Add address deref, syntax, and deref sizes

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

vm.md

@@ -228,7 +228,6 @@ the section contents.
 
 * 8 bits - Section kind
     * 0x00 - Data
-    * 0x10 - Code
     * 0xFF - Meta
 * 64 bits - Length of the section
 
@@ -239,15 +238,6 @@ The data section contains static data that is initialized to some known value.
 * 64 bits - section load start - where in memory the content of this section begins
 * 64 bits - section length - how long the memory content is
 
-### Code section
-
-The code section contains executable code.
-
-* 64 bits - section load start - where in memory the content of this section begins
-* 64 bits - section load end - where in memory the content of this section ends
-
-The remaining length of the section is the code itself.
-
 ### Meta section
 
 The meta section holds a table of metadata about the binary in a key-value format of strings mapping
@@ -273,3 +263,14 @@ A VM must provide support for the following meta-values:
 * Interrupts
 * MMIO regions
 * Paging?
+* Determine how address sizes are determined
+    * source size <= dest size - zero extend source and copy
+        * mov %r0, (label)u32
+    * source size > dest size - truncate to dest size
+        * mov (label)u32, %r0
+    * source size with unknown dest size - use dest size == source size
+        * mov %r0, (label)
+    * unknown source size with dest size - use dest size == source size
+        * mov (label), %r0
+    * unknown source size with unknown dest size - 64 bits
+        * mov (label), (%r0)