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_enum_maps) = .; \ 129 KEEP(*(_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 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 #if defined(CONFIG_FUNCTION_GRAPH_TRACER) || defined(CONFIG_KASAN) 487 #define IRQENTRY_TEXT \ 488 ALIGN_FUNCTION(); \ 489 VMLINUX_SYMBOL(__irqentry_text_start) = .; \ 490 *(.irqentry.text) \ 491 VMLINUX_SYMBOL(__irqentry_text_end) = .; 492 #else 493 #define IRQENTRY_TEXT 494 #endif 495 496 #if defined(CONFIG_FUNCTION_GRAPH_TRACER) || defined(CONFIG_KASAN) 497 #define SOFTIRQENTRY_TEXT \ 498 ALIGN_FUNCTION(); \ 499 VMLINUX_SYMBOL(__softirqentry_text_start) = .; \ 500 *(.softirqentry.text) \ 501 VMLINUX_SYMBOL(__softirqentry_text_end) = .; 502 #else 503 #define SOFTIRQENTRY_TEXT 504 #endif 505 506 /* Section used for early init (in .S files) */ 507 #define HEAD_TEXT *(.head.text) 508 509 #define HEAD_TEXT_SECTION \ 510 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 511 HEAD_TEXT \ 512 } 513 514 /* 515 * Exception table 516 */ 517 #define EXCEPTION_TABLE(align) \ 518 . = ALIGN(align); \ 519 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 520 VMLINUX_SYMBOL(__start___ex_table) = .; \ 521 KEEP(*(__ex_table)) \ 522 VMLINUX_SYMBOL(__stop___ex_table) = .; \ 523 } 524 525 /* 526 * Init task 527 */ 528 #define INIT_TASK_DATA_SECTION(align) \ 529 . = ALIGN(align); \ 530 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 531 INIT_TASK_DATA(align) \ 532 } 533 534 #ifdef CONFIG_CONSTRUCTORS 535 #define KERNEL_CTORS() . = ALIGN(8); \ 536 VMLINUX_SYMBOL(__ctors_start) = .; \ 537 KEEP(*(.ctors)) \ 538 KEEP(*(SORT(.init_array.*))) \ 539 KEEP(*(.init_array)) \ 540 VMLINUX_SYMBOL(__ctors_end) = .; 541 #else 542 #define KERNEL_CTORS() 543 #endif 544 545 /* init and exit section handling */ 546 #define INIT_DATA \ 547 KEEP(*(SORT(___kentry+*))) \ 548 *(.init.data) \ 549 MEM_DISCARD(init.data) \ 550 KERNEL_CTORS() \ 551 MCOUNT_REC() \ 552 *(.init.rodata) \ 553 FTRACE_EVENTS() \ 554 TRACE_SYSCALLS() \ 555 KPROBE_BLACKLIST() \ 556 MEM_DISCARD(init.rodata) \ 557 CLK_OF_TABLES() \ 558 RESERVEDMEM_OF_TABLES() \ 559 TIMER_OF_TABLES() \ 560 IOMMU_OF_TABLES() \ 561 CPU_METHOD_OF_TABLES() \ 562 CPUIDLE_METHOD_OF_TABLES() \ 563 KERNEL_DTB() \ 564 IRQCHIP_OF_MATCH_TABLE() \ 565 ACPI_PROBE_TABLE(irqchip) \ 566 ACPI_PROBE_TABLE(timer) \ 567 ACPI_PROBE_TABLE(iort) \ 568 EARLYCON_TABLE() 569 570 #define INIT_TEXT \ 571 *(.init.text) \ 572 *(.text.startup) \ 573 MEM_DISCARD(init.text) 574 575 #define EXIT_DATA \ 576 *(.exit.data) \ 577 *(.fini_array) \ 578 *(.dtors) \ 579 MEM_DISCARD(exit.data) \ 580 MEM_DISCARD(exit.rodata) 581 582 #define EXIT_TEXT \ 583 *(.exit.text) \ 584 *(.text.exit) \ 585 MEM_DISCARD(exit.text) 586 587 #define EXIT_CALL \ 588 *(.exitcall.exit) 589 590 /* 591 * bss (Block Started by Symbol) - uninitialized data 592 * zeroed during startup 593 */ 594 #define SBSS(sbss_align) \ 595 . = ALIGN(sbss_align); \ 596 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 597 *(.sbss) \ 598 *(.scommon) \ 599 } 600 601 /* 602 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 603 * sections to the front of bss. 604 */ 605 #ifndef BSS_FIRST_SECTIONS 606 #define BSS_FIRST_SECTIONS 607 #endif 608 609 #define BSS(bss_align) \ 610 . = ALIGN(bss_align); \ 611 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 612 BSS_FIRST_SECTIONS \ 613 *(.bss..page_aligned) \ 614 *(.dynbss) \ 615 *(.bss .bss.[0-9a-zA-Z_]*) \ 616 *(COMMON) \ 617 } 618 619 /* 620 * DWARF debug sections. 621 * Symbols in the DWARF debugging sections are relative to 622 * the beginning of the section so we begin them at 0. 623 */ 624 #define DWARF_DEBUG \ 625 /* DWARF 1 */ \ 626 .debug 0 : { *(.debug) } \ 627 .line 0 : { *(.line) } \ 628 /* GNU DWARF 1 extensions */ \ 629 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 630 .debug_sfnames 0 : { *(.debug_sfnames) } \ 631 /* DWARF 1.1 and DWARF 2 */ \ 632 .debug_aranges 0 : { *(.debug_aranges) } \ 633 .debug_pubnames 0 : { *(.debug_pubnames) } \ 634 /* DWARF 2 */ \ 635 .debug_info 0 : { *(.debug_info \ 636 .gnu.linkonce.wi.*) } \ 637 .debug_abbrev 0 : { *(.debug_abbrev) } \ 638 .debug_line 0 : { *(.debug_line) } \ 639 .debug_frame 0 : { *(.debug_frame) } \ 640 .debug_str 0 : { *(.debug_str) } \ 641 .debug_loc 0 : { *(.debug_loc) } \ 642 .debug_macinfo 0 : { *(.debug_macinfo) } \ 643 /* SGI/MIPS DWARF 2 extensions */ \ 644 .debug_weaknames 0 : { *(.debug_weaknames) } \ 645 .debug_funcnames 0 : { *(.debug_funcnames) } \ 646 .debug_typenames 0 : { *(.debug_typenames) } \ 647 .debug_varnames 0 : { *(.debug_varnames) } \ 648 649 /* Stabs debugging sections. */ 650 #define STABS_DEBUG \ 651 .stab 0 : { *(.stab) } \ 652 .stabstr 0 : { *(.stabstr) } \ 653 .stab.excl 0 : { *(.stab.excl) } \ 654 .stab.exclstr 0 : { *(.stab.exclstr) } \ 655 .stab.index 0 : { *(.stab.index) } \ 656 .stab.indexstr 0 : { *(.stab.indexstr) } \ 657 .comment 0 : { *(.comment) } 658 659 #ifdef CONFIG_GENERIC_BUG 660 #define BUG_TABLE \ 661 . = ALIGN(8); \ 662 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 663 VMLINUX_SYMBOL(__start___bug_table) = .; \ 664 KEEP(*(__bug_table)) \ 665 VMLINUX_SYMBOL(__stop___bug_table) = .; \ 666 } 667 #else 668 #define BUG_TABLE 669 #endif 670 671 #ifdef CONFIG_PM_TRACE 672 #define TRACEDATA \ 673 . = ALIGN(4); \ 674 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 675 VMLINUX_SYMBOL(__tracedata_start) = .; \ 676 KEEP(*(.tracedata)) \ 677 VMLINUX_SYMBOL(__tracedata_end) = .; \ 678 } 679 #else 680 #define TRACEDATA 681 #endif 682 683 #define NOTES \ 684 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 685 VMLINUX_SYMBOL(__start_notes) = .; \ 686 *(.note.*) \ 687 VMLINUX_SYMBOL(__stop_notes) = .; \ 688 } 689 690 #define INIT_SETUP(initsetup_align) \ 691 . = ALIGN(initsetup_align); \ 692 VMLINUX_SYMBOL(__setup_start) = .; \ 693 KEEP(*(.init.setup)) \ 694 VMLINUX_SYMBOL(__setup_end) = .; 695 696 #define INIT_CALLS_LEVEL(level) \ 697 VMLINUX_SYMBOL(__initcall##level##_start) = .; \ 698 KEEP(*(.initcall##level##.init)) \ 699 KEEP(*(.initcall##level##s.init)) \ 700 701 #define INIT_CALLS \ 702 VMLINUX_SYMBOL(__initcall_start) = .; \ 703 KEEP(*(.initcallearly.init)) \ 704 INIT_CALLS_LEVEL(0) \ 705 INIT_CALLS_LEVEL(1) \ 706 INIT_CALLS_LEVEL(2) \ 707 INIT_CALLS_LEVEL(3) \ 708 INIT_CALLS_LEVEL(4) \ 709 INIT_CALLS_LEVEL(5) \ 710 INIT_CALLS_LEVEL(rootfs) \ 711 INIT_CALLS_LEVEL(6) \ 712 INIT_CALLS_LEVEL(7) \ 713 VMLINUX_SYMBOL(__initcall_end) = .; 714 715 #define CON_INITCALL \ 716 VMLINUX_SYMBOL(__con_initcall_start) = .; \ 717 KEEP(*(.con_initcall.init)) \ 718 VMLINUX_SYMBOL(__con_initcall_end) = .; 719 720 #define SECURITY_INITCALL \ 721 VMLINUX_SYMBOL(__security_initcall_start) = .; \ 722 KEEP(*(.security_initcall.init)) \ 723 VMLINUX_SYMBOL(__security_initcall_end) = .; 724 725 #ifdef CONFIG_BLK_DEV_INITRD 726 #define INIT_RAM_FS \ 727 . = ALIGN(4); \ 728 VMLINUX_SYMBOL(__initramfs_start) = .; \ 729 KEEP(*(.init.ramfs)) \ 730 . = ALIGN(8); \ 731 KEEP(*(.init.ramfs.info)) 732 #else 733 #define INIT_RAM_FS 734 #endif 735 736 /* 737 * Default discarded sections. 738 * 739 * Some archs want to discard exit text/data at runtime rather than 740 * link time due to cross-section references such as alt instructions, 741 * bug table, eh_frame, etc. DISCARDS must be the last of output 742 * section definitions so that such archs put those in earlier section 743 * definitions. 744 */ 745 #define DISCARDS \ 746 /DISCARD/ : { \ 747 EXIT_TEXT \ 748 EXIT_DATA \ 749 EXIT_CALL \ 750 *(.discard) \ 751 *(.discard.*) \ 752 } 753 754 /** 755 * PERCPU_INPUT - the percpu input sections 756 * @cacheline: cacheline size 757 * 758 * The core percpu section names and core symbols which do not rely 759 * directly upon load addresses. 760 * 761 * @cacheline is used to align subsections to avoid false cacheline 762 * sharing between subsections for different purposes. 763 */ 764 #define PERCPU_INPUT(cacheline) \ 765 VMLINUX_SYMBOL(__per_cpu_start) = .; \ 766 *(.data..percpu..first) \ 767 . = ALIGN(PAGE_SIZE); \ 768 *(.data..percpu..page_aligned) \ 769 . = ALIGN(cacheline); \ 770 *(.data..percpu..read_mostly) \ 771 . = ALIGN(cacheline); \ 772 *(.data..percpu) \ 773 *(.data..percpu..shared_aligned) \ 774 VMLINUX_SYMBOL(__per_cpu_end) = .; 775 776 /** 777 * PERCPU_VADDR - define output section for percpu area 778 * @cacheline: cacheline size 779 * @vaddr: explicit base address (optional) 780 * @phdr: destination PHDR (optional) 781 * 782 * Macro which expands to output section for percpu area. 783 * 784 * @cacheline is used to align subsections to avoid false cacheline 785 * sharing between subsections for different purposes. 786 * 787 * If @vaddr is not blank, it specifies explicit base address and all 788 * percpu symbols will be offset from the given address. If blank, 789 * @vaddr always equals @laddr + LOAD_OFFSET. 790 * 791 * @phdr defines the output PHDR to use if not blank. Be warned that 792 * output PHDR is sticky. If @phdr is specified, the next output 793 * section in the linker script will go there too. @phdr should have 794 * a leading colon. 795 * 796 * Note that this macros defines __per_cpu_load as an absolute symbol. 797 * If there is no need to put the percpu section at a predetermined 798 * address, use PERCPU_SECTION. 799 */ 800 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 801 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 802 .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load) \ 803 - LOAD_OFFSET) { \ 804 PERCPU_INPUT(cacheline) \ 805 } phdr \ 806 . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu); 807 808 /** 809 * PERCPU_SECTION - define output section for percpu area, simple version 810 * @cacheline: cacheline size 811 * 812 * Align to PAGE_SIZE and outputs output section for percpu area. This 813 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 814 * __per_cpu_start will be identical. 815 * 816 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 817 * except that __per_cpu_load is defined as a relative symbol against 818 * .data..percpu which is required for relocatable x86_32 configuration. 819 */ 820 #define PERCPU_SECTION(cacheline) \ 821 . = ALIGN(PAGE_SIZE); \ 822 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 823 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 824 PERCPU_INPUT(cacheline) \ 825 } 826 827 828 /* 829 * Definition of the high level *_SECTION macros 830 * They will fit only a subset of the architectures 831 */ 832 833 834 /* 835 * Writeable data. 836 * All sections are combined in a single .data section. 837 * The sections following CONSTRUCTORS are arranged so their 838 * typical alignment matches. 839 * A cacheline is typical/always less than a PAGE_SIZE so 840 * the sections that has this restriction (or similar) 841 * is located before the ones requiring PAGE_SIZE alignment. 842 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 843 * matches the requirement of PAGE_ALIGNED_DATA. 844 * 845 * use 0 as page_align if page_aligned data is not used */ 846 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \ 847 . = ALIGN(PAGE_SIZE); \ 848 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 849 INIT_TASK_DATA(inittask) \ 850 NOSAVE_DATA \ 851 PAGE_ALIGNED_DATA(pagealigned) \ 852 CACHELINE_ALIGNED_DATA(cacheline) \ 853 READ_MOSTLY_DATA(cacheline) \ 854 DATA_DATA \ 855 CONSTRUCTORS \ 856 } \ 857 BUG_TABLE 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