This patch from Shenghou Ma fixes gccgo on libgo by not losing the TLS
pointer. This works around what I would describe as a bug in the NetBSD
libc. Bootstrapped on x86_64-unknown-linux-gnu, not that that proves
much. Committed to mainline.
Ian
diff -r df61836f495f libgo/runtime/proc.c
--- a/libgo/runtime/proc.c Mon Nov 05 09:36:01 2012 -0800
+++ b/libgo/runtime/proc.c Mon Nov 05 09:37:21 2012 -0800
@@ -82,7 +82,7 @@
{
}
-# else
+#else
# if defined(__x86_64__) && defined(__sun__)
@@ -110,6 +110,28 @@
c->uc_mcontext.gregs[REG_FSBASE] = fs;
}
+# elif defined(__NetBSD__)
+
+// NetBSD has a bug: setcontext clobbers tlsbase, we need to save
+// and restore it ourselves.
+
+static __thread __greg_t tlsbase;
+
+static inline void
+initcontext(void)
+{
+ ucontext_t c;
+
+ getcontext(&c);
+ tlsbase = c.uc_mcontext._mc_tlsbase;
+}
+
+static inline void
+fixcontext(ucontext_t* c)
+{
+ c->uc_mcontext._mc_tlsbase = tlsbase;
+}
+
# else
# error unknown case for SETCONTEXT_CLOBBERS_TLS
