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} markdown-style [type=search]::-webkit-search-cancel-button, markdown-style [type=search]::-webkit-search-decoration { -webkit-appearance: none; } markdown-style ::-webkit-input-placeholder { color: inherit; opacity: .54; } markdown-style ::-webkit-file-upload-button { -webkit-appearance: button; font: inherit; } markdown-style a:hover { text-decoration: underline; } markdown-style hr::before { display: table; content: ""; } markdown-style hr::after { display: table; clear: both; content: ""; } markdown-style table { border-spacing: 0; border-collapse: collapse; display: block; width: max-content; max-width: 100%; overflow: auto; } markdown-style td, markdown-style th { padding: 0; } markdown-style details summary { cursor: pointer; } markdown-style details:not([open])>*:not(summary) { display: none !important; } markdown-style kbd { display: inline-block; padding: 3px 5px; font: 11px ui-monospace,SFMono-Regular,SF Mono,Menlo,Consolas,Liberation Mono,monospace; line-height: 10px; color: var(--color-fg-default); vertical-align: middle; background-color: var(--color-canvas-subtle); border: solid 1px var(--color-neutral-muted); border-bottom-color: var(--color-neutral-muted); border-radius: 6px; box-shadow: inset 0 -1px 0 var(--color-neutral-muted); } markdown-style h1, markdown-style h2, markdown-style h3, markdown-style h4, markdown-style h5, markdown-style h6 { margin-top: 24px; margin-bottom: 16px; font-weight: 600; line-height: 1.25; } markdown-style h2 { font-weight: 600; padding-bottom: .3em; font-size: 1.5em; border-bottom: 1px solid var(--color-border-muted); } markdown-style h3 { font-weight: 600; font-size: 1.25em; } markdown-style h4 { font-weight: 600; font-size: 1em; } markdown-style h5 { font-weight: 600; font-size: .875em; } markdown-style h6 { font-weight: 600; font-size: .85em; color: var(--color-fg-muted); } markdown-style p { margin-top: 0; margin-bottom: 10px; } markdown-style blockquote { margin: 0; padding: 0 1em; color: var(--color-fg-muted); border-left: .25em solid var(--color-border-default); } markdown-style ul, markdown-style ol { margin-top: 0; margin-bottom: 0; padding-left: 2em; } markdown-style ol ol, markdown-style ul ol { list-style-type: lower-roman; } markdown-style ul ul ol, markdown-style ul ol ol, markdown-style ol ul ol, markdown-style ol ol ol { list-style-type: lower-alpha; } markdown-style dd { margin-left: 0; } markdown-style tt, markdown-style code { font-family: ui-monospace,SFMono-Regular,SF Mono,Menlo,Consolas,Liberation Mono,monospace; font-size: 12px; } markdown-style pre { margin-top: 0; margin-bottom: 0; font-family: ui-monospace,SFMono-Regular,SF Mono,Menlo,Consolas,Liberation Mono,monospace; font-size: 12px; word-wrap: normal; } markdown-style .octicon { display: inline-block; overflow: visible !important; vertical-align: text-bottom; fill: currentColor; } markdown-style ::placeholder { color: var(--color-fg-subtle); opacity: 1; } markdown-style input::-webkit-outer-spin-button, markdown-style input::-webkit-inner-spin-button { margin: 0; -webkit-appearance: none; appearance: none; }
|
||
markdown-style .token.comment, markdown-style .token.prolog, markdown-style .token.doctype, markdown-style .token.cdata { color: var(--color-prettylights-syntax-comment); } markdown-style .token.namespace { opacity: 0.7; } markdown-style .token.tag, markdown-style .token.selector, markdown-style .token.constant, markdown-style .token.symbol, markdown-style .token.deleted { color: var(--color-prettylights-syntax-entity-tag); } markdown-style .token.maybe-class-name { color: var(--color-prettylights-syntax-variable); } markdown-style .token.property-access, markdown-style .token.operator, markdown-style .token.boolean, markdown-style .token.number, markdown-style .token.selector markdown-style .token.class, markdown-style .token.attr-name, markdown-style .token.string, markdown-style .token.char, markdown-style .token.builtin { color: var(--color-prettylights-syntax-constant); } markdown-style .token.deleted { color: var(--color-prettylights-syntax-markup-deleted-text); } markdown-style .token.property { color: var(--color-prettylights-syntax-constant); } markdown-style .token.punctuation { color: var(--color-prettylights-syntax-markup-bold); } markdown-style .token.function { color: var(--color-prettylights-syntax-entity); } markdown-style .code-line .token.deleted { background-color: var(--color-prettylights-syntax-markup-deleted-bg); } markdown-style .token.inserted { color: var(--color-prettylights-syntax-markup-inserted-text); } markdown-style .code-line .token.inserted { background-color: var(--color-prettylights-syntax-markup-inserted-bg); } markdown-style .token.variable { color: var(--color-prettylights-syntax-constant); } markdown-style .token.entity, markdown-style .token.url, .language-css markdown-style .token.string, .style markdown-style .token.string { color: var(--color-prettylights-syntax-string); } markdown-style .token.color, markdown-style .token.atrule, markdown-style .token.attr-value, markdown-style .token.function, markdown-style .token.class-name { color: var(--color-prettylights-syntax-string); } markdown-style .token.rule, markdown-style .token.regex, markdown-style .token.important, markdown-style .token.keyword { color: var(--color-prettylights-syntax-keyword); } markdown-style .token.coord { color: var(--color-prettylights-syntax-meta-diff-range); } markdown-style .token.important, markdown-style .token.bold { font-weight: bold; } markdown-style .token.italic { font-style: italic; } markdown-style .token.entity { cursor: help; }
|
||
markdown-style [data-catalyst] { display: block; } markdown-style g-emoji { font-family: "Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol"; font-size: 1em; font-style: normal !important; font-weight: 400; line-height: 1; vertical-align: -0.075em; } markdown-style g-emoji img { width: 1em; height: 1em; } markdown-style::before { display: table; content: ""; } markdown-style::after { display: table; clear: both; content: ""; } markdown-style>*:first-child { margin-top: 0 !important; } markdown-style>*:last-child { margin-bottom: 0 !important; } markdown-style a:not([href]) { color: inherit; text-decoration: none; } markdown-style .absent { color: var(--color-danger-fg); } markdown-style a.anchor { float: left; padding-right: 4px; margin-left: -20px; line-height: 1; } markdown-style a.anchor:focus { outline: none; } markdown-style p, markdown-style blockquote, markdown-style ul, markdown-style ol, markdown-style dl, markdown-style table, markdown-style pre, markdown-style details { margin-top: 0; margin-bottom: 16px; } markdown-style blockquote>:first-child { margin-top: 0; } markdown-style blockquote>:last-child { margin-bottom: 0; } markdown-style sup>a::before { content: "["; } markdown-style sup>a::after { content: "]"; }
|
||
markdown-style .octicon-video { border: 1px solid #d0d7de !important; border-radius: 6px !important; display: block; } markdown-style .octicon-video summary { border-bottom: 1px solid #d0d7de !important; padding: 8px 16px !important; cursor: pointer; } markdown-style .octicon-video > video { display: block !important; max-width: 100% !important; padding: 2px; box-sizing: border-box; border-bottom-right-radius: 6px !important; border-bottom-left-radius: 6px !important; } markdown-style details.octicon-video:not([open])>*:not(summary) { display: none !important; } markdown-style details.octicon-video:not([open]) > summary { border-bottom: 0 !important; } markdown-style h1 .octicon-link, markdown-style h2 .octicon-link, markdown-style h3 .octicon-link, markdown-style h4 .octicon-link, markdown-style h5 .octicon-link, markdown-style h6 .octicon-link { color: var(--color-fg-default); vertical-align: middle; visibility: hidden; } markdown-style h1:hover .anchor, markdown-style h2:hover .anchor, markdown-style h3:hover .anchor, markdown-style h4:hover .anchor, markdown-style h5:hover .anchor, markdown-style h6:hover .anchor { text-decoration: none; } markdown-style h1:hover .anchor .octicon-link, markdown-style h2:hover .anchor .octicon-link, markdown-style h3:hover .anchor .octicon-link, markdown-style h4:hover .anchor .octicon-link, markdown-style h5:hover .anchor .octicon-link, markdown-style h6:hover .anchor .octicon-link { visibility: visible; } markdown-style h1 tt, markdown-style h1 code, markdown-style h2 tt, markdown-style h2 code, markdown-style h3 tt, markdown-style h3 code, markdown-style h4 tt, markdown-style h4 code, markdown-style h5 tt, markdown-style h5 code, markdown-style h6 tt, markdown-style h6 code { padding: 0 .2em; font-size: inherit; } markdown-style ul.no-list, markdown-style ol.no-list { padding: 0; list-style-type: none; } markdown-style ol[type="1"] { list-style-type: decimal; } markdown-style ol[type=a] { list-style-type: lower-alpha; } markdown-style ol[type=i] { list-style-type: lower-roman; } markdown-style div>ol:not([type]) { list-style-type: decimal; } markdown-style ul ul, markdown-style ul ol, markdown-style ol ol, markdown-style ol ul { margin-top: 0; margin-bottom: 0; } markdown-style li>p { margin-top: 16px; } markdown-style li+li { margin-top: .25em; } markdown-style dl { padding: 0; } markdown-style dl dt { padding: 0; margin-top: 16px; font-size: 1em; font-style: italic; font-weight: 600; } markdown-style dl dd { padding: 0 16px; margin-bottom: 16px; } markdown-style table th { font-weight: 600; } markdown-style table th, markdown-style table td { padding: 6px 13px; border: 1px solid var(--color-border-default); } markdown-style table tr { background-color: var(--color-canvas-default); border-top: 1px solid var(--color-border-muted); } markdown-style table tr:nth-child(2n) { background-color: var(--color-canvas-subtle); } markdown-style table img { background-color: transparent; vertical-align: middle; } markdown-style img[align=right] { padding-left: 20px; } markdown-style img[align=left] { padding-right: 20px; } markdown-style .emoji { max-width: none; vertical-align: text-top; background-color: transparent; } markdown-style span.frame { display: block; overflow: hidden; } markdown-style span.frame>span { display: block; float: left; width: auto; padding: 7px; margin: 13px 0 0; overflow: hidden; border: 1px solid var(--color-border-default); } markdown-style span.frame span img { display: block; float: left; } markdown-style span.frame span span { display: block; padding: 5px 0 0; clear: both; color: var(--color-fg-default); } markdown-style span.align-center { display: block; overflow: hidden; clear: both; } markdown-style span.align-center>span { display: block; margin: 13px auto 0; overflow: hidden; text-align: center; } markdown-style span.align-center span img { margin: 0 auto; text-align: center; } markdown-style span.align-right { display: block; overflow: hidden; clear: both; } markdown-style span.align-right>span { display: block; margin: 13px 0 0; overflow: hidden; text-align: right; } markdown-style span.align-right span img { margin: 0; text-align: right; } markdown-style span.float-left { display: block; float: left; margin-right: 13px; overflow: hidden; } markdown-style span.float-left span { margin: 13px 0 0; } markdown-style span.float-right { display: block; float: right; margin-left: 13px; overflow: hidden; } markdown-style span.float-right>span { display: block; margin: 13px auto 0; overflow: hidden; text-align: right; } markdown-style code, markdown-style tt { padding: .2em .4em; margin: 0; font-size: 85%; background-color: var(--color-neutral-muted); border-radius: 6px; } markdown-style code br, markdown-style tt br { display: none; } markdown-style del code { text-decoration: inherit; } markdown-style pre code { font-size: 100%; } markdown-style pre>code { padding: 0; margin: 0; word-break: normal; white-space: pre; background: transparent; border: 0; } markdown-style pre { position: relative; font-size: 85%; line-height: 1.45; background-color: var(--color-canvas-subtle); border-radius: 6px; } markdown-style pre code, markdown-style pre tt { display: inline; max-width: auto; padding: 0; margin: 0; overflow: visible; line-height: inherit; word-wrap: normal; background-color: transparent; border: 0; } markdown-style pre > code { padding: 16px; overflow: auto; display: block; } markdown-style .csv-data td, markdown-style .csv-data th { padding: 5px; overflow: hidden; font-size: 12px; line-height: 1; text-align: left; white-space: nowrap; } markdown-style .csv-data .blob-num { padding: 10px 8px 9px; text-align: right; background: var(--color-canvas-default); border: 0; } markdown-style .csv-data tr { border-top: 0; } markdown-style .csv-data th { font-weight: 600; background: var(--color-canvas-subtle); border-top: 0; } markdown-style .footnotes { font-size: 12px; color: var(--color-fg-muted); border-top: 1px solid var(--color-border-default); } markdown-style .footnotes ol { padding-left: 16px; } markdown-style .footnotes li { position: relative; } markdown-style .footnotes li:target::before { position: absolute; top: -8px; right: -8px; bottom: -8px; left: -24px; pointer-events: none; content: ""; border: 2px solid var(--color-accent-emphasis); border-radius: 6px; } markdown-style .footnotes li:target { color: var(--color-fg-default); } markdown-style .footnotes .data-footnote-backref g-emoji { font-family: monospace; } markdown-style .task-list-item { list-style-type: none; } markdown-style .task-list-item label { font-weight: 400; } markdown-style .task-list-item.enabled label { cursor: pointer; } markdown-style .task-list-item+.task-list-item { margin-top: 3px; } markdown-style .task-list-item .handle { display: none; } markdown-style .task-list-item-checkbox, markdown-style input[type="checkbox"] { margin: 0 .2em .25em -1.6em; vertical-align: middle; } markdown-style .contains-task-list:dir(rtl) .task-list-item-checkbox, markdown-style .contains-task-list:dir(rtl) input[type="checkbox"] { margin: 0 -1.6em .25em .2em; } markdown-style ::-webkit-calendar-picker-indicator { filter: invert(50%); }
|
||
</style>
|
||
<slot></slot>
|
||
`;
|
||
class MarkdownStyle extends HTMLElement {
|
||
constructor() {
|
||
super();
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||
this.shadow = this.attachShadow({ mode: 'open' });
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||
this.shadow.appendChild(__TEMPLATE__.content.cloneNode(true));
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||
const style = Array.prototype.slice
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||
.call(this.shadow.children)
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||
.find((item) => item.tagName === 'STYLE');
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||
if (style) {
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||
const id = '__MARKDOWN_STYLE__';
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||
const findStyle = document.getElementById(id);
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||
if (!findStyle) {
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||
style.id = id;
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||
document.head.append(style);
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||
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||
}
|
||
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||
get theme() {
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||
const value = this.getAttribute('theme');
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||
return value === null ? '' : value;
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||
}
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||
set theme(name) {
|
||
this.setAttribute('theme', name);
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||
}
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connectedCallback() {
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||
if (!this.theme) {
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||
const { colorMode } = document.documentElement.dataset;
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this.theme = colorMode;
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const observer = new MutationObserver((mutationsList, observer) => {
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||
this.theme = document.documentElement.dataset.colorMode;
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||
});
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||
observer.observe(document.documentElement, { attributes: true });
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||
window.matchMedia('(prefers-color-scheme: light)').onchange = (event) => {
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||
this.theme = event.matches ? 'light' : 'dark';
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||
};
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||
window.matchMedia('(prefers-color-scheme: dark)').onchange = (event) => {
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||
this.theme = event.matches ? 'dark' : 'light';
|
||
};
|
||
}
|
||
}
|
||
}
|
||
customElements.define('markdown-style', MarkdownStyle);</script><markdown-style style="max-width: 960px; margin: 0 auto 60px auto; padding: 8px;" class="markdown-style">
|
||
<h1 id="objdump"><a class="anchor" aria-hidden="true" tabindex="-1" href="#objdump"><span class="octicon octicon-link"></span></a>objdump</h1>
|
||
<p>显示二进制文件信息</p>
|
||
<h2 id="补充说明"><a class="anchor" aria-hidden="true" tabindex="-1" href="#补充说明"><span class="octicon octicon-link"></span></a>补充说明</h2>
|
||
<p><strong>objdump命令</strong> 是用查看目标文件或者可执行的目标文件的构成的gcc工具。</p>
|
||
<h3 id="选项"><a class="anchor" aria-hidden="true" tabindex="-1" href="#选项"><span class="octicon octicon-link"></span></a>选项</h3>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1"><span class="token parameter variable">-a</span> --archive-headers
|
||
</span><span class="code-line line-number" line="2"><span class="token comment"># 显示档案库的成员信息,类似ls -l将lib*.a的信息列出。 </span>
|
||
</span><span class="code-line line-number" line="3">
|
||
</span><span class="code-line line-number" line="4"><span class="token parameter variable">-b</span> bfdname <span class="token parameter variable">--target</span><span class="token operator">=</span>bfdname
|
||
</span><span class="code-line line-number" line="5"><span class="token comment"># 指定目标码格式。这不是必须的，objdump能自动识别许多格式，比如： </span>
|
||
</span><span class="code-line line-number" line="6">
|
||
</span><span class="code-line line-number" line="7">objdump <span class="token parameter variable">-b</span> oasys <span class="token parameter variable">-m</span> vax <span class="token parameter variable">-h</span> fu.o
|
||
</span><span class="code-line line-number" line="8"><span class="token comment"># 显示fu.o的头部摘要信息，明确指出该文件是Vax系统下用Oasys编译器生成的目标文件。objdump -i将给出这里可以指定的目标码格式列表。 </span>
|
||
</span><span class="code-line line-number" line="9">
|
||
</span><span class="code-line line-number" line="10"><span class="token parameter variable">-C</span> <span class="token parameter variable">--demangle</span>
|
||
</span><span class="code-line line-number" line="11"><span class="token comment"># 将底层的符号名解码成用户级名字，除了去掉所开头的下划线之外，还使得C++函数名以可理解的方式显示出来。 </span>
|
||
</span><span class="code-line line-number" line="12"><span class="token parameter variable">--debugging</span>
|
||
</span><span class="code-line line-number" line="13"><span class="token parameter variable">-g</span>
|
||
</span><span class="code-line line-number" line="14"><span class="token comment"># 显示调试信息。企图解析保存在文件中的调试信息并以C语言的语法显示出来。仅仅支持某些类型的调试信息。有些其他的格式被readelf -w支持。 </span>
|
||
</span><span class="code-line line-number" line="15">
|
||
</span><span class="code-line line-number" line="16"><span class="token parameter variable">-e</span> --debugging-tags
|
||
</span><span class="code-line line-number" line="17"><span class="token comment"># 类似-g选项，但是生成的信息是和ctags工具相兼容的格式。 </span>
|
||
</span><span class="code-line line-number" line="18"><span class="token parameter variable">--disassemble</span>
|
||
</span><span class="code-line line-number" line="19"><span class="token parameter variable">-d</span>
|
||
</span><span class="code-line line-number" line="20"><span class="token comment"># 从objfile中反汇编那些特定指令机器码的section。 </span>
|
||
</span><span class="code-line line-number" line="21">
|
||
</span><span class="code-line line-number" line="22"><span class="token parameter variable">-D</span> --disassemble-all
|
||
</span><span class="code-line line-number" line="23"><span class="token comment"># 与 -d 类似，但反汇编所有section. </span>
|
||
</span><span class="code-line line-number" line="24">
|
||
</span><span class="code-line line-number" line="25">--prefix-addresses
|
||
</span><span class="code-line line-number" line="26"><span class="token comment"># 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。 </span>
|
||
</span><span class="code-line line-number" line="27">
|
||
</span><span class="code-line line-number" line="28"><span class="token parameter variable">-EB</span>
|
||
</span><span class="code-line line-number" line="29"><span class="token parameter variable">-EL</span>
|
||
</span><span class="code-line line-number" line="30"><span class="token parameter variable">--endian</span><span class="token operator">=</span><span class="token punctuation">{</span>big<span class="token operator">|</span>little<span class="token punctuation">}</span>
|
||
</span><span class="code-line line-number" line="31"><span class="token comment"># 指定目标文件的小端。这个项将影响反汇编出来的指令。在反汇编的文件没描述小端信息的时候用。例如S-records. </span>
|
||
</span><span class="code-line line-number" line="32">
|
||
</span><span class="code-line line-number" line="33"><span class="token parameter variable">-f</span>
|
||
</span><span class="code-line line-number" line="34">--file-headers
|
||
</span><span class="code-line line-number" line="35">显示objfile中每个文件的整体头部摘要信息。
|
||
</span><span class="code-line line-number" line="36">
|
||
</span><span class="code-line line-number" line="37"><span class="token parameter variable">-h</span>
|
||
</span><span class="code-line line-number" line="38">--section-headers
|
||
</span><span class="code-line line-number" line="39"><span class="token parameter variable">--headers</span>
|
||
</span><span class="code-line line-number" line="40">显示目标文件各个section的头部摘要信息。
|
||
</span><span class="code-line line-number" line="41">
|
||
</span><span class="code-line line-number" line="42"><span class="token parameter variable">-H</span>
|
||
</span><span class="code-line line-number" line="43"><span class="token parameter variable">--help</span>
|
||
</span><span class="code-line line-number" line="44">简短的帮助信息。
|
||
</span><span class="code-line line-number" line="45">
|
||
</span><span class="code-line line-number" line="46"><span class="token parameter variable">-i</span>
|
||
</span><span class="code-line line-number" line="47"><span class="token parameter variable">--info</span>
|
||
</span><span class="code-line line-number" line="48">显示对于 <span class="token parameter variable">-b</span> 或者 <span class="token parameter variable">-m</span> 选项可用的架构和目标格式列表。
|
||
</span><span class="code-line line-number" line="49">
|
||
</span><span class="code-line line-number" line="50"><span class="token parameter variable">-j</span> name
|
||
</span><span class="code-line line-number" line="51"><span class="token parameter variable">--section</span><span class="token operator">=</span>name
|
||
</span><span class="code-line line-number" line="52">仅仅显示指定名称为name的section的信息
|
||
</span><span class="code-line line-number" line="53">
|
||
</span><span class="code-line line-number" line="54"><span class="token parameter variable">-l</span>
|
||
</span><span class="code-line line-number" line="55">--line-numbers
|
||
</span><span class="code-line line-number" line="56">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。
|
||
</span><span class="code-line line-number" line="57">
|
||
</span><span class="code-line line-number" line="58"><span class="token parameter variable">-m</span> machine
|
||
</span><span class="code-line line-number" line="59"><span class="token parameter variable">--architecture</span><span class="token operator">=</span>machine
|
||
</span><span class="code-line line-number" line="60">指定反汇编目标文件时使用的架构，当待反汇编文件本身没描述架构信息的时候<span class="token punctuation">(</span>比如S-records<span class="token punctuation">)</span>，这个选项很有用。可以用-i选项列出这里能够指定的架构.
|
||
</span><span class="code-line line-number" line="61">
|
||
</span><span class="code-line line-number" line="62"><span class="token parameter variable">--reloc</span>
|
||
</span><span class="code-line line-number" line="63"><span class="token parameter variable">-r</span>
|
||
</span><span class="code-line line-number" line="64">显示文件的重定位入口。如果和-d或者-D一起使用，重定位部分以反汇编后的格式显示出来。
|
||
</span><span class="code-line line-number" line="65">
|
||
</span><span class="code-line line-number" line="66">--dynamic-reloc
|
||
</span><span class="code-line line-number" line="67"><span class="token parameter variable">-R</span>
|
||
</span><span class="code-line line-number" line="68">显示文件的动态重定位入口，仅仅对于动态目标文件意义，比如某些共享库。
|
||
</span><span class="code-line line-number" line="69">
|
||
</span><span class="code-line line-number" line="70"><span class="token parameter variable">-s</span>
|
||
</span><span class="code-line line-number" line="71">--full-contents
|
||
</span><span class="code-line line-number" line="72">显示指定section的完整内容。默认所有的非空section都会被显示。
|
||
</span><span class="code-line line-number" line="73">
|
||
</span><span class="code-line line-number" line="74"><span class="token parameter variable">-S</span>
|
||
</span><span class="code-line line-number" line="75"><span class="token parameter variable">--source</span>
|
||
</span><span class="code-line line-number" line="76">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。
|
||
</span><span class="code-line line-number" line="77">
|
||
</span><span class="code-line line-number" line="78">--show-raw-insn
|
||
</span><span class="code-line line-number" line="79">反汇编的时候，显示每条汇编指令对应的机器码，如不指定--prefix-addresses，这将是缺省选项。
|
||
</span><span class="code-line line-number" line="80">
|
||
</span><span class="code-line line-number" line="81">--no-show-raw-insn
|
||
</span><span class="code-line line-number" line="82">反汇编时，不显示汇编指令的机器码，如不指定--prefix-addresses，这将是缺省选项。
|
||
</span><span class="code-line line-number" line="83">
|
||
</span><span class="code-line line-number" line="84">--start-address<span class="token operator">=</span>address
|
||
</span><span class="code-line line-number" line="85">从指定地址开始显示数据，该选项影响-d、-r和-s选项的输出。
|
||
</span><span class="code-line line-number" line="86">
|
||
</span><span class="code-line line-number" line="87">--stop-address<span class="token operator">=</span>address
|
||
</span><span class="code-line line-number" line="88">显示数据直到指定地址为止，该项影响-d、-r和-s选项的输出。
|
||
</span><span class="code-line line-number" line="89">
|
||
</span><span class="code-line line-number" line="90"><span class="token parameter variable">-t</span>
|
||
</span><span class="code-line line-number" line="91"><span class="token parameter variable">--syms</span>
|
||
</span><span class="code-line line-number" line="92">显示文件的符号表入口。类似于nm -s提供的信息
|
||
</span><span class="code-line line-number" line="93">
|
||
</span><span class="code-line line-number" line="94"><span class="token parameter variable">-T</span>
|
||
</span><span class="code-line line-number" line="95">--dynamic-syms
|
||
</span><span class="code-line line-number" line="96">显示文件的动态符号表入口，仅仅对动态目标文件意义，比如某些共享库。它显示的信息类似于 nm -D<span class="token operator">|</span>--dynamic 显示的信息。
|
||
</span><span class="code-line line-number" line="97">
|
||
</span><span class="code-line line-number" line="98"><span class="token parameter variable">-V</span>
|
||
</span><span class="code-line line-number" line="99"><span class="token parameter variable">--version</span>
|
||
</span><span class="code-line line-number" line="100">版本信息
|
||
</span><span class="code-line line-number" line="101">
|
||
</span><span class="code-line line-number" line="102">--all-headers
|
||
</span><span class="code-line line-number" line="103"><span class="token parameter variable">-x</span>
|
||
</span><span class="code-line line-number" line="104">显示所可用的头信息，包括符号表、重定位入口。-x 等价于-a <span class="token parameter variable">-f</span> <span class="token parameter variable">-h</span> <span class="token parameter variable">-r</span> <span class="token parameter variable">-t</span> 同时指定。
|
||
</span><span class="code-line line-number" line="105">
|
||
</span><span class="code-line line-number" line="106"><span class="token parameter variable">-z</span>
|
||
</span><span class="code-line line-number" line="107">--disassemble-zeroes
|
||
</span><span class="code-line line-number" line="108">一般反汇编输出将省略大块的零，该选项使得这些零块也被反汇编。
|
||
</span><span class="code-line line-number" line="109">
|
||
</span><span class="code-line line-number" line="110">@file 可以将选项集中到一个文件中，然后使用这个@file选项载入。
|
||
</span></code><div onclick="copied(this)" data-code="-a --archive-headers
|
||
# 显示档案库的成员信息,类似ls -l将lib*.a的信息列出。
|
||
|
||
-b bfdname --target=bfdname
|
||
# 指定目标码格式。这不是必须的，objdump能自动识别许多格式，比如：
|
||
|
||
objdump -b oasys -m vax -h fu.o
|
||
# 显示fu.o的头部摘要信息，明确指出该文件是Vax系统下用Oasys编译器生成的目标文件。objdump -i将给出这里可以指定的目标码格式列表。
|
||
|
||
-C --demangle
|
||
# 将底层的符号名解码成用户级名字，除了去掉所开头的下划线之外，还使得C++函数名以可理解的方式显示出来。
|
||
--debugging
|
||
-g
|
||
# 显示调试信息。企图解析保存在文件中的调试信息并以C语言的语法显示出来。仅仅支持某些类型的调试信息。有些其他的格式被readelf -w支持。
|
||
|
||
-e --debugging-tags
|
||
# 类似-g选项，但是生成的信息是和ctags工具相兼容的格式。
|
||
--disassemble
|
||
-d
|
||
# 从objfile中反汇编那些特定指令机器码的section。
|
||
|
||
-D --disassemble-all
|
||
# 与 -d 类似，但反汇编所有section.
|
||
|
||
--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。
|
||
|
||
-EB
|
||
-EL
|
||
--endian={big|little}
|
||
# 指定目标文件的小端。这个项将影响反汇编出来的指令。在反汇编的文件没描述小端信息的时候用。例如S-records.
|
||
|
||
-f
|
||
--file-headers
|
||
显示objfile中每个文件的整体头部摘要信息。
|
||
|
||
-h
|
||
--section-headers
|
||
--headers
|
||
显示目标文件各个section的头部摘要信息。
|
||
|
||
-H
|
||
--help
|
||
简短的帮助信息。
|
||
|
||
-i
|
||
--info
|
||
显示对于 -b 或者 -m 选项可用的架构和目标格式列表。
|
||
|
||
-j name
|
||
--section=name
|
||
仅仅显示指定名称为name的section的信息
|
||
|
||
-l
|
||
--line-numbers
|
||
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。
|
||
|
||
-m machine
|
||
--architecture=machine
|
||
指定反汇编目标文件时使用的架构，当待反汇编文件本身没描述架构信息的时候(比如S-records)，这个选项很有用。可以用-i选项列出这里能够指定的架构.
|
||
|
||
--reloc
|
||
-r
|
||
显示文件的重定位入口。如果和-d或者-D一起使用，重定位部分以反汇编后的格式显示出来。
|
||
|
||
--dynamic-reloc
|
||
-R
|
||
显示文件的动态重定位入口，仅仅对于动态目标文件意义，比如某些共享库。
|
||
|
||
-s
|
||
--full-contents
|
||
显示指定section的完整内容。默认所有的非空section都会被显示。
|
||
|
||
-S
|
||
--source
|
||
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。
|
||
|
||
--show-raw-insn
|
||
反汇编的时候，显示每条汇编指令对应的机器码，如不指定--prefix-addresses，这将是缺省选项。
|
||
|
||
--no-show-raw-insn
|
||
反汇编时，不显示汇编指令的机器码，如不指定--prefix-addresses，这将是缺省选项。
|
||
|
||
--start-address=address
|
||
从指定地址开始显示数据，该选项影响-d、-r和-s选项的输出。
|
||
|
||
--stop-address=address
|
||
显示数据直到指定地址为止，该项影响-d、-r和-s选项的输出。
|
||
|
||
-t
|
||
--syms
|
||
显示文件的符号表入口。类似于nm -s提供的信息
|
||
|
||
-T
|
||
--dynamic-syms
|
||
显示文件的动态符号表入口，仅仅对动态目标文件意义，比如某些共享库。它显示的信息类似于 nm -D|--dynamic 显示的信息。
|
||
|
||
-V
|
||
--version
|
||
版本信息
|
||
|
||
--all-headers
|
||
-x
|
||
显示所可用的头信息，包括符号表、重定位入口。-x 等价于-a -f -h -r -t 同时指定。
|
||
|
||
-z
|
||
--disassemble-zeroes
|
||
一般反汇编输出将省略大块的零，该选项使得这些零块也被反汇编。
|
||
|
||
@file 可以将选项集中到一个文件中，然后使用这个@file选项载入。
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<h3 id="实例"><a class="anchor" aria-hidden="true" tabindex="-1" href="#实例"><span class="octicon octicon-link"></span></a>实例</h3>
|
||
<p>首先，在给出后面大部分测试所基于的源代码以及编译指令。 源代码如下： </p>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1">root@localhost <span class="token punctuation">[</span>test<span class="token punctuation">]</span><span class="token comment"># nl mytest.cpp </span>
|
||
</span></code><div onclick="copied(this)" data-code="root@localhost [test]# nl mytest.cpp
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1">void <span class="token function-name function">printTest</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
||
</span><span class="code-line line-number" line="2"> char a<span class="token punctuation">;</span>
|
||
</span><span class="code-line line-number" line="3"> a <span class="token operator">=</span> <span class="token string">'a'</span><span class="token punctuation">;</span>
|
||
</span><span class="code-line line-number" line="4"><span class="token punctuation">}</span>
|
||
</span><span class="code-line line-number" line="5">
|
||
</span><span class="code-line line-number" line="6">void <span class="token function-name function">printTest2</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
||
</span><span class="code-line line-number" line="7">int a <span class="token operator">=</span> <span class="token number">2</span><span class="token punctuation">;</span>
|
||
</span><span class="code-line line-number" line="8"><span class="token assign-left variable">a</span><span class="token operator">+=</span><span class="token number">2</span><span class="token punctuation">;</span>
|
||
</span><span class="code-line line-number" line="9"><span class="token punctuation">}</span>
|
||
</span></code><div onclick="copied(this)" data-code="void printTest() {
|
||
char a;
|
||
a = 'a';
|
||
}
|
||
|
||
void printTest2() {
|
||
int a = 2;
|
||
a+=2;
|
||
}
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<p>对以上源代码进行编译，如下： </p>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1"><span class="token punctuation">[</span>root@localhost test<span class="token punctuation">]</span><span class="token comment"># g++ -c -g mytest.cpp </span>
|
||
</span></code><div onclick="copied(this)" data-code="[root@localhost test]# g++ -c -g mytest.cpp
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<p>这里，生成的文件是mytest.o，为了方便测试包含了调试的信息，对可执行文件的测试，显示的结果类似。 </p>
|
||
<p>**查看当前使用的objdump的版本号： **</p>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1"><span class="token punctuation">[</span>root@localhost test<span class="token punctuation">]</span><span class="token comment"># objdump -V </span>
|
||
</span><span class="code-line line-number" line="2">GNU objdump <span class="token number">2.17</span>.50.0.6-14.el5 <span class="token number">20061020</span>
|
||
</span><span class="code-line line-number" line="3">Copyright <span class="token number">2005</span> <span class="token function">free</span> Software Foundation, Inc.
|
||
</span><span class="code-line line-number" line="4">This program is <span class="token function">free</span> software<span class="token punctuation">;</span> you may redistribute it under the terms of
|
||
</span><span class="code-line line-number" line="5">the GNU General Public License. This program has absolutely no warranty.
|
||
</span></code><div onclick="copied(this)" data-code="[root@localhost test]# objdump -V
|
||
GNU objdump 2.17.50.0.6-14.el5 20061020
|
||
Copyright 2005 free Software Foundation, Inc.
|
||
This program is free software; you may redistribute it under the terms of
|
||
the GNU General Public License. This program has absolutely no warranty.
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<p>**查看档案库文件中的信息： **</p>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1"><span class="token punctuation">[</span>root@localhost test<span class="token punctuation">]</span><span class="token comment"># objdump -a libmy2.a </span>
|
||
</span><span class="code-line line-number" line="2">In archive libmy2.a:
|
||
</span><span class="code-line line-number" line="3">myfile.o: <span class="token function">file</span> <span class="token function">format</span> elf32-i386
|
||
</span><span class="code-line line-number" line="4">rwxrwxrwx <span class="token number">0</span>/0 <span class="token number">2724</span> Nov <span class="token number">16</span> <span class="token number">16</span>:06 <span class="token number">2009</span> myfile.o
|
||
</span><span class="code-line line-number" line="5">mytest.o: <span class="token function">file</span> <span class="token function">format</span> elf32-i386
|
||
</span><span class="code-line line-number" line="6">rw-r--r-- <span class="token number">0</span>/0 <span class="token number">727</span> Jul <span class="token number">13</span> <span class="token number">15</span>:32 <span class="token number">2011</span> mytest.o
|
||
</span></code><div onclick="copied(this)" data-code="[root@localhost test]# objdump -a libmy2.a
|
||
In archive libmy2.a:
|
||
myfile.o: file format elf32-i386
|
||
rwxrwxrwx 0/0 2724 Nov 16 16:06 2009 myfile.o
|
||
mytest.o: file format elf32-i386
|
||
rw-r--r-- 0/0 727 Jul 13 15:32 2011 mytest.o
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<p>*<em>这里，libmy2.a是一个使用ar命令将多个</em>.o目标文件打包而生成的静态库。命令的输出类似<code>ar -tv</code>，相比较<code>ar -tv</code>输出如下： **</p>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1"><span class="token punctuation">[</span>root@localhost test<span class="token punctuation">]</span><span class="token comment"># ar -tv libmy2.a </span>
|
||
</span><span class="code-line line-number" line="2">rwxrwxrwx <span class="token number">0</span>/0 <span class="token number">2724</span> Nov <span class="token number">16</span> <span class="token number">16</span>:06 <span class="token number">2009</span> myfile.o
|
||
</span><span class="code-line line-number" line="3">rw-r--r-- <span class="token number">0</span>/0 <span class="token number">727</span> Jul <span class="token number">13</span> <span class="token number">15</span>:32 <span class="token number">2011</span> mytest.o
|
||
</span></code><div onclick="copied(this)" data-code="[root@localhost test]# ar -tv libmy2.a
|
||
rwxrwxrwx 0/0 2724 Nov 16 16:06 2009 myfile.o
|
||
rw-r--r-- 0/0 727 Jul 13 15:32 2011 mytest.o
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<p>显示可用的架构和目标结构列表： </p>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1"><span class="token punctuation">[</span>root@localhost test<span class="token punctuation">]</span><span class="token comment"># objdump -i </span>
|
||
</span><span class="code-line line-number" line="2">BFD header <span class="token function">file</span> version <span class="token number">2.17</span>.50.0.6-14.el5 <span class="token number">20061020</span>
|
||
</span><span class="code-line line-number" line="3">elf32-i386
|
||
</span><span class="code-line line-number" line="4"><span class="token punctuation">(</span>header little endian, data little endian<span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="5"> i386
|
||
</span><span class="code-line line-number" line="6">a.out-i386-linux
|
||
</span><span class="code-line line-number" line="7"><span class="token punctuation">(</span>header little endian, data little endian<span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="8"> i386
|
||
</span><span class="code-line line-number" line="9">efi-app-ia32
|
||
</span><span class="code-line line-number" line="10"><span class="token punctuation">(</span>header little endian, data little endian<span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="11"> i386
|
||
</span><span class="code-line line-number" line="12">elf64-x86-64
|
||
</span><span class="code-line line-number" line="13"><span class="token punctuation">(</span>header little endian, data little endian<span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="14"> i386
|
||
</span><span class="code-line line-number" line="15">elf64-little
|
||
</span><span class="code-line line-number" line="16"><span class="token punctuation">(</span>header little endian, data little endian<span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="17"> i386
|
||
</span><span class="code-line line-number" line="18">elf64-big
|
||
</span><span class="code-line line-number" line="19"><span class="token punctuation">(</span>header big endian, data big endian<span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="20"> i386
|
||
</span><span class="code-line line-number" line="21">elf32-little
|
||
</span><span class="code-line line-number" line="22"><span class="token punctuation">(</span>header little endian, data little endian<span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="23"> i386
|
||
</span><span class="code-line line-number" line="24">elf32-big
|
||
</span><span class="code-line line-number" line="25"><span class="token punctuation">(</span>header big endian, data big endian<span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="26"> i386
|
||
</span><span class="code-line line-number" line="27">srec
|
||
</span><span class="code-line line-number" line="28"><span class="token punctuation">(</span>header endianness unknown, data endianness unknown<span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="29"> i386
|
||
</span><span class="code-line line-number" line="30">symbolsrec
|
||
</span><span class="code-line line-number" line="31"><span class="token punctuation">(</span>header endianness unknown, data endianness unknown<span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="32"> i386
|
||
</span><span class="code-line line-number" line="33">tekhex
|
||
</span><span class="code-line line-number" line="34"><span class="token punctuation">(</span>header endianness unknown, data endianness unknown<span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="35"> i386
|
||
</span><span class="code-line line-number" line="36">binary
|
||
</span><span class="code-line line-number" line="37"><span class="token punctuation">(</span>header endianness unknown, data endianness unknown<span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="38"> i386
|
||
</span><span class="code-line line-number" line="39">ihex
|
||
</span><span class="code-line line-number" line="40"><span class="token punctuation">(</span>header endianness unknown, data endianness unknown<span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="41"> i386
|
||
</span><span class="code-line line-number" line="42">trad-core
|
||
</span><span class="code-line line-number" line="43"><span class="token punctuation">(</span>header endianness unknown, data endianness unknown<span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="44">
|
||
</span><span class="code-line line-number" line="45"> elf32-i386 a.out-i386-linux efi-app-ia32 elf64-x86-64
|
||
</span><span class="code-line line-number" line="46"> i386 elf32-i386 a.out-i386-linux efi-app-ia32 elf64-x86-64
|
||
</span><span class="code-line line-number" line="47">
|
||
</span><span class="code-line line-number" line="48"> elf64-little elf64-big elf32-little elf32-big srec symbolsrec
|
||
</span><span class="code-line line-number" line="49"> i386 elf64-little elf64-big elf32-little elf32-big srec symbolsrec
|
||
</span><span class="code-line line-number" line="50">
|
||
</span><span class="code-line line-number" line="51"> tekhex binary ihex trad-core
|
||
</span><span class="code-line line-number" line="52"> i386 tekhex binary ihex ---------
|
||
</span></code><div onclick="copied(this)" data-code="[root@localhost test]# objdump -i
|
||
BFD header file version 2.17.50.0.6-14.el5 20061020
|
||
elf32-i386
|
||
(header little endian, data little endian)
|
||
i386
|
||
a.out-i386-linux
|
||
(header little endian, data little endian)
|
||
i386
|
||
efi-app-ia32
|
||
(header little endian, data little endian)
|
||
i386
|
||
elf64-x86-64
|
||
(header little endian, data little endian)
|
||
i386
|
||
elf64-little
|
||
(header little endian, data little endian)
|
||
i386
|
||
elf64-big
|
||
(header big endian, data big endian)
|
||
i386
|
||
elf32-little
|
||
(header little endian, data little endian)
|
||
i386
|
||
elf32-big
|
||
(header big endian, data big endian)
|
||
i386
|
||
srec
|
||
(header endianness unknown, data endianness unknown)
|
||
i386
|
||
symbolsrec
|
||
(header endianness unknown, data endianness unknown)
|
||
i386
|
||
tekhex
|
||
(header endianness unknown, data endianness unknown)
|
||
i386
|
||
binary
|
||
(header endianness unknown, data endianness unknown)
|
||
i386
|
||
ihex
|
||
(header endianness unknown, data endianness unknown)
|
||
i386
|
||
trad-core
|
||
(header endianness unknown, data endianness unknown)
|
||
|
||
elf32-i386 a.out-i386-linux efi-app-ia32 elf64-x86-64
|
||
i386 elf32-i386 a.out-i386-linux efi-app-ia32 elf64-x86-64
|
||
|
||
elf64-little elf64-big elf32-little elf32-big srec symbolsrec
|
||
i386 elf64-little elf64-big elf32-little elf32-big srec symbolsrec
|
||
|
||
tekhex binary ihex trad-core
|
||
i386 tekhex binary ihex ---------
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<p>这里，显示的信息是相对于 -b 或者 -m 选项可用的架构和目标格式列表。 </p>
|
||
<p>**显示mytest.o文件中的text段的内容： **</p>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1"><span class="token punctuation">[</span>root@localhost test<span class="token punctuation">]</span><span class="token comment"># objdump --section=.text -s mytest.o </span>
|
||
</span><span class="code-line line-number" line="2">mytest.o: <span class="token function">file</span> <span class="token function">format</span> elf32-i386
|
||
</span><span class="code-line line-number" line="3">Contents of section .text:
|
||
</span><span class="code-line line-number" line="4">0000 5589e583 ec10c645 ff61c9c3 5589e583 U<span class="token punctuation">..</span><span class="token punctuation">..</span><span class="token punctuation">..</span>E.a<span class="token punctuation">..</span>U<span class="token punctuation">..</span>.
|
||
</span><span class="code-line line-number" line="5">0010 ec10c745 fc020000 008345fc 02c9c3 <span class="token punctuation">..</span>.E<span class="token punctuation">..</span><span class="token punctuation">..</span><span class="token punctuation">..</span>E<span class="token punctuation">..</span><span class="token punctuation">..</span>
|
||
</span></code><div onclick="copied(this)" data-code="[root@localhost test]# objdump --section=.text -s mytest.o
|
||
mytest.o: file format elf32-i386
|
||
Contents of section .text:
|
||
0000 5589e583 ec10c645 ff61c9c3 5589e583 U......E.a..U...
|
||
0010 ec10c745 fc020000 008345fc 02c9c3 ...E......E....
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<p>这里注意，不能单独使用-j或者--section，例如<code>objdump --section=.text mytest.o</code>是不会运行成功的。 </p>
|
||
<p>**反汇编mytest.o中的text段内容，并尽可能用源代码形式表示： **</p>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1"><span class="token punctuation">[</span>root@localhost test<span class="token punctuation">]</span><span class="token comment"># objdump -j .text -S mytest.o </span>
|
||
</span><span class="code-line line-number" line="2">mytest.o: <span class="token function">file</span> <span class="token function">format</span> elf32-i386
|
||
</span><span class="code-line line-number" line="3">Disassembly of section .text:
|
||
</span><span class="code-line line-number" line="4">00000000 <span class="token operator"><</span>_Z9printTestv<span class="token operator">></span>:
|
||
</span><span class="code-line line-number" line="5">void printTest<span class="token punctuation">(</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="6"> <span class="token number">0</span>: <span class="token number">55</span> push %ebp
|
||
</span><span class="code-line line-number" line="7"> <span class="token number">1</span>: <span class="token number">89</span> e5 mov %esp,%ebp
|
||
</span><span class="code-line line-number" line="8"> <span class="token number">3</span>: <span class="token number">83</span> ec <span class="token number">10</span> sub <span class="token variable">$0x10</span>,%esp
|
||
</span><span class="code-line line-number" line="9"><span class="token punctuation">{</span>
|
||
</span><span class="code-line line-number" line="10"> char a<span class="token punctuation">;</span>
|
||
</span><span class="code-line line-number" line="11"> a <span class="token operator">=</span> <span class="token string">'a'</span><span class="token punctuation">;</span>
|
||
</span><span class="code-line line-number" line="12"> <span class="token number">6</span>: c6 <span class="token number">45</span> ff <span class="token number">61</span> movb <span class="token variable">$0x61</span>,0xffffffff<span class="token punctuation">(</span>%ebp<span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="13"><span class="token punctuation">}</span>
|
||
</span><span class="code-line line-number" line="14"> a: c9 leave
|
||
</span><span class="code-line line-number" line="15"> b: c3 ret
|
||
</span><span class="code-line line-number" line="16">
|
||
</span><span class="code-line line-number" line="17">000000c <span class="token operator"><</span>_Z10printTest2v<span class="token operator">></span>:
|
||
</span><span class="code-line line-number" line="18">void printTest2<span class="token punctuation">(</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="19"> c: <span class="token number">55</span> push %ebp
|
||
</span><span class="code-line line-number" line="20"> d: <span class="token number">89</span> e5 mov %esp,%ebp
|
||
</span><span class="code-line line-number" line="21"> f: <span class="token number">83</span> ec <span class="token number">10</span> sub <span class="token variable">$0x10</span>,%esp
|
||
</span><span class="code-line line-number" line="22"><span class="token punctuation">{</span>
|
||
</span><span class="code-line line-number" line="23"> int a <span class="token operator">=</span> <span class="token number">2</span><span class="token punctuation">;</span>
|
||
</span><span class="code-line line-number" line="24"> <span class="token number">12</span>: c7 <span class="token number">45</span> fc 02 00 00 00 movl <span class="token variable">$0x2</span>,0xfffffffc<span class="token punctuation">(</span>%ebp<span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="25"> <span class="token assign-left variable">a</span><span class="token operator">+=</span><span class="token number">2</span><span class="token punctuation">;</span>
|
||
</span><span class="code-line line-number" line="26"> <span class="token number">19</span>: <span class="token number">83</span> <span class="token number">45</span> fc 02 addl <span class="token variable">$0x2</span>,0xfffffffc<span class="token punctuation">(</span>%ebp<span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="27"><span class="token punctuation">}</span>
|
||
</span><span class="code-line line-number" line="28"> 1d: c9 leave
|
||
</span><span class="code-line line-number" line="29"> 1e: c3 ret
|
||
</span></code><div onclick="copied(this)" data-code="[root@localhost test]# objdump -j .text -S mytest.o
|
||
mytest.o: file format elf32-i386
|
||
Disassembly of section .text:
|
||
00000000 <_Z9printTestv>:
|
||
void printTest()
|
||
0: 55 push %ebp
|
||
1: 89 e5 mov %esp,%ebp
|
||
3: 83 ec 10 sub $0x10,%esp
|
||
{
|
||
char a;
|
||
a = 'a';
|
||
6: c6 45 ff 61 movb $0x61,0xffffffff(%ebp)
|
||
}
|
||
a: c9 leave
|
||
b: c3 ret
|
||
|
||
000000c <_Z10printTest2v>:
|
||
void printTest2()
|
||
c: 55 push %ebp
|
||
d: 89 e5 mov %esp,%ebp
|
||
f: 83 ec 10 sub $0x10,%esp
|
||
{
|
||
int a = 2;
|
||
12: c7 45 fc 02 00 00 00 movl $0x2,0xfffffffc(%ebp)
|
||
a+=2;
|
||
19: 83 45 fc 02 addl $0x2,0xfffffffc(%ebp)
|
||
}
|
||
1d: c9 leave
|
||
1e: c3 ret
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<p>这里注意，不能单独使用-j或者--section，例如<code>objdump -j .text mytest.o是不会运行成功的</code>。另外-S命令对于包含调试信息的目标文件，显示的效果比较好，如果编译时没有指定g++的-g选项，那么目标文件就不包含调试信息，那么显示效果就差多了。 </p>
|
||
<p>**反汇编出mytest.o的源代码: **</p>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1"><span class="token punctuation">[</span>root@localhost test<span class="token punctuation">]</span><span class="token comment"># objdump -S mytest.o </span>
|
||
</span><span class="code-line line-number" line="2">mytest.o: <span class="token function">file</span> <span class="token function">format</span> elf32-i386
|
||
</span><span class="code-line line-number" line="3">
|
||
</span><span class="code-line line-number" line="4">Disassembly of section .text:
|
||
</span><span class="code-line line-number" line="5">
|
||
</span><span class="code-line line-number" line="6">00000000 <span class="token operator"><</span>_Z9printTestv<span class="token operator">></span>:
|
||
</span><span class="code-line line-number" line="7">void printTest<span class="token punctuation">(</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="8"> <span class="token number">0</span>: <span class="token number">55</span> push %ebp
|
||
</span><span class="code-line line-number" line="9"> <span class="token number">1</span>: <span class="token number">89</span> e5 mov %esp,%ebp
|
||
</span><span class="code-line line-number" line="10"> <span class="token number">3</span>: <span class="token number">83</span> ec <span class="token number">10</span> sub <span class="token variable">$0x10</span>,%esp
|
||
</span><span class="code-line line-number" line="11"><span class="token punctuation">{</span>
|
||
</span><span class="code-line line-number" line="12"> char a<span class="token punctuation">;</span>
|
||
</span><span class="code-line line-number" line="13"> a <span class="token operator">=</span> <span class="token string">'a'</span><span class="token punctuation">;</span>
|
||
</span><span class="code-line line-number" line="14"> <span class="token number">6</span>: c6 <span class="token number">45</span> ff <span class="token number">61</span> movb <span class="token variable">$0x61</span>,0xffffffff<span class="token punctuation">(</span>%ebp<span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="15"><span class="token punctuation">}</span>
|
||
</span><span class="code-line line-number" line="16"> a: c9 leave
|
||
</span><span class="code-line line-number" line="17"> b: c3 ret
|
||
</span><span class="code-line line-number" line="18">
|
||
</span><span class="code-line line-number" line="19">0000000c <span class="token operator"><</span>_Z10printTest2v<span class="token operator">></span>:
|
||
</span><span class="code-line line-number" line="20">void printTest2<span class="token punctuation">(</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="21"> c: <span class="token number">55</span> push %ebp
|
||
</span><span class="code-line line-number" line="22"> d: <span class="token number">89</span> e5 mov %esp,%ebp
|
||
</span><span class="code-line line-number" line="23"> f: <span class="token number">83</span> ec <span class="token number">10</span> sub <span class="token variable">$0x10</span>,%esp
|
||
</span><span class="code-line line-number" line="24"><span class="token punctuation">{</span>
|
||
</span><span class="code-line line-number" line="25"> int a <span class="token operator">=</span> <span class="token number">2</span><span class="token punctuation">;</span>
|
||
</span><span class="code-line line-number" line="26"> <span class="token number">12</span>: c7 <span class="token number">45</span> fc 02 00 00 00 movl <span class="token variable">$0x2</span>,0xfffffffc<span class="token punctuation">(</span>%ebp<span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="27"> <span class="token assign-left variable">a</span><span class="token operator">+=</span><span class="token number">2</span><span class="token punctuation">;</span>
|
||
</span><span class="code-line line-number" line="28"> <span class="token number">19</span>: <span class="token number">83</span> <span class="token number">45</span> fc 02 addl <span class="token variable">$0x2</span>,0xfffffffc<span class="token punctuation">(</span>%ebp<span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="29"><span class="token punctuation">}</span>
|
||
</span><span class="code-line line-number" line="30"> 1d: c9 leave
|
||
</span><span class="code-line line-number" line="31"> 1e: c3 ret
|
||
</span></code><div onclick="copied(this)" data-code="[root@localhost test]# objdump -S mytest.o
|
||
mytest.o: file format elf32-i386
|
||
|
||
Disassembly of section .text:
|
||
|
||
00000000 <_Z9printTestv>:
|
||
void printTest()
|
||
0: 55 push %ebp
|
||
1: 89 e5 mov %esp,%ebp
|
||
3: 83 ec 10 sub $0x10,%esp
|
||
{
|
||
char a;
|
||
a = 'a';
|
||
6: c6 45 ff 61 movb $0x61,0xffffffff(%ebp)
|
||
}
|
||
a: c9 leave
|
||
b: c3 ret
|
||
|
||
0000000c <_Z10printTest2v>:
|
||
void printTest2()
|
||
c: 55 push %ebp
|
||
d: 89 e5 mov %esp,%ebp
|
||
f: 83 ec 10 sub $0x10,%esp
|
||
{
|
||
int a = 2;
|
||
12: c7 45 fc 02 00 00 00 movl $0x2,0xfffffffc(%ebp)
|
||
a+=2;
|
||
19: 83 45 fc 02 addl $0x2,0xfffffffc(%ebp)
|
||
}
|
||
1d: c9 leave
|
||
1e: c3 ret
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<p>这里，尤其当编译的时候指定了-g这种调试参数时，反汇编的效果比较明显。隐含了-d参数。 </p>
|
||
<p>**显示文件的符号表入口: **</p>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1"><span class="token punctuation">[</span>root@localhost test<span class="token punctuation">]</span><span class="token comment"># objdump -t mytest.o </span>
|
||
</span><span class="code-line line-number" line="2">mytest.o: <span class="token function">file</span> <span class="token function">format</span> elf32-i386
|
||
</span><span class="code-line line-number" line="3">
|
||
</span><span class="code-line line-number" line="4">SYMBOL TABLE:
|
||
</span><span class="code-line line-number" line="5">00000000 l <span class="token function">df</span> *ABS* 00000000 mytest.cpp
|
||
</span><span class="code-line line-number" line="6">00000000 l d .text 00000000 .text
|
||
</span><span class="code-line line-number" line="7">00000000 l d .data 00000000 .data
|
||
</span><span class="code-line line-number" line="8">00000000 l d .bss 00000000 .bss
|
||
</span><span class="code-line line-number" line="9">00000000 l d .debug_abbrev 00000000 .debug_abbrev
|
||
</span><span class="code-line line-number" line="10">00000000 l d .debug_info 00000000 .debug_info
|
||
</span><span class="code-line line-number" line="11">00000000 l d .debug_line 00000000 .debug_line
|
||
</span><span class="code-line line-number" line="12">00000000 l d .debug_frame 00000000 .debug_frame
|
||
</span><span class="code-line line-number" line="13">00000000 l d .debug_loc 00000000 .debug_loc
|
||
</span><span class="code-line line-number" line="14">00000000 l d .debug_pubnames 00000000 .debug_pubnames
|
||
</span><span class="code-line line-number" line="15">00000000 l d .debug_aranges 00000000 .debug_aranges
|
||
</span><span class="code-line line-number" line="16">00000000 l d .note.GNU-stack 00000000 .note.GNU-stack
|
||
</span><span class="code-line line-number" line="17">00000000 l d .comment 00000000 .comment
|
||
</span><span class="code-line line-number" line="18">00000000 g F .text 0000000c _Z9printTestv
|
||
</span><span class="code-line line-number" line="19">00000000 *UND* 00000000 __gxx_personality_v0
|
||
</span><span class="code-line line-number" line="20">0000000c g F .text 00000013 _Z10printTest2v
|
||
</span></code><div onclick="copied(this)" data-code="[root@localhost test]# objdump -t mytest.o
|
||
mytest.o: file format elf32-i386
|
||
|
||
SYMBOL TABLE:
|
||
00000000 l df *ABS* 00000000 mytest.cpp
|
||
00000000 l d .text 00000000 .text
|
||
00000000 l d .data 00000000 .data
|
||
00000000 l d .bss 00000000 .bss
|
||
00000000 l d .debug_abbrev 00000000 .debug_abbrev
|
||
00000000 l d .debug_info 00000000 .debug_info
|
||
00000000 l d .debug_line 00000000 .debug_line
|
||
00000000 l d .debug_frame 00000000 .debug_frame
|
||
00000000 l d .debug_loc 00000000 .debug_loc
|
||
00000000 l d .debug_pubnames 00000000 .debug_pubnames
|
||
00000000 l d .debug_aranges 00000000 .debug_aranges
|
||
00000000 l d .note.GNU-stack 00000000 .note.GNU-stack
|
||
00000000 l d .comment 00000000 .comment
|
||
00000000 g F .text 0000000c _Z9printTestv
|
||
00000000 *UND* 00000000 __gxx_personality_v0
|
||
0000000c g F .text 00000013 _Z10printTest2v
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<p>这里，输出的信息类似<code>nm -s</code>命令的输出，相比较之下，nm命令的输出如下： </p>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1"><span class="token punctuation">[</span>root@localhost test<span class="token punctuation">]</span><span class="token comment"># nm -s mytest.o </span>
|
||
</span><span class="code-line line-number" line="2">0000000c T _Z10printTest2v
|
||
</span><span class="code-line line-number" line="3">00000000 T _Z9printTestv
|
||
</span><span class="code-line line-number" line="4"> U __gxx_personality_v0
|
||
</span></code><div onclick="copied(this)" data-code="[root@localhost test]# nm -s mytest.o
|
||
0000000c T _Z10printTest2v
|
||
00000000 T _Z9printTestv
|
||
U __gxx_personality_v0
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<p>**显示文件的符号表入口，将底层符号解码并表示成用户级别: **</p>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1"><span class="token punctuation">[</span>root@localhost test<span class="token punctuation">]</span><span class="token comment"># objdump -t -C mytest.o </span>
|
||
</span><span class="code-line line-number" line="2">mytest.o: <span class="token function">file</span> <span class="token function">format</span> elf32-i386
|
||
</span><span class="code-line line-number" line="3">SYMBOL TABLE:
|
||
</span><span class="code-line line-number" line="4">00000000 l <span class="token function">df</span> *ABS* 00000000 mytest.cpp
|
||
</span><span class="code-line line-number" line="5">00000000 l d .text 00000000 .text
|
||
</span><span class="code-line line-number" line="6">00000000 l d .data 00000000 .data
|
||
</span><span class="code-line line-number" line="7">00000000 l d .bss 00000000 .bss
|
||
</span><span class="code-line line-number" line="8">00000000 l d .debug_abbrev 00000000 .debug_abbrev
|
||
</span><span class="code-line line-number" line="9">00000000 l d .debug_info 00000000 .debug_info
|
||
</span><span class="code-line line-number" line="10">00000000 l d .debug_line 00000000 .debug_line
|
||
</span><span class="code-line line-number" line="11">00000000 l d .debug_frame 00000000 .debug_frame
|
||
</span><span class="code-line line-number" line="12">00000000 l d .debug_loc 00000000 .debug_loc
|
||
</span><span class="code-line line-number" line="13">00000000 l d .debug_pubnames 00000000 .debug_pubnames
|
||
</span><span class="code-line line-number" line="14">00000000 l d .debug_aranges 00000000 .debug_aranges
|
||
</span><span class="code-line line-number" line="15">00000000 l d .note.GNU-stack 00000000 .note.GNU-stack
|
||
</span><span class="code-line line-number" line="16">00000000 l d .comment 00000000 .comment
|
||
</span><span class="code-line line-number" line="17">00000000 g F .text 0000000c printTest<span class="token punctuation">(</span><span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="18">00000000 *UND* 00000000 __gxx_personality_v0
|
||
</span><span class="code-line line-number" line="19">0000000c g F .text 00000013 printTest2<span class="token punctuation">(</span><span class="token punctuation">)</span>
|
||
</span></code><div onclick="copied(this)" data-code="[root@localhost test]# objdump -t -C mytest.o
|
||
mytest.o: file format elf32-i386
|
||
SYMBOL TABLE:
|
||
00000000 l df *ABS* 00000000 mytest.cpp
|
||
00000000 l d .text 00000000 .text
|
||
00000000 l d .data 00000000 .data
|
||
00000000 l d .bss 00000000 .bss
|
||
00000000 l d .debug_abbrev 00000000 .debug_abbrev
|
||
00000000 l d .debug_info 00000000 .debug_info
|
||
00000000 l d .debug_line 00000000 .debug_line
|
||
00000000 l d .debug_frame 00000000 .debug_frame
|
||
00000000 l d .debug_loc 00000000 .debug_loc
|
||
00000000 l d .debug_pubnames 00000000 .debug_pubnames
|
||
00000000 l d .debug_aranges 00000000 .debug_aranges
|
||
00000000 l d .note.GNU-stack 00000000 .note.GNU-stack
|
||
00000000 l d .comment 00000000 .comment
|
||
00000000 g F .text 0000000c printTest()
|
||
00000000 *UND* 00000000 __gxx_personality_v0
|
||
0000000c g F .text 00000013 printTest2()
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<p>这里，和没-C相比，printTest2函数可读性增加了。 </p>
|
||
<p>**反汇编目标文件的特定机器码段： **</p>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1"><span class="token punctuation">[</span>root@localhost test<span class="token punctuation">]</span><span class="token comment"># objdump -d mytest.o </span>
|
||
</span><span class="code-line line-number" line="2">mytest.o: <span class="token function">file</span> <span class="token function">format</span> elf32-i386
|
||
</span><span class="code-line line-number" line="3">Disassembly of section .text:
|
||
</span><span class="code-line line-number" line="4">
|
||
</span><span class="code-line line-number" line="5">00000000 <span class="token operator"><</span>_Z9printTestv<span class="token operator">></span>:
|
||
</span><span class="code-line line-number" line="6"> <span class="token number">0</span>: <span class="token number">55</span> push %ebp
|
||
</span><span class="code-line line-number" line="7"> <span class="token number">1</span>: <span class="token number">89</span> e5 mov %esp,%ebp
|
||
</span><span class="code-line line-number" line="8"> <span class="token number">3</span>: <span class="token number">83</span> ec <span class="token number">10</span> sub <span class="token variable">$0x10</span>,%esp
|
||
</span><span class="code-line line-number" line="9"> <span class="token number">6</span>: c6 <span class="token number">45</span> ff <span class="token number">61</span> movb <span class="token variable">$0x61</span>,0xffffffff<span class="token punctuation">(</span>%ebp<span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="10"> a: c9 leave
|
||
</span><span class="code-line line-number" line="11"> b: c3 ret
|
||
</span><span class="code-line line-number" line="12">
|
||
</span><span class="code-line line-number" line="13">0000000c <span class="token operator"><</span>_Z10printTest2v<span class="token operator">></span>:
|
||
</span><span class="code-line line-number" line="14"> c: <span class="token number">55</span> push %ebp
|
||
</span><span class="code-line line-number" line="15"> d: <span class="token number">89</span> e5 mov %esp,%ebp
|
||
</span><span class="code-line line-number" line="16"> f: <span class="token number">83</span> ec <span class="token number">10</span> sub <span class="token variable">$0x10</span>,%esp
|
||
</span><span class="code-line line-number" line="17"> <span class="token number">12</span>: c7 <span class="token number">45</span> fc 02 00 00 00 movl <span class="token variable">$0x2</span>,0xfffffffc<span class="token punctuation">(</span>%ebp<span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="18"> <span class="token number">19</span>: <span class="token number">83</span> <span class="token number">45</span> fc 02 addl <span class="token variable">$0x2</span>,0xfffffffc<span class="token punctuation">(</span>%ebp<span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="19"> 1d: c9 leave
|
||
</span><span class="code-line line-number" line="20"> 1e: c3 ret
|
||
</span></code><div onclick="copied(this)" data-code="[root@localhost test]# objdump -d mytest.o
|
||
mytest.o: file format elf32-i386
|
||
Disassembly of section .text:
|
||
|
||
00000000 <_Z9printTestv>:
|
||
0: 55 push %ebp
|
||
1: 89 e5 mov %esp,%ebp
|
||
3: 83 ec 10 sub $0x10,%esp
|
||
6: c6 45 ff 61 movb $0x61,0xffffffff(%ebp)
|
||
a: c9 leave
|
||
b: c3 ret
|
||
|
||
0000000c <_Z10printTest2v>:
|
||
c: 55 push %ebp
|
||
d: 89 e5 mov %esp,%ebp
|
||
f: 83 ec 10 sub $0x10,%esp
|
||
12: c7 45 fc 02 00 00 00 movl $0x2,0xfffffffc(%ebp)
|
||
19: 83 45 fc 02 addl $0x2,0xfffffffc(%ebp)
|
||
1d: c9 leave
|
||
1e: c3 ret
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<p>这里，对text段的内容进行了反汇编。 </p>
|
||
<p>**反汇编特定段，并将汇编代码对应的文件名称和行号对应上： **</p>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1"><span class="token punctuation">[</span>root@localhost test<span class="token punctuation">]</span><span class="token comment"># objdump -d -l mytest.o</span>
|
||
</span><span class="code-line line-number" line="2">mytest.o: <span class="token function">file</span> <span class="token function">format</span> elf32-i386
|
||
</span><span class="code-line line-number" line="3">Disassembly of section .text:
|
||
</span><span class="code-line line-number" line="4">
|
||
</span><span class="code-line line-number" line="5">00000000 <span class="token operator"><</span>_Z9printTestv<span class="token operator">></span>:
|
||
</span><span class="code-line line-number" line="6">_Z9printTestv<span class="token punctuation">(</span><span class="token punctuation">)</span>:
|
||
</span><span class="code-line line-number" line="7">/root/test/04_libraryTest/mytest.cpp:1
|
||
</span><span class="code-line line-number" line="8"> <span class="token number">0</span>: <span class="token number">55</span> push %ebp
|
||
</span><span class="code-line line-number" line="9"> <span class="token number">1</span>: <span class="token number">89</span> e5 mov %esp,%ebp
|
||
</span><span class="code-line line-number" line="10"> <span class="token number">3</span>: <span class="token number">83</span> ec <span class="token number">10</span> sub <span class="token variable">$0x10</span>,%esp
|
||
</span><span class="code-line line-number" line="11">/root/test/04_libraryTest/mytest.cpp:4
|
||
</span><span class="code-line line-number" line="12"> <span class="token number">6</span>: c6 <span class="token number">45</span> ff <span class="token number">61</span> movb <span class="token variable">$0x61</span>,0xffffffff<span class="token punctuation">(</span>%ebp<span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="13">/root/test/04_libraryTest/mytest.cpp:5
|
||
</span><span class="code-line line-number" line="14"> a: c9 leave
|
||
</span><span class="code-line line-number" line="15"> b: c3 ret
|
||
</span><span class="code-line line-number" line="16">
|
||
</span><span class="code-line line-number" line="17">0000000c <span class="token operator"><</span>_Z10printTest2v<span class="token operator">></span>:
|
||
</span><span class="code-line line-number" line="18">_Z10printTest2v<span class="token punctuation">(</span><span class="token punctuation">)</span>:
|
||
</span><span class="code-line line-number" line="19">/root/test/04_libraryTest/mytest.cpp:6
|
||
</span><span class="code-line line-number" line="20"> c: <span class="token number">55</span> push %ebp
|
||
</span><span class="code-line line-number" line="21"> d: <span class="token number">89</span> e5 mov %esp,%ebp
|
||
</span><span class="code-line line-number" line="22"> f: <span class="token number">83</span> ec <span class="token number">10</span> sub <span class="token variable">$0x10</span>,%esp
|
||
</span><span class="code-line line-number" line="23">/root/test/04_libraryTest/mytest.cpp:8
|
||
</span><span class="code-line line-number" line="24"> <span class="token number">12</span>: c7 <span class="token number">45</span> fc 02 00 00 00 movl <span class="token variable">$0x2</span>,0xfffffffc<span class="token punctuation">(</span>%ebp<span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="25">/root/test/04_libraryTest/mytest.cpp:9
|
||
</span><span class="code-line line-number" line="26"> <span class="token number">19</span>: <span class="token number">83</span> <span class="token number">45</span> fc 02 addl <span class="token variable">$0x2</span>,0xfffffffc<span class="token punctuation">(</span>%ebp<span class="token punctuation">)</span>
|
||
</span><span class="code-line line-number" line="27">/root/test/04_libraryTest/mytest.cpp:10
|
||
</span><span class="code-line line-number" line="28"> 1d: c9 leave
|
||
</span><span class="code-line line-number" line="29"> 1e: c3 ret
|
||
</span></code><div onclick="copied(this)" data-code="[root@localhost test]# objdump -d -l mytest.o
|
||
mytest.o: file format elf32-i386
|
||
Disassembly of section .text:
|
||
|
||
00000000 <_Z9printTestv>:
|
||
_Z9printTestv():
|
||
/root/test/04_libraryTest/mytest.cpp:1
|
||
0: 55 push %ebp
|
||
1: 89 e5 mov %esp,%ebp
|
||
3: 83 ec 10 sub $0x10,%esp
|
||
/root/test/04_libraryTest/mytest.cpp:4
|
||
6: c6 45 ff 61 movb $0x61,0xffffffff(%ebp)
|
||
/root/test/04_libraryTest/mytest.cpp:5
|
||
a: c9 leave
|
||
b: c3 ret
|
||
|
||
0000000c <_Z10printTest2v>:
|
||
_Z10printTest2v():
|
||
/root/test/04_libraryTest/mytest.cpp:6
|
||
c: 55 push %ebp
|
||
d: 89 e5 mov %esp,%ebp
|
||
f: 83 ec 10 sub $0x10,%esp
|
||
/root/test/04_libraryTest/mytest.cpp:8
|
||
12: c7 45 fc 02 00 00 00 movl $0x2,0xfffffffc(%ebp)
|
||
/root/test/04_libraryTest/mytest.cpp:9
|
||
19: 83 45 fc 02 addl $0x2,0xfffffffc(%ebp)
|
||
/root/test/04_libraryTest/mytest.cpp:10
|
||
1d: c9 leave
|
||
1e: c3 ret
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<p>这里，项"-d"从objfile中反汇编那些特定指令机器码的section，而使用"-l"指定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。 </p>
|
||
<p>**显示目标文件各个段的头部摘要信息： **</p>
|
||
<pre class="language-shell"><code class="language-shell code-highlight"><span class="code-line line-number" line="1"><span class="token punctuation">[</span>root@localhost test<span class="token punctuation">]</span><span class="token comment"># objdump -h mytest.o </span>
|
||
</span><span class="code-line line-number" line="2">mytest.o: <span class="token function">file</span> <span class="token function">format</span> elf32-i386
|
||
</span><span class="code-line line-number" line="3">
|
||
</span><span class="code-line line-number" line="4">Sections:
|
||
</span><span class="code-line line-number" line="5">Idx Name Size VMA LMA File off Algn
|
||
</span><span class="code-line line-number" line="6"> <span class="token number">0</span> .text 0000001f 00000000 00000000 00000034 <span class="token number">2</span>**2
|
||
</span><span class="code-line line-number" line="7"> CONTENTS, ALLOC, LOAD, readonly, CODE
|
||
</span><span class="code-line line-number" line="8"> <span class="token number">1</span> .data 00000000 00000000 00000000 00000054 <span class="token number">2</span>**2
|
||
</span><span class="code-line line-number" line="9"> CONTENTS, ALLOC, LOAD, DATA
|
||
</span><span class="code-line line-number" line="10"> <span class="token number">2</span> .bss 00000000 00000000 00000000 00000054 <span class="token number">2</span>**2
|
||
</span><span class="code-line line-number" line="11"> ALLOC
|
||
</span><span class="code-line line-number" line="12"> <span class="token number">3</span> .debug_abbrev 00000046 00000000 00000000 00000054 <span class="token number">2</span>**0
|
||
</span><span class="code-line line-number" line="13"> CONTENTS, READONLY, DEBUGGING
|
||
</span><span class="code-line line-number" line="14"> <span class="token number">4</span> .debug_info 000000ed 00000000 00000000 0000009a <span class="token number">2</span>**0
|
||
</span><span class="code-line line-number" line="15"> CONTENTS, RELOC, READONLY, DEBUGGING
|
||
</span><span class="code-line line-number" line="16"> <span class="token number">5</span> .debug_line 0000003e 00000000 00000000 00000187 <span class="token number">2</span>**0
|
||
</span><span class="code-line line-number" line="17"> CONTENTS, RELOC, READONLY, DEBUGGING
|
||
</span><span class="code-line line-number" line="18"> <span class="token number">6</span> .debug_frame 00000044 00000000 00000000 000001c8 <span class="token number">2</span>**2
|
||
</span><span class="code-line line-number" line="19"> CONTENTS, RELOC, READONLY, DEBUGGING
|
||
</span><span class="code-line line-number" line="20"> <span class="token number">7</span> .debug_loc 00000058 00000000 00000000 0000020c <span class="token number">2</span>**0
|
||
</span><span class="code-line line-number" line="21"> CONTENTS, READONLY, DEBUGGING
|
||
</span><span class="code-line line-number" line="22"> <span class="token number">8</span> .debug_pubnames 0000002f 00000000 00000000 00000264 <span class="token number">2</span>**0
|
||
</span><span class="code-line line-number" line="23"> CONTENTS, RELOC, READONLY, DEBUGGING
|
||
</span><span class="code-line line-number" line="24"> <span class="token number">9</span> .debug_aranges 00000020 00000000 00000000 00000293 <span class="token number">2</span>**0
|
||
</span><span class="code-line line-number" line="25"> CONTENTS, RELOC, READONLY, DEBUGGING
|
||
</span><span class="code-line line-number" line="26"><span class="token number">10</span> .comment 0000002e 00000000 00000000 000002b3 <span class="token number">2</span>**0
|
||
</span><span class="code-line line-number" line="27"> CONTENTS, READONLY
|
||
</span><span class="code-line line-number" line="28"><span class="token number">11</span> .note.GNU-stack 00000000 00000000 00000000 000002e1 <span class="token number">2</span>**0
|
||
</span><span class="code-line line-number" line="29"> CONTENTS, READONLY
|
||
</span></code><div onclick="copied(this)" data-code="[root@localhost test]# objdump -h mytest.o
|
||
mytest.o: file format elf32-i386
|
||
|
||
Sections:
|
||
Idx Name Size VMA LMA File off Algn
|
||
0 .text 0000001f 00000000 00000000 00000034 2**2
|
||
CONTENTS, ALLOC, LOAD, readonly, CODE
|
||
1 .data 00000000 00000000 00000000 00000054 2**2
|
||
CONTENTS, ALLOC, LOAD, DATA
|
||
2 .bss 00000000 00000000 00000000 00000054 2**2
|
||
ALLOC
|
||
3 .debug_abbrev 00000046 00000000 00000000 00000054 2**0
|
||
CONTENTS, READONLY, DEBUGGING
|
||
4 .debug_info 000000ed 00000000 00000000 0000009a 2**0
|
||
CONTENTS, RELOC, READONLY, DEBUGGING
|
||
5 .debug_line 0000003e 00000000 00000000 00000187 2**0
|
||
CONTENTS, RELOC, READONLY, DEBUGGING
|
||
6 .debug_frame 00000044 00000000 00000000 000001c8 2**2
|
||
CONTENTS, RELOC, READONLY, DEBUGGING
|
||
7 .debug_loc 00000058 00000000 00000000 0000020c 2**0
|
||
CONTENTS, READONLY, DEBUGGING
|
||
8 .debug_pubnames 0000002f 00000000 00000000 00000264 2**0
|
||
CONTENTS, RELOC, READONLY, DEBUGGING
|
||
9 .debug_aranges 00000020 00000000 00000000 00000293 2**0
|
||
CONTENTS, RELOC, READONLY, DEBUGGING
|
||
10 .comment 0000002e 00000000 00000000 000002b3 2**0
|
||
CONTENTS, READONLY
|
||
11 .note.GNU-stack 00000000 00000000 00000000 000002e1 2**0
|
||
CONTENTS, READONLY
|
||
" class="copied"><svg class="octicon-copy" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg><svg class="octicon-check" aria-hidden="true" viewBox="0 0 16 16" fill="currentColor" height="12" width="12"><path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg></div></pre>
|
||
<p>这里，更多的内容参见<code>man objdump</code>中的这个选项。</p>
|
||
<style>markdown-style pre .copied {
|
||
display: flex;
|
||
position: absolute;
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||
cursor: pointer;
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color: #a5afbb;
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|
||
right: 6px;
|
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border-radius: 5px;
|
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background: #82828226;
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padding: 6px;
|
||
font-size: 12px;
|
||
transition: all .3s;
|
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|
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markdown-style pre .copied:not(.active) {
|
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visibility: hidden;
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|
||
markdown-style pre:hover .copied {
|
||
visibility: visible;
|
||
}
|
||
markdown-style pre:hover .copied:hover {
|
||
background: #4caf50;
|
||
color: #fff;
|
||
}
|
||
markdown-style pre:hover .copied:active,
|
||
markdown-style pre .copied.active {
|
||
background: #2e9b33;
|
||
color: #fff;
|
||
}
|
||
markdown-style pre .copied .octicon-copy {
|
||
display: block;
|
||
}
|
||
markdown-style pre .copied .octicon-check {
|
||
display: none;
|
||
}
|
||
markdown-style pre .active .octicon-copy {
|
||
display: none;
|
||
}
|
||
markdown-style pre .active .octicon-check {
|
||
display: block;
|
||
}</style><script>/*! @uiw/copy-to-clipboard v1.0.12 | MIT (c) 2021 Kenny Wang | https://github.com/uiwjs/copy-to-clipboard.git */
|
||
!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):(e="undefined"!=typeof globalThis?globalThis:e||self).copyTextToClipboard=t()}(this,(function(){"use strict";return function(e,t){const o=document.createElement("textarea");o.value=e,o.setAttribute("readonly",""),o.style={position:"absolute",left:"-9999px"},document.body.appendChild(o);const n=document.getSelection().rangeCount>0&&document.getSelection().getRangeAt(0);o.select();let c=!1;try{c=!!document.execCommand("copy")}catch(e){c=!1}document.body.removeChild(o),n&&document.getSelection&&(document.getSelection().removeAllRanges(),document.getSelection().addRange(n)),t&&t(c)}}));
|
||
|
||
function copied(target, str) {
|
||
target.classList.add('active');
|
||
copyTextToClipboard(target.dataset.code, function() {
|
||
setTimeout(() => {
|
||
target.classList.remove('active');
|
||
}, 2000);
|
||
});
|
||
}</script></markdown-style>
|
||
|
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