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changeset 17:9bbdf7258cd8

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Second pass now properly pads addresses
author james <jb302@eecs.qmul.ac.uk>
date Thu, 30 Jan 2014 17:09:55 +0000
parents 50dd22c1ccba
children 256d24488e3f
files assembler/assembler.py tests/ljmp.asm tests/test.bin
diffstat 3 files changed, 13 insertions(+), 2 deletions(-) [+]
line wrap: on
line diff
--- a/assembler/assembler.py	Thu Jan 30 15:27:02 2014 +0000
+++ b/assembler/assembler.py	Thu Jan 30 17:09:55 2014 +0000
@@ -91,15 +91,19 @@
         # assemble to file
         # need to make sure 16 bit arguments are padded
         f.seek(pc)
+        op, width = iset[mne][sym]
         try:
-            f.write(struct.pack('>B', iset[mne][sym][0]))
+            f.write(struct.pack('>B', op))
+            # pad if needed
+            for i in range(width - len(const) - 1):
+                f.write(struct.pack('>B', 0))
             f.write(const)
         except:
             # will raise a symbol error when any unrecognised
             # mnemonic or argument format is found
             print 'syntax error: %s %s' % (mne, sym)
             return 'symbol_error'
-        pc = pc + len(const) + 1
+        pc = pc + width
         
     f.seek(0)    
     return f
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/ljmp.asm	Thu Jan 30 17:09:55 2014 +0000
@@ -0,0 +1,7 @@
+LJMP label
+CLR C
+label:
+SET C
+label2:
+SJMP label2
+
Binary file tests/test.bin has changed