【原创】objdump 的使用

objdump 是用来查看目标文件或者可执行的目标文件的构成的 GCC 工具。

objdump - display information from object files.

objdump -x obj 以某种分类信息的形式把目标文件的数据组织（被分为几大块）输出。
===================
-x
--all-headers
Display all available header information, including the symbol table and relocation entries. Using -x is equivalent to specifying all of -a -f -h -p -r -t.
===================

objdump -t obj 输出目标文件的符号表。
===================
-t
--syms
Print the symbol table entries of the file. This is similar to the information provided by the nm program.
===================
比 nm -s 包含的符号表信息更全面。

objdump -h obj 输出目标文件的所有段概括。
===================
-h
--section-headers
--headers
Display summary information from the section headers of the object file.

File segments may be relocated to nonstandard addresses, for example by using the -Ttext, -Tdata, or -Tbss options to ld. However, some object file formats, such as a.out, do not store the starting address of the file segments. In those situations, although ld relocates the sections correctly, using objdump -h to list the file section headers cannot show the correct addresses. Instead, it shows the usual addresses, which are implicit for the target.
===================

objdump -j .text/.data -S obj 输出指定段的信息。
===================
-j name
--section=name
Display information only for section name.
===================

===================
-S
--source
Display source code intermixed with disassembly, if possible. Implies -d.

--source
-S 尽可能反汇编出源代码，尤其当编译的时候指定了 -g 这种调试参数时效果比较明显。
隐含了 -d 参数。
===================

===================
-d
--disassemble
Display the assembler mnemonics for the machine instructions from objfile. This option only disassembles
those sections which are expected to contain instructions.

--disassemble
-d 仅反汇编应该包含指令机器码的 section 。
===================

===================
-D
--disassemble-all
Like -d, but disassemble the contents of all sections, not just those expected to contain instructions.

--disassemble-all
-D 与 -d 类似，但反汇编所有 section 。
===================

objdump -a obj 输出 .a 文件中 .o 文件的信息。
===================
-a
--archive-header
If any of the objfile files are archives, display the archive header information (in a format similar to ls
-l). Besides the information you could list with ar tv, objdump -a shows the object file format of each archive member.
===================
比 ar tv 只多了文件格式信息（也是查看静态库文件中包含的二进制文件为 32bit 或 64bit 的方法）。

===================
-l
--line-numbers
Label the display (using debugging information) with the filename and source line numbers corresponding to the object code or relocs shown. Only useful with -d, -D, or -r.

--line-numbers
-l 用文件名和行号标注相应的目标代码，仅仅和 -d、-D 或者 -r 一起使用。使用 -ld 和使用 -d 的区别不是很大，在源码级调试的时候有用，要求编译时使用了 -g 之类的调试编译选项。
===================

===================
--prefix-addresses
When disassembling, print the complete address on each line. This is the older disassembly format.

--prefix-addresses
反汇编的时候，显示每一行的完整地址。这是一种比较老的反汇编格式。
显示效果并不理想，但可能会用到其中的某些显示，自己可以对比。
===================

===================
--show-raw-insn
When disassembling instructions, print the instruction in hex as well as in symbolic form. This is the default except when --prefix-addresses is used.

--show-raw-insn
反汇编的时候，显示每条汇编指令对应的十六进制机器码，这是缺省选项，除非指定了 --prefix-addresses 。
===================

===================
--no-show-raw-insn
When disassembling instructions, do not print the instruction bytes. This is the default when --pre- fix-addresses is used.

--no-show-raw-insn
反汇编时，不显示汇编指令的十六进制机器码，这是指定 --prefix-addresses 选项时的缺省设置。
===================

示例一：以 libevent.a 进行演示。

[root@Betty lib]# pwd

/usr/local/lib

[root@Betty lib]# ll libevent.a

-rw-r--r-- 1 root root 635122 Jul 8 13:53 libevent.a

查看 libevent.a 中包含哪些 .o 文件（权限+格式）。

[root@Betty lib]# objdump -a libevent.a

In archive libevent.a:

event.o: file format elf64-x86-64

rwxrwSrwx 0/0 58760 Jul 8 13:52 2013 event.o

buffer.o: file format elf64-x86-64

rwxrwSrwx 0/0 24168 Jul 8 13:52 2013 buffer.o

evbuffer.o: file format elf64-x86-64

rwxrwSrwx 0/0 28656 Jul 8 13:52 2013 evbuffer.o

log.o: file format elf64-x86-64

rwxrwSrwx 0/0 14392 Jul 8 13:52 2013 log.o

evutil.o: file format elf64-x86-64

rwxrwSrwx 0/0 11920 Jul 8 13:52 2013 evutil.o

event_tagging.o: file format elf64-x86-64

rwxrwSrwx 0/0 30368 Jul 8 13:52 2013 event_tagging.o

http.o: file format elf64-x86-64

rwxrwSrwx 0/0 169040 Jul 8 13:52 2013 http.o

evdns.o: file format elf64-x86-64

rwxrwSrwx 0/0 150064 Jul 8 13:52 2013 evdns.o

evrpc.o: file format elf64-x86-64

rwxrwSrwx 0/0 44912 Jul 8 13:52 2013 evrpc.o

strlcpy.o: file format elf64-x86-64

rwxrwSrwx 0/0 4216 Jul 8 13:52 2013 strlcpy.o

select.o: file format elf64-x86-64

rwxrwSrwx 0/0 22056 Jul 8 13:52 2013 select.o

poll.o: file format elf64-x86-64

rwxrwSrwx 0/0 21832 Jul 8 13:52 2013 poll.o

epoll.o: file format elf64-x86-64

rwxrwSrwx 0/0 23560 Jul 8 13:52 2013 epoll.o

signal.o: file format elf64-x86-64

rwxrwSrwx 0/0 25888 Jul 8 13:52 2013 signal.o

[root@Betty lib]#

作为对比，提供 ar 命令输出结果。

ar - create, modify, and extract from archives
===================
t Display a table listing the contents of archive, or those of the files listed in member... that are present
in the archive. Normally only the member name is shown; if you also want to see the modes (permissions), timestamp, owner, group, and size, you can request that by also specifying the v modifier.

If you do not specify a member, all files in the archive are listed.

If there is more than one file with the same name (say, fie) in an archive (say b.a), ar t b.a fie lists
only the first instance; to see them all, you must ask for a complete listing---in our example, ar t b.a.
===================

[root@Betty lib]# ar tv libevent.a

rwxrwSrwx 0/0 58760 Jul 8 13:52 2013 event.o

rwxrwSrwx 0/0 24168 Jul 8 13:52 2013 buffer.o

rwxrwSrwx 0/0 28656 Jul 8 13:52 2013 evbuffer.o

rwxrwSrwx 0/0 14392 Jul 8 13:52 2013 log.o

rwxrwSrwx 0/0 11920 Jul 8 13:52 2013 evutil.o

rwxrwSrwx 0/0 30368 Jul 8 13:52 2013 event_tagging.o

rwxrwSrwx 0/0 169040 Jul 8 13:52 2013 http.o

rwxrwSrwx 0/0 150064 Jul 8 13:52 2013 evdns.o

rwxrwSrwx 0/0 44912 Jul 8 13:52 2013 evrpc.o

rwxrwSrwx 0/0 4216 Jul 8 13:52 2013 strlcpy.o

rwxrwSrwx 0/0 22056 Jul 8 13:52 2013 select.o

rwxrwSrwx 0/0 21832 Jul 8 13:52 2013 poll.o

rwxrwSrwx 0/0 23560 Jul 8 13:52 2013 epoll.o

rwxrwSrwx 0/0 25888 Jul 8 13:52 2013 signal.o

[root@Betty lib]#

输出 .a 中全部 .o 文件中的符号表信息。

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[root@Betty lib]# objdump -t libevent.a

In archive libevent.a:

event.o: file format elf64-x86-64

SYMBOL TABLE:

0000000000000000 l df *ABS* 0000000000000000 event.c

0000000000000000 l d .text 0000000000000000 .text

0000000000000000 l d .data 0000000000000000 .data

0000000000000000 l d .bss 0000000000000000 .bss

0000000000000000 l d .debug_abbrev 0000000000000000 .debug_abbrev

0000000000000000 l d .debug_info 0000000000000000 .debug_info

0000000000000000 l d .debug_line 0000000000000000 .debug_line

0000000000000000 l F .text 0000000000000008 event_loopexit_cb

0000000000000000 l d .rodata.str1.1 0000000000000000 .rodata.str1.1

0000000000000070 l O .rodata 0000000000000016 __PRETTY_FUNCTION__.5067

0000000000000140 l F .text 000000000000008b gettime

0000000000000008 l O .bss 0000000000000004 use_monotonic

00000000000002d0 l F .text 000000000000001d event_once_cb

0000000000000090 l O .rodata 0000000000000019 __func__.4992

0000000000000000 l d .rodata.str1.8 0000000000000000 .rodata.str1.8

00000000000000e0 l O .rodata 0000000000000020 eventops

0000000000000100 l O .rodata 000000000000000f __func__.4892

0000000000000590 l F .text 0000000000000357 event_queue_remove

0000000000000020 l O .rodata 0000000000000013 __func__.5403

0000000000000013 l O .rodata 000000000000000a __PRETTY_FUNCTION__.5306

00000000000000c0 l O .rodata 0000000000000010 __PRETTY_FUNCTION__.4915

00000000000000a9 l O .rodata 000000000000000d __func__.4961

0000000000000d30 l F .text 0000000000000213 event_queue_insert

0000000000000000 l O .rodata 0000000000000013 __func__.5437

000000000000003d l O .rodata 000000000000000d __PRETTY_FUNCTION__.5336

0000000000000050 l O .rodata 0000000000000015 __PRETTY_FUNCTION__.5026

0000000000000033 l O .rodata 000000000000000a __PRETTY_FUNCTION__.5266

0000000000000000 l d .rodata 0000000000000000 .rodata

0000000000000000 l d .debug_frame 0000000000000000 .debug_frame

0000000000000000 l d .eh_frame 0000000000000000 .eh_frame

0000000000000000 l d .debug_loc 0000000000000000 .debug_loc

0000000000000000 l d .debug_pubnames 0000000000000000 .debug_pubnames

0000000000000000 l d .debug_aranges 0000000000000000 .debug_aranges

0000000000000000 l d .debug_ranges 0000000000000000 .debug_ranges

0000000000000000 l d .debug_str 0000000000000000 .debug_str

0000000000000000 l d .note.GNU-stack 0000000000000000 .note.GNU-stack

0000000000000000 l d .comment 0000000000000000 .comment

0000000000000010 g F .text 0000000000000015 event_base_loopbreak

0000000000000030 g F .text 000000000000000c event_loopbreak

0000000000000000 g O .bss 0000000000000008 current_base

0000000000000040 g F .text 000000000000005a event_set

00000000000000a0 g F .text 0000000000000026 event_base_set

00000000000000d0 g F .text 000000000000001f event_priority_set

00000000000000f0 g F .text 0000000000000006 event_get_version

0000000000000100 g F .text 000000000000000e event_get_method

0000000000000110 g F .text 000000000000002d event_base_get_method

0000000000000000 *UND* 0000000000000000 __assert_fail

0000000000000000 *UND* 0000000000000000 gettimeofday

0000000000000000 *UND* 0000000000000000 clock_gettime

00000000000001d0 g F .text 00000000000000f5 event_pending

0000000000000000 *UND* 0000000000000000 free

00000000000002f0 g F .text 0000000000000112 event_base_priority_init

0000000000000000 *UND* 0000000000000000 calloc

0000000000000000 *UND* 0000000000000000 malloc

0000000000000000 *UND* 0000000000000000 event_err

0000000000000410 g F .text 000000000000000e event_priority_init

0000000000000420 g F .text 0000000000000145 event_base_new

0000000000000000 *UND* 0000000000000000 epollops

0000000000000000 *UND* 0000000000000000 evutil_getenv

0000000000000000 *UND* 0000000000000000 event_msgx

0000000000000000 *UND* 0000000000000000 event_errx

0000000000000570 g F .text 000000000000001a event_init

00000000000008f0 g F .text 0000000000000106 event_del

0000000000000a00 g F .text 0000000000000222 event_base_free

0000000000000c30 g F .text 00000000000000f9 event_reinit

0000000000000000 *UND* 0000000000000000 realloc

0000000000000f50 g F .text 0000000000000030 event_active

0000000000000f80 g F .text 000000000000048e event_base_loop

0000000000000000 *UND* 0000000000000000 evsignal_base

0000000000001410 g F .text 000000000000000e event_loop

0000000000001420 g F .text 0000000000000007 event_dispatch

0000000000001430 g F .text 0000000000000007 event_base_dispatch

0000000000001440 g F .text 00000000000001f5 event_add

0000000000001640 g F .text 000000000000013a event_base_once

0000000000001780 g F .text 000000000000001d event_once

00000000000017a0 g F .text 000000000000001e event_loopexit

00000000000017c0 g F .text 000000000000001a event_base_loopexit

0000000000000000 *UND* 0000000000000000 pollops

0000000000000000 *UND* 0000000000000000 selectops

buffer.o: file format elf64-x86-64

SYMBOL TABLE:

0000000000000000 l df *ABS* 0000000000000000 buffer.c

0000000000000000 l d .text 0000000000000000 .text

0000000000000000 l d .data 0000000000000000 .data

0000000000000000 l d .bss 0000000000000000 .bss

0000000000000000 l d .debug_abbrev 0000000000000000 .debug_abbrev

0000000000000000 l d .debug_info 0000000000000000 .debug_info

0000000000000000 l d .debug_line 0000000000000000 .debug_line

0000000000000190 l F .text 0000000000000025 evbuffer_align

0000000000000000 l d .rodata.str1.1 0000000000000000 .rodata.str1.1

0000000000000000 l O .rodata 0000000000000012 __func__.4672

0000000000000020 l O .rodata 0000000000000015 __PRETTY_FUNCTION__.4627

0000000000000000 l d .rodata 0000000000000000 .rodata

0000000000000000 l d .debug_frame 0000000000000000 .debug_frame

0000000000000000 l d .eh_frame 0000000000000000 .eh_frame

0000000000000000 l d .debug_loc 0000000000000000 .debug_loc

0000000000000000 l d .debug_pubnames 0000000000000000 .debug_pubnames

0000000000000000 l d .debug_aranges 0000000000000000 .debug_aranges

0000000000000000 l d .debug_ranges 0000000000000000 .debug_ranges

0000000000000000 l d .debug_str 0000000000000000 .debug_str

0000000000000000 l d .note.GNU-stack 0000000000000000 .note.GNU-stack

0000000000000000 l d .comment 0000000000000000 .comment

0000000000000000 g F .text 0000000000000056 evbuffer_drain

0000000000000060 g F .text 0000000000000009 evbuffer_setcb

0000000000000070 g F .text 0000000000000072 evbuffer_find

0000000000000000 *UND* 0000000000000000 memchr

00000000000000f0 g F .text 000000000000004d evbuffer_write

0000000000000000 *UND* 0000000000000000 write

0000000000000140 g F .text 0000000000000049 evbuffer_remove

0000000000000000 *UND* 0000000000000000 memcpy

0000000000000000 *UND* 0000000000000000 memmove

00000000000001c0 g F .text 000000000000009c evbuffer_expand

0000000000000000 *UND* 0000000000000000 realloc

0000000000000260 g F .text 000000000000012f evbuffer_read

0000000000000000 *UND* 0000000000000000 ioctl

0000000000000000 *UND* 0000000000000000 read

0000000000000390 g F .text 00000000000000a0 evbuffer_add

0000000000000430 g F .text 00000000000000e0 evbuffer_add_buffer

0000000000000510 g F .text 0000000000000126 evbuffer_readline

0000000000000000 *UND* 0000000000000000 malloc

0000000000000000 *UND* 0000000000000000 stderr

0000000000000000 *UND* 0000000000000000 fprintf

0000000000000640 g F .text 00000000000000f2 evbuffer_add_vprintf

0000000000000000 *UND* 0000000000000000 evutil_vsnprintf

0000000000000000 *UND* 0000000000000000 __assert_fail

0000000000000740 g F .text 000000000000008e evbuffer_add_printf

00000000000007d0 g F .text 000000000000001b evbuffer_free

0000000000000000 *UND* 0000000000000000 free

00000000000007f0 g F .text 000000000000000f evbuffer_new

0000000000000000 *UND* 0000000000000000 calloc

evbuffer.o: file format elf64-x86-64

SYMBOL TABLE:

0000000000000000 l df *ABS* 0000000000000000 evbuffer.c

0000000000000000 l d .text 0000000000000000 .text

0000000000000000 l d .data 0000000000000000 .data

0000000000000000 l d .bss 0000000000000000 .bss

0000000000000000 l d .debug_abbrev 0000000000000000 .debug_abbrev

0000000000000000 l d .debug_info 0000000000000000 .debug_info

0000000000000000 l d .debug_line 0000000000000000 .debug_line

0000000000000080 l F .text 000000000000002a bufferevent_add

0000000000000650 l F .text 00000000000001d3 bufferevent_readcb

00000000000004c0 l F .text 00000000000000fb bufferevent_writecb

0000000000000000 l d .debug_frame 0000000000000000 .debug_frame

0000000000000000 l d .eh_frame 0000000000000000 .eh_frame

0000000000000000 l d .debug_loc 0000000000000000 .debug_loc

0000000000000000 l d .debug_pubnames 0000000000000000 .debug_pubnames

0000000000000000 l d .debug_aranges 0000000000000000 .debug_aranges

0000000000000000 l d .debug_ranges 0000000000000000 .debug_ranges

0000000000000000 l d .debug_str 0000000000000000 .debug_str

0000000000000000 l d .note.GNU-stack 0000000000000000 .note.GNU-stack

0000000000000000 l d .comment 0000000000000000 .comment

0000000000000000 g F .text 000000000000001d bufferevent_setcb

0000000000000020 g F .text 0000000000000051 bufferevent_base_set

0000000000000000 *UND* 0000000000000000 event_base_set

0000000000000000 *UND* 0000000000000000 event_add

00000000000000b0 g F .text 00000000000000ad bufferevent_settimeout

0000000000000000 *UND* 0000000000000000 event_pending

0000000000000160 g F .text 0000000000000077 bufferevent_enable

00000000000001e0 g F .text 000000000000006f bufferevent_disable

0000000000000000 *UND* 0000000000000000 event_del

0000000000000250 g F .text 0000000000000057 bufferevent_read

0000000000000000 *UND* 0000000000000000 memcpy

0000000000000000 *UND* 0000000000000000 evbuffer_drain

00000000000002b0 g F .text 000000000000006a bufferevent_write

0000000000000000 *UND* 0000000000000000 evbuffer_add

0000000000000320 g F .text 0000000000000041 bufferevent_write_buffer

0000000000000370 g F .text 000000000000003a bufferevent_free

0000000000000000 *UND* 0000000000000000 evbuffer_free

0000000000000000 *UND* 0000000000000000 free

00000000000003b0 g F .text 000000000000004e bufferevent_priority_set

0000000000000000 *UND* 0000000000000000 event_priority_set

0000000000000400 g F .text 00000000000000b9 bufferevent_setfd

0000000000000000 *UND* 0000000000000000 event_set

0000000000000000 *UND* 0000000000000000 evbuffer_write

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SYMBOL TABLE:

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evutil.o: file format elf64-x86-64

SYMBOL TABLE:

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event_tagging.o: file format elf64-x86-64

SYMBOL TABLE:

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http.o: file format elf64-x86-64

SYMBOL TABLE:

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evdns.o: file format elf64-x86-64

SYMBOL TABLE:

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evrpc.o: file format elf64-x86-64

SYMBOL TABLE:

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0000000000000000 l d .data 0000000000000000 .data

0000000000000000 l d .bss 0000000000000000 .bss

0000000000000000 l d .debug_abbrev 0000000000000000 .debug_abbrev

0000000000000000 l d .debug_info 0000000000000000 .debug_info

0000000000000000 l d .debug_line 0000000000000000 .debug_line

0000000000000000 l F .text 000000000000003a evrpc_process_hooks

0000000000000070 l F .text 0000000000000019 evrpc_request_wrapper_free

0000000000000000 l d .rodata.str1.1 0000000000000000 .rodata.str1.1

0000000000000000 l d .rodata.str1.8 0000000000000000 .rodata.str1.8

00000000000000b0 l O .rodata 0000000000000012 __PRETTY_FUNCTION__.5154

0000000000000180 l F .text 000000000000008b evrpc_construct_uri

0000000000000020 l O .rodata 0000000000000014 __func__.5182

0000000000000210 l F .text 0000000000000135 evrpc_schedule_request

0000000000000450 l F .text 00000000000000d2 evrpc_reply_done

0000000000000350 l F .text 0000000000000059 evrpc_pool_schedule

0000000000000530 l F .text 0000000000000031 evrpc_request_timeout

0000000000000000 l O .rodata 0000000000000013 __PRETTY_FUNCTION__.5398

0000000000000040 l O .rodata 0000000000000016 __PRETTY_FUNCTION__.5439

0000000000000060 l O .rodata 000000000000001a __PRETTY_FUNCTION__.5331

0000000000000080 l O .rodata 0000000000000010 __PRETTY_FUNCTION__.5314

00000000000000c2 l O .rodata 000000000000000f __PRETTY_FUNCTION__.5127

0000000000000960 l F .text 00000000000000eb evrpc_request_cb

0000000000000090 l O .rodata 0000000000000015 __PRETTY_FUNCTION__.5228

00000000000000d1 l O .rodata 000000000000000b __PRETTY_FUNCTION__.5097

0000000000000000 l d .rodata 0000000000000000 .rodata

0000000000000000 l d .debug_frame 0000000000000000 .debug_frame

0000000000000000 l d .eh_frame 0000000000000000 .eh_frame

0000000000000000 l d .debug_loc 0000000000000000 .debug_loc

0000000000000000 l d .debug_pubnames 0000000000000000 .debug_pubnames

0000000000000000 l d .debug_aranges 0000000000000000 .debug_aranges

0000000000000000 l d .debug_ranges 0000000000000000 .debug_ranges

0000000000000000 l d .debug_str 0000000000000000 .debug_str

0000000000000000 l d .note.GNU-stack 0000000000000000 .note.GNU-stack

0000000000000000 l d .comment 0000000000000000 .comment

0000000000000040 g F .text 0000000000000022 evrpc_pool_set_timeout

0000000000000000 *UND* 0000000000000000 free

0000000000000090 g F .text 000000000000005f evrpc_reqstate_free

00000000000000f0 g F .text 0000000000000085 evrpc_remove_hook

0000000000000000 *UND* 0000000000000000 __assert_fail

0000000000000000 *UND* 0000000000000000 strlen

0000000000000000 *UND* 0000000000000000 malloc

0000000000000000 *UND* 0000000000000000 memcpy

0000000000000000 *UND* 0000000000000000 event_err

0000000000000000 *UND* 0000000000000000 evhttp_request_new

0000000000000000 *UND* 0000000000000000 event_add

0000000000000000 *UND* 0000000000000000 evhttp_make_request

00000000000003b0 g F .text 000000000000009d evrpc_make_request

0000000000000000 *UND* 0000000000000000 event_set

0000000000000000 *UND* 0000000000000000 event_base_set

0000000000000000 *UND* 0000000000000000 event_del

0000000000000000 *UND* 0000000000000000 evhttp_connection_fail

0000000000000570 g F .text 00000000000000c6 evrpc_pool_add_connection

0000000000000000 *UND* 0000000000000000 evhttp_connection_set_base

0000000000000640 g F .text 00000000000000e6 evrpc_pool_free

0000000000000000 *UND* 0000000000000000 evhttp_connection_free

0000000000000730 g F .text 0000000000000068 evrpc_pool_new

0000000000000000 *UND* 0000000000000000 calloc

00000000000007a0 g F .text 00000000000000ab evrpc_add_hook

0000000000000850 g F .text 000000000000010a evrpc_request_done

0000000000000000 *UND* 0000000000000000 evbuffer_new

0000000000000000 *UND* 0000000000000000 evhttp_find_header

0000000000000000 *UND* 0000000000000000 evhttp_send_reply

0000000000000000 *UND* 0000000000000000 evbuffer_free

0000000000000000 *UND* 0000000000000000 evhttp_send_error

0000000000000000 *UND* 0000000000000000 evhttp_add_header

0000000000000a50 g F .text 00000000000000b1 evrpc_unregister_rpc

0000000000000000 *UND* 0000000000000000 strcmp

0000000000000000 *UND* 0000000000000000 evhttp_del_cb

0000000000000b10 g F .text 00000000000000af evrpc_free

0000000000000bc0 g F .text 000000000000009a evrpc_register_rpc

0000000000000000 *UND* 0000000000000000 evhttp_set_cb

0000000000000c60 g F .text 0000000000000070 evrpc_init

0000000000000000 *UND* 0000000000000000 evtag_init

strlcpy.o: file format elf64-x86-64

SYMBOL TABLE:

0000000000000000 l df *ABS* 0000000000000000 strlcpy.c

0000000000000000 l d .text 0000000000000000 .text

0000000000000000 l d .data 0000000000000000 .data

0000000000000000 l d .bss 0000000000000000 .bss

0000000000000000 l d .debug_abbrev 0000000000000000 .debug_abbrev

0000000000000000 l d .debug_info 0000000000000000 .debug_info

0000000000000000 l d .debug_line 0000000000000000 .debug_line

0000000000000000 l d .debug_frame 0000000000000000 .debug_frame

0000000000000000 l d .eh_frame 0000000000000000 .eh_frame

0000000000000000 l d .debug_loc 0000000000000000 .debug_loc

0000000000000000 l d .debug_pubnames 0000000000000000 .debug_pubnames

0000000000000000 l d .debug_aranges 0000000000000000 .debug_aranges

0000000000000000 l d .debug_str 0000000000000000 .debug_str

0000000000000000 l d .note.GNU-stack 0000000000000000 .note.GNU-stack

0000000000000000 l d .comment 0000000000000000 .comment

0000000000000000 g F .text 000000000000003a _event_strlcpy

select.o: file format elf64-x86-64

SYMBOL TABLE:

0000000000000000 l df *ABS* 0000000000000000 select.c

0000000000000000 l d .text 0000000000000000 .text

0000000000000000 l d .data 0000000000000000 .data

0000000000000000 l d .bss 0000000000000000 .bss

0000000000000000 l d .debug_abbrev 0000000000000000 .debug_abbrev

0000000000000000 l d .debug_info 0000000000000000 .debug_info

0000000000000000 l d .debug_line 0000000000000000 .debug_line

0000000000000000 l F .text 0000000000000074 select_dealloc

0000000000000000 l d .rodata.str1.1 0000000000000000 .rodata.str1.1

0000000000000080 l F .text 00000000000001c3 select_dispatch

0000000000000250 l F .text 000000000000008f select_del

00000000000002e0 l F .text 0000000000000180 select_resize

0000000000000460 l F .text 000000000000011d select_add

0000000000000580 l F .text 0000000000000062 select_init

0000000000000000 l d .rodata 0000000000000000 .rodata

0000000000000000 l d .debug_frame 0000000000000000 .debug_frame

0000000000000000 l d .eh_frame 0000000000000000 .eh_frame

0000000000000000 l d .debug_loc 0000000000000000 .debug_loc

0000000000000000 l d .debug_pubnames 0000000000000000 .debug_pubnames

0000000000000000 l d .debug_aranges 0000000000000000 .debug_aranges

0000000000000000 l d .debug_ranges 0000000000000000 .debug_ranges

0000000000000000 l d .debug_str 0000000000000000 .debug_str

0000000000000000 l d .note.GNU-stack 0000000000000000 .note.GNU-stack

0000000000000000 l d .comment 0000000000000000 .comment

0000000000000000 *UND* 0000000000000000 evsignal_dealloc

0000000000000000 *UND* 0000000000000000 free

0000000000000000 *UND* 0000000000000000 memcpy

0000000000000000 *UND* 0000000000000000 select

0000000000000000 *UND* 0000000000000000 random

0000000000000000 *UND* 0000000000000000 event_active

0000000000000000 *UND* 0000000000000000 evsignal_process

0000000000000000 *UND* 0000000000000000 __errno_location

0000000000000000 *UND* 0000000000000000 event_warn

0000000000000000 *UND* 0000000000000000 evsignal_del

0000000000000000 *UND* 0000000000000000 realloc

0000000000000000 *UND* 0000000000000000 memset

0000000000000000 *UND* 0000000000000000 evsignal_add

0000000000000000 *UND* 0000000000000000 evutil_getenv

0000000000000000 *UND* 0000000000000000 calloc

0000000000000000 *UND* 0000000000000000 evsignal_init

0000000000000000 g O .rodata 0000000000000038 selectops

poll.o: file format elf64-x86-64

SYMBOL TABLE:

0000000000000000 l df *ABS* 0000000000000000 poll.c

0000000000000000 l d .text 0000000000000000 .text

0000000000000000 l d .data 0000000000000000 .data

0000000000000000 l d .bss 0000000000000000 .bss

0000000000000000 l d .debug_abbrev 0000000000000000 .debug_abbrev

0000000000000000 l d .debug_info 0000000000000000 .debug_info

0000000000000000 l d .debug_line 0000000000000000 .debug_line

0000000000000000 l F .text 0000000000000058 poll_dealloc

0000000000000000 l d .rodata.str1.1 0000000000000000 .rodata.str1.1

0000000000000060 l F .text 00000000000001ff poll_dispatch

0000000000000260 l F .text 00000000000000e7 poll_del

0000000000000350 l F .text 0000000000000218 poll_add

0000000000000570 l F .text 0000000000000055 poll_init

0000000000000000 l d .rodata 0000000000000000 .rodata

0000000000000000 l d .debug_frame 0000000000000000 .debug_frame

0000000000000000 l d .eh_frame 0000000000000000 .eh_frame

0000000000000000 l d .debug_loc 0000000000000000 .debug_loc

0000000000000000 l d .debug_pubnames 0000000000000000 .debug_pubnames

0000000000000000 l d .debug_aranges 0000000000000000 .debug_aranges

0000000000000000 l d .debug_ranges 0000000000000000 .debug_ranges

0000000000000000 l d .debug_str 0000000000000000 .debug_str

0000000000000000 l d .note.GNU-stack 0000000000000000 .note.GNU-stack

0000000000000000 l d .comment 0000000000000000 .comment

0000000000000000 *UND* 0000000000000000 evsignal_dealloc

0000000000000000 *UND* 0000000000000000 free

0000000000000000 *UND* 0000000000000000 poll

0000000000000000 *UND* 0000000000000000 random

0000000000000000 *UND* 0000000000000000 evsignal_process

0000000000000000 *UND* 0000000000000000 event_active

0000000000000000 *UND* 0000000000000000 __errno_location

0000000000000000 *UND* 0000000000000000 event_warn

0000000000000000 *UND* 0000000000000000 evsignal_del

0000000000000000 *UND* 0000000000000000 realloc

0000000000000000 *UND* 0000000000000000 memset

0000000000000000 *UND* 0000000000000000 evsignal_add

0000000000000000 *UND* 0000000000000000 evutil_getenv

0000000000000000 *UND* 0000000000000000 calloc

0000000000000000 *UND* 0000000000000000 evsignal_init

0000000000000000 g O .rodata 0000000000000038 pollops

epoll.o: file format elf64-x86-64

SYMBOL TABLE:

0000000000000000 l df *ABS* 0000000000000000 epoll.c

0000000000000000 l d .text 0000000000000000 .text

0000000000000000 l d .data 0000000000000000 .data

0000000000000000 l d .bss 0000000000000000 .bss

0000000000000000 l d .debug_abbrev 0000000000000000 .debug_abbrev

0000000000000000 l d .debug_info 0000000000000000 .debug_info

0000000000000000 l d .debug_line 0000000000000000 .debug_line

0000000000000000 l F .text 0000000000000058 epoll_dealloc

0000000000000000 l d .rodata.str1.1 0000000000000000 .rodata.str1.1

0000000000000060 l F .text 00000000000001a7 epoll_dispatch

0000000000000210 l F .text 00000000000000d3 epoll_del

00000000000002f0 l F .text 000000000000016c epoll_add

0000000000000460 l F .text 000000000000011b epoll_init

0000000000000000 l d .rodata 0000000000000000 .rodata

0000000000000000 l d .debug_frame 0000000000000000 .debug_frame

0000000000000000 l d .eh_frame 0000000000000000 .eh_frame

0000000000000000 l d .debug_loc 0000000000000000 .debug_loc

0000000000000000 l d .debug_pubnames 0000000000000000 .debug_pubnames

0000000000000000 l d .debug_aranges 0000000000000000 .debug_aranges

0000000000000000 l d .debug_ranges 0000000000000000 .debug_ranges

0000000000000000 l d .debug_str 0000000000000000 .debug_str

0000000000000000 l d .note.GNU-stack 0000000000000000 .note.GNU-stack

0000000000000000 l d .comment 0000000000000000 .comment

0000000000000000 *UND* 0000000000000000 evsignal_dealloc

0000000000000000 *UND* 0000000000000000 free

0000000000000000 *UND* 0000000000000000 close

0000000000000000 *UND* 0000000000000000 epoll_wait

0000000000000000 *UND* 0000000000000000 event_active

0000000000000000 *UND* 0000000000000000 realloc

0000000000000000 *UND* 0000000000000000 evsignal_process

0000000000000000 *UND* 0000000000000000 __errno_location

0000000000000000 *UND* 0000000000000000 event_warn

0000000000000000 *UND* 0000000000000000 epoll_ctl

0000000000000000 *UND* 0000000000000000 evsignal_del

0000000000000000 *UND* 0000000000000000 memset

0000000000000000 *UND* 0000000000000000 evsignal_add

0000000000000000 *UND* 0000000000000000 evutil_getenv

0000000000000000 *UND* 0000000000000000 epoll_create

0000000000000000 *UND* 0000000000000000 fcntl

0000000000000000 *UND* 0000000000000000 calloc

0000000000000000 *UND* 0000000000000000 malloc

0000000000000000 *UND* 0000000000000000 evsignal_init

0000000000000000 g O .rodata 0000000000000038 epollops

signal.o: file format elf64-x86-64

SYMBOL TABLE:

0000000000000000 l df *ABS* 0000000000000000 signal.c

0000000000000000 l d .text 0000000000000000 .text

0000000000000000 l d .data 0000000000000000 .data

0000000000000000 l d .bss 0000000000000000 .bss

0000000000000000 l d .debug_abbrev 0000000000000000 .debug_abbrev

0000000000000000 l d .debug_info 0000000000000000 .debug_info

0000000000000000 l d .debug_line 0000000000000000 .debug_line

0000000000000000 l d .rodata.str1.1 0000000000000000 .rodata.str1.1

0000000000000000 l d .rodata.str1.8 0000000000000000 .rodata.str1.8

0000000000000000 l O .rodata 000000000000000d __PRETTY_FUNCTION__.5056

0000000000000250 l F .text 00000000000000a5 evsignal_handler

0000000000000030 l O .rodata 0000000000000011 __func__.5074

000000000000001a l O .rodata 000000000000000d __func__.5016

000000000000000d l O .rodata 000000000000000d __PRETTY_FUNCTION__.5017

00000000000006d0 l F .text 000000000000003a evsignal_cb

0000000000000041 l O .rodata 000000000000000e __func__.4954

0000000000000008 l O .bss 0000000000000001 signals.4946

000000000000004f l O .rodata 000000000000000c __func__.4948

0000000000000000 l d .rodata 0000000000000000 .rodata

0000000000000000 l d .debug_frame 0000000000000000 .debug_frame

0000000000000000 l d .eh_frame 0000000000000000 .eh_frame

0000000000000000 l d .debug_loc 0000000000000000 .debug_loc

0000000000000000 l d .debug_pubnames 0000000000000000 .debug_pubnames

0000000000000000 l d .debug_aranges 0000000000000000 .debug_aranges

0000000000000000 l d .debug_ranges 0000000000000000 .debug_ranges

0000000000000000 l d .debug_str 0000000000000000 .debug_str

0000000000000000 l d .note.GNU-stack 0000000000000000 .note.GNU-stack

0000000000000000 l d .comment 0000000000000000 .comment

0000000000000000 g F .text 0000000000000096 evsignal_process

0000000000000000 *UND* 0000000000000000 event_active

0000000000000000 *UND* 0000000000000000 event_del

00000000000000a0 g F .text 0000000000000072 _evsignal_restore_handler

0000000000000000 *UND* 0000000000000000 sigaction

0000000000000000 *UND* 0000000000000000 free

0000000000000000 *UND* 0000000000000000 event_warn

0000000000000120 g F .text 000000000000009e evsignal_dealloc

0000000000000000 *UND* 0000000000000000 close

00000000000001c0 g F .text 000000000000008a evsignal_del

0000000000000000 *UND* 0000000000000000 __assert_fail

0000000000000000 *UND* 0000000000000000 __errno_location

0000000000000000 g O .bss 0000000000000008 evsignal_base

0000000000000000 *UND* 0000000000000000 send

0000000000000300 g F .text 0000000000000170 _evsignal_set_handler

0000000000000000 *UND* 0000000000000000 realloc

0000000000000000 *UND* 0000000000000000 memset

0000000000000000 *UND* 0000000000000000 malloc

0000000000000000 *UND* 0000000000000000 sigfillset

0000000000000470 g F .text 000000000000010a evsignal_add

0000000000000000 *UND* 0000000000000000 event_errx

0000000000000000 *UND* 0000000000000000 event_add

0000000000000580 g F .text 0000000000000143 evsignal_init

0000000000000000 *UND* 0000000000000000 evutil_socketpair

0000000000000000 *UND* 0000000000000000 fcntl

0000000000000000 *UND* 0000000000000000 evutil_make_socket_nonblocking

0000000000000000 *UND* 0000000000000000 event_set

0000000000000000 *UND* 0000000000000000 event_err

0000000000000000 *UND* 0000000000000000 recv

[root@Betty lib]#

作为对比提供 nm 的输出结果。

nm - list symbols from object files
==================
-s
--print-armap
When listing symbols from archive members, include the index: a mapping (stored in the archive by ar or ranlib) of which modules contain definitions for which names.
===================

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[root@Betty lib]# nm -s libevent.a

Archive index:

event_base_loopbreak in event.o

event_loopbreak in event.o

current_base in event.o

event_set in event.o

event_base_set in event.o

event_priority_set in event.o

event_get_version in event.o

event_get_method in event.o

event_base_get_method in event.o

event_pending in event.o

event_base_priority_init in event.o

event_priority_init in event.o

event_base_new in event.o

event_init in event.o

event_del in event.o

event_base_free in event.o

event_reinit in event.o

event_active in event.o

event_base_loop in event.o

event_loop in event.o

event_dispatch in event.o

event_base_dispatch in event.o

event_add in event.o

event_base_once in event.o

event_once in event.o

event_loopexit in event.o

event_base_loopexit in event.o

evbuffer_drain in buffer.o

evbuffer_setcb in buffer.o

evbuffer_find in buffer.o

evbuffer_write in buffer.o

evbuffer_remove in buffer.o

evbuffer_expand in buffer.o

evbuffer_read in buffer.o

evbuffer_add in buffer.o

evbuffer_add_buffer in buffer.o

evbuffer_readline in buffer.o

evbuffer_add_vprintf in buffer.o

evbuffer_add_printf in buffer.o

evbuffer_free in buffer.o

evbuffer_new in buffer.o

bufferevent_setcb in evbuffer.o

bufferevent_base_set in evbuffer.o

bufferevent_settimeout in evbuffer.o

bufferevent_enable in evbuffer.o

bufferevent_disable in evbuffer.o

bufferevent_read in evbuffer.o

bufferevent_write in evbuffer.o

bufferevent_write_buffer in evbuffer.o

bufferevent_free in evbuffer.o

bufferevent_priority_set in evbuffer.o

bufferevent_setfd in evbuffer.o

bufferevent_read_pressure_cb in evbuffer.o

bufferevent_setwatermark in evbuffer.o

bufferevent_new in evbuffer.o

event_set_log_callback in log.o

_event_debugx in log.o

event_msgx in log.o

event_warnx in log.o

event_errx in log.o

event_warn in log.o

event_err in log.o

evutil_getenv in evutil.o

evutil_vsnprintf in evutil.o

evutil_snprintf in evutil.o

evutil_strtoll in evutil.o

evutil_make_socket_nonblocking in evutil.o

evutil_socketpair in evutil.o

evtag_decode_int in event_tagging.o

evtag_consume in event_tagging.o

evtag_payload_length in event_tagging.o

evtag_peek_length in event_tagging.o

evtag_peek in event_tagging.o

evtag_decode_tag in event_tagging.o

evtag_unmarshal_int in event_tagging.o

evtag_unmarshal in event_tagging.o

evtag_unmarshal_timeval in event_tagging.o

evtag_unmarshal_string in event_tagging.o

evtag_unmarshal_fixed in event_tagging.o

evtag_encode_tag in event_tagging.o

encode_int in event_tagging.o

evtag_marshal_int in event_tagging.o

evtag_marshal in event_tagging.o

evtag_marshal_timeval in event_tagging.o

evtag_marshal_string in event_tagging.o

evtag_init in event_tagging.o

evhttp_connection_set_timeout in http.o

evhttp_connection_set_retries in http.o

evhttp_connection_set_closecb in http.o

evhttp_connection_get_peer in http.o

evhttp_set_timeout in http.o

evhttp_set_gencb in http.o

evhttp_request_set_chunked_cb in http.o

evhttp_request_uri in http.o

evhttp_clear_headers in http.o

evhttp_response_code in http.o

evhttp_request_free in http.o

evhttp_del_cb in http.o

evhttp_set_cb in http.o

evhttp_request_new in http.o

evhttp_new in http.o

evhttp_connection_free in http.o

evhttp_free in http.o

evhttp_connection_new in http.o

evhttp_accept_socket in http.o

evhttp_start_read in http.o

evhttp_read in http.o

evhttp_bind_socket in http.o

evhttp_start in http.o

evhttp_decode_uri in http.o

evhttp_encode_uri in http.o

evhttp_connection_set_base in http.o

evhttp_get_request in http.o

evhttp_connection_set_local_port in http.o

evhttp_connection_set_local_address in http.o

evhttp_remove_header in http.o

evhttp_find_header in http.o

evhttp_write_buffer in http.o

evhttp_write in http.o

evhttp_send_reply_end in http.o

evhttp_send_reply_chunk in http.o

evhttp_parse_firstline in http.o

evhttp_add_header in http.o

evhttp_parse_headers in http.o

evhttp_connection_reset in http.o

evhttp_connection_connect in http.o

evhttp_connection_fail in http.o

evhttp_hostportfile in http.o

evhttp_make_header in http.o

evhttp_send_reply_start in http.o

evhttp_send_page in http.o

evhttp_send_error in http.o

evhttp_make_request in http.o

evhttp_htmlescape in http.o

evhttp_parse_query in http.o

evhttp_send_reply in http.o

evdns_set_log_fn in evdns.o

evdns_set_transaction_id_fn in evdns.o

evdns_count_nameservers in evdns.o

evdns_err_to_string in evdns.o

evdns_clear_nameservers_and_suspend in evdns.o

evdns_server_request_drop in evdns.o

evdns_close_server_port in evdns.o

evdns_resume in evdns.o

evdns_shutdown in evdns.o

evdns_server_request_get_requesting_addr in evdns.o

evdns_search_ndots_set in evdns.o

evdns_search_add in evdns.o

evdns_search_clear in evdns.o

evdns_add_server_port in evdns.o

evdns_server_request_add_reply in evdns.o

evdns_server_request_add_cname_reply in evdns.o

evdns_server_request_add_ptr_reply in evdns.o

evdns_server_request_add_aaaa_reply in evdns.o

evdns_server_request_add_a_reply in evdns.o

evdns_server_request_respond in evdns.o

evdns_resolve_reverse_ipv6 in evdns.o

evdns_resolve_reverse in evdns.o

evdns_resolve_ipv6 in evdns.o

evdns_resolve_ipv4 in evdns.o

evdns_set_option in evdns.o

evdns_nameserver_ip_add in evdns.o

evdns_nameserver_add in evdns.o

evdns_resolv_conf_parse in evdns.o

evdns_init in evdns.o

evrpc_pool_set_timeout in evrpc.o

evrpc_reqstate_free in evrpc.o

evrpc_remove_hook in evrpc.o

evrpc_make_request in evrpc.o

evrpc_pool_add_connection in evrpc.o

evrpc_pool_free in evrpc.o

evrpc_pool_new in evrpc.o

evrpc_add_hook in evrpc.o

evrpc_request_done in evrpc.o

evrpc_unregister_rpc in evrpc.o

evrpc_free in evrpc.o

evrpc_register_rpc in evrpc.o

evrpc_init in evrpc.o

_event_strlcpy in strlcpy.o

selectops in select.o

pollops in poll.o

epollops in epoll.o

evsignal_process in signal.o

_evsignal_restore_handler in signal.o

evsignal_dealloc in signal.o

evsignal_del in signal.o

evsignal_base in signal.o

_evsignal_set_handler in signal.o

evsignal_add in signal.o

evsignal_init in signal.o

event.o:

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buffer.o:

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U __assert_fail

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U calloc

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U memcpy

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evbuffer.o:

U __errno_location

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log.o:

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evutil.o:

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event_tagging.o:

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http.o:

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U evbuffer_write

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U strchr

U strcmp

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U strftime

U strlen

U strncasecmp

U strncmp

U strpbrk

U strspn

U time

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evdns.o:

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U clock_gettime

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evrpc.o:

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strlcpy.o:

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select.o:

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poll.o:

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epoll.o:

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signal.o:

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[root@Betty lib]#

示例二：以自定义文件 objtest.c 进行演示。

示例程序如下。

[root@Betty Cpp]# vi objtest.c

/*

g++ -g -Wstrict-prototypes -Wall -Wunused -o objtest objtest.c

*/

#include <unistd.h>

int main ( int argc, char * argv[] )

{

execl( "/bin/sh", "/bin/sh", "-i", 0 );

return 0;

}

执行编译。

[root@Betty Cpp]# g++ -g -Wstrict-prototypes -Wall -Wunused -o objtest objtest.c

cc1plus: warning: command line option "-Wstrict-prototypes" is valid for Ada/C/ObjC but not for C++

objtest.c: In function 'int main(int, char**)':

objtest.c:7: warning: missing sentinel in function call

[root@Betty Cpp]#

[root@Betty Cpp]# ll

total 16

-rwxr-xr-x 1 root root 8587 Jul 18 11:04 objtest

-rw-r--r-- 1 root root 190 Jul 18 10:55 objtest.c

[root@Betty Cpp]#

虽然能够编译出来东东，但是出现了若干警告信息。

cc1plus: warning: command line option "-Wstrict-prototypes" is valid for Ada/C/ObjC but not for C++

是因为 -Wstrict-prototypes 是 C only 的，所以 g++ 应该改为 gcc 。
参考：man gcc

objtest.c:7: warning: missing sentinel in function call

是因为在调用 execl( "/bin/sh", "/bin/sh", "-i", 0 ); 的时候，最后一个参数的格式不符合要求，应该改为 (char *)0 或者 (char *)NULL 。
参考：man execl

另外 -Wall 其实是隐含包含了 -Wunused 的，所以可以将 -Wunused 去掉。

完成修改后不会输出仍和警告信息。

1 2	`[root@Betty Cpp]# gcc -g -Wstrict-prototypes -Wall -o objtest objtest.c` `[root@Betty Cpp]#`

使用 objdump 输出相关信息。

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[root@Betty Cpp]#

[root@Betty Cpp]# objdump -j .text -Sl objtest

objtest: file format elf64-x86-64

Disassembly of section .text:

00000000004004a0 <_start>:

_start():

4004a0: 31 ed xor %ebp,%ebp

4004a2: 49 89 d1 mov %rdx,%r9

4004a5: 5e pop %rsi

4004a6: 48 89 e2 mov %rsp,%rdx

4004a9: 48 83 e4 f0 and $0xfffffffffffffff0,%rsp

4004ad: 50 push %rax

4004ae: 54 push %rsp

4004af: 49 c7 c0 b0 05 40 00 mov $0x4005b0,%r8

4004b6: 48 c7 c1 c0 05 40 00 mov $0x4005c0,%rcx

4004bd: 48 c7 c7 78 05 40 00 mov $0x400578,%rdi

4004c4: e8 af ff ff ff callq 400478 <__libc_start_main@plt>

4004c9: f4 hlt

4004ca: 90 nop

4004cb: 90 nop

00000000004004cc <call_gmon_start>:

call_gmon_start():

4004cc: 48 83 ec 08 sub $0x8,%rsp

4004d0: 48 8b 05 89 04 20 00 mov 2098313(%rip),%rax # 600960 <_DYNAMIC+0x1c0>

4004d7: 48 85 c0 test %rax,%rax

4004da: 74 02 je 4004de <call_gmon_start+0x12>

4004dc: ff d0 callq *%rax

4004de: 48 83 c4 08 add $0x8,%rsp

4004e2: c3 retq

4004e3: 90 nop

4004e4: 90 nop

4004e5: 90 nop

4004e6: 90 nop

4004e7: 90 nop

4004e8: 90 nop

4004e9: 90 nop

4004ea: 90 nop

4004eb: 90 nop

4004ec: 90 nop

4004ed: 90 nop

4004ee: 90 nop

4004ef: 90 nop

00000000004004f0 <__do_global_dtors_aux>:

__do_global_dtors_aux():

4004f0: 55 push %rbp

4004f1: 48 89 e5 mov %rsp,%rbp

4004f4: 53 push %rbx

4004f5: 48 83 ec 08 sub $0x8,%rsp

4004f9: 80 3d a8 04 20 00 00 cmpb $0x0,2098344(%rip) # 6009a8 <completed.6145>

400500: 75 44 jne 400546 <__do_global_dtors_aux+0x56>

400502: b8 90 07 60 00 mov $0x600790,%eax

400507: 48 2d 88 07 60 00 sub $0x600788,%rax

40050d: 48 c1 f8 03 sar $0x3,%rax

400511: 48 8d 58 ff lea 0xffffffffffffffff(%rax),%rbx

400515: 48 8b 05 84 04 20 00 mov 2098308(%rip),%rax # 6009a0 <dtor_idx.6147>

40051c: 48 39 c3 cmp %rax,%rbx

40051f: 76 1e jbe 40053f <__do_global_dtors_aux+0x4f>

400521: 48 83 c0 01 add $0x1,%rax

400525: 48 89 05 74 04 20 00 mov %rax,2098292(%rip) # 6009a0 <dtor_idx.6147>

40052c: ff 14 c5 88 07 60 00 callq *0x600788(,%rax,8)

400533: 48 8b 05 66 04 20 00 mov 2098278(%rip),%rax # 6009a0 <dtor_idx.6147>

40053a: 48 39 c3 cmp %rax,%rbx

40053d: 77 e2 ja 400521 <__do_global_dtors_aux+0x31>

40053f: c6 05 62 04 20 00 01 movb $0x1,2098274(%rip) # 6009a8 <completed.6145>

400546: 48 83 c4 08 add $0x8,%rsp

40054a: 5b pop %rbx

40054b: c9 leaveq

40054c: c3 retq

40054d: 0f 1f 00 nopl (%rax)

0000000000400550 <frame_dummy>:

frame_dummy():

400550: 55 push %rbp

400551: 48 83 3d 3f 02 20 00 cmpq $0x0,2097727(%rip) # 600798 <__JCR_END__>

400558: 00

400559: 48 89 e5 mov %rsp,%rbp

40055c: 74 16 je 400574 <frame_dummy+0x24>

40055e: b8 00 00 00 00 mov $0x0,%eax

400563: 48 85 c0 test %rax,%rax

400566: 74 0c je 400574 <frame_dummy+0x24>

400568: bf 98 07 60 00 mov $0x600798,%edi

40056d: 49 89 c3 mov %rax,%r11

400570: c9 leaveq

400571: 41 ff e3 jmpq *%r11

400574: c9 leaveq

400575: c3 retq

400576: 90 nop

400577: 90 nop

0000000000400578 <main>:

main():

/root/workstation/CODE_TEST/Cpp/objtest.c:5

/*

g++ -g -Wstrict-prototypes -Wall -Wunused -o objtest objtest.c

*/

#include <unistd.h>

int main ( int argc, char * argv[] )

400578: 55 push %rbp

400579: 48 89 e5 mov %rsp,%rbp

40057c: 48 83 ec 10 sub $0x10,%rsp

400580: 89 7d fc mov %edi,0xfffffffffffffffc(%rbp)

400583: 48 89 75 f0 mov %rsi,0xfffffffffffffff0(%rbp)

/root/workstation/CODE_TEST/Cpp/objtest.c:7

{

execl( "/bin/sh", "/bin/sh", "-i", 0 );

400587: b9 00 00 00 00 mov $0x0,%ecx

40058c: ba a8 06 40 00 mov $0x4006a8,%edx

400591: be ab 06 40 00 mov $0x4006ab,%esi

400596: bf ab 06 40 00 mov $0x4006ab,%edi

40059b: b8 00 00 00 00 mov $0x0,%eax

4005a0: e8 c3 fe ff ff callq 400468 <execl@plt>

/root/workstation/CODE_TEST/Cpp/objtest.c:8

return 0;

4005a5: b8 00 00 00 00 mov $0x0,%eax

/root/workstation/CODE_TEST/Cpp/objtest.c:9

}

4005aa: c9 leaveq

4005ab: c3 retq

4005ac: 90 nop

4005ad: 90 nop

4005ae: 90 nop

4005af: 90 nop

00000000004005b0 <__libc_csu_fini>:

__libc_csu_fini():

4005b0: f3 c3 repz retq

4005b2: 0f 1f 80 00 00 00 00 nopl 0x0(%rax)

4005b9: 0f 1f 80 00 00 00 00 nopl 0x0(%rax)

00000000004005c0 <__libc_csu_init>:

__libc_csu_init():

4005c0: 4c 89 64 24 e0 mov %r12,0xffffffffffffffe0(%rsp)

4005c5: 4c 89 6c 24 e8 mov %r13,0xffffffffffffffe8(%rsp)

4005ca: 4c 8d 25 a3 01 20 00 lea 2097571(%rip),%r12 # 600774 <__fini_array_end>

4005d1: 4c 89 74 24 f0 mov %r14,0xfffffffffffffff0(%rsp)

4005d6: 4c 89 7c 24 f8 mov %r15,0xfffffffffffffff8(%rsp)

4005db: 49 89 f6 mov %rsi,%r14

4005de: 48 89 5c 24 d0 mov %rbx,0xffffffffffffffd0(%rsp)

4005e3: 48 89 6c 24 d8 mov %rbp,0xffffffffffffffd8(%rsp)

4005e8: 48 83 ec 38 sub $0x38,%rsp

4005ec: 41 89 ff mov %edi,%r15d

4005ef: 49 89 d5 mov %rdx,%r13

4005f2: e8 49 fe ff ff callq 400440 <_init>

4005f7: 48 8d 05 76 01 20 00 lea 2097526(%rip),%rax # 600774 <__fini_array_end>

4005fe: 49 29 c4 sub %rax,%r12

400601: 49 c1 fc 03 sar $0x3,%r12

400605: 4d 85 e4 test %r12,%r12

400608: 74 1e je 400628 <__libc_csu_init+0x68>

40060a: 31 ed xor %ebp,%ebp

40060c: 48 89 c3 mov %rax,%rbx

40060f: 90 nop

400610: 48 83 c5 01 add $0x1,%rbp

400614: 4c 89 ea mov %r13,%rdx

400617: 4c 89 f6 mov %r14,%rsi

40061a: 44 89 ff mov %r15d,%edi

40061d: ff 13 callq *(%rbx)

40061f: 48 83 c3 08 add $0x8,%rbx

400623: 49 39 ec cmp %rbp,%r12

400626: 75 e8 jne 400610 <__libc_csu_init+0x50>

400628: 48 8b 5c 24 08 mov 0x8(%rsp),%rbx

40062d: 48 8b 6c 24 10 mov 0x10(%rsp),%rbp

400632: 4c 8b 64 24 18 mov 0x18(%rsp),%r12

400637: 4c 8b 6c 24 20 mov 0x20(%rsp),%r13

40063c: 4c 8b 74 24 28 mov 0x28(%rsp),%r14

400641: 4c 8b 7c 24 30 mov 0x30(%rsp),%r15

400646: 48 83 c4 38 add $0x38,%rsp

40064a: c3 retq

40064b: 90 nop

40064c: 90 nop

40064d: 90 nop

40064e: 90 nop

40064f: 90 nop

0000000000400650 <__do_global_ctors_aux>:

__do_global_ctors_aux():

400650: 55 push %rbp

400651: 48 89 e5 mov %rsp,%rbp

400654: 53 push %rbx

400655: bb 78 07 60 00 mov $0x600778,%ebx

40065a: 48 83 ec 08 sub $0x8,%rsp

40065e: 48 8b 05 13 01 20 00 mov 2097427(%rip),%rax # 600778 <__CTOR_LIST__>

400665: 48 83 f8 ff cmp $0xffffffffffffffff,%rax

400669: 74 14 je 40067f <__do_global_ctors_aux+0x2f>

40066b: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)

400670: 48 83 eb 08 sub $0x8,%rbx

400674: ff d0 callq *%rax

400676: 48 8b 03 mov (%rbx),%rax

400679: 48 83 f8 ff cmp $0xffffffffffffffff,%rax

40067d: 75 f1 jne 400670 <__do_global_ctors_aux+0x20>

40067f: 48 83 c4 08 add $0x8,%rsp

400683: 5b pop %rbx

400684: c9 leaveq

400685: c3 retq

400686: 90 nop

400687: 90 nop

[root@Betty Cpp]#

反汇编的时候，显示每一行的完整地址。

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[root@Betty Cpp]#

[root@Betty Cpp]# objdump -j .text -Sl objtest --prefix-addresses

objtest: file format elf64-x86-64

Disassembly of section .text:

_start():

00000000004004a0 <_start> xor %ebp,%ebp

00000000004004a2 <_start+0x2> mov %rdx,%r9

00000000004004a5 <_start+0x5> pop %rsi

00000000004004a6 <_start+0x6> mov %rsp,%rdx

00000000004004a9 <_start+0x9> and $0xfffffffffffffff0,%rsp

00000000004004ad <_start+0xd> push %rax

00000000004004ae <_start+0xe> push %rsp

00000000004004af <_start+0xf> mov $0x4005b0,%r8

00000000004004b6 <_start+0x16> mov $0x4005c0,%rcx

00000000004004bd <_start+0x1d> mov $0x400578,%rdi

00000000004004c4 <_start+0x24> callq 0000000000400478 <__libc_start_main@plt>

00000000004004c9 <_start+0x29> hlt

00000000004004ca <_start+0x2a> nop

00000000004004cb <_start+0x2b> nop

call_gmon_start():

00000000004004cc <call_gmon_start> sub $0x8,%rsp

00000000004004d0 <call_gmon_start+0x4> mov 2098313(%rip),%rax # 0000000000600960 <_DYNAMIC+0x1c0>

00000000004004d7 <call_gmon_start+0xb> test %rax,%rax

00000000004004da <call_gmon_start+0xe> je 00000000004004de <call_gmon_start+0x12>

00000000004004dc <call_gmon_start+0x10> callq *%rax

00000000004004de <call_gmon_start+0x12> add $0x8,%rsp

00000000004004e2 <call_gmon_start+0x16> retq

00000000004004e3 <call_gmon_start+0x17> nop

00000000004004e4 <call_gmon_start+0x18> nop

00000000004004e5 <call_gmon_start+0x19> nop

00000000004004e6 <call_gmon_start+0x1a> nop

00000000004004e7 <call_gmon_start+0x1b> nop

00000000004004e8 <call_gmon_start+0x1c> nop

00000000004004e9 <call_gmon_start+0x1d> nop

00000000004004ea <call_gmon_start+0x1e> nop

00000000004004eb <call_gmon_start+0x1f> nop

00000000004004ec <call_gmon_start+0x20> nop

00000000004004ed <call_gmon_start+0x21> nop

00000000004004ee <call_gmon_start+0x22> nop

00000000004004ef <call_gmon_start+0x23> nop

__do_global_dtors_aux():

00000000004004f0 <__do_global_dtors_aux> push %rbp

00000000004004f1 <__do_global_dtors_aux+0x1> mov %rsp,%rbp

00000000004004f4 <__do_global_dtors_aux+0x4> push %rbx

00000000004004f5 <__do_global_dtors_aux+0x5> sub $0x8,%rsp

00000000004004f9 <__do_global_dtors_aux+0x9> cmpb $0x0,2098344(%rip) # 00000000006009a8 <completed.6145>

0000000000400500 <__do_global_dtors_aux+0x10> jne 0000000000400546 <__do_global_dtors_aux+0x56>

0000000000400502 <__do_global_dtors_aux+0x12> mov $0x600790,%eax

0000000000400507 <__do_global_dtors_aux+0x17> sub $0x600788,%rax

000000000040050d <__do_global_dtors_aux+0x1d> sar $0x3,%rax

0000000000400511 <__do_global_dtors_aux+0x21> lea 0xffffffffffffffff(%rax),%rbx

0000000000400515 <__do_global_dtors_aux+0x25> mov 2098308(%rip),%rax # 00000000006009a0 <dtor_idx.6147>

000000000040051c <__do_global_dtors_aux+0x2c> cmp %rax,%rbx

000000000040051f <__do_global_dtors_aux+0x2f> jbe 000000000040053f <__do_global_dtors_aux+0x4f>

0000000000400521 <__do_global_dtors_aux+0x31> add $0x1,%rax

0000000000400525 <__do_global_dtors_aux+0x35> mov %rax,2098292(%rip) # 00000000006009a0 <dtor_idx.6147>

000000000040052c <__do_global_dtors_aux+0x3c> callq *0x600788(,%rax,8)

0000000000400533 <__do_global_dtors_aux+0x43> mov 2098278(%rip),%rax # 00000000006009a0 <dtor_idx.6147>

000000000040053a <__do_global_dtors_aux+0x4a> cmp %rax,%rbx

000000000040053d <__do_global_dtors_aux+0x4d> ja 0000000000400521 <__do_global_dtors_aux+0x31>

000000000040053f <__do_global_dtors_aux+0x4f> movb $0x1,2098274(%rip) # 00000000006009a8 <completed.6145>

0000000000400546 <__do_global_dtors_aux+0x56> add $0x8,%rsp

000000000040054a <__do_global_dtors_aux+0x5a> pop %rbx

000000000040054b <__do_global_dtors_aux+0x5b> leaveq

000000000040054c <__do_global_dtors_aux+0x5c> retq

000000000040054d <__do_global_dtors_aux+0x5d> nopl (%rax)

frame_dummy():

0000000000400550 <frame_dummy> push %rbp

0000000000400551 <frame_dummy+0x1> cmpq $0x0,2097727(%rip) # 0000000000600798 <__JCR_END__>

0000000000400559 <frame_dummy+0x9> mov %rsp,%rbp

000000000040055c <frame_dummy+0xc> je 0000000000400574 <frame_dummy+0x24>

000000000040055e <frame_dummy+0xe> mov $0x0,%eax

0000000000400563 <frame_dummy+0x13> test %rax,%rax

0000000000400566 <frame_dummy+0x16> je 0000000000400574 <frame_dummy+0x24>

0000000000400568 <frame_dummy+0x18> mov $0x600798,%edi

000000000040056d <frame_dummy+0x1d> mov %rax,%r11

0000000000400570 <frame_dummy+0x20> leaveq

0000000000400571 <frame_dummy+0x21> jmpq *%r11

0000000000400574 <frame_dummy+0x24> leaveq

0000000000400575 <frame_dummy+0x25> retq

0000000000400576 <frame_dummy+0x26> nop

0000000000400577 <frame_dummy+0x27> nop

main():

/root/workstation/CODE_TEST/Cpp/objtest.c:5

/*

g++ -g -Wstrict-prototypes -Wall -Wunused -o objtest objtest.c

*/

#include <unistd.h>

int main ( int argc, char * argv[] )

0000000000400578 <main> push %rbp

0000000000400579 <main+0x1> mov %rsp,%rbp

000000000040057c <main+0x4> sub $0x10,%rsp

0000000000400580 <main+0x8> mov %edi,0xfffffffffffffffc(%rbp)

0000000000400583 <main+0xb> mov %rsi,0xfffffffffffffff0(%rbp)

/root/workstation/CODE_TEST/Cpp/objtest.c:7

{

execl( "/bin/sh", "/bin/sh", "-i", 0 );

0000000000400587 <main+0xf> mov $0x0,%ecx

000000000040058c <main+0x14> mov $0x4006a8,%edx

0000000000400591 <main+0x19> mov $0x4006ab,%esi

0000000000400596 <main+0x1e> mov $0x4006ab,%edi

000000000040059b <main+0x23> mov $0x0,%eax

00000000004005a0 <main+0x28> callq 0000000000400468 <execl@plt>

/root/workstation/CODE_TEST/Cpp/objtest.c:8

return 0;

00000000004005a5 <main+0x2d> mov $0x0,%eax

/root/workstation/CODE_TEST/Cpp/objtest.c:9

}

00000000004005aa <main+0x32> leaveq

00000000004005ab <main+0x33> retq

00000000004005ac <main+0x34> nop

00000000004005ad <main+0x35> nop

00000000004005ae <main+0x36> nop

00000000004005af <main+0x37> nop

__libc_csu_fini():

00000000004005b0 <__libc_csu_fini> repz retq

00000000004005b2 <__libc_csu_fini+0x2> nopl 0x0(%rax)

00000000004005b9 <__libc_csu_fini+0x9> nopl 0x0(%rax)

__libc_csu_init():

00000000004005c0 <__libc_csu_init> mov %r12,0xffffffffffffffe0(%rsp)

00000000004005c5 <__libc_csu_init+0x5> mov %r13,0xffffffffffffffe8(%rsp)

00000000004005ca <__libc_csu_init+0xa> lea 2097571(%rip),%r12 # 0000000000600774 <__fini_array_end>

00000000004005d1 <__libc_csu_init+0x11> mov %r14,0xfffffffffffffff0(%rsp)

00000000004005d6 <__libc_csu_init+0x16> mov %r15,0xfffffffffffffff8(%rsp)

00000000004005db <__libc_csu_init+0x1b> mov %rsi,%r14

00000000004005de <__libc_csu_init+0x1e> mov %rbx,0xffffffffffffffd0(%rsp)

00000000004005e3 <__libc_csu_init+0x23> mov %rbp,0xffffffffffffffd8(%rsp)

00000000004005e8 <__libc_csu_init+0x28> sub $0x38,%rsp

00000000004005ec <__libc_csu_init+0x2c> mov %edi,%r15d

00000000004005ef <__libc_csu_init+0x2f> mov %rdx,%r13

00000000004005f2 <__libc_csu_init+0x32> callq 0000000000400440 <_init>

00000000004005f7 <__libc_csu_init+0x37> lea 2097526(%rip),%rax # 0000000000600774 <__fini_array_end>

00000000004005fe <__libc_csu_init+0x3e> sub %rax,%r12

0000000000400601 <__libc_csu_init+0x41> sar $0x3,%r12

0000000000400605 <__libc_csu_init+0x45> test %r12,%r12

0000000000400608 <__libc_csu_init+0x48> je 0000000000400628 <__libc_csu_init+0x68>

000000000040060a <__libc_csu_init+0x4a> xor %ebp,%ebp

000000000040060c <__libc_csu_init+0x4c> mov %rax,%rbx

000000000040060f <__libc_csu_init+0x4f> nop

0000000000400610 <__libc_csu_init+0x50> add $0x1,%rbp

0000000000400614 <__libc_csu_init+0x54> mov %r13,%rdx

0000000000400617 <__libc_csu_init+0x57> mov %r14,%rsi

000000000040061a <__libc_csu_init+0x5a> mov %r15d,%edi

000000000040061d <__libc_csu_init+0x5d> callq *(%rbx)

000000000040061f <__libc_csu_init+0x5f> add $0x8,%rbx

0000000000400623 <__libc_csu_init+0x63> cmp %rbp,%r12

0000000000400626 <__libc_csu_init+0x66> jne 0000000000400610 <__libc_csu_init+0x50>

0000000000400628 <__libc_csu_init+0x68> mov 0x8(%rsp),%rbx

000000000040062d <__libc_csu_init+0x6d> mov 0x10(%rsp),%rbp

0000000000400632 <__libc_csu_init+0x72> mov 0x18(%rsp),%r12

0000000000400637 <__libc_csu_init+0x77> mov 0x20(%rsp),%r13

000000000040063c <__libc_csu_init+0x7c> mov 0x28(%rsp),%r14

0000000000400641 <__libc_csu_init+0x81> mov 0x30(%rsp),%r15

0000000000400646 <__libc_csu_init+0x86> add $0x38,%rsp

000000000040064a <__libc_csu_init+0x8a> retq

000000000040064b <__libc_csu_init+0x8b> nop

000000000040064c <__libc_csu_init+0x8c> nop

000000000040064d <__libc_csu_init+0x8d> nop

000000000040064e <__libc_csu_init+0x8e> nop

000000000040064f <__libc_csu_init+0x8f> nop

__do_global_ctors_aux():

0000000000400650 <__do_global_ctors_aux> push %rbp

0000000000400651 <__do_global_ctors_aux+0x1> mov %rsp,%rbp

0000000000400654 <__do_global_ctors_aux+0x4> push %rbx

0000000000400655 <__do_global_ctors_aux+0x5> mov $0x600778,%ebx

000000000040065a <__do_global_ctors_aux+0xa> sub $0x8,%rsp

000000000040065e <__do_global_ctors_aux+0xe> mov 2097427(%rip),%rax # 0000000000600778 <__CTOR_LIST__>

0000000000400665 <__do_global_ctors_aux+0x15> cmp $0xffffffffffffffff,%rax

0000000000400669 <__do_global_ctors_aux+0x19> je 000000000040067f <__do_global_ctors_aux+0x2f>

000000000040066b <__do_global_ctors_aux+0x1b> nopl 0x0(%rax,%rax,1)

0000000000400670 <__do_global_ctors_aux+0x20> sub $0x8,%rbx

0000000000400674 <__do_global_ctors_aux+0x24> callq *%rax

0000000000400676 <__do_global_ctors_aux+0x26> mov (%rbx),%rax

0000000000400679 <__do_global_ctors_aux+0x29> cmp $0xffffffffffffffff,%rax

000000000040067d <__do_global_ctors_aux+0x2d> jne 0000000000400670 <__do_global_ctors_aux+0x20>

000000000040067f <__do_global_ctors_aux+0x2f> add $0x8,%rsp

0000000000400683 <__do_global_ctors_aux+0x33> pop %rbx

0000000000400684 <__do_global_ctors_aux+0x34> leaveq

0000000000400685 <__do_global_ctors_aux+0x35> retq

0000000000400686 <__do_global_ctors_aux+0x36> nop

0000000000400687 <__do_global_ctors_aux+0x37> nop

[root@Betty Cpp]#

反汇编输出 .text 中所有 section 的信息。

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[root@Betty Cpp]# objdump -j .text -Dl objtest

objtest: file format elf64-x86-64

Disassembly of section .text:

00000000004004a0 <_start>:

_start():

4004a0: 31 ed xor %ebp,%ebp

4004a2: 49 89 d1 mov %rdx,%r9

4004a5: 5e pop %rsi

4004a6: 48 89 e2 mov %rsp,%rdx

4004a9: 48 83 e4 f0 and $0xfffffffffffffff0,%rsp

4004ad: 50 push %rax

4004ae: 54 push %rsp

4004af: 49 c7 c0 b0 05 40 00 mov $0x4005b0,%r8

4004b6: 48 c7 c1 c0 05 40 00 mov $0x4005c0,%rcx

4004bd: 48 c7 c7 78 05 40 00 mov $0x400578,%rdi

4004c4: e8 af ff ff ff callq 400478 <__libc_start_main@plt>

4004c9: f4 hlt

4004ca: 90 nop

4004cb: 90 nop

00000000004004cc <call_gmon_start>:

call_gmon_start():

4004cc: 48 83 ec 08 sub $0x8,%rsp

4004d0: 48 8b 05 89 04 20 00 mov 2098313(%rip),%rax # 600960 <_DYNAMIC+0x1c0>

4004d7: 48 85 c0 test %rax,%rax

4004da: 74 02 je 4004de <call_gmon_start+0x12>

4004dc: ff d0 callq *%rax

4004de: 48 83 c4 08 add $0x8,%rsp

4004e2: c3 retq

4004e3: 90 nop

4004e4: 90 nop

4004e5: 90 nop

4004e6: 90 nop

4004e7: 90 nop

4004e8: 90 nop

4004e9: 90 nop

4004ea: 90 nop

4004eb: 90 nop

4004ec: 90 nop

4004ed: 90 nop

4004ee: 90 nop

4004ef: 90 nop

00000000004004f0 <__do_global_dtors_aux>:

__do_global_dtors_aux():

4004f0: 55 push %rbp

4004f1: 48 89 e5 mov %rsp,%rbp

4004f4: 53 push %rbx

4004f5: 48 83 ec 08 sub $0x8,%rsp

4004f9: 80 3d a8 04 20 00 00 cmpb $0x0,2098344(%rip) # 6009a8 <completed.6145>

400500: 75 44 jne 400546 <__do_global_dtors_aux+0x56>

400502: b8 90 07 60 00 mov $0x600790,%eax

400507: 48 2d 88 07 60 00 sub $0x600788,%rax

40050d: 48 c1 f8 03 sar $0x3,%rax

400511: 48 8d 58 ff lea 0xffffffffffffffff(%rax),%rbx

400515: 48 8b 05 84 04 20 00 mov 2098308(%rip),%rax # 6009a0 <dtor_idx.6147>

40051c: 48 39 c3 cmp %rax,%rbx

40051f: 76 1e jbe 40053f <__do_global_dtors_aux+0x4f>

400521: 48 83 c0 01 add $0x1,%rax

400525: 48 89 05 74 04 20 00 mov %rax,2098292(%rip) # 6009a0 <dtor_idx.6147>

40052c: ff 14 c5 88 07 60 00 callq *0x600788(,%rax,8)

400533: 48 8b 05 66 04 20 00 mov 2098278(%rip),%rax # 6009a0 <dtor_idx.6147>

40053a: 48 39 c3 cmp %rax,%rbx

40053d: 77 e2 ja 400521 <__do_global_dtors_aux+0x31>

40053f: c6 05 62 04 20 00 01 movb $0x1,2098274(%rip) # 6009a8 <completed.6145>

400546: 48 83 c4 08 add $0x8,%rsp

40054a: 5b pop %rbx

40054b: c9 leaveq

40054c: c3 retq

40054d: 0f 1f 00 nopl (%rax)

0000000000400550 <frame_dummy>:

frame_dummy():

400550: 55 push %rbp

400551: 48 83 3d 3f 02 20 00 cmpq $0x0,2097727(%rip) # 600798 <__JCR_END__>

400558: 00

400559: 48 89 e5 mov %rsp,%rbp

40055c: 74 16 je 400574 <frame_dummy+0x24>

40055e: b8 00 00 00 00 mov $0x0,%eax

400563: 48 85 c0 test %rax,%rax

400566: 74 0c je 400574 <frame_dummy+0x24>

400568: bf 98 07 60 00 mov $0x600798,%edi

40056d: 49 89 c3 mov %rax,%r11

400570: c9 leaveq

400571: 41 ff e3 jmpq *%r11

400574: c9 leaveq

400575: c3 retq

400576: 90 nop

400577: 90 nop

0000000000400578 <main>:

main():

/root/workstation/CODE_TEST/Cpp/objtest.c:5

400578: 55 push %rbp

400579: 48 89 e5 mov %rsp,%rbp

40057c: 48 83 ec 10 sub $0x10,%rsp

400580: 89 7d fc mov %edi,0xfffffffffffffffc(%rbp)

400583: 48 89 75 f0 mov %rsi,0xfffffffffffffff0(%rbp)

/root/workstation/CODE_TEST/Cpp/objtest.c:7

400587: b9 00 00 00 00 mov $0x0,%ecx

40058c: ba a8 06 40 00 mov $0x4006a8,%edx

400591: be ab 06 40 00 mov $0x4006ab,%esi

400596: bf ab 06 40 00 mov $0x4006ab,%edi

40059b: b8 00 00 00 00 mov $0x0,%eax

4005a0: e8 c3 fe ff ff callq 400468 <execl@plt>

/root/workstation/CODE_TEST/Cpp/objtest.c:8

4005a5: b8 00 00 00 00 mov $0x0,%eax

/root/workstation/CODE_TEST/Cpp/objtest.c:9

4005aa: c9 leaveq

4005ab: c3 retq

4005ac: 90 nop

4005ad: 90 nop

4005ae: 90 nop

4005af: 90 nop

00000000004005b0 <__libc_csu_fini>:

__libc_csu_fini():

4005b0: f3 c3 repz retq

4005b2: 0f 1f 80 00 00 00 00 nopl 0x0(%rax)

4005b9: 0f 1f 80 00 00 00 00 nopl 0x0(%rax)

00000000004005c0 <__libc_csu_init>:

__libc_csu_init():

4005c0: 4c 89 64 24 e0 mov %r12,0xffffffffffffffe0(%rsp)

4005c5: 4c 89 6c 24 e8 mov %r13,0xffffffffffffffe8(%rsp)

4005ca: 4c 8d 25 a3 01 20 00 lea 2097571(%rip),%r12 # 600774 <__fini_array_end>

4005d1: 4c 89 74 24 f0 mov %r14,0xfffffffffffffff0(%rsp)

4005d6: 4c 89 7c 24 f8 mov %r15,0xfffffffffffffff8(%rsp)

4005db: 49 89 f6 mov %rsi,%r14

4005de: 48 89 5c 24 d0 mov %rbx,0xffffffffffffffd0(%rsp)

4005e3: 48 89 6c 24 d8 mov %rbp,0xffffffffffffffd8(%rsp)

4005e8: 48 83 ec 38 sub $0x38,%rsp

4005ec: 41 89 ff mov %edi,%r15d

4005ef: 49 89 d5 mov %rdx,%r13

4005f2: e8 49 fe ff ff callq 400440 <_init>

4005f7: 48 8d 05 76 01 20 00 lea 2097526(%rip),%rax # 600774 <__fini_array_end>

4005fe: 49 29 c4 sub %rax,%r12

400601: 49 c1 fc 03 sar $0x3,%r12

400605: 4d 85 e4 test %r12,%r12

400608: 74 1e je 400628 <__libc_csu_init+0x68>

40060a: 31 ed xor %ebp,%ebp

40060c: 48 89 c3 mov %rax,%rbx

40060f: 90 nop

400610: 48 83 c5 01 add $0x1,%rbp

400614: 4c 89 ea mov %r13,%rdx

400617: 4c 89 f6 mov %r14,%rsi

40061a: 44 89 ff mov %r15d,%edi

40061d: ff 13 callq *(%rbx)

40061f: 48 83 c3 08 add $0x8,%rbx

400623: 49 39 ec cmp %rbp,%r12

400626: 75 e8 jne 400610 <__libc_csu_init+0x50>

400628: 48 8b 5c 24 08 mov 0x8(%rsp),%rbx

40062d: 48 8b 6c 24 10 mov 0x10(%rsp),%rbp

400632: 4c 8b 64 24 18 mov 0x18(%rsp),%r12

400637: 4c 8b 6c 24 20 mov 0x20(%rsp),%r13

40063c: 4c 8b 74 24 28 mov 0x28(%rsp),%r14

400641: 4c 8b 7c 24 30 mov 0x30(%rsp),%r15

400646: 48 83 c4 38 add $0x38,%rsp

40064a: c3 retq

40064b: 90 nop

40064c: 90 nop

40064d: 90 nop

40064e: 90 nop

40064f: 90 nop

0000000000400650 <__do_global_ctors_aux>:

__do_global_ctors_aux():

400650: 55 push %rbp

400651: 48 89 e5 mov %rsp,%rbp

400654: 53 push %rbx

400655: bb 78 07 60 00 mov $0x600778,%ebx

40065a: 48 83 ec 08 sub $0x8,%rsp

40065e: 48 8b 05 13 01 20 00 mov 2097427(%rip),%rax # 600778 <__CTOR_LIST__>

400665: 48 83 f8 ff cmp $0xffffffffffffffff,%rax

400669: 74 14 je 40067f <__do_global_ctors_aux+0x2f>

40066b: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)

400670: 48 83 eb 08 sub $0x8,%rbx

400674: ff d0 callq *%rax

400676: 48 8b 03 mov (%rbx),%rax

400679: 48 83 f8 ff cmp $0xffffffffffffffff,%rax

40067d: 75 f1 jne 400670 <__do_global_ctors_aux+0x20>

40067f: 48 83 c4 08 add $0x8,%rsp

400683: 5b pop %rbx

400684: c9 leaveq

400685: c3 retq

400686: 90 nop

400687: 90 nop

[root@Betty Cpp]#

指定数据 .text 代码段的反汇编信息。

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[root@Betty Cpp]# objdump -j .text -S objtest

objtest: file format elf64-x86-64

Disassembly of section .text:

00000000004004a0 <_start>:

4004a0: 31 ed xor %ebp,%ebp

4004a2: 49 89 d1 mov %rdx,%r9

4004a5: 5e pop %rsi

4004a6: 48 89 e2 mov %rsp,%rdx

4004a9: 48 83 e4 f0 and $0xfffffffffffffff0,%rsp

4004ad: 50 push %rax

4004ae: 54 push %rsp

4004af: 49 c7 c0 b0 05 40 00 mov $0x4005b0,%r8

4004b6: 48 c7 c1 c0 05 40 00 mov $0x4005c0,%rcx

4004bd: 48 c7 c7 78 05 40 00 mov $0x400578,%rdi

4004c4: e8 af ff ff ff callq 400478 <__libc_start_main@plt>

4004c9: f4 hlt

4004ca: 90 nop

4004cb: 90 nop

00000000004004cc <call_gmon_start>:

4004cc: 48 83 ec 08 sub $0x8,%rsp

4004d0: 48 8b 05 89 04 20 00 mov 2098313(%rip),%rax # 600960 <_DYNAMIC+0x1c0>

4004d7: 48 85 c0 test %rax,%rax

4004da: 74 02 je 4004de <call_gmon_start+0x12>

4004dc: ff d0 callq *%rax

4004de: 48 83 c4 08 add $0x8,%rsp

4004e2: c3 retq

4004e3: 90 nop

4004e4: 90 nop

4004e5: 90 nop

4004e6: 90 nop

4004e7: 90 nop

4004e8: 90 nop

4004e9: 90 nop

4004ea: 90 nop

4004eb: 90 nop

4004ec: 90 nop

4004ed: 90 nop

4004ee: 90 nop

4004ef: 90 nop

00000000004004f0 <__do_global_dtors_aux>:

4004f0: 55 push %rbp

4004f1: 48 89 e5 mov %rsp,%rbp

4004f4: 53 push %rbx

4004f5: 48 83 ec 08 sub $0x8,%rsp

4004f9: 80 3d a8 04 20 00 00 cmpb $0x0,2098344(%rip) # 6009a8 <completed.6145>

400500: 75 44 jne 400546 <__do_global_dtors_aux+0x56>

400502: b8 90 07 60 00 mov $0x600790,%eax

400507: 48 2d 88 07 60 00 sub $0x600788,%rax

40050d: 48 c1 f8 03 sar $0x3,%rax

400511: 48 8d 58 ff lea 0xffffffffffffffff(%rax),%rbx

400515: 48 8b 05 84 04 20 00 mov 2098308(%rip),%rax # 6009a0 <dtor_idx.6147>

40051c: 48 39 c3 cmp %rax,%rbx

40051f: 76 1e jbe 40053f <__do_global_dtors_aux+0x4f>

400521: 48 83 c0 01 add $0x1,%rax

400525: 48 89 05 74 04 20 00 mov %rax,2098292(%rip) # 6009a0 <dtor_idx.6147>

40052c: ff 14 c5 88 07 60 00 callq *0x600788(,%rax,8)

400533: 48 8b 05 66 04 20 00 mov 2098278(%rip),%rax # 6009a0 <dtor_idx.6147>

40053a: 48 39 c3 cmp %rax,%rbx

40053d: 77 e2 ja 400521 <__do_global_dtors_aux+0x31>

40053f: c6 05 62 04 20 00 01 movb $0x1,2098274(%rip) # 6009a8 <completed.6145>

400546: 48 83 c4 08 add $0x8,%rsp

40054a: 5b pop %rbx

40054b: c9 leaveq

40054c: c3 retq

40054d: 0f 1f 00 nopl (%rax)

0000000000400550 <frame_dummy>:

400550: 55 push %rbp

400551: 48 83 3d 3f 02 20 00 cmpq $0x0,2097727(%rip) # 600798 <__JCR_END__>

400558: 00

400559: 48 89 e5 mov %rsp,%rbp

40055c: 74 16 je 400574 <frame_dummy+0x24>

40055e: b8 00 00 00 00 mov $0x0,%eax

400563: 48 85 c0 test %rax,%rax

400566: 74 0c je 400574 <frame_dummy+0x24>

400568: bf 98 07 60 00 mov $0x600798,%edi

40056d: 49 89 c3 mov %rax,%r11

400570: c9 leaveq

400571: 41 ff e3 jmpq *%r11

400574: c9 leaveq

400575: c3 retq

400576: 90 nop

400577: 90 nop

0000000000400578 <main>:

/*

g++ -g -Wstrict-prototypes -Wall -Wunused -o objtest objtest.c

*/

#include <unistd.h>

int main ( int argc, char * argv[] )

400578: 55 push %rbp

400579: 48 89 e5 mov %rsp,%rbp

40057c: 48 83 ec 10 sub $0x10,%rsp

400580: 89 7d fc mov %edi,0xfffffffffffffffc(%rbp)

400583: 48 89 75 f0 mov %rsi,0xfffffffffffffff0(%rbp)

{

execl( "/bin/sh", "/bin/sh", "-i", 0 );

400587: b9 00 00 00 00 mov $0x0,%ecx

40058c: ba a8 06 40 00 mov $0x4006a8,%edx

400591: be ab 06 40 00 mov $0x4006ab,%esi

400596: bf ab 06 40 00 mov $0x4006ab,%edi

40059b: b8 00 00 00 00 mov $0x0,%eax

4005a0: e8 c3 fe ff ff callq 400468 <execl@plt>

return 0;

4005a5: b8 00 00 00 00 mov $0x0,%eax

}

4005aa: c9 leaveq

4005ab: c3 retq

4005ac: 90 nop

4005ad: 90 nop

4005ae: 90 nop

4005af: 90 nop

00000000004005b0 <__libc_csu_fini>:

4005b0: f3 c3 repz retq

4005b2: 0f 1f 80 00 00 00 00 nopl 0x0(%rax)

4005b9: 0f 1f 80 00 00 00 00 nopl 0x0(%rax)

00000000004005c0 <__libc_csu_init>:

4005c0: 4c 89 64 24 e0 mov %r12,0xffffffffffffffe0(%rsp)

4005c5: 4c 89 6c 24 e8 mov %r13,0xffffffffffffffe8(%rsp)

4005ca: 4c 8d 25 a3 01 20 00 lea 2097571(%rip),%r12 # 600774 <__fini_array_end>

4005d1: 4c 89 74 24 f0 mov %r14,0xfffffffffffffff0(%rsp)

4005d6: 4c 89 7c 24 f8 mov %r15,0xfffffffffffffff8(%rsp)

4005db: 49 89 f6 mov %rsi,%r14

4005de: 48 89 5c 24 d0 mov %rbx,0xffffffffffffffd0(%rsp)

4005e3: 48 89 6c 24 d8 mov %rbp,0xffffffffffffffd8(%rsp)

4005e8: 48 83 ec 38 sub $0x38,%rsp

4005ec: 41 89 ff mov %edi,%r15d

4005ef: 49 89 d5 mov %rdx,%r13

4005f2: e8 49 fe ff ff callq 400440 <_init>

4005f7: 48 8d 05 76 01 20 00 lea 2097526(%rip),%rax # 600774 <__fini_array_end>

4005fe: 49 29 c4 sub %rax,%r12

400601: 49 c1 fc 03 sar $0x3,%r12

400605: 4d 85 e4 test %r12,%r12

400608: 74 1e je 400628 <__libc_csu_init+0x68>

40060a: 31 ed xor %ebp,%ebp

40060c: 48 89 c3 mov %rax,%rbx

40060f: 90 nop

400610: 48 83 c5 01 add $0x1,%rbp

400614: 4c 89 ea mov %r13,%rdx

400617: 4c 89 f6 mov %r14,%rsi

40061a: 44 89 ff mov %r15d,%edi

40061d: ff 13 callq *(%rbx)

40061f: 48 83 c3 08 add $0x8,%rbx

400623: 49 39 ec cmp %rbp,%r12

400626: 75 e8 jne 400610 <__libc_csu_init+0x50>

400628: 48 8b 5c 24 08 mov 0x8(%rsp),%rbx

40062d: 48 8b 6c 24 10 mov 0x10(%rsp),%rbp

400632: 4c 8b 64 24 18 mov 0x18(%rsp),%r12

400637: 4c 8b 6c 24 20 mov 0x20(%rsp),%r13

40063c: 4c 8b 74 24 28 mov 0x28(%rsp),%r14

400641: 4c 8b 7c 24 30 mov 0x30(%rsp),%r15

400646: 48 83 c4 38 add $0x38,%rsp

40064a: c3 retq

40064b: 90 nop

40064c: 90 nop

40064d: 90 nop

40064e: 90 nop

40064f: 90 nop

0000000000400650 <__do_global_ctors_aux>:

400650: 55 push %rbp

400651: 48 89 e5 mov %rsp,%rbp

400654: 53 push %rbx

400655: bb 78 07 60 00 mov $0x600778,%ebx

40065a: 48 83 ec 08 sub $0x8,%rsp

40065e: 48 8b 05 13 01 20 00 mov 2097427(%rip),%rax # 600778 <__CTOR_LIST__>

400665: 48 83 f8 ff cmp $0xffffffffffffffff,%rax

400669: 74 14 je 40067f <__do_global_ctors_aux+0x2f>

40066b: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)

400670: 48 83 eb 08 sub $0x8,%rbx

400674: ff d0 callq *%rax

400676: 48 8b 03 mov (%rbx),%rax

400679: 48 83 f8 ff cmp $0xffffffffffffffff,%rax

40067d: 75 f1 jne 400670 <__do_global_ctors_aux+0x20>

40067f: 48 83 c4 08 add $0x8,%rsp

400683: 5b pop %rbx

400684: c9 leaveq

400685: c3 retq

400686: 90 nop

400687: 90 nop

[root@Betty Cpp]#

未设置 -g 参数，并使用了 -O3 参数得到的 obj 文件反汇编后信息量非常少。

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[root@Betty Cpp]#

[root@Betty Cpp]# g++ -O3 -o objtest objtest.c

[root@Betty Cpp]#

[root@Betty Cpp]# objdump -j .text -S objtest

objtest: file format elf64-x86-64

Disassembly of section .text:

00000000004004a0 <_start>:

4004a0: 31 ed xor %ebp,%ebp

4004a2: 49 89 d1 mov %rdx,%r9

4004a5: 5e pop %rsi

4004a6: 48 89 e2 mov %rsp,%rdx

4004a9: 48 83 e4 f0 and $0xfffffffffffffff0,%rsp

4004ad: 50 push %rax

4004ae: 54 push %rsp

4004af: 49 c7 c0 b0 05 40 00 mov $0x4005b0,%r8

4004b6: 48 c7 c1 c0 05 40 00 mov $0x4005c0,%rcx

4004bd: 48 c7 c7 80 05 40 00 mov $0x400580,%rdi

4004c4: e8 af ff ff ff callq 400478 <__libc_start_main@plt>

4004c9: f4 hlt

4004ca: 90 nop

4004cb: 90 nop

00000000004004cc <call_gmon_start>:

4004cc: 48 83 ec 08 sub $0x8,%rsp

4004d0: 48 8b 05 81 04 20 00 mov 2098305(%rip),%rax # 600958 <_DYNAMIC+0x1c0>

4004d7: 48 85 c0 test %rax,%rax

4004da: 74 02 je 4004de <call_gmon_start+0x12>

4004dc: ff d0 callq *%rax

4004de: 48 83 c4 08 add $0x8,%rsp

4004e2: c3 retq

4004e3: 90 nop

4004e4: 90 nop

4004e5: 90 nop

4004e6: 90 nop

4004e7: 90 nop

4004e8: 90 nop

4004e9: 90 nop

4004ea: 90 nop

4004eb: 90 nop

4004ec: 90 nop

4004ed: 90 nop

4004ee: 90 nop

4004ef: 90 nop

00000000004004f0 <__do_global_dtors_aux>:

4004f0: 55 push %rbp

4004f1: 48 89 e5 mov %rsp,%rbp

4004f4: 53 push %rbx

4004f5: 48 83 ec 08 sub $0x8,%rsp

4004f9: 80 3d a0 04 20 00 00 cmpb $0x0,2098336(%rip) # 6009a0 <completed.6145>

400500: 75 44 jne 400546 <__do_global_dtors_aux+0x56>

400502: b8 88 07 60 00 mov $0x600788,%eax

400507: 48 2d 80 07 60 00 sub $0x600780,%rax

40050d: 48 c1 f8 03 sar $0x3,%rax

400511: 48 8d 58 ff lea 0xffffffffffffffff(%rax),%rbx

400515: 48 8b 05 7c 04 20 00 mov 2098300(%rip),%rax # 600998 <dtor_idx.6147>

40051c: 48 39 c3 cmp %rax,%rbx

40051f: 76 1e jbe 40053f <__do_global_dtors_aux+0x4f>

400521: 48 83 c0 01 add $0x1,%rax

400525: 48 89 05 6c 04 20 00 mov %rax,2098284(%rip) # 600998 <dtor_idx.6147>

40052c: ff 14 c5 80 07 60 00 callq *0x600780(,%rax,8)

400533: 48 8b 05 5e 04 20 00 mov 2098270(%rip),%rax # 600998 <dtor_idx.6147>

40053a: 48 39 c3 cmp %rax,%rbx

40053d: 77 e2 ja 400521 <__do_global_dtors_aux+0x31>

40053f: c6 05 5a 04 20 00 01 movb $0x1,2098266(%rip) # 6009a0 <completed.6145>

400546: 48 83 c4 08 add $0x8,%rsp

40054a: 5b pop %rbx

40054b: c9 leaveq

40054c: c3 retq

40054d: 0f 1f 00 nopl (%rax)

0000000000400550 <frame_dummy>:

400550: 55 push %rbp

400551: 48 83 3d 37 02 20 00 cmpq $0x0,2097719(%rip) # 600790 <__JCR_END__>

400558: 00

400559: 48 89 e5 mov %rsp,%rbp

40055c: 74 16 je 400574 <frame_dummy+0x24>

40055e: b8 00 00 00 00 mov $0x0,%eax

400563: 48 85 c0 test %rax,%rax

400566: 74 0c je 400574 <frame_dummy+0x24>

400568: bf 90 07 60 00 mov $0x600790,%edi

40056d: 49 89 c3 mov %rax,%r11

400570: c9 leaveq

400571: 41 ff e3 jmpq *%r11

400574: c9 leaveq

400575: c3 retq

400576: 90 nop

400577: 90 nop

400578: 90 nop

400579: 90 nop

40057a: 90 nop

40057b: 90 nop

40057c: 90 nop

40057d: 90 nop

40057e: 90 nop

40057f: 90 nop

0000000000400580 <main>:

400580: be ab 06 40 00 mov $0x4006ab,%esi

400585: 48 83 ec 08 sub $0x8,%rsp

400589: 31 c9 xor %ecx,%ecx

40058b: ba a8 06 40 00 mov $0x4006a8,%edx

400590: 48 89 f7 mov %rsi,%rdi

400593: 31 c0 xor %eax,%eax

400595: e8 ce fe ff ff callq 400468 <execl@plt>

40059a: 31 c0 xor %eax,%eax

40059c: 48 83 c4 08 add $0x8,%rsp

4005a0: c3 retq

4005a1: 90 nop

4005a2: 90 nop

4005a3: 90 nop

4005a4: 90 nop

4005a5: 90 nop

4005a6: 90 nop

4005a7: 90 nop

4005a8: 90 nop

4005a9: 90 nop

4005aa: 90 nop

4005ab: 90 nop

4005ac: 90 nop

4005ad: 90 nop

4005ae: 90 nop

4005af: 90 nop

00000000004005b0 <__libc_csu_fini>:

4005b0: f3 c3 repz retq

4005b2: 0f 1f 80 00 00 00 00 nopl 0x0(%rax)

4005b9: 0f 1f 80 00 00 00 00 nopl 0x0(%rax)

00000000004005c0 <__libc_csu_init>:

4005c0: 4c 89 64 24 e0 mov %r12,0xffffffffffffffe0(%rsp)

4005c5: 4c 89 6c 24 e8 mov %r13,0xffffffffffffffe8(%rsp)

4005ca: 4c 8d 25 9b 01 20 00 lea 2097563(%rip),%r12 # 60076c <__fini_array_end>

4005d1: 4c 89 74 24 f0 mov %r14,0xfffffffffffffff0(%rsp)

4005d6: 4c 89 7c 24 f8 mov %r15,0xfffffffffffffff8(%rsp)

4005db: 49 89 f6 mov %rsi,%r14

4005de: 48 89 5c 24 d0 mov %rbx,0xffffffffffffffd0(%rsp)

4005e3: 48 89 6c 24 d8 mov %rbp,0xffffffffffffffd8(%rsp)

4005e8: 48 83 ec 38 sub $0x38,%rsp

4005ec: 41 89 ff mov %edi,%r15d

4005ef: 49 89 d5 mov %rdx,%r13

4005f2: e8 49 fe ff ff callq 400440 <_init>

4005f7: 48 8d 05 6e 01 20 00 lea 2097518(%rip),%rax # 60076c <__fini_array_end>

4005fe: 49 29 c4 sub %rax,%r12

400601: 49 c1 fc 03 sar $0x3,%r12

400605: 4d 85 e4 test %r12,%r12

400608: 74 1e je 400628 <__libc_csu_init+0x68>

40060a: 31 ed xor %ebp,%ebp

40060c: 48 89 c3 mov %rax,%rbx

40060f: 90 nop

400610: 48 83 c5 01 add $0x1,%rbp

400614: 4c 89 ea mov %r13,%rdx

400617: 4c 89 f6 mov %r14,%rsi

40061a: 44 89 ff mov %r15d,%edi

40061d: ff 13 callq *(%rbx)

40061f: 48 83 c3 08 add $0x8,%rbx

400623: 49 39 ec cmp %rbp,%r12

400626: 75 e8 jne 400610 <__libc_csu_init+0x50>

400628: 48 8b 5c 24 08 mov 0x8(%rsp),%rbx

40062d: 48 8b 6c 24 10 mov 0x10(%rsp),%rbp

400632: 4c 8b 64 24 18 mov 0x18(%rsp),%r12

400637: 4c 8b 6c 24 20 mov 0x20(%rsp),%r13

40063c: 4c 8b 74 24 28 mov 0x28(%rsp),%r14

400641: 4c 8b 7c 24 30 mov 0x30(%rsp),%r15

400646: 48 83 c4 38 add $0x38,%rsp

40064a: c3 retq

40064b: 90 nop

40064c: 90 nop

40064d: 90 nop

40064e: 90 nop

40064f: 90 nop

0000000000400650 <__do_global_ctors_aux>:

400650: 55 push %rbp

400651: 48 89 e5 mov %rsp,%rbp

400654: 53 push %rbx

400655: bb 70 07 60 00 mov $0x600770,%ebx

40065a: 48 83 ec 08 sub $0x8,%rsp

40065e: 48 8b 05 0b 01 20 00 mov 2097419(%rip),%rax # 600770 <__CTOR_LIST__>

400665: 48 83 f8 ff cmp $0xffffffffffffffff,%rax

400669: 74 14 je 40067f <__do_global_ctors_aux+0x2f>

40066b: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)

400670: 48 83 eb 08 sub $0x8,%rbx

400674: ff d0 callq *%rax

400676: 48 8b 03 mov (%rbx),%rax

400679: 48 83 f8 ff cmp $0xffffffffffffffff,%rax

40067d: 75 f1 jne 400670 <__do_global_ctors_aux+0x20>

40067f: 48 83 c4 08 add $0x8,%rsp

400683: 5b pop %rbx

400684: c9 leaveq

400685: c3 retq

400686: 90 nop

400687: 90 nop

[root@Betty Cpp]#

增加 -l 参数没有多出任何有用信息。

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[root@Betty Cpp]# objdump -j .text -Sl objtest

objtest: file format elf64-x86-64

Disassembly of section .text:

00000000004004a0 <_start>:

_start():

4004a0: 31 ed xor %ebp,%ebp

4004a2: 49 89 d1 mov %rdx,%r9

4004a5: 5e pop %rsi

4004a6: 48 89 e2 mov %rsp,%rdx

4004a9: 48 83 e4 f0 and $0xfffffffffffffff0,%rsp

4004ad: 50 push %rax

4004ae: 54 push %rsp

4004af: 49 c7 c0 b0 05 40 00 mov $0x4005b0,%r8

4004b6: 48 c7 c1 c0 05 40 00 mov $0x4005c0,%rcx

4004bd: 48 c7 c7 80 05 40 00 mov $0x400580,%rdi

4004c4: e8 af ff ff ff callq 400478 <__libc_start_main@plt>

4004c9: f4 hlt

4004ca: 90 nop

4004cb: 90 nop

00000000004004cc <call_gmon_start>:

call_gmon_start():

4004cc: 48 83 ec 08 sub $0x8,%rsp

4004d0: 48 8b 05 81 04 20 00 mov 2098305(%rip),%rax # 600958 <_DYNAMIC+0x1c0>

4004d7: 48 85 c0 test %rax,%rax

4004da: 74 02 je 4004de <call_gmon_start+0x12>

4004dc: ff d0 callq *%rax

4004de: 48 83 c4 08 add $0x8,%rsp

4004e2: c3 retq

4004e3: 90 nop

4004e4: 90 nop

4004e5: 90 nop

4004e6: 90 nop

4004e7: 90 nop

4004e8: 90 nop

4004e9: 90 nop

4004ea: 90 nop

4004eb: 90 nop

4004ec: 90 nop

4004ed: 90 nop

4004ee: 90 nop

4004ef: 90 nop

00000000004004f0 <__do_global_dtors_aux>:

__do_global_dtors_aux():

4004f0: 55 push %rbp

4004f1: 48 89 e5 mov %rsp,%rbp

4004f4: 53 push %rbx

4004f5: 48 83 ec 08 sub $0x8,%rsp

4004f9: 80 3d a0 04 20 00 00 cmpb $0x0,2098336(%rip) # 6009a0 <completed.6145>

400500: 75 44 jne 400546 <__do_global_dtors_aux+0x56>

400502: b8 88 07 60 00 mov $0x600788,%eax

400507: 48 2d 80 07 60 00 sub $0x600780,%rax

40050d: 48 c1 f8 03 sar $0x3,%rax

400511: 48 8d 58 ff lea 0xffffffffffffffff(%rax),%rbx

400515: 48 8b 05 7c 04 20 00 mov 2098300(%rip),%rax # 600998 <dtor_idx.6147>

40051c: 48 39 c3 cmp %rax,%rbx

40051f: 76 1e jbe 40053f <__do_global_dtors_aux+0x4f>

400521: 48 83 c0 01 add $0x1,%rax

400525: 48 89 05 6c 04 20 00 mov %rax,2098284(%rip) # 600998 <dtor_idx.6147>

40052c: ff 14 c5 80 07 60 00 callq *0x600780(,%rax,8)

400533: 48 8b 05 5e 04 20 00 mov 2098270(%rip),%rax # 600998 <dtor_idx.6147>

40053a: 48 39 c3 cmp %rax,%rbx

40053d: 77 e2 ja 400521 <__do_global_dtors_aux+0x31>

40053f: c6 05 5a 04 20 00 01 movb $0x1,2098266(%rip) # 6009a0 <completed.6145>

400546: 48 83 c4 08 add $0x8,%rsp

40054a: 5b pop %rbx

40054b: c9 leaveq

40054c: c3 retq

40054d: 0f 1f 00 nopl (%rax)

0000000000400550 <frame_dummy>:

frame_dummy():

400550: 55 push %rbp

400551: 48 83 3d 37 02 20 00 cmpq $0x0,2097719(%rip) # 600790 <__JCR_END__>

400558: 00

400559: 48 89 e5 mov %rsp,%rbp

40055c: 74 16 je 400574 <frame_dummy+0x24>

40055e: b8 00 00 00 00 mov $0x0,%eax

400563: 48 85 c0 test %rax,%rax

400566: 74 0c je 400574 <frame_dummy+0x24>

400568: bf 90 07 60 00 mov $0x600790,%edi

40056d: 49 89 c3 mov %rax,%r11

400570: c9 leaveq

400571: 41 ff e3 jmpq *%r11

400574: c9 leaveq

400575: c3 retq

400576: 90 nop

400577: 90 nop

400578: 90 nop

400579: 90 nop

40057a: 90 nop

40057b: 90 nop

40057c: 90 nop

40057d: 90 nop

40057e: 90 nop

40057f: 90 nop

0000000000400580 <main>:

main():

400580: be ab 06 40 00 mov $0x4006ab,%esi

400585: 48 83 ec 08 sub $0x8,%rsp

400589: 31 c9 xor %ecx,%ecx

40058b: ba a8 06 40 00 mov $0x4006a8,%edx

400590: 48 89 f7 mov %rsi,%rdi

400593: 31 c0 xor %eax,%eax

400595: e8 ce fe ff ff callq 400468 <execl@plt>

40059a: 31 c0 xor %eax,%eax

40059c: 48 83 c4 08 add $0x8,%rsp

4005a0: c3 retq

4005a1: 90 nop

4005a2: 90 nop

4005a3: 90 nop

4005a4: 90 nop

4005a5: 90 nop

4005a6: 90 nop

4005a7: 90 nop

4005a8: 90 nop

4005a9: 90 nop

4005aa: 90 nop

4005ab: 90 nop

4005ac: 90 nop

4005ad: 90 nop

4005ae: 90 nop

4005af: 90 nop

00000000004005b0 <__libc_csu_fini>:

__libc_csu_fini():

4005b0: f3 c3 repz retq

4005b2: 0f 1f 80 00 00 00 00 nopl 0x0(%rax)

4005b9: 0f 1f 80 00 00 00 00 nopl 0x0(%rax)

00000000004005c0 <__libc_csu_init>:

__libc_csu_init():

4005c0: 4c 89 64 24 e0 mov %r12,0xffffffffffffffe0(%rsp)

4005c5: 4c 89 6c 24 e8 mov %r13,0xffffffffffffffe8(%rsp)

4005ca: 4c 8d 25 9b 01 20 00 lea 2097563(%rip),%r12 # 60076c <__fini_array_end>

4005d1: 4c 89 74 24 f0 mov %r14,0xfffffffffffffff0(%rsp)

4005d6: 4c 89 7c 24 f8 mov %r15,0xfffffffffffffff8(%rsp)

4005db: 49 89 f6 mov %rsi,%r14

4005de: 48 89 5c 24 d0 mov %rbx,0xffffffffffffffd0(%rsp)

4005e3: 48 89 6c 24 d8 mov %rbp,0xffffffffffffffd8(%rsp)

4005e8: 48 83 ec 38 sub $0x38,%rsp

4005ec: 41 89 ff mov %edi,%r15d

4005ef: 49 89 d5 mov %rdx,%r13

4005f2: e8 49 fe ff ff callq 400440 <_init>

4005f7: 48 8d 05 6e 01 20 00 lea 2097518(%rip),%rax # 60076c <__fini_array_end>

4005fe: 49 29 c4 sub %rax,%r12

400601: 49 c1 fc 03 sar $0x3,%r12

400605: 4d 85 e4 test %r12,%r12

400608: 74 1e je 400628 <__libc_csu_init+0x68>

40060a: 31 ed xor %ebp,%ebp

40060c: 48 89 c3 mov %rax,%rbx

40060f: 90 nop

400610: 48 83 c5 01 add $0x1,%rbp

400614: 4c 89 ea mov %r13,%rdx

400617: 4c 89 f6 mov %r14,%rsi

40061a: 44 89 ff mov %r15d,%edi

40061d: ff 13 callq *(%rbx)

40061f: 48 83 c3 08 add $0x8,%rbx

400623: 49 39 ec cmp %rbp,%r12

400626: 75 e8 jne 400610 <__libc_csu_init+0x50>

400628: 48 8b 5c 24 08 mov 0x8(%rsp),%rbx

40062d: 48 8b 6c 24 10 mov 0x10(%rsp),%rbp

400632: 4c 8b 64 24 18 mov 0x18(%rsp),%r12

400637: 4c 8b 6c 24 20 mov 0x20(%rsp),%r13

40063c: 4c 8b 74 24 28 mov 0x28(%rsp),%r14

400641: 4c 8b 7c 24 30 mov 0x30(%rsp),%r15

400646: 48 83 c4 38 add $0x38,%rsp

40064a: c3 retq

40064b: 90 nop

40064c: 90 nop

40064d: 90 nop

40064e: 90 nop

40064f: 90 nop

0000000000400650 <__do_global_ctors_aux>:

__do_global_ctors_aux():

400650: 55 push %rbp

400651: 48 89 e5 mov %rsp,%rbp

400654: 53 push %rbx

400655: bb 70 07 60 00 mov $0x600770,%ebx

40065a: 48 83 ec 08 sub $0x8,%rsp

40065e: 48 8b 05 0b 01 20 00 mov 2097419(%rip),%rax # 600770 <__CTOR_LIST__>

400665: 48 83 f8 ff cmp $0xffffffffffffffff,%rax

400669: 74 14 je 40067f <__do_global_ctors_aux+0x2f>

40066b: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)

400670: 48 83 eb 08 sub $0x8,%rbx

400674: ff d0 callq *%rax

400676: 48 8b 03 mov (%rbx),%rax

400679: 48 83 f8 ff cmp $0xffffffffffffffff,%rax

40067d: 75 f1 jne 400670 <__do_global_ctors_aux+0x20>

40067f: 48 83 c4 08 add $0x8,%rsp

400683: 5b pop %rbx

400684: c9 leaveq

400685: c3 retq

400686: 90 nop

400687: 90 nop

[root@Betty Cpp]#

最后，附加几张反汇编内容的对比图片。

时间： 2024-08-31 08:10:04

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