arch/xtensa/kernel/vmlinux.lds.S

   1 /*
   2  * arch/xtensa/kernel/vmlinux.lds.S
   3  *
   4  * Xtensa linker script
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License.  See the file "COPYING" in the main directory of this archive
   8  * for more details.
   9  *
  10  * Copyright (C) 2001 - 2005 Tensilica Inc.
  11  *
  12  * Chris Zankel <chris@zankel.net>
  13  * Marc Gauthier <marc@tensilica.com, marc@alumni.uwaterloo.ca>
  14  * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
  15  */
  16
  17 #include <asm-generic/vmlinux.lds.h>
  18 #include <asm/page.h>
  19 #include <asm/thread_info.h>
  20
  21 #include <variant/core.h>
  22 #include <platform/hardware.h>
  23 OUTPUT_ARCH(xtensa)
  24 ENTRY(_start)
  25
  26 #ifdef __XTENSA_EB__
  27 jiffies = jiffies_64 + 4;
  28 #else
  29 jiffies = jiffies_64;
  30 #endif
  31
  32 #ifndef KERNELOFFSET
  33 #define KERNELOFFSET 0xd0001000
  34 #endif
  35
  36 /* Note: In the following macros, it would be nice to specify only the
  37    vector name and section kind and construct "sym" and "section" using
  38    CPP concatenation, but that does not work reliably.  Concatenating a
  39    string with "." produces an invalid token.  CPP will not print a
  40    warning because it thinks this is an assembly file, but it leaves
  41    them as multiple tokens and there may or may not be whitespace
  42    between them.  */
  43
  44 /* Macro for a relocation entry */
  45
  46 #define RELOCATE_ENTRY(sym, section)            \
  47         LONG(sym ## _start);                    \
  48         LONG(sym ## _end);                      \
  49         LONG(LOADADDR(section))
  50
  51 /* Macro to define a section for a vector.
  52  *
  53  * Use of the MIN function catches the types of errors illustrated in
  54  * the following example:
  55  *
  56  * Assume the section .DoubleExceptionVector.literal is completely
  57  * full.  Then a programmer adds code to .DoubleExceptionVector.text
  58  * that produces another literal.  The final literal position will
  59  * overlay onto the first word of the adjacent code section
  60  * .DoubleExceptionVector.text.  (In practice, the literals will
  61  * overwrite the code, and the first few instructions will be
  62  * garbage.)
  63  */
  64
  65 #define SECTION_VECTOR(sym, section, addr, max_prevsec_size, prevsec)       \
  66   section addr : AT((MIN(LOADADDR(prevsec) + max_prevsec_size,              \
  67                          LOADADDR(prevsec) + SIZEOF(prevsec)) + 3) & ~ 3)   \
  68   {                                                                         \
  69     . = ALIGN(4);                                                           \
  70     sym ## _start = ABSOLUTE(.);                                            \
  71     *(section)                                                              \
  72     sym ## _end = ABSOLUTE(.);                                              \
  73   }
  74
  75 /*
  76  *  Mapping of input sections to output sections when linking.
  77  */
  78
  79 SECTIONS
  80 {
  81   . = KERNELOFFSET;
  82   /* .text section */
  83
  84   _text = .;
  85   _stext = .;
  86
  87   .text :
  88   {
  89     /* The HEAD_TEXT section must be the first section! */
  90     HEAD_TEXT
  91     TEXT_TEXT
  92     VMLINUX_SYMBOL(__sched_text_start) = .;
  93     *(.sched.literal .sched.text)
  94     VMLINUX_SYMBOL(__sched_text_end) = .;
  95     VMLINUX_SYMBOL(__lock_text_start) = .;
  96     *(.spinlock.literal .spinlock.text)
  97     VMLINUX_SYMBOL(__lock_text_end) = .;
  98
  99   }
 100   _etext = .;
 101   PROVIDE (etext = .);
 102
 103   . = ALIGN(16);
 104
 105   RODATA
 106
 107   /*  Relocation table */
 108
 109   .fixup   : { *(.fixup) }
 110
 111   EXCEPTION_TABLE(16)
 112   /* Data section */
 113
 114   _sdata = .;
 115   RW_DATA_SECTION(XCHAL_ICACHE_LINESIZE, PAGE_SIZE, THREAD_SIZE)
 116   _edata = .;
 117
 118   /* Initialization code and data: */
 119
 120   . = ALIGN(PAGE_SIZE);
 121   __init_begin = .;
 122   INIT_TEXT_SECTION(PAGE_SIZE)
 123
 124   .init.data :
 125   {
 126     INIT_DATA
 127     . = ALIGN(0x4);
 128     __tagtable_begin = .;
 129     *(.taglist)
 130     __tagtable_end = .;
 131
 132     . = ALIGN(16);
 133     __boot_reloc_table_start = ABSOLUTE(.);
 134
 135     RELOCATE_ENTRY(_WindowVectors_text,
 136                    .WindowVectors.text);
 137     RELOCATE_ENTRY(_KernelExceptionVector_text,
 138                    .KernelExceptionVector.text);
 139     RELOCATE_ENTRY(_UserExceptionVector_text,
 140                    .UserExceptionVector.text);
 141     RELOCATE_ENTRY(_DoubleExceptionVector_literal,
 142                    .DoubleExceptionVector.literal);
 143     RELOCATE_ENTRY(_DoubleExceptionVector_text,
 144                    .DoubleExceptionVector.text);
 145     RELOCATE_ENTRY(_DebugInterruptVector_text,
 146                    .DebugInterruptVector.text);
 147
 148     __boot_reloc_table_end = ABSOLUTE(.) ;
 149
 150     INIT_SETUP(XCHAL_ICACHE_LINESIZE)
 151     INIT_CALLS
 152     CON_INITCALL
 153     SECURITY_INITCALL
 154     INIT_RAM_FS
 155   }
 156
 157   PERCPU_SECTION(XCHAL_ICACHE_LINESIZE)
 158
 159   /* We need this dummy segment here */
 160
 161   . = ALIGN(4);
 162   .dummy : { LONG(0) }
 163
 164   /* The vectors are relocated to the real position at startup time */
 165
 166   SECTION_VECTOR (_WindowVectors_text,
 167                   .WindowVectors.text,
 168                   XCHAL_WINDOW_VECTORS_VADDR, 4,
 169                   .dummy)
 170   SECTION_VECTOR (_DebugInterruptVector_literal,
 171                   .DebugInterruptVector.literal,
 172                   XCHAL_DEBUG_VECTOR_VADDR - 4,
 173                   SIZEOF(.WindowVectors.text),
 174                   .WindowVectors.text)
 175   SECTION_VECTOR (_DebugInterruptVector_text,
 176                   .DebugInterruptVector.text,
 177                   XCHAL_DEBUG_VECTOR_VADDR,
 178                   4,
 179                   .DebugInterruptVector.literal)
 180   SECTION_VECTOR (_KernelExceptionVector_literal,
 181                   .KernelExceptionVector.literal,
 182                   XCHAL_KERNEL_VECTOR_VADDR - 4,
 183                   SIZEOF(.DebugInterruptVector.text),
 184                   .DebugInterruptVector.text)
 185   SECTION_VECTOR (_KernelExceptionVector_text,
 186                   .KernelExceptionVector.text,
 187                   XCHAL_KERNEL_VECTOR_VADDR,
 188                   4,
 189                   .KernelExceptionVector.literal)
 190   SECTION_VECTOR (_UserExceptionVector_literal,
 191                   .UserExceptionVector.literal,
 192                   XCHAL_USER_VECTOR_VADDR - 4,
 193                   SIZEOF(.KernelExceptionVector.text),
 194                   .KernelExceptionVector.text)
 195   SECTION_VECTOR (_UserExceptionVector_text,
 196                   .UserExceptionVector.text,
 197                   XCHAL_USER_VECTOR_VADDR,
 198                   4,
 199                   .UserExceptionVector.literal)
 200   SECTION_VECTOR (_DoubleExceptionVector_literal,
 201                   .DoubleExceptionVector.literal,
 202                   XCHAL_DOUBLEEXC_VECTOR_VADDR - 16,
 203                   SIZEOF(.UserExceptionVector.text),
 204                   .UserExceptionVector.text)
 205   SECTION_VECTOR (_DoubleExceptionVector_text,
 206                   .DoubleExceptionVector.text,
 207                   XCHAL_DOUBLEEXC_VECTOR_VADDR,
 208                   32,
 209                   .DoubleExceptionVector.literal)
 210
 211   . = (LOADADDR( .DoubleExceptionVector.text ) + SIZEOF( .DoubleExceptionVector.text ) + 3) & ~ 3;
 212   . = ALIGN(PAGE_SIZE);
 213
 214   __init_end = .;
 215
 216   BSS_SECTION(0, 8192, 0)
 217
 218   _end = .;
 219
 220   /* only used by the boot loader  */
 221
 222   . = ALIGN(0x10);
 223   .bootstrap : { *(.bootstrap.literal .bootstrap.text .bootstrap.data) }
 224
 225   . = ALIGN(0x1000);
 226   __initrd_start = .;
 227   .initrd : { *(.initrd) }
 228   __initrd_end = .;
 229
 230   .ResetVector.text XCHAL_RESET_VECTOR_VADDR :
 231   {
 232     *(.ResetVector.text)
 233   }
 234
 235   .xt.lit : { *(.xt.lit) }
 236   .xt.prop : { *(.xt.prop) }
 237
 238   .debug  0 :  { *(.debug) }
 239   .line  0 :  { *(.line) }
 240   .debug_srcinfo  0 :  { *(.debug_srcinfo) }
 241   .debug_sfnames  0 :  { *(.debug_sfnames) }
 242   .debug_aranges  0 :  { *(.debug_aranges) }
 243   .debug_pubnames  0 :  { *(.debug_pubnames) }
 244   .debug_info  0 :  { *(.debug_info) }
 245   .debug_abbrev  0 :  { *(.debug_abbrev) }
 246   .debug_line  0 :  { *(.debug_line) }
 247   .debug_frame  0 :  { *(.debug_frame) }
 248   .debug_str  0 :  { *(.debug_str) }
 249   .debug_loc  0 :  { *(.debug_loc) }
 250   .debug_macinfo  0 :  { *(.debug_macinfo) }
 251   .debug_weaknames  0 :  { *(.debug_weaknames) }
 252   .debug_funcnames  0 :  { *(.debug_funcnames) }
 253   .debug_typenames  0 :  { *(.debug_typenames) }
 254   .debug_varnames  0 :  { *(.debug_varnames) }
 255
 256   .xt.insn 0 :
 257   {
 258     *(.xt.insn)
 259     *(.gnu.linkonce.x*)
 260   }
 261
 262   .xt.lit 0 :
 263   {
 264     *(.xt.lit)
 265     *(.gnu.linkonce.p*)
 266   }
 267
 268   /* Sections to be discarded */
 269   DISCARDS
 270   /DISCARD/ : { *(.exit.literal) }
 271 }