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 VMLINUX_SYMBOL(init_thread_union) = .; \ 272 VMLINUX_SYMBOL(init_stack) = .; \ 273 *(.data..init_task) \ 274 *(.data..init_thread_info) \ 275 . = VMLINUX_SYMBOL(__start_init_task) + THREAD_SIZE; \ 276 VMLINUX_SYMBOL(__end_init_task) = .; 277 278 /* 279 * Allow architectures to handle ro_after_init data on their 280 * own by defining an empty RO_AFTER_INIT_DATA. 281 */ 282 #ifndef RO_AFTER_INIT_DATA 283 #define RO_AFTER_INIT_DATA \ 284 VMLINUX_SYMBOL(__start_ro_after_init) = .; \ 285 *(.data..ro_after_init) \ 286 VMLINUX_SYMBOL(__end_ro_after_init) = .; 287 #endif 288 289 /* 290 * Read only Data 291 */ 292 #define RO_DATA_SECTION(align) \ 293 . = ALIGN((align)); \ 294 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 295 VMLINUX_SYMBOL(__start_rodata) = .; \ 296 *(.rodata) *(.rodata.*) \ 297 RO_AFTER_INIT_DATA /* Read only after init */ \ 298 KEEP(*(__vermagic)) /* Kernel version magic */ \ 299 . = ALIGN(8); \ 300 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .; \ 301 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \ 302 VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .; \ 303 *(__tracepoints_strings)/* Tracepoints: strings */ \ 304 } \ 305 \ 306 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 307 *(.rodata1) \ 308 } \ 309 \ 310 /* PCI quirks */ \ 311 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 312 VMLINUX_SYMBOL(__start_pci_fixups_early) = .; \ 313 KEEP(*(.pci_fixup_early)) \ 314 VMLINUX_SYMBOL(__end_pci_fixups_early) = .; \ 315 VMLINUX_SYMBOL(__start_pci_fixups_header) = .; \ 316 KEEP(*(.pci_fixup_header)) \ 317 VMLINUX_SYMBOL(__end_pci_fixups_header) = .; \ 318 VMLINUX_SYMBOL(__start_pci_fixups_final) = .; \ 319 KEEP(*(.pci_fixup_final)) \ 320 VMLINUX_SYMBOL(__end_pci_fixups_final) = .; \ 321 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .; \ 322 KEEP(*(.pci_fixup_enable)) \ 323 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .; \ 324 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .; \ 325 KEEP(*(.pci_fixup_resume)) \ 326 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .; \ 327 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .; \ 328 KEEP(*(.pci_fixup_resume_early)) \ 329 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .; \ 330 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .; \ 331 KEEP(*(.pci_fixup_suspend)) \ 332 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .; \ 333 VMLINUX_SYMBOL(__start_pci_fixups_suspend_late) = .; \ 334 KEEP(*(.pci_fixup_suspend_late)) \ 335 VMLINUX_SYMBOL(__end_pci_fixups_suspend_late) = .; \ 336 } \ 337 \ 338 /* Built-in firmware blobs */ \ 339 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \ 340 VMLINUX_SYMBOL(__start_builtin_fw) = .; \ 341 KEEP(*(.builtin_fw)) \ 342 VMLINUX_SYMBOL(__end_builtin_fw) = .; \ 343 } \ 344 \ 345 TRACEDATA \ 346 \ 347 /* Kernel symbol table: Normal symbols */ \ 348 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 349 VMLINUX_SYMBOL(__start___ksymtab) = .; \ 350 KEEP(*(SORT(___ksymtab+*))) \ 351 VMLINUX_SYMBOL(__stop___ksymtab) = .; \ 352 } \ 353 \ 354 /* Kernel symbol table: GPL-only symbols */ \ 355 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 356 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .; \ 357 KEEP(*(SORT(___ksymtab_gpl+*))) \ 358 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .; \ 359 } \ 360 \ 361 /* Kernel symbol table: Normal unused symbols */ \ 362 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \ 363 VMLINUX_SYMBOL(__start___ksymtab_unused) = .; \ 364 KEEP(*(SORT(___ksymtab_unused+*))) \ 365 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .; \ 366 } \ 367 \ 368 /* Kernel symbol table: GPL-only unused symbols */ \ 369 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \ 370 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .; \ 371 KEEP(*(SORT(___ksymtab_unused_gpl+*))) \ 372 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .; \ 373 } \ 374 \ 375 /* Kernel symbol table: GPL-future-only symbols */ \ 376 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \ 377 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .; \ 378 KEEP(*(SORT(___ksymtab_gpl_future+*))) \ 379 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .; \ 380 } \ 381 \ 382 /* Kernel symbol table: Normal symbols */ \ 383 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 384 VMLINUX_SYMBOL(__start___kcrctab) = .; \ 385 KEEP(*(SORT(___kcrctab+*))) \ 386 VMLINUX_SYMBOL(__stop___kcrctab) = .; \ 387 } \ 388 \ 389 /* Kernel symbol table: GPL-only symbols */ \ 390 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 391 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .; \ 392 KEEP(*(SORT(___kcrctab_gpl+*))) \ 393 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .; \ 394 } \ 395 \ 396 /* Kernel symbol table: Normal unused symbols */ \ 397 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \ 398 VMLINUX_SYMBOL(__start___kcrctab_unused) = .; \ 399 KEEP(*(SORT(___kcrctab_unused+*))) \ 400 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .; \ 401 } \ 402 \ 403 /* Kernel symbol table: GPL-only unused symbols */ \ 404 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \ 405 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .; \ 406 KEEP(*(SORT(___kcrctab_unused_gpl+*))) \ 407 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .; \ 408 } \ 409 \ 410 /* Kernel symbol table: GPL-future-only symbols */ \ 411 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \ 412 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .; \ 413 KEEP(*(SORT(___kcrctab_gpl_future+*))) \ 414 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .; \ 415 } \ 416 \ 417 /* Kernel symbol table: strings */ \ 418 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 419 *(__ksymtab_strings) \ 420 } \ 421 \ 422 /* __*init sections */ \ 423 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 424 *(.ref.rodata) \ 425 MEM_KEEP(init.rodata) \ 426 MEM_KEEP(exit.rodata) \ 427 } \ 428 \ 429 /* Built-in module parameters. */ \ 430 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 431 VMLINUX_SYMBOL(__start___param) = .; \ 432 KEEP(*(__param)) \ 433 VMLINUX_SYMBOL(__stop___param) = .; \ 434 } \ 435 \ 436 /* Built-in module versions. */ \ 437 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 438 VMLINUX_SYMBOL(__start___modver) = .; \ 439 KEEP(*(__modver)) \ 440 VMLINUX_SYMBOL(__stop___modver) = .; \ 441 . = ALIGN((align)); \ 442 VMLINUX_SYMBOL(__end_rodata) = .; \ 443 } \ 444 . = ALIGN((align)); 445 446 /* RODATA & RO_DATA provided for backward compatibility. 447 * All archs are supposed to use RO_DATA() */ 448 #define RODATA RO_DATA_SECTION(4096) 449 #define RO_DATA(align) RO_DATA_SECTION(align) 450 451 #define SECURITY_INIT \ 452 .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \ 453 VMLINUX_SYMBOL(__security_initcall_start) = .; \ 454 KEEP(*(.security_initcall.init)) \ 455 VMLINUX_SYMBOL(__security_initcall_end) = .; \ 456 } 457 458 /* 459 * .text section. Map to function alignment to avoid address changes 460 * during second ld run in second ld pass when generating System.map 461 * 462 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead 463 * code elimination is enabled, so these sections should be converted 464 * to use ".." first. 465 */ 466 #define TEXT_TEXT \ 467 ALIGN_FUNCTION(); \ 468 *(.text.hot TEXT_MAIN .text.fixup .text.unlikely) \ 469 *(.text..refcount) \ 470 *(.ref.text) \ 471 MEM_KEEP(init.text) \ 472 MEM_KEEP(exit.text) \ 473 474 475 /* sched.text is aling to function alignment to secure we have same 476 * address even at second ld pass when generating System.map */ 477 #define SCHED_TEXT \ 478 ALIGN_FUNCTION(); \ 479 VMLINUX_SYMBOL(__sched_text_start) = .; \ 480 *(.sched.text) \ 481 VMLINUX_SYMBOL(__sched_text_end) = .; 482 483 /* spinlock.text is aling to function alignment to secure we have same 484 * address even at second ld pass when generating System.map */ 485 #define LOCK_TEXT \ 486 ALIGN_FUNCTION(); \ 487 VMLINUX_SYMBOL(__lock_text_start) = .; \ 488 *(.spinlock.text) \ 489 VMLINUX_SYMBOL(__lock_text_end) = .; 490 491 #define CPUIDLE_TEXT \ 492 ALIGN_FUNCTION(); \ 493 VMLINUX_SYMBOL(__cpuidle_text_start) = .; \ 494 *(.cpuidle.text) \ 495 VMLINUX_SYMBOL(__cpuidle_text_end) = .; 496 497 #define KPROBES_TEXT \ 498 ALIGN_FUNCTION(); \ 499 VMLINUX_SYMBOL(__kprobes_text_start) = .; \ 500 *(.kprobes.text) \ 501 VMLINUX_SYMBOL(__kprobes_text_end) = .; 502 503 #define ENTRY_TEXT \ 504 ALIGN_FUNCTION(); \ 505 VMLINUX_SYMBOL(__entry_text_start) = .; \ 506 *(.entry.text) \ 507 VMLINUX_SYMBOL(__entry_text_end) = .; 508 509 #define IRQENTRY_TEXT \ 510 ALIGN_FUNCTION(); \ 511 VMLINUX_SYMBOL(__irqentry_text_start) = .; \ 512 *(.irqentry.text) \ 513 VMLINUX_SYMBOL(__irqentry_text_end) = .; 514 515 #define SOFTIRQENTRY_TEXT \ 516 ALIGN_FUNCTION(); \ 517 VMLINUX_SYMBOL(__softirqentry_text_start) = .; \ 518 *(.softirqentry.text) \ 519 VMLINUX_SYMBOL(__softirqentry_text_end) = .; 520 521 /* Section used for early init (in .S files) */ 522 #define HEAD_TEXT *(.head.text) 523 524 #define HEAD_TEXT_SECTION \ 525 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 526 HEAD_TEXT \ 527 } 528 529 /* 530 * Exception table 531 */ 532 #define EXCEPTION_TABLE(align) \ 533 . = ALIGN(align); \ 534 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 535 VMLINUX_SYMBOL(__start___ex_table) = .; \ 536 KEEP(*(__ex_table)) \ 537 VMLINUX_SYMBOL(__stop___ex_table) = .; \ 538 } 539 540 /* 541 * Init task 542 */ 543 #define INIT_TASK_DATA_SECTION(align) \ 544 . = ALIGN(align); \ 545 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 546 INIT_TASK_DATA(align) \ 547 } 548 549 #ifdef CONFIG_CONSTRUCTORS 550 #define KERNEL_CTORS() . = ALIGN(8); \ 551 VMLINUX_SYMBOL(__ctors_start) = .; \ 552 KEEP(*(.ctors)) \ 553 KEEP(*(SORT(.init_array.*))) \ 554 KEEP(*(.init_array)) \ 555 VMLINUX_SYMBOL(__ctors_end) = .; 556 #else 557 #define KERNEL_CTORS() 558 #endif 559 560 /* init and exit section handling */ 561 #define INIT_DATA \ 562 KEEP(*(SORT(___kentry+*))) \ 563 *(.init.data) \ 564 MEM_DISCARD(init.data) \ 565 KERNEL_CTORS() \ 566 MCOUNT_REC() \ 567 *(.init.rodata) \ 568 FTRACE_EVENTS() \ 569 TRACE_SYSCALLS() \ 570 KPROBE_BLACKLIST() \ 571 MEM_DISCARD(init.rodata) \ 572 CLK_OF_TABLES() \ 573 RESERVEDMEM_OF_TABLES() \ 574 TIMER_OF_TABLES() \ 575 IOMMU_OF_TABLES() \ 576 CPU_METHOD_OF_TABLES() \ 577 CPUIDLE_METHOD_OF_TABLES() \ 578 KERNEL_DTB() \ 579 IRQCHIP_OF_MATCH_TABLE() \ 580 ACPI_PROBE_TABLE(irqchip) \ 581 ACPI_PROBE_TABLE(timer) \ 582 ACPI_PROBE_TABLE(iort) \ 583 EARLYCON_TABLE() 584 585 #define INIT_TEXT \ 586 *(.init.text) \ 587 *(.text.startup) \ 588 MEM_DISCARD(init.text) 589 590 #define EXIT_DATA \ 591 *(.exit.data) \ 592 *(.fini_array) \ 593 *(.dtors) \ 594 MEM_DISCARD(exit.data) \ 595 MEM_DISCARD(exit.rodata) 596 597 #define EXIT_TEXT \ 598 *(.exit.text) \ 599 *(.text.exit) \ 600 MEM_DISCARD(exit.text) 601 602 #define EXIT_CALL \ 603 *(.exitcall.exit) 604 605 /* 606 * bss (Block Started by Symbol) - uninitialized data 607 * zeroed during startup 608 */ 609 #define SBSS(sbss_align) \ 610 . = ALIGN(sbss_align); \ 611 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 612 *(.dynsbss) \ 613 *(.sbss) \ 614 *(.scommon) \ 615 } 616 617 /* 618 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 619 * sections to the front of bss. 620 */ 621 #ifndef BSS_FIRST_SECTIONS 622 #define BSS_FIRST_SECTIONS 623 #endif 624 625 #define BSS(bss_align) \ 626 . = ALIGN(bss_align); \ 627 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 628 BSS_FIRST_SECTIONS \ 629 *(.bss..page_aligned) \ 630 *(.dynbss) \ 631 *(BSS_MAIN) \ 632 *(COMMON) \ 633 } 634 635 /* 636 * DWARF debug sections. 637 * Symbols in the DWARF debugging sections are relative to 638 * the beginning of the section so we begin them at 0. 639 */ 640 #define DWARF_DEBUG \ 641 /* DWARF 1 */ \ 642 .debug 0 : { *(.debug) } \ 643 .line 0 : { *(.line) } \ 644 /* GNU DWARF 1 extensions */ \ 645 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 646 .debug_sfnames 0 : { *(.debug_sfnames) } \ 647 /* DWARF 1.1 and DWARF 2 */ \ 648 .debug_aranges 0 : { *(.debug_aranges) } \ 649 .debug_pubnames 0 : { *(.debug_pubnames) } \ 650 /* DWARF 2 */ \ 651 .debug_info 0 : { *(.debug_info \ 652 .gnu.linkonce.wi.*) } \ 653 .debug_abbrev 0 : { *(.debug_abbrev) } \ 654 .debug_line 0 : { *(.debug_line) } \ 655 .debug_frame 0 : { *(.debug_frame) } \ 656 .debug_str 0 : { *(.debug_str) } \ 657 .debug_loc 0 : { *(.debug_loc) } \ 658 .debug_macinfo 0 : { *(.debug_macinfo) } \ 659 .debug_pubtypes 0 : { *(.debug_pubtypes) } \ 660 /* DWARF 3 */ \ 661 .debug_ranges 0 : { *(.debug_ranges) } \ 662 /* SGI/MIPS DWARF 2 extensions */ \ 663 .debug_weaknames 0 : { *(.debug_weaknames) } \ 664 .debug_funcnames 0 : { *(.debug_funcnames) } \ 665 .debug_typenames 0 : { *(.debug_typenames) } \ 666 .debug_varnames 0 : { *(.debug_varnames) } \ 667 /* GNU DWARF 2 extensions */ \ 668 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \ 669 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \ 670 /* DWARF 4 */ \ 671 .debug_types 0 : { *(.debug_types) } \ 672 /* DWARF 5 */ \ 673 .debug_macro 0 : { *(.debug_macro) } \ 674 .debug_addr 0 : { *(.debug_addr) } 675 676 /* Stabs debugging sections. */ 677 #define STABS_DEBUG \ 678 .stab 0 : { *(.stab) } \ 679 .stabstr 0 : { *(.stabstr) } \ 680 .stab.excl 0 : { *(.stab.excl) } \ 681 .stab.exclstr 0 : { *(.stab.exclstr) } \ 682 .stab.index 0 : { *(.stab.index) } \ 683 .stab.indexstr 0 : { *(.stab.indexstr) } \ 684 .comment 0 : { *(.comment) } 685 686 #ifdef CONFIG_GENERIC_BUG 687 #define BUG_TABLE \ 688 . = ALIGN(8); \ 689 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 690 VMLINUX_SYMBOL(__start___bug_table) = .; \ 691 KEEP(*(__bug_table)) \ 692 VMLINUX_SYMBOL(__stop___bug_table) = .; \ 693 } 694 #else 695 #define BUG_TABLE 696 #endif 697 698 #ifdef CONFIG_UNWINDER_ORC 699 #define ORC_UNWIND_TABLE \ 700 . = ALIGN(4); \ 701 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \ 702 VMLINUX_SYMBOL(__start_orc_unwind_ip) = .; \ 703 KEEP(*(.orc_unwind_ip)) \ 704 VMLINUX_SYMBOL(__stop_orc_unwind_ip) = .; \ 705 } \ 706 . = ALIGN(6); \ 707 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \ 708 VMLINUX_SYMBOL(__start_orc_unwind) = .; \ 709 KEEP(*(.orc_unwind)) \ 710 VMLINUX_SYMBOL(__stop_orc_unwind) = .; \ 711 } \ 712 . = ALIGN(4); \ 713 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \ 714 VMLINUX_SYMBOL(orc_lookup) = .; \ 715 . += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) / \ 716 LOOKUP_BLOCK_SIZE) + 1) * 4; \ 717 VMLINUX_SYMBOL(orc_lookup_end) = .; \ 718 } 719 #else 720 #define ORC_UNWIND_TABLE 721 #endif 722 723 #ifdef CONFIG_PM_TRACE 724 #define TRACEDATA \ 725 . = ALIGN(4); \ 726 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 727 VMLINUX_SYMBOL(__tracedata_start) = .; \ 728 KEEP(*(.tracedata)) \ 729 VMLINUX_SYMBOL(__tracedata_end) = .; \ 730 } 731 #else 732 #define TRACEDATA 733 #endif 734 735 #define NOTES \ 736 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 737 VMLINUX_SYMBOL(__start_notes) = .; \ 738 *(.note.*) \ 739 VMLINUX_SYMBOL(__stop_notes) = .; \ 740 } 741 742 #define INIT_SETUP(initsetup_align) \ 743 . = ALIGN(initsetup_align); \ 744 VMLINUX_SYMBOL(__setup_start) = .; \ 745 KEEP(*(.init.setup)) \ 746 VMLINUX_SYMBOL(__setup_end) = .; 747 748 #define INIT_CALLS_LEVEL(level) \ 749 VMLINUX_SYMBOL(__initcall##level##_start) = .; \ 750 KEEP(*(.initcall##level##.init)) \ 751 KEEP(*(.initcall##level##s.init)) \ 752 753 #define INIT_CALLS \ 754 VMLINUX_SYMBOL(__initcall_start) = .; \ 755 KEEP(*(.initcallearly.init)) \ 756 INIT_CALLS_LEVEL(0) \ 757 INIT_CALLS_LEVEL(1) \ 758 INIT_CALLS_LEVEL(2) \ 759 INIT_CALLS_LEVEL(3) \ 760 INIT_CALLS_LEVEL(4) \ 761 INIT_CALLS_LEVEL(5) \ 762 INIT_CALLS_LEVEL(rootfs) \ 763 INIT_CALLS_LEVEL(6) \ 764 INIT_CALLS_LEVEL(7) \ 765 VMLINUX_SYMBOL(__initcall_end) = .; 766 767 #define CON_INITCALL \ 768 VMLINUX_SYMBOL(__con_initcall_start) = .; \ 769 KEEP(*(.con_initcall.init)) \ 770 VMLINUX_SYMBOL(__con_initcall_end) = .; 771 772 #define SECURITY_INITCALL \ 773 VMLINUX_SYMBOL(__security_initcall_start) = .; \ 774 KEEP(*(.security_initcall.init)) \ 775 VMLINUX_SYMBOL(__security_initcall_end) = .; 776 777 #ifdef CONFIG_BLK_DEV_INITRD 778 #define INIT_RAM_FS \ 779 . = ALIGN(4); \ 780 VMLINUX_SYMBOL(__initramfs_start) = .; \ 781 KEEP(*(.init.ramfs)) \ 782 . = ALIGN(8); \ 783 KEEP(*(.init.ramfs.info)) 784 #else 785 #define INIT_RAM_FS 786 #endif 787 788 /* 789 * Memory encryption operates on a page basis. Since we need to clear 790 * the memory encryption mask for this section, it needs to be aligned 791 * on a page boundary and be a page-size multiple in length. 792 * 793 * Note: We use a separate section so that only this section gets 794 * decrypted to avoid exposing more than we wish. 795 */ 796 #ifdef CONFIG_AMD_MEM_ENCRYPT 797 #define PERCPU_DECRYPTED_SECTION \ 798 . = ALIGN(PAGE_SIZE); \ 799 *(.data..percpu..decrypted) \ 800 . = ALIGN(PAGE_SIZE); 801 #else 802 #define PERCPU_DECRYPTED_SECTION 803 #endif 804 805 806 /* 807 * Default discarded sections. 808 * 809 * Some archs want to discard exit text/data at runtime rather than 810 * link time due to cross-section references such as alt instructions, 811 * bug table, eh_frame, etc. DISCARDS must be the last of output 812 * section definitions so that such archs put those in earlier section 813 * definitions. 814 */ 815 #define DISCARDS \ 816 /DISCARD/ : { \ 817 EXIT_TEXT \ 818 EXIT_DATA \ 819 EXIT_CALL \ 820 *(.discard) \ 821 *(.discard.*) \ 822 } 823 824 /** 825 * PERCPU_INPUT - the percpu input sections 826 * @cacheline: cacheline size 827 * 828 * The core percpu section names and core symbols which do not rely 829 * directly upon load addresses. 830 * 831 * @cacheline is used to align subsections to avoid false cacheline 832 * sharing between subsections for different purposes. 833 */ 834 #define PERCPU_INPUT(cacheline) \ 835 VMLINUX_SYMBOL(__per_cpu_start) = .; \ 836 *(.data..percpu..first) \ 837 . = ALIGN(PAGE_SIZE); \ 838 *(.data..percpu..page_aligned) \ 839 . = ALIGN(cacheline); \ 840 *(.data..percpu..read_mostly) \ 841 . = ALIGN(cacheline); \ 842 *(.data..percpu) \ 843 *(.data..percpu..shared_aligned) \ 844 PERCPU_DECRYPTED_SECTION \ 845 VMLINUX_SYMBOL(__per_cpu_end) = .; 846 847 /** 848 * PERCPU_VADDR - define output section for percpu area 849 * @cacheline: cacheline size 850 * @vaddr: explicit base address (optional) 851 * @phdr: destination PHDR (optional) 852 * 853 * Macro which expands to output section for percpu area. 854 * 855 * @cacheline is used to align subsections to avoid false cacheline 856 * sharing between subsections for different purposes. 857 * 858 * If @vaddr is not blank, it specifies explicit base address and all 859 * percpu symbols will be offset from the given address. If blank, 860 * @vaddr always equals @laddr + LOAD_OFFSET. 861 * 862 * @phdr defines the output PHDR to use if not blank. Be warned that 863 * output PHDR is sticky. If @phdr is specified, the next output 864 * section in the linker script will go there too. @phdr should have 865 * a leading colon. 866 * 867 * Note that this macros defines __per_cpu_load as an absolute symbol. 868 * If there is no need to put the percpu section at a predetermined 869 * address, use PERCPU_SECTION. 870 */ 871 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 872 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 873 .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load) \ 874 - LOAD_OFFSET) { \ 875 PERCPU_INPUT(cacheline) \ 876 } phdr \ 877 . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu); 878 879 /** 880 * PERCPU_SECTION - define output section for percpu area, simple version 881 * @cacheline: cacheline size 882 * 883 * Align to PAGE_SIZE and outputs output section for percpu area. This 884 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 885 * __per_cpu_start will be identical. 886 * 887 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 888 * except that __per_cpu_load is defined as a relative symbol against 889 * .data..percpu which is required for relocatable x86_32 configuration. 890 */ 891 #define PERCPU_SECTION(cacheline) \ 892 . = ALIGN(PAGE_SIZE); \ 893 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 894 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 895 PERCPU_INPUT(cacheline) \ 896 } 897 898 899 /* 900 * Definition of the high level *_SECTION macros 901 * They will fit only a subset of the architectures 902 */ 903 904 905 /* 906 * Writeable data. 907 * All sections are combined in a single .data section. 908 * The sections following CONSTRUCTORS are arranged so their 909 * typical alignment matches. 910 * A cacheline is typical/always less than a PAGE_SIZE so 911 * the sections that has this restriction (or similar) 912 * is located before the ones requiring PAGE_SIZE alignment. 913 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 914 * matches the requirement of PAGE_ALIGNED_DATA. 915 * 916 * use 0 as page_align if page_aligned data is not used */ 917 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \ 918 . = ALIGN(PAGE_SIZE); \ 919 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 920 INIT_TASK_DATA(inittask) \ 921 NOSAVE_DATA \ 922 PAGE_ALIGNED_DATA(pagealigned) \ 923 CACHELINE_ALIGNED_DATA(cacheline) \ 924 READ_MOSTLY_DATA(cacheline) \ 925 DATA_DATA \ 926 CONSTRUCTORS \ 927 } \ 928 BUG_TABLE \ 929 930 #define INIT_TEXT_SECTION(inittext_align) \ 931 . = ALIGN(inittext_align); \ 932 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 933 VMLINUX_SYMBOL(_sinittext) = .; \ 934 INIT_TEXT \ 935 VMLINUX_SYMBOL(_einittext) = .; \ 936 } 937 938 #define INIT_DATA_SECTION(initsetup_align) \ 939 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 940 INIT_DATA \ 941 INIT_SETUP(initsetup_align) \ 942 INIT_CALLS \ 943 CON_INITCALL \ 944 SECURITY_INITCALL \ 945 INIT_RAM_FS \ 946 } 947 948 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 949 . = ALIGN(sbss_align); \ 950 VMLINUX_SYMBOL(__bss_start) = .; \ 951 SBSS(sbss_align) \ 952 BSS(bss_align) \ 953 . = ALIGN(stop_align); \ 954 VMLINUX_SYMBOL(__bss_stop) = .; 955