First Commit

Upload literally everything from the pokecrystal16 expand-move-ID branch

home/predef.asm

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+Predef::
+; Call predefined function a.
+; Preserves bc, de, hl and f.
+
+	ld [wPredefID], a
+	ldh a, [hROMBank]
+	push af
+
+	ld a, BANK(GetPredefPointer)
+	rst Bankswitch
+	call GetPredefPointer ; stores hl in wPredefHL
+
+; Switch to the new function's bank
+	rst Bankswitch
+
+; Instead of directly calling stuff,
+; push it to the stack in reverse.
+
+	ld hl, .Return
+	push hl
+
+; Call the Predef function
+	ld a, [wPredefAddress]
+	ld h, a
+	ld a, [wPredefAddress + 1]
+	ld l, a
+	push hl
+
+; Get hl back
+	ld a, [wPredefHL]
+	ld h, a
+	ld a, [wPredefHL + 1]
+	ld l, a
+	ret
+
+.Return:
+; Clean up after the Predef call
+
+	ld a, h
+	ld [wPredefHL], a
+	ld a, l
+	ld [wPredefHL + 1], a
+
+	pop hl
+	ld a, h
+	rst Bankswitch
+
+	ld a, [wPredefHL]
+	ld h, a
+	ld a, [wPredefHL + 1]
+	ld l, a
+	ret