Index: source/Plugins/ABI/SysV-i386/ABISysV_i386.cpp
===================================================================
--- source/Plugins/ABI/SysV-i386/ABISysV_i386.cpp
+++ source/Plugins/ABI/SysV-i386/ABISysV_i386.cpp
@@ -206,7 +206,7 @@
 ABISysV_i386::CreateInstance(const ArchSpec &arch) {
   static ABISP g_abi_sp;
   if ((arch.GetTriple().getArch() == llvm::Triple::x86) &&
-      arch.GetTriple().isOSLinux()) {
+      (arch.GetTriple().isOSLinux() || arch.GetTriple().isOSFreeBSD())) {
     if (!g_abi_sp)
       g_abi_sp.reset(new ABISysV_i386);
     return g_abi_sp;
Index: source/Plugins/Process/Utility/InferiorCallPOSIX.cpp
===================================================================
--- source/Plugins/Process/Utility/InferiorCallPOSIX.cpp
+++ source/Plugins/Process/Utility/InferiorCallPOSIX.cpp
@@ -89,7 +89,11 @@
             process->GetTarget().GetScratchClangASTContext();
         CompilerType clang_void_ptr_type =
             clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType();
-        lldb::addr_t args[] = {addr, length, prot_arg, flags_arg, fd, offset};
+        llvm::SmallVector<lldb::addr_t, 6> args({ addr, length, prot_arg,
+            flags_arg, fd, offset });
+        if (arch.GetTriple().getOS() == llvm::Triple::FreeBSD
+            && arch.GetTriple().getArch() == llvm::Triple::x86)
+          args.push_back(0);
         lldb::ThreadPlanSP call_plan_sp(
             new ThreadPlanCallFunction(*thread, mmap_range.GetBaseAddress(),
                                        clang_void_ptr_type, args, options));