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  * RODATA_MAIN is not used because existing code already defines .rodata.x
  94  * sections to be brought in with rodata.
  95  */
  96 #ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
  97 #define TEXT_MAIN .text .text.[0-9a-zA-Z_]*
  98 #define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..L* .data..compoundliteral* .data.$__unnamed_* .data.$Lubsan_*
  99 #define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]*
 100 #define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]* .rodata..L*
 101 #define BSS_MAIN .bss .bss.[0-9a-zA-Z_]* .bss..compoundliteral*
 102 #define SBSS_MAIN .sbss .sbss.[0-9a-zA-Z_]*
 103 #else
 104 #define TEXT_MAIN .text
 105 #define DATA_MAIN .data
 106 #define SDATA_MAIN .sdata
 107 #define RODATA_MAIN .rodata
 108 #define BSS_MAIN .bss
 109 #define SBSS_MAIN .sbss
 110 #endif
 111
 112 /*
 113  * GCC 4.5 and later have a 32 bytes section alignment for structures.
 114  * Except GCC 4.9, that feels the need to align on 64 bytes.
 115  */
 116 #if __GNUC__ == 4 && __GNUC_MINOR__ == 9
 117 #define STRUCT_ALIGNMENT 64
 118 #else
 119 #define STRUCT_ALIGNMENT 32
 120 #endif
 121 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
 122
 123 /*
 124  * The order of the sched class addresses are important, as they are
 125  * used to determine the order of the priority of each sched class in
 126  * relation to each other.
 127  */
 128 #define SCHED_DATA                              \
 129         STRUCT_ALIGN();                         \
 130         __begin_sched_classes = .;              \
 131         *(__idle_sched_class)                   \
 132         *(__fair_sched_class)                   \
 133         *(__rt_sched_class)                     \
 134         *(__dl_sched_class)                     \
 135         *(__stop_sched_class)                   \
 136         __end_sched_classes = .;
 137
 138 /* The actual configuration determine if the init/exit sections
 139  * are handled as text/data or they can be discarded (which
 140  * often happens at runtime)
 141  */
 142 #ifdef CONFIG_HOTPLUG_CPU
 143 #define CPU_KEEP(sec)    *(.cpu##sec)
 144 #define CPU_DISCARD(sec)
 145 #else
 146 #define CPU_KEEP(sec)
 147 #define CPU_DISCARD(sec) *(.cpu##sec)
 148 #endif
 149
 150 #if defined(CONFIG_MEMORY_HOTPLUG)
 151 #define MEM_KEEP(sec)    *(.mem##sec)
 152 #define MEM_DISCARD(sec)
 153 #else
 154 #define MEM_KEEP(sec)
 155 #define MEM_DISCARD(sec) *(.mem##sec)
 156 #endif
 157
 158 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
 159 /*
 160  * The ftrace call sites are logged to a section whose name depends on the
 161  * compiler option used. A given kernel image will only use one, AKA
 162  * FTRACE_CALLSITE_SECTION. We capture all of them here to avoid header
 163  * dependencies for FTRACE_CALLSITE_SECTION's definition.
 164  *
 165  * Need to also make ftrace_stub_graph point to ftrace_stub
 166  * so that the same stub location may have different protocols
 167  * and not mess up with C verifiers.
 168  */
 169 #define MCOUNT_REC()    . = ALIGN(8);                           \
 170                         __start_mcount_loc = .;                 \
 171                         KEEP(*(__mcount_loc))                   \
 172                         KEEP(*(__patchable_function_entries))   \
 173                         __stop_mcount_loc = .;                  \
 174                         ftrace_stub_graph = ftrace_stub;
 175 #else
 176 # ifdef CONFIG_FUNCTION_TRACER
 177 #  define MCOUNT_REC()  ftrace_stub_graph = ftrace_stub;
 178 # else
 179 #  define MCOUNT_REC()
 180 # endif
 181 #endif
 182
 183 #ifdef CONFIG_TRACE_BRANCH_PROFILING
 184 #define LIKELY_PROFILE()        __start_annotated_branch_profile = .;   \
 185                                 KEEP(*(_ftrace_annotated_branch))       \
 186                                 __stop_annotated_branch_profile = .;
 187 #else
 188 #define LIKELY_PROFILE()
 189 #endif
 190
 191 #ifdef CONFIG_PROFILE_ALL_BRANCHES
 192 #define BRANCH_PROFILE()        __start_branch_profile = .;             \
 193                                 KEEP(*(_ftrace_branch))                 \
 194                                 __stop_branch_profile = .;
 195 #else
 196 #define BRANCH_PROFILE()
 197 #endif
 198
 199 #ifdef CONFIG_KPROBES
 200 #define KPROBE_BLACKLIST()      . = ALIGN(8);                                 \
 201                                 __start_kprobe_blacklist = .;                 \
 202                                 KEEP(*(_kprobe_blacklist))                    \
 203                                 __stop_kprobe_blacklist = .;
 204 #else
 205 #define KPROBE_BLACKLIST()
 206 #endif
 207
 208 #ifdef CONFIG_FUNCTION_ERROR_INJECTION
 209 #define ERROR_INJECT_WHITELIST()        STRUCT_ALIGN();                       \
 210                         __start_error_injection_whitelist = .;                \
 211                         KEEP(*(_error_injection_whitelist))                   \
 212                         __stop_error_injection_whitelist = .;
 213 #else
 214 #define ERROR_INJECT_WHITELIST()
 215 #endif
 216
 217 #ifdef CONFIG_EVENT_TRACING
 218 #define FTRACE_EVENTS() . = ALIGN(8);                                   \
 219                         __start_ftrace_events = .;                      \
 220                         KEEP(*(_ftrace_events))                         \
 221                         __stop_ftrace_events = .;                       \
 222                         __start_ftrace_eval_maps = .;                   \
 223                         KEEP(*(_ftrace_eval_map))                       \
 224                         __stop_ftrace_eval_maps = .;
 225 #else
 226 #define FTRACE_EVENTS()
 227 #endif
 228
 229 #ifdef CONFIG_TRACING
 230 #define TRACE_PRINTKS()  __start___trace_bprintk_fmt = .;      \
 231                          KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \
 232                          __stop___trace_bprintk_fmt = .;
 233 #define TRACEPOINT_STR() __start___tracepoint_str = .;  \
 234                          KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \
 235                          __stop___tracepoint_str = .;
 236 #else
 237 #define TRACE_PRINTKS()
 238 #define TRACEPOINT_STR()
 239 #endif
 240
 241 #ifdef CONFIG_FTRACE_SYSCALLS
 242 #define TRACE_SYSCALLS() . = ALIGN(8);                                  \
 243                          __start_syscalls_metadata = .;                 \
 244                          KEEP(*(__syscalls_metadata))                   \
 245                          __stop_syscalls_metadata = .;
 246 #else
 247 #define TRACE_SYSCALLS()
 248 #endif
 249
 250 #ifdef CONFIG_BPF_EVENTS
 251 #define BPF_RAW_TP() STRUCT_ALIGN();                                    \
 252                          __start__bpf_raw_tp = .;                       \
 253                          KEEP(*(__bpf_raw_tp_map))                      \
 254                          __stop__bpf_raw_tp = .;
 255 #else
 256 #define BPF_RAW_TP()
 257 #endif
 258
 259 #ifdef CONFIG_SERIAL_EARLYCON
 260 #define EARLYCON_TABLE() . = ALIGN(8);                          \
 261                          __earlycon_table = .;                  \
 262                          KEEP(*(__earlycon_table))              \
 263                          __earlycon_table_end = .;
 264 #else
 265 #define EARLYCON_TABLE()
 266 #endif
 267
 268 #ifdef CONFIG_SECURITY
 269 #define LSM_TABLE()     . = ALIGN(8);                                   \
 270                         __start_lsm_info = .;                           \
 271                         KEEP(*(.lsm_info.init))                         \
 272                         __end_lsm_info = .;
 273 #define EARLY_LSM_TABLE()       . = ALIGN(8);                           \
 274                         __start_early_lsm_info = .;                     \
 275                         KEEP(*(.early_lsm_info.init))                   \
 276                         __end_early_lsm_info = .;
 277 #else
 278 #define LSM_TABLE()
 279 #define EARLY_LSM_TABLE()
 280 #endif
 281
 282 #define ___OF_TABLE(cfg, name)  _OF_TABLE_##cfg(name)
 283 #define __OF_TABLE(cfg, name)   ___OF_TABLE(cfg, name)
 284 #define OF_TABLE(cfg, name)     __OF_TABLE(IS_ENABLED(cfg), name)
 285 #define _OF_TABLE_0(name)
 286 #define _OF_TABLE_1(name)                                               \
 287         . = ALIGN(8);                                                   \
 288         __##name##_of_table = .;                                        \
 289         KEEP(*(__##name##_of_table))                                    \
 290         KEEP(*(__##name##_of_table_end))
 291
 292 #define TIMER_OF_TABLES()       OF_TABLE(CONFIG_TIMER_OF, timer)
 293 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
 294 #define CLK_OF_TABLES()         OF_TABLE(CONFIG_COMMON_CLK, clk)
 295 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
 296 #define CPU_METHOD_OF_TABLES()  OF_TABLE(CONFIG_SMP, cpu_method)
 297 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method)
 298
 299 #ifdef CONFIG_ACPI
 300 #define ACPI_PROBE_TABLE(name)                                          \
 301         . = ALIGN(8);                                                   \
 302         __##name##_acpi_probe_table = .;                                \
 303         KEEP(*(__##name##_acpi_probe_table))                            \
 304         __##name##_acpi_probe_table_end = .;
 305 #else
 306 #define ACPI_PROBE_TABLE(name)
 307 #endif
 308
 309 #ifdef CONFIG_THERMAL
 310 #define THERMAL_TABLE(name)                                             \
 311         . = ALIGN(8);                                                   \
 312         __##name##_thermal_table = .;                                   \
 313         KEEP(*(__##name##_thermal_table))                               \
 314         __##name##_thermal_table_end = .;
 315 #else
 316 #define THERMAL_TABLE(name)
 317 #endif
 318
 319 #ifdef CONFIG_DTPM
 320 #define DTPM_TABLE()                                                    \
 321         . = ALIGN(8);                                                   \
 322         __dtpm_table = .;                                               \
 323         KEEP(*(__dtpm_table))                                           \
 324         __dtpm_table_end = .;
 325 #else
 326 #define DTPM_TABLE()
 327 #endif
 328
 329 #define KERNEL_DTB()                                                    \
 330         STRUCT_ALIGN();                                                 \
 331         __dtb_start = .;                                                \
 332         KEEP(*(.dtb.init.rodata))                                       \
 333         __dtb_end = .;
 334
 335 /*
 336  * .data section
 337  */
 338 #define DATA_DATA                                                       \
 339         *(.xiptext)                                                     \
 340         *(DATA_MAIN)                                                    \
 341         *(.ref.data)                                                    \
 342         *(.data..shared_aligned) /* percpu related */                   \
 343         MEM_KEEP(init.data*)                                            \
 344         MEM_KEEP(exit.data*)                                            \
 345         *(.data.unlikely)                                               \
 346         __start_once = .;                                               \
 347         *(.data.once)                                                   \
 348         __end_once = .;                                                 \
 349         STRUCT_ALIGN();                                                 \
 350         *(__tracepoints)                                                \
 351         /* implement dynamic printk debug */                            \
 352         . = ALIGN(8);                                                   \
 353         __start___dyndbg = .;                                           \
 354         KEEP(*(__dyndbg))                                               \
 355         __stop___dyndbg = .;                                            \
 356         LIKELY_PROFILE()                                                \
 357         BRANCH_PROFILE()                                                \
 358         TRACE_PRINTKS()                                                 \
 359         BPF_RAW_TP()                                                    \
 360         TRACEPOINT_STR()
 361
 362 /*
 363  * Data section helpers
 364  */
 365 #define NOSAVE_DATA                                                     \
 366         . = ALIGN(PAGE_SIZE);                                           \
 367         __nosave_begin = .;                                             \
 368         *(.data..nosave)                                                \
 369         . = ALIGN(PAGE_SIZE);                                           \
 370         __nosave_end = .;
 371
 372 #define PAGE_ALIGNED_DATA(page_align)                                   \
 373         . = ALIGN(page_align);                                          \
 374         *(.data..page_aligned)                                          \
 375         . = ALIGN(page_align);
 376
 377 #define READ_MOSTLY_DATA(align)                                         \
 378         . = ALIGN(align);                                               \
 379         *(.data..read_mostly)                                           \
 380         . = ALIGN(align);
 381
 382 #define CACHELINE_ALIGNED_DATA(align)                                   \
 383         . = ALIGN(align);                                               \
 384         *(.data..cacheline_aligned)
 385
 386 #define INIT_TASK_DATA(align)                                           \
 387         . = ALIGN(align);                                               \
 388         __start_init_task = .;                                          \
 389         init_thread_union = .;                                          \
 390         init_stack = .;                                                 \
 391         KEEP(*(.data..init_task))                                       \
 392         KEEP(*(.data..init_thread_info))                                \
 393         . = __start_init_task + THREAD_SIZE;                            \
 394         __end_init_task = .;
 395
 396 #define JUMP_TABLE_DATA                                                 \
 397         . = ALIGN(8);                                                   \
 398         __start___jump_table = .;                                       \
 399         KEEP(*(__jump_table))                                           \
 400         __stop___jump_table = .;
 401
 402 #define STATIC_CALL_DATA                                                \
 403         . = ALIGN(8);                                                   \
 404         __start_static_call_sites = .;                                  \
 405         KEEP(*(.static_call_sites))                                     \
 406         __stop_static_call_sites = .;                                   \
 407         __start_static_call_tramp_key = .;                              \
 408         KEEP(*(.static_call_tramp_key))                                 \
 409         __stop_static_call_tramp_key = .;
 410
 411 /*
 412  * Allow architectures to handle ro_after_init data on their
 413  * own by defining an empty RO_AFTER_INIT_DATA.
 414  */
 415 #ifndef RO_AFTER_INIT_DATA
 416 #define RO_AFTER_INIT_DATA                                              \
 417         . = ALIGN(8);                                                   \
 418         __start_ro_after_init = .;                                      \
 419         *(.data..ro_after_init)                                         \
 420         JUMP_TABLE_DATA                                                 \
 421         STATIC_CALL_DATA                                                \
 422         __end_ro_after_init = .;
 423 #endif
 424
 425 /*
 426  * Read only Data
 427  */
 428 #define RO_DATA(align)                                                  \
 429         . = ALIGN((align));                                             \
 430         .rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {           \
 431                 __start_rodata = .;                                     \
 432                 *(.rodata) *(.rodata.*)                                 \
 433                 SCHED_DATA                                              \
 434                 RO_AFTER_INIT_DATA      /* Read only after init */      \
 435                 . = ALIGN(8);                                           \
 436                 __start___tracepoints_ptrs = .;                         \
 437                 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \
 438                 __stop___tracepoints_ptrs = .;                          \
 439                 *(__tracepoints_strings)/* Tracepoints: strings */      \
 440         }                                                               \
 441                                                                         \
 442         .rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {          \
 443                 *(.rodata1)                                             \
 444         }                                                               \
 445                                                                         \
 446         /* PCI quirks */                                                \
 447         .pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {        \
 448                 __start_pci_fixups_early = .;                           \
 449                 KEEP(*(.pci_fixup_early))                               \
 450                 __end_pci_fixups_early = .;                             \
 451                 __start_pci_fixups_header = .;                          \
 452                 KEEP(*(.pci_fixup_header))                              \
 453                 __end_pci_fixups_header = .;                            \
 454                 __start_pci_fixups_final = .;                           \
 455                 KEEP(*(.pci_fixup_final))                               \
 456                 __end_pci_fixups_final = .;                             \
 457                 __start_pci_fixups_enable = .;                          \
 458                 KEEP(*(.pci_fixup_enable))                              \
 459                 __end_pci_fixups_enable = .;                            \
 460                 __start_pci_fixups_resume = .;                          \
 461                 KEEP(*(.pci_fixup_resume))                              \
 462                 __end_pci_fixups_resume = .;                            \
 463                 __start_pci_fixups_resume_early = .;                    \
 464                 KEEP(*(.pci_fixup_resume_early))                        \
 465                 __end_pci_fixups_resume_early = .;                      \
 466                 __start_pci_fixups_suspend = .;                         \
 467                 KEEP(*(.pci_fixup_suspend))                             \
 468                 __end_pci_fixups_suspend = .;                           \
 469                 __start_pci_fixups_suspend_late = .;                    \
 470                 KEEP(*(.pci_fixup_suspend_late))                        \
 471                 __end_pci_fixups_suspend_late = .;                      \
 472         }                                                               \
 473                                                                         \
 474         /* Built-in firmware blobs */                                   \
 475         .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) {    \
 476                 __start_builtin_fw = .;                                 \
 477                 KEEP(*(.builtin_fw))                                    \
 478                 __end_builtin_fw = .;                                   \
 479         }                                                               \
 480                                                                         \
 481         TRACEDATA                                                       \
 482                                                                         \
 483         /* Kernel symbol table: Normal symbols */                       \
 484         __ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {         \
 485                 __start___ksymtab = .;                                  \
 486                 KEEP(*(SORT(___ksymtab+*)))                             \
 487                 __stop___ksymtab = .;                                   \
 488         }                                                               \
 489                                                                         \
 490         /* Kernel symbol table: GPL-only symbols */                     \
 491         __ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {     \
 492                 __start___ksymtab_gpl = .;                              \
 493                 KEEP(*(SORT(___ksymtab_gpl+*)))                         \
 494                 __stop___ksymtab_gpl = .;                               \
 495         }                                                               \
 496                                                                         \
 497         /* Kernel symbol table: Normal unused symbols */                \
 498         __ksymtab_unused  : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) {  \
 499                 __start___ksymtab_unused = .;                           \
 500                 KEEP(*(SORT(___ksymtab_unused+*)))                      \
 501                 __stop___ksymtab_unused = .;                            \
 502         }                                                               \
 503                                                                         \
 504         /* Kernel symbol table: GPL-only unused symbols */              \
 505         __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
 506                 __start___ksymtab_unused_gpl = .;                       \
 507                 KEEP(*(SORT(___ksymtab_unused_gpl+*)))                  \
 508                 __stop___ksymtab_unused_gpl = .;                        \
 509         }                                                               \
 510                                                                         \
 511         /* Kernel symbol table: GPL-future-only symbols */              \
 512         __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
 513                 __start___ksymtab_gpl_future = .;                       \
 514                 KEEP(*(SORT(___ksymtab_gpl_future+*)))                  \
 515                 __stop___ksymtab_gpl_future = .;                        \
 516         }                                                               \
 517                                                                         \
 518         /* Kernel symbol table: Normal symbols */                       \
 519         __kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {         \
 520                 __start___kcrctab = .;                                  \
 521                 KEEP(*(SORT(___kcrctab+*)))                             \
 522                 __stop___kcrctab = .;                                   \
 523         }                                                               \
 524                                                                         \
 525         /* Kernel symbol table: GPL-only symbols */                     \
 526         __kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {     \
 527                 __start___kcrctab_gpl = .;                              \
 528                 KEEP(*(SORT(___kcrctab_gpl+*)))                         \
 529                 __stop___kcrctab_gpl = .;                               \
 530         }                                                               \
 531                                                                         \
 532         /* Kernel symbol table: Normal unused symbols */                \
 533         __kcrctab_unused  : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) {  \
 534                 __start___kcrctab_unused = .;                           \
 535                 KEEP(*(SORT(___kcrctab_unused+*)))                      \
 536                 __stop___kcrctab_unused = .;                            \
 537         }                                                               \
 538                                                                         \
 539         /* Kernel symbol table: GPL-only unused symbols */              \
 540         __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
 541                 __start___kcrctab_unused_gpl = .;                       \
 542                 KEEP(*(SORT(___kcrctab_unused_gpl+*)))                  \
 543                 __stop___kcrctab_unused_gpl = .;                        \
 544         }                                                               \
 545                                                                         \
 546         /* Kernel symbol table: GPL-future-only symbols */              \
 547         __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
 548                 __start___kcrctab_gpl_future = .;                       \
 549                 KEEP(*(SORT(___kcrctab_gpl_future+*)))                  \
 550                 __stop___kcrctab_gpl_future = .;                        \
 551         }                                                               \
 552                                                                         \
 553         /* Kernel symbol table: strings */                              \
 554         __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
 555                 *(__ksymtab_strings)                                    \
 556         }                                                               \
 557                                                                         \
 558         /* __*init sections */                                          \
 559         __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {         \
 560                 *(.ref.rodata)                                          \
 561                 MEM_KEEP(init.rodata)                                   \
 562                 MEM_KEEP(exit.rodata)                                   \
 563         }                                                               \
 564                                                                         \
 565         /* Built-in module parameters. */                               \
 566         __param : AT(ADDR(__param) - LOAD_OFFSET) {                     \
 567                 __start___param = .;                                    \
 568                 KEEP(*(__param))                                        \
 569                 __stop___param = .;                                     \
 570         }                                                               \
 571                                                                         \
 572         /* Built-in module versions. */                                 \
 573         __modver : AT(ADDR(__modver) - LOAD_OFFSET) {                   \
 574                 __start___modver = .;                                   \
 575                 KEEP(*(__modver))                                       \
 576                 __stop___modver = .;                                    \
 577         }                                                               \
 578                                                                         \
 579         RO_EXCEPTION_TABLE                                              \
 580         NOTES                                                           \
 581         BTF                                                             \
 582                                                                         \
 583         . = ALIGN((align));                                             \
 584         __end_rodata = .;
 585
 586 /*
 587  * Non-instrumentable text section
 588  */
 589 #define NOINSTR_TEXT                                                    \
 590                 ALIGN_FUNCTION();                                       \
 591                 __noinstr_text_start = .;                               \
 592                 *(.noinstr.text)                                        \
 593                 __noinstr_text_end = .;
 594
 595 /*
 596  * .text section. Map to function alignment to avoid address changes
 597  * during second ld run in second ld pass when generating System.map
 598  *
 599  * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead
 600  * code elimination is enabled, so these sections should be converted
 601  * to use ".." first.
 602  */
 603 #define TEXT_TEXT                                                       \
 604                 ALIGN_FUNCTION();                                       \
 605                 *(.text.hot .text.hot.*)                                \
 606                 *(TEXT_MAIN .text.fixup)                                \
 607                 *(.text.unlikely .text.unlikely.*)                      \
 608                 *(.text.unknown .text.unknown.*)                        \
 609                 NOINSTR_TEXT                                            \
 610                 *(.text..refcount)                                      \
 611                 *(.ref.text)                                            \
 612         MEM_KEEP(init.text*)                                            \
 613         MEM_KEEP(exit.text*)                                            \
 614
 615
 616 /* sched.text is aling to function alignment to secure we have same
 617  * address even at second ld pass when generating System.map */
 618 #define SCHED_TEXT                                                      \
 619                 ALIGN_FUNCTION();                                       \
 620                 __sched_text_start = .;                                 \
 621                 *(.sched.text)                                          \
 622                 __sched_text_end = .;
 623
 624 /* spinlock.text is aling to function alignment to secure we have same
 625  * address even at second ld pass when generating System.map */
 626 #define LOCK_TEXT                                                       \
 627                 ALIGN_FUNCTION();                                       \
 628                 __lock_text_start = .;                                  \
 629                 *(.spinlock.text)                                       \
 630                 __lock_text_end = .;
 631
 632 #define CPUIDLE_TEXT                                                    \
 633                 ALIGN_FUNCTION();                                       \
 634                 __cpuidle_text_start = .;                               \
 635                 *(.cpuidle.text)                                        \
 636                 __cpuidle_text_end = .;
 637
 638 #define KPROBES_TEXT                                                    \
 639                 ALIGN_FUNCTION();                                       \
 640                 __kprobes_text_start = .;                               \
 641                 *(.kprobes.text)                                        \
 642                 __kprobes_text_end = .;
 643
 644 #define ENTRY_TEXT                                                      \
 645                 ALIGN_FUNCTION();                                       \
 646                 __entry_text_start = .;                                 \
 647                 *(.entry.text)                                          \
 648                 __entry_text_end = .;
 649
 650 #define IRQENTRY_TEXT                                                   \
 651                 ALIGN_FUNCTION();                                       \
 652                 __irqentry_text_start = .;                              \
 653                 *(.irqentry.text)                                       \
 654                 __irqentry_text_end = .;
 655
 656 #define SOFTIRQENTRY_TEXT                                               \
 657                 ALIGN_FUNCTION();                                       \
 658                 __softirqentry_text_start = .;                          \
 659                 *(.softirqentry.text)                                   \
 660                 __softirqentry_text_end = .;
 661
 662 #define STATIC_CALL_TEXT                                                \
 663                 ALIGN_FUNCTION();                                       \
 664                 __static_call_text_start = .;                           \
 665                 *(.static_call.text)                                    \
 666                 __static_call_text_end = .;
 667
 668 /* Section used for early init (in .S files) */
 669 #define HEAD_TEXT  KEEP(*(.head.text))
 670
 671 #define HEAD_TEXT_SECTION                                                       \
 672         .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {               \
 673                 HEAD_TEXT                                               \
 674         }
 675
 676 /*
 677  * Exception table
 678  */
 679 #define EXCEPTION_TABLE(align)                                          \
 680         . = ALIGN(align);                                               \
 681         __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {               \
 682                 __start___ex_table = .;                                 \
 683                 KEEP(*(__ex_table))                                     \
 684                 __stop___ex_table = .;                                  \
 685         }
 686
 687 /*
 688  * .BTF
 689  */
 690 #ifdef CONFIG_DEBUG_INFO_BTF
 691 #define BTF                                                             \
 692         .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) {                           \
 693                 __start_BTF = .;                                        \
 694                 KEEP(*(.BTF))                                           \
 695                 __stop_BTF = .;                                         \
 696         }                                                               \
 697         . = ALIGN(4);                                                   \
 698         .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) {                   \
 699                 *(.BTF_ids)                                             \
 700         }
 701 #else
 702 #define BTF
 703 #endif
 704
 705 /*
 706  * Init task
 707  */
 708 #define INIT_TASK_DATA_SECTION(align)                                   \
 709         . = ALIGN(align);                                               \
 710         .data..init_task :  AT(ADDR(.data..init_task) - LOAD_OFFSET) {  \
 711                 INIT_TASK_DATA(align)                                   \
 712         }
 713
 714 #ifdef CONFIG_CONSTRUCTORS
 715 #define KERNEL_CTORS()  . = ALIGN(8);                      \
 716                         __ctors_start = .;                 \
 717                         KEEP(*(SORT(.ctors.*)))            \
 718                         KEEP(*(.ctors))                    \
 719                         KEEP(*(SORT(.init_array.*)))       \
 720                         KEEP(*(.init_array))               \
 721                         __ctors_end = .;
 722 #else
 723 #define KERNEL_CTORS()
 724 #endif
 725
 726 /* init and exit section handling */
 727 #define INIT_DATA                                                       \
 728         KEEP(*(SORT(___kentry+*)))                                      \
 729         *(.init.data init.data.*)                                       \
 730         MEM_DISCARD(init.data*)                                         \
 731         KERNEL_CTORS()                                                  \
 732         MCOUNT_REC()                                                    \
 733         *(.init.rodata .init.rodata.*)                                  \
 734         FTRACE_EVENTS()                                                 \
 735         TRACE_SYSCALLS()                                                \
 736         KPROBE_BLACKLIST()                                              \
 737         ERROR_INJECT_WHITELIST()                                        \
 738         MEM_DISCARD(init.rodata)                                        \
 739         CLK_OF_TABLES()                                                 \
 740         RESERVEDMEM_OF_TABLES()                                         \
 741         TIMER_OF_TABLES()                                               \
 742         CPU_METHOD_OF_TABLES()                                          \
 743         CPUIDLE_METHOD_OF_TABLES()                                      \
 744         KERNEL_DTB()                                                    \
 745         IRQCHIP_OF_MATCH_TABLE()                                        \
 746         ACPI_PROBE_TABLE(irqchip)                                       \
 747         ACPI_PROBE_TABLE(timer)                                         \
 748         THERMAL_TABLE(governor)                                         \
 749         DTPM_TABLE()                                                    \
 750         EARLYCON_TABLE()                                                \
 751         LSM_TABLE()                                                     \
 752         EARLY_LSM_TABLE()                                               \
 753         KUNIT_TABLE()
 754
 755 #define INIT_TEXT                                                       \
 756         *(.init.text .init.text.*)                                      \
 757         *(.text.startup)                                                \
 758         MEM_DISCARD(init.text*)
 759
 760 #define EXIT_DATA                                                       \
 761         *(.exit.data .exit.data.*)                                      \
 762         *(.fini_array .fini_array.*)                                    \
 763         *(.dtors .dtors.*)                                              \
 764         MEM_DISCARD(exit.data*)                                         \
 765         MEM_DISCARD(exit.rodata*)
 766
 767 #define EXIT_TEXT                                                       \
 768         *(.exit.text)                                                   \
 769         *(.text.exit)                                                   \
 770         MEM_DISCARD(exit.text)
 771
 772 #define EXIT_CALL                                                       \
 773         *(.exitcall.exit)
 774
 775 /*
 776  * bss (Block Started by Symbol) - uninitialized data
 777  * zeroed during startup
 778  */
 779 #define SBSS(sbss_align)                                                \
 780         . = ALIGN(sbss_align);                                          \
 781         .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {                         \
 782                 *(.dynsbss)                                             \
 783                 *(SBSS_MAIN)                                            \
 784                 *(.scommon)                                             \
 785         }
 786
 787 /*
 788  * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
 789  * sections to the front of bss.
 790  */
 791 #ifndef BSS_FIRST_SECTIONS
 792 #define BSS_FIRST_SECTIONS
 793 #endif
 794
 795 #define BSS(bss_align)                                                  \
 796         . = ALIGN(bss_align);                                           \
 797         .bss : AT(ADDR(.bss) - LOAD_OFFSET) {                           \
 798                 BSS_FIRST_SECTIONS                                      \
 799                 . = ALIGN(PAGE_SIZE);                                   \
 800                 *(.bss..page_aligned)                                   \
 801                 . = ALIGN(PAGE_SIZE);                                   \
 802                 *(.dynbss)                                              \
 803                 *(BSS_MAIN)                                             \
 804                 *(COMMON)                                               \
 805         }
 806
 807 /*
 808  * DWARF debug sections.
 809  * Symbols in the DWARF debugging sections are relative to
 810  * the beginning of the section so we begin them at 0.
 811  */
 812 #define DWARF_DEBUG                                                     \
 813                 /* DWARF 1 */                                           \
 814                 .debug          0 : { *(.debug) }                       \
 815                 .line           0 : { *(.line) }                        \
 816                 /* GNU DWARF 1 extensions */                            \
 817                 .debug_srcinfo  0 : { *(.debug_srcinfo) }               \
 818                 .debug_sfnames  0 : { *(.debug_sfnames) }               \
 819                 /* DWARF 1.1 and DWARF 2 */                             \
 820                 .debug_aranges  0 : { *(.debug_aranges) }               \
 821                 .debug_pubnames 0 : { *(.debug_pubnames) }              \
 822                 /* DWARF 2 */                                           \
 823                 .debug_info     0 : { *(.debug_info                     \
 824                                 .gnu.linkonce.wi.*) }                   \
 825                 .debug_abbrev   0 : { *(.debug_abbrev) }                \
 826                 .debug_line     0 : { *(.debug_line) }                  \
 827                 .debug_frame    0 : { *(.debug_frame) }                 \
 828                 .debug_str      0 : { *(.debug_str) }                   \
 829                 .debug_loc      0 : { *(.debug_loc) }                   \
 830                 .debug_macinfo  0 : { *(.debug_macinfo) }               \
 831                 .debug_pubtypes 0 : { *(.debug_pubtypes) }              \
 832                 /* DWARF 3 */                                           \
 833                 .debug_ranges   0 : { *(.debug_ranges) }                \
 834                 /* SGI/MIPS DWARF 2 extensions */                       \
 835                 .debug_weaknames 0 : { *(.debug_weaknames) }            \
 836                 .debug_funcnames 0 : { *(.debug_funcnames) }            \
 837                 .debug_typenames 0 : { *(.debug_typenames) }            \
 838                 .debug_varnames  0 : { *(.debug_varnames) }             \
 839                 /* GNU DWARF 2 extensions */                            \
 840                 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) }      \
 841                 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) }      \
 842                 /* DWARF 4 */                                           \
 843                 .debug_types    0 : { *(.debug_types) }                 \
 844                 /* DWARF 5 */                                           \
 845                 .debug_macro    0 : { *(.debug_macro) }                 \
 846                 .debug_addr     0 : { *(.debug_addr) }
 847
 848 /* Stabs debugging sections. */
 849 #define STABS_DEBUG                                                     \
 850                 .stab 0 : { *(.stab) }                                  \
 851                 .stabstr 0 : { *(.stabstr) }                            \
 852                 .stab.excl 0 : { *(.stab.excl) }                        \
 853                 .stab.exclstr 0 : { *(.stab.exclstr) }                  \
 854                 .stab.index 0 : { *(.stab.index) }                      \
 855                 .stab.indexstr 0 : { *(.stab.indexstr) }
 856
 857 /* Required sections not related to debugging. */
 858 #define ELF_DETAILS                                                     \
 859                 .comment 0 : { *(.comment) }                            \
 860                 .symtab 0 : { *(.symtab) }                              \
 861                 .strtab 0 : { *(.strtab) }                              \
 862                 .shstrtab 0 : { *(.shstrtab) }
 863
 864 #ifdef CONFIG_GENERIC_BUG
 865 #define BUG_TABLE                                                       \
 866         . = ALIGN(8);                                                   \
 867         __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {             \
 868                 __start___bug_table = .;                                \
 869                 KEEP(*(__bug_table))                                    \
 870                 __stop___bug_table = .;                                 \
 871         }
 872 #else
 873 #define BUG_TABLE
 874 #endif
 875
 876 #ifdef CONFIG_UNWINDER_ORC
 877 #define ORC_UNWIND_TABLE                                                \
 878         . = ALIGN(4);                                                   \
 879         .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) {       \
 880                 __start_orc_unwind_ip = .;                              \
 881                 KEEP(*(.orc_unwind_ip))                                 \
 882                 __stop_orc_unwind_ip = .;                               \
 883         }                                                               \
 884         . = ALIGN(2);                                                   \
 885         .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) {             \
 886                 __start_orc_unwind = .;                                 \
 887                 KEEP(*(.orc_unwind))                                    \
 888                 __stop_orc_unwind = .;                                  \
 889         }                                                               \
 890         . = ALIGN(4);                                                   \
 891         .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) {             \
 892                 orc_lookup = .;                                         \
 893                 . += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) /        \
 894                         LOOKUP_BLOCK_SIZE) + 1) * 4;                    \
 895                 orc_lookup_end = .;                                     \
 896         }
 897 #else
 898 #define ORC_UNWIND_TABLE
 899 #endif
 900
 901 #ifdef CONFIG_PM_TRACE
 902 #define TRACEDATA                                                       \
 903         . = ALIGN(4);                                                   \
 904         .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {               \
 905                 __tracedata_start = .;                                  \
 906                 KEEP(*(.tracedata))                                     \
 907                 __tracedata_end = .;                                    \
 908         }
 909 #else
 910 #define TRACEDATA
 911 #endif
 912
 913 #define NOTES                                                           \
 914         .notes : AT(ADDR(.notes) - LOAD_OFFSET) {                       \
 915                 __start_notes = .;                                      \
 916                 KEEP(*(.note.*))                                        \
 917                 __stop_notes = .;                                       \
 918         } NOTES_HEADERS                                                 \
 919         NOTES_HEADERS_RESTORE
 920
 921 #define INIT_SETUP(initsetup_align)                                     \
 922                 . = ALIGN(initsetup_align);                             \
 923                 __setup_start = .;                                      \
 924                 KEEP(*(.init.setup))                                    \
 925                 __setup_end = .;
 926
 927 #define INIT_CALLS_LEVEL(level)                                         \
 928                 __initcall##level##_start = .;                          \
 929                 KEEP(*(.initcall##level##.init))                        \
 930                 KEEP(*(.initcall##level##s.init))                       \
 931
 932 #define INIT_CALLS                                                      \
 933                 __initcall_start = .;                                   \
 934                 KEEP(*(.initcallearly.init))                            \
 935                 INIT_CALLS_LEVEL(0)                                     \
 936                 INIT_CALLS_LEVEL(1)                                     \
 937                 INIT_CALLS_LEVEL(2)                                     \
 938                 INIT_CALLS_LEVEL(3)                                     \
 939                 INIT_CALLS_LEVEL(4)                                     \
 940                 INIT_CALLS_LEVEL(5)                                     \
 941                 INIT_CALLS_LEVEL(rootfs)                                \
 942                 INIT_CALLS_LEVEL(6)                                     \
 943                 INIT_CALLS_LEVEL(7)                                     \
 944                 __initcall_end = .;
 945
 946 #define CON_INITCALL                                                    \
 947                 __con_initcall_start = .;                               \
 948                 KEEP(*(.con_initcall.init))                             \
 949                 __con_initcall_end = .;
 950
 951 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */
 952 #define KUNIT_TABLE()                                                   \
 953                 . = ALIGN(8);                                           \
 954                 __kunit_suites_start = .;                               \
 955                 KEEP(*(.kunit_test_suites))                             \
 956                 __kunit_suites_end = .;
 957
 958 #ifdef CONFIG_BLK_DEV_INITRD
 959 #define INIT_RAM_FS                                                     \
 960         . = ALIGN(4);                                                   \
 961         __initramfs_start = .;                                          \
 962         KEEP(*(.init.ramfs))                                            \
 963         . = ALIGN(8);                                                   \
 964         KEEP(*(.init.ramfs.info))
 965 #else
 966 #define INIT_RAM_FS
 967 #endif
 968
 969 /*
 970  * Memory encryption operates on a page basis. Since we need to clear
 971  * the memory encryption mask for this section, it needs to be aligned
 972  * on a page boundary and be a page-size multiple in length.
 973  *
 974  * Note: We use a separate section so that only this section gets
 975  * decrypted to avoid exposing more than we wish.
 976  */
 977 #ifdef CONFIG_AMD_MEM_ENCRYPT
 978 #define PERCPU_DECRYPTED_SECTION                                        \
 979         . = ALIGN(PAGE_SIZE);                                           \
 980         *(.data..percpu..decrypted)                                     \
 981         . = ALIGN(PAGE_SIZE);
 982 #else
 983 #define PERCPU_DECRYPTED_SECTION
 984 #endif
 985
 986
 987 /*
 988  * Default discarded sections.
 989  *
 990  * Some archs want to discard exit text/data at runtime rather than
 991  * link time due to cross-section references such as alt instructions,
 992  * bug table, eh_frame, etc.  DISCARDS must be the last of output
 993  * section definitions so that such archs put those in earlier section
 994  * definitions.
 995  */
 996 #ifdef RUNTIME_DISCARD_EXIT
 997 #define EXIT_DISCARDS
 998 #else
 999 #define EXIT_DISCARDS                                                   \
1000         EXIT_TEXT                                                       \
1001         EXIT_DATA
1002 #endif
1003
1004 /*
1005  * Clang's -fsanitize=kernel-address and -fsanitize=thread produce
1006  * unwanted sections (.eh_frame and .init_array.*), but
1007  * CONFIG_CONSTRUCTORS wants to keep any .init_array.* sections.
1008  * https://bugs.llvm.org/show_bug.cgi?id=46478
1009  */
1010 #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN)
1011 # ifdef CONFIG_CONSTRUCTORS
1012 #  define SANITIZER_DISCARDS                                            \
1013         *(.eh_frame)
1014 # else
1015 #  define SANITIZER_DISCARDS                                            \
1016         *(.init_array) *(.init_array.*)                                 \
1017         *(.eh_frame)
1018 # endif
1019 #else
1020 # define SANITIZER_DISCARDS
1021 #endif
1022
1023 #define COMMON_DISCARDS                                                 \
1024         SANITIZER_DISCARDS                                              \
1025         *(.discard)                                                     \
1026         *(.discard.*)                                                   \
1027         *(.modinfo)                                                     \
1028         /* ld.bfd warns about .gnu.version* even when not emitted */    \
1029         *(.gnu.version*)                                                \
1030
1031 #define DISCARDS                                                        \
1032         /DISCARD/ : {                                                   \
1033         EXIT_DISCARDS                                                   \
1034         EXIT_CALL                                                       \
1035         COMMON_DISCARDS                                                 \
1036         }
1037
1038 /**
1039  * PERCPU_INPUT - the percpu input sections
1040  * @cacheline: cacheline size
1041  *
1042  * The core percpu section names and core symbols which do not rely
1043  * directly upon load addresses.
1044  *
1045  * @cacheline is used to align subsections to avoid false cacheline
1046  * sharing between subsections for different purposes.
1047  */
1048 #define PERCPU_INPUT(cacheline)                                         \
1049         __per_cpu_start = .;                                            \
1050         *(.data..percpu..first)                                         \
1051         . = ALIGN(PAGE_SIZE);                                           \
1052         *(.data..percpu..page_aligned)                                  \
1053         . = ALIGN(cacheline);                                           \
1054         *(.data..percpu..read_mostly)                                   \
1055         . = ALIGN(cacheline);                                           \
1056         *(.data..percpu)                                                \
1057         *(.data..percpu..shared_aligned)                                \
1058         PERCPU_DECRYPTED_SECTION                                        \
1059         __per_cpu_end = .;
1060
1061 /**
1062  * PERCPU_VADDR - define output section for percpu area
1063  * @cacheline: cacheline size
1064  * @vaddr: explicit base address (optional)
1065  * @phdr: destination PHDR (optional)
1066  *
1067  * Macro which expands to output section for percpu area.
1068  *
1069  * @cacheline is used to align subsections to avoid false cacheline
1070  * sharing between subsections for different purposes.
1071  *
1072  * If @vaddr is not blank, it specifies explicit base address and all
1073  * percpu symbols will be offset from the given address.  If blank,
1074  * @vaddr always equals @laddr + LOAD_OFFSET.
1075  *
1076  * @phdr defines the output PHDR to use if not blank.  Be warned that
1077  * output PHDR is sticky.  If @phdr is specified, the next output
1078  * section in the linker script will go there too.  @phdr should have
1079  * a leading colon.
1080  *
1081  * Note that this macros defines __per_cpu_load as an absolute symbol.
1082  * If there is no need to put the percpu section at a predetermined
1083  * address, use PERCPU_SECTION.
1084  */
1085 #define PERCPU_VADDR(cacheline, vaddr, phdr)                            \
1086         __per_cpu_load = .;                                             \
1087         .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) {        \
1088                 PERCPU_INPUT(cacheline)                                 \
1089         } phdr                                                          \
1090         . = __per_cpu_load + SIZEOF(.data..percpu);
1091
1092 /**
1093  * PERCPU_SECTION - define output section for percpu area, simple version
1094  * @cacheline: cacheline size
1095  *
1096  * Align to PAGE_SIZE and outputs output section for percpu area.  This
1097  * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
1098  * __per_cpu_start will be identical.
1099  *
1100  * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
1101  * except that __per_cpu_load is defined as a relative symbol against
1102  * .data..percpu which is required for relocatable x86_32 configuration.
1103  */
1104 #define PERCPU_SECTION(cacheline)                                       \
1105         . = ALIGN(PAGE_SIZE);                                           \
1106         .data..percpu   : AT(ADDR(.data..percpu) - LOAD_OFFSET) {       \
1107                 __per_cpu_load = .;                                     \
1108                 PERCPU_INPUT(cacheline)                                 \
1109         }
1110
1111
1112 /*
1113  * Definition of the high level *_SECTION macros
1114  * They will fit only a subset of the architectures
1115  */
1116
1117
1118 /*
1119  * Writeable data.
1120  * All sections are combined in a single .data section.
1121  * The sections following CONSTRUCTORS are arranged so their
1122  * typical alignment matches.
1123  * A cacheline is typical/always less than a PAGE_SIZE so
1124  * the sections that has this restriction (or similar)
1125  * is located before the ones requiring PAGE_SIZE alignment.
1126  * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
1127  * matches the requirement of PAGE_ALIGNED_DATA.
1128  *
1129  * use 0 as page_align if page_aligned data is not used */
1130 #define RW_DATA(cacheline, pagealigned, inittask)                       \
1131         . = ALIGN(PAGE_SIZE);                                           \
1132         .data : AT(ADDR(.data) - LOAD_OFFSET) {                         \
1133                 INIT_TASK_DATA(inittask)                                \
1134                 NOSAVE_DATA                                             \
1135                 PAGE_ALIGNED_DATA(pagealigned)                          \
1136                 CACHELINE_ALIGNED_DATA(cacheline)                       \
1137                 READ_MOSTLY_DATA(cacheline)                             \
1138                 DATA_DATA                                               \
1139                 CONSTRUCTORS                                            \
1140         }                                                               \
1141         BUG_TABLE                                                       \
1142
1143 #define INIT_TEXT_SECTION(inittext_align)                               \
1144         . = ALIGN(inittext_align);                                      \
1145         .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {               \
1146                 _sinittext = .;                                         \
1147                 INIT_TEXT                                               \
1148                 _einittext = .;                                         \
1149         }
1150
1151 #define INIT_DATA_SECTION(initsetup_align)                              \
1152         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {               \
1153                 INIT_DATA                                               \
1154                 INIT_SETUP(initsetup_align)                             \
1155                 INIT_CALLS                                              \
1156                 CON_INITCALL                                            \
1157                 INIT_RAM_FS                                             \
1158         }
1159
1160 #define BSS_SECTION(sbss_align, bss_align, stop_align)                  \
1161         . = ALIGN(sbss_align);                                          \
1162         __bss_start = .;                                                \
1163         SBSS(sbss_align)                                                \
1164         BSS(bss_align)                                                  \
1165         . = ALIGN(stop_align);                                          \
1166         __bss_stop = .;