Fwd: eXpOS bug fixes and new features

[Murali Krishnan]

Dear Fariz, Nihil,

  Could you please have a look at the updates made by Farseen.

Murali

---------- Forwarded message ---------
From: Muhammed Farseeen CK <farseen_...@nitc.ac.in>
Date: Fri, Aug 23, 2019 at 5:33 PM
Subject: eXpOS bug fixes and new features
To: Murali Krishnan <kmu...@nitc.ac.in>

Respected sir,

My name is Farseen. I am from CSE 3rd year A Batch.

I have fixed a few bugs and added a few options to xfs-interface, xsm and expl.

I would like to have your feedback on those changes.

I have submitted them as pull requests on github.

Could you please look into them?

Bug fixes:

1) Expl - Label translation program treats "num:" in MOV R0, "num:" as label.

Fixed by modifying lex rules.

https://github.com/eXpOSNitc/expl/pull/1

2) XFS Interface - Label resolving during loading exception handler, etc produces incorrect addresses if a line has more than 33 chars.

Fixed by making the line buffer of labels phase one function larger.

https://github.com/eXpOSNitc/xfs-interface/pull/3

Extra options:

Allowed specifying which disk.xfs file to use in xsm and xfs-interface. This allowed me to effectively organize my progress through the lab as I have done here:

https://gitlab.com/farzeen-btech-nitc/cs3092d_os_lab

https://gitlab.com/farzeen-btech-nitc/cs3092d_os_lab/blob/master/files/stage15/run.bash

It allows me to make the folder for a particular stage or a particular assignment very self contained.

The disk.xfs is specified using --disk-file parameter. If it is not used, it falls back to the previously hardcoded value we are already using. So it is backwards compatible.

https://github.com/eXpOSNitc/xfs-interface/pull/2

https://github.com/eXpOSNitc/xsm/pull/3

I also have a few more changes that I would like to add.

One is allowing proper comments in xsm files. Currently comments on a line of its own are not handled correctly. But this would require a bit more refactoring to do this in a maintainable way. I would only be able to do this with your guidance.

Sincerely

Farseen,

A Batch, S5 CSE

[Nikhil Sojan]

Sir, 

We will check it latest by Monday. 

Nikhil. 

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