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(PAGE_SIZE)
  27  *      RW_DATA(...)
  28  *      _edata = .;
  29  *
  30  *      EXCEPTION_TABLE(...)
  31  *
  32  *      BSS_SECTION(0, 0, 0)
  33  *      _end = .;
  34  *
  35  *      STABS_DEBUG
  36  *      DWARF_DEBUG
  37  *      ELF_DETAILS
  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 /*
  58  * Only some architectures want to have the .notes segment visible in
  59  * a separate PT_NOTE ELF Program Header. When this happens, it needs
  60  * to be visible in both the kernel text's PT_LOAD and the PT_NOTE
  61  * Program Headers. In this case, though, the PT_LOAD needs to be made
  62  * the default again so that all the following sections don't also end
  63  * up in the PT_NOTE Program Header.
  64  */
  65 #ifdef EMITS_PT_NOTE
  66 #define NOTES_HEADERS           :text :note
  67 #define NOTES_HEADERS_RESTORE   __restore_ph : { *(.__restore_ph) } :text
  68 #else
  69 #define NOTES_HEADERS
  70 #define NOTES_HEADERS_RESTORE
  71 #endif
  72
  73 /*
  74  * Some architectures have non-executable read-only exception tables.
  75  * They can be added to the RO_DATA segment by specifying their desired
  76  * alignment.
  77  */
  78 #ifdef RO_EXCEPTION_TABLE_ALIGN
  79 #define RO_EXCEPTION_TABLE      EXCEPTION_TABLE(RO_EXCEPTION_TABLE_ALIGN)
  80 #else
  81 #define RO_EXCEPTION_TABLE
  82 #endif
  83
  84 /* Align . function alignment. */
  85 #define ALIGN_FUNCTION()  . = ALIGN(CONFIG_FUNCTION_ALIGNMENT)
  86
  87 /*
  88  * LD_DEAD_CODE_DATA_ELIMINATION option enables -fdata-sections, which
  89  * generates .data.identifier sections, which need to be pulled in with
  90  * .data. We don't want to pull in .data..other sections, which Linux
  91  * has defined. Same for text and bss.
  92  *
  93  * With LTO_CLANG, the linker also splits sections by default, so we need
  94  * these macros to combine the sections during the final link.
  95  *
  96  * RODATA_MAIN is not used because existing code already defines .rodata.x
  97  * sections to be brought in with rodata.
  98  */
  99 #if defined(CONFIG_LD_DEAD_CODE_DATA_ELIMINATION) || defined(CONFIG_LTO_CLANG)
 100 #define TEXT_MAIN .text .text.[0-9a-zA-Z_]*
 101 #define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..L* .data..compoundliteral* .data.$__unnamed_* .data.$L*
 102 #define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]*
 103 #define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]* .rodata..L*
 104 #define BSS_MAIN .bss .bss.[0-9a-zA-Z_]* .bss..compoundliteral*
 105 #define SBSS_MAIN .sbss .sbss.[0-9a-zA-Z_]*
 106 #else
 107 #define TEXT_MAIN .text
 108 #define DATA_MAIN .data
 109 #define SDATA_MAIN .sdata
 110 #define RODATA_MAIN .rodata
 111 #define BSS_MAIN .bss
 112 #define SBSS_MAIN .sbss
 113 #endif
 114
 115 /*
 116  * GCC 4.5 and later have a 32 bytes section alignment for structures.
 117  * Except GCC 4.9, that feels the need to align on 64 bytes.
 118  */
 119 #define STRUCT_ALIGNMENT 32
 120 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
 121
 122 /*
 123  * The order of the sched class addresses are important, as they are
 124  * used to determine the order of the priority of each sched class in
 125  * relation to each other.
 126  */
 127 #define SCHED_DATA                              \
 128         STRUCT_ALIGN();                         \
 129         __sched_class_highest = .;              \
 130         *(__stop_sched_class)                   \
 131         *(__dl_sched_class)                     \
 132         *(__rt_sched_class)                     \
 133         *(__fair_sched_class)                   \
 134         *(__idle_sched_class)                   \
 135         __sched_class_lowest = .;
 136
 137 /* The actual configuration determine if the init/exit sections
 138  * are handled as text/data or they can be discarded (which
 139  * often happens at runtime)
 140  */
 141 #ifdef CONFIG_HOTPLUG_CPU
 142 #define CPU_KEEP(sec)    *(.cpu##sec)
 143 #define CPU_DISCARD(sec)
 144 #else
 145 #define CPU_KEEP(sec)
 146 #define CPU_DISCARD(sec) *(.cpu##sec)
 147 #endif
 148
 149 #if defined(CONFIG_MEMORY_HOTPLUG)
 150 #define MEM_KEEP(sec)    *(.mem##sec)
 151 #define MEM_DISCARD(sec)
 152 #else
 153 #define MEM_KEEP(sec)
 154 #define MEM_DISCARD(sec) *(.mem##sec)
 155 #endif
 156
 157 #ifndef CONFIG_HAVE_DYNAMIC_FTRACE_NO_PATCHABLE
 158 #define KEEP_PATCHABLE          KEEP(*(__patchable_function_entries))
 159 #define PATCHABLE_DISCARDS
 160 #else
 161 #define KEEP_PATCHABLE
 162 #define PATCHABLE_DISCARDS      *(__patchable_function_entries)
 163 #endif
 164
 165 #ifndef CONFIG_ARCH_SUPPORTS_CFI_CLANG
 166 /*
 167  * Simply points to ftrace_stub, but with the proper protocol.
 168  * Defined by the linker script in linux/vmlinux.lds.h
 169  */
 170 #define FTRACE_STUB_HACK        ftrace_stub_graph = ftrace_stub;
 171 #else
 172 #define FTRACE_STUB_HACK
 173 #endif
 174
 175 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
 176 /*
 177  * The ftrace call sites are logged to a section whose name depends on the
 178  * compiler option used. A given kernel image will only use one, AKA
 179  * FTRACE_CALLSITE_SECTION. We capture all of them here to avoid header
 180  * dependencies for FTRACE_CALLSITE_SECTION's definition.
 181  *
 182  * ftrace_ops_list_func will be defined as arch_ftrace_ops_list_func
 183  * as some archs will have a different prototype for that function
 184  * but ftrace_ops_list_func() will have a single prototype.
 185  */
 186 #define MCOUNT_REC()    . = ALIGN(8);                           \
 187                         __start_mcount_loc = .;                 \
 188                         KEEP(*(__mcount_loc))                   \
 189                         KEEP_PATCHABLE                          \
 190                         __stop_mcount_loc = .;                  \
 191                         FTRACE_STUB_HACK                        \
 192                         ftrace_ops_list_func = arch_ftrace_ops_list_func;
 193 #else
 194 # ifdef CONFIG_FUNCTION_TRACER
 195 #  define MCOUNT_REC()  FTRACE_STUB_HACK                        \
 196                         ftrace_ops_list_func = arch_ftrace_ops_list_func;
 197 # else
 198 #  define MCOUNT_REC()
 199 # endif
 200 #endif
 201
 202 #define BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_)       \
 203         _BEGIN_##_label_ = .;                                           \
 204         KEEP(*(_sec_))                                                  \
 205         _END_##_label_ = .;
 206
 207 #define BOUNDED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_)      \
 208         _label_##_BEGIN_ = .;                                           \
 209         KEEP(*(_sec_))                                                  \
 210         _label_##_END_ = .;
 211
 212 #define BOUNDED_SECTION_BY(_sec_, _label_)                              \
 213         BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, __start, __stop)
 214
 215 #define BOUNDED_SECTION(_sec)    BOUNDED_SECTION_BY(_sec, _sec)
 216
 217 #define HEADERED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_, _HDR_) \
 218         _HDR_##_label_  = .;                                            \
 219         KEEP(*(.gnu.linkonce.##_sec_))                                  \
 220         BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_)
 221
 222 #define HEADERED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_, _HDR_) \
 223         _label_##_HDR_ = .;                                             \
 224         KEEP(*(.gnu.linkonce.##_sec_))                                  \
 225         BOUNDED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_)
 226
 227 #define HEADERED_SECTION_BY(_sec_, _label_)                             \
 228         HEADERED_SECTION_PRE_LABEL(_sec_, _label_, __start, __stop)
 229
 230 #define HEADERED_SECTION(_sec)   HEADERED_SECTION_BY(_sec, _sec)
 231
 232 #ifdef CONFIG_TRACE_BRANCH_PROFILING
 233 #define LIKELY_PROFILE()                                                \
 234         BOUNDED_SECTION_BY(_ftrace_annotated_branch, _annotated_branch_profile)
 235 #else
 236 #define LIKELY_PROFILE()
 237 #endif
 238
 239 #ifdef CONFIG_PROFILE_ALL_BRANCHES
 240 #define BRANCH_PROFILE()                                        \
 241         BOUNDED_SECTION_BY(_ftrace_branch, _branch_profile)
 242 #else
 243 #define BRANCH_PROFILE()
 244 #endif
 245
 246 #ifdef CONFIG_KPROBES
 247 #define KPROBE_BLACKLIST()                              \
 248         . = ALIGN(8);                                   \
 249         BOUNDED_SECTION(_kprobe_blacklist)
 250 #else
 251 #define KPROBE_BLACKLIST()
 252 #endif
 253
 254 #ifdef CONFIG_FUNCTION_ERROR_INJECTION
 255 #define ERROR_INJECT_WHITELIST()                        \
 256         STRUCT_ALIGN();                                 \
 257         BOUNDED_SECTION(_error_injection_whitelist)
 258 #else
 259 #define ERROR_INJECT_WHITELIST()
 260 #endif
 261
 262 #ifdef CONFIG_EVENT_TRACING
 263 #define FTRACE_EVENTS()                                                 \
 264         . = ALIGN(8);                                                   \
 265         BOUNDED_SECTION(_ftrace_events)                                 \
 266         BOUNDED_SECTION_BY(_ftrace_eval_map, _ftrace_eval_maps)
 267 #else
 268 #define FTRACE_EVENTS()
 269 #endif
 270
 271 #ifdef CONFIG_TRACING
 272 #define TRACE_PRINTKS()         BOUNDED_SECTION_BY(__trace_printk_fmt, ___trace_bprintk_fmt)
 273 #define TRACEPOINT_STR()        BOUNDED_SECTION_BY(__tracepoint_str, ___tracepoint_str)
 274 #else
 275 #define TRACE_PRINTKS()
 276 #define TRACEPOINT_STR()
 277 #endif
 278
 279 #ifdef CONFIG_FTRACE_SYSCALLS
 280 #define TRACE_SYSCALLS()                        \
 281         . = ALIGN(8);                           \
 282         BOUNDED_SECTION_BY(__syscalls_metadata, _syscalls_metadata)
 283 #else
 284 #define TRACE_SYSCALLS()
 285 #endif
 286
 287 #ifdef CONFIG_BPF_EVENTS
 288 #define BPF_RAW_TP() STRUCT_ALIGN();                            \
 289         BOUNDED_SECTION_BY(__bpf_raw_tp_map, __bpf_raw_tp)
 290 #else
 291 #define BPF_RAW_TP()
 292 #endif
 293
 294 #ifdef CONFIG_SERIAL_EARLYCON
 295 #define EARLYCON_TABLE()                                                \
 296         . = ALIGN(8);                                                   \
 297         BOUNDED_SECTION_POST_LABEL(__earlycon_table, __earlycon_table, , _end)
 298 #else
 299 #define EARLYCON_TABLE()
 300 #endif
 301
 302 #ifdef CONFIG_SECURITY
 303 #define LSM_TABLE()                                     \
 304         . = ALIGN(8);                                   \
 305         BOUNDED_SECTION_PRE_LABEL(.lsm_info.init, _lsm_info, __start, __end)
 306
 307 #define EARLY_LSM_TABLE()                                               \
 308         . = ALIGN(8);                                                   \
 309         BOUNDED_SECTION_PRE_LABEL(.early_lsm_info.init, _early_lsm_info, __start, __end)
 310 #else
 311 #define LSM_TABLE()
 312 #define EARLY_LSM_TABLE()
 313 #endif
 314
 315 #define ___OF_TABLE(cfg, name)  _OF_TABLE_##cfg(name)
 316 #define __OF_TABLE(cfg, name)   ___OF_TABLE(cfg, name)
 317 #define OF_TABLE(cfg, name)     __OF_TABLE(IS_ENABLED(cfg), name)
 318 #define _OF_TABLE_0(name)
 319 #define _OF_TABLE_1(name)                                               \
 320         . = ALIGN(8);                                                   \
 321         __##name##_of_table = .;                                        \
 322         KEEP(*(__##name##_of_table))                                    \
 323         KEEP(*(__##name##_of_table_end))
 324
 325 #define TIMER_OF_TABLES()       OF_TABLE(CONFIG_TIMER_OF, timer)
 326 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
 327 #define CLK_OF_TABLES()         OF_TABLE(CONFIG_COMMON_CLK, clk)
 328 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
 329 #define CPU_METHOD_OF_TABLES()  OF_TABLE(CONFIG_SMP, cpu_method)
 330 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method)
 331
 332 #ifdef CONFIG_ACPI
 333 #define ACPI_PROBE_TABLE(name)                                          \
 334         . = ALIGN(8);                                                   \
 335         BOUNDED_SECTION_POST_LABEL(__##name##_acpi_probe_table,         \
 336                                    __##name##_acpi_probe_table,, _end)
 337 #else
 338 #define ACPI_PROBE_TABLE(name)
 339 #endif
 340
 341 #ifdef CONFIG_THERMAL
 342 #define THERMAL_TABLE(name)                                             \
 343         . = ALIGN(8);                                                   \
 344         BOUNDED_SECTION_POST_LABEL(__##name##_thermal_table,            \
 345                                    __##name##_thermal_table,, _end)
 346 #else
 347 #define THERMAL_TABLE(name)
 348 #endif
 349
 350 #define KERNEL_DTB()                                                    \
 351         STRUCT_ALIGN();                                                 \
 352         __dtb_start = .;                                                \
 353         KEEP(*(.dtb.init.rodata))                                       \
 354         __dtb_end = .;
 355
 356 /*
 357  * .data section
 358  */
 359 #define DATA_DATA                                                       \
 360         *(.xiptext)                                                     \
 361         *(DATA_MAIN)                                                    \
 362         *(.data..decrypted)                                             \
 363         *(.ref.data)                                                    \
 364         *(.data..shared_aligned) /* percpu related */                   \
 365         MEM_KEEP(init.data*)                                            \
 366         MEM_KEEP(exit.data*)                                            \
 367         *(.data.unlikely)                                               \
 368         __start_once = .;                                               \
 369         *(.data.once)                                                   \
 370         __end_once = .;                                                 \
 371         STRUCT_ALIGN();                                                 \
 372         *(__tracepoints)                                                \
 373         /* implement dynamic printk debug */                            \
 374         . = ALIGN(8);                                                   \
 375         BOUNDED_SECTION_BY(__dyndbg_classes, ___dyndbg_classes)         \
 376         BOUNDED_SECTION_BY(__dyndbg, ___dyndbg)                         \
 377         LIKELY_PROFILE()                                                \
 378         BRANCH_PROFILE()                                                \
 379         TRACE_PRINTKS()                                                 \
 380         BPF_RAW_TP()                                                    \
 381         TRACEPOINT_STR()
 382
 383 /*
 384  * Data section helpers
 385  */
 386 #define NOSAVE_DATA                                                     \
 387         . = ALIGN(PAGE_SIZE);                                           \
 388         __nosave_begin = .;                                             \
 389         *(.data..nosave)                                                \
 390         . = ALIGN(PAGE_SIZE);                                           \
 391         __nosave_end = .;
 392
 393 #define PAGE_ALIGNED_DATA(page_align)                                   \
 394         . = ALIGN(page_align);                                          \
 395         *(.data..page_aligned)                                          \
 396         . = ALIGN(page_align);
 397
 398 #define READ_MOSTLY_DATA(align)                                         \
 399         . = ALIGN(align);                                               \
 400         *(.data..read_mostly)                                           \
 401         . = ALIGN(align);
 402
 403 #define CACHELINE_ALIGNED_DATA(align)                                   \
 404         . = ALIGN(align);                                               \
 405         *(.data..cacheline_aligned)
 406
 407 #define INIT_TASK_DATA(align)                                           \
 408         . = ALIGN(align);                                               \
 409         __start_init_task = .;                                          \
 410         init_thread_union = .;                                          \
 411         init_stack = .;                                                 \
 412         KEEP(*(.data..init_task))                                       \
 413         KEEP(*(.data..init_thread_info))                                \
 414         . = __start_init_task + THREAD_SIZE;                            \
 415         __end_init_task = .;
 416
 417 #define JUMP_TABLE_DATA                                                 \
 418         . = ALIGN(8);                                                   \
 419         BOUNDED_SECTION_BY(__jump_table, ___jump_table)
 420
 421 #ifdef CONFIG_HAVE_STATIC_CALL_INLINE
 422 #define STATIC_CALL_DATA                                                \
 423         . = ALIGN(8);                                                   \
 424         BOUNDED_SECTION_BY(.static_call_sites, _static_call_sites)      \
 425         BOUNDED_SECTION_BY(.static_call_tramp_key, _static_call_tramp_key)
 426 #else
 427 #define STATIC_CALL_DATA
 428 #endif
 429
 430 /*
 431  * Allow architectures to handle ro_after_init data on their
 432  * own by defining an empty RO_AFTER_INIT_DATA.
 433  */
 434 #ifndef RO_AFTER_INIT_DATA
 435 #define RO_AFTER_INIT_DATA                                              \
 436         . = ALIGN(8);                                                   \
 437         __start_ro_after_init = .;                                      \
 438         *(.data..ro_after_init)                                         \
 439         JUMP_TABLE_DATA                                                 \
 440         STATIC_CALL_DATA                                                \
 441         __end_ro_after_init = .;
 442 #endif
 443
 444 /*
 445  * .kcfi_traps contains a list KCFI trap locations.
 446  */
 447 #ifndef KCFI_TRAPS
 448 #ifdef CONFIG_ARCH_USES_CFI_TRAPS
 449 #define KCFI_TRAPS                                                      \
 450         __kcfi_traps : AT(ADDR(__kcfi_traps) - LOAD_OFFSET) {           \
 451                 BOUNDED_SECTION_BY(.kcfi_traps, ___kcfi_traps)          \
 452         }
 453 #else
 454 #define KCFI_TRAPS
 455 #endif
 456 #endif
 457
 458 /*
 459  * Read only Data
 460  */
 461 #define RO_DATA(align)                                                  \
 462         . = ALIGN((align));                                             \
 463         .rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {           \
 464                 __start_rodata = .;                                     \
 465                 *(.rodata) *(.rodata.*)                                 \
 466                 SCHED_DATA                                              \
 467                 RO_AFTER_INIT_DATA      /* Read only after init */      \
 468                 . = ALIGN(8);                                           \
 469                 BOUNDED_SECTION_BY(__tracepoints_ptrs, ___tracepoints_ptrs) \
 470                 *(__tracepoints_strings)/* Tracepoints: strings */      \
 471         }                                                               \
 472                                                                         \
 473         .rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {          \
 474                 *(.rodata1)                                             \
 475         }                                                               \
 476                                                                         \
 477         /* PCI quirks */                                                \
 478         .pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {        \
 479                 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_early,  _pci_fixups_early,  __start, __end) \
 480                 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_header, _pci_fixups_header, __start, __end) \
 481                 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_final,  _pci_fixups_final,  __start, __end) \
 482                 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_enable, _pci_fixups_enable, __start, __end) \
 483                 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_resume, _pci_fixups_resume, __start, __end) \
 484                 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_suspend, _pci_fixups_suspend, __start, __end) \
 485                 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_resume_early, _pci_fixups_resume_early, __start, __end) \
 486                 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_suspend_late, _pci_fixups_suspend_late, __start, __end) \
 487         }                                                               \
 488                                                                         \
 489         FW_LOADER_BUILT_IN_DATA                                         \
 490         TRACEDATA                                                       \
 491                                                                         \
 492         PRINTK_INDEX                                                    \
 493                                                                         \
 494         /* Kernel symbol table: Normal symbols */                       \
 495         __ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {         \
 496                 __start___ksymtab = .;                                  \
 497                 KEEP(*(SORT(___ksymtab+*)))                             \
 498                 __stop___ksymtab = .;                                   \
 499         }                                                               \
 500                                                                         \
 501         /* Kernel symbol table: GPL-only symbols */                     \
 502         __ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {     \
 503                 __start___ksymtab_gpl = .;                              \
 504                 KEEP(*(SORT(___ksymtab_gpl+*)))                         \
 505                 __stop___ksymtab_gpl = .;                               \
 506         }                                                               \
 507                                                                         \
 508         /* Kernel symbol table: Normal symbols */                       \
 509         __kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {         \
 510                 __start___kcrctab = .;                                  \
 511                 KEEP(*(SORT(___kcrctab+*)))                             \
 512                 __stop___kcrctab = .;                                   \
 513         }                                                               \
 514                                                                         \
 515         /* Kernel symbol table: GPL-only symbols */                     \
 516         __kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {     \
 517                 __start___kcrctab_gpl = .;                              \
 518                 KEEP(*(SORT(___kcrctab_gpl+*)))                         \
 519                 __stop___kcrctab_gpl = .;                               \
 520         }                                                               \
 521                                                                         \
 522         /* Kernel symbol table: strings */                              \
 523         __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
 524                 *(__ksymtab_strings)                                    \
 525         }                                                               \
 526                                                                         \
 527         /* __*init sections */                                          \
 528         __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {         \
 529                 *(.ref.rodata)                                          \
 530                 MEM_KEEP(init.rodata)                                   \
 531                 MEM_KEEP(exit.rodata)                                   \
 532         }                                                               \
 533                                                                         \
 534         /* Built-in module parameters. */                               \
 535         __param : AT(ADDR(__param) - LOAD_OFFSET) {                     \
 536                 BOUNDED_SECTION_BY(__param, ___param)                   \
 537         }                                                               \
 538                                                                         \
 539         /* Built-in module versions. */                                 \
 540         __modver : AT(ADDR(__modver) - LOAD_OFFSET) {                   \
 541                 BOUNDED_SECTION_BY(__modver, ___modver)                 \
 542         }                                                               \
 543                                                                         \
 544         KCFI_TRAPS                                                      \
 545                                                                         \
 546         RO_EXCEPTION_TABLE                                              \
 547         NOTES                                                           \
 548         BTF                                                             \
 549                                                                         \
 550         . = ALIGN((align));                                             \
 551         __end_rodata = .;
 552
 553
 554 /*
 555  * Non-instrumentable text section
 556  */
 557 #define NOINSTR_TEXT                                                    \
 558                 ALIGN_FUNCTION();                                       \
 559                 __noinstr_text_start = .;                               \
 560                 *(.noinstr.text)                                        \
 561                 __noinstr_text_end = .;
 562
 563 /*
 564  * .text section. Map to function alignment to avoid address changes
 565  * during second ld run in second ld pass when generating System.map
 566  *
 567  * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead
 568  * code elimination is enabled, so these sections should be converted
 569  * to use ".." first.
 570  */
 571 #define TEXT_TEXT                                                       \
 572                 ALIGN_FUNCTION();                                       \
 573                 *(.text.hot .text.hot.*)                                \
 574                 *(TEXT_MAIN .text.fixup)                                \
 575                 *(.text.unlikely .text.unlikely.*)                      \
 576                 *(.text.unknown .text.unknown.*)                        \
 577                 NOINSTR_TEXT                                            \
 578                 *(.text..refcount)                                      \
 579                 *(.ref.text)                                            \
 580                 *(.text.asan.* .text.tsan.*)                            \
 581         MEM_KEEP(init.text*)                                            \
 582         MEM_KEEP(exit.text*)                                            \
 583
 584
 585 /* sched.text is aling to function alignment to secure we have same
 586  * address even at second ld pass when generating System.map */
 587 #define SCHED_TEXT                                                      \
 588                 ALIGN_FUNCTION();                                       \
 589                 __sched_text_start = .;                                 \
 590                 *(.sched.text)                                          \
 591                 __sched_text_end = .;
 592
 593 /* spinlock.text is aling to function alignment to secure we have same
 594  * address even at second ld pass when generating System.map */
 595 #define LOCK_TEXT                                                       \
 596                 ALIGN_FUNCTION();                                       \
 597                 __lock_text_start = .;                                  \
 598                 *(.spinlock.text)                                       \
 599                 __lock_text_end = .;
 600
 601 #define CPUIDLE_TEXT                                                    \
 602                 ALIGN_FUNCTION();                                       \
 603                 __cpuidle_text_start = .;                               \
 604                 *(.cpuidle.text)                                        \
 605                 __cpuidle_text_end = .;
 606
 607 #define KPROBES_TEXT                                                    \
 608                 ALIGN_FUNCTION();                                       \
 609                 __kprobes_text_start = .;                               \
 610                 *(.kprobes.text)                                        \
 611                 __kprobes_text_end = .;
 612
 613 #define ENTRY_TEXT                                                      \
 614                 ALIGN_FUNCTION();                                       \
 615                 __entry_text_start = .;                                 \
 616                 *(.entry.text)                                          \
 617                 __entry_text_end = .;
 618
 619 #define IRQENTRY_TEXT                                                   \
 620                 ALIGN_FUNCTION();                                       \
 621                 __irqentry_text_start = .;                              \
 622                 *(.irqentry.text)                                       \
 623                 __irqentry_text_end = .;
 624
 625 #define SOFTIRQENTRY_TEXT                                               \
 626                 ALIGN_FUNCTION();                                       \
 627                 __softirqentry_text_start = .;                          \
 628                 *(.softirqentry.text)                                   \
 629                 __softirqentry_text_end = .;
 630
 631 #define STATIC_CALL_TEXT                                                \
 632                 ALIGN_FUNCTION();                                       \
 633                 __static_call_text_start = .;                           \
 634                 *(.static_call.text)                                    \
 635                 __static_call_text_end = .;
 636
 637 /* Section used for early init (in .S files) */
 638 #define HEAD_TEXT  KEEP(*(.head.text))
 639
 640 #define HEAD_TEXT_SECTION                                                       \
 641         .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {               \
 642                 HEAD_TEXT                                               \
 643         }
 644
 645 /*
 646  * Exception table
 647  */
 648 #define EXCEPTION_TABLE(align)                                          \
 649         . = ALIGN(align);                                               \
 650         __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {               \
 651                 BOUNDED_SECTION_BY(__ex_table, ___ex_table)             \
 652         }
 653
 654 /*
 655  * .BTF
 656  */
 657 #ifdef CONFIG_DEBUG_INFO_BTF
 658 #define BTF                                                             \
 659         .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) {                           \
 660                 BOUNDED_SECTION_BY(.BTF, _BTF)                          \
 661         }                                                               \
 662         . = ALIGN(4);                                                   \
 663         .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) {                   \
 664                 *(.BTF_ids)                                             \
 665         }
 666 #else
 667 #define BTF
 668 #endif
 669
 670 /*
 671  * Init task
 672  */
 673 #define INIT_TASK_DATA_SECTION(align)                                   \
 674         . = ALIGN(align);                                               \
 675         .data..init_task :  AT(ADDR(.data..init_task) - LOAD_OFFSET) {  \
 676                 INIT_TASK_DATA(align)                                   \
 677         }
 678
 679 #ifdef CONFIG_CONSTRUCTORS
 680 #define KERNEL_CTORS()  . = ALIGN(8);                      \
 681                         __ctors_start = .;                 \
 682                         KEEP(*(SORT(.ctors.*)))            \
 683                         KEEP(*(.ctors))                    \
 684                         KEEP(*(SORT(.init_array.*)))       \
 685                         KEEP(*(.init_array))               \
 686                         __ctors_end = .;
 687 #else
 688 #define KERNEL_CTORS()
 689 #endif
 690
 691 /* init and exit section handling */
 692 #define INIT_DATA                                                       \
 693         KEEP(*(SORT(___kentry+*)))                                      \
 694         *(.init.data init.data.*)                                       \
 695         MEM_DISCARD(init.data*)                                         \
 696         KERNEL_CTORS()                                                  \
 697         MCOUNT_REC()                                                    \
 698         *(.init.rodata .init.rodata.*)                                  \
 699         FTRACE_EVENTS()                                                 \
 700         TRACE_SYSCALLS()                                                \
 701         KPROBE_BLACKLIST()                                              \
 702         ERROR_INJECT_WHITELIST()                                        \
 703         MEM_DISCARD(init.rodata)                                        \
 704         CLK_OF_TABLES()                                                 \
 705         RESERVEDMEM_OF_TABLES()                                         \
 706         TIMER_OF_TABLES()                                               \
 707         CPU_METHOD_OF_TABLES()                                          \
 708         CPUIDLE_METHOD_OF_TABLES()                                      \
 709         KERNEL_DTB()                                                    \
 710         IRQCHIP_OF_MATCH_TABLE()                                        \
 711         ACPI_PROBE_TABLE(irqchip)                                       \
 712         ACPI_PROBE_TABLE(timer)                                         \
 713         THERMAL_TABLE(governor)                                         \
 714         EARLYCON_TABLE()                                                \
 715         LSM_TABLE()                                                     \
 716         EARLY_LSM_TABLE()                                               \
 717         KUNIT_TABLE()
 718
 719 #define INIT_TEXT                                                       \
 720         *(.init.text .init.text.*)                                      \
 721         *(.text.startup)                                                \
 722         MEM_DISCARD(init.text*)
 723
 724 #define EXIT_DATA                                                       \
 725         *(.exit.data .exit.data.*)                                      \
 726         *(.fini_array .fini_array.*)                                    \
 727         *(.dtors .dtors.*)                                              \
 728         MEM_DISCARD(exit.data*)                                         \
 729         MEM_DISCARD(exit.rodata*)
 730
 731 #define EXIT_TEXT                                                       \
 732         *(.exit.text)                                                   \
 733         *(.text.exit)                                                   \
 734         MEM_DISCARD(exit.text)
 735
 736 #define EXIT_CALL                                                       \
 737         *(.exitcall.exit)
 738
 739 /*
 740  * bss (Block Started by Symbol) - uninitialized data
 741  * zeroed during startup
 742  */
 743 #define SBSS(sbss_align)                                                \
 744         . = ALIGN(sbss_align);                                          \
 745         .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {                         \
 746                 *(.dynsbss)                                             \
 747                 *(SBSS_MAIN)                                            \
 748                 *(.scommon)                                             \
 749         }
 750
 751 /*
 752  * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
 753  * sections to the front of bss.
 754  */
 755 #ifndef BSS_FIRST_SECTIONS
 756 #define BSS_FIRST_SECTIONS
 757 #endif
 758
 759 #define BSS(bss_align)                                                  \
 760         . = ALIGN(bss_align);                                           \
 761         .bss : AT(ADDR(.bss) - LOAD_OFFSET) {                           \
 762                 BSS_FIRST_SECTIONS                                      \
 763                 . = ALIGN(PAGE_SIZE);                                   \
 764                 *(.bss..page_aligned)                                   \
 765                 . = ALIGN(PAGE_SIZE);                                   \
 766                 *(.dynbss)                                              \
 767                 *(BSS_MAIN)                                             \
 768                 *(COMMON)                                               \
 769         }
 770
 771 /*
 772  * DWARF debug sections.
 773  * Symbols in the DWARF debugging sections are relative to
 774  * the beginning of the section so we begin them at 0.
 775  */
 776 #define DWARF_DEBUG                                                     \
 777                 /* DWARF 1 */                                           \
 778                 .debug          0 : { *(.debug) }                       \
 779                 .line           0 : { *(.line) }                        \
 780                 /* GNU DWARF 1 extensions */                            \
 781                 .debug_srcinfo  0 : { *(.debug_srcinfo) }               \
 782                 .debug_sfnames  0 : { *(.debug_sfnames) }               \
 783                 /* DWARF 1.1 and DWARF 2 */                             \
 784                 .debug_aranges  0 : { *(.debug_aranges) }               \
 785                 .debug_pubnames 0 : { *(.debug_pubnames) }              \
 786                 /* DWARF 2 */                                           \
 787                 .debug_info     0 : { *(.debug_info                     \
 788                                 .gnu.linkonce.wi.*) }                   \
 789                 .debug_abbrev   0 : { *(.debug_abbrev) }                \
 790                 .debug_line     0 : { *(.debug_line) }                  \
 791                 .debug_frame    0 : { *(.debug_frame) }                 \
 792                 .debug_str      0 : { *(.debug_str) }                   \
 793                 .debug_loc      0 : { *(.debug_loc) }                   \
 794                 .debug_macinfo  0 : { *(.debug_macinfo) }               \
 795                 .debug_pubtypes 0 : { *(.debug_pubtypes) }              \
 796                 /* DWARF 3 */                                           \
 797                 .debug_ranges   0 : { *(.debug_ranges) }                \
 798                 /* SGI/MIPS DWARF 2 extensions */                       \
 799                 .debug_weaknames 0 : { *(.debug_weaknames) }            \
 800                 .debug_funcnames 0 : { *(.debug_funcnames) }            \
 801                 .debug_typenames 0 : { *(.debug_typenames) }            \
 802                 .debug_varnames  0 : { *(.debug_varnames) }             \
 803                 /* GNU DWARF 2 extensions */                            \
 804                 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) }      \
 805                 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) }      \
 806                 /* DWARF 4 */                                           \
 807                 .debug_types    0 : { *(.debug_types) }                 \
 808                 /* DWARF 5 */                                           \
 809                 .debug_addr     0 : { *(.debug_addr) }                  \
 810                 .debug_line_str 0 : { *(.debug_line_str) }              \
 811                 .debug_loclists 0 : { *(.debug_loclists) }              \
 812                 .debug_macro    0 : { *(.debug_macro) }                 \
 813                 .debug_names    0 : { *(.debug_names) }                 \
 814                 .debug_rnglists 0 : { *(.debug_rnglists) }              \
 815                 .debug_str_offsets      0 : { *(.debug_str_offsets) }
 816
 817 /* Stabs debugging sections. */
 818 #define STABS_DEBUG                                                     \
 819                 .stab 0 : { *(.stab) }                                  \
 820                 .stabstr 0 : { *(.stabstr) }                            \
 821                 .stab.excl 0 : { *(.stab.excl) }                        \
 822                 .stab.exclstr 0 : { *(.stab.exclstr) }                  \
 823                 .stab.index 0 : { *(.stab.index) }                      \
 824                 .stab.indexstr 0 : { *(.stab.indexstr) }
 825
 826 /* Required sections not related to debugging. */
 827 #define ELF_DETAILS                                                     \
 828                 .comment 0 : { *(.comment) }                            \
 829                 .symtab 0 : { *(.symtab) }                              \
 830                 .strtab 0 : { *(.strtab) }                              \
 831                 .shstrtab 0 : { *(.shstrtab) }
 832
 833 #ifdef CONFIG_GENERIC_BUG
 834 #define BUG_TABLE                                                       \
 835         . = ALIGN(8);                                                   \
 836         __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {             \
 837                 BOUNDED_SECTION_BY(__bug_table, ___bug_table)           \
 838         }
 839 #else
 840 #define BUG_TABLE
 841 #endif
 842
 843 #ifdef CONFIG_UNWINDER_ORC
 844 #define ORC_UNWIND_TABLE                                                \
 845         . = ALIGN(4);                                                   \
 846         .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) {       \
 847                 BOUNDED_SECTION_BY(.orc_unwind_ip, _orc_unwind_ip)      \
 848         }                                                               \
 849         . = ALIGN(2);                                                   \
 850         .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) {             \
 851                 BOUNDED_SECTION_BY(.orc_unwind, _orc_unwind)            \
 852         }                                                               \
 853         text_size = _etext - _stext;                                    \
 854         . = ALIGN(4);                                                   \
 855         .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) {             \
 856                 orc_lookup = .;                                         \
 857                 . += (((text_size + LOOKUP_BLOCK_SIZE - 1) /            \
 858                         LOOKUP_BLOCK_SIZE) + 1) * 4;                    \
 859                 orc_lookup_end = .;                                     \
 860         }
 861 #else
 862 #define ORC_UNWIND_TABLE
 863 #endif
 864
 865 /* Built-in firmware blobs */
 866 #ifdef CONFIG_FW_LOADER
 867 #define FW_LOADER_BUILT_IN_DATA                                         \
 868         .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) {    \
 869                 BOUNDED_SECTION_PRE_LABEL(.builtin_fw, _builtin_fw, __start, __end) \
 870         }
 871 #else
 872 #define FW_LOADER_BUILT_IN_DATA
 873 #endif
 874
 875 #ifdef CONFIG_PM_TRACE
 876 #define TRACEDATA                                                       \
 877         . = ALIGN(4);                                                   \
 878         .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {               \
 879                 BOUNDED_SECTION_POST_LABEL(.tracedata, __tracedata, _start, _end) \
 880         }
 881 #else
 882 #define TRACEDATA
 883 #endif
 884
 885 #ifdef CONFIG_PRINTK_INDEX
 886 #define PRINTK_INDEX                                                    \
 887         .printk_index : AT(ADDR(.printk_index) - LOAD_OFFSET) {         \
 888                 BOUNDED_SECTION_BY(.printk_index, _printk_index)        \
 889         }
 890 #else
 891 #define PRINTK_INDEX
 892 #endif
 893
 894 /*
 895  * Discard .note.GNU-stack, which is emitted as PROGBITS by the compiler.
 896  * Otherwise, the type of .notes section would become PROGBITS instead of NOTES.
 897  */
 898 #define NOTES                                                           \
 899         /DISCARD/ : { *(.note.GNU-stack) }                              \
 900         .notes : AT(ADDR(.notes) - LOAD_OFFSET) {                       \
 901                 BOUNDED_SECTION_BY(.note.*, _notes)                     \
 902         } NOTES_HEADERS                                                 \
 903         NOTES_HEADERS_RESTORE
 904
 905 #define INIT_SETUP(initsetup_align)                                     \
 906                 . = ALIGN(initsetup_align);                             \
 907                 BOUNDED_SECTION_POST_LABEL(.init.setup, __setup, _start, _end)
 908
 909 #define INIT_CALLS_LEVEL(level)                                         \
 910                 __initcall##level##_start = .;                          \
 911                 KEEP(*(.initcall##level##.init))                        \
 912                 KEEP(*(.initcall##level##s.init))                       \
 913
 914 #define INIT_CALLS                                                      \
 915                 __initcall_start = .;                                   \
 916                 KEEP(*(.initcallearly.init))                            \
 917                 INIT_CALLS_LEVEL(0)                                     \
 918                 INIT_CALLS_LEVEL(1)                                     \
 919                 INIT_CALLS_LEVEL(2)                                     \
 920                 INIT_CALLS_LEVEL(3)                                     \
 921                 INIT_CALLS_LEVEL(4)                                     \
 922                 INIT_CALLS_LEVEL(5)                                     \
 923                 INIT_CALLS_LEVEL(rootfs)                                \
 924                 INIT_CALLS_LEVEL(6)                                     \
 925                 INIT_CALLS_LEVEL(7)                                     \
 926                 __initcall_end = .;
 927
 928 #define CON_INITCALL                                                    \
 929         BOUNDED_SECTION_POST_LABEL(.con_initcall.init, __con_initcall, _start, _end)
 930
 931 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */
 932 #define KUNIT_TABLE()                                                   \
 933                 . = ALIGN(8);                                           \
 934                 BOUNDED_SECTION_POST_LABEL(.kunit_test_suites, __kunit_suites, _start, _end)
 935
 936 #ifdef CONFIG_BLK_DEV_INITRD
 937 #define INIT_RAM_FS                                                     \
 938         . = ALIGN(4);                                                   \
 939         __initramfs_start = .;                                          \
 940         KEEP(*(.init.ramfs))                                            \
 941         . = ALIGN(8);                                                   \
 942         KEEP(*(.init.ramfs.info))
 943 #else
 944 #define INIT_RAM_FS
 945 #endif
 946
 947 /*
 948  * Memory encryption operates on a page basis. Since we need to clear
 949  * the memory encryption mask for this section, it needs to be aligned
 950  * on a page boundary and be a page-size multiple in length.
 951  *
 952  * Note: We use a separate section so that only this section gets
 953  * decrypted to avoid exposing more than we wish.
 954  */
 955 #ifdef CONFIG_AMD_MEM_ENCRYPT
 956 #define PERCPU_DECRYPTED_SECTION                                        \
 957         . = ALIGN(PAGE_SIZE);                                           \
 958         *(.data..percpu..decrypted)                                     \
 959         . = ALIGN(PAGE_SIZE);
 960 #else
 961 #define PERCPU_DECRYPTED_SECTION
 962 #endif
 963
 964
 965 /*
 966  * Default discarded sections.
 967  *
 968  * Some archs want to discard exit text/data at runtime rather than
 969  * link time due to cross-section references such as alt instructions,
 970  * bug table, eh_frame, etc.  DISCARDS must be the last of output
 971  * section definitions so that such archs put those in earlier section
 972  * definitions.
 973  */
 974 #ifdef RUNTIME_DISCARD_EXIT
 975 #define EXIT_DISCARDS
 976 #else
 977 #define EXIT_DISCARDS                                                   \
 978         EXIT_TEXT                                                       \
 979         EXIT_DATA
 980 #endif
 981
 982 /*
 983  * Clang's -fprofile-arcs, -fsanitize=kernel-address, and
 984  * -fsanitize=thread produce unwanted sections (.eh_frame
 985  * and .init_array.*), but CONFIG_CONSTRUCTORS wants to
 986  * keep any .init_array.* sections.
 987  * https://bugs.llvm.org/show_bug.cgi?id=46478
 988  */
 989 #ifdef CONFIG_UNWIND_TABLES
 990 #define DISCARD_EH_FRAME
 991 #else
 992 #define DISCARD_EH_FRAME        *(.eh_frame)
 993 #endif
 994 #if defined(CONFIG_GCOV_KERNEL) || defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN)
 995 # ifdef CONFIG_CONSTRUCTORS
 996 #  define SANITIZER_DISCARDS                                            \
 997         DISCARD_EH_FRAME
 998 # else
 999 #  define SANITIZER_DISCARDS                                            \
1000         *(.init_array) *(.init_array.*)                                 \
1001         DISCARD_EH_FRAME
1002 # endif
1003 #else
1004 # define SANITIZER_DISCARDS
1005 #endif
1006
1007 #define COMMON_DISCARDS                                                 \
1008         SANITIZER_DISCARDS                                              \
1009         PATCHABLE_DISCARDS                                              \
1010         *(.discard)                                                     \
1011         *(.discard.*)                                                   \
1012         *(.modinfo)                                                     \
1013         /* ld.bfd warns about .gnu.version* even when not emitted */    \
1014         *(.gnu.version*)                                                \
1015
1016 #define DISCARDS                                                        \
1017         /DISCARD/ : {                                                   \
1018         EXIT_DISCARDS                                                   \
1019         EXIT_CALL                                                       \
1020         COMMON_DISCARDS                                                 \
1021         }
1022
1023 /**
1024  * PERCPU_INPUT - the percpu input sections
1025  * @cacheline: cacheline size
1026  *
1027  * The core percpu section names and core symbols which do not rely
1028  * directly upon load addresses.
1029  *
1030  * @cacheline is used to align subsections to avoid false cacheline
1031  * sharing between subsections for different purposes.
1032  */
1033 #define PERCPU_INPUT(cacheline)                                         \
1034         __per_cpu_start = .;                                            \
1035         *(.data..percpu..first)                                         \
1036         . = ALIGN(PAGE_SIZE);                                           \
1037         *(.data..percpu..page_aligned)                                  \
1038         . = ALIGN(cacheline);                                           \
1039         *(.data..percpu..read_mostly)                                   \
1040         . = ALIGN(cacheline);                                           \
1041         *(.data..percpu)                                                \
1042         *(.data..percpu..shared_aligned)                                \
1043         PERCPU_DECRYPTED_SECTION                                        \
1044         __per_cpu_end = .;
1045
1046 /**
1047  * PERCPU_VADDR - define output section for percpu area
1048  * @cacheline: cacheline size
1049  * @vaddr: explicit base address (optional)
1050  * @phdr: destination PHDR (optional)
1051  *
1052  * Macro which expands to output section for percpu area.
1053  *
1054  * @cacheline is used to align subsections to avoid false cacheline
1055  * sharing between subsections for different purposes.
1056  *
1057  * If @vaddr is not blank, it specifies explicit base address and all
1058  * percpu symbols will be offset from the given address.  If blank,
1059  * @vaddr always equals @laddr + LOAD_OFFSET.
1060  *
1061  * @phdr defines the output PHDR to use if not blank.  Be warned that
1062  * output PHDR is sticky.  If @phdr is specified, the next output
1063  * section in the linker script will go there too.  @phdr should have
1064  * a leading colon.
1065  *
1066  * Note that this macros defines __per_cpu_load as an absolute symbol.
1067  * If there is no need to put the percpu section at a predetermined
1068  * address, use PERCPU_SECTION.
1069  */
1070 #define PERCPU_VADDR(cacheline, vaddr, phdr)                            \
1071         __per_cpu_load = .;                                             \
1072         .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) {        \
1073                 PERCPU_INPUT(cacheline)                                 \
1074         } phdr                                                          \
1075         . = __per_cpu_load + SIZEOF(.data..percpu);
1076
1077 /**
1078  * PERCPU_SECTION - define output section for percpu area, simple version
1079  * @cacheline: cacheline size
1080  *
1081  * Align to PAGE_SIZE and outputs output section for percpu area.  This
1082  * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
1083  * __per_cpu_start will be identical.
1084  *
1085  * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
1086  * except that __per_cpu_load is defined as a relative symbol against
1087  * .data..percpu which is required for relocatable x86_32 configuration.
1088  */
1089 #define PERCPU_SECTION(cacheline)                                       \
1090         . = ALIGN(PAGE_SIZE);                                           \
1091         .data..percpu   : AT(ADDR(.data..percpu) - LOAD_OFFSET) {       \
1092                 __per_cpu_load = .;                                     \
1093                 PERCPU_INPUT(cacheline)                                 \
1094         }
1095
1096
1097 /*
1098  * Definition of the high level *_SECTION macros
1099  * They will fit only a subset of the architectures
1100  */
1101
1102
1103 /*
1104  * Writeable data.
1105  * All sections are combined in a single .data section.
1106  * The sections following CONSTRUCTORS are arranged so their
1107  * typical alignment matches.
1108  * A cacheline is typical/always less than a PAGE_SIZE so
1109  * the sections that has this restriction (or similar)
1110  * is located before the ones requiring PAGE_SIZE alignment.
1111  * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
1112  * matches the requirement of PAGE_ALIGNED_DATA.
1113  *
1114  * use 0 as page_align if page_aligned data is not used */
1115 #define RW_DATA(cacheline, pagealigned, inittask)                       \
1116         . = ALIGN(PAGE_SIZE);                                           \
1117         .data : AT(ADDR(.data) - LOAD_OFFSET) {                         \
1118                 INIT_TASK_DATA(inittask)                                \
1119                 NOSAVE_DATA                                             \
1120                 PAGE_ALIGNED_DATA(pagealigned)                          \
1121                 CACHELINE_ALIGNED_DATA(cacheline)                       \
1122                 READ_MOSTLY_DATA(cacheline)                             \
1123                 DATA_DATA                                               \
1124                 CONSTRUCTORS                                            \
1125         }                                                               \
1126         BUG_TABLE                                                       \
1127
1128 #define INIT_TEXT_SECTION(inittext_align)                               \
1129         . = ALIGN(inittext_align);                                      \
1130         .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {               \
1131                 _sinittext = .;                                         \
1132                 INIT_TEXT                                               \
1133                 _einittext = .;                                         \
1134         }
1135
1136 #define INIT_DATA_SECTION(initsetup_align)                              \
1137         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {               \
1138                 INIT_DATA                                               \
1139                 INIT_SETUP(initsetup_align)                             \
1140                 INIT_CALLS                                              \
1141                 CON_INITCALL                                            \
1142                 INIT_RAM_FS                                             \
1143         }
1144
1145 #define BSS_SECTION(sbss_align, bss_align, stop_align)                  \
1146         . = ALIGN(sbss_align);                                          \
1147         __bss_start = .;                                                \
1148         SBSS(sbss_align)                                                \
1149         BSS(bss_align)                                                  \
1150         . = ALIGN(stop_align);                                          \
1151         __bss_stop = .;