diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/native/llvm/ContextUtils.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/native/llvm/ContextUtils.kt
index 133e20bdf8c..02c69f65a52 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/native/llvm/ContextUtils.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/native/llvm/ContextUtils.kt
@@ -49,7 +49,8 @@ internal interface ContextUtils {
             assert (this.kind.isReal)
             val globalName = this.symbolName
             val module = context.llvmModule
-            val functionType = LLVMFunctionType(LLVMVoidType(), null, 0, 0) // FIXME: use correct types
+
+            val functionType = getLlvmFunctionType(this)
             val function = LLVMGetNamedFunction(module, globalName) ?: LLVMAddFunction(module, globalName, functionType)
             return compileTimeValue(function)
         }
diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/native/llvm/DataLayout.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/native/llvm/DataLayout.kt
index a859f49f706..48082cca35f 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/native/llvm/DataLayout.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/native/llvm/DataLayout.kt
@@ -6,10 +6,12 @@ import org.jetbrains.kotlin.types.KotlinType
 
 internal fun getLLVMType(type: KotlinType): LLVMOpaqueType {
     return when {
-        KotlinBuiltIns.isBoolean(type) || KotlinBuiltIns.isByte(type) -> LLVMInt8Type()
+        KotlinBuiltIns.isBoolean(type) -> LLVMInt1Type()
+        KotlinBuiltIns.isByte(type) -> LLVMInt8Type()
         KotlinBuiltIns.isShort(type) || KotlinBuiltIns.isChar(type) -> LLVMInt16Type()
         KotlinBuiltIns.isInt(type) -> LLVMInt32Type()
         KotlinBuiltIns.isLong(type) -> LLVMInt64Type()
+        KotlinBuiltIns.isUnit(type) -> LLVMVoidType() // TODO: handle Unit parameter case
         !KotlinBuiltIns.isPrimitiveType(type) -> LLVMPointerType(LLVMInt8Type(), 0)
         else -> throw NotImplementedError()
     }!!
diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/native/llvm/LlvmUtils.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/native/llvm/LlvmUtils.kt
index c64179906fc..f3ab701e56b 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/native/llvm/LlvmUtils.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/native/llvm/LlvmUtils.kt
@@ -2,6 +2,8 @@ package org.jetbrains.kotlin.backend.native.llvm
 
 import kotlin_native.interop.mallocNativeArrayOf
 import llvm.*
+import org.jetbrains.kotlin.descriptors.FunctionDescriptor
+import org.jetbrains.kotlin.utils.singletonOrEmptyList
 
 /**
  * Represents the value which can be emitted as bitcode const value
@@ -55,4 +57,16 @@ internal fun compileTimeValue(value: LLVMOpaqueValue?) = object : CompileTimeVal
 
 internal val int32Type = LLVMInt32Type()
 
-internal fun pointerType(pointeeType: LLVMOpaqueType?) = LLVMPointerType(pointeeType, 0)
\ No newline at end of file
+internal fun pointerType(pointeeType: LLVMOpaqueType?) = LLVMPointerType(pointeeType, 0)
+
+internal fun getLlvmFunctionType(function: FunctionDescriptor): LLVMOpaqueType? {
+    val returnType = getLLVMType(function.returnType!!)
+    val params = function.dispatchReceiverParameter.singletonOrEmptyList() +
+                 function.extensionReceiverParameter.singletonOrEmptyList() +
+                 function.valueParameters
+
+    val paramTypes = params.map { getLLVMType(it.type) }.toTypedArray()
+
+    val paramTypesPtr = mallocNativeArrayOf(LLVMOpaqueType, *paramTypes)[0] // TODO: dispose
+    return LLVMFunctionType(returnType, paramTypesPtr, paramTypes.size, 0)
+}
\ No newline at end of file