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 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 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 __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 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 BUG_TABLE \ 290 \ 291 /* PCI quirks */ \ 292 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 293 VMLINUX_SYMBOL(__start_pci_fixups_early) = .; \ 294 KEEP(*(.pci_fixup_early)) \ 295 VMLINUX_SYMBOL(__end_pci_fixups_early) = .; \ 296 VMLINUX_SYMBOL(__start_pci_fixups_header) = .; \ 297 KEEP(*(.pci_fixup_header)) \ 298 VMLINUX_SYMBOL(__end_pci_fixups_header) = .; \ 299 VMLINUX_SYMBOL(__start_pci_fixups_final) = .; \ 300 KEEP(*(.pci_fixup_final)) \ 301 VMLINUX_SYMBOL(__end_pci_fixups_final) = .; \ 302 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .; \ 303 KEEP(*(.pci_fixup_enable)) \ 304 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .; \ 305 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .; \ 306 KEEP(*(.pci_fixup_resume)) \ 307 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .; \ 308 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .; \ 309 KEEP(*(.pci_fixup_resume_early)) \ 310 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .; \ 311 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .; \ 312 KEEP(*(.pci_fixup_suspend)) \ 313 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .; \ 314 VMLINUX_SYMBOL(__start_pci_fixups_suspend_late) = .; \ 315 KEEP(*(.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 KEEP(*(.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 *(__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 KEEP(*(__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 KEEP(*(__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 KEEP(*(__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 KEEP(*(.ctors)) \ 540 KEEP(*(SORT(.init_array.*))) \ 541 KEEP(*(.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 ACPI_PROBE_TABLE(iort) \ 570 EARLYCON_TABLE() 571 572 #define INIT_TEXT \ 573 *(.init.text) \ 574 *(.text.startup) \ 575 MEM_DISCARD(init.text) 576 577 #define EXIT_DATA \ 578 *(.exit.data) \ 579 *(.fini_array) \ 580 *(.dtors) \ 581 MEM_DISCARD(exit.data) \ 582 MEM_DISCARD(exit.rodata) 583 584 #define EXIT_TEXT \ 585 *(.exit.text) \ 586 *(.text.exit) \ 587 MEM_DISCARD(exit.text) 588 589 #define EXIT_CALL \ 590 *(.exitcall.exit) 591 592 /* 593 * bss (Block Started by Symbol) - uninitialized data 594 * zeroed during startup 595 */ 596 #define SBSS(sbss_align) \ 597 . = ALIGN(sbss_align); \ 598 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 599 *(.sbss) \ 600 *(.scommon) \ 601 } 602 603 /* 604 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 605 * sections to the front of bss. 606 */ 607 #ifndef BSS_FIRST_SECTIONS 608 #define BSS_FIRST_SECTIONS 609 #endif 610 611 #define BSS(bss_align) \ 612 . = ALIGN(bss_align); \ 613 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 614 BSS_FIRST_SECTIONS \ 615 *(.bss..page_aligned) \ 616 *(.dynbss) \ 617 *(.bss .bss.[0-9a-zA-Z_]*) \ 618 *(COMMON) \ 619 } 620 621 /* 622 * DWARF debug sections. 623 * Symbols in the DWARF debugging sections are relative to 624 * the beginning of the section so we begin them at 0. 625 */ 626 #define DWARF_DEBUG \ 627 /* DWARF 1 */ \ 628 .debug 0 : { *(.debug) } \ 629 .line 0 : { *(.line) } \ 630 /* GNU DWARF 1 extensions */ \ 631 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 632 .debug_sfnames 0 : { *(.debug_sfnames) } \ 633 /* DWARF 1.1 and DWARF 2 */ \ 634 .debug_aranges 0 : { *(.debug_aranges) } \ 635 .debug_pubnames 0 : { *(.debug_pubnames) } \ 636 /* DWARF 2 */ \ 637 .debug_info 0 : { *(.debug_info \ 638 .gnu.linkonce.wi.*) } \ 639 .debug_abbrev 0 : { *(.debug_abbrev) } \ 640 .debug_line 0 : { *(.debug_line) } \ 641 .debug_frame 0 : { *(.debug_frame) } \ 642 .debug_str 0 : { *(.debug_str) } \ 643 .debug_loc 0 : { *(.debug_loc) } \ 644 .debug_macinfo 0 : { *(.debug_macinfo) } \ 645 /* SGI/MIPS DWARF 2 extensions */ \ 646 .debug_weaknames 0 : { *(.debug_weaknames) } \ 647 .debug_funcnames 0 : { *(.debug_funcnames) } \ 648 .debug_typenames 0 : { *(.debug_typenames) } \ 649 .debug_varnames 0 : { *(.debug_varnames) } \ 650 651 /* Stabs debugging sections. */ 652 #define STABS_DEBUG \ 653 .stab 0 : { *(.stab) } \ 654 .stabstr 0 : { *(.stabstr) } \ 655 .stab.excl 0 : { *(.stab.excl) } \ 656 .stab.exclstr 0 : { *(.stab.exclstr) } \ 657 .stab.index 0 : { *(.stab.index) } \ 658 .stab.indexstr 0 : { *(.stab.indexstr) } \ 659 .comment 0 : { *(.comment) } 660 661 #ifdef CONFIG_GENERIC_BUG 662 #define BUG_TABLE \ 663 . = ALIGN(8); \ 664 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 665 VMLINUX_SYMBOL(__start___bug_table) = .; \ 666 KEEP(*(__bug_table)) \ 667 VMLINUX_SYMBOL(__stop___bug_table) = .; \ 668 } 669 #else 670 #define BUG_TABLE 671 #endif 672 673 #ifdef CONFIG_PM_TRACE 674 #define TRACEDATA \ 675 . = ALIGN(4); \ 676 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 677 VMLINUX_SYMBOL(__tracedata_start) = .; \ 678 KEEP(*(.tracedata)) \ 679 VMLINUX_SYMBOL(__tracedata_end) = .; \ 680 } 681 #else 682 #define TRACEDATA 683 #endif 684 685 #define NOTES \ 686 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 687 VMLINUX_SYMBOL(__start_notes) = .; \ 688 *(.note.*) \ 689 VMLINUX_SYMBOL(__stop_notes) = .; \ 690 } 691 692 #define INIT_SETUP(initsetup_align) \ 693 . = ALIGN(initsetup_align); \ 694 VMLINUX_SYMBOL(__setup_start) = .; \ 695 KEEP(*(.init.setup)) \ 696 VMLINUX_SYMBOL(__setup_end) = .; 697 698 #define INIT_CALLS_LEVEL(level) \ 699 VMLINUX_SYMBOL(__initcall##level##_start) = .; \ 700 KEEP(*(.initcall##level##.init)) \ 701 KEEP(*(.initcall##level##s.init)) \ 702 703 #define INIT_CALLS \ 704 VMLINUX_SYMBOL(__initcall_start) = .; \ 705 KEEP(*(.initcallearly.init)) \ 706 INIT_CALLS_LEVEL(0) \ 707 INIT_CALLS_LEVEL(1) \ 708 INIT_CALLS_LEVEL(2) \ 709 INIT_CALLS_LEVEL(3) \ 710 INIT_CALLS_LEVEL(4) \ 711 INIT_CALLS_LEVEL(5) \ 712 INIT_CALLS_LEVEL(rootfs) \ 713 INIT_CALLS_LEVEL(6) \ 714 INIT_CALLS_LEVEL(7) \ 715 VMLINUX_SYMBOL(__initcall_end) = .; 716 717 #define CON_INITCALL \ 718 VMLINUX_SYMBOL(__con_initcall_start) = .; \ 719 KEEP(*(.con_initcall.init)) \ 720 VMLINUX_SYMBOL(__con_initcall_end) = .; 721 722 #define SECURITY_INITCALL \ 723 VMLINUX_SYMBOL(__security_initcall_start) = .; \ 724 KEEP(*(.security_initcall.init)) \ 725 VMLINUX_SYMBOL(__security_initcall_end) = .; 726 727 #ifdef CONFIG_BLK_DEV_INITRD 728 #define INIT_RAM_FS \ 729 . = ALIGN(4); \ 730 VMLINUX_SYMBOL(__initramfs_start) = .; \ 731 KEEP(*(.init.ramfs)) \ 732 . = ALIGN(8); \ 733 KEEP(*(.init.ramfs.info)) 734 #else 735 #define INIT_RAM_FS 736 #endif 737 738 /* 739 * Default discarded sections. 740 * 741 * Some archs want to discard exit text/data at runtime rather than 742 * link time due to cross-section references such as alt instructions, 743 * bug table, eh_frame, etc. DISCARDS must be the last of output 744 * section definitions so that such archs put those in earlier section 745 * definitions. 746 */ 747 #define DISCARDS \ 748 /DISCARD/ : { \ 749 EXIT_TEXT \ 750 EXIT_DATA \ 751 EXIT_CALL \ 752 *(.discard) \ 753 *(.discard.*) \ 754 } 755 756 /** 757 * PERCPU_INPUT - the percpu input sections 758 * @cacheline: cacheline size 759 * 760 * The core percpu section names and core symbols which do not rely 761 * directly upon load addresses. 762 * 763 * @cacheline is used to align subsections to avoid false cacheline 764 * sharing between subsections for different purposes. 765 */ 766 #define PERCPU_INPUT(cacheline) \ 767 VMLINUX_SYMBOL(__per_cpu_start) = .; \ 768 *(.data..percpu..first) \ 769 . = ALIGN(PAGE_SIZE); \ 770 *(.data..percpu..page_aligned) \ 771 . = ALIGN(cacheline); \ 772 *(.data..percpu..read_mostly) \ 773 . = ALIGN(cacheline); \ 774 *(.data..percpu) \ 775 *(.data..percpu..shared_aligned) \ 776 VMLINUX_SYMBOL(__per_cpu_end) = .; 777 778 /** 779 * PERCPU_VADDR - define output section for percpu area 780 * @cacheline: cacheline size 781 * @vaddr: explicit base address (optional) 782 * @phdr: destination PHDR (optional) 783 * 784 * Macro which expands to output section for percpu area. 785 * 786 * @cacheline is used to align subsections to avoid false cacheline 787 * sharing between subsections for different purposes. 788 * 789 * If @vaddr is not blank, it specifies explicit base address and all 790 * percpu symbols will be offset from the given address. If blank, 791 * @vaddr always equals @laddr + LOAD_OFFSET. 792 * 793 * @phdr defines the output PHDR to use if not blank. Be warned that 794 * output PHDR is sticky. If @phdr is specified, the next output 795 * section in the linker script will go there too. @phdr should have 796 * a leading colon. 797 * 798 * Note that this macros defines __per_cpu_load as an absolute symbol. 799 * If there is no need to put the percpu section at a predetermined 800 * address, use PERCPU_SECTION. 801 */ 802 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 803 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 804 .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load) \ 805 - LOAD_OFFSET) { \ 806 PERCPU_INPUT(cacheline) \ 807 } phdr \ 808 . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu); 809 810 /** 811 * PERCPU_SECTION - define output section for percpu area, simple version 812 * @cacheline: cacheline size 813 * 814 * Align to PAGE_SIZE and outputs output section for percpu area. This 815 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 816 * __per_cpu_start will be identical. 817 * 818 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 819 * except that __per_cpu_load is defined as a relative symbol against 820 * .data..percpu which is required for relocatable x86_32 configuration. 821 */ 822 #define PERCPU_SECTION(cacheline) \ 823 . = ALIGN(PAGE_SIZE); \ 824 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 825 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 826 PERCPU_INPUT(cacheline) \ 827 } 828 829 830 /* 831 * Definition of the high level *_SECTION macros 832 * They will fit only a subset of the architectures 833 */ 834 835 836 /* 837 * Writeable data. 838 * All sections are combined in a single .data section. 839 * The sections following CONSTRUCTORS are arranged so their 840 * typical alignment matches. 841 * A cacheline is typical/always less than a PAGE_SIZE so 842 * the sections that has this restriction (or similar) 843 * is located before the ones requiring PAGE_SIZE alignment. 844 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 845 * matches the requirement of PAGE_ALIGNED_DATA. 846 * 847 * use 0 as page_align if page_aligned data is not used */ 848 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \ 849 . = ALIGN(PAGE_SIZE); \ 850 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 851 INIT_TASK_DATA(inittask) \ 852 NOSAVE_DATA \ 853 PAGE_ALIGNED_DATA(pagealigned) \ 854 CACHELINE_ALIGNED_DATA(cacheline) \ 855 READ_MOSTLY_DATA(cacheline) \ 856 DATA_DATA \ 857 CONSTRUCTORS \ 858 } 859 860 #define INIT_TEXT_SECTION(inittext_align) \ 861 . = ALIGN(inittext_align); \ 862 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 863 VMLINUX_SYMBOL(_sinittext) = .; \ 864 INIT_TEXT \ 865 VMLINUX_SYMBOL(_einittext) = .; \ 866 } 867 868 #define INIT_DATA_SECTION(initsetup_align) \ 869 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 870 INIT_DATA \ 871 INIT_SETUP(initsetup_align) \ 872 INIT_CALLS \ 873 CON_INITCALL \ 874 SECURITY_INITCALL \ 875 INIT_RAM_FS \ 876 } 877 878 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 879 . = ALIGN(sbss_align); \ 880 VMLINUX_SYMBOL(__bss_start) = .; \ 881 SBSS(sbss_align) \ 882 BSS(bss_align) \ 883 . = ALIGN(stop_align); \ 884 VMLINUX_SYMBOL(__bss_stop) = .; 885