3.4 Working with watchpoints

Watchpoints can be used to stop your target when a specific memory address is accessed by your program.

Procedure

  1. To set a watchpoint:
    • If monitoring a global variable, in the Variables view, right-click on a data symbol and select Toggle Watchpoint to display the Add Watchpoint dialog.
    • If monitoring a memory address, in the Disassembly view, right-click on a memory address and select Toggle Watchpoint to display the Add Watchpoint dialog.
    Figure 3-3 Setting a data watchpoint on a data symbol
    Setting a watchpoint on a data symbol


  2. Select the required Access Type.

    You can choose:

    • ReadRead access watchpoint- To stop the target when a read access occurs.
    • WriteWrite access watchpoint- To stop the target when a write access occurs.
    • AccessRead or Write access watchpoint- To stop the target when either a read or write access occurs.
  3. If you want to enable the watchpoint when it is created, select Enable.

    Note:

    The default is enabled, but if a conditional watchpoint exists, the watchpoint is created disabled. Only one watchpoint can be enabled if a conditional watchpoint exists.
  4. Specify the width to watch at the given address, in bits. Accepted values are: 8, 16, 32, and 64 if supported by the target.

    This parameter is optional. The width defaults to:

    • 32 bits for an address.
    • The width corresponding to the type of the symbol or expression, if entered.
  5. Expand Stop Condition and in the Expression field, enter a C-style expression. For example, if your application code has a variable x, then you can specify: x == 10. If no expression is specified, then the breakpoint or watchpoint condition is deleted.
  6. Click OK to apply your selection.

    If you created a watchpoint to monitor a global variable, you can view it in the Variables view. If you created a watchpoint to monitor a memory address, you can view it in the Memory view.

    Also, you can view all watchpoints and breakpoints in your application in the Breakpoints view.

    • To delete a watchpoint, right-click a watchpoint and either select Remove Watchpoint or select Toggle Watchpoint.
    • To disable a watchpoint, right-click a watchpoint and select Disable Watchpoint to temporarily disable it. To re-enable it, select Enable Watchpoint.

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