Call Attack Preparation (ability selected)

0017c3b8: 27bdffe8 addiu r29,r29,0xffe8
0017c3bc: afbf0010 sw r31,0x0010(r29)
0017c3c0: 00802821 addu r5,r4,r0               r5 = Misc. unit data
0017c3c4: 0c05f117 jal 0x0017c45c              Attack Preparation
0017c3c8: 00003021 addu r6,r0,r0               Ability selected function control
0017c3cc: 8fbf0010 lw r31,0x0010(r29)
0017c3d0: 27bd0018 addiu r29,r29,0x0018
0017c3d4: 03e00008 jr r31
0017c3d8: 00000000 nop

Return Locations

Battle.bin 
000753b4: Set move/act based on skillset