linux/include/asm-generic/vmlinux.lds.h
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   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#ifdef CONFIG_SERIAL_EARLYCON
 157#define EARLYCON_TABLE() STRUCT_ALIGN();                        \
 158                         VMLINUX_SYMBOL(__earlycon_table) = .;  \
 159                         *(__earlycon_table)                    \
 160                         VMLINUX_SYMBOL(__earlycon_table_end) = .;
 161#else
 162#define EARLYCON_TABLE()
 163#endif
 164
 165#define ___OF_TABLE(cfg, name)  _OF_TABLE_##cfg(name)
 166#define __OF_TABLE(cfg, name)   ___OF_TABLE(cfg, name)
 167#define OF_TABLE(cfg, name)     __OF_TABLE(config_enabled(cfg), name)
 168#define _OF_TABLE_0(name)
 169#define _OF_TABLE_1(name)                                               \
 170        . = ALIGN(8);                                                   \
 171        VMLINUX_SYMBOL(__##name##_of_table) = .;                        \
 172        *(__##name##_of_table)                                          \
 173        *(__##name##_of_table_end)
 174
 175#define CLKSRC_OF_TABLES()      OF_TABLE(CONFIG_CLKSRC_OF, clksrc)
 176#define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
 177#define CLK_OF_TABLES()         OF_TABLE(CONFIG_COMMON_CLK, clk)
 178#define IOMMU_OF_TABLES()       OF_TABLE(CONFIG_OF_IOMMU, iommu)
 179#define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
 180#define CPU_METHOD_OF_TABLES()  OF_TABLE(CONFIG_SMP, cpu_method)
 181#define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method)
 182
 183#ifdef CONFIG_ACPI
 184#define ACPI_PROBE_TABLE(name)                                          \
 185        . = ALIGN(8);                                                   \
 186        VMLINUX_SYMBOL(__##name##_acpi_probe_table) = .;                \
 187        *(__##name##_acpi_probe_table)                                  \
 188        VMLINUX_SYMBOL(__##name##_acpi_probe_table_end) = .;
 189#else
 190#define ACPI_PROBE_TABLE(name)
 191#endif
 192
 193#define KERNEL_DTB()                                                    \
 194        STRUCT_ALIGN();                                                 \
 195        VMLINUX_SYMBOL(__dtb_start) = .;                                \
 196        *(.dtb.init.rodata)                                             \
 197        VMLINUX_SYMBOL(__dtb_end) = .;
 198
 199/* .data section */
 200#define DATA_DATA                                                       \
 201        *(.data)                                                        \
 202        *(.ref.data)                                                    \
 203        *(.data..shared_aligned) /* percpu related */                   \
 204        MEM_KEEP(init.data)                                             \
 205        MEM_KEEP(exit.data)                                             \
 206        *(.data.unlikely)                                               \
 207        STRUCT_ALIGN();                                                 \
 208        *(__tracepoints)                                                \
 209        /* implement dynamic printk debug */                            \
 210        . = ALIGN(8);                                                   \
 211        VMLINUX_SYMBOL(__start___jump_table) = .;                       \
 212        *(__jump_table)                                                 \
 213        VMLINUX_SYMBOL(__stop___jump_table) = .;                        \
 214        . = ALIGN(8);                                                   \
 215        VMLINUX_SYMBOL(__start___verbose) = .;                          \
 216        *(__verbose)                                                    \
 217        VMLINUX_SYMBOL(__stop___verbose) = .;                           \
 218        LIKELY_PROFILE()                                                \
 219        BRANCH_PROFILE()                                                \
 220        TRACE_PRINTKS()                                                 \
 221        TRACEPOINT_STR()
 222
 223/*
 224 * Data section helpers
 225 */
 226#define NOSAVE_DATA                                                     \
 227        . = ALIGN(PAGE_SIZE);                                           \
 228        VMLINUX_SYMBOL(__nosave_begin) = .;                             \
 229        *(.data..nosave)                                                \
 230        . = ALIGN(PAGE_SIZE);                                           \
 231        VMLINUX_SYMBOL(__nosave_end) = .;
 232
 233#define PAGE_ALIGNED_DATA(page_align)                                   \
 234        . = ALIGN(page_align);                                          \
 235        *(.data..page_aligned)
 236
 237#define READ_MOSTLY_DATA(align)                                         \
 238        . = ALIGN(align);                                               \
 239        *(.data..read_mostly)                                           \
 240        . = ALIGN(align);
 241
 242#define CACHELINE_ALIGNED_DATA(align)                                   \
 243        . = ALIGN(align);                                               \
 244        *(.data..cacheline_aligned)
 245
 246#define INIT_TASK_DATA(align)                                           \
 247        . = ALIGN(align);                                               \
 248        *(.data..init_task)
 249
 250/*
 251 * Read only Data
 252 */
 253#define RO_DATA_SECTION(align)                                          \
 254        . = ALIGN((align));                                             \
 255        .rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {           \
 256                VMLINUX_SYMBOL(__start_rodata) = .;                     \
 257                *(.rodata) *(.rodata.*)                                 \
 258                *(.data..ro_after_init) /* Read only after init */      \
 259                *(__vermagic)           /* Kernel version magic */      \
 260                . = ALIGN(8);                                           \
 261                VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .;         \
 262                *(__tracepoints_ptrs)   /* Tracepoints: pointer array */\
 263                VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .;          \
 264                *(__tracepoints_strings)/* Tracepoints: strings */      \
 265        }                                                               \
 266                                                                        \
 267        .rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {          \
 268                *(.rodata1)                                             \
 269        }                                                               \
 270                                                                        \
 271        BUG_TABLE                                                       \
 272                                                                        \
 273        /* PCI quirks */                                                \
 274        .pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {        \
 275                VMLINUX_SYMBOL(__start_pci_fixups_early) = .;           \
 276                *(.pci_fixup_early)                                     \
 277                VMLINUX_SYMBOL(__end_pci_fixups_early) = .;             \
 278                VMLINUX_SYMBOL(__start_pci_fixups_header) = .;          \
 279                *(.pci_fixup_header)                                    \
 280                VMLINUX_SYMBOL(__end_pci_fixups_header) = .;            \
 281                VMLINUX_SYMBOL(__start_pci_fixups_final) = .;           \
 282                *(.pci_fixup_final)                                     \
 283                VMLINUX_SYMBOL(__end_pci_fixups_final) = .;             \
 284                VMLINUX_SYMBOL(__start_pci_fixups_enable) = .;          \
 285                *(.pci_fixup_enable)                                    \
 286                VMLINUX_SYMBOL(__end_pci_fixups_enable) = .;            \
 287                VMLINUX_SYMBOL(__start_pci_fixups_resume) = .;          \
 288                *(.pci_fixup_resume)                                    \
 289                VMLINUX_SYMBOL(__end_pci_fixups_resume) = .;            \
 290                VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .;    \
 291                *(.pci_fixup_resume_early)                              \
 292                VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .;      \
 293                VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .;         \
 294                *(.pci_fixup_suspend)                                   \
 295                VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .;           \
 296                VMLINUX_SYMBOL(__start_pci_fixups_suspend_late) = .;    \
 297                *(.pci_fixup_suspend_late)                              \
 298                VMLINUX_SYMBOL(__end_pci_fixups_suspend_late) = .;      \
 299        }                                                               \
 300                                                                        \
 301        /* Built-in firmware blobs */                                   \
 302        .builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {      \
 303                VMLINUX_SYMBOL(__start_builtin_fw) = .;                 \
 304                *(.builtin_fw)                                          \
 305                VMLINUX_SYMBOL(__end_builtin_fw) = .;                   \
 306        }                                                               \
 307                                                                        \
 308        TRACEDATA                                                       \
 309                                                                        \
 310        /* Kernel symbol table: Normal symbols */                       \
 311        __ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {         \
 312                VMLINUX_SYMBOL(__start___ksymtab) = .;                  \
 313                *(SORT(___ksymtab+*))                                   \
 314                VMLINUX_SYMBOL(__stop___ksymtab) = .;                   \
 315        }                                                               \
 316                                                                        \
 317        /* Kernel symbol table: GPL-only symbols */                     \
 318        __ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {     \
 319                VMLINUX_SYMBOL(__start___ksymtab_gpl) = .;              \
 320                *(SORT(___ksymtab_gpl+*))                               \
 321                VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .;               \
 322        }                                                               \
 323                                                                        \
 324        /* Kernel symbol table: Normal unused symbols */                \
 325        __ksymtab_unused  : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) {  \
 326                VMLINUX_SYMBOL(__start___ksymtab_unused) = .;           \
 327                *(SORT(___ksymtab_unused+*))                            \
 328                VMLINUX_SYMBOL(__stop___ksymtab_unused) = .;            \
 329        }                                                               \
 330                                                                        \
 331        /* Kernel symbol table: GPL-only unused symbols */              \
 332        __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
 333                VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .;       \
 334                *(SORT(___ksymtab_unused_gpl+*))                        \
 335                VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .;        \
 336        }                                                               \
 337                                                                        \
 338        /* Kernel symbol table: GPL-future-only symbols */              \
 339        __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
 340                VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .;       \
 341                *(SORT(___ksymtab_gpl_future+*))                        \
 342                VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .;        \
 343        }                                                               \
 344                                                                        \
 345        /* Kernel symbol table: Normal symbols */                       \
 346        __kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {         \
 347                VMLINUX_SYMBOL(__start___kcrctab) = .;                  \
 348                *(SORT(___kcrctab+*))                                   \
 349                VMLINUX_SYMBOL(__stop___kcrctab) = .;                   \
 350        }                                                               \
 351                                                                        \
 352        /* Kernel symbol table: GPL-only symbols */                     \
 353        __kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {     \
 354                VMLINUX_SYMBOL(__start___kcrctab_gpl) = .;              \
 355                *(SORT(___kcrctab_gpl+*))                               \
 356                VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .;               \
 357        }                                                               \
 358                                                                        \
 359        /* Kernel symbol table: Normal unused symbols */                \
 360        __kcrctab_unused  : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) {  \
 361                VMLINUX_SYMBOL(__start___kcrctab_unused) = .;           \
 362                *(SORT(___kcrctab_unused+*))                            \
 363                VMLINUX_SYMBOL(__stop___kcrctab_unused) = .;            \
 364        }                                                               \
 365                                                                        \
 366        /* Kernel symbol table: GPL-only unused symbols */              \
 367        __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
 368                VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .;       \
 369                *(SORT(___kcrctab_unused_gpl+*))                        \
 370                VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .;        \
 371        }                                                               \
 372                                                                        \
 373        /* Kernel symbol table: GPL-future-only symbols */              \
 374        __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
 375                VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .;       \
 376                *(SORT(___kcrctab_gpl_future+*))                        \
 377                VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .;        \
 378        }                                                               \
 379                                                                        \
 380        /* Kernel symbol table: strings */                              \
 381        __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
 382                *(__ksymtab_strings)                                    \
 383        }                                                               \
 384                                                                        \
 385        /* __*init sections */                                          \
 386        __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {         \
 387                *(.ref.rodata)                                          \
 388                MEM_KEEP(init.rodata)                                   \
 389                MEM_KEEP(exit.rodata)                                   \
 390        }                                                               \
 391                                                                        \
 392        /* Built-in module parameters. */                               \
 393        __param : AT(ADDR(__param) - LOAD_OFFSET) {                     \
 394                VMLINUX_SYMBOL(__start___param) = .;                    \
 395                *(__param)                                              \
 396                VMLINUX_SYMBOL(__stop___param) = .;                     \
 397        }                                                               \
 398                                                                        \
 399        /* Built-in module versions. */                                 \
 400        __modver : AT(ADDR(__modver) - LOAD_OFFSET) {                   \
 401                VMLINUX_SYMBOL(__start___modver) = .;                   \
 402                *(__modver)                                             \
 403                VMLINUX_SYMBOL(__stop___modver) = .;                    \
 404                . = ALIGN((align));                                     \
 405                VMLINUX_SYMBOL(__end_rodata) = .;                       \
 406        }                                                               \
 407        . = ALIGN((align));
 408
 409/* RODATA & RO_DATA provided for backward compatibility.
 410 * All archs are supposed to use RO_DATA() */
 411#define RODATA          RO_DATA_SECTION(4096)
 412#define RO_DATA(align)  RO_DATA_SECTION(align)
 413
 414#define SECURITY_INIT                                                   \
 415        .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
 416                VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 417                *(.security_initcall.init)                              \
 418                VMLINUX_SYMBOL(__security_initcall_end) = .;            \
 419        }
 420
 421/* .text section. Map to function alignment to avoid address changes
 422 * during second ld run in second ld pass when generating System.map */
 423#define TEXT_TEXT                                                       \
 424                ALIGN_FUNCTION();                                       \
 425                *(.text.hot .text .text.fixup .text.unlikely)           \
 426                *(.ref.text)                                            \
 427        MEM_KEEP(init.text)                                             \
 428        MEM_KEEP(exit.text)                                             \
 429
 430
 431/* sched.text is aling to function alignment to secure we have same
 432 * address even at second ld pass when generating System.map */
 433#define SCHED_TEXT                                                      \
 434                ALIGN_FUNCTION();                                       \
 435                VMLINUX_SYMBOL(__sched_text_start) = .;                 \
 436                *(.sched.text)                                          \
 437                VMLINUX_SYMBOL(__sched_text_end) = .;
 438
 439/* spinlock.text is aling to function alignment to secure we have same
 440 * address even at second ld pass when generating System.map */
 441#define LOCK_TEXT                                                       \
 442                ALIGN_FUNCTION();                                       \
 443                VMLINUX_SYMBOL(__lock_text_start) = .;                  \
 444                *(.spinlock.text)                                       \
 445                VMLINUX_SYMBOL(__lock_text_end) = .;
 446
 447#define KPROBES_TEXT                                                    \
 448                ALIGN_FUNCTION();                                       \
 449                VMLINUX_SYMBOL(__kprobes_text_start) = .;               \
 450                *(.kprobes.text)                                        \
 451                VMLINUX_SYMBOL(__kprobes_text_end) = .;
 452
 453#define ENTRY_TEXT                                                      \
 454                ALIGN_FUNCTION();                                       \
 455                VMLINUX_SYMBOL(__entry_text_start) = .;                 \
 456                *(.entry.text)                                          \
 457                VMLINUX_SYMBOL(__entry_text_end) = .;
 458
 459#if defined(CONFIG_FUNCTION_GRAPH_TRACER) || defined(CONFIG_KASAN)
 460#define IRQENTRY_TEXT                                                   \
 461                ALIGN_FUNCTION();                                       \
 462                VMLINUX_SYMBOL(__irqentry_text_start) = .;              \
 463                *(.irqentry.text)                                       \
 464                VMLINUX_SYMBOL(__irqentry_text_end) = .;
 465#else
 466#define IRQENTRY_TEXT
 467#endif
 468
 469#if defined(CONFIG_FUNCTION_GRAPH_TRACER) || defined(CONFIG_KASAN)
 470#define SOFTIRQENTRY_TEXT                                               \
 471                ALIGN_FUNCTION();                                       \
 472                VMLINUX_SYMBOL(__softirqentry_text_start) = .;          \
 473                *(.softirqentry.text)                                   \
 474                VMLINUX_SYMBOL(__softirqentry_text_end) = .;
 475#else
 476#define SOFTIRQENTRY_TEXT
 477#endif
 478
 479/* Section used for early init (in .S files) */
 480#define HEAD_TEXT  *(.head.text)
 481
 482#define HEAD_TEXT_SECTION                                                       \
 483        .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {               \
 484                HEAD_TEXT                                               \
 485        }
 486
 487/*
 488 * Exception table
 489 */
 490#define EXCEPTION_TABLE(align)                                          \
 491        . = ALIGN(align);                                               \
 492        __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {               \
 493                VMLINUX_SYMBOL(__start___ex_table) = .;                 \
 494                *(__ex_table)                                           \
 495                VMLINUX_SYMBOL(__stop___ex_table) = .;                  \
 496        }
 497
 498/*
 499 * Init task
 500 */
 501#define INIT_TASK_DATA_SECTION(align)                                   \
 502        . = ALIGN(align);                                               \
 503        .data..init_task :  AT(ADDR(.data..init_task) - LOAD_OFFSET) {  \
 504                INIT_TASK_DATA(align)                                   \
 505        }
 506
 507#ifdef CONFIG_CONSTRUCTORS
 508#define KERNEL_CTORS()  . = ALIGN(8);                      \
 509                        VMLINUX_SYMBOL(__ctors_start) = .; \
 510                        *(.ctors)                          \
 511                        *(SORT(.init_array.*))             \
 512                        *(.init_array)                     \
 513                        VMLINUX_SYMBOL(__ctors_end) = .;
 514#else
 515#define KERNEL_CTORS()
 516#endif
 517
 518/* init and exit section handling */
 519#define INIT_DATA                                                       \
 520        *(.init.data)                                                   \
 521        MEM_DISCARD(init.data)                                          \
 522        KERNEL_CTORS()                                                  \
 523        MCOUNT_REC()                                                    \
 524        *(.init.rodata)                                                 \
 525        FTRACE_EVENTS()                                                 \
 526        TRACE_SYSCALLS()                                                \
 527        KPROBE_BLACKLIST()                                              \
 528        MEM_DISCARD(init.rodata)                                        \
 529        CLK_OF_TABLES()                                                 \
 530        RESERVEDMEM_OF_TABLES()                                         \
 531        CLKSRC_OF_TABLES()                                              \
 532        IOMMU_OF_TABLES()                                               \
 533        CPU_METHOD_OF_TABLES()                                          \
 534        CPUIDLE_METHOD_OF_TABLES()                                      \
 535        KERNEL_DTB()                                                    \
 536        IRQCHIP_OF_MATCH_TABLE()                                        \
 537        ACPI_PROBE_TABLE(irqchip)                                       \
 538        ACPI_PROBE_TABLE(clksrc)                                        \
 539        EARLYCON_TABLE()
 540
 541#define INIT_TEXT                                                       \
 542        *(.init.text)                                                   \
 543        MEM_DISCARD(init.text)
 544
 545#define EXIT_DATA                                                       \
 546        *(.exit.data)                                                   \
 547        MEM_DISCARD(exit.data)                                          \
 548        MEM_DISCARD(exit.rodata)
 549
 550#define EXIT_TEXT                                                       \
 551        *(.exit.text)                                                   \
 552        MEM_DISCARD(exit.text)
 553
 554#define EXIT_CALL                                                       \
 555        *(.exitcall.exit)
 556
 557/*
 558 * bss (Block Started by Symbol) - uninitialized data
 559 * zeroed during startup
 560 */
 561#define SBSS(sbss_align)                                                \
 562        . = ALIGN(sbss_align);                                          \
 563        .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {                         \
 564                *(.sbss)                                                \
 565                *(.scommon)                                             \
 566        }
 567
 568/*
 569 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
 570 * sections to the front of bss.
 571 */
 572#ifndef BSS_FIRST_SECTIONS
 573#define BSS_FIRST_SECTIONS
 574#endif
 575
 576#define BSS(bss_align)                                                  \
 577        . = ALIGN(bss_align);                                           \
 578        .bss : AT(ADDR(.bss) - LOAD_OFFSET) {                           \
 579                BSS_FIRST_SECTIONS                                      \
 580                *(.bss..page_aligned)                                   \
 581                *(.dynbss)                                              \
 582                *(.bss)                                                 \
 583                *(COMMON)                                               \
 584        }
 585
 586/*
 587 * DWARF debug sections.
 588 * Symbols in the DWARF debugging sections are relative to
 589 * the beginning of the section so we begin them at 0.
 590 */
 591#define DWARF_DEBUG                                                     \
 592                /* DWARF 1 */                                           \
 593                .debug          0 : { *(.debug) }                       \
 594                .line           0 : { *(.line) }                        \
 595                /* GNU DWARF 1 extensions */                            \
 596                .debug_srcinfo  0 : { *(.debug_srcinfo) }               \
 597                .debug_sfnames  0 : { *(.debug_sfnames) }               \
 598                /* DWARF 1.1 and DWARF 2 */                             \
 599                .debug_aranges  0 : { *(.debug_aranges) }               \
 600                .debug_pubnames 0 : { *(.debug_pubnames) }              \
 601                /* DWARF 2 */                                           \
 602                .debug_info     0 : { *(.debug_info                     \
 603                                .gnu.linkonce.wi.*) }                   \
 604                .debug_abbrev   0 : { *(.debug_abbrev) }                \
 605                .debug_line     0 : { *(.debug_line) }                  \
 606                .debug_frame    0 : { *(.debug_frame) }                 \
 607                .debug_str      0 : { *(.debug_str) }                   \
 608                .debug_loc      0 : { *(.debug_loc) }                   \
 609                .debug_macinfo  0 : { *(.debug_macinfo) }               \
 610                /* SGI/MIPS DWARF 2 extensions */                       \
 611                .debug_weaknames 0 : { *(.debug_weaknames) }            \
 612                .debug_funcnames 0 : { *(.debug_funcnames) }            \
 613                .debug_typenames 0 : { *(.debug_typenames) }            \
 614                .debug_varnames  0 : { *(.debug_varnames) }             \
 615
 616                /* Stabs debugging sections.  */
 617#define STABS_DEBUG                                                     \
 618                .stab 0 : { *(.stab) }                                  \
 619                .stabstr 0 : { *(.stabstr) }                            \
 620                .stab.excl 0 : { *(.stab.excl) }                        \
 621                .stab.exclstr 0 : { *(.stab.exclstr) }                  \
 622                .stab.index 0 : { *(.stab.index) }                      \
 623                .stab.indexstr 0 : { *(.stab.indexstr) }                \
 624                .comment 0 : { *(.comment) }
 625
 626#ifdef CONFIG_GENERIC_BUG
 627#define BUG_TABLE                                                       \
 628        . = ALIGN(8);                                                   \
 629        __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {             \
 630                VMLINUX_SYMBOL(__start___bug_table) = .;                \
 631                *(__bug_table)                                          \
 632                VMLINUX_SYMBOL(__stop___bug_table) = .;                 \
 633        }
 634#else
 635#define BUG_TABLE
 636#endif
 637
 638#ifdef CONFIG_PM_TRACE
 639#define TRACEDATA                                                       \
 640        . = ALIGN(4);                                                   \
 641        .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {               \
 642                VMLINUX_SYMBOL(__tracedata_start) = .;                  \
 643                *(.tracedata)                                           \
 644                VMLINUX_SYMBOL(__tracedata_end) = .;                    \
 645        }
 646#else
 647#define TRACEDATA
 648#endif
 649
 650#define NOTES                                                           \
 651        .notes : AT(ADDR(.notes) - LOAD_OFFSET) {                       \
 652                VMLINUX_SYMBOL(__start_notes) = .;                      \
 653                *(.note.*)                                              \
 654                VMLINUX_SYMBOL(__stop_notes) = .;                       \
 655        }
 656
 657#define INIT_SETUP(initsetup_align)                                     \
 658                . = ALIGN(initsetup_align);                             \
 659                VMLINUX_SYMBOL(__setup_start) = .;                      \
 660                *(.init.setup)                                          \
 661                VMLINUX_SYMBOL(__setup_end) = .;
 662
 663#define INIT_CALLS_LEVEL(level)                                         \
 664                VMLINUX_SYMBOL(__initcall##level##_start) = .;          \
 665                *(.initcall##level##.init)                              \
 666                *(.initcall##level##s.init)                             \
 667
 668#define INIT_CALLS                                                      \
 669                VMLINUX_SYMBOL(__initcall_start) = .;                   \
 670                *(.initcallearly.init)                                  \
 671                INIT_CALLS_LEVEL(0)                                     \
 672                INIT_CALLS_LEVEL(1)                                     \
 673                INIT_CALLS_LEVEL(2)                                     \
 674                INIT_CALLS_LEVEL(3)                                     \
 675                INIT_CALLS_LEVEL(4)                                     \
 676                INIT_CALLS_LEVEL(5)                                     \
 677                INIT_CALLS_LEVEL(rootfs)                                \
 678                INIT_CALLS_LEVEL(6)                                     \
 679                INIT_CALLS_LEVEL(7)                                     \
 680                VMLINUX_SYMBOL(__initcall_end) = .;
 681
 682#define CON_INITCALL                                                    \
 683                VMLINUX_SYMBOL(__con_initcall_start) = .;               \
 684                *(.con_initcall.init)                                   \
 685                VMLINUX_SYMBOL(__con_initcall_end) = .;
 686
 687#define SECURITY_INITCALL                                               \
 688                VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 689                *(.security_initcall.init)                              \
 690                VMLINUX_SYMBOL(__security_initcall_end) = .;
 691
 692#ifdef CONFIG_BLK_DEV_INITRD
 693#define INIT_RAM_FS                                                     \
 694        . = ALIGN(4);                                                   \
 695        VMLINUX_SYMBOL(__initramfs_start) = .;                          \
 696        *(.init.ramfs)                                                  \
 697        . = ALIGN(8);                                                   \
 698        *(.init.ramfs.info)
 699#else
 700#define INIT_RAM_FS
 701#endif
 702
 703/*
 704 * Default discarded sections.
 705 *
 706 * Some archs want to discard exit text/data at runtime rather than
 707 * link time due to cross-section references such as alt instructions,
 708 * bug table, eh_frame, etc.  DISCARDS must be the last of output
 709 * section definitions so that such archs put those in earlier section
 710 * definitions.
 711 */
 712#define DISCARDS                                                        \
 713        /DISCARD/ : {                                                   \
 714        EXIT_TEXT                                                       \
 715        EXIT_DATA                                                       \
 716        EXIT_CALL                                                       \
 717        *(.discard)                                                     \
 718        *(.discard.*)                                                   \
 719        }
 720
 721/**
 722 * PERCPU_INPUT - the percpu input sections
 723 * @cacheline: cacheline size
 724 *
 725 * The core percpu section names and core symbols which do not rely
 726 * directly upon load addresses.
 727 *
 728 * @cacheline is used to align subsections to avoid false cacheline
 729 * sharing between subsections for different purposes.
 730 */
 731#define PERCPU_INPUT(cacheline)                                         \
 732        VMLINUX_SYMBOL(__per_cpu_start) = .;                            \
 733        *(.data..percpu..first)                                         \
 734        . = ALIGN(PAGE_SIZE);                                           \
 735        *(.data..percpu..page_aligned)                                  \
 736        . = ALIGN(cacheline);                                           \
 737        *(.data..percpu..read_mostly)                                   \
 738        . = ALIGN(cacheline);                                           \
 739        *(.data..percpu)                                                \
 740        *(.data..percpu..shared_aligned)                                \
 741        VMLINUX_SYMBOL(__per_cpu_end) = .;
 742
 743/**
 744 * PERCPU_VADDR - define output section for percpu area
 745 * @cacheline: cacheline size
 746 * @vaddr: explicit base address (optional)
 747 * @phdr: destination PHDR (optional)
 748 *
 749 * Macro which expands to output section for percpu area.
 750 *
 751 * @cacheline is used to align subsections to avoid false cacheline
 752 * sharing between subsections for different purposes.
 753 *
 754 * If @vaddr is not blank, it specifies explicit base address and all
 755 * percpu symbols will be offset from the given address.  If blank,
 756 * @vaddr always equals @laddr + LOAD_OFFSET.
 757 *
 758 * @phdr defines the output PHDR to use if not blank.  Be warned that
 759 * output PHDR is sticky.  If @phdr is specified, the next output
 760 * section in the linker script will go there too.  @phdr should have
 761 * a leading colon.
 762 *
 763 * Note that this macros defines __per_cpu_load as an absolute symbol.
 764 * If there is no need to put the percpu section at a predetermined
 765 * address, use PERCPU_SECTION.
 766 */
 767#define PERCPU_VADDR(cacheline, vaddr, phdr)                            \
 768        VMLINUX_SYMBOL(__per_cpu_load) = .;                             \
 769        .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load)         \
 770                                - LOAD_OFFSET) {                        \
 771                PERCPU_INPUT(cacheline)                                 \
 772        } phdr                                                          \
 773        . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
 774
 775/**
 776 * PERCPU_SECTION - define output section for percpu area, simple version
 777 * @cacheline: cacheline size
 778 *
 779 * Align to PAGE_SIZE and outputs output section for percpu area.  This
 780 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
 781 * __per_cpu_start will be identical.
 782 *
 783 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
 784 * except that __per_cpu_load is defined as a relative symbol against
 785 * .data..percpu which is required for relocatable x86_32 configuration.
 786 */
 787#define PERCPU_SECTION(cacheline)                                       \
 788        . = ALIGN(PAGE_SIZE);                                           \
 789        .data..percpu   : AT(ADDR(.data..percpu) - LOAD_OFFSET) {       \
 790                VMLINUX_SYMBOL(__per_cpu_load) = .;                     \
 791                PERCPU_INPUT(cacheline)                                 \
 792        }
 793
 794
 795/*
 796 * Definition of the high level *_SECTION macros
 797 * They will fit only a subset of the architectures
 798 */
 799
 800
 801/*
 802 * Writeable data.
 803 * All sections are combined in a single .data section.
 804 * The sections following CONSTRUCTORS are arranged so their
 805 * typical alignment matches.
 806 * A cacheline is typical/always less than a PAGE_SIZE so
 807 * the sections that has this restriction (or similar)
 808 * is located before the ones requiring PAGE_SIZE alignment.
 809 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
 810 * matches the requirement of PAGE_ALIGNED_DATA.
 811 *
 812 * use 0 as page_align if page_aligned data is not used */
 813#define RW_DATA_SECTION(cacheline, pagealigned, inittask)               \
 814        . = ALIGN(PAGE_SIZE);                                           \
 815        .data : AT(ADDR(.data) - LOAD_OFFSET) {                         \
 816                INIT_TASK_DATA(inittask)                                \
 817                NOSAVE_DATA                                             \
 818                PAGE_ALIGNED_DATA(pagealigned)                          \
 819                CACHELINE_ALIGNED_DATA(cacheline)                       \
 820                READ_MOSTLY_DATA(cacheline)                             \
 821                DATA_DATA                                               \
 822                CONSTRUCTORS                                            \
 823        }
 824
 825#define INIT_TEXT_SECTION(inittext_align)                               \
 826        . = ALIGN(inittext_align);                                      \
 827        .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {               \
 828                VMLINUX_SYMBOL(_sinittext) = .;                         \
 829                INIT_TEXT                                               \
 830                VMLINUX_SYMBOL(_einittext) = .;                         \
 831        }
 832
 833#define INIT_DATA_SECTION(initsetup_align)                              \
 834        .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {               \
 835                INIT_DATA                                               \
 836                INIT_SETUP(initsetup_align)                             \
 837                INIT_CALLS                                              \
 838                CON_INITCALL                                            \
 839                SECURITY_INITCALL                                       \
 840                INIT_RAM_FS                                             \
 841        }
 842
 843#define BSS_SECTION(sbss_align, bss_align, stop_align)                  \
 844        . = ALIGN(sbss_align);                                          \
 845        VMLINUX_SYMBOL(__bss_start) = .;                                \
 846        SBSS(sbss_align)                                                \
 847        BSS(bss_align)                                                  \
 848        . = ALIGN(stop_align);                                          \
 849        VMLINUX_SYMBOL(__bss_stop) = .;
 850