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
 346 #define READ_MOSTLY_DATA(align)                                         \
 347         . = ALIGN(align);                                               \
 348         *(.data..read_mostly)                                           \
 349         . = ALIGN(align);
 350
 351 #define CACHELINE_ALIGNED_DATA(align)                                   \
 352         . = ALIGN(align);                                               \
 353         *(.data..cacheline_aligned)
 354
 355 #define INIT_TASK_DATA(align)                                           \
 356         . = ALIGN(align);                                               \
 357         __start_init_task = .;                                          \
 358         init_thread_union = .;                                          \
 359         init_stack = .;                                                 \
 360         KEEP(*(.data..init_task))                                       \
 361         KEEP(*(.data..init_thread_info))                                \
 362         . = __start_init_task + THREAD_SIZE;                            \
 363         __end_init_task = .;
 364
 365 #define JUMP_TABLE_DATA                                                 \
 366         . = ALIGN(8);                                                   \
 367         __start___jump_table = .;                                       \
 368         KEEP(*(__jump_table))                                           \
 369         __stop___jump_table = .;
 370
 371 /*
 372  * Allow architectures to handle ro_after_init data on their
 373  * own by defining an empty RO_AFTER_INIT_DATA.
 374  */
 375 #ifndef RO_AFTER_INIT_DATA
 376 #define RO_AFTER_INIT_DATA                                              \
 377         __start_ro_after_init = .;                                      \
 378         *(.data..ro_after_init)                                         \
 379         JUMP_TABLE_DATA                                                 \
 380         __end_ro_after_init = .;
 381 #endif
 382
 383 /*
 384  * Read only Data
 385  */
 386 #define RO_DATA(align)                                                  \
 387         . = ALIGN((align));                                             \
 388         .rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {           \
 389                 __start_rodata = .;                                     \
 390                 *(.rodata) *(.rodata.*)                                 \
 391                 RO_AFTER_INIT_DATA      /* Read only after init */      \
 392                 . = ALIGN(8);                                           \
 393                 __start___tracepoints_ptrs = .;                         \
 394                 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \
 395                 __stop___tracepoints_ptrs = .;                          \
 396                 *(__tracepoints_strings)/* Tracepoints: strings */      \
 397         }                                                               \
 398                                                                         \
 399         .rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {          \
 400                 *(.rodata1)                                             \
 401         }                                                               \
 402                                                                         \
 403         /* PCI quirks */                                                \
 404         .pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {        \
 405                 __start_pci_fixups_early = .;                           \
 406                 KEEP(*(.pci_fixup_early))                               \
 407                 __end_pci_fixups_early = .;                             \
 408                 __start_pci_fixups_header = .;                          \
 409                 KEEP(*(.pci_fixup_header))                              \
 410                 __end_pci_fixups_header = .;                            \
 411                 __start_pci_fixups_final = .;                           \
 412                 KEEP(*(.pci_fixup_final))                               \
 413                 __end_pci_fixups_final = .;                             \
 414                 __start_pci_fixups_enable = .;                          \
 415                 KEEP(*(.pci_fixup_enable))                              \
 416                 __end_pci_fixups_enable = .;                            \
 417                 __start_pci_fixups_resume = .;                          \
 418                 KEEP(*(.pci_fixup_resume))                              \
 419                 __end_pci_fixups_resume = .;                            \
 420                 __start_pci_fixups_resume_early = .;                    \
 421                 KEEP(*(.pci_fixup_resume_early))                        \
 422                 __end_pci_fixups_resume_early = .;                      \
 423                 __start_pci_fixups_suspend = .;                         \
 424                 KEEP(*(.pci_fixup_suspend))                             \
 425                 __end_pci_fixups_suspend = .;                           \
 426                 __start_pci_fixups_suspend_late = .;                    \
 427                 KEEP(*(.pci_fixup_suspend_late))                        \
 428                 __end_pci_fixups_suspend_late = .;                      \
 429         }                                                               \
 430                                                                         \
 431         /* Built-in firmware blobs */                                   \
 432         .builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {      \
 433                 __start_builtin_fw = .;                                 \
 434                 KEEP(*(.builtin_fw))                                    \
 435                 __end_builtin_fw = .;                                   \
 436         }                                                               \
 437                                                                         \
 438         TRACEDATA                                                       \
 439                                                                         \
 440         /* Kernel symbol table: Normal symbols */                       \
 441         __ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {         \
 442                 __start___ksymtab = .;                                  \
 443                 KEEP(*(SORT(___ksymtab+*)))                             \
 444                 __stop___ksymtab = .;                                   \
 445         }                                                               \
 446                                                                         \
 447         /* Kernel symbol table: GPL-only symbols */                     \
 448         __ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {     \
 449                 __start___ksymtab_gpl = .;                              \
 450                 KEEP(*(SORT(___ksymtab_gpl+*)))                         \
 451                 __stop___ksymtab_gpl = .;                               \
 452         }                                                               \
 453                                                                         \
 454         /* Kernel symbol table: Normal unused symbols */                \
 455         __ksymtab_unused  : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) {  \
 456                 __start___ksymtab_unused = .;                           \
 457                 KEEP(*(SORT(___ksymtab_unused+*)))                      \
 458                 __stop___ksymtab_unused = .;                            \
 459         }                                                               \
 460                                                                         \
 461         /* Kernel symbol table: GPL-only unused symbols */              \
 462         __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
 463                 __start___ksymtab_unused_gpl = .;                       \
 464                 KEEP(*(SORT(___ksymtab_unused_gpl+*)))                  \
 465                 __stop___ksymtab_unused_gpl = .;                        \
 466         }                                                               \
 467                                                                         \
 468         /* Kernel symbol table: GPL-future-only symbols */              \
 469         __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
 470                 __start___ksymtab_gpl_future = .;                       \
 471                 KEEP(*(SORT(___ksymtab_gpl_future+*)))                  \
 472                 __stop___ksymtab_gpl_future = .;                        \
 473         }                                                               \
 474                                                                         \
 475         /* Kernel symbol table: Normal symbols */                       \
 476         __kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {         \
 477                 __start___kcrctab = .;                                  \
 478                 KEEP(*(SORT(___kcrctab+*)))                             \
 479                 __stop___kcrctab = .;                                   \
 480         }                                                               \
 481                                                                         \
 482         /* Kernel symbol table: GPL-only symbols */                     \
 483         __kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {     \
 484                 __start___kcrctab_gpl = .;                              \
 485                 KEEP(*(SORT(___kcrctab_gpl+*)))                         \
 486                 __stop___kcrctab_gpl = .;                               \
 487         }                                                               \
 488                                                                         \
 489         /* Kernel symbol table: Normal unused symbols */                \
 490         __kcrctab_unused  : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) {  \
 491                 __start___kcrctab_unused = .;                           \
 492                 KEEP(*(SORT(___kcrctab_unused+*)))                      \
 493                 __stop___kcrctab_unused = .;                            \
 494         }                                                               \
 495                                                                         \
 496         /* Kernel symbol table: GPL-only unused symbols */              \
 497         __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
 498                 __start___kcrctab_unused_gpl = .;                       \
 499                 KEEP(*(SORT(___kcrctab_unused_gpl+*)))                  \
 500                 __stop___kcrctab_unused_gpl = .;                        \
 501         }                                                               \
 502                                                                         \
 503         /* Kernel symbol table: GPL-future-only symbols */              \
 504         __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
 505                 __start___kcrctab_gpl_future = .;                       \
 506                 KEEP(*(SORT(___kcrctab_gpl_future+*)))                  \
 507                 __stop___kcrctab_gpl_future = .;                        \
 508         }                                                               \
 509                                                                         \
 510         /* Kernel symbol table: strings */                              \
 511         __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
 512                 *(__ksymtab_strings)                                    \
 513         }                                                               \
 514                                                                         \
 515         /* __*init sections */                                          \
 516         __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {         \
 517                 *(.ref.rodata)                                          \
 518                 MEM_KEEP(init.rodata)                                   \
 519                 MEM_KEEP(exit.rodata)                                   \
 520         }                                                               \
 521                                                                         \
 522         /* Built-in module parameters. */                               \
 523         __param : AT(ADDR(__param) - LOAD_OFFSET) {                     \
 524                 __start___param = .;                                    \
 525                 KEEP(*(__param))                                        \
 526                 __stop___param = .;                                     \
 527         }                                                               \
 528                                                                         \
 529         /* Built-in module versions. */                                 \
 530         __modver : AT(ADDR(__modver) - LOAD_OFFSET) {                   \
 531                 __start___modver = .;                                   \
 532                 KEEP(*(__modver))                                       \
 533                 __stop___modver = .;                                    \
 534         }                                                               \
 535                                                                         \
 536         RO_EXCEPTION_TABLE                                              \
 537         NOTES                                                           \
 538                                                                         \
 539         . = ALIGN((align));                                             \
 540         __end_rodata = .;
 541
 542 /*
 543  * .text section. Map to function alignment to avoid address changes
 544  * during second ld run in second ld pass when generating System.map
 545  *
 546  * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead
 547  * code elimination is enabled, so these sections should be converted
 548  * to use ".." first.
 549  */
 550 #define TEXT_TEXT                                                       \
 551                 ALIGN_FUNCTION();                                       \
 552                 *(.text.hot TEXT_MAIN .text.fixup .text.unlikely)       \
 553                 *(.text..refcount)                                      \
 554                 *(.ref.text)                                            \
 555         MEM_KEEP(init.text*)                                            \
 556         MEM_KEEP(exit.text*)                                            \
 557
 558
 559 /* sched.text is aling to function alignment to secure we have same
 560  * address even at second ld pass when generating System.map */
 561 #define SCHED_TEXT                                                      \
 562                 ALIGN_FUNCTION();                                       \
 563                 __sched_text_start = .;                                 \
 564                 *(.sched.text)                                          \
 565                 __sched_text_end = .;
 566
 567 /* spinlock.text is aling to function alignment to secure we have same
 568  * address even at second ld pass when generating System.map */
 569 #define LOCK_TEXT                                                       \
 570                 ALIGN_FUNCTION();                                       \
 571                 __lock_text_start = .;                                  \
 572                 *(.spinlock.text)                                       \
 573                 __lock_text_end = .;
 574
 575 #define CPUIDLE_TEXT                                                    \
 576                 ALIGN_FUNCTION();                                       \
 577                 __cpuidle_text_start = .;                               \
 578                 *(.cpuidle.text)                                        \
 579                 __cpuidle_text_end = .;
 580
 581 #define KPROBES_TEXT                                                    \
 582                 ALIGN_FUNCTION();                                       \
 583                 __kprobes_text_start = .;                               \
 584                 *(.kprobes.text)                                        \
 585                 __kprobes_text_end = .;
 586
 587 #define ENTRY_TEXT                                                      \
 588                 ALIGN_FUNCTION();                                       \
 589                 __entry_text_start = .;                                 \
 590                 *(.entry.text)                                          \
 591                 __entry_text_end = .;
 592
 593 #define IRQENTRY_TEXT                                                   \
 594                 ALIGN_FUNCTION();                                       \
 595                 __irqentry_text_start = .;                              \
 596                 *(.irqentry.text)                                       \
 597                 __irqentry_text_end = .;
 598
 599 #define SOFTIRQENTRY_TEXT                                               \
 600                 ALIGN_FUNCTION();                                       \
 601                 __softirqentry_text_start = .;                          \
 602                 *(.softirqentry.text)                                   \
 603                 __softirqentry_text_end = .;
 604
 605 /* Section used for early init (in .S files) */
 606 #define HEAD_TEXT  KEEP(*(.head.text))
 607
 608 #define HEAD_TEXT_SECTION                                                       \
 609         .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {               \
 610                 HEAD_TEXT                                               \
 611         }
 612
 613 /*
 614  * Exception table
 615  */
 616 #define EXCEPTION_TABLE(align)                                          \
 617         . = ALIGN(align);                                               \
 618         __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {               \
 619                 __start___ex_table = .;                                 \
 620                 KEEP(*(__ex_table))                                     \
 621                 __stop___ex_table = .;                                  \
 622         }
 623
 624 /*
 625  * Init task
 626  */
 627 #define INIT_TASK_DATA_SECTION(align)                                   \
 628         . = ALIGN(align);                                               \
 629         .data..init_task :  AT(ADDR(.data..init_task) - LOAD_OFFSET) {  \
 630                 INIT_TASK_DATA(align)                                   \
 631         }
 632
 633 #ifdef CONFIG_CONSTRUCTORS
 634 #define KERNEL_CTORS()  . = ALIGN(8);                      \
 635                         __ctors_start = .;                 \
 636                         KEEP(*(.ctors))                    \
 637                         KEEP(*(SORT(.init_array.*)))       \
 638                         KEEP(*(.init_array))               \
 639                         __ctors_end = .;
 640 #else
 641 #define KERNEL_CTORS()
 642 #endif
 643
 644 /* init and exit section handling */
 645 #define INIT_DATA                                                       \
 646         KEEP(*(SORT(___kentry+*)))                                      \
 647         *(.init.data init.data.*)                                       \
 648         MEM_DISCARD(init.data*)                                         \
 649         KERNEL_CTORS()                                                  \
 650         MCOUNT_REC()                                                    \
 651         *(.init.rodata .init.rodata.*)                                  \
 652         FTRACE_EVENTS()                                                 \
 653         TRACE_SYSCALLS()                                                \
 654         KPROBE_BLACKLIST()                                              \
 655         ERROR_INJECT_WHITELIST()                                        \
 656         MEM_DISCARD(init.rodata)                                        \
 657         CLK_OF_TABLES()                                                 \
 658         RESERVEDMEM_OF_TABLES()                                         \
 659         TIMER_OF_TABLES()                                               \
 660         CPU_METHOD_OF_TABLES()                                          \
 661         CPUIDLE_METHOD_OF_TABLES()                                      \
 662         KERNEL_DTB()                                                    \
 663         IRQCHIP_OF_MATCH_TABLE()                                        \
 664         ACPI_PROBE_TABLE(irqchip)                                       \
 665         ACPI_PROBE_TABLE(timer)                                         \
 666         THERMAL_TABLE(governor)                                         \
 667         EARLYCON_TABLE()                                                \
 668         LSM_TABLE()                                                     \
 669         EARLY_LSM_TABLE()
 670
 671 #define INIT_TEXT                                                       \
 672         *(.init.text .init.text.*)                                      \
 673         *(.text.startup)                                                \
 674         MEM_DISCARD(init.text*)
 675
 676 #define EXIT_DATA                                                       \
 677         *(.exit.data .exit.data.*)                                      \
 678         *(.fini_array .fini_array.*)                                    \
 679         *(.dtors .dtors.*)                                              \
 680         MEM_DISCARD(exit.data*)                                         \
 681         MEM_DISCARD(exit.rodata*)
 682
 683 #define EXIT_TEXT                                                       \
 684         *(.exit.text)                                                   \
 685         *(.text.exit)                                                   \
 686         MEM_DISCARD(exit.text)
 687
 688 #define EXIT_CALL                                                       \
 689         *(.exitcall.exit)
 690
 691 /*
 692  * bss (Block Started by Symbol) - uninitialized data
 693  * zeroed during startup
 694  */
 695 #define SBSS(sbss_align)                                                \
 696         . = ALIGN(sbss_align);                                          \
 697         .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {                         \
 698                 *(.dynsbss)                                             \
 699                 *(SBSS_MAIN)                                            \
 700                 *(.scommon)                                             \
 701         }
 702
 703 /*
 704  * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
 705  * sections to the front of bss.
 706  */
 707 #ifndef BSS_FIRST_SECTIONS
 708 #define BSS_FIRST_SECTIONS
 709 #endif
 710
 711 #define BSS(bss_align)                                                  \
 712         . = ALIGN(bss_align);                                           \
 713         .bss : AT(ADDR(.bss) - LOAD_OFFSET) {                           \
 714                 BSS_FIRST_SECTIONS                                      \
 715                 *(.bss..page_aligned)                                   \
 716                 *(.dynbss)                                              \
 717                 *(BSS_MAIN)                                             \
 718                 *(COMMON)                                               \
 719         }
 720
 721 /*
 722  * DWARF debug sections.
 723  * Symbols in the DWARF debugging sections are relative to
 724  * the beginning of the section so we begin them at 0.
 725  */
 726 #define DWARF_DEBUG                                                     \
 727                 /* DWARF 1 */                                           \
 728                 .debug          0 : { *(.debug) }                       \
 729                 .line           0 : { *(.line) }                        \
 730                 /* GNU DWARF 1 extensions */                            \
 731                 .debug_srcinfo  0 : { *(.debug_srcinfo) }               \
 732                 .debug_sfnames  0 : { *(.debug_sfnames) }               \
 733                 /* DWARF 1.1 and DWARF 2 */                             \
 734                 .debug_aranges  0 : { *(.debug_aranges) }               \
 735                 .debug_pubnames 0 : { *(.debug_pubnames) }              \
 736                 /* DWARF 2 */                                           \
 737                 .debug_info     0 : { *(.debug_info                     \
 738                                 .gnu.linkonce.wi.*) }                   \
 739                 .debug_abbrev   0 : { *(.debug_abbrev) }                \
 740                 .debug_line     0 : { *(.debug_line) }                  \
 741                 .debug_frame    0 : { *(.debug_frame) }                 \
 742                 .debug_str      0 : { *(.debug_str) }                   \
 743                 .debug_loc      0 : { *(.debug_loc) }                   \
 744                 .debug_macinfo  0 : { *(.debug_macinfo) }               \
 745                 .debug_pubtypes 0 : { *(.debug_pubtypes) }              \
 746                 /* DWARF 3 */                                           \
 747                 .debug_ranges   0 : { *(.debug_ranges) }                \
 748                 /* SGI/MIPS DWARF 2 extensions */                       \
 749                 .debug_weaknames 0 : { *(.debug_weaknames) }            \
 750                 .debug_funcnames 0 : { *(.debug_funcnames) }            \
 751                 .debug_typenames 0 : { *(.debug_typenames) }            \
 752                 .debug_varnames  0 : { *(.debug_varnames) }             \
 753                 /* GNU DWARF 2 extensions */                            \
 754                 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) }      \
 755                 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) }      \
 756                 /* DWARF 4 */                                           \
 757                 .debug_types    0 : { *(.debug_types) }                 \
 758                 /* DWARF 5 */                                           \
 759                 .debug_macro    0 : { *(.debug_macro) }                 \
 760                 .debug_addr     0 : { *(.debug_addr) }
 761
 762                 /* Stabs debugging sections.  */
 763 #define STABS_DEBUG                                                     \
 764                 .stab 0 : { *(.stab) }                                  \
 765                 .stabstr 0 : { *(.stabstr) }                            \
 766                 .stab.excl 0 : { *(.stab.excl) }                        \
 767                 .stab.exclstr 0 : { *(.stab.exclstr) }                  \
 768                 .stab.index 0 : { *(.stab.index) }                      \
 769                 .stab.indexstr 0 : { *(.stab.indexstr) }                \
 770                 .comment 0 : { *(.comment) }
 771
 772 #ifdef CONFIG_GENERIC_BUG
 773 #define BUG_TABLE                                                       \
 774         . = ALIGN(8);                                                   \
 775         __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {             \
 776                 __start___bug_table = .;                                \
 777                 KEEP(*(__bug_table))                                    \
 778                 __stop___bug_table = .;                                 \
 779         }
 780 #else
 781 #define BUG_TABLE
 782 #endif
 783
 784 #ifdef CONFIG_UNWINDER_ORC
 785 #define ORC_UNWIND_TABLE                                                \
 786         . = ALIGN(4);                                                   \
 787         .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) {       \
 788                 __start_orc_unwind_ip = .;                              \
 789                 KEEP(*(.orc_unwind_ip))                                 \
 790                 __stop_orc_unwind_ip = .;                               \
 791         }                                                               \
 792         . = ALIGN(2);                                                   \
 793         .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) {             \
 794                 __start_orc_unwind = .;                                 \
 795                 KEEP(*(.orc_unwind))                                    \
 796                 __stop_orc_unwind = .;                                  \
 797         }                                                               \
 798         . = ALIGN(4);                                                   \
 799         .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) {             \
 800                 orc_lookup = .;                                         \
 801                 . += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) /        \
 802                         LOOKUP_BLOCK_SIZE) + 1) * 4;                    \
 803                 orc_lookup_end = .;                                     \
 804         }
 805 #else
 806 #define ORC_UNWIND_TABLE
 807 #endif
 808
 809 #ifdef CONFIG_PM_TRACE
 810 #define TRACEDATA                                                       \
 811         . = ALIGN(4);                                                   \
 812         .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {               \
 813                 __tracedata_start = .;                                  \
 814                 KEEP(*(.tracedata))                                     \
 815                 __tracedata_end = .;                                    \
 816         }
 817 #else
 818 #define TRACEDATA
 819 #endif
 820
 821 #define NOTES                                                           \
 822         .notes : AT(ADDR(.notes) - LOAD_OFFSET) {                       \
 823                 __start_notes = .;                                      \
 824                 KEEP(*(.note.*))                                        \
 825                 __stop_notes = .;                                       \
 826         } NOTES_HEADERS                                                 \
 827         NOTES_HEADERS_RESTORE
 828
 829 #define INIT_SETUP(initsetup_align)                                     \
 830                 . = ALIGN(initsetup_align);                             \
 831                 __setup_start = .;                                      \
 832                 KEEP(*(.init.setup))                                    \
 833                 __setup_end = .;
 834
 835 #define INIT_CALLS_LEVEL(level)                                         \
 836                 __initcall##level##_start = .;                          \
 837                 KEEP(*(.initcall##level##.init))                        \
 838                 KEEP(*(.initcall##level##s.init))                       \
 839
 840 #define INIT_CALLS                                                      \
 841                 __initcall_start = .;                                   \
 842                 KEEP(*(.initcallearly.init))                            \
 843                 INIT_CALLS_LEVEL(0)                                     \
 844                 INIT_CALLS_LEVEL(1)                                     \
 845                 INIT_CALLS_LEVEL(2)                                     \
 846                 INIT_CALLS_LEVEL(3)                                     \
 847                 INIT_CALLS_LEVEL(4)                                     \
 848                 INIT_CALLS_LEVEL(5)                                     \
 849                 INIT_CALLS_LEVEL(rootfs)                                \
 850                 INIT_CALLS_LEVEL(6)                                     \
 851                 INIT_CALLS_LEVEL(7)                                     \
 852                 __initcall_end = .;
 853
 854 #define CON_INITCALL                                                    \
 855                 __con_initcall_start = .;                               \
 856                 KEEP(*(.con_initcall.init))                             \
 857                 __con_initcall_end = .;
 858
 859 #ifdef CONFIG_BLK_DEV_INITRD
 860 #define INIT_RAM_FS                                                     \
 861         . = ALIGN(4);                                                   \
 862         __initramfs_start = .;                                          \
 863         KEEP(*(.init.ramfs))                                            \
 864         . = ALIGN(8);                                                   \
 865         KEEP(*(.init.ramfs.info))
 866 #else
 867 #define INIT_RAM_FS
 868 #endif
 869
 870 /*
 871  * Memory encryption operates on a page basis. Since we need to clear
 872  * the memory encryption mask for this section, it needs to be aligned
 873  * on a page boundary and be a page-size multiple in length.
 874  *
 875  * Note: We use a separate section so that only this section gets
 876  * decrypted to avoid exposing more than we wish.
 877  */
 878 #ifdef CONFIG_AMD_MEM_ENCRYPT
 879 #define PERCPU_DECRYPTED_SECTION                                        \
 880         . = ALIGN(PAGE_SIZE);                                           \
 881         *(.data..percpu..decrypted)                                     \
 882         . = ALIGN(PAGE_SIZE);
 883 #else
 884 #define PERCPU_DECRYPTED_SECTION
 885 #endif
 886
 887
 888 /*
 889  * Default discarded sections.
 890  *
 891  * Some archs want to discard exit text/data at runtime rather than
 892  * link time due to cross-section references such as alt instructions,
 893  * bug table, eh_frame, etc.  DISCARDS must be the last of output
 894  * section definitions so that such archs put those in earlier section
 895  * definitions.
 896  */
 897 #define DISCARDS                                                        \
 898         /DISCARD/ : {                                                   \
 899         EXIT_TEXT                                                       \
 900         EXIT_DATA                                                       \
 901         EXIT_CALL                                                       \
 902         *(.discard)                                                     \
 903         *(.discard.*)                                                   \
 904         *(.modinfo)                                                     \
 905         }
 906
 907 /**
 908  * PERCPU_INPUT - the percpu input sections
 909  * @cacheline: cacheline size
 910  *
 911  * The core percpu section names and core symbols which do not rely
 912  * directly upon load addresses.
 913  *
 914  * @cacheline is used to align subsections to avoid false cacheline
 915  * sharing between subsections for different purposes.
 916  */
 917 #define PERCPU_INPUT(cacheline)                                         \
 918         __per_cpu_start = .;                                            \
 919         *(.data..percpu..first)                                         \
 920         . = ALIGN(PAGE_SIZE);                                           \
 921         *(.data..percpu..page_aligned)                                  \
 922         . = ALIGN(cacheline);                                           \
 923         *(.data..percpu..read_mostly)                                   \
 924         . = ALIGN(cacheline);                                           \
 925         *(.data..percpu)                                                \
 926         *(.data..percpu..shared_aligned)                                \
 927         PERCPU_DECRYPTED_SECTION                                        \
 928         __per_cpu_end = .;
 929
 930 /**
 931  * PERCPU_VADDR - define output section for percpu area
 932  * @cacheline: cacheline size
 933  * @vaddr: explicit base address (optional)
 934  * @phdr: destination PHDR (optional)
 935  *
 936  * Macro which expands to output section for percpu area.
 937  *
 938  * @cacheline is used to align subsections to avoid false cacheline
 939  * sharing between subsections for different purposes.
 940  *
 941  * If @vaddr is not blank, it specifies explicit base address and all
 942  * percpu symbols will be offset from the given address.  If blank,
 943  * @vaddr always equals @laddr + LOAD_OFFSET.
 944  *
 945  * @phdr defines the output PHDR to use if not blank.  Be warned that
 946  * output PHDR is sticky.  If @phdr is specified, the next output
 947  * section in the linker script will go there too.  @phdr should have
 948  * a leading colon.
 949  *
 950  * Note that this macros defines __per_cpu_load as an absolute symbol.
 951  * If there is no need to put the percpu section at a predetermined
 952  * address, use PERCPU_SECTION.
 953  */
 954 #define PERCPU_VADDR(cacheline, vaddr, phdr)                            \
 955         __per_cpu_load = .;                                             \
 956         .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) {        \
 957                 PERCPU_INPUT(cacheline)                                 \
 958         } phdr                                                          \
 959         . = __per_cpu_load + SIZEOF(.data..percpu);
 960
 961 /**
 962  * PERCPU_SECTION - define output section for percpu area, simple version
 963  * @cacheline: cacheline size
 964  *
 965  * Align to PAGE_SIZE and outputs output section for percpu area.  This
 966  * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
 967  * __per_cpu_start will be identical.
 968  *
 969  * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
 970  * except that __per_cpu_load is defined as a relative symbol against
 971  * .data..percpu which is required for relocatable x86_32 configuration.
 972  */
 973 #define PERCPU_SECTION(cacheline)                                       \
 974         . = ALIGN(PAGE_SIZE);                                           \
 975         .data..percpu   : AT(ADDR(.data..percpu) - LOAD_OFFSET) {       \
 976                 __per_cpu_load = .;                                     \
 977                 PERCPU_INPUT(cacheline)                                 \
 978         }
 979
 980
 981 /*
 982  * Definition of the high level *_SECTION macros
 983  * They will fit only a subset of the architectures
 984  */
 985
 986
 987 /*
 988  * Writeable data.
 989  * All sections are combined in a single .data section.
 990  * The sections following CONSTRUCTORS are arranged so their
 991  * typical alignment matches.
 992  * A cacheline is typical/always less than a PAGE_SIZE so
 993  * the sections that has this restriction (or similar)
 994  * is located before the ones requiring PAGE_SIZE alignment.
 995  * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
 996  * matches the requirement of PAGE_ALIGNED_DATA.
 997  *
 998  * use 0 as page_align if page_aligned data is not used */
 999 #define RW_DATA(cacheline, pagealigned, inittask)                       \
1000         . = ALIGN(PAGE_SIZE);                                           \
1001         .data : AT(ADDR(.data) - LOAD_OFFSET) {                         \
1002                 INIT_TASK_DATA(inittask)                                \
1003                 NOSAVE_DATA                                             \
1004                 PAGE_ALIGNED_DATA(pagealigned)                          \
1005                 CACHELINE_ALIGNED_DATA(cacheline)                       \
1006                 READ_MOSTLY_DATA(cacheline)                             \
1007                 DATA_DATA                                               \
1008                 CONSTRUCTORS                                            \
1009         }                                                               \
1010         BUG_TABLE                                                       \
1011
1012 #define INIT_TEXT_SECTION(inittext_align)                               \
1013         . = ALIGN(inittext_align);                                      \
1014         .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {               \
1015                 _sinittext = .;                                         \
1016                 INIT_TEXT                                               \
1017                 _einittext = .;                                         \
1018         }
1019
1020 #define INIT_DATA_SECTION(initsetup_align)                              \
1021         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {               \
1022                 INIT_DATA                                               \
1023                 INIT_SETUP(initsetup_align)                             \
1024                 INIT_CALLS                                              \
1025                 CON_INITCALL                                            \
1026                 INIT_RAM_FS                                             \
1027         }
1028
1029 #define BSS_SECTION(sbss_align, bss_align, stop_align)                  \
1030         . = ALIGN(sbss_align);                                          \
1031         __bss_start = .;                                                \
1032         SBSS(sbss_align)                                                \
1033         BSS(bss_align)                                                  \
1034         . = ALIGN(stop_align);                                          \
1035         __bss_stop = .;