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elfarcv2.sc revision 1.1.1.2 
      1 #
      2 # Unusual variables checked by this code:
      3 #	NOP - four byte opcode for no-op (defaults to 0)
      4 #	NO_SMALL_DATA - no .sbss/.sbss2/.sdata/.sdata2 sections if not
      5 #		empty.
      6 #	OTHER_READONLY_SECTIONS - other than .text .init .rodata ...
      7 #		(e.g., .PARISC.milli)
      8 # When adding sections, do note that the names of some sections are used
      9 # when specifying the start address of the next.
     10 #
     11 test -z "$ENTRY" && ENTRY=start
     12 test -z "${BIG_OUTPUT_FORMAT}" && BIG_OUTPUT_FORMAT=${OUTPUT_FORMAT}
     13 test -z "${LITTLE_OUTPUT_FORMAT}" && LITTLE_OUTPUT_FORMAT=${OUTPUT_FORMAT}
     14 # If we request a big endian toolchain, give a big endian linker
     15 test -z "$GOT" && GOT=".got          ${RELOCATING-0} : { *(.got.plt) *(.got) } ${RELOCATING+ > ${DATA_MEMORY}}"
     16 test "${ARC_ENDIAN}" == "big" && OUTPUT_FORMAT=${BIG_OUTPUT_FORMAT}
     17 if [ -z "$MACHINE" ]; then OUTPUT_ARCH=${ARCH}; else OUTPUT_ARCH=${ARCH}:${MACHINE}; fi
     18 test -z "${ELFSIZE}" && ELFSIZE=32
     19 test -z "${ALIGNMENT}" && ALIGNMENT="${ELFSIZE} / 8"
     20 test "$LD_FLAG" = "N" && DATA_ADDR=.
     21 
     22 CTOR=".ctors        ${CONSTRUCTING-0} :
     23   {
     24     ${CONSTRUCTING+${CTOR_START}}
     25     /* gcc uses crtbegin.o to find the start of
     26        the constructors, so we make sure it is
     27        first.  Because this is a wildcard, it
     28        doesn't matter if the user does not
     29        actually link against crtbegin.o; the
     30        linker won't look for a file to match a
     31        wildcard.  The wildcard also means that it
     32        doesn't matter which directory crtbegin.o
     33        is in.  */
     34 
     35     KEEP (*crtbegin*.o(.ctors))
     36 
     37     /* We don't want to include the .ctor section from
     38        from the crtend.o file until after the sorted ctors.
     39        The .ctor section from the crtend file contains the
     40        end of ctors marker and it must be last */
     41 
     42     KEEP (*(EXCLUDE_FILE (*crtend*.o $OTHER_EXCLUDE_FILES) .ctors))
     43     KEEP (*(SORT(.ctors.*)))
     44     KEEP (*(.ctors))
     45     ${CONSTRUCTING+${CTOR_END}}
     46   } ${RELOCATING+ > ${DATA_MEMORY}}"
     47 DTOR=".dtors        ${CONSTRUCTING-0} :
     48   {
     49     ${CONSTRUCTING+${DTOR_START}}
     50     KEEP (*crtbegin*.o(.dtors))
     51     KEEP (*(EXCLUDE_FILE (*crtend*.o $OTHER_EXCLUDE_FILES) .dtors))
     52     KEEP (*(SORT(.dtors.*)))
     53     KEEP (*(.dtors))
     54     ${CONSTRUCTING+${DTOR_END}}
     55   } ${RELOCATING+ > ${DATA_MEMORY}}"
     56 
     57 if test -z "${NO_SMALL_DATA}"; then
     58   SBSS=".sbss         ${RELOCATING-0} :
     59   {
     60     ${RELOCATING+PROVIDE (__sbss_start = .);}
     61     ${RELOCATING+PROVIDE (___sbss_start = .);}
     62     *(.dynsbss)
     63     *(.sbss${RELOCATING+ .sbss.* .gnu.linkonce.sb.*})
     64     *(.scommon)
     65     ${RELOCATING+PROVIDE (__sbss_end = .);}
     66     ${RELOCATING+PROVIDE (___sbss_end = .);}
     67   } ${RELOCATING+ > ${SDATA_MEMORY}}"
     68   SBSS2=".sbss2        ${RELOCATING-0} : { *(.sbss2${RELOCATING+ .sbss2.* .gnu.linkonce.sb2.*}) } ${RELOCATING+ > ${SDATA_MEMORY}}"
     69   SDATA="/* We want the small data sections together, so single-instruction offsets
     70      can access them all, and initialized data all before uninitialized, so
     71      we can shorten the on-disk segment size.  */
     72   .sdata        ${RELOCATING-0} :
     73   {
     74     ${RELOCATING+${SDATA_START_SYMBOLS}}
     75     *(.sdata${RELOCATING+ .sdata.* .gnu.linkonce.s.*})
     76 
     77     ${RELOCATING+_edata  =  .;}
     78     ${RELOCATING+PROVIDE (edata = .);}
     79   } ${RELOCATING+ > ${SDATA_MEMORY}}"
     80   SDATA2=".sdata2       ${RELOCATING-0} : { *(.sdata2${RELOCATING+ .sdata2.* .gnu.linkonce.s2.*}) } ${RELOCATING+ > ${SDATA_MEMORY}}"
     81   REL_SDATA=".rel.sdata    ${RELOCATING-0} : { *(.rel.sdata${RELOCATING+ .rel.sdata.* .rel.gnu.linkonce.s.*}) }
     82   .rela.sdata   ${RELOCATING-0} : { *(.rela.sdata${RELOCATING+ .rela.sdata.* .rela.gnu.linkonce.s.*}) }"
     83   REL_SBSS=".rel.sbss     ${RELOCATING-0} : { *(.rel.sbss${RELOCATING+ .rel.sbss.* .rel.gnu.linkonce.sb.*}) }
     84   .rela.sbss    ${RELOCATING-0} : { *(.rela.sbss${RELOCATING+ .rela.sbss.* .rela.gnu.linkonce.sb.*}) }"
     85   REL_SDATA2=".rel.sdata2   ${RELOCATING-0} : { *(.rel.sdata2${RELOCATING+ .rel.sdata2.* .rel.gnu.linkonce.s2.*}) }
     86   .rela.sdata2  ${RELOCATING-0} : { *(.rela.sdata2${RELOCATING+ .rela.sdata2.* .rela.gnu.linkonce.s2.*}) }"
     87   REL_SBSS2=".rel.sbss2    ${RELOCATING-0} : { *(.rel.sbss2${RELOCATING+ .rel.sbss2.* .rel.gnu.linkonce.sb2.*}) }
     88   .rela.sbss2   ${RELOCATING-0} : { *(.rela.sbss2${RELOCATING+ .rela.sbss2.* .rela.gnu.linkonce.sb2.*}) }"
     89 fi
     90 
     91 #
     92 # We provide two emulations: a fixed on that defines some memory banks
     93 # and a configurable one that includes a user provided memory definition.
     94 #
     95 case $GENERIC_BOARD in
     96   yes|1|YES)
     97 	MEMORY_DEF="
     98 /* Get memory banks definition from some user configuration file.
     99    This file must be located in some linker directory (search path
    100    with -L<dir>). See fixed memory banks emulation script.  */
    101 INCLUDE memory.x;
    102 "
    103 	;;
    104   *)
    105 MEMORY_DEF="
    106 /* Fixed definition of the available memory banks.
    107    See generic emulation script for a user defined configuration.  */
    108 MEMORY
    109 {
    110     ICCM : ORIGIN = 0x00000000, LENGTH = ${ICCM_SIZE}
    111     DCCM : ORIGIN = ${RAM_START_ADDR}, LENGTH = ${RAM_SIZE}
    112 }
    113 
    114 /* Setup the stack on the top of the data memory bank.  */
    115 PROVIDE (__stack_top = (${RAM_START_ADDR} + ${RAM_SIZE} - 1) & -4);
    116 PROVIDE (__end_heap = ${RAM_START_ADDR} + ${RAM_SIZE} - 1);
    117 "
    118 	;;
    119 esac
    120 
    121 cat <<EOF
    122 OUTPUT_FORMAT("${OUTPUT_FORMAT}", "${BIG_OUTPUT_FORMAT}", "${LITTLE_OUTPUT_FORMAT}")
    123 OUTPUT_ARCH(${OUTPUT_ARCH})
    124 ${RELOCATING+ENTRY(${ENTRY})}
    125 
    126 ${RELOCATING+${LIB_SEARCH_DIRS}}
    127 ${RELOCATING+${EXECUTABLE_SYMBOLS}}
    128 ${RELOCATING+${MEMORY_DEF}}
    129 
    130 SECTIONS
    131 {
    132   .ivt 0x00 :
    133   {
    134    KEEP (*(.ivt));
    135   } ${RELOCATING+ > ${STARTUP_MEMORY}}
    136 
    137   .startup 0x100:
    138   {
    139     KEEP (*crt0.o(.text.__startup))
    140   } ${RELOCATING+ > ${STARTUP_MEMORY}}
    141 
    142   /* Read-only sections, merged into text segment: */
    143   ${TEXT_DYNAMIC+${DYNAMIC}}
    144   .hash        ${RELOCATING-0} : { *(.hash)		}
    145   .dynsym      ${RELOCATING-0} : { *(.dynsym)		}
    146   .dynstr      ${RELOCATING-0} : { *(.dynstr)		}
    147   .gnu.version ${RELOCATING-0} : { *(.gnu.version)	}
    148   .gnu.version_d ${RELOCATING-0} : { *(.gnu.version_d)	}
    149   .gnu.version_r ${RELOCATING-0} : { *(.gnu.version_r)	}
    150 
    151   .rel.init     ${RELOCATING-0} : { *(.rel.init) }
    152   .rela.init    ${RELOCATING-0} : { *(.rela.init) }
    153   .rel.text     ${RELOCATING-0} : { *(.rel.text${RELOCATING+ .rel.text.* .rel.gnu.linkonce.t.*}) }
    154   .rela.text    ${RELOCATING-0} : { *(.rela.text${RELOCATING+ .rela.text.* .rela.gnu.linkonce.t.*}) }
    155   .rel.fini     ${RELOCATING-0} : { *(.rel.fini) }
    156   .rela.fini    ${RELOCATING-0} : { *(.rela.fini) }
    157   .rel.rodata   ${RELOCATING-0} : { *(.rel.rodata${RELOCATING+ .rel.rodata.* .rel.gnu.linkonce.r.*}) }
    158   .rela.rodata  ${RELOCATING-0} : { *(.rela.rodata${RELOCATING+ .rela.rodata.* .rela.gnu.linkonce.r.*}) }
    159   .rel.data     ${RELOCATING-0} : { *(.rel.data${RELOCATING+ .rel.data.* .rel.gnu.linkonce.d.*}) }
    160   .rela.data    ${RELOCATING-0} : { *(.rela.data${RELOCATING+ .rela.data.* .rela.gnu.linkonce.d.*}) }
    161   .rel.tdata	${RELOCATING-0} : { *(.rel.tdata${RELOCATING+ .rel.tdata.* .rel.gnu.linkonce.td.*}) }
    162   .rela.tdata	${RELOCATING-0} : { *(.rela.tdata${RELOCATING+ .rela.tdata.* .rela.gnu.linkonce.td.*}) }
    163   .rel.tbss	${RELOCATING-0} : { *(.rel.tbss${RELOCATING+ .rel.tbss.* .rel.gnu.linkonce.tb.*}) }
    164   .rela.tbss	${RELOCATING-0} : { *(.rela.tbss${RELOCATING+ .rela.tbss.* .rela.gnu.linkonce.tb.*}) }
    165   .rel.ctors    ${RELOCATING-0} : { *(.rel.ctors) }
    166   .rela.ctors   ${RELOCATING-0} : { *(.rela.ctors) }
    167   .rel.dtors    ${RELOCATING-0} : { *(.rel.dtors) }
    168   .rela.dtors   ${RELOCATING-0} : { *(.rela.dtors) }
    169   .rel.got      ${RELOCATING-0} : { *(.rel.got) }
    170   .rela.got     ${RELOCATING-0} : { *(.rela.got) }
    171   ${REL_SDATA}
    172   ${REL_SBSS}
    173   ${REL_SDATA2}
    174   ${REL_SBSS2}
    175   .rel.bss      ${RELOCATING-0} : { *(.rel.bss${RELOCATING+ .rel.bss.* .rel.gnu.linkonce.b.*}) }
    176   .rela.bss     ${RELOCATING-0} : { *(.rela.bss${RELOCATING+ .rela.bss.* .rela.gnu.linkonce.b.*}) }
    177 
    178   .jcr : { KEEP (*(.jcr)) } ${RELOCATING+> ${TEXT_MEMORY}}
    179   .eh_frame : { KEEP (*(.eh_frame)) } ${RELOCATING+> ${TEXT_MEMORY}}
    180   .gcc_except_table : { *(.gcc_except_table) *(.gcc_except_table.*) } ${RELOCATING+> ${TEXT_MEMORY}}
    181   .plt : { *(.plt) } ${RELOCATING+> ${TEXT_MEMORY}}
    182   .jlitab :
    183   {
    184     ${RELOCATING+${JLI_START_TABLE}}
    185      jlitab*.o:(.jlitab*) *(.jlitab*)
    186   } ${RELOCATING+> ${TEXT_MEMORY}}
    187 
    188   .rodata ${RELOCATING-0} :
    189   {
    190     *(.rodata) ${RELOCATING+*(.rodata.*)} ${RELOCATING+*(.gnu.linkonce.r.*)}
    191   } ${RELOCATING+> ${TEXT_MEMORY}}
    192 
    193   .rodata1      ${RELOCATING-0} : { *(.rodata1) } ${RELOCATING+> ${TEXT_MEMORY}}
    194 
    195   .init         ${RELOCATING-0} :
    196   {
    197     ${RELOCATING+${INIT_START}}
    198     KEEP (*(.init))
    199     ${RELOCATING+${INIT_END}}
    200   } ${RELOCATING+ > ${TEXT_MEMORY}}  =${NOP-0}
    201 
    202   .text         ${RELOCATING-0} :
    203   {
    204     ${RELOCATING+${TEXT_START_SYMBOLS}}
    205 
    206     *(.text .stub${RELOCATING+ .text.* .gnu.linkonce.t.*})
    207     /* .gnu.warning sections are handled specially by elf32.em.  */
    208     *(.gnu.warning)
    209 
    210     ${RELOCATING+${OTHER_TEXT_SECTIONS}}
    211 
    212   } ${RELOCATING+ > ${TEXT_MEMORY}} =${NOP-0}
    213 
    214   .fini         ${RELOCATING-0} :
    215   {
    216     ${RELOCATING+${FINI_START}}
    217     KEEP (*(.fini))
    218     ${RELOCATING+${FINI_END}}
    219 
    220     ${RELOCATING+PROVIDE (__etext = .);}
    221     ${RELOCATING+PROVIDE (_etext = .);}
    222     ${RELOCATING+PROVIDE (etext = .);}
    223   } ${RELOCATING+ > ${TEXT_MEMORY}} =${NOP-0}
    224 
    225   ${RELOCATING+${OTHER_READONLY_SECTIONS}}
    226 
    227   /* Start of the data section image in ROM.  */
    228   ${RELOCATING+__data_image = .;}
    229   ${RELOCATING+PROVIDE (__data_image = .);}
    230 
    231   .data	${RELOCATING-0} :
    232   {
    233     ${RELOCATING+ PROVIDE (__data_start = .) ; }
    234     /* --gc-sections will delete empty .data. This leads to wrong start
    235        addresses for subsequent sections because -Tdata= from the command
    236        line will have no effect, see PR13697.  Thus, keep .data  */
    237     KEEP (*(.data))
    238     ${RELOCATING+${DATA_START_SYMBOLS}}
    239     *(.data${RELOCATING+ .data.* .gnu.linkonce.d.*})
    240     ${CONSTRUCTING+SORT(CONSTRUCTORS)}
    241 
    242   } ${RELOCATING+ > ${DATA_MEMORY}}
    243 
    244   ${GOT}
    245   ${RELOCATING+${CTOR}}
    246   ${RELOCATING+${DTOR}}
    247 
    248   ${RELOCATING+${SDATA}}
    249   ${RELOCATING+${SDATA2}}
    250   ${RELOCATING+${SBSS}}
    251   ${RELOCATING+${SBSS2}}
    252   .bss          ${RELOCATING-0} :
    253   {
    254    *(.dynbss)
    255    *(.bss${RELOCATING+ .bss.* .gnu.linkonce.b.*})
    256    *(COMMON)
    257    /* Align here to ensure that the .bss section occupies space up to
    258       _end.  Align after .bss to ensure correct alignment even if the
    259       .bss section disappears because there are no input sections.  */
    260    ${RELOCATING+. = ALIGN(${ALIGNMENT});}
    261    ${RELOCATING+_end = .;}
    262    ${RELOCATING+PROVIDE (end = .);}
    263   } ${RELOCATING+ > ${DATA_MEMORY}}
    264 
    265   /* Global data not cleared after reset.  */
    266   .noinit ${RELOCATING-0}:
    267   {
    268     *(.noinit*)
    269     ${RELOCATING+. = ALIGN(${ALIGNMENT});}
    270     ${RELOCATING+ PROVIDE (__start_heap = .) ; }
    271   } ${RELOCATING+ > ${DATA_MEMORY}}
    272 
    273 
    274   /* Stabs debugging sections.  */
    275   .stab          0 : { *(.stab) }
    276   .stabstr       0 : { *(.stabstr) }
    277   .stab.excl     0 : { *(.stab.excl) }
    278   .stab.exclstr  0 : { *(.stab.exclstr) }
    279   .stab.index    0 : { *(.stab.index) }
    280   .stab.indexstr 0 : { *(.stab.indexstr) }
    281 
    282   .comment       0 : { *(.comment) }
    283 
    284   /* DWARF debug sections.
    285      Symbols in the DWARF debugging sections are relative to the beginning
    286      of the section so we begin them at 0.  */
    287 
    288   /* DWARF 1 */
    289   .debug          0 : { *(.debug) }
    290   .line           0 : { *(.line) }
    291 
    292   /* GNU DWARF 1 extensions */
    293   .debug_srcinfo  0 : { *(.debug_srcinfo) }
    294   .debug_sfnames  0 : { *(.debug_sfnames) }
    295 
    296   /* DWARF 1.1 and DWARF 2 */
    297   .debug_aranges  0 : { *(.debug_aranges) }
    298   .debug_pubnames 0 : { *(.debug_pubnames) }
    299 
    300   /* DWARF 2 */
    301   .debug_info     0 : { *(.debug_info) *(.gnu.linkonce.wi.*) }
    302   .debug_abbrev   0 : { *(.debug_abbrev) }
    303   .debug_line     0 : { *(.debug_line) }
    304   .debug_frame    0 : { *(.debug_frame) }
    305   .debug_str      0 : { *(.debug_str) }
    306   .debug_loc      0 : { *(.debug_loc) }
    307   .debug_macinfo  0 : { *(.debug_macinfo) }
    308 
    309   /* DWARF 3 */
    310   .debug_pubtypes 0 : { *(.debug_pubtypes) }
    311   .debug_ranges   0 : { *(.debug_ranges) }
    312 
    313   /* DWARF Extension.  */
    314   .debug_macro    0 : { *(.debug_macro) }
    315 
    316   /* ARC Extension Sections */
    317   .arcextmap	  0 : { *(.gnu.linkonce.arcextmap.*) }
    318 }
    319 EOF
    320