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