3 ms·
"you might see the flag as 0 and eventually it would switch to 1" Sorry, noob question: Were there easy avaiable tools (in the debugger), to monitor a variable
by lukan 3y ago
"you might see the flag as 0 and eventually it would switch to 1"
Sorry, noob question: Were there easy avaiable tools (in the debugger), to monitor a variable like this and have the debugger stop exactly when it was going to change, so you could see which thread and function did it and why?
- DaiPlusPlus 3y agoYes, x86 kernel-mode debuggers support hardware breakpoints that cause the attached debugger (running on a separate machine, of course) to break not just when a specific address/instruction is executed, but also whenever some address is written to (and also possibly read-from too, I think?)
- jasomill 3y agoYes: many debuggers support setting watchpoints[1] that break on writes to a particular memory location. Depending on the platform and the debugger, these can be implemented using CPU architecture-specific debugging features, or in software, by single-step program execution and checking watched addresses for changes after each step. [1] https://sourceware.org/gdb/current/onlinedocs/gdb.html/Set-Watchpoints.html https://sourceware.org/gdb/current/onlinedocs/gdb.html/Set-W...