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 * ELF_DETAILS 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 /* 58 * Only some architectures want to have the .notes segment visible in 59 * a separate PT_NOTE ELF Program Header. When this happens, it needs 60 * to be visible in both the kernel text's PT_LOAD and the PT_NOTE 61 * Program Headers. In this case, though, the PT_LOAD needs to be made 62 * the default again so that all the following sections don't also end 63 * up in the PT_NOTE Program Header. 64 */ 65 #ifdef EMITS_PT_NOTE 66 #define NOTES_HEADERS :text :note 67 #define NOTES_HEADERS_RESTORE __restore_ph : { *(.__restore_ph) } :text 68 #else 69 #define NOTES_HEADERS 70 #define NOTES_HEADERS_RESTORE 71 #endif 72 73 /* 74 * Some architectures have non-executable read-only exception tables. 75 * They can be added to the RO_DATA segment by specifying their desired 76 * alignment. 77 */ 78 #ifdef RO_EXCEPTION_TABLE_ALIGN 79 #define RO_EXCEPTION_TABLE EXCEPTION_TABLE(RO_EXCEPTION_TABLE_ALIGN) 80 #else 81 #define RO_EXCEPTION_TABLE 82 #endif 83 84 /* Align . to a 8 byte boundary equals to maximum function alignment. */ 85 #define ALIGN_FUNCTION() . = ALIGN(8) 86 87 /* 88 * LD_DEAD_CODE_DATA_ELIMINATION option enables -fdata-sections, which 89 * generates .data.identifier sections, which need to be pulled in with 90 * .data. We don't want to pull in .data..other sections, which Linux 91 * has defined. Same for text and bss. 92 * 93 * With LTO_CLANG, the linker also splits sections by default, so we need 94 * these macros to combine the sections during the final link. 95 * 96 * RODATA_MAIN is not used because existing code already defines .rodata.x 97 * sections to be brought in with rodata. 98 */ 99 #if defined(CONFIG_LD_DEAD_CODE_DATA_ELIMINATION) || defined(CONFIG_LTO_CLANG) 100 #define TEXT_MAIN .text .text.[0-9a-zA-Z_]* 101 #define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..L* .data..compoundliteral* .data.$__unnamed_* .data.$L* 102 #define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]* 103 #define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]* .rodata..L* 104 #define BSS_MAIN .bss .bss.[0-9a-zA-Z_]* .bss..compoundliteral* 105 #define SBSS_MAIN .sbss .sbss.[0-9a-zA-Z_]* 106 #else 107 #define TEXT_MAIN .text 108 #define DATA_MAIN .data 109 #define SDATA_MAIN .sdata 110 #define RODATA_MAIN .rodata 111 #define BSS_MAIN .bss 112 #define SBSS_MAIN .sbss 113 #endif 114 115 /* 116 * GCC 4.5 and later have a 32 bytes section alignment for structures. 117 * Except GCC 4.9, that feels the need to align on 64 bytes. 118 */ 119 #define STRUCT_ALIGNMENT 32 120 #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 * ftrace_ops_list_func will be defined as arch_ftrace_ops_list_func 169 * as some archs will have a different prototype for that function 170 * but ftrace_ops_list_func() will have a single prototype. 171 */ 172 #define MCOUNT_REC() . = ALIGN(8); \ 173 __start_mcount_loc = .; \ 174 KEEP(*(__mcount_loc)) \ 175 KEEP(*(__patchable_function_entries)) \ 176 __stop_mcount_loc = .; \ 177 ftrace_stub_graph = ftrace_stub; \ 178 ftrace_ops_list_func = arch_ftrace_ops_list_func; 179 #else 180 # ifdef CONFIG_FUNCTION_TRACER 181 # define MCOUNT_REC() ftrace_stub_graph = ftrace_stub; \ 182 ftrace_ops_list_func = arch_ftrace_ops_list_func; 183 # else 184 # define MCOUNT_REC() 185 # endif 186 #endif 187 188 #ifdef CONFIG_TRACE_BRANCH_PROFILING 189 #define LIKELY_PROFILE() __start_annotated_branch_profile = .; \ 190 KEEP(*(_ftrace_annotated_branch)) \ 191 __stop_annotated_branch_profile = .; 192 #else 193 #define LIKELY_PROFILE() 194 #endif 195 196 #ifdef CONFIG_PROFILE_ALL_BRANCHES 197 #define BRANCH_PROFILE() __start_branch_profile = .; \ 198 KEEP(*(_ftrace_branch)) \ 199 __stop_branch_profile = .; 200 #else 201 #define BRANCH_PROFILE() 202 #endif 203 204 #ifdef CONFIG_KPROBES 205 #define KPROBE_BLACKLIST() . = ALIGN(8); \ 206 __start_kprobe_blacklist = .; \ 207 KEEP(*(_kprobe_blacklist)) \ 208 __stop_kprobe_blacklist = .; 209 #else 210 #define KPROBE_BLACKLIST() 211 #endif 212 213 #ifdef CONFIG_FUNCTION_ERROR_INJECTION 214 #define ERROR_INJECT_WHITELIST() STRUCT_ALIGN(); \ 215 __start_error_injection_whitelist = .; \ 216 KEEP(*(_error_injection_whitelist)) \ 217 __stop_error_injection_whitelist = .; 218 #else 219 #define ERROR_INJECT_WHITELIST() 220 #endif 221 222 #ifdef CONFIG_EVENT_TRACING 223 #define FTRACE_EVENTS() . = ALIGN(8); \ 224 __start_ftrace_events = .; \ 225 KEEP(*(_ftrace_events)) \ 226 __stop_ftrace_events = .; \ 227 __start_ftrace_eval_maps = .; \ 228 KEEP(*(_ftrace_eval_map)) \ 229 __stop_ftrace_eval_maps = .; 230 #else 231 #define FTRACE_EVENTS() 232 #endif 233 234 #ifdef CONFIG_TRACING 235 #define TRACE_PRINTKS() __start___trace_bprintk_fmt = .; \ 236 KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \ 237 __stop___trace_bprintk_fmt = .; 238 #define TRACEPOINT_STR() __start___tracepoint_str = .; \ 239 KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \ 240 __stop___tracepoint_str = .; 241 #else 242 #define TRACE_PRINTKS() 243 #define TRACEPOINT_STR() 244 #endif 245 246 #ifdef CONFIG_FTRACE_SYSCALLS 247 #define TRACE_SYSCALLS() . = ALIGN(8); \ 248 __start_syscalls_metadata = .; \ 249 KEEP(*(__syscalls_metadata)) \ 250 __stop_syscalls_metadata = .; 251 #else 252 #define TRACE_SYSCALLS() 253 #endif 254 255 #ifdef CONFIG_BPF_EVENTS 256 #define BPF_RAW_TP() STRUCT_ALIGN(); \ 257 __start__bpf_raw_tp = .; \ 258 KEEP(*(__bpf_raw_tp_map)) \ 259 __stop__bpf_raw_tp = .; 260 #else 261 #define BPF_RAW_TP() 262 #endif 263 264 #ifdef CONFIG_SERIAL_EARLYCON 265 #define EARLYCON_TABLE() . = ALIGN(8); \ 266 __earlycon_table = .; \ 267 KEEP(*(__earlycon_table)) \ 268 __earlycon_table_end = .; 269 #else 270 #define EARLYCON_TABLE() 271 #endif 272 273 #ifdef CONFIG_SECURITY 274 #define LSM_TABLE() . = ALIGN(8); \ 275 __start_lsm_info = .; \ 276 KEEP(*(.lsm_info.init)) \ 277 __end_lsm_info = .; 278 #define EARLY_LSM_TABLE() . = ALIGN(8); \ 279 __start_early_lsm_info = .; \ 280 KEEP(*(.early_lsm_info.init)) \ 281 __end_early_lsm_info = .; 282 #else 283 #define LSM_TABLE() 284 #define EARLY_LSM_TABLE() 285 #endif 286 287 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name) 288 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name) 289 #define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name) 290 #define _OF_TABLE_0(name) 291 #define _OF_TABLE_1(name) \ 292 . = ALIGN(8); \ 293 __##name##_of_table = .; \ 294 KEEP(*(__##name##_of_table)) \ 295 KEEP(*(__##name##_of_table_end)) 296 297 #define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer) 298 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip) 299 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk) 300 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem) 301 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method) 302 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method) 303 304 #ifdef CONFIG_ACPI 305 #define ACPI_PROBE_TABLE(name) \ 306 . = ALIGN(8); \ 307 __##name##_acpi_probe_table = .; \ 308 KEEP(*(__##name##_acpi_probe_table)) \ 309 __##name##_acpi_probe_table_end = .; 310 #else 311 #define ACPI_PROBE_TABLE(name) 312 #endif 313 314 #ifdef CONFIG_THERMAL 315 #define THERMAL_TABLE(name) \ 316 . = ALIGN(8); \ 317 __##name##_thermal_table = .; \ 318 KEEP(*(__##name##_thermal_table)) \ 319 __##name##_thermal_table_end = .; 320 #else 321 #define THERMAL_TABLE(name) 322 #endif 323 324 #ifdef CONFIG_DTPM 325 #define DTPM_TABLE() \ 326 . = ALIGN(8); \ 327 __dtpm_table = .; \ 328 KEEP(*(__dtpm_table)) \ 329 __dtpm_table_end = .; 330 #else 331 #define DTPM_TABLE() 332 #endif 333 334 #define KERNEL_DTB() \ 335 STRUCT_ALIGN(); \ 336 __dtb_start = .; \ 337 KEEP(*(.dtb.init.rodata)) \ 338 __dtb_end = .; 339 340 /* 341 * .data section 342 */ 343 #define DATA_DATA \ 344 *(.xiptext) \ 345 *(DATA_MAIN) \ 346 *(.ref.data) \ 347 *(.data..shared_aligned) /* percpu related */ \ 348 MEM_KEEP(init.data*) \ 349 MEM_KEEP(exit.data*) \ 350 *(.data.unlikely) \ 351 __start_once = .; \ 352 *(.data.once) \ 353 __end_once = .; \ 354 STRUCT_ALIGN(); \ 355 *(__tracepoints) \ 356 /* implement dynamic printk debug */ \ 357 . = ALIGN(8); \ 358 __start___dyndbg = .; \ 359 KEEP(*(__dyndbg)) \ 360 __stop___dyndbg = .; \ 361 LIKELY_PROFILE() \ 362 BRANCH_PROFILE() \ 363 TRACE_PRINTKS() \ 364 BPF_RAW_TP() \ 365 TRACEPOINT_STR() 366 367 /* 368 * Data section helpers 369 */ 370 #define NOSAVE_DATA \ 371 . = ALIGN(PAGE_SIZE); \ 372 __nosave_begin = .; \ 373 *(.data..nosave) \ 374 . = ALIGN(PAGE_SIZE); \ 375 __nosave_end = .; 376 377 #define PAGE_ALIGNED_DATA(page_align) \ 378 . = ALIGN(page_align); \ 379 *(.data..page_aligned) \ 380 . = ALIGN(page_align); 381 382 #define READ_MOSTLY_DATA(align) \ 383 . = ALIGN(align); \ 384 *(.data..read_mostly) \ 385 . = ALIGN(align); 386 387 #define CACHELINE_ALIGNED_DATA(align) \ 388 . = ALIGN(align); \ 389 *(.data..cacheline_aligned) 390 391 #define INIT_TASK_DATA(align) \ 392 . = ALIGN(align); \ 393 __start_init_task = .; \ 394 init_thread_union = .; \ 395 init_stack = .; \ 396 KEEP(*(.data..init_task)) \ 397 KEEP(*(.data..init_thread_info)) \ 398 . = __start_init_task + THREAD_SIZE; \ 399 __end_init_task = .; 400 401 #define JUMP_TABLE_DATA \ 402 . = ALIGN(8); \ 403 __start___jump_table = .; \ 404 KEEP(*(__jump_table)) \ 405 __stop___jump_table = .; 406 407 #ifdef CONFIG_HAVE_STATIC_CALL_INLINE 408 #define STATIC_CALL_DATA \ 409 . = ALIGN(8); \ 410 __start_static_call_sites = .; \ 411 KEEP(*(.static_call_sites)) \ 412 __stop_static_call_sites = .; \ 413 __start_static_call_tramp_key = .; \ 414 KEEP(*(.static_call_tramp_key)) \ 415 __stop_static_call_tramp_key = .; 416 #else 417 #define STATIC_CALL_DATA 418 #endif 419 420 /* 421 * Allow architectures to handle ro_after_init data on their 422 * own by defining an empty RO_AFTER_INIT_DATA. 423 */ 424 #ifndef RO_AFTER_INIT_DATA 425 #define RO_AFTER_INIT_DATA \ 426 . = ALIGN(8); \ 427 __start_ro_after_init = .; \ 428 *(.data..ro_after_init) \ 429 JUMP_TABLE_DATA \ 430 STATIC_CALL_DATA \ 431 __end_ro_after_init = .; 432 #endif 433 434 /* 435 * Read only Data 436 */ 437 #define RO_DATA(align) \ 438 . = ALIGN((align)); \ 439 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 440 __start_rodata = .; \ 441 *(.rodata) *(.rodata.*) \ 442 SCHED_DATA \ 443 RO_AFTER_INIT_DATA /* Read only after init */ \ 444 . = ALIGN(8); \ 445 __start___tracepoints_ptrs = .; \ 446 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \ 447 __stop___tracepoints_ptrs = .; \ 448 *(__tracepoints_strings)/* Tracepoints: strings */ \ 449 } \ 450 \ 451 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 452 *(.rodata1) \ 453 } \ 454 \ 455 /* PCI quirks */ \ 456 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 457 __start_pci_fixups_early = .; \ 458 KEEP(*(.pci_fixup_early)) \ 459 __end_pci_fixups_early = .; \ 460 __start_pci_fixups_header = .; \ 461 KEEP(*(.pci_fixup_header)) \ 462 __end_pci_fixups_header = .; \ 463 __start_pci_fixups_final = .; \ 464 KEEP(*(.pci_fixup_final)) \ 465 __end_pci_fixups_final = .; \ 466 __start_pci_fixups_enable = .; \ 467 KEEP(*(.pci_fixup_enable)) \ 468 __end_pci_fixups_enable = .; \ 469 __start_pci_fixups_resume = .; \ 470 KEEP(*(.pci_fixup_resume)) \ 471 __end_pci_fixups_resume = .; \ 472 __start_pci_fixups_resume_early = .; \ 473 KEEP(*(.pci_fixup_resume_early)) \ 474 __end_pci_fixups_resume_early = .; \ 475 __start_pci_fixups_suspend = .; \ 476 KEEP(*(.pci_fixup_suspend)) \ 477 __end_pci_fixups_suspend = .; \ 478 __start_pci_fixups_suspend_late = .; \ 479 KEEP(*(.pci_fixup_suspend_late)) \ 480 __end_pci_fixups_suspend_late = .; \ 481 } \ 482 \ 483 FW_LOADER_BUILT_IN_DATA \ 484 TRACEDATA \ 485 \ 486 PRINTK_INDEX \ 487 \ 488 /* Kernel symbol table: Normal symbols */ \ 489 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 490 __start___ksymtab = .; \ 491 KEEP(*(SORT(___ksymtab+*))) \ 492 __stop___ksymtab = .; \ 493 } \ 494 \ 495 /* Kernel symbol table: GPL-only symbols */ \ 496 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 497 __start___ksymtab_gpl = .; \ 498 KEEP(*(SORT(___ksymtab_gpl+*))) \ 499 __stop___ksymtab_gpl = .; \ 500 } \ 501 \ 502 /* Kernel symbol table: Normal symbols */ \ 503 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 504 __start___kcrctab = .; \ 505 KEEP(*(SORT(___kcrctab+*))) \ 506 __stop___kcrctab = .; \ 507 } \ 508 \ 509 /* Kernel symbol table: GPL-only symbols */ \ 510 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 511 __start___kcrctab_gpl = .; \ 512 KEEP(*(SORT(___kcrctab_gpl+*))) \ 513 __stop___kcrctab_gpl = .; \ 514 } \ 515 \ 516 /* Kernel symbol table: strings */ \ 517 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 518 *(__ksymtab_strings) \ 519 } \ 520 \ 521 /* __*init sections */ \ 522 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 523 *(.ref.rodata) \ 524 MEM_KEEP(init.rodata) \ 525 MEM_KEEP(exit.rodata) \ 526 } \ 527 \ 528 /* Built-in module parameters. */ \ 529 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 530 __start___param = .; \ 531 KEEP(*(__param)) \ 532 __stop___param = .; \ 533 } \ 534 \ 535 /* Built-in module versions. */ \ 536 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 537 __start___modver = .; \ 538 KEEP(*(__modver)) \ 539 __stop___modver = .; \ 540 } \ 541 \ 542 RO_EXCEPTION_TABLE \ 543 NOTES \ 544 BTF \ 545 \ 546 . = ALIGN((align)); \ 547 __end_rodata = .; 548 549 550 /* 551 * .text..L.cfi.jumptable.* contain Control-Flow Integrity (CFI) 552 * jump table entries. 553 */ 554 #ifdef CONFIG_CFI_CLANG 555 #define TEXT_CFI_JT \ 556 . = ALIGN(PMD_SIZE); \ 557 __cfi_jt_start = .; \ 558 *(.text..L.cfi.jumptable .text..L.cfi.jumptable.*) \ 559 . = ALIGN(PMD_SIZE); \ 560 __cfi_jt_end = .; 561 #else 562 #define TEXT_CFI_JT 563 #endif 564 565 /* 566 * Non-instrumentable text section 567 */ 568 #define NOINSTR_TEXT \ 569 ALIGN_FUNCTION(); \ 570 __noinstr_text_start = .; \ 571 *(.noinstr.text) \ 572 __noinstr_text_end = .; 573 574 /* 575 * .text section. Map to function alignment to avoid address changes 576 * during second ld run in second ld pass when generating System.map 577 * 578 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead 579 * code elimination is enabled, so these sections should be converted 580 * to use ".." first. 581 */ 582 #define TEXT_TEXT \ 583 ALIGN_FUNCTION(); \ 584 *(.text.hot .text.hot.*) \ 585 *(TEXT_MAIN .text.fixup) \ 586 *(.text.unlikely .text.unlikely.*) \ 587 *(.text.unknown .text.unknown.*) \ 588 NOINSTR_TEXT \ 589 *(.text..refcount) \ 590 *(.ref.text) \ 591 *(.text.asan.* .text.tsan.*) \ 592 TEXT_CFI_JT \ 593 MEM_KEEP(init.text*) \ 594 MEM_KEEP(exit.text*) \ 595 596 597 /* sched.text is aling to function alignment to secure we have same 598 * address even at second ld pass when generating System.map */ 599 #define SCHED_TEXT \ 600 ALIGN_FUNCTION(); \ 601 __sched_text_start = .; \ 602 *(.sched.text) \ 603 __sched_text_end = .; 604 605 /* spinlock.text is aling to function alignment to secure we have same 606 * address even at second ld pass when generating System.map */ 607 #define LOCK_TEXT \ 608 ALIGN_FUNCTION(); \ 609 __lock_text_start = .; \ 610 *(.spinlock.text) \ 611 __lock_text_end = .; 612 613 #define CPUIDLE_TEXT \ 614 ALIGN_FUNCTION(); \ 615 __cpuidle_text_start = .; \ 616 *(.cpuidle.text) \ 617 __cpuidle_text_end = .; 618 619 #define KPROBES_TEXT \ 620 ALIGN_FUNCTION(); \ 621 __kprobes_text_start = .; \ 622 *(.kprobes.text) \ 623 __kprobes_text_end = .; 624 625 #define ENTRY_TEXT \ 626 ALIGN_FUNCTION(); \ 627 __entry_text_start = .; \ 628 *(.entry.text) \ 629 __entry_text_end = .; 630 631 #define IRQENTRY_TEXT \ 632 ALIGN_FUNCTION(); \ 633 __irqentry_text_start = .; \ 634 *(.irqentry.text) \ 635 __irqentry_text_end = .; 636 637 #define SOFTIRQENTRY_TEXT \ 638 ALIGN_FUNCTION(); \ 639 __softirqentry_text_start = .; \ 640 *(.softirqentry.text) \ 641 __softirqentry_text_end = .; 642 643 #define STATIC_CALL_TEXT \ 644 ALIGN_FUNCTION(); \ 645 __static_call_text_start = .; \ 646 *(.static_call.text) \ 647 __static_call_text_end = .; 648 649 /* Section used for early init (in .S files) */ 650 #define HEAD_TEXT KEEP(*(.head.text)) 651 652 #define HEAD_TEXT_SECTION \ 653 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 654 HEAD_TEXT \ 655 } 656 657 /* 658 * Exception table 659 */ 660 #define EXCEPTION_TABLE(align) \ 661 . = ALIGN(align); \ 662 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 663 __start___ex_table = .; \ 664 KEEP(*(__ex_table)) \ 665 __stop___ex_table = .; \ 666 } 667 668 /* 669 * .BTF 670 */ 671 #ifdef CONFIG_DEBUG_INFO_BTF 672 #define BTF \ 673 .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \ 674 __start_BTF = .; \ 675 KEEP(*(.BTF)) \ 676 __stop_BTF = .; \ 677 } \ 678 . = ALIGN(4); \ 679 .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) { \ 680 *(.BTF_ids) \ 681 } 682 #else 683 #define BTF 684 #endif 685 686 /* 687 * Init task 688 */ 689 #define INIT_TASK_DATA_SECTION(align) \ 690 . = ALIGN(align); \ 691 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 692 INIT_TASK_DATA(align) \ 693 } 694 695 #ifdef CONFIG_CONSTRUCTORS 696 #define KERNEL_CTORS() . = ALIGN(8); \ 697 __ctors_start = .; \ 698 KEEP(*(SORT(.ctors.*))) \ 699 KEEP(*(.ctors)) \ 700 KEEP(*(SORT(.init_array.*))) \ 701 KEEP(*(.init_array)) \ 702 __ctors_end = .; 703 #else 704 #define KERNEL_CTORS() 705 #endif 706 707 /* init and exit section handling */ 708 #define INIT_DATA \ 709 KEEP(*(SORT(___kentry+*))) \ 710 *(.init.data init.data.*) \ 711 MEM_DISCARD(init.data*) \ 712 KERNEL_CTORS() \ 713 MCOUNT_REC() \ 714 *(.init.rodata .init.rodata.*) \ 715 FTRACE_EVENTS() \ 716 TRACE_SYSCALLS() \ 717 KPROBE_BLACKLIST() \ 718 ERROR_INJECT_WHITELIST() \ 719 MEM_DISCARD(init.rodata) \ 720 CLK_OF_TABLES() \ 721 RESERVEDMEM_OF_TABLES() \ 722 TIMER_OF_TABLES() \ 723 CPU_METHOD_OF_TABLES() \ 724 CPUIDLE_METHOD_OF_TABLES() \ 725 KERNEL_DTB() \ 726 IRQCHIP_OF_MATCH_TABLE() \ 727 ACPI_PROBE_TABLE(irqchip) \ 728 ACPI_PROBE_TABLE(timer) \ 729 THERMAL_TABLE(governor) \ 730 DTPM_TABLE() \ 731 EARLYCON_TABLE() \ 732 LSM_TABLE() \ 733 EARLY_LSM_TABLE() \ 734 KUNIT_TABLE() 735 736 #define INIT_TEXT \ 737 *(.init.text .init.text.*) \ 738 *(.text.startup) \ 739 MEM_DISCARD(init.text*) 740 741 #define EXIT_DATA \ 742 *(.exit.data .exit.data.*) \ 743 *(.fini_array .fini_array.*) \ 744 *(.dtors .dtors.*) \ 745 MEM_DISCARD(exit.data*) \ 746 MEM_DISCARD(exit.rodata*) 747 748 #define EXIT_TEXT \ 749 *(.exit.text) \ 750 *(.text.exit) \ 751 MEM_DISCARD(exit.text) 752 753 #define EXIT_CALL \ 754 *(.exitcall.exit) 755 756 /* 757 * bss (Block Started by Symbol) - uninitialized data 758 * zeroed during startup 759 */ 760 #define SBSS(sbss_align) \ 761 . = ALIGN(sbss_align); \ 762 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 763 *(.dynsbss) \ 764 *(SBSS_MAIN) \ 765 *(.scommon) \ 766 } 767 768 /* 769 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 770 * sections to the front of bss. 771 */ 772 #ifndef BSS_FIRST_SECTIONS 773 #define BSS_FIRST_SECTIONS 774 #endif 775 776 #define BSS(bss_align) \ 777 . = ALIGN(bss_align); \ 778 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 779 BSS_FIRST_SECTIONS \ 780 . = ALIGN(PAGE_SIZE); \ 781 *(.bss..page_aligned) \ 782 . = ALIGN(PAGE_SIZE); \ 783 *(.dynbss) \ 784 *(BSS_MAIN) \ 785 *(COMMON) \ 786 } 787 788 /* 789 * DWARF debug sections. 790 * Symbols in the DWARF debugging sections are relative to 791 * the beginning of the section so we begin them at 0. 792 */ 793 #define DWARF_DEBUG \ 794 /* DWARF 1 */ \ 795 .debug 0 : { *(.debug) } \ 796 .line 0 : { *(.line) } \ 797 /* GNU DWARF 1 extensions */ \ 798 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 799 .debug_sfnames 0 : { *(.debug_sfnames) } \ 800 /* DWARF 1.1 and DWARF 2 */ \ 801 .debug_aranges 0 : { *(.debug_aranges) } \ 802 .debug_pubnames 0 : { *(.debug_pubnames) } \ 803 /* DWARF 2 */ \ 804 .debug_info 0 : { *(.debug_info \ 805 .gnu.linkonce.wi.*) } \ 806 .debug_abbrev 0 : { *(.debug_abbrev) } \ 807 .debug_line 0 : { *(.debug_line) } \ 808 .debug_frame 0 : { *(.debug_frame) } \ 809 .debug_str 0 : { *(.debug_str) } \ 810 .debug_loc 0 : { *(.debug_loc) } \ 811 .debug_macinfo 0 : { *(.debug_macinfo) } \ 812 .debug_pubtypes 0 : { *(.debug_pubtypes) } \ 813 /* DWARF 3 */ \ 814 .debug_ranges 0 : { *(.debug_ranges) } \ 815 /* SGI/MIPS DWARF 2 extensions */ \ 816 .debug_weaknames 0 : { *(.debug_weaknames) } \ 817 .debug_funcnames 0 : { *(.debug_funcnames) } \ 818 .debug_typenames 0 : { *(.debug_typenames) } \ 819 .debug_varnames 0 : { *(.debug_varnames) } \ 820 /* GNU DWARF 2 extensions */ \ 821 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \ 822 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \ 823 /* DWARF 4 */ \ 824 .debug_types 0 : { *(.debug_types) } \ 825 /* DWARF 5 */ \ 826 .debug_addr 0 : { *(.debug_addr) } \ 827 .debug_line_str 0 : { *(.debug_line_str) } \ 828 .debug_loclists 0 : { *(.debug_loclists) } \ 829 .debug_macro 0 : { *(.debug_macro) } \ 830 .debug_names 0 : { *(.debug_names) } \ 831 .debug_rnglists 0 : { *(.debug_rnglists) } \ 832 .debug_str_offsets 0 : { *(.debug_str_offsets) } 833 834 /* Stabs debugging sections. */ 835 #define STABS_DEBUG \ 836 .stab 0 : { *(.stab) } \ 837 .stabstr 0 : { *(.stabstr) } \ 838 .stab.excl 0 : { *(.stab.excl) } \ 839 .stab.exclstr 0 : { *(.stab.exclstr) } \ 840 .stab.index 0 : { *(.stab.index) } \ 841 .stab.indexstr 0 : { *(.stab.indexstr) } 842 843 /* Required sections not related to debugging. */ 844 #define ELF_DETAILS \ 845 .comment 0 : { *(.comment) } \ 846 .symtab 0 : { *(.symtab) } \ 847 .strtab 0 : { *(.strtab) } \ 848 .shstrtab 0 : { *(.shstrtab) } 849 850 #ifdef CONFIG_GENERIC_BUG 851 #define BUG_TABLE \ 852 . = ALIGN(8); \ 853 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 854 __start___bug_table = .; \ 855 KEEP(*(__bug_table)) \ 856 __stop___bug_table = .; \ 857 } 858 #else 859 #define BUG_TABLE 860 #endif 861 862 #ifdef CONFIG_UNWINDER_ORC 863 #define ORC_UNWIND_TABLE \ 864 . = ALIGN(4); \ 865 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \ 866 __start_orc_unwind_ip = .; \ 867 KEEP(*(.orc_unwind_ip)) \ 868 __stop_orc_unwind_ip = .; \ 869 } \ 870 . = ALIGN(2); \ 871 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \ 872 __start_orc_unwind = .; \ 873 KEEP(*(.orc_unwind)) \ 874 __stop_orc_unwind = .; \ 875 } \ 876 text_size = _etext - _stext; \ 877 . = ALIGN(4); \ 878 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \ 879 orc_lookup = .; \ 880 . += (((text_size + LOOKUP_BLOCK_SIZE - 1) / \ 881 LOOKUP_BLOCK_SIZE) + 1) * 4; \ 882 orc_lookup_end = .; \ 883 } 884 #else 885 #define ORC_UNWIND_TABLE 886 #endif 887 888 /* Built-in firmware blobs */ 889 #ifdef CONFIG_FW_LOADER 890 #define FW_LOADER_BUILT_IN_DATA \ 891 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) { \ 892 __start_builtin_fw = .; \ 893 KEEP(*(.builtin_fw)) \ 894 __end_builtin_fw = .; \ 895 } 896 #else 897 #define FW_LOADER_BUILT_IN_DATA 898 #endif 899 900 #ifdef CONFIG_PM_TRACE 901 #define TRACEDATA \ 902 . = ALIGN(4); \ 903 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 904 __tracedata_start = .; \ 905 KEEP(*(.tracedata)) \ 906 __tracedata_end = .; \ 907 } 908 #else 909 #define TRACEDATA 910 #endif 911 912 #ifdef CONFIG_PRINTK_INDEX 913 #define PRINTK_INDEX \ 914 .printk_index : AT(ADDR(.printk_index) - LOAD_OFFSET) { \ 915 __start_printk_index = .; \ 916 *(.printk_index) \ 917 __stop_printk_index = .; \ 918 } 919 #else 920 #define PRINTK_INDEX 921 #endif 922 923 #define NOTES \ 924 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 925 __start_notes = .; \ 926 KEEP(*(.note.*)) \ 927 __stop_notes = .; \ 928 } NOTES_HEADERS \ 929 NOTES_HEADERS_RESTORE 930 931 #define INIT_SETUP(initsetup_align) \ 932 . = ALIGN(initsetup_align); \ 933 __setup_start = .; \ 934 KEEP(*(.init.setup)) \ 935 __setup_end = .; 936 937 #define INIT_CALLS_LEVEL(level) \ 938 __initcall##level##_start = .; \ 939 KEEP(*(.initcall##level##.init)) \ 940 KEEP(*(.initcall##level##s.init)) \ 941 942 #define INIT_CALLS \ 943 __initcall_start = .; \ 944 KEEP(*(.initcallearly.init)) \ 945 INIT_CALLS_LEVEL(0) \ 946 INIT_CALLS_LEVEL(1) \ 947 INIT_CALLS_LEVEL(2) \ 948 INIT_CALLS_LEVEL(3) \ 949 INIT_CALLS_LEVEL(4) \ 950 INIT_CALLS_LEVEL(5) \ 951 INIT_CALLS_LEVEL(rootfs) \ 952 INIT_CALLS_LEVEL(6) \ 953 INIT_CALLS_LEVEL(7) \ 954 __initcall_end = .; 955 956 #define CON_INITCALL \ 957 __con_initcall_start = .; \ 958 KEEP(*(.con_initcall.init)) \ 959 __con_initcall_end = .; 960 961 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */ 962 #define KUNIT_TABLE() \ 963 . = ALIGN(8); \ 964 __kunit_suites_start = .; \ 965 KEEP(*(.kunit_test_suites)) \ 966 __kunit_suites_end = .; 967 968 #ifdef CONFIG_BLK_DEV_INITRD 969 #define INIT_RAM_FS \ 970 . = ALIGN(4); \ 971 __initramfs_start = .; \ 972 KEEP(*(.init.ramfs)) \ 973 . = ALIGN(8); \ 974 KEEP(*(.init.ramfs.info)) 975 #else 976 #define INIT_RAM_FS 977 #endif 978 979 /* 980 * Memory encryption operates on a page basis. Since we need to clear 981 * the memory encryption mask for this section, it needs to be aligned 982 * on a page boundary and be a page-size multiple in length. 983 * 984 * Note: We use a separate section so that only this section gets 985 * decrypted to avoid exposing more than we wish. 986 */ 987 #ifdef CONFIG_AMD_MEM_ENCRYPT 988 #define PERCPU_DECRYPTED_SECTION \ 989 . = ALIGN(PAGE_SIZE); \ 990 *(.data..decrypted) \ 991 *(.data..percpu..decrypted) \ 992 . = ALIGN(PAGE_SIZE); 993 #else 994 #define PERCPU_DECRYPTED_SECTION 995 #endif 996 997 998 /* 999 * Default discarded sections. 1000 * 1001 * Some archs want to discard exit text/data at runtime rather than 1002 * link time due to cross-section references such as alt instructions, 1003 * bug table, eh_frame, etc. DISCARDS must be the last of output 1004 * section definitions so that such archs put those in earlier section 1005 * definitions. 1006 */ 1007 #ifdef RUNTIME_DISCARD_EXIT 1008 #define EXIT_DISCARDS 1009 #else 1010 #define EXIT_DISCARDS \ 1011 EXIT_TEXT \ 1012 EXIT_DATA 1013 #endif 1014 1015 /* 1016 * Clang's -fprofile-arcs, -fsanitize=kernel-address, and 1017 * -fsanitize=thread produce unwanted sections (.eh_frame 1018 * and .init_array.*), but CONFIG_CONSTRUCTORS wants to 1019 * keep any .init_array.* sections. 1020 * https://bugs.llvm.org/show_bug.cgi?id=46478 1021 */ 1022 #if defined(CONFIG_GCOV_KERNEL) || defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN) || \ 1023 defined(CONFIG_CFI_CLANG) 1024 # ifdef CONFIG_CONSTRUCTORS 1025 # define SANITIZER_DISCARDS \ 1026 *(.eh_frame) 1027 # else 1028 # define SANITIZER_DISCARDS \ 1029 *(.init_array) *(.init_array.*) \ 1030 *(.eh_frame) 1031 # endif 1032 #else 1033 # define SANITIZER_DISCARDS 1034 #endif 1035 1036 #define COMMON_DISCARDS \ 1037 SANITIZER_DISCARDS \ 1038 *(.discard) \ 1039 *(.discard.*) \ 1040 *(.modinfo) \ 1041 /* ld.bfd warns about .gnu.version* even when not emitted */ \ 1042 *(.gnu.version*) \ 1043 1044 #define DISCARDS \ 1045 /DISCARD/ : { \ 1046 EXIT_DISCARDS \ 1047 EXIT_CALL \ 1048 COMMON_DISCARDS \ 1049 } 1050 1051 /** 1052 * PERCPU_INPUT - the percpu input sections 1053 * @cacheline: cacheline size 1054 * 1055 * The core percpu section names and core symbols which do not rely 1056 * directly upon load addresses. 1057 * 1058 * @cacheline is used to align subsections to avoid false cacheline 1059 * sharing between subsections for different purposes. 1060 */ 1061 #define PERCPU_INPUT(cacheline) \ 1062 __per_cpu_start = .; \ 1063 *(.data..percpu..first) \ 1064 . = ALIGN(PAGE_SIZE); \ 1065 *(.data..percpu..page_aligned) \ 1066 . = ALIGN(cacheline); \ 1067 *(.data..percpu..read_mostly) \ 1068 . = ALIGN(cacheline); \ 1069 *(.data..percpu) \ 1070 *(.data..percpu..shared_aligned) \ 1071 PERCPU_DECRYPTED_SECTION \ 1072 __per_cpu_end = .; 1073 1074 /** 1075 * PERCPU_VADDR - define output section for percpu area 1076 * @cacheline: cacheline size 1077 * @vaddr: explicit base address (optional) 1078 * @phdr: destination PHDR (optional) 1079 * 1080 * Macro which expands to output section for percpu area. 1081 * 1082 * @cacheline is used to align subsections to avoid false cacheline 1083 * sharing between subsections for different purposes. 1084 * 1085 * If @vaddr is not blank, it specifies explicit base address and all 1086 * percpu symbols will be offset from the given address. If blank, 1087 * @vaddr always equals @laddr + LOAD_OFFSET. 1088 * 1089 * @phdr defines the output PHDR to use if not blank. Be warned that 1090 * output PHDR is sticky. If @phdr is specified, the next output 1091 * section in the linker script will go there too. @phdr should have 1092 * a leading colon. 1093 * 1094 * Note that this macros defines __per_cpu_load as an absolute symbol. 1095 * If there is no need to put the percpu section at a predetermined 1096 * address, use PERCPU_SECTION. 1097 */ 1098 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 1099 __per_cpu_load = .; \ 1100 .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \ 1101 PERCPU_INPUT(cacheline) \ 1102 } phdr \ 1103 . = __per_cpu_load + SIZEOF(.data..percpu); 1104 1105 /** 1106 * PERCPU_SECTION - define output section for percpu area, simple version 1107 * @cacheline: cacheline size 1108 * 1109 * Align to PAGE_SIZE and outputs output section for percpu area. This 1110 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 1111 * __per_cpu_start will be identical. 1112 * 1113 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 1114 * except that __per_cpu_load is defined as a relative symbol against 1115 * .data..percpu which is required for relocatable x86_32 configuration. 1116 */ 1117 #define PERCPU_SECTION(cacheline) \ 1118 . = ALIGN(PAGE_SIZE); \ 1119 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 1120 __per_cpu_load = .; \ 1121 PERCPU_INPUT(cacheline) \ 1122 } 1123 1124 1125 /* 1126 * Definition of the high level *_SECTION macros 1127 * They will fit only a subset of the architectures 1128 */ 1129 1130 1131 /* 1132 * Writeable data. 1133 * All sections are combined in a single .data section. 1134 * The sections following CONSTRUCTORS are arranged so their 1135 * typical alignment matches. 1136 * A cacheline is typical/always less than a PAGE_SIZE so 1137 * the sections that has this restriction (or similar) 1138 * is located before the ones requiring PAGE_SIZE alignment. 1139 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 1140 * matches the requirement of PAGE_ALIGNED_DATA. 1141 * 1142 * use 0 as page_align if page_aligned data is not used */ 1143 #define RW_DATA(cacheline, pagealigned, inittask) \ 1144 . = ALIGN(PAGE_SIZE); \ 1145 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 1146 INIT_TASK_DATA(inittask) \ 1147 NOSAVE_DATA \ 1148 PAGE_ALIGNED_DATA(pagealigned) \ 1149 CACHELINE_ALIGNED_DATA(cacheline) \ 1150 READ_MOSTLY_DATA(cacheline) \ 1151 DATA_DATA \ 1152 CONSTRUCTORS \ 1153 } \ 1154 BUG_TABLE \ 1155 1156 #define INIT_TEXT_SECTION(inittext_align) \ 1157 . = ALIGN(inittext_align); \ 1158 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 1159 _sinittext = .; \ 1160 INIT_TEXT \ 1161 _einittext = .; \ 1162 } 1163 1164 #define INIT_DATA_SECTION(initsetup_align) \ 1165 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 1166 INIT_DATA \ 1167 INIT_SETUP(initsetup_align) \ 1168 INIT_CALLS \ 1169 CON_INITCALL \ 1170 INIT_RAM_FS \ 1171 } 1172 1173 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 1174 . = ALIGN(sbss_align); \ 1175 __bss_start = .; \ 1176 SBSS(sbss_align) \ 1177 BSS(bss_align) \ 1178 . = ALIGN(stop_align); \ 1179 __bss_stop = .; 1180