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 #include <linux/export.h> 58 59 /* Align . to a 8 byte boundary equals to maximum function alignment. */ 60 #define ALIGN_FUNCTION() . = ALIGN(8) 61 62 /* 63 * Align to a 32 byte boundary equal to the 64 * alignment gcc 4.5 uses for a struct 65 */ 66 #define STRUCT_ALIGNMENT 32 67 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT) 68 69 /* The actual configuration determine if the init/exit sections 70 * are handled as text/data or they can be discarded (which 71 * often happens at runtime) 72 */ 73 #ifdef CONFIG_HOTPLUG_CPU 74 #define CPU_KEEP(sec) *(.cpu##sec) 75 #define CPU_DISCARD(sec) 76 #else 77 #define CPU_KEEP(sec) 78 #define CPU_DISCARD(sec) *(.cpu##sec) 79 #endif 80 81 #if defined(CONFIG_MEMORY_HOTPLUG) 82 #define MEM_KEEP(sec) *(.mem##sec) 83 #define MEM_DISCARD(sec) 84 #else 85 #define MEM_KEEP(sec) 86 #define MEM_DISCARD(sec) *(.mem##sec) 87 #endif 88 89 #ifdef CONFIG_FTRACE_MCOUNT_RECORD 90 #define MCOUNT_REC() . = ALIGN(8); \ 91 VMLINUX_SYMBOL(__start_mcount_loc) = .; \ 92 *(__mcount_loc) \ 93 VMLINUX_SYMBOL(__stop_mcount_loc) = .; 94 #else 95 #define MCOUNT_REC() 96 #endif 97 98 #ifdef CONFIG_TRACE_BRANCH_PROFILING 99 #define LIKELY_PROFILE() VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \ 100 *(_ftrace_annotated_branch) \ 101 VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .; 102 #else 103 #define LIKELY_PROFILE() 104 #endif 105 106 #ifdef CONFIG_PROFILE_ALL_BRANCHES 107 #define BRANCH_PROFILE() VMLINUX_SYMBOL(__start_branch_profile) = .; \ 108 *(_ftrace_branch) \ 109 VMLINUX_SYMBOL(__stop_branch_profile) = .; 110 #else 111 #define BRANCH_PROFILE() 112 #endif 113 114 #ifdef CONFIG_KPROBES 115 #define KPROBE_BLACKLIST() . = ALIGN(8); \ 116 VMLINUX_SYMBOL(__start_kprobe_blacklist) = .; \ 117 *(_kprobe_blacklist) \ 118 VMLINUX_SYMBOL(__stop_kprobe_blacklist) = .; 119 #else 120 #define KPROBE_BLACKLIST() 121 #endif 122 123 #ifdef CONFIG_EVENT_TRACING 124 #define FTRACE_EVENTS() . = ALIGN(8); \ 125 VMLINUX_SYMBOL(__start_ftrace_events) = .; \ 126 *(_ftrace_events) \ 127 VMLINUX_SYMBOL(__stop_ftrace_events) = .; \ 128 VMLINUX_SYMBOL(__start_ftrace_enum_maps) = .; \ 129 *(_ftrace_enum_map) \ 130 VMLINUX_SYMBOL(__stop_ftrace_enum_maps) = .; 131 #else 132 #define FTRACE_EVENTS() 133 #endif 134 135 #ifdef CONFIG_TRACING 136 #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .; \ 137 *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \ 138 VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .; 139 #define TRACEPOINT_STR() VMLINUX_SYMBOL(__start___tracepoint_str) = .; \ 140 *(__tracepoint_str) /* Trace_printk fmt' pointer */ \ 141 VMLINUX_SYMBOL(__stop___tracepoint_str) = .; 142 #else 143 #define TRACE_PRINTKS() 144 #define TRACEPOINT_STR() 145 #endif 146 147 #ifdef CONFIG_FTRACE_SYSCALLS 148 #define TRACE_SYSCALLS() . = ALIGN(8); \ 149 VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \ 150 *(__syscalls_metadata) \ 151 VMLINUX_SYMBOL(__stop_syscalls_metadata) = .; 152 #else 153 #define TRACE_SYSCALLS() 154 #endif 155 156 #ifdef CONFIG_SERIAL_EARLYCON 157 #define EARLYCON_TABLE() STRUCT_ALIGN(); \ 158 VMLINUX_SYMBOL(__earlycon_table) = .; \ 159 *(__earlycon_table) \ 160 VMLINUX_SYMBOL(__earlycon_table_end) = .; 161 #else 162 #define EARLYCON_TABLE() 163 #endif 164 165 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name) 166 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name) 167 #define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name) 168 #define _OF_TABLE_0(name) 169 #define _OF_TABLE_1(name) \ 170 . = ALIGN(8); \ 171 VMLINUX_SYMBOL(__##name##_of_table) = .; \ 172 *(__##name##_of_table) \ 173 *(__##name##_of_table_end) 174 175 #define CLKSRC_OF_TABLES() OF_TABLE(CONFIG_CLKSRC_OF, clksrc) 176 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip) 177 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk) 178 #define IOMMU_OF_TABLES() OF_TABLE(CONFIG_OF_IOMMU, iommu) 179 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem) 180 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method) 181 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method) 182 183 #ifdef CONFIG_ACPI 184 #define ACPI_PROBE_TABLE(name) \ 185 . = ALIGN(8); \ 186 VMLINUX_SYMBOL(__##name##_acpi_probe_table) = .; \ 187 *(__##name##_acpi_probe_table) \ 188 VMLINUX_SYMBOL(__##name##_acpi_probe_table_end) = .; 189 #else 190 #define ACPI_PROBE_TABLE(name) 191 #endif 192 193 #define KERNEL_DTB() \ 194 STRUCT_ALIGN(); \ 195 VMLINUX_SYMBOL(__dtb_start) = .; \ 196 *(.dtb.init.rodata) \ 197 VMLINUX_SYMBOL(__dtb_end) = .; 198 199 /* .data section */ 200 #define DATA_DATA \ 201 *(.data) \ 202 *(.ref.data) \ 203 *(.data..shared_aligned) /* percpu related */ \ 204 MEM_KEEP(init.data) \ 205 MEM_KEEP(exit.data) \ 206 *(.data.unlikely) \ 207 STRUCT_ALIGN(); \ 208 *(__tracepoints) \ 209 /* implement dynamic printk debug */ \ 210 . = ALIGN(8); \ 211 VMLINUX_SYMBOL(__start___jump_table) = .; \ 212 *(__jump_table) \ 213 VMLINUX_SYMBOL(__stop___jump_table) = .; \ 214 . = ALIGN(8); \ 215 VMLINUX_SYMBOL(__start___verbose) = .; \ 216 *(__verbose) \ 217 VMLINUX_SYMBOL(__stop___verbose) = .; \ 218 LIKELY_PROFILE() \ 219 BRANCH_PROFILE() \ 220 TRACE_PRINTKS() \ 221 TRACEPOINT_STR() 222 223 /* 224 * Data section helpers 225 */ 226 #define NOSAVE_DATA \ 227 . = ALIGN(PAGE_SIZE); \ 228 VMLINUX_SYMBOL(__nosave_begin) = .; \ 229 *(.data..nosave) \ 230 . = ALIGN(PAGE_SIZE); \ 231 VMLINUX_SYMBOL(__nosave_end) = .; 232 233 #define PAGE_ALIGNED_DATA(page_align) \ 234 . = ALIGN(page_align); \ 235 *(.data..page_aligned) 236 237 #define READ_MOSTLY_DATA(align) \ 238 . = ALIGN(align); \ 239 *(.data..read_mostly) \ 240 . = ALIGN(align); 241 242 #define CACHELINE_ALIGNED_DATA(align) \ 243 . = ALIGN(align); \ 244 *(.data..cacheline_aligned) 245 246 #define INIT_TASK_DATA(align) \ 247 . = ALIGN(align); \ 248 VMLINUX_SYMBOL(__start_init_task) = .; \ 249 *(.data..init_task) \ 250 VMLINUX_SYMBOL(__end_init_task) = .; 251 252 /* 253 * Allow architectures to handle ro_after_init data on their 254 * own by defining an empty RO_AFTER_INIT_DATA. 255 */ 256 #ifndef RO_AFTER_INIT_DATA 257 #define RO_AFTER_INIT_DATA *(.data..ro_after_init) 258 #endif 259 260 /* 261 * Read only Data 262 */ 263 #define RO_DATA_SECTION(align) \ 264 . = ALIGN((align)); \ 265 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 266 VMLINUX_SYMBOL(__start_rodata) = .; \ 267 *(.rodata) *(.rodata.*) \ 268 RO_AFTER_INIT_DATA /* Read only after init */ \ 269 *(__vermagic) /* Kernel version magic */ \ 270 . = ALIGN(8); \ 271 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .; \ 272 *(__tracepoints_ptrs) /* Tracepoints: pointer array */\ 273 VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .; \ 274 *(__tracepoints_strings)/* Tracepoints: strings */ \ 275 } \ 276 \ 277 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 278 *(.rodata1) \ 279 } \ 280 \ 281 BUG_TABLE \ 282 \ 283 /* PCI quirks */ \ 284 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 285 VMLINUX_SYMBOL(__start_pci_fixups_early) = .; \ 286 *(.pci_fixup_early) \ 287 VMLINUX_SYMBOL(__end_pci_fixups_early) = .; \ 288 VMLINUX_SYMBOL(__start_pci_fixups_header) = .; \ 289 *(.pci_fixup_header) \ 290 VMLINUX_SYMBOL(__end_pci_fixups_header) = .; \ 291 VMLINUX_SYMBOL(__start_pci_fixups_final) = .; \ 292 *(.pci_fixup_final) \ 293 VMLINUX_SYMBOL(__end_pci_fixups_final) = .; \ 294 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .; \ 295 *(.pci_fixup_enable) \ 296 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .; \ 297 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .; \ 298 *(.pci_fixup_resume) \ 299 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .; \ 300 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .; \ 301 *(.pci_fixup_resume_early) \ 302 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .; \ 303 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .; \ 304 *(.pci_fixup_suspend) \ 305 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .; \ 306 VMLINUX_SYMBOL(__start_pci_fixups_suspend_late) = .; \ 307 *(.pci_fixup_suspend_late) \ 308 VMLINUX_SYMBOL(__end_pci_fixups_suspend_late) = .; \ 309 } \ 310 \ 311 /* Built-in firmware blobs */ \ 312 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \ 313 VMLINUX_SYMBOL(__start_builtin_fw) = .; \ 314 *(.builtin_fw) \ 315 VMLINUX_SYMBOL(__end_builtin_fw) = .; \ 316 } \ 317 \ 318 TRACEDATA \ 319 \ 320 /* Kernel symbol table: Normal symbols */ \ 321 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 322 VMLINUX_SYMBOL(__start___ksymtab) = .; \ 323 *(SORT(___ksymtab+*)) \ 324 VMLINUX_SYMBOL(__stop___ksymtab) = .; \ 325 } \ 326 \ 327 /* Kernel symbol table: GPL-only symbols */ \ 328 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 329 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .; \ 330 *(SORT(___ksymtab_gpl+*)) \ 331 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .; \ 332 } \ 333 \ 334 /* Kernel symbol table: Normal unused symbols */ \ 335 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \ 336 VMLINUX_SYMBOL(__start___ksymtab_unused) = .; \ 337 *(SORT(___ksymtab_unused+*)) \ 338 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .; \ 339 } \ 340 \ 341 /* Kernel symbol table: GPL-only unused symbols */ \ 342 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \ 343 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .; \ 344 *(SORT(___ksymtab_unused_gpl+*)) \ 345 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .; \ 346 } \ 347 \ 348 /* Kernel symbol table: GPL-future-only symbols */ \ 349 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \ 350 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .; \ 351 *(SORT(___ksymtab_gpl_future+*)) \ 352 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .; \ 353 } \ 354 \ 355 /* Kernel symbol table: Normal symbols */ \ 356 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 357 VMLINUX_SYMBOL(__start___kcrctab) = .; \ 358 *(SORT(___kcrctab+*)) \ 359 VMLINUX_SYMBOL(__stop___kcrctab) = .; \ 360 } \ 361 \ 362 /* Kernel symbol table: GPL-only symbols */ \ 363 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 364 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .; \ 365 *(SORT(___kcrctab_gpl+*)) \ 366 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .; \ 367 } \ 368 \ 369 /* Kernel symbol table: Normal unused symbols */ \ 370 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \ 371 VMLINUX_SYMBOL(__start___kcrctab_unused) = .; \ 372 *(SORT(___kcrctab_unused+*)) \ 373 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .; \ 374 } \ 375 \ 376 /* Kernel symbol table: GPL-only unused symbols */ \ 377 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \ 378 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .; \ 379 *(SORT(___kcrctab_unused_gpl+*)) \ 380 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .; \ 381 } \ 382 \ 383 /* Kernel symbol table: GPL-future-only symbols */ \ 384 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \ 385 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .; \ 386 *(SORT(___kcrctab_gpl_future+*)) \ 387 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .; \ 388 } \ 389 \ 390 /* Kernel symbol table: strings */ \ 391 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 392 *(__ksymtab_strings) \ 393 } \ 394 \ 395 /* __*init sections */ \ 396 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 397 *(.ref.rodata) \ 398 MEM_KEEP(init.rodata) \ 399 MEM_KEEP(exit.rodata) \ 400 } \ 401 \ 402 /* Built-in module parameters. */ \ 403 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 404 VMLINUX_SYMBOL(__start___param) = .; \ 405 *(__param) \ 406 VMLINUX_SYMBOL(__stop___param) = .; \ 407 } \ 408 \ 409 /* Built-in module versions. */ \ 410 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 411 VMLINUX_SYMBOL(__start___modver) = .; \ 412 *(__modver) \ 413 VMLINUX_SYMBOL(__stop___modver) = .; \ 414 . = ALIGN((align)); \ 415 VMLINUX_SYMBOL(__end_rodata) = .; \ 416 } \ 417 . = ALIGN((align)); 418 419 /* RODATA & RO_DATA provided for backward compatibility. 420 * All archs are supposed to use RO_DATA() */ 421 #define RODATA RO_DATA_SECTION(4096) 422 #define RO_DATA(align) RO_DATA_SECTION(align) 423 424 #define SECURITY_INIT \ 425 .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \ 426 VMLINUX_SYMBOL(__security_initcall_start) = .; \ 427 *(.security_initcall.init) \ 428 VMLINUX_SYMBOL(__security_initcall_end) = .; \ 429 } 430 431 /* .text section. Map to function alignment to avoid address changes 432 * during second ld run in second ld pass when generating System.map */ 433 #define TEXT_TEXT \ 434 ALIGN_FUNCTION(); \ 435 *(.text.hot .text .text.fixup .text.unlikely) \ 436 *(.ref.text) \ 437 MEM_KEEP(init.text) \ 438 MEM_KEEP(exit.text) \ 439 440 441 /* sched.text is aling to function alignment to secure we have same 442 * address even at second ld pass when generating System.map */ 443 #define SCHED_TEXT \ 444 ALIGN_FUNCTION(); \ 445 VMLINUX_SYMBOL(__sched_text_start) = .; \ 446 *(.sched.text) \ 447 VMLINUX_SYMBOL(__sched_text_end) = .; 448 449 /* spinlock.text is aling to function alignment to secure we have same 450 * address even at second ld pass when generating System.map */ 451 #define LOCK_TEXT \ 452 ALIGN_FUNCTION(); \ 453 VMLINUX_SYMBOL(__lock_text_start) = .; \ 454 *(.spinlock.text) \ 455 VMLINUX_SYMBOL(__lock_text_end) = .; 456 457 #define KPROBES_TEXT \ 458 ALIGN_FUNCTION(); \ 459 VMLINUX_SYMBOL(__kprobes_text_start) = .; \ 460 *(.kprobes.text) \ 461 VMLINUX_SYMBOL(__kprobes_text_end) = .; 462 463 #define ENTRY_TEXT \ 464 ALIGN_FUNCTION(); \ 465 VMLINUX_SYMBOL(__entry_text_start) = .; \ 466 *(.entry.text) \ 467 VMLINUX_SYMBOL(__entry_text_end) = .; 468 469 #if defined(CONFIG_FUNCTION_GRAPH_TRACER) || defined(CONFIG_KASAN) 470 #define IRQENTRY_TEXT \ 471 ALIGN_FUNCTION(); \ 472 VMLINUX_SYMBOL(__irqentry_text_start) = .; \ 473 *(.irqentry.text) \ 474 VMLINUX_SYMBOL(__irqentry_text_end) = .; 475 #else 476 #define IRQENTRY_TEXT 477 #endif 478 479 #if defined(CONFIG_FUNCTION_GRAPH_TRACER) || defined(CONFIG_KASAN) 480 #define SOFTIRQENTRY_TEXT \ 481 ALIGN_FUNCTION(); \ 482 VMLINUX_SYMBOL(__softirqentry_text_start) = .; \ 483 *(.softirqentry.text) \ 484 VMLINUX_SYMBOL(__softirqentry_text_end) = .; 485 #else 486 #define SOFTIRQENTRY_TEXT 487 #endif 488 489 /* Section used for early init (in .S files) */ 490 #define HEAD_TEXT *(.head.text) 491 492 #define HEAD_TEXT_SECTION \ 493 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 494 HEAD_TEXT \ 495 } 496 497 /* 498 * Exception table 499 */ 500 #define EXCEPTION_TABLE(align) \ 501 . = ALIGN(align); \ 502 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 503 VMLINUX_SYMBOL(__start___ex_table) = .; \ 504 *(__ex_table) \ 505 VMLINUX_SYMBOL(__stop___ex_table) = .; \ 506 } 507 508 /* 509 * Init task 510 */ 511 #define INIT_TASK_DATA_SECTION(align) \ 512 . = ALIGN(align); \ 513 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 514 INIT_TASK_DATA(align) \ 515 } 516 517 #ifdef CONFIG_CONSTRUCTORS 518 #define KERNEL_CTORS() . = ALIGN(8); \ 519 VMLINUX_SYMBOL(__ctors_start) = .; \ 520 *(.ctors) \ 521 *(SORT(.init_array.*)) \ 522 *(.init_array) \ 523 VMLINUX_SYMBOL(__ctors_end) = .; 524 #else 525 #define KERNEL_CTORS() 526 #endif 527 528 /* init and exit section handling */ 529 #define INIT_DATA \ 530 *(.init.data) \ 531 MEM_DISCARD(init.data) \ 532 KERNEL_CTORS() \ 533 MCOUNT_REC() \ 534 *(.init.rodata) \ 535 FTRACE_EVENTS() \ 536 TRACE_SYSCALLS() \ 537 KPROBE_BLACKLIST() \ 538 MEM_DISCARD(init.rodata) \ 539 CLK_OF_TABLES() \ 540 RESERVEDMEM_OF_TABLES() \ 541 CLKSRC_OF_TABLES() \ 542 IOMMU_OF_TABLES() \ 543 CPU_METHOD_OF_TABLES() \ 544 CPUIDLE_METHOD_OF_TABLES() \ 545 KERNEL_DTB() \ 546 IRQCHIP_OF_MATCH_TABLE() \ 547 ACPI_PROBE_TABLE(irqchip) \ 548 ACPI_PROBE_TABLE(clksrc) \ 549 EARLYCON_TABLE() 550 551 #define INIT_TEXT \ 552 *(.init.text) \ 553 *(.text.startup) \ 554 MEM_DISCARD(init.text) 555 556 #define EXIT_DATA \ 557 *(.exit.data) \ 558 *(.fini_array) \ 559 *(.dtors) \ 560 MEM_DISCARD(exit.data) \ 561 MEM_DISCARD(exit.rodata) 562 563 #define EXIT_TEXT \ 564 *(.exit.text) \ 565 *(.text.exit) \ 566 MEM_DISCARD(exit.text) 567 568 #define EXIT_CALL \ 569 *(.exitcall.exit) 570 571 /* 572 * bss (Block Started by Symbol) - uninitialized data 573 * zeroed during startup 574 */ 575 #define SBSS(sbss_align) \ 576 . = ALIGN(sbss_align); \ 577 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 578 *(.sbss) \ 579 *(.scommon) \ 580 } 581 582 /* 583 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 584 * sections to the front of bss. 585 */ 586 #ifndef BSS_FIRST_SECTIONS 587 #define BSS_FIRST_SECTIONS 588 #endif 589 590 #define BSS(bss_align) \ 591 . = ALIGN(bss_align); \ 592 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 593 BSS_FIRST_SECTIONS \ 594 *(.bss..page_aligned) \ 595 *(.dynbss) \ 596 *(.bss) \ 597 *(COMMON) \ 598 } 599 600 /* 601 * DWARF debug sections. 602 * Symbols in the DWARF debugging sections are relative to 603 * the beginning of the section so we begin them at 0. 604 */ 605 #define DWARF_DEBUG \ 606 /* DWARF 1 */ \ 607 .debug 0 : { *(.debug) } \ 608 .line 0 : { *(.line) } \ 609 /* GNU DWARF 1 extensions */ \ 610 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 611 .debug_sfnames 0 : { *(.debug_sfnames) } \ 612 /* DWARF 1.1 and DWARF 2 */ \ 613 .debug_aranges 0 : { *(.debug_aranges) } \ 614 .debug_pubnames 0 : { *(.debug_pubnames) } \ 615 /* DWARF 2 */ \ 616 .debug_info 0 : { *(.debug_info \ 617 .gnu.linkonce.wi.*) } \ 618 .debug_abbrev 0 : { *(.debug_abbrev) } \ 619 .debug_line 0 : { *(.debug_line) } \ 620 .debug_frame 0 : { *(.debug_frame) } \ 621 .debug_str 0 : { *(.debug_str) } \ 622 .debug_loc 0 : { *(.debug_loc) } \ 623 .debug_macinfo 0 : { *(.debug_macinfo) } \ 624 /* SGI/MIPS DWARF 2 extensions */ \ 625 .debug_weaknames 0 : { *(.debug_weaknames) } \ 626 .debug_funcnames 0 : { *(.debug_funcnames) } \ 627 .debug_typenames 0 : { *(.debug_typenames) } \ 628 .debug_varnames 0 : { *(.debug_varnames) } \ 629 630 /* Stabs debugging sections. */ 631 #define STABS_DEBUG \ 632 .stab 0 : { *(.stab) } \ 633 .stabstr 0 : { *(.stabstr) } \ 634 .stab.excl 0 : { *(.stab.excl) } \ 635 .stab.exclstr 0 : { *(.stab.exclstr) } \ 636 .stab.index 0 : { *(.stab.index) } \ 637 .stab.indexstr 0 : { *(.stab.indexstr) } \ 638 .comment 0 : { *(.comment) } 639 640 #ifdef CONFIG_GENERIC_BUG 641 #define BUG_TABLE \ 642 . = ALIGN(8); \ 643 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 644 VMLINUX_SYMBOL(__start___bug_table) = .; \ 645 *(__bug_table) \ 646 VMLINUX_SYMBOL(__stop___bug_table) = .; \ 647 } 648 #else 649 #define BUG_TABLE 650 #endif 651 652 #ifdef CONFIG_PM_TRACE 653 #define TRACEDATA \ 654 . = ALIGN(4); \ 655 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 656 VMLINUX_SYMBOL(__tracedata_start) = .; \ 657 *(.tracedata) \ 658 VMLINUX_SYMBOL(__tracedata_end) = .; \ 659 } 660 #else 661 #define TRACEDATA 662 #endif 663 664 #define NOTES \ 665 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 666 VMLINUX_SYMBOL(__start_notes) = .; \ 667 *(.note.*) \ 668 VMLINUX_SYMBOL(__stop_notes) = .; \ 669 } 670 671 #define INIT_SETUP(initsetup_align) \ 672 . = ALIGN(initsetup_align); \ 673 VMLINUX_SYMBOL(__setup_start) = .; \ 674 *(.init.setup) \ 675 VMLINUX_SYMBOL(__setup_end) = .; 676 677 #define INIT_CALLS_LEVEL(level) \ 678 VMLINUX_SYMBOL(__initcall##level##_start) = .; \ 679 *(.initcall##level##.init) \ 680 *(.initcall##level##s.init) \ 681 682 #define INIT_CALLS \ 683 VMLINUX_SYMBOL(__initcall_start) = .; \ 684 *(.initcallearly.init) \ 685 INIT_CALLS_LEVEL(0) \ 686 INIT_CALLS_LEVEL(1) \ 687 INIT_CALLS_LEVEL(2) \ 688 INIT_CALLS_LEVEL(3) \ 689 INIT_CALLS_LEVEL(4) \ 690 INIT_CALLS_LEVEL(5) \ 691 INIT_CALLS_LEVEL(rootfs) \ 692 INIT_CALLS_LEVEL(6) \ 693 INIT_CALLS_LEVEL(7) \ 694 VMLINUX_SYMBOL(__initcall_end) = .; 695 696 #define CON_INITCALL \ 697 VMLINUX_SYMBOL(__con_initcall_start) = .; \ 698 *(.con_initcall.init) \ 699 VMLINUX_SYMBOL(__con_initcall_end) = .; 700 701 #define SECURITY_INITCALL \ 702 VMLINUX_SYMBOL(__security_initcall_start) = .; \ 703 *(.security_initcall.init) \ 704 VMLINUX_SYMBOL(__security_initcall_end) = .; 705 706 #ifdef CONFIG_BLK_DEV_INITRD 707 #define INIT_RAM_FS \ 708 . = ALIGN(4); \ 709 VMLINUX_SYMBOL(__initramfs_start) = .; \ 710 *(.init.ramfs) \ 711 . = ALIGN(8); \ 712 *(.init.ramfs.info) 713 #else 714 #define INIT_RAM_FS 715 #endif 716 717 /* 718 * Default discarded sections. 719 * 720 * Some archs want to discard exit text/data at runtime rather than 721 * link time due to cross-section references such as alt instructions, 722 * bug table, eh_frame, etc. DISCARDS must be the last of output 723 * section definitions so that such archs put those in earlier section 724 * definitions. 725 */ 726 #define DISCARDS \ 727 /DISCARD/ : { \ 728 EXIT_TEXT \ 729 EXIT_DATA \ 730 EXIT_CALL \ 731 *(.discard) \ 732 *(.discard.*) \ 733 } 734 735 /** 736 * PERCPU_INPUT - the percpu input sections 737 * @cacheline: cacheline size 738 * 739 * The core percpu section names and core symbols which do not rely 740 * directly upon load addresses. 741 * 742 * @cacheline is used to align subsections to avoid false cacheline 743 * sharing between subsections for different purposes. 744 */ 745 #define PERCPU_INPUT(cacheline) \ 746 VMLINUX_SYMBOL(__per_cpu_start) = .; \ 747 *(.data..percpu..first) \ 748 . = ALIGN(PAGE_SIZE); \ 749 *(.data..percpu..page_aligned) \ 750 . = ALIGN(cacheline); \ 751 *(.data..percpu..read_mostly) \ 752 . = ALIGN(cacheline); \ 753 *(.data..percpu) \ 754 *(.data..percpu..shared_aligned) \ 755 VMLINUX_SYMBOL(__per_cpu_end) = .; 756 757 /** 758 * PERCPU_VADDR - define output section for percpu area 759 * @cacheline: cacheline size 760 * @vaddr: explicit base address (optional) 761 * @phdr: destination PHDR (optional) 762 * 763 * Macro which expands to output section for percpu area. 764 * 765 * @cacheline is used to align subsections to avoid false cacheline 766 * sharing between subsections for different purposes. 767 * 768 * If @vaddr is not blank, it specifies explicit base address and all 769 * percpu symbols will be offset from the given address. If blank, 770 * @vaddr always equals @laddr + LOAD_OFFSET. 771 * 772 * @phdr defines the output PHDR to use if not blank. Be warned that 773 * output PHDR is sticky. If @phdr is specified, the next output 774 * section in the linker script will go there too. @phdr should have 775 * a leading colon. 776 * 777 * Note that this macros defines __per_cpu_load as an absolute symbol. 778 * If there is no need to put the percpu section at a predetermined 779 * address, use PERCPU_SECTION. 780 */ 781 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 782 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 783 .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load) \ 784 - LOAD_OFFSET) { \ 785 PERCPU_INPUT(cacheline) \ 786 } phdr \ 787 . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu); 788 789 /** 790 * PERCPU_SECTION - define output section for percpu area, simple version 791 * @cacheline: cacheline size 792 * 793 * Align to PAGE_SIZE and outputs output section for percpu area. This 794 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 795 * __per_cpu_start will be identical. 796 * 797 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 798 * except that __per_cpu_load is defined as a relative symbol against 799 * .data..percpu which is required for relocatable x86_32 configuration. 800 */ 801 #define PERCPU_SECTION(cacheline) \ 802 . = ALIGN(PAGE_SIZE); \ 803 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 804 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 805 PERCPU_INPUT(cacheline) \ 806 } 807 808 809 /* 810 * Definition of the high level *_SECTION macros 811 * They will fit only a subset of the architectures 812 */ 813 814 815 /* 816 * Writeable data. 817 * All sections are combined in a single .data section. 818 * The sections following CONSTRUCTORS are arranged so their 819 * typical alignment matches. 820 * A cacheline is typical/always less than a PAGE_SIZE so 821 * the sections that has this restriction (or similar) 822 * is located before the ones requiring PAGE_SIZE alignment. 823 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 824 * matches the requirement of PAGE_ALIGNED_DATA. 825 * 826 * use 0 as page_align if page_aligned data is not used */ 827 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \ 828 . = ALIGN(PAGE_SIZE); \ 829 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 830 INIT_TASK_DATA(inittask) \ 831 NOSAVE_DATA \ 832 PAGE_ALIGNED_DATA(pagealigned) \ 833 CACHELINE_ALIGNED_DATA(cacheline) \ 834 READ_MOSTLY_DATA(cacheline) \ 835 DATA_DATA \ 836 CONSTRUCTORS \ 837 } 838 839 #define INIT_TEXT_SECTION(inittext_align) \ 840 . = ALIGN(inittext_align); \ 841 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 842 VMLINUX_SYMBOL(_sinittext) = .; \ 843 INIT_TEXT \ 844 VMLINUX_SYMBOL(_einittext) = .; \ 845 } 846 847 #define INIT_DATA_SECTION(initsetup_align) \ 848 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 849 INIT_DATA \ 850 INIT_SETUP(initsetup_align) \ 851 INIT_CALLS \ 852 CON_INITCALL \ 853 SECURITY_INITCALL \ 854 INIT_RAM_FS \ 855 } 856 857 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 858 . = ALIGN(sbss_align); \ 859 VMLINUX_SYMBOL(__bss_start) = .; \ 860 SBSS(sbss_align) \ 861 BSS(bss_align) \ 862 . = ALIGN(stop_align); \ 863 VMLINUX_SYMBOL(__bss_stop) = .; 864