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