include/asm-generic/vmlinux.lds.h

   1 /*
   2  * Helper macros to support writing architecture specific
   3  * linker scripts.
   4  *
   5  * A minimal linker scripts has following content:
   6  * [This is a sample, architectures may have special requiriements]
   7  *
   8  * OUTPUT_FORMAT(...)
   9  * OUTPUT_ARCH(...)
  10  * ENTRY(...)
  11  * SECTIONS
  12  * {
  13  *      . = START;
  14  *      __init_begin = .;
  15  *      HEAD_TEXT_SECTION
  16  *      INIT_TEXT_SECTION(PAGE_SIZE)
  17  *      INIT_DATA_SECTION(...)
  18  *      PERCPU_SECTION(CACHELINE_SIZE)
  19  *      __init_end = .;
  20  *
  21  *      _stext = .;
  22  *      TEXT_SECTION = 0
  23  *      _etext = .;
  24  *
  25  *      _sdata = .;
  26  *      RO_DATA_SECTION(PAGE_SIZE)
  27  *      RW_DATA_SECTION(...)
  28  *      _edata = .;
  29  *
  30  *      EXCEPTION_TABLE(...)
  31  *      NOTES
  32  *
  33  *      BSS_SECTION(0, 0, 0)
  34  *      _end = .;
  35  *
  36  *      STABS_DEBUG
  37  *      DWARF_DEBUG
  38  *
  39  *      DISCARDS                // must be the last
  40  * }
  41  *
  42  * [__init_begin, __init_end] is the init section that may be freed after init
  43  * [_stext, _etext] is the text section
  44  * [_sdata, _edata] is the data section
  45  *
  46  * Some of the included output section have their own set of constants.
  47  * Examples are: [__initramfs_start, __initramfs_end] for initramfs and
  48  *               [__nosave_begin, __nosave_end] for the nosave data
  49  */
  50
  51 #ifndef LOAD_OFFSET
  52 #define LOAD_OFFSET 0
  53 #endif
  54
  55 #ifndef SYMBOL_PREFIX
  56 #define VMLINUX_SYMBOL(sym) sym
  57 #else
  58 #define PASTE2(x,y) x##y
  59 #define PASTE(x,y) PASTE2(x,y)
  60 #define VMLINUX_SYMBOL(sym) PASTE(SYMBOL_PREFIX, sym)
  61 #endif
  62
  63 /* Align . to a 8 byte boundary equals to maximum function alignment. */
  64 #define ALIGN_FUNCTION()  . = ALIGN(8)
  65
  66 /*
  67  * Align to a 32 byte boundary equal to the
  68  * alignment gcc 4.5 uses for a struct
  69  */
  70 #define STRUCT_ALIGNMENT 32
  71 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
  72
  73 /* The actual configuration determine if the init/exit sections
  74  * are handled as text/data or they can be discarded (which
  75  * often happens at runtime)
  76  */
  77 #ifdef CONFIG_HOTPLUG
  78 #define DEV_KEEP(sec)    *(.dev##sec)
  79 #define DEV_DISCARD(sec)
  80 #else
  81 #define DEV_KEEP(sec)
  82 #define DEV_DISCARD(sec) *(.dev##sec)
  83 #endif
  84
  85 #ifdef CONFIG_HOTPLUG_CPU
  86 #define CPU_KEEP(sec)    *(.cpu##sec)
  87 #define CPU_DISCARD(sec)
  88 #else
  89 #define CPU_KEEP(sec)
  90 #define CPU_DISCARD(sec) *(.cpu##sec)
  91 #endif
  92
  93 #if defined(CONFIG_MEMORY_HOTPLUG)
  94 #define MEM_KEEP(sec)    *(.mem##sec)
  95 #define MEM_DISCARD(sec)
  96 #else
  97 #define MEM_KEEP(sec)
  98 #define MEM_DISCARD(sec) *(.mem##sec)
  99 #endif
 100
 101 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
 102 #define MCOUNT_REC()    . = ALIGN(8);                           \
 103                         VMLINUX_SYMBOL(__start_mcount_loc) = .; \
 104                         *(__mcount_loc)                         \
 105                         VMLINUX_SYMBOL(__stop_mcount_loc) = .;
 106 #else
 107 #define MCOUNT_REC()
 108 #endif
 109
 110 #ifdef CONFIG_TRACE_BRANCH_PROFILING
 111 #define LIKELY_PROFILE()        VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \
 112                                 *(_ftrace_annotated_branch)                           \
 113                                 VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .;
 114 #else
 115 #define LIKELY_PROFILE()
 116 #endif
 117
 118 #ifdef CONFIG_PROFILE_ALL_BRANCHES
 119 #define BRANCH_PROFILE()        VMLINUX_SYMBOL(__start_branch_profile) = .;   \
 120                                 *(_ftrace_branch)                             \
 121                                 VMLINUX_SYMBOL(__stop_branch_profile) = .;
 122 #else
 123 #define BRANCH_PROFILE()
 124 #endif
 125
 126 #ifdef CONFIG_EVENT_TRACING
 127 #define FTRACE_EVENTS() . = ALIGN(8);                                   \
 128                         VMLINUX_SYMBOL(__start_ftrace_events) = .;      \
 129                         *(_ftrace_events)                               \
 130                         VMLINUX_SYMBOL(__stop_ftrace_events) = .;
 131 #else
 132 #define FTRACE_EVENTS()
 133 #endif
 134
 135 #ifdef CONFIG_TRACING
 136 #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .;      \
 137                          *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \
 138                          VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;
 139 #else
 140 #define TRACE_PRINTKS()
 141 #endif
 142
 143 #ifdef CONFIG_FTRACE_SYSCALLS
 144 #define TRACE_SYSCALLS() . = ALIGN(8);                                  \
 145                          VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \
 146                          *(__syscalls_metadata)                         \
 147                          VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
 148 #else
 149 #define TRACE_SYSCALLS()
 150 #endif
 151
 152
 153 #define KERNEL_DTB()                                                    \
 154         STRUCT_ALIGN();                                                 \
 155         VMLINUX_SYMBOL(__dtb_start) = .;                                \
 156         *(.dtb.init.rodata)                                             \
 157         VMLINUX_SYMBOL(__dtb_end) = .;
 158
 159 /* .data section */
 160 #define DATA_DATA                                                       \
 161         *(.data)                                                        \
 162         *(.ref.data)                                                    \
 163         *(.data..shared_aligned) /* percpu related */                   \
 164         DEV_KEEP(init.data)                                             \
 165         DEV_KEEP(exit.data)                                             \
 166         CPU_KEEP(init.data)                                             \
 167         CPU_KEEP(exit.data)                                             \
 168         MEM_KEEP(init.data)                                             \
 169         MEM_KEEP(exit.data)                                             \
 170         STRUCT_ALIGN();                                                 \
 171         *(__tracepoints)                                                \
 172         /* implement dynamic printk debug */                            \
 173         . = ALIGN(8);                                                   \
 174         VMLINUX_SYMBOL(__start___jump_table) = .;                       \
 175         *(__jump_table)                                                 \
 176         VMLINUX_SYMBOL(__stop___jump_table) = .;                        \
 177         . = ALIGN(8);                                                   \
 178         VMLINUX_SYMBOL(__start___verbose) = .;                          \
 179         *(__verbose)                                                    \
 180         VMLINUX_SYMBOL(__stop___verbose) = .;                           \
 181         LIKELY_PROFILE()                                                \
 182         BRANCH_PROFILE()                                                \
 183         TRACE_PRINTKS()
 184
 185 /*
 186  * Data section helpers
 187  */
 188 #define NOSAVE_DATA                                                     \
 189         . = ALIGN(PAGE_SIZE);                                           \
 190         VMLINUX_SYMBOL(__nosave_begin) = .;                             \
 191         *(.data..nosave)                                                \
 192         . = ALIGN(PAGE_SIZE);                                           \
 193         VMLINUX_SYMBOL(__nosave_end) = .;
 194
 195 #define PAGE_ALIGNED_DATA(page_align)                                   \
 196         . = ALIGN(page_align);                                          \
 197         *(.data..page_aligned)
 198
 199 #define READ_MOSTLY_DATA(align)                                         \
 200         . = ALIGN(align);                                               \
 201         *(.data..read_mostly)                                           \
 202         . = ALIGN(align);
 203
 204 #define CACHELINE_ALIGNED_DATA(align)                                   \
 205         . = ALIGN(align);                                               \
 206         *(.data..cacheline_aligned)
 207
 208 #define INIT_TASK_DATA(align)                                           \
 209         . = ALIGN(align);                                               \
 210         *(.data..init_task)
 211
 212 /*
 213  * Read only Data
 214  */
 215 #define RO_DATA_SECTION(align)                                          \
 216         . = ALIGN((align));                                             \
 217         .rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {           \
 218                 VMLINUX_SYMBOL(__start_rodata) = .;                     \
 219                 *(.rodata) *(.rodata.*)                                 \
 220                 *(__vermagic)           /* Kernel version magic */      \
 221                 . = ALIGN(8);                                           \
 222                 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .;         \
 223                 *(__tracepoints_ptrs)   /* Tracepoints: pointer array */\
 224                 VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .;          \
 225                 *(__tracepoints_strings)/* Tracepoints: strings */      \
 226         }                                                               \
 227                                                                         \
 228         .rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {          \
 229                 *(.rodata1)                                             \
 230         }                                                               \
 231                                                                         \
 232         BUG_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                 *(SORT(___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                 *(SORT(___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                 *(SORT(___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                 *(SORT(___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                 *(SORT(___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                 *(SORT(___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                 *(SORT(___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                 *(SORT(___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                 *(SORT(___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                 *(SORT(___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         }                                                               \
 367                                                                         \
 368         /* Built-in module versions. */                                 \
 369         __modver : AT(ADDR(__modver) - LOAD_OFFSET) {                   \
 370                 VMLINUX_SYMBOL(__start___modver) = .;                   \
 371                 *(__modver)                                             \
 372                 VMLINUX_SYMBOL(__stop___modver) = .;                    \
 373                 . = ALIGN((align));                                     \
 374                 VMLINUX_SYMBOL(__end_rodata) = .;                       \
 375         }                                                               \
 376         . = ALIGN((align));
 377
 378 /* RODATA & RO_DATA provided for backward compatibility.
 379  * All archs are supposed to use RO_DATA() */
 380 #define RODATA          RO_DATA_SECTION(4096)
 381 #define RO_DATA(align)  RO_DATA_SECTION(align)
 382
 383 #define SECURITY_INIT                                                   \
 384         .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
 385                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 386                 *(.security_initcall.init)                              \
 387                 VMLINUX_SYMBOL(__security_initcall_end) = .;            \
 388         }
 389
 390 /* .text section. Map to function alignment to avoid address changes
 391  * during second ld run in second ld pass when generating System.map */
 392 #define TEXT_TEXT                                                       \
 393                 ALIGN_FUNCTION();                                       \
 394                 *(.text.hot)                                            \
 395                 *(.text)                                                \
 396                 *(.ref.text)                                            \
 397         DEV_KEEP(init.text)                                             \
 398         DEV_KEEP(exit.text)                                             \
 399         CPU_KEEP(init.text)                                             \
 400         CPU_KEEP(exit.text)                                             \
 401         MEM_KEEP(init.text)                                             \
 402         MEM_KEEP(exit.text)                                             \
 403                 *(.text.unlikely)
 404
 405
 406 /* sched.text is aling to function alignment to secure we have same
 407  * address even at second ld pass when generating System.map */
 408 #define SCHED_TEXT                                                      \
 409                 ALIGN_FUNCTION();                                       \
 410                 VMLINUX_SYMBOL(__sched_text_start) = .;                 \
 411                 *(.sched.text)                                          \
 412                 VMLINUX_SYMBOL(__sched_text_end) = .;
 413
 414 /* spinlock.text is aling to function alignment to secure we have same
 415  * address even at second ld pass when generating System.map */
 416 #define LOCK_TEXT                                                       \
 417                 ALIGN_FUNCTION();                                       \
 418                 VMLINUX_SYMBOL(__lock_text_start) = .;                  \
 419                 *(.spinlock.text)                                       \
 420                 VMLINUX_SYMBOL(__lock_text_end) = .;
 421
 422 #define KPROBES_TEXT                                                    \
 423                 ALIGN_FUNCTION();                                       \
 424                 VMLINUX_SYMBOL(__kprobes_text_start) = .;               \
 425                 *(.kprobes.text)                                        \
 426                 VMLINUX_SYMBOL(__kprobes_text_end) = .;
 427
 428 #define ENTRY_TEXT                                                      \
 429                 ALIGN_FUNCTION();                                       \
 430                 VMLINUX_SYMBOL(__entry_text_start) = .;                 \
 431                 *(.entry.text)                                          \
 432                 VMLINUX_SYMBOL(__entry_text_end) = .;
 433
 434 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 435 #define IRQENTRY_TEXT                                                   \
 436                 ALIGN_FUNCTION();                                       \
 437                 VMLINUX_SYMBOL(__irqentry_text_start) = .;              \
 438                 *(.irqentry.text)                                       \
 439                 VMLINUX_SYMBOL(__irqentry_text_end) = .;
 440 #else
 441 #define IRQENTRY_TEXT
 442 #endif
 443
 444 /* Section used for early init (in .S files) */
 445 #define HEAD_TEXT  *(.head.text)
 446
 447 #define HEAD_TEXT_SECTION                                                       \
 448         .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {               \
 449                 HEAD_TEXT                                               \
 450         }
 451
 452 /*
 453  * Exception table
 454  */
 455 #define EXCEPTION_TABLE(align)                                          \
 456         . = ALIGN(align);                                               \
 457         __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {               \
 458                 VMLINUX_SYMBOL(__start___ex_table) = .;                 \
 459                 *(__ex_table)                                           \
 460                 VMLINUX_SYMBOL(__stop___ex_table) = .;                  \
 461         }
 462
 463 /*
 464  * Init task
 465  */
 466 #define INIT_TASK_DATA_SECTION(align)                                   \
 467         . = ALIGN(align);                                               \
 468         .data..init_task :  AT(ADDR(.data..init_task) - LOAD_OFFSET) {  \
 469                 INIT_TASK_DATA(align)                                   \
 470         }
 471
 472 #ifdef CONFIG_CONSTRUCTORS
 473 #define KERNEL_CTORS()  . = ALIGN(8);                      \
 474                         VMLINUX_SYMBOL(__ctors_start) = .; \
 475                         *(.ctors)                          \
 476                         VMLINUX_SYMBOL(__ctors_end) = .;
 477 #else
 478 #define KERNEL_CTORS()
 479 #endif
 480
 481 /* init and exit section handling */
 482 #define INIT_DATA                                                       \
 483         *(.init.data)                                                   \
 484         DEV_DISCARD(init.data)                                          \
 485         CPU_DISCARD(init.data)                                          \
 486         MEM_DISCARD(init.data)                                          \
 487         KERNEL_CTORS()                                                  \
 488         *(.init.rodata)                                                 \
 489         MCOUNT_REC()                                                    \
 490         FTRACE_EVENTS()                                                 \
 491         TRACE_SYSCALLS()                                                \
 492         DEV_DISCARD(init.rodata)                                        \
 493         CPU_DISCARD(init.rodata)                                        \
 494         MEM_DISCARD(init.rodata)                                        \
 495         KERNEL_DTB()
 496
 497 #define INIT_TEXT                                                       \
 498         *(.init.text)                                                   \
 499         DEV_DISCARD(init.text)                                          \
 500         CPU_DISCARD(init.text)                                          \
 501         MEM_DISCARD(init.text)
 502
 503 #define EXIT_DATA                                                       \
 504         *(.exit.data)                                                   \
 505         DEV_DISCARD(exit.data)                                          \
 506         DEV_DISCARD(exit.rodata)                                        \
 507         CPU_DISCARD(exit.data)                                          \
 508         CPU_DISCARD(exit.rodata)                                        \
 509         MEM_DISCARD(exit.data)                                          \
 510         MEM_DISCARD(exit.rodata)
 511
 512 #define EXIT_TEXT                                                       \
 513         *(.exit.text)                                                   \
 514         DEV_DISCARD(exit.text)                                          \
 515         CPU_DISCARD(exit.text)                                          \
 516         MEM_DISCARD(exit.text)
 517
 518 #define EXIT_CALL                                                       \
 519         *(.exitcall.exit)
 520
 521 /*
 522  * bss (Block Started by Symbol) - uninitialized data
 523  * zeroed during startup
 524  */
 525 #define SBSS(sbss_align)                                                \
 526         . = ALIGN(sbss_align);                                          \
 527         .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {                         \
 528                 *(.sbss)                                                \
 529                 *(.scommon)                                             \
 530         }
 531
 532 #define BSS(bss_align)                                                  \
 533         . = ALIGN(bss_align);                                           \
 534         .bss : AT(ADDR(.bss) - LOAD_OFFSET) {                           \
 535                 *(.bss..page_aligned)                                   \
 536                 *(.dynbss)                                              \
 537                 *(.bss)                                                 \
 538                 *(COMMON)                                               \
 539         }
 540
 541 /*
 542  * DWARF debug sections.
 543  * Symbols in the DWARF debugging sections are relative to
 544  * the beginning of the section so we begin them at 0.
 545  */
 546 #define DWARF_DEBUG                                                     \
 547                 /* DWARF 1 */                                           \
 548                 .debug          0 : { *(.debug) }                       \
 549                 .line           0 : { *(.line) }                        \
 550                 /* GNU DWARF 1 extensions */                            \
 551                 .debug_srcinfo  0 : { *(.debug_srcinfo) }               \
 552                 .debug_sfnames  0 : { *(.debug_sfnames) }               \
 553                 /* DWARF 1.1 and DWARF 2 */                             \
 554                 .debug_aranges  0 : { *(.debug_aranges) }               \
 555                 .debug_pubnames 0 : { *(.debug_pubnames) }              \
 556                 /* DWARF 2 */                                           \
 557                 .debug_info     0 : { *(.debug_info                     \
 558                                 .gnu.linkonce.wi.*) }                   \
 559                 .debug_abbrev   0 : { *(.debug_abbrev) }                \
 560                 .debug_line     0 : { *(.debug_line) }                  \
 561                 .debug_frame    0 : { *(.debug_frame) }                 \
 562                 .debug_str      0 : { *(.debug_str) }                   \
 563                 .debug_loc      0 : { *(.debug_loc) }                   \
 564                 .debug_macinfo  0 : { *(.debug_macinfo) }               \
 565                 /* SGI/MIPS DWARF 2 extensions */                       \
 566                 .debug_weaknames 0 : { *(.debug_weaknames) }            \
 567                 .debug_funcnames 0 : { *(.debug_funcnames) }            \
 568                 .debug_typenames 0 : { *(.debug_typenames) }            \
 569                 .debug_varnames  0 : { *(.debug_varnames) }             \
 570
 571                 /* Stabs debugging sections.  */
 572 #define STABS_DEBUG                                                     \
 573                 .stab 0 : { *(.stab) }                                  \
 574                 .stabstr 0 : { *(.stabstr) }                            \
 575                 .stab.excl 0 : { *(.stab.excl) }                        \
 576                 .stab.exclstr 0 : { *(.stab.exclstr) }                  \
 577                 .stab.index 0 : { *(.stab.index) }                      \
 578                 .stab.indexstr 0 : { *(.stab.indexstr) }                \
 579                 .comment 0 : { *(.comment) }
 580
 581 #ifdef CONFIG_GENERIC_BUG
 582 #define BUG_TABLE                                                       \
 583         . = ALIGN(8);                                                   \
 584         __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {             \
 585                 VMLINUX_SYMBOL(__start___bug_table) = .;                \
 586                 *(__bug_table)                                          \
 587                 VMLINUX_SYMBOL(__stop___bug_table) = .;                 \
 588         }
 589 #else
 590 #define BUG_TABLE
 591 #endif
 592
 593 #ifdef CONFIG_PM_TRACE
 594 #define TRACEDATA                                                       \
 595         . = ALIGN(4);                                                   \
 596         .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {               \
 597                 VMLINUX_SYMBOL(__tracedata_start) = .;                  \
 598                 *(.tracedata)                                           \
 599                 VMLINUX_SYMBOL(__tracedata_end) = .;                    \
 600         }
 601 #else
 602 #define TRACEDATA
 603 #endif
 604
 605 #define NOTES                                                           \
 606         .notes : AT(ADDR(.notes) - LOAD_OFFSET) {                       \
 607                 VMLINUX_SYMBOL(__start_notes) = .;                      \
 608                 *(.note.*)                                              \
 609                 VMLINUX_SYMBOL(__stop_notes) = .;                       \
 610         }
 611
 612 #define INIT_SETUP(initsetup_align)                                     \
 613                 . = ALIGN(initsetup_align);                             \
 614                 VMLINUX_SYMBOL(__setup_start) = .;                      \
 615                 *(.init.setup)                                          \
 616                 VMLINUX_SYMBOL(__setup_end) = .;
 617
 618 #define INITCALLS                                                       \
 619         *(.initcallearly.init)                                          \
 620         VMLINUX_SYMBOL(__early_initcall_end) = .;                       \
 621         *(.initcall0.init)                                              \
 622         *(.initcall0s.init)                                             \
 623         *(.initcall1.init)                                              \
 624         *(.initcall1s.init)                                             \
 625         *(.initcall2.init)                                              \
 626         *(.initcall2s.init)                                             \
 627         *(.initcall3.init)                                              \
 628         *(.initcall3s.init)                                             \
 629         *(.initcall4.init)                                              \
 630         *(.initcall4s.init)                                             \
 631         *(.initcall5.init)                                              \
 632         *(.initcall5s.init)                                             \
 633         *(.initcallrootfs.init)                                         \
 634         *(.initcall6.init)                                              \
 635         *(.initcall6s.init)                                             \
 636         *(.initcall7.init)                                              \
 637         *(.initcall7s.init)
 638
 639 #define INIT_CALLS                                                      \
 640                 VMLINUX_SYMBOL(__initcall_start) = .;                   \
 641                 INITCALLS                                               \
 642                 VMLINUX_SYMBOL(__initcall_end) = .;
 643
 644 #define CON_INITCALL                                                    \
 645                 VMLINUX_SYMBOL(__con_initcall_start) = .;               \
 646                 *(.con_initcall.init)                                   \
 647                 VMLINUX_SYMBOL(__con_initcall_end) = .;
 648
 649 #define SECURITY_INITCALL                                               \
 650                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 651                 *(.security_initcall.init)                              \
 652                 VMLINUX_SYMBOL(__security_initcall_end) = .;
 653
 654 #ifdef CONFIG_BLK_DEV_INITRD
 655 #define INIT_RAM_FS                                                     \
 656         . = ALIGN(4);                                                   \
 657         VMLINUX_SYMBOL(__initramfs_start) = .;                          \
 658         *(.init.ramfs)                                                  \
 659         . = ALIGN(8);                                                   \
 660         *(.init.ramfs.info)
 661 #else
 662 #define INIT_RAM_FS
 663 #endif
 664
 665 /*
 666  * Default discarded sections.
 667  *
 668  * Some archs want to discard exit text/data at runtime rather than
 669  * link time due to cross-section references such as alt instructions,
 670  * bug table, eh_frame, etc.  DISCARDS must be the last of output
 671  * section definitions so that such archs put those in earlier section
 672  * definitions.
 673  */
 674 #define DISCARDS                                                        \
 675         /DISCARD/ : {                                                   \
 676         EXIT_TEXT                                                       \
 677         EXIT_DATA                                                       \
 678         EXIT_CALL                                                       \
 679         *(.discard)                                                     \
 680         *(.discard.*)                                                   \
 681         }
 682
 683 /**
 684  * PERCPU_INPUT - the percpu input sections
 685  * @cacheline: cacheline size
 686  *
 687  * The core percpu section names and core symbols which do not rely
 688  * directly upon load addresses.
 689  *
 690  * @cacheline is used to align subsections to avoid false cacheline
 691  * sharing between subsections for different purposes.
 692  */
 693 #define PERCPU_INPUT(cacheline)                                         \
 694         VMLINUX_SYMBOL(__per_cpu_start) = .;                            \
 695         VMLINUX_SYMBOL(__per_cpu_user_mapped_start) = .;                \
 696         *(.data..percpu..first)                                         \
 697         . = ALIGN(cacheline);                                           \
 698         *(.data..percpu..user_mapped)                                   \
 699         *(.data..percpu..user_mapped..shared_aligned)                   \
 700         . = ALIGN(PAGE_SIZE);                                           \
 701         *(.data..percpu..user_mapped..page_aligned)                     \
 702         VMLINUX_SYMBOL(__per_cpu_user_mapped_end) = .;                  \
 703         . = ALIGN(PAGE_SIZE);                                           \
 704         *(.data..percpu..page_aligned)                                  \
 705         . = ALIGN(cacheline);                                           \
 706         *(.data..percpu..readmostly)                                    \
 707         . = ALIGN(cacheline);                                           \
 708         *(.data..percpu)                                                \
 709         *(.data..percpu..shared_aligned)                                \
 710         VMLINUX_SYMBOL(__per_cpu_end) = .;
 711
 712 /**
 713  * PERCPU_VADDR - define output section for percpu area
 714  * @cacheline: cacheline size
 715  * @vaddr: explicit base address (optional)
 716  * @phdr: destination PHDR (optional)
 717  *
 718  * Macro which expands to output section for percpu area.
 719  *
 720  * @cacheline is used to align subsections to avoid false cacheline
 721  * sharing between subsections for different purposes.
 722  *
 723  * If @vaddr is not blank, it specifies explicit base address and all
 724  * percpu symbols will be offset from the given address.  If blank,
 725  * @vaddr always equals @laddr + LOAD_OFFSET.
 726  *
 727  * @phdr defines the output PHDR to use if not blank.  Be warned that
 728  * output PHDR is sticky.  If @phdr is specified, the next output
 729  * section in the linker script will go there too.  @phdr should have
 730  * a leading colon.
 731  *
 732  * Note that this macros defines __per_cpu_load as an absolute symbol.
 733  * If there is no need to put the percpu section at a predetermined
 734  * address, use PERCPU_SECTION.
 735  */
 736 #define PERCPU_VADDR(cacheline, vaddr, phdr)                            \
 737         VMLINUX_SYMBOL(__per_cpu_load) = .;                             \
 738         .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load)         \
 739                                 - LOAD_OFFSET) {                        \
 740                 PERCPU_INPUT(cacheline)                                 \
 741         } phdr                                                          \
 742         . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
 743
 744 /**
 745  * PERCPU_SECTION - define output section for percpu area, simple version
 746  * @cacheline: cacheline size
 747  *
 748  * Align to PAGE_SIZE and outputs output section for percpu area.  This
 749  * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
 750  * __per_cpu_start will be identical.
 751  *
 752  * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
 753  * except that __per_cpu_load is defined as a relative symbol against
 754  * .data..percpu which is required for relocatable x86_32 configuration.
 755  */
 756 #define PERCPU_SECTION(cacheline)                                       \
 757         . = ALIGN(PAGE_SIZE);                                           \
 758         .data..percpu   : AT(ADDR(.data..percpu) - LOAD_OFFSET) {       \
 759                 VMLINUX_SYMBOL(__per_cpu_load) = .;                     \
 760                 PERCPU_INPUT(cacheline)                                 \
 761         }
 762
 763
 764 /*
 765  * Definition of the high level *_SECTION macros
 766  * They will fit only a subset of the architectures
 767  */
 768
 769
 770 /*
 771  * Writeable data.
 772  * All sections are combined in a single .data section.
 773  * The sections following CONSTRUCTORS are arranged so their
 774  * typical alignment matches.
 775  * A cacheline is typical/always less than a PAGE_SIZE so
 776  * the sections that has this restriction (or similar)
 777  * is located before the ones requiring PAGE_SIZE alignment.
 778  * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
 779  * matches the requirement of PAGE_ALIGNED_DATA.
 780  *
 781  * use 0 as page_align if page_aligned data is not used */
 782 #define RW_DATA_SECTION(cacheline, pagealigned, inittask)               \
 783         . = ALIGN(PAGE_SIZE);                                           \
 784         .data : AT(ADDR(.data) - LOAD_OFFSET) {                         \
 785                 INIT_TASK_DATA(inittask)                                \
 786                 NOSAVE_DATA                                             \
 787                 PAGE_ALIGNED_DATA(pagealigned)                          \
 788                 CACHELINE_ALIGNED_DATA(cacheline)                       \
 789                 READ_MOSTLY_DATA(cacheline)                             \
 790                 DATA_DATA                                               \
 791                 CONSTRUCTORS                                            \
 792         }
 793
 794 #define INIT_TEXT_SECTION(inittext_align)                               \
 795         . = ALIGN(inittext_align);                                      \
 796         .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {               \
 797                 VMLINUX_SYMBOL(_sinittext) = .;                         \
 798                 INIT_TEXT                                               \
 799                 VMLINUX_SYMBOL(_einittext) = .;                         \
 800         }
 801
 802 #define INIT_DATA_SECTION(initsetup_align)                              \
 803         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {               \
 804                 INIT_DATA                                               \
 805                 INIT_SETUP(initsetup_align)                             \
 806                 INIT_CALLS                                              \
 807                 CON_INITCALL                                            \
 808                 SECURITY_INITCALL                                       \
 809                 INIT_RAM_FS                                             \
 810         }
 811
 812 #define BSS_SECTION(sbss_align, bss_align, stop_align)                  \
 813         . = ALIGN(sbss_align);                                          \
 814         VMLINUX_SYMBOL(__bss_start) = .;                                \
 815         SBSS(sbss_align)                                                \
 816         BSS(bss_align)                                                  \
 817         . = ALIGN(stop_align);                                          \
 818         VMLINUX_SYMBOL(__bss_stop) = .;