Specifications

Application Binary Interface
7
2015.04.02
NII51016
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This chapter describes the Application Binary Interface (ABI) for the Nios
®
II processor. The ABI
describes:
• How data is arranged in memory
• Behavior and structure of the stack
• Function calling conventions
Data Types
Table 7-1: Representation of Data C/C++ Types
Type Size (Bytes) Representation
char, signed char 1 two’s complement (ASCII)
unsigned char 1 binary (ASCII)
short, signed short 2 two’s complement
unsigned short 2 binary
int, signed int 4 two’s complement
unsigned int 4 binary
long, signed long 4 two’s complement
unsigned long 4 binary
float 4 IEEE
double 8 IEEE
pointer 4 binary
long long 8 two’s complement
unsigned long long 8 binary
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