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 #include <asm/page.h>
  19 #include <asm/thread_info.h>
  20
  21 #include <variant/core.h>
  22 #include <platform/hardware.h>
  23 OUTPUT_ARCH(xtensa)
  24 ENTRY(_start)
  25
  26 #ifdef __XTENSA_EB__
  27 jiffies = jiffies_64 + 4;
  28 #else
  29 jiffies = jiffies_64;
  30 #endif
  31
  32 #ifndef KERNELOFFSET
  33 #define KERNELOFFSET 0xd0001000
  34 #endif
  35
  36 /* Note: In the following macros, it would be nice to specify only the
  37    vector name and section kind and construct "sym" and "section" using
  38    CPP concatenation, but that does not work reliably.  Concatenating a
  39    string with "." produces an invalid token.  CPP will not print a
  40    warning because it thinks this is an assembly file, but it leaves
  41    them as multiple tokens and there may or may not be whitespace
  42    between them.  */
  43
  44 /* Macro for a relocation entry */
  45
  46 #define RELOCATE_ENTRY(sym, section)            \
  47         LONG(sym ## _start);                    \
  48         LONG(sym ## _end);                      \
  49         LONG(LOADADDR(section))
  50
  51 /* Macro to define a section for a vector.
  52  *
  53  * Use of the MIN function catches the types of errors illustrated in
  54  * the following example:
  55  *
  56  * Assume the section .DoubleExceptionVector.literal is completely
  57  * full.  Then a programmer adds code to .DoubleExceptionVector.text
  58  * that produces another literal.  The final literal position will
  59  * overlay onto the first word of the adjacent code section
  60  * .DoubleExceptionVector.text.  (In practice, the literals will
  61  * overwrite the code, and the first few instructions will be
  62  * garbage.)
  63  */
  64
  65 #define SECTION_VECTOR(sym, section, addr, max_prevsec_size, prevsec)       \
  66   section addr : AT((MIN(LOADADDR(prevsec) + max_prevsec_size,              \
  67                          LOADADDR(prevsec) + SIZEOF(prevsec)) + 3) & ~ 3)   \
  68   {                                                                         \
  69     . = ALIGN(4);                                                           \
  70     sym ## _start = ABSOLUTE(.);                                            \
  71     *(section)                                                              \
  72     sym ## _end = ABSOLUTE(.);                                              \
  73   }
  74
  75 /*
  76  *  Mapping of input sections to output sections when linking.
  77  */
  78
  79 SECTIONS
  80 {
  81   . = KERNELOFFSET;
  82   /* .text section */
  83
  84   _text = .;
  85   _stext = .;
  86   _ftext = .;
  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   _fdata = .;
 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     RELOCATE_ENTRY(_KernelExceptionVector_text,
 139                    .KernelExceptionVector.text);
 140     RELOCATE_ENTRY(_UserExceptionVector_text,
 141                    .UserExceptionVector.text);
 142     RELOCATE_ENTRY(_DoubleExceptionVector_literal,
 143                    .DoubleExceptionVector.literal);
 144     RELOCATE_ENTRY(_DoubleExceptionVector_text,
 145                    .DoubleExceptionVector.text);
 146     RELOCATE_ENTRY(_DebugInterruptVector_text,
 147                    .DebugInterruptVector.text);
 148
 149     __boot_reloc_table_end = ABSOLUTE(.) ;
 150
 151     INIT_SETUP(XCHAL_ICACHE_LINESIZE)
 152     INIT_CALLS
 153     CON_INITCALL
 154     SECURITY_INITCALL
 155     INIT_RAM_FS
 156   }
 157
 158   PERCPU_SECTION(XCHAL_ICACHE_LINESIZE)
 159
 160   /* We need this dummy segment here */
 161
 162   . = ALIGN(4);
 163   .dummy : { LONG(0) }
 164
 165   /* The vectors are relocated to the real position at startup time */
 166
 167   SECTION_VECTOR (_WindowVectors_text,
 168                   .WindowVectors.text,
 169                   XCHAL_WINDOW_VECTORS_VADDR, 4,
 170                   .dummy)
 171   SECTION_VECTOR (_DebugInterruptVector_literal,
 172                   .DebugInterruptVector.literal,
 173                   XCHAL_DEBUG_VECTOR_VADDR - 4,
 174                   SIZEOF(.WindowVectors.text),
 175                   .WindowVectors.text)
 176   SECTION_VECTOR (_DebugInterruptVector_text,
 177                   .DebugInterruptVector.text,
 178                   XCHAL_DEBUG_VECTOR_VADDR,
 179                   4,
 180                   .DebugInterruptVector.literal)
 181   SECTION_VECTOR (_KernelExceptionVector_literal,
 182                   .KernelExceptionVector.literal,
 183                   XCHAL_KERNEL_VECTOR_VADDR - 4,
 184                   SIZEOF(.DebugInterruptVector.text),
 185                   .DebugInterruptVector.text)
 186   SECTION_VECTOR (_KernelExceptionVector_text,
 187                   .KernelExceptionVector.text,
 188                   XCHAL_KERNEL_VECTOR_VADDR,
 189                   4,
 190                   .KernelExceptionVector.literal)
 191   SECTION_VECTOR (_UserExceptionVector_literal,
 192                   .UserExceptionVector.literal,
 193                   XCHAL_USER_VECTOR_VADDR - 4,
 194                   SIZEOF(.KernelExceptionVector.text),
 195                   .KernelExceptionVector.text)
 196   SECTION_VECTOR (_UserExceptionVector_text,
 197                   .UserExceptionVector.text,
 198                   XCHAL_USER_VECTOR_VADDR,
 199                   4,
 200                   .UserExceptionVector.literal)
 201   SECTION_VECTOR (_DoubleExceptionVector_literal,
 202                   .DoubleExceptionVector.literal,
 203                   XCHAL_DOUBLEEXC_VECTOR_VADDR - 16,
 204                   SIZEOF(.UserExceptionVector.text),
 205                   .UserExceptionVector.text)
 206   SECTION_VECTOR (_DoubleExceptionVector_text,
 207                   .DoubleExceptionVector.text,
 208                   XCHAL_DOUBLEEXC_VECTOR_VADDR,
 209                   32,
 210                   .DoubleExceptionVector.literal)
 211
 212   . = (LOADADDR( .DoubleExceptionVector.text ) + SIZEOF( .DoubleExceptionVector.text ) + 3) & ~ 3;
 213   . = ALIGN(PAGE_SIZE);
 214
 215   __init_end = .;
 216
 217   BSS_SECTION(0, 8192, 0)
 218
 219   _end = .;
 220
 221   /* only used by the boot loader  */
 222
 223   . = ALIGN(0x10);
 224   .bootstrap : { *(.bootstrap.literal .bootstrap.text .bootstrap.data) }
 225
 226   . = ALIGN(0x1000);
 227   __initrd_start = .;
 228   .initrd : { *(.initrd) }
 229   __initrd_end = .;
 230
 231   .ResetVector.text XCHAL_RESET_VECTOR_VADDR :
 232   {
 233     *(.ResetVector.text)
 234   }
 235
 236   .xt.lit : { *(.xt.lit) }
 237   .xt.prop : { *(.xt.prop) }
 238
 239   .debug  0 :  { *(.debug) }
 240   .line  0 :  { *(.line) }
 241   .debug_srcinfo  0 :  { *(.debug_srcinfo) }
 242   .debug_sfnames  0 :  { *(.debug_sfnames) }
 243   .debug_aranges  0 :  { *(.debug_aranges) }
 244   .debug_pubnames  0 :  { *(.debug_pubnames) }
 245   .debug_info  0 :  { *(.debug_info) }
 246   .debug_abbrev  0 :  { *(.debug_abbrev) }
 247   .debug_line  0 :  { *(.debug_line) }
 248   .debug_frame  0 :  { *(.debug_frame) }
 249   .debug_str  0 :  { *(.debug_str) }
 250   .debug_loc  0 :  { *(.debug_loc) }
 251   .debug_macinfo  0 :  { *(.debug_macinfo) }
 252   .debug_weaknames  0 :  { *(.debug_weaknames) }
 253   .debug_funcnames  0 :  { *(.debug_funcnames) }
 254   .debug_typenames  0 :  { *(.debug_typenames) }
 255   .debug_varnames  0 :  { *(.debug_varnames) }
 256
 257   .xt.insn 0 :
 258   {
 259     *(.xt.insn)
 260     *(.gnu.linkonce.x*)
 261   }
 262
 263   .xt.lit 0 :
 264   {
 265     *(.xt.lit)
 266     *(.gnu.linkonce.p*)
 267   }
 268
 269   /* Sections to be discarded */
 270   DISCARDS
 271   /DISCARD/ : { *(.exit.literal) }
 272 }