linux/include/asm-generic/vmlinux.lds.h
<<
>>
Prefs
   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/* Align . to a 8 byte boundary equals to maximum function alignment. */
  58#define ALIGN_FUNCTION()  . = ALIGN(8)
  59
  60/*
  61 * LD_DEAD_CODE_DATA_ELIMINATION option enables -fdata-sections, which
  62 * generates .data.identifier sections, which need to be pulled in with
  63 * .data. We don't want to pull in .data..other sections, which Linux
  64 * has defined. Same for text and bss.
  65 *
  66 * RODATA_MAIN is not used because existing code already defines .rodata.x
  67 * sections to be brought in with rodata.
  68 */
  69#ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
  70#define TEXT_MAIN .text .text.[0-9a-zA-Z_]*
  71#define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..LPBX*
  72#define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]*
  73#define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]*
  74#define BSS_MAIN .bss .bss.[0-9a-zA-Z_]*
  75#define SBSS_MAIN .sbss .sbss.[0-9a-zA-Z_]*
  76#else
  77#define TEXT_MAIN .text
  78#define DATA_MAIN .data
  79#define SDATA_MAIN .sdata
  80#define RODATA_MAIN .rodata
  81#define BSS_MAIN .bss
  82#define SBSS_MAIN .sbss
  83#endif
  84
  85/*
  86 * Align to a 32 byte boundary equal to the
  87 * alignment gcc 4.5 uses for a struct
  88 */
  89#define STRUCT_ALIGNMENT 32
  90#define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
  91
  92/* The actual configuration determine if the init/exit sections
  93 * are handled as text/data or they can be discarded (which
  94 * often happens at runtime)
  95 */
  96#ifdef CONFIG_HOTPLUG_CPU
  97#define CPU_KEEP(sec)    *(.cpu##sec)
  98#define CPU_DISCARD(sec)
  99#else
 100#define CPU_KEEP(sec)
 101#define CPU_DISCARD(sec) *(.cpu##sec)
 102#endif
 103
 104#if defined(CONFIG_MEMORY_HOTPLUG)
 105#define MEM_KEEP(sec)    *(.mem##sec)
 106#define MEM_DISCARD(sec)
 107#else
 108#define MEM_KEEP(sec)
 109#define MEM_DISCARD(sec) *(.mem##sec)
 110#endif
 111
 112#ifdef CONFIG_FTRACE_MCOUNT_RECORD
 113#ifdef CC_USING_PATCHABLE_FUNCTION_ENTRY
 114#define MCOUNT_REC()    . = ALIGN(8);                           \
 115                        __start_mcount_loc = .;                 \
 116                        KEEP(*(__patchable_function_entries))   \
 117                        __stop_mcount_loc = .;
 118#else
 119#define MCOUNT_REC()    . = ALIGN(8);                           \
 120                        __start_mcount_loc = .;                 \
 121                        KEEP(*(__mcount_loc))                   \
 122                        __stop_mcount_loc = .;
 123#endif
 124#else
 125#define MCOUNT_REC()
 126#endif
 127
 128#ifdef CONFIG_TRACE_BRANCH_PROFILING
 129#define LIKELY_PROFILE()        __start_annotated_branch_profile = .;   \
 130                                KEEP(*(_ftrace_annotated_branch))       \
 131                                __stop_annotated_branch_profile = .;
 132#else
 133#define LIKELY_PROFILE()
 134#endif
 135
 136#ifdef CONFIG_PROFILE_ALL_BRANCHES
 137#define BRANCH_PROFILE()        __start_branch_profile = .;             \
 138                                KEEP(*(_ftrace_branch))                 \
 139                                __stop_branch_profile = .;
 140#else
 141#define BRANCH_PROFILE()
 142#endif
 143
 144#ifdef CONFIG_KPROBES
 145#define KPROBE_BLACKLIST()      . = ALIGN(8);                                 \
 146                                __start_kprobe_blacklist = .;                 \
 147                                KEEP(*(_kprobe_blacklist))                    \
 148                                __stop_kprobe_blacklist = .;
 149#else
 150#define KPROBE_BLACKLIST()
 151#endif
 152
 153#ifdef CONFIG_FUNCTION_ERROR_INJECTION
 154#define ERROR_INJECT_WHITELIST()        STRUCT_ALIGN();                       \
 155                        __start_error_injection_whitelist = .;                \
 156                        KEEP(*(_error_injection_whitelist))                   \
 157                        __stop_error_injection_whitelist = .;
 158#else
 159#define ERROR_INJECT_WHITELIST()
 160#endif
 161
 162#ifdef CONFIG_EVENT_TRACING
 163#define FTRACE_EVENTS() . = ALIGN(8);                                   \
 164                        __start_ftrace_events = .;                      \
 165                        KEEP(*(_ftrace_events))                         \
 166                        __stop_ftrace_events = .;                       \
 167                        __start_ftrace_eval_maps = .;                   \
 168                        KEEP(*(_ftrace_eval_map))                       \
 169                        __stop_ftrace_eval_maps = .;
 170#else
 171#define FTRACE_EVENTS()
 172#endif
 173
 174#ifdef CONFIG_TRACING
 175#define TRACE_PRINTKS()  __start___trace_bprintk_fmt = .;      \
 176                         KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \
 177                         __stop___trace_bprintk_fmt = .;
 178#define TRACEPOINT_STR() __start___tracepoint_str = .;  \
 179                         KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \
 180                         __stop___tracepoint_str = .;
 181#else
 182#define TRACE_PRINTKS()
 183#define TRACEPOINT_STR()
 184#endif
 185
 186#ifdef CONFIG_FTRACE_SYSCALLS
 187#define TRACE_SYSCALLS() . = ALIGN(8);                                  \
 188                         __start_syscalls_metadata = .;                 \
 189                         KEEP(*(__syscalls_metadata))                   \
 190                         __stop_syscalls_metadata = .;
 191#else
 192#define TRACE_SYSCALLS()
 193#endif
 194
 195#ifdef CONFIG_BPF_EVENTS
 196#define BPF_RAW_TP() STRUCT_ALIGN();                                    \
 197                         __start__bpf_raw_tp = .;                       \
 198                         KEEP(*(__bpf_raw_tp_map))                      \
 199                         __stop__bpf_raw_tp = .;
 200#else
 201#define BPF_RAW_TP()
 202#endif
 203
 204#ifdef CONFIG_SERIAL_EARLYCON
 205#define EARLYCON_TABLE() . = ALIGN(8);                          \
 206                         __earlycon_table = .;                  \
 207                         KEEP(*(__earlycon_table))              \
 208                         __earlycon_table_end = .;
 209#else
 210#define EARLYCON_TABLE()
 211#endif
 212
 213#ifdef CONFIG_SECURITY
 214#define LSM_TABLE()     . = ALIGN(8);                                   \
 215                        __start_lsm_info = .;                           \
 216                        KEEP(*(.lsm_info.init))                         \
 217                        __end_lsm_info = .;
 218#define EARLY_LSM_TABLE()       . = ALIGN(8);                           \
 219                        __start_early_lsm_info = .;                     \
 220                        KEEP(*(.early_lsm_info.init))                   \
 221                        __end_early_lsm_info = .;
 222#else
 223#define LSM_TABLE()
 224#define EARLY_LSM_TABLE()
 225#endif
 226
 227#define ___OF_TABLE(cfg, name)  _OF_TABLE_##cfg(name)
 228#define __OF_TABLE(cfg, name)   ___OF_TABLE(cfg, name)
 229#define OF_TABLE(cfg, name)     __OF_TABLE(IS_ENABLED(cfg), name)
 230#define _OF_TABLE_0(name)
 231#define _OF_TABLE_1(name)                                               \
 232        . = ALIGN(8);                                                   \
 233        __##name##_of_table = .;                                        \
 234        KEEP(*(__##name##_of_table))                                    \
 235        KEEP(*(__##name##_of_table_end))
 236
 237#define TIMER_OF_TABLES()       OF_TABLE(CONFIG_TIMER_OF, timer)
 238#define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
 239#define CLK_OF_TABLES()         OF_TABLE(CONFIG_COMMON_CLK, clk)
 240#define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
 241#define CPU_METHOD_OF_TABLES()  OF_TABLE(CONFIG_SMP, cpu_method)
 242#define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method)
 243
 244#ifdef CONFIG_ACPI
 245#define ACPI_PROBE_TABLE(name)                                          \
 246        . = ALIGN(8);                                                   \
 247        __##name##_acpi_probe_table = .;                                \
 248        KEEP(*(__##name##_acpi_probe_table))                            \
 249        __##name##_acpi_probe_table_end = .;
 250#else
 251#define ACPI_PROBE_TABLE(name)
 252#endif
 253
 254#ifdef CONFIG_THERMAL
 255#define THERMAL_TABLE(name)                                             \
 256        . = ALIGN(8);                                                   \
 257        __##name##_thermal_table = .;                                   \
 258        KEEP(*(__##name##_thermal_table))                               \
 259        __##name##_thermal_table_end = .;
 260#else
 261#define THERMAL_TABLE(name)
 262#endif
 263
 264#define KERNEL_DTB()                                                    \
 265        STRUCT_ALIGN();                                                 \
 266        __dtb_start = .;                                                \
 267        KEEP(*(.dtb.init.rodata))                                       \
 268        __dtb_end = .;
 269
 270/*
 271 * .data section
 272 */
 273#define DATA_DATA                                                       \
 274        *(.xiptext)                                                     \
 275        *(DATA_MAIN)                                                    \
 276        *(.ref.data)                                                    \
 277        *(.data..shared_aligned) /* percpu related */                   \
 278        MEM_KEEP(init.data*)                                            \
 279        MEM_KEEP(exit.data*)                                            \
 280        *(.data.unlikely)                                               \
 281        __start_once = .;                                               \
 282        *(.data.once)                                                   \
 283        __end_once = .;                                                 \
 284        STRUCT_ALIGN();                                                 \
 285        *(__tracepoints)                                                \
 286        /* implement dynamic printk debug */                            \
 287        . = ALIGN(8);                                                   \
 288        __start___verbose = .;                                          \
 289        KEEP(*(__verbose))                                              \
 290        __stop___verbose = .;                                           \
 291        LIKELY_PROFILE()                                                \
 292        BRANCH_PROFILE()                                                \
 293        TRACE_PRINTKS()                                                 \
 294        BPF_RAW_TP()                                                    \
 295        TRACEPOINT_STR()
 296
 297/*
 298 * Data section helpers
 299 */
 300#define NOSAVE_DATA                                                     \
 301        . = ALIGN(PAGE_SIZE);                                           \
 302        __nosave_begin = .;                                             \
 303        *(.data..nosave)                                                \
 304        . = ALIGN(PAGE_SIZE);                                           \
 305        __nosave_end = .;
 306
 307#define PAGE_ALIGNED_DATA(page_align)                                   \
 308        . = ALIGN(page_align);                                          \
 309        *(.data..page_aligned)
 310
 311#define READ_MOSTLY_DATA(align)                                         \
 312        . = ALIGN(align);                                               \
 313        *(.data..read_mostly)                                           \
 314        . = ALIGN(align);
 315
 316#define CACHELINE_ALIGNED_DATA(align)                                   \
 317        . = ALIGN(align);                                               \
 318        *(.data..cacheline_aligned)
 319
 320#define INIT_TASK_DATA(align)                                           \
 321        . = ALIGN(align);                                               \
 322        __start_init_task = .;                                          \
 323        init_thread_union = .;                                          \
 324        init_stack = .;                                                 \
 325        KEEP(*(.data..init_task))                                       \
 326        KEEP(*(.data..init_thread_info))                                \
 327        . = __start_init_task + THREAD_SIZE;                            \
 328        __end_init_task = .;
 329
 330#define JUMP_TABLE_DATA                                                 \
 331        . = ALIGN(8);                                                   \
 332        __start___jump_table = .;                                       \
 333        KEEP(*(__jump_table))                                           \
 334        __stop___jump_table = .;
 335
 336/*
 337 * Allow architectures to handle ro_after_init data on their
 338 * own by defining an empty RO_AFTER_INIT_DATA.
 339 */
 340#ifndef RO_AFTER_INIT_DATA
 341#define RO_AFTER_INIT_DATA                                              \
 342        __start_ro_after_init = .;                                      \
 343        *(.data..ro_after_init)                                         \
 344        JUMP_TABLE_DATA                                                 \
 345        __end_ro_after_init = .;
 346#endif
 347
 348/*
 349 * Read only Data
 350 */
 351#define RO_DATA_SECTION(align)                                          \
 352        . = ALIGN((align));                                             \
 353        .rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {           \
 354                __start_rodata = .;                                     \
 355                *(.rodata) *(.rodata.*)                                 \
 356                RO_AFTER_INIT_DATA      /* Read only after init */      \
 357                . = ALIGN(8);                                           \
 358                __start___tracepoints_ptrs = .;                         \
 359                KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \
 360                __stop___tracepoints_ptrs = .;                          \
 361                *(__tracepoints_strings)/* Tracepoints: strings */      \
 362        }                                                               \
 363                                                                        \
 364        .rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {          \
 365                *(.rodata1)                                             \
 366        }                                                               \
 367                                                                        \
 368        /* PCI quirks */                                                \
 369        .pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {        \
 370                __start_pci_fixups_early = .;                           \
 371                KEEP(*(.pci_fixup_early))                               \
 372                __end_pci_fixups_early = .;                             \
 373                __start_pci_fixups_header = .;                          \
 374                KEEP(*(.pci_fixup_header))                              \
 375                __end_pci_fixups_header = .;                            \
 376                __start_pci_fixups_final = .;                           \
 377                KEEP(*(.pci_fixup_final))                               \
 378                __end_pci_fixups_final = .;                             \
 379                __start_pci_fixups_enable = .;                          \
 380                KEEP(*(.pci_fixup_enable))                              \
 381                __end_pci_fixups_enable = .;                            \
 382                __start_pci_fixups_resume = .;                          \
 383                KEEP(*(.pci_fixup_resume))                              \
 384                __end_pci_fixups_resume = .;                            \
 385                __start_pci_fixups_resume_early = .;                    \
 386                KEEP(*(.pci_fixup_resume_early))                        \
 387                __end_pci_fixups_resume_early = .;                      \
 388                __start_pci_fixups_suspend = .;                         \
 389                KEEP(*(.pci_fixup_suspend))                             \
 390                __end_pci_fixups_suspend = .;                           \
 391                __start_pci_fixups_suspend_late = .;                    \
 392                KEEP(*(.pci_fixup_suspend_late))                        \
 393                __end_pci_fixups_suspend_late = .;                      \
 394        }                                                               \
 395                                                                        \
 396        /* Built-in firmware blobs */                                   \
 397        .builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {      \
 398                __start_builtin_fw = .;                                 \
 399                KEEP(*(.builtin_fw))                                    \
 400                __end_builtin_fw = .;                                   \
 401        }                                                               \
 402                                                                        \
 403        TRACEDATA                                                       \
 404                                                                        \
 405        /* Kernel symbol table: Normal symbols */                       \
 406        __ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {         \
 407                __start___ksymtab = .;                                  \
 408                KEEP(*(SORT(___ksymtab+*)))                             \
 409                __stop___ksymtab = .;                                   \
 410        }                                                               \
 411                                                                        \
 412        /* Kernel symbol table: GPL-only symbols */                     \
 413        __ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {     \
 414                __start___ksymtab_gpl = .;                              \
 415                KEEP(*(SORT(___ksymtab_gpl+*)))                         \
 416                __stop___ksymtab_gpl = .;                               \
 417        }                                                               \
 418                                                                        \
 419        /* Kernel symbol table: Normal unused symbols */                \
 420        __ksymtab_unused  : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) {  \
 421                __start___ksymtab_unused = .;                           \
 422                KEEP(*(SORT(___ksymtab_unused+*)))                      \
 423                __stop___ksymtab_unused = .;                            \
 424        }                                                               \
 425                                                                        \
 426        /* Kernel symbol table: GPL-only unused symbols */              \
 427        __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
 428                __start___ksymtab_unused_gpl = .;                       \
 429                KEEP(*(SORT(___ksymtab_unused_gpl+*)))                  \
 430                __stop___ksymtab_unused_gpl = .;                        \
 431        }                                                               \
 432                                                                        \
 433        /* Kernel symbol table: GPL-future-only symbols */              \
 434        __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
 435                __start___ksymtab_gpl_future = .;                       \
 436                KEEP(*(SORT(___ksymtab_gpl_future+*)))                  \
 437                __stop___ksymtab_gpl_future = .;                        \
 438        }                                                               \
 439                                                                        \
 440        /* Kernel symbol table: Normal symbols */                       \
 441        __kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {         \
 442                __start___kcrctab = .;                                  \
 443                KEEP(*(SORT(___kcrctab+*)))                             \
 444                __stop___kcrctab = .;                                   \
 445        }                                                               \
 446                                                                        \
 447        /* Kernel symbol table: GPL-only symbols */                     \
 448        __kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {     \
 449                __start___kcrctab_gpl = .;                              \
 450                KEEP(*(SORT(___kcrctab_gpl+*)))                         \
 451                __stop___kcrctab_gpl = .;                               \
 452        }                                                               \
 453                                                                        \
 454        /* Kernel symbol table: Normal unused symbols */                \
 455        __kcrctab_unused  : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) {  \
 456                __start___kcrctab_unused = .;                           \
 457                KEEP(*(SORT(___kcrctab_unused+*)))                      \
 458                __stop___kcrctab_unused = .;                            \
 459        }                                                               \
 460                                                                        \
 461        /* Kernel symbol table: GPL-only unused symbols */              \
 462        __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
 463                __start___kcrctab_unused_gpl = .;                       \
 464                KEEP(*(SORT(___kcrctab_unused_gpl+*)))                  \
 465                __stop___kcrctab_unused_gpl = .;                        \
 466        }                                                               \
 467                                                                        \
 468        /* Kernel symbol table: GPL-future-only symbols */              \
 469        __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
 470                __start___kcrctab_gpl_future = .;                       \
 471                KEEP(*(SORT(___kcrctab_gpl_future+*)))                  \
 472                __stop___kcrctab_gpl_future = .;                        \
 473        }                                                               \
 474                                                                        \
 475        /* Kernel symbol table: strings */                              \
 476        __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
 477                *(__ksymtab_strings)                                    \
 478        }                                                               \
 479                                                                        \
 480        /* __*init sections */                                          \
 481        __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {         \
 482                *(.ref.rodata)                                          \
 483                MEM_KEEP(init.rodata)                                   \
 484                MEM_KEEP(exit.rodata)                                   \
 485        }                                                               \
 486                                                                        \
 487        /* Built-in module parameters. */                               \
 488        __param : AT(ADDR(__param) - LOAD_OFFSET) {                     \
 489                __start___param = .;                                    \
 490                KEEP(*(__param))                                        \
 491                __stop___param = .;                                     \
 492        }                                                               \
 493                                                                        \
 494        /* Built-in module versions. */                                 \
 495        __modver : AT(ADDR(__modver) - LOAD_OFFSET) {                   \
 496                __start___modver = .;                                   \
 497                KEEP(*(__modver))                                       \
 498                __stop___modver = .;                                    \
 499                . = ALIGN((align));                                     \
 500                __end_rodata = .;                                       \
 501        }                                                               \
 502        . = ALIGN((align));
 503
 504/* RODATA & RO_DATA provided for backward compatibility.
 505 * All archs are supposed to use RO_DATA() */
 506#define RODATA          RO_DATA_SECTION(4096)
 507#define RO_DATA(align)  RO_DATA_SECTION(align)
 508
 509/*
 510 * .text section. Map to function alignment to avoid address changes
 511 * during second ld run in second ld pass when generating System.map
 512 *
 513 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead
 514 * code elimination is enabled, so these sections should be converted
 515 * to use ".." first.
 516 */
 517#define TEXT_TEXT                                                       \
 518                ALIGN_FUNCTION();                                       \
 519                *(.text.hot TEXT_MAIN .text.fixup .text.unlikely)       \
 520                *(.text..refcount)                                      \
 521                *(.ref.text)                                            \
 522        MEM_KEEP(init.text*)                                            \
 523        MEM_KEEP(exit.text*)                                            \
 524
 525
 526/* sched.text is aling to function alignment to secure we have same
 527 * address even at second ld pass when generating System.map */
 528#define SCHED_TEXT                                                      \
 529                ALIGN_FUNCTION();                                       \
 530                __sched_text_start = .;                                 \
 531                *(.sched.text)                                          \
 532                __sched_text_end = .;
 533
 534/* spinlock.text is aling to function alignment to secure we have same
 535 * address even at second ld pass when generating System.map */
 536#define LOCK_TEXT                                                       \
 537                ALIGN_FUNCTION();                                       \
 538                __lock_text_start = .;                                  \
 539                *(.spinlock.text)                                       \
 540                __lock_text_end = .;
 541
 542#define CPUIDLE_TEXT                                                    \
 543                ALIGN_FUNCTION();                                       \
 544                __cpuidle_text_start = .;                               \
 545                *(.cpuidle.text)                                        \
 546                __cpuidle_text_end = .;
 547
 548#define KPROBES_TEXT                                                    \
 549                ALIGN_FUNCTION();                                       \
 550                __kprobes_text_start = .;                               \
 551                *(.kprobes.text)                                        \
 552                __kprobes_text_end = .;
 553
 554#define ENTRY_TEXT                                                      \
 555                ALIGN_FUNCTION();                                       \
 556                __entry_text_start = .;                                 \
 557                *(.entry.text)                                          \
 558                __entry_text_end = .;
 559
 560#define IRQENTRY_TEXT                                                   \
 561                ALIGN_FUNCTION();                                       \
 562                __irqentry_text_start = .;                              \
 563                *(.irqentry.text)                                       \
 564                __irqentry_text_end = .;
 565
 566#define SOFTIRQENTRY_TEXT                                               \
 567                ALIGN_FUNCTION();                                       \
 568                __softirqentry_text_start = .;                          \
 569                *(.softirqentry.text)                                   \
 570                __softirqentry_text_end = .;
 571
 572/* Section used for early init (in .S files) */
 573#define HEAD_TEXT  KEEP(*(.head.text))
 574
 575#define HEAD_TEXT_SECTION                                                       \
 576        .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {               \
 577                HEAD_TEXT                                               \
 578        }
 579
 580/*
 581 * Exception table
 582 */
 583#define EXCEPTION_TABLE(align)                                          \
 584        . = ALIGN(align);                                               \
 585        __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {               \
 586                __start___ex_table = .;                                 \
 587                KEEP(*(__ex_table))                                     \
 588                __stop___ex_table = .;                                  \
 589        }
 590
 591/*
 592 * Init task
 593 */
 594#define INIT_TASK_DATA_SECTION(align)                                   \
 595        . = ALIGN(align);                                               \
 596        .data..init_task :  AT(ADDR(.data..init_task) - LOAD_OFFSET) {  \
 597                INIT_TASK_DATA(align)                                   \
 598        }
 599
 600#ifdef CONFIG_CONSTRUCTORS
 601#define KERNEL_CTORS()  . = ALIGN(8);                      \
 602                        __ctors_start = .;                 \
 603                        KEEP(*(.ctors))                    \
 604                        KEEP(*(SORT(.init_array.*)))       \
 605                        KEEP(*(.init_array))               \
 606                        __ctors_end = .;
 607#else
 608#define KERNEL_CTORS()
 609#endif
 610
 611/* init and exit section handling */
 612#define INIT_DATA                                                       \
 613        KEEP(*(SORT(___kentry+*)))                                      \
 614        *(.init.data init.data.*)                                       \
 615        MEM_DISCARD(init.data*)                                         \
 616        KERNEL_CTORS()                                                  \
 617        MCOUNT_REC()                                                    \
 618        *(.init.rodata .init.rodata.*)                                  \
 619        FTRACE_EVENTS()                                                 \
 620        TRACE_SYSCALLS()                                                \
 621        KPROBE_BLACKLIST()                                              \
 622        ERROR_INJECT_WHITELIST()                                        \
 623        MEM_DISCARD(init.rodata)                                        \
 624        CLK_OF_TABLES()                                                 \
 625        RESERVEDMEM_OF_TABLES()                                         \
 626        TIMER_OF_TABLES()                                               \
 627        CPU_METHOD_OF_TABLES()                                          \
 628        CPUIDLE_METHOD_OF_TABLES()                                      \
 629        KERNEL_DTB()                                                    \
 630        IRQCHIP_OF_MATCH_TABLE()                                        \
 631        ACPI_PROBE_TABLE(irqchip)                                       \
 632        ACPI_PROBE_TABLE(timer)                                         \
 633        THERMAL_TABLE(governor)                                         \
 634        EARLYCON_TABLE()                                                \
 635        LSM_TABLE()                                                     \
 636        EARLY_LSM_TABLE()
 637
 638#define INIT_TEXT                                                       \
 639        *(.init.text .init.text.*)                                      \
 640        *(.text.startup)                                                \
 641        MEM_DISCARD(init.text*)
 642
 643#define EXIT_DATA                                                       \
 644        *(.exit.data .exit.data.*)                                      \
 645        *(.fini_array .fini_array.*)                                    \
 646        *(.dtors .dtors.*)                                              \
 647        MEM_DISCARD(exit.data*)                                         \
 648        MEM_DISCARD(exit.rodata*)
 649
 650#define EXIT_TEXT                                                       \
 651        *(.exit.text)                                                   \
 652        *(.text.exit)                                                   \
 653        MEM_DISCARD(exit.text)
 654
 655#define EXIT_CALL                                                       \
 656        *(.exitcall.exit)
 657
 658/*
 659 * bss (Block Started by Symbol) - uninitialized data
 660 * zeroed during startup
 661 */
 662#define SBSS(sbss_align)                                                \
 663        . = ALIGN(sbss_align);                                          \
 664        .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {                         \
 665                *(.dynsbss)                                             \
 666                *(SBSS_MAIN)                                            \
 667                *(.scommon)                                             \
 668        }
 669
 670/*
 671 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
 672 * sections to the front of bss.
 673 */
 674#ifndef BSS_FIRST_SECTIONS
 675#define BSS_FIRST_SECTIONS
 676#endif
 677
 678#define BSS(bss_align)                                                  \
 679        . = ALIGN(bss_align);                                           \
 680        .bss : AT(ADDR(.bss) - LOAD_OFFSET) {                           \
 681                BSS_FIRST_SECTIONS                                      \
 682                *(.bss..page_aligned)                                   \
 683                *(.dynbss)                                              \
 684                *(BSS_MAIN)                                             \
 685                *(COMMON)                                               \
 686        }
 687
 688/*
 689 * DWARF debug sections.
 690 * Symbols in the DWARF debugging sections are relative to
 691 * the beginning of the section so we begin them at 0.
 692 */
 693#define DWARF_DEBUG                                                     \
 694                /* DWARF 1 */                                           \
 695                .debug          0 : { *(.debug) }                       \
 696                .line           0 : { *(.line) }                        \
 697                /* GNU DWARF 1 extensions */                            \
 698                .debug_srcinfo  0 : { *(.debug_srcinfo) }               \
 699                .debug_sfnames  0 : { *(.debug_sfnames) }               \
 700                /* DWARF 1.1 and DWARF 2 */                             \
 701                .debug_aranges  0 : { *(.debug_aranges) }               \
 702                .debug_pubnames 0 : { *(.debug_pubnames) }              \
 703                /* DWARF 2 */                                           \
 704                .debug_info     0 : { *(.debug_info                     \
 705                                .gnu.linkonce.wi.*) }                   \
 706                .debug_abbrev   0 : { *(.debug_abbrev) }                \
 707                .debug_line     0 : { *(.debug_line) }                  \
 708                .debug_frame    0 : { *(.debug_frame) }                 \
 709                .debug_str      0 : { *(.debug_str) }                   \
 710                .debug_loc      0 : { *(.debug_loc) }                   \
 711                .debug_macinfo  0 : { *(.debug_macinfo) }               \
 712                .debug_pubtypes 0 : { *(.debug_pubtypes) }              \
 713                /* DWARF 3 */                                           \
 714                .debug_ranges   0 : { *(.debug_ranges) }                \
 715                /* SGI/MIPS DWARF 2 extensions */                       \
 716                .debug_weaknames 0 : { *(.debug_weaknames) }            \
 717                .debug_funcnames 0 : { *(.debug_funcnames) }            \
 718                .debug_typenames 0 : { *(.debug_typenames) }            \
 719                .debug_varnames  0 : { *(.debug_varnames) }             \
 720                /* GNU DWARF 2 extensions */                            \
 721                .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) }      \
 722                .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) }      \
 723                /* DWARF 4 */                                           \
 724                .debug_types    0 : { *(.debug_types) }                 \
 725                /* DWARF 5 */                                           \
 726                .debug_macro    0 : { *(.debug_macro) }                 \
 727                .debug_addr     0 : { *(.debug_addr) }
 728
 729                /* Stabs debugging sections.  */
 730#define STABS_DEBUG                                                     \
 731                .stab 0 : { *(.stab) }                                  \
 732                .stabstr 0 : { *(.stabstr) }                            \
 733                .stab.excl 0 : { *(.stab.excl) }                        \
 734                .stab.exclstr 0 : { *(.stab.exclstr) }                  \
 735                .stab.index 0 : { *(.stab.index) }                      \
 736                .stab.indexstr 0 : { *(.stab.indexstr) }                \
 737                .comment 0 : { *(.comment) }
 738
 739#ifdef CONFIG_GENERIC_BUG
 740#define BUG_TABLE                                                       \
 741        . = ALIGN(8);                                                   \
 742        __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {             \
 743                __start___bug_table = .;                                \
 744                KEEP(*(__bug_table))                                    \
 745                __stop___bug_table = .;                                 \
 746        }
 747#else
 748#define BUG_TABLE
 749#endif
 750
 751#ifdef CONFIG_UNWINDER_ORC
 752#define ORC_UNWIND_TABLE                                                \
 753        . = ALIGN(4);                                                   \
 754        .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) {       \
 755                __start_orc_unwind_ip = .;                              \
 756                KEEP(*(.orc_unwind_ip))                                 \
 757                __stop_orc_unwind_ip = .;                               \
 758        }                                                               \
 759        . = ALIGN(2);                                                   \
 760        .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) {             \
 761                __start_orc_unwind = .;                                 \
 762                KEEP(*(.orc_unwind))                                    \
 763                __stop_orc_unwind = .;                                  \
 764        }                                                               \
 765        . = ALIGN(4);                                                   \
 766        .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) {             \
 767                orc_lookup = .;                                         \
 768                . += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) /        \
 769                        LOOKUP_BLOCK_SIZE) + 1) * 4;                    \
 770                orc_lookup_end = .;                                     \
 771        }
 772#else
 773#define ORC_UNWIND_TABLE
 774#endif
 775
 776#ifdef CONFIG_PM_TRACE
 777#define TRACEDATA                                                       \
 778        . = ALIGN(4);                                                   \
 779        .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {               \
 780                __tracedata_start = .;                                  \
 781                KEEP(*(.tracedata))                                     \
 782                __tracedata_end = .;                                    \
 783        }
 784#else
 785#define TRACEDATA
 786#endif
 787
 788#define NOTES                                                           \
 789        .notes : AT(ADDR(.notes) - LOAD_OFFSET) {                       \
 790                __start_notes = .;                                      \
 791                KEEP(*(.note.*))                                        \
 792                __stop_notes = .;                                       \
 793        }
 794
 795#define INIT_SETUP(initsetup_align)                                     \
 796                . = ALIGN(initsetup_align);                             \
 797                __setup_start = .;                                      \
 798                KEEP(*(.init.setup))                                    \
 799                __setup_end = .;
 800
 801#define INIT_CALLS_LEVEL(level)                                         \
 802                __initcall##level##_start = .;                          \
 803                KEEP(*(.initcall##level##.init))                        \
 804                KEEP(*(.initcall##level##s.init))                       \
 805
 806#define INIT_CALLS                                                      \
 807                __initcall_start = .;                                   \
 808                KEEP(*(.initcallearly.init))                            \
 809                INIT_CALLS_LEVEL(0)                                     \
 810                INIT_CALLS_LEVEL(1)                                     \
 811                INIT_CALLS_LEVEL(2)                                     \
 812                INIT_CALLS_LEVEL(3)                                     \
 813                INIT_CALLS_LEVEL(4)                                     \
 814                INIT_CALLS_LEVEL(5)                                     \
 815                INIT_CALLS_LEVEL(rootfs)                                \
 816                INIT_CALLS_LEVEL(6)                                     \
 817                INIT_CALLS_LEVEL(7)                                     \
 818                __initcall_end = .;
 819
 820#define CON_INITCALL                                                    \
 821                __con_initcall_start = .;                               \
 822                KEEP(*(.con_initcall.init))                             \
 823                __con_initcall_end = .;
 824
 825#ifdef CONFIG_BLK_DEV_INITRD
 826#define INIT_RAM_FS                                                     \
 827        . = ALIGN(4);                                                   \
 828        __initramfs_start = .;                                          \
 829        KEEP(*(.init.ramfs))                                            \
 830        . = ALIGN(8);                                                   \
 831        KEEP(*(.init.ramfs.info))
 832#else
 833#define INIT_RAM_FS
 834#endif
 835
 836/*
 837 * Memory encryption operates on a page basis. Since we need to clear
 838 * the memory encryption mask for this section, it needs to be aligned
 839 * on a page boundary and be a page-size multiple in length.
 840 *
 841 * Note: We use a separate section so that only this section gets
 842 * decrypted to avoid exposing more than we wish.
 843 */
 844#ifdef CONFIG_AMD_MEM_ENCRYPT
 845#define PERCPU_DECRYPTED_SECTION                                        \
 846        . = ALIGN(PAGE_SIZE);                                           \
 847        *(.data..percpu..decrypted)                                     \
 848        . = ALIGN(PAGE_SIZE);
 849#else
 850#define PERCPU_DECRYPTED_SECTION
 851#endif
 852
 853
 854/*
 855 * Default discarded sections.
 856 *
 857 * Some archs want to discard exit text/data at runtime rather than
 858 * link time due to cross-section references such as alt instructions,
 859 * bug table, eh_frame, etc.  DISCARDS must be the last of output
 860 * section definitions so that such archs put those in earlier section
 861 * definitions.
 862 */
 863#define DISCARDS                                                        \
 864        /DISCARD/ : {                                                   \
 865        EXIT_TEXT                                                       \
 866        EXIT_DATA                                                       \
 867        EXIT_CALL                                                       \
 868        *(.discard)                                                     \
 869        *(.discard.*)                                                   \
 870        *(.modinfo)                                                     \
 871        }
 872
 873/**
 874 * PERCPU_INPUT - the percpu input sections
 875 * @cacheline: cacheline size
 876 *
 877 * The core percpu section names and core symbols which do not rely
 878 * directly upon load addresses.
 879 *
 880 * @cacheline is used to align subsections to avoid false cacheline
 881 * sharing between subsections for different purposes.
 882 */
 883#define PERCPU_INPUT(cacheline)                                         \
 884        __per_cpu_start = .;                                            \
 885        *(.data..percpu..first)                                         \
 886        . = ALIGN(PAGE_SIZE);                                           \
 887        *(.data..percpu..page_aligned)                                  \
 888        . = ALIGN(cacheline);                                           \
 889        *(.data..percpu..read_mostly)                                   \
 890        . = ALIGN(cacheline);                                           \
 891        *(.data..percpu)                                                \
 892        *(.data..percpu..shared_aligned)                                \
 893        PERCPU_DECRYPTED_SECTION                                        \
 894        __per_cpu_end = .;
 895
 896/**
 897 * PERCPU_VADDR - define output section for percpu area
 898 * @cacheline: cacheline size
 899 * @vaddr: explicit base address (optional)
 900 * @phdr: destination PHDR (optional)
 901 *
 902 * Macro which expands to output section for percpu area.
 903 *
 904 * @cacheline is used to align subsections to avoid false cacheline
 905 * sharing between subsections for different purposes.
 906 *
 907 * If @vaddr is not blank, it specifies explicit base address and all
 908 * percpu symbols will be offset from the given address.  If blank,
 909 * @vaddr always equals @laddr + LOAD_OFFSET.
 910 *
 911 * @phdr defines the output PHDR to use if not blank.  Be warned that
 912 * output PHDR is sticky.  If @phdr is specified, the next output
 913 * section in the linker script will go there too.  @phdr should have
 914 * a leading colon.
 915 *
 916 * Note that this macros defines __per_cpu_load as an absolute symbol.
 917 * If there is no need to put the percpu section at a predetermined
 918 * address, use PERCPU_SECTION.
 919 */
 920#define PERCPU_VADDR(cacheline, vaddr, phdr)                            \
 921        __per_cpu_load = .;                                             \
 922        .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) {        \
 923                PERCPU_INPUT(cacheline)                                 \
 924        } phdr                                                          \
 925        . = __per_cpu_load + SIZEOF(.data..percpu);
 926
 927/**
 928 * PERCPU_SECTION - define output section for percpu area, simple version
 929 * @cacheline: cacheline size
 930 *
 931 * Align to PAGE_SIZE and outputs output section for percpu area.  This
 932 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
 933 * __per_cpu_start will be identical.
 934 *
 935 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
 936 * except that __per_cpu_load is defined as a relative symbol against
 937 * .data..percpu which is required for relocatable x86_32 configuration.
 938 */
 939#define PERCPU_SECTION(cacheline)                                       \
 940        . = ALIGN(PAGE_SIZE);                                           \
 941        .data..percpu   : AT(ADDR(.data..percpu) - LOAD_OFFSET) {       \
 942                __per_cpu_load = .;                                     \
 943                PERCPU_INPUT(cacheline)                                 \
 944        }
 945
 946
 947/*
 948 * Definition of the high level *_SECTION macros
 949 * They will fit only a subset of the architectures
 950 */
 951
 952
 953/*
 954 * Writeable data.
 955 * All sections are combined in a single .data section.
 956 * The sections following CONSTRUCTORS are arranged so their
 957 * typical alignment matches.
 958 * A cacheline is typical/always less than a PAGE_SIZE so
 959 * the sections that has this restriction (or similar)
 960 * is located before the ones requiring PAGE_SIZE alignment.
 961 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
 962 * matches the requirement of PAGE_ALIGNED_DATA.
 963 *
 964 * use 0 as page_align if page_aligned data is not used */
 965#define RW_DATA_SECTION(cacheline, pagealigned, inittask)               \
 966        . = ALIGN(PAGE_SIZE);                                           \
 967        .data : AT(ADDR(.data) - LOAD_OFFSET) {                         \
 968                INIT_TASK_DATA(inittask)                                \
 969                NOSAVE_DATA                                             \
 970                PAGE_ALIGNED_DATA(pagealigned)                          \
 971                CACHELINE_ALIGNED_DATA(cacheline)                       \
 972                READ_MOSTLY_DATA(cacheline)                             \
 973                DATA_DATA                                               \
 974                CONSTRUCTORS                                            \
 975        }                                                               \
 976        BUG_TABLE                                                       \
 977
 978#define INIT_TEXT_SECTION(inittext_align)                               \
 979        . = ALIGN(inittext_align);                                      \
 980        .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {               \
 981                _sinittext = .;                                         \
 982                INIT_TEXT                                               \
 983                _einittext = .;                                         \
 984        }
 985
 986#define INIT_DATA_SECTION(initsetup_align)                              \
 987        .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {               \
 988                INIT_DATA                                               \
 989                INIT_SETUP(initsetup_align)                             \
 990                INIT_CALLS                                              \
 991                CON_INITCALL                                            \
 992                INIT_RAM_FS                                             \
 993        }
 994
 995#define BSS_SECTION(sbss_align, bss_align, stop_align)                  \
 996        . = ALIGN(sbss_align);                                          \
 997        __bss_start = .;                                                \
 998        SBSS(sbss_align)                                                \
 999        BSS(bss_align)                                                  \
1000        . = ALIGN(stop_align);                                          \
1001        __bss_stop = .;
1002