root/arch/xtensa/kernel/vmlinux.lds.S

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   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/core.h>
  22 #include <asm/vectors.h>
  23 
  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 /* Note: In the following macros, it would be nice to specify only the
  34    vector name and section kind and construct "sym" and "section" using
  35    CPP concatenation, but that does not work reliably.  Concatenating a
  36    string with "." produces an invalid token.  CPP will not print a
  37    warning because it thinks this is an assembly file, but it leaves
  38    them as multiple tokens and there may or may not be whitespace
  39    between them.  */
  40 
  41 /* Macro for a relocation entry */
  42 
  43 #define RELOCATE_ENTRY(sym, section)            \
  44         LONG(sym ## _start);                    \
  45         LONG(sym ## _end);                      \
  46         LONG(LOADADDR(section))
  47 
  48 /*
  49  * Macro to define a section for a vector. When CONFIG_VECTORS_OFFSET is
  50  * defined code for every vector is located with other init data. At startup
  51  * time head.S copies code for every vector to its final position according
  52  * to description recorded in the corresponding RELOCATE_ENTRY.
  53  */
  54 
  55 #ifdef CONFIG_VECTORS_OFFSET
  56 #define SECTION_VECTOR(sym, section, addr, prevsec)                         \
  57   section addr : AT(((LOADADDR(prevsec) + SIZEOF(prevsec)) + 3) & ~ 3)      \
  58   {                                                                         \
  59     . = ALIGN(4);                                                           \
  60     sym ## _start = ABSOLUTE(.);                                            \
  61     *(section)                                                              \
  62     sym ## _end = ABSOLUTE(.);                                              \
  63   }
  64 #else
  65 #define SECTION_VECTOR(section, addr)                                       \
  66   . = addr;                                                                 \
  67   *(section)
  68 #endif
  69 
  70 /*
  71  *  Mapping of input sections to output sections when linking.
  72  */
  73 
  74 SECTIONS
  75 {
  76   . = KERNELOFFSET;
  77   /* .text section */
  78 
  79   _text = .;
  80   _stext = .;
  81 
  82   .text :
  83   {
  84     /* The HEAD_TEXT section must be the first section! */
  85     HEAD_TEXT
  86 
  87 #ifndef CONFIG_VECTORS_OFFSET
  88   . = ALIGN(PAGE_SIZE);
  89   _vecbase = .;
  90 
  91   SECTION_VECTOR (.WindowVectors.text, WINDOW_VECTORS_VADDR)
  92 #if XCHAL_EXCM_LEVEL >= 2
  93   SECTION_VECTOR (.Level2InterruptVector.text, INTLEVEL2_VECTOR_VADDR)
  94 #endif
  95 #if XCHAL_EXCM_LEVEL >= 3
  96   SECTION_VECTOR (.Level3InterruptVector.text, INTLEVEL3_VECTOR_VADDR)
  97 #endif
  98 #if XCHAL_EXCM_LEVEL >= 4
  99   SECTION_VECTOR (.Level4InterruptVector.text, INTLEVEL4_VECTOR_VADDR)
 100 #endif
 101 #if XCHAL_EXCM_LEVEL >= 5
 102   SECTION_VECTOR (.Level5InterruptVector.text, INTLEVEL5_VECTOR_VADDR)
 103 #endif
 104 #if XCHAL_EXCM_LEVEL >= 6
 105   SECTION_VECTOR (.Level6InterruptVector.text, INTLEVEL6_VECTOR_VADDR)
 106 #endif
 107   SECTION_VECTOR (.DebugInterruptVector.text, DEBUG_VECTOR_VADDR)
 108   SECTION_VECTOR (.KernelExceptionVector.text, KERNEL_VECTOR_VADDR)
 109   SECTION_VECTOR (.UserExceptionVector.text, USER_VECTOR_VADDR)
 110   SECTION_VECTOR (.DoubleExceptionVector.text, DOUBLEEXC_VECTOR_VADDR)
 111 #endif
 112 
 113     IRQENTRY_TEXT
 114     SOFTIRQENTRY_TEXT
 115     ENTRY_TEXT
 116     TEXT_TEXT
 117     SCHED_TEXT
 118     CPUIDLE_TEXT
 119     LOCK_TEXT
 120 
 121   }
 122   _etext = .;
 123   PROVIDE (etext = .);
 124 
 125   . = ALIGN(16);
 126 
 127   RODATA
 128 
 129   /*  Relocation table */
 130 
 131   .fixup   : { *(.fixup) }
 132 
 133   EXCEPTION_TABLE(16)
 134   NOTES
 135   /* Data section */
 136 
 137   _sdata = .;
 138   RW_DATA_SECTION(XCHAL_ICACHE_LINESIZE, PAGE_SIZE, THREAD_SIZE)
 139   _edata = .;
 140 
 141   /* Initialization code and data: */
 142 
 143   . = ALIGN(PAGE_SIZE);
 144   __init_begin = .;
 145   INIT_TEXT_SECTION(PAGE_SIZE)
 146 
 147   .init.data :
 148   {
 149     INIT_DATA
 150     . = ALIGN(0x4);
 151     __tagtable_begin = .;
 152     *(.taglist)
 153     __tagtable_end = .;
 154 
 155     . = ALIGN(16);
 156     __boot_reloc_table_start = ABSOLUTE(.);
 157 
 158 #ifdef CONFIG_VECTORS_OFFSET
 159     RELOCATE_ENTRY(_WindowVectors_text,
 160                    .WindowVectors.text);
 161 #if XCHAL_EXCM_LEVEL >= 2
 162     RELOCATE_ENTRY(_Level2InterruptVector_text,
 163                    .Level2InterruptVector.text);
 164 #endif
 165 #if XCHAL_EXCM_LEVEL >= 3
 166     RELOCATE_ENTRY(_Level3InterruptVector_text,
 167                    .Level3InterruptVector.text);
 168 #endif
 169 #if XCHAL_EXCM_LEVEL >= 4
 170     RELOCATE_ENTRY(_Level4InterruptVector_text,
 171                    .Level4InterruptVector.text);
 172 #endif
 173 #if XCHAL_EXCM_LEVEL >= 5
 174     RELOCATE_ENTRY(_Level5InterruptVector_text,
 175                    .Level5InterruptVector.text);
 176 #endif
 177 #if XCHAL_EXCM_LEVEL >= 6
 178     RELOCATE_ENTRY(_Level6InterruptVector_text,
 179                    .Level6InterruptVector.text);
 180 #endif
 181     RELOCATE_ENTRY(_KernelExceptionVector_text,
 182                    .KernelExceptionVector.text);
 183     RELOCATE_ENTRY(_UserExceptionVector_text,
 184                    .UserExceptionVector.text);
 185     RELOCATE_ENTRY(_DoubleExceptionVector_text,
 186                    .DoubleExceptionVector.text);
 187     RELOCATE_ENTRY(_DebugInterruptVector_text,
 188                    .DebugInterruptVector.text);
 189 #endif
 190 #if defined(CONFIG_SMP)
 191     RELOCATE_ENTRY(_SecondaryResetVector_text,
 192                    .SecondaryResetVector.text);
 193 #endif
 194 
 195   
 196     __boot_reloc_table_end = ABSOLUTE(.) ;
 197 
 198     INIT_SETUP(XCHAL_ICACHE_LINESIZE)
 199     INIT_CALLS
 200     CON_INITCALL
 201     INIT_RAM_FS
 202   }
 203 
 204   PERCPU_SECTION(XCHAL_ICACHE_LINESIZE)
 205 
 206   /* We need this dummy segment here */
 207 
 208   . = ALIGN(4);
 209   .dummy : { LONG(0) }
 210 
 211 #ifdef CONFIG_VECTORS_OFFSET
 212   /* The vectors are relocated to the real position at startup time */
 213 
 214   SECTION_VECTOR (_WindowVectors_text,
 215                   .WindowVectors.text,
 216                   WINDOW_VECTORS_VADDR,
 217                   .dummy)
 218   SECTION_VECTOR (_DebugInterruptVector_text,
 219                   .DebugInterruptVector.text,
 220                   DEBUG_VECTOR_VADDR,
 221                   .WindowVectors.text)
 222 #undef LAST
 223 #define LAST    .DebugInterruptVector.text
 224 #if XCHAL_EXCM_LEVEL >= 2
 225   SECTION_VECTOR (_Level2InterruptVector_text,
 226                   .Level2InterruptVector.text,
 227                   INTLEVEL2_VECTOR_VADDR,
 228                   LAST)
 229 # undef LAST
 230 # define LAST   .Level2InterruptVector.text
 231 #endif
 232 #if XCHAL_EXCM_LEVEL >= 3
 233   SECTION_VECTOR (_Level3InterruptVector_text,
 234                   .Level3InterruptVector.text,
 235                   INTLEVEL3_VECTOR_VADDR,
 236                   LAST)
 237 # undef LAST
 238 # define LAST   .Level3InterruptVector.text
 239 #endif
 240 #if XCHAL_EXCM_LEVEL >= 4
 241   SECTION_VECTOR (_Level4InterruptVector_text,
 242                   .Level4InterruptVector.text,
 243                   INTLEVEL4_VECTOR_VADDR,
 244                   LAST)
 245 # undef LAST
 246 # define LAST   .Level4InterruptVector.text
 247 #endif
 248 #if XCHAL_EXCM_LEVEL >= 5
 249   SECTION_VECTOR (_Level5InterruptVector_text,
 250                   .Level5InterruptVector.text,
 251                   INTLEVEL5_VECTOR_VADDR,
 252                   LAST)
 253 # undef LAST
 254 # define LAST   .Level5InterruptVector.text
 255 #endif
 256 #if XCHAL_EXCM_LEVEL >= 6
 257   SECTION_VECTOR (_Level6InterruptVector_text,
 258                   .Level6InterruptVector.text,
 259                   INTLEVEL6_VECTOR_VADDR,
 260                   LAST)
 261 # undef LAST
 262 # define LAST   .Level6InterruptVector.text
 263 #endif
 264   SECTION_VECTOR (_KernelExceptionVector_text,
 265                   .KernelExceptionVector.text,
 266                   KERNEL_VECTOR_VADDR,
 267                   LAST)
 268 #undef LAST
 269   SECTION_VECTOR (_UserExceptionVector_text,
 270                   .UserExceptionVector.text,
 271                   USER_VECTOR_VADDR,
 272                   .KernelExceptionVector.text)
 273   SECTION_VECTOR (_DoubleExceptionVector_text,
 274                   .DoubleExceptionVector.text,
 275                   DOUBLEEXC_VECTOR_VADDR,
 276                   .UserExceptionVector.text)
 277 
 278   . = (LOADADDR( .DoubleExceptionVector.text ) + SIZEOF( .DoubleExceptionVector.text ) + 3) & ~ 3;
 279 
 280 #endif
 281 #if defined(CONFIG_SMP)
 282 
 283   SECTION_VECTOR (_SecondaryResetVector_text,
 284                   .SecondaryResetVector.text,
 285                   RESET_VECTOR1_VADDR,
 286                   .DoubleExceptionVector.text)
 287 
 288   . = LOADADDR(.SecondaryResetVector.text)+SIZEOF(.SecondaryResetVector.text);
 289 
 290 #endif
 291 
 292   . = ALIGN(PAGE_SIZE);
 293 
 294   __init_end = .;
 295 
 296   BSS_SECTION(0, 8192, 0)
 297 
 298   _end = .;
 299 
 300   DWARF_DEBUG
 301 
 302   .xt.prop 0 : { KEEP(*(.xt.prop .xt.prop.* .gnu.linkonce.prop.*)) }
 303   .xt.insn 0 : { KEEP(*(.xt.insn .xt.insn.* .gnu.linkonce.x*)) }
 304   .xt.lit  0 : { KEEP(*(.xt.lit  .xt.lit.*  .gnu.linkonce.p*)) }
 305 
 306   /* Sections to be discarded */
 307   DISCARDS
 308 }
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