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 * LD_DEAD_CODE_DATA_ELIMINATION option enables -fdata-sections, which 64 * generates .data.identifier sections, which need to be pulled in with 65 * .data. We don't want to pull in .data..other sections, which Linux 66 * has defined. Same for text and bss. 67 */ 68 #ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 69 #define TEXT_MAIN .text .text.[0-9a-zA-Z_]* 70 #define DATA_MAIN .data .data.[0-9a-zA-Z_]* 71 #define BSS_MAIN .bss .bss.[0-9a-zA-Z_]* 72 #else 73 #define TEXT_MAIN .text 74 #define DATA_MAIN .data 75 #define BSS_MAIN .bss 76 #endif 77 78 /* 79 * Align to a 32 byte boundary equal to the 80 * alignment gcc 4.5 uses for a struct 81 */ 82 #define STRUCT_ALIGNMENT 32 83 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT) 84 85 /* The actual configuration determine if the init/exit sections 86 * are handled as text/data or they can be discarded (which 87 * often happens at runtime) 88 */ 89 #ifdef CONFIG_HOTPLUG_CPU 90 #define CPU_KEEP(sec) *(.cpu##sec) 91 #define CPU_DISCARD(sec) 92 #else 93 #define CPU_KEEP(sec) 94 #define CPU_DISCARD(sec) *(.cpu##sec) 95 #endif 96 97 #if defined(CONFIG_MEMORY_HOTPLUG) 98 #define MEM_KEEP(sec) *(.mem##sec) 99 #define MEM_DISCARD(sec) 100 #else 101 #define MEM_KEEP(sec) 102 #define MEM_DISCARD(sec) *(.mem##sec) 103 #endif 104 105 #ifdef CONFIG_FTRACE_MCOUNT_RECORD 106 #define MCOUNT_REC() . = ALIGN(8); \ 107 VMLINUX_SYMBOL(__start_mcount_loc) = .; \ 108 *(__mcount_loc) \ 109 VMLINUX_SYMBOL(__stop_mcount_loc) = .; 110 #else 111 #define MCOUNT_REC() 112 #endif 113 114 #ifdef CONFIG_TRACE_BRANCH_PROFILING 115 #define LIKELY_PROFILE() VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \ 116 *(_ftrace_annotated_branch) \ 117 VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .; 118 #else 119 #define LIKELY_PROFILE() 120 #endif 121 122 #ifdef CONFIG_PROFILE_ALL_BRANCHES 123 #define BRANCH_PROFILE() VMLINUX_SYMBOL(__start_branch_profile) = .; \ 124 *(_ftrace_branch) \ 125 VMLINUX_SYMBOL(__stop_branch_profile) = .; 126 #else 127 #define BRANCH_PROFILE() 128 #endif 129 130 #ifdef CONFIG_KPROBES 131 #define KPROBE_BLACKLIST() . = ALIGN(8); \ 132 VMLINUX_SYMBOL(__start_kprobe_blacklist) = .; \ 133 KEEP(*(_kprobe_blacklist)) \ 134 VMLINUX_SYMBOL(__stop_kprobe_blacklist) = .; 135 #else 136 #define KPROBE_BLACKLIST() 137 #endif 138 139 #ifdef CONFIG_EVENT_TRACING 140 #define FTRACE_EVENTS() . = ALIGN(8); \ 141 VMLINUX_SYMBOL(__start_ftrace_events) = .; \ 142 KEEP(*(_ftrace_events)) \ 143 VMLINUX_SYMBOL(__stop_ftrace_events) = .; \ 144 VMLINUX_SYMBOL(__start_ftrace_eval_maps) = .; \ 145 KEEP(*(_ftrace_eval_map)) \ 146 VMLINUX_SYMBOL(__stop_ftrace_eval_maps) = .; 147 #else 148 #define FTRACE_EVENTS() 149 #endif 150 151 #ifdef CONFIG_TRACING 152 #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .; \ 153 KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \ 154 VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .; 155 #define TRACEPOINT_STR() VMLINUX_SYMBOL(__start___tracepoint_str) = .; \ 156 KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \ 157 VMLINUX_SYMBOL(__stop___tracepoint_str) = .; 158 #else 159 #define TRACE_PRINTKS() 160 #define TRACEPOINT_STR() 161 #endif 162 163 #ifdef CONFIG_FTRACE_SYSCALLS 164 #define TRACE_SYSCALLS() . = ALIGN(8); \ 165 VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \ 166 KEEP(*(__syscalls_metadata)) \ 167 VMLINUX_SYMBOL(__stop_syscalls_metadata) = .; 168 #else 169 #define TRACE_SYSCALLS() 170 #endif 171 172 #ifdef CONFIG_SERIAL_EARLYCON 173 #define EARLYCON_TABLE() STRUCT_ALIGN(); \ 174 VMLINUX_SYMBOL(__earlycon_table) = .; \ 175 KEEP(*(__earlycon_table)) \ 176 VMLINUX_SYMBOL(__earlycon_table_end) = .; 177 #else 178 #define EARLYCON_TABLE() 179 #endif 180 181 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name) 182 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name) 183 #define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name) 184 #define _OF_TABLE_0(name) 185 #define _OF_TABLE_1(name) \ 186 . = ALIGN(8); \ 187 VMLINUX_SYMBOL(__##name##_of_table) = .; \ 188 KEEP(*(__##name##_of_table)) \ 189 KEEP(*(__##name##_of_table_end)) 190 191 #define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer) 192 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip) 193 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk) 194 #define IOMMU_OF_TABLES() OF_TABLE(CONFIG_OF_IOMMU, iommu) 195 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem) 196 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method) 197 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method) 198 199 #ifdef CONFIG_ACPI 200 #define ACPI_PROBE_TABLE(name) \ 201 . = ALIGN(8); \ 202 VMLINUX_SYMBOL(__##name##_acpi_probe_table) = .; \ 203 KEEP(*(__##name##_acpi_probe_table)) \ 204 VMLINUX_SYMBOL(__##name##_acpi_probe_table_end) = .; 205 #else 206 #define ACPI_PROBE_TABLE(name) 207 #endif 208 209 #define KERNEL_DTB() \ 210 STRUCT_ALIGN(); \ 211 VMLINUX_SYMBOL(__dtb_start) = .; \ 212 KEEP(*(.dtb.init.rodata)) \ 213 VMLINUX_SYMBOL(__dtb_end) = .; 214 215 /* 216 * .data section 217 */ 218 #define DATA_DATA \ 219 *(.xiptext) \ 220 *(DATA_MAIN) \ 221 *(.ref.data) \ 222 *(.data..shared_aligned) /* percpu related */ \ 223 MEM_KEEP(init.data) \ 224 MEM_KEEP(exit.data) \ 225 *(.data.unlikely) \ 226 VMLINUX_SYMBOL(__start_once) = .; \ 227 *(.data.once) \ 228 VMLINUX_SYMBOL(__end_once) = .; \ 229 STRUCT_ALIGN(); \ 230 *(__tracepoints) \ 231 /* implement dynamic printk debug */ \ 232 . = ALIGN(8); \ 233 VMLINUX_SYMBOL(__start___jump_table) = .; \ 234 KEEP(*(__jump_table)) \ 235 VMLINUX_SYMBOL(__stop___jump_table) = .; \ 236 . = ALIGN(8); \ 237 VMLINUX_SYMBOL(__start___verbose) = .; \ 238 KEEP(*(__verbose)) \ 239 VMLINUX_SYMBOL(__stop___verbose) = .; \ 240 LIKELY_PROFILE() \ 241 BRANCH_PROFILE() \ 242 TRACE_PRINTKS() \ 243 TRACEPOINT_STR() 244 245 /* 246 * Data section helpers 247 */ 248 #define NOSAVE_DATA \ 249 . = ALIGN(PAGE_SIZE); \ 250 VMLINUX_SYMBOL(__nosave_begin) = .; \ 251 *(.data..nosave) \ 252 . = ALIGN(PAGE_SIZE); \ 253 VMLINUX_SYMBOL(__nosave_end) = .; 254 255 #define PAGE_ALIGNED_DATA(page_align) \ 256 . = ALIGN(page_align); \ 257 *(.data..page_aligned) 258 259 #define READ_MOSTLY_DATA(align) \ 260 . = ALIGN(align); \ 261 *(.data..read_mostly) \ 262 . = ALIGN(align); 263 264 #define CACHELINE_ALIGNED_DATA(align) \ 265 . = ALIGN(align); \ 266 *(.data..cacheline_aligned) 267 268 #define INIT_TASK_DATA(align) \ 269 . = ALIGN(align); \ 270 VMLINUX_SYMBOL(__start_init_task) = .; \ 271 *(.data..init_task) \ 272 VMLINUX_SYMBOL(__end_init_task) = .; 273 274 /* 275 * Allow architectures to handle ro_after_init data on their 276 * own by defining an empty RO_AFTER_INIT_DATA. 277 */ 278 #ifndef RO_AFTER_INIT_DATA 279 #define RO_AFTER_INIT_DATA \ 280 VMLINUX_SYMBOL(__start_ro_after_init) = .; \ 281 *(.data..ro_after_init) \ 282 VMLINUX_SYMBOL(__end_ro_after_init) = .; 283 #endif 284 285 /* 286 * Read only Data 287 */ 288 #define RO_DATA_SECTION(align) \ 289 . = ALIGN((align)); \ 290 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 291 VMLINUX_SYMBOL(__start_rodata) = .; \ 292 *(.rodata) *(.rodata.*) \ 293 RO_AFTER_INIT_DATA /* Read only after init */ \ 294 KEEP(*(__vermagic)) /* Kernel version magic */ \ 295 . = ALIGN(8); \ 296 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .; \ 297 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \ 298 VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .; \ 299 *(__tracepoints_strings)/* Tracepoints: strings */ \ 300 } \ 301 \ 302 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 303 *(.rodata1) \ 304 } \ 305 \ 306 /* PCI quirks */ \ 307 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 308 VMLINUX_SYMBOL(__start_pci_fixups_early) = .; \ 309 KEEP(*(.pci_fixup_early)) \ 310 VMLINUX_SYMBOL(__end_pci_fixups_early) = .; \ 311 VMLINUX_SYMBOL(__start_pci_fixups_header) = .; \ 312 KEEP(*(.pci_fixup_header)) \ 313 VMLINUX_SYMBOL(__end_pci_fixups_header) = .; \ 314 VMLINUX_SYMBOL(__start_pci_fixups_final) = .; \ 315 KEEP(*(.pci_fixup_final)) \ 316 VMLINUX_SYMBOL(__end_pci_fixups_final) = .; \ 317 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .; \ 318 KEEP(*(.pci_fixup_enable)) \ 319 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .; \ 320 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .; \ 321 KEEP(*(.pci_fixup_resume)) \ 322 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .; \ 323 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .; \ 324 KEEP(*(.pci_fixup_resume_early)) \ 325 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .; \ 326 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .; \ 327 KEEP(*(.pci_fixup_suspend)) \ 328 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .; \ 329 VMLINUX_SYMBOL(__start_pci_fixups_suspend_late) = .; \ 330 KEEP(*(.pci_fixup_suspend_late)) \ 331 VMLINUX_SYMBOL(__end_pci_fixups_suspend_late) = .; \ 332 } \ 333 \ 334 /* Built-in firmware blobs */ \ 335 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \ 336 VMLINUX_SYMBOL(__start_builtin_fw) = .; \ 337 KEEP(*(.builtin_fw)) \ 338 VMLINUX_SYMBOL(__end_builtin_fw) = .; \ 339 } \ 340 \ 341 TRACEDATA \ 342 \ 343 /* Kernel symbol table: Normal symbols */ \ 344 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 345 VMLINUX_SYMBOL(__start___ksymtab) = .; \ 346 KEEP(*(SORT(___ksymtab+*))) \ 347 VMLINUX_SYMBOL(__stop___ksymtab) = .; \ 348 } \ 349 \ 350 /* Kernel symbol table: GPL-only symbols */ \ 351 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 352 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .; \ 353 KEEP(*(SORT(___ksymtab_gpl+*))) \ 354 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .; \ 355 } \ 356 \ 357 /* Kernel symbol table: Normal unused symbols */ \ 358 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \ 359 VMLINUX_SYMBOL(__start___ksymtab_unused) = .; \ 360 KEEP(*(SORT(___ksymtab_unused+*))) \ 361 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .; \ 362 } \ 363 \ 364 /* Kernel symbol table: GPL-only unused symbols */ \ 365 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \ 366 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .; \ 367 KEEP(*(SORT(___ksymtab_unused_gpl+*))) \ 368 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .; \ 369 } \ 370 \ 371 /* Kernel symbol table: GPL-future-only symbols */ \ 372 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \ 373 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .; \ 374 KEEP(*(SORT(___ksymtab_gpl_future+*))) \ 375 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .; \ 376 } \ 377 \ 378 /* Kernel symbol table: Normal symbols */ \ 379 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 380 VMLINUX_SYMBOL(__start___kcrctab) = .; \ 381 KEEP(*(SORT(___kcrctab+*))) \ 382 VMLINUX_SYMBOL(__stop___kcrctab) = .; \ 383 } \ 384 \ 385 /* Kernel symbol table: GPL-only symbols */ \ 386 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 387 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .; \ 388 KEEP(*(SORT(___kcrctab_gpl+*))) \ 389 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .; \ 390 } \ 391 \ 392 /* Kernel symbol table: Normal unused symbols */ \ 393 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \ 394 VMLINUX_SYMBOL(__start___kcrctab_unused) = .; \ 395 KEEP(*(SORT(___kcrctab_unused+*))) \ 396 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .; \ 397 } \ 398 \ 399 /* Kernel symbol table: GPL-only unused symbols */ \ 400 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \ 401 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .; \ 402 KEEP(*(SORT(___kcrctab_unused_gpl+*))) \ 403 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .; \ 404 } \ 405 \ 406 /* Kernel symbol table: GPL-future-only symbols */ \ 407 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \ 408 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .; \ 409 KEEP(*(SORT(___kcrctab_gpl_future+*))) \ 410 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .; \ 411 } \ 412 \ 413 /* Kernel symbol table: strings */ \ 414 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 415 *(__ksymtab_strings) \ 416 } \ 417 \ 418 /* __*init sections */ \ 419 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 420 *(.ref.rodata) \ 421 MEM_KEEP(init.rodata) \ 422 MEM_KEEP(exit.rodata) \ 423 } \ 424 \ 425 /* Built-in module parameters. */ \ 426 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 427 VMLINUX_SYMBOL(__start___param) = .; \ 428 KEEP(*(__param)) \ 429 VMLINUX_SYMBOL(__stop___param) = .; \ 430 } \ 431 \ 432 /* Built-in module versions. */ \ 433 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 434 VMLINUX_SYMBOL(__start___modver) = .; \ 435 KEEP(*(__modver)) \ 436 VMLINUX_SYMBOL(__stop___modver) = .; \ 437 . = ALIGN((align)); \ 438 VMLINUX_SYMBOL(__end_rodata) = .; \ 439 } \ 440 . = ALIGN((align)); 441 442 /* RODATA & RO_DATA provided for backward compatibility. 443 * All archs are supposed to use RO_DATA() */ 444 #define RODATA RO_DATA_SECTION(4096) 445 #define RO_DATA(align) RO_DATA_SECTION(align) 446 447 #define SECURITY_INIT \ 448 .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \ 449 VMLINUX_SYMBOL(__security_initcall_start) = .; \ 450 KEEP(*(.security_initcall.init)) \ 451 VMLINUX_SYMBOL(__security_initcall_end) = .; \ 452 } 453 454 /* 455 * .text section. Map to function alignment to avoid address changes 456 * during second ld run in second ld pass when generating System.map 457 * 458 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead 459 * code elimination is enabled, so these sections should be converted 460 * to use ".." first. 461 */ 462 #define TEXT_TEXT \ 463 ALIGN_FUNCTION(); \ 464 *(.text.hot TEXT_MAIN .text.fixup .text.unlikely) \ 465 *(.text..refcount) \ 466 *(.ref.text) \ 467 MEM_KEEP(init.text) \ 468 MEM_KEEP(exit.text) \ 469 470 471 /* sched.text is aling to function alignment to secure we have same 472 * address even at second ld pass when generating System.map */ 473 #define SCHED_TEXT \ 474 ALIGN_FUNCTION(); \ 475 VMLINUX_SYMBOL(__sched_text_start) = .; \ 476 *(.sched.text) \ 477 VMLINUX_SYMBOL(__sched_text_end) = .; 478 479 /* spinlock.text is aling to function alignment to secure we have same 480 * address even at second ld pass when generating System.map */ 481 #define LOCK_TEXT \ 482 ALIGN_FUNCTION(); \ 483 VMLINUX_SYMBOL(__lock_text_start) = .; \ 484 *(.spinlock.text) \ 485 VMLINUX_SYMBOL(__lock_text_end) = .; 486 487 #define CPUIDLE_TEXT \ 488 ALIGN_FUNCTION(); \ 489 VMLINUX_SYMBOL(__cpuidle_text_start) = .; \ 490 *(.cpuidle.text) \ 491 VMLINUX_SYMBOL(__cpuidle_text_end) = .; 492 493 #define KPROBES_TEXT \ 494 ALIGN_FUNCTION(); \ 495 VMLINUX_SYMBOL(__kprobes_text_start) = .; \ 496 *(.kprobes.text) \ 497 VMLINUX_SYMBOL(__kprobes_text_end) = .; 498 499 #define ENTRY_TEXT \ 500 ALIGN_FUNCTION(); \ 501 VMLINUX_SYMBOL(__entry_text_start) = .; \ 502 *(.entry.text) \ 503 VMLINUX_SYMBOL(__entry_text_end) = .; 504 505 #define IRQENTRY_TEXT \ 506 ALIGN_FUNCTION(); \ 507 VMLINUX_SYMBOL(__irqentry_text_start) = .; \ 508 *(.irqentry.text) \ 509 VMLINUX_SYMBOL(__irqentry_text_end) = .; 510 511 #define SOFTIRQENTRY_TEXT \ 512 ALIGN_FUNCTION(); \ 513 VMLINUX_SYMBOL(__softirqentry_text_start) = .; \ 514 *(.softirqentry.text) \ 515 VMLINUX_SYMBOL(__softirqentry_text_end) = .; 516 517 /* Section used for early init (in .S files) */ 518 #define HEAD_TEXT *(.head.text) 519 520 #define HEAD_TEXT_SECTION \ 521 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 522 HEAD_TEXT \ 523 } 524 525 /* 526 * Exception table 527 */ 528 #define EXCEPTION_TABLE(align) \ 529 . = ALIGN(align); \ 530 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 531 VMLINUX_SYMBOL(__start___ex_table) = .; \ 532 KEEP(*(__ex_table)) \ 533 VMLINUX_SYMBOL(__stop___ex_table) = .; \ 534 } 535 536 /* 537 * Init task 538 */ 539 #define INIT_TASK_DATA_SECTION(align) \ 540 . = ALIGN(align); \ 541 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 542 INIT_TASK_DATA(align) \ 543 } 544 545 #ifdef CONFIG_CONSTRUCTORS 546 #define KERNEL_CTORS() . = ALIGN(8); \ 547 VMLINUX_SYMBOL(__ctors_start) = .; \ 548 KEEP(*(.ctors)) \ 549 KEEP(*(SORT(.init_array.*))) \ 550 KEEP(*(.init_array)) \ 551 VMLINUX_SYMBOL(__ctors_end) = .; 552 #else 553 #define KERNEL_CTORS() 554 #endif 555 556 /* init and exit section handling */ 557 #define INIT_DATA \ 558 KEEP(*(SORT(___kentry+*))) \ 559 *(.init.data) \ 560 MEM_DISCARD(init.data) \ 561 KERNEL_CTORS() \ 562 MCOUNT_REC() \ 563 *(.init.rodata) \ 564 FTRACE_EVENTS() \ 565 TRACE_SYSCALLS() \ 566 KPROBE_BLACKLIST() \ 567 MEM_DISCARD(init.rodata) \ 568 CLK_OF_TABLES() \ 569 RESERVEDMEM_OF_TABLES() \ 570 TIMER_OF_TABLES() \ 571 IOMMU_OF_TABLES() \ 572 CPU_METHOD_OF_TABLES() \ 573 CPUIDLE_METHOD_OF_TABLES() \ 574 KERNEL_DTB() \ 575 IRQCHIP_OF_MATCH_TABLE() \ 576 ACPI_PROBE_TABLE(irqchip) \ 577 ACPI_PROBE_TABLE(timer) \ 578 ACPI_PROBE_TABLE(iort) \ 579 EARLYCON_TABLE() 580 581 #define INIT_TEXT \ 582 *(.init.text) \ 583 *(.text.startup) \ 584 MEM_DISCARD(init.text) 585 586 #define EXIT_DATA \ 587 *(.exit.data) \ 588 *(.fini_array) \ 589 *(.dtors) \ 590 MEM_DISCARD(exit.data) \ 591 MEM_DISCARD(exit.rodata) 592 593 #define EXIT_TEXT \ 594 *(.exit.text) \ 595 *(.text.exit) \ 596 MEM_DISCARD(exit.text) 597 598 #define EXIT_CALL \ 599 *(.exitcall.exit) 600 601 /* 602 * bss (Block Started by Symbol) - uninitialized data 603 * zeroed during startup 604 */ 605 #define SBSS(sbss_align) \ 606 . = ALIGN(sbss_align); \ 607 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 608 *(.dynsbss) \ 609 *(.sbss) \ 610 *(.scommon) \ 611 } 612 613 /* 614 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 615 * sections to the front of bss. 616 */ 617 #ifndef BSS_FIRST_SECTIONS 618 #define BSS_FIRST_SECTIONS 619 #endif 620 621 #define BSS(bss_align) \ 622 . = ALIGN(bss_align); \ 623 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 624 BSS_FIRST_SECTIONS \ 625 *(.bss..page_aligned) \ 626 *(.dynbss) \ 627 *(BSS_MAIN) \ 628 *(COMMON) \ 629 } 630 631 /* 632 * DWARF debug sections. 633 * Symbols in the DWARF debugging sections are relative to 634 * the beginning of the section so we begin them at 0. 635 */ 636 #define DWARF_DEBUG \ 637 /* DWARF 1 */ \ 638 .debug 0 : { *(.debug) } \ 639 .line 0 : { *(.line) } \ 640 /* GNU DWARF 1 extensions */ \ 641 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 642 .debug_sfnames 0 : { *(.debug_sfnames) } \ 643 /* DWARF 1.1 and DWARF 2 */ \ 644 .debug_aranges 0 : { *(.debug_aranges) } \ 645 .debug_pubnames 0 : { *(.debug_pubnames) } \ 646 /* DWARF 2 */ \ 647 .debug_info 0 : { *(.debug_info \ 648 .gnu.linkonce.wi.*) } \ 649 .debug_abbrev 0 : { *(.debug_abbrev) } \ 650 .debug_line 0 : { *(.debug_line) } \ 651 .debug_frame 0 : { *(.debug_frame) } \ 652 .debug_str 0 : { *(.debug_str) } \ 653 .debug_loc 0 : { *(.debug_loc) } \ 654 .debug_macinfo 0 : { *(.debug_macinfo) } \ 655 .debug_pubtypes 0 : { *(.debug_pubtypes) } \ 656 /* DWARF 3 */ \ 657 .debug_ranges 0 : { *(.debug_ranges) } \ 658 /* SGI/MIPS DWARF 2 extensions */ \ 659 .debug_weaknames 0 : { *(.debug_weaknames) } \ 660 .debug_funcnames 0 : { *(.debug_funcnames) } \ 661 .debug_typenames 0 : { *(.debug_typenames) } \ 662 .debug_varnames 0 : { *(.debug_varnames) } \ 663 /* GNU DWARF 2 extensions */ \ 664 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \ 665 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \ 666 /* DWARF 4 */ \ 667 .debug_types 0 : { *(.debug_types) } \ 668 /* DWARF 5 */ \ 669 .debug_macro 0 : { *(.debug_macro) } \ 670 .debug_addr 0 : { *(.debug_addr) } 671 672 /* Stabs debugging sections. */ 673 #define STABS_DEBUG \ 674 .stab 0 : { *(.stab) } \ 675 .stabstr 0 : { *(.stabstr) } \ 676 .stab.excl 0 : { *(.stab.excl) } \ 677 .stab.exclstr 0 : { *(.stab.exclstr) } \ 678 .stab.index 0 : { *(.stab.index) } \ 679 .stab.indexstr 0 : { *(.stab.indexstr) } \ 680 .comment 0 : { *(.comment) } 681 682 #ifdef CONFIG_GENERIC_BUG 683 #define BUG_TABLE \ 684 . = ALIGN(8); \ 685 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 686 VMLINUX_SYMBOL(__start___bug_table) = .; \ 687 KEEP(*(__bug_table)) \ 688 VMLINUX_SYMBOL(__stop___bug_table) = .; \ 689 } 690 #else 691 #define BUG_TABLE 692 #endif 693 694 #ifdef CONFIG_UNWINDER_ORC 695 #define ORC_UNWIND_TABLE \ 696 . = ALIGN(4); \ 697 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \ 698 VMLINUX_SYMBOL(__start_orc_unwind_ip) = .; \ 699 KEEP(*(.orc_unwind_ip)) \ 700 VMLINUX_SYMBOL(__stop_orc_unwind_ip) = .; \ 701 } \ 702 . = ALIGN(6); \ 703 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \ 704 VMLINUX_SYMBOL(__start_orc_unwind) = .; \ 705 KEEP(*(.orc_unwind)) \ 706 VMLINUX_SYMBOL(__stop_orc_unwind) = .; \ 707 } \ 708 . = ALIGN(4); \ 709 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \ 710 VMLINUX_SYMBOL(orc_lookup) = .; \ 711 . += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) / \ 712 LOOKUP_BLOCK_SIZE) + 1) * 4; \ 713 VMLINUX_SYMBOL(orc_lookup_end) = .; \ 714 } 715 #else 716 #define ORC_UNWIND_TABLE 717 #endif 718 719 #ifdef CONFIG_PM_TRACE 720 #define TRACEDATA \ 721 . = ALIGN(4); \ 722 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 723 VMLINUX_SYMBOL(__tracedata_start) = .; \ 724 KEEP(*(.tracedata)) \ 725 VMLINUX_SYMBOL(__tracedata_end) = .; \ 726 } 727 #else 728 #define TRACEDATA 729 #endif 730 731 #define NOTES \ 732 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 733 VMLINUX_SYMBOL(__start_notes) = .; \ 734 *(.note.*) \ 735 VMLINUX_SYMBOL(__stop_notes) = .; \ 736 } 737 738 #define INIT_SETUP(initsetup_align) \ 739 . = ALIGN(initsetup_align); \ 740 VMLINUX_SYMBOL(__setup_start) = .; \ 741 KEEP(*(.init.setup)) \ 742 VMLINUX_SYMBOL(__setup_end) = .; 743 744 #define INIT_CALLS_LEVEL(level) \ 745 VMLINUX_SYMBOL(__initcall##level##_start) = .; \ 746 KEEP(*(.initcall##level##.init)) \ 747 KEEP(*(.initcall##level##s.init)) \ 748 749 #define INIT_CALLS \ 750 VMLINUX_SYMBOL(__initcall_start) = .; \ 751 KEEP(*(.initcallearly.init)) \ 752 INIT_CALLS_LEVEL(0) \ 753 INIT_CALLS_LEVEL(1) \ 754 INIT_CALLS_LEVEL(2) \ 755 INIT_CALLS_LEVEL(3) \ 756 INIT_CALLS_LEVEL(4) \ 757 INIT_CALLS_LEVEL(5) \ 758 INIT_CALLS_LEVEL(rootfs) \ 759 INIT_CALLS_LEVEL(6) \ 760 INIT_CALLS_LEVEL(7) \ 761 VMLINUX_SYMBOL(__initcall_end) = .; 762 763 #define CON_INITCALL \ 764 VMLINUX_SYMBOL(__con_initcall_start) = .; \ 765 KEEP(*(.con_initcall.init)) \ 766 VMLINUX_SYMBOL(__con_initcall_end) = .; 767 768 #define SECURITY_INITCALL \ 769 VMLINUX_SYMBOL(__security_initcall_start) = .; \ 770 KEEP(*(.security_initcall.init)) \ 771 VMLINUX_SYMBOL(__security_initcall_end) = .; 772 773 #ifdef CONFIG_BLK_DEV_INITRD 774 #define INIT_RAM_FS \ 775 . = ALIGN(4); \ 776 VMLINUX_SYMBOL(__initramfs_start) = .; \ 777 KEEP(*(.init.ramfs)) \ 778 . = ALIGN(8); \ 779 KEEP(*(.init.ramfs.info)) 780 #else 781 #define INIT_RAM_FS 782 #endif 783 784 /* 785 * Memory encryption operates on a page basis. Since we need to clear 786 * the memory encryption mask for this section, it needs to be aligned 787 * on a page boundary and be a page-size multiple in length. 788 * 789 * Note: We use a separate section so that only this section gets 790 * decrypted to avoid exposing more than we wish. 791 */ 792 #ifdef CONFIG_AMD_MEM_ENCRYPT 793 #define PERCPU_DECRYPTED_SECTION \ 794 . = ALIGN(PAGE_SIZE); \ 795 *(.data..percpu..decrypted) \ 796 . = ALIGN(PAGE_SIZE); 797 #else 798 #define PERCPU_DECRYPTED_SECTION 799 #endif 800 801 802 /* 803 * Default discarded sections. 804 * 805 * Some archs want to discard exit text/data at runtime rather than 806 * link time due to cross-section references such as alt instructions, 807 * bug table, eh_frame, etc. DISCARDS must be the last of output 808 * section definitions so that such archs put those in earlier section 809 * definitions. 810 */ 811 #define DISCARDS \ 812 /DISCARD/ : { \ 813 EXIT_TEXT \ 814 EXIT_DATA \ 815 EXIT_CALL \ 816 *(.discard) \ 817 *(.discard.*) \ 818 } 819 820 /** 821 * PERCPU_INPUT - the percpu input sections 822 * @cacheline: cacheline size 823 * 824 * The core percpu section names and core symbols which do not rely 825 * directly upon load addresses. 826 * 827 * @cacheline is used to align subsections to avoid false cacheline 828 * sharing between subsections for different purposes. 829 */ 830 #define PERCPU_INPUT(cacheline) \ 831 VMLINUX_SYMBOL(__per_cpu_start) = .; \ 832 *(.data..percpu..first) \ 833 . = ALIGN(PAGE_SIZE); \ 834 *(.data..percpu..page_aligned) \ 835 . = ALIGN(cacheline); \ 836 *(.data..percpu..read_mostly) \ 837 . = ALIGN(cacheline); \ 838 *(.data..percpu) \ 839 *(.data..percpu..shared_aligned) \ 840 PERCPU_DECRYPTED_SECTION \ 841 VMLINUX_SYMBOL(__per_cpu_end) = .; 842 843 /** 844 * PERCPU_VADDR - define output section for percpu area 845 * @cacheline: cacheline size 846 * @vaddr: explicit base address (optional) 847 * @phdr: destination PHDR (optional) 848 * 849 * Macro which expands to output section for percpu area. 850 * 851 * @cacheline is used to align subsections to avoid false cacheline 852 * sharing between subsections for different purposes. 853 * 854 * If @vaddr is not blank, it specifies explicit base address and all 855 * percpu symbols will be offset from the given address. If blank, 856 * @vaddr always equals @laddr + LOAD_OFFSET. 857 * 858 * @phdr defines the output PHDR to use if not blank. Be warned that 859 * output PHDR is sticky. If @phdr is specified, the next output 860 * section in the linker script will go there too. @phdr should have 861 * a leading colon. 862 * 863 * Note that this macros defines __per_cpu_load as an absolute symbol. 864 * If there is no need to put the percpu section at a predetermined 865 * address, use PERCPU_SECTION. 866 */ 867 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 868 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 869 .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load) \ 870 - LOAD_OFFSET) { \ 871 PERCPU_INPUT(cacheline) \ 872 } phdr \ 873 . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu); 874 875 /** 876 * PERCPU_SECTION - define output section for percpu area, simple version 877 * @cacheline: cacheline size 878 * 879 * Align to PAGE_SIZE and outputs output section for percpu area. This 880 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 881 * __per_cpu_start will be identical. 882 * 883 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 884 * except that __per_cpu_load is defined as a relative symbol against 885 * .data..percpu which is required for relocatable x86_32 configuration. 886 */ 887 #define PERCPU_SECTION(cacheline) \ 888 . = ALIGN(PAGE_SIZE); \ 889 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 890 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 891 PERCPU_INPUT(cacheline) \ 892 } 893 894 895 /* 896 * Definition of the high level *_SECTION macros 897 * They will fit only a subset of the architectures 898 */ 899 900 901 /* 902 * Writeable data. 903 * All sections are combined in a single .data section. 904 * The sections following CONSTRUCTORS are arranged so their 905 * typical alignment matches. 906 * A cacheline is typical/always less than a PAGE_SIZE so 907 * the sections that has this restriction (or similar) 908 * is located before the ones requiring PAGE_SIZE alignment. 909 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 910 * matches the requirement of PAGE_ALIGNED_DATA. 911 * 912 * use 0 as page_align if page_aligned data is not used */ 913 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \ 914 . = ALIGN(PAGE_SIZE); \ 915 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 916 INIT_TASK_DATA(inittask) \ 917 NOSAVE_DATA \ 918 PAGE_ALIGNED_DATA(pagealigned) \ 919 CACHELINE_ALIGNED_DATA(cacheline) \ 920 READ_MOSTLY_DATA(cacheline) \ 921 DATA_DATA \ 922 CONSTRUCTORS \ 923 } \ 924 BUG_TABLE \ 925 926 #define INIT_TEXT_SECTION(inittext_align) \ 927 . = ALIGN(inittext_align); \ 928 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 929 VMLINUX_SYMBOL(_sinittext) = .; \ 930 INIT_TEXT \ 931 VMLINUX_SYMBOL(_einittext) = .; \ 932 } 933 934 #define INIT_DATA_SECTION(initsetup_align) \ 935 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 936 INIT_DATA \ 937 INIT_SETUP(initsetup_align) \ 938 INIT_CALLS \ 939 CON_INITCALL \ 940 SECURITY_INITCALL \ 941 INIT_RAM_FS \ 942 } 943 944 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 945 . = ALIGN(sbss_align); \ 946 VMLINUX_SYMBOL(__bss_start) = .; \ 947 SBSS(sbss_align) \ 948 BSS(bss_align) \ 949 . = ALIGN(stop_align); \ 950 VMLINUX_SYMBOL(__bss_stop) = .; 951