Xilinx MicroBlaze Reference Guide

MicroBlaze Processor Reference Guide 186
UG984 (v2018.2) June 21, 2018 www.xilinx.com
Chapter 4
MicroBlaze Application Binary Interface
Introduction
This chapter describes MicroBlaze™ Application Binary Interface (ABI), which is important
for developing software in assembly language for the soft processor. The MicroBlaze GNU
compiler follows the conventions described in this document. Any code written by assembly
programmers should also follow the same conventions to be compatible with the compiler
generated code. Interrupt and Exception handling is also explained briefly.
Data Types
The data types used by MicroBlaze assembly programs are shown in the following table.
Data types such as data8, data16, and data32 are used in place of the usual byte, half-word,
and word.register.
Table 4-1: Data Types in MicroBlaze Assembly Programs
MicroBlaze data types
(for assembly programs)
Corresponding ANSI C data types Size (bytes)
data8 char 1
data16 short 2
data32 int 4
data32 long int 4
data32 float 4
data32 enum 4
data16/data32 pointer
1
1. Pointers to small data areas, which can be accessed by global pointers are data16.
2/4
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Xilinx MicroBlaze Specifications

General

Architecture	32-bit RISC
Cache	Configurable Instruction and Data Cache
Category	Soft Processor Core
Data Width	32-bit
Memory Management Unit (MMU)	Optional
Floating Point Unit (FPU)	Optional
Interrupt Controller	Configurable
Memory Management	Optional MMU
Configurability	Highly Configurable
Pipeline Stages	3-stage
FPGA Integration	Xilinx FPGAs
Bus Interface	PLB
Debug Interface	JTAG
Typical Clock Speed	Varies depending on FPGA and configuration (e.g., 100-400+ MHz)
Implementation	Soft core (synthesized logic)
Maximum Performance	Varies with FPGA and configuration
Debug Support	Integrated Debug Module