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 #include <linux/export.h>
  56
  57 /* Align . to a 8 byte boundary equals to maximum function alignment. */
  58 #define ALIGN_FUNCTION()  . = ALIGN(8)
  59
  60 /*
  61  * Align to a 32 byte boundary equal to the
  62  * alignment gcc 4.5 uses for a struct
  63  */
  64 #define STRUCT_ALIGNMENT 32
  65 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
  66
  67 /* The actual configuration determine if the init/exit sections
  68  * are handled as text/data or they can be discarded (which
  69  * often happens at runtime)
  70  */
  71 #ifdef CONFIG_HOTPLUG
  72 #define DEV_KEEP(sec)    *(.dev##sec)
  73 #define DEV_DISCARD(sec)
  74 #else
  75 #define DEV_KEEP(sec)
  76 #define DEV_DISCARD(sec) *(.dev##sec)
  77 #endif
  78
  79 #ifdef CONFIG_HOTPLUG_CPU
  80 #define CPU_KEEP(sec)    *(.cpu##sec)
  81 #define CPU_DISCARD(sec)
  82 #else
  83 #define CPU_KEEP(sec)
  84 #define CPU_DISCARD(sec) *(.cpu##sec)
  85 #endif
  86
  87 #if defined(CONFIG_MEMORY_HOTPLUG)
  88 #define MEM_KEEP(sec)    *(.mem##sec)
  89 #define MEM_DISCARD(sec)
  90 #else
  91 #define MEM_KEEP(sec)
  92 #define MEM_DISCARD(sec) *(.mem##sec)
  93 #endif
  94
  95 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
  96 #define MCOUNT_REC()    . = ALIGN(8);                           \
  97                         VMLINUX_SYMBOL(__start_mcount_loc) = .; \
  98                         *(__mcount_loc)                         \
  99                         VMLINUX_SYMBOL(__stop_mcount_loc) = .;
 100 #else
 101 #define MCOUNT_REC()
 102 #endif
 103
 104 #ifdef CONFIG_TRACE_BRANCH_PROFILING
 105 #define LIKELY_PROFILE()        VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \
 106                                 *(_ftrace_annotated_branch)                           \
 107                                 VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .;
 108 #else
 109 #define LIKELY_PROFILE()
 110 #endif
 111
 112 #ifdef CONFIG_PROFILE_ALL_BRANCHES
 113 #define BRANCH_PROFILE()        VMLINUX_SYMBOL(__start_branch_profile) = .;   \
 114                                 *(_ftrace_branch)                             \
 115                                 VMLINUX_SYMBOL(__stop_branch_profile) = .;
 116 #else
 117 #define BRANCH_PROFILE()
 118 #endif
 119
 120 #ifdef CONFIG_EVENT_TRACING
 121 #define FTRACE_EVENTS() . = ALIGN(8);                                   \
 122                         VMLINUX_SYMBOL(__start_ftrace_events) = .;      \
 123                         *(_ftrace_events)                               \
 124                         VMLINUX_SYMBOL(__stop_ftrace_events) = .;
 125 #else
 126 #define FTRACE_EVENTS()
 127 #endif
 128
 129 #ifdef CONFIG_TRACING
 130 #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .;      \
 131                          *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \
 132                          VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;
 133 #else
 134 #define TRACE_PRINTKS()
 135 #endif
 136
 137 #ifdef CONFIG_FTRACE_SYSCALLS
 138 #define TRACE_SYSCALLS() . = ALIGN(8);                                  \
 139                          VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \
 140                          *(__syscalls_metadata)                         \
 141                          VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
 142 #else
 143 #define TRACE_SYSCALLS()
 144 #endif
 145
 146 #ifdef CONFIG_CLKSRC_OF
 147 #define CLKSRC_OF_TABLES() . = ALIGN(8);                                \
 148                            VMLINUX_SYMBOL(__clksrc_of_table) = .;       \
 149                            *(__clksrc_of_table)                         \
 150                            *(__clksrc_of_table_end)
 151 #else
 152 #define CLKSRC_OF_TABLES()
 153 #endif
 154
 155 #ifdef CONFIG_IRQCHIP
 156 #define IRQCHIP_OF_MATCH_TABLE()                                        \
 157         . = ALIGN(8);                                                   \
 158         VMLINUX_SYMBOL(__irqchip_begin) = .;                            \
 159         *(__irqchip_of_table)                                           \
 160         *(__irqchip_of_end)
 161 #else
 162 #define IRQCHIP_OF_MATCH_TABLE()
 163 #endif
 164
 165 #ifdef CONFIG_COMMON_CLK
 166 #define CLK_OF_TABLES() . = ALIGN(8);                           \
 167                         VMLINUX_SYMBOL(__clk_of_table) = .;     \
 168                         *(__clk_of_table)                       \
 169                         *(__clk_of_table_end)
 170 #else
 171 #define CLK_OF_TABLES()
 172 #endif
 173
 174 #ifdef CONFIG_OF_RESERVED_MEM
 175 #define RESERVEDMEM_OF_TABLES()                         \
 176         . = ALIGN(8);                                   \
 177         VMLINUX_SYMBOL(__reservedmem_of_table) = .;     \
 178         *(__reservedmem_of_table)                       \
 179         *(__reservedmem_of_table_end)
 180 #else
 181 #define RESERVEDMEM_OF_TABLES()
 182 #endif
 183
 184 #define KERNEL_DTB()                                                    \
 185         STRUCT_ALIGN();                                                 \
 186         VMLINUX_SYMBOL(__dtb_start) = .;                                \
 187         *(.dtb.init.rodata)                                             \
 188         VMLINUX_SYMBOL(__dtb_end) = .;
 189
 190 /* .data section */
 191 #define DATA_DATA                                                       \
 192         *(.data)                                                        \
 193         *(.ref.data)                                                    \
 194         *(.data..shared_aligned) /* percpu related */                   \
 195         DEV_KEEP(init.data)                                             \
 196         DEV_KEEP(exit.data)                                             \
 197         CPU_KEEP(init.data)                                             \
 198         CPU_KEEP(exit.data)                                             \
 199         MEM_KEEP(init.data)                                             \
 200         MEM_KEEP(exit.data)                                             \
 201         *(.data.unlikely)                                               \
 202         STRUCT_ALIGN();                                                 \
 203         *(__tracepoints)                                                \
 204         /* implement dynamic printk debug */                            \
 205         . = ALIGN(8);                                                   \
 206         VMLINUX_SYMBOL(__start___jump_table) = .;                       \
 207         *(__jump_table)                                                 \
 208         VMLINUX_SYMBOL(__stop___jump_table) = .;                        \
 209         . = ALIGN(8);                                                   \
 210         VMLINUX_SYMBOL(__start___verbose) = .;                          \
 211         *(__verbose)                                                    \
 212         VMLINUX_SYMBOL(__stop___verbose) = .;                           \
 213         LIKELY_PROFILE()                                                \
 214         BRANCH_PROFILE()                                                \
 215         TRACE_PRINTKS()
 216
 217 /*
 218  * Data section helpers
 219  */
 220 #define NOSAVE_DATA                                                     \
 221         . = ALIGN(PAGE_SIZE);                                           \
 222         VMLINUX_SYMBOL(__nosave_begin) = .;                             \
 223         *(.data..nosave)                                                \
 224         . = ALIGN(PAGE_SIZE);                                           \
 225         VMLINUX_SYMBOL(__nosave_end) = .;
 226
 227 #define PAGE_ALIGNED_DATA(page_align)                                   \
 228         . = ALIGN(page_align);                                          \
 229         *(.data..page_aligned)
 230
 231 #define READ_MOSTLY_DATA(align)                                         \
 232         . = ALIGN(align);                                               \
 233         *(.data..read_mostly)                                           \
 234         . = ALIGN(align);
 235
 236 #define CACHELINE_ALIGNED_DATA(align)                                   \
 237         . = ALIGN(align);                                               \
 238         *(.data..cacheline_aligned)
 239
 240 #define INIT_TASK_DATA(align)                                           \
 241         . = ALIGN(align);                                               \
 242         *(.data..init_task)
 243
 244 /*
 245  * Read only Data
 246  */
 247 #define RO_DATA_SECTION(align)                                          \
 248         . = ALIGN((align));                                             \
 249         .rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {           \
 250                 VMLINUX_SYMBOL(__start_rodata) = .;                     \
 251                 *(.rodata) *(.rodata.*)                                 \
 252                 *(__vermagic)           /* Kernel version magic */      \
 253                 . = ALIGN(8);                                           \
 254                 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .;         \
 255                 *(__tracepoints_ptrs)   /* Tracepoints: pointer array */\
 256                 VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .;          \
 257                 *(__tracepoints_strings)/* Tracepoints: strings */      \
 258         }                                                               \
 259                                                                         \
 260         .rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {          \
 261                 *(.rodata1)                                             \
 262         }                                                               \
 263                                                                         \
 264         BUG_TABLE                                                       \
 265                                                                         \
 266         /* PCI quirks */                                                \
 267         .pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {        \
 268                 VMLINUX_SYMBOL(__start_pci_fixups_early) = .;           \
 269                 *(.pci_fixup_early)                                     \
 270                 VMLINUX_SYMBOL(__end_pci_fixups_early) = .;             \
 271                 VMLINUX_SYMBOL(__start_pci_fixups_header) = .;          \
 272                 *(.pci_fixup_header)                                    \
 273                 VMLINUX_SYMBOL(__end_pci_fixups_header) = .;            \
 274                 VMLINUX_SYMBOL(__start_pci_fixups_final) = .;           \
 275                 *(.pci_fixup_final)                                     \
 276                 VMLINUX_SYMBOL(__end_pci_fixups_final) = .;             \
 277                 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .;          \
 278                 *(.pci_fixup_enable)                                    \
 279                 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .;            \
 280                 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .;          \
 281                 *(.pci_fixup_resume)                                    \
 282                 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .;            \
 283                 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .;    \
 284                 *(.pci_fixup_resume_early)                              \
 285                 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .;      \
 286                 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .;         \
 287                 *(.pci_fixup_suspend)                                   \
 288                 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .;           \
 289         }                                                               \
 290                                                                         \
 291         /* Built-in firmware blobs */                                   \
 292         .builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {      \
 293                 VMLINUX_SYMBOL(__start_builtin_fw) = .;                 \
 294                 *(.builtin_fw)                                          \
 295                 VMLINUX_SYMBOL(__end_builtin_fw) = .;                   \
 296         }                                                               \
 297                                                                         \
 298         /* RapidIO route ops */                                         \
 299         .rio_ops        : AT(ADDR(.rio_ops) - LOAD_OFFSET) {            \
 300                 VMLINUX_SYMBOL(__start_rio_switch_ops) = .;             \
 301                 *(.rio_switch_ops)                                      \
 302                 VMLINUX_SYMBOL(__end_rio_switch_ops) = .;               \
 303         }                                                               \
 304                                                                         \
 305         TRACEDATA                                                       \
 306                                                                         \
 307         /* Kernel symbol table: Normal symbols */                       \
 308         __ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {         \
 309                 VMLINUX_SYMBOL(__start___ksymtab) = .;                  \
 310                 *(SORT(___ksymtab+*))                                   \
 311                 VMLINUX_SYMBOL(__stop___ksymtab) = .;                   \
 312         }                                                               \
 313                                                                         \
 314         /* Kernel symbol table: GPL-only symbols */                     \
 315         __ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {     \
 316                 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .;              \
 317                 *(SORT(___ksymtab_gpl+*))                               \
 318                 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .;               \
 319         }                                                               \
 320                                                                         \
 321         /* Kernel symbol table: Normal unused symbols */                \
 322         __ksymtab_unused  : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) {  \
 323                 VMLINUX_SYMBOL(__start___ksymtab_unused) = .;           \
 324                 *(SORT(___ksymtab_unused+*))                            \
 325                 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .;            \
 326         }                                                               \
 327                                                                         \
 328         /* Kernel symbol table: GPL-only unused symbols */              \
 329         __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
 330                 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .;       \
 331                 *(SORT(___ksymtab_unused_gpl+*))                        \
 332                 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .;        \
 333         }                                                               \
 334                                                                         \
 335         /* Kernel symbol table: GPL-future-only symbols */              \
 336         __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
 337                 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .;       \
 338                 *(SORT(___ksymtab_gpl_future+*))                        \
 339                 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .;        \
 340         }                                                               \
 341                                                                         \
 342         /* Kernel symbol table: Normal symbols */                       \
 343         __kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {         \
 344                 VMLINUX_SYMBOL(__start___kcrctab) = .;                  \
 345                 *(SORT(___kcrctab+*))                                   \
 346                 VMLINUX_SYMBOL(__stop___kcrctab) = .;                   \
 347         }                                                               \
 348                                                                         \
 349         /* Kernel symbol table: GPL-only symbols */                     \
 350         __kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {     \
 351                 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .;              \
 352                 *(SORT(___kcrctab_gpl+*))                               \
 353                 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .;               \
 354         }                                                               \
 355                                                                         \
 356         /* Kernel symbol table: Normal unused symbols */                \
 357         __kcrctab_unused  : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) {  \
 358                 VMLINUX_SYMBOL(__start___kcrctab_unused) = .;           \
 359                 *(SORT(___kcrctab_unused+*))                            \
 360                 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .;            \
 361         }                                                               \
 362                                                                         \
 363         /* Kernel symbol table: GPL-only unused symbols */              \
 364         __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
 365                 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .;       \
 366                 *(SORT(___kcrctab_unused_gpl+*))                        \
 367                 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .;        \
 368         }                                                               \
 369                                                                         \
 370         /* Kernel symbol table: GPL-future-only symbols */              \
 371         __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
 372                 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .;       \
 373                 *(SORT(___kcrctab_gpl_future+*))                        \
 374                 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .;        \
 375         }                                                               \
 376                                                                         \
 377         /* Kernel symbol table: strings */                              \
 378         __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
 379                 *(__ksymtab_strings)                                    \
 380         }                                                               \
 381                                                                         \
 382         /* __*init sections */                                          \
 383         __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {         \
 384                 *(.ref.rodata)                                          \
 385                 DEV_KEEP(init.rodata)                                   \
 386                 DEV_KEEP(exit.rodata)                                   \
 387                 CPU_KEEP(init.rodata)                                   \
 388                 CPU_KEEP(exit.rodata)                                   \
 389                 MEM_KEEP(init.rodata)                                   \
 390                 MEM_KEEP(exit.rodata)                                   \
 391         }                                                               \
 392                                                                         \
 393         /* Built-in module parameters. */                               \
 394         __param : AT(ADDR(__param) - LOAD_OFFSET) {                     \
 395                 VMLINUX_SYMBOL(__start___param) = .;                    \
 396                 *(__param)                                              \
 397                 VMLINUX_SYMBOL(__stop___param) = .;                     \
 398         }                                                               \
 399                                                                         \
 400         /* Built-in module versions. */                                 \
 401         __modver : AT(ADDR(__modver) - LOAD_OFFSET) {                   \
 402                 VMLINUX_SYMBOL(__start___modver) = .;                   \
 403                 *(__modver)                                             \
 404                 VMLINUX_SYMBOL(__stop___modver) = .;                    \
 405                 . = ALIGN((align));                                     \
 406                 VMLINUX_SYMBOL(__end_rodata) = .;                       \
 407         }                                                               \
 408         . = ALIGN((align));
 409
 410 /* RODATA & RO_DATA provided for backward compatibility.
 411  * All archs are supposed to use RO_DATA() */
 412 #define RODATA          RO_DATA_SECTION(4096)
 413 #define RO_DATA(align)  RO_DATA_SECTION(align)
 414
 415 #define SECURITY_INIT                                                   \
 416         .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
 417                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 418                 *(.security_initcall.init)                              \
 419                 VMLINUX_SYMBOL(__security_initcall_end) = .;            \
 420         }
 421
 422 /* .text section. Map to function alignment to avoid address changes
 423  * during second ld run in second ld pass when generating System.map */
 424 #define TEXT_TEXT                                                       \
 425                 ALIGN_FUNCTION();                                       \
 426                 *(.text.hot)                                            \
 427                 *(.text)                                                \
 428                 *(.ref.text)                                            \
 429         DEV_KEEP(init.text)                                             \
 430         DEV_KEEP(exit.text)                                             \
 431         CPU_KEEP(init.text)                                             \
 432         CPU_KEEP(exit.text)                                             \
 433         MEM_KEEP(init.text)                                             \
 434         MEM_KEEP(exit.text)                                             \
 435                 *(.text.unlikely)
 436
 437
 438 /* sched.text is aling to function alignment to secure we have same
 439  * address even at second ld pass when generating System.map */
 440 #define SCHED_TEXT                                                      \
 441                 ALIGN_FUNCTION();                                       \
 442                 VMLINUX_SYMBOL(__sched_text_start) = .;                 \
 443                 *(.sched.text)                                          \
 444                 VMLINUX_SYMBOL(__sched_text_end) = .;
 445
 446 /* spinlock.text is aling to function alignment to secure we have same
 447  * address even at second ld pass when generating System.map */
 448 #define LOCK_TEXT                                                       \
 449                 ALIGN_FUNCTION();                                       \
 450                 VMLINUX_SYMBOL(__lock_text_start) = .;                  \
 451                 *(.spinlock.text)                                       \
 452                 VMLINUX_SYMBOL(__lock_text_end) = .;
 453
 454 #define KPROBES_TEXT                                                    \
 455                 ALIGN_FUNCTION();                                       \
 456                 VMLINUX_SYMBOL(__kprobes_text_start) = .;               \
 457                 *(.kprobes.text)                                        \
 458                 VMLINUX_SYMBOL(__kprobes_text_end) = .;
 459
 460 #define ENTRY_TEXT                                                      \
 461                 ALIGN_FUNCTION();                                       \
 462                 VMLINUX_SYMBOL(__entry_text_start) = .;                 \
 463                 *(.entry.text)                                          \
 464                 VMLINUX_SYMBOL(__entry_text_end) = .;
 465
 466 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 467 #define IRQENTRY_TEXT                                                   \
 468                 ALIGN_FUNCTION();                                       \
 469                 VMLINUX_SYMBOL(__irqentry_text_start) = .;              \
 470                 *(.irqentry.text)                                       \
 471                 VMLINUX_SYMBOL(__irqentry_text_end) = .;
 472 #else
 473 #define IRQENTRY_TEXT
 474 #endif
 475
 476 /* Section used for early init (in .S files) */
 477 #define HEAD_TEXT  *(.head.text)
 478
 479 #define HEAD_TEXT_SECTION                                                       \
 480         .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {               \
 481                 HEAD_TEXT                                               \
 482         }
 483
 484 /*
 485  * Exception table
 486  */
 487 #define EXCEPTION_TABLE(align)                                          \
 488         . = ALIGN(align);                                               \
 489         __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {               \
 490                 VMLINUX_SYMBOL(__start___ex_table) = .;                 \
 491                 *(__ex_table)                                           \
 492                 VMLINUX_SYMBOL(__stop___ex_table) = .;                  \
 493         }
 494
 495 /*
 496  * Init task
 497  */
 498 #define INIT_TASK_DATA_SECTION(align)                                   \
 499         . = ALIGN(align);                                               \
 500         .data..init_task :  AT(ADDR(.data..init_task) - LOAD_OFFSET) {  \
 501                 INIT_TASK_DATA(align)                                   \
 502         }
 503
 504 #ifdef CONFIG_CONSTRUCTORS
 505 #define KERNEL_CTORS()  . = ALIGN(8);                      \
 506                         VMLINUX_SYMBOL(__ctors_start) = .; \
 507                         *(.ctors)                          \
 508                         *(.init_array)                     \
 509                         VMLINUX_SYMBOL(__ctors_end) = .;
 510 #else
 511 #define KERNEL_CTORS()
 512 #endif
 513
 514 /* init and exit section handling */
 515 #define INIT_DATA                                                       \
 516         *(.init.data)                                                   \
 517         DEV_DISCARD(init.data)                                          \
 518         CPU_DISCARD(init.data)                                          \
 519         MEM_DISCARD(init.data)                                          \
 520         KERNEL_CTORS()                                                  \
 521         MCOUNT_REC()                                                    \
 522         *(.init.rodata)                                                 \
 523         FTRACE_EVENTS()                                                 \
 524         TRACE_SYSCALLS()                                                \
 525         DEV_DISCARD(init.rodata)                                        \
 526         CPU_DISCARD(init.rodata)                                        \
 527         MEM_DISCARD(init.rodata)                                        \
 528         CLK_OF_TABLES()                                                 \
 529         RESERVEDMEM_OF_TABLES()                                         \
 530         CLKSRC_OF_TABLES()                                              \
 531         KERNEL_DTB()                                                    \
 532         IRQCHIP_OF_MATCH_TABLE()
 533
 534 #define INIT_TEXT                                                       \
 535         *(.init.text)                                                   \
 536         DEV_DISCARD(init.text)                                          \
 537         CPU_DISCARD(init.text)                                          \
 538         MEM_DISCARD(init.text)
 539
 540 #define EXIT_DATA                                                       \
 541         *(.exit.data)                                                   \
 542         DEV_DISCARD(exit.data)                                          \
 543         DEV_DISCARD(exit.rodata)                                        \
 544         CPU_DISCARD(exit.data)                                          \
 545         CPU_DISCARD(exit.rodata)                                        \
 546         MEM_DISCARD(exit.data)                                          \
 547         MEM_DISCARD(exit.rodata)
 548
 549 #define EXIT_TEXT                                                       \
 550         *(.exit.text)                                                   \
 551         DEV_DISCARD(exit.text)                                          \
 552         CPU_DISCARD(exit.text)                                          \
 553         MEM_DISCARD(exit.text)
 554
 555 #define EXIT_CALL                                                       \
 556         *(.exitcall.exit)
 557
 558 /*
 559  * bss (Block Started by Symbol) - uninitialized data
 560  * zeroed during startup
 561  */
 562 #define SBSS(sbss_align)                                                \
 563         . = ALIGN(sbss_align);                                          \
 564         .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {                         \
 565                 *(.sbss)                                                \
 566                 *(.scommon)                                             \
 567         }
 568
 569 /*
 570  * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
 571  * sections to the front of bss.
 572  */
 573 #ifndef BSS_FIRST_SECTIONS
 574 #define BSS_FIRST_SECTIONS
 575 #endif
 576
 577 #define BSS(bss_align)                                                  \
 578         . = ALIGN(bss_align);                                           \
 579         .bss : AT(ADDR(.bss) - LOAD_OFFSET) {                           \
 580                 BSS_FIRST_SECTIONS                                      \
 581                 *(.bss..page_aligned)                                   \
 582                 *(.dynbss)                                              \
 583                 *(.bss)                                                 \
 584                 *(COMMON)                                               \
 585         }
 586
 587 /*
 588  * DWARF debug sections.
 589  * Symbols in the DWARF debugging sections are relative to
 590  * the beginning of the section so we begin them at 0.
 591  */
 592 #define DWARF_DEBUG                                                     \
 593                 /* DWARF 1 */                                           \
 594                 .debug          0 : { *(.debug) }                       \
 595                 .line           0 : { *(.line) }                        \
 596                 /* GNU DWARF 1 extensions */                            \
 597                 .debug_srcinfo  0 : { *(.debug_srcinfo) }               \
 598                 .debug_sfnames  0 : { *(.debug_sfnames) }               \
 599                 /* DWARF 1.1 and DWARF 2 */                             \
 600                 .debug_aranges  0 : { *(.debug_aranges) }               \
 601                 .debug_pubnames 0 : { *(.debug_pubnames) }              \
 602                 /* DWARF 2 */                                           \
 603                 .debug_info     0 : { *(.debug_info                     \
 604                                 .gnu.linkonce.wi.*) }                   \
 605                 .debug_abbrev   0 : { *(.debug_abbrev) }                \
 606                 .debug_line     0 : { *(.debug_line) }                  \
 607                 .debug_frame    0 : { *(.debug_frame) }                 \
 608                 .debug_str      0 : { *(.debug_str) }                   \
 609                 .debug_loc      0 : { *(.debug_loc) }                   \
 610                 .debug_macinfo  0 : { *(.debug_macinfo) }               \
 611                 /* SGI/MIPS DWARF 2 extensions */                       \
 612                 .debug_weaknames 0 : { *(.debug_weaknames) }            \
 613                 .debug_funcnames 0 : { *(.debug_funcnames) }            \
 614                 .debug_typenames 0 : { *(.debug_typenames) }            \
 615                 .debug_varnames  0 : { *(.debug_varnames) }             \
 616
 617                 /* Stabs debugging sections.  */
 618 #define STABS_DEBUG                                                     \
 619                 .stab 0 : { *(.stab) }                                  \
 620                 .stabstr 0 : { *(.stabstr) }                            \
 621                 .stab.excl 0 : { *(.stab.excl) }                        \
 622                 .stab.exclstr 0 : { *(.stab.exclstr) }                  \
 623                 .stab.index 0 : { *(.stab.index) }                      \
 624                 .stab.indexstr 0 : { *(.stab.indexstr) }                \
 625                 .comment 0 : { *(.comment) }
 626
 627 #ifdef CONFIG_GENERIC_BUG
 628 #define BUG_TABLE                                                       \
 629         . = ALIGN(8);                                                   \
 630         __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {             \
 631                 VMLINUX_SYMBOL(__start___bug_table) = .;                \
 632                 *(__bug_table)                                          \
 633                 VMLINUX_SYMBOL(__stop___bug_table) = .;                 \
 634         }
 635 #else
 636 #define BUG_TABLE
 637 #endif
 638
 639 #ifdef CONFIG_PM_TRACE
 640 #define TRACEDATA                                                       \
 641         . = ALIGN(4);                                                   \
 642         .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {               \
 643                 VMLINUX_SYMBOL(__tracedata_start) = .;                  \
 644                 *(.tracedata)                                           \
 645                 VMLINUX_SYMBOL(__tracedata_end) = .;                    \
 646         }
 647 #else
 648 #define TRACEDATA
 649 #endif
 650
 651 #define NOTES                                                           \
 652         .notes : AT(ADDR(.notes) - LOAD_OFFSET) {                       \
 653                 VMLINUX_SYMBOL(__start_notes) = .;                      \
 654                 *(.note.*)                                              \
 655                 VMLINUX_SYMBOL(__stop_notes) = .;                       \
 656         }
 657
 658 #define INIT_SETUP(initsetup_align)                                     \
 659                 . = ALIGN(initsetup_align);                             \
 660                 VMLINUX_SYMBOL(__setup_start) = .;                      \
 661                 *(.init.setup)                                          \
 662                 VMLINUX_SYMBOL(__setup_end) = .;
 663
 664 #define INIT_CALLS_LEVEL(level)                                         \
 665                 VMLINUX_SYMBOL(__initcall##level##_start) = .;          \
 666                 *(.initcall##level##.init)                              \
 667                 *(.initcall##level##s.init)                             \
 668
 669 #define INIT_CALLS                                                      \
 670                 VMLINUX_SYMBOL(__initcall_start) = .;                   \
 671                 *(.initcallearly.init)                                  \
 672                 INIT_CALLS_LEVEL(0)                                     \
 673                 INIT_CALLS_LEVEL(1)                                     \
 674                 INIT_CALLS_LEVEL(2)                                     \
 675                 INIT_CALLS_LEVEL(3)                                     \
 676                 INIT_CALLS_LEVEL(4)                                     \
 677                 INIT_CALLS_LEVEL(5)                                     \
 678                 INIT_CALLS_LEVEL(rootfs)                                \
 679                 INIT_CALLS_LEVEL(6)                                     \
 680                 INIT_CALLS_LEVEL(7)                                     \
 681                 VMLINUX_SYMBOL(__initcall_end) = .;
 682
 683 #define CON_INITCALL                                                    \
 684                 VMLINUX_SYMBOL(__con_initcall_start) = .;               \
 685                 *(.con_initcall.init)                                   \
 686                 VMLINUX_SYMBOL(__con_initcall_end) = .;
 687
 688 #define SECURITY_INITCALL                                               \
 689                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 690                 *(.security_initcall.init)                              \
 691                 VMLINUX_SYMBOL(__security_initcall_end) = .;
 692
 693 #ifdef CONFIG_BLK_DEV_INITRD
 694 #define INIT_RAM_FS                                                     \
 695         . = ALIGN(4);                                                   \
 696         VMLINUX_SYMBOL(__initramfs_start) = .;                          \
 697         *(.init.ramfs)                                                  \
 698         . = ALIGN(8);                                                   \
 699         *(.init.ramfs.info)
 700 #else
 701 #define INIT_RAM_FS
 702 #endif
 703
 704 /*
 705  * Default discarded sections.
 706  *
 707  * Some archs want to discard exit text/data at runtime rather than
 708  * link time due to cross-section references such as alt instructions,
 709  * bug table, eh_frame, etc.  DISCARDS must be the last of output
 710  * section definitions so that such archs put those in earlier section
 711  * definitions.
 712  */
 713 #define DISCARDS                                                        \
 714         /DISCARD/ : {                                                   \
 715         EXIT_TEXT                                                       \
 716         EXIT_DATA                                                       \
 717         EXIT_CALL                                                       \
 718         *(.discard)                                                     \
 719         *(.discard.*)                                                   \
 720         }
 721
 722 /**
 723  * PERCPU_INPUT - the percpu input sections
 724  * @cacheline: cacheline size
 725  *
 726  * The core percpu section names and core symbols which do not rely
 727  * directly upon load addresses.
 728  *
 729  * @cacheline is used to align subsections to avoid false cacheline
 730  * sharing between subsections for different purposes.
 731  */
 732 #define PERCPU_INPUT(cacheline)                                         \
 733         VMLINUX_SYMBOL(__per_cpu_start) = .;                            \
 734         *(.data..percpu..first)                                         \
 735         . = ALIGN(PAGE_SIZE);                                           \
 736         *(.data..percpu..page_aligned)                                  \
 737         . = ALIGN(cacheline);                                           \
 738         *(.data..percpu..readmostly)                                    \
 739         . = ALIGN(cacheline);                                           \
 740         *(.data..percpu)                                                \
 741         *(.data..percpu..shared_aligned)                                \
 742         VMLINUX_SYMBOL(__per_cpu_end) = .;
 743
 744 /**
 745  * PERCPU_VADDR - define output section for percpu area
 746  * @cacheline: cacheline size
 747  * @vaddr: explicit base address (optional)
 748  * @phdr: destination PHDR (optional)
 749  *
 750  * Macro which expands to output section for percpu area.
 751  *
 752  * @cacheline is used to align subsections to avoid false cacheline
 753  * sharing between subsections for different purposes.
 754  *
 755  * If @vaddr is not blank, it specifies explicit base address and all
 756  * percpu symbols will be offset from the given address.  If blank,
 757  * @vaddr always equals @laddr + LOAD_OFFSET.
 758  *
 759  * @phdr defines the output PHDR to use if not blank.  Be warned that
 760  * output PHDR is sticky.  If @phdr is specified, the next output
 761  * section in the linker script will go there too.  @phdr should have
 762  * a leading colon.
 763  *
 764  * Note that this macros defines __per_cpu_load as an absolute symbol.
 765  * If there is no need to put the percpu section at a predetermined
 766  * address, use PERCPU_SECTION.
 767  */
 768 #define PERCPU_VADDR(cacheline, vaddr, phdr)                            \
 769         VMLINUX_SYMBOL(__per_cpu_load) = .;                             \
 770         .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load)         \
 771                                 - LOAD_OFFSET) {                        \
 772                 PERCPU_INPUT(cacheline)                                 \
 773         } phdr                                                          \
 774         . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
 775
 776 /**
 777  * PERCPU_SECTION - define output section for percpu area, simple version
 778  * @cacheline: cacheline size
 779  *
 780  * Align to PAGE_SIZE and outputs output section for percpu area.  This
 781  * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
 782  * __per_cpu_start will be identical.
 783  *
 784  * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
 785  * except that __per_cpu_load is defined as a relative symbol against
 786  * .data..percpu which is required for relocatable x86_32 configuration.
 787  */
 788 #define PERCPU_SECTION(cacheline)                                       \
 789         . = ALIGN(PAGE_SIZE);                                           \
 790         .data..percpu   : AT(ADDR(.data..percpu) - LOAD_OFFSET) {       \
 791                 VMLINUX_SYMBOL(__per_cpu_load) = .;                     \
 792                 PERCPU_INPUT(cacheline)                                 \
 793         }
 794
 795
 796 /*
 797  * Definition of the high level *_SECTION macros
 798  * They will fit only a subset of the architectures
 799  */
 800
 801
 802 /*
 803  * Writeable data.
 804  * All sections are combined in a single .data section.
 805  * The sections following CONSTRUCTORS are arranged so their
 806  * typical alignment matches.
 807  * A cacheline is typical/always less than a PAGE_SIZE so
 808  * the sections that has this restriction (or similar)
 809  * is located before the ones requiring PAGE_SIZE alignment.
 810  * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
 811  * matches the requirement of PAGE_ALIGNED_DATA.
 812  *
 813  * use 0 as page_align if page_aligned data is not used */
 814 #define RW_DATA_SECTION(cacheline, pagealigned, inittask)               \
 815         . = ALIGN(PAGE_SIZE);                                           \
 816         .data : AT(ADDR(.data) - LOAD_OFFSET) {                         \
 817                 INIT_TASK_DATA(inittask)                                \
 818                 NOSAVE_DATA                                             \
 819                 PAGE_ALIGNED_DATA(pagealigned)                          \
 820                 CACHELINE_ALIGNED_DATA(cacheline)                       \
 821                 READ_MOSTLY_DATA(cacheline)                             \
 822                 DATA_DATA                                               \
 823                 CONSTRUCTORS                                            \
 824         }
 825
 826 #define INIT_TEXT_SECTION(inittext_align)                               \
 827         . = ALIGN(inittext_align);                                      \
 828         .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {               \
 829                 VMLINUX_SYMBOL(_sinittext) = .;                         \
 830                 INIT_TEXT                                               \
 831                 VMLINUX_SYMBOL(_einittext) = .;                         \
 832         }
 833
 834 #define INIT_DATA_SECTION(initsetup_align)                              \
 835         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {               \
 836                 INIT_DATA                                               \
 837                 INIT_SETUP(initsetup_align)                             \
 838                 INIT_CALLS                                              \
 839                 CON_INITCALL                                            \
 840                 SECURITY_INITCALL                                       \
 841                 INIT_RAM_FS                                             \
 842         }
 843
 844 #define BSS_SECTION(sbss_align, bss_align, stop_align)                  \
 845         . = ALIGN(sbss_align);                                          \
 846         VMLINUX_SYMBOL(__bss_start) = .;                                \
 847         SBSS(sbss_align)                                                \
 848         BSS(bss_align)                                                  \
 849         . = ALIGN(stop_align);                                          \
 850         VMLINUX_SYMBOL(__bss_stop) = .;