From b551cb80d40e6fe0a21d73301bc373d01416ae7c Mon Sep 17 00:00:00 2001
From: Jake Burkholder <jake@FreeBSD.org>
Date: Fri, 8 Aug 2003 15:40:28 +0000
Subject: [PATCH] Implement signalcontext.

---
 lib/libc/sparc64/gen/Makefile.inc    |  4 +-
 lib/libc/sparc64/gen/signalcontext.c | 76 ++++++++++++++++++++++++++++
 2 files changed, 78 insertions(+), 2 deletions(-)
 create mode 100644 lib/libc/sparc64/gen/signalcontext.c

diff --git a/lib/libc/sparc64/gen/Makefile.inc b/lib/libc/sparc64/gen/Makefile.inc
index 85ecfbd5fcf9..265f3c048dbe 100644
--- a/lib/libc/sparc64/gen/Makefile.inc
+++ b/lib/libc/sparc64/gen/Makefile.inc
@@ -2,5 +2,5 @@
 
 SRCS+=	_ctx_start.S _setjmp.S fabs.S fixunsdfsi.S flt_rounds.c fpgetmask.c \
 	fpgetround.c fpgetsticky.c fpsetmask.c fpsetround.c fpsetsticky.c \
-	frexp.c infinity.c isinf.c ldexp.c makecontext.c modf.S setjmp.S \
-	sigsetjmp.S
+	frexp.c infinity.c isinf.c ldexp.c makecontext.c modf.S \
+	signalcontext.c setjmp.S sigsetjmp.S
diff --git a/lib/libc/sparc64/gen/signalcontext.c b/lib/libc/sparc64/gen/signalcontext.c
new file mode 100644
index 000000000000..f47e81ccd48b
--- /dev/null
+++ b/lib/libc/sparc64/gen/signalcontext.c
@@ -0,0 +1,76 @@
+/*-
+ * Copyright (c) 2003 Jake Burkholder.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/signal.h>
+#include <sys/ucontext.h>
+
+#include <machine/frame.h>
+#include <machine/sigframe.h>
+
+#include <errno.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+__weak_reference(__signalcontext, signalcontext);
+
+extern void _ctx_start(void);
+
+int
+__signalcontext(ucontext_t *ucp, int sig, __sighandler_t *func)
+{
+	struct sigframe *sfp;
+	struct frame *fp;
+	mcontext_t *mc;
+
+	mc = &ucp->uc_mcontext;
+	sfp = (struct sigframe *)(mc->mc_sp + SPOFF) - 1;
+	fp = (struct frame *)sfp - 1;
+
+	bzero(fp, sizeof(*fp));
+
+	bzero(sfp, sizeof(*sfp));
+	bcopy(ucp, &sfp->sf_uc, sizeof(*ucp));
+	sfp->sf_si.si_signo = sig;
+
+	mc->mc_global[1] = (uint64_t)func;
+	mc->mc_global[2] = (uint64_t)ucp;
+	mc->mc_out[0] = sig;
+	mc->mc_out[1] = (uint64_t)&sfp->sf_si;
+	mc->mc_out[2] = (uint64_t)&sfp->sf_uc;
+	mc->mc_out[6] = (uint64_t)fp - SPOFF;
+	mc->mc_tnpc = (uint64_t)_ctx_start + 4;
+	mc->mc_tpc = (uint64_t)_ctx_start;
+
+	ucp->uc_link = &sfp->sf_uc;
+	sigdelset(&ucp->uc_sigmask, sig);
+
+	return (0);
+}