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Questions tagged [watchpoint]

Watchpoint is a point at which program executed via a debugger stops to let the programmer peek into memory and call stack or enter step by step execution mode.

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How to trap a stack smashing from another thread?

How can I trap a stack smashing from another thread? Is it possible to set up and clear a watchpoint on the fly to watch the stack canary? Here is the code we are working with: void SomeClass::func() { fA(); fB(); } void…
Henry Hsuan-Ju Chen
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How are GDB Hardware Watchpoints working?

I am interested in how a hardware watchpoint is realized. If I watch for a uint8_t variable by watch varName (watch -> write watch) so in case any data is changed on any bit within the range of the memory location it will be detected? And how is the…
Toroid
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Data Watchpoints (DWT) on cortex-m4 to detect memory corruption

I am trying to detect memory corruption on a Cortex M4 (STM32F4) using the Data watchpoint and trace (DWT) feature of cortex-m4 boards. I am able to set the watchpoints on a variable but when I access the variable in the code the DebugMon_Handler is…
K. Sai Bharadwaj
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Is that possible to set interrupt that breaks when cpu write to many specific addresses?

I asked one of the similar question here. However, the hardware debug interrupt seems pretty limited. The ideal mechanism I would like to get is the ability to monitoring multiple variables, and once any of them changes the corresponding handler…
Shore
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Cannot set watchpoint in GDB

I am doing debugging and wanted to check the place where the value of the variable changes .For this I tried setting a watch point by saying something like watch 'structure->somefunc.getvalue()' which is not a simple variable (probably some portion…
Manish
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gdb prints long values watching a variable set with rand()

I'm using a gdb script to watch the changes of a variable using awatch: #!/bin/bash # Compile gcc -Wall -pedantic -g -o demo demo.c # Exit on compile error if [ $? -ne 0 ]; then exit fi # Overwrite the contents of trace.gdb with a title echo…
David Ranieri
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Watchpoint in cortex M4

I have a global constant array const uint32_t p[5] = {1, 2, 3, 4, 5};. I have made it read-protected by DWT->COMP1 = (uint32_t)&p; DWT->MASK1 = 6; DWT->FUNCTION1 = (1 << 11)| (1 << 0) | (1 << 2); When I access the array…
Jabeen
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Watchpoint on STM32 GPIO register

using Keil µVision on a STM32F4 I am trying to add a watchpoint to a GPIO data register, which just does not trigger. I want the watchpoint to be triggered as soon as output data gets writting into this register. Setting the watchpoint to the os…
goeck
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Setting a watchpoint on an element of an Array - Swift

Question was answered in the comments below I have an array of objects and a property of the objects keep changing. I want to set a watchpoint on that specific property in a few elements of the array. Is that possible? I have seen this answer on how…
user1807157
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gdb watchpoint except when triggered in specific locations?

I have a variable getting corrupted. I want to see where this is happening, so a watchpoint is the obvious choice, except this variable frequently gets set (in this case, processing network packets and it gets set once for each packet). I would…
abatie
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Set Read-Write watchpoint with GDB?

I'm trying to trackdown the source of incorrect runtime cpu feature reporting. I'm fairly certain its due to C++ "As-If-Broken" rule, where the language allows the compiler to take a correct program and turn it into an incorrect program. According…
jww
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Why does a GDB watchpoint stop on an irrelevant line when swapping binary tree nodes?

I am trying to swap two nodes A and B in a binary tree so that the places they are actually stored in memory change but the tree topology is not changed. I added special handling for swapping a node with its parent, but it still seems that it…
hacatu
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LLDB – Set watchpoint on instance variable of arbitrary object

For some weird reason, seguieing back to a view controller changes the userInteractionEnabled of my view's subview _settingsButton which is of UIButton type. I want to know why this happens. After setting a breakpoint in the view controller's code,…
oarfish
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How set breakpoint to class member variable in gdb

How can I set breakpoint (or watchpoint) to member variable in class for all instances of this class? I have tried set breakpoint on line in class with this member variable but this is not working.
Marcin
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Gdb on multiple instance

I have multiple instances of a particular process running on my system . At some point during the process execution, some of the internal data structures gets overwritten with invalid data. This happens on random instances at random intervals. Is…
Gviz
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