linux/include/asm-generic/vmlinux.lds.h
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   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#ifdef CONFIG_COMMON_CLK
 172#define CLK_OF_TABLES() . = ALIGN(8);                           \
 173                        VMLINUX_SYMBOL(__clk_of_table) = .;     \
 174                        *(__clk_of_table)                       \
 175                        *(__clk_of_table_end)
 176#else
 177#define CLK_OF_TABLES()
 178#endif
 179
 180#define KERNEL_DTB()                                                    \
 181        STRUCT_ALIGN();                                                 \
 182        VMLINUX_SYMBOL(__dtb_start) = .;                                \
 183        *(.dtb.init.rodata)                                             \
 184        VMLINUX_SYMBOL(__dtb_end) = .;
 185
 186/* .data section */
 187#define DATA_DATA                                                       \
 188        *(.data)                                                        \
 189        *(.ref.data)                                                    \
 190        *(.data..shared_aligned) /* percpu related */                   \
 191        DEV_KEEP(init.data)                                             \
 192        DEV_KEEP(exit.data)                                             \
 193        CPU_KEEP(init.data)                                             \
 194        CPU_KEEP(exit.data)                                             \
 195        MEM_KEEP(init.data)                                             \
 196        MEM_KEEP(exit.data)                                             \
 197        *(.data.unlikely)                                               \
 198        STRUCT_ALIGN();                                                 \
 199        *(__tracepoints)                                                \
 200        /* implement dynamic printk debug */                            \
 201        . = ALIGN(8);                                                   \
 202        VMLINUX_SYMBOL(__start___jump_table) = .;                       \
 203        *(__jump_table)                                                 \
 204        VMLINUX_SYMBOL(__stop___jump_table) = .;                        \
 205        . = ALIGN(8);                                                   \
 206        VMLINUX_SYMBOL(__start___verbose) = .;                          \
 207        *(__verbose)                                                    \
 208        VMLINUX_SYMBOL(__stop___verbose) = .;                           \
 209        LIKELY_PROFILE()                                                \
 210        BRANCH_PROFILE()                                                \
 211        TRACE_PRINTKS()
 212
 213/*
 214 * Data section helpers
 215 */
 216#define NOSAVE_DATA                                                     \
 217        . = ALIGN(PAGE_SIZE);                                           \
 218        VMLINUX_SYMBOL(__nosave_begin) = .;                             \
 219        *(.data..nosave)                                                \
 220        . = ALIGN(PAGE_SIZE);                                           \
 221        VMLINUX_SYMBOL(__nosave_end) = .;
 222
 223#define PAGE_ALIGNED_DATA(page_align)                                   \
 224        . = ALIGN(page_align);                                          \
 225        *(.data..page_aligned)
 226
 227#define READ_MOSTLY_DATA(align)                                         \
 228        . = ALIGN(align);                                               \
 229        *(.data..read_mostly)                                           \
 230        . = ALIGN(align);
 231
 232#define CACHELINE_ALIGNED_DATA(align)                                   \
 233        . = ALIGN(align);                                               \
 234        *(.data..cacheline_aligned)
 235
 236#define INIT_TASK_DATA(align)                                           \
 237        . = ALIGN(align);                                               \
 238        *(.data..init_task)
 239
 240/*
 241 * Read only Data
 242 */
 243#define RO_DATA_SECTION(align)                                          \
 244        . = ALIGN((align));                                             \
 245        .rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {           \
 246                VMLINUX_SYMBOL(__start_rodata) = .;                     \
 247                *(.rodata) *(.rodata.*)                                 \
 248                *(__vermagic)           /* Kernel version magic */      \
 249                . = ALIGN(8);                                           \
 250                VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .;         \
 251                *(__tracepoints_ptrs)   /* Tracepoints: pointer array */\
 252                VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .;          \
 253                *(__tracepoints_strings)/* Tracepoints: strings */      \
 254        }                                                               \
 255                                                                        \
 256        .rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {          \
 257                *(.rodata1)                                             \
 258        }                                                               \
 259                                                                        \
 260        BUG_TABLE                                                       \
 261                                                                        \
 262        /* PCI quirks */                                                \
 263        .pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {        \
 264                VMLINUX_SYMBOL(__start_pci_fixups_early) = .;           \
 265                *(.pci_fixup_early)                                     \
 266                VMLINUX_SYMBOL(__end_pci_fixups_early) = .;             \
 267                VMLINUX_SYMBOL(__start_pci_fixups_header) = .;          \
 268                *(.pci_fixup_header)                                    \
 269                VMLINUX_SYMBOL(__end_pci_fixups_header) = .;            \
 270                VMLINUX_SYMBOL(__start_pci_fixups_final) = .;           \
 271                *(.pci_fixup_final)                                     \
 272                VMLINUX_SYMBOL(__end_pci_fixups_final) = .;             \
 273                VMLINUX_SYMBOL(__start_pci_fixups_enable) = .;          \
 274                *(.pci_fixup_enable)                                    \
 275                VMLINUX_SYMBOL(__end_pci_fixups_enable) = .;            \
 276                VMLINUX_SYMBOL(__start_pci_fixups_resume) = .;          \
 277                *(.pci_fixup_resume)                                    \
 278                VMLINUX_SYMBOL(__end_pci_fixups_resume) = .;            \
 279                VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .;    \
 280                *(.pci_fixup_resume_early)                              \
 281                VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .;      \
 282                VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .;         \
 283                *(.pci_fixup_suspend)                                   \
 284                VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .;           \
 285        }                                                               \
 286                                                                        \
 287        /* Built-in firmware blobs */                                   \
 288        .builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {      \
 289                VMLINUX_SYMBOL(__start_builtin_fw) = .;                 \
 290                *(.builtin_fw)                                          \
 291                VMLINUX_SYMBOL(__end_builtin_fw) = .;                   \
 292        }                                                               \
 293                                                                        \
 294        /* RapidIO route ops */                                         \
 295        .rio_ops        : AT(ADDR(.rio_ops) - LOAD_OFFSET) {            \
 296                VMLINUX_SYMBOL(__start_rio_switch_ops) = .;             \
 297                *(.rio_switch_ops)                                      \
 298                VMLINUX_SYMBOL(__end_rio_switch_ops) = .;               \
 299        }                                                               \
 300                                                                        \
 301        TRACEDATA                                                       \
 302                                                                        \
 303        /* Kernel symbol table: Normal symbols */                       \
 304        __ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {         \
 305                VMLINUX_SYMBOL(__start___ksymtab) = .;                  \
 306                *(SORT(___ksymtab+*))                                   \
 307                VMLINUX_SYMBOL(__stop___ksymtab) = .;                   \
 308        }                                                               \
 309                                                                        \
 310        /* Kernel symbol table: GPL-only symbols */                     \
 311        __ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {     \
 312                VMLINUX_SYMBOL(__start___ksymtab_gpl) = .;              \
 313                *(SORT(___ksymtab_gpl+*))                               \
 314                VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .;               \
 315        }                                                               \
 316                                                                        \
 317        /* Kernel symbol table: Normal unused symbols */                \
 318        __ksymtab_unused  : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) {  \
 319                VMLINUX_SYMBOL(__start___ksymtab_unused) = .;           \
 320                *(SORT(___ksymtab_unused+*))                            \
 321                VMLINUX_SYMBOL(__stop___ksymtab_unused) = .;            \
 322        }                                                               \
 323                                                                        \
 324        /* Kernel symbol table: GPL-only unused symbols */              \
 325        __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
 326                VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .;       \
 327                *(SORT(___ksymtab_unused_gpl+*))                        \
 328                VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .;        \
 329        }                                                               \
 330                                                                        \
 331        /* Kernel symbol table: GPL-future-only symbols */              \
 332        __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
 333                VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .;       \
 334                *(SORT(___ksymtab_gpl_future+*))                        \
 335                VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .;        \
 336        }                                                               \
 337                                                                        \
 338        /* Kernel symbol table: Normal symbols */                       \
 339        __kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {         \
 340                VMLINUX_SYMBOL(__start___kcrctab) = .;                  \
 341                *(SORT(___kcrctab+*))                                   \
 342                VMLINUX_SYMBOL(__stop___kcrctab) = .;                   \
 343        }                                                               \
 344                                                                        \
 345        /* Kernel symbol table: GPL-only symbols */                     \
 346        __kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {     \
 347                VMLINUX_SYMBOL(__start___kcrctab_gpl) = .;              \
 348                *(SORT(___kcrctab_gpl+*))                               \
 349                VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .;               \
 350        }                                                               \
 351                                                                        \
 352        /* Kernel symbol table: Normal unused symbols */                \
 353        __kcrctab_unused  : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) {  \
 354                VMLINUX_SYMBOL(__start___kcrctab_unused) = .;           \
 355                *(SORT(___kcrctab_unused+*))                            \
 356                VMLINUX_SYMBOL(__stop___kcrctab_unused) = .;            \
 357        }                                                               \
 358                                                                        \
 359        /* Kernel symbol table: GPL-only unused symbols */              \
 360        __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
 361                VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .;       \
 362                *(SORT(___kcrctab_unused_gpl+*))                        \
 363                VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .;        \
 364        }                                                               \
 365                                                                        \
 366        /* Kernel symbol table: GPL-future-only symbols */              \
 367        __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
 368                VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .;       \
 369                *(SORT(___kcrctab_gpl_future+*))                        \
 370                VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .;        \
 371        }                                                               \
 372                                                                        \
 373        /* Kernel symbol table: strings */                              \
 374        __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
 375                *(__ksymtab_strings)                                    \
 376        }                                                               \
 377                                                                        \
 378        /* __*init sections */                                          \
 379        __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {         \
 380                *(.ref.rodata)                                          \
 381                DEV_KEEP(init.rodata)                                   \
 382                DEV_KEEP(exit.rodata)                                   \
 383                CPU_KEEP(init.rodata)                                   \
 384                CPU_KEEP(exit.rodata)                                   \
 385                MEM_KEEP(init.rodata)                                   \
 386                MEM_KEEP(exit.rodata)                                   \
 387        }                                                               \
 388                                                                        \
 389        /* Built-in module parameters. */                               \
 390        __param : AT(ADDR(__param) - LOAD_OFFSET) {                     \
 391                VMLINUX_SYMBOL(__start___param) = .;                    \
 392                *(__param)                                              \
 393                VMLINUX_SYMBOL(__stop___param) = .;                     \
 394        }                                                               \
 395                                                                        \
 396        /* Built-in module versions. */                                 \
 397        __modver : AT(ADDR(__modver) - LOAD_OFFSET) {                   \
 398                VMLINUX_SYMBOL(__start___modver) = .;                   \
 399                *(__modver)                                             \
 400                VMLINUX_SYMBOL(__stop___modver) = .;                    \
 401                . = ALIGN((align));                                     \
 402                VMLINUX_SYMBOL(__end_rodata) = .;                       \
 403        }                                                               \
 404        . = ALIGN((align));
 405
 406/* RODATA & RO_DATA provided for backward compatibility.
 407 * All archs are supposed to use RO_DATA() */
 408#define RODATA          RO_DATA_SECTION(4096)
 409#define RO_DATA(align)  RO_DATA_SECTION(align)
 410
 411#define SECURITY_INIT                                                   \
 412        .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
 413                VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 414                *(.security_initcall.init)                              \
 415                VMLINUX_SYMBOL(__security_initcall_end) = .;            \
 416        }
 417
 418/* .text section. Map to function alignment to avoid address changes
 419 * during second ld run in second ld pass when generating System.map */
 420#define TEXT_TEXT                                                       \
 421                ALIGN_FUNCTION();                                       \
 422                *(.text.hot)                                            \
 423                *(.text)                                                \
 424                *(.ref.text)                                            \
 425        DEV_KEEP(init.text)                                             \
 426        DEV_KEEP(exit.text)                                             \
 427        CPU_KEEP(init.text)                                             \
 428        CPU_KEEP(exit.text)                                             \
 429        MEM_KEEP(init.text)                                             \
 430        MEM_KEEP(exit.text)                                             \
 431                *(.text.unlikely)
 432
 433
 434/* sched.text is aling to function alignment to secure we have same
 435 * address even at second ld pass when generating System.map */
 436#define SCHED_TEXT                                                      \
 437                ALIGN_FUNCTION();                                       \
 438                VMLINUX_SYMBOL(__sched_text_start) = .;                 \
 439                *(.sched.text)                                          \
 440                VMLINUX_SYMBOL(__sched_text_end) = .;
 441
 442/* spinlock.text is aling to function alignment to secure we have same
 443 * address even at second ld pass when generating System.map */
 444#define LOCK_TEXT                                                       \
 445                ALIGN_FUNCTION();                                       \
 446                VMLINUX_SYMBOL(__lock_text_start) = .;                  \
 447                *(.spinlock.text)                                       \
 448                VMLINUX_SYMBOL(__lock_text_end) = .;
 449
 450#define KPROBES_TEXT                                                    \
 451                ALIGN_FUNCTION();                                       \
 452                VMLINUX_SYMBOL(__kprobes_text_start) = .;               \
 453                *(.kprobes.text)                                        \
 454                VMLINUX_SYMBOL(__kprobes_text_end) = .;
 455
 456#define ENTRY_TEXT                                                      \
 457                ALIGN_FUNCTION();                                       \
 458                VMLINUX_SYMBOL(__entry_text_start) = .;                 \
 459                *(.entry.text)                                          \
 460                VMLINUX_SYMBOL(__entry_text_end) = .;
 461
 462#ifdef CONFIG_FUNCTION_GRAPH_TRACER
 463#define IRQENTRY_TEXT                                                   \
 464                ALIGN_FUNCTION();                                       \
 465                VMLINUX_SYMBOL(__irqentry_text_start) = .;              \
 466                *(.irqentry.text)                                       \
 467                VMLINUX_SYMBOL(__irqentry_text_end) = .;
 468#else
 469#define IRQENTRY_TEXT
 470#endif
 471
 472/* Section used for early init (in .S files) */
 473#define HEAD_TEXT  *(.head.text)
 474
 475#define HEAD_TEXT_SECTION                                                       \
 476        .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {               \
 477                HEAD_TEXT                                               \
 478        }
 479
 480/*
 481 * Exception table
 482 */
 483#define EXCEPTION_TABLE(align)                                          \
 484        . = ALIGN(align);                                               \
 485        __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {               \
 486                VMLINUX_SYMBOL(__start___ex_table) = .;                 \
 487                *(__ex_table)                                           \
 488                VMLINUX_SYMBOL(__stop___ex_table) = .;                  \
 489        }
 490
 491/*
 492 * Init task
 493 */
 494#define INIT_TASK_DATA_SECTION(align)                                   \
 495        . = ALIGN(align);                                               \
 496        .data..init_task :  AT(ADDR(.data..init_task) - LOAD_OFFSET) {  \
 497                INIT_TASK_DATA(align)                                   \
 498        }
 499
 500#ifdef CONFIG_CONSTRUCTORS
 501#define KERNEL_CTORS()  . = ALIGN(8);                      \
 502                        VMLINUX_SYMBOL(__ctors_start) = .; \
 503                        *(.ctors)                          \
 504                        VMLINUX_SYMBOL(__ctors_end) = .;
 505#else
 506#define KERNEL_CTORS()
 507#endif
 508
 509/* init and exit section handling */
 510#define INIT_DATA                                                       \
 511        *(.init.data)                                                   \
 512        DEV_DISCARD(init.data)                                          \
 513        CPU_DISCARD(init.data)                                          \
 514        MEM_DISCARD(init.data)                                          \
 515        KERNEL_CTORS()                                                  \
 516        MCOUNT_REC()                                                    \
 517        *(.init.rodata)                                                 \
 518        FTRACE_EVENTS()                                                 \
 519        TRACE_SYSCALLS()                                                \
 520        DEV_DISCARD(init.rodata)                                        \
 521        CPU_DISCARD(init.rodata)                                        \
 522        MEM_DISCARD(init.rodata)                                        \
 523        CLK_OF_TABLES()                                                 \
 524        CLKSRC_OF_TABLES()                                              \
 525        KERNEL_DTB()                                                    \
 526        IRQCHIP_OF_MATCH_TABLE()
 527
 528#define INIT_TEXT                                                       \
 529        *(.init.text)                                                   \
 530        DEV_DISCARD(init.text)                                          \
 531        CPU_DISCARD(init.text)                                          \
 532        MEM_DISCARD(init.text)
 533
 534#define EXIT_DATA                                                       \
 535        *(.exit.data)                                                   \
 536        DEV_DISCARD(exit.data)                                          \
 537        DEV_DISCARD(exit.rodata)                                        \
 538        CPU_DISCARD(exit.data)                                          \
 539        CPU_DISCARD(exit.rodata)                                        \
 540        MEM_DISCARD(exit.data)                                          \
 541        MEM_DISCARD(exit.rodata)
 542
 543#define EXIT_TEXT                                                       \
 544        *(.exit.text)                                                   \
 545        DEV_DISCARD(exit.text)                                          \
 546        CPU_DISCARD(exit.text)                                          \
 547        MEM_DISCARD(exit.text)
 548
 549#define EXIT_CALL                                                       \
 550        *(.exitcall.exit)
 551
 552/*
 553 * bss (Block Started by Symbol) - uninitialized data
 554 * zeroed during startup
 555 */
 556#define SBSS(sbss_align)                                                \
 557        . = ALIGN(sbss_align);                                          \
 558        .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {                         \
 559                *(.sbss)                                                \
 560                *(.scommon)                                             \
 561        }
 562
 563/*
 564 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
 565 * sections to the front of bss.
 566 */
 567#ifndef BSS_FIRST_SECTIONS
 568#define BSS_FIRST_SECTIONS
 569#endif
 570
 571#define BSS(bss_align)                                                  \
 572        . = ALIGN(bss_align);                                           \
 573        .bss : AT(ADDR(.bss) - LOAD_OFFSET) {                           \
 574                BSS_FIRST_SECTIONS                                      \
 575                *(.bss..page_aligned)                                   \
 576                *(.dynbss)                                              \
 577                *(.bss)                                                 \
 578                *(COMMON)                                               \
 579        }
 580
 581/*
 582 * DWARF debug sections.
 583 * Symbols in the DWARF debugging sections are relative to
 584 * the beginning of the section so we begin them at 0.
 585 */
 586#define DWARF_DEBUG                                                     \
 587                /* DWARF 1 */                                           \
 588                .debug          0 : { *(.debug) }                       \
 589                .line           0 : { *(.line) }                        \
 590                /* GNU DWARF 1 extensions */                            \
 591                .debug_srcinfo  0 : { *(.debug_srcinfo) }               \
 592                .debug_sfnames  0 : { *(.debug_sfnames) }               \
 593                /* DWARF 1.1 and DWARF 2 */                             \
 594                .debug_aranges  0 : { *(.debug_aranges) }               \
 595                .debug_pubnames 0 : { *(.debug_pubnames) }              \
 596                /* DWARF 2 */                                           \
 597                .debug_info     0 : { *(.debug_info                     \
 598                                .gnu.linkonce.wi.*) }                   \
 599                .debug_abbrev   0 : { *(.debug_abbrev) }                \
 600                .debug_line     0 : { *(.debug_line) }                  \
 601                .debug_frame    0 : { *(.debug_frame) }                 \
 602                .debug_str      0 : { *(.debug_str) }                   \
 603                .debug_loc      0 : { *(.debug_loc) }                   \
 604                .debug_macinfo  0 : { *(.debug_macinfo) }               \
 605                /* SGI/MIPS DWARF 2 extensions */                       \
 606                .debug_weaknames 0 : { *(.debug_weaknames) }            \
 607                .debug_funcnames 0 : { *(.debug_funcnames) }            \
 608                .debug_typenames 0 : { *(.debug_typenames) }            \
 609                .debug_varnames  0 : { *(.debug_varnames) }             \
 610
 611                /* Stabs debugging sections.  */
 612#define STABS_DEBUG                                                     \
 613                .stab 0 : { *(.stab) }                                  \
 614                .stabstr 0 : { *(.stabstr) }                            \
 615                .stab.excl 0 : { *(.stab.excl) }                        \
 616                .stab.exclstr 0 : { *(.stab.exclstr) }                  \
 617                .stab.index 0 : { *(.stab.index) }                      \
 618                .stab.indexstr 0 : { *(.stab.indexstr) }                \
 619                .comment 0 : { *(.comment) }
 620
 621#ifdef CONFIG_GENERIC_BUG
 622#define BUG_TABLE                                                       \
 623        . = ALIGN(8);                                                   \
 624        __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {             \
 625                VMLINUX_SYMBOL(__start___bug_table) = .;                \
 626                *(__bug_table)                                          \
 627                VMLINUX_SYMBOL(__stop___bug_table) = .;                 \
 628        }
 629#else
 630#define BUG_TABLE
 631#endif
 632
 633#ifdef CONFIG_PM_TRACE
 634#define TRACEDATA                                                       \
 635        . = ALIGN(4);                                                   \
 636        .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {               \
 637                VMLINUX_SYMBOL(__tracedata_start) = .;                  \
 638                *(.tracedata)                                           \
 639                VMLINUX_SYMBOL(__tracedata_end) = .;                    \
 640        }
 641#else
 642#define TRACEDATA
 643#endif
 644
 645#define NOTES                                                           \
 646        .notes : AT(ADDR(.notes) - LOAD_OFFSET) {                       \
 647                VMLINUX_SYMBOL(__start_notes) = .;                      \
 648                *(.note.*)                                              \
 649                VMLINUX_SYMBOL(__stop_notes) = .;                       \
 650        }
 651
 652#define INIT_SETUP(initsetup_align)                                     \
 653                . = ALIGN(initsetup_align);                             \
 654                VMLINUX_SYMBOL(__setup_start) = .;                      \
 655                *(.init.setup)                                          \
 656                VMLINUX_SYMBOL(__setup_end) = .;
 657
 658#define INIT_CALLS_LEVEL(level)                                         \
 659                VMLINUX_SYMBOL(__initcall##level##_start) = .;          \
 660                *(.initcall##level##.init)                              \
 661                *(.initcall##level##s.init)                             \
 662
 663#define INIT_CALLS                                                      \
 664                VMLINUX_SYMBOL(__initcall_start) = .;                   \
 665                *(.initcallearly.init)                                  \
 666                INIT_CALLS_LEVEL(0)                                     \
 667                INIT_CALLS_LEVEL(1)                                     \
 668                INIT_CALLS_LEVEL(2)                                     \
 669                INIT_CALLS_LEVEL(3)                                     \
 670                INIT_CALLS_LEVEL(4)                                     \
 671                INIT_CALLS_LEVEL(5)                                     \
 672                INIT_CALLS_LEVEL(rootfs)                                \
 673                INIT_CALLS_LEVEL(6)                                     \
 674                INIT_CALLS_LEVEL(7)                                     \
 675                VMLINUX_SYMBOL(__initcall_end) = .;
 676
 677#define CON_INITCALL                                                    \
 678                VMLINUX_SYMBOL(__con_initcall_start) = .;               \
 679                *(.con_initcall.init)                                   \
 680                VMLINUX_SYMBOL(__con_initcall_end) = .;
 681
 682#define SECURITY_INITCALL                                               \
 683                VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 684                *(.security_initcall.init)                              \
 685                VMLINUX_SYMBOL(__security_initcall_end) = .;
 686
 687#ifdef CONFIG_BLK_DEV_INITRD
 688#define INIT_RAM_FS                                                     \
 689        . = ALIGN(4);                                                   \
 690        VMLINUX_SYMBOL(__initramfs_start) = .;                          \
 691        *(.init.ramfs)                                                  \
 692        . = ALIGN(8);                                                   \
 693        *(.init.ramfs.info)
 694#else
 695#define INIT_RAM_FS
 696#endif
 697
 698/*
 699 * Default discarded sections.
 700 *
 701 * Some archs want to discard exit text/data at runtime rather than
 702 * link time due to cross-section references such as alt instructions,
 703 * bug table, eh_frame, etc.  DISCARDS must be the last of output
 704 * section definitions so that such archs put those in earlier section
 705 * definitions.
 706 */
 707#define DISCARDS                                                        \
 708        /DISCARD/ : {                                                   \
 709        EXIT_TEXT                                                       \
 710        EXIT_DATA                                                       \
 711        EXIT_CALL                                                       \
 712        *(.discard)                                                     \
 713        *(.discard.*)                                                   \
 714        }
 715
 716/**
 717 * PERCPU_INPUT - the percpu input sections
 718 * @cacheline: cacheline size
 719 *
 720 * The core percpu section names and core symbols which do not rely
 721 * directly upon load addresses.
 722 *
 723 * @cacheline is used to align subsections to avoid false cacheline
 724 * sharing between subsections for different purposes.
 725 */
 726#define PERCPU_INPUT(cacheline)                                         \
 727        VMLINUX_SYMBOL(__per_cpu_start) = .;                            \
 728        *(.data..percpu..first)                                         \
 729        . = ALIGN(PAGE_SIZE);                                           \
 730        *(.data..percpu..page_aligned)                                  \
 731        . = ALIGN(cacheline);                                           \
 732        *(.data..percpu..readmostly)                                    \
 733        . = ALIGN(cacheline);                                           \
 734        *(.data..percpu)                                                \
 735        *(.data..percpu..shared_aligned)                                \
 736        VMLINUX_SYMBOL(__per_cpu_end) = .;
 737
 738/**
 739 * PERCPU_VADDR - define output section for percpu area
 740 * @cacheline: cacheline size
 741 * @vaddr: explicit base address (optional)
 742 * @phdr: destination PHDR (optional)
 743 *
 744 * Macro which expands to output section for percpu area.
 745 *
 746 * @cacheline is used to align subsections to avoid false cacheline
 747 * sharing between subsections for different purposes.
 748 *
 749 * If @vaddr is not blank, it specifies explicit base address and all
 750 * percpu symbols will be offset from the given address.  If blank,
 751 * @vaddr always equals @laddr + LOAD_OFFSET.
 752 *
 753 * @phdr defines the output PHDR to use if not blank.  Be warned that
 754 * output PHDR is sticky.  If @phdr is specified, the next output
 755 * section in the linker script will go there too.  @phdr should have
 756 * a leading colon.
 757 *
 758 * Note that this macros defines __per_cpu_load as an absolute symbol.
 759 * If there is no need to put the percpu section at a predetermined
 760 * address, use PERCPU_SECTION.
 761 */
 762#define PERCPU_VADDR(cacheline, vaddr, phdr)                            \
 763        VMLINUX_SYMBOL(__per_cpu_load) = .;                             \
 764        .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load)         \
 765                                - LOAD_OFFSET) {                        \
 766                PERCPU_INPUT(cacheline)                                 \
 767        } phdr                                                          \
 768        . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
 769
 770/**
 771 * PERCPU_SECTION - define output section for percpu area, simple version
 772 * @cacheline: cacheline size
 773 *
 774 * Align to PAGE_SIZE and outputs output section for percpu area.  This
 775 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
 776 * __per_cpu_start will be identical.
 777 *
 778 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
 779 * except that __per_cpu_load is defined as a relative symbol against
 780 * .data..percpu which is required for relocatable x86_32 configuration.
 781 */
 782#define PERCPU_SECTION(cacheline)                                       \
 783        . = ALIGN(PAGE_SIZE);                                           \
 784        .data..percpu   : AT(ADDR(.data..percpu) - LOAD_OFFSET) {       \
 785                VMLINUX_SYMBOL(__per_cpu_load) = .;                     \
 786                PERCPU_INPUT(cacheline)                                 \
 787        }
 788
 789
 790/*
 791 * Definition of the high level *_SECTION macros
 792 * They will fit only a subset of the architectures
 793 */
 794
 795
 796/*
 797 * Writeable data.
 798 * All sections are combined in a single .data section.
 799 * The sections following CONSTRUCTORS are arranged so their
 800 * typical alignment matches.
 801 * A cacheline is typical/always less than a PAGE_SIZE so
 802 * the sections that has this restriction (or similar)
 803 * is located before the ones requiring PAGE_SIZE alignment.
 804 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
 805 * matches the requirement of PAGE_ALIGNED_DATA.
 806 *
 807 * use 0 as page_align if page_aligned data is not used */
 808#define RW_DATA_SECTION(cacheline, pagealigned, inittask)               \
 809        . = ALIGN(PAGE_SIZE);                                           \
 810        .data : AT(ADDR(.data) - LOAD_OFFSET) {                         \
 811                INIT_TASK_DATA(inittask)                                \
 812                NOSAVE_DATA                                             \
 813                PAGE_ALIGNED_DATA(pagealigned)                          \
 814                CACHELINE_ALIGNED_DATA(cacheline)                       \
 815                READ_MOSTLY_DATA(cacheline)                             \
 816                DATA_DATA                                               \
 817                CONSTRUCTORS                                            \
 818        }
 819
 820#define INIT_TEXT_SECTION(inittext_align)                               \
 821        . = ALIGN(inittext_align);                                      \
 822        .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {               \
 823                VMLINUX_SYMBOL(_sinittext) = .;                         \
 824                INIT_TEXT                                               \
 825                VMLINUX_SYMBOL(_einittext) = .;                         \
 826        }
 827
 828#define INIT_DATA_SECTION(initsetup_align)                              \
 829        .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {               \
 830                INIT_DATA                                               \
 831                INIT_SETUP(initsetup_align)                             \
 832                INIT_CALLS                                              \
 833                CON_INITCALL                                            \
 834                SECURITY_INITCALL                                       \
 835                INIT_RAM_FS                                             \
 836        }
 837
 838#define BSS_SECTION(sbss_align, bss_align, stop_align)                  \
 839        . = ALIGN(sbss_align);                                          \
 840        VMLINUX_SYMBOL(__bss_start) = .;                                \
 841        SBSS(sbss_align)                                                \
 842        BSS(bss_align)                                                  \
 843        . = ALIGN(stop_align);                                          \
 844        VMLINUX_SYMBOL(__bss_stop) = .;
 845
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