include/asm-generic/vmlinux.lds.h

   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(PAGE_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 #ifndef SYMBOL_PREFIX
  56 #define VMLINUX_SYMBOL(sym) sym
  57 #else
  58 #define PASTE2(x,y) x##y
  59 #define PASTE(x,y) PASTE2(x,y)
  60 #define VMLINUX_SYMBOL(sym) PASTE(SYMBOL_PREFIX, sym)
  61 #endif
  62
  63 /* Align . to a 8 byte boundary equals to maximum function alignment. */
  64 #define ALIGN_FUNCTION()  . = ALIGN(8)
  65
  66 /*
  67  * Align to a 32 byte boundary equal to the
  68  * alignment gcc 4.5 uses for a struct
  69  */
  70 #define STRUCT_ALIGN() . = ALIGN(32)
  71
  72 /* The actual configuration determine if the init/exit sections
  73  * are handled as text/data or they can be discarded (which
  74  * often happens at runtime)
  75  */
  76 #ifdef CONFIG_HOTPLUG
  77 #define DEV_KEEP(sec)    *(.dev##sec)
  78 #define DEV_DISCARD(sec)
  79 #else
  80 #define DEV_KEEP(sec)
  81 #define DEV_DISCARD(sec) *(.dev##sec)
  82 #endif
  83
  84 #ifdef CONFIG_HOTPLUG_CPU
  85 #define CPU_KEEP(sec)    *(.cpu##sec)
  86 #define CPU_DISCARD(sec)
  87 #else
  88 #define CPU_KEEP(sec)
  89 #define CPU_DISCARD(sec) *(.cpu##sec)
  90 #endif
  91
  92 #if defined(CONFIG_MEMORY_HOTPLUG)
  93 #define MEM_KEEP(sec)    *(.mem##sec)
  94 #define MEM_DISCARD(sec)
  95 #else
  96 #define MEM_KEEP(sec)
  97 #define MEM_DISCARD(sec) *(.mem##sec)
  98 #endif
  99
 100 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
 101 #define MCOUNT_REC()    . = ALIGN(8);                           \
 102                         VMLINUX_SYMBOL(__start_mcount_loc) = .; \
 103                         *(__mcount_loc)                         \
 104                         VMLINUX_SYMBOL(__stop_mcount_loc) = .;
 105 #else
 106 #define MCOUNT_REC()
 107 #endif
 108
 109 #ifdef CONFIG_TRACE_BRANCH_PROFILING
 110 #define LIKELY_PROFILE()        VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \
 111                                 *(_ftrace_annotated_branch)                           \
 112                                 VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .;
 113 #else
 114 #define LIKELY_PROFILE()
 115 #endif
 116
 117 #ifdef CONFIG_PROFILE_ALL_BRANCHES
 118 #define BRANCH_PROFILE()        VMLINUX_SYMBOL(__start_branch_profile) = .;   \
 119                                 *(_ftrace_branch)                             \
 120                                 VMLINUX_SYMBOL(__stop_branch_profile) = .;
 121 #else
 122 #define BRANCH_PROFILE()
 123 #endif
 124
 125 #ifdef CONFIG_EVENT_TRACING
 126 #define FTRACE_EVENTS() VMLINUX_SYMBOL(__start_ftrace_events) = .;      \
 127                         *(_ftrace_events)                               \
 128                         VMLINUX_SYMBOL(__stop_ftrace_events) = .;
 129 #else
 130 #define FTRACE_EVENTS()
 131 #endif
 132
 133 #ifdef CONFIG_TRACING
 134 #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .;      \
 135                          *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \
 136                          VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;
 137 #else
 138 #define TRACE_PRINTKS()
 139 #endif
 140
 141 #ifdef CONFIG_FTRACE_SYSCALLS
 142 #define TRACE_SYSCALLS() VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \
 143                          *(__syscalls_metadata)                         \
 144                          VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
 145 #else
 146 #define TRACE_SYSCALLS()
 147 #endif
 148
 149 /* .data section */
 150 #define DATA_DATA                                                       \
 151         *(.data)                                                        \
 152         *(.ref.data)                                                    \
 153         DEV_KEEP(init.data)                                             \
 154         DEV_KEEP(exit.data)                                             \
 155         CPU_KEEP(init.data)                                             \
 156         CPU_KEEP(exit.data)                                             \
 157         MEM_KEEP(init.data)                                             \
 158         MEM_KEEP(exit.data)                                             \
 159         . = ALIGN(8);                                                   \
 160         VMLINUX_SYMBOL(__start___markers) = .;                          \
 161         *(__markers)                                                    \
 162         VMLINUX_SYMBOL(__stop___markers) = .;                           \
 163         . = ALIGN(32);                                                  \
 164         VMLINUX_SYMBOL(__start___tracepoints) = .;                      \
 165         *(__tracepoints)                                                \
 166         VMLINUX_SYMBOL(__stop___tracepoints) = .;                       \
 167         /* implement dynamic printk debug */                            \
 168         . = ALIGN(8);                                                   \
 169         VMLINUX_SYMBOL(__start___verbose) = .;                          \
 170         *(__verbose)                                                    \
 171         VMLINUX_SYMBOL(__stop___verbose) = .;                           \
 172         LIKELY_PROFILE()                                                \
 173         BRANCH_PROFILE()                                                \
 174         TRACE_PRINTKS()                                                 \
 175                                                                         \
 176         STRUCT_ALIGN();                                                 \
 177         FTRACE_EVENTS()                                                 \
 178                                                                         \
 179         STRUCT_ALIGN();                                                 \
 180         TRACE_SYSCALLS()
 181
 182 /*
 183  * Data section helpers
 184  */
 185 #define NOSAVE_DATA                                                     \
 186         . = ALIGN(PAGE_SIZE);                                           \
 187         VMLINUX_SYMBOL(__nosave_begin) = .;                             \
 188         *(.data..nosave)                                                \
 189         . = ALIGN(PAGE_SIZE);                                           \
 190         VMLINUX_SYMBOL(__nosave_end) = .;
 191
 192 #define PAGE_ALIGNED_DATA(page_align)                                   \
 193         . = ALIGN(page_align);                                          \
 194         *(.data..page_aligned)
 195
 196 #define READ_MOSTLY_DATA(align)                                         \
 197         . = ALIGN(align);                                               \
 198         *(.data..read_mostly)
 199
 200 #define CACHELINE_ALIGNED_DATA(align)                                   \
 201         . = ALIGN(align);                                               \
 202         *(.data..cacheline_aligned)
 203
 204 #define INIT_TASK_DATA(align)                                           \
 205         . = ALIGN(align);                                               \
 206         *(.data..init_task)
 207
 208 /*
 209  * Read only Data
 210  */
 211 #define RO_DATA_SECTION(align)                                          \
 212         . = ALIGN((align));                                             \
 213         .rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {           \
 214                 VMLINUX_SYMBOL(__start_rodata) = .;                     \
 215                 *(.rodata) *(.rodata.*)                                 \
 216                 *(__vermagic)           /* Kernel version magic */      \
 217                 *(__markers_strings)    /* Markers: strings */          \
 218                 *(__tracepoints_strings)/* Tracepoints: strings */      \
 219         }                                                               \
 220                                                                         \
 221         .rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {          \
 222                 *(.rodata1)                                             \
 223         }                                                               \
 224                                                                         \
 225         BUG_TABLE                                                       \
 226                                                                         \
 227         /* PCI quirks */                                                \
 228         .pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {        \
 229                 VMLINUX_SYMBOL(__start_pci_fixups_early) = .;           \
 230                 *(.pci_fixup_early)                                     \
 231                 VMLINUX_SYMBOL(__end_pci_fixups_early) = .;             \
 232                 VMLINUX_SYMBOL(__start_pci_fixups_header) = .;          \
 233                 *(.pci_fixup_header)                                    \
 234                 VMLINUX_SYMBOL(__end_pci_fixups_header) = .;            \
 235                 VMLINUX_SYMBOL(__start_pci_fixups_final) = .;           \
 236                 *(.pci_fixup_final)                                     \
 237                 VMLINUX_SYMBOL(__end_pci_fixups_final) = .;             \
 238                 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .;          \
 239                 *(.pci_fixup_enable)                                    \
 240                 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .;            \
 241                 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .;          \
 242                 *(.pci_fixup_resume)                                    \
 243                 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .;            \
 244                 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .;    \
 245                 *(.pci_fixup_resume_early)                              \
 246                 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .;      \
 247                 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .;         \
 248                 *(.pci_fixup_suspend)                                   \
 249                 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .;           \
 250         }                                                               \
 251                                                                         \
 252         /* Built-in firmware blobs */                                   \
 253         .builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {      \
 254                 VMLINUX_SYMBOL(__start_builtin_fw) = .;                 \
 255                 *(.builtin_fw)                                          \
 256                 VMLINUX_SYMBOL(__end_builtin_fw) = .;                   \
 257         }                                                               \
 258                                                                         \
 259         /* RapidIO route ops */                                         \
 260         .rio_ops        : AT(ADDR(.rio_ops) - LOAD_OFFSET) {            \
 261                 VMLINUX_SYMBOL(__start_rio_switch_ops) = .;             \
 262                 *(.rio_switch_ops)                                      \
 263                 VMLINUX_SYMBOL(__end_rio_switch_ops) = .;               \
 264         }                                                               \
 265                                                                         \
 266         TRACEDATA                                                       \
 267                                                                         \
 268         /* Kernel symbol table: Normal symbols */                       \
 269         __ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {         \
 270                 VMLINUX_SYMBOL(__start___ksymtab) = .;                  \
 271                 *(__ksymtab)                                            \
 272                 VMLINUX_SYMBOL(__stop___ksymtab) = .;                   \
 273         }                                                               \
 274                                                                         \
 275         /* Kernel symbol table: GPL-only symbols */                     \
 276         __ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {     \
 277                 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .;              \
 278                 *(__ksymtab_gpl)                                        \
 279                 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .;               \
 280         }                                                               \
 281                                                                         \
 282         /* Kernel symbol table: Normal unused symbols */                \
 283         __ksymtab_unused  : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) {  \
 284                 VMLINUX_SYMBOL(__start___ksymtab_unused) = .;           \
 285                 *(__ksymtab_unused)                                     \
 286                 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .;            \
 287         }                                                               \
 288                                                                         \
 289         /* Kernel symbol table: GPL-only unused symbols */              \
 290         __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
 291                 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .;       \
 292                 *(__ksymtab_unused_gpl)                                 \
 293                 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .;        \
 294         }                                                               \
 295                                                                         \
 296         /* Kernel symbol table: GPL-future-only symbols */              \
 297         __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
 298                 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .;       \
 299                 *(__ksymtab_gpl_future)                                 \
 300                 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .;        \
 301         }                                                               \
 302                                                                         \
 303         /* Kernel symbol table: Normal symbols */                       \
 304         __kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {         \
 305                 VMLINUX_SYMBOL(__start___kcrctab) = .;                  \
 306                 *(__kcrctab)                                            \
 307                 VMLINUX_SYMBOL(__stop___kcrctab) = .;                   \
 308         }                                                               \
 309                                                                         \
 310         /* Kernel symbol table: GPL-only symbols */                     \
 311         __kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {     \
 312                 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .;              \
 313                 *(__kcrctab_gpl)                                        \
 314                 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .;               \
 315         }                                                               \
 316                                                                         \
 317         /* Kernel symbol table: Normal unused symbols */                \
 318         __kcrctab_unused  : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) {  \
 319                 VMLINUX_SYMBOL(__start___kcrctab_unused) = .;           \
 320                 *(__kcrctab_unused)                                     \
 321                 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .;            \
 322         }                                                               \
 323                                                                         \
 324         /* Kernel symbol table: GPL-only unused symbols */              \
 325         __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
 326                 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .;       \
 327                 *(__kcrctab_unused_gpl)                                 \
 328                 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .;        \
 329         }                                                               \
 330                                                                         \
 331         /* Kernel symbol table: GPL-future-only symbols */              \
 332         __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
 333                 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .;       \
 334                 *(__kcrctab_gpl_future)                                 \
 335                 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .;        \
 336         }                                                               \
 337                                                                         \
 338         /* Kernel symbol table: strings */                              \
 339         __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
 340                 *(__ksymtab_strings)                                    \
 341         }                                                               \
 342                                                                         \
 343         /* __*init sections */                                          \
 344         __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {         \
 345                 *(.ref.rodata)                                          \
 346                 DEV_KEEP(init.rodata)                                   \
 347                 DEV_KEEP(exit.rodata)                                   \
 348                 CPU_KEEP(init.rodata)                                   \
 349                 CPU_KEEP(exit.rodata)                                   \
 350                 MEM_KEEP(init.rodata)                                   \
 351                 MEM_KEEP(exit.rodata)                                   \
 352         }                                                               \
 353                                                                         \
 354         /* Built-in module parameters. */                               \
 355         __param : AT(ADDR(__param) - LOAD_OFFSET) {                     \
 356                 VMLINUX_SYMBOL(__start___param) = .;                    \
 357                 *(__param)                                              \
 358                 VMLINUX_SYMBOL(__stop___param) = .;                     \
 359                 . = ALIGN((align));                                     \
 360                 VMLINUX_SYMBOL(__end_rodata) = .;                       \
 361         }                                                               \
 362         . = ALIGN((align));
 363
 364 /* RODATA & RO_DATA provided for backward compatibility.
 365  * All archs are supposed to use RO_DATA() */
 366 #define RODATA          RO_DATA_SECTION(4096)
 367 #define RO_DATA(align)  RO_DATA_SECTION(align)
 368
 369 #define SECURITY_INIT                                                   \
 370         .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
 371                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 372                 *(.security_initcall.init)                              \
 373                 VMLINUX_SYMBOL(__security_initcall_end) = .;            \
 374         }
 375
 376 /* .text section. Map to function alignment to avoid address changes
 377  * during second ld run in second ld pass when generating System.map */
 378 #define TEXT_TEXT                                                       \
 379                 ALIGN_FUNCTION();                                       \
 380                 *(.text.hot)                                            \
 381                 *(.text)                                                \
 382                 *(.ref.text)                                            \
 383         DEV_KEEP(init.text)                                             \
 384         DEV_KEEP(exit.text)                                             \
 385         CPU_KEEP(init.text)                                             \
 386         CPU_KEEP(exit.text)                                             \
 387         MEM_KEEP(init.text)                                             \
 388         MEM_KEEP(exit.text)                                             \
 389                 *(.text.unlikely)
 390
 391
 392 /* sched.text is aling to function alignment to secure we have same
 393  * address even at second ld pass when generating System.map */
 394 #define SCHED_TEXT                                                      \
 395                 ALIGN_FUNCTION();                                       \
 396                 VMLINUX_SYMBOL(__sched_text_start) = .;                 \
 397                 *(.sched.text)                                          \
 398                 VMLINUX_SYMBOL(__sched_text_end) = .;
 399
 400 /* spinlock.text is aling to function alignment to secure we have same
 401  * address even at second ld pass when generating System.map */
 402 #define LOCK_TEXT                                                       \
 403                 ALIGN_FUNCTION();                                       \
 404                 VMLINUX_SYMBOL(__lock_text_start) = .;                  \
 405                 *(.spinlock.text)                                       \
 406                 VMLINUX_SYMBOL(__lock_text_end) = .;
 407
 408 #define KPROBES_TEXT                                                    \
 409                 ALIGN_FUNCTION();                                       \
 410                 VMLINUX_SYMBOL(__kprobes_text_start) = .;               \
 411                 *(.kprobes.text)                                        \
 412                 VMLINUX_SYMBOL(__kprobes_text_end) = .;
 413
 414 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 415 #define IRQENTRY_TEXT                                                   \
 416                 ALIGN_FUNCTION();                                       \
 417                 VMLINUX_SYMBOL(__irqentry_text_start) = .;              \
 418                 *(.irqentry.text)                                       \
 419                 VMLINUX_SYMBOL(__irqentry_text_end) = .;
 420 #else
 421 #define IRQENTRY_TEXT
 422 #endif
 423
 424 /* Section used for early init (in .S files) */
 425 #define HEAD_TEXT  *(.head.text)
 426
 427 #define HEAD_TEXT_SECTION                                                       \
 428         .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {               \
 429                 HEAD_TEXT                                               \
 430         }
 431
 432 /*
 433  * Exception table
 434  */
 435 #define EXCEPTION_TABLE(align)                                          \
 436         . = ALIGN(align);                                               \
 437         __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {               \
 438                 VMLINUX_SYMBOL(__start___ex_table) = .;                 \
 439                 *(__ex_table)                                           \
 440                 VMLINUX_SYMBOL(__stop___ex_table) = .;                  \
 441         }
 442
 443 /*
 444  * Init task
 445  */
 446 #define INIT_TASK_DATA_SECTION(align)                                   \
 447         . = ALIGN(align);                                               \
 448         .data..init_task :  AT(ADDR(.data..init_task) - LOAD_OFFSET) {  \
 449                 INIT_TASK_DATA(align)                                   \
 450         }
 451
 452 #ifdef CONFIG_CONSTRUCTORS
 453 #define KERNEL_CTORS()  . = ALIGN(8);                      \
 454                         VMLINUX_SYMBOL(__ctors_start) = .; \
 455                         *(.ctors)                          \
 456                         VMLINUX_SYMBOL(__ctors_end) = .;
 457 #else
 458 #define KERNEL_CTORS()
 459 #endif
 460
 461 /* init and exit section handling */
 462 #define INIT_DATA                                                       \
 463         *(.init.data)                                                   \
 464         DEV_DISCARD(init.data)                                          \
 465         CPU_DISCARD(init.data)                                          \
 466         MEM_DISCARD(init.data)                                          \
 467         KERNEL_CTORS()                                                  \
 468         *(.init.rodata)                                                 \
 469         MCOUNT_REC()                                                    \
 470         DEV_DISCARD(init.rodata)                                        \
 471         CPU_DISCARD(init.rodata)                                        \
 472         MEM_DISCARD(init.rodata)
 473
 474 #define INIT_TEXT                                                       \
 475         *(.init.text)                                                   \
 476         DEV_DISCARD(init.text)                                          \
 477         CPU_DISCARD(init.text)                                          \
 478         MEM_DISCARD(init.text)
 479
 480 #define EXIT_DATA                                                       \
 481         *(.exit.data)                                                   \
 482         DEV_DISCARD(exit.data)                                          \
 483         DEV_DISCARD(exit.rodata)                                        \
 484         CPU_DISCARD(exit.data)                                          \
 485         CPU_DISCARD(exit.rodata)                                        \
 486         MEM_DISCARD(exit.data)                                          \
 487         MEM_DISCARD(exit.rodata)
 488
 489 #define EXIT_TEXT                                                       \
 490         *(.exit.text)                                                   \
 491         DEV_DISCARD(exit.text)                                          \
 492         CPU_DISCARD(exit.text)                                          \
 493         MEM_DISCARD(exit.text)
 494
 495 #define EXIT_CALL                                                       \
 496         *(.exitcall.exit)
 497
 498 /*
 499  * bss (Block Started by Symbol) - uninitialized data
 500  * zeroed during startup
 501  */
 502 #define SBSS(sbss_align)                                                \
 503         . = ALIGN(sbss_align);                                          \
 504         .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {                         \
 505                 *(.sbss)                                                \
 506                 *(.scommon)                                             \
 507         }
 508
 509 #define BSS(bss_align)                                                  \
 510         . = ALIGN(bss_align);                                           \
 511         .bss : AT(ADDR(.bss) - LOAD_OFFSET) {                           \
 512                 *(.bss..page_aligned)                                   \
 513                 *(.dynbss)                                              \
 514                 *(.bss)                                                 \
 515                 *(COMMON)                                               \
 516         }
 517
 518 /*
 519  * DWARF debug sections.
 520  * Symbols in the DWARF debugging sections are relative to
 521  * the beginning of the section so we begin them at 0.
 522  */
 523 #define DWARF_DEBUG                                                     \
 524                 /* DWARF 1 */                                           \
 525                 .debug          0 : { *(.debug) }                       \
 526                 .line           0 : { *(.line) }                        \
 527                 /* GNU DWARF 1 extensions */                            \
 528                 .debug_srcinfo  0 : { *(.debug_srcinfo) }               \
 529                 .debug_sfnames  0 : { *(.debug_sfnames) }               \
 530                 /* DWARF 1.1 and DWARF 2 */                             \
 531                 .debug_aranges  0 : { *(.debug_aranges) }               \
 532                 .debug_pubnames 0 : { *(.debug_pubnames) }              \
 533                 /* DWARF 2 */                                           \
 534                 .debug_info     0 : { *(.debug_info                     \
 535                                 .gnu.linkonce.wi.*) }                   \
 536                 .debug_abbrev   0 : { *(.debug_abbrev) }                \
 537                 .debug_line     0 : { *(.debug_line) }                  \
 538                 .debug_frame    0 : { *(.debug_frame) }                 \
 539                 .debug_str      0 : { *(.debug_str) }                   \
 540                 .debug_loc      0 : { *(.debug_loc) }                   \
 541                 .debug_macinfo  0 : { *(.debug_macinfo) }               \
 542                 /* SGI/MIPS DWARF 2 extensions */                       \
 543                 .debug_weaknames 0 : { *(.debug_weaknames) }            \
 544                 .debug_funcnames 0 : { *(.debug_funcnames) }            \
 545                 .debug_typenames 0 : { *(.debug_typenames) }            \
 546                 .debug_varnames  0 : { *(.debug_varnames) }             \
 547
 548                 /* Stabs debugging sections.  */
 549 #define STABS_DEBUG                                                     \
 550                 .stab 0 : { *(.stab) }                                  \
 551                 .stabstr 0 : { *(.stabstr) }                            \
 552                 .stab.excl 0 : { *(.stab.excl) }                        \
 553                 .stab.exclstr 0 : { *(.stab.exclstr) }                  \
 554                 .stab.index 0 : { *(.stab.index) }                      \
 555                 .stab.indexstr 0 : { *(.stab.indexstr) }                \
 556                 .comment 0 : { *(.comment) }
 557
 558 #ifdef CONFIG_GENERIC_BUG
 559 #define BUG_TABLE                                                       \
 560         . = ALIGN(8);                                                   \
 561         __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {             \
 562                 VMLINUX_SYMBOL(__start___bug_table) = .;                \
 563                 *(__bug_table)                                          \
 564                 VMLINUX_SYMBOL(__stop___bug_table) = .;                 \
 565         }
 566 #else
 567 #define BUG_TABLE
 568 #endif
 569
 570 #ifdef CONFIG_PM_TRACE
 571 #define TRACEDATA                                                       \
 572         . = ALIGN(4);                                                   \
 573         .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {               \
 574                 VMLINUX_SYMBOL(__tracedata_start) = .;                  \
 575                 *(.tracedata)                                           \
 576                 VMLINUX_SYMBOL(__tracedata_end) = .;                    \
 577         }
 578 #else
 579 #define TRACEDATA
 580 #endif
 581
 582 #define NOTES                                                           \
 583         .notes : AT(ADDR(.notes) - LOAD_OFFSET) {                       \
 584                 VMLINUX_SYMBOL(__start_notes) = .;                      \
 585                 *(.note.*)                                              \
 586                 VMLINUX_SYMBOL(__stop_notes) = .;                       \
 587         }
 588
 589 #define INIT_SETUP(initsetup_align)                                     \
 590                 . = ALIGN(initsetup_align);                             \
 591                 VMLINUX_SYMBOL(__setup_start) = .;                      \
 592                 *(.init.setup)                                          \
 593                 VMLINUX_SYMBOL(__setup_end) = .;
 594
 595 #define INITCALLS                                                       \
 596         *(.initcallearly.init)                                          \
 597         VMLINUX_SYMBOL(__early_initcall_end) = .;                       \
 598         *(.initcall0.init)                                              \
 599         *(.initcall0s.init)                                             \
 600         *(.initcall1.init)                                              \
 601         *(.initcall1s.init)                                             \
 602         *(.initcall2.init)                                              \
 603         *(.initcall2s.init)                                             \
 604         *(.initcall3.init)                                              \
 605         *(.initcall3s.init)                                             \
 606         *(.initcall4.init)                                              \
 607         *(.initcall4s.init)                                             \
 608         *(.initcall5.init)                                              \
 609         *(.initcall5s.init)                                             \
 610         *(.initcallrootfs.init)                                         \
 611         *(.initcall6.init)                                              \
 612         *(.initcall6s.init)                                             \
 613         *(.initcall7.init)                                              \
 614         *(.initcall7s.init)
 615
 616 #define INIT_CALLS                                                      \
 617                 VMLINUX_SYMBOL(__initcall_start) = .;                   \
 618                 INITCALLS                                               \
 619                 VMLINUX_SYMBOL(__initcall_end) = .;
 620
 621 #define CON_INITCALL                                                    \
 622                 VMLINUX_SYMBOL(__con_initcall_start) = .;               \
 623                 *(.con_initcall.init)                                   \
 624                 VMLINUX_SYMBOL(__con_initcall_end) = .;
 625
 626 #define SECURITY_INITCALL                                               \
 627                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 628                 *(.security_initcall.init)                              \
 629                 VMLINUX_SYMBOL(__security_initcall_end) = .;
 630
 631 #ifdef CONFIG_BLK_DEV_INITRD
 632 #define INIT_RAM_FS                                                     \
 633         . = ALIGN(PAGE_SIZE);                                           \
 634         VMLINUX_SYMBOL(__initramfs_start) = .;                          \
 635         *(.init.ramfs)                                                  \
 636         VMLINUX_SYMBOL(__initramfs_end) = .;
 637 #else
 638 #define INIT_RAM_FS
 639 #endif
 640
 641 /*
 642  * Default discarded sections.
 643  *
 644  * Some archs want to discard exit text/data at runtime rather than
 645  * link time due to cross-section references such as alt instructions,
 646  * bug table, eh_frame, etc.  DISCARDS must be the last of output
 647  * section definitions so that such archs put those in earlier section
 648  * definitions.
 649  */
 650 #define DISCARDS                                                        \
 651         /DISCARD/ : {                                                   \
 652         EXIT_TEXT                                                       \
 653         EXIT_DATA                                                       \
 654         EXIT_CALL                                                       \
 655         *(.discard)                                                     \
 656         }
 657
 658 /**
 659  * PERCPU_VADDR - define output section for percpu area
 660  * @vaddr: explicit base address (optional)
 661  * @phdr: destination PHDR (optional)
 662  *
 663  * Macro which expands to output section for percpu area.  If @vaddr
 664  * is not blank, it specifies explicit base address and all percpu
 665  * symbols will be offset from the given address.  If blank, @vaddr
 666  * always equals @laddr + LOAD_OFFSET.
 667  *
 668  * @phdr defines the output PHDR to use if not blank.  Be warned that
 669  * output PHDR is sticky.  If @phdr is specified, the next output
 670  * section in the linker script will go there too.  @phdr should have
 671  * a leading colon.
 672  *
 673  * Note that this macros defines __per_cpu_load as an absolute symbol.
 674  * If there is no need to put the percpu section at a predetermined
 675  * address, use PERCPU().
 676  */
 677 #define PERCPU_VADDR(vaddr, phdr)                                       \
 678         VMLINUX_SYMBOL(__per_cpu_load) = .;                             \
 679         .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load)         \
 680                                 - LOAD_OFFSET) {                        \
 681                 VMLINUX_SYMBOL(__per_cpu_start) = .;                    \
 682                 *(.data..percpu..first)                                 \
 683                 *(.data..percpu..page_aligned)                          \
 684                 *(.data..percpu)                                        \
 685                 *(.data..percpu..shared_aligned)                        \
 686                 VMLINUX_SYMBOL(__per_cpu_end) = .;                      \
 687         } phdr                                                          \
 688         . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
 689
 690 /**
 691  * PERCPU - define output section for percpu area, simple version
 692  * @align: required alignment
 693  *
 694  * Align to @align and outputs output section for percpu area.  This
 695  * macro doesn't maniuplate @vaddr or @phdr and __per_cpu_load and
 696  * __per_cpu_start will be identical.
 697  *
 698  * This macro is equivalent to ALIGN(align); PERCPU_VADDR( , ) except
 699  * that __per_cpu_load is defined as a relative symbol against
 700  * .data..percpu which is required for relocatable x86_32
 701  * configuration.
 702  */
 703 #define PERCPU(align)                                                   \
 704         . = ALIGN(align);                                               \
 705         .data..percpu   : AT(ADDR(.data..percpu) - LOAD_OFFSET) {       \
 706                 VMLINUX_SYMBOL(__per_cpu_load) = .;                     \
 707                 VMLINUX_SYMBOL(__per_cpu_start) = .;                    \
 708                 *(.data..percpu..first)                                 \
 709                 *(.data..percpu..page_aligned)                          \
 710                 *(.data..percpu)                                        \
 711                 *(.data..percpu..shared_aligned)                        \
 712                 VMLINUX_SYMBOL(__per_cpu_end) = .;                      \
 713         }
 714
 715
 716 /*
 717  * Definition of the high level *_SECTION macros
 718  * They will fit only a subset of the architectures
 719  */
 720
 721
 722 /*
 723  * Writeable data.
 724  * All sections are combined in a single .data section.
 725  * The sections following CONSTRUCTORS are arranged so their
 726  * typical alignment matches.
 727  * A cacheline is typical/always less than a PAGE_SIZE so
 728  * the sections that has this restriction (or similar)
 729  * is located before the ones requiring PAGE_SIZE alignment.
 730  * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
 731  * matches the requirment of PAGE_ALIGNED_DATA.
 732  *
 733  * use 0 as page_align if page_aligned data is not used */
 734 #define RW_DATA_SECTION(cacheline, pagealigned, inittask)               \
 735         . = ALIGN(PAGE_SIZE);                                           \
 736         .data : AT(ADDR(.data) - LOAD_OFFSET) {                         \
 737                 INIT_TASK_DATA(inittask)                                \
 738                 NOSAVE_DATA                                             \
 739                 PAGE_ALIGNED_DATA(pagealigned)                          \
 740                 CACHELINE_ALIGNED_DATA(cacheline)                       \
 741                 READ_MOSTLY_DATA(cacheline)                             \
 742                 DATA_DATA                                               \
 743                 CONSTRUCTORS                                            \
 744         }
 745
 746 #define INIT_TEXT_SECTION(inittext_align)                               \
 747         . = ALIGN(inittext_align);                                      \
 748         .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {               \
 749                 VMLINUX_SYMBOL(_sinittext) = .;                         \
 750                 INIT_TEXT                                               \
 751                 VMLINUX_SYMBOL(_einittext) = .;                         \
 752         }
 753
 754 #define INIT_DATA_SECTION(initsetup_align)                              \
 755         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {               \
 756                 INIT_DATA                                               \
 757                 INIT_SETUP(initsetup_align)                             \
 758                 INIT_CALLS                                              \
 759                 CON_INITCALL                                            \
 760                 SECURITY_INITCALL                                       \
 761                 INIT_RAM_FS                                             \
 762         }
 763
 764 #define BSS_SECTION(sbss_align, bss_align, stop_align)                  \
 765         . = ALIGN(sbss_align);                                          \
 766         VMLINUX_SYMBOL(__bss_start) = .;                                \
 767         SBSS(sbss_align)                                                \
 768         BSS(bss_align)                                                  \
 769         . = ALIGN(stop_align);                                          \
 770         VMLINUX_SYMBOL(__bss_stop) = .;