* Makefile.in (ALLDEPFILES): Add alphanbsd-nat.c and

alphanbsd-tdep.c.
(alphanbsd-nat.o): New dependency list.
(alphanbsd-tdep.o): Ditto.
* NEWS: Note new native NetBSD/alpha configuration.
* alphanbsd-nat.c: New file.
* alphanbsd-tdep.c: Ditto.
* configure.host (alpha*-*-netbsd*): New host.
* configure.tgt (alpha*-*-netbsd*): New target.
* config/alpha/nbsd.mh: New file.
* config/alpha/nbsd.mt: Ditto.
* config/alpha/nm-nbsd.h: Ditto.
* config/alpha/tm-nbsd.h: Ditto.

1 files changed, 146 insertions, 0 deletions

diff --git a/gdb/alphanbsd-tdep.c b/gdb/alphanbsd-tdep.c
new file mode 100644
index 00000000000..3f3ae529e52
--- /dev/null
+++ b/gdb/alphanbsd-tdep.c
@@ -0,0 +1,146 @@
+/* Target-dependent code for NetBSD/Alpha.
+   Copyright 2002 Free Software Foundation, Inc.
+   Contributed by Wasabi Systems, 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 "gdbcore.h"
+#include "value.h"
+#include "solib-svr4.h"
+
+#include "alpha-tdep.h"
+
+/* Fetch (and possibly build) an appropriate link_map_offsets
+   structure for NetBSD/alpha targets using the struct offsets
+   defined in <link.h> (but without actual reference to that file).
+
+   This makes it possible to access NetBSD/alpha shared libraries
+   from a GDB that was not built on a NetBSD/alpha host (for cross
+   debugging).  */
+
+static struct link_map_offsets *
+alphanbsd_solib_svr4_fetch_link_map_offsets (void)
+{
+  static struct link_map_offsets lmo;
+  static struct link_map_offsets *lmp = NULL;
+
+  if (lmp == NULL)
+    {
+      lmp = &lmo;
+
+      lmo.r_debug_size = 32;
+
+      lmo.r_map_offset = 8;
+      lmo.r_map_size   = 8;
+
+      lmo.link_map_size = 40;
+
+      lmo.l_addr_offset = 0;
+      lmo.l_addr_size   = 8;
+
+      lmo.l_name_offset = 8;
+      lmo.l_name_size   = 8;
+
+      lmo.l_next_offset = 24;
+      lmo.l_next_size   = 8;
+
+      lmo.l_prev_offset = 32;
+      lmo.l_prev_size   = 8;
+    }
+
+  return lmp;
+}
+
+/* Under NetBSD/alpha, signal handler invocations can be identified by the
+   designated code sequence that is used to return from a signal handler.
+   In particular, the return address of a signal handler points to the
+   following code sequence:
+
+	ldq	a0, 0(sp)
+	lda	sp, 16(sp)
+	lda	v0, 295(zero)	# __sigreturn14
+	call_pal callsys
+
+   Each instruction has a unique encoding, so we simply attempt to match
+   the instruction the PC is pointing to with any of the above instructions.
+   If there is a hit, we know the offset to the start of the designated
+   sequence and can then check whether we really are executing in the
+   signal trampoline.  If not, -1 is returned, otherwise the offset from the
+   start of the return sequence is returned.  */
+static const unsigned int sigtramp_retcode[] =
+{
+  0xa61e0000,		/* ldq a0, 0(sp) */
+  0x23de0010,		/* lda sp, 16(sp) */
+  0x201f0127,		/* lda v0, 295(zero) */
+  0x00000083,		/* call_pal callsys */
+};
+#define	RETCODE_NWORDS \
+  (sizeof (sigtramp_retcode) / sizeof (sigtramp_retcode[0]))
+
+LONGEST
+alphanbsd_sigtramp_offset (CORE_ADDR pc)
+{
+  unsigned int ret[4], w;
+  LONGEST off;
+  int i;
+
+  if (read_memory_nobpt (pc, (char *) &w, 4) != 0)
+    return -1;
+
+  for (i = 0; i < RETCODE_NWORDS; i++)
+    {
+      if (w == sigtramp_retcode[i])
+	break;
+    }
+  if (i == RETCODE_NWORDS)
+    return (-1);
+
+  off = i * 4;
+  pc -= off;
+
+  if (read_memory_nobpt (pc, (char *) ret, sizeof (ret)) != 0)
+    return -1;
+
+  if (memcmp (ret, sigtramp_retcode, sizeof (sigtramp_retcode)) == 0)
+    return off;
+
+  return -1;
+}
+
+static void
+alphanbsd_init_abi (struct gdbarch_info info,
+                    struct gdbarch *gdbarch)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  /* NetBSD/alpha does not provide single step support via ptrace(2); we
+     must use software single-stepping.  */
+  set_gdbarch_software_single_step (gdbarch, alpha_software_single_step);
+
+  set_solib_svr4_fetch_link_map_offsets (gdbarch,
+                                  alphanbsd_solib_svr4_fetch_link_map_offsets);
+
+  tdep->dynamic_sigtramp_offset = alphanbsd_sigtramp_offset;
+}
+
+void
+_initialize_alphanbsd_tdep (void)
+{
+  alpha_gdbarch_register_os_abi (ALPHA_ABI_NETBSD, alphanbsd_init_abi);
+}