NetBSD Problem Report #16799

Received: (qmail 23001 invoked from network); 14 May 2002 03:27:44 -0000
Message-Id: <200205140248.g4E2m8o25441@mail.Pin.LU>
Date: Tue, 14 May 2002 04:48:08 +0200 (CEST)
From: chris@Pin.LU
Reply-To: chris@Pin.LU
Subject: gdb can't set breakpoint on remote m68k target
X-Send-Pr-Version: 3.95

>Number:         16799
>Category:       toolchain
>Synopsis:       gdb can't set breakpoint on remote m68k target
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    toolchain-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue May 14 03:28:00 +0000 2002
>Originator:     Christian Limpach
>Release:        current (as of May 14 2002)


System: NetBSD clapper 1.5ZC NetBSD 1.5ZC (CLAPPER) #46: Mon May 13 20:51:50 CEST 2002     root@marble:/devel/netbsd/src-current/sys/arch/next68k/compile/CLAPPER next68k


	gdb uses the wrong trap to set remote breakpoints.
	config/m68k/tm-nbsd.h doesn't define REMOTE_BPT_VECTOR, gdb uses the
	default 0x1.  REMOTE_BPT_VECTOR has to be defined to 0xf as it's done
	in the non-toolchain gdb.


	Set a breakpoint with remote gdb on m68k target.
	When the breakpoint is reached, the target machine panics
	and drops to gdb but it's not possible to resume execution.


	The following patch fixes the problem.

Index: dist/toolchain/gdb/config/m68k/tm-nbsd.h
RCS file: /cvsroot/gnusrc/gnu/dist/toolchain/gdb/config/m68k/tm-nbsd.h,v
retrieving revision 1.4
diff -u -r1.4 tm-nbsd.h
--- tm-nbsd.h	2002/05/10 21:24:51	1.4
+++ tm-nbsd.h	2002/05/14 02:58:46
@@ -21,10 +21,9 @@
 #ifndef TM_NBSD_H
 #define TM_NBSD_H

-/* Define BPT_VECTOR if it is different than the default.
-   This is the vector number used by traps to indicate a breakpoint. */
-#define BPT_VECTOR 0x2
+/* NetBSD uses trap 15 for both user and kernel breakpoints. */
+#define BPT_VECTOR 0xf
+#define REMOTE_BPT_VECTOR 0xf

 /* For NetBSD, sigtramp is 32 bytes before STACK_END_ADDR,
    but we don't know where that is until run-time!  */


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