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_ALIGN() . = ALIGN(32)
  71
  72 /* The actual configuration determine if the init/exit sections
  73  * are handled as text/data or they can be discarded (which
  74  * often happens at runtime)
  75  */
  76 #ifdef CONFIG_HOTPLUG
  77 #define DEV_KEEP(sec)    *(.dev##sec)
  78 #define DEV_DISCARD(sec)
  79 #else
  80 #define DEV_KEEP(sec)
  81 #define DEV_DISCARD(sec) *(.dev##sec)
  82 #endif
  83
  84 #ifdef CONFIG_HOTPLUG_CPU
  85 #define CPU_KEEP(sec)    *(.cpu##sec)
  86 #define CPU_DISCARD(sec)
  87 #else
  88 #define CPU_KEEP(sec)
  89 #define CPU_DISCARD(sec) *(.cpu##sec)
  90 #endif
  91
  92 #if defined(CONFIG_MEMORY_HOTPLUG)
  93 #define MEM_KEEP(sec)    *(.mem##sec)
  94 #define MEM_DISCARD(sec)
  95 #else
  96 #define MEM_KEEP(sec)
  97 #define MEM_DISCARD(sec) *(.mem##sec)
  98 #endif
  99
 100 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
 101 #define MCOUNT_REC()    . = ALIGN(8);                           \
 102                         VMLINUX_SYMBOL(__start_mcount_loc) = .; \
 103                         *(__mcount_loc)                         \
 104                         VMLINUX_SYMBOL(__stop_mcount_loc) = .;
 105 #else
 106 #define MCOUNT_REC()
 107 #endif
 108
 109 #ifdef CONFIG_TRACE_BRANCH_PROFILING
 110 #define LIKELY_PROFILE()        VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \
 111                                 *(_ftrace_annotated_branch)                           \
 112                                 VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .;
 113 #else
 114 #define LIKELY_PROFILE()
 115 #endif
 116
 117 #ifdef CONFIG_PROFILE_ALL_BRANCHES
 118 #define BRANCH_PROFILE()        VMLINUX_SYMBOL(__start_branch_profile) = .;   \
 119                                 *(_ftrace_branch)                             \
 120                                 VMLINUX_SYMBOL(__stop_branch_profile) = .;
 121 #else
 122 #define BRANCH_PROFILE()
 123 #endif
 124
 125 #ifdef CONFIG_EVENT_TRACING
 126 #define FTRACE_EVENTS() VMLINUX_SYMBOL(__start_ftrace_events) = .;      \
 127                         *(_ftrace_events)                               \
 128                         VMLINUX_SYMBOL(__stop_ftrace_events) = .;
 129 #else
 130 #define FTRACE_EVENTS()
 131 #endif
 132
 133 #ifdef CONFIG_TRACING
 134 #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .;      \
 135                          *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \
 136                          VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;
 137 #else
 138 #define TRACE_PRINTKS()
 139 #endif
 140
 141 #ifdef CONFIG_FTRACE_SYSCALLS
 142 #define TRACE_SYSCALLS() VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \
 143                          *(__syscalls_metadata)                         \
 144                          VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
 145 #else
 146 #define TRACE_SYSCALLS()
 147 #endif
 148
 149 /* .data section */
 150 #define DATA_DATA                                                       \
 151         *(.data)                                                        \
 152         *(.ref.data)                                                    \
 153         DEV_KEEP(init.data)                                             \
 154         DEV_KEEP(exit.data)                                             \
 155         CPU_KEEP(init.data)                                             \
 156         CPU_KEEP(exit.data)                                             \
 157         MEM_KEEP(init.data)                                             \
 158         MEM_KEEP(exit.data)                                             \
 159         . = ALIGN(32);                                                  \
 160         VMLINUX_SYMBOL(__start___tracepoints) = .;                      \
 161         *(__tracepoints)                                                \
 162         VMLINUX_SYMBOL(__stop___tracepoints) = .;                       \
 163         /* implement dynamic printk debug */                            \
 164         . = ALIGN(8);                                                   \
 165         VMLINUX_SYMBOL(__start___verbose) = .;                          \
 166         *(__verbose)                                                    \
 167         VMLINUX_SYMBOL(__stop___verbose) = .;                           \
 168         LIKELY_PROFILE()                                                \
 169         BRANCH_PROFILE()                                                \
 170         TRACE_PRINTKS()                                                 \
 171                                                                         \
 172         STRUCT_ALIGN();                                                 \
 173         FTRACE_EVENTS()                                                 \
 174                                                                         \
 175         STRUCT_ALIGN();                                                 \
 176         TRACE_SYSCALLS()
 177
 178 /*
 179  * Data section helpers
 180  */
 181 #define NOSAVE_DATA                                                     \
 182         . = ALIGN(PAGE_SIZE);                                           \
 183         VMLINUX_SYMBOL(__nosave_begin) = .;                             \
 184         *(.data..nosave)                                                \
 185         . = ALIGN(PAGE_SIZE);                                           \
 186         VMLINUX_SYMBOL(__nosave_end) = .;
 187
 188 #define PAGE_ALIGNED_DATA(page_align)                                   \
 189         . = ALIGN(page_align);                                          \
 190         *(.data..page_aligned)
 191
 192 #define READ_MOSTLY_DATA(align)                                         \
 193         . = ALIGN(align);                                               \
 194         *(.data..read_mostly)
 195
 196 #define CACHELINE_ALIGNED_DATA(align)                                   \
 197         . = ALIGN(align);                                               \
 198         *(.data..cacheline_aligned)
 199
 200 #define INIT_TASK_DATA(align)                                           \
 201         . = ALIGN(align);                                               \
 202         *(.data..init_task)
 203
 204 /*
 205  * Read only Data
 206  */
 207 #define RO_DATA_SECTION(align)                                          \
 208         . = ALIGN((align));                                             \
 209         .rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {           \
 210                 VMLINUX_SYMBOL(__start_rodata) = .;                     \
 211                 *(.rodata) *(.rodata.*)                                 \
 212                 *(__vermagic)           /* Kernel version magic */      \
 213                 *(__markers_strings)    /* Markers: strings */          \
 214                 *(__tracepoints_strings)/* Tracepoints: strings */      \
 215         }                                                               \
 216                                                                         \
 217         .rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {          \
 218                 *(.rodata1)                                             \
 219         }                                                               \
 220                                                                         \
 221         BUG_TABLE                                                       \
 222                                                                         \
 223         JUMP_TABLE                                                      \
 224                                                                         \
 225         /* PCI quirks */                                                \
 226         .pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {        \
 227                 VMLINUX_SYMBOL(__start_pci_fixups_early) = .;           \
 228                 *(.pci_fixup_early)                                     \
 229                 VMLINUX_SYMBOL(__end_pci_fixups_early) = .;             \
 230                 VMLINUX_SYMBOL(__start_pci_fixups_header) = .;          \
 231                 *(.pci_fixup_header)                                    \
 232                 VMLINUX_SYMBOL(__end_pci_fixups_header) = .;            \
 233                 VMLINUX_SYMBOL(__start_pci_fixups_final) = .;           \
 234                 *(.pci_fixup_final)                                     \
 235                 VMLINUX_SYMBOL(__end_pci_fixups_final) = .;             \
 236                 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .;          \
 237                 *(.pci_fixup_enable)                                    \
 238                 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .;            \
 239                 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .;          \
 240                 *(.pci_fixup_resume)                                    \
 241                 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .;            \
 242                 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .;    \
 243                 *(.pci_fixup_resume_early)                              \
 244                 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .;      \
 245                 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .;         \
 246                 *(.pci_fixup_suspend)                                   \
 247                 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .;           \
 248         }                                                               \
 249                                                                         \
 250         /* Built-in firmware blobs */                                   \
 251         .builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {      \
 252                 VMLINUX_SYMBOL(__start_builtin_fw) = .;                 \
 253                 *(.builtin_fw)                                          \
 254                 VMLINUX_SYMBOL(__end_builtin_fw) = .;                   \
 255         }                                                               \
 256                                                                         \
 257         /* RapidIO route ops */                                         \
 258         .rio_ops        : AT(ADDR(.rio_ops) - LOAD_OFFSET) {            \
 259                 VMLINUX_SYMBOL(__start_rio_switch_ops) = .;             \
 260                 *(.rio_switch_ops)                                      \
 261                 VMLINUX_SYMBOL(__end_rio_switch_ops) = .;               \
 262         }                                                               \
 263                                                                         \
 264         TRACEDATA                                                       \
 265                                                                         \
 266         /* Kernel symbol table: Normal symbols */                       \
 267         __ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {         \
 268                 VMLINUX_SYMBOL(__start___ksymtab) = .;                  \
 269                 *(__ksymtab)                                            \
 270                 VMLINUX_SYMBOL(__stop___ksymtab) = .;                   \
 271         }                                                               \
 272                                                                         \
 273         /* Kernel symbol table: GPL-only symbols */                     \
 274         __ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {     \
 275                 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .;              \
 276                 *(__ksymtab_gpl)                                        \
 277                 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .;               \
 278         }                                                               \
 279                                                                         \
 280         /* Kernel symbol table: Normal unused symbols */                \
 281         __ksymtab_unused  : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) {  \
 282                 VMLINUX_SYMBOL(__start___ksymtab_unused) = .;           \
 283                 *(__ksymtab_unused)                                     \
 284                 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .;            \
 285         }                                                               \
 286                                                                         \
 287         /* Kernel symbol table: GPL-only unused symbols */              \
 288         __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
 289                 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .;       \
 290                 *(__ksymtab_unused_gpl)                                 \
 291                 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .;        \
 292         }                                                               \
 293                                                                         \
 294         /* Kernel symbol table: GPL-future-only symbols */              \
 295         __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
 296                 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .;       \
 297                 *(__ksymtab_gpl_future)                                 \
 298                 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .;        \
 299         }                                                               \
 300                                                                         \
 301         /* Kernel symbol table: Normal symbols */                       \
 302         __kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {         \
 303                 VMLINUX_SYMBOL(__start___kcrctab) = .;                  \
 304                 *(__kcrctab)                                            \
 305                 VMLINUX_SYMBOL(__stop___kcrctab) = .;                   \
 306         }                                                               \
 307                                                                         \
 308         /* Kernel symbol table: GPL-only symbols */                     \
 309         __kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {     \
 310                 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .;              \
 311                 *(__kcrctab_gpl)                                        \
 312                 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .;               \
 313         }                                                               \
 314                                                                         \
 315         /* Kernel symbol table: Normal unused symbols */                \
 316         __kcrctab_unused  : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) {  \
 317                 VMLINUX_SYMBOL(__start___kcrctab_unused) = .;           \
 318                 *(__kcrctab_unused)                                     \
 319                 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .;            \
 320         }                                                               \
 321                                                                         \
 322         /* Kernel symbol table: GPL-only unused symbols */              \
 323         __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
 324                 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .;       \
 325                 *(__kcrctab_unused_gpl)                                 \
 326                 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .;        \
 327         }                                                               \
 328                                                                         \
 329         /* Kernel symbol table: GPL-future-only symbols */              \
 330         __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
 331                 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .;       \
 332                 *(__kcrctab_gpl_future)                                 \
 333                 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .;        \
 334         }                                                               \
 335                                                                         \
 336         /* Kernel symbol table: strings */                              \
 337         __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
 338                 *(__ksymtab_strings)                                    \
 339         }                                                               \
 340                                                                         \
 341         /* __*init sections */                                          \
 342         __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {         \
 343                 *(.ref.rodata)                                          \
 344                 DEV_KEEP(init.rodata)                                   \
 345                 DEV_KEEP(exit.rodata)                                   \
 346                 CPU_KEEP(init.rodata)                                   \
 347                 CPU_KEEP(exit.rodata)                                   \
 348                 MEM_KEEP(init.rodata)                                   \
 349                 MEM_KEEP(exit.rodata)                                   \
 350         }                                                               \
 351                                                                         \
 352         /* Built-in module parameters. */                               \
 353         __param : AT(ADDR(__param) - LOAD_OFFSET) {                     \
 354                 VMLINUX_SYMBOL(__start___param) = .;                    \
 355                 *(__param)                                              \
 356                 VMLINUX_SYMBOL(__stop___param) = .;                     \
 357                 . = ALIGN((align));                                     \
 358                 VMLINUX_SYMBOL(__end_rodata) = .;                       \
 359         }                                                               \
 360         . = ALIGN((align));
 361
 362 /* RODATA & RO_DATA provided for backward compatibility.
 363  * All archs are supposed to use RO_DATA() */
 364 #define RODATA          RO_DATA_SECTION(4096)
 365 #define RO_DATA(align)  RO_DATA_SECTION(align)
 366
 367 #define SECURITY_INIT                                                   \
 368         .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
 369                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 370                 *(.security_initcall.init)                              \
 371                 VMLINUX_SYMBOL(__security_initcall_end) = .;            \
 372         }
 373
 374 /* .text section. Map to function alignment to avoid address changes
 375  * during second ld run in second ld pass when generating System.map */
 376 #define TEXT_TEXT                                                       \
 377                 ALIGN_FUNCTION();                                       \
 378                 *(.text.hot)                                            \
 379                 *(.text)                                                \
 380                 *(.ref.text)                                            \
 381         DEV_KEEP(init.text)                                             \
 382         DEV_KEEP(exit.text)                                             \
 383         CPU_KEEP(init.text)                                             \
 384         CPU_KEEP(exit.text)                                             \
 385         MEM_KEEP(init.text)                                             \
 386         MEM_KEEP(exit.text)                                             \
 387                 *(.text.unlikely)
 388
 389
 390 /* sched.text is aling to function alignment to secure we have same
 391  * address even at second ld pass when generating System.map */
 392 #define SCHED_TEXT                                                      \
 393                 ALIGN_FUNCTION();                                       \
 394                 VMLINUX_SYMBOL(__sched_text_start) = .;                 \
 395                 *(.sched.text)                                          \
 396                 VMLINUX_SYMBOL(__sched_text_end) = .;
 397
 398 /* spinlock.text is aling to function alignment to secure we have same
 399  * address even at second ld pass when generating System.map */
 400 #define LOCK_TEXT                                                       \
 401                 ALIGN_FUNCTION();                                       \
 402                 VMLINUX_SYMBOL(__lock_text_start) = .;                  \
 403                 *(.spinlock.text)                                       \
 404                 VMLINUX_SYMBOL(__lock_text_end) = .;
 405
 406 #define KPROBES_TEXT                                                    \
 407                 ALIGN_FUNCTION();                                       \
 408                 VMLINUX_SYMBOL(__kprobes_text_start) = .;               \
 409                 *(.kprobes.text)                                        \
 410                 VMLINUX_SYMBOL(__kprobes_text_end) = .;
 411
 412 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 413 #define IRQENTRY_TEXT                                                   \
 414                 ALIGN_FUNCTION();                                       \
 415                 VMLINUX_SYMBOL(__irqentry_text_start) = .;              \
 416                 *(.irqentry.text)                                       \
 417                 VMLINUX_SYMBOL(__irqentry_text_end) = .;
 418 #else
 419 #define IRQENTRY_TEXT
 420 #endif
 421
 422 /* Section used for early init (in .S files) */
 423 #define HEAD_TEXT  *(.head.text)
 424
 425 #define HEAD_TEXT_SECTION                                                       \
 426         .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {               \
 427                 HEAD_TEXT                                               \
 428         }
 429
 430 /*
 431  * Exception table
 432  */
 433 #define EXCEPTION_TABLE(align)                                          \
 434         . = ALIGN(align);                                               \
 435         __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {               \
 436                 VMLINUX_SYMBOL(__start___ex_table) = .;                 \
 437                 *(__ex_table)                                           \
 438                 VMLINUX_SYMBOL(__stop___ex_table) = .;                  \
 439         }
 440
 441 /*
 442  * Init task
 443  */
 444 #define INIT_TASK_DATA_SECTION(align)                                   \
 445         . = ALIGN(align);                                               \
 446         .data..init_task :  AT(ADDR(.data..init_task) - LOAD_OFFSET) {  \
 447                 INIT_TASK_DATA(align)                                   \
 448         }
 449
 450 #ifdef CONFIG_CONSTRUCTORS
 451 #define KERNEL_CTORS()  . = ALIGN(8);                      \
 452                         VMLINUX_SYMBOL(__ctors_start) = .; \
 453                         *(.ctors)                          \
 454                         VMLINUX_SYMBOL(__ctors_end) = .;
 455 #else
 456 #define KERNEL_CTORS()
 457 #endif
 458
 459 /* init and exit section handling */
 460 #define INIT_DATA                                                       \
 461         *(.init.data)                                                   \
 462         DEV_DISCARD(init.data)                                          \
 463         CPU_DISCARD(init.data)                                          \
 464         MEM_DISCARD(init.data)                                          \
 465         KERNEL_CTORS()                                                  \
 466         *(.init.rodata)                                                 \
 467         MCOUNT_REC()                                                    \
 468         DEV_DISCARD(init.rodata)                                        \
 469         CPU_DISCARD(init.rodata)                                        \
 470         MEM_DISCARD(init.rodata)
 471
 472 #define INIT_TEXT                                                       \
 473         *(.init.text)                                                   \
 474         DEV_DISCARD(init.text)                                          \
 475         CPU_DISCARD(init.text)                                          \
 476         MEM_DISCARD(init.text)
 477
 478 #define EXIT_DATA                                                       \
 479         *(.exit.data)                                                   \
 480         DEV_DISCARD(exit.data)                                          \
 481         DEV_DISCARD(exit.rodata)                                        \
 482         CPU_DISCARD(exit.data)                                          \
 483         CPU_DISCARD(exit.rodata)                                        \
 484         MEM_DISCARD(exit.data)                                          \
 485         MEM_DISCARD(exit.rodata)
 486
 487 #define EXIT_TEXT                                                       \
 488         *(.exit.text)                                                   \
 489         DEV_DISCARD(exit.text)                                          \
 490         CPU_DISCARD(exit.text)                                          \
 491         MEM_DISCARD(exit.text)
 492
 493 #define EXIT_CALL                                                       \
 494         *(.exitcall.exit)
 495
 496 /*
 497  * bss (Block Started by Symbol) - uninitialized data
 498  * zeroed during startup
 499  */
 500 #define SBSS(sbss_align)                                                \
 501         . = ALIGN(sbss_align);                                          \
 502         .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {                         \
 503                 *(.sbss)                                                \
 504                 *(.scommon)                                             \
 505         }
 506
 507 #define BSS(bss_align)                                                  \
 508         . = ALIGN(bss_align);                                           \
 509         .bss : AT(ADDR(.bss) - LOAD_OFFSET) {                           \
 510                 *(.bss..page_aligned)                                   \
 511                 *(.dynbss)                                              \
 512                 *(.bss)                                                 \
 513                 *(COMMON)                                               \
 514         }
 515
 516 /*
 517  * DWARF debug sections.
 518  * Symbols in the DWARF debugging sections are relative to
 519  * the beginning of the section so we begin them at 0.
 520  */
 521 #define DWARF_DEBUG                                                     \
 522                 /* DWARF 1 */                                           \
 523                 .debug          0 : { *(.debug) }                       \
 524                 .line           0 : { *(.line) }                        \
 525                 /* GNU DWARF 1 extensions */                            \
 526                 .debug_srcinfo  0 : { *(.debug_srcinfo) }               \
 527                 .debug_sfnames  0 : { *(.debug_sfnames) }               \
 528                 /* DWARF 1.1 and DWARF 2 */                             \
 529                 .debug_aranges  0 : { *(.debug_aranges) }               \
 530                 .debug_pubnames 0 : { *(.debug_pubnames) }              \
 531                 /* DWARF 2 */                                           \
 532                 .debug_info     0 : { *(.debug_info                     \
 533                                 .gnu.linkonce.wi.*) }                   \
 534                 .debug_abbrev   0 : { *(.debug_abbrev) }                \
 535                 .debug_line     0 : { *(.debug_line) }                  \
 536                 .debug_frame    0 : { *(.debug_frame) }                 \
 537                 .debug_str      0 : { *(.debug_str) }                   \
 538                 .debug_loc      0 : { *(.debug_loc) }                   \
 539                 .debug_macinfo  0 : { *(.debug_macinfo) }               \
 540                 /* SGI/MIPS DWARF 2 extensions */                       \
 541                 .debug_weaknames 0 : { *(.debug_weaknames) }            \
 542                 .debug_funcnames 0 : { *(.debug_funcnames) }            \
 543                 .debug_typenames 0 : { *(.debug_typenames) }            \
 544                 .debug_varnames  0 : { *(.debug_varnames) }             \
 545
 546                 /* Stabs debugging sections.  */
 547 #define STABS_DEBUG                                                     \
 548                 .stab 0 : { *(.stab) }                                  \
 549                 .stabstr 0 : { *(.stabstr) }                            \
 550                 .stab.excl 0 : { *(.stab.excl) }                        \
 551                 .stab.exclstr 0 : { *(.stab.exclstr) }                  \
 552                 .stab.index 0 : { *(.stab.index) }                      \
 553                 .stab.indexstr 0 : { *(.stab.indexstr) }                \
 554                 .comment 0 : { *(.comment) }
 555
 556 #ifdef CONFIG_GENERIC_BUG
 557 #define BUG_TABLE                                                       \
 558         . = ALIGN(8);                                                   \
 559         __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {             \
 560                 VMLINUX_SYMBOL(__start___bug_table) = .;                \
 561                 *(__bug_table)                                          \
 562                 VMLINUX_SYMBOL(__stop___bug_table) = .;                 \
 563         }
 564 #else
 565 #define BUG_TABLE
 566 #endif
 567
 568 #define JUMP_TABLE                                                      \
 569         . = ALIGN(8);                                                   \
 570         __jump_table : AT(ADDR(__jump_table) - LOAD_OFFSET) {           \
 571                 VMLINUX_SYMBOL(__start___jump_table) = .;               \
 572                 *(__jump_table)                                         \
 573                 VMLINUX_SYMBOL(__stop___jump_table) = .;                \
 574         }
 575
 576 #ifdef CONFIG_PM_TRACE
 577 #define TRACEDATA                                                       \
 578         . = ALIGN(4);                                                   \
 579         .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {               \
 580                 VMLINUX_SYMBOL(__tracedata_start) = .;                  \
 581                 *(.tracedata)                                           \
 582                 VMLINUX_SYMBOL(__tracedata_end) = .;                    \
 583         }
 584 #else
 585 #define TRACEDATA
 586 #endif
 587
 588 #define NOTES                                                           \
 589         .notes : AT(ADDR(.notes) - LOAD_OFFSET) {                       \
 590                 VMLINUX_SYMBOL(__start_notes) = .;                      \
 591                 *(.note.*)                                              \
 592                 VMLINUX_SYMBOL(__stop_notes) = .;                       \
 593         }
 594
 595 #define INIT_SETUP(initsetup_align)                                     \
 596                 . = ALIGN(initsetup_align);                             \
 597                 VMLINUX_SYMBOL(__setup_start) = .;                      \
 598                 *(.init.setup)                                          \
 599                 VMLINUX_SYMBOL(__setup_end) = .;
 600
 601 #define INITCALLS                                                       \
 602         *(.initcallearly.init)                                          \
 603         VMLINUX_SYMBOL(__early_initcall_end) = .;                       \
 604         *(.initcall0.init)                                              \
 605         *(.initcall0s.init)                                             \
 606         *(.initcall1.init)                                              \
 607         *(.initcall1s.init)                                             \
 608         *(.initcall2.init)                                              \
 609         *(.initcall2s.init)                                             \
 610         *(.initcall3.init)                                              \
 611         *(.initcall3s.init)                                             \
 612         *(.initcall4.init)                                              \
 613         *(.initcall4s.init)                                             \
 614         *(.initcall5.init)                                              \
 615         *(.initcall5s.init)                                             \
 616         *(.initcallrootfs.init)                                         \
 617         *(.initcall6.init)                                              \
 618         *(.initcall6s.init)                                             \
 619         *(.initcall7.init)                                              \
 620         *(.initcall7s.init)
 621
 622 #define INIT_CALLS                                                      \
 623                 VMLINUX_SYMBOL(__initcall_start) = .;                   \
 624                 INITCALLS                                               \
 625                 VMLINUX_SYMBOL(__initcall_end) = .;
 626
 627 #define CON_INITCALL                                                    \
 628                 VMLINUX_SYMBOL(__con_initcall_start) = .;               \
 629                 *(.con_initcall.init)                                   \
 630                 VMLINUX_SYMBOL(__con_initcall_end) = .;
 631
 632 #define SECURITY_INITCALL                                               \
 633                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 634                 *(.security_initcall.init)                              \
 635                 VMLINUX_SYMBOL(__security_initcall_end) = .;
 636
 637 #ifdef CONFIG_BLK_DEV_INITRD
 638 #define INIT_RAM_FS                                                     \
 639         . = ALIGN(PAGE_SIZE);                                           \
 640         VMLINUX_SYMBOL(__initramfs_start) = .;                          \
 641         *(.init.ramfs)                                                  \
 642         VMLINUX_SYMBOL(__initramfs_end) = .;
 643 #else
 644 #define INIT_RAM_FS
 645 #endif
 646
 647 /*
 648  * Default discarded sections.
 649  *
 650  * Some archs want to discard exit text/data at runtime rather than
 651  * link time due to cross-section references such as alt instructions,
 652  * bug table, eh_frame, etc.  DISCARDS must be the last of output
 653  * section definitions so that such archs put those in earlier section
 654  * definitions.
 655  */
 656 #define DISCARDS                                                        \
 657         /DISCARD/ : {                                                   \
 658         EXIT_TEXT                                                       \
 659         EXIT_DATA                                                       \
 660         EXIT_CALL                                                       \
 661         *(.discard)                                                     \
 662         *(.discard.*)                                                   \
 663         }
 664
 665 /**
 666  * PERCPU_VADDR - define output section for percpu area
 667  * @vaddr: explicit base address (optional)
 668  * @phdr: destination PHDR (optional)
 669  *
 670  * Macro which expands to output section for percpu area.  If @vaddr
 671  * is not blank, it specifies explicit base address and all percpu
 672  * symbols will be offset from the given address.  If blank, @vaddr
 673  * always equals @laddr + LOAD_OFFSET.
 674  *
 675  * @phdr defines the output PHDR to use if not blank.  Be warned that
 676  * output PHDR is sticky.  If @phdr is specified, the next output
 677  * section in the linker script will go there too.  @phdr should have
 678  * a leading colon.
 679  *
 680  * Note that this macros defines __per_cpu_load as an absolute symbol.
 681  * If there is no need to put the percpu section at a predetermined
 682  * address, use PERCPU().
 683  */
 684 #define PERCPU_VADDR(vaddr, phdr)                                       \
 685         VMLINUX_SYMBOL(__per_cpu_load) = .;                             \
 686         .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load)         \
 687                                 - LOAD_OFFSET) {                        \
 688                 VMLINUX_SYMBOL(__per_cpu_start) = .;                    \
 689                 *(.data..percpu..first)                                 \
 690                 . = ALIGN(PAGE_SIZE);                                   \
 691                 *(.data..percpu..page_aligned)                          \
 692                 *(.data..percpu..readmostly)                            \
 693                 *(.data..percpu)                                        \
 694                 *(.data..percpu..shared_aligned)                        \
 695                 VMLINUX_SYMBOL(__per_cpu_end) = .;                      \
 696         } phdr                                                          \
 697         . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
 698
 699 /**
 700  * PERCPU - define output section for percpu area, simple version
 701  * @align: required alignment
 702  *
 703  * Align to @align and outputs output section for percpu area.  This
 704  * macro doesn't maniuplate @vaddr or @phdr and __per_cpu_load and
 705  * __per_cpu_start will be identical.
 706  *
 707  * This macro is equivalent to ALIGN(align); PERCPU_VADDR( , ) except
 708  * that __per_cpu_load is defined as a relative symbol against
 709  * .data..percpu which is required for relocatable x86_32
 710  * configuration.
 711  */
 712 #define PERCPU(align)                                                   \
 713         . = ALIGN(align);                                               \
 714         .data..percpu   : AT(ADDR(.data..percpu) - LOAD_OFFSET) {       \
 715                 VMLINUX_SYMBOL(__per_cpu_load) = .;                     \
 716                 VMLINUX_SYMBOL(__per_cpu_start) = .;                    \
 717                 *(.data..percpu..first)                                 \
 718                 . = ALIGN(PAGE_SIZE);                                   \
 719                 *(.data..percpu..page_aligned)                          \
 720                 *(.data..percpu..readmostly)                            \
 721                 *(.data..percpu)                                        \
 722                 *(.data..percpu..shared_aligned)                        \
 723                 VMLINUX_SYMBOL(__per_cpu_end) = .;                      \
 724         }
 725
 726
 727 /*
 728  * Definition of the high level *_SECTION macros
 729  * They will fit only a subset of the architectures
 730  */
 731
 732
 733 /*
 734  * Writeable data.
 735  * All sections are combined in a single .data section.
 736  * The sections following CONSTRUCTORS are arranged so their
 737  * typical alignment matches.
 738  * A cacheline is typical/always less than a PAGE_SIZE so
 739  * the sections that has this restriction (or similar)
 740  * is located before the ones requiring PAGE_SIZE alignment.
 741  * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
 742  * matches the requirment of PAGE_ALIGNED_DATA.
 743  *
 744  * use 0 as page_align if page_aligned data is not used */
 745 #define RW_DATA_SECTION(cacheline, pagealigned, inittask)               \
 746         . = ALIGN(PAGE_SIZE);                                           \
 747         .data : AT(ADDR(.data) - LOAD_OFFSET) {                         \
 748                 INIT_TASK_DATA(inittask)                                \
 749                 NOSAVE_DATA                                             \
 750                 PAGE_ALIGNED_DATA(pagealigned)                          \
 751                 CACHELINE_ALIGNED_DATA(cacheline)                       \
 752                 READ_MOSTLY_DATA(cacheline)                             \
 753                 DATA_DATA                                               \
 754                 CONSTRUCTORS                                            \
 755         }
 756
 757 #define INIT_TEXT_SECTION(inittext_align)                               \
 758         . = ALIGN(inittext_align);                                      \
 759         .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {               \
 760                 VMLINUX_SYMBOL(_sinittext) = .;                         \
 761                 INIT_TEXT                                               \
 762                 VMLINUX_SYMBOL(_einittext) = .;                         \
 763         }
 764
 765 #define INIT_DATA_SECTION(initsetup_align)                              \
 766         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {               \
 767                 INIT_DATA                                               \
 768                 INIT_SETUP(initsetup_align)                             \
 769                 INIT_CALLS                                              \
 770                 CON_INITCALL                                            \
 771                 SECURITY_INITCALL                                       \
 772                 INIT_RAM_FS                                             \
 773         }
 774
 775 #define BSS_SECTION(sbss_align, bss_align, stop_align)                  \
 776         . = ALIGN(sbss_align);                                          \
 777         VMLINUX_SYMBOL(__bss_start) = .;                                \
 778         SBSS(sbss_align)                                                \
 779         BSS(bss_align)                                                  \
 780         . = ALIGN(stop_align);                                          \
 781         VMLINUX_SYMBOL(__bss_stop) = .;