Merge pull request #1 from virtual-labs/dev

Dev

experiment-descriptor.json

@@ -0,0 +1,39 @@
+{
+  "unit-type": "lu",
+  "label": "",
+  "basedir": ".",
+  "units": [
+    {
+      "unit-type": "aim"
+    },
+    {
+      "target": "theory.html",
+      "source": "theory.md",
+      "label": "Theory",
+      "unit-type": "task",
+      "content-type": "text"
+    },
+    {
+      "target": "procedure.html",
+      "source": "procedure.md",
+      "label": "Procedure",
+      "unit-type": "task",
+      "content-type": "text"
+    },
+    {
+      "target": "simulation.html",
+      "source": "simulation/index.html",
+      "label": "Simulation",
+      "unit-type": "task",
+      "content-type": "simulation"
+    },
+    {
+      "target": "references.html",
+      "source": "references.md",
+      "label": "References",
+      "unit-type": "task",
+      "content-type": "text"
+    }
+  ]
+}
+

experiment/aim.md

@@ -1 +1 @@
-### Aim of the experiment
+Procedures allows a user to define his/her own operation to act upon primitive or user defined data types. Further it allows modular development of programs enabling software readability, maintainability and efficiency also.

experiment/experiment-name.md

@@ -1 +1 @@
-## Experiment name
+## Implementing Procedures using ARM ISA

experiment/objective.md

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+The following are the objectives of this series of assignments.  
+
+1. Learn Parameter and Return Value passing mechanism  
+2. Using stack to pass parameters and store other state information.  
+3. Know the distinction between a leaf and non-lead procedure.  

experiment/procedure.md

@@ -1 +1,2 @@
-### Procedure
+Procedure is explained in the Simulation.
+

experiment/references.md

@@ -1 +1 @@
-### Link your references in here
+- Patterson, D. A. and Hennessy, J. L.  Computer Organization and Design: the Hardware/Software Interface. ARM Edition.

experiment/theory.md

@@ -1 +1,7 @@
-### Link your theory in here
+To implement procedure abstraction we need to address the following questions:  
+
+- How to pass parameters?  
+- How to return values?  
+- How to call the procedure and return back to the calling procedure?  
+
+We can use the registers to pass parameters and return values back and forth between the caller and callee procedures. ARM provides the Branch and Link (BL) Instruction to call procedures. Unlike x86 architecture the return address is not stored on the stack, it is stored in the link register, R14. Code examples are given as a part of the simulator itself.