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 SYMBOL_PREFIX 56 #define VMLINUX_SYMBOL(sym) sym 57 #else 58 #define PASTE2(x,y) x##y 59 #define PASTE(x,y) PASTE2(x,y) 60 #define VMLINUX_SYMBOL(sym) PASTE(SYMBOL_PREFIX, sym) 61 #endif 62 63 /* Align . to a 8 byte boundary equals to maximum function alignment. */ 64 #define ALIGN_FUNCTION() . = ALIGN(8) 65 66 /* 67 * Align to a 32 byte boundary equal to the 68 * alignment gcc 4.5 uses for a struct 69 */ 70 #define STRUCT_ALIGN() . = ALIGN(32) 71 72 /* The actual configuration determine if the init/exit sections 73 * are handled as text/data or they can be discarded (which 74 * often happens at runtime) 75 */ 76 #ifdef CONFIG_HOTPLUG 77 #define DEV_KEEP(sec) *(.dev##sec) 78 #define DEV_DISCARD(sec) 79 #else 80 #define DEV_KEEP(sec) 81 #define DEV_DISCARD(sec) *(.dev##sec) 82 #endif 83 84 #ifdef CONFIG_HOTPLUG_CPU 85 #define CPU_KEEP(sec) *(.cpu##sec) 86 #define CPU_DISCARD(sec) 87 #else 88 #define CPU_KEEP(sec) 89 #define CPU_DISCARD(sec) *(.cpu##sec) 90 #endif 91 92 #if defined(CONFIG_MEMORY_HOTPLUG) 93 #define MEM_KEEP(sec) *(.mem##sec) 94 #define MEM_DISCARD(sec) 95 #else 96 #define MEM_KEEP(sec) 97 #define MEM_DISCARD(sec) *(.mem##sec) 98 #endif 99 100 #ifdef CONFIG_FTRACE_MCOUNT_RECORD 101 #define MCOUNT_REC() . = ALIGN(8); \ 102 VMLINUX_SYMBOL(__start_mcount_loc) = .; \ 103 *(__mcount_loc) \ 104 VMLINUX_SYMBOL(__stop_mcount_loc) = .; 105 #else 106 #define MCOUNT_REC() 107 #endif 108 109 #ifdef CONFIG_TRACE_BRANCH_PROFILING 110 #define LIKELY_PROFILE() VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \ 111 *(_ftrace_annotated_branch) \ 112 VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .; 113 #else 114 #define LIKELY_PROFILE() 115 #endif 116 117 #ifdef CONFIG_PROFILE_ALL_BRANCHES 118 #define BRANCH_PROFILE() VMLINUX_SYMBOL(__start_branch_profile) = .; \ 119 *(_ftrace_branch) \ 120 VMLINUX_SYMBOL(__stop_branch_profile) = .; 121 #else 122 #define BRANCH_PROFILE() 123 #endif 124 125 #ifdef CONFIG_EVENT_TRACING 126 #define FTRACE_EVENTS() VMLINUX_SYMBOL(__start_ftrace_events) = .; \ 127 *(_ftrace_events) \ 128 VMLINUX_SYMBOL(__stop_ftrace_events) = .; 129 #else 130 #define FTRACE_EVENTS() 131 #endif 132 133 #ifdef CONFIG_TRACING 134 #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .; \ 135 *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \ 136 VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .; 137 #else 138 #define TRACE_PRINTKS() 139 #endif 140 141 #ifdef CONFIG_FTRACE_SYSCALLS 142 #define TRACE_SYSCALLS() VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \ 143 *(__syscalls_metadata) \ 144 VMLINUX_SYMBOL(__stop_syscalls_metadata) = .; 145 #else 146 #define TRACE_SYSCALLS() 147 #endif 148 149 /* .data section */ 150 #define DATA_DATA \ 151 *(.data) \ 152 *(.ref.data) \ 153 DEV_KEEP(init.data) \ 154 DEV_KEEP(exit.data) \ 155 CPU_KEEP(init.data) \ 156 CPU_KEEP(exit.data) \ 157 MEM_KEEP(init.data) \ 158 MEM_KEEP(exit.data) \ 159 . = ALIGN(32); \ 160 VMLINUX_SYMBOL(__start___tracepoints) = .; \ 161 *(__tracepoints) \ 162 VMLINUX_SYMBOL(__stop___tracepoints) = .; \ 163 /* implement dynamic printk debug */ \ 164 . = ALIGN(8); \ 165 VMLINUX_SYMBOL(__start___verbose) = .; \ 166 *(__verbose) \ 167 VMLINUX_SYMBOL(__stop___verbose) = .; \ 168 LIKELY_PROFILE() \ 169 BRANCH_PROFILE() \ 170 TRACE_PRINTKS() \ 171 \ 172 STRUCT_ALIGN(); \ 173 FTRACE_EVENTS() \ 174 \ 175 STRUCT_ALIGN(); \ 176 TRACE_SYSCALLS() 177 178 /* 179 * Data section helpers 180 */ 181 #define NOSAVE_DATA \ 182 . = ALIGN(PAGE_SIZE); \ 183 VMLINUX_SYMBOL(__nosave_begin) = .; \ 184 *(.data..nosave) \ 185 . = ALIGN(PAGE_SIZE); \ 186 VMLINUX_SYMBOL(__nosave_end) = .; 187 188 #define PAGE_ALIGNED_DATA(page_align) \ 189 . = ALIGN(page_align); \ 190 *(.data..page_aligned) 191 192 #define READ_MOSTLY_DATA(align) \ 193 . = ALIGN(align); \ 194 *(.data..read_mostly) 195 196 #define CACHELINE_ALIGNED_DATA(align) \ 197 . = ALIGN(align); \ 198 *(.data..cacheline_aligned) 199 200 #define INIT_TASK_DATA(align) \ 201 . = ALIGN(align); \ 202 *(.data..init_task) 203 204 /* 205 * Read only Data 206 */ 207 #define RO_DATA_SECTION(align) \ 208 . = ALIGN((align)); \ 209 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 210 VMLINUX_SYMBOL(__start_rodata) = .; \ 211 *(.rodata) *(.rodata.*) \ 212 *(__vermagic) /* Kernel version magic */ \ 213 *(__markers_strings) /* Markers: strings */ \ 214 *(__tracepoints_strings)/* Tracepoints: strings */ \ 215 } \ 216 \ 217 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 218 *(.rodata1) \ 219 } \ 220 \ 221 BUG_TABLE \ 222 \ 223 /* PCI quirks */ \ 224 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 225 VMLINUX_SYMBOL(__start_pci_fixups_early) = .; \ 226 *(.pci_fixup_early) \ 227 VMLINUX_SYMBOL(__end_pci_fixups_early) = .; \ 228 VMLINUX_SYMBOL(__start_pci_fixups_header) = .; \ 229 *(.pci_fixup_header) \ 230 VMLINUX_SYMBOL(__end_pci_fixups_header) = .; \ 231 VMLINUX_SYMBOL(__start_pci_fixups_final) = .; \ 232 *(.pci_fixup_final) \ 233 VMLINUX_SYMBOL(__end_pci_fixups_final) = .; \ 234 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .; \ 235 *(.pci_fixup_enable) \ 236 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .; \ 237 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .; \ 238 *(.pci_fixup_resume) \ 239 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .; \ 240 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .; \ 241 *(.pci_fixup_resume_early) \ 242 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .; \ 243 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .; \ 244 *(.pci_fixup_suspend) \ 245 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .; \ 246 } \ 247 \ 248 /* Built-in firmware blobs */ \ 249 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \ 250 VMLINUX_SYMBOL(__start_builtin_fw) = .; \ 251 *(.builtin_fw) \ 252 VMLINUX_SYMBOL(__end_builtin_fw) = .; \ 253 } \ 254 \ 255 /* RapidIO route ops */ \ 256 .rio_ops : AT(ADDR(.rio_ops) - LOAD_OFFSET) { \ 257 VMLINUX_SYMBOL(__start_rio_switch_ops) = .; \ 258 *(.rio_switch_ops) \ 259 VMLINUX_SYMBOL(__end_rio_switch_ops) = .; \ 260 } \ 261 \ 262 TRACEDATA \ 263 \ 264 /* Kernel symbol table: Normal symbols */ \ 265 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 266 VMLINUX_SYMBOL(__start___ksymtab) = .; \ 267 *(__ksymtab) \ 268 VMLINUX_SYMBOL(__stop___ksymtab) = .; \ 269 } \ 270 \ 271 /* Kernel symbol table: GPL-only symbols */ \ 272 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 273 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .; \ 274 *(__ksymtab_gpl) \ 275 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .; \ 276 } \ 277 \ 278 /* Kernel symbol table: Normal unused symbols */ \ 279 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \ 280 VMLINUX_SYMBOL(__start___ksymtab_unused) = .; \ 281 *(__ksymtab_unused) \ 282 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .; \ 283 } \ 284 \ 285 /* Kernel symbol table: GPL-only unused symbols */ \ 286 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \ 287 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .; \ 288 *(__ksymtab_unused_gpl) \ 289 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .; \ 290 } \ 291 \ 292 /* Kernel symbol table: GPL-future-only symbols */ \ 293 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \ 294 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .; \ 295 *(__ksymtab_gpl_future) \ 296 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .; \ 297 } \ 298 \ 299 /* Kernel symbol table: Normal symbols */ \ 300 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 301 VMLINUX_SYMBOL(__start___kcrctab) = .; \ 302 *(__kcrctab) \ 303 VMLINUX_SYMBOL(__stop___kcrctab) = .; \ 304 } \ 305 \ 306 /* Kernel symbol table: GPL-only symbols */ \ 307 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 308 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .; \ 309 *(__kcrctab_gpl) \ 310 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .; \ 311 } \ 312 \ 313 /* Kernel symbol table: Normal unused symbols */ \ 314 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \ 315 VMLINUX_SYMBOL(__start___kcrctab_unused) = .; \ 316 *(__kcrctab_unused) \ 317 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .; \ 318 } \ 319 \ 320 /* Kernel symbol table: GPL-only unused symbols */ \ 321 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \ 322 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .; \ 323 *(__kcrctab_unused_gpl) \ 324 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .; \ 325 } \ 326 \ 327 /* Kernel symbol table: GPL-future-only symbols */ \ 328 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \ 329 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .; \ 330 *(__kcrctab_gpl_future) \ 331 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .; \ 332 } \ 333 \ 334 /* Kernel symbol table: strings */ \ 335 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 336 *(__ksymtab_strings) \ 337 } \ 338 \ 339 /* __*init sections */ \ 340 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 341 *(.ref.rodata) \ 342 DEV_KEEP(init.rodata) \ 343 DEV_KEEP(exit.rodata) \ 344 CPU_KEEP(init.rodata) \ 345 CPU_KEEP(exit.rodata) \ 346 MEM_KEEP(init.rodata) \ 347 MEM_KEEP(exit.rodata) \ 348 } \ 349 \ 350 /* Built-in module parameters. */ \ 351 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 352 VMLINUX_SYMBOL(__start___param) = .; \ 353 *(__param) \ 354 VMLINUX_SYMBOL(__stop___param) = .; \ 355 . = ALIGN((align)); \ 356 VMLINUX_SYMBOL(__end_rodata) = .; \ 357 } \ 358 . = ALIGN((align)); 359 360 /* RODATA & RO_DATA provided for backward compatibility. 361 * All archs are supposed to use RO_DATA() */ 362 #define RODATA RO_DATA_SECTION(4096) 363 #define RO_DATA(align) RO_DATA_SECTION(align) 364 365 #define SECURITY_INIT \ 366 .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \ 367 VMLINUX_SYMBOL(__security_initcall_start) = .; \ 368 *(.security_initcall.init) \ 369 VMLINUX_SYMBOL(__security_initcall_end) = .; \ 370 } 371 372 /* .text section. Map to function alignment to avoid address changes 373 * during second ld run in second ld pass when generating System.map */ 374 #define TEXT_TEXT \ 375 ALIGN_FUNCTION(); \ 376 *(.text.hot) \ 377 *(.text) \ 378 *(.ref.text) \ 379 DEV_KEEP(init.text) \ 380 DEV_KEEP(exit.text) \ 381 CPU_KEEP(init.text) \ 382 CPU_KEEP(exit.text) \ 383 MEM_KEEP(init.text) \ 384 MEM_KEEP(exit.text) \ 385 *(.text.unlikely) 386 387 388 /* sched.text is aling to function alignment to secure we have same 389 * address even at second ld pass when generating System.map */ 390 #define SCHED_TEXT \ 391 ALIGN_FUNCTION(); \ 392 VMLINUX_SYMBOL(__sched_text_start) = .; \ 393 *(.sched.text) \ 394 VMLINUX_SYMBOL(__sched_text_end) = .; 395 396 /* spinlock.text is aling to function alignment to secure we have same 397 * address even at second ld pass when generating System.map */ 398 #define LOCK_TEXT \ 399 ALIGN_FUNCTION(); \ 400 VMLINUX_SYMBOL(__lock_text_start) = .; \ 401 *(.spinlock.text) \ 402 VMLINUX_SYMBOL(__lock_text_end) = .; 403 404 #define KPROBES_TEXT \ 405 ALIGN_FUNCTION(); \ 406 VMLINUX_SYMBOL(__kprobes_text_start) = .; \ 407 *(.kprobes.text) \ 408 VMLINUX_SYMBOL(__kprobes_text_end) = .; 409 410 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 411 #define IRQENTRY_TEXT \ 412 ALIGN_FUNCTION(); \ 413 VMLINUX_SYMBOL(__irqentry_text_start) = .; \ 414 *(.irqentry.text) \ 415 VMLINUX_SYMBOL(__irqentry_text_end) = .; 416 #else 417 #define IRQENTRY_TEXT 418 #endif 419 420 /* Section used for early init (in .S files) */ 421 #define HEAD_TEXT *(.head.text) 422 423 #define HEAD_TEXT_SECTION \ 424 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 425 HEAD_TEXT \ 426 } 427 428 /* 429 * Exception table 430 */ 431 #define EXCEPTION_TABLE(align) \ 432 . = ALIGN(align); \ 433 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 434 VMLINUX_SYMBOL(__start___ex_table) = .; \ 435 *(__ex_table) \ 436 VMLINUX_SYMBOL(__stop___ex_table) = .; \ 437 } 438 439 /* 440 * Init task 441 */ 442 #define INIT_TASK_DATA_SECTION(align) \ 443 . = ALIGN(align); \ 444 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 445 INIT_TASK_DATA(align) \ 446 } 447 448 #ifdef CONFIG_CONSTRUCTORS 449 #define KERNEL_CTORS() . = ALIGN(8); \ 450 VMLINUX_SYMBOL(__ctors_start) = .; \ 451 *(.ctors) \ 452 VMLINUX_SYMBOL(__ctors_end) = .; 453 #else 454 #define KERNEL_CTORS() 455 #endif 456 457 /* init and exit section handling */ 458 #define INIT_DATA \ 459 *(.init.data) \ 460 DEV_DISCARD(init.data) \ 461 CPU_DISCARD(init.data) \ 462 MEM_DISCARD(init.data) \ 463 KERNEL_CTORS() \ 464 *(.init.rodata) \ 465 MCOUNT_REC() \ 466 DEV_DISCARD(init.rodata) \ 467 CPU_DISCARD(init.rodata) \ 468 MEM_DISCARD(init.rodata) 469 470 #define INIT_TEXT \ 471 *(.init.text) \ 472 DEV_DISCARD(init.text) \ 473 CPU_DISCARD(init.text) \ 474 MEM_DISCARD(init.text) 475 476 #define EXIT_DATA \ 477 *(.exit.data) \ 478 DEV_DISCARD(exit.data) \ 479 DEV_DISCARD(exit.rodata) \ 480 CPU_DISCARD(exit.data) \ 481 CPU_DISCARD(exit.rodata) \ 482 MEM_DISCARD(exit.data) \ 483 MEM_DISCARD(exit.rodata) 484 485 #define EXIT_TEXT \ 486 *(.exit.text) \ 487 DEV_DISCARD(exit.text) \ 488 CPU_DISCARD(exit.text) \ 489 MEM_DISCARD(exit.text) 490 491 #define EXIT_CALL \ 492 *(.exitcall.exit) 493 494 /* 495 * bss (Block Started by Symbol) - uninitialized data 496 * zeroed during startup 497 */ 498 #define SBSS(sbss_align) \ 499 . = ALIGN(sbss_align); \ 500 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 501 *(.sbss) \ 502 *(.scommon) \ 503 } 504 505 #define BSS(bss_align) \ 506 . = ALIGN(bss_align); \ 507 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 508 *(.bss..page_aligned) \ 509 *(.dynbss) \ 510 *(.bss) \ 511 *(COMMON) \ 512 } 513 514 /* 515 * DWARF debug sections. 516 * Symbols in the DWARF debugging sections are relative to 517 * the beginning of the section so we begin them at 0. 518 */ 519 #define DWARF_DEBUG \ 520 /* DWARF 1 */ \ 521 .debug 0 : { *(.debug) } \ 522 .line 0 : { *(.line) } \ 523 /* GNU DWARF 1 extensions */ \ 524 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 525 .debug_sfnames 0 : { *(.debug_sfnames) } \ 526 /* DWARF 1.1 and DWARF 2 */ \ 527 .debug_aranges 0 : { *(.debug_aranges) } \ 528 .debug_pubnames 0 : { *(.debug_pubnames) } \ 529 /* DWARF 2 */ \ 530 .debug_info 0 : { *(.debug_info \ 531 .gnu.linkonce.wi.*) } \ 532 .debug_abbrev 0 : { *(.debug_abbrev) } \ 533 .debug_line 0 : { *(.debug_line) } \ 534 .debug_frame 0 : { *(.debug_frame) } \ 535 .debug_str 0 : { *(.debug_str) } \ 536 .debug_loc 0 : { *(.debug_loc) } \ 537 .debug_macinfo 0 : { *(.debug_macinfo) } \ 538 /* SGI/MIPS DWARF 2 extensions */ \ 539 .debug_weaknames 0 : { *(.debug_weaknames) } \ 540 .debug_funcnames 0 : { *(.debug_funcnames) } \ 541 .debug_typenames 0 : { *(.debug_typenames) } \ 542 .debug_varnames 0 : { *(.debug_varnames) } \ 543 544 /* Stabs debugging sections. */ 545 #define STABS_DEBUG \ 546 .stab 0 : { *(.stab) } \ 547 .stabstr 0 : { *(.stabstr) } \ 548 .stab.excl 0 : { *(.stab.excl) } \ 549 .stab.exclstr 0 : { *(.stab.exclstr) } \ 550 .stab.index 0 : { *(.stab.index) } \ 551 .stab.indexstr 0 : { *(.stab.indexstr) } \ 552 .comment 0 : { *(.comment) } 553 554 #ifdef CONFIG_GENERIC_BUG 555 #define BUG_TABLE \ 556 . = ALIGN(8); \ 557 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 558 VMLINUX_SYMBOL(__start___bug_table) = .; \ 559 *(__bug_table) \ 560 VMLINUX_SYMBOL(__stop___bug_table) = .; \ 561 } 562 #else 563 #define BUG_TABLE 564 #endif 565 566 #ifdef CONFIG_PM_TRACE 567 #define TRACEDATA \ 568 . = ALIGN(4); \ 569 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 570 VMLINUX_SYMBOL(__tracedata_start) = .; \ 571 *(.tracedata) \ 572 VMLINUX_SYMBOL(__tracedata_end) = .; \ 573 } 574 #else 575 #define TRACEDATA 576 #endif 577 578 #define NOTES \ 579 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 580 VMLINUX_SYMBOL(__start_notes) = .; \ 581 *(.note.*) \ 582 VMLINUX_SYMBOL(__stop_notes) = .; \ 583 } 584 585 #define INIT_SETUP(initsetup_align) \ 586 . = ALIGN(initsetup_align); \ 587 VMLINUX_SYMBOL(__setup_start) = .; \ 588 *(.init.setup) \ 589 VMLINUX_SYMBOL(__setup_end) = .; 590 591 #define INITCALLS \ 592 *(.initcallearly.init) \ 593 VMLINUX_SYMBOL(__early_initcall_end) = .; \ 594 *(.initcall0.init) \ 595 *(.initcall0s.init) \ 596 *(.initcall1.init) \ 597 *(.initcall1s.init) \ 598 *(.initcall2.init) \ 599 *(.initcall2s.init) \ 600 *(.initcall3.init) \ 601 *(.initcall3s.init) \ 602 *(.initcall4.init) \ 603 *(.initcall4s.init) \ 604 *(.initcall5.init) \ 605 *(.initcall5s.init) \ 606 *(.initcallrootfs.init) \ 607 *(.initcall6.init) \ 608 *(.initcall6s.init) \ 609 *(.initcall7.init) \ 610 *(.initcall7s.init) 611 612 #define INIT_CALLS \ 613 VMLINUX_SYMBOL(__initcall_start) = .; \ 614 INITCALLS \ 615 VMLINUX_SYMBOL(__initcall_end) = .; 616 617 #define CON_INITCALL \ 618 VMLINUX_SYMBOL(__con_initcall_start) = .; \ 619 *(.con_initcall.init) \ 620 VMLINUX_SYMBOL(__con_initcall_end) = .; 621 622 #define SECURITY_INITCALL \ 623 VMLINUX_SYMBOL(__security_initcall_start) = .; \ 624 *(.security_initcall.init) \ 625 VMLINUX_SYMBOL(__security_initcall_end) = .; 626 627 #ifdef CONFIG_BLK_DEV_INITRD 628 #define INIT_RAM_FS \ 629 . = ALIGN(PAGE_SIZE); \ 630 VMLINUX_SYMBOL(__initramfs_start) = .; \ 631 *(.init.ramfs) \ 632 VMLINUX_SYMBOL(__initramfs_end) = .; 633 #else 634 #define INIT_RAM_FS 635 #endif 636 637 /* 638 * Default discarded sections. 639 * 640 * Some archs want to discard exit text/data at runtime rather than 641 * link time due to cross-section references such as alt instructions, 642 * bug table, eh_frame, etc. DISCARDS must be the last of output 643 * section definitions so that such archs put those in earlier section 644 * definitions. 645 */ 646 #define DISCARDS \ 647 /DISCARD/ : { \ 648 EXIT_TEXT \ 649 EXIT_DATA \ 650 EXIT_CALL \ 651 *(.discard) \ 652 *(.discard.*) \ 653 } 654 655 /** 656 * PERCPU_VADDR - define output section for percpu area 657 * @vaddr: explicit base address (optional) 658 * @phdr: destination PHDR (optional) 659 * 660 * Macro which expands to output section for percpu area. If @vaddr 661 * is not blank, it specifies explicit base address and all percpu 662 * symbols will be offset from the given address. If blank, @vaddr 663 * always equals @laddr + LOAD_OFFSET. 664 * 665 * @phdr defines the output PHDR to use if not blank. Be warned that 666 * output PHDR is sticky. If @phdr is specified, the next output 667 * section in the linker script will go there too. @phdr should have 668 * a leading colon. 669 * 670 * Note that this macros defines __per_cpu_load as an absolute symbol. 671 * If there is no need to put the percpu section at a predetermined 672 * address, use PERCPU(). 673 */ 674 #define PERCPU_VADDR(vaddr, phdr) \ 675 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 676 .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load) \ 677 - LOAD_OFFSET) { \ 678 VMLINUX_SYMBOL(__per_cpu_start) = .; \ 679 *(.data..percpu..first) \ 680 *(.data..percpu..page_aligned) \ 681 *(.data..percpu) \ 682 *(.data..percpu..shared_aligned) \ 683 VMLINUX_SYMBOL(__per_cpu_end) = .; \ 684 } phdr \ 685 . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu); 686 687 /** 688 * PERCPU - define output section for percpu area, simple version 689 * @align: required alignment 690 * 691 * Align to @align and outputs output section for percpu area. This 692 * macro doesn't maniuplate @vaddr or @phdr and __per_cpu_load and 693 * __per_cpu_start will be identical. 694 * 695 * This macro is equivalent to ALIGN(align); PERCPU_VADDR( , ) except 696 * that __per_cpu_load is defined as a relative symbol against 697 * .data..percpu which is required for relocatable x86_32 698 * configuration. 699 */ 700 #define PERCPU(align) \ 701 . = ALIGN(align); \ 702 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 703 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 704 VMLINUX_SYMBOL(__per_cpu_start) = .; \ 705 *(.data..percpu..first) \ 706 *(.data..percpu..page_aligned) \ 707 *(.data..percpu) \ 708 *(.data..percpu..shared_aligned) \ 709 VMLINUX_SYMBOL(__per_cpu_end) = .; \ 710 } 711 712 713 /* 714 * Definition of the high level *_SECTION macros 715 * They will fit only a subset of the architectures 716 */ 717 718 719 /* 720 * Writeable data. 721 * All sections are combined in a single .data section. 722 * The sections following CONSTRUCTORS are arranged so their 723 * typical alignment matches. 724 * A cacheline is typical/always less than a PAGE_SIZE so 725 * the sections that has this restriction (or similar) 726 * is located before the ones requiring PAGE_SIZE alignment. 727 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 728 * matches the requirment of PAGE_ALIGNED_DATA. 729 * 730 * use 0 as page_align if page_aligned data is not used */ 731 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \ 732 . = ALIGN(PAGE_SIZE); \ 733 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 734 INIT_TASK_DATA(inittask) \ 735 NOSAVE_DATA \ 736 PAGE_ALIGNED_DATA(pagealigned) \ 737 CACHELINE_ALIGNED_DATA(cacheline) \ 738 READ_MOSTLY_DATA(cacheline) \ 739 DATA_DATA \ 740 CONSTRUCTORS \ 741 } 742 743 #define INIT_TEXT_SECTION(inittext_align) \ 744 . = ALIGN(inittext_align); \ 745 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 746 VMLINUX_SYMBOL(_sinittext) = .; \ 747 INIT_TEXT \ 748 VMLINUX_SYMBOL(_einittext) = .; \ 749 } 750 751 #define INIT_DATA_SECTION(initsetup_align) \ 752 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 753 INIT_DATA \ 754 INIT_SETUP(initsetup_align) \ 755 INIT_CALLS \ 756 CON_INITCALL \ 757 SECURITY_INITCALL \ 758 INIT_RAM_FS \ 759 } 760 761 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 762 . = ALIGN(sbss_align); \ 763 VMLINUX_SYMBOL(__bss_start) = .; \ 764 SBSS(sbss_align) \ 765 BSS(bss_align) \ 766 . = ALIGN(stop_align); \ 767 VMLINUX_SYMBOL(__bss_stop) = .; 768