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