Added the adr instruction

src/execution-engine-spec/instructions.adoc

@@ -32,11 +32,16 @@ include::instructions-operands-encoding.adoc[]
 
 |SVC
 |<<SVCINSTR>>
+
+|ADR
+|<<ADRINSTR>>
 |===
 <<<
 include::instructions/nop.adoc[]
 <<<
 include::instructions/svc.adoc[]
+<<<
+include::instructions/adr.adoc[]
 
 <<<
 ==== Memory-Related Instructions

src/execution-engine-spec/instructions/adr.adoc

@@ -0,0 +1,45 @@
+[id=ADRINSTR]
+===== ADR : Address from PC-relative offset
+[wavedrom, ,svg]
+....
+{reg: [
+  {bits: 7,  name: 0x1d, type: 8, attr: '0x1d'},
+  {bits: 4, name: 'off[3:0]', type: 5},
+  {bits: 5,  name: 'dst', type: 2},
+  {bits: 16,  name: 'off[19:4]', type: 5}
+], config: {label: {right: 'ADRI'}}}
+....
+
+Description::
+    Constructs an absolute address from a given *pc*-relative offset and stores it in a given register.
+    Sets the `dst` register to the value of `pc + off`.
+Encoding:: C-Type
+Assembler syntax::
++
+[source]
+----
+adr <dst>, <off>
+----
++
+Where:
+[horizontal]
+dst::: Destination register.
+off:::
+    Immediate offset.
+    Must be in the range -524288..524287.
+
+Examples::
++
+[source]
+----
+adr r0, -48    <1>
+adr r1, 0x1234 <2>
+----
+<1> Sets r0 to `pc - 48`.
+<2> Sets r1 to `pc + 0x1234`.
+
+Privileged instruction:: No.
+Updates program state flags:: No.
+Exceptions::
+    None.
+