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