Add libc side of user trap handling.

Add support for handling floating point disabled traps mostly in userland
for the simple single threaded case.  Not yet enabled by default.
Implement __sparc_utrap_install as specified by the sparc abi.

1 files changed, 53 insertions, 0 deletions

diff --git a/lib/libc/sparc64/sys/__sparc_utrap_private.h b/lib/libc/sparc64/sys/__sparc_utrap_private.h
new file mode 100644
index 000000000000..59461348a6d4
--- /dev/null
+++ b/lib/libc/sparc64/sys/__sparc_utrap_private.h
@@ -0,0 +1,53 @@
+/*-
+ * Copyright (c) 2001 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef	___SPARC_UTRAP_PRIVATE_H_
+#define	___SPARC_UTRAP_PRIVATE_H_
+
+#define	UF_DONE(uf) do {						\
+	uf->uf_pc = uf->uf_npc;						\
+	uf->uf_npc = uf->uf_pc + 4;					\
+} while (0)
+
+struct utrapframe {
+	u_long	uf_global[8];
+	u_long	uf_out[8];
+	u_long	uf_pc;
+	u_long	uf_npc;
+	u_long	uf_sfar;
+	u_long	uf_sfsr;
+	u_long	uf_tar;
+	u_long	uf_type;
+};
+
+extern char __sparc_utrap_fp_disabled[];
+extern char __sparc_utrap_gen[];
+
+void __sparc_utrap(struct utrapframe *);
+
+#endif