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Data, Bss Segment »çÀÌÁî º¯È­
±Û¾´ÀÌ: EzDoum ±Û¾´³¯: 2002³â 08¿ù 24ÀÏ ¿ÀÈÄ 02:14





kldp¿¡ ¿Ã¶ó¿Â Áú¹®Àε¥.. Èï¹Ì·Î¿î°Ô À־ Á¦°¡ 
¸î°¡Áö ½ÇÇèÈÄ¿¡ ´ä±ÛÀ» ´Þ¾Ò½À´Ï´Ù.

#include <stdio.h>

int arr_data[1000] = { 0, };
int arr_bss[1000];

int main()
{
        int arr_local1[1000];
        int arr_local2[1000] = { 0, };
        printf("Hello World!\n");

        return 0;
}

À§ÀÇ ¼Ò½ºÀÇ º¯¼öµéÀ» °¢°¢ Ãß°¡Çϸ鼭 size·Î ½ÇÇàÆÄÀÏÀÇ °¢ segmentÀÇ 
Å©±â¸¦ È®ÀÎÇØº¸¾Ò´õ´Ï,
data segmentÀÇ Å©±â´Â 4*1000 + 16¸¸Å­ ´Ã¾î³ª±¸¿ä.
bss segmentÀÇ Å©±â´Â 4*1000 + 8¸¸Å­ ´Ã¾î³ª±¸¿ä.
text segmentÀÇ Å©±â´Â ÃʱâÈ­¾ÈÇÑ °æ¿ì¿¡´Â º¯È­°¡ ¾ø°í,
º¯¼ö¸¦ ÃʱâÈ­Çϸ鼭 ¼±¾ðÇϸé, 8¸¸Å­ ´Ã¾î³³´Ï´Ù.

¿©±â¼­, º¯¼öÅ©±â¿Ü¿¡ ´Ã¾î³­ Å©±â(16, 8, 8)´Â
¾î¶² Á¤º¸°¡ Ãß°¡µÇ±â ¶§¹®¿¡ »ý±â´Â °Ç°¡¿ä??

-----------------------------------------------------------------

µð¾î¼Àºí ÇÏ´Â °ÍÀº gdb¸¦ »ç¿ëÇØµµ µÇ°í
objdump¶õ À¯Æ¿À» »ç¿ëÇØµµ µË´Ï´Ù.

±×·³ Àϵý °¢°¢ÀÇ »óŸ¦ Á¤¸®¸¦ ÇØº¸Áö¿ä..

gcc elf.c -s ÇÏ¸é ¾î¼Àºí¸® ÄÚµå·Î »ý¼º ÇØÁÖ±â´Â Çϴµ¥
½ÇÁ¦ÀûÀ¸·Î ¾î¼Àºí·¯°¡ ¹ÙÀ̳ʸ® Á¤·Ä°°Àº °ÍÀ» Çϴϱî..
±×³É ¹ÙÀ̳ʸ® »óŸ¦ ´ýÇÁÇØº¸´Â°Ô Á¤È®ÇÕ´Ï´Ù.

-----------------------------------------------------------------
//#include <stdio.h>

int arr_data[1000] ;
int arr_bss[1000];

int main()
{
        int arr_local1[1000];
        int arr_local2[1000] ;
//        printf("Hello World!\n");

        return 0;
}

gcc elf.c -o elf

objdump -h elf

Sections: elf init ¾øÀ½                                         
Idx Name          Size      VMA       LMA       File off  Algn  
 11 .text         000000fc  080482f0  080482f0  000002f0  2**4  
                  CONTENTS, ALLOC, LOAD, READONLY, CODE         
 14 .data         0000000c  08049410  08049410  00000410  2**2  
                  CONTENTS, ALLOC, LOAD, DATA                   
 20 .bss          00001f60  08049500  08049500  00000500  2**5  
                  ALLOC                                         

-----------------------------------------------------------------
//#include <stdio.h>

int arr_data[1000] = {0,};
int arr_bss[1000];

int main()
{
        int arr_local1[1000];
        int arr_local2[1000] ={0,} ;
//        printf("Hello World!\n");

        return 0;
}

gcc elf2.c -o elf2

objdump -h elf2

Sections: elf2 init ÀÖÀ½                    
Idx Name          Size      VMA       LMA       File off  Algn
 11 .text         0000010c  080482f0  080482f0  000002f0  2**4
                  CONTENTS, ALLOC, LOAD, READONLY, CODE       
 14 .data         00000fc0  08049420  08049420  00000420  2**5
                  CONTENTS, ALLOC, LOAD, DATA                 
 20 .bss          00000fc0  0804a4c0  0804a4c0  000014c0  2**5
                  ALLOC                                       

-----------------------------------------------------------------
elf, elf2ÀÇ »çÀÌÁî ºñ±³
                  elf                      elf2             
Idx Name          Size           Algn      Size             Algn
 11 .text         000000fc(252)  2**4      0000010c(268)    2**4
 14 .data         0000000c(12)   2**2      00000fc0(4032)   2**5
 20 .bss          00001f60(8032) 2**5      00000fc0(4032)   2**5

Àϵý main¿¡¼­ ¾à°£ÀÇ ÄÚµå Â÷À̰¡ ³ª´Âµ¥
¹ÙÀ̳ʸ®¸¦ ´ýÇÁÇØºÃ½À´Ï´Ù. objdump -s elf
ÀÌ·±½ÄÀ¸·Î ÇϸéµÇ´Âµ¥...

¾Æ·¡¸¦ º¸½Ã¸é ¾Ë°ÚÁö¸¸,
ÃʱâÈ­ ·çƾ ¶§¹®¿¡ Á¶±Ý Â÷À̰¡ ÀÖ½À´Ï´Ù.
Áï elf.c°°Àº °æ¿ì¿£ ½ºÅÿ¡ °ø°£À» Àâ¾ÆµÎ°í 
	(80483a3:       81 ec 40 1f 00 00       sub    $0x1f40,%esp)
¹Ù·Î »ç¿ëÀ» ÇÏÁö¸¸

elf2.cÀÇ °æ¿ì¿£ elf.c¿Í °°ÀÌ ½ºÅÿ¡ ÀÚ¸®¸¦ Àâ¾ÆÁÖ°í
¾Æ·¡¿Í °°ÀÌ Å¬¸®¾îÇØÁÖ´Â ÀÛ¾÷À» ÇÕ´Ï´Ù.

	80483b0:       31 c0                   xor    %eax,%eax            
	80483b2:       fc                      cld
	80483b3:       b9 e8 03 00 00          mov    $0x3e8,%ecx
	80483b8:       f3 ab                   repz stos %eax,%es:(%edi)

·¹Áö½ºÅÍ eax¸¦ 0À¸·Î ¸¸µç´ÙÀ½ 
Ç÷¡±×¸¦ ¸®¼ÂÇϰí
ecx¿¡ ¹Ýº¹ÇÒ È½¼ö (4000)¸¦ ÁöÁ¤Çϰí
eaxÀÇ °ªÀ» %es:(%edi)¿¡ Àü¼ÛÇÏ´Â °ÅÁÒ..
repz¸í·É¾î¿¡ ÀÇÇØ¼­ ecx´Â Çϳª¾¿ ÁÙ°í,, edi´Â Çϳª¾¿ Áõ°¡Çϴϱî
°á°úÀûÀ¸·Î´Â ½ºÅÿ¡ ÀÚ¸®ÀâÀº arr_local2°¡ 0À¸·Î Ŭ¸®¾î µÇ°ÚÁö¿ä..

¿©±â¼­ ÇѰ¡Áö Áý°í ³Ñ¾î°¥ »çÇ×ÀÌ Àִµ¥,
¸¸¾à¿¡ arr_data¸¦ 0ÀÌ ¾Æ´Ñ ƯÁ¤ ´Ù¸¥ µ¥ÀÌÅÍ·Î ÃʱâÈ­ ÇÑ´Ù¸é
arr_local2[1024] = {1,2,3,4,5,6};
ÀÌ ³»¿ëÀ¸ rdata ¼¼±×¸ÕÆ®¿¡ ÀúÀåÀÌ µÇ°í
Áö±Ýó·³ ½ºÆ®¸µÀÏ 0 ¹Ð¾î¹ö¸®´Â°Ô ¾Æ´Ï¶ó... 
¸Þ¸ð¸® Ä«ÇÇÇÏ´Â ¾î¼Àºí¸®°¡ Ãß°¡µË´Ï´Ù.

±×·³ ±Û·Î¹ú¿¡ ÀÖ´Â arr_data´Â ¾î¶³±î¿ä?
À̰͵µ ÃʱâÈ­ ÇÏ´Â ·çƾÀÌ ÀÖÀ»±î¿ä?
¿ä°ÍÀº Àß »ý°¢Çغ¸¸é ±×·²Çʿ䰡 ¾ø½À´Ï´Ù.
arr_data´Â ±Û·Î¹ú µ¥ÀÌÅÍ·Î., ÄÄÆÄÀÏ Å¸ÀÓ¶§ ¹Ì¸® ±× °ªÀÌ Á¤ÇØÁ®¼­
¹ÙÀ̳ʸ®¿¡ ÀÖ´Â ³»¿ëÀÌ ±×´ë·Î ¸Þ¸ð¸®·Î ¿Ã¶ó°¡´Ï±î
ÃʱâÈ­ ·çƾÀÌ ÇÊ¿ä ¾ø´Â°ÍÀÌÁÒ..

±×·³ °á·ÐÀûÀ¸·Î »çÀÌÁî Â÷ÀÌ´Â ¿Ö »ý°åÀ»±î¿ä?
¹Ù·Î... ÀÌ ÃʱâÈ­ ÇÏ´Â ·çƾ¶§¹®¿¡ Äڵ尡 ´õ Ãß°¡ µÇ¾ú±â ¶§¹®ÀÌÁÒ..
±×·±µ¥ º¸±âÁÁ°Ô 16À̶õ °ªÀ¸·Î Â÷À̰¡ ³ª´Â°É±î¿ä?
±×°ÍÀº... ¼¼±×¸ÕÆ®°¡ È¿À²ÀûÀÎ Á¢±ÙÀ» À§Çؼ­ ƯÁ¤ ¹ÙÀÌÆ®·Î Á¤·ÄÀÌ
µÇ±â ¶§¹®ÀÔ´Ï´Ù.
Áï elf2´Â 000000fc ÄÚµå»çÀÌÁîÀÇ ÀӰ踦 ³Ñ¾î¹ö·Á¼­
´ÙÀ½ ÀÓ°èÁ¡ÀÎ 0000010c±îÁö »çÀÌÁî°¡ Áõ°¡ÇØ ¹ö¸°°ÍÀÌÁö¿ä..

ÀÌÁ¦ ±×·³ ¾Æ·¡Ç¥¿¡¼­ ¿Ö Algn°ªÀ» Âï¾ú´ÂÁö ¾Ë°ÚÁö¿ä?
Idx Name          Size           Algn      Size             Algn
 11 .text         000000fc(252)  2**4      0000010c(268)    2**4
 14 .data         0000000c(12)   2**2      00000fc0(4032)   2**5
 20 .bss          00001f60(8032) 2**5      00000fc0(4032)   2**5

ÀÚ ¾Æ·¡´Â main functionÀÇ ¾î¼Àºí¸® ÀÚ·áÀÔ´Ï´Ù.
 
080483a0 <main>: elf
 80483a0:       55                      push   %ebp
 80483a1:       89 e5                   mov    %esp,%ebp
 80483a3:       81 ec 40 1f 00 00       sub    $0x1f40,%esp
 80483a9:       31 c0                   xor    %eax,%eax
 80483ab:       eb 03                   jmp    80483b0 <main+0x10>
 80483ad:       8d 76 00                lea    0x0(%esi),%esi
 80483b0:       c9                      leave
 80483b1:       c3                      ret
 80483b2:       90                      nop
 80483b3:       90                      nop
 80483b4:       90                      nop
 80483b5:       90                      nop
 80483b6:       90                      nop
 80483b7:       90                      nop
 80483b8:       90                      nop
 80483b9:       90                      nop
 80483ba:       90                      nop
 80483bb:       90                      nop
 80483bc:       90                      nop
 80483bd:       90                      nop
 80483be:       90                      nop
 80483bf:       90                      nop

080483a0 <main>: elf2
 80483a0:       55                      push   %ebp
 80483a1:       89 e5                   mov    %esp,%ebp
 80483a3:       81 ec 40 1f 00 00       sub    $0x1f40,%esp
 80483a9:       57                      push   %edi
 80483aa:       8d bd c0 e0 ff ff       lea    0xffffe0c0(%ebp),%edi
 80483b0:       31 c0                   xor    %eax,%eax
 80483b2:       fc                      cld
 80483b3:       b9 e8 03 00 00          mov    $0x3e8,%ecx
 80483b8:       f3 ab                   repz stos %eax,%es:(%edi)
 80483ba:       31 c0                   xor    %eax,%eax
 80483bc:       eb 02                   jmp    80483c0 <main+0x20>
 80483be:       89 f6                   mov    %esi,%esi
 80483c0:       8b bd bc e0 ff ff       mov    0xffffe0bc(%ebp),%edi
 80483c6:       c9                      leave
 80483c7:       c3                      ret
 80483c8:       90                      nop
 80483c9:       90                      nop
 80483ca:       90                      nop
 80483cb:       90                      nop
 80483cc:       90                      nop
 80483cd:       90                      nop
 80483ce:       90                      nop
 80483cf:       90                      nop
 
 
ÀÚ ±×·³ data´Â 8ÀÌ Â÷À̰¡ ³­´Ù°í Çߴµ¥
Á¦°¡ ½ÇÇèÀ» ÇØº¸´Ï±î. Àú´Â 20ÀÌ Â÷À̰¡ ³ª³×¿ä..
À½.. ÀÌ°Í ¿ª½Ã Á¤·Ä¶§¹®ÀÔ´Ï´Ù.

¾Æ·¡ÀÇ ´ýÇÁ³»¿ªÀ» º¸¸é, elf´Â ¾à°£ÀÇ µ¥ÀÌÅÍ ¿µ¿ªÀÌ
4¹ÙÀÌÆ® ´ÜÀ§·Î Á¤·ÄÀÌ µÇ¾î¼­... 12¹ÙÀÌÆ®·Î Á¸À縦 ÇÕ´Ï´Ù.
ÇÏÁö¸¸,,

elf2ÀÇ °æ¿ì¿£ 12 + 4000 Àε¥. À̰ÍÀÌ 4000À» ³Ñ¾î¹ö·¯¼­
´ÙÀ½ ÀÓ°èÁ¡Àº 4032±îÁö Ä¿Á®¹ö¸°°ÅÁÒ..(elf2ÀÇ µ¥ÀÌÅÍ Á¤·ÄÀº 2^5)
 
Contents of section .data: elf
 8049410 00000000 2c940408 00000000           ....,.......


Contents of section .data: elf2
 8049420 00000000 f0a30408 00000000 00000000  ................
 8049430 00000000 00000000 00000000 00000000  ................
 8049440 00000000 00000000 00000000 00000000  ................
 8049450 00000000 00000000 00000000 00000000  ................
 8049460 00000000 00000000 00000000 00000000  ................
 8049470 00000000 00000000 00000000 00000000  ................
 8049480 00000000 00000000 00000000 00000000  ................
 8049490 00000000 00000000 00000000 00000000  ................

 ....
 

 804a380 00000000 00000000 00000000 00000000  ................
 804a390 00000000 00000000 00000000 00000000  ................
 804a3a0 00000000 00000000 00000000 00000000  ................
 804a3b0 00000000 00000000 00000000 00000000  ................
 804a3c0 00000000 00000000 00000000 00000000  ................
 804a3d0 00000000 00000000 00000000 00000000  ................

elf2¿¡¼­ ÀÏÁ¾ÀÇ filler°¡  ¾îµð¿¡ µé¾î°¬À»±î¿ä?
±×°ÍÀ» ¾Ë¾Æº¸±â À§Çؼ­ main¿¡ Äڵ带 ¾à°£ Ãß°¡Çß½À´Ï´Ù,
´Ü ¿©±â¼­ ÁÖÀÇÇÒ »çÇ×Àº Äڵ尡 Á¤·ÄÀ» À§Çؼ­ ³²°ÜµÐ
¿©ºÐº¸´Ù Ä¿Á®¹ö¸®¸é Àüü Äڵ尡 Áõ°¡ÇØ ¹ö¸®´Ï
Àý´ë°ª ºñ±³°¡ ¾ÈµË´Ï´Ù...

//#include <stdio.h>

int arr_data[1000] = {0,};
int arr_bss[1000];

int main()
{
        int arr_local1[1000];
        int arr_local2[1000] ={0,} ;
        arr_data[0] = 1;
//        printf("Hello World!\n");

        return 0;
}

080483a0 <main>:
 80483a0:       55                      push   %ebp
 80483a1:       89 e5                   mov    %esp,%ebp
 80483a3:       81 ec 40 1f 00 00       sub    $0x1f40,%esp
 80483a9:       57                      push   %edi
 80483aa:       8d bd c0 e0 ff ff       lea    0xffffe0c0(%ebp),%edi
 80483b0:       31 c0                   xor    %eax,%eax
 80483b2:       fc                      cld
 80483b3:       b9 e8 03 00 00          mov    $0x3e8,%ecx
 80483b8:       f3 ab                   repz stos %eax,%es:(%edi)
 80483ba:       c7 05 40 94 04 08 01    movl   $0x1,0x8049440
 80483c1:       00 00 00
 80483c4:       31 c0                   xor    %eax,%eax
 80483c6:       eb 00                   jmp    80483c8 <main+0x28>
 80483c8:       8b bd bc e0 ff ff       mov    0xffffe0bc(%ebp),%edi
 80483ce:       c9                      leave
 80483cf:       c3                      ret

ÀÚ.. ´äÀÌ ³ª¿Ô³×¿ä.

 80483ba:       c7 05 40 94 04 08 01    movl   $0x1,0x8049440
 
º¸½Ã¸é ¾Ë°ÚÁö¸¸. elf¶§ ÀÖ´ø 12¹ÙÀÌÆ® µÚ¸¦ 20¹ÙÀÌÆ® 0À¸·Î ±ò°í
±×´ÙÀ½ ºÎÅÍ 0x8049440ÁÖ¿í ¿¬¼ÓµÈ °ø°£À» ÇÒ´çÇÏ°Ô µË´Ï´Ù.

 
Á¦ ½ÇÇè¿¡¼­´Â bss´Â Á¦°¡ ¿øÇÏ´Â Å©±â ¸¸Å­ µ¿ÀÏÇÑ »çÀÌÁî·Î ÁÙ¾ú³×¿ä..

À½... º¸½Ã°í ´Ù½Ã Àß ÀÌÇØ°¡ ¾ÈµÇ¸é Áú¹®ÇØÁÖ¼¼¿ä..
´öºÐ¿¡... Àúµµ ¿¾³¯¿¡ ¹è¿î°Å º¹½Àµµ Çϰí Á¤¸®µµ Çϰí ÁÁ³×¿ä. ^^

ps. 
¾Æ ÇѰ¡Áö Ãß°¡.. ÀÚ·á°¡ Ä¿Á³À»¶§ 32·Î Á¤·ÄÇϴ°ÍÀº ¹«¾ù ¶§¹®Àϱî¿ä? 
¤»¤» 

±×°Ç ¾Æ¸¶µµ ij½¬¶û ¿¬°üÀÌ Å¬²®´Ï´Ù. 
Á¦°¡ gcc¼Ò½º¸¦ ºÐ¼®ÇØ º¸Áö´Â ¾Ê¾ÒÁö¸¸.. 
Á¦°¡ ÄÄÆÄÀÏÇÑ È¯°æÀÇ cpu´Â ´ÙÀ½°ú °°Àº ij½¬¶óÀÎÀ» °¡Áö°í Àְŵç¿ä 

TLB and cache info: 
01: Instruction TLB: 4KB pages, 4-way set assoc, 32 entries 
02: Instruction TLB: 4MB pages, 4-way set assoc, 2 entries 
03: Data TLB: 4KB pages, 4-way set assoc, 64 entries 
43: 2nd-level cache: 512KB, 4-way set assoc, 32 byte line size 
08: 1st-level instruction cache: 16KB, 4-way set assoc, 32 byte line size 
04: Data TLB: 4MB pages, 4-way set assoc, 8 entries 
0c: 1st-level data cache: 16KB, 4-way set assoc, 32 byte line size 

±×·¡¼­ ij½¬¶óÀο¡ °ÉÄ¡Áö ¸»¶ó°í Àú·¸°Ô ÇØÁִ°Š°°³×¿ä..


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