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_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 * [_stext, _etext] is the text section 44 * [_sdata, _edata] is the data section 45 * 46 * Some of the included output section have their own set of constants. 47 * Examples are: [__initramfs_start, __initramfs_end] for initramfs and 48 * [__nosave_begin, __nosave_end] for the nosave data 49 */ 50 51 #ifndef LOAD_OFFSET 52 #define LOAD_OFFSET 0 53 #endif 54 55 #ifndef VMLINUX_SYMBOL 56 #define VMLINUX_SYMBOL(_sym_) _sym_ 57 #endif 58 59 /* Align . to a 8 byte boundary equals to maximum function alignment. */ 60 #define ALIGN_FUNCTION() . = ALIGN(8) 61 62 /* The actual configuration determine if the init/exit sections 63 * are handled as text/data or they can be discarded (which 64 * often happens at runtime) 65 */ 66 #ifdef CONFIG_HOTPLUG 67 #define DEV_KEEP(sec) *(.dev##sec) 68 #define DEV_DISCARD(sec) 69 #else 70 #define DEV_KEEP(sec) 71 #define DEV_DISCARD(sec) *(.dev##sec) 72 #endif 73 74 #ifdef CONFIG_HOTPLUG_CPU 75 #define CPU_KEEP(sec) *(.cpu##sec) 76 #define CPU_DISCARD(sec) 77 #else 78 #define CPU_KEEP(sec) 79 #define CPU_DISCARD(sec) *(.cpu##sec) 80 #endif 81 82 #if defined(CONFIG_MEMORY_HOTPLUG) 83 #define MEM_KEEP(sec) *(.mem##sec) 84 #define MEM_DISCARD(sec) 85 #else 86 #define MEM_KEEP(sec) 87 #define MEM_DISCARD(sec) *(.mem##sec) 88 #endif 89 90 #ifdef CONFIG_FTRACE_MCOUNT_RECORD 91 #define MCOUNT_REC() 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_EVENT_TRACING 115 #define FTRACE_EVENTS() VMLINUX_SYMBOL(__start_ftrace_events) = .; \ 116 *(_ftrace_events) \ 117 VMLINUX_SYMBOL(__stop_ftrace_events) = .; 118 #else 119 #define FTRACE_EVENTS() 120 #endif 121 122 #ifdef CONFIG_TRACING 123 #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .; \ 124 *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \ 125 VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .; 126 #else 127 #define TRACE_PRINTKS() 128 #endif 129 130 #ifdef CONFIG_FTRACE_SYSCALLS 131 #define TRACE_SYSCALLS() VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \ 132 *(__syscalls_metadata) \ 133 VMLINUX_SYMBOL(__stop_syscalls_metadata) = .; 134 #else 135 #define TRACE_SYSCALLS() 136 #endif 137 138 /* .data section */ 139 #define DATA_DATA \ 140 *(.data) \ 141 *(.ref.data) \ 142 DEV_KEEP(init.data) \ 143 DEV_KEEP(exit.data) \ 144 CPU_KEEP(init.data) \ 145 CPU_KEEP(exit.data) \ 146 MEM_KEEP(init.data) \ 147 MEM_KEEP(exit.data) \ 148 . = ALIGN(8); \ 149 VMLINUX_SYMBOL(__start___markers) = .; \ 150 *(__markers) \ 151 VMLINUX_SYMBOL(__stop___markers) = .; \ 152 . = ALIGN(32); \ 153 VMLINUX_SYMBOL(__start___tracepoints) = .; \ 154 *(__tracepoints) \ 155 VMLINUX_SYMBOL(__stop___tracepoints) = .; \ 156 /* implement dynamic printk debug */ \ 157 . = ALIGN(8); \ 158 VMLINUX_SYMBOL(__start___verbose) = .; \ 159 *(__verbose) \ 160 VMLINUX_SYMBOL(__stop___verbose) = .; \ 161 LIKELY_PROFILE() \ 162 BRANCH_PROFILE() \ 163 TRACE_PRINTKS() \ 164 FTRACE_EVENTS() \ 165 TRACE_SYSCALLS() 166 167 /* 168 * Data section helpers 169 */ 170 #define NOSAVE_DATA \ 171 . = ALIGN(PAGE_SIZE); \ 172 VMLINUX_SYMBOL(__nosave_begin) = .; \ 173 *(.data.nosave) \ 174 . = ALIGN(PAGE_SIZE); \ 175 VMLINUX_SYMBOL(__nosave_end) = .; 176 177 #define PAGE_ALIGNED_DATA(page_align) \ 178 . = ALIGN(page_align); \ 179 *(.data.page_aligned) 180 181 #define READ_MOSTLY_DATA(align) \ 182 . = ALIGN(align); \ 183 *(.data.read_mostly) 184 185 #define CACHELINE_ALIGNED_DATA(align) \ 186 . = ALIGN(align); \ 187 *(.data.cacheline_aligned) 188 189 #define INIT_TASK_DATA(align) \ 190 . = ALIGN(align); \ 191 *(.data.init_task) 192 193 /* 194 * Read only Data 195 */ 196 #define RO_DATA_SECTION(align) \ 197 . = ALIGN((align)); \ 198 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 199 VMLINUX_SYMBOL(__start_rodata) = .; \ 200 *(.rodata) *(.rodata.*) \ 201 *(__vermagic) /* Kernel version magic */ \ 202 *(__markers_strings) /* Markers: strings */ \ 203 *(__tracepoints_strings)/* Tracepoints: strings */ \ 204 } \ 205 \ 206 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 207 *(.rodata1) \ 208 } \ 209 \ 210 BUG_TABLE \ 211 \ 212 /* PCI quirks */ \ 213 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 214 VMLINUX_SYMBOL(__start_pci_fixups_early) = .; \ 215 *(.pci_fixup_early) \ 216 VMLINUX_SYMBOL(__end_pci_fixups_early) = .; \ 217 VMLINUX_SYMBOL(__start_pci_fixups_header) = .; \ 218 *(.pci_fixup_header) \ 219 VMLINUX_SYMBOL(__end_pci_fixups_header) = .; \ 220 VMLINUX_SYMBOL(__start_pci_fixups_final) = .; \ 221 *(.pci_fixup_final) \ 222 VMLINUX_SYMBOL(__end_pci_fixups_final) = .; \ 223 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .; \ 224 *(.pci_fixup_enable) \ 225 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .; \ 226 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .; \ 227 *(.pci_fixup_resume) \ 228 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .; \ 229 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .; \ 230 *(.pci_fixup_resume_early) \ 231 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .; \ 232 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .; \ 233 *(.pci_fixup_suspend) \ 234 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .; \ 235 } \ 236 \ 237 /* Built-in firmware blobs */ \ 238 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \ 239 VMLINUX_SYMBOL(__start_builtin_fw) = .; \ 240 *(.builtin_fw) \ 241 VMLINUX_SYMBOL(__end_builtin_fw) = .; \ 242 } \ 243 \ 244 /* RapidIO route ops */ \ 245 .rio_route : AT(ADDR(.rio_route) - LOAD_OFFSET) { \ 246 VMLINUX_SYMBOL(__start_rio_route_ops) = .; \ 247 *(.rio_route_ops) \ 248 VMLINUX_SYMBOL(__end_rio_route_ops) = .; \ 249 } \ 250 \ 251 TRACEDATA \ 252 \ 253 /* Kernel symbol table: Normal symbols */ \ 254 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 255 VMLINUX_SYMBOL(__start___ksymtab) = .; \ 256 *(__ksymtab) \ 257 VMLINUX_SYMBOL(__stop___ksymtab) = .; \ 258 } \ 259 \ 260 /* Kernel symbol table: GPL-only symbols */ \ 261 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 262 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .; \ 263 *(__ksymtab_gpl) \ 264 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .; \ 265 } \ 266 \ 267 /* Kernel symbol table: Normal unused symbols */ \ 268 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \ 269 VMLINUX_SYMBOL(__start___ksymtab_unused) = .; \ 270 *(__ksymtab_unused) \ 271 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .; \ 272 } \ 273 \ 274 /* Kernel symbol table: GPL-only unused symbols */ \ 275 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \ 276 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .; \ 277 *(__ksymtab_unused_gpl) \ 278 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .; \ 279 } \ 280 \ 281 /* Kernel symbol table: GPL-future-only symbols */ \ 282 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \ 283 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .; \ 284 *(__ksymtab_gpl_future) \ 285 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .; \ 286 } \ 287 \ 288 /* Kernel symbol table: Normal symbols */ \ 289 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 290 VMLINUX_SYMBOL(__start___kcrctab) = .; \ 291 *(__kcrctab) \ 292 VMLINUX_SYMBOL(__stop___kcrctab) = .; \ 293 } \ 294 \ 295 /* Kernel symbol table: GPL-only symbols */ \ 296 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 297 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .; \ 298 *(__kcrctab_gpl) \ 299 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .; \ 300 } \ 301 \ 302 /* Kernel symbol table: Normal unused symbols */ \ 303 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \ 304 VMLINUX_SYMBOL(__start___kcrctab_unused) = .; \ 305 *(__kcrctab_unused) \ 306 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .; \ 307 } \ 308 \ 309 /* Kernel symbol table: GPL-only unused symbols */ \ 310 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \ 311 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .; \ 312 *(__kcrctab_unused_gpl) \ 313 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .; \ 314 } \ 315 \ 316 /* Kernel symbol table: GPL-future-only symbols */ \ 317 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \ 318 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .; \ 319 *(__kcrctab_gpl_future) \ 320 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .; \ 321 } \ 322 \ 323 /* Kernel symbol table: strings */ \ 324 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 325 *(__ksymtab_strings) \ 326 } \ 327 \ 328 /* __*init sections */ \ 329 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 330 *(.ref.rodata) \ 331 MCOUNT_REC() \ 332 DEV_KEEP(init.rodata) \ 333 DEV_KEEP(exit.rodata) \ 334 CPU_KEEP(init.rodata) \ 335 CPU_KEEP(exit.rodata) \ 336 MEM_KEEP(init.rodata) \ 337 MEM_KEEP(exit.rodata) \ 338 } \ 339 \ 340 /* Built-in module parameters. */ \ 341 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 342 VMLINUX_SYMBOL(__start___param) = .; \ 343 *(__param) \ 344 VMLINUX_SYMBOL(__stop___param) = .; \ 345 . = ALIGN((align)); \ 346 VMLINUX_SYMBOL(__end_rodata) = .; \ 347 } \ 348 . = ALIGN((align)); 349 350 /* RODATA & RO_DATA provided for backward compatibility. 351 * All archs are supposed to use RO_DATA() */ 352 #define RODATA RO_DATA_SECTION(4096) 353 #define RO_DATA(align) RO_DATA_SECTION(align) 354 355 #define SECURITY_INIT \ 356 .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \ 357 VMLINUX_SYMBOL(__security_initcall_start) = .; \ 358 *(.security_initcall.init) \ 359 VMLINUX_SYMBOL(__security_initcall_end) = .; \ 360 } 361 362 /* .text section. Map to function alignment to avoid address changes 363 * during second ld run in second ld pass when generating System.map */ 364 #define TEXT_TEXT \ 365 ALIGN_FUNCTION(); \ 366 *(.text.hot) \ 367 *(.text) \ 368 *(.ref.text) \ 369 DEV_KEEP(init.text) \ 370 DEV_KEEP(exit.text) \ 371 CPU_KEEP(init.text) \ 372 CPU_KEEP(exit.text) \ 373 MEM_KEEP(init.text) \ 374 MEM_KEEP(exit.text) \ 375 *(.text.unlikely) 376 377 378 /* sched.text is aling to function alignment to secure we have same 379 * address even at second ld pass when generating System.map */ 380 #define SCHED_TEXT \ 381 ALIGN_FUNCTION(); \ 382 VMLINUX_SYMBOL(__sched_text_start) = .; \ 383 *(.sched.text) \ 384 VMLINUX_SYMBOL(__sched_text_end) = .; 385 386 /* spinlock.text is aling to function alignment to secure we have same 387 * address even at second ld pass when generating System.map */ 388 #define LOCK_TEXT \ 389 ALIGN_FUNCTION(); \ 390 VMLINUX_SYMBOL(__lock_text_start) = .; \ 391 *(.spinlock.text) \ 392 VMLINUX_SYMBOL(__lock_text_end) = .; 393 394 #define KPROBES_TEXT \ 395 ALIGN_FUNCTION(); \ 396 VMLINUX_SYMBOL(__kprobes_text_start) = .; \ 397 *(.kprobes.text) \ 398 VMLINUX_SYMBOL(__kprobes_text_end) = .; 399 400 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 401 #define IRQENTRY_TEXT \ 402 ALIGN_FUNCTION(); \ 403 VMLINUX_SYMBOL(__irqentry_text_start) = .; \ 404 *(.irqentry.text) \ 405 VMLINUX_SYMBOL(__irqentry_text_end) = .; 406 #else 407 #define IRQENTRY_TEXT 408 #endif 409 410 /* Section used for early init (in .S files) */ 411 #define HEAD_TEXT *(.head.text) 412 413 #define HEAD_TEXT_SECTION \ 414 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 415 HEAD_TEXT \ 416 } 417 418 /* 419 * Exception table 420 */ 421 #define EXCEPTION_TABLE(align) \ 422 . = ALIGN(align); \ 423 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 424 VMLINUX_SYMBOL(__start___ex_table) = .; \ 425 *(__ex_table) \ 426 VMLINUX_SYMBOL(__stop___ex_table) = .; \ 427 } 428 429 /* 430 * Init task 431 */ 432 #define INIT_TASK_DATA_SECTION(align) \ 433 . = ALIGN(align); \ 434 .data.init_task : { \ 435 INIT_TASK_DATA(align) \ 436 } 437 438 #ifdef CONFIG_CONSTRUCTORS 439 #define KERNEL_CTORS() . = ALIGN(8); \ 440 VMLINUX_SYMBOL(__ctors_start) = .; \ 441 *(.ctors) \ 442 VMLINUX_SYMBOL(__ctors_end) = .; 443 #else 444 #define KERNEL_CTORS() 445 #endif 446 447 /* init and exit section handling */ 448 #define INIT_DATA \ 449 *(.init.data) \ 450 DEV_DISCARD(init.data) \ 451 CPU_DISCARD(init.data) \ 452 MEM_DISCARD(init.data) \ 453 KERNEL_CTORS() \ 454 *(.init.rodata) \ 455 DEV_DISCARD(init.rodata) \ 456 CPU_DISCARD(init.rodata) \ 457 MEM_DISCARD(init.rodata) 458 459 #define INIT_TEXT \ 460 *(.init.text) \ 461 DEV_DISCARD(init.text) \ 462 CPU_DISCARD(init.text) \ 463 MEM_DISCARD(init.text) 464 465 #define EXIT_DATA \ 466 *(.exit.data) \ 467 DEV_DISCARD(exit.data) \ 468 DEV_DISCARD(exit.rodata) \ 469 CPU_DISCARD(exit.data) \ 470 CPU_DISCARD(exit.rodata) \ 471 MEM_DISCARD(exit.data) \ 472 MEM_DISCARD(exit.rodata) 473 474 #define EXIT_TEXT \ 475 *(.exit.text) \ 476 DEV_DISCARD(exit.text) \ 477 CPU_DISCARD(exit.text) \ 478 MEM_DISCARD(exit.text) 479 480 #define EXIT_CALL \ 481 *(.exitcall.exit) 482 483 /* 484 * bss (Block Started by Symbol) - uninitialized data 485 * zeroed during startup 486 */ 487 #define SBSS(sbss_align) \ 488 . = ALIGN(sbss_align); \ 489 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 490 *(.sbss) \ 491 *(.scommon) \ 492 } 493 494 #define BSS(bss_align) \ 495 . = ALIGN(bss_align); \ 496 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 497 *(.bss.page_aligned) \ 498 *(.dynbss) \ 499 *(.bss) \ 500 *(COMMON) \ 501 } 502 503 /* 504 * DWARF debug sections. 505 * Symbols in the DWARF debugging sections are relative to 506 * the beginning of the section so we begin them at 0. 507 */ 508 #define DWARF_DEBUG \ 509 /* DWARF 1 */ \ 510 .debug 0 : { *(.debug) } \ 511 .line 0 : { *(.line) } \ 512 /* GNU DWARF 1 extensions */ \ 513 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 514 .debug_sfnames 0 : { *(.debug_sfnames) } \ 515 /* DWARF 1.1 and DWARF 2 */ \ 516 .debug_aranges 0 : { *(.debug_aranges) } \ 517 .debug_pubnames 0 : { *(.debug_pubnames) } \ 518 /* DWARF 2 */ \ 519 .debug_info 0 : { *(.debug_info \ 520 .gnu.linkonce.wi.*) } \ 521 .debug_abbrev 0 : { *(.debug_abbrev) } \ 522 .debug_line 0 : { *(.debug_line) } \ 523 .debug_frame 0 : { *(.debug_frame) } \ 524 .debug_str 0 : { *(.debug_str) } \ 525 .debug_loc 0 : { *(.debug_loc) } \ 526 .debug_macinfo 0 : { *(.debug_macinfo) } \ 527 /* SGI/MIPS DWARF 2 extensions */ \ 528 .debug_weaknames 0 : { *(.debug_weaknames) } \ 529 .debug_funcnames 0 : { *(.debug_funcnames) } \ 530 .debug_typenames 0 : { *(.debug_typenames) } \ 531 .debug_varnames 0 : { *(.debug_varnames) } \ 532 533 /* Stabs debugging sections. */ 534 #define STABS_DEBUG \ 535 .stab 0 : { *(.stab) } \ 536 .stabstr 0 : { *(.stabstr) } \ 537 .stab.excl 0 : { *(.stab.excl) } \ 538 .stab.exclstr 0 : { *(.stab.exclstr) } \ 539 .stab.index 0 : { *(.stab.index) } \ 540 .stab.indexstr 0 : { *(.stab.indexstr) } \ 541 .comment 0 : { *(.comment) } 542 543 #ifdef CONFIG_GENERIC_BUG 544 #define BUG_TABLE \ 545 . = ALIGN(8); \ 546 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 547 VMLINUX_SYMBOL(__start___bug_table) = .; \ 548 *(__bug_table) \ 549 VMLINUX_SYMBOL(__stop___bug_table) = .; \ 550 } 551 #else 552 #define BUG_TABLE 553 #endif 554 555 #ifdef CONFIG_PM_TRACE 556 #define TRACEDATA \ 557 . = ALIGN(4); \ 558 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 559 VMLINUX_SYMBOL(__tracedata_start) = .; \ 560 *(.tracedata) \ 561 VMLINUX_SYMBOL(__tracedata_end) = .; \ 562 } 563 #else 564 #define TRACEDATA 565 #endif 566 567 #define NOTES \ 568 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 569 VMLINUX_SYMBOL(__start_notes) = .; \ 570 *(.note.*) \ 571 VMLINUX_SYMBOL(__stop_notes) = .; \ 572 } 573 574 #define INIT_SETUP(initsetup_align) \ 575 . = ALIGN(initsetup_align); \ 576 VMLINUX_SYMBOL(__setup_start) = .; \ 577 *(.init.setup) \ 578 VMLINUX_SYMBOL(__setup_end) = .; 579 580 #define INITCALLS \ 581 *(.initcallearly.init) \ 582 VMLINUX_SYMBOL(__early_initcall_end) = .; \ 583 *(.initcall0.init) \ 584 *(.initcall0s.init) \ 585 *(.initcall1.init) \ 586 *(.initcall1s.init) \ 587 *(.initcall2.init) \ 588 *(.initcall2s.init) \ 589 *(.initcall3.init) \ 590 *(.initcall3s.init) \ 591 *(.initcall4.init) \ 592 *(.initcall4s.init) \ 593 *(.initcall5.init) \ 594 *(.initcall5s.init) \ 595 *(.initcallrootfs.init) \ 596 *(.initcall6.init) \ 597 *(.initcall6s.init) \ 598 *(.initcall7.init) \ 599 *(.initcall7s.init) 600 601 #define INIT_CALLS \ 602 VMLINUX_SYMBOL(__initcall_start) = .; \ 603 INITCALLS \ 604 VMLINUX_SYMBOL(__initcall_end) = .; 605 606 #define CON_INITCALL \ 607 VMLINUX_SYMBOL(__con_initcall_start) = .; \ 608 *(.con_initcall.init) \ 609 VMLINUX_SYMBOL(__con_initcall_end) = .; 610 611 #define SECURITY_INITCALL \ 612 VMLINUX_SYMBOL(__security_initcall_start) = .; \ 613 *(.security_initcall.init) \ 614 VMLINUX_SYMBOL(__security_initcall_end) = .; 615 616 #ifdef CONFIG_BLK_DEV_INITRD 617 #define INIT_RAM_FS \ 618 . = ALIGN(PAGE_SIZE); \ 619 VMLINUX_SYMBOL(__initramfs_start) = .; \ 620 *(.init.ramfs) \ 621 VMLINUX_SYMBOL(__initramfs_end) = .; 622 #else 623 #define INIT_RAM_FS 624 #endif 625 626 /* 627 * Default discarded sections. 628 * 629 * Some archs want to discard exit text/data at runtime rather than 630 * link time due to cross-section references such as alt instructions, 631 * bug table, eh_frame, etc. DISCARDS must be the last of output 632 * section definitions so that such archs put those in earlier section 633 * definitions. 634 */ 635 #define DISCARDS \ 636 /DISCARD/ : { \ 637 EXIT_TEXT \ 638 EXIT_DATA \ 639 EXIT_CALL \ 640 *(.discard) \ 641 } 642 643 /** 644 * PERCPU_VADDR - define output section for percpu area 645 * @vaddr: explicit base address (optional) 646 * @phdr: destination PHDR (optional) 647 * 648 * Macro which expands to output section for percpu area. If @vaddr 649 * is not blank, it specifies explicit base address and all percpu 650 * symbols will be offset from the given address. If blank, @vaddr 651 * always equals @laddr + LOAD_OFFSET. 652 * 653 * @phdr defines the output PHDR to use if not blank. Be warned that 654 * output PHDR is sticky. If @phdr is specified, the next output 655 * section in the linker script will go there too. @phdr should have 656 * a leading colon. 657 * 658 * Note that this macros defines __per_cpu_load as an absolute symbol. 659 * If there is no need to put the percpu section at a predetermined 660 * address, use PERCPU(). 661 */ 662 #define PERCPU_VADDR(vaddr, phdr) \ 663 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 664 .data.percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load) \ 665 - LOAD_OFFSET) { \ 666 VMLINUX_SYMBOL(__per_cpu_start) = .; \ 667 *(.data.percpu.first) \ 668 *(.data.percpu.page_aligned) \ 669 *(.data.percpu) \ 670 *(.data.percpu.shared_aligned) \ 671 VMLINUX_SYMBOL(__per_cpu_end) = .; \ 672 } phdr \ 673 . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data.percpu); 674 675 /** 676 * PERCPU - define output section for percpu area, simple version 677 * @align: required alignment 678 * 679 * Align to @align and outputs output section for percpu area. This 680 * macro doesn't maniuplate @vaddr or @phdr and __per_cpu_load and 681 * __per_cpu_start will be identical. 682 * 683 * This macro is equivalent to ALIGN(align); PERCPU_VADDR( , ) except 684 * that __per_cpu_load is defined as a relative symbol against 685 * .data.percpu which is required for relocatable x86_32 686 * configuration. 687 */ 688 #define PERCPU(align) \ 689 . = ALIGN(align); \ 690 .data.percpu : AT(ADDR(.data.percpu) - LOAD_OFFSET) { \ 691 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 692 VMLINUX_SYMBOL(__per_cpu_start) = .; \ 693 *(.data.percpu.first) \ 694 *(.data.percpu.page_aligned) \ 695 *(.data.percpu) \ 696 *(.data.percpu.shared_aligned) \ 697 VMLINUX_SYMBOL(__per_cpu_end) = .; \ 698 } 699 700 701 /* 702 * Definition of the high level *_SECTION macros 703 * They will fit only a subset of the architectures 704 */ 705 706 707 /* 708 * Writeable data. 709 * All sections are combined in a single .data section. 710 * The sections following CONSTRUCTORS are arranged so their 711 * typical alignment matches. 712 * A cacheline is typical/always less than a PAGE_SIZE so 713 * the sections that has this restriction (or similar) 714 * is located before the ones requiring PAGE_SIZE alignment. 715 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 716 * matches the requirment of PAGE_ALIGNED_DATA. 717 * 718 * use 0 as page_align if page_aligned data is not used */ 719 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \ 720 . = ALIGN(PAGE_SIZE); \ 721 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 722 INIT_TASK_DATA(inittask) \ 723 CACHELINE_ALIGNED_DATA(cacheline) \ 724 READ_MOSTLY_DATA(cacheline) \ 725 DATA_DATA \ 726 CONSTRUCTORS \ 727 NOSAVE_DATA \ 728 PAGE_ALIGNED_DATA(pagealigned) \ 729 } 730 731 #define INIT_TEXT_SECTION(inittext_align) \ 732 . = ALIGN(inittext_align); \ 733 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 734 VMLINUX_SYMBOL(_sinittext) = .; \ 735 INIT_TEXT \ 736 VMLINUX_SYMBOL(_einittext) = .; \ 737 } 738 739 #define INIT_DATA_SECTION(initsetup_align) \ 740 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 741 INIT_DATA \ 742 INIT_SETUP(initsetup_align) \ 743 INIT_CALLS \ 744 CON_INITCALL \ 745 SECURITY_INITCALL \ 746 INIT_RAM_FS \ 747 } 748 749 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 750 . = ALIGN(sbss_align); \ 751 VMLINUX_SYMBOL(__bss_start) = .; \ 752 SBSS(sbss_align) \ 753 BSS(bss_align) \ 754 . = ALIGN(stop_align); \ 755 VMLINUX_SYMBOL(__bss_stop) = .; 756