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(PAGE_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() VMLINUX_SYMBOL(__start_ftrace_events) = .;      \
 128                         *(_ftrace_events)                               \
 129                         VMLINUX_SYMBOL(__stop_ftrace_events) = .;
 130 #else
 131 #define FTRACE_EVENTS()
 132 #endif
 133
 134 #ifdef CONFIG_TRACING
 135 #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .;      \
 136                          *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \
 137                          VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;
 138 #else
 139 #define TRACE_PRINTKS()
 140 #endif
 141
 142 #ifdef CONFIG_FTRACE_SYSCALLS
 143 #define TRACE_SYSCALLS() VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \
 144                          *(__syscalls_metadata)                         \
 145                          VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
 146 #else
 147 #define TRACE_SYSCALLS()
 148 #endif
 149
 150
 151 #define KERNEL_DTB()                                                    \
 152         STRUCT_ALIGN();                                                 \
 153         VMLINUX_SYMBOL(__dtb_start) = .;                                \
 154         *(.dtb.init.rodata)                                             \
 155         VMLINUX_SYMBOL(__dtb_end) = .;
 156
 157 /* .data section */
 158 #define DATA_DATA                                                       \
 159         *(.data)                                                        \
 160         *(.ref.data)                                                    \
 161         *(.data..shared_aligned) /* percpu related */                   \
 162         DEV_KEEP(init.data)                                             \
 163         DEV_KEEP(exit.data)                                             \
 164         CPU_KEEP(init.data)                                             \
 165         CPU_KEEP(exit.data)                                             \
 166         MEM_KEEP(init.data)                                             \
 167         MEM_KEEP(exit.data)                                             \
 168         . = ALIGN(32);                                                  \
 169         VMLINUX_SYMBOL(__start___tracepoints) = .;                      \
 170         *(__tracepoints)                                                \
 171         VMLINUX_SYMBOL(__stop___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         STRUCT_ALIGN();                                                 \
 182         FTRACE_EVENTS()                                                 \
 183                                                                         \
 184         STRUCT_ALIGN();                                                 \
 185         TRACE_SYSCALLS()
 186
 187 /*
 188  * Data section helpers
 189  */
 190 #define NOSAVE_DATA                                                     \
 191         . = ALIGN(PAGE_SIZE);                                           \
 192         VMLINUX_SYMBOL(__nosave_begin) = .;                             \
 193         *(.data..nosave)                                                \
 194         . = ALIGN(PAGE_SIZE);                                           \
 195         VMLINUX_SYMBOL(__nosave_end) = .;
 196
 197 #define PAGE_ALIGNED_DATA(page_align)                                   \
 198         . = ALIGN(page_align);                                          \
 199         *(.data..page_aligned)
 200
 201 #define READ_MOSTLY_DATA(align)                                         \
 202         . = ALIGN(align);                                               \
 203         *(.data..read_mostly)                                           \
 204         . = ALIGN(align);
 205
 206 #define CACHELINE_ALIGNED_DATA(align)                                   \
 207         . = ALIGN(align);                                               \
 208         *(.data..cacheline_aligned)
 209
 210 #define INIT_TASK_DATA(align)                                           \
 211         . = ALIGN(align);                                               \
 212         *(.data..init_task)
 213
 214 /*
 215  * Read only Data
 216  */
 217 #define RO_DATA_SECTION(align)                                          \
 218         . = ALIGN((align));                                             \
 219         .rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {           \
 220                 VMLINUX_SYMBOL(__start_rodata) = .;                     \
 221                 *(.rodata) *(.rodata.*)                                 \
 222                 *(__vermagic)           /* Kernel version magic */      \
 223                 *(__markers_strings)    /* Markers: strings */          \
 224                 *(__tracepoints_strings)/* Tracepoints: strings */      \
 225         }                                                               \
 226                                                                         \
 227         .rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {          \
 228                 *(.rodata1)                                             \
 229         }                                                               \
 230                                                                         \
 231         BUG_TABLE                                                       \
 232                                                                         \
 233         JUMP_TABLE                                                      \
 234                                                                         \
 235         /* PCI quirks */                                                \
 236         .pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {        \
 237                 VMLINUX_SYMBOL(__start_pci_fixups_early) = .;           \
 238                 *(.pci_fixup_early)                                     \
 239                 VMLINUX_SYMBOL(__end_pci_fixups_early) = .;             \
 240                 VMLINUX_SYMBOL(__start_pci_fixups_header) = .;          \
 241                 *(.pci_fixup_header)                                    \
 242                 VMLINUX_SYMBOL(__end_pci_fixups_header) = .;            \
 243                 VMLINUX_SYMBOL(__start_pci_fixups_final) = .;           \
 244                 *(.pci_fixup_final)                                     \
 245                 VMLINUX_SYMBOL(__end_pci_fixups_final) = .;             \
 246                 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .;          \
 247                 *(.pci_fixup_enable)                                    \
 248                 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .;            \
 249                 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .;          \
 250                 *(.pci_fixup_resume)                                    \
 251                 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .;            \
 252                 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .;    \
 253                 *(.pci_fixup_resume_early)                              \
 254                 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .;      \
 255                 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .;         \
 256                 *(.pci_fixup_suspend)                                   \
 257                 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .;           \
 258         }                                                               \
 259                                                                         \
 260         /* Built-in firmware blobs */                                   \
 261         .builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {      \
 262                 VMLINUX_SYMBOL(__start_builtin_fw) = .;                 \
 263                 *(.builtin_fw)                                          \
 264                 VMLINUX_SYMBOL(__end_builtin_fw) = .;                   \
 265         }                                                               \
 266                                                                         \
 267         /* RapidIO route ops */                                         \
 268         .rio_ops        : AT(ADDR(.rio_ops) - LOAD_OFFSET) {            \
 269                 VMLINUX_SYMBOL(__start_rio_switch_ops) = .;             \
 270                 *(.rio_switch_ops)                                      \
 271                 VMLINUX_SYMBOL(__end_rio_switch_ops) = .;               \
 272         }                                                               \
 273                                                                         \
 274         TRACEDATA                                                       \
 275                                                                         \
 276         /* Kernel symbol table: Normal symbols */                       \
 277         __ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {         \
 278                 VMLINUX_SYMBOL(__start___ksymtab) = .;                  \
 279                 *(__ksymtab)                                            \
 280                 VMLINUX_SYMBOL(__stop___ksymtab) = .;                   \
 281         }                                                               \
 282                                                                         \
 283         /* Kernel symbol table: GPL-only symbols */                     \
 284         __ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {     \
 285                 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .;              \
 286                 *(__ksymtab_gpl)                                        \
 287                 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .;               \
 288         }                                                               \
 289                                                                         \
 290         /* Kernel symbol table: Normal unused symbols */                \
 291         __ksymtab_unused  : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) {  \
 292                 VMLINUX_SYMBOL(__start___ksymtab_unused) = .;           \
 293                 *(__ksymtab_unused)                                     \
 294                 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .;            \
 295         }                                                               \
 296                                                                         \
 297         /* Kernel symbol table: GPL-only unused symbols */              \
 298         __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
 299                 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .;       \
 300                 *(__ksymtab_unused_gpl)                                 \
 301                 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .;        \
 302         }                                                               \
 303                                                                         \
 304         /* Kernel symbol table: GPL-future-only symbols */              \
 305         __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
 306                 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .;       \
 307                 *(__ksymtab_gpl_future)                                 \
 308                 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .;        \
 309         }                                                               \
 310                                                                         \
 311         /* Kernel symbol table: Normal symbols */                       \
 312         __kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {         \
 313                 VMLINUX_SYMBOL(__start___kcrctab) = .;                  \
 314                 *(__kcrctab)                                            \
 315                 VMLINUX_SYMBOL(__stop___kcrctab) = .;                   \
 316         }                                                               \
 317                                                                         \
 318         /* Kernel symbol table: GPL-only symbols */                     \
 319         __kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {     \
 320                 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .;              \
 321                 *(__kcrctab_gpl)                                        \
 322                 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .;               \
 323         }                                                               \
 324                                                                         \
 325         /* Kernel symbol table: Normal unused symbols */                \
 326         __kcrctab_unused  : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) {  \
 327                 VMLINUX_SYMBOL(__start___kcrctab_unused) = .;           \
 328                 *(__kcrctab_unused)                                     \
 329                 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .;            \
 330         }                                                               \
 331                                                                         \
 332         /* Kernel symbol table: GPL-only unused symbols */              \
 333         __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
 334                 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .;       \
 335                 *(__kcrctab_unused_gpl)                                 \
 336                 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .;        \
 337         }                                                               \
 338                                                                         \
 339         /* Kernel symbol table: GPL-future-only symbols */              \
 340         __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
 341                 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .;       \
 342                 *(__kcrctab_gpl_future)                                 \
 343                 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .;        \
 344         }                                                               \
 345                                                                         \
 346         /* Kernel symbol table: strings */                              \
 347         __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
 348                 *(__ksymtab_strings)                                    \
 349         }                                                               \
 350                                                                         \
 351         /* __*init sections */                                          \
 352         __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {         \
 353                 *(.ref.rodata)                                          \
 354                 DEV_KEEP(init.rodata)                                   \
 355                 DEV_KEEP(exit.rodata)                                   \
 356                 CPU_KEEP(init.rodata)                                   \
 357                 CPU_KEEP(exit.rodata)                                   \
 358                 MEM_KEEP(init.rodata)                                   \
 359                 MEM_KEEP(exit.rodata)                                   \
 360         }                                                               \
 361                                                                         \
 362         /* Built-in module parameters. */                               \
 363         __param : AT(ADDR(__param) - LOAD_OFFSET) {                     \
 364                 VMLINUX_SYMBOL(__start___param) = .;                    \
 365                 *(__param)                                              \
 366                 VMLINUX_SYMBOL(__stop___param) = .;                     \
 367                 . = ALIGN((align));                                     \
 368                 VMLINUX_SYMBOL(__end_rodata) = .;                       \
 369         }                                                               \
 370         . = ALIGN((align));
 371
 372 /* RODATA & RO_DATA provided for backward compatibility.
 373  * All archs are supposed to use RO_DATA() */
 374 #define RODATA          RO_DATA_SECTION(4096)
 375 #define RO_DATA(align)  RO_DATA_SECTION(align)
 376
 377 #define SECURITY_INIT                                                   \
 378         .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
 379                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 380                 *(.security_initcall.init)                              \
 381                 VMLINUX_SYMBOL(__security_initcall_end) = .;            \
 382         }
 383
 384 /* .text section. Map to function alignment to avoid address changes
 385  * during second ld run in second ld pass when generating System.map */
 386 #define TEXT_TEXT                                                       \
 387                 ALIGN_FUNCTION();                                       \
 388                 *(.text.hot)                                            \
 389                 *(.text)                                                \
 390                 *(.ref.text)                                            \
 391         DEV_KEEP(init.text)                                             \
 392         DEV_KEEP(exit.text)                                             \
 393         CPU_KEEP(init.text)                                             \
 394         CPU_KEEP(exit.text)                                             \
 395         MEM_KEEP(init.text)                                             \
 396         MEM_KEEP(exit.text)                                             \
 397                 *(.text.unlikely)
 398
 399
 400 /* sched.text is aling to function alignment to secure we have same
 401  * address even at second ld pass when generating System.map */
 402 #define SCHED_TEXT                                                      \
 403                 ALIGN_FUNCTION();                                       \
 404                 VMLINUX_SYMBOL(__sched_text_start) = .;                 \
 405                 *(.sched.text)                                          \
 406                 VMLINUX_SYMBOL(__sched_text_end) = .;
 407
 408 /* spinlock.text is aling to function alignment to secure we have same
 409  * address even at second ld pass when generating System.map */
 410 #define LOCK_TEXT                                                       \
 411                 ALIGN_FUNCTION();                                       \
 412                 VMLINUX_SYMBOL(__lock_text_start) = .;                  \
 413                 *(.spinlock.text)                                       \
 414                 VMLINUX_SYMBOL(__lock_text_end) = .;
 415
 416 #define KPROBES_TEXT                                                    \
 417                 ALIGN_FUNCTION();                                       \
 418                 VMLINUX_SYMBOL(__kprobes_text_start) = .;               \
 419                 *(.kprobes.text)                                        \
 420                 VMLINUX_SYMBOL(__kprobes_text_end) = .;
 421
 422 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 423 #define IRQENTRY_TEXT                                                   \
 424                 ALIGN_FUNCTION();                                       \
 425                 VMLINUX_SYMBOL(__irqentry_text_start) = .;              \
 426                 *(.irqentry.text)                                       \
 427                 VMLINUX_SYMBOL(__irqentry_text_end) = .;
 428 #else
 429 #define IRQENTRY_TEXT
 430 #endif
 431
 432 /* Section used for early init (in .S files) */
 433 #define HEAD_TEXT  *(.head.text)
 434
 435 #define HEAD_TEXT_SECTION                                                       \
 436         .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {               \
 437                 HEAD_TEXT                                               \
 438         }
 439
 440 /*
 441  * Exception table
 442  */
 443 #define EXCEPTION_TABLE(align)                                          \
 444         . = ALIGN(align);                                               \
 445         __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {               \
 446                 VMLINUX_SYMBOL(__start___ex_table) = .;                 \
 447                 *(__ex_table)                                           \
 448                 VMLINUX_SYMBOL(__stop___ex_table) = .;                  \
 449         }
 450
 451 /*
 452  * Init task
 453  */
 454 #define INIT_TASK_DATA_SECTION(align)                                   \
 455         . = ALIGN(align);                                               \
 456         .data..init_task :  AT(ADDR(.data..init_task) - LOAD_OFFSET) {  \
 457                 INIT_TASK_DATA(align)                                   \
 458         }
 459
 460 #ifdef CONFIG_CONSTRUCTORS
 461 #define KERNEL_CTORS()  . = ALIGN(8);                      \
 462                         VMLINUX_SYMBOL(__ctors_start) = .; \
 463                         *(.ctors)                          \
 464                         VMLINUX_SYMBOL(__ctors_end) = .;
 465 #else
 466 #define KERNEL_CTORS()
 467 #endif
 468
 469 /* init and exit section handling */
 470 #define INIT_DATA                                                       \
 471         *(.init.data)                                                   \
 472         DEV_DISCARD(init.data)                                          \
 473         CPU_DISCARD(init.data)                                          \
 474         MEM_DISCARD(init.data)                                          \
 475         KERNEL_CTORS()                                                  \
 476         *(.init.rodata)                                                 \
 477         MCOUNT_REC()                                                    \
 478         DEV_DISCARD(init.rodata)                                        \
 479         CPU_DISCARD(init.rodata)                                        \
 480         MEM_DISCARD(init.rodata)                                        \
 481         KERNEL_DTB()
 482
 483 #define INIT_TEXT                                                       \
 484         *(.init.text)                                                   \
 485         DEV_DISCARD(init.text)                                          \
 486         CPU_DISCARD(init.text)                                          \
 487         MEM_DISCARD(init.text)
 488
 489 #define EXIT_DATA                                                       \
 490         *(.exit.data)                                                   \
 491         DEV_DISCARD(exit.data)                                          \
 492         DEV_DISCARD(exit.rodata)                                        \
 493         CPU_DISCARD(exit.data)                                          \
 494         CPU_DISCARD(exit.rodata)                                        \
 495         MEM_DISCARD(exit.data)                                          \
 496         MEM_DISCARD(exit.rodata)
 497
 498 #define EXIT_TEXT                                                       \
 499         *(.exit.text)                                                   \
 500         DEV_DISCARD(exit.text)                                          \
 501         CPU_DISCARD(exit.text)                                          \
 502         MEM_DISCARD(exit.text)
 503
 504 #define EXIT_CALL                                                       \
 505         *(.exitcall.exit)
 506
 507 /*
 508  * bss (Block Started by Symbol) - uninitialized data
 509  * zeroed during startup
 510  */
 511 #define SBSS(sbss_align)                                                \
 512         . = ALIGN(sbss_align);                                          \
 513         .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {                         \
 514                 *(.sbss)                                                \
 515                 *(.scommon)                                             \
 516         }
 517
 518 #define BSS(bss_align)                                                  \
 519         . = ALIGN(bss_align);                                           \
 520         .bss : AT(ADDR(.bss) - LOAD_OFFSET) {                           \
 521                 *(.bss..page_aligned)                                   \
 522                 *(.dynbss)                                              \
 523                 *(.bss)                                                 \
 524                 *(COMMON)                                               \
 525         }
 526
 527 /*
 528  * DWARF debug sections.
 529  * Symbols in the DWARF debugging sections are relative to
 530  * the beginning of the section so we begin them at 0.
 531  */
 532 #define DWARF_DEBUG                                                     \
 533                 /* DWARF 1 */                                           \
 534                 .debug          0 : { *(.debug) }                       \
 535                 .line           0 : { *(.line) }                        \
 536                 /* GNU DWARF 1 extensions */                            \
 537                 .debug_srcinfo  0 : { *(.debug_srcinfo) }               \
 538                 .debug_sfnames  0 : { *(.debug_sfnames) }               \
 539                 /* DWARF 1.1 and DWARF 2 */                             \
 540                 .debug_aranges  0 : { *(.debug_aranges) }               \
 541                 .debug_pubnames 0 : { *(.debug_pubnames) }              \
 542                 /* DWARF 2 */                                           \
 543                 .debug_info     0 : { *(.debug_info                     \
 544                                 .gnu.linkonce.wi.*) }                   \
 545                 .debug_abbrev   0 : { *(.debug_abbrev) }                \
 546                 .debug_line     0 : { *(.debug_line) }                  \
 547                 .debug_frame    0 : { *(.debug_frame) }                 \
 548                 .debug_str      0 : { *(.debug_str) }                   \
 549                 .debug_loc      0 : { *(.debug_loc) }                   \
 550                 .debug_macinfo  0 : { *(.debug_macinfo) }               \
 551                 /* SGI/MIPS DWARF 2 extensions */                       \
 552                 .debug_weaknames 0 : { *(.debug_weaknames) }            \
 553                 .debug_funcnames 0 : { *(.debug_funcnames) }            \
 554                 .debug_typenames 0 : { *(.debug_typenames) }            \
 555                 .debug_varnames  0 : { *(.debug_varnames) }             \
 556
 557                 /* Stabs debugging sections.  */
 558 #define STABS_DEBUG                                                     \
 559                 .stab 0 : { *(.stab) }                                  \
 560                 .stabstr 0 : { *(.stabstr) }                            \
 561                 .stab.excl 0 : { *(.stab.excl) }                        \
 562                 .stab.exclstr 0 : { *(.stab.exclstr) }                  \
 563                 .stab.index 0 : { *(.stab.index) }                      \
 564                 .stab.indexstr 0 : { *(.stab.indexstr) }                \
 565                 .comment 0 : { *(.comment) }
 566
 567 #ifdef CONFIG_GENERIC_BUG
 568 #define BUG_TABLE                                                       \
 569         . = ALIGN(8);                                                   \
 570         __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {             \
 571                 VMLINUX_SYMBOL(__start___bug_table) = .;                \
 572                 *(__bug_table)                                          \
 573                 VMLINUX_SYMBOL(__stop___bug_table) = .;                 \
 574         }
 575 #else
 576 #define BUG_TABLE
 577 #endif
 578
 579 #define JUMP_TABLE                                                      \
 580         . = ALIGN(8);                                                   \
 581         __jump_table : AT(ADDR(__jump_table) - LOAD_OFFSET) {           \
 582                 VMLINUX_SYMBOL(__start___jump_table) = .;               \
 583                 *(__jump_table)                                         \
 584                 VMLINUX_SYMBOL(__stop___jump_table) = .;                \
 585         }
 586
 587 #ifdef CONFIG_PM_TRACE
 588 #define TRACEDATA                                                       \
 589         . = ALIGN(4);                                                   \
 590         .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {               \
 591                 VMLINUX_SYMBOL(__tracedata_start) = .;                  \
 592                 *(.tracedata)                                           \
 593                 VMLINUX_SYMBOL(__tracedata_end) = .;                    \
 594         }
 595 #else
 596 #define TRACEDATA
 597 #endif
 598
 599 #define NOTES                                                           \
 600         .notes : AT(ADDR(.notes) - LOAD_OFFSET) {                       \
 601                 VMLINUX_SYMBOL(__start_notes) = .;                      \
 602                 *(.note.*)                                              \
 603                 VMLINUX_SYMBOL(__stop_notes) = .;                       \
 604         }
 605
 606 #define INIT_SETUP(initsetup_align)                                     \
 607                 . = ALIGN(initsetup_align);                             \
 608                 VMLINUX_SYMBOL(__setup_start) = .;                      \
 609                 *(.init.setup)                                          \
 610                 VMLINUX_SYMBOL(__setup_end) = .;
 611
 612 #define INITCALLS                                                       \
 613         *(.initcallearly.init)                                          \
 614         VMLINUX_SYMBOL(__early_initcall_end) = .;                       \
 615         *(.initcall0.init)                                              \
 616         *(.initcall0s.init)                                             \
 617         *(.initcall1.init)                                              \
 618         *(.initcall1s.init)                                             \
 619         *(.initcall2.init)                                              \
 620         *(.initcall2s.init)                                             \
 621         *(.initcall3.init)                                              \
 622         *(.initcall3s.init)                                             \
 623         *(.initcall4.init)                                              \
 624         *(.initcall4s.init)                                             \
 625         *(.initcall5.init)                                              \
 626         *(.initcall5s.init)                                             \
 627         *(.initcallrootfs.init)                                         \
 628         *(.initcall6.init)                                              \
 629         *(.initcall6s.init)                                             \
 630         *(.initcall7.init)                                              \
 631         *(.initcall7s.init)
 632
 633 #define INIT_CALLS                                                      \
 634                 VMLINUX_SYMBOL(__initcall_start) = .;                   \
 635                 INITCALLS                                               \
 636                 VMLINUX_SYMBOL(__initcall_end) = .;
 637
 638 #define CON_INITCALL                                                    \
 639                 VMLINUX_SYMBOL(__con_initcall_start) = .;               \
 640                 *(.con_initcall.init)                                   \
 641                 VMLINUX_SYMBOL(__con_initcall_end) = .;
 642
 643 #define SECURITY_INITCALL                                               \
 644                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 645                 *(.security_initcall.init)                              \
 646                 VMLINUX_SYMBOL(__security_initcall_end) = .;
 647
 648 #ifdef CONFIG_BLK_DEV_INITRD
 649 #define INIT_RAM_FS                                                     \
 650         . = ALIGN(4);                                                   \
 651         VMLINUX_SYMBOL(__initramfs_start) = .;                          \
 652         *(.init.ramfs)                                                  \
 653         . = ALIGN(8);                                                   \
 654         *(.init.ramfs.info)
 655 #else
 656 #define INIT_RAM_FS
 657 #endif
 658
 659 /*
 660  * Default discarded sections.
 661  *
 662  * Some archs want to discard exit text/data at runtime rather than
 663  * link time due to cross-section references such as alt instructions,
 664  * bug table, eh_frame, etc.  DISCARDS must be the last of output
 665  * section definitions so that such archs put those in earlier section
 666  * definitions.
 667  */
 668 #define DISCARDS                                                        \
 669         /DISCARD/ : {                                                   \
 670         EXIT_TEXT                                                       \
 671         EXIT_DATA                                                       \
 672         EXIT_CALL                                                       \
 673         *(.discard)                                                     \
 674         *(.discard.*)                                                   \
 675         }
 676
 677 /**
 678  * PERCPU_VADDR - define output section for percpu area
 679  * @vaddr: explicit base address (optional)
 680  * @phdr: destination PHDR (optional)
 681  *
 682  * Macro which expands to output section for percpu area.  If @vaddr
 683  * is not blank, it specifies explicit base address and all percpu
 684  * symbols will be offset from the given address.  If blank, @vaddr
 685  * always equals @laddr + LOAD_OFFSET.
 686  *
 687  * @phdr defines the output PHDR to use if not blank.  Be warned that
 688  * output PHDR is sticky.  If @phdr is specified, the next output
 689  * section in the linker script will go there too.  @phdr should have
 690  * a leading colon.
 691  *
 692  * Note that this macros defines __per_cpu_load as an absolute symbol.
 693  * If there is no need to put the percpu section at a predetermined
 694  * address, use PERCPU().
 695  */
 696 #define PERCPU_VADDR(vaddr, phdr)                                       \
 697         VMLINUX_SYMBOL(__per_cpu_load) = .;                             \
 698         .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load)         \
 699                                 - LOAD_OFFSET) {                        \
 700                 VMLINUX_SYMBOL(__per_cpu_start) = .;                    \
 701                 *(.data..percpu..first)                                 \
 702                 . = ALIGN(PAGE_SIZE);                                   \
 703                 *(.data..percpu..page_aligned)                          \
 704                 *(.data..percpu..readmostly)                            \
 705                 *(.data..percpu)                                        \
 706                 *(.data..percpu..shared_aligned)                        \
 707                 VMLINUX_SYMBOL(__per_cpu_end) = .;                      \
 708         } phdr                                                          \
 709         . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
 710
 711 /**
 712  * PERCPU - define output section for percpu area, simple version
 713  * @align: required alignment
 714  *
 715  * Align to @align and outputs output section for percpu area.  This
 716  * macro doesn't maniuplate @vaddr or @phdr and __per_cpu_load and
 717  * __per_cpu_start will be identical.
 718  *
 719  * This macro is equivalent to ALIGN(align); PERCPU_VADDR( , ) except
 720  * that __per_cpu_load is defined as a relative symbol against
 721  * .data..percpu which is required for relocatable x86_32
 722  * configuration.
 723  */
 724 #define PERCPU(align)                                                   \
 725         . = ALIGN(align);                                               \
 726         .data..percpu   : AT(ADDR(.data..percpu) - LOAD_OFFSET) {       \
 727                 VMLINUX_SYMBOL(__per_cpu_load) = .;                     \
 728                 VMLINUX_SYMBOL(__per_cpu_start) = .;                    \
 729                 *(.data..percpu..first)                                 \
 730                 . = ALIGN(PAGE_SIZE);                                   \
 731                 *(.data..percpu..page_aligned)                          \
 732                 *(.data..percpu..readmostly)                            \
 733                 *(.data..percpu)                                        \
 734                 *(.data..percpu..shared_aligned)                        \
 735                 VMLINUX_SYMBOL(__per_cpu_end) = .;                      \
 736         }
 737
 738
 739 /*
 740  * Definition of the high level *_SECTION macros
 741  * They will fit only a subset of the architectures
 742  */
 743
 744
 745 /*
 746  * Writeable data.
 747  * All sections are combined in a single .data section.
 748  * The sections following CONSTRUCTORS are arranged so their
 749  * typical alignment matches.
 750  * A cacheline is typical/always less than a PAGE_SIZE so
 751  * the sections that has this restriction (or similar)
 752  * is located before the ones requiring PAGE_SIZE alignment.
 753  * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
 754  * matches the requirment of PAGE_ALIGNED_DATA.
 755  *
 756  * use 0 as page_align if page_aligned data is not used */
 757 #define RW_DATA_SECTION(cacheline, pagealigned, inittask)               \
 758         . = ALIGN(PAGE_SIZE);                                           \
 759         .data : AT(ADDR(.data) - LOAD_OFFSET) {                         \
 760                 INIT_TASK_DATA(inittask)                                \
 761                 NOSAVE_DATA                                             \
 762                 PAGE_ALIGNED_DATA(pagealigned)                          \
 763                 CACHELINE_ALIGNED_DATA(cacheline)                       \
 764                 READ_MOSTLY_DATA(cacheline)                             \
 765                 DATA_DATA                                               \
 766                 CONSTRUCTORS                                            \
 767         }
 768
 769 #define INIT_TEXT_SECTION(inittext_align)                               \
 770         . = ALIGN(inittext_align);                                      \
 771         .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {               \
 772                 VMLINUX_SYMBOL(_sinittext) = .;                         \
 773                 INIT_TEXT                                               \
 774                 VMLINUX_SYMBOL(_einittext) = .;                         \
 775         }
 776
 777 #define INIT_DATA_SECTION(initsetup_align)                              \
 778         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {               \
 779                 INIT_DATA                                               \
 780                 INIT_SETUP(initsetup_align)                             \
 781                 INIT_CALLS                                              \
 782                 CON_INITCALL                                            \
 783                 SECURITY_INITCALL                                       \
 784                 INIT_RAM_FS                                             \
 785         }
 786
 787 #define BSS_SECTION(sbss_align, bss_align, stop_align)                  \
 788         . = ALIGN(sbss_align);                                          \
 789         VMLINUX_SYMBOL(__bss_start) = .;                                \
 790         SBSS(sbss_align)                                                \
 791         BSS(bss_align)                                                  \
 792         . = ALIGN(stop_align);                                          \
 793         VMLINUX_SYMBOL(__bss_stop) = .;