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