Introduce the GDB debugger backend for the new KDB framework. The

backend improves over the old GDB support in the following ways:
o  Unified implementation with minimal MD code.
o  A simple interface for devices to register themselves as debug
   ports, ala consoles.
o  Compression by using run-length encoding.
o  Implements GDB threading support.

2 files changed, 153 insertions, 0 deletions

diff --git a/sys/alpha/alpha/gdb_machdep.c b/sys/alpha/alpha/gdb_machdep.c
new file mode 100644
index 0000000..cbc38a8
--- /dev/null
+++ b/sys/alpha/alpha/gdb_machdep.c
@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 2004 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/signal.h>
+
+#include <machine/gdb_machdep.h>
+#include <machine/pcb.h>
+#include <machine/reg.h>
+
+#include <gdb/gdb.h>
+
+void *
+gdb_cpu_getreg(int regnum, size_t *regsz)
+{
+
+	*regsz = gdb_cpu_regsz(regnum);
+	switch (regnum) {
+	case 9:  return (&kdb_thrctx->pcb_context[0]);
+	case 10: return (&kdb_thrctx->pcb_context[1]);
+	case 11: return (&kdb_thrctx->pcb_context[2]);
+	case 12: return (&kdb_thrctx->pcb_context[3]);
+	case 13: return (&kdb_thrctx->pcb_context[4]);
+	case 14: return (&kdb_thrctx->pcb_context[5]);
+	case 15: return (&kdb_thrctx->pcb_context[6]);
+	case 30: return (&kdb_thrctx->pcb_hw.apcb_ksp);
+	case 64: return (&kdb_thrctx->pcb_context[7]);
+	}
+	return (NULL);
+}
+
+void
+gdb_cpu_setreg(int regnum, register_t val)
+{
+	switch (regnum) {
+	}
+}
+
+int
+gdb_cpu_signal(int entry, int code)
+{
+	switch (entry) {
+	case ALPHA_KENTRY_INT:
+	case ALPHA_KENTRY_ARITH:
+		return (SIGILL);	/* Can this happen? */
+	case ALPHA_KENTRY_MM:
+		switch (code) {
+		case ALPHA_MMCSR_INVALTRANS:
+			return (SIGSEGV);
+		case ALPHA_MMCSR_ACCESS:
+		case ALPHA_MMCSR_FOR:
+		case ALPHA_MMCSR_FOE:
+		case ALPHA_MMCSR_FOW:
+			return (SIGBUS);
+		}
+	case ALPHA_KENTRY_IF:
+		switch (code) {
+		case ALPHA_IF_CODE_BUGCHK:
+		case ALPHA_IF_CODE_BPT:
+			return (SIGTRAP);
+		case ALPHA_IF_CODE_GENTRAP:
+		case ALPHA_IF_CODE_FEN:
+		case ALPHA_IF_CODE_OPDEC:
+			return (SIGILL);
+		}
+	case ALPHA_KENTRY_UNA:
+		return (SIGSEGV);
+	case ALPHA_KENTRY_SYS:
+		return (SIGILL);
+	}
+	return (SIGILL);
+}
diff --git a/sys/alpha/include/gdb_machdep.h b/sys/alpha/include/gdb_machdep.h
new file mode 100644
index 0000000..5ca5d69
--- /dev/null
+++ b/sys/alpha/include/gdb_machdep.h
@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2004 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_BUFSZ	600
+#define	GDB_NREGS	67
+#define	GDB_REG_PC	64
+
+static __inline size_t
+gdb_cpu_regsz(int regnum)
+{
+	return (sizeof(long));
+}
+
+static __inline int
+gdb_cpu_query(void)
+{
+	return (0);
+}
+
+void *gdb_cpu_getreg(int, size_t *);
+void gdb_cpu_setreg(int, register_t);
+int gdb_cpu_signal(int, int);
+
+#endif /* !_MACHINE_GDB_MACHDEP_H_ */