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