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 * [_stext, _etext] is the text section 44 * [_sdata, _edata] is the data section 45 * 46 * Some of the included output section have their own set of constants. 47 * Examples are: [__initramfs_start, __initramfs_end] for initramfs and 48 * [__nosave_begin, __nosave_end] for the nosave data 49 */ 50 51 #ifndef LOAD_OFFSET 52 #define LOAD_OFFSET 0 53 #endif 54 55 #include <linux/export.h> 56 57 /* Align . to a 8 byte boundary equals to maximum function alignment. */ 58 #define ALIGN_FUNCTION() . = ALIGN(8) 59 60 /* 61 * Align to a 32 byte boundary equal to the 62 * alignment gcc 4.5 uses for a struct 63 */ 64 #define STRUCT_ALIGNMENT 32 65 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT) 66 67 /* The actual configuration determine if the init/exit sections 68 * are handled as text/data or they can be discarded (which 69 * often happens at runtime) 70 */ 71 #ifdef CONFIG_HOTPLUG_CPU 72 #define CPU_KEEP(sec) *(.cpu##sec) 73 #define CPU_DISCARD(sec) 74 #else 75 #define CPU_KEEP(sec) 76 #define CPU_DISCARD(sec) *(.cpu##sec) 77 #endif 78 79 #if defined(CONFIG_MEMORY_HOTPLUG) 80 #define MEM_KEEP(sec) *(.mem##sec) 81 #define MEM_DISCARD(sec) 82 #else 83 #define MEM_KEEP(sec) 84 #define MEM_DISCARD(sec) *(.mem##sec) 85 #endif 86 87 #ifdef CONFIG_FTRACE_MCOUNT_RECORD 88 #define MCOUNT_REC() . = ALIGN(8); \ 89 VMLINUX_SYMBOL(__start_mcount_loc) = .; \ 90 *(__mcount_loc) \ 91 VMLINUX_SYMBOL(__stop_mcount_loc) = .; 92 #else 93 #define MCOUNT_REC() 94 #endif 95 96 #ifdef CONFIG_TRACE_BRANCH_PROFILING 97 #define LIKELY_PROFILE() VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \ 98 *(_ftrace_annotated_branch) \ 99 VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .; 100 #else 101 #define LIKELY_PROFILE() 102 #endif 103 104 #ifdef CONFIG_PROFILE_ALL_BRANCHES 105 #define BRANCH_PROFILE() VMLINUX_SYMBOL(__start_branch_profile) = .; \ 106 *(_ftrace_branch) \ 107 VMLINUX_SYMBOL(__stop_branch_profile) = .; 108 #else 109 #define BRANCH_PROFILE() 110 #endif 111 112 #ifdef CONFIG_KPROBES 113 #define KPROBE_BLACKLIST() . = ALIGN(8); \ 114 VMLINUX_SYMBOL(__start_kprobe_blacklist) = .; \ 115 *(_kprobe_blacklist) \ 116 VMLINUX_SYMBOL(__stop_kprobe_blacklist) = .; 117 #else 118 #define KPROBE_BLACKLIST() 119 #endif 120 121 #ifdef CONFIG_EVENT_TRACING 122 #define FTRACE_EVENTS() . = ALIGN(8); \ 123 VMLINUX_SYMBOL(__start_ftrace_events) = .; \ 124 *(_ftrace_events) \ 125 VMLINUX_SYMBOL(__stop_ftrace_events) = .; 126 #else 127 #define FTRACE_EVENTS() 128 #endif 129 130 #ifdef CONFIG_TRACING 131 #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .; \ 132 *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \ 133 VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .; 134 #define TRACEPOINT_STR() VMLINUX_SYMBOL(__start___tracepoint_str) = .; \ 135 *(__tracepoint_str) /* Trace_printk fmt' pointer */ \ 136 VMLINUX_SYMBOL(__stop___tracepoint_str) = .; 137 #else 138 #define TRACE_PRINTKS() 139 #define TRACEPOINT_STR() 140 #endif 141 142 #ifdef CONFIG_FTRACE_SYSCALLS 143 #define TRACE_SYSCALLS() . = ALIGN(8); \ 144 VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \ 145 *(__syscalls_metadata) \ 146 VMLINUX_SYMBOL(__stop_syscalls_metadata) = .; 147 #else 148 #define TRACE_SYSCALLS() 149 #endif 150 151 152 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name) 153 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name) 154 #define OF_TABLE(cfg, name) __OF_TABLE(config_enabled(cfg), name) 155 #define _OF_TABLE_0(name) 156 #define _OF_TABLE_1(name) \ 157 . = ALIGN(8); \ 158 VMLINUX_SYMBOL(__##name##_of_table) = .; \ 159 *(__##name##_of_table) \ 160 *(__##name##_of_table_end) 161 162 #define CLKSRC_OF_TABLES() OF_TABLE(CONFIG_CLKSRC_OF, clksrc) 163 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip) 164 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk) 165 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem) 166 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method) 167 #define EARLYCON_OF_TABLES() OF_TABLE(CONFIG_SERIAL_EARLYCON, earlycon) 168 169 #define KERNEL_DTB() \ 170 STRUCT_ALIGN(); \ 171 VMLINUX_SYMBOL(__dtb_start) = .; \ 172 *(.dtb.init.rodata) \ 173 VMLINUX_SYMBOL(__dtb_end) = .; 174 175 /* .data section */ 176 #define DATA_DATA \ 177 *(.data) \ 178 *(.ref.data) \ 179 *(.data..shared_aligned) /* percpu related */ \ 180 MEM_KEEP(init.data) \ 181 MEM_KEEP(exit.data) \ 182 *(.data.unlikely) \ 183 STRUCT_ALIGN(); \ 184 *(__tracepoints) \ 185 /* implement dynamic printk debug */ \ 186 . = ALIGN(8); \ 187 VMLINUX_SYMBOL(__start___jump_table) = .; \ 188 *(__jump_table) \ 189 VMLINUX_SYMBOL(__stop___jump_table) = .; \ 190 . = ALIGN(8); \ 191 VMLINUX_SYMBOL(__start___verbose) = .; \ 192 *(__verbose) \ 193 VMLINUX_SYMBOL(__stop___verbose) = .; \ 194 LIKELY_PROFILE() \ 195 BRANCH_PROFILE() \ 196 TRACE_PRINTKS() \ 197 TRACEPOINT_STR() 198 199 /* 200 * Data section helpers 201 */ 202 #define NOSAVE_DATA \ 203 . = ALIGN(PAGE_SIZE); \ 204 VMLINUX_SYMBOL(__nosave_begin) = .; \ 205 *(.data..nosave) \ 206 . = ALIGN(PAGE_SIZE); \ 207 VMLINUX_SYMBOL(__nosave_end) = .; 208 209 #define PAGE_ALIGNED_DATA(page_align) \ 210 . = ALIGN(page_align); \ 211 *(.data..page_aligned) 212 213 #define READ_MOSTLY_DATA(align) \ 214 . = ALIGN(align); \ 215 *(.data..read_mostly) \ 216 . = ALIGN(align); 217 218 #define CACHELINE_ALIGNED_DATA(align) \ 219 . = ALIGN(align); \ 220 *(.data..cacheline_aligned) 221 222 #define INIT_TASK_DATA(align) \ 223 . = ALIGN(align); \ 224 *(.data..init_task) 225 226 /* 227 * Read only Data 228 */ 229 #define RO_DATA_SECTION(align) \ 230 . = ALIGN((align)); \ 231 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \ 232 VMLINUX_SYMBOL(__start_rodata) = .; \ 233 *(.rodata) *(.rodata.*) \ 234 *(__vermagic) /* Kernel version magic */ \ 235 . = ALIGN(8); \ 236 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .; \ 237 *(__tracepoints_ptrs) /* Tracepoints: pointer array */\ 238 VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .; \ 239 *(__tracepoints_strings)/* Tracepoints: strings */ \ 240 } \ 241 \ 242 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \ 243 *(.rodata1) \ 244 } \ 245 \ 246 BUG_TABLE \ 247 \ 248 /* PCI quirks */ \ 249 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \ 250 VMLINUX_SYMBOL(__start_pci_fixups_early) = .; \ 251 *(.pci_fixup_early) \ 252 VMLINUX_SYMBOL(__end_pci_fixups_early) = .; \ 253 VMLINUX_SYMBOL(__start_pci_fixups_header) = .; \ 254 *(.pci_fixup_header) \ 255 VMLINUX_SYMBOL(__end_pci_fixups_header) = .; \ 256 VMLINUX_SYMBOL(__start_pci_fixups_final) = .; \ 257 *(.pci_fixup_final) \ 258 VMLINUX_SYMBOL(__end_pci_fixups_final) = .; \ 259 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .; \ 260 *(.pci_fixup_enable) \ 261 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .; \ 262 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .; \ 263 *(.pci_fixup_resume) \ 264 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .; \ 265 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .; \ 266 *(.pci_fixup_resume_early) \ 267 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .; \ 268 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .; \ 269 *(.pci_fixup_suspend) \ 270 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .; \ 271 } \ 272 \ 273 /* Built-in firmware blobs */ \ 274 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \ 275 VMLINUX_SYMBOL(__start_builtin_fw) = .; \ 276 *(.builtin_fw) \ 277 VMLINUX_SYMBOL(__end_builtin_fw) = .; \ 278 } \ 279 \ 280 TRACEDATA \ 281 \ 282 /* Kernel symbol table: Normal symbols */ \ 283 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \ 284 VMLINUX_SYMBOL(__start___ksymtab) = .; \ 285 *(SORT(___ksymtab+*)) \ 286 VMLINUX_SYMBOL(__stop___ksymtab) = .; \ 287 } \ 288 \ 289 /* Kernel symbol table: GPL-only symbols */ \ 290 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \ 291 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .; \ 292 *(SORT(___ksymtab_gpl+*)) \ 293 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .; \ 294 } \ 295 \ 296 /* Kernel symbol table: Normal unused symbols */ \ 297 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \ 298 VMLINUX_SYMBOL(__start___ksymtab_unused) = .; \ 299 *(SORT(___ksymtab_unused+*)) \ 300 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .; \ 301 } \ 302 \ 303 /* Kernel symbol table: GPL-only unused symbols */ \ 304 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \ 305 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .; \ 306 *(SORT(___ksymtab_unused_gpl+*)) \ 307 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .; \ 308 } \ 309 \ 310 /* Kernel symbol table: GPL-future-only symbols */ \ 311 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \ 312 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .; \ 313 *(SORT(___ksymtab_gpl_future+*)) \ 314 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .; \ 315 } \ 316 \ 317 /* Kernel symbol table: Normal symbols */ \ 318 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \ 319 VMLINUX_SYMBOL(__start___kcrctab) = .; \ 320 *(SORT(___kcrctab+*)) \ 321 VMLINUX_SYMBOL(__stop___kcrctab) = .; \ 322 } \ 323 \ 324 /* Kernel symbol table: GPL-only symbols */ \ 325 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \ 326 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .; \ 327 *(SORT(___kcrctab_gpl+*)) \ 328 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .; \ 329 } \ 330 \ 331 /* Kernel symbol table: Normal unused symbols */ \ 332 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \ 333 VMLINUX_SYMBOL(__start___kcrctab_unused) = .; \ 334 *(SORT(___kcrctab_unused+*)) \ 335 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .; \ 336 } \ 337 \ 338 /* Kernel symbol table: GPL-only unused symbols */ \ 339 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \ 340 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .; \ 341 *(SORT(___kcrctab_unused_gpl+*)) \ 342 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .; \ 343 } \ 344 \ 345 /* Kernel symbol table: GPL-future-only symbols */ \ 346 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \ 347 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .; \ 348 *(SORT(___kcrctab_gpl_future+*)) \ 349 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .; \ 350 } \ 351 \ 352 /* Kernel symbol table: strings */ \ 353 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \ 354 *(__ksymtab_strings) \ 355 } \ 356 \ 357 /* __*init sections */ \ 358 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \ 359 *(.ref.rodata) \ 360 MEM_KEEP(init.rodata) \ 361 MEM_KEEP(exit.rodata) \ 362 } \ 363 \ 364 /* Built-in module parameters. */ \ 365 __param : AT(ADDR(__param) - LOAD_OFFSET) { \ 366 VMLINUX_SYMBOL(__start___param) = .; \ 367 *(__param) \ 368 VMLINUX_SYMBOL(__stop___param) = .; \ 369 } \ 370 \ 371 /* Built-in module versions. */ \ 372 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \ 373 VMLINUX_SYMBOL(__start___modver) = .; \ 374 *(__modver) \ 375 VMLINUX_SYMBOL(__stop___modver) = .; \ 376 . = ALIGN((align)); \ 377 VMLINUX_SYMBOL(__end_rodata) = .; \ 378 } \ 379 . = ALIGN((align)); 380 381 /* RODATA & RO_DATA provided for backward compatibility. 382 * All archs are supposed to use RO_DATA() */ 383 #define RODATA RO_DATA_SECTION(4096) 384 #define RO_DATA(align) RO_DATA_SECTION(align) 385 386 #define SECURITY_INIT \ 387 .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \ 388 VMLINUX_SYMBOL(__security_initcall_start) = .; \ 389 *(.security_initcall.init) \ 390 VMLINUX_SYMBOL(__security_initcall_end) = .; \ 391 } 392 393 /* .text section. Map to function alignment to avoid address changes 394 * during second ld run in second ld pass when generating System.map */ 395 #define TEXT_TEXT \ 396 ALIGN_FUNCTION(); \ 397 *(.text.hot) \ 398 *(.text) \ 399 *(.ref.text) \ 400 MEM_KEEP(init.text) \ 401 MEM_KEEP(exit.text) \ 402 *(.text.unlikely) 403 404 405 /* sched.text is aling to function alignment to secure we have same 406 * address even at second ld pass when generating System.map */ 407 #define SCHED_TEXT \ 408 ALIGN_FUNCTION(); \ 409 VMLINUX_SYMBOL(__sched_text_start) = .; \ 410 *(.sched.text) \ 411 VMLINUX_SYMBOL(__sched_text_end) = .; 412 413 /* spinlock.text is aling to function alignment to secure we have same 414 * address even at second ld pass when generating System.map */ 415 #define LOCK_TEXT \ 416 ALIGN_FUNCTION(); \ 417 VMLINUX_SYMBOL(__lock_text_start) = .; \ 418 *(.spinlock.text) \ 419 VMLINUX_SYMBOL(__lock_text_end) = .; 420 421 #define KPROBES_TEXT \ 422 ALIGN_FUNCTION(); \ 423 VMLINUX_SYMBOL(__kprobes_text_start) = .; \ 424 *(.kprobes.text) \ 425 VMLINUX_SYMBOL(__kprobes_text_end) = .; 426 427 #define ENTRY_TEXT \ 428 ALIGN_FUNCTION(); \ 429 VMLINUX_SYMBOL(__entry_text_start) = .; \ 430 *(.entry.text) \ 431 VMLINUX_SYMBOL(__entry_text_end) = .; 432 433 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 434 #define IRQENTRY_TEXT \ 435 ALIGN_FUNCTION(); \ 436 VMLINUX_SYMBOL(__irqentry_text_start) = .; \ 437 *(.irqentry.text) \ 438 VMLINUX_SYMBOL(__irqentry_text_end) = .; 439 #else 440 #define IRQENTRY_TEXT 441 #endif 442 443 /* Section used for early init (in .S files) */ 444 #define HEAD_TEXT *(.head.text) 445 446 #define HEAD_TEXT_SECTION \ 447 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \ 448 HEAD_TEXT \ 449 } 450 451 /* 452 * Exception table 453 */ 454 #define EXCEPTION_TABLE(align) \ 455 . = ALIGN(align); \ 456 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \ 457 VMLINUX_SYMBOL(__start___ex_table) = .; \ 458 *(__ex_table) \ 459 VMLINUX_SYMBOL(__stop___ex_table) = .; \ 460 } 461 462 /* 463 * Init task 464 */ 465 #define INIT_TASK_DATA_SECTION(align) \ 466 . = ALIGN(align); \ 467 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \ 468 INIT_TASK_DATA(align) \ 469 } 470 471 #ifdef CONFIG_CONSTRUCTORS 472 #define KERNEL_CTORS() . = ALIGN(8); \ 473 VMLINUX_SYMBOL(__ctors_start) = .; \ 474 *(.ctors) \ 475 *(.init_array) \ 476 VMLINUX_SYMBOL(__ctors_end) = .; 477 #else 478 #define KERNEL_CTORS() 479 #endif 480 481 /* init and exit section handling */ 482 #define INIT_DATA \ 483 *(.init.data) \ 484 MEM_DISCARD(init.data) \ 485 KERNEL_CTORS() \ 486 MCOUNT_REC() \ 487 *(.init.rodata) \ 488 FTRACE_EVENTS() \ 489 TRACE_SYSCALLS() \ 490 KPROBE_BLACKLIST() \ 491 MEM_DISCARD(init.rodata) \ 492 CLK_OF_TABLES() \ 493 RESERVEDMEM_OF_TABLES() \ 494 CLKSRC_OF_TABLES() \ 495 CPU_METHOD_OF_TABLES() \ 496 KERNEL_DTB() \ 497 IRQCHIP_OF_MATCH_TABLE() \ 498 EARLYCON_OF_TABLES() 499 500 #define INIT_TEXT \ 501 *(.init.text) \ 502 MEM_DISCARD(init.text) 503 504 #define EXIT_DATA \ 505 *(.exit.data) \ 506 MEM_DISCARD(exit.data) \ 507 MEM_DISCARD(exit.rodata) 508 509 #define EXIT_TEXT \ 510 *(.exit.text) \ 511 MEM_DISCARD(exit.text) 512 513 #define EXIT_CALL \ 514 *(.exitcall.exit) 515 516 /* 517 * bss (Block Started by Symbol) - uninitialized data 518 * zeroed during startup 519 */ 520 #define SBSS(sbss_align) \ 521 . = ALIGN(sbss_align); \ 522 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \ 523 *(.sbss) \ 524 *(.scommon) \ 525 } 526 527 /* 528 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra 529 * sections to the front of bss. 530 */ 531 #ifndef BSS_FIRST_SECTIONS 532 #define BSS_FIRST_SECTIONS 533 #endif 534 535 #define BSS(bss_align) \ 536 . = ALIGN(bss_align); \ 537 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \ 538 BSS_FIRST_SECTIONS \ 539 *(.bss..page_aligned) \ 540 *(.dynbss) \ 541 *(.bss) \ 542 *(COMMON) \ 543 } 544 545 /* 546 * DWARF debug sections. 547 * Symbols in the DWARF debugging sections are relative to 548 * the beginning of the section so we begin them at 0. 549 */ 550 #define DWARF_DEBUG \ 551 /* DWARF 1 */ \ 552 .debug 0 : { *(.debug) } \ 553 .line 0 : { *(.line) } \ 554 /* GNU DWARF 1 extensions */ \ 555 .debug_srcinfo 0 : { *(.debug_srcinfo) } \ 556 .debug_sfnames 0 : { *(.debug_sfnames) } \ 557 /* DWARF 1.1 and DWARF 2 */ \ 558 .debug_aranges 0 : { *(.debug_aranges) } \ 559 .debug_pubnames 0 : { *(.debug_pubnames) } \ 560 /* DWARF 2 */ \ 561 .debug_info 0 : { *(.debug_info \ 562 .gnu.linkonce.wi.*) } \ 563 .debug_abbrev 0 : { *(.debug_abbrev) } \ 564 .debug_line 0 : { *(.debug_line) } \ 565 .debug_frame 0 : { *(.debug_frame) } \ 566 .debug_str 0 : { *(.debug_str) } \ 567 .debug_loc 0 : { *(.debug_loc) } \ 568 .debug_macinfo 0 : { *(.debug_macinfo) } \ 569 /* SGI/MIPS DWARF 2 extensions */ \ 570 .debug_weaknames 0 : { *(.debug_weaknames) } \ 571 .debug_funcnames 0 : { *(.debug_funcnames) } \ 572 .debug_typenames 0 : { *(.debug_typenames) } \ 573 .debug_varnames 0 : { *(.debug_varnames) } \ 574 575 /* Stabs debugging sections. */ 576 #define STABS_DEBUG \ 577 .stab 0 : { *(.stab) } \ 578 .stabstr 0 : { *(.stabstr) } \ 579 .stab.excl 0 : { *(.stab.excl) } \ 580 .stab.exclstr 0 : { *(.stab.exclstr) } \ 581 .stab.index 0 : { *(.stab.index) } \ 582 .stab.indexstr 0 : { *(.stab.indexstr) } \ 583 .comment 0 : { *(.comment) } 584 585 #ifdef CONFIG_GENERIC_BUG 586 #define BUG_TABLE \ 587 . = ALIGN(8); \ 588 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \ 589 VMLINUX_SYMBOL(__start___bug_table) = .; \ 590 *(__bug_table) \ 591 VMLINUX_SYMBOL(__stop___bug_table) = .; \ 592 } 593 #else 594 #define BUG_TABLE 595 #endif 596 597 #ifdef CONFIG_PM_TRACE 598 #define TRACEDATA \ 599 . = ALIGN(4); \ 600 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \ 601 VMLINUX_SYMBOL(__tracedata_start) = .; \ 602 *(.tracedata) \ 603 VMLINUX_SYMBOL(__tracedata_end) = .; \ 604 } 605 #else 606 #define TRACEDATA 607 #endif 608 609 #define NOTES \ 610 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ 611 VMLINUX_SYMBOL(__start_notes) = .; \ 612 *(.note.*) \ 613 VMLINUX_SYMBOL(__stop_notes) = .; \ 614 } 615 616 #define INIT_SETUP(initsetup_align) \ 617 . = ALIGN(initsetup_align); \ 618 VMLINUX_SYMBOL(__setup_start) = .; \ 619 *(.init.setup) \ 620 VMLINUX_SYMBOL(__setup_end) = .; 621 622 #define INIT_CALLS_LEVEL(level) \ 623 VMLINUX_SYMBOL(__initcall##level##_start) = .; \ 624 *(.initcall##level##.init) \ 625 *(.initcall##level##s.init) \ 626 627 #define INIT_CALLS \ 628 VMLINUX_SYMBOL(__initcall_start) = .; \ 629 *(.initcallearly.init) \ 630 INIT_CALLS_LEVEL(0) \ 631 INIT_CALLS_LEVEL(1) \ 632 INIT_CALLS_LEVEL(2) \ 633 INIT_CALLS_LEVEL(3) \ 634 INIT_CALLS_LEVEL(4) \ 635 INIT_CALLS_LEVEL(5) \ 636 INIT_CALLS_LEVEL(rootfs) \ 637 INIT_CALLS_LEVEL(6) \ 638 INIT_CALLS_LEVEL(7) \ 639 VMLINUX_SYMBOL(__initcall_end) = .; 640 641 #define CON_INITCALL \ 642 VMLINUX_SYMBOL(__con_initcall_start) = .; \ 643 *(.con_initcall.init) \ 644 VMLINUX_SYMBOL(__con_initcall_end) = .; 645 646 #define SECURITY_INITCALL \ 647 VMLINUX_SYMBOL(__security_initcall_start) = .; \ 648 *(.security_initcall.init) \ 649 VMLINUX_SYMBOL(__security_initcall_end) = .; 650 651 #ifdef CONFIG_BLK_DEV_INITRD 652 #define INIT_RAM_FS \ 653 . = ALIGN(4); \ 654 VMLINUX_SYMBOL(__initramfs_start) = .; \ 655 *(.init.ramfs) \ 656 . = ALIGN(8); \ 657 *(.init.ramfs.info) 658 #else 659 #define INIT_RAM_FS 660 #endif 661 662 /* 663 * Default discarded sections. 664 * 665 * Some archs want to discard exit text/data at runtime rather than 666 * link time due to cross-section references such as alt instructions, 667 * bug table, eh_frame, etc. DISCARDS must be the last of output 668 * section definitions so that such archs put those in earlier section 669 * definitions. 670 */ 671 #define DISCARDS \ 672 /DISCARD/ : { \ 673 EXIT_TEXT \ 674 EXIT_DATA \ 675 EXIT_CALL \ 676 *(.discard) \ 677 *(.discard.*) \ 678 } 679 680 /** 681 * PERCPU_INPUT - the percpu input sections 682 * @cacheline: cacheline size 683 * 684 * The core percpu section names and core symbols which do not rely 685 * directly upon load addresses. 686 * 687 * @cacheline is used to align subsections to avoid false cacheline 688 * sharing between subsections for different purposes. 689 */ 690 #define PERCPU_INPUT(cacheline) \ 691 VMLINUX_SYMBOL(__per_cpu_start) = .; \ 692 *(.data..percpu..first) \ 693 . = ALIGN(PAGE_SIZE); \ 694 *(.data..percpu..page_aligned) \ 695 . = ALIGN(cacheline); \ 696 *(.data..percpu..readmostly) \ 697 . = ALIGN(cacheline); \ 698 *(.data..percpu) \ 699 *(.data..percpu..shared_aligned) \ 700 VMLINUX_SYMBOL(__per_cpu_end) = .; 701 702 /** 703 * PERCPU_VADDR - define output section for percpu area 704 * @cacheline: cacheline size 705 * @vaddr: explicit base address (optional) 706 * @phdr: destination PHDR (optional) 707 * 708 * Macro which expands to output section for percpu area. 709 * 710 * @cacheline is used to align subsections to avoid false cacheline 711 * sharing between subsections for different purposes. 712 * 713 * If @vaddr is not blank, it specifies explicit base address and all 714 * percpu symbols will be offset from the given address. If blank, 715 * @vaddr always equals @laddr + LOAD_OFFSET. 716 * 717 * @phdr defines the output PHDR to use if not blank. Be warned that 718 * output PHDR is sticky. If @phdr is specified, the next output 719 * section in the linker script will go there too. @phdr should have 720 * a leading colon. 721 * 722 * Note that this macros defines __per_cpu_load as an absolute symbol. 723 * If there is no need to put the percpu section at a predetermined 724 * address, use PERCPU_SECTION. 725 */ 726 #define PERCPU_VADDR(cacheline, vaddr, phdr) \ 727 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 728 .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load) \ 729 - LOAD_OFFSET) { \ 730 PERCPU_INPUT(cacheline) \ 731 } phdr \ 732 . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu); 733 734 /** 735 * PERCPU_SECTION - define output section for percpu area, simple version 736 * @cacheline: cacheline size 737 * 738 * Align to PAGE_SIZE and outputs output section for percpu area. This 739 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and 740 * __per_cpu_start will be identical. 741 * 742 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,) 743 * except that __per_cpu_load is defined as a relative symbol against 744 * .data..percpu which is required for relocatable x86_32 configuration. 745 */ 746 #define PERCPU_SECTION(cacheline) \ 747 . = ALIGN(PAGE_SIZE); \ 748 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \ 749 VMLINUX_SYMBOL(__per_cpu_load) = .; \ 750 PERCPU_INPUT(cacheline) \ 751 } 752 753 754 /* 755 * Definition of the high level *_SECTION macros 756 * They will fit only a subset of the architectures 757 */ 758 759 760 /* 761 * Writeable data. 762 * All sections are combined in a single .data section. 763 * The sections following CONSTRUCTORS are arranged so their 764 * typical alignment matches. 765 * A cacheline is typical/always less than a PAGE_SIZE so 766 * the sections that has this restriction (or similar) 767 * is located before the ones requiring PAGE_SIZE alignment. 768 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which 769 * matches the requirement of PAGE_ALIGNED_DATA. 770 * 771 * use 0 as page_align if page_aligned data is not used */ 772 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \ 773 . = ALIGN(PAGE_SIZE); \ 774 .data : AT(ADDR(.data) - LOAD_OFFSET) { \ 775 INIT_TASK_DATA(inittask) \ 776 NOSAVE_DATA \ 777 PAGE_ALIGNED_DATA(pagealigned) \ 778 CACHELINE_ALIGNED_DATA(cacheline) \ 779 READ_MOSTLY_DATA(cacheline) \ 780 DATA_DATA \ 781 CONSTRUCTORS \ 782 } 783 784 #define INIT_TEXT_SECTION(inittext_align) \ 785 . = ALIGN(inittext_align); \ 786 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \ 787 VMLINUX_SYMBOL(_sinittext) = .; \ 788 INIT_TEXT \ 789 VMLINUX_SYMBOL(_einittext) = .; \ 790 } 791 792 #define INIT_DATA_SECTION(initsetup_align) \ 793 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \ 794 INIT_DATA \ 795 INIT_SETUP(initsetup_align) \ 796 INIT_CALLS \ 797 CON_INITCALL \ 798 SECURITY_INITCALL \ 799 INIT_RAM_FS \ 800 } 801 802 #define BSS_SECTION(sbss_align, bss_align, stop_align) \ 803 . = ALIGN(sbss_align); \ 804 VMLINUX_SYMBOL(__bss_start) = .; \ 805 SBSS(sbss_align) \ 806 BSS(bss_align) \ 807 . = ALIGN(stop_align); \ 808 VMLINUX_SYMBOL(__bss_stop) = .; 809