Debugger Extension in Software

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To compile the extension DLL, we must first ensure that we have added the correct environment variables to the DDK build console I typically add the following environment variable directly into my systemwide environment settings so that I do not have to worry about setting them on different consoles:
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DBGSDK_INC_PATH=C:\PROGRA~1\debugg~1\sdk\inc DBGSDK_LIB_PATH=C:\PROGRA~1\debugg~1\sdk\lib\*
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Make sure that the paths for the environment variables match the directory structure you have on your machine (as well as platform-specific subdirectories) We have to make a slight adjustment to the sources file and specify the additional paths, as well as make sure that we link to dbgenglib:
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TARGETLIBS= \ $(CRT_LIB_PATH)\MSVCRTlib \ $(SDK_LIB_PATH)\kernel32lib \ $(DBGSDK_LIB_PATH)\dbgenglib \
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11 WRITING CUSTOM DEBUGGER EXTENSIONS
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INCLUDES= $(DDK_INC_PATH); \ $(DBGSDK_INC_PATH); \
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Both of these sections might contain more libraries or include paths depending on the exact nature of the debugger extension, but for the purpose of our custom debugger extension, what is shown in this listing is sufficient After you have downloaded and installed the source code from the book s Web page, navigate to the C:\AWD\ 11\sysexts folder and type
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build /ZCc
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Upon success, the resulting sysextsdll is placed in the output directory The name of the output directory depends on which type of build environment you opened (checked or free), as well as the operating system On a WinXP checked build console window (x86), the binary is placed in
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objchk_wxp_x86\i386\sysextsdll
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We can now fire up the debugger, load the extension, and issue any of the commands we just implemented
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Writing Custom Debugger Extensions
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Summary
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As you have seen in this chapter, the notion of custom debugger extensions allows the developer to automate the debugging process by developing custom commands to enhance the debugging sessions This is truly a great tool that every system developer should have in his arsenal Although we have just scratched the surface of debugger extensions, it is well worth your time to dig into the SDK documentation and familiarize yourself with the large number of API(s) available for developing extensions The Microsoft debugger team has made a great effort to make the debug API in-depth and enable virtually unlimited possibilities with regard to extending the default debug experience
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C H A P T E R
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64-BIT DEBUGGING
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With the advent of 64-bit processors, the need to understand how these processors work and how to debug 64-bit applications is critical This chapter outlines the fundamentals of 64-bit debugging The chapter is organized as a complement to all previous chapters in which the debugger listings were captured from systems running a 32-bit version of the operating system In this chapter, we highlight the difference in behavior when the host systems have a 64-bit architecture This chapter follows the order in which the concepts are introduced in the book The chapter focuses on the 64-bit architecture introduced by AMD in 2004 Virtually all computer systems sold today are capable of running 64-bit operating systems Windows Vista is the first consumer operating system available simultaneously in 64-bit and 32-bit architectures It is not a question of whether independent software vendors will release native 64-bit applications It is just a matter of time until they release 64-bit versions of their applications This chapter reuses several samples introduced in the previous chapters The binary files targeted to Windows Vista x64 are available in the C:\AWDBIN\WinLH AMD64chk and C:\AWDBIN\WinLHAMD64fre folders If a Windows Vista x64 system is not available, we provide few memory dumps in the C:\AWDBIN\Dumps folder
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Microsoft 64-Bit Systems
Microsoft officially entered the 64-bit operating system arena with Microsoft Windows XP 64-Bit Edition that could run on systems powered by Intel Itanium processors As the name indicates, it was based on Windows XP code base, and it was released to the public in 2002, shortly after the 2001 Windows XP (32-Bit Edition) release One year later, Microsoft released Windows Server 2003 Enterprise Edition for Itanium-based systems, capable of supporting workloads required by the highest levels of reliability, availability, and scalability provided by Intel Itanium based systems In the same year, Advanced Micro Devices revealed a new 64-bit processor architecture, designed as an extension to the current x86 processor architecture The new processor s architecture has also been adopted by Intel, marketed under the Intel 595