Add skeletal support for GDB. In particular gdb_cpu_getreg() needs

implementing to make GDB support usable.

sys/conf/files.powerpc

@@ -52,6 +52,7 @@ powerpc/powerpc/cpu.c		standard
 powerpc/powerpc/elf_machdep.c	standard
 powerpc/powerpc/fpu.c		standard
 powerpc/powerpc/fuswintr.c	standard
+powerpc/powerpc/gdb_machdep.c	optional	gdb
 powerpc/powerpc/in_cksum.c	optional	inet
 powerpc/powerpc/interrupt.c	standard
 powerpc/powerpc/intr_machdep.c	standard
@@ -121,6 +122,7 @@ powerpc/powermac/macio.c	optional	powermac pci
 powerpc/powermac/openpic_macio.c optional	powermac pci
 powerpc/powermac/pswitch.c	optional	powermac pswitch
 powerpc/powermac/uninorth.c	optional	powermac pci
+powerpc/powermac/viapmu.c	optional	powermac
 
 powerpc/psim/iobus.c 		optional psim
 powerpc/psim/ata_iobus.c	optional ata psim

sys/powerpc/include/gdb_machdep.h

@@ -0,0 +1,53 @@
+/*-
+ * Copyright (c) 2006 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.
+ * 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 ``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_GDB_MACHDEP_H_
+#define	_MACHINE_GDB_MACHDEP_H_
+
+#define GDB_NREGS	153
+#define	GDB_REG_PC	64
+
+#define	GDB_BUFSZ	(GDB_NREGS*4)
+
+static __inline size_t
+gdb_cpu_regsz(int regnum)
+{
+	return (sizeof(int));
+}
+
+static __inline int
+gdb_cpu_query(void)
+{
+	return (0);
+}
+
+void *gdb_cpu_getreg(int, size_t *);
+void gdb_cpu_setreg(int, void *);
+int gdb_cpu_signal(int, int);
+
+#endif /* !_MACHINE_GDB_MACHDEP_H_ */

sys/powerpc/powerpc/gdb_machdep.c

@@ -0,0 +1,72 @@
+/*-
+ * Copyright (c) 2006 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.
+ * 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 AUTHORS ``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 AUTHORS 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/systm.h>
+#include <sys/kdb.h>
+#include <sys/kernel.h>
+#include <sys/proc.h>
+#include <sys/signal.h>
+
+#include <machine/gdb_machdep.h>
+#include <machine/pcb.h>
+#include <machine/reg.h>
+#include <machine/trap.h>
+
+#include <gdb/gdb.h>
+#include <gdb/gdb_int.h>
+
+void *
+gdb_cpu_getreg(int regnum, size_t *regsz)
+{
+
+	*regsz = gdb_cpu_regsz(regnum);
+	switch (regnum) {
+	}
+	return (NULL);
+}
+
+void
+gdb_cpu_setreg(int regnum, void *val)
+{
+
+	switch (regnum) {
+	case GDB_REG_PC:
+		break;
+	}
+}
+
+int
+gdb_cpu_signal(int vector, int dummy __unused)
+{
+
+	if (vector == EXC_TRC || vector == EXC_RUNMODETRC)
+		return (SIGTRAP);
+	return (vector);
+}