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(PAGE_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_start = .; 34 * BSS_SECTION(0, 0) 35 * __bss_stop = .; 36 * _end = .; 37 * 38 * STABS_DEBUG 39 * DWARF_DEBUG 40 * 41 * DISCARDS // must be the last 42 * } 43 * 44 * [__init_begin, __init_end] is the init section that may be freed after init 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 #ifndef VMLINUX_SYMBOL 58 #define VMLINUX_SYMBOL(_sym_) _sym_ 59 #endif 60 61 /* Align . to a 8 byte boundary equals to maximum function alignment. */ 62 #define ALIGN_FUNCTION() . = ALIGN(8) 63 64 /* The actual configuration determine if the init/exit sections 65 * are handled as text/data or they can be discarded (which 66 * often happens at runtime) 67 */ 68 #ifdef CONFIG_HOTPLUG 69 #define DEV_KEEP(sec) *(.dev##sec) 70 #define DEV_DISCARD(sec) 71 #else 72 #define DEV_KEEP(sec) 73 #define DEV_DISCARD(sec) *(.dev##sec) 74 #endif 75 76 #ifdef CONFIG_HOTPLUG_CPU 77 #define CPU_KEEP(sec) *(.cpu##sec) 78 #define CPU_DISCARD(sec) 79 #else 80 #define CPU_KEEP(sec) 81 #define CPU_DISCARD(sec) *(.cpu##sec) 82 #endif 83 84 #if defined(CONFIG_MEMORY_HOTPLUG) 85 #define MEM_KEEP(sec) *(.mem##sec) 86 #define MEM_DISCARD(sec) 87 #else 88 #define MEM_KEEP(sec) 89 #define MEM_DISCARD(sec) *(.mem##sec) 90 #endif 91 92 #ifdef CONFIG_FTRACE_MCOUNT_RECORD 93 #define MCOUNT_REC() VMLINUX_SYMBOL(__start_mcount_loc) = .; \ 94 *(__mcount_loc) \ 95 VMLINUX_SYMBOL(__stop_mcount_loc) = .; 96 #else 97 #define MCOUNT_REC() 98 #endif 99 100 #ifdef CONFIG_TRACE_BRANCH_PROFILING 101 #define LIKELY_PROFILE() VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \ 102 *(_ftrace_annotated_branch) \ 103 VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .; 104 #else 105 #define LIKELY_PROFILE() 106 #endif 107 108 #ifdef CONFIG_PROFILE_ALL_BRANCHES 109 #define BRANCH_PROFILE() VMLINUX_SYMBOL(__start_branch_profile) = .; \ 110 *(_ftrace_branch) \ 111 VMLINUX_SYMBOL(__stop_branch_profile) = .; 112 #else 113 #define BRANCH_PROFILE() 114 #endif 115 116 #ifdef CONFIG_EVENT_TRACING 117 #define FTRACE_EVENTS() VMLINUX_SYMBOL(__start_ftrace_events) = .; \ 118 *(_ftrace_events) \ 119 VMLINUX_SYMBOL(__stop_ftrace_events) = .; 120 #else 121 #define FTRACE_EVENTS() 122 #endif 123 124 #ifdef CONFIG_TRACING 125 #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .; \ 126 *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \ 127 VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .; 128 #else 129 #define TRACE_PRINTKS() 130 #endif 131 132 #ifdef CONFIG_FTRACE_SYSCALLS 133 #define TRACE_SYSCALLS() VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \ 134 *(__syscalls_metadata) \ 135 VMLINUX_SYMBOL(__stop_syscalls_metadata) = .; 136 #else 137 #define TRACE_SYSCALLS() 138 #endif 139 140 /* .data section */ 141 #define DATA_DATA \ 142 *(.data) \ 143 *(.ref.data) \ 144 DEV_KEEP(init.data) \ 145 DEV_KEEP(exit.data) \ 146 CPU_KEEP(init.data) \ 147 CPU_KEEP(exit.data) \ 148 MEM_KEEP(init.data) \ 149 MEM_KEEP(exit.data) \ 150 . = ALIGN(8); \ 151 VMLINUX_SYMBOL(__start___markers) = .; \ 152 *(__markers) \ 153 VMLINUX_SYMBOL(__stop___markers) = .; \ 154 . = ALIGN(32); \ 155 VMLINUX_SYMBOL(__start___tracepoints) = .; \ 156 *(__tracepoints) \ 157 VMLINUX_SYMBOL(__stop___tracepoints) = .; \ 158 /* implement dynamic printk debug */ \ 159 . = ALIGN(8); \ 160 VMLINUX_SYMBOL(__start___verbose) = .; \ 161 *(__verbose) \ 162 VMLINUX_SYMBOL(__stop___verbose) = .; \ 163 LIKELY_PROFILE() \ 164 BRANCH_PROFILE() \ 165 TRACE_PRINTKS() \ 166 FTRACE_EVENTS() \ 167 TRACE_SYSCALLS() 168 169 /* 170 * Data section helpers 171 */ 172 #define NOSAVE_DATA \ 173 . = ALIGN(PAGE_SIZE); \ 174 VMLINUX_SYMBOL(__nosave_begin) = .; \ 175 *(.data.nosave) \ 176 . = ALIGN(PAGE_SIZE); \ 177 VMLINUX_SYMBOL(__nosave_end) = .; 178 179 #define PAGE_ALIGNED_DATA(page_align) \ 180 . = ALIGN(page_align); \ 181 *(.data.page_aligned) 182 183 #define READ_MOSTLY_DATA(align) \ 184 . = ALIGN(align); \ 185 *(.data.read_mostly) 186 187 #define CACHELINE_ALIGNED_DATA(align) \ 188 . = ALIGN(align); \ 189 *(.data.cacheline_aligned) 190 191 #define INIT_TASK(align) \ 192 . = ALIGN(align); \ 193 *(.data.init_task) 194 195 /* 196 * Read only Data 197 */ 198 #define RO_DATA_SECTION(align) \ 199 . = ALIGN((align)); \ 200 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 201 VMLINUX_SYMBOL(__start_rodata) = .; \ 202 *(.rodata) *(.rodata.*) \ 203 *(__vermagic) /* Kernel version magic */ \ 204 *(__markers_strings) /* Markers: strings */ \ 205 *(__tracepoints_strings)/* Tracepoints: strings */ \ 206 } \ 207 \ 208 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 209 *(.rodata1) \ 210 } \ 211 \ 212 BUG_TABLE \ 213 \ 214 /* PCI quirks */ \ 215 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 216 VMLINUX_SYMBOL(__start_pci_fixups_early) = .; \ 217 *(.pci_fixup_early) \ 218 VMLINUX_SYMBOL(__end_pci_fixups_early) = .; \ 219 VMLINUX_SYMBOL(__start_pci_fixups_header) = .; \ 220 *(.pci_fixup_header) \ 221 VMLINUX_SYMBOL(__end_pci_fixups_header) = .; \ 222 VMLINUX_SYMBOL(__start_pci_fixups_final) = .; \ 223 *(.pci_fixup_final) \ 224 VMLINUX_SYMBOL(__end_pci_fixups_final) = .; \ 225 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .; \ 226 *(.pci_fixup_enable) \ 227 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .; \ 228 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .; \ 229 *(.pci_fixup_resume) \ 230 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .; \ 231 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .; \ 232 *(.pci_fixup_resume_early) \ 233 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .; \ 234 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .; \ 235 *(.pci_fixup_suspend) \ 236 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .; \ 237 } \ 238 \ 239 /* Built-in firmware blobs */ \ 240 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \ 241 VMLINUX_SYMBOL(__start_builtin_fw) = .; \ 242 *(.builtin_fw) \ 243 VMLINUX_SYMBOL(__end_builtin_fw) = .; \ 244 } \ 245 \ 246 /* RapidIO route ops */ \ 247 .rio_route : AT(ADDR(.rio_route) - LOAD_OFFSET) { \ 248 VMLINUX_SYMBOL(__start_rio_route_ops) = .; \ 249 *(.rio_route_ops) \ 250 VMLINUX_SYMBOL(__end_rio_route_ops) = .; \ 251 } \ 252 \ 253 TRACEDATA \ 254 \ 255 /* Kernel symbol table: Normal symbols */ \ 256 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 257 VMLINUX_SYMBOL(__start___ksymtab) = .; \ 258 *(__ksymtab) \ 259 VMLINUX_SYMBOL(__stop___ksymtab) = .; \ 260 } \ 261 \ 262 /* Kernel symbol table: GPL-only symbols */ \ 263 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 264 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .; \ 265 *(__ksymtab_gpl) \ 266 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .; \ 267 } \ 268 \ 269 /* Kernel symbol table: Normal unused symbols */ \ 270 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \ 271 VMLINUX_SYMBOL(__start___ksymtab_unused) = .; \ 272 *(__ksymtab_unused) \ 273 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .; \ 274 } \ 275 \ 276 /* Kernel symbol table: GPL-only unused symbols */ \ 277 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \ 278 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .; \ 279 *(__ksymtab_unused_gpl) \ 280 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .; \ 281 } \ 282 \ 283 /* Kernel symbol table: GPL-future-only symbols */ \ 284 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \ 285 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .; \ 286 *(__ksymtab_gpl_future) \ 287 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .; \ 288 } \ 289 \ 290 /* Kernel symbol table: Normal symbols */ \ 291 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 292 VMLINUX_SYMBOL(__start___kcrctab) = .; \ 293 *(__kcrctab) \ 294 VMLINUX_SYMBOL(__stop___kcrctab) = .; \ 295 } \ 296 \ 297 /* Kernel symbol table: GPL-only symbols */ \ 298 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 299 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .; \ 300 *(__kcrctab_gpl) \ 301 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .; \ 302 } \ 303 \ 304 /* Kernel symbol table: Normal unused symbols */ \ 305 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \ 306 VMLINUX_SYMBOL(__start___kcrctab_unused) = .; \ 307 *(__kcrctab_unused) \ 308 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .; \ 309 } \ 310 \ 311 /* Kernel symbol table: GPL-only unused symbols */ \ 312 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \ 313 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .; \ 314 *(__kcrctab_unused_gpl) \ 315 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .; \ 316 } \ 317 \ 318 /* Kernel symbol table: GPL-future-only symbols */ \ 319 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \ 320 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .; \ 321 *(__kcrctab_gpl_future) \ 322 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .; \ 323 } \ 324 \ 325 /* Kernel symbol table: strings */ \ 326 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 327 *(__ksymtab_strings) \ 328 } \ 329 \ 330 /* __*init sections */ \ 331 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 332 *(.ref.rodata) \ 333 MCOUNT_REC() \ 334 DEV_KEEP(init.rodata) \ 335 DEV_KEEP(exit.rodata) \ 336 CPU_KEEP(init.rodata) \ 337 CPU_KEEP(exit.rodata) \ 338 MEM_KEEP(init.rodata) \ 339 MEM_KEEP(exit.rodata) \ 340 } \ 341 \ 342 /* Built-in module parameters. */ \ 343 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 344 VMLINUX_SYMBOL(__start___param) = .; \ 345 *(__param) \ 346 VMLINUX_SYMBOL(__stop___param) = .; \ 347 . = ALIGN((align)); \ 348 VMLINUX_SYMBOL(__end_rodata) = .; \ 349 } \ 350 . = ALIGN((align)); 351 352 /* RODATA & RO_DATA provided for backward compatibility. 353 * All archs are supposed to use RO_DATA() */ 354 #define RODATA RO_DATA_SECTION(4096) 355 #define RO_DATA(align) RO_DATA_SECTION(align) 356 357 #define SECURITY_INIT \ 358 .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \ 359 VMLINUX_SYMBOL(__security_initcall_start) = .; \ 360 *(.security_initcall.init) \ 361 VMLINUX_SYMBOL(__security_initcall_end) = .; \ 362 } 363 364 /* .text section. Map to function alignment to avoid address changes 365 * during second ld run in second ld pass when generating System.map */ 366 #define TEXT_TEXT \ 367 ALIGN_FUNCTION(); \ 368 *(.text.hot) \ 369 *(.text) \ 370 *(.ref.text) \ 371 DEV_KEEP(init.text) \ 372 DEV_KEEP(exit.text) \ 373 CPU_KEEP(init.text) \ 374 CPU_KEEP(exit.text) \ 375 MEM_KEEP(init.text) \ 376 MEM_KEEP(exit.text) \ 377 *(.text.unlikely) 378 379 380 /* sched.text is aling to function alignment to secure we have same 381 * address even at second ld pass when generating System.map */ 382 #define SCHED_TEXT \ 383 ALIGN_FUNCTION(); \ 384 VMLINUX_SYMBOL(__sched_text_start) = .; \ 385 *(.sched.text) \ 386 VMLINUX_SYMBOL(__sched_text_end) = .; 387 388 /* spinlock.text is aling to function alignment to secure we have same 389 * address even at second ld pass when generating System.map */ 390 #define LOCK_TEXT \ 391 ALIGN_FUNCTION(); \ 392 VMLINUX_SYMBOL(__lock_text_start) = .; \ 393 *(.spinlock.text) \ 394 VMLINUX_SYMBOL(__lock_text_end) = .; 395 396 #define KPROBES_TEXT \ 397 ALIGN_FUNCTION(); \ 398 VMLINUX_SYMBOL(__kprobes_text_start) = .; \ 399 *(.kprobes.text) \ 400 VMLINUX_SYMBOL(__kprobes_text_end) = .; 401 402 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 403 #define IRQENTRY_TEXT \ 404 ALIGN_FUNCTION(); \ 405 VMLINUX_SYMBOL(__irqentry_text_start) = .; \ 406 *(.irqentry.text) \ 407 VMLINUX_SYMBOL(__irqentry_text_end) = .; 408 #else 409 #define IRQENTRY_TEXT 410 #endif 411 412 /* Section used for early init (in .S files) */ 413 #define HEAD_TEXT *(.head.text) 414 415 #define HEAD_TEXT_SECTION \ 416 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 417 HEAD_TEXT \ 418 } 419 420 /* 421 * Exception table 422 */ 423 #define EXCEPTION_TABLE(align) \ 424 . = ALIGN(align); \ 425 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 426 VMLINUX_SYMBOL(__start___ex_table) = .; \ 427 *(__ex_table) \ 428 VMLINUX_SYMBOL(__stop___ex_table) = .; \ 429 } 430 431 /* 432 * Init task 433 */ 434 #define INIT_TASK_DATA(align) \ 435 . = ALIGN(align); \ 436 .data.init_task : { \ 437 INIT_TASK \ 438 } 439 440 #ifdef CONFIG_CONSTRUCTORS 441 #define KERNEL_CTORS() . = ALIGN(8); \ 442 VMLINUX_SYMBOL(__ctors_start) = .; \ 443 *(.ctors) \ 444 VMLINUX_SYMBOL(__ctors_end) = .; 445 #else 446 #define KERNEL_CTORS() 447 #endif 448 449 /* init and exit section handling */ 450 #define INIT_DATA \ 451 *(.init.data) \ 452 DEV_DISCARD(init.data) \ 453 CPU_DISCARD(init.data) \ 454 MEM_DISCARD(init.data) \ 455 KERNEL_CTORS() \ 456 *(.init.rodata) \ 457 DEV_DISCARD(init.rodata) \ 458 CPU_DISCARD(init.rodata) \ 459 MEM_DISCARD(init.rodata) 460 461 #define INIT_TEXT \ 462 *(.init.text) \ 463 DEV_DISCARD(init.text) \ 464 CPU_DISCARD(init.text) \ 465 MEM_DISCARD(init.text) 466 467 #define EXIT_DATA \ 468 *(.exit.data) \ 469 DEV_DISCARD(exit.data) \ 470 DEV_DISCARD(exit.rodata) \ 471 CPU_DISCARD(exit.data) \ 472 CPU_DISCARD(exit.rodata) \ 473 MEM_DISCARD(exit.data) \ 474 MEM_DISCARD(exit.rodata) 475 476 #define EXIT_TEXT \ 477 *(.exit.text) \ 478 DEV_DISCARD(exit.text) \ 479 CPU_DISCARD(exit.text) \ 480 MEM_DISCARD(exit.text) 481 482 #define EXIT_CALL \ 483 *(.exitcall.exit) 484 485 /* 486 * bss (Block Started by Symbol) - uninitialized data 487 * zeroed during startup 488 */ 489 #define SBSS \ 490 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 491 *(.sbss) \ 492 *(.scommon) \ 493 } 494 495 #define BSS(bss_align) \ 496 . = ALIGN(bss_align); \ 497 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 498 VMLINUX_SYMBOL(__bss_start) = .; \ 499 *(.bss.page_aligned) \ 500 *(.dynbss) \ 501 *(.bss) \ 502 *(COMMON) \ 503 VMLINUX_SYMBOL(__bss_stop) = .; \ 504 } 505 506 /* 507 * DWARF debug sections. 508 * Symbols in the DWARF debugging sections are relative to 509 * the beginning of the section so we begin them at 0. 510 */ 511 #define DWARF_DEBUG \ 512 /* DWARF 1 */ \ 513 .debug 0 : { *(.debug) } \ 514 .line 0 : { *(.line) } \ 515 /* GNU DWARF 1 extensions */ \ 516 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 517 .debug_sfnames 0 : { *(.debug_sfnames) } \ 518 /* DWARF 1.1 and DWARF 2 */ \ 519 .debug_aranges 0 : { *(.debug_aranges) } \ 520 .debug_pubnames 0 : { *(.debug_pubnames) } \ 521 /* DWARF 2 */ \ 522 .debug_info 0 : { *(.debug_info \ 523 .gnu.linkonce.wi.*) } \ 524 .debug_abbrev 0 : { *(.debug_abbrev) } \ 525 .debug_line 0 : { *(.debug_line) } \ 526 .debug_frame 0 : { *(.debug_frame) } \ 527 .debug_str 0 : { *(.debug_str) } \ 528 .debug_loc 0 : { *(.debug_loc) } \ 529 .debug_macinfo 0 : { *(.debug_macinfo) } \ 530 /* SGI/MIPS DWARF 2 extensions */ \ 531 .debug_weaknames 0 : { *(.debug_weaknames) } \ 532 .debug_funcnames 0 : { *(.debug_funcnames) } \ 533 .debug_typenames 0 : { *(.debug_typenames) } \ 534 .debug_varnames 0 : { *(.debug_varnames) } \ 535 536 /* Stabs debugging sections. */ 537 #define STABS_DEBUG \ 538 .stab 0 : { *(.stab) } \ 539 .stabstr 0 : { *(.stabstr) } \ 540 .stab.excl 0 : { *(.stab.excl) } \ 541 .stab.exclstr 0 : { *(.stab.exclstr) } \ 542 .stab.index 0 : { *(.stab.index) } \ 543 .stab.indexstr 0 : { *(.stab.indexstr) } \ 544 .comment 0 : { *(.comment) } 545 546 #ifdef CONFIG_GENERIC_BUG 547 #define BUG_TABLE \ 548 . = ALIGN(8); \ 549 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 550 VMLINUX_SYMBOL(__start___bug_table) = .; \ 551 *(__bug_table) \ 552 VMLINUX_SYMBOL(__stop___bug_table) = .; \ 553 } 554 #else 555 #define BUG_TABLE 556 #endif 557 558 #ifdef CONFIG_PM_TRACE 559 #define TRACEDATA \ 560 . = ALIGN(4); \ 561 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 562 VMLINUX_SYMBOL(__tracedata_start) = .; \ 563 *(.tracedata) \ 564 VMLINUX_SYMBOL(__tracedata_end) = .; \ 565 } 566 #else 567 #define TRACEDATA 568 #endif 569 570 #define NOTES \ 571 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 572 VMLINUX_SYMBOL(__start_notes) = .; \ 573 *(.note.*) \ 574 VMLINUX_SYMBOL(__stop_notes) = .; \ 575 } 576 577 #define INIT_SETUP(initsetup_align) \ 578 . = ALIGN(initsetup_align); \ 579 VMLINUX_SYMBOL(__setup_start) = .; \ 580 *(.init.setup) \ 581 VMLINUX_SYMBOL(__setup_end) = .; 582 583 #define INITCALLS \ 584 *(.initcallearly.init) \ 585 VMLINUX_SYMBOL(__early_initcall_end) = .; \ 586 *(.initcall0.init) \ 587 *(.initcall0s.init) \ 588 *(.initcall1.init) \ 589 *(.initcall1s.init) \ 590 *(.initcall2.init) \ 591 *(.initcall2s.init) \ 592 *(.initcall3.init) \ 593 *(.initcall3s.init) \ 594 *(.initcall4.init) \ 595 *(.initcall4s.init) \ 596 *(.initcall5.init) \ 597 *(.initcall5s.init) \ 598 *(.initcallrootfs.init) \ 599 *(.initcall6.init) \ 600 *(.initcall6s.init) \ 601 *(.initcall7.init) \ 602 *(.initcall7s.init) 603 604 #define INIT_CALLS \ 605 VMLINUX_SYMBOL(__initcall_start) = .; \ 606 INITCALLS \ 607 VMLINUX_SYMBOL(__initcall_end) = .; 608 609 #define CON_INITCALL \ 610 VMLINUX_SYMBOL(__con_initcall_start) = .; \ 611 *(.con_initcall.init) \ 612 VMLINUX_SYMBOL(__con_initcall_end) = .; 613 614 #define SECURITY_INITCALL \ 615 VMLINUX_SYMBOL(__security_initcall_start) = .; \ 616 *(.security_initcall.init) \ 617 VMLINUX_SYMBOL(__security_initcall_end) = .; 618 619 #ifdef CONFIG_BLK_DEV_INITRD 620 #define INIT_RAM_FS \ 621 . = ALIGN(PAGE_SIZE); \ 622 VMLINUX_SYMBOL(__initramfs_start) = .; \ 623 *(.init.ramfs) \ 624 VMLINUX_SYMBOL(__initramfs_end) = .; 625 #else 626 #define INIT_RAM_FS 627 #endif 628 629 /* 630 * Default discarded sections. 631 * 632 * Some archs want to discard exit text/data at runtime rather than 633 * link time due to cross-section references such as alt instructions, 634 * bug table, eh_frame, etc. DISCARDS must be the last of output 635 * section definitions so that such archs put those in earlier section 636 * definitions. 637 */ 638 #define DISCARDS \ 639 /DISCARD/ : { \ 640 EXIT_TEXT \ 641 EXIT_DATA \ 642 EXIT_CALL \ 643 *(.discard) \ 644 } 645 646 /** 647 * PERCPU_VADDR - define output section for percpu area 648 * @vaddr: explicit base address (optional) 649 * @phdr: destination PHDR (optional) 650 * 651 * Macro which expands to output section for percpu area. If @vaddr 652 * is not blank, it specifies explicit base address and all percpu 653 * symbols will be offset from the given address. If blank, @vaddr 654 * always equals @laddr + LOAD_OFFSET. 655 * 656 * @phdr defines the output PHDR to use if not blank. Be warned that 657 * output PHDR is sticky. If @phdr is specified, the next output 658 * section in the linker script will go there too. @phdr should have 659 * a leading colon. 660 * 661 * Note that this macros defines __per_cpu_load as an absolute symbol. 662 * If there is no need to put the percpu section at a predetermined 663 * address, use PERCPU(). 664 */ 665 #define PERCPU_VADDR(vaddr, phdr) \ 666 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 667 .data.percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load) \ 668 - LOAD_OFFSET) { \ 669 VMLINUX_SYMBOL(__per_cpu_start) = .; \ 670 *(.data.percpu.first) \ 671 *(.data.percpu.page_aligned) \ 672 *(.data.percpu) \ 673 *(.data.percpu.shared_aligned) \ 674 VMLINUX_SYMBOL(__per_cpu_end) = .; \ 675 } phdr \ 676 . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data.percpu); 677 678 /** 679 * PERCPU - define output section for percpu area, simple version 680 * @align: required alignment 681 * 682 * Align to @align and outputs output section for percpu area. This 683 * macro doesn't maniuplate @vaddr or @phdr and __per_cpu_load and 684 * __per_cpu_start will be identical. 685 * 686 * This macro is equivalent to ALIGN(align); PERCPU_VADDR( , ) except 687 * that __per_cpu_load is defined as a relative symbol against 688 * .data.percpu which is required for relocatable x86_32 689 * configuration. 690 */ 691 #define PERCPU(align) \ 692 . = ALIGN(align); \ 693 .data.percpu : AT(ADDR(.data.percpu) - LOAD_OFFSET) { \ 694 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 695 VMLINUX_SYMBOL(__per_cpu_start) = .; \ 696 *(.data.percpu.first) \ 697 *(.data.percpu.page_aligned) \ 698 *(.data.percpu) \ 699 *(.data.percpu.shared_aligned) \ 700 VMLINUX_SYMBOL(__per_cpu_end) = .; \ 701 } 702 703 704 /* 705 * Definition of the high level *_SECTION macros 706 * They will fit only a subset of the architectures 707 */ 708 709 710 /* 711 * Writeable data. 712 * All sections are combined in a single .data section. 713 * The sections following CONSTRUCTORS are arranged so their 714 * typical alignment matches. 715 * A cacheline is typical/always less than a PAGE_SIZE so 716 * the sections that has this restriction (or similar) 717 * is located before the ones requiring PAGE_SIZE alignment. 718 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 719 * matches the requirment of PAGE_ALIGNED_DATA. 720 * 721 * use 0 as page_align if page_aligned data is not used */ 722 #define RW_DATA_SECTION(cacheline, nosave, pagealigned, inittask) \ 723 . = ALIGN(PAGE_SIZE); \ 724 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 725 INIT_TASK(inittask) \ 726 CACHELINE_ALIGNED_DATA(cacheline) \ 727 READ_MOSTLY_DATA(cacheline) \ 728 DATA_DATA \ 729 CONSTRUCTORS \ 730 NOSAVE_DATA(nosave) \ 731 PAGE_ALIGNED_DATA(pagealigned) \ 732 } 733 734 #define INIT_TEXT_SECTION(inittext_align) \ 735 . = ALIGN(inittext_align); \ 736 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 737 VMLINUX_SYMBOL(_sinittext) = .; \ 738 INIT_TEXT \ 739 VMLINUX_SYMBOL(_einittext) = .; \ 740 } 741 742 #define INIT_DATA_SECTION(initsetup_align) \ 743 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 744 INIT_DATA \ 745 INIT_SETUP(initsetup_align) \ 746 INIT_CALLS \ 747 CON_INITCALL \ 748 SECURITY_INITCALL \ 749 INIT_RAM_FS \ 750 } 751 752 #define BSS_SECTION(sbss_align, bss_align) \ 753 SBSS \ 754 BSS(bss_align) \ 755 . = ALIGN(4); 756 757