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()    VMLINUX_SYMBOL(__start_mcount_loc) = .; \
  95                         *(__mcount_loc)                         \
  96                         VMLINUX_SYMBOL(__stop_mcount_loc) = .;
  97 #else
  98 #define MCOUNT_REC()
  99 #endif
 100
 101 #ifdef CONFIG_TRACE_BRANCH_PROFILING
 102 #define LIKELY_PROFILE()        VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \
 103                                 *(_ftrace_annotated_branch)                           \
 104                                 VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .;
 105 #else
 106 #define LIKELY_PROFILE()
 107 #endif
 108
 109 #ifdef CONFIG_PROFILE_ALL_BRANCHES
 110 #define BRANCH_PROFILE()        VMLINUX_SYMBOL(__start_branch_profile) = .;   \
 111                                 *(_ftrace_branch)                             \
 112                                 VMLINUX_SYMBOL(__stop_branch_profile) = .;
 113 #else
 114 #define BRANCH_PROFILE()
 115 #endif
 116
 117 #ifdef CONFIG_EVENT_TRACING
 118 #define FTRACE_EVENTS() VMLINUX_SYMBOL(__start_ftrace_events) = .;      \
 119                         *(_ftrace_events)                               \
 120                         VMLINUX_SYMBOL(__stop_ftrace_events) = .;
 121 #else
 122 #define FTRACE_EVENTS()
 123 #endif
 124
 125 #ifdef CONFIG_TRACING
 126 #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .;      \
 127                          *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \
 128                          VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;
 129 #else
 130 #define TRACE_PRINTKS()
 131 #endif
 132
 133 #ifdef CONFIG_FTRACE_SYSCALLS
 134 #define TRACE_SYSCALLS() VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \
 135                          *(__syscalls_metadata)                         \
 136                          VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
 137 #else
 138 #define TRACE_SYSCALLS()
 139 #endif
 140
 141 /* .data section */
 142 #define DATA_DATA                                                       \
 143         *(.data)                                                        \
 144         *(.ref.data)                                                    \
 145         DEV_KEEP(init.data)                                             \
 146         DEV_KEEP(exit.data)                                             \
 147         CPU_KEEP(init.data)                                             \
 148         CPU_KEEP(exit.data)                                             \
 149         MEM_KEEP(init.data)                                             \
 150         MEM_KEEP(exit.data)                                             \
 151         . = ALIGN(8);                                                   \
 152         VMLINUX_SYMBOL(__start___markers) = .;                          \
 153         *(__markers)                                                    \
 154         VMLINUX_SYMBOL(__stop___markers) = .;                           \
 155         . = ALIGN(32);                                                  \
 156         VMLINUX_SYMBOL(__start___tracepoints) = .;                      \
 157         *(__tracepoints)                                                \
 158         VMLINUX_SYMBOL(__stop___tracepoints) = .;                       \
 159         /* implement dynamic printk debug */                            \
 160         . = ALIGN(8);                                                   \
 161         VMLINUX_SYMBOL(__start___verbose) = .;                          \
 162         *(__verbose)                                                    \
 163         VMLINUX_SYMBOL(__stop___verbose) = .;                           \
 164         LIKELY_PROFILE()                                                \
 165         BRANCH_PROFILE()                                                \
 166         TRACE_PRINTKS()                                                 \
 167         FTRACE_EVENTS()                                                 \
 168         TRACE_SYSCALLS()
 169
 170 /*
 171  * Data section helpers
 172  */
 173 #define NOSAVE_DATA                                                     \
 174         . = ALIGN(PAGE_SIZE);                                           \
 175         VMLINUX_SYMBOL(__nosave_begin) = .;                             \
 176         *(.data.nosave)                                                 \
 177         . = ALIGN(PAGE_SIZE);                                           \
 178         VMLINUX_SYMBOL(__nosave_end) = .;
 179
 180 #define PAGE_ALIGNED_DATA(page_align)                                   \
 181         . = ALIGN(page_align);                                          \
 182         *(.data.page_aligned)
 183
 184 #define READ_MOSTLY_DATA(align)                                         \
 185         . = ALIGN(align);                                               \
 186         *(.data.read_mostly)
 187
 188 #define CACHELINE_ALIGNED_DATA(align)                                   \
 189         . = ALIGN(align);                                               \
 190         *(.data.cacheline_aligned)
 191
 192 #define INIT_TASK_DATA(align)                                           \
 193         . = ALIGN(align);                                               \
 194         *(.data.init_task)
 195
 196 /*
 197  * Read only Data
 198  */
 199 #define RO_DATA_SECTION(align)                                          \
 200         . = ALIGN((align));                                             \
 201         .rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {           \
 202                 VMLINUX_SYMBOL(__start_rodata) = .;                     \
 203                 *(.rodata) *(.rodata.*)                                 \
 204                 *(__vermagic)           /* Kernel version magic */      \
 205                 *(__markers_strings)    /* Markers: strings */          \
 206                 *(__tracepoints_strings)/* Tracepoints: strings */      \
 207         }                                                               \
 208                                                                         \
 209         .rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {          \
 210                 *(.rodata1)                                             \
 211         }                                                               \
 212                                                                         \
 213         BUG_TABLE                                                       \
 214                                                                         \
 215         /* PCI quirks */                                                \
 216         .pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {        \
 217                 VMLINUX_SYMBOL(__start_pci_fixups_early) = .;           \
 218                 *(.pci_fixup_early)                                     \
 219                 VMLINUX_SYMBOL(__end_pci_fixups_early) = .;             \
 220                 VMLINUX_SYMBOL(__start_pci_fixups_header) = .;          \
 221                 *(.pci_fixup_header)                                    \
 222                 VMLINUX_SYMBOL(__end_pci_fixups_header) = .;            \
 223                 VMLINUX_SYMBOL(__start_pci_fixups_final) = .;           \
 224                 *(.pci_fixup_final)                                     \
 225                 VMLINUX_SYMBOL(__end_pci_fixups_final) = .;             \
 226                 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .;          \
 227                 *(.pci_fixup_enable)                                    \
 228                 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .;            \
 229                 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .;          \
 230                 *(.pci_fixup_resume)                                    \
 231                 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .;            \
 232                 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .;    \
 233                 *(.pci_fixup_resume_early)                              \
 234                 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .;      \
 235                 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .;         \
 236                 *(.pci_fixup_suspend)                                   \
 237                 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .;           \
 238         }                                                               \
 239                                                                         \
 240         /* Built-in firmware blobs */                                   \
 241         .builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {      \
 242                 VMLINUX_SYMBOL(__start_builtin_fw) = .;                 \
 243                 *(.builtin_fw)                                          \
 244                 VMLINUX_SYMBOL(__end_builtin_fw) = .;                   \
 245         }                                                               \
 246                                                                         \
 247         /* RapidIO route ops */                                         \
 248         .rio_route        : AT(ADDR(.rio_route) - LOAD_OFFSET) {        \
 249                 VMLINUX_SYMBOL(__start_rio_route_ops) = .;              \
 250                 *(.rio_route_ops)                                       \
 251                 VMLINUX_SYMBOL(__end_rio_route_ops) = .;                \
 252         }                                                               \
 253                                                                         \
 254         TRACEDATA                                                       \
 255                                                                         \
 256         /* Kernel symbol table: Normal symbols */                       \
 257         __ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {         \
 258                 VMLINUX_SYMBOL(__start___ksymtab) = .;                  \
 259                 *(__ksymtab)                                            \
 260                 VMLINUX_SYMBOL(__stop___ksymtab) = .;                   \
 261         }                                                               \
 262                                                                         \
 263         /* Kernel symbol table: GPL-only symbols */                     \
 264         __ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {     \
 265                 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .;              \
 266                 *(__ksymtab_gpl)                                        \
 267                 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .;               \
 268         }                                                               \
 269                                                                         \
 270         /* Kernel symbol table: Normal unused symbols */                \
 271         __ksymtab_unused  : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) {  \
 272                 VMLINUX_SYMBOL(__start___ksymtab_unused) = .;           \
 273                 *(__ksymtab_unused)                                     \
 274                 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .;            \
 275         }                                                               \
 276                                                                         \
 277         /* Kernel symbol table: GPL-only unused symbols */              \
 278         __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
 279                 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .;       \
 280                 *(__ksymtab_unused_gpl)                                 \
 281                 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .;        \
 282         }                                                               \
 283                                                                         \
 284         /* Kernel symbol table: GPL-future-only symbols */              \
 285         __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
 286                 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .;       \
 287                 *(__ksymtab_gpl_future)                                 \
 288                 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .;        \
 289         }                                                               \
 290                                                                         \
 291         /* Kernel symbol table: Normal symbols */                       \
 292         __kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {         \
 293                 VMLINUX_SYMBOL(__start___kcrctab) = .;                  \
 294                 *(__kcrctab)                                            \
 295                 VMLINUX_SYMBOL(__stop___kcrctab) = .;                   \
 296         }                                                               \
 297                                                                         \
 298         /* Kernel symbol table: GPL-only symbols */                     \
 299         __kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {     \
 300                 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .;              \
 301                 *(__kcrctab_gpl)                                        \
 302                 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .;               \
 303         }                                                               \
 304                                                                         \
 305         /* Kernel symbol table: Normal unused symbols */                \
 306         __kcrctab_unused  : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) {  \
 307                 VMLINUX_SYMBOL(__start___kcrctab_unused) = .;           \
 308                 *(__kcrctab_unused)                                     \
 309                 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .;            \
 310         }                                                               \
 311                                                                         \
 312         /* Kernel symbol table: GPL-only unused symbols */              \
 313         __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
 314                 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .;       \
 315                 *(__kcrctab_unused_gpl)                                 \
 316                 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .;        \
 317         }                                                               \
 318                                                                         \
 319         /* Kernel symbol table: GPL-future-only symbols */              \
 320         __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
 321                 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .;       \
 322                 *(__kcrctab_gpl_future)                                 \
 323                 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .;        \
 324         }                                                               \
 325                                                                         \
 326         /* Kernel symbol table: strings */                              \
 327         __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
 328                 *(__ksymtab_strings)                                    \
 329         }                                                               \
 330                                                                         \
 331         /* __*init sections */                                          \
 332         __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {         \
 333                 *(.ref.rodata)                                          \
 334                 MCOUNT_REC()                                            \
 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         DEV_DISCARD(init.rodata)                                        \
 459         CPU_DISCARD(init.rodata)                                        \
 460         MEM_DISCARD(init.rodata)
 461
 462 #define INIT_TEXT                                                       \
 463         *(.init.text)                                                   \
 464         DEV_DISCARD(init.text)                                          \
 465         CPU_DISCARD(init.text)                                          \
 466         MEM_DISCARD(init.text)
 467
 468 #define EXIT_DATA                                                       \
 469         *(.exit.data)                                                   \
 470         DEV_DISCARD(exit.data)                                          \
 471         DEV_DISCARD(exit.rodata)                                        \
 472         CPU_DISCARD(exit.data)                                          \
 473         CPU_DISCARD(exit.rodata)                                        \
 474         MEM_DISCARD(exit.data)                                          \
 475         MEM_DISCARD(exit.rodata)
 476
 477 #define EXIT_TEXT                                                       \
 478         *(.exit.text)                                                   \
 479         DEV_DISCARD(exit.text)                                          \
 480         CPU_DISCARD(exit.text)                                          \
 481         MEM_DISCARD(exit.text)
 482
 483 #define EXIT_CALL                                                       \
 484         *(.exitcall.exit)
 485
 486 /*
 487  * bss (Block Started by Symbol) - uninitialized data
 488  * zeroed during startup
 489  */
 490 #define SBSS(sbss_align)                                                \
 491         . = ALIGN(sbss_align);                                          \
 492         .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {                         \
 493                 *(.sbss)                                                \
 494                 *(.scommon)                                             \
 495         }
 496
 497 #define BSS(bss_align)                                                  \
 498         . = ALIGN(bss_align);                                           \
 499         .bss : AT(ADDR(.bss) - LOAD_OFFSET) {                           \
 500                 *(.bss.page_aligned)                                    \
 501                 *(.dynbss)                                              \
 502                 *(.bss)                                                 \
 503                 *(COMMON)                                               \
 504         }
 505
 506 /*
 507  * DWARF debug sections.
 508  * Symbols in the DWARF debugging sections are relative to
 509  * the beginning of the section so we begin them at 0.
 510  */
 511 #define DWARF_DEBUG                                                     \
 512                 /* DWARF 1 */                                           \
 513                 .debug          0 : { *(.debug) }                       \
 514                 .line           0 : { *(.line) }                        \
 515                 /* GNU DWARF 1 extensions */                            \
 516                 .debug_srcinfo  0 : { *(.debug_srcinfo) }               \
 517                 .debug_sfnames  0 : { *(.debug_sfnames) }               \
 518                 /* DWARF 1.1 and DWARF 2 */                             \
 519                 .debug_aranges  0 : { *(.debug_aranges) }               \
 520                 .debug_pubnames 0 : { *(.debug_pubnames) }              \
 521                 /* DWARF 2 */                                           \
 522                 .debug_info     0 : { *(.debug_info                     \
 523                                 .gnu.linkonce.wi.*) }                   \
 524                 .debug_abbrev   0 : { *(.debug_abbrev) }                \
 525                 .debug_line     0 : { *(.debug_line) }                  \
 526                 .debug_frame    0 : { *(.debug_frame) }                 \
 527                 .debug_str      0 : { *(.debug_str) }                   \
 528                 .debug_loc      0 : { *(.debug_loc) }                   \
 529                 .debug_macinfo  0 : { *(.debug_macinfo) }               \
 530                 /* SGI/MIPS DWARF 2 extensions */                       \
 531                 .debug_weaknames 0 : { *(.debug_weaknames) }            \
 532                 .debug_funcnames 0 : { *(.debug_funcnames) }            \
 533                 .debug_typenames 0 : { *(.debug_typenames) }            \
 534                 .debug_varnames  0 : { *(.debug_varnames) }             \
 535
 536                 /* Stabs debugging sections.  */
 537 #define STABS_DEBUG                                                     \
 538                 .stab 0 : { *(.stab) }                                  \
 539                 .stabstr 0 : { *(.stabstr) }                            \
 540                 .stab.excl 0 : { *(.stab.excl) }                        \
 541                 .stab.exclstr 0 : { *(.stab.exclstr) }                  \
 542                 .stab.index 0 : { *(.stab.index) }                      \
 543                 .stab.indexstr 0 : { *(.stab.indexstr) }                \
 544                 .comment 0 : { *(.comment) }
 545
 546 #ifdef CONFIG_GENERIC_BUG
 547 #define BUG_TABLE                                                       \
 548         . = ALIGN(8);                                                   \
 549         __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {             \
 550                 VMLINUX_SYMBOL(__start___bug_table) = .;                \
 551                 *(__bug_table)                                          \
 552                 VMLINUX_SYMBOL(__stop___bug_table) = .;                 \
 553         }
 554 #else
 555 #define BUG_TABLE
 556 #endif
 557
 558 #ifdef CONFIG_PM_TRACE
 559 #define TRACEDATA                                                       \
 560         . = ALIGN(4);                                                   \
 561         .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {               \
 562                 VMLINUX_SYMBOL(__tracedata_start) = .;                  \
 563                 *(.tracedata)                                           \
 564                 VMLINUX_SYMBOL(__tracedata_end) = .;                    \
 565         }
 566 #else
 567 #define TRACEDATA
 568 #endif
 569
 570 #define NOTES                                                           \
 571         .notes : AT(ADDR(.notes) - LOAD_OFFSET) {                       \
 572                 VMLINUX_SYMBOL(__start_notes) = .;                      \
 573                 *(.note.*)                                              \
 574                 VMLINUX_SYMBOL(__stop_notes) = .;                       \
 575         }
 576
 577 #define INIT_SETUP(initsetup_align)                                     \
 578                 . = ALIGN(initsetup_align);                             \
 579                 VMLINUX_SYMBOL(__setup_start) = .;                      \
 580                 *(.init.setup)                                          \
 581                 VMLINUX_SYMBOL(__setup_end) = .;
 582
 583 #define INITCALLS                                                       \
 584         *(.initcallearly.init)                                          \
 585         VMLINUX_SYMBOL(__early_initcall_end) = .;                       \
 586         *(.initcall0.init)                                              \
 587         *(.initcall0s.init)                                             \
 588         *(.initcall1.init)                                              \
 589         *(.initcall1s.init)                                             \
 590         *(.initcall2.init)                                              \
 591         *(.initcall2s.init)                                             \
 592         *(.initcall3.init)                                              \
 593         *(.initcall3s.init)                                             \
 594         *(.initcall4.init)                                              \
 595         *(.initcall4s.init)                                             \
 596         *(.initcall5.init)                                              \
 597         *(.initcall5s.init)                                             \
 598         *(.initcallrootfs.init)                                         \
 599         *(.initcall6.init)                                              \
 600         *(.initcall6s.init)                                             \
 601         *(.initcall7.init)                                              \
 602         *(.initcall7s.init)
 603
 604 #define INIT_CALLS                                                      \
 605                 VMLINUX_SYMBOL(__initcall_start) = .;                   \
 606                 INITCALLS                                               \
 607                 VMLINUX_SYMBOL(__initcall_end) = .;
 608
 609 #define CON_INITCALL                                                    \
 610                 VMLINUX_SYMBOL(__con_initcall_start) = .;               \
 611                 *(.con_initcall.init)                                   \
 612                 VMLINUX_SYMBOL(__con_initcall_end) = .;
 613
 614 #define SECURITY_INITCALL                                               \
 615                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 616                 *(.security_initcall.init)                              \
 617                 VMLINUX_SYMBOL(__security_initcall_end) = .;
 618
 619 #ifdef CONFIG_BLK_DEV_INITRD
 620 #define INIT_RAM_FS                                                     \
 621         . = ALIGN(PAGE_SIZE);                                           \
 622         VMLINUX_SYMBOL(__initramfs_start) = .;                          \
 623         *(.init.ramfs)                                                  \
 624         VMLINUX_SYMBOL(__initramfs_end) = .;
 625 #else
 626 #define INIT_RAM_FS
 627 #endif
 628
 629 /**
 630  * PERCPU_VADDR - define output section for percpu area
 631  * @vaddr: explicit base address (optional)
 632  * @phdr: destination PHDR (optional)
 633  *
 634  * Macro which expands to output section for percpu area.  If @vaddr
 635  * is not blank, it specifies explicit base address and all percpu
 636  * symbols will be offset from the given address.  If blank, @vaddr
 637  * always equals @laddr + LOAD_OFFSET.
 638  *
 639  * @phdr defines the output PHDR to use if not blank.  Be warned that
 640  * output PHDR is sticky.  If @phdr is specified, the next output
 641  * section in the linker script will go there too.  @phdr should have
 642  * a leading colon.
 643  *
 644  * Note that this macros defines __per_cpu_load as an absolute symbol.
 645  * If there is no need to put the percpu section at a predetermined
 646  * address, use PERCPU().
 647  */
 648 #define PERCPU_VADDR(vaddr, phdr)                                       \
 649         VMLINUX_SYMBOL(__per_cpu_load) = .;                             \
 650         .data.percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load)          \
 651                                 - LOAD_OFFSET) {                        \
 652                 VMLINUX_SYMBOL(__per_cpu_start) = .;                    \
 653                 *(.data.percpu.first)                                   \
 654                 *(.data.percpu.page_aligned)                            \
 655                 *(.data.percpu)                                         \
 656                 *(.data.percpu.shared_aligned)                          \
 657                 VMLINUX_SYMBOL(__per_cpu_end) = .;                      \
 658         } phdr                                                          \
 659         . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data.percpu);
 660
 661 /**
 662  * PERCPU - define output section for percpu area, simple version
 663  * @align: required alignment
 664  *
 665  * Align to @align and outputs output section for percpu area.  This
 666  * macro doesn't maniuplate @vaddr or @phdr and __per_cpu_load and
 667  * __per_cpu_start will be identical.
 668  *
 669  * This macro is equivalent to ALIGN(align); PERCPU_VADDR( , ) except
 670  * that __per_cpu_load is defined as a relative symbol against
 671  * .data.percpu which is required for relocatable x86_32
 672  * configuration.
 673  */
 674 #define PERCPU(align)                                                   \
 675         . = ALIGN(align);                                               \
 676         .data.percpu    : AT(ADDR(.data.percpu) - LOAD_OFFSET) {        \
 677                 VMLINUX_SYMBOL(__per_cpu_load) = .;                     \
 678                 VMLINUX_SYMBOL(__per_cpu_start) = .;                    \
 679                 *(.data.percpu.first)                                   \
 680                 *(.data.percpu.page_aligned)                            \
 681                 *(.data.percpu)                                         \
 682                 *(.data.percpu.shared_aligned)                          \
 683                 VMLINUX_SYMBOL(__per_cpu_end) = .;                      \
 684         }
 685
 686
 687 /*
 688  * Definition of the high level *_SECTION macros
 689  * They will fit only a subset of the architectures
 690  */
 691
 692
 693 /*
 694  * Writeable data.
 695  * All sections are combined in a single .data section.
 696  * The sections following CONSTRUCTORS are arranged so their
 697  * typical alignment matches.
 698  * A cacheline is typical/always less than a PAGE_SIZE so
 699  * the sections that has this restriction (or similar)
 700  * is located before the ones requiring PAGE_SIZE alignment.
 701  * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
 702  * matches the requirment of PAGE_ALIGNED_DATA.
 703  *
 704  * use 0 as page_align if page_aligned data is not used */
 705 #define RW_DATA_SECTION(cacheline, pagealigned, inittask)               \
 706         . = ALIGN(PAGE_SIZE);                                           \
 707         .data : AT(ADDR(.data) - LOAD_OFFSET) {                         \
 708                 INIT_TASK_DATA(inittask)                                \
 709                 CACHELINE_ALIGNED_DATA(cacheline)                       \
 710                 READ_MOSTLY_DATA(cacheline)                             \
 711                 DATA_DATA                                               \
 712                 CONSTRUCTORS                                            \
 713                 NOSAVE_DATA                                             \
 714                 PAGE_ALIGNED_DATA(pagealigned)                          \
 715         }
 716
 717 #define INIT_TEXT_SECTION(inittext_align)                               \
 718         . = ALIGN(inittext_align);                                      \
 719         .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {               \
 720                 VMLINUX_SYMBOL(_sinittext) = .;                         \
 721                 INIT_TEXT                                               \
 722                 VMLINUX_SYMBOL(_einittext) = .;                         \
 723         }
 724
 725 #define INIT_DATA_SECTION(initsetup_align)                              \
 726         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {               \
 727                 INIT_DATA                                               \
 728                 INIT_SETUP(initsetup_align)                             \
 729                 INIT_CALLS                                              \
 730                 CON_INITCALL                                            \
 731                 SECURITY_INITCALL                                       \
 732                 INIT_RAM_FS                                             \
 733         }
 734
 735 #define BSS_SECTION(sbss_align, bss_align, stop_align)                  \
 736         . = ALIGN(sbss_align);                                          \
 737         VMLINUX_SYMBOL(__bss_start) = .;                                \
 738         SBSS(sbss_align)                                                \
 739         BSS(bss_align)                                                  \
 740         . = ALIGN(stop_align);                                          \
 741         VMLINUX_SYMBOL(__bss_stop) = .;