ld/scripttempl/elf.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 #       INITIAL_READONLY_SECTIONS - at start of text segment
   6 #       OTHER_READONLY_SECTIONS - other than .text .init .rodata ...
   7 #               (e.g., .PARISC.milli)
   8 #       OTHER_TEXT_SECTIONS - these get put in .text when relocating
   9 #       OTHER_READWRITE_SECTIONS - other than .data .bss .ctors .sdata ...
  10 #               (e.g., .PARISC.global)
  11 #       OTHER_SECTIONS - at the end
  12 #       EXECUTABLE_SYMBOLS - symbols that must be defined for an
  13 #               executable (e.g., _DYNAMIC_LINK)
  14 #       TEXT_START_SYMBOLS - symbols that appear at the start of the
  15 #               .text section.
  16 #       DATA_START_SYMBOLS - symbols that appear at the start of the
  17 #               .data section.
  18 #       OTHER_GOT_SYMBOLS - symbols defined just before .got.
  19 #       OTHER_GOT_SECTIONS - sections just after .got and .sdata.
  20 #       OTHER_BSS_SYMBOLS - symbols that appear at the start of the
  21 #               .bss section besides __bss_start.
  22 #       DATA_PLT - .plt should be in data segment, not text segment.
  23 #       TEXT_DYNAMIC - .dynamic in text segment, not data segment.
  24 #       EMBEDDED - whether this is for an embedded system.
  25 #       SHLIB_TEXT_START_ADDR - if set, add to SIZEOF_HEADERS to set
  26 #               start address of shared library.
  27 #       INPUT_FILES - INPUT command of files to always include
  28 #
  29 # When adding sections, do note that the names of some sections are used
  30 # when specifying the start address of the next.
  31 #
  32
  33 test -z "$ENTRY" && ENTRY=_start
  34 test -z "${BIG_OUTPUT_FORMAT}" && BIG_OUTPUT_FORMAT=${OUTPUT_FORMAT}
  35 test -z "${LITTLE_OUTPUT_FORMAT}" && LITTLE_OUTPUT_FORMAT=${OUTPUT_FORMAT}
  36 if [ -z "$MACHINE" ]; then OUTPUT_ARCH=${ARCH}; else OUTPUT_ARCH=${ARCH}:${MACHINE}; fi
  37 test -z "${ELFSIZE}" && ELFSIZE=32
  38 test -z "${ALIGNMENT}" && ALIGNMENT="${ELFSIZE} / 8"
  39 test "$LD_FLAG" = "N" && DATA_ADDR=.
  40 INTERP=".interp   ${RELOCATING-0} : { *(.interp)        }"
  41 PLT=".plt    ${RELOCATING-0} : { *(.plt)        }"
  42 DYNAMIC=".dynamic     ${RELOCATING-0} : { *(.dynamic) }"
  43
  44 # if this is for an embedded system, don't add SIZEOF_HEADERS.
  45 if [ -z "$EMBEDDED" ]; then
  46    test -z "${TEXT_BASE_ADDRESS}" && TEXT_BASE_ADDRESS="${TEXT_START_ADDR} + SIZEOF_HEADERS"
  47 else
  48    test -z "${TEXT_BASE_ADDRESS}" && TEXT_BASE_ADDRESS="${TEXT_START_ADDR}"
  49 fi
  50
  51 cat <<EOF
  52 OUTPUT_FORMAT("${OUTPUT_FORMAT}", "${BIG_OUTPUT_FORMAT}",
  53               "${LITTLE_OUTPUT_FORMAT}")
  54 OUTPUT_ARCH(${OUTPUT_ARCH})
  55 ENTRY(${ENTRY})
  56
  57 ${RELOCATING+${LIB_SEARCH_DIRS}}
  58 ${RELOCATING+/* Do we need any of these for elf?
  59    __DYNAMIC = 0; ${STACKZERO+${STACKZERO}} ${SHLIB_PATH+${SHLIB_PATH}}  */}
  60 ${RELOCATING+${EXECUTABLE_SYMBOLS}}
  61 ${RELOCATING+${INPUT_FILES}}
  62 ${RELOCATING- /* For some reason, the Solaris linker makes bad executables
  63   if gld -r is used and the intermediate file has sections starting
  64   at non-zero addresses.  Could be a Solaris ld bug, could be a GNU ld
  65   bug.  But for now assigning the zero vmas works.  */}
  66
  67 SECTIONS
  68 {
  69   /* Read-only sections, merged into text segment: */
  70   ${CREATE_SHLIB-${RELOCATING+. = ${TEXT_BASE_ADDRESS};}}
  71   ${CREATE_SHLIB+${RELOCATING+. = ${SHLIB_TEXT_START_ADDR:-0} + SIZEOF_HEADERS;}}
  72   ${CREATE_SHLIB-${INTERP}}
  73   ${INITIAL_READONLY_SECTIONS}
  74   ${TEXT_DYNAMIC+${DYNAMIC}}
  75   .hash        ${RELOCATING-0} : { *(.hash)             }
  76   .dynsym      ${RELOCATING-0} : { *(.dynsym)           }
  77   .dynstr      ${RELOCATING-0} : { *(.dynstr)           }
  78   .gnu.version ${RELOCATING-0} : { *(.gnu.version)      }
  79   .gnu.version_d ${RELOCATING-0} : { *(.gnu.version_d)  }
  80   .gnu.version_r ${RELOCATING-0} : { *(.gnu.version_r)  }
  81   .rel.text    ${RELOCATING-0} :
  82     {
  83       *(.rel.text)
  84       ${RELOCATING+*(.rel.text.*)}
  85       ${RELOCATING+*(.rel.gnu.linkonce.t*)}
  86     }
  87   .rela.text   ${RELOCATING-0} :
  88     {
  89       *(.rela.text)
  90       ${RELOCATING+*(.rela.text.*)}
  91       ${RELOCATING+*(.rela.gnu.linkonce.t*)}
  92     }
  93   .rel.data    ${RELOCATING-0} :
  94     {
  95       *(.rel.data)
  96       ${RELOCATING+*(.rel.data.*)}
  97       ${RELOCATING+*(.rel.gnu.linkonce.d*)}
  98     }
  99   .rela.data   ${RELOCATING-0} :
 100     {
 101       *(.rela.data)
 102       ${RELOCATING+*(.rela.data.*)}
 103       ${RELOCATING+*(.rela.gnu.linkonce.d*)}
 104     }
 105   .rel.rodata  ${RELOCATING-0} :
 106     {
 107       *(.rel.rodata)
 108       ${RELOCATING+*(.rel.rodata.*)}
 109       ${RELOCATING+*(.rel.gnu.linkonce.r*)}
 110     }
 111   .rela.rodata ${RELOCATING-0} :
 112     {
 113       *(.rela.rodata)
 114       ${RELOCATING+*(.rela.rodata.*)}
 115       ${RELOCATING+*(.rela.gnu.linkonce.r*)}
 116     }
 117   .rel.got     ${RELOCATING-0} : { *(.rel.got)          }
 118   .rela.got    ${RELOCATING-0} : { *(.rela.got)         }
 119   .rel.ctors   ${RELOCATING-0} : { *(.rel.ctors)        }
 120   .rela.ctors  ${RELOCATING-0} : { *(.rela.ctors)       }
 121   .rel.dtors   ${RELOCATING-0} : { *(.rel.dtors)        }
 122   .rela.dtors  ${RELOCATING-0} : { *(.rela.dtors)       }
 123   .rel.init    ${RELOCATING-0} : { *(.rel.init) }
 124   .rela.init   ${RELOCATING-0} : { *(.rela.init)        }
 125   .rel.fini    ${RELOCATING-0} : { *(.rel.fini) }
 126   .rela.fini   ${RELOCATING-0} : { *(.rela.fini)        }
 127   .rel.bss     ${RELOCATING-0} : { *(.rel.bss)          }
 128   .rela.bss    ${RELOCATING-0} : { *(.rela.bss)         }
 129   .rel.plt     ${RELOCATING-0} : { *(.rel.plt)          }
 130   .rela.plt    ${RELOCATING-0} : { *(.rela.plt)         }
 131   .init        ${RELOCATING-0} : { KEEP (*(.init))      } =${NOP-0}
 132   ${DATA_PLT-${PLT}}
 133   .text    ${RELOCATING-0} :
 134   {
 135     ${RELOCATING+${TEXT_START_SYMBOLS}}
 136     *(.text)
 137     ${RELOCATING+*(.text.*)}
 138     *(.stub)
 139     /* .gnu.warning sections are handled specially by elf32.em.  */
 140     *(.gnu.warning)
 141     ${RELOCATING+*(.gnu.linkonce.t*)}
 142     ${RELOCATING+${OTHER_TEXT_SECTIONS}}
 143   } =${NOP-0}
 144   ${RELOCATING+_etext = .;}
 145   ${RELOCATING+PROVIDE (etext = .);}
 146   .fini    ${RELOCATING-0} : { KEEP (*(.fini))          } =${NOP-0}
 147   .rodata  ${RELOCATING-0} :
 148   {
 149     *(.rodata)
 150     ${RELOCATING+*(.rodata.*)}
 151     ${RELOCATING+*(.gnu.linkonce.r*)}
 152   }
 153   .rodata1 ${RELOCATING-0} : { *(.rodata1) }
 154   ${RELOCATING+${OTHER_READONLY_SECTIONS}}
 155
 156   /* Adjust the address for the data segment.  We want to adjust up to
 157      the same address within the page on the next page up.  */
 158   ${CREATE_SHLIB-${RELOCATING+. = ${DATA_ADDR-ALIGN(${MAXPAGESIZE}) + (. & (${MAXPAGESIZE} - 1))};}}
 159   ${CREATE_SHLIB+${RELOCATING+. = ${SHLIB_DATA_ADDR-ALIGN(${MAXPAGESIZE}) + (. & (${MAXPAGESIZE} - 1))};}}
 160
 161   .data  ${RELOCATING-0} :
 162   {
 163     ${RELOCATING+${DATA_START_SYMBOLS}}
 164     *(.data)
 165     ${RELOCATING+*(.data.*)}
 166     ${RELOCATING+*(.gnu.linkonce.d*)}
 167     ${CONSTRUCTING+SORT(CONSTRUCTORS)}
 168   }
 169   .data1 ${RELOCATING-0} : { *(.data1) }
 170   ${RELOCATING+${OTHER_READWRITE_SECTIONS}}
 171   .ctors       ${RELOCATING-0} :
 172   {
 173     ${CONSTRUCTING+${CTOR_START}}
 174     /* gcc uses crtbegin.o to find the start of the constructors, so
 175        we make sure it is first.  Because this is a wildcard, it
 176        doesn't matter if the user does not actually link against
 177        crtbegin.o; the linker won't look for a file to match a
 178        wildcard.  The wildcard also means that it doesn't matter which
 179        directory crtbegin.o is in.  */
 180     KEEP (*crtbegin.o(.ctors))
 181     KEEP (*(SORT(.ctors.*)))
 182     KEEP (*(.ctors))
 183     ${CONSTRUCTING+${CTOR_END}}
 184   }
 185   .dtors       ${RELOCATING-0} :
 186   {
 187     ${CONSTRUCTING+${DTOR_START}}
 188     KEEP (*crtbegin.o(.dtors))
 189     KEEP (*(SORT(.dtors.*)))
 190     KEEP (*(.dtors))
 191     ${CONSTRUCTING+${DTOR_END}}
 192   }
 193   ${DATA_PLT+${PLT}}
 194   ${RELOCATING+${OTHER_GOT_SYMBOLS}}
 195   .got         ${RELOCATING-0} : { *(.got.plt) *(.got) }
 196   ${TEXT_DYNAMIC-${DYNAMIC}}
 197   /* We want the small data sections together, so single-instruction offsets
 198      can access them all, and initialized data all before uninitialized, so
 199      we can shorten the on-disk segment size.  */
 200   .sdata   ${RELOCATING-0} : { *(.sdata) }
 201   ${RELOCATING+${OTHER_GOT_SECTIONS}}
 202   ${RELOCATING+_edata  =  .;}
 203   ${RELOCATING+PROVIDE (edata = .);}
 204   ${RELOCATING+__bss_start = .;}
 205   ${RELOCATING+${OTHER_BSS_SYMBOLS}}
 206   .sbss    ${RELOCATING-0} : { *(.sbss) *(.scommon) }
 207   .bss     ${RELOCATING-0} :
 208   {
 209    *(.dynbss)
 210    *(.bss)
 211    *(COMMON)
 212   }
 213   ${RELOCATING+. = ALIGN(${ALIGNMENT});}
 214   ${RELOCATING+_end = . ;}
 215   ${RELOCATING+PROVIDE (end = .);}
 216
 217   /* Stabs debugging sections.  */
 218   .stab 0 : { *(.stab) }
 219   .stabstr 0 : { *(.stabstr) }
 220   .stab.excl 0 : { *(.stab.excl) }
 221   .stab.exclstr 0 : { *(.stab.exclstr) }
 222   .stab.index 0 : { *(.stab.index) }
 223   .stab.indexstr 0 : { *(.stab.indexstr) }
 224
 225   .comment 0 : { *(.comment) }
 226
 227   /* DWARF debug sections.
 228      Symbols in the DWARF debugging sections are relative to the beginning
 229      of the section so we begin them at 0.  */
 230
 231   /* DWARF 1 */
 232   .debug          0 : { *(.debug) }
 233   .line           0 : { *(.line) }
 234
 235   /* GNU DWARF 1 extensions */
 236   .debug_srcinfo  0 : { *(.debug_srcinfo) }
 237   .debug_sfnames  0 : { *(.debug_sfnames) }
 238
 239   /* DWARF 1.1 and DWARF 2 */
 240   .debug_aranges  0 : { *(.debug_aranges) }
 241   .debug_pubnames 0 : { *(.debug_pubnames) }
 242
 243   /* DWARF 2 */
 244   .debug_info     0 : { *(.debug_info) }
 245   .debug_abbrev   0 : { *(.debug_abbrev) }
 246   .debug_line     0 : { *(.debug_line) }
 247   .debug_frame    0 : { *(.debug_frame) }
 248   .debug_str      0 : { *(.debug_str) }
 249   .debug_loc      0 : { *(.debug_loc) }
 250   .debug_macinfo  0 : { *(.debug_macinfo) }
 251
 252   /* SGI/MIPS DWARF 2 extensions */
 253   .debug_weaknames 0 : { *(.debug_weaknames) }
 254   .debug_funcnames 0 : { *(.debug_funcnames) }
 255   .debug_typenames 0 : { *(.debug_typenames) }
 256   .debug_varnames  0 : { *(.debug_varnames) }
 257
 258   ${RELOCATING+${OTHER_RELOCATING_SECTIONS}}
 259
 260   /* These must appear regardless of ${RELOCATING}.  */
 261   ${OTHER_SECTIONS}
 262 }
 263 EOF