ld/scripttempl/elfmips.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_READONLY_SECTIONS - other than .text .init .rodata ...
   6 #               (e.g., .PARISC.milli)
   7 #       OTHER_READWRITE_SECTIONS - other than .data .bss .ctors .sdata ...
   8 #               (e.g., .PARISC.global)
   9 #       OTHER_SECTIONS - at the end
  10 #       EXECUTABLE_SYMBOLS - symbols that must be defined for an
  11 #               executable (e.g., _DYNAMIC_LINK)
  12 #       TEXT_START_SYMBOLS - symbols that appear at the start of the
  13 #               .text section.
  14 #       DATA_START_SYMBOLS - symbols that appear at the start of the
  15 #               .data section.
  16 #       OTHER_BSS_SYMBOLS - symbols that appear at the start of the
  17 #               .bss section besides __bss_start.
  18 #       EMBEDDED - whether this is for an embedded system.
  19 #
  20 # When adding sections, do note that the names of some sections are used
  21 # when specifying the start address of the next.
  22 #
  23
  24 # We use a start address of __start for Irix 5, _start for other
  25 # targets.  This is for compatibility with Irix 5, and with old MIPS
  26 # ELF toolchains.
  27 if [ -z "$ENTRY" ]; then
  28   case "${target}" in
  29   mips*-*-irix5*) ENTRY=__start ;;
  30   *) ENTRY=_start ;;
  31   esac
  32 fi
  33
  34 # if this is for an embedded system, don't add SIZEOF_HEADERS.
  35 if [ -z "$EMBEDDED" ]; then
  36    test -z "${TEXT_BASE_ADDRESS}" && TEXT_BASE_ADDRESS="${TEXT_START_ADDR} + SIZEOF_HEADERS"
  37 else
  38    test -z "${TEXT_BASE_ADDRESS}" && TEXT_BASE_ADDRESS="${TEXT_START_ADDR}"
  39 fi
  40
  41 test -z "${BIG_OUTPUT_FORMAT}" && BIG_OUTPUT_FORMAT=${OUTPUT_FORMAT}
  42 test -z "${LITTLE_OUTPUT_FORMAT}" && LITTLE_OUTPUT_FORMAT=${OUTPUT_FORMAT}
  43 test "$LD_FLAG" = "N" && DATA_ADDR=.
  44 INTERP=".interp   ${RELOCATING-0} : { *(.interp)        }"
  45 cat <<EOF
  46 OUTPUT_FORMAT("${OUTPUT_FORMAT}", "${BIG_OUTPUT_FORMAT}",
  47               "${LITTLE_OUTPUT_FORMAT}")
  48 OUTPUT_ARCH(${ARCH})
  49 ENTRY(${ENTRY})
  50
  51 ${RELOCATING+${LIB_SEARCH_DIRS}}
  52 ${RELOCATING+/* Do we need any of these for elf?
  53    __DYNAMIC = 0; ${STACKZERO+${STACKZERO}} ${SHLIB_PATH+${SHLIB_PATH}}  */}
  54 ${RELOCATING+${EXECUTABLE_SYMBOLS}}
  55 ${RELOCATING- /* For some reason, the Solaris linker makes bad executables
  56   if gld -r is used and the intermediate file has sections starting
  57   at non-zero addresses.  Could be a Solaris ld bug, could be a GNU ld
  58   bug.  But for now assigning the zero vmas works.  */}
  59 SECTIONS
  60 {
  61   /* Read-only sections, merged into text segment: */
  62   ${CREATE_SHLIB-${RELOCATING+. = ${TEXT_BASE_ADDRESS};}}
  63   ${CREATE_SHLIB+${RELOCATING+. = ${SHLIB_TEXT_START_ADDR} + SIZEOF_HEADERS;}}
  64   ${CREATE_SHLIB-${INTERP}}
  65   .reginfo     ${RELOCATING-0} : { *(.reginfo) }
  66   .dynamic     ${RELOCATING-0} : { *(.dynamic) }
  67   .dynstr      ${RELOCATING-0} : { *(.dynstr)           }
  68   .dynsym      ${RELOCATING-0} : { *(.dynsym)           }
  69   .hash        ${RELOCATING-0} : { *(.hash)             }
  70   .rel.text    ${RELOCATING-0} : { *(.rel.text)         }
  71   .rela.text   ${RELOCATING-0} : { *(.rela.text)        }
  72   .rel.data    ${RELOCATING-0} : { *(.rel.data)         }
  73   .rela.data   ${RELOCATING-0} : { *(.rela.data)        }
  74   .rel.rodata  ${RELOCATING-0} : { *(.rel.rodata)       }
  75   .rela.rodata ${RELOCATING-0} : { *(.rela.rodata)      }
  76   .rel.got     ${RELOCATING-0} : { *(.rel.got)          }
  77   .rela.got    ${RELOCATING-0} : { *(.rela.got)         }
  78   .rel.ctors   ${RELOCATING-0} : { *(.rel.ctors)        }
  79   .rela.ctors  ${RELOCATING-0} : { *(.rela.ctors)       }
  80   .rel.dtors   ${RELOCATING-0} : { *(.rel.dtors)        }
  81   .rela.dtors  ${RELOCATING-0} : { *(.rela.dtors)       }
  82   .rel.init    ${RELOCATING-0} : { *(.rel.init) }
  83   .rela.init   ${RELOCATING-0} : { *(.rela.init)        }
  84   .rel.fini    ${RELOCATING-0} : { *(.rel.fini) }
  85   .rela.fini   ${RELOCATING-0} : { *(.rela.fini)        }
  86   .rel.bss     ${RELOCATING-0} : { *(.rel.bss)          }
  87   .rela.bss    ${RELOCATING-0} : { *(.rela.bss)         }
  88   .rel.plt     ${RELOCATING-0} : { *(.rel.plt)          }
  89   .rela.plt    ${RELOCATING-0} : { *(.rela.plt)         }
  90   .rodata  ${RELOCATING-0} : { *(.rodata)  }
  91   .rodata1 ${RELOCATING-0} : { *(.rodata1) }
  92   .init        ${RELOCATING-0} : { *(.init)     } =${NOP-0}
  93   .text    ${RELOCATING-0} :
  94   {
  95     ${RELOCATING+${TEXT_START_SYMBOLS}}
  96     *(.text)
  97     *(.stub)
  98     /* .gnu.warning sections are handled specially by elf32.em.  */
  99     *(.gnu.warning)
 100   } =${NOP-0}
 101   ${RELOCATING+_etext = .;}
 102   ${RELOCATING+PROVIDE (etext = .);}
 103   .fini    ${RELOCATING-0} : { *(.fini)    } =${NOP-0}
 104
 105   /* Adjust the address for the data segment.  We want to adjust up to
 106      the same address within the page on the next page up.  It would
 107      be more correct to do this:
 108        ${RELOCATING+. = ${DATA_ADDR-ALIGN(${MAXPAGESIZE})
 109                 + ((ALIGN(8) + ${MAXPAGESIZE} - ALIGN(${MAXPAGESIZE}))
 110                    & (${MAXPAGESIZE} - 1)};}
 111      The current expression does not correctly handle the case of a
 112      text segment ending precisely at the end of a page; it causes the
 113      data segment to skip a page.  The above expression does not have
 114      this problem, but it will currently (2/95) cause BFD to allocate
 115      a single segment, combining both text and data, for this case.
 116      This will prevent the text segment from being shared among
 117      multiple executions of the program; I think that is more
 118      important than losing a page of the virtual address space (note
 119      that no actual memory is lost; the page which is skipped can not
 120      be referenced).  */
 121   ${RELOCATING+. += ${DATA_ADDR} - ${TEXT_START_ADDR};}
 122   ${RELOCATING+. += 0x10000;}
 123   .data  ${RELOCATING-0} :
 124   {
 125     ${RELOCATING+${DATA_START_SYMBOLS}}
 126     *(.data)
 127     ${CONSTRUCTING+CONSTRUCTORS}
 128   }
 129   .data1 ${RELOCATING-0} : { *(.data1) }
 130   .ctors       ${RELOCATING-0} : { *(.ctors)   }
 131   .dtors       ${RELOCATING-0} : { *(.dtors)   }
 132   ${RELOCATING+${OTHER_GOT_SYMBOLS}}
 133   .got         ${RELOCATING-0} :
 134   {
 135     *(.got.plt) *(.got)
 136    }
 137   /* We want the small data sections together, so single-instruction offsets
 138      can access them all, and initialized data all before uninitialized, so
 139      we can shorten the on-disk segment size.  */
 140   .sdata   ${RELOCATING-0} : { *(.sdata) }
 141   ${RELOCATING+${OTHER_READWRITE_SECTIONS}}
 142   ${RELOCATING+_edata  =  .;}
 143   ${RELOCATING+PROVIDE (edata = .);}
 144   ${RELOCATING+__bss_start = .;}
 145   ${RELOCATING+${OTHER_BSS_SYMBOLS}}
 146   .sbss    ${RELOCATING-0} : { *(.sbss) *(.scommon) }
 147   .bss     ${RELOCATING-0} :
 148   {
 149    *(.dynbss)
 150    *(.bss)
 151    *(COMMON)
 152   }
 153   ${RELOCATING+_end = . ;}
 154   ${RELOCATING+PROVIDE (end = .);}
 155
 156   /* These are needed for ELF backends which have not yet been
 157      converted to the new style linker.  */
 158   .stab 0 : { *(.stab) }
 159   .stabstr 0 : { *(.stabstr) }
 160
 161   /* DWARF debug sections.
 162      Symbols in the DWARF debugging sections are relative to the beginning
 163      of the section so we begin them at 0.  */
 164
 165   /* DWARF 1 */
 166   .debug          0 : { *(.debug) }
 167   .line           0 : { *(.line) }
 168
 169   /* GNU DWARF 1 extensions */
 170   .debug_srcinfo  0 : { *(.debug_srcinfo) }
 171   .debug_sfnames  0 : { *(.debug_sfnames) }
 172
 173   /* DWARF 1.1 and DWARF 2 */
 174   .debug_aranges  0 : { *(.debug_aranges) }
 175   .debug_pubnames 0 : { *(.debug_pubnames) }
 176
 177   /* DWARF 2 */
 178   .debug_info     0 : { *(.debug_info) }
 179   .debug_abbrev   0 : { *(.debug_abbrev) }
 180   .debug_line     0 : { *(.debug_line) }
 181   .debug_frame    0 : { *(.debug_frame) }
 182   .debug_str      0 : { *(.debug_str) }
 183   .debug_loc      0 : { *(.debug_loc) }
 184   .debug_macinfo  0 : { *(.debug_macinfo) }
 185
 186   /* SGI/MIPS DWARF 2 extensions */
 187   .debug_weaknames 0 : { *(.debug_weaknames) }
 188   .debug_funcnames 0 : { *(.debug_funcnames) }
 189   .debug_typenames 0 : { *(.debug_typenames) }
 190   .debug_varnames  0 : { *(.debug_varnames) }
 191
 192   /* These must appear regardless of ${RELOCATING}.  */
 193   ${OTHER_SECTIONS}
 194 }
 195 EOF