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