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