please explain the following objective disassembly code from a c program line by line:
a.out: file format elf64-x86-64 Disassembly of section .init: 00000000000005e0 <_init>: 5e0: 48 83 ec 08 sub $0x8,%rsp 5e4: 48 8b 05 fd 09 20 00 mov 0x2009fd(%rip),%rax # 200fe8 <__gmon_start__> 5eb: 48 85 c0 test %rax,%rax 5ee: 74 02 je 5f2 <_init+0x12> 5f0: ff d0 callq *%rax 5f2: 48 83 c4 08 add $0x8,%rsp 5f6: c3 retq Disassembly of section .plt: 0000000000000600 <.plt>: 600: ff 35 a2 09 20 00 pushq 0x2009a2(%rip) # 200fa8 <_GLOBAL_OFFSET_TABLE_+0x8> 606: ff 25 a4 09 20 00 jmpq *0x2009a4(%rip) # 200fb0 <_GLOBAL_OFFSET_TABLE_+0x10> 60c: 0f 1f 40 00 nopl 0x0(%rax) 0000000000000610 : 610: ff 25 a2 09 20 00 jmpq *0x2009a2(%rip) # 200fb8 616: 68 00 00 00 00 pushq $0x0 61b: e9 e0 ff ff ff jmpq 600 <.plt> 0000000000000620 <__stack_chk_fail@plt>: 620: ff 25 9a 09 20 00 jmpq *0x20099a(%rip) # 200fc0 <__stack_chk_fail@GLIBC_2.4> 626: 68 01 00 00 00 pushq $0x1 62b: e9 d0 ff ff ff jmpq 600 <.plt> 0000000000000630 : 630: ff 25 92 09 20 00 jmpq *0x200992(%rip) # 200fc8 636: 68 02 00 00 00 pushq $0x2 63b: e9 c0 ff ff ff jmpq 600 <.plt> 0000000000000640 <__isoc99_scanf@plt>: 640: ff 25 8a 09 20 00 jmpq *0x20098a(%rip) # 200fd0 <__isoc99_scanf@GLIBC_2.7> 646: 68 03 00 00 00 pushq $0x3 64b: e9 b0 ff ff ff jmpq 600 <.plt> Disassembly of section .plt.got: 0000000000000650 <__cxa_finalize@plt>: 650: ff 25 a2 09 20 00 jmpq *0x2009a2(%rip) # 200ff8 <__cxa_finalize@GLIBC_2.2.5> 656: 66 90 xchg %ax,%ax Disassembly of section .text: 0000000000000660 <_start>: 660: 31 ed xor %ebp,%ebp 662: 49 89 d1 mov %rdx,%r9 665: 5e pop %rsi 666: 48 89 e2 mov %rsp,%rdx 669: 48 83 e4 f0 and $0xfffffffffffffff0,%rsp 66d: 50 push %rax 66e: 54 push %rsp 66f: 4c 8d 05 4a 02 00 00 lea 0x24a(%rip),%r8 # 8c0 <__libc_csu_fini> 676: 48 8d 0d d3 01 00 00 lea 0x1d3(%rip),%rcx # 850 <__libc_csu_init> 67d: 48 8d 3d e6 00 00 00 lea 0xe6(%rip),%rdi # 76a 684: ff 15 56 09 20 00 callq *0x200956(%rip) # 200fe0 <__libc_start_main@GLIBC_2.2.5> 68a: f4 hlt 68b: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 0000000000000690 : 690: 48 8d 3d 79 09 20 00 lea 0x200979(%rip),%rdi # 201010 <__tmc_end__> 697: 55 push %rbp 698: 48 8d 05 71 09 20 00 lea 0x200971(%rip),%rax # 201010 <__tmc_end__> 69f: 48 39 f8 cmp %rdi,%rax 6a2: 48 89 e5 mov %rsp,%rbp 6a5: 74 19 je 6c0 6a7: 48 8b 05 2a 09 20 00 mov 0x20092a(%rip),%rax # 200fd8 <_itm_deregistertmclonetable> 6ae: 48 85 c0 test %rax,%rax 6b1: 74 0d je 6c0 6b3: 5d pop %rbp 6b4: ff e0 jmpq *%rax 6b6: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) 6bd: 00 00 00 6c0: 5d pop %rbp 6c1: c3 retq 6c2: 0f 1f 40 00 nopl 0x0(%rax) 6c6: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) 6cd: 00 00 00 00000000000006d0 : 6d0: 48 8d 3d 39 09 20 00 lea 0x200939(%rip),%rdi # 201010 <__tmc_end__> 6d7: 48 8d 35 32 09 20 00 lea 0x200932(%rip),%rsi # 201010 <__tmc_end__> 6de: 55 push %rbp 6df: 48 29 fe sub %rdi,%rsi 6e2: 48 89 e5 mov %rsp,%rbp 6e5: 48 c1 fe 03 sar $0x3,%rsi 6e9: 48 89 f0 mov %rsi,%rax 6ec: 48 c1 e8 3f shr $0x3f,%rax 6f0: 48 01 c6 add %rax,%rsi 6f3: 48 d1 fe sar %rsi 6f6: 74 18 je 710 6f8: 48 8b 05 f1 08 20 00 mov 0x2008f1(%rip),%rax # 200ff0 <_itm_registertmclonetable> 6ff: 48 85 c0 test %rax,%rax 702: 74 0c je 710 704: 5d pop %rbp 705: ff e0 jmpq *%rax 707: 66 0f 1f 84 00 00 00 nopw 0x0(%rax,%rax,1) 70e: 00 00 710: 5d pop %rbp 711: c3 retq 712: 0f 1f 40 00 nopl 0x0(%rax) 716: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) 71d: 00 00 00 0000000000000720 <__do_global_dtors_aux>: 720: 80 3d e9 08 20 00 00 cmpb $0x0,0x2008e9(%rip) # 201010 <__tmc_end__> 727: 75 2f jne 758 <__do_global_dtors_aux+0x38> 729: 48 83 3d c7 08 20 00 cmpq $0x0,0x2008c7(%rip) # 200ff8 <__cxa_finalize@GLIBC_2.2.5> 730: 00 731: 55 push %rbp 732: 48 89 e5 mov %rsp,%rbp 735: 74 0c je 743 <__do_global_dtors_aux+0x23> 737: 48 8b 3d ca 08 20 00 mov 0x2008ca(%rip),%rdi # 201008 <__dso_handle> 73e: e8 0d ff ff ff callq 650 <__cxa_finalize@plt> 743: e8 48 ff ff ff callq 690 748: c6 05 c1 08 20 00 01 movb $0x1,0x2008c1(%rip) # 201010 <__tmc_end__> 74f: 5d pop %rbp 750: c3 retq 751: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) 758: f3 c3 repz retq 75a: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1) 0000000000000760 : 760: 55 push %rbp 761: 48 89 e5 mov %rsp,%rbp 764: 5d pop %rbp 765: e9 66 ff ff ff jmpq 6d0 000000000000076a : 76a: 55 push %rbp 76b: 48 89 e5 mov %rsp,%rbp 76e: 48 83 ec 30 sub $0x30,%rsp 772: 89 7d dc mov %edi,-0x24(%rbp) 775: 48 89 75 d0 mov %rsi,-0x30(%rbp) 779: 64 48 8b 04 25 28 00 mov %fs:0x28,%rax 780: 00 00 782: 48 89 45 f8 mov %rax,-0x8(%rbp) 786: 31 c0 xor %eax,%eax 788: 48 8d 3d 49 01 00 00 lea 0x149(%rip),%rdi # 8d8 <_IO_stdin_used+0x8> 78f: b8 00 00 00 00 mov $0x0,%eax 794: e8 97 fe ff ff callq 630 799: 48 8d 45 ec lea -0x14(%rbp),%rax 79d: 48 89 c6 mov %rax,%rsi 7a0: 48 8d 3d 56 01 00 00 lea 0x156(%rip),%rdi # 8fd <_IO_stdin_used+0x2d> 7a7: b8 00 00 00 00 mov $0x0,%eax 7ac: e8 8f fe ff ff callq 640 <__isoc99_scanf@plt> 7b1: 8b 45 ec mov -0x14(%rbp),%eax 7b4: 89 c7 mov %eax,%edi 7b6: e8 7f 00 00 00 callq 83a 7bb: 89 45 f4 mov %eax,-0xc(%rbp) 7be: c7 45 f0 01 00 00 00 movl $0x1,-0x10(%rbp) 7c5: eb 1a jmp 7e1 7c7: 8b 45 f0 mov -0x10(%rbp),%eax 7ca: 89 c6 mov %eax,%esi 7cc: 48 8d 3d 2d 01 00 00 lea 0x12d(%rip),%rdi # 900 <_IO_stdin_used+0x30> 7d3: b8 00 00 00 00 mov $0x0,%eax 7d8: e8 53 fe ff ff callq 630 7dd: 83 45 f0 01 addl $0x1,-0x10(%rbp) 7e1: 8b 45 ec mov -0x14(%rbp),%eax 7e4: 39 45 f0 cmp %eax,-0x10(%rbp) 7e7: 7e de jle 7c7 7e9: bf 0a 00 00 00 mov $0xa,%edi 7ee: e8 1d fe ff ff callq 610 7f3: 8b 45 f4 mov -0xc(%rbp),%eax 7f6: 89 c6 mov %eax,%esi 7f8: 48 8d 3d fe 00 00 00 lea 0xfe(%rip),%rdi # 8fd <_IO_stdin_used+0x2d> 7ff: b8 00 00 00 00 mov $0x0,%eax 804: e8 27 fe ff ff callq 630 809: 8b 45 ec mov -0x14(%rbp),%eax 80c: 89 c6 mov %eax,%esi 80e: 48 8d 3d f0 00 00 00 lea 0xf0(%rip),%rdi # 905 <_IO_stdin_used+0x35> 815: b8 00 00 00 00 mov $0x0,%eax 81a: e8 11 fe ff ff callq 630 81f: b8 00 00 00 00 mov $0x0,%eax 824: 48 8b 55 f8 mov -0x8(%rbp),%rdx 828: 64 48 33 14 25 28 00 xor %fs:0x28,%rdx 82f: 00 00 831: 74 05 je 838 833: e8 e8 fd ff ff callq 620 <__stack_chk_fail@plt> 838: c9 leaveq 839: c3 retq 000000000000083a : 83a: 55 push %rbp 83b: 48 89 e5 mov %rsp,%rbp 83e: 89 7d ec mov %edi,-0x14(%rbp) 841: 8b 45 ec mov -0x14(%rbp),%eax 844: 01 c0 add %eax,%eax 846: 89 45 fc mov %eax,-0x4(%rbp) 849: 8b 45 fc mov -0x4(%rbp),%eax 84c: 5d pop %rbp 84d: c3 retq 84e: 66 90 xchg %ax,%ax 0000000000000850 <__libc_csu_init>: 850: 41 57 push %r15 852: 41 56 push %r14 854: 49 89 d7 mov %rdx,%r15 857: 41 55 push %r13 859: 41 54 push %r12 85b: 4c 8d 25 3e 05 20 00 lea 0x20053e(%rip),%r12 # 200da0 <__frame_dummy_init_array_entry> 862: 55 push %rbp 863: 48 8d 2d 3e 05 20 00 lea 0x20053e(%rip),%rbp # 200da8 <__init_array_end> 86a: 53 push %rbx 86b: 41 89 fd mov %edi,%r13d 86e: 49 89 f6 mov %rsi,%r14 871: 4c 29 e5 sub %r12,%rbp 874: 48 83 ec 08 sub $0x8,%rsp 878: 48 c1 fd 03 sar $0x3,%rbp 87c: e8 5f fd ff ff callq 5e0 <_init> 881: 48 85 ed test %rbp,%rbp 884: 74 20 je 8a6 <__libc_csu_init+0x56> 886: 31 db xor %ebx,%ebx 888: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1) 88f: 00 890: 4c 89 fa mov %r15,%rdx 893: 4c 89 f6 mov %r14,%rsi 896: 44 89 ef mov %r13d,%edi 899: 41 ff 14 dc callq *(%r12,%rbx,8) 89d: 48 83 c3 01 add $0x1,%rbx 8a1: 48 39 dd cmp %rbx,%rbp 8a4: 75 ea jne 890 <__libc_csu_init+0x40> 8a6: 48 83 c4 08 add $0x8,%rsp 8aa: 5b pop %rbx 8ab: 5d pop %rbp 8ac: 41 5c pop %r12 8ae: 41 5d pop %r13 8b0: 41 5e pop %r14 8b2: 41 5f pop %r15 8b4: c3 retq 8b5: 90 nop 8b6: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) 8bd: 00 00 00 00000000000008c0 <__libc_csu_fini>: 8c0: f3 c3 repz retq Disassembly of section .fini: 00000000000008c4 <_fini>: 8c4: 48 83 ec 08 sub $0x8,%rsp 8c8: 48 83 c4 08 add $0x8,%rsp 8cc: c3 retq
