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< div class = "date inPage" > 16 May 2025< / div > < div style = "color: gray;" >
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Read time: 3 minute(s)
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< div class = "- topic/p p" data-ofbid = "d129011e36__20250519091519" > 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" >
< li class = "- topic/li li" data-ofbid = "d129011e43__20250519091519" > 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 --->
RT-Thread Components --->
C/C++ and POSIX layer --->
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 = "d129011e54__20250519091519" > 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 --->
RT-Thread Components --->
C/C++ and POSIX layer --->
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 = "d129011e59__20250519091519" >
< p class = "- topic/p p" data-ofbid = "d129011e61__20250519091519" > 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 = "d129011e70__20250519091519" > 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 --->
C/C++ and POSIX layer --->
POSIX (Portable Operating System Interface) layer --->
[*] Enable dynamic module APIs, dlopen()/dlsym()/dlclose() etc
Select dynamic module use mem (Prsam CMA heap) --->
(X) Sys Heap
( ) Prsam CMA heap< / pre > < / div >
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< / li >
< / ol > < / div >
< 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 = "d129011e82__20250519091519" > 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
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< span class = "+ topic/keyword pr-d/apiname keyword apiname" > EXPORT_SYMBOL()< / span > 宏。< / p >
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< div class = "- topic/p p" data-ofbid = "d129011e91__20250519091519" >
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< ul class = "- topic/ul ul" id = "kernel_config__ul_iv4_sn5_fdc" data-ofbid = "kernel_config__ul_iv4_sn5_fdc" >
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< li class = "- topic/li li" data-ofbid = "d129011e95__20250519091519" > 对于一些标准的 C 库函数， < span class = "+ topic/keyword pr-d/apiname keyword apiname" > RTM_EXPORT()< / span >
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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);
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...< / pre > < / li >
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< li class = "- topic/li li" data-ofbid = "d129011e106__20250519091519" > 对于 RT-Thread API 函数，
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< 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);
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...< / pre > < / li >
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< li class = "- topic/li li" data-ofbid = "d129011e116__20250519091519" >
< div class = "- topic/p p" data-ofbid = "d129011e118__20250519091519" > 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 >
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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 >
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< div class = "- topic/p p" data-ofbid = "d129011e126__20250519091519" > 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 >
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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 >
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< p class = "- topic/p p" data-ofbid = "d129011e132__20250519091519" > 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
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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 >
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< / li >
< / ul >
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< / div >
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< / 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 >
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< p class = "- topic/p p" data-ofbid = "d129011e151__20250519091519" > 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
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< 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，
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 >
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< p class = "- topic/p p" data-ofbid = "d129011e174__20250519091519" > 执行以下操作步骤，可解决这种问题：< / p >
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< ol class = "- topic/ol ol arabic simple" id = "kernel_config__ol_jg1_tdq_wcc" data-ofbid = "kernel_config__ol_jg1_tdq_wcc" >
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< li class = "- topic/li li" data-ofbid = "d129011e179__20250519091519" >
< div class = "- topic/p p" data-ofbid = "d129011e181__20250519091519" > 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,
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toolchain/share/info/gccint.info- < strong class = "hl-keyword" > unsigned< / strong > < strong class = "hl-keyword" > long< / strong > B)< / pre > < / div >
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< / li >
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< li class = "- topic/li li" data-ofbid = "d129011e189__20250519091519" >
< div class = "- topic/p p" data-ofbid = "d129011e191__20250519091519" > 在 Kernel 中使用 < span class = "+ topic/keyword pr-d/apiname keyword apiname" > RTM_EXPORT()< / span >
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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 >
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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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