.rodata*) 625 626 #define EXIT_TEXT \ 627 *(.exit.text) \ 628 *(.text.exit) \ 629 MEM_DISCARD(exit.text) 630 631 #define EXIT_CALL \ 632 *(.exitcall.exit) 633 634 /* 635 * bss (Block Started by Symbol) - uninitialized data 636 * zeroed during startup 637 */ 638 #define SBSS(sbss_align) \ 639 . = ALIGN(sbss_align); \ 640 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 641 *(.dynsbss) \ 642 *(SBSS_MAIN) \ 643 *(.scommon) \ 644 } 645 646 /* 647 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 648 * sections to the front of bss. 649 */ 650 #ifndef BSS_FIRST_SECTIONS 651 #define BSS_FIRST_SECTIONS 652 #endif 653 654 #define BSS(bss_align) \ 655 . = ALIGN(bss_align); \ 656 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 657 BSS_FIRST_SECTIONS \ 658 *(.bss..page_aligned) \ 659 *(.dynbss) \ 660 *(BSS_MAIN) \ 661 *(COMMON) \ 662 } 663 664 /* 665 * DWARF debug sections. 666 * Symbols in the DWARF debugging sections are relative to 667 * the beginning of the section so we begin them at 0. 668 */ 669 #define DWARF_DEBUG \ 670 /* DWARF 1 */ \ 671 .debug 0 : { *(.debug) } \ 672 .line 0 : { *(.line) } \ 673 /* GNU DWARF 1 extensions */ \ 674 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 675 .debug_sfnames 0 : { *(.debug_sfnames) } \ 676 /* DWARF 1.1 and DWARF 2 */ \ 677 .debug_aranges 0 : { *(.debug_aranges) } \ 678 .debug_pubnames 0 : { *(.debug_pubnames) } \ 679 /* DWARF 2 */ \ 680 .debug_info 0 : { *(.debug_info \ 681 .gnu.linkonce.wi.*) } \ 682 .debug_abbrev 0 : { *(.debug_abbrev) } \ 683 .debug_line 0 : { *(.debug_line) } \ 684 .debug_frame 0 : { *(.debug_frame) } \ 685 .debug_str 0 : { *(.debug_str) } \ 686 .debug_loc 0 : { *(.debug_loc) } \ 687 .debug_macinfo 0 : { *(.debug_macinfo) } \ 688 .debug_pubtypes 0 : { *(.debug_pubtypes) } \ 689 /* DWARF 3 */ \ 690 .debug_ranges 0 : { *(.debug_ranges) } \ 691 /* SGI/MIPS DWARF 2 extensions */ \ 692 .debug_weaknames 0 : { *(.debug_weaknames) } \ 693 .debug_funcnames 0 : { *(.debug_funcnames) } \ 694 .debug_typenames 0 : { *(.debug_typenames) } \ 695 .debug_varnames 0 : { *(.debug_varnames) } \ 696 /* GNU DWARF 2 extensions */ \ 697 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \ 698 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \ 699 /* DWARF 4 */ \ 700 .debug_types 0 : { *(.debug_types) } \ 701 /* DWARF 5 */ \ 702 .debug_macro 0 : { *(.debug_macro) } \ 703 .debug_addr 0 : { *(.debug_addr) } 704 705 /* Stabs debugging sections. */ 706 #define STABS_DEBUG \ 707 .stab 0 : { *(.stab) } \ 708 .stabstr 0 : { *(.stabstr) } \ 709 .stab.excl 0 : { *(.stab.excl) } \ 710 .stab.exclstr 0 : { *(.stab.exclstr) } \ 711 .stab.index 0 : { *(.stab.index) } \ 712 .stab.indexstr 0 : { *(.stab.indexstr) } \ 713 .comment 0 : { *(.comment) } 714 715 #ifdef CONFIG_GENERIC_BUG 716 #define BUG_TABLE \ 717 . = ALIGN(8); \ 718 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 719 __start___bug_table = .; \ 720 KEEP(*(__bug_table)) \ 721 __stop___bug_table = .; \ 722 } 723 #else 724 #define BUG_TABLE 725 #endif 726 727 #ifdef CONFIG_UNWINDER_ORC 728 #define ORC_UNWIND_TABLE \ 729 . = ALIGN(4); \ 730 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \ 731 __start_orc_unwind_ip = .; \ 732 KEEP(*(.orc_unwind_ip)) \ 733 __stop_orc_unwind_ip = .; \ 734 } \ 735 . = ALIGN(2); \ 736 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \ 737 __start_orc_unwind = .; \ 738 KEEP(*(.orc_unwind)) \ 739 __stop_orc_unwind = .; \ 740 } \ 741 . = ALIGN(4); \ 742 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \ 743 orc_lookup = .; \ 744 . += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) / \ 745 LOOKUP_BLOCK_SIZE) + 1) * 4; \ 746 orc_lookup_end = .; \ 747 } 748 #else 749 #define ORC_UNWIND_TABLE 750 #endif 751 752 #ifdef CONFIG_PM_TRACE 753 #define TRACEDATA \ 754 . = ALIGN(4); \ 755 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 756 __tracedata_start = .; \ 757 KEEP(*(.tracedata)) \ 758 __tracedata_end = .; \ 759 } 760 #else 761 #define TRACEDATA 762 #endif 763 764 #define NOTES \ 765 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 766 __start_notes = .; \ 767 KEEP(*(.note.*)) \ 768 __stop_notes = .; \ 769 } 770 771 #define INIT_SETUP(initsetup_align) \ 772 . = ALIGN(initsetup_align); \ 773 __setup_start = .; \ 774 KEEP(*(.init.setup)) \ 775 __setup_end = .; 776 777 #define INIT_CALLS_LEVEL(level) \ 778 __initcall##level##_start = .; \ 779 KEEP(*(.initcall##level##.init)) \ 780 KEEP(*(.initcall##level##s.init)) \ 781 782 #define INIT_CALLS \ 783 __initcall_start = .; \ 784 KEEP(*(.initcallearly.init)) \ 785 INIT_CALLS_LEVEL(0) \ 786 INIT_CALLS_LEVEL(1) \ 787 INIT_CALLS_LEVEL(2) \ 788 INIT_CALLS_LEVEL(3) \ 789 INIT_CALLS_LEVEL(4) \ 790 INIT_CALLS_LEVEL(5) \ 791 INIT_CALLS_LEVEL(rootfs) \ 792 INIT_CALLS_LEVEL(6) \ 793 INIT_CALLS_LEVEL(7) \ 794 __initcall_end = .; 795 796 #define CON_INITCALL \ 797 __con_initcall_start = .; \ 798 KEEP(*(.con_initcall.init)) \ 799 __con_initcall_end = .; 800 801 #ifdef CONFIG_BLK_DEV_INITRD 802 #define INIT_RAM_FS \ 803 . = ALIGN(4); \ 804 __initramfs_start = .; \ 805 KEEP(*(.init.ramfs)) \ 806 . = ALIGN(8); \ 807 KEEP(*(.init.ramfs.info)) 808 #else 809 #define INIT_RAM_FS 810 #endif 811 812 /* 813 * Memory encryption operates on a page basis. Since we need to clear 814 * the memory encryption mask for this section, it needs to be aligned 815 * on a page boundary and be a page-size multiple in length. 816 * 817 * Note: We use a separate section so that only this section gets 818 * decrypted to avoid exposing more than we wish. 819 */ 820 #ifdef CONFIG_AMD_MEM_ENCRYPT 821 #define PERCPU_DECRYPTED_SECTION \ 822 . = ALIGN(PAGE_SIZE); \ 823 *(.data..percpu..decrypted) \ 824 . = ALIGN(PAGE_SIZE); 825 #else 826 #define PERCPU_DECRYPTED_SECTION 827 #endif 828 829 830 /* 831 * Default discarded sections. 832 * 833 * Some archs want to discard exit text/data at runtime rather than 834 * link time due to cross-section references such as alt instructions, 835 * bug table, eh_frame, etc. DISCARDS must be the last of output 836 * section definitions so that such archs put those in earlier section 837 * definitions. 838 */ 839 #define DISCARDS \ 840 /DISCARD/ : { \ 841 EXIT_TEXT \ 842 EXIT_DATA \ 843 EXIT_CALL \ 844 *(.discard) \ 845 *(.discard.*) \ 846 *(.modinfo) \ 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