From: Dmitry V. Levin <ldv@altlinux.org>
Date: Sun, 28 May 2017 17:13:29 +0000 (+0000)
Subject: sparc: enhance decoding of signal number argument of sigaction syscall
X-Git-Tag: v4.18~147
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=5f27295dfd1c6ee40c477dafc3f79cc22c01200e;p=strace

sparc: enhance decoding of signal number argument of sigaction syscall

On sparc, unlike all other architectures, old sigaction syscall takes
a negated signal number.

* signal.c (SYS_FUNC(sigaction)) [SPARC || SPARC64]: Enhance printing
of negative signal number argument.
---

diff --git a/signal.c b/signal.c
index 2e90bd03..79054c70 100644
--- a/signal.c
+++ b/signal.c
@@ -365,7 +365,14 @@ decode_old_sigaction(struct tcb *const tcp, const kernel_ulong_t addr)
 SYS_FUNC(sigaction)
 {
 	if (entering(tcp)) {
-		printsignal(tcp->u_arg[0]);
+		int signo = tcp->u_arg[0];
+#if defined SPARC || defined SPARC64
+		if (signo < 0) {
+			tprints("-");
+			signo = -signo;
+		}
+#endif
+		printsignal(signo);
 		tprints(", ");
 		decode_old_sigaction(tcp, tcp->u_arg[1]);
 		tprints(", ");