gdb问题设置硬件观察点/如何设置软件观察点

问题描述

前面的问题解释说，在x86上，被监视对象的大小受调试寄存器的限制。 如预期，我可以看一个双变量。但我不能观看双数据成员，例如

 观看pObject-> dPrice 
  

产生

 硬件观察点1：pObject - > dPrice 
  

但是当您尝试继续执行时，表示

 无法插入硬件断点：$ b​​ $ b您可能请求了太多的硬件断点/观察点。 
  

即使这只是断点/观察点。

我很好奇为什么会这样，但更重要的是有办法吗？根据gdb docs它可以使用软件观察点，如果它不能使用硬件。

解决方案

在这种情况下，它不会尝试使用软件观察点 - 可以：

从：

set can-use-hw-watchpoints

    设置是否使用硬件观察点。

show can-use-hw-watchpoints

    显示当前使用硬件观察点的模式。

An earlier question explained that on x86 the size of objects being watched is limited by debug registers. here. As expected, I can "watch" a double variable. But I can't watch a double datamember, eg

watch pObject->dPrice

produces

Hardware watchpoint 1: pObject->dPrice

But when you try to continue execution, it says

Could not insert hardware breakpoints:
You may have requested too many hardware breakpoints/watchpoints.

even though this is the only breakpoint/watchpoint.

I'm curious why this is so, but more importantly is there a way around it? According to gdb docs it may use software watchpoints if it can't use hardware. In this case it makes no attempt to use a software watchpoint -- is there a way to force it to do so?

解决方案

Yes you can:

From 5.1.2 Setting Watchpoints:

set can-use-hw-watchpoints

    Set whether or not to use hardware watchpoints.

show can-use-hw-watchpoints

    Show the current mode of using hardware watchpoints.

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