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In addition to the binary application code, the executables may contain headers and tables with relocation and fixup information as well as various kinds of meta data. Among those formats listed, the ones in most common use are PE (on Microsoft Windows ), ELF (on Linux and most other versions of Unix ), Mach-O (on macOS and iOS ) and MZ (on DOS ).
For example, Windows XP Mode for Windows 7 allows users to run a 64-bit version of Windows 7 and enable old software to still work in a 32-bit virtual machine running Windows XP; VMware Workstation/VMware Fusion, Parallels Workstation, and Windows Virtual PC allow other OSes to be run on Windows, Linux, and macOS.
Contains the size of this header, normally 64 Bytes for 64-bit and 52 Bytes for 32-bit format. 0x2A: 0x36: 2: e_phentsize: Contains the size of a program header table entry. As explained below, this will typically be 0x20 (32 bit) or 0x38 (64 bit). 0x2C: 0x38: 2: e_phnum: Contains the number of entries in the program header table. 0x2E: 0x3A: 2 ...
The HX DOS Extender also uses the PE format for native DOS 32-bit binaries, and can execute some Windows binaries in DOS, thus acting like an equivalent of Wine for DOS. Mac OS X 10.5 has the ability to load and parse PE files, although it does not maintain binary compatibility with Windows.
an 11-bit binary exponent, using "excess-1023" format. Excess-1023 means the exponent appears as an unsigned binary integer from 0 to 2047; subtracting 1023 gives the actual signed value; a 52-bit significand, also an unsigned binary number, defining a fractional value with a leading implied "1" a sign bit, giving the sign of the number.
A 32-bit register can store 2 32 different values. The range of integer values that can be stored in 32 bits depends on the integer representation used. With the two most common representations, the range is 0 through 4,294,967,295 (2 32 − 1) for representation as an binary number, and −2,147,483,648 (−2 31) through 2,147,483,647 (2 31 − 1) for representation as two's complement.
10 0001 0000 1: byte → value push a byte onto the stack as an integer value: breakpoint ca 1100 1010 reserved for breakpoints in Java debuggers; should not appear in any class file caload 34 0011 0100 arrayref, index → value load a char from an array castore 55 0101 0101 arrayref, index, value → store a char into an array checkcast c0 ...
This bit numbering method has the advantage that for any unsigned number the value of the number can be calculated by using exponentiation with the bit number and a base of 2. [2] The value of an unsigned binary integer is therefore = where b i denotes the value of the bit with number i, and N denotes the number of bits in total.