jiladahe1997
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433e5f8147
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[bugfix] libcpu/arm/cortex-m/context_gcc: 修复thumb指令集汇编语法错误
当使用thumb指令集时,要求汇编语法中的“条件执行”要跟在IT指令后面,否则会编译不通过。
报错如下:Error: thumb conditional instruction should be in IT block -- `moveq r4,#0x01'
虽然可以通过指定"-Wa,-mimplicit-it=thumb"选项来告诉编译器识别隐式的IT指令,但是能在代码里面直接加上IT指令的话更好。
thumb指令集“条件执行”arm官网文档:
https://developer.arm.com/documentation/dui0473/m/condition-codes/conditional-execution-in-thumb-state
参考论坛帖子:
https://club.rt-thread.org/ask/question/433887.html
https://club.rt-thread.org/ask/question/4188.html
Signed-off-by: Mingrui Ren <jiladahe1997@gmail.com>
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2021-12-09 11:22:46 +08:00 |