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