Add int and iret instruction definitions to the VM backend

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

src/libvm/src/inst.rs

@@ -46,6 +46,8 @@ instructions! {
     RET     = 0x2001,
     PUSH    = 0x2002,
     POP     = 0x2003,
+    INT     = 0x2004,
+    IRET    = 0x2005,
     MOV     = 0x3000,
     HALT    = 0xF000,
     NOP     = 0xF001,
@@ -77,6 +79,8 @@ pub enum Inst {
     Ret,
     Push(Source),
     Pop(Dest),
+    Int(Source, Source),
+    IRet,
     Mov(Dest, Source),
     Halt,
     Nop,
@@ -110,6 +114,8 @@ impl Inst {
             Inst::Ret => RET,
             Inst::Push(_) => PUSH,
             Inst::Pop(_) => POP,
+            Inst::Int(_, _) => INT,
+            Inst::IRet => IRET,
             Inst::Halt => HALT,
             Inst::Nop => NOP,
             Inst::Dump => DUMP,
@@ -134,7 +140,8 @@ impl Inst {
                 | Inst::Not(dest, source)
                 | Inst::Mov(dest, source) => { 3 + dest.len() + source.len() }
             Inst::CmpEq(s1, s2)
-                | Inst::CmpLt(s1, s2) => { 3 + s1.len() + s2.len() }
+                | Inst::CmpLt(s1, s2)
+                | Inst::Int(s1, s2) => { 3 + s1.len() + s2.len() }
             Inst::Jmp(v)
                 | Inst::Jz(v)
                 | Inst::Jnz(v)
@@ -144,7 +151,8 @@ impl Inst {
             Inst::Ret
                 | Inst::Halt
                 | Inst::Nop
-                | Inst::Dump => { 2 }
+                | Inst::Dump
+                | Inst::IRet => { 2 }
         }
     }
 }

src/libvm/src/mem.rs

@@ -121,6 +121,8 @@ impl<T> MemCursor<T>
             RET => Ok(Inst::Ret),
             PUSH => source!(Push),
             POP => dest!(Pop),
+            INT => { todo!("INT decode") },
+            IRET => { todo!("IRET decode") },
             MOV => dest_source!(Mov),
             HALT => Ok(Inst::Halt),
             NOP => Ok(Inst::Nop),

src/libvm/src/state.rs

@@ -356,6 +356,16 @@ impl State {
             Inst::Pop(d) => {
                 self.pop(d)?;
             }
+            Inst::Int(v, a) => {
+                let vector = self.load_source(v)?;
+                let aux = self.load_source(a)?;
+                // this method immediately jumps, so don't let the next_ip be set below
+                return self.interrupt(next_ip, vector as usize, aux);
+            }
+            Inst::IRet => {
+                // this method immediately jumps, so don't let the next_ip be set below
+                return self.exit_interrupt();
+            }
             Inst::Mov(d, s) => {
                 let value = self.load_source(s)?;
                 self.store_dest(d, value)?;