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