#include <stdio.h>
int main() {
int a = 1;
int b = 2;
printf("%d",a+b);
return 0;
}编译下
gcc main.c -save-temps -o main[vagrant@10 01]$ cat main.s
.file "main.c"
.section .rodata
.LC0:
.string "%d"
.text
.globl main
.type main, @function
main:
.LFB0:
.cfi_startproc
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
movq %rsp, %rbp
.cfi_def_cfa_register 6
subq $16, %rsp
movl $1, -4(%rbp)
movl $2, -8(%rbp)
movl -8(%rbp), %eax
movl -4(%rbp), %edx
addl %edx, %eax
movl %eax, %esi
movl $.LC0, %edi
movl $0, %eax
call printf
movl $0, %eax
leave
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE0:
.size main, .-main
.ident "GCC: (GNU) 4.8.5 20150623 (Red Hat 4.8.5-36)"
.section .note.GNU-stack,"",@progbitsobjdump -d main.o反汇编
[vagrant@10 01]$ objdump -d main.o
main.o： 文件格式 elf64-x86-64
Disassembly of section .text:
0000000000000000 <main>:
0: 55 push %rbp
1: 48 89 e5 mov %rsp,%rbp
4: 48 83 ec 10 sub $0x10,%rsp
8: c7 45 fc 01 00 00 00 movl $0x1,-0x4(%rbp)
f: c7 45 f8 02 00 00 00 movl $0x2,-0x8(%rbp)
16: 8b 45 f8 mov -0x8(%rbp),%eax
19: 8b 55 fc mov -0x4(%rbp),%edx
1c: 01 d0 add %edx,%eax
1e: 89 c6 mov %eax,%esi
20: bf 00 00 00 00 mov $0x0,%edi
25: b8 00 00 00 00 mov $0x0,%eax
2a: e8 00 00 00 00 callq 2f <main+0x2f>
2f: b8 00 00 00 00 mov $0x0,%eax
34: c9 leaveq
35: c3 retqobjdump -d main[vagrant@10 01]$ objdump -d main
main： 文件格式 elf64-x86-64
Disassembly of section .init:
00000000004003e0 <_init>:
4003e0: 48 83 ec 08 sub $0x8,%rsp
4003e4: 48 8b 05 0d 0c 20 00 mov 0x200c0d(%rip),%rax # 600ff8 <_DYNAMIC+0x1d0>
4003eb: 48 85 c0 test %rax,%rax
4003ee: 74 05 je 4003f5 <_init+0x15>
4003f0: e8 3b 00 00 00 callq 400430 <__gmon_start__@plt>
4003f5: 48 83 c4 08 add $0x8,%rsp
4003f9: c3 retq
Disassembly of section .plt:
0000000000400400 <printf@plt-0x10>:
400400: ff 35 02 0c 20 00 pushq 0x200c02(%rip) # 601008 <_GLOBAL_OFFSET_TABLE_+0x8>
400406: ff 25 04 0c 20 00 jmpq *0x200c04(%rip) # 601010 <_GLOBAL_OFFSET_TABLE_+0x10>
40040c: 0f 1f 40 00 nopl 0x0(%rax)
0000000000400410 <printf@plt>:
400410: ff 25 02 0c 20 00 jmpq *0x200c02(%rip) # 601018 <_GLOBAL_OFFSET_TABLE_+0x18>
400416: 68 00 00 00 00 pushq $0x0
40041b: e9 e0 ff ff ff jmpq 400400 <_init+0x20>
0000000000400420 <__libc_start_main@plt>:
400420: ff 25 fa 0b 20 00 jmpq *0x200bfa(%rip) # 601020 <_GLOBAL_OFFSET_TABLE_+0x20>
400426: 68 01 00 00 00 pushq $0x1
40042b: e9 d0 ff ff ff jmpq 400400 <_init+0x20>
0000000000400430 <__gmon_start__@plt>:
400430: ff 25 f2 0b 20 00 jmpq *0x200bf2(%rip) # 601028 <_GLOBAL_OFFSET_TABLE_+0x28>
400436: 68 02 00 00 00 pushq $0x2
40043b: e9 c0 ff ff ff jmpq 400400 <_init+0x20>
Disassembly of section .text:
0000000000400440 <_start>:
400440: 31 ed xor %ebp,%ebp
400442: 49 89 d1 mov %rdx,%r9
400445: 5e pop %rsi
400446: 48 89 e2 mov %rsp,%rdx
400449: 48 83 e4 f0 and $0xfffffffffffffff0,%rsp
40044d: 50 push %rax
40044e: 54 push %rsp
40044f: 49 c7 c0 e0 05 40 00 mov $0x4005e0,%r8
400456: 48 c7 c1 70 05 40 00 mov $0x400570,%rcx
40045d: 48 c7 c7 2d 05 40 00 mov $0x40052d,%rdi
400464: e8 b7 ff ff ff callq 400420 <__libc_start_main@plt>
400469: f4 hlt
40046a: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1)
0000000000400470 <deregister_tm_clones>:
400470: b8 3f 10 60 00 mov $0x60103f,%eax
400475: 55 push %rbp
400476: 48 2d 38 10 60 00 sub $0x601038,%rax
40047c: 48 83 f8 0e cmp $0xe,%rax
400480: 48 89 e5 mov %rsp,%rbp
400483: 77 02 ja 400487 <deregister_tm_clones+0x17>
400485: 5d pop %rbp
400486: c3 retq
400487: b8 00 00 00 00 mov $0x0,%eax
40048c: 48 85 c0 test %rax,%rax
40048f: 74 f4 je 400485 <deregister_tm_clones+0x15>
400491: 5d pop %rbp
400492: bf 38 10 60 00 mov $0x601038,%edi
400497: ff e0 jmpq *%rax
400499: 0f 1f 80 00 00 00 00 nopl 0x0(%rax)
00000000004004a0 <register_tm_clones>:
4004a0: b8 38 10 60 00 mov $0x601038,%eax
4004a5: 55 push %rbp
4004a6: 48 2d 38 10 60 00 sub $0x601038,%rax
4004ac: 48 c1 f8 03 sar $0x3,%rax
4004b0: 48 89 e5 mov %rsp,%rbp
4004b3: 48 89 c2 mov %rax,%rdx
4004b6: 48 c1 ea 3f shr $0x3f,%rdx
4004ba: 48 01 d0 add %rdx,%rax
4004bd: 48 d1 f8 sar %rax
4004c0: 75 02 jne 4004c4 <register_tm_clones+0x24>
4004c2: 5d pop %rbp
4004c3: c3 retq
4004c4: ba 00 00 00 00 mov $0x0,%edx
4004c9: 48 85 d2 test %rdx,%rdx
4004cc: 74 f4 je 4004c2 <register_tm_clones+0x22>
4004ce: 5d pop %rbp
4004cf: 48 89 c6 mov %rax,%rsi
4004d2: bf 38 10 60 00 mov $0x601038,%edi
4004d7: ff e2 jmpq *%rdx
4004d9: 0f 1f 80 00 00 00 00 nopl 0x0(%rax)
00000000004004e0 <__do_global_dtors_aux>:
4004e0: 80 3d 4d 0b 20 00 00 cmpb $0x0,0x200b4d(%rip) # 601034 <_edata>
4004e7: 75 11 jne 4004fa <__do_global_dtors_aux+0x1a>
4004e9: 55 push %rbp
4004ea: 48 89 e5 mov %rsp,%rbp
4004ed: e8 7e ff ff ff callq 400470 <deregister_tm_clones>
4004f2: 5d pop %rbp
4004f3: c6 05 3a 0b 20 00 01 movb $0x1,0x200b3a(%rip) # 601034 <_edata>
4004fa: f3 c3 repz retq
4004fc: 0f 1f 40 00 nopl 0x0(%rax)
0000000000400500 <frame_dummy>:
400500: 48 83 3d 18 09 20 00 cmpq $0x0,0x200918(%rip) # 600e20 <__JCR_END__>
400507: 00
400508: 74 1e je 400528 <frame_dummy+0x28>
40050a: b8 00 00 00 00 mov $0x0,%eax
40050f: 48 85 c0 test %rax,%rax
400512: 74 14 je 400528 <frame_dummy+0x28>
400514: 55 push %rbp
400515: bf 20 0e 60 00 mov $0x600e20,%edi
40051a: 48 89 e5 mov %rsp,%rbp
40051d: ff d0 callq *%rax
40051f: 5d pop %rbp
400520: e9 7b ff ff ff jmpq 4004a0 <register_tm_clones>
400525: 0f 1f 00 nopl (%rax)
400528: e9 73 ff ff ff jmpq 4004a0 <register_tm_clones>
000000000040052d <main>:
40052d: 55 push %rbp
40052e: 48 89 e5 mov %rsp,%rbp
400531: 48 83 ec 10 sub $0x10,%rsp
400535: c7 45 fc 01 00 00 00 movl $0x1,-0x4(%rbp)
40053c: c7 45 f8 02 00 00 00 movl $0x2,-0x8(%rbp)
400543: 8b 45 f8 mov -0x8(%rbp),%eax
400546: 8b 55 fc mov -0x4(%rbp),%edx
400549: 01 d0 add %edx,%eax
40054b: 89 c6 mov %eax,%esi
40054d: bf 00 06 40 00 mov $0x400600,%edi
400552: b8 00 00 00 00 mov $0x0,%eax
400557: e8 b4 fe ff ff callq 400410 <printf@plt>
40055c: b8 00 00 00 00 mov $0x0,%eax
400561: c9 leaveq
400562: c3 retq
400563: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1)
40056a: 00 00 00
40056d: 0f 1f 00 nopl (%rax)
0000000000400570 <__libc_csu_init>:
400570: 41 57 push %r15
400572: 41 89 ff mov %edi,%r15d
400575: 41 56 push %r14
400577: 49 89 f6 mov %rsi,%r14
40057a: 41 55 push %r13
40057c: 49 89 d5 mov %rdx,%r13
40057f: 41 54 push %r12
400581: 4c 8d 25 88 08 20 00 lea 0x200888(%rip),%r12 # 600e10 <__frame_dummy_init_array_entry>
400588: 55 push %rbp
400589: 48 8d 2d 88 08 20 00 lea 0x200888(%rip),%rbp # 600e18 <__init_array_end>
400590: 53 push %rbx
400591: 4c 29 e5 sub %r12,%rbp
400594: 31 db xor %ebx,%ebx
400596: 48 c1 fd 03 sar $0x3,%rbp
40059a: 48 83 ec 08 sub $0x8,%rsp
40059e: e8 3d fe ff ff callq 4003e0 <_init>
4005a3: 48 85 ed test %rbp,%rbp
4005a6: 74 1e je 4005c6 <__libc_csu_init+0x56>
4005a8: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1)
4005af: 00
4005b0: 4c 89 ea mov %r13,%rdx
4005b3: 4c 89 f6 mov %r14,%rsi
4005b6: 44 89 ff mov %r15d,%edi
4005b9: 41 ff 14 dc callq *(%r12,%rbx,8)
4005bd: 48 83 c3 01 add $0x1,%rbx
4005c1: 48 39 eb cmp %rbp,%rbx
4005c4: 75 ea jne 4005b0 <__libc_csu_init+0x40>
4005c6: 48 83 c4 08 add $0x8,%rsp
4005ca: 5b pop %rbx
4005cb: 5d pop %rbp
4005cc: 41 5c pop %r12
4005ce: 41 5d pop %r13
4005d0: 41 5e pop %r14
4005d2: 41 5f pop %r15
4005d4: c3 retq
4005d5: 90 nop
4005d6: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1)
4005dd: 00 00 00
00000000004005e0 <__libc_csu_fini>:
4005e0: f3 c3 repz retq
Disassembly of section .fini:
00000000004005e4 <_fini>:
4005e4: 48 83 ec 08 sub $0x8,%rsp
4005e8: 48 83 c4 08 add $0x8,%rsp
4005ec: c3 retq