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 requirements]
   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 #include <asm-generic/codetag.lds.h>
  54
  55 #ifndef LOAD_OFFSET
  56 #define LOAD_OFFSET 0
  57 #endif
  58
  59 /*
  60  * Only some architectures want to have the .notes segment visible in
  61  * a separate PT_NOTE ELF Program Header. When this happens, it needs
  62  * to be visible in both the kernel text's PT_LOAD and the PT_NOTE
  63  * Program Headers. In this case, though, the PT_LOAD needs to be made
  64  * the default again so that all the following sections don't also end
  65  * up in the PT_NOTE Program Header.
  66  */
  67 #ifdef EMITS_PT_NOTE
  68 #define NOTES_HEADERS           :text :note
  69 #define NOTES_HEADERS_RESTORE   __restore_ph : { *(.__restore_ph) } :text
  70 #else
  71 #define NOTES_HEADERS
  72 #define NOTES_HEADERS_RESTORE
  73 #endif
  74
  75 /*
  76  * Some architectures have non-executable read-only exception tables.
  77  * They can be added to the RO_DATA segment by specifying their desired
  78  * alignment.
  79  */
  80 #ifdef RO_EXCEPTION_TABLE_ALIGN
  81 #define RO_EXCEPTION_TABLE      EXCEPTION_TABLE(RO_EXCEPTION_TABLE_ALIGN)
  82 #else
  83 #define RO_EXCEPTION_TABLE
  84 #endif
  85
  86 /* Align . function alignment. */
  87 #define ALIGN_FUNCTION()  . = ALIGN(CONFIG_FUNCTION_ALIGNMENT)
  88
  89 /*
  90  * LD_DEAD_CODE_DATA_ELIMINATION option enables -fdata-sections, which
  91  * generates .data.identifier sections, which need to be pulled in with
  92  * .data. We don't want to pull in .data..other sections, which Linux
  93  * has defined. Same for text and bss.
  94  *
  95  * With LTO_CLANG, the linker also splits sections by default, so we need
  96  * these macros to combine the sections during the final link.
  97  *
  98  * With AUTOFDO_CLANG and PROPELLER_CLANG, by default, the linker splits
  99  * text sections and regroups functions into subsections.
 100  *
 101  * RODATA_MAIN is not used because existing code already defines .rodata.x
 102  * sections to be brought in with rodata.
 103  */
 104 #if defined(CONFIG_LD_DEAD_CODE_DATA_ELIMINATION) || defined(CONFIG_LTO_CLANG) || \
 105 defined(CONFIG_AUTOFDO_CLANG) || defined(CONFIG_PROPELLER_CLANG)
 106 #define TEXT_MAIN .text .text.[0-9a-zA-Z_]*
 107 #else
 108 #define TEXT_MAIN .text
 109 #endif
 110 #if defined(CONFIG_LD_DEAD_CODE_DATA_ELIMINATION) || defined(CONFIG_LTO_CLANG)
 111 #define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..L* .data..compoundliteral* .data.$__unnamed_* .data.$L*
 112 #define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]*
 113 #define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]* .rodata..L*
 114 #define BSS_MAIN .bss .bss.[0-9a-zA-Z_]* .bss..L* .bss..compoundliteral*
 115 #define SBSS_MAIN .sbss .sbss.[0-9a-zA-Z_]*
 116 #else
 117 #define DATA_MAIN .data
 118 #define SDATA_MAIN .sdata
 119 #define RODATA_MAIN .rodata
 120 #define BSS_MAIN .bss
 121 #define SBSS_MAIN .sbss
 122 #endif
 123
 124 /*
 125  * GCC 4.5 and later have a 32 bytes section alignment for structures.
 126  * Except GCC 4.9, that feels the need to align on 64 bytes.
 127  */
 128 #define STRUCT_ALIGNMENT 32
 129 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
 130
 131 /*
 132  * The order of the sched class addresses are important, as they are
 133  * used to determine the order of the priority of each sched class in
 134  * relation to each other.
 135  */
 136 #define SCHED_DATA                              \
 137         STRUCT_ALIGN();                         \
 138         __sched_class_highest = .;              \
 139         *(__stop_sched_class)                   \
 140         *(__dl_sched_class)                     \
 141         *(__rt_sched_class)                     \
 142         *(__fair_sched_class)                   \
 143         *(__ext_sched_class)                    \
 144         *(__idle_sched_class)                   \
 145         __sched_class_lowest = .;
 146
 147 /* The actual configuration determine if the init/exit sections
 148  * are handled as text/data or they can be discarded (which
 149  * often happens at runtime)
 150  */
 151
 152 #ifndef CONFIG_HAVE_DYNAMIC_FTRACE_NO_PATCHABLE
 153 #define KEEP_PATCHABLE          KEEP(*(__patchable_function_entries))
 154 #define PATCHABLE_DISCARDS
 155 #else
 156 #define KEEP_PATCHABLE
 157 #define PATCHABLE_DISCARDS      *(__patchable_function_entries)
 158 #endif
 159
 160 #ifndef CONFIG_ARCH_SUPPORTS_CFI_CLANG
 161 /*
 162  * Simply points to ftrace_stub, but with the proper protocol.
 163  * Defined by the linker script in linux/vmlinux.lds.h
 164  */
 165 #define FTRACE_STUB_HACK        ftrace_stub_graph = ftrace_stub;
 166 #else
 167 #define FTRACE_STUB_HACK
 168 #endif
 169
 170 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
 171 /*
 172  * The ftrace call sites are logged to a section whose name depends on the
 173  * compiler option used. A given kernel image will only use one, AKA
 174  * FTRACE_CALLSITE_SECTION. We capture all of them here to avoid header
 175  * dependencies for FTRACE_CALLSITE_SECTION's definition.
 176  *
 177  * ftrace_ops_list_func will be defined as arch_ftrace_ops_list_func
 178  * as some archs will have a different prototype for that function
 179  * but ftrace_ops_list_func() will have a single prototype.
 180  */
 181 #define MCOUNT_REC()    . = ALIGN(8);                           \
 182                         __start_mcount_loc = .;                 \
 183                         KEEP(*(__mcount_loc))                   \
 184                         KEEP_PATCHABLE                          \
 185                         __stop_mcount_loc = .;                  \
 186                         FTRACE_STUB_HACK                        \
 187                         ftrace_ops_list_func = arch_ftrace_ops_list_func;
 188 #else
 189 # ifdef CONFIG_FUNCTION_TRACER
 190 #  define MCOUNT_REC()  FTRACE_STUB_HACK                        \
 191                         ftrace_ops_list_func = arch_ftrace_ops_list_func;
 192 # else
 193 #  define MCOUNT_REC()
 194 # endif
 195 #endif
 196
 197 #define BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_)       \
 198         _BEGIN_##_label_ = .;                                           \
 199         KEEP(*(_sec_))                                                  \
 200         _END_##_label_ = .;
 201
 202 #define BOUNDED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_)      \
 203         _label_##_BEGIN_ = .;                                           \
 204         KEEP(*(_sec_))                                                  \
 205         _label_##_END_ = .;
 206
 207 #define BOUNDED_SECTION_BY(_sec_, _label_)                              \
 208         BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, __start, __stop)
 209
 210 #define BOUNDED_SECTION(_sec)    BOUNDED_SECTION_BY(_sec, _sec)
 211
 212 #define HEADERED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_, _HDR_) \
 213         _HDR_##_label_  = .;                                            \
 214         KEEP(*(.gnu.linkonce.##_sec_))                                  \
 215         BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_)
 216
 217 #define HEADERED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_, _HDR_) \
 218         _label_##_HDR_ = .;                                             \
 219         KEEP(*(.gnu.linkonce.##_sec_))                                  \
 220         BOUNDED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_)
 221
 222 #define HEADERED_SECTION_BY(_sec_, _label_)                             \
 223         HEADERED_SECTION_PRE_LABEL(_sec_, _label_, __start, __stop)
 224
 225 #define HEADERED_SECTION(_sec)   HEADERED_SECTION_BY(_sec, _sec)
 226
 227 #ifdef CONFIG_TRACE_BRANCH_PROFILING
 228 #define LIKELY_PROFILE()                                                \
 229         BOUNDED_SECTION_BY(_ftrace_annotated_branch, _annotated_branch_profile)
 230 #else
 231 #define LIKELY_PROFILE()
 232 #endif
 233
 234 #ifdef CONFIG_PROFILE_ALL_BRANCHES
 235 #define BRANCH_PROFILE()                                        \
 236         BOUNDED_SECTION_BY(_ftrace_branch, _branch_profile)
 237 #else
 238 #define BRANCH_PROFILE()
 239 #endif
 240
 241 #ifdef CONFIG_KPROBES
 242 #define KPROBE_BLACKLIST()                              \
 243         . = ALIGN(8);                                   \
 244         BOUNDED_SECTION(_kprobe_blacklist)
 245 #else
 246 #define KPROBE_BLACKLIST()
 247 #endif
 248
 249 #ifdef CONFIG_FUNCTION_ERROR_INJECTION
 250 #define ERROR_INJECT_WHITELIST()                        \
 251         STRUCT_ALIGN();                                 \
 252         BOUNDED_SECTION(_error_injection_whitelist)
 253 #else
 254 #define ERROR_INJECT_WHITELIST()
 255 #endif
 256
 257 #ifdef CONFIG_EVENT_TRACING
 258 #define FTRACE_EVENTS()                                                 \
 259         . = ALIGN(8);                                                   \
 260         BOUNDED_SECTION(_ftrace_events)                                 \
 261         BOUNDED_SECTION_BY(_ftrace_eval_map, _ftrace_eval_maps)
 262 #else
 263 #define FTRACE_EVENTS()
 264 #endif
 265
 266 #ifdef CONFIG_TRACING
 267 #define TRACE_PRINTKS()         BOUNDED_SECTION_BY(__trace_printk_fmt, ___trace_bprintk_fmt)
 268 #define TRACEPOINT_STR()        BOUNDED_SECTION_BY(__tracepoint_str, ___tracepoint_str)
 269 #else
 270 #define TRACE_PRINTKS()
 271 #define TRACEPOINT_STR()
 272 #endif
 273
 274 #ifdef CONFIG_FTRACE_SYSCALLS
 275 #define TRACE_SYSCALLS()                        \
 276         . = ALIGN(8);                           \
 277         BOUNDED_SECTION_BY(__syscalls_metadata, _syscalls_metadata)
 278 #else
 279 #define TRACE_SYSCALLS()
 280 #endif
 281
 282 #ifdef CONFIG_BPF_EVENTS
 283 #define BPF_RAW_TP() STRUCT_ALIGN();                            \
 284         BOUNDED_SECTION_BY(__bpf_raw_tp_map, __bpf_raw_tp)
 285 #else
 286 #define BPF_RAW_TP()
 287 #endif
 288
 289 #ifdef CONFIG_SERIAL_EARLYCON
 290 #define EARLYCON_TABLE()                                                \
 291         . = ALIGN(8);                                                   \
 292         BOUNDED_SECTION_POST_LABEL(__earlycon_table, __earlycon_table, , _end)
 293 #else
 294 #define EARLYCON_TABLE()
 295 #endif
 296
 297 #ifdef CONFIG_SECURITY
 298 #define LSM_TABLE()                                     \
 299         . = ALIGN(8);                                   \
 300         BOUNDED_SECTION_PRE_LABEL(.lsm_info.init, _lsm_info, __start, __end)
 301
 302 #define EARLY_LSM_TABLE()                                               \
 303         . = ALIGN(8);                                                   \
 304         BOUNDED_SECTION_PRE_LABEL(.early_lsm_info.init, _early_lsm_info, __start, __end)
 305 #else
 306 #define LSM_TABLE()
 307 #define EARLY_LSM_TABLE()
 308 #endif
 309
 310 #define ___OF_TABLE(cfg, name)  _OF_TABLE_##cfg(name)
 311 #define __OF_TABLE(cfg, name)   ___OF_TABLE(cfg, name)
 312 #define OF_TABLE(cfg, name)     __OF_TABLE(IS_ENABLED(cfg), name)
 313 #define _OF_TABLE_0(name)
 314 #define _OF_TABLE_1(name)                                               \
 315         . = ALIGN(8);                                                   \
 316         __##name##_of_table = .;                                        \
 317         KEEP(*(__##name##_of_table))                                    \
 318         KEEP(*(__##name##_of_table_end))
 319
 320 #define TIMER_OF_TABLES()       OF_TABLE(CONFIG_TIMER_OF, timer)
 321 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
 322 #define CLK_OF_TABLES()         OF_TABLE(CONFIG_COMMON_CLK, clk)
 323 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
 324 #define CPU_METHOD_OF_TABLES()  OF_TABLE(CONFIG_SMP, cpu_method)
 325 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method)
 326
 327 #ifdef CONFIG_ACPI
 328 #define ACPI_PROBE_TABLE(name)                                          \
 329         . = ALIGN(8);                                                   \
 330         BOUNDED_SECTION_POST_LABEL(__##name##_acpi_probe_table,         \
 331                                    __##name##_acpi_probe_table,, _end)
 332 #else
 333 #define ACPI_PROBE_TABLE(name)
 334 #endif
 335
 336 #ifdef CONFIG_THERMAL
 337 #define THERMAL_TABLE(name)                                             \
 338         . = ALIGN(8);                                                   \
 339         BOUNDED_SECTION_POST_LABEL(__##name##_thermal_table,            \
 340                                    __##name##_thermal_table,, _end)
 341 #else
 342 #define THERMAL_TABLE(name)
 343 #endif
 344
 345 #define KERNEL_DTB()                                                    \
 346         STRUCT_ALIGN();                                                 \
 347         __dtb_start = .;                                                \
 348         KEEP(*(.dtb.init.rodata))                                       \
 349         __dtb_end = .;
 350
 351 /*
 352  * .data section
 353  */
 354 #define DATA_DATA                                                       \
 355         *(.xiptext)                                                     \
 356         *(DATA_MAIN)                                                    \
 357         *(.data..decrypted)                                             \
 358         *(.ref.data)                                                    \
 359         *(.data..shared_aligned) /* percpu related */                   \
 360         *(.data..unlikely)                                              \
 361         __start_once = .;                                               \
 362         *(.data..once)                                                  \
 363         __end_once = .;                                                 \
 364         STRUCT_ALIGN();                                                 \
 365         *(__tracepoints)                                                \
 366         /* implement dynamic printk debug */                            \
 367         . = ALIGN(8);                                                   \
 368         BOUNDED_SECTION_BY(__dyndbg_classes, ___dyndbg_classes)         \
 369         BOUNDED_SECTION_BY(__dyndbg, ___dyndbg)                         \
 370         CODETAG_SECTIONS()                                              \
 371         LIKELY_PROFILE()                                                \
 372         BRANCH_PROFILE()                                                \
 373         TRACE_PRINTKS()                                                 \
 374         BPF_RAW_TP()                                                    \
 375         TRACEPOINT_STR()                                                \
 376         KUNIT_TABLE()
 377
 378 /*
 379  * Data section helpers
 380  */
 381 #define NOSAVE_DATA                                                     \
 382         . = ALIGN(PAGE_SIZE);                                           \
 383         __nosave_begin = .;                                             \
 384         *(.data..nosave)                                                \
 385         . = ALIGN(PAGE_SIZE);                                           \
 386         __nosave_end = .;
 387
 388 #define PAGE_ALIGNED_DATA(page_align)                                   \
 389         . = ALIGN(page_align);                                          \
 390         *(.data..page_aligned)                                          \
 391         . = ALIGN(page_align);
 392
 393 #define READ_MOSTLY_DATA(align)                                         \
 394         . = ALIGN(align);                                               \
 395         *(.data..read_mostly)                                           \
 396         . = ALIGN(align);
 397
 398 #define CACHELINE_ALIGNED_DATA(align)                                   \
 399         . = ALIGN(align);                                               \
 400         *(.data..cacheline_aligned)
 401
 402 #define INIT_TASK_DATA(align)                                           \
 403         . = ALIGN(align);                                               \
 404         __start_init_stack = .;                                         \
 405         init_thread_union = .;                                          \
 406         init_stack = .;                                                 \
 407         KEEP(*(.data..init_task))                                       \
 408         KEEP(*(.data..init_thread_info))                                \
 409         . = __start_init_stack + THREAD_SIZE;                           \
 410         __end_init_stack = .;
 411
 412 #define JUMP_TABLE_DATA                                                 \
 413         . = ALIGN(8);                                                   \
 414         BOUNDED_SECTION_BY(__jump_table, ___jump_table)
 415
 416 #ifdef CONFIG_HAVE_STATIC_CALL_INLINE
 417 #define STATIC_CALL_DATA                                                \
 418         . = ALIGN(8);                                                   \
 419         BOUNDED_SECTION_BY(.static_call_sites, _static_call_sites)      \
 420         BOUNDED_SECTION_BY(.static_call_tramp_key, _static_call_tramp_key)
 421 #else
 422 #define STATIC_CALL_DATA
 423 #endif
 424
 425 /*
 426  * Allow architectures to handle ro_after_init data on their
 427  * own by defining an empty RO_AFTER_INIT_DATA.
 428  */
 429 #ifndef RO_AFTER_INIT_DATA
 430 #define RO_AFTER_INIT_DATA                                              \
 431         . = ALIGN(8);                                                   \
 432         __start_ro_after_init = .;                                      \
 433         *(.data..ro_after_init)                                         \
 434         JUMP_TABLE_DATA                                                 \
 435         STATIC_CALL_DATA                                                \
 436         __end_ro_after_init = .;
 437 #endif
 438
 439 /*
 440  * .kcfi_traps contains a list KCFI trap locations.
 441  */
 442 #ifndef KCFI_TRAPS
 443 #ifdef CONFIG_ARCH_USES_CFI_TRAPS
 444 #define KCFI_TRAPS                                                      \
 445         __kcfi_traps : AT(ADDR(__kcfi_traps) - LOAD_OFFSET) {           \
 446                 BOUNDED_SECTION_BY(.kcfi_traps, ___kcfi_traps)          \
 447         }
 448 #else
 449 #define KCFI_TRAPS
 450 #endif
 451 #endif
 452
 453 /*
 454  * Read only Data
 455  */
 456 #define RO_DATA(align)                                                  \
 457         . = ALIGN((align));                                             \
 458         .rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {           \
 459                 __start_rodata = .;                                     \
 460                 *(.rodata) *(.rodata.*)                                 \
 461                 SCHED_DATA                                              \
 462                 RO_AFTER_INIT_DATA      /* Read only after init */      \
 463                 . = ALIGN(8);                                           \
 464                 BOUNDED_SECTION_BY(__tracepoints_ptrs, ___tracepoints_ptrs) \
 465                 *(__tracepoints_strings)/* Tracepoints: strings */      \
 466         }                                                               \
 467                                                                         \
 468         .rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {          \
 469                 *(.rodata1)                                             \
 470         }                                                               \
 471                                                                         \
 472         /* PCI quirks */                                                \
 473         .pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {        \
 474                 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_early,  _pci_fixups_early,  __start, __end) \
 475                 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_header, _pci_fixups_header, __start, __end) \
 476                 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_final,  _pci_fixups_final,  __start, __end) \
 477                 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_enable, _pci_fixups_enable, __start, __end) \
 478                 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_resume, _pci_fixups_resume, __start, __end) \
 479                 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_suspend, _pci_fixups_suspend, __start, __end) \
 480                 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_resume_early, _pci_fixups_resume_early, __start, __end) \
 481                 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_suspend_late, _pci_fixups_suspend_late, __start, __end) \
 482         }                                                               \
 483                                                                         \
 484         FW_LOADER_BUILT_IN_DATA                                         \
 485         TRACEDATA                                                       \
 486                                                                         \
 487         PRINTK_INDEX                                                    \
 488                                                                         \
 489         /* Kernel symbol table: Normal symbols */                       \
 490         __ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {         \
 491                 __start___ksymtab = .;                                  \
 492                 KEEP(*(SORT(___ksymtab+*)))                             \
 493                 __stop___ksymtab = .;                                   \
 494         }                                                               \
 495                                                                         \
 496         /* Kernel symbol table: GPL-only symbols */                     \
 497         __ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {     \
 498                 __start___ksymtab_gpl = .;                              \
 499                 KEEP(*(SORT(___ksymtab_gpl+*)))                         \
 500                 __stop___ksymtab_gpl = .;                               \
 501         }                                                               \
 502                                                                         \
 503         /* Kernel symbol table: Normal symbols */                       \
 504         __kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {         \
 505                 __start___kcrctab = .;                                  \
 506                 KEEP(*(SORT(___kcrctab+*)))                             \
 507                 __stop___kcrctab = .;                                   \
 508         }                                                               \
 509                                                                         \
 510         /* Kernel symbol table: GPL-only symbols */                     \
 511         __kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {     \
 512                 __start___kcrctab_gpl = .;                              \
 513                 KEEP(*(SORT(___kcrctab_gpl+*)))                         \
 514                 __stop___kcrctab_gpl = .;                               \
 515         }                                                               \
 516                                                                         \
 517         /* Kernel symbol table: strings */                              \
 518         __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
 519                 *(__ksymtab_strings)                                    \
 520         }                                                               \
 521                                                                         \
 522         /* __*init sections */                                          \
 523         __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {         \
 524                 *(.ref.rodata)                                          \
 525         }                                                               \
 526                                                                         \
 527         /* Built-in module parameters. */                               \
 528         __param : AT(ADDR(__param) - LOAD_OFFSET) {                     \
 529                 BOUNDED_SECTION_BY(__param, ___param)                   \
 530         }                                                               \
 531                                                                         \
 532         /* Built-in module versions. */                                 \
 533         __modver : AT(ADDR(__modver) - LOAD_OFFSET) {                   \
 534                 BOUNDED_SECTION_BY(__modver, ___modver)                 \
 535         }                                                               \
 536                                                                         \
 537         KCFI_TRAPS                                                      \
 538                                                                         \
 539         RO_EXCEPTION_TABLE                                              \
 540         NOTES                                                           \
 541         BTF                                                             \
 542                                                                         \
 543         . = ALIGN((align));                                             \
 544         __end_rodata = .;
 545
 546
 547 /*
 548  * Non-instrumentable text section
 549  */
 550 #define NOINSTR_TEXT                                                    \
 551                 ALIGN_FUNCTION();                                       \
 552                 __noinstr_text_start = .;                               \
 553                 *(.noinstr.text)                                        \
 554                 __cpuidle_text_start = .;                               \
 555                 *(.cpuidle.text)                                        \
 556                 __cpuidle_text_end = .;                                 \
 557                 __noinstr_text_end = .;
 558
 559 #define TEXT_SPLIT                                                      \
 560                 __split_text_start = .;                                 \
 561                 *(.text.split .text.split.[0-9a-zA-Z_]*)                \
 562                 __split_text_end = .;
 563
 564 #define TEXT_UNLIKELY                                                   \
 565                 __unlikely_text_start = .;                              \
 566                 *(.text.unlikely .text.unlikely.*)                      \
 567                 __unlikely_text_end = .;
 568
 569 #define TEXT_HOT                                                        \
 570                 __hot_text_start = .;                                   \
 571                 *(.text.hot .text.hot.*)                                \
 572                 __hot_text_end = .;
 573
 574 /*
 575  * .text section. Map to function alignment to avoid address changes
 576  * during second ld run in second ld pass when generating System.map
 577  *
 578  * TEXT_MAIN here will match symbols with a fixed pattern (for example,
 579  * .text.hot or .text.unlikely) if dead code elimination or
 580  * function-section is enabled. Match these symbols first before
 581  * TEXT_MAIN to ensure they are grouped together.
 582  *
 583  * Also placing .text.hot section at the beginning of a page, this
 584  * would help the TLB performance.
 585  */
 586 #define TEXT_TEXT                                                       \
 587                 ALIGN_FUNCTION();                                       \
 588                 *(.text.asan.* .text.tsan.*)                            \
 589                 *(.text.unknown .text.unknown.*)                        \
 590                 TEXT_SPLIT                                              \
 591                 TEXT_UNLIKELY                                           \
 592                 . = ALIGN(PAGE_SIZE);                                   \
 593                 TEXT_HOT                                                \
 594                 *(TEXT_MAIN .text.fixup)                                \
 595                 NOINSTR_TEXT                                            \
 596                 *(.ref.text)
 597
 598 /* sched.text is aling to function alignment to secure we have same
 599  * address even at second ld pass when generating System.map */
 600 #define SCHED_TEXT                                                      \
 601                 ALIGN_FUNCTION();                                       \
 602                 __sched_text_start = .;                                 \
 603                 *(.sched.text)                                          \
 604                 __sched_text_end = .;
 605
 606 /* spinlock.text is aling to function alignment to secure we have same
 607  * address even at second ld pass when generating System.map */
 608 #define LOCK_TEXT                                                       \
 609                 ALIGN_FUNCTION();                                       \
 610                 __lock_text_start = .;                                  \
 611                 *(.spinlock.text)                                       \
 612                 __lock_text_end = .;
 613
 614 #define KPROBES_TEXT                                                    \
 615                 ALIGN_FUNCTION();                                       \
 616                 __kprobes_text_start = .;                               \
 617                 *(.kprobes.text)                                        \
 618                 __kprobes_text_end = .;
 619
 620 #define ENTRY_TEXT                                                      \
 621                 ALIGN_FUNCTION();                                       \
 622                 __entry_text_start = .;                                 \
 623                 *(.entry.text)                                          \
 624                 __entry_text_end = .;
 625
 626 #define IRQENTRY_TEXT                                                   \
 627                 ALIGN_FUNCTION();                                       \
 628                 __irqentry_text_start = .;                              \
 629                 *(.irqentry.text)                                       \
 630                 __irqentry_text_end = .;
 631
 632 #define SOFTIRQENTRY_TEXT                                               \
 633                 ALIGN_FUNCTION();                                       \
 634                 __softirqentry_text_start = .;                          \
 635                 *(.softirqentry.text)                                   \
 636                 __softirqentry_text_end = .;
 637
 638 #define STATIC_CALL_TEXT                                                \
 639                 ALIGN_FUNCTION();                                       \
 640                 __static_call_text_start = .;                           \
 641                 *(.static_call.text)                                    \
 642                 __static_call_text_end = .;
 643
 644 /* Section used for early init (in .S files) */
 645 #define HEAD_TEXT  KEEP(*(.head.text))
 646
 647 #define HEAD_TEXT_SECTION                                                       \
 648         .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {               \
 649                 HEAD_TEXT                                               \
 650         }
 651
 652 /*
 653  * Exception table
 654  */
 655 #define EXCEPTION_TABLE(align)                                          \
 656         . = ALIGN(align);                                               \
 657         __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {               \
 658                 BOUNDED_SECTION_BY(__ex_table, ___ex_table)             \
 659         }
 660
 661 /*
 662  * .BTF
 663  */
 664 #ifdef CONFIG_DEBUG_INFO_BTF
 665 #define BTF                                                             \
 666         .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) {                           \
 667                 BOUNDED_SECTION_BY(.BTF, _BTF)                          \
 668         }                                                               \
 669         . = ALIGN(4);                                                   \
 670         .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) {                   \
 671                 *(.BTF_ids)                                             \
 672         }
 673 #else
 674 #define BTF
 675 #endif
 676
 677 /*
 678  * Init task
 679  */
 680 #define INIT_TASK_DATA_SECTION(align)                                   \
 681         . = ALIGN(align);                                               \
 682         .data..init_task :  AT(ADDR(.data..init_task) - LOAD_OFFSET) {  \
 683                 INIT_TASK_DATA(align)                                   \
 684         }
 685
 686 #ifdef CONFIG_CONSTRUCTORS
 687 #define KERNEL_CTORS()  . = ALIGN(8);                      \
 688                         __ctors_start = .;                 \
 689                         KEEP(*(SORT(.ctors.*)))            \
 690                         KEEP(*(.ctors))                    \
 691                         KEEP(*(SORT(.init_array.*)))       \
 692                         KEEP(*(.init_array))               \
 693                         __ctors_end = .;
 694 #else
 695 #define KERNEL_CTORS()
 696 #endif
 697
 698 /* init and exit section handling */
 699 #define INIT_DATA                                                       \
 700         KEEP(*(SORT(___kentry+*)))                                      \
 701         *(.init.data .init.data.*)                                      \
 702         KERNEL_CTORS()                                                  \
 703         MCOUNT_REC()                                                    \
 704         *(.init.rodata .init.rodata.*)                                  \
 705         FTRACE_EVENTS()                                                 \
 706         TRACE_SYSCALLS()                                                \
 707         KPROBE_BLACKLIST()                                              \
 708         ERROR_INJECT_WHITELIST()                                        \
 709         CLK_OF_TABLES()                                                 \
 710         RESERVEDMEM_OF_TABLES()                                         \
 711         TIMER_OF_TABLES()                                               \
 712         CPU_METHOD_OF_TABLES()                                          \
 713         CPUIDLE_METHOD_OF_TABLES()                                      \
 714         KERNEL_DTB()                                                    \
 715         IRQCHIP_OF_MATCH_TABLE()                                        \
 716         ACPI_PROBE_TABLE(irqchip)                                       \
 717         ACPI_PROBE_TABLE(timer)                                         \
 718         THERMAL_TABLE(governor)                                         \
 719         EARLYCON_TABLE()                                                \
 720         LSM_TABLE()                                                     \
 721         EARLY_LSM_TABLE()                                               \
 722         KUNIT_INIT_TABLE()
 723
 724 #define INIT_TEXT                                                       \
 725         *(.init.text .init.text.*)                                      \
 726         *(.text.startup)
 727
 728 #define EXIT_DATA                                                       \
 729         *(.exit.data .exit.data.*)                                      \
 730         *(.fini_array .fini_array.*)                                    \
 731         *(.dtors .dtors.*)                                              \
 732
 733 #define EXIT_TEXT                                                       \
 734         *(.exit.text)                                                   \
 735         *(.text.exit)                                                   \
 736
 737 #define EXIT_CALL                                                       \
 738         *(.exitcall.exit)
 739
 740 /*
 741  * bss (Block Started by Symbol) - uninitialized data
 742  * zeroed during startup
 743  */
 744 #define SBSS(sbss_align)                                                \
 745         . = ALIGN(sbss_align);                                          \
 746         .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {                         \
 747                 *(.dynsbss)                                             \
 748                 *(SBSS_MAIN)                                            \
 749                 *(.scommon)                                             \
 750         }
 751
 752 /*
 753  * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
 754  * sections to the front of bss.
 755  */
 756 #ifndef BSS_FIRST_SECTIONS
 757 #define BSS_FIRST_SECTIONS
 758 #endif
 759
 760 #define BSS(bss_align)                                                  \
 761         . = ALIGN(bss_align);                                           \
 762         .bss : AT(ADDR(.bss) - LOAD_OFFSET) {                           \
 763                 BSS_FIRST_SECTIONS                                      \
 764                 . = ALIGN(PAGE_SIZE);                                   \
 765                 *(.bss..page_aligned)                                   \
 766                 . = ALIGN(PAGE_SIZE);                                   \
 767                 *(.dynbss)                                              \
 768                 *(BSS_MAIN)                                             \
 769                 *(COMMON)                                               \
 770         }
 771
 772 /*
 773  * DWARF debug sections.
 774  * Symbols in the DWARF debugging sections are relative to
 775  * the beginning of the section so we begin them at 0.
 776  */
 777 #define DWARF_DEBUG                                                     \
 778                 /* DWARF 1 */                                           \
 779                 .debug          0 : { *(.debug) }                       \
 780                 .line           0 : { *(.line) }                        \
 781                 /* GNU DWARF 1 extensions */                            \
 782                 .debug_srcinfo  0 : { *(.debug_srcinfo) }               \
 783                 .debug_sfnames  0 : { *(.debug_sfnames) }               \
 784                 /* DWARF 1.1 and DWARF 2 */                             \
 785                 .debug_aranges  0 : { *(.debug_aranges) }               \
 786                 .debug_pubnames 0 : { *(.debug_pubnames) }              \
 787                 /* DWARF 2 */                                           \
 788                 .debug_info     0 : { *(.debug_info                     \
 789                                 .gnu.linkonce.wi.*) }                   \
 790                 .debug_abbrev   0 : { *(.debug_abbrev) }                \
 791                 .debug_line     0 : { *(.debug_line) }                  \
 792                 .debug_frame    0 : { *(.debug_frame) }                 \
 793                 .debug_str      0 : { *(.debug_str) }                   \
 794                 .debug_loc      0 : { *(.debug_loc) }                   \
 795                 .debug_macinfo  0 : { *(.debug_macinfo) }               \
 796                 .debug_pubtypes 0 : { *(.debug_pubtypes) }              \
 797                 /* DWARF 3 */                                           \
 798                 .debug_ranges   0 : { *(.debug_ranges) }                \
 799                 /* SGI/MIPS DWARF 2 extensions */                       \
 800                 .debug_weaknames 0 : { *(.debug_weaknames) }            \
 801                 .debug_funcnames 0 : { *(.debug_funcnames) }            \
 802                 .debug_typenames 0 : { *(.debug_typenames) }            \
 803                 .debug_varnames  0 : { *(.debug_varnames) }             \
 804                 /* GNU DWARF 2 extensions */                            \
 805                 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) }      \
 806                 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) }      \
 807                 /* DWARF 4 */                                           \
 808                 .debug_types    0 : { *(.debug_types) }                 \
 809                 /* DWARF 5 */                                           \
 810                 .debug_addr     0 : { *(.debug_addr) }                  \
 811                 .debug_line_str 0 : { *(.debug_line_str) }              \
 812                 .debug_loclists 0 : { *(.debug_loclists) }              \
 813                 .debug_macro    0 : { *(.debug_macro) }                 \
 814                 .debug_names    0 : { *(.debug_names) }                 \
 815                 .debug_rnglists 0 : { *(.debug_rnglists) }              \
 816                 .debug_str_offsets      0 : { *(.debug_str_offsets) }
 817
 818 /* Stabs debugging sections. */
 819 #define STABS_DEBUG                                                     \
 820                 .stab 0 : { *(.stab) }                                  \
 821                 .stabstr 0 : { *(.stabstr) }                            \
 822                 .stab.excl 0 : { *(.stab.excl) }                        \
 823                 .stab.exclstr 0 : { *(.stab.exclstr) }                  \
 824                 .stab.index 0 : { *(.stab.index) }                      \
 825                 .stab.indexstr 0 : { *(.stab.indexstr) }
 826
 827 /* Required sections not related to debugging. */
 828 #define ELF_DETAILS                                                     \
 829                 .comment 0 : { *(.comment) }                            \
 830                 .symtab 0 : { *(.symtab) }                              \
 831                 .strtab 0 : { *(.strtab) }                              \
 832                 .shstrtab 0 : { *(.shstrtab) }
 833
 834 #ifdef CONFIG_GENERIC_BUG
 835 #define BUG_TABLE                                                       \
 836         . = ALIGN(8);                                                   \
 837         __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {             \
 838                 BOUNDED_SECTION_BY(__bug_table, ___bug_table)           \
 839         }
 840 #else
 841 #define BUG_TABLE
 842 #endif
 843
 844 #ifdef CONFIG_UNWINDER_ORC
 845 #define ORC_UNWIND_TABLE                                                \
 846         .orc_header : AT(ADDR(.orc_header) - LOAD_OFFSET) {             \
 847                 BOUNDED_SECTION_BY(.orc_header, _orc_header)            \
 848         }                                                               \
 849         . = ALIGN(4);                                                   \
 850         .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) {       \
 851                 BOUNDED_SECTION_BY(.orc_unwind_ip, _orc_unwind_ip)      \
 852         }                                                               \
 853         . = ALIGN(2);                                                   \
 854         .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) {             \
 855                 BOUNDED_SECTION_BY(.orc_unwind, _orc_unwind)            \
 856         }                                                               \
 857         text_size = _etext - _stext;                                    \
 858         . = ALIGN(4);                                                   \
 859         .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) {             \
 860                 orc_lookup = .;                                         \
 861                 . += (((text_size + LOOKUP_BLOCK_SIZE - 1) /            \
 862                         LOOKUP_BLOCK_SIZE) + 1) * 4;                    \
 863                 orc_lookup_end = .;                                     \
 864         }
 865 #else
 866 #define ORC_UNWIND_TABLE
 867 #endif
 868
 869 /* Built-in firmware blobs */
 870 #ifdef CONFIG_FW_LOADER
 871 #define FW_LOADER_BUILT_IN_DATA                                         \
 872         .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) {    \
 873                 BOUNDED_SECTION_PRE_LABEL(.builtin_fw, _builtin_fw, __start, __end) \
 874         }
 875 #else
 876 #define FW_LOADER_BUILT_IN_DATA
 877 #endif
 878
 879 #ifdef CONFIG_PM_TRACE
 880 #define TRACEDATA                                                       \
 881         . = ALIGN(4);                                                   \
 882         .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {               \
 883                 BOUNDED_SECTION_POST_LABEL(.tracedata, __tracedata, _start, _end) \
 884         }
 885 #else
 886 #define TRACEDATA
 887 #endif
 888
 889 #ifdef CONFIG_PRINTK_INDEX
 890 #define PRINTK_INDEX                                                    \
 891         .printk_index : AT(ADDR(.printk_index) - LOAD_OFFSET) {         \
 892                 BOUNDED_SECTION_BY(.printk_index, _printk_index)        \
 893         }
 894 #else
 895 #define PRINTK_INDEX
 896 #endif
 897
 898 /*
 899  * Discard .note.GNU-stack, which is emitted as PROGBITS by the compiler.
 900  * Otherwise, the type of .notes section would become PROGBITS instead of NOTES.
 901  *
 902  * Also, discard .note.gnu.property, otherwise it forces the notes section to
 903  * be 8-byte aligned which causes alignment mismatches with the kernel's custom
 904  * 4-byte aligned notes.
 905  */
 906 #define NOTES                                                           \
 907         /DISCARD/ : {                                                   \
 908                 *(.note.GNU-stack)                                      \
 909                 *(.note.gnu.property)                                   \
 910         }                                                               \
 911         .notes : AT(ADDR(.notes) - LOAD_OFFSET) {                       \
 912                 BOUNDED_SECTION_BY(.note.*, _notes)                     \
 913         } NOTES_HEADERS                                                 \
 914         NOTES_HEADERS_RESTORE
 915
 916 #define INIT_SETUP(initsetup_align)                                     \
 917                 . = ALIGN(initsetup_align);                             \
 918                 BOUNDED_SECTION_POST_LABEL(.init.setup, __setup, _start, _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         BOUNDED_SECTION_POST_LABEL(.con_initcall.init, __con_initcall, _start, _end)
 941
 942 #define NAMED_SECTION(name) \
 943         . = ALIGN(8); \
 944         name : AT(ADDR(name) - LOAD_OFFSET) \
 945         { BOUNDED_SECTION_PRE_LABEL(name, name, __start_, __stop_) }
 946
 947 #define RUNTIME_CONST(t,x) NAMED_SECTION(runtime_##t##_##x)
 948
 949 #define RUNTIME_CONST_VARIABLES                                         \
 950                 RUNTIME_CONST(shift, d_hash_shift)                      \
 951                 RUNTIME_CONST(ptr, dentry_hashtable)
 952
 953 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */
 954 #define KUNIT_TABLE()                                                   \
 955                 . = ALIGN(8);                                           \
 956                 BOUNDED_SECTION_POST_LABEL(.kunit_test_suites, __kunit_suites, _start, _end)
 957
 958 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */
 959 #define KUNIT_INIT_TABLE()                                              \
 960                 . = ALIGN(8);                                           \
 961                 BOUNDED_SECTION_POST_LABEL(.kunit_init_test_suites, \
 962                                 __kunit_init_suites, _start, _end)
 963
 964 #ifdef CONFIG_BLK_DEV_INITRD
 965 #define INIT_RAM_FS                                                     \
 966         . = ALIGN(4);                                                   \
 967         __initramfs_start = .;                                          \
 968         KEEP(*(.init.ramfs))                                            \
 969         . = ALIGN(8);                                                   \
 970         KEEP(*(.init.ramfs.info))
 971 #else
 972 #define INIT_RAM_FS
 973 #endif
 974
 975 /*
 976  * Memory encryption operates on a page basis. Since we need to clear
 977  * the memory encryption mask for this section, it needs to be aligned
 978  * on a page boundary and be a page-size multiple in length.
 979  *
 980  * Note: We use a separate section so that only this section gets
 981  * decrypted to avoid exposing more than we wish.
 982  */
 983 #ifdef CONFIG_AMD_MEM_ENCRYPT
 984 #define PERCPU_DECRYPTED_SECTION                                        \
 985         . = ALIGN(PAGE_SIZE);                                           \
 986         *(.data..percpu..decrypted)                                     \
 987         . = ALIGN(PAGE_SIZE);
 988 #else
 989 #define PERCPU_DECRYPTED_SECTION
 990 #endif
 991
 992
 993 /*
 994  * Default discarded sections.
 995  *
 996  * Some archs want to discard exit text/data at runtime rather than
 997  * link time due to cross-section references such as alt instructions,
 998  * bug table, eh_frame, etc.  DISCARDS must be the last of output
 999  * section definitions so that such archs put those in earlier section
1000  * definitions.
1001  */
1002 #ifdef RUNTIME_DISCARD_EXIT
1003 #define EXIT_DISCARDS
1004 #else
1005 #define EXIT_DISCARDS                                                   \
1006         EXIT_TEXT                                                       \
1007         EXIT_DATA
1008 #endif
1009
1010 /*
1011  * Clang's -fprofile-arcs, -fsanitize=kernel-address, and
1012  * -fsanitize=thread produce unwanted sections (.eh_frame
1013  * and .init_array.*), but CONFIG_CONSTRUCTORS wants to
1014  * keep any .init_array.* sections.
1015  * https://llvm.org/pr46478
1016  */
1017 #ifdef CONFIG_UNWIND_TABLES
1018 #define DISCARD_EH_FRAME
1019 #else
1020 #define DISCARD_EH_FRAME        *(.eh_frame)
1021 #endif
1022 #if defined(CONFIG_GCOV_KERNEL) || defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN)
1023 # ifdef CONFIG_CONSTRUCTORS
1024 #  define SANITIZER_DISCARDS                                            \
1025         DISCARD_EH_FRAME
1026 # else
1027 #  define SANITIZER_DISCARDS                                            \
1028         *(.init_array) *(.init_array.*)                                 \
1029         DISCARD_EH_FRAME
1030 # endif
1031 #else
1032 # define SANITIZER_DISCARDS
1033 #endif
1034
1035 #define COMMON_DISCARDS                                                 \
1036         SANITIZER_DISCARDS                                              \
1037         PATCHABLE_DISCARDS                                              \
1038         *(.discard)                                                     \
1039         *(.discard.*)                                                   \
1040         *(.export_symbol)                                               \
1041         *(.modinfo)                                                     \
1042         /* ld.bfd warns about .gnu.version* even when not emitted */    \
1043         *(.gnu.version*)                                                \
1044
1045 #define DISCARDS                                                        \
1046         /DISCARD/ : {                                                   \
1047         EXIT_DISCARDS                                                   \
1048         EXIT_CALL                                                       \
1049         COMMON_DISCARDS                                                 \
1050         }
1051
1052 /**
1053  * PERCPU_INPUT - the percpu input sections
1054  * @cacheline: cacheline size
1055  *
1056  * The core percpu section names and core symbols which do not rely
1057  * directly upon load addresses.
1058  *
1059  * @cacheline is used to align subsections to avoid false cacheline
1060  * sharing between subsections for different purposes.
1061  */
1062 #define PERCPU_INPUT(cacheline)                                         \
1063         __per_cpu_start = .;                                            \
1064         *(.data..percpu..first)                                         \
1065         . = ALIGN(PAGE_SIZE);                                           \
1066         *(.data..percpu..page_aligned)                                  \
1067         . = ALIGN(cacheline);                                           \
1068         *(.data..percpu..read_mostly)                                   \
1069         . = ALIGN(cacheline);                                           \
1070         *(.data..percpu)                                                \
1071         *(.data..percpu..shared_aligned)                                \
1072         PERCPU_DECRYPTED_SECTION                                        \
1073         __per_cpu_end = .;
1074
1075 /**
1076  * PERCPU_VADDR - define output section for percpu area
1077  * @cacheline: cacheline size
1078  * @vaddr: explicit base address (optional)
1079  * @phdr: destination PHDR (optional)
1080  *
1081  * Macro which expands to output section for percpu area.
1082  *
1083  * @cacheline is used to align subsections to avoid false cacheline
1084  * sharing between subsections for different purposes.
1085  *
1086  * If @vaddr is not blank, it specifies explicit base address and all
1087  * percpu symbols will be offset from the given address.  If blank,
1088  * @vaddr always equals @laddr + LOAD_OFFSET.
1089  *
1090  * @phdr defines the output PHDR to use if not blank.  Be warned that
1091  * output PHDR is sticky.  If @phdr is specified, the next output
1092  * section in the linker script will go there too.  @phdr should have
1093  * a leading colon.
1094  *
1095  * Note that this macros defines __per_cpu_load as an absolute symbol.
1096  * If there is no need to put the percpu section at a predetermined
1097  * address, use PERCPU_SECTION.
1098  */
1099 #define PERCPU_VADDR(cacheline, vaddr, phdr)                            \
1100         __per_cpu_load = .;                                             \
1101         .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) {        \
1102                 PERCPU_INPUT(cacheline)                                 \
1103         } phdr                                                          \
1104         . = __per_cpu_load + SIZEOF(.data..percpu);
1105
1106 /**
1107  * PERCPU_SECTION - define output section for percpu area, simple version
1108  * @cacheline: cacheline size
1109  *
1110  * Align to PAGE_SIZE and outputs output section for percpu area.  This
1111  * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
1112  * __per_cpu_start will be identical.
1113  *
1114  * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
1115  * except that __per_cpu_load is defined as a relative symbol against
1116  * .data..percpu which is required for relocatable x86_32 configuration.
1117  */
1118 #define PERCPU_SECTION(cacheline)                                       \
1119         . = ALIGN(PAGE_SIZE);                                           \
1120         .data..percpu   : AT(ADDR(.data..percpu) - LOAD_OFFSET) {       \
1121                 __per_cpu_load = .;                                     \
1122                 PERCPU_INPUT(cacheline)                                 \
1123         }
1124
1125
1126 /*
1127  * Definition of the high level *_SECTION macros
1128  * They will fit only a subset of the architectures
1129  */
1130
1131
1132 /*
1133  * Writeable data.
1134  * All sections are combined in a single .data section.
1135  * The sections following CONSTRUCTORS are arranged so their
1136  * typical alignment matches.
1137  * A cacheline is typical/always less than a PAGE_SIZE so
1138  * the sections that has this restriction (or similar)
1139  * is located before the ones requiring PAGE_SIZE alignment.
1140  * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
1141  * matches the requirement of PAGE_ALIGNED_DATA.
1142  *
1143  * use 0 as page_align if page_aligned data is not used */
1144 #define RW_DATA(cacheline, pagealigned, inittask)                       \
1145         . = ALIGN(PAGE_SIZE);                                           \
1146         .data : AT(ADDR(.data) - LOAD_OFFSET) {                         \
1147                 INIT_TASK_DATA(inittask)                                \
1148                 NOSAVE_DATA                                             \
1149                 PAGE_ALIGNED_DATA(pagealigned)                          \
1150                 CACHELINE_ALIGNED_DATA(cacheline)                       \
1151                 READ_MOSTLY_DATA(cacheline)                             \
1152                 DATA_DATA                                               \
1153                 CONSTRUCTORS                                            \
1154         }                                                               \
1155         BUG_TABLE                                                       \
1156
1157 #define INIT_TEXT_SECTION(inittext_align)                               \
1158         . = ALIGN(inittext_align);                                      \
1159         .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {               \
1160                 _sinittext = .;                                         \
1161                 INIT_TEXT                                               \
1162                 _einittext = .;                                         \
1163         }
1164
1165 #define INIT_DATA_SECTION(initsetup_align)                              \
1166         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {               \
1167                 INIT_DATA                                               \
1168                 INIT_SETUP(initsetup_align)                             \
1169                 INIT_CALLS                                              \
1170                 CON_INITCALL                                            \
1171                 INIT_RAM_FS                                             \
1172         }
1173
1174 #define BSS_SECTION(sbss_align, bss_align, stop_align)                  \
1175         . = ALIGN(sbss_align);                                          \
1176         __bss_start = .;                                                \
1177         SBSS(sbss_align)                                                \
1178         BSS(bss_align)                                                  \
1179         . = ALIGN(stop_align);                                          \
1180         __bss_stop = .;