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_SECTION(CACHELINE_SIZE)
  19  *      __init_end = .;
  20  *
  21  *      _stext = .;
  22  *      TEXT_SECTION = 0
  23  *      _etext = .;
  24  *
  25  *      _sdata = .;
  26  *      RO_DATA_SECTION(PAGE_SIZE)
  27  *      RW_DATA_SECTION(...)
  28  *      _edata = .;
  29  *
  30  *      EXCEPTION_TABLE(...)
  31  *      NOTES
  32  *
  33  *      BSS_SECTION(0, 0, 0)
  34  *      _end = .;
  35  *
  36  *      STABS_DEBUG
  37  *      DWARF_DEBUG
  38  *
  39  *      DISCARDS                // must be the last
  40  * }
  41  *
  42  * [__init_begin, __init_end] is the init section that may be freed after init
  43  * [_stext, _etext] is the text section
  44  * [_sdata, _edata] is the data section
  45  *
  46  * Some of the included output section have their own set of constants.
  47  * Examples are: [__initramfs_start, __initramfs_end] for initramfs and
  48  *               [__nosave_begin, __nosave_end] for the nosave data
  49  */
  50
  51 #ifndef LOAD_OFFSET
  52 #define LOAD_OFFSET 0
  53 #endif
  54
  55 #ifndef SYMBOL_PREFIX
  56 #define VMLINUX_SYMBOL(sym) sym
  57 #else
  58 #define PASTE2(x,y) x##y
  59 #define PASTE(x,y) PASTE2(x,y)
  60 #define VMLINUX_SYMBOL(sym) PASTE(SYMBOL_PREFIX, sym)
  61 #endif
  62
  63 /* Align . to a 8 byte boundary equals to maximum function alignment. */
  64 #define ALIGN_FUNCTION()  . = ALIGN(8)
  65
  66 /*
  67  * Align to a 32 byte boundary equal to the
  68  * alignment gcc 4.5 uses for a struct
  69  */
  70 #define STRUCT_ALIGNMENT 32
  71 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
  72
  73 /* The actual configuration determine if the init/exit sections
  74  * are handled as text/data or they can be discarded (which
  75  * often happens at runtime)
  76  */
  77 #ifdef CONFIG_HOTPLUG
  78 #define DEV_KEEP(sec)    *(.dev##sec)
  79 #define DEV_DISCARD(sec)
  80 #else
  81 #define DEV_KEEP(sec)
  82 #define DEV_DISCARD(sec) *(.dev##sec)
  83 #endif
  84
  85 #ifdef CONFIG_HOTPLUG_CPU
  86 #define CPU_KEEP(sec)    *(.cpu##sec)
  87 #define CPU_DISCARD(sec)
  88 #else
  89 #define CPU_KEEP(sec)
  90 #define CPU_DISCARD(sec) *(.cpu##sec)
  91 #endif
  92
  93 #if defined(CONFIG_MEMORY_HOTPLUG)
  94 #define MEM_KEEP(sec)    *(.mem##sec)
  95 #define MEM_DISCARD(sec)
  96 #else
  97 #define MEM_KEEP(sec)
  98 #define MEM_DISCARD(sec) *(.mem##sec)
  99 #endif
 100
 101 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
 102 #define MCOUNT_REC()    . = ALIGN(8);                           \
 103                         VMLINUX_SYMBOL(__start_mcount_loc) = .; \
 104                         *(__mcount_loc)                         \
 105                         VMLINUX_SYMBOL(__stop_mcount_loc) = .;
 106 #else
 107 #define MCOUNT_REC()
 108 #endif
 109
 110 #ifdef CONFIG_TRACE_BRANCH_PROFILING
 111 #define LIKELY_PROFILE()        VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \
 112                                 *(_ftrace_annotated_branch)                           \
 113                                 VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .;
 114 #else
 115 #define LIKELY_PROFILE()
 116 #endif
 117
 118 #ifdef CONFIG_PROFILE_ALL_BRANCHES
 119 #define BRANCH_PROFILE()        VMLINUX_SYMBOL(__start_branch_profile) = .;   \
 120                                 *(_ftrace_branch)                             \
 121                                 VMLINUX_SYMBOL(__stop_branch_profile) = .;
 122 #else
 123 #define BRANCH_PROFILE()
 124 #endif
 125
 126 #ifdef CONFIG_EVENT_TRACING
 127 #define FTRACE_EVENTS() . = ALIGN(8);                                   \
 128                         VMLINUX_SYMBOL(__start_ftrace_events) = .;      \
 129                         *(_ftrace_events)                               \
 130                         VMLINUX_SYMBOL(__stop_ftrace_events) = .;
 131 #else
 132 #define FTRACE_EVENTS()
 133 #endif
 134
 135 #ifdef CONFIG_TRACING
 136 #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .;      \
 137                          *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \
 138                          VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;
 139 #else
 140 #define TRACE_PRINTKS()
 141 #endif
 142
 143 #ifdef CONFIG_FTRACE_SYSCALLS
 144 #define TRACE_SYSCALLS() . = ALIGN(8);                                  \
 145                          VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \
 146                          *(__syscalls_metadata)                         \
 147                          VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
 148 #else
 149 #define TRACE_SYSCALLS()
 150 #endif
 151
 152
 153 #ifdef CONFIG_COMMON_CLK
 154 #define CLK_OF_TABLES() . = ALIGN(8);                           \
 155                         VMLINUX_SYMBOL(__clk_of_table) = .;     \
 156                         *(__clk_of_table)                       \
 157                         *(__clk_of_table_end)
 158 #else
 159 #define CLK_OF_TABLES()
 160 #endif
 161
 162 #define KERNEL_DTB()                                                    \
 163         STRUCT_ALIGN();                                                 \
 164         VMLINUX_SYMBOL(__dtb_start) = .;                                \
 165         *(.dtb.init.rodata)                                             \
 166         VMLINUX_SYMBOL(__dtb_end) = .;
 167
 168 /* .data section */
 169 #define DATA_DATA                                                       \
 170         *(.data)                                                        \
 171         *(.ref.data)                                                    \
 172         *(.data..shared_aligned) /* percpu related */                   \
 173         DEV_KEEP(init.data)                                             \
 174         DEV_KEEP(exit.data)                                             \
 175         CPU_KEEP(init.data)                                             \
 176         CPU_KEEP(exit.data)                                             \
 177         MEM_KEEP(init.data)                                             \
 178         MEM_KEEP(exit.data)                                             \
 179         *(.data.unlikely)                                               \
 180         STRUCT_ALIGN();                                                 \
 181         *(__tracepoints)                                                \
 182         /* implement dynamic printk debug */                            \
 183         . = ALIGN(8);                                                   \
 184         VMLINUX_SYMBOL(__start___jump_table) = .;                       \
 185         *(__jump_table)                                                 \
 186         VMLINUX_SYMBOL(__stop___jump_table) = .;                        \
 187         . = ALIGN(8);                                                   \
 188         VMLINUX_SYMBOL(__start___verbose) = .;                          \
 189         *(__verbose)                                                    \
 190         VMLINUX_SYMBOL(__stop___verbose) = .;                           \
 191         LIKELY_PROFILE()                                                \
 192         BRANCH_PROFILE()                                                \
 193         TRACE_PRINTKS()
 194
 195 /*
 196  * Data section helpers
 197  */
 198 #define NOSAVE_DATA                                                     \
 199         . = ALIGN(PAGE_SIZE);                                           \
 200         VMLINUX_SYMBOL(__nosave_begin) = .;                             \
 201         *(.data..nosave)                                                \
 202         . = ALIGN(PAGE_SIZE);                                           \
 203         VMLINUX_SYMBOL(__nosave_end) = .;
 204
 205 #define PAGE_ALIGNED_DATA(page_align)                                   \
 206         . = ALIGN(page_align);                                          \
 207         *(.data..page_aligned)
 208
 209 #define READ_MOSTLY_DATA(align)                                         \
 210         . = ALIGN(align);                                               \
 211         *(.data..read_mostly)                                           \
 212         . = ALIGN(align);
 213
 214 #define CACHELINE_ALIGNED_DATA(align)                                   \
 215         . = ALIGN(align);                                               \
 216         *(.data..cacheline_aligned)
 217
 218 #define INIT_TASK_DATA(align)                                           \
 219         . = ALIGN(align);                                               \
 220         *(.data..init_task)
 221
 222 /*
 223  * Read only Data
 224  */
 225 #define RO_DATA_SECTION(align)                                          \
 226         . = ALIGN((align));                                             \
 227         .rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {           \
 228                 VMLINUX_SYMBOL(__start_rodata) = .;                     \
 229                 *(.rodata) *(.rodata.*)                                 \
 230                 *(__vermagic)           /* Kernel version magic */      \
 231                 . = ALIGN(8);                                           \
 232                 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .;         \
 233                 *(__tracepoints_ptrs)   /* Tracepoints: pointer array */\
 234                 VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .;          \
 235                 *(__tracepoints_strings)/* Tracepoints: strings */      \
 236         }                                                               \
 237                                                                         \
 238         .rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {          \
 239                 *(.rodata1)                                             \
 240         }                                                               \
 241                                                                         \
 242         BUG_TABLE                                                       \
 243                                                                         \
 244         /* PCI quirks */                                                \
 245         .pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {        \
 246                 VMLINUX_SYMBOL(__start_pci_fixups_early) = .;           \
 247                 *(.pci_fixup_early)                                     \
 248                 VMLINUX_SYMBOL(__end_pci_fixups_early) = .;             \
 249                 VMLINUX_SYMBOL(__start_pci_fixups_header) = .;          \
 250                 *(.pci_fixup_header)                                    \
 251                 VMLINUX_SYMBOL(__end_pci_fixups_header) = .;            \
 252                 VMLINUX_SYMBOL(__start_pci_fixups_final) = .;           \
 253                 *(.pci_fixup_final)                                     \
 254                 VMLINUX_SYMBOL(__end_pci_fixups_final) = .;             \
 255                 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .;          \
 256                 *(.pci_fixup_enable)                                    \
 257                 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .;            \
 258                 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .;          \
 259                 *(.pci_fixup_resume)                                    \
 260                 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .;            \
 261                 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .;    \
 262                 *(.pci_fixup_resume_early)                              \
 263                 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .;      \
 264                 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .;         \
 265                 *(.pci_fixup_suspend)                                   \
 266                 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .;           \
 267         }                                                               \
 268                                                                         \
 269         /* Built-in firmware blobs */                                   \
 270         .builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {      \
 271                 VMLINUX_SYMBOL(__start_builtin_fw) = .;                 \
 272                 *(.builtin_fw)                                          \
 273                 VMLINUX_SYMBOL(__end_builtin_fw) = .;                   \
 274         }                                                               \
 275                                                                         \
 276         /* RapidIO route ops */                                         \
 277         .rio_ops        : AT(ADDR(.rio_ops) - LOAD_OFFSET) {            \
 278                 VMLINUX_SYMBOL(__start_rio_switch_ops) = .;             \
 279                 *(.rio_switch_ops)                                      \
 280                 VMLINUX_SYMBOL(__end_rio_switch_ops) = .;               \
 281         }                                                               \
 282                                                                         \
 283         TRACEDATA                                                       \
 284                                                                         \
 285         /* Kernel symbol table: Normal symbols */                       \
 286         __ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {         \
 287                 VMLINUX_SYMBOL(__start___ksymtab) = .;                  \
 288                 *(SORT(___ksymtab+*))                                   \
 289                 VMLINUX_SYMBOL(__stop___ksymtab) = .;                   \
 290         }                                                               \
 291                                                                         \
 292         /* Kernel symbol table: GPL-only symbols */                     \
 293         __ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {     \
 294                 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .;              \
 295                 *(SORT(___ksymtab_gpl+*))                               \
 296                 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .;               \
 297         }                                                               \
 298                                                                         \
 299         /* Kernel symbol table: Normal unused symbols */                \
 300         __ksymtab_unused  : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) {  \
 301                 VMLINUX_SYMBOL(__start___ksymtab_unused) = .;           \
 302                 *(SORT(___ksymtab_unused+*))                            \
 303                 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .;            \
 304         }                                                               \
 305                                                                         \
 306         /* Kernel symbol table: GPL-only unused symbols */              \
 307         __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
 308                 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .;       \
 309                 *(SORT(___ksymtab_unused_gpl+*))                        \
 310                 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .;        \
 311         }                                                               \
 312                                                                         \
 313         /* Kernel symbol table: GPL-future-only symbols */              \
 314         __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
 315                 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .;       \
 316                 *(SORT(___ksymtab_gpl_future+*))                        \
 317                 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .;        \
 318         }                                                               \
 319                                                                         \
 320         /* Kernel symbol table: Normal symbols */                       \
 321         __kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {         \
 322                 VMLINUX_SYMBOL(__start___kcrctab) = .;                  \
 323                 *(SORT(___kcrctab+*))                                   \
 324                 VMLINUX_SYMBOL(__stop___kcrctab) = .;                   \
 325         }                                                               \
 326                                                                         \
 327         /* Kernel symbol table: GPL-only symbols */                     \
 328         __kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {     \
 329                 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .;              \
 330                 *(SORT(___kcrctab_gpl+*))                               \
 331                 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .;               \
 332         }                                                               \
 333                                                                         \
 334         /* Kernel symbol table: Normal unused symbols */                \
 335         __kcrctab_unused  : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) {  \
 336                 VMLINUX_SYMBOL(__start___kcrctab_unused) = .;           \
 337                 *(SORT(___kcrctab_unused+*))                            \
 338                 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .;            \
 339         }                                                               \
 340                                                                         \
 341         /* Kernel symbol table: GPL-only unused symbols */              \
 342         __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
 343                 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .;       \
 344                 *(SORT(___kcrctab_unused_gpl+*))                        \
 345                 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .;        \
 346         }                                                               \
 347                                                                         \
 348         /* Kernel symbol table: GPL-future-only symbols */              \
 349         __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
 350                 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .;       \
 351                 *(SORT(___kcrctab_gpl_future+*))                        \
 352                 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .;        \
 353         }                                                               \
 354                                                                         \
 355         /* Kernel symbol table: strings */                              \
 356         __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
 357                 *(__ksymtab_strings)                                    \
 358         }                                                               \
 359                                                                         \
 360         /* __*init sections */                                          \
 361         __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {         \
 362                 *(.ref.rodata)                                          \
 363                 DEV_KEEP(init.rodata)                                   \
 364                 DEV_KEEP(exit.rodata)                                   \
 365                 CPU_KEEP(init.rodata)                                   \
 366                 CPU_KEEP(exit.rodata)                                   \
 367                 MEM_KEEP(init.rodata)                                   \
 368                 MEM_KEEP(exit.rodata)                                   \
 369         }                                                               \
 370                                                                         \
 371         /* Built-in module parameters. */                               \
 372         __param : AT(ADDR(__param) - LOAD_OFFSET) {                     \
 373                 VMLINUX_SYMBOL(__start___param) = .;                    \
 374                 *(__param)                                              \
 375                 VMLINUX_SYMBOL(__stop___param) = .;                     \
 376         }                                                               \
 377                                                                         \
 378         /* Built-in module versions. */                                 \
 379         __modver : AT(ADDR(__modver) - LOAD_OFFSET) {                   \
 380                 VMLINUX_SYMBOL(__start___modver) = .;                   \
 381                 *(__modver)                                             \
 382                 VMLINUX_SYMBOL(__stop___modver) = .;                    \
 383                 . = ALIGN((align));                                     \
 384                 VMLINUX_SYMBOL(__end_rodata) = .;                       \
 385         }                                                               \
 386         . = ALIGN((align));
 387
 388 /* RODATA & RO_DATA provided for backward compatibility.
 389  * All archs are supposed to use RO_DATA() */
 390 #define RODATA          RO_DATA_SECTION(4096)
 391 #define RO_DATA(align)  RO_DATA_SECTION(align)
 392
 393 #define SECURITY_INIT                                                   \
 394         .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
 395                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 396                 *(.security_initcall.init)                              \
 397                 VMLINUX_SYMBOL(__security_initcall_end) = .;            \
 398         }
 399
 400 /* .text section. Map to function alignment to avoid address changes
 401  * during second ld run in second ld pass when generating System.map */
 402 #define TEXT_TEXT                                                       \
 403                 ALIGN_FUNCTION();                                       \
 404                 *(.text.hot)                                            \
 405                 *(.text)                                                \
 406                 *(.ref.text)                                            \
 407         DEV_KEEP(init.text)                                             \
 408         DEV_KEEP(exit.text)                                             \
 409         CPU_KEEP(init.text)                                             \
 410         CPU_KEEP(exit.text)                                             \
 411         MEM_KEEP(init.text)                                             \
 412         MEM_KEEP(exit.text)                                             \
 413                 *(.text.unlikely)
 414
 415
 416 /* sched.text is aling to function alignment to secure we have same
 417  * address even at second ld pass when generating System.map */
 418 #define SCHED_TEXT                                                      \
 419                 ALIGN_FUNCTION();                                       \
 420                 VMLINUX_SYMBOL(__sched_text_start) = .;                 \
 421                 *(.sched.text)                                          \
 422                 VMLINUX_SYMBOL(__sched_text_end) = .;
 423
 424 /* spinlock.text is aling to function alignment to secure we have same
 425  * address even at second ld pass when generating System.map */
 426 #define LOCK_TEXT                                                       \
 427                 ALIGN_FUNCTION();                                       \
 428                 VMLINUX_SYMBOL(__lock_text_start) = .;                  \
 429                 *(.spinlock.text)                                       \
 430                 VMLINUX_SYMBOL(__lock_text_end) = .;
 431
 432 #define KPROBES_TEXT                                                    \
 433                 ALIGN_FUNCTION();                                       \
 434                 VMLINUX_SYMBOL(__kprobes_text_start) = .;               \
 435                 *(.kprobes.text)                                        \
 436                 VMLINUX_SYMBOL(__kprobes_text_end) = .;
 437
 438 #define ENTRY_TEXT                                                      \
 439                 ALIGN_FUNCTION();                                       \
 440                 VMLINUX_SYMBOL(__entry_text_start) = .;                 \
 441                 *(.entry.text)                                          \
 442                 VMLINUX_SYMBOL(__entry_text_end) = .;
 443
 444 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 445 #define IRQENTRY_TEXT                                                   \
 446                 ALIGN_FUNCTION();                                       \
 447                 VMLINUX_SYMBOL(__irqentry_text_start) = .;              \
 448                 *(.irqentry.text)                                       \
 449                 VMLINUX_SYMBOL(__irqentry_text_end) = .;
 450 #else
 451 #define IRQENTRY_TEXT
 452 #endif
 453
 454 /* Section used for early init (in .S files) */
 455 #define HEAD_TEXT  *(.head.text)
 456
 457 #define HEAD_TEXT_SECTION                                                       \
 458         .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {               \
 459                 HEAD_TEXT                                               \
 460         }
 461
 462 /*
 463  * Exception table
 464  */
 465 #define EXCEPTION_TABLE(align)                                          \
 466         . = ALIGN(align);                                               \
 467         __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {               \
 468                 VMLINUX_SYMBOL(__start___ex_table) = .;                 \
 469                 *(__ex_table)                                           \
 470                 VMLINUX_SYMBOL(__stop___ex_table) = .;                  \
 471         }
 472
 473 /*
 474  * Init task
 475  */
 476 #define INIT_TASK_DATA_SECTION(align)                                   \
 477         . = ALIGN(align);                                               \
 478         .data..init_task :  AT(ADDR(.data..init_task) - LOAD_OFFSET) {  \
 479                 INIT_TASK_DATA(align)                                   \
 480         }
 481
 482 #ifdef CONFIG_CONSTRUCTORS
 483 #define KERNEL_CTORS()  . = ALIGN(8);                      \
 484                         VMLINUX_SYMBOL(__ctors_start) = .; \
 485                         *(.ctors)                          \
 486                         VMLINUX_SYMBOL(__ctors_end) = .;
 487 #else
 488 #define KERNEL_CTORS()
 489 #endif
 490
 491 /* init and exit section handling */
 492 #define INIT_DATA                                                       \
 493         *(.init.data)                                                   \
 494         DEV_DISCARD(init.data)                                          \
 495         CPU_DISCARD(init.data)                                          \
 496         MEM_DISCARD(init.data)                                          \
 497         KERNEL_CTORS()                                                  \
 498         MCOUNT_REC()                                                    \
 499         *(.init.rodata)                                                 \
 500         FTRACE_EVENTS()                                                 \
 501         TRACE_SYSCALLS()                                                \
 502         DEV_DISCARD(init.rodata)                                        \
 503         CPU_DISCARD(init.rodata)                                        \
 504         MEM_DISCARD(init.rodata)                                        \
 505         CLK_OF_TABLES()                                                 \
 506         KERNEL_DTB()
 507
 508 #define INIT_TEXT                                                       \
 509         *(.init.text)                                                   \
 510         DEV_DISCARD(init.text)                                          \
 511         CPU_DISCARD(init.text)                                          \
 512         MEM_DISCARD(init.text)
 513
 514 #define EXIT_DATA                                                       \
 515         *(.exit.data)                                                   \
 516         DEV_DISCARD(exit.data)                                          \
 517         DEV_DISCARD(exit.rodata)                                        \
 518         CPU_DISCARD(exit.data)                                          \
 519         CPU_DISCARD(exit.rodata)                                        \
 520         MEM_DISCARD(exit.data)                                          \
 521         MEM_DISCARD(exit.rodata)
 522
 523 #define EXIT_TEXT                                                       \
 524         *(.exit.text)                                                   \
 525         DEV_DISCARD(exit.text)                                          \
 526         CPU_DISCARD(exit.text)                                          \
 527         MEM_DISCARD(exit.text)
 528
 529 #define EXIT_CALL                                                       \
 530         *(.exitcall.exit)
 531
 532 /*
 533  * bss (Block Started by Symbol) - uninitialized data
 534  * zeroed during startup
 535  */
 536 #define SBSS(sbss_align)                                                \
 537         . = ALIGN(sbss_align);                                          \
 538         .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {                         \
 539                 *(.sbss)                                                \
 540                 *(.scommon)                                             \
 541         }
 542
 543 /*
 544  * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
 545  * sections to the front of bss.
 546  */
 547 #ifndef BSS_FIRST_SECTIONS
 548 #define BSS_FIRST_SECTIONS
 549 #endif
 550
 551 #define BSS(bss_align)                                                  \
 552         . = ALIGN(bss_align);                                           \
 553         .bss : AT(ADDR(.bss) - LOAD_OFFSET) {                           \
 554                 BSS_FIRST_SECTIONS                                      \
 555                 *(.bss..page_aligned)                                   \
 556                 *(.dynbss)                                              \
 557                 *(.bss)                                                 \
 558                 *(COMMON)                                               \
 559         }
 560
 561 /*
 562  * DWARF debug sections.
 563  * Symbols in the DWARF debugging sections are relative to
 564  * the beginning of the section so we begin them at 0.
 565  */
 566 #define DWARF_DEBUG                                                     \
 567                 /* DWARF 1 */                                           \
 568                 .debug          0 : { *(.debug) }                       \
 569                 .line           0 : { *(.line) }                        \
 570                 /* GNU DWARF 1 extensions */                            \
 571                 .debug_srcinfo  0 : { *(.debug_srcinfo) }               \
 572                 .debug_sfnames  0 : { *(.debug_sfnames) }               \
 573                 /* DWARF 1.1 and DWARF 2 */                             \
 574                 .debug_aranges  0 : { *(.debug_aranges) }               \
 575                 .debug_pubnames 0 : { *(.debug_pubnames) }              \
 576                 /* DWARF 2 */                                           \
 577                 .debug_info     0 : { *(.debug_info                     \
 578                                 .gnu.linkonce.wi.*) }                   \
 579                 .debug_abbrev   0 : { *(.debug_abbrev) }                \
 580                 .debug_line     0 : { *(.debug_line) }                  \
 581                 .debug_frame    0 : { *(.debug_frame) }                 \
 582                 .debug_str      0 : { *(.debug_str) }                   \
 583                 .debug_loc      0 : { *(.debug_loc) }                   \
 584                 .debug_macinfo  0 : { *(.debug_macinfo) }               \
 585                 /* SGI/MIPS DWARF 2 extensions */                       \
 586                 .debug_weaknames 0 : { *(.debug_weaknames) }            \
 587                 .debug_funcnames 0 : { *(.debug_funcnames) }            \
 588                 .debug_typenames 0 : { *(.debug_typenames) }            \
 589                 .debug_varnames  0 : { *(.debug_varnames) }             \
 590
 591                 /* Stabs debugging sections.  */
 592 #define STABS_DEBUG                                                     \
 593                 .stab 0 : { *(.stab) }                                  \
 594                 .stabstr 0 : { *(.stabstr) }                            \
 595                 .stab.excl 0 : { *(.stab.excl) }                        \
 596                 .stab.exclstr 0 : { *(.stab.exclstr) }                  \
 597                 .stab.index 0 : { *(.stab.index) }                      \
 598                 .stab.indexstr 0 : { *(.stab.indexstr) }                \
 599                 .comment 0 : { *(.comment) }
 600
 601 #ifdef CONFIG_GENERIC_BUG
 602 #define BUG_TABLE                                                       \
 603         . = ALIGN(8);                                                   \
 604         __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {             \
 605                 VMLINUX_SYMBOL(__start___bug_table) = .;                \
 606                 *(__bug_table)                                          \
 607                 VMLINUX_SYMBOL(__stop___bug_table) = .;                 \
 608         }
 609 #else
 610 #define BUG_TABLE
 611 #endif
 612
 613 #ifdef CONFIG_PM_TRACE
 614 #define TRACEDATA                                                       \
 615         . = ALIGN(4);                                                   \
 616         .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {               \
 617                 VMLINUX_SYMBOL(__tracedata_start) = .;                  \
 618                 *(.tracedata)                                           \
 619                 VMLINUX_SYMBOL(__tracedata_end) = .;                    \
 620         }
 621 #else
 622 #define TRACEDATA
 623 #endif
 624
 625 #define NOTES                                                           \
 626         .notes : AT(ADDR(.notes) - LOAD_OFFSET) {                       \
 627                 VMLINUX_SYMBOL(__start_notes) = .;                      \
 628                 *(.note.*)                                              \
 629                 VMLINUX_SYMBOL(__stop_notes) = .;                       \
 630         }
 631
 632 #define INIT_SETUP(initsetup_align)                                     \
 633                 . = ALIGN(initsetup_align);                             \
 634                 VMLINUX_SYMBOL(__setup_start) = .;                      \
 635                 *(.init.setup)                                          \
 636                 VMLINUX_SYMBOL(__setup_end) = .;
 637
 638 #define INIT_CALLS_LEVEL(level)                                         \
 639                 VMLINUX_SYMBOL(__initcall##level##_start) = .;          \
 640                 *(.initcall##level##.init)                              \
 641                 *(.initcall##level##s.init)                             \
 642
 643 #define INIT_CALLS                                                      \
 644                 VMLINUX_SYMBOL(__initcall_start) = .;                   \
 645                 *(.initcallearly.init)                                  \
 646                 INIT_CALLS_LEVEL(0)                                     \
 647                 INIT_CALLS_LEVEL(1)                                     \
 648                 INIT_CALLS_LEVEL(2)                                     \
 649                 INIT_CALLS_LEVEL(3)                                     \
 650                 INIT_CALLS_LEVEL(4)                                     \
 651                 INIT_CALLS_LEVEL(5)                                     \
 652                 INIT_CALLS_LEVEL(rootfs)                                \
 653                 INIT_CALLS_LEVEL(6)                                     \
 654                 INIT_CALLS_LEVEL(7)                                     \
 655                 VMLINUX_SYMBOL(__initcall_end) = .;
 656
 657 #define CON_INITCALL                                                    \
 658                 VMLINUX_SYMBOL(__con_initcall_start) = .;               \
 659                 *(.con_initcall.init)                                   \
 660                 VMLINUX_SYMBOL(__con_initcall_end) = .;
 661
 662 #define SECURITY_INITCALL                                               \
 663                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 664                 *(.security_initcall.init)                              \
 665                 VMLINUX_SYMBOL(__security_initcall_end) = .;
 666
 667 #ifdef CONFIG_BLK_DEV_INITRD
 668 #define INIT_RAM_FS                                                     \
 669         . = ALIGN(4);                                                   \
 670         VMLINUX_SYMBOL(__initramfs_start) = .;                          \
 671         *(.init.ramfs)                                                  \
 672         . = ALIGN(8);                                                   \
 673         *(.init.ramfs.info)
 674 #else
 675 #define INIT_RAM_FS
 676 #endif
 677
 678 /*
 679  * Default discarded sections.
 680  *
 681  * Some archs want to discard exit text/data at runtime rather than
 682  * link time due to cross-section references such as alt instructions,
 683  * bug table, eh_frame, etc.  DISCARDS must be the last of output
 684  * section definitions so that such archs put those in earlier section
 685  * definitions.
 686  */
 687 #define DISCARDS                                                        \
 688         /DISCARD/ : {                                                   \
 689         EXIT_TEXT                                                       \
 690         EXIT_DATA                                                       \
 691         EXIT_CALL                                                       \
 692         *(.discard)                                                     \
 693         *(.discard.*)                                                   \
 694         }
 695
 696 /**
 697  * PERCPU_INPUT - the percpu input sections
 698  * @cacheline: cacheline size
 699  *
 700  * The core percpu section names and core symbols which do not rely
 701  * directly upon load addresses.
 702  *
 703  * @cacheline is used to align subsections to avoid false cacheline
 704  * sharing between subsections for different purposes.
 705  */
 706 #define PERCPU_INPUT(cacheline)                                         \
 707         VMLINUX_SYMBOL(__per_cpu_start) = .;                            \
 708         *(.data..percpu..first)                                         \
 709         . = ALIGN(PAGE_SIZE);                                           \
 710         *(.data..percpu..page_aligned)                                  \
 711         . = ALIGN(cacheline);                                           \
 712         *(.data..percpu..readmostly)                                    \
 713         . = ALIGN(cacheline);                                           \
 714         *(.data..percpu)                                                \
 715         *(.data..percpu..shared_aligned)                                \
 716         VMLINUX_SYMBOL(__per_cpu_end) = .;
 717
 718 /**
 719  * PERCPU_VADDR - define output section for percpu area
 720  * @cacheline: cacheline size
 721  * @vaddr: explicit base address (optional)
 722  * @phdr: destination PHDR (optional)
 723  *
 724  * Macro which expands to output section for percpu area.
 725  *
 726  * @cacheline is used to align subsections to avoid false cacheline
 727  * sharing between subsections for different purposes.
 728  *
 729  * If @vaddr is not blank, it specifies explicit base address and all
 730  * percpu symbols will be offset from the given address.  If blank,
 731  * @vaddr always equals @laddr + LOAD_OFFSET.
 732  *
 733  * @phdr defines the output PHDR to use if not blank.  Be warned that
 734  * output PHDR is sticky.  If @phdr is specified, the next output
 735  * section in the linker script will go there too.  @phdr should have
 736  * a leading colon.
 737  *
 738  * Note that this macros defines __per_cpu_load as an absolute symbol.
 739  * If there is no need to put the percpu section at a predetermined
 740  * address, use PERCPU_SECTION.
 741  */
 742 #define PERCPU_VADDR(cacheline, vaddr, phdr)                            \
 743         VMLINUX_SYMBOL(__per_cpu_load) = .;                             \
 744         .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load)         \
 745                                 - LOAD_OFFSET) {                        \
 746                 PERCPU_INPUT(cacheline)                                 \
 747         } phdr                                                          \
 748         . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
 749
 750 /**
 751  * PERCPU_SECTION - define output section for percpu area, simple version
 752  * @cacheline: cacheline size
 753  *
 754  * Align to PAGE_SIZE and outputs output section for percpu area.  This
 755  * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
 756  * __per_cpu_start will be identical.
 757  *
 758  * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
 759  * except that __per_cpu_load is defined as a relative symbol against
 760  * .data..percpu which is required for relocatable x86_32 configuration.
 761  */
 762 #define PERCPU_SECTION(cacheline)                                       \
 763         . = ALIGN(PAGE_SIZE);                                           \
 764         .data..percpu   : AT(ADDR(.data..percpu) - LOAD_OFFSET) {       \
 765                 VMLINUX_SYMBOL(__per_cpu_load) = .;                     \
 766                 PERCPU_INPUT(cacheline)                                 \
 767         }
 768
 769
 770 /*
 771  * Definition of the high level *_SECTION macros
 772  * They will fit only a subset of the architectures
 773  */
 774
 775
 776 /*
 777  * Writeable data.
 778  * All sections are combined in a single .data section.
 779  * The sections following CONSTRUCTORS are arranged so their
 780  * typical alignment matches.
 781  * A cacheline is typical/always less than a PAGE_SIZE so
 782  * the sections that has this restriction (or similar)
 783  * is located before the ones requiring PAGE_SIZE alignment.
 784  * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
 785  * matches the requirement of PAGE_ALIGNED_DATA.
 786  *
 787  * use 0 as page_align if page_aligned data is not used */
 788 #define RW_DATA_SECTION(cacheline, pagealigned, inittask)               \
 789         . = ALIGN(PAGE_SIZE);                                           \
 790         .data : AT(ADDR(.data) - LOAD_OFFSET) {                         \
 791                 INIT_TASK_DATA(inittask)                                \
 792                 NOSAVE_DATA                                             \
 793                 PAGE_ALIGNED_DATA(pagealigned)                          \
 794                 CACHELINE_ALIGNED_DATA(cacheline)                       \
 795                 READ_MOSTLY_DATA(cacheline)                             \
 796                 DATA_DATA                                               \
 797                 CONSTRUCTORS                                            \
 798         }
 799
 800 #define INIT_TEXT_SECTION(inittext_align)                               \
 801         . = ALIGN(inittext_align);                                      \
 802         .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {               \
 803                 VMLINUX_SYMBOL(_sinittext) = .;                         \
 804                 INIT_TEXT                                               \
 805                 VMLINUX_SYMBOL(_einittext) = .;                         \
 806         }
 807
 808 #define INIT_DATA_SECTION(initsetup_align)                              \
 809         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {               \
 810                 INIT_DATA                                               \
 811                 INIT_SETUP(initsetup_align)                             \
 812                 INIT_CALLS                                              \
 813                 CON_INITCALL                                            \
 814                 SECURITY_INITCALL                                       \
 815                 INIT_RAM_FS                                             \
 816         }
 817
 818 #define BSS_SECTION(sbss_align, bss_align, stop_align)                  \
 819         . = ALIGN(sbss_align);                                          \
 820         VMLINUX_SYMBOL(__bss_start) = .;                                \
 821         SBSS(sbss_align)                                                \
 822         BSS(bss_align)                                                  \
 823         . = ALIGN(stop_align);                                          \
 824         VMLINUX_SYMBOL(__bss_stop) = .;