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