runtime: move sigprofNonGo

The sigprofNonGo and sigprofNonGoPC functions are only used on unix-like
platforms. In preparation for unix-specific changes to sigprofNonGo,
move it (plus its close relative) to a unix-specific file.

Updates #35057

Change-Id: I9c814127c58612ea9a9fbd28a992b04ace5c604d
Reviewed-on: https://go-review.googlesource.com/c/go/+/351790
Run-TryBot: Rhys Hiltner <[email protected]>
TryBot-Result: Go Bot <[email protected]>
Reviewed-by: Ian Lance Taylor <[email protected]>
Reviewed-by: Michael Pratt <[email protected]>
Trust: David Chase <[email protected]>

Author: rhysh

src/runtime/proc.go

@@ -4705,45 +4705,6 @@ func sigprof(pc, sp, lr uintptr, gp *g, mp *m) {
 	getg().m.mallocing--
 }
 
-// If the signal handler receives a SIGPROF signal on a non-Go thread,
-// it tries to collect a traceback into sigprofCallers.
-// sigprofCallersUse is set to non-zero while sigprofCallers holds a traceback.
-var sigprofCallers cgoCallers
-var sigprofCallersUse uint32
-
-// sigprofNonGo is called if we receive a SIGPROF signal on a non-Go thread,
-// and the signal handler collected a stack trace in sigprofCallers.
-// When this is called, sigprofCallersUse will be non-zero.
-// g is nil, and what we can do is very limited.
-//go:nosplit
-//go:nowritebarrierrec
-func sigprofNonGo() {
-	if prof.hz != 0 {
-		n := 0
-		for n < len(sigprofCallers) && sigprofCallers[n] != 0 {
-			n++
-		}
-		cpuprof.addNonGo(sigprofCallers[:n])
-	}
-
-	atomic.Store(&sigprofCallersUse, 0)
-}
-
-// sigprofNonGoPC is called when a profiling signal arrived on a
-// non-Go thread and we have a single PC value, not a stack trace.
-// g is nil, and what we can do is very limited.
-//go:nosplit
-//go:nowritebarrierrec
-func sigprofNonGoPC(pc uintptr) {
-	if prof.hz != 0 {
-		stk := []uintptr{
-			pc,
-			abi.FuncPCABIInternal(_ExternalCode) + sys.PCQuantum,
-		}
-		cpuprof.addNonGo(stk)
-	}
-}
-
 // setcpuprofilerate sets the CPU profiling rate to hz times per second.
 // If hz <= 0, setcpuprofilerate turns off CPU profiling.
 func setcpuprofilerate(hz int32) {

src/runtime/signal_unix.go

@@ -10,6 +10,7 @@ package runtime
 import (
 	"internal/abi"
 	"runtime/internal/atomic"
+	"runtime/internal/sys"
 	"unsafe"
 )
 
@@ -469,6 +470,45 @@ func sigtrampgo(sig uint32, info *siginfo, ctx unsafe.Pointer) {
 	}
 }
 
+// If the signal handler receives a SIGPROF signal on a non-Go thread,
+// it tries to collect a traceback into sigprofCallers.
+// sigprofCallersUse is set to non-zero while sigprofCallers holds a traceback.
+var sigprofCallers cgoCallers
+var sigprofCallersUse uint32
+
+// sigprofNonGo is called if we receive a SIGPROF signal on a non-Go thread,
+// and the signal handler collected a stack trace in sigprofCallers.
+// When this is called, sigprofCallersUse will be non-zero.
+// g is nil, and what we can do is very limited.
+//go:nosplit
+//go:nowritebarrierrec
+func sigprofNonGo() {
+	if prof.hz != 0 {
+		n := 0
+		for n < len(sigprofCallers) && sigprofCallers[n] != 0 {
+			n++
+		}
+		cpuprof.addNonGo(sigprofCallers[:n])
+	}
+
+	atomic.Store(&sigprofCallersUse, 0)
+}
+
+// sigprofNonGoPC is called when a profiling signal arrived on a
+// non-Go thread and we have a single PC value, not a stack trace.
+// g is nil, and what we can do is very limited.
+//go:nosplit
+//go:nowritebarrierrec
+func sigprofNonGoPC(pc uintptr) {
+	if prof.hz != 0 {
+		stk := []uintptr{
+			pc,
+			abi.FuncPCABIInternal(_ExternalCode) + sys.PCQuantum,
+		}
+		cpuprof.addNonGo(stk)
+	}
+}
+
 // adjustSignalStack adjusts the current stack guard based on the
 // stack pointer that is actually in use while handling a signal.
 // We do this in case some non-Go code called sigaltstack.