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() . = ALIGN(8); \ 92 VMLINUX_SYMBOL(__start_mcount_loc) = .; \ 93 *(__mcount_loc) \ 94 VMLINUX_SYMBOL(__stop_mcount_loc) = .; 95 #else 96 #define MCOUNT_REC() 97 #endif 98 99 #ifdef CONFIG_TRACE_BRANCH_PROFILING 100 #define LIKELY_PROFILE() VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \ 101 *(_ftrace_annotated_branch) \ 102 VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .; 103 #else 104 #define LIKELY_PROFILE() 105 #endif 106 107 #ifdef CONFIG_PROFILE_ALL_BRANCHES 108 #define BRANCH_PROFILE() VMLINUX_SYMBOL(__start_branch_profile) = .; \ 109 *(_ftrace_branch) \ 110 VMLINUX_SYMBOL(__stop_branch_profile) = .; 111 #else 112 #define BRANCH_PROFILE() 113 #endif 114 115 #ifdef CONFIG_EVENT_TRACING 116 #define FTRACE_EVENTS() VMLINUX_SYMBOL(__start_ftrace_events) = .; \ 117 *(_ftrace_events) \ 118 VMLINUX_SYMBOL(__stop_ftrace_events) = .; 119 #else 120 #define FTRACE_EVENTS() 121 #endif 122 123 #ifdef CONFIG_TRACING 124 #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .; \ 125 *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \ 126 VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .; 127 #else 128 #define TRACE_PRINTKS() 129 #endif 130 131 #ifdef CONFIG_FTRACE_SYSCALLS 132 #define TRACE_SYSCALLS() VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \ 133 *(__syscalls_metadata) \ 134 VMLINUX_SYMBOL(__stop_syscalls_metadata) = .; 135 #else 136 #define TRACE_SYSCALLS() 137 #endif 138 139 /* .data section */ 140 #define DATA_DATA \ 141 *(.data) \ 142 *(.ref.data) \ 143 DEV_KEEP(init.data) \ 144 DEV_KEEP(exit.data) \ 145 CPU_KEEP(init.data) \ 146 CPU_KEEP(exit.data) \ 147 MEM_KEEP(init.data) \ 148 MEM_KEEP(exit.data) \ 149 . = ALIGN(8); \ 150 VMLINUX_SYMBOL(__start___markers) = .; \ 151 *(__markers) \ 152 VMLINUX_SYMBOL(__stop___markers) = .; \ 153 . = ALIGN(32); \ 154 VMLINUX_SYMBOL(__start___tracepoints) = .; \ 155 *(__tracepoints) \ 156 VMLINUX_SYMBOL(__stop___tracepoints) = .; \ 157 /* implement dynamic printk debug */ \ 158 . = ALIGN(8); \ 159 VMLINUX_SYMBOL(__start___verbose) = .; \ 160 *(__verbose) \ 161 VMLINUX_SYMBOL(__stop___verbose) = .; \ 162 LIKELY_PROFILE() \ 163 BRANCH_PROFILE() \ 164 TRACE_PRINTKS() \ 165 FTRACE_EVENTS() \ 166 TRACE_SYSCALLS() 167 168 /* 169 * Data section helpers 170 */ 171 #define NOSAVE_DATA \ 172 . = ALIGN(PAGE_SIZE); \ 173 VMLINUX_SYMBOL(__nosave_begin) = .; \ 174 *(.data.nosave) \ 175 . = ALIGN(PAGE_SIZE); \ 176 VMLINUX_SYMBOL(__nosave_end) = .; 177 178 #define PAGE_ALIGNED_DATA(page_align) \ 179 . = ALIGN(page_align); \ 180 *(.data.page_aligned) 181 182 #define READ_MOSTLY_DATA(align) \ 183 . = ALIGN(align); \ 184 *(.data.read_mostly) 185 186 #define CACHELINE_ALIGNED_DATA(align) \ 187 . = ALIGN(align); \ 188 *(.data.cacheline_aligned) 189 190 #define INIT_TASK_DATA(align) \ 191 . = ALIGN(align); \ 192 *(.data.init_task) 193 194 /* 195 * Read only Data 196 */ 197 #define RO_DATA_SECTION(align) \ 198 . = ALIGN((align)); \ 199 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 200 VMLINUX_SYMBOL(__start_rodata) = .; \ 201 *(.rodata) *(.rodata.*) \ 202 *(__vermagic) /* Kernel version magic */ \ 203 *(__markers_strings) /* Markers: strings */ \ 204 *(__tracepoints_strings)/* Tracepoints: strings */ \ 205 } \ 206 \ 207 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 208 *(.rodata1) \ 209 } \ 210 \ 211 BUG_TABLE \ 212 \ 213 /* PCI quirks */ \ 214 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 215 VMLINUX_SYMBOL(__start_pci_fixups_early) = .; \ 216 *(.pci_fixup_early) \ 217 VMLINUX_SYMBOL(__end_pci_fixups_early) = .; \ 218 VMLINUX_SYMBOL(__start_pci_fixups_header) = .; \ 219 *(.pci_fixup_header) \ 220 VMLINUX_SYMBOL(__end_pci_fixups_header) = .; \ 221 VMLINUX_SYMBOL(__start_pci_fixups_final) = .; \ 222 *(.pci_fixup_final) \ 223 VMLINUX_SYMBOL(__end_pci_fixups_final) = .; \ 224 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .; \ 225 *(.pci_fixup_enable) \ 226 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .; \ 227 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .; \ 228 *(.pci_fixup_resume) \ 229 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .; \ 230 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .; \ 231 *(.pci_fixup_resume_early) \ 232 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .; \ 233 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .; \ 234 *(.pci_fixup_suspend) \ 235 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .; \ 236 } \ 237 \ 238 /* Built-in firmware blobs */ \ 239 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \ 240 VMLINUX_SYMBOL(__start_builtin_fw) = .; \ 241 *(.builtin_fw) \ 242 VMLINUX_SYMBOL(__end_builtin_fw) = .; \ 243 } \ 244 \ 245 /* RapidIO route ops */ \ 246 .rio_route : AT(ADDR(.rio_route) - LOAD_OFFSET) { \ 247 VMLINUX_SYMBOL(__start_rio_route_ops) = .; \ 248 *(.rio_route_ops) \ 249 VMLINUX_SYMBOL(__end_rio_route_ops) = .; \ 250 } \ 251 \ 252 TRACEDATA \ 253 \ 254 /* Kernel symbol table: Normal symbols */ \ 255 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 256 VMLINUX_SYMBOL(__start___ksymtab) = .; \ 257 *(__ksymtab) \ 258 VMLINUX_SYMBOL(__stop___ksymtab) = .; \ 259 } \ 260 \ 261 /* Kernel symbol table: GPL-only symbols */ \ 262 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 263 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .; \ 264 *(__ksymtab_gpl) \ 265 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .; \ 266 } \ 267 \ 268 /* Kernel symbol table: Normal unused symbols */ \ 269 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \ 270 VMLINUX_SYMBOL(__start___ksymtab_unused) = .; \ 271 *(__ksymtab_unused) \ 272 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .; \ 273 } \ 274 \ 275 /* Kernel symbol table: GPL-only unused symbols */ \ 276 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \ 277 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .; \ 278 *(__ksymtab_unused_gpl) \ 279 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .; \ 280 } \ 281 \ 282 /* Kernel symbol table: GPL-future-only symbols */ \ 283 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \ 284 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .; \ 285 *(__ksymtab_gpl_future) \ 286 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .; \ 287 } \ 288 \ 289 /* Kernel symbol table: Normal symbols */ \ 290 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 291 VMLINUX_SYMBOL(__start___kcrctab) = .; \ 292 *(__kcrctab) \ 293 VMLINUX_SYMBOL(__stop___kcrctab) = .; \ 294 } \ 295 \ 296 /* Kernel symbol table: GPL-only symbols */ \ 297 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 298 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .; \ 299 *(__kcrctab_gpl) \ 300 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .; \ 301 } \ 302 \ 303 /* Kernel symbol table: Normal unused symbols */ \ 304 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \ 305 VMLINUX_SYMBOL(__start___kcrctab_unused) = .; \ 306 *(__kcrctab_unused) \ 307 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .; \ 308 } \ 309 \ 310 /* Kernel symbol table: GPL-only unused symbols */ \ 311 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \ 312 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .; \ 313 *(__kcrctab_unused_gpl) \ 314 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .; \ 315 } \ 316 \ 317 /* Kernel symbol table: GPL-future-only symbols */ \ 318 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \ 319 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .; \ 320 *(__kcrctab_gpl_future) \ 321 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .; \ 322 } \ 323 \ 324 /* Kernel symbol table: strings */ \ 325 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 326 *(__ksymtab_strings) \ 327 } \ 328 \ 329 /* __*init sections */ \ 330 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 331 *(.ref.rodata) \ 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 MCOUNT_REC() \ 456 DEV_DISCARD(init.rodata) \ 457 CPU_DISCARD(init.rodata) \ 458 MEM_DISCARD(init.rodata) 459 460 #define INIT_TEXT \ 461 *(.init.text) \ 462 DEV_DISCARD(init.text) \ 463 CPU_DISCARD(init.text) \ 464 MEM_DISCARD(init.text) 465 466 #define EXIT_DATA \ 467 *(.exit.data) \ 468 DEV_DISCARD(exit.data) \ 469 DEV_DISCARD(exit.rodata) \ 470 CPU_DISCARD(exit.data) \ 471 CPU_DISCARD(exit.rodata) \ 472 MEM_DISCARD(exit.data) \ 473 MEM_DISCARD(exit.rodata) 474 475 #define EXIT_TEXT \ 476 *(.exit.text) \ 477 DEV_DISCARD(exit.text) \ 478 CPU_DISCARD(exit.text) \ 479 MEM_DISCARD(exit.text) 480 481 #define EXIT_CALL \ 482 *(.exitcall.exit) 483 484 /* 485 * bss (Block Started by Symbol) - uninitialized data 486 * zeroed during startup 487 */ 488 #define SBSS(sbss_align) \ 489 . = ALIGN(sbss_align); \ 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 *(.bss.page_aligned) \ 499 *(.dynbss) \ 500 *(.bss) \ 501 *(COMMON) \ 502 } 503 504 /* 505 * DWARF debug sections. 506 * Symbols in the DWARF debugging sections are relative to 507 * the beginning of the section so we begin them at 0. 508 */ 509 #define DWARF_DEBUG \ 510 /* DWARF 1 */ \ 511 .debug 0 : { *(.debug) } \ 512 .line 0 : { *(.line) } \ 513 /* GNU DWARF 1 extensions */ \ 514 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 515 .debug_sfnames 0 : { *(.debug_sfnames) } \ 516 /* DWARF 1.1 and DWARF 2 */ \ 517 .debug_aranges 0 : { *(.debug_aranges) } \ 518 .debug_pubnames 0 : { *(.debug_pubnames) } \ 519 /* DWARF 2 */ \ 520 .debug_info 0 : { *(.debug_info \ 521 .gnu.linkonce.wi.*) } \ 522 .debug_abbrev 0 : { *(.debug_abbrev) } \ 523 .debug_line 0 : { *(.debug_line) } \ 524 .debug_frame 0 : { *(.debug_frame) } \ 525 .debug_str 0 : { *(.debug_str) } \ 526 .debug_loc 0 : { *(.debug_loc) } \ 527 .debug_macinfo 0 : { *(.debug_macinfo) } \ 528 /* SGI/MIPS DWARF 2 extensions */ \ 529 .debug_weaknames 0 : { *(.debug_weaknames) } \ 530 .debug_funcnames 0 : { *(.debug_funcnames) } \ 531 .debug_typenames 0 : { *(.debug_typenames) } \ 532 .debug_varnames 0 : { *(.debug_varnames) } \ 533 534 /* Stabs debugging sections. */ 535 #define STABS_DEBUG \ 536 .stab 0 : { *(.stab) } \ 537 .stabstr 0 : { *(.stabstr) } \ 538 .stab.excl 0 : { *(.stab.excl) } \ 539 .stab.exclstr 0 : { *(.stab.exclstr) } \ 540 .stab.index 0 : { *(.stab.index) } \ 541 .stab.indexstr 0 : { *(.stab.indexstr) } \ 542 .comment 0 : { *(.comment) } 543 544 #ifdef CONFIG_GENERIC_BUG 545 #define BUG_TABLE \ 546 . = ALIGN(8); \ 547 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 548 VMLINUX_SYMBOL(__start___bug_table) = .; \ 549 *(__bug_table) \ 550 VMLINUX_SYMBOL(__stop___bug_table) = .; \ 551 } 552 #else 553 #define BUG_TABLE 554 #endif 555 556 #ifdef CONFIG_PM_TRACE 557 #define TRACEDATA \ 558 . = ALIGN(4); \ 559 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 560 VMLINUX_SYMBOL(__tracedata_start) = .; \ 561 *(.tracedata) \ 562 VMLINUX_SYMBOL(__tracedata_end) = .; \ 563 } 564 #else 565 #define TRACEDATA 566 #endif 567 568 #define NOTES \ 569 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 570 VMLINUX_SYMBOL(__start_notes) = .; \ 571 *(.note.*) \ 572 VMLINUX_SYMBOL(__stop_notes) = .; \ 573 } 574 575 #define INIT_SETUP(initsetup_align) \ 576 . = ALIGN(initsetup_align); \ 577 VMLINUX_SYMBOL(__setup_start) = .; \ 578 *(.init.setup) \ 579 VMLINUX_SYMBOL(__setup_end) = .; 580 581 #define INITCALLS \ 582 *(.initcallearly.init) \ 583 VMLINUX_SYMBOL(__early_initcall_end) = .; \ 584 *(.initcall0.init) \ 585 *(.initcall0s.init) \ 586 *(.initcall1.init) \ 587 *(.initcall1s.init) \ 588 *(.initcall2.init) \ 589 *(.initcall2s.init) \ 590 *(.initcall3.init) \ 591 *(.initcall3s.init) \ 592 *(.initcall4.init) \ 593 *(.initcall4s.init) \ 594 *(.initcall5.init) \ 595 *(.initcall5s.init) \ 596 *(.initcallrootfs.init) \ 597 *(.initcall6.init) \ 598 *(.initcall6s.init) \ 599 *(.initcall7.init) \ 600 *(.initcall7s.init) 601 602 #define INIT_CALLS \ 603 VMLINUX_SYMBOL(__initcall_start) = .; \ 604 INITCALLS \ 605 VMLINUX_SYMBOL(__initcall_end) = .; 606 607 #define CON_INITCALL \ 608 VMLINUX_SYMBOL(__con_initcall_start) = .; \ 609 *(.con_initcall.init) \ 610 VMLINUX_SYMBOL(__con_initcall_end) = .; 611 612 #define SECURITY_INITCALL \ 613 VMLINUX_SYMBOL(__security_initcall_start) = .; \ 614 *(.security_initcall.init) \ 615 VMLINUX_SYMBOL(__security_initcall_end) = .; 616 617 #ifdef CONFIG_BLK_DEV_INITRD 618 #define INIT_RAM_FS \ 619 . = ALIGN(PAGE_SIZE); \ 620 VMLINUX_SYMBOL(__initramfs_start) = .; \ 621 *(.init.ramfs) \ 622 VMLINUX_SYMBOL(__initramfs_end) = .; 623 #else 624 #define INIT_RAM_FS 625 #endif 626 627 /* 628 * Default discarded sections. 629 * 630 * Some archs want to discard exit text/data at runtime rather than 631 * link time due to cross-section references such as alt instructions, 632 * bug table, eh_frame, etc. DISCARDS must be the last of output 633 * section definitions so that such archs put those in earlier section 634 * definitions. 635 */ 636 #define DISCARDS \ 637 /DISCARD/ : { \ 638 EXIT_TEXT \ 639 EXIT_DATA \ 640 EXIT_CALL \ 641 *(.discard) \ 642 } 643 644 /** 645 * PERCPU_VADDR - define output section for percpu area 646 * @vaddr: explicit base address (optional) 647 * @phdr: destination PHDR (optional) 648 * 649 * Macro which expands to output section for percpu area. If @vaddr 650 * is not blank, it specifies explicit base address and all percpu 651 * symbols will be offset from the given address. If blank, @vaddr 652 * always equals @laddr + LOAD_OFFSET. 653 * 654 * @phdr defines the output PHDR to use if not blank. Be warned that 655 * output PHDR is sticky. If @phdr is specified, the next output 656 * section in the linker script will go there too. @phdr should have 657 * a leading colon. 658 * 659 * Note that this macros defines __per_cpu_load as an absolute symbol. 660 * If there is no need to put the percpu section at a predetermined 661 * address, use PERCPU(). 662 */ 663 #define PERCPU_VADDR(vaddr, phdr) \ 664 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 665 .data.percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load) \ 666 - LOAD_OFFSET) { \ 667 VMLINUX_SYMBOL(__per_cpu_start) = .; \ 668 *(.data.percpu.first) \ 669 *(.data.percpu.page_aligned) \ 670 *(.data.percpu) \ 671 *(.data.percpu.shared_aligned) \ 672 VMLINUX_SYMBOL(__per_cpu_end) = .; \ 673 } phdr \ 674 . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data.percpu); 675 676 /** 677 * PERCPU - define output section for percpu area, simple version 678 * @align: required alignment 679 * 680 * Align to @align and outputs output section for percpu area. This 681 * macro doesn't maniuplate @vaddr or @phdr and __per_cpu_load and 682 * __per_cpu_start will be identical. 683 * 684 * This macro is equivalent to ALIGN(align); PERCPU_VADDR( , ) except 685 * that __per_cpu_load is defined as a relative symbol against 686 * .data.percpu which is required for relocatable x86_32 687 * configuration. 688 */ 689 #define PERCPU(align) \ 690 . = ALIGN(align); \ 691 .data.percpu : AT(ADDR(.data.percpu) - LOAD_OFFSET) { \ 692 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 693 VMLINUX_SYMBOL(__per_cpu_start) = .; \ 694 *(.data.percpu.first) \ 695 *(.data.percpu.page_aligned) \ 696 *(.data.percpu) \ 697 *(.data.percpu.shared_aligned) \ 698 VMLINUX_SYMBOL(__per_cpu_end) = .; \ 699 } 700 701 702 /* 703 * Definition of the high level *_SECTION macros 704 * They will fit only a subset of the architectures 705 */ 706 707 708 /* 709 * Writeable data. 710 * All sections are combined in a single .data section. 711 * The sections following CONSTRUCTORS are arranged so their 712 * typical alignment matches. 713 * A cacheline is typical/always less than a PAGE_SIZE so 714 * the sections that has this restriction (or similar) 715 * is located before the ones requiring PAGE_SIZE alignment. 716 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 717 * matches the requirment of PAGE_ALIGNED_DATA. 718 * 719 * use 0 as page_align if page_aligned data is not used */ 720 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \ 721 . = ALIGN(PAGE_SIZE); \ 722 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 723 INIT_TASK_DATA(inittask) \ 724 NOSAVE_DATA \ 725 PAGE_ALIGNED_DATA(pagealigned) \ 726 CACHELINE_ALIGNED_DATA(cacheline) \ 727 READ_MOSTLY_DATA(cacheline) \ 728 DATA_DATA \ 729 CONSTRUCTORS \ 730 } 731 732 #define INIT_TEXT_SECTION(inittext_align) \ 733 . = ALIGN(inittext_align); \ 734 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 735 VMLINUX_SYMBOL(_sinittext) = .; \ 736 INIT_TEXT \ 737 VMLINUX_SYMBOL(_einittext) = .; \ 738 } 739 740 #define INIT_DATA_SECTION(initsetup_align) \ 741 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 742 INIT_DATA \ 743 INIT_SETUP(initsetup_align) \ 744 INIT_CALLS \ 745 CON_INITCALL \ 746 SECURITY_INITCALL \ 747 INIT_RAM_FS \ 748 } 749 750 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 751 . = ALIGN(sbss_align); \ 752 VMLINUX_SYMBOL(__bss_start) = .; \ 753 SBSS(sbss_align) \ 754 BSS(bss_align) \ 755 . = ALIGN(stop_align); \ 756 VMLINUX_SYMBOL(__bss_stop) = .; 757