From e689d62067bf3278dd434f8addfca9253326445d Mon Sep 17 00:00:00 2001
From: joevt <joevt@shaw.ca>
Date: Mon, 30 Mar 2026 04:19:21 -0700
Subject: [PATCH] debugger: Parse BAT registers.

---
 cpu/ppc/ppcmmu.h      |  3 +++
 debugger/debugger.cpp | 28 +++++++++++++++++-----------
 2 files changed, 20 insertions(+), 11 deletions(-)

diff --git a/cpu/ppc/ppcmmu.h b/cpu/ppc/ppcmmu.h
index 09b32426..be938fd5 100644
--- a/cpu/ppc/ppcmmu.h
+++ b/cpu/ppc/ppcmmu.h
@@ -120,6 +120,9 @@ enum TLBFlags : uint16_t {
 extern std::function<void(uint32_t bat_reg)> ibat_update;
 extern std::function<void(uint32_t bat_reg)> dbat_update;
 
+extern PPC_BAT_entry ibat_array[4];
+extern PPC_BAT_entry dbat_array[4];
+
 extern MapDmaResult mmu_map_dma_mem(uint32_t addr, uint32_t size, bool allow_mmio);
 
 extern void mmu_change_mode(void);
diff --git a/debugger/debugger.cpp b/debugger/debugger.cpp
index 40431f43..a42095c1 100644
--- a/debugger/debugger.cpp
+++ b/debugger/debugger.cpp
@@ -526,18 +526,24 @@ static void print_mmu_regs()
 
     printf("\nBAT registers:\n");
 
-    for (int i = 0; i < 4; i++) {
-        printf(" ibat%du : %08X   ibat%dl : %08X\n",
-              i, ppc_state.spr[528+i*2],
-              i, ppc_state.spr[529+i*2]);
-    }
-
-    if (!is_601) {
-        for (int i = 0; i < 4; i++) {
-            printf(" dbat%du : %08X   dbat%dl : %08X\n",
-                  i, ppc_state.spr[536+i*2],
-                  i, ppc_state.spr[537+i*2]);
+    for (int i = 0; i < 4 + (is_601 ? 0 : 4); i++) {
+        PPC_BAT_entry *bat_entry = i < 4 ? ibat_array : dbat_array;
+        bat_entry = &bat_entry[i & 3];
+        printf(" %sbat%du : %08X   ibat%dl : %08X   ;   range : %08X..%08X -> %08X..%08X   access : %s%s   protection : %s%s",
+            is_601 ? "" : i < 4 ? "i" : "d",
+            i & 3, ppc_state.spr[528+i*2],
+            i & 3, ppc_state.spr[529+i*2],
+            bat_entry->bepi, bat_entry->bepi + ~bat_entry->hi_mask,
+            bat_entry->phys_hi, bat_entry->phys_hi + ~bat_entry->hi_mask,
+            bat_entry->access & 2 ? is_601 ? "Ks" : "Vs" : "__",
+            bat_entry->access & 1 ? is_601 ? "Ku" : "Vp" : "__",
+            bat_entry->prot & 2 ? "P" : "_",
+            bat_entry->prot & 1 ? "P" : "_"
+        );
+        if (is_601) {
+            printf("   (%s)", bat_entry->valid ? "valid" : "invalid");
         }
+        printf("\n");
     }
 
     printf("\n");