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 VMLINUX_SYMBOL
  56 #define VMLINUX_SYMBOL(_sym_) _sym_
  57 #endif
  58
  59 /* Align . to a 8 byte boundary equals to maximum function alignment. */
  60 #define ALIGN_FUNCTION()  . = ALIGN(8)
  61
  62 /* The actual configuration determine if the init/exit sections
  63  * are handled as text/data or they can be discarded (which
  64  * often happens at runtime)
  65  */
  66 #ifdef CONFIG_HOTPLUG
  67 #define DEV_KEEP(sec)    *(.dev##sec)
  68 #define DEV_DISCARD(sec)
  69 #else
  70 #define DEV_KEEP(sec)
  71 #define DEV_DISCARD(sec) *(.dev##sec)
  72 #endif
  73
  74 #ifdef CONFIG_HOTPLUG_CPU
  75 #define CPU_KEEP(sec)    *(.cpu##sec)
  76 #define CPU_DISCARD(sec)
  77 #else
  78 #define CPU_KEEP(sec)
  79 #define CPU_DISCARD(sec) *(.cpu##sec)
  80 #endif
  81
  82 #if defined(CONFIG_MEMORY_HOTPLUG)
  83 #define MEM_KEEP(sec)    *(.mem##sec)
  84 #define MEM_DISCARD(sec)
  85 #else
  86 #define MEM_KEEP(sec)
  87 #define MEM_DISCARD(sec) *(.mem##sec)
  88 #endif
  89
  90 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
  91 #define MCOUNT_REC()    . = ALIGN(8);                           \
  92                         VMLINUX_SYMBOL(__start_mcount_loc) = .; \
  93                         *(__mcount_loc)                         \
  94                         VMLINUX_SYMBOL(__stop_mcount_loc) = .;
  95 #else
  96 #define MCOUNT_REC()
  97 #endif
  98
  99 #ifdef CONFIG_TRACE_BRANCH_PROFILING
 100 #define LIKELY_PROFILE()        VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \
 101                                 *(_ftrace_annotated_branch)                           \
 102                                 VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .;
 103 #else
 104 #define LIKELY_PROFILE()
 105 #endif
 106
 107 #ifdef CONFIG_PROFILE_ALL_BRANCHES
 108 #define BRANCH_PROFILE()        VMLINUX_SYMBOL(__start_branch_profile) = .;   \
 109                                 *(_ftrace_branch)                             \
 110                                 VMLINUX_SYMBOL(__stop_branch_profile) = .;
 111 #else
 112 #define BRANCH_PROFILE()
 113 #endif
 114
 115 #ifdef CONFIG_EVENT_TRACING
 116 #define FTRACE_EVENTS() VMLINUX_SYMBOL(__start_ftrace_events) = .;      \
 117                         *(_ftrace_events)                               \
 118                         VMLINUX_SYMBOL(__stop_ftrace_events) = .;
 119 #else
 120 #define FTRACE_EVENTS()
 121 #endif
 122
 123 #ifdef CONFIG_TRACING
 124 #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .;      \
 125                          *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \
 126                          VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;
 127 #else
 128 #define TRACE_PRINTKS()
 129 #endif
 130
 131 #ifdef CONFIG_FTRACE_SYSCALLS
 132 #define TRACE_SYSCALLS() VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \
 133                          *(__syscalls_metadata)                         \
 134                          VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
 135 #else
 136 #define TRACE_SYSCALLS()
 137 #endif
 138
 139 /* .data section */
 140 #define DATA_DATA                                                       \
 141         *(.data)                                                        \
 142         *(.ref.data)                                                    \
 143         DEV_KEEP(init.data)                                             \
 144         DEV_KEEP(exit.data)                                             \
 145         CPU_KEEP(init.data)                                             \
 146         CPU_KEEP(exit.data)                                             \
 147         MEM_KEEP(init.data)                                             \
 148         MEM_KEEP(exit.data)                                             \
 149         . = ALIGN(8);                                                   \
 150         VMLINUX_SYMBOL(__start___markers) = .;                          \
 151         *(__markers)                                                    \
 152         VMLINUX_SYMBOL(__stop___markers) = .;                           \
 153         . = ALIGN(32);                                                  \
 154         VMLINUX_SYMBOL(__start___tracepoints) = .;                      \
 155         *(__tracepoints)                                                \
 156         VMLINUX_SYMBOL(__stop___tracepoints) = .;                       \
 157         /* implement dynamic printk debug */                            \
 158         . = ALIGN(8);                                                   \
 159         VMLINUX_SYMBOL(__start___verbose) = .;                          \
 160         *(__verbose)                                                    \
 161         VMLINUX_SYMBOL(__stop___verbose) = .;                           \
 162         LIKELY_PROFILE()                                                \
 163         BRANCH_PROFILE()                                                \
 164         TRACE_PRINTKS()                                                 \
 165         FTRACE_EVENTS()                                                 \
 166         TRACE_SYSCALLS()
 167
 168 /*
 169  * Data section helpers
 170  */
 171 #define NOSAVE_DATA                                                     \
 172         . = ALIGN(PAGE_SIZE);                                           \
 173         VMLINUX_SYMBOL(__nosave_begin) = .;                             \
 174         *(.data.nosave)                                                 \
 175         . = ALIGN(PAGE_SIZE);                                           \
 176         VMLINUX_SYMBOL(__nosave_end) = .;
 177
 178 #define PAGE_ALIGNED_DATA(page_align)                                   \
 179         . = ALIGN(page_align);                                          \
 180         *(.data.page_aligned)
 181
 182 #define READ_MOSTLY_DATA(align)                                         \
 183         . = ALIGN(align);                                               \
 184         *(.data.read_mostly)
 185
 186 #define CACHELINE_ALIGNED_DATA(align)                                   \
 187         . = ALIGN(align);                                               \
 188         *(.data.cacheline_aligned)
 189
 190 #define INIT_TASK_DATA(align)                                           \
 191         . = ALIGN(align);                                               \
 192         *(.data.init_task)
 193
 194 /*
 195  * Read only Data
 196  */
 197 #define RO_DATA_SECTION(align)                                          \
 198         . = ALIGN((align));                                             \
 199         .rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {           \
 200                 VMLINUX_SYMBOL(__start_rodata) = .;                     \
 201                 *(.rodata) *(.rodata.*)                                 \
 202                 *(__vermagic)           /* Kernel version magic */      \
 203                 *(__markers_strings)    /* Markers: strings */          \
 204                 *(__tracepoints_strings)/* Tracepoints: strings */      \
 205         }                                                               \
 206                                                                         \
 207         .rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {          \
 208                 *(.rodata1)                                             \
 209         }                                                               \
 210                                                                         \
 211         BUG_TABLE                                                       \
 212                                                                         \
 213         /* PCI quirks */                                                \
 214         .pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {        \
 215                 VMLINUX_SYMBOL(__start_pci_fixups_early) = .;           \
 216                 *(.pci_fixup_early)                                     \
 217                 VMLINUX_SYMBOL(__end_pci_fixups_early) = .;             \
 218                 VMLINUX_SYMBOL(__start_pci_fixups_header) = .;          \
 219                 *(.pci_fixup_header)                                    \
 220                 VMLINUX_SYMBOL(__end_pci_fixups_header) = .;            \
 221                 VMLINUX_SYMBOL(__start_pci_fixups_final) = .;           \
 222                 *(.pci_fixup_final)                                     \
 223                 VMLINUX_SYMBOL(__end_pci_fixups_final) = .;             \
 224                 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .;          \
 225                 *(.pci_fixup_enable)                                    \
 226                 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .;            \
 227                 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .;          \
 228                 *(.pci_fixup_resume)                                    \
 229                 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .;            \
 230                 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .;    \
 231                 *(.pci_fixup_resume_early)                              \
 232                 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .;      \
 233                 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .;         \
 234                 *(.pci_fixup_suspend)                                   \
 235                 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .;           \
 236         }                                                               \
 237                                                                         \
 238         /* Built-in firmware blobs */                                   \
 239         .builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {      \
 240                 VMLINUX_SYMBOL(__start_builtin_fw) = .;                 \
 241                 *(.builtin_fw)                                          \
 242                 VMLINUX_SYMBOL(__end_builtin_fw) = .;                   \
 243         }                                                               \
 244                                                                         \
 245         /* RapidIO route ops */                                         \
 246         .rio_route        : AT(ADDR(.rio_route) - LOAD_OFFSET) {        \
 247                 VMLINUX_SYMBOL(__start_rio_route_ops) = .;              \
 248                 *(.rio_route_ops)                                       \
 249                 VMLINUX_SYMBOL(__end_rio_route_ops) = .;                \
 250         }                                                               \
 251                                                                         \
 252         TRACEDATA                                                       \
 253                                                                         \
 254         /* Kernel symbol table: Normal symbols */                       \
 255         __ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {         \
 256                 VMLINUX_SYMBOL(__start___ksymtab) = .;                  \
 257                 *(__ksymtab)                                            \
 258                 VMLINUX_SYMBOL(__stop___ksymtab) = .;                   \
 259         }                                                               \
 260                                                                         \
 261         /* Kernel symbol table: GPL-only symbols */                     \
 262         __ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {     \
 263                 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .;              \
 264                 *(__ksymtab_gpl)                                        \
 265                 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .;               \
 266         }                                                               \
 267                                                                         \
 268         /* Kernel symbol table: Normal unused symbols */                \
 269         __ksymtab_unused  : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) {  \
 270                 VMLINUX_SYMBOL(__start___ksymtab_unused) = .;           \
 271                 *(__ksymtab_unused)                                     \
 272                 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .;            \
 273         }                                                               \
 274                                                                         \
 275         /* Kernel symbol table: GPL-only unused symbols */              \
 276         __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
 277                 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .;       \
 278                 *(__ksymtab_unused_gpl)                                 \
 279                 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .;        \
 280         }                                                               \
 281                                                                         \
 282         /* Kernel symbol table: GPL-future-only symbols */              \
 283         __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
 284                 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .;       \
 285                 *(__ksymtab_gpl_future)                                 \
 286                 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .;        \
 287         }                                                               \
 288                                                                         \
 289         /* Kernel symbol table: Normal symbols */                       \
 290         __kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {         \
 291                 VMLINUX_SYMBOL(__start___kcrctab) = .;                  \
 292                 *(__kcrctab)                                            \
 293                 VMLINUX_SYMBOL(__stop___kcrctab) = .;                   \
 294         }                                                               \
 295                                                                         \
 296         /* Kernel symbol table: GPL-only symbols */                     \
 297         __kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {     \
 298                 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .;              \
 299                 *(__kcrctab_gpl)                                        \
 300                 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .;               \
 301         }                                                               \
 302                                                                         \
 303         /* Kernel symbol table: Normal unused symbols */                \
 304         __kcrctab_unused  : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) {  \
 305                 VMLINUX_SYMBOL(__start___kcrctab_unused) = .;           \
 306                 *(__kcrctab_unused)                                     \
 307                 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .;            \
 308         }                                                               \
 309                                                                         \
 310         /* Kernel symbol table: GPL-only unused symbols */              \
 311         __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
 312                 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .;       \
 313                 *(__kcrctab_unused_gpl)                                 \
 314                 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .;        \
 315         }                                                               \
 316                                                                         \
 317         /* Kernel symbol table: GPL-future-only symbols */              \
 318         __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
 319                 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .;       \
 320                 *(__kcrctab_gpl_future)                                 \
 321                 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .;        \
 322         }                                                               \
 323                                                                         \
 324         /* Kernel symbol table: strings */                              \
 325         __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
 326                 *(__ksymtab_strings)                                    \
 327         }                                                               \
 328                                                                         \
 329         /* __*init sections */                                          \
 330         __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {         \
 331                 *(.ref.rodata)                                          \
 332                 DEV_KEEP(init.rodata)                                   \
 333                 DEV_KEEP(exit.rodata)                                   \
 334                 CPU_KEEP(init.rodata)                                   \
 335                 CPU_KEEP(exit.rodata)                                   \
 336                 MEM_KEEP(init.rodata)                                   \
 337                 MEM_KEEP(exit.rodata)                                   \
 338         }                                                               \
 339                                                                         \
 340         EH_FRAME                                                        \
 341                                                                         \
 342         /* Built-in module parameters. */                               \
 343         __param : AT(ADDR(__param) - LOAD_OFFSET) {                     \
 344                 VMLINUX_SYMBOL(__start___param) = .;                    \
 345                 *(__param)                                              \
 346                 VMLINUX_SYMBOL(__stop___param) = .;                     \
 347                 . = ALIGN((align));                                     \
 348                 VMLINUX_SYMBOL(__end_rodata) = .;                       \
 349         }                                                               \
 350         . = ALIGN((align));
 351
 352 /* RODATA & RO_DATA provided for backward compatibility.
 353  * All archs are supposed to use RO_DATA() */
 354 #define RODATA          RO_DATA_SECTION(4096)
 355 #define RO_DATA(align)  RO_DATA_SECTION(align)
 356
 357 #define SECURITY_INIT                                                   \
 358         .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
 359                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 360                 *(.security_initcall.init)                              \
 361                 VMLINUX_SYMBOL(__security_initcall_end) = .;            \
 362         }
 363
 364 /* .text section. Map to function alignment to avoid address changes
 365  * during second ld run in second ld pass when generating System.map */
 366 #define TEXT_TEXT                                                       \
 367                 ALIGN_FUNCTION();                                       \
 368                 *(.text.hot)                                            \
 369                 *(.text)                                                \
 370                 *(.ref.text)                                            \
 371         DEV_KEEP(init.text)                                             \
 372         DEV_KEEP(exit.text)                                             \
 373         CPU_KEEP(init.text)                                             \
 374         CPU_KEEP(exit.text)                                             \
 375         MEM_KEEP(init.text)                                             \
 376         MEM_KEEP(exit.text)                                             \
 377                 *(.text.unlikely)
 378
 379
 380 /* sched.text is aling to function alignment to secure we have same
 381  * address even at second ld pass when generating System.map */
 382 #define SCHED_TEXT                                                      \
 383                 ALIGN_FUNCTION();                                       \
 384                 VMLINUX_SYMBOL(__sched_text_start) = .;                 \
 385                 *(.sched.text)                                          \
 386                 VMLINUX_SYMBOL(__sched_text_end) = .;
 387
 388 /* spinlock.text is aling to function alignment to secure we have same
 389  * address even at second ld pass when generating System.map */
 390 #define LOCK_TEXT                                                       \
 391                 ALIGN_FUNCTION();                                       \
 392                 VMLINUX_SYMBOL(__lock_text_start) = .;                  \
 393                 *(.spinlock.text)                                       \
 394                 VMLINUX_SYMBOL(__lock_text_end) = .;
 395
 396 #define KPROBES_TEXT                                                    \
 397                 ALIGN_FUNCTION();                                       \
 398                 VMLINUX_SYMBOL(__kprobes_text_start) = .;               \
 399                 *(.kprobes.text)                                        \
 400                 VMLINUX_SYMBOL(__kprobes_text_end) = .;
 401
 402 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 403 #define IRQENTRY_TEXT                                                   \
 404                 ALIGN_FUNCTION();                                       \
 405                 VMLINUX_SYMBOL(__irqentry_text_start) = .;              \
 406                 *(.irqentry.text)                                       \
 407                 VMLINUX_SYMBOL(__irqentry_text_end) = .;
 408 #else
 409 #define IRQENTRY_TEXT
 410 #endif
 411
 412 /* Section used for early init (in .S files) */
 413 #define HEAD_TEXT  *(.head.text)
 414
 415 #define HEAD_TEXT_SECTION                                                       \
 416         .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {               \
 417                 HEAD_TEXT                                               \
 418         }
 419
 420 /*
 421  * Exception table
 422  */
 423 #define EXCEPTION_TABLE(align)                                          \
 424         . = ALIGN(align);                                               \
 425         __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {               \
 426                 VMLINUX_SYMBOL(__start___ex_table) = .;                 \
 427                 *(__ex_table)                                           \
 428                 VMLINUX_SYMBOL(__stop___ex_table) = .;                  \
 429         }
 430
 431 /*
 432  * Init task
 433  */
 434 #define INIT_TASK_DATA_SECTION(align)                                   \
 435         . = ALIGN(align);                                               \
 436         .data.init_task : {                                             \
 437                 INIT_TASK_DATA(align)                                   \
 438         }
 439
 440 #ifdef CONFIG_CONSTRUCTORS
 441 #define KERNEL_CTORS()  . = ALIGN(8);                      \
 442                         VMLINUX_SYMBOL(__ctors_start) = .; \
 443                         *(.ctors)                          \
 444                         VMLINUX_SYMBOL(__ctors_end) = .;
 445 #else
 446 #define KERNEL_CTORS()
 447 #endif
 448
 449 /* init and exit section handling */
 450 #define INIT_DATA                                                       \
 451         *(.init.data)                                                   \
 452         DEV_DISCARD(init.data)                                          \
 453         CPU_DISCARD(init.data)                                          \
 454         MEM_DISCARD(init.data)                                          \
 455         KERNEL_CTORS()                                                  \
 456         *(.init.rodata)                                                 \
 457         MCOUNT_REC()                                                    \
 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  * Default discarded sections.
 631  *
 632  * Some archs want to discard exit text/data at runtime rather than
 633  * link time due to cross-section references such as alt instructions,
 634  * bug table, eh_frame, etc.  DISCARDS must be the last of output
 635  * section definitions so that such archs put those in earlier section
 636  * definitions.
 637  */
 638 #define DISCARDS                                                        \
 639         /DISCARD/ : {                                                   \
 640         EXIT_TEXT                                                       \
 641         EXIT_DATA                                                       \
 642         EXIT_CALL                                                       \
 643         *(.discard)                                                     \
 644         }
 645
 646 /**
 647  * PERCPU_VADDR - define output section for percpu area
 648  * @vaddr: explicit base address (optional)
 649  * @phdr: destination PHDR (optional)
 650  *
 651  * Macro which expands to output section for percpu area.  If @vaddr
 652  * is not blank, it specifies explicit base address and all percpu
 653  * symbols will be offset from the given address.  If blank, @vaddr
 654  * always equals @laddr + LOAD_OFFSET.
 655  *
 656  * @phdr defines the output PHDR to use if not blank.  Be warned that
 657  * output PHDR is sticky.  If @phdr is specified, the next output
 658  * section in the linker script will go there too.  @phdr should have
 659  * a leading colon.
 660  *
 661  * Note that this macros defines __per_cpu_load as an absolute symbol.
 662  * If there is no need to put the percpu section at a predetermined
 663  * address, use PERCPU().
 664  */
 665 #define PERCPU_VADDR(vaddr, phdr)                                       \
 666         VMLINUX_SYMBOL(__per_cpu_load) = .;                             \
 667         .data.percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load)          \
 668                                 - LOAD_OFFSET) {                        \
 669                 VMLINUX_SYMBOL(__per_cpu_start) = .;                    \
 670                 *(.data.percpu.first)                                   \
 671                 *(.data.percpu.page_aligned)                            \
 672                 *(.data.percpu)                                         \
 673                 *(.data.percpu.shared_aligned)                          \
 674                 VMLINUX_SYMBOL(__per_cpu_end) = .;                      \
 675         } phdr                                                          \
 676         . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data.percpu);
 677
 678 /**
 679  * PERCPU - define output section for percpu area, simple version
 680  * @align: required alignment
 681  *
 682  * Align to @align and outputs output section for percpu area.  This
 683  * macro doesn't maniuplate @vaddr or @phdr and __per_cpu_load and
 684  * __per_cpu_start will be identical.
 685  *
 686  * This macro is equivalent to ALIGN(align); PERCPU_VADDR( , ) except
 687  * that __per_cpu_load is defined as a relative symbol against
 688  * .data.percpu which is required for relocatable x86_32
 689  * configuration.
 690  */
 691 #define PERCPU(align)                                                   \
 692         . = ALIGN(align);                                               \
 693         .data.percpu    : AT(ADDR(.data.percpu) - LOAD_OFFSET) {        \
 694                 VMLINUX_SYMBOL(__per_cpu_load) = .;                     \
 695                 VMLINUX_SYMBOL(__per_cpu_start) = .;                    \
 696                 *(.data.percpu.first)                                   \
 697                 *(.data.percpu.page_aligned)                            \
 698                 *(.data.percpu)                                         \
 699                 *(.data.percpu.shared_aligned)                          \
 700                 VMLINUX_SYMBOL(__per_cpu_end) = .;                      \
 701         }
 702
 703
 704 /*
 705  * Definition of the high level *_SECTION macros
 706  * They will fit only a subset of the architectures
 707  */
 708
 709
 710 /*
 711  * Writeable data.
 712  * All sections are combined in a single .data section.
 713  * The sections following CONSTRUCTORS are arranged so their
 714  * typical alignment matches.
 715  * A cacheline is typical/always less than a PAGE_SIZE so
 716  * the sections that has this restriction (or similar)
 717  * is located before the ones requiring PAGE_SIZE alignment.
 718  * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
 719  * matches the requirment of PAGE_ALIGNED_DATA.
 720  *
 721  * use 0 as page_align if page_aligned data is not used */
 722 #define RW_DATA_SECTION(cacheline, pagealigned, inittask)               \
 723         . = ALIGN(PAGE_SIZE);                                           \
 724         .data : AT(ADDR(.data) - LOAD_OFFSET) {                         \
 725                 INIT_TASK_DATA(inittask)                                \
 726                 NOSAVE_DATA                                             \
 727                 PAGE_ALIGNED_DATA(pagealigned)                          \
 728                 CACHELINE_ALIGNED_DATA(cacheline)                       \
 729                 READ_MOSTLY_DATA(cacheline)                             \
 730                 DATA_DATA                                               \
 731                 CONSTRUCTORS                                            \
 732         }
 733
 734 #define INIT_TEXT_SECTION(inittext_align)                               \
 735         . = ALIGN(inittext_align);                                      \
 736         .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {               \
 737                 VMLINUX_SYMBOL(_sinittext) = .;                         \
 738                 INIT_TEXT                                               \
 739                 VMLINUX_SYMBOL(_einittext) = .;                         \
 740         }
 741
 742 #define INIT_DATA_SECTION(initsetup_align)                              \
 743         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {               \
 744                 INIT_DATA                                               \
 745                 INIT_SETUP(initsetup_align)                             \
 746                 INIT_CALLS                                              \
 747                 CON_INITCALL                                            \
 748                 SECURITY_INITCALL                                       \
 749                 INIT_RAM_FS                                             \
 750         }
 751
 752 #define BSS_SECTION(sbss_align, bss_align, stop_align)                  \
 753         . = ALIGN(sbss_align);                                          \
 754         VMLINUX_SYMBOL(__bss_start) = .;                                \
 755         SBSS(sbss_align)                                                \
 756         BSS(bss_align)                                                  \
 757         . = ALIGN(stop_align);                                          \
 758         VMLINUX_SYMBOL(__bss_stop) = .;
 759
 760 #ifdef CONFIG_STACK_UNWIND
 761 #define EH_FRAME                                                        \
 762                 /* Unwind data binary search table */                   \
 763                 . = ALIGN(8);                                           \
 764                 .eh_frame_hdr : AT(ADDR(.eh_frame_hdr) - LOAD_OFFSET) { \
 765                         VMLINUX_SYMBOL(__start_unwind_hdr) = .;         \
 766                         *(.eh_frame_hdr)                                \
 767                         VMLINUX_SYMBOL(__end_unwind_hdr) = .;           \
 768                 }                                                       \
 769                 /* Unwind data */                                       \
 770                 . = ALIGN(8);                                           \
 771                 .eh_frame : AT(ADDR(.eh_frame) - LOAD_OFFSET) {         \
 772                         VMLINUX_SYMBOL(__start_unwind) = .;             \
 773                         *(.eh_frame)                                    \
 774                         VMLINUX_SYMBOL(__end_unwind) = .;               \
 775                 }
 776 #else
 777 #define EH_FRAME
 778 #endif