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