diff --git a/llvm/lib/Target/RISCV/RISCVISelLowering.h b/llvm/lib/Target/RISCV/RISCVISelLowering.h
--- a/llvm/lib/Target/RISCV/RISCVISelLowering.h
+++ b/llvm/lib/Target/RISCV/RISCVISelLowering.h
@@ -26,7 +26,6 @@
 enum NodeType : unsigned {
   FIRST_NUMBER = ISD::BUILTIN_OP_END,
   RET_FLAG,
-  URET_FLAG,
   SRET_FLAG,
   MRET_FLAG,
   CALL,
diff --git a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
--- a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
+++ b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
@@ -9077,7 +9077,7 @@
     StringRef Kind =
       MF.getFunction().getFnAttribute("interrupt").getValueAsString();
 
-    if (!(Kind == "user" || Kind == "supervisor" || Kind == "machine"))
+    if (!(Kind == "supervisor" || Kind == "machine"))
       report_fatal_error(
         "Function interrupt attribute argument not supported!");
   }
@@ -9694,9 +9694,7 @@
     StringRef Kind =
       MF.getFunction().getFnAttribute("interrupt").getValueAsString();
 
-    if (Kind == "user")
-      RetOpc = RISCVISD::URET_FLAG;
-    else if (Kind == "supervisor")
+    if (Kind == "supervisor")
       RetOpc = RISCVISD::SRET_FLAG;
     else
       RetOpc = RISCVISD::MRET_FLAG;
@@ -9731,7 +9729,6 @@
   case RISCVISD::FIRST_NUMBER:
     break;
   NODE_NAME_CASE(RET_FLAG)
-  NODE_NAME_CASE(URET_FLAG)
   NODE_NAME_CASE(SRET_FLAG)
   NODE_NAME_CASE(MRET_FLAG)
   NODE_NAME_CASE(CALL)
diff --git a/llvm/lib/Target/RISCV/RISCVInstrInfo.td b/llvm/lib/Target/RISCV/RISCVInstrInfo.td
--- a/llvm/lib/Target/RISCV/RISCVInstrInfo.td
+++ b/llvm/lib/Target/RISCV/RISCVInstrInfo.td
@@ -57,8 +57,6 @@
                               SDNPVariadic]>;
 def riscv_ret_flag  : SDNode<"RISCVISD::RET_FLAG", SDTNone,
                              [SDNPHasChain, SDNPOptInGlue, SDNPVariadic]>;
-def riscv_uret_flag : SDNode<"RISCVISD::URET_FLAG", SDTNone,
-                             [SDNPHasChain, SDNPOptInGlue]>;
 def riscv_sret_flag : SDNode<"RISCVISD::SRET_FLAG", SDTNone,
                              [SDNPHasChain, SDNPOptInGlue]>;
 def riscv_mret_flag : SDNode<"RISCVISD::MRET_FLAG", SDTNone,
@@ -659,12 +657,6 @@
 //===----------------------------------------------------------------------===//
 
 let isBarrier = 1, isReturn = 1, isTerminator = 1 in {
-def URET : Priv<"uret", 0b0000000>, Sched<[]> {
-  let rd = 0;
-  let rs1 = 0;
-  let rs2 = 0b00010;
-}
-
 def SRET : Priv<"sret", 0b0001000>, Sched<[]> {
   let rd = 0;
   let rs1 = 0;
@@ -1203,7 +1195,6 @@
 def : Pat<(riscv_call tglobaladdr:$func), (PseudoCALL tglobaladdr:$func)>;
 def : Pat<(riscv_call texternalsym:$func), (PseudoCALL texternalsym:$func)>;
 
-def : Pat<(riscv_uret_flag), (URET X0, X0)>;
 def : Pat<(riscv_sret_flag), (SRET X0, X0)>;
 def : Pat<(riscv_mret_flag), (MRET X0, X0)>;
 
diff --git a/llvm/lib/Target/RISCV/RISCVSystemOperands.td b/llvm/lib/Target/RISCV/RISCVSystemOperands.td
--- a/llvm/lib/Target/RISCV/RISCVSystemOperands.td
+++ b/llvm/lib/Target/RISCV/RISCVSystemOperands.td
@@ -70,23 +70,6 @@
 // 2.3, 2.4 and  2.5 in the RISC-V Instruction Set Manual
 // Volume II: Privileged Architecture.
 
-//===----------------------------------------------------------------------===//
-// User Trap Setup
-//===----------------------------------------------------------------------===//
-def : SysReg<"ustatus", 0x000>;
-def : SysReg<"uie", 0x004>;
-def : SysReg<"utvec", 0x005>;
-
-//===----------------------------------------------------------------------===//
-// User Trap Handling
-//===----------------------------------------------------------------------===//
-def : SysReg<"uscratch", 0x040>;
-def : SysReg<"uepc", 0x041>;
-def : SysReg<"ucause", 0x042>;
-let DeprecatedName = "ubadaddr" in
-def : SysReg<"utval", 0x043>;
-def : SysReg<"uip", 0x044>;
-
 //===----------------------------------------------------------------------===//
 // User Floating-Point CSRs
 //===----------------------------------------------------------------------===//
diff --git a/llvm/test/CodeGen/RISCV/interrupt-attr-args-error.ll b/llvm/test/CodeGen/RISCV/interrupt-attr-args-error.ll
--- a/llvm/test/CodeGen/RISCV/interrupt-attr-args-error.ll
+++ b/llvm/test/CodeGen/RISCV/interrupt-attr-args-error.ll
@@ -4,8 +4,8 @@
 ; RUN: 2>&1 | FileCheck %s
 
 ; CHECK: LLVM ERROR: Functions with the interrupt attribute cannot have arguments!
-define i32 @isr_user(i8 %n) #0 {
+define i32 @isr_supervisor(i8 %n) #0 {
   ret i32 0
 }
 
-attributes #0 = { "interrupt"="user" }
+attributes #0 = { "interrupt"="supervisor" }
diff --git a/llvm/test/CodeGen/RISCV/interrupt-attr-ret-error.ll b/llvm/test/CodeGen/RISCV/interrupt-attr-ret-error.ll
--- a/llvm/test/CodeGen/RISCV/interrupt-attr-ret-error.ll
+++ b/llvm/test/CodeGen/RISCV/interrupt-attr-ret-error.ll
@@ -4,9 +4,9 @@
 ; RUN: 2>&1 | FileCheck %s
 
 ; CHECK: LLVM ERROR: Functions with the interrupt attribute must have void return type!
-define i32 @isr1_user() #0 {
+define i32 @isr1_supervisor() #0 {
   ret i32 0
 }
 
 
-attributes #0 = { "interrupt"="user" }
+attributes #0 = { "interrupt"="supervisor" }
diff --git a/llvm/test/CodeGen/RISCV/interrupt-attr.ll b/llvm/test/CodeGen/RISCV/interrupt-attr.ll
--- a/llvm/test/CodeGen/RISCV/interrupt-attr.ll
+++ b/llvm/test/CodeGen/RISCV/interrupt-attr.ll
@@ -16,21 +16,15 @@
 ;
 ; Checking for special return instructions (uret, sret, mret).
 ;
-define void @foo_user() #0 {
-; CHECK-LABEL: foo_user:
-; CHECK:       # %bb.0:
-; CHECK-NEXT:    uret
-  ret void
-}
 
-define void @foo_supervisor() #1 {
+define void @foo_supervisor() #0 {
 ; CHECK-LABEL: foo_supervisor:
 ; CHECK:       # %bb.0:
 ; CHECK-NEXT:    sret
   ret void
 }
 
-define void @foo_machine() #2 {
+define void @foo_machine() #1 {
 ; CHECK-LABEL: foo_machine:
 ; CHECK:       # %bb.0:
 ; CHECK-NEXT:    mret
@@ -49,7 +43,7 @@
 ;
 
 declare i32 @otherfoo(...)
-define void @foo_with_call() #2 {
+define void @foo_with_call() #1 {
 ;
 ; CHECK-RV32-LABEL: foo_with_call:
 ; CHECK-RV32:       # %bb.0:
@@ -547,7 +541,7 @@
 ;
 ; Additionally check frame pointer and return address are properly saved.
 ;
-define void @foo_fp_with_call() #3 {
+define void @foo_fp_with_call() #2 {
 ;
 ; CHECK-RV32-LABEL: foo_fp_with_call:
 ; CHECK-RV32:       # %bb.0:
@@ -1060,7 +1054,6 @@
   ret void
 }
 
-attributes #0 = { nounwind "interrupt"="user" }
-attributes #1 = { nounwind "interrupt"="supervisor" }
-attributes #2 = { nounwind  "interrupt"="machine" }
-attributes #3 = { nounwind "interrupt"="machine" "frame-pointer"="all" }
+attributes #0 = { nounwind "interrupt"="supervisor" }
+attributes #1 = { nounwind "interrupt"="machine" }
+attributes #2 = { nounwind "interrupt"="machine" "frame-pointer"="all" }
diff --git a/llvm/test/CodeGen/RISCV/saverestore.ll b/llvm/test/CodeGen/RISCV/saverestore.ll
--- a/llvm/test/CodeGen/RISCV/saverestore.ll
+++ b/llvm/test/CodeGen/RISCV/saverestore.ll
@@ -298,33 +298,3 @@
   ret void
 }
 
-; Check that functions with interrupt attribute do not use save/restore code
-
-declare i32 @foo(...)
-define void @interrupt() nounwind "interrupt"="user" {
-; RV32I-LABEL: interrupt:
-; RV32I-NOT:     call t0, __riscv_save
-; RV32I-NOT:     tail __riscv_restore
-;
-; RV64I-LABEL: interrupt:
-; RV64I-NOT:     call t0, __riscv_save
-; RV64I-NOT:     tail __riscv_restore
-;
-; RV32I-SR-LABEL: interrupt:
-; RV32I-SR-NOT:     call t0, __riscv_save
-; RV32I-SR-NOT:     tail __riscv_restore
-;
-; RV64I-SR-LABEL: interrupt:
-; RV64I-SR-NOT:     call t0, __riscv_save
-; RV64I-SR-NOT:     tail __riscv_restore
-;
-; RV32I-FP-SR-LABEL: interrupt:
-; RV32I-FP-SR-NOT:     call t0, __riscv_save
-; RV32I-FP-SR-NOT:     tail __riscv_restore
-;
-; RV64I-FP-SR-LABEL: interrupt:
-; RV64I-FP-SR-NOT:     call t0, __riscv_save
-; RV64I-FP-SR-NOT:     tail __riscv_restore
-  %call = call i32 bitcast (i32 (...)* @foo to i32 ()*)()
-  ret void
-}
diff --git a/llvm/test/MC/RISCV/deprecated-csr-names.s b/llvm/test/MC/RISCV/deprecated-csr-names.s
--- a/llvm/test/MC/RISCV/deprecated-csr-names.s
+++ b/llvm/test/MC/RISCV/deprecated-csr-names.s
@@ -44,22 +44,6 @@
 
 # CHECK-WARN: warning: 'mbadaddr' is a deprecated alias for 'mtval'
 
-# ubadaddr
-# name
-# CHECK-INST: csrrw zero, utval, zero
-# CHECK-ENC: encoding: [0x73,0x10,0x30,0x04]
-# CHECK-INST-ALIAS: csrw utval, zero
-# uimm12
-# CHECK-INST: csrrw zero, utval, zero
-# CHECK-ENC: encoding: [0x73,0x10,0x30,0x04]
-# CHECK-INST-ALIAS: csrw utval, zero
-# name
-csrw ubadaddr, zero
-# uimm12
-csrrw zero, 0x043, zero
-
-# CHECK-WARN: warning: 'ubadaddr' is a deprecated alias for 'utval'
-
 # sptbr
 # name
 # CHECK-INST: csrrw zero, satp, zero
diff --git a/llvm/test/MC/RISCV/priv-valid.s b/llvm/test/MC/RISCV/priv-valid.s
--- a/llvm/test/MC/RISCV/priv-valid.s
+++ b/llvm/test/MC/RISCV/priv-valid.s
@@ -9,10 +9,6 @@
 # RUN:     | llvm-objdump -M no-aliases -d - \
 # RUN:     | FileCheck -check-prefix=CHECK-INST %s
 
-# CHECK-INST: uret
-# CHECK: encoding: [0x73,0x00,0x20,0x00]
-uret
-
 # CHECK-INST: sret
 # CHECK: encoding: [0x73,0x00,0x20,0x10]
 sret
diff --git a/llvm/test/MC/RISCV/rv32e-valid.s b/llvm/test/MC/RISCV/rv32e-valid.s
--- a/llvm/test/MC/RISCV/rv32e-valid.s
+++ b/llvm/test/MC/RISCV/rv32e-valid.s
@@ -111,10 +111,6 @@
 csrrs s0, 0xc00, x0
 # CHECK-ASM-AND-OBJ: csrrs s0, fflags, a5
 csrrs s0, 0x001, a5
-# CHECK-ASM-AND-OBJ: csrrc sp, ustatus, ra
-csrrc sp, 0x000, ra
-# CHECK-ASM-AND-OBJ: csrrwi a5, ustatus, 0
-csrrwi a5, 0x000, 0
 # CHECK-ASM-AND-OBJ: csrrsi t2, 4095, 31
 csrrsi t2, 0xfff, 31
 # CHECK-ASM-AND-OBJ: csrrci t1, sscratch, 5
diff --git a/llvm/test/MC/RISCV/rv32i-valid.s b/llvm/test/MC/RISCV/rv32i-valid.s
--- a/llvm/test/MC/RISCV/rv32i-valid.s
+++ b/llvm/test/MC/RISCV/rv32i-valid.s
@@ -361,12 +361,6 @@
 # CHECK-ASM-AND-OBJ: csrrs s3, fflags, s5
 # CHECK-ASM: encoding: [0xf3,0xa9,0x1a,0x00]
 csrrs s3, 0x001, s5
-# CHECK-ASM-AND-OBJ: csrrc sp, ustatus, ra
-# CHECK-ASM: encoding: [0x73,0xb1,0x00,0x00]
-csrrc sp, 0x000, ra
-# CHECK-ASM-AND-OBJ: csrrwi a5, ustatus, 0
-# CHECK-ASM: encoding: [0xf3,0x57,0x00,0x00]
-csrrwi a5, 0x000, 0
 # CHECK-ASM-AND-OBJ: csrrsi t2, 4095, 31
 # CHECK-ASM: encoding: [0xf3,0xe3,0xff,0xff]
 csrrsi t2, 0xfff, 31
diff --git a/llvm/test/MC/RISCV/user-csr-names.s b/llvm/test/MC/RISCV/user-csr-names.s
--- a/llvm/test/MC/RISCV/user-csr-names.s
+++ b/llvm/test/MC/RISCV/user-csr-names.s
@@ -10,125 +10,6 @@
 # RUN:     | llvm-objdump -d - \
 # RUN:     | FileCheck -check-prefix=CHECK-INST-ALIAS %s
 
-##################################
-# User Trap Setup
-##################################
-
-# ustatus
-# name
-# CHECK-INST: csrrs t1, ustatus, zero
-# CHECK-ENC:  encoding: [0x73,0x23,0x00,0x00]
-# CHECK-INST-ALIAS: csrr t1, ustatus
-# uimm12
-# CHECK-INST: csrrs t2, ustatus, zero
-# CHECK-ENC:  encoding: [0xf3,0x23,0x00,0x00]
-# CHECK-INST-ALIAS: csrr t2, ustatus
-csrrs t1, ustatus, zero
-# uimm12
-csrrs t2, 0x000, zero
-
-# uie
-# name
-# CHECK-INST: csrrs t1, uie, zero
-# CHECK-ENC:  encoding: [0x73,0x23,0x40,0x00]
-# CHECK-INST-ALIAS: csrr t1, uie
-# uimm12
-# CHECK-INST: csrrs t2, uie, zero
-# CHECK-ENC:  encoding: [0xf3,0x23,0x40,0x00]
-# CHECK-INST-ALIAS: csrr t2, uie
-# name
-csrrs t1, uie, zero
-# uimm12
-csrrs t2, 0x004, zero
-
-# utvec
-# name
-# CHECK-INST: csrrs t1, utvec, zero
-# CHECK-ENC:  encoding: [0x73,0x23,0x50,0x00]
-# CHECK-INST-ALIAS: csrr t1, utvec
-# uimm12
-# CHECK-INST: csrrs t2, utvec, zero
-# CHECK-ENC:  encoding: [0xf3,0x23,0x50,0x00]
-# CHECK-INST-ALIAS: csrr t2, utvec
-# name
-csrrs t1, utvec, zero
-# uimm12
-csrrs t2, 0x005, zero
-
-##################################
-# User Trap Handling
-##################################
-
-# uscratch
-# name
-# CHECK-INST: csrrs t1, uscratch, zero
-# CHECK-ENC:  encoding: [0x73,0x23,0x00,0x04]
-# CHECK-INST-ALIAS: csrr t1, uscratch
-# uimm12
-# CHECK-INST: csrrs t2, uscratch, zero
-# CHECK-ENC:  encoding: [0xf3,0x23,0x00,0x04]
-# CHECK-INST-ALIAS: csrr t2, uscratch
-# name
-csrrs t1, uscratch, zero
-# uimm12
-csrrs t2, 0x040, zero
-
-# uepc
-# name
-# CHECK-INST: csrrs t1, uepc, zero
-# CHECK-ENC:  encoding: [0x73,0x23,0x10,0x04]
-# CHECK-INST-ALIAS: csrr t1, uepc
-# uimm12
-# CHECK-INST: csrrs t2, uepc, zero
-# CHECK-ENC:  encoding: [0xf3,0x23,0x10,0x04]
-# CHECK-INST-ALIAS: csrr t2, uepc
-# name
-csrrs t1, uepc, zero
-# uimm12
-csrrs t2, 0x041, zero
-
-# ucause
-# name
-# CHECK-INST: csrrs t1, ucause, zero
-# CHECK-ENC:  encoding: [0x73,0x23,0x20,0x04]
-# CHECK-INST-ALIAS: csrr t1, ucause
-# uimm12
-# CHECK-INST: csrrs t2, ucause, zero
-# CHECK-ENC:  encoding: [0xf3,0x23,0x20,0x04]
-# CHECK-INST-ALIAS: csrr t2, ucause
-# name
-csrrs t1, ucause, zero
-# uimm12
-csrrs t2, 0x042, zero
-
-# utval
-# name
-# CHECK-INST: csrrs t1, utval, zero
-# CHECK-ENC:  encoding: [0x73,0x23,0x30,0x04]
-# CHECK-INST-ALIAS: csrr t1, utval
-# uimm12
-# CHECK-INST: csrrs t2, utval, zero
-# CHECK-ENC:  encoding: [0xf3,0x23,0x30,0x04]
-# CHECK-INST-ALIAS: csrr t2, utval
-# name
-csrrs t1, utval, zero
-# uimm12
-csrrs t2, 0x043, zero
-
-# uip
-# name
-# CHECK-INST: csrrs t1, uip, zero
-# CHECK-ENC:  encoding: [0x73,0x23,0x40,0x04]
-# CHECK-INST-ALIAS: csrr t1, uip
-# uimm12
-# CHECK-INST: csrrs t2, uip, zero
-# CHECK-ENC:  encoding: [0xf3,0x23,0x40,0x04]
-# CHECK-INST-ALIAS: csrr t2, uip
-#name
-csrrs t1, uip, zero
-# uimm12
-csrrs t2, 0x044, zero
-
 ##################################
 # User Floating Pont CSRs
 ##################################