include/asm-generic/vmlinux.lds.h

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