Created student weenix repository

1 files changed, 25 insertions, 0 deletions

diff --git a/python/weenix/debug_userland.py b/python/weenix/debug_userland.py
new file mode 100644
index 0000000..07e8cc3
--- /dev/null
+++ b/python/weenix/debug_userland.py
@@ -0,0 +1,25 @@
+from elftools.elf.elffile import ELFFile
+from os import path
+
+class DebugUserland(gdb.Command):
+    def __init__(self):
+      super(DebugUserland, self).__init__("debug-userland", gdb.COMMAND_USER)
+
+    def invoke(self, arg, from_tty):
+        directory = 'user/usr/bin/'
+        filename = directory + arg + '.exec'
+        if not path.exists(filename):
+            filename = 'user/bin/' + arg + '.exec'
+        if arg == 'init':
+            filename = 'user/sbin/init.exec'
+        elf = ELFFile(open(filename, 'rb'))
+        text_section = elf.get_section_by_name('.text')
+        entry = text_section.header.sh_addr
+        gdb.execute(f"add-symbol-file {filename} {entry}")
+
+        symtab = elf.get_section_by_name('.symtab')
+        main = symtab.get_symbol_by_name('main')[0]
+        main_addr = main.entry.st_value
+        gdb.execute(f"break *{main_addr}")
+        
+DebugUserland()