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 . to a 8 byte boundary equals to maximum function alignment. */
  85 #define ALIGN_FUNCTION()  . = ALIGN(8)
  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 #ifdef CONFIG_TRACE_BRANCH_PROFILING
 203 #define LIKELY_PROFILE()        __start_annotated_branch_profile = .;   \
 204                                 KEEP(*(_ftrace_annotated_branch))       \
 205                                 __stop_annotated_branch_profile = .;
 206 #else
 207 #define LIKELY_PROFILE()
 208 #endif
 209
 210 #ifdef CONFIG_PROFILE_ALL_BRANCHES
 211 #define BRANCH_PROFILE()        __start_branch_profile = .;             \
 212                                 KEEP(*(_ftrace_branch))                 \
 213                                 __stop_branch_profile = .;
 214 #else
 215 #define BRANCH_PROFILE()
 216 #endif
 217
 218 #ifdef CONFIG_KPROBES
 219 #define KPROBE_BLACKLIST()      . = ALIGN(8);                                 \
 220                                 __start_kprobe_blacklist = .;                 \
 221                                 KEEP(*(_kprobe_blacklist))                    \
 222                                 __stop_kprobe_blacklist = .;
 223 #else
 224 #define KPROBE_BLACKLIST()
 225 #endif
 226
 227 #ifdef CONFIG_FUNCTION_ERROR_INJECTION
 228 #define ERROR_INJECT_WHITELIST()        STRUCT_ALIGN();                       \
 229                         __start_error_injection_whitelist = .;                \
 230                         KEEP(*(_error_injection_whitelist))                   \
 231                         __stop_error_injection_whitelist = .;
 232 #else
 233 #define ERROR_INJECT_WHITELIST()
 234 #endif
 235
 236 #ifdef CONFIG_EVENT_TRACING
 237 #define FTRACE_EVENTS() . = ALIGN(8);                                   \
 238                         __start_ftrace_events = .;                      \
 239                         KEEP(*(_ftrace_events))                         \
 240                         __stop_ftrace_events = .;                       \
 241                         __start_ftrace_eval_maps = .;                   \
 242                         KEEP(*(_ftrace_eval_map))                       \
 243                         __stop_ftrace_eval_maps = .;
 244 #else
 245 #define FTRACE_EVENTS()
 246 #endif
 247
 248 #ifdef CONFIG_TRACING
 249 #define TRACE_PRINTKS()  __start___trace_bprintk_fmt = .;      \
 250                          KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \
 251                          __stop___trace_bprintk_fmt = .;
 252 #define TRACEPOINT_STR() __start___tracepoint_str = .;  \
 253                          KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \
 254                          __stop___tracepoint_str = .;
 255 #else
 256 #define TRACE_PRINTKS()
 257 #define TRACEPOINT_STR()
 258 #endif
 259
 260 #ifdef CONFIG_FTRACE_SYSCALLS
 261 #define TRACE_SYSCALLS() . = ALIGN(8);                                  \
 262                          __start_syscalls_metadata = .;                 \
 263                          KEEP(*(__syscalls_metadata))                   \
 264                          __stop_syscalls_metadata = .;
 265 #else
 266 #define TRACE_SYSCALLS()
 267 #endif
 268
 269 #ifdef CONFIG_BPF_EVENTS
 270 #define BPF_RAW_TP() STRUCT_ALIGN();                                    \
 271                          __start__bpf_raw_tp = .;                       \
 272                          KEEP(*(__bpf_raw_tp_map))                      \
 273                          __stop__bpf_raw_tp = .;
 274 #else
 275 #define BPF_RAW_TP()
 276 #endif
 277
 278 #ifdef CONFIG_SERIAL_EARLYCON
 279 #define EARLYCON_TABLE() . = ALIGN(8);                          \
 280                          __earlycon_table = .;                  \
 281                          KEEP(*(__earlycon_table))              \
 282                          __earlycon_table_end = .;
 283 #else
 284 #define EARLYCON_TABLE()
 285 #endif
 286
 287 #ifdef CONFIG_SECURITY
 288 #define LSM_TABLE()     . = ALIGN(8);                                   \
 289                         __start_lsm_info = .;                           \
 290                         KEEP(*(.lsm_info.init))                         \
 291                         __end_lsm_info = .;
 292 #define EARLY_LSM_TABLE()       . = ALIGN(8);                           \
 293                         __start_early_lsm_info = .;                     \
 294                         KEEP(*(.early_lsm_info.init))                   \
 295                         __end_early_lsm_info = .;
 296 #else
 297 #define LSM_TABLE()
 298 #define EARLY_LSM_TABLE()
 299 #endif
 300
 301 #define ___OF_TABLE(cfg, name)  _OF_TABLE_##cfg(name)
 302 #define __OF_TABLE(cfg, name)   ___OF_TABLE(cfg, name)
 303 #define OF_TABLE(cfg, name)     __OF_TABLE(IS_ENABLED(cfg), name)
 304 #define _OF_TABLE_0(name)
 305 #define _OF_TABLE_1(name)                                               \
 306         . = ALIGN(8);                                                   \
 307         __##name##_of_table = .;                                        \
 308         KEEP(*(__##name##_of_table))                                    \
 309         KEEP(*(__##name##_of_table_end))
 310
 311 #define TIMER_OF_TABLES()       OF_TABLE(CONFIG_TIMER_OF, timer)
 312 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
 313 #define CLK_OF_TABLES()         OF_TABLE(CONFIG_COMMON_CLK, clk)
 314 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
 315 #define CPU_METHOD_OF_TABLES()  OF_TABLE(CONFIG_SMP, cpu_method)
 316 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method)
 317
 318 #ifdef CONFIG_ACPI
 319 #define ACPI_PROBE_TABLE(name)                                          \
 320         . = ALIGN(8);                                                   \
 321         __##name##_acpi_probe_table = .;                                \
 322         KEEP(*(__##name##_acpi_probe_table))                            \
 323         __##name##_acpi_probe_table_end = .;
 324 #else
 325 #define ACPI_PROBE_TABLE(name)
 326 #endif
 327
 328 #ifdef CONFIG_THERMAL
 329 #define THERMAL_TABLE(name)                                             \
 330         . = ALIGN(8);                                                   \
 331         __##name##_thermal_table = .;                                   \
 332         KEEP(*(__##name##_thermal_table))                               \
 333         __##name##_thermal_table_end = .;
 334 #else
 335 #define THERMAL_TABLE(name)
 336 #endif
 337
 338 #define KERNEL_DTB()                                                    \
 339         STRUCT_ALIGN();                                                 \
 340         __dtb_start = .;                                                \
 341         KEEP(*(.dtb.init.rodata))                                       \
 342         __dtb_end = .;
 343
 344 /*
 345  * .data section
 346  */
 347 #define DATA_DATA                                                       \
 348         *(.xiptext)                                                     \
 349         *(DATA_MAIN)                                                    \
 350         *(.ref.data)                                                    \
 351         *(.data..shared_aligned) /* percpu related */                   \
 352         MEM_KEEP(init.data*)                                            \
 353         MEM_KEEP(exit.data*)                                            \
 354         *(.data.unlikely)                                               \
 355         __start_once = .;                                               \
 356         *(.data.once)                                                   \
 357         __end_once = .;                                                 \
 358         STRUCT_ALIGN();                                                 \
 359         *(__tracepoints)                                                \
 360         /* implement dynamic printk debug */                            \
 361         . = ALIGN(8);                                                   \
 362         __start___dyndbg_classes = .;                                   \
 363         KEEP(*(__dyndbg_classes))                                       \
 364         __stop___dyndbg_classes = .;                                    \
 365         __start___dyndbg = .;                                           \
 366         KEEP(*(__dyndbg))                                               \
 367         __stop___dyndbg = .;                                            \
 368         LIKELY_PROFILE()                                                \
 369         BRANCH_PROFILE()                                                \
 370         TRACE_PRINTKS()                                                 \
 371         BPF_RAW_TP()                                                    \
 372         TRACEPOINT_STR()
 373
 374 /*
 375  * Data section helpers
 376  */
 377 #define NOSAVE_DATA                                                     \
 378         . = ALIGN(PAGE_SIZE);                                           \
 379         __nosave_begin = .;                                             \
 380         *(.data..nosave)                                                \
 381         . = ALIGN(PAGE_SIZE);                                           \
 382         __nosave_end = .;
 383
 384 #define PAGE_ALIGNED_DATA(page_align)                                   \
 385         . = ALIGN(page_align);                                          \
 386         *(.data..page_aligned)                                          \
 387         . = ALIGN(page_align);
 388
 389 #define READ_MOSTLY_DATA(align)                                         \
 390         . = ALIGN(align);                                               \
 391         *(.data..read_mostly)                                           \
 392         . = ALIGN(align);
 393
 394 #define CACHELINE_ALIGNED_DATA(align)                                   \
 395         . = ALIGN(align);                                               \
 396         *(.data..cacheline_aligned)
 397
 398 #define INIT_TASK_DATA(align)                                           \
 399         . = ALIGN(align);                                               \
 400         __start_init_task = .;                                          \
 401         init_thread_union = .;                                          \
 402         init_stack = .;                                                 \
 403         KEEP(*(.data..init_task))                                       \
 404         KEEP(*(.data..init_thread_info))                                \
 405         . = __start_init_task + THREAD_SIZE;                            \
 406         __end_init_task = .;
 407
 408 #define JUMP_TABLE_DATA                                                 \
 409         . = ALIGN(8);                                                   \
 410         __start___jump_table = .;                                       \
 411         KEEP(*(__jump_table))                                           \
 412         __stop___jump_table = .;
 413
 414 #ifdef CONFIG_HAVE_STATIC_CALL_INLINE
 415 #define STATIC_CALL_DATA                                                \
 416         . = ALIGN(8);                                                   \
 417         __start_static_call_sites = .;                                  \
 418         KEEP(*(.static_call_sites))                                     \
 419         __stop_static_call_sites = .;                                   \
 420         __start_static_call_tramp_key = .;                              \
 421         KEEP(*(.static_call_tramp_key))                                 \
 422         __stop_static_call_tramp_key = .;
 423 #else
 424 #define STATIC_CALL_DATA
 425 #endif
 426
 427 /*
 428  * Allow architectures to handle ro_after_init data on their
 429  * own by defining an empty RO_AFTER_INIT_DATA.
 430  */
 431 #ifndef RO_AFTER_INIT_DATA
 432 #define RO_AFTER_INIT_DATA                                              \
 433         . = ALIGN(8);                                                   \
 434         __start_ro_after_init = .;                                      \
 435         *(.data..ro_after_init)                                         \
 436         JUMP_TABLE_DATA                                                 \
 437         STATIC_CALL_DATA                                                \
 438         __end_ro_after_init = .;
 439 #endif
 440
 441 /*
 442  * .kcfi_traps contains a list KCFI trap locations.
 443  */
 444 #ifndef KCFI_TRAPS
 445 #ifdef CONFIG_ARCH_USES_CFI_TRAPS
 446 #define KCFI_TRAPS                                                      \
 447         __kcfi_traps : AT(ADDR(__kcfi_traps) - LOAD_OFFSET) {           \
 448                 __start___kcfi_traps = .;                               \
 449                 KEEP(*(.kcfi_traps))                                    \
 450                 __stop___kcfi_traps = .;                                \
 451         }
 452 #else
 453 #define KCFI_TRAPS
 454 #endif
 455 #endif
 456
 457 /*
 458  * Read only Data
 459  */
 460 #define RO_DATA(align)                                                  \
 461         . = ALIGN((align));                                             \
 462         .rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {           \
 463                 __start_rodata = .;                                     \
 464                 *(.rodata) *(.rodata.*)                                 \
 465                 SCHED_DATA                                              \
 466                 RO_AFTER_INIT_DATA      /* Read only after init */      \
 467                 . = ALIGN(8);                                           \
 468                 __start___tracepoints_ptrs = .;                         \
 469                 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \
 470                 __stop___tracepoints_ptrs = .;                          \
 471                 *(__tracepoints_strings)/* Tracepoints: strings */      \
 472         }                                                               \
 473                                                                         \
 474         .rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {          \
 475                 *(.rodata1)                                             \
 476         }                                                               \
 477                                                                         \
 478         /* PCI quirks */                                                \
 479         .pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {        \
 480                 __start_pci_fixups_early = .;                           \
 481                 KEEP(*(.pci_fixup_early))                               \
 482                 __end_pci_fixups_early = .;                             \
 483                 __start_pci_fixups_header = .;                          \
 484                 KEEP(*(.pci_fixup_header))                              \
 485                 __end_pci_fixups_header = .;                            \
 486                 __start_pci_fixups_final = .;                           \
 487                 KEEP(*(.pci_fixup_final))                               \
 488                 __end_pci_fixups_final = .;                             \
 489                 __start_pci_fixups_enable = .;                          \
 490                 KEEP(*(.pci_fixup_enable))                              \
 491                 __end_pci_fixups_enable = .;                            \
 492                 __start_pci_fixups_resume = .;                          \
 493                 KEEP(*(.pci_fixup_resume))                              \
 494                 __end_pci_fixups_resume = .;                            \
 495                 __start_pci_fixups_resume_early = .;                    \
 496                 KEEP(*(.pci_fixup_resume_early))                        \
 497                 __end_pci_fixups_resume_early = .;                      \
 498                 __start_pci_fixups_suspend = .;                         \
 499                 KEEP(*(.pci_fixup_suspend))                             \
 500                 __end_pci_fixups_suspend = .;                           \
 501                 __start_pci_fixups_suspend_late = .;                    \
 502                 KEEP(*(.pci_fixup_suspend_late))                        \
 503                 __end_pci_fixups_suspend_late = .;                      \
 504         }                                                               \
 505                                                                         \
 506         FW_LOADER_BUILT_IN_DATA                                         \
 507         TRACEDATA                                                       \
 508                                                                         \
 509         PRINTK_INDEX                                                    \
 510                                                                         \
 511         /* Kernel symbol table: Normal symbols */                       \
 512         __ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {         \
 513                 __start___ksymtab = .;                                  \
 514                 KEEP(*(SORT(___ksymtab+*)))                             \
 515                 __stop___ksymtab = .;                                   \
 516         }                                                               \
 517                                                                         \
 518         /* Kernel symbol table: GPL-only symbols */                     \
 519         __ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {     \
 520                 __start___ksymtab_gpl = .;                              \
 521                 KEEP(*(SORT(___ksymtab_gpl+*)))                         \
 522                 __stop___ksymtab_gpl = .;                               \
 523         }                                                               \
 524                                                                         \
 525         /* Kernel symbol table: Normal symbols */                       \
 526         __kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {         \
 527                 __start___kcrctab = .;                                  \
 528                 KEEP(*(SORT(___kcrctab+*)))                             \
 529                 __stop___kcrctab = .;                                   \
 530         }                                                               \
 531                                                                         \
 532         /* Kernel symbol table: GPL-only symbols */                     \
 533         __kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {     \
 534                 __start___kcrctab_gpl = .;                              \
 535                 KEEP(*(SORT(___kcrctab_gpl+*)))                         \
 536                 __stop___kcrctab_gpl = .;                               \
 537         }                                                               \
 538                                                                         \
 539         /* Kernel symbol table: strings */                              \
 540         __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
 541                 *(__ksymtab_strings)                                    \
 542         }                                                               \
 543                                                                         \
 544         /* __*init sections */                                          \
 545         __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {         \
 546                 *(.ref.rodata)                                          \
 547                 MEM_KEEP(init.rodata)                                   \
 548                 MEM_KEEP(exit.rodata)                                   \
 549         }                                                               \
 550                                                                         \
 551         /* Built-in module parameters. */                               \
 552         __param : AT(ADDR(__param) - LOAD_OFFSET) {                     \
 553                 __start___param = .;                                    \
 554                 KEEP(*(__param))                                        \
 555                 __stop___param = .;                                     \
 556         }                                                               \
 557                                                                         \
 558         /* Built-in module versions. */                                 \
 559         __modver : AT(ADDR(__modver) - LOAD_OFFSET) {                   \
 560                 __start___modver = .;                                   \
 561                 KEEP(*(__modver))                                       \
 562                 __stop___modver = .;                                    \
 563         }                                                               \
 564                                                                         \
 565         KCFI_TRAPS                                                      \
 566                                                                         \
 567         RO_EXCEPTION_TABLE                                              \
 568         NOTES                                                           \
 569         BTF                                                             \
 570                                                                         \
 571         . = ALIGN((align));                                             \
 572         __end_rodata = .;
 573
 574
 575 /*
 576  * Non-instrumentable text section
 577  */
 578 #define NOINSTR_TEXT                                                    \
 579                 ALIGN_FUNCTION();                                       \
 580                 __noinstr_text_start = .;                               \
 581                 *(.noinstr.text)                                        \
 582                 __noinstr_text_end = .;
 583
 584 /*
 585  * .text section. Map to function alignment to avoid address changes
 586  * during second ld run in second ld pass when generating System.map
 587  *
 588  * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead
 589  * code elimination is enabled, so these sections should be converted
 590  * to use ".." first.
 591  */
 592 #define TEXT_TEXT                                                       \
 593                 ALIGN_FUNCTION();                                       \
 594                 *(.text.hot .text.hot.*)                                \
 595                 *(TEXT_MAIN .text.fixup)                                \
 596                 *(.text.unlikely .text.unlikely.*)                      \
 597                 *(.text.unknown .text.unknown.*)                        \
 598                 NOINSTR_TEXT                                            \
 599                 *(.text..refcount)                                      \
 600                 *(.ref.text)                                            \
 601                 *(.text.asan.* .text.tsan.*)                            \
 602         MEM_KEEP(init.text*)                                            \
 603         MEM_KEEP(exit.text*)                                            \
 604
 605
 606 /* sched.text is aling to function alignment to secure we have same
 607  * address even at second ld pass when generating System.map */
 608 #define SCHED_TEXT                                                      \
 609                 ALIGN_FUNCTION();                                       \
 610                 __sched_text_start = .;                                 \
 611                 *(.sched.text)                                          \
 612                 __sched_text_end = .;
 613
 614 /* spinlock.text is aling to function alignment to secure we have same
 615  * address even at second ld pass when generating System.map */
 616 #define LOCK_TEXT                                                       \
 617                 ALIGN_FUNCTION();                                       \
 618                 __lock_text_start = .;                                  \
 619                 *(.spinlock.text)                                       \
 620                 __lock_text_end = .;
 621
 622 #define CPUIDLE_TEXT                                                    \
 623                 ALIGN_FUNCTION();                                       \
 624                 __cpuidle_text_start = .;                               \
 625                 *(.cpuidle.text)                                        \
 626                 __cpuidle_text_end = .;
 627
 628 #define KPROBES_TEXT                                                    \
 629                 ALIGN_FUNCTION();                                       \
 630                 __kprobes_text_start = .;                               \
 631                 *(.kprobes.text)                                        \
 632                 __kprobes_text_end = .;
 633
 634 #define ENTRY_TEXT                                                      \
 635                 ALIGN_FUNCTION();                                       \
 636                 __entry_text_start = .;                                 \
 637                 *(.entry.text)                                          \
 638                 __entry_text_end = .;
 639
 640 #define IRQENTRY_TEXT                                                   \
 641                 ALIGN_FUNCTION();                                       \
 642                 __irqentry_text_start = .;                              \
 643                 *(.irqentry.text)                                       \
 644                 __irqentry_text_end = .;
 645
 646 #define SOFTIRQENTRY_TEXT                                               \
 647                 ALIGN_FUNCTION();                                       \
 648                 __softirqentry_text_start = .;                          \
 649                 *(.softirqentry.text)                                   \
 650                 __softirqentry_text_end = .;
 651
 652 #define STATIC_CALL_TEXT                                                \
 653                 ALIGN_FUNCTION();                                       \
 654                 __static_call_text_start = .;                           \
 655                 *(.static_call.text)                                    \
 656                 __static_call_text_end = .;
 657
 658 /* Section used for early init (in .S files) */
 659 #define HEAD_TEXT  KEEP(*(.head.text))
 660
 661 #define HEAD_TEXT_SECTION                                                       \
 662         .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {               \
 663                 HEAD_TEXT                                               \
 664         }
 665
 666 /*
 667  * Exception table
 668  */
 669 #define EXCEPTION_TABLE(align)                                          \
 670         . = ALIGN(align);                                               \
 671         __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {               \
 672                 __start___ex_table = .;                                 \
 673                 KEEP(*(__ex_table))                                     \
 674                 __stop___ex_table = .;                                  \
 675         }
 676
 677 /*
 678  * .BTF
 679  */
 680 #ifdef CONFIG_DEBUG_INFO_BTF
 681 #define BTF                                                             \
 682         .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) {                           \
 683                 __start_BTF = .;                                        \
 684                 KEEP(*(.BTF))                                           \
 685                 __stop_BTF = .;                                         \
 686         }                                                               \
 687         . = ALIGN(4);                                                   \
 688         .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) {                   \
 689                 *(.BTF_ids)                                             \
 690         }
 691 #else
 692 #define BTF
 693 #endif
 694
 695 /*
 696  * Init task
 697  */
 698 #define INIT_TASK_DATA_SECTION(align)                                   \
 699         . = ALIGN(align);                                               \
 700         .data..init_task :  AT(ADDR(.data..init_task) - LOAD_OFFSET) {  \
 701                 INIT_TASK_DATA(align)                                   \
 702         }
 703
 704 #ifdef CONFIG_CONSTRUCTORS
 705 #define KERNEL_CTORS()  . = ALIGN(8);                      \
 706                         __ctors_start = .;                 \
 707                         KEEP(*(SORT(.ctors.*)))            \
 708                         KEEP(*(.ctors))                    \
 709                         KEEP(*(SORT(.init_array.*)))       \
 710                         KEEP(*(.init_array))               \
 711                         __ctors_end = .;
 712 #else
 713 #define KERNEL_CTORS()
 714 #endif
 715
 716 /* init and exit section handling */
 717 #define INIT_DATA                                                       \
 718         KEEP(*(SORT(___kentry+*)))                                      \
 719         *(.init.data init.data.*)                                       \
 720         MEM_DISCARD(init.data*)                                         \
 721         KERNEL_CTORS()                                                  \
 722         MCOUNT_REC()                                                    \
 723         *(.init.rodata .init.rodata.*)                                  \
 724         FTRACE_EVENTS()                                                 \
 725         TRACE_SYSCALLS()                                                \
 726         KPROBE_BLACKLIST()                                              \
 727         ERROR_INJECT_WHITELIST()                                        \
 728         MEM_DISCARD(init.rodata)                                        \
 729         CLK_OF_TABLES()                                                 \
 730         RESERVEDMEM_OF_TABLES()                                         \
 731         TIMER_OF_TABLES()                                               \
 732         CPU_METHOD_OF_TABLES()                                          \
 733         CPUIDLE_METHOD_OF_TABLES()                                      \
 734         KERNEL_DTB()                                                    \
 735         IRQCHIP_OF_MATCH_TABLE()                                        \
 736         ACPI_PROBE_TABLE(irqchip)                                       \
 737         ACPI_PROBE_TABLE(timer)                                         \
 738         THERMAL_TABLE(governor)                                         \
 739         EARLYCON_TABLE()                                                \
 740         LSM_TABLE()                                                     \
 741         EARLY_LSM_TABLE()                                               \
 742         KUNIT_TABLE()
 743
 744 #define INIT_TEXT                                                       \
 745         *(.init.text .init.text.*)                                      \
 746         *(.text.startup)                                                \
 747         MEM_DISCARD(init.text*)
 748
 749 #define EXIT_DATA                                                       \
 750         *(.exit.data .exit.data.*)                                      \
 751         *(.fini_array .fini_array.*)                                    \
 752         *(.dtors .dtors.*)                                              \
 753         MEM_DISCARD(exit.data*)                                         \
 754         MEM_DISCARD(exit.rodata*)
 755
 756 #define EXIT_TEXT                                                       \
 757         *(.exit.text)                                                   \
 758         *(.text.exit)                                                   \
 759         MEM_DISCARD(exit.text)
 760
 761 #define EXIT_CALL                                                       \
 762         *(.exitcall.exit)
 763
 764 /*
 765  * bss (Block Started by Symbol) - uninitialized data
 766  * zeroed during startup
 767  */
 768 #define SBSS(sbss_align)                                                \
 769         . = ALIGN(sbss_align);                                          \
 770         .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {                         \
 771                 *(.dynsbss)                                             \
 772                 *(SBSS_MAIN)                                            \
 773                 *(.scommon)                                             \
 774         }
 775
 776 /*
 777  * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
 778  * sections to the front of bss.
 779  */
 780 #ifndef BSS_FIRST_SECTIONS
 781 #define BSS_FIRST_SECTIONS
 782 #endif
 783
 784 #define BSS(bss_align)                                                  \
 785         . = ALIGN(bss_align);                                           \
 786         .bss : AT(ADDR(.bss) - LOAD_OFFSET) {                           \
 787                 BSS_FIRST_SECTIONS                                      \
 788                 . = ALIGN(PAGE_SIZE);                                   \
 789                 *(.bss..page_aligned)                                   \
 790                 . = ALIGN(PAGE_SIZE);                                   \
 791                 *(.dynbss)                                              \
 792                 *(BSS_MAIN)                                             \
 793                 *(COMMON)                                               \
 794         }
 795
 796 /*
 797  * DWARF debug sections.
 798  * Symbols in the DWARF debugging sections are relative to
 799  * the beginning of the section so we begin them at 0.
 800  */
 801 #define DWARF_DEBUG                                                     \
 802                 /* DWARF 1 */                                           \
 803                 .debug          0 : { *(.debug) }                       \
 804                 .line           0 : { *(.line) }                        \
 805                 /* GNU DWARF 1 extensions */                            \
 806                 .debug_srcinfo  0 : { *(.debug_srcinfo) }               \
 807                 .debug_sfnames  0 : { *(.debug_sfnames) }               \
 808                 /* DWARF 1.1 and DWARF 2 */                             \
 809                 .debug_aranges  0 : { *(.debug_aranges) }               \
 810                 .debug_pubnames 0 : { *(.debug_pubnames) }              \
 811                 /* DWARF 2 */                                           \
 812                 .debug_info     0 : { *(.debug_info                     \
 813                                 .gnu.linkonce.wi.*) }                   \
 814                 .debug_abbrev   0 : { *(.debug_abbrev) }                \
 815                 .debug_line     0 : { *(.debug_line) }                  \
 816                 .debug_frame    0 : { *(.debug_frame) }                 \
 817                 .debug_str      0 : { *(.debug_str) }                   \
 818                 .debug_loc      0 : { *(.debug_loc) }                   \
 819                 .debug_macinfo  0 : { *(.debug_macinfo) }               \
 820                 .debug_pubtypes 0 : { *(.debug_pubtypes) }              \
 821                 /* DWARF 3 */                                           \
 822                 .debug_ranges   0 : { *(.debug_ranges) }                \
 823                 /* SGI/MIPS DWARF 2 extensions */                       \
 824                 .debug_weaknames 0 : { *(.debug_weaknames) }            \
 825                 .debug_funcnames 0 : { *(.debug_funcnames) }            \
 826                 .debug_typenames 0 : { *(.debug_typenames) }            \
 827                 .debug_varnames  0 : { *(.debug_varnames) }             \
 828                 /* GNU DWARF 2 extensions */                            \
 829                 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) }      \
 830                 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) }      \
 831                 /* DWARF 4 */                                           \
 832                 .debug_types    0 : { *(.debug_types) }                 \
 833                 /* DWARF 5 */                                           \
 834                 .debug_addr     0 : { *(.debug_addr) }                  \
 835                 .debug_line_str 0 : { *(.debug_line_str) }              \
 836                 .debug_loclists 0 : { *(.debug_loclists) }              \
 837                 .debug_macro    0 : { *(.debug_macro) }                 \
 838                 .debug_names    0 : { *(.debug_names) }                 \
 839                 .debug_rnglists 0 : { *(.debug_rnglists) }              \
 840                 .debug_str_offsets      0 : { *(.debug_str_offsets) }
 841
 842 /* Stabs debugging sections. */
 843 #define STABS_DEBUG                                                     \
 844                 .stab 0 : { *(.stab) }                                  \
 845                 .stabstr 0 : { *(.stabstr) }                            \
 846                 .stab.excl 0 : { *(.stab.excl) }                        \
 847                 .stab.exclstr 0 : { *(.stab.exclstr) }                  \
 848                 .stab.index 0 : { *(.stab.index) }                      \
 849                 .stab.indexstr 0 : { *(.stab.indexstr) }
 850
 851 /* Required sections not related to debugging. */
 852 #define ELF_DETAILS                                                     \
 853                 .comment 0 : { *(.comment) }                            \
 854                 .symtab 0 : { *(.symtab) }                              \
 855                 .strtab 0 : { *(.strtab) }                              \
 856                 .shstrtab 0 : { *(.shstrtab) }
 857
 858 #ifdef CONFIG_GENERIC_BUG
 859 #define BUG_TABLE                                                       \
 860         . = ALIGN(8);                                                   \
 861         __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {             \
 862                 __start___bug_table = .;                                \
 863                 KEEP(*(__bug_table))                                    \
 864                 __stop___bug_table = .;                                 \
 865         }
 866 #else
 867 #define BUG_TABLE
 868 #endif
 869
 870 #ifdef CONFIG_UNWINDER_ORC
 871 #define ORC_UNWIND_TABLE                                                \
 872         . = ALIGN(4);                                                   \
 873         .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) {       \
 874                 __start_orc_unwind_ip = .;                              \
 875                 KEEP(*(.orc_unwind_ip))                                 \
 876                 __stop_orc_unwind_ip = .;                               \
 877         }                                                               \
 878         . = ALIGN(2);                                                   \
 879         .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) {             \
 880                 __start_orc_unwind = .;                                 \
 881                 KEEP(*(.orc_unwind))                                    \
 882                 __stop_orc_unwind = .;                                  \
 883         }                                                               \
 884         text_size = _etext - _stext;                                    \
 885         . = ALIGN(4);                                                   \
 886         .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) {             \
 887                 orc_lookup = .;                                         \
 888                 . += (((text_size + LOOKUP_BLOCK_SIZE - 1) /            \
 889                         LOOKUP_BLOCK_SIZE) + 1) * 4;                    \
 890                 orc_lookup_end = .;                                     \
 891         }
 892 #else
 893 #define ORC_UNWIND_TABLE
 894 #endif
 895
 896 /* Built-in firmware blobs */
 897 #ifdef CONFIG_FW_LOADER
 898 #define FW_LOADER_BUILT_IN_DATA                                         \
 899         .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) {    \
 900                 __start_builtin_fw = .;                                 \
 901                 KEEP(*(.builtin_fw))                                    \
 902                 __end_builtin_fw = .;                                   \
 903         }
 904 #else
 905 #define FW_LOADER_BUILT_IN_DATA
 906 #endif
 907
 908 #ifdef CONFIG_PM_TRACE
 909 #define TRACEDATA                                                       \
 910         . = ALIGN(4);                                                   \
 911         .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {               \
 912                 __tracedata_start = .;                                  \
 913                 KEEP(*(.tracedata))                                     \
 914                 __tracedata_end = .;                                    \
 915         }
 916 #else
 917 #define TRACEDATA
 918 #endif
 919
 920 #ifdef CONFIG_PRINTK_INDEX
 921 #define PRINTK_INDEX                                                    \
 922         .printk_index : AT(ADDR(.printk_index) - LOAD_OFFSET) {         \
 923                 __start_printk_index = .;                               \
 924                 *(.printk_index)                                        \
 925                 __stop_printk_index = .;                                \
 926         }
 927 #else
 928 #define PRINTK_INDEX
 929 #endif
 930
 931 #define NOTES                                                           \
 932         .notes : AT(ADDR(.notes) - LOAD_OFFSET) {                       \
 933                 __start_notes = .;                                      \
 934                 KEEP(*(.note.*))                                        \
 935                 __stop_notes = .;                                       \
 936         } NOTES_HEADERS                                                 \
 937         NOTES_HEADERS_RESTORE
 938
 939 #define INIT_SETUP(initsetup_align)                                     \
 940                 . = ALIGN(initsetup_align);                             \
 941                 __setup_start = .;                                      \
 942                 KEEP(*(.init.setup))                                    \
 943                 __setup_end = .;
 944
 945 #define INIT_CALLS_LEVEL(level)                                         \
 946                 __initcall##level##_start = .;                          \
 947                 KEEP(*(.initcall##level##.init))                        \
 948                 KEEP(*(.initcall##level##s.init))                       \
 949
 950 #define INIT_CALLS                                                      \
 951                 __initcall_start = .;                                   \
 952                 KEEP(*(.initcallearly.init))                            \
 953                 INIT_CALLS_LEVEL(0)                                     \
 954                 INIT_CALLS_LEVEL(1)                                     \
 955                 INIT_CALLS_LEVEL(2)                                     \
 956                 INIT_CALLS_LEVEL(3)                                     \
 957                 INIT_CALLS_LEVEL(4)                                     \
 958                 INIT_CALLS_LEVEL(5)                                     \
 959                 INIT_CALLS_LEVEL(rootfs)                                \
 960                 INIT_CALLS_LEVEL(6)                                     \
 961                 INIT_CALLS_LEVEL(7)                                     \
 962                 __initcall_end = .;
 963
 964 #define CON_INITCALL                                                    \
 965                 __con_initcall_start = .;                               \
 966                 KEEP(*(.con_initcall.init))                             \
 967                 __con_initcall_end = .;
 968
 969 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */
 970 #define KUNIT_TABLE()                                                   \
 971                 . = ALIGN(8);                                           \
 972                 __kunit_suites_start = .;                               \
 973                 KEEP(*(.kunit_test_suites))                             \
 974                 __kunit_suites_end = .;
 975
 976 #ifdef CONFIG_BLK_DEV_INITRD
 977 #define INIT_RAM_FS                                                     \
 978         . = ALIGN(4);                                                   \
 979         __initramfs_start = .;                                          \
 980         KEEP(*(.init.ramfs))                                            \
 981         . = ALIGN(8);                                                   \
 982         KEEP(*(.init.ramfs.info))
 983 #else
 984 #define INIT_RAM_FS
 985 #endif
 986
 987 /*
 988  * Memory encryption operates on a page basis. Since we need to clear
 989  * the memory encryption mask for this section, it needs to be aligned
 990  * on a page boundary and be a page-size multiple in length.
 991  *
 992  * Note: We use a separate section so that only this section gets
 993  * decrypted to avoid exposing more than we wish.
 994  */
 995 #ifdef CONFIG_AMD_MEM_ENCRYPT
 996 #define PERCPU_DECRYPTED_SECTION                                        \
 997         . = ALIGN(PAGE_SIZE);                                           \
 998         *(.data..decrypted)                                             \
 999         *(.data..percpu..decrypted)                                     \
1000         . = ALIGN(PAGE_SIZE);
1001 #else
1002 #define PERCPU_DECRYPTED_SECTION
1003 #endif
1004
1005
1006 /*
1007  * Default discarded sections.
1008  *
1009  * Some archs want to discard exit text/data at runtime rather than
1010  * link time due to cross-section references such as alt instructions,
1011  * bug table, eh_frame, etc.  DISCARDS must be the last of output
1012  * section definitions so that such archs put those in earlier section
1013  * definitions.
1014  */
1015 #ifdef RUNTIME_DISCARD_EXIT
1016 #define EXIT_DISCARDS
1017 #else
1018 #define EXIT_DISCARDS                                                   \
1019         EXIT_TEXT                                                       \
1020         EXIT_DATA
1021 #endif
1022
1023 /*
1024  * Clang's -fprofile-arcs, -fsanitize=kernel-address, and
1025  * -fsanitize=thread produce unwanted sections (.eh_frame
1026  * and .init_array.*), but CONFIG_CONSTRUCTORS wants to
1027  * keep any .init_array.* sections.
1028  * https://bugs.llvm.org/show_bug.cgi?id=46478
1029  */
1030 #if defined(CONFIG_GCOV_KERNEL) || defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN)
1031 # ifdef CONFIG_CONSTRUCTORS
1032 #  define SANITIZER_DISCARDS                                            \
1033         *(.eh_frame)
1034 # else
1035 #  define SANITIZER_DISCARDS                                            \
1036         *(.init_array) *(.init_array.*)                                 \
1037         *(.eh_frame)
1038 # endif
1039 #else
1040 # define SANITIZER_DISCARDS
1041 #endif
1042
1043 #define COMMON_DISCARDS                                                 \
1044         SANITIZER_DISCARDS                                              \
1045         PATCHABLE_DISCARDS                                              \
1046         *(.discard)                                                     \
1047         *(.discard.*)                                                   \
1048         *(.modinfo)                                                     \
1049         /* ld.bfd warns about .gnu.version* even when not emitted */    \
1050         *(.gnu.version*)                                                \
1051
1052 #define DISCARDS                                                        \
1053         /DISCARD/ : {                                                   \
1054         EXIT_DISCARDS                                                   \
1055         EXIT_CALL                                                       \
1056         COMMON_DISCARDS                                                 \
1057         }
1058
1059 /**
1060  * PERCPU_INPUT - the percpu input sections
1061  * @cacheline: cacheline size
1062  *
1063  * The core percpu section names and core symbols which do not rely
1064  * directly upon load addresses.
1065  *
1066  * @cacheline is used to align subsections to avoid false cacheline
1067  * sharing between subsections for different purposes.
1068  */
1069 #define PERCPU_INPUT(cacheline)                                         \
1070         __per_cpu_start = .;                                            \
1071         *(.data..percpu..first)                                         \
1072         . = ALIGN(PAGE_SIZE);                                           \
1073         *(.data..percpu..page_aligned)                                  \
1074         . = ALIGN(cacheline);                                           \
1075         *(.data..percpu..read_mostly)                                   \
1076         . = ALIGN(cacheline);                                           \
1077         *(.data..percpu)                                                \
1078         *(.data..percpu..shared_aligned)                                \
1079         PERCPU_DECRYPTED_SECTION                                        \
1080         __per_cpu_end = .;
1081
1082 /**
1083  * PERCPU_VADDR - define output section for percpu area
1084  * @cacheline: cacheline size
1085  * @vaddr: explicit base address (optional)
1086  * @phdr: destination PHDR (optional)
1087  *
1088  * Macro which expands to output section for percpu area.
1089  *
1090  * @cacheline is used to align subsections to avoid false cacheline
1091  * sharing between subsections for different purposes.
1092  *
1093  * If @vaddr is not blank, it specifies explicit base address and all
1094  * percpu symbols will be offset from the given address.  If blank,
1095  * @vaddr always equals @laddr + LOAD_OFFSET.
1096  *
1097  * @phdr defines the output PHDR to use if not blank.  Be warned that
1098  * output PHDR is sticky.  If @phdr is specified, the next output
1099  * section in the linker script will go there too.  @phdr should have
1100  * a leading colon.
1101  *
1102  * Note that this macros defines __per_cpu_load as an absolute symbol.
1103  * If there is no need to put the percpu section at a predetermined
1104  * address, use PERCPU_SECTION.
1105  */
1106 #define PERCPU_VADDR(cacheline, vaddr, phdr)                            \
1107         __per_cpu_load = .;                                             \
1108         .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) {        \
1109                 PERCPU_INPUT(cacheline)                                 \
1110         } phdr                                                          \
1111         . = __per_cpu_load + SIZEOF(.data..percpu);
1112
1113 /**
1114  * PERCPU_SECTION - define output section for percpu area, simple version
1115  * @cacheline: cacheline size
1116  *
1117  * Align to PAGE_SIZE and outputs output section for percpu area.  This
1118  * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
1119  * __per_cpu_start will be identical.
1120  *
1121  * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
1122  * except that __per_cpu_load is defined as a relative symbol against
1123  * .data..percpu which is required for relocatable x86_32 configuration.
1124  */
1125 #define PERCPU_SECTION(cacheline)                                       \
1126         . = ALIGN(PAGE_SIZE);                                           \
1127         .data..percpu   : AT(ADDR(.data..percpu) - LOAD_OFFSET) {       \
1128                 __per_cpu_load = .;                                     \
1129                 PERCPU_INPUT(cacheline)                                 \
1130         }
1131
1132
1133 /*
1134  * Definition of the high level *_SECTION macros
1135  * They will fit only a subset of the architectures
1136  */
1137
1138
1139 /*
1140  * Writeable data.
1141  * All sections are combined in a single .data section.
1142  * The sections following CONSTRUCTORS are arranged so their
1143  * typical alignment matches.
1144  * A cacheline is typical/always less than a PAGE_SIZE so
1145  * the sections that has this restriction (or similar)
1146  * is located before the ones requiring PAGE_SIZE alignment.
1147  * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
1148  * matches the requirement of PAGE_ALIGNED_DATA.
1149  *
1150  * use 0 as page_align if page_aligned data is not used */
1151 #define RW_DATA(cacheline, pagealigned, inittask)                       \
1152         . = ALIGN(PAGE_SIZE);                                           \
1153         .data : AT(ADDR(.data) - LOAD_OFFSET) {                         \
1154                 INIT_TASK_DATA(inittask)                                \
1155                 NOSAVE_DATA                                             \
1156                 PAGE_ALIGNED_DATA(pagealigned)                          \
1157                 CACHELINE_ALIGNED_DATA(cacheline)                       \
1158                 READ_MOSTLY_DATA(cacheline)                             \
1159                 DATA_DATA                                               \
1160                 CONSTRUCTORS                                            \
1161         }                                                               \
1162         BUG_TABLE                                                       \
1163
1164 #define INIT_TEXT_SECTION(inittext_align)                               \
1165         . = ALIGN(inittext_align);                                      \
1166         .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {               \
1167                 _sinittext = .;                                         \
1168                 INIT_TEXT                                               \
1169                 _einittext = .;                                         \
1170         }
1171
1172 #define INIT_DATA_SECTION(initsetup_align)                              \
1173         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {               \
1174                 INIT_DATA                                               \
1175                 INIT_SETUP(initsetup_align)                             \
1176                 INIT_CALLS                                              \
1177                 CON_INITCALL                                            \
1178                 INIT_RAM_FS                                             \
1179         }
1180
1181 #define BSS_SECTION(sbss_align, bss_align, stop_align)                  \
1182         . = ALIGN(sbss_align);                                          \
1183         __bss_start = .;                                                \
1184         SBSS(sbss_align)                                                \
1185         BSS(bss_align)                                                  \
1186         . = ALIGN(stop_align);                                          \
1187         __bss_stop = .;