Compression
UPX uses a--lzma to force it on).
Starting with version 3.91, UPX also supports 64-Bit (x64) PE files on the Decompression
UPX supports two mechanisms for decompression: an in-place technique and extraction to argv /code> will not be meaningful.
* Multiple running instances of the executable are unable to share common segments.
Unmodified UPX packing is often detected and unpacked by antivirus software
Antivirus software (abbreviated to AV software), also known as anti-malware, is a computer program used to prevent, detect, and remove malware.
Antivirus software was originally developed to detect and remove computer viruses, hence the nam ...
scanners. UPX also has a built-in feature for unpacking unmodified executables packed with itself.
Supported formats
UPX supports the following formats:
* Portable Executable
The Portable Executable (PE) format is a file format for executables, object code, DLLs and others used in 32-bit and 64-bit versions of Windows operating systems. The PE format is a data structure that encapsulates the information necessary fo ...
(PE, EXE
Exe or EXE may refer to:
* .exe, a file extension
* exe., abbreviation for executive
Places
* River Exe, in England
* Exe Estuary, in England
* Exe Island, in Exeter, England
Transportation and vehicles
* Exe (locomotive), a British locomotive
...
and DLL files):
**ARM
In human anatomy, the arm refers to the upper limb in common usage, although academically the term specifically means the upper arm between the glenohumeral joint (shoulder joint) and the elbow joint. The distal part of the upper limb between the ...
(Windows CE)
** 32-bit x86
x86 (also known as 80x86 or the 8086 family) is a family of complex instruction set computer (CISC) instruction set architectures initially developed by Intel based on the Intel 8086 microprocessor and its 8088 variant. The 8086 was introd ...
(Windows Desktop)
** 64-bit x86-64
x86-64 (also known as x64, x86_64, AMD64, and Intel 64) is a 64-bit version of the x86 instruction set, first released in 1999. It introduced two new modes of operation, 64-bit mode and compatibility mode, along with a new 4-level paging mod ...
(Windows Desktop, still experimental)
** RTM32 (DOS extender, as generated by Borland
Borland Software Corporation was a computer technology company founded in 1983 by Niels Jensen, Ole Henriksen, Mogens Glad and Philippe Kahn. Its main business was the development and sale of software development and software deployment product ...
C/Pascal
Pascal, Pascal's or PASCAL may refer to:
People and fictional characters
* Pascal (given name), including a list of people with the name
* Pascal (surname), including a list of people and fictional characters with the name
** Blaise Pascal, Fren ...
compilers)
* COFF
The Common Object File Format (COFF) is a format for executable, object code, and shared library computer files used on Unix systems. It was introduced in Unix System V, replaced the previously used a.out format, and formed the basis for exte ...
executables, used by DJGPP2
DJ's GNU Programming Platform (DJGPP) is a software development suite for Intel 80386-level and above, IBM PC compatibles which supports DOS operating systems. It is guided by DJ Delorie, who began the project in 1989. It is a port of the GNU Co ...
* a.out
a.out is a file format used in older versions of Unix-like computer operating systems for executables, object code, and, in later systems, shared libraries. This is an abbreviated form of "assembler output", the filename of the output of Ken Th ...
format, BSD
The Berkeley Software Distribution or Berkeley Standard Distribution (BSD) is a discontinued operating system based on Research Unix, developed and distributed by the Computer Systems Research Group (CSRG) at the University of California, Berk ...
i386
The Intel 386, originally released as 80386 and later renamed i386, is a 32-bit microprocessor introduced in 1985. The first versions had 275,000 transistors
** DOS
DOS is shorthand for the MS-DOS and IBM PC DOS family of operating systems.
DOS may also refer to:
Computing
* Data over signalling (DoS), multiplexing data onto a signalling channel
* Denial-of-service attack (DoS), an attack on a communicatio ...
/COM
Com or COM may refer to:
Computing
* COM (hardware interface), a serial port interface on IBM PC-compatible computers
* COM file, or .com file, short for "command", a file extension for an executable file in MS-DOS
* .com, an Internet top-level d ...
(including some binary images)
** DOS/EXE
Exe or EXE may refer to:
* .exe, a file extension
* exe., abbreviation for executive
Places
* River Exe, in England
* Exe Estuary, in England
* Exe Island, in Exeter, England
Transportation and vehicles
* Exe (locomotive), a British locomotive
...
** DOS/ SYS
* Watcom
Watcom International Corporation was a software company, which was founded in 1981 by Wes Graham and Ian McPhee. Founding staff (Fred Crigger, Jack Schueler and McPhee) were formerly members of Professor Graham's Computer Systems Group at the Uni ...
/ LE (used by DOS4G, PMODE/W, DOS32A and CauseWay
A causeway is a track, road or railway on the upper point of an embankment across "a low, or wet place, or piece of water". It can be constructed of earth, masonry, wood, or concrete. One of the earliest known wooden causeways is the Sweet Tra ...
)
* TMT/adam (as generated by the TMT Pascal compiler)
* Atari/TOS
* Linux kernel
The Linux kernel is a free and open-source, monolithic, modular, multitasking, Unix-like operating system kernel. It was originally authored in 1991 by Linus Torvalds for his i386-based PC, and it was soon adopted as the kernel for the GNU ope ...
, i386, x86-64 and ARM
* Linux Executable and Linkable Format
In computing, the Executable and Linkable FormatTool Interface Standard (TIS) Portable Formats SpecificationVersion 1.1'' (October 1993) (ELF, formerly named Extensible Linking Format), is a common standard file format for executable files, obj ...
, i386, x86-64
x86-64 (also known as x64, x86_64, AMD64, and Intel 64) is a 64-bit version of the x86 instruction set, first released in 1999. It introduced two new modes of operation, 64-bit mode and compatibility mode, along with a new 4-level paging mod ...
, ARM
In human anatomy, the arm refers to the upper limb in common usage, although academically the term specifically means the upper arm between the glenohumeral joint (shoulder joint) and the elbow joint. The distal part of the upper limb between the ...
, PowerPC
PowerPC (with the backronym Performance Optimization With Enhanced RISC – Performance Computing, sometimes abbreviated as PPC) is a reduced instruction set computer (RISC) instruction set architecture (ISA) created by the 1991 Apple Inc., App ...
, MIPS
* PlayStation 1
The (abbreviated as PS, commonly known as the PS1/PS one or its codename PSX) is a home video game console developed and marketed by Sony Computer Entertainment. It was released in Japan on 3 December 1994, in North America on 9 September 1995 ...
/EXE (MIPS R3000)
* Darwin Mach-O
Mach-O, short for Mach object file format, is a file format for executables, object code, shared libraries, dynamically-loaded code, and core dumps. It was developed to replace the a.out format.
Mach-O is used by some systems based on the M ...
, ppc32, i386, and x86-64
UPX does not currently support PE files containing CIL code intended to run on the .NET Framework
The .NET Framework (pronounced as "''dot net"'') is a proprietary software framework developed by Microsoft that runs primarily on Microsoft Windows. It was the predominant implementation of the Common Language Infrastructure (CLI) until bein ...
.
Notes
References
External links
*
{{compression software implementations
Free data compression software
Free software programmed in C++
EXE packers
1998 software
Assembly language software