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(config_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 * Read only Data 254 */ 255 #define RO_DATA_SECTION(align) \ 256 . = ALIGN((align)); \ 257 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 258 VMLINUX_SYMBOL(__start_rodata) = .; \ 259 *(.rodata) *(.rodata.*) \ 260 *(.data..ro_after_init) /* Read only after init */ \ 261 *(__vermagic) /* Kernel version magic */ \ 262 . = ALIGN(8); \ 263 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .; \ 264 *(__tracepoints_ptrs) /* Tracepoints: pointer array */\ 265 VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .; \ 266 *(__tracepoints_strings)/* Tracepoints: strings */ \ 267 } \ 268 \ 269 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 270 *(.rodata1) \ 271 } \ 272 \ 273 BUG_TABLE \ 274 \ 275 /* PCI quirks */ \ 276 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 277 VMLINUX_SYMBOL(__start_pci_fixups_early) = .; \ 278 *(.pci_fixup_early) \ 279 VMLINUX_SYMBOL(__end_pci_fixups_early) = .; \ 280 VMLINUX_SYMBOL(__start_pci_fixups_header) = .; \ 281 *(.pci_fixup_header) \ 282 VMLINUX_SYMBOL(__end_pci_fixups_header) = .; \ 283 VMLINUX_SYMBOL(__start_pci_fixups_final) = .; \ 284 *(.pci_fixup_final) \ 285 VMLINUX_SYMBOL(__end_pci_fixups_final) = .; \ 286 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .; \ 287 *(.pci_fixup_enable) \ 288 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .; \ 289 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .; \ 290 *(.pci_fixup_resume) \ 291 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .; \ 292 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .; \ 293 *(.pci_fixup_resume_early) \ 294 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .; \ 295 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .; \ 296 *(.pci_fixup_suspend) \ 297 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .; \ 298 VMLINUX_SYMBOL(__start_pci_fixups_suspend_late) = .; \ 299 *(.pci_fixup_suspend_late) \ 300 VMLINUX_SYMBOL(__end_pci_fixups_suspend_late) = .; \ 301 } \ 302 \ 303 /* Built-in firmware blobs */ \ 304 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \ 305 VMLINUX_SYMBOL(__start_builtin_fw) = .; \ 306 *(.builtin_fw) \ 307 VMLINUX_SYMBOL(__end_builtin_fw) = .; \ 308 } \ 309 \ 310 TRACEDATA \ 311 \ 312 /* Kernel symbol table: Normal symbols */ \ 313 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 314 VMLINUX_SYMBOL(__start___ksymtab) = .; \ 315 *(SORT(___ksymtab+*)) \ 316 VMLINUX_SYMBOL(__stop___ksymtab) = .; \ 317 } \ 318 \ 319 /* Kernel symbol table: GPL-only symbols */ \ 320 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 321 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .; \ 322 *(SORT(___ksymtab_gpl+*)) \ 323 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .; \ 324 } \ 325 \ 326 /* Kernel symbol table: Normal unused symbols */ \ 327 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \ 328 VMLINUX_SYMBOL(__start___ksymtab_unused) = .; \ 329 *(SORT(___ksymtab_unused+*)) \ 330 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .; \ 331 } \ 332 \ 333 /* Kernel symbol table: GPL-only unused symbols */ \ 334 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \ 335 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .; \ 336 *(SORT(___ksymtab_unused_gpl+*)) \ 337 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .; \ 338 } \ 339 \ 340 /* Kernel symbol table: GPL-future-only symbols */ \ 341 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \ 342 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .; \ 343 *(SORT(___ksymtab_gpl_future+*)) \ 344 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .; \ 345 } \ 346 \ 347 /* Kernel symbol table: Normal symbols */ \ 348 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 349 VMLINUX_SYMBOL(__start___kcrctab) = .; \ 350 *(SORT(___kcrctab+*)) \ 351 VMLINUX_SYMBOL(__stop___kcrctab) = .; \ 352 } \ 353 \ 354 /* Kernel symbol table: GPL-only symbols */ \ 355 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 356 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .; \ 357 *(SORT(___kcrctab_gpl+*)) \ 358 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .; \ 359 } \ 360 \ 361 /* Kernel symbol table: Normal unused symbols */ \ 362 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \ 363 VMLINUX_SYMBOL(__start___kcrctab_unused) = .; \ 364 *(SORT(___kcrctab_unused+*)) \ 365 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .; \ 366 } \ 367 \ 368 /* Kernel symbol table: GPL-only unused symbols */ \ 369 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \ 370 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .; \ 371 *(SORT(___kcrctab_unused_gpl+*)) \ 372 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .; \ 373 } \ 374 \ 375 /* Kernel symbol table: GPL-future-only symbols */ \ 376 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \ 377 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .; \ 378 *(SORT(___kcrctab_gpl_future+*)) \ 379 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .; \ 380 } \ 381 \ 382 /* Kernel symbol table: strings */ \ 383 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 384 *(__ksymtab_strings) \ 385 } \ 386 \ 387 /* __*init sections */ \ 388 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 389 *(.ref.rodata) \ 390 MEM_KEEP(init.rodata) \ 391 MEM_KEEP(exit.rodata) \ 392 } \ 393 \ 394 /* Built-in module parameters. */ \ 395 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 396 VMLINUX_SYMBOL(__start___param) = .; \ 397 *(__param) \ 398 VMLINUX_SYMBOL(__stop___param) = .; \ 399 } \ 400 \ 401 /* Built-in module versions. */ \ 402 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 403 VMLINUX_SYMBOL(__start___modver) = .; \ 404 *(__modver) \ 405 VMLINUX_SYMBOL(__stop___modver) = .; \ 406 . = ALIGN((align)); \ 407 VMLINUX_SYMBOL(__end_rodata) = .; \ 408 } \ 409 . = ALIGN((align)); 410 411 /* RODATA & RO_DATA provided for backward compatibility. 412 * All archs are supposed to use RO_DATA() */ 413 #define RODATA RO_DATA_SECTION(4096) 414 #define RO_DATA(align) RO_DATA_SECTION(align) 415 416 #define SECURITY_INIT \ 417 .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \ 418 VMLINUX_SYMBOL(__security_initcall_start) = .; \ 419 *(.security_initcall.init) \ 420 VMLINUX_SYMBOL(__security_initcall_end) = .; \ 421 } 422 423 /* .text section. Map to function alignment to avoid address changes 424 * during second ld run in second ld pass when generating System.map */ 425 #define TEXT_TEXT \ 426 ALIGN_FUNCTION(); \ 427 *(.text.hot .text .text.fixup .text.unlikely) \ 428 *(.ref.text) \ 429 MEM_KEEP(init.text) \ 430 MEM_KEEP(exit.text) \ 431 432 433 /* sched.text is aling to function alignment to secure we have same 434 * address even at second ld pass when generating System.map */ 435 #define SCHED_TEXT \ 436 ALIGN_FUNCTION(); \ 437 VMLINUX_SYMBOL(__sched_text_start) = .; \ 438 *(.sched.text) \ 439 VMLINUX_SYMBOL(__sched_text_end) = .; 440 441 /* spinlock.text is aling to function alignment to secure we have same 442 * address even at second ld pass when generating System.map */ 443 #define LOCK_TEXT \ 444 ALIGN_FUNCTION(); \ 445 VMLINUX_SYMBOL(__lock_text_start) = .; \ 446 *(.spinlock.text) \ 447 VMLINUX_SYMBOL(__lock_text_end) = .; 448 449 #define KPROBES_TEXT \ 450 ALIGN_FUNCTION(); \ 451 VMLINUX_SYMBOL(__kprobes_text_start) = .; \ 452 *(.kprobes.text) \ 453 VMLINUX_SYMBOL(__kprobes_text_end) = .; 454 455 #define ENTRY_TEXT \ 456 ALIGN_FUNCTION(); \ 457 VMLINUX_SYMBOL(__entry_text_start) = .; \ 458 *(.entry.text) \ 459 VMLINUX_SYMBOL(__entry_text_end) = .; 460 461 #if defined(CONFIG_FUNCTION_GRAPH_TRACER) || defined(CONFIG_KASAN) 462 #define IRQENTRY_TEXT \ 463 ALIGN_FUNCTION(); \ 464 VMLINUX_SYMBOL(__irqentry_text_start) = .; \ 465 *(.irqentry.text) \ 466 VMLINUX_SYMBOL(__irqentry_text_end) = .; 467 #else 468 #define IRQENTRY_TEXT 469 #endif 470 471 #if defined(CONFIG_FUNCTION_GRAPH_TRACER) || defined(CONFIG_KASAN) 472 #define SOFTIRQENTRY_TEXT \ 473 ALIGN_FUNCTION(); \ 474 VMLINUX_SYMBOL(__softirqentry_text_start) = .; \ 475 *(.softirqentry.text) \ 476 VMLINUX_SYMBOL(__softirqentry_text_end) = .; 477 #else 478 #define SOFTIRQENTRY_TEXT 479 #endif 480 481 /* Section used for early init (in .S files) */ 482 #define HEAD_TEXT *(.head.text) 483 484 #define HEAD_TEXT_SECTION \ 485 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 486 HEAD_TEXT \ 487 } 488 489 /* 490 * Exception table 491 */ 492 #define EXCEPTION_TABLE(align) \ 493 . = ALIGN(align); \ 494 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 495 VMLINUX_SYMBOL(__start___ex_table) = .; \ 496 *(__ex_table) \ 497 VMLINUX_SYMBOL(__stop___ex_table) = .; \ 498 } 499 500 /* 501 * Init task 502 */ 503 #define INIT_TASK_DATA_SECTION(align) \ 504 . = ALIGN(align); \ 505 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 506 INIT_TASK_DATA(align) \ 507 } 508 509 #ifdef CONFIG_CONSTRUCTORS 510 #define KERNEL_CTORS() . = ALIGN(8); \ 511 VMLINUX_SYMBOL(__ctors_start) = .; \ 512 *(.ctors) \ 513 *(SORT(.init_array.*)) \ 514 *(.init_array) \ 515 VMLINUX_SYMBOL(__ctors_end) = .; 516 #else 517 #define KERNEL_CTORS() 518 #endif 519 520 /* init and exit section handling */ 521 #define INIT_DATA \ 522 *(.init.data) \ 523 MEM_DISCARD(init.data) \ 524 KERNEL_CTORS() \ 525 MCOUNT_REC() \ 526 *(.init.rodata) \ 527 FTRACE_EVENTS() \ 528 TRACE_SYSCALLS() \ 529 KPROBE_BLACKLIST() \ 530 MEM_DISCARD(init.rodata) \ 531 CLK_OF_TABLES() \ 532 RESERVEDMEM_OF_TABLES() \ 533 CLKSRC_OF_TABLES() \ 534 IOMMU_OF_TABLES() \ 535 CPU_METHOD_OF_TABLES() \ 536 CPUIDLE_METHOD_OF_TABLES() \ 537 KERNEL_DTB() \ 538 IRQCHIP_OF_MATCH_TABLE() \ 539 ACPI_PROBE_TABLE(irqchip) \ 540 ACPI_PROBE_TABLE(clksrc) \ 541 EARLYCON_TABLE() 542 543 #define INIT_TEXT \ 544 *(.init.text) \ 545 MEM_DISCARD(init.text) 546 547 #define EXIT_DATA \ 548 *(.exit.data) \ 549 MEM_DISCARD(exit.data) \ 550 MEM_DISCARD(exit.rodata) 551 552 #define EXIT_TEXT \ 553 *(.exit.text) \ 554 MEM_DISCARD(exit.text) 555 556 #define EXIT_CALL \ 557 *(.exitcall.exit) 558 559 /* 560 * bss (Block Started by Symbol) - uninitialized data 561 * zeroed during startup 562 */ 563 #define SBSS(sbss_align) \ 564 . = ALIGN(sbss_align); \ 565 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 566 *(.sbss) \ 567 *(.scommon) \ 568 } 569 570 /* 571 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 572 * sections to the front of bss. 573 */ 574 #ifndef BSS_FIRST_SECTIONS 575 #define BSS_FIRST_SECTIONS 576 #endif 577 578 #define BSS(bss_align) \ 579 . = ALIGN(bss_align); \ 580 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 581 BSS_FIRST_SECTIONS \ 582 *(.bss..page_aligned) \ 583 *(.dynbss) \ 584 *(.bss) \ 585 *(COMMON) \ 586 } 587 588 /* 589 * DWARF debug sections. 590 * Symbols in the DWARF debugging sections are relative to 591 * the beginning of the section so we begin them at 0. 592 */ 593 #define DWARF_DEBUG \ 594 /* DWARF 1 */ \ 595 .debug 0 : { *(.debug) } \ 596 .line 0 : { *(.line) } \ 597 /* GNU DWARF 1 extensions */ \ 598 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 599 .debug_sfnames 0 : { *(.debug_sfnames) } \ 600 /* DWARF 1.1 and DWARF 2 */ \ 601 .debug_aranges 0 : { *(.debug_aranges) } \ 602 .debug_pubnames 0 : { *(.debug_pubnames) } \ 603 /* DWARF 2 */ \ 604 .debug_info 0 : { *(.debug_info \ 605 .gnu.linkonce.wi.*) } \ 606 .debug_abbrev 0 : { *(.debug_abbrev) } \ 607 .debug_line 0 : { *(.debug_line) } \ 608 .debug_frame 0 : { *(.debug_frame) } \ 609 .debug_str 0 : { *(.debug_str) } \ 610 .debug_loc 0 : { *(.debug_loc) } \ 611 .debug_macinfo 0 : { *(.debug_macinfo) } \ 612 /* SGI/MIPS DWARF 2 extensions */ \ 613 .debug_weaknames 0 : { *(.debug_weaknames) } \ 614 .debug_funcnames 0 : { *(.debug_funcnames) } \ 615 .debug_typenames 0 : { *(.debug_typenames) } \ 616 .debug_varnames 0 : { *(.debug_varnames) } \ 617 618 /* Stabs debugging sections. */ 619 #define STABS_DEBUG \ 620 .stab 0 : { *(.stab) } \ 621 .stabstr 0 : { *(.stabstr) } \ 622 .stab.excl 0 : { *(.stab.excl) } \ 623 .stab.exclstr 0 : { *(.stab.exclstr) } \ 624 .stab.index 0 : { *(.stab.index) } \ 625 .stab.indexstr 0 : { *(.stab.indexstr) } \ 626 .comment 0 : { *(.comment) } 627 628 #ifdef CONFIG_GENERIC_BUG 629 #define BUG_TABLE \ 630 . = ALIGN(8); \ 631 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 632 VMLINUX_SYMBOL(__start___bug_table) = .; \ 633 *(__bug_table) \ 634 VMLINUX_SYMBOL(__stop___bug_table) = .; \ 635 } 636 #else 637 #define BUG_TABLE 638 #endif 639 640 #ifdef CONFIG_PM_TRACE 641 #define TRACEDATA \ 642 . = ALIGN(4); \ 643 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 644 VMLINUX_SYMBOL(__tracedata_start) = .; \ 645 *(.tracedata) \ 646 VMLINUX_SYMBOL(__tracedata_end) = .; \ 647 } 648 #else 649 #define TRACEDATA 650 #endif 651 652 #define NOTES \ 653 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 654 VMLINUX_SYMBOL(__start_notes) = .; \ 655 *(.note.*) \ 656 VMLINUX_SYMBOL(__stop_notes) = .; \ 657 } 658 659 #define INIT_SETUP(initsetup_align) \ 660 . = ALIGN(initsetup_align); \ 661 VMLINUX_SYMBOL(__setup_start) = .; \ 662 *(.init.setup) \ 663 VMLINUX_SYMBOL(__setup_end) = .; 664 665 #define INIT_CALLS_LEVEL(level) \ 666 VMLINUX_SYMBOL(__initcall##level##_start) = .; \ 667 *(.initcall##level##.init) \ 668 *(.initcall##level##s.init) \ 669 670 #define INIT_CALLS \ 671 VMLINUX_SYMBOL(__initcall_start) = .; \ 672 *(.initcallearly.init) \ 673 INIT_CALLS_LEVEL(0) \ 674 INIT_CALLS_LEVEL(1) \ 675 INIT_CALLS_LEVEL(2) \ 676 INIT_CALLS_LEVEL(3) \ 677 INIT_CALLS_LEVEL(4) \ 678 INIT_CALLS_LEVEL(5) \ 679 INIT_CALLS_LEVEL(rootfs) \ 680 INIT_CALLS_LEVEL(6) \ 681 INIT_CALLS_LEVEL(7) \ 682 VMLINUX_SYMBOL(__initcall_end) = .; 683 684 #define CON_INITCALL \ 685 VMLINUX_SYMBOL(__con_initcall_start) = .; \ 686 *(.con_initcall.init) \ 687 VMLINUX_SYMBOL(__con_initcall_end) = .; 688 689 #define SECURITY_INITCALL \ 690 VMLINUX_SYMBOL(__security_initcall_start) = .; \ 691 *(.security_initcall.init) \ 692 VMLINUX_SYMBOL(__security_initcall_end) = .; 693 694 #ifdef CONFIG_BLK_DEV_INITRD 695 #define INIT_RAM_FS \ 696 . = ALIGN(4); \ 697 VMLINUX_SYMBOL(__initramfs_start) = .; \ 698 *(.init.ramfs) \ 699 . = ALIGN(8); \ 700 *(.init.ramfs.info) 701 #else 702 #define INIT_RAM_FS 703 #endif 704 705 /* 706 * Default discarded sections. 707 * 708 * Some archs want to discard exit text/data at runtime rather than 709 * link time due to cross-section references such as alt instructions, 710 * bug table, eh_frame, etc. DISCARDS must be the last of output 711 * section definitions so that such archs put those in earlier section 712 * definitions. 713 */ 714 #define DISCARDS \ 715 /DISCARD/ : { \ 716 EXIT_TEXT \ 717 EXIT_DATA \ 718 EXIT_CALL \ 719 *(.discard) \ 720 *(.discard.*) \ 721 } 722 723 /** 724 * PERCPU_INPUT - the percpu input sections 725 * @cacheline: cacheline size 726 * 727 * The core percpu section names and core symbols which do not rely 728 * directly upon load addresses. 729 * 730 * @cacheline is used to align subsections to avoid false cacheline 731 * sharing between subsections for different purposes. 732 */ 733 #define PERCPU_INPUT(cacheline) \ 734 VMLINUX_SYMBOL(__per_cpu_start) = .; \ 735 *(.data..percpu..first) \ 736 . = ALIGN(PAGE_SIZE); \ 737 *(.data..percpu..page_aligned) \ 738 . = ALIGN(cacheline); \ 739 *(.data..percpu..read_mostly) \ 740 . = ALIGN(cacheline); \ 741 *(.data..percpu) \ 742 *(.data..percpu..shared_aligned) \ 743 VMLINUX_SYMBOL(__per_cpu_end) = .; 744 745 /** 746 * PERCPU_VADDR - define output section for percpu area 747 * @cacheline: cacheline size 748 * @vaddr: explicit base address (optional) 749 * @phdr: destination PHDR (optional) 750 * 751 * Macro which expands to output section for percpu area. 752 * 753 * @cacheline is used to align subsections to avoid false cacheline 754 * sharing between subsections for different purposes. 755 * 756 * If @vaddr is not blank, it specifies explicit base address and all 757 * percpu symbols will be offset from the given address. If blank, 758 * @vaddr always equals @laddr + LOAD_OFFSET. 759 * 760 * @phdr defines the output PHDR to use if not blank. Be warned that 761 * output PHDR is sticky. If @phdr is specified, the next output 762 * section in the linker script will go there too. @phdr should have 763 * a leading colon. 764 * 765 * Note that this macros defines __per_cpu_load as an absolute symbol. 766 * If there is no need to put the percpu section at a predetermined 767 * address, use PERCPU_SECTION. 768 */ 769 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 770 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 771 .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load) \ 772 - LOAD_OFFSET) { \ 773 PERCPU_INPUT(cacheline) \ 774 } phdr \ 775 . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu); 776 777 /** 778 * PERCPU_SECTION - define output section for percpu area, simple version 779 * @cacheline: cacheline size 780 * 781 * Align to PAGE_SIZE and outputs output section for percpu area. This 782 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 783 * __per_cpu_start will be identical. 784 * 785 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 786 * except that __per_cpu_load is defined as a relative symbol against 787 * .data..percpu which is required for relocatable x86_32 configuration. 788 */ 789 #define PERCPU_SECTION(cacheline) \ 790 . = ALIGN(PAGE_SIZE); \ 791 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 792 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 793 PERCPU_INPUT(cacheline) \ 794 } 795 796 797 /* 798 * Definition of the high level *_SECTION macros 799 * They will fit only a subset of the architectures 800 */ 801 802 803 /* 804 * Writeable data. 805 * All sections are combined in a single .data section. 806 * The sections following CONSTRUCTORS are arranged so their 807 * typical alignment matches. 808 * A cacheline is typical/always less than a PAGE_SIZE so 809 * the sections that has this restriction (or similar) 810 * is located before the ones requiring PAGE_SIZE alignment. 811 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 812 * matches the requirement of PAGE_ALIGNED_DATA. 813 * 814 * use 0 as page_align if page_aligned data is not used */ 815 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \ 816 . = ALIGN(PAGE_SIZE); \ 817 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 818 INIT_TASK_DATA(inittask) \ 819 NOSAVE_DATA \ 820 PAGE_ALIGNED_DATA(pagealigned) \ 821 CACHELINE_ALIGNED_DATA(cacheline) \ 822 READ_MOSTLY_DATA(cacheline) \ 823 DATA_DATA \ 824 CONSTRUCTORS \ 825 } 826 827 #define INIT_TEXT_SECTION(inittext_align) \ 828 . = ALIGN(inittext_align); \ 829 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 830 VMLINUX_SYMBOL(_sinittext) = .; \ 831 INIT_TEXT \ 832 VMLINUX_SYMBOL(_einittext) = .; \ 833 } 834 835 #define INIT_DATA_SECTION(initsetup_align) \ 836 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 837 INIT_DATA \ 838 INIT_SETUP(initsetup_align) \ 839 INIT_CALLS \ 840 CON_INITCALL \ 841 SECURITY_INITCALL \ 842 INIT_RAM_FS \ 843 } 844 845 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 846 . = ALIGN(sbss_align); \ 847 VMLINUX_SYMBOL(__bss_start) = .; \ 848 SBSS(sbss_align) \ 849 BSS(bss_align) \ 850 . = ALIGN(stop_align); \ 851 VMLINUX_SYMBOL(__bss_stop) = .; 852