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, 231 insertions, 0 deletions

diff --git a/sys/ia64/ia64/gdb_machdep.c b/sys/ia64/ia64/gdb_machdep.c
new file mode 100644
index 0000000..8cf6085
--- /dev/null
+++ b/sys/ia64/ia64/gdb_machdep.c
@@ -0,0 +1,177 @@
+/*
+ * 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/proc.h>
+#include <sys/signal.h>
+
+#include <machine/gdb_machdep.h>
+#include <machine/md_var.h>
+#include <machine/pcb.h>
+#include <machine/reg.h>
+
+#include <gdb/gdb.h>
+#include <gdb/gdb_int.h>
+
+void *
+gdb_cpu_getreg(int regnum, size_t *regsz)
+{
+	static uint64_t synth;
+	uint64_t cfm;
+
+	*regsz = gdb_cpu_regsz(regnum);
+	switch (regnum) {
+	/* Registers 0-127: general registers. */
+	case 1:  return (&kdb_thrctx->pcb_special.gp);
+	case 4:  return (&kdb_thrctx->pcb_preserved.gr4);
+	case 5:  return (&kdb_thrctx->pcb_preserved.gr5);
+	case 6:  return (&kdb_thrctx->pcb_preserved.gr6);
+	case 7:  return (&kdb_thrctx->pcb_preserved.gr7);
+	case 12: return (&kdb_thrctx->pcb_special.sp);
+	case 13: return (&kdb_thrctx->pcb_special.tp);
+	/* Registers 128-255: floating-point registers. */
+	case 130: return (&kdb_thrctx->pcb_preserved_fp.fr2);
+	case 131: return (&kdb_thrctx->pcb_preserved_fp.fr3);
+	case 132: return (&kdb_thrctx->pcb_preserved_fp.fr4);
+	case 133: return (&kdb_thrctx->pcb_preserved_fp.fr5);
+	case 144: return (&kdb_thrctx->pcb_preserved_fp.fr16);
+	case 145: return (&kdb_thrctx->pcb_preserved_fp.fr17);
+	case 146: return (&kdb_thrctx->pcb_preserved_fp.fr18);
+	case 147: return (&kdb_thrctx->pcb_preserved_fp.fr19);
+	case 148: return (&kdb_thrctx->pcb_preserved_fp.fr20);
+	case 149: return (&kdb_thrctx->pcb_preserved_fp.fr21);
+	case 150: return (&kdb_thrctx->pcb_preserved_fp.fr22);
+	case 151: return (&kdb_thrctx->pcb_preserved_fp.fr23);
+	case 152: return (&kdb_thrctx->pcb_preserved_fp.fr24);
+	case 153: return (&kdb_thrctx->pcb_preserved_fp.fr25);
+	case 154: return (&kdb_thrctx->pcb_preserved_fp.fr26);
+	case 155: return (&kdb_thrctx->pcb_preserved_fp.fr27);
+	case 156: return (&kdb_thrctx->pcb_preserved_fp.fr28);
+	case 157: return (&kdb_thrctx->pcb_preserved_fp.fr29);
+	case 158: return (&kdb_thrctx->pcb_preserved_fp.fr30);
+	case 159: return (&kdb_thrctx->pcb_preserved_fp.fr31);
+	/* Registers 320-327: branch registers. */
+	case 320:
+		if (kdb_thrctx->pcb_special.__spare == ~0UL)
+			return (&kdb_thrctx->pcb_special.rp);
+		break;
+	case 321: return (&kdb_thrctx->pcb_preserved.br1);
+	case 322: return (&kdb_thrctx->pcb_preserved.br2);
+	case 323: return (&kdb_thrctx->pcb_preserved.br3);
+	case 324: return (&kdb_thrctx->pcb_preserved.br4);
+	case 325: return (&kdb_thrctx->pcb_preserved.br5);
+	/* Registers 328-333: misc. other registers. */
+	case 330: return (&kdb_thrctx->pcb_special.pr);
+	case 331:
+		if (kdb_thrctx->pcb_special.__spare == ~0UL) {
+			synth = kdb_thrctx->pcb_special.iip;
+			synth += (kdb_thrctx->pcb_special.psr >> 41) & 3;
+			return (&synth);
+		}
+		return (&kdb_thrctx->pcb_special.rp);
+	case 333:
+		if (kdb_thrctx->pcb_special.__spare == ~0UL)
+			return (&kdb_thrctx->pcb_special.cfm);
+		return (&kdb_thrctx->pcb_special.pfs);
+	/* Registers 334-461: application registers. */
+	case 350: return (&kdb_thrctx->pcb_special.rsc);
+	case 351: /* bsp */
+	case 352: /* bspstore. */
+		synth = kdb_thrctx->pcb_special.bspstore;
+		if (kdb_thrctx->pcb_special.__spare == ~0UL) {
+			synth += kdb_thrctx->pcb_special.ndirty;
+		} else {
+			cfm = kdb_thrctx->pcb_special.pfs;
+			synth = ia64_bsp_adjust(synth,
+			    IA64_CFM_SOF(cfm) - IA64_CFM_SOL(cfm));
+		}
+		return (&synth);
+	case 353: return (&kdb_thrctx->pcb_special.rnat);
+	case 370: return (&kdb_thrctx->pcb_special.unat);
+	case 374: return (&kdb_thrctx->pcb_special.fpsr);
+	case 398:
+		if (kdb_thrctx->pcb_special.__spare == ~0UL)
+			return (&kdb_thrctx->pcb_special.pfs);
+		break;
+	case 399: return (&kdb_thrctx->pcb_preserved.lc);
+	}
+	return (NULL);
+}
+
+void
+gdb_cpu_setreg(int regnum, register_t val)
+{
+
+	switch (regnum) {
+	case GDB_REG_PC: break;
+	}
+}
+
+int
+gdb_cpu_query(void)
+{
+#if 0
+	uint64_t bspstore, *kstack;
+#endif
+	uintmax_t slot;
+
+	if (!gdb_rx_equal("Part:dirty:read::"))
+		return (0);
+
+	if (gdb_rx_varhex(&slot) < 0) {
+		gdb_tx_err(EINVAL);
+		return (-1);
+	}
+
+	gdb_tx_err(EINVAL);
+	return (-1);
+
+#if 0
+	/* slot is unsigned. No need to test for negative values. */
+	if (slot >= (kdb_frame->tf_special.ndirty >> 3)) {
+		return (-1);
+	}
+
+	/*
+	 * If the trapframe describes a kernel entry, bspstore holds
+	 * the address of the user backing store. Calculate the right
+	 * kernel stack address. See also ptrace_machdep().
+	 */
+	bspstore = kdb_frame->tf_special.bspstore;
+	kstack = (bspstore >= IA64_RR_BASE(5)) ? (uint64_t*)bspstore :
+	    (uint64_t*)(kdb_thread->td_kstack + (bspstore & 0x1ffUL));
+	gdb_tx_begin('\0');
+	gdb_tx_mem((void*)(kstack + slot), 8);
+	gdb_tx_end();
+	return (1);
+#endif
+}
diff --git a/sys/ia64/include/gdb_machdep.h b/sys/ia64/include/gdb_machdep.h
new file mode 100644
index 0000000..70ff840
--- /dev/null
+++ b/sys/ia64/include/gdb_machdep.h
@@ -0,0 +1,54 @@
+/*
+ * 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_NREGS	462
+#define	GDB_REG_PC	331
+
+#define	GDB_BUFSZ	(GDB_NREGS*16+128*16)
+
+static __inline size_t
+gdb_cpu_regsz(int regnum)
+{
+	return ((regnum >= 128 && regnum < 256) ? 16 : 8);
+}
+
+static __inline int
+gdb_cpu_signal(int vector, int dummy __unused)
+{
+	/* Add 100 so GDB won't translate the vector into signal names. */
+	return (vector + 100);
+}
+
+void *gdb_cpu_getreg(int, size_t *);
+void gdb_cpu_setreg(int, register_t);
+int gdb_cpu_query(void);
+
+#endif /* !_MACHINE_GDB_MACHDEP_H_ */