Linux Standard Base Specification for the IA32 Architecture 1.1.0
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Data Representation

LSB-conforming applications shall use the data representation as defined in Chapter 3 of the System V Application Binary Interface - Intel386 Architecture Processor Supplement.

Byte Ordering

Fundamental Types

In addition to the fundamental types specified in Chapter 3 of the System V Application Binary Interface - Intel386 Architecture, a 64 bit data type is defined here.

Table 2-1. Scalar Types

TypeCsizeofAlignment (bytes)IntelI386 Architecture
Integrallong long84signed double word
signed long long
unsigned long long84unsigned double word

Aggregates and Unions

Bit Fields

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