diff --git a/nimbus/vm/interpreter/opcodes_impl.nim b/nimbus/vm/interpreter/opcodes_impl.nim
index eb7442271..108722cb3 100644
--- a/nimbus/vm/interpreter/opcodes_impl.nim
+++ b/nimbus/vm/interpreter/opcodes_impl.nim
@@ -560,6 +560,7 @@ op jumpSub, inline = true, jumpTarget:
   if jumpTarget >= c.code.len.u256:
     raise newException(InvalidJumpDestination, "JumpSub destination exceeds code len")
 
+  let returnPC = c.code.pc
   let jt = jumpTarget.truncate(int)
   c.code.pc = jt
 
@@ -570,7 +571,7 @@ op jumpSub, inline = true, jumpTarget:
   if c.returnStack.len == 1023:
     raise newException(FullStack, "Out of returnStack")
 
-  push: jt + 1
+  c.returnStack.push returnPC
   inc c.code.pc
 
 # ##########################################
diff --git a/tests/macro_assembler.nim b/tests/macro_assembler.nim
index d6f3180bb..38dc0fe3d 100644
--- a/tests/macro_assembler.nim
+++ b/tests/macro_assembler.nim
@@ -172,6 +172,10 @@ proc parseFork(fork: NimNode): Fork =
   fork[0].expectKind({nnkIdent, nnkStrLit})
   parseEnum[Fork](strip(fork[0].strVal))
 
+proc parseGasUsed(gas: NimNode): GasInt =
+  gas[0].expectKind(nnkIntLit)
+  result = gas[0].intVal
+
 proc generateVMProxy(boa: Assembler): NimNode =
   let
     vmProxy = genSym(nskProc, "vmProxy")
@@ -262,10 +266,9 @@ proc initComputation(blockNumber: Uint256, chainDB: BaseChainDB, code, data: seq
 proc runVM*(blockNumber: Uint256, chainDB: BaseChainDB, boa: Assembler): bool =
   var computation = initComputation(blockNumber, chainDB, boa.code, boa.data, boa.fork)
 
-  # TODO: support gas comsumption validation
-  # let gas = computation.gasMeter.gasRemaining
+  let gas = computation.gasMeter.gasRemaining
   execComputation(computation)
-  # let gasUsed = gas - computation.gasMeter.gasRemaining
+  let gasUsed = gas - computation.gasMeter.gasRemaining
 
   if computation.isSuccess:
     if boa.success == false:
@@ -276,6 +279,11 @@ proc runVM*(blockNumber: Uint256, chainDB: BaseChainDB, boa: Assembler): bool =
       error "different success value", expected=boa.success, actual=false
       return false
 
+  if boa.gasUsed != -1:
+    if boa.gasUsed != gasUsed:
+      error "different gasUsed", expected=boa.gasUsed, actual=gasUsed
+      return false
+
   if boa.stack.len != computation.stack.values.len:
     error "different stack len", expected=boa.stack.len, actual=computation.stack.values.len
     return false
@@ -355,7 +363,7 @@ proc runVM*(blockNumber: Uint256, chainDB: BaseChainDB, boa: Assembler): bool =
   result = true
 
 macro assembler*(list: untyped): untyped =
-  var boa = Assembler(success: true, fork: FkFrontier)
+  var boa = Assembler(success: true, fork: FkFrontier, gasUsed: -1)
   list.expectKind nnkStmtList
   for callSection in list:
     callSection.expectKind(nnkCall)
@@ -375,6 +383,7 @@ macro assembler*(list: untyped): untyped =
     of "data": boa.data = parseData(body)
     of "output": boa.output = parseData(body)
     of "fork": boa.fork = parseFork(body)
+    of "gasused": boa.gasUsed = parseGasUsed(body)
     else: error("unknown section '" & label & "'", callSection[0])
   result = boa.generateVMProxy()
 
diff --git a/tests/test_op_misc.nim b/tests/test_op_misc.nim
index 28c806059..0f65aecfe 100644
--- a/tests/test_op_misc.nim
+++ b/tests/test_op_misc.nim
@@ -175,3 +175,102 @@ proc opMiscMain*() =
       memory:
         "0xA0B0C0D0E0F0A1B1C1D1E1F1A2B2C2D2E2F2A3B3C3D3E3F3A4B4C4D4E4F4A1B1"
         "0x00"
+
+    assembler:
+      title: "Simple routine"
+      code:
+        PUSH1 "0x04"
+        JUMPSUB
+        STOP
+        BEGINSUB
+        RETURNSUB
+      gasUsed: 18
+      fork: Berlin
+
+    assembler:
+      title: "Two levels of subroutines"
+      code:
+        PUSH9 "0x00000000000000000C"
+        JUMPSUB
+        STOP
+        BEGINSUB
+        PUSH1 "0x11"
+        JUMPSUB
+        RETURNSUB
+        BEGINSUB
+        RETURNSUB
+      gasUsed: 36
+      fork: Berlin
+
+    assembler:
+      title: "Failure 1: invalid jump"
+      code:
+        PUSH9 "0x01000000000000000C"
+        JUMPSUB
+        STOP
+        BEGINSUB
+        PUSH1 "0x11"
+        JUMPSUB
+        RETURNSUB
+        BEGINSUB
+        RETURNSUB
+      success: false
+      fork: Berlin
+
+    assembler:
+      title: "Failure 2: shallow return stack"
+      code:
+        RETURNSUB
+        PC
+        PC
+      success: false
+      fork: Berlin
+
+    assembler:
+      title: "Subroutine at end of code"
+      code:
+        PUSH1 "0x05"
+        JUMP
+        BEGINSUB
+        RETURNSUB
+        JUMPDEST
+        PUSH1 "0x03"
+        JUMPSUB
+      gasUsed: 30
+      fork: Berlin
+
+    assembler:
+      title: "Error on 'walk-into-subroutine'"
+      code:
+        BEGINSUB
+        RETURNSUB
+        STOP
+      success: false
+      fork: Berlin
+
+    assembler:
+      title: "sol test"
+      code:
+        PUSH1 "0x02"
+        PUSH1 "0x03"
+        PUSH1 "0x08" # jumpdest
+        JUMPSUB
+        STOP
+
+        # 0x08
+        BEGINSUB
+        PUSH1 "0x0D" # jumpdest
+        JUMPSUB
+        RETURNSUB
+
+        # 0x0D
+        BEGINSUB
+        MUL
+        RETURNSUB
+      gasUsed: 47
+      fork: Berlin
+      stack:
+        "0x06"
+
+when isMainModule:
+  opMiscMain()