emu_main: hook the runtime integer-divide (0xf042ee00, r22=r22/r23) with exact host division -- the compiled Newton-Raphson needs exact dual-op pipe timing; geometry stream now consumes frames correctly (replay passes cmd 151 blocker, 387+ commands)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

emulator/firmware-decomp/emu_main.py

@@ -56,6 +56,7 @@ MAPS = {
         alloc=0xf042c628, v2p=0xf042c300,
         lockacq=0xf0423360, lockrel=0xf04233b8,
         chain=None, chain_tbl=None, chain_tail=None,
+        intdiv=0xf042ee00,                # runtime int divide (r22 = r22/r23)
         seeds=[
             (0x1000, 0),                  # _processorId
         ],
@@ -101,6 +102,20 @@ class MainRunner:
         if m['sendprim']: self.hooks[m['sendprim']] = self.h_ret
         if m['putchar']:  self.hooks[m['putchar']] = self.h_console
         if m['chain']:    self.hooks[m['chain']] = self.h_chainfix
+        if m.get('intdiv'): self.hooks[m['intdiv']] = self.h_intdiv
+
+    def h_intdiv(self, cpu):
+        # Runtime integer divide (r22 = r22/r23, result via ftrunc+fxfr): the
+        # compiled Newton-Raphson relies on exact dual-op pipeline timing our
+        # functional FP model doesn't reproduce yet -- compute exactly instead.
+        a = cpu.rd(22); b = cpu.rd(23)
+        if a & 0x80000000: a -= 1 << 32
+        if b & 0x80000000: b -= 1 << 32
+        q = abs(a) // abs(b) if b else 0
+        if (a < 0) != (b < 0): q = -q
+        cpu.wr(22, q & 0xffffffff)
+        cpu.pc = cpu.rd(1)
+        return True
         self.heap = [0x08010000, 0x0c010000]   # bump allocator over the DRAM banks
 
     # ---- hook helpers: emulate a called function returning ----