Cpu Overview; Registers - Sony PlayStationPortable Documentation

4 CPU OVERVIEW

4 CPU Overview

4.1 Registers

32 32bit General Purpose Integer Registers (R0-R31)
0 zero wired zero
1 at assembler temp
2 v0 return value
3 v1
4 a0 argument registers
5 a1
6 a2
7 a3
8 t0 caller saved (o32 old style names: default)
9 t1
10 t2
11 t3
12 t4 caller saved
13 t5
14 t6
15 t7
16 s0 callee saved
17 s1
18 s2
19 s3
20 s4
21 s5
22 s6
23 s7
24 t8 caller saved
25 t9
26 k0 kernel temporary
27 k1
28 gp global pointer
29 sp stack pointer
30 fp/s8 frame pointer
31 ra return address
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