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