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