refresh 6

tools/patch_libmalloc.py

@@ -0,0 +1,58 @@
+#!/usr/bin/env python
+#
+# Patches the malloc() function in libmalloc.so to allocate more than the
+# specified number of bytes. This is needed to work around issues with the
+# compiler occasionally crashing.
+#
+# This script replaces the "move a1, a0" (00 80 28 25) instruction with
+# "addiu a1, a0, n" (24 85 nn nn), which causes the malloc function to add n to
+# the size parameter that was passed in.
+
+import hashlib
+import os.path
+import sys
+
+# file to patch
+filename = 'tools/ido5.3_compiler/lib/libmalloc.so'
+# Expected (unpatched) hash of file
+filehash = 'adde672b5d79b52ca3cce9a47c7cb648'
+# location in file to patch
+address = 0xAB4
+
+# Get parameter
+if len(sys.argv) != 2:
+    print('Usage: ' + sys.argv[0] + ' n\n    where n is the number of extra bytes to allocate in malloc()')
+    exit(1)
+n = int(sys.argv[1])
+
+# Original instruction "move a1, a0"
+oldinsn = bytearray([0x00, 0x80, 0x28, 0x25])
+
+# New instruction "addiu a1, a0, n"
+newinsn = bytearray([0x24, 0x85, (n >> 8) & 0xFF, (n & 0xFF)])
+
+# Patch the file
+try:
+    with open(filename, 'rb+') as f:
+        # Read file contents
+        contents = bytearray(f.read())
+
+        # Unpatch the file by restoring original instruction
+        contents[address:address+4] = oldinsn
+
+        # Verify the (unpatched) hash of the file
+        md5 = hashlib.md5()
+        md5.update(contents)
+        if md5.hexdigest() != filehash:
+            print('Error: ' + filename + ' does not appear to be the correct version.')
+            exit(1)
+
+        # Patch the file
+        if n != 0:
+            contents[address:address+4] = newinsn
+
+        # Write file
+        f.seek(0, os.SEEK_SET)
+        f.write(contents)
+except IOError as e:
+    print('Error: Could not open library file for writing: ' + str(e))