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 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name) 207 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name) 208 #define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name) 209 #define _OF_TABLE_0(name) 210 #define _OF_TABLE_1(name) \ 211 . = ALIGN(8); \ 212 __##name##_of_table = .; \ 213 KEEP(*(__##name##_of_table)) \ 214 KEEP(*(__##name##_of_table_end)) 215 216 #define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer) 217 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip) 218 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk) 219 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem) 220 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method) 221 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method) 222 223 #ifdef CONFIG_ACPI 224 #define ACPI_PROBE_TABLE(name) \ 225 . = ALIGN(8); \ 226 __##name##_acpi_probe_table = .; \ 227 KEEP(*(__##name##_acpi_probe_table)) \ 228 __##name##_acpi_probe_table_end = .; 229 #else 230 #define ACPI_PROBE_TABLE(name) 231 #endif 232 233 #define KERNEL_DTB() \ 234 STRUCT_ALIGN(); \ 235 __dtb_start = .; \ 236 KEEP(*(.dtb.init.rodata)) \ 237 __dtb_end = .; 238 239 /* 240 * .data section 241 */ 242 #define DATA_DATA \ 243 *(.xiptext) \ 244 *(DATA_MAIN) \ 245 *(.ref.data) \ 246 *(.data..shared_aligned) /* percpu related */ \ 247 MEM_KEEP(init.data*) \ 248 MEM_KEEP(exit.data*) \ 249 *(.data.unlikely) \ 250 __start_once = .; \ 251 *(.data.once) \ 252 __end_once = .; \ 253 STRUCT_ALIGN(); \ 254 *(__tracepoints) \ 255 /* implement dynamic printk debug */ \ 256 . = ALIGN(8); \ 257 __start___jump_table = .; \ 258 KEEP(*(__jump_table)) \ 259 __stop___jump_table = .; \ 260 . = ALIGN(8); \ 261 __start___verbose = .; \ 262 KEEP(*(__verbose)) \ 263 __stop___verbose = .; \ 264 LIKELY_PROFILE() \ 265 BRANCH_PROFILE() \ 266 TRACE_PRINTKS() \ 267 BPF_RAW_TP() \ 268 TRACEPOINT_STR() 269 270 /* 271 * Data section helpers 272 */ 273 #define NOSAVE_DATA \ 274 . = ALIGN(PAGE_SIZE); \ 275 __nosave_begin = .; \ 276 *(.data..nosave) \ 277 . = ALIGN(PAGE_SIZE); \ 278 __nosave_end = .; 279 280 #define PAGE_ALIGNED_DATA(page_align) \ 281 . = ALIGN(page_align); \ 282 *(.data..page_aligned) \ 283 . = ALIGN(page_align); 284 285 #define READ_MOSTLY_DATA(align) \ 286 . = ALIGN(align); \ 287 *(.data..read_mostly) \ 288 . = ALIGN(align); 289 290 #define CACHELINE_ALIGNED_DATA(align) \ 291 . = ALIGN(align); \ 292 *(.data..cacheline_aligned) 293 294 #define INIT_TASK_DATA(align) \ 295 . = ALIGN(align); \ 296 __start_init_task = .; \ 297 init_thread_union = .; \ 298 init_stack = .; \ 299 KEEP(*(.data..init_task)) \ 300 KEEP(*(.data..init_thread_info)) \ 301 . = __start_init_task + THREAD_SIZE; \ 302 __end_init_task = .; 303 304 /* 305 * Allow architectures to handle ro_after_init data on their 306 * own by defining an empty RO_AFTER_INIT_DATA. 307 */ 308 #ifndef RO_AFTER_INIT_DATA 309 #define RO_AFTER_INIT_DATA \ 310 . = ALIGN(8); \ 311 __start_ro_after_init = .; \ 312 *(.data..ro_after_init) \ 313 __end_ro_after_init = .; 314 #endif 315 316 /* 317 * Read only Data 318 */ 319 #define RO_DATA_SECTION(align) \ 320 . = ALIGN((align)); \ 321 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 322 __start_rodata = .; \ 323 *(.rodata) *(.rodata.*) \ 324 RO_AFTER_INIT_DATA /* Read only after init */ \ 325 KEEP(*(__vermagic)) /* Kernel version magic */ \ 326 . = ALIGN(8); \ 327 __start___tracepoints_ptrs = .; \ 328 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \ 329 __stop___tracepoints_ptrs = .; \ 330 *(__tracepoints_strings)/* Tracepoints: strings */ \ 331 } \ 332 \ 333 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 334 *(.rodata1) \ 335 } \ 336 \ 337 /* PCI quirks */ \ 338 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 339 __start_pci_fixups_early = .; \ 340 KEEP(*(.pci_fixup_early)) \ 341 __end_pci_fixups_early = .; \ 342 __start_pci_fixups_header = .; \ 343 KEEP(*(.pci_fixup_header)) \ 344 __end_pci_fixups_header = .; \ 345 __start_pci_fixups_final = .; \ 346 KEEP(*(.pci_fixup_final)) \ 347 __end_pci_fixups_final = .; \ 348 __start_pci_fixups_enable = .; \ 349 KEEP(*(.pci_fixup_enable)) \ 350 __end_pci_fixups_enable = .; \ 351 __start_pci_fixups_resume = .; \ 352 KEEP(*(.pci_fixup_resume)) \ 353 __end_pci_fixups_resume = .; \ 354 __start_pci_fixups_resume_early = .; \ 355 KEEP(*(.pci_fixup_resume_early)) \ 356 __end_pci_fixups_resume_early = .; \ 357 __start_pci_fixups_suspend = .; \ 358 KEEP(*(.pci_fixup_suspend)) \ 359 __end_pci_fixups_suspend = .; \ 360 __start_pci_fixups_suspend_late = .; \ 361 KEEP(*(.pci_fixup_suspend_late)) \ 362 __end_pci_fixups_suspend_late = .; \ 363 } \ 364 \ 365 /* Built-in firmware blobs */ \ 366 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \ 367 __start_builtin_fw = .; \ 368 KEEP(*(.builtin_fw)) \ 369 __end_builtin_fw = .; \ 370 } \ 371 \ 372 TRACEDATA \ 373 \ 374 /* Kernel symbol table: Normal symbols */ \ 375 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 376 __start___ksymtab = .; \ 377 KEEP(*(SORT(___ksymtab+*))) \ 378 __stop___ksymtab = .; \ 379 } \ 380 \ 381 /* Kernel symbol table: GPL-only symbols */ \ 382 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 383 __start___ksymtab_gpl = .; \ 384 KEEP(*(SORT(___ksymtab_gpl+*))) \ 385 __stop___ksymtab_gpl = .; \ 386 } \ 387 \ 388 /* Kernel symbol table: Normal unused symbols */ \ 389 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \ 390 __start___ksymtab_unused = .; \ 391 KEEP(*(SORT(___ksymtab_unused+*))) \ 392 __stop___ksymtab_unused = .; \ 393 } \ 394 \ 395 /* Kernel symbol table: GPL-only unused symbols */ \ 396 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \ 397 __start___ksymtab_unused_gpl = .; \ 398 KEEP(*(SORT(___ksymtab_unused_gpl+*))) \ 399 __stop___ksymtab_unused_gpl = .; \ 400 } \ 401 \ 402 /* Kernel symbol table: GPL-future-only symbols */ \ 403 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \ 404 __start___ksymtab_gpl_future = .; \ 405 KEEP(*(SORT(___ksymtab_gpl_future+*))) \ 406 __stop___ksymtab_gpl_future = .; \ 407 } \ 408 \ 409 /* Kernel symbol table: Normal symbols */ \ 410 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 411 __start___kcrctab = .; \ 412 KEEP(*(SORT(___kcrctab+*))) \ 413 __stop___kcrctab = .; \ 414 } \ 415 \ 416 /* Kernel symbol table: GPL-only symbols */ \ 417 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 418 __start___kcrctab_gpl = .; \ 419 KEEP(*(SORT(___kcrctab_gpl+*))) \ 420 __stop___kcrctab_gpl = .; \ 421 } \ 422 \ 423 /* Kernel symbol table: Normal unused symbols */ \ 424 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \ 425 __start___kcrctab_unused = .; \ 426 KEEP(*(SORT(___kcrctab_unused+*))) \ 427 __stop___kcrctab_unused = .; \ 428 } \ 429 \ 430 /* Kernel symbol table: GPL-only unused symbols */ \ 431 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \ 432 __start___kcrctab_unused_gpl = .; \ 433 KEEP(*(SORT(___kcrctab_unused_gpl+*))) \ 434 __stop___kcrctab_unused_gpl = .; \ 435 } \ 436 \ 437 /* Kernel symbol table: GPL-future-only symbols */ \ 438 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \ 439 __start___kcrctab_gpl_future = .; \ 440 KEEP(*(SORT(___kcrctab_gpl_future+*))) \ 441 __stop___kcrctab_gpl_future = .; \ 442 } \ 443 \ 444 /* Kernel symbol table: strings */ \ 445 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 446 *(__ksymtab_strings) \ 447 } \ 448 \ 449 /* __*init sections */ \ 450 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 451 *(.ref.rodata) \ 452 MEM_KEEP(init.rodata) \ 453 MEM_KEEP(exit.rodata) \ 454 } \ 455 \ 456 /* Built-in module parameters. */ \ 457 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 458 __start___param = .; \ 459 KEEP(*(__param)) \ 460 __stop___param = .; \ 461 } \ 462 \ 463 /* Built-in module versions. */ \ 464 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 465 __start___modver = .; \ 466 KEEP(*(__modver)) \ 467 __stop___modver = .; \ 468 . = ALIGN((align)); \ 469 __end_rodata = .; \ 470 } \ 471 . = ALIGN((align)); 472 473 /* RODATA & RO_DATA provided for backward compatibility. 474 * All archs are supposed to use RO_DATA() */ 475 #define RODATA RO_DATA_SECTION(4096) 476 #define RO_DATA(align) RO_DATA_SECTION(align) 477 478 #define SECURITY_INIT \ 479 .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \ 480 __security_initcall_start = .; \ 481 KEEP(*(.security_initcall.init)) \ 482 __security_initcall_end = .; \ 483 } 484 485 /* 486 * .text section. Map to function alignment to avoid address changes 487 * during second ld run in second ld pass when generating System.map 488 * 489 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead 490 * code elimination is enabled, so these sections should be converted 491 * to use ".." first. 492 */ 493 #define TEXT_TEXT \ 494 ALIGN_FUNCTION(); \ 495 *(.text.hot TEXT_MAIN .text.fixup .text.unlikely) \ 496 *(.text..refcount) \ 497 *(.ref.text) \ 498 MEM_KEEP(init.text*) \ 499 MEM_KEEP(exit.text*) \ 500 501 502 /* sched.text is aling to function alignment to secure we have same 503 * address even at second ld pass when generating System.map */ 504 #define SCHED_TEXT \ 505 ALIGN_FUNCTION(); \ 506 __sched_text_start = .; \ 507 *(.sched.text) \ 508 __sched_text_end = .; 509 510 /* spinlock.text is aling to function alignment to secure we have same 511 * address even at second ld pass when generating System.map */ 512 #define LOCK_TEXT \ 513 ALIGN_FUNCTION(); \ 514 __lock_text_start = .; \ 515 *(.spinlock.text) \ 516 __lock_text_end = .; 517 518 #define CPUIDLE_TEXT \ 519 ALIGN_FUNCTION(); \ 520 __cpuidle_text_start = .; \ 521 *(.cpuidle.text) \ 522 __cpuidle_text_end = .; 523 524 #define KPROBES_TEXT \ 525 ALIGN_FUNCTION(); \ 526 __kprobes_text_start = .; \ 527 *(.kprobes.text) \ 528 __kprobes_text_end = .; 529 530 #define ENTRY_TEXT \ 531 ALIGN_FUNCTION(); \ 532 __entry_text_start = .; \ 533 *(.entry.text) \ 534 __entry_text_end = .; 535 536 #define IRQENTRY_TEXT \ 537 ALIGN_FUNCTION(); \ 538 __irqentry_text_start = .; \ 539 *(.irqentry.text) \ 540 __irqentry_text_end = .; 541 542 #define SOFTIRQENTRY_TEXT \ 543 ALIGN_FUNCTION(); \ 544 __softirqentry_text_start = .; \ 545 *(.softirqentry.text) \ 546 __softirqentry_text_end = .; 547 548 /* Section used for early init (in .S files) */ 549 #define HEAD_TEXT KEEP(*(.head.text)) 550 551 #define HEAD_TEXT_SECTION \ 552 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 553 HEAD_TEXT \ 554 } 555 556 /* 557 * Exception table 558 */ 559 #define EXCEPTION_TABLE(align) \ 560 . = ALIGN(align); \ 561 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 562 __start___ex_table = .; \ 563 KEEP(*(__ex_table)) \ 564 __stop___ex_table = .; \ 565 } 566 567 /* 568 * Init task 569 */ 570 #define INIT_TASK_DATA_SECTION(align) \ 571 . = ALIGN(align); \ 572 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 573 INIT_TASK_DATA(align) \ 574 } 575 576 #ifdef CONFIG_CONSTRUCTORS 577 #define KERNEL_CTORS() . = ALIGN(8); \ 578 __ctors_start = .; \ 579 KEEP(*(.ctors)) \ 580 KEEP(*(SORT(.init_array.*))) \ 581 KEEP(*(.init_array)) \ 582 __ctors_end = .; 583 #else 584 #define KERNEL_CTORS() 585 #endif 586 587 /* init and exit section handling */ 588 #define INIT_DATA \ 589 KEEP(*(SORT(___kentry+*))) \ 590 *(.init.data init.data.*) \ 591 MEM_DISCARD(init.data*) \ 592 KERNEL_CTORS() \ 593 MCOUNT_REC() \ 594 *(.init.rodata .init.rodata.*) \ 595 FTRACE_EVENTS() \ 596 TRACE_SYSCALLS() \ 597 KPROBE_BLACKLIST() \ 598 ERROR_INJECT_WHITELIST() \ 599 MEM_DISCARD(init.rodata) \ 600 CLK_OF_TABLES() \ 601 RESERVEDMEM_OF_TABLES() \ 602 TIMER_OF_TABLES() \ 603 CPU_METHOD_OF_TABLES() \ 604 CPUIDLE_METHOD_OF_TABLES() \ 605 KERNEL_DTB() \ 606 IRQCHIP_OF_MATCH_TABLE() \ 607 ACPI_PROBE_TABLE(irqchip) \ 608 ACPI_PROBE_TABLE(timer) \ 609 EARLYCON_TABLE() 610 611 #define INIT_TEXT \ 612 *(.init.text .init.text.*) \ 613 *(.text.startup) \ 614 MEM_DISCARD(init.text*) 615 616 #define EXIT_DATA \ 617 *(.exit.data .exit.data.*) \ 618 *(.fini_array .fini_array.*) \ 619 *(.dtors .dtors.*) \ 620 MEM_DISCARD(exit.data*) \ 621 MEM_DISCARD(exit.rodata*) 622 623 #define EXIT_TEXT \ 624 *(.exit.text) \ 625 *(.text.exit) \ 626 MEM_DISCARD(exit.text) 627 628 #define EXIT_CALL \ 629 *(.exitcall.exit) 630 631 /* 632 * bss (Block Started by Symbol) - uninitialized data 633 * zeroed during startup 634 */ 635 #define SBSS(sbss_align) \ 636 . = ALIGN(sbss_align); \ 637 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 638 *(.dynsbss) \ 639 *(SBSS_MAIN) \ 640 *(.scommon) \ 641 } 642 643 /* 644 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 645 * sections to the front of bss. 646 */ 647 #ifndef BSS_FIRST_SECTIONS 648 #define BSS_FIRST_SECTIONS 649 #endif 650 651 #define BSS(bss_align) \ 652 . = ALIGN(bss_align); \ 653 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 654 BSS_FIRST_SECTIONS \ 655 . = ALIGN(PAGE_SIZE); \ 656 *(.bss..page_aligned) \ 657 . = ALIGN(PAGE_SIZE); \ 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(2); \ 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