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