From edb393420ca8bde289e1d51340715803c7641a5b Mon Sep 17 00:00:00 2001
From: Andreas Schwab <schwab@linux-m68k.org>
Date: Tue, 23 Feb 2010 00:18:51 +0100
Subject: [PATCH] Fix reporting signal mask by sigreturn on powerpc

* signal.c (sys_sigreturn) [POWERPC]: Skip dummy stack frame when
locating signal context.
---
 signal.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/signal.c b/signal.c
index c1d6eb07..bf97e900 100644
--- a/signal.c
+++ b/signal.c
@@ -1329,6 +1329,12 @@ sys_sigreturn(struct tcb *tcp)
 		tcp->u_arg[0] = 0;
 		if (upeek(tcp, sizeof(unsigned long)*PT_R1, &esp) < 0)
 			return 0;
+		/* Skip dummy stack frame. */
+#ifdef __powerpc64__
+		esp += 128;
+#else
+		esp += 64;
+#endif
 		if (umove(tcp, esp, &sc) < 0)
 			return 0;
 		tcp->u_arg[0] = 1;
-- 
2.40.0