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         VMLINUX_SYMBOL(__start_once) = .;                               \
 227         *(.data.once)                                                   \
 228         VMLINUX_SYMBOL(__end_once) = .;                                 \
 229         STRUCT_ALIGN();                                                 \
 230         *(__tracepoints)                                                \
 231         /* implement dynamic printk debug */                            \
 232         . = ALIGN(8);                                                   \
 233         VMLINUX_SYMBOL(__start___jump_table) = .;                       \
 234         KEEP(*(__jump_table))                                           \
 235         VMLINUX_SYMBOL(__stop___jump_table) = .;                        \
 236         . = ALIGN(8);                                                   \
 237         VMLINUX_SYMBOL(__start___verbose) = .;                          \
 238         KEEP(*(__verbose))                                              \
 239         VMLINUX_SYMBOL(__stop___verbose) = .;                           \
 240         LIKELY_PROFILE()                                                \
 241         BRANCH_PROFILE()                                                \
 242         TRACE_PRINTKS()                                                 \
 243         TRACEPOINT_STR()
 244
 245 /*
 246  * Data section helpers
 247  */
 248 #define NOSAVE_DATA                                                     \
 249         . = ALIGN(PAGE_SIZE);                                           \
 250         VMLINUX_SYMBOL(__nosave_begin) = .;                             \
 251         *(.data..nosave)                                                \
 252         . = ALIGN(PAGE_SIZE);                                           \
 253         VMLINUX_SYMBOL(__nosave_end) = .;
 254
 255 #define PAGE_ALIGNED_DATA(page_align)                                   \
 256         . = ALIGN(page_align);                                          \
 257         *(.data..page_aligned)
 258
 259 #define READ_MOSTLY_DATA(align)                                         \
 260         . = ALIGN(align);                                               \
 261         *(.data..read_mostly)                                           \
 262         . = ALIGN(align);
 263
 264 #define CACHELINE_ALIGNED_DATA(align)                                   \
 265         . = ALIGN(align);                                               \
 266         *(.data..cacheline_aligned)
 267
 268 #define INIT_TASK_DATA(align)                                           \
 269         . = ALIGN(align);                                               \
 270         VMLINUX_SYMBOL(__start_init_task) = .;                          \
 271         *(.data..init_task)                                             \
 272         VMLINUX_SYMBOL(__end_init_task) = .;
 273
 274 /*
 275  * Allow architectures to handle ro_after_init data on their
 276  * own by defining an empty RO_AFTER_INIT_DATA.
 277  */
 278 #ifndef RO_AFTER_INIT_DATA
 279 #define RO_AFTER_INIT_DATA                                              \
 280         VMLINUX_SYMBOL(__start_ro_after_init) = .;                      \
 281         *(.data..ro_after_init)                                         \
 282         VMLINUX_SYMBOL(__end_ro_after_init) = .;
 283 #endif
 284
 285 /*
 286  * Read only Data
 287  */
 288 #define RO_DATA_SECTION(align)                                          \
 289         . = ALIGN((align));                                             \
 290         .rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {           \
 291                 VMLINUX_SYMBOL(__start_rodata) = .;                     \
 292                 *(.rodata) *(.rodata.*)                                 \
 293                 RO_AFTER_INIT_DATA      /* Read only after init */      \
 294                 KEEP(*(__vermagic))     /* Kernel version magic */      \
 295                 . = ALIGN(8);                                           \
 296                 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .;         \
 297                 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \
 298                 VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .;          \
 299                 *(__tracepoints_strings)/* Tracepoints: strings */      \
 300         }                                                               \
 301                                                                         \
 302         .rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {          \
 303                 *(.rodata1)                                             \
 304         }                                                               \
 305                                                                         \
 306         /* PCI quirks */                                                \
 307         .pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {        \
 308                 VMLINUX_SYMBOL(__start_pci_fixups_early) = .;           \
 309                 KEEP(*(.pci_fixup_early))                               \
 310                 VMLINUX_SYMBOL(__end_pci_fixups_early) = .;             \
 311                 VMLINUX_SYMBOL(__start_pci_fixups_header) = .;          \
 312                 KEEP(*(.pci_fixup_header))                              \
 313                 VMLINUX_SYMBOL(__end_pci_fixups_header) = .;            \
 314                 VMLINUX_SYMBOL(__start_pci_fixups_final) = .;           \
 315                 KEEP(*(.pci_fixup_final))                               \
 316                 VMLINUX_SYMBOL(__end_pci_fixups_final) = .;             \
 317                 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .;          \
 318                 KEEP(*(.pci_fixup_enable))                              \
 319                 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .;            \
 320                 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .;          \
 321                 KEEP(*(.pci_fixup_resume))                              \
 322                 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .;            \
 323                 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .;    \
 324                 KEEP(*(.pci_fixup_resume_early))                        \
 325                 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .;      \
 326                 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .;         \
 327                 KEEP(*(.pci_fixup_suspend))                             \
 328                 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .;           \
 329                 VMLINUX_SYMBOL(__start_pci_fixups_suspend_late) = .;    \
 330                 KEEP(*(.pci_fixup_suspend_late))                        \
 331                 VMLINUX_SYMBOL(__end_pci_fixups_suspend_late) = .;      \
 332         }                                                               \
 333                                                                         \
 334         /* Built-in firmware blobs */                                   \
 335         .builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {      \
 336                 VMLINUX_SYMBOL(__start_builtin_fw) = .;                 \
 337                 KEEP(*(.builtin_fw))                                    \
 338                 VMLINUX_SYMBOL(__end_builtin_fw) = .;                   \
 339         }                                                               \
 340                                                                         \
 341         TRACEDATA                                                       \
 342                                                                         \
 343         /* Kernel symbol table: Normal symbols */                       \
 344         __ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {         \
 345                 VMLINUX_SYMBOL(__start___ksymtab) = .;                  \
 346                 KEEP(*(SORT(___ksymtab+*)))                             \
 347                 VMLINUX_SYMBOL(__stop___ksymtab) = .;                   \
 348         }                                                               \
 349                                                                         \
 350         /* Kernel symbol table: GPL-only symbols */                     \
 351         __ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {     \
 352                 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .;              \
 353                 KEEP(*(SORT(___ksymtab_gpl+*)))                         \
 354                 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .;               \
 355         }                                                               \
 356                                                                         \
 357         /* Kernel symbol table: Normal unused symbols */                \
 358         __ksymtab_unused  : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) {  \
 359                 VMLINUX_SYMBOL(__start___ksymtab_unused) = .;           \
 360                 KEEP(*(SORT(___ksymtab_unused+*)))                      \
 361                 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .;            \
 362         }                                                               \
 363                                                                         \
 364         /* Kernel symbol table: GPL-only unused symbols */              \
 365         __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
 366                 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .;       \
 367                 KEEP(*(SORT(___ksymtab_unused_gpl+*)))                  \
 368                 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .;        \
 369         }                                                               \
 370                                                                         \
 371         /* Kernel symbol table: GPL-future-only symbols */              \
 372         __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
 373                 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .;       \
 374                 KEEP(*(SORT(___ksymtab_gpl_future+*)))                  \
 375                 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .;        \
 376         }                                                               \
 377                                                                         \
 378         /* Kernel symbol table: Normal symbols */                       \
 379         __kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {         \
 380                 VMLINUX_SYMBOL(__start___kcrctab) = .;                  \
 381                 KEEP(*(SORT(___kcrctab+*)))                             \
 382                 VMLINUX_SYMBOL(__stop___kcrctab) = .;                   \
 383         }                                                               \
 384                                                                         \
 385         /* Kernel symbol table: GPL-only symbols */                     \
 386         __kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {     \
 387                 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .;              \
 388                 KEEP(*(SORT(___kcrctab_gpl+*)))                         \
 389                 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .;               \
 390         }                                                               \
 391                                                                         \
 392         /* Kernel symbol table: Normal unused symbols */                \
 393         __kcrctab_unused  : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) {  \
 394                 VMLINUX_SYMBOL(__start___kcrctab_unused) = .;           \
 395                 KEEP(*(SORT(___kcrctab_unused+*)))                      \
 396                 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .;            \
 397         }                                                               \
 398                                                                         \
 399         /* Kernel symbol table: GPL-only unused symbols */              \
 400         __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
 401                 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .;       \
 402                 KEEP(*(SORT(___kcrctab_unused_gpl+*)))                  \
 403                 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .;        \
 404         }                                                               \
 405                                                                         \
 406         /* Kernel symbol table: GPL-future-only symbols */              \
 407         __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
 408                 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .;       \
 409                 KEEP(*(SORT(___kcrctab_gpl_future+*)))                  \
 410                 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .;        \
 411         }                                                               \
 412                                                                         \
 413         /* Kernel symbol table: strings */                              \
 414         __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
 415                 *(__ksymtab_strings)                                    \
 416         }                                                               \
 417                                                                         \
 418         /* __*init sections */                                          \
 419         __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {         \
 420                 *(.ref.rodata)                                          \
 421                 MEM_KEEP(init.rodata)                                   \
 422                 MEM_KEEP(exit.rodata)                                   \
 423         }                                                               \
 424                                                                         \
 425         /* Built-in module parameters. */                               \
 426         __param : AT(ADDR(__param) - LOAD_OFFSET) {                     \
 427                 VMLINUX_SYMBOL(__start___param) = .;                    \
 428                 KEEP(*(__param))                                        \
 429                 VMLINUX_SYMBOL(__stop___param) = .;                     \
 430         }                                                               \
 431                                                                         \
 432         /* Built-in module versions. */                                 \
 433         __modver : AT(ADDR(__modver) - LOAD_OFFSET) {                   \
 434                 VMLINUX_SYMBOL(__start___modver) = .;                   \
 435                 KEEP(*(__modver))                                       \
 436                 VMLINUX_SYMBOL(__stop___modver) = .;                    \
 437                 . = ALIGN((align));                                     \
 438                 VMLINUX_SYMBOL(__end_rodata) = .;                       \
 439         }                                                               \
 440         . = ALIGN((align));
 441
 442 /* RODATA & RO_DATA provided for backward compatibility.
 443  * All archs are supposed to use RO_DATA() */
 444 #define RODATA          RO_DATA_SECTION(4096)
 445 #define RO_DATA(align)  RO_DATA_SECTION(align)
 446
 447 #define SECURITY_INIT                                                   \
 448         .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
 449                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 450                 KEEP(*(.security_initcall.init))                        \
 451                 VMLINUX_SYMBOL(__security_initcall_end) = .;            \
 452         }
 453
 454 /*
 455  * .text section. Map to function alignment to avoid address changes
 456  * during second ld run in second ld pass when generating System.map
 457  *
 458  * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead
 459  * code elimination is enabled, so these sections should be converted
 460  * to use ".." first.
 461  */
 462 #define TEXT_TEXT                                                       \
 463                 ALIGN_FUNCTION();                                       \
 464                 *(.text.hot TEXT_MAIN .text.fixup .text.unlikely)       \
 465                 *(.text..refcount)                                      \
 466                 *(.ref.text)                                            \
 467         MEM_KEEP(init.text)                                             \
 468         MEM_KEEP(exit.text)                                             \
 469
 470
 471 /* sched.text is aling to function alignment to secure we have same
 472  * address even at second ld pass when generating System.map */
 473 #define SCHED_TEXT                                                      \
 474                 ALIGN_FUNCTION();                                       \
 475                 VMLINUX_SYMBOL(__sched_text_start) = .;                 \
 476                 *(.sched.text)                                          \
 477                 VMLINUX_SYMBOL(__sched_text_end) = .;
 478
 479 /* spinlock.text is aling to function alignment to secure we have same
 480  * address even at second ld pass when generating System.map */
 481 #define LOCK_TEXT                                                       \
 482                 ALIGN_FUNCTION();                                       \
 483                 VMLINUX_SYMBOL(__lock_text_start) = .;                  \
 484                 *(.spinlock.text)                                       \
 485                 VMLINUX_SYMBOL(__lock_text_end) = .;
 486
 487 #define CPUIDLE_TEXT                                                    \
 488                 ALIGN_FUNCTION();                                       \
 489                 VMLINUX_SYMBOL(__cpuidle_text_start) = .;               \
 490                 *(.cpuidle.text)                                        \
 491                 VMLINUX_SYMBOL(__cpuidle_text_end) = .;
 492
 493 #define KPROBES_TEXT                                                    \
 494                 ALIGN_FUNCTION();                                       \
 495                 VMLINUX_SYMBOL(__kprobes_text_start) = .;               \
 496                 *(.kprobes.text)                                        \
 497                 VMLINUX_SYMBOL(__kprobes_text_end) = .;
 498
 499 #define ENTRY_TEXT                                                      \
 500                 ALIGN_FUNCTION();                                       \
 501                 VMLINUX_SYMBOL(__entry_text_start) = .;                 \
 502                 *(.entry.text)                                          \
 503                 VMLINUX_SYMBOL(__entry_text_end) = .;
 504
 505 #define IRQENTRY_TEXT                                                   \
 506                 ALIGN_FUNCTION();                                       \
 507                 VMLINUX_SYMBOL(__irqentry_text_start) = .;              \
 508                 *(.irqentry.text)                                       \
 509                 VMLINUX_SYMBOL(__irqentry_text_end) = .;
 510
 511 #define SOFTIRQENTRY_TEXT                                               \
 512                 ALIGN_FUNCTION();                                       \
 513                 VMLINUX_SYMBOL(__softirqentry_text_start) = .;          \
 514                 *(.softirqentry.text)                                   \
 515                 VMLINUX_SYMBOL(__softirqentry_text_end) = .;
 516
 517 /* Section used for early init (in .S files) */
 518 #define HEAD_TEXT  *(.head.text)
 519
 520 #define HEAD_TEXT_SECTION                                                       \
 521         .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {               \
 522                 HEAD_TEXT                                               \
 523         }
 524
 525 /*
 526  * Exception table
 527  */
 528 #define EXCEPTION_TABLE(align)                                          \
 529         . = ALIGN(align);                                               \
 530         __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {               \
 531                 VMLINUX_SYMBOL(__start___ex_table) = .;                 \
 532                 KEEP(*(__ex_table))                                     \
 533                 VMLINUX_SYMBOL(__stop___ex_table) = .;                  \
 534         }
 535
 536 /*
 537  * Init task
 538  */
 539 #define INIT_TASK_DATA_SECTION(align)                                   \
 540         . = ALIGN(align);                                               \
 541         .data..init_task :  AT(ADDR(.data..init_task) - LOAD_OFFSET) {  \
 542                 INIT_TASK_DATA(align)                                   \
 543         }
 544
 545 #ifdef CONFIG_CONSTRUCTORS
 546 #define KERNEL_CTORS()  . = ALIGN(8);                      \
 547                         VMLINUX_SYMBOL(__ctors_start) = .; \
 548                         KEEP(*(.ctors))                    \
 549                         KEEP(*(SORT(.init_array.*)))       \
 550                         KEEP(*(.init_array))               \
 551                         VMLINUX_SYMBOL(__ctors_end) = .;
 552 #else
 553 #define KERNEL_CTORS()
 554 #endif
 555
 556 /* init and exit section handling */
 557 #define INIT_DATA                                                       \
 558         KEEP(*(SORT(___kentry+*)))                                      \
 559         *(.init.data)                                                   \
 560         MEM_DISCARD(init.data)                                          \
 561         KERNEL_CTORS()                                                  \
 562         MCOUNT_REC()                                                    \
 563         *(.init.rodata)                                                 \
 564         FTRACE_EVENTS()                                                 \
 565         TRACE_SYSCALLS()                                                \
 566         KPROBE_BLACKLIST()                                              \
 567         MEM_DISCARD(init.rodata)                                        \
 568         CLK_OF_TABLES()                                                 \
 569         RESERVEDMEM_OF_TABLES()                                         \
 570         TIMER_OF_TABLES()                                               \
 571         IOMMU_OF_TABLES()                                               \
 572         CPU_METHOD_OF_TABLES()                                          \
 573         CPUIDLE_METHOD_OF_TABLES()                                      \
 574         KERNEL_DTB()                                                    \
 575         IRQCHIP_OF_MATCH_TABLE()                                        \
 576         ACPI_PROBE_TABLE(irqchip)                                       \
 577         ACPI_PROBE_TABLE(timer)                                         \
 578         ACPI_PROBE_TABLE(iort)                                          \
 579         EARLYCON_TABLE()
 580
 581 #define INIT_TEXT                                                       \
 582         *(.init.text)                                                   \
 583         *(.text.startup)                                                \
 584         MEM_DISCARD(init.text)
 585
 586 #define EXIT_DATA                                                       \
 587         *(.exit.data)                                                   \
 588         *(.fini_array)                                                  \
 589         *(.dtors)                                                       \
 590         MEM_DISCARD(exit.data)                                          \
 591         MEM_DISCARD(exit.rodata)
 592
 593 #define EXIT_TEXT                                                       \
 594         *(.exit.text)                                                   \
 595         *(.text.exit)                                                   \
 596         MEM_DISCARD(exit.text)
 597
 598 #define EXIT_CALL                                                       \
 599         *(.exitcall.exit)
 600
 601 /*
 602  * bss (Block Started by Symbol) - uninitialized data
 603  * zeroed during startup
 604  */
 605 #define SBSS(sbss_align)                                                \
 606         . = ALIGN(sbss_align);                                          \
 607         .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {                         \
 608                 *(.dynsbss)                                             \
 609                 *(.sbss)                                                \
 610                 *(.scommon)                                             \
 611         }
 612
 613 /*
 614  * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
 615  * sections to the front of bss.
 616  */
 617 #ifndef BSS_FIRST_SECTIONS
 618 #define BSS_FIRST_SECTIONS
 619 #endif
 620
 621 #define BSS(bss_align)                                                  \
 622         . = ALIGN(bss_align);                                           \
 623         .bss : AT(ADDR(.bss) - LOAD_OFFSET) {                           \
 624                 BSS_FIRST_SECTIONS                                      \
 625                 *(.bss..page_aligned)                                   \
 626                 *(.dynbss)                                              \
 627                 *(BSS_MAIN)                                             \
 628                 *(COMMON)                                               \
 629         }
 630
 631 /*
 632  * DWARF debug sections.
 633  * Symbols in the DWARF debugging sections are relative to
 634  * the beginning of the section so we begin them at 0.
 635  */
 636 #define DWARF_DEBUG                                                     \
 637                 /* DWARF 1 */                                           \
 638                 .debug          0 : { *(.debug) }                       \
 639                 .line           0 : { *(.line) }                        \
 640                 /* GNU DWARF 1 extensions */                            \
 641                 .debug_srcinfo  0 : { *(.debug_srcinfo) }               \
 642                 .debug_sfnames  0 : { *(.debug_sfnames) }               \
 643                 /* DWARF 1.1 and DWARF 2 */                             \
 644                 .debug_aranges  0 : { *(.debug_aranges) }               \
 645                 .debug_pubnames 0 : { *(.debug_pubnames) }              \
 646                 /* DWARF 2 */                                           \
 647                 .debug_info     0 : { *(.debug_info                     \
 648                                 .gnu.linkonce.wi.*) }                   \
 649                 .debug_abbrev   0 : { *(.debug_abbrev) }                \
 650                 .debug_line     0 : { *(.debug_line) }                  \
 651                 .debug_frame    0 : { *(.debug_frame) }                 \
 652                 .debug_str      0 : { *(.debug_str) }                   \
 653                 .debug_loc      0 : { *(.debug_loc) }                   \
 654                 .debug_macinfo  0 : { *(.debug_macinfo) }               \
 655                 .debug_pubtypes 0 : { *(.debug_pubtypes) }              \
 656                 /* DWARF 3 */                                           \
 657                 .debug_ranges   0 : { *(.debug_ranges) }                \
 658                 /* SGI/MIPS DWARF 2 extensions */                       \
 659                 .debug_weaknames 0 : { *(.debug_weaknames) }            \
 660                 .debug_funcnames 0 : { *(.debug_funcnames) }            \
 661                 .debug_typenames 0 : { *(.debug_typenames) }            \
 662                 .debug_varnames  0 : { *(.debug_varnames) }             \
 663                 /* GNU DWARF 2 extensions */                            \
 664                 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) }      \
 665                 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) }      \
 666                 /* DWARF 4 */                                           \
 667                 .debug_types    0 : { *(.debug_types) }                 \
 668                 /* DWARF 5 */                                           \
 669                 .debug_macro    0 : { *(.debug_macro) }                 \
 670                 .debug_addr     0 : { *(.debug_addr) }
 671
 672                 /* Stabs debugging sections.  */
 673 #define STABS_DEBUG                                                     \
 674                 .stab 0 : { *(.stab) }                                  \
 675                 .stabstr 0 : { *(.stabstr) }                            \
 676                 .stab.excl 0 : { *(.stab.excl) }                        \
 677                 .stab.exclstr 0 : { *(.stab.exclstr) }                  \
 678                 .stab.index 0 : { *(.stab.index) }                      \
 679                 .stab.indexstr 0 : { *(.stab.indexstr) }                \
 680                 .comment 0 : { *(.comment) }
 681
 682 #ifdef CONFIG_GENERIC_BUG
 683 #define BUG_TABLE                                                       \
 684         . = ALIGN(8);                                                   \
 685         __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {             \
 686                 VMLINUX_SYMBOL(__start___bug_table) = .;                \
 687                 KEEP(*(__bug_table))                                    \
 688                 VMLINUX_SYMBOL(__stop___bug_table) = .;                 \
 689         }
 690 #else
 691 #define BUG_TABLE
 692 #endif
 693
 694 #ifdef CONFIG_UNWINDER_ORC
 695 #define ORC_UNWIND_TABLE                                                \
 696         . = ALIGN(4);                                                   \
 697         .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) {       \
 698                 VMLINUX_SYMBOL(__start_orc_unwind_ip) = .;              \
 699                 KEEP(*(.orc_unwind_ip))                                 \
 700                 VMLINUX_SYMBOL(__stop_orc_unwind_ip) = .;               \
 701         }                                                               \
 702         . = ALIGN(6);                                                   \
 703         .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) {             \
 704                 VMLINUX_SYMBOL(__start_orc_unwind) = .;                 \
 705                 KEEP(*(.orc_unwind))                                    \
 706                 VMLINUX_SYMBOL(__stop_orc_unwind) = .;                  \
 707         }                                                               \
 708         . = ALIGN(4);                                                   \
 709         .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) {             \
 710                 VMLINUX_SYMBOL(orc_lookup) = .;                         \
 711                 . += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) /        \
 712                         LOOKUP_BLOCK_SIZE) + 1) * 4;                    \
 713                 VMLINUX_SYMBOL(orc_lookup_end) = .;                     \
 714         }
 715 #else
 716 #define ORC_UNWIND_TABLE
 717 #endif
 718
 719 #ifdef CONFIG_PM_TRACE
 720 #define TRACEDATA                                                       \
 721         . = ALIGN(4);                                                   \
 722         .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {               \
 723                 VMLINUX_SYMBOL(__tracedata_start) = .;                  \
 724                 KEEP(*(.tracedata))                                     \
 725                 VMLINUX_SYMBOL(__tracedata_end) = .;                    \
 726         }
 727 #else
 728 #define TRACEDATA
 729 #endif
 730
 731 #define NOTES                                                           \
 732         .notes : AT(ADDR(.notes) - LOAD_OFFSET) {                       \
 733                 VMLINUX_SYMBOL(__start_notes) = .;                      \
 734                 *(.note.*)                                              \
 735                 VMLINUX_SYMBOL(__stop_notes) = .;                       \
 736         }
 737
 738 #define INIT_SETUP(initsetup_align)                                     \
 739                 . = ALIGN(initsetup_align);                             \
 740                 VMLINUX_SYMBOL(__setup_start) = .;                      \
 741                 KEEP(*(.init.setup))                                    \
 742                 VMLINUX_SYMBOL(__setup_end) = .;
 743
 744 #define INIT_CALLS_LEVEL(level)                                         \
 745                 VMLINUX_SYMBOL(__initcall##level##_start) = .;          \
 746                 KEEP(*(.initcall##level##.init))                        \
 747                 KEEP(*(.initcall##level##s.init))                       \
 748
 749 #define INIT_CALLS                                                      \
 750                 VMLINUX_SYMBOL(__initcall_start) = .;                   \
 751                 KEEP(*(.initcallearly.init))                            \
 752                 INIT_CALLS_LEVEL(0)                                     \
 753                 INIT_CALLS_LEVEL(1)                                     \
 754                 INIT_CALLS_LEVEL(2)                                     \
 755                 INIT_CALLS_LEVEL(3)                                     \
 756                 INIT_CALLS_LEVEL(4)                                     \
 757                 INIT_CALLS_LEVEL(5)                                     \
 758                 INIT_CALLS_LEVEL(rootfs)                                \
 759                 INIT_CALLS_LEVEL(6)                                     \
 760                 INIT_CALLS_LEVEL(7)                                     \
 761                 VMLINUX_SYMBOL(__initcall_end) = .;
 762
 763 #define CON_INITCALL                                                    \
 764                 VMLINUX_SYMBOL(__con_initcall_start) = .;               \
 765                 KEEP(*(.con_initcall.init))                             \
 766                 VMLINUX_SYMBOL(__con_initcall_end) = .;
 767
 768 #define SECURITY_INITCALL                                               \
 769                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 770                 KEEP(*(.security_initcall.init))                        \
 771                 VMLINUX_SYMBOL(__security_initcall_end) = .;
 772
 773 #ifdef CONFIG_BLK_DEV_INITRD
 774 #define INIT_RAM_FS                                                     \
 775         . = ALIGN(4);                                                   \
 776         VMLINUX_SYMBOL(__initramfs_start) = .;                          \
 777         KEEP(*(.init.ramfs))                                            \
 778         . = ALIGN(8);                                                   \
 779         KEEP(*(.init.ramfs.info))
 780 #else
 781 #define INIT_RAM_FS
 782 #endif
 783
 784 /*
 785  * Memory encryption operates on a page basis. Since we need to clear
 786  * the memory encryption mask for this section, it needs to be aligned
 787  * on a page boundary and be a page-size multiple in length.
 788  *
 789  * Note: We use a separate section so that only this section gets
 790  * decrypted to avoid exposing more than we wish.
 791  */
 792 #ifdef CONFIG_AMD_MEM_ENCRYPT
 793 #define PERCPU_DECRYPTED_SECTION                                        \
 794         . = ALIGN(PAGE_SIZE);                                           \
 795         *(.data..percpu..decrypted)                                     \
 796         . = ALIGN(PAGE_SIZE);
 797 #else
 798 #define PERCPU_DECRYPTED_SECTION
 799 #endif
 800
 801
 802 /*
 803  * Default discarded sections.
 804  *
 805  * Some archs want to discard exit text/data at runtime rather than
 806  * link time due to cross-section references such as alt instructions,
 807  * bug table, eh_frame, etc.  DISCARDS must be the last of output
 808  * section definitions so that such archs put those in earlier section
 809  * definitions.
 810  */
 811 #define DISCARDS                                                        \
 812         /DISCARD/ : {                                                   \
 813         EXIT_TEXT                                                       \
 814         EXIT_DATA                                                       \
 815         EXIT_CALL                                                       \
 816         *(.discard)                                                     \
 817         *(.discard.*)                                                   \
 818         }
 819
 820 /**
 821  * PERCPU_INPUT - the percpu input sections
 822  * @cacheline: cacheline size
 823  *
 824  * The core percpu section names and core symbols which do not rely
 825  * directly upon load addresses.
 826  *
 827  * @cacheline is used to align subsections to avoid false cacheline
 828  * sharing between subsections for different purposes.
 829  */
 830 #define PERCPU_INPUT(cacheline)                                         \
 831         VMLINUX_SYMBOL(__per_cpu_start) = .;                            \
 832         *(.data..percpu..first)                                         \
 833         . = ALIGN(PAGE_SIZE);                                           \
 834         *(.data..percpu..page_aligned)                                  \
 835         . = ALIGN(cacheline);                                           \
 836         *(.data..percpu..read_mostly)                                   \
 837         . = ALIGN(cacheline);                                           \
 838         *(.data..percpu)                                                \
 839         *(.data..percpu..shared_aligned)                                \
 840         PERCPU_DECRYPTED_SECTION                                        \
 841         VMLINUX_SYMBOL(__per_cpu_end) = .;
 842
 843 /**
 844  * PERCPU_VADDR - define output section for percpu area
 845  * @cacheline: cacheline size
 846  * @vaddr: explicit base address (optional)
 847  * @phdr: destination PHDR (optional)
 848  *
 849  * Macro which expands to output section for percpu area.
 850  *
 851  * @cacheline is used to align subsections to avoid false cacheline
 852  * sharing between subsections for different purposes.
 853  *
 854  * If @vaddr is not blank, it specifies explicit base address and all
 855  * percpu symbols will be offset from the given address.  If blank,
 856  * @vaddr always equals @laddr + LOAD_OFFSET.
 857  *
 858  * @phdr defines the output PHDR to use if not blank.  Be warned that
 859  * output PHDR is sticky.  If @phdr is specified, the next output
 860  * section in the linker script will go there too.  @phdr should have
 861  * a leading colon.
 862  *
 863  * Note that this macros defines __per_cpu_load as an absolute symbol.
 864  * If there is no need to put the percpu section at a predetermined
 865  * address, use PERCPU_SECTION.
 866  */
 867 #define PERCPU_VADDR(cacheline, vaddr, phdr)                            \
 868         VMLINUX_SYMBOL(__per_cpu_load) = .;                             \
 869         .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load)         \
 870                                 - LOAD_OFFSET) {                        \
 871                 PERCPU_INPUT(cacheline)                                 \
 872         } phdr                                                          \
 873         . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
 874
 875 /**
 876  * PERCPU_SECTION - define output section for percpu area, simple version
 877  * @cacheline: cacheline size
 878  *
 879  * Align to PAGE_SIZE and outputs output section for percpu area.  This
 880  * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
 881  * __per_cpu_start will be identical.
 882  *
 883  * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
 884  * except that __per_cpu_load is defined as a relative symbol against
 885  * .data..percpu which is required for relocatable x86_32 configuration.
 886  */
 887 #define PERCPU_SECTION(cacheline)                                       \
 888         . = ALIGN(PAGE_SIZE);                                           \
 889         .data..percpu   : AT(ADDR(.data..percpu) - LOAD_OFFSET) {       \
 890                 VMLINUX_SYMBOL(__per_cpu_load) = .;                     \
 891                 PERCPU_INPUT(cacheline)                                 \
 892         }
 893
 894
 895 /*
 896  * Definition of the high level *_SECTION macros
 897  * They will fit only a subset of the architectures
 898  */
 899
 900
 901 /*
 902  * Writeable data.
 903  * All sections are combined in a single .data section.
 904  * The sections following CONSTRUCTORS are arranged so their
 905  * typical alignment matches.
 906  * A cacheline is typical/always less than a PAGE_SIZE so
 907  * the sections that has this restriction (or similar)
 908  * is located before the ones requiring PAGE_SIZE alignment.
 909  * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
 910  * matches the requirement of PAGE_ALIGNED_DATA.
 911  *
 912  * use 0 as page_align if page_aligned data is not used */
 913 #define RW_DATA_SECTION(cacheline, pagealigned, inittask)               \
 914         . = ALIGN(PAGE_SIZE);                                           \
 915         .data : AT(ADDR(.data) - LOAD_OFFSET) {                         \
 916                 INIT_TASK_DATA(inittask)                                \
 917                 NOSAVE_DATA                                             \
 918                 PAGE_ALIGNED_DATA(pagealigned)                          \
 919                 CACHELINE_ALIGNED_DATA(cacheline)                       \
 920                 READ_MOSTLY_DATA(cacheline)                             \
 921                 DATA_DATA                                               \
 922                 CONSTRUCTORS                                            \
 923         }                                                               \
 924         BUG_TABLE                                                       \
 925
 926 #define INIT_TEXT_SECTION(inittext_align)                               \
 927         . = ALIGN(inittext_align);                                      \
 928         .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {               \
 929                 VMLINUX_SYMBOL(_sinittext) = .;                         \
 930                 INIT_TEXT                                               \
 931                 VMLINUX_SYMBOL(_einittext) = .;                         \
 932         }
 933
 934 #define INIT_DATA_SECTION(initsetup_align)                              \
 935         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {               \
 936                 INIT_DATA                                               \
 937                 INIT_SETUP(initsetup_align)                             \
 938                 INIT_CALLS                                              \
 939                 CON_INITCALL                                            \
 940                 SECURITY_INITCALL                                       \
 941                 INIT_RAM_FS                                             \
 942         }
 943
 944 #define BSS_SECTION(sbss_align, bss_align, stop_align)                  \
 945         . = ALIGN(sbss_align);                                          \
 946         VMLINUX_SYMBOL(__bss_start) = .;                                \
 947         SBSS(sbss_align)                                                \
 948         BSS(bss_align)                                                  \
 949         . = ALIGN(stop_align);                                          \
 950         VMLINUX_SYMBOL(__bss_stop) = .;