include/asm-generic/vmlinux.lds.h

   1 /*
   2  * Helper macros to support writing architecture specific
   3  * linker scripts.
   4  *
   5  * A minimal linker scripts has following content:
   6  * [This is a sample, architectures may have special requiriements]
   7  *
   8  * OUTPUT_FORMAT(...)
   9  * OUTPUT_ARCH(...)
  10  * ENTRY(...)
  11  * SECTIONS
  12  * {
  13  *      . = START;
  14  *      __init_begin = .;
  15  *      HEAD_TEXT_SECTION
  16  *      INIT_TEXT_SECTION(PAGE_SIZE)
  17  *      INIT_DATA_SECTION(...)
  18  *      PERCPU_SECTION(CACHELINE_SIZE)
  19  *      __init_end = .;
  20  *
  21  *      _stext = .;
  22  *      TEXT_SECTION = 0
  23  *      _etext = .;
  24  *
  25  *      _sdata = .;
  26  *      RO_DATA_SECTION(PAGE_SIZE)
  27  *      RW_DATA_SECTION(...)
  28  *      _edata = .;
  29  *
  30  *      EXCEPTION_TABLE(...)
  31  *      NOTES
  32  *
  33  *      BSS_SECTION(0, 0, 0)
  34  *      _end = .;
  35  *
  36  *      STABS_DEBUG
  37  *      DWARF_DEBUG
  38  *
  39  *      DISCARDS                // must be the last
  40  * }
  41  *
  42  * [__init_begin, __init_end] is the init section that may be freed after init
  43  * [_stext, _etext] is the text section
  44  * [_sdata, _edata] is the data section
  45  *
  46  * Some of the included output section have their own set of constants.
  47  * Examples are: [__initramfs_start, __initramfs_end] for initramfs and
  48  *               [__nosave_begin, __nosave_end] for the nosave data
  49  */
  50
  51 #ifndef LOAD_OFFSET
  52 #define LOAD_OFFSET 0
  53 #endif
  54
  55 #ifndef SYMBOL_PREFIX
  56 #define VMLINUX_SYMBOL(sym) sym
  57 #else
  58 #define PASTE2(x,y) x##y
  59 #define PASTE(x,y) PASTE2(x,y)
  60 #define VMLINUX_SYMBOL(sym) PASTE(SYMBOL_PREFIX, sym)
  61 #endif
  62
  63 /* Align . to a 8 byte boundary equals to maximum function alignment. */
  64 #define ALIGN_FUNCTION()  . = ALIGN(8)
  65
  66 /*
  67  * Align to a 32 byte boundary equal to the
  68  * alignment gcc 4.5 uses for a struct
  69  */
  70 #define STRUCT_ALIGNMENT 32
  71 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
  72
  73 /* The actual configuration determine if the init/exit sections
  74  * are handled as text/data or they can be discarded (which
  75  * often happens at runtime)
  76  */
  77 #ifdef CONFIG_HOTPLUG
  78 #define DEV_KEEP(sec)    *(.dev##sec)
  79 #define DEV_DISCARD(sec)
  80 #else
  81 #define DEV_KEEP(sec)
  82 #define DEV_DISCARD(sec) *(.dev##sec)
  83 #endif
  84
  85 #ifdef CONFIG_HOTPLUG_CPU
  86 #define CPU_KEEP(sec)    *(.cpu##sec)
  87 #define CPU_DISCARD(sec)
  88 #else
  89 #define CPU_KEEP(sec)
  90 #define CPU_DISCARD(sec) *(.cpu##sec)
  91 #endif
  92
  93 #if defined(CONFIG_MEMORY_HOTPLUG)
  94 #define MEM_KEEP(sec)    *(.mem##sec)
  95 #define MEM_DISCARD(sec)
  96 #else
  97 #define MEM_KEEP(sec)
  98 #define MEM_DISCARD(sec) *(.mem##sec)
  99 #endif
 100
 101 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
 102 #define MCOUNT_REC()    . = ALIGN(8);                           \
 103                         VMLINUX_SYMBOL(__start_mcount_loc) = .; \
 104                         *(__mcount_loc)                         \
 105                         VMLINUX_SYMBOL(__stop_mcount_loc) = .;
 106 #else
 107 #define MCOUNT_REC()
 108 #endif
 109
 110 #ifdef CONFIG_TRACE_BRANCH_PROFILING
 111 #define LIKELY_PROFILE()        VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \
 112                                 *(_ftrace_annotated_branch)                           \
 113                                 VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .;
 114 #else
 115 #define LIKELY_PROFILE()
 116 #endif
 117
 118 #ifdef CONFIG_PROFILE_ALL_BRANCHES
 119 #define BRANCH_PROFILE()        VMLINUX_SYMBOL(__start_branch_profile) = .;   \
 120                                 *(_ftrace_branch)                             \
 121                                 VMLINUX_SYMBOL(__stop_branch_profile) = .;
 122 #else
 123 #define BRANCH_PROFILE()
 124 #endif
 125
 126 #ifdef CONFIG_EVENT_TRACING
 127 #define FTRACE_EVENTS() . = ALIGN(8);                                   \
 128                         VMLINUX_SYMBOL(__start_ftrace_events) = .;      \
 129                         *(_ftrace_events)                               \
 130                         VMLINUX_SYMBOL(__stop_ftrace_events) = .;
 131 #else
 132 #define FTRACE_EVENTS()
 133 #endif
 134
 135 #ifdef CONFIG_TRACING
 136 #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .;      \
 137                          *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \
 138                          VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;
 139 #else
 140 #define TRACE_PRINTKS()
 141 #endif
 142
 143 #ifdef CONFIG_FTRACE_SYSCALLS
 144 #define TRACE_SYSCALLS() . = ALIGN(8);                                  \
 145                          VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \
 146                          *(__syscalls_metadata)                         \
 147                          VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
 148 #else
 149 #define TRACE_SYSCALLS()
 150 #endif
 151
 152 #ifdef CONFIG_CLKSRC_OF
 153 #define CLKSRC_OF_TABLES() . = ALIGN(8);                                \
 154                            VMLINUX_SYMBOL(__clksrc_of_table) = .;       \
 155                            *(__clksrc_of_table)                         \
 156                            *(__clksrc_of_table_end)
 157 #else
 158 #define CLKSRC_OF_TABLES()
 159 #endif
 160
 161 #ifdef CONFIG_IRQCHIP
 162 #define IRQCHIP_OF_MATCH_TABLE()                                        \
 163         . = ALIGN(8);                                                   \
 164         VMLINUX_SYMBOL(__irqchip_begin) = .;                            \
 165         *(__irqchip_of_table)                                           \
 166         *(__irqchip_of_end)
 167 #else
 168 #define IRQCHIP_OF_MATCH_TABLE()
 169 #endif
 170
 171 #ifdef CONFIG_COMMON_CLK
 172 #define CLK_OF_TABLES() . = ALIGN(8);                           \
 173                         VMLINUX_SYMBOL(__clk_of_table) = .;     \
 174                         *(__clk_of_table)                       \
 175                         *(__clk_of_table_end)
 176 #else
 177 #define CLK_OF_TABLES()
 178 #endif
 179
 180 #define KERNEL_DTB()                                                    \
 181         STRUCT_ALIGN();                                                 \
 182         VMLINUX_SYMBOL(__dtb_start) = .;                                \
 183         *(.dtb.init.rodata)                                             \
 184         VMLINUX_SYMBOL(__dtb_end) = .;
 185
 186 /* .data section */
 187 #define DATA_DATA                                                       \
 188         *(.data)                                                        \
 189         *(.ref.data)                                                    \
 190         *(.data..shared_aligned) /* percpu related */                   \
 191         DEV_KEEP(init.data)                                             \
 192         DEV_KEEP(exit.data)                                             \
 193         CPU_KEEP(init.data)                                             \
 194         CPU_KEEP(exit.data)                                             \
 195         MEM_KEEP(init.data)                                             \
 196         MEM_KEEP(exit.data)                                             \
 197         *(.data.unlikely)                                               \
 198         STRUCT_ALIGN();                                                 \
 199         *(__tracepoints)                                                \
 200         /* implement dynamic printk debug */                            \
 201         . = ALIGN(8);                                                   \
 202         VMLINUX_SYMBOL(__start___jump_table) = .;                       \
 203         *(__jump_table)                                                 \
 204         VMLINUX_SYMBOL(__stop___jump_table) = .;                        \
 205         . = ALIGN(8);                                                   \
 206         VMLINUX_SYMBOL(__start___verbose) = .;                          \
 207         *(__verbose)                                                    \
 208         VMLINUX_SYMBOL(__stop___verbose) = .;                           \
 209         LIKELY_PROFILE()                                                \
 210         BRANCH_PROFILE()                                                \
 211         TRACE_PRINTKS()
 212
 213 /*
 214  * Data section helpers
 215  */
 216 #define NOSAVE_DATA                                                     \
 217         . = ALIGN(PAGE_SIZE);                                           \
 218         VMLINUX_SYMBOL(__nosave_begin) = .;                             \
 219         *(.data..nosave)                                                \
 220         . = ALIGN(PAGE_SIZE);                                           \
 221         VMLINUX_SYMBOL(__nosave_end) = .;
 222
 223 #define PAGE_ALIGNED_DATA(page_align)                                   \
 224         . = ALIGN(page_align);                                          \
 225         *(.data..page_aligned)
 226
 227 #define READ_MOSTLY_DATA(align)                                         \
 228         . = ALIGN(align);                                               \
 229         *(.data..read_mostly)                                           \
 230         . = ALIGN(align);
 231
 232 #define CACHELINE_ALIGNED_DATA(align)                                   \
 233         . = ALIGN(align);                                               \
 234         *(.data..cacheline_aligned)
 235
 236 #define INIT_TASK_DATA(align)                                           \
 237         . = ALIGN(align);                                               \
 238         *(.data..init_task)
 239
 240 /*
 241  * Read only Data
 242  */
 243 #define RO_DATA_SECTION(align)                                          \
 244         . = ALIGN((align));                                             \
 245         .rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {           \
 246                 VMLINUX_SYMBOL(__start_rodata) = .;                     \
 247                 *(.rodata) *(.rodata.*)                                 \
 248                 *(__vermagic)           /* Kernel version magic */      \
 249                 . = ALIGN(8);                                           \
 250                 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .;         \
 251                 *(__tracepoints_ptrs)   /* Tracepoints: pointer array */\
 252                 VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .;          \
 253                 *(__tracepoints_strings)/* Tracepoints: strings */      \
 254         }                                                               \
 255                                                                         \
 256         .rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {          \
 257                 *(.rodata1)                                             \
 258         }                                                               \
 259                                                                         \
 260         BUG_TABLE                                                       \
 261                                                                         \
 262         /* PCI quirks */                                                \
 263         .pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {        \
 264                 VMLINUX_SYMBOL(__start_pci_fixups_early) = .;           \
 265                 *(.pci_fixup_early)                                     \
 266                 VMLINUX_SYMBOL(__end_pci_fixups_early) = .;             \
 267                 VMLINUX_SYMBOL(__start_pci_fixups_header) = .;          \
 268                 *(.pci_fixup_header)                                    \
 269                 VMLINUX_SYMBOL(__end_pci_fixups_header) = .;            \
 270                 VMLINUX_SYMBOL(__start_pci_fixups_final) = .;           \
 271                 *(.pci_fixup_final)                                     \
 272                 VMLINUX_SYMBOL(__end_pci_fixups_final) = .;             \
 273                 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .;          \
 274                 *(.pci_fixup_enable)                                    \
 275                 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .;            \
 276                 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .;          \
 277                 *(.pci_fixup_resume)                                    \
 278                 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .;            \
 279                 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .;    \
 280                 *(.pci_fixup_resume_early)                              \
 281                 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .;      \
 282                 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .;         \
 283                 *(.pci_fixup_suspend)                                   \
 284                 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .;           \
 285         }                                                               \
 286                                                                         \
 287         /* Built-in firmware blobs */                                   \
 288         .builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {      \
 289                 VMLINUX_SYMBOL(__start_builtin_fw) = .;                 \
 290                 *(.builtin_fw)                                          \
 291                 VMLINUX_SYMBOL(__end_builtin_fw) = .;                   \
 292         }                                                               \
 293                                                                         \
 294         /* RapidIO route ops */                                         \
 295         .rio_ops        : AT(ADDR(.rio_ops) - LOAD_OFFSET) {            \
 296                 VMLINUX_SYMBOL(__start_rio_switch_ops) = .;             \
 297                 *(.rio_switch_ops)                                      \
 298                 VMLINUX_SYMBOL(__end_rio_switch_ops) = .;               \
 299         }                                                               \
 300                                                                         \
 301         TRACEDATA                                                       \
 302                                                                         \
 303         /* Kernel symbol table: Normal symbols */                       \
 304         __ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {         \
 305                 VMLINUX_SYMBOL(__start___ksymtab) = .;                  \
 306                 *(SORT(___ksymtab+*))                                   \
 307                 VMLINUX_SYMBOL(__stop___ksymtab) = .;                   \
 308         }                                                               \
 309                                                                         \
 310         /* Kernel symbol table: GPL-only symbols */                     \
 311         __ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {     \
 312                 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .;              \
 313                 *(SORT(___ksymtab_gpl+*))                               \
 314                 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .;               \
 315         }                                                               \
 316                                                                         \
 317         /* Kernel symbol table: Normal unused symbols */                \
 318         __ksymtab_unused  : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) {  \
 319                 VMLINUX_SYMBOL(__start___ksymtab_unused) = .;           \
 320                 *(SORT(___ksymtab_unused+*))                            \
 321                 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .;            \
 322         }                                                               \
 323                                                                         \
 324         /* Kernel symbol table: GPL-only unused symbols */              \
 325         __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
 326                 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .;       \
 327                 *(SORT(___ksymtab_unused_gpl+*))                        \
 328                 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .;        \
 329         }                                                               \
 330                                                                         \
 331         /* Kernel symbol table: GPL-future-only symbols */              \
 332         __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
 333                 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .;       \
 334                 *(SORT(___ksymtab_gpl_future+*))                        \
 335                 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .;        \
 336         }                                                               \
 337                                                                         \
 338         /* Kernel symbol table: Normal symbols */                       \
 339         __kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {         \
 340                 VMLINUX_SYMBOL(__start___kcrctab) = .;                  \
 341                 *(SORT(___kcrctab+*))                                   \
 342                 VMLINUX_SYMBOL(__stop___kcrctab) = .;                   \
 343         }                                                               \
 344                                                                         \
 345         /* Kernel symbol table: GPL-only symbols */                     \
 346         __kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {     \
 347                 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .;              \
 348                 *(SORT(___kcrctab_gpl+*))                               \
 349                 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .;               \
 350         }                                                               \
 351                                                                         \
 352         /* Kernel symbol table: Normal unused symbols */                \
 353         __kcrctab_unused  : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) {  \
 354                 VMLINUX_SYMBOL(__start___kcrctab_unused) = .;           \
 355                 *(SORT(___kcrctab_unused+*))                            \
 356                 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .;            \
 357         }                                                               \
 358                                                                         \
 359         /* Kernel symbol table: GPL-only unused symbols */              \
 360         __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
 361                 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .;       \
 362                 *(SORT(___kcrctab_unused_gpl+*))                        \
 363                 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .;        \
 364         }                                                               \
 365                                                                         \
 366         /* Kernel symbol table: GPL-future-only symbols */              \
 367         __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
 368                 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .;       \
 369                 *(SORT(___kcrctab_gpl_future+*))                        \
 370                 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .;        \
 371         }                                                               \
 372                                                                         \
 373         /* Kernel symbol table: strings */                              \
 374         __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
 375                 *(__ksymtab_strings)                                    \
 376         }                                                               \
 377                                                                         \
 378         /* __*init sections */                                          \
 379         __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {         \
 380                 *(.ref.rodata)                                          \
 381                 DEV_KEEP(init.rodata)                                   \
 382                 DEV_KEEP(exit.rodata)                                   \
 383                 CPU_KEEP(init.rodata)                                   \
 384                 CPU_KEEP(exit.rodata)                                   \
 385                 MEM_KEEP(init.rodata)                                   \
 386                 MEM_KEEP(exit.rodata)                                   \
 387         }                                                               \
 388                                                                         \
 389         /* Built-in module parameters. */                               \
 390         __param : AT(ADDR(__param) - LOAD_OFFSET) {                     \
 391                 VMLINUX_SYMBOL(__start___param) = .;                    \
 392                 *(__param)                                              \
 393                 VMLINUX_SYMBOL(__stop___param) = .;                     \
 394         }                                                               \
 395                                                                         \
 396         /* Built-in module versions. */                                 \
 397         __modver : AT(ADDR(__modver) - LOAD_OFFSET) {                   \
 398                 VMLINUX_SYMBOL(__start___modver) = .;                   \
 399                 *(__modver)                                             \
 400                 VMLINUX_SYMBOL(__stop___modver) = .;                    \
 401                 . = ALIGN((align));                                     \
 402                 VMLINUX_SYMBOL(__end_rodata) = .;                       \
 403         }                                                               \
 404         . = ALIGN((align));
 405
 406 /* RODATA & RO_DATA provided for backward compatibility.
 407  * All archs are supposed to use RO_DATA() */
 408 #define RODATA          RO_DATA_SECTION(4096)
 409 #define RO_DATA(align)  RO_DATA_SECTION(align)
 410
 411 #define SECURITY_INIT                                                   \
 412         .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
 413                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 414                 *(.security_initcall.init)                              \
 415                 VMLINUX_SYMBOL(__security_initcall_end) = .;            \
 416         }
 417
 418 /* .text section. Map to function alignment to avoid address changes
 419  * during second ld run in second ld pass when generating System.map */
 420 #define TEXT_TEXT                                                       \
 421                 ALIGN_FUNCTION();                                       \
 422                 *(.text.hot)                                            \
 423                 *(.text)                                                \
 424                 *(.ref.text)                                            \
 425         DEV_KEEP(init.text)                                             \
 426         DEV_KEEP(exit.text)                                             \
 427         CPU_KEEP(init.text)                                             \
 428         CPU_KEEP(exit.text)                                             \
 429         MEM_KEEP(init.text)                                             \
 430         MEM_KEEP(exit.text)                                             \
 431                 *(.text.unlikely)
 432
 433
 434 /* sched.text is aling to function alignment to secure we have same
 435  * address even at second ld pass when generating System.map */
 436 #define SCHED_TEXT                                                      \
 437                 ALIGN_FUNCTION();                                       \
 438                 VMLINUX_SYMBOL(__sched_text_start) = .;                 \
 439                 *(.sched.text)                                          \
 440                 VMLINUX_SYMBOL(__sched_text_end) = .;
 441
 442 /* spinlock.text is aling to function alignment to secure we have same
 443  * address even at second ld pass when generating System.map */
 444 #define LOCK_TEXT                                                       \
 445                 ALIGN_FUNCTION();                                       \
 446                 VMLINUX_SYMBOL(__lock_text_start) = .;                  \
 447                 *(.spinlock.text)                                       \
 448                 VMLINUX_SYMBOL(__lock_text_end) = .;
 449
 450 #define KPROBES_TEXT                                                    \
 451                 ALIGN_FUNCTION();                                       \
 452                 VMLINUX_SYMBOL(__kprobes_text_start) = .;               \
 453                 *(.kprobes.text)                                        \
 454                 VMLINUX_SYMBOL(__kprobes_text_end) = .;
 455
 456 #define ENTRY_TEXT                                                      \
 457                 ALIGN_FUNCTION();                                       \
 458                 VMLINUX_SYMBOL(__entry_text_start) = .;                 \
 459                 *(.entry.text)                                          \
 460                 VMLINUX_SYMBOL(__entry_text_end) = .;
 461
 462 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 463 #define IRQENTRY_TEXT                                                   \
 464                 ALIGN_FUNCTION();                                       \
 465                 VMLINUX_SYMBOL(__irqentry_text_start) = .;              \
 466                 *(.irqentry.text)                                       \
 467                 VMLINUX_SYMBOL(__irqentry_text_end) = .;
 468 #else
 469 #define IRQENTRY_TEXT
 470 #endif
 471
 472 /* Section used for early init (in .S files) */
 473 #define HEAD_TEXT  *(.head.text)
 474
 475 #define HEAD_TEXT_SECTION                                                       \
 476         .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {               \
 477                 HEAD_TEXT                                               \
 478         }
 479
 480 /*
 481  * Exception table
 482  */
 483 #define EXCEPTION_TABLE(align)                                          \
 484         . = ALIGN(align);                                               \
 485         __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {               \
 486                 VMLINUX_SYMBOL(__start___ex_table) = .;                 \
 487                 *(__ex_table)                                           \
 488                 VMLINUX_SYMBOL(__stop___ex_table) = .;                  \
 489         }
 490
 491 /*
 492  * Init task
 493  */
 494 #define INIT_TASK_DATA_SECTION(align)                                   \
 495         . = ALIGN(align);                                               \
 496         .data..init_task :  AT(ADDR(.data..init_task) - LOAD_OFFSET) {  \
 497                 INIT_TASK_DATA(align)                                   \
 498         }
 499
 500 #ifdef CONFIG_CONSTRUCTORS
 501 #define KERNEL_CTORS()  . = ALIGN(8);                      \
 502                         VMLINUX_SYMBOL(__ctors_start) = .; \
 503                         *(.ctors)                          \
 504                         VMLINUX_SYMBOL(__ctors_end) = .;
 505 #else
 506 #define KERNEL_CTORS()
 507 #endif
 508
 509 /* init and exit section handling */
 510 #define INIT_DATA                                                       \
 511         *(.init.data)                                                   \
 512         DEV_DISCARD(init.data)                                          \
 513         CPU_DISCARD(init.data)                                          \
 514         MEM_DISCARD(init.data)                                          \
 515         KERNEL_CTORS()                                                  \
 516         MCOUNT_REC()                                                    \
 517         *(.init.rodata)                                                 \
 518         FTRACE_EVENTS()                                                 \
 519         TRACE_SYSCALLS()                                                \
 520         DEV_DISCARD(init.rodata)                                        \
 521         CPU_DISCARD(init.rodata)                                        \
 522         MEM_DISCARD(init.rodata)                                        \
 523         CLK_OF_TABLES()                                                 \
 524         CLKSRC_OF_TABLES()                                              \
 525         KERNEL_DTB()                                                    \
 526         IRQCHIP_OF_MATCH_TABLE()
 527
 528 #define INIT_TEXT                                                       \
 529         *(.init.text)                                                   \
 530         DEV_DISCARD(init.text)                                          \
 531         CPU_DISCARD(init.text)                                          \
 532         MEM_DISCARD(init.text)
 533
 534 #define EXIT_DATA                                                       \
 535         *(.exit.data)                                                   \
 536         DEV_DISCARD(exit.data)                                          \
 537         DEV_DISCARD(exit.rodata)                                        \
 538         CPU_DISCARD(exit.data)                                          \
 539         CPU_DISCARD(exit.rodata)                                        \
 540         MEM_DISCARD(exit.data)                                          \
 541         MEM_DISCARD(exit.rodata)
 542
 543 #define EXIT_TEXT                                                       \
 544         *(.exit.text)                                                   \
 545         DEV_DISCARD(exit.text)                                          \
 546         CPU_DISCARD(exit.text)                                          \
 547         MEM_DISCARD(exit.text)
 548
 549 #define EXIT_CALL                                                       \
 550         *(.exitcall.exit)
 551
 552 /*
 553  * bss (Block Started by Symbol) - uninitialized data
 554  * zeroed during startup
 555  */
 556 #define SBSS(sbss_align)                                                \
 557         . = ALIGN(sbss_align);                                          \
 558         .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {                         \
 559                 *(.sbss)                                                \
 560                 *(.scommon)                                             \
 561         }
 562
 563 /*
 564  * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
 565  * sections to the front of bss.
 566  */
 567 #ifndef BSS_FIRST_SECTIONS
 568 #define BSS_FIRST_SECTIONS
 569 #endif
 570
 571 #define BSS(bss_align)                                                  \
 572         . = ALIGN(bss_align);                                           \
 573         .bss : AT(ADDR(.bss) - LOAD_OFFSET) {                           \
 574                 BSS_FIRST_SECTIONS                                      \
 575                 *(.bss..page_aligned)                                   \
 576                 *(.dynbss)                                              \
 577                 *(.bss)                                                 \
 578                 *(COMMON)                                               \
 579         }
 580
 581 /*
 582  * DWARF debug sections.
 583  * Symbols in the DWARF debugging sections are relative to
 584  * the beginning of the section so we begin them at 0.
 585  */
 586 #define DWARF_DEBUG                                                     \
 587                 /* DWARF 1 */                                           \
 588                 .debug          0 : { *(.debug) }                       \
 589                 .line           0 : { *(.line) }                        \
 590                 /* GNU DWARF 1 extensions */                            \
 591                 .debug_srcinfo  0 : { *(.debug_srcinfo) }               \
 592                 .debug_sfnames  0 : { *(.debug_sfnames) }               \
 593                 /* DWARF 1.1 and DWARF 2 */                             \
 594                 .debug_aranges  0 : { *(.debug_aranges) }               \
 595                 .debug_pubnames 0 : { *(.debug_pubnames) }              \
 596                 /* DWARF 2 */                                           \
 597                 .debug_info     0 : { *(.debug_info                     \
 598                                 .gnu.linkonce.wi.*) }                   \
 599                 .debug_abbrev   0 : { *(.debug_abbrev) }                \
 600                 .debug_line     0 : { *(.debug_line) }                  \
 601                 .debug_frame    0 : { *(.debug_frame) }                 \
 602                 .debug_str      0 : { *(.debug_str) }                   \
 603                 .debug_loc      0 : { *(.debug_loc) }                   \
 604                 .debug_macinfo  0 : { *(.debug_macinfo) }               \
 605                 /* SGI/MIPS DWARF 2 extensions */                       \
 606                 .debug_weaknames 0 : { *(.debug_weaknames) }            \
 607                 .debug_funcnames 0 : { *(.debug_funcnames) }            \
 608                 .debug_typenames 0 : { *(.debug_typenames) }            \
 609                 .debug_varnames  0 : { *(.debug_varnames) }             \
 610
 611                 /* Stabs debugging sections.  */
 612 #define STABS_DEBUG                                                     \
 613                 .stab 0 : { *(.stab) }                                  \
 614                 .stabstr 0 : { *(.stabstr) }                            \
 615                 .stab.excl 0 : { *(.stab.excl) }                        \
 616                 .stab.exclstr 0 : { *(.stab.exclstr) }                  \
 617                 .stab.index 0 : { *(.stab.index) }                      \
 618                 .stab.indexstr 0 : { *(.stab.indexstr) }                \
 619                 .comment 0 : { *(.comment) }
 620
 621 #ifdef CONFIG_GENERIC_BUG
 622 #define BUG_TABLE                                                       \
 623         . = ALIGN(8);                                                   \
 624         __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {             \
 625                 VMLINUX_SYMBOL(__start___bug_table) = .;                \
 626                 *(__bug_table)                                          \
 627                 VMLINUX_SYMBOL(__stop___bug_table) = .;                 \
 628         }
 629 #else
 630 #define BUG_TABLE
 631 #endif
 632
 633 #ifdef CONFIG_PM_TRACE
 634 #define TRACEDATA                                                       \
 635         . = ALIGN(4);                                                   \
 636         .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {               \
 637                 VMLINUX_SYMBOL(__tracedata_start) = .;                  \
 638                 *(.tracedata)                                           \
 639                 VMLINUX_SYMBOL(__tracedata_end) = .;                    \
 640         }
 641 #else
 642 #define TRACEDATA
 643 #endif
 644
 645 #define NOTES                                                           \
 646         .notes : AT(ADDR(.notes) - LOAD_OFFSET) {                       \
 647                 VMLINUX_SYMBOL(__start_notes) = .;                      \
 648                 *(.note.*)                                              \
 649                 VMLINUX_SYMBOL(__stop_notes) = .;                       \
 650         }
 651
 652 #define INIT_SETUP(initsetup_align)                                     \
 653                 . = ALIGN(initsetup_align);                             \
 654                 VMLINUX_SYMBOL(__setup_start) = .;                      \
 655                 *(.init.setup)                                          \
 656                 VMLINUX_SYMBOL(__setup_end) = .;
 657
 658 #define INIT_CALLS_LEVEL(level)                                         \
 659                 VMLINUX_SYMBOL(__initcall##level##_start) = .;          \
 660                 *(.initcall##level##.init)                              \
 661                 *(.initcall##level##s.init)                             \
 662
 663 #define INIT_CALLS                                                      \
 664                 VMLINUX_SYMBOL(__initcall_start) = .;                   \
 665                 *(.initcallearly.init)                                  \
 666                 INIT_CALLS_LEVEL(0)                                     \
 667                 INIT_CALLS_LEVEL(1)                                     \
 668                 INIT_CALLS_LEVEL(2)                                     \
 669                 INIT_CALLS_LEVEL(3)                                     \
 670                 INIT_CALLS_LEVEL(4)                                     \
 671                 INIT_CALLS_LEVEL(5)                                     \
 672                 INIT_CALLS_LEVEL(rootfs)                                \
 673                 INIT_CALLS_LEVEL(6)                                     \
 674                 INIT_CALLS_LEVEL(7)                                     \
 675                 VMLINUX_SYMBOL(__initcall_end) = .;
 676
 677 #define CON_INITCALL                                                    \
 678                 VMLINUX_SYMBOL(__con_initcall_start) = .;               \
 679                 *(.con_initcall.init)                                   \
 680                 VMLINUX_SYMBOL(__con_initcall_end) = .;
 681
 682 #define SECURITY_INITCALL                                               \
 683                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 684                 *(.security_initcall.init)                              \
 685                 VMLINUX_SYMBOL(__security_initcall_end) = .;
 686
 687 #ifdef CONFIG_BLK_DEV_INITRD
 688 #define INIT_RAM_FS                                                     \
 689         . = ALIGN(4);                                                   \
 690         VMLINUX_SYMBOL(__initramfs_start) = .;                          \
 691         *(.init.ramfs)                                                  \
 692         . = ALIGN(8);                                                   \
 693         *(.init.ramfs.info)
 694 #else
 695 #define INIT_RAM_FS
 696 #endif
 697
 698 /*
 699  * Default discarded sections.
 700  *
 701  * Some archs want to discard exit text/data at runtime rather than
 702  * link time due to cross-section references such as alt instructions,
 703  * bug table, eh_frame, etc.  DISCARDS must be the last of output
 704  * section definitions so that such archs put those in earlier section
 705  * definitions.
 706  */
 707 #define DISCARDS                                                        \
 708         /DISCARD/ : {                                                   \
 709         EXIT_TEXT                                                       \
 710         EXIT_DATA                                                       \
 711         EXIT_CALL                                                       \
 712         *(.discard)                                                     \
 713         *(.discard.*)                                                   \
 714         }
 715
 716 /**
 717  * PERCPU_INPUT - the percpu input sections
 718  * @cacheline: cacheline size
 719  *
 720  * The core percpu section names and core symbols which do not rely
 721  * directly upon load addresses.
 722  *
 723  * @cacheline is used to align subsections to avoid false cacheline
 724  * sharing between subsections for different purposes.
 725  */
 726 #define PERCPU_INPUT(cacheline)                                         \
 727         VMLINUX_SYMBOL(__per_cpu_start) = .;                            \
 728         *(.data..percpu..first)                                         \
 729         . = ALIGN(PAGE_SIZE);                                           \
 730         *(.data..percpu..page_aligned)                                  \
 731         . = ALIGN(cacheline);                                           \
 732         *(.data..percpu..readmostly)                                    \
 733         . = ALIGN(cacheline);                                           \
 734         *(.data..percpu)                                                \
 735         *(.data..percpu..shared_aligned)                                \
 736         VMLINUX_SYMBOL(__per_cpu_end) = .;
 737
 738 /**
 739  * PERCPU_VADDR - define output section for percpu area
 740  * @cacheline: cacheline size
 741  * @vaddr: explicit base address (optional)
 742  * @phdr: destination PHDR (optional)
 743  *
 744  * Macro which expands to output section for percpu area.
 745  *
 746  * @cacheline is used to align subsections to avoid false cacheline
 747  * sharing between subsections for different purposes.
 748  *
 749  * If @vaddr is not blank, it specifies explicit base address and all
 750  * percpu symbols will be offset from the given address.  If blank,
 751  * @vaddr always equals @laddr + LOAD_OFFSET.
 752  *
 753  * @phdr defines the output PHDR to use if not blank.  Be warned that
 754  * output PHDR is sticky.  If @phdr is specified, the next output
 755  * section in the linker script will go there too.  @phdr should have
 756  * a leading colon.
 757  *
 758  * Note that this macros defines __per_cpu_load as an absolute symbol.
 759  * If there is no need to put the percpu section at a predetermined
 760  * address, use PERCPU_SECTION.
 761  */
 762 #define PERCPU_VADDR(cacheline, vaddr, phdr)                            \
 763         VMLINUX_SYMBOL(__per_cpu_load) = .;                             \
 764         .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load)         \
 765                                 - LOAD_OFFSET) {                        \
 766                 PERCPU_INPUT(cacheline)                                 \
 767         } phdr                                                          \
 768         . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
 769
 770 /**
 771  * PERCPU_SECTION - define output section for percpu area, simple version
 772  * @cacheline: cacheline size
 773  *
 774  * Align to PAGE_SIZE and outputs output section for percpu area.  This
 775  * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
 776  * __per_cpu_start will be identical.
 777  *
 778  * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
 779  * except that __per_cpu_load is defined as a relative symbol against
 780  * .data..percpu which is required for relocatable x86_32 configuration.
 781  */
 782 #define PERCPU_SECTION(cacheline)                                       \
 783         . = ALIGN(PAGE_SIZE);                                           \
 784         .data..percpu   : AT(ADDR(.data..percpu) - LOAD_OFFSET) {       \
 785                 VMLINUX_SYMBOL(__per_cpu_load) = .;                     \
 786                 PERCPU_INPUT(cacheline)                                 \
 787         }
 788
 789
 790 /*
 791  * Definition of the high level *_SECTION macros
 792  * They will fit only a subset of the architectures
 793  */
 794
 795
 796 /*
 797  * Writeable data.
 798  * All sections are combined in a single .data section.
 799  * The sections following CONSTRUCTORS are arranged so their
 800  * typical alignment matches.
 801  * A cacheline is typical/always less than a PAGE_SIZE so
 802  * the sections that has this restriction (or similar)
 803  * is located before the ones requiring PAGE_SIZE alignment.
 804  * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
 805  * matches the requirement of PAGE_ALIGNED_DATA.
 806  *
 807  * use 0 as page_align if page_aligned data is not used */
 808 #define RW_DATA_SECTION(cacheline, pagealigned, inittask)               \
 809         . = ALIGN(PAGE_SIZE);                                           \
 810         .data : AT(ADDR(.data) - LOAD_OFFSET) {                         \
 811                 INIT_TASK_DATA(inittask)                                \
 812                 NOSAVE_DATA                                             \
 813                 PAGE_ALIGNED_DATA(pagealigned)                          \
 814                 CACHELINE_ALIGNED_DATA(cacheline)                       \
 815                 READ_MOSTLY_DATA(cacheline)                             \
 816                 DATA_DATA                                               \
 817                 CONSTRUCTORS                                            \
 818         }
 819
 820 #define INIT_TEXT_SECTION(inittext_align)                               \
 821         . = ALIGN(inittext_align);                                      \
 822         .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {               \
 823                 VMLINUX_SYMBOL(_sinittext) = .;                         \
 824                 INIT_TEXT                                               \
 825                 VMLINUX_SYMBOL(_einittext) = .;                         \
 826         }
 827
 828 #define INIT_DATA_SECTION(initsetup_align)                              \
 829         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {               \
 830                 INIT_DATA                                               \
 831                 INIT_SETUP(initsetup_align)                             \
 832                 INIT_CALLS                                              \
 833                 CON_INITCALL                                            \
 834                 SECURITY_INITCALL                                       \
 835                 INIT_RAM_FS                                             \
 836         }
 837
 838 #define BSS_SECTION(sbss_align, bss_align, stop_align)                  \
 839         . = ALIGN(sbss_align);                                          \
 840         VMLINUX_SYMBOL(__bss_start) = .;                                \
 841         SBSS(sbss_align)                                                \
 842         BSS(bss_align)                                                  \
 843         . = ALIGN(stop_align);                                          \
 844         VMLINUX_SYMBOL(__bss_stop) = .;