OpenBSD/power support.
diff --git a/src/libthread/OpenBSD-power.c b/src/libthread/OpenBSD-power.c
new file mode 100644
index 0000000..c3c7e72
--- /dev/null
+++ b/src/libthread/OpenBSD-power.c
@@ -0,0 +1,38 @@
+#include "threadimpl.h"
+
+void
+makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
+{
+ ulong *sp, *tos;
+ va_list arg;
+
+ tos = (ulong*)ucp->uc_stack.ss_sp+ucp->uc_stack.ss_size/sizeof(ulong);
+ sp = (ulong*)((ulong)(tos-16) & ~15);
+ ucp->mc.pc = (long)func;
+ ucp->mc.sp = (long)sp;
+ va_start(arg, argc);
+ ucp->mc.r3 = va_arg(arg, long);
+ va_end(arg);
+}
+
+int
+getcontext(ucontext_t *uc)
+{
+ return _getmcontext(&uc->mc);
+}
+
+int
+setcontext(ucontext_t *uc)
+{
+ _setmcontext(&uc->mc);
+ return 0;
+}
+
+int
+swapcontext(ucontext_t *oucp, ucontext_t *ucp)
+{
+ if(getcontext(oucp) == 0)
+ setcontext(ucp);
+ return 0;
+}
+
