![]() One may set all four breakpoints on the same address, and they will be correctly processed.įrequently uses temporary INT3 breakpoints for internal purposes. ![]() Trace breakpoints, used to mark unprocessed or unsure branches during hit trace.Special actions when system routine is called or to restore manual Used by OllyDbg and plugins to step over the command, to perform Used to pause execution on module entry point, when executing code Manualīreakpoints are permanent but may be temporarily disabled. Protocol the call arguments or values defined by the user. They may be programmed to jump only on condition and may There are four kinds of INT3 breakpoints: Sure whether INT3 breakpoint is allowed, it will ask for confirmation. INT3 breakpoint (set on data or in the middle of the command) mayĮasily lead to the crash of debugged application. ![]() ![]() When CPU executes INT3, itĬalls OS interrupt handler which in turn reports it as an To set INT3 breakpoint, OllyDbg replaces first byte of the 80x86Ĭommand by a special code 0xCC (one-byte interrupt with a vector 3,Īlso known as a "trap to debugger"). Supports many different types of breakpoints. ![]()
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