ld/scripttempl/elfm68hc12.sc

   1 # Copyright (C) 2014-2021 Free Software Foundation, Inc.
   2 #
   3 # Copying and distribution of this file, with or without modification,
   4 # are permitted in any medium without royalty provided the copyright
   5 # notice and this notice are preserved.
   6 #
   7 # Unusual variables checked by this code:
   8 #       NOP - four byte opcode for no-op (defaults to 0)
   9 #       DATA_ADDR - if end-of-text-plus-one-page isn't right for data start
  10 #       OTHER_READWRITE_SECTIONS - other than .data .bss .ctors .sdata ...
  11 #               (e.g., .PARISC.global)
  12 #       OTHER_SECTIONS - at the end
  13 #       EXECUTABLE_SYMBOLS - symbols that must be defined for an
  14 #               executable (e.g., _DYNAMIC_LINK)
  15 #       TEXT_START_SYMBOLS - symbols that appear at the start of the
  16 #               .text section.
  17 #       DATA_START_SYMBOLS - symbols that appear at the start of the
  18 #               .data section.
  19 #       OTHER_BSS_SYMBOLS - symbols that appear at the start of the
  20 #               .bss section besides __bss_start.
  21 #       EMBEDDED - whether this is for an embedded system.
  22 #
  23 # When adding sections, do note that the names of some sections are used
  24 # when specifying the start address of the next.
  25 #
  26 test -z "$ENTRY" && ENTRY=_start
  27 test -z "${BIG_OUTPUT_FORMAT}" && BIG_OUTPUT_FORMAT=${OUTPUT_FORMAT}
  28 test -z "${LITTLE_OUTPUT_FORMAT}" && LITTLE_OUTPUT_FORMAT=${OUTPUT_FORMAT}
  29 if [ -z "$MACHINE" ]; then OUTPUT_ARCH=${ARCH}; else OUTPUT_ARCH=${ARCH}:${MACHINE}; fi
  30 test "$LD_FLAG" = "N" && DATA_ADDR=.
  31
  32 CTOR=".ctors ${CONSTRUCTING-0} :
  33   {
  34     ${CONSTRUCTING+ PROVIDE (__CTOR_LIST__ = .); }
  35     ${CONSTRUCTING+${CTOR_START}}
  36     KEEP (*(.ctors))
  37
  38     ${CONSTRUCTING+${CTOR_END}}
  39     ${CONSTRUCTING+ PROVIDE(__CTOR_END__ = .); }
  40   } ${RELOCATING+ > ${TEXT_MEMORY}}"
  41
  42 DTOR="  .dtors  ${CONSTRUCTING-0} :
  43   {
  44     ${CONSTRUCTING+ PROVIDE(__DTOR_LIST__ = .); }
  45     KEEP (*(.dtors))
  46     ${CONSTRUCTING+ PROVIDE(__DTOR_END__ = .); }
  47   } ${RELOCATING+ > ${TEXT_MEMORY}}"
  48
  49
  50 VECTORS="
  51   /* If the 'vectors_addr' symbol is defined, it indicates the start address
  52      of interrupt vectors.  This depends on the 68HC11 operating mode:
  53
  54                         Addr
  55      Single chip        0xffc0
  56      Extended mode      0xffc0
  57      Bootstrap          0x00c0
  58      Test               0xbfc0
  59
  60      In general, the vectors address is 0xffc0.  This can be overriden
  61      with the '-defsym vectors_addr=0xbfc0' ld option.
  62
  63      Note: for the bootstrap mode, the interrupt vectors are at 0xbfc0 but
  64      they are redirected to 0x00c0 by the internal PROM.  Application's vectors
  65      must also consist of jump instructions (see Motorola's manual).  */
  66
  67   PROVIDE (_vectors_addr = DEFINED (vectors_addr) ? vectors_addr : 0xffc0);
  68   .vectors DEFINED (vectors_addr) ? vectors_addr : 0xffc0 :
  69   {
  70     KEEP (*(.vectors))
  71   }"
  72
  73 #
  74 # We provide two emulations: a fixed on that defines some memory banks
  75 # and a configurable one that includes a user provided memory definition.
  76 #
  77 case $GENERIC_BOARD in
  78   yes|1|YES)
  79         MEMORY_DEF="
  80 /* Get memory banks definition from some user configuration file.
  81    This file must be located in some linker directory (search path
  82    with -L<dir>). See fixed memory banks emulation script.  */
  83 INCLUDE memory.x;
  84 "
  85         ;;
  86   *)
  87 MEMORY_DEF="
  88 /* Fixed definition of the available memory banks.
  89    See generic emulation script for a user defined configuration.  */
  90 MEMORY
  91 {
  92   page0 (rwx) : ORIGIN = 0x0, LENGTH = 256
  93   text  (rx)  : ORIGIN = ${ROM_START_ADDR}, LENGTH = ${ROM_SIZE}
  94   data        : ORIGIN = ${RAM_START_ADDR}, LENGTH = ${RAM_SIZE}
  95   eeprom      : ORIGIN = ${EEPROM_START_ADDR}, LENGTH = ${EEPROM_SIZE}
  96 }
  97
  98 /* Setup the stack on the top of the data memory bank.  */
  99 PROVIDE (_stack = ${RAM_START_ADDR} + ${RAM_SIZE} - 1);
 100 "
 101         ;;
 102 esac
 103
 104 STARTUP_CODE="
 105     /* Startup code.  */
 106     KEEP (*(.install0)) /* Section should setup the stack pointer.  */
 107     KEEP (*(.install1)) /* Place holder for applications.  */
 108     KEEP (*(.install2)) /* Optional installation of data sections in RAM.  */
 109     KEEP (*(.install3)) /* Place holder for applications.  */
 110     KEEP (*(.install4)) /* Section that calls the main.  */
 111 "
 112
 113 FINISH_CODE="
 114     /* Finish code.  */
 115     KEEP (*(.fini0))    /* Beginning of finish code (_exit symbol).  */
 116     KEEP (*(.fini1))    /* Place holder for applications.  */
 117     KEEP (*(.fini2))    /* C++ destructors.  */
 118     KEEP (*(.fini3))    /* Place holder for applications.  */
 119     KEEP (*(.fini4))    /* Runtime exit.  */
 120 "
 121
 122 PRE_COMPUTE_DATA_SIZE="
 123 /* SCz: this does not work yet... This is supposed to force the loading
 124    of _map_data.o (from libgcc.a) when the .data section is not empty.
 125    By doing so, this should bring the code that copies the .data section
 126    from ROM to RAM at init time.
 127
 128   ___pre_comp_data_size = SIZEOF(.data);
 129   __install_data_sections = ___pre_comp_data_size > 0 ?
 130                 __map_data_sections : 0;
 131 */
 132 "
 133
 134 INSTALL_RELOC="
 135   .install0 0 : { *(.install0) }
 136   .install1 0 : { *(.install1) }
 137   .install2 0 : { *(.install2) }
 138   .install3 0 : { *(.install3) }
 139   .install4 0 : { *(.install4) }
 140 "
 141
 142 FINISH_RELOC="
 143   .fini0 0 : { *(.fini0) }
 144   .fini1 0 : { *(.fini1) }
 145   .fini2 0 : { *(.fini2) }
 146   .fini3 0 : { *(.fini3) }
 147   .fini4 0 : { *(.fini4) }
 148 "
 149
 150 BSS_DATA_RELOC="
 151   .data1 0 : { *(.data1) }
 152
 153   /* We want the small data sections together, so single-instruction offsets
 154      can access them all, and initialized data all before uninitialized, so
 155      we can shorten the on-disk segment size.  */
 156   .sdata   0 : { *(.sdata) }
 157   .sbss    0 : { *(.sbss) }
 158   .scommon 0 : { *(.scommon) }
 159 "
 160
 161 SOFT_REGS_RELOC="
 162   .softregs 0 : { *(.softregs) }
 163 "
 164
 165 cat <<EOF
 166 /* Copyright (C) 2014-2021 Free Software Foundation, Inc.
 167
 168    Copying and distribution of this script, with or without modification,
 169    are permitted in any medium without royalty provided the copyright
 170    notice and this notice are preserved.  */
 171
 172 ${RELOCATING+/* Linker script for 68HC12 executable (PROM).  */}
 173 ${RELOCATING-/* Linker script for 68HC12 object file (ld -r).  */}
 174
 175 OUTPUT_FORMAT("${OUTPUT_FORMAT}", "${BIG_OUTPUT_FORMAT}",
 176               "${LITTLE_OUTPUT_FORMAT}")
 177 OUTPUT_ARCH(${OUTPUT_ARCH})
 178 ${RELOCATING+ENTRY(${ENTRY})}
 179
 180 ${RELOCATING+${LIB_SEARCH_DIRS}}
 181 ${RELOCATING+${EXECUTABLE_SYMBOLS}}
 182 ${RELOCATING+${MEMORY_DEF}}
 183
 184 SECTIONS
 185 {
 186   .hash        ${RELOCATING-0} : { *(.hash)             }
 187   .dynsym      ${RELOCATING-0} : { *(.dynsym)           }
 188   .dynstr      ${RELOCATING-0} : { *(.dynstr)           }
 189   .gnu.version          ${RELOCATING-0} : { *(.gnu.version) }
 190   .gnu.version_d        ${RELOCATING-0} : { *(.gnu.version_d) }
 191   .gnu.version_r        ${RELOCATING-0} : { *(.gnu.version_r) }
 192
 193   .rel.text    ${RELOCATING-0} :
 194     {
 195       *(.rel.text)
 196       ${RELOCATING+*(.rel.text.*)}
 197       ${RELOCATING+*(.rel.gnu.linkonce.t.*)}
 198     }
 199   .rela.text   ${RELOCATING-0} :
 200     {
 201       *(.rela.text)
 202       ${RELOCATING+*(.rela.text.*)}
 203       ${RELOCATING+*(.rela.gnu.linkonce.t.*)}
 204     }
 205   .rel.data    ${RELOCATING-0} :
 206     {
 207       *(.rel.data)
 208       ${RELOCATING+*(.rel.data.*)}
 209       ${RELOCATING+*(.rel.gnu.linkonce.d.*)}
 210     }
 211   .rela.data   ${RELOCATING-0} :
 212     {
 213       *(.rela.data)
 214       ${RELOCATING+*(.rela.data.*)}
 215       ${RELOCATING+*(.rela.gnu.linkonce.d.*)}
 216     }
 217   .rel.rodata  ${RELOCATING-0} :
 218     {
 219       *(.rel.rodata)
 220       ${RELOCATING+*(.rel.rodata.*)}
 221       ${RELOCATING+*(.rel.gnu.linkonce.r.*)}
 222     }
 223   .rela.rodata ${RELOCATING-0} :
 224     {
 225       *(.rela.rodata)
 226       ${RELOCATING+*(.rela.rodata.*)}
 227       ${RELOCATING+*(.rela.gnu.linkonce.r.*)}
 228     }
 229   .rel.sdata   ${RELOCATING-0} :
 230     {
 231       *(.rel.sdata)
 232       ${RELOCATING+*(.rel.sdata.*)}
 233       ${RELOCATING+*(.rel.gnu.linkonce.s.*)}
 234     }
 235   .rela.sdata   ${RELOCATING-0} :
 236     {
 237       *(.rela.sdata)
 238       ${RELOCATING+*(.rela.sdata.*)}
 239       ${RELOCATING+*(.rela.gnu.linkonce.s.*)}
 240     }
 241   .rel.sbss    ${RELOCATING-0} :
 242     {
 243       *(.rel.sbss)
 244       ${RELOCATING+*(.rel.sbss.*)}
 245       ${RELOCATING+*(.rel.gnu.linkonce.sb.*)}
 246     }
 247   .rela.sbss   ${RELOCATING-0} :
 248     {
 249       *(.rela.sbss)
 250       ${RELOCATING+*(.rela.sbss.*)}
 251       ${RELOCATING+*(.rel.gnu.linkonce.sb.*)}
 252     }
 253   .rel.bss     ${RELOCATING-0} :
 254     {
 255       *(.rel.bss)
 256       ${RELOCATING+*(.rel.bss.*)}
 257       ${RELOCATING+*(.rel.gnu.linkonce.b.*)}
 258     }
 259   .rela.bss    ${RELOCATING-0} :
 260     {
 261       *(.rela.bss)
 262       ${RELOCATING+*(.rela.bss.*)}
 263       ${RELOCATING+*(.rela.gnu.linkonce.b.*)}
 264     }
 265   .rel.stext            ${RELOCATING-0} : { *(.rel.stest) }
 266   .rela.stext           ${RELOCATING-0} : { *(.rela.stest) }
 267   .rel.etext            ${RELOCATING-0} : { *(.rel.etest) }
 268   .rela.etext           ${RELOCATING-0} : { *(.rela.etest) }
 269   .rel.sdata            ${RELOCATING-0} : { *(.rel.sdata) }
 270   .rela.sdata           ${RELOCATING-0} : { *(.rela.sdata) }
 271   .rel.edata            ${RELOCATING-0} : { *(.rel.edata) }
 272   .rela.edata           ${RELOCATING-0} : { *(.rela.edata) }
 273   .rel.eit_v            ${RELOCATING-0} : { *(.rel.eit_v) }
 274   .rela.eit_v           ${RELOCATING-0} : { *(.rela.eit_v) }
 275   .rel.ebss             ${RELOCATING-0} : { *(.rel.ebss) }
 276   .rela.ebss            ${RELOCATING-0} : { *(.rela.ebss) }
 277   .rel.srodata          ${RELOCATING-0} : { *(.rel.srodata) }
 278   .rela.srodata         ${RELOCATING-0} : { *(.rela.srodata) }
 279   .rel.erodata          ${RELOCATING-0} : { *(.rel.erodata) }
 280   .rela.erodata         ${RELOCATING-0} : { *(.rela.erodata) }
 281   .rel.got              ${RELOCATING-0} : { *(.rel.got) }
 282   .rela.got             ${RELOCATING-0} : { *(.rela.got) }
 283   .rel.ctors            ${RELOCATING-0} : { *(.rel.ctors) }
 284   .rela.ctors           ${RELOCATING-0} : { *(.rela.ctors) }
 285   .rel.dtors            ${RELOCATING-0} : { *(.rel.dtors) }
 286   .rela.dtors           ${RELOCATING-0} : { *(.rela.dtors) }
 287   .rel.init             ${RELOCATING-0} : { *(.rel.init) }
 288   .rela.init            ${RELOCATING-0} : { *(.rela.init) }
 289   .rel.fini             ${RELOCATING-0} : { *(.rel.fini) }
 290   .rela.fini            ${RELOCATING-0} : { *(.rela.fini) }
 291   .rel.plt              ${RELOCATING-0} : { *(.rel.plt) }
 292   .rela.plt             ${RELOCATING-0} : { *(.rela.plt) }
 293
 294   /* Concatenate .page0 sections.  Put them in the page0 memory bank
 295      unless we are creating a relocatable file.  */
 296   .page0 :
 297   {
 298     *(.page0)
 299   } ${RELOCATING+ > page0}
 300
 301   /* Start of text section.  */
 302   .stext ${RELOCATING-0} :
 303   {
 304     *(.stext)
 305   } ${RELOCATING+ > ${TEXT_MEMORY}}
 306
 307   .init ${RELOCATING-0} :
 308   {
 309     KEEP (*(SORT_NONE(.init)))
 310   } ${RELOCATING+=${NOP-0}}
 311
 312   ${RELOCATING-${INSTALL_RELOC}}
 313   ${RELOCATING-${FINISH_RELOC}}
 314
 315   .text ${RELOCATING-0}:
 316   {
 317     /* Put startup code at beginning so that _start keeps same address.  */
 318     ${RELOCATING+${STARTUP_CODE}}
 319
 320     *(.text)
 321     ${RELOCATING+*(.text.*)}
 322     /* .gnu.warning sections are handled specially by elf.em.  */
 323     *(.gnu.warning)
 324     ${RELOCATING+*(.gnu.linkonce.t.*)}
 325     ${RELOCATING+*(.tramp)}
 326     ${RELOCATING+*(.tramp.*)}
 327
 328     ${RELOCATING+KEEP (*(SORT_NONE(.fini)))}
 329     ${RELOCATING+${FINISH_CODE}}
 330
 331     ${RELOCATING+_etext = .;}
 332     ${RELOCATING+PROVIDE (etext = .);}
 333     ${RELOCATING+. = ALIGN(2);}
 334   } ${RELOCATING+ > ${TEXT_MEMORY} =0xa7a7a7a7}
 335
 336   .eh_frame ${RELOCATING-0} :
 337   {
 338     KEEP (*(.eh_frame))
 339   } ${RELOCATING+ > ${TEXT_MEMORY}}
 340
 341   .gcc_except_table ${RELOCATING-0} :
 342   {
 343     *(.gcc_except_table)
 344   } ${RELOCATING+ > ${TEXT_MEMORY}}
 345
 346   .rodata  ${RELOCATING-0} :
 347   {
 348     *(.rodata)
 349     ${RELOCATING+*(.rodata.*)}
 350     ${RELOCATING+*(.gnu.linkonce.r*)}
 351     ${RELOCATING+. = ALIGN(2);}
 352   } ${RELOCATING+ > ${TEXT_MEMORY} =0xffffffff}
 353
 354   .rodata1 ${RELOCATING-0} :
 355   {
 356     *(.rodata1)
 357     ${RELOCATING+. = ALIGN(2);}
 358   } ${RELOCATING+ > ${TEXT_MEMORY} =0xffffffff}
 359
 360   /* Constructor and destructor tables are in ROM.  */
 361   ${RELOCATING+${CTOR}}
 362   ${RELOCATING+${DTOR}}
 363
 364   .jcr ${RELOCATING-0} :
 365   {
 366     KEEP (*(.jcr))
 367   } ${RELOCATING+ > ${TEXT_MEMORY}}
 368
 369   /* Start of the data section image in ROM.  */
 370   ${RELOCATING+__data_image = .;}
 371   ${RELOCATING+PROVIDE (__data_image = .);}
 372
 373   /* All read-only sections that normally go in PROM must be above.
 374      We construct the DATA image section in PROM at end of all these
 375      read-only sections.  The data image must be copied at init time.
 376      Refer to GNU ld, Section 3.6.8.2 Output Section LMA.  */
 377   .data  ${RELOCATING-0} : ${RELOCATING+AT (__data_image)}
 378   {
 379     ${RELOCATING+__data_section_start = .;}
 380     ${RELOCATING+PROVIDE (__data_section_start = .);}
 381
 382     ${RELOCATING+${DATA_START_SYMBOLS}}
 383     ${RELOCATING+*(.sdata)}
 384     *(.data)
 385     ${RELOCATING+*(.data.*)}
 386     ${RELOCATING+*(.data1)}
 387     ${RELOCATING+*(.gnu.linkonce.d.*)}
 388     ${CONSTRUCTING+CONSTRUCTORS}
 389
 390     ${RELOCATING+_edata  =  .;}
 391     ${RELOCATING+PROVIDE (edata = .);}
 392     ${RELOCATING+. = ALIGN(2);}
 393   } ${RELOCATING+ > ${DATA_MEMORY} =0xffffffff}
 394
 395   ${RELOCATING+__data_section_size = SIZEOF(.data);}
 396   ${RELOCATING+PROVIDE (__data_section_size = SIZEOF(.data));}
 397   ${RELOCATING+__data_image_end = __data_image + __data_section_size;}
 398
 399   ${RELOCATING+${PRE_COMPUTE_DATA_SIZE}}
 400
 401   /* .install ${RELOCATING-0}:
 402   {
 403     . = _data_image_end;
 404   } ${RELOCATING+ > ${TEXT_MEMORY}} */
 405
 406   /* Relocation for some bss and data sections.  */
 407   ${RELOCATING-${BSS_DATA_RELOC}}
 408   ${RELOCATING-${SOFT_REGS_RELOC}}
 409
 410   .bss ${RELOCATING-0} :
 411   {
 412     ${RELOCATING+__bss_start = .;}
 413     ${RELOCATING+*(.softregs)}
 414     ${RELOCATING+*(.sbss)}
 415     ${RELOCATING+*(.scommon)}
 416     ${RELOCATING+*(.dynbss)}
 417     *(.bss)
 418     ${RELOCATING+*(.bss.*)}
 419     ${RELOCATING+*(.gnu.linkonce.b.*)}
 420     ${RELOCATING+*(COMMON)}
 421     ${RELOCATING+PROVIDE (_end = .);}
 422   } ${RELOCATING+ > ${DATA_MEMORY}}
 423   ${RELOCATING+__bss_size = SIZEOF(.bss);}
 424   ${RELOCATING+PROVIDE (__bss_size = SIZEOF(.bss));}
 425
 426   .eeprom ${RELOCATING-0} :
 427   {
 428     *(.eeprom)
 429     ${RELOCATING+*(.eeprom.*)}
 430   } ${RELOCATING+ > ${EEPROM_MEMORY}}
 431
 432   ${RELOCATING+${VECTORS}}
 433
 434   /* Stabs debugging sections.  */
 435   .stab          0 : { *(.stab) }
 436   .stabstr       0 : { *(.stabstr) }
 437   .stab.excl     0 : { *(.stab.excl) }
 438   .stab.exclstr  0 : { *(.stab.exclstr) }
 439   .stab.index    0 : { *(.stab.index) }
 440   .stab.indexstr 0 : { *(.stab.indexstr) }
 441
 442   .comment       0 : { *(.comment) }
 443
 444   /* Treatment of DWARF debug section must be at end of the linker
 445      script to avoid problems when there are undefined symbols. It's necessary
 446      to avoid that the DWARF section is relocated before such undefined
 447      symbols are found.  */
 448 EOF
 449
 450 . $srcdir/scripttempl/DWARF.sc
 451
 452 cat <<EOF
 453 }
 454 EOF