arch/arm/kernel/vmlinux.lds.S

   1 /* ld script to make ARM Linux kernel
   2  * taken from the i386 version by Russell King
   3  * Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>
   4  */
   5
   6 #ifdef CONFIG_XIP_KERNEL
   7 #include "vmlinux-xip.lds.S"
   8 #else
   9
  10 #include <asm-generic/vmlinux.lds.h>
  11 #include <asm/cache.h>
  12 #include <asm/thread_info.h>
  13 #include <asm/memory.h>
  14 #include <asm/page.h>
  15 #include <asm/pgtable.h>
  16
  17 #define PROC_INFO                                                       \
  18         . = ALIGN(4);                                                   \
  19         VMLINUX_SYMBOL(__proc_info_begin) = .;                          \
  20         *(.proc.info.init)                                              \
  21         VMLINUX_SYMBOL(__proc_info_end) = .;
  22
  23 #define HYPERVISOR_TEXT                                                 \
  24         VMLINUX_SYMBOL(__hyp_text_start) = .;                           \
  25         *(.hyp.text)                                                    \
  26         VMLINUX_SYMBOL(__hyp_text_end) = .;
  27
  28 #define IDMAP_TEXT                                                      \
  29         ALIGN_FUNCTION();                                               \
  30         VMLINUX_SYMBOL(__idmap_text_start) = .;                         \
  31         *(.idmap.text)                                                  \
  32         VMLINUX_SYMBOL(__idmap_text_end) = .;                           \
  33         . = ALIGN(PAGE_SIZE);                                           \
  34         VMLINUX_SYMBOL(__hyp_idmap_text_start) = .;                     \
  35         *(.hyp.idmap.text)                                              \
  36         VMLINUX_SYMBOL(__hyp_idmap_text_end) = .;
  37
  38 #ifdef CONFIG_HOTPLUG_CPU
  39 #define ARM_CPU_DISCARD(x)
  40 #define ARM_CPU_KEEP(x)         x
  41 #else
  42 #define ARM_CPU_DISCARD(x)      x
  43 #define ARM_CPU_KEEP(x)
  44 #endif
  45
  46 #if (defined(CONFIG_SMP_ON_UP) && !defined(CONFIG_DEBUG_SPINLOCK)) || \
  47         defined(CONFIG_GENERIC_BUG)
  48 #define ARM_EXIT_KEEP(x)        x
  49 #define ARM_EXIT_DISCARD(x)
  50 #else
  51 #define ARM_EXIT_KEEP(x)
  52 #define ARM_EXIT_DISCARD(x)     x
  53 #endif
  54
  55 OUTPUT_ARCH(arm)
  56 ENTRY(stext)
  57
  58 #ifndef __ARMEB__
  59 jiffies = jiffies_64;
  60 #else
  61 jiffies = jiffies_64 + 4;
  62 #endif
  63
  64 SECTIONS
  65 {
  66         /*
  67          * XXX: The linker does not define how output sections are
  68          * assigned to input sections when there are multiple statements
  69          * matching the same input section name.  There is no documented
  70          * order of matching.
  71          *
  72          * unwind exit sections must be discarded before the rest of the
  73          * unwind sections get included.
  74          */
  75         /DISCARD/ : {
  76                 *(.ARM.exidx.exit.text)
  77                 *(.ARM.extab.exit.text)
  78                 ARM_CPU_DISCARD(*(.ARM.exidx.cpuexit.text))
  79                 ARM_CPU_DISCARD(*(.ARM.extab.cpuexit.text))
  80                 ARM_EXIT_DISCARD(EXIT_TEXT)
  81                 ARM_EXIT_DISCARD(EXIT_DATA)
  82                 EXIT_CALL
  83 #ifndef CONFIG_MMU
  84                 *(.text.fixup)
  85                 *(__ex_table)
  86 #endif
  87 #ifndef CONFIG_SMP_ON_UP
  88                 *(.alt.smp.init)
  89 #endif
  90                 *(.discard)
  91                 *(.discard.*)
  92         }
  93
  94         . = PAGE_OFFSET + TEXT_OFFSET;
  95         .head.text : {
  96                 _text = .;
  97                 HEAD_TEXT
  98         }
  99
 100 #ifdef CONFIG_DEBUG_RODATA
 101         . = ALIGN(1<<SECTION_SHIFT);
 102 #endif
 103
 104         .text : {                       /* Real text segment            */
 105                 _stext = .;             /* Text and read-only data      */
 106                         IDMAP_TEXT
 107                         __exception_text_start = .;
 108                         *(.exception.text)
 109                         __exception_text_end = .;
 110                         IRQENTRY_TEXT
 111                         SOFTIRQENTRY_TEXT
 112                         TEXT_TEXT
 113                         SCHED_TEXT
 114                         LOCK_TEXT
 115                         HYPERVISOR_TEXT
 116                         KPROBES_TEXT
 117                         *(.gnu.warning)
 118                         *(.glue_7)
 119                         *(.glue_7t)
 120                 . = ALIGN(4);
 121                 *(.got)                 /* Global offset table          */
 122                         ARM_CPU_KEEP(PROC_INFO)
 123         }
 124
 125 #ifdef CONFIG_DEBUG_ALIGN_RODATA
 126         . = ALIGN(1<<SECTION_SHIFT);
 127 #endif
 128         RO_DATA(PAGE_SIZE)
 129
 130         . = ALIGN(4);
 131         __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
 132                 __start___ex_table = .;
 133 #ifdef CONFIG_MMU
 134                 *(__ex_table)
 135 #endif
 136                 __stop___ex_table = .;
 137         }
 138
 139 #ifdef CONFIG_ARM_UNWIND
 140         /*
 141          * Stack unwinding tables
 142          */
 143         . = ALIGN(8);
 144         .ARM.unwind_idx : {
 145                 __start_unwind_idx = .;
 146                 *(.ARM.exidx*)
 147                 __stop_unwind_idx = .;
 148         }
 149         .ARM.unwind_tab : {
 150                 __start_unwind_tab = .;
 151                 *(.ARM.extab*)
 152                 __stop_unwind_tab = .;
 153         }
 154 #endif
 155
 156         NOTES
 157
 158         _etext = .;                     /* End of text and rodata section */
 159
 160 #ifdef CONFIG_DEBUG_RODATA
 161         . = ALIGN(1<<SECTION_SHIFT);
 162 #else
 163         . = ALIGN(PAGE_SIZE);
 164 #endif
 165         __init_begin = .;
 166
 167         /*
 168          * The vectors and stubs are relocatable code, and the
 169          * only thing that matters is their relative offsets
 170          */
 171         __vectors_start = .;
 172         .vectors 0xffff0000 : AT(__vectors_start) {
 173                 *(.vectors)
 174         }
 175         . = __vectors_start + SIZEOF(.vectors);
 176         __vectors_end = .;
 177
 178         __stubs_start = .;
 179         .stubs ADDR(.vectors) + 0x1000 : AT(__stubs_start) {
 180                 *(.stubs)
 181         }
 182         . = __stubs_start + SIZEOF(.stubs);
 183         __stubs_end = .;
 184
 185         PROVIDE(vector_fiq_offset = vector_fiq - ADDR(.vectors));
 186
 187         INIT_TEXT_SECTION(8)
 188         .exit.text : {
 189                 ARM_EXIT_KEEP(EXIT_TEXT)
 190         }
 191         .init.proc.info : {
 192                 ARM_CPU_DISCARD(PROC_INFO)
 193         }
 194         .init.arch.info : {
 195                 __arch_info_begin = .;
 196                 *(.arch.info.init)
 197                 __arch_info_end = .;
 198         }
 199         .init.tagtable : {
 200                 __tagtable_begin = .;
 201                 *(.taglist.init)
 202                 __tagtable_end = .;
 203         }
 204 #ifdef CONFIG_SMP_ON_UP
 205         .init.smpalt : {
 206                 __smpalt_begin = .;
 207                 *(.alt.smp.init)
 208                 __smpalt_end = .;
 209         }
 210 #endif
 211         .init.pv_table : {
 212                 __pv_table_begin = .;
 213                 *(.pv_table)
 214                 __pv_table_end = .;
 215         }
 216         .init.data : {
 217                 INIT_DATA
 218                 INIT_SETUP(16)
 219                 INIT_CALLS
 220                 CON_INITCALL
 221                 SECURITY_INITCALL
 222                 INIT_RAM_FS
 223         }
 224         .exit.data : {
 225                 ARM_EXIT_KEEP(EXIT_DATA)
 226         }
 227
 228 #ifdef CONFIG_SMP
 229         PERCPU_SECTION(L1_CACHE_BYTES)
 230 #endif
 231
 232 #ifdef CONFIG_DEBUG_RODATA
 233         . = ALIGN(1<<SECTION_SHIFT);
 234 #else
 235         . = ALIGN(THREAD_SIZE);
 236 #endif
 237         __init_end = .;
 238         __data_loc = .;
 239
 240         .data : AT(__data_loc) {
 241                 _data = .;              /* address in memory */
 242                 _sdata = .;
 243
 244                 /*
 245                  * first, the init task union, aligned
 246                  * to an 8192 byte boundary.
 247                  */
 248                 INIT_TASK_DATA(THREAD_SIZE)
 249
 250                 NOSAVE_DATA
 251                 CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES)
 252                 READ_MOSTLY_DATA(L1_CACHE_BYTES)
 253
 254                 /*
 255                  * and the usual data section
 256                  */
 257                 DATA_DATA
 258                 CONSTRUCTORS
 259
 260                 _edata = .;
 261         }
 262         _edata_loc = __data_loc + SIZEOF(.data);
 263
 264 #ifdef CONFIG_HAVE_TCM
 265         /*
 266          * We align everything to a page boundary so we can
 267          * free it after init has commenced and TCM contents have
 268          * been copied to its destination.
 269          */
 270         .tcm_start : {
 271                 . = ALIGN(PAGE_SIZE);
 272                 __tcm_start = .;
 273                 __itcm_start = .;
 274         }
 275
 276         /*
 277          * Link these to the ITCM RAM
 278          * Put VMA to the TCM address and LMA to the common RAM
 279          * and we'll upload the contents from RAM to TCM and free
 280          * the used RAM after that.
 281          */
 282         .text_itcm ITCM_OFFSET : AT(__itcm_start)
 283         {
 284                 __sitcm_text = .;
 285                 *(.tcm.text)
 286                 *(.tcm.rodata)
 287                 . = ALIGN(4);
 288                 __eitcm_text = .;
 289         }
 290
 291         /*
 292          * Reset the dot pointer, this is needed to create the
 293          * relative __dtcm_start below (to be used as extern in code).
 294          */
 295         . = ADDR(.tcm_start) + SIZEOF(.tcm_start) + SIZEOF(.text_itcm);
 296
 297         .dtcm_start : {
 298                 __dtcm_start = .;
 299         }
 300
 301         /* TODO: add remainder of ITCM as well, that can be used for data! */
 302         .data_dtcm DTCM_OFFSET : AT(__dtcm_start)
 303         {
 304                 . = ALIGN(4);
 305                 __sdtcm_data = .;
 306                 *(.tcm.data)
 307                 . = ALIGN(4);
 308                 __edtcm_data = .;
 309         }
 310
 311         /* Reset the dot pointer or the linker gets confused */
 312         . = ADDR(.dtcm_start) + SIZEOF(.data_dtcm);
 313
 314         /* End marker for freeing TCM copy in linked object */
 315         .tcm_end : AT(ADDR(.dtcm_start) + SIZEOF(.data_dtcm)){
 316                 . = ALIGN(PAGE_SIZE);
 317                 __tcm_end = .;
 318         }
 319 #endif
 320
 321         BSS_SECTION(0, 0, 0)
 322         _end = .;
 323
 324         STABS_DEBUG
 325 }
 326
 327 #ifdef CONFIG_DEBUG_RODATA
 328 /*
 329  * Without CONFIG_DEBUG_ALIGN_RODATA, __start_rodata_section_aligned will
 330  * be the first section-aligned location after __start_rodata. Otherwise,
 331  * it will be equal to __start_rodata.
 332  */
 333 __start_rodata_section_aligned = ALIGN(__start_rodata, 1 << SECTION_SHIFT);
 334 #endif
 335
 336 /*
 337  * These must never be empty
 338  * If you have to comment these two assert statements out, your
 339  * binutils is too old (for other reasons as well)
 340  */
 341 ASSERT((__proc_info_end - __proc_info_begin), "missing CPU support")
 342 ASSERT((__arch_info_end - __arch_info_begin), "no machine record defined")
 343
 344 /*
 345  * The HYP init code can't be more than a page long,
 346  * and should not cross a page boundary.
 347  * The above comment applies as well.
 348  */
 349 ASSERT(__hyp_idmap_text_end - (__hyp_idmap_text_start & PAGE_MASK) <= PAGE_SIZE,
 350         "HYP init code too big or misaligned")
 351
 352 #endif /* CONFIG_XIP_KERNEL */