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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic concept/concept topic concept" role="article" aria-labelledby="ariaid-title1">
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<span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" href="http://aicdocco/taskstopics/sdk/app/dm_kernel_config.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">Kernel 配置</h1>
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<div class="date inPage">9 Apr 2025</div><div style="color: gray;">
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Read time: 3 minute(s)
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</div>
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<div class="- topic/body concept/conbody body conbody">
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<div class="- topic/p p" data-ofbid="d126982e36__20250409171045">如需使用 <span class="+ topic/keyword pr-d/parmname keyword parmname">Dynamic Module</span> 功能，需要在内核中打开以下配置：<ol class="- topic/ol ol" id="kernel_config__ol_exd_tfs_vcc" data-ofbid="kernel_config__ol_exd_tfs_vcc">
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<li class="- topic/li li" data-ofbid="d126982e43__20250409171045">启用 <span class="+ topic/keyword pr-d/parmname keyword parmname">POSIX</span> 文件系统和
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<span class="+ topic/keyword pr-d/parmname keyword parmname">I/O</span>：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="kernel_config__codeblock_lnm_5fs_vcc" data-ofbid="kernel_config__codeblock_lnm_5fs_vcc">Rt-Thread options --->
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RT-Thread Components --->
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C/C++ and POSIX layer --->
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POSIX (Portable Operating System Interface) layer --->
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[*] Enable POSIX file system and I/O</pre></li>
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<li class="- topic/li li" data-ofbid="d126982e54__20250409171045">启用动态模块
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API：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="kernel_config__codeblock_tb5_yfs_vcc" data-ofbid="kernel_config__codeblock_tb5_yfs_vcc">Rt-Thread options --->
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RT-Thread Components --->
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C/C++ and POSIX layer --->
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POSIX (Portable Operating System Interface) layer --->
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[*] Enable dynamic module APIs, dlopen()/dlsym()/dlclose() etc</pre></li>
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<li class="- topic/li li" data-ofbid="d126982e59__20250409171045">
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<p class="- topic/p p" data-ofbid="d126982e61__20250409171045">如有需要，可以选择 <span class="+ topic/keyword pr-d/parmname keyword parmname">dm-app</span> 动态加载时使用的内存堆
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(<span class="+ topic/keyword pr-d/parmname keyword parmname">heap</span>)，否则可跳过此步。</p>
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<div class="- topic/p p" data-ofbid="d126982e70__20250409171045">具体的可选堆会随不同平台的配置有所不同：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="kernel_config__codeblock_smy_5l5_fdc" data-ofbid="kernel_config__codeblock_smy_5l5_fdc">Rt-Thread options --->
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RT-Thread Components --->
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C/C++ and POSIX layer --->
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POSIX (Portable Operating System Interface) layer --->
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[*] Enable dynamic module APIs, dlopen()/dlsym()/dlclose() etc
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Select dynamic module use mem (Prsam CMA heap) --->
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(X) Sys Heap
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( ) Prsam CMA heap</pre></div>
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</li>
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</ol></div>
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<section class="- topic/section section" id="kernel_config__section_s1r_vl5_fdc" data-ofbid="kernel_config__section_s1r_vl5_fdc"><h2 class="- topic/title title sectiontitle">符号导出</h2>
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|
||
<p class="- topic/p p" data-ofbid="d126982e82__20250409171045">Kernel 中被 dm-app 访问到的符号需要使用 <span class="+ topic/keyword pr-d/apiname keyword apiname">RTM_EXPORT()</span> 宏来进行声明，类似 Linux 中的
|
||
<span class="+ topic/keyword pr-d/apiname keyword apiname">EXPORT_SYMBOL()</span> 宏。</p>
|
||
<div class="- topic/p p" data-ofbid="d126982e91__20250409171045">
|
||
<ul class="- topic/ul ul" id="kernel_config__ul_iv4_sn5_fdc" data-ofbid="kernel_config__ul_iv4_sn5_fdc">
|
||
<li class="- topic/li li" data-ofbid="d126982e95__20250409171045">对于一些标准的 C 库函数，dm-app 可以直接使用 Kernel 中已经定义好的 <span class="+ topic/keyword pr-d/apiname keyword apiname">RTM_EXPORT()</span>
|
||
声明，例如
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">luban-lite/kernel/rt-thread/components/libc/posix/libdl/dlsyms.c</span>。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="kernel_config__codeblock_aws_sn5_fdc" data-ofbid="kernel_config__codeblock_aws_sn5_fdc">RTM_EXPORT(strcpy);
|
||
RTM_EXPORT(strncpy);
|
||
RTM_EXPORT(strlen);
|
||
RTM_EXPORT(strcat);
|
||
RTM_EXPORT(strstr);
|
||
RTM_EXPORT(strchr);
|
||
RTM_EXPORT(strcmp);
|
||
RTM_EXPORT(strtol);
|
||
RTM_EXPORT(strtoul);
|
||
RTM_EXPORT(strncmp);
|
||
...</pre></li>
|
||
<li class="- topic/li li" data-ofbid="d126982e106__20250409171045">对于 RT-Thread API 函数，dm-app 可以直接使用 Kernel 中已经定义好的
|
||
<span class="+ topic/keyword pr-d/apiname keyword apiname">RTM_EXPORT()</span> 声明，例如
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">luban-lite/kernel/rt-thread/src/thread.c</span><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="kernel_config__codeblock_v3k_vn5_fdc" data-ofbid="kernel_config__codeblock_v3k_vn5_fdc">RTM_EXPORT(rt_thread_create);
|
||
RTM_EXPORT(rt_thread_yield);
|
||
RTM_EXPORT(rt_thread_startup);
|
||
RTM_EXPORT(rt_thread_detach);
|
||
...</pre></li>
|
||
<li class="- topic/li li" data-ofbid="d126982e116__20250409171045">
|
||
<div class="- topic/p p" data-ofbid="d126982e118__20250409171045">用户可以使用下列命令查看当前系统中使用 <span class="+ topic/keyword pr-d/apiname keyword apiname">RTM_EXPORT()</span>
|
||
声明的符号：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="kernel_config__pre_nrq_rdq_wcc" data-ofbid="kernel_config__pre_nrq_rdq_wcc">list_symbols</pre></div>
|
||
<div class="- topic/p p" data-ofbid="d126982e126__20250409171045">系统输出结果示例如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="kernel_config__codeblock_apm_kgs_vcc" data-ofbid="kernel_config__codeblock_apm_kgs_vcc">rt_critical_level=> <span class="hl-number">0x40013cc0</span>
|
||
rt_exit_critical=> <span class="hl-number">0x40014090</span>
|
||
rt_enter_critical=> <span class="hl-number">0x40013ce0</span>
|
||
rt_device_set_tx_complete=> <span class="hl-number">0x40014220</span>
|
||
rt_device_set_rx_indicate=> <span class="hl-number">0x40014200</span>
|
||
rt_device_control=> <span class="hl-number">0x400141f0</span>
|
||
rt_device_write=> <span class="hl-number">0x40014370</span>
|
||
rt_device_read=> <span class="hl-number">0x40014330</span>
|
||
rt_device_close=> <span class="hl-number">0x400143b0</span></pre><div class="- topic/note note important note_important" id="kernel_config__note_zch_xl5_fdc" data-ofbid="kernel_config__note_zch_xl5_fdc"><span class="note__title">重要：</span>
|
||
<p class="- topic/p p" data-ofbid="d126982e132__20250409171045">未使用 <span class="+ topic/keyword pr-d/apiname keyword apiname">RTM_EXPORT()</span> 声明的 Kernel 函数无法在 dm-app
|
||
中使用。如需在 dm-app 中使用自定义的 Kernel 函数，必须使用
|
||
<span class="+ topic/keyword pr-d/apiname keyword apiname">RTM_EXPORT()</span> 声明。</p>
|
||
</div></div>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</section>
|
||
<section class="- topic/section section" id="kernel_config__section_n1z_hl5_fdc" data-ofbid="kernel_config__section_n1z_hl5_fdc"><h2 class="- topic/title title sectiontitle">GCC low-level 函数的符号导出</h2>
|
||
|
||
<p class="- topic/p p" data-ofbid="d126982e151__20250409171045">在加载 dm-app 时，可能会遇到找不到某些 GCC low-level runtime library 中的函数符号的情况，如
|
||
<span class="+ topic/keyword pr-d/apiname keyword apiname">__floatdidf </span>、
|
||
<span class="+ topic/keyword pr-d/apiname keyword apiname">__umoddi3</span>、<span class="+ topic/keyword pr-d/apiname keyword apiname">__udivdi3</span>、<span class="+ topic/keyword pr-d/apiname keyword apiname">__fixdfdi</span>。这些函数是
|
||
GCC 基础运算库的一部分，用于实现 CPU 原生硬件指令无法完成的操作。例如，在 32bit 系统中实现 64bit (long long) 类型数据的除法，GCC
|
||
就会自动调用软件函数 <span class="+ topic/keyword pr-d/apiname keyword apiname">__umoddi3</span> 来实现。具体原理可以参考<a class="- topic/xref xref reference external" href="https://gcc.gnu.org/onlinedocs/gccint/Libgcc.html" target="_blank" rel="external noopener">The GCC low-level runtime
|
||
library</a>。</p>
|
||
<p class="- topic/p p" data-ofbid="d126982e174__20250409171045">执行以下操作步骤，可解决这种问题：</p>
|
||
<ol class="- topic/ol ol arabic simple" id="kernel_config__ol_jg1_tdq_wcc" data-ofbid="kernel_config__ol_jg1_tdq_wcc">
|
||
<li class="- topic/li li" data-ofbid="d126982e179__20250409171045">
|
||
<div class="- topic/p p" data-ofbid="d126982e181__20250409171045">使用以下命令，在工具链中找出函数的原型声明：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="kernel_config__codeblock_kxw_yn5_fdc" data-ofbid="kernel_config__codeblock_kxw_yn5_fdc">grep -r -A1 __umoddi3 luban-lite/toolchain/</pre><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="kernel_config__codeblock_uch_ypm_tdc" data-ofbid="kernel_config__codeblock_uch_ypm_tdc">toolchain/share/info/gccint.info: -- Runtime Function: <strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">long</strong> __umoddi3 (<strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">long</strong> A,
|
||
toolchain/share/info/gccint.info- <strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">long</strong> B)</pre></div>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d126982e189__20250409171045">
|
||
<div class="- topic/p p" data-ofbid="d126982e191__20250409171045">在 Kernel 中使用 <span class="+ topic/keyword pr-d/apiname keyword apiname">RTM_EXPORT()</span>
|
||
给函数加上符号导出声明：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="kernel_config__codeblock_bpd_zn5_fdc" data-ofbid="kernel_config__codeblock_bpd_zn5_fdc"><strong class="hl-keyword">extern</strong> <strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">long</strong> __umoddi3 (<strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">long</strong> a, <strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">long</strong> b);
|
||
RTM_EXPORT(__umoddi3);
|
||
<strong class="hl-keyword">extern</strong> <strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">long</strong> __udivdi3 (<strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">long</strong> a, <strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">long</strong> b);
|
||
RTM_EXPORT(__udivdi3);
|
||
<strong class="hl-keyword">extern</strong> <strong class="hl-keyword">double</strong> __floatdidf (<strong class="hl-keyword">long</strong> i);
|
||
RTM_EXPORT(__floatdidf);
|
||
<strong class="hl-keyword">extern</strong> <strong class="hl-keyword">long</strong> __fixdfdi (<strong class="hl-keyword">double</strong> a);
|
||
RTM_EXPORT(__fixdfdi);</pre></div>
|
||
</li>
|
||
</ol>
|
||
</section>
|
||
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|
||
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<div class=" wh_topic_toc "><div class="wh_topic_label">在本页上</div><ul><li class="section-item"><div class="section-title"><a href="#kernel_config__section_s1r_vl5_fdc" data-tocid="kernel_config__section_s1r_vl5_fdc">符号导出</a></div></li><li class="section-item"><div class="section-title"><a href="#kernel_config__section_n1z_hl5_fdc" data-tocid="kernel_config__section_n1z_hl5_fdc">GCC low-level 函数的符号导出</a></div></li></ul></div>
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