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