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 #ifdef CONFIG_ACPI 185 #define ACPI_PROBE_TABLE(name) \ 186 . = ALIGN(8); \ 187 VMLINUX_SYMBOL(__##name##_acpi_probe_table) = .; \ 188 *(__##name##_acpi_probe_table) \ 189 VMLINUX_SYMBOL(__##name##_acpi_probe_table_end) = .; 190 #else 191 #define ACPI_PROBE_TABLE(name) 192 #endif 193 194 #define KERNEL_DTB() \ 195 STRUCT_ALIGN(); \ 196 VMLINUX_SYMBOL(__dtb_start) = .; \ 197 *(.dtb.init.rodata) \ 198 VMLINUX_SYMBOL(__dtb_end) = .; 199 200 /* .data section */ 201 #define DATA_DATA \ 202 *(.data) \ 203 *(.ref.data) \ 204 *(.data..shared_aligned) /* percpu related */ \ 205 MEM_KEEP(init.data) \ 206 MEM_KEEP(exit.data) \ 207 *(.data.unlikely) \ 208 STRUCT_ALIGN(); \ 209 *(__tracepoints) \ 210 /* implement dynamic printk debug */ \ 211 . = ALIGN(8); \ 212 VMLINUX_SYMBOL(__start___jump_table) = .; \ 213 *(__jump_table) \ 214 VMLINUX_SYMBOL(__stop___jump_table) = .; \ 215 . = ALIGN(8); \ 216 VMLINUX_SYMBOL(__start___verbose) = .; \ 217 *(__verbose) \ 218 VMLINUX_SYMBOL(__stop___verbose) = .; \ 219 LIKELY_PROFILE() \ 220 BRANCH_PROFILE() \ 221 TRACE_PRINTKS() \ 222 TRACEPOINT_STR() 223 224 /* 225 * Data section helpers 226 */ 227 #define NOSAVE_DATA \ 228 . = ALIGN(PAGE_SIZE); \ 229 VMLINUX_SYMBOL(__nosave_begin) = .; \ 230 *(.data..nosave) \ 231 . = ALIGN(PAGE_SIZE); \ 232 VMLINUX_SYMBOL(__nosave_end) = .; 233 234 #define PAGE_ALIGNED_DATA(page_align) \ 235 . = ALIGN(page_align); \ 236 *(.data..page_aligned) 237 238 #define READ_MOSTLY_DATA(align) \ 239 . = ALIGN(align); \ 240 *(.data..read_mostly) \ 241 . = ALIGN(align); 242 243 #define CACHELINE_ALIGNED_DATA(align) \ 244 . = ALIGN(align); \ 245 *(.data..cacheline_aligned) 246 247 #define INIT_TASK_DATA(align) \ 248 . = ALIGN(align); \ 249 *(.data..init_task) 250 251 /* 252 * Read only Data 253 */ 254 #define RO_DATA_SECTION(align) \ 255 . = ALIGN((align)); \ 256 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 257 VMLINUX_SYMBOL(__start_rodata) = .; \ 258 *(.rodata) *(.rodata.*) \ 259 *(.data..ro_after_init) /* Read only after init */ \ 260 *(__vermagic) /* Kernel version magic */ \ 261 . = ALIGN(8); \ 262 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .; \ 263 *(__tracepoints_ptrs) /* Tracepoints: pointer array */\ 264 VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .; \ 265 *(__tracepoints_strings)/* Tracepoints: strings */ \ 266 } \ 267 \ 268 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 269 *(.rodata1) \ 270 } \ 271 \ 272 BUG_TABLE \ 273 \ 274 /* PCI quirks */ \ 275 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 276 VMLINUX_SYMBOL(__start_pci_fixups_early) = .; \ 277 *(.pci_fixup_early) \ 278 VMLINUX_SYMBOL(__end_pci_fixups_early) = .; \ 279 VMLINUX_SYMBOL(__start_pci_fixups_header) = .; \ 280 *(.pci_fixup_header) \ 281 VMLINUX_SYMBOL(__end_pci_fixups_header) = .; \ 282 VMLINUX_SYMBOL(__start_pci_fixups_final) = .; \ 283 *(.pci_fixup_final) \ 284 VMLINUX_SYMBOL(__end_pci_fixups_final) = .; \ 285 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .; \ 286 *(.pci_fixup_enable) \ 287 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .; \ 288 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .; \ 289 *(.pci_fixup_resume) \ 290 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .; \ 291 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .; \ 292 *(.pci_fixup_resume_early) \ 293 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .; \ 294 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .; \ 295 *(.pci_fixup_suspend) \ 296 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .; \ 297 VMLINUX_SYMBOL(__start_pci_fixups_suspend_late) = .; \ 298 *(.pci_fixup_suspend_late) \ 299 VMLINUX_SYMBOL(__end_pci_fixups_suspend_late) = .; \ 300 } \ 301 \ 302 /* Built-in firmware blobs */ \ 303 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \ 304 VMLINUX_SYMBOL(__start_builtin_fw) = .; \ 305 *(.builtin_fw) \ 306 VMLINUX_SYMBOL(__end_builtin_fw) = .; \ 307 } \ 308 \ 309 TRACEDATA \ 310 \ 311 /* Kernel symbol table: Normal symbols */ \ 312 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 313 VMLINUX_SYMBOL(__start___ksymtab) = .; \ 314 *(SORT(___ksymtab+*)) \ 315 VMLINUX_SYMBOL(__stop___ksymtab) = .; \ 316 } \ 317 \ 318 /* Kernel symbol table: GPL-only symbols */ \ 319 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 320 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .; \ 321 *(SORT(___ksymtab_gpl+*)) \ 322 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .; \ 323 } \ 324 \ 325 /* Kernel symbol table: Normal unused symbols */ \ 326 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \ 327 VMLINUX_SYMBOL(__start___ksymtab_unused) = .; \ 328 *(SORT(___ksymtab_unused+*)) \ 329 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .; \ 330 } \ 331 \ 332 /* Kernel symbol table: GPL-only unused symbols */ \ 333 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \ 334 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .; \ 335 *(SORT(___ksymtab_unused_gpl+*)) \ 336 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .; \ 337 } \ 338 \ 339 /* Kernel symbol table: GPL-future-only symbols */ \ 340 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \ 341 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .; \ 342 *(SORT(___ksymtab_gpl_future+*)) \ 343 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .; \ 344 } \ 345 \ 346 /* Kernel symbol table: Normal symbols */ \ 347 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 348 VMLINUX_SYMBOL(__start___kcrctab) = .; \ 349 *(SORT(___kcrctab+*)) \ 350 VMLINUX_SYMBOL(__stop___kcrctab) = .; \ 351 } \ 352 \ 353 /* Kernel symbol table: GPL-only symbols */ \ 354 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 355 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .; \ 356 *(SORT(___kcrctab_gpl+*)) \ 357 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .; \ 358 } \ 359 \ 360 /* Kernel symbol table: Normal unused symbols */ \ 361 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \ 362 VMLINUX_SYMBOL(__start___kcrctab_unused) = .; \ 363 *(SORT(___kcrctab_unused+*)) \ 364 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .; \ 365 } \ 366 \ 367 /* Kernel symbol table: GPL-only unused symbols */ \ 368 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \ 369 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .; \ 370 *(SORT(___kcrctab_unused_gpl+*)) \ 371 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .; \ 372 } \ 373 \ 374 /* Kernel symbol table: GPL-future-only symbols */ \ 375 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \ 376 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .; \ 377 *(SORT(___kcrctab_gpl_future+*)) \ 378 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .; \ 379 } \ 380 \ 381 /* Kernel symbol table: strings */ \ 382 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 383 *(__ksymtab_strings) \ 384 } \ 385 \ 386 /* __*init sections */ \ 387 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 388 *(.ref.rodata) \ 389 MEM_KEEP(init.rodata) \ 390 MEM_KEEP(exit.rodata) \ 391 } \ 392 \ 393 /* Built-in module parameters. */ \ 394 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 395 VMLINUX_SYMBOL(__start___param) = .; \ 396 *(__param) \ 397 VMLINUX_SYMBOL(__stop___param) = .; \ 398 } \ 399 \ 400 /* Built-in module versions. */ \ 401 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 402 VMLINUX_SYMBOL(__start___modver) = .; \ 403 *(__modver) \ 404 VMLINUX_SYMBOL(__stop___modver) = .; \ 405 . = ALIGN((align)); \ 406 VMLINUX_SYMBOL(__end_rodata) = .; \ 407 } \ 408 . = ALIGN((align)); 409 410 /* RODATA & RO_DATA provided for backward compatibility. 411 * All archs are supposed to use RO_DATA() */ 412 #define RODATA RO_DATA_SECTION(4096) 413 #define RO_DATA(align) RO_DATA_SECTION(align) 414 415 #define SECURITY_INIT \ 416 .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \ 417 VMLINUX_SYMBOL(__security_initcall_start) = .; \ 418 *(.security_initcall.init) \ 419 VMLINUX_SYMBOL(__security_initcall_end) = .; \ 420 } 421 422 /* .text section. Map to function alignment to avoid address changes 423 * during second ld run in second ld pass when generating System.map */ 424 #define TEXT_TEXT \ 425 ALIGN_FUNCTION(); \ 426 *(.text.hot .text .text.fixup .text.unlikely) \ 427 *(.ref.text) \ 428 MEM_KEEP(init.text) \ 429 MEM_KEEP(exit.text) \ 430 431 432 /* sched.text is aling to function alignment to secure we have same 433 * address even at second ld pass when generating System.map */ 434 #define SCHED_TEXT \ 435 ALIGN_FUNCTION(); \ 436 VMLINUX_SYMBOL(__sched_text_start) = .; \ 437 *(.sched.text) \ 438 VMLINUX_SYMBOL(__sched_text_end) = .; 439 440 /* spinlock.text is aling to function alignment to secure we have same 441 * address even at second ld pass when generating System.map */ 442 #define LOCK_TEXT \ 443 ALIGN_FUNCTION(); \ 444 VMLINUX_SYMBOL(__lock_text_start) = .; \ 445 *(.spinlock.text) \ 446 VMLINUX_SYMBOL(__lock_text_end) = .; 447 448 #define KPROBES_TEXT \ 449 ALIGN_FUNCTION(); \ 450 VMLINUX_SYMBOL(__kprobes_text_start) = .; \ 451 *(.kprobes.text) \ 452 VMLINUX_SYMBOL(__kprobes_text_end) = .; 453 454 #define ENTRY_TEXT \ 455 ALIGN_FUNCTION(); \ 456 VMLINUX_SYMBOL(__entry_text_start) = .; \ 457 *(.entry.text) \ 458 VMLINUX_SYMBOL(__entry_text_end) = .; 459 460 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 461 #define IRQENTRY_TEXT \ 462 ALIGN_FUNCTION(); \ 463 VMLINUX_SYMBOL(__irqentry_text_start) = .; \ 464 *(.irqentry.text) \ 465 VMLINUX_SYMBOL(__irqentry_text_end) = .; 466 #else 467 #define IRQENTRY_TEXT 468 #endif 469 470 /* Section used for early init (in .S files) */ 471 #define HEAD_TEXT *(.head.text) 472 473 #define HEAD_TEXT_SECTION \ 474 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 475 HEAD_TEXT \ 476 } 477 478 /* 479 * Exception table 480 */ 481 #define EXCEPTION_TABLE(align) \ 482 . = ALIGN(align); \ 483 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 484 VMLINUX_SYMBOL(__start___ex_table) = .; \ 485 *(__ex_table) \ 486 VMLINUX_SYMBOL(__stop___ex_table) = .; \ 487 } 488 489 /* 490 * Init task 491 */ 492 #define INIT_TASK_DATA_SECTION(align) \ 493 . = ALIGN(align); \ 494 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 495 INIT_TASK_DATA(align) \ 496 } 497 498 #ifdef CONFIG_CONSTRUCTORS 499 #define KERNEL_CTORS() . = ALIGN(8); \ 500 VMLINUX_SYMBOL(__ctors_start) = .; \ 501 *(.ctors) \ 502 *(SORT(.init_array.*)) \ 503 *(.init_array) \ 504 VMLINUX_SYMBOL(__ctors_end) = .; 505 #else 506 #define KERNEL_CTORS() 507 #endif 508 509 /* init and exit section handling */ 510 #define INIT_DATA \ 511 *(.init.data) \ 512 MEM_DISCARD(init.data) \ 513 KERNEL_CTORS() \ 514 MCOUNT_REC() \ 515 *(.init.rodata) \ 516 FTRACE_EVENTS() \ 517 TRACE_SYSCALLS() \ 518 KPROBE_BLACKLIST() \ 519 MEM_DISCARD(init.rodata) \ 520 CLK_OF_TABLES() \ 521 RESERVEDMEM_OF_TABLES() \ 522 CLKSRC_OF_TABLES() \ 523 IOMMU_OF_TABLES() \ 524 CPU_METHOD_OF_TABLES() \ 525 CPUIDLE_METHOD_OF_TABLES() \ 526 KERNEL_DTB() \ 527 IRQCHIP_OF_MATCH_TABLE() \ 528 ACPI_PROBE_TABLE(irqchip) \ 529 ACPI_PROBE_TABLE(clksrc) \ 530 EARLYCON_TABLE() \ 531 EARLYCON_OF_TABLES() 532 533 #define INIT_TEXT \ 534 *(.init.text) \ 535 MEM_DISCARD(init.text) 536 537 #define EXIT_DATA \ 538 *(.exit.data) \ 539 MEM_DISCARD(exit.data) \ 540 MEM_DISCARD(exit.rodata) 541 542 #define EXIT_TEXT \ 543 *(.exit.text) \ 544 MEM_DISCARD(exit.text) 545 546 #define EXIT_CALL \ 547 *(.exitcall.exit) 548 549 /* 550 * bss (Block Started by Symbol) - uninitialized data 551 * zeroed during startup 552 */ 553 #define SBSS(sbss_align) \ 554 . = ALIGN(sbss_align); \ 555 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 556 *(.sbss) \ 557 *(.scommon) \ 558 } 559 560 /* 561 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 562 * sections to the front of bss. 563 */ 564 #ifndef BSS_FIRST_SECTIONS 565 #define BSS_FIRST_SECTIONS 566 #endif 567 568 #define BSS(bss_align) \ 569 . = ALIGN(bss_align); \ 570 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 571 BSS_FIRST_SECTIONS \ 572 *(.bss..page_aligned) \ 573 *(.dynbss) \ 574 *(.bss) \ 575 *(COMMON) \ 576 } 577 578 /* 579 * DWARF debug sections. 580 * Symbols in the DWARF debugging sections are relative to 581 * the beginning of the section so we begin them at 0. 582 */ 583 #define DWARF_DEBUG \ 584 /* DWARF 1 */ \ 585 .debug 0 : { *(.debug) } \ 586 .line 0 : { *(.line) } \ 587 /* GNU DWARF 1 extensions */ \ 588 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 589 .debug_sfnames 0 : { *(.debug_sfnames) } \ 590 /* DWARF 1.1 and DWARF 2 */ \ 591 .debug_aranges 0 : { *(.debug_aranges) } \ 592 .debug_pubnames 0 : { *(.debug_pubnames) } \ 593 /* DWARF 2 */ \ 594 .debug_info 0 : { *(.debug_info \ 595 .gnu.linkonce.wi.*) } \ 596 .debug_abbrev 0 : { *(.debug_abbrev) } \ 597 .debug_line 0 : { *(.debug_line) } \ 598 .debug_frame 0 : { *(.debug_frame) } \ 599 .debug_str 0 : { *(.debug_str) } \ 600 .debug_loc 0 : { *(.debug_loc) } \ 601 .debug_macinfo 0 : { *(.debug_macinfo) } \ 602 /* SGI/MIPS DWARF 2 extensions */ \ 603 .debug_weaknames 0 : { *(.debug_weaknames) } \ 604 .debug_funcnames 0 : { *(.debug_funcnames) } \ 605 .debug_typenames 0 : { *(.debug_typenames) } \ 606 .debug_varnames 0 : { *(.debug_varnames) } \ 607 608 /* Stabs debugging sections. */ 609 #define STABS_DEBUG \ 610 .stab 0 : { *(.stab) } \ 611 .stabstr 0 : { *(.stabstr) } \ 612 .stab.excl 0 : { *(.stab.excl) } \ 613 .stab.exclstr 0 : { *(.stab.exclstr) } \ 614 .stab.index 0 : { *(.stab.index) } \ 615 .stab.indexstr 0 : { *(.stab.indexstr) } \ 616 .comment 0 : { *(.comment) } 617 618 #ifdef CONFIG_GENERIC_BUG 619 #define BUG_TABLE \ 620 . = ALIGN(8); \ 621 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 622 VMLINUX_SYMBOL(__start___bug_table) = .; \ 623 *(__bug_table) \ 624 VMLINUX_SYMBOL(__stop___bug_table) = .; \ 625 } 626 #else 627 #define BUG_TABLE 628 #endif 629 630 #ifdef CONFIG_PM_TRACE 631 #define TRACEDATA \ 632 . = ALIGN(4); \ 633 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 634 VMLINUX_SYMBOL(__tracedata_start) = .; \ 635 *(.tracedata) \ 636 VMLINUX_SYMBOL(__tracedata_end) = .; \ 637 } 638 #else 639 #define TRACEDATA 640 #endif 641 642 #define NOTES \ 643 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 644 VMLINUX_SYMBOL(__start_notes) = .; \ 645 *(.note.*) \ 646 VMLINUX_SYMBOL(__stop_notes) = .; \ 647 } 648 649 #define INIT_SETUP(initsetup_align) \ 650 . = ALIGN(initsetup_align); \ 651 VMLINUX_SYMBOL(__setup_start) = .; \ 652 *(.init.setup) \ 653 VMLINUX_SYMBOL(__setup_end) = .; 654 655 #define INIT_CALLS_LEVEL(level) \ 656 VMLINUX_SYMBOL(__initcall##level##_start) = .; \ 657 *(.initcall##level##.init) \ 658 *(.initcall##level##s.init) \ 659 660 #define INIT_CALLS \ 661 VMLINUX_SYMBOL(__initcall_start) = .; \ 662 *(.initcallearly.init) \ 663 INIT_CALLS_LEVEL(0) \ 664 INIT_CALLS_LEVEL(1) \ 665 INIT_CALLS_LEVEL(2) \ 666 INIT_CALLS_LEVEL(3) \ 667 INIT_CALLS_LEVEL(4) \ 668 INIT_CALLS_LEVEL(5) \ 669 INIT_CALLS_LEVEL(rootfs) \ 670 INIT_CALLS_LEVEL(6) \ 671 INIT_CALLS_LEVEL(7) \ 672 VMLINUX_SYMBOL(__initcall_end) = .; 673 674 #define CON_INITCALL \ 675 VMLINUX_SYMBOL(__con_initcall_start) = .; \ 676 *(.con_initcall.init) \ 677 VMLINUX_SYMBOL(__con_initcall_end) = .; 678 679 #define SECURITY_INITCALL \ 680 VMLINUX_SYMBOL(__security_initcall_start) = .; \ 681 *(.security_initcall.init) \ 682 VMLINUX_SYMBOL(__security_initcall_end) = .; 683 684 #ifdef CONFIG_BLK_DEV_INITRD 685 #define INIT_RAM_FS \ 686 . = ALIGN(4); \ 687 VMLINUX_SYMBOL(__initramfs_start) = .; \ 688 *(.init.ramfs) \ 689 . = ALIGN(8); \ 690 *(.init.ramfs.info) 691 #else 692 #define INIT_RAM_FS 693 #endif 694 695 /* 696 * Default discarded sections. 697 * 698 * Some archs want to discard exit text/data at runtime rather than 699 * link time due to cross-section references such as alt instructions, 700 * bug table, eh_frame, etc. DISCARDS must be the last of output 701 * section definitions so that such archs put those in earlier section 702 * definitions. 703 */ 704 #define DISCARDS \ 705 /DISCARD/ : { \ 706 EXIT_TEXT \ 707 EXIT_DATA \ 708 EXIT_CALL \ 709 *(.discard) \ 710 *(.discard.*) \ 711 } 712 713 /** 714 * PERCPU_INPUT - the percpu input sections 715 * @cacheline: cacheline size 716 * 717 * The core percpu section names and core symbols which do not rely 718 * directly upon load addresses. 719 * 720 * @cacheline is used to align subsections to avoid false cacheline 721 * sharing between subsections for different purposes. 722 */ 723 #define PERCPU_INPUT(cacheline) \ 724 VMLINUX_SYMBOL(__per_cpu_start) = .; \ 725 *(.data..percpu..first) \ 726 . = ALIGN(PAGE_SIZE); \ 727 *(.data..percpu..page_aligned) \ 728 . = ALIGN(cacheline); \ 729 *(.data..percpu..read_mostly) \ 730 . = ALIGN(cacheline); \ 731 *(.data..percpu) \ 732 *(.data..percpu..shared_aligned) \ 733 VMLINUX_SYMBOL(__per_cpu_end) = .; 734 735 /** 736 * PERCPU_VADDR - define output section for percpu area 737 * @cacheline: cacheline size 738 * @vaddr: explicit base address (optional) 739 * @phdr: destination PHDR (optional) 740 * 741 * Macro which expands to output section for percpu area. 742 * 743 * @cacheline is used to align subsections to avoid false cacheline 744 * sharing between subsections for different purposes. 745 * 746 * If @vaddr is not blank, it specifies explicit base address and all 747 * percpu symbols will be offset from the given address. If blank, 748 * @vaddr always equals @laddr + LOAD_OFFSET. 749 * 750 * @phdr defines the output PHDR to use if not blank. Be warned that 751 * output PHDR is sticky. If @phdr is specified, the next output 752 * section in the linker script will go there too. @phdr should have 753 * a leading colon. 754 * 755 * Note that this macros defines __per_cpu_load as an absolute symbol. 756 * If there is no need to put the percpu section at a predetermined 757 * address, use PERCPU_SECTION. 758 */ 759 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 760 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 761 .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load) \ 762 - LOAD_OFFSET) { \ 763 PERCPU_INPUT(cacheline) \ 764 } phdr \ 765 . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu); 766 767 /** 768 * PERCPU_SECTION - define output section for percpu area, simple version 769 * @cacheline: cacheline size 770 * 771 * Align to PAGE_SIZE and outputs output section for percpu area. This 772 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 773 * __per_cpu_start will be identical. 774 * 775 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 776 * except that __per_cpu_load is defined as a relative symbol against 777 * .data..percpu which is required for relocatable x86_32 configuration. 778 */ 779 #define PERCPU_SECTION(cacheline) \ 780 . = ALIGN(PAGE_SIZE); \ 781 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 782 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 783 PERCPU_INPUT(cacheline) \ 784 } 785 786 787 /* 788 * Definition of the high level *_SECTION macros 789 * They will fit only a subset of the architectures 790 */ 791 792 793 /* 794 * Writeable data. 795 * All sections are combined in a single .data section. 796 * The sections following CONSTRUCTORS are arranged so their 797 * typical alignment matches. 798 * A cacheline is typical/always less than a PAGE_SIZE so 799 * the sections that has this restriction (or similar) 800 * is located before the ones requiring PAGE_SIZE alignment. 801 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 802 * matches the requirement of PAGE_ALIGNED_DATA. 803 * 804 * use 0 as page_align if page_aligned data is not used */ 805 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \ 806 . = ALIGN(PAGE_SIZE); \ 807 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 808 INIT_TASK_DATA(inittask) \ 809 NOSAVE_DATA \ 810 PAGE_ALIGNED_DATA(pagealigned) \ 811 CACHELINE_ALIGNED_DATA(cacheline) \ 812 READ_MOSTLY_DATA(cacheline) \ 813 DATA_DATA \ 814 CONSTRUCTORS \ 815 } 816 817 #define INIT_TEXT_SECTION(inittext_align) \ 818 . = ALIGN(inittext_align); \ 819 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 820 VMLINUX_SYMBOL(_sinittext) = .; \ 821 INIT_TEXT \ 822 VMLINUX_SYMBOL(_einittext) = .; \ 823 } 824 825 #define INIT_DATA_SECTION(initsetup_align) \ 826 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 827 INIT_DATA \ 828 INIT_SETUP(initsetup_align) \ 829 INIT_CALLS \ 830 CON_INITCALL \ 831 SECURITY_INITCALL \ 832 INIT_RAM_FS \ 833 } 834 835 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 836 . = ALIGN(sbss_align); \ 837 VMLINUX_SYMBOL(__bss_start) = .; \ 838 SBSS(sbss_align) \ 839 BSS(bss_align) \ 840 . = ALIGN(stop_align); \ 841 VMLINUX_SYMBOL(__bss_stop) = .; 842