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 #include <linux/export.h>
  56
  57 /* Align . to a 8 byte boundary equals to maximum function alignment. */
  58 #define ALIGN_FUNCTION()  . = ALIGN(8)
  59
  60 /*
  61  * Align to a 32 byte boundary equal to the
  62  * alignment gcc 4.5 uses for a struct
  63  */
  64 #define STRUCT_ALIGNMENT 32
  65 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
  66
  67 /* The actual configuration determine if the init/exit sections
  68  * are handled as text/data or they can be discarded (which
  69  * often happens at runtime)
  70  */
  71 #ifdef CONFIG_HOTPLUG_CPU
  72 #define CPU_KEEP(sec)    *(.cpu##sec)
  73 #define CPU_DISCARD(sec)
  74 #else
  75 #define CPU_KEEP(sec)
  76 #define CPU_DISCARD(sec) *(.cpu##sec)
  77 #endif
  78
  79 #if defined(CONFIG_MEMORY_HOTPLUG)
  80 #define MEM_KEEP(sec)    *(.mem##sec)
  81 #define MEM_DISCARD(sec)
  82 #else
  83 #define MEM_KEEP(sec)
  84 #define MEM_DISCARD(sec) *(.mem##sec)
  85 #endif
  86
  87 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
  88 #define MCOUNT_REC()    . = ALIGN(8);                           \
  89                         VMLINUX_SYMBOL(__start_mcount_loc) = .; \
  90                         *(__mcount_loc)                         \
  91                         VMLINUX_SYMBOL(__stop_mcount_loc) = .;
  92 #else
  93 #define MCOUNT_REC()
  94 #endif
  95
  96 #ifdef CONFIG_TRACE_BRANCH_PROFILING
  97 #define LIKELY_PROFILE()        VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \
  98                                 *(_ftrace_annotated_branch)                           \
  99                                 VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .;
 100 #else
 101 #define LIKELY_PROFILE()
 102 #endif
 103
 104 #ifdef CONFIG_PROFILE_ALL_BRANCHES
 105 #define BRANCH_PROFILE()        VMLINUX_SYMBOL(__start_branch_profile) = .;   \
 106                                 *(_ftrace_branch)                             \
 107                                 VMLINUX_SYMBOL(__stop_branch_profile) = .;
 108 #else
 109 #define BRANCH_PROFILE()
 110 #endif
 111
 112 #ifdef CONFIG_KPROBES
 113 #define KPROBE_BLACKLIST()      . = ALIGN(8);                                 \
 114                                 VMLINUX_SYMBOL(__start_kprobe_blacklist) = .; \
 115                                 *(_kprobe_blacklist)                          \
 116                                 VMLINUX_SYMBOL(__stop_kprobe_blacklist) = .;
 117 #else
 118 #define KPROBE_BLACKLIST()
 119 #endif
 120
 121 #ifdef CONFIG_EVENT_TRACING
 122 #define FTRACE_EVENTS() . = ALIGN(8);                                   \
 123                         VMLINUX_SYMBOL(__start_ftrace_events) = .;      \
 124                         *(_ftrace_events)                               \
 125                         VMLINUX_SYMBOL(__stop_ftrace_events) = .;
 126 #else
 127 #define FTRACE_EVENTS()
 128 #endif
 129
 130 #ifdef CONFIG_TRACING
 131 #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .;      \
 132                          *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \
 133                          VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;
 134 #define TRACEPOINT_STR() VMLINUX_SYMBOL(__start___tracepoint_str) = .;  \
 135                          *(__tracepoint_str) /* Trace_printk fmt' pointer */ \
 136                          VMLINUX_SYMBOL(__stop___tracepoint_str) = .;
 137 #else
 138 #define TRACE_PRINTKS()
 139 #define TRACEPOINT_STR()
 140 #endif
 141
 142 #ifdef CONFIG_FTRACE_SYSCALLS
 143 #define TRACE_SYSCALLS() . = ALIGN(8);                                  \
 144                          VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \
 145                          *(__syscalls_metadata)                         \
 146                          VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
 147 #else
 148 #define TRACE_SYSCALLS()
 149 #endif
 150
 151
 152 #define ___OF_TABLE(cfg, name)  _OF_TABLE_##cfg(name)
 153 #define __OF_TABLE(cfg, name)   ___OF_TABLE(cfg, name)
 154 #define OF_TABLE(cfg, name)     __OF_TABLE(config_enabled(cfg), name)
 155 #define _OF_TABLE_0(name)
 156 #define _OF_TABLE_1(name)                                               \
 157         . = ALIGN(8);                                                   \
 158         VMLINUX_SYMBOL(__##name##_of_table) = .;                        \
 159         *(__##name##_of_table)                                          \
 160         *(__##name##_of_table_end)
 161
 162 #define CLKSRC_OF_TABLES()      OF_TABLE(CONFIG_CLKSRC_OF, clksrc)
 163 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
 164 #define CLK_OF_TABLES()         OF_TABLE(CONFIG_COMMON_CLK, clk)
 165 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
 166 #define CPU_METHOD_OF_TABLES()  OF_TABLE(CONFIG_SMP, cpu_method)
 167 #define EARLYCON_OF_TABLES()    OF_TABLE(CONFIG_SERIAL_EARLYCON, earlycon)
 168
 169 #define KERNEL_DTB()                                                    \
 170         STRUCT_ALIGN();                                                 \
 171         VMLINUX_SYMBOL(__dtb_start) = .;                                \
 172         *(.dtb.init.rodata)                                             \
 173         VMLINUX_SYMBOL(__dtb_end) = .;
 174
 175 /* .data section */
 176 #define DATA_DATA                                                       \
 177         *(.data)                                                        \
 178         *(.ref.data)                                                    \
 179         *(.data..shared_aligned) /* percpu related */                   \
 180         MEM_KEEP(init.data)                                             \
 181         MEM_KEEP(exit.data)                                             \
 182         *(.data.unlikely)                                               \
 183         STRUCT_ALIGN();                                                 \
 184         *(__tracepoints)                                                \
 185         /* implement dynamic printk debug */                            \
 186         . = ALIGN(8);                                                   \
 187         VMLINUX_SYMBOL(__start___jump_table) = .;                       \
 188         *(__jump_table)                                                 \
 189         VMLINUX_SYMBOL(__stop___jump_table) = .;                        \
 190         . = ALIGN(8);                                                   \
 191         VMLINUX_SYMBOL(__start___verbose) = .;                          \
 192         *(__verbose)                                                    \
 193         VMLINUX_SYMBOL(__stop___verbose) = .;                           \
 194         LIKELY_PROFILE()                                                \
 195         BRANCH_PROFILE()                                                \
 196         TRACE_PRINTKS()                                                 \
 197         TRACEPOINT_STR()
 198
 199 /*
 200  * Data section helpers
 201  */
 202 #define NOSAVE_DATA                                                     \
 203         . = ALIGN(PAGE_SIZE);                                           \
 204         VMLINUX_SYMBOL(__nosave_begin) = .;                             \
 205         *(.data..nosave)                                                \
 206         . = ALIGN(PAGE_SIZE);                                           \
 207         VMLINUX_SYMBOL(__nosave_end) = .;
 208
 209 #define PAGE_ALIGNED_DATA(page_align)                                   \
 210         . = ALIGN(page_align);                                          \
 211         *(.data..page_aligned)
 212
 213 #define READ_MOSTLY_DATA(align)                                         \
 214         . = ALIGN(align);                                               \
 215         *(.data..read_mostly)                                           \
 216         . = ALIGN(align);
 217
 218 #define CACHELINE_ALIGNED_DATA(align)                                   \
 219         . = ALIGN(align);                                               \
 220         *(.data..cacheline_aligned)
 221
 222 #define INIT_TASK_DATA(align)                                           \
 223         . = ALIGN(align);                                               \
 224         *(.data..init_task)
 225
 226 /*
 227  * Read only Data
 228  */
 229 #define RO_DATA_SECTION(align)                                          \
 230         . = ALIGN((align));                                             \
 231         .rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {           \
 232                 VMLINUX_SYMBOL(__start_rodata) = .;                     \
 233                 *(.rodata) *(.rodata.*)                                 \
 234                 *(__vermagic)           /* Kernel version magic */      \
 235                 . = ALIGN(8);                                           \
 236                 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .;         \
 237                 *(__tracepoints_ptrs)   /* Tracepoints: pointer array */\
 238                 VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .;          \
 239                 *(__tracepoints_strings)/* Tracepoints: strings */      \
 240         }                                                               \
 241                                                                         \
 242         .rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {          \
 243                 *(.rodata1)                                             \
 244         }                                                               \
 245                                                                         \
 246         BUG_TABLE                                                       \
 247                                                                         \
 248         /* PCI quirks */                                                \
 249         .pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {        \
 250                 VMLINUX_SYMBOL(__start_pci_fixups_early) = .;           \
 251                 *(.pci_fixup_early)                                     \
 252                 VMLINUX_SYMBOL(__end_pci_fixups_early) = .;             \
 253                 VMLINUX_SYMBOL(__start_pci_fixups_header) = .;          \
 254                 *(.pci_fixup_header)                                    \
 255                 VMLINUX_SYMBOL(__end_pci_fixups_header) = .;            \
 256                 VMLINUX_SYMBOL(__start_pci_fixups_final) = .;           \
 257                 *(.pci_fixup_final)                                     \
 258                 VMLINUX_SYMBOL(__end_pci_fixups_final) = .;             \
 259                 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .;          \
 260                 *(.pci_fixup_enable)                                    \
 261                 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .;            \
 262                 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .;          \
 263                 *(.pci_fixup_resume)                                    \
 264                 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .;            \
 265                 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .;    \
 266                 *(.pci_fixup_resume_early)                              \
 267                 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .;      \
 268                 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .;         \
 269                 *(.pci_fixup_suspend)                                   \
 270                 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .;           \
 271                 VMLINUX_SYMBOL(__start_pci_fixups_suspend_late) = .;    \
 272                 *(.pci_fixup_suspend_late)                              \
 273                 VMLINUX_SYMBOL(__end_pci_fixups_suspend_late) = .;      \
 274         }                                                               \
 275                                                                         \
 276         /* Built-in firmware blobs */                                   \
 277         .builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {      \
 278                 VMLINUX_SYMBOL(__start_builtin_fw) = .;                 \
 279                 *(.builtin_fw)                                          \
 280                 VMLINUX_SYMBOL(__end_builtin_fw) = .;                   \
 281         }                                                               \
 282                                                                         \
 283         TRACEDATA                                                       \
 284                                                                         \
 285         /* Kernel symbol table: Normal symbols */                       \
 286         __ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {         \
 287                 VMLINUX_SYMBOL(__start___ksymtab) = .;                  \
 288                 *(SORT(___ksymtab+*))                                   \
 289                 VMLINUX_SYMBOL(__stop___ksymtab) = .;                   \
 290         }                                                               \
 291                                                                         \
 292         /* Kernel symbol table: GPL-only symbols */                     \
 293         __ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {     \
 294                 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .;              \
 295                 *(SORT(___ksymtab_gpl+*))                               \
 296                 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .;               \
 297         }                                                               \
 298                                                                         \
 299         /* Kernel symbol table: Normal unused symbols */                \
 300         __ksymtab_unused  : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) {  \
 301                 VMLINUX_SYMBOL(__start___ksymtab_unused) = .;           \
 302                 *(SORT(___ksymtab_unused+*))                            \
 303                 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .;            \
 304         }                                                               \
 305                                                                         \
 306         /* Kernel symbol table: GPL-only unused symbols */              \
 307         __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
 308                 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .;       \
 309                 *(SORT(___ksymtab_unused_gpl+*))                        \
 310                 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .;        \
 311         }                                                               \
 312                                                                         \
 313         /* Kernel symbol table: GPL-future-only symbols */              \
 314         __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
 315                 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .;       \
 316                 *(SORT(___ksymtab_gpl_future+*))                        \
 317                 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .;        \
 318         }                                                               \
 319                                                                         \
 320         /* Kernel symbol table: Normal symbols */                       \
 321         __kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {         \
 322                 VMLINUX_SYMBOL(__start___kcrctab) = .;                  \
 323                 *(SORT(___kcrctab+*))                                   \
 324                 VMLINUX_SYMBOL(__stop___kcrctab) = .;                   \
 325         }                                                               \
 326                                                                         \
 327         /* Kernel symbol table: GPL-only symbols */                     \
 328         __kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {     \
 329                 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .;              \
 330                 *(SORT(___kcrctab_gpl+*))                               \
 331                 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .;               \
 332         }                                                               \
 333                                                                         \
 334         /* Kernel symbol table: Normal unused symbols */                \
 335         __kcrctab_unused  : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) {  \
 336                 VMLINUX_SYMBOL(__start___kcrctab_unused) = .;           \
 337                 *(SORT(___kcrctab_unused+*))                            \
 338                 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .;            \
 339         }                                                               \
 340                                                                         \
 341         /* Kernel symbol table: GPL-only unused symbols */              \
 342         __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
 343                 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .;       \
 344                 *(SORT(___kcrctab_unused_gpl+*))                        \
 345                 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .;        \
 346         }                                                               \
 347                                                                         \
 348         /* Kernel symbol table: GPL-future-only symbols */              \
 349         __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
 350                 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .;       \
 351                 *(SORT(___kcrctab_gpl_future+*))                        \
 352                 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .;        \
 353         }                                                               \
 354                                                                         \
 355         /* Kernel symbol table: strings */                              \
 356         __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
 357                 *(__ksymtab_strings)                                    \
 358         }                                                               \
 359                                                                         \
 360         /* __*init sections */                                          \
 361         __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {         \
 362                 *(.ref.rodata)                                          \
 363                 MEM_KEEP(init.rodata)                                   \
 364                 MEM_KEEP(exit.rodata)                                   \
 365         }                                                               \
 366                                                                         \
 367         /* Built-in module parameters. */                               \
 368         __param : AT(ADDR(__param) - LOAD_OFFSET) {                     \
 369                 VMLINUX_SYMBOL(__start___param) = .;                    \
 370                 *(__param)                                              \
 371                 VMLINUX_SYMBOL(__stop___param) = .;                     \
 372         }                                                               \
 373                                                                         \
 374         /* Built-in module versions. */                                 \
 375         __modver : AT(ADDR(__modver) - LOAD_OFFSET) {                   \
 376                 VMLINUX_SYMBOL(__start___modver) = .;                   \
 377                 *(__modver)                                             \
 378                 VMLINUX_SYMBOL(__stop___modver) = .;                    \
 379                 . = ALIGN((align));                                     \
 380                 VMLINUX_SYMBOL(__end_rodata) = .;                       \
 381         }                                                               \
 382         . = ALIGN((align));
 383
 384 /* RODATA & RO_DATA provided for backward compatibility.
 385  * All archs are supposed to use RO_DATA() */
 386 #define RODATA          RO_DATA_SECTION(4096)
 387 #define RO_DATA(align)  RO_DATA_SECTION(align)
 388
 389 #define SECURITY_INIT                                                   \
 390         .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
 391                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 392                 *(.security_initcall.init)                              \
 393                 VMLINUX_SYMBOL(__security_initcall_end) = .;            \
 394         }
 395
 396 /* .text section. Map to function alignment to avoid address changes
 397  * during second ld run in second ld pass when generating System.map */
 398 #define TEXT_TEXT                                                       \
 399                 ALIGN_FUNCTION();                                       \
 400                 *(.text.hot)                                            \
 401                 *(.text)                                                \
 402                 *(.ref.text)                                            \
 403         MEM_KEEP(init.text)                                             \
 404         MEM_KEEP(exit.text)                                             \
 405                 *(.text.unlikely)
 406
 407
 408 /* sched.text is aling to function alignment to secure we have same
 409  * address even at second ld pass when generating System.map */
 410 #define SCHED_TEXT                                                      \
 411                 ALIGN_FUNCTION();                                       \
 412                 VMLINUX_SYMBOL(__sched_text_start) = .;                 \
 413                 *(.sched.text)                                          \
 414                 VMLINUX_SYMBOL(__sched_text_end) = .;
 415
 416 /* spinlock.text is aling to function alignment to secure we have same
 417  * address even at second ld pass when generating System.map */
 418 #define LOCK_TEXT                                                       \
 419                 ALIGN_FUNCTION();                                       \
 420                 VMLINUX_SYMBOL(__lock_text_start) = .;                  \
 421                 *(.spinlock.text)                                       \
 422                 VMLINUX_SYMBOL(__lock_text_end) = .;
 423
 424 #define KPROBES_TEXT                                                    \
 425                 ALIGN_FUNCTION();                                       \
 426                 VMLINUX_SYMBOL(__kprobes_text_start) = .;               \
 427                 *(.kprobes.text)                                        \
 428                 VMLINUX_SYMBOL(__kprobes_text_end) = .;
 429
 430 #define ENTRY_TEXT                                                      \
 431                 ALIGN_FUNCTION();                                       \
 432                 VMLINUX_SYMBOL(__entry_text_start) = .;                 \
 433                 *(.entry.text)                                          \
 434                 VMLINUX_SYMBOL(__entry_text_end) = .;
 435
 436 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 437 #define IRQENTRY_TEXT                                                   \
 438                 ALIGN_FUNCTION();                                       \
 439                 VMLINUX_SYMBOL(__irqentry_text_start) = .;              \
 440                 *(.irqentry.text)                                       \
 441                 VMLINUX_SYMBOL(__irqentry_text_end) = .;
 442 #else
 443 #define IRQENTRY_TEXT
 444 #endif
 445
 446 /* Section used for early init (in .S files) */
 447 #define HEAD_TEXT  *(.head.text)
 448
 449 #define HEAD_TEXT_SECTION                                                       \
 450         .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {               \
 451                 HEAD_TEXT                                               \
 452         }
 453
 454 /*
 455  * Exception table
 456  */
 457 #define EXCEPTION_TABLE(align)                                          \
 458         . = ALIGN(align);                                               \
 459         __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {               \
 460                 VMLINUX_SYMBOL(__start___ex_table) = .;                 \
 461                 *(__ex_table)                                           \
 462                 VMLINUX_SYMBOL(__stop___ex_table) = .;                  \
 463         }
 464
 465 /*
 466  * Init task
 467  */
 468 #define INIT_TASK_DATA_SECTION(align)                                   \
 469         . = ALIGN(align);                                               \
 470         .data..init_task :  AT(ADDR(.data..init_task) - LOAD_OFFSET) {  \
 471                 INIT_TASK_DATA(align)                                   \
 472         }
 473
 474 #ifdef CONFIG_CONSTRUCTORS
 475 #define KERNEL_CTORS()  . = ALIGN(8);                      \
 476                         VMLINUX_SYMBOL(__ctors_start) = .; \
 477                         *(.ctors)                          \
 478                         *(.init_array)                     \
 479                         VMLINUX_SYMBOL(__ctors_end) = .;
 480 #else
 481 #define KERNEL_CTORS()
 482 #endif
 483
 484 /* init and exit section handling */
 485 #define INIT_DATA                                                       \
 486         *(.init.data)                                                   \
 487         MEM_DISCARD(init.data)                                          \
 488         KERNEL_CTORS()                                                  \
 489         MCOUNT_REC()                                                    \
 490         *(.init.rodata)                                                 \
 491         FTRACE_EVENTS()                                                 \
 492         TRACE_SYSCALLS()                                                \
 493         KPROBE_BLACKLIST()                                              \
 494         MEM_DISCARD(init.rodata)                                        \
 495         CLK_OF_TABLES()                                                 \
 496         RESERVEDMEM_OF_TABLES()                                         \
 497         CLKSRC_OF_TABLES()                                              \
 498         CPU_METHOD_OF_TABLES()                                          \
 499         KERNEL_DTB()                                                    \
 500         IRQCHIP_OF_MATCH_TABLE()                                        \
 501         EARLYCON_OF_TABLES()
 502
 503 #define INIT_TEXT                                                       \
 504         *(.init.text)                                                   \
 505         MEM_DISCARD(init.text)
 506
 507 #define EXIT_DATA                                                       \
 508         *(.exit.data)                                                   \
 509         MEM_DISCARD(exit.data)                                          \
 510         MEM_DISCARD(exit.rodata)
 511
 512 #define EXIT_TEXT                                                       \
 513         *(.exit.text)                                                   \
 514         MEM_DISCARD(exit.text)
 515
 516 #define EXIT_CALL                                                       \
 517         *(.exitcall.exit)
 518
 519 /*
 520  * bss (Block Started by Symbol) - uninitialized data
 521  * zeroed during startup
 522  */
 523 #define SBSS(sbss_align)                                                \
 524         . = ALIGN(sbss_align);                                          \
 525         .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {                         \
 526                 *(.sbss)                                                \
 527                 *(.scommon)                                             \
 528         }
 529
 530 /*
 531  * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
 532  * sections to the front of bss.
 533  */
 534 #ifndef BSS_FIRST_SECTIONS
 535 #define BSS_FIRST_SECTIONS
 536 #endif
 537
 538 #define BSS(bss_align)                                                  \
 539         . = ALIGN(bss_align);                                           \
 540         .bss : AT(ADDR(.bss) - LOAD_OFFSET) {                           \
 541                 BSS_FIRST_SECTIONS                                      \
 542                 *(.bss..page_aligned)                                   \
 543                 *(.dynbss)                                              \
 544                 *(.bss)                                                 \
 545                 *(COMMON)                                               \
 546         }
 547
 548 /*
 549  * DWARF debug sections.
 550  * Symbols in the DWARF debugging sections are relative to
 551  * the beginning of the section so we begin them at 0.
 552  */
 553 #define DWARF_DEBUG                                                     \
 554                 /* DWARF 1 */                                           \
 555                 .debug          0 : { *(.debug) }                       \
 556                 .line           0 : { *(.line) }                        \
 557                 /* GNU DWARF 1 extensions */                            \
 558                 .debug_srcinfo  0 : { *(.debug_srcinfo) }               \
 559                 .debug_sfnames  0 : { *(.debug_sfnames) }               \
 560                 /* DWARF 1.1 and DWARF 2 */                             \
 561                 .debug_aranges  0 : { *(.debug_aranges) }               \
 562                 .debug_pubnames 0 : { *(.debug_pubnames) }              \
 563                 /* DWARF 2 */                                           \
 564                 .debug_info     0 : { *(.debug_info                     \
 565                                 .gnu.linkonce.wi.*) }                   \
 566                 .debug_abbrev   0 : { *(.debug_abbrev) }                \
 567                 .debug_line     0 : { *(.debug_line) }                  \
 568                 .debug_frame    0 : { *(.debug_frame) }                 \
 569                 .debug_str      0 : { *(.debug_str) }                   \
 570                 .debug_loc      0 : { *(.debug_loc) }                   \
 571                 .debug_macinfo  0 : { *(.debug_macinfo) }               \
 572                 /* SGI/MIPS DWARF 2 extensions */                       \
 573                 .debug_weaknames 0 : { *(.debug_weaknames) }            \
 574                 .debug_funcnames 0 : { *(.debug_funcnames) }            \
 575                 .debug_typenames 0 : { *(.debug_typenames) }            \
 576                 .debug_varnames  0 : { *(.debug_varnames) }             \
 577
 578                 /* Stabs debugging sections.  */
 579 #define STABS_DEBUG                                                     \
 580                 .stab 0 : { *(.stab) }                                  \
 581                 .stabstr 0 : { *(.stabstr) }                            \
 582                 .stab.excl 0 : { *(.stab.excl) }                        \
 583                 .stab.exclstr 0 : { *(.stab.exclstr) }                  \
 584                 .stab.index 0 : { *(.stab.index) }                      \
 585                 .stab.indexstr 0 : { *(.stab.indexstr) }                \
 586                 .comment 0 : { *(.comment) }
 587
 588 #ifdef CONFIG_GENERIC_BUG
 589 #define BUG_TABLE                                                       \
 590         . = ALIGN(8);                                                   \
 591         __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {             \
 592                 VMLINUX_SYMBOL(__start___bug_table) = .;                \
 593                 *(__bug_table)                                          \
 594                 VMLINUX_SYMBOL(__stop___bug_table) = .;                 \
 595         }
 596 #else
 597 #define BUG_TABLE
 598 #endif
 599
 600 #ifdef CONFIG_PM_TRACE
 601 #define TRACEDATA                                                       \
 602         . = ALIGN(4);                                                   \
 603         .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {               \
 604                 VMLINUX_SYMBOL(__tracedata_start) = .;                  \
 605                 *(.tracedata)                                           \
 606                 VMLINUX_SYMBOL(__tracedata_end) = .;                    \
 607         }
 608 #else
 609 #define TRACEDATA
 610 #endif
 611
 612 #define NOTES                                                           \
 613         .notes : AT(ADDR(.notes) - LOAD_OFFSET) {                       \
 614                 VMLINUX_SYMBOL(__start_notes) = .;                      \
 615                 *(.note.*)                                              \
 616                 VMLINUX_SYMBOL(__stop_notes) = .;                       \
 617         }
 618
 619 #define INIT_SETUP(initsetup_align)                                     \
 620                 . = ALIGN(initsetup_align);                             \
 621                 VMLINUX_SYMBOL(__setup_start) = .;                      \
 622                 *(.init.setup)                                          \
 623                 VMLINUX_SYMBOL(__setup_end) = .;
 624
 625 #define INIT_CALLS_LEVEL(level)                                         \
 626                 VMLINUX_SYMBOL(__initcall##level##_start) = .;          \
 627                 *(.initcall##level##.init)                              \
 628                 *(.initcall##level##s.init)                             \
 629
 630 #define INIT_CALLS                                                      \
 631                 VMLINUX_SYMBOL(__initcall_start) = .;                   \
 632                 *(.initcallearly.init)                                  \
 633                 INIT_CALLS_LEVEL(0)                                     \
 634                 INIT_CALLS_LEVEL(1)                                     \
 635                 INIT_CALLS_LEVEL(2)                                     \
 636                 INIT_CALLS_LEVEL(3)                                     \
 637                 INIT_CALLS_LEVEL(4)                                     \
 638                 INIT_CALLS_LEVEL(5)                                     \
 639                 INIT_CALLS_LEVEL(rootfs)                                \
 640                 INIT_CALLS_LEVEL(6)                                     \
 641                 INIT_CALLS_LEVEL(7)                                     \
 642                 VMLINUX_SYMBOL(__initcall_end) = .;
 643
 644 #define CON_INITCALL                                                    \
 645                 VMLINUX_SYMBOL(__con_initcall_start) = .;               \
 646                 *(.con_initcall.init)                                   \
 647                 VMLINUX_SYMBOL(__con_initcall_end) = .;
 648
 649 #define SECURITY_INITCALL                                               \
 650                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 651                 *(.security_initcall.init)                              \
 652                 VMLINUX_SYMBOL(__security_initcall_end) = .;
 653
 654 #ifdef CONFIG_BLK_DEV_INITRD
 655 #define INIT_RAM_FS                                                     \
 656         . = ALIGN(4);                                                   \
 657         VMLINUX_SYMBOL(__initramfs_start) = .;                          \
 658         *(.init.ramfs)                                                  \
 659         . = ALIGN(8);                                                   \
 660         *(.init.ramfs.info)
 661 #else
 662 #define INIT_RAM_FS
 663 #endif
 664
 665 /*
 666  * Default discarded sections.
 667  *
 668  * Some archs want to discard exit text/data at runtime rather than
 669  * link time due to cross-section references such as alt instructions,
 670  * bug table, eh_frame, etc.  DISCARDS must be the last of output
 671  * section definitions so that such archs put those in earlier section
 672  * definitions.
 673  */
 674 #define DISCARDS                                                        \
 675         /DISCARD/ : {                                                   \
 676         EXIT_TEXT                                                       \
 677         EXIT_DATA                                                       \
 678         EXIT_CALL                                                       \
 679         *(.discard)                                                     \
 680         *(.discard.*)                                                   \
 681         }
 682
 683 /**
 684  * PERCPU_INPUT - the percpu input sections
 685  * @cacheline: cacheline size
 686  *
 687  * The core percpu section names and core symbols which do not rely
 688  * directly upon load addresses.
 689  *
 690  * @cacheline is used to align subsections to avoid false cacheline
 691  * sharing between subsections for different purposes.
 692  */
 693 #define PERCPU_INPUT(cacheline)                                         \
 694         VMLINUX_SYMBOL(__per_cpu_start) = .;                            \
 695         *(.data..percpu..first)                                         \
 696         . = ALIGN(PAGE_SIZE);                                           \
 697         *(.data..percpu..page_aligned)                                  \
 698         . = ALIGN(cacheline);                                           \
 699         *(.data..percpu..read_mostly)                                   \
 700         . = ALIGN(cacheline);                                           \
 701         *(.data..percpu)                                                \
 702         *(.data..percpu..shared_aligned)                                \
 703         VMLINUX_SYMBOL(__per_cpu_end) = .;
 704
 705 /**
 706  * PERCPU_VADDR - define output section for percpu area
 707  * @cacheline: cacheline size
 708  * @vaddr: explicit base address (optional)
 709  * @phdr: destination PHDR (optional)
 710  *
 711  * Macro which expands to output section for percpu area.
 712  *
 713  * @cacheline is used to align subsections to avoid false cacheline
 714  * sharing between subsections for different purposes.
 715  *
 716  * If @vaddr is not blank, it specifies explicit base address and all
 717  * percpu symbols will be offset from the given address.  If blank,
 718  * @vaddr always equals @laddr + LOAD_OFFSET.
 719  *
 720  * @phdr defines the output PHDR to use if not blank.  Be warned that
 721  * output PHDR is sticky.  If @phdr is specified, the next output
 722  * section in the linker script will go there too.  @phdr should have
 723  * a leading colon.
 724  *
 725  * Note that this macros defines __per_cpu_load as an absolute symbol.
 726  * If there is no need to put the percpu section at a predetermined
 727  * address, use PERCPU_SECTION.
 728  */
 729 #define PERCPU_VADDR(cacheline, vaddr, phdr)                            \
 730         VMLINUX_SYMBOL(__per_cpu_load) = .;                             \
 731         .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load)         \
 732                                 - LOAD_OFFSET) {                        \
 733                 PERCPU_INPUT(cacheline)                                 \
 734         } phdr                                                          \
 735         . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
 736
 737 /**
 738  * PERCPU_SECTION - define output section for percpu area, simple version
 739  * @cacheline: cacheline size
 740  *
 741  * Align to PAGE_SIZE and outputs output section for percpu area.  This
 742  * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
 743  * __per_cpu_start will be identical.
 744  *
 745  * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
 746  * except that __per_cpu_load is defined as a relative symbol against
 747  * .data..percpu which is required for relocatable x86_32 configuration.
 748  */
 749 #define PERCPU_SECTION(cacheline)                                       \
 750         . = ALIGN(PAGE_SIZE);                                           \
 751         .data..percpu   : AT(ADDR(.data..percpu) - LOAD_OFFSET) {       \
 752                 VMLINUX_SYMBOL(__per_cpu_load) = .;                     \
 753                 PERCPU_INPUT(cacheline)                                 \
 754         }
 755
 756
 757 /*
 758  * Definition of the high level *_SECTION macros
 759  * They will fit only a subset of the architectures
 760  */
 761
 762
 763 /*
 764  * Writeable data.
 765  * All sections are combined in a single .data section.
 766  * The sections following CONSTRUCTORS are arranged so their
 767  * typical alignment matches.
 768  * A cacheline is typical/always less than a PAGE_SIZE so
 769  * the sections that has this restriction (or similar)
 770  * is located before the ones requiring PAGE_SIZE alignment.
 771  * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
 772  * matches the requirement of PAGE_ALIGNED_DATA.
 773  *
 774  * use 0 as page_align if page_aligned data is not used */
 775 #define RW_DATA_SECTION(cacheline, pagealigned, inittask)               \
 776         . = ALIGN(PAGE_SIZE);                                           \
 777         .data : AT(ADDR(.data) - LOAD_OFFSET) {                         \
 778                 INIT_TASK_DATA(inittask)                                \
 779                 NOSAVE_DATA                                             \
 780                 PAGE_ALIGNED_DATA(pagealigned)                          \
 781                 CACHELINE_ALIGNED_DATA(cacheline)                       \
 782                 READ_MOSTLY_DATA(cacheline)                             \
 783                 DATA_DATA                                               \
 784                 CONSTRUCTORS                                            \
 785         }
 786
 787 #define INIT_TEXT_SECTION(inittext_align)                               \
 788         . = ALIGN(inittext_align);                                      \
 789         .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {               \
 790                 VMLINUX_SYMBOL(_sinittext) = .;                         \
 791                 INIT_TEXT                                               \
 792                 VMLINUX_SYMBOL(_einittext) = .;                         \
 793         }
 794
 795 #define INIT_DATA_SECTION(initsetup_align)                              \
 796         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {               \
 797                 INIT_DATA                                               \
 798                 INIT_SETUP(initsetup_align)                             \
 799                 INIT_CALLS                                              \
 800                 CON_INITCALL                                            \
 801                 SECURITY_INITCALL                                       \
 802                 INIT_RAM_FS                                             \
 803         }
 804
 805 #define BSS_SECTION(sbss_align, bss_align, stop_align)                  \
 806         . = ALIGN(sbss_align);                                          \
 807         VMLINUX_SYMBOL(__bss_start) = .;                                \
 808         SBSS(sbss_align)                                                \
 809         BSS(bss_align)                                                  \
 810         . = ALIGN(stop_align);                                          \
 811         VMLINUX_SYMBOL(__bss_stop) = .;