Get Unit misc data pointer of ridden unit by r4

0007d0a0: 27bdffe8 addiu r29,r29,0xffe8
0007d0a4: afbf0010 sw r31,0x0010(r29)
0007d0a8: 90830130 lbu r3,0x0130(r4)
0007d0ac: 34020001 ori r2,r0,0x0001
0007d0b0: 14620004 bne r3,r2,0x0007d0c4
0007d0b4: 00801021 addu r2,r4,r0
0007d0b8: 90840131 lbu r4,0x0131(r4)
0007d0bc: 0c01e9b9 jal 0x0007a6e4
0007d0c0: 00000000 nop
0007d0c4: 8fbf0010 lw r31,0x0010(r29)
0007d0c8: 27bd0018 addiu r29,r29,0x0018
0007d0cc: 03e00008 jr r31
0007d0d0: 00000000 nop