ld/scripttempl/elfm68hc12.sc

   1 #
   2 # Unusual variables checked by this code:
   3 #       NOP - four byte opcode for no-op (defaults to 0)
   4 #       DATA_ADDR - if end-of-text-plus-one-page isn't right for data start
   5 #       OTHER_READWRITE_SECTIONS - other than .data .bss .ctors .sdata ...
   6 #               (e.g., .PARISC.global)
   7 #       OTHER_SECTIONS - at the end
   8 #       EXECUTABLE_SYMBOLS - symbols that must be defined for an
   9 #               executable (e.g., _DYNAMIC_LINK)
  10 #       TEXT_START_SYMBOLS - symbols that appear at the start of the
  11 #               .text section.
  12 #       DATA_START_SYMBOLS - symbols that appear at the start of the
  13 #               .data section.
  14 #       OTHER_BSS_SYMBOLS - symbols that appear at the start of the
  15 #               .bss section besides __bss_start.
  16 #       EMBEDDED - whether this is for an embedded system.
  17 #
  18 # When adding sections, do note that the names of some sections are used
  19 # when specifying the start address of the next.
  20 #
  21 test -z "$ENTRY" && ENTRY=_start
  22 test -z "${BIG_OUTPUT_FORMAT}" && BIG_OUTPUT_FORMAT=${OUTPUT_FORMAT}
  23 test -z "${LITTLE_OUTPUT_FORMAT}" && LITTLE_OUTPUT_FORMAT=${OUTPUT_FORMAT}
  24 if [ -z "$MACHINE" ]; then OUTPUT_ARCH=${ARCH}; else OUTPUT_ARCH=${ARCH}:${MACHINE}; fi
  25 test "$LD_FLAG" = "N" && DATA_ADDR=.
  26
  27 CTOR=".ctors ${CONSTRUCTING-0} :
  28   {
  29     ${CONSTRUCTING+ PROVIDE (__CTOR_LIST__ = .); }
  30     ${CONSTRUCTING+${CTOR_START}}
  31     *(.ctors)
  32     /* We don't want to include the .ctor section from
  33        from the crtend.o file until after the sorted ctors.
  34        The .ctor section from the crtend file contains the
  35        end of ctors marker and it must be last
  36
  37     KEEP (*(EXCLUDE_FILE (*crtend.o) .ctors))
  38     KEEP (*(SORT(.ctors.*)))
  39     KEEP (*(.ctors)) */
  40
  41     ${CONSTRUCTING+${CTOR_END}}
  42     ${CONSTRUCTING+ PROVIDE(__CTOR_END__ = .); }
  43   } ${RELOCATING+ > ${TEXT_MEMORY}}"
  44
  45 DTOR="  .dtors  ${CONSTRUCTING-0} :
  46   {
  47     ${CONSTRUCTING+ PROVIDE(__DTOR_LIST__ = .); }
  48     *(.dtors)
  49     /*
  50     KEEP (*crtbegin.o(.dtors))
  51     KEEP (*(EXCLUDE_FILE (*crtend.o) .dtors))
  52     KEEP (*(SORT(.dtors.*)))
  53     KEEP (*(.dtors)) */
  54     ${CONSTRUCTING+ PROVIDE(__DTOR_END__ = .); }
  55   } ${RELOCATING+ > ${TEXT_MEMORY}}"
  56
  57
  58 VECTORS="
  59   /* If the 'vectors_addr' symbol is defined, it indicates the start address
  60      of interrupt vectors.  This depends on the 68HC11 operating mode:
  61
  62                         Addr
  63      Single chip        0xffc0
  64      Extended mode      0xffc0
  65      Bootstrap          0x00c0
  66      Test               0xbfc0
  67
  68      In general, the vectors address is 0xffc0.  This can be overriden
  69      with the '-defsym vectors_addr=0xbfc0' ld option.
  70
  71      Note: for the bootstrap mode, the interrupt vectors are at 0xbfc0 but
  72      they are redirected to 0x00c0 by the internal PROM.  Application's vectors
  73      must also consist of jump instructions (see Motorola's manual).  */
  74
  75   PROVIDE (_vectors_addr = DEFINED (vectors_addr) ? vectors_addr : 0xffc0);
  76   .vectors DEFINED (vectors_addr) ? vectors_addr : 0xffc0 :
  77   {
  78     KEEP (*(.vectors))
  79   }"
  80
  81 #
  82 # We provide two emulations: a fixed on that defines some memory banks
  83 # and a configurable one that includes a user provided memory definition.
  84 #
  85 case $GENERIC_BOARD in
  86   yes|1|YES)
  87         MEMORY_DEF="
  88 /* Get memory banks definition from some user configuration file.
  89    This file must be located in some linker directory (search path
  90    with -L<dir>). See fixed memory banks emulation script.  */
  91 INCLUDE memory.x;
  92 "
  93         ;;
  94   *)
  95 MEMORY_DEF="
  96 /* Fixed definition of the available memory banks.
  97    See generic emulation script for a user defined configuration.  */
  98 MEMORY
  99 {
 100   page0 (rwx) : ORIGIN = 0x0, LENGTH = 256
 101   text  (rx)  : ORIGIN = ${ROM_START_ADDR}, LENGTH = ${ROM_SIZE}
 102   data        : ORIGIN = ${RAM_START_ADDR}, LENGTH = ${RAM_SIZE}
 103 }
 104
 105 /* Setup the stack on the top of the data memory bank.  */
 106 PROVIDE (_stack = ${RAM_START_ADDR} + ${RAM_SIZE} - 1);
 107 "
 108         ;;
 109 esac
 110
 111 STARTUP_CODE="
 112     /* Startup code.  */
 113     KEEP (*(.install0)) /* Section should setup the stack pointer.  */
 114     KEEP (*(.install1)) /* Place holder for applications.  */
 115     KEEP (*(.install2)) /* Optional installation of data sections in RAM.  */
 116     KEEP (*(.install3)) /* Place holder for applications.  */
 117     KEEP (*(.install4)) /* Section that calls the main.  */
 118 "
 119
 120 FINISH_CODE="
 121     /* Finish code.  */
 122     KEEP (*(.fini0))    /* Beginning of finish code (_exit symbol).  */
 123     KEEP (*(.fini1))    /* Place holder for applications.  */
 124     KEEP (*(.fini2))    /* C++ destructors.  */
 125     KEEP (*(.fini3))    /* Place holder for applications.  */
 126     KEEP (*(.fini4))    /* Runtime exit.  */
 127 "
 128
 129 PRE_COMPUTE_DATA_SIZE="
 130 /* SCz: this does not work yet... This is supposed to force the loading
 131    of _map_data.o (from libgcc.a) when the .data section is not empty.
 132    By doing so, this should bring the code that copies the .data section
 133    from ROM to RAM at init time.
 134
 135   ___pre_comp_data_size = SIZEOF(.data);
 136   __install_data_sections = ___pre_comp_data_size > 0 ?
 137                 __map_data_sections : 0;
 138 */
 139 "
 140
 141 INSTALL_RELOC="
 142   .install0 0 : { *(.install0) }
 143   .install1 0 : { *(.install1) }
 144   .install2 0 : { *(.install2) }
 145   .install3 0 : { *(.install3) }
 146   .install4 0 : { *(.install4) }
 147 "
 148
 149 FINISH_RELOC="
 150   .fini0 0 : { *(.fini0) }
 151   .fini1 0 : { *(.fini1) }
 152   .fini2 0 : { *(.fini2) }
 153   .fini3 0 : { *(.fini3) }
 154   .fini4 0 : { *(.fini4) }
 155 "
 156
 157 BSS_DATA_RELOC="
 158   .data1 0 : { *(.data1) }
 159
 160   /* We want the small data sections together, so single-instruction offsets
 161      can access them all, and initialized data all before uninitialized, so
 162      we can shorten the on-disk segment size.  */
 163   .sdata   0 : { *(.sdata) }
 164   .sbss    0 : { *(.sbss) }
 165   .scommon 0 : { *(.scommon) }
 166 "
 167
 168 SOFT_REGS_RELOC="
 169   .softregs 0 : { *(.softregs) }
 170 "
 171
 172 cat <<EOF
 173 ${RELOCATING+/* Linker script for 68HC12 executable (PROM).  */}
 174 ${RELOCATING-/* Linker script for 68HC12 object file (ld -r).  */}
 175
 176 OUTPUT_FORMAT("${OUTPUT_FORMAT}", "${BIG_OUTPUT_FORMAT}",
 177               "${LITTLE_OUTPUT_FORMAT}")
 178 OUTPUT_ARCH(${OUTPUT_ARCH})
 179 ENTRY(${ENTRY})
 180
 181 ${RELOCATING+${LIB_SEARCH_DIRS}}
 182 ${RELOCATING+${EXECUTABLE_SYMBOLS}}
 183 ${RELOCATING+${MEMORY_DEF}}
 184
 185 SECTIONS
 186 {
 187   .hash        ${RELOCATING-0} : { *(.hash)             }
 188   .dynsym      ${RELOCATING-0} : { *(.dynsym)           }
 189   .dynstr      ${RELOCATING-0} : { *(.dynstr)           }
 190   .gnu.version          ${RELOCATING-0} : { *(.gnu.version) }
 191   .gnu.version_d        ${RELOCATING-0} : { *(.gnu.version_d) }
 192   .gnu.version_r        ${RELOCATING-0} : { *(.gnu.version_r) }
 193
 194   .rel.text    ${RELOCATING-0} :
 195     {
 196       *(.rel.text)
 197       ${RELOCATING+*(.rel.text.*)}
 198       ${RELOCATING+*(.rel.gnu.linkonce.t.*)}
 199     }
 200   .rela.text   ${RELOCATING-0} :
 201     {
 202       *(.rela.text)
 203       ${RELOCATING+*(.rela.text.*)}
 204       ${RELOCATING+*(.rela.gnu.linkonce.t.*)}
 205     }
 206   .rel.data    ${RELOCATING-0} :
 207     {
 208       *(.rel.data)
 209       ${RELOCATING+*(.rel.data.*)}
 210       ${RELOCATING+*(.rel.gnu.linkonce.d.*)}
 211     }
 212   .rela.data   ${RELOCATING-0} :
 213     {
 214       *(.rela.data)
 215       ${RELOCATING+*(.rela.data.*)}
 216       ${RELOCATING+*(.rela.gnu.linkonce.d.*)}
 217     }
 218   .rel.rodata  ${RELOCATING-0} :
 219     {
 220       *(.rel.rodata)
 221       ${RELOCATING+*(.rel.rodata.*)}
 222       ${RELOCATING+*(.rel.gnu.linkonce.r.*)}
 223     }
 224   .rela.rodata ${RELOCATING-0} :
 225     {
 226       *(.rela.rodata)
 227       ${RELOCATING+*(.rela.rodata.*)}
 228       ${RELOCATING+*(.rela.gnu.linkonce.r.*)}
 229     }
 230   .rel.sdata   ${RELOCATING-0} :
 231     {
 232       *(.rel.sdata)
 233       ${RELOCATING+*(.rel.sdata.*)}
 234       ${RELOCATING+*(.rel.gnu.linkonce.s.*)}
 235     }
 236   .rela.sdata   ${RELOCATING-0} :
 237     {
 238       *(.rela.sdata)
 239       ${RELOCATING+*(.rela.sdata.*)}
 240       ${RELOCATING+*(.rela.gnu.linkonce.s.*)}
 241     }
 242   .rel.sbss    ${RELOCATING-0} :
 243     {
 244       *(.rel.sbss)
 245       ${RELOCATING+*(.rel.sbss.*)}
 246       ${RELOCATING+*(.rel.gnu.linkonce.sb.*)}
 247     }
 248   .rela.sbss   ${RELOCATING-0} :
 249     {
 250       *(.rela.sbss)
 251       ${RELOCATING+*(.rela.sbss.*)}
 252       ${RELOCATING+*(.rel.gnu.linkonce.sb.*)}
 253     }
 254   .rel.bss     ${RELOCATING-0} :
 255     {
 256       *(.rel.bss)
 257       ${RELOCATING+*(.rel.bss.*)}
 258       ${RELOCATING+*(.rel.gnu.linkonce.b.*)}
 259     }
 260   .rela.bss    ${RELOCATING-0} :
 261     {
 262       *(.rela.bss)
 263       ${RELOCATING+*(.rela.bss.*)}
 264       ${RELOCATING+*(.rela.gnu.linkonce.b.*)}
 265     }
 266   .rel.stext            ${RELOCATING-0} : { *(.rel.stest) }
 267   .rela.stext           ${RELOCATING-0} : { *(.rela.stest) }
 268   .rel.etext            ${RELOCATING-0} : { *(.rel.etest) }
 269   .rela.etext           ${RELOCATING-0} : { *(.rela.etest) }
 270   .rel.sdata            ${RELOCATING-0} : { *(.rel.sdata) }
 271   .rela.sdata           ${RELOCATING-0} : { *(.rela.sdata) }
 272   .rel.edata            ${RELOCATING-0} : { *(.rel.edata) }
 273   .rela.edata           ${RELOCATING-0} : { *(.rela.edata) }
 274   .rel.eit_v            ${RELOCATING-0} : { *(.rel.eit_v) }
 275   .rela.eit_v           ${RELOCATING-0} : { *(.rela.eit_v) }
 276   .rel.ebss             ${RELOCATING-0} : { *(.rel.ebss) }
 277   .rela.ebss            ${RELOCATING-0} : { *(.rela.ebss) }
 278   .rel.srodata          ${RELOCATING-0} : { *(.rel.srodata) }
 279   .rela.srodata         ${RELOCATING-0} : { *(.rela.srodata) }
 280   .rel.erodata          ${RELOCATING-0} : { *(.rel.erodata) }
 281   .rela.erodata         ${RELOCATING-0} : { *(.rela.erodata) }
 282   .rel.got              ${RELOCATING-0} : { *(.rel.got) }
 283   .rela.got             ${RELOCATING-0} : { *(.rela.got) }
 284   .rel.ctors            ${RELOCATING-0} : { *(.rel.ctors) }
 285   .rela.ctors           ${RELOCATING-0} : { *(.rela.ctors) }
 286   .rel.dtors            ${RELOCATING-0} : { *(.rel.dtors) }
 287   .rela.dtors           ${RELOCATING-0} : { *(.rela.dtors) }
 288   .rel.init             ${RELOCATING-0} : { *(.rel.init) }
 289   .rela.init            ${RELOCATING-0} : { *(.rela.init) }
 290   .rel.fini             ${RELOCATING-0} : { *(.rel.fini) }
 291   .rela.fini            ${RELOCATING-0} : { *(.rela.fini) }
 292   .rel.plt              ${RELOCATING-0} : { *(.rel.plt) }
 293   .rela.plt             ${RELOCATING-0} : { *(.rela.plt) }
 294
 295   /* Concatenate .page0 sections.  Put them in the page0 memory bank
 296      unless we are creating a relocatable file.  */
 297   .page0 :
 298   {
 299     *(.page0)
 300   } ${RELOCATING+ > page0}
 301
 302   /* Start of text section.  */
 303   .stext ${RELOCATING-0} :
 304   {
 305     *(.stext)
 306   } ${RELOCATING+ > ${TEXT_MEMORY}}
 307
 308   .init ${RELOCATING-0} :
 309   {
 310     *(.init)
 311   } ${RELOCATING+=${NOP-0}}
 312
 313   ${RELOCATING-${INSTALL_RELOC}}
 314   ${RELOCATING-${FINISH_RELOC}}
 315
 316   .text ${RELOCATING-0}:
 317   {
 318     /* Put startup code at beginning so that _start keeps same address.  */
 319     ${RELOCATING+${STARTUP_CODE}}
 320
 321     ${RELOCATING+*(.init)}
 322     *(.text)
 323     ${RELOCATING+*(.text.*)}
 324     /* .gnu.warning sections are handled specially by elf32.em.  */
 325     *(.gnu.warning)
 326     ${RELOCATING+*(.gnu.linkonce.t.*)}
 327
 328     ${RELOCATING+${FINISH_CODE}}
 329
 330     ${RELOCATING+_etext = .;}
 331     ${RELOCATING+PROVIDE (etext = .);}
 332
 333   } ${RELOCATING+ > ${TEXT_MEMORY}}
 334
 335   .eh_frame ${RELOCATING-0} :
 336   {
 337     KEEP (*(.eh_frame))
 338   } ${RELOCATING+ > ${TEXT_MEMORY}}
 339
 340   .rodata  ${RELOCATING-0} :
 341   {
 342     *(.rodata)
 343     ${RELOCATING+*(.rodata.*)}
 344     ${RELOCATING+*(.gnu.linkonce.r*)}
 345   } ${RELOCATING+ > ${TEXT_MEMORY}}
 346
 347   .rodata1 ${RELOCATING-0} :
 348   {
 349     *(.rodata1)
 350   } ${RELOCATING+ > ${TEXT_MEMORY}}
 351
 352   /* Constructor and destructor tables are in ROM.  */
 353   ${RELOCATING+${CTOR}}
 354   ${RELOCATING+${DTOR}}
 355
 356   .jcr ${RELOCATING-0} :
 357   {
 358     KEEP (*(.jcr))
 359   } ${RELOCATING+ > ${TEXT_MEMORY}}
 360
 361   /* Start of the data section image in ROM.  */
 362   ${RELOCATING+__data_image = .;}
 363   ${RELOCATING+PROVIDE (__data_image = .);}
 364
 365   /* All read-only sections that normally go in PROM must be above.
 366      We construct the DATA image section in PROM at end of all these
 367      read-only sections.  The data image must be copied at init time.
 368      Refer to GNU ld, Section 3.6.8.2 Output Section LMA.  */
 369   .data  ${RELOCATING-0} : ${RELOCATING+AT (__data_image)}
 370   {
 371     ${RELOCATING+__data_section_start = .;}
 372     ${RELOCATING+PROVIDE (__data_section_start = .);}
 373
 374     ${RELOCATING+${DATA_START_SYMBOLS}}
 375     ${RELOCATING+*(.sdata)}
 376     *(.data)
 377     ${RELOCATING+*(.data.*)}
 378     ${RELOCATING+*(.data1)}
 379     ${RELOCATING+*(.gnu.linkonce.d.*)}
 380     ${CONSTRUCTING+CONSTRUCTORS}
 381
 382     ${RELOCATING+_edata  =  .;}
 383     ${RELOCATING+PROVIDE (edata = .);}
 384   } ${RELOCATING+ > ${DATA_MEMORY}}
 385
 386   ${RELOCATING+__data_section_size = SIZEOF(.data);}
 387   ${RELOCATING+PROVIDE (__data_section_size = SIZEOF(.data));}
 388   ${RELOCATING+__data_image_end = __data_image + __data_section_size;}
 389
 390   ${RELOCATING+${PRE_COMPUTE_DATA_SIZE}}
 391
 392   /* .install ${RELOCATING-0}:
 393   {
 394     . = _data_image_end;
 395   } ${RELOCATING+ > ${TEXT_MEMORY}} */
 396
 397   /* Relocation for some bss and data sections.  */
 398   ${RELOCATING-${BSS_DATA_RELOC}}
 399   ${RELOCATING-${SOFT_REGS_RELOC}}
 400
 401   .bss ${RELOCATING-0} :
 402   {
 403     ${RELOCATING+__bss_start = .;}
 404     ${RELOCATING+*(.softregs)}
 405     ${RELOCATING+*(.sbss)}
 406     ${RELOCATING+*(.scommon)}
 407
 408     *(.dynbss)
 409     *(.bss)
 410     ${RELOCATING+*(.bss.*)}
 411     ${RELOCATING+*(.gnu.linkonce.b.*)}
 412     *(COMMON)
 413     ${RELOCATING+PROVIDE (_end = .);}
 414   } ${RELOCATING+ > ${DATA_MEMORY}}
 415   ${RELOCATING+__bss_size = SIZEOF(.bss);}
 416   ${RELOCATING+PROVIDE (__bss_size = SIZEOF(.bss));}
 417
 418   .eeprom ${RELOCATING-0} :
 419   {
 420     *(.eeprom)
 421     *(.eeprom.*)
 422   } ${RELOCATING+ > ${EEPROM_MEMORY}}
 423
 424   ${RELOCATING+${VECTORS}}
 425
 426   /* Stabs debugging sections.  */
 427   .stab          0 : { *(.stab) }
 428   .stabstr       0 : { *(.stabstr) }
 429   .stab.excl     0 : { *(.stab.excl) }
 430   .stab.exclstr  0 : { *(.stab.exclstr) }
 431   .stab.index    0 : { *(.stab.index) }
 432   .stab.indexstr 0 : { *(.stab.indexstr) }
 433
 434   .comment       0 : { *(.comment) }
 435
 436   /* DWARF debug sections.
 437      Symbols in the DWARF debugging sections are relative to the beginning
 438      of the section so we begin them at 0.
 439      Treatment of DWARF debug section must be at end of the linker
 440      script to avoid problems when there are undefined symbols. It's necessary
 441      to avoid that the DWARF section is relocated before such undefined
 442      symbols are found.  */
 443
 444   /* DWARF 1 */
 445   .debug         0 : { *(.debug) }
 446   .line          0 : { *(.line) }
 447
 448   /* GNU DWARF 1 extensions */
 449   .debug_srcinfo 0 : { *(.debug_srcinfo) }
 450   .debug_sfnames 0 : { *(.debug_sfnames) }
 451
 452   /* DWARF 1.1 and DWARF 2 */
 453   .debug_aranges  0 : { *(.debug_aranges) }
 454   .debug_pubnames 0 : { *(.debug_pubnames) }
 455
 456   /* DWARF 2 */
 457   .debug_info     0 : { *(.debug_info) *(.gnu.linkonce.wi.*) }
 458   .debug_abbrev   0 : { *(.debug_abbrev) }
 459   .debug_line     0 : { *(.debug_line) }
 460   .debug_frame    0 : { *(.debug_frame) }
 461   .debug_str      0 : { *(.debug_str) }
 462   .debug_loc      0 : { *(.debug_loc) }
 463   .debug_macinfo  0 : { *(.debug_macinfo) }
 464 }
 465 EOF