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