Refactored platform code to use interfaces for patch code with a special feature and improved patch code file names

arm9/source/patches/SaveOffsetToSdSectorPatchCode.s

@@ -0,0 +1,50 @@
+.cpu arm7tdmi
+.section "saveoffsettosdsector", "ax"
+.syntax unified
+.thumb
+
+// r0 = save offset
+// returns sd sector in r0
+// returns cluster shift in r1
+// returns remaining sectors in cluster in lr
+.global save_offset_to_sd_sector_asm
+.type save_offset_to_sd_sector_asm, %function
+save_offset_to_sd_sector_asm:
+    push {r4,r5,lr}
+retry:
+    ldr r5, saveoffsettosdsector_fatDataPtr
+    ldmia r5!, {r1,r2,r3,r4} // clusterShift, database, clusterMask, clusterMap[0]
+    lsrs r0, r0, #9
+    adds r4, r3, #1
+    ands r3, r0
+    subs r4, r3
+    mov lr, r4 // remaining sectors in cluster
+    adds r3, r2
+    lsrs r0, r1 // cl
+1:
+    ldmia r5!, {r2,r4} // ncl, startSector
+    cmp r2, #0
+    beq out_of_bounds
+    subs r0, r2 // cl -= ncl
+    bcs 1b
+
+    adds r0, r2
+    adds r0, r4 // + startSector
+    subs r0, #2 // - 2
+    lsls r0, r1
+    adds r0, r3 // r0 = src sector
+    pop {r4,r5,pc}
+
+out_of_bounds:
+    movs r0, #0
+    pop {r4,r5,pc}
+
+.balign 4
+
+.global saveoffsettosdsector_fatDataPtr
+saveoffsettosdsector_fatDataPtr:
+    .word 0x027FFA00
+
+.pool
+
+.end