* i386nbsd-nat.c: New file.

* Makefile.in (ALLDEPFILES): Add i386nbsd-nat.c, i386nbsd-tdep.c,
i386obsd-nat.c and i386obsd-tdep.c.
(i386nbsd-nat.o): New dependency.
* config/i386/obsd.mh (NATDEPFILES): Add i386nbsd-nat.o and
bsd-kvm.o.
(LOADLIBES): New variable.
* config/i386/nbsdelf.mh (NATDEPFILES): Add i386nbsd-nat.o and
bsd-kvm.o.
(LOADLIBES): New variable.

1 files changed, 82 insertions, 0 deletions

diff --git a/gdb/i386nbsd-nat.c b/gdb/i386nbsd-nat.c
new file mode 100644
index 0000000..92da7e1
--- /dev/null
+++ b/gdb/i386nbsd-nat.c
@@ -0,0 +1,82 @@
+/* Native-dependent code for NetBSD/i386.
+
+   Copyright 2004 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include "defs.h"
+#include "gdbcore.h"
+#include "regcache.h"
+
+#include "i386-tdep.h"
+
+/* Support for debugging kernel virtual memory images.  */
+
+#include <sys/types.h>
+#include <machine/frame.h>
+#include <machine/pcb.h>
+
+#include "bsd-kvm.h"
+
+static int
+i386nbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
+{
+  struct switchframe sf;
+
+  /* The following is true for NetBSD 1.6.2:
+
+     The pcb contains %esp and %ebp at the point of the context switch
+     in cpu_switch().  At that point we have a stack frame as
+     described by `struct switchframe', which for NetBSD 1.6.2 has the
+     following layout:
+
+     interrupt level
+     %edi
+     %esi
+     %ebx
+     %eip
+
+     we reconstruct the register state as it would look when we just
+     returned from cpu_switch().  */
+
+  /* The stack pointer shouldn't be zero.  */
+  if (pcb->pcb_esp == 0)
+    return 0;
+
+  read_memory (pcb->pcb_esp, (char *) &sf, sizeof sf);
+  pcb->pcb_esp += sizeof (struct switchframe);
+  regcache_raw_supply (regcache, I386_EDI_REGNUM, &sf.sf_edi);
+  regcache_raw_supply (regcache, I386_ESI_REGNUM, &sf.sf_esi);
+  regcache_raw_supply (regcache, I386_EBP_REGNUM, &pcb->pcb_ebp);
+  regcache_raw_supply (regcache, I386_ESP_REGNUM, &pcb->pcb_esp);
+  regcache_raw_supply (regcache, I386_EBX_REGNUM, &sf.sf_ebx);
+  regcache_raw_supply (regcache, I386_EIP_REGNUM, &sf.sf_eip);
+
+  return 1;
+}
+
+
+/* Provide a prototype to silence -Wmissing-prototypes.  */
+void _initialize_i386nbsd_nat (void);
+
+void
+_initialize_i386nbsd_nat (void)
+{
+  /* Support debugging kernel virtual memory images.  */
+  bsd_kvm_add_target (i386nbsd_supply_pcb);
+}