Implement balloon time and unused evil trampoline

Author: cyndifusic

src/hooks/Jsk/items_Jsk.cpp

@@ -37,6 +37,32 @@ TRAMPOLINE_DEF(0x8058321c, 0x80583220) {
     // clang-format on
 }
 
+/**
+ * @brief Sets the balloon time in Power Cruising
+ *
+ */
+int JskSetBalloons() {
+    return ItemMgr::GetInstance().GetJskFreeTimerNum() * 12;
+}
+
+/**
+ * @brief JskSetBalloons trampoline
+ */
+TRAMPOLINE_DEF(0x80581eb0, 0x80581eb4) {
+    // clang-format off
+    TRAMPOLINE_BEGIN
+
+    bl JskSetBalloons
+    mr r0, r3
+
+    TRAMPOLINE_END
+    mr r4, r0
+    li r0, 0
+    
+    blr
+    // clang-format on
+}
+
 /**
  * @brief Unlocks Boosting in Power Cruising
  */

src/hooks/trampoline.h

@@ -75,4 +75,37 @@
     addi r1, r1, 0x100;
 // clang-format on
 
+/******************************************************************************
+ *
+ * Save/restore all registers (r3-r31) and leave room on the stack
+ *
+ ******************************************************************************/
+
+/**
+ * @brief Saves *ALL* registers at the start of a trampoline function
+ */
+// clang-format off
+#define TRAMPOLINE_BEGIN_SP(length) \
+    nofralloc          ;            \
+    stwu r1, (-0x100 - length)(r1); \
+    stmw r3, (0x0C + length)(r1) ;  \
+    mflr r12           ;            \
+    stw  r12, (0x08 + length)(r1) ;            \
+    mfcr r12           ;            \
+    stw  r12, (0x88 + length)(r1) ;            \
+// clang-format on
+
+/**
+ * @brief Restores registers at the end of a trampoline function
+ */
+// clang-format off
+#define TRAMPOLINE_END_SP(length)  \
+    lwz  r12, (0x88 + length)(r1);            \
+    mtcr r12          ;            \
+    lwz  r12, (0x08 + length)(r1);            \
+    mtlr r12          ;            \
+    lmw  r3, (0x0C + length)(r1);            \
+    addi r1, r1, (0x100 + length); \
+// clang-format on
+
 #endif