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 KEEP(*(_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 KEEP(*(_ftrace_events)) \ 127 VMLINUX_SYMBOL(__stop_ftrace_events) = .; \ 128 VMLINUX_SYMBOL(__start_ftrace_eval_maps) = .; \ 129 KEEP(*(_ftrace_eval_map)) \ 130 VMLINUX_SYMBOL(__stop_ftrace_eval_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 KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \ 138 VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .; 139 #define TRACEPOINT_STR() VMLINUX_SYMBOL(__start___tracepoint_str) = .; \ 140 KEEP(*(__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 KEEP(*(__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 KEEP(*(__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 KEEP(*(__##name##_of_table)) \ 173 KEEP(*(__##name##_of_table_end)) 174 175 #define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer) 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 KEEP(*(__##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 KEEP(*(.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 KEEP(*(__jump_table)) \ 218 VMLINUX_SYMBOL(__stop___jump_table) = .; \ 219 . = ALIGN(8); \ 220 VMLINUX_SYMBOL(__start___verbose) = .; \ 221 KEEP(*(__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 VMLINUX_SYMBOL(__start_ro_after_init) = .; \ 264 *(.data..ro_after_init) \ 265 VMLINUX_SYMBOL(__end_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 KEEP(*(__vermagic)) /* Kernel version magic */ \ 278 . = ALIGN(8); \ 279 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .; \ 280 KEEP(*(__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 /* PCI quirks */ \ 290 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 291 VMLINUX_SYMBOL(__start_pci_fixups_early) = .; \ 292 KEEP(*(.pci_fixup_early)) \ 293 VMLINUX_SYMBOL(__end_pci_fixups_early) = .; \ 294 VMLINUX_SYMBOL(__start_pci_fixups_header) = .; \ 295 KEEP(*(.pci_fixup_header)) \ 296 VMLINUX_SYMBOL(__end_pci_fixups_header) = .; \ 297 VMLINUX_SYMBOL(__start_pci_fixups_final) = .; \ 298 KEEP(*(.pci_fixup_final)) \ 299 VMLINUX_SYMBOL(__end_pci_fixups_final) = .; \ 300 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .; \ 301 KEEP(*(.pci_fixup_enable)) \ 302 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .; \ 303 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .; \ 304 KEEP(*(.pci_fixup_resume)) \ 305 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .; \ 306 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .; \ 307 KEEP(*(.pci_fixup_resume_early)) \ 308 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .; \ 309 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .; \ 310 KEEP(*(.pci_fixup_suspend)) \ 311 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .; \ 312 VMLINUX_SYMBOL(__start_pci_fixups_suspend_late) = .; \ 313 KEEP(*(.pci_fixup_suspend_late)) \ 314 VMLINUX_SYMBOL(__end_pci_fixups_suspend_late) = .; \ 315 } \ 316 \ 317 /* Built-in firmware blobs */ \ 318 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \ 319 VMLINUX_SYMBOL(__start_builtin_fw) = .; \ 320 KEEP(*(.builtin_fw)) \ 321 VMLINUX_SYMBOL(__end_builtin_fw) = .; \ 322 } \ 323 \ 324 TRACEDATA \ 325 \ 326 /* Kernel symbol table: Normal symbols */ \ 327 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 328 VMLINUX_SYMBOL(__start___ksymtab) = .; \ 329 KEEP(*(SORT(___ksymtab+*))) \ 330 VMLINUX_SYMBOL(__stop___ksymtab) = .; \ 331 } \ 332 \ 333 /* Kernel symbol table: GPL-only symbols */ \ 334 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 335 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .; \ 336 KEEP(*(SORT(___ksymtab_gpl+*))) \ 337 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .; \ 338 } \ 339 \ 340 /* Kernel symbol table: Normal unused symbols */ \ 341 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \ 342 VMLINUX_SYMBOL(__start___ksymtab_unused) = .; \ 343 KEEP(*(SORT(___ksymtab_unused+*))) \ 344 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .; \ 345 } \ 346 \ 347 /* Kernel symbol table: GPL-only unused symbols */ \ 348 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \ 349 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .; \ 350 KEEP(*(SORT(___ksymtab_unused_gpl+*))) \ 351 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .; \ 352 } \ 353 \ 354 /* Kernel symbol table: GPL-future-only symbols */ \ 355 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \ 356 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .; \ 357 KEEP(*(SORT(___ksymtab_gpl_future+*))) \ 358 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .; \ 359 } \ 360 \ 361 /* Kernel symbol table: Normal symbols */ \ 362 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 363 VMLINUX_SYMBOL(__start___kcrctab) = .; \ 364 KEEP(*(SORT(___kcrctab+*))) \ 365 VMLINUX_SYMBOL(__stop___kcrctab) = .; \ 366 } \ 367 \ 368 /* Kernel symbol table: GPL-only symbols */ \ 369 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 370 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .; \ 371 KEEP(*(SORT(___kcrctab_gpl+*))) \ 372 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .; \ 373 } \ 374 \ 375 /* Kernel symbol table: Normal unused symbols */ \ 376 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \ 377 VMLINUX_SYMBOL(__start___kcrctab_unused) = .; \ 378 KEEP(*(SORT(___kcrctab_unused+*))) \ 379 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .; \ 380 } \ 381 \ 382 /* Kernel symbol table: GPL-only unused symbols */ \ 383 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \ 384 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .; \ 385 KEEP(*(SORT(___kcrctab_unused_gpl+*))) \ 386 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .; \ 387 } \ 388 \ 389 /* Kernel symbol table: GPL-future-only symbols */ \ 390 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \ 391 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .; \ 392 KEEP(*(SORT(___kcrctab_gpl_future+*))) \ 393 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .; \ 394 } \ 395 \ 396 /* Kernel symbol table: strings */ \ 397 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 398 *(__ksymtab_strings) \ 399 } \ 400 \ 401 /* __*init sections */ \ 402 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 403 *(.ref.rodata) \ 404 MEM_KEEP(init.rodata) \ 405 MEM_KEEP(exit.rodata) \ 406 } \ 407 \ 408 /* Built-in module parameters. */ \ 409 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 410 VMLINUX_SYMBOL(__start___param) = .; \ 411 KEEP(*(__param)) \ 412 VMLINUX_SYMBOL(__stop___param) = .; \ 413 } \ 414 \ 415 /* Built-in module versions. */ \ 416 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 417 VMLINUX_SYMBOL(__start___modver) = .; \ 418 KEEP(*(__modver)) \ 419 VMLINUX_SYMBOL(__stop___modver) = .; \ 420 . = ALIGN((align)); \ 421 VMLINUX_SYMBOL(__end_rodata) = .; \ 422 } \ 423 . = ALIGN((align)); 424 425 /* RODATA & RO_DATA provided for backward compatibility. 426 * All archs are supposed to use RO_DATA() */ 427 #define RODATA RO_DATA_SECTION(4096) 428 #define RO_DATA(align) RO_DATA_SECTION(align) 429 430 #define SECURITY_INIT \ 431 .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \ 432 VMLINUX_SYMBOL(__security_initcall_start) = .; \ 433 KEEP(*(.security_initcall.init)) \ 434 VMLINUX_SYMBOL(__security_initcall_end) = .; \ 435 } 436 437 /* .text section. Map to function alignment to avoid address changes 438 * during second ld run in second ld pass when generating System.map 439 * LD_DEAD_CODE_DATA_ELIMINATION option enables -ffunction-sections generates 440 * .text.identifier which needs to be pulled in with .text , but some 441 * architectures define .text.foo which is not intended to be pulled in here. 442 * Those enabling LD_DEAD_CODE_DATA_ELIMINATION must ensure they don't have 443 * conflicting section names, and must pull in .text.[0-9a-zA-Z_]* */ 444 #define TEXT_TEXT \ 445 ALIGN_FUNCTION(); \ 446 *(.text.hot .text .text.fixup .text.unlikely) \ 447 *(.ref.text) \ 448 MEM_KEEP(init.text) \ 449 MEM_KEEP(exit.text) \ 450 451 452 /* sched.text is aling to function alignment to secure we have same 453 * address even at second ld pass when generating System.map */ 454 #define SCHED_TEXT \ 455 ALIGN_FUNCTION(); \ 456 VMLINUX_SYMBOL(__sched_text_start) = .; \ 457 *(.sched.text) \ 458 VMLINUX_SYMBOL(__sched_text_end) = .; 459 460 /* spinlock.text is aling to function alignment to secure we have same 461 * address even at second ld pass when generating System.map */ 462 #define LOCK_TEXT \ 463 ALIGN_FUNCTION(); \ 464 VMLINUX_SYMBOL(__lock_text_start) = .; \ 465 *(.spinlock.text) \ 466 VMLINUX_SYMBOL(__lock_text_end) = .; 467 468 #define CPUIDLE_TEXT \ 469 ALIGN_FUNCTION(); \ 470 VMLINUX_SYMBOL(__cpuidle_text_start) = .; \ 471 *(.cpuidle.text) \ 472 VMLINUX_SYMBOL(__cpuidle_text_end) = .; 473 474 #define KPROBES_TEXT \ 475 ALIGN_FUNCTION(); \ 476 VMLINUX_SYMBOL(__kprobes_text_start) = .; \ 477 *(.kprobes.text) \ 478 VMLINUX_SYMBOL(__kprobes_text_end) = .; 479 480 #define ENTRY_TEXT \ 481 ALIGN_FUNCTION(); \ 482 VMLINUX_SYMBOL(__entry_text_start) = .; \ 483 *(.entry.text) \ 484 VMLINUX_SYMBOL(__entry_text_end) = .; 485 486 #define IRQENTRY_TEXT \ 487 ALIGN_FUNCTION(); \ 488 VMLINUX_SYMBOL(__irqentry_text_start) = .; \ 489 *(.irqentry.text) \ 490 VMLINUX_SYMBOL(__irqentry_text_end) = .; 491 492 #define SOFTIRQENTRY_TEXT \ 493 ALIGN_FUNCTION(); \ 494 VMLINUX_SYMBOL(__softirqentry_text_start) = .; \ 495 *(.softirqentry.text) \ 496 VMLINUX_SYMBOL(__softirqentry_text_end) = .; 497 498 /* Section used for early init (in .S files) */ 499 #define HEAD_TEXT *(.head.text) 500 501 #define HEAD_TEXT_SECTION \ 502 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 503 HEAD_TEXT \ 504 } 505 506 /* 507 * Exception table 508 */ 509 #define EXCEPTION_TABLE(align) \ 510 . = ALIGN(align); \ 511 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 512 VMLINUX_SYMBOL(__start___ex_table) = .; \ 513 KEEP(*(__ex_table)) \ 514 VMLINUX_SYMBOL(__stop___ex_table) = .; \ 515 } 516 517 /* 518 * Init task 519 */ 520 #define INIT_TASK_DATA_SECTION(align) \ 521 . = ALIGN(align); \ 522 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 523 INIT_TASK_DATA(align) \ 524 } 525 526 #ifdef CONFIG_CONSTRUCTORS 527 #define KERNEL_CTORS() . = ALIGN(8); \ 528 VMLINUX_SYMBOL(__ctors_start) = .; \ 529 KEEP(*(.ctors)) \ 530 KEEP(*(SORT(.init_array.*))) \ 531 KEEP(*(.init_array)) \ 532 VMLINUX_SYMBOL(__ctors_end) = .; 533 #else 534 #define KERNEL_CTORS() 535 #endif 536 537 /* init and exit section handling */ 538 #define INIT_DATA \ 539 KEEP(*(SORT(___kentry+*))) \ 540 *(.init.data) \ 541 MEM_DISCARD(init.data) \ 542 KERNEL_CTORS() \ 543 MCOUNT_REC() \ 544 *(.init.rodata) \ 545 FTRACE_EVENTS() \ 546 TRACE_SYSCALLS() \ 547 KPROBE_BLACKLIST() \ 548 MEM_DISCARD(init.rodata) \ 549 CLK_OF_TABLES() \ 550 RESERVEDMEM_OF_TABLES() \ 551 TIMER_OF_TABLES() \ 552 IOMMU_OF_TABLES() \ 553 CPU_METHOD_OF_TABLES() \ 554 CPUIDLE_METHOD_OF_TABLES() \ 555 KERNEL_DTB() \ 556 IRQCHIP_OF_MATCH_TABLE() \ 557 ACPI_PROBE_TABLE(irqchip) \ 558 ACPI_PROBE_TABLE(timer) \ 559 ACPI_PROBE_TABLE(iort) \ 560 EARLYCON_TABLE() 561 562 #define INIT_TEXT \ 563 *(.init.text) \ 564 *(.text.startup) \ 565 MEM_DISCARD(init.text) 566 567 #define EXIT_DATA \ 568 *(.exit.data) \ 569 *(.fini_array) \ 570 *(.dtors) \ 571 MEM_DISCARD(exit.data) \ 572 MEM_DISCARD(exit.rodata) 573 574 #define EXIT_TEXT \ 575 *(.exit.text) \ 576 *(.text.exit) \ 577 MEM_DISCARD(exit.text) 578 579 #define EXIT_CALL \ 580 *(.exitcall.exit) 581 582 /* 583 * bss (Block Started by Symbol) - uninitialized data 584 * zeroed during startup 585 */ 586 #define SBSS(sbss_align) \ 587 . = ALIGN(sbss_align); \ 588 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 589 *(.dynsbss) \ 590 *(.sbss) \ 591 *(.scommon) \ 592 } 593 594 /* 595 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 596 * sections to the front of bss. 597 */ 598 #ifndef BSS_FIRST_SECTIONS 599 #define BSS_FIRST_SECTIONS 600 #endif 601 602 #define BSS(bss_align) \ 603 . = ALIGN(bss_align); \ 604 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 605 BSS_FIRST_SECTIONS \ 606 *(.bss..page_aligned) \ 607 *(.dynbss) \ 608 *(.bss .bss.[0-9a-zA-Z_]*) \ 609 *(COMMON) \ 610 } 611 612 /* 613 * DWARF debug sections. 614 * Symbols in the DWARF debugging sections are relative to 615 * the beginning of the section so we begin them at 0. 616 */ 617 #define DWARF_DEBUG \ 618 /* DWARF 1 */ \ 619 .debug 0 : { *(.debug) } \ 620 .line 0 : { *(.line) } \ 621 /* GNU DWARF 1 extensions */ \ 622 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 623 .debug_sfnames 0 : { *(.debug_sfnames) } \ 624 /* DWARF 1.1 and DWARF 2 */ \ 625 .debug_aranges 0 : { *(.debug_aranges) } \ 626 .debug_pubnames 0 : { *(.debug_pubnames) } \ 627 /* DWARF 2 */ \ 628 .debug_info 0 : { *(.debug_info \ 629 .gnu.linkonce.wi.*) } \ 630 .debug_abbrev 0 : { *(.debug_abbrev) } \ 631 .debug_line 0 : { *(.debug_line) } \ 632 .debug_frame 0 : { *(.debug_frame) } \ 633 .debug_str 0 : { *(.debug_str) } \ 634 .debug_loc 0 : { *(.debug_loc) } \ 635 .debug_macinfo 0 : { *(.debug_macinfo) } \ 636 .debug_pubtypes 0 : { *(.debug_pubtypes) } \ 637 /* DWARF 3 */ \ 638 .debug_ranges 0 : { *(.debug_ranges) } \ 639 /* SGI/MIPS DWARF 2 extensions */ \ 640 .debug_weaknames 0 : { *(.debug_weaknames) } \ 641 .debug_funcnames 0 : { *(.debug_funcnames) } \ 642 .debug_typenames 0 : { *(.debug_typenames) } \ 643 .debug_varnames 0 : { *(.debug_varnames) } \ 644 /* GNU DWARF 2 extensions */ \ 645 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \ 646 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \ 647 /* DWARF 4 */ \ 648 .debug_types 0 : { *(.debug_types) } \ 649 /* DWARF 5 */ \ 650 .debug_macro 0 : { *(.debug_macro) } \ 651 .debug_addr 0 : { *(.debug_addr) } 652 653 /* Stabs debugging sections. */ 654 #define STABS_DEBUG \ 655 .stab 0 : { *(.stab) } \ 656 .stabstr 0 : { *(.stabstr) } \ 657 .stab.excl 0 : { *(.stab.excl) } \ 658 .stab.exclstr 0 : { *(.stab.exclstr) } \ 659 .stab.index 0 : { *(.stab.index) } \ 660 .stab.indexstr 0 : { *(.stab.indexstr) } \ 661 .comment 0 : { *(.comment) } 662 663 #ifdef CONFIG_GENERIC_BUG 664 #define BUG_TABLE \ 665 . = ALIGN(8); \ 666 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 667 VMLINUX_SYMBOL(__start___bug_table) = .; \ 668 KEEP(*(__bug_table)) \ 669 VMLINUX_SYMBOL(__stop___bug_table) = .; \ 670 } 671 #else 672 #define BUG_TABLE 673 #endif 674 675 #ifdef CONFIG_PM_TRACE 676 #define TRACEDATA \ 677 . = ALIGN(4); \ 678 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 679 VMLINUX_SYMBOL(__tracedata_start) = .; \ 680 KEEP(*(.tracedata)) \ 681 VMLINUX_SYMBOL(__tracedata_end) = .; \ 682 } 683 #else 684 #define TRACEDATA 685 #endif 686 687 #define NOTES \ 688 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 689 VMLINUX_SYMBOL(__start_notes) = .; \ 690 *(.note.*) \ 691 VMLINUX_SYMBOL(__stop_notes) = .; \ 692 } 693 694 #define INIT_SETUP(initsetup_align) \ 695 . = ALIGN(initsetup_align); \ 696 VMLINUX_SYMBOL(__setup_start) = .; \ 697 KEEP(*(.init.setup)) \ 698 VMLINUX_SYMBOL(__setup_end) = .; 699 700 #define INIT_CALLS_LEVEL(level) \ 701 VMLINUX_SYMBOL(__initcall##level##_start) = .; \ 702 KEEP(*(.initcall##level##.init)) \ 703 KEEP(*(.initcall##level##s.init)) \ 704 705 #define INIT_CALLS \ 706 VMLINUX_SYMBOL(__initcall_start) = .; \ 707 KEEP(*(.initcallearly.init)) \ 708 INIT_CALLS_LEVEL(0) \ 709 INIT_CALLS_LEVEL(1) \ 710 INIT_CALLS_LEVEL(2) \ 711 INIT_CALLS_LEVEL(3) \ 712 INIT_CALLS_LEVEL(4) \ 713 INIT_CALLS_LEVEL(5) \ 714 INIT_CALLS_LEVEL(rootfs) \ 715 INIT_CALLS_LEVEL(6) \ 716 INIT_CALLS_LEVEL(7) \ 717 VMLINUX_SYMBOL(__initcall_end) = .; 718 719 #define CON_INITCALL \ 720 VMLINUX_SYMBOL(__con_initcall_start) = .; \ 721 KEEP(*(.con_initcall.init)) \ 722 VMLINUX_SYMBOL(__con_initcall_end) = .; 723 724 #define SECURITY_INITCALL \ 725 VMLINUX_SYMBOL(__security_initcall_start) = .; \ 726 KEEP(*(.security_initcall.init)) \ 727 VMLINUX_SYMBOL(__security_initcall_end) = .; 728 729 #ifdef CONFIG_BLK_DEV_INITRD 730 #define INIT_RAM_FS \ 731 . = ALIGN(4); \ 732 VMLINUX_SYMBOL(__initramfs_start) = .; \ 733 KEEP(*(.init.ramfs)) \ 734 . = ALIGN(8); \ 735 KEEP(*(.init.ramfs.info)) 736 #else 737 #define INIT_RAM_FS 738 #endif 739 740 /* 741 * Default discarded sections. 742 * 743 * Some archs want to discard exit text/data at runtime rather than 744 * link time due to cross-section references such as alt instructions, 745 * bug table, eh_frame, etc. DISCARDS must be the last of output 746 * section definitions so that such archs put those in earlier section 747 * definitions. 748 */ 749 #define DISCARDS \ 750 /DISCARD/ : { \ 751 EXIT_TEXT \ 752 EXIT_DATA \ 753 EXIT_CALL \ 754 *(.discard) \ 755 *(.discard.*) \ 756 } 757 758 /** 759 * PERCPU_INPUT - the percpu input sections 760 * @cacheline: cacheline size 761 * 762 * The core percpu section names and core symbols which do not rely 763 * directly upon load addresses. 764 * 765 * @cacheline is used to align subsections to avoid false cacheline 766 * sharing between subsections for different purposes. 767 */ 768 #define PERCPU_INPUT(cacheline) \ 769 VMLINUX_SYMBOL(__per_cpu_start) = .; \ 770 *(.data..percpu..first) \ 771 . = ALIGN(PAGE_SIZE); \ 772 *(.data..percpu..page_aligned) \ 773 . = ALIGN(cacheline); \ 774 *(.data..percpu..read_mostly) \ 775 . = ALIGN(cacheline); \ 776 *(.data..percpu) \ 777 *(.data..percpu..shared_aligned) \ 778 VMLINUX_SYMBOL(__per_cpu_end) = .; 779 780 /** 781 * PERCPU_VADDR - define output section for percpu area 782 * @cacheline: cacheline size 783 * @vaddr: explicit base address (optional) 784 * @phdr: destination PHDR (optional) 785 * 786 * Macro which expands to output section for percpu area. 787 * 788 * @cacheline is used to align subsections to avoid false cacheline 789 * sharing between subsections for different purposes. 790 * 791 * If @vaddr is not blank, it specifies explicit base address and all 792 * percpu symbols will be offset from the given address. If blank, 793 * @vaddr always equals @laddr + LOAD_OFFSET. 794 * 795 * @phdr defines the output PHDR to use if not blank. Be warned that 796 * output PHDR is sticky. If @phdr is specified, the next output 797 * section in the linker script will go there too. @phdr should have 798 * a leading colon. 799 * 800 * Note that this macros defines __per_cpu_load as an absolute symbol. 801 * If there is no need to put the percpu section at a predetermined 802 * address, use PERCPU_SECTION. 803 */ 804 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 805 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 806 .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load) \ 807 - LOAD_OFFSET) { \ 808 PERCPU_INPUT(cacheline) \ 809 } phdr \ 810 . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu); 811 812 /** 813 * PERCPU_SECTION - define output section for percpu area, simple version 814 * @cacheline: cacheline size 815 * 816 * Align to PAGE_SIZE and outputs output section for percpu area. This 817 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 818 * __per_cpu_start will be identical. 819 * 820 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 821 * except that __per_cpu_load is defined as a relative symbol against 822 * .data..percpu which is required for relocatable x86_32 configuration. 823 */ 824 #define PERCPU_SECTION(cacheline) \ 825 . = ALIGN(PAGE_SIZE); \ 826 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 827 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 828 PERCPU_INPUT(cacheline) \ 829 } 830 831 832 /* 833 * Definition of the high level *_SECTION macros 834 * They will fit only a subset of the architectures 835 */ 836 837 838 /* 839 * Writeable data. 840 * All sections are combined in a single .data section. 841 * The sections following CONSTRUCTORS are arranged so their 842 * typical alignment matches. 843 * A cacheline is typical/always less than a PAGE_SIZE so 844 * the sections that has this restriction (or similar) 845 * is located before the ones requiring PAGE_SIZE alignment. 846 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 847 * matches the requirement of PAGE_ALIGNED_DATA. 848 * 849 * use 0 as page_align if page_aligned data is not used */ 850 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \ 851 . = ALIGN(PAGE_SIZE); \ 852 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 853 INIT_TASK_DATA(inittask) \ 854 NOSAVE_DATA \ 855 PAGE_ALIGNED_DATA(pagealigned) \ 856 CACHELINE_ALIGNED_DATA(cacheline) \ 857 READ_MOSTLY_DATA(cacheline) \ 858 DATA_DATA \ 859 CONSTRUCTORS \ 860 } \ 861 BUG_TABLE 862 863 #define INIT_TEXT_SECTION(inittext_align) \ 864 . = ALIGN(inittext_align); \ 865 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 866 VMLINUX_SYMBOL(_sinittext) = .; \ 867 INIT_TEXT \ 868 VMLINUX_SYMBOL(_einittext) = .; \ 869 } 870 871 #define INIT_DATA_SECTION(initsetup_align) \ 872 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 873 INIT_DATA \ 874 INIT_SETUP(initsetup_align) \ 875 INIT_CALLS \ 876 CON_INITCALL \ 877 SECURITY_INITCALL \ 878 INIT_RAM_FS \ 879 } 880 881 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 882 . = ALIGN(sbss_align); \ 883 VMLINUX_SYMBOL(__bss_start) = .; \ 884 SBSS(sbss_align) \ 885 BSS(bss_align) \ 886 . = ALIGN(stop_align); \ 887 VMLINUX_SYMBOL(__bss_stop) = .; 888