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 VMLINUX_SYMBOL(__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) 182 183 #ifdef CONFIG_ACPI 184 #define ACPI_PROBE_TABLE(name) \ 185 . = ALIGN(8); \ 186 VMLINUX_SYMBOL(__##name##_acpi_probe_table) = .; \ 187 *(__##name##_acpi_probe_table) \ 188 VMLINUX_SYMBOL(__##name##_acpi_probe_table_end) = .; 189 #else 190 #define ACPI_PROBE_TABLE(name) 191 #endif 192 193 #define KERNEL_DTB() \ 194 STRUCT_ALIGN(); \ 195 VMLINUX_SYMBOL(__dtb_start) = .; \ 196 *(.dtb.init.rodata) \ 197 VMLINUX_SYMBOL(__dtb_end) = .; 198 199 /* .data section */ 200 #define DATA_DATA \ 201 *(.data) \ 202 *(.ref.data) \ 203 *(.data..shared_aligned) /* percpu related */ \ 204 MEM_KEEP(init.data) \ 205 MEM_KEEP(exit.data) \ 206 *(.data.unlikely) \ 207 STRUCT_ALIGN(); \ 208 *(__tracepoints) \ 209 /* implement dynamic printk debug */ \ 210 . = ALIGN(8); \ 211 VMLINUX_SYMBOL(__start___jump_table) = .; \ 212 *(__jump_table) \ 213 VMLINUX_SYMBOL(__stop___jump_table) = .; \ 214 . = ALIGN(8); \ 215 VMLINUX_SYMBOL(__start___verbose) = .; \ 216 *(__verbose) \ 217 VMLINUX_SYMBOL(__stop___verbose) = .; \ 218 LIKELY_PROFILE() \ 219 BRANCH_PROFILE() \ 220 TRACE_PRINTKS() \ 221 TRACEPOINT_STR() 222 223 /* 224 * Data section helpers 225 */ 226 #define NOSAVE_DATA \ 227 . = ALIGN(PAGE_SIZE); \ 228 VMLINUX_SYMBOL(__nosave_begin) = .; \ 229 *(.data..nosave) \ 230 . = ALIGN(PAGE_SIZE); \ 231 VMLINUX_SYMBOL(__nosave_end) = .; 232 233 #define PAGE_ALIGNED_DATA(page_align) \ 234 . = ALIGN(page_align); \ 235 *(.data..page_aligned) 236 237 #define READ_MOSTLY_DATA(align) \ 238 . = ALIGN(align); \ 239 *(.data..read_mostly) \ 240 . = ALIGN(align); 241 242 #define CACHELINE_ALIGNED_DATA(align) \ 243 . = ALIGN(align); \ 244 *(.data..cacheline_aligned) 245 246 #define INIT_TASK_DATA(align) \ 247 . = ALIGN(align); \ 248 *(.data..init_task) 249 250 /* 251 * Read only Data 252 */ 253 #define RO_DATA_SECTION(align) \ 254 . = ALIGN((align)); \ 255 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 256 VMLINUX_SYMBOL(__start_rodata) = .; \ 257 *(.rodata) *(.rodata.*) \ 258 *(.data..ro_after_init) /* Read only after init */ \ 259 *(__vermagic) /* Kernel version magic */ \ 260 . = ALIGN(8); \ 261 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .; \ 262 *(__tracepoints_ptrs) /* Tracepoints: pointer array */\ 263 VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .; \ 264 *(__tracepoints_strings)/* Tracepoints: strings */ \ 265 } \ 266 \ 267 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 268 *(.rodata1) \ 269 } \ 270 \ 271 BUG_TABLE \ 272 \ 273 /* PCI quirks */ \ 274 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 275 VMLINUX_SYMBOL(__start_pci_fixups_early) = .; \ 276 *(.pci_fixup_early) \ 277 VMLINUX_SYMBOL(__end_pci_fixups_early) = .; \ 278 VMLINUX_SYMBOL(__start_pci_fixups_header) = .; \ 279 *(.pci_fixup_header) \ 280 VMLINUX_SYMBOL(__end_pci_fixups_header) = .; \ 281 VMLINUX_SYMBOL(__start_pci_fixups_final) = .; \ 282 *(.pci_fixup_final) \ 283 VMLINUX_SYMBOL(__end_pci_fixups_final) = .; \ 284 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .; \ 285 *(.pci_fixup_enable) \ 286 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .; \ 287 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .; \ 288 *(.pci_fixup_resume) \ 289 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .; \ 290 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .; \ 291 *(.pci_fixup_resume_early) \ 292 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .; \ 293 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .; \ 294 *(.pci_fixup_suspend) \ 295 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .; \ 296 VMLINUX_SYMBOL(__start_pci_fixups_suspend_late) = .; \ 297 *(.pci_fixup_suspend_late) \ 298 VMLINUX_SYMBOL(__end_pci_fixups_suspend_late) = .; \ 299 } \ 300 \ 301 /* Built-in firmware blobs */ \ 302 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \ 303 VMLINUX_SYMBOL(__start_builtin_fw) = .; \ 304 *(.builtin_fw) \ 305 VMLINUX_SYMBOL(__end_builtin_fw) = .; \ 306 } \ 307 \ 308 TRACEDATA \ 309 \ 310 /* Kernel symbol table: Normal symbols */ \ 311 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 312 VMLINUX_SYMBOL(__start___ksymtab) = .; \ 313 *(SORT(___ksymtab+*)) \ 314 VMLINUX_SYMBOL(__stop___ksymtab) = .; \ 315 } \ 316 \ 317 /* Kernel symbol table: GPL-only symbols */ \ 318 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 319 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .; \ 320 *(SORT(___ksymtab_gpl+*)) \ 321 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .; \ 322 } \ 323 \ 324 /* Kernel symbol table: Normal unused symbols */ \ 325 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \ 326 VMLINUX_SYMBOL(__start___ksymtab_unused) = .; \ 327 *(SORT(___ksymtab_unused+*)) \ 328 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .; \ 329 } \ 330 \ 331 /* Kernel symbol table: GPL-only unused symbols */ \ 332 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \ 333 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .; \ 334 *(SORT(___ksymtab_unused_gpl+*)) \ 335 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .; \ 336 } \ 337 \ 338 /* Kernel symbol table: GPL-future-only symbols */ \ 339 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \ 340 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .; \ 341 *(SORT(___ksymtab_gpl_future+*)) \ 342 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .; \ 343 } \ 344 \ 345 /* Kernel symbol table: Normal symbols */ \ 346 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 347 VMLINUX_SYMBOL(__start___kcrctab) = .; \ 348 *(SORT(___kcrctab+*)) \ 349 VMLINUX_SYMBOL(__stop___kcrctab) = .; \ 350 } \ 351 \ 352 /* Kernel symbol table: GPL-only symbols */ \ 353 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 354 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .; \ 355 *(SORT(___kcrctab_gpl+*)) \ 356 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .; \ 357 } \ 358 \ 359 /* Kernel symbol table: Normal unused symbols */ \ 360 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \ 361 VMLINUX_SYMBOL(__start___kcrctab_unused) = .; \ 362 *(SORT(___kcrctab_unused+*)) \ 363 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .; \ 364 } \ 365 \ 366 /* Kernel symbol table: GPL-only unused symbols */ \ 367 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \ 368 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .; \ 369 *(SORT(___kcrctab_unused_gpl+*)) \ 370 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .; \ 371 } \ 372 \ 373 /* Kernel symbol table: GPL-future-only symbols */ \ 374 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \ 375 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .; \ 376 *(SORT(___kcrctab_gpl_future+*)) \ 377 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .; \ 378 } \ 379 \ 380 /* Kernel symbol table: strings */ \ 381 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 382 *(__ksymtab_strings) \ 383 } \ 384 \ 385 /* __*init sections */ \ 386 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 387 *(.ref.rodata) \ 388 MEM_KEEP(init.rodata) \ 389 MEM_KEEP(exit.rodata) \ 390 } \ 391 \ 392 /* Built-in module parameters. */ \ 393 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 394 VMLINUX_SYMBOL(__start___param) = .; \ 395 *(__param) \ 396 VMLINUX_SYMBOL(__stop___param) = .; \ 397 } \ 398 \ 399 /* Built-in module versions. */ \ 400 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 401 VMLINUX_SYMBOL(__start___modver) = .; \ 402 *(__modver) \ 403 VMLINUX_SYMBOL(__stop___modver) = .; \ 404 . = ALIGN((align)); \ 405 VMLINUX_SYMBOL(__end_rodata) = .; \ 406 } \ 407 . = ALIGN((align)); 408 409 /* RODATA & RO_DATA provided for backward compatibility. 410 * All archs are supposed to use RO_DATA() */ 411 #define RODATA RO_DATA_SECTION(4096) 412 #define RO_DATA(align) RO_DATA_SECTION(align) 413 414 #define SECURITY_INIT \ 415 .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \ 416 VMLINUX_SYMBOL(__security_initcall_start) = .; \ 417 *(.security_initcall.init) \ 418 VMLINUX_SYMBOL(__security_initcall_end) = .; \ 419 } 420 421 /* .text section. Map to function alignment to avoid address changes 422 * during second ld run in second ld pass when generating System.map */ 423 #define TEXT_TEXT \ 424 ALIGN_FUNCTION(); \ 425 *(.text.hot .text .text.fixup .text.unlikely) \ 426 *(.ref.text) \ 427 MEM_KEEP(init.text) \ 428 MEM_KEEP(exit.text) \ 429 430 431 /* sched.text is aling to function alignment to secure we have same 432 * address even at second ld pass when generating System.map */ 433 #define SCHED_TEXT \ 434 ALIGN_FUNCTION(); \ 435 VMLINUX_SYMBOL(__sched_text_start) = .; \ 436 *(.sched.text) \ 437 VMLINUX_SYMBOL(__sched_text_end) = .; 438 439 /* spinlock.text is aling to function alignment to secure we have same 440 * address even at second ld pass when generating System.map */ 441 #define LOCK_TEXT \ 442 ALIGN_FUNCTION(); \ 443 VMLINUX_SYMBOL(__lock_text_start) = .; \ 444 *(.spinlock.text) \ 445 VMLINUX_SYMBOL(__lock_text_end) = .; 446 447 #define KPROBES_TEXT \ 448 ALIGN_FUNCTION(); \ 449 VMLINUX_SYMBOL(__kprobes_text_start) = .; \ 450 *(.kprobes.text) \ 451 VMLINUX_SYMBOL(__kprobes_text_end) = .; 452 453 #define ENTRY_TEXT \ 454 ALIGN_FUNCTION(); \ 455 VMLINUX_SYMBOL(__entry_text_start) = .; \ 456 *(.entry.text) \ 457 VMLINUX_SYMBOL(__entry_text_end) = .; 458 459 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 460 #define IRQENTRY_TEXT \ 461 ALIGN_FUNCTION(); \ 462 VMLINUX_SYMBOL(__irqentry_text_start) = .; \ 463 *(.irqentry.text) \ 464 VMLINUX_SYMBOL(__irqentry_text_end) = .; 465 #else 466 #define IRQENTRY_TEXT 467 #endif 468 469 /* Section used for early init (in .S files) */ 470 #define HEAD_TEXT *(.head.text) 471 472 #define HEAD_TEXT_SECTION \ 473 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 474 HEAD_TEXT \ 475 } 476 477 /* 478 * Exception table 479 */ 480 #define EXCEPTION_TABLE(align) \ 481 . = ALIGN(align); \ 482 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 483 VMLINUX_SYMBOL(__start___ex_table) = .; \ 484 *(__ex_table) \ 485 VMLINUX_SYMBOL(__stop___ex_table) = .; \ 486 } 487 488 /* 489 * Init task 490 */ 491 #define INIT_TASK_DATA_SECTION(align) \ 492 . = ALIGN(align); \ 493 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 494 INIT_TASK_DATA(align) \ 495 } 496 497 #ifdef CONFIG_CONSTRUCTORS 498 #define KERNEL_CTORS() . = ALIGN(8); \ 499 VMLINUX_SYMBOL(__ctors_start) = .; \ 500 *(.ctors) \ 501 *(SORT(.init_array.*)) \ 502 *(.init_array) \ 503 VMLINUX_SYMBOL(__ctors_end) = .; 504 #else 505 #define KERNEL_CTORS() 506 #endif 507 508 /* init and exit section handling */ 509 #define INIT_DATA \ 510 *(.init.data) \ 511 MEM_DISCARD(init.data) \ 512 KERNEL_CTORS() \ 513 MCOUNT_REC() \ 514 *(.init.rodata) \ 515 FTRACE_EVENTS() \ 516 TRACE_SYSCALLS() \ 517 KPROBE_BLACKLIST() \ 518 MEM_DISCARD(init.rodata) \ 519 CLK_OF_TABLES() \ 520 RESERVEDMEM_OF_TABLES() \ 521 CLKSRC_OF_TABLES() \ 522 IOMMU_OF_TABLES() \ 523 CPU_METHOD_OF_TABLES() \ 524 CPUIDLE_METHOD_OF_TABLES() \ 525 KERNEL_DTB() \ 526 IRQCHIP_OF_MATCH_TABLE() \ 527 ACPI_PROBE_TABLE(irqchip) \ 528 ACPI_PROBE_TABLE(clksrc) \ 529 EARLYCON_TABLE() 530 531 #define INIT_TEXT \ 532 *(.init.text) \ 533 MEM_DISCARD(init.text) 534 535 #define EXIT_DATA \ 536 *(.exit.data) \ 537 MEM_DISCARD(exit.data) \ 538 MEM_DISCARD(exit.rodata) 539 540 #define EXIT_TEXT \ 541 *(.exit.text) \ 542 MEM_DISCARD(exit.text) 543 544 #define EXIT_CALL \ 545 *(.exitcall.exit) 546 547 /* 548 * bss (Block Started by Symbol) - uninitialized data 549 * zeroed during startup 550 */ 551 #define SBSS(sbss_align) \ 552 . = ALIGN(sbss_align); \ 553 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 554 *(.sbss) \ 555 *(.scommon) \ 556 } 557 558 /* 559 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 560 * sections to the front of bss. 561 */ 562 #ifndef BSS_FIRST_SECTIONS 563 #define BSS_FIRST_SECTIONS 564 #endif 565 566 #define BSS(bss_align) \ 567 . = ALIGN(bss_align); \ 568 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 569 BSS_FIRST_SECTIONS \ 570 *(.bss..page_aligned) \ 571 *(.dynbss) \ 572 *(.bss) \ 573 *(COMMON) \ 574 } 575 576 /* 577 * DWARF debug sections. 578 * Symbols in the DWARF debugging sections are relative to 579 * the beginning of the section so we begin them at 0. 580 */ 581 #define DWARF_DEBUG \ 582 /* DWARF 1 */ \ 583 .debug 0 : { *(.debug) } \ 584 .line 0 : { *(.line) } \ 585 /* GNU DWARF 1 extensions */ \ 586 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 587 .debug_sfnames 0 : { *(.debug_sfnames) } \ 588 /* DWARF 1.1 and DWARF 2 */ \ 589 .debug_aranges 0 : { *(.debug_aranges) } \ 590 .debug_pubnames 0 : { *(.debug_pubnames) } \ 591 /* DWARF 2 */ \ 592 .debug_info 0 : { *(.debug_info \ 593 .gnu.linkonce.wi.*) } \ 594 .debug_abbrev 0 : { *(.debug_abbrev) } \ 595 .debug_line 0 : { *(.debug_line) } \ 596 .debug_frame 0 : { *(.debug_frame) } \ 597 .debug_str 0 : { *(.debug_str) } \ 598 .debug_loc 0 : { *(.debug_loc) } \ 599 .debug_macinfo 0 : { *(.debug_macinfo) } \ 600 /* SGI/MIPS DWARF 2 extensions */ \ 601 .debug_weaknames 0 : { *(.debug_weaknames) } \ 602 .debug_funcnames 0 : { *(.debug_funcnames) } \ 603 .debug_typenames 0 : { *(.debug_typenames) } \ 604 .debug_varnames 0 : { *(.debug_varnames) } \ 605 606 /* Stabs debugging sections. */ 607 #define STABS_DEBUG \ 608 .stab 0 : { *(.stab) } \ 609 .stabstr 0 : { *(.stabstr) } \ 610 .stab.excl 0 : { *(.stab.excl) } \ 611 .stab.exclstr 0 : { *(.stab.exclstr) } \ 612 .stab.index 0 : { *(.stab.index) } \ 613 .stab.indexstr 0 : { *(.stab.indexstr) } \ 614 .comment 0 : { *(.comment) } 615 616 #ifdef CONFIG_GENERIC_BUG 617 #define BUG_TABLE \ 618 . = ALIGN(8); \ 619 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 620 VMLINUX_SYMBOL(__start___bug_table) = .; \ 621 *(__bug_table) \ 622 VMLINUX_SYMBOL(__stop___bug_table) = .; \ 623 } 624 #else 625 #define BUG_TABLE 626 #endif 627 628 #ifdef CONFIG_PM_TRACE 629 #define TRACEDATA \ 630 . = ALIGN(4); \ 631 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 632 VMLINUX_SYMBOL(__tracedata_start) = .; \ 633 *(.tracedata) \ 634 VMLINUX_SYMBOL(__tracedata_end) = .; \ 635 } 636 #else 637 #define TRACEDATA 638 #endif 639 640 #define NOTES \ 641 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 642 VMLINUX_SYMBOL(__start_notes) = .; \ 643 *(.note.*) \ 644 VMLINUX_SYMBOL(__stop_notes) = .; \ 645 } 646 647 #define INIT_SETUP(initsetup_align) \ 648 . = ALIGN(initsetup_align); \ 649 VMLINUX_SYMBOL(__setup_start) = .; \ 650 *(.init.setup) \ 651 VMLINUX_SYMBOL(__setup_end) = .; 652 653 #define INIT_CALLS_LEVEL(level) \ 654 VMLINUX_SYMBOL(__initcall##level##_start) = .; \ 655 *(.initcall##level##.init) \ 656 *(.initcall##level##s.init) \ 657 658 #define INIT_CALLS \ 659 VMLINUX_SYMBOL(__initcall_start) = .; \ 660 *(.initcallearly.init) \ 661 INIT_CALLS_LEVEL(0) \ 662 INIT_CALLS_LEVEL(1) \ 663 INIT_CALLS_LEVEL(2) \ 664 INIT_CALLS_LEVEL(3) \ 665 INIT_CALLS_LEVEL(4) \ 666 INIT_CALLS_LEVEL(5) \ 667 INIT_CALLS_LEVEL(rootfs) \ 668 INIT_CALLS_LEVEL(6) \ 669 INIT_CALLS_LEVEL(7) \ 670 VMLINUX_SYMBOL(__initcall_end) = .; 671 672 #define CON_INITCALL \ 673 VMLINUX_SYMBOL(__con_initcall_start) = .; \ 674 *(.con_initcall.init) \ 675 VMLINUX_SYMBOL(__con_initcall_end) = .; 676 677 #define SECURITY_INITCALL \ 678 VMLINUX_SYMBOL(__security_initcall_start) = .; \ 679 *(.security_initcall.init) \ 680 VMLINUX_SYMBOL(__security_initcall_end) = .; 681 682 #ifdef CONFIG_BLK_DEV_INITRD 683 #define INIT_RAM_FS \ 684 . = ALIGN(4); \ 685 VMLINUX_SYMBOL(__initramfs_start) = .; \ 686 *(.init.ramfs) \ 687 . = ALIGN(8); \ 688 *(.init.ramfs.info) 689 #else 690 #define INIT_RAM_FS 691 #endif 692 693 /* 694 * Default discarded sections. 695 * 696 * Some archs want to discard exit text/data at runtime rather than 697 * link time due to cross-section references such as alt instructions, 698 * bug table, eh_frame, etc. DISCARDS must be the last of output 699 * section definitions so that such archs put those in earlier section 700 * definitions. 701 */ 702 #define DISCARDS \ 703 /DISCARD/ : { \ 704 EXIT_TEXT \ 705 EXIT_DATA \ 706 EXIT_CALL \ 707 *(.discard) \ 708 *(.discard.*) \ 709 } 710 711 /** 712 * PERCPU_INPUT - the percpu input sections 713 * @cacheline: cacheline size 714 * 715 * The core percpu section names and core symbols which do not rely 716 * directly upon load addresses. 717 * 718 * @cacheline is used to align subsections to avoid false cacheline 719 * sharing between subsections for different purposes. 720 */ 721 #define PERCPU_INPUT(cacheline) \ 722 VMLINUX_SYMBOL(__per_cpu_start) = .; \ 723 *(.data..percpu..first) \ 724 . = ALIGN(PAGE_SIZE); \ 725 *(.data..percpu..page_aligned) \ 726 . = ALIGN(cacheline); \ 727 *(.data..percpu..read_mostly) \ 728 . = ALIGN(cacheline); \ 729 *(.data..percpu) \ 730 *(.data..percpu..shared_aligned) \ 731 VMLINUX_SYMBOL(__per_cpu_end) = .; 732 733 /** 734 * PERCPU_VADDR - define output section for percpu area 735 * @cacheline: cacheline size 736 * @vaddr: explicit base address (optional) 737 * @phdr: destination PHDR (optional) 738 * 739 * Macro which expands to output section for percpu area. 740 * 741 * @cacheline is used to align subsections to avoid false cacheline 742 * sharing between subsections for different purposes. 743 * 744 * If @vaddr is not blank, it specifies explicit base address and all 745 * percpu symbols will be offset from the given address. If blank, 746 * @vaddr always equals @laddr + LOAD_OFFSET. 747 * 748 * @phdr defines the output PHDR to use if not blank. Be warned that 749 * output PHDR is sticky. If @phdr is specified, the next output 750 * section in the linker script will go there too. @phdr should have 751 * a leading colon. 752 * 753 * Note that this macros defines __per_cpu_load as an absolute symbol. 754 * If there is no need to put the percpu section at a predetermined 755 * address, use PERCPU_SECTION. 756 */ 757 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 758 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 759 .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load) \ 760 - LOAD_OFFSET) { \ 761 PERCPU_INPUT(cacheline) \ 762 } phdr \ 763 . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu); 764 765 /** 766 * PERCPU_SECTION - define output section for percpu area, simple version 767 * @cacheline: cacheline size 768 * 769 * Align to PAGE_SIZE and outputs output section for percpu area. This 770 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 771 * __per_cpu_start will be identical. 772 * 773 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 774 * except that __per_cpu_load is defined as a relative symbol against 775 * .data..percpu which is required for relocatable x86_32 configuration. 776 */ 777 #define PERCPU_SECTION(cacheline) \ 778 . = ALIGN(PAGE_SIZE); \ 779 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 780 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 781 PERCPU_INPUT(cacheline) \ 782 } 783 784 785 /* 786 * Definition of the high level *_SECTION macros 787 * They will fit only a subset of the architectures 788 */ 789 790 791 /* 792 * Writeable data. 793 * All sections are combined in a single .data section. 794 * The sections following CONSTRUCTORS are arranged so their 795 * typical alignment matches. 796 * A cacheline is typical/always less than a PAGE_SIZE so 797 * the sections that has this restriction (or similar) 798 * is located before the ones requiring PAGE_SIZE alignment. 799 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 800 * matches the requirement of PAGE_ALIGNED_DATA. 801 * 802 * use 0 as page_align if page_aligned data is not used */ 803 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \ 804 . = ALIGN(PAGE_SIZE); \ 805 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 806 INIT_TASK_DATA(inittask) \ 807 NOSAVE_DATA \ 808 PAGE_ALIGNED_DATA(pagealigned) \ 809 CACHELINE_ALIGNED_DATA(cacheline) \ 810 READ_MOSTLY_DATA(cacheline) \ 811 DATA_DATA \ 812 CONSTRUCTORS \ 813 } 814 815 #define INIT_TEXT_SECTION(inittext_align) \ 816 . = ALIGN(inittext_align); \ 817 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 818 VMLINUX_SYMBOL(_sinittext) = .; \ 819 INIT_TEXT \ 820 VMLINUX_SYMBOL(_einittext) = .; \ 821 } 822 823 #define INIT_DATA_SECTION(initsetup_align) \ 824 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 825 INIT_DATA \ 826 INIT_SETUP(initsetup_align) \ 827 INIT_CALLS \ 828 CON_INITCALL \ 829 SECURITY_INITCALL \ 830 INIT_RAM_FS \ 831 } 832 833 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 834 . = ALIGN(sbss_align); \ 835 VMLINUX_SYMBOL(__bss_start) = .; \ 836 SBSS(sbss_align) \ 837 BSS(bss_align) \ 838 . = ALIGN(stop_align); \ 839 VMLINUX_SYMBOL(__bss_stop) = .; 840