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