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_literal,
 170                    .SecondaryResetVector.literal);
 171     RELOCATE_ENTRY(_SecondaryResetVector_text,
 172                    .SecondaryResetVector.text);
 173 #endif
 174
 175
 176     __boot_reloc_table_end = ABSOLUTE(.) ;
 177
 178     INIT_SETUP(XCHAL_ICACHE_LINESIZE)
 179     INIT_CALLS
 180     CON_INITCALL
 181     SECURITY_INITCALL
 182     INIT_RAM_FS
 183   }
 184
 185   PERCPU_SECTION(XCHAL_ICACHE_LINESIZE)
 186
 187   /* We need this dummy segment here */
 188
 189   . = ALIGN(4);
 190   .dummy : { LONG(0) }
 191
 192   /* The vectors are relocated to the real position at startup time */
 193
 194   SECTION_VECTOR (_WindowVectors_text,
 195                   .WindowVectors.text,
 196                   WINDOW_VECTORS_VADDR, 4,
 197                   .dummy)
 198   SECTION_VECTOR (_DebugInterruptVector_literal,
 199                   .DebugInterruptVector.literal,
 200                   DEBUG_VECTOR_VADDR - 4,
 201                   SIZEOF(.WindowVectors.text),
 202                   .WindowVectors.text)
 203   SECTION_VECTOR (_DebugInterruptVector_text,
 204                   .DebugInterruptVector.text,
 205                   DEBUG_VECTOR_VADDR,
 206                   4,
 207                   .DebugInterruptVector.literal)
 208 #undef LAST
 209 #define LAST    .DebugInterruptVector.text
 210 #if XCHAL_EXCM_LEVEL >= 2
 211   SECTION_VECTOR (_Level2InterruptVector_text,
 212                   .Level2InterruptVector.text,
 213                   INTLEVEL2_VECTOR_VADDR,
 214                   SIZEOF(LAST), LAST)
 215 # undef LAST
 216 # define LAST   .Level2InterruptVector.text
 217 #endif
 218 #if XCHAL_EXCM_LEVEL >= 3
 219   SECTION_VECTOR (_Level3InterruptVector_text,
 220                   .Level3InterruptVector.text,
 221                   INTLEVEL3_VECTOR_VADDR,
 222                   SIZEOF(LAST), LAST)
 223 # undef LAST
 224 # define LAST   .Level3InterruptVector.text
 225 #endif
 226 #if XCHAL_EXCM_LEVEL >= 4
 227   SECTION_VECTOR (_Level4InterruptVector_text,
 228                   .Level4InterruptVector.text,
 229                   INTLEVEL4_VECTOR_VADDR,
 230                   SIZEOF(LAST), LAST)
 231 # undef LAST
 232 # define LAST   .Level4InterruptVector.text
 233 #endif
 234 #if XCHAL_EXCM_LEVEL >= 5
 235   SECTION_VECTOR (_Level5InterruptVector_text,
 236                   .Level5InterruptVector.text,
 237                   INTLEVEL5_VECTOR_VADDR,
 238                   SIZEOF(LAST), LAST)
 239 # undef LAST
 240 # define LAST   .Level5InterruptVector.text
 241 #endif
 242 #if XCHAL_EXCM_LEVEL >= 6
 243   SECTION_VECTOR (_Level6InterruptVector_text,
 244                   .Level6InterruptVector.text,
 245                   INTLEVEL6_VECTOR_VADDR,
 246                   SIZEOF(LAST), LAST)
 247 # undef LAST
 248 # define LAST   .Level6InterruptVector.text
 249 #endif
 250   SECTION_VECTOR (_KernelExceptionVector_literal,
 251                   .KernelExceptionVector.literal,
 252                   KERNEL_VECTOR_VADDR - 4,
 253                   SIZEOF(LAST), LAST)
 254 #undef LAST
 255   SECTION_VECTOR (_KernelExceptionVector_text,
 256                   .KernelExceptionVector.text,
 257                   KERNEL_VECTOR_VADDR,
 258                   4,
 259                   .KernelExceptionVector.literal)
 260   SECTION_VECTOR (_UserExceptionVector_literal,
 261                   .UserExceptionVector.literal,
 262                   USER_VECTOR_VADDR - 4,
 263                   SIZEOF(.KernelExceptionVector.text),
 264                   .KernelExceptionVector.text)
 265   SECTION_VECTOR (_UserExceptionVector_text,
 266                   .UserExceptionVector.text,
 267                   USER_VECTOR_VADDR,
 268                   4,
 269                   .UserExceptionVector.literal)
 270   SECTION_VECTOR (_DoubleExceptionVector_literal,
 271                   .DoubleExceptionVector.literal,
 272                   DOUBLEEXC_VECTOR_VADDR - 48,
 273                   SIZEOF(.UserExceptionVector.text),
 274                   .UserExceptionVector.text)
 275   SECTION_VECTOR (_DoubleExceptionVector_text,
 276                   .DoubleExceptionVector.text,
 277                   DOUBLEEXC_VECTOR_VADDR,
 278                   48,
 279                   .DoubleExceptionVector.literal)
 280
 281   . = (LOADADDR( .DoubleExceptionVector.text ) + SIZEOF( .DoubleExceptionVector.text ) + 3) & ~ 3;
 282
 283 #if defined(CONFIG_SMP)
 284
 285   SECTION_VECTOR (_SecondaryResetVector_literal,
 286                   .SecondaryResetVector.literal,
 287                   RESET_VECTOR1_VADDR - 4,
 288                   SIZEOF(.DoubleExceptionVector.text),
 289                   .DoubleExceptionVector.text)
 290
 291   SECTION_VECTOR (_SecondaryResetVector_text,
 292                   .SecondaryResetVector.text,
 293                   RESET_VECTOR1_VADDR,
 294                   4,
 295                   .SecondaryResetVector.literal)
 296
 297   . = LOADADDR(.SecondaryResetVector.text)+SIZEOF(.SecondaryResetVector.text);
 298
 299 #endif
 300
 301   . = ALIGN(PAGE_SIZE);
 302
 303   __init_end = .;
 304
 305   BSS_SECTION(0, 8192, 0)
 306
 307   _end = .;
 308
 309   /* only used by the boot loader  */
 310
 311   . = ALIGN(0x10);
 312   .bootstrap : { *(.bootstrap.literal .bootstrap.text .bootstrap.data) }
 313
 314   .ResetVector.text RESET_VECTOR_VADDR :
 315   {
 316     *(.ResetVector.text)
 317   }
 318
 319
 320   /*
 321    * This is a remapped copy of the Secondary Reset Vector Code.
 322    * It keeps gdb in sync with the PC after switching
 323    * to the temporary mapping used while setting up
 324    * the V2 MMU mappings for Linux.
 325    *
 326    * Only debug information about this section is put in the kernel image.
 327    */
 328   .SecondaryResetVector.remapped_text 0x46000000 (INFO):
 329   {
 330         *(.SecondaryResetVector.remapped_text)
 331   }
 332
 333
 334   .xt.lit : { *(.xt.lit) }
 335   .xt.prop : { *(.xt.prop) }
 336
 337   .debug  0 :  { *(.debug) }
 338   .line  0 :  { *(.line) }
 339   .debug_srcinfo  0 :  { *(.debug_srcinfo) }
 340   .debug_sfnames  0 :  { *(.debug_sfnames) }
 341   .debug_aranges  0 :  { *(.debug_aranges) }
 342   .debug_pubnames  0 :  { *(.debug_pubnames) }
 343   .debug_info  0 :  { *(.debug_info) }
 344   .debug_abbrev  0 :  { *(.debug_abbrev) }
 345   .debug_line  0 :  { *(.debug_line) }
 346   .debug_frame  0 :  { *(.debug_frame) }
 347   .debug_str  0 :  { *(.debug_str) }
 348   .debug_loc  0 :  { *(.debug_loc) }
 349   .debug_macinfo  0 :  { *(.debug_macinfo) }
 350   .debug_weaknames  0 :  { *(.debug_weaknames) }
 351   .debug_funcnames  0 :  { *(.debug_funcnames) }
 352   .debug_typenames  0 :  { *(.debug_typenames) }
 353   .debug_varnames  0 :  { *(.debug_varnames) }
 354
 355   .xt.insn 0 :
 356   {
 357     *(.xt.insn)
 358     *(.gnu.linkonce.x*)
 359   }
 360
 361   .xt.lit 0 :
 362   {
 363     *(.xt.lit)
 364     *(.gnu.linkonce.p*)
 365   }
 366
 367   /* Sections to be discarded */
 368   DISCARDS
 369   /DISCARD/ : { *(.exit.literal) }
 370 }