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