From fbd57d38e1a633dac8f0a5a907a9416ebd2ca464 Mon Sep 17 00:00:00 2001
From: Christopher Williams <christopherdavidwilliams21@gmail.com>
Date: Fri, 25 Sep 2026 10:39:15 -0400
Subject: [PATCH] phase12: track verified adjacency sources

---
 src/func_8008FFC4.c | 27 +++++++++++++++++++++++++++
 src/func_80107D18.c | 38 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 65 insertions(+)
 create mode 100644 src/func_8008FFC4.c
 create mode 100644 src/func_80107D18.c

diff --git a/src/func_8008FFC4.c b/src/func_8008FFC4.c
new file mode 100644
index 0000000..404636f
--- /dev/null
+++ b/src/func_8008FFC4.c
@@ -0,0 +1,27 @@
+/*
+ * func_8008FFC4 — 100 bytes at 0x8008FFC4..0x80090028
+ *
+ * Gate one callback on a gp sentinel, then dispatch on the low byte of the
+ * argument to one of two no-argument callbacks.
+ *
+ * The globals and helper purposes are address-based hypotheses; the byte
+ * match is the evidence for this region.
+ */
+
+extern int D_80121EF4;
+extern int D_80122660;
+extern int D_80122670;
+extern void func_8008FCD8(int, int);
+extern void func_80100334(void);
+extern void func_8010036C(void);
+
+void func_8008FFC4(int a0)
+{
+    if (D_80121EF4 != -1)
+        func_8008FCD8(D_80122660, D_80122670);
+
+    if ((a0 & 0xff) != 0)
+        func_80100334();
+    else
+        func_8010036C();
+}
diff --git a/src/func_80107D18.c b/src/func_80107D18.c
new file mode 100644
index 0000000..2b0347f
--- /dev/null
+++ b/src/func_80107D18.c
@@ -0,0 +1,38 @@
+/*
+ * func_80107D18 — 100 bytes at 0x80107D18..0x80107D7C
+ *
+ * Insert a node into a doubly linked list, updating the head when the list is
+ * empty. The next field is cleared before the list walk so its store occupies
+ * the branch delay slot in the original.
+ *
+ * The list field meanings and global names are address-based hypotheses; the
+ * byte match is the evidence for this region.
+ */
+
+extern int D_801221C4;
+extern int D_801221C8;
+
+void func_80107D18(int *a0)
+{
+    int *p = (int *)D_801221C4;
+
+    D_801221C8 = 1;
+    if (p == a0)
+        goto done;
+    if (a0[0] != 0)
+        goto done;
+    a0[1] = 0;
+
+    if (p == 0) {
+        D_801221C4 = (int)a0;
+        a0[0] = 0;
+    } else {
+        while (p[1] != 0)
+            p = (int *)p[1];
+        p[1] = (int)a0;
+        a0[0] = (int)p;
+    }
+
+done:
+    D_801221C8 = 0;
+}