[src/trunk]: src/sys/arch/alpha/alpha Add a common debugger entry point, alph...

[thorpej <thorpej%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/f830cd0da8f4
branches:  trunk
changeset: 472089:f830cd0da8f4
user:      thorpej <thorpej%NetBSD.org@localhost>
date:      Tue Apr 20 21:09:49 1999 +0000

description:
Add a common debugger entry point, alpha_debug(), which performs various
tasks (i.e. switches to the debug stack) and then invokes the appropriate
debugger (DDB or eventually KGDB).

diffstat:

 sys/arch/alpha/alpha/debug.s |  116 +++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 116 insertions(+), 0 deletions(-)

diffs (120 lines):

diff -r 783efd0e3071 -r f830cd0da8f4 sys/arch/alpha/alpha/debug.s
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/arch/alpha/alpha/debug.s      Tue Apr 20 21:09:49 1999 +0000
@@ -0,0 +1,116 @@
+/* $NetBSD: debug.s,v 1.1 1999/04/20 21:09:49 thorpej Exp $ */
+
+/*-
+ * Copyright (c) 1999 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
+ * NASA Ames Research Center.
+ *
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *     This product includes software developed by the NetBSD
+ *     Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ */
+
+__KERNEL_RCSID(6, "$NetBSD")
+
+/*
+ * Debugger glue.
+ */
+
+       .text
+inc6:  .stabs  __FILE__,132,0,0,inc6; .loc     1 __LINE__
+
+/*
+ * Debugger stack.
+ */
+BSS(debug_stack_bottom, NBPG)
+ABS(debug_stack_top, debug_stack_bottom + NBPG)
+
+/*
+ * alpha_debug:
+ *
+ *     Single debugger entry point, handling the housekeeping
+ *     chores we need to deal with.
+ *
+ *     Arguments are:
+ *
+ *             a0      a0 from trap
+ *             a1      a1 from trap
+ *             a2      a2 from trap
+ *             a3      kernel trap entry point
+ *             a4      frame pointer
+ */
+NESTED_NOPROFILE(alpha_debug, 5, 32, ra, IM_RA|IM_S0, 0)
+       br      pv, Ldbg1
+Ldbg1: LDGP(pv)
+       lda     sp, -32(sp)             /* set up stack frame */
+       stq     ra, (32-8)(sp)          /* save ra */
+       stq     s0, (32-16)(sp)         /* save s0 */
+
+       /* Remember our current stack pointer. */
+       mov     sp, s0
+
+#if defined(MULTIPROCESSOR)
+       /*
+        * XXX PAUSE ALL OTHER CPUs.
+        */
+#endif
+
+       /*
+        * Switch to the debug stack if we're not on it already.
+        */
+       lda     t0, debug_stack_bottom
+       cmpule  sp, t0, t1              /* sp <= debug_stack_bottom */
+       bne     t1, Ldbg2               /* yes, switch now */
+
+       lda     t0, debug_stack_top
+       cmpule  t0, sp, t1              /* debug_stack_top <= sp? */
+       bne     t1, Ldbg3               /* yes, we're on the debug stack */
+
+Ldbg2:
+       lda     sp, debug_stack_top     /* sp <- debug_stack_top */
+
+Ldbg3:
+       /* Dispatch to the debugger - arguments are already in place. */
+       CALL(ddb_trap)
+
+       /* Debugger return value in v0; switch back to our previous stack. */
+       mov     s0, sp
+
+#if defined(MULTIPROCESSOR)
+       /*
+        * XXX RESUME ALL OTHER CPUs.
+        */
+#endif
+
+       ldq     ra, (32-8)(sp)          /* restore ra */
+       ldq     s0, (32-16)(sp)         /* restore s0 */
+       lda     sp, 32(sp)              /* pop stack frame */
+       RET
+       END(alpha_debug)