A 32-bit assembler level analysing debugger for Microsoft Windows.

OllyDbg is a 32-bit assembler level analysing debugger for Microsoft Windows. When the source code is unavailable, OllyDbg is particularly useful as it focuses on binary code analysis.

These are the main features of this software

• Assembles commands into the shortest binary form
• Examines and modifies memory, sets breakpoints and pauses program on-the-fly
• Finds references to constant or address range
• Searches whole allocated memory
• Searches for imprecise commands and masked binary sequences
• Dynamically traces stack frames
• Shows fixups
• Traces program execution, logs arguments of known functions
• Sets conditional, logging, memory and hardware breakpoints
• Gives context-sensitive help on API functions from external help file
• Decodes calls to more than 1900 standard API and 400 C functions
• Recognizes complex code constructs, like call to jump to procedure
• Dynamically recognizes ASCII and UNICODE strings - as well in Delphi ormat!
• Full UNICODE support
• MMX, 3DNow! and SSE data types and instructions, including Athlon extensions
• Configurable disassembler, supports both MASM and IDEAL formats
• Attaches to running programs
• Debugs multithread applications
• No installation - no trash in registry or system directories
• Open architecture - many third-party plugins are available
• Saves patches between sessions, writes them back to executable file and updates fixups
• Understands debugging information in Borland® format
• Allows for user-defined labels, comments and function descriptions
• Object file scanning - locates routines from object files and libraries
• Directly loads and debugs DLLs
• Code analysis - traces registers, recognizes procedures, loops, API calls, switches, tables, constants and strings
• Intuitive user interface, no cryptical commands

· Starts from the floppy disk

Requirements for this software

• VGA display (SVGA with screen resolution at least 800x600 is strongly recommended)
• At least 2 MB free disk space
• 64 MB physical memory (128 MB recommended)
• 586/100 processor (586/300+ recommended)

· Mouse or compatible pointing device (required)