gdb helpers

toolchain/gdbinit

@@ -8,15 +8,50 @@ monitor quit
 quit
 end
 
-define reg
-monitor info registers
-end
-
 define reset
 monitor system_reset
 end
 
+define mmap
+monitor info mem
+end
+
 python
 import os
 gdb.execute('file ' + os.environ['BUILDROOT'] + '/sysroot/kernel')
 end
+
+python
+
+import re
+
+class Reg(gdb.Command):
+
+    def __init__(self):
+        super(Reg, self).__init__("reg", gdb.COMMAND_USER)
+
+    def invoke(self, arg, from_tty):
+        regs = gdb.execute('monitor info registers', False, True)
+
+        if not arg:
+            print(regs)
+            return
+
+        if arg.upper() in ['CS', 'DS', 'ES', 'FS', 'GS', 'SS']:
+            for l in regs.splitlines():
+                if l.startswith(arg.upper()):
+                    print(l)
+        elif arg.upper() in ['EFL', 'RFL']:
+            for l in regs.splitlines():
+                if arg.upper() in l:
+                    print(' '.join(l.split()[1:]))
+        else:
+            regex = f"\\b{arg.upper()}\\s?=[a-zA-Z0-9]*\\b"
+            matches = re.findall(regex, regs)
+            if matches:
+                print(matches[0])
+            else:
+                print(f"Register {arg.upper()} unknown")
+
+Reg()
+end