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 #ifdef CC_USING_PATCHABLE_FUNCTION_ENTRY 114 #define MCOUNT_REC() . = ALIGN(8); \ 115 __start_mcount_loc = .; \ 116 KEEP(*(__patchable_function_entries)) \ 117 __stop_mcount_loc = .; 118 #else 119 #define MCOUNT_REC() . = ALIGN(8); \ 120 __start_mcount_loc = .; \ 121 KEEP(*(__mcount_loc)) \ 122 __stop_mcount_loc = .; 123 #endif 124 #else 125 #define MCOUNT_REC() 126 #endif 127 128 #ifdef CONFIG_TRACE_BRANCH_PROFILING 129 #define LIKELY_PROFILE() __start_annotated_branch_profile = .; \ 130 KEEP(*(_ftrace_annotated_branch)) \ 131 __stop_annotated_branch_profile = .; 132 #else 133 #define LIKELY_PROFILE() 134 #endif 135 136 #ifdef CONFIG_PROFILE_ALL_BRANCHES 137 #define BRANCH_PROFILE() __start_branch_profile = .; \ 138 KEEP(*(_ftrace_branch)) \ 139 __stop_branch_profile = .; 140 #else 141 #define BRANCH_PROFILE() 142 #endif 143 144 #ifdef CONFIG_KPROBES 145 #define KPROBE_BLACKLIST() . = ALIGN(8); \ 146 __start_kprobe_blacklist = .; \ 147 KEEP(*(_kprobe_blacklist)) \ 148 __stop_kprobe_blacklist = .; 149 #else 150 #define KPROBE_BLACKLIST() 151 #endif 152 153 #ifdef CONFIG_FUNCTION_ERROR_INJECTION 154 #define ERROR_INJECT_WHITELIST() STRUCT_ALIGN(); \ 155 __start_error_injection_whitelist = .; \ 156 KEEP(*(_error_injection_whitelist)) \ 157 __stop_error_injection_whitelist = .; 158 #else 159 #define ERROR_INJECT_WHITELIST() 160 #endif 161 162 #ifdef CONFIG_EVENT_TRACING 163 #define FTRACE_EVENTS() . = ALIGN(8); \ 164 __start_ftrace_events = .; \ 165 KEEP(*(_ftrace_events)) \ 166 __stop_ftrace_events = .; \ 167 __start_ftrace_eval_maps = .; \ 168 KEEP(*(_ftrace_eval_map)) \ 169 __stop_ftrace_eval_maps = .; 170 #else 171 #define FTRACE_EVENTS() 172 #endif 173 174 #ifdef CONFIG_TRACING 175 #define TRACE_PRINTKS() __start___trace_bprintk_fmt = .; \ 176 KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \ 177 __stop___trace_bprintk_fmt = .; 178 #define TRACEPOINT_STR() __start___tracepoint_str = .; \ 179 KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \ 180 __stop___tracepoint_str = .; 181 #else 182 #define TRACE_PRINTKS() 183 #define TRACEPOINT_STR() 184 #endif 185 186 #ifdef CONFIG_FTRACE_SYSCALLS 187 #define TRACE_SYSCALLS() . = ALIGN(8); \ 188 __start_syscalls_metadata = .; \ 189 KEEP(*(__syscalls_metadata)) \ 190 __stop_syscalls_metadata = .; 191 #else 192 #define TRACE_SYSCALLS() 193 #endif 194 195 #ifdef CONFIG_BPF_EVENTS 196 #define BPF_RAW_TP() STRUCT_ALIGN(); \ 197 __start__bpf_raw_tp = .; \ 198 KEEP(*(__bpf_raw_tp_map)) \ 199 __stop__bpf_raw_tp = .; 200 #else 201 #define BPF_RAW_TP() 202 #endif 203 204 #ifdef CONFIG_SERIAL_EARLYCON 205 #define EARLYCON_TABLE() . = ALIGN(8); \ 206 __earlycon_table = .; \ 207 KEEP(*(__earlycon_table)) \ 208 __earlycon_table_end = .; 209 #else 210 #define EARLYCON_TABLE() 211 #endif 212 213 #ifdef CONFIG_SECURITY 214 #define LSM_TABLE() . = ALIGN(8); \ 215 __start_lsm_info = .; \ 216 KEEP(*(.lsm_info.init)) \ 217 __end_lsm_info = .; 218 #else 219 #define LSM_TABLE() 220 #endif 221 222 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name) 223 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name) 224 #define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name) 225 #define _OF_TABLE_0(name) 226 #define _OF_TABLE_1(name) \ 227 . = ALIGN(8); \ 228 __##name##_of_table = .; \ 229 KEEP(*(__##name##_of_table)) \ 230 KEEP(*(__##name##_of_table_end)) 231 232 #define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer) 233 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip) 234 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk) 235 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem) 236 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method) 237 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method) 238 239 #ifdef CONFIG_ACPI 240 #define ACPI_PROBE_TABLE(name) \ 241 . = ALIGN(8); \ 242 __##name##_acpi_probe_table = .; \ 243 KEEP(*(__##name##_acpi_probe_table)) \ 244 __##name##_acpi_probe_table_end = .; 245 #else 246 #define ACPI_PROBE_TABLE(name) 247 #endif 248 249 #define KERNEL_DTB() \ 250 STRUCT_ALIGN(); \ 251 __dtb_start = .; \ 252 KEEP(*(.dtb.init.rodata)) \ 253 __dtb_end = .; 254 255 /* 256 * .data section 257 */ 258 #define DATA_DATA \ 259 *(.xiptext) \ 260 *(DATA_MAIN) \ 261 *(.ref.data) \ 262 *(.data..shared_aligned) /* percpu related */ \ 263 MEM_KEEP(init.data*) \ 264 MEM_KEEP(exit.data*) \ 265 *(.data.unlikely) \ 266 __start_once = .; \ 267 *(.data.once) \ 268 __end_once = .; \ 269 STRUCT_ALIGN(); \ 270 *(__tracepoints) \ 271 /* implement dynamic printk debug */ \ 272 . = ALIGN(8); \ 273 __start___verbose = .; \ 274 KEEP(*(__verbose)) \ 275 __stop___verbose = .; \ 276 LIKELY_PROFILE() \ 277 BRANCH_PROFILE() \ 278 TRACE_PRINTKS() \ 279 BPF_RAW_TP() \ 280 TRACEPOINT_STR() 281 282 /* 283 * Data section helpers 284 */ 285 #define NOSAVE_DATA \ 286 . = ALIGN(PAGE_SIZE); \ 287 __nosave_begin = .; \ 288 *(.data..nosave) \ 289 . = ALIGN(PAGE_SIZE); \ 290 __nosave_end = .; 291 292 #define PAGE_ALIGNED_DATA(page_align) \ 293 . = ALIGN(page_align); \ 294 *(.data..page_aligned) 295 296 #define READ_MOSTLY_DATA(align) \ 297 . = ALIGN(align); \ 298 *(.data..read_mostly) \ 299 . = ALIGN(align); 300 301 #define CACHELINE_ALIGNED_DATA(align) \ 302 . = ALIGN(align); \ 303 *(.data..cacheline_aligned) 304 305 #define INIT_TASK_DATA(align) \ 306 . = ALIGN(align); \ 307 __start_init_task = .; \ 308 init_thread_union = .; \ 309 init_stack = .; \ 310 KEEP(*(.data..init_task)) \ 311 KEEP(*(.data..init_thread_info)) \ 312 . = __start_init_task + THREAD_SIZE; \ 313 __end_init_task = .; 314 315 #define JUMP_TABLE_DATA \ 316 . = ALIGN(8); \ 317 __start___jump_table = .; \ 318 KEEP(*(__jump_table)) \ 319 __stop___jump_table = .; 320 321 /* 322 * Allow architectures to handle ro_after_init data on their 323 * own by defining an empty RO_AFTER_INIT_DATA. 324 */ 325 #ifndef RO_AFTER_INIT_DATA 326 #define RO_AFTER_INIT_DATA \ 327 __start_ro_after_init = .; \ 328 *(.data..ro_after_init) \ 329 JUMP_TABLE_DATA \ 330 __end_ro_after_init = .; 331 #endif 332 333 /* 334 * Read only Data 335 */ 336 #define RO_DATA_SECTION(align) \ 337 . = ALIGN((align)); \ 338 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 339 __start_rodata = .; \ 340 *(.rodata) *(.rodata.*) \ 341 RO_AFTER_INIT_DATA /* Read only after init */ \ 342 . = ALIGN(8); \ 343 __start___tracepoints_ptrs = .; \ 344 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \ 345 __stop___tracepoints_ptrs = .; \ 346 *(__tracepoints_strings)/* Tracepoints: strings */ \ 347 } \ 348 \ 349 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 350 *(.rodata1) \ 351 } \ 352 \ 353 /* PCI quirks */ \ 354 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 355 __start_pci_fixups_early = .; \ 356 KEEP(*(.pci_fixup_early)) \ 357 __end_pci_fixups_early = .; \ 358 __start_pci_fixups_header = .; \ 359 KEEP(*(.pci_fixup_header)) \ 360 __end_pci_fixups_header = .; \ 361 __start_pci_fixups_final = .; \ 362 KEEP(*(.pci_fixup_final)) \ 363 __end_pci_fixups_final = .; \ 364 __start_pci_fixups_enable = .; \ 365 KEEP(*(.pci_fixup_enable)) \ 366 __end_pci_fixups_enable = .; \ 367 __start_pci_fixups_resume = .; \ 368 KEEP(*(.pci_fixup_resume)) \ 369 __end_pci_fixups_resume = .; \ 370 __start_pci_fixups_resume_early = .; \ 371 KEEP(*(.pci_fixup_resume_early)) \ 372 __end_pci_fixups_resume_early = .; \ 373 __start_pci_fixups_suspend = .; \ 374 KEEP(*(.pci_fixup_suspend)) \ 375 __end_pci_fixups_suspend = .; \ 376 __start_pci_fixups_suspend_late = .; \ 377 KEEP(*(.pci_fixup_suspend_late)) \ 378 __end_pci_fixups_suspend_late = .; \ 379 } \ 380 \ 381 /* Built-in firmware blobs */ \ 382 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \ 383 __start_builtin_fw = .; \ 384 KEEP(*(.builtin_fw)) \ 385 __end_builtin_fw = .; \ 386 } \ 387 \ 388 TRACEDATA \ 389 \ 390 /* Kernel symbol table: Normal symbols */ \ 391 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 392 __start___ksymtab = .; \ 393 KEEP(*(SORT(___ksymtab+*))) \ 394 __stop___ksymtab = .; \ 395 } \ 396 \ 397 /* Kernel symbol table: GPL-only symbols */ \ 398 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 399 __start___ksymtab_gpl = .; \ 400 KEEP(*(SORT(___ksymtab_gpl+*))) \ 401 __stop___ksymtab_gpl = .; \ 402 } \ 403 \ 404 /* Kernel symbol table: Normal unused symbols */ \ 405 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \ 406 __start___ksymtab_unused = .; \ 407 KEEP(*(SORT(___ksymtab_unused+*))) \ 408 __stop___ksymtab_unused = .; \ 409 } \ 410 \ 411 /* Kernel symbol table: GPL-only unused symbols */ \ 412 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \ 413 __start___ksymtab_unused_gpl = .; \ 414 KEEP(*(SORT(___ksymtab_unused_gpl+*))) \ 415 __stop___ksymtab_unused_gpl = .; \ 416 } \ 417 \ 418 /* Kernel symbol table: GPL-future-only symbols */ \ 419 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \ 420 __start___ksymtab_gpl_future = .; \ 421 KEEP(*(SORT(___ksymtab_gpl_future+*))) \ 422 __stop___ksymtab_gpl_future = .; \ 423 } \ 424 \ 425 /* Kernel symbol table: Normal symbols */ \ 426 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 427 __start___kcrctab = .; \ 428 KEEP(*(SORT(___kcrctab+*))) \ 429 __stop___kcrctab = .; \ 430 } \ 431 \ 432 /* Kernel symbol table: GPL-only symbols */ \ 433 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 434 __start___kcrctab_gpl = .; \ 435 KEEP(*(SORT(___kcrctab_gpl+*))) \ 436 __stop___kcrctab_gpl = .; \ 437 } \ 438 \ 439 /* Kernel symbol table: Normal unused symbols */ \ 440 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \ 441 __start___kcrctab_unused = .; \ 442 KEEP(*(SORT(___kcrctab_unused+*))) \ 443 __stop___kcrctab_unused = .; \ 444 } \ 445 \ 446 /* Kernel symbol table: GPL-only unused symbols */ \ 447 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \ 448 __start___kcrctab_unused_gpl = .; \ 449 KEEP(*(SORT(___kcrctab_unused_gpl+*))) \ 450 __stop___kcrctab_unused_gpl = .; \ 451 } \ 452 \ 453 /* Kernel symbol table: GPL-future-only symbols */ \ 454 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \ 455 __start___kcrctab_gpl_future = .; \ 456 KEEP(*(SORT(___kcrctab_gpl_future+*))) \ 457 __stop___kcrctab_gpl_future = .; \ 458 } \ 459 \ 460 /* Kernel symbol table: strings */ \ 461 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 462 *(__ksymtab_strings) \ 463 } \ 464 \ 465 /* __*init sections */ \ 466 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 467 *(.ref.rodata) \ 468 MEM_KEEP(init.rodata) \ 469 MEM_KEEP(exit.rodata) \ 470 } \ 471 \ 472 /* Built-in module parameters. */ \ 473 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 474 __start___param = .; \ 475 KEEP(*(__param)) \ 476 __stop___param = .; \ 477 } \ 478 \ 479 /* Built-in module versions. */ \ 480 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 481 __start___modver = .; \ 482 KEEP(*(__modver)) \ 483 __stop___modver = .; \ 484 . = ALIGN((align)); \ 485 __end_rodata = .; \ 486 } \ 487 . = ALIGN((align)); 488 489 /* RODATA & RO_DATA provided for backward compatibility. 490 * All archs are supposed to use RO_DATA() */ 491 #define RODATA RO_DATA_SECTION(4096) 492 #define RO_DATA(align) RO_DATA_SECTION(align) 493 494 /* 495 * .text section. Map to function alignment to avoid address changes 496 * during second ld run in second ld pass when generating System.map 497 * 498 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead 499 * code elimination is enabled, so these sections should be converted 500 * to use ".." first. 501 */ 502 #define TEXT_TEXT \ 503 ALIGN_FUNCTION(); \ 504 *(.text.hot TEXT_MAIN .text.fixup .text.unlikely) \ 505 *(.text..refcount) \ 506 *(.ref.text) \ 507 MEM_KEEP(init.text*) \ 508 MEM_KEEP(exit.text*) \ 509 510 511 /* sched.text is aling to function alignment to secure we have same 512 * address even at second ld pass when generating System.map */ 513 #define SCHED_TEXT \ 514 ALIGN_FUNCTION(); \ 515 __sched_text_start = .; \ 516 *(.sched.text) \ 517 __sched_text_end = .; 518 519 /* spinlock.text is aling to function alignment to secure we have same 520 * address even at second ld pass when generating System.map */ 521 #define LOCK_TEXT \ 522 ALIGN_FUNCTION(); \ 523 __lock_text_start = .; \ 524 *(.spinlock.text) \ 525 __lock_text_end = .; 526 527 #define CPUIDLE_TEXT \ 528 ALIGN_FUNCTION(); \ 529 __cpuidle_text_start = .; \ 530 *(.cpuidle.text) \ 531 __cpuidle_text_end = .; 532 533 #define KPROBES_TEXT \ 534 ALIGN_FUNCTION(); \ 535 __kprobes_text_start = .; \ 536 *(.kprobes.text) \ 537 __kprobes_text_end = .; 538 539 #define ENTRY_TEXT \ 540 ALIGN_FUNCTION(); \ 541 __entry_text_start = .; \ 542 *(.entry.text) \ 543 __entry_text_end = .; 544 545 #define IRQENTRY_TEXT \ 546 ALIGN_FUNCTION(); \ 547 __irqentry_text_start = .; \ 548 *(.irqentry.text) \ 549 __irqentry_text_end = .; 550 551 #define SOFTIRQENTRY_TEXT \ 552 ALIGN_FUNCTION(); \ 553 __softirqentry_text_start = .; \ 554 *(.softirqentry.text) \ 555 __softirqentry_text_end = .; 556 557 /* Section used for early init (in .S files) */ 558 #define HEAD_TEXT KEEP(*(.head.text)) 559 560 #define HEAD_TEXT_SECTION \ 561 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 562 HEAD_TEXT \ 563 } 564 565 /* 566 * Exception table 567 */ 568 #define EXCEPTION_TABLE(align) \ 569 . = ALIGN(align); \ 570 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 571 __start___ex_table = .; \ 572 KEEP(*(__ex_table)) \ 573 __stop___ex_table = .; \ 574 } 575 576 /* 577 * Init task 578 */ 579 #define INIT_TASK_DATA_SECTION(align) \ 580 . = ALIGN(align); \ 581 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 582 INIT_TASK_DATA(align) \ 583 } 584 585 #ifdef CONFIG_CONSTRUCTORS 586 #define KERNEL_CTORS() . = ALIGN(8); \ 587 __ctors_start = .; \ 588 KEEP(*(.ctors)) \ 589 KEEP(*(SORT(.init_array.*))) \ 590 KEEP(*(.init_array)) \ 591 __ctors_end = .; 592 #else 593 #define KERNEL_CTORS() 594 #endif 595 596 /* init and exit section handling */ 597 #define INIT_DATA \ 598 KEEP(*(SORT(___kentry+*))) \ 599 *(.init.data init.data.*) \ 600 MEM_DISCARD(init.data*) \ 601 KERNEL_CTORS() \ 602 MCOUNT_REC() \ 603 *(.init.rodata .init.rodata.*) \ 604 FTRACE_EVENTS() \ 605 TRACE_SYSCALLS() \ 606 KPROBE_BLACKLIST() \ 607 ERROR_INJECT_WHITELIST() \ 608 MEM_DISCARD(init.rodata) \ 609 CLK_OF_TABLES() \ 610 RESERVEDMEM_OF_TABLES() \ 611 TIMER_OF_TABLES() \ 612 CPU_METHOD_OF_TABLES() \ 613 CPUIDLE_METHOD_OF_TABLES() \ 614 KERNEL_DTB() \ 615 IRQCHIP_OF_MATCH_TABLE() \ 616 ACPI_PROBE_TABLE(irqchip) \ 617 ACPI_PROBE_TABLE(timer) \ 618 EARLYCON_TABLE() \ 619 LSM_TABLE() 620 621 #define INIT_TEXT \ 622 *(.init.text .init.text.*) \ 623 *(.text.startup) \ 624 MEM_DISCARD(init.text*) 625 626 #define EXIT_DATA \ 627 *(.exit.data .exit.data.*) \ 628 *(.fini_array .fini_array.*) \ 629 *(.dtors .dtors.*) \ 630 MEM_DISCARD(exit.data*) \ 631 MEM_DISCARD(exit.rodata*) 632 633 #define EXIT_TEXT \ 634 *(.exit.text) \ 635 *(.text.exit) \ 636 MEM_DISCARD(exit.text) 637 638 #define EXIT_CALL \ 639 *(.exitcall.exit) 640 641 /* 642 * bss (Block Started by Symbol) - uninitialized data 643 * zeroed during startup 644 */ 645 #define SBSS(sbss_align) \ 646 . = ALIGN(sbss_align); \ 647 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 648 *(.dynsbss) \ 649 *(SBSS_MAIN) \ 650 *(.scommon) \ 651 } 652 653 /* 654 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 655 * sections to the front of bss. 656 */ 657 #ifndef BSS_FIRST_SECTIONS 658 #define BSS_FIRST_SECTIONS 659 #endif 660 661 #define BSS(bss_align) \ 662 . = ALIGN(bss_align); \ 663 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 664 BSS_FIRST_SECTIONS \ 665 *(.bss..page_aligned) \ 666 *(.dynbss) \ 667 *(BSS_MAIN) \ 668 *(COMMON) \ 669 } 670 671 /* 672 * DWARF debug sections. 673 * Symbols in the DWARF debugging sections are relative to 674 * the beginning of the section so we begin them at 0. 675 */ 676 #define DWARF_DEBUG \ 677 /* DWARF 1 */ \ 678 .debug 0 : { *(.debug) } \ 679 .line 0 : { *(.line) } \ 680 /* GNU DWARF 1 extensions */ \ 681 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 682 .debug_sfnames 0 : { *(.debug_sfnames) } \ 683 /* DWARF 1.1 and DWARF 2 */ \ 684 .debug_aranges 0 : { *(.debug_aranges) } \ 685 .debug_pubnames 0 : { *(.debug_pubnames) } \ 686 /* DWARF 2 */ \ 687 .debug_info 0 : { *(.debug_info \ 688 .gnu.linkonce.wi.*) } \ 689 .debug_abbrev 0 : { *(.debug_abbrev) } \ 690 .debug_line 0 : { *(.debug_line) } \ 691 .debug_frame 0 : { *(.debug_frame) } \ 692 .debug_str 0 : { *(.debug_str) } \ 693 .debug_loc 0 : { *(.debug_loc) } \ 694 .debug_macinfo 0 : { *(.debug_macinfo) } \ 695 .debug_pubtypes 0 : { *(.debug_pubtypes) } \ 696 /* DWARF 3 */ \ 697 .debug_ranges 0 : { *(.debug_ranges) } \ 698 /* SGI/MIPS DWARF 2 extensions */ \ 699 .debug_weaknames 0 : { *(.debug_weaknames) } \ 700 .debug_funcnames 0 : { *(.debug_funcnames) } \ 701 .debug_typenames 0 : { *(.debug_typenames) } \ 702 .debug_varnames 0 : { *(.debug_varnames) } \ 703 /* GNU DWARF 2 extensions */ \ 704 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \ 705 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \ 706 /* DWARF 4 */ \ 707 .debug_types 0 : { *(.debug_types) } \ 708 /* DWARF 5 */ \ 709 .debug_macro 0 : { *(.debug_macro) } \ 710 .debug_addr 0 : { *(.debug_addr) } 711 712 /* Stabs debugging sections. */ 713 #define STABS_DEBUG \ 714 .stab 0 : { *(.stab) } \ 715 .stabstr 0 : { *(.stabstr) } \ 716 .stab.excl 0 : { *(.stab.excl) } \ 717 .stab.exclstr 0 : { *(.stab.exclstr) } \ 718 .stab.index 0 : { *(.stab.index) } \ 719 .stab.indexstr 0 : { *(.stab.indexstr) } \ 720 .comment 0 : { *(.comment) } 721 722 #ifdef CONFIG_GENERIC_BUG 723 #define BUG_TABLE \ 724 . = ALIGN(8); \ 725 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 726 __start___bug_table = .; \ 727 KEEP(*(__bug_table)) \ 728 __stop___bug_table = .; \ 729 } 730 #else 731 #define BUG_TABLE 732 #endif 733 734 #ifdef CONFIG_UNWINDER_ORC 735 #define ORC_UNWIND_TABLE \ 736 . = ALIGN(4); \ 737 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \ 738 __start_orc_unwind_ip = .; \ 739 KEEP(*(.orc_unwind_ip)) \ 740 __stop_orc_unwind_ip = .; \ 741 } \ 742 . = ALIGN(2); \ 743 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \ 744 __start_orc_unwind = .; \ 745 KEEP(*(.orc_unwind)) \ 746 __stop_orc_unwind = .; \ 747 } \ 748 . = ALIGN(4); \ 749 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \ 750 orc_lookup = .; \ 751 . += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) / \ 752 LOOKUP_BLOCK_SIZE) + 1) * 4; \ 753 orc_lookup_end = .; \ 754 } 755 #else 756 #define ORC_UNWIND_TABLE 757 #endif 758 759 #ifdef CONFIG_PM_TRACE 760 #define TRACEDATA \ 761 . = ALIGN(4); \ 762 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 763 __tracedata_start = .; \ 764 KEEP(*(.tracedata)) \ 765 __tracedata_end = .; \ 766 } 767 #else 768 #define TRACEDATA 769 #endif 770 771 #define NOTES \ 772 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 773 __start_notes = .; \ 774 KEEP(*(.note.*)) \ 775 __stop_notes = .; \ 776 } 777 778 #define INIT_SETUP(initsetup_align) \ 779 . = ALIGN(initsetup_align); \ 780 __setup_start = .; \ 781 KEEP(*(.init.setup)) \ 782 __setup_end = .; 783 784 #define INIT_CALLS_LEVEL(level) \ 785 __initcall##level##_start = .; \ 786 KEEP(*(.initcall##level##.init)) \ 787 KEEP(*(.initcall##level##s.init)) \ 788 789 #define INIT_CALLS \ 790 __initcall_start = .; \ 791 KEEP(*(.initcallearly.init)) \ 792 INIT_CALLS_LEVEL(0) \ 793 INIT_CALLS_LEVEL(1) \ 794 INIT_CALLS_LEVEL(2) \ 795 INIT_CALLS_LEVEL(3) \ 796 INIT_CALLS_LEVEL(4) \ 797 INIT_CALLS_LEVEL(5) \ 798 INIT_CALLS_LEVEL(rootfs) \ 799 INIT_CALLS_LEVEL(6) \ 800 INIT_CALLS_LEVEL(7) \ 801 __initcall_end = .; 802 803 #define CON_INITCALL \ 804 __con_initcall_start = .; \ 805 KEEP(*(.con_initcall.init)) \ 806 __con_initcall_end = .; 807 808 #ifdef CONFIG_BLK_DEV_INITRD 809 #define INIT_RAM_FS \ 810 . = ALIGN(4); \ 811 __initramfs_start = .; \ 812 KEEP(*(.init.ramfs)) \ 813 . = ALIGN(8); \ 814 KEEP(*(.init.ramfs.info)) 815 #else 816 #define INIT_RAM_FS 817 #endif 818 819 /* 820 * Memory encryption operates on a page basis. Since we need to clear 821 * the memory encryption mask for this section, it needs to be aligned 822 * on a page boundary and be a page-size multiple in length. 823 * 824 * Note: We use a separate section so that only this section gets 825 * decrypted to avoid exposing more than we wish. 826 */ 827 #ifdef CONFIG_AMD_MEM_ENCRYPT 828 #define PERCPU_DECRYPTED_SECTION \ 829 . = ALIGN(PAGE_SIZE); \ 830 *(.data..percpu..decrypted) \ 831 . = ALIGN(PAGE_SIZE); 832 #else 833 #define PERCPU_DECRYPTED_SECTION 834 #endif 835 836 837 /* 838 * Default discarded sections. 839 * 840 * Some archs want to discard exit text/data at runtime rather than 841 * link time due to cross-section references such as alt instructions, 842 * bug table, eh_frame, etc. DISCARDS must be the last of output 843 * section definitions so that such archs put those in earlier section 844 * definitions. 845 */ 846 #define DISCARDS \ 847 /DISCARD/ : { \ 848 EXIT_TEXT \ 849 EXIT_DATA \ 850 EXIT_CALL \ 851 *(.discard) \ 852 *(.discard.*) \ 853 *(.modinfo) \ 854 } 855 856 /** 857 * PERCPU_INPUT - the percpu input sections 858 * @cacheline: cacheline size 859 * 860 * The core percpu section names and core symbols which do not rely 861 * directly upon load addresses. 862 * 863 * @cacheline is used to align subsections to avoid false cacheline 864 * sharing between subsections for different purposes. 865 */ 866 #define PERCPU_INPUT(cacheline) \ 867 __per_cpu_start = .; \ 868 *(.data..percpu..first) \ 869 . = ALIGN(PAGE_SIZE); \ 870 *(.data..percpu..page_aligned) \ 871 . = ALIGN(cacheline); \ 872 *(.data..percpu..read_mostly) \ 873 . = ALIGN(cacheline); \ 874 *(.data..percpu) \ 875 *(.data..percpu..shared_aligned) \ 876 PERCPU_DECRYPTED_SECTION \ 877 __per_cpu_end = .; 878 879 /** 880 * PERCPU_VADDR - define output section for percpu area 881 * @cacheline: cacheline size 882 * @vaddr: explicit base address (optional) 883 * @phdr: destination PHDR (optional) 884 * 885 * Macro which expands to output section for percpu area. 886 * 887 * @cacheline is used to align subsections to avoid false cacheline 888 * sharing between subsections for different purposes. 889 * 890 * If @vaddr is not blank, it specifies explicit base address and all 891 * percpu symbols will be offset from the given address. If blank, 892 * @vaddr always equals @laddr + LOAD_OFFSET. 893 * 894 * @phdr defines the output PHDR to use if not blank. Be warned that 895 * output PHDR is sticky. If @phdr is specified, the next output 896 * section in the linker script will go there too. @phdr should have 897 * a leading colon. 898 * 899 * Note that this macros defines __per_cpu_load as an absolute symbol. 900 * If there is no need to put the percpu section at a predetermined 901 * address, use PERCPU_SECTION. 902 */ 903 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 904 __per_cpu_load = .; \ 905 .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \ 906 PERCPU_INPUT(cacheline) \ 907 } phdr \ 908 . = __per_cpu_load + SIZEOF(.data..percpu); 909 910 /** 911 * PERCPU_SECTION - define output section for percpu area, simple version 912 * @cacheline: cacheline size 913 * 914 * Align to PAGE_SIZE and outputs output section for percpu area. This 915 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 916 * __per_cpu_start will be identical. 917 * 918 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 919 * except that __per_cpu_load is defined as a relative symbol against 920 * .data..percpu which is required for relocatable x86_32 configuration. 921 */ 922 #define PERCPU_SECTION(cacheline) \ 923 . = ALIGN(PAGE_SIZE); \ 924 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 925 __per_cpu_load = .; \ 926 PERCPU_INPUT(cacheline) \ 927 } 928 929 930 /* 931 * Definition of the high level *_SECTION macros 932 * They will fit only a subset of the architectures 933 */ 934 935 936 /* 937 * Writeable data. 938 * All sections are combined in a single .data section. 939 * The sections following CONSTRUCTORS are arranged so their 940 * typical alignment matches. 941 * A cacheline is typical/always less than a PAGE_SIZE so 942 * the sections that has this restriction (or similar) 943 * is located before the ones requiring PAGE_SIZE alignment. 944 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 945 * matches the requirement of PAGE_ALIGNED_DATA. 946 * 947 * use 0 as page_align if page_aligned data is not used */ 948 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \ 949 . = ALIGN(PAGE_SIZE); \ 950 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 951 INIT_TASK_DATA(inittask) \ 952 NOSAVE_DATA \ 953 PAGE_ALIGNED_DATA(pagealigned) \ 954 CACHELINE_ALIGNED_DATA(cacheline) \ 955 READ_MOSTLY_DATA(cacheline) \ 956 DATA_DATA \ 957 CONSTRUCTORS \ 958 } \ 959 BUG_TABLE \ 960 961 #define INIT_TEXT_SECTION(inittext_align) \ 962 . = ALIGN(inittext_align); \ 963 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 964 _sinittext = .; \ 965 INIT_TEXT \ 966 _einittext = .; \ 967 } 968 969 #define INIT_DATA_SECTION(initsetup_align) \ 970 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 971 INIT_DATA \ 972 INIT_SETUP(initsetup_align) \ 973 INIT_CALLS \ 974 CON_INITCALL \ 975 INIT_RAM_FS \ 976 } 977 978 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 979 . = ALIGN(sbss_align); \ 980 __bss_start = .; \ 981 SBSS(sbss_align) \ 982 BSS(bss_align) \ 983 . = ALIGN(stop_align); \ 984 __bss_stop = .; 985