INTRODUCTION TO THE DEBUGGERS in Software

Encoder QR Code in Software INTRODUCTION TO THE DEBUGGERS
2 INTRODUCTION TO THE DEBUGGERS
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The p command is functionally similar to that of the trace command for all statements except for the function calls The p command treats the entire function call as a single statement and executes it in its entirety
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0:000> p 02sample!KBTest::Fibonacci_stdcall+0x4b: 004017ab e8b0ffffff call 02sample!KBTest::Fibonacci_stdcall (00401760) 0:000> p
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2
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Introduction to the Debuggers
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02sample!KBTest::Fibonacci_stdcall+0x50: 004017b0 03c6 add eax,esi
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When debugging a complex piece of code, we want only to validate the variable s value at some important point in the code execution, such as the place where the code calls a new function At this point, both the parameters to the function can be checked, as well as the return values from the function after it is executed pc is the command that executes the entirety of the code until the next subroutine call It can be combined nicely with p when only the function results are important or with t when more careful tracing is required With the debugger stopped right before the function call, all parameters passed to the function can be inspected If necessary, the parameters can be changed using the e or r commands; this is usually done to simulate various failures
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0:000>t 02sample!wmain: 01001c90 8bff 0:000> pc 02sample!wmain+0xe: 01001c9e e81d000000 0:000> p 02sample!wmain+0x13: 01001ca3 8d4dfc
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02sample!AppInfo::AppInfo (01001cc0)
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Continuing Code Execution
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When the debugger waits in command mode, the debugger target does not change its state at all To resume the execution of the debugger target, the user must explicitly tell the debugger to continue the execution When the current break has been caused by an exception and the debugger cleared the exception condition, the continuation should be done using the form of the command telling the system that the exception has been handled A very good description of these details can be found in 3 g is the basic command used to release the debugger target, and it works equally well in user mode and kernel mode debugger By far the most used command, in the simplest form, it just continues, unconditionally, the execution of the debugger target The second most used form, g <address>, is used to continue the debugger target execution until a specific address is hit, where the execution stops in the debugger The command is equivalent with setting a breakpoint, executing the debug target until the breakpoint is hit, and removing the breakpoint
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Basic Debugger Tasks
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gu is another common form used to continue the execution of the debugger target until the current function finishes and returns to the caller The command is aware of the current stack pointer, so it can be used to return from a recursive function call In the user mode debugger, all forms of the execute command can be directed to a specific thread instead of the entire process When the thread identifier is specified, all threads but the specified one are frozen until the debugger target stops again in the debugger
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0:000> k3 ChildEBP RetAddr 0006fc64 00401792 02sample!KBTest::Fibonacci_stdcall+0x50 0006fc78 00401792 02sample!KBTest::Fibonacci_stdcall+0x42 0006fc8c 00401792 02sample!KBTest::Fibonacci_stdcall+0x42 0:000> * Execute until returning from the current function 0:000> gu eax=00000001 ebx=7ffd9000 ecx=00000001 edx=00000000 esi=00000000 edi=00000000 eip=00401792 esp=0006fc70 ebp=0006fc78 iopl=0 nv up ei pl nz na po nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00000202 02sample!KBTest::Fibonacci_stdcall+0x42: 00401792 8bf0 mov esi,eax 0:000> * Unassemble the function to find a good spot to execute to 0:000> u l4 02sample!KBTest::Fibonacci_stdcall+0x42: 00401792 8bf0 mov esi,eax 00401794 8b5508 mov edx,dword ptr [ebp+8] 00401797 83ea02 sub edx,2 0040179a 52 push edx 0:000> * Execute until 0040179a address is reached 0:000> g 0040179a eax=00000001 ebx=7ffd9000 ecx=00000001 edx=00000001 esi=00000001 edi=00000000 eip=0040179a esp=0006fc70 ebp=0006fc78 iopl=0 nv up ei pl nz na po nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00000202 02sample!KBTest::Fibonacci_stdcall+0x4a: 0040179a 52 push edx 0:000> * Execute until returning from the current function, freezing all threads but 0 0:000> ~0 gu eax=00000002 ebx=7ffd9000 ecx=00000001 edx=00000001 esi=00000000 edi=00000000 eip=00401792 esp=0006fc84 ebp=0006fc8c iopl=0 nv up ei pl nz na po nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00000202 02sample!KBTest::Fibonacci_stdcall+0x42: 00401792 8bf0 mov esi,eax
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