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  *      /DISCARD/ : {
  37  *              EXIT_TEXT
  38  *              EXIT_DATA
  39  *              EXIT_CALL
  40  *      }
  41  *      STABS_DEBUG
  42  *      DWARF_DEBUG
  43  * }
  44  *
  45  * [__init_begin, __init_end] is the init section that may be freed after init
  46  * [_stext, _etext] is the text section
  47  * [_sdata, _edata] is the data section
  48  *
  49  * Some of the included output section have their own set of constants.
  50  * Examples are: [__initramfs_start, __initramfs_end] for initramfs and
  51  *               [__nosave_begin, __nosave_end] for the nosave data
  52  */
  53
  54 #ifndef LOAD_OFFSET
  55 #define LOAD_OFFSET 0
  56 #endif
  57
  58 #ifndef VMLINUX_SYMBOL
  59 #define VMLINUX_SYMBOL(_sym_) _sym_
  60 #endif
  61
  62 /* Align . to a 8 byte boundary equals to maximum function alignment. */
  63 #define ALIGN_FUNCTION()  . = ALIGN(8)
  64
  65 /* The actual configuration determine if the init/exit sections
  66  * are handled as text/data or they can be discarded (which
  67  * often happens at runtime)
  68  */
  69 #ifdef CONFIG_HOTPLUG
  70 #define DEV_KEEP(sec)    *(.dev##sec)
  71 #define DEV_DISCARD(sec)
  72 #else
  73 #define DEV_KEEP(sec)
  74 #define DEV_DISCARD(sec) *(.dev##sec)
  75 #endif
  76
  77 #ifdef CONFIG_HOTPLUG_CPU
  78 #define CPU_KEEP(sec)    *(.cpu##sec)
  79 #define CPU_DISCARD(sec)
  80 #else
  81 #define CPU_KEEP(sec)
  82 #define CPU_DISCARD(sec) *(.cpu##sec)
  83 #endif
  84
  85 #if defined(CONFIG_MEMORY_HOTPLUG)
  86 #define MEM_KEEP(sec)    *(.mem##sec)
  87 #define MEM_DISCARD(sec)
  88 #else
  89 #define MEM_KEEP(sec)
  90 #define MEM_DISCARD(sec) *(.mem##sec)
  91 #endif
  92
  93 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
  94 #define MCOUNT_REC()    . = ALIGN(8);                           \
  95                         VMLINUX_SYMBOL(__start_mcount_loc) = .; \
  96                         *(__mcount_loc)                         \
  97                         VMLINUX_SYMBOL(__stop_mcount_loc) = .;
  98 #else
  99 #define MCOUNT_REC()
 100 #endif
 101
 102 #ifdef CONFIG_TRACE_BRANCH_PROFILING
 103 #define LIKELY_PROFILE()        VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \
 104                                 *(_ftrace_annotated_branch)                           \
 105                                 VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .;
 106 #else
 107 #define LIKELY_PROFILE()
 108 #endif
 109
 110 #ifdef CONFIG_PROFILE_ALL_BRANCHES
 111 #define BRANCH_PROFILE()        VMLINUX_SYMBOL(__start_branch_profile) = .;   \
 112                                 *(_ftrace_branch)                             \
 113                                 VMLINUX_SYMBOL(__stop_branch_profile) = .;
 114 #else
 115 #define BRANCH_PROFILE()
 116 #endif
 117
 118 #ifdef CONFIG_EVENT_TRACING
 119 #define FTRACE_EVENTS() VMLINUX_SYMBOL(__start_ftrace_events) = .;      \
 120                         *(_ftrace_events)                               \
 121                         VMLINUX_SYMBOL(__stop_ftrace_events) = .;
 122 #else
 123 #define FTRACE_EVENTS()
 124 #endif
 125
 126 #ifdef CONFIG_TRACING
 127 #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .;      \
 128                          *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \
 129                          VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;
 130 #else
 131 #define TRACE_PRINTKS()
 132 #endif
 133
 134 #ifdef CONFIG_FTRACE_SYSCALLS
 135 #define TRACE_SYSCALLS() VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \
 136                          *(__syscalls_metadata)                         \
 137                          VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
 138 #else
 139 #define TRACE_SYSCALLS()
 140 #endif
 141
 142 /* .data section */
 143 #define DATA_DATA                                                       \
 144         *(.data)                                                        \
 145         *(.ref.data)                                                    \
 146         DEV_KEEP(init.data)                                             \
 147         DEV_KEEP(exit.data)                                             \
 148         CPU_KEEP(init.data)                                             \
 149         CPU_KEEP(exit.data)                                             \
 150         MEM_KEEP(init.data)                                             \
 151         MEM_KEEP(exit.data)                                             \
 152         . = ALIGN(8);                                                   \
 153         VMLINUX_SYMBOL(__start___markers) = .;                          \
 154         *(__markers)                                                    \
 155         VMLINUX_SYMBOL(__stop___markers) = .;                           \
 156         . = ALIGN(32);                                                  \
 157         VMLINUX_SYMBOL(__start___tracepoints) = .;                      \
 158         *(__tracepoints)                                                \
 159         VMLINUX_SYMBOL(__stop___tracepoints) = .;                       \
 160         /* implement dynamic printk debug */                            \
 161         . = ALIGN(8);                                                   \
 162         VMLINUX_SYMBOL(__start___verbose) = .;                          \
 163         *(__verbose)                                                    \
 164         VMLINUX_SYMBOL(__stop___verbose) = .;                           \
 165         LIKELY_PROFILE()                                                \
 166         BRANCH_PROFILE()                                                \
 167         TRACE_PRINTKS()                                                 \
 168         FTRACE_EVENTS()                                                 \
 169         TRACE_SYSCALLS()
 170
 171 /*
 172  * Data section helpers
 173  */
 174 #define NOSAVE_DATA                                                     \
 175         . = ALIGN(PAGE_SIZE);                                           \
 176         VMLINUX_SYMBOL(__nosave_begin) = .;                             \
 177         *(.data.nosave)                                                 \
 178         . = ALIGN(PAGE_SIZE);                                           \
 179         VMLINUX_SYMBOL(__nosave_end) = .;
 180
 181 #define PAGE_ALIGNED_DATA(page_align)                                   \
 182         . = ALIGN(page_align);                                          \
 183         *(.data.page_aligned)
 184
 185 #define READ_MOSTLY_DATA(align)                                         \
 186         . = ALIGN(align);                                               \
 187         *(.data.read_mostly)
 188
 189 #define CACHELINE_ALIGNED_DATA(align)                                   \
 190         . = ALIGN(align);                                               \
 191         *(.data.cacheline_aligned)
 192
 193 #define INIT_TASK_DATA(align)                                           \
 194         . = ALIGN(align);                                               \
 195         *(.data.init_task)
 196
 197 /*
 198  * Read only Data
 199  */
 200 #define RO_DATA_SECTION(align)                                          \
 201         . = ALIGN((align));                                             \
 202         .rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {           \
 203                 VMLINUX_SYMBOL(__start_rodata) = .;                     \
 204                 *(.rodata) *(.rodata.*)                                 \
 205                 *(__vermagic)           /* Kernel version magic */      \
 206                 *(__markers_strings)    /* Markers: strings */          \
 207                 *(__tracepoints_strings)/* Tracepoints: strings */      \
 208         }                                                               \
 209                                                                         \
 210         .rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {          \
 211                 *(.rodata1)                                             \
 212         }                                                               \
 213                                                                         \
 214         BUG_TABLE                                                       \
 215                                                                         \
 216         /* PCI quirks */                                                \
 217         .pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {        \
 218                 VMLINUX_SYMBOL(__start_pci_fixups_early) = .;           \
 219                 *(.pci_fixup_early)                                     \
 220                 VMLINUX_SYMBOL(__end_pci_fixups_early) = .;             \
 221                 VMLINUX_SYMBOL(__start_pci_fixups_header) = .;          \
 222                 *(.pci_fixup_header)                                    \
 223                 VMLINUX_SYMBOL(__end_pci_fixups_header) = .;            \
 224                 VMLINUX_SYMBOL(__start_pci_fixups_final) = .;           \
 225                 *(.pci_fixup_final)                                     \
 226                 VMLINUX_SYMBOL(__end_pci_fixups_final) = .;             \
 227                 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .;          \
 228                 *(.pci_fixup_enable)                                    \
 229                 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .;            \
 230                 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .;          \
 231                 *(.pci_fixup_resume)                                    \
 232                 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .;            \
 233                 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .;    \
 234                 *(.pci_fixup_resume_early)                              \
 235                 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .;      \
 236                 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .;         \
 237                 *(.pci_fixup_suspend)                                   \
 238                 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .;           \
 239         }                                                               \
 240                                                                         \
 241         /* Built-in firmware blobs */                                   \
 242         .builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {      \
 243                 VMLINUX_SYMBOL(__start_builtin_fw) = .;                 \
 244                 *(.builtin_fw)                                          \
 245                 VMLINUX_SYMBOL(__end_builtin_fw) = .;                   \
 246         }                                                               \
 247                                                                         \
 248         /* RapidIO route ops */                                         \
 249         .rio_route        : AT(ADDR(.rio_route) - LOAD_OFFSET) {        \
 250                 VMLINUX_SYMBOL(__start_rio_route_ops) = .;              \
 251                 *(.rio_route_ops)                                       \
 252                 VMLINUX_SYMBOL(__end_rio_route_ops) = .;                \
 253         }                                                               \
 254                                                                         \
 255         TRACEDATA                                                       \
 256                                                                         \
 257         /* Kernel symbol table: Normal symbols */                       \
 258         __ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {         \
 259                 VMLINUX_SYMBOL(__start___ksymtab) = .;                  \
 260                 *(__ksymtab)                                            \
 261                 VMLINUX_SYMBOL(__stop___ksymtab) = .;                   \
 262         }                                                               \
 263                                                                         \
 264         /* Kernel symbol table: GPL-only symbols */                     \
 265         __ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {     \
 266                 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .;              \
 267                 *(__ksymtab_gpl)                                        \
 268                 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .;               \
 269         }                                                               \
 270                                                                         \
 271         /* Kernel symbol table: Normal unused symbols */                \
 272         __ksymtab_unused  : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) {  \
 273                 VMLINUX_SYMBOL(__start___ksymtab_unused) = .;           \
 274                 *(__ksymtab_unused)                                     \
 275                 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .;            \
 276         }                                                               \
 277                                                                         \
 278         /* Kernel symbol table: GPL-only unused symbols */              \
 279         __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
 280                 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .;       \
 281                 *(__ksymtab_unused_gpl)                                 \
 282                 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .;        \
 283         }                                                               \
 284                                                                         \
 285         /* Kernel symbol table: GPL-future-only symbols */              \
 286         __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
 287                 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .;       \
 288                 *(__ksymtab_gpl_future)                                 \
 289                 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .;        \
 290         }                                                               \
 291                                                                         \
 292         /* Kernel symbol table: Normal symbols */                       \
 293         __kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {         \
 294                 VMLINUX_SYMBOL(__start___kcrctab) = .;                  \
 295                 *(__kcrctab)                                            \
 296                 VMLINUX_SYMBOL(__stop___kcrctab) = .;                   \
 297         }                                                               \
 298                                                                         \
 299         /* Kernel symbol table: GPL-only symbols */                     \
 300         __kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {     \
 301                 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .;              \
 302                 *(__kcrctab_gpl)                                        \
 303                 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .;               \
 304         }                                                               \
 305                                                                         \
 306         /* Kernel symbol table: Normal unused symbols */                \
 307         __kcrctab_unused  : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) {  \
 308                 VMLINUX_SYMBOL(__start___kcrctab_unused) = .;           \
 309                 *(__kcrctab_unused)                                     \
 310                 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .;            \
 311         }                                                               \
 312                                                                         \
 313         /* Kernel symbol table: GPL-only unused symbols */              \
 314         __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
 315                 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .;       \
 316                 *(__kcrctab_unused_gpl)                                 \
 317                 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .;        \
 318         }                                                               \
 319                                                                         \
 320         /* Kernel symbol table: GPL-future-only symbols */              \
 321         __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
 322                 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .;       \
 323                 *(__kcrctab_gpl_future)                                 \
 324                 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .;        \
 325         }                                                               \
 326                                                                         \
 327         /* Kernel symbol table: strings */                              \
 328         __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
 329                 *(__ksymtab_strings)                                    \
 330         }                                                               \
 331                                                                         \
 332         /* __*init sections */                                          \
 333         __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {         \
 334                 *(.ref.rodata)                                          \
 335                 DEV_KEEP(init.rodata)                                   \
 336                 DEV_KEEP(exit.rodata)                                   \
 337                 CPU_KEEP(init.rodata)                                   \
 338                 CPU_KEEP(exit.rodata)                                   \
 339                 MEM_KEEP(init.rodata)                                   \
 340                 MEM_KEEP(exit.rodata)                                   \
 341         }                                                               \
 342                                                                         \
 343         /* Built-in module parameters. */                               \
 344         __param : AT(ADDR(__param) - LOAD_OFFSET) {                     \
 345                 VMLINUX_SYMBOL(__start___param) = .;                    \
 346                 *(__param)                                              \
 347                 VMLINUX_SYMBOL(__stop___param) = .;                     \
 348                 . = ALIGN((align));                                     \
 349                 VMLINUX_SYMBOL(__end_rodata) = .;                       \
 350         }                                                               \
 351         . = ALIGN((align));
 352
 353 /* RODATA & RO_DATA provided for backward compatibility.
 354  * All archs are supposed to use RO_DATA() */
 355 #define RODATA          RO_DATA_SECTION(4096)
 356 #define RO_DATA(align)  RO_DATA_SECTION(align)
 357
 358 #define SECURITY_INIT                                                   \
 359         .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
 360                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 361                 *(.security_initcall.init)                              \
 362                 VMLINUX_SYMBOL(__security_initcall_end) = .;            \
 363         }
 364
 365 /* .text section. Map to function alignment to avoid address changes
 366  * during second ld run in second ld pass when generating System.map */
 367 #define TEXT_TEXT                                                       \
 368                 ALIGN_FUNCTION();                                       \
 369                 *(.text.hot)                                            \
 370                 *(.text)                                                \
 371                 *(.ref.text)                                            \
 372         DEV_KEEP(init.text)                                             \
 373         DEV_KEEP(exit.text)                                             \
 374         CPU_KEEP(init.text)                                             \
 375         CPU_KEEP(exit.text)                                             \
 376         MEM_KEEP(init.text)                                             \
 377         MEM_KEEP(exit.text)                                             \
 378                 *(.text.unlikely)
 379
 380
 381 /* sched.text is aling to function alignment to secure we have same
 382  * address even at second ld pass when generating System.map */
 383 #define SCHED_TEXT                                                      \
 384                 ALIGN_FUNCTION();                                       \
 385                 VMLINUX_SYMBOL(__sched_text_start) = .;                 \
 386                 *(.sched.text)                                          \
 387                 VMLINUX_SYMBOL(__sched_text_end) = .;
 388
 389 /* spinlock.text is aling to function alignment to secure we have same
 390  * address even at second ld pass when generating System.map */
 391 #define LOCK_TEXT                                                       \
 392                 ALIGN_FUNCTION();                                       \
 393                 VMLINUX_SYMBOL(__lock_text_start) = .;                  \
 394                 *(.spinlock.text)                                       \
 395                 VMLINUX_SYMBOL(__lock_text_end) = .;
 396
 397 #define KPROBES_TEXT                                                    \
 398                 ALIGN_FUNCTION();                                       \
 399                 VMLINUX_SYMBOL(__kprobes_text_start) = .;               \
 400                 *(.kprobes.text)                                        \
 401                 VMLINUX_SYMBOL(__kprobes_text_end) = .;
 402
 403 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 404 #define IRQENTRY_TEXT                                                   \
 405                 ALIGN_FUNCTION();                                       \
 406                 VMLINUX_SYMBOL(__irqentry_text_start) = .;              \
 407                 *(.irqentry.text)                                       \
 408                 VMLINUX_SYMBOL(__irqentry_text_end) = .;
 409 #else
 410 #define IRQENTRY_TEXT
 411 #endif
 412
 413 /* Section used for early init (in .S files) */
 414 #define HEAD_TEXT  *(.head.text)
 415
 416 #define HEAD_TEXT_SECTION                                                       \
 417         .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {               \
 418                 HEAD_TEXT                                               \
 419         }
 420
 421 /*
 422  * Exception table
 423  */
 424 #define EXCEPTION_TABLE(align)                                          \
 425         . = ALIGN(align);                                               \
 426         __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {               \
 427                 VMLINUX_SYMBOL(__start___ex_table) = .;                 \
 428                 *(__ex_table)                                           \
 429                 VMLINUX_SYMBOL(__stop___ex_table) = .;                  \
 430         }
 431
 432 /*
 433  * Init task
 434  */
 435 #define INIT_TASK_DATA_SECTION(align)                                   \
 436         . = ALIGN(align);                                               \
 437         .data.init_task : {                                             \
 438                 INIT_TASK_DATA(align)                                   \
 439         }
 440
 441 #ifdef CONFIG_CONSTRUCTORS
 442 #define KERNEL_CTORS()  . = ALIGN(8);                      \
 443                         VMLINUX_SYMBOL(__ctors_start) = .; \
 444                         *(.ctors)                          \
 445                         VMLINUX_SYMBOL(__ctors_end) = .;
 446 #else
 447 #define KERNEL_CTORS()
 448 #endif
 449
 450 /* init and exit section handling */
 451 #define INIT_DATA                                                       \
 452         *(.init.data)                                                   \
 453         DEV_DISCARD(init.data)                                          \
 454         CPU_DISCARD(init.data)                                          \
 455         MEM_DISCARD(init.data)                                          \
 456         KERNEL_CTORS()                                                  \
 457         *(.init.rodata)                                                 \
 458         MCOUNT_REC()                                                    \
 459         DEV_DISCARD(init.rodata)                                        \
 460         CPU_DISCARD(init.rodata)                                        \
 461         MEM_DISCARD(init.rodata)
 462
 463 #define INIT_TEXT                                                       \
 464         *(.init.text)                                                   \
 465         DEV_DISCARD(init.text)                                          \
 466         CPU_DISCARD(init.text)                                          \
 467         MEM_DISCARD(init.text)
 468
 469 #define EXIT_DATA                                                       \
 470         *(.exit.data)                                                   \
 471         DEV_DISCARD(exit.data)                                          \
 472         DEV_DISCARD(exit.rodata)                                        \
 473         CPU_DISCARD(exit.data)                                          \
 474         CPU_DISCARD(exit.rodata)                                        \
 475         MEM_DISCARD(exit.data)                                          \
 476         MEM_DISCARD(exit.rodata)
 477
 478 #define EXIT_TEXT                                                       \
 479         *(.exit.text)                                                   \
 480         DEV_DISCARD(exit.text)                                          \
 481         CPU_DISCARD(exit.text)                                          \
 482         MEM_DISCARD(exit.text)
 483
 484 #define EXIT_CALL                                                       \
 485         *(.exitcall.exit)
 486
 487 /*
 488  * bss (Block Started by Symbol) - uninitialized data
 489  * zeroed during startup
 490  */
 491 #define SBSS(sbss_align)                                                \
 492         . = ALIGN(sbss_align);                                          \
 493         .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {                         \
 494                 *(.sbss)                                                \
 495                 *(.scommon)                                             \
 496         }
 497
 498 #define BSS(bss_align)                                                  \
 499         . = ALIGN(bss_align);                                           \
 500         .bss : AT(ADDR(.bss) - LOAD_OFFSET) {                           \
 501                 *(.bss.page_aligned)                                    \
 502                 *(.dynbss)                                              \
 503                 *(.bss)                                                 \
 504                 *(COMMON)                                               \
 505         }
 506
 507 /*
 508  * DWARF debug sections.
 509  * Symbols in the DWARF debugging sections are relative to
 510  * the beginning of the section so we begin them at 0.
 511  */
 512 #define DWARF_DEBUG                                                     \
 513                 /* DWARF 1 */                                           \
 514                 .debug          0 : { *(.debug) }                       \
 515                 .line           0 : { *(.line) }                        \
 516                 /* GNU DWARF 1 extensions */                            \
 517                 .debug_srcinfo  0 : { *(.debug_srcinfo) }               \
 518                 .debug_sfnames  0 : { *(.debug_sfnames) }               \
 519                 /* DWARF 1.1 and DWARF 2 */                             \
 520                 .debug_aranges  0 : { *(.debug_aranges) }               \
 521                 .debug_pubnames 0 : { *(.debug_pubnames) }              \
 522                 /* DWARF 2 */                                           \
 523                 .debug_info     0 : { *(.debug_info                     \
 524                                 .gnu.linkonce.wi.*) }                   \
 525                 .debug_abbrev   0 : { *(.debug_abbrev) }                \
 526                 .debug_line     0 : { *(.debug_line) }                  \
 527                 .debug_frame    0 : { *(.debug_frame) }                 \
 528                 .debug_str      0 : { *(.debug_str) }                   \
 529                 .debug_loc      0 : { *(.debug_loc) }                   \
 530                 .debug_macinfo  0 : { *(.debug_macinfo) }               \
 531                 /* SGI/MIPS DWARF 2 extensions */                       \
 532                 .debug_weaknames 0 : { *(.debug_weaknames) }            \
 533                 .debug_funcnames 0 : { *(.debug_funcnames) }            \
 534                 .debug_typenames 0 : { *(.debug_typenames) }            \
 535                 .debug_varnames  0 : { *(.debug_varnames) }             \
 536
 537                 /* Stabs debugging sections.  */
 538 #define STABS_DEBUG                                                     \
 539                 .stab 0 : { *(.stab) }                                  \
 540                 .stabstr 0 : { *(.stabstr) }                            \
 541                 .stab.excl 0 : { *(.stab.excl) }                        \
 542                 .stab.exclstr 0 : { *(.stab.exclstr) }                  \
 543                 .stab.index 0 : { *(.stab.index) }                      \
 544                 .stab.indexstr 0 : { *(.stab.indexstr) }                \
 545                 .comment 0 : { *(.comment) }
 546
 547 #ifdef CONFIG_GENERIC_BUG
 548 #define BUG_TABLE                                                       \
 549         . = ALIGN(8);                                                   \
 550         __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {             \
 551                 VMLINUX_SYMBOL(__start___bug_table) = .;                \
 552                 *(__bug_table)                                          \
 553                 VMLINUX_SYMBOL(__stop___bug_table) = .;                 \
 554         }
 555 #else
 556 #define BUG_TABLE
 557 #endif
 558
 559 #ifdef CONFIG_PM_TRACE
 560 #define TRACEDATA                                                       \
 561         . = ALIGN(4);                                                   \
 562         .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {               \
 563                 VMLINUX_SYMBOL(__tracedata_start) = .;                  \
 564                 *(.tracedata)                                           \
 565                 VMLINUX_SYMBOL(__tracedata_end) = .;                    \
 566         }
 567 #else
 568 #define TRACEDATA
 569 #endif
 570
 571 #define NOTES                                                           \
 572         .notes : AT(ADDR(.notes) - LOAD_OFFSET) {                       \
 573                 VMLINUX_SYMBOL(__start_notes) = .;                      \
 574                 *(.note.*)                                              \
 575                 VMLINUX_SYMBOL(__stop_notes) = .;                       \
 576         }
 577
 578 #define INIT_SETUP(initsetup_align)                                     \
 579                 . = ALIGN(initsetup_align);                             \
 580                 VMLINUX_SYMBOL(__setup_start) = .;                      \
 581                 *(.init.setup)                                          \
 582                 VMLINUX_SYMBOL(__setup_end) = .;
 583
 584 #define INITCALLS                                                       \
 585         *(.initcallearly.init)                                          \
 586         VMLINUX_SYMBOL(__early_initcall_end) = .;                       \
 587         *(.initcall0.init)                                              \
 588         *(.initcall0s.init)                                             \
 589         *(.initcall1.init)                                              \
 590         *(.initcall1s.init)                                             \
 591         *(.initcall2.init)                                              \
 592         *(.initcall2s.init)                                             \
 593         *(.initcall3.init)                                              \
 594         *(.initcall3s.init)                                             \
 595         *(.initcall4.init)                                              \
 596         *(.initcall4s.init)                                             \
 597         *(.initcall5.init)                                              \
 598         *(.initcall5s.init)                                             \
 599         *(.initcallrootfs.init)                                         \
 600         *(.initcall6.init)                                              \
 601         *(.initcall6s.init)                                             \
 602         *(.initcall7.init)                                              \
 603         *(.initcall7s.init)
 604
 605 #define INIT_CALLS                                                      \
 606                 VMLINUX_SYMBOL(__initcall_start) = .;                   \
 607                 INITCALLS                                               \
 608                 VMLINUX_SYMBOL(__initcall_end) = .;
 609
 610 #define CON_INITCALL                                                    \
 611                 VMLINUX_SYMBOL(__con_initcall_start) = .;               \
 612                 *(.con_initcall.init)                                   \
 613                 VMLINUX_SYMBOL(__con_initcall_end) = .;
 614
 615 #define SECURITY_INITCALL                                               \
 616                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 617                 *(.security_initcall.init)                              \
 618                 VMLINUX_SYMBOL(__security_initcall_end) = .;
 619
 620 #ifdef CONFIG_BLK_DEV_INITRD
 621 #define INIT_RAM_FS                                                     \
 622         . = ALIGN(PAGE_SIZE);                                           \
 623         VMLINUX_SYMBOL(__initramfs_start) = .;                          \
 624         *(.init.ramfs)                                                  \
 625         VMLINUX_SYMBOL(__initramfs_end) = .;
 626 #else
 627 #define INIT_RAM_FS
 628 #endif
 629
 630 /**
 631  * PERCPU_VADDR - define output section for percpu area
 632  * @vaddr: explicit base address (optional)
 633  * @phdr: destination PHDR (optional)
 634  *
 635  * Macro which expands to output section for percpu area.  If @vaddr
 636  * is not blank, it specifies explicit base address and all percpu
 637  * symbols will be offset from the given address.  If blank, @vaddr
 638  * always equals @laddr + LOAD_OFFSET.
 639  *
 640  * @phdr defines the output PHDR to use if not blank.  Be warned that
 641  * output PHDR is sticky.  If @phdr is specified, the next output
 642  * section in the linker script will go there too.  @phdr should have
 643  * a leading colon.
 644  *
 645  * Note that this macros defines __per_cpu_load as an absolute symbol.
 646  * If there is no need to put the percpu section at a predetermined
 647  * address, use PERCPU().
 648  */
 649 #define PERCPU_VADDR(vaddr, phdr)                                       \
 650         VMLINUX_SYMBOL(__per_cpu_load) = .;                             \
 651         .data.percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load)          \
 652                                 - LOAD_OFFSET) {                        \
 653                 VMLINUX_SYMBOL(__per_cpu_start) = .;                    \
 654                 *(.data.percpu.first)                                   \
 655                 *(.data.percpu.page_aligned)                            \
 656                 *(.data.percpu)                                         \
 657                 *(.data.percpu.shared_aligned)                          \
 658                 VMLINUX_SYMBOL(__per_cpu_end) = .;                      \
 659         } phdr                                                          \
 660         . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data.percpu);
 661
 662 /**
 663  * PERCPU - define output section for percpu area, simple version
 664  * @align: required alignment
 665  *
 666  * Align to @align and outputs output section for percpu area.  This
 667  * macro doesn't maniuplate @vaddr or @phdr and __per_cpu_load and
 668  * __per_cpu_start will be identical.
 669  *
 670  * This macro is equivalent to ALIGN(align); PERCPU_VADDR( , ) except
 671  * that __per_cpu_load is defined as a relative symbol against
 672  * .data.percpu which is required for relocatable x86_32
 673  * configuration.
 674  */
 675 #define PERCPU(align)                                                   \
 676         . = ALIGN(align);                                               \
 677         .data.percpu    : AT(ADDR(.data.percpu) - LOAD_OFFSET) {        \
 678                 VMLINUX_SYMBOL(__per_cpu_load) = .;                     \
 679                 VMLINUX_SYMBOL(__per_cpu_start) = .;                    \
 680                 *(.data.percpu.first)                                   \
 681                 *(.data.percpu.page_aligned)                            \
 682                 *(.data.percpu)                                         \
 683                 *(.data.percpu.shared_aligned)                          \
 684                 VMLINUX_SYMBOL(__per_cpu_end) = .;                      \
 685         }
 686
 687
 688 /*
 689  * Definition of the high level *_SECTION macros
 690  * They will fit only a subset of the architectures
 691  */
 692
 693
 694 /*
 695  * Writeable data.
 696  * All sections are combined in a single .data section.
 697  * The sections following CONSTRUCTORS are arranged so their
 698  * typical alignment matches.
 699  * A cacheline is typical/always less than a PAGE_SIZE so
 700  * the sections that has this restriction (or similar)
 701  * is located before the ones requiring PAGE_SIZE alignment.
 702  * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
 703  * matches the requirment of PAGE_ALIGNED_DATA.
 704  *
 705  * use 0 as page_align if page_aligned data is not used */
 706 #define RW_DATA_SECTION(cacheline, pagealigned, inittask)               \
 707         . = ALIGN(PAGE_SIZE);                                           \
 708         .data : AT(ADDR(.data) - LOAD_OFFSET) {                         \
 709                 INIT_TASK_DATA(inittask)                                \
 710                 CACHELINE_ALIGNED_DATA(cacheline)                       \
 711                 READ_MOSTLY_DATA(cacheline)                             \
 712                 DATA_DATA                                               \
 713                 CONSTRUCTORS                                            \
 714                 NOSAVE_DATA                                             \
 715                 PAGE_ALIGNED_DATA(pagealigned)                          \
 716         }
 717
 718 #define INIT_TEXT_SECTION(inittext_align)                               \
 719         . = ALIGN(inittext_align);                                      \
 720         .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {               \
 721                 VMLINUX_SYMBOL(_sinittext) = .;                         \
 722                 INIT_TEXT                                               \
 723                 VMLINUX_SYMBOL(_einittext) = .;                         \
 724         }
 725
 726 #define INIT_DATA_SECTION(initsetup_align)                              \
 727         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {               \
 728                 INIT_DATA                                               \
 729                 INIT_SETUP(initsetup_align)                             \
 730                 INIT_CALLS                                              \
 731                 CON_INITCALL                                            \
 732                 SECURITY_INITCALL                                       \
 733                 INIT_RAM_FS                                             \
 734         }
 735
 736 #define BSS_SECTION(sbss_align, bss_align, stop_align)                  \
 737         . = ALIGN(sbss_align);                                          \
 738         VMLINUX_SYMBOL(__bss_start) = .;                                \
 739         SBSS(sbss_align)                                                \
 740         BSS(bss_align)                                                  \
 741         . = ALIGN(stop_align);                                          \
 742         VMLINUX_SYMBOL(__bss_stop) = .;