为什么使用__attribute__(部分)进行一些内存分配? [英] Why using __attribute__ (section) for some memory allocation?

问题描述

我有foo[NUMBYTES] __attribute__((section(".bar")));

为什么使用此属性.bar部分?因为foo []已经提供了一些内存空间.这是为了简化内存管理吗?

解决方案

对于在没有操作系统的情况下运行的裸机代码，section属性__attribute__((section(".bar")))通常用于:

• 将符号(数据或函数)放置在特殊的存储空间中，例如微控制器内置的RAM，FLASH或EEPROM.
• 将符号放在特殊地址，例如对于ARM Cortex-M处理器，将中断向量表放在FLASH的开头.
• 连续对相关符号进行分组，例如Linux内核将仅在引导时一起使用的初始化代码分组(请参见

  Why using this attribute .bar section? Because foo[] provides already some memory space. Is this for easy memory management?

  解决方案

  For bare metal code that run without an operating system, the section attribute ,__attribute__((section(".bar"))), is often used to:

  • Place symbols (data or functions) in a special memory space, such as RAM, FLASH or EEPROMs built into microcontrollers.
  • Place symbols at a special address, e.g. placing the interrupt vector table at the start of FLASH for ARM Cortex-M processors.
  • Group related symbols continuously, e.g. the Linux kernel groups initialization code that is only needed at boot together (see init section in linux/init.h) so it can free them later to save RAM.

  Search your linker script for references to the named section (.bar) and you could probably make a good guess for its use.

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