ld/scripttempl/elfm68hc12.sc

   1 #
   2 # Unusual variables checked by this code:
   3 #       NOP - two 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+ __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+ __CTOR_END__ = .; }
  43   } ${RELOCATING+ > ${DATA_MEMORY}}"
  44
  45 DTOR="  .dtors  ${CONSTRUCTING-0} :
  46   {
  47     ${CONSTRUCTING+ __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+ __DTOR_END__ = .; }
  55   } ${RELOCATING+ > ${DATA_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     *(.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     *(.install0)        /* Section should setup the stack pointer.  */
 114     *(.install1)        /* Place holder for applications.  */
 115     *(.install2)        /* Optional installation of data sections in RAM.  */
 116     *(.install3)        /* Place holder for applications.  */
 117     *(.install4)        /* Section that calls the main.  */
 118 "
 119
 120 PRE_COMPUTE_DATA_SIZE="
 121 /* SCz: this does not work yet... This is supposed to force the loading
 122    of _map_data.o (from libgcc.a) when the .data section is not empty.
 123    By doing so, this should bring the code that copies the .data section
 124    from ROM to RAM at init time.
 125
 126   ___pre_comp_data_size = SIZEOF(.data);
 127   __install_data_sections = ___pre_comp_data_size > 0 ?
 128                 __map_data_sections : 0;
 129 */
 130 "
 131
 132 INSTALL_RELOC="
 133   .install0 0 : { *(.install0) }
 134   .install1 0 : { *(.install1) }
 135   .install2 0 : { *(.install2) }
 136   .install3 0 : { *(.install3) }
 137   .install4 0 : { *(.install4) }
 138 "
 139
 140 BSS_DATA_RELOC="
 141   .data1 0 : { *(.data1) }
 142
 143   /* We want the small data sections together, so single-instruction offsets
 144      can access them all, and initialized data all before uninitialized, so
 145      we can shorten the on-disk segment size.  */
 146   .sdata   0 : { *(.sdata) }
 147   .sbss    0 : { *(.sbss) }
 148   .scommon 0 : { *(.scommon) }
 149 "
 150
 151 cat <<EOF
 152 ${RELOCATING+/* Linker script for 68HC12 executable (PROM).  */}
 153 ${RELOCATING-/* Linker script for 68HC12 object file (ld -r).  */}
 154
 155 OUTPUT_FORMAT("${OUTPUT_FORMAT}", "${BIG_OUTPUT_FORMAT}",
 156               "${LITTLE_OUTPUT_FORMAT}")
 157 OUTPUT_ARCH(${OUTPUT_ARCH})
 158 ENTRY(${ENTRY})
 159
 160 ${RELOCATING+${LIB_SEARCH_DIRS}}
 161 ${RELOCATING+${EXECUTABLE_SYMBOLS}}
 162 ${RELOCATING+${MEMORY_DEF}}
 163
 164 SECTIONS
 165 {
 166   .hash        ${RELOCATING-0} : { *(.hash)             }
 167   .dynsym      ${RELOCATING-0} : { *(.dynsym)           }
 168   .dynstr      ${RELOCATING-0} : { *(.dynstr)           }
 169   .gnu.version          ${RELOCATING-0} : { *(.gnu.version) }
 170   .gnu.version_d        ${RELOCATING-0} : { *(.gnu.version_d) }
 171   .gnu.version_r        ${RELOCATING-0} : { *(.gnu.version_r) }
 172
 173   .rela.text            ${RELOCATING-0} : { *(.rela.text) *(.rela.gnu.linkonce.t*) }
 174   .rela.data            ${RELOCATING-0} : { *(.rela.data) *(.rela.gnu.linkonce.d*) }
 175   .rela.rodata          ${RELOCATING-0} : { *(.rela.rodata) *(.rela.gnu.linkonce.r*) }
 176   .rela.stext           ${RELOCATING-0} : { *(.rela.stest) }
 177   .rela.etext           ${RELOCATING-0} : { *(.rela.etest) }
 178   .rela.sdata           ${RELOCATING-0} : { *(.rela.sdata) }
 179   .rela.edata           ${RELOCATING-0} : { *(.rela.edata) }
 180   .rela.eit_v           ${RELOCATING-0} : { *(.rela.eit_v) }
 181   .rela.sbss            ${RELOCATING-0} : { *(.rela.sbss) }
 182   .rela.ebss            ${RELOCATING-0} : { *(.rela.ebss) }
 183   .rela.srodata         ${RELOCATING-0} : { *(.rela.srodata) }
 184   .rela.erodata         ${RELOCATING-0} : { *(.rela.erodata) }
 185   .rela.got             ${RELOCATING-0} : { *(.rela.got) }
 186   .rela.ctors           ${RELOCATING-0} : { *(.rela.ctors) }
 187   .rela.dtors           ${RELOCATING-0} : { *(.rela.dtors) }
 188   .rela.init            ${RELOCATING-0} : { *(.rela.init) }
 189   .rela.fini            ${RELOCATING-0} : { *(.rela.fini) }
 190   .rela.bss             ${RELOCATING-0} : { *(.rela.bss) }
 191   .rela.plt             ${RELOCATING-0} : { *(.rela.plt) }
 192
 193   .rel.data             ${RELOCATING-0} : { *(.rel.data) *(.rel.gnu.linkonce.d*) }
 194   .rel.rodata           ${RELOCATING-0} : { *(.rel.rodata) *(.rel.gnu.linkonce.r*) }
 195   .rel.stext            ${RELOCATING-0} : { *(.rel.stest) }
 196   .rel.etext            ${RELOCATING-0} : { *(.rel.etest) }
 197   .rel.sdata            ${RELOCATING-0} : { *(.rel.sdata) }
 198   .rel.edata            ${RELOCATING-0} : { *(.rel.edata) }
 199   .rel.sbss             ${RELOCATING-0} : { *(.rel.sbss) }
 200   .rel.ebss             ${RELOCATING-0} : { *(.rel.ebss) }
 201   .rel.eit_v            ${RELOCATING-0} : { *(.rel.eit_v) }
 202   .rel.srodata          ${RELOCATING-0} : { *(.rel.srodata) }
 203   .rel.erodata          ${RELOCATING-0} : { *(.rel.erodata) }
 204   .rel.got              ${RELOCATING-0} : { *(.rel.got) }
 205   .rel.ctors            ${RELOCATING-0} : { *(.rel.ctors) }
 206   .rel.dtors            ${RELOCATING-0} : { *(.rel.dtors) }
 207   .rel.init             ${RELOCATING-0} : { *(.rel.init) }
 208   .rel.fini             ${RELOCATING-0} : { *(.rel.fini) }
 209   .rel.bss              ${RELOCATING-0} : { *(.rel.bss) }
 210   .rel.plt              ${RELOCATING-0} : { *(.rel.plt) }
 211
 212   /* Concatenate .page0 sections.  Put them in the page0 memory bank
 213      unless we are creating a relocatable file.  */
 214   .page0 :
 215   {
 216     *(.page0)
 217   } ${RELOCATING+ > page0}
 218
 219   /* Start of text section.  */
 220   .stext ${RELOCATING-0} :
 221   {
 222     *(.stext)
 223   } ${RELOCATING+ > ${TEXT_MEMORY}}
 224
 225   .init ${RELOCATING-0} :
 226   {
 227     *(.init)
 228   } ${RELOCATING+=${NOP-0}}
 229
 230   ${RELOCATING-${INSTALL_RELOC}}
 231
 232   .text ${RELOCATING-0}:
 233   {
 234     /* Put startup code at beginning so that _start keeps same address.  */
 235     ${RELOCATING+${STARTUP_CODE}}
 236
 237     ${RELOCATING+*(.init)}
 238     *(.text)
 239     *(.fini)
 240     /* .gnu.warning sections are handled specially by elf32.em.  */
 241     *(.gnu.warning)
 242     *(.gnu.linkonce.t*)
 243
 244     ${RELOCATING+_etext = .;}
 245     ${RELOCATING+PROVIDE (etext = .);}
 246
 247   } ${RELOCATING+ > ${TEXT_MEMORY}}
 248
 249   .eh_frame ${RELOCATING-0} :
 250   {
 251     *(.eh_frame)
 252   } ${RELOCATING+ > ${TEXT_MEMORY}}
 253
 254   .rodata  ${RELOCATING-0} :
 255   {
 256     *(.rodata)
 257     *(.gnu.linkonce.r*)
 258   } ${RELOCATING+ > ${TEXT_MEMORY}}
 259
 260   .rodata1 ${RELOCATING-0} :
 261   {
 262     *(.rodata1)
 263   } ${RELOCATING+ > ${TEXT_MEMORY}}
 264
 265   /* Start of the data section image in ROM.  */
 266   ${RELOCATING+__data_image = .;}
 267   ${RELOCATING+PROVIDE (__data_image = .);}
 268
 269   /* All read-only sections that normally go in PROM must be above.
 270      We construct the DATA image section in PROM at end of all these
 271      read-only sections.  The data image must be copied at init time.
 272      Refer to GNU ld, Section 3.6.8.2 Output Section LMA.  */
 273   .data  ${RELOCATING-0} : ${RELOCATING+AT (__data_image)}
 274   {
 275     ${RELOCATING+__data_section_start = .;}
 276     ${RELOCATING+PROVIDE (__data_section_start = .);}
 277
 278     ${RELOCATING+${DATA_START_SYMBOLS}}
 279     ${RELOCATING+*(.sdata)}
 280     *(.data)
 281     ${RELOCATING+*(.data1)}
 282     *(.gnu.linkonce.d*)
 283     ${CONSTRUCTING+CONSTRUCTORS}
 284
 285     ${RELOCATING+_edata  =  .;}
 286     ${RELOCATING+PROVIDE (edata = .);}
 287   } ${RELOCATING+ > ${DATA_MEMORY}}
 288
 289   ${RELOCATING+__data_section_size = SIZEOF(.data);}
 290   ${RELOCATING+PROVIDE (__data_section_size = SIZEOF(.data));}
 291   ${RELOCATING+__data_image_end = __data_image + __data_section_size;}
 292
 293   ${RELOCATING+${PRE_COMPUTE_DATA_SIZE}}
 294
 295   /* .install ${RELOCATING-0}:
 296   {
 297     . = _data_image_end;
 298   } ${RELOCATING+ > ${TEXT_MEMORY}} */
 299
 300   /* Relocation for some bss and data sections.  */
 301   ${RELOCATING-${BSS_DATA_RELOC}}
 302
 303   .bss ${RELOCATING-0} :
 304   {
 305     ${RELOCATING+__bss_start = .;}
 306     ${RELOCATING+*(.sbss)}
 307     ${RELOCATING+*(.scommon)}
 308
 309     *(.dynbss)
 310     *(.bss)
 311     *(COMMON)
 312     ${RELOCATING+PROVIDE (_end = .);}
 313   } ${RELOCATING+ > ${DATA_MEMORY}}
 314
 315   ${RELOCATING+${CTOR}}
 316   ${RELOCATING+${DTOR}}
 317
 318   ${RELOCATING+${VECTORS}}
 319
 320   /* Stabs debugging sections.  */
 321   .stab          0 : { *(.stab) }
 322   .stabstr       0 : { *(.stabstr) }
 323   .stab.excl     0 : { *(.stab.excl) }
 324   .stab.exclstr  0 : { *(.stab.exclstr) }
 325   .stab.index    0 : { *(.stab.index) }
 326   .stab.indexstr 0 : { *(.stab.indexstr) }
 327
 328   .comment       0 : { *(.comment) }
 329
 330   /* DWARF debug sections.
 331      Symbols in the DWARF debugging sections are relative to the beginning
 332      of the section so we begin them at 0.
 333      Treatment of DWARF debug section must be at end of the linker
 334      script to avoid problems when there are undefined symbols. It's necessary
 335      to avoid that the DWARF section is relocated before such undefined
 336      symbols are found.  */
 337
 338   /* DWARF 1 */
 339   .debug         0 : { *(.debug) }
 340   .line          0 : { *(.line) }
 341
 342   /* GNU DWARF 1 extensions */
 343   .debug_srcinfo 0 : { *(.debug_srcinfo) }
 344   .debug_sfnames 0 : { *(.debug_sfnames) }
 345
 346   /* DWARF 1.1 and DWARF 2 */
 347   .debug_aranges  0 : { *(.debug_aranges) }
 348   .debug_pubnames 0 : { *(.debug_pubnames) }
 349
 350   /* DWARF 2 */
 351   .debug_info     0 : { *(.debug_info) }
 352   .debug_abbrev   0 : { *(.debug_abbrev) }
 353   .debug_line     0 : { *(.debug_line) }
 354   .debug_frame    0 : { *(.debug_frame) }
 355   .debug_str      0 : { *(.debug_str) }
 356   .debug_loc      0 : { *(.debug_loc) }
 357   .debug_macinfo  0 : { *(.debug_macinfo) }
 358 }
 359 EOF