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 #ifdef CONFIG_CLKSRC_OF
 153 #define CLKSRC_OF_TABLES() . = ALIGN(8);                                \
 154                            VMLINUX_SYMBOL(__clksrc_of_table) = .;       \
 155                            *(__clksrc_of_table)                         \
 156                            *(__clksrc_of_table_end)
 157 #else
 158 #define CLKSRC_OF_TABLES()
 159 #endif
 160
 161 #ifdef CONFIG_IRQCHIP
 162 #define IRQCHIP_OF_MATCH_TABLE()                                        \
 163         . = ALIGN(8);                                                   \
 164         VMLINUX_SYMBOL(__irqchip_begin) = .;                            \
 165         *(__irqchip_of_table)                                           \
 166         *(__irqchip_of_end)
 167 #else
 168 #define IRQCHIP_OF_MATCH_TABLE()
 169 #endif
 170
 171 #define KERNEL_DTB()                                                    \
 172         STRUCT_ALIGN();                                                 \
 173         VMLINUX_SYMBOL(__dtb_start) = .;                                \
 174         *(.dtb.init.rodata)                                             \
 175         VMLINUX_SYMBOL(__dtb_end) = .;
 176
 177 /* .data section */
 178 #define DATA_DATA                                                       \
 179         *(.data)                                                        \
 180         *(.ref.data)                                                    \
 181         *(.data..shared_aligned) /* percpu related */                   \
 182         DEV_KEEP(init.data)                                             \
 183         DEV_KEEP(exit.data)                                             \
 184         CPU_KEEP(init.data)                                             \
 185         CPU_KEEP(exit.data)                                             \
 186         MEM_KEEP(init.data)                                             \
 187         MEM_KEEP(exit.data)                                             \
 188         *(.data.unlikely)                                               \
 189         STRUCT_ALIGN();                                                 \
 190         *(__tracepoints)                                                \
 191         /* implement dynamic printk debug */                            \
 192         . = ALIGN(8);                                                   \
 193         VMLINUX_SYMBOL(__start___jump_table) = .;                       \
 194         *(__jump_table)                                                 \
 195         VMLINUX_SYMBOL(__stop___jump_table) = .;                        \
 196         . = ALIGN(8);                                                   \
 197         VMLINUX_SYMBOL(__start___verbose) = .;                          \
 198         *(__verbose)                                                    \
 199         VMLINUX_SYMBOL(__stop___verbose) = .;                           \
 200         LIKELY_PROFILE()                                                \
 201         BRANCH_PROFILE()                                                \
 202         TRACE_PRINTKS()
 203
 204 /*
 205  * Data section helpers
 206  */
 207 #define NOSAVE_DATA                                                     \
 208         . = ALIGN(PAGE_SIZE);                                           \
 209         VMLINUX_SYMBOL(__nosave_begin) = .;                             \
 210         *(.data..nosave)                                                \
 211         . = ALIGN(PAGE_SIZE);                                           \
 212         VMLINUX_SYMBOL(__nosave_end) = .;
 213
 214 #define PAGE_ALIGNED_DATA(page_align)                                   \
 215         . = ALIGN(page_align);                                          \
 216         *(.data..page_aligned)
 217
 218 #define READ_MOSTLY_DATA(align)                                         \
 219         . = ALIGN(align);                                               \
 220         *(.data..read_mostly)                                           \
 221         . = ALIGN(align);
 222
 223 #define CACHELINE_ALIGNED_DATA(align)                                   \
 224         . = ALIGN(align);                                               \
 225         *(.data..cacheline_aligned)
 226
 227 #define INIT_TASK_DATA(align)                                           \
 228         . = ALIGN(align);                                               \
 229         *(.data..init_task)
 230
 231 /*
 232  * Read only Data
 233  */
 234 #define RO_DATA_SECTION(align)                                          \
 235         . = ALIGN((align));                                             \
 236         .rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {           \
 237                 VMLINUX_SYMBOL(__start_rodata) = .;                     \
 238                 *(.rodata) *(.rodata.*)                                 \
 239                 *(__vermagic)           /* Kernel version magic */      \
 240                 . = ALIGN(8);                                           \
 241                 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .;         \
 242                 *(__tracepoints_ptrs)   /* Tracepoints: pointer array */\
 243                 VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .;          \
 244                 *(__tracepoints_strings)/* Tracepoints: strings */      \
 245         }                                                               \
 246                                                                         \
 247         .rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {          \
 248                 *(.rodata1)                                             \
 249         }                                                               \
 250                                                                         \
 251         BUG_TABLE                                                       \
 252                                                                         \
 253         /* PCI quirks */                                                \
 254         .pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {        \
 255                 VMLINUX_SYMBOL(__start_pci_fixups_early) = .;           \
 256                 *(.pci_fixup_early)                                     \
 257                 VMLINUX_SYMBOL(__end_pci_fixups_early) = .;             \
 258                 VMLINUX_SYMBOL(__start_pci_fixups_header) = .;          \
 259                 *(.pci_fixup_header)                                    \
 260                 VMLINUX_SYMBOL(__end_pci_fixups_header) = .;            \
 261                 VMLINUX_SYMBOL(__start_pci_fixups_final) = .;           \
 262                 *(.pci_fixup_final)                                     \
 263                 VMLINUX_SYMBOL(__end_pci_fixups_final) = .;             \
 264                 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .;          \
 265                 *(.pci_fixup_enable)                                    \
 266                 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .;            \
 267                 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .;          \
 268                 *(.pci_fixup_resume)                                    \
 269                 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .;            \
 270                 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .;    \
 271                 *(.pci_fixup_resume_early)                              \
 272                 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .;      \
 273                 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .;         \
 274                 *(.pci_fixup_suspend)                                   \
 275                 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .;           \
 276         }                                                               \
 277                                                                         \
 278         /* Built-in firmware blobs */                                   \
 279         .builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {      \
 280                 VMLINUX_SYMBOL(__start_builtin_fw) = .;                 \
 281                 *(.builtin_fw)                                          \
 282                 VMLINUX_SYMBOL(__end_builtin_fw) = .;                   \
 283         }                                                               \
 284                                                                         \
 285         /* RapidIO route ops */                                         \
 286         .rio_ops        : AT(ADDR(.rio_ops) - LOAD_OFFSET) {            \
 287                 VMLINUX_SYMBOL(__start_rio_switch_ops) = .;             \
 288                 *(.rio_switch_ops)                                      \
 289                 VMLINUX_SYMBOL(__end_rio_switch_ops) = .;               \
 290         }                                                               \
 291                                                                         \
 292         TRACEDATA                                                       \
 293                                                                         \
 294         /* Kernel symbol table: Normal symbols */                       \
 295         __ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {         \
 296                 VMLINUX_SYMBOL(__start___ksymtab) = .;                  \
 297                 *(SORT(___ksymtab+*))                                   \
 298                 VMLINUX_SYMBOL(__stop___ksymtab) = .;                   \
 299         }                                                               \
 300                                                                         \
 301         /* Kernel symbol table: GPL-only symbols */                     \
 302         __ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {     \
 303                 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .;              \
 304                 *(SORT(___ksymtab_gpl+*))                               \
 305                 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .;               \
 306         }                                                               \
 307                                                                         \
 308         /* Kernel symbol table: Normal unused symbols */                \
 309         __ksymtab_unused  : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) {  \
 310                 VMLINUX_SYMBOL(__start___ksymtab_unused) = .;           \
 311                 *(SORT(___ksymtab_unused+*))                            \
 312                 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .;            \
 313         }                                                               \
 314                                                                         \
 315         /* Kernel symbol table: GPL-only unused symbols */              \
 316         __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
 317                 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .;       \
 318                 *(SORT(___ksymtab_unused_gpl+*))                        \
 319                 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .;        \
 320         }                                                               \
 321                                                                         \
 322         /* Kernel symbol table: GPL-future-only symbols */              \
 323         __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
 324                 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .;       \
 325                 *(SORT(___ksymtab_gpl_future+*))                        \
 326                 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .;        \
 327         }                                                               \
 328                                                                         \
 329         /* Kernel symbol table: Normal symbols */                       \
 330         __kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {         \
 331                 VMLINUX_SYMBOL(__start___kcrctab) = .;                  \
 332                 *(SORT(___kcrctab+*))                                   \
 333                 VMLINUX_SYMBOL(__stop___kcrctab) = .;                   \
 334         }                                                               \
 335                                                                         \
 336         /* Kernel symbol table: GPL-only symbols */                     \
 337         __kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {     \
 338                 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .;              \
 339                 *(SORT(___kcrctab_gpl+*))                               \
 340                 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .;               \
 341         }                                                               \
 342                                                                         \
 343         /* Kernel symbol table: Normal unused symbols */                \
 344         __kcrctab_unused  : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) {  \
 345                 VMLINUX_SYMBOL(__start___kcrctab_unused) = .;           \
 346                 *(SORT(___kcrctab_unused+*))                            \
 347                 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .;            \
 348         }                                                               \
 349                                                                         \
 350         /* Kernel symbol table: GPL-only unused symbols */              \
 351         __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
 352                 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .;       \
 353                 *(SORT(___kcrctab_unused_gpl+*))                        \
 354                 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .;        \
 355         }                                                               \
 356                                                                         \
 357         /* Kernel symbol table: GPL-future-only symbols */              \
 358         __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
 359                 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .;       \
 360                 *(SORT(___kcrctab_gpl_future+*))                        \
 361                 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .;        \
 362         }                                                               \
 363                                                                         \
 364         /* Kernel symbol table: strings */                              \
 365         __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
 366                 *(__ksymtab_strings)                                    \
 367         }                                                               \
 368                                                                         \
 369         /* __*init sections */                                          \
 370         __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {         \
 371                 *(.ref.rodata)                                          \
 372                 DEV_KEEP(init.rodata)                                   \
 373                 DEV_KEEP(exit.rodata)                                   \
 374                 CPU_KEEP(init.rodata)                                   \
 375                 CPU_KEEP(exit.rodata)                                   \
 376                 MEM_KEEP(init.rodata)                                   \
 377                 MEM_KEEP(exit.rodata)                                   \
 378         }                                                               \
 379                                                                         \
 380         /* Built-in module parameters. */                               \
 381         __param : AT(ADDR(__param) - LOAD_OFFSET) {                     \
 382                 VMLINUX_SYMBOL(__start___param) = .;                    \
 383                 *(__param)                                              \
 384                 VMLINUX_SYMBOL(__stop___param) = .;                     \
 385         }                                                               \
 386                                                                         \
 387         /* Built-in module versions. */                                 \
 388         __modver : AT(ADDR(__modver) - LOAD_OFFSET) {                   \
 389                 VMLINUX_SYMBOL(__start___modver) = .;                   \
 390                 *(__modver)                                             \
 391                 VMLINUX_SYMBOL(__stop___modver) = .;                    \
 392                 . = ALIGN((align));                                     \
 393                 VMLINUX_SYMBOL(__end_rodata) = .;                       \
 394         }                                                               \
 395         . = ALIGN((align));
 396
 397 /* RODATA & RO_DATA provided for backward compatibility.
 398  * All archs are supposed to use RO_DATA() */
 399 #define RODATA          RO_DATA_SECTION(4096)
 400 #define RO_DATA(align)  RO_DATA_SECTION(align)
 401
 402 #define SECURITY_INIT                                                   \
 403         .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
 404                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 405                 *(.security_initcall.init)                              \
 406                 VMLINUX_SYMBOL(__security_initcall_end) = .;            \
 407         }
 408
 409 /* .text section. Map to function alignment to avoid address changes
 410  * during second ld run in second ld pass when generating System.map */
 411 #define TEXT_TEXT                                                       \
 412                 ALIGN_FUNCTION();                                       \
 413                 *(.text.hot)                                            \
 414                 *(.text)                                                \
 415                 *(.ref.text)                                            \
 416         DEV_KEEP(init.text)                                             \
 417         DEV_KEEP(exit.text)                                             \
 418         CPU_KEEP(init.text)                                             \
 419         CPU_KEEP(exit.text)                                             \
 420         MEM_KEEP(init.text)                                             \
 421         MEM_KEEP(exit.text)                                             \
 422                 *(.text.unlikely)
 423
 424
 425 /* sched.text is aling to function alignment to secure we have same
 426  * address even at second ld pass when generating System.map */
 427 #define SCHED_TEXT                                                      \
 428                 ALIGN_FUNCTION();                                       \
 429                 VMLINUX_SYMBOL(__sched_text_start) = .;                 \
 430                 *(.sched.text)                                          \
 431                 VMLINUX_SYMBOL(__sched_text_end) = .;
 432
 433 /* spinlock.text is aling to function alignment to secure we have same
 434  * address even at second ld pass when generating System.map */
 435 #define LOCK_TEXT                                                       \
 436                 ALIGN_FUNCTION();                                       \
 437                 VMLINUX_SYMBOL(__lock_text_start) = .;                  \
 438                 *(.spinlock.text)                                       \
 439                 VMLINUX_SYMBOL(__lock_text_end) = .;
 440
 441 #define KPROBES_TEXT                                                    \
 442                 ALIGN_FUNCTION();                                       \
 443                 VMLINUX_SYMBOL(__kprobes_text_start) = .;               \
 444                 *(.kprobes.text)                                        \
 445                 VMLINUX_SYMBOL(__kprobes_text_end) = .;
 446
 447 #define ENTRY_TEXT                                                      \
 448                 ALIGN_FUNCTION();                                       \
 449                 VMLINUX_SYMBOL(__entry_text_start) = .;                 \
 450                 *(.entry.text)                                          \
 451                 VMLINUX_SYMBOL(__entry_text_end) = .;
 452
 453 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 454 #define IRQENTRY_TEXT                                                   \
 455                 ALIGN_FUNCTION();                                       \
 456                 VMLINUX_SYMBOL(__irqentry_text_start) = .;              \
 457                 *(.irqentry.text)                                       \
 458                 VMLINUX_SYMBOL(__irqentry_text_end) = .;
 459 #else
 460 #define IRQENTRY_TEXT
 461 #endif
 462
 463 /* Section used for early init (in .S files) */
 464 #define HEAD_TEXT  *(.head.text)
 465
 466 #define HEAD_TEXT_SECTION                                                       \
 467         .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {               \
 468                 HEAD_TEXT                                               \
 469         }
 470
 471 /*
 472  * Exception table
 473  */
 474 #define EXCEPTION_TABLE(align)                                          \
 475         . = ALIGN(align);                                               \
 476         __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {               \
 477                 VMLINUX_SYMBOL(__start___ex_table) = .;                 \
 478                 *(__ex_table)                                           \
 479                 VMLINUX_SYMBOL(__stop___ex_table) = .;                  \
 480         }
 481
 482 /*
 483  * Init task
 484  */
 485 #define INIT_TASK_DATA_SECTION(align)                                   \
 486         . = ALIGN(align);                                               \
 487         .data..init_task :  AT(ADDR(.data..init_task) - LOAD_OFFSET) {  \
 488                 INIT_TASK_DATA(align)                                   \
 489         }
 490
 491 #ifdef CONFIG_CONSTRUCTORS
 492 #define KERNEL_CTORS()  . = ALIGN(8);                      \
 493                         VMLINUX_SYMBOL(__ctors_start) = .; \
 494                         *(.ctors)                          \
 495                         VMLINUX_SYMBOL(__ctors_end) = .;
 496 #else
 497 #define KERNEL_CTORS()
 498 #endif
 499
 500 /* init and exit section handling */
 501 #define INIT_DATA                                                       \
 502         *(.init.data)                                                   \
 503         DEV_DISCARD(init.data)                                          \
 504         CPU_DISCARD(init.data)                                          \
 505         MEM_DISCARD(init.data)                                          \
 506         KERNEL_CTORS()                                                  \
 507         MCOUNT_REC()                                                    \
 508         *(.init.rodata)                                                 \
 509         FTRACE_EVENTS()                                                 \
 510         TRACE_SYSCALLS()                                                \
 511         DEV_DISCARD(init.rodata)                                        \
 512         CPU_DISCARD(init.rodata)                                        \
 513         MEM_DISCARD(init.rodata)                                        \
 514         CLKSRC_OF_TABLES()                                              \
 515         KERNEL_DTB()                                                    \
 516         IRQCHIP_OF_MATCH_TABLE()
 517
 518 #define INIT_TEXT                                                       \
 519         *(.init.text)                                                   \
 520         DEV_DISCARD(init.text)                                          \
 521         CPU_DISCARD(init.text)                                          \
 522         MEM_DISCARD(init.text)
 523
 524 #define EXIT_DATA                                                       \
 525         *(.exit.data)                                                   \
 526         DEV_DISCARD(exit.data)                                          \
 527         DEV_DISCARD(exit.rodata)                                        \
 528         CPU_DISCARD(exit.data)                                          \
 529         CPU_DISCARD(exit.rodata)                                        \
 530         MEM_DISCARD(exit.data)                                          \
 531         MEM_DISCARD(exit.rodata)
 532
 533 #define EXIT_TEXT                                                       \
 534         *(.exit.text)                                                   \
 535         DEV_DISCARD(exit.text)                                          \
 536         CPU_DISCARD(exit.text)                                          \
 537         MEM_DISCARD(exit.text)
 538
 539 #define EXIT_CALL                                                       \
 540         *(.exitcall.exit)
 541
 542 /*
 543  * bss (Block Started by Symbol) - uninitialized data
 544  * zeroed during startup
 545  */
 546 #define SBSS(sbss_align)                                                \
 547         . = ALIGN(sbss_align);                                          \
 548         .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {                         \
 549                 *(.sbss)                                                \
 550                 *(.scommon)                                             \
 551         }
 552
 553 /*
 554  * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
 555  * sections to the front of bss.
 556  */
 557 #ifndef BSS_FIRST_SECTIONS
 558 #define BSS_FIRST_SECTIONS
 559 #endif
 560
 561 #define BSS(bss_align)                                                  \
 562         . = ALIGN(bss_align);                                           \
 563         .bss : AT(ADDR(.bss) - LOAD_OFFSET) {                           \
 564                 BSS_FIRST_SECTIONS                                      \
 565                 *(.bss..page_aligned)                                   \
 566                 *(.dynbss)                                              \
 567                 *(.bss)                                                 \
 568                 *(COMMON)                                               \
 569         }
 570
 571 /*
 572  * DWARF debug sections.
 573  * Symbols in the DWARF debugging sections are relative to
 574  * the beginning of the section so we begin them at 0.
 575  */
 576 #define DWARF_DEBUG                                                     \
 577                 /* DWARF 1 */                                           \
 578                 .debug          0 : { *(.debug) }                       \
 579                 .line           0 : { *(.line) }                        \
 580                 /* GNU DWARF 1 extensions */                            \
 581                 .debug_srcinfo  0 : { *(.debug_srcinfo) }               \
 582                 .debug_sfnames  0 : { *(.debug_sfnames) }               \
 583                 /* DWARF 1.1 and DWARF 2 */                             \
 584                 .debug_aranges  0 : { *(.debug_aranges) }               \
 585                 .debug_pubnames 0 : { *(.debug_pubnames) }              \
 586                 /* DWARF 2 */                                           \
 587                 .debug_info     0 : { *(.debug_info                     \
 588                                 .gnu.linkonce.wi.*) }                   \
 589                 .debug_abbrev   0 : { *(.debug_abbrev) }                \
 590                 .debug_line     0 : { *(.debug_line) }                  \
 591                 .debug_frame    0 : { *(.debug_frame) }                 \
 592                 .debug_str      0 : { *(.debug_str) }                   \
 593                 .debug_loc      0 : { *(.debug_loc) }                   \
 594                 .debug_macinfo  0 : { *(.debug_macinfo) }               \
 595                 /* SGI/MIPS DWARF 2 extensions */                       \
 596                 .debug_weaknames 0 : { *(.debug_weaknames) }            \
 597                 .debug_funcnames 0 : { *(.debug_funcnames) }            \
 598                 .debug_typenames 0 : { *(.debug_typenames) }            \
 599                 .debug_varnames  0 : { *(.debug_varnames) }             \
 600
 601                 /* Stabs debugging sections.  */
 602 #define STABS_DEBUG                                                     \
 603                 .stab 0 : { *(.stab) }                                  \
 604                 .stabstr 0 : { *(.stabstr) }                            \
 605                 .stab.excl 0 : { *(.stab.excl) }                        \
 606                 .stab.exclstr 0 : { *(.stab.exclstr) }                  \
 607                 .stab.index 0 : { *(.stab.index) }                      \
 608                 .stab.indexstr 0 : { *(.stab.indexstr) }                \
 609                 .comment 0 : { *(.comment) }
 610
 611 #ifdef CONFIG_GENERIC_BUG
 612 #define BUG_TABLE                                                       \
 613         . = ALIGN(8);                                                   \
 614         __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {             \
 615                 VMLINUX_SYMBOL(__start___bug_table) = .;                \
 616                 *(__bug_table)                                          \
 617                 VMLINUX_SYMBOL(__stop___bug_table) = .;                 \
 618         }
 619 #else
 620 #define BUG_TABLE
 621 #endif
 622
 623 #ifdef CONFIG_PM_TRACE
 624 #define TRACEDATA                                                       \
 625         . = ALIGN(4);                                                   \
 626         .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {               \
 627                 VMLINUX_SYMBOL(__tracedata_start) = .;                  \
 628                 *(.tracedata)                                           \
 629                 VMLINUX_SYMBOL(__tracedata_end) = .;                    \
 630         }
 631 #else
 632 #define TRACEDATA
 633 #endif
 634
 635 #define NOTES                                                           \
 636         .notes : AT(ADDR(.notes) - LOAD_OFFSET) {                       \
 637                 VMLINUX_SYMBOL(__start_notes) = .;                      \
 638                 *(.note.*)                                              \
 639                 VMLINUX_SYMBOL(__stop_notes) = .;                       \
 640         }
 641
 642 #define INIT_SETUP(initsetup_align)                                     \
 643                 . = ALIGN(initsetup_align);                             \
 644                 VMLINUX_SYMBOL(__setup_start) = .;                      \
 645                 *(.init.setup)                                          \
 646                 VMLINUX_SYMBOL(__setup_end) = .;
 647
 648 #define INIT_CALLS_LEVEL(level)                                         \
 649                 VMLINUX_SYMBOL(__initcall##level##_start) = .;          \
 650                 *(.initcall##level##.init)                              \
 651                 *(.initcall##level##s.init)                             \
 652
 653 #define INIT_CALLS                                                      \
 654                 VMLINUX_SYMBOL(__initcall_start) = .;                   \
 655                 *(.initcallearly.init)                                  \
 656                 INIT_CALLS_LEVEL(0)                                     \
 657                 INIT_CALLS_LEVEL(1)                                     \
 658                 INIT_CALLS_LEVEL(2)                                     \
 659                 INIT_CALLS_LEVEL(3)                                     \
 660                 INIT_CALLS_LEVEL(4)                                     \
 661                 INIT_CALLS_LEVEL(5)                                     \
 662                 INIT_CALLS_LEVEL(rootfs)                                \
 663                 INIT_CALLS_LEVEL(6)                                     \
 664                 INIT_CALLS_LEVEL(7)                                     \
 665                 VMLINUX_SYMBOL(__initcall_end) = .;
 666
 667 #define CON_INITCALL                                                    \
 668                 VMLINUX_SYMBOL(__con_initcall_start) = .;               \
 669                 *(.con_initcall.init)                                   \
 670                 VMLINUX_SYMBOL(__con_initcall_end) = .;
 671
 672 #define SECURITY_INITCALL                                               \
 673                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 674                 *(.security_initcall.init)                              \
 675                 VMLINUX_SYMBOL(__security_initcall_end) = .;
 676
 677 #ifdef CONFIG_BLK_DEV_INITRD
 678 #define INIT_RAM_FS                                                     \
 679         . = ALIGN(4);                                                   \
 680         VMLINUX_SYMBOL(__initramfs_start) = .;                          \
 681         *(.init.ramfs)                                                  \
 682         . = ALIGN(8);                                                   \
 683         *(.init.ramfs.info)
 684 #else
 685 #define INIT_RAM_FS
 686 #endif
 687
 688 /*
 689  * Default discarded sections.
 690  *
 691  * Some archs want to discard exit text/data at runtime rather than
 692  * link time due to cross-section references such as alt instructions,
 693  * bug table, eh_frame, etc.  DISCARDS must be the last of output
 694  * section definitions so that such archs put those in earlier section
 695  * definitions.
 696  */
 697 #define DISCARDS                                                        \
 698         /DISCARD/ : {                                                   \
 699         EXIT_TEXT                                                       \
 700         EXIT_DATA                                                       \
 701         EXIT_CALL                                                       \
 702         *(.discard)                                                     \
 703         *(.discard.*)                                                   \
 704         }
 705
 706 /**
 707  * PERCPU_INPUT - the percpu input sections
 708  * @cacheline: cacheline size
 709  *
 710  * The core percpu section names and core symbols which do not rely
 711  * directly upon load addresses.
 712  *
 713  * @cacheline is used to align subsections to avoid false cacheline
 714  * sharing between subsections for different purposes.
 715  */
 716 #define PERCPU_INPUT(cacheline)                                         \
 717         VMLINUX_SYMBOL(__per_cpu_start) = .;                            \
 718         *(.data..percpu..first)                                         \
 719         . = ALIGN(PAGE_SIZE);                                           \
 720         *(.data..percpu..page_aligned)                                  \
 721         . = ALIGN(cacheline);                                           \
 722         *(.data..percpu..readmostly)                                    \
 723         . = ALIGN(cacheline);                                           \
 724         *(.data..percpu)                                                \
 725         *(.data..percpu..shared_aligned)                                \
 726         VMLINUX_SYMBOL(__per_cpu_end) = .;
 727
 728 /**
 729  * PERCPU_VADDR - define output section for percpu area
 730  * @cacheline: cacheline size
 731  * @vaddr: explicit base address (optional)
 732  * @phdr: destination PHDR (optional)
 733  *
 734  * Macro which expands to output section for percpu area.
 735  *
 736  * @cacheline is used to align subsections to avoid false cacheline
 737  * sharing between subsections for different purposes.
 738  *
 739  * If @vaddr is not blank, it specifies explicit base address and all
 740  * percpu symbols will be offset from the given address.  If blank,
 741  * @vaddr always equals @laddr + LOAD_OFFSET.
 742  *
 743  * @phdr defines the output PHDR to use if not blank.  Be warned that
 744  * output PHDR is sticky.  If @phdr is specified, the next output
 745  * section in the linker script will go there too.  @phdr should have
 746  * a leading colon.
 747  *
 748  * Note that this macros defines __per_cpu_load as an absolute symbol.
 749  * If there is no need to put the percpu section at a predetermined
 750  * address, use PERCPU_SECTION.
 751  */
 752 #define PERCPU_VADDR(cacheline, vaddr, phdr)                            \
 753         VMLINUX_SYMBOL(__per_cpu_load) = .;                             \
 754         .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load)         \
 755                                 - LOAD_OFFSET) {                        \
 756                 PERCPU_INPUT(cacheline)                                 \
 757         } phdr                                                          \
 758         . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
 759
 760 /**
 761  * PERCPU_SECTION - define output section for percpu area, simple version
 762  * @cacheline: cacheline size
 763  *
 764  * Align to PAGE_SIZE and outputs output section for percpu area.  This
 765  * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
 766  * __per_cpu_start will be identical.
 767  *
 768  * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
 769  * except that __per_cpu_load is defined as a relative symbol against
 770  * .data..percpu which is required for relocatable x86_32 configuration.
 771  */
 772 #define PERCPU_SECTION(cacheline)                                       \
 773         . = ALIGN(PAGE_SIZE);                                           \
 774         .data..percpu   : AT(ADDR(.data..percpu) - LOAD_OFFSET) {       \
 775                 VMLINUX_SYMBOL(__per_cpu_load) = .;                     \
 776                 PERCPU_INPUT(cacheline)                                 \
 777         }
 778
 779
 780 /*
 781  * Definition of the high level *_SECTION macros
 782  * They will fit only a subset of the architectures
 783  */
 784
 785
 786 /*
 787  * Writeable data.
 788  * All sections are combined in a single .data section.
 789  * The sections following CONSTRUCTORS are arranged so their
 790  * typical alignment matches.
 791  * A cacheline is typical/always less than a PAGE_SIZE so
 792  * the sections that has this restriction (or similar)
 793  * is located before the ones requiring PAGE_SIZE alignment.
 794  * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
 795  * matches the requirement of PAGE_ALIGNED_DATA.
 796  *
 797  * use 0 as page_align if page_aligned data is not used */
 798 #define RW_DATA_SECTION(cacheline, pagealigned, inittask)               \
 799         . = ALIGN(PAGE_SIZE);                                           \
 800         .data : AT(ADDR(.data) - LOAD_OFFSET) {                         \
 801                 INIT_TASK_DATA(inittask)                                \
 802                 NOSAVE_DATA                                             \
 803                 PAGE_ALIGNED_DATA(pagealigned)                          \
 804                 CACHELINE_ALIGNED_DATA(cacheline)                       \
 805                 READ_MOSTLY_DATA(cacheline)                             \
 806                 DATA_DATA                                               \
 807                 CONSTRUCTORS                                            \
 808         }
 809
 810 #define INIT_TEXT_SECTION(inittext_align)                               \
 811         . = ALIGN(inittext_align);                                      \
 812         .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {               \
 813                 VMLINUX_SYMBOL(_sinittext) = .;                         \
 814                 INIT_TEXT                                               \
 815                 VMLINUX_SYMBOL(_einittext) = .;                         \
 816         }
 817
 818 #define INIT_DATA_SECTION(initsetup_align)                              \
 819         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {               \
 820                 INIT_DATA                                               \
 821                 INIT_SETUP(initsetup_align)                             \
 822                 INIT_CALLS                                              \
 823                 CON_INITCALL                                            \
 824                 SECURITY_INITCALL                                       \
 825                 INIT_RAM_FS                                             \
 826         }
 827
 828 #define BSS_SECTION(sbss_align, bss_align, stop_align)                  \
 829         . = ALIGN(sbss_align);                                          \
 830         VMLINUX_SYMBOL(__bss_start) = .;                                \
 831         SBSS(sbss_align)                                                \
 832         BSS(bss_align)                                                  \
 833         . = ALIGN(stop_align);                                          \
 834         VMLINUX_SYMBOL(__bss_stop) = .;