runtime: fix abort handling on Windows

On Windows, the IP recorded in the breakpoint exception caused by
runtime.abort is actually one byte after the INT3, unlike on UNIX
OSes. Account for this in isgoexception.

It turns out TestAbort was "passing" on Windows anyway because abort
still caused a fatal panic, just not the one we were expecting. This
CL tightens this test to check that the runtime specifically reports a
breakpoint exception.

Fixing this is related to #21382, since we use runtime.abort in
reporting g0 stack overflows, and it's important that we detect this
and not try to handle it.

Change-Id: I66120944d138eb80f839346b157a3759c1019e34
Reviewed-on: https://go-review.googlesource.com/122515
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>

src/runtime/crash_test.go

@@ -640,18 +640,21 @@ func TestTimePprof(t *testing.T) {
 
 // Test that runtime.abort does so.
 func TestAbort(t *testing.T) {
-	output := runTestProg(t, "testprog", "Abort")
+	// Pass GOTRACEBACK to ensure we get runtime frames.
+	output := runTestProg(t, "testprog", "Abort", "GOTRACEBACK=system")
 	if want := "runtime.abort"; !strings.Contains(output, want) {
 		t.Errorf("output does not contain %q:\n%s", want, output)
 	}
 	if strings.Contains(output, "BAD") {
 		t.Errorf("output contains BAD:\n%s", output)
 	}
-	// Check that it's a signal-style traceback.
-	if runtime.GOOS != "windows" {
-		if want := "PC="; !strings.Contains(output, want) {
-			t.Errorf("output does not contain %q:\n%s", want, output)
-		}
+	// Check that it's a breakpoint traceback.
+	want := "SIGTRAP"
+	if runtime.GOOS == "windows" {
+		want = "Exception 0x80000003"
+	}
+	if !strings.Contains(output, want) {
+		t.Errorf("output does not contain %q:\n%s", want, output)
 	}
 }
 

src/runtime/signal_windows.go

@@ -46,7 +46,9 @@ func isgoexception(info *exceptionrecord, r *context) bool {
 		return false
 	}
 
-	if isAbortPC(r.ip()) {
+	// In the case of an abort, the exception IP is one byte after
+	// the INT3 (this differs from UNIX OSes).
+	if isAbortPC(r.ip() - 1) {
 		// Never turn abort into a panic.
 		return false
 	}