From 16f138052c5b7c4a3461b1ae738b6ad9fd7aaf7b Mon Sep 17 00:00:00 2001
From: kwolekr <kwolekr@minetest.net>
Date: Mon, 2 Dec 2024 05:41:24 -0500
Subject: [PATCH] debugger: Add dumpmem command

---
 README         |  3 +++
 src/debugger.c | 41 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+)

diff --git a/README b/README
index f68732f..514b4e8 100644
--- a/README
+++ b/README
@@ -174,6 +174,9 @@ write
   write <addr> w <value>  Write a word value (4 bytes) to <addr>
   write <addr> d <value>  Write a double-word value (8 bytes) to <addr>
 
+dumpmem <addr> <n> <filename>
+  Dump <n> bytes of RDRAM memory starting at <addr> to <filename>.
+
 translate
   Translates virtual memory addresses to physical memory addresses. Memory
   read/write breakpoints must operate on physical addresses, in contrast to the
diff --git a/src/debugger.c b/src/debugger.c
index 030f5cd..8eb9678 100644
--- a/src/debugger.c
+++ b/src/debugger.c
@@ -346,6 +346,47 @@ int debugger_loop(void *arg) {
                 printf("\n");
             }
         }
+        else if (strncmp(input, "dumpmem", 7) == 0) {
+            uint32_t addr;
+            uint32_t len;
+            char filename[64];
+
+            uint8_t *membase;
+            FILE *f;
+
+            if (sscanf(input, "dumpmem %x 0x%x %63s", &addr, &len, filename) != 3 &&
+                sscanf(input, "dumpmem %x %u %63s",   &addr, &len, filename) != 3) {
+                printf("Improperly formatted dumpmem command: '%s'\n", input);
+                continue;
+            }
+
+            filename[sizeof(filename) - 1] = '\0';
+
+            addr = (*DebugVirtualToPhysical)(addr);
+            if (addr >= 0x800000) {
+                printf("Requested address must be within RDRAM region\n");
+                continue;
+            }
+
+            // 8 MB is the upper limit
+            if (len > 0x800000 - addr)
+                len = 0x800000 - addr;
+
+            membase = (*DebugMemGetPointer)(M64P_DBG_PTR_RDRAM);
+
+            f = fopen(filename, "wb");
+            if (f == NULL) {
+                printf("Could not open file '%s' for write\n", filename);
+                continue;
+            }
+
+            fwrite(membase + addr, len, 1, f);
+
+            fclose(f);
+
+            printf("Dumped 0x%08x bytes starting at 0x%08x to %s\n",
+                len, addr, filename);
+        }
         else if (strncmp(input, "translate", 9) == 0) {
             uint32_t virt_addr, phys_addr;
             if (sscanf(input, "translate %i", &virt_addr) == 1) {