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