Internal Linker Script

Linux i386 Boot Code HOWTO
Prev |  | Next

# B. Internal Linker Script

Without -T (--script=) option specified, ld will use this builtin script to link targets:

    [root@localhost linux]# ld --verbose
    GNU ld version 2.13.90.0.18 20030206
      Supported emulations:
       elf_i386
       i386linux
    using internal linker script:
    ==================================================
    /* Script for -z combreloc: combine and sort reloc sections */
    OUTPUT_FORMAT("elf32-i386", "elf32-i386",
                  "elf32-i386")
    OUTPUT_ARCH(i386)
    ENTRY(_start)
    SEARCH_DIR("/usr/i386-redhat-linux/lib"); SEARCH_DIR("/usr/lib"); SEARCH_DIR("/u
    sr/local/lib"); SEARCH_DIR("/lib");
    /* Do we need any of these for elf?
       __DYNAMIC = 0;    */
    SECTIONS
    {
      /* Read-only sections, merged into text segment: */
      . = 0x08048000 + SIZEOF_HEADERS;
      .interp         : { *(.interp) }
      .hash           : { *(.hash) }
      .dynsym         : { *(.dynsym) }
      .dynstr         : { *(.dynstr) }
      .gnu.version    : { *(.gnu.version) }
      .gnu.version_d  : { *(.gnu.version_d) }
      .gnu.version_r  : { *(.gnu.version_r) }
      .rel.dyn        :
        {
          *(.rel.init)
          *(.rel.text .rel.text.* .rel.gnu.linkonce.t.*)
          *(.rel.fini)
          *(.rel.rodata .rel.rodata.* .rel.gnu.linkonce.r.*)
          *(.rel.data .rel.data.* .rel.gnu.linkonce.d.*)
          *(.rel.tdata .rel.tdata.* .rel.gnu.linkonce.td.*)
          *(.rel.tbss .rel.tbss.* .rel.gnu.linkonce.tb.*)
          *(.rel.ctors)
          *(.rel.dtors)
          *(.rel.got)
          *(.rel.bss .rel.bss.* .rel.gnu.linkonce.b.*)
        }
      .rela.dyn       :
        {
          *(.rela.init)
          *(.rela.text .rela.text.* .rela.gnu.linkonce.t.*)
          *(.rela.fini)
          *(.rela.rodata .rela.rodata.* .rela.gnu.linkonce.r.*)
          *(.rela.data .rela.data.* .rela.gnu.linkonce.d.*)
          *(.rela.tdata .rela.tdata.* .rela.gnu.linkonce.td.*)
          *(.rela.tbss .rela.tbss.* .rela.gnu.linkonce.tb.*)
          *(.rela.ctors)
          *(.rela.dtors)
          *(.rela.got)
          *(.rela.bss .rela.bss.* .rela.gnu.linkonce.b.*)
        }
      .rel.plt        : { *(.rel.plt) }
      .rela.plt       : { *(.rela.plt) }
      .init           :
      {
        KEEP (*(.init))
      } =0x90909090
      .plt            : { *(.plt) }
      .text           :
      {
        *(.text .stub .text.* .gnu.linkonce.t.*)
        /* .gnu.warning sections are handled specially by elf32.em.  */
        *(.gnu.warning)
      } =0x90909090
      .fini           :
      {
        KEEP (*(.fini))
      } =0x90909090
      PROVIDE (__etext = .);
      PROVIDE (_etext = .);
      PROVIDE (etext = .);
      .rodata         : { *(.rodata .rodata.* .gnu.linkonce.r.*) }
      .rodata1        : { *(.rodata1) }
      .eh_frame_hdr : { *(.eh_frame_hdr) }
      .eh_frame       : ONLY_IF_RO { KEEP (*(.eh_frame)) }
      .gcc_except_table   : ONLY_IF_RO { *(.gcc_except_table) }
      /* Adjust the address for the data segment.  We want to adjust up to
         the same address within the page on the next page up.  */
      . = ALIGN (0x1000) - ((0x1000 - .) & (0x1000 - 1)); . = DATA_SEGMENT_ALIGN (0x
    1000, 0x1000);
      /* For backward-compatibility with tools that don't support the
         *_array_* sections below, our glibc's crt files contain weak
         definitions of symbols that they reference.  We don't want to use
         them, though, unless they're strictly necessary, because they'd
         bring us empty sections, unlike PROVIDE below, so we drop the
         sections from the crt files here.  */
      /DISCARD/ : {
          */crti.o(.init_array .fini_array .preinit_array)
          */crtn.o(.init_array .fini_array .preinit_array)
      }
      /* Ensure the __preinit_array_start label is properly aligned.  We
         could instead move the label definition inside the section, but
         the linker would then create the section even if it turns out to
         be empty, which isn't pretty.  */
      . = ALIGN(32 / 8);
      PROVIDE (__preinit_array_start = .);
      .preinit_array     : { *(.preinit_array) }
      PROVIDE (__preinit_array_end = .);
      PROVIDE (__init_array_start = .);
      .init_array     : { *(.init_array) }
      PROVIDE (__init_array_end = .);
      PROVIDE (__fini_array_start = .);
      .fini_array     : { *(.fini_array) }
      PROVIDE (__fini_array_end = .);
      .data           :
      {
        *(.data .data.* .gnu.linkonce.d.*)
        SORT(CONSTRUCTORS)
      }
      .data1          : { *(.data1) }
      .tdata          : { *(.tdata .tdata.* .gnu.linkonce.td.*) }
      .tbss           : { *(.tbss .tbss.* .gnu.linkonce.tb.*) *(.tcommon) }
      .eh_frame       : ONLY_IF_RW { KEEP (*(.eh_frame)) }
      .gcc_except_table   : ONLY_IF_RW { *(.gcc_except_table) }
      .dynamic        : { *(.dynamic) }
      .ctors          :
      {
        /* gcc uses crtbegin.o to find the start of
           the constructors, so we make sure it is
           first.  Because this is a wildcard, it
           doesn't matter if the user does not
           actually link against crtbegin.o; the
           linker won't look for a file to match a
           wildcard.  The wildcard also means that it
           doesn't matter which directory crtbegin.o
           is in.  */
        KEEP (*crtbegin.o(.ctors))
        /* We don't want to include the .ctor section from
           from the crtend.o file until after the sorted ctors.
           The .ctor section from the crtend file contains the
           end of ctors marker and it must be last */
        KEEP (*(EXCLUDE_FILE (*crtend.o ) .ctors))
        KEEP (*(SORT(.ctors.*)))
        KEEP (*(.ctors))
      }
      .dtors          :
      {
        KEEP (*crtbegin.o(.dtors))
        KEEP (*(EXCLUDE_FILE (*crtend.o ) .dtors))
        KEEP (*(SORT(.dtors.*)))
        KEEP (*(.dtors))
      }
      .jcr            : { KEEP (*(.jcr)) }
      .got            : { *(.got.plt) *(.got) }
      _edata = .;
      PROVIDE (edata = .);
      __bss_start = .;
      .bss            :
      {
       *(.dynbss)
       *(.bss .bss.* .gnu.linkonce.b.*)
       *(COMMON)
       /* Align here to ensure that the .bss section occupies space up to
          _end.  Align after .bss to ensure correct alignment even if the
          .bss section disappears because there are no input sections.  */
       . = ALIGN(32 / 8);
      }
      . = ALIGN(32 / 8);
      _end = .;
      PROVIDE (end = .);
      . = DATA_SEGMENT_END (.);
      /* Stabs debugging sections.  */
      .stab          0 : { *(.stab) }
      .stabstr       0 : { *(.stabstr) }
      .stab.excl     0 : { *(.stab.excl) }
      .stab.exclstr  0 : { *(.stab.exclstr) }
      .stab.index    0 : { *(.stab.index) }
      .stab.indexstr 0 : { *(.stab.indexstr) }
      .comment       0 : { *(.comment) }
      /* DWARF debug sections.
         Symbols in the DWARF debugging sections are relative to the beginning
         of the section so we begin them at 0.  */
      /* DWARF 1 */
      .debug          0 : { *(.debug) }
      .line           0 : { *(.line) }
      /* GNU DWARF 1 extensions */
      .debug_srcinfo  0 : { *(.debug_srcinfo) }
      .debug_sfnames  0 : { *(.debug_sfnames) }
      /* DWARF 1.1 and DWARF 2 */
      .debug_aranges  0 : { *(.debug_aranges) }
      .debug_pubnames 0 : { *(.debug_pubnames) }
      /* DWARF 2 */
      .debug_info     0 : { *(.debug_info .gnu.linkonce.wi.*) }
      .debug_abbrev   0 : { *(.debug_abbrev) }
      .debug_line     0 : { *(.debug_line) }
      .debug_frame    0 : { *(.debug_frame) }
      .debug_str      0 : { *(.debug_str) }
      .debug_loc      0 : { *(.debug_loc) }
      .debug_macinfo  0 : { *(.debug_macinfo) }
      /* SGI/MIPS DWARF 2 extensions */
      .debug_weaknames 0 : { *(.debug_weaknames) }
      .debug_funcnames 0 : { *(.debug_funcnames) }
      .debug_typenames 0 : { *(.debug_typenames) }
      .debug_varnames  0 : { *(.debug_varnames) }
    }

    ==================================================
    [root@localhost linux]#

Prev | Home | Next
Kernel Build Example |  | GRUB and LILO