Jumbo-commit to enhance 32 bit application support on 64 bit kernels.

This is good enough to be able to run a RELENG_4 gdb binary against
a RELENG_4 application, along with various other tools (eg: 4.x gcore).
We use this at work.

ia32_reg.[ch]: handle the 32 bit register file format, used by ptrace,
	procfs and core dumps.
procfs_*regs.c: vary the format of proc/XXX/*regs depending on the client
	and target application.
procfs_map.c: Don't print a 64 bit value to 32 bit consumers, or their
	sscanf fails.  They expect an unsigned long.
imgact_elf.c: produce a valid 32 bit coredump for 32 bit apps.
sys_process.c: handle 32 bit consumers debugging 32 bit targets.  Note
	that 64 bit consumers can still debug 32 bit targets.

IA64 has got stubs for ia32_reg.c.

Known limitations: a 5.x/6.x gdb uses get/setcontext(), which isn't
implemented in the 32/64 wrapper yet.  We also make a tiny patch to
gdb pacify it over conflicting formats of ld-elf.so.1.

Approved by:	re

1 files changed, 82 insertions, 0 deletions

diff --git a/sys/ia64/ia32/ia32_reg.c b/sys/ia64/ia32/ia32_reg.c
new file mode 100644
index 0000000..dde8b89
--- /dev/null
+++ b/sys/ia64/ia32/ia32_reg.c
@@ -0,0 +1,82 @@
+/*-
+ * Copyright (c) 2005 Peter Wemm
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/proc.h>
+#include <sys/procfs.h>
+
+#include <compat/ia32/ia32_reg.h>
+
+int
+fill_regs32(struct thread *td, struct reg32 *regs)
+{
+
+	bzero(regs, sizeof(*regs));
+	return (EOPNOTSUPP);
+}
+
+int
+set_regs32(struct thread *td, struct reg32 *regs)
+{
+
+	return (EOPNOTSUPP);
+}
+
+int
+fill_fpregs32(struct thread *td, struct fpreg32 *regs)
+{
+
+	bzero(regs, sizeof(*regs));
+	return (EOPNOTSUPP);
+}
+
+int
+set_fpregs32(struct thread *td, struct fpreg32 *regs)
+{
+
+	return (EOPNOTSUPP);
+}
+
+int
+fill_dbregs32(struct thread *td, struct dbreg32 *regs)
+{
+
+	bzero(regs, sizeof(*regs));
+	return (EOPNOTSUPP);
+}
+
+int
+set_dbregs32(struct thread *td, struct dbreg32 *regs)
+{
+
+	return (EOPNOTSUPP);
+}