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*BSD/alpha libkvm support

Committed.

Index: ChangeLog
from  Mark Kettenis  <kettenis@gnu.org>

	* alpha-tdep.h (ALPHA_S0_REGNUM): New define.
	* alphabsd-nat.c: Include <sys/types.h>, <sys/signal.h>,
	<machine/pcb.h> and "bsd-kvm.h".
	(alphabsd_supply_pcb): New function.
	(_initialize_alphabsd_nat): Enable libkvm interface.
	* Makefile.in (alphabsd-nat.o): Update dependencies.
	* config/alpha/fbsd.mh (NATDEPFILES): Add bsd-kvm.o.
	(LOADLIBES): New variable.
	* config/alpha/nbsd.mh (NATDEPFILES): Add bsd-kvm.o.
	(LOADLIBES): New variable.

Index: alpha-tdep.h
===================================================================
RCS file: /cvs/src/src/gdb/alpha-tdep.h,v
retrieving revision 1.25
diff -u -p -r1.25 alpha-tdep.h
--- alpha-tdep.h 11 Jul 2006 20:44:53 -0000 1.25
+++ alpha-tdep.h 31 Jul 2006 20:14:41 -0000
@@ -40,6 +40,7 @@
 
 #define ALPHA_V0_REGNUM	     0  /* Function integer return value */
 #define ALPHA_T7_REGNUM	     8  /* Return address register for OSF/1 __add* */
+#define ALPHA_S0_REGNUM      9	/* First saved register */
 #define ALPHA_GCC_FP_REGNUM 15  /* Used by gcc as frame register */
 #define ALPHA_A0_REGNUM     16  /* Loc of first arg during a subr call */
 #define ALPHA_T9_REGNUM     23  /* Return address register for OSF/1 __div* */
Index: alphabsd-nat.c
===================================================================
RCS file: /cvs/src/src/gdb/alphabsd-nat.c,v
retrieving revision 1.15
diff -u -p -r1.15 alphabsd-nat.c
--- alphabsd-nat.c 17 Dec 2005 22:33:59 -0000 1.15
+++ alphabsd-nat.c 31 Jul 2006 20:14:42 -0000
@@ -1,6 +1,7 @@
 /* Native-dependent code for Alpha BSD's.
 
-   Copyright (C) 2000, 2001, 2002, 2004, 2005 Free Software Foundation, Inc.
+   Copyright (C) 2000, 2001, 2002, 2004, 2005, 2006
+   Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -150,6 +151,40 @@ alphabsd_store_inferior_registers (int r
 	perror_with_name (_("Couldn't write floating point status"));
     }
 }
+
+
+/* Support for debugging kernel virtual memory images.  */
+
+#include <sys/types.h>
+#include <sys/signal.h>
+#include <machine/pcb.h>
+
+#include "bsd-kvm.h"
+
+static int
+alphabsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
+{
+  int regnum;
+
+  /* The following is true for OpenBSD 3.9:
+
+     The pcb contains the register state at the context switch inside
+     cpu_switch().  */
+
+  /* The stack pointer shouldn't be zero.  */
+  if (pcb->pcb_hw.apcb_ksp == 0)
+    return 0;
+
+  regcache_raw_supply (regcache, ALPHA_SP_REGNUM, &pcb->pcb_hw.apcb_ksp);
+
+  for (regnum = ALPHA_S0_REGNUM; regnum < ALPHA_A0_REGNUM; regnum++)
+    regcache_raw_supply (regcache, regnum,
+			 &pcb->pcb_context[regnum - ALPHA_S0_REGNUM]);
+  regcache_raw_supply (regcache, ALPHA_RA_REGNUM, &pcb->pcb_context[7]);
+
+  return 1;
+}
+
 
 /* Provide a prototype to silence -Wmissing-prototypes.  */
 void _initialize_alphabsd_nat (void);
@@ -163,4 +198,7 @@ _initialize_alphabsd_nat (void)
   t->to_fetch_registers = alphabsd_fetch_inferior_registers;
   t->to_store_registers = alphabsd_store_inferior_registers;
   add_target (t);
+
+  /* Support debugging kernel virtual memory images.  */
+  bsd_kvm_add_target (alphabsd_supply_pcb);
 }
Index: Makefile.in
===================================================================
RCS file: /cvs/src/src/gdb/Makefile.in,v
retrieving revision 1.833
diff -u -p -r1.833 Makefile.in
--- Makefile.in 19 Jul 2006 23:23:35 -0000 1.833
+++ Makefile.in 31 Jul 2006 20:14:44 -0000
@@ -1694,7 +1694,8 @@ aix-thread.o: aix-thread.c $(defs_h) $(g
 	$(target_h) $(inferior_h) $(regcache_h) $(gdbcmd_h) $(ppc_tdep_h) \
 	$(gdb_string_h)
 alphabsd-nat.o: alphabsd-nat.c $(defs_h) $(inferior_h) $(regcache_h) \
-	$(alpha_tdep_h) $(alphabsd_tdep_h) $(inf_ptrace_h) $(gregset_h)
+	$(alpha_tdep_h) $(alphabsd_tdep_h) $(inf_ptrace_h) $(gregset_h) \
+	$(bsd_kvm_h)
 alphabsd-tdep.o: alphabsd-tdep.c $(defs_h) $(alpha_tdep_h) \
 	$(alphabsd_tdep_h)
 alphafbsd-tdep.o: alphafbsd-tdep.c $(defs_h) $(value_h) $(osabi_h) \
Index: config/alpha/fbsd.mh
===================================================================
RCS file: /cvs/src/src/gdb/config/alpha/fbsd.mh,v
retrieving revision 1.9
diff -u -p -r1.9 fbsd.mh
--- config/alpha/fbsd.mh 15 Jan 2006 20:53:32 -0000 1.9
+++ config/alpha/fbsd.mh 31 Jul 2006 20:14:44 -0000
@@ -1,4 +1,6 @@
 # Host: FreeBSD/alpha
 NATDEPFILES= fork-child.o inf-ptrace.o \
-	fbsd-nat.o alphabsd-nat.o \
+	fbsd-nat.o alphabsd-nat.o bsd-kvm.o \
 	gcore.o corelow.o core-regset.o
+
+LOADLIBES= -lkvm
Index: config/alpha/nbsd.mh
===================================================================
RCS file: /cvs/src/src/gdb/config/alpha/nbsd.mh,v
retrieving revision 1.6
diff -u -p -r1.6 nbsd.mh
--- config/alpha/nbsd.mh 15 Jan 2006 20:53:32 -0000 1.6
+++ config/alpha/nbsd.mh 31 Jul 2006 20:14:44 -0000
@@ -1,2 +1,4 @@
 # Host: NetBSD/alpha
-NATDEPFILES= fork-child.o inf-ptrace.o alphabsd-nat.o
+NATDEPFILES= fork-child.o inf-ptrace.o alphabsd-nat.o bsd-kvm.o
+
+LOADLIBES= -lkvm
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