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(PAGE_SIZE) 27 * RW_DATA(...) 28 * _edata = .; 29 * 30 * EXCEPTION_TABLE(...) 31 * 32 * BSS_SECTION(0, 0, 0) 33 * _end = .; 34 * 35 * STABS_DEBUG 36 * DWARF_DEBUG 37 * 38 * DISCARDS // must be the last 39 * } 40 * 41 * [__init_begin, __init_end] is the init section that may be freed after init 42 * // __init_begin and __init_end should be page aligned, so that we can 43 * // free the whole .init memory 44 * [_stext, _etext] is the text section 45 * [_sdata, _edata] is the data section 46 * 47 * Some of the included output section have their own set of constants. 48 * Examples are: [__initramfs_start, __initramfs_end] for initramfs and 49 * [__nosave_begin, __nosave_end] for the nosave data 50 */ 51 52 #ifndef LOAD_OFFSET 53 #define LOAD_OFFSET 0 54 #endif 55 56 /* 57 * Only some architectures want to have the .notes segment visible in 58 * a separate PT_NOTE ELF Program Header. When this happens, it needs 59 * to be visible in both the kernel text's PT_LOAD and the PT_NOTE 60 * Program Headers. In this case, though, the PT_LOAD needs to be made 61 * the default again so that all the following sections don't also end 62 * up in the PT_NOTE Program Header. 63 */ 64 #ifdef EMITS_PT_NOTE 65 #define NOTES_HEADERS :text :note 66 #define NOTES_HEADERS_RESTORE __restore_ph : { *(.__restore_ph) } :text 67 #else 68 #define NOTES_HEADERS 69 #define NOTES_HEADERS_RESTORE 70 #endif 71 72 /* 73 * Some architectures have non-executable read-only exception tables. 74 * They can be added to the RO_DATA segment by specifying their desired 75 * alignment. 76 */ 77 #ifdef RO_EXCEPTION_TABLE_ALIGN 78 #define RO_EXCEPTION_TABLE EXCEPTION_TABLE(RO_EXCEPTION_TABLE_ALIGN) 79 #else 80 #define RO_EXCEPTION_TABLE 81 #endif 82 83 /* Align . to a 8 byte boundary equals to maximum function alignment. */ 84 #define ALIGN_FUNCTION() . = ALIGN(8) 85 86 /* 87 * LD_DEAD_CODE_DATA_ELIMINATION option enables -fdata-sections, which 88 * generates .data.identifier sections, which need to be pulled in with 89 * .data. We don't want to pull in .data..other sections, which Linux 90 * has defined. Same for text and bss. 91 * 92 * RODATA_MAIN is not used because existing code already defines .rodata.x 93 * sections to be brought in with rodata. 94 */ 95 #ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 96 #define TEXT_MAIN .text .text.[0-9a-zA-Z_]* 97 #define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..LPBX* 98 #define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]* 99 #define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]* 100 #define BSS_MAIN .bss .bss.[0-9a-zA-Z_]* 101 #define SBSS_MAIN .sbss .sbss.[0-9a-zA-Z_]* 102 #else 103 #define TEXT_MAIN .text 104 #define DATA_MAIN .data 105 #define SDATA_MAIN .sdata 106 #define RODATA_MAIN .rodata 107 #define BSS_MAIN .bss 108 #define SBSS_MAIN .sbss 109 #endif 110 111 /* 112 * GCC 4.5 and later have a 32 bytes section alignment for structures. 113 * Except GCC 4.9, that feels the need to align on 64 bytes. 114 */ 115 #if __GNUC__ == 4 && __GNUC_MINOR__ == 9 116 #define STRUCT_ALIGNMENT 64 117 #else 118 #define STRUCT_ALIGNMENT 32 119 #endif 120 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT) 121 122 /* 123 * The order of the sched class addresses are important, as they are 124 * used to determine the order of the priority of each sched class in 125 * relation to each other. 126 */ 127 #define SCHED_DATA \ 128 STRUCT_ALIGN(); \ 129 __begin_sched_classes = .; \ 130 *(__idle_sched_class) \ 131 *(__fair_sched_class) \ 132 *(__rt_sched_class) \ 133 *(__dl_sched_class) \ 134 *(__stop_sched_class) \ 135 __end_sched_classes = .; 136 137 /* The actual configuration determine if the init/exit sections 138 * are handled as text/data or they can be discarded (which 139 * often happens at runtime) 140 */ 141 #ifdef CONFIG_HOTPLUG_CPU 142 #define CPU_KEEP(sec) *(.cpu##sec) 143 #define CPU_DISCARD(sec) 144 #else 145 #define CPU_KEEP(sec) 146 #define CPU_DISCARD(sec) *(.cpu##sec) 147 #endif 148 149 #if defined(CONFIG_MEMORY_HOTPLUG) 150 #define MEM_KEEP(sec) *(.mem##sec) 151 #define MEM_DISCARD(sec) 152 #else 153 #define MEM_KEEP(sec) 154 #define MEM_DISCARD(sec) *(.mem##sec) 155 #endif 156 157 #ifdef CONFIG_FTRACE_MCOUNT_RECORD 158 /* 159 * The ftrace call sites are logged to a section whose name depends on the 160 * compiler option used. A given kernel image will only use one, AKA 161 * FTRACE_CALLSITE_SECTION. We capture all of them here to avoid header 162 * dependencies for FTRACE_CALLSITE_SECTION's definition. 163 * 164 * Need to also make ftrace_stub_graph point to ftrace_stub 165 * so that the same stub location may have different protocols 166 * and not mess up with C verifiers. 167 */ 168 #define MCOUNT_REC() . = ALIGN(8); \ 169 __start_mcount_loc = .; \ 170 KEEP(*(__mcount_loc)) \ 171 KEEP(*(__patchable_function_entries)) \ 172 __stop_mcount_loc = .; \ 173 ftrace_stub_graph = ftrace_stub; 174 #else 175 # ifdef CONFIG_FUNCTION_TRACER 176 # define MCOUNT_REC() ftrace_stub_graph = ftrace_stub; 177 # else 178 # define MCOUNT_REC() 179 # endif 180 #endif 181 182 #ifdef CONFIG_TRACE_BRANCH_PROFILING 183 #define LIKELY_PROFILE() __start_annotated_branch_profile = .; \ 184 KEEP(*(_ftrace_annotated_branch)) \ 185 __stop_annotated_branch_profile = .; 186 #else 187 #define LIKELY_PROFILE() 188 #endif 189 190 #ifdef CONFIG_PROFILE_ALL_BRANCHES 191 #define BRANCH_PROFILE() __start_branch_profile = .; \ 192 KEEP(*(_ftrace_branch)) \ 193 __stop_branch_profile = .; 194 #else 195 #define BRANCH_PROFILE() 196 #endif 197 198 #ifdef CONFIG_KPROBES 199 #define KPROBE_BLACKLIST() . = ALIGN(8); \ 200 __start_kprobe_blacklist = .; \ 201 KEEP(*(_kprobe_blacklist)) \ 202 __stop_kprobe_blacklist = .; 203 #else 204 #define KPROBE_BLACKLIST() 205 #endif 206 207 #ifdef CONFIG_FUNCTION_ERROR_INJECTION 208 #define ERROR_INJECT_WHITELIST() STRUCT_ALIGN(); \ 209 __start_error_injection_whitelist = .; \ 210 KEEP(*(_error_injection_whitelist)) \ 211 __stop_error_injection_whitelist = .; 212 #else 213 #define ERROR_INJECT_WHITELIST() 214 #endif 215 216 #ifdef CONFIG_EVENT_TRACING 217 #define FTRACE_EVENTS() . = ALIGN(8); \ 218 __start_ftrace_events = .; \ 219 KEEP(*(_ftrace_events)) \ 220 __stop_ftrace_events = .; \ 221 __start_ftrace_eval_maps = .; \ 222 KEEP(*(_ftrace_eval_map)) \ 223 __stop_ftrace_eval_maps = .; 224 #else 225 #define FTRACE_EVENTS() 226 #endif 227 228 #ifdef CONFIG_TRACING 229 #define TRACE_PRINTKS() __start___trace_bprintk_fmt = .; \ 230 KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \ 231 __stop___trace_bprintk_fmt = .; 232 #define TRACEPOINT_STR() __start___tracepoint_str = .; \ 233 KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \ 234 __stop___tracepoint_str = .; 235 #else 236 #define TRACE_PRINTKS() 237 #define TRACEPOINT_STR() 238 #endif 239 240 #ifdef CONFIG_FTRACE_SYSCALLS 241 #define TRACE_SYSCALLS() . = ALIGN(8); \ 242 __start_syscalls_metadata = .; \ 243 KEEP(*(__syscalls_metadata)) \ 244 __stop_syscalls_metadata = .; 245 #else 246 #define TRACE_SYSCALLS() 247 #endif 248 249 #ifdef CONFIG_BPF_EVENTS 250 #define BPF_RAW_TP() STRUCT_ALIGN(); \ 251 __start__bpf_raw_tp = .; \ 252 KEEP(*(__bpf_raw_tp_map)) \ 253 __stop__bpf_raw_tp = .; 254 #else 255 #define BPF_RAW_TP() 256 #endif 257 258 #ifdef CONFIG_SERIAL_EARLYCON 259 #define EARLYCON_TABLE() . = ALIGN(8); \ 260 __earlycon_table = .; \ 261 KEEP(*(__earlycon_table)) \ 262 __earlycon_table_end = .; 263 #else 264 #define EARLYCON_TABLE() 265 #endif 266 267 #ifdef CONFIG_SECURITY 268 #define LSM_TABLE() . = ALIGN(8); \ 269 __start_lsm_info = .; \ 270 KEEP(*(.lsm_info.init)) \ 271 __end_lsm_info = .; 272 #define EARLY_LSM_TABLE() . = ALIGN(8); \ 273 __start_early_lsm_info = .; \ 274 KEEP(*(.early_lsm_info.init)) \ 275 __end_early_lsm_info = .; 276 #else 277 #define LSM_TABLE() 278 #define EARLY_LSM_TABLE() 279 #endif 280 281 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name) 282 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name) 283 #define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name) 284 #define _OF_TABLE_0(name) 285 #define _OF_TABLE_1(name) \ 286 . = ALIGN(8); \ 287 __##name##_of_table = .; \ 288 KEEP(*(__##name##_of_table)) \ 289 KEEP(*(__##name##_of_table_end)) 290 291 #define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer) 292 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip) 293 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk) 294 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem) 295 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method) 296 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method) 297 298 #ifdef CONFIG_ACPI 299 #define ACPI_PROBE_TABLE(name) \ 300 . = ALIGN(8); \ 301 __##name##_acpi_probe_table = .; \ 302 KEEP(*(__##name##_acpi_probe_table)) \ 303 __##name##_acpi_probe_table_end = .; 304 #else 305 #define ACPI_PROBE_TABLE(name) 306 #endif 307 308 #ifdef CONFIG_THERMAL 309 #define THERMAL_TABLE(name) \ 310 . = ALIGN(8); \ 311 __##name##_thermal_table = .; \ 312 KEEP(*(__##name##_thermal_table)) \ 313 __##name##_thermal_table_end = .; 314 #else 315 #define THERMAL_TABLE(name) 316 #endif 317 318 #define KERNEL_DTB() \ 319 STRUCT_ALIGN(); \ 320 __dtb_start = .; \ 321 KEEP(*(.dtb.init.rodata)) \ 322 __dtb_end = .; 323 324 /* 325 * .data section 326 */ 327 #define DATA_DATA \ 328 *(.xiptext) \ 329 *(DATA_MAIN) \ 330 *(.ref.data) \ 331 *(.data..shared_aligned) /* percpu related */ \ 332 MEM_KEEP(init.data*) \ 333 MEM_KEEP(exit.data*) \ 334 *(.data.unlikely) \ 335 __start_once = .; \ 336 *(.data.once) \ 337 __end_once = .; \ 338 STRUCT_ALIGN(); \ 339 *(__tracepoints) \ 340 /* implement dynamic printk debug */ \ 341 . = ALIGN(8); \ 342 __start___verbose = .; \ 343 KEEP(*(__verbose)) \ 344 __stop___verbose = .; \ 345 LIKELY_PROFILE() \ 346 BRANCH_PROFILE() \ 347 TRACE_PRINTKS() \ 348 BPF_RAW_TP() \ 349 TRACEPOINT_STR() 350 351 /* 352 * Data section helpers 353 */ 354 #define NOSAVE_DATA \ 355 . = ALIGN(PAGE_SIZE); \ 356 __nosave_begin = .; \ 357 *(.data..nosave) \ 358 . = ALIGN(PAGE_SIZE); \ 359 __nosave_end = .; 360 361 #define PAGE_ALIGNED_DATA(page_align) \ 362 . = ALIGN(page_align); \ 363 *(.data..page_aligned) \ 364 . = ALIGN(page_align); 365 366 #define READ_MOSTLY_DATA(align) \ 367 . = ALIGN(align); \ 368 *(.data..read_mostly) \ 369 . = ALIGN(align); 370 371 #define CACHELINE_ALIGNED_DATA(align) \ 372 . = ALIGN(align); \ 373 *(.data..cacheline_aligned) 374 375 #define INIT_TASK_DATA(align) \ 376 . = ALIGN(align); \ 377 __start_init_task = .; \ 378 init_thread_union = .; \ 379 init_stack = .; \ 380 KEEP(*(.data..init_task)) \ 381 KEEP(*(.data..init_thread_info)) \ 382 . = __start_init_task + THREAD_SIZE; \ 383 __end_init_task = .; 384 385 #define JUMP_TABLE_DATA \ 386 . = ALIGN(8); \ 387 __start___jump_table = .; \ 388 KEEP(*(__jump_table)) \ 389 __stop___jump_table = .; 390 391 /* 392 * Allow architectures to handle ro_after_init data on their 393 * own by defining an empty RO_AFTER_INIT_DATA. 394 */ 395 #ifndef RO_AFTER_INIT_DATA 396 #define RO_AFTER_INIT_DATA \ 397 __start_ro_after_init = .; \ 398 *(.data..ro_after_init) \ 399 JUMP_TABLE_DATA \ 400 __end_ro_after_init = .; 401 #endif 402 403 /* 404 * Read only Data 405 */ 406 #define RO_DATA(align) \ 407 . = ALIGN((align)); \ 408 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 409 __start_rodata = .; \ 410 *(.rodata) *(.rodata.*) \ 411 SCHED_DATA \ 412 RO_AFTER_INIT_DATA /* Read only after init */ \ 413 . = ALIGN(8); \ 414 __start___tracepoints_ptrs = .; \ 415 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \ 416 __stop___tracepoints_ptrs = .; \ 417 *(__tracepoints_strings)/* Tracepoints: strings */ \ 418 } \ 419 \ 420 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 421 *(.rodata1) \ 422 } \ 423 \ 424 /* PCI quirks */ \ 425 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 426 __start_pci_fixups_early = .; \ 427 KEEP(*(.pci_fixup_early)) \ 428 __end_pci_fixups_early = .; \ 429 __start_pci_fixups_header = .; \ 430 KEEP(*(.pci_fixup_header)) \ 431 __end_pci_fixups_header = .; \ 432 __start_pci_fixups_final = .; \ 433 KEEP(*(.pci_fixup_final)) \ 434 __end_pci_fixups_final = .; \ 435 __start_pci_fixups_enable = .; \ 436 KEEP(*(.pci_fixup_enable)) \ 437 __end_pci_fixups_enable = .; \ 438 __start_pci_fixups_resume = .; \ 439 KEEP(*(.pci_fixup_resume)) \ 440 __end_pci_fixups_resume = .; \ 441 __start_pci_fixups_resume_early = .; \ 442 KEEP(*(.pci_fixup_resume_early)) \ 443 __end_pci_fixups_resume_early = .; \ 444 __start_pci_fixups_suspend = .; \ 445 KEEP(*(.pci_fixup_suspend)) \ 446 __end_pci_fixups_suspend = .; \ 447 __start_pci_fixups_suspend_late = .; \ 448 KEEP(*(.pci_fixup_suspend_late)) \ 449 __end_pci_fixups_suspend_late = .; \ 450 } \ 451 \ 452 /* Built-in firmware blobs */ \ 453 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \ 454 __start_builtin_fw = .; \ 455 KEEP(*(.builtin_fw)) \ 456 __end_builtin_fw = .; \ 457 } \ 458 \ 459 TRACEDATA \ 460 \ 461 /* Kernel symbol table: Normal symbols */ \ 462 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 463 __start___ksymtab = .; \ 464 KEEP(*(SORT(___ksymtab+*))) \ 465 __stop___ksymtab = .; \ 466 } \ 467 \ 468 /* Kernel symbol table: GPL-only symbols */ \ 469 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 470 __start___ksymtab_gpl = .; \ 471 KEEP(*(SORT(___ksymtab_gpl+*))) \ 472 __stop___ksymtab_gpl = .; \ 473 } \ 474 \ 475 /* Kernel symbol table: Normal unused symbols */ \ 476 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \ 477 __start___ksymtab_unused = .; \ 478 KEEP(*(SORT(___ksymtab_unused+*))) \ 479 __stop___ksymtab_unused = .; \ 480 } \ 481 \ 482 /* Kernel symbol table: GPL-only unused symbols */ \ 483 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \ 484 __start___ksymtab_unused_gpl = .; \ 485 KEEP(*(SORT(___ksymtab_unused_gpl+*))) \ 486 __stop___ksymtab_unused_gpl = .; \ 487 } \ 488 \ 489 /* Kernel symbol table: GPL-future-only symbols */ \ 490 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \ 491 __start___ksymtab_gpl_future = .; \ 492 KEEP(*(SORT(___ksymtab_gpl_future+*))) \ 493 __stop___ksymtab_gpl_future = .; \ 494 } \ 495 \ 496 /* Kernel symbol table: Normal symbols */ \ 497 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 498 __start___kcrctab = .; \ 499 KEEP(*(SORT(___kcrctab+*))) \ 500 __stop___kcrctab = .; \ 501 } \ 502 \ 503 /* Kernel symbol table: GPL-only symbols */ \ 504 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 505 __start___kcrctab_gpl = .; \ 506 KEEP(*(SORT(___kcrctab_gpl+*))) \ 507 __stop___kcrctab_gpl = .; \ 508 } \ 509 \ 510 /* Kernel symbol table: Normal unused symbols */ \ 511 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \ 512 __start___kcrctab_unused = .; \ 513 KEEP(*(SORT(___kcrctab_unused+*))) \ 514 __stop___kcrctab_unused = .; \ 515 } \ 516 \ 517 /* Kernel symbol table: GPL-only unused symbols */ \ 518 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \ 519 __start___kcrctab_unused_gpl = .; \ 520 KEEP(*(SORT(___kcrctab_unused_gpl+*))) \ 521 __stop___kcrctab_unused_gpl = .; \ 522 } \ 523 \ 524 /* Kernel symbol table: GPL-future-only symbols */ \ 525 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \ 526 __start___kcrctab_gpl_future = .; \ 527 KEEP(*(SORT(___kcrctab_gpl_future+*))) \ 528 __stop___kcrctab_gpl_future = .; \ 529 } \ 530 \ 531 /* Kernel symbol table: strings */ \ 532 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 533 *(__ksymtab_strings) \ 534 } \ 535 \ 536 /* __*init sections */ \ 537 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 538 *(.ref.rodata) \ 539 MEM_KEEP(init.rodata) \ 540 MEM_KEEP(exit.rodata) \ 541 } \ 542 \ 543 /* Built-in module parameters. */ \ 544 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 545 __start___param = .; \ 546 KEEP(*(__param)) \ 547 __stop___param = .; \ 548 } \ 549 \ 550 /* Built-in module versions. */ \ 551 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 552 __start___modver = .; \ 553 KEEP(*(__modver)) \ 554 __stop___modver = .; \ 555 } \ 556 \ 557 RO_EXCEPTION_TABLE \ 558 NOTES \ 559 BTF \ 560 \ 561 . = ALIGN((align)); \ 562 __end_rodata = .; 563 564 /* 565 * Non-instrumentable text section 566 */ 567 #define NOINSTR_TEXT \ 568 ALIGN_FUNCTION(); \ 569 __noinstr_text_start = .; \ 570 *(.noinstr.text) \ 571 __noinstr_text_end = .; 572 573 /* 574 * .text section. Map to function alignment to avoid address changes 575 * during second ld run in second ld pass when generating System.map 576 * 577 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead 578 * code elimination is enabled, so these sections should be converted 579 * to use ".." first. 580 */ 581 #define TEXT_TEXT \ 582 ALIGN_FUNCTION(); \ 583 *(.text.hot TEXT_MAIN .text.fixup .text.unlikely) \ 584 NOINSTR_TEXT \ 585 *(.text..refcount) \ 586 *(.ref.text) \ 587 MEM_KEEP(init.text*) \ 588 MEM_KEEP(exit.text*) \ 589 590 591 /* sched.text is aling to function alignment to secure we have same 592 * address even at second ld pass when generating System.map */ 593 #define SCHED_TEXT \ 594 ALIGN_FUNCTION(); \ 595 __sched_text_start = .; \ 596 *(.sched.text) \ 597 __sched_text_end = .; 598 599 /* spinlock.text is aling to function alignment to secure we have same 600 * address even at second ld pass when generating System.map */ 601 #define LOCK_TEXT \ 602 ALIGN_FUNCTION(); \ 603 __lock_text_start = .; \ 604 *(.spinlock.text) \ 605 __lock_text_end = .; 606 607 #define CPUIDLE_TEXT \ 608 ALIGN_FUNCTION(); \ 609 __cpuidle_text_start = .; \ 610 *(.cpuidle.text) \ 611 __cpuidle_text_end = .; 612 613 #define KPROBES_TEXT \ 614 ALIGN_FUNCTION(); \ 615 __kprobes_text_start = .; \ 616 *(.kprobes.text) \ 617 __kprobes_text_end = .; 618 619 #define ENTRY_TEXT \ 620 ALIGN_FUNCTION(); \ 621 __entry_text_start = .; \ 622 *(.entry.text) \ 623 __entry_text_end = .; 624 625 #define IRQENTRY_TEXT \ 626 ALIGN_FUNCTION(); \ 627 __irqentry_text_start = .; \ 628 *(.irqentry.text) \ 629 __irqentry_text_end = .; 630 631 #define SOFTIRQENTRY_TEXT \ 632 ALIGN_FUNCTION(); \ 633 __softirqentry_text_start = .; \ 634 *(.softirqentry.text) \ 635 __softirqentry_text_end = .; 636 637 /* Section used for early init (in .S files) */ 638 #define HEAD_TEXT KEEP(*(.head.text)) 639 640 #define HEAD_TEXT_SECTION \ 641 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 642 HEAD_TEXT \ 643 } 644 645 /* 646 * Exception table 647 */ 648 #define EXCEPTION_TABLE(align) \ 649 . = ALIGN(align); \ 650 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 651 __start___ex_table = .; \ 652 KEEP(*(__ex_table)) \ 653 __stop___ex_table = .; \ 654 } 655 656 /* 657 * .BTF 658 */ 659 #ifdef CONFIG_DEBUG_INFO_BTF 660 #define BTF \ 661 .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \ 662 __start_BTF = .; \ 663 *(.BTF) \ 664 __stop_BTF = .; \ 665 } 666 #else 667 #define BTF 668 #endif 669 670 /* 671 * Init task 672 */ 673 #define INIT_TASK_DATA_SECTION(align) \ 674 . = ALIGN(align); \ 675 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 676 INIT_TASK_DATA(align) \ 677 } 678 679 #ifdef CONFIG_CONSTRUCTORS 680 #define KERNEL_CTORS() . = ALIGN(8); \ 681 __ctors_start = .; \ 682 KEEP(*(.ctors)) \ 683 KEEP(*(SORT(.init_array.*))) \ 684 KEEP(*(.init_array)) \ 685 __ctors_end = .; 686 #else 687 #define KERNEL_CTORS() 688 #endif 689 690 /* init and exit section handling */ 691 #define INIT_DATA \ 692 KEEP(*(SORT(___kentry+*))) \ 693 *(.init.data init.data.*) \ 694 MEM_DISCARD(init.data*) \ 695 KERNEL_CTORS() \ 696 MCOUNT_REC() \ 697 *(.init.rodata .init.rodata.*) \ 698 FTRACE_EVENTS() \ 699 TRACE_SYSCALLS() \ 700 KPROBE_BLACKLIST() \ 701 ERROR_INJECT_WHITELIST() \ 702 MEM_DISCARD(init.rodata) \ 703 CLK_OF_TABLES() \ 704 RESERVEDMEM_OF_TABLES() \ 705 TIMER_OF_TABLES() \ 706 CPU_METHOD_OF_TABLES() \ 707 CPUIDLE_METHOD_OF_TABLES() \ 708 KERNEL_DTB() \ 709 IRQCHIP_OF_MATCH_TABLE() \ 710 ACPI_PROBE_TABLE(irqchip) \ 711 ACPI_PROBE_TABLE(timer) \ 712 THERMAL_TABLE(governor) \ 713 EARLYCON_TABLE() \ 714 LSM_TABLE() \ 715 EARLY_LSM_TABLE() 716 717 #define INIT_TEXT \ 718 *(.init.text .init.text.*) \ 719 *(.text.startup) \ 720 MEM_DISCARD(init.text*) 721 722 #define EXIT_DATA \ 723 *(.exit.data .exit.data.*) \ 724 *(.fini_array .fini_array.*) \ 725 *(.dtors .dtors.*) \ 726 MEM_DISCARD(exit.data*) \ 727 MEM_DISCARD(exit.rodata*) 728 729 #define EXIT_TEXT \ 730 *(.exit.text) \ 731 *(.text.exit) \ 732 MEM_DISCARD(exit.text) 733 734 #define EXIT_CALL \ 735 *(.exitcall.exit) 736 737 /* 738 * bss (Block Started by Symbol) - uninitialized data 739 * zeroed during startup 740 */ 741 #define SBSS(sbss_align) \ 742 . = ALIGN(sbss_align); \ 743 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 744 *(.dynsbss) \ 745 *(SBSS_MAIN) \ 746 *(.scommon) \ 747 } 748 749 /* 750 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 751 * sections to the front of bss. 752 */ 753 #ifndef BSS_FIRST_SECTIONS 754 #define BSS_FIRST_SECTIONS 755 #endif 756 757 #define BSS(bss_align) \ 758 . = ALIGN(bss_align); \ 759 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 760 BSS_FIRST_SECTIONS \ 761 . = ALIGN(PAGE_SIZE); \ 762 *(.bss..page_aligned) \ 763 . = ALIGN(PAGE_SIZE); \ 764 *(.dynbss) \ 765 *(BSS_MAIN) \ 766 *(COMMON) \ 767 } 768 769 /* 770 * DWARF debug sections. 771 * Symbols in the DWARF debugging sections are relative to 772 * the beginning of the section so we begin them at 0. 773 */ 774 #define DWARF_DEBUG \ 775 /* DWARF 1 */ \ 776 .debug 0 : { *(.debug) } \ 777 .line 0 : { *(.line) } \ 778 /* GNU DWARF 1 extensions */ \ 779 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 780 .debug_sfnames 0 : { *(.debug_sfnames) } \ 781 /* DWARF 1.1 and DWARF 2 */ \ 782 .debug_aranges 0 : { *(.debug_aranges) } \ 783 .debug_pubnames 0 : { *(.debug_pubnames) } \ 784 /* DWARF 2 */ \ 785 .debug_info 0 : { *(.debug_info \ 786 .gnu.linkonce.wi.*) } \ 787 .debug_abbrev 0 : { *(.debug_abbrev) } \ 788 .debug_line 0 : { *(.debug_line) } \ 789 .debug_frame 0 : { *(.debug_frame) } \ 790 .debug_str 0 : { *(.debug_str) } \ 791 .debug_loc 0 : { *(.debug_loc) } \ 792 .debug_macinfo 0 : { *(.debug_macinfo) } \ 793 .debug_pubtypes 0 : { *(.debug_pubtypes) } \ 794 /* DWARF 3 */ \ 795 .debug_ranges 0 : { *(.debug_ranges) } \ 796 /* SGI/MIPS DWARF 2 extensions */ \ 797 .debug_weaknames 0 : { *(.debug_weaknames) } \ 798 .debug_funcnames 0 : { *(.debug_funcnames) } \ 799 .debug_typenames 0 : { *(.debug_typenames) } \ 800 .debug_varnames 0 : { *(.debug_varnames) } \ 801 /* GNU DWARF 2 extensions */ \ 802 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \ 803 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \ 804 /* DWARF 4 */ \ 805 .debug_types 0 : { *(.debug_types) } \ 806 /* DWARF 5 */ \ 807 .debug_macro 0 : { *(.debug_macro) } \ 808 .debug_addr 0 : { *(.debug_addr) } 809 810 /* Stabs debugging sections. */ 811 #define STABS_DEBUG \ 812 .stab 0 : { *(.stab) } \ 813 .stabstr 0 : { *(.stabstr) } \ 814 .stab.excl 0 : { *(.stab.excl) } \ 815 .stab.exclstr 0 : { *(.stab.exclstr) } \ 816 .stab.index 0 : { *(.stab.index) } \ 817 .stab.indexstr 0 : { *(.stab.indexstr) } \ 818 .comment 0 : { *(.comment) } 819 820 #ifdef CONFIG_GENERIC_BUG 821 #define BUG_TABLE \ 822 . = ALIGN(8); \ 823 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 824 __start___bug_table = .; \ 825 KEEP(*(__bug_table)) \ 826 __stop___bug_table = .; \ 827 } 828 #else 829 #define BUG_TABLE 830 #endif 831 832 #ifdef CONFIG_UNWINDER_ORC 833 #define ORC_UNWIND_TABLE \ 834 . = ALIGN(4); \ 835 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \ 836 __start_orc_unwind_ip = .; \ 837 KEEP(*(.orc_unwind_ip)) \ 838 __stop_orc_unwind_ip = .; \ 839 } \ 840 . = ALIGN(2); \ 841 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \ 842 __start_orc_unwind = .; \ 843 KEEP(*(.orc_unwind)) \ 844 __stop_orc_unwind = .; \ 845 } \ 846 . = ALIGN(4); \ 847 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \ 848 orc_lookup = .; \ 849 . += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) / \ 850 LOOKUP_BLOCK_SIZE) + 1) * 4; \ 851 orc_lookup_end = .; \ 852 } 853 #else 854 #define ORC_UNWIND_TABLE 855 #endif 856 857 #ifdef CONFIG_PM_TRACE 858 #define TRACEDATA \ 859 . = ALIGN(4); \ 860 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 861 __tracedata_start = .; \ 862 KEEP(*(.tracedata)) \ 863 __tracedata_end = .; \ 864 } 865 #else 866 #define TRACEDATA 867 #endif 868 869 #define NOTES \ 870 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 871 __start_notes = .; \ 872 KEEP(*(.note.*)) \ 873 __stop_notes = .; \ 874 } NOTES_HEADERS \ 875 NOTES_HEADERS_RESTORE 876 877 #define INIT_SETUP(initsetup_align) \ 878 . = ALIGN(initsetup_align); \ 879 __setup_start = .; \ 880 KEEP(*(.init.setup)) \ 881 __setup_end = .; 882 883 #define INIT_CALLS_LEVEL(level) \ 884 __initcall##level##_start = .; \ 885 KEEP(*(.initcall##level##.init)) \ 886 KEEP(*(.initcall##level##s.init)) \ 887 888 #define INIT_CALLS \ 889 __initcall_start = .; \ 890 KEEP(*(.initcallearly.init)) \ 891 INIT_CALLS_LEVEL(0) \ 892 INIT_CALLS_LEVEL(1) \ 893 INIT_CALLS_LEVEL(2) \ 894 INIT_CALLS_LEVEL(3) \ 895 INIT_CALLS_LEVEL(4) \ 896 INIT_CALLS_LEVEL(5) \ 897 INIT_CALLS_LEVEL(rootfs) \ 898 INIT_CALLS_LEVEL(6) \ 899 INIT_CALLS_LEVEL(7) \ 900 __initcall_end = .; 901 902 #define CON_INITCALL \ 903 __con_initcall_start = .; \ 904 KEEP(*(.con_initcall.init)) \ 905 __con_initcall_end = .; 906 907 #ifdef CONFIG_BLK_DEV_INITRD 908 #define INIT_RAM_FS \ 909 . = ALIGN(4); \ 910 __initramfs_start = .; \ 911 KEEP(*(.init.ramfs)) \ 912 . = ALIGN(8); \ 913 KEEP(*(.init.ramfs.info)) 914 #else 915 #define INIT_RAM_FS 916 #endif 917 918 /* 919 * Memory encryption operates on a page basis. Since we need to clear 920 * the memory encryption mask for this section, it needs to be aligned 921 * on a page boundary and be a page-size multiple in length. 922 * 923 * Note: We use a separate section so that only this section gets 924 * decrypted to avoid exposing more than we wish. 925 */ 926 #ifdef CONFIG_AMD_MEM_ENCRYPT 927 #define PERCPU_DECRYPTED_SECTION \ 928 . = ALIGN(PAGE_SIZE); \ 929 *(.data..percpu..decrypted) \ 930 . = ALIGN(PAGE_SIZE); 931 #else 932 #define PERCPU_DECRYPTED_SECTION 933 #endif 934 935 936 /* 937 * Default discarded sections. 938 * 939 * Some archs want to discard exit text/data at runtime rather than 940 * link time due to cross-section references such as alt instructions, 941 * bug table, eh_frame, etc. DISCARDS must be the last of output 942 * section definitions so that such archs put those in earlier section 943 * definitions. 944 */ 945 #ifdef RUNTIME_DISCARD_EXIT 946 #define EXIT_DISCARDS 947 #else 948 #define EXIT_DISCARDS \ 949 EXIT_TEXT \ 950 EXIT_DATA 951 #endif 952 953 #define DISCARDS \ 954 /DISCARD/ : { \ 955 EXIT_DISCARDS \ 956 EXIT_CALL \ 957 *(.discard) \ 958 *(.discard.*) \ 959 *(.modinfo) \ 960 } 961 962 /** 963 * PERCPU_INPUT - the percpu input sections 964 * @cacheline: cacheline size 965 * 966 * The core percpu section names and core symbols which do not rely 967 * directly upon load addresses. 968 * 969 * @cacheline is used to align subsections to avoid false cacheline 970 * sharing between subsections for different purposes. 971 */ 972 #define PERCPU_INPUT(cacheline) \ 973 __per_cpu_start = .; \ 974 *(.data..percpu..first) \ 975 . = ALIGN(PAGE_SIZE); \ 976 *(.data..percpu..page_aligned) \ 977 . = ALIGN(cacheline); \ 978 *(.data..percpu..read_mostly) \ 979 . = ALIGN(cacheline); \ 980 *(.data..percpu) \ 981 *(.data..percpu..shared_aligned) \ 982 PERCPU_DECRYPTED_SECTION \ 983 __per_cpu_end = .; 984 985 /** 986 * PERCPU_VADDR - define output section for percpu area 987 * @cacheline: cacheline size 988 * @vaddr: explicit base address (optional) 989 * @phdr: destination PHDR (optional) 990 * 991 * Macro which expands to output section for percpu area. 992 * 993 * @cacheline is used to align subsections to avoid false cacheline 994 * sharing between subsections for different purposes. 995 * 996 * If @vaddr is not blank, it specifies explicit base address and all 997 * percpu symbols will be offset from the given address. If blank, 998 * @vaddr always equals @laddr + LOAD_OFFSET. 999 * 1000 * @phdr defines the output PHDR to use if not blank. Be warned that 1001 * output PHDR is sticky. If @phdr is specified, the next output 1002 * section in the linker script will go there too. @phdr should have 1003 * a leading colon. 1004 * 1005 * Note that this macros defines __per_cpu_load as an absolute symbol. 1006 * If there is no need to put the percpu section at a predetermined 1007 * address, use PERCPU_SECTION. 1008 */ 1009 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 1010 __per_cpu_load = .; \ 1011 .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \ 1012 PERCPU_INPUT(cacheline) \ 1013 } phdr \ 1014 . = __per_cpu_load + SIZEOF(.data..percpu); 1015 1016 /** 1017 * PERCPU_SECTION - define output section for percpu area, simple version 1018 * @cacheline: cacheline size 1019 * 1020 * Align to PAGE_SIZE and outputs output section for percpu area. This 1021 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 1022 * __per_cpu_start will be identical. 1023 * 1024 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 1025 * except that __per_cpu_load is defined as a relative symbol against 1026 * .data..percpu which is required for relocatable x86_32 configuration. 1027 */ 1028 #define PERCPU_SECTION(cacheline) \ 1029 . = ALIGN(PAGE_SIZE); \ 1030 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 1031 __per_cpu_load = .; \ 1032 PERCPU_INPUT(cacheline) \ 1033 } 1034 1035 1036 /* 1037 * Definition of the high level *_SECTION macros 1038 * They will fit only a subset of the architectures 1039 */ 1040 1041 1042 /* 1043 * Writeable data. 1044 * All sections are combined in a single .data section. 1045 * The sections following CONSTRUCTORS are arranged so their 1046 * typical alignment matches. 1047 * A cacheline is typical/always less than a PAGE_SIZE so 1048 * the sections that has this restriction (or similar) 1049 * is located before the ones requiring PAGE_SIZE alignment. 1050 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 1051 * matches the requirement of PAGE_ALIGNED_DATA. 1052 * 1053 * use 0 as page_align if page_aligned data is not used */ 1054 #define RW_DATA(cacheline, pagealigned, inittask) \ 1055 . = ALIGN(PAGE_SIZE); \ 1056 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 1057 INIT_TASK_DATA(inittask) \ 1058 NOSAVE_DATA \ 1059 PAGE_ALIGNED_DATA(pagealigned) \ 1060 CACHELINE_ALIGNED_DATA(cacheline) \ 1061 READ_MOSTLY_DATA(cacheline) \ 1062 DATA_DATA \ 1063 CONSTRUCTORS \ 1064 } \ 1065 BUG_TABLE \ 1066 1067 #define INIT_TEXT_SECTION(inittext_align) \ 1068 . = ALIGN(inittext_align); \ 1069 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 1070 _sinittext = .; \ 1071 INIT_TEXT \ 1072 _einittext = .; \ 1073 } 1074 1075 #define INIT_DATA_SECTION(initsetup_align) \ 1076 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 1077 INIT_DATA \ 1078 INIT_SETUP(initsetup_align) \ 1079 INIT_CALLS \ 1080 CON_INITCALL \ 1081 INIT_RAM_FS \ 1082 } 1083 1084 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 1085 . = ALIGN(sbss_align); \ 1086 __bss_start = .; \ 1087 SBSS(sbss_align) \ 1088 BSS(bss_align) \ 1089 . = ALIGN(stop_align); \ 1090 __bss_stop = .; 1091