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 *(_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 *(_ftrace_events) \ 127 VMLINUX_SYMBOL(__stop_ftrace_events) = .; 128 #else 129 #define FTRACE_EVENTS() 130 #endif 131 132 #ifdef CONFIG_TRACING 133 #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .; \ 134 *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \ 135 VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .; 136 #define TRACEPOINT_STR() VMLINUX_SYMBOL(__start___tracepoint_str) = .; \ 137 *(__tracepoint_str) /* Trace_printk fmt' pointer */ \ 138 VMLINUX_SYMBOL(__stop___tracepoint_str) = .; 139 #else 140 #define TRACE_PRINTKS() 141 #define TRACEPOINT_STR() 142 #endif 143 144 #ifdef CONFIG_FTRACE_SYSCALLS 145 #define TRACE_SYSCALLS() . = ALIGN(8); \ 146 VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \ 147 *(__syscalls_metadata) \ 148 VMLINUX_SYMBOL(__stop_syscalls_metadata) = .; 149 #else 150 #define TRACE_SYSCALLS() 151 #endif 152 153 154 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name) 155 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name) 156 #define OF_TABLE(cfg, name) __OF_TABLE(config_enabled(cfg), name) 157 #define _OF_TABLE_0(name) 158 #define _OF_TABLE_1(name) \ 159 . = ALIGN(8); \ 160 VMLINUX_SYMBOL(__##name##_of_table) = .; \ 161 *(__##name##_of_table) \ 162 *(__##name##_of_table_end) 163 164 #define CLKSRC_OF_TABLES() OF_TABLE(CONFIG_CLKSRC_OF, clksrc) 165 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip) 166 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk) 167 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem) 168 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method) 169 #define EARLYCON_OF_TABLES() OF_TABLE(CONFIG_SERIAL_EARLYCON, earlycon) 170 171 #define KERNEL_DTB() \ 172 STRUCT_ALIGN(); \ 173 VMLINUX_SYMBOL(__dtb_start) = .; \ 174 *(.dtb.init.rodata) \ 175 VMLINUX_SYMBOL(__dtb_end) = .; 176 177 /* .data section */ 178 #define DATA_DATA \ 179 *(.data) \ 180 *(.ref.data) \ 181 *(.data..shared_aligned) /* percpu related */ \ 182 MEM_KEEP(init.data) \ 183 MEM_KEEP(exit.data) \ 184 *(.data.unlikely) \ 185 STRUCT_ALIGN(); \ 186 *(__tracepoints) \ 187 /* implement dynamic printk debug */ \ 188 . = ALIGN(8); \ 189 VMLINUX_SYMBOL(__start___jump_table) = .; \ 190 *(__jump_table) \ 191 VMLINUX_SYMBOL(__stop___jump_table) = .; \ 192 . = ALIGN(8); \ 193 VMLINUX_SYMBOL(__start___verbose) = .; \ 194 *(__verbose) \ 195 VMLINUX_SYMBOL(__stop___verbose) = .; \ 196 LIKELY_PROFILE() \ 197 BRANCH_PROFILE() \ 198 TRACE_PRINTKS() \ 199 TRACEPOINT_STR() 200 201 /* 202 * Data section helpers 203 */ 204 #define NOSAVE_DATA \ 205 . = ALIGN(PAGE_SIZE); \ 206 VMLINUX_SYMBOL(__nosave_begin) = .; \ 207 *(.data..nosave) \ 208 . = ALIGN(PAGE_SIZE); \ 209 VMLINUX_SYMBOL(__nosave_end) = .; 210 211 #define PAGE_ALIGNED_DATA(page_align) \ 212 . = ALIGN(page_align); \ 213 *(.data..page_aligned) 214 215 #define READ_MOSTLY_DATA(align) \ 216 . = ALIGN(align); \ 217 *(.data..read_mostly) \ 218 . = ALIGN(align); 219 220 #define CACHELINE_ALIGNED_DATA(align) \ 221 . = ALIGN(align); \ 222 *(.data..cacheline_aligned) 223 224 #define INIT_TASK_DATA(align) \ 225 . = ALIGN(align); \ 226 *(.data..init_task) 227 228 /* 229 * Allow architectures to handle ro_after_init data on their 230 * own by defining an empty RO_AFTER_INIT_DATA. 231 */ 232 #ifndef RO_AFTER_INIT_DATA 233 #define RO_AFTER_INIT_DATA *(.data..ro_after_init) 234 #endif 235 236 /* 237 * Read only Data 238 */ 239 #define RO_DATA_SECTION(align) \ 240 . = ALIGN((align)); \ 241 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 242 VMLINUX_SYMBOL(__start_rodata) = .; \ 243 *(.rodata) *(.rodata.*) \ 244 RO_AFTER_INIT_DATA /* Read only after init */ \ 245 *(__vermagic) /* Kernel version magic */ \ 246 . = ALIGN(8); \ 247 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .; \ 248 *(__tracepoints_ptrs) /* Tracepoints: pointer array */\ 249 VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .; \ 250 *(__tracepoints_strings)/* Tracepoints: strings */ \ 251 } \ 252 \ 253 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 254 *(.rodata1) \ 255 } \ 256 \ 257 BUG_TABLE \ 258 \ 259 /* PCI quirks */ \ 260 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 261 VMLINUX_SYMBOL(__start_pci_fixups_early) = .; \ 262 *(.pci_fixup_early) \ 263 VMLINUX_SYMBOL(__end_pci_fixups_early) = .; \ 264 VMLINUX_SYMBOL(__start_pci_fixups_header) = .; \ 265 *(.pci_fixup_header) \ 266 VMLINUX_SYMBOL(__end_pci_fixups_header) = .; \ 267 VMLINUX_SYMBOL(__start_pci_fixups_final) = .; \ 268 *(.pci_fixup_final) \ 269 VMLINUX_SYMBOL(__end_pci_fixups_final) = .; \ 270 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .; \ 271 *(.pci_fixup_enable) \ 272 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .; \ 273 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .; \ 274 *(.pci_fixup_resume) \ 275 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .; \ 276 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .; \ 277 *(.pci_fixup_resume_early) \ 278 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .; \ 279 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .; \ 280 *(.pci_fixup_suspend) \ 281 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .; \ 282 VMLINUX_SYMBOL(__start_pci_fixups_suspend_late) = .; \ 283 *(.pci_fixup_suspend_late) \ 284 VMLINUX_SYMBOL(__end_pci_fixups_suspend_late) = .; \ 285 } \ 286 \ 287 /* Built-in firmware blobs */ \ 288 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \ 289 VMLINUX_SYMBOL(__start_builtin_fw) = .; \ 290 *(.builtin_fw) \ 291 VMLINUX_SYMBOL(__end_builtin_fw) = .; \ 292 } \ 293 \ 294 TRACEDATA \ 295 \ 296 /* Kernel symbol table: Normal symbols */ \ 297 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 298 VMLINUX_SYMBOL(__start___ksymtab) = .; \ 299 *(SORT(___ksymtab+*)) \ 300 VMLINUX_SYMBOL(__stop___ksymtab) = .; \ 301 } \ 302 \ 303 /* Kernel symbol table: GPL-only symbols */ \ 304 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 305 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .; \ 306 *(SORT(___ksymtab_gpl+*)) \ 307 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .; \ 308 } \ 309 \ 310 /* Kernel symbol table: Normal unused symbols */ \ 311 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \ 312 VMLINUX_SYMBOL(__start___ksymtab_unused) = .; \ 313 *(SORT(___ksymtab_unused+*)) \ 314 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .; \ 315 } \ 316 \ 317 /* Kernel symbol table: GPL-only unused symbols */ \ 318 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \ 319 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .; \ 320 *(SORT(___ksymtab_unused_gpl+*)) \ 321 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .; \ 322 } \ 323 \ 324 /* Kernel symbol table: GPL-future-only symbols */ \ 325 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \ 326 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .; \ 327 *(SORT(___ksymtab_gpl_future+*)) \ 328 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .; \ 329 } \ 330 \ 331 /* Kernel symbol table: Normal symbols */ \ 332 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 333 VMLINUX_SYMBOL(__start___kcrctab) = .; \ 334 *(SORT(___kcrctab+*)) \ 335 VMLINUX_SYMBOL(__stop___kcrctab) = .; \ 336 } \ 337 \ 338 /* Kernel symbol table: GPL-only symbols */ \ 339 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 340 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .; \ 341 *(SORT(___kcrctab_gpl+*)) \ 342 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .; \ 343 } \ 344 \ 345 /* Kernel symbol table: Normal unused symbols */ \ 346 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \ 347 VMLINUX_SYMBOL(__start___kcrctab_unused) = .; \ 348 *(SORT(___kcrctab_unused+*)) \ 349 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .; \ 350 } \ 351 \ 352 /* Kernel symbol table: GPL-only unused symbols */ \ 353 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \ 354 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .; \ 355 *(SORT(___kcrctab_unused_gpl+*)) \ 356 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .; \ 357 } \ 358 \ 359 /* Kernel symbol table: GPL-future-only symbols */ \ 360 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \ 361 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .; \ 362 *(SORT(___kcrctab_gpl_future+*)) \ 363 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .; \ 364 } \ 365 \ 366 /* Kernel symbol table: strings */ \ 367 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 368 *(__ksymtab_strings) \ 369 } \ 370 \ 371 /* __*init sections */ \ 372 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 373 *(.ref.rodata) \ 374 MEM_KEEP(init.rodata) \ 375 MEM_KEEP(exit.rodata) \ 376 } \ 377 \ 378 /* Built-in module parameters. */ \ 379 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 380 VMLINUX_SYMBOL(__start___param) = .; \ 381 *(__param) \ 382 VMLINUX_SYMBOL(__stop___param) = .; \ 383 } \ 384 \ 385 /* Built-in module versions. */ \ 386 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 387 VMLINUX_SYMBOL(__start___modver) = .; \ 388 *(__modver) \ 389 VMLINUX_SYMBOL(__stop___modver) = .; \ 390 . = ALIGN((align)); \ 391 VMLINUX_SYMBOL(__end_rodata) = .; \ 392 } \ 393 . = ALIGN((align)); 394 395 /* RODATA & RO_DATA provided for backward compatibility. 396 * All archs are supposed to use RO_DATA() */ 397 #define RODATA RO_DATA_SECTION(4096) 398 #define RO_DATA(align) RO_DATA_SECTION(align) 399 400 #define SECURITY_INIT \ 401 .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \ 402 VMLINUX_SYMBOL(__security_initcall_start) = .; \ 403 *(.security_initcall.init) \ 404 VMLINUX_SYMBOL(__security_initcall_end) = .; \ 405 } 406 407 /* .text section. Map to function alignment to avoid address changes 408 * during second ld run in second ld pass when generating System.map */ 409 #define TEXT_TEXT \ 410 ALIGN_FUNCTION(); \ 411 *(.text.hot) \ 412 *(.text) \ 413 *(.ref.text) \ 414 MEM_KEEP(init.text) \ 415 MEM_KEEP(exit.text) \ 416 *(.text.unlikely) 417 418 419 /* sched.text is aling to function alignment to secure we have same 420 * address even at second ld pass when generating System.map */ 421 #define SCHED_TEXT \ 422 ALIGN_FUNCTION(); \ 423 VMLINUX_SYMBOL(__sched_text_start) = .; \ 424 *(.sched.text) \ 425 VMLINUX_SYMBOL(__sched_text_end) = .; 426 427 /* spinlock.text is aling to function alignment to secure we have same 428 * address even at second ld pass when generating System.map */ 429 #define LOCK_TEXT \ 430 ALIGN_FUNCTION(); \ 431 VMLINUX_SYMBOL(__lock_text_start) = .; \ 432 *(.spinlock.text) \ 433 VMLINUX_SYMBOL(__lock_text_end) = .; 434 435 #define KPROBES_TEXT \ 436 ALIGN_FUNCTION(); \ 437 VMLINUX_SYMBOL(__kprobes_text_start) = .; \ 438 *(.kprobes.text) \ 439 VMLINUX_SYMBOL(__kprobes_text_end) = .; 440 441 #define ENTRY_TEXT \ 442 ALIGN_FUNCTION(); \ 443 VMLINUX_SYMBOL(__entry_text_start) = .; \ 444 *(.entry.text) \ 445 VMLINUX_SYMBOL(__entry_text_end) = .; 446 447 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 448 #define IRQENTRY_TEXT \ 449 ALIGN_FUNCTION(); \ 450 VMLINUX_SYMBOL(__irqentry_text_start) = .; \ 451 *(.irqentry.text) \ 452 VMLINUX_SYMBOL(__irqentry_text_end) = .; 453 #else 454 #define IRQENTRY_TEXT 455 #endif 456 457 /* Section used for early init (in .S files) */ 458 #define HEAD_TEXT *(.head.text) 459 460 #define HEAD_TEXT_SECTION \ 461 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 462 HEAD_TEXT \ 463 } 464 465 /* 466 * Exception table 467 */ 468 #define EXCEPTION_TABLE(align) \ 469 . = ALIGN(align); \ 470 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 471 VMLINUX_SYMBOL(__start___ex_table) = .; \ 472 *(__ex_table) \ 473 VMLINUX_SYMBOL(__stop___ex_table) = .; \ 474 } 475 476 /* 477 * Init task 478 */ 479 #define INIT_TASK_DATA_SECTION(align) \ 480 . = ALIGN(align); \ 481 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 482 INIT_TASK_DATA(align) \ 483 } 484 485 #ifdef CONFIG_CONSTRUCTORS 486 #define KERNEL_CTORS() . = ALIGN(8); \ 487 VMLINUX_SYMBOL(__ctors_start) = .; \ 488 *(.ctors) \ 489 *(.init_array) \ 490 VMLINUX_SYMBOL(__ctors_end) = .; 491 #else 492 #define KERNEL_CTORS() 493 #endif 494 495 /* init and exit section handling */ 496 #define INIT_DATA \ 497 *(.init.data) \ 498 MEM_DISCARD(init.data) \ 499 KERNEL_CTORS() \ 500 MCOUNT_REC() \ 501 *(.init.rodata) \ 502 FTRACE_EVENTS() \ 503 TRACE_SYSCALLS() \ 504 KPROBE_BLACKLIST() \ 505 MEM_DISCARD(init.rodata) \ 506 CLK_OF_TABLES() \ 507 RESERVEDMEM_OF_TABLES() \ 508 CLKSRC_OF_TABLES() \ 509 CPU_METHOD_OF_TABLES() \ 510 KERNEL_DTB() \ 511 IRQCHIP_OF_MATCH_TABLE() \ 512 EARLYCON_OF_TABLES() 513 514 #define INIT_TEXT \ 515 *(.init.text) \ 516 MEM_DISCARD(init.text) 517 518 #define EXIT_DATA \ 519 *(.exit.data) \ 520 MEM_DISCARD(exit.data) \ 521 MEM_DISCARD(exit.rodata) 522 523 #define EXIT_TEXT \ 524 *(.exit.text) \ 525 MEM_DISCARD(exit.text) 526 527 #define EXIT_CALL \ 528 *(.exitcall.exit) 529 530 /* 531 * bss (Block Started by Symbol) - uninitialized data 532 * zeroed during startup 533 */ 534 #define SBSS(sbss_align) \ 535 . = ALIGN(sbss_align); \ 536 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 537 *(.sbss) \ 538 *(.scommon) \ 539 } 540 541 /* 542 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 543 * sections to the front of bss. 544 */ 545 #ifndef BSS_FIRST_SECTIONS 546 #define BSS_FIRST_SECTIONS 547 #endif 548 549 #define BSS(bss_align) \ 550 . = ALIGN(bss_align); \ 551 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 552 BSS_FIRST_SECTIONS \ 553 *(.bss..page_aligned) \ 554 *(.dynbss) \ 555 *(.bss) \ 556 *(COMMON) \ 557 } 558 559 /* 560 * DWARF debug sections. 561 * Symbols in the DWARF debugging sections are relative to 562 * the beginning of the section so we begin them at 0. 563 */ 564 #define DWARF_DEBUG \ 565 /* DWARF 1 */ \ 566 .debug 0 : { *(.debug) } \ 567 .line 0 : { *(.line) } \ 568 /* GNU DWARF 1 extensions */ \ 569 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 570 .debug_sfnames 0 : { *(.debug_sfnames) } \ 571 /* DWARF 1.1 and DWARF 2 */ \ 572 .debug_aranges 0 : { *(.debug_aranges) } \ 573 .debug_pubnames 0 : { *(.debug_pubnames) } \ 574 /* DWARF 2 */ \ 575 .debug_info 0 : { *(.debug_info \ 576 .gnu.linkonce.wi.*) } \ 577 .debug_abbrev 0 : { *(.debug_abbrev) } \ 578 .debug_line 0 : { *(.debug_line) } \ 579 .debug_frame 0 : { *(.debug_frame) } \ 580 .debug_str 0 : { *(.debug_str) } \ 581 .debug_loc 0 : { *(.debug_loc) } \ 582 .debug_macinfo 0 : { *(.debug_macinfo) } \ 583 /* SGI/MIPS DWARF 2 extensions */ \ 584 .debug_weaknames 0 : { *(.debug_weaknames) } \ 585 .debug_funcnames 0 : { *(.debug_funcnames) } \ 586 .debug_typenames 0 : { *(.debug_typenames) } \ 587 .debug_varnames 0 : { *(.debug_varnames) } \ 588 589 /* Stabs debugging sections. */ 590 #define STABS_DEBUG \ 591 .stab 0 : { *(.stab) } \ 592 .stabstr 0 : { *(.stabstr) } \ 593 .stab.excl 0 : { *(.stab.excl) } \ 594 .stab.exclstr 0 : { *(.stab.exclstr) } \ 595 .stab.index 0 : { *(.stab.index) } \ 596 .stab.indexstr 0 : { *(.stab.indexstr) } \ 597 .comment 0 : { *(.comment) } 598 599 #ifdef CONFIG_GENERIC_BUG 600 #define BUG_TABLE \ 601 . = ALIGN(8); \ 602 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 603 VMLINUX_SYMBOL(__start___bug_table) = .; \ 604 *(__bug_table) \ 605 VMLINUX_SYMBOL(__stop___bug_table) = .; \ 606 } 607 #else 608 #define BUG_TABLE 609 #endif 610 611 #ifdef CONFIG_PM_TRACE 612 #define TRACEDATA \ 613 . = ALIGN(4); \ 614 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 615 VMLINUX_SYMBOL(__tracedata_start) = .; \ 616 *(.tracedata) \ 617 VMLINUX_SYMBOL(__tracedata_end) = .; \ 618 } 619 #else 620 #define TRACEDATA 621 #endif 622 623 #define NOTES \ 624 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 625 VMLINUX_SYMBOL(__start_notes) = .; \ 626 *(.note.*) \ 627 VMLINUX_SYMBOL(__stop_notes) = .; \ 628 } 629 630 #define INIT_SETUP(initsetup_align) \ 631 . = ALIGN(initsetup_align); \ 632 VMLINUX_SYMBOL(__setup_start) = .; \ 633 *(.init.setup) \ 634 VMLINUX_SYMBOL(__setup_end) = .; 635 636 #define INIT_CALLS_LEVEL(level) \ 637 VMLINUX_SYMBOL(__initcall##level##_start) = .; \ 638 *(.initcall##level##.init) \ 639 *(.initcall##level##s.init) \ 640 641 #define INIT_CALLS \ 642 VMLINUX_SYMBOL(__initcall_start) = .; \ 643 *(.initcallearly.init) \ 644 INIT_CALLS_LEVEL(0) \ 645 INIT_CALLS_LEVEL(1) \ 646 INIT_CALLS_LEVEL(2) \ 647 INIT_CALLS_LEVEL(3) \ 648 INIT_CALLS_LEVEL(4) \ 649 INIT_CALLS_LEVEL(5) \ 650 INIT_CALLS_LEVEL(rootfs) \ 651 INIT_CALLS_LEVEL(6) \ 652 INIT_CALLS_LEVEL(7) \ 653 VMLINUX_SYMBOL(__initcall_end) = .; 654 655 #define CON_INITCALL \ 656 VMLINUX_SYMBOL(__con_initcall_start) = .; \ 657 *(.con_initcall.init) \ 658 VMLINUX_SYMBOL(__con_initcall_end) = .; 659 660 #define SECURITY_INITCALL \ 661 VMLINUX_SYMBOL(__security_initcall_start) = .; \ 662 *(.security_initcall.init) \ 663 VMLINUX_SYMBOL(__security_initcall_end) = .; 664 665 #ifdef CONFIG_BLK_DEV_INITRD 666 #define INIT_RAM_FS \ 667 . = ALIGN(4); \ 668 VMLINUX_SYMBOL(__initramfs_start) = .; \ 669 *(.init.ramfs) \ 670 . = ALIGN(8); \ 671 *(.init.ramfs.info) 672 #else 673 #define INIT_RAM_FS 674 #endif 675 676 /* 677 * Default discarded sections. 678 * 679 * Some archs want to discard exit text/data at runtime rather than 680 * link time due to cross-section references such as alt instructions, 681 * bug table, eh_frame, etc. DISCARDS must be the last of output 682 * section definitions so that such archs put those in earlier section 683 * definitions. 684 */ 685 #define DISCARDS \ 686 /DISCARD/ : { \ 687 EXIT_TEXT \ 688 EXIT_DATA \ 689 EXIT_CALL \ 690 *(.discard) \ 691 *(.discard.*) \ 692 } 693 694 /** 695 * PERCPU_INPUT - the percpu input sections 696 * @cacheline: cacheline size 697 * 698 * The core percpu section names and core symbols which do not rely 699 * directly upon load addresses. 700 * 701 * @cacheline is used to align subsections to avoid false cacheline 702 * sharing between subsections for different purposes. 703 */ 704 #define PERCPU_INPUT(cacheline) \ 705 VMLINUX_SYMBOL(__per_cpu_start) = .; \ 706 *(.data..percpu..first) \ 707 . = ALIGN(PAGE_SIZE); \ 708 *(.data..percpu..page_aligned) \ 709 . = ALIGN(cacheline); \ 710 *(.data..percpu..read_mostly) \ 711 . = ALIGN(cacheline); \ 712 *(.data..percpu) \ 713 *(.data..percpu..shared_aligned) \ 714 VMLINUX_SYMBOL(__per_cpu_end) = .; 715 716 /** 717 * PERCPU_VADDR - define output section for percpu area 718 * @cacheline: cacheline size 719 * @vaddr: explicit base address (optional) 720 * @phdr: destination PHDR (optional) 721 * 722 * Macro which expands to output section for percpu area. 723 * 724 * @cacheline is used to align subsections to avoid false cacheline 725 * sharing between subsections for different purposes. 726 * 727 * If @vaddr is not blank, it specifies explicit base address and all 728 * percpu symbols will be offset from the given address. If blank, 729 * @vaddr always equals @laddr + LOAD_OFFSET. 730 * 731 * @phdr defines the output PHDR to use if not blank. Be warned that 732 * output PHDR is sticky. If @phdr is specified, the next output 733 * section in the linker script will go there too. @phdr should have 734 * a leading colon. 735 * 736 * Note that this macros defines __per_cpu_load as an absolute symbol. 737 * If there is no need to put the percpu section at a predetermined 738 * address, use PERCPU_SECTION. 739 */ 740 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 741 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 742 .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load) \ 743 - LOAD_OFFSET) { \ 744 PERCPU_INPUT(cacheline) \ 745 } phdr \ 746 . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu); 747 748 /** 749 * PERCPU_SECTION - define output section for percpu area, simple version 750 * @cacheline: cacheline size 751 * 752 * Align to PAGE_SIZE and outputs output section for percpu area. This 753 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 754 * __per_cpu_start will be identical. 755 * 756 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 757 * except that __per_cpu_load is defined as a relative symbol against 758 * .data..percpu which is required for relocatable x86_32 configuration. 759 */ 760 #define PERCPU_SECTION(cacheline) \ 761 . = ALIGN(PAGE_SIZE); \ 762 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 763 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 764 PERCPU_INPUT(cacheline) \ 765 } 766 767 768 /* 769 * Definition of the high level *_SECTION macros 770 * They will fit only a subset of the architectures 771 */ 772 773 774 /* 775 * Writeable data. 776 * All sections are combined in a single .data section. 777 * The sections following CONSTRUCTORS are arranged so their 778 * typical alignment matches. 779 * A cacheline is typical/always less than a PAGE_SIZE so 780 * the sections that has this restriction (or similar) 781 * is located before the ones requiring PAGE_SIZE alignment. 782 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 783 * matches the requirement of PAGE_ALIGNED_DATA. 784 * 785 * use 0 as page_align if page_aligned data is not used */ 786 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \ 787 . = ALIGN(PAGE_SIZE); \ 788 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 789 INIT_TASK_DATA(inittask) \ 790 NOSAVE_DATA \ 791 PAGE_ALIGNED_DATA(pagealigned) \ 792 CACHELINE_ALIGNED_DATA(cacheline) \ 793 READ_MOSTLY_DATA(cacheline) \ 794 DATA_DATA \ 795 CONSTRUCTORS \ 796 } 797 798 #define INIT_TEXT_SECTION(inittext_align) \ 799 . = ALIGN(inittext_align); \ 800 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 801 VMLINUX_SYMBOL(_sinittext) = .; \ 802 INIT_TEXT \ 803 VMLINUX_SYMBOL(_einittext) = .; \ 804 } 805 806 #define INIT_DATA_SECTION(initsetup_align) \ 807 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 808 INIT_DATA \ 809 INIT_SETUP(initsetup_align) \ 810 INIT_CALLS \ 811 CON_INITCALL \ 812 SECURITY_INITCALL \ 813 INIT_RAM_FS \ 814 } 815 816 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 817 . = ALIGN(sbss_align); \ 818 VMLINUX_SYMBOL(__bss_start) = .; \ 819 SBSS(sbss_align) \ 820 BSS(bss_align) \ 821 . = ALIGN(stop_align); \ 822 VMLINUX_SYMBOL(__bss_stop) = .; 823