sigset_t change (part 3 of 5)

-----------------------------

By introducing a new sigframe so that the signal handler operates
on the new siginfo_t and on ucontext_t instead of sigcontext, we
now need two version of sendsig and sigreturn.

A flag in struct proc determines whether the process expects an
old sigframe or a new sigframe. The signal trampoline handles
which sigreturn to call. It does this by testing for a magic
cookie in the frame.

The alpha uses osigreturn to implement longjmp. This means that
osigreturn is not only used for compatibility with existing
binaries. To handle the new sigset_t, setjmp saves it in
sc_reserved (see NOTE).

the struct sigframe has been moved from frame.h to sigframe.h
to handle the complex header dependencies that was caused by
the new sigframe.

NOTE: For the i386, the size of jmp_buf has been increased to hold
      the new sigset_t. On the alpha this has been prevented by
      using sc_reserved in sigcontext.

1 files changed, 86 insertions, 0 deletions

diff --git a/sys/i386/include/sigframe.h b/sys/i386/include/sigframe.h
new file mode 100644
index 0000000..9c47915
--- /dev/null
+++ b/sys/i386/include/sigframe.h
@@ -0,0 +1,86 @@
+/*-
+ * Copyright (c) 1999 Marcel Moolenaar
+ * 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 
+ *    in this position and unchanged.
+ * 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.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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 _MACHINE_SIGFRAME_H_
+#define _MACHINE_SIGFRAME_H_ 1
+
+struct	osigframe {
+	/*
+	 * The first three members may be used by applications.
+	 */
+
+	register_t	sf_signum;
+
+	/*
+	 * Either 'int' for old-style FreeBSD handler or 'siginfo_t *'
+	 * pointing to sf_siginfo for SA_SIGINFO handlers.
+	 */
+	register_t	sf_arg2;
+
+	/* Points to sf_siginfo.si_sc. */
+	register_t	sf_scp;
+
+	/*
+	 * The following arguments are not constrained by the
+	 * function call protocol.
+	 * Applications are not supposed to access these members,
+	 * except using the pointers we provide in the first three
+	 * arguments.
+	 */
+
+	char		*sf_addr;
+
+	union {
+		__osiginfohandler_t	*sf_action;
+		__sighandler_t		*sf_handler;
+	} sf_ahu;
+
+	/* In the SA_SIGINFO case, sf_arg2 points here. */
+	osiginfo_t	sf_siginfo;
+};
+
+struct sigframe {
+	/*
+	 * The first three members may be used by applications.
+	 */
+	register_t	sf_signum;
+	register_t	sf_siginfo;		/* code or pointer to sf_si */
+	register_t	sf_ucontext;		/* points to sf_uc */
+	register_t	__spare__;		/* Align sf_ahu */
+	union {
+		__siginfohandler_t	*sf_action;
+		__sighandler_t		*sf_handler;
+	} sf_ahu;
+	register_t	sf_sigreturn;	/* sigreturn to use */
+	siginfo_t	sf_si;		/* = *sf_siginfo (SA_SIGINFO case) */
+	ucontext_t	sf_uc;		/* = *sf_ucontext */
+};
+
+#endif /* _MACHINE_SIGFRAME_H_ */