- some helpers for building userland code. Very hacky at the moment but

should work until something better comes along.

tools/as

@@ -0,0 +1,11 @@
+#!/bin/sh
+#
+# use the v7 assembler to assemble some userland code into an 0405 binary.
+# Requires the first .s file to set ". = . + 40014".
+#
+
+. tools/assemv7.cfg
+export APOUT_ROOT
+$APOUT $APOUT_ROOT/bin/as "$@" && tools/fixaout.py
+
+

tools/fixaout.py

@@ -0,0 +1,41 @@
+#!/usr/bin/env python
+"""
+Convert an 0407 binary into an 0405 binary, under the assumption
+that the code starts at 040014 (by ". = . + 40014").
+See tools/as.
+"""
+
+import struct
+
+def words(bs) :
+    l = len(bs) / 2
+    return list(struct.unpack('<%dH' % l, bs))
+def unwords(ws) :
+    l = len(ws)
+    return struct.pack('<%dH' % l, *ws)
+
+def read(fn) :
+    f = file(fn, 'rb')
+    d = f.read()
+    f.close()
+    return d
+
+def write(fn, d) :
+    f = file(fn, 'wb')
+    f.write(d)
+    f.close()
+
+orig = 040000
+d = words(read('a.out'))
+hdr = d[:8]
+d = d[8 + orig/2 :]
+
+d[0] = 0405
+d[1] = hdr[1] - orig
+d[2] = 0
+d[3] = 0
+d[4] = hdr[4]
+d[5] = 0
+d = d[:d[1] / 2]
+
+write("b.out", unwords(d))