runtime: print error on receipt of signal on non-Go thread
It's the best we can do before Go 1.
For issue 3250; not a fix but at least less mysterious.
R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5797068
diff --git a/src/pkg/runtime/sys_freebsd_386.s b/src/pkg/runtime/sys_freebsd_386.s
index 683a564..a72d897 100644
--- a/src/pkg/runtime/sys_freebsd_386.s
+++ b/src/pkg/runtime/sys_freebsd_386.s
@@ -159,12 +159,17 @@
TEXT runtime·sigtramp(SB),7,$44
get_tls(CX)
+ // check that m exists
+ MOVL m(CX), BX
+ CMPL BX, $0
+ JNE 2(PC)
+ CALL runtime·badsignal(SB)
+
// save g
MOVL g(CX), DI
MOVL DI, 20(SP)
// g = m->gsignal
- MOVL m(CX), BX
MOVL m_gsignal(BX), BX
MOVL BX, g(CX)
