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/thread_info.h>
   8 #include <asm/memory.h>
   9 #include <asm/page.h>
  10
  11 #define PROC_INFO                                                       \
  12         VMLINUX_SYMBOL(__proc_info_begin) = .;                          \
  13         *(.proc.info.init)                                              \
  14         VMLINUX_SYMBOL(__proc_info_end) = .;
  15
  16 #ifdef CONFIG_HOTPLUG_CPU
  17 #define ARM_CPU_DISCARD(x)
  18 #define ARM_CPU_KEEP(x)         x
  19 #else
  20 #define ARM_CPU_DISCARD(x)      x
  21 #define ARM_CPU_KEEP(x)
  22 #endif
  23
  24 #if defined(CONFIG_SMP_ON_UP) && !defined(CONFIG_DEBUG_SPINLOCK)
  25 #define ARM_EXIT_KEEP(x)        x
  26 #else
  27 #define ARM_EXIT_KEEP(x)
  28 #endif
  29
  30 OUTPUT_ARCH(arm)
  31 ENTRY(stext)
  32
  33 #ifndef __ARMEB__
  34 jiffies = jiffies_64;
  35 #else
  36 jiffies = jiffies_64 + 4;
  37 #endif
  38
  39 SECTIONS
  40 {
  41 #ifdef CONFIG_XIP_KERNEL
  42         . = XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR);
  43 #else
  44         . = PAGE_OFFSET + TEXT_OFFSET;
  45 #endif
  46
  47         .init : {                       /* Init code and data           */
  48                 _stext = .;
  49                 _sinittext = .;
  50                         HEAD_TEXT
  51                         INIT_TEXT
  52                         ARM_EXIT_KEEP(EXIT_TEXT)
  53                 _einittext = .;
  54                 ARM_CPU_DISCARD(PROC_INFO)
  55                 __arch_info_begin = .;
  56                         *(.arch.info.init)
  57                 __arch_info_end = .;
  58                 __tagtable_begin = .;
  59                         *(.taglist.init)
  60                 __tagtable_end = .;
  61 #ifdef CONFIG_SMP_ON_UP
  62                 __smpalt_begin = .;
  63                         *(.alt.smp.init)
  64                 __smpalt_end = .;
  65 #endif
  66
  67                 INIT_SETUP(16)
  68
  69                 INIT_CALLS
  70                 CON_INITCALL
  71                 SECURITY_INITCALL
  72                 INIT_RAM_FS
  73
  74 #ifndef CONFIG_XIP_KERNEL
  75                 __init_begin = _stext;
  76                 INIT_DATA
  77                 ARM_EXIT_KEEP(EXIT_DATA)
  78 #endif
  79         }
  80
  81         PERCPU(PAGE_SIZE)
  82
  83 #ifndef CONFIG_XIP_KERNEL
  84         . = ALIGN(PAGE_SIZE);
  85         __init_end = .;
  86 #endif
  87
  88         /*
  89          * unwind exit sections must be discarded before the rest of the
  90          * unwind sections get included.
  91          */
  92         /DISCARD/ : {
  93                 *(.ARM.exidx.exit.text)
  94                 *(.ARM.extab.exit.text)
  95                 ARM_CPU_DISCARD(*(.ARM.exidx.cpuexit.text))
  96                 ARM_CPU_DISCARD(*(.ARM.extab.cpuexit.text))
  97 #ifndef CONFIG_HOTPLUG
  98                 *(.ARM.exidx.devexit.text)
  99                 *(.ARM.extab.devexit.text)
 100 #endif
 101 #ifndef CONFIG_MMU
 102                 *(.fixup)
 103                 *(__ex_table)
 104 #endif
 105         }
 106
 107         .text : {                       /* Real text segment            */
 108                 _text = .;              /* Text and read-only data      */
 109                         __exception_text_start = .;
 110                         *(.exception.text)
 111                         __exception_text_end = .;
 112                         IRQENTRY_TEXT
 113                         TEXT_TEXT
 114                         SCHED_TEXT
 115                         LOCK_TEXT
 116                         KPROBES_TEXT
 117 #ifdef CONFIG_MMU
 118                         *(.fixup)
 119 #endif
 120                         *(.gnu.warning)
 121                         *(.rodata)
 122                         *(.rodata.*)
 123                         *(.glue_7)
 124                         *(.glue_7t)
 125                 . = ALIGN(4);
 126                 *(.got)                 /* Global offset table          */
 127                         ARM_CPU_KEEP(PROC_INFO)
 128         }
 129
 130         RO_DATA(PAGE_SIZE)
 131
 132 #ifdef CONFIG_ARM_UNWIND
 133         /*
 134          * Stack unwinding tables
 135          */
 136         . = ALIGN(8);
 137         .ARM.unwind_idx : {
 138                 __start_unwind_idx = .;
 139                 *(.ARM.exidx*)
 140                 __stop_unwind_idx = .;
 141         }
 142         .ARM.unwind_tab : {
 143                 __start_unwind_tab = .;
 144                 *(.ARM.extab*)
 145                 __stop_unwind_tab = .;
 146         }
 147 #endif
 148
 149         _etext = .;                     /* End of text and rodata section */
 150
 151 #ifdef CONFIG_XIP_KERNEL
 152         __data_loc = ALIGN(4);          /* location in binary */
 153         . = PAGE_OFFSET + TEXT_OFFSET;
 154 #else
 155         . = ALIGN(THREAD_SIZE);
 156         __data_loc = .;
 157 #endif
 158
 159         .data : AT(__data_loc) {
 160                 _data = .;              /* address in memory */
 161                 _sdata = .;
 162
 163                 /*
 164                  * first, the init task union, aligned
 165                  * to an 8192 byte boundary.
 166                  */
 167                 INIT_TASK_DATA(THREAD_SIZE)
 168
 169 #ifdef CONFIG_XIP_KERNEL
 170                 . = ALIGN(PAGE_SIZE);
 171                 __init_begin = .;
 172                 INIT_DATA
 173                 ARM_EXIT_KEEP(EXIT_DATA)
 174                 . = ALIGN(PAGE_SIZE);
 175                 __init_end = .;
 176 #endif
 177
 178                 NOSAVE_DATA
 179                 CACHELINE_ALIGNED_DATA(32)
 180                 READ_MOSTLY_DATA(32)
 181
 182                 /*
 183                  * The exception fixup table (might need resorting at runtime)
 184                  */
 185                 . = ALIGN(32);
 186                 __start___ex_table = .;
 187 #ifdef CONFIG_MMU
 188                 *(__ex_table)
 189 #endif
 190                 __stop___ex_table = .;
 191
 192                 /*
 193                  * and the usual data section
 194                  */
 195                 DATA_DATA
 196                 CONSTRUCTORS
 197
 198                 _edata = .;
 199         }
 200         _edata_loc = __data_loc + SIZEOF(.data);
 201
 202 #ifdef CONFIG_HAVE_TCM
 203         /*
 204          * We align everything to a page boundary so we can
 205          * free it after init has commenced and TCM contents have
 206          * been copied to its destination.
 207          */
 208         .tcm_start : {
 209                 . = ALIGN(PAGE_SIZE);
 210                 __tcm_start = .;
 211                 __itcm_start = .;
 212         }
 213
 214         /*
 215          * Link these to the ITCM RAM
 216          * Put VMA to the TCM address and LMA to the common RAM
 217          * and we'll upload the contents from RAM to TCM and free
 218          * the used RAM after that.
 219          */
 220         .text_itcm ITCM_OFFSET : AT(__itcm_start)
 221         {
 222                 __sitcm_text = .;
 223                 *(.tcm.text)
 224                 *(.tcm.rodata)
 225                 . = ALIGN(4);
 226                 __eitcm_text = .;
 227         }
 228
 229         /*
 230          * Reset the dot pointer, this is needed to create the
 231          * relative __dtcm_start below (to be used as extern in code).
 232          */
 233         . = ADDR(.tcm_start) + SIZEOF(.tcm_start) + SIZEOF(.text_itcm);
 234
 235         .dtcm_start : {
 236                 __dtcm_start = .;
 237         }
 238
 239         /* TODO: add remainder of ITCM as well, that can be used for data! */
 240         .data_dtcm DTCM_OFFSET : AT(__dtcm_start)
 241         {
 242                 . = ALIGN(4);
 243                 __sdtcm_data = .;
 244                 *(.tcm.data)
 245                 . = ALIGN(4);
 246                 __edtcm_data = .;
 247         }
 248
 249         /* Reset the dot pointer or the linker gets confused */
 250         . = ADDR(.dtcm_start) + SIZEOF(.data_dtcm);
 251
 252         /* End marker for freeing TCM copy in linked object */
 253         .tcm_end : AT(ADDR(.dtcm_start) + SIZEOF(.data_dtcm)){
 254                 . = ALIGN(PAGE_SIZE);
 255                 __tcm_end = .;
 256         }
 257 #endif
 258
 259         NOTES
 260
 261         BSS_SECTION(0, 0, 0)
 262         _end = .;
 263
 264         STABS_DEBUG
 265         .comment 0 : { *(.comment) }
 266
 267         /* Default discards */
 268         DISCARDS
 269
 270 #ifndef CONFIG_SMP_ON_UP
 271         /DISCARD/ : {
 272                 *(.alt.smp.init)
 273         }
 274 #endif
 275 }
 276
 277 /*
 278  * These must never be empty
 279  * If you have to comment these two assert statements out, your
 280  * binutils is too old (for other reasons as well)
 281  */
 282 ASSERT((__proc_info_end - __proc_info_begin), "missing CPU support")
 283 ASSERT((__arch_info_end - __arch_info_begin), "no machine record defined")