include/asm-generic/vmlinux.lds.h

   1 /*
   2  * Helper macros to support writing architecture specific
   3  * linker scripts.
   4  *
   5  * A minimal linker scripts has following content:
   6  * [This is a sample, architectures may have special requiriements]
   7  *
   8  * OUTPUT_FORMAT(...)
   9  * OUTPUT_ARCH(...)
  10  * ENTRY(...)
  11  * SECTIONS
  12  * {
  13  *      . = START;
  14  *      __init_begin = .;
  15  *      HEAD_TEXT_SECTION
  16  *      INIT_TEXT_SECTION(PAGE_SIZE)
  17  *      INIT_DATA_SECTION(...)
  18  *      PERCPU_SECTION(CACHELINE_SIZE)
  19  *      __init_end = .;
  20  *
  21  *      _stext = .;
  22  *      TEXT_SECTION = 0
  23  *      _etext = .;
  24  *
  25  *      _sdata = .;
  26  *      RO_DATA(PAGE_SIZE)
  27  *      RW_DATA(...)
  28  *      _edata = .;
  29  *
  30  *      EXCEPTION_TABLE(...)
  31  *
  32  *      BSS_SECTION(0, 0, 0)
  33  *      _end = .;
  34  *
  35  *      STABS_DEBUG
  36  *      DWARF_DEBUG
  37  *      ELF_DETAILS
  38  *
  39  *      DISCARDS                // must be the last
  40  * }
  41  *
  42  * [__init_begin, __init_end] is the init section that may be freed after init
  43  *      // __init_begin and __init_end should be page aligned, so that we can
  44  *      // free the whole .init memory
  45  * [_stext, _etext] is the text section
  46  * [_sdata, _edata] is the data section
  47  *
  48  * Some of the included output section have their own set of constants.
  49  * Examples are: [__initramfs_start, __initramfs_end] for initramfs and
  50  *               [__nosave_begin, __nosave_end] for the nosave data
  51  */
  52
  53 #ifndef LOAD_OFFSET
  54 #define LOAD_OFFSET 0
  55 #endif
  56
  57 /*
  58  * Only some architectures want to have the .notes segment visible in
  59  * a separate PT_NOTE ELF Program Header. When this happens, it needs
  60  * to be visible in both the kernel text's PT_LOAD and the PT_NOTE
  61  * Program Headers. In this case, though, the PT_LOAD needs to be made
  62  * the default again so that all the following sections don't also end
  63  * up in the PT_NOTE Program Header.
  64  */
  65 #ifdef EMITS_PT_NOTE
  66 #define NOTES_HEADERS           :text :note
  67 #define NOTES_HEADERS_RESTORE   __restore_ph : { *(.__restore_ph) } :text
  68 #else
  69 #define NOTES_HEADERS
  70 #define NOTES_HEADERS_RESTORE
  71 #endif
  72
  73 /*
  74  * Some architectures have non-executable read-only exception tables.
  75  * They can be added to the RO_DATA segment by specifying their desired
  76  * alignment.
  77  */
  78 #ifdef RO_EXCEPTION_TABLE_ALIGN
  79 #define RO_EXCEPTION_TABLE      EXCEPTION_TABLE(RO_EXCEPTION_TABLE_ALIGN)
  80 #else
  81 #define RO_EXCEPTION_TABLE
  82 #endif
  83
  84 /* Align . to a 8 byte boundary equals to maximum function alignment. */
  85 #define ALIGN_FUNCTION()  . = ALIGN(8)
  86
  87 /*
  88  * LD_DEAD_CODE_DATA_ELIMINATION option enables -fdata-sections, which
  89  * generates .data.identifier sections, which need to be pulled in with
  90  * .data. We don't want to pull in .data..other sections, which Linux
  91  * has defined. Same for text and bss.
  92  *
  93  * With LTO_CLANG, the linker also splits sections by default, so we need
  94  * these macros to combine the sections during the final link.
  95  *
  96  * RODATA_MAIN is not used because existing code already defines .rodata.x
  97  * sections to be brought in with rodata.
  98  */
  99 #if defined(CONFIG_LD_DEAD_CODE_DATA_ELIMINATION) || defined(CONFIG_LTO_CLANG)
 100 #define TEXT_MAIN .text .text.[0-9a-zA-Z_]*
 101 #define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..L* .data..compoundliteral* .data.$__unnamed_* .data.$L*
 102 #define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]*
 103 #define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]* .rodata..L*
 104 #define BSS_MAIN .bss .bss.[0-9a-zA-Z_]* .bss..compoundliteral*
 105 #define SBSS_MAIN .sbss .sbss.[0-9a-zA-Z_]*
 106 #else
 107 #define TEXT_MAIN .text
 108 #define DATA_MAIN .data
 109 #define SDATA_MAIN .sdata
 110 #define RODATA_MAIN .rodata
 111 #define BSS_MAIN .bss
 112 #define SBSS_MAIN .sbss
 113 #endif
 114
 115 /*
 116  * GCC 4.5 and later have a 32 bytes section alignment for structures.
 117  * Except GCC 4.9, that feels the need to align on 64 bytes.
 118  */
 119 #define STRUCT_ALIGNMENT 32
 120 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
 121
 122 /*
 123  * The order of the sched class addresses are important, as they are
 124  * used to determine the order of the priority of each sched class in
 125  * relation to each other.
 126  */
 127 #define SCHED_DATA                              \
 128         STRUCT_ALIGN();                         \
 129         __sched_class_highest = .;              \
 130         *(__stop_sched_class)                   \
 131         *(__dl_sched_class)                     \
 132         *(__rt_sched_class)                     \
 133         *(__fair_sched_class)                   \
 134         *(__idle_sched_class)                   \
 135         __sched_class_lowest = .;
 136
 137 /* The actual configuration determine if the init/exit sections
 138  * are handled as text/data or they can be discarded (which
 139  * often happens at runtime)
 140  */
 141 #ifdef CONFIG_HOTPLUG_CPU
 142 #define CPU_KEEP(sec)    *(.cpu##sec)
 143 #define CPU_DISCARD(sec)
 144 #else
 145 #define CPU_KEEP(sec)
 146 #define CPU_DISCARD(sec) *(.cpu##sec)
 147 #endif
 148
 149 #if defined(CONFIG_MEMORY_HOTPLUG)
 150 #define MEM_KEEP(sec)    *(.mem##sec)
 151 #define MEM_DISCARD(sec)
 152 #else
 153 #define MEM_KEEP(sec)
 154 #define MEM_DISCARD(sec) *(.mem##sec)
 155 #endif
 156
 157 #ifndef CONFIG_HAVE_DYNAMIC_FTRACE_NO_PATCHABLE
 158 #define KEEP_PATCHABLE          KEEP(*(__patchable_function_entries))
 159 #define PATCHABLE_DISCARDS
 160 #else
 161 #define KEEP_PATCHABLE
 162 #define PATCHABLE_DISCARDS      *(__patchable_function_entries)
 163 #endif
 164
 165 #ifndef CONFIG_ARCH_SUPPORTS_CFI_CLANG
 166 /*
 167  * Simply points to ftrace_stub, but with the proper protocol.
 168  * Defined by the linker script in linux/vmlinux.lds.h
 169  */
 170 #define FTRACE_STUB_HACK        ftrace_stub_graph = ftrace_stub;
 171 #else
 172 #define FTRACE_STUB_HACK
 173 #endif
 174
 175 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
 176 /*
 177  * The ftrace call sites are logged to a section whose name depends on the
 178  * compiler option used. A given kernel image will only use one, AKA
 179  * FTRACE_CALLSITE_SECTION. We capture all of them here to avoid header
 180  * dependencies for FTRACE_CALLSITE_SECTION's definition.
 181  *
 182  * ftrace_ops_list_func will be defined as arch_ftrace_ops_list_func
 183  * as some archs will have a different prototype for that function
 184  * but ftrace_ops_list_func() will have a single prototype.
 185  */
 186 #define MCOUNT_REC()    . = ALIGN(8);                           \
 187                         __start_mcount_loc = .;                 \
 188                         KEEP(*(__mcount_loc))                   \
 189                         KEEP_PATCHABLE                          \
 190                         __stop_mcount_loc = .;                  \
 191                         FTRACE_STUB_HACK                        \
 192                         ftrace_ops_list_func = arch_ftrace_ops_list_func;
 193 #else
 194 # ifdef CONFIG_FUNCTION_TRACER
 195 #  define MCOUNT_REC()  FTRACE_STUB_HACK                        \
 196                         ftrace_ops_list_func = arch_ftrace_ops_list_func;
 197 # else
 198 #  define MCOUNT_REC()
 199 # endif
 200 #endif
 201
 202 #ifdef CONFIG_TRACE_BRANCH_PROFILING
 203 #define LIKELY_PROFILE()        __start_annotated_branch_profile = .;   \
 204                                 KEEP(*(_ftrace_annotated_branch))       \
 205                                 __stop_annotated_branch_profile = .;
 206 #else
 207 #define LIKELY_PROFILE()
 208 #endif
 209
 210 #ifdef CONFIG_PROFILE_ALL_BRANCHES
 211 #define BRANCH_PROFILE()        __start_branch_profile = .;             \
 212                                 KEEP(*(_ftrace_branch))                 \
 213                                 __stop_branch_profile = .;
 214 #else
 215 #define BRANCH_PROFILE()
 216 #endif
 217
 218 #ifdef CONFIG_KPROBES
 219 #define KPROBE_BLACKLIST()      . = ALIGN(8);                                 \
 220                                 __start_kprobe_blacklist = .;                 \
 221                                 KEEP(*(_kprobe_blacklist))                    \
 222                                 __stop_kprobe_blacklist = .;
 223 #else
 224 #define KPROBE_BLACKLIST()
 225 #endif
 226
 227 #ifdef CONFIG_FUNCTION_ERROR_INJECTION
 228 #define ERROR_INJECT_WHITELIST()        STRUCT_ALIGN();                       \
 229                         __start_error_injection_whitelist = .;                \
 230                         KEEP(*(_error_injection_whitelist))                   \
 231                         __stop_error_injection_whitelist = .;
 232 #else
 233 #define ERROR_INJECT_WHITELIST()
 234 #endif
 235
 236 #ifdef CONFIG_EVENT_TRACING
 237 #define FTRACE_EVENTS() . = ALIGN(8);                                   \
 238                         __start_ftrace_events = .;                      \
 239                         KEEP(*(_ftrace_events))                         \
 240                         __stop_ftrace_events = .;                       \
 241                         __start_ftrace_eval_maps = .;                   \
 242                         KEEP(*(_ftrace_eval_map))                       \
 243                         __stop_ftrace_eval_maps = .;
 244 #else
 245 #define FTRACE_EVENTS()
 246 #endif
 247
 248 #ifdef CONFIG_TRACING
 249 #define TRACE_PRINTKS()  __start___trace_bprintk_fmt = .;      \
 250                          KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \
 251                          __stop___trace_bprintk_fmt = .;
 252 #define TRACEPOINT_STR() __start___tracepoint_str = .;  \
 253                          KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \
 254                          __stop___tracepoint_str = .;
 255 #else
 256 #define TRACE_PRINTKS()
 257 #define TRACEPOINT_STR()
 258 #endif
 259
 260 #ifdef CONFIG_FTRACE_SYSCALLS
 261 #define TRACE_SYSCALLS() . = ALIGN(8);                                  \
 262                          __start_syscalls_metadata = .;                 \
 263                          KEEP(*(__syscalls_metadata))                   \
 264                          __stop_syscalls_metadata = .;
 265 #else
 266 #define TRACE_SYSCALLS()
 267 #endif
 268
 269 #ifdef CONFIG_BPF_EVENTS
 270 #define BPF_RAW_TP() STRUCT_ALIGN();                                    \
 271                          __start__bpf_raw_tp = .;                       \
 272                          KEEP(*(__bpf_raw_tp_map))                      \
 273                          __stop__bpf_raw_tp = .;
 274 #else
 275 #define BPF_RAW_TP()
 276 #endif
 277
 278 #ifdef CONFIG_SERIAL_EARLYCON
 279 #define EARLYCON_TABLE() . = ALIGN(8);                          \
 280                          __earlycon_table = .;                  \
 281                          KEEP(*(__earlycon_table))              \
 282                          __earlycon_table_end = .;
 283 #else
 284 #define EARLYCON_TABLE()
 285 #endif
 286
 287 #ifdef CONFIG_SECURITY
 288 #define LSM_TABLE()     . = ALIGN(8);                                   \
 289                         __start_lsm_info = .;                           \
 290                         KEEP(*(.lsm_info.init))                         \
 291                         __end_lsm_info = .;
 292 #define EARLY_LSM_TABLE()       . = ALIGN(8);                           \
 293                         __start_early_lsm_info = .;                     \
 294                         KEEP(*(.early_lsm_info.init))                   \
 295                         __end_early_lsm_info = .;
 296 #else
 297 #define LSM_TABLE()
 298 #define EARLY_LSM_TABLE()
 299 #endif
 300
 301 #define ___OF_TABLE(cfg, name)  _OF_TABLE_##cfg(name)
 302 #define __OF_TABLE(cfg, name)   ___OF_TABLE(cfg, name)
 303 #define OF_TABLE(cfg, name)     __OF_TABLE(IS_ENABLED(cfg), name)
 304 #define _OF_TABLE_0(name)
 305 #define _OF_TABLE_1(name)                                               \
 306         . = ALIGN(8);                                                   \
 307         __##name##_of_table = .;                                        \
 308         KEEP(*(__##name##_of_table))                                    \
 309         KEEP(*(__##name##_of_table_end))
 310
 311 #define TIMER_OF_TABLES()       OF_TABLE(CONFIG_TIMER_OF, timer)
 312 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
 313 #define CLK_OF_TABLES()         OF_TABLE(CONFIG_COMMON_CLK, clk)
 314 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
 315 #define CPU_METHOD_OF_TABLES()  OF_TABLE(CONFIG_SMP, cpu_method)
 316 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method)
 317
 318 #ifdef CONFIG_ACPI
 319 #define ACPI_PROBE_TABLE(name)                                          \
 320         . = ALIGN(8);                                                   \
 321         __##name##_acpi_probe_table = .;                                \
 322         KEEP(*(__##name##_acpi_probe_table))                            \
 323         __##name##_acpi_probe_table_end = .;
 324 #else
 325 #define ACPI_PROBE_TABLE(name)
 326 #endif
 327
 328 #ifdef CONFIG_THERMAL
 329 #define THERMAL_TABLE(name)                                             \
 330         . = ALIGN(8);                                                   \
 331         __##name##_thermal_table = .;                                   \
 332         KEEP(*(__##name##_thermal_table))                               \
 333         __##name##_thermal_table_end = .;
 334 #else
 335 #define THERMAL_TABLE(name)
 336 #endif
 337
 338 #define KERNEL_DTB()                                                    \
 339         STRUCT_ALIGN();                                                 \
 340         __dtb_start = .;                                                \
 341         KEEP(*(.dtb.init.rodata))                                       \
 342         __dtb_end = .;
 343
 344 /*
 345  * .data section
 346  */
 347 #define DATA_DATA                                                       \
 348         *(.xiptext)                                                     \
 349         *(DATA_MAIN)                                                    \
 350         *(.data..decrypted)                                             \
 351         *(.ref.data)                                                    \
 352         *(.data..shared_aligned) /* percpu related */                   \
 353         MEM_KEEP(init.data*)                                            \
 354         MEM_KEEP(exit.data*)                                            \
 355         *(.data.unlikely)                                               \
 356         __start_once = .;                                               \
 357         *(.data.once)                                                   \
 358         __end_once = .;                                                 \
 359         STRUCT_ALIGN();                                                 \
 360         *(__tracepoints)                                                \
 361         /* implement dynamic printk debug */                            \
 362         . = ALIGN(8);                                                   \
 363         __start___dyndbg_classes = .;                                   \
 364         KEEP(*(__dyndbg_classes))                                       \
 365         __stop___dyndbg_classes = .;                                    \
 366         __start___dyndbg = .;                                           \
 367         KEEP(*(__dyndbg))                                               \
 368         __stop___dyndbg = .;                                            \
 369         LIKELY_PROFILE()                                                \
 370         BRANCH_PROFILE()                                                \
 371         TRACE_PRINTKS()                                                 \
 372         BPF_RAW_TP()                                                    \
 373         TRACEPOINT_STR()
 374
 375 /*
 376  * Data section helpers
 377  */
 378 #define NOSAVE_DATA                                                     \
 379         . = ALIGN(PAGE_SIZE);                                           \
 380         __nosave_begin = .;                                             \
 381         *(.data..nosave)                                                \
 382         . = ALIGN(PAGE_SIZE);                                           \
 383         __nosave_end = .;
 384
 385 #define PAGE_ALIGNED_DATA(page_align)                                   \
 386         . = ALIGN(page_align);                                          \
 387         *(.data..page_aligned)                                          \
 388         . = ALIGN(page_align);
 389
 390 #define READ_MOSTLY_DATA(align)                                         \
 391         . = ALIGN(align);                                               \
 392         *(.data..read_mostly)                                           \
 393         . = ALIGN(align);
 394
 395 #define CACHELINE_ALIGNED_DATA(align)                                   \
 396         . = ALIGN(align);                                               \
 397         *(.data..cacheline_aligned)
 398
 399 #define INIT_TASK_DATA(align)                                           \
 400         . = ALIGN(align);                                               \
 401         __start_init_task = .;                                          \
 402         init_thread_union = .;                                          \
 403         init_stack = .;                                                 \
 404         KEEP(*(.data..init_task))                                       \
 405         KEEP(*(.data..init_thread_info))                                \
 406         . = __start_init_task + THREAD_SIZE;                            \
 407         __end_init_task = .;
 408
 409 #define JUMP_TABLE_DATA                                                 \
 410         . = ALIGN(8);                                                   \
 411         __start___jump_table = .;                                       \
 412         KEEP(*(__jump_table))                                           \
 413         __stop___jump_table = .;
 414
 415 #ifdef CONFIG_HAVE_STATIC_CALL_INLINE
 416 #define STATIC_CALL_DATA                                                \
 417         . = ALIGN(8);                                                   \
 418         __start_static_call_sites = .;                                  \
 419         KEEP(*(.static_call_sites))                                     \
 420         __stop_static_call_sites = .;                                   \
 421         __start_static_call_tramp_key = .;                              \
 422         KEEP(*(.static_call_tramp_key))                                 \
 423         __stop_static_call_tramp_key = .;
 424 #else
 425 #define STATIC_CALL_DATA
 426 #endif
 427
 428 /*
 429  * Allow architectures to handle ro_after_init data on their
 430  * own by defining an empty RO_AFTER_INIT_DATA.
 431  */
 432 #ifndef RO_AFTER_INIT_DATA
 433 #define RO_AFTER_INIT_DATA                                              \
 434         . = ALIGN(8);                                                   \
 435         __start_ro_after_init = .;                                      \
 436         *(.data..ro_after_init)                                         \
 437         JUMP_TABLE_DATA                                                 \
 438         STATIC_CALL_DATA                                                \
 439         __end_ro_after_init = .;
 440 #endif
 441
 442 /*
 443  * .kcfi_traps contains a list KCFI trap locations.
 444  */
 445 #ifndef KCFI_TRAPS
 446 #ifdef CONFIG_ARCH_USES_CFI_TRAPS
 447 #define KCFI_TRAPS                                                      \
 448         __kcfi_traps : AT(ADDR(__kcfi_traps) - LOAD_OFFSET) {           \
 449                 __start___kcfi_traps = .;                               \
 450                 KEEP(*(.kcfi_traps))                                    \
 451                 __stop___kcfi_traps = .;                                \
 452         }
 453 #else
 454 #define KCFI_TRAPS
 455 #endif
 456 #endif
 457
 458 /*
 459  * Read only Data
 460  */
 461 #define RO_DATA(align)                                                  \
 462         . = ALIGN((align));                                             \
 463         .rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {           \
 464                 __start_rodata = .;                                     \
 465                 *(.rodata) *(.rodata.*)                                 \
 466                 SCHED_DATA                                              \
 467                 RO_AFTER_INIT_DATA      /* Read only after init */      \
 468                 . = ALIGN(8);                                           \
 469                 __start___tracepoints_ptrs = .;                         \
 470                 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \
 471                 __stop___tracepoints_ptrs = .;                          \
 472                 *(__tracepoints_strings)/* Tracepoints: strings */      \
 473         }                                                               \
 474                                                                         \
 475         .rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {          \
 476                 *(.rodata1)                                             \
 477         }                                                               \
 478                                                                         \
 479         /* PCI quirks */                                                \
 480         .pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {        \
 481                 __start_pci_fixups_early = .;                           \
 482                 KEEP(*(.pci_fixup_early))                               \
 483                 __end_pci_fixups_early = .;                             \
 484                 __start_pci_fixups_header = .;                          \
 485                 KEEP(*(.pci_fixup_header))                              \
 486                 __end_pci_fixups_header = .;                            \
 487                 __start_pci_fixups_final = .;                           \
 488                 KEEP(*(.pci_fixup_final))                               \
 489                 __end_pci_fixups_final = .;                             \
 490                 __start_pci_fixups_enable = .;                          \
 491                 KEEP(*(.pci_fixup_enable))                              \
 492                 __end_pci_fixups_enable = .;                            \
 493                 __start_pci_fixups_resume = .;                          \
 494                 KEEP(*(.pci_fixup_resume))                              \
 495                 __end_pci_fixups_resume = .;                            \
 496                 __start_pci_fixups_resume_early = .;                    \
 497                 KEEP(*(.pci_fixup_resume_early))                        \
 498                 __end_pci_fixups_resume_early = .;                      \
 499                 __start_pci_fixups_suspend = .;                         \
 500                 KEEP(*(.pci_fixup_suspend))                             \
 501                 __end_pci_fixups_suspend = .;                           \
 502                 __start_pci_fixups_suspend_late = .;                    \
 503                 KEEP(*(.pci_fixup_suspend_late))                        \
 504                 __end_pci_fixups_suspend_late = .;                      \
 505         }                                                               \
 506                                                                         \
 507         FW_LOADER_BUILT_IN_DATA                                         \
 508         TRACEDATA                                                       \
 509                                                                         \
 510         PRINTK_INDEX                                                    \
 511                                                                         \
 512         /* Kernel symbol table: Normal symbols */                       \
 513         __ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {         \
 514                 __start___ksymtab = .;                                  \
 515                 KEEP(*(SORT(___ksymtab+*)))                             \
 516                 __stop___ksymtab = .;                                   \
 517         }                                                               \
 518                                                                         \
 519         /* Kernel symbol table: GPL-only symbols */                     \
 520         __ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {     \
 521                 __start___ksymtab_gpl = .;                              \
 522                 KEEP(*(SORT(___ksymtab_gpl+*)))                         \
 523                 __stop___ksymtab_gpl = .;                               \
 524         }                                                               \
 525                                                                         \
 526         /* Kernel symbol table: Normal symbols */                       \
 527         __kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {         \
 528                 __start___kcrctab = .;                                  \
 529                 KEEP(*(SORT(___kcrctab+*)))                             \
 530                 __stop___kcrctab = .;                                   \
 531         }                                                               \
 532                                                                         \
 533         /* Kernel symbol table: GPL-only symbols */                     \
 534         __kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {     \
 535                 __start___kcrctab_gpl = .;                              \
 536                 KEEP(*(SORT(___kcrctab_gpl+*)))                         \
 537                 __stop___kcrctab_gpl = .;                               \
 538         }                                                               \
 539                                                                         \
 540         /* Kernel symbol table: strings */                              \
 541         __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
 542                 *(__ksymtab_strings)                                    \
 543         }                                                               \
 544                                                                         \
 545         /* __*init sections */                                          \
 546         __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {         \
 547                 *(.ref.rodata)                                          \
 548                 MEM_KEEP(init.rodata)                                   \
 549                 MEM_KEEP(exit.rodata)                                   \
 550         }                                                               \
 551                                                                         \
 552         /* Built-in module parameters. */                               \
 553         __param : AT(ADDR(__param) - LOAD_OFFSET) {                     \
 554                 __start___param = .;                                    \
 555                 KEEP(*(__param))                                        \
 556                 __stop___param = .;                                     \
 557         }                                                               \
 558                                                                         \
 559         /* Built-in module versions. */                                 \
 560         __modver : AT(ADDR(__modver) - LOAD_OFFSET) {                   \
 561                 __start___modver = .;                                   \
 562                 KEEP(*(__modver))                                       \
 563                 __stop___modver = .;                                    \
 564         }                                                               \
 565                                                                         \
 566         KCFI_TRAPS                                                      \
 567                                                                         \
 568         RO_EXCEPTION_TABLE                                              \
 569         NOTES                                                           \
 570         BTF                                                             \
 571                                                                         \
 572         . = ALIGN((align));                                             \
 573         __end_rodata = .;
 574
 575
 576 /*
 577  * Non-instrumentable text section
 578  */
 579 #define NOINSTR_TEXT                                                    \
 580                 ALIGN_FUNCTION();                                       \
 581                 __noinstr_text_start = .;                               \
 582                 *(.noinstr.text)                                        \
 583                 __noinstr_text_end = .;
 584
 585 /*
 586  * .text section. Map to function alignment to avoid address changes
 587  * during second ld run in second ld pass when generating System.map
 588  *
 589  * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead
 590  * code elimination is enabled, so these sections should be converted
 591  * to use ".." first.
 592  */
 593 #define TEXT_TEXT                                                       \
 594                 ALIGN_FUNCTION();                                       \
 595                 *(.text.hot .text.hot.*)                                \
 596                 *(TEXT_MAIN .text.fixup)                                \
 597                 *(.text.unlikely .text.unlikely.*)                      \
 598                 *(.text.unknown .text.unknown.*)                        \
 599                 NOINSTR_TEXT                                            \
 600                 *(.text..refcount)                                      \
 601                 *(.ref.text)                                            \
 602                 *(.text.asan.* .text.tsan.*)                            \
 603         MEM_KEEP(init.text*)                                            \
 604         MEM_KEEP(exit.text*)                                            \
 605
 606
 607 /* sched.text is aling to function alignment to secure we have same
 608  * address even at second ld pass when generating System.map */
 609 #define SCHED_TEXT                                                      \
 610                 ALIGN_FUNCTION();                                       \
 611                 __sched_text_start = .;                                 \
 612                 *(.sched.text)                                          \
 613                 __sched_text_end = .;
 614
 615 /* spinlock.text is aling to function alignment to secure we have same
 616  * address even at second ld pass when generating System.map */
 617 #define LOCK_TEXT                                                       \
 618                 ALIGN_FUNCTION();                                       \
 619                 __lock_text_start = .;                                  \
 620                 *(.spinlock.text)                                       \
 621                 __lock_text_end = .;
 622
 623 #define CPUIDLE_TEXT                                                    \
 624                 ALIGN_FUNCTION();                                       \
 625                 __cpuidle_text_start = .;                               \
 626                 *(.cpuidle.text)                                        \
 627                 __cpuidle_text_end = .;
 628
 629 #define KPROBES_TEXT                                                    \
 630                 ALIGN_FUNCTION();                                       \
 631                 __kprobes_text_start = .;                               \
 632                 *(.kprobes.text)                                        \
 633                 __kprobes_text_end = .;
 634
 635 #define ENTRY_TEXT                                                      \
 636                 ALIGN_FUNCTION();                                       \
 637                 __entry_text_start = .;                                 \
 638                 *(.entry.text)                                          \
 639                 __entry_text_end = .;
 640
 641 #define IRQENTRY_TEXT                                                   \
 642                 ALIGN_FUNCTION();                                       \
 643                 __irqentry_text_start = .;                              \
 644                 *(.irqentry.text)                                       \
 645                 __irqentry_text_end = .;
 646
 647 #define SOFTIRQENTRY_TEXT                                               \
 648                 ALIGN_FUNCTION();                                       \
 649                 __softirqentry_text_start = .;                          \
 650                 *(.softirqentry.text)                                   \
 651                 __softirqentry_text_end = .;
 652
 653 #define STATIC_CALL_TEXT                                                \
 654                 ALIGN_FUNCTION();                                       \
 655                 __static_call_text_start = .;                           \
 656                 *(.static_call.text)                                    \
 657                 __static_call_text_end = .;
 658
 659 /* Section used for early init (in .S files) */
 660 #define HEAD_TEXT  KEEP(*(.head.text))
 661
 662 #define HEAD_TEXT_SECTION                                                       \
 663         .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {               \
 664                 HEAD_TEXT                                               \
 665         }
 666
 667 /*
 668  * Exception table
 669  */
 670 #define EXCEPTION_TABLE(align)                                          \
 671         . = ALIGN(align);                                               \
 672         __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {               \
 673                 __start___ex_table = .;                                 \
 674                 KEEP(*(__ex_table))                                     \
 675                 __stop___ex_table = .;                                  \
 676         }
 677
 678 /*
 679  * .BTF
 680  */
 681 #ifdef CONFIG_DEBUG_INFO_BTF
 682 #define BTF                                                             \
 683         .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) {                           \
 684                 __start_BTF = .;                                        \
 685                 KEEP(*(.BTF))                                           \
 686                 __stop_BTF = .;                                         \
 687         }                                                               \
 688         . = ALIGN(4);                                                   \
 689         .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) {                   \
 690                 *(.BTF_ids)                                             \
 691         }
 692 #else
 693 #define BTF
 694 #endif
 695
 696 /*
 697  * Init task
 698  */
 699 #define INIT_TASK_DATA_SECTION(align)                                   \
 700         . = ALIGN(align);                                               \
 701         .data..init_task :  AT(ADDR(.data..init_task) - LOAD_OFFSET) {  \
 702                 INIT_TASK_DATA(align)                                   \
 703         }
 704
 705 #ifdef CONFIG_CONSTRUCTORS
 706 #define KERNEL_CTORS()  . = ALIGN(8);                      \
 707                         __ctors_start = .;                 \
 708                         KEEP(*(SORT(.ctors.*)))            \
 709                         KEEP(*(.ctors))                    \
 710                         KEEP(*(SORT(.init_array.*)))       \
 711                         KEEP(*(.init_array))               \
 712                         __ctors_end = .;
 713 #else
 714 #define KERNEL_CTORS()
 715 #endif
 716
 717 /* init and exit section handling */
 718 #define INIT_DATA                                                       \
 719         KEEP(*(SORT(___kentry+*)))                                      \
 720         *(.init.data init.data.*)                                       \
 721         MEM_DISCARD(init.data*)                                         \
 722         KERNEL_CTORS()                                                  \
 723         MCOUNT_REC()                                                    \
 724         *(.init.rodata .init.rodata.*)                                  \
 725         FTRACE_EVENTS()                                                 \
 726         TRACE_SYSCALLS()                                                \
 727         KPROBE_BLACKLIST()                                              \
 728         ERROR_INJECT_WHITELIST()                                        \
 729         MEM_DISCARD(init.rodata)                                        \
 730         CLK_OF_TABLES()                                                 \
 731         RESERVEDMEM_OF_TABLES()                                         \
 732         TIMER_OF_TABLES()                                               \
 733         CPU_METHOD_OF_TABLES()                                          \
 734         CPUIDLE_METHOD_OF_TABLES()                                      \
 735         KERNEL_DTB()                                                    \
 736         IRQCHIP_OF_MATCH_TABLE()                                        \
 737         ACPI_PROBE_TABLE(irqchip)                                       \
 738         ACPI_PROBE_TABLE(timer)                                         \
 739         THERMAL_TABLE(governor)                                         \
 740         EARLYCON_TABLE()                                                \
 741         LSM_TABLE()                                                     \
 742         EARLY_LSM_TABLE()                                               \
 743         KUNIT_TABLE()
 744
 745 #define INIT_TEXT                                                       \
 746         *(.init.text .init.text.*)                                      \
 747         *(.text.startup)                                                \
 748         MEM_DISCARD(init.text*)
 749
 750 #define EXIT_DATA                                                       \
 751         *(.exit.data .exit.data.*)                                      \
 752         *(.fini_array .fini_array.*)                                    \
 753         *(.dtors .dtors.*)                                              \
 754         MEM_DISCARD(exit.data*)                                         \
 755         MEM_DISCARD(exit.rodata*)
 756
 757 #define EXIT_TEXT                                                       \
 758         *(.exit.text)                                                   \
 759         *(.text.exit)                                                   \
 760         MEM_DISCARD(exit.text)
 761
 762 #define EXIT_CALL                                                       \
 763         *(.exitcall.exit)
 764
 765 /*
 766  * bss (Block Started by Symbol) - uninitialized data
 767  * zeroed during startup
 768  */
 769 #define SBSS(sbss_align)                                                \
 770         . = ALIGN(sbss_align);                                          \
 771         .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {                         \
 772                 *(.dynsbss)                                             \
 773                 *(SBSS_MAIN)                                            \
 774                 *(.scommon)                                             \
 775         }
 776
 777 /*
 778  * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
 779  * sections to the front of bss.
 780  */
 781 #ifndef BSS_FIRST_SECTIONS
 782 #define BSS_FIRST_SECTIONS
 783 #endif
 784
 785 #define BSS(bss_align)                                                  \
 786         . = ALIGN(bss_align);                                           \
 787         .bss : AT(ADDR(.bss) - LOAD_OFFSET) {                           \
 788                 BSS_FIRST_SECTIONS                                      \
 789                 . = ALIGN(PAGE_SIZE);                                   \
 790                 *(.bss..page_aligned)                                   \
 791                 . = ALIGN(PAGE_SIZE);                                   \
 792                 *(.dynbss)                                              \
 793                 *(BSS_MAIN)                                             \
 794                 *(COMMON)                                               \
 795         }
 796
 797 /*
 798  * DWARF debug sections.
 799  * Symbols in the DWARF debugging sections are relative to
 800  * the beginning of the section so we begin them at 0.
 801  */
 802 #define DWARF_DEBUG                                                     \
 803                 /* DWARF 1 */                                           \
 804                 .debug          0 : { *(.debug) }                       \
 805                 .line           0 : { *(.line) }                        \
 806                 /* GNU DWARF 1 extensions */                            \
 807                 .debug_srcinfo  0 : { *(.debug_srcinfo) }               \
 808                 .debug_sfnames  0 : { *(.debug_sfnames) }               \
 809                 /* DWARF 1.1 and DWARF 2 */                             \
 810                 .debug_aranges  0 : { *(.debug_aranges) }               \
 811                 .debug_pubnames 0 : { *(.debug_pubnames) }              \
 812                 /* DWARF 2 */                                           \
 813                 .debug_info     0 : { *(.debug_info                     \
 814                                 .gnu.linkonce.wi.*) }                   \
 815                 .debug_abbrev   0 : { *(.debug_abbrev) }                \
 816                 .debug_line     0 : { *(.debug_line) }                  \
 817                 .debug_frame    0 : { *(.debug_frame) }                 \
 818                 .debug_str      0 : { *(.debug_str) }                   \
 819                 .debug_loc      0 : { *(.debug_loc) }                   \
 820                 .debug_macinfo  0 : { *(.debug_macinfo) }               \
 821                 .debug_pubtypes 0 : { *(.debug_pubtypes) }              \
 822                 /* DWARF 3 */                                           \
 823                 .debug_ranges   0 : { *(.debug_ranges) }                \
 824                 /* SGI/MIPS DWARF 2 extensions */                       \
 825                 .debug_weaknames 0 : { *(.debug_weaknames) }            \
 826                 .debug_funcnames 0 : { *(.debug_funcnames) }            \
 827                 .debug_typenames 0 : { *(.debug_typenames) }            \
 828                 .debug_varnames  0 : { *(.debug_varnames) }             \
 829                 /* GNU DWARF 2 extensions */                            \
 830                 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) }      \
 831                 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) }      \
 832                 /* DWARF 4 */                                           \
 833                 .debug_types    0 : { *(.debug_types) }                 \
 834                 /* DWARF 5 */                                           \
 835                 .debug_addr     0 : { *(.debug_addr) }                  \
 836                 .debug_line_str 0 : { *(.debug_line_str) }              \
 837                 .debug_loclists 0 : { *(.debug_loclists) }              \
 838                 .debug_macro    0 : { *(.debug_macro) }                 \
 839                 .debug_names    0 : { *(.debug_names) }                 \
 840                 .debug_rnglists 0 : { *(.debug_rnglists) }              \
 841                 .debug_str_offsets      0 : { *(.debug_str_offsets) }
 842
 843 /* Stabs debugging sections. */
 844 #define STABS_DEBUG                                                     \
 845                 .stab 0 : { *(.stab) }                                  \
 846                 .stabstr 0 : { *(.stabstr) }                            \
 847                 .stab.excl 0 : { *(.stab.excl) }                        \
 848                 .stab.exclstr 0 : { *(.stab.exclstr) }                  \
 849                 .stab.index 0 : { *(.stab.index) }                      \
 850                 .stab.indexstr 0 : { *(.stab.indexstr) }
 851
 852 /* Required sections not related to debugging. */
 853 #define ELF_DETAILS                                                     \
 854                 .comment 0 : { *(.comment) }                            \
 855                 .symtab 0 : { *(.symtab) }                              \
 856                 .strtab 0 : { *(.strtab) }                              \
 857                 .shstrtab 0 : { *(.shstrtab) }
 858
 859 #ifdef CONFIG_GENERIC_BUG
 860 #define BUG_TABLE                                                       \
 861         . = ALIGN(8);                                                   \
 862         __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {             \
 863                 __start___bug_table = .;                                \
 864                 KEEP(*(__bug_table))                                    \
 865                 __stop___bug_table = .;                                 \
 866         }
 867 #else
 868 #define BUG_TABLE
 869 #endif
 870
 871 #ifdef CONFIG_UNWINDER_ORC
 872 #define ORC_UNWIND_TABLE                                                \
 873         . = ALIGN(4);                                                   \
 874         .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) {       \
 875                 __start_orc_unwind_ip = .;                              \
 876                 KEEP(*(.orc_unwind_ip))                                 \
 877                 __stop_orc_unwind_ip = .;                               \
 878         }                                                               \
 879         . = ALIGN(2);                                                   \
 880         .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) {             \
 881                 __start_orc_unwind = .;                                 \
 882                 KEEP(*(.orc_unwind))                                    \
 883                 __stop_orc_unwind = .;                                  \
 884         }                                                               \
 885         text_size = _etext - _stext;                                    \
 886         . = ALIGN(4);                                                   \
 887         .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) {             \
 888                 orc_lookup = .;                                         \
 889                 . += (((text_size + LOOKUP_BLOCK_SIZE - 1) /            \
 890                         LOOKUP_BLOCK_SIZE) + 1) * 4;                    \
 891                 orc_lookup_end = .;                                     \
 892         }
 893 #else
 894 #define ORC_UNWIND_TABLE
 895 #endif
 896
 897 /* Built-in firmware blobs */
 898 #ifdef CONFIG_FW_LOADER
 899 #define FW_LOADER_BUILT_IN_DATA                                         \
 900         .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) {    \
 901                 __start_builtin_fw = .;                                 \
 902                 KEEP(*(.builtin_fw))                                    \
 903                 __end_builtin_fw = .;                                   \
 904         }
 905 #else
 906 #define FW_LOADER_BUILT_IN_DATA
 907 #endif
 908
 909 #ifdef CONFIG_PM_TRACE
 910 #define TRACEDATA                                                       \
 911         . = ALIGN(4);                                                   \
 912         .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {               \
 913                 __tracedata_start = .;                                  \
 914                 KEEP(*(.tracedata))                                     \
 915                 __tracedata_end = .;                                    \
 916         }
 917 #else
 918 #define TRACEDATA
 919 #endif
 920
 921 #ifdef CONFIG_PRINTK_INDEX
 922 #define PRINTK_INDEX                                                    \
 923         .printk_index : AT(ADDR(.printk_index) - LOAD_OFFSET) {         \
 924                 __start_printk_index = .;                               \
 925                 *(.printk_index)                                        \
 926                 __stop_printk_index = .;                                \
 927         }
 928 #else
 929 #define PRINTK_INDEX
 930 #endif
 931
 932 #define NOTES                                                           \
 933         .notes : AT(ADDR(.notes) - LOAD_OFFSET) {                       \
 934                 __start_notes = .;                                      \
 935                 KEEP(*(.note.*))                                        \
 936                 __stop_notes = .;                                       \
 937         } NOTES_HEADERS                                                 \
 938         NOTES_HEADERS_RESTORE
 939
 940 #define INIT_SETUP(initsetup_align)                                     \
 941                 . = ALIGN(initsetup_align);                             \
 942                 __setup_start = .;                                      \
 943                 KEEP(*(.init.setup))                                    \
 944                 __setup_end = .;
 945
 946 #define INIT_CALLS_LEVEL(level)                                         \
 947                 __initcall##level##_start = .;                          \
 948                 KEEP(*(.initcall##level##.init))                        \
 949                 KEEP(*(.initcall##level##s.init))                       \
 950
 951 #define INIT_CALLS                                                      \
 952                 __initcall_start = .;                                   \
 953                 KEEP(*(.initcallearly.init))                            \
 954                 INIT_CALLS_LEVEL(0)                                     \
 955                 INIT_CALLS_LEVEL(1)                                     \
 956                 INIT_CALLS_LEVEL(2)                                     \
 957                 INIT_CALLS_LEVEL(3)                                     \
 958                 INIT_CALLS_LEVEL(4)                                     \
 959                 INIT_CALLS_LEVEL(5)                                     \
 960                 INIT_CALLS_LEVEL(rootfs)                                \
 961                 INIT_CALLS_LEVEL(6)                                     \
 962                 INIT_CALLS_LEVEL(7)                                     \
 963                 __initcall_end = .;
 964
 965 #define CON_INITCALL                                                    \
 966                 __con_initcall_start = .;                               \
 967                 KEEP(*(.con_initcall.init))                             \
 968                 __con_initcall_end = .;
 969
 970 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */
 971 #define KUNIT_TABLE()                                                   \
 972                 . = ALIGN(8);                                           \
 973                 __kunit_suites_start = .;                               \
 974                 KEEP(*(.kunit_test_suites))                             \
 975                 __kunit_suites_end = .;
 976
 977 #ifdef CONFIG_BLK_DEV_INITRD
 978 #define INIT_RAM_FS                                                     \
 979         . = ALIGN(4);                                                   \
 980         __initramfs_start = .;                                          \
 981         KEEP(*(.init.ramfs))                                            \
 982         . = ALIGN(8);                                                   \
 983         KEEP(*(.init.ramfs.info))
 984 #else
 985 #define INIT_RAM_FS
 986 #endif
 987
 988 /*
 989  * Memory encryption operates on a page basis. Since we need to clear
 990  * the memory encryption mask for this section, it needs to be aligned
 991  * on a page boundary and be a page-size multiple in length.
 992  *
 993  * Note: We use a separate section so that only this section gets
 994  * decrypted to avoid exposing more than we wish.
 995  */
 996 #ifdef CONFIG_AMD_MEM_ENCRYPT
 997 #define PERCPU_DECRYPTED_SECTION                                        \
 998         . = ALIGN(PAGE_SIZE);                                           \
 999         *(.data..percpu..decrypted)                                     \
1000         . = ALIGN(PAGE_SIZE);
1001 #else
1002 #define PERCPU_DECRYPTED_SECTION
1003 #endif
1004
1005
1006 /*
1007  * Default discarded sections.
1008  *
1009  * Some archs want to discard exit text/data at runtime rather than
1010  * link time due to cross-section references such as alt instructions,
1011  * bug table, eh_frame, etc.  DISCARDS must be the last of output
1012  * section definitions so that such archs put those in earlier section
1013  * definitions.
1014  */
1015 #ifdef RUNTIME_DISCARD_EXIT
1016 #define EXIT_DISCARDS
1017 #else
1018 #define EXIT_DISCARDS                                                   \
1019         EXIT_TEXT                                                       \
1020         EXIT_DATA
1021 #endif
1022
1023 /*
1024  * Clang's -fprofile-arcs, -fsanitize=kernel-address, and
1025  * -fsanitize=thread produce unwanted sections (.eh_frame
1026  * and .init_array.*), but CONFIG_CONSTRUCTORS wants to
1027  * keep any .init_array.* sections.
1028  * https://bugs.llvm.org/show_bug.cgi?id=46478
1029  */
1030 #ifdef CONFIG_UNWIND_TABLES
1031 #define DISCARD_EH_FRAME
1032 #else
1033 #define DISCARD_EH_FRAME        *(.eh_frame)
1034 #endif
1035 #if defined(CONFIG_GCOV_KERNEL) || defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN)
1036 # ifdef CONFIG_CONSTRUCTORS
1037 #  define SANITIZER_DISCARDS                                            \
1038         DISCARD_EH_FRAME
1039 # else
1040 #  define SANITIZER_DISCARDS                                            \
1041         *(.init_array) *(.init_array.*)                                 \
1042         DISCARD_EH_FRAME
1043 # endif
1044 #else
1045 # define SANITIZER_DISCARDS
1046 #endif
1047
1048 #define COMMON_DISCARDS                                                 \
1049         SANITIZER_DISCARDS                                              \
1050         PATCHABLE_DISCARDS                                              \
1051         *(.discard)                                                     \
1052         *(.discard.*)                                                   \
1053         *(.modinfo)                                                     \
1054         /* ld.bfd warns about .gnu.version* even when not emitted */    \
1055         *(.gnu.version*)                                                \
1056
1057 #define DISCARDS                                                        \
1058         /DISCARD/ : {                                                   \
1059         EXIT_DISCARDS                                                   \
1060         EXIT_CALL                                                       \
1061         COMMON_DISCARDS                                                 \
1062         }
1063
1064 /**
1065  * PERCPU_INPUT - the percpu input sections
1066  * @cacheline: cacheline size
1067  *
1068  * The core percpu section names and core symbols which do not rely
1069  * directly upon load addresses.
1070  *
1071  * @cacheline is used to align subsections to avoid false cacheline
1072  * sharing between subsections for different purposes.
1073  */
1074 #define PERCPU_INPUT(cacheline)                                         \
1075         __per_cpu_start = .;                                            \
1076         *(.data..percpu..first)                                         \
1077         . = ALIGN(PAGE_SIZE);                                           \
1078         *(.data..percpu..page_aligned)                                  \
1079         . = ALIGN(cacheline);                                           \
1080         *(.data..percpu..read_mostly)                                   \
1081         . = ALIGN(cacheline);                                           \
1082         *(.data..percpu)                                                \
1083         *(.data..percpu..shared_aligned)                                \
1084         PERCPU_DECRYPTED_SECTION                                        \
1085         __per_cpu_end = .;
1086
1087 /**
1088  * PERCPU_VADDR - define output section for percpu area
1089  * @cacheline: cacheline size
1090  * @vaddr: explicit base address (optional)
1091  * @phdr: destination PHDR (optional)
1092  *
1093  * Macro which expands to output section for percpu area.
1094  *
1095  * @cacheline is used to align subsections to avoid false cacheline
1096  * sharing between subsections for different purposes.
1097  *
1098  * If @vaddr is not blank, it specifies explicit base address and all
1099  * percpu symbols will be offset from the given address.  If blank,
1100  * @vaddr always equals @laddr + LOAD_OFFSET.
1101  *
1102  * @phdr defines the output PHDR to use if not blank.  Be warned that
1103  * output PHDR is sticky.  If @phdr is specified, the next output
1104  * section in the linker script will go there too.  @phdr should have
1105  * a leading colon.
1106  *
1107  * Note that this macros defines __per_cpu_load as an absolute symbol.
1108  * If there is no need to put the percpu section at a predetermined
1109  * address, use PERCPU_SECTION.
1110  */
1111 #define PERCPU_VADDR(cacheline, vaddr, phdr)                            \
1112         __per_cpu_load = .;                                             \
1113         .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) {        \
1114                 PERCPU_INPUT(cacheline)                                 \
1115         } phdr                                                          \
1116         . = __per_cpu_load + SIZEOF(.data..percpu);
1117
1118 /**
1119  * PERCPU_SECTION - define output section for percpu area, simple version
1120  * @cacheline: cacheline size
1121  *
1122  * Align to PAGE_SIZE and outputs output section for percpu area.  This
1123  * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
1124  * __per_cpu_start will be identical.
1125  *
1126  * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
1127  * except that __per_cpu_load is defined as a relative symbol against
1128  * .data..percpu which is required for relocatable x86_32 configuration.
1129  */
1130 #define PERCPU_SECTION(cacheline)                                       \
1131         . = ALIGN(PAGE_SIZE);                                           \
1132         .data..percpu   : AT(ADDR(.data..percpu) - LOAD_OFFSET) {       \
1133                 __per_cpu_load = .;                                     \
1134                 PERCPU_INPUT(cacheline)                                 \
1135         }
1136
1137
1138 /*
1139  * Definition of the high level *_SECTION macros
1140  * They will fit only a subset of the architectures
1141  */
1142
1143
1144 /*
1145  * Writeable data.
1146  * All sections are combined in a single .data section.
1147  * The sections following CONSTRUCTORS are arranged so their
1148  * typical alignment matches.
1149  * A cacheline is typical/always less than a PAGE_SIZE so
1150  * the sections that has this restriction (or similar)
1151  * is located before the ones requiring PAGE_SIZE alignment.
1152  * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
1153  * matches the requirement of PAGE_ALIGNED_DATA.
1154  *
1155  * use 0 as page_align if page_aligned data is not used */
1156 #define RW_DATA(cacheline, pagealigned, inittask)                       \
1157         . = ALIGN(PAGE_SIZE);                                           \
1158         .data : AT(ADDR(.data) - LOAD_OFFSET) {                         \
1159                 INIT_TASK_DATA(inittask)                                \
1160                 NOSAVE_DATA                                             \
1161                 PAGE_ALIGNED_DATA(pagealigned)                          \
1162                 CACHELINE_ALIGNED_DATA(cacheline)                       \
1163                 READ_MOSTLY_DATA(cacheline)                             \
1164                 DATA_DATA                                               \
1165                 CONSTRUCTORS                                            \
1166         }                                                               \
1167         BUG_TABLE                                                       \
1168
1169 #define INIT_TEXT_SECTION(inittext_align)                               \
1170         . = ALIGN(inittext_align);                                      \
1171         .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {               \
1172                 _sinittext = .;                                         \
1173                 INIT_TEXT                                               \
1174                 _einittext = .;                                         \
1175         }
1176
1177 #define INIT_DATA_SECTION(initsetup_align)                              \
1178         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {               \
1179                 INIT_DATA                                               \
1180                 INIT_SETUP(initsetup_align)                             \
1181                 INIT_CALLS                                              \
1182                 CON_INITCALL                                            \
1183                 INIT_RAM_FS                                             \
1184         }
1185
1186 #define BSS_SECTION(sbss_align, bss_align, stop_align)                  \
1187         . = ALIGN(sbss_align);                                          \
1188         __bss_start = .;                                                \
1189         SBSS(sbss_align)                                                \
1190         BSS(bss_align)                                                  \
1191         . = ALIGN(stop_align);                                          \
1192         __bss_stop = .;