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 #       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 #       DATA_PLT - .plt should be in data segment, not text segment.
  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 test -z "$ENTRY" && ENTRY=_start
  24 test -z "${BIG_OUTPUT_FORMAT}" && BIG_OUTPUT_FORMAT=${OUTPUT_FORMAT}
  25 test -z "${LITTLE_OUTPUT_FORMAT}" && LITTLE_OUTPUT_FORMAT=${OUTPUT_FORMAT}
  26 test "$LD_FLAG" = "N" && DATA_ADDR=.
  27 INTERP=".interp   ${RELOCATING-0} : { *(.interp)        }"
  28 PLT=".plt    ${RELOCATING-0} : { *(.plt)        }"
  29 cat <<EOF
  30 OUTPUT_FORMAT("${OUTPUT_FORMAT}", "${BIG_OUTPUT_FORMAT}",
  31               "${LITTLE_OUTPUT_FORMAT}")
  32 OUTPUT_ARCH(${ARCH})
  33 ENTRY(${ENTRY})
  34
  35 ${RELOCATING+${LIB_SEARCH_DIRS}}
  36 ${RELOCATING+/* Do we need any of these for elf?
  37    __DYNAMIC = 0; ${STACKZERO+${STACKZERO}} ${SHLIB_PATH+${SHLIB_PATH}}  */}
  38 ${RELOCATING+${EXECUTABLE_SYMBOLS}}
  39 ${RELOCATING- /* For some reason, the Solaris linker makes bad executables
  40   if gld -r is used and the intermediate file has sections starting
  41   at non-zero addresses.  Could be a Solaris ld bug, could be a GNU ld
  42   bug.  But for now assigning the zero vmas works.  */}
  43 SECTIONS
  44 {
  45   /* Read-only sections, merged into text segment: */
  46   ${CREATE_SHLIB-${RELOCATING+. = ${TEXT_START_ADDR} + SIZEOF_HEADERS;}}
  47   ${CREATE_SHLIB+${RELOCATING+. = SIZEOF_HEADERS;}}
  48   ${CREATE_SHLIB-${INTERP}}
  49   .hash        ${RELOCATING-0} : { *(.hash)             }
  50   .dynsym      ${RELOCATING-0} : { *(.dynsym)           }
  51   .dynstr      ${RELOCATING-0} : { *(.dynstr)           }
  52   .rel.text    ${RELOCATING-0} : { *(.rel.text)         }
  53   .rela.text   ${RELOCATING-0} : { *(.rela.text)        }
  54   .rel.data    ${RELOCATING-0} : { *(.rel.data)         }
  55   .rela.data   ${RELOCATING-0} : { *(.rela.data)        }
  56   .rel.rodata  ${RELOCATING-0} : { *(.rel.rodata)       }
  57   .rela.rodata ${RELOCATING-0} : { *(.rela.rodata)      }
  58   .rel.got     ${RELOCATING-0} : { *(.rel.got)          }
  59   .rela.got    ${RELOCATING-0} : { *(.rela.got)         }
  60   .rel.ctors   ${RELOCATING-0} : { *(.rel.ctors)        }
  61   .rela.ctors  ${RELOCATING-0} : { *(.rela.ctors)       }
  62   .rel.dtors   ${RELOCATING-0} : { *(.rel.dtors)        }
  63   .rela.dtors  ${RELOCATING-0} : { *(.rela.dtors)       }
  64   .rel.init    ${RELOCATING-0} : { *(.rel.init) }
  65   .rela.init   ${RELOCATING-0} : { *(.rela.init)        }
  66   .rel.fini    ${RELOCATING-0} : { *(.rel.fini) }
  67   .rela.fini   ${RELOCATING-0} : { *(.rela.fini)        }
  68   .rel.bss     ${RELOCATING-0} : { *(.rel.bss)          }
  69   .rela.bss    ${RELOCATING-0} : { *(.rela.bss)         }
  70   .rel.plt     ${RELOCATING-0} : { *(.rel.plt)          }
  71   .rela.plt    ${RELOCATING-0} : { *(.rela.plt)         }
  72   .init        ${RELOCATING-0} : { *(.init)     } =${NOP-0}
  73   ${DATA_PLT-${PLT}}
  74   .text    ${RELOCATING-0} :
  75   {
  76     ${RELOCATING+${TEXT_START_SYMBOLS}}
  77     *(.text)
  78     /* .gnu.warning sections are handled specially by elf32.em.  */
  79     *(.gnu.warning)
  80   } =${NOP-0}
  81   ${RELOCATING+_etext = .;}
  82   ${RELOCATING+PROVIDE (etext = .);}
  83   .fini    ${RELOCATING-0} : { *(.fini)    } =${NOP-0}
  84   .rodata  ${RELOCATING-0} : { *(.rodata)  }
  85   .rodata1 ${RELOCATING-0} : { *(.rodata1) }
  86   ${RELOCATING+${OTHER_READONLY_SECTIONS}}
  87
  88   /* Read-write section, merged into data segment: */
  89   ${RELOCATING+. = ${DATA_ADDR- ALIGN(8) + ${MAXPAGESIZE}};}
  90   .data  ${RELOCATING-0} :
  91   {
  92     ${RELOCATING+${DATA_START_SYMBOLS}}
  93     *(.data)
  94     ${CONSTRUCTING+CONSTRUCTORS}
  95   }
  96   .data1 ${RELOCATING-0} : { *(.data1) }
  97   ${RELOCATING+${OTHER_READWRITE_SECTIONS}}
  98   .ctors       ${RELOCATING-0} : { *(.ctors)   }
  99   .dtors       ${RELOCATING-0} : { *(.dtors)   }
 100   .got         ${RELOCATING-0} : { *(.got.plt) *(.got) }
 101   .dynamic     ${RELOCATING-0} : { *(.dynamic) }
 102   ${DATA_PLT+${PLT}}
 103   /* We want the small data sections together, so single-instruction offsets
 104      can access them all, and initialized data all before uninitialized, so
 105      we can shorten the on-disk segment size.  */
 106   .sdata   ${RELOCATING-0} : { *(.sdata) }
 107   ${RELOCATING+_edata  =  .;}
 108   ${RELOCATING+PROVIDE (edata = .);}
 109   ${RELOCATING+__bss_start = .;}
 110   ${RELOCATING+${OTHER_BSS_SYMBOLS}}
 111   .sbss    ${RELOCATING-0} : { *(.sbss) *(.scommon) }
 112   .bss     ${RELOCATING-0} :
 113   {
 114    *(.dynbss)
 115    *(.bss)
 116    *(COMMON)
 117   }
 118   ${RELOCATING+_end = . ;}
 119   ${RELOCATING+PROVIDE (end = .);}
 120
 121   /* These are needed for ELF backends which have not yet been
 122      converted to the new style linker.  */
 123   .stab 0 : { *(.stab) }
 124   .stabstr 0 : { *(.stabstr) }
 125
 126   /* These must appear regardless of ${RELOCATING}.  */
 127   ${OTHER_SECTIONS}
 128 }
 129 EOF