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 #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 *(.dynsbss) \ 598 *(.sbss) \ 599 *(.scommon) \ 600 } 601 602 /* 603 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 604 * sections to the front of bss. 605 */ 606 #ifndef BSS_FIRST_SECTIONS 607 #define BSS_FIRST_SECTIONS 608 #endif 609 610 #define BSS(bss_align) \ 611 . = ALIGN(bss_align); \ 612 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 613 BSS_FIRST_SECTIONS \ 614 *(.bss..page_aligned) \ 615 *(.dynbss) \ 616 *(.bss .bss.[0-9a-zA-Z_]*) \ 617 *(COMMON) \ 618 } 619 620 /* 621 * DWARF debug sections. 622 * Symbols in the DWARF debugging sections are relative to 623 * the beginning of the section so we begin them at 0. 624 */ 625 #define DWARF_DEBUG \ 626 /* DWARF 1 */ \ 627 .debug 0 : { *(.debug) } \ 628 .line 0 : { *(.line) } \ 629 /* GNU DWARF 1 extensions */ \ 630 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 631 .debug_sfnames 0 : { *(.debug_sfnames) } \ 632 /* DWARF 1.1 and DWARF 2 */ \ 633 .debug_aranges 0 : { *(.debug_aranges) } \ 634 .debug_pubnames 0 : { *(.debug_pubnames) } \ 635 /* DWARF 2 */ \ 636 .debug_info 0 : { *(.debug_info \ 637 .gnu.linkonce.wi.*) } \ 638 .debug_abbrev 0 : { *(.debug_abbrev) } \ 639 .debug_line 0 : { *(.debug_line) } \ 640 .debug_frame 0 : { *(.debug_frame) } \ 641 .debug_str 0 : { *(.debug_str) } \ 642 .debug_loc 0 : { *(.debug_loc) } \ 643 .debug_macinfo 0 : { *(.debug_macinfo) } \ 644 .debug_pubtypes 0 : { *(.debug_pubtypes) } \ 645 /* DWARF 3 */ \ 646 .debug_ranges 0 : { *(.debug_ranges) } \ 647 /* SGI/MIPS DWARF 2 extensions */ \ 648 .debug_weaknames 0 : { *(.debug_weaknames) } \ 649 .debug_funcnames 0 : { *(.debug_funcnames) } \ 650 .debug_typenames 0 : { *(.debug_typenames) } \ 651 .debug_varnames 0 : { *(.debug_varnames) } \ 652 /* GNU DWARF 2 extensions */ \ 653 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \ 654 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \ 655 /* DWARF 4 */ \ 656 .debug_types 0 : { *(.debug_types) } \ 657 /* DWARF 5 */ \ 658 .debug_macro 0 : { *(.debug_macro) } \ 659 .debug_addr 0 : { *(.debug_addr) } 660 661 /* Stabs debugging sections. */ 662 #define STABS_DEBUG \ 663 .stab 0 : { *(.stab) } \ 664 .stabstr 0 : { *(.stabstr) } \ 665 .stab.excl 0 : { *(.stab.excl) } \ 666 .stab.exclstr 0 : { *(.stab.exclstr) } \ 667 .stab.index 0 : { *(.stab.index) } \ 668 .stab.indexstr 0 : { *(.stab.indexstr) } \ 669 .comment 0 : { *(.comment) } 670 671 #ifdef CONFIG_GENERIC_BUG 672 #define BUG_TABLE \ 673 . = ALIGN(8); \ 674 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 675 VMLINUX_SYMBOL(__start___bug_table) = .; \ 676 KEEP(*(__bug_table)) \ 677 VMLINUX_SYMBOL(__stop___bug_table) = .; \ 678 } 679 #else 680 #define BUG_TABLE 681 #endif 682 683 #ifdef CONFIG_PM_TRACE 684 #define TRACEDATA \ 685 . = ALIGN(4); \ 686 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 687 VMLINUX_SYMBOL(__tracedata_start) = .; \ 688 KEEP(*(.tracedata)) \ 689 VMLINUX_SYMBOL(__tracedata_end) = .; \ 690 } 691 #else 692 #define TRACEDATA 693 #endif 694 695 #define NOTES \ 696 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 697 VMLINUX_SYMBOL(__start_notes) = .; \ 698 *(.note.*) \ 699 VMLINUX_SYMBOL(__stop_notes) = .; \ 700 } 701 702 #define INIT_SETUP(initsetup_align) \ 703 . = ALIGN(initsetup_align); \ 704 VMLINUX_SYMBOL(__setup_start) = .; \ 705 KEEP(*(.init.setup)) \ 706 VMLINUX_SYMBOL(__setup_end) = .; 707 708 #define INIT_CALLS_LEVEL(level) \ 709 VMLINUX_SYMBOL(__initcall##level##_start) = .; \ 710 KEEP(*(.initcall##level##.init)) \ 711 KEEP(*(.initcall##level##s.init)) \ 712 713 #define INIT_CALLS \ 714 VMLINUX_SYMBOL(__initcall_start) = .; \ 715 KEEP(*(.initcallearly.init)) \ 716 INIT_CALLS_LEVEL(0) \ 717 INIT_CALLS_LEVEL(1) \ 718 INIT_CALLS_LEVEL(2) \ 719 INIT_CALLS_LEVEL(3) \ 720 INIT_CALLS_LEVEL(4) \ 721 INIT_CALLS_LEVEL(5) \ 722 INIT_CALLS_LEVEL(rootfs) \ 723 INIT_CALLS_LEVEL(6) \ 724 INIT_CALLS_LEVEL(7) \ 725 VMLINUX_SYMBOL(__initcall_end) = .; 726 727 #define CON_INITCALL \ 728 VMLINUX_SYMBOL(__con_initcall_start) = .; \ 729 KEEP(*(.con_initcall.init)) \ 730 VMLINUX_SYMBOL(__con_initcall_end) = .; 731 732 #define SECURITY_INITCALL \ 733 VMLINUX_SYMBOL(__security_initcall_start) = .; \ 734 KEEP(*(.security_initcall.init)) \ 735 VMLINUX_SYMBOL(__security_initcall_end) = .; 736 737 #ifdef CONFIG_BLK_DEV_INITRD 738 #define INIT_RAM_FS \ 739 . = ALIGN(4); \ 740 VMLINUX_SYMBOL(__initramfs_start) = .; \ 741 KEEP(*(.init.ramfs)) \ 742 . = ALIGN(8); \ 743 KEEP(*(.init.ramfs.info)) 744 #else 745 #define INIT_RAM_FS 746 #endif 747 748 /* 749 * Default discarded sections. 750 * 751 * Some archs want to discard exit text/data at runtime rather than 752 * link time due to cross-section references such as alt instructions, 753 * bug table, eh_frame, etc. DISCARDS must be the last of output 754 * section definitions so that such archs put those in earlier section 755 * definitions. 756 */ 757 #define DISCARDS \ 758 /DISCARD/ : { \ 759 EXIT_TEXT \ 760 EXIT_DATA \ 761 EXIT_CALL \ 762 *(.discard) \ 763 *(.discard.*) \ 764 } 765 766 /** 767 * PERCPU_INPUT - the percpu input sections 768 * @cacheline: cacheline size 769 * 770 * The core percpu section names and core symbols which do not rely 771 * directly upon load addresses. 772 * 773 * @cacheline is used to align subsections to avoid false cacheline 774 * sharing between subsections for different purposes. 775 */ 776 #define PERCPU_INPUT(cacheline) \ 777 VMLINUX_SYMBOL(__per_cpu_start) = .; \ 778 *(.data..percpu..first) \ 779 . = ALIGN(PAGE_SIZE); \ 780 *(.data..percpu..page_aligned) \ 781 . = ALIGN(cacheline); \ 782 *(.data..percpu..read_mostly) \ 783 . = ALIGN(cacheline); \ 784 *(.data..percpu) \ 785 *(.data..percpu..shared_aligned) \ 786 VMLINUX_SYMBOL(__per_cpu_end) = .; 787 788 /** 789 * PERCPU_VADDR - define output section for percpu area 790 * @cacheline: cacheline size 791 * @vaddr: explicit base address (optional) 792 * @phdr: destination PHDR (optional) 793 * 794 * Macro which expands to output section for percpu area. 795 * 796 * @cacheline is used to align subsections to avoid false cacheline 797 * sharing between subsections for different purposes. 798 * 799 * If @vaddr is not blank, it specifies explicit base address and all 800 * percpu symbols will be offset from the given address. If blank, 801 * @vaddr always equals @laddr + LOAD_OFFSET. 802 * 803 * @phdr defines the output PHDR to use if not blank. Be warned that 804 * output PHDR is sticky. If @phdr is specified, the next output 805 * section in the linker script will go there too. @phdr should have 806 * a leading colon. 807 * 808 * Note that this macros defines __per_cpu_load as an absolute symbol. 809 * If there is no need to put the percpu section at a predetermined 810 * address, use PERCPU_SECTION. 811 */ 812 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 813 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 814 .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load) \ 815 - LOAD_OFFSET) { \ 816 PERCPU_INPUT(cacheline) \ 817 } phdr \ 818 . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu); 819 820 /** 821 * PERCPU_SECTION - define output section for percpu area, simple version 822 * @cacheline: cacheline size 823 * 824 * Align to PAGE_SIZE and outputs output section for percpu area. This 825 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 826 * __per_cpu_start will be identical. 827 * 828 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 829 * except that __per_cpu_load is defined as a relative symbol against 830 * .data..percpu which is required for relocatable x86_32 configuration. 831 */ 832 #define PERCPU_SECTION(cacheline) \ 833 . = ALIGN(PAGE_SIZE); \ 834 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 835 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 836 PERCPU_INPUT(cacheline) \ 837 } 838 839 840 /* 841 * Definition of the high level *_SECTION macros 842 * They will fit only a subset of the architectures 843 */ 844 845 846 /* 847 * Writeable data. 848 * All sections are combined in a single .data section. 849 * The sections following CONSTRUCTORS are arranged so their 850 * typical alignment matches. 851 * A cacheline is typical/always less than a PAGE_SIZE so 852 * the sections that has this restriction (or similar) 853 * is located before the ones requiring PAGE_SIZE alignment. 854 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 855 * matches the requirement of PAGE_ALIGNED_DATA. 856 * 857 * use 0 as page_align if page_aligned data is not used */ 858 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \ 859 . = ALIGN(PAGE_SIZE); \ 860 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 861 INIT_TASK_DATA(inittask) \ 862 NOSAVE_DATA \ 863 PAGE_ALIGNED_DATA(pagealigned) \ 864 CACHELINE_ALIGNED_DATA(cacheline) \ 865 READ_MOSTLY_DATA(cacheline) \ 866 DATA_DATA \ 867 CONSTRUCTORS \ 868 } \ 869 BUG_TABLE 870 871 #define INIT_TEXT_SECTION(inittext_align) \ 872 . = ALIGN(inittext_align); \ 873 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 874 VMLINUX_SYMBOL(_sinittext) = .; \ 875 INIT_TEXT \ 876 VMLINUX_SYMBOL(_einittext) = .; \ 877 } 878 879 #define INIT_DATA_SECTION(initsetup_align) \ 880 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 881 INIT_DATA \ 882 INIT_SETUP(initsetup_align) \ 883 INIT_CALLS \ 884 CON_INITCALL \ 885 SECURITY_INITCALL \ 886 INIT_RAM_FS \ 887 } 888 889 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 890 . = ALIGN(sbss_align); \ 891 VMLINUX_SYMBOL(__bss_start) = .; \ 892 SBSS(sbss_align) \ 893 BSS(bss_align) \ 894 . = ALIGN(stop_align); \ 895 VMLINUX_SYMBOL(__bss_stop) = .; 896