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发表于 2008-06-25 23:29 |只看该作者 |倒序浏览

--------------a.c-------------

#include <unistd.h>
#include <string.h>

void a (char *s)
{

write(1,s ,strlen(s));

}

--------------m.c-------------

extern void a (char *);

int main(char ac, char **av)
{

static char string[]="hello world!\n";
a(string);

}

arm-linux-gcc a.c m.c -o a.out

a.o的返汇编代码：
-----------------------a.objdump------------------

a.o:    file format elf32-littlearm

Disassembly of section .text:

00000000 <a>:
0: e1a0c00d mov ip, sp
4: e92dd800 stmdb sp!, {fp, ip, lr, pc}

8: e24cb004 sub fp, ip, #4 ; 0x4
c: e24dd004 sub sp, sp, #4 ; 0x4
  10: e50b0010 str r0, [fp, #-16]
  14: e51b0010 ldr r0, [fp, #-16] //传入函数a的是一个字符串指针，这个指针放在r0中，先要把r0压栈
  18: ebfffffe bl 18 <a+0x18>    //调用strlen
  1c: e1a03000 mov r3, r0          //strlen的返回值放在r3中
  20: e3a00001 mov r0, #1 ; 0x1    // write的第一个参数1放在r0中
  24: e51b1010 ldr r1, [fp, #-16] //字符串的地址放在r1中
  28: e1a02003 mov r2, r3          //字符串的长度放在r2中
  2c: ebfffffe bl 2c <a+0x2c>    //调用write函数

  30: e89da808 ldmia sp, {r3, fp, sp, pc}
Disassembly of section .comment:

00000000 <.comment>:
0: 43434700 cmpmi r3, #0 ; 0x0
4: 4728203a undefined
8: 2029554e eorcs r5, r9, lr, asr #10
c: 2e342e33 mrccs 14, 1, r2, cr4, cr3, {1}
  10: Address 0x10 is out of bounds.

m.o的返汇编代码：
--------------------m.objdump--------------------

m.o:    file format elf32-littlearm

Disassembly of section .text:

00000000 <main>:
0: e1a0c00d mov ip, sp
4: e92dd800 stmdb sp!, {fp, ip, lr, pc}
8: e24cb004 sub fp, ip, #4 ; 0x4

c: e24dd008 sub sp, sp, #8 ; 0x8

  10: e1a03000 mov r3, r0  //char ac 放在r0中
  14: e50b1014 str r1, [fp, #-20] //char **av 放在r1中

  18: e54b300d strb r3, [fp, #-13]
1c: e59f000c ldr r0, [pc, #12] ; 30 <.text+0x30> //这里main调用函数a(char * )  ,传入r0的应该是字符串的地址，可这句话就是不懂！
  20: ebfffffe bl 20 <main+0x20>
  24: e1a00003 mov r0, r3
  28: e24bd00c sub sp, fp, #12 ; 0xc
  2c: e89da800 ldmia sp, {fp, sp, pc}
  30: 00000000 andeq r0, r0, r0
Disassembly of section .data:

00000000 <string.0>:
0: 6c6c6568 cfstr64vs mvdx6, [ip], #-416
4: 6f77206f swivs 0x0077206f
8: 21646c72 cmncs r4, r2, ror ip
c: 0000000a andeq r0, r0, sl
Disassembly of section .comment:

00000000 <.comment>:
0: 43434700 cmpmi r3, #0 ; 0x0
4: 4728203a undefined
8: 2029554e eorcs r5, r9, lr, asr #10
c: 2e342e33 mrccs 14, 1, r2, cr4, cr3, {1}
  10: Address 0x10 is out of bounds.

  18: e54b300d strb r3, [fp, #-13]
  1c: e59f000c ldr r0, [pc, #12] ; 30 <.text+0x30>
  20: ebfffffe bl 20 <main+0x20>
  24: e1a00003 mov r0, r3
  28: e24bd00c sub sp, fp, #12 ; 0xc
  2c: e89da800 ldmia sp, {fp, sp, pc}
  30: 00000000 andeq r0, r0, r0
Disassembly of section .data:

00000000 <string.0>:
0: 6c6c6568 cfstr64vs mvdx6, [ip], #-416
4: 6f77206f swivs 0x0077206f
8: 21646c72 cmncs r4, r2, ror ip
c: 0000000a andeq r0, r0, sl
Disassembly of section .comment:

00000000 <.comment>:
0: 43434700 cmpmi r3, #0 ; 0x0
4: 4728203a undefined
8: 2029554e eorcs r5, r9, lr, asr #10
c: 2e342e33 mrccs 14, 1, r2, cr4, cr3, {1}
  10: Address 0x10 is out of bounds.

[ 本帖最后由 rocky1972 于 2008-6-25 23:34 编辑 ]

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2楼 [报告]

发表于 2008-06-25 23:31 |只看该作者

-------------------------a.out.objdump---------------------

a.out:    file format elf32-littlearm

Disassembly of section .interp://       This section holds the path name of a program interpreter.

000080f4 <.interp>:
80f4: 62696c2f rsbvs r6, r9, #12032 ; 0x2f00
80f8: 2d646c2f stccsl 12, cr6, [r4, #-188]!
80fc: 756e696c strvcb r6, [lr, #-2412]!
8100: 6f732e78 swivs 0x00732e78
8104: Address 0x8104 is out of bounds.

Disassembly of section .note.ABI-tag:

00008108 <.note.ABI-tag>:
8108: 00000004 andeq r0, r0, r4
810c: 00000010 andeq r0, r0, r0, lsl r0
8110: 00000001 andeq r0, r0, r1
8114: 00554e47 subeqs r4, r5, r7, asr #28
8118: 00000000 andeq r0, r0, r0
811c: 00000002 andeq r0, r0, r2
8120: 00000004 andeq r0, r0, r4
8124: 00000003 andeq r0, r0, r3
Disassembly of section .hash:

The .hash section with type SHT_HASH holds a symbol hash table.

00008128 <.hash>:
8128: 00000003 andeq r0, r0, r3
812c: 00000008 andeq r0, r0, r8
8130: 00000007 andeq r0, r0, r7
8134: 00000004 andeq r0, r0, r4
8138: 00000005 andeq r0, r0, r5
...
814c: 00000003 andeq r0, r0, r3
8150: 00000002 andeq r0, r0, r2
8154: 00000001 andeq r0, r0, r1
8158: 00000006 andeq r0, r0, r6
Disassembly of section .dynsym:

      This section holds the dynamic linking symbol table, as "Symbol Table''
      describes. See Chapter 2 for more information.

0000815c <.dynsym>:
...
816c: 00000034 andeq r0, r0, r4, lsr r0
8170: 000082d0 ldreqd r8, [r0], -r0
8174: 00000074 andeq r0, r0, r4, ror r0
8178: 00000012 andeq r0, r0, r2, lsl r0
817c: 0000002e andeq r0, r0, lr, lsr #32
8180: 000082dc ldreqd r8, [r0], -ip
8184: 000001fc streqd r0, [r0], -ip
8188: 00000012 andeq r0, r0, r2, lsl r0
818c: 0000005b andeq r0, r0, fp, asr r0
8190: 000082e8 andeq r8, r0, r8, ror #5
8194: 00000060 andeq r0, r0, r0, rrx
8198: 00000012 andeq r0, r0, r2, lsl r0
819c: 00000049 andeq r0, r0, r9, asr #32
81a0: 000082f4 streqd r8, [r0], -r4
81a4: 00000124 andeq r0, r0, r4, lsr #2
81a8: 00000012 andeq r0, r0, r2, lsl r0
81ac: 0000003a andeq r0, r0, sl, lsr r0
81b0: 00008548 andeq r8, r0, r8, asr #10
81b4: 00000004 andeq r0, r0, r4
81b8: 000e0011 andeq r0, lr, r1, lsl r0
81bc: 00000001 andeq r0, r0, r1
...
81c8: 00000020 andeq r0, r0, r0, lsr #32
81cc: 00000015 andeq r0, r0, r5, lsl r0
...
81d8: 00000020 andeq r0, r0, r0, lsr #32
Disassembly of section .dynstr:

      This section holds strings needed for dynamic linking, most commonly the
      strings that represent the names associated with symbol table entries. See
      Chapter 2 for more information.

000081dc <.dynstr>:
81dc: 764a5f00 strvcb r5, [sl], -r0, lsl #30
81e0: 6765525f undefined
81e4: 65747369 ldrvsb r7, [r4, #-873]!
81e8: 616c4372 cmnvs ip, r2, ror r3
81ec: 73657373 cmnvc r5, #-872415231 ; 0xcc000001
81f0: 675f5f00 ldrvsb r5, [pc, -r0, lsl #30]
81f4: 5f6e6f6d swipl 0x006e6f6d
81f8: 72617473 rsbvc r7, r1, #1929379840 ; 0x73000000
81fc: 005f5f74 subeqs r5, pc, r4, ror pc
8200: 6362696c cmnvs r2, #1769472 ; 0x1b0000
8204: 2e6f732e cdpcs 3, 6, cr7, cr15, cr14, {1}
8208: 62610036 rsbvs r0, r1, #54 ; 0x36
820c: 0074726f rsbeqs r7, r4, pc, ror #4
8210: 74697277 strvcbt r7, [r9], #-631
8214: 495f0065 ldmmidb pc, {r0, r2, r5, r6}^
8218: 74735f4f ldrvcbt r5, [r3], #-3919
821c: 5f6e6964 swipl 0x006e6964
8220: 64657375 strvsbt r7, [r5], #-885
8224: 6c5f5f00 mrrcvs 15, 0, r5, pc, cr0
8228: 5f636269 swipl 0x00636269
822c: 72617473 rsbvc r7, r1, #1929379840 ; 0x73000000
8230: 616d5f74 cmnvs sp, r4, ror pc
8234: 73006e69 tstvc r0, #1680 ; 0x690
8238: 656c7274 strvsb r7, [ip, #-628]!
823c: 4c47006e mcrrmi 0, 6, r0, r7, cr14
8240: 5f434249 swipl 0x00434249
8244: 00302e32 eoreqs r2, r0, r2, lsr lr
Disassembly of section .gnu.version:

00008248 <.gnu.version>:
8248: 00020000 andeq r0, r2, r0
824c: 00020002 andeq r0, r2, r2
8250: 00010002 andeq r0, r1, r2
8254: 00000000 andeq r0, r0, r0
Disassembly of section .gnu.version_r:

00008258 <.gnu.version_r>:
8258: 00010001 andeq r0, r1, r1
825c: 00000024 andeq r0, r0, r4, lsr #32
8260: 00000010 andeq r0, r0, r0, lsl r0
8264: 00000000 andeq r0, r0, r0
8268: 0d696910 stceql 9, cr6, [r9, #-64]!
826c: 00020000 andeq r0, r2, r0
8270: 00000062 andeq r0, r0, r2, rrx
8274: 00000000 andeq r0, r0, r0
Disassembly of section .rel.dyn:

00008278 <.rel.dyn>:
8278: 00010668 andeq r0, r1, r8, ror #12
827c: 00000715 andeq r0, r0, r5, lsl r7
Disassembly of section .rel.plt:

00008280 <.rel.plt>:
8280: 00010654 andeq r0, r1, r4, asr r6
8284: 00000116 andeq r0, r0, r6, lsl r1
8288: 00010658 andeq r0, r1, r8, asr r6
828c: 00000216 andeq r0, r0, r6, lsl r2
8290: 0001065c andeq r0, r1, ip, asr r6
8294: 00000316 andeq r0, r0, r6, lsl r3
8298: 00010660 andeq r0, r1, r0, ror #12
829c: 00000416 andeq r0, r0, r6, lsl r4
82a0: 00010664 andeq r0, r1, r4, ror #12
82a4: 00000616 andeq r0, r0, r6, lsl r6
Disassembly of section .init:

   This section holds executable instructions that contribute to the process
   initialization code. When a program starts to run, the system executes the
   code in this section before calling the main program entry point (called
   main for C programs).

000082a8 <_init>:
82a8: e52de004 str lr, [sp, #-4]!
82ac: eb000024 bl 8344 <call_gmon_start>
82b0: eb000046 bl 83d0 <frame_dummy>
82b4: eb000090 bl 84fc <__do_global_ctors_aux>
82b8: e49df004 ldr pc, [sp], #4
Disassembly of section .plt:

The .got and .plt sections with type SHT_PROGBITS hold two separate tables: the global
offset table and the procedure linkage table. Programs use the global offset table for
position-independent code.

000082bc <.plt>:
82bc: e52de004 str lr, [sp, #-4]!
82c0: e59fe004 ldr lr, [pc, #4] ; 82cc <.plt+0x10>
82c4: e08fe00e add lr, pc, lr
82c8: e5bef008 ldr pc, [lr, #8]!
82cc: 0000837c andeq r8, r0, ip, ror r3
82d0: e28fc600 add ip, pc, #0 ; 0x0
82d4: e28cca08 add ip, ip, #32768 ; 0x8000
82d8: e5bcf37c ldr pc, [ip, #892]!
82dc: e28fc600 add ip, pc, #0 ; 0x0
82e0: e28cca08 add ip, ip, #32768 ; 0x8000
82e4: e5bcf374 ldr pc, [ip, #884]!
82e8: e28fc600 add ip, pc, #0 ; 0x0
82ec: e28cca08 add ip, ip, #32768 ; 0x8000
82f0: e5bcf36c ldr pc, [ip, #876]!
82f4: e28fc600 add ip, pc, #0 ; 0x0
82f8: e28cca08 add ip, ip, #32768 ; 0x8000
82fc: e5bcf364 ldr pc, [ip, #868]!
8300: e28fc600 add ip, pc, #0 ; 0x0
8304: e28cca08 add ip, ip, #32768 ; 0x8000
8308: e5bcf35c ldr pc, [ip, #860]!
Disassembly of section .text:

0000830c <_start>:
830c: e59fc024 ldr ip, [pc, #36] ; 8338 <_start+0x2c>
8310: e3a0b000 mov fp, #0 ; 0x0
8314: e49d1004 ldr r1, [sp], #4
8318: e1a0200d mov r2, sp
831c: e52d2004 str r2, [sp, #-4]!
8320: e52d0004 str r0, [sp, #-4]!
8324: e59f0010 ldr r0, [pc, #16] ; 833c <_start+0x30>
8328: e59f3010 ldr r3, [pc, #16] ; 8340 <_start+0x34>
832c: e52dc004 str ip, [sp, #-4]!
8330: ebffffef bl 82f4 <.text-0x18>
8334: ebffffe8 bl 82dc <.text-0x30>
8338: 000084b4 streqh r8, [r0], -r4
833c: 00008434 andeq r8, r0, r4, lsr r4
8340: 00008468 andeq r8, r0, r8, ror #8

00008344 <call_gmon_start>:
8344: e92d4400 stmdb sp!, {sl, lr}
8348: e59fa01c ldr sl, [pc, #28] ; 836c <.text+0x60>
834c: e08fa00a add sl, pc, sl
8350: e59f3018 ldr r3, [pc, #24] ; 8370 <.text+0x64>
8354: e79a3003 ldr r3, [sl, r3]
8358: e3530000 cmp r3, #0 ; 0x0
835c: 08bd8400 ldmeqia sp!, {sl, pc}
8360: e1a0e00f mov lr, pc
8364: e1a0f003 mov pc, r3
8368: e8bd8400 ldmia sp!, {sl, pc}
836c: 000082f4 streqd r8, [r0], -r4
8370: 00000020 andeq r0, r0, r0, lsr #32

00008374 <__do_global_dtors_aux>:
8374: e92d4030 stmdb sp!, {r4, r5, lr}

8378: e59f5040 ldr r5, [pc, #64] ; 83c0 <.text+0xb4>
837c: e5d53000 ldrb r3, [r5]
8380: e3530000 cmp r3, #0 ; 0x0
8384: 18bd8030 ldmneia sp!, {r4, r5, pc}
8388: e59f4034 ldr r4, [pc, #52] ; 83c4 <.text+0xb8>
838c: ea000004 b 83a4 <__do_global_dtors_aux+0x30>
8390: e5943000 ldr r3, [r4]
8394: e2833004 add r3, r3, #4 ; 0x4
8398: e5843000 str r3, [r4]
839c: e1a0e00f mov lr, pc
83a0: e1a0f002 mov pc, r2
83a4: e5943000 ldr r3, [r4]
83a8: e5932000 ldr r2, [r3]
83ac: e3520000 cmp r2, #0 ; 0x0
83b0: 1afffff6 bne 8390 <__do_global_dtors_aux+0x1c>
83b4: e3a03001 mov r3, #1 ; 0x1
83b8: e5c53000 strb r3, [r5]
83bc: e8bd8030 ldmia sp!, {r4, r5, pc}
83c0: 0001066c andeq r0, r1, ip, ror #12
83c4: 00010554 andeq r0, r1, r4, asr r5

000083c8 <call___do_global_dtors_aux>:
83c8: e52de004 str lr, [sp, #-4]!
83cc: e49df004 ldr pc, [sp], #4

000083d0 <frame_dummy>:
83d0: e59f0018 ldr r0, [pc, #24] ; 83f0 <.text+0xe4>
83d4: e5903000 ldr r3, [r0]
83d8: e3530000 cmp r3, #0 ; 0x0
83dc: 01a0f00e moveq pc, lr
83e0: e59f300c ldr r3, [pc, #12] ; 83f4 <.text+0xe8>
83e4: e3530000 cmp r3, #0 ; 0x0
83e8: 01a0f00e moveq pc, lr
83ec: eaffffc3 b 8300 <.text-0xc>
83f0: 00010644 andeq r0, r1, r4, asr #12
83f4: 00000000 andeq r0, r0, r0

000083f8 <call_frame_dummy>:
83f8: e52de004 str lr, [sp, #-4]!
83fc: e49df004 ldr pc, [sp], #4

00008400 <a>:
8400: e1a0c00d mov ip, sp
8404: e92dd800 stmdb sp!, {fp, ip, lr, pc}
8408: e24cb004 sub fp, ip, #4 ; 0x4
840c: e24dd004 sub sp, sp, #4 ; 0x4
8410: e50b0010 str r0, [fp, #-16]
8414: e51b0010 ldr r0, [fp, #-16]
8418: ebffffb2 bl 82e8 <.text-0x24>
841c: e1a03000 mov r3, r0
8420: e3a00001 mov r0, #1 ; 0x1
8424: e51b1010 ldr r1, [fp, #-16]
8428: e1a02003 mov r2, r3
842c: ebffffa7 bl 82d0 <.text-0x3c>
8430: e89da808 ldmia sp, {r3, fp, sp, pc}

00008434 <main>:
8434: e1a0c00d mov ip, sp
8438: e92dd800 stmdb sp!, {fp, ip, lr, pc}
843c: e24cb004 sub fp, ip, #4 ; 0x4
8440: e24dd008 sub sp, sp, #8 ; 0x8
8444: e1a03000 mov r3, r0
8448: e50b1014 str r1, [fp, #-20]
844c: e54b300d strb r3, [fp, #-13]
8450: e59f000c ldr r0, [pc, #12] ; 8464 <.text+0x158>
8454: ebffffe9 bl 8400 <a> //8400这个地址是00008400 <a>:，这个很容易看懂，就是main调用a的时候pc会调到8400这个位置执行
8458: e1a00003 mov r0, r3
845c: e24bd00c sub sp, fp, #12 ; 0xc
8460: e89da800 ldmia sp, {fp, sp, pc}
8464: 00010558 andeq r0, r1, r8, asr r5

00008468 <__libc_csu_init>:
8468: e92d4070 stmdb sp!, {r4, r5, r6, lr}
846c: ebffff8d bl 82a8 <_init>
8470: e3a04000 mov r4, #0 ; 0x0
8474: e59f3030 ldr r3, [pc, #48] ; 84ac <.text+0x1a0>
8478: e59f2030 ldr r2, [pc, #48] ; 84b0 <.text+0x1a4>
847c: e0623003 rsb r3, r2, r3
8480: e1540143 cmp r4, r3, asr #2
8484: 28bd8070 ldmcsia sp!, {r4, r5, r6, pc}
8488: e1a06002 mov r6, r2
848c: e59f3018 ldr r3, [pc, #24] ; 84ac <.text+0x1a0>
8490: e0625003 rsb r5, r2, r3
8494: e1a0e00f mov lr, pc
8498: e796f104 ldr pc, [r6, r4, lsl #2]
849c: e2844001 add r4, r4, #1 ; 0x1
84a0: e1540145 cmp r4, r5, asr #2
84a4: 3afffffa bcc 8494 <__libc_csu_init+0x2c>
84a8: e8bd8070 ldmia sp!, {r4, r5, r6, pc}
84ac: 0001054c andeq r0, r1, ip, asr #10
84b0: 0001054c andeq r0, r1, ip, asr #10

000084b4 <__libc_csu_fini>:
84b4: e92d4030 stmdb sp!, {r4, r5, lr}
84b8: e59f2034 ldr r2, [pc, #52] ; 84f4 <.text+0x1e8>
84bc: e59f3034 ldr r3, [pc, #52] ; 84f8 <.text+0x1ec>
84c0: e0634002 rsb r4, r3, r2
84c4: e1a04144 mov r4, r4, asr #2
84c8: e2444001 sub r4, r4, #1 ; 0x1
84cc: e3740001 cmn r4, #1 ; 0x1
84d0: 0a000005 beq 84ec <__libc_csu_fini+0x38>
84d4: e1a05003 mov r5, r3
84d8: e1a0e00f mov lr, pc
84dc: e795f104 ldr pc, [r5, r4, lsl #2]
84e0: e2444001 sub r4, r4, #1 ; 0x1
84e4: e3740001 cmn r4, #1 ; 0x1
84e8: 1afffffa bne 84d8 <__libc_csu_fini+0x24>
84ec: eb000012 bl 853c <_fini>
84f0: e8bd8030 ldmia sp!, {r4, r5, pc}
84f4: 0001054c andeq r0, r1, ip, asr #10
84f8: 0001054c andeq r0, r1, ip, asr #10

000084fc <__do_global_ctors_aux>:
84fc: e92d4010 stmdb sp!, {r4, lr}
8500: e59f3028 ldr r3, [pc, #40] ; 8530 <.text+0x224>
8504: e2434004 sub r4, r3, #4 ; 0x4
8508: e5132004 ldr r2, [r3, #-4]
850c: e3720001 cmn r2, #1 ; 0x1
8510: 08bd8010 ldmeqia sp!, {r4, pc}
8514: e1a03002 mov r3, r2
8518: e1a0e00f mov lr, pc
851c: e1a0f003 mov pc, r3
8520: e5343004 ldr r3, [r4, #-4]!
8524: e3730001 cmn r3, #1 ; 0x1
8528: 1afffffa bne 8518 <__do_global_ctors_aux+0x1c>
852c: e8bd8010 ldmia sp!, {r4, pc}
8530: 00010638 andeq r0, r1, r8, lsr r6

00008534 <call___do_global_ctors_aux>:
8534: e52de004 str lr, [sp, #-4]!
8538: e49df004 ldr pc, [sp], #4

Disassembly of section .fini:

   This section holds executable instructions that contribute to the process
   termination code. When a program exits normally, the system executes the
   code in this section.

0000853c <_fini>:
853c: e52de004 str lr, [sp, #-4]!
8540: ebffff8b bl 8374 <__do_global_dtors_aux>
8544: e49df004 ldr pc, [sp], #4
Disassembly of section .rodata:

00008548 <_IO_stdin_used>:
8548: 00020001 andeq r0, r2, r1
Disassembly of section .data:

0001054c <__data_start>:
1054c: 00000000 andeq r0, r0, r0

00010550 <__dso_handle>:
10550: 00000000 andeq r0, r0, r0

00010554 <p.0>:
10554: 00010640 andeq r0, r1, r0, asr #12

00010558 <string.0>:
10558: 6c6c6568 cfstr64vs mvdx6, [ip], #-416
1055c: 6f77206f swivs 0x0077206f
10560: 21646c72 cmncs r4, r2, ror ip
10564: 0000000a andeq r0, r0, sl
Disassembly of section .eh_frame:

00010568 <__FRAME_END__>:
10568: 00000000 andeq r0, r0, r0
Disassembly of section .dynamic:

0001056c <_DYNAMIC>:
1056c: 00000001 andeq r0, r0, r1
10570: 00000024 andeq r0, r0, r4, lsr #32
10574: 0000000c andeq r0, r0, ip
10578: 000082a8 andeq r8, r0, r8, lsr #5
1057c: 0000000d andeq r0, r0, sp
10580: 0000853c andeq r8, r0, ip, lsr r5
10584: 00000004 andeq r0, r0, r4
10588: 00008128 andeq r8, r0, r8, lsr #2
1058c: 00000005 andeq r0, r0, r5
10590: 000081dc ldreqd r8, [r0], -ip
10594: 00000006 andeq r0, r0, r6
10598: 0000815c andeq r8, r0, ip, asr r1
1059c: 0000000a andeq r0, r0, sl
105a0: 0000006c andeq r0, r0, ip, rrx
105a4: 0000000b andeq r0, r0, fp
105a8: 00000010 andeq r0, r0, r0, lsl r0
105ac: 00000015 andeq r0, r0, r5, lsl r0
105b0: 00000000 andeq r0, r0, r0
105b4: 00000003 andeq r0, r0, r3
105b8: 00010648 andeq r0, r1, r8, asr #12
105bc: 00000002 andeq r0, r0, r2
105c0: 00000028 andeq r0, r0, r8, lsr #32
105c4: 00000014 andeq r0, r0, r4, lsl r0
105c8: 00000011 andeq r0, r0, r1, lsl r0
105cc: 00000017 andeq r0, r0, r7, lsl r0
105d0: 00008280 andeq r8, r0, r0, lsl #5
105d4: 00000011 andeq r0, r0, r1, lsl r0
105d8: 00008278 andeq r8, r0, r8, ror r2
105dc: 00000012 andeq r0, r0, r2, lsl r0
105e0: 00000008 andeq r0, r0, r8
105e4: 00000013 andeq r0, r0, r3, lsl r0
105e8: 00000008 andeq r0, r0, r8
105ec: 6ffffffe swivs 0x00fffffe
105f0: 00008258 andeq r8, r0, r8, asr r2
105f4: 6fffffff swivs 0x00ffffff
105f8: 00000001 andeq r0, r0, r1
105fc: 6ffffff0 swivs 0x00fffff0
10600: 00008248 andeq r8, r0, r8, asr #4
...
Disassembly of section .ctors:

00010634 <__CTOR_LIST__>:
10634: ffffffff swinv 0x00ffffff

00010638 <__CTOR_END__>:
10638: 00000000 andeq r0, r0, r0
Disassembly of section .dtors:

0001063c <__DTOR_LIST__>:
1063c: ffffffff swinv 0x00ffffff

00010640 <__DTOR_END__>:
10640: 00000000 andeq r0, r0, r0
Disassembly of section .jcr:

00010644 <__JCR_END__>:
10644: 00000000 andeq r0, r0, r0

Disassembly of section .got:

The .got and .plt sections with type SHT_PROGBITS hold two separate tables: the global
offset table and the procedure linkage table. Programs use the global offset table for
position-independent code.

00010648 <_GLOBAL_OFFSET_TABLE_>:
10648: 0001056c andeq r0, r1, ip, ror #10
...
10654: 000082bc streqh r8, [r0], -ip
10658: 000082bc streqh r8, [r0], -ip
1065c: 000082bc streqh r8, [r0], -ip
10660: 000082bc streqh r8, [r0], -ip
10664: 000082bc streqh r8, [r0], -ip
10668: 00000000 andeq r0, r0, r0
Disassembly of section .bss:

0001066c <completed.1>:
1066c: 00000000 andeq r0, r0, r0
Disassembly of section .comment:

00000000 <.comment>:
0: 43434700 cmpmi r3, #0 ; 0x0
4: 4728203a undefined
8: 2029554e eorcs r5, r9, lr, asr #10
c: 2e342e33 mrccs 14, 1, r2, cr4, cr3, {1}
  10: 47000031 smladxmi r0, r1, r0, r0
  14: 203a4343 eorcss r4, sl, r3, asr #6
  18: 554e4728 strplb r4, [lr, #-1832]
  1c: 2e332029 cdpcs 0, 3, cr2, cr3, cr9, {1}
  20: 00312e34 eoreqs r2, r1, r4, lsr lr
  24: 43434700 cmpmi r3, #0 ; 0x0
  28: 4728203a undefined
  2c: 2029554e eorcs r5, r9, lr, asr #10
  30: 2e342e33 mrccs 14, 1, r2, cr4, cr3, {1}
  34: 47000031 smladxmi r0, r1, r0, r0
  38: 203a4343 eorcss r4, sl, r3, asr #6
  3c: 554e4728 strplb r4, [lr, #-1832]
  40: 2e332029 cdpcs 0, 3, cr2, cr3, cr9, {1}
  44: 00312e34 eoreqs r2, r1, r4, lsr lr
  48: 43434700 cmpmi r3, #0 ; 0x0
  4c: 4728203a undefined
  50: 2029554e eorcs r5, r9, lr, asr #10
  54: 2e342e33 mrccs 14, 1, r2, cr4, cr3, {1}
  58: 47000031 smladxmi r0, r1, r0, r0
  5c: 203a4343 eorcss r4, sl, r3, asr #6
  60: 554e4728 strplb r4, [lr, #-1832]
  64: 2e332029 cdpcs 0, 3, cr2, cr3, cr9, {1}
  68: 00312e34 eoreqs r2, r1, r4, lsr lr
  6c: 43434700 cmpmi r3, #0 ; 0x0
  70: 4728203a undefined
  74: 2029554e eorcs r5, r9, lr, asr #10
  78: 2e342e33 mrccs 14, 1, r2, cr4, cr3, {1}
  7c: 47000031 smladxmi r0, r1, r0, r0
  80: 203a4343 eorcss r4, sl, r3, asr #6
  84: 554e4728 strplb r4, [lr, #-1832]
  88: 2e332029 cdpcs 0, 3, cr2, cr3, cr9, {1}
  8c: 00312e34 eoreqs r2, r1, r4, lsr lr

[ 本帖最后由 rocky1972 于 2008-6-25 23:39 编辑 ]

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3楼 [报告]

发表于 2008-06-25 23:32 |只看该作者

啥意思？

实战分享：从技术角度谈机器学习入门| 【大话IT】RadonDB低门槛向MySQL集群下战书 | ChinaUnix打赏功能已上线！ | 新一代分布式关系型数据库RadonDB知多少？

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4楼 [报告]

发表于 2008-06-25 23:32 |只看该作者

用gcc编译后用strace 查看a.out执行过程的细节：
root@rocky1972-laptop:~/work/c_src# gcc a.c m.c
root@rocky1972-laptop:~/work/c_src# strace ./a.out
execve("./a.out", ["./a.out"], [/* 37 vars */]) = 0
brk(0)                               = 0x804a000
access("/etc/ld.so.nohwcap", F_OK)    = -1 ENOENT (No such file or directory)
mmap2(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7fd7000
access("/etc/ld.so.preload", R_OK)    = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY)    = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=59049, ...}) = 0
mmap2(NULL, 59049, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7fc8000
close(3)                               = 0
access("/etc/ld.so.nohwcap", F_OK)    = -1 ENOENT (No such file or directory)
open("/lib/tls/i686/cmov/libc.so.6", O_RDONLY) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\260e\1"..., 512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size=1364388, ...}) = 0
mmap2(NULL, 1369712, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0xb7e79000
mmap2(0xb7fc2000, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x149) = 0xb7fc2000
mmap2(0xb7fc5000, 9840, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb7fc5000
close(3)                               = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7e78000
set_thread_area({entry_number:-1 -> 6, base_addr:0xb7e786b0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 0
mprotect(0xb7fc2000, 4096, PROT_READ) = 0
munmap(0xb7fc8000, 59049)             = 0
write(1, "hello world!\n", 13hello world!
)       = 13
exit_group(13)                         = ?
Process 6416 detached
root@rocky1972-laptop:~/work/c_src#

实战分享：从技术角度谈机器学习入门| 【大话IT】RadonDB低门槛向MySQL集群下战书 | ChinaUnix打赏功能已上线！ | 新一代分布式关系型数据库RadonDB知多少？

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5楼 [报告]

发表于 2008-06-25 23:41 |只看该作者

原帖由 mik 于 2008-6-25 23:32 发表
啥意思？

小弟不懂程序是怎么编译、连接、执行的，看了elf、连接器和加载器的文档后不是很懂，想从实际代码的角度去理解，把用strace得到的结果和返汇编代码结合起来；
还有elf格式和纯二进制bin文件的转换原理。

请教一个各位大牛们，有没有好的入手方法和资料来理解这些东西。

[ 本帖最后由 rocky1972 于 2008-6-25 23:47 编辑 ]

实战分享：从技术角度谈机器学习入门| 【大话IT】RadonDB低门槛向MySQL集群下战书 | ChinaUnix打赏功能已上线！ | 新一代分布式关系型数据库RadonDB知多少？

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6楼 [报告]

发表于 2008-06-26 11:03 |只看该作者

虚心求教，顶一下。

实战分享：从技术角度谈机器学习入门| 【大话IT】RadonDB低门槛向MySQL集群下战书 | ChinaUnix打赏功能已上线！ | 新一代分布式关系型数据库RadonDB知多少？

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