add SpawnYoshi code

NTSC-J 1.0/SpawnYoshi.txt

@@ -0,0 +1,15 @@
+28400D50 000F0800
+C0000000 0000000C
+818D98B8 7D8C6379
+4D820020 806C03F0
+7C631B79 4D820020
+812C03E4 7D294B79
+4182000C 38000000
+98091C84 3CA08040
+A0A50D50 54A50EFD
+4D820020 3C006300
+5C002FBE 980300D0
+38000008 98030000
+80030008 9003000C
+4E800020 00000000
+E0000000 00000000

README.md

@@ -48,3 +48,10 @@ Ported from JoshuaMK's
 by [mapping memory among versions](https://github.com/sup39/supSMS-Utils/blob/main/GeckoConverter/convert.ipynb).
 
 The function `TBathWaterFlatRenderer::render` is missing in NTSC-J 1.1 and PAL, and therefore the related codes are removed in these two versions.
+
+### Spawn Yoshi
+Press `Y +` the following button to spawn Yoshi with specific color and make Mario ride on Yoshi
+- `D-Pad Left`: Orange
+- `D-Pad Right`: Purple
+- `D-Pad Down`: Pink
+- `D-Pad Up`: Green

src/SpawnYoshi.s

@@ -0,0 +1,30 @@
+.set rMario, 12
+.set rFLUDD, 9
+.set rYoshi, 3
+
+lwz rMario, -0x6748(r13)
+mr. rMario, rMario
+beqlr-
+
+lwz rYoshi, 0x3F0(rMario)
+mr. rYoshi, rYoshi
+beqlr-
+
+lwz rFLUDD, 0x3E4(rMario)
+mr. rFLUDD, rFLUDD
+beq- .L1
+li r0, 0
+stb r0, 0x1C84(rFLUDD)
+.L1:
+
+lis r5, 0x8040
+lhz r5, 0x0D50(r5)
+rlwinm. r5, r5, 1, 30-3, 30
+beqlr-
+lis r0, 0x6300
+rlwnm r0, r0, r5, 0x3
+stb r0, 0xD0(rYoshi)
+li r0, 8
+stb r0, 0(rYoshi)
+lwz r0, 8(rYoshi)
+stw r0, 0xC(rYoshi)