diff --git a/src/cmd/compile/internal/ssa/gen/PPC64Ops.go b/src/cmd/compile/internal/ssa/gen/PPC64Ops.go
index b72563b53c..f6d072346d 100644
--- a/src/cmd/compile/internal/ssa/gen/PPC64Ops.go
+++ b/src/cmd/compile/internal/ssa/gen/PPC64Ops.go
@@ -447,6 +447,7 @@ func init() {
 			clobberFlags:   true,
 			typ:            "Mem",
 			faultOnNilArg0: true,
+			unsafePoint:    true,
 		},
 		// R31 is temp register
 		// Loop code:
@@ -493,6 +494,7 @@ func init() {
 			typ:            "Mem",
 			faultOnNilArg0: true,
 			faultOnNilArg1: true,
+			unsafePoint:    true,
 		},
 
 		{name: "LoweredAtomicStore8", argLength: 3, reg: gpstore, typ: "Mem", aux: "Int64", faultOnNilArg0: true, hasSideEffects: true},
diff --git a/src/cmd/compile/internal/ssa/opGen.go b/src/cmd/compile/internal/ssa/opGen.go
index b5b2c1d406..047a2a5573 100644
--- a/src/cmd/compile/internal/ssa/opGen.go
+++ b/src/cmd/compile/internal/ssa/opGen.go
@@ -24566,6 +24566,7 @@ var opcodeTable = [...]opInfo{
 		argLen:         2,
 		clobberFlags:   true,
 		faultOnNilArg0: true,
+		unsafePoint:    true,
 		reg: regInfo{
 			inputs: []inputInfo{
 				{0, 8}, // R3
@@ -24580,6 +24581,7 @@ var opcodeTable = [...]opInfo{
 		clobberFlags:   true,
 		faultOnNilArg0: true,
 		faultOnNilArg1: true,
+		unsafePoint:    true,
 		reg: regInfo{
 			inputs: []inputInfo{
 				{0, 8},  // R3
diff --git a/src/cmd/internal/obj/ppc64/obj9.go b/src/cmd/internal/obj/ppc64/obj9.go
index 2a4f005592..266c982549 100644
--- a/src/cmd/internal/obj/ppc64/obj9.go
+++ b/src/cmd/internal/obj/ppc64/obj9.go
@@ -702,6 +702,8 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
 					// Store link register before decrementing SP, so if a signal comes
 					// during the execution of the function prologue, the traceback
 					// code will not see a half-updated stack frame.
+					// This sequence is not async preemptible, as if we open a frame
+					// at the current SP, it will clobber the saved LR.
 					q = obj.Appendp(q, c.newprog)
 					q.As = AMOVD
 					q.Pos = p.Pos
@@ -710,6 +712,8 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
 					q.To.Type = obj.TYPE_REG
 					q.To.Reg = REG_R29 // REGTMP may be used to synthesize large offset in the next instruction
 
+					q = c.ctxt.StartUnsafePoint(q, c.newprog)
+
 					q = obj.Appendp(q, c.newprog)
 					q.As = AMOVD
 					q.Pos = p.Pos
@@ -727,6 +731,9 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
 					q.To.Type = obj.TYPE_REG
 					q.To.Reg = REGSP
 					q.Spadj = +autosize
+
+					q = c.ctxt.EndUnsafePoint(q, c.newprog, -1)
+
 				}
 			} else if c.cursym.Func.Text.Mark&LEAF == 0 {
 				// A very few functions that do not return to their caller