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 #else
 129 #define FTRACE_EVENTS()
 130 #endif
 131
 132 #ifdef CONFIG_TRACING
 133 #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .;      \
 134                          *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \
 135                          VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;
 136 #define TRACEPOINT_STR() VMLINUX_SYMBOL(__start___tracepoint_str) = .;  \
 137                          *(__tracepoint_str) /* Trace_printk fmt' pointer */ \
 138                          VMLINUX_SYMBOL(__stop___tracepoint_str) = .;
 139 #else
 140 #define TRACE_PRINTKS()
 141 #define TRACEPOINT_STR()
 142 #endif
 143
 144 #ifdef CONFIG_FTRACE_SYSCALLS
 145 #define TRACE_SYSCALLS() . = ALIGN(8);                                  \
 146                          VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \
 147                          *(__syscalls_metadata)                         \
 148                          VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
 149 #else
 150 #define TRACE_SYSCALLS()
 151 #endif
 152
 153
 154 #define ___OF_TABLE(cfg, name)  _OF_TABLE_##cfg(name)
 155 #define __OF_TABLE(cfg, name)   ___OF_TABLE(cfg, name)
 156 #define OF_TABLE(cfg, name)     __OF_TABLE(config_enabled(cfg), name)
 157 #define _OF_TABLE_0(name)
 158 #define _OF_TABLE_1(name)                                               \
 159         . = ALIGN(8);                                                   \
 160         VMLINUX_SYMBOL(__##name##_of_table) = .;                        \
 161         *(__##name##_of_table)                                          \
 162         *(__##name##_of_table_end)
 163
 164 #define CLKSRC_OF_TABLES()      OF_TABLE(CONFIG_CLKSRC_OF, clksrc)
 165 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
 166 #define CLK_OF_TABLES()         OF_TABLE(CONFIG_COMMON_CLK, clk)
 167 #define IOMMU_OF_TABLES()       OF_TABLE(CONFIG_OF_IOMMU, iommu)
 168 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
 169 #define CPU_METHOD_OF_TABLES()  OF_TABLE(CONFIG_SMP, cpu_method)
 170 #define EARLYCON_OF_TABLES()    OF_TABLE(CONFIG_SERIAL_EARLYCON, earlycon)
 171
 172 #define KERNEL_DTB()                                                    \
 173         STRUCT_ALIGN();                                                 \
 174         VMLINUX_SYMBOL(__dtb_start) = .;                                \
 175         *(.dtb.init.rodata)                                             \
 176         VMLINUX_SYMBOL(__dtb_end) = .;
 177
 178 /* .data section */
 179 #define DATA_DATA                                                       \
 180         *(.data)                                                        \
 181         *(.ref.data)                                                    \
 182         *(.data..shared_aligned) /* percpu related */                   \
 183         MEM_KEEP(init.data)                                             \
 184         MEM_KEEP(exit.data)                                             \
 185         *(.data.unlikely)                                               \
 186         STRUCT_ALIGN();                                                 \
 187         *(__tracepoints)                                                \
 188         /* implement dynamic printk debug */                            \
 189         . = ALIGN(8);                                                   \
 190         VMLINUX_SYMBOL(__start___jump_table) = .;                       \
 191         *(__jump_table)                                                 \
 192         VMLINUX_SYMBOL(__stop___jump_table) = .;                        \
 193         . = ALIGN(8);                                                   \
 194         VMLINUX_SYMBOL(__start___verbose) = .;                          \
 195         *(__verbose)                                                    \
 196         VMLINUX_SYMBOL(__stop___verbose) = .;                           \
 197         LIKELY_PROFILE()                                                \
 198         BRANCH_PROFILE()                                                \
 199         TRACE_PRINTKS()                                                 \
 200         TRACEPOINT_STR()
 201
 202 /*
 203  * Data section helpers
 204  */
 205 #define NOSAVE_DATA                                                     \
 206         . = ALIGN(PAGE_SIZE);                                           \
 207         VMLINUX_SYMBOL(__nosave_begin) = .;                             \
 208         *(.data..nosave)                                                \
 209         . = ALIGN(PAGE_SIZE);                                           \
 210         VMLINUX_SYMBOL(__nosave_end) = .;
 211
 212 #define PAGE_ALIGNED_DATA(page_align)                                   \
 213         . = ALIGN(page_align);                                          \
 214         *(.data..page_aligned)
 215
 216 #define READ_MOSTLY_DATA(align)                                         \
 217         . = ALIGN(align);                                               \
 218         *(.data..read_mostly)                                           \
 219         . = ALIGN(align);
 220
 221 #define CACHELINE_ALIGNED_DATA(align)                                   \
 222         . = ALIGN(align);                                               \
 223         *(.data..cacheline_aligned)
 224
 225 #define INIT_TASK_DATA(align)                                           \
 226         . = ALIGN(align);                                               \
 227         *(.data..init_task)
 228
 229 /*
 230  * Read only Data
 231  */
 232 #define RO_DATA_SECTION(align)                                          \
 233         . = ALIGN((align));                                             \
 234         .rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {           \
 235                 VMLINUX_SYMBOL(__start_rodata) = .;                     \
 236                 *(.rodata) *(.rodata.*)                                 \
 237                 *(__vermagic)           /* Kernel version magic */      \
 238                 . = ALIGN(8);                                           \
 239                 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .;         \
 240                 *(__tracepoints_ptrs)   /* Tracepoints: pointer array */\
 241                 VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .;          \
 242                 *(__tracepoints_strings)/* Tracepoints: strings */      \
 243         }                                                               \
 244                                                                         \
 245         .rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {          \
 246                 *(.rodata1)                                             \
 247         }                                                               \
 248                                                                         \
 249         BUG_TABLE                                                       \
 250                                                                         \
 251         /* PCI quirks */                                                \
 252         .pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {        \
 253                 VMLINUX_SYMBOL(__start_pci_fixups_early) = .;           \
 254                 *(.pci_fixup_early)                                     \
 255                 VMLINUX_SYMBOL(__end_pci_fixups_early) = .;             \
 256                 VMLINUX_SYMBOL(__start_pci_fixups_header) = .;          \
 257                 *(.pci_fixup_header)                                    \
 258                 VMLINUX_SYMBOL(__end_pci_fixups_header) = .;            \
 259                 VMLINUX_SYMBOL(__start_pci_fixups_final) = .;           \
 260                 *(.pci_fixup_final)                                     \
 261                 VMLINUX_SYMBOL(__end_pci_fixups_final) = .;             \
 262                 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .;          \
 263                 *(.pci_fixup_enable)                                    \
 264                 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .;            \
 265                 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .;          \
 266                 *(.pci_fixup_resume)                                    \
 267                 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .;            \
 268                 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .;    \
 269                 *(.pci_fixup_resume_early)                              \
 270                 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .;      \
 271                 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .;         \
 272                 *(.pci_fixup_suspend)                                   \
 273                 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .;           \
 274                 VMLINUX_SYMBOL(__start_pci_fixups_suspend_late) = .;    \
 275                 *(.pci_fixup_suspend_late)                              \
 276                 VMLINUX_SYMBOL(__end_pci_fixups_suspend_late) = .;      \
 277         }                                                               \
 278                                                                         \
 279         /* Built-in firmware blobs */                                   \
 280         .builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {      \
 281                 VMLINUX_SYMBOL(__start_builtin_fw) = .;                 \
 282                 *(.builtin_fw)                                          \
 283                 VMLINUX_SYMBOL(__end_builtin_fw) = .;                   \
 284         }                                                               \
 285                                                                         \
 286         TRACEDATA                                                       \
 287                                                                         \
 288         /* Kernel symbol table: Normal symbols */                       \
 289         __ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {         \
 290                 VMLINUX_SYMBOL(__start___ksymtab) = .;                  \
 291                 *(SORT(___ksymtab+*))                                   \
 292                 VMLINUX_SYMBOL(__stop___ksymtab) = .;                   \
 293         }                                                               \
 294                                                                         \
 295         /* Kernel symbol table: GPL-only symbols */                     \
 296         __ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {     \
 297                 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .;              \
 298                 *(SORT(___ksymtab_gpl+*))                               \
 299                 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .;               \
 300         }                                                               \
 301                                                                         \
 302         /* Kernel symbol table: Normal unused symbols */                \
 303         __ksymtab_unused  : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) {  \
 304                 VMLINUX_SYMBOL(__start___ksymtab_unused) = .;           \
 305                 *(SORT(___ksymtab_unused+*))                            \
 306                 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .;            \
 307         }                                                               \
 308                                                                         \
 309         /* Kernel symbol table: GPL-only unused symbols */              \
 310         __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
 311                 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .;       \
 312                 *(SORT(___ksymtab_unused_gpl+*))                        \
 313                 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .;        \
 314         }                                                               \
 315                                                                         \
 316         /* Kernel symbol table: GPL-future-only symbols */              \
 317         __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
 318                 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .;       \
 319                 *(SORT(___ksymtab_gpl_future+*))                        \
 320                 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .;        \
 321         }                                                               \
 322                                                                         \
 323         /* Kernel symbol table: Normal symbols */                       \
 324         __kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {         \
 325                 VMLINUX_SYMBOL(__start___kcrctab) = .;                  \
 326                 *(SORT(___kcrctab+*))                                   \
 327                 VMLINUX_SYMBOL(__stop___kcrctab) = .;                   \
 328         }                                                               \
 329                                                                         \
 330         /* Kernel symbol table: GPL-only symbols */                     \
 331         __kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {     \
 332                 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .;              \
 333                 *(SORT(___kcrctab_gpl+*))                               \
 334                 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .;               \
 335         }                                                               \
 336                                                                         \
 337         /* Kernel symbol table: Normal unused symbols */                \
 338         __kcrctab_unused  : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) {  \
 339                 VMLINUX_SYMBOL(__start___kcrctab_unused) = .;           \
 340                 *(SORT(___kcrctab_unused+*))                            \
 341                 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .;            \
 342         }                                                               \
 343                                                                         \
 344         /* Kernel symbol table: GPL-only unused symbols */              \
 345         __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
 346                 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .;       \
 347                 *(SORT(___kcrctab_unused_gpl+*))                        \
 348                 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .;        \
 349         }                                                               \
 350                                                                         \
 351         /* Kernel symbol table: GPL-future-only symbols */              \
 352         __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
 353                 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .;       \
 354                 *(SORT(___kcrctab_gpl_future+*))                        \
 355                 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .;        \
 356         }                                                               \
 357                                                                         \
 358         /* Kernel symbol table: strings */                              \
 359         __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
 360                 *(__ksymtab_strings)                                    \
 361         }                                                               \
 362                                                                         \
 363         /* __*init sections */                                          \
 364         __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {         \
 365                 *(.ref.rodata)                                          \
 366                 MEM_KEEP(init.rodata)                                   \
 367                 MEM_KEEP(exit.rodata)                                   \
 368         }                                                               \
 369                                                                         \
 370         /* Built-in module parameters. */                               \
 371         __param : AT(ADDR(__param) - LOAD_OFFSET) {                     \
 372                 VMLINUX_SYMBOL(__start___param) = .;                    \
 373                 *(__param)                                              \
 374                 VMLINUX_SYMBOL(__stop___param) = .;                     \
 375         }                                                               \
 376                                                                         \
 377         /* Built-in module versions. */                                 \
 378         __modver : AT(ADDR(__modver) - LOAD_OFFSET) {                   \
 379                 VMLINUX_SYMBOL(__start___modver) = .;                   \
 380                 *(__modver)                                             \
 381                 VMLINUX_SYMBOL(__stop___modver) = .;                    \
 382                 . = ALIGN((align));                                     \
 383                 VMLINUX_SYMBOL(__end_rodata) = .;                       \
 384         }                                                               \
 385         . = ALIGN((align));
 386
 387 /* RODATA & RO_DATA provided for backward compatibility.
 388  * All archs are supposed to use RO_DATA() */
 389 #define RODATA          RO_DATA_SECTION(4096)
 390 #define RO_DATA(align)  RO_DATA_SECTION(align)
 391
 392 #define SECURITY_INIT                                                   \
 393         .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
 394                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 395                 *(.security_initcall.init)                              \
 396                 VMLINUX_SYMBOL(__security_initcall_end) = .;            \
 397         }
 398
 399 /* .text section. Map to function alignment to avoid address changes
 400  * during second ld run in second ld pass when generating System.map */
 401 #define TEXT_TEXT                                                       \
 402                 ALIGN_FUNCTION();                                       \
 403                 *(.text.hot)                                            \
 404                 *(.text)                                                \
 405                 *(.ref.text)                                            \
 406         MEM_KEEP(init.text)                                             \
 407         MEM_KEEP(exit.text)                                             \
 408                 *(.text.unlikely)
 409
 410
 411 /* sched.text is aling to function alignment to secure we have same
 412  * address even at second ld pass when generating System.map */
 413 #define SCHED_TEXT                                                      \
 414                 ALIGN_FUNCTION();                                       \
 415                 VMLINUX_SYMBOL(__sched_text_start) = .;                 \
 416                 *(.sched.text)                                          \
 417                 VMLINUX_SYMBOL(__sched_text_end) = .;
 418
 419 /* spinlock.text is aling to function alignment to secure we have same
 420  * address even at second ld pass when generating System.map */
 421 #define LOCK_TEXT                                                       \
 422                 ALIGN_FUNCTION();                                       \
 423                 VMLINUX_SYMBOL(__lock_text_start) = .;                  \
 424                 *(.spinlock.text)                                       \
 425                 VMLINUX_SYMBOL(__lock_text_end) = .;
 426
 427 #define KPROBES_TEXT                                                    \
 428                 ALIGN_FUNCTION();                                       \
 429                 VMLINUX_SYMBOL(__kprobes_text_start) = .;               \
 430                 *(.kprobes.text)                                        \
 431                 VMLINUX_SYMBOL(__kprobes_text_end) = .;
 432
 433 #define ENTRY_TEXT                                                      \
 434                 ALIGN_FUNCTION();                                       \
 435                 VMLINUX_SYMBOL(__entry_text_start) = .;                 \
 436                 *(.entry.text)                                          \
 437                 VMLINUX_SYMBOL(__entry_text_end) = .;
 438
 439 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 440 #define IRQENTRY_TEXT                                                   \
 441                 ALIGN_FUNCTION();                                       \
 442                 VMLINUX_SYMBOL(__irqentry_text_start) = .;              \
 443                 *(.irqentry.text)                                       \
 444                 VMLINUX_SYMBOL(__irqentry_text_end) = .;
 445 #else
 446 #define IRQENTRY_TEXT
 447 #endif
 448
 449 /* Section used for early init (in .S files) */
 450 #define HEAD_TEXT  *(.head.text)
 451
 452 #define HEAD_TEXT_SECTION                                                       \
 453         .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {               \
 454                 HEAD_TEXT                                               \
 455         }
 456
 457 /*
 458  * Exception table
 459  */
 460 #define EXCEPTION_TABLE(align)                                          \
 461         . = ALIGN(align);                                               \
 462         __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {               \
 463                 VMLINUX_SYMBOL(__start___ex_table) = .;                 \
 464                 *(__ex_table)                                           \
 465                 VMLINUX_SYMBOL(__stop___ex_table) = .;                  \
 466         }
 467
 468 /*
 469  * Init task
 470  */
 471 #define INIT_TASK_DATA_SECTION(align)                                   \
 472         . = ALIGN(align);                                               \
 473         .data..init_task :  AT(ADDR(.data..init_task) - LOAD_OFFSET) {  \
 474                 INIT_TASK_DATA(align)                                   \
 475         }
 476
 477 #ifdef CONFIG_CONSTRUCTORS
 478 #define KERNEL_CTORS()  . = ALIGN(8);                      \
 479                         VMLINUX_SYMBOL(__ctors_start) = .; \
 480                         *(.ctors)                          \
 481                         *(SORT(.init_array.*))             \
 482                         *(.init_array)                     \
 483                         VMLINUX_SYMBOL(__ctors_end) = .;
 484 #else
 485 #define KERNEL_CTORS()
 486 #endif
 487
 488 /* init and exit section handling */
 489 #define INIT_DATA                                                       \
 490         *(.init.data)                                                   \
 491         MEM_DISCARD(init.data)                                          \
 492         KERNEL_CTORS()                                                  \
 493         MCOUNT_REC()                                                    \
 494         *(.init.rodata)                                                 \
 495         FTRACE_EVENTS()                                                 \
 496         TRACE_SYSCALLS()                                                \
 497         KPROBE_BLACKLIST()                                              \
 498         MEM_DISCARD(init.rodata)                                        \
 499         CLK_OF_TABLES()                                                 \
 500         RESERVEDMEM_OF_TABLES()                                         \
 501         CLKSRC_OF_TABLES()                                              \
 502         IOMMU_OF_TABLES()                                               \
 503         CPU_METHOD_OF_TABLES()                                          \
 504         KERNEL_DTB()                                                    \
 505         IRQCHIP_OF_MATCH_TABLE()                                        \
 506         EARLYCON_OF_TABLES()
 507
 508 #define INIT_TEXT                                                       \
 509         *(.init.text)                                                   \
 510         MEM_DISCARD(init.text)
 511
 512 #define EXIT_DATA                                                       \
 513         *(.exit.data)                                                   \
 514         MEM_DISCARD(exit.data)                                          \
 515         MEM_DISCARD(exit.rodata)
 516
 517 #define EXIT_TEXT                                                       \
 518         *(.exit.text)                                                   \
 519         MEM_DISCARD(exit.text)
 520
 521 #define EXIT_CALL                                                       \
 522         *(.exitcall.exit)
 523
 524 /*
 525  * bss (Block Started by Symbol) - uninitialized data
 526  * zeroed during startup
 527  */
 528 #define SBSS(sbss_align)                                                \
 529         . = ALIGN(sbss_align);                                          \
 530         .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {                         \
 531                 *(.sbss)                                                \
 532                 *(.scommon)                                             \
 533         }
 534
 535 /*
 536  * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
 537  * sections to the front of bss.
 538  */
 539 #ifndef BSS_FIRST_SECTIONS
 540 #define BSS_FIRST_SECTIONS
 541 #endif
 542
 543 #define BSS(bss_align)                                                  \
 544         . = ALIGN(bss_align);                                           \
 545         .bss : AT(ADDR(.bss) - LOAD_OFFSET) {                           \
 546                 BSS_FIRST_SECTIONS                                      \
 547                 *(.bss..page_aligned)                                   \
 548                 *(.dynbss)                                              \
 549                 *(.bss)                                                 \
 550                 *(COMMON)                                               \
 551         }
 552
 553 /*
 554  * DWARF debug sections.
 555  * Symbols in the DWARF debugging sections are relative to
 556  * the beginning of the section so we begin them at 0.
 557  */
 558 #define DWARF_DEBUG                                                     \
 559                 /* DWARF 1 */                                           \
 560                 .debug          0 : { *(.debug) }                       \
 561                 .line           0 : { *(.line) }                        \
 562                 /* GNU DWARF 1 extensions */                            \
 563                 .debug_srcinfo  0 : { *(.debug_srcinfo) }               \
 564                 .debug_sfnames  0 : { *(.debug_sfnames) }               \
 565                 /* DWARF 1.1 and DWARF 2 */                             \
 566                 .debug_aranges  0 : { *(.debug_aranges) }               \
 567                 .debug_pubnames 0 : { *(.debug_pubnames) }              \
 568                 /* DWARF 2 */                                           \
 569                 .debug_info     0 : { *(.debug_info                     \
 570                                 .gnu.linkonce.wi.*) }                   \
 571                 .debug_abbrev   0 : { *(.debug_abbrev) }                \
 572                 .debug_line     0 : { *(.debug_line) }                  \
 573                 .debug_frame    0 : { *(.debug_frame) }                 \
 574                 .debug_str      0 : { *(.debug_str) }                   \
 575                 .debug_loc      0 : { *(.debug_loc) }                   \
 576                 .debug_macinfo  0 : { *(.debug_macinfo) }               \
 577                 /* SGI/MIPS DWARF 2 extensions */                       \
 578                 .debug_weaknames 0 : { *(.debug_weaknames) }            \
 579                 .debug_funcnames 0 : { *(.debug_funcnames) }            \
 580                 .debug_typenames 0 : { *(.debug_typenames) }            \
 581                 .debug_varnames  0 : { *(.debug_varnames) }             \
 582
 583                 /* Stabs debugging sections.  */
 584 #define STABS_DEBUG                                                     \
 585                 .stab 0 : { *(.stab) }                                  \
 586                 .stabstr 0 : { *(.stabstr) }                            \
 587                 .stab.excl 0 : { *(.stab.excl) }                        \
 588                 .stab.exclstr 0 : { *(.stab.exclstr) }                  \
 589                 .stab.index 0 : { *(.stab.index) }                      \
 590                 .stab.indexstr 0 : { *(.stab.indexstr) }                \
 591                 .comment 0 : { *(.comment) }
 592
 593 #ifdef CONFIG_GENERIC_BUG
 594 #define BUG_TABLE                                                       \
 595         . = ALIGN(8);                                                   \
 596         __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {             \
 597                 VMLINUX_SYMBOL(__start___bug_table) = .;                \
 598                 *(__bug_table)                                          \
 599                 VMLINUX_SYMBOL(__stop___bug_table) = .;                 \
 600         }
 601 #else
 602 #define BUG_TABLE
 603 #endif
 604
 605 #ifdef CONFIG_PM_TRACE
 606 #define TRACEDATA                                                       \
 607         . = ALIGN(4);                                                   \
 608         .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {               \
 609                 VMLINUX_SYMBOL(__tracedata_start) = .;                  \
 610                 *(.tracedata)                                           \
 611                 VMLINUX_SYMBOL(__tracedata_end) = .;                    \
 612         }
 613 #else
 614 #define TRACEDATA
 615 #endif
 616
 617 #define NOTES                                                           \
 618         .notes : AT(ADDR(.notes) - LOAD_OFFSET) {                       \
 619                 VMLINUX_SYMBOL(__start_notes) = .;                      \
 620                 *(.note.*)                                              \
 621                 VMLINUX_SYMBOL(__stop_notes) = .;                       \
 622         }
 623
 624 #define INIT_SETUP(initsetup_align)                                     \
 625                 . = ALIGN(initsetup_align);                             \
 626                 VMLINUX_SYMBOL(__setup_start) = .;                      \
 627                 *(.init.setup)                                          \
 628                 VMLINUX_SYMBOL(__setup_end) = .;
 629
 630 #define INIT_CALLS_LEVEL(level)                                         \
 631                 VMLINUX_SYMBOL(__initcall##level##_start) = .;          \
 632                 *(.initcall##level##.init)                              \
 633                 *(.initcall##level##s.init)                             \
 634
 635 #define INIT_CALLS                                                      \
 636                 VMLINUX_SYMBOL(__initcall_start) = .;                   \
 637                 *(.initcallearly.init)                                  \
 638                 INIT_CALLS_LEVEL(0)                                     \
 639                 INIT_CALLS_LEVEL(1)                                     \
 640                 INIT_CALLS_LEVEL(2)                                     \
 641                 INIT_CALLS_LEVEL(3)                                     \
 642                 INIT_CALLS_LEVEL(4)                                     \
 643                 INIT_CALLS_LEVEL(5)                                     \
 644                 INIT_CALLS_LEVEL(rootfs)                                \
 645                 INIT_CALLS_LEVEL(6)                                     \
 646                 INIT_CALLS_LEVEL(7)                                     \
 647                 VMLINUX_SYMBOL(__initcall_end) = .;
 648
 649 #define CON_INITCALL                                                    \
 650                 VMLINUX_SYMBOL(__con_initcall_start) = .;               \
 651                 *(.con_initcall.init)                                   \
 652                 VMLINUX_SYMBOL(__con_initcall_end) = .;
 653
 654 #define SECURITY_INITCALL                                               \
 655                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 656                 *(.security_initcall.init)                              \
 657                 VMLINUX_SYMBOL(__security_initcall_end) = .;
 658
 659 #ifdef CONFIG_BLK_DEV_INITRD
 660 #define INIT_RAM_FS                                                     \
 661         . = ALIGN(4);                                                   \
 662         VMLINUX_SYMBOL(__initramfs_start) = .;                          \
 663         *(.init.ramfs)                                                  \
 664         . = ALIGN(8);                                                   \
 665         *(.init.ramfs.info)
 666 #else
 667 #define INIT_RAM_FS
 668 #endif
 669
 670 /*
 671  * Default discarded sections.
 672  *
 673  * Some archs want to discard exit text/data at runtime rather than
 674  * link time due to cross-section references such as alt instructions,
 675  * bug table, eh_frame, etc.  DISCARDS must be the last of output
 676  * section definitions so that such archs put those in earlier section
 677  * definitions.
 678  */
 679 #define DISCARDS                                                        \
 680         /DISCARD/ : {                                                   \
 681         EXIT_TEXT                                                       \
 682         EXIT_DATA                                                       \
 683         EXIT_CALL                                                       \
 684         *(.discard)                                                     \
 685         *(.discard.*)                                                   \
 686         }
 687
 688 /**
 689  * PERCPU_INPUT - the percpu input sections
 690  * @cacheline: cacheline size
 691  *
 692  * The core percpu section names and core symbols which do not rely
 693  * directly upon load addresses.
 694  *
 695  * @cacheline is used to align subsections to avoid false cacheline
 696  * sharing between subsections for different purposes.
 697  */
 698 #define PERCPU_INPUT(cacheline)                                         \
 699         VMLINUX_SYMBOL(__per_cpu_start) = .;                            \
 700         *(.data..percpu..first)                                         \
 701         . = ALIGN(PAGE_SIZE);                                           \
 702         *(.data..percpu..page_aligned)                                  \
 703         . = ALIGN(cacheline);                                           \
 704         *(.data..percpu..read_mostly)                                   \
 705         . = ALIGN(cacheline);                                           \
 706         *(.data..percpu)                                                \
 707         *(.data..percpu..shared_aligned)                                \
 708         VMLINUX_SYMBOL(__per_cpu_end) = .;
 709
 710 /**
 711  * PERCPU_VADDR - define output section for percpu area
 712  * @cacheline: cacheline size
 713  * @vaddr: explicit base address (optional)
 714  * @phdr: destination PHDR (optional)
 715  *
 716  * Macro which expands to output section for percpu area.
 717  *
 718  * @cacheline is used to align subsections to avoid false cacheline
 719  * sharing between subsections for different purposes.
 720  *
 721  * If @vaddr is not blank, it specifies explicit base address and all
 722  * percpu symbols will be offset from the given address.  If blank,
 723  * @vaddr always equals @laddr + LOAD_OFFSET.
 724  *
 725  * @phdr defines the output PHDR to use if not blank.  Be warned that
 726  * output PHDR is sticky.  If @phdr is specified, the next output
 727  * section in the linker script will go there too.  @phdr should have
 728  * a leading colon.
 729  *
 730  * Note that this macros defines __per_cpu_load as an absolute symbol.
 731  * If there is no need to put the percpu section at a predetermined
 732  * address, use PERCPU_SECTION.
 733  */
 734 #define PERCPU_VADDR(cacheline, vaddr, phdr)                            \
 735         VMLINUX_SYMBOL(__per_cpu_load) = .;                             \
 736         .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load)         \
 737                                 - LOAD_OFFSET) {                        \
 738                 PERCPU_INPUT(cacheline)                                 \
 739         } phdr                                                          \
 740         . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
 741
 742 /**
 743  * PERCPU_SECTION - define output section for percpu area, simple version
 744  * @cacheline: cacheline size
 745  *
 746  * Align to PAGE_SIZE and outputs output section for percpu area.  This
 747  * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
 748  * __per_cpu_start will be identical.
 749  *
 750  * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
 751  * except that __per_cpu_load is defined as a relative symbol against
 752  * .data..percpu which is required for relocatable x86_32 configuration.
 753  */
 754 #define PERCPU_SECTION(cacheline)                                       \
 755         . = ALIGN(PAGE_SIZE);                                           \
 756         .data..percpu   : AT(ADDR(.data..percpu) - LOAD_OFFSET) {       \
 757                 VMLINUX_SYMBOL(__per_cpu_load) = .;                     \
 758                 PERCPU_INPUT(cacheline)                                 \
 759         }
 760
 761
 762 /*
 763  * Definition of the high level *_SECTION macros
 764  * They will fit only a subset of the architectures
 765  */
 766
 767
 768 /*
 769  * Writeable data.
 770  * All sections are combined in a single .data section.
 771  * The sections following CONSTRUCTORS are arranged so their
 772  * typical alignment matches.
 773  * A cacheline is typical/always less than a PAGE_SIZE so
 774  * the sections that has this restriction (or similar)
 775  * is located before the ones requiring PAGE_SIZE alignment.
 776  * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
 777  * matches the requirement of PAGE_ALIGNED_DATA.
 778  *
 779  * use 0 as page_align if page_aligned data is not used */
 780 #define RW_DATA_SECTION(cacheline, pagealigned, inittask)               \
 781         . = ALIGN(PAGE_SIZE);                                           \
 782         .data : AT(ADDR(.data) - LOAD_OFFSET) {                         \
 783                 INIT_TASK_DATA(inittask)                                \
 784                 NOSAVE_DATA                                             \
 785                 PAGE_ALIGNED_DATA(pagealigned)                          \
 786                 CACHELINE_ALIGNED_DATA(cacheline)                       \
 787                 READ_MOSTLY_DATA(cacheline)                             \
 788                 DATA_DATA                                               \
 789                 CONSTRUCTORS                                            \
 790         }
 791
 792 #define INIT_TEXT_SECTION(inittext_align)                               \
 793         . = ALIGN(inittext_align);                                      \
 794         .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {               \
 795                 VMLINUX_SYMBOL(_sinittext) = .;                         \
 796                 INIT_TEXT                                               \
 797                 VMLINUX_SYMBOL(_einittext) = .;                         \
 798         }
 799
 800 #define INIT_DATA_SECTION(initsetup_align)                              \
 801         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {               \
 802                 INIT_DATA                                               \
 803                 INIT_SETUP(initsetup_align)                             \
 804                 INIT_CALLS                                              \
 805                 CON_INITCALL                                            \
 806                 SECURITY_INITCALL                                       \
 807                 INIT_RAM_FS                                             \
 808         }
 809
 810 #define BSS_SECTION(sbss_align, bss_align, stop_align)                  \
 811         . = ALIGN(sbss_align);                                          \
 812         VMLINUX_SYMBOL(__bss_start) = .;                                \
 813         SBSS(sbss_align)                                                \
 814         BSS(bss_align)                                                  \
 815         . = ALIGN(stop_align);                                          \
 816         VMLINUX_SYMBOL(__bss_stop) = .;