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support independent interrupts management
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The context_gcc.S file was incorrectly marked as cortex-m4 in both the
doxygen comment and .cpu directive, while the IAR and KEIL versions
correctly specify cortex-m33. This file uses ARMv8-M specific features
(PSPLIM register, TrustZone support) that are not available in Cortex-M4.
Changes:
- Update doxygen group from cortex-m4 to cortex-m33
- Change .cpu directive from cortex-m4 to cortex-m33
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* [libcpu] rv64: discard rt_current_thread
* arm: using rt_thread_self to fetch current TCB
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- 为RT-Thread设计MPU抽象层，支持ARMV7-M，ARMV8-M架构，让用户使用MPU检测栈溢出等内存问题，实现线程内存隔离
- 在components/mp目录下提供通用的API，libcpu目录下提供各处理器架构的具体实现
- 在STM32U575 NUCLEO， STM32H75 NUCLEO开发板测试通过
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rt_hw_context_switch_to (#5748)
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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 <[email protected]>
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