{"id":1035,"date":"2022-03-01T17:40:47","date_gmt":"2022-03-01T09:40:47","guid":{"rendered":"https:\/\/www.xianwaizhiyin.net\/?p=1035"},"modified":"2022-07-28T08:41:40","modified_gmt":"2022-07-28T00:41:40","slug":"x86%e6%b1%87%e7%bc%96%e5%85%a5%e9%97%a8-%e5%af%84%e5%ad%98%e5%99%a832%e4%bd%8d","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=1035","title":{"rendered":"X86\u6c47\u7f16\u5165\u95e8-\u5bc4\u5b58\u566832\u4f4d"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u5982\u679c\u7a0b\u5e8f\u8fd0\u884c\u5728 32\u4f4d \u6a21\u5f0f\u4e0b\uff0c\u5e38\u7528\u7684\u5bc4\u5b58\u5668\uff08register\uff09\u6709\u4ee5\u4e0b8\u4e2a\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>EAX\uff0cEAX \u662f <strong>\u7d2f\u52a0\u5668<\/strong> \uff08accumulator\uff09, \u5b83\u662f\u5f88\u591a\u52a0\u6cd5\u4e58\u6cd5\u6307\u4ee4\u7684\u7f3a\u7701\u5bc4\u5b58\u5668\u3002<\/li><li>EBX\uff0cEBX \u662f <strong>\u57fa\u5730\u5740<\/strong>\uff08base\uff09\u5bc4\u5b58\u5668, \u5728\u5185\u5b58\u5bfb\u5740\u65f6\u5b58\u653e\u57fa\u5730\u5740\u3002<\/li><li>ECX\uff0cECX \u662f <strong>\u8ba1\u6570\u5668<\/strong>\uff08counter\uff09\uff0c \u662f\u91cd\u590d\uff08REP\uff09\u524d\u7f00\u6307\u4ee4\u548cLOOP\u6307\u4ee4\u7684\u5185\u5b9a\u8ba1\u6570\u5668\u3002<\/li><li>EDX\uff0cEDX \u603b\u662f\u88ab\u7528\u6765\u653e\u6574\u6570\u9664\u6cd5\u4ea7\u751f\u7684\u4f59\u6570\u3002<\/li><li>EBP\uff0cEBP\u662f <strong>\u57fa\u5740\u6307\u9488<\/strong>\uff08BASE POINTER\uff09\uff0c \u8f6f\u4ef6\u7834\u89e3\u9886\u57df \u7ecf\u5e38\u7528\u5230\u8fd9\u4e2a \u57fa\u5740<\/li><li>ESP \uff0cESP \u662f <strong>\u5806\u6808\u6307\u9488<\/strong>\uff08stack point\uff09<\/li><li>ESI\/EDI\uff0c\u5206\u522b\u53eb\u505a <strong>\u6e90\/\u76ee\u6807\u7d22\u5f15\u5bc4\u5b58\u5668<\/strong>\uff08source\/destination index\uff09\uff0c\u56e0\u4e3a\u5728\u5f88\u591a\u5b57\u7b26\u4e32\u64cd\u4f5c\u6307\u4ee4\u4e2d\uff0c<code class=\"prettyprint\" >DS:ESI<\/code> \u6307\u5411\u6e90\u4e32\uff0c\u800c <code>ES:EDI<\/code> \u6307\u5411\u76ee\u6807\u4e32\u3002\u8fd9\u53e5\u8bdd\u6211\u4e5f\u4e0d\u660e\u767d<\/li><\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u5171\u6709 8 \u4e2a <strong>\u901a\u7528<\/strong> \u5bc4\u5b58\u5668\uff0c\u4ec0\u4e48\u662f<strong>\u901a\u7528<\/strong>\uff1f \u5c31\u662f EAX \u5bc4\u5b58\u5668\u53ef\u4ee5\u5e72 EBX \u5bc4\u5b58\u5668\u7684\u6d3b\u3002\u4ed6\u4eec\u5176\u5b9e\u90fd\u662f\u540c\u4e00\u79cd\u5bc4\u5b58\u5668\uff0cCPU \u63d0\u4f9b\u7684\u5bc4\u5b58\u5668\uff0c\u53ea\u662f\u4ece\u4f7f\u7528\u4e60\u60ef\u4e0a EAX \u53eb EAX\u3002\u4e58\u6cd5\u6307\u4ee4 \u80fd\u4e0d\u80fd\u7528 EBX \u5bc4\u5b58\u5668\uff1f\u4e5f\u662f\u53ef\u4ee5\u7684\uff0c\u53ea\u662f\u4f7f\u7528\u4e60\u60ef\u4e0a\u6ca1\u8fd9\u4e48\u641e\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">google_ads_content<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0d\u719f\u6089 AT&amp;T \u6c47\u7f16\u8bed\u6cd5\u7684\u53ef\u4ee5\u5148\u5feb\u901f\u770b\u4e00\u904d \u5b98\u65b9\u6587\u6863 <a href=\"https:\/\/ftp.gnu.org\/old-gnu\/Manuals\/gas-2.9.1\/html_node\/as_toc.html\">\u300aUsing as-The GNU Assembler\u300b<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u76f8\u5e94\u7684 X86 \u6307\u4ee4\u53ef\u4ee5\u67e5 \u300a\u82f1\u7279\u5c14\u00ae 64 \u4f4d\u548c IA-32 \u67b6\u6784\u5f00\u53d1\u4eba\u5458\u624b\u518c\u300b\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li><a href=\"https:\/\/www.intel.cn\/content\/www\/cn\/zh\/architecture-and-technology\/64-ia-32-architectures-software-developer-vol-1-manual.html\">\u300a\u82f1\u7279\u5c14\u00ae 64 \u4f4d\u548c IA-32 \u67b6\u6784\u5f00\u53d1\u4eba\u5458\u624b\u518c\uff1a\u5377 1\u300b<\/a><\/li><li><a href=\"https:\/\/www.intel.cn\/content\/www\/cn\/zh\/architecture-and-technology\/64-ia-32-architectures-software-developer-vol-2a-manual.html\">\u300a\u82f1\u7279\u5c14\u00ae 64 \u4f4d\u548c IA-32 \u67b6\u6784\u5f00\u53d1\u4eba\u5458\u624b\u518c\uff1a\u5377 2A\u300b<\/a><\/li><\/ol>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">\u5148\u7b80\u5355\u8bb2\u89e3 \u4e00\u4e0b EAX \u5bc4\u5b58\u5668\u7684\u4f7f\u7528\u3002C\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >int main() {\n    int a = 1;\n    a = a + 8;\n    return a;\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u7528\u6c47\u7f16\u4ee3\u7801\u5b9e\u73b0 \u8ddf \u4e0a\u9762 C\u4ee3\u7801\u4e00\u6837\u7684\u529f\u80fd\uff0c\u6c47\u7f16\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >        .text\n        .globl  main\n        .type   main, @function\nmain:\n.LFB0:\n        pushl   %ebp\n        movl    %esp, %ebp\n        movl    $1, %eax\n        addl    $8, %eax\n        popl    %ebp\n        ret<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0a\u9762\u7684\u6c47\u7f16\u4ee3\u7801 \u6d41\u7a0b\u5982\u4e0b\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1\uff0c<code class=\"prettyprint\" >pushl<\/code> \u538b\u6808<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">2\uff0c\u628a 1 \u8fd9\u4e2a\u503c \u5b58\u50a8\u5728 eax \u5bc4\u5b58\u5668\uff0c\u7136\u540e\u7528 <code class=\"prettyprint\" >addl<\/code> \u6307\u4ee4\u628a eax \u5bc4\u5b58\u5668 + 8<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">3\uff0cpop <code class=\"prettyprint\" >\u5f39\u6808<\/code>\uff0c\u8fd4\u56de\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u4e2a\u7a0b\u5e8f\u8fd4\u56de\u7684\u65f6\u5019\uff0ceax \u91cc\u9762\u7684\u503c\u5c31\u662f\u8fd9\u4e2a\u7a0b\u5e8f\u7684\u8fd4\u56de\u503c\uff0clinux \u4e0b \u7528 <code class=\"prettyprint\" >echo $?<\/code> \u53ef\u4ee5\u770b\u5230\u4e0a\u4e00\u6761\u547d\u4ee4\u7684\u8fd4\u56de\u503c\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u73b0\u5728\u7f16\u8bd1\u4e00\u4e0b\u4e0a\u9762\u7684 \u6c47\u7f16\u4ee3\u7801\uff0c\u5728 64\u4f4d \u7684 ubuntu\u4e0b\u8981 \u52a0\u4e0a <code class=\"prettyprint\" >-m32<\/code> \u624d\u80fd\u7f16\u8bd1\u6210\u53ef\u6267\u884c\u6587\u4ef6\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >gcc -m32 -o main32 main-32.s<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"739\" height=\"144\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/x86-3-0-2.png\" alt=\"\" class=\"wp-image-1046\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u53ef\u4ee5\u770b\u5230 \u8fd4\u56de\u503c\u662f 9\uff0c\u4ee5\u4e0a\u7684\u6c47\u7f16\u7a0b\u5e8f\u6ca1\u6709\u95ee\u9898\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">\u63a5\u4e0b\u6765\u7528 gdb \u7b80\u5355\u8c03\u8bd5\u4e00\u4e0b\u4e0a\u9762\u8fd9\u6bb5\u6c47\u7f16\u4ee3\u7801\uff0c\u4e0d\u719f\u6089 gdb \u7684\u53ef\u4ee5\u5148\u770b\u4ee5\u4e0b\u6559\u7a0b\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li><a href=\"https:\/\/sourceware.org\/gdb\/current\/onlinedocs\/gdb\/\">\u300aGDB\u5b98\u7f51\u624b\u518c\u300b<\/a><\/li><li><\/li><\/ol>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u6267\u884c\u4ee5\u4e0b\u547d\u4ee4\u8fdb\u5165 gdb \u8c03\u8bd5<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" ># \u8fd0\u884c gdb\ngdb .\/main32\n# \u663e\u793a\u5bc4\u5b58\u5668\u7a97\u53e3\nlayout regs\n# \u81ea\u52a8\u53cd\u6c47\u7f16\u540e\u9762\u8981\u6267\u884c\u7684\u4ee3\u7801\nset disassemble-next-line on\n# \u8bbe\u7f6e main \u7b2c\u4e00\u6761\u6c47\u7f16\u65ad\u70b9\nb *main\n# \u67e5\u770b\u6c47\u7f16\u4ee3\u7801\ndisassemble\n# \u67e5\u770b\u5bc4\u5b58\u5668\u7684\u503c\ni registers<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"991\" height=\"696\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/x86-3-0-3.png\" alt=\"\" class=\"wp-image-1047\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>GDB \u8c03\u8bd5\u6280\u5de7\uff1a<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>GDB \u8c03\u8bd5 C\u8bed\u8a00 \u7528\u7684\u662f s\uff08step\uff09 \u8ddf n\uff08next\uff09\uff0c\u5355\u6b65\u8c03\u8bd5\u6c47\u7f16\u662f <code class=\"prettyprint\" >si<\/code> \u8ddf <code>ni<\/code> \u3002<\/li><\/ol>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0b\u9762\u5f00\u59cb\u4e00\u884c\u4e00\u884c\u4ee3\u7801\u8bb2\u89e3\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >    .text\n    .globl  main\n    .type   main, @function<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">1\uff0c<a href=\"https:\/\/ftp.gnu.org\/old-gnu\/Manuals\/gas-2.9.1\/html_node\/as_129.html#SEC131\"><code class=\"prettyprint\" >.text<\/code><\/a>\uff0cTells <code>as<\/code> to assemble the following statements onto the end of the text subsection numbered subsection, which is an absolute expression. If subsection is omitted, subsection number zero is used.\uff08\u5b98\u7f51\u6ce8\u91ca\uff0c\u6211\u4e5f\u4e0d\u61c2\uff09<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">2\uff0c<a href=\"https:\/\/ftp.gnu.org\/old-gnu\/Manuals\/gas-2.9.1\/html_node\/as_91.html#SEC93\"><code class=\"prettyprint\" >.globl<\/code><\/a>\uff0c\u5e94\u8be5\u662f\u544a\u8bc9 \u94fe\u63a5\u5668 <code>ld<\/code> \u4e00\u4e9b\u4fe1\u606f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">3\uff0c<a href=\"https:\/\/ftp.gnu.org\/old-gnu\/Manuals\/gas-2.9.1\/html_node\/as_131.html#SEC133\"><code class=\"prettyprint\" >.type<\/code><\/a>\uff0c<code>.type main, @function<\/code> \u8fd9\u4e2a\u662f\u5b9a\u4e49\u4e00\u4e2a main \u51fd\u6570\uff0c\u6c47\u7f16\u91cc\u9762\u4e5f\u6709\u51fd\u6570\uff0c\u63a8\u8350\u9605\u8bfb <a href=\"https:\/\/blog.csdn.net\/qq_35728402\/article\/details\/105308718\">\u300aAT&amp;T \u51fd\u6570\u5b9a\u4e49\u300b<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0a\u9762\u7684 \u6c47\u7f16\u4ee3\u7801\uff0c<code class=\"prettyprint\" >.file<\/code>\uff0c<code>.text<\/code>\uff0c<code>.globl<\/code> \u7b49\u8fd9\u4e9b\uff0c\u5176\u5b9e\u662f\u4f2a\u6307\u4ee4\uff08<a href=\"https:\/\/ftp.gnu.org\/old-gnu\/Manuals\/gas-2.9.1\/html_node\/as_65.html#SEC67\">Assembler Directives<\/a>\uff09\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f2a\u6307\u4ee4 \u662f\u6c47\u7f16\u5668 \u641e\u51fa\u6765\u7684\u4e1c\u897f\uff0c\u4e0d\u662fCPU\u6307\u4ee4\u96c6\u63d0\u4f9b\u7684\uff0c\u4f60\u53ef\u4ee5\u7406\u89e3\u4e3a \u4f2a\u6307\u4ee4 \u662f\u57fa\u4e8e CPU\u6307\u4ee4\u96c6 \u5c01\u88c5\u7684\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0d\u4f2a\u7684\u6307\u4ee4\u5c31\u662f CPU \u6307\u4ee4\u96c6\uff0c<code class=\"prettyprint\" >pushl %rbp<\/code> \u8fd9\u79cd\u5c31\u662f\u771f\u6b63\u7684\u6307\u4ee4\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b9e\u9645\u4e0a\uff0c\u4f2a\u6307\u4ee4 \u8ddf \u771f\u6b63\u7684\u6307\u4ee4\uff0c\u4f60\u7528\u6c47\u7f16\u7684\u65f6\u5019\uff0c\u662f\u6ca1\u6709\u611f\u77e5\u7684\u3002\u53ea\u662f\u5185\u90e8\u5b9e\u73b0\u6709\u533a\u522b\uff0c\u6240\u4ee5\u628a\u8fd9\u4e24\u4e2a\u4e1c\u897f\u770b\u6210\u4e00\u4e2a\u4e1c\u897f\u5c31\u884c\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >main:\n.LFB0:\n        pushl   %ebp\n        movl    %esp, %ebp\n        movl    $1, %eax\n        addl    $8, %eax\n        popl    %ebp\n        ret<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">1\uff0c<code class=\"prettyprint\" >main:<\/code> \u4e4b\u524d\u7528 type \u5b9a\u4e49\u4e86\u4e00\u4e2a main \u51fd\u6570<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">2\uff0c<code class=\"prettyprint\" >.LFB0:<\/code> \u662f\u4e00\u4e2a label\u3002\u628a\u5b83\u7406\u89e3\u6210 C\u8bed\u8a00\u7684 <code>goto<\/code> \u7684\u6807\u8bb0\u5c31\u884c\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">3\uff0c<code class=\"prettyprint\" >pushl %ebp<\/code> \u628a <code>ebp<\/code> \u5bc4\u5b58\u5668\u7684\u503c \u538b\u8fdb\u53bb <code>esp<\/code> \u5bc4\u5b58\u5668\uff0c\u4e0d\u7528\u5199\u4e0a <code>esp<\/code>\uff0c<code>push<\/code> \u6307\u4ee4\u9ed8\u8ba4\u5c31\u662f\u5b58\u5230 <code>esp<\/code> \u7684\u3002\u538b\u8fdb\u53bb\u4e4b\u540e\uff0c<code>esp<\/code> \u5c31\u4f1a\u51cf 4\u4e2a\u5b57\u8282\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code class=\"prettyprint\" >pushl %ebp<\/code> \u6ca1\u6267\u884c\u4e4b\u524d\uff0cebp \u7684\u503c\u662f <code>0x0<\/code>\uff0c<code>esp<\/code> \u662f <code>0xffffd34c<\/code>\u3002\u6267\u884c\u4e4b\u540e <code>esp<\/code> \u662f <code>0xffffd348<\/code>\u3002\u5185\u5b58\u91cc\u9762\u7684 <code>0xffffd348<\/code> ~ <code>0xffffd34c<\/code> 4\u4e2a\u5b57\u8282\u7684\u6570\u636e\u5c31\u662f ebp \u7684\u503c\uff0c\u4e5f\u5c31\u662f 0x0\u3002\u53ef\u4ee5\u7528\u547d\u4ee4 <code>x \/20xh 0xffffd348<\/code> \u6253\u5370\u51fa\u6765\uff0c\u5982\u4e0b\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"896\" height=\"543\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/x86-3-0-4.png\" alt=\"\" class=\"wp-image-1044\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u6ce8\u610f\uff0c<code class=\"prettyprint\" >esp<\/code> \u53ea\u662f\u4e00\u4e2a\u6307\u5411\u5185\u5b58\u7684\u6307\u9488\uff0c<code>esp<\/code> \u4e0d\u5b58\u50a8\u5b9e\u9645\u7684\u6570\u636e\uff0c\u5b9e\u9645\u7684\u6570\u636e\u5728\u5b83\u6307\u5411\u7684\u5185\u5b58\u5730\u5740\u3002<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">4\uff0c<code class=\"prettyprint\" >movl %esp, %ebp<\/code> \uff0c\u628a esp \u7684\u503c \u590d\u5236\u5230 ebp\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">5\uff0c<code class=\"prettyprint\" >movl $1, %eax<\/code>\uff0c\u628a\u53d8\u91cf 1 \u5b58\u8fdb\u53bb <code>eax<\/code> \u5bc4\u5b58\u5668<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">6\uff0c<code class=\"prettyprint\" >addl $8, %eax<\/code>\uff0c\u628a <code>eax<\/code> \u5bc4\u5b58\u5668\u7684\u503c\u52a0\u4e0a 8<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">7\uff0c<code class=\"prettyprint\" >popl %ebp<\/code>\uff0c\u628a esp \u6307\u5411\u76844\u5b57\u8282\u5185\u5b58\u62f7\u8d1d\u5230 ebp \u5bc4\u5b58\u5668\uff0c4\u5b57\u8282\u5185\u5bb9 \u662f\u4e4b\u524d\u7684 0x0\uff0c\u7136\u540e esp + 4\u5b57\u8282\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7b2c 7 \u6761\u6307\u4ee4 \u6267\u884c\u5b8c\u4e4b\u540e\uff0c<code class=\"prettyprint\" >esp<\/code> <code>ebp<\/code> \u5c31\u56de\u5230\u8fd8\u6ca1\u6267\u884c\u7b2c\u4e00\u6761\u6c47\u7f16\u7684\u65f6\u5019\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u65e2\u7136\u90fd\u56de\u5230\u4e86 \u7b2c\u4e00\u6761\u6c47\u7f16\u4e4b\u524d\u7684\u72b6\u6001\uff0c\u90a3 \u6700\u540e\u7684 <code class=\"prettyprint\" >ret<\/code> \u6307\u4ee4\u662f\u5e72\u4ec0\u4e48\u7684\u5462\uff1f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u56e0\u4e3a\u6211\u4eec\u7684\u6c47\u7f16\u7a0b\u5e8f\uff0c\u662f\u8fd0\u884c\u5728 <code class=\"prettyprint\" >\/lib32\/libc.so<\/code> C\u8bed\u8a00\u7684\u8fd0\u884c\u65f6\u5e93\u91cc\u9762\u7684\uff0c\u4e5f\u5c31\u662f <code>libc.so<\/code> \u8c03\u7528\u4e86 <code>CALL<\/code> \u6267\u884c\u6211\u4eec\u7684\u6c47\u7f16\u7a0b\u5e8f <code>main-32<\/code>\uff0c\u6211\u4eec\u7684 <code>main-32<\/code> \u76f8\u5f53\u4e8e\u4e00\u4e2a\u5b50\u51fd\u6570\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code class=\"prettyprint\" >libc.so<\/code> \u5728\u8c03\u7528 <code>main-32<\/code> \u4e4b\u524d\uff0c\u5df2\u7ecf\u628a\u5b83\u5f53\u65f6\u7684\u6307\u4ee4\u4f4d\u7f6e\u538b\u8fdb\u53bb esp \u91cc\u9762\u4e86\u3002\u4e5f\u5c31\u662f <code>0xffffd34c<\/code> ~ <code>0xffffd350<\/code> \u5b58\u7684\u662f <code>libc.so<\/code> \u7684\u6307\u4ee4\u4f4d\u7f6e\uff0c<code>main-32<\/code> \u6267\u884c\u5b8c\u4e4b\u540e\uff0c\u8981\u8df3\u8f6c\u5230\u8fd9\u4e2a\u4f4d\u7f6e\u3002\u8fd9\u4e2a\u8df3\u8f6c \u5c31\u662f\u7528 <code>ret<\/code> \u6307\u4ee4\u6267\u884c\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">ret \u5e72\u7684\u6d3b \u5982\u4e0b\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1\uff0c\u628a <code class=\"prettyprint\" >0xffffd34c<\/code> ~ <code>0xffffd350<\/code>\u7684\u6570\u636e\u62ff\u51fa\u6765\uff0c\u5b58\u5230 <code>eip<\/code> \u5bc4\u5b58\u5668\uff0c <code>eip<\/code> \u5bc4\u5b58\u5668\u6c38\u8fdc\u6307\u5411\u4e0b\u4e00\u6761\u8981\u6267\u884c\u7684\u6307\u4ee4\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">2\uff0c\u628a <code class=\"prettyprint\" >esp<\/code> \u52a0 4\u4e2a\u5b57\u8282\uff0c<code>esp<\/code> \u5c31\u4f1a\u53d8\u6210 <code>0xffffd350<\/code><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u6837\u505a\u5b8c\u4e4b\u540e\uff0c\u7a0b\u5e8f\u5c31\u4f1a\u8df3\u56de\u53bb <code class=\"prettyprint\" >libc.so<\/code> \u90a3\u91cc\u4e86\u3002\u5982\u4e0b\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"995\" height=\"660\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/x86-3-0-5.png\" alt=\"\" class=\"wp-image-1045\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u91cd\u70b9\uff1a<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1\uff0cAT&amp;T \u7684\u6c47\u7f16\u8bed\u6cd5\uff0c\u6570\u5b57\u524d\u9762\u8981\u52a0 <code class=\"prettyprint\" >$<\/code>\uff0c\u5bc4\u5b58\u5668\u524d\u9762\u8981\u52a0 <code>%<\/code><\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">\u518d\u8bb2\u4e00\u4e2a\u6269\u5c55\u77e5\u8bc6\u70b9\uff0c\u5982\u4f55 \u67e5\u770b \u6c47\u7f16\u4ee3\u7801 \u6700\u540e\u7f16\u8bd1\u6210\u7684 \u673a\u5668\u6307\u4ee4\u662f\u4ec0\u4e48\uff1f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u89e3\u7b54\uff1a\u76f4\u63a5 \u770b eip \u5bc4\u5b58\u5668\u6307\u5411\u7684\u5730\u5740\uff0c\u5982\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"964\" height=\"651\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/x86-3-0-6.png\" alt=\"\" class=\"wp-image-1058\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0a\u56fe\u4e2d\uff0c\u4e0b\u4e00\u6761\u8981\u6267\u884c\u7684 \u6c47\u7f16\u6307\u4ee4\u662f <code class=\"prettyprint\" >movl $1, %eax<\/code>\uff0c\u6b64\u65f6 eip \u6307\u5411\u7684\u5730\u5740\u662f <code>0x565561a0<\/code>\uff0c\u518d\u4e0b\u4e00\u4e2a\u6307\u4ee4 <code>addl $8, %eax<\/code> \u7684\u5730\u5740\u662f <code>0x565561a5<\/code>\uff0c<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u4ee5\u63a8\u7b97\u5f97\u77e5 \uff0c<code class=\"prettyprint\" >movl $1, %eax<\/code> \u7ffb\u8bd1\u6210\u7684\u673a\u5668\u6307\u4ee4 \u53605\u4e2a\u5b57\u8282\u3002\u73b0\u5728\u53ea\u9700\u8981\u6253\u5370\u5185\u5b58\u5730\u5740 0x565561a0 ~ 0x565561a5 \u5c31\u80fd\u770b\u5230\u771f\u6b63\u7684\u673a\u5668\u6307\u4ee4\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6267\u884c\u4ee5\u4e0b \u547d\u4ee4\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >x \/5xb 0x565561a0 <\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"968\" height=\"532\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/x86-3-0-7.png\" alt=\"\" class=\"wp-image-1056\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u4e0a\u56fe\u6240\u793a\uff0c<code class=\"prettyprint\" >movl $1, %eax<\/code> \u5bf9\u5e94\u7684\u673a\u5668\u6307\u4ee4\u662f b8 01 00 00 00\uff0c<code>b8<\/code> \u662f\u6307\u4ee4\uff0c\u540e\u9762\u7684 4\u5b57\u8282\u662f\u503c\uff0c\u503c\u662f1\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">\u73b0\u5728\u5e94\u7528\u5c42\u7684\u6c47\u7f16\u4f18\u5316\uff0c\u901a\u5e38\u90fd\u662f\u5728 64 \u4f4d\u4e0b\u9762\u505a\u7684\u3002 32 \u4f4d\u672c\u6765\u5c31\u6ca1\u670964\u4f4d \u5feb\uff0c\u7528\u6c47\u7f16\u4e5f\u53ea\u662f\u5904\u7406\u4e00\u4e9b <code class=\"prettyprint\" >gcc<\/code> \u7f16\u8bd1\u4f18\u5316\u6ca1\u6709\u987e\u53ca\u5230\u7684\u5730\u65b9\uff0c\u60f3\u8ba9\u7a0b\u5e8f\u66f4\u5feb\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u800c\u4e14\u73b0\u5728\u5927\u90e8\u5206\u673a\u5668\u90fd\u662f 64 \u4f4d\uff0c\u505a\u6c47\u7f16\u4f18\u5316\u662f\u9700\u8981\u7814\u53d1\u6210\u672c\u7684\uff0c\u901a\u5e38\u4e0d\u4f1a \u4e3a\u4e86\u4e00\u4e2a 32 \u4f4d\u7684\u7a0b\u5e8f\u53bb\u4f7f\u7528\u6c47\u7f16\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u4ee5\u672c\u4e66\uff0c\u53ea\u662f\u63d0\u53ca\u4e00\u4e0b 32 \u4f4d\u7684\u6c47\u7f16\u4e00\u70b9\u70b9\u77e5\u8bc6\uff0c\u540e\u7eed\u7684\u6c47\u7f16\u4ee3\u7801\u90fd\u662f\u57fa\u4e8e 64\u4f4d\u7684\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">\u76f8\u5173\u9605\u8bfb\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li><a href=\"https:\/\/www.cnblogs.com\/qq78292959\/archive\/2012\/07\/20\/2600865.html\">EAX\u3001ECX\u3001EDX\u3001EBX\u5bc4\u5b58\u5668\u7684\u4f5c\u7528<\/a><\/li><li><a href=\"https:\/\/www.codetd.com\/article\/10611686\">\u300aUsing as-The GNU Assembler\u300b<\/a><\/li><li><a href=\"https:\/\/www.intel.cn\/content\/www\/cn\/zh\/architecture-and-technology\/64-ia-32-architectures-software-developer-vol-1-manual.html\">\u300a\u82f1\u7279\u5c14\u00ae 64 \u4f4d\u548c IA-32 \u67b6\u6784\u5f00\u53d1\u4eba\u5458\u624b\u518c\uff1a\u5377 1\u300b<\/a><\/li><li><a href=\"https:\/\/www.intel.cn\/content\/www\/cn\/zh\/architecture-and-technology\/64-ia-32-architectures-software-developer-vol-2a-manual.html\">\u300a\u82f1\u7279\u5c14\u00ae 64 \u4f4d\u548c IA-32 \u67b6\u6784\u5f00\u53d1\u4eba\u5458\u624b\u518c\uff1a\u5377 2A\u300b<\/a><\/li><\/ol>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">\u7531\u4e8e\u7b14\u8005\u7684\u6c34\u5e73\u6709\u9650\uff0c \u52a0\u4e4b\u7f16\u5199\u7684\u540c\u65f6\u8fd8\u8981\u53c2\u4e0e\u5f00\u53d1\u5de5\u4f5c\uff0c\u6587\u4e2d\u96be\u514d\u4f1a\u51fa\u73b0\u4e00\u4e9b\u9519\u8bef\u6216\u8005\u4e0d\u51c6\u786e\u7684\u5730\u65b9\uff0c\u6073\u8bf7\u8bfb\u8005\u6279\u8bc4\u6307\u6b63\u3002\u5982\u679c\u8bfb\u8005\u6709\u4efb\u4f55\u5b9d\u8d35\u610f\u89c1\uff0c\u53ef\u4ee5\u52a0\u6211\u5fae\u4fe1 Loken1\u3002QQ\uff1a2338195090\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5982\u679c\u7a0b\u5e8f\u8fd0\u884c\u5728 32\u4f4d \u6a21\u5f0f\u4e0b\uff0c\u5e38\u7528\u7684\u5bc4\u5b58\u5668\uff08register\uff09\u6709\u4ee5\u4e0b8\u4e2a\u3002 EAX\uff0cEAX \u662f \u7d2f\u52a0\u5668 \uff08a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23],"tags":[],"class_list":["post-1035","post","type-post","status-publish","format-standard","hentry","category-assembly"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>X86\u6c47\u7f16\u5165\u95e8-\u5bc4\u5b58\u566832\u4f4d - \u5f26\u5916\u4e4b\u97f3<\/title>\n<meta name=\"description\" content=\"X86\u6c47\u7f16\u5165\u95e8-\u5bc4\u5b58\u566832\u4f4d\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.xianwaizhiyin.net\/?p=1035\" 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