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  *      // __init_begin and __init_end should be page aligned, so that we can
  44  *      // free the whole .init memory
  45  * [_stext, _etext] is the text section
  46  * [_sdata, _edata] is the data section
  47  *
  48  * Some of the included output section have their own set of constants.
  49  * Examples are: [__initramfs_start, __initramfs_end] for initramfs and
  50  *               [__nosave_begin, __nosave_end] for the nosave data
  51  */
  52
  53 #ifndef LOAD_OFFSET
  54 #define LOAD_OFFSET 0
  55 #endif
  56
  57 #include <linux/export.h>
  58
  59 /* Align . to a 8 byte boundary equals to maximum function alignment. */
  60 #define ALIGN_FUNCTION()  . = ALIGN(8)
  61
  62 /*
  63  * Align to a 32 byte boundary equal to the
  64  * alignment gcc 4.5 uses for a struct
  65  */
  66 #define STRUCT_ALIGNMENT 32
  67 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
  68
  69 /* The actual configuration determine if the init/exit sections
  70  * are handled as text/data or they can be discarded (which
  71  * often happens at runtime)
  72  */
  73 #ifdef CONFIG_HOTPLUG_CPU
  74 #define CPU_KEEP(sec)    *(.cpu##sec)
  75 #define CPU_DISCARD(sec)
  76 #else
  77 #define CPU_KEEP(sec)
  78 #define CPU_DISCARD(sec) *(.cpu##sec)
  79 #endif
  80
  81 #if defined(CONFIG_MEMORY_HOTPLUG)
  82 #define MEM_KEEP(sec)    *(.mem##sec)
  83 #define MEM_DISCARD(sec)
  84 #else
  85 #define MEM_KEEP(sec)
  86 #define MEM_DISCARD(sec) *(.mem##sec)
  87 #endif
  88
  89 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
  90 #define MCOUNT_REC()    . = ALIGN(8);                           \
  91                         VMLINUX_SYMBOL(__start_mcount_loc) = .; \
  92                         *(__mcount_loc)                         \
  93                         VMLINUX_SYMBOL(__stop_mcount_loc) = .;
  94 #else
  95 #define MCOUNT_REC()
  96 #endif
  97
  98 #ifdef CONFIG_TRACE_BRANCH_PROFILING
  99 #define LIKELY_PROFILE()        VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \
 100                                 *(_ftrace_annotated_branch)                           \
 101                                 VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .;
 102 #else
 103 #define LIKELY_PROFILE()
 104 #endif
 105
 106 #ifdef CONFIG_PROFILE_ALL_BRANCHES
 107 #define BRANCH_PROFILE()        VMLINUX_SYMBOL(__start_branch_profile) = .;   \
 108                                 *(_ftrace_branch)                             \
 109                                 VMLINUX_SYMBOL(__stop_branch_profile) = .;
 110 #else
 111 #define BRANCH_PROFILE()
 112 #endif
 113
 114 #ifdef CONFIG_KPROBES
 115 #define KPROBE_BLACKLIST()      . = ALIGN(8);                                 \
 116                                 VMLINUX_SYMBOL(__start_kprobe_blacklist) = .; \
 117                                 *(_kprobe_blacklist)                          \
 118                                 VMLINUX_SYMBOL(__stop_kprobe_blacklist) = .;
 119 #else
 120 #define KPROBE_BLACKLIST()
 121 #endif
 122
 123 #ifdef CONFIG_EVENT_TRACING
 124 #define FTRACE_EVENTS() . = ALIGN(8);                                   \
 125                         VMLINUX_SYMBOL(__start_ftrace_events) = .;      \
 126                         *(_ftrace_events)                               \
 127                         VMLINUX_SYMBOL(__stop_ftrace_events) = .;       \
 128                         VMLINUX_SYMBOL(__start_ftrace_enum_maps) = .;   \
 129                         *(_ftrace_enum_map)                             \
 130                         VMLINUX_SYMBOL(__stop_ftrace_enum_maps) = .;
 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 #define TRACEPOINT_STR() VMLINUX_SYMBOL(__start___tracepoint_str) = .;  \
 140                          *(__tracepoint_str) /* Trace_printk fmt' pointer */ \
 141                          VMLINUX_SYMBOL(__stop___tracepoint_str) = .;
 142 #else
 143 #define TRACE_PRINTKS()
 144 #define TRACEPOINT_STR()
 145 #endif
 146
 147 #ifdef CONFIG_FTRACE_SYSCALLS
 148 #define TRACE_SYSCALLS() . = ALIGN(8);                                  \
 149                          VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \
 150                          *(__syscalls_metadata)                         \
 151                          VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
 152 #else
 153 #define TRACE_SYSCALLS()
 154 #endif
 155
 156
 157 #define ___OF_TABLE(cfg, name)  _OF_TABLE_##cfg(name)
 158 #define __OF_TABLE(cfg, name)   ___OF_TABLE(cfg, name)
 159 #define OF_TABLE(cfg, name)     __OF_TABLE(config_enabled(cfg), name)
 160 #define _OF_TABLE_0(name)
 161 #define _OF_TABLE_1(name)                                               \
 162         . = ALIGN(8);                                                   \
 163         VMLINUX_SYMBOL(__##name##_of_table) = .;                        \
 164         *(__##name##_of_table)                                          \
 165         *(__##name##_of_table_end)
 166
 167 #define CLKSRC_OF_TABLES()      OF_TABLE(CONFIG_CLKSRC_OF, clksrc)
 168 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
 169 #define CLK_OF_TABLES()         OF_TABLE(CONFIG_COMMON_CLK, clk)
 170 #define IOMMU_OF_TABLES()       OF_TABLE(CONFIG_OF_IOMMU, iommu)
 171 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
 172 #define CPU_METHOD_OF_TABLES()  OF_TABLE(CONFIG_SMP, cpu_method)
 173 #define EARLYCON_OF_TABLES()    OF_TABLE(CONFIG_SERIAL_EARLYCON, earlycon)
 174
 175 #define KERNEL_DTB()                                                    \
 176         STRUCT_ALIGN();                                                 \
 177         VMLINUX_SYMBOL(__dtb_start) = .;                                \
 178         *(.dtb.init.rodata)                                             \
 179         VMLINUX_SYMBOL(__dtb_end) = .;
 180
 181 /* .data section */
 182 #define DATA_DATA                                                       \
 183         *(.data)                                                        \
 184         *(.ref.data)                                                    \
 185         *(.data..shared_aligned) /* percpu related */                   \
 186         MEM_KEEP(init.data)                                             \
 187         MEM_KEEP(exit.data)                                             \
 188         *(.data.unlikely)                                               \
 189         STRUCT_ALIGN();                                                 \
 190         *(__tracepoints)                                                \
 191         /* implement dynamic printk debug */                            \
 192         . = ALIGN(8);                                                   \
 193         VMLINUX_SYMBOL(__start___jump_table) = .;                       \
 194         *(__jump_table)                                                 \
 195         VMLINUX_SYMBOL(__stop___jump_table) = .;                        \
 196         . = ALIGN(8);                                                   \
 197         VMLINUX_SYMBOL(__start___verbose) = .;                          \
 198         *(__verbose)                                                    \
 199         VMLINUX_SYMBOL(__stop___verbose) = .;                           \
 200         LIKELY_PROFILE()                                                \
 201         BRANCH_PROFILE()                                                \
 202         TRACE_PRINTKS()                                                 \
 203         TRACEPOINT_STR()
 204
 205 /*
 206  * Data section helpers
 207  */
 208 #define NOSAVE_DATA                                                     \
 209         . = ALIGN(PAGE_SIZE);                                           \
 210         VMLINUX_SYMBOL(__nosave_begin) = .;                             \
 211         *(.data..nosave)                                                \
 212         . = ALIGN(PAGE_SIZE);                                           \
 213         VMLINUX_SYMBOL(__nosave_end) = .;
 214
 215 #define PAGE_ALIGNED_DATA(page_align)                                   \
 216         . = ALIGN(page_align);                                          \
 217         *(.data..page_aligned)
 218
 219 #define READ_MOSTLY_DATA(align)                                         \
 220         . = ALIGN(align);                                               \
 221         *(.data..read_mostly)                                           \
 222         . = ALIGN(align);
 223
 224 #define CACHELINE_ALIGNED_DATA(align)                                   \
 225         . = ALIGN(align);                                               \
 226         *(.data..cacheline_aligned)
 227
 228 #define INIT_TASK_DATA(align)                                           \
 229         . = ALIGN(align);                                               \
 230         *(.data..init_task)
 231
 232 /*
 233  * Read only Data
 234  */
 235 #define RO_DATA_SECTION(align)                                          \
 236         . = ALIGN((align));                                             \
 237         .rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {           \
 238                 VMLINUX_SYMBOL(__start_rodata) = .;                     \
 239                 *(.rodata) *(.rodata.*)                                 \
 240                 *(__vermagic)           /* Kernel version magic */      \
 241                 . = ALIGN(8);                                           \
 242                 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .;         \
 243                 *(__tracepoints_ptrs)   /* Tracepoints: pointer array */\
 244                 VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .;          \
 245                 *(__tracepoints_strings)/* Tracepoints: strings */      \
 246         }                                                               \
 247                                                                         \
 248         .rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {          \
 249                 *(.rodata1)                                             \
 250         }                                                               \
 251                                                                         \
 252         BUG_TABLE                                                       \
 253                                                                         \
 254         /* PCI quirks */                                                \
 255         .pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {        \
 256                 VMLINUX_SYMBOL(__start_pci_fixups_early) = .;           \
 257                 *(.pci_fixup_early)                                     \
 258                 VMLINUX_SYMBOL(__end_pci_fixups_early) = .;             \
 259                 VMLINUX_SYMBOL(__start_pci_fixups_header) = .;          \
 260                 *(.pci_fixup_header)                                    \
 261                 VMLINUX_SYMBOL(__end_pci_fixups_header) = .;            \
 262                 VMLINUX_SYMBOL(__start_pci_fixups_final) = .;           \
 263                 *(.pci_fixup_final)                                     \
 264                 VMLINUX_SYMBOL(__end_pci_fixups_final) = .;             \
 265                 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .;          \
 266                 *(.pci_fixup_enable)                                    \
 267                 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .;            \
 268                 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .;          \
 269                 *(.pci_fixup_resume)                                    \
 270                 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .;            \
 271                 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .;    \
 272                 *(.pci_fixup_resume_early)                              \
 273                 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .;      \
 274                 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .;         \
 275                 *(.pci_fixup_suspend)                                   \
 276                 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .;           \
 277                 VMLINUX_SYMBOL(__start_pci_fixups_suspend_late) = .;    \
 278                 *(.pci_fixup_suspend_late)                              \
 279                 VMLINUX_SYMBOL(__end_pci_fixups_suspend_late) = .;      \
 280         }                                                               \
 281                                                                         \
 282         /* Built-in firmware blobs */                                   \
 283         .builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {      \
 284                 VMLINUX_SYMBOL(__start_builtin_fw) = .;                 \
 285                 *(.builtin_fw)                                          \
 286                 VMLINUX_SYMBOL(__end_builtin_fw) = .;                   \
 287         }                                                               \
 288                                                                         \
 289         TRACEDATA                                                       \
 290                                                                         \
 291         /* Kernel symbol table: Normal symbols */                       \
 292         __ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {         \
 293                 VMLINUX_SYMBOL(__start___ksymtab) = .;                  \
 294                 *(SORT(___ksymtab+*))                                   \
 295                 VMLINUX_SYMBOL(__stop___ksymtab) = .;                   \
 296         }                                                               \
 297                                                                         \
 298         /* Kernel symbol table: GPL-only symbols */                     \
 299         __ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {     \
 300                 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .;              \
 301                 *(SORT(___ksymtab_gpl+*))                               \
 302                 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .;               \
 303         }                                                               \
 304                                                                         \
 305         /* Kernel symbol table: Normal unused symbols */                \
 306         __ksymtab_unused  : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) {  \
 307                 VMLINUX_SYMBOL(__start___ksymtab_unused) = .;           \
 308                 *(SORT(___ksymtab_unused+*))                            \
 309                 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .;            \
 310         }                                                               \
 311                                                                         \
 312         /* Kernel symbol table: GPL-only unused symbols */              \
 313         __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
 314                 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .;       \
 315                 *(SORT(___ksymtab_unused_gpl+*))                        \
 316                 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .;        \
 317         }                                                               \
 318                                                                         \
 319         /* Kernel symbol table: GPL-future-only symbols */              \
 320         __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
 321                 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .;       \
 322                 *(SORT(___ksymtab_gpl_future+*))                        \
 323                 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .;        \
 324         }                                                               \
 325                                                                         \
 326         /* Kernel symbol table: Normal symbols */                       \
 327         __kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {         \
 328                 VMLINUX_SYMBOL(__start___kcrctab) = .;                  \
 329                 *(SORT(___kcrctab+*))                                   \
 330                 VMLINUX_SYMBOL(__stop___kcrctab) = .;                   \
 331         }                                                               \
 332                                                                         \
 333         /* Kernel symbol table: GPL-only symbols */                     \
 334         __kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {     \
 335                 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .;              \
 336                 *(SORT(___kcrctab_gpl+*))                               \
 337                 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .;               \
 338         }                                                               \
 339                                                                         \
 340         /* Kernel symbol table: Normal unused symbols */                \
 341         __kcrctab_unused  : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) {  \
 342                 VMLINUX_SYMBOL(__start___kcrctab_unused) = .;           \
 343                 *(SORT(___kcrctab_unused+*))                            \
 344                 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .;            \
 345         }                                                               \
 346                                                                         \
 347         /* Kernel symbol table: GPL-only unused symbols */              \
 348         __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
 349                 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .;       \
 350                 *(SORT(___kcrctab_unused_gpl+*))                        \
 351                 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .;        \
 352         }                                                               \
 353                                                                         \
 354         /* Kernel symbol table: GPL-future-only symbols */              \
 355         __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
 356                 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .;       \
 357                 *(SORT(___kcrctab_gpl_future+*))                        \
 358                 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .;        \
 359         }                                                               \
 360                                                                         \
 361         /* Kernel symbol table: strings */                              \
 362         __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
 363                 *(__ksymtab_strings)                                    \
 364         }                                                               \
 365                                                                         \
 366         /* __*init sections */                                          \
 367         __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {         \
 368                 *(.ref.rodata)                                          \
 369                 MEM_KEEP(init.rodata)                                   \
 370                 MEM_KEEP(exit.rodata)                                   \
 371         }                                                               \
 372                                                                         \
 373         /* Built-in module parameters. */                               \
 374         __param : AT(ADDR(__param) - LOAD_OFFSET) {                     \
 375                 VMLINUX_SYMBOL(__start___param) = .;                    \
 376                 *(__param)                                              \
 377                 VMLINUX_SYMBOL(__stop___param) = .;                     \
 378         }                                                               \
 379                                                                         \
 380         /* Built-in module versions. */                                 \
 381         __modver : AT(ADDR(__modver) - LOAD_OFFSET) {                   \
 382                 VMLINUX_SYMBOL(__start___modver) = .;                   \
 383                 *(__modver)                                             \
 384                 VMLINUX_SYMBOL(__stop___modver) = .;                    \
 385                 . = ALIGN((align));                                     \
 386                 VMLINUX_SYMBOL(__end_rodata) = .;                       \
 387         }                                                               \
 388         . = ALIGN((align));
 389
 390 /* RODATA & RO_DATA provided for backward compatibility.
 391  * All archs are supposed to use RO_DATA() */
 392 #define RODATA          RO_DATA_SECTION(4096)
 393 #define RO_DATA(align)  RO_DATA_SECTION(align)
 394
 395 #define SECURITY_INIT                                                   \
 396         .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
 397                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 398                 *(.security_initcall.init)                              \
 399                 VMLINUX_SYMBOL(__security_initcall_end) = .;            \
 400         }
 401
 402 /* .text section. Map to function alignment to avoid address changes
 403  * during second ld run in second ld pass when generating System.map */
 404 #define TEXT_TEXT                                                       \
 405                 ALIGN_FUNCTION();                                       \
 406                 *(.text.hot)                                            \
 407                 *(.text)                                                \
 408                 *(.ref.text)                                            \
 409         MEM_KEEP(init.text)                                             \
 410         MEM_KEEP(exit.text)                                             \
 411                 *(.text.unlikely)
 412
 413
 414 /* sched.text is aling to function alignment to secure we have same
 415  * address even at second ld pass when generating System.map */
 416 #define SCHED_TEXT                                                      \
 417                 ALIGN_FUNCTION();                                       \
 418                 VMLINUX_SYMBOL(__sched_text_start) = .;                 \
 419                 *(.sched.text)                                          \
 420                 VMLINUX_SYMBOL(__sched_text_end) = .;
 421
 422 /* spinlock.text is aling to function alignment to secure we have same
 423  * address even at second ld pass when generating System.map */
 424 #define LOCK_TEXT                                                       \
 425                 ALIGN_FUNCTION();                                       \
 426                 VMLINUX_SYMBOL(__lock_text_start) = .;                  \
 427                 *(.spinlock.text)                                       \
 428                 VMLINUX_SYMBOL(__lock_text_end) = .;
 429
 430 #define KPROBES_TEXT                                                    \
 431                 ALIGN_FUNCTION();                                       \
 432                 VMLINUX_SYMBOL(__kprobes_text_start) = .;               \
 433                 *(.kprobes.text)                                        \
 434                 VMLINUX_SYMBOL(__kprobes_text_end) = .;
 435
 436 #define ENTRY_TEXT                                                      \
 437                 ALIGN_FUNCTION();                                       \
 438                 VMLINUX_SYMBOL(__entry_text_start) = .;                 \
 439                 *(.entry.text)                                          \
 440                 VMLINUX_SYMBOL(__entry_text_end) = .;
 441
 442 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 443 #define IRQENTRY_TEXT                                                   \
 444                 ALIGN_FUNCTION();                                       \
 445                 VMLINUX_SYMBOL(__irqentry_text_start) = .;              \
 446                 *(.irqentry.text)                                       \
 447                 VMLINUX_SYMBOL(__irqentry_text_end) = .;
 448 #else
 449 #define IRQENTRY_TEXT
 450 #endif
 451
 452 /* Section used for early init (in .S files) */
 453 #define HEAD_TEXT  *(.head.text)
 454
 455 #define HEAD_TEXT_SECTION                                                       \
 456         .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {               \
 457                 HEAD_TEXT                                               \
 458         }
 459
 460 /*
 461  * Exception table
 462  */
 463 #define EXCEPTION_TABLE(align)                                          \
 464         . = ALIGN(align);                                               \
 465         __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {               \
 466                 VMLINUX_SYMBOL(__start___ex_table) = .;                 \
 467                 *(__ex_table)                                           \
 468                 VMLINUX_SYMBOL(__stop___ex_table) = .;                  \
 469         }
 470
 471 /*
 472  * Init task
 473  */
 474 #define INIT_TASK_DATA_SECTION(align)                                   \
 475         . = ALIGN(align);                                               \
 476         .data..init_task :  AT(ADDR(.data..init_task) - LOAD_OFFSET) {  \
 477                 INIT_TASK_DATA(align)                                   \
 478         }
 479
 480 #ifdef CONFIG_CONSTRUCTORS
 481 #define KERNEL_CTORS()  . = ALIGN(8);                      \
 482                         VMLINUX_SYMBOL(__ctors_start) = .; \
 483                         *(.ctors)                          \
 484                         *(SORT(.init_array.*))             \
 485                         *(.init_array)                     \
 486                         VMLINUX_SYMBOL(__ctors_end) = .;
 487 #else
 488 #define KERNEL_CTORS()
 489 #endif
 490
 491 /* init and exit section handling */
 492 #define INIT_DATA                                                       \
 493         *(.init.data)                                                   \
 494         MEM_DISCARD(init.data)                                          \
 495         KERNEL_CTORS()                                                  \
 496         MCOUNT_REC()                                                    \
 497         *(.init.rodata)                                                 \
 498         FTRACE_EVENTS()                                                 \
 499         TRACE_SYSCALLS()                                                \
 500         KPROBE_BLACKLIST()                                              \
 501         MEM_DISCARD(init.rodata)                                        \
 502         CLK_OF_TABLES()                                                 \
 503         RESERVEDMEM_OF_TABLES()                                         \
 504         CLKSRC_OF_TABLES()                                              \
 505         IOMMU_OF_TABLES()                                               \
 506         CPU_METHOD_OF_TABLES()                                          \
 507         KERNEL_DTB()                                                    \
 508         IRQCHIP_OF_MATCH_TABLE()                                        \
 509         EARLYCON_OF_TABLES()
 510
 511 #define INIT_TEXT                                                       \
 512         *(.init.text)                                                   \
 513         MEM_DISCARD(init.text)
 514
 515 #define EXIT_DATA                                                       \
 516         *(.exit.data)                                                   \
 517         MEM_DISCARD(exit.data)                                          \
 518         MEM_DISCARD(exit.rodata)
 519
 520 #define EXIT_TEXT                                                       \
 521         *(.exit.text)                                                   \
 522         MEM_DISCARD(exit.text)
 523
 524 #define EXIT_CALL                                                       \
 525         *(.exitcall.exit)
 526
 527 /*
 528  * bss (Block Started by Symbol) - uninitialized data
 529  * zeroed during startup
 530  */
 531 #define SBSS(sbss_align)                                                \
 532         . = ALIGN(sbss_align);                                          \
 533         .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {                         \
 534                 *(.sbss)                                                \
 535                 *(.scommon)                                             \
 536         }
 537
 538 /*
 539  * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
 540  * sections to the front of bss.
 541  */
 542 #ifndef BSS_FIRST_SECTIONS
 543 #define BSS_FIRST_SECTIONS
 544 #endif
 545
 546 #define BSS(bss_align)                                                  \
 547         . = ALIGN(bss_align);                                           \
 548         .bss : AT(ADDR(.bss) - LOAD_OFFSET) {                           \
 549                 BSS_FIRST_SECTIONS                                      \
 550                 *(.bss..page_aligned)                                   \
 551                 *(.dynbss)                                              \
 552                 *(.bss)                                                 \
 553                 *(COMMON)                                               \
 554         }
 555
 556 /*
 557  * DWARF debug sections.
 558  * Symbols in the DWARF debugging sections are relative to
 559  * the beginning of the section so we begin them at 0.
 560  */
 561 #define DWARF_DEBUG                                                     \
 562                 /* DWARF 1 */                                           \
 563                 .debug          0 : { *(.debug) }                       \
 564                 .line           0 : { *(.line) }                        \
 565                 /* GNU DWARF 1 extensions */                            \
 566                 .debug_srcinfo  0 : { *(.debug_srcinfo) }               \
 567                 .debug_sfnames  0 : { *(.debug_sfnames) }               \
 568                 /* DWARF 1.1 and DWARF 2 */                             \
 569                 .debug_aranges  0 : { *(.debug_aranges) }               \
 570                 .debug_pubnames 0 : { *(.debug_pubnames) }              \
 571                 /* DWARF 2 */                                           \
 572                 .debug_info     0 : { *(.debug_info                     \
 573                                 .gnu.linkonce.wi.*) }                   \
 574                 .debug_abbrev   0 : { *(.debug_abbrev) }                \
 575                 .debug_line     0 : { *(.debug_line) }                  \
 576                 .debug_frame    0 : { *(.debug_frame) }                 \
 577                 .debug_str      0 : { *(.debug_str) }                   \
 578                 .debug_loc      0 : { *(.debug_loc) }                   \
 579                 .debug_macinfo  0 : { *(.debug_macinfo) }               \
 580                 /* SGI/MIPS DWARF 2 extensions */                       \
 581                 .debug_weaknames 0 : { *(.debug_weaknames) }            \
 582                 .debug_funcnames 0 : { *(.debug_funcnames) }            \
 583                 .debug_typenames 0 : { *(.debug_typenames) }            \
 584                 .debug_varnames  0 : { *(.debug_varnames) }             \
 585
 586                 /* Stabs debugging sections.  */
 587 #define STABS_DEBUG                                                     \
 588                 .stab 0 : { *(.stab) }                                  \
 589                 .stabstr 0 : { *(.stabstr) }                            \
 590                 .stab.excl 0 : { *(.stab.excl) }                        \
 591                 .stab.exclstr 0 : { *(.stab.exclstr) }                  \
 592                 .stab.index 0 : { *(.stab.index) }                      \
 593                 .stab.indexstr 0 : { *(.stab.indexstr) }                \
 594                 .comment 0 : { *(.comment) }
 595
 596 #ifdef CONFIG_GENERIC_BUG
 597 #define BUG_TABLE                                                       \
 598         . = ALIGN(8);                                                   \
 599         __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {             \
 600                 VMLINUX_SYMBOL(__start___bug_table) = .;                \
 601                 *(__bug_table)                                          \
 602                 VMLINUX_SYMBOL(__stop___bug_table) = .;                 \
 603         }
 604 #else
 605 #define BUG_TABLE
 606 #endif
 607
 608 #ifdef CONFIG_PM_TRACE
 609 #define TRACEDATA                                                       \
 610         . = ALIGN(4);                                                   \
 611         .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {               \
 612                 VMLINUX_SYMBOL(__tracedata_start) = .;                  \
 613                 *(.tracedata)                                           \
 614                 VMLINUX_SYMBOL(__tracedata_end) = .;                    \
 615         }
 616 #else
 617 #define TRACEDATA
 618 #endif
 619
 620 #define NOTES                                                           \
 621         .notes : AT(ADDR(.notes) - LOAD_OFFSET) {                       \
 622                 VMLINUX_SYMBOL(__start_notes) = .;                      \
 623                 *(.note.*)                                              \
 624                 VMLINUX_SYMBOL(__stop_notes) = .;                       \
 625         }
 626
 627 #define INIT_SETUP(initsetup_align)                                     \
 628                 . = ALIGN(initsetup_align);                             \
 629                 VMLINUX_SYMBOL(__setup_start) = .;                      \
 630                 *(.init.setup)                                          \
 631                 VMLINUX_SYMBOL(__setup_end) = .;
 632
 633 #define INIT_CALLS_LEVEL(level)                                         \
 634                 VMLINUX_SYMBOL(__initcall##level##_start) = .;          \
 635                 *(.initcall##level##.init)                              \
 636                 *(.initcall##level##s.init)                             \
 637
 638 #define INIT_CALLS                                                      \
 639                 VMLINUX_SYMBOL(__initcall_start) = .;                   \
 640                 *(.initcallearly.init)                                  \
 641                 INIT_CALLS_LEVEL(0)                                     \
 642                 INIT_CALLS_LEVEL(1)                                     \
 643                 INIT_CALLS_LEVEL(2)                                     \
 644                 INIT_CALLS_LEVEL(3)                                     \
 645                 INIT_CALLS_LEVEL(4)                                     \
 646                 INIT_CALLS_LEVEL(5)                                     \
 647                 INIT_CALLS_LEVEL(rootfs)                                \
 648                 INIT_CALLS_LEVEL(6)                                     \
 649                 INIT_CALLS_LEVEL(7)                                     \
 650                 VMLINUX_SYMBOL(__initcall_end) = .;
 651
 652 #define CON_INITCALL                                                    \
 653                 VMLINUX_SYMBOL(__con_initcall_start) = .;               \
 654                 *(.con_initcall.init)                                   \
 655                 VMLINUX_SYMBOL(__con_initcall_end) = .;
 656
 657 #define SECURITY_INITCALL                                               \
 658                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 659                 *(.security_initcall.init)                              \
 660                 VMLINUX_SYMBOL(__security_initcall_end) = .;
 661
 662 #ifdef CONFIG_BLK_DEV_INITRD
 663 #define INIT_RAM_FS                                                     \
 664         . = ALIGN(4);                                                   \
 665         VMLINUX_SYMBOL(__initramfs_start) = .;                          \
 666         *(.init.ramfs)                                                  \
 667         . = ALIGN(8);                                                   \
 668         *(.init.ramfs.info)
 669 #else
 670 #define INIT_RAM_FS
 671 #endif
 672
 673 /*
 674  * Default discarded sections.
 675  *
 676  * Some archs want to discard exit text/data at runtime rather than
 677  * link time due to cross-section references such as alt instructions,
 678  * bug table, eh_frame, etc.  DISCARDS must be the last of output
 679  * section definitions so that such archs put those in earlier section
 680  * definitions.
 681  */
 682 #define DISCARDS                                                        \
 683         /DISCARD/ : {                                                   \
 684         EXIT_TEXT                                                       \
 685         EXIT_DATA                                                       \
 686         EXIT_CALL                                                       \
 687         *(.discard)                                                     \
 688         *(.discard.*)                                                   \
 689         }
 690
 691 /**
 692  * PERCPU_INPUT - the percpu input sections
 693  * @cacheline: cacheline size
 694  *
 695  * The core percpu section names and core symbols which do not rely
 696  * directly upon load addresses.
 697  *
 698  * @cacheline is used to align subsections to avoid false cacheline
 699  * sharing between subsections for different purposes.
 700  */
 701 #define PERCPU_INPUT(cacheline)                                         \
 702         VMLINUX_SYMBOL(__per_cpu_start) = .;                            \
 703         *(.data..percpu..first)                                         \
 704         . = ALIGN(PAGE_SIZE);                                           \
 705         *(.data..percpu..page_aligned)                                  \
 706         . = ALIGN(cacheline);                                           \
 707         *(.data..percpu..read_mostly)                                   \
 708         . = ALIGN(cacheline);                                           \
 709         *(.data..percpu)                                                \
 710         *(.data..percpu..shared_aligned)                                \
 711         VMLINUX_SYMBOL(__per_cpu_end) = .;
 712
 713 /**
 714  * PERCPU_VADDR - define output section for percpu area
 715  * @cacheline: cacheline size
 716  * @vaddr: explicit base address (optional)
 717  * @phdr: destination PHDR (optional)
 718  *
 719  * Macro which expands to output section for percpu area.
 720  *
 721  * @cacheline is used to align subsections to avoid false cacheline
 722  * sharing between subsections for different purposes.
 723  *
 724  * If @vaddr is not blank, it specifies explicit base address and all
 725  * percpu symbols will be offset from the given address.  If blank,
 726  * @vaddr always equals @laddr + LOAD_OFFSET.
 727  *
 728  * @phdr defines the output PHDR to use if not blank.  Be warned that
 729  * output PHDR is sticky.  If @phdr is specified, the next output
 730  * section in the linker script will go there too.  @phdr should have
 731  * a leading colon.
 732  *
 733  * Note that this macros defines __per_cpu_load as an absolute symbol.
 734  * If there is no need to put the percpu section at a predetermined
 735  * address, use PERCPU_SECTION.
 736  */
 737 #define PERCPU_VADDR(cacheline, vaddr, phdr)                            \
 738         VMLINUX_SYMBOL(__per_cpu_load) = .;                             \
 739         .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load)         \
 740                                 - LOAD_OFFSET) {                        \
 741                 PERCPU_INPUT(cacheline)                                 \
 742         } phdr                                                          \
 743         . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
 744
 745 /**
 746  * PERCPU_SECTION - define output section for percpu area, simple version
 747  * @cacheline: cacheline size
 748  *
 749  * Align to PAGE_SIZE and outputs output section for percpu area.  This
 750  * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
 751  * __per_cpu_start will be identical.
 752  *
 753  * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
 754  * except that __per_cpu_load is defined as a relative symbol against
 755  * .data..percpu which is required for relocatable x86_32 configuration.
 756  */
 757 #define PERCPU_SECTION(cacheline)                                       \
 758         . = ALIGN(PAGE_SIZE);                                           \
 759         .data..percpu   : AT(ADDR(.data..percpu) - LOAD_OFFSET) {       \
 760                 VMLINUX_SYMBOL(__per_cpu_load) = .;                     \
 761                 PERCPU_INPUT(cacheline)                                 \
 762         }
 763
 764
 765 /*
 766  * Definition of the high level *_SECTION macros
 767  * They will fit only a subset of the architectures
 768  */
 769
 770
 771 /*
 772  * Writeable data.
 773  * All sections are combined in a single .data section.
 774  * The sections following CONSTRUCTORS are arranged so their
 775  * typical alignment matches.
 776  * A cacheline is typical/always less than a PAGE_SIZE so
 777  * the sections that has this restriction (or similar)
 778  * is located before the ones requiring PAGE_SIZE alignment.
 779  * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
 780  * matches the requirement of PAGE_ALIGNED_DATA.
 781  *
 782  * use 0 as page_align if page_aligned data is not used */
 783 #define RW_DATA_SECTION(cacheline, pagealigned, inittask)               \
 784         . = ALIGN(PAGE_SIZE);                                           \
 785         .data : AT(ADDR(.data) - LOAD_OFFSET) {                         \
 786                 INIT_TASK_DATA(inittask)                                \
 787                 NOSAVE_DATA                                             \
 788                 PAGE_ALIGNED_DATA(pagealigned)                          \
 789                 CACHELINE_ALIGNED_DATA(cacheline)                       \
 790                 READ_MOSTLY_DATA(cacheline)                             \
 791                 DATA_DATA                                               \
 792                 CONSTRUCTORS                                            \
 793         }
 794
 795 #define INIT_TEXT_SECTION(inittext_align)                               \
 796         . = ALIGN(inittext_align);                                      \
 797         .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {               \
 798                 VMLINUX_SYMBOL(_sinittext) = .;                         \
 799                 INIT_TEXT                                               \
 800                 VMLINUX_SYMBOL(_einittext) = .;                         \
 801         }
 802
 803 #define INIT_DATA_SECTION(initsetup_align)                              \
 804         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {               \
 805                 INIT_DATA                                               \
 806                 INIT_SETUP(initsetup_align)                             \
 807                 INIT_CALLS                                              \
 808                 CON_INITCALL                                            \
 809                 SECURITY_INITCALL                                       \
 810                 INIT_RAM_FS                                             \
 811         }
 812
 813 #define BSS_SECTION(sbss_align, bss_align, stop_align)                  \
 814         . = ALIGN(sbss_align);                                          \
 815         VMLINUX_SYMBOL(__bss_start) = .;                                \
 816         SBSS(sbss_align)                                                \
 817         BSS(bss_align)                                                  \
 818         . = ALIGN(stop_align);                                          \
 819         VMLINUX_SYMBOL(__bss_stop) = .;