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