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