Friday, June 10, 2016

Linkers and Loaders

Linkers and Loaders

Written for any programmer who works with compiled code, this book surveys today's hardware platforms with a tour of how code is linked and executed on IBM mainframes, Unix, and Windows. This handy title fills a valuable niche for anyone who wants to understand how programs are built and run on today's computing systems.

It's the cross-platform perspective that distinguishes this book. The author's wide-ranging perspective on IBM 370 mainframes, RISC platforms like the SUN SPARC and, of course, Microsoft Windows makes this book a commendable reference on the internals of linkers and program execution in each environment. There's also a digestible guide to the computer architecture (including registers, instruction formats, and memory addressing) for each platform. (Unix programmers will be pleased that the book has more information on non-Windows platforms than on Windows itself.) For C++ programmers, this text gives you a glimpse into the internals of such language features as macros, templates, and name mangling, and how linkers deal with them at build time.

The book closes with useful material on static libraries and dynamic linking, plus a short tour of Java and its class loader (which can resolve classes on the fly as they are downloaded over the Internet). Short exercises are provided for each chapter, making this a useful resource for both classroom and self-study on what is an often overlooked topic. --Richard Dragan

Topics covered: History of linkers and loaders, application binary interfaces (ABIs), computer architecture basics, big- and little-endian memory addresses, register and instruction formats for IBM 370, SPARC and Intel x86, paging and virtual memory, position independent code (PIC), Intel x86 segmentation, embedded architectures, object files for DOS COM and EXE files, Unix a.out, Unix ELF, IBM 360 object format, Microsoft Portable Executable (PE) format, Intel Object Module Format (OMF), storage allocation, linking details for C++, symbol management, name mangling, weak and strong references, debugging information, library formats, COFF and ELF formats, relocation, loading and overlays, bootstrap loading, shared libraries, dynamic linking for Unix ELF and Microsoft Windows DLLs, advanced linking techniques for C++, and linking in Java.

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