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_SECTION(PAGE_SIZE)
  27  *      RW_DATA_SECTION(...)
  28  *      _edata = .;
  29  *
  30  *      EXCEPTION_TABLE(...)
  31  *      NOTES
  32  *
  33  *      BSS_SECTION(0, 0, 0)
  34  *      _end = .;
  35  *
  36  *      STABS_DEBUG
  37  *      DWARF_DEBUG
  38  *
  39  *      DISCARDS                // must be the last
  40  * }
  41  *
  42  * [__init_begin, __init_end] is the init section that may be freed after init
  43  *      // __init_begin and __init_end should be page aligned, so that we can
  44  *      // free the whole .init memory
  45  * [_stext, _etext] is the text section
  46  * [_sdata, _edata] is the data section
  47  *
  48  * Some of the included output section have their own set of constants.
  49  * Examples are: [__initramfs_start, __initramfs_end] for initramfs and
  50  *               [__nosave_begin, __nosave_end] for the nosave data
  51  */
  52
  53 #ifndef LOAD_OFFSET
  54 #define LOAD_OFFSET 0
  55 #endif
  56
  57 #include <linux/export.h>
  58
  59 /* Align . to a 8 byte boundary equals to maximum function alignment. */
  60 #define ALIGN_FUNCTION()  . = ALIGN(8)
  61
  62 /*
  63  * LD_DEAD_CODE_DATA_ELIMINATION option enables -fdata-sections, which
  64  * generates .data.identifier sections, which need to be pulled in with
  65  * .data. We don't want to pull in .data..other sections, which Linux
  66  * has defined. Same for text and bss.
  67  */
  68 #ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
  69 #define TEXT_MAIN .text .text.[0-9a-zA-Z_]*
  70 #define DATA_MAIN .data .data.[0-9a-zA-Z_]*
  71 #define BSS_MAIN .bss .bss.[0-9a-zA-Z_]*
  72 #else
  73 #define TEXT_MAIN .text
  74 #define DATA_MAIN .data
  75 #define BSS_MAIN .bss
  76 #endif
  77
  78 /*
  79  * Align to a 32 byte boundary equal to the
  80  * alignment gcc 4.5 uses for a struct
  81  */
  82 #define STRUCT_ALIGNMENT 32
  83 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
  84
  85 /* The actual configuration determine if the init/exit sections
  86  * are handled as text/data or they can be discarded (which
  87  * often happens at runtime)
  88  */
  89 #ifdef CONFIG_HOTPLUG_CPU
  90 #define CPU_KEEP(sec)    *(.cpu##sec)
  91 #define CPU_DISCARD(sec)
  92 #else
  93 #define CPU_KEEP(sec)
  94 #define CPU_DISCARD(sec) *(.cpu##sec)
  95 #endif
  96
  97 #if defined(CONFIG_MEMORY_HOTPLUG)
  98 #define MEM_KEEP(sec)    *(.mem##sec)
  99 #define MEM_DISCARD(sec)
 100 #else
 101 #define MEM_KEEP(sec)
 102 #define MEM_DISCARD(sec) *(.mem##sec)
 103 #endif
 104
 105 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
 106 #define MCOUNT_REC()    . = ALIGN(8);                           \
 107                         VMLINUX_SYMBOL(__start_mcount_loc) = .; \
 108                         *(__mcount_loc)                         \
 109                         VMLINUX_SYMBOL(__stop_mcount_loc) = .;
 110 #else
 111 #define MCOUNT_REC()
 112 #endif
 113
 114 #ifdef CONFIG_TRACE_BRANCH_PROFILING
 115 #define LIKELY_PROFILE()        VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \
 116                                 *(_ftrace_annotated_branch)                           \
 117                                 VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .;
 118 #else
 119 #define LIKELY_PROFILE()
 120 #endif
 121
 122 #ifdef CONFIG_PROFILE_ALL_BRANCHES
 123 #define BRANCH_PROFILE()        VMLINUX_SYMBOL(__start_branch_profile) = .;   \
 124                                 *(_ftrace_branch)                             \
 125                                 VMLINUX_SYMBOL(__stop_branch_profile) = .;
 126 #else
 127 #define BRANCH_PROFILE()
 128 #endif
 129
 130 #ifdef CONFIG_KPROBES
 131 #define KPROBE_BLACKLIST()      . = ALIGN(8);                                 \
 132                                 VMLINUX_SYMBOL(__start_kprobe_blacklist) = .; \
 133                                 *(_kprobe_blacklist)                          \
 134                                 VMLINUX_SYMBOL(__stop_kprobe_blacklist) = .;
 135 #else
 136 #define KPROBE_BLACKLIST()
 137 #endif
 138
 139 #ifdef CONFIG_EVENT_TRACING
 140 #define FTRACE_EVENTS() . = ALIGN(8);                                   \
 141                         VMLINUX_SYMBOL(__start_ftrace_events) = .;      \
 142                         *(_ftrace_events)                               \
 143                         VMLINUX_SYMBOL(__stop_ftrace_events) = .;       \
 144                         VMLINUX_SYMBOL(__start_ftrace_enum_maps) = .;   \
 145                         *(_ftrace_enum_map)                             \
 146                         VMLINUX_SYMBOL(__stop_ftrace_enum_maps) = .;
 147 #else
 148 #define FTRACE_EVENTS()
 149 #endif
 150
 151 #ifdef CONFIG_TRACING
 152 #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .;      \
 153                          *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \
 154                          VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;
 155 #define TRACEPOINT_STR() VMLINUX_SYMBOL(__start___tracepoint_str) = .;  \
 156                          *(__tracepoint_str) /* Trace_printk fmt' pointer */ \
 157                          VMLINUX_SYMBOL(__stop___tracepoint_str) = .;
 158 #else
 159 #define TRACE_PRINTKS()
 160 #define TRACEPOINT_STR()
 161 #endif
 162
 163 #ifdef CONFIG_FTRACE_SYSCALLS
 164 #define TRACE_SYSCALLS() . = ALIGN(8);                                  \
 165                          VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \
 166                          *(__syscalls_metadata)                         \
 167                          VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
 168 #else
 169 #define TRACE_SYSCALLS()
 170 #endif
 171
 172 #ifdef CONFIG_SERIAL_EARLYCON
 173 #define EARLYCON_TABLE() . = ALIGN(8);                          \
 174                          VMLINUX_SYMBOL(__earlycon_table) = .;  \
 175                          *(__earlycon_table)                    \
 176                          VMLINUX_SYMBOL(__earlycon_table_end) = .;
 177 #else
 178 #define EARLYCON_TABLE()
 179 #endif
 180
 181 #define ___OF_TABLE(cfg, name)  _OF_TABLE_##cfg(name)
 182 #define __OF_TABLE(cfg, name)   ___OF_TABLE(cfg, name)
 183 #define OF_TABLE(cfg, name)     __OF_TABLE(IS_ENABLED(cfg), name)
 184 #define _OF_TABLE_0(name)
 185 #define _OF_TABLE_1(name)                                               \
 186         . = ALIGN(8);                                                   \
 187         VMLINUX_SYMBOL(__##name##_of_table) = .;                        \
 188         *(__##name##_of_table)                                          \
 189         *(__##name##_of_table_end)
 190
 191 #define CLKSRC_OF_TABLES()      OF_TABLE(CONFIG_CLKSRC_OF, clksrc)
 192 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
 193 #define CLK_OF_TABLES()         OF_TABLE(CONFIG_COMMON_CLK, clk)
 194 #define IOMMU_OF_TABLES()       OF_TABLE(CONFIG_OF_IOMMU, iommu)
 195 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
 196 #define CPU_METHOD_OF_TABLES()  OF_TABLE(CONFIG_SMP, cpu_method)
 197 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method)
 198
 199 #ifdef CONFIG_ACPI
 200 #define ACPI_PROBE_TABLE(name)                                          \
 201         . = ALIGN(8);                                                   \
 202         VMLINUX_SYMBOL(__##name##_acpi_probe_table) = .;                \
 203         *(__##name##_acpi_probe_table)                                  \
 204         VMLINUX_SYMBOL(__##name##_acpi_probe_table_end) = .;
 205 #else
 206 #define ACPI_PROBE_TABLE(name)
 207 #endif
 208
 209 #define KERNEL_DTB()                                                    \
 210         STRUCT_ALIGN();                                                 \
 211         VMLINUX_SYMBOL(__dtb_start) = .;                                \
 212         *(.dtb.init.rodata)                                             \
 213         VMLINUX_SYMBOL(__dtb_end) = .;
 214
 215 /*
 216  * .data section
 217  */
 218 #define DATA_DATA                                                       \
 219         *(DATA_MAIN)                                                    \
 220         *(.ref.data)                                                    \
 221         *(.data..shared_aligned) /* percpu related */                   \
 222         MEM_KEEP(init.data)                                             \
 223         MEM_KEEP(exit.data)                                             \
 224         *(.data.unlikely)                                               \
 225         STRUCT_ALIGN();                                                 \
 226         *(__tracepoints)                                                \
 227         /* implement dynamic printk debug */                            \
 228         . = ALIGN(8);                                                   \
 229         VMLINUX_SYMBOL(__start___jump_table) = .;                       \
 230         *(__jump_table)                                                 \
 231         VMLINUX_SYMBOL(__stop___jump_table) = .;                        \
 232         . = ALIGN(8);                                                   \
 233         VMLINUX_SYMBOL(__start___verbose) = .;                          \
 234         *(__verbose)                                                    \
 235         VMLINUX_SYMBOL(__stop___verbose) = .;                           \
 236         LIKELY_PROFILE()                                                \
 237         BRANCH_PROFILE()                                                \
 238         TRACE_PRINTKS()                                                 \
 239         TRACEPOINT_STR()
 240
 241 /*
 242  * Data section helpers
 243  */
 244 #define NOSAVE_DATA                                                     \
 245         . = ALIGN(PAGE_SIZE);                                           \
 246         VMLINUX_SYMBOL(__nosave_begin) = .;                             \
 247         *(.data..nosave)                                                \
 248         . = ALIGN(PAGE_SIZE);                                           \
 249         VMLINUX_SYMBOL(__nosave_end) = .;
 250
 251 #define PAGE_ALIGNED_DATA(page_align)                                   \
 252         . = ALIGN(page_align);                                          \
 253         *(.data..page_aligned)                                          \
 254         . = ALIGN(page_align);
 255
 256 #define READ_MOSTLY_DATA(align)                                         \
 257         . = ALIGN(align);                                               \
 258         *(.data..read_mostly)                                           \
 259         . = ALIGN(align);
 260
 261 #define CACHELINE_ALIGNED_DATA(align)                                   \
 262         . = ALIGN(align);                                               \
 263         *(.data..cacheline_aligned)
 264
 265 #define INIT_TASK_DATA(align)                                           \
 266         . = ALIGN(align);                                               \
 267         VMLINUX_SYMBOL(__start_init_task) = .;                          \
 268         *(.data..init_task)                                             \
 269         VMLINUX_SYMBOL(__end_init_task) = .;
 270
 271 /*
 272  * Allow architectures to handle ro_after_init data on their
 273  * own by defining an empty RO_AFTER_INIT_DATA.
 274  */
 275 #ifndef RO_AFTER_INIT_DATA
 276 #define RO_AFTER_INIT_DATA                                              \
 277         __start_data_ro_after_init = .;                                 \
 278         *(.data..ro_after_init)                                         \
 279         __end_data_ro_after_init = .;
 280 #endif
 281
 282 /*
 283  * Read only Data
 284  */
 285 #define RO_DATA_SECTION(align)                                          \
 286         . = ALIGN((align));                                             \
 287         .rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {           \
 288                 VMLINUX_SYMBOL(__start_rodata) = .;                     \
 289                 *(.rodata) *(.rodata.*)                                 \
 290                 RO_AFTER_INIT_DATA      /* Read only after init */      \
 291                 *(__vermagic)           /* Kernel version magic */      \
 292                 . = ALIGN(8);                                           \
 293                 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .;         \
 294                 *(__tracepoints_ptrs)   /* Tracepoints: pointer array */\
 295                 VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .;          \
 296                 *(__tracepoints_strings)/* Tracepoints: strings */      \
 297         }                                                               \
 298                                                                         \
 299         .rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {          \
 300                 *(.rodata1)                                             \
 301         }                                                               \
 302                                                                         \
 303         BUG_TABLE                                                       \
 304                                                                         \
 305         /* PCI quirks */                                                \
 306         .pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {        \
 307                 VMLINUX_SYMBOL(__start_pci_fixups_early) = .;           \
 308                 *(.pci_fixup_early)                                     \
 309                 VMLINUX_SYMBOL(__end_pci_fixups_early) = .;             \
 310                 VMLINUX_SYMBOL(__start_pci_fixups_header) = .;          \
 311                 *(.pci_fixup_header)                                    \
 312                 VMLINUX_SYMBOL(__end_pci_fixups_header) = .;            \
 313                 VMLINUX_SYMBOL(__start_pci_fixups_final) = .;           \
 314                 *(.pci_fixup_final)                                     \
 315                 VMLINUX_SYMBOL(__end_pci_fixups_final) = .;             \
 316                 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .;          \
 317                 *(.pci_fixup_enable)                                    \
 318                 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .;            \
 319                 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .;          \
 320                 *(.pci_fixup_resume)                                    \
 321                 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .;            \
 322                 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .;    \
 323                 *(.pci_fixup_resume_early)                              \
 324                 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .;      \
 325                 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .;         \
 326                 *(.pci_fixup_suspend)                                   \
 327                 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .;           \
 328                 VMLINUX_SYMBOL(__start_pci_fixups_suspend_late) = .;    \
 329                 *(.pci_fixup_suspend_late)                              \
 330                 VMLINUX_SYMBOL(__end_pci_fixups_suspend_late) = .;      \
 331         }                                                               \
 332                                                                         \
 333         /* Built-in firmware blobs */                                   \
 334         .builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {      \
 335                 VMLINUX_SYMBOL(__start_builtin_fw) = .;                 \
 336                 *(.builtin_fw)                                          \
 337                 VMLINUX_SYMBOL(__end_builtin_fw) = .;                   \
 338         }                                                               \
 339                                                                         \
 340         TRACEDATA                                                       \
 341                                                                         \
 342         /* Kernel symbol table: Normal symbols */                       \
 343         __ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {         \
 344                 VMLINUX_SYMBOL(__start___ksymtab) = .;                  \
 345                 KEEP(*(SORT(___ksymtab+*)))                             \
 346                 VMLINUX_SYMBOL(__stop___ksymtab) = .;                   \
 347         }                                                               \
 348                                                                         \
 349         /* Kernel symbol table: GPL-only symbols */                     \
 350         __ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {     \
 351                 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .;              \
 352                 KEEP(*(SORT(___ksymtab_gpl+*)))                         \
 353                 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .;               \
 354         }                                                               \
 355                                                                         \
 356         /* Kernel symbol table: Normal unused symbols */                \
 357         __ksymtab_unused  : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) {  \
 358                 VMLINUX_SYMBOL(__start___ksymtab_unused) = .;           \
 359                 KEEP(*(SORT(___ksymtab_unused+*)))                      \
 360                 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .;            \
 361         }                                                               \
 362                                                                         \
 363         /* Kernel symbol table: GPL-only unused symbols */              \
 364         __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
 365                 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .;       \
 366                 KEEP(*(SORT(___ksymtab_unused_gpl+*)))                  \
 367                 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .;        \
 368         }                                                               \
 369                                                                         \
 370         /* Kernel symbol table: GPL-future-only symbols */              \
 371         __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
 372                 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .;       \
 373                 KEEP(*(SORT(___ksymtab_gpl_future+*)))                  \
 374                 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .;        \
 375         }                                                               \
 376                                                                         \
 377         /* Kernel symbol table: Normal symbols */                       \
 378         __kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {         \
 379                 VMLINUX_SYMBOL(__start___kcrctab) = .;                  \
 380                 KEEP(*(SORT(___kcrctab+*)))                             \
 381                 VMLINUX_SYMBOL(__stop___kcrctab) = .;                   \
 382         }                                                               \
 383                                                                         \
 384         /* Kernel symbol table: GPL-only symbols */                     \
 385         __kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {     \
 386                 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .;              \
 387                 KEEP(*(SORT(___kcrctab_gpl+*)))                         \
 388                 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .;               \
 389         }                                                               \
 390                                                                         \
 391         /* Kernel symbol table: Normal unused symbols */                \
 392         __kcrctab_unused  : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) {  \
 393                 VMLINUX_SYMBOL(__start___kcrctab_unused) = .;           \
 394                 KEEP(*(SORT(___kcrctab_unused+*)))                      \
 395                 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .;            \
 396         }                                                               \
 397                                                                         \
 398         /* Kernel symbol table: GPL-only unused symbols */              \
 399         __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
 400                 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .;       \
 401                 KEEP(*(SORT(___kcrctab_unused_gpl+*)))                  \
 402                 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .;        \
 403         }                                                               \
 404                                                                         \
 405         /* Kernel symbol table: GPL-future-only symbols */              \
 406         __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
 407                 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .;       \
 408                 KEEP(*(SORT(___kcrctab_gpl_future+*)))                  \
 409                 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .;        \
 410         }                                                               \
 411                                                                         \
 412         /* Kernel symbol table: strings */                              \
 413         __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
 414                 KEEP(*(__ksymtab_strings))                              \
 415         }                                                               \
 416                                                                         \
 417         /* __*init sections */                                          \
 418         __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {         \
 419                 *(.ref.rodata)                                          \
 420                 MEM_KEEP(init.rodata)                                   \
 421                 MEM_KEEP(exit.rodata)                                   \
 422         }                                                               \
 423                                                                         \
 424         /* Built-in module parameters. */                               \
 425         __param : AT(ADDR(__param) - LOAD_OFFSET) {                     \
 426                 VMLINUX_SYMBOL(__start___param) = .;                    \
 427                 *(__param)                                              \
 428                 VMLINUX_SYMBOL(__stop___param) = .;                     \
 429         }                                                               \
 430                                                                         \
 431         /* Built-in module versions. */                                 \
 432         __modver : AT(ADDR(__modver) - LOAD_OFFSET) {                   \
 433                 VMLINUX_SYMBOL(__start___modver) = .;                   \
 434                 *(__modver)                                             \
 435                 VMLINUX_SYMBOL(__stop___modver) = .;                    \
 436                 . = ALIGN((align));                                     \
 437                 VMLINUX_SYMBOL(__end_rodata) = .;                       \
 438         }                                                               \
 439         . = ALIGN((align));
 440
 441 /* RODATA & RO_DATA provided for backward compatibility.
 442  * All archs are supposed to use RO_DATA() */
 443 #define RODATA          RO_DATA_SECTION(4096)
 444 #define RO_DATA(align)  RO_DATA_SECTION(align)
 445
 446 #define SECURITY_INIT                                                   \
 447         .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
 448                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 449                 KEEP(*(.security_initcall.init))                        \
 450                 VMLINUX_SYMBOL(__security_initcall_end) = .;            \
 451         }
 452
 453 /*
 454  * .text section. Map to function alignment to avoid address changes
 455  * during second ld run in second ld pass when generating System.map
 456  *
 457  * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead
 458  * code elimination is enabled, so these sections should be converted
 459  * to use ".." first.
 460  */
 461 #define TEXT_TEXT                                                       \
 462                 ALIGN_FUNCTION();                                       \
 463                 *(.text.hot .text.hot.*)                                \
 464                 *(TEXT_MAIN .text.fixup)                                \
 465                 *(.text.unlikely .text.unlikely.*)                      \
 466                 *(.text.unknown .text.unknown.*)                        \
 467                 *(.ref.text)                                            \
 468                 *(.text.asan.* .text.tsan.*)                            \
 469         MEM_KEEP(init.text)                                             \
 470         MEM_KEEP(exit.text)                                             \
 471
 472
 473 /* sched.text is aling to function alignment to secure we have same
 474  * address even at second ld pass when generating System.map */
 475 #define SCHED_TEXT                                                      \
 476                 ALIGN_FUNCTION();                                       \
 477                 VMLINUX_SYMBOL(__sched_text_start) = .;                 \
 478                 *(.sched.text)                                          \
 479                 VMLINUX_SYMBOL(__sched_text_end) = .;
 480
 481 /* spinlock.text is aling to function alignment to secure we have same
 482  * address even at second ld pass when generating System.map */
 483 #define LOCK_TEXT                                                       \
 484                 ALIGN_FUNCTION();                                       \
 485                 VMLINUX_SYMBOL(__lock_text_start) = .;                  \
 486                 *(.spinlock.text)                                       \
 487                 VMLINUX_SYMBOL(__lock_text_end) = .;
 488
 489 #define CPUIDLE_TEXT                                                    \
 490                 ALIGN_FUNCTION();                                       \
 491                 VMLINUX_SYMBOL(__cpuidle_text_start) = .;               \
 492                 *(.cpuidle.text)                                        \
 493                 VMLINUX_SYMBOL(__cpuidle_text_end) = .;
 494
 495 #define KPROBES_TEXT                                                    \
 496                 ALIGN_FUNCTION();                                       \
 497                 VMLINUX_SYMBOL(__kprobes_text_start) = .;               \
 498                 *(.kprobes.text)                                        \
 499                 VMLINUX_SYMBOL(__kprobes_text_end) = .;
 500
 501 #define ENTRY_TEXT                                                      \
 502                 ALIGN_FUNCTION();                                       \
 503                 VMLINUX_SYMBOL(__entry_text_start) = .;                 \
 504                 *(.entry.text)                                          \
 505                 VMLINUX_SYMBOL(__entry_text_end) = .;
 506
 507 #if defined(CONFIG_FUNCTION_GRAPH_TRACER) || defined(CONFIG_KASAN)
 508 #define IRQENTRY_TEXT                                                   \
 509                 ALIGN_FUNCTION();                                       \
 510                 VMLINUX_SYMBOL(__irqentry_text_start) = .;              \
 511                 *(.irqentry.text)                                       \
 512                 VMLINUX_SYMBOL(__irqentry_text_end) = .;
 513 #else
 514 #define IRQENTRY_TEXT
 515 #endif
 516
 517 #if defined(CONFIG_FUNCTION_GRAPH_TRACER) || defined(CONFIG_KASAN)
 518 #define SOFTIRQENTRY_TEXT                                               \
 519                 ALIGN_FUNCTION();                                       \
 520                 VMLINUX_SYMBOL(__softirqentry_text_start) = .;          \
 521                 *(.softirqentry.text)                                   \
 522                 VMLINUX_SYMBOL(__softirqentry_text_end) = .;
 523 #else
 524 #define SOFTIRQENTRY_TEXT
 525 #endif
 526
 527 /* Section used for early init (in .S files) */
 528 #define HEAD_TEXT  *(.head.text)
 529
 530 #define HEAD_TEXT_SECTION                                                       \
 531         .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {               \
 532                 HEAD_TEXT                                               \
 533         }
 534
 535 /*
 536  * Exception table
 537  */
 538 #define EXCEPTION_TABLE(align)                                          \
 539         . = ALIGN(align);                                               \
 540         __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {               \
 541                 VMLINUX_SYMBOL(__start___ex_table) = .;                 \
 542                 *(__ex_table)                                           \
 543                 VMLINUX_SYMBOL(__stop___ex_table) = .;                  \
 544         }
 545
 546 /*
 547  * Init task
 548  */
 549 #define INIT_TASK_DATA_SECTION(align)                                   \
 550         . = ALIGN(align);                                               \
 551         .data..init_task :  AT(ADDR(.data..init_task) - LOAD_OFFSET) {  \
 552                 INIT_TASK_DATA(align)                                   \
 553         }
 554
 555 #ifdef CONFIG_CONSTRUCTORS
 556 #define KERNEL_CTORS()  . = ALIGN(8);                      \
 557                         VMLINUX_SYMBOL(__ctors_start) = .; \
 558                         *(.ctors)                          \
 559                         *(SORT(.init_array.*))             \
 560                         *(.init_array)                     \
 561                         VMLINUX_SYMBOL(__ctors_end) = .;
 562 #else
 563 #define KERNEL_CTORS()
 564 #endif
 565
 566 /* init and exit section handling */
 567 #define INIT_DATA                                                       \
 568         KEEP(*(SORT(___kentry+*)))                                      \
 569         *(.init.data)                                                   \
 570         MEM_DISCARD(init.data)                                          \
 571         KERNEL_CTORS()                                                  \
 572         MCOUNT_REC()                                                    \
 573         *(.init.rodata)                                                 \
 574         FTRACE_EVENTS()                                                 \
 575         TRACE_SYSCALLS()                                                \
 576         KPROBE_BLACKLIST()                                              \
 577         MEM_DISCARD(init.rodata)                                        \
 578         CLK_OF_TABLES()                                                 \
 579         RESERVEDMEM_OF_TABLES()                                         \
 580         CLKSRC_OF_TABLES()                                              \
 581         IOMMU_OF_TABLES()                                               \
 582         CPU_METHOD_OF_TABLES()                                          \
 583         CPUIDLE_METHOD_OF_TABLES()                                      \
 584         KERNEL_DTB()                                                    \
 585         IRQCHIP_OF_MATCH_TABLE()                                        \
 586         ACPI_PROBE_TABLE(irqchip)                                       \
 587         ACPI_PROBE_TABLE(clksrc)                                        \
 588         EARLYCON_TABLE()
 589
 590 #define INIT_TEXT                                                       \
 591         *(.init.text)                                                   \
 592         *(.text.startup)                                                \
 593         MEM_DISCARD(init.text)
 594
 595 #define EXIT_DATA                                                       \
 596         *(.exit.data)                                                   \
 597         *(.fini_array)                                                  \
 598         *(.dtors)                                                       \
 599         MEM_DISCARD(exit.data)                                          \
 600         MEM_DISCARD(exit.rodata)
 601
 602 #define EXIT_TEXT                                                       \
 603         *(.exit.text)                                                   \
 604         *(.text.exit)                                                   \
 605         MEM_DISCARD(exit.text)
 606
 607 #define EXIT_CALL                                                       \
 608         *(.exitcall.exit)
 609
 610 /*
 611  * bss (Block Started by Symbol) - uninitialized data
 612  * zeroed during startup
 613  */
 614 #define SBSS(sbss_align)                                                \
 615         . = ALIGN(sbss_align);                                          \
 616         .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {                         \
 617                 *(.sbss)                                                \
 618                 *(.scommon)                                             \
 619         }
 620
 621 /*
 622  * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
 623  * sections to the front of bss.
 624  */
 625 #ifndef BSS_FIRST_SECTIONS
 626 #define BSS_FIRST_SECTIONS
 627 #endif
 628
 629 #define BSS(bss_align)                                                  \
 630         . = ALIGN(bss_align);                                           \
 631         .bss : AT(ADDR(.bss) - LOAD_OFFSET) {                           \
 632                 BSS_FIRST_SECTIONS                                      \
 633                 . = ALIGN(PAGE_SIZE);                                   \
 634                 *(.bss..page_aligned)                                   \
 635                 . = ALIGN(PAGE_SIZE);                                   \
 636                 *(.dynbss)                                              \
 637                 *(BSS_MAIN)                                             \
 638                 *(COMMON)                                               \
 639         }
 640
 641 /*
 642  * DWARF debug sections.
 643  * Symbols in the DWARF debugging sections are relative to
 644  * the beginning of the section so we begin them at 0.
 645  */
 646 #define DWARF_DEBUG                                                     \
 647                 /* DWARF 1 */                                           \
 648                 .debug          0 : { *(.debug) }                       \
 649                 .line           0 : { *(.line) }                        \
 650                 /* GNU DWARF 1 extensions */                            \
 651                 .debug_srcinfo  0 : { *(.debug_srcinfo) }               \
 652                 .debug_sfnames  0 : { *(.debug_sfnames) }               \
 653                 /* DWARF 1.1 and DWARF 2 */                             \
 654                 .debug_aranges  0 : { *(.debug_aranges) }               \
 655                 .debug_pubnames 0 : { *(.debug_pubnames) }              \
 656                 /* DWARF 2 */                                           \
 657                 .debug_info     0 : { *(.debug_info                     \
 658                                 .gnu.linkonce.wi.*) }                   \
 659                 .debug_abbrev   0 : { *(.debug_abbrev) }                \
 660                 .debug_line     0 : { *(.debug_line) }                  \
 661                 .debug_frame    0 : { *(.debug_frame) }                 \
 662                 .debug_str      0 : { *(.debug_str) }                   \
 663                 .debug_loc      0 : { *(.debug_loc) }                   \
 664                 .debug_macinfo  0 : { *(.debug_macinfo) }               \
 665                 /* SGI/MIPS DWARF 2 extensions */                       \
 666                 .debug_weaknames 0 : { *(.debug_weaknames) }            \
 667                 .debug_funcnames 0 : { *(.debug_funcnames) }            \
 668                 .debug_typenames 0 : { *(.debug_typenames) }            \
 669                 .debug_varnames  0 : { *(.debug_varnames) }             \
 670
 671                 /* Stabs debugging sections.  */
 672 #define STABS_DEBUG                                                     \
 673                 .stab 0 : { *(.stab) }                                  \
 674                 .stabstr 0 : { *(.stabstr) }                            \
 675                 .stab.excl 0 : { *(.stab.excl) }                        \
 676                 .stab.exclstr 0 : { *(.stab.exclstr) }                  \
 677                 .stab.index 0 : { *(.stab.index) }                      \
 678                 .stab.indexstr 0 : { *(.stab.indexstr) }                \
 679                 .comment 0 : { *(.comment) }
 680
 681 #ifdef CONFIG_GENERIC_BUG
 682 #define BUG_TABLE                                                       \
 683         . = ALIGN(8);                                                   \
 684         __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {             \
 685                 VMLINUX_SYMBOL(__start___bug_table) = .;                \
 686                 *(__bug_table)                                          \
 687                 VMLINUX_SYMBOL(__stop___bug_table) = .;                 \
 688         }
 689 #else
 690 #define BUG_TABLE
 691 #endif
 692
 693 #ifdef CONFIG_PM_TRACE
 694 #define TRACEDATA                                                       \
 695         . = ALIGN(4);                                                   \
 696         .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {               \
 697                 VMLINUX_SYMBOL(__tracedata_start) = .;                  \
 698                 *(.tracedata)                                           \
 699                 VMLINUX_SYMBOL(__tracedata_end) = .;                    \
 700         }
 701 #else
 702 #define TRACEDATA
 703 #endif
 704
 705 #define NOTES                                                           \
 706         .notes : AT(ADDR(.notes) - LOAD_OFFSET) {                       \
 707                 VMLINUX_SYMBOL(__start_notes) = .;                      \
 708                 *(.note.*)                                              \
 709                 VMLINUX_SYMBOL(__stop_notes) = .;                       \
 710         }
 711
 712 #define INIT_SETUP(initsetup_align)                                     \
 713                 . = ALIGN(initsetup_align);                             \
 714                 VMLINUX_SYMBOL(__setup_start) = .;                      \
 715                 *(.init.setup)                                          \
 716                 VMLINUX_SYMBOL(__setup_end) = .;
 717
 718 #define INIT_CALLS_LEVEL(level)                                         \
 719                 VMLINUX_SYMBOL(__initcall##level##_start) = .;          \
 720                 KEEP(*(.initcall##level##.init))                        \
 721                 KEEP(*(.initcall##level##s.init))                       \
 722
 723 #define INIT_CALLS                                                      \
 724                 VMLINUX_SYMBOL(__initcall_start) = .;                   \
 725                 KEEP(*(.initcallearly.init))                            \
 726                 INIT_CALLS_LEVEL(0)                                     \
 727                 INIT_CALLS_LEVEL(1)                                     \
 728                 INIT_CALLS_LEVEL(2)                                     \
 729                 INIT_CALLS_LEVEL(3)                                     \
 730                 INIT_CALLS_LEVEL(4)                                     \
 731                 INIT_CALLS_LEVEL(5)                                     \
 732                 INIT_CALLS_LEVEL(rootfs)                                \
 733                 INIT_CALLS_LEVEL(6)                                     \
 734                 INIT_CALLS_LEVEL(7)                                     \
 735                 VMLINUX_SYMBOL(__initcall_end) = .;
 736
 737 #define CON_INITCALL                                                    \
 738                 VMLINUX_SYMBOL(__con_initcall_start) = .;               \
 739                 KEEP(*(.con_initcall.init))                             \
 740                 VMLINUX_SYMBOL(__con_initcall_end) = .;
 741
 742 #define SECURITY_INITCALL                                               \
 743                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 744                 KEEP(*(.security_initcall.init))                        \
 745                 VMLINUX_SYMBOL(__security_initcall_end) = .;
 746
 747 #ifdef CONFIG_BLK_DEV_INITRD
 748 #define INIT_RAM_FS                                                     \
 749         . = ALIGN(4);                                                   \
 750         VMLINUX_SYMBOL(__initramfs_start) = .;                          \
 751         KEEP(*(.init.ramfs))                                            \
 752         . = ALIGN(8);                                                   \
 753         KEEP(*(.init.ramfs.info))
 754 #else
 755 #define INIT_RAM_FS
 756 #endif
 757
 758 /*
 759  * Default discarded sections.
 760  *
 761  * Some archs want to discard exit text/data at runtime rather than
 762  * link time due to cross-section references such as alt instructions,
 763  * bug table, eh_frame, etc.  DISCARDS must be the last of output
 764  * section definitions so that such archs put those in earlier section
 765  * definitions.
 766  */
 767 #define DISCARDS                                                        \
 768         /DISCARD/ : {                                                   \
 769         EXIT_TEXT                                                       \
 770         EXIT_DATA                                                       \
 771         EXIT_CALL                                                       \
 772         *(.discard)                                                     \
 773         *(.discard.*)                                                   \
 774         }
 775
 776 /**
 777  * PERCPU_INPUT - the percpu input sections
 778  * @cacheline: cacheline size
 779  *
 780  * The core percpu section names and core symbols which do not rely
 781  * directly upon load addresses.
 782  *
 783  * @cacheline is used to align subsections to avoid false cacheline
 784  * sharing between subsections for different purposes.
 785  */
 786 #define PERCPU_INPUT(cacheline)                                         \
 787         VMLINUX_SYMBOL(__per_cpu_start) = .;                            \
 788         VMLINUX_SYMBOL(__per_cpu_user_mapped_start) = .;                \
 789         *(.data..percpu..first)                                         \
 790         . = ALIGN(cacheline);                                           \
 791         *(.data..percpu..user_mapped)                                   \
 792         *(.data..percpu..user_mapped..shared_aligned)                   \
 793         . = ALIGN(PAGE_SIZE);                                           \
 794         *(.data..percpu..user_mapped..page_aligned)                     \
 795         VMLINUX_SYMBOL(__per_cpu_user_mapped_end) = .;                  \
 796         . = ALIGN(PAGE_SIZE);                                           \
 797         *(.data..percpu..page_aligned)                                  \
 798         . = ALIGN(cacheline);                                           \
 799         *(.data..percpu..read_mostly)                                   \
 800         . = ALIGN(cacheline);                                           \
 801         *(.data..percpu)                                                \
 802         *(.data..percpu..shared_aligned)                                \
 803         VMLINUX_SYMBOL(__per_cpu_end) = .;
 804
 805 /**
 806  * PERCPU_VADDR - define output section for percpu area
 807  * @cacheline: cacheline size
 808  * @vaddr: explicit base address (optional)
 809  * @phdr: destination PHDR (optional)
 810  *
 811  * Macro which expands to output section for percpu area.
 812  *
 813  * @cacheline is used to align subsections to avoid false cacheline
 814  * sharing between subsections for different purposes.
 815  *
 816  * If @vaddr is not blank, it specifies explicit base address and all
 817  * percpu symbols will be offset from the given address.  If blank,
 818  * @vaddr always equals @laddr + LOAD_OFFSET.
 819  *
 820  * @phdr defines the output PHDR to use if not blank.  Be warned that
 821  * output PHDR is sticky.  If @phdr is specified, the next output
 822  * section in the linker script will go there too.  @phdr should have
 823  * a leading colon.
 824  *
 825  * Note that this macros defines __per_cpu_load as an absolute symbol.
 826  * If there is no need to put the percpu section at a predetermined
 827  * address, use PERCPU_SECTION.
 828  */
 829 #define PERCPU_VADDR(cacheline, vaddr, phdr)                            \
 830         VMLINUX_SYMBOL(__per_cpu_load) = .;                             \
 831         .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load)         \
 832                                 - LOAD_OFFSET) {                        \
 833                 PERCPU_INPUT(cacheline)                                 \
 834         } phdr                                                          \
 835         . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
 836
 837 /**
 838  * PERCPU_SECTION - define output section for percpu area, simple version
 839  * @cacheline: cacheline size
 840  *
 841  * Align to PAGE_SIZE and outputs output section for percpu area.  This
 842  * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
 843  * __per_cpu_start will be identical.
 844  *
 845  * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
 846  * except that __per_cpu_load is defined as a relative symbol against
 847  * .data..percpu which is required for relocatable x86_32 configuration.
 848  */
 849 #define PERCPU_SECTION(cacheline)                                       \
 850         . = ALIGN(PAGE_SIZE);                                           \
 851         .data..percpu   : AT(ADDR(.data..percpu) - LOAD_OFFSET) {       \
 852                 VMLINUX_SYMBOL(__per_cpu_load) = .;                     \
 853                 PERCPU_INPUT(cacheline)                                 \
 854         }
 855
 856
 857 /*
 858  * Definition of the high level *_SECTION macros
 859  * They will fit only a subset of the architectures
 860  */
 861
 862
 863 /*
 864  * Writeable data.
 865  * All sections are combined in a single .data section.
 866  * The sections following CONSTRUCTORS are arranged so their
 867  * typical alignment matches.
 868  * A cacheline is typical/always less than a PAGE_SIZE so
 869  * the sections that has this restriction (or similar)
 870  * is located before the ones requiring PAGE_SIZE alignment.
 871  * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
 872  * matches the requirement of PAGE_ALIGNED_DATA.
 873  *
 874  * use 0 as page_align if page_aligned data is not used */
 875 #define RW_DATA_SECTION(cacheline, pagealigned, inittask)               \
 876         . = ALIGN(PAGE_SIZE);                                           \
 877         .data : AT(ADDR(.data) - LOAD_OFFSET) {                         \
 878                 INIT_TASK_DATA(inittask)                                \
 879                 NOSAVE_DATA                                             \
 880                 PAGE_ALIGNED_DATA(pagealigned)                          \
 881                 CACHELINE_ALIGNED_DATA(cacheline)                       \
 882                 READ_MOSTLY_DATA(cacheline)                             \
 883                 DATA_DATA                                               \
 884                 CONSTRUCTORS                                            \
 885         }
 886
 887 #define INIT_TEXT_SECTION(inittext_align)                               \
 888         . = ALIGN(inittext_align);                                      \
 889         .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {               \
 890                 VMLINUX_SYMBOL(_sinittext) = .;                         \
 891                 INIT_TEXT                                               \
 892                 VMLINUX_SYMBOL(_einittext) = .;                         \
 893         }
 894
 895 #define INIT_DATA_SECTION(initsetup_align)                              \
 896         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {               \
 897                 INIT_DATA                                               \
 898                 INIT_SETUP(initsetup_align)                             \
 899                 INIT_CALLS                                              \
 900                 CON_INITCALL                                            \
 901                 SECURITY_INITCALL                                       \
 902                 INIT_RAM_FS                                             \
 903         }
 904
 905 #define BSS_SECTION(sbss_align, bss_align, stop_align)                  \
 906         . = ALIGN(sbss_align);                                          \
 907         VMLINUX_SYMBOL(__bss_start) = .;                                \
 908         SBSS(sbss_align)                                                \
 909         BSS(bss_align)                                                  \
 910         . = ALIGN(stop_align);                                          \
 911         VMLINUX_SYMBOL(__bss_stop) = .;