/* Native-dependent code for OpenBSD/i386.
- Copyright 2002 Free Software Foundation, Inc.
+
+ Copyright (C) 2002, 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011
+ 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
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
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. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
+#include "gdbcore.h"
+#include "regcache.h"
+#include "target.h"
#include <sys/param.h>
#include <sys/sysctl.h>
+#include <machine/frame.h>
+#include <machine/pcb.h>
+
+#include "i386-tdep.h"
+#include "i386bsd-nat.h"
+#include "bsd-kvm.h"
+
+static int
+i386obsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
+{
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ struct switchframe sf;
+
+ /* The following is true for OpenBSD 3.6:
+
+ 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 OpenBSD 3.6 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 the stack frame, and check its validity. We do this by
+ checking if the saved interrupt priority level in the stack frame
+ looks reasonable.. */
+#ifdef PCB_SAVECTX
+ if ((pcb->pcb_flags & PCB_SAVECTX) == 0)
+ {
+ /* Yes, we have a frame that matches cpu_switch(). */
+ 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_EBX_REGNUM, &sf.sf_ebx);
+ regcache_raw_supply (regcache, I386_EIP_REGNUM, &sf.sf_eip);
+ }
+ else
+#endif
+ {
+ /* No, the pcb must have been last updated by savectx(). */
+ pcb->pcb_esp = pcb->pcb_ebp;
+ pcb->pcb_ebp = read_memory_integer(pcb->pcb_esp, 4, byte_order);
+ sf.sf_eip = read_memory_integer(pcb->pcb_esp + 4, 4, byte_order);
+ regcache_raw_supply (regcache, I386_EIP_REGNUM, &sf.sf_eip);
+ }
+
+ regcache_raw_supply (regcache, I386_EBP_REGNUM, &pcb->pcb_ebp);
+ regcache_raw_supply (regcache, I386_ESP_REGNUM, &pcb->pcb_esp);
+
+ return 1;
+}
+\f
/* Prevent warning from -Wmissing-prototypes. */
void _initialize_i386obsd_nat (void);
void
_initialize_i386obsd_nat (void)
{
+ /* We've got nothing to add to the common *BSD/i386 target. */
+ add_target (i386bsd_target ());
+
+ /* Support debugging kernel virtual memory images. */
+ bsd_kvm_add_target (i386obsd_supply_pcb);
+
/* OpenBSD provides a vm.psstrings sysctl that we can use to locate
the sigtramp. That way we can still recognize a sigtramp if its
location is changed in a new kernel. This is especially
int mib[2];
size_t len;
- extern CORE_ADDR i386obsd_sigtramp_start;
- extern CORE_ADDR i386obsd_sigtramp_end;
-
mib[0] = CTL_VM;
mib[1] = VM_PSSTRINGS;
len = sizeof (_ps);
if (sysctl (mib, 2, &_ps, &len, NULL, 0) == 0)
{
- i386obsd_sigtramp_start = (CORE_ADDR)_ps.val - 128;
- i386obsd_sigtramp_end = (CORE_ADDR)_ps.val;
+ i386obsd_sigtramp_start_addr = (u_long) _ps.val - 128;
+ i386obsd_sigtramp_end_addr = (u_long) _ps.val;
}
}
#endif