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