Nios® II Processor Reference Guide

ID 683836
Date 10/22/2020
Public
Document Table of Contents

8.5.19. call

Instruction call subroutine
Operation

ra ←  PC + 4

PC ←  (PC31..28 : IMM26 x 4)

Assembler Syntax

call label

Example

call write_char

Description

Saves the address of the next instruction in register ra, and transfers execution to the instruction at address (PC31..28 : IMM26 x 4).

Usage

call can transfer execution anywhere within the 256-MB range determined by PC31..28. The Nios II GNU linker does not automatically handle cases in which the address is out of this range.

Exceptions

None

Instruction Type

J

Instruction Fields

IMM26 = 26-bit unsigned immediate value

Bit Fields
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
IMM26
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
IMM26 0

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