include/asm-generic/vmlinux.lds.h

   1 /*
   2  * Helper macros to support writing architecture specific
   3  * linker scripts.
   4  *
   5  * A minimal linker scripts has following content:
   6  * [This is a sample, architectures may have special requiriements]
   7  *
   8  * OUTPUT_FORMAT(...)
   9  * OUTPUT_ARCH(...)
  10  * ENTRY(...)
  11  * SECTIONS
  12  * {
  13  *      . = START;
  14  *      __init_begin = .;
  15  *      HEAD_TEXT_SECTION
  16  *      INIT_TEXT_SECTION(PAGE_SIZE)
  17  *      INIT_DATA_SECTION(...)
  18  *      PERCPU_SECTION(CACHELINE_SIZE)
  19  *      __init_end = .;
  20  *
  21  *      _stext = .;
  22  *      TEXT_SECTION = 0
  23  *      _etext = .;
  24  *
  25  *      _sdata = .;
  26  *      RO_DATA_SECTION(PAGE_SIZE)
  27  *      RW_DATA_SECTION(...)
  28  *      _edata = .;
  29  *
  30  *      EXCEPTION_TABLE(...)
  31  *      NOTES
  32  *
  33  *      BSS_SECTION(0, 0, 0)
  34  *      _end = .;
  35  *
  36  *      STABS_DEBUG
  37  *      DWARF_DEBUG
  38  *
  39  *      DISCARDS                // must be the last
  40  * }
  41  *
  42  * [__init_begin, __init_end] is the init section that may be freed after init
  43  * [_stext, _etext] is the text section
  44  * [_sdata, _edata] is the data section
  45  *
  46  * Some of the included output section have their own set of constants.
  47  * Examples are: [__initramfs_start, __initramfs_end] for initramfs and
  48  *               [__nosave_begin, __nosave_end] for the nosave data
  49  */
  50
  51 #ifndef LOAD_OFFSET
  52 #define LOAD_OFFSET 0
  53 #endif
  54
  55 #ifndef SYMBOL_PREFIX
  56 #define VMLINUX_SYMBOL(sym) sym
  57 #else
  58 #define PASTE2(x,y) x##y
  59 #define PASTE(x,y) PASTE2(x,y)
  60 #define VMLINUX_SYMBOL(sym) PASTE(SYMBOL_PREFIX, sym)
  61 #endif
  62
  63 /* Align . to a 8 byte boundary equals to maximum function alignment. */
  64 #define ALIGN_FUNCTION()  . = ALIGN(8)
  65
  66 /*
  67  * Align to a 32 byte boundary equal to the
  68  * alignment gcc 4.5 uses for a struct
  69  */
  70 #define STRUCT_ALIGNMENT 32
  71 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
  72
  73 /* The actual configuration determine if the init/exit sections
  74  * are handled as text/data or they can be discarded (which
  75  * often happens at runtime)
  76  */
  77 #ifdef CONFIG_HOTPLUG
  78 #define DEV_KEEP(sec)    *(.dev##sec)
  79 #define DEV_DISCARD(sec)
  80 #else
  81 #define DEV_KEEP(sec)
  82 #define DEV_DISCARD(sec) *(.dev##sec)
  83 #endif
  84
  85 #ifdef CONFIG_HOTPLUG_CPU
  86 #define CPU_KEEP(sec)    *(.cpu##sec)
  87 #define CPU_DISCARD(sec)
  88 #else
  89 #define CPU_KEEP(sec)
  90 #define CPU_DISCARD(sec) *(.cpu##sec)
  91 #endif
  92
  93 #if defined(CONFIG_MEMORY_HOTPLUG)
  94 #define MEM_KEEP(sec)    *(.mem##sec)
  95 #define MEM_DISCARD(sec)
  96 #else
  97 #define MEM_KEEP(sec)
  98 #define MEM_DISCARD(sec) *(.mem##sec)
  99 #endif
 100
 101 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
 102 #define MCOUNT_REC()    . = ALIGN(8);                           \
 103                         VMLINUX_SYMBOL(__start_mcount_loc) = .; \
 104                         *(__mcount_loc)                         \
 105                         VMLINUX_SYMBOL(__stop_mcount_loc) = .;
 106 #else
 107 #define MCOUNT_REC()
 108 #endif
 109
 110 #ifdef CONFIG_TRACE_BRANCH_PROFILING
 111 #define LIKELY_PROFILE()        VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \
 112                                 *(_ftrace_annotated_branch)                           \
 113                                 VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .;
 114 #else
 115 #define LIKELY_PROFILE()
 116 #endif
 117
 118 #ifdef CONFIG_PROFILE_ALL_BRANCHES
 119 #define BRANCH_PROFILE()        VMLINUX_SYMBOL(__start_branch_profile) = .;   \
 120                                 *(_ftrace_branch)                             \
 121                                 VMLINUX_SYMBOL(__stop_branch_profile) = .;
 122 #else
 123 #define BRANCH_PROFILE()
 124 #endif
 125
 126 #ifdef CONFIG_EVENT_TRACING
 127 #define FTRACE_EVENTS() . = ALIGN(8);                                   \
 128                         VMLINUX_SYMBOL(__start_ftrace_events) = .;      \
 129                         *(_ftrace_events)                               \
 130                         VMLINUX_SYMBOL(__stop_ftrace_events) = .;
 131 #else
 132 #define FTRACE_EVENTS()
 133 #endif
 134
 135 #ifdef CONFIG_TRACING
 136 #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .;      \
 137                          *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \
 138                          VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;
 139 #else
 140 #define TRACE_PRINTKS()
 141 #endif
 142
 143 #ifdef CONFIG_FTRACE_SYSCALLS
 144 #define TRACE_SYSCALLS() . = ALIGN(8);                                  \
 145                          VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \
 146                          *(__syscalls_metadata)                         \
 147                          VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
 148 #else
 149 #define TRACE_SYSCALLS()
 150 #endif
 151
 152
 153 #define KERNEL_DTB()                                                    \
 154         STRUCT_ALIGN();                                                 \
 155         VMLINUX_SYMBOL(__dtb_start) = .;                                \
 156         *(.dtb.init.rodata)                                             \
 157         VMLINUX_SYMBOL(__dtb_end) = .;
 158
 159 /* .data section */
 160 #define DATA_DATA                                                       \
 161         *(.data)                                                        \
 162         *(.ref.data)                                                    \
 163         *(.data..shared_aligned) /* percpu related */                   \
 164         DEV_KEEP(init.data)                                             \
 165         DEV_KEEP(exit.data)                                             \
 166         CPU_KEEP(init.data)                                             \
 167         CPU_KEEP(exit.data)                                             \
 168         MEM_KEEP(init.data)                                             \
 169         MEM_KEEP(exit.data)                                             \
 170         STRUCT_ALIGN();                                                 \
 171         *(__tracepoints)                                                \
 172         /* implement dynamic printk debug */                            \
 173         . = ALIGN(8);                                                   \
 174         VMLINUX_SYMBOL(__start___verbose) = .;                          \
 175         *(__verbose)                                                    \
 176         VMLINUX_SYMBOL(__stop___verbose) = .;                           \
 177         LIKELY_PROFILE()                                                \
 178         BRANCH_PROFILE()                                                \
 179         TRACE_PRINTKS()
 180
 181 /*
 182  * Data section helpers
 183  */
 184 #define NOSAVE_DATA                                                     \
 185         . = ALIGN(PAGE_SIZE);                                           \
 186         VMLINUX_SYMBOL(__nosave_begin) = .;                             \
 187         *(.data..nosave)                                                \
 188         . = ALIGN(PAGE_SIZE);                                           \
 189         VMLINUX_SYMBOL(__nosave_end) = .;
 190
 191 #define PAGE_ALIGNED_DATA(page_align)                                   \
 192         . = ALIGN(page_align);                                          \
 193         *(.data..page_aligned)
 194
 195 #define READ_MOSTLY_DATA(align)                                         \
 196         . = ALIGN(align);                                               \
 197         *(.data..read_mostly)                                           \
 198         . = ALIGN(align);
 199
 200 #define CACHELINE_ALIGNED_DATA(align)                                   \
 201         . = ALIGN(align);                                               \
 202         *(.data..cacheline_aligned)
 203
 204 #define INIT_TASK_DATA(align)                                           \
 205         . = ALIGN(align);                                               \
 206         *(.data..init_task)
 207
 208 /*
 209  * Read only Data
 210  */
 211 #define RO_DATA_SECTION(align)                                          \
 212         . = ALIGN((align));                                             \
 213         .rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {           \
 214                 VMLINUX_SYMBOL(__start_rodata) = .;                     \
 215                 *(.rodata) *(.rodata.*)                                 \
 216                 *(__vermagic)           /* Kernel version magic */      \
 217                 . = ALIGN(8);                                           \
 218                 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .;         \
 219                 *(__tracepoints_ptrs)   /* Tracepoints: pointer array */\
 220                 VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .;          \
 221                 *(__markers_strings)    /* Markers: strings */          \
 222                 *(__tracepoints_strings)/* Tracepoints: strings */      \
 223         }                                                               \
 224                                                                         \
 225         .rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {          \
 226                 *(.rodata1)                                             \
 227         }                                                               \
 228                                                                         \
 229         BUG_TABLE                                                       \
 230                                                                         \
 231         JUMP_TABLE                                                      \
 232                                                                         \
 233         /* PCI quirks */                                                \
 234         .pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {        \
 235                 VMLINUX_SYMBOL(__start_pci_fixups_early) = .;           \
 236                 *(.pci_fixup_early)                                     \
 237                 VMLINUX_SYMBOL(__end_pci_fixups_early) = .;             \
 238                 VMLINUX_SYMBOL(__start_pci_fixups_header) = .;          \
 239                 *(.pci_fixup_header)                                    \
 240                 VMLINUX_SYMBOL(__end_pci_fixups_header) = .;            \
 241                 VMLINUX_SYMBOL(__start_pci_fixups_final) = .;           \
 242                 *(.pci_fixup_final)                                     \
 243                 VMLINUX_SYMBOL(__end_pci_fixups_final) = .;             \
 244                 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .;          \
 245                 *(.pci_fixup_enable)                                    \
 246                 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .;            \
 247                 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .;          \
 248                 *(.pci_fixup_resume)                                    \
 249                 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .;            \
 250                 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .;    \
 251                 *(.pci_fixup_resume_early)                              \
 252                 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .;      \
 253                 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .;         \
 254                 *(.pci_fixup_suspend)                                   \
 255                 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .;           \
 256         }                                                               \
 257                                                                         \
 258         /* Built-in firmware blobs */                                   \
 259         .builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {      \
 260                 VMLINUX_SYMBOL(__start_builtin_fw) = .;                 \
 261                 *(.builtin_fw)                                          \
 262                 VMLINUX_SYMBOL(__end_builtin_fw) = .;                   \
 263         }                                                               \
 264                                                                         \
 265         /* RapidIO route ops */                                         \
 266         .rio_ops        : AT(ADDR(.rio_ops) - LOAD_OFFSET) {            \
 267                 VMLINUX_SYMBOL(__start_rio_switch_ops) = .;             \
 268                 *(.rio_switch_ops)                                      \
 269                 VMLINUX_SYMBOL(__end_rio_switch_ops) = .;               \
 270         }                                                               \
 271                                                                         \
 272         TRACEDATA                                                       \
 273                                                                         \
 274         /* Kernel symbol table: Normal symbols */                       \
 275         __ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {         \
 276                 VMLINUX_SYMBOL(__start___ksymtab) = .;                  \
 277                 *(__ksymtab)                                            \
 278                 VMLINUX_SYMBOL(__stop___ksymtab) = .;                   \
 279         }                                                               \
 280                                                                         \
 281         /* Kernel symbol table: GPL-only symbols */                     \
 282         __ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {     \
 283                 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .;              \
 284                 *(__ksymtab_gpl)                                        \
 285                 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .;               \
 286         }                                                               \
 287                                                                         \
 288         /* Kernel symbol table: Normal unused symbols */                \
 289         __ksymtab_unused  : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) {  \
 290                 VMLINUX_SYMBOL(__start___ksymtab_unused) = .;           \
 291                 *(__ksymtab_unused)                                     \
 292                 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .;            \
 293         }                                                               \
 294                                                                         \
 295         /* Kernel symbol table: GPL-only unused symbols */              \
 296         __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
 297                 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .;       \
 298                 *(__ksymtab_unused_gpl)                                 \
 299                 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .;        \
 300         }                                                               \
 301                                                                         \
 302         /* Kernel symbol table: GPL-future-only symbols */              \
 303         __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
 304                 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .;       \
 305                 *(__ksymtab_gpl_future)                                 \
 306                 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .;        \
 307         }                                                               \
 308                                                                         \
 309         /* Kernel symbol table: Normal symbols */                       \
 310         __kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {         \
 311                 VMLINUX_SYMBOL(__start___kcrctab) = .;                  \
 312                 *(__kcrctab)                                            \
 313                 VMLINUX_SYMBOL(__stop___kcrctab) = .;                   \
 314         }                                                               \
 315                                                                         \
 316         /* Kernel symbol table: GPL-only symbols */                     \
 317         __kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {     \
 318                 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .;              \
 319                 *(__kcrctab_gpl)                                        \
 320                 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .;               \
 321         }                                                               \
 322                                                                         \
 323         /* Kernel symbol table: Normal unused symbols */                \
 324         __kcrctab_unused  : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) {  \
 325                 VMLINUX_SYMBOL(__start___kcrctab_unused) = .;           \
 326                 *(__kcrctab_unused)                                     \
 327                 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .;            \
 328         }                                                               \
 329                                                                         \
 330         /* Kernel symbol table: GPL-only unused symbols */              \
 331         __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
 332                 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .;       \
 333                 *(__kcrctab_unused_gpl)                                 \
 334                 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .;        \
 335         }                                                               \
 336                                                                         \
 337         /* Kernel symbol table: GPL-future-only symbols */              \
 338         __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
 339                 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .;       \
 340                 *(__kcrctab_gpl_future)                                 \
 341                 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .;        \
 342         }                                                               \
 343                                                                         \
 344         /* Kernel symbol table: strings */                              \
 345         __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
 346                 *(__ksymtab_strings)                                    \
 347         }                                                               \
 348                                                                         \
 349         /* __*init sections */                                          \
 350         __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {         \
 351                 *(.ref.rodata)                                          \
 352                 DEV_KEEP(init.rodata)                                   \
 353                 DEV_KEEP(exit.rodata)                                   \
 354                 CPU_KEEP(init.rodata)                                   \
 355                 CPU_KEEP(exit.rodata)                                   \
 356                 MEM_KEEP(init.rodata)                                   \
 357                 MEM_KEEP(exit.rodata)                                   \
 358         }                                                               \
 359                                                                         \
 360         /* Built-in module parameters. */                               \
 361         __param : AT(ADDR(__param) - LOAD_OFFSET) {                     \
 362                 VMLINUX_SYMBOL(__start___param) = .;                    \
 363                 *(__param)                                              \
 364                 VMLINUX_SYMBOL(__stop___param) = .;                     \
 365         }                                                               \
 366                                                                         \
 367         /* Built-in module versions. */                                 \
 368         __modver : AT(ADDR(__modver) - LOAD_OFFSET) {                   \
 369                 VMLINUX_SYMBOL(__start___modver) = .;                   \
 370                 *(__modver)                                             \
 371                 VMLINUX_SYMBOL(__stop___modver) = .;                    \
 372                 . = ALIGN((align));                                     \
 373                 VMLINUX_SYMBOL(__end_rodata) = .;                       \
 374         }                                                               \
 375         . = ALIGN((align));
 376
 377 /* RODATA & RO_DATA provided for backward compatibility.
 378  * All archs are supposed to use RO_DATA() */
 379 #define RODATA          RO_DATA_SECTION(4096)
 380 #define RO_DATA(align)  RO_DATA_SECTION(align)
 381
 382 #define SECURITY_INIT                                                   \
 383         .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
 384                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 385                 *(.security_initcall.init)                              \
 386                 VMLINUX_SYMBOL(__security_initcall_end) = .;            \
 387         }
 388
 389 /* .text section. Map to function alignment to avoid address changes
 390  * during second ld run in second ld pass when generating System.map */
 391 #define TEXT_TEXT                                                       \
 392                 ALIGN_FUNCTION();                                       \
 393                 *(.text.hot)                                            \
 394                 *(.text)                                                \
 395                 *(.ref.text)                                            \
 396         DEV_KEEP(init.text)                                             \
 397         DEV_KEEP(exit.text)                                             \
 398         CPU_KEEP(init.text)                                             \
 399         CPU_KEEP(exit.text)                                             \
 400         MEM_KEEP(init.text)                                             \
 401         MEM_KEEP(exit.text)                                             \
 402                 *(.text.unlikely)
 403
 404
 405 /* sched.text is aling to function alignment to secure we have same
 406  * address even at second ld pass when generating System.map */
 407 #define SCHED_TEXT                                                      \
 408                 ALIGN_FUNCTION();                                       \
 409                 VMLINUX_SYMBOL(__sched_text_start) = .;                 \
 410                 *(.sched.text)                                          \
 411                 VMLINUX_SYMBOL(__sched_text_end) = .;
 412
 413 /* spinlock.text is aling to function alignment to secure we have same
 414  * address even at second ld pass when generating System.map */
 415 #define LOCK_TEXT                                                       \
 416                 ALIGN_FUNCTION();                                       \
 417                 VMLINUX_SYMBOL(__lock_text_start) = .;                  \
 418                 *(.spinlock.text)                                       \
 419                 VMLINUX_SYMBOL(__lock_text_end) = .;
 420
 421 #define KPROBES_TEXT                                                    \
 422                 ALIGN_FUNCTION();                                       \
 423                 VMLINUX_SYMBOL(__kprobes_text_start) = .;               \
 424                 *(.kprobes.text)                                        \
 425                 VMLINUX_SYMBOL(__kprobes_text_end) = .;
 426
 427 #define ENTRY_TEXT                                                      \
 428                 ALIGN_FUNCTION();                                       \
 429                 VMLINUX_SYMBOL(__entry_text_start) = .;                 \
 430                 *(.entry.text)                                          \
 431                 VMLINUX_SYMBOL(__entry_text_end) = .;
 432
 433 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 434 #define IRQENTRY_TEXT                                                   \
 435                 ALIGN_FUNCTION();                                       \
 436                 VMLINUX_SYMBOL(__irqentry_text_start) = .;              \
 437                 *(.irqentry.text)                                       \
 438                 VMLINUX_SYMBOL(__irqentry_text_end) = .;
 439 #else
 440 #define IRQENTRY_TEXT
 441 #endif
 442
 443 /* Section used for early init (in .S files) */
 444 #define HEAD_TEXT  *(.head.text)
 445
 446 #define HEAD_TEXT_SECTION                                                       \
 447         .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {               \
 448                 HEAD_TEXT                                               \
 449         }
 450
 451 /*
 452  * Exception table
 453  */
 454 #define EXCEPTION_TABLE(align)                                          \
 455         . = ALIGN(align);                                               \
 456         __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {               \
 457                 VMLINUX_SYMBOL(__start___ex_table) = .;                 \
 458                 *(__ex_table)                                           \
 459                 VMLINUX_SYMBOL(__stop___ex_table) = .;                  \
 460         }
 461
 462 /*
 463  * Init task
 464  */
 465 #define INIT_TASK_DATA_SECTION(align)                                   \
 466         . = ALIGN(align);                                               \
 467         .data..init_task :  AT(ADDR(.data..init_task) - LOAD_OFFSET) {  \
 468                 INIT_TASK_DATA(align)                                   \
 469         }
 470
 471 #ifdef CONFIG_CONSTRUCTORS
 472 #define KERNEL_CTORS()  . = ALIGN(8);                      \
 473                         VMLINUX_SYMBOL(__ctors_start) = .; \
 474                         *(.ctors)                          \
 475                         VMLINUX_SYMBOL(__ctors_end) = .;
 476 #else
 477 #define KERNEL_CTORS()
 478 #endif
 479
 480 /* init and exit section handling */
 481 #define INIT_DATA                                                       \
 482         *(.init.data)                                                   \
 483         DEV_DISCARD(init.data)                                          \
 484         CPU_DISCARD(init.data)                                          \
 485         MEM_DISCARD(init.data)                                          \
 486         KERNEL_CTORS()                                                  \
 487         *(.init.rodata)                                                 \
 488         MCOUNT_REC()                                                    \
 489         FTRACE_EVENTS()                                                 \
 490         TRACE_SYSCALLS()                                                \
 491         DEV_DISCARD(init.rodata)                                        \
 492         CPU_DISCARD(init.rodata)                                        \
 493         MEM_DISCARD(init.rodata)                                        \
 494         KERNEL_DTB()
 495
 496 #define INIT_TEXT                                                       \
 497         *(.init.text)                                                   \
 498         DEV_DISCARD(init.text)                                          \
 499         CPU_DISCARD(init.text)                                          \
 500         MEM_DISCARD(init.text)
 501
 502 #define EXIT_DATA                                                       \
 503         *(.exit.data)                                                   \
 504         DEV_DISCARD(exit.data)                                          \
 505         DEV_DISCARD(exit.rodata)                                        \
 506         CPU_DISCARD(exit.data)                                          \
 507         CPU_DISCARD(exit.rodata)                                        \
 508         MEM_DISCARD(exit.data)                                          \
 509         MEM_DISCARD(exit.rodata)
 510
 511 #define EXIT_TEXT                                                       \
 512         *(.exit.text)                                                   \
 513         DEV_DISCARD(exit.text)                                          \
 514         CPU_DISCARD(exit.text)                                          \
 515         MEM_DISCARD(exit.text)
 516
 517 #define EXIT_CALL                                                       \
 518         *(.exitcall.exit)
 519
 520 /*
 521  * bss (Block Started by Symbol) - uninitialized data
 522  * zeroed during startup
 523  */
 524 #define SBSS(sbss_align)                                                \
 525         . = ALIGN(sbss_align);                                          \
 526         .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {                         \
 527                 *(.sbss)                                                \
 528                 *(.scommon)                                             \
 529         }
 530
 531 #define BSS(bss_align)                                                  \
 532         . = ALIGN(bss_align);                                           \
 533         .bss : AT(ADDR(.bss) - LOAD_OFFSET) {                           \
 534                 *(.bss..page_aligned)                                   \
 535                 *(.dynbss)                                              \
 536                 *(.bss)                                                 \
 537                 *(COMMON)                                               \
 538         }
 539
 540 /*
 541  * DWARF debug sections.
 542  * Symbols in the DWARF debugging sections are relative to
 543  * the beginning of the section so we begin them at 0.
 544  */
 545 #define DWARF_DEBUG                                                     \
 546                 /* DWARF 1 */                                           \
 547                 .debug          0 : { *(.debug) }                       \
 548                 .line           0 : { *(.line) }                        \
 549                 /* GNU DWARF 1 extensions */                            \
 550                 .debug_srcinfo  0 : { *(.debug_srcinfo) }               \
 551                 .debug_sfnames  0 : { *(.debug_sfnames) }               \
 552                 /* DWARF 1.1 and DWARF 2 */                             \
 553                 .debug_aranges  0 : { *(.debug_aranges) }               \
 554                 .debug_pubnames 0 : { *(.debug_pubnames) }              \
 555                 /* DWARF 2 */                                           \
 556                 .debug_info     0 : { *(.debug_info                     \
 557                                 .gnu.linkonce.wi.*) }                   \
 558                 .debug_abbrev   0 : { *(.debug_abbrev) }                \
 559                 .debug_line     0 : { *(.debug_line) }                  \
 560                 .debug_frame    0 : { *(.debug_frame) }                 \
 561                 .debug_str      0 : { *(.debug_str) }                   \
 562                 .debug_loc      0 : { *(.debug_loc) }                   \
 563                 .debug_macinfo  0 : { *(.debug_macinfo) }               \
 564                 /* SGI/MIPS DWARF 2 extensions */                       \
 565                 .debug_weaknames 0 : { *(.debug_weaknames) }            \
 566                 .debug_funcnames 0 : { *(.debug_funcnames) }            \
 567                 .debug_typenames 0 : { *(.debug_typenames) }            \
 568                 .debug_varnames  0 : { *(.debug_varnames) }             \
 569
 570                 /* Stabs debugging sections.  */
 571 #define STABS_DEBUG                                                     \
 572                 .stab 0 : { *(.stab) }                                  \
 573                 .stabstr 0 : { *(.stabstr) }                            \
 574                 .stab.excl 0 : { *(.stab.excl) }                        \
 575                 .stab.exclstr 0 : { *(.stab.exclstr) }                  \
 576                 .stab.index 0 : { *(.stab.index) }                      \
 577                 .stab.indexstr 0 : { *(.stab.indexstr) }                \
 578                 .comment 0 : { *(.comment) }
 579
 580 #ifdef CONFIG_GENERIC_BUG
 581 #define BUG_TABLE                                                       \
 582         . = ALIGN(8);                                                   \
 583         __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {             \
 584                 VMLINUX_SYMBOL(__start___bug_table) = .;                \
 585                 *(__bug_table)                                          \
 586                 VMLINUX_SYMBOL(__stop___bug_table) = .;                 \
 587         }
 588 #else
 589 #define BUG_TABLE
 590 #endif
 591
 592 #define JUMP_TABLE                                                      \
 593         . = ALIGN(8);                                                   \
 594         __jump_table : AT(ADDR(__jump_table) - LOAD_OFFSET) {           \
 595                 VMLINUX_SYMBOL(__start___jump_table) = .;               \
 596                 *(__jump_table)                                         \
 597                 VMLINUX_SYMBOL(__stop___jump_table) = .;                \
 598         }
 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 INITCALLS                                                       \
 626         *(.initcallearly.init)                                          \
 627         VMLINUX_SYMBOL(__early_initcall_end) = .;                       \
 628         *(.initcall0.init)                                              \
 629         *(.initcall0s.init)                                             \
 630         *(.initcall1.init)                                              \
 631         *(.initcall1s.init)                                             \
 632         *(.initcall2.init)                                              \
 633         *(.initcall2s.init)                                             \
 634         *(.initcall3.init)                                              \
 635         *(.initcall3s.init)                                             \
 636         *(.initcall4.init)                                              \
 637         *(.initcall4s.init)                                             \
 638         *(.initcall5.init)                                              \
 639         *(.initcall5s.init)                                             \
 640         *(.initcallrootfs.init)                                         \
 641         *(.initcall6.init)                                              \
 642         *(.initcall6s.init)                                             \
 643         *(.initcall7.init)                                              \
 644         *(.initcall7s.init)
 645
 646 #define INIT_CALLS                                                      \
 647                 VMLINUX_SYMBOL(__initcall_start) = .;                   \
 648                 INITCALLS                                               \
 649                 VMLINUX_SYMBOL(__initcall_end) = .;
 650
 651 #define CON_INITCALL                                                    \
 652                 VMLINUX_SYMBOL(__con_initcall_start) = .;               \
 653                 *(.con_initcall.init)                                   \
 654                 VMLINUX_SYMBOL(__con_initcall_end) = .;
 655
 656 #define SECURITY_INITCALL                                               \
 657                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 658                 *(.security_initcall.init)                              \
 659                 VMLINUX_SYMBOL(__security_initcall_end) = .;
 660
 661 #ifdef CONFIG_BLK_DEV_INITRD
 662 #define INIT_RAM_FS                                                     \
 663         . = ALIGN(4);                                                   \
 664         VMLINUX_SYMBOL(__initramfs_start) = .;                          \
 665         *(.init.ramfs)                                                  \
 666         . = ALIGN(8);                                                   \
 667         *(.init.ramfs.info)
 668 #else
 669 #define INIT_RAM_FS
 670 #endif
 671
 672 /*
 673  * Default discarded sections.
 674  *
 675  * Some archs want to discard exit text/data at runtime rather than
 676  * link time due to cross-section references such as alt instructions,
 677  * bug table, eh_frame, etc.  DISCARDS must be the last of output
 678  * section definitions so that such archs put those in earlier section
 679  * definitions.
 680  */
 681 #define DISCARDS                                                        \
 682         /DISCARD/ : {                                                   \
 683         EXIT_TEXT                                                       \
 684         EXIT_DATA                                                       \
 685         EXIT_CALL                                                       \
 686         *(.discard)                                                     \
 687         *(.discard.*)                                                   \
 688         }
 689
 690 /**
 691  * PERCPU_INPUT - the percpu input sections
 692  * @cacheline: cacheline size
 693  *
 694  * The core percpu section names and core symbols which do not rely
 695  * directly upon load addresses.
 696  *
 697  * @cacheline is used to align subsections to avoid false cacheline
 698  * sharing between subsections for different purposes.
 699  */
 700 #define PERCPU_INPUT(cacheline)                                         \
 701         VMLINUX_SYMBOL(__per_cpu_start) = .;                            \
 702         *(.data..percpu..first)                                         \
 703         . = ALIGN(PAGE_SIZE);                                           \
 704         *(.data..percpu..page_aligned)                                  \
 705         . = ALIGN(cacheline);                                           \
 706         *(.data..percpu..readmostly)                                    \
 707         . = ALIGN(cacheline);                                           \
 708         *(.data..percpu)                                                \
 709         *(.data..percpu..shared_aligned)                                \
 710         VMLINUX_SYMBOL(__per_cpu_end) = .;
 711
 712 /**
 713  * PERCPU_VADDR - define output section for percpu area
 714  * @cacheline: cacheline size
 715  * @vaddr: explicit base address (optional)
 716  * @phdr: destination PHDR (optional)
 717  *
 718  * Macro which expands to output section for percpu area.
 719  *
 720  * @cacheline is used to align subsections to avoid false cacheline
 721  * sharing between subsections for different purposes.
 722  *
 723  * If @vaddr is not blank, it specifies explicit base address and all
 724  * percpu symbols will be offset from the given address.  If blank,
 725  * @vaddr always equals @laddr + LOAD_OFFSET.
 726  *
 727  * @phdr defines the output PHDR to use if not blank.  Be warned that
 728  * output PHDR is sticky.  If @phdr is specified, the next output
 729  * section in the linker script will go there too.  @phdr should have
 730  * a leading colon.
 731  *
 732  * Note that this macros defines __per_cpu_load as an absolute symbol.
 733  * If there is no need to put the percpu section at a predetermined
 734  * address, use PERCPU_SECTION.
 735  */
 736 #define PERCPU_VADDR(cacheline, vaddr, phdr)                            \
 737         VMLINUX_SYMBOL(__per_cpu_load) = .;                             \
 738         .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load)         \
 739                                 - LOAD_OFFSET) {                        \
 740                 PERCPU_INPUT(cacheline)                                 \
 741         } phdr                                                          \
 742         . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
 743
 744 /**
 745  * PERCPU_SECTION - define output section for percpu area, simple version
 746  * @cacheline: cacheline size
 747  *
 748  * Align to PAGE_SIZE and outputs output section for percpu area.  This
 749  * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
 750  * __per_cpu_start will be identical.
 751  *
 752  * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
 753  * except that __per_cpu_load is defined as a relative symbol against
 754  * .data..percpu which is required for relocatable x86_32 configuration.
 755  */
 756 #define PERCPU_SECTION(cacheline)                                       \
 757         . = ALIGN(PAGE_SIZE);                                           \
 758         .data..percpu   : AT(ADDR(.data..percpu) - LOAD_OFFSET) {       \
 759                 VMLINUX_SYMBOL(__per_cpu_load) = .;                     \
 760                 PERCPU_INPUT(cacheline)                                 \
 761         }
 762
 763
 764 /*
 765  * Definition of the high level *_SECTION macros
 766  * They will fit only a subset of the architectures
 767  */
 768
 769
 770 /*
 771  * Writeable data.
 772  * All sections are combined in a single .data section.
 773  * The sections following CONSTRUCTORS are arranged so their
 774  * typical alignment matches.
 775  * A cacheline is typical/always less than a PAGE_SIZE so
 776  * the sections that has this restriction (or similar)
 777  * is located before the ones requiring PAGE_SIZE alignment.
 778  * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
 779  * matches the requirment of PAGE_ALIGNED_DATA.
 780  *
 781  * use 0 as page_align if page_aligned data is not used */
 782 #define RW_DATA_SECTION(cacheline, pagealigned, inittask)               \
 783         . = ALIGN(PAGE_SIZE);                                           \
 784         .data : AT(ADDR(.data) - LOAD_OFFSET) {                         \
 785                 INIT_TASK_DATA(inittask)                                \
 786                 NOSAVE_DATA                                             \
 787                 PAGE_ALIGNED_DATA(pagealigned)                          \
 788                 CACHELINE_ALIGNED_DATA(cacheline)                       \
 789                 READ_MOSTLY_DATA(cacheline)                             \
 790                 DATA_DATA                                               \
 791                 CONSTRUCTORS                                            \
 792         }
 793
 794 #define INIT_TEXT_SECTION(inittext_align)                               \
 795         . = ALIGN(inittext_align);                                      \
 796         .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {               \
 797                 VMLINUX_SYMBOL(_sinittext) = .;                         \
 798                 INIT_TEXT                                               \
 799                 VMLINUX_SYMBOL(_einittext) = .;                         \
 800         }
 801
 802 #define INIT_DATA_SECTION(initsetup_align)                              \
 803         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {               \
 804                 INIT_DATA                                               \
 805                 INIT_SETUP(initsetup_align)                             \
 806                 INIT_CALLS                                              \
 807                 CON_INITCALL                                            \
 808                 SECURITY_INITCALL                                       \
 809                 INIT_RAM_FS                                             \
 810         }
 811
 812 #define BSS_SECTION(sbss_align, bss_align, stop_align)                  \
 813         . = ALIGN(sbss_align);                                          \
 814         VMLINUX_SYMBOL(__bss_start) = .;                                \
 815         SBSS(sbss_align)                                                \
 816         BSS(bss_align)                                                  \
 817         . = ALIGN(stop_align);                                          \
 818         VMLINUX_SYMBOL(__bss_stop) = .;