FE7 reverse source

.thumb
# To enable all difficulties:
# put 1F 20 70 47 at x9E9FC

# org x28FBA
.org 0xA
ldr r0, MethodAddr
bx r0

.align 2
MethodAddr: .word 0x09000001


.org 0x40
# check that the attacker is not red
# and check that the defender is red
ldr r0, AttackerAddr
ldr r1, DefenderAddr
ldrb r0, [r0, #0xB]
ldrb r1, [r1, #0xB]
mov r2, #0x80
and r0, r2
and r1, r2
cmp r0, #0x0
bne Abort
cmp r1, #0x80
bne Abort

# check that the defending red unit is armed
# a unit not being armed is the game's signal not to counter
ldr r0, DefenderAddr
mov r1, #0x48
ldrh r0, [r0, r1]
cmp r0, #0x0
beq Abort

# reverse turn order here
mov r0, r13
mov r1, r4
ldr r2, DefenderAddr
str r2, [r0]
ldr r0, AttackerAddr
str r0, [r1]
b Return

Abort:
mov r0, r13
mov r1, r4
ldr r2, AttackerAddr
str r2, [r0]
ldr r0, DefenderAddr
str r0, [r1]

Return:
ldr r0, ReturnAddr
bx r0

.align 2
AttackerAddr: .word 0x0203A3F0
DefenderAddr: .word 0x0203A470
ReturnAddr:   .word 0x08028FC5