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