Altera Nios II User Manual page 206

8–26
callr
Operation:
Assembler Syntax:
Example:
Description:
Usage:
Exceptions:
Instruction Type:
Instruction Fields:
31 30 29 28 27 26 25
A
Nios II Processor Reference Handbook
ra ← PC + 4
PC ← rA
callr rA
callr r6
Saves the address of the next instruction in the return address register, and transfers execution
to the address contained in register rA.
callr is used to dereference C-language function pointers.
Misaligned destination address
R
A = Register index of operand rA
24 23 22 21 20 19 18 17
0 0x1f
call subroutine in register
16 15 14 13 12 11 10 9
0x1d
Chapter 8: Instruction Set Reference
Instruction Set Reference
8 7 6 5 4 3 2 1
0 0x3a
February 2014 Altera Corporation
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