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(IS_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 /* 200 * .data section 201 * LD_DEAD_CODE_DATA_ELIMINATION option enables -fdata-sections generates 202 * .data.identifier which needs to be pulled in with .data, but don't want to 203 * pull in .data..stuff which has its own requirements. Same for bss. 204 */ 205 #define DATA_DATA \ 206 *(.data .data.[0-9a-zA-Z_]*) \ 207 *(.ref.data) \ 208 *(.data..shared_aligned) /* percpu related */ \ 209 MEM_KEEP(init.data) \ 210 MEM_KEEP(exit.data) \ 211 *(.data.unlikely) \ 212 STRUCT_ALIGN(); \ 213 *(__tracepoints) \ 214 /* implement dynamic printk debug */ \ 215 . = ALIGN(8); \ 216 VMLINUX_SYMBOL(__start___jump_table) = .; \ 217 *(__jump_table) \ 218 VMLINUX_SYMBOL(__stop___jump_table) = .; \ 219 . = ALIGN(8); \ 220 VMLINUX_SYMBOL(__start___verbose) = .; \ 221 *(__verbose) \ 222 VMLINUX_SYMBOL(__stop___verbose) = .; \ 223 LIKELY_PROFILE() \ 224 BRANCH_PROFILE() \ 225 TRACE_PRINTKS() \ 226 TRACEPOINT_STR() 227 228 /* 229 * Data section helpers 230 */ 231 #define NOSAVE_DATA \ 232 . = ALIGN(PAGE_SIZE); \ 233 VMLINUX_SYMBOL(__nosave_begin) = .; \ 234 *(.data..nosave) \ 235 . = ALIGN(PAGE_SIZE); \ 236 VMLINUX_SYMBOL(__nosave_end) = .; 237 238 #define PAGE_ALIGNED_DATA(page_align) \ 239 . = ALIGN(page_align); \ 240 *(.data..page_aligned) 241 242 #define READ_MOSTLY_DATA(align) \ 243 . = ALIGN(align); \ 244 *(.data..read_mostly) \ 245 . = ALIGN(align); 246 247 #define CACHELINE_ALIGNED_DATA(align) \ 248 . = ALIGN(align); \ 249 *(.data..cacheline_aligned) 250 251 #define INIT_TASK_DATA(align) \ 252 . = ALIGN(align); \ 253 VMLINUX_SYMBOL(__start_init_task) = .; \ 254 *(.data..init_task) \ 255 VMLINUX_SYMBOL(__end_init_task) = .; 256 257 /* 258 * Allow architectures to handle ro_after_init data on their 259 * own by defining an empty RO_AFTER_INIT_DATA. 260 */ 261 #ifndef RO_AFTER_INIT_DATA 262 #define RO_AFTER_INIT_DATA \ 263 __start_data_ro_after_init = .; \ 264 *(.data..ro_after_init) \ 265 __end_data_ro_after_init = .; 266 #endif 267 268 /* 269 * Read only Data 270 */ 271 #define RO_DATA_SECTION(align) \ 272 . = ALIGN((align)); \ 273 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 274 VMLINUX_SYMBOL(__start_rodata) = .; \ 275 *(.rodata) *(.rodata.*) \ 276 RO_AFTER_INIT_DATA /* Read only after init */ \ 277 *(__vermagic) /* Kernel version magic */ \ 278 . = ALIGN(8); \ 279 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .; \ 280 *(__tracepoints_ptrs) /* Tracepoints: pointer array */\ 281 VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .; \ 282 *(__tracepoints_strings)/* Tracepoints: strings */ \ 283 } \ 284 \ 285 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 286 *(.rodata1) \ 287 } \ 288 \ 289 BUG_TABLE \ 290 \ 291 /* PCI quirks */ \ 292 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 293 VMLINUX_SYMBOL(__start_pci_fixups_early) = .; \ 294 *(.pci_fixup_early) \ 295 VMLINUX_SYMBOL(__end_pci_fixups_early) = .; \ 296 VMLINUX_SYMBOL(__start_pci_fixups_header) = .; \ 297 *(.pci_fixup_header) \ 298 VMLINUX_SYMBOL(__end_pci_fixups_header) = .; \ 299 VMLINUX_SYMBOL(__start_pci_fixups_final) = .; \ 300 *(.pci_fixup_final) \ 301 VMLINUX_SYMBOL(__end_pci_fixups_final) = .; \ 302 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .; \ 303 *(.pci_fixup_enable) \ 304 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .; \ 305 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .; \ 306 *(.pci_fixup_resume) \ 307 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .; \ 308 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .; \ 309 *(.pci_fixup_resume_early) \ 310 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .; \ 311 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .; \ 312 *(.pci_fixup_suspend) \ 313 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .; \ 314 VMLINUX_SYMBOL(__start_pci_fixups_suspend_late) = .; \ 315 *(.pci_fixup_suspend_late) \ 316 VMLINUX_SYMBOL(__end_pci_fixups_suspend_late) = .; \ 317 } \ 318 \ 319 /* Built-in firmware blobs */ \ 320 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \ 321 VMLINUX_SYMBOL(__start_builtin_fw) = .; \ 322 *(.builtin_fw) \ 323 VMLINUX_SYMBOL(__end_builtin_fw) = .; \ 324 } \ 325 \ 326 TRACEDATA \ 327 \ 328 /* Kernel symbol table: Normal symbols */ \ 329 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 330 VMLINUX_SYMBOL(__start___ksymtab) = .; \ 331 KEEP(*(SORT(___ksymtab+*))) \ 332 VMLINUX_SYMBOL(__stop___ksymtab) = .; \ 333 } \ 334 \ 335 /* Kernel symbol table: GPL-only symbols */ \ 336 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 337 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .; \ 338 KEEP(*(SORT(___ksymtab_gpl+*))) \ 339 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .; \ 340 } \ 341 \ 342 /* Kernel symbol table: Normal unused symbols */ \ 343 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \ 344 VMLINUX_SYMBOL(__start___ksymtab_unused) = .; \ 345 KEEP(*(SORT(___ksymtab_unused+*))) \ 346 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .; \ 347 } \ 348 \ 349 /* Kernel symbol table: GPL-only unused symbols */ \ 350 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \ 351 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .; \ 352 KEEP(*(SORT(___ksymtab_unused_gpl+*))) \ 353 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .; \ 354 } \ 355 \ 356 /* Kernel symbol table: GPL-future-only symbols */ \ 357 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \ 358 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .; \ 359 KEEP(*(SORT(___ksymtab_gpl_future+*))) \ 360 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .; \ 361 } \ 362 \ 363 /* Kernel symbol table: Normal symbols */ \ 364 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 365 VMLINUX_SYMBOL(__start___kcrctab) = .; \ 366 KEEP(*(SORT(___kcrctab+*))) \ 367 VMLINUX_SYMBOL(__stop___kcrctab) = .; \ 368 } \ 369 \ 370 /* Kernel symbol table: GPL-only symbols */ \ 371 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 372 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .; \ 373 KEEP(*(SORT(___kcrctab_gpl+*))) \ 374 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .; \ 375 } \ 376 \ 377 /* Kernel symbol table: Normal unused symbols */ \ 378 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \ 379 VMLINUX_SYMBOL(__start___kcrctab_unused) = .; \ 380 KEEP(*(SORT(___kcrctab_unused+*))) \ 381 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .; \ 382 } \ 383 \ 384 /* Kernel symbol table: GPL-only unused symbols */ \ 385 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \ 386 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .; \ 387 KEEP(*(SORT(___kcrctab_unused_gpl+*))) \ 388 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .; \ 389 } \ 390 \ 391 /* Kernel symbol table: GPL-future-only symbols */ \ 392 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \ 393 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .; \ 394 KEEP(*(SORT(___kcrctab_gpl_future+*))) \ 395 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .; \ 396 } \ 397 \ 398 /* Kernel symbol table: strings */ \ 399 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 400 KEEP(*(__ksymtab_strings)) \ 401 } \ 402 \ 403 /* __*init sections */ \ 404 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 405 *(.ref.rodata) \ 406 MEM_KEEP(init.rodata) \ 407 MEM_KEEP(exit.rodata) \ 408 } \ 409 \ 410 /* Built-in module parameters. */ \ 411 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 412 VMLINUX_SYMBOL(__start___param) = .; \ 413 *(__param) \ 414 VMLINUX_SYMBOL(__stop___param) = .; \ 415 } \ 416 \ 417 /* Built-in module versions. */ \ 418 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 419 VMLINUX_SYMBOL(__start___modver) = .; \ 420 *(__modver) \ 421 VMLINUX_SYMBOL(__stop___modver) = .; \ 422 . = ALIGN((align)); \ 423 VMLINUX_SYMBOL(__end_rodata) = .; \ 424 } \ 425 . = ALIGN((align)); 426 427 /* RODATA & RO_DATA provided for backward compatibility. 428 * All archs are supposed to use RO_DATA() */ 429 #define RODATA RO_DATA_SECTION(4096) 430 #define RO_DATA(align) RO_DATA_SECTION(align) 431 432 #define SECURITY_INIT \ 433 .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \ 434 VMLINUX_SYMBOL(__security_initcall_start) = .; \ 435 KEEP(*(.security_initcall.init)) \ 436 VMLINUX_SYMBOL(__security_initcall_end) = .; \ 437 } 438 439 /* .text section. Map to function alignment to avoid address changes 440 * during second ld run in second ld pass when generating System.map 441 * LD_DEAD_CODE_DATA_ELIMINATION option enables -ffunction-sections generates 442 * .text.identifier which needs to be pulled in with .text , but some 443 * architectures define .text.foo which is not intended to be pulled in here. 444 * Those enabling LD_DEAD_CODE_DATA_ELIMINATION must ensure they don't have 445 * conflicting section names, and must pull in .text.[0-9a-zA-Z_]* */ 446 #define TEXT_TEXT \ 447 ALIGN_FUNCTION(); \ 448 *(.text.hot .text .text.fixup .text.unlikely) \ 449 *(.ref.text) \ 450 MEM_KEEP(init.text) \ 451 MEM_KEEP(exit.text) \ 452 453 454 /* sched.text is aling to function alignment to secure we have same 455 * address even at second ld pass when generating System.map */ 456 #define SCHED_TEXT \ 457 ALIGN_FUNCTION(); \ 458 VMLINUX_SYMBOL(__sched_text_start) = .; \ 459 *(.sched.text) \ 460 VMLINUX_SYMBOL(__sched_text_end) = .; 461 462 /* spinlock.text is aling to function alignment to secure we have same 463 * address even at second ld pass when generating System.map */ 464 #define LOCK_TEXT \ 465 ALIGN_FUNCTION(); \ 466 VMLINUX_SYMBOL(__lock_text_start) = .; \ 467 *(.spinlock.text) \ 468 VMLINUX_SYMBOL(__lock_text_end) = .; 469 470 #define CPUIDLE_TEXT \ 471 ALIGN_FUNCTION(); \ 472 VMLINUX_SYMBOL(__cpuidle_text_start) = .; \ 473 *(.cpuidle.text) \ 474 VMLINUX_SYMBOL(__cpuidle_text_end) = .; 475 476 #define KPROBES_TEXT \ 477 ALIGN_FUNCTION(); \ 478 VMLINUX_SYMBOL(__kprobes_text_start) = .; \ 479 *(.kprobes.text) \ 480 VMLINUX_SYMBOL(__kprobes_text_end) = .; 481 482 #define ENTRY_TEXT \ 483 ALIGN_FUNCTION(); \ 484 VMLINUX_SYMBOL(__entry_text_start) = .; \ 485 *(.entry.text) \ 486 VMLINUX_SYMBOL(__entry_text_end) = .; 487 488 #if defined(CONFIG_FUNCTION_GRAPH_TRACER) || defined(CONFIG_KASAN) 489 #define IRQENTRY_TEXT \ 490 ALIGN_FUNCTION(); \ 491 VMLINUX_SYMBOL(__irqentry_text_start) = .; \ 492 *(.irqentry.text) \ 493 VMLINUX_SYMBOL(__irqentry_text_end) = .; 494 #else 495 #define IRQENTRY_TEXT 496 #endif 497 498 #if defined(CONFIG_FUNCTION_GRAPH_TRACER) || defined(CONFIG_KASAN) 499 #define SOFTIRQENTRY_TEXT \ 500 ALIGN_FUNCTION(); \ 501 VMLINUX_SYMBOL(__softirqentry_text_start) = .; \ 502 *(.softirqentry.text) \ 503 VMLINUX_SYMBOL(__softirqentry_text_end) = .; 504 #else 505 #define SOFTIRQENTRY_TEXT 506 #endif 507 508 /* Section used for early init (in .S files) */ 509 #define HEAD_TEXT *(.head.text) 510 511 #define HEAD_TEXT_SECTION \ 512 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 513 HEAD_TEXT \ 514 } 515 516 /* 517 * Exception table 518 */ 519 #define EXCEPTION_TABLE(align) \ 520 . = ALIGN(align); \ 521 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 522 VMLINUX_SYMBOL(__start___ex_table) = .; \ 523 *(__ex_table) \ 524 VMLINUX_SYMBOL(__stop___ex_table) = .; \ 525 } 526 527 /* 528 * Init task 529 */ 530 #define INIT_TASK_DATA_SECTION(align) \ 531 . = ALIGN(align); \ 532 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 533 INIT_TASK_DATA(align) \ 534 } 535 536 #ifdef CONFIG_CONSTRUCTORS 537 #define KERNEL_CTORS() . = ALIGN(8); \ 538 VMLINUX_SYMBOL(__ctors_start) = .; \ 539 *(.ctors) \ 540 *(SORT(.init_array.*)) \ 541 *(.init_array) \ 542 VMLINUX_SYMBOL(__ctors_end) = .; 543 #else 544 #define KERNEL_CTORS() 545 #endif 546 547 /* init and exit section handling */ 548 #define INIT_DATA \ 549 KEEP(*(SORT(___kentry+*))) \ 550 *(.init.data) \ 551 MEM_DISCARD(init.data) \ 552 KERNEL_CTORS() \ 553 MCOUNT_REC() \ 554 *(.init.rodata) \ 555 FTRACE_EVENTS() \ 556 TRACE_SYSCALLS() \ 557 KPROBE_BLACKLIST() \ 558 MEM_DISCARD(init.rodata) \ 559 CLK_OF_TABLES() \ 560 RESERVEDMEM_OF_TABLES() \ 561 CLKSRC_OF_TABLES() \ 562 IOMMU_OF_TABLES() \ 563 CPU_METHOD_OF_TABLES() \ 564 CPUIDLE_METHOD_OF_TABLES() \ 565 KERNEL_DTB() \ 566 IRQCHIP_OF_MATCH_TABLE() \ 567 ACPI_PROBE_TABLE(irqchip) \ 568 ACPI_PROBE_TABLE(clksrc) \ 569 EARLYCON_TABLE() 570 571 #define INIT_TEXT \ 572 *(.init.text) \ 573 *(.text.startup) \ 574 MEM_DISCARD(init.text) 575 576 #define EXIT_DATA \ 577 *(.exit.data) \ 578 *(.fini_array) \ 579 *(.dtors) \ 580 MEM_DISCARD(exit.data) \ 581 MEM_DISCARD(exit.rodata) 582 583 #define EXIT_TEXT \ 584 *(.exit.text) \ 585 *(.text.exit) \ 586 MEM_DISCARD(exit.text) 587 588 #define EXIT_CALL \ 589 *(.exitcall.exit) 590 591 /* 592 * bss (Block Started by Symbol) - uninitialized data 593 * zeroed during startup 594 */ 595 #define SBSS(sbss_align) \ 596 . = ALIGN(sbss_align); \ 597 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 598 *(.sbss) \ 599 *(.scommon) \ 600 } 601 602 /* 603 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 604 * sections to the front of bss. 605 */ 606 #ifndef BSS_FIRST_SECTIONS 607 #define BSS_FIRST_SECTIONS 608 #endif 609 610 #define BSS(bss_align) \ 611 . = ALIGN(bss_align); \ 612 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 613 BSS_FIRST_SECTIONS \ 614 *(.bss..page_aligned) \ 615 *(.dynbss) \ 616 *(.bss .bss.[0-9a-zA-Z_]*) \ 617 *(COMMON) \ 618 } 619 620 /* 621 * DWARF debug sections. 622 * Symbols in the DWARF debugging sections are relative to 623 * the beginning of the section so we begin them at 0. 624 */ 625 #define DWARF_DEBUG \ 626 /* DWARF 1 */ \ 627 .debug 0 : { *(.debug) } \ 628 .line 0 : { *(.line) } \ 629 /* GNU DWARF 1 extensions */ \ 630 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 631 .debug_sfnames 0 : { *(.debug_sfnames) } \ 632 /* DWARF 1.1 and DWARF 2 */ \ 633 .debug_aranges 0 : { *(.debug_aranges) } \ 634 .debug_pubnames 0 : { *(.debug_pubnames) } \ 635 /* DWARF 2 */ \ 636 .debug_info 0 : { *(.debug_info \ 637 .gnu.linkonce.wi.*) } \ 638 .debug_abbrev 0 : { *(.debug_abbrev) } \ 639 .debug_line 0 : { *(.debug_line) } \ 640 .debug_frame 0 : { *(.debug_frame) } \ 641 .debug_str 0 : { *(.debug_str) } \ 642 .debug_loc 0 : { *(.debug_loc) } \ 643 .debug_macinfo 0 : { *(.debug_macinfo) } \ 644 /* SGI/MIPS DWARF 2 extensions */ \ 645 .debug_weaknames 0 : { *(.debug_weaknames) } \ 646 .debug_funcnames 0 : { *(.debug_funcnames) } \ 647 .debug_typenames 0 : { *(.debug_typenames) } \ 648 .debug_varnames 0 : { *(.debug_varnames) } \ 649 650 /* Stabs debugging sections. */ 651 #define STABS_DEBUG \ 652 .stab 0 : { *(.stab) } \ 653 .stabstr 0 : { *(.stabstr) } \ 654 .stab.excl 0 : { *(.stab.excl) } \ 655 .stab.exclstr 0 : { *(.stab.exclstr) } \ 656 .stab.index 0 : { *(.stab.index) } \ 657 .stab.indexstr 0 : { *(.stab.indexstr) } \ 658 .comment 0 : { *(.comment) } 659 660 #ifdef CONFIG_GENERIC_BUG 661 #define BUG_TABLE \ 662 . = ALIGN(8); \ 663 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 664 VMLINUX_SYMBOL(__start___bug_table) = .; \ 665 *(__bug_table) \ 666 VMLINUX_SYMBOL(__stop___bug_table) = .; \ 667 } 668 #else 669 #define BUG_TABLE 670 #endif 671 672 #ifdef CONFIG_PM_TRACE 673 #define TRACEDATA \ 674 . = ALIGN(4); \ 675 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 676 VMLINUX_SYMBOL(__tracedata_start) = .; \ 677 *(.tracedata) \ 678 VMLINUX_SYMBOL(__tracedata_end) = .; \ 679 } 680 #else 681 #define TRACEDATA 682 #endif 683 684 #define NOTES \ 685 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 686 VMLINUX_SYMBOL(__start_notes) = .; \ 687 *(.note.*) \ 688 VMLINUX_SYMBOL(__stop_notes) = .; \ 689 } 690 691 #define INIT_SETUP(initsetup_align) \ 692 . = ALIGN(initsetup_align); \ 693 VMLINUX_SYMBOL(__setup_start) = .; \ 694 *(.init.setup) \ 695 VMLINUX_SYMBOL(__setup_end) = .; 696 697 #define INIT_CALLS_LEVEL(level) \ 698 VMLINUX_SYMBOL(__initcall##level##_start) = .; \ 699 KEEP(*(.initcall##level##.init)) \ 700 KEEP(*(.initcall##level##s.init)) \ 701 702 #define INIT_CALLS \ 703 VMLINUX_SYMBOL(__initcall_start) = .; \ 704 KEEP(*(.initcallearly.init)) \ 705 INIT_CALLS_LEVEL(0) \ 706 INIT_CALLS_LEVEL(1) \ 707 INIT_CALLS_LEVEL(2) \ 708 INIT_CALLS_LEVEL(3) \ 709 INIT_CALLS_LEVEL(4) \ 710 INIT_CALLS_LEVEL(5) \ 711 INIT_CALLS_LEVEL(rootfs) \ 712 INIT_CALLS_LEVEL(6) \ 713 INIT_CALLS_LEVEL(7) \ 714 VMLINUX_SYMBOL(__initcall_end) = .; 715 716 #define CON_INITCALL \ 717 VMLINUX_SYMBOL(__con_initcall_start) = .; \ 718 KEEP(*(.con_initcall.init)) \ 719 VMLINUX_SYMBOL(__con_initcall_end) = .; 720 721 #define SECURITY_INITCALL \ 722 VMLINUX_SYMBOL(__security_initcall_start) = .; \ 723 KEEP(*(.security_initcall.init)) \ 724 VMLINUX_SYMBOL(__security_initcall_end) = .; 725 726 #ifdef CONFIG_BLK_DEV_INITRD 727 #define INIT_RAM_FS \ 728 . = ALIGN(4); \ 729 VMLINUX_SYMBOL(__initramfs_start) = .; \ 730 KEEP(*(.init.ramfs)) \ 731 . = ALIGN(8); \ 732 KEEP(*(.init.ramfs.info)) 733 #else 734 #define INIT_RAM_FS 735 #endif 736 737 /* 738 * Default discarded sections. 739 * 740 * Some archs want to discard exit text/data at runtime rather than 741 * link time due to cross-section references such as alt instructions, 742 * bug table, eh_frame, etc. DISCARDS must be the last of output 743 * section definitions so that such archs put those in earlier section 744 * definitions. 745 */ 746 #define DISCARDS \ 747 /DISCARD/ : { \ 748 EXIT_TEXT \ 749 EXIT_DATA \ 750 EXIT_CALL \ 751 *(.discard) \ 752 *(.discard.*) \ 753 } 754 755 /** 756 * PERCPU_INPUT - the percpu input sections 757 * @cacheline: cacheline size 758 * 759 * The core percpu section names and core symbols which do not rely 760 * directly upon load addresses. 761 * 762 * @cacheline is used to align subsections to avoid false cacheline 763 * sharing between subsections for different purposes. 764 */ 765 #define PERCPU_INPUT(cacheline) \ 766 VMLINUX_SYMBOL(__per_cpu_start) = .; \ 767 *(.data..percpu..first) \ 768 . = ALIGN(PAGE_SIZE); \ 769 *(.data..percpu..page_aligned) \ 770 . = ALIGN(cacheline); \ 771 *(.data..percpu..read_mostly) \ 772 . = ALIGN(cacheline); \ 773 *(.data..percpu) \ 774 *(.data..percpu..shared_aligned) \ 775 VMLINUX_SYMBOL(__per_cpu_end) = .; 776 777 /** 778 * PERCPU_VADDR - define output section for percpu area 779 * @cacheline: cacheline size 780 * @vaddr: explicit base address (optional) 781 * @phdr: destination PHDR (optional) 782 * 783 * Macro which expands to output section for percpu area. 784 * 785 * @cacheline is used to align subsections to avoid false cacheline 786 * sharing between subsections for different purposes. 787 * 788 * If @vaddr is not blank, it specifies explicit base address and all 789 * percpu symbols will be offset from the given address. If blank, 790 * @vaddr always equals @laddr + LOAD_OFFSET. 791 * 792 * @phdr defines the output PHDR to use if not blank. Be warned that 793 * output PHDR is sticky. If @phdr is specified, the next output 794 * section in the linker script will go there too. @phdr should have 795 * a leading colon. 796 * 797 * Note that this macros defines __per_cpu_load as an absolute symbol. 798 * If there is no need to put the percpu section at a predetermined 799 * address, use PERCPU_SECTION. 800 */ 801 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 802 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 803 .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load) \ 804 - LOAD_OFFSET) { \ 805 PERCPU_INPUT(cacheline) \ 806 } phdr \ 807 . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu); 808 809 /** 810 * PERCPU_SECTION - define output section for percpu area, simple version 811 * @cacheline: cacheline size 812 * 813 * Align to PAGE_SIZE and outputs output section for percpu area. This 814 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 815 * __per_cpu_start will be identical. 816 * 817 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 818 * except that __per_cpu_load is defined as a relative symbol against 819 * .data..percpu which is required for relocatable x86_32 configuration. 820 */ 821 #define PERCPU_SECTION(cacheline) \ 822 . = ALIGN(PAGE_SIZE); \ 823 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 824 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 825 PERCPU_INPUT(cacheline) \ 826 } 827 828 829 /* 830 * Definition of the high level *_SECTION macros 831 * They will fit only a subset of the architectures 832 */ 833 834 835 /* 836 * Writeable data. 837 * All sections are combined in a single .data section. 838 * The sections following CONSTRUCTORS are arranged so their 839 * typical alignment matches. 840 * A cacheline is typical/always less than a PAGE_SIZE so 841 * the sections that has this restriction (or similar) 842 * is located before the ones requiring PAGE_SIZE alignment. 843 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 844 * matches the requirement of PAGE_ALIGNED_DATA. 845 * 846 * use 0 as page_align if page_aligned data is not used */ 847 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \ 848 . = ALIGN(PAGE_SIZE); \ 849 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 850 INIT_TASK_DATA(inittask) \ 851 NOSAVE_DATA \ 852 PAGE_ALIGNED_DATA(pagealigned) \ 853 CACHELINE_ALIGNED_DATA(cacheline) \ 854 READ_MOSTLY_DATA(cacheline) \ 855 DATA_DATA \ 856 CONSTRUCTORS \ 857 } 858 859 #define INIT_TEXT_SECTION(inittext_align) \ 860 . = ALIGN(inittext_align); \ 861 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 862 VMLINUX_SYMBOL(_sinittext) = .; \ 863 INIT_TEXT \ 864 VMLINUX_SYMBOL(_einittext) = .; \ 865 } 866 867 #define INIT_DATA_SECTION(initsetup_align) \ 868 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 869 INIT_DATA \ 870 INIT_SETUP(initsetup_align) \ 871 INIT_CALLS \ 872 CON_INITCALL \ 873 SECURITY_INITCALL \ 874 INIT_RAM_FS \ 875 } 876 877 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 878 . = ALIGN(sbss_align); \ 879 VMLINUX_SYMBOL(__bss_start) = .; \ 880 SBSS(sbss_align) \ 881 BSS(bss_align) \ 882 . = ALIGN(stop_align); \ 883 VMLINUX_SYMBOL(__bss_stop) = .; 884