diff --git a/llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp b/llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
--- a/llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
+++ b/llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
@@ -57,6 +57,8 @@
   setOperationAction(ISD::FP_TO_SINT, GRLenVT, Custom);
   setOperationAction(ISD::ROTL, GRLenVT, Expand);
   setOperationAction(ISD::CTPOP, GRLenVT, Expand);
+  setOperationAction(ISD::DEBUGTRAP, MVT::Other, Legal);
+  setOperationAction(ISD::TRAP, MVT::Other, Legal);
 
   setOperationAction({ISD::GlobalAddress, ISD::ConstantPool}, GRLenVT, Custom);
 
diff --git a/llvm/lib/Target/LoongArch/LoongArchInstrInfo.td b/llvm/lib/Target/LoongArch/LoongArchInstrInfo.td
--- a/llvm/lib/Target/LoongArch/LoongArchInstrInfo.td
+++ b/llvm/lib/Target/LoongArch/LoongArchInstrInfo.td
@@ -741,6 +741,17 @@
 def : Pat<(or GPR:$rj, (not GPR:$rk)), (ORN GPR:$rj, GPR:$rk)>;
 def : Pat<(and GPR:$rj, (not GPR:$rk)), (ANDN GPR:$rj, GPR:$rk)>;
 
+/// Traps
+
+// We lower `trap` to `break 0` as this is guaranteed to exist and work, even
+// for LA32 Primary.
+def : Pat<(trap), (BREAK 0)>;
+
+// We lower `debugtrap` also to `break 0` because so far the ISA does not
+// provide a specific trap instruction/kind for specifically alerting the
+// debugger.
+def : Pat<(debugtrap), (BREAK 0)>;
+
 /// Bit counting operations
 
 let Predicates = [IsLA64] in {
diff --git a/llvm/test/CodeGen/LoongArch/trap.ll b/llvm/test/CodeGen/LoongArch/trap.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/CodeGen/LoongArch/trap.ll
@@ -0,0 +1,38 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc --mtriple=loongarch32 --verify-machineinstrs < %s \
+; RUN:   | FileCheck --check-prefix=LA32 %s
+; RUN: llc --mtriple=loongarch64 --verify-machineinstrs < %s \
+; RUN:   | FileCheck --check-prefix=LA64 %s
+
+;; Verify that we lower @llvm.trap() and @llvm.debugtrap() correctly.
+
+declare void @llvm.trap()
+declare void @llvm.debugtrap()
+
+define void @test_trap() nounwind {
+; LA32-LABEL: test_trap:
+; LA32:       # %bb.0:
+; LA32-NEXT:    break 0
+; LA32-NEXT:    ret
+;
+; LA64-LABEL: test_trap:
+; LA64:       # %bb.0:
+; LA64-NEXT:    break 0
+; LA64-NEXT:    ret
+  tail call void @llvm.trap()
+  ret void
+}
+
+define void @test_debugtrap() nounwind {
+; LA32-LABEL: test_debugtrap:
+; LA32:       # %bb.0:
+; LA32-NEXT:    break 0
+; LA32-NEXT:    ret
+;
+; LA64-LABEL: test_debugtrap:
+; LA64:       # %bb.0:
+; LA64-NEXT:    break 0
+; LA64-NEXT:    ret
+  tail call void @llvm.debugtrap()
+  ret void
+}