First Commit

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

home/farcall.asm

@@ -0,0 +1,48 @@
+FarCall_de::
+; Call a:de.
+; Preserves other registers.
+	ldh [hTempBank], a
+	ldh a, [hROMBank]
+	push af
+	ldh a, [hTempBank]
+	rst Bankswitch
+	call FarCall_JumpToDE
+	jr ReturnFarCall
+
+FarCall_JumpToDE:
+	push de
+	ret
+
+FarCall_hl::
+; Call a:hl.
+; Preserves other registers.
+	ldh [hTempBank], a
+	ldh a, [hROMBank]
+	push af
+	ldh a, [hTempBank]
+	rst Bankswitch
+	call FarCall_JumpToHL
+	; fallthrough
+
+ReturnFarCall::
+; We want to retain the contents of f.
+; To do this, we can pop to bc instead of af.
+	ld a, b
+	ld [wFarCallBC], a
+	ld a, c
+	ld [wFarCallBC + 1], a
+
+; Restore the working bank.
+	pop bc
+	ld a, b
+	rst Bankswitch
+
+; Restore the contents of bc.
+	ld a, [wFarCallBC]
+	ld b, a
+	ld a, [wFarCallBC + 1]
+	ld c, a
+	ret
+
+FarCall_JumpToHL::
+	jp hl