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
  19 #include <asm/variant/core.h>
  20 OUTPUT_ARCH(xtensa)
  21 ENTRY(_start)
  22
  23 #ifdef __XTENSA_EB__
  24 jiffies = jiffies_64 + 4;
  25 #else
  26 jiffies = jiffies_64;
  27 #endif
  28
  29 #define KERNELOFFSET 0xd0001000
  30
  31 /* Note: In the following macros, it would be nice to specify only the
  32    vector name and section kind and construct "sym" and "section" using
  33    CPP concatenation, but that does not work reliably.  Concatenating a
  34    string with "." produces an invalid token.  CPP will not print a
  35    warning because it thinks this is an assembly file, but it leaves
  36    them as multiple tokens and there may or may not be whitespace
  37    between them.  */
  38
  39 /* Macro for a relocation entry */
  40
  41 #define RELOCATE_ENTRY(sym, section)            \
  42         LONG(sym ## _start);                    \
  43         LONG(sym ## _end);                      \
  44         LONG(LOADADDR(section))
  45
  46 /* Macro to define a section for a vector.
  47  *
  48  * Use of the MIN function catches the types of errors illustrated in
  49  * the following example:
  50  *
  51  * Assume the section .DoubleExceptionVector.literal is completely
  52  * full.  Then a programmer adds code to .DoubleExceptionVector.text
  53  * that produces another literal.  The final literal position will
  54  * overlay onto the first word of the adjacent code section
  55  * .DoubleExceptionVector.text.  (In practice, the literals will
  56  * overwrite the code, and the first few instructions will be
  57  * garbage.)
  58  */
  59
  60 #define SECTION_VECTOR(sym, section, addr, max_prevsec_size, prevsec)       \
  61   section addr : AT((MIN(LOADADDR(prevsec) + max_prevsec_size,              \
  62                          LOADADDR(prevsec) + SIZEOF(prevsec)) + 3) & ~ 3)   \
  63   {                                                                         \
  64     . = ALIGN(4);                                                           \
  65     sym ## _start = ABSOLUTE(.);                                            \
  66     *(section)                                                              \
  67     sym ## _end = ABSOLUTE(.);                                              \
  68   }
  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   _ftext = .;
  82
  83   .text :
  84   {
  85     /* The .head.text section must be the first section! */
  86     *(.head.text)
  87     *(.literal .text)
  88     VMLINUX_SYMBOL(__sched_text_start) = .;
  89     *(.sched.literal .sched.text)
  90     VMLINUX_SYMBOL(__sched_text_end) = .;
  91     VMLINUX_SYMBOL(__lock_text_start) = .;
  92     *(.spinlock.literal .spinlock.text)
  93     VMLINUX_SYMBOL(__lock_text_end) = .;
  94
  95   }
  96   _etext = .;
  97   PROVIDE (etext = .);
  98
  99   . = ALIGN(16);
 100
 101   RODATA
 102
 103   /*  Relocation table */
 104
 105   .fixup   : { *(.fixup) }
 106
 107   . = ALIGN(16);
 108
 109   __ex_table : {
 110     __start___ex_table = .;
 111     *(__ex_table)
 112     __stop___ex_table = .;
 113   }
 114
 115   /* Data section */
 116
 117   . = ALIGN(XCHAL_ICACHE_LINESIZE);
 118   _fdata = .;
 119   .data :
 120   {
 121     DATA_DATA
 122     CONSTRUCTORS
 123     . = ALIGN(XCHAL_ICACHE_LINESIZE);
 124     *(.data.cacheline_aligned)
 125   }
 126
 127   _edata = .;
 128
 129   /* The initial task */
 130   . = ALIGN(8192);
 131   .data.init_task : { *(.data.init_task) }
 132
 133   /* Initialization code and data: */
 134
 135   . = ALIGN(1 << 12);
 136   __init_begin = .;
 137   .init.text : {
 138         _sinittext = .;
 139         *(.init.literal) *(.cpuinit.literal)
 140         *(.devinit.literal) *(.meminit.literal)
 141         INIT_TEXT
 142         _einittext = .;
 143   }
 144
 145   .init.data :
 146   {
 147     INIT_DATA
 148     . = ALIGN(0x4);
 149     __tagtable_begin = .;
 150     *(.taglist)
 151     __tagtable_end = .;
 152
 153     . = ALIGN(16);
 154     __boot_reloc_table_start = ABSOLUTE(.);
 155
 156     RELOCATE_ENTRY(_WindowVectors_text,
 157                    .WindowVectors.text);
 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
 169     __boot_reloc_table_end = ABSOLUTE(.) ;
 170   }
 171
 172   . = ALIGN(XCHAL_ICACHE_LINESIZE);
 173
 174   __setup_start = .;
 175   .init.setup : { *(.init.setup) }
 176   __setup_end = .;
 177
 178   __initcall_start = .;
 179   .initcall.init : {
 180         INITCALLS
 181   }
 182   __initcall_end = .;
 183
 184   __con_initcall_start = .;
 185   .con_initcall.init : { *(.con_initcall.init) }
 186   __con_initcall_end = .;
 187
 188   SECURITY_INIT
 189
 190
 191 #ifdef CONFIG_BLK_DEV_INITRD
 192   . = ALIGN(4096);
 193   __initramfs_start =.;
 194   .init.ramfs : { *(.init.ramfs) }
 195   __initramfs_end = .;
 196 #endif
 197
 198   PERCPU(4096)
 199
 200
 201   /* We need this dummy segment here */
 202
 203   . = ALIGN(4);
 204   .dummy : { LONG(0) }
 205
 206   /* The vectors are relocated to the real position at startup time */
 207
 208   SECTION_VECTOR (_WindowVectors_text,
 209                   .WindowVectors.text,
 210                   XCHAL_WINDOW_VECTORS_VADDR, 4,
 211                   .dummy)
 212   SECTION_VECTOR (_DebugInterruptVector_literal,
 213                   .DebugInterruptVector.literal,
 214                   XCHAL_DEBUG_VECTOR_VADDR - 4,
 215                   SIZEOF(.WindowVectors.text),
 216                   .WindowVectors.text)
 217   SECTION_VECTOR (_DebugInterruptVector_text,
 218                   .DebugInterruptVector.text,
 219                   XCHAL_DEBUG_VECTOR_VADDR,
 220                   4,
 221                   .DebugInterruptVector.literal)
 222   SECTION_VECTOR (_KernelExceptionVector_literal,
 223                   .KernelExceptionVector.literal,
 224                   XCHAL_KERNEL_VECTOR_VADDR - 4,
 225                   SIZEOF(.DebugInterruptVector.text),
 226                   .DebugInterruptVector.text)
 227   SECTION_VECTOR (_KernelExceptionVector_text,
 228                   .KernelExceptionVector.text,
 229                   XCHAL_KERNEL_VECTOR_VADDR,
 230                   4,
 231                   .KernelExceptionVector.literal)
 232   SECTION_VECTOR (_UserExceptionVector_literal,
 233                   .UserExceptionVector.literal,
 234                   XCHAL_USER_VECTOR_VADDR - 4,
 235                   SIZEOF(.KernelExceptionVector.text),
 236                   .KernelExceptionVector.text)
 237   SECTION_VECTOR (_UserExceptionVector_text,
 238                   .UserExceptionVector.text,
 239                   XCHAL_USER_VECTOR_VADDR,
 240                   4,
 241                   .UserExceptionVector.literal)
 242   SECTION_VECTOR (_DoubleExceptionVector_literal,
 243                   .DoubleExceptionVector.literal,
 244                   XCHAL_DOUBLEEXC_VECTOR_VADDR - 16,
 245                   SIZEOF(.UserExceptionVector.text),
 246                   .UserExceptionVector.text)
 247   SECTION_VECTOR (_DoubleExceptionVector_text,
 248                   .DoubleExceptionVector.text,
 249                   XCHAL_DOUBLEEXC_VECTOR_VADDR,
 250                   32,
 251                   .DoubleExceptionVector.literal)
 252
 253   . = (LOADADDR( .DoubleExceptionVector.text ) + SIZEOF( .DoubleExceptionVector.text ) + 3) & ~ 3;
 254   . = ALIGN(1 << 12);
 255
 256   __init_end = .;
 257
 258   . = ALIGN(8192);
 259
 260   /* BSS section */
 261   _bss_start = .;
 262   .bss : { *(.bss.page_aligned) *(.bss) }
 263   _bss_end = .;
 264
 265   _end = .;
 266
 267   /* only used by the boot loader  */
 268
 269   . = ALIGN(0x10);
 270   .bootstrap : { *(.bootstrap.literal .bootstrap.text .bootstrap.data) }
 271
 272   . = ALIGN(0x1000);
 273   __initrd_start = .;
 274   .initrd : { *(.initrd) }
 275   __initrd_end = .;
 276
 277   .ResetVector.text XCHAL_RESET_VECTOR_VADDR :
 278   {
 279     *(.ResetVector.text)
 280   }
 281
 282   /* Sections to be discarded */
 283   /DISCARD/ :
 284   {
 285         *(.exit.literal)
 286         EXIT_TEXT
 287         EXIT_DATA
 288         *(.exitcall.exit)
 289   }
 290
 291   .xt.lit : { *(.xt.lit) }
 292   .xt.prop : { *(.xt.prop) }
 293
 294   .debug  0 :  { *(.debug) }
 295   .line  0 :  { *(.line) }
 296   .debug_srcinfo  0 :  { *(.debug_srcinfo) }
 297   .debug_sfnames  0 :  { *(.debug_sfnames) }
 298   .debug_aranges  0 :  { *(.debug_aranges) }
 299   .debug_pubnames  0 :  { *(.debug_pubnames) }
 300   .debug_info  0 :  { *(.debug_info) }
 301   .debug_abbrev  0 :  { *(.debug_abbrev) }
 302   .debug_line  0 :  { *(.debug_line) }
 303   .debug_frame  0 :  { *(.debug_frame) }
 304   .debug_str  0 :  { *(.debug_str) }
 305   .debug_loc  0 :  { *(.debug_loc) }
 306   .debug_macinfo  0 :  { *(.debug_macinfo) }
 307   .debug_weaknames  0 :  { *(.debug_weaknames) }
 308   .debug_funcnames  0 :  { *(.debug_funcnames) }
 309   .debug_typenames  0 :  { *(.debug_typenames) }
 310   .debug_varnames  0 :  { *(.debug_varnames) }
 311
 312   .xt.insn 0 :
 313   {
 314     *(.xt.insn)
 315     *(.gnu.linkonce.x*)
 316   }
 317
 318   .xt.lit 0 :
 319   {
 320     *(.xt.lit)
 321     *(.gnu.linkonce.p*)
 322   }
 323 }