如何使用链接器将main放在第一个图像中

时间:2015-11-08 16:36:23

标签: c++ class linker main

现在,我创建了一个用C ++编写的新操作系统。

我想将main函数放在图像的第一个位置,但我不能。

如果我不使用课程,那么主要是第一个。

如果我使用类,则该类位于图像的第一个位置。

Disassembly of section .text:

00010200 <_ZN4test4initEv>:
_ZN4test4initEv():
/home/xaliver/WorkSpace/kOdin/kernel32/./test.hpp:11
public:
    void init(void);
};

void test::init(void)
{
   10200:   55                      push   %ebp 
   10201:   89 e5                   mov    %esp,%ebp
/home/xaliver/WorkSpace/kOdin/kernel32/./test.hpp:12
    m = 10;
   10203:   8b 45 08                mov    0x8(%ebp),%eax
   10206:   c7 00 0a 00 00 00       movl   $0xa,(%eax)
/home/xaliver/WorkSpace/kOdin/kernel32/./test.hpp:14

    return;
   1020c:   90                      nop
/home/xaliver/WorkSpace/kOdin/kernel32/./test.hpp:15
}
   1020d:   5d                      pop    %ebp 
   1020e:   c3                      ret    

0001020f <main>:
main():
/home/xaliver/WorkSpace/kOdin/kernel32/./main.cpp:10
bool kPrintString(int iX, int iY, const char* pcString);
bool kInitializeKernel64Area(void);
bool kIsMemoryEnough(void);

void main(void)
{
   1020f:   55                      push   %ebp 
   10210:   89 e5                   mov    %esp,%ebp
   10212:   83 e4 f0                and    $0xfffffff0,%esp

我使用这个链接器脚本。 0x10200是第一个位置

/* Default linker script, for normal executables */
OUTPUT_FORMAT("elf32-i386", "elf32-i386",
          "elf32-i386")
OUTPUT_ARCH(i386)
ENTRY(_start)
SEARCH_DIR("/home/xaliver/BuildTools/cross/x86_64-pc-linux/lib");
SECTIONS
{
  /* Read-only sections, merged into text segment: */
  PROVIDE (__executable_start = SEGMENT_START("text-segment", 0x08048000)); . = SEGMENT_START("text-segment", 0x08048000) + SIZEOF_HEADERS;

  /* DS Start */
  /* Part moved to the front by section relocation */
  .text 0x10200   :
  {
    main.o(.text)
    *(.text .stub .text.* .gnu.linkonce.t.*)
    /* .gnu.warning sections are handled specially by elf32.em */
    *(.gnu.warning)
  } =0x90909090

  .rodata         : { *(.rodata .rodata.* .gnu.linkonce.r.*) }
  .rodata1        : { *(.rodata1) }

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  . = ALIGN (512);  /* Next .data will be located at aligned address by 512 byte */

  .data           :
  {
    *(.data .data.* .gnu.linkonce.d.*)
    SORT(CONSTRUCTORS)
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  . = .;
  __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.
      FIXME: Why do we need it? When there is no .bss section, we don't
      pad the .data section.  */
   . = ALIGN(. != 0 ? 32 / 8 : 1);
  }
  . = ALIGN(32 / 8);
  . = SEGMENT_START("ldata-segment", .);
  . = ALIGN(32 / 8);
  _end = .; PROVIDE (end = .);
  /* DS End */

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      PROVIDE_HIDDEN (__rel_iplt_start = .);
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      PROVIDE_HIDDEN (__rel_iplt_end = .);
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  .init           :
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    KEEP (*(SORT_NONE(.init)))
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  .plt            : { *(.plt) *(.iplt) }
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    *(.text.exit .text.exit.*)
    *(.text.startup .text.startup.*)
    *(.text.hot .text.hot.*)
    *(.text .stub .text.* .gnu.linkonce.t.*)
    /* .gnu.warning sections are handled specially by elf32.em.  */
    *(.gnu.warning)
  }
  .fini           :
  {
    KEEP (*(SORT_NONE(.fini)))
  }
  PROVIDE (__etext = .);
  PROVIDE (_etext = .);
  PROVIDE (etext = .);
  .preinit_array     :
  {
    PROVIDE_HIDDEN (__preinit_array_start = .);
    KEEP (*(.preinit_array))
    PROVIDE_HIDDEN (__preinit_array_end = .);
  }
  .init_array     :
  {
    PROVIDE_HIDDEN (__init_array_start = .);
    KEEP (*(SORT(.init_array.*)))
    KEEP (*(.init_array ))
    PROVIDE_HIDDEN (__init_array_end = .);
  }
  .fini_array     :
  {
    PROVIDE_HIDDEN (__fini_array_start = .);
    KEEP (*(SORT(.fini_array.*)))
    KEEP (*(.fini_array ))
    PROVIDE_HIDDEN (__fini_array_end = .);
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  .tdata      : { *(.tdata .tdata.* .gnu.linkonce.td.*) }
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       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
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       is in.  */
    KEEP (*crtbegin.o(.ctors))
    KEEP (*crtbegin?.o(.ctors))
    /* We don't want to include the .ctor section from
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       The .ctor section from the crtend file contains the
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    KEEP (*(.ctors))
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  //. = DATA_SEGMENT_RELRO_END (SIZEOF (.got.plt) >= 12 ? 12 : 0, .);
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  .eh_frame_hdr : { *(.eh_frame_hdr) }
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}

如何在第一个位置设置主页?

0 个答案:

没有答案