[ASM & Hex✓] SOLVED:need help with looping my get-iv routine

tkim · May 15, 2017

I'm trying to make a routine that gets the IV values of a pokemon whose slot is stored at var 0x8007 and store those values into vars 0x8001-0x8006 and the total of those values into var 0x8000. I'm having a difficult time in allowing the routine to loop. here's my routine:

Code:

.text
.align 2
.thumb
.thumb_func
.global decryptor

main:
    push {r0-r5, lr}
    ldr r0, var_8007        @slot number should be in var_8007
    ldrh r0, [r0]
    mov r1, #0x64
    mul r1, r1, r0
    ldr r0, partypoke
    add r5, r1, r0        @slot loaded
    mov r1, #0x27
    ldr r3, var_8001
    mov r4, #0x0

decrypt:
    mov r0, r5
    ldr r2, poke_decrypt
    bl linker
    strh r0, [r3]            @store result into var_8001-8006
    add r4, r4, r0
    add r1, r1, #0x1
    cmp r1, #0x2D
    beq exit
    add r3, r3, #0x2
    b decrypt

exit:
    ldr r1, var_8000        @load var_8000
    strh r4, [r1]
    pop {r0-r5, pc}

linker:
    bx r2

.align 2
var_8000:    .word 0x20370B8
var_8001:    .word 0x20370BA
var_8007:    .word 0x20370C6
partypoke:    .word 0x2024284
poke_decrypt:    .word 0x803FBE8 + 1

When it attempts to loop, the game freezes.

NewDenverCity · May 15, 2017

tkim said:

I'm trying to make a routine that gets the IV values of a pokemon whose slot is stored at var 0x8007 and store those values into vars 0x8001-0x8006 and the total of those values into var 0x8000. I'm having a difficult time in allowing the routine to loop. here's my routine:

Code:

.text
.align 2
.thumb
.thumb_func
.global decryptor

main:
    push {r0-r5, lr}
    ldr r0, var_8007        @slot number should be in var_8007
    ldrh r0, [r0]
    mov r1, #0x64
    mul r1, r1, r0
    ldr r0, partypoke
    add r5, r1, r0        @slot loaded
    mov r1, #0x27
    ldr r3, var_8001
    mov r4, #0x0

decrypt:
    mov r0, r5
    ldr r2, poke_decrypt
    bl linker
    strh r0, [r3]            @store result into var_8001-8006
    add r4, r4, r0
    add r1, r1, #0x1
    cmp r1, #0x2D
    beq exit
    add r3, r3, #0x2
    b decrypt

exit:
    ldr r1, var_8000        @load var_8000
    strh r4, [r1]
    pop {r0-r5, pc}

linker:
    bx r2

.align 2
var_8000:    .word 0x20370B8
var_8001:    .word 0x20370BA
var_8007:    .word 0x20370C6
partypoke:    .word 0x2024284
poke_decrypt:    .word 0x803FBE8 + 1

When it attempts to loop, the game freezes.

r1 is changed during the pokedecrypt routine, use a higher register to store stuff, like you did for r5. Also the same thing is happening with r3.

tkim · May 16, 2017

NewDenverCity said:
r1 is changed during the pokedecrypt routine, use a higher register to store stuff, like you did for r5. Also the same thing is happening with r3.

Thank you very much. Your other post also helps a lot too!

Here's the fixed routine:

Code:

.text
.align 2
.thumb
.thumb_func
.global getiv

main:
    push {r4-r7, lr}
    ldr r0, =(0x20370C6)        @slot number should be in var_8007
    ldrh r0, [r0]
    mov r1, #0x64
    mul r1, r1, r0
    ldr r0, =(0x2024284) @partyram
    add r5, r1, r0        @slot loaded
    mov r6, #0x27
    mov r1, r6
    ldr r7, =(0x20370BA) @var8001
    mov r4, #0x0

decrypt:
    mov r0, r5
    ldr r2, =(0x803FBE8|1) @getattr
    bl linker
    strh r0, [r7]            @store result into var_8001
    add r4, r4, r0
    add r6, r6, #0x1
    cmp r6, #0x2D
    beq exit
    mov r1, r6
    add r7, r7, #0x2
    b decrypt

exit:
    ldr r1, =(0x20370B8)        @load var_8000
    strh r4, [r1]
    pop {r4-r7, pc}

linker:
    bx r2

.align 2