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