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 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
 166 /*
 167  * The ftrace call sites are logged to a section whose name depends on the
 168  * compiler option used. A given kernel image will only use one, AKA
 169  * FTRACE_CALLSITE_SECTION. We capture all of them here to avoid header
 170  * dependencies for FTRACE_CALLSITE_SECTION's definition.
 171  *
 172  * Need to also make ftrace_stub_graph point to ftrace_stub
 173  * so that the same stub location may have different protocols
 174  * and not mess up with C verifiers.
 175  *
 176  * ftrace_ops_list_func will be defined as arch_ftrace_ops_list_func
 177  * as some archs will have a different prototype for that function
 178  * but ftrace_ops_list_func() will have a single prototype.
 179  */
 180 #define MCOUNT_REC()    . = ALIGN(8);                           \
 181                         __start_mcount_loc = .;                 \
 182                         KEEP(*(__mcount_loc))                   \
 183                         KEEP_PATCHABLE                          \
 184                         __stop_mcount_loc = .;                  \
 185                         ftrace_stub_graph = ftrace_stub;        \
 186                         ftrace_ops_list_func = arch_ftrace_ops_list_func;
 187 #else
 188 # ifdef CONFIG_FUNCTION_TRACER
 189 #  define MCOUNT_REC()  ftrace_stub_graph = ftrace_stub;        \
 190                         ftrace_ops_list_func = arch_ftrace_ops_list_func;
 191 # else
 192 #  define MCOUNT_REC()
 193 # endif
 194 #endif
 195
 196 #ifdef CONFIG_TRACE_BRANCH_PROFILING
 197 #define LIKELY_PROFILE()        __start_annotated_branch_profile = .;   \
 198                                 KEEP(*(_ftrace_annotated_branch))       \
 199                                 __stop_annotated_branch_profile = .;
 200 #else
 201 #define LIKELY_PROFILE()
 202 #endif
 203
 204 #ifdef CONFIG_PROFILE_ALL_BRANCHES
 205 #define BRANCH_PROFILE()        __start_branch_profile = .;             \
 206                                 KEEP(*(_ftrace_branch))                 \
 207                                 __stop_branch_profile = .;
 208 #else
 209 #define BRANCH_PROFILE()
 210 #endif
 211
 212 #ifdef CONFIG_KPROBES
 213 #define KPROBE_BLACKLIST()      . = ALIGN(8);                                 \
 214                                 __start_kprobe_blacklist = .;                 \
 215                                 KEEP(*(_kprobe_blacklist))                    \
 216                                 __stop_kprobe_blacklist = .;
 217 #else
 218 #define KPROBE_BLACKLIST()
 219 #endif
 220
 221 #ifdef CONFIG_FUNCTION_ERROR_INJECTION
 222 #define ERROR_INJECT_WHITELIST()        STRUCT_ALIGN();                       \
 223                         __start_error_injection_whitelist = .;                \
 224                         KEEP(*(_error_injection_whitelist))                   \
 225                         __stop_error_injection_whitelist = .;
 226 #else
 227 #define ERROR_INJECT_WHITELIST()
 228 #endif
 229
 230 #ifdef CONFIG_EVENT_TRACING
 231 #define FTRACE_EVENTS() . = ALIGN(8);                                   \
 232                         __start_ftrace_events = .;                      \
 233                         KEEP(*(_ftrace_events))                         \
 234                         __stop_ftrace_events = .;                       \
 235                         __start_ftrace_eval_maps = .;                   \
 236                         KEEP(*(_ftrace_eval_map))                       \
 237                         __stop_ftrace_eval_maps = .;
 238 #else
 239 #define FTRACE_EVENTS()
 240 #endif
 241
 242 #ifdef CONFIG_TRACING
 243 #define TRACE_PRINTKS()  __start___trace_bprintk_fmt = .;      \
 244                          KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \
 245                          __stop___trace_bprintk_fmt = .;
 246 #define TRACEPOINT_STR() __start___tracepoint_str = .;  \
 247                          KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \
 248                          __stop___tracepoint_str = .;
 249 #else
 250 #define TRACE_PRINTKS()
 251 #define TRACEPOINT_STR()
 252 #endif
 253
 254 #ifdef CONFIG_FTRACE_SYSCALLS
 255 #define TRACE_SYSCALLS() . = ALIGN(8);                                  \
 256                          __start_syscalls_metadata = .;                 \
 257                          KEEP(*(__syscalls_metadata))                   \
 258                          __stop_syscalls_metadata = .;
 259 #else
 260 #define TRACE_SYSCALLS()
 261 #endif
 262
 263 #ifdef CONFIG_BPF_EVENTS
 264 #define BPF_RAW_TP() STRUCT_ALIGN();                                    \
 265                          __start__bpf_raw_tp = .;                       \
 266                          KEEP(*(__bpf_raw_tp_map))                      \
 267                          __stop__bpf_raw_tp = .;
 268 #else
 269 #define BPF_RAW_TP()
 270 #endif
 271
 272 #ifdef CONFIG_SERIAL_EARLYCON
 273 #define EARLYCON_TABLE() . = ALIGN(8);                          \
 274                          __earlycon_table = .;                  \
 275                          KEEP(*(__earlycon_table))              \
 276                          __earlycon_table_end = .;
 277 #else
 278 #define EARLYCON_TABLE()
 279 #endif
 280
 281 #ifdef CONFIG_SECURITY
 282 #define LSM_TABLE()     . = ALIGN(8);                                   \
 283                         __start_lsm_info = .;                           \
 284                         KEEP(*(.lsm_info.init))                         \
 285                         __end_lsm_info = .;
 286 #define EARLY_LSM_TABLE()       . = ALIGN(8);                           \
 287                         __start_early_lsm_info = .;                     \
 288                         KEEP(*(.early_lsm_info.init))                   \
 289                         __end_early_lsm_info = .;
 290 #else
 291 #define LSM_TABLE()
 292 #define EARLY_LSM_TABLE()
 293 #endif
 294
 295 #define ___OF_TABLE(cfg, name)  _OF_TABLE_##cfg(name)
 296 #define __OF_TABLE(cfg, name)   ___OF_TABLE(cfg, name)
 297 #define OF_TABLE(cfg, name)     __OF_TABLE(IS_ENABLED(cfg), name)
 298 #define _OF_TABLE_0(name)
 299 #define _OF_TABLE_1(name)                                               \
 300         . = ALIGN(8);                                                   \
 301         __##name##_of_table = .;                                        \
 302         KEEP(*(__##name##_of_table))                                    \
 303         KEEP(*(__##name##_of_table_end))
 304
 305 #define TIMER_OF_TABLES()       OF_TABLE(CONFIG_TIMER_OF, timer)
 306 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
 307 #define CLK_OF_TABLES()         OF_TABLE(CONFIG_COMMON_CLK, clk)
 308 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
 309 #define CPU_METHOD_OF_TABLES()  OF_TABLE(CONFIG_SMP, cpu_method)
 310 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method)
 311
 312 #ifdef CONFIG_ACPI
 313 #define ACPI_PROBE_TABLE(name)                                          \
 314         . = ALIGN(8);                                                   \
 315         __##name##_acpi_probe_table = .;                                \
 316         KEEP(*(__##name##_acpi_probe_table))                            \
 317         __##name##_acpi_probe_table_end = .;
 318 #else
 319 #define ACPI_PROBE_TABLE(name)
 320 #endif
 321
 322 #ifdef CONFIG_THERMAL
 323 #define THERMAL_TABLE(name)                                             \
 324         . = ALIGN(8);                                                   \
 325         __##name##_thermal_table = .;                                   \
 326         KEEP(*(__##name##_thermal_table))                               \
 327         __##name##_thermal_table_end = .;
 328 #else
 329 #define THERMAL_TABLE(name)
 330 #endif
 331
 332 #define KERNEL_DTB()                                                    \
 333         STRUCT_ALIGN();                                                 \
 334         __dtb_start = .;                                                \
 335         KEEP(*(.dtb.init.rodata))                                       \
 336         __dtb_end = .;
 337
 338 /*
 339  * .data section
 340  */
 341 #define DATA_DATA                                                       \
 342         *(.xiptext)                                                     \
 343         *(DATA_MAIN)                                                    \
 344         *(.ref.data)                                                    \
 345         *(.data..shared_aligned) /* percpu related */                   \
 346         MEM_KEEP(init.data*)                                            \
 347         MEM_KEEP(exit.data*)                                            \
 348         *(.data.unlikely)                                               \
 349         __start_once = .;                                               \
 350         *(.data.once)                                                   \
 351         __end_once = .;                                                 \
 352         STRUCT_ALIGN();                                                 \
 353         *(__tracepoints)                                                \
 354         /* implement dynamic printk debug */                            \
 355         . = ALIGN(8);                                                   \
 356         __start___dyndbg = .;                                           \
 357         KEEP(*(__dyndbg))                                               \
 358         __stop___dyndbg = .;                                            \
 359         LIKELY_PROFILE()                                                \
 360         BRANCH_PROFILE()                                                \
 361         TRACE_PRINTKS()                                                 \
 362         BPF_RAW_TP()                                                    \
 363         TRACEPOINT_STR()
 364
 365 /*
 366  * Data section helpers
 367  */
 368 #define NOSAVE_DATA                                                     \
 369         . = ALIGN(PAGE_SIZE);                                           \
 370         __nosave_begin = .;                                             \
 371         *(.data..nosave)                                                \
 372         . = ALIGN(PAGE_SIZE);                                           \
 373         __nosave_end = .;
 374
 375 #define PAGE_ALIGNED_DATA(page_align)                                   \
 376         . = ALIGN(page_align);                                          \
 377         *(.data..page_aligned)                                          \
 378         . = ALIGN(page_align);
 379
 380 #define READ_MOSTLY_DATA(align)                                         \
 381         . = ALIGN(align);                                               \
 382         *(.data..read_mostly)                                           \
 383         . = ALIGN(align);
 384
 385 #define CACHELINE_ALIGNED_DATA(align)                                   \
 386         . = ALIGN(align);                                               \
 387         *(.data..cacheline_aligned)
 388
 389 #define INIT_TASK_DATA(align)                                           \
 390         . = ALIGN(align);                                               \
 391         __start_init_task = .;                                          \
 392         init_thread_union = .;                                          \
 393         init_stack = .;                                                 \
 394         KEEP(*(.data..init_task))                                       \
 395         KEEP(*(.data..init_thread_info))                                \
 396         . = __start_init_task + THREAD_SIZE;                            \
 397         __end_init_task = .;
 398
 399 #define JUMP_TABLE_DATA                                                 \
 400         . = ALIGN(8);                                                   \
 401         __start___jump_table = .;                                       \
 402         KEEP(*(__jump_table))                                           \
 403         __stop___jump_table = .;
 404
 405 #ifdef CONFIG_HAVE_STATIC_CALL_INLINE
 406 #define STATIC_CALL_DATA                                                \
 407         . = ALIGN(8);                                                   \
 408         __start_static_call_sites = .;                                  \
 409         KEEP(*(.static_call_sites))                                     \
 410         __stop_static_call_sites = .;                                   \
 411         __start_static_call_tramp_key = .;                              \
 412         KEEP(*(.static_call_tramp_key))                                 \
 413         __stop_static_call_tramp_key = .;
 414 #else
 415 #define STATIC_CALL_DATA
 416 #endif
 417
 418 /*
 419  * Allow architectures to handle ro_after_init data on their
 420  * own by defining an empty RO_AFTER_INIT_DATA.
 421  */
 422 #ifndef RO_AFTER_INIT_DATA
 423 #define RO_AFTER_INIT_DATA                                              \
 424         . = ALIGN(8);                                                   \
 425         __start_ro_after_init = .;                                      \
 426         *(.data..ro_after_init)                                         \
 427         JUMP_TABLE_DATA                                                 \
 428         STATIC_CALL_DATA                                                \
 429         __end_ro_after_init = .;
 430 #endif
 431
 432 /*
 433  * .kcfi_traps contains a list KCFI trap locations.
 434  */
 435 #ifndef KCFI_TRAPS
 436 #ifdef CONFIG_ARCH_USES_CFI_TRAPS
 437 #define KCFI_TRAPS                                                      \
 438         __kcfi_traps : AT(ADDR(__kcfi_traps) - LOAD_OFFSET) {           \
 439                 __start___kcfi_traps = .;                               \
 440                 KEEP(*(.kcfi_traps))                                    \
 441                 __stop___kcfi_traps = .;                                \
 442         }
 443 #else
 444 #define KCFI_TRAPS
 445 #endif
 446 #endif
 447
 448 /*
 449  * Read only Data
 450  */
 451 #define RO_DATA(align)                                                  \
 452         . = ALIGN((align));                                             \
 453         .rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {           \
 454                 __start_rodata = .;                                     \
 455                 *(.rodata) *(.rodata.*)                                 \
 456                 SCHED_DATA                                              \
 457                 RO_AFTER_INIT_DATA      /* Read only after init */      \
 458                 . = ALIGN(8);                                           \
 459                 __start___tracepoints_ptrs = .;                         \
 460                 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \
 461                 __stop___tracepoints_ptrs = .;                          \
 462                 *(__tracepoints_strings)/* Tracepoints: strings */      \
 463         }                                                               \
 464                                                                         \
 465         .rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {          \
 466                 *(.rodata1)                                             \
 467         }                                                               \
 468                                                                         \
 469         /* PCI quirks */                                                \
 470         .pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {        \
 471                 __start_pci_fixups_early = .;                           \
 472                 KEEP(*(.pci_fixup_early))                               \
 473                 __end_pci_fixups_early = .;                             \
 474                 __start_pci_fixups_header = .;                          \
 475                 KEEP(*(.pci_fixup_header))                              \
 476                 __end_pci_fixups_header = .;                            \
 477                 __start_pci_fixups_final = .;                           \
 478                 KEEP(*(.pci_fixup_final))                               \
 479                 __end_pci_fixups_final = .;                             \
 480                 __start_pci_fixups_enable = .;                          \
 481                 KEEP(*(.pci_fixup_enable))                              \
 482                 __end_pci_fixups_enable = .;                            \
 483                 __start_pci_fixups_resume = .;                          \
 484                 KEEP(*(.pci_fixup_resume))                              \
 485                 __end_pci_fixups_resume = .;                            \
 486                 __start_pci_fixups_resume_early = .;                    \
 487                 KEEP(*(.pci_fixup_resume_early))                        \
 488                 __end_pci_fixups_resume_early = .;                      \
 489                 __start_pci_fixups_suspend = .;                         \
 490                 KEEP(*(.pci_fixup_suspend))                             \
 491                 __end_pci_fixups_suspend = .;                           \
 492                 __start_pci_fixups_suspend_late = .;                    \
 493                 KEEP(*(.pci_fixup_suspend_late))                        \
 494                 __end_pci_fixups_suspend_late = .;                      \
 495         }                                                               \
 496                                                                         \
 497         FW_LOADER_BUILT_IN_DATA                                         \
 498         TRACEDATA                                                       \
 499                                                                         \
 500         PRINTK_INDEX                                                    \
 501                                                                         \
 502         /* Kernel symbol table: Normal symbols */                       \
 503         __ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {         \
 504                 __start___ksymtab = .;                                  \
 505                 KEEP(*(SORT(___ksymtab+*)))                             \
 506                 __stop___ksymtab = .;                                   \
 507         }                                                               \
 508                                                                         \
 509         /* Kernel symbol table: GPL-only symbols */                     \
 510         __ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {     \
 511                 __start___ksymtab_gpl = .;                              \
 512                 KEEP(*(SORT(___ksymtab_gpl+*)))                         \
 513                 __stop___ksymtab_gpl = .;                               \
 514         }                                                               \
 515                                                                         \
 516         /* Kernel symbol table: Normal symbols */                       \
 517         __kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {         \
 518                 __start___kcrctab = .;                                  \
 519                 KEEP(*(SORT(___kcrctab+*)))                             \
 520                 __stop___kcrctab = .;                                   \
 521         }                                                               \
 522                                                                         \
 523         /* Kernel symbol table: GPL-only symbols */                     \
 524         __kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {     \
 525                 __start___kcrctab_gpl = .;                              \
 526                 KEEP(*(SORT(___kcrctab_gpl+*)))                         \
 527                 __stop___kcrctab_gpl = .;                               \
 528         }                                                               \
 529                                                                         \
 530         /* Kernel symbol table: strings */                              \
 531         __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
 532                 *(__ksymtab_strings)                                    \
 533         }                                                               \
 534                                                                         \
 535         /* __*init sections */                                          \
 536         __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {         \
 537                 *(.ref.rodata)                                          \
 538                 MEM_KEEP(init.rodata)                                   \
 539                 MEM_KEEP(exit.rodata)                                   \
 540         }                                                               \
 541                                                                         \
 542         /* Built-in module parameters. */                               \
 543         __param : AT(ADDR(__param) - LOAD_OFFSET) {                     \
 544                 __start___param = .;                                    \
 545                 KEEP(*(__param))                                        \
 546                 __stop___param = .;                                     \
 547         }                                                               \
 548                                                                         \
 549         /* Built-in module versions. */                                 \
 550         __modver : AT(ADDR(__modver) - LOAD_OFFSET) {                   \
 551                 __start___modver = .;                                   \
 552                 KEEP(*(__modver))                                       \
 553                 __stop___modver = .;                                    \
 554         }                                                               \
 555                                                                         \
 556         KCFI_TRAPS                                                      \
 557                                                                         \
 558         RO_EXCEPTION_TABLE                                              \
 559         NOTES                                                           \
 560         BTF                                                             \
 561                                                                         \
 562         . = ALIGN((align));                                             \
 563         __end_rodata = .;
 564
 565
 566 /*
 567  * Non-instrumentable text section
 568  */
 569 #define NOINSTR_TEXT                                                    \
 570                 ALIGN_FUNCTION();                                       \
 571                 __noinstr_text_start = .;                               \
 572                 *(.noinstr.text)                                        \
 573                 __noinstr_text_end = .;
 574
 575 /*
 576  * .text section. Map to function alignment to avoid address changes
 577  * during second ld run in second ld pass when generating System.map
 578  *
 579  * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead
 580  * code elimination is enabled, so these sections should be converted
 581  * to use ".." first.
 582  */
 583 #define TEXT_TEXT                                                       \
 584                 ALIGN_FUNCTION();                                       \
 585                 *(.text.hot .text.hot.*)                                \
 586                 *(TEXT_MAIN .text.fixup)                                \
 587                 *(.text.unlikely .text.unlikely.*)                      \
 588                 *(.text.unknown .text.unknown.*)                        \
 589                 NOINSTR_TEXT                                            \
 590                 *(.text..refcount)                                      \
 591                 *(.ref.text)                                            \
 592                 *(.text.asan.* .text.tsan.*)                            \
 593         MEM_KEEP(init.text*)                                            \
 594         MEM_KEEP(exit.text*)                                            \
 595
 596
 597 /* sched.text is aling to function alignment to secure we have same
 598  * address even at second ld pass when generating System.map */
 599 #define SCHED_TEXT                                                      \
 600                 ALIGN_FUNCTION();                                       \
 601                 __sched_text_start = .;                                 \
 602                 *(.sched.text)                                          \
 603                 __sched_text_end = .;
 604
 605 /* spinlock.text is aling to function alignment to secure we have same
 606  * address even at second ld pass when generating System.map */
 607 #define LOCK_TEXT                                                       \
 608                 ALIGN_FUNCTION();                                       \
 609                 __lock_text_start = .;                                  \
 610                 *(.spinlock.text)                                       \
 611                 __lock_text_end = .;
 612
 613 #define CPUIDLE_TEXT                                                    \
 614                 ALIGN_FUNCTION();                                       \
 615                 __cpuidle_text_start = .;                               \
 616                 *(.cpuidle.text)                                        \
 617                 __cpuidle_text_end = .;
 618
 619 #define KPROBES_TEXT                                                    \
 620                 ALIGN_FUNCTION();                                       \
 621                 __kprobes_text_start = .;                               \
 622                 *(.kprobes.text)                                        \
 623                 __kprobes_text_end = .;
 624
 625 #define ENTRY_TEXT                                                      \
 626                 ALIGN_FUNCTION();                                       \
 627                 __entry_text_start = .;                                 \
 628                 *(.entry.text)                                          \
 629                 __entry_text_end = .;
 630
 631 #define IRQENTRY_TEXT                                                   \
 632                 ALIGN_FUNCTION();                                       \
 633                 __irqentry_text_start = .;                              \
 634                 *(.irqentry.text)                                       \
 635                 __irqentry_text_end = .;
 636
 637 #define SOFTIRQENTRY_TEXT                                               \
 638                 ALIGN_FUNCTION();                                       \
 639                 __softirqentry_text_start = .;                          \
 640                 *(.softirqentry.text)                                   \
 641                 __softirqentry_text_end = .;
 642
 643 #define STATIC_CALL_TEXT                                                \
 644                 ALIGN_FUNCTION();                                       \
 645                 __static_call_text_start = .;                           \
 646                 *(.static_call.text)                                    \
 647                 __static_call_text_end = .;
 648
 649 /* Section used for early init (in .S files) */
 650 #define HEAD_TEXT  KEEP(*(.head.text))
 651
 652 #define HEAD_TEXT_SECTION                                                       \
 653         .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {               \
 654                 HEAD_TEXT                                               \
 655         }
 656
 657 /*
 658  * Exception table
 659  */
 660 #define EXCEPTION_TABLE(align)                                          \
 661         . = ALIGN(align);                                               \
 662         __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {               \
 663                 __start___ex_table = .;                                 \
 664                 KEEP(*(__ex_table))                                     \
 665                 __stop___ex_table = .;                                  \
 666         }
 667
 668 /*
 669  * .BTF
 670  */
 671 #ifdef CONFIG_DEBUG_INFO_BTF
 672 #define BTF                                                             \
 673         .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) {                           \
 674                 __start_BTF = .;                                        \
 675                 KEEP(*(.BTF))                                           \
 676                 __stop_BTF = .;                                         \
 677         }                                                               \
 678         . = ALIGN(4);                                                   \
 679         .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) {                   \
 680                 *(.BTF_ids)                                             \
 681         }
 682 #else
 683 #define BTF
 684 #endif
 685
 686 /*
 687  * Init task
 688  */
 689 #define INIT_TASK_DATA_SECTION(align)                                   \
 690         . = ALIGN(align);                                               \
 691         .data..init_task :  AT(ADDR(.data..init_task) - LOAD_OFFSET) {  \
 692                 INIT_TASK_DATA(align)                                   \
 693         }
 694
 695 #ifdef CONFIG_CONSTRUCTORS
 696 #define KERNEL_CTORS()  . = ALIGN(8);                      \
 697                         __ctors_start = .;                 \
 698                         KEEP(*(SORT(.ctors.*)))            \
 699                         KEEP(*(.ctors))                    \
 700                         KEEP(*(SORT(.init_array.*)))       \
 701                         KEEP(*(.init_array))               \
 702                         __ctors_end = .;
 703 #else
 704 #define KERNEL_CTORS()
 705 #endif
 706
 707 /* init and exit section handling */
 708 #define INIT_DATA                                                       \
 709         KEEP(*(SORT(___kentry+*)))                                      \
 710         *(.init.data init.data.*)                                       \
 711         MEM_DISCARD(init.data*)                                         \
 712         KERNEL_CTORS()                                                  \
 713         MCOUNT_REC()                                                    \
 714         *(.init.rodata .init.rodata.*)                                  \
 715         FTRACE_EVENTS()                                                 \
 716         TRACE_SYSCALLS()                                                \
 717         KPROBE_BLACKLIST()                                              \
 718         ERROR_INJECT_WHITELIST()                                        \
 719         MEM_DISCARD(init.rodata)                                        \
 720         CLK_OF_TABLES()                                                 \
 721         RESERVEDMEM_OF_TABLES()                                         \
 722         TIMER_OF_TABLES()                                               \
 723         CPU_METHOD_OF_TABLES()                                          \
 724         CPUIDLE_METHOD_OF_TABLES()                                      \
 725         KERNEL_DTB()                                                    \
 726         IRQCHIP_OF_MATCH_TABLE()                                        \
 727         ACPI_PROBE_TABLE(irqchip)                                       \
 728         ACPI_PROBE_TABLE(timer)                                         \
 729         THERMAL_TABLE(governor)                                         \
 730         EARLYCON_TABLE()                                                \
 731         LSM_TABLE()                                                     \
 732         EARLY_LSM_TABLE()                                               \
 733         KUNIT_TABLE()
 734
 735 #define INIT_TEXT                                                       \
 736         *(.init.text .init.text.*)                                      \
 737         *(.text.startup)                                                \
 738         MEM_DISCARD(init.text*)
 739
 740 #define EXIT_DATA                                                       \
 741         *(.exit.data .exit.data.*)                                      \
 742         *(.fini_array .fini_array.*)                                    \
 743         *(.dtors .dtors.*)                                              \
 744         MEM_DISCARD(exit.data*)                                         \
 745         MEM_DISCARD(exit.rodata*)
 746
 747 #define EXIT_TEXT                                                       \
 748         *(.exit.text)                                                   \
 749         *(.text.exit)                                                   \
 750         MEM_DISCARD(exit.text)
 751
 752 #define EXIT_CALL                                                       \
 753         *(.exitcall.exit)
 754
 755 /*
 756  * bss (Block Started by Symbol) - uninitialized data
 757  * zeroed during startup
 758  */
 759 #define SBSS(sbss_align)                                                \
 760         . = ALIGN(sbss_align);                                          \
 761         .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {                         \
 762                 *(.dynsbss)                                             \
 763                 *(SBSS_MAIN)                                            \
 764                 *(.scommon)                                             \
 765         }
 766
 767 /*
 768  * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
 769  * sections to the front of bss.
 770  */
 771 #ifndef BSS_FIRST_SECTIONS
 772 #define BSS_FIRST_SECTIONS
 773 #endif
 774
 775 #define BSS(bss_align)                                                  \
 776         . = ALIGN(bss_align);                                           \
 777         .bss : AT(ADDR(.bss) - LOAD_OFFSET) {                           \
 778                 BSS_FIRST_SECTIONS                                      \
 779                 . = ALIGN(PAGE_SIZE);                                   \
 780                 *(.bss..page_aligned)                                   \
 781                 . = ALIGN(PAGE_SIZE);                                   \
 782                 *(.dynbss)                                              \
 783                 *(BSS_MAIN)                                             \
 784                 *(COMMON)                                               \
 785         }
 786
 787 /*
 788  * DWARF debug sections.
 789  * Symbols in the DWARF debugging sections are relative to
 790  * the beginning of the section so we begin them at 0.
 791  */
 792 #define DWARF_DEBUG                                                     \
 793                 /* DWARF 1 */                                           \
 794                 .debug          0 : { *(.debug) }                       \
 795                 .line           0 : { *(.line) }                        \
 796                 /* GNU DWARF 1 extensions */                            \
 797                 .debug_srcinfo  0 : { *(.debug_srcinfo) }               \
 798                 .debug_sfnames  0 : { *(.debug_sfnames) }               \
 799                 /* DWARF 1.1 and DWARF 2 */                             \
 800                 .debug_aranges  0 : { *(.debug_aranges) }               \
 801                 .debug_pubnames 0 : { *(.debug_pubnames) }              \
 802                 /* DWARF 2 */                                           \
 803                 .debug_info     0 : { *(.debug_info                     \
 804                                 .gnu.linkonce.wi.*) }                   \
 805                 .debug_abbrev   0 : { *(.debug_abbrev) }                \
 806                 .debug_line     0 : { *(.debug_line) }                  \
 807                 .debug_frame    0 : { *(.debug_frame) }                 \
 808                 .debug_str      0 : { *(.debug_str) }                   \
 809                 .debug_loc      0 : { *(.debug_loc) }                   \
 810                 .debug_macinfo  0 : { *(.debug_macinfo) }               \
 811                 .debug_pubtypes 0 : { *(.debug_pubtypes) }              \
 812                 /* DWARF 3 */                                           \
 813                 .debug_ranges   0 : { *(.debug_ranges) }                \
 814                 /* SGI/MIPS DWARF 2 extensions */                       \
 815                 .debug_weaknames 0 : { *(.debug_weaknames) }            \
 816                 .debug_funcnames 0 : { *(.debug_funcnames) }            \
 817                 .debug_typenames 0 : { *(.debug_typenames) }            \
 818                 .debug_varnames  0 : { *(.debug_varnames) }             \
 819                 /* GNU DWARF 2 extensions */                            \
 820                 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) }      \
 821                 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) }      \
 822                 /* DWARF 4 */                                           \
 823                 .debug_types    0 : { *(.debug_types) }                 \
 824                 /* DWARF 5 */                                           \
 825                 .debug_addr     0 : { *(.debug_addr) }                  \
 826                 .debug_line_str 0 : { *(.debug_line_str) }              \
 827                 .debug_loclists 0 : { *(.debug_loclists) }              \
 828                 .debug_macro    0 : { *(.debug_macro) }                 \
 829                 .debug_names    0 : { *(.debug_names) }                 \
 830                 .debug_rnglists 0 : { *(.debug_rnglists) }              \
 831                 .debug_str_offsets      0 : { *(.debug_str_offsets) }
 832
 833 /* Stabs debugging sections. */
 834 #define STABS_DEBUG                                                     \
 835                 .stab 0 : { *(.stab) }                                  \
 836                 .stabstr 0 : { *(.stabstr) }                            \
 837                 .stab.excl 0 : { *(.stab.excl) }                        \
 838                 .stab.exclstr 0 : { *(.stab.exclstr) }                  \
 839                 .stab.index 0 : { *(.stab.index) }                      \
 840                 .stab.indexstr 0 : { *(.stab.indexstr) }
 841
 842 /* Required sections not related to debugging. */
 843 #define ELF_DETAILS                                                     \
 844                 .comment 0 : { *(.comment) }                            \
 845                 .symtab 0 : { *(.symtab) }                              \
 846                 .strtab 0 : { *(.strtab) }                              \
 847                 .shstrtab 0 : { *(.shstrtab) }
 848
 849 #ifdef CONFIG_GENERIC_BUG
 850 #define BUG_TABLE                                                       \
 851         . = ALIGN(8);                                                   \
 852         __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {             \
 853                 __start___bug_table = .;                                \
 854                 KEEP(*(__bug_table))                                    \
 855                 __stop___bug_table = .;                                 \
 856         }
 857 #else
 858 #define BUG_TABLE
 859 #endif
 860
 861 #ifdef CONFIG_UNWINDER_ORC
 862 #define ORC_UNWIND_TABLE                                                \
 863         . = ALIGN(4);                                                   \
 864         .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) {       \
 865                 __start_orc_unwind_ip = .;                              \
 866                 KEEP(*(.orc_unwind_ip))                                 \
 867                 __stop_orc_unwind_ip = .;                               \
 868         }                                                               \
 869         . = ALIGN(2);                                                   \
 870         .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) {             \
 871                 __start_orc_unwind = .;                                 \
 872                 KEEP(*(.orc_unwind))                                    \
 873                 __stop_orc_unwind = .;                                  \
 874         }                                                               \
 875         text_size = _etext - _stext;                                    \
 876         . = ALIGN(4);                                                   \
 877         .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) {             \
 878                 orc_lookup = .;                                         \
 879                 . += (((text_size + LOOKUP_BLOCK_SIZE - 1) /            \
 880                         LOOKUP_BLOCK_SIZE) + 1) * 4;                    \
 881                 orc_lookup_end = .;                                     \
 882         }
 883 #else
 884 #define ORC_UNWIND_TABLE
 885 #endif
 886
 887 /* Built-in firmware blobs */
 888 #ifdef CONFIG_FW_LOADER
 889 #define FW_LOADER_BUILT_IN_DATA                                         \
 890         .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) {    \
 891                 __start_builtin_fw = .;                                 \
 892                 KEEP(*(.builtin_fw))                                    \
 893                 __end_builtin_fw = .;                                   \
 894         }
 895 #else
 896 #define FW_LOADER_BUILT_IN_DATA
 897 #endif
 898
 899 #ifdef CONFIG_PM_TRACE
 900 #define TRACEDATA                                                       \
 901         . = ALIGN(4);                                                   \
 902         .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {               \
 903                 __tracedata_start = .;                                  \
 904                 KEEP(*(.tracedata))                                     \
 905                 __tracedata_end = .;                                    \
 906         }
 907 #else
 908 #define TRACEDATA
 909 #endif
 910
 911 #ifdef CONFIG_PRINTK_INDEX
 912 #define PRINTK_INDEX                                                    \
 913         .printk_index : AT(ADDR(.printk_index) - LOAD_OFFSET) {         \
 914                 __start_printk_index = .;                               \
 915                 *(.printk_index)                                        \
 916                 __stop_printk_index = .;                                \
 917         }
 918 #else
 919 #define PRINTK_INDEX
 920 #endif
 921
 922 #define NOTES                                                           \
 923         .notes : AT(ADDR(.notes) - LOAD_OFFSET) {                       \
 924                 __start_notes = .;                                      \
 925                 KEEP(*(.note.*))                                        \
 926                 __stop_notes = .;                                       \
 927         } NOTES_HEADERS                                                 \
 928         NOTES_HEADERS_RESTORE
 929
 930 #define INIT_SETUP(initsetup_align)                                     \
 931                 . = ALIGN(initsetup_align);                             \
 932                 __setup_start = .;                                      \
 933                 KEEP(*(.init.setup))                                    \
 934                 __setup_end = .;
 935
 936 #define INIT_CALLS_LEVEL(level)                                         \
 937                 __initcall##level##_start = .;                          \
 938                 KEEP(*(.initcall##level##.init))                        \
 939                 KEEP(*(.initcall##level##s.init))                       \
 940
 941 #define INIT_CALLS                                                      \
 942                 __initcall_start = .;                                   \
 943                 KEEP(*(.initcallearly.init))                            \
 944                 INIT_CALLS_LEVEL(0)                                     \
 945                 INIT_CALLS_LEVEL(1)                                     \
 946                 INIT_CALLS_LEVEL(2)                                     \
 947                 INIT_CALLS_LEVEL(3)                                     \
 948                 INIT_CALLS_LEVEL(4)                                     \
 949                 INIT_CALLS_LEVEL(5)                                     \
 950                 INIT_CALLS_LEVEL(rootfs)                                \
 951                 INIT_CALLS_LEVEL(6)                                     \
 952                 INIT_CALLS_LEVEL(7)                                     \
 953                 __initcall_end = .;
 954
 955 #define CON_INITCALL                                                    \
 956                 __con_initcall_start = .;                               \
 957                 KEEP(*(.con_initcall.init))                             \
 958                 __con_initcall_end = .;
 959
 960 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */
 961 #define KUNIT_TABLE()                                                   \
 962                 . = ALIGN(8);                                           \
 963                 __kunit_suites_start = .;                               \
 964                 KEEP(*(.kunit_test_suites))                             \
 965                 __kunit_suites_end = .;
 966
 967 #ifdef CONFIG_BLK_DEV_INITRD
 968 #define INIT_RAM_FS                                                     \
 969         . = ALIGN(4);                                                   \
 970         __initramfs_start = .;                                          \
 971         KEEP(*(.init.ramfs))                                            \
 972         . = ALIGN(8);                                                   \
 973         KEEP(*(.init.ramfs.info))
 974 #else
 975 #define INIT_RAM_FS
 976 #endif
 977
 978 /*
 979  * Memory encryption operates on a page basis. Since we need to clear
 980  * the memory encryption mask for this section, it needs to be aligned
 981  * on a page boundary and be a page-size multiple in length.
 982  *
 983  * Note: We use a separate section so that only this section gets
 984  * decrypted to avoid exposing more than we wish.
 985  */
 986 #ifdef CONFIG_AMD_MEM_ENCRYPT
 987 #define PERCPU_DECRYPTED_SECTION                                        \
 988         . = ALIGN(PAGE_SIZE);                                           \
 989         *(.data..decrypted)                                             \
 990         *(.data..percpu..decrypted)                                     \
 991         . = ALIGN(PAGE_SIZE);
 992 #else
 993 #define PERCPU_DECRYPTED_SECTION
 994 #endif
 995
 996
 997 /*
 998  * Default discarded sections.
 999  *
1000  * Some archs want to discard exit text/data at runtime rather than
1001  * link time due to cross-section references such as alt instructions,
1002  * bug table, eh_frame, etc.  DISCARDS must be the last of output
1003  * section definitions so that such archs put those in earlier section
1004  * definitions.
1005  */
1006 #ifdef RUNTIME_DISCARD_EXIT
1007 #define EXIT_DISCARDS
1008 #else
1009 #define EXIT_DISCARDS                                                   \
1010         EXIT_TEXT                                                       \
1011         EXIT_DATA
1012 #endif
1013
1014 /*
1015  * Clang's -fprofile-arcs, -fsanitize=kernel-address, and
1016  * -fsanitize=thread produce unwanted sections (.eh_frame
1017  * and .init_array.*), but CONFIG_CONSTRUCTORS wants to
1018  * keep any .init_array.* sections.
1019  * https://bugs.llvm.org/show_bug.cgi?id=46478
1020  */
1021 #if defined(CONFIG_GCOV_KERNEL) || defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN)
1022 # ifdef CONFIG_CONSTRUCTORS
1023 #  define SANITIZER_DISCARDS                                            \
1024         *(.eh_frame)
1025 # else
1026 #  define SANITIZER_DISCARDS                                            \
1027         *(.init_array) *(.init_array.*)                                 \
1028         *(.eh_frame)
1029 # endif
1030 #else
1031 # define SANITIZER_DISCARDS
1032 #endif
1033
1034 #define COMMON_DISCARDS                                                 \
1035         SANITIZER_DISCARDS                                              \
1036         PATCHABLE_DISCARDS                                              \
1037         *(.discard)                                                     \
1038         *(.discard.*)                                                   \
1039         *(.modinfo)                                                     \
1040         /* ld.bfd warns about .gnu.version* even when not emitted */    \
1041         *(.gnu.version*)                                                \
1042
1043 #define DISCARDS                                                        \
1044         /DISCARD/ : {                                                   \
1045         EXIT_DISCARDS                                                   \
1046         EXIT_CALL                                                       \
1047         COMMON_DISCARDS                                                 \
1048         }
1049
1050 /**
1051  * PERCPU_INPUT - the percpu input sections
1052  * @cacheline: cacheline size
1053  *
1054  * The core percpu section names and core symbols which do not rely
1055  * directly upon load addresses.
1056  *
1057  * @cacheline is used to align subsections to avoid false cacheline
1058  * sharing between subsections for different purposes.
1059  */
1060 #define PERCPU_INPUT(cacheline)                                         \
1061         __per_cpu_start = .;                                            \
1062         *(.data..percpu..first)                                         \
1063         . = ALIGN(PAGE_SIZE);                                           \
1064         *(.data..percpu..page_aligned)                                  \
1065         . = ALIGN(cacheline);                                           \
1066         *(.data..percpu..read_mostly)                                   \
1067         . = ALIGN(cacheline);                                           \
1068         *(.data..percpu)                                                \
1069         *(.data..percpu..shared_aligned)                                \
1070         PERCPU_DECRYPTED_SECTION                                        \
1071         __per_cpu_end = .;
1072
1073 /**
1074  * PERCPU_VADDR - define output section for percpu area
1075  * @cacheline: cacheline size
1076  * @vaddr: explicit base address (optional)
1077  * @phdr: destination PHDR (optional)
1078  *
1079  * Macro which expands to output section for percpu area.
1080  *
1081  * @cacheline is used to align subsections to avoid false cacheline
1082  * sharing between subsections for different purposes.
1083  *
1084  * If @vaddr is not blank, it specifies explicit base address and all
1085  * percpu symbols will be offset from the given address.  If blank,
1086  * @vaddr always equals @laddr + LOAD_OFFSET.
1087  *
1088  * @phdr defines the output PHDR to use if not blank.  Be warned that
1089  * output PHDR is sticky.  If @phdr is specified, the next output
1090  * section in the linker script will go there too.  @phdr should have
1091  * a leading colon.
1092  *
1093  * Note that this macros defines __per_cpu_load as an absolute symbol.
1094  * If there is no need to put the percpu section at a predetermined
1095  * address, use PERCPU_SECTION.
1096  */
1097 #define PERCPU_VADDR(cacheline, vaddr, phdr)                            \
1098         __per_cpu_load = .;                                             \
1099         .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) {        \
1100                 PERCPU_INPUT(cacheline)                                 \
1101         } phdr                                                          \
1102         . = __per_cpu_load + SIZEOF(.data..percpu);
1103
1104 /**
1105  * PERCPU_SECTION - define output section for percpu area, simple version
1106  * @cacheline: cacheline size
1107  *
1108  * Align to PAGE_SIZE and outputs output section for percpu area.  This
1109  * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
1110  * __per_cpu_start will be identical.
1111  *
1112  * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
1113  * except that __per_cpu_load is defined as a relative symbol against
1114  * .data..percpu which is required for relocatable x86_32 configuration.
1115  */
1116 #define PERCPU_SECTION(cacheline)                                       \
1117         . = ALIGN(PAGE_SIZE);                                           \
1118         .data..percpu   : AT(ADDR(.data..percpu) - LOAD_OFFSET) {       \
1119                 __per_cpu_load = .;                                     \
1120                 PERCPU_INPUT(cacheline)                                 \
1121         }
1122
1123
1124 /*
1125  * Definition of the high level *_SECTION macros
1126  * They will fit only a subset of the architectures
1127  */
1128
1129
1130 /*
1131  * Writeable data.
1132  * All sections are combined in a single .data section.
1133  * The sections following CONSTRUCTORS are arranged so their
1134  * typical alignment matches.
1135  * A cacheline is typical/always less than a PAGE_SIZE so
1136  * the sections that has this restriction (or similar)
1137  * is located before the ones requiring PAGE_SIZE alignment.
1138  * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
1139  * matches the requirement of PAGE_ALIGNED_DATA.
1140  *
1141  * use 0 as page_align if page_aligned data is not used */
1142 #define RW_DATA(cacheline, pagealigned, inittask)                       \
1143         . = ALIGN(PAGE_SIZE);                                           \
1144         .data : AT(ADDR(.data) - LOAD_OFFSET) {                         \
1145                 INIT_TASK_DATA(inittask)                                \
1146                 NOSAVE_DATA                                             \
1147                 PAGE_ALIGNED_DATA(pagealigned)                          \
1148                 CACHELINE_ALIGNED_DATA(cacheline)                       \
1149                 READ_MOSTLY_DATA(cacheline)                             \
1150                 DATA_DATA                                               \
1151                 CONSTRUCTORS                                            \
1152         }                                                               \
1153         BUG_TABLE                                                       \
1154
1155 #define INIT_TEXT_SECTION(inittext_align)                               \
1156         . = ALIGN(inittext_align);                                      \
1157         .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {               \
1158                 _sinittext = .;                                         \
1159                 INIT_TEXT                                               \
1160                 _einittext = .;                                         \
1161         }
1162
1163 #define INIT_DATA_SECTION(initsetup_align)                              \
1164         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {               \
1165                 INIT_DATA                                               \
1166                 INIT_SETUP(initsetup_align)                             \
1167                 INIT_CALLS                                              \
1168                 CON_INITCALL                                            \
1169                 INIT_RAM_FS                                             \
1170         }
1171
1172 #define BSS_SECTION(sbss_align, bss_align, stop_align)                  \
1173         . = ALIGN(sbss_align);                                          \
1174         __bss_start = .;                                                \
1175         SBSS(sbss_align)                                                \
1176         BSS(bss_align)                                                  \
1177         . = ALIGN(stop_align);                                          \
1178         __bss_stop = .;