1 files changed, 137 insertions, 0 deletions
diff --git a/gdb/alpha-obsd-tdep.c b/gdb/alpha-obsd-tdep.c
new file mode 100644
index 0000000..98436f3
--- /dev/null
+++ b/gdb/alpha-obsd-tdep.c
@@ -0,0 +1,137 @@
+/* Target-dependent code for OpenBSD/alpha.
+
+   Copyright (C) 2006-2016 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 3 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, see <http://www.gnu.org/licenses/>.  */
+
+#include "defs.h"
+#include "frame.h"
+#include "gdbcore.h"
+#include "osabi.h"
+
+#include "obsd-tdep.h"
+#include "alpha-tdep.h"
+#include "alpha-bsd-tdep.h"
+#include "solib-svr4.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 looking for the
+   sigreturn system call.  */
+
+static const int alphaobsd_page_size = 8192;
+
+static LONGEST
+alphaobsd_sigtramp_offset (struct gdbarch *gdbarch, CORE_ADDR pc)
+{
+  return (pc & (alphaobsd_page_size - 1));
+}
+
+static int
+alphaobsd_pc_in_sigtramp (struct gdbarch *gdbarch,
+			  CORE_ADDR pc, const char *name)
+{
+  CORE_ADDR start_pc = (pc & ~(alphaobsd_page_size - 1));
+  unsigned insn;
+
+  if (name)
+    return 0;
+
+  /* Check for "".  */
+  insn = alpha_read_insn (gdbarch, start_pc + 5 * ALPHA_INSN_SIZE);
+  if (insn != 0x201f0067)
+    return 0;
+
+  /* Check for "".  */
+  insn = alpha_read_insn (gdbarch, start_pc + 6 * ALPHA_INSN_SIZE);
+  if (insn != 0x00000083)
+    return 0;
+
+  return 1;
+}
+
+static CORE_ADDR
+alphaobsd_sigcontext_addr (struct frame_info *this_frame)
+{
+  struct gdbarch *gdbarch = get_frame_arch (this_frame);
+  CORE_ADDR pc = get_frame_pc (this_frame);
+
+  if (alphaobsd_sigtramp_offset (gdbarch, pc) < 3 * ALPHA_INSN_SIZE)
+    {
+      /* On entry, a pointer the `struct sigcontext' is passed in %a2.  */
+      return get_frame_register_unsigned (this_frame, ALPHA_A0_REGNUM + 2);
+    }
+  else if (alphaobsd_sigtramp_offset (gdbarch, pc) < 4 * ALPHA_INSN_SIZE)
+    {
+      /* It is stored on the stack Before calling the signal handler.  */
+      CORE_ADDR sp;
+      sp = get_frame_register_unsigned (this_frame, ALPHA_SP_REGNUM);
+      return get_frame_memory_unsigned (this_frame, sp, 8);
+    }
+  else
+    {
+      /* It is reloaded into %a0 for the sigreturn(2) call.  */
+      return get_frame_register_unsigned (this_frame, ALPHA_A0_REGNUM);
+    }
+}
+
+
+static void
+alphaobsd_init_abi(struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  /* Hook into the DWARF CFI frame unwinder.  */
+  alpha_dwarf2_init_abi (info, gdbarch);
+
+  /* Hook into the MDEBUG frame unwinder.  */
+  alpha_mdebug_init_abi (info, gdbarch);
+
+  /* OpenBSD/alpha 3.0 and earlier does not provide single step
+     support via ptrace(2); use software single-stepping for now.  */
+  set_gdbarch_software_single_step (gdbarch, alpha_software_single_step);
+
+  /* OpenBSD/alpha has SVR4-style shared libraries.  */
+  set_solib_svr4_fetch_link_map_offsets
+    (gdbarch, svr4_lp64_fetch_link_map_offsets);
+  set_gdbarch_skip_solib_resolver (gdbarch, obsd_skip_solib_resolver);
+
+  tdep->dynamic_sigtramp_offset = alphaobsd_sigtramp_offset;
+  tdep->pc_in_sigtramp = alphaobsd_pc_in_sigtramp;
+  tdep->sigcontext_addr = alphaobsd_sigcontext_addr;
+
+  tdep->jb_pc = 2;
+  tdep->jb_elt_size = 8;
+
+  set_gdbarch_iterate_over_regset_sections
+    (gdbarch, alphanbsd_iterate_over_regset_sections);
+}
+
+
+/* Provide a prototype to silence -Wmissing-prototypes.  */
+void _initialize_alphaobsd_tdep (void);
+
+void
+_initialize_alphaobsd_tdep (void)
+{
+  gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_OPENBSD_ELF,
+                          alphaobsd_init_abi);
+}