add barebones actor spawning asm

Lua/inject.lua

@@ -10,9 +10,9 @@ end
 
 local asm_path
 if bizstring then
-    asm_path = "inject/crap.asm"
+    asm_path = "inject/spawn.asm"
 else
-    asm_path = "./mm/Lua/inject/crap.asm"
+    asm_path = "./mm/Lua/inject/spawn.asm"
 end
 
 local inject_addr, inject_maxlen, ow_addr, ow_before

Lua/inject/spawn.asm

@@ -0,0 +1,46 @@
+[actor_spawn]: 0x800BAE14
+
+[global_context]: 0x803E6B20
+[buttons_offset]: 0x14
+[actor_spawn_offset]: 0x1CA0
+
+[button_mask]: 0x0020
+[actor_to_spawn]: 0x0009
+
+        push    4, ra
+        li      t0, @global_context
+        lhu     t2, @buttons_offset(t0)
+        andi    t2, t2, @button_mask
+        beq     t2, r0, return
+        nop
+        li      a0, @actor_to_spawn
+        bal     simple_spawn
+        nop
+return:
+        jpop    4, ra
+
+simple_spawn: // args: a0 (actor to spawn)
+        push    4, 9, ra
+        mov     a2, a0
+        li      a1, @global_context
+        addi    a0, a1, @actor_spawn_offset
+        cl      a3 // unknown
+        mtc1    r0, F4 // X position?
+        mtc1    r0, F8 // Y position?
+        mtc1    r0, F16 // Z position?
+        // load up the rest of the args
+        sw      r0, 0x10(sp) // unknown
+        sw      r0, 0x14(sp) // X, Y rotations?
+        sw      r0, 0x18(sp) // Z rotation?
+        sw      r0, 0x1C(sp) // unknown
+        sw      r0, 0x20(sp) // unknown
+        sw      r0, 0x24(sp) // object number?
+        li      t0, 0x0000007F
+        sw      t0, 0x28(sp) // unknown
+        li      t0, 0x000003FF
+        sw      t0, 0x2C(sp) // unknown
+        sw      r0, 0x30(sp) // unknown
+        // and finally..
+        jal     @actor_spawn
+        nop
+        jpop    4, 9, ra