memdump: a debugging utility to dump memory over a serial port

A memory-dumping utility which runs in real mode.  Thus, it can be
used to get memory dumps from a relatively pristine system.

1 files changed, 29 insertions, 0 deletions

diff --git a/memdump/__divdi3.c b/memdump/__divdi3.c
new file mode 100644
index 00000000..3641396f
--- /dev/null
+++ b/memdump/__divdi3.c
@@ -0,0 +1,29 @@
+/*
+ * arch/i386/libgcc/__divdi3.c
+ */
+
+#include <stdint.h>
+#include <stddef.h>
+
+extern uint64_t __udivmoddi4(uint64_t num, uint64_t den, uint64_t *rem);
+
+int64_t __divdi3(int64_t num, int64_t den)
+{
+  int minus = 0;
+  int64_t v;
+
+  if ( num < 0 ) {
+    num = -num;
+    minus = 1;
+  }
+  if ( den < 0 ) {
+    den = -den;
+    minus ^= 1;
+  }
+
+  v = __udivmoddi4(num, den, NULL);
+  if ( minus )
+    v = -v;
+
+  return v;
+}