runtime: mark getfp as nosplit

When compiling with -l, we can't take a stack split here.

Fixes #76702

Change-Id: Ieab1225c6259c7f16bb5188aa84bff615d9db2e5
Reviewed-on: https://go-review.googlesource.com/c/go/+/728060
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Keith Randall <khr@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Keith Randall <khr@google.com>

src/runtime/os_wasm.go

@@ -142,6 +142,8 @@ func preemptM(mp *m) {
 
 // getfp returns the frame pointer register of its caller or 0 if not implemented.
 // TODO: Make this a compiler intrinsic
+//
+//go:nosplit
 func getfp() uintptr { return 0 }
 
 func setProcessCPUProfiler(hz int32) {}

src/runtime/stubs_386.go

@@ -21,4 +21,6 @@ func asmcgocall_no_g(fn, arg unsafe.Pointer)
 
 // getfp returns the frame pointer register of its caller or 0 if not implemented.
 // TODO: Make this a compiler intrinsic
+//
+//go:nosplit
 func getfp() uintptr { return 0 }

src/runtime/stubs_arm.go

@@ -26,4 +26,6 @@ func asmcgocall_no_g(fn, arg unsafe.Pointer)
 
 // getfp returns the frame pointer register of its caller or 0 if not implemented.
 // TODO: Make this a compiler intrinsic
+//
+//go:nosplit
 func getfp() uintptr { return 0 }

src/runtime/stubs_loong64.go

@@ -19,4 +19,6 @@ func unspillArgs()
 
 // getfp returns the frame pointer register of its caller or 0 if not implemented.
 // TODO: Make this a compiler intrinsic
+//
+//go:nosplit
 func getfp() uintptr { return 0 }

src/runtime/stubs_mips64x.go

@@ -17,4 +17,6 @@ func asmcgocall_no_g(fn, arg unsafe.Pointer)
 
 // getfp returns the frame pointer register of its caller or 0 if not implemented.
 // TODO: Make this a compiler intrinsic
+//
+//go:nosplit
 func getfp() uintptr { return 0 }

src/runtime/stubs_mipsx.go

@@ -12,4 +12,6 @@ func save_g()
 
 // getfp returns the frame pointer register of its caller or 0 if not implemented.
 // TODO: Make this a compiler intrinsic
+//
+//go:nosplit
 func getfp() uintptr { return 0 }

src/runtime/stubs_ppc64x.go

@@ -23,4 +23,6 @@ func unspillArgs()
 
 // getfp returns the frame pointer register of its caller or 0 if not implemented.
 // TODO: Make this a compiler intrinsic
+//
+//go:nosplit
 func getfp() uintptr { return 0 }

src/runtime/stubs_riscv64.go

@@ -22,4 +22,6 @@ func unspillArgs()
 
 // getfp returns the frame pointer register of its caller or 0 if not implemented.
 // TODO: Make this a compiler intrinsic
+//
+//go:nosplit
 func getfp() uintptr { return 0 }

src/runtime/stubs_s390x.go

@@ -17,4 +17,6 @@ func unspillArgs()
 
 // getfp returns the frame pointer register of its caller or 0 if not implemented.
 // TODO: Make this a compiler intrinsic
+//
+//go:nosplit
 func getfp() uintptr { return 0 }