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                                 KEEP(*(_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                         KEEP(*(_ftrace_events))                         \
 143                         VMLINUX_SYMBOL(__stop_ftrace_events) = .;       \
 144                         VMLINUX_SYMBOL(__start_ftrace_eval_maps) = .;   \
 145                         KEEP(*(_ftrace_eval_map))                       \
 146                         VMLINUX_SYMBOL(__stop_ftrace_eval_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                          KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \
 154                          VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;
 155 #define TRACEPOINT_STR() VMLINUX_SYMBOL(__start___tracepoint_str) = .;  \
 156                          KEEP(*(__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                          KEEP(*(__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() STRUCT_ALIGN();                        \
 174                          VMLINUX_SYMBOL(__earlycon_table) = .;  \
 175                          KEEP(*(__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         KEEP(*(__##name##_of_table))                                    \
 189         KEEP(*(__##name##_of_table_end))
 190
 191 #define TIMER_OF_TABLES()       OF_TABLE(CONFIG_TIMER_OF, timer)
 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         KEEP(*(__##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         KEEP(*(.dtb.init.rodata))                                       \
 213         VMLINUX_SYMBOL(__dtb_end) = .;
 214
 215 /*
 216  * .data section
 217  */
 218 #define DATA_DATA                                                       \
 219         *(.xiptext)                                                     \
 220         *(DATA_MAIN)                                                    \
 221         *(.ref.data)                                                    \
 222         *(.data..shared_aligned) /* percpu related */                   \
 223         MEM_KEEP(init.data)                                             \
 224         MEM_KEEP(exit.data)                                             \
 225         *(.data.unlikely)                                               \
 226         STRUCT_ALIGN();                                                 \
 227         *(__tracepoints)                                                \
 228         /* implement dynamic printk debug */                            \
 229         . = ALIGN(8);                                                   \
 230         VMLINUX_SYMBOL(__start___jump_table) = .;                       \
 231         KEEP(*(__jump_table))                                           \
 232         VMLINUX_SYMBOL(__stop___jump_table) = .;                        \
 233         . = ALIGN(8);                                                   \
 234         VMLINUX_SYMBOL(__start___verbose) = .;                          \
 235         KEEP(*(__verbose))                                              \
 236         VMLINUX_SYMBOL(__stop___verbose) = .;                           \
 237         LIKELY_PROFILE()                                                \
 238         BRANCH_PROFILE()                                                \
 239         TRACE_PRINTKS()                                                 \
 240         TRACEPOINT_STR()
 241
 242 /*
 243  * Data section helpers
 244  */
 245 #define NOSAVE_DATA                                                     \
 246         . = ALIGN(PAGE_SIZE);                                           \
 247         VMLINUX_SYMBOL(__nosave_begin) = .;                             \
 248         *(.data..nosave)                                                \
 249         . = ALIGN(PAGE_SIZE);                                           \
 250         VMLINUX_SYMBOL(__nosave_end) = .;
 251
 252 #define PAGE_ALIGNED_DATA(page_align)                                   \
 253         . = ALIGN(page_align);                                          \
 254         *(.data..page_aligned)
 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         VMLINUX_SYMBOL(__start_ro_after_init) = .;                      \
 278         *(.data..ro_after_init)                                         \
 279         VMLINUX_SYMBOL(__end_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                 KEEP(*(__vermagic))     /* Kernel version magic */      \
 292                 . = ALIGN(8);                                           \
 293                 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .;         \
 294                 KEEP(*(__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         /* PCI quirks */                                                \
 304         .pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {        \
 305                 VMLINUX_SYMBOL(__start_pci_fixups_early) = .;           \
 306                 KEEP(*(.pci_fixup_early))                               \
 307                 VMLINUX_SYMBOL(__end_pci_fixups_early) = .;             \
 308                 VMLINUX_SYMBOL(__start_pci_fixups_header) = .;          \
 309                 KEEP(*(.pci_fixup_header))                              \
 310                 VMLINUX_SYMBOL(__end_pci_fixups_header) = .;            \
 311                 VMLINUX_SYMBOL(__start_pci_fixups_final) = .;           \
 312                 KEEP(*(.pci_fixup_final))                               \
 313                 VMLINUX_SYMBOL(__end_pci_fixups_final) = .;             \
 314                 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .;          \
 315                 KEEP(*(.pci_fixup_enable))                              \
 316                 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .;            \
 317                 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .;          \
 318                 KEEP(*(.pci_fixup_resume))                              \
 319                 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .;            \
 320                 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .;    \
 321                 KEEP(*(.pci_fixup_resume_early))                        \
 322                 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .;      \
 323                 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .;         \
 324                 KEEP(*(.pci_fixup_suspend))                             \
 325                 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .;           \
 326                 VMLINUX_SYMBOL(__start_pci_fixups_suspend_late) = .;    \
 327                 KEEP(*(.pci_fixup_suspend_late))                        \
 328                 VMLINUX_SYMBOL(__end_pci_fixups_suspend_late) = .;      \
 329         }                                                               \
 330                                                                         \
 331         /* Built-in firmware blobs */                                   \
 332         .builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {      \
 333                 VMLINUX_SYMBOL(__start_builtin_fw) = .;                 \
 334                 KEEP(*(.builtin_fw))                                    \
 335                 VMLINUX_SYMBOL(__end_builtin_fw) = .;                   \
 336         }                                                               \
 337                                                                         \
 338         TRACEDATA                                                       \
 339                                                                         \
 340         /* Kernel symbol table: Normal symbols */                       \
 341         __ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {         \
 342                 VMLINUX_SYMBOL(__start___ksymtab) = .;                  \
 343                 KEEP(*(SORT(___ksymtab+*)))                             \
 344                 VMLINUX_SYMBOL(__stop___ksymtab) = .;                   \
 345         }                                                               \
 346                                                                         \
 347         /* Kernel symbol table: GPL-only symbols */                     \
 348         __ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {     \
 349                 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .;              \
 350                 KEEP(*(SORT(___ksymtab_gpl+*)))                         \
 351                 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .;               \
 352         }                                                               \
 353                                                                         \
 354         /* Kernel symbol table: Normal unused symbols */                \
 355         __ksymtab_unused  : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) {  \
 356                 VMLINUX_SYMBOL(__start___ksymtab_unused) = .;           \
 357                 KEEP(*(SORT(___ksymtab_unused+*)))                      \
 358                 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .;            \
 359         }                                                               \
 360                                                                         \
 361         /* Kernel symbol table: GPL-only unused symbols */              \
 362         __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
 363                 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .;       \
 364                 KEEP(*(SORT(___ksymtab_unused_gpl+*)))                  \
 365                 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .;        \
 366         }                                                               \
 367                                                                         \
 368         /* Kernel symbol table: GPL-future-only symbols */              \
 369         __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
 370                 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .;       \
 371                 KEEP(*(SORT(___ksymtab_gpl_future+*)))                  \
 372                 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .;        \
 373         }                                                               \
 374                                                                         \
 375         /* Kernel symbol table: Normal symbols */                       \
 376         __kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {         \
 377                 VMLINUX_SYMBOL(__start___kcrctab) = .;                  \
 378                 KEEP(*(SORT(___kcrctab+*)))                             \
 379                 VMLINUX_SYMBOL(__stop___kcrctab) = .;                   \
 380         }                                                               \
 381                                                                         \
 382         /* Kernel symbol table: GPL-only symbols */                     \
 383         __kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {     \
 384                 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .;              \
 385                 KEEP(*(SORT(___kcrctab_gpl+*)))                         \
 386                 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .;               \
 387         }                                                               \
 388                                                                         \
 389         /* Kernel symbol table: Normal unused symbols */                \
 390         __kcrctab_unused  : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) {  \
 391                 VMLINUX_SYMBOL(__start___kcrctab_unused) = .;           \
 392                 KEEP(*(SORT(___kcrctab_unused+*)))                      \
 393                 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .;            \
 394         }                                                               \
 395                                                                         \
 396         /* Kernel symbol table: GPL-only unused symbols */              \
 397         __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
 398                 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .;       \
 399                 KEEP(*(SORT(___kcrctab_unused_gpl+*)))                  \
 400                 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .;        \
 401         }                                                               \
 402                                                                         \
 403         /* Kernel symbol table: GPL-future-only symbols */              \
 404         __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
 405                 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .;       \
 406                 KEEP(*(SORT(___kcrctab_gpl_future+*)))                  \
 407                 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .;        \
 408         }                                                               \
 409                                                                         \
 410         /* Kernel symbol table: strings */                              \
 411         __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
 412                 *(__ksymtab_strings)                                    \
 413         }                                                               \
 414                                                                         \
 415         /* __*init sections */                                          \
 416         __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {         \
 417                 *(.ref.rodata)                                          \
 418                 MEM_KEEP(init.rodata)                                   \
 419                 MEM_KEEP(exit.rodata)                                   \
 420         }                                                               \
 421                                                                         \
 422         /* Built-in module parameters. */                               \
 423         __param : AT(ADDR(__param) - LOAD_OFFSET) {                     \
 424                 VMLINUX_SYMBOL(__start___param) = .;                    \
 425                 KEEP(*(__param))                                        \
 426                 VMLINUX_SYMBOL(__stop___param) = .;                     \
 427         }                                                               \
 428                                                                         \
 429         /* Built-in module versions. */                                 \
 430         __modver : AT(ADDR(__modver) - LOAD_OFFSET) {                   \
 431                 VMLINUX_SYMBOL(__start___modver) = .;                   \
 432                 KEEP(*(__modver))                                       \
 433                 VMLINUX_SYMBOL(__stop___modver) = .;                    \
 434                 . = ALIGN((align));                                     \
 435                 VMLINUX_SYMBOL(__end_rodata) = .;                       \
 436         }                                                               \
 437         . = ALIGN((align));
 438
 439 /* RODATA & RO_DATA provided for backward compatibility.
 440  * All archs are supposed to use RO_DATA() */
 441 #define RODATA          RO_DATA_SECTION(4096)
 442 #define RO_DATA(align)  RO_DATA_SECTION(align)
 443
 444 #define SECURITY_INIT                                                   \
 445         .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
 446                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 447                 KEEP(*(.security_initcall.init))                        \
 448                 VMLINUX_SYMBOL(__security_initcall_end) = .;            \
 449         }
 450
 451 /*
 452  * .text section. Map to function alignment to avoid address changes
 453  * during second ld run in second ld pass when generating System.map
 454  *
 455  * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead
 456  * code elimination is enabled, so these sections should be converted
 457  * to use ".." first.
 458  */
 459 #define TEXT_TEXT                                                       \
 460                 ALIGN_FUNCTION();                                       \
 461                 *(.text.hot TEXT_MAIN .text.fixup .text.unlikely)       \
 462                 *(.ref.text)                                            \
 463         MEM_KEEP(init.text)                                             \
 464         MEM_KEEP(exit.text)                                             \
 465
 466
 467 /* sched.text is aling to function alignment to secure we have same
 468  * address even at second ld pass when generating System.map */
 469 #define SCHED_TEXT                                                      \
 470                 ALIGN_FUNCTION();                                       \
 471                 VMLINUX_SYMBOL(__sched_text_start) = .;                 \
 472                 *(.sched.text)                                          \
 473                 VMLINUX_SYMBOL(__sched_text_end) = .;
 474
 475 /* spinlock.text is aling to function alignment to secure we have same
 476  * address even at second ld pass when generating System.map */
 477 #define LOCK_TEXT                                                       \
 478                 ALIGN_FUNCTION();                                       \
 479                 VMLINUX_SYMBOL(__lock_text_start) = .;                  \
 480                 *(.spinlock.text)                                       \
 481                 VMLINUX_SYMBOL(__lock_text_end) = .;
 482
 483 #define CPUIDLE_TEXT                                                    \
 484                 ALIGN_FUNCTION();                                       \
 485                 VMLINUX_SYMBOL(__cpuidle_text_start) = .;               \
 486                 *(.cpuidle.text)                                        \
 487                 VMLINUX_SYMBOL(__cpuidle_text_end) = .;
 488
 489 #define KPROBES_TEXT                                                    \
 490                 ALIGN_FUNCTION();                                       \
 491                 VMLINUX_SYMBOL(__kprobes_text_start) = .;               \
 492                 *(.kprobes.text)                                        \
 493                 VMLINUX_SYMBOL(__kprobes_text_end) = .;
 494
 495 #define ENTRY_TEXT                                                      \
 496                 ALIGN_FUNCTION();                                       \
 497                 VMLINUX_SYMBOL(__entry_text_start) = .;                 \
 498                 *(.entry.text)                                          \
 499                 VMLINUX_SYMBOL(__entry_text_end) = .;
 500
 501 #define IRQENTRY_TEXT                                                   \
 502                 ALIGN_FUNCTION();                                       \
 503                 VMLINUX_SYMBOL(__irqentry_text_start) = .;              \
 504                 *(.irqentry.text)                                       \
 505                 VMLINUX_SYMBOL(__irqentry_text_end) = .;
 506
 507 #define SOFTIRQENTRY_TEXT                                               \
 508                 ALIGN_FUNCTION();                                       \
 509                 VMLINUX_SYMBOL(__softirqentry_text_start) = .;          \
 510                 *(.softirqentry.text)                                   \
 511                 VMLINUX_SYMBOL(__softirqentry_text_end) = .;
 512
 513 /* Section used for early init (in .S files) */
 514 #define HEAD_TEXT  *(.head.text)
 515
 516 #define HEAD_TEXT_SECTION                                                       \
 517         .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {               \
 518                 HEAD_TEXT                                               \
 519         }
 520
 521 /*
 522  * Exception table
 523  */
 524 #define EXCEPTION_TABLE(align)                                          \
 525         . = ALIGN(align);                                               \
 526         __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {               \
 527                 VMLINUX_SYMBOL(__start___ex_table) = .;                 \
 528                 KEEP(*(__ex_table))                                     \
 529                 VMLINUX_SYMBOL(__stop___ex_table) = .;                  \
 530         }
 531
 532 /*
 533  * Init task
 534  */
 535 #define INIT_TASK_DATA_SECTION(align)                                   \
 536         . = ALIGN(align);                                               \
 537         .data..init_task :  AT(ADDR(.data..init_task) - LOAD_OFFSET) {  \
 538                 INIT_TASK_DATA(align)                                   \
 539         }
 540
 541 #ifdef CONFIG_CONSTRUCTORS
 542 #define KERNEL_CTORS()  . = ALIGN(8);                      \
 543                         VMLINUX_SYMBOL(__ctors_start) = .; \
 544                         KEEP(*(.ctors))                    \
 545                         KEEP(*(SORT(.init_array.*)))       \
 546                         KEEP(*(.init_array))               \
 547                         VMLINUX_SYMBOL(__ctors_end) = .;
 548 #else
 549 #define KERNEL_CTORS()
 550 #endif
 551
 552 /* init and exit section handling */
 553 #define INIT_DATA                                                       \
 554         KEEP(*(SORT(___kentry+*)))                                      \
 555         *(.init.data)                                                   \
 556         MEM_DISCARD(init.data)                                          \
 557         KERNEL_CTORS()                                                  \
 558         MCOUNT_REC()                                                    \
 559         *(.init.rodata)                                                 \
 560         FTRACE_EVENTS()                                                 \
 561         TRACE_SYSCALLS()                                                \
 562         KPROBE_BLACKLIST()                                              \
 563         MEM_DISCARD(init.rodata)                                        \
 564         CLK_OF_TABLES()                                                 \
 565         RESERVEDMEM_OF_TABLES()                                         \
 566         TIMER_OF_TABLES()                                               \
 567         IOMMU_OF_TABLES()                                               \
 568         CPU_METHOD_OF_TABLES()                                          \
 569         CPUIDLE_METHOD_OF_TABLES()                                      \
 570         KERNEL_DTB()                                                    \
 571         IRQCHIP_OF_MATCH_TABLE()                                        \
 572         ACPI_PROBE_TABLE(irqchip)                                       \
 573         ACPI_PROBE_TABLE(timer)                                         \
 574         ACPI_PROBE_TABLE(iort)                                          \
 575         EARLYCON_TABLE()
 576
 577 #define INIT_TEXT                                                       \
 578         *(.init.text)                                                   \
 579         *(.text.startup)                                                \
 580         MEM_DISCARD(init.text)
 581
 582 #define EXIT_DATA                                                       \
 583         *(.exit.data)                                                   \
 584         *(.fini_array)                                                  \
 585         *(.dtors)                                                       \
 586         MEM_DISCARD(exit.data)                                          \
 587         MEM_DISCARD(exit.rodata)
 588
 589 #define EXIT_TEXT                                                       \
 590         *(.exit.text)                                                   \
 591         *(.text.exit)                                                   \
 592         MEM_DISCARD(exit.text)
 593
 594 #define EXIT_CALL                                                       \
 595         *(.exitcall.exit)
 596
 597 /*
 598  * bss (Block Started by Symbol) - uninitialized data
 599  * zeroed during startup
 600  */
 601 #define SBSS(sbss_align)                                                \
 602         . = ALIGN(sbss_align);                                          \
 603         .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {                         \
 604                 *(.dynsbss)                                             \
 605                 *(.sbss)                                                \
 606                 *(.scommon)                                             \
 607         }
 608
 609 /*
 610  * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
 611  * sections to the front of bss.
 612  */
 613 #ifndef BSS_FIRST_SECTIONS
 614 #define BSS_FIRST_SECTIONS
 615 #endif
 616
 617 #define BSS(bss_align)                                                  \
 618         . = ALIGN(bss_align);                                           \
 619         .bss : AT(ADDR(.bss) - LOAD_OFFSET) {                           \
 620                 BSS_FIRST_SECTIONS                                      \
 621                 *(.bss..page_aligned)                                   \
 622                 *(.dynbss)                                              \
 623                 *(BSS_MAIN)                                             \
 624                 *(COMMON)                                               \
 625         }
 626
 627 /*
 628  * DWARF debug sections.
 629  * Symbols in the DWARF debugging sections are relative to
 630  * the beginning of the section so we begin them at 0.
 631  */
 632 #define DWARF_DEBUG                                                     \
 633                 /* DWARF 1 */                                           \
 634                 .debug          0 : { *(.debug) }                       \
 635                 .line           0 : { *(.line) }                        \
 636                 /* GNU DWARF 1 extensions */                            \
 637                 .debug_srcinfo  0 : { *(.debug_srcinfo) }               \
 638                 .debug_sfnames  0 : { *(.debug_sfnames) }               \
 639                 /* DWARF 1.1 and DWARF 2 */                             \
 640                 .debug_aranges  0 : { *(.debug_aranges) }               \
 641                 .debug_pubnames 0 : { *(.debug_pubnames) }              \
 642                 /* DWARF 2 */                                           \
 643                 .debug_info     0 : { *(.debug_info                     \
 644                                 .gnu.linkonce.wi.*) }                   \
 645                 .debug_abbrev   0 : { *(.debug_abbrev) }                \
 646                 .debug_line     0 : { *(.debug_line) }                  \
 647                 .debug_frame    0 : { *(.debug_frame) }                 \
 648                 .debug_str      0 : { *(.debug_str) }                   \
 649                 .debug_loc      0 : { *(.debug_loc) }                   \
 650                 .debug_macinfo  0 : { *(.debug_macinfo) }               \
 651                 .debug_pubtypes 0 : { *(.debug_pubtypes) }              \
 652                 /* DWARF 3 */                                           \
 653                 .debug_ranges   0 : { *(.debug_ranges) }                \
 654                 /* SGI/MIPS DWARF 2 extensions */                       \
 655                 .debug_weaknames 0 : { *(.debug_weaknames) }            \
 656                 .debug_funcnames 0 : { *(.debug_funcnames) }            \
 657                 .debug_typenames 0 : { *(.debug_typenames) }            \
 658                 .debug_varnames  0 : { *(.debug_varnames) }             \
 659                 /* GNU DWARF 2 extensions */                            \
 660                 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) }      \
 661                 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) }      \
 662                 /* DWARF 4 */                                           \
 663                 .debug_types    0 : { *(.debug_types) }                 \
 664                 /* DWARF 5 */                                           \
 665                 .debug_macro    0 : { *(.debug_macro) }                 \
 666                 .debug_addr     0 : { *(.debug_addr) }
 667
 668                 /* Stabs debugging sections.  */
 669 #define STABS_DEBUG                                                     \
 670                 .stab 0 : { *(.stab) }                                  \
 671                 .stabstr 0 : { *(.stabstr) }                            \
 672                 .stab.excl 0 : { *(.stab.excl) }                        \
 673                 .stab.exclstr 0 : { *(.stab.exclstr) }                  \
 674                 .stab.index 0 : { *(.stab.index) }                      \
 675                 .stab.indexstr 0 : { *(.stab.indexstr) }                \
 676                 .comment 0 : { *(.comment) }
 677
 678 #ifdef CONFIG_GENERIC_BUG
 679 #define BUG_TABLE                                                       \
 680         . = ALIGN(8);                                                   \
 681         __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {             \
 682                 VMLINUX_SYMBOL(__start___bug_table) = .;                \
 683                 KEEP(*(__bug_table))                                    \
 684                 VMLINUX_SYMBOL(__stop___bug_table) = .;                 \
 685         }
 686 #else
 687 #define BUG_TABLE
 688 #endif
 689
 690 #ifdef CONFIG_ORC_UNWINDER
 691 #define ORC_UNWIND_TABLE                                                \
 692         . = ALIGN(4);                                                   \
 693         .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) {       \
 694                 VMLINUX_SYMBOL(__start_orc_unwind_ip) = .;              \
 695                 KEEP(*(.orc_unwind_ip))                                 \
 696                 VMLINUX_SYMBOL(__stop_orc_unwind_ip) = .;               \
 697         }                                                               \
 698         . = ALIGN(6);                                                   \
 699         .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) {             \
 700                 VMLINUX_SYMBOL(__start_orc_unwind) = .;                 \
 701                 KEEP(*(.orc_unwind))                                    \
 702                 VMLINUX_SYMBOL(__stop_orc_unwind) = .;                  \
 703         }                                                               \
 704         . = ALIGN(4);                                                   \
 705         .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) {             \
 706                 VMLINUX_SYMBOL(orc_lookup) = .;                         \
 707                 . += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) /        \
 708                         LOOKUP_BLOCK_SIZE) + 1) * 4;                    \
 709                 VMLINUX_SYMBOL(orc_lookup_end) = .;                     \
 710         }
 711 #else
 712 #define ORC_UNWIND_TABLE
 713 #endif
 714
 715 #ifdef CONFIG_PM_TRACE
 716 #define TRACEDATA                                                       \
 717         . = ALIGN(4);                                                   \
 718         .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {               \
 719                 VMLINUX_SYMBOL(__tracedata_start) = .;                  \
 720                 KEEP(*(.tracedata))                                     \
 721                 VMLINUX_SYMBOL(__tracedata_end) = .;                    \
 722         }
 723 #else
 724 #define TRACEDATA
 725 #endif
 726
 727 #define NOTES                                                           \
 728         .notes : AT(ADDR(.notes) - LOAD_OFFSET) {                       \
 729                 VMLINUX_SYMBOL(__start_notes) = .;                      \
 730                 *(.note.*)                                              \
 731                 VMLINUX_SYMBOL(__stop_notes) = .;                       \
 732         }
 733
 734 #define INIT_SETUP(initsetup_align)                                     \
 735                 . = ALIGN(initsetup_align);                             \
 736                 VMLINUX_SYMBOL(__setup_start) = .;                      \
 737                 KEEP(*(.init.setup))                                    \
 738                 VMLINUX_SYMBOL(__setup_end) = .;
 739
 740 #define INIT_CALLS_LEVEL(level)                                         \
 741                 VMLINUX_SYMBOL(__initcall##level##_start) = .;          \
 742                 KEEP(*(.initcall##level##.init))                        \
 743                 KEEP(*(.initcall##level##s.init))                       \
 744
 745 #define INIT_CALLS                                                      \
 746                 VMLINUX_SYMBOL(__initcall_start) = .;                   \
 747                 KEEP(*(.initcallearly.init))                            \
 748                 INIT_CALLS_LEVEL(0)                                     \
 749                 INIT_CALLS_LEVEL(1)                                     \
 750                 INIT_CALLS_LEVEL(2)                                     \
 751                 INIT_CALLS_LEVEL(3)                                     \
 752                 INIT_CALLS_LEVEL(4)                                     \
 753                 INIT_CALLS_LEVEL(5)                                     \
 754                 INIT_CALLS_LEVEL(rootfs)                                \
 755                 INIT_CALLS_LEVEL(6)                                     \
 756                 INIT_CALLS_LEVEL(7)                                     \
 757                 VMLINUX_SYMBOL(__initcall_end) = .;
 758
 759 #define CON_INITCALL                                                    \
 760                 VMLINUX_SYMBOL(__con_initcall_start) = .;               \
 761                 KEEP(*(.con_initcall.init))                             \
 762                 VMLINUX_SYMBOL(__con_initcall_end) = .;
 763
 764 #define SECURITY_INITCALL                                               \
 765                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 766                 KEEP(*(.security_initcall.init))                        \
 767                 VMLINUX_SYMBOL(__security_initcall_end) = .;
 768
 769 #ifdef CONFIG_BLK_DEV_INITRD
 770 #define INIT_RAM_FS                                                     \
 771         . = ALIGN(4);                                                   \
 772         VMLINUX_SYMBOL(__initramfs_start) = .;                          \
 773         KEEP(*(.init.ramfs))                                            \
 774         . = ALIGN(8);                                                   \
 775         KEEP(*(.init.ramfs.info))
 776 #else
 777 #define INIT_RAM_FS
 778 #endif
 779
 780 /*
 781  * Default discarded sections.
 782  *
 783  * Some archs want to discard exit text/data at runtime rather than
 784  * link time due to cross-section references such as alt instructions,
 785  * bug table, eh_frame, etc.  DISCARDS must be the last of output
 786  * section definitions so that such archs put those in earlier section
 787  * definitions.
 788  */
 789 #define DISCARDS                                                        \
 790         /DISCARD/ : {                                                   \
 791         EXIT_TEXT                                                       \
 792         EXIT_DATA                                                       \
 793         EXIT_CALL                                                       \
 794         *(.discard)                                                     \
 795         *(.discard.*)                                                   \
 796         }
 797
 798 /**
 799  * PERCPU_INPUT - the percpu input sections
 800  * @cacheline: cacheline size
 801  *
 802  * The core percpu section names and core symbols which do not rely
 803  * directly upon load addresses.
 804  *
 805  * @cacheline is used to align subsections to avoid false cacheline
 806  * sharing between subsections for different purposes.
 807  */
 808 #define PERCPU_INPUT(cacheline)                                         \
 809         VMLINUX_SYMBOL(__per_cpu_start) = .;                            \
 810         *(.data..percpu..first)                                         \
 811         . = ALIGN(PAGE_SIZE);                                           \
 812         *(.data..percpu..page_aligned)                                  \
 813         . = ALIGN(cacheline);                                           \
 814         *(.data..percpu..read_mostly)                                   \
 815         . = ALIGN(cacheline);                                           \
 816         *(.data..percpu)                                                \
 817         *(.data..percpu..shared_aligned)                                \
 818         VMLINUX_SYMBOL(__per_cpu_end) = .;
 819
 820 /**
 821  * PERCPU_VADDR - define output section for percpu area
 822  * @cacheline: cacheline size
 823  * @vaddr: explicit base address (optional)
 824  * @phdr: destination PHDR (optional)
 825  *
 826  * Macro which expands to output section for percpu area.
 827  *
 828  * @cacheline is used to align subsections to avoid false cacheline
 829  * sharing between subsections for different purposes.
 830  *
 831  * If @vaddr is not blank, it specifies explicit base address and all
 832  * percpu symbols will be offset from the given address.  If blank,
 833  * @vaddr always equals @laddr + LOAD_OFFSET.
 834  *
 835  * @phdr defines the output PHDR to use if not blank.  Be warned that
 836  * output PHDR is sticky.  If @phdr is specified, the next output
 837  * section in the linker script will go there too.  @phdr should have
 838  * a leading colon.
 839  *
 840  * Note that this macros defines __per_cpu_load as an absolute symbol.
 841  * If there is no need to put the percpu section at a predetermined
 842  * address, use PERCPU_SECTION.
 843  */
 844 #define PERCPU_VADDR(cacheline, vaddr, phdr)                            \
 845         VMLINUX_SYMBOL(__per_cpu_load) = .;                             \
 846         .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load)         \
 847                                 - LOAD_OFFSET) {                        \
 848                 PERCPU_INPUT(cacheline)                                 \
 849         } phdr                                                          \
 850         . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
 851
 852 /**
 853  * PERCPU_SECTION - define output section for percpu area, simple version
 854  * @cacheline: cacheline size
 855  *
 856  * Align to PAGE_SIZE and outputs output section for percpu area.  This
 857  * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
 858  * __per_cpu_start will be identical.
 859  *
 860  * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
 861  * except that __per_cpu_load is defined as a relative symbol against
 862  * .data..percpu which is required for relocatable x86_32 configuration.
 863  */
 864 #define PERCPU_SECTION(cacheline)                                       \
 865         . = ALIGN(PAGE_SIZE);                                           \
 866         .data..percpu   : AT(ADDR(.data..percpu) - LOAD_OFFSET) {       \
 867                 VMLINUX_SYMBOL(__per_cpu_load) = .;                     \
 868                 PERCPU_INPUT(cacheline)                                 \
 869         }
 870
 871
 872 /*
 873  * Definition of the high level *_SECTION macros
 874  * They will fit only a subset of the architectures
 875  */
 876
 877
 878 /*
 879  * Writeable data.
 880  * All sections are combined in a single .data section.
 881  * The sections following CONSTRUCTORS are arranged so their
 882  * typical alignment matches.
 883  * A cacheline is typical/always less than a PAGE_SIZE so
 884  * the sections that has this restriction (or similar)
 885  * is located before the ones requiring PAGE_SIZE alignment.
 886  * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
 887  * matches the requirement of PAGE_ALIGNED_DATA.
 888  *
 889  * use 0 as page_align if page_aligned data is not used */
 890 #define RW_DATA_SECTION(cacheline, pagealigned, inittask)               \
 891         . = ALIGN(PAGE_SIZE);                                           \
 892         .data : AT(ADDR(.data) - LOAD_OFFSET) {                         \
 893                 INIT_TASK_DATA(inittask)                                \
 894                 NOSAVE_DATA                                             \
 895                 PAGE_ALIGNED_DATA(pagealigned)                          \
 896                 CACHELINE_ALIGNED_DATA(cacheline)                       \
 897                 READ_MOSTLY_DATA(cacheline)                             \
 898                 DATA_DATA                                               \
 899                 CONSTRUCTORS                                            \
 900         }                                                               \
 901         BUG_TABLE                                                       \
 902
 903 #define INIT_TEXT_SECTION(inittext_align)                               \
 904         . = ALIGN(inittext_align);                                      \
 905         .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {               \
 906                 VMLINUX_SYMBOL(_sinittext) = .;                         \
 907                 INIT_TEXT                                               \
 908                 VMLINUX_SYMBOL(_einittext) = .;                         \
 909         }
 910
 911 #define INIT_DATA_SECTION(initsetup_align)                              \
 912         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {               \
 913                 INIT_DATA                                               \
 914                 INIT_SETUP(initsetup_align)                             \
 915                 INIT_CALLS                                              \
 916                 CON_INITCALL                                            \
 917                 SECURITY_INITCALL                                       \
 918                 INIT_RAM_FS                                             \
 919         }
 920
 921 #define BSS_SECTION(sbss_align, bss_align, stop_align)                  \
 922         . = ALIGN(sbss_align);                                          \
 923         VMLINUX_SYMBOL(__bss_start) = .;                                \
 924         SBSS(sbss_align)                                                \
 925         BSS(bss_align)                                                  \
 926         . = ALIGN(stop_align);                                          \
 927         VMLINUX_SYMBOL(__bss_stop) = .;