include/asm-generic/vmlinux.lds.h

   1 /*
   2  * Helper macros to support writing architecture specific
   3  * linker scripts.
   4  *
   5  * A minimal linker scripts has following content:
   6  * [This is a sample, architectures may have special requiriements]
   7  *
   8  * OUTPUT_FORMAT(...)
   9  * OUTPUT_ARCH(...)
  10  * ENTRY(...)
  11  * SECTIONS
  12  * {
  13  *      . = START;
  14  *      __init_begin = .;
  15  *      HEAD_TEXT_SECTION
  16  *      INIT_TEXT_SECTION(PAGE_SIZE)
  17  *      INIT_DATA_SECTION(...)
  18  *      PERCPU_SECTION(CACHELINE_SIZE)
  19  *      __init_end = .;
  20  *
  21  *      _stext = .;
  22  *      TEXT_SECTION = 0
  23  *      _etext = .;
  24  *
  25  *      _sdata = .;
  26  *      RO_DATA_SECTION(PAGE_SIZE)
  27  *      RW_DATA_SECTION(...)
  28  *      _edata = .;
  29  *
  30  *      EXCEPTION_TABLE(...)
  31  *      NOTES
  32  *
  33  *      BSS_SECTION(0, 0, 0)
  34  *      _end = .;
  35  *
  36  *      STABS_DEBUG
  37  *      DWARF_DEBUG
  38  *
  39  *      DISCARDS                // must be the last
  40  * }
  41  *
  42  * [__init_begin, __init_end] is the init section that may be freed after init
  43  *      // __init_begin and __init_end should be page aligned, so that we can
  44  *      // free the whole .init memory
  45  * [_stext, _etext] is the text section
  46  * [_sdata, _edata] is the data section
  47  *
  48  * Some of the included output section have their own set of constants.
  49  * Examples are: [__initramfs_start, __initramfs_end] for initramfs and
  50  *               [__nosave_begin, __nosave_end] for the nosave data
  51  */
  52
  53 #ifndef LOAD_OFFSET
  54 #define LOAD_OFFSET 0
  55 #endif
  56
  57 #include <linux/export.h>
  58
  59 /* Align . to a 8 byte boundary equals to maximum function alignment. */
  60 #define ALIGN_FUNCTION()  . = ALIGN(8)
  61
  62 /*
  63  * LD_DEAD_CODE_DATA_ELIMINATION option enables -fdata-sections, which
  64  * generates .data.identifier sections, which need to be pulled in with
  65  * .data. We don't want to pull in .data..other sections, which Linux
  66  * has defined. Same for text and bss.
  67  */
  68 #ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
  69 #define TEXT_MAIN .text .text.[0-9a-zA-Z_]*
  70 #define DATA_MAIN .data .data.[0-9a-zA-Z_]*
  71 #define BSS_MAIN .bss .bss.[0-9a-zA-Z_]*
  72 #else
  73 #define TEXT_MAIN .text
  74 #define DATA_MAIN .data
  75 #define BSS_MAIN .bss
  76 #endif
  77
  78 /*
  79  * Align to a 32 byte boundary equal to the
  80  * alignment gcc 4.5 uses for a struct
  81  */
  82 #define STRUCT_ALIGNMENT 32
  83 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
  84
  85 /* The actual configuration determine if the init/exit sections
  86  * are handled as text/data or they can be discarded (which
  87  * often happens at runtime)
  88  */
  89 #ifdef CONFIG_HOTPLUG_CPU
  90 #define CPU_KEEP(sec)    *(.cpu##sec)
  91 #define CPU_DISCARD(sec)
  92 #else
  93 #define CPU_KEEP(sec)
  94 #define CPU_DISCARD(sec) *(.cpu##sec)
  95 #endif
  96
  97 #if defined(CONFIG_MEMORY_HOTPLUG)
  98 #define MEM_KEEP(sec)    *(.mem##sec)
  99 #define MEM_DISCARD(sec)
 100 #else
 101 #define MEM_KEEP(sec)
 102 #define MEM_DISCARD(sec) *(.mem##sec)
 103 #endif
 104
 105 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
 106 #define MCOUNT_REC()    . = ALIGN(8);                           \
 107                         VMLINUX_SYMBOL(__start_mcount_loc) = .; \
 108                         *(__mcount_loc)                         \
 109                         VMLINUX_SYMBOL(__stop_mcount_loc) = .;
 110 #else
 111 #define MCOUNT_REC()
 112 #endif
 113
 114 #ifdef CONFIG_TRACE_BRANCH_PROFILING
 115 #define LIKELY_PROFILE()        VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \
 116                                 *(_ftrace_annotated_branch)                           \
 117                                 VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .;
 118 #else
 119 #define LIKELY_PROFILE()
 120 #endif
 121
 122 #ifdef CONFIG_PROFILE_ALL_BRANCHES
 123 #define BRANCH_PROFILE()        VMLINUX_SYMBOL(__start_branch_profile) = .;   \
 124                                 *(_ftrace_branch)                             \
 125                                 VMLINUX_SYMBOL(__stop_branch_profile) = .;
 126 #else
 127 #define BRANCH_PROFILE()
 128 #endif
 129
 130 #ifdef CONFIG_KPROBES
 131 #define KPROBE_BLACKLIST()      . = ALIGN(8);                                 \
 132                                 VMLINUX_SYMBOL(__start_kprobe_blacklist) = .; \
 133                                 KEEP(*(_kprobe_blacklist))                    \
 134                                 VMLINUX_SYMBOL(__stop_kprobe_blacklist) = .;
 135 #else
 136 #define KPROBE_BLACKLIST()
 137 #endif
 138
 139 #ifdef CONFIG_FUNCTION_ERROR_INJECTION
 140 #define ERROR_INJECT_WHITELIST()        STRUCT_ALIGN();                       \
 141                         VMLINUX_SYMBOL(__start_error_injection_whitelist) = .;\
 142                         KEEP(*(_error_injection_whitelist))                   \
 143                         VMLINUX_SYMBOL(__stop_error_injection_whitelist) = .;
 144 #else
 145 #define ERROR_INJECT_WHITELIST()
 146 #endif
 147
 148 #ifdef CONFIG_EVENT_TRACING
 149 #define FTRACE_EVENTS() . = ALIGN(8);                                   \
 150                         VMLINUX_SYMBOL(__start_ftrace_events) = .;      \
 151                         KEEP(*(_ftrace_events))                         \
 152                         VMLINUX_SYMBOL(__stop_ftrace_events) = .;       \
 153                         VMLINUX_SYMBOL(__start_ftrace_eval_maps) = .;   \
 154                         KEEP(*(_ftrace_eval_map))                       \
 155                         VMLINUX_SYMBOL(__stop_ftrace_eval_maps) = .;
 156 #else
 157 #define FTRACE_EVENTS()
 158 #endif
 159
 160 #ifdef CONFIG_TRACING
 161 #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .;      \
 162                          KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \
 163                          VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;
 164 #define TRACEPOINT_STR() VMLINUX_SYMBOL(__start___tracepoint_str) = .;  \
 165                          KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \
 166                          VMLINUX_SYMBOL(__stop___tracepoint_str) = .;
 167 #else
 168 #define TRACE_PRINTKS()
 169 #define TRACEPOINT_STR()
 170 #endif
 171
 172 #ifdef CONFIG_FTRACE_SYSCALLS
 173 #define TRACE_SYSCALLS() . = ALIGN(8);                                  \
 174                          VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \
 175                          KEEP(*(__syscalls_metadata))                   \
 176                          VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
 177 #else
 178 #define TRACE_SYSCALLS()
 179 #endif
 180
 181 #ifdef CONFIG_SERIAL_EARLYCON
 182 #define EARLYCON_TABLE() STRUCT_ALIGN();                        \
 183                          VMLINUX_SYMBOL(__earlycon_table) = .;  \
 184                          KEEP(*(__earlycon_table))              \
 185                          VMLINUX_SYMBOL(__earlycon_table_end) = .;
 186 #else
 187 #define EARLYCON_TABLE()
 188 #endif
 189
 190 #define ___OF_TABLE(cfg, name)  _OF_TABLE_##cfg(name)
 191 #define __OF_TABLE(cfg, name)   ___OF_TABLE(cfg, name)
 192 #define OF_TABLE(cfg, name)     __OF_TABLE(IS_ENABLED(cfg), name)
 193 #define _OF_TABLE_0(name)
 194 #define _OF_TABLE_1(name)                                               \
 195         . = ALIGN(8);                                                   \
 196         VMLINUX_SYMBOL(__##name##_of_table) = .;                        \
 197         KEEP(*(__##name##_of_table))                                    \
 198         KEEP(*(__##name##_of_table_end))
 199
 200 #define TIMER_OF_TABLES()       OF_TABLE(CONFIG_TIMER_OF, timer)
 201 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
 202 #define CLK_OF_TABLES()         OF_TABLE(CONFIG_COMMON_CLK, clk)
 203 #define IOMMU_OF_TABLES()       OF_TABLE(CONFIG_OF_IOMMU, iommu)
 204 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
 205 #define CPU_METHOD_OF_TABLES()  OF_TABLE(CONFIG_SMP, cpu_method)
 206 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method)
 207
 208 #ifdef CONFIG_ACPI
 209 #define ACPI_PROBE_TABLE(name)                                          \
 210         . = ALIGN(8);                                                   \
 211         VMLINUX_SYMBOL(__##name##_acpi_probe_table) = .;                \
 212         KEEP(*(__##name##_acpi_probe_table))                            \
 213         VMLINUX_SYMBOL(__##name##_acpi_probe_table_end) = .;
 214 #else
 215 #define ACPI_PROBE_TABLE(name)
 216 #endif
 217
 218 #define KERNEL_DTB()                                                    \
 219         STRUCT_ALIGN();                                                 \
 220         VMLINUX_SYMBOL(__dtb_start) = .;                                \
 221         KEEP(*(.dtb.init.rodata))                                       \
 222         VMLINUX_SYMBOL(__dtb_end) = .;
 223
 224 /*
 225  * .data section
 226  */
 227 #define DATA_DATA                                                       \
 228         *(.xiptext)                                                     \
 229         *(DATA_MAIN)                                                    \
 230         *(.ref.data)                                                    \
 231         *(.data..shared_aligned) /* percpu related */                   \
 232         MEM_KEEP(init.data)                                             \
 233         MEM_KEEP(exit.data)                                             \
 234         *(.data.unlikely)                                               \
 235         VMLINUX_SYMBOL(__start_once) = .;                               \
 236         *(.data.once)                                                   \
 237         VMLINUX_SYMBOL(__end_once) = .;                                 \
 238         STRUCT_ALIGN();                                                 \
 239         *(__tracepoints)                                                \
 240         /* implement dynamic printk debug */                            \
 241         . = ALIGN(8);                                                   \
 242         VMLINUX_SYMBOL(__start___jump_table) = .;                       \
 243         KEEP(*(__jump_table))                                           \
 244         VMLINUX_SYMBOL(__stop___jump_table) = .;                        \
 245         . = ALIGN(8);                                                   \
 246         VMLINUX_SYMBOL(__start___verbose) = .;                          \
 247         KEEP(*(__verbose))                                              \
 248         VMLINUX_SYMBOL(__stop___verbose) = .;                           \
 249         LIKELY_PROFILE()                                                \
 250         BRANCH_PROFILE()                                                \
 251         TRACE_PRINTKS()                                                 \
 252         TRACEPOINT_STR()
 253
 254 /*
 255  * Data section helpers
 256  */
 257 #define NOSAVE_DATA                                                     \
 258         . = ALIGN(PAGE_SIZE);                                           \
 259         VMLINUX_SYMBOL(__nosave_begin) = .;                             \
 260         *(.data..nosave)                                                \
 261         . = ALIGN(PAGE_SIZE);                                           \
 262         VMLINUX_SYMBOL(__nosave_end) = .;
 263
 264 #define PAGE_ALIGNED_DATA(page_align)                                   \
 265         . = ALIGN(page_align);                                          \
 266         *(.data..page_aligned)
 267
 268 #define READ_MOSTLY_DATA(align)                                         \
 269         . = ALIGN(align);                                               \
 270         *(.data..read_mostly)                                           \
 271         . = ALIGN(align);
 272
 273 #define CACHELINE_ALIGNED_DATA(align)                                   \
 274         . = ALIGN(align);                                               \
 275         *(.data..cacheline_aligned)
 276
 277 #define INIT_TASK_DATA(align)                                           \
 278         . = ALIGN(align);                                               \
 279         VMLINUX_SYMBOL(__start_init_task) = .;                          \
 280         VMLINUX_SYMBOL(init_thread_union) = .;                          \
 281         VMLINUX_SYMBOL(init_stack) = .;                                 \
 282         *(.data..init_task)                                             \
 283         *(.data..init_thread_info)                                      \
 284         . = VMLINUX_SYMBOL(__start_init_task) + THREAD_SIZE;            \
 285         VMLINUX_SYMBOL(__end_init_task) = .;
 286
 287 /*
 288  * Allow architectures to handle ro_after_init data on their
 289  * own by defining an empty RO_AFTER_INIT_DATA.
 290  */
 291 #ifndef RO_AFTER_INIT_DATA
 292 #define RO_AFTER_INIT_DATA                                              \
 293         VMLINUX_SYMBOL(__start_ro_after_init) = .;                      \
 294         *(.data..ro_after_init)                                         \
 295         VMLINUX_SYMBOL(__end_ro_after_init) = .;
 296 #endif
 297
 298 /*
 299  * Read only Data
 300  */
 301 #define RO_DATA_SECTION(align)                                          \
 302         . = ALIGN((align));                                             \
 303         .rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {           \
 304                 VMLINUX_SYMBOL(__start_rodata) = .;                     \
 305                 *(.rodata) *(.rodata.*)                                 \
 306                 RO_AFTER_INIT_DATA      /* Read only after init */      \
 307                 KEEP(*(__vermagic))     /* Kernel version magic */      \
 308                 . = ALIGN(8);                                           \
 309                 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .;         \
 310                 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \
 311                 VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .;          \
 312                 *(__tracepoints_strings)/* Tracepoints: strings */      \
 313         }                                                               \
 314                                                                         \
 315         .rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {          \
 316                 *(.rodata1)                                             \
 317         }                                                               \
 318                                                                         \
 319         /* PCI quirks */                                                \
 320         .pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {        \
 321                 VMLINUX_SYMBOL(__start_pci_fixups_early) = .;           \
 322                 KEEP(*(.pci_fixup_early))                               \
 323                 VMLINUX_SYMBOL(__end_pci_fixups_early) = .;             \
 324                 VMLINUX_SYMBOL(__start_pci_fixups_header) = .;          \
 325                 KEEP(*(.pci_fixup_header))                              \
 326                 VMLINUX_SYMBOL(__end_pci_fixups_header) = .;            \
 327                 VMLINUX_SYMBOL(__start_pci_fixups_final) = .;           \
 328                 KEEP(*(.pci_fixup_final))                               \
 329                 VMLINUX_SYMBOL(__end_pci_fixups_final) = .;             \
 330                 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .;          \
 331                 KEEP(*(.pci_fixup_enable))                              \
 332                 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .;            \
 333                 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .;          \
 334                 KEEP(*(.pci_fixup_resume))                              \
 335                 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .;            \
 336                 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .;    \
 337                 KEEP(*(.pci_fixup_resume_early))                        \
 338                 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .;      \
 339                 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .;         \
 340                 KEEP(*(.pci_fixup_suspend))                             \
 341                 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .;           \
 342                 VMLINUX_SYMBOL(__start_pci_fixups_suspend_late) = .;    \
 343                 KEEP(*(.pci_fixup_suspend_late))                        \
 344                 VMLINUX_SYMBOL(__end_pci_fixups_suspend_late) = .;      \
 345         }                                                               \
 346                                                                         \
 347         /* Built-in firmware blobs */                                   \
 348         .builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {      \
 349                 VMLINUX_SYMBOL(__start_builtin_fw) = .;                 \
 350                 KEEP(*(.builtin_fw))                                    \
 351                 VMLINUX_SYMBOL(__end_builtin_fw) = .;                   \
 352         }                                                               \
 353                                                                         \
 354         TRACEDATA                                                       \
 355                                                                         \
 356         /* Kernel symbol table: Normal symbols */                       \
 357         __ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {         \
 358                 VMLINUX_SYMBOL(__start___ksymtab) = .;                  \
 359                 KEEP(*(SORT(___ksymtab+*)))                             \
 360                 VMLINUX_SYMBOL(__stop___ksymtab) = .;                   \
 361         }                                                               \
 362                                                                         \
 363         /* Kernel symbol table: GPL-only symbols */                     \
 364         __ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {     \
 365                 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .;              \
 366                 KEEP(*(SORT(___ksymtab_gpl+*)))                         \
 367                 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .;               \
 368         }                                                               \
 369                                                                         \
 370         /* Kernel symbol table: Normal unused symbols */                \
 371         __ksymtab_unused  : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) {  \
 372                 VMLINUX_SYMBOL(__start___ksymtab_unused) = .;           \
 373                 KEEP(*(SORT(___ksymtab_unused+*)))                      \
 374                 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .;            \
 375         }                                                               \
 376                                                                         \
 377         /* Kernel symbol table: GPL-only unused symbols */              \
 378         __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
 379                 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .;       \
 380                 KEEP(*(SORT(___ksymtab_unused_gpl+*)))                  \
 381                 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .;        \
 382         }                                                               \
 383                                                                         \
 384         /* Kernel symbol table: GPL-future-only symbols */              \
 385         __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
 386                 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .;       \
 387                 KEEP(*(SORT(___ksymtab_gpl_future+*)))                  \
 388                 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .;        \
 389         }                                                               \
 390                                                                         \
 391         /* Kernel symbol table: Normal symbols */                       \
 392         __kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {         \
 393                 VMLINUX_SYMBOL(__start___kcrctab) = .;                  \
 394                 KEEP(*(SORT(___kcrctab+*)))                             \
 395                 VMLINUX_SYMBOL(__stop___kcrctab) = .;                   \
 396         }                                                               \
 397                                                                         \
 398         /* Kernel symbol table: GPL-only symbols */                     \
 399         __kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {     \
 400                 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .;              \
 401                 KEEP(*(SORT(___kcrctab_gpl+*)))                         \
 402                 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .;               \
 403         }                                                               \
 404                                                                         \
 405         /* Kernel symbol table: Normal unused symbols */                \
 406         __kcrctab_unused  : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) {  \
 407                 VMLINUX_SYMBOL(__start___kcrctab_unused) = .;           \
 408                 KEEP(*(SORT(___kcrctab_unused+*)))                      \
 409                 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .;            \
 410         }                                                               \
 411                                                                         \
 412         /* Kernel symbol table: GPL-only unused symbols */              \
 413         __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
 414                 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .;       \
 415                 KEEP(*(SORT(___kcrctab_unused_gpl+*)))                  \
 416                 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .;        \
 417         }                                                               \
 418                                                                         \
 419         /* Kernel symbol table: GPL-future-only symbols */              \
 420         __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
 421                 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .;       \
 422                 KEEP(*(SORT(___kcrctab_gpl_future+*)))                  \
 423                 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .;        \
 424         }                                                               \
 425                                                                         \
 426         /* Kernel symbol table: strings */                              \
 427         __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
 428                 *(__ksymtab_strings)                                    \
 429         }                                                               \
 430                                                                         \
 431         /* __*init sections */                                          \
 432         __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {         \
 433                 *(.ref.rodata)                                          \
 434                 MEM_KEEP(init.rodata)                                   \
 435                 MEM_KEEP(exit.rodata)                                   \
 436         }                                                               \
 437                                                                         \
 438         /* Built-in module parameters. */                               \
 439         __param : AT(ADDR(__param) - LOAD_OFFSET) {                     \
 440                 VMLINUX_SYMBOL(__start___param) = .;                    \
 441                 KEEP(*(__param))                                        \
 442                 VMLINUX_SYMBOL(__stop___param) = .;                     \
 443         }                                                               \
 444                                                                         \
 445         /* Built-in module versions. */                                 \
 446         __modver : AT(ADDR(__modver) - LOAD_OFFSET) {                   \
 447                 VMLINUX_SYMBOL(__start___modver) = .;                   \
 448                 KEEP(*(__modver))                                       \
 449                 VMLINUX_SYMBOL(__stop___modver) = .;                    \
 450                 . = ALIGN((align));                                     \
 451                 VMLINUX_SYMBOL(__end_rodata) = .;                       \
 452         }                                                               \
 453         . = ALIGN((align));
 454
 455 /* RODATA & RO_DATA provided for backward compatibility.
 456  * All archs are supposed to use RO_DATA() */
 457 #define RODATA          RO_DATA_SECTION(4096)
 458 #define RO_DATA(align)  RO_DATA_SECTION(align)
 459
 460 #define SECURITY_INIT                                                   \
 461         .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
 462                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 463                 KEEP(*(.security_initcall.init))                        \
 464                 VMLINUX_SYMBOL(__security_initcall_end) = .;            \
 465         }
 466
 467 /*
 468  * .text section. Map to function alignment to avoid address changes
 469  * during second ld run in second ld pass when generating System.map
 470  *
 471  * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead
 472  * code elimination is enabled, so these sections should be converted
 473  * to use ".." first.
 474  */
 475 #define TEXT_TEXT                                                       \
 476                 ALIGN_FUNCTION();                                       \
 477                 *(.text.hot TEXT_MAIN .text.fixup .text.unlikely)       \
 478                 *(.text..refcount)                                      \
 479                 *(.ref.text)                                            \
 480         MEM_KEEP(init.text)                                             \
 481         MEM_KEEP(exit.text)                                             \
 482
 483
 484 /* sched.text is aling to function alignment to secure we have same
 485  * address even at second ld pass when generating System.map */
 486 #define SCHED_TEXT                                                      \
 487                 ALIGN_FUNCTION();                                       \
 488                 VMLINUX_SYMBOL(__sched_text_start) = .;                 \
 489                 *(.sched.text)                                          \
 490                 VMLINUX_SYMBOL(__sched_text_end) = .;
 491
 492 /* spinlock.text is aling to function alignment to secure we have same
 493  * address even at second ld pass when generating System.map */
 494 #define LOCK_TEXT                                                       \
 495                 ALIGN_FUNCTION();                                       \
 496                 VMLINUX_SYMBOL(__lock_text_start) = .;                  \
 497                 *(.spinlock.text)                                       \
 498                 VMLINUX_SYMBOL(__lock_text_end) = .;
 499
 500 #define CPUIDLE_TEXT                                                    \
 501                 ALIGN_FUNCTION();                                       \
 502                 VMLINUX_SYMBOL(__cpuidle_text_start) = .;               \
 503                 *(.cpuidle.text)                                        \
 504                 VMLINUX_SYMBOL(__cpuidle_text_end) = .;
 505
 506 #define KPROBES_TEXT                                                    \
 507                 ALIGN_FUNCTION();                                       \
 508                 VMLINUX_SYMBOL(__kprobes_text_start) = .;               \
 509                 *(.kprobes.text)                                        \
 510                 VMLINUX_SYMBOL(__kprobes_text_end) = .;
 511
 512 #define ENTRY_TEXT                                                      \
 513                 ALIGN_FUNCTION();                                       \
 514                 VMLINUX_SYMBOL(__entry_text_start) = .;                 \
 515                 *(.entry.text)                                          \
 516                 VMLINUX_SYMBOL(__entry_text_end) = .;
 517
 518 #define IRQENTRY_TEXT                                                   \
 519                 ALIGN_FUNCTION();                                       \
 520                 VMLINUX_SYMBOL(__irqentry_text_start) = .;              \
 521                 *(.irqentry.text)                                       \
 522                 VMLINUX_SYMBOL(__irqentry_text_end) = .;
 523
 524 #define SOFTIRQENTRY_TEXT                                               \
 525                 ALIGN_FUNCTION();                                       \
 526                 VMLINUX_SYMBOL(__softirqentry_text_start) = .;          \
 527                 *(.softirqentry.text)                                   \
 528                 VMLINUX_SYMBOL(__softirqentry_text_end) = .;
 529
 530 /* Section used for early init (in .S files) */
 531 #define HEAD_TEXT  *(.head.text)
 532
 533 #define HEAD_TEXT_SECTION                                                       \
 534         .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {               \
 535                 HEAD_TEXT                                               \
 536         }
 537
 538 /*
 539  * Exception table
 540  */
 541 #define EXCEPTION_TABLE(align)                                          \
 542         . = ALIGN(align);                                               \
 543         __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {               \
 544                 VMLINUX_SYMBOL(__start___ex_table) = .;                 \
 545                 KEEP(*(__ex_table))                                     \
 546                 VMLINUX_SYMBOL(__stop___ex_table) = .;                  \
 547         }
 548
 549 /*
 550  * Init task
 551  */
 552 #define INIT_TASK_DATA_SECTION(align)                                   \
 553         . = ALIGN(align);                                               \
 554         .data..init_task :  AT(ADDR(.data..init_task) - LOAD_OFFSET) {  \
 555                 INIT_TASK_DATA(align)                                   \
 556         }
 557
 558 #ifdef CONFIG_CONSTRUCTORS
 559 #define KERNEL_CTORS()  . = ALIGN(8);                      \
 560                         VMLINUX_SYMBOL(__ctors_start) = .; \
 561                         KEEP(*(.ctors))                    \
 562                         KEEP(*(SORT(.init_array.*)))       \
 563                         KEEP(*(.init_array))               \
 564                         VMLINUX_SYMBOL(__ctors_end) = .;
 565 #else
 566 #define KERNEL_CTORS()
 567 #endif
 568
 569 /* init and exit section handling */
 570 #define INIT_DATA                                                       \
 571         KEEP(*(SORT(___kentry+*)))                                      \
 572         *(.init.data)                                                   \
 573         MEM_DISCARD(init.data)                                          \
 574         KERNEL_CTORS()                                                  \
 575         MCOUNT_REC()                                                    \
 576         *(.init.rodata)                                                 \
 577         FTRACE_EVENTS()                                                 \
 578         TRACE_SYSCALLS()                                                \
 579         KPROBE_BLACKLIST()                                              \
 580         ERROR_INJECT_WHITELIST()                                        \
 581         MEM_DISCARD(init.rodata)                                        \
 582         CLK_OF_TABLES()                                                 \
 583         RESERVEDMEM_OF_TABLES()                                         \
 584         TIMER_OF_TABLES()                                               \
 585         IOMMU_OF_TABLES()                                               \
 586         CPU_METHOD_OF_TABLES()                                          \
 587         CPUIDLE_METHOD_OF_TABLES()                                      \
 588         KERNEL_DTB()                                                    \
 589         IRQCHIP_OF_MATCH_TABLE()                                        \
 590         ACPI_PROBE_TABLE(irqchip)                                       \
 591         ACPI_PROBE_TABLE(timer)                                         \
 592         ACPI_PROBE_TABLE(iort)                                          \
 593         EARLYCON_TABLE()
 594
 595 #define INIT_TEXT                                                       \
 596         *(.init.text)                                                   \
 597         *(.text.startup)                                                \
 598         MEM_DISCARD(init.text)
 599
 600 #define EXIT_DATA                                                       \
 601         *(.exit.data)                                                   \
 602         *(.fini_array)                                                  \
 603         *(.dtors)                                                       \
 604         MEM_DISCARD(exit.data)                                          \
 605         MEM_DISCARD(exit.rodata)
 606
 607 #define EXIT_TEXT                                                       \
 608         *(.exit.text)                                                   \
 609         *(.text.exit)                                                   \
 610         MEM_DISCARD(exit.text)
 611
 612 #define EXIT_CALL                                                       \
 613         *(.exitcall.exit)
 614
 615 /*
 616  * bss (Block Started by Symbol) - uninitialized data
 617  * zeroed during startup
 618  */
 619 #define SBSS(sbss_align)                                                \
 620         . = ALIGN(sbss_align);                                          \
 621         .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {                         \
 622                 *(.dynsbss)                                             \
 623                 *(.sbss)                                                \
 624                 *(.scommon)                                             \
 625         }
 626
 627 /*
 628  * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
 629  * sections to the front of bss.
 630  */
 631 #ifndef BSS_FIRST_SECTIONS
 632 #define BSS_FIRST_SECTIONS
 633 #endif
 634
 635 #define BSS(bss_align)                                                  \
 636         . = ALIGN(bss_align);                                           \
 637         .bss : AT(ADDR(.bss) - LOAD_OFFSET) {                           \
 638                 BSS_FIRST_SECTIONS                                      \
 639                 *(.bss..page_aligned)                                   \
 640                 *(.dynbss)                                              \
 641                 *(BSS_MAIN)                                             \
 642                 *(COMMON)                                               \
 643         }
 644
 645 /*
 646  * DWARF debug sections.
 647  * Symbols in the DWARF debugging sections are relative to
 648  * the beginning of the section so we begin them at 0.
 649  */
 650 #define DWARF_DEBUG                                                     \
 651                 /* DWARF 1 */                                           \
 652                 .debug          0 : { *(.debug) }                       \
 653                 .line           0 : { *(.line) }                        \
 654                 /* GNU DWARF 1 extensions */                            \
 655                 .debug_srcinfo  0 : { *(.debug_srcinfo) }               \
 656                 .debug_sfnames  0 : { *(.debug_sfnames) }               \
 657                 /* DWARF 1.1 and DWARF 2 */                             \
 658                 .debug_aranges  0 : { *(.debug_aranges) }               \
 659                 .debug_pubnames 0 : { *(.debug_pubnames) }              \
 660                 /* DWARF 2 */                                           \
 661                 .debug_info     0 : { *(.debug_info                     \
 662                                 .gnu.linkonce.wi.*) }                   \
 663                 .debug_abbrev   0 : { *(.debug_abbrev) }                \
 664                 .debug_line     0 : { *(.debug_line) }                  \
 665                 .debug_frame    0 : { *(.debug_frame) }                 \
 666                 .debug_str      0 : { *(.debug_str) }                   \
 667                 .debug_loc      0 : { *(.debug_loc) }                   \
 668                 .debug_macinfo  0 : { *(.debug_macinfo) }               \
 669                 .debug_pubtypes 0 : { *(.debug_pubtypes) }              \
 670                 /* DWARF 3 */                                           \
 671                 .debug_ranges   0 : { *(.debug_ranges) }                \
 672                 /* SGI/MIPS DWARF 2 extensions */                       \
 673                 .debug_weaknames 0 : { *(.debug_weaknames) }            \
 674                 .debug_funcnames 0 : { *(.debug_funcnames) }            \
 675                 .debug_typenames 0 : { *(.debug_typenames) }            \
 676                 .debug_varnames  0 : { *(.debug_varnames) }             \
 677                 /* GNU DWARF 2 extensions */                            \
 678                 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) }      \
 679                 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) }      \
 680                 /* DWARF 4 */                                           \
 681                 .debug_types    0 : { *(.debug_types) }                 \
 682                 /* DWARF 5 */                                           \
 683                 .debug_macro    0 : { *(.debug_macro) }                 \
 684                 .debug_addr     0 : { *(.debug_addr) }
 685
 686                 /* Stabs debugging sections.  */
 687 #define STABS_DEBUG                                                     \
 688                 .stab 0 : { *(.stab) }                                  \
 689                 .stabstr 0 : { *(.stabstr) }                            \
 690                 .stab.excl 0 : { *(.stab.excl) }                        \
 691                 .stab.exclstr 0 : { *(.stab.exclstr) }                  \
 692                 .stab.index 0 : { *(.stab.index) }                      \
 693                 .stab.indexstr 0 : { *(.stab.indexstr) }                \
 694                 .comment 0 : { *(.comment) }
 695
 696 #ifdef CONFIG_GENERIC_BUG
 697 #define BUG_TABLE                                                       \
 698         . = ALIGN(8);                                                   \
 699         __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {             \
 700                 VMLINUX_SYMBOL(__start___bug_table) = .;                \
 701                 KEEP(*(__bug_table))                                    \
 702                 VMLINUX_SYMBOL(__stop___bug_table) = .;                 \
 703         }
 704 #else
 705 #define BUG_TABLE
 706 #endif
 707
 708 #ifdef CONFIG_UNWINDER_ORC
 709 #define ORC_UNWIND_TABLE                                                \
 710         . = ALIGN(4);                                                   \
 711         .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) {       \
 712                 VMLINUX_SYMBOL(__start_orc_unwind_ip) = .;              \
 713                 KEEP(*(.orc_unwind_ip))                                 \
 714                 VMLINUX_SYMBOL(__stop_orc_unwind_ip) = .;               \
 715         }                                                               \
 716         . = ALIGN(6);                                                   \
 717         .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) {             \
 718                 VMLINUX_SYMBOL(__start_orc_unwind) = .;                 \
 719                 KEEP(*(.orc_unwind))                                    \
 720                 VMLINUX_SYMBOL(__stop_orc_unwind) = .;                  \
 721         }                                                               \
 722         . = ALIGN(4);                                                   \
 723         .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) {             \
 724                 VMLINUX_SYMBOL(orc_lookup) = .;                         \
 725                 . += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) /        \
 726                         LOOKUP_BLOCK_SIZE) + 1) * 4;                    \
 727                 VMLINUX_SYMBOL(orc_lookup_end) = .;                     \
 728         }
 729 #else
 730 #define ORC_UNWIND_TABLE
 731 #endif
 732
 733 #ifdef CONFIG_PM_TRACE
 734 #define TRACEDATA                                                       \
 735         . = ALIGN(4);                                                   \
 736         .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {               \
 737                 VMLINUX_SYMBOL(__tracedata_start) = .;                  \
 738                 KEEP(*(.tracedata))                                     \
 739                 VMLINUX_SYMBOL(__tracedata_end) = .;                    \
 740         }
 741 #else
 742 #define TRACEDATA
 743 #endif
 744
 745 #define NOTES                                                           \
 746         .notes : AT(ADDR(.notes) - LOAD_OFFSET) {                       \
 747                 VMLINUX_SYMBOL(__start_notes) = .;                      \
 748                 *(.note.*)                                              \
 749                 VMLINUX_SYMBOL(__stop_notes) = .;                       \
 750         }
 751
 752 #define INIT_SETUP(initsetup_align)                                     \
 753                 . = ALIGN(initsetup_align);                             \
 754                 VMLINUX_SYMBOL(__setup_start) = .;                      \
 755                 KEEP(*(.init.setup))                                    \
 756                 VMLINUX_SYMBOL(__setup_end) = .;
 757
 758 #define INIT_CALLS_LEVEL(level)                                         \
 759                 VMLINUX_SYMBOL(__initcall##level##_start) = .;          \
 760                 KEEP(*(.initcall##level##.init))                        \
 761                 KEEP(*(.initcall##level##s.init))                       \
 762
 763 #define INIT_CALLS                                                      \
 764                 VMLINUX_SYMBOL(__initcall_start) = .;                   \
 765                 KEEP(*(.initcallearly.init))                            \
 766                 INIT_CALLS_LEVEL(0)                                     \
 767                 INIT_CALLS_LEVEL(1)                                     \
 768                 INIT_CALLS_LEVEL(2)                                     \
 769                 INIT_CALLS_LEVEL(3)                                     \
 770                 INIT_CALLS_LEVEL(4)                                     \
 771                 INIT_CALLS_LEVEL(5)                                     \
 772                 INIT_CALLS_LEVEL(rootfs)                                \
 773                 INIT_CALLS_LEVEL(6)                                     \
 774                 INIT_CALLS_LEVEL(7)                                     \
 775                 VMLINUX_SYMBOL(__initcall_end) = .;
 776
 777 #define CON_INITCALL                                                    \
 778                 VMLINUX_SYMBOL(__con_initcall_start) = .;               \
 779                 KEEP(*(.con_initcall.init))                             \
 780                 VMLINUX_SYMBOL(__con_initcall_end) = .;
 781
 782 #define SECURITY_INITCALL                                               \
 783                 VMLINUX_SYMBOL(__security_initcall_start) = .;          \
 784                 KEEP(*(.security_initcall.init))                        \
 785                 VMLINUX_SYMBOL(__security_initcall_end) = .;
 786
 787 #ifdef CONFIG_BLK_DEV_INITRD
 788 #define INIT_RAM_FS                                                     \
 789         . = ALIGN(4);                                                   \
 790         VMLINUX_SYMBOL(__initramfs_start) = .;                          \
 791         KEEP(*(.init.ramfs))                                            \
 792         . = ALIGN(8);                                                   \
 793         KEEP(*(.init.ramfs.info))
 794 #else
 795 #define INIT_RAM_FS
 796 #endif
 797
 798 /*
 799  * Memory encryption operates on a page basis. Since we need to clear
 800  * the memory encryption mask for this section, it needs to be aligned
 801  * on a page boundary and be a page-size multiple in length.
 802  *
 803  * Note: We use a separate section so that only this section gets
 804  * decrypted to avoid exposing more than we wish.
 805  */
 806 #ifdef CONFIG_AMD_MEM_ENCRYPT
 807 #define PERCPU_DECRYPTED_SECTION                                        \
 808         . = ALIGN(PAGE_SIZE);                                           \
 809         *(.data..percpu..decrypted)                                     \
 810         . = ALIGN(PAGE_SIZE);
 811 #else
 812 #define PERCPU_DECRYPTED_SECTION
 813 #endif
 814
 815
 816 /*
 817  * Default discarded sections.
 818  *
 819  * Some archs want to discard exit text/data at runtime rather than
 820  * link time due to cross-section references such as alt instructions,
 821  * bug table, eh_frame, etc.  DISCARDS must be the last of output
 822  * section definitions so that such archs put those in earlier section
 823  * definitions.
 824  */
 825 #define DISCARDS                                                        \
 826         /DISCARD/ : {                                                   \
 827         EXIT_TEXT                                                       \
 828         EXIT_DATA                                                       \
 829         EXIT_CALL                                                       \
 830         *(.discard)                                                     \
 831         *(.discard.*)                                                   \
 832         }
 833
 834 /**
 835  * PERCPU_INPUT - the percpu input sections
 836  * @cacheline: cacheline size
 837  *
 838  * The core percpu section names and core symbols which do not rely
 839  * directly upon load addresses.
 840  *
 841  * @cacheline is used to align subsections to avoid false cacheline
 842  * sharing between subsections for different purposes.
 843  */
 844 #define PERCPU_INPUT(cacheline)                                         \
 845         VMLINUX_SYMBOL(__per_cpu_start) = .;                            \
 846         *(.data..percpu..first)                                         \
 847         . = ALIGN(PAGE_SIZE);                                           \
 848         *(.data..percpu..page_aligned)                                  \
 849         . = ALIGN(cacheline);                                           \
 850         *(.data..percpu..read_mostly)                                   \
 851         . = ALIGN(cacheline);                                           \
 852         *(.data..percpu)                                                \
 853         *(.data..percpu..shared_aligned)                                \
 854         PERCPU_DECRYPTED_SECTION                                        \
 855         VMLINUX_SYMBOL(__per_cpu_end) = .;
 856
 857 /**
 858  * PERCPU_VADDR - define output section for percpu area
 859  * @cacheline: cacheline size
 860  * @vaddr: explicit base address (optional)
 861  * @phdr: destination PHDR (optional)
 862  *
 863  * Macro which expands to output section for percpu area.
 864  *
 865  * @cacheline is used to align subsections to avoid false cacheline
 866  * sharing between subsections for different purposes.
 867  *
 868  * If @vaddr is not blank, it specifies explicit base address and all
 869  * percpu symbols will be offset from the given address.  If blank,
 870  * @vaddr always equals @laddr + LOAD_OFFSET.
 871  *
 872  * @phdr defines the output PHDR to use if not blank.  Be warned that
 873  * output PHDR is sticky.  If @phdr is specified, the next output
 874  * section in the linker script will go there too.  @phdr should have
 875  * a leading colon.
 876  *
 877  * Note that this macros defines __per_cpu_load as an absolute symbol.
 878  * If there is no need to put the percpu section at a predetermined
 879  * address, use PERCPU_SECTION.
 880  */
 881 #define PERCPU_VADDR(cacheline, vaddr, phdr)                            \
 882         VMLINUX_SYMBOL(__per_cpu_load) = .;                             \
 883         .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load)         \
 884                                 - LOAD_OFFSET) {                        \
 885                 PERCPU_INPUT(cacheline)                                 \
 886         } phdr                                                          \
 887         . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
 888
 889 /**
 890  * PERCPU_SECTION - define output section for percpu area, simple version
 891  * @cacheline: cacheline size
 892  *
 893  * Align to PAGE_SIZE and outputs output section for percpu area.  This
 894  * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
 895  * __per_cpu_start will be identical.
 896  *
 897  * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
 898  * except that __per_cpu_load is defined as a relative symbol against
 899  * .data..percpu which is required for relocatable x86_32 configuration.
 900  */
 901 #define PERCPU_SECTION(cacheline)                                       \
 902         . = ALIGN(PAGE_SIZE);                                           \
 903         .data..percpu   : AT(ADDR(.data..percpu) - LOAD_OFFSET) {       \
 904                 VMLINUX_SYMBOL(__per_cpu_load) = .;                     \
 905                 PERCPU_INPUT(cacheline)                                 \
 906         }
 907
 908
 909 /*
 910  * Definition of the high level *_SECTION macros
 911  * They will fit only a subset of the architectures
 912  */
 913
 914
 915 /*
 916  * Writeable data.
 917  * All sections are combined in a single .data section.
 918  * The sections following CONSTRUCTORS are arranged so their
 919  * typical alignment matches.
 920  * A cacheline is typical/always less than a PAGE_SIZE so
 921  * the sections that has this restriction (or similar)
 922  * is located before the ones requiring PAGE_SIZE alignment.
 923  * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
 924  * matches the requirement of PAGE_ALIGNED_DATA.
 925  *
 926  * use 0 as page_align if page_aligned data is not used */
 927 #define RW_DATA_SECTION(cacheline, pagealigned, inittask)               \
 928         . = ALIGN(PAGE_SIZE);                                           \
 929         .data : AT(ADDR(.data) - LOAD_OFFSET) {                         \
 930                 INIT_TASK_DATA(inittask)                                \
 931                 NOSAVE_DATA                                             \
 932                 PAGE_ALIGNED_DATA(pagealigned)                          \
 933                 CACHELINE_ALIGNED_DATA(cacheline)                       \
 934                 READ_MOSTLY_DATA(cacheline)                             \
 935                 DATA_DATA                                               \
 936                 CONSTRUCTORS                                            \
 937         }                                                               \
 938         BUG_TABLE                                                       \
 939
 940 #define INIT_TEXT_SECTION(inittext_align)                               \
 941         . = ALIGN(inittext_align);                                      \
 942         .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {               \
 943                 VMLINUX_SYMBOL(_sinittext) = .;                         \
 944                 INIT_TEXT                                               \
 945                 VMLINUX_SYMBOL(_einittext) = .;                         \
 946         }
 947
 948 #define INIT_DATA_SECTION(initsetup_align)                              \
 949         .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {               \
 950                 INIT_DATA                                               \
 951                 INIT_SETUP(initsetup_align)                             \
 952                 INIT_CALLS                                              \
 953                 CON_INITCALL                                            \
 954                 SECURITY_INITCALL                                       \
 955                 INIT_RAM_FS                                             \
 956         }
 957
 958 #define BSS_SECTION(sbss_align, bss_align, stop_align)                  \
 959         . = ALIGN(sbss_align);                                          \
 960         VMLINUX_SYMBOL(__bss_start) = .;                                \
 961         SBSS(sbss_align)                                                \
 962         BSS(bss_align)                                                  \
 963         . = ALIGN(stop_align);                                          \
 964         VMLINUX_SYMBOL(__bss_stop) = .;