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Nios II Register Normal Usage
Remember the normal usage of registers in the NIOS II
32
Computer Science
Undergraduate 3
10/19/2014

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Cards

Term
R0
Definition
zero
or
0x00000000
Term
R1
Definition
at
or
Assembly Temporary
Term
R2
Definition
Return Value (least-significant 32 bits)
Term
R3
Definition
Return value (most-significant 32 bits)
Term
R4
Definition
Register arguments (first 32 bits)
Term
R5
Definition
Register arguments (second 32 bits)
Term
R6
Definition
Register arguments (third 32 bits)
Term
R7
Definition
Register arguments (fourth 32 bits)
Term
R8
Definition
Caller-saved general-purpose registers
Term
R9
Definition
Caller-saved general-purpose registers
Term
R10
Definition
Caller-saved general-purpose registers
Term
R11
Definition
Caller-saved general-purpose registers
Term
R12
Definition
Caller-saved general-purpose registers
Term
R13
Definition
Caller-saved general-purpose registers
Term
R14
Definition
Caller-saved general-purpose registers
Term
R15
Definition
Caller-saved general-purpose registers
Term
R16
Definition
Callee-saved general-purpose registers
Term
R17
Definition
Callee-saved general-purpose registers
Term
R18
Definition
Callee-saved general-purpose registers
Term
R19
Definition
Callee-saved general-purpose registers
Term
R20
Definition
Callee-saved general-purpose registers
Term
R21
Definition
Callee-saved general-purpose registers
Term
R22
Definition
Callee-saved general-purpose registers
Term
R23
Definition
Callee-saved general-purpose registers
Term
R24
Definition
et
or
Exception temporary
Term
R25
Definition
bt
or
Break temporary
Term
R26
Definition
gp
or
Global pointer
Term
R27
Definition
sp
or
Stack pointer
Term
R28
Definition
fp
or
Frame pointer
Term
R29
Definition
ea
or
Exception return address
Term
R30
Definition
ba
or
Normal register set: Break return address
Shadow register sets: SSTATUS register
Term
R31
Definition
ra
or
Return address
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