1 files changed, 142 insertions, 0 deletions
diff --git a/gdb/microblaze-linux-tdep.c b/gdb/microblaze-linux-tdep.c
new file mode 100644
index 0000000..2b07d95
--- /dev/null
+++ b/gdb/microblaze-linux-tdep.c
@@ -0,0 +1,142 @@
+/* Target-dependent code for Xilinx MicroBlaze.
+
+   Copyright 2009 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 "inferior.h"
+#include "symtab.h"
+#include "target.h"
+#include "gdbcore.h"
+#include "gdbcmd.h"
+#include "symfile.h"
+#include "objfiles.h"
+#include "regcache.h"
+#include "value.h"
+#include "osabi.h"
+#include "regset.h"
+#include "solib-svr4.h"
+#include "microblaze-tdep.h"
+#include "trad-frame.h"
+#include "frame-unwind.h"
+#include "tramp-frame.h"
+
+
+static int
+microblaze_linux_memory_remove_breakpoint (struct bp_target_info *bp_tgt)
+{
+  CORE_ADDR addr = bp_tgt->placed_address;
+  const gdb_byte *bp;
+  int val;
+  int bplen;
+  gdb_byte old_contents[BREAKPOINT_MAX];
+
+  /* Determine appropriate breakpoint contents and size for this address.  */
+  bp = gdbarch_breakpoint_from_pc (gdbarch, &addr, &bplen);
+  if (bp == NULL)
+    error (_("Software breakpoints not implemented for this target."));
+
+  val = target_read_memory (addr, old_contents, bplen);
+
+  /* If our breakpoint is no longer at the address, this means that the
+     program modified the code on us, so it is wrong to put back the
+     old value.  */
+  if (val == 0 && memcmp (bp, old_contents, bplen) == 0)
+    val = target_write_memory (addr, bp_tgt->shadow_contents, bplen);
+
+  return val;
+}
+
+static void
+microblaze_linux_sigtramp_cache (struct frame_info *next_frame,
+				 struct trad_frame_cache *this_cache,
+				 CORE_ADDR func, LONGEST offset,
+				 int bias)
+{
+  CORE_ADDR base;
+  CORE_ADDR gpregs;
+  int regnum;
+  struct gdbarch *gdbarch = get_frame_arch (next_frame);
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  base = frame_unwind_register_unsigned (next_frame, SP_REGNUM);
+  if (bias > 0 && frame_pc_unwind (next_frame) != func)
+    /* See below, some signal trampolines increment the stack as their
+       first instruction, need to compensate for that.  */
+    base -= bias;
+
+  /* Find the address of the register buffer.  */
+  gpregs = base + offset;
+
+  /* Registers saved on stack.  */
+  for (regnum = 0; regnum < MICROBLAZE_BTR_REGNUM; regnum++)
+    trad_frame_set_reg_addr (this_cache, regnum, 
+			     gpregs + regnum * MICROBLAZE_REGISTER_SIZE);
+  trad_frame_set_id (this_cache, frame_id_build (base, func));
+}
+
+
+static void
+microblaze_linux_sighandler_cache_init (const struct tramp_frame *self,
+					struct frame_info *next_frame,
+					struct trad_frame_cache *this_cache,
+					CORE_ADDR func)
+{
+  microblaze_linux_sigtramp_cache (next_frame, this_cache, func,
+				   0 /* Offset to ucontext_t.  */
+				   + 24 /* Offset to .reg.  */,
+				   0);
+}
+
+static struct tramp_frame microblaze_linux_sighandler_tramp_frame = 
+{
+  SIGTRAMP_FRAME,
+  4,
+  {
+    { 0x31800077, -1 }, /* addik R12,R0,119.  */
+    { 0xb9cc0008, -1 }, /* brki R14,8.  */
+    { TRAMP_SENTINEL_INSN },
+  },
+  microblaze_linux_sighandler_cache_init
+};
+
+
+static void
+microblaze_linux_init_abi (struct gdbarch_info info,
+			   struct gdbarch *gdbarch)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  set_gdbarch_memory_remove_breakpoint (gdbarch,
+					microblaze_linux_memory_remove_breakpoint);
+
+  /* Shared library handling.  */
+  set_solib_svr4_fetch_link_map_offsets (gdbarch,
+					 svr4_ilp32_fetch_link_map_offsets);
+
+  /* Trampolines.  */
+  tramp_frame_prepend_unwinder (gdbarch,
+				&microblaze_linux_sighandler_tramp_frame);
+}
+
+void
+_initialize_microblaze_linux_tdep (void)
+{
+  gdbarch_register_osabi (bfd_arch_microblaze, 0, GDB_OSABI_LINUX, 
+			  microblaze_linux_init_abi);
+}