{"id":1085,"date":"2022-03-02T13:05:52","date_gmt":"2022-03-02T05:05:52","guid":{"rendered":"https:\/\/www.xianwaizhiyin.net\/?p=1085"},"modified":"2022-06-11T02:33:46","modified_gmt":"2022-06-10T18:33:46","slug":"x86%e6%b1%87%e7%bc%96%e5%85%a5%e9%97%a8-%e6%9c%ba%e5%99%a8%e7%a0%81","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=1085","title":{"rendered":"X86\u6c47\u7f16\u5165\u95e8-\u673a\u5668\u7801"},"content":{"rendered":"\n<p>\u672c\u6587\u4e3b\u8981\u8bb2\u89e3 \u4e24\u4e2a\u91cd\u70b9\u3002<\/p>\n\n\n\n<p>1\uff0c\u6c47\u7f16\u4ee3\u7801 \u5bf9\u5e94\u7684 \u673a\u5668\u7801\u662f\u600e\u4e48\u6837\u7684<\/p>\n\n\n\n<p>2\uff0c\u4e3a\u4ec0\u4e48\u7528\u6c47\u7f16\u5b9e\u73b0\u67d0\u4e9b\u529f\u80fd\u4f1a\u6bd4 C\u8bed\u8a00 \u6027\u80fd\u597d\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>google_ads_content<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>C\u8bed\u8a00\u4ee3\u7801\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >int add_two(int a,int b){\n    return a+b;\n}\nint main() {\n    int return_num = add_two(1,8);\n    return return_num - 3;\n}<\/code><\/pre>\n\n\n\n<p>\u6c47\u7f16\u4ee3\u7801\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >        .text\n        .globl  main\n        .type   main, @function\n        .type   add_two, @function\nadd_two:\n        movl    %ebx, %eax\n        addl    %ecx, %eax\n        ret\nmain:\n        pushl   %ebp\n        movl    %esp, %ebp\n        \/* \u4e24\u4e2a\u53c2\u6570 \u5206\u522b\u4f20\u8fdb\u53bb ebx \uff0cecx\uff0c\u6240\u4ee5\u9700\u8981\u5148 \u4fdd\u5b58 ebx \uff0cecx \u7684\u65e7\u503c\u8fdb\u53bb \u5806\u6808\u3002 *\/\n        pushl   %ebx\n        pushl   %ecx\n        \/* \u5f00\u59cb\u5bc4\u5b58\u5668\u4f20\u53c2\uff0c \u53c2\u6570 1 \u4e22\u8fdb\u53bb ebx\uff0c\u53c2\u6570 8 \u4e22\u8fdb\u53bb ecx *\/\n        movl    $1, %ebx\n        movl    $8, %ecx\n        call    add_two\n        \/* \u4ece\u5806\u6808\u6062\u590d ecx ebx\u7684\u503c *\/\n        popl    %ecx\n        popl    %ebx\n        \/* \u8fd4\u56de\u503c\u51cf 3 *\/\n        subl    $3, %eax\n        popl    %ebp\n        ret<\/code><\/pre>\n\n\n\n<p>\u6267\u884c\u4ee5\u4e0b\u547d\u4ee4\uff0c\u7f16\u8bd1\uff0c\u8c03\u8bd5 \u6c47\u7f16\u53ef\u6267\u884c\u6587\u4ef6\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >gcc -m32 -o main-32 main-32.s\n# \u8fd0\u884c gdb\ngdb .\/main-32\n# \u663e\u793a\u5bc4\u5b58\u5668\u7a97\u53e3\nlayout regs\n# \u65ad\u70b9\nb *main<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"660\" height=\"589\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/x86-5-0.png\" alt=\"\" class=\"wp-image-1087\"\/><\/figure>\n\n\n\n<p>\u6c47\u7f16\u4ee3\u7801\uff0c\u662f\u4e00\u6761 \u6c47\u7f16 \u6307\u4ee4 \u5c31\u5bf9\u5e94 \u4e00\u6761\u673a\u5668\u6307\u4ee4\uff0c\u6240\u4ee5\u4ece\u4e0a\u56fe\u770b\u6765\uff0cmain \u51fd\u6570\u5360 12\u6761\u6307\u4ee4\uff0cadd_two \u51fd\u6570\u5360 3 \u6761\u6307\u4ee4\uff0c\u52a0\u8d77\u6765\uff0cCPU \u8fd0\u884c \u6c47\u7f16\u7a0b\u5e8f \u53ea\u9700\u8981 <strong>15\u6761\u6307\u4ee4<\/strong>\u5c31\u53ef\u4ee5\u4e86\u3002<\/p>\n\n\n\n<p>\u7531\u4e8e <code class=\"prettyprint\" >eip<\/code> \u5bc4\u5b58\u5668\u6307\u5411 <code>0x565561a6<\/code> \uff0c\u6240\u4ee5 <code>mian<\/code> \u51fd\u6570\u7684 \u673a\u5668\u7801\u5c31\u5728 <code>0x565561a6<\/code> ~ <code>0x565561c0<\/code> \u7684\u4f4d\u7f6e\uff0c\u4e00\u5171 0x1A \u5b57\u8282\u5927\u5c0f\u3002<\/p>\n\n\n\n<p>\u6c47\u7f16 \u8ddf \u673a\u5668\u7801 \u8868\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u6c47\u7f16\u4ee3\u7801<\/th><th>\u4f4d\u7f6e<\/th><th>\u5360\u7528\u5b57\u8282\u6570<\/th><th>\u673a\u5668\u7801 \uff08\u5927\u7aef\u5e8f\uff09<\/th><\/tr><\/thead><tbody><tr><td><code class=\"prettyprint\" >pushl %ebp<\/code><\/td><td>0x565561a6 ~ 0x565561a7<\/td><td>1<\/td><td>0x55<\/td><\/tr><tr><td><code>addl %ecx, %eax<\/code><\/td><td>0x565561a7 ~ 0x565561a9<\/td><td>2<\/td><td>0xe5 0x89<\/td><\/tr><tr><td><code>pushl %ebx<\/code><\/td><td>0x565561a9 ~ 0x565561aa<\/td><td>1<\/td><td>0x53<\/td><\/tr><tr><td><code>pushl %ecx<\/code><\/td><td>0x565561aa ~ 0x565561ab<\/td><td>1<\/td><td>0x51<\/td><\/tr><tr><td><code>movl $1, %ebx<\/code><\/td><td>0x565561ab ~ 0x565561b0<\/td><td>5<\/td><td>0x00 0x00 0x00 0x01 0xbb<\/td><\/tr><tr><td><code>movl $8, %ecx<\/code><\/td><td>0x565561b0 ~ 0x565561b5<\/td><td>5<\/td><td>0x00 0x00 0x00 0x08 0xb9<\/td><\/tr><tr><td><code>call add_two<\/code><\/td><td>0x565561b5 ~ 0x565561ba<\/td><td>5<\/td><td>0xff 0xff 0xff 0xe3 0xe8<\/td><\/tr><tr><td>\u7701\u7565.....<\/td><td>0x565561ba ~ 0x565561bf<\/td><td>5<\/td><td><\/td><\/tr><tr><td><code>popl %ebp<\/code><\/td><td>0x565561bf ~ 0x565561c0<\/td><td>1<\/td><td>0x5d<\/td><\/tr><tr><td><code>ret<\/code><\/td><td>0x565561c0 ~ 0x565561c1<\/td><td>1<\/td><td>0xc3<\/td><\/tr><tr><td>\u4e00\u5171<\/td><td><\/td><td>27<\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>\u673a\u5668\u7801\u539f\u6765\u662f \u5c0f\u7aef\u5e8f\u7684\uff0c\u8868\u683c\u4e3a\u4e86\u65b9\u4fbf\u67e5\u770b\uff0c\u6539\u6210\u5927\u7aef\u5e8f\u3002<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u73b0\u5728 \u518d\u6765\u770b\u770b \u5982\u679c\u628a \u4e4b\u524d\u7684 C\u8bed\u8a00\u4ee3\u7801 \u7f16\u8bd1\u6210 \u6c47\u7f16\u4ee3\u7801\uff0c\u4f1a\u6709\u591a\u5c11\u6761\u6307\u4ee4\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >int add_two(int a,int b){\n    return a+b;\n}\nint main() {\n    int return_num = add_two(1,8);\n    return return_num - 3;\n}<\/code><\/pre>\n\n\n\n<p>\u6267\u884c\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >gcc -m32 -o main-32-c main-32.c\n# \u8fd0\u884c gdb\ngdb .\/main-32-c\n# \u663e\u793a\u5bc4\u5b58\u5668\u7a97\u53e3\nlayout regs\n# \u65ad\u70b9\nb *main<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"752\" height=\"425\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/x86-5-0-1.png\" alt=\"\" class=\"wp-image-1088\"\/><\/figure>\n\n\n\n<p>\u4ece\u4e0a\u56fe\u53ef\u4ee5\u770b\u51fa\uff0c<code class=\"prettyprint\" >main<\/code> \u51fd\u6570 <strong>15 \u6761<\/strong>\u6307\u4ee4\uff0cadd_two \u51fd\u6570 <strong>10 \u6761<\/strong>\u6307\u4ee4\uff0cC\u8bed\u8a00\u4ee3\u7801 \u6bd4 \u6c47\u7f16\u4ee3\u7801\u591a\u4e86 <strong>10\u6761<\/strong>\u6307\u4ee4\u3002\u8fd9\u8fd8\u53ea\u662f \u6211\u4eec\u7684C\u4ee3\u7801\u7684\u6307\u4ee4\u6761\u6570\uff0c\u6ce8\u610f C\u4ee3\u7801\u662f\u8fd0\u884c\u5728 <code>\/lib32\/libc.so<\/code> \u8fd0\u884c\u65f6\u5e93\u91cc\u9762\u7684\u3002\u6240\u4ee5\u4e0a\u9762\u7684\u622a\u56fe\u5e95\u90e8\u8fd8\u6709\u4e00\u4e9b\u6307\u4ee4 <code>get_pc_thunk.ax<\/code> \u8981\u6267\u884c\u3002<\/p>\n\n\n\n<p>\u8fd9\u4e2a\u662f\u56e0\u4e3aC\u8bed\u8a00\u4e3a\u4e86\u8c03\u8bd5\u65b9\u4fbf\uff0c \u4f1a \u5229\u7528 GOT \u8868 \u7b49\u6280\u672f\u6765\u64cd\u4f5c\u6c47\u7f16\u53d8\u91cf\u3002<\/p>\n\n\n\n<p>\u8fd9\u662f\u4e3a\u4e86\u8c03\u8bd5\u65b9\u4fbf\uff0c\u5f00\u53d1\u6548\u7387\u800c\u727a\u7272\u7684\u6027\u80fd\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p><strong>\u6269\u5c55\u77e5\u8bc6\uff1a<\/strong><\/p>\n\n\n\n<p>\u6211\u4eec\u5728\u7528 notepad++ \u6765\u67e5\u770b\u4e00\u4e0b \u4e4b\u524d\u6c47\u7f16\u4ee3\u7801 \u751f\u6210\u7684\u53ef\u6267\u884c\u6587\u4ef6\u662f\u600e\u6837\u7684\u3002<\/p>\n\n\n\n<p>\u76f4\u63a5\u641c\u7d22\uff08\u5c0f\u7aef\u5e8f\uff09\uff0c\u4e0b\u9762\u5c31\u662f\u6c47\u7f16\u4ee3\u7801\u5bf9\u5e94\u7684\u90e8\u5206\u673a\u5668\u7801<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >55 89 e5 53 51<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1021\" height=\"776\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/x86-5-0-2.png\" alt=\"\" class=\"wp-image-1089\"\/><\/figure>\n\n\n\n<p>\u4ece\u4e0a\u56fe\u53ef\u4ee5\u770b\u5230\uff0c\u5b9e\u9645\u7684\u673a\u5668\u7801\u53ea\u6709 27 \u5b57\u8282\uff0c\u5176\u4ed6\u7684\u5e94\u8be5\u90fd\u662f\u64cd\u4f5c\u7cfb\u7edf \u52a0\u7684\u4e1c\u897f\u3002<\/p>\n\n\n\n<p>\u4e4b\u524d\u8bf4\u8fc7 \u6c47\u7f16\u4ee3\u7801 \u5927\u591a\u6570\u60c5\u51b5\uff0c\u4e5f\u662f\u8fd0\u884c\u5728\u64cd\u4f5c\u7cfb\u7edf\u4e4b\u4e0a\u7684\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\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>\u672c\u6587\u4e3b\u8981\u8bb2\u89e3 \u4e24\u4e2a\u91cd\u70b9\u3002 1\uff0c\u6c47\u7f16\u4ee3\u7801 \u5bf9\u5e94\u7684 \u673a\u5668\u7801\u662f\u600e\u4e48\u6837\u7684 2\uff0c\u4e3a\u4ec0\u4e48\u7528\u6c47\u7f16\u5b9e\u73b0\u67d0\u4e9b\u529f\u80fd\u4f1a\u6bd4 C\u8bed\u8a00 \u6027 [&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-1085","post","type-post","status-publish","format-standard","hentry","category-assembly"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.2 - 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