LXR linux/include/asm-generic/vmlinux.lds.h

   1/*
   2 * Helper macros to support writing architecture specific
   3 * linker scripts.
   4 *
   5 * A minimal linker scripts has following content:
   6 * [This is a sample, architectures may have special requiriements]
   7 *
   8 * OUTPUT_FORMAT(...)
   9 * OUTPUT_ARCH(...)
  10 * ENTRY(...)
  11 * SECTIONS
  12 * {
  13 *      . = START;
  14 *      __init_begin = .;
  15 *      HEAD_TEXT_SECTION
  16 *      INIT_TEXT_SECTION(PAGE_SIZE)
  17 *      INIT_DATA_SECTION(...)
  18 *      PERCPU_SECTION(CACHELINE_SIZE)
  19 *      __init_end = .;
  20 *
  21 *      _stext = .;
  22 *      TEXT_SECTION = 0
  23 *      _etext = .;
  24 *
  25 *      _sdata = .;
  26 *      RO_DATA_SECTION(PAGE_SIZE)
  27 *      RW_DATA_SECTION(...)
  28 *      _edata = .;
  29 *
  30 *      EXCEPTION_TABLE(...)
  31 *      NOTES
  32 *
  33 *      BSS_SECTION(0, 0, 0)
  34 *      _end = .;
  35 *
  36 *      STABS_DEBUG
  37 *      DWARF_DEBUG
  38 *
  39 *      DISCARDS                // must be the last
  40 * }
  41 *
  42 * [__init_begin, __init_end] is the init section that may be freed after init
  43 *      // __init_begin and __init_end should be page aligned, so that we can
  44 *      // free the whole .init memory
  45 * [_stext, _etext] is the text section
  46 * [_sdata, _edata] is the data section
  47 *
  48 * Some of the included output section have their own set of constants.
  49 * Examples are: [__initramfs_start, __initramfs_end] for initramfs and
  50 *               [__nosave_begin, __nosave_end] for the nosave data
  51 */
  52
  53#ifndef LOAD_OFFSET
  54#define LOAD_OFFSET 0
  55#endif
  56
  57#include <linux/export.h>
  58
  59/* Align . to a 8 byte boundary equals to maximum function alignment. */
  60#define ALIGN_FUNCTION()  . = ALIGN(8)
  61
  62/*
  63 * LD_DEAD_CODE_DATA_ELIMINATION option enables -fdata-sections, which
  64 * generates .data.identifier sections, which need to be pulled in with
  65 * .data. We don't want to pull in .data..other sections, which Linux
  66 * has defined. Same for text and bss.
  67 */
  68#ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
  69#define TEXT_MAIN .text .text.[0-9a-zA-Z_]*
  70#define DATA_MAIN .data .data.[0-9a-zA-Z_]*
  71#define BSS_MAIN .bss .bss.[0-9a-zA-Z_]*
  72#else
  73#define TEXT_MAIN .text
  74#define DATA_MAIN .data
  75#define BSS_MAIN .bss
  76#endif
  77
  78/*
  79 * Align to a 32 byte boundary equal to the
  80 * alignment gcc 4.5 uses for a struct
  81 */
  82#define STRUCT_ALIGNMENT 32
  83#define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
  84
  85/* The actual configuration determine if the init/exit sections
  86 * are handled as text/data or they can be discarded (which
  87 * often happens at runtime)
  88 */
  89#ifdef CONFIG_HOTPLUG_CPU
  90#define CPU_KEEP(sec)    *(.cpu##sec)
  91#define CPU_DISCARD(sec)
  92#else
  93#define CPU_KEEP(sec)
  94#define CPU_DISCARD(sec) *(.cpu##sec)
  95#endif
  96
  97#if defined(CONFIG_MEMORY_HOTPLUG)
  98#define MEM_KEEP(sec)    *(.mem##sec)
  99#define MEM_DISCARD(sec)
 100#else
 101#define MEM_KEEP(sec)
 102#define MEM_DISCARD(sec) *(.mem##sec)
 103#endif
 104
 105#ifdef CONFIG_FTRACE_MCOUNT_RECORD
 106#define MCOUNT_REC()    . = ALIGN(8);                           \
 107                        VMLINUX_SYMBOL(__start_mcount_loc) = .; \
 108                        *(__mcount_loc)                         \
 109                        VMLINUX_SYMBOL(__stop_mcount_loc) = .;
 110#else
 111#define MCOUNT_REC()
 112#endif
 113
 114#ifdef CONFIG_TRACE_BRANCH_PROFILING
 115#define LIKELY_PROFILE()        VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \
 116                                *(_ftrace_annotated_branch)                           \
 117                                VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .;
 118#else
 119#define LIKELY_PROFILE()
 120#endif
 121
 122#ifdef CONFIG_PROFILE_ALL_BRANCHES
 123#define BRANCH_PROFILE()        VMLINUX_SYMBOL(__start_branch_profile) = .;   \
 124                                *(_ftrace_branch)                             \
 125                                VMLINUX_SYMBOL(__stop_branch_profile) = .;
 126#else
 127#define BRANCH_PROFILE()
 128#endif
 129
 130#ifdef CONFIG_KPROBES
 131#define KPROBE_BLACKLIST()      . = ALIGN(8);                                 \
 132                                VMLINUX_SYMBOL(__start_kprobe_blacklist) = .; \
 133                                KEEP(*(_kprobe_blacklist))                    \
 134                                VMLINUX_SYMBOL(__stop_kprobe_blacklist) = .;
 135#else
 136#define KPROBE_BLACKLIST()
 137#endif
 138
 139#ifdef CONFIG_FUNCTION_ERROR_INJECTION
 140#define ERROR_INJECT_WHITELIST()        STRUCT_ALIGN();                       \
 141                        VMLINUX_SYMBOL(__start_error_injection_whitelist) = .;\
 142                        KEEP(*(_error_injection_whitelist))                   \
 143                        VMLINUX_SYMBOL(__stop_error_injection_whitelist) = .;
 144#else
 145#define ERROR_INJECT_WHITELIST()
 146#endif
 147
 148#ifdef CONFIG_EVENT_TRACING
 149#define FTRACE_EVENTS() . = ALIGN(8);                                   \
 150                        VMLINUX_SYMBOL(__start_ftrace_events) = .;      \
 151                        KEEP(*(_ftrace_events))                         \
 152                        VMLINUX_SYMBOL(__stop_ftrace_events) = .;       \
 153                        VMLINUX_SYMBOL(__start_ftrace_eval_maps) = .;   \
 154                        KEEP(*(_ftrace_eval_map))                       \
 155                        VMLINUX_SYMBOL(__stop_ftrace_eval_maps) = .;
 156#else
 157#define FTRACE_EVENTS()
 158#endif
 159
 160#ifdef CONFIG_TRACING
 161#define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .;      \
 162                         KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \
 163                         VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;
 164#define TRACEPOINT_STR() VMLINUX_SYMBOL(__start___tracepoint_str) = .;  \
 165                         KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \
 166                         VMLINUX_SYMBOL(__stop___tracepoint_str) = .;
 167#else
 168#define TRACE_PRINTKS()
 169#define TRACEPOINT_STR()
 170#endif
 171
 172#ifdef CONFIG_FTRACE_SYSCALLS
 173#define TRACE_SYSCALLS() . = ALIGN(8);                                  \
 174                         VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \
 175                         KEEP(*(__syscalls_metadata))                   \
 176                         VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
 177#else
 178#define TRACE_SYSCALLS()
 179#endif
 180
 181#ifdef CONFIG_BPF_EVENTS
 182#define BPF_RAW_TP() STRUCT_ALIGN();                                    \
 183                         VMLINUX_SYMBOL(__start__bpf_raw_tp) = .;       \
 184                         KEEP(*(__bpf_raw_tp_map))                      \
 185                         VMLINUX_SYMBOL(__stop__bpf_raw_tp) = .;
 186#else
 187#define BPF_RAW_TP()
 188#endif
 189
 190#ifdef CONFIG_SERIAL_EARLYCON
 191#define EARLYCON_TABLE() . = ALIGN(8);                          \
 192                         VMLINUX_SYMBOL(__earlycon_table) = .;  \
 193                         KEEP(*(__earlycon_table))              \
 194                         VMLINUX_SYMBOL(__earlycon_table_end) = .;
 195#else
 196#define EARLYCON_TABLE()
 197#endif
 198
 199#define ___OF_TABLE(cfg, name)  _OF_TABLE_##cfg(name)
 200#define __OF_TABLE(cfg, name)   ___OF_TABLE(cfg, name)
 201#define OF_TABLE(cfg, name)     __OF_TABLE(IS_ENABLED(cfg), name)
 202#define _OF_TABLE_0(name)
 203#define _OF_TABLE_1(name)                                               \
 204        . = ALIGN(8);                                                   \
 205        VMLINUX_SYMBOL(__##name##_of_table) = .;                        \
 206        KEEP(*(__##name##_of_table))                                    \
 207        KEEP(*(__##name##_of_table_end))
 208
 209#define TIMER_OF_TABLES()       OF_TABLE(CONFIG_TIMER_OF, timer)
 210#define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
 211#define CLK_OF_TABLES()         OF_TABLE(CONFIG_COMMON_CLK, clk)
 212#define IOMMU_OF_TABLES()       OF_TABLE(CONFIG_OF_IOMMU, iommu)
 213#define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
 214#define CPU_METHOD_OF_TABLES()  OF_TABLE(CONFIG_SMP, cpu_method)
 215#define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method)
 216
 217#ifdef CONFIG_ACPI
 218#define ACPI_PROBE_TABLE(name)                                          \
 219        . = ALIGN(8);                                                   \
 220        VMLINUX_SYMBOL(__##name##_acpi_probe_table) = .;                \
 221        KEEP(*(__##name##_acpi_probe_table))                            \
 222        VMLINUX_SYMBOL(__##name##_acpi_probe_table_end) = .;
 223#else
 224#define ACPI_PROBE_TABLE(name)
 225#endif
 226
 227#define KERNEL_DTB()                                                    \
 228        STRUCT_ALIGN();                                                 \
 229        VMLINUX_SYMBOL(__dtb_start) = .;                                \
 230        KEEP(*(.dtb.init.rodata))                                       \
 231        VMLINUX_SYMBOL(__dtb_end) = .;
 232
 233/*
 234 * .data section
 235 */
 236#define DATA_DATA                                                       \
 237        *(.xiptext)                                                     \
 238        *(DATA_MAIN)                                                    \
 239        *(.ref.data)                                                    \
 240        *(.data..shared_aligned) /* percpu related */                   \
 241        MEM_KEEP(init.data)                                             \
 242        MEM_KEEP(exit.data)                                             \
 243        *(.data.unlikely)                                               \
 244        VMLINUX_SYMBOL(__start_once) = .;                               \
 245        *(.data.once)                                                   \
 246        VMLINUX_SYMBOL(__end_once) = .;                                 \
 247        STRUCT_ALIGN();                                                 \
 248        *(__tracepoints)                                                \
 249        /* implement dynamic printk debug */                            \
 250        . = ALIGN(8);                                                   \
 251        VMLINUX_SYMBOL(__start___jump_table) = .;                       \
 252        KEEP(*(__jump_table))                                           \
 253        VMLINUX_SYMBOL(__stop___jump_table) = .;                        \
 254        . = ALIGN(8);                                                   \
 255        VMLINUX_SYMBOL(__start___verbose) = .;                          \
 256        KEEP(*(__verbose))                                              \
 257        VMLINUX_SYMBOL(__stop___verbose) = .;                           \
 258        LIKELY_PROFILE()                                                \
 259        BRANCH_PROFILE()                                                \
 260        TRACE_PRINTKS()                                                 \
 261        BPF_RAW_TP()                                                    \
 262        TRACEPOINT_STR()
 263
 264/*
 265 * Data section helpers
 266 */
 267#define NOSAVE_DATA                                                     \
 268        . = ALIGN(PAGE_SIZE);                                           \
 269        VMLINUX_SYMBOL(__nosave_begin) = .;                             \
 270        *(.data..nosave)                                                \
 271        . = ALIGN(PAGE_SIZE);                                           \
 272        VMLINUX_SYMBOL(__nosave_end) = .;
 273
 274#define PAGE_ALIGNED_DATA(page_align)                                   \
 275        . = ALIGN(page_align);                                          \
 276        *(.data..page_aligned)
 277
 278#define READ_MOSTLY_DATA(align)                                         \
 279        . = ALIGN(align);                                               \
 280        *(.data..read_mostly)                                           \
 281        . = ALIGN(align);
 282
 283#define CACHELINE_ALIGNED_DATA(align)                                   \
 284        . = ALIGN(align);                                               \
 285        *(.data..cacheline_aligned)
 286
 287#define INIT_TASK_DATA(align)                                           \
 288        . = ALIGN(align);                                               \
 289        VMLINUX_SYMBOL(__start_init_task) = .;                          \
 290        VMLINUX_SYMBOL(init_thread_union) = .;                          \
 291        VMLINUX_SYMBOL(init_stack) = .;                                 \
 292        *(.data..init_task)                                             \
 293        *(.data..init_thread_info)                                      \
 294        . = VMLINUX_SYMBOL(__start_init_task) + THREAD_SIZE;            \
 295        VMLINUX_SYMBOL(__end_init_task) = .;
 296
 297/*
 298 * Allow architectures to handle ro_after_init data on their
 299 * own by defining an empty RO_AFTER_INIT_DATA.
 300 */
 301#ifndef RO_AFTER_INIT_DATA
 302#define RO_AFTER_INIT_DATA                                              \
 303        VMLINUX_SYMBOL(__start_ro_after_init) = .;                      \
 304        *(.data..ro_after_init)                                         \
 305        VMLINUX_SYMBOL(__end_ro_after_init) = .;
 306#endif
 307
 308/*
 309 * Read only Data
 310 */
 311#define RO_DATA_SECTION(align)                                          \
 312        . = ALIGN((align));                                             \
 313        .rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {           \
 314                VMLINUX_SYMBOL(__start_rodata) = .;                     \
 315                *(.rodata) *(.rodata.*)                                 \
 316                RO_AFTER_INIT_DATA      /* Read only after init */      \
 317                KEEP(*(__vermagic))     /* Kernel version magic */      \
 318                . = ALIGN(8);                                           \
 319                VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .;         \
 320                KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \
 321                VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .;          \
 322                *(__tracepoints_strings)/* Tracepoints: strings */      \
 323        }                                                               \
 324                                                                        \
 325        .rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {          \
 326                *(.rodata1)                                             \
 327        }                                                               \
 328                                                                        \
 329        /* PCI quirks */                                                \
 330        .pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {        \
 331                VMLINUX_SYMBOL(__start_pci_fixups_early) = .;           \
 332                KEEP(*(.pci_fixup_early))                               \
 333                VMLINUX_SYMBOL(__end_pci_fixups_early) = .;             \
 334                VMLINUX_SYMBOL(__start_pci_fixups_header) = .;          \
 335                KEEP(*(.pci_fixup_header))                              \
 336                VMLINUX_SYMBOL(__end_pci_fixups_header) = .;            \
 337                VMLINUX_SYMBOL(__start_pci_fixups_final) = .;           \
 338                KEEP(*(.pci_fixup_final))                               \
 339                VMLINUX_SYMBOL(__end_pci_fixups_final) = .;             \
 340                VMLINUX_SYMBOL(__start_pci_fixups_enable) = .;          \
 341                KEEP(*(.pci_fixup_enable))                              \
 342                VMLINUX_SYMBOL(__end_pci_fixups_enable) = .;            \
 343                VMLINUX_SYMBOL(__start_pci_fixups_resume) = .;          \
 344                KEEP(*(.pci_fixup_resume))                              \
 345                VMLINUX_SYMBOL(__end_pci_fixups_resume) = .;            \
 346                VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .;    \
 347                KEEP(*(.pci_fixup_resume_early))                        \
 348                VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .;      \
 349                VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .;         \
 350                KEEP(*(.pci_fixup_suspend))                             \
 351                VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .;           \
 352                VMLINUX_SYMBOL(__start_pci_fixups_suspend_late) = .;    \
 353                KEEP(*(.pci_fixup_suspend_late))                        \
 354                VMLINUX_SYMBOL(__end_pci_fixups_suspend_late) = .;      \
 355        }                                                               \
 356                                                                        \
 357        /* Built-in firmware blobs */                                   \
 358        .builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {      \
 359                VMLINUX_SYMBOL(__start_builtin_fw) = .;                 \
 360                KEEP(*(.builtin_fw))                                    \
 361                VMLINUX_SYMBOL(__end_builtin_fw) = .;                   \
 362        }                                                               \
 363                                                                        \
 364        TRACEDATA                                                       \
 365                                                                        \
 366        /* Kernel symbol table: Normal symbols */                       \
 367        __ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {         \
 368                VMLINUX_SYMBOL(__start___ksymtab) = .;                  \
 369                KEEP(*(SORT(___ksymtab+*)))                             \
 370                VMLINUX_SYMBOL(__stop___ksymtab) = .;                   \
 371        }                                                               \
 372                                                                        \
 373        /* Kernel symbol table: GPL-only symbols */                     \
 374        __ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {     \
 375                VMLINUX_SYMBOL(__start___ksymtab_gpl) = .;              \
 376                KEEP(*(SORT(___ksymtab_gpl+*)))                         \
 377                VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .;               \
 378        }                                                               \
 379                                                                        \
 380        /* Kernel symbol table: Normal unused symbols */                \
 381        __ksymtab_unused  : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) {  \
 382                VMLINUX_SYMBOL(__start___ksymtab_unused) = .;           \
 383                KEEP(*(SORT(___ksymtab_unused+*)))                      \
 384                VMLINUX_SYMBOL(__stop___ksymtab_unused) = .;            \
 385        }                                                               \
 386                                                                        \
 387        /* Kernel symbol table: GPL-only unused symbols */              \
 388        __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
 389                VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .;       \
 390                KEEP(*(SORT(___ksymtab_unused_gpl+*)))                  \
 391                VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .;        \
 392        }                                                               \
 393                                                                        \
 394        /* Kernel symbol table: GPL-future-only symbols */              \
 395        __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
 396                VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .;       \
 397                KEEP(*(SORT(___ksymtab_gpl_future+*)))                  \
 398                VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .;        \
 399        }                                                               \
 400                                                                        \
 401        /* Kernel symbol table: Normal symbols */                       \
 402        __kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {         \
 403                VMLINUX_SYMBOL(__start___kcrctab) = .;                  \
 404                KEEP(*(SORT(___kcrctab+*)))                             \
 405                VMLINUX_SYMBOL(__stop___kcrctab) = .;                   \
 406        }                                                               \
 407                                                                        \
 408        /* Kernel symbol table: GPL-only symbols */                     \
 409        __kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {     \
 410                VMLINUX_SYMBOL(__start___kcrctab_gpl) = .;              \
 411                KEEP(*(SORT(___kcrctab_gpl+*)))                         \
 412                VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .;               \
 413        }                                                               \
 414                                                                        \
 415        /* Kernel symbol table: Normal unused symbols */                \
 416        __kcrctab_unused  : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) {  \
 417                VMLINUX_SYMBOL(__start___kcrctab_unused) = .;           \
 418                KEEP(*(SORT(___kcrctab_unused+*)))                      \
 419                VMLINUX_SYMBOL(__stop___kcrctab_unused) = .;            \
 420        }                                                               \
 421                                                                        \
 422        /* Kernel symbol table: GPL-only unused symbols */              \
 423        __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
 424                VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .;       \
 425                KEEP(*(SORT(___kcrctab_unused_gpl+*)))                  \
 426                VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .;        \
 427        }                                                               \
 428                                                                        \
 429        /* Kernel symbol table: GPL-future-only symbols */              \
 430        __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
 431                VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .;       \
 432                KEEP(*(SORT(___kcrctab_gpl_future+*)))                  \
 433                VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .;        \
 434        }                                                               \
 435                                                                        \
 436        /* Kernel symbol table: strings */                              \
 437        __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
 438                *(__ksymtab_strings)                                    \
 439        }                                                               \
 440                                                                        \
 441        /* __*init sections */                                          \
 442        __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {         \
 443                *(.ref.rodata)                                          \
 444                MEM_KEEP(init.rodata)                                   \
 445                MEM_KEEP(exit.rodata)                                   \
 446        }                                                               \
 447                                                                        \
 448        /* Built-in module parameters. */                               \
 449        __param : AT(ADDR(__param) - LOAD_OFFSET) {                     \
 450                VMLINUX_SYMBOL(__start___param) = .;                    \
 451                KEEP(*(__param))                                        \
 452                VMLINUX_SYMBOL(__stop___param) = .;                     \
 453        }                                                               \
 454                                                                        \
 455        /* Built-in module versions. */                                 \
 456        __modver : AT(ADDR(__modver) - LOAD_OFFSET) {                   \
 457                VMLINUX_SYMBOL(__start___modver) = .;                   \
 458                KEEP(*(__modver))                                       \
 459                VMLINUX_SYMBOL(__stop___modver) = .;                    \
 460                . = ALIGN((align));                                     \
 461                VMLINUX_SYMBOL(__end_rodata) = .;                       \
 462        }                                                               \
 463        . = ALIGN((align));
 464
 465/* RODATA & RO_DATA provided for backward compatibility.
 466 * All archs are supposed to use RO_DATA() */
 467#define RODATA          RO_DATA_SECTION(4096)
 468#define RO_DATA(align)  RO_DATA_SECTION(align)
 469
 470#define SECURITY_INIT                                                   \
 471        .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
 472                VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 473                KEEP(*(.security_initcall.init))                        \
 474                VMLINUX_SYMBOL(__security_initcall_end) = .;            \
 475        }
 476
 477/*
 478 * .text section. Map to function alignment to avoid address changes
 479 * during second ld run in second ld pass when generating System.map
 480 *
 481 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead
 482 * code elimination is enabled, so these sections should be converted
 483 * to use ".." first.
 484 */
 485#define TEXT_TEXT                                                       \
 486                ALIGN_FUNCTION();                                       \
 487                *(.text.hot TEXT_MAIN .text.fixup .text.unlikely)       \
 488                *(.text..refcount)                                      \
 489                *(.ref.text)                                            \
 490        MEM_KEEP(init.text)                                             \
 491        MEM_KEEP(exit.text)                                             \
 492
 493
 494/* sched.text is aling to function alignment to secure we have same
 495 * address even at second ld pass when generating System.map */
 496#define SCHED_TEXT                                                      \
 497                ALIGN_FUNCTION();                                       \
 498                VMLINUX_SYMBOL(__sched_text_start) = .;                 \
 499                *(.sched.text)                                          \
 500                VMLINUX_SYMBOL(__sched_text_end) = .;
 501
 502/* spinlock.text is aling to function alignment to secure we have same
 503 * address even at second ld pass when generating System.map */
 504#define LOCK_TEXT                                                       \
 505                ALIGN_FUNCTION();                                       \
 506                VMLINUX_SYMBOL(__lock_text_start) = .;                  \
 507                *(.spinlock.text)                                       \
 508                VMLINUX_SYMBOL(__lock_text_end) = .;
 509
 510#define CPUIDLE_TEXT                                                    \
 511                ALIGN_FUNCTION();                                       \
 512                VMLINUX_SYMBOL(__cpuidle_text_start) = .;               \
 513                *(.cpuidle.text)                                        \
 514                VMLINUX_SYMBOL(__cpuidle_text_end) = .;
 515
 516#define KPROBES_TEXT                                                    \
 517                ALIGN_FUNCTION();                                       \
 518                VMLINUX_SYMBOL(__kprobes_text_start) = .;               \
 519                *(.kprobes.text)                                        \
 520                VMLINUX_SYMBOL(__kprobes_text_end) = .;
 521
 522#define ENTRY_TEXT                                                      \
 523                ALIGN_FUNCTION();                                       \
 524                VMLINUX_SYMBOL(__entry_text_start) = .;                 \
 525                *(.entry.text)                                          \
 526                VMLINUX_SYMBOL(__entry_text_end) = .;
 527
 528#define IRQENTRY_TEXT                                                   \
 529                ALIGN_FUNCTION();                                       \
 530                VMLINUX_SYMBOL(__irqentry_text_start) = .;              \
 531                *(.irqentry.text)                                       \
 532                VMLINUX_SYMBOL(__irqentry_text_end) = .;
 533
 534#define SOFTIRQENTRY_TEXT                                               \
 535                ALIGN_FUNCTION();                                       \
 536                VMLINUX_SYMBOL(__softirqentry_text_start) = .;          \
 537                *(.softirqentry.text)                                   \
 538                VMLINUX_SYMBOL(__softirqentry_text_end) = .;
 539
 540/* Section used for early init (in .S files) */
 541#define HEAD_TEXT  *(.head.text)
 542
 543#define HEAD_TEXT_SECTION                                                       \
 544        .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {               \
 545                HEAD_TEXT                                               \
 546        }
 547
 548/*
 549 * Exception table
 550 */
 551#define EXCEPTION_TABLE(align)                                          \
 552        . = ALIGN(align);                                               \
 553        __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {               \
 554                VMLINUX_SYMBOL(__start___ex_table) = .;                 \
 555                KEEP(*(__ex_table))                                     \
 556                VMLINUX_SYMBOL(__stop___ex_table) = .;                  \
 557        }
 558
 559/*
 560 * Init task
 561 */
 562#define INIT_TASK_DATA_SECTION(align)                                   \
 563        . = ALIGN(align);                                               \
 564        .data..init_task :  AT(ADDR(.data..init_task) - LOAD_OFFSET) {  \
 565                INIT_TASK_DATA(align)                                   \
 566        }
 567
 568#ifdef CONFIG_CONSTRUCTORS
 569#define KERNEL_CTORS()  . = ALIGN(8);                      \
 570                        VMLINUX_SYMBOL(__ctors_start) = .; \
 571                        KEEP(*(.ctors))                    \
 572                        KEEP(*(SORT(.init_array.*)))       \
 573                        KEEP(*(.init_array))               \
 574                        VMLINUX_SYMBOL(__ctors_end) = .;
 575#else
 576#define KERNEL_CTORS()
 577#endif
 578
 579/* init and exit section handling */
 580#define INIT_DATA                                                       \
 581        KEEP(*(SORT(___kentry+*)))                                      \
 582        *(.init.data)                                                   \
 583        MEM_DISCARD(init.data)                                          \
 584        KERNEL_CTORS()                                                  \
 585        MCOUNT_REC()                                                    \
 586        *(.init.rodata)                                                 \
 587        FTRACE_EVENTS()                                                 \
 588        TRACE_SYSCALLS()                                                \
 589        KPROBE_BLACKLIST()                                              \
 590        ERROR_INJECT_WHITELIST()                                        \
 591        MEM_DISCARD(init.rodata)                                        \
 592        CLK_OF_TABLES()                                                 \
 593        RESERVEDMEM_OF_TABLES()                                         \
 594        TIMER_OF_TABLES()                                               \
 595        IOMMU_OF_TABLES()                                               \
 596        CPU_METHOD_OF_TABLES()                                          \
 597        CPUIDLE_METHOD_OF_TABLES()                                      \
 598        KERNEL_DTB()                                                    \
 599        IRQCHIP_OF_MATCH_TABLE()                                        \
 600        ACPI_PROBE_TABLE(irqchip)                                       \
 601        ACPI_PROBE_TABLE(timer)                                         \
 602        EARLYCON_TABLE()
 603
 604#define INIT_TEXT                                                       \
 605        *(.init.text)                                                   \
 606        *(.text.startup)                                                \
 607        MEM_DISCARD(init.text)
 608
 609#define EXIT_DATA                                                       \
 610        *(.exit.data)                                                   \
 611        *(.fini_array)                                                  \
 612        *(.dtors)                                                       \
 613        MEM_DISCARD(exit.data)                                          \
 614        MEM_DISCARD(exit.rodata)
 615
 616#define EXIT_TEXT                                                       \
 617        *(.exit.text)                                                   \
 618        *(.text.exit)                                                   \
 619        MEM_DISCARD(exit.text)
 620
 621#define EXIT_CALL                                                       \
 622        *(.exitcall.exit)
 623
 624/*
 625 * bss (Block Started by Symbol) - uninitialized data
 626 * zeroed during startup
 627 */
 628#define SBSS(sbss_align)                                                \
 629        . = ALIGN(sbss_align);                                          \
 630        .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {                         \
 631                *(.dynsbss)                                             \
 632                *(.sbss)                                                \
 633                *(.scommon)                                             \
 634        }
 635
 636/*
 637 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
 638 * sections to the front of bss.
 639 */
 640#ifndef BSS_FIRST_SECTIONS
 641#define BSS_FIRST_SECTIONS
 642#endif
 643
 644#define BSS(bss_align)                                                  \
 645        . = ALIGN(bss_align);                                           \
 646        .bss : AT(ADDR(.bss) - LOAD_OFFSET) {                           \
 647                BSS_FIRST_SECTIONS                                      \
 648                *(.bss..page_aligned)                                   \
 649                *(.dynbss)                                              \
 650                *(BSS_MAIN)                                             \
 651                *(COMMON)                                               \
 652        }
 653
 654/*
 655 * DWARF debug sections.
 656 * Symbols in the DWARF debugging sections are relative to
 657 * the beginning of the section so we begin them at 0.
 658 */
 659#define DWARF_DEBUG                                                     \
 660                /* DWARF 1 */                                           \
 661                .debug          0 : { *(.debug) }                       \
 662                .line           0 : { *(.line) }                        \
 663                /* GNU DWARF 1 extensions */                            \
 664                .debug_srcinfo  0 : { *(.debug_srcinfo) }               \
 665                .debug_sfnames  0 : { *(.debug_sfnames) }               \
 666                /* DWARF 1.1 and DWARF 2 */                             \
 667                .debug_aranges  0 : { *(.debug_aranges) }               \
 668                .debug_pubnames 0 : { *(.debug_pubnames) }              \
 669                /* DWARF 2 */                                           \
 670                .debug_info     0 : { *(.debug_info                     \
 671                                .gnu.linkonce.wi.*) }                   \
 672                .debug_abbrev   0 : { *(.debug_abbrev) }                \
 673                .debug_line     0 : { *(.debug_line) }                  \
 674                .debug_frame    0 : { *(.debug_frame) }                 \
 675                .debug_str      0 : { *(.debug_str) }                   \
 676                .debug_loc      0 : { *(.debug_loc) }                   \
 677                .debug_macinfo  0 : { *(.debug_macinfo) }               \
 678                .debug_pubtypes 0 : { *(.debug_pubtypes) }              \
 679                /* DWARF 3 */                                           \
 680                .debug_ranges   0 : { *(.debug_ranges) }                \
 681                /* SGI/MIPS DWARF 2 extensions */                       \
 682                .debug_weaknames 0 : { *(.debug_weaknames) }            \
 683                .debug_funcnames 0 : { *(.debug_funcnames) }            \
 684                .debug_typenames 0 : { *(.debug_typenames) }            \
 685                .debug_varnames  0 : { *(.debug_varnames) }             \
 686                /* GNU DWARF 2 extensions */                            \
 687                .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) }      \
 688                .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) }      \
 689                /* DWARF 4 */                                           \
 690                .debug_types    0 : { *(.debug_types) }                 \
 691                /* DWARF 5 */                                           \
 692                .debug_macro    0 : { *(.debug_macro) }                 \
 693                .debug_addr     0 : { *(.debug_addr) }
 694
 695                /* Stabs debugging sections.  */
 696#define STABS_DEBUG                                                     \
 697                .stab 0 : { *(.stab) }                                  \
 698                .stabstr 0 : { *(.stabstr) }                            \
 699                .stab.excl 0 : { *(.stab.excl) }                        \
 700                .stab.exclstr 0 : { *(.stab.exclstr) }                  \
 701                .stab.index 0 : { *(.stab.index) }                      \
 702                .stab.indexstr 0 : { *(.stab.indexstr) }                \
 703                .comment 0 : { *(.comment) }
 704
 705#ifdef CONFIG_GENERIC_BUG
 706#define BUG_TABLE                                                       \
 707        . = ALIGN(8);                                                   \
 708        __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {             \
 709                VMLINUX_SYMBOL(__start___bug_table) = .;                \
 710                KEEP(*(__bug_table))                                    \
 711                VMLINUX_SYMBOL(__stop___bug_table) = .;                 \
 712        }
 713#else
 714#define BUG_TABLE
 715#endif
 716
 717#ifdef CONFIG_UNWINDER_ORC
 718#define ORC_UNWIND_TABLE                                                \
 719        . = ALIGN(4);                                                   \
 720        .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) {       \
 721                VMLINUX_SYMBOL(__start_orc_unwind_ip) = .;              \
 722                KEEP(*(.orc_unwind_ip))                                 \
 723                VMLINUX_SYMBOL(__stop_orc_unwind_ip) = .;               \
 724        }                                                               \
 725        . = ALIGN(6);                                                   \
 726        .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) {             \
 727                VMLINUX_SYMBOL(__start_orc_unwind) = .;                 \
 728                KEEP(*(.orc_unwind))                                    \
 729                VMLINUX_SYMBOL(__stop_orc_unwind) = .;                  \
 730        }                                                               \
 731        . = ALIGN(4);                                                   \
 732        .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) {             \
 733                VMLINUX_SYMBOL(orc_lookup) = .;                         \
 734                . += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) /        \
 735                        LOOKUP_BLOCK_SIZE) + 1) * 4;                    \
 736                VMLINUX_SYMBOL(orc_lookup_end) = .;                     \
 737        }
 738#else
 739#define ORC_UNWIND_TABLE
 740#endif
 741
 742#ifdef CONFIG_PM_TRACE
 743#define TRACEDATA                                                       \
 744        . = ALIGN(4);                                                   \
 745        .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {               \
 746                VMLINUX_SYMBOL(__tracedata_start) = .;                  \
 747                KEEP(*(.tracedata))                                     \
 748                VMLINUX_SYMBOL(__tracedata_end) = .;                    \
 749        }
 750#else
 751#define TRACEDATA
 752#endif
 753
 754#define NOTES                                                           \
 755        .notes : AT(ADDR(.notes) - LOAD_OFFSET) {                       \
 756                VMLINUX_SYMBOL(__start_notes) = .;                      \
 757                *(.note.*)                                              \
 758                VMLINUX_SYMBOL(__stop_notes) = .;                       \
 759        }
 760
 761#define INIT_SETUP(initsetup_align)                                     \
 762                . = ALIGN(initsetup_align);                             \
 763                VMLINUX_SYMBOL(__setup_start) = .;                      \
 764                KEEP(*(.init.setup))                                    \
 765                VMLINUX_SYMBOL(__setup_end) = .;
 766
 767#define INIT_CALLS_LEVEL(level)                                         \
 768                VMLINUX_SYMBOL(__initcall##level##_start) = .;          \
 769                KEEP(*(.initcall##level##.init))                        \
 770                KEEP(*(.initcall##level##s.init))                       \
 771
 772#define INIT_CALLS                                                      \
 773                VMLINUX_SYMBOL(__initcall_start) = .;                   \
 774                KEEP(*(.initcallearly.init))                            \
 775                INIT_CALLS_LEVEL(0)                                     \
 776                INIT_CALLS_LEVEL(1)                                     \
 777                INIT_CALLS_LEVEL(2)                                     \
 778                INIT_CALLS_LEVEL(3)                                     \
 779                INIT_CALLS_LEVEL(4)                                     \
 780                INIT_CALLS_LEVEL(5)                                     \
 781                INIT_CALLS_LEVEL(rootfs)                                \
 782                INIT_CALLS_LEVEL(6)                                     \
 783                INIT_CALLS_LEVEL(7)                                     \
 784                VMLINUX_SYMBOL(__initcall_end) = .;
 785
 786#define CON_INITCALL                                                    \
 787                VMLINUX_SYMBOL(__con_initcall_start) = .;               \
 788                KEEP(*(.con_initcall.init))                             \
 789                VMLINUX_SYMBOL(__con_initcall_end) = .;
 790
 791#define SECURITY_INITCALL                                               \
 792                VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 793                KEEP(*(.security_initcall.init))                        \
 794                VMLINUX_SYMBOL(__security_initcall_end) = .;
 795
 796#ifdef CONFIG_BLK_DEV_INITRD
 797#define INIT_RAM_FS                                                     \
 798        . = ALIGN(4);                                                   \
 799        VMLINUX_SYMBOL(__initramfs_start) = .;                          \
 800        KEEP(*(.init.ramfs))                                            \
 801        . = ALIGN(8);                                                   \
 802        KEEP(*(.init.ramfs.info))
 803#else
 804#define INIT_RAM_FS
 805#endif
 806
 807/*
 808 * Memory encryption operates on a page basis. Since we need to clear
 809 * the memory encryption mask for this section, it needs to be aligned
 810 * on a page boundary and be a page-size multiple in length.
 811 *
 812 * Note: We use a separate section so that only this section gets
 813 * decrypted to avoid exposing more than we wish.
 814 */
 815#ifdef CONFIG_AMD_MEM_ENCRYPT
 816#define PERCPU_DECRYPTED_SECTION                                        \
 817        . = ALIGN(PAGE_SIZE);                                           \
 818        *(.data..percpu..decrypted)                                     \
 819        . = ALIGN(PAGE_SIZE);
 820#else
 821#define PERCPU_DECRYPTED_SECTION
 822#endif
 823
 824
 825/*
 826 * Default discarded sections.
 827 *
 828 * Some archs want to discard exit text/data at runtime rather than
 829 * link time due to cross-section references such as alt instructions,
 830 * bug table, eh_frame, etc.  DISCARDS must be the last of output
 831 * section definitions so that such archs put those in earlier section
 832 * definitions.
 833 */
 834#define DISCARDS                                                        \
 835        /DISCARD/ : {                                                   \
 836        EXIT_TEXT                                                       \
 837        EXIT_DATA                                                       \
 838        EXIT_CALL                                                       \
 839        *(.discard)                                                     \
 840        *(.discard.*)                                                   \
 841        }
 842
 843/**
 844 * PERCPU_INPUT - the percpu input sections
 845 * @cacheline: cacheline size
 846 *
 847 * The core percpu section names and core symbols which do not rely
 848 * directly upon load addresses.
 849 *
 850 * @cacheline is used to align subsections to avoid false cacheline
 851 * sharing between subsections for different purposes.
 852 */
 853#define PERCPU_INPUT(cacheline)                                         \
 854        VMLINUX_SYMBOL(__per_cpu_start) = .;                            \
 855        *(.data..percpu..first)                                         \
 856        . = ALIGN(PAGE_SIZE);                                           \
 857        *(.data..percpu..page_aligned)                                  \
 858        . = ALIGN(cacheline);                                           \
 859        *(.data..percpu..read_mostly)                                   \
 860        . = ALIGN(cacheline);                                           \
 861        *(.data..percpu)                                                \
 862        *(.data..percpu..shared_aligned)                                \
 863        PERCPU_DECRYPTED_SECTION                                        \
 864        VMLINUX_SYMBOL(__per_cpu_end) = .;
 865
 866/**
 867 * PERCPU_VADDR - define output section for percpu area
 868 * @cacheline: cacheline size
 869 * @vaddr: explicit base address (optional)
 870 * @phdr: destination PHDR (optional)
 871 *
 872 * Macro which expands to output section for percpu area.
 873 *
 874 * @cacheline is used to align subsections to avoid false cacheline
 875 * sharing between subsections for different purposes.
 876 *
 877 * If @vaddr is not blank, it specifies explicit base address and all
 878 * percpu symbols will be offset from the given address.  If blank,
 879 * @vaddr always equals @laddr + LOAD_OFFSET.
 880 *
 881 * @phdr defines the output PHDR to use if not blank.  Be warned that
 882 * output PHDR is sticky.  If @phdr is specified, the next output
 883 * section in the linker script will go there too.  @phdr should have
 884 * a leading colon.
 885 *
 886 * Note that this macros defines __per_cpu_load as an absolute symbol.
 887 * If there is no need to put the percpu section at a predetermined
 888 * address, use PERCPU_SECTION.
 889 */
 890#define PERCPU_VADDR(cacheline, vaddr, phdr)                            \
 891        VMLINUX_SYMBOL(__per_cpu_load) = .;                             \
 892        .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load)         \
 893                                - LOAD_OFFSET) {                        \
 894                PERCPU_INPUT(cacheline)                                 \
 895        } phdr                                                          \
 896        . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
 897
 898/**
 899 * PERCPU_SECTION - define output section for percpu area, simple version
 900 * @cacheline: cacheline size
 901 *
 902 * Align to PAGE_SIZE and outputs output section for percpu area.  This
 903 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
 904 * __per_cpu_start will be identical.
 905 *
 906 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
 907 * except that __per_cpu_load is defined as a relative symbol against
 908 * .data..percpu which is required for relocatable x86_32 configuration.
 909 */
 910#define PERCPU_SECTION(cacheline)                                       \
 911        . = ALIGN(PAGE_SIZE);                                           \
 912        .data..percpu   : AT(ADDR(.data..percpu) - LOAD_OFFSET) {       \
 913                VMLINUX_SYMBOL(__per_cpu_load) = .;                     \
 914                PERCPU_INPUT(cacheline)                                 \
 915        }
 916
 917
 918/*
 919 * Definition of the high level *_SECTION macros
 920 * They will fit only a subset of the architectures
 921 */
 922
 923
 924/*
 925 * Writeable data.
 926 * All sections are combined in a single .data section.
 927 * The sections following CONSTRUCTORS are arranged so their
 928 * typical alignment matches.
 929 * A cacheline is typical/always less than a PAGE_SIZE so
 930 * the sections that has this restriction (or similar)
 931 * is located before the ones requiring PAGE_SIZE alignment.
 932 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
 933 * matches the requirement of PAGE_ALIGNED_DATA.
 934 *
 935 * use 0 as page_align if page_aligned data is not used */
 936#define RW_DATA_SECTION(cacheline, pagealigned, inittask)               \
 937        . = ALIGN(PAGE_SIZE);                                           \
 938        .data : AT(ADDR(.data) - LOAD_OFFSET) {                         \
 939                INIT_TASK_DATA(inittask)                                \
 940                NOSAVE_DATA                                             \
 941                PAGE_ALIGNED_DATA(pagealigned)                          \
 942                CACHELINE_ALIGNED_DATA(cacheline)                       \
 943                READ_MOSTLY_DATA(cacheline)                             \
 944                DATA_DATA                                               \
 945                CONSTRUCTORS                                            \
 946        }                                                               \
 947        BUG_TABLE                                                       \
 948
 949#define INIT_TEXT_SECTION(inittext_align)                               \
 950        . = ALIGN(inittext_align);                                      \
 951        .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {               \
 952                VMLINUX_SYMBOL(_sinittext) = .;                         \
 953                INIT_TEXT                                               \
 954                VMLINUX_SYMBOL(_einittext) = .;                         \
 955        }
 956
 957#define INIT_DATA_SECTION(initsetup_align)                              \
 958        .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {               \
 959                INIT_DATA                                               \
 960                INIT_SETUP(initsetup_align)                             \
 961                INIT_CALLS                                              \
 962                CON_INITCALL                                            \
 963                SECURITY_INITCALL                                       \
 964                INIT_RAM_FS                                             \
 965        }
 966
 967#define BSS_SECTION(sbss_align, bss_align, stop_align)                  \
 968        . = ALIGN(sbss_align);                                          \
 969        VMLINUX_SYMBOL(__bss_start) = .;                                \
 970        SBSS(sbss_align)                                                \
 971        BSS(bss_align)                                                  \
 972        . = ALIGN(stop_align);                                          \
 973        VMLINUX_SYMBOL(__bss_stop) = .;
 974