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 VMLINUX_SYMBOL(__start_ftrace_enum_maps) = .; \ 129 *(_ftrace_enum_map) \ 130 VMLINUX_SYMBOL(__stop_ftrace_enum_maps) = .; 131 #else 132 #define FTRACE_EVENTS() 133 #endif 134 135 #ifdef CONFIG_TRACING 136 #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .; \ 137 *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \ 138 VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .; 139 #define TRACEPOINT_STR() VMLINUX_SYMBOL(__start___tracepoint_str) = .; \ 140 *(__tracepoint_str) /* Trace_printk fmt' pointer */ \ 141 VMLINUX_SYMBOL(__stop___tracepoint_str) = .; 142 #else 143 #define TRACE_PRINTKS() 144 #define TRACEPOINT_STR() 145 #endif 146 147 #ifdef CONFIG_FTRACE_SYSCALLS 148 #define TRACE_SYSCALLS() . = ALIGN(8); \ 149 VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \ 150 *(__syscalls_metadata) \ 151 VMLINUX_SYMBOL(__stop_syscalls_metadata) = .; 152 #else 153 #define TRACE_SYSCALLS() 154 #endif 155 156 #ifdef CONFIG_SERIAL_EARLYCON 157 #define EARLYCON_TABLE() STRUCT_ALIGN(); \ 158 VMLINUX_SYMBOL(__earlycon_table) = .; \ 159 *(__earlycon_table) \ 160 *(__earlycon_table_end) 161 #else 162 #define EARLYCON_TABLE() 163 #endif 164 165 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name) 166 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name) 167 #define OF_TABLE(cfg, name) __OF_TABLE(config_enabled(cfg), name) 168 #define _OF_TABLE_0(name) 169 #define _OF_TABLE_1(name) \ 170 . = ALIGN(8); \ 171 VMLINUX_SYMBOL(__##name##_of_table) = .; \ 172 *(__##name##_of_table) \ 173 *(__##name##_of_table_end) 174 175 #define CLKSRC_OF_TABLES() OF_TABLE(CONFIG_CLKSRC_OF, clksrc) 176 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip) 177 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk) 178 #define IOMMU_OF_TABLES() OF_TABLE(CONFIG_OF_IOMMU, iommu) 179 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem) 180 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method) 181 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method) 182 #define EARLYCON_OF_TABLES() OF_TABLE(CONFIG_SERIAL_EARLYCON, earlycon) 183 184 #define KERNEL_DTB() \ 185 STRUCT_ALIGN(); \ 186 VMLINUX_SYMBOL(__dtb_start) = .; \ 187 *(.dtb.init.rodata) \ 188 VMLINUX_SYMBOL(__dtb_end) = .; 189 190 /* .data section */ 191 #define DATA_DATA \ 192 *(.data) \ 193 *(.ref.data) \ 194 *(.data..shared_aligned) /* percpu related */ \ 195 MEM_KEEP(init.data) \ 196 MEM_KEEP(exit.data) \ 197 *(.data.unlikely) \ 198 STRUCT_ALIGN(); \ 199 *(__tracepoints) \ 200 /* implement dynamic printk debug */ \ 201 . = ALIGN(8); \ 202 VMLINUX_SYMBOL(__start___jump_table) = .; \ 203 *(__jump_table) \ 204 VMLINUX_SYMBOL(__stop___jump_table) = .; \ 205 . = ALIGN(8); \ 206 VMLINUX_SYMBOL(__start___verbose) = .; \ 207 *(__verbose) \ 208 VMLINUX_SYMBOL(__stop___verbose) = .; \ 209 LIKELY_PROFILE() \ 210 BRANCH_PROFILE() \ 211 TRACE_PRINTKS() \ 212 TRACEPOINT_STR() 213 214 /* 215 * Data section helpers 216 */ 217 #define NOSAVE_DATA \ 218 . = ALIGN(PAGE_SIZE); \ 219 VMLINUX_SYMBOL(__nosave_begin) = .; \ 220 *(.data..nosave) \ 221 . = ALIGN(PAGE_SIZE); \ 222 VMLINUX_SYMBOL(__nosave_end) = .; 223 224 #define PAGE_ALIGNED_DATA(page_align) \ 225 . = ALIGN(page_align); \ 226 *(.data..page_aligned) 227 228 #define READ_MOSTLY_DATA(align) \ 229 . = ALIGN(align); \ 230 *(.data..read_mostly) \ 231 . = ALIGN(align); 232 233 #define CACHELINE_ALIGNED_DATA(align) \ 234 . = ALIGN(align); \ 235 *(.data..cacheline_aligned) 236 237 #define INIT_TASK_DATA(align) \ 238 . = ALIGN(align); \ 239 *(.data..init_task) 240 241 /* 242 * Read only Data 243 */ 244 #define RO_DATA_SECTION(align) \ 245 . = ALIGN((align)); \ 246 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 247 VMLINUX_SYMBOL(__start_rodata) = .; \ 248 *(.rodata) *(.rodata.*) \ 249 *(__vermagic) /* Kernel version magic */ \ 250 . = ALIGN(8); \ 251 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .; \ 252 *(__tracepoints_ptrs) /* Tracepoints: pointer array */\ 253 VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .; \ 254 *(__tracepoints_strings)/* Tracepoints: strings */ \ 255 } \ 256 \ 257 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 258 *(.rodata1) \ 259 } \ 260 \ 261 BUG_TABLE \ 262 \ 263 /* PCI quirks */ \ 264 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 265 VMLINUX_SYMBOL(__start_pci_fixups_early) = .; \ 266 *(.pci_fixup_early) \ 267 VMLINUX_SYMBOL(__end_pci_fixups_early) = .; \ 268 VMLINUX_SYMBOL(__start_pci_fixups_header) = .; \ 269 *(.pci_fixup_header) \ 270 VMLINUX_SYMBOL(__end_pci_fixups_header) = .; \ 271 VMLINUX_SYMBOL(__start_pci_fixups_final) = .; \ 272 *(.pci_fixup_final) \ 273 VMLINUX_SYMBOL(__end_pci_fixups_final) = .; \ 274 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .; \ 275 *(.pci_fixup_enable) \ 276 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .; \ 277 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .; \ 278 *(.pci_fixup_resume) \ 279 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .; \ 280 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .; \ 281 *(.pci_fixup_resume_early) \ 282 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .; \ 283 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .; \ 284 *(.pci_fixup_suspend) \ 285 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .; \ 286 VMLINUX_SYMBOL(__start_pci_fixups_suspend_late) = .; \ 287 *(.pci_fixup_suspend_late) \ 288 VMLINUX_SYMBOL(__end_pci_fixups_suspend_late) = .; \ 289 } \ 290 \ 291 /* Built-in firmware blobs */ \ 292 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \ 293 VMLINUX_SYMBOL(__start_builtin_fw) = .; \ 294 *(.builtin_fw) \ 295 VMLINUX_SYMBOL(__end_builtin_fw) = .; \ 296 } \ 297 \ 298 TRACEDATA \ 299 \ 300 /* Kernel symbol table: Normal symbols */ \ 301 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 302 VMLINUX_SYMBOL(__start___ksymtab) = .; \ 303 *(SORT(___ksymtab+*)) \ 304 VMLINUX_SYMBOL(__stop___ksymtab) = .; \ 305 } \ 306 \ 307 /* Kernel symbol table: GPL-only symbols */ \ 308 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 309 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .; \ 310 *(SORT(___ksymtab_gpl+*)) \ 311 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .; \ 312 } \ 313 \ 314 /* Kernel symbol table: Normal unused symbols */ \ 315 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \ 316 VMLINUX_SYMBOL(__start___ksymtab_unused) = .; \ 317 *(SORT(___ksymtab_unused+*)) \ 318 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .; \ 319 } \ 320 \ 321 /* Kernel symbol table: GPL-only unused symbols */ \ 322 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \ 323 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .; \ 324 *(SORT(___ksymtab_unused_gpl+*)) \ 325 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .; \ 326 } \ 327 \ 328 /* Kernel symbol table: GPL-future-only symbols */ \ 329 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \ 330 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .; \ 331 *(SORT(___ksymtab_gpl_future+*)) \ 332 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .; \ 333 } \ 334 \ 335 /* Kernel symbol table: Normal symbols */ \ 336 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 337 VMLINUX_SYMBOL(__start___kcrctab) = .; \ 338 *(SORT(___kcrctab+*)) \ 339 VMLINUX_SYMBOL(__stop___kcrctab) = .; \ 340 } \ 341 \ 342 /* Kernel symbol table: GPL-only symbols */ \ 343 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 344 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .; \ 345 *(SORT(___kcrctab_gpl+*)) \ 346 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .; \ 347 } \ 348 \ 349 /* Kernel symbol table: Normal unused symbols */ \ 350 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \ 351 VMLINUX_SYMBOL(__start___kcrctab_unused) = .; \ 352 *(SORT(___kcrctab_unused+*)) \ 353 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .; \ 354 } \ 355 \ 356 /* Kernel symbol table: GPL-only unused symbols */ \ 357 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \ 358 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .; \ 359 *(SORT(___kcrctab_unused_gpl+*)) \ 360 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .; \ 361 } \ 362 \ 363 /* Kernel symbol table: GPL-future-only symbols */ \ 364 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \ 365 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .; \ 366 *(SORT(___kcrctab_gpl_future+*)) \ 367 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .; \ 368 } \ 369 \ 370 /* Kernel symbol table: strings */ \ 371 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 372 *(__ksymtab_strings) \ 373 } \ 374 \ 375 /* __*init sections */ \ 376 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 377 *(.ref.rodata) \ 378 MEM_KEEP(init.rodata) \ 379 MEM_KEEP(exit.rodata) \ 380 } \ 381 \ 382 /* Built-in module parameters. */ \ 383 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 384 VMLINUX_SYMBOL(__start___param) = .; \ 385 *(__param) \ 386 VMLINUX_SYMBOL(__stop___param) = .; \ 387 } \ 388 \ 389 /* Built-in module versions. */ \ 390 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 391 VMLINUX_SYMBOL(__start___modver) = .; \ 392 *(__modver) \ 393 VMLINUX_SYMBOL(__stop___modver) = .; \ 394 . = ALIGN((align)); \ 395 VMLINUX_SYMBOL(__end_rodata) = .; \ 396 } \ 397 . = ALIGN((align)); 398 399 /* RODATA & RO_DATA provided for backward compatibility. 400 * All archs are supposed to use RO_DATA() */ 401 #define RODATA RO_DATA_SECTION(4096) 402 #define RO_DATA(align) RO_DATA_SECTION(align) 403 404 #define SECURITY_INIT \ 405 .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \ 406 VMLINUX_SYMBOL(__security_initcall_start) = .; \ 407 *(.security_initcall.init) \ 408 VMLINUX_SYMBOL(__security_initcall_end) = .; \ 409 } 410 411 /* .text section. Map to function alignment to avoid address changes 412 * during second ld run in second ld pass when generating System.map */ 413 #define TEXT_TEXT \ 414 ALIGN_FUNCTION(); \ 415 *(.text.hot .text .text.fixup .text.unlikely) \ 416 *(.ref.text) \ 417 MEM_KEEP(init.text) \ 418 MEM_KEEP(exit.text) \ 419 420 421 /* sched.text is aling to function alignment to secure we have same 422 * address even at second ld pass when generating System.map */ 423 #define SCHED_TEXT \ 424 ALIGN_FUNCTION(); \ 425 VMLINUX_SYMBOL(__sched_text_start) = .; \ 426 *(.sched.text) \ 427 VMLINUX_SYMBOL(__sched_text_end) = .; 428 429 /* spinlock.text is aling to function alignment to secure we have same 430 * address even at second ld pass when generating System.map */ 431 #define LOCK_TEXT \ 432 ALIGN_FUNCTION(); \ 433 VMLINUX_SYMBOL(__lock_text_start) = .; \ 434 *(.spinlock.text) \ 435 VMLINUX_SYMBOL(__lock_text_end) = .; 436 437 #define KPROBES_TEXT \ 438 ALIGN_FUNCTION(); \ 439 VMLINUX_SYMBOL(__kprobes_text_start) = .; \ 440 *(.kprobes.text) \ 441 VMLINUX_SYMBOL(__kprobes_text_end) = .; 442 443 #define ENTRY_TEXT \ 444 ALIGN_FUNCTION(); \ 445 VMLINUX_SYMBOL(__entry_text_start) = .; \ 446 *(.entry.text) \ 447 VMLINUX_SYMBOL(__entry_text_end) = .; 448 449 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 450 #define IRQENTRY_TEXT \ 451 ALIGN_FUNCTION(); \ 452 VMLINUX_SYMBOL(__irqentry_text_start) = .; \ 453 *(.irqentry.text) \ 454 VMLINUX_SYMBOL(__irqentry_text_end) = .; 455 #else 456 #define IRQENTRY_TEXT 457 #endif 458 459 /* Section used for early init (in .S files) */ 460 #define HEAD_TEXT *(.head.text) 461 462 #define HEAD_TEXT_SECTION \ 463 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 464 HEAD_TEXT \ 465 } 466 467 /* 468 * Exception table 469 */ 470 #define EXCEPTION_TABLE(align) \ 471 . = ALIGN(align); \ 472 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 473 VMLINUX_SYMBOL(__start___ex_table) = .; \ 474 *(__ex_table) \ 475 VMLINUX_SYMBOL(__stop___ex_table) = .; \ 476 } 477 478 /* 479 * Init task 480 */ 481 #define INIT_TASK_DATA_SECTION(align) \ 482 . = ALIGN(align); \ 483 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 484 INIT_TASK_DATA(align) \ 485 } 486 487 #ifdef CONFIG_CONSTRUCTORS 488 #define KERNEL_CTORS() . = ALIGN(8); \ 489 VMLINUX_SYMBOL(__ctors_start) = .; \ 490 *(.ctors) \ 491 *(SORT(.init_array.*)) \ 492 *(.init_array) \ 493 VMLINUX_SYMBOL(__ctors_end) = .; 494 #else 495 #define KERNEL_CTORS() 496 #endif 497 498 /* init and exit section handling */ 499 #define INIT_DATA \ 500 *(.init.data) \ 501 MEM_DISCARD(init.data) \ 502 KERNEL_CTORS() \ 503 MCOUNT_REC() \ 504 *(.init.rodata) \ 505 FTRACE_EVENTS() \ 506 TRACE_SYSCALLS() \ 507 KPROBE_BLACKLIST() \ 508 MEM_DISCARD(init.rodata) \ 509 CLK_OF_TABLES() \ 510 RESERVEDMEM_OF_TABLES() \ 511 CLKSRC_OF_TABLES() \ 512 IOMMU_OF_TABLES() \ 513 CPU_METHOD_OF_TABLES() \ 514 CPUIDLE_METHOD_OF_TABLES() \ 515 KERNEL_DTB() \ 516 IRQCHIP_OF_MATCH_TABLE() \ 517 EARLYCON_TABLE() \ 518 EARLYCON_OF_TABLES() 519 520 #define INIT_TEXT \ 521 *(.init.text) \ 522 MEM_DISCARD(init.text) 523 524 #define EXIT_DATA \ 525 *(.exit.data) \ 526 MEM_DISCARD(exit.data) \ 527 MEM_DISCARD(exit.rodata) 528 529 #define EXIT_TEXT \ 530 *(.exit.text) \ 531 MEM_DISCARD(exit.text) 532 533 #define EXIT_CALL \ 534 *(.exitcall.exit) 535 536 /* 537 * bss (Block Started by Symbol) - uninitialized data 538 * zeroed during startup 539 */ 540 #define SBSS(sbss_align) \ 541 . = ALIGN(sbss_align); \ 542 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 543 *(.sbss) \ 544 *(.scommon) \ 545 } 546 547 /* 548 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 549 * sections to the front of bss. 550 */ 551 #ifndef BSS_FIRST_SECTIONS 552 #define BSS_FIRST_SECTIONS 553 #endif 554 555 #define BSS(bss_align) \ 556 . = ALIGN(bss_align); \ 557 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 558 BSS_FIRST_SECTIONS \ 559 *(.bss..page_aligned) \ 560 *(.dynbss) \ 561 *(.bss) \ 562 *(COMMON) \ 563 } 564 565 /* 566 * DWARF debug sections. 567 * Symbols in the DWARF debugging sections are relative to 568 * the beginning of the section so we begin them at 0. 569 */ 570 #define DWARF_DEBUG \ 571 /* DWARF 1 */ \ 572 .debug 0 : { *(.debug) } \ 573 .line 0 : { *(.line) } \ 574 /* GNU DWARF 1 extensions */ \ 575 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 576 .debug_sfnames 0 : { *(.debug_sfnames) } \ 577 /* DWARF 1.1 and DWARF 2 */ \ 578 .debug_aranges 0 : { *(.debug_aranges) } \ 579 .debug_pubnames 0 : { *(.debug_pubnames) } \ 580 /* DWARF 2 */ \ 581 .debug_info 0 : { *(.debug_info \ 582 .gnu.linkonce.wi.*) } \ 583 .debug_abbrev 0 : { *(.debug_abbrev) } \ 584 .debug_line 0 : { *(.debug_line) } \ 585 .debug_frame 0 : { *(.debug_frame) } \ 586 .debug_str 0 : { *(.debug_str) } \ 587 .debug_loc 0 : { *(.debug_loc) } \ 588 .debug_macinfo 0 : { *(.debug_macinfo) } \ 589 /* SGI/MIPS DWARF 2 extensions */ \ 590 .debug_weaknames 0 : { *(.debug_weaknames) } \ 591 .debug_funcnames 0 : { *(.debug_funcnames) } \ 592 .debug_typenames 0 : { *(.debug_typenames) } \ 593 .debug_varnames 0 : { *(.debug_varnames) } \ 594 595 /* Stabs debugging sections. */ 596 #define STABS_DEBUG \ 597 .stab 0 : { *(.stab) } \ 598 .stabstr 0 : { *(.stabstr) } \ 599 .stab.excl 0 : { *(.stab.excl) } \ 600 .stab.exclstr 0 : { *(.stab.exclstr) } \ 601 .stab.index 0 : { *(.stab.index) } \ 602 .stab.indexstr 0 : { *(.stab.indexstr) } \ 603 .comment 0 : { *(.comment) } 604 605 #ifdef CONFIG_GENERIC_BUG 606 #define BUG_TABLE \ 607 . = ALIGN(8); \ 608 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 609 VMLINUX_SYMBOL(__start___bug_table) = .; \ 610 *(__bug_table) \ 611 VMLINUX_SYMBOL(__stop___bug_table) = .; \ 612 } 613 #else 614 #define BUG_TABLE 615 #endif 616 617 #ifdef CONFIG_PM_TRACE 618 #define TRACEDATA \ 619 . = ALIGN(4); \ 620 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 621 VMLINUX_SYMBOL(__tracedata_start) = .; \ 622 *(.tracedata) \ 623 VMLINUX_SYMBOL(__tracedata_end) = .; \ 624 } 625 #else 626 #define TRACEDATA 627 #endif 628 629 #define NOTES \ 630 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 631 VMLINUX_SYMBOL(__start_notes) = .; \ 632 *(.note.*) \ 633 VMLINUX_SYMBOL(__stop_notes) = .; \ 634 } 635 636 #define INIT_SETUP(initsetup_align) \ 637 . = ALIGN(initsetup_align); \ 638 VMLINUX_SYMBOL(__setup_start) = .; \ 639 *(.init.setup) \ 640 VMLINUX_SYMBOL(__setup_end) = .; 641 642 #define INIT_CALLS_LEVEL(level) \ 643 VMLINUX_SYMBOL(__initcall##level##_start) = .; \ 644 *(.initcall##level##.init) \ 645 *(.initcall##level##s.init) \ 646 647 #define INIT_CALLS \ 648 VMLINUX_SYMBOL(__initcall_start) = .; \ 649 *(.initcallearly.init) \ 650 INIT_CALLS_LEVEL(0) \ 651 INIT_CALLS_LEVEL(1) \ 652 INIT_CALLS_LEVEL(2) \ 653 INIT_CALLS_LEVEL(3) \ 654 INIT_CALLS_LEVEL(4) \ 655 INIT_CALLS_LEVEL(5) \ 656 INIT_CALLS_LEVEL(rootfs) \ 657 INIT_CALLS_LEVEL(6) \ 658 INIT_CALLS_LEVEL(7) \ 659 VMLINUX_SYMBOL(__initcall_end) = .; 660 661 #define CON_INITCALL \ 662 VMLINUX_SYMBOL(__con_initcall_start) = .; \ 663 *(.con_initcall.init) \ 664 VMLINUX_SYMBOL(__con_initcall_end) = .; 665 666 #define SECURITY_INITCALL \ 667 VMLINUX_SYMBOL(__security_initcall_start) = .; \ 668 *(.security_initcall.init) \ 669 VMLINUX_SYMBOL(__security_initcall_end) = .; 670 671 #ifdef CONFIG_BLK_DEV_INITRD 672 #define INIT_RAM_FS \ 673 . = ALIGN(4); \ 674 VMLINUX_SYMBOL(__initramfs_start) = .; \ 675 *(.init.ramfs) \ 676 . = ALIGN(8); \ 677 *(.init.ramfs.info) 678 #else 679 #define INIT_RAM_FS 680 #endif 681 682 /* 683 * Default discarded sections. 684 * 685 * Some archs want to discard exit text/data at runtime rather than 686 * link time due to cross-section references such as alt instructions, 687 * bug table, eh_frame, etc. DISCARDS must be the last of output 688 * section definitions so that such archs put those in earlier section 689 * definitions. 690 */ 691 #define DISCARDS \ 692 /DISCARD/ : { \ 693 EXIT_TEXT \ 694 EXIT_DATA \ 695 EXIT_CALL \ 696 *(.discard) \ 697 *(.discard.*) \ 698 } 699 700 /** 701 * PERCPU_INPUT - the percpu input sections 702 * @cacheline: cacheline size 703 * 704 * The core percpu section names and core symbols which do not rely 705 * directly upon load addresses. 706 * 707 * @cacheline is used to align subsections to avoid false cacheline 708 * sharing between subsections for different purposes. 709 */ 710 #define PERCPU_INPUT(cacheline) \ 711 VMLINUX_SYMBOL(__per_cpu_start) = .; \ 712 *(.data..percpu..first) \ 713 . = ALIGN(PAGE_SIZE); \ 714 *(.data..percpu..page_aligned) \ 715 . = ALIGN(cacheline); \ 716 *(.data..percpu..read_mostly) \ 717 . = ALIGN(cacheline); \ 718 *(.data..percpu) \ 719 *(.data..percpu..shared_aligned) \ 720 VMLINUX_SYMBOL(__per_cpu_end) = .; 721 722 /** 723 * PERCPU_VADDR - define output section for percpu area 724 * @cacheline: cacheline size 725 * @vaddr: explicit base address (optional) 726 * @phdr: destination PHDR (optional) 727 * 728 * Macro which expands to output section for percpu area. 729 * 730 * @cacheline is used to align subsections to avoid false cacheline 731 * sharing between subsections for different purposes. 732 * 733 * If @vaddr is not blank, it specifies explicit base address and all 734 * percpu symbols will be offset from the given address. If blank, 735 * @vaddr always equals @laddr + LOAD_OFFSET. 736 * 737 * @phdr defines the output PHDR to use if not blank. Be warned that 738 * output PHDR is sticky. If @phdr is specified, the next output 739 * section in the linker script will go there too. @phdr should have 740 * a leading colon. 741 * 742 * Note that this macros defines __per_cpu_load as an absolute symbol. 743 * If there is no need to put the percpu section at a predetermined 744 * address, use PERCPU_SECTION. 745 */ 746 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 747 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 748 .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load) \ 749 - LOAD_OFFSET) { \ 750 PERCPU_INPUT(cacheline) \ 751 } phdr \ 752 . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu); 753 754 /** 755 * PERCPU_SECTION - define output section for percpu area, simple version 756 * @cacheline: cacheline size 757 * 758 * Align to PAGE_SIZE and outputs output section for percpu area. This 759 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 760 * __per_cpu_start will be identical. 761 * 762 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 763 * except that __per_cpu_load is defined as a relative symbol against 764 * .data..percpu which is required for relocatable x86_32 configuration. 765 */ 766 #define PERCPU_SECTION(cacheline) \ 767 . = ALIGN(PAGE_SIZE); \ 768 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 769 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 770 PERCPU_INPUT(cacheline) \ 771 } 772 773 774 /* 775 * Definition of the high level *_SECTION macros 776 * They will fit only a subset of the architectures 777 */ 778 779 780 /* 781 * Writeable data. 782 * All sections are combined in a single .data section. 783 * The sections following CONSTRUCTORS are arranged so their 784 * typical alignment matches. 785 * A cacheline is typical/always less than a PAGE_SIZE so 786 * the sections that has this restriction (or similar) 787 * is located before the ones requiring PAGE_SIZE alignment. 788 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 789 * matches the requirement of PAGE_ALIGNED_DATA. 790 * 791 * use 0 as page_align if page_aligned data is not used */ 792 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \ 793 . = ALIGN(PAGE_SIZE); \ 794 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 795 INIT_TASK_DATA(inittask) \ 796 NOSAVE_DATA \ 797 PAGE_ALIGNED_DATA(pagealigned) \ 798 CACHELINE_ALIGNED_DATA(cacheline) \ 799 READ_MOSTLY_DATA(cacheline) \ 800 DATA_DATA \ 801 CONSTRUCTORS \ 802 } 803 804 #define INIT_TEXT_SECTION(inittext_align) \ 805 . = ALIGN(inittext_align); \ 806 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 807 VMLINUX_SYMBOL(_sinittext) = .; \ 808 INIT_TEXT \ 809 VMLINUX_SYMBOL(_einittext) = .; \ 810 } 811 812 #define INIT_DATA_SECTION(initsetup_align) \ 813 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 814 INIT_DATA \ 815 INIT_SETUP(initsetup_align) \ 816 INIT_CALLS \ 817 CON_INITCALL \ 818 SECURITY_INITCALL \ 819 INIT_RAM_FS \ 820 } 821 822 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 823 . = ALIGN(sbss_align); \ 824 VMLINUX_SYMBOL(__bss_start) = .; \ 825 SBSS(sbss_align) \ 826 BSS(bss_align) \ 827 . = ALIGN(stop_align); \ 828 VMLINUX_SYMBOL(__bss_stop) = .; 829