arm-linux-ld的缺省linker script

最新推荐文章于 2023-12-16 16:55:14 发布

转载最新推荐文章于 2023-12-16 16:55:14 发布 · 4.9k 阅读

文章标签：

#linker #wildcard #debugging #alignment #file #output

本文展示了在RedHat系统下执行arm-linux-ld --verbose的输出结果，包含GNU ld版本及支持的仿真类型，重点呈现了内部链接器脚本，脚本中定义了输出格式、架构、入口等信息，还对各段（如.text、.data、.bss等）的布局和属性进行了详细设置。

在RedHat下通过执行 arm-linux-ld --verbose 得到：
GNU ld version 2.11.2 (with BFD 2.11.2)
Supported emulations:
   armelf_linux
   armelf
using internal linker script:
==================================================
OUTPUT_FORMAT("elf32-littlearm", "elf32-bigarm",
       "elf32-littlearm")
OUTPUT_ARCH(arm)
ENTRY(_start)
SEARCH_DIR(/usr/local/arm/2.95.3/arm-linux/lib);
/* Do we need any of these for elf?
   __DYNAMIC = 0;    */
SECTIONS
{
/* Read-only sections, merged into text segment: */
. = 0x00008000 + 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.init      : { *(.rel.init) }
.rela.init     : { *(.rela.init) }
.rel.text      :
    {
      *(.rel.text)
      *(.rel.text.*)
      *(.rel.gnu.linkonce.t.*)
    }
.rela.text     :
    {
      *(.rela.text)
      *(.rela.text.*)
      *(.rela.gnu.linkonce.t.*)
    }
.rel.fini      : { *(.rel.fini) }
.rela.fini     : { *(.rela.fini) }
.rel.rodata    :
    {
      *(.rel.rodata)
      *(.rel.rodata.*)
      *(.rel.gnu.linkonce.r.*)
    }
.rela.rodata   :
    {
      *(.rela.rodata)
      *(.rela.rodata.*)
      *(.rela.gnu.linkonce.r.*)
    }
.rel.data      :
    {
      *(.rel.data)
      *(.rel.data.*)
      *(.rel.gnu.linkonce.d.*)
    }
.rela.data     :
    {
      *(.rela.data)
      *(.rela.data.*)
      *(.rela.gnu.linkonce.d.*)
    }
.rel.ctors     : { *(.rel.ctors) }
.rela.ctors    : { *(.rela.ctors) }
.rel.dtors     : { *(.rel.dtors) }
.rela.dtors    : { *(.rela.dtors) }
.rel.got       : { *(.rel.got)  }
.rela.got      : { *(.rela.got)  }
.rel.sdata     :
    {
      *(.rel.sdata)
      *(.rel.sdata.*)
      *(.rel.gnu.linkonce.s.*)
    }
.rela.sdata     :
    {
      *(.rela.sdata)
      *(.rela.sdata.*)
      *(.rela.gnu.linkonce.s.*)
    }
.rel.sbss      :
    {
      *(.rel.sbss)
      *(.rel.sbss.*)
      *(.rel.gnu.linkonce.sb.*)
    }
.rela.sbss     :
    {
      *(.rela.sbss)
      *(.rela.sbss.*)
      *(.rel.gnu.linkonce.sb.*)
    }
.rel.sdata2    :
    {
      *(.rel.sdata2)
      *(.rel.sdata2.*)
      *(.rel.gnu.linkonce.s2.*)
    }
.rela.sdata2   :
    {
      *(.rela.sdata2)
      *(.rela.sdata2.*)
      *(.rela.gnu.linkonce.s2.*)
    }
.rel.sbss2     :
    {
      *(.rel.sbss2)
      *(.rel.sbss2.*)
      *(.rel.gnu.linkonce.sb2.*)
    }
.rela.sbss2    :
    {
      *(.rela.sbss2)
      *(.rela.sbss2.*)
      *(.rela.gnu.linkonce.sb2.*)
    }
.rel.bss       :
    {
      *(.rel.bss)
      *(.rel.bss.*)
      *(.rel.gnu.linkonce.b.*)
    }
.rela.bss      :
    {
      *(.rela.bss)
      *(.rela.bss.*)
      *(.rela.gnu.linkonce.b.*)
    }
.rel.plt       : { *(.rel.plt)  }
.rela.plt      : { *(.rela.plt)  }
.init          :
{
    KEEP (*(.init))
} =0
.plt      : { *(.plt) }
.text      :
{
    *(.text)
    *(.text.*)
    *(.stub)
    /* .gnu.warning sections are handled specially by elf32.em. */
    *(.gnu.warning)
    *(.gnu.linkonce.t.*)
    *(.glue_7t) *(.glue_7)
} =0
.fini      :
{
    KEEP (*(.fini))
} =0
PROVIDE (__etext = .);
PROVIDE (_etext = .);
PROVIDE (etext = .);
.rodata   : { *(.rodata) *(.rodata.*) *(.gnu.linkonce.r.*) }
.rodata1   : { *(.rodata1) }
.sdata2   : { *(.sdata2) *(.sdata2.*) *(.gnu.linkonce.s2.*) }
.sbss2   : { *(.sbss2) *(.sbss2.*) *(.gnu.linkonce.sb2.*) }
/* 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(0x8000) + (. & (0x8000 - 1));
.data    :
{
    __data_start = . ;
    *(.data)
    *(.data.*)
    *(.gnu.linkonce.d.*)
    SORT(CONSTRUCTORS)
}
.data1   : { *(.data1) }
.eh_frame : { KEEP (*(.eh_frame)) }
.gcc_except_table : { *(.gcc_except_table) }
.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))
}
.got    : { *(.got.plt) *(.got) }
.dynamic       : { *(.dynamic) }
/* We want the small data sections together, so single-instruction offsets
     can access them all, and initialized data all before uninitialized, so
     we can shorten the on-disk segment size. */
.sdata     :
{
    *(.sdata)
    *(.sdata.*)
    *(.gnu.linkonce.s.*)
}
_edata = .;
PROVIDE (edata = .);
__bss_start = .;
__bss_start__ = .;
.sbss      :
{
    PROVIDE (__sbss_start = .);
    PROVIDE (___sbss_start = .);
    *(.dynsbss)
    *(.sbss)
    *(.sbss.*)
    *(.gnu.linkonce.sb.*)
    *(.scommon)
    PROVIDE (__sbss_end = .);
    PROVIDE (___sbss_end = .);
}
.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 = .;
_bss_end__ = . ; __bss_end__ = . ; __end__ = . ;
PROVIDE (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) }
/* These must appear regardless of . */
}

==================================================