* lib/gdb.exp: Abort on missing `site.exp'.

[deliverable/binutils-gdb.git] / gdb / i386obsd-nat.c

diff --git a/gdb/i386obsd-nat.c b/gdb/i386obsd-nat.c
index 01a2bbef12971d6f2006344d336e13750d3499fb..c43e962a63c4f5064fb96cd93959ba3ad4a849d4 100644 (file)
--- a/gdb/i386obsd-nat.c
+++ b/gdb/i386obsd-nat.c
@@ -1,5 +1,6 @@
 /* Native-dependent code for OpenBSD/i386.
-   Copyright 2002 Free Software Foundation, Inc.
+
+   Copyright (C) 2002, 2003, 2004, 2006, 2007 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -15,20 +16,87 @@
 
    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.  */
+   Foundation, Inc., 51 Franklin Street, Fifth Floor,
+   Boston, MA 02110-1301, USA.  */
 
 #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 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..  */
+  read_memory (pcb->pcb_esp, (char *) &sf, sizeof sf);
+  if ((unsigned int) sf.sf_ppl < 0x100 && (sf.sf_ppl & 0xf) == 0)
+    {
+      /* Yes, we have a frame that matches cpu_switch().  */
+      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
+    {
+      /* No, the pcb must have been last updated by savectx().  */
+      pcb->pcb_esp += 4;
+      regcache_raw_supply (regcache, I386_EIP_REGNUM, &sf);
+    }
+
+  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_i386fbsd_nat (void);
+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
@@ -44,16 +112,13 @@ _initialize_i386obsd_nat (void)
     int mib[2];
     size_t len;
 
-    extern CORE_ADDR i386nbsd_sigtramp_start;
-    extern CORE_ADDR i386nbsd_sigtramp_end;
-
     mib[0] = CTL_VM;
     mib[1] = VM_PSSTRINGS;
     len = sizeof (_ps);
     if (sysctl (mib, 2, &_ps, &len, NULL, 0) == 0)
       {
-       i386nbsd_sigtramp_start = (CORE_ADDR)_ps.val - 128;
-       i386nbsd_sigtramp_end = (CORE_ADDR)_ps.val;
+       i386obsd_sigtramp_start_addr = (u_long) _ps.val - 128;
+       i386obsd_sigtramp_end_addr = (u_long) _ps.val;
       }
   }
 #endif