Autogenerating the break_virtual symbol

scripts/loader/generate_break_virtual.py

@@ -0,0 +1,64 @@
+#! /usr/bin/env python2.6
+# -*- mode: python; coding: utf-8; -*-
+#
+#  Codezero -- a microkernel for embedded systems.
+#
+#  Copyright © 2009  B Labs Ltd
+#
+import os, sys, shelve, subprocess
+from os.path import join
+
+PROJRELROOT = '../../'
+
+SCRIPTROOT = os.path.abspath(os.path.dirname("."))
+sys.path.append(os.path.abspath(PROJRELROOT))
+
+from config.projpaths import *
+from config.configuration import *
+
+# Convert address from python literal to numeric value
+def address_remove_literal(address):
+    value = hex(int(address, 16) - 0xf0000000)
+    if value[-1] in ['l', 'L']:
+        value = value[:-1]
+    return value
+
+ksym_header = \
+'''
+/*
+ * %s autogenerated from %s.
+ * by %s
+ * This file is included by the loader sources so that any
+ * kernel symbol address can be known in advance and stopped
+ * at by debuggers before virtual memory is enabled.
+ */
+'''
+
+assembler_symbol_definition = \
+'''
+.section .text
+.align 4
+.global %s
+.type %s, function
+.equ %s, %s
+'''
+
+def generate_ksym_to_loader(target_path, source_path):
+    symbols = ['break_virtual']
+    with open(target_path, 'w') as asmFile:
+        asmFile.write(ksym_header % (target_path, source_path, __name__))
+        for symbol in symbols:
+            process = subprocess.Popen('arm-none-eabi-objdump -d ' + source_path + ' | grep "<' + symbol + '>"', shell=True, stdout=subprocess.PIPE)
+            assert process.wait() == 0
+            address, name = process.stdout.read().split()
+            assert '<' + symbol + '>:' == name
+            asmFile.write( '''
+.section .text
+.align 4
+.global %s
+.type %s, function
+.equ %s, %s
+''' % (symbol, symbol, symbol, address_remove_literal(address)))
+
+if __name__ == "__main__":
+    generate_ksym_to_loader(join(PROJROOT, 'loader/ksyms.S'), join(BUILDDIR, 'kernel.elf'))