![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250605190301-6841e9e56bb1c.png\")
<\/p>\n\u76ee\u5f55<\/p>\n
\u54c8\u4f5b\u7ed3\u6784<\/p>\n
arm\u6307\u4ee4\u683c\u5f0f<\/p>\n
\u00a0\u6709\u7b26\u53f7\u6570\u7684\u6ea2\u51fa（8bit)\u200b<\/p>\n
\u65e0\u7b26\u53f7\u6570\u7684\u8fdb\u4f4d\/\u501f\u4f4d<\/p>\n
CPSR（\u5f53\u524d\u7a0b\u5e8f\u72b6\u6001\u5bc4\u5b58\u5668）<\/p>\n
ARM\u6a21\u5f0f<\/p>\n
arm\u5f02\u5e38\u7c7b\u578b<\/p>\n
\u00a0ARMv7\u67b6\u6784\u5f02\u5e38\u5411\u91cf\u8868<\/p>\n
\u00a0arm\u5f02\u5e38\u7684\u5904\u7406\u6d41\u7a0b<\/p>\n
arm\u5bc4\u5b58\u5668<\/p>\n
\u5806\u6808\u6307\u9488\u5bc4\u5b58\u5668<\/p>\n
arm\u6a21\u5f0f\u5207\u6362\u6d41\u7a0b<\/p>\n
LDR\u6307\u4ee4\u3001STR\u6307\u4ee4<\/p>\n
\u6307\u4ee4\u6d41\u6c34\u7ebf（\u4e09\u7ea7\u6d41\u6c34\u7ebf+\u51af\u8bfa\u4f9d\u66fc\u4f53\u7cfb）<\/p>\n
\u4e09\u7ea7\u6d41\u6c34\u7ebf<\/p>\n
\u5e26\u6709\u8bbf\u95ee\u5b58\u50a8\u5668\u6307\u4ee4\u6d41\u6c34\u7ebf（LDR\/STR)<\/p>\n
\u5206\u652f\u6d41\u6c34\u7ebf<\/p>\n
B\/BL<\/p>\n
arm\u7acb\u5373\u6570\u7f16\u7801\u89c4\u5219<\/p>\n
arm\u6761\u4ef6\u7801\u8868<\/p>\n
arm\u79fb\u4f4d\u64cd\u4f5c<\/p>\n
\u903b\u8f91\u79fb\u4f4dvs\u7b97\u672f\u79fb\u4f4d<\/p>\n
\u903b\u8f91\u79fb\u4f4d\u7684\u672c\u8d28—-\u65e0\u8bba\u5de6\u79fb\u8fd8\u662f\u53f3\u79fb，\u7a7a\u51fa\u7684\u4f4d\u5747\u8865\u96f6，\u4e0d\u4fdd\u7559\u7b26\u53f7\u4fe1\u606f<\/p>\n
LDM\/STM\u6307\u4ee4<\/p>\n
\u00a0LDM\u6307\u4ee4：<\/p>\n
\u8f6f\u4e2d\u65ad\u6307\u4ee4<\/p>\n
\u8f6f\u4e2d\u65ad\u7684\u672c\u8d28<\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 arm Linux\u7cfb\u7edf\u8c03\u7528\u5b9e\u73b0<\/p>\n
\u00a0STM\u6307\u4ee4<\/p>\n
arm\u5bfb\u5740\u65b9\u5f0f<\/p>\n
\u591a\u5bc4\u5b58\u5668\u5bfb\u5740<\/p>\n
\u5806\u6808\u5bfb\u5740<\/p>\n
\u00a0\u6807\u7b7elabel<\/p>\n
\u5168\u5c40\u6807\u7b7e<\/p>\n
\u00a0\u5b9a\u4e49\u5168\u5c40\u51fd\u6570<\/p>\n
\u00a0\u5b9a\u4e49\u5168\u5c40\u53d8\u91cf<\/p>\n
\u00a0\u4f7f\u7528\u573a\u666f<\/p>\n
\u5c40\u90e8\u6807\u7b7e<\/p>\n
\u5f15\u7528\u65b9\u5f0f<\/p>\n
\u5f15\u7528\u89c4\u5219<\/p>\n
\u4f7f\u7528\u573a\u666f<\/p>\n
\u5f31\u6807\u7b7e<\/p>\n
\u00a0\u5f31\u6807\u7b7e\u7684\u8986\u76d6\u539f\u5219<\/p>\n
\u4f7f\u7528\u573a\u666f<\/p>\n
\u9759\u6001\u6807\u7b7e<\/p>\n
\u9759\u6001\u6807\u7b7e\u7684\u5b9a\u4e49<\/p>\n
\u00a0\u4f7f\u7528\u573a\u666f<\/p>\n
\u4f2a\u6307\u4ee4<\/p>\n
NOP\u4f2a\u6307\u4ee4<\/p>\n
ADR\u4f2a\u6307\u4ee4<\/p>\n
ADRL\u4f2a\u6307\u4ee4<\/p>\n
LDR\u4f2a\u6307\u4ee4<\/p>\n
LDR\u4f2a\u6307\u4ee4\u7684\u4e24\u79cd\u5f62\u5f0f<\/p>\n
arm\u4f2a\u64cd\u4f5c<\/p>\n
\u6c47\u7f16\u8c03\u7528c\u7a0b\u5e8f<\/p>\n
\u00a0c\u8c03\u7528\u6c47\u7f16\u7a0b\u5e8f<\/p>\n
\u5185\u8054\u6c47\u7f16<\/p>\n
\u9971\u548c\u7b97\u672f\u8fd0\u7b97：<\/p>\n
\u534f\u5904\u7406\u5668<\/p>\n
\u5185\u8054\u6c47\u7f16\u7684\u57fa\u672c\u8bed\u6cd5<\/p>\n
\u00a0 <\/p>\n
\u6838\u5fc3\u7279\u5f81\u662f\u5c06\u6307\u4ee4\u5b58\u50a8\u548c\u6570\u636e\u5b58\u50a8\u5b8c\u5168\u5206\u79bb，\u5404\u81ea\u4f7f\u7528\u72ec\u7acb\u7684\u5b58\u50a8\u5668\u548c\u603b\u7ebf<\/p>\n
<\/p>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250605190301-6841e9e58dcab.png\")
<\/p>\n
arm\u6307\u4ee4\u96c6\u91c7\u7528\u56fa\u5b9a\u957f\u5ea632\u4f4d\u7684\u6307\u4ee4\u683c\u5f0f<\/p>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250605190301-6841e9e5ce2a0.png\")
<\/p>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250605190301-6841e9e5f1f7b.png\")
<\/p>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250605190302-6841e9e6225ec.png\")
<\/h4>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250605190302-6841e9e64c148.png\")
<\/h4>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250605190302-6841e9e66f8dc.png\")
<\/p>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250605190302-6841e9e6c0fc1.png\")
<\/p>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250605190302-6841e9e6e83d2.png\")
<\/p>\n
\u7528\u6237\u6a21\u5f0f<\/span>，\u7528\u6237\u7a0b\u5e8f\u7684\u5de5\u4f5c\u6a21\u5f0f，\u7528\u6237\u6a21\u5f0f\u6ca1\u6709\u6743\u9650\u53bb\u64cd\u4f5c\u5176\u5b83\u786c\u4ef6\u8d44\u6e90，\u53ea\u80fd\u6267\u884c\u5904\u7406\u81ea\u5df1\u7684 \u6570\u636e；<\/p>\n<\/li>\n \u7cfb\u7edf\u6a21\u5f0f<\/span>，\u9996\u5148\u7528\u6237\u6a21\u5f0f\u4e0e\u7cfb\u7edf\u6a21\u5f0f\u5171\u7528\u540c\u4e00\u5957\u5bc4\u5b58\u5668，\u7cfb\u7edf\u6a21\u5f0f\u4e3a\u7279\u6743\u6a21\u5f0f，\u7cfb\u7edf\u6a21\u5f0f\u53ef\u4ee5\u76f4\u63a5\u8bbf\u95ee\u786c\u4ef6\u8d44\u6e90<\/p>\n<\/li>\n svc\u6a21\u5f0f<\/span>，\u4e3b\u8981\u7528\u4e8e\u5b8c\u6210\u7cfb\u7edf\u521d\u59cb\u5316\u7684\u5de5\u4f5c，cpu\u4e0a\u7535\u4e4b\u540e\u9ed8\u8ba4\u7684\u5de5\u4f5c\u6a21\u5f0f，\u5f53\u8c03\u7528swi\/svc，cpu\u5904\u4e8esvc\u6a21\u5f0f；<\/p>\n<\/li>\n \u4e2d\u6b62\u6a21\u5f0f<\/span>，\u5f53\u7528\u6237\u8bbf\u95ee\u975e\u6cd5\u5185\u5b58\u5730\u5740\u6216\u8005\u8bbf\u95ee\u67d0\u4e00\u5757\u4e0d\u5177\u6709\u8bfb\u5199\u6743\u9650\u7684\u5185\u5b58\u5730\u5740\u65f6\u5904\u4e8e\u6b64\u5de5\u4f5c\u6a21\u5f0f；<\/p>\n<\/li>\n Fiq\u6a21\u5f0f <\/span>（\u5feb\u901f\u4e2d\u65ad\u6a21\u5f0f），\u7528\u6765\u5904 \u7406\u5bf9\u65f6\u95f4\u8981\u6c42\u6bd4\u8f83\u7d27\u6025\u7684\u4e2d\u65ad\u8bf7\u6c42，\u4e3b\u8981\u7528\u4e8e\u9ad8\u901f\u6570\u636e\u4f20\u8f93\u53ca\u901a\u9053\u5904\u7406\u4e2d；<\/p>\n<\/li>\n IRQ\u6a21\u5f0f<\/span>（\u666e\u901a\u4e2d\u65ad\u6a21\u5f0f），\u7528\u4e8e\u5904\u7406\u4e00\u822c\u7684\u4e2d\u65ad\u8bf7\u6c42，\u901a\u5e38\u5728\u786c\u4ef6\u4ea7\u751f\u4e2d\u65ad\u4fe1\u53f7\u4e4b\u540e\u81ea\u52a8\u8fdb\u5165IRQ\u6a21\u5f0f；<\/p>\n<\/li>\n<\/ul>\n arm\u5904\u7406\u5668\u5728\u4efb\u4f55\u5de5\u4f5c\u6a21\u5f0f\u4e0b\u5171\u7528\u4e00\u4e2aPC\u5bc4\u5b58\u5668（\u7a0b\u5e8f\u8ba1\u6570\u5bc4\u5b58\u5668）\u4e0eCPSR\u5bc4\u5b58\u5668（\u5f53\u524d\u7a0b\u5e8f\u72b6\u6001\u5bc4\u5b58\u5668）\u3002<\/p>\n \u00a0\u6808\u6309\u7167\u6808\u7684\u751f\u957f\u65b9\u5411（\u9012\u589e\u3001\u9012\u51cf）\u4e0e\u6570\u636e\u7684\u5b58\u50a8\u65b9\u5f0f（\u6ee1\u6808\u3001\u7a7a\u6808）\u5206\u4e3a\u56db\u79cd\u7c7b\u578b<\/p>\n 1. \u6ee1\u9012\u589e\u6808 2. \u6ee1\u9012\u51cf\u6808 3. \u7a7a\u9012\u589e\u6808 4. \u7a7a\u9012\u51cf\u6808<\/p>\n \u6808\u9876\u6307\u9488（sp): \u59cb\u7ec8\u6307\u5411\u5f53\u524d\u6808\u7684\u6808\u9876，\u5373\u6700\u540e\u4e00\u4e2a\u5165\u6808\u5143\u7d20\u7684\u5730\u5740（\u6ee1\u6808）\u6216\u8005 \u4e0b\u4e00\u4e2a\u53ef\u7528\u7a7a\u95f4\u7684\u5730\u5740（\u7a7a\u6808）<\/p>\n \u9012\u589e\u6808：\u6808\u9876\u5411\u9ad8\u5730\u5740\u65b9\u5411\u589e\u957f<\/p>\n \u9012\u51cf\u6808：\u6808\u9876\u5411\u4f4e\u5730\u5740\u65b9\u5411\u589e\u957f<\/p>\n push\u64cd\u4f5c\u65f6\u5904\u7406\u5668\u5148\u51cf\u5c0fSP\u503c，\u7136\u540e\u5c06\u6307\u5b9a\u5bc4\u5b58\u5668\u5b58\u50a8\u5230SP\u5bc4\u5b58\u5668\u6307\u5411\u7684\u5b58\u50a8\u5668\u5730\u5740<\/span><\/p>\n \u5728ARM\u4e2d，\u5f53\u53d1\u751f\u5f02\u5e38\u65f6，\u5904\u7406\u5668\u4f1a\u81ea\u52a8\u5207\u6362\u5230\u5bf9\u5e94\u7684\u5f02\u5e38\u6a21\u5f0f，\u6bcf\u79cd\u5f02\u5e38\u6a21\u5f0f\u90fd\u6709\u81ea\u5df1\u72ec\u7acb\u7684\u7269\u7406\u5bc4\u5b58\u5668，R13(SP：\u5806\u6808\u5bc4\u5b58\u5668)\u3001R14(LR:\u94fe\u63a5\u5bc4\u5b58\u5668）SPSR（\u5907\u4efd\u7a0b\u5e8f\u72b6\u6001\u5bc4\u5b58\u5668）\u3002<\/span><\/p>\n \u5f53\u4ece\u7528\u6237\u6a21\u5f0f\u8fdb\u5165IRQ\u6a21\u5f0f\u65f6，\u4fdd\u5b58\u9700\u8981\u4fdd\u62a4\u7684\u5bc4\u5b58\u5668\u5230IRQ\u6a21\u5f0f\u7684\u5806\u6808，\u6b65\u9aa4\u5982\u4e0b：<\/p>\n \u4fdd\u5b58\u8fd4\u56de\u5730\u5740\u5230LR_irq（LR_irq = \u5f53\u524dPC + 4）\u3002<\/span><\/p>\n<\/li>\n \u4fdd\u5b58\u5f53\u524dCPSR\u5230SPSR_irq\u3002<\/span><\/p>\n<\/li>\n IRQ_Handler: ; 2. \u5904\u7406\u4e2d\u65ad（\u5982\u8bfb\u53d6\u5b9a\u65f6\u5668\u72b6\u6001） ; 3. \u6062\u590d\u5bc4\u5b58\u5668\u5e76\u8fd4\u56de\u7528\u6237\u6a21\u5f0f \u00a0<\/p>\n LDR\u6307\u4ee4（Load Register）\u662f\u7528\u4e8e\u4ece\u5185\u5b58\u4e2d\u52a0\u8f7d\u6570\u636e\u5230\u5bc4\u5b58\u5668\u7684\u6838\u5fc3\u6307\u4ee4<\/p>\n \u00a0STR\u6307\u4ee4（Store Register）\u7528\u4e8e\u5c06\u5bc4\u5b58\u5668\u4e2d\u7684\u503c\u5b58\u50a8\u5230\u5185\u5b58\u4e2d<\/p>\n \u51af\u8bfa\u4f9d\u66fc\u4f53\u7cfb：\u6570\u636e\u603b\u7ebf\u53ea\u6709\u4e00\u6839，\u53d6\u6307\u4ee4\u4e0e\u53d6\u6570\u636e\u91c7\u7528\u540c\u4e00\u6839\u6570\u636e\u7ebf<\/span><\/p>\n LDR\u6307\u4ee4<\/p>\n \u00a0 \u00a0 \u00a0 step1：\u8bbf\u95ee\u5185\u5b58\u2014\u2014\u53d6\u6570\u636e\u2014\u2014\u6570\u636e\u603b\u7ebf\u88ab\u5360\u7528\u2014\u2014AND\u6307\u4ee4\u88ab\u5ef6\u65f6(stall)<\/p>\n \u00a0 \u00a0 \u00a0 step2：\u6570\u636e\u5199\u56de\u5bc4\u5b58\u5668\u2014\u2014\u5199\u6570\u636e\u2014\u2014\u6570\u636e\u603b\u7ebf\u88ab\u5360\u7528\u2014\u2014\u5176\u4ed6\u6307\u4ee4\u88ab\u5ef6\u65f6<\/p>\n BL（Branch with Link）\u6307\u4ee4\u6838\u5fc3\u529f\u80fd\u662f\u8df3\u8f6c\u5230\u76ee\u6807\u5730\u5740\u6267\u884c\u5b50\u7a0b\u5e8f<\/span>，\u540c\u65f6\u5c06\u8fd4\u56de\u5730\u5740<\/span>（\u4e0b\u4e00\u6761\u6307\u4ee4\u5730\u5740<\/span>）\u4fdd\u5b58\u5230\u94fe\u63a5\u5bc4\u5b58\u5668LR<\/span>;<\/p>\n B（Branch）\u6307\u4ee4\u7684\u6838\u5fc3\u529f\u80fd\u662f\u6539\u53d8\u7a0b\u5e8f\u6267\u884c\u6d41\u7a0b，\u5e38\u7528\u4e8e\u5faa\u73af\u63a7\u5236（for\/while)\u3001\u6761\u4ef6\u5206\u652f(if-else) \u548c\u4ee3\u7801\u5757\u8df3\u8f6c<\/p>\n BL <label> #label\u4e2d\u5b58\u50a8\u7684\u662f\u76ee\u6807\u5730\u5740<\/p>\n \u8df3\u8f6c\u5730\u5740\u8ba1\u7b97\u6d41\u7a0b：<\/span><\/p>\n \u00a0eg: ARM\u7acb\u5373\u6570\u91c7\u7528 "8 \u4f4d\u6570\u503c<\/span> + 4 \u4f4d\u5faa\u73af\u53f3\u79fb<\/span>（Rotate Right)"\u7684\u7ec4\u5408\u7f16\u7801：<\/p>\n \u5047\u8bbe\u6709\u7b26\u53f7\u6570A\u548cB，\u6bd4\u8f83A \u2265 B\u7b49\u4ef7\u4e8e\u5224\u65adA – B \u2265 0<\/p>\n \u8bbeS = A – B，\u5219<\/p>\n A \u2265 B\u7684\u5145\u8981\u6761\u4ef6\u662f：N \u4e0e V \u72b6\u6001\u4e00\u81f4（N\u22bbV=0）<\/p>\n \u7b97\u672f\u79fb\u4f4d\u7684\u672c\u8d28—-\u53f3\u79fb\u65f6\u4fdd\u7559\u7b26\u53f7\u4f4d（\u9ad8\u4f4d\u586b\u5145\u539f\u7b26\u53f7\u4f4d），\u5de6\u79fb\u4e0e\u903b\u8f91\u5de6\u79fb\u4e00\u81f4<\/span><\/p>\n \u4e3b\u52a8\u89e6\u53d1：\u4e0e\u786c\u4ef6\u4e2d\u65ad（\u7531\u5916\u90e8\u8bbe\u5907\u89e6\u53d1，\u5982\u952e\u76d8\u3001\u65f6\u949f）\u4e0d\u540c，\u8f6f\u4e2d\u65ad\u662f\u7a0b\u5e8f\u901a\u8fc7\u663e\u5f0f\u6267\u884c\u6307\u4ee4\u4e3b\u52a8\u53d1\u8d77\u7684\u3002<\/p>\n<\/li>\n \u7279\u6743\u7ea7\u5207\u6362：\u5728\u4fdd\u62a4\u6a21\u5f0f\u4e0b，\u8f6f\u4e2d\u65ad\u901a\u5e38\u7528\u4e8e\u4ece\u7528\u6237\u6001<\/span>（\u4f4e\u7279\u6743\u7ea7）\u5207\u6362\u5230\u5185\u6838\u6001<\/span>（\u9ad8\u7279\u6743\u7ea7），\u4ee5\u4fbf\u6267\u884c\u53d7\u4fdd\u62a4\u7684\u64cd\u4f5c（\u5982\u8bbf\u95ee\u786c\u4ef6\u3001\u7ba1\u7406\u5185\u5b58）\u3002<\/p>\n<\/li>\n<\/ul>\n \u7cfb\u7edf\u8c03\u7528\u53f7<\/span>\u662f\u64cd\u4f5c\u7cfb\u7edf\u5185\u6838<\/span>\u4e3a\u6bcf\u4e2a\u7cfb\u7edf\u8c03\u7528\u5206\u914d\u7684\u552f\u4e00\u7f16\u53f7！<\/span><\/p>\n \u6307\u4ee4\u5982\u4f55\u8868\u8fbe \u201c\u53bb\u54ea\u91cc\u627e\u6570\u636e<\/span>\u201d \u6216 \u201c\u628a\u7ed3\u679c\u5b58\u5230\u54ea\u91cc\u201d<\/span>？\u8fd9\u9700\u8981\u4e00\u5957\u89c4\u5219 \u2014\u2014 \u5373\u5bfb\u5740\u6a21\u5f0f<\/p>\n \u5bfb\u5740\u662f<\/span>\u786e\u5b9a\u6307\u4ee4\u4e2d\u64cd\u4f5c\u6570\u4f4d\u7f6e<\/span>\u7684\u8fc7\u7a0b\u3002\u64cd\u4f5c\u6570\u53ef\u4ee5\u5b58\u50a8\u5728：<\/span><\/p>\n 1. \u5bc4\u5b58\u5668（\u5982 R0~R15）<\/span><\/p>\n 2. \u5185\u5b58（\u5982\u53d8\u91cf\u3001\u6570\u7ec4）<\/span><\/p>\n 3. \u7acb\u5373\u6570（\u6307\u4ee4\u4e2d\u76f4\u63a5\u7ed9\u51fa\u7684\u5e38\u6570）<\/span><\/p>\n push\/pop<\/span><\/p>\n \u6807\u7b7e\u662f\u4e00\u4e2a\u7b26\u53f7\u5316\u7684\u5730\u5740\u6807\u8bb0，\u6307\u5411\u4ee3\u7801\u6216\u6570\u636e\u5728\u5185\u5b58\u4e2d\u7684\u4f4d\u7f6e；<\/p>\n \u5728 ARM Linux \u6c47\u7f16\u5f00\u53d1\u4e2d，\u6807\u7b7e（Label）\u7684\u5206\u7c7b\u4e3b\u8981\u57fa\u4e8e\u5176 \u4f5c\u7528\u57df<\/span>（\u53ef\u89c1\u6027\u8303\u56f4）\u3001\u94fe\u63a5\u5c5e\u6027<\/span>（\u7b26\u53f7\u5728\u94fe\u63a5\u9636\u6bb5\u7684\u884c\u4e3a）\u4ee5\u53ca \u7b26\u53f7\u5f3a\u5f31\u6027<\/span>（\u662f\u5426\u5141\u8bb8\u88ab\u8986\u76d6）\u53ef\u4ee5\u5206\u4e3a \u5168\u5c40\u6807\u7b7e<\/span>\u3001\u5c40\u90e8\u6807\u7b7e<\/span>\u3001\u9759\u6001\u6807\u7b7e<\/span>\u3001\u5f31\u6807\u7b7e<\/span>\u3002<\/p>\n \u4f7f\u7528 .global \u4f2a\u6307\u4ee4\u58f0\u660e\u6807\u7b7e\u4e3a\u5168\u5c40，\u5141\u8bb8\u5176\u4ed6\u6587\u4ef6\u5f15\u7528<\/p>\n .global \u6807\u7b7e\u540d @ \u58f0\u660e\u4e3a\u5168\u5c40\u6807\u7b7e @\u5b9a\u4e49\u4e00\u4e2a\u5168\u5c40\u51fd\u6570 add_two .data \u5728 ARM \u6c47\u7f16\u4e2d，\u5c40\u90e8\u6807\u7b7e<\/span>\u662f\u4ec5\u5728 \u5f53\u524d\u4ee3\u7801\u5757\u6216\u4f5c\u7528\u57df\u5185\u6709\u6548<\/span> \u7684\u4e34\u65f6\u7b26\u53f7，\u7528\u4e8e\u7b80\u5316\u5faa\u73af\u3001\u6761\u4ef6\u5206\u652f\u7b49\u63a7\u5236\u903b\u8f91，\u907f\u514d\u547d\u540d\u51b2\u7a81\u3002\u5c40\u90e8\u6807\u7b7e\u901a\u8fc7 \u6570\u5b57 + \u5192\u53f7 <\/span>\u5b9a\u4e49，\u5e76\u901a\u8fc7 b（backward）\u548c f（forward） \u5f15\u7528；<\/p>\n \u5b9a\u4e49\u683c\u5f0f：\u4ee5\u6570\u5b57\u5f00\u5934，\u540e\u8ddf\u5192\u53f7（\u5982 1:\u30012:）；<\/p>\n<\/li>\n \u4f5c\u7528\u57df：\u4ec5\u5728\u5f53\u524d\u4ee3\u7801\u5757（\u5982\u51fd\u6570\u6216\u5faa\u73af\u4f53）\u5185\u6709\u6548；<\/p>\n<\/li>\n<\/ul>\n 1b：\u5411\u540e\u8df3\u8f6c（Backward），\u6307\u5411 \u6700\u8fd1\u7684\u524d\u4e00\u4e2a 1: \u6807\u7b7e\u3002<\/p>\n<\/li>\n 1f：\u5411\u524d\u8df3\u8f6c（Forward），\u6307\u5411 \u6700\u8fd1\u7684\u540e\u4e00\u4e2a 1: \u6807\u7b7e<\/p>\n<\/li>\n<\/ul>\n \u5c31\u8fd1\u539f\u5219：\u6839\u636e b\/f \u65b9\u5411，\u5bfb\u627e\u6700\u8fd1\u7684\u540c\u540d\u6807\u7b7e\u3002<\/p>\n<\/li>\n \u53ef\u91cd\u590d\u4f7f\u7528：\u540c\u4e00\u4ee3\u7801\u5757\u5185\u53ef\u591a\u6b21\u5b9a\u4e49\u540c\u540d\u5c40\u90e8\u6807\u7b7e（\u5982 1:）\u3002<\/p>\n<\/li>\n<\/ul>\n .text _start: loop_start: @ \u5168\u5c40\u6807\u7b7e（\u53ef\u9009） 1: @ \u5c40\u90e8\u6807\u7b7e1（\u5faa\u73af\u51fa\u53e3） \u5728 ARM \u6c47\u7f16\u4e2d，\u5f31\u6807\u7b7e（Weak Label）<\/span> \u662f\u4e00\u79cd\u5141\u8bb8 \u540c\u540d\u7b26\u53f7\u8986\u76d6<\/span> \u7684\u6807\u7b7e\u7c7b\u578b\u3002\u5b83\u5e38\u7528\u4e8e\u5b9a\u4e49 \u9ed8\u8ba4\u5b9e\u73b0 \u6216 \u53ef\u9009\u529f\u80fd，\u5f53\u94fe\u63a5\u5668\u53d1\u73b0\u540c\u540d\u7684 \u5f3a\u6807\u7b7e（Strong Label） \u65f6，\u4f1a\u4f18\u5148\u4f7f\u7528\u5f3a\u6807\u7b7e\u7684\u5b9a\u4e49，\u5f31\u6807\u7b7e\u7684\u5b9a\u4e49\u5219\u88ab\u5ffd\u7565\u3002<\/p>\n .weak \u6807\u7b7e\u540d @ \u58f0\u660e\u4e3a\u5f31\u6807\u7b7e \u5f3a\u6807\u7b7e\u4f18\u5148<\/span>：\u82e5\u5b58\u5728\u540c\u540d\u7684\u5f3a\u6807\u7b7e（\u901a\u8fc7 .global \u58f0\u660e），\u94fe\u63a5\u65f6\u4f7f\u7528\u5f3a\u6807\u7b7e\u7684\u5b9a\u4e49\u3002<\/p>\n<\/li>\n \u65e0\u5f3a\u6807\u7b7e\u65f6\u751f\u6548<\/span>：\u82e5\u672a\u5b9a\u4e49\u5f3a\u6807\u7b7e，\u94fe\u63a5\u5668\u4f7f\u7528\u5f31\u6807\u7b7e\u7684\u5b9e\u73b0\u3002<\/p>\n<\/li>\n \u5141\u8bb8\u591a\u4e2a\u5f31\u6807\u7b7e：<\/span>\u82e5\u591a\u4e2a\u5f31\u6807\u7b7e\u540c\u540d，\u94fe\u63a5\u5668\u968f\u673a\u9009\u62e9\u5176\u4e00（\u901a\u5e38\u62a5\u8b66\u544a）\u3002<\/p>\n<\/li>\n<\/ul>\n \u9759\u6001\u6807\u7b7e\u662f\u4ec5\u5728 \u5f53\u524d\u6c47\u7f16\u6587\u4ef6\u5185\u6709\u6548 \u7684\u7b26\u53f7，\u4e0d\u53ef\u88ab\u5176\u4ed6\u6587\u4ef6\u5f15\u7528\u3002\u5b83\u7684\u6838\u5fc3\u4f5c\u7528\u662f \u5c01\u88c5\u5185\u90e8\u5b9e\u73b0，\u907f\u514d\u547d\u540d\u51b2\u7a81，\u63d0\u5347\u4ee3\u7801\u6a21\u5757\u5316；<\/p>\n \u5728\u6587\u4ef6 utils.s \u4e2d\u5b9a\u4e49\u9759\u6001\u51fd\u6570 internal_add，\u4ec5\u5728\u6587\u4ef6\u5185\u90e8\u8c03\u7528；\u5728 main.s \u4e2d\u5c1d\u8bd5\u8c03\u7528\u8be5\u51fd\u6570\u5c06\u5931\u8d25\u3002<\/p>\n NOP(No Operation)\u4f2a\u6307\u4ee4 \u6838\u5fc3\u529f\u80fd 1. \u5b9e\u73b0\u5ef6\u65f6 2.\u00a0\u5bf9\u9f50\u6307\u4ee4\u5730\u5740<\/p>\n ADR\u4f2a\u6307\u4ee4 \u53ef\u4ee5\u83b7\u53d6\u7a0b\u5e8f\u7684\u8fd0\u884c\u5730\u5740，\u800c\u4e0d\u662f\u94fe\u63a5\u5730\u5740<\/span><\/p>\n \u6ce8\u610f： \u6807\u7b7e\u5730\u5740\u5fc5\u987b\u4e0eADRL\u6307\u4ee4\u4f4d\u4e8e\u540c\u4e00\u4ee3\u7801\u6bb5\u5185<\/span><\/p>\n LDR\u4f2a\u6307\u4ee4（Pseudo-Instruction）\u4e3b\u8981\u529f\u80fd\u5982\u4e0b：<\/span><\/p>\n \u00a0\u6ce8\u610f：#offset\u662f\u5f53\u524d\u6307\u4ee4\u5730\u5740<\/span>（PC）\u5230 \u6587\u5b57\u6c60\u4e2d\u76ee\u6807\u6570\u636e\u5730\u5740 <\/span>\u7684\u504f\u79fb\u91cf<\/p>\n \u6c47\u7f16\u8c03\u7528c\u7a0b\u5e8f\u6d41\u7a0b @start.s\u6587\u4ef6 1. \u5b9a\u4e49\u6c47\u7f16\u51fd\u6570my_add, \u6ce8\u610f\u4f20\u9012\u7684\u53c2\u6570\u3001\u8fd4\u56de\u503c\u6ee1\u8db3ATCPS\u89c4\u5219 \u5185\u8054\u6c47\u7f16\u5141\u8bb8\u5728\u9ad8\u7ea7\u8bed\u8a00（\u5982C\/C++）\u4e2d\u76f4\u63a5\u5d4c\u5165\u6c47\u7f16\u4ee3\u7801，\u5185\u8054\u6c47\u7f16\u7684\u5e94\u7528\u573a\u666f：<\/p>\n \u9971\u548c\u7b97\u672f\u8fd0\u7b97\u662f\u4e00\u79cd\u5728\u6570\u503c\u8fd0\u7b97\u4e2d\u9632\u6b62\u6ea2\u51fa\u7684\u5904\u7406\u65b9\u5f0f\u3002\u5f53\u8fd0\u7b97\u7ed3\u679c\u8d85\u51fa\u6570\u636e\u7c7b\u578b\u7684\u8868\u793a\u8303\u56f4\u65f6，\u7ed3\u679c\u4f1a\u88ab\u201c\u9971\u548c\u201d\u5230\u8be5\u6570\u636e\u7c7b\u578b\u80fd\u8868\u793a\u7684\u6700\u5927\u503c\u6216\u6700\u5c0f\u503c；<\/p>\n ARM\u67b6\u6784\u901a\u8fc7\u652f\u6301\u534f\u5904\u7406\u5668\u6765\u6269\u5c55\u5904\u7406\u5668\u7684\u529f\u80fd\u3002ARM\u67b6\u6784\u7684\u5904\u7406\u5668\u652f\u6301\u6700\u591a16\u4e2a\u534f\u5904\u7406\u5668，\u901a\u5e38\u79f0\u4e3aCP0~CP15；<\/p>\n CP15,\u63d0\u4f9b\u7cfb\u7edf\u63a7\u5236\u529f\u80fd，\u4e3b\u8981\u7528\u4e8e\u914d\u7f6eMMU\u3001TLB\u548cCache\u3001\u5f02\u5e38\u5411\u91cf\u8868\u7684\u5730\u5740\u8bbe\u7f6e；<\/p>\n \/\/__asm__\u544a\u77e5\u7f16\u8bd1\u5668\u4e0d\u7528\u68c0\u67e5\u540e\u9762\u7684\u5185\u5bb9，\u53ea\u9700\u8981\u4ea4\u7ed9\u6c47\u7f16\u5668\u8fdb\u884c\u5904\u7406 1. volatile \u5173\u952e\u5b57\u7981\u6b62\u7f16\u8bd1\u5668\u4f18\u5316\u5185\u8054\u6c47\u7f16\u4ee3\u7801；<\/p>\n 2. "asm code"\u4e3b\u8981\u7528\u4e8e\u586b\u5199\u6c47\u7f16\u4ee3\u7801，\u7528\\\\n\\\\t\u5206\u9694\u591a\u884c\u6c47\u7f16\u6307\u4ee4；<\/p>\n __asm__ volatile ( 3. \u8f93\u51fa\u64cd\u4f5c\u6570\u5217\u8868(asm->c\/c++)\u7528\u4e8e\u6307\u5b9a\u6c47\u7f16\u4ee3\u7801\u6267\u884c\u540e\u9700\u8981\u4f20\u9012\u56de C\/C++ \u53d8\u91cf\u7684\u7ed3\u679c，\u901a\u5e38\u53ea\u80fd\u4e3a\u53d8\u91cf；<\/p>\n __asm__ volatile ( \u6bcf\u4e2a\u8f93\u51fa\u64cd\u4f5c\u6570\u7684\u683c\u5f0f\u4e3a "\u7ea6\u675f"(\u53d8\u91cf)<\/span>，\u591a\u4e2a\u64cd\u4f5c\u6570\u7528\u9017\u53f7\u5206\u9694，\u5176\u4e2d\u7ea6\u675f\u7531\u4e24\u90e8\u5206\u6784\u6210，\u4e00\u90e8\u5206\u4e3a<\/span>\u65b9\u5411\u4fee\u9970\u7b26<\/span>（+，=，&），\u65b9\u5411\u4fee\u9970\u7b26\u7528\u4e8e\u6307\u5b9a\u8be5\u64cd\u4f5c\u6570\u662f\u8f93\u5165\u8fd8\u662f\u8f93\u51fa，\u8f93\u51fa\u64cd\u4f5c\u6570\u5fc5\u987b\u5305\u542b =（\u8868\u793a\u64cd\u4f5c\u6570\u4ec5\u7528\u4e8e\u8f93\u51fa\u7b49\u4ef7\u4e8e\u53ea\u5199<\/span>）\u6216\u00a0 +（\u8868\u793a\u64cd\u4f5c\u6570\u65e2\u662f\u8f93\u5165\u53c8\u662f\u8f93\u51fa\u7b49\u4ef7\u4e8e\u53ef\u8bfb\u53ef\u5199）<\/span>，& \u5fc5\u987b\u901a\u8fc7 +& \u6216\u8005 =& \u8fdb\u884c\u4f7f\u7528<\/span>，\u53e6\u4e00\u90e8\u5206\u4e3a\u7ea6\u675f\u7b26（r，m）<\/span>，\u7ea6\u675f\u7b26\u7528\u4e8e\u6307\u5b9a\u64cd\u4f5c\u6570\u7684\u5b58\u653e\u4f4d\u7f6e，\u5176\u4e2d r<\/span> \u7ea6\u675f（\u5bc4\u5b58\u5668\u7ea6\u675f）<\/span>\u8981\u6c42\u64cd\u4f5c\u6570\u5b58\u50a8\u5728\u901a\u7528\u5bc4\u5b58\u5668\u4e2d，m \u7ea6\u675f（\u5185\u5b58\u7ea6\u675f）<\/span>\u8981\u6c42\u64cd\u4f5c\u6570\u76f4\u63a5\u5b58\u50a8\u5728\u5185\u5b58\u5730\u5740\u4e2d，\u907f\u514d\u901a\u8fc7\u5bc4\u5b58\u5668\u4e2d\u8f6c；<\/p>\n =r :\u00a0\u8f93\u51fa\u5230\u901a\u7528\u5bc4\u5b58\u5668<\/span>，\u64cd\u4f5c\u6570\u4ec5\u7528\u4e8e\u5199\u5165<\/p>\n __asm__ volatile ( \u7ed3\u679c\u5199\u5165\u5bc4\u5b58\u5668 r0，\u518d\u4f20\u9012\u7ed9 result；<\/p>\n 4. \u8f93\u5165\u64cd\u4f5c\u6570\u5217\u8868(c\/c++ -> asm)\u7528\u4e8ec\/c++\u7a0b\u5e8f\u5411\u6c47\u7f16\u4ee3\u7801\u4f20\u9012\u6570\u636e，\u8f93\u5165\u64cd\u4f5c\u6570\u7684\u503c\u5728\u6c47\u7f16\u4ee3\u7801\u4e2d\u4e0d\u5e94\u88ab\u4fee\u6539，\u53ea\u80fd\u8bfb\u53d6，\u56e0\u6b64\u8f93\u5165\u64cd\u4f5c\u6570\u65e0\u9700\u65b9\u5411\u4fee\u9970\u7b26，\u5e38\u7528\u7ea6\u675f\u7b26 r（<\/span>\u53d8\u91cf\u503c\u5b58\u5165\u901a\u7528\u5bc4\u5b58\u5668）m（<\/span>\u53d8\u91cf\u76f4\u63a5\u901a\u8fc7\u5185\u5b58\u5730\u5740\u8bbf\u95ee）i（<\/span>\u7acb\u5373\u6570（\u6574\u6570\u5e38\u91cf）），<\/span>\u6b64\u5916<\/span>\u7528\u4e8e\u5b9a\u4e49\u8f93\u5165\u7684\u53c2\u6570，\u53ef\u4ee5\u662f\u53d8\u91cf\u4e5f\u53ef\u4ee5\u662f\u7acb\u5373\u6570；<\/p>\n int a = 10, b = 20; 5. \u7834\u574f\u5217\u8868\u544a\u77e5\u7f16\u8bd1\u5668\u54ea\u4e9b\u5bc4\u5b58\u5668\u6216\u8d44\u6e90\u88ab\u9690\u5f0f\u4fee\u6539，\u5e38\u89c1\u503c\u5982\u4e0b：<\/p>\n "cc"：\u6761\u4ef6\u7801\u5bc4\u5b58\u5668（CPSR）；<\/p>\n<\/li>\n "memory"：\u8868\u793a\u5185\u5b58\u88ab\u4fee\u6539（\u5f3a\u5236\u5237\u65b0\u5185\u5b58\u7f13\u5b58）；<\/p>\n<\/li>\n "r0", "r1"：\u6307\u5b9a\u88ab\u7834\u574f\u7684\u5bc4\u5b58\u5668；<\/p>\n<\/li>\n<\/ul>\n __asm__ volatile ( \u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb2.8k\u6b21\uff0c\u70b9\u8d5e18\u6b21\uff0c\u6536\u85cf47\u6b21\u3002ARM\u67b6\u6784<\/p>\n","protected":false},"author":2,"featured_media":41971,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[751,58,3870,188],"topic":[],"class_list":["post-41991","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-arm","tag-linux","tag-3870","tag-188"],"yoast_head":"\narm\u5f02\u5e38\u7c7b\u578b<\/h3>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250605190303-6841e9e72751c.png\")
<\/p>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250605190303-6841e9e748615.png\")
<\/p>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250605190303-6841e9e7550d7.png\")
<\/p>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250605190303-6841e9e76b95d.png\")
<\/p>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250605190303-6841e9e781365.png\")
<\/p>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250605190303-6841e9e796b2d.png\")
<\/p>\n\u00a0ARMv7\u67b6\u6784\u5f02\u5e38\u5411\u91cf\u8868<\/h4>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250605190303-6841e9e7ad66a.png\")
<\/p>\n\u00a0arm\u5f02\u5e38\u7684\u5904\u7406\u6d41\u7a0b<\/h4>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250605190303-6841e9e7e22a4.png\")
<\/p>\narm\u5bc4\u5b58\u5668<\/h3>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250605190304-6841e9e83ddb6.png\")
<\/p>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250605190304-6841e9e899a1f.png\")
<\/p>\n\u5806\u6808\u6307\u9488\u5bc4\u5b58\u5668<\/h3>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250605190304-6841e9e8a486c.png\")
<\/p>\n![\"\"](\"2025-06-0600r2mzqnwvm.png\")
\u00a0POP\u64cd\u4f5c\u65f6\u5904\u7406\u5668\u5148\u5c06SP\u6307\u5411\u7684\u5b58\u50a8\u5668\u5730\u5740\u5b58\u50a8\u5230\u6307\u5b9a\u5bc4\u5b58\u5668\u4e2d，\u7136\u540e\u5c06SP\u5bc4\u5b58\u5668\u503c\u589e\u52a0\u3002<\/span><\/p>\narm\u6a21\u5f0f\u5207\u6362\u6d41\u7a0b<\/h3>\n
\n ; 1. \u4fdd\u5b58\u7528\u6237\u6a21\u5f0f\u7684\u5bc4\u5b58\u5668（R0-R12, LR_irq\u4fdd\u5b58\u7684\u662f\u8fd4\u56de\u5730\u5740）
\n STMFD SP!, {R0-R12, LR} ; \u4f7f\u7528SP_irq\u538b\u6808（SP_irq -= 56\u5b57\u8282）<\/p>\n
\n BL Handle_Timer_Interrupt<\/p>\n
\n LDMFD SP!, {R0-R12, LR} ; \u4eceSP_irq\u5f39\u6808（SP_irq += 56\u5b57\u8282）
\n SUBS PC, LR, #4 ; \u8fd4\u56de\u5230\u7528\u6237\u6a21\u5f0f\u7684\u4e0b\u4e00\u6761\u6307\u4ee4（\u6062\u590dCPSR） <\/p>\nLDR\u6307\u4ee4\u3001STR\u6307\u4ee4<\/h3>\n
![\"\"](\"2025-06-06aqr0c03m5qq.png\")
<\/p>\n![\"\"](\"2025-06-06hcscs3prja5.png\")
<\/p>\n\u6307\u4ee4\u6d41\u6c34\u7ebf（\u4e09\u7ea7\u6d41\u6c34\u7ebf+\u51af\u8bfa\u4f9d\u66fc\u4f53\u7cfb）<\/h3>\n
\u4e09\u7ea7\u6d41\u6c34\u7ebf<\/h4>\n
![\"\"](\"2025-06-064kyu1zykud0.png\")
<\/p>\n\u5e26\u6709\u8bbf\u95ee\u5b58\u50a8\u5668\u6307\u4ee4\u6d41\u6c34\u7ebf（LDR\/STR)<\/h4>\n
![\"\"](\"2025-06-06uefufor2asz.png\")
<\/p>\n![\"\"](\"2025-06-06ffjzpzzimdj.png\")
<\/p>\n\u5206\u652f\u6d41\u6c34\u7ebf<\/h4>\n
![\"\"](\"2025-06-06lcp3xurazfu.png\")
<\/p>\n![\"\"](\"2025-06-06tzgwi3lqqqx.png\")
<\/p>\nB\/BL<\/h4>\n
![\"\"](\"2025-06-061byvo4dhgkf.png\")
<\/p>\n![\"\"](\"2025-06-06vq0xjdzbdai.png\")
<\/p>\n![\"\"](\"2025-06-06qra4vapknns.png\")
<\/p>\n![\"\"](\"2025-06-061xkrmqr5ymi.png\")
<\/p>\n![\"\"](\"2025-06-06qmnvpkuwknm.png\")
<\/p>\n![\"\"](\"2025-06-06ynxeofs1uj3.png\")
<\/p>\narm\u7acb\u5373\u6570\u7f16\u7801\u89c4\u5219<\/h3>\n
![\"\"](\"2025-06-061u1cf3mlhq4.png\")
<\/p>\narm\u6761\u4ef6\u7801\u8868<\/h3>\n
\n
![\"\"](\"2025-06-06e2tn34ume4j.png\")
<\/p>\narm\u79fb\u4f4d\u64cd\u4f5c<\/h3>\n
![\"\"](\"2025-06-06je0stiwdvxq.png\")
<\/p>\n![\"\"](\"2025-06-06xr0sg5ou3b2.png\")
<\/p>\n![\"\"](\"2025-06-06lnocvycm3ct.png\")
<\/p>\n![\"\"](\"2025-06-061rousx41n0a.png\")
<\/p>\n![\"\"](\"2025-06-06fo2pfqqlvva.png\")
<\/p>\n\u903b\u8f91\u79fb\u4f4dvs\u7b97\u672f\u79fb\u4f4d<\/h4>\n
\u903b\u8f91\u79fb\u4f4d\u7684\u672c\u8d28—-\u65e0\u8bba\u5de6\u79fb\u8fd8\u662f\u53f3\u79fb，\u7a7a\u51fa\u7684\u4f4d\u5747\u8865\u96f6，\u4e0d\u4fdd\u7559\u7b26\u53f7\u4fe1\u606f<\/span><\/h5>\n
LDM\/STM\u6307\u4ee4<\/h3>\n
\u00a0LDM\u6307\u4ee4：<\/h4>\n
![\"\"](\"2025-06-0654mgdx10usi.png\")
<\/p>\n![\"\"](\"2025-06-065pjbjs3qxx3.png\")
<\/p>\n![\"\"](\"2025-06-06vqboeu3e1td.png\")
<\/p>\n\u8f6f\u4e2d\u65ad\u6307\u4ee4<\/h4>\n
\u8f6f\u4e2d\u65ad\u7684\u672c\u8d28<\/h4>\n
\n
![\"\"](\"2025-06-06glj3unfhaaa.png\")
<\/p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 arm Linux\u7cfb\u7edf\u8c03\u7528\u5b9e\u73b0<\/h3>\n
![\"\"](\"2025-06-06k55402al3h0.png\")
<\/p>\n![\"\"](\"2025-06-06g0hv1m1zdml.png\")
<\/p>\n![\"\"](\"2025-06-06fldjknpsaqf.png\")
<\/p>\n![\"\"](\"2025-06-06y0as4rti2yu.png\")
<\/p>\n![\"\"](\"2025-06-06acy0ktcqeag.png\")
<\/p>\n![\"\"](\"2025-06-06pcnj3iymaqh.png\")
<\/p>\n![\"\"](\"2025-06-06yyy3zrtrqiw.png\")
<\/p>\n![\"\"](\"2025-06-06r0sd13wdv5v.png\")
<\/p>\n\u00a0STM\u6307\u4ee4<\/h4>\n
![\"\"](\"2025-06-062lqvojsme55.png\")
<\/p>\n![\"\"](\"2025-06-06a4c5pmcbx2d.png\")
<\/p>\n![\"\"](\"2025-06-062js40u3xb2n.png\")
<\/p>\n![\"\"](\"2025-06-060udie3c0haf.png\")
<\/p>\n![\"\"](\"2025-06-06mfsl3tjgtm1.png\")
<\/p>\narm\u5bfb\u5740\u65b9\u5f0f<\/h3>\n
![\"\"](\"2025-06-06mv0hkv42rko.png\")
<\/p>\n![\"\"](\"2025-06-06a1omzomyfkr.png\")
<\/p>\n![\"\"](\"2025-06-06m25rxbsch5r.png\")
![\"\"](\"2025-06-06w4hlmqc4mbg.png\")
<\/p>\n\u591a\u5bc4\u5b58\u5668\u5bfb\u5740<\/h4>\n
![\"\"](\"2025-06-06nepw5alhwou.png\")
<\/p>\n![\"\"](\"2025-06-06kdbwtsicp0m.png\")
![\"\"](\"2025-06-06gv3y0ixy54p.png\")
<\/p>\n![\"\"](\"2025-06-06fyqxibxxqbs.png\")
<\/p>\n![\"\"](\"2025-06-06o0rg3uqf55l.png\")
\u00a0![\"\"](\"2025-06-06x2qkgvrvomn.png\")
<\/p>\n![\"\"](\"2025-06-06g5m5powe0na.png\")
<\/p>\n\u5806\u6808\u5bfb\u5740<\/h3>\n
![\"\"](\"2025-06-065pxmhdxei23.png\")
<\/p>\n\u00a0\u6807\u7b7elabel<\/h3>\n
![\"\"](\"2025-06-06ijiz4s2bmqe.png\")
<\/p>\n\u5168\u5c40\u6807\u7b7e<\/h4>\n
\n\u6807\u7b7e\u540d: @ \u6807\u7b7e\u5b9a\u4e49
\n \u6c47\u7f16\u6307\u4ee4 <\/p>\n\u00a0\u5b9a\u4e49\u5168\u5c40\u51fd\u6570<\/h5>\n
\n.global add_two @ \u58f0\u660e\u4e3a\u5168\u5c40
\nadd_two:
\n ADD R0, R0, R1 @ R0 = R0 + R1
\n BX LR @ \u8fd4\u56de <\/p>\n\u00a0\u5b9a\u4e49\u5168\u5c40\u53d8\u91cf<\/h5>\n
\n.global g_counter @ \u58f0\u660e\u5168\u5c40\u53d8\u91cf
\ng_counter:
\n .word 0x0 @ \u521d\u59cb\u503c\u4e3a0 <\/p>\n\u00a0\u4f7f\u7528\u573a\u666f<\/h5>\n
![\"\"](\"2025-06-06ekjfxcxv1dc.png\")
<\/p>\n![\"\"](\"2025-06-064wzkrdmkqtt.png\")
<\/p>\n![\"\"](\"2025-06-06ocfsy35jnow.png\")
<\/p>\n\u5c40\u90e8\u6807\u7b7e<\/h4>\n
\n
\u5f15\u7528\u65b9\u5f0f<\/h5>\n
\n
\u5f15\u7528\u89c4\u5219<\/h5>\n
\n
\u4f7f\u7528\u573a\u666f<\/h5>\n
\n.global _start<\/p>\n
\n MOV R0, #5 @ \u521d\u59cb\u5316 R0 = 5<\/p>\n
\n1: @ \u5c40\u90e8\u6807\u7b7e1（\u5faa\u73af\u5165\u53e3）
\n SUBS R0, R0, #1 @ R0 = R0 – 1，\u66f4\u65b0\u6807\u5fd7\u4f4d
\n BEQ 1f @ \u82e5 R0 == 0，\u5411\u524d\u8df3\u8f6c\u5230\u5c40\u90e8\u6807\u7b7e1（\u5faa\u73af\u51fa\u53e3）
\n B 1b @ \u5426\u5219，\u5411\u540e\u8df3\u8f6c\u5230\u5c40\u90e8\u6807\u7b7e1（\u7ee7\u7eed\u5faa\u73af）<\/p>\n
\n MOV R7, #1 @ \u9000\u51fa\u7cfb\u7edf\u8c03\u7528\u53f7
\n SVC #0 @ \u89e6\u53d1\u7cfb\u7edf\u8c03\u7528 <\/p>\n\u5f31\u6807\u7b7e<\/h4>\n
\n\u6807\u7b7e\u540d: @ \u6807\u7b7e\u5b9a\u4e49
\n \u6c47\u7f16\u6307\u4ee4 <\/p>\n\u00a0\u5f31\u6807\u7b7e\u7684\u8986\u76d6\u539f\u5219<\/h5>\n
\n
\u4f7f\u7528\u573a\u666f<\/h5>\n
![\"\"](\"2025-06-06iiemabd3flr.png\")
<\/p>\n![\"\"](\"2025-06-06o12iofq3zfm.png\")
<\/p>\n![\"\"](\"2025-06-06pkszezorols.png\")
<\/p>\n\u9759\u6001\u6807\u7b7e<\/h4>\n
\u9759\u6001\u6807\u7b7e\u7684\u5b9a\u4e49<\/h5>\n
![\"\"](\"2025-06-06vym5qqt2cq2.png\")
<\/p>\n\u00a0\u4f7f\u7528\u573a\u666f<\/h5>\n
![\"\"](\"2025-06-06co1lp5cvxh2.png\")
<\/p>\n![\"\"](\"2025-06-06u0eilj1acce.png\")
<\/p>\n![\"\"](\"2025-06-06w1ib1slmdw1.png\")
<\/p>\n\u4f2a\u6307\u4ee4<\/h3>\n
NOP\u4f2a\u6307\u4ee4<\/h4>\n
![\"\"](\"2025-06-06ksgyhik2t3k.png\")
<\/p>\nADR\u4f2a\u6307\u4ee4<\/h4>\n
![\"\"](\"2025-06-06gksv04rvtp1.png\")
<\/p>\n![\"\"](\"2025-06-06sprl2bdku5d.png\")
<\/h4>\nADRL\u4f2a\u6307\u4ee4<\/h4>\n
![\"\"](\"2025-06-06rlpony50vet.png\")
<\/p>\nLDR\u4f2a\u6307\u4ee4<\/h4>\n
\n
LDR\u4f2a\u6307\u4ee4\u7684\u4e24\u79cd\u5f62\u5f0f<\/h5>\n
![\"\"](\"2025-06-06rgvhejund2v.png\")
<\/p>\n![\"\"](\"2025-06-06h0hzyfmhugo.png\")
<\/p>\n![\"\"](\"2025-06-06ekcxei51lp0.png\")
<\/p>\n![\"\"](\"2025-06-06mpdjrscamzu.png\")
<\/p>\narm\u4f2a\u64cd\u4f5c<\/h3>\n
![\"\"](\"2025-06-06s4kr0jqto23.png\")
<\/p>\n![\"\"](\"2025-06-06u1nro0xulcs.png\")
<\/p>\n![\"\"](\"2025-06-06s4oxtkpcasl.png\")
<\/p>\n\u6c47\u7f16\u8c03\u7528c\u7a0b\u5e8f<\/h3>\n
\n@1 c\u6587\u4ef6\u4e2d\u5b9e\u73b0c\u8bed\u8a00\u51fd\u6570
\n@2 .extern\u4f2a\u64cd\u4f5c\u58f0\u660ec\u51fd\u6570 .extern my_add
\n@3.1 \u6839\u636eATPCS\u6807\u51c6,R0,R1,R2,R3\u7528\u4e8e\u4f20\u9012\u53c2\u6570，\u7531\u4e8ec\u8bed\u8a00\u51fd\u6570\u7684\u53c2\u6570\u53ef\u80fd\u8d85\u8fc74\u4e2a
\n@3.2 \u91c7\u7528\u4f2a\u6307\u4ee4ldr\u521d\u59cb\u5316\u6808\u7a7a\u95f4
\n@4 \u4f20\u9012\u53c2\u6570 mov r0,#0x01
\n@5 \u8c03\u7528\u51fd\u6570 BL\/B my_add<\/p>\n
\n .text
\n .global _start @\u5c06_start\u58f0\u660e\u4e3a\u5168\u5c40\u7684
\n .extern my_add
\n _start:
\n @\u5148\u521d\u59cb\u5316\u8981\u4f7f\u7528\u7684\u6808\u7a7a\u95f4
\n ldr sp, =0x400
\n mov r0, #10
\n mov r1, #20
\n mov r2, #30
\n mov r3, #40
\n mov r5, #50
\n push {r5}
\n bl my_add
\n loop:
\n b loop
\n .data
\n .align 4 @\u63092^4\u5b57\u8282\u5bf9\u9f50
\n.space 4096
\n .end
\n \/\/add.c\u6587\u4ef6
\n int my_add(int x, int y, int z, int m, int n)
\n {
\n return x + y + z + m + n;
\n } <\/p>\n\u00a0c\u8c03\u7528\u6c47\u7f16\u7a0b\u5e8f<\/h4>\n
\n2. \u6c47\u7f16\u6587\u4ef6\u4e2d\u901a\u8fc7.global \u628amy_add\u58f0\u660e\u4e3a\u5168\u5c40\u51fd\u6570
\n3. C\u8bed\u8a00\u4e2d\u901a\u8fc7extern\u58f0\u660e\u5916\u90e8\u51fd\u6570my_add
\n@start.s\u6587\u4ef6
\n.text
\n.global _start
\n.extern main
\n_start:
\nldr sp,=0x400
\nbl main
\n.data
\n.align 4
\n.space 4096
\nloop:
\nb loop
\n.end
\n\/\/main.c\u6587\u4ef6
\nextern int my_add(int x,int y,int z);
\nint main()
\n{
\nint ret=my_add(10,20,30);
\nreturn ret;
\n}
\n@ add.s\u6587\u4ef6
\n.arm
\n.text
\n.global my_add
\nmy_add:
\nadd r5,r0,r1
\nadd r5,r5,r2
\nmov r0,r5 @\u51fd\u6570\u7684\u8fd4\u56de\u503c\u901a\u8fc7R0\u4f20\u9012
\n.end <\/p>\n\u5185\u8054\u6c47\u7f16<\/h4>\n
\n
\u9971\u548c\u7b97\u672f\u8fd0\u7b97：<\/h5>\n
\u534f\u5904\u7406\u5668<\/h5>\n
\u5185\u8054\u6c47\u7f16\u7684\u57fa\u672c\u8bed\u6cd5<\/h5>\n
\n__asm__ volatile (
\n "asm code"
\n : \u8f93\u51fa\u64cd\u4f5c\u6570\u5217\u8868
\n : \u8f93\u5165\u64cd\u4f5c\u6570\u5217\u8868
\n : \u7834\u574f\u5217\u8868(Clobber List)
\n); <\/p>\n
\n "add r0, r1, r2\\\\n\\\\t"
\n "add r0, r0, r3\\\\n\\\\t"
\n "mov r0, r0"
\n : \/* \u8f93\u51fa\u64cd\u4f5c\u6570\u5217\u8868 *\/
\n : \/* \u8f93\u5165\u64cd\u4f5c\u6570\u5217\u8868 *\/
\n : \/* \u7834\u574f\u5217\u8868 *\/
\n); <\/p>\n
\n "mov r0, #0xFF"
\n :=r(value) \/\/ \u5c06r0\u7684\u503c\u5199\u5165value
\n : \/\/ \u8f93\u5165\u64cd\u4f5c\u6570\u5217\u8868
\n : \/\/ \u7834\u574f\u5217\u8868
\n); <\/p>\n
\n "mov r0, #42"
\n : "=r" (result)
\n); <\/p>\n
\n__asm__ volatile (
\n "add r0, %1, %2\\\\n\\\\t" \/\/ %0, %1, …, %n\u8868\u793a\u5360\u4f4d\u7b26,\u5148\u6309\u7167\u8f93\u51fa\u64cd\u4f5c\u6570\u7684\u987a\u5e8f\u8fdb\u884c\u5f15\u7528
\n \/\/\u518d\u6309\u7167\u8f93\u5165\u64cd\u4f5c\u6570\u7684\u987a\u5e8f\u8fdb\u884c\u5f15\u7528
\n "mov %0, r0" \/\/ result = r0
\n : "=r" (result) \/\/ \u8f93\u51fa\u64cd\u4f5c\u6570: result -> %0
\n : "r" (a), "r" (b) \/\/ \u8f93\u5165\u64cd\u4f5c\u6570：a -> %1, b-> %2
\n : "r0" \/\/ \u7834\u73af\u5217\u8868\u7528\u4e8e\u544a\u77e5\u7f16\u8bd1\u5668\u54ea\u4e9b\u5bc4\u5b58\u5668\u6216\u8d44\u6e90\u88ab\u9690\u5f0f\u4fee\u6539
\n); <\/p>\n\n
\n "mov r0, %1\\\\n\\\\t"
\n "str r0, [%0]"
\n :
\n : "r" (addr), "r" (value)
\n : "r0", "memory" \/\/ \u58f0\u660e\u7834\u574f r0 \u548c memory
\n); <\/p>\n<\/p>\n<\/p>\n<\/p><\/p>\n","protected":false},"excerpt":{"rendered":"