Add support for ELF core files on OpenBSD/sparc64.

gdb/ChangeLog:

        * sparc64obsd-tdep.c (sparc64obsd_gregset): New variable.
        (sparc64obsd_supply_gregset): Handle registers sets used in ELF
        core dumps.
        (sparc64obsd_init_abi): Adjust minimum size of the general purpose
        register set used in ELF core dumps.  Add floating-point register set.

gdb/ChangeLog

@@ -1,3 +1,11 @@
+2014-02-04  Mark Kettenis  <kettenis@gnu.org>
+
+	* sparc64obsd-tdep.c (sparc64obsd_gregset): New variable.
+	(sparc64obsd_supply_gregset): Handle registers sets used in ELF
+	core dumps.
+	(sparc64obsd_init_abi): Adjust minimum size of the general purpose
+	register set used in ELF core dumps.  Add floating-point register set.
+
 2014-02-03  Kevin Buettner  <kevinb@redhat.com>
 
 	* mn10300-tdep.c (mn10300_dwarf2_reg_to_regnum): Rewrite 

gdb/sparc64obsd-tdep.c

@@ -35,14 +35,30 @@
 #include "solib-svr4.h"
 #include "bsd-uthread.h"
 
-/* OpenBSD uses the traditional NetBSD core file format, even for
+/* Older OpenBSD versions used the traditional NetBSD core file
-   ports that use ELF.  The core files don't use multiple register
+   format, even for ports that use ELF.  These core files don't use
-   sets.  Instead, the general-purpose and floating-point registers
+   multiple register sets.  Instead, the general-purpose and
-   are lumped together in a single section.  Unlike on NetBSD, OpenBSD
+   floating-point registers are lumped together in a single section.
-   uses a different layout for its general-purpose registers than the
+   Unlike on NetBSD, OpenBSD uses a different layout for its
-   layout used for ptrace(2).  */
+   general-purpose registers than the layout used for ptrace(2).
+
+   Newer OpenBSD versions use ELF core files.  Here the register sets
+   match the ptrace(2) layout.  */
 
 /* From <machine/reg.h>.  */
+const struct sparc_gregset sparc64obsd_gregset =
+{
+  0 * 8,			/* "tstate" */
+  1 * 8,			/* %pc */
+  2 * 8,			/* %npc */
+  3 * 8,			/* %y */
+  -1,				/* %fprs */
+  -1,
+  5 * 8,			/* %g1 */
+  20 * 8,			/* %l0 */
+  4				/* sizeof (%y) */
+};
+
 const struct sparc_gregset sparc64obsd_core_gregset =
 {
   0 * 8,			/* "tstate" */
@@ -61,10 +77,24 @@ sparc64obsd_supply_gregset (const struct regset *regset,
 			    struct regcache *regcache,
 			    int regnum, const void *gregs, size_t len)
 {
-  const char *regs = gregs;
+  const void *fpregs = (char *)gregs + 288;
 
-  sparc64_supply_gregset (&sparc64obsd_core_gregset, regcache, regnum, regs);
+  if (len < 832)
-  sparc64_supply_fpregset (&sparc64_bsd_fpregset, regcache, regnum, regs + 288);
+    {
+      sparc64_supply_gregset (&sparc64obsd_gregset, regcache, regnum, gregs);
+      return;
+    }
+
+  sparc64_supply_gregset (&sparc64obsd_core_gregset, regcache, regnum, gregs);
+  sparc64_supply_fpregset (&sparc64_bsd_fpregset, regcache, regnum, fpregs);
+}
+
+static void
+sparc64obsd_supply_fpregset (const struct regset *regset,
+			     struct regcache *regcache,
+			     int regnum, const void *fpregs, size_t len)
+{
+  sparc64_supply_fpregset (&sparc64_bsd_fpregset, regcache, regnum, fpregs);
 }
 
 
@@ -379,7 +409,10 @@ sparc64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 
   tdep->gregset = regset_alloc (gdbarch, sparc64obsd_supply_gregset, NULL);
-  tdep->sizeof_gregset = 832;
+  tdep->sizeof_gregset = 288;
+
+  tdep->fpregset = regset_alloc (gdbarch, sparc64obsd_supply_fpregset, NULL);
+  tdep->sizeof_fpregset = 272;
 
   /* Make sure we can single-step "new" syscalls.  */
   tdep->step_trap = sparcnbsd_step_trap;