kernel/include/asm-generic/vmlinux.lds.h

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