Date: Wed, 10 Sep 1997 09:30:30 -0500 From: Jonathan Lemon <jlemon@americantv.com> To: Bruce Evans <bde@zeta.org.au> Cc: emulation@FreeBSD.ORG, hfwirth@ping.at Subject: Re: Doscmd, debugging with gdb Message-ID: <19970910093030.28970@right.PCS> In-Reply-To: <199709100440.OAA10269@godzilla.zeta.org.au>; from Bruce Evans on Sep 09, 1997 at 02:40:45PM %2B1000 References: <199709100440.OAA10269@godzilla.zeta.org.au>
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On Sep 09, 1997 at 02:40:45PM +1000, Bruce Evans wrote:
> diff -c2 vm_map.c~ vm_map.c
> *** vm_map.c~ Mon Sep 1 18:00:38 1997
> --- vm_map.c Wed Sep 10 14:02:48 1997
> ***************
> *** 2288,2292 ****
> (entry->eflags & MAP_ENTRY_COW) == 0 ||
> (entry->wired_count != 0)) {
> ! if ((fault_type & (prot)) != fault_type)
> RETURN(KERN_PROTECTION_FAILURE);
> }
> --- 2288,2293 ----
> (entry->eflags & MAP_ENTRY_COW) == 0 ||
> (entry->wired_count != 0)) {
> ! if ((fault_type & prot) !=
> ! (fault_type & ~VM_PROT_OVERRIDE_WRITE))
> RETURN(KERN_PROTECTION_FAILURE);
> }
>
Yup, this appears to fix the problem. With this patch, I can
successfully run doscmd under gdb:
> gdb obj/doscmd
(gdb) handle SIGBUS nostop noprint
(gdb) add-symbol-file obj/doscmd.kernel 0
(gdb) tbreak 96
(gdb) r -x
Breakpoint 1 at 0x27bb: file /home/jlemon/doscmd/doscmd_loader.c, line 96.
(gdb) tbreak doscmd.c:main
(gdb) c
Breakpoint 2 at 0x1171c1: file /home/jlemon/doscmd/doscmd.c, line 112.
--
Jonathan
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