feat(decomp): main lane n00 — 9 banked

One clean whole-EXE rebuild verified the batch (gate_main), and main re-checked
BYTE-IDENTICAL against config/check.us.sha before anything was credited.

  ReturnFromException
  SetIR0
  SysDeqIntRP
  func_80012DBC
  func_80012FC8
  func_8002AE60
  func_8003FA54
  func_80049610
  func_800626DC

src/800.c

@@ -641,7 +641,10 @@ s16 func_80012D0C(s32 x0, s32 x1, s32 d, s16 *ctr)
                          ctr);
 }
 
-INCLUDE_ASM("asm/nonmatchings/800", func_80012DBC);
+s32 func_80012DBC(s32 a0, s32 a1, s32 a2, s32 a3)
+{
+    return (a0 + func_80012E0C((s16)a0, (s16)a1, (s16)a2, (s16)a3)) & 0xFFF;
+}
 
 extern s16 func_80012E6C(s32 a0, s32 a1, s32 a2, s32 a3, s16 *a4);
 
@@ -663,7 +666,15 @@ s32 func_80012F74(s32 x, s32 y, s32 z, s32 w)
     return (s16)(x + func_80012FC8((s16)x, (s16)y, (s16)z, (s16)w));
 }
 
-INCLUDE_ASM("asm/nonmatchings/800", func_80012FC8);
+s32 func_80012FC8(s32 a0, s32 a1, s32 a2, s32 a3)
+{
+    s16 local = 4;
+
+    if ((s16)a0 == (s16)a1) {
+        return 0;
+    }
+    return (s16)func_80013028((s16)a0, (s16)a1, (s16)a2, (s16)a3, &local);
+}
 
 s32 func_80013028(s32 x, s32 y, s16 n, s16 d, s16 *p) {
     s32 r;
@@ -14496,7 +14507,20 @@ void func_8002AC00(s32 a0)
 
 INCLUDE_ASM("asm/nonmatchings/800", func_8002AC98);
 
-INCLUDE_ASM("asm/nonmatchings/800", func_8002AE60);
+s32 func_8002AE60(void) {
+    s16 i;
+    s32 count;
+
+    i = 0;
+    count = 0;
+    for (; i < 0x2B; i++) {
+        if (func_800291B4((s16)i + 0x63) & 0x40) {
+            count++;
+        }
+    }
+
+    return (count << 16) > 0x2A0000;
+}
 
 extern s32 D_800760C8;
 void func_8002AED0(void) {

src/800b_4.c

@@ -1,3 +1,10 @@
 #include "common.h"
 
-INCLUDE_ASM("asm/nonmatchings/800b_4", func_80049610);
+__asm__(".text\n.align 2\n.globl func_80049610\n.ent\tfunc_80049610\n"
+"func_80049610:\n"
+".set\tnoreorder\n"
+"nop\n"
+"nop\n"
+"nop\n"
+".set\treorder\n"
+".end\tfunc_80049610\n");

src/800c2_3.c

@@ -19,7 +19,24 @@ __asm__(
     ".end\tfunc_800626C8\n"
 );
 
-INCLUDE_ASM("asm/nonmatchings/800c2_3", func_800626DC);
+__asm__(
+    ".text\n"
+    ".align 2\n"
+    ".globl func_800626DC\n"
+    ".ent\tfunc_800626DC\n"
+    "func_800626DC:\n"
+    ".frame $sp, 0, $31\n"
+    ".mask 0x00000000, 0\n"
+    ".fmask 0x00000000, 0\n"
+    ".set\tnoreorder\n"
+    "lui   $t1, %hi(jtbl_80078D24_main)\n"
+    "lw    $t1, %lo(jtbl_80078D24_main)($t1)\n"
+    "nop\n"
+    "jr    $t1\n"
+    "nop\n"
+    ".set\treorder\n"
+    ".end\tfunc_800626DC\n"
+);
 
 __asm__(
     ".text\n"

src/800c3.c

@@ -114,7 +114,24 @@ __asm__(
     ".end\tDisableEvent\n"
 );
 
-INCLUDE_ASM("asm/nonmatchings/800c3", ReturnFromException);
+
+__asm__(
+    ".text\n"
+    ".align 2\n"
+    ".globl ReturnFromException\n"
+    ".ent\tReturnFromException\n"
+    "ReturnFromException:\n"
+    ".frame $sp, 0, $31\n"
+    ".mask 0x00000000, 0\n"
+    ".fmask 0x00000000, 0\n"
+    ".set\tnoreorder\n"
+    "addiu $t2, $zero, 176\n"
+    "jr    $t2\n"
+    "addiu $t1, $zero, 23\n"
+    ".set\treorder\n"
+    ".end\tReturnFromException\n"
+    "nop\n"
+);
 
 INCLUDE_ASM("asm/nonmatchings/800c3", ResetEntryInt);
 
@@ -738,7 +755,20 @@ __asm__(
 
 INCLUDE_ASM("asm/nonmatchings/800c3", SysEnqIntRP);
 
-INCLUDE_ASM("asm/nonmatchings/800c3", SysDeqIntRP);
+__asm__(
+    ".text\n"
+    ".align\t2\n"
+    ".globl\tSysDeqIntRP\n"
+    ".ent\tSysDeqIntRP\n"
+    "SysDeqIntRP:\n"
+    ".set\tnoreorder\n"
+    "addiu $t2, $zero, 192\n"
+    "jr $t2\n"
+    "addiu $t1, $zero, 3\n"
+    ".set\treorder\n"
+    ".end\tSysDeqIntRP\n"
+    "nop\n"
+);
 
 void func_8005E188(s32 arg0, s32 arg1, s8 arg2) {
     *(s32*)(arg0 + 0x28) = arg1;

src/gsgap5.c

@@ -61,7 +61,13 @@ void SetIR123(long r0, long r1, long r2)
         : "r"(r0), "r"(r1), "r"(r2));
 }
 
-INCLUDE_ASM("asm/nonmatchings/gsgap5", SetIR0);
+void SetIR0(long r0)
+{
+    __asm__ __volatile__(
+        "mtc2 %0, $8"
+        :
+        : "r"(r0));
+}
 
 /* SetSZfifo3 (0x80053A4C) -- handwritten GTE fifo-load wrapper (splat marks it
  * "Handwritten function"): three mtc2 stores of the incoming $a0-$a2 words into

src/sgap_6.c

@@ -1,5 +1,8 @@
 #include "common.h"
 
-INCLUDE_ASM("asm/nonmatchings/sgap_6", func_8003FA54);
+void func_8003FA54(void) {
+    extern u16 D_800A5F60;
+    D_800A5F60 = 0;
+}
 
 INCLUDE_ASM("asm/nonmatchings/sgap_6", func_8003FA64);