2007-11-12 Markus Deuling <deuling@de.ibm.com>

[deliverable/binutils-gdb.git] / gdb / mips64obsd-tdep.c

diff --git a/gdb/mips64obsd-tdep.c b/gdb/mips64obsd-tdep.c
index 34ca830195f57ee0d0eef1da727201a26c8120cd..cc59634683b23d7c04c930a7bbf4284d92558458 100644 (file)
--- a/gdb/mips64obsd-tdep.c
+++ b/gdb/mips64obsd-tdep.c
@@ -1,12 +1,12 @@
 /* Target-dependent code for OpenBSD/mips64.
 
-   Copyright 2004 Free Software Foundation, Inc.
+   Copyright (C) 2004, 2007 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
+   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,
@@ -15,15 +15,16 @@
    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.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include "defs.h"
 #include "osabi.h"
 #include "regcache.h"
 #include "regset.h"
+#include "trad-frame.h"
+#include "tramp-frame.h"
 
+#include "gdb_assert.h"
 #include "gdb_string.h"
 
 #include "mips-tdep.h"
@@ -74,14 +75,80 @@ mips64obsd_regset_from_core_section (struct gdbarch *gdbarch,
 }
 \f
 
+/* Signal trampolines.  */
+
+static void
+mips64obsd_sigframe_init (const struct tramp_frame *self,
+                         struct frame_info *next_frame,
+                         struct trad_frame_cache *cache,
+                         CORE_ADDR func)
+{
+  struct gdbarch *gdbarch = get_frame_arch (next_frame);
+  CORE_ADDR sp, sigcontext_addr, addr;
+  int regnum;
+
+  /* We find the appropriate instance of `struct sigcontext' at a
+     fixed offset in the signal frame.  */
+  sp = frame_unwind_register_signed (next_frame,
+                                    MIPS_SP_REGNUM
+                                    + gdbarch_num_regs (gdbarch));
+  sigcontext_addr = sp + 32;
+
+  /* PC.  */
+  regnum = mips_regnum (gdbarch)->pc;
+  trad_frame_set_reg_addr (cache,
+                          regnum + gdbarch_num_regs (gdbarch),
+                           sigcontext_addr + 16);
+
+  /* GPRs.  */
+  for (regnum = MIPS_AT_REGNUM, addr = sigcontext_addr + 32;
+       regnum <= MIPS_RA_REGNUM; regnum++, addr += 8)
+    trad_frame_set_reg_addr (cache,
+                            regnum + gdbarch_num_regs (gdbarch),
+                            addr);
+
+  /* HI and LO.  */
+  regnum = mips_regnum (gdbarch)->lo;
+  trad_frame_set_reg_addr (cache,
+                          regnum + gdbarch_num_regs (gdbarch),
+                          sigcontext_addr + 280);
+  regnum = mips_regnum (gdbarch)->hi;
+  trad_frame_set_reg_addr (cache,
+                          regnum + gdbarch_num_regs (gdbarch),
+                          sigcontext_addr + 288);
+
+  /* TODO: Handle the floating-point registers.  */
+
+  trad_frame_set_id (cache, frame_id_build (sp, func));
+}
+
+static const struct tramp_frame mips64obsd_sigframe =
+{
+  SIGTRAMP_FRAME,
+  MIPS_INSN32_SIZE,
+  {
+    { 0x67a40020, -1 },                /* daddiu  a0,sp,32 */
+    { 0x24020067, -1 },                /* li      v0,103 */
+    { 0x0000000c, -1 },                /* syscall */
+    { 0x0000000d, -1 },                /* break */
+    { TRAMP_SENTINEL_INSN, -1 }
+  },
+  mips64obsd_sigframe_init
+};
+
+\f
 static void
 mips64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 {
+  /* OpenBSD/mips64 only supports the n64 ABI, but the braindamaged
+     way GDB works, forces us to pretend we can handle them all.  */
+
   set_gdbarch_regset_from_core_section
     (gdbarch, mips64obsd_regset_from_core_section);
 
-  set_gdbarch_software_single_step (gdbarch, mips_software_single_step);
+  tramp_frame_prepend_unwinder (gdbarch, &mips64obsd_sigframe);
 
+  /* OpenBSD/mips64 has SVR4-style shared libraries.  */
   set_solib_svr4_fetch_link_map_offsets
     (gdbarch, svr4_lp64_fetch_link_map_offsets);
 }