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 /* No __ro_after_init data in the .rodata section - which will always be ro */
   7 #define RO_AFTER_INIT_DATA
   8
   9 #include <asm-generic/vmlinux.lds.h>
  10 #include <asm/cache.h>
  11 #include <asm/thread_info.h>
  12 #include <asm/memory.h>
  13 #include <asm/page.h>
  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         . = XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR);
  88         _xiprom = .;                    /* XIP ROM area to be mapped */
  89
  90         .head.text : {
  91                 _text = .;
  92                 HEAD_TEXT
  93         }
  94
  95         .text : {                       /* Real text segment            */
  96                 _stext = .;             /* Text and read-only data      */
  97                         IDMAP_TEXT
  98                         __exception_text_start = .;
  99                         *(.exception.text)
 100                         __exception_text_end = .;
 101                         IRQENTRY_TEXT
 102                         TEXT_TEXT
 103                         SCHED_TEXT
 104                         CPUIDLE_TEXT
 105                         LOCK_TEXT
 106                         KPROBES_TEXT
 107                         *(.gnu.warning)
 108                         *(.glue_7)
 109                         *(.glue_7t)
 110                 . = ALIGN(4);
 111                 *(.got)                 /* Global offset table          */
 112                         ARM_CPU_KEEP(PROC_INFO)
 113         }
 114
 115         RO_DATA(PAGE_SIZE)
 116
 117         . = ALIGN(4);
 118         __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
 119                 __start___ex_table = .;
 120 #ifdef CONFIG_MMU
 121                 *(__ex_table)
 122 #endif
 123                 __stop___ex_table = .;
 124         }
 125
 126 #ifdef CONFIG_ARM_UNWIND
 127         /*
 128          * Stack unwinding tables
 129          */
 130         . = ALIGN(8);
 131         .ARM.unwind_idx : {
 132                 __start_unwind_idx = .;
 133                 *(.ARM.exidx*)
 134                 __stop_unwind_idx = .;
 135         }
 136         .ARM.unwind_tab : {
 137                 __start_unwind_tab = .;
 138                 *(.ARM.extab*)
 139                 __stop_unwind_tab = .;
 140         }
 141 #endif
 142
 143         NOTES
 144
 145         _etext = .;                     /* End of text and rodata section */
 146
 147         /*
 148          * The vectors and stubs are relocatable code, and the
 149          * only thing that matters is their relative offsets
 150          */
 151         __vectors_start = .;
 152         .vectors 0xffff0000 : AT(__vectors_start) {
 153                 *(.vectors)
 154         }
 155         . = __vectors_start + SIZEOF(.vectors);
 156         __vectors_end = .;
 157
 158         __stubs_start = .;
 159         .stubs ADDR(.vectors) + 0x1000 : AT(__stubs_start) {
 160                 *(.stubs)
 161         }
 162         . = __stubs_start + SIZEOF(.stubs);
 163         __stubs_end = .;
 164
 165         PROVIDE(vector_fiq_offset = vector_fiq - ADDR(.vectors));
 166
 167         INIT_TEXT_SECTION(8)
 168         .exit.text : {
 169                 ARM_EXIT_KEEP(EXIT_TEXT)
 170         }
 171         .init.proc.info : {
 172                 ARM_CPU_DISCARD(PROC_INFO)
 173         }
 174         .init.arch.info : {
 175                 __arch_info_begin = .;
 176                 *(.arch.info.init)
 177                 __arch_info_end = .;
 178         }
 179         .init.tagtable : {
 180                 __tagtable_begin = .;
 181                 *(.taglist.init)
 182                 __tagtable_end = .;
 183         }
 184 #ifdef CONFIG_SMP_ON_UP
 185         .init.smpalt : {
 186                 __smpalt_begin = .;
 187                 *(.alt.smp.init)
 188                 __smpalt_end = .;
 189         }
 190 #endif
 191         .init.pv_table : {
 192                 __pv_table_begin = .;
 193                 *(.pv_table)
 194                 __pv_table_end = .;
 195         }
 196         .init.data : {
 197                 INIT_SETUP(16)
 198                 INIT_CALLS
 199                 CON_INITCALL
 200                 SECURITY_INITCALL
 201                 INIT_RAM_FS
 202         }
 203
 204 #ifdef CONFIG_SMP
 205         PERCPU_SECTION(L1_CACHE_BYTES)
 206 #endif
 207
 208         _exiprom = .;                   /* End of XIP ROM area */
 209         __data_loc = ALIGN(4);          /* location in binary */
 210         . = PAGE_OFFSET + TEXT_OFFSET;
 211
 212         .data : AT(__data_loc) {
 213                 _data = .;              /* address in memory */
 214                 _sdata = .;
 215
 216                 /*
 217                  * first, the init task union, aligned
 218                  * to an 8192 byte boundary.
 219                  */
 220                 INIT_TASK_DATA(THREAD_SIZE)
 221
 222                 . = ALIGN(PAGE_SIZE);
 223                 __init_begin = .;
 224                 INIT_DATA
 225                 ARM_EXIT_KEEP(EXIT_DATA)
 226                 . = ALIGN(PAGE_SIZE);
 227                 __init_end = .;
 228
 229                 *(.data..ro_after_init)
 230
 231                 NOSAVE_DATA
 232                 CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES)
 233                 READ_MOSTLY_DATA(L1_CACHE_BYTES)
 234
 235                 /*
 236                  * and the usual data section
 237                  */
 238                 DATA_DATA
 239                 CONSTRUCTORS
 240
 241                 _edata = .;
 242         }
 243         _edata_loc = __data_loc + SIZEOF(.data);
 244
 245         BUG_TABLE
 246
 247 #ifdef CONFIG_HAVE_TCM
 248         /*
 249          * We align everything to a page boundary so we can
 250          * free it after init has commenced and TCM contents have
 251          * been copied to its destination.
 252          */
 253         .tcm_start : {
 254                 . = ALIGN(PAGE_SIZE);
 255                 __tcm_start = .;
 256                 __itcm_start = .;
 257         }
 258
 259         /*
 260          * Link these to the ITCM RAM
 261          * Put VMA to the TCM address and LMA to the common RAM
 262          * and we'll upload the contents from RAM to TCM and free
 263          * the used RAM after that.
 264          */
 265         .text_itcm ITCM_OFFSET : AT(__itcm_start)
 266         {
 267                 __sitcm_text = .;
 268                 *(.tcm.text)
 269                 *(.tcm.rodata)
 270                 . = ALIGN(4);
 271                 __eitcm_text = .;
 272         }
 273
 274         /*
 275          * Reset the dot pointer, this is needed to create the
 276          * relative __dtcm_start below (to be used as extern in code).
 277          */
 278         . = ADDR(.tcm_start) + SIZEOF(.tcm_start) + SIZEOF(.text_itcm);
 279
 280         .dtcm_start : {
 281                 __dtcm_start = .;
 282         }
 283
 284         /* TODO: add remainder of ITCM as well, that can be used for data! */
 285         .data_dtcm DTCM_OFFSET : AT(__dtcm_start)
 286         {
 287                 . = ALIGN(4);
 288                 __sdtcm_data = .;
 289                 *(.tcm.data)
 290                 . = ALIGN(4);
 291                 __edtcm_data = .;
 292         }
 293
 294         /* Reset the dot pointer or the linker gets confused */
 295         . = ADDR(.dtcm_start) + SIZEOF(.data_dtcm);
 296
 297         /* End marker for freeing TCM copy in linked object */
 298         .tcm_end : AT(ADDR(.dtcm_start) + SIZEOF(.data_dtcm)){
 299                 . = ALIGN(PAGE_SIZE);
 300                 __tcm_end = .;
 301         }
 302 #endif
 303
 304         BSS_SECTION(0, 0, 0)
 305         _end = .;
 306
 307         STABS_DEBUG
 308 }
 309
 310 /*
 311  * These must never be empty
 312  * If you have to comment these two assert statements out, your
 313  * binutils is too old (for other reasons as well)
 314  */
 315 ASSERT((__proc_info_end - __proc_info_begin), "missing CPU support")
 316 ASSERT((__arch_info_end - __arch_info_begin), "no machine record defined")
 317
 318 /*
 319  * The HYP init code can't be more than a page long,
 320  * and should not cross a page boundary.
 321  * The above comment applies as well.
 322  */
 323 ASSERT(__hyp_idmap_text_end - (__hyp_idmap_text_start & PAGE_MASK) <= PAGE_SIZE,
 324         "HYP init code too big or misaligned")