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  • CONFIG_DEBUG_USER【转】

    转自:https://blog.csdn.net/adaptiver/article/details/12778621

    关于CONFIG_DEBUG_USER
    把menuconfig中查到的 CONFIG_DEBUG_USER 信息copy在下面:
      | CONFIG_DEBUG_USER:
      |
      | When a user program crashes due to an exception, the kernel can
      | print a brief message explaining what the problem was. This is
      | sometimes helpful for debugging but serves no purpose on a
      | production system. Most people should say N here.
      |
      | In addition, you need to pass user_debug=N on the kernel command
      | line to enable this feature.  N consists of the sum of:
      |
      |     1 - undefined instruction events
      |     2 - system calls
      |     4 - invalid data aborts
      |     8 - SIGSEGV faults
      |    16 - SIGBUS faults
      |
      | Symbol: DEBUG_USER [=n]
      | Type  : boolean
      | Prompt: Verbose user fault messages
      |   Defined at arch/arm/Kconfig.debug:49
      |   Location:
      |     -> Kernel hacking

    要试用该功能:

    首先在config文件中添加该选项,然后在 kernel 的cmdline中添加 user_debug=1 或者 user_debug=31
    类似:
    console=ttyS2 quiet user_debug=31
    setenv bootargs console=ttySAC0,115200 user_debug=1 saveenv

    user_debug的值可根据情况选定,下面这几个宏与上面的粗体部分可对照一下,可得知各个bit使能之后能得到的信息。

    #define UDBG_UNDEFINED (1 << 0)
    #define UDBG_SYSCALL (1 << 1)
    #define UDBG_BADABORT (1 << 2)
    #define UDBG_SEGV (1 << 3)
    #define UDBG_BUS (1 << 4)

    有一篇文章就这一点而言有参考意义:

    http://blog.chinaunix.net/uid-25756789-id-3420210.html

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  • 原文地址:https://www.cnblogs.com/sky-heaven/p/9339864.html
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