* sparc-tdep.h (sparc32nbsd_sigcontext_saved_regs): New prototype.

* sparcnbsd-tdep.c (sparc32nbsd_sigcontext_saved_regs): New
function with code split out from
sparc32nbsd_sigcontext_frame_cache.
(sparc32nbsd_sigcontext_frame_cache): Use
sparc32nbsd_sigcontext_saved_regs.
(_initialize_sparc32nbsd_tdep): Don't register OS ABI handler for
OpenBSD.
* sparcobsd-tdep.c: New file.
* Makefile.in (ALLDEPFILES): Add sparcobsd-tdep.c.
(sparcobsd-tdep.o): New dependency.
* configure.tgt (sparc-*-openbsd*): Set gdb_target to obsd.
* config/sparc/obsd.mt: New file.

1 files changed, 171 insertions, 0 deletions

diff --git a/gdb/sparcobsd-tdep.c b/gdb/sparcobsd-tdep.c
new file mode 100644
index 00000000000..108e255ed13
--- /dev/null
+++ b/gdb/sparcobsd-tdep.c
@@ -0,0 +1,171 @@
+/* Target-dependent code for OpenBSD/sparc.
+
+   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 "floatformat.h"
+#include "frame.h"
+#include "frame-unwind.h"
+#include "osabi.h"
+#include "solib-svr4.h"
+#include "symtab.h"
+#include "trad-frame.h"
+
+#include "gdb_assert.h"
+
+#include "sparc-tdep.h"
+#include "nbsd-tdep.h"
+
+/* Signal trampolines.  */
+
+/* The OpenBSD kernel maps the signal trampoline at some random
+   location in user space, which means that the traditional BSD way of
+   detecting it won't work.
+
+   The signal trampoline will be mapped at an address that is page
+   aligned.  We recognize the signal trampoline by the looking for the
+   sigreturn system call.  */
+
+static const int sparc32obsd_page_size = 4096;
+
+static int
+sparc32obsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
+{
+  CORE_ADDR start_pc = (pc & ~(sparc32obsd_page_size - 1));
+  unsigned long insn;
+
+  if (name)
+    return 0;
+
+  /* Check for "restore %g0, SYS_sigreturn, %g1".  */
+  insn = sparc_fetch_instruction (start_pc + 0xec);
+  if (insn != 0x83e82067)
+    return 0;
+
+  /* Check for "t ST_SYSCALL".  */
+  insn = sparc_fetch_instruction (start_pc + 0xf4);
+  if (insn != 0x91d02000)
+    return 0;
+
+  return 1;
+}
+
+static struct sparc_frame_cache *
+sparc32obsd_frame_cache (struct frame_info *next_frame, void **this_cache)
+{
+  struct sparc_frame_cache *cache;
+  CORE_ADDR addr;
+
+  if (*this_cache)
+    return *this_cache;
+
+  cache = sparc_frame_cache (next_frame, this_cache);
+  gdb_assert (cache == *this_cache);
+
+  /* If we couldn't find the frame's function, we're probably dealing
+     with an on-stack signal trampoline.  */
+  if (cache->pc == 0)
+    {
+      cache->pc = frame_pc_unwind (next_frame);
+      cache->pc &= ~(sparc32obsd_page_size - 1);
+
+      /* Since we couldn't find the frame's function, the cache was
+         initialized under the assumption that we're frameless.  */
+      cache->frameless_p = 0;
+      addr = frame_unwind_register_unsigned (next_frame, SPARC_FP_REGNUM);
+      cache->base = addr;
+    }
+
+  cache->saved_regs = sparc32nbsd_sigcontext_saved_regs (next_frame);
+
+  return cache;
+}
+
+static void
+sparc32obsd_frame_this_id (struct frame_info *next_frame, void **this_cache,
+			   struct frame_id *this_id)
+{
+  struct sparc_frame_cache *cache =
+    sparc32obsd_frame_cache (next_frame, this_cache);
+
+  (*this_id) = frame_id_build (cache->base, cache->pc);
+}
+
+static void
+sparc32obsd_frame_prev_register (struct frame_info *next_frame,
+				 void **this_cache,
+				 int regnum, int *optimizedp,
+				 enum lval_type *lvalp, CORE_ADDR *addrp,
+				 int *realnump, void *valuep)
+{
+  struct sparc_frame_cache *cache =
+    sparc32obsd_frame_cache (next_frame, this_cache);
+
+  trad_frame_prev_register (next_frame, cache->saved_regs, regnum,
+			    optimizedp, lvalp, addrp, realnump, valuep);
+}
+
+static const struct frame_unwind sparc32obsd_frame_unwind =
+{
+  SIGTRAMP_FRAME,
+  sparc32obsd_frame_this_id,
+  sparc32obsd_frame_prev_register
+};
+
+static const struct frame_unwind *
+sparc32obsd_sigtramp_frame_sniffer (struct frame_info *next_frame)
+{
+  CORE_ADDR pc = frame_pc_unwind (next_frame);
+  char *name;
+
+  find_pc_partial_function (pc, &name, NULL, NULL);
+  if (sparc32obsd_pc_in_sigtramp (pc, name))
+    return &sparc32obsd_frame_unwind;
+
+  return NULL;
+}
+
+
+static void
+sparc32obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  /* OpenBSD doesn't support the 128-bit `long double' from the psABI.  */
+  set_gdbarch_long_double_bit (gdbarch, 64);
+  set_gdbarch_long_double_format (gdbarch, &floatformat_ieee_double_big);
+
+  set_gdbarch_pc_in_sigtramp (gdbarch, sparc32obsd_pc_in_sigtramp);
+  frame_unwind_append_sniffer (gdbarch, sparc32obsd_sigtramp_frame_sniffer);
+
+  set_solib_svr4_fetch_link_map_offsets
+    (gdbarch, nbsd_ilp32_solib_svr4_fetch_link_map_offsets);
+}
+
+
+/* Provide a prototype to silence -Wmissing-prototypes.  */
+void _initialize_sparc32obsd_tdep (void);
+
+void
+_initialize_sparc32obsd_tdep (void)
+{
+  gdbarch_register_osabi (bfd_arch_sparc, 0, GDB_OSABI_OPENBSD_ELF,
+			  sparc32obsd_init_abi);
+}