include/asm-generic/vmlinux.lds.h

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