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 - 2008 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 <asm/vectors.h>
  22 #include <variant/core.h>
  23 #include <platform/hardware.h>
  24 OUTPUT_ARCH(xtensa)
  25 ENTRY(_start)
  26
  27 #ifdef __XTENSA_EB__
  28 jiffies = jiffies_64 + 4;
  29 #else
  30 jiffies = jiffies_64;
  31 #endif
  32
  33 #ifndef KERNELOFFSET
  34 #define KERNELOFFSET 0xd0003000
  35 #endif
  36
  37 /* Note: In the following macros, it would be nice to specify only the
  38    vector name and section kind and construct "sym" and "section" using
  39    CPP concatenation, but that does not work reliably.  Concatenating a
  40    string with "." produces an invalid token.  CPP will not print a
  41    warning because it thinks this is an assembly file, but it leaves
  42    them as multiple tokens and there may or may not be whitespace
  43    between them.  */
  44
  45 /* Macro for a relocation entry */
  46
  47 #define RELOCATE_ENTRY(sym, section)            \
  48         LONG(sym ## _start);                    \
  49         LONG(sym ## _end);                      \
  50         LONG(LOADADDR(section))
  51
  52 /* Macro to define a section for a vector.
  53  *
  54  * Use of the MIN function catches the types of errors illustrated in
  55  * the following example:
  56  *
  57  * Assume the section .DoubleExceptionVector.literal is completely
  58  * full.  Then a programmer adds code to .DoubleExceptionVector.text
  59  * that produces another literal.  The final literal position will
  60  * overlay onto the first word of the adjacent code section
  61  * .DoubleExceptionVector.text.  (In practice, the literals will
  62  * overwrite the code, and the first few instructions will be
  63  * garbage.)
  64  */
  65
  66 #define SECTION_VECTOR(sym, section, addr, max_prevsec_size, prevsec)       \
  67   section addr : AT((MIN(LOADADDR(prevsec) + max_prevsec_size,              \
  68                          LOADADDR(prevsec) + SIZEOF(prevsec)) + 3) & ~ 3)   \
  69   {                                                                         \
  70     . = ALIGN(4);                                                           \
  71     sym ## _start = ABSOLUTE(.);                                            \
  72     *(section)                                                              \
  73     sym ## _end = ABSOLUTE(.);                                              \
  74   }
  75
  76 /*
  77  *  Mapping of input sections to output sections when linking.
  78  */
  79
  80 SECTIONS
  81 {
  82   . = KERNELOFFSET;
  83   /* .text section */
  84
  85   _text = .;
  86   _stext = .;
  87
  88   .text :
  89   {
  90     /* The HEAD_TEXT section must be the first section! */
  91     HEAD_TEXT
  92     TEXT_TEXT
  93     VMLINUX_SYMBOL(__sched_text_start) = .;
  94     *(.sched.literal .sched.text)
  95     VMLINUX_SYMBOL(__sched_text_end) = .;
  96     VMLINUX_SYMBOL(__lock_text_start) = .;
  97     *(.spinlock.literal .spinlock.text)
  98     VMLINUX_SYMBOL(__lock_text_end) = .;
  99
 100   }
 101   _etext = .;
 102   PROVIDE (etext = .);
 103
 104   . = ALIGN(16);
 105
 106   RODATA
 107
 108   /*  Relocation table */
 109
 110   .fixup   : { *(.fixup) }
 111
 112   EXCEPTION_TABLE(16)
 113   /* Data section */
 114
 115   _sdata = .;
 116   RW_DATA_SECTION(XCHAL_ICACHE_LINESIZE, PAGE_SIZE, THREAD_SIZE)
 117   _edata = .;
 118
 119   /* Initialization code and data: */
 120
 121   . = ALIGN(PAGE_SIZE);
 122   __init_begin = .;
 123   INIT_TEXT_SECTION(PAGE_SIZE)
 124
 125   .init.data :
 126   {
 127     INIT_DATA
 128     . = ALIGN(0x4);
 129     __tagtable_begin = .;
 130     *(.taglist)
 131     __tagtable_end = .;
 132
 133     . = ALIGN(16);
 134     __boot_reloc_table_start = ABSOLUTE(.);
 135
 136     RELOCATE_ENTRY(_WindowVectors_text,
 137                    .WindowVectors.text);
 138 #if XCHAL_EXCM_LEVEL >= 2
 139     RELOCATE_ENTRY(_Level2InterruptVector_text,
 140                    .Level2InterruptVector.text);
 141 #endif
 142 #if XCHAL_EXCM_LEVEL >= 3
 143     RELOCATE_ENTRY(_Level3InterruptVector_text,
 144                    .Level3InterruptVector.text);
 145 #endif
 146 #if XCHAL_EXCM_LEVEL >= 4
 147     RELOCATE_ENTRY(_Level4InterruptVector_text,
 148                    .Level4InterruptVector.text);
 149 #endif
 150 #if XCHAL_EXCM_LEVEL >= 5
 151     RELOCATE_ENTRY(_Level5InterruptVector_text,
 152                    .Level5InterruptVector.text);
 153 #endif
 154 #if XCHAL_EXCM_LEVEL >= 6
 155     RELOCATE_ENTRY(_Level6InterruptVector_text,
 156                    .Level6InterruptVector.text);
 157 #endif
 158     RELOCATE_ENTRY(_KernelExceptionVector_text,
 159                    .KernelExceptionVector.text);
 160     RELOCATE_ENTRY(_UserExceptionVector_text,
 161                    .UserExceptionVector.text);
 162     RELOCATE_ENTRY(_DoubleExceptionVector_literal,
 163                    .DoubleExceptionVector.literal);
 164     RELOCATE_ENTRY(_DoubleExceptionVector_text,
 165                    .DoubleExceptionVector.text);
 166     RELOCATE_ENTRY(_DebugInterruptVector_text,
 167                    .DebugInterruptVector.text);
 168 #if defined(CONFIG_SMP)
 169     RELOCATE_ENTRY(_SecondaryResetVector_text,
 170                    .SecondaryResetVector.text);
 171 #endif
 172
 173
 174     __boot_reloc_table_end = ABSOLUTE(.) ;
 175
 176     INIT_SETUP(XCHAL_ICACHE_LINESIZE)
 177     INIT_CALLS
 178     CON_INITCALL
 179     SECURITY_INITCALL
 180     INIT_RAM_FS
 181   }
 182
 183   PERCPU_SECTION(XCHAL_ICACHE_LINESIZE)
 184
 185   /* We need this dummy segment here */
 186
 187   . = ALIGN(4);
 188   .dummy : { LONG(0) }
 189
 190   /* The vectors are relocated to the real position at startup time */
 191
 192   SECTION_VECTOR (_WindowVectors_text,
 193                   .WindowVectors.text,
 194                   WINDOW_VECTORS_VADDR, 4,
 195                   .dummy)
 196   SECTION_VECTOR (_DebugInterruptVector_literal,
 197                   .DebugInterruptVector.literal,
 198                   DEBUG_VECTOR_VADDR - 4,
 199                   SIZEOF(.WindowVectors.text),
 200                   .WindowVectors.text)
 201   SECTION_VECTOR (_DebugInterruptVector_text,
 202                   .DebugInterruptVector.text,
 203                   DEBUG_VECTOR_VADDR,
 204                   4,
 205                   .DebugInterruptVector.literal)
 206 #undef LAST
 207 #define LAST    .DebugInterruptVector.text
 208 #if XCHAL_EXCM_LEVEL >= 2
 209   SECTION_VECTOR (_Level2InterruptVector_text,
 210                   .Level2InterruptVector.text,
 211                   INTLEVEL2_VECTOR_VADDR,
 212                   SIZEOF(LAST), LAST)
 213 # undef LAST
 214 # define LAST   .Level2InterruptVector.text
 215 #endif
 216 #if XCHAL_EXCM_LEVEL >= 3
 217   SECTION_VECTOR (_Level3InterruptVector_text,
 218                   .Level3InterruptVector.text,
 219                   INTLEVEL3_VECTOR_VADDR,
 220                   SIZEOF(LAST), LAST)
 221 # undef LAST
 222 # define LAST   .Level3InterruptVector.text
 223 #endif
 224 #if XCHAL_EXCM_LEVEL >= 4
 225   SECTION_VECTOR (_Level4InterruptVector_text,
 226                   .Level4InterruptVector.text,
 227                   INTLEVEL4_VECTOR_VADDR,
 228                   SIZEOF(LAST), LAST)
 229 # undef LAST
 230 # define LAST   .Level4InterruptVector.text
 231 #endif
 232 #if XCHAL_EXCM_LEVEL >= 5
 233   SECTION_VECTOR (_Level5InterruptVector_text,
 234                   .Level5InterruptVector.text,
 235                   INTLEVEL5_VECTOR_VADDR,
 236                   SIZEOF(LAST), LAST)
 237 # undef LAST
 238 # define LAST   .Level5InterruptVector.text
 239 #endif
 240 #if XCHAL_EXCM_LEVEL >= 6
 241   SECTION_VECTOR (_Level6InterruptVector_text,
 242                   .Level6InterruptVector.text,
 243                   INTLEVEL6_VECTOR_VADDR,
 244                   SIZEOF(LAST), LAST)
 245 # undef LAST
 246 # define LAST   .Level6InterruptVector.text
 247 #endif
 248   SECTION_VECTOR (_KernelExceptionVector_literal,
 249                   .KernelExceptionVector.literal,
 250                   KERNEL_VECTOR_VADDR - 4,
 251                   SIZEOF(LAST), LAST)
 252 #undef LAST
 253   SECTION_VECTOR (_KernelExceptionVector_text,
 254                   .KernelExceptionVector.text,
 255                   KERNEL_VECTOR_VADDR,
 256                   4,
 257                   .KernelExceptionVector.literal)
 258   SECTION_VECTOR (_UserExceptionVector_literal,
 259                   .UserExceptionVector.literal,
 260                   USER_VECTOR_VADDR - 4,
 261                   SIZEOF(.KernelExceptionVector.text),
 262                   .KernelExceptionVector.text)
 263   SECTION_VECTOR (_UserExceptionVector_text,
 264                   .UserExceptionVector.text,
 265                   USER_VECTOR_VADDR,
 266                   4,
 267                   .UserExceptionVector.literal)
 268   SECTION_VECTOR (_DoubleExceptionVector_literal,
 269                   .DoubleExceptionVector.literal,
 270                   DOUBLEEXC_VECTOR_VADDR - 48,
 271                   SIZEOF(.UserExceptionVector.text),
 272                   .UserExceptionVector.text)
 273   SECTION_VECTOR (_DoubleExceptionVector_text,
 274                   .DoubleExceptionVector.text,
 275                   DOUBLEEXC_VECTOR_VADDR,
 276                   48,
 277                   .DoubleExceptionVector.literal)
 278
 279   . = (LOADADDR( .DoubleExceptionVector.text ) + SIZEOF( .DoubleExceptionVector.text ) + 3) & ~ 3;
 280
 281 #if defined(CONFIG_SMP)
 282
 283   SECTION_VECTOR (_SecondaryResetVector_text,
 284                   .SecondaryResetVector.text,
 285                   RESET_VECTOR1_VADDR,
 286                   SIZEOF(.DoubleExceptionVector.text),
 287                   .DoubleExceptionVector.text)
 288
 289   . = LOADADDR(.SecondaryResetVector.text)+SIZEOF(.SecondaryResetVector.text);
 290
 291 #endif
 292
 293   . = ALIGN(PAGE_SIZE);
 294
 295   __init_end = .;
 296
 297   BSS_SECTION(0, 8192, 0)
 298
 299   _end = .;
 300
 301   .xt.lit : { *(.xt.lit) }
 302   .xt.prop : { *(.xt.prop) }
 303
 304   .debug  0 :  { *(.debug) }
 305   .line  0 :  { *(.line) }
 306   .debug_srcinfo  0 :  { *(.debug_srcinfo) }
 307   .debug_sfnames  0 :  { *(.debug_sfnames) }
 308   .debug_aranges  0 :  { *(.debug_aranges) }
 309   .debug_pubnames  0 :  { *(.debug_pubnames) }
 310   .debug_info  0 :  { *(.debug_info) }
 311   .debug_abbrev  0 :  { *(.debug_abbrev) }
 312   .debug_line  0 :  { *(.debug_line) }
 313   .debug_frame  0 :  { *(.debug_frame) }
 314   .debug_str  0 :  { *(.debug_str) }
 315   .debug_loc  0 :  { *(.debug_loc) }
 316   .debug_macinfo  0 :  { *(.debug_macinfo) }
 317   .debug_weaknames  0 :  { *(.debug_weaknames) }
 318   .debug_funcnames  0 :  { *(.debug_funcnames) }
 319   .debug_typenames  0 :  { *(.debug_typenames) }
 320   .debug_varnames  0 :  { *(.debug_varnames) }
 321
 322   .xt.insn 0 :
 323   {
 324     *(.xt.insn)
 325     *(.gnu.linkonce.x*)
 326   }
 327
 328   .xt.lit 0 :
 329   {
 330     *(.xt.lit)
 331     *(.gnu.linkonce.p*)
 332   }
 333
 334   /* Sections to be discarded */
 335   DISCARDS
 336   /DISCARD/ : { *(.exit.literal) }
 337 }