* config/djgpp/fnchange.lst: Add translations for cpu-microblaze.c,

	elf32-microblaze.c, microblaze-rom.c, microblaze-linux-tdep.c,
	microblaze-tdep.h, microblaze-tdep.c, microblaze-opc.h,
	microblaze-opcm.h, microblaze-dis.c, microblaze-dis.h, sim/microblaze,
	microblaze.h, and microblaze.isa.
	* configure.tgt: Add targets microblaze*-linux-*, microblaze*-xilinx-*.
	* Makefile.in: Build microblaze-tdep.o, microblaze-linux-tdep.o.
	HFILES_NO_SRCDIR: Add microblaze-tdep.h.
	* microblaze-linux-tdep.c: New.
	* microblaze-tdep.c: New.
	* microblaze-tdep.h: New.
	* NEWS: Announce Xilinx MicroBlaze support.

1 files changed, 752 insertions, 0 deletions

diff --git a/gdb/microblaze-tdep.c b/gdb/microblaze-tdep.c
new file mode 100644
index 0000000..b008448
--- /dev/null
+++ b/gdb/microblaze-tdep.c
@@ -0,0 +1,752 @@
+/* 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 "arch-utils.h"
+#include "dis-asm.h"
+#include "frame.h"
+#include "trad-frame.h"
+#include "symtab.h"
+#include "value.h"
+#include "gdbcmd.h"
+#include "breakpoint.h"
+#include "inferior.h"
+#include "regcache.h"
+#include "target.h"
+#include "frame.h"
+#include "frame-base.h"
+#include "frame-unwind.h"
+#include "dwarf2-frame.h"
+#include "osabi.h"
+
+#include "gdb_assert.h"
+#include "gdb_string.h"
+#include "target-descriptions.h"
+#include "opcodes/microblaze-opcm.h"
+#include "opcodes/microblaze-dis.h"
+#include "microblaze-tdep.h"
+
+/* Instruction macros used for analyzing the prologue.  */
+/* This set of instruction macros need to be changed whenever the
+   prologue generated by the compiler could have more instructions or
+   different type of instructions.
+   This set also needs to be verified if it is complete.  */
+#define IS_RETURN(op) (op == rtsd || op == rtid)
+#define IS_UPDATE_SP(op, rd, ra) \
+	((op == addik || op == addi) && rd == REG_SP && ra == REG_SP)
+#define IS_SPILL_SP(op, rd, ra) \
+	((op == swi || op == sw) && rd == REG_SP && ra == REG_SP)
+#define IS_SPILL_REG(op, rd, ra) \
+	((op == swi || op == sw) && rd != REG_SP && ra == REG_SP)
+#define IS_ALSO_SPILL_REG(op, rd, ra, rb) \
+	((op == swi || op == sw) && rd != REG_SP && ra == 0 && rb == REG_SP)
+#define IS_SETUP_FP(op, ra, rb) \
+	((op == add || op == addik || op == addk) && ra == REG_SP && rb == 0)
+#define IS_SPILL_REG_FP(op, rd, ra, fpregnum) \
+	((op == swi || op == sw) && rd != REG_SP && ra == fpregnum && ra != 0)
+#define IS_SAVE_HIDDEN_PTR(op, rd, ra, rb) \
+	((op == add || op == addik) && ra == MICROBLAZE_FIRST_ARGREG && rb == 0)
+
+/* All registers are 32 bits.  */
+#define MICROBLAZE_REGISTER_SIZE 4
+
+/* The registers of the Xilinx microblaze processor.  */
+
+static const char *microblaze_register_names[] =
+{
+  "r0",   "r1",  "r2",    "r3",   "r4",   "r5",   "r6",   "r7",
+  "r8",   "r9",  "r10",   "r11",  "r12",  "r13",  "r14",  "r15",
+  "r16",  "r17", "r18",   "r19",  "r20",  "r21",  "r22",  "r23",
+  "r24",  "r25", "r26",   "r27",  "r28",  "r29",  "r30",  "r31",
+  "rpc",  "rmsr", "rear", "resr", "rfsr", "rbtr",
+  "rpvr0", "rpvr1", "rpvr2", "rpvr3", "rpvr4", "rpvr5", "rpvr6",
+  "rpvr7", "rpvr8", "rpvr9", "rpvr10", "rpvr11",
+  "redr", "rpid", "rzpr", "rtlbx", "rtlbsx", "rtlblo", "rtlbhi"
+};
+
+#define MICROBLAZE_NUM_REGS ARRAY_SIZE (microblaze_register_names)
+
+static int microblaze_debug_flag = 0;
+
+void
+microblaze_debug (const char *fmt, ...)
+{ 
+  if (microblaze_debug_flag)
+    {
+       va_list args;
+
+       va_start (args, fmt);
+       printf_unfiltered ("MICROBLAZE: ");
+       vprintf_unfiltered (fmt, args);
+       va_end (args);
+    }
+}
+
+/* Return the name of register REGNUM.  */
+
+static const char *
+microblaze_register_name (struct gdbarch *gdbarch, int regnum)
+{
+  if (regnum >= 0 && regnum < MICROBLAZE_NUM_REGS)
+    return microblaze_register_names[regnum];
+  return NULL;
+}
+
+static struct type *
+microblaze_register_type (struct gdbarch *gdbarch, int regnum)
+{
+  if (regnum == MICROBLAZE_SP_REGNUM)
+    return builtin_type (gdbarch)->builtin_data_ptr;
+
+  if (regnum == MICROBLAZE_PC_REGNUM)
+    return builtin_type (gdbarch)->builtin_func_ptr;
+
+  return builtin_type (gdbarch)->builtin_int;
+}
+
+
+/* Fetch the instruction at PC.  */
+
+unsigned long
+microblaze_fetch_instruction (CORE_ADDR pc)
+{
+  enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch);
+  gdb_byte buf[4];
+
+  /* If we can't read the instruction at PC, return zero.  */
+  if (target_read_memory (pc, buf, sizeof (buf)))
+    return 0;
+
+  return extract_unsigned_integer (buf, 4, byte_order);
+}
+
+
+static CORE_ADDR
+microblaze_push_dummy_code (struct gdbarch *gdbarch, CORE_ADDR sp,
+			    CORE_ADDR funcaddr,
+			    struct value **args, int nargs,
+			    struct type *value_type,
+			    CORE_ADDR *real_pc, CORE_ADDR *bp_addr,
+			    struct regcache *regcache)
+{
+  error (_("push_dummy_code not implemented"));
+  return sp;
+}
+
+
+static CORE_ADDR
+microblaze_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
+			    struct regcache *regcache, CORE_ADDR bp_addr,
+			    int nargs, struct value **args, CORE_ADDR sp,
+			    int struct_return, CORE_ADDR struct_addr)
+{
+  error (_("store_arguments not implemented"));
+  return sp;
+}
+
+static const gdb_byte *
+microblaze_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pc, 
+			       int *len)
+{
+  static gdb_byte break_insn[] = MICROBLAZE_BREAKPOINT;
+
+  *len = sizeof (break_insn);
+  return break_insn;
+}
+
+/* Allocate and initialize a frame cache.  */
+
+static struct microblaze_frame_cache *
+microblaze_alloc_frame_cache (void)
+{
+  struct microblaze_frame_cache *cache;
+  int i;
+
+  cache = FRAME_OBSTACK_ZALLOC (struct microblaze_frame_cache);
+
+  /* Base address.  */
+  cache->base = 0;
+  cache->pc = 0;
+
+  /* Frameless until proven otherwise.  */
+  cache->frameless_p = 1;
+
+  return cache;
+}
+
+/* The base of the current frame is actually in the stack pointer.
+   This happens when there is no frame pointer (microblaze ABI does not
+   require a frame pointer) or when we're stopped in the prologue or
+   epilogue itself.  In these cases, microblaze_analyze_prologue will need
+   to update fi->frame before returning or analyzing the register
+   save instructions.  */
+#define MICROBLAZE_MY_FRAME_IN_SP 0x1
+
+/* The base of the current frame is in a frame pointer register.
+   This register is noted in frame_extra_info->fp_regnum.
+
+   Note that the existance of an FP might also indicate that the
+   function has called alloca.  */
+#define MICROBLAZE_MY_FRAME_IN_FP 0x2
+
+/* Function prologues on the Xilinx microblaze processors consist of:
+
+   - adjustments to the stack pointer (r1) (addi r1, r1, imm)
+   - making a copy of r1 into another register (a "frame" pointer)
+     (add r?, r1, r0)
+   - store word/multiples that use r1 or the frame pointer as the
+     base address (swi r?, r1, imm OR swi r?, fp, imm)
+
+   Note that microblaze really doesn't have a real frame pointer.
+   Instead, the compiler may copy the SP into a register (usually
+   r19) to act as an arg pointer.  For our target-dependent purposes,
+   the frame info's "frame" member will be the beginning of the
+   frame.  The SP could, in fact, point below this.
+
+   The prologue ends when an instruction fails to meet either of
+   these criteria.  */
+
+/* Analyze the prologue to determine where registers are saved,
+   the end of the prologue, etc.  Return the address of the first line
+   of "real" code (i.e., the end of the prologue). */
+
+static CORE_ADDR
+microblaze_analyze_prologue (struct gdbarch *gdbarch, CORE_ADDR pc, 
+			     CORE_ADDR current_pc,
+			     struct microblaze_frame_cache *cache)
+{
+  char *name;
+  CORE_ADDR func_addr, func_end, addr, stop, prologue_end_addr = 0;
+  unsigned long insn;
+  int rn, rd, ra, rb, imm;
+  enum microblaze_instr op;
+  int flags = 0;
+  int save_hidden_pointer_found = 0;
+  int non_stack_instruction_found = 0;
+
+  /* Find the start of this function. */
+  find_pc_partial_function (pc, &name, &func_addr, &func_end);
+  if (func_addr < pc)
+    pc = func_addr;
+
+  if (current_pc < pc)
+    return current_pc;
+
+   /* Initialize info about frame.  */
+   cache->framesize = 0;
+   cache->fp_regnum = MICROBLAZE_SP_REGNUM;
+   cache->frameless_p = 1;
+
+  /* Start decoding the prologue.  We start by checking two special cases:
+
+     1. We're about to return
+     2. We're at the first insn of the prologue.
+
+     If we're about to return, our frame has already been deallocated.
+     If we are stopped at the first instruction of a prologue,
+     then our frame has not yet been set up. */
+
+  /* Get the first insn from memory.  */
+
+  insn = microblaze_fetch_instruction (pc);
+  op = microblaze_decode_insn (insn, &rd, &ra, &rb, &imm);
+
+  if (IS_RETURN(op))
+    return pc;
+
+  /* Start at beginning of function and analyze until we get to the
+     current pc, or the end of the function, whichever is first.  */
+  stop = (current_pc < func_end ? current_pc : func_end);
+
+  microblaze_debug ("Scanning prologue: name=%s, func_addr=%s, stop=%s\n", 
+		    name, paddress (gdbarch, func_addr), 
+		    paddress (gdbarch, stop));
+
+  for (addr = func_addr; addr < stop; addr += INST_WORD_SIZE)
+    {
+      insn = microblaze_fetch_instruction (addr);
+      op = microblaze_decode_insn (insn, &rd, &ra, &rb, &imm);
+      microblaze_debug ("%s %08lx\n", paddress (gdbarch, pc), insn);
+
+      /* This code is very sensitive to what functions are present in the
+	 prologue.  It assumes that the (addi, addik, swi, sw) can be the 
+	 only instructions in the prologue.  */
+      if (IS_UPDATE_SP(op, rd, ra))
+	{
+	  microblaze_debug ("got addi r1,r1,%d; contnuing\n", imm);
+	  if (cache->framesize)
+	    break;	/* break if framesize already computed.  */
+	  cache->framesize = -imm; /* stack grows towards low memory.  */
+	  cache->frameless_p = 0; /* Frame found.  */
+	  save_hidden_pointer_found = 0;
+	  non_stack_instruction_found = 0;
+	  continue;
+	}
+      else if (IS_SPILL_SP(op, rd, ra))
+	{
+	  /* Spill stack pointer.  */
+	  cache->register_offsets[rd] = imm; /* SP spilled before updating.  */
+
+	  microblaze_debug ("swi r1 r1 %d, continuing\n", imm);
+	  save_hidden_pointer_found = 0;
+	  if (!cache->framesize)
+	    non_stack_instruction_found = 0;
+	  continue;
+	}
+      else if (IS_SPILL_REG(op, rd, ra))
+	{
+	  /* Spill register.  */
+	  cache->register_offsets[rd] = imm - cache->framesize;
+
+	  microblaze_debug ("swi %d r1 %d, continuing\n", rd, imm);
+	  save_hidden_pointer_found = 0;
+	  if (!cache->framesize)
+	    non_stack_instruction_found = 0;
+	  continue;
+	}
+      else if (IS_ALSO_SPILL_REG(op, rd, ra, rb))
+	{
+	  /* Spill register.  */
+	  cache->register_offsets[rd] = 0 - cache->framesize;
+
+	  microblaze_debug ("sw %d r0 r1, continuing\n", rd);
+	  save_hidden_pointer_found = 0;
+	  if (!cache->framesize)
+	    non_stack_instruction_found = 0;
+	  continue;
+	}
+      else if (IS_SETUP_FP(op, ra, rb))
+	{
+	  /* We have a frame pointer.  Note the register which is 
+             acting as the frame pointer. */
+	  flags |= MICROBLAZE_MY_FRAME_IN_FP;
+	  flags &= ~MICROBLAZE_MY_FRAME_IN_SP;
+	  cache->fp_regnum = rd;
+	  microblaze_debug ("Found a frame pointer: r%d\n", cache->fp_regnum);
+	  save_hidden_pointer_found = 0;
+	  if (!cache->framesize)
+	    non_stack_instruction_found = 0;
+	  continue;
+	}
+      else if (IS_SPILL_REG_FP(op, rd, ra, cache->fp_regnum))
+	{
+	  /* reg spilled after updating.  */
+	  cache->register_offsets[rd] = imm - cache->framesize;
+
+	  microblaze_debug ("swi %d %d %d, continuing\n", rd, ra, imm);
+	  save_hidden_pointer_found = 0;
+	  if (!cache->framesize)
+	    non_stack_instruction_found = 0;
+	  continue;
+	}
+      else if (IS_SAVE_HIDDEN_PTR(op, rd, ra, rb))
+	{
+	  /* If the first argument is a hidden pointer to the area where the
+	     return structure is to be saved, then it is saved as part of the
+	     prologue.  */
+
+	  microblaze_debug ("add %d %d %d, continuing\n", rd, ra, rb);
+	  save_hidden_pointer_found = 1;
+	  if (!cache->framesize)
+	    non_stack_instruction_found = 0;
+	  continue;
+	}
+
+      /* As a result of the modification in the next step where we continue
+	 to analyze the prologue till we reach a control flow instruction,
+	 we need another variable to store when exactly a non-stack
+	 instruction was encountered, which is the current definition
+	 of a prologue.  */
+      if (!non_stack_instruction_found)
+	prologue_end_addr = addr;
+      non_stack_instruction_found = 1;
+
+      /* When optimizations are enabled, it is not guaranteed that prologue
+	 instructions are not mixed in with other instructions from the
+	 program. Some programs show this behavior at -O2. This can be
+	 avoided by adding -fno-schedule-insns2 switch as of now (edk 8.1)
+	 In such cases, we scan the function until we see the first control
+	 instruction.  */
+
+      {
+	unsigned op = (unsigned)insn >> 26;
+
+	/* continue if not control flow (branch, return).  */
+	if (op != 0x26 && op != 0x27 && op != 0x2d && op != 0x2e && op != 0x2f)
+	  continue;
+	else if (op == 0x2c)
+	  continue;    /* continue if imm.  */
+      }
+
+      /* This is not a prologue insn, so stop here. */
+      microblaze_debug ("insn is not a prologue insn -- ending scan\n");
+      break;
+    }
+
+  microblaze_debug ("done analyzing prologue\n");
+  microblaze_debug ("prologue end = 0x%x\n", (int) addr);
+
+  /* If the last instruction was an add rd, r5, r0 then don't count it as
+     part of the prologue.  */
+  if (save_hidden_pointer_found)
+    prologue_end_addr -= INST_WORD_SIZE;
+
+  return prologue_end_addr;
+}
+
+static CORE_ADDR
+microblaze_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
+{
+  gdb_byte buf[4];
+  CORE_ADDR pc;
+
+  frame_unwind_register (next_frame, MICROBLAZE_PC_REGNUM, buf);
+  pc = extract_typed_address (buf, builtin_type (gdbarch)->builtin_func_ptr);
+  /* For sentinel frame, return address is actual PC.  For other frames,
+     return address is pc+8.  This is a workaround because gcc does not
+     generate correct return address in CIE.  */
+  if (frame_relative_level (next_frame) >= 0)
+    pc += 8;
+  return pc;
+}
+
+/* Return PC of first real instruction of the function starting at
+   START_PC.  */
+
+CORE_ADDR
+microblaze_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR start_pc)
+{
+  struct symtab_and_line sal;
+  CORE_ADDR func_start, func_end, ostart_pc;
+  struct microblaze_frame_cache cache;
+
+  /* This is the preferred method, find the end of the prologue by
+     using the debugging information.  Debugging info does not always
+     give the right answer since parameters are stored on stack after this.
+     Always analyze the prologue.  */
+  if (find_pc_partial_function (start_pc, NULL, &func_start, &func_end))
+    {
+      sal = find_pc_line (func_start, 0);
+
+      if (sal.end < func_end
+	  && start_pc <= sal.end)
+	start_pc = sal.end;
+    }
+
+  ostart_pc = microblaze_analyze_prologue (gdbarch, func_start, 0xffffffffUL, 
+					   &cache);
+
+  if (ostart_pc > start_pc)
+    return ostart_pc;
+  return start_pc;
+}
+
+/* Normal frames.  */
+
+struct microblaze_frame_cache *
+microblaze_frame_cache (struct frame_info *next_frame, void **this_cache)
+{
+  struct microblaze_frame_cache *cache;
+  struct gdbarch *gdbarch = get_frame_arch (next_frame);
+  CORE_ADDR func, pc, fp;
+  int rn;
+
+  if (*this_cache)
+    return *this_cache;
+
+  cache = microblaze_alloc_frame_cache ();
+  *this_cache = cache;
+  cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
+
+  /* Clear offsets to saved regs in frame.  */
+  for (rn = 0; rn < gdbarch_num_regs (gdbarch); rn++)
+    cache->register_offsets[rn] = -1;
+
+  func = get_frame_func (next_frame);
+
+  cache->pc = get_frame_address_in_block (next_frame);
+
+  return cache;
+}
+
+static void
+microblaze_frame_this_id (struct frame_info *next_frame, void **this_cache,
+		       struct frame_id *this_id)
+{
+  struct microblaze_frame_cache *cache =
+    microblaze_frame_cache (next_frame, this_cache);
+
+  /* This marks the outermost frame.  */
+  if (cache->base == 0)
+    return;
+
+  (*this_id) = frame_id_build (cache->base, cache->pc);
+}
+
+static struct value *
+microblaze_frame_prev_register (struct frame_info *this_frame,
+				 void **this_cache, int regnum)
+{
+  struct microblaze_frame_cache *cache =
+    microblaze_frame_cache (this_frame, this_cache);
+
+  if (cache->frameless_p)
+    {
+      if (regnum == MICROBLAZE_PC_REGNUM)
+        regnum = 15;
+      if (regnum == MICROBLAZE_SP_REGNUM)
+        regnum = 1;
+      return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum);
+    }
+  else
+    return trad_frame_get_prev_register (this_frame, cache->saved_regs,
+					 regnum);
+
+}
+
+static const struct frame_unwind microblaze_frame_unwind =
+{
+  NORMAL_FRAME,
+  microblaze_frame_this_id,
+  microblaze_frame_prev_register,
+  NULL,
+  default_frame_sniffer
+};
+
+static CORE_ADDR
+microblaze_frame_base_address (struct frame_info *next_frame, void **this_cache)
+{
+  struct microblaze_frame_cache *cache =
+    microblaze_frame_cache (next_frame, this_cache);
+
+  return cache->base;
+}
+
+static const struct frame_base microblaze_frame_base =
+{
+  &microblaze_frame_unwind,
+  microblaze_frame_base_address,
+  microblaze_frame_base_address,
+  microblaze_frame_base_address
+};
+
+/* Extract from an array REGBUF containing the (raw) register state, a
+   function return value of TYPE, and copy that into VALBUF.  */
+static void
+microblaze_extract_return_value (struct type *type, struct regcache *regcache,
+				 gdb_byte *valbuf)
+{
+  gdb_byte buf[8];
+
+  /* Copy the return value (starting) in RETVAL_REGNUM to VALBUF.  */
+  switch (TYPE_LENGTH (type))
+    {
+      case 1:	/* return last byte in the register.  */
+	regcache_cooked_read (regcache, MICROBLAZE_RETVAL_REGNUM, buf);
+	memcpy(valbuf, buf + MICROBLAZE_REGISTER_SIZE - 1, 1);
+	return;
+      case 2:	/* return last 2 bytes in register.  */
+	memcpy(valbuf, buf + MICROBLAZE_REGISTER_SIZE - 2, 2);
+	return;
+      case 4:	/* for sizes 4 or 8, copy the required length.  */
+      case 8:
+	regcache_cooked_read (regcache, MICROBLAZE_RETVAL_REGNUM, buf);
+	regcache_cooked_read (regcache, MICROBLAZE_RETVAL_REGNUM+1, buf+4);
+	memcpy (valbuf, buf, TYPE_LENGTH (type));
+	return;
+      default:
+	internal_error (__FILE__, __LINE__, 
+			_("Unsupported return value size requested"));
+    }
+}
+
+/* Store the return value in VALBUF (of type TYPE) where the caller
+   expects to see it.
+
+   Integers up to four bytes are stored in r3.
+
+   Longs are stored in r3 (most significant word) and r4 (least
+   significant word).
+
+   Small structures are always returned on stack.
+*/
+
+static void
+microblaze_store_return_value (struct type *type, struct regcache *regcache,
+			       const gdb_byte *valbuf)
+{
+  int len = TYPE_LENGTH (type);
+  gdb_byte buf[8];
+
+  memset (buf, 0, sizeof(buf));
+
+  /* Integral and pointer return values.  */
+
+  if (len > 4)
+    {
+       gdb_assert (len == 8);
+       memcpy (buf, valbuf, 8);
+       regcache_cooked_write (regcache, MICROBLAZE_RETVAL_REGNUM+1, buf + 4);
+    }
+  else
+    /* ??? Do we need to do any sign-extension here?  */
+    memcpy (buf + 4 - len, valbuf, len);
+
+  regcache_cooked_write (regcache, MICROBLAZE_RETVAL_REGNUM, buf);
+}
+
+static enum return_value_convention
+microblaze_return_value (struct gdbarch *gdbarch, struct type *func_type,
+			 struct type *type, struct regcache *regcache,
+			 gdb_byte *readbuf, const gdb_byte *writebuf)
+{
+  if (readbuf)
+    microblaze_extract_return_value (type, regcache, readbuf);
+  if (writebuf)
+    microblaze_store_return_value (type, regcache, writebuf);
+
+  return RETURN_VALUE_REGISTER_CONVENTION;
+}
+
+static int
+microblaze_stabs_argument_has_addr (struct gdbarch *gdbarch, struct type *type)
+{
+  return (TYPE_LENGTH (type) == 16);
+}
+
+static void
+microblaze_write_pc (struct regcache *regcache, CORE_ADDR pc)
+{
+  regcache_cooked_write_unsigned (regcache, MICROBLAZE_PC_REGNUM, pc);
+}
+
+static int dwarf2_to_reg_map[78] =
+{ 0  /* r0  */,   1  /* r1  */,   2  /* r2  */,   3  /* r3  */,  /*  0- 3 */
+  4  /* r4  */,   5  /* r5  */,   6  /* r6  */,   7  /* r7  */,  /*  4- 7 */
+  8  /* r8  */,   9  /* r9  */,  10  /* r10 */,  11  /* r11 */,  /*  8-11 */
+  12 /* r12 */,  13  /* r13 */,  14  /* r14 */,  15  /* r15 */,  /* 12-15 */
+  16 /* r16 */,  17  /* r17 */,  18  /* r18 */,  19  /* r19 */,  /* 16-19 */
+  20 /* r20 */,  21  /* r21 */,  22  /* r22 */,  23  /* r23 */,  /* 20-23 */
+  24 /* r24 */,  25  /* r25 */,  26  /* r26 */,  27  /* r27 */,  /* 24-25 */
+  28 /* r28 */,  29  /* r29 */,  30  /* r30 */,  31  /* r31 */,  /* 28-31 */
+  -1 /* $f0 */,  -1  /* $f1 */,  -1  /* $f2 */,  -1  /* $f3 */,  /* 32-35 */
+  -1 /* $f4 */,  -1  /* $f5 */,  -1  /* $f6 */,  -1  /* $f7 */,  /* 36-39 */
+  -1 /* $f8 */,  -1  /* $f9 */,  -1  /* $f10 */, -1  /* $f11 */, /* 40-43 */
+  -1 /* $f12 */, -1  /* $f13 */, -1  /* $f14 */, -1  /* $f15 */, /* 44-47 */
+  -1 /* $f16 */, -1  /* $f17 */, -1  /* $f18 */, -1  /* $f19 */, /* 48-51 */
+  -1 /* $f20 */, -1  /* $f21 */, -1  /* $f22 */, -1  /* $f23 */, /* 52-55 */
+  -1 /* $f24 */, -1  /* $f25 */, -1  /* $f26 */, -1  /* $f27 */, /* 56-59 */
+  -1 /* $f28 */, -1  /* $f29 */, -1  /* $f30 */, -1  /* $f31 */, /* 60-63 */
+  -1 /* hi   */, -1  /* lo   */, -1  /* accum*/, 33  /* rmsr */, /* 64-67 */
+  -1 /* $fcc1*/, -1  /* $fcc2*/, -1  /* $fcc3*/, -1  /* $fcc4*/, /* 68-71 */
+  -1 /* $fcc5*/, -1  /* $fcc6*/, -1  /* $fcc7*/, -1  /* $ap  */, /* 72-75 */
+  -1 /* $rap */, -1  /* $frp */					 /* 76-77 */
+};
+
+static int
+microblaze_dwarf2_reg_to_regnum (struct gdbarch *gdbarch, int reg)
+{
+  gdb_assert (reg < sizeof (dwarf2_to_reg_map));
+  return dwarf2_to_reg_map[reg];
+}
+
+static struct gdbarch *
+microblaze_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
+{
+  struct gdbarch_tdep *tdep;
+  struct gdbarch *gdbarch;
+
+  /* If there is already a candidate, use it.  */
+  arches = gdbarch_list_lookup_by_info (arches, &info);
+  if (arches != NULL)
+    return arches->gdbarch;
+
+  /* Allocate space for the new architecture.  */
+  tdep = XMALLOC (struct gdbarch_tdep);
+  gdbarch = gdbarch_alloc (&info, tdep);
+
+  set_gdbarch_long_double_bit (gdbarch, 128);
+
+  set_gdbarch_num_regs (gdbarch, MICROBLAZE_NUM_REGS);
+  set_gdbarch_register_name (gdbarch, microblaze_register_name);
+  set_gdbarch_register_type (gdbarch, microblaze_register_type);
+
+  /* Register numbers of various important registers.  */
+  set_gdbarch_sp_regnum (gdbarch, MICROBLAZE_SP_REGNUM); 
+  set_gdbarch_pc_regnum (gdbarch, MICROBLAZE_PC_REGNUM); 
+
+  /* Map Dwarf2 registers to GDB registers.  */
+  set_gdbarch_dwarf2_reg_to_regnum (gdbarch, microblaze_dwarf2_reg_to_regnum);
+
+  /* Call dummy code.  */
+  set_gdbarch_call_dummy_location (gdbarch, ON_STACK);
+  set_gdbarch_push_dummy_code (gdbarch, microblaze_push_dummy_code);
+  set_gdbarch_push_dummy_call (gdbarch, microblaze_push_dummy_call);
+
+  set_gdbarch_return_value (gdbarch, microblaze_return_value);
+  set_gdbarch_stabs_argument_has_addr
+    (gdbarch, microblaze_stabs_argument_has_addr);
+
+  set_gdbarch_skip_prologue (gdbarch, microblaze_skip_prologue);
+
+  /* Stack grows downward.  */
+  set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
+
+  set_gdbarch_breakpoint_from_pc (gdbarch, microblaze_breakpoint_from_pc);
+
+  set_gdbarch_frame_args_skip (gdbarch, 8);
+
+  set_gdbarch_print_insn (gdbarch, print_insn_microblaze);
+
+  set_gdbarch_write_pc (gdbarch, microblaze_write_pc);
+
+  set_gdbarch_unwind_pc (gdbarch, microblaze_unwind_pc);
+
+  frame_base_set_default (gdbarch, &microblaze_frame_base);
+
+  /* Hook in ABI-specific overrides, if they have been registered.  */
+  gdbarch_init_osabi (info, gdbarch);
+
+  /* Unwind the frame. */
+  dwarf2_append_unwinders (gdbarch);
+  frame_unwind_append_unwinder (gdbarch, &microblaze_frame_unwind);
+  frame_base_append_sniffer (gdbarch, dwarf2_frame_base_sniffer);
+
+  return gdbarch;
+}
+
+/* Provide a prototype to silence -Wmissing-prototypes.  */
+void _initialize_microblaze_tdep (void);
+
+void
+_initialize_microblaze_tdep (void)
+{
+  register_gdbarch_init (bfd_arch_microblaze, microblaze_gdbarch_init);
+
+  /* Debug this files internals.  */
+  add_setshow_zinteger_cmd ("microblaze", class_maintenance,
+			    &microblaze_debug_flag, _("\
+Set microblaze debugging."), _("\
+Show microblaze debugging."), _("\
+When non-zero, microblaze specific debugging is enabled."),
+			    NULL,
+			    NULL, 
+			    &setdebuglist, &showdebuglist);
+
+}