save.c - sub_8011CA8() to ReadSaveSector()

asm/save.s

@@ -5,143 +5,6 @@
 
 	.text
 
-	thumb_func_start sub_8011CA8
-sub_8011CA8:
-	push {lr}
-	adds r3, r0, 0
-	adds r2, r1, 0
-	ldr r0, =gUnknown_203B184
-	ldr r0, [r0]
-	ldr r0, =0xfff
-	adds r1, r2, r0
-	cmp r1, 0
-	bge _08011CBE
-	ldr r0, =0x1ffe
-	adds r1, r2, r0
-_08011CBE:
-	asrs r1, 12
-	ldr r0, [r3]
-	adds r0, r1
-	str r0, [r3]
-	pop {r0}
-	bx r0
-	.align 2, 0
-	.pool
-	thumb_func_end sub_8011CA8
-
-	thumb_func_start WriteSaveSector
-WriteSaveSector:
-	push {r4-r6,lr}
-	adds r5, r1, 0
-	adds r4, r2, 0
-	ldr r6, [r0]
-	adds r1, r4, 0
-	bl sub_8011CA8
-	adds r0, r5, 0
-	adds r1, r4, 0
-	bl CalculateChecksum
-	ldr r0, _08011D04
-	ldr r0, [r0]
-	cmp r0, 0
-	bne _08011D08
-	adds r0, r6, 0
-	adds r1, r5, 0
-	adds r2, r4, 0
-	bl WriteFlashData
-	adds r1, r0, 0
-	b _08011D28
-	.align 2, 0
-_08011D04: .4byte gUnknown_203B184
-_08011D08:
-	bl sub_800DAB8
-	lsls r0, 24
-	cmp r0, 0
-	beq _08011D38
-	lsls r0, r6, 16
-	lsrs r0, 16
-	adds r1, r5, 0
-	adds r2, r4, 0
-	bl sub_800DAB4
-	lsls r0, 24
-	movs r1, 0
-	cmp r0, 0
-	bne _08011D28
-	movs r1, 0x3
-_08011D28:
-	cmp r1, 0x4
-	bne _08011D30
-	movs r0, 0x1
-	b _08011D3A
-_08011D30:
-	cmp r1, 0
-	bne _08011D38
-	movs r0, 0
-	b _08011D3A
-_08011D38:
-	movs r0, 0x2
-_08011D3A:
-	pop {r4-r6}
-	pop {r1}
-	bx r1
-	thumb_func_end WriteSaveSector
-
-	thumb_func_start ReadSaveSector
-ReadSaveSector:
-	push {r4-r6,lr}
-	adds r5, r1, 0
-	adds r4, r2, 0
-	ldr r6, [r0]
-	adds r1, r4, 0
-	bl sub_8011CA8
-	ldr r0, _08011D64
-	ldr r0, [r0]
-	cmp r0, 0
-	bne _08011D68
-	adds r0, r6, 0
-	adds r1, r5, 0
-	adds r2, r4, 0
-	bl ReadFlashData
-	adds r1, r0, 0
-	b _08011D86
-	.align 2, 0
-_08011D64: .4byte gUnknown_203B184
-_08011D68:
-	bl sub_800DAB8
-	lsls r0, 24
-	cmp r0, 0
-	beq _08011D8A
-	lsls r0, r6, 16
-	lsrs r0, 16
-	adds r1, r5, 0
-	adds r2, r4, 0
-	bl sub_800DAB0
-	lsls r0, 24
-	movs r1, 0
-	cmp r0, 0
-	beq _08011D8A
-_08011D86:
-	cmp r1, 0
-	beq _08011D8E
-_08011D8A:
-	movs r0, 0x1
-	b _08011DA2
-_08011D8E:
-	adds r0, r5, 0
-	adds r1, r4, 0
-	bl ValidateChecksum
-	lsls r0, 24
-	cmp r0, 0
-	bne _08011DA0
-	movs r0, 0
-	b _08011DA2
-_08011DA0:
-	movs r0, 0x2
-_08011DA2:
-	pop {r4-r6}
-	pop {r1}
-	bx r1
-	thumb_func_end ReadSaveSector
-
 	thumb_func_start sub_8011DA8
 sub_8011DA8:
 	movs r0, 0x1

asmdiff.sh

@@ -4,4 +4,4 @@ OBJDUMP="$DEVKITARM/bin/arm-none-eabi-objdump -D -bbinary -marmv4t -Mforce-thumb
 OPTIONS="--start-address=$(($1)) --stop-address=$(($1 + $2))"
 $OBJDUMP $OPTIONS baserom.gba > baserom.dump
 $OBJDUMP $OPTIONS pmd_red.gba > pmd_red.dump
-diff -u baserom.dump pmd_red.dump | less
+diff -u baserom.dump pmd_red.dump

src/save.c

@@ -2,9 +2,14 @@
 
 extern u32 gUnknown_203B17C;
 extern u32 gUnknown_203B180;
-extern u32 *gUnknown_203B184;
+extern vu32 gUnknown_203B184;
 extern u32 gUnknown_202DE28;
 
+extern s32 ReadFlashData(s32 sector, u8 *src, s32 size);
+extern s32 WriteFlashData(s32 sector, u8 *src, s32 size);
+extern bool8 sub_800DAB0(u16, u8*, s32);
+extern bool8 sub_800DAB4(u16, u8*, s32);
+extern bool8 sub_800DAB8(void);
 
 u32 sub_8011C1C(void)
 {
@@ -62,3 +67,63 @@ bool8 ValidateChecksum(u8 *in, u32 size)
         return TRUE;
     return FALSE;
 }
+
+void sub_8011CA8(u32 *out, s32 b)
+{
+    gUnknown_203B184; // Needed to match
+    *out += (b + 0xFFF) / 0x1000;
+}
+
+u32 WriteSaveSector(u32 *a, u8 *b, s32 size, u32 d)
+{
+    u32 r6 = *a;
+    u32 num;
+    sub_8011CA8(a, size);
+    CalculateChecksum(b, size);
+    if (!gUnknown_203B184) {
+        num = WriteFlashData(r6, b, size);
+    }
+    else if (sub_800DAB8()) {
+        num = sub_800DAB4(r6, b, size) ? 0 : 3;
+    }
+    else {
+        return 2;
+    }
+    if (num == 4) {
+        return 1;
+    }
+    else if (num) {
+        return 2;
+    }
+    else {
+        return 0;
+    }
+}
+
+u32 ReadSaveSector(u32 *a, u8 *b, s32 size, u32 d)
+{
+    u32 r6 = *a;
+    u32 num;
+    sub_8011CA8(a, size);
+    if (!gUnknown_203B184) {
+        num = ReadFlashData(r6, b, size);
+    }
+    else if (sub_800DAB8()) {
+        if (!sub_800DAB0(r6, b, size)) {
+            num = 1;
+        }
+        else {
+            num = 0;
+        }
+    }
+    else {
+        return 1;
+    }
+    if (num) {
+        return 1;
+    }
+    if (ValidateChecksum(b, size)) {
+        return 2;
+    }
+    return 0;    
+}