Initial revision

1 files changed, 921 insertions, 0 deletions

diff --git a/gdb/h8300-tdep.c b/gdb/h8300-tdep.c
new file mode 100644
index 00000000000..3fbe9e1bb28
--- /dev/null
+++ b/gdb/h8300-tdep.c
@@ -0,0 +1,921 @@
+/* Target-machine dependent code for Hitachi H8/300, for GDB.
+   Copyright (C) 1988, 1990, 1991 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
+(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.  */
+
+/*
+ Contributed by Steve Chamberlain
+                sac@cygnus.com
+ */
+
+#include "defs.h"
+#include "frame.h"
+#include "obstack.h"
+#include "symtab.h"
+#include "dis-asm.h"
+#include "gdbcmd.h"
+#include "gdbtypes.h"
+#include "gdbcore.h"
+#include "gdb_string.h"
+#include "value.h"
+
+extern int h8300hmode, h8300smode;
+
+#undef NUM_REGS
+#define NUM_REGS 11
+
+#define UNSIGNED_SHORT(X) ((X) & 0xffff)
+
+#define IS_PUSH(x) ((x & 0xfff0)==0x6df0)
+#define IS_PUSH_FP(x) (x == 0x6df6)
+#define IS_MOVE_FP(x) (x == 0x0d76 || x == 0x0ff6)
+#define IS_MOV_SP_FP(x) (x == 0x0d76 || x == 0x0ff6)
+#define IS_SUB2_SP(x) (x==0x1b87)
+#define IS_SUB4_SP(x) (x==0x1b97)
+#define IS_SUBL_SP(x) (x==0x7a37)
+#define IS_MOVK_R5(x) (x==0x7905)
+#define IS_SUB_R5SP(x) (x==0x1957)
+
+
+/* The register names change depending on whether the h8300h processor
+   type is selected. */
+
+static char *original_register_names[] = REGISTER_NAMES;
+
+static char *h8300h_register_names[] =
+  {"er0", "er1", "er2", "er3", "er4", "er5", "er6",
+    "sp", "ccr","pc","cycles","tick","inst" };
+
+char **h8300_register_names = original_register_names;
+
+
+/* Local function declarations.  */
+
+static CORE_ADDR examine_prologue ();
+static void set_machine_hook PARAMS ((char *filename));
+
+void h8300_frame_find_saved_regs ();
+
+CORE_ADDR 
+h8300_skip_prologue (start_pc)
+     CORE_ADDR start_pc;
+{
+  short int w;
+  int adjust = 0;
+
+  /* Skip past all push and stm insns.  */
+  while (1)
+    {
+      w = read_memory_unsigned_integer (start_pc, 2);
+      /* First look for push insns.  */
+      if (w == 0x0100 || w == 0x0110 || w == 0x0120 || w == 0x0130)
+	{
+	  w = read_memory_unsigned_integer (start_pc + 2, 2);
+	  adjust = 2;
+	}
+
+      if (IS_PUSH (w))
+	{
+	  start_pc += 2 + adjust;
+	  w = read_memory_unsigned_integer (start_pc, 2);
+	  continue;
+	}
+      adjust = 0;
+      break;
+    }
+
+  /* Skip past a move to FP, either word or long sized */
+  w = read_memory_unsigned_integer (start_pc, 2);
+  if (w == 0x0100)
+    {
+      w = read_memory_unsigned_integer (start_pc + 2, 2);
+      adjust += 2;
+    }
+
+  if (IS_MOVE_FP (w))
+    {
+      start_pc += 2 + adjust;
+      w = read_memory_unsigned_integer (start_pc, 2);
+    }
+
+  /* Check for loading either a word constant into r5;
+     long versions are handled by the SUBL_SP below.  */
+  if (IS_MOVK_R5 (w))
+    {
+      start_pc += 2;
+      w = read_memory_unsigned_integer (start_pc, 2);
+    }
+
+  /* Now check for subtracting r5 from sp, word sized only.  */
+  if (IS_SUB_R5SP (w))
+    {
+      start_pc += 2 + adjust;
+      w = read_memory_unsigned_integer (start_pc, 2);
+    }
+
+  /* Check for subs #2 and subs #4. */
+  while (IS_SUB2_SP (w) || IS_SUB4_SP (w))
+    {
+      start_pc += 2 + adjust;
+      w = read_memory_unsigned_integer (start_pc, 2);
+    }
+
+  /* Check for a 32bit subtract.  */
+  if (IS_SUBL_SP (w))
+    start_pc += 6 + adjust;
+
+  return start_pc;
+}
+
+int
+gdb_print_insn_h8300 (memaddr, info)
+     bfd_vma memaddr;
+     disassemble_info *info;
+{
+  if (h8300smode)
+    return print_insn_h8300s (memaddr, info);
+  else if (h8300hmode)
+    return print_insn_h8300h (memaddr, info);
+  else
+    return print_insn_h8300 (memaddr, info);
+}
+
+/* Given a GDB frame, determine the address of the calling function's frame.
+   This will be used to create a new GDB frame struct, and then
+   INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame.
+
+   For us, the frame address is its stack pointer value, so we look up
+   the function prologue to determine the caller's sp value, and return it.  */
+
+CORE_ADDR
+h8300_frame_chain (thisframe)
+     struct frame_info *thisframe;
+{
+  if (PC_IN_CALL_DUMMY(thisframe->pc, thisframe->frame, thisframe->frame))
+    { /* initialize the from_pc now */
+      thisframe->from_pc = generic_read_register_dummy (thisframe->pc,
+							thisframe->frame, 
+							PC_REGNUM);
+      return thisframe->frame;
+    }
+  h8300_frame_find_saved_regs (thisframe, (struct frame_saved_regs *) 0);
+  return thisframe->fsr->regs[SP_REGNUM];
+}
+
+/* Put here the code to store, into a struct frame_saved_regs,
+   the addresses of the saved registers of frame described by FRAME_INFO.
+   This includes special registers such as pc and fp saved in special
+   ways in the stack frame.  sp is even more special:
+   the address we return for it IS the sp for the next frame.
+
+   We cache the result of doing this in the frame_obstack, since it is
+   fairly expensive.  */
+
+void
+h8300_frame_find_saved_regs (fi, fsr)
+     struct frame_info *fi;
+     struct frame_saved_regs *fsr;
+{
+  register struct frame_saved_regs *cache_fsr;
+  CORE_ADDR ip;
+  struct symtab_and_line sal;
+  CORE_ADDR limit;
+
+  if (!fi->fsr)
+    {
+      cache_fsr = (struct frame_saved_regs *)
+	frame_obstack_alloc (sizeof (struct frame_saved_regs));
+      memset (cache_fsr, '\0', sizeof (struct frame_saved_regs));
+
+      fi->fsr = cache_fsr;
+
+      if (PC_IN_CALL_DUMMY(fi->pc, fi->frame, fi->frame))
+	{	/* no more to do. */
+	  if (fsr)
+	    *fsr = *fi->fsr;
+	  return;
+	}
+      /* Find the start and end of the function prologue.  If the PC
+	 is in the function prologue, we only consider the part that
+	 has executed already.  */
+
+      ip = get_pc_function_start (fi->pc);
+      sal = find_pc_line (ip, 0);
+      limit = (sal.end && sal.end < fi->pc) ? sal.end : fi->pc;
+
+      /* This will fill in fields in *fi as well as in cache_fsr.  */
+      examine_prologue (ip, limit, fi->frame, cache_fsr, fi);
+    }
+
+  if (fsr)
+    *fsr = *fi->fsr;
+}
+
+/* Fetch the instruction at ADDR, returning 0 if ADDR is beyond LIM or
+   is not the address of a valid instruction, the address of the next
+   instruction beyond ADDR otherwise.  *PWORD1 receives the first word
+   of the instruction.*/
+
+CORE_ADDR
+NEXT_PROLOGUE_INSN (addr, lim, pword1)
+     CORE_ADDR addr;
+     CORE_ADDR lim;
+     INSN_WORD *pword1;
+{
+  char buf[2];
+  if (addr < lim + 8)
+    {
+      read_memory (addr, buf, 2);
+      *pword1 = extract_signed_integer (buf, 2);
+
+      return addr + 2;
+    }
+  return 0;
+}
+
+/* Examine the prologue of a function.  `ip' points to the first instruction.
+   `limit' is the limit of the prologue (e.g. the addr of the first
+   linenumber, or perhaps the program counter if we're stepping through).
+   `frame_sp' is the stack pointer value in use in this frame.
+   `fsr' is a pointer to a frame_saved_regs structure into which we put
+   info about the registers saved by this frame.
+   `fi' is a struct frame_info pointer; we fill in various fields in it
+   to reflect the offsets of the arg pointer and the locals pointer.  */
+
+static CORE_ADDR
+examine_prologue (ip, limit, after_prolog_fp, fsr, fi)
+     register CORE_ADDR ip;
+     register CORE_ADDR limit;
+     CORE_ADDR after_prolog_fp;
+     struct frame_saved_regs *fsr;
+     struct frame_info *fi;
+{
+  register CORE_ADDR next_ip;
+  int r;
+  int have_fp = 0;
+  INSN_WORD insn_word;
+  /* Number of things pushed onto stack, starts at 2/4, 'cause the
+     PC is already there */
+  unsigned int reg_save_depth = h8300hmode ? 4 : 2;
+
+  unsigned int auto_depth = 0;	/* Number of bytes of autos */
+
+  char in_frame[11];		/* One for each reg */
+
+  int adjust = 0;
+
+  memset (in_frame, 1, 11);
+  for (r = 0; r < 8; r++)
+    {
+      fsr->regs[r] = 0;
+    }
+  if (after_prolog_fp == 0)
+    {
+      after_prolog_fp = read_register (SP_REGNUM);
+    }
+
+  /* If the PC isn't valid, quit now.  */
+  if (ip == 0 || ip & (h8300hmode ? ~0xffffff : ~0xffff))
+    return 0;
+
+  next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
+
+  if (insn_word == 0x0100)
+    {
+      insn_word = read_memory_unsigned_integer (ip + 2, 2);
+      adjust = 2;
+    }
+
+  /* Skip over any fp push instructions */
+  fsr->regs[6] = after_prolog_fp;
+  while (next_ip && IS_PUSH_FP (insn_word))
+    {
+      ip = next_ip + adjust;
+
+      in_frame[insn_word & 0x7] = reg_save_depth;
+      next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
+      reg_save_depth += 2 + adjust;
+    }
+
+  /* Is this a move into the fp */
+  if (next_ip && IS_MOV_SP_FP (insn_word))
+    {
+      ip = next_ip;
+      next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
+      have_fp = 1;
+    }
+
+  /* Skip over any stack adjustment, happens either with a number of
+     sub#2,sp or a mov #x,r5 sub r5,sp */
+
+  if (next_ip && (IS_SUB2_SP (insn_word) || IS_SUB4_SP (insn_word)))
+    {
+      while (next_ip && (IS_SUB2_SP (insn_word) || IS_SUB4_SP (insn_word)))
+	{
+	  auto_depth += IS_SUB2_SP (insn_word) ? 2 : 4;
+	  ip = next_ip;
+	  next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
+	}
+    }
+  else
+    {
+      if (next_ip && IS_MOVK_R5 (insn_word))
+	{
+	  ip = next_ip;
+	  next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
+	  auto_depth += insn_word;
+
+	  next_ip = NEXT_PROLOGUE_INSN (next_ip, limit, &insn_word);
+	  auto_depth += insn_word;
+	}
+      if (next_ip && IS_SUBL_SP (insn_word))
+	{
+	  ip = next_ip;
+	  auto_depth += read_memory_unsigned_integer (ip, 4);
+	  ip += 4;
+
+	  next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
+	}
+    }
+
+  /* Now examine the push insns to determine where everything lives
+     on the stack.  */
+  while (1)
+    {
+      adjust = 0;
+      if (!next_ip)
+	break;
+
+      if (insn_word == 0x0100)
+	{
+	  ip = next_ip;
+	  next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
+	  adjust = 2;
+	}
+
+      if (IS_PUSH (insn_word))
+	{
+	  ip = next_ip;
+	  next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
+	  fsr->regs[r] = after_prolog_fp + auto_depth;
+	  auto_depth += 2 + adjust;
+	  continue;
+	}
+
+      /* Now check for push multiple insns.  */
+      if (insn_word == 0x0110 || insn_word == 0x0120 || insn_word == 0x0130)
+	{
+	  int count = ((insn_word >> 4) & 0xf) + 1;
+	  int start, i;
+
+	  ip = next_ip;
+	  next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
+	  start = insn_word & 0x7;
+
+	  for (i = start; i <= start + count; i++)
+	    {
+	      fsr->regs[i] = after_prolog_fp + auto_depth;
+	      auto_depth += 4;
+	    }
+	}
+      break;
+    }
+
+  /* The args are always reffed based from the stack pointer */
+  fi->args_pointer = after_prolog_fp;
+  /* Locals are always reffed based from the fp */
+  fi->locals_pointer = after_prolog_fp;
+  /* The PC is at a known place */
+  fi->from_pc = read_memory_unsigned_integer (after_prolog_fp + BINWORD, BINWORD);
+
+  /* Rememeber any others too */
+  in_frame[PC_REGNUM] = 0;
+  
+  if (have_fp)
+    /* We keep the old FP in the SP spot */
+    fsr->regs[SP_REGNUM] = read_memory_unsigned_integer (fsr->regs[6], BINWORD);
+  else
+    fsr->regs[SP_REGNUM] = after_prolog_fp + auto_depth;
+
+  return (ip);
+}
+
+void
+h8300_init_extra_frame_info (fromleaf, fi)
+     int fromleaf;
+     struct frame_info *fi;
+{
+  fi->fsr = 0;			/* Not yet allocated */
+  fi->args_pointer = 0;		/* Unknown */
+  fi->locals_pointer = 0;	/* Unknown */
+  fi->from_pc = 0;
+  if (PC_IN_CALL_DUMMY(fi->pc, fi->frame, fi->frame))
+    { /* anything special to do? */
+      return;
+    }
+}
+
+/* Return the saved PC from this frame.
+
+   If the frame has a memory copy of SRP_REGNUM, use that.  If not,
+   just use the register SRP_REGNUM itself.  */
+
+CORE_ADDR
+h8300_frame_saved_pc (frame)
+     struct frame_info *frame;
+{
+  if (PC_IN_CALL_DUMMY(frame->pc, frame->frame, frame->frame))
+    return generic_read_register_dummy (frame->pc, frame->frame, PC_REGNUM);
+  else
+    return frame->from_pc;
+}
+
+CORE_ADDR
+frame_locals_address (fi)
+     struct frame_info *fi;
+{
+  if (PC_IN_CALL_DUMMY(fi->pc, fi->frame, fi->frame))
+    return (CORE_ADDR) 0;	/* Not sure what else to do... */
+  if (!fi->locals_pointer)
+    {
+      struct frame_saved_regs ignore;
+
+      get_frame_saved_regs (fi, &ignore);
+
+    }
+  return fi->locals_pointer;
+}
+
+/* Return the address of the argument block for the frame
+   described by FI.  Returns 0 if the address is unknown.  */
+
+CORE_ADDR
+frame_args_address (fi)
+     struct frame_info *fi;
+{
+  if (PC_IN_CALL_DUMMY(fi->pc, fi->frame, fi->frame))
+    return (CORE_ADDR) 0;	/* Not sure what else to do... */
+  if (!fi->args_pointer)
+    {
+      struct frame_saved_regs ignore;
+
+      get_frame_saved_regs (fi, &ignore);
+
+    }
+
+  return fi->args_pointer;
+}
+
+/* Function: push_arguments
+   Setup the function arguments for calling a function in the inferior.
+
+   On the Hitachi H8/300 architecture, there are three registers (R0 to R2)
+   which are dedicated for passing function arguments.  Up to the first
+   three arguments (depending on size) may go into these registers.
+   The rest go on the stack.
+
+   Arguments that are smaller than WORDSIZE bytes will still take up a
+   whole register or a whole WORDSIZE word on the stack, and will be
+   right-justified in the register or the stack word.  This includes
+   chars and small aggregate types.  Note that WORDSIZE depends on the 
+   cpu type.
+
+   Arguments that are larger than WORDSIZE bytes will be split between
+   two or more registers as available, but will NOT be split between a
+   register and the stack.
+
+   An exceptional case exists for struct arguments (and possibly other
+   aggregates such as arrays) -- if the size is larger than WORDSIZE
+   bytes but not a multiple of WORDSIZE bytes.  In this case the
+   argument is never split between the registers and the stack, but
+   instead is copied in its entirety onto the stack, AND also copied
+   into as many registers as there is room for.  In other words, space
+   in registers permitting, two copies of the same argument are passed
+   in.  As far as I can tell, only the one on the stack is used,
+   although that may be a function of the level of compiler
+   optimization.  I suspect this is a compiler bug.  Arguments of
+   these odd sizes are left-justified within the word (as opposed to
+   arguments smaller than WORDSIZE bytes, which are right-justified).
+ 
+   If the function is to return an aggregate type such as a struct,
+   the caller must allocate space into which the callee will copy the
+   return value.  In this case, a pointer to the return value location
+   is passed into the callee in register R0, which displaces one of
+   the other arguments passed in via registers R0 to R2.  */
+
+CORE_ADDR
+h8300_push_arguments(nargs, args, sp, struct_return, struct_addr)
+     int nargs;
+     struct value **args;
+     CORE_ADDR sp;
+     unsigned char struct_return;
+     CORE_ADDR struct_addr;
+{
+  int stack_align, stack_alloc, stack_offset;
+  int wordsize;
+  int argreg;
+  int argnum;
+  struct type *type;
+  CORE_ADDR regval;
+  char *val;
+  char valbuf[4];
+  int len;
+
+  if (h8300hmode || h8300smode)
+    {
+      stack_align = 3;
+      wordsize    = 4;
+    }
+  else
+    {
+      stack_align = 1;
+      wordsize    = 2;
+    }
+
+  /* first force sp to a n-byte alignment */
+  sp = sp & ~stack_align;
+
+  /* Now make sure there's space on the stack */
+  for (argnum = 0, stack_alloc = 0; 
+       argnum < nargs; argnum++)
+    stack_alloc += ((TYPE_LENGTH(VALUE_TYPE(args[argnum])) + stack_align) 
+		    & ~stack_align);
+  sp -= stack_alloc;	/* make room on stack for args */
+  /* we may over-allocate a little here, but that won't hurt anything */
+
+  argreg = ARG0_REGNUM; 
+  if (struct_return)	/* "struct return" pointer takes up one argreg */
+    {
+      write_register (argreg++, struct_addr);
+    }
+
+  /* Now load as many as possible of the first arguments into
+     registers, and push the rest onto the stack.  There are 3N bytes
+     in three registers available.  Loop thru args from first to last.  */
+
+  for (argnum = 0, stack_offset = 0; argnum < nargs; argnum++)
+    {
+      type = VALUE_TYPE (args[argnum]);
+      len = TYPE_LENGTH (type);
+      memset(valbuf, 0, sizeof(valbuf));
+      if (len < wordsize)
+	{
+	  /* the purpose of this is to right-justify the value within the word */
+	  memcpy(valbuf + (wordsize - len), 
+		 (char *) VALUE_CONTENTS (args[argnum]), len);
+	  val = valbuf;
+	}
+      else
+	val = (char *) VALUE_CONTENTS (args[argnum]);
+
+      if (len > (ARGLAST_REGNUM+1 - argreg) * REGISTER_RAW_SIZE(ARG0_REGNUM) ||
+	 (len > wordsize && (len & stack_align) != 0))
+	{ /* passed on the stack */
+	  write_memory (sp + stack_offset, val, 
+			len < wordsize ? wordsize : len);
+	  stack_offset += (len + stack_align) & ~stack_align;
+	}
+      /* NOTE WELL!!!!!  This is not an "else if" clause!!!
+	 That's because some *&^%$ things get passed on the stack
+	 AND in the registers!   */
+      if (len <= (ARGLAST_REGNUM+1 - argreg) * REGISTER_RAW_SIZE(ARG0_REGNUM))
+	while (len > 0)
+	  { /* there's room in registers */
+	    regval = extract_address (val, wordsize);
+	    write_register (argreg, regval);
+	    len -= wordsize;
+	    val += wordsize;
+	    argreg++;
+	  }
+    }
+  return sp;
+}
+
+/* Function: push_return_address
+   Setup the return address for a dummy frame, as called by
+   call_function_by_hand.  Only necessary when you are using an
+   empty CALL_DUMMY, ie. the target will not actually be executing
+   a JSR/BSR instruction.  */
+
+CORE_ADDR
+h8300_push_return_address (pc, sp)
+     CORE_ADDR pc;
+     CORE_ADDR sp;
+{
+  unsigned char buf[4];
+  int wordsize;
+
+  if (h8300hmode || h8300smode)
+    wordsize = 4;
+  else
+    wordsize = 2;
+
+  sp -= wordsize;
+  store_unsigned_integer (buf, wordsize, CALL_DUMMY_ADDRESS ());
+  write_memory (sp, buf, wordsize);
+  return sp;
+}
+
+/* Function: pop_frame
+   Restore the machine to the state it had before the current frame 
+   was created.  Usually used either by the "RETURN" command, or by
+   call_function_by_hand after the dummy_frame is finished. */
+
+void 
+h8300_pop_frame ()
+{
+  unsigned regnum;
+  struct frame_saved_regs fsr;
+  struct frame_info *frame = get_current_frame ();
+
+  if (PC_IN_CALL_DUMMY(frame->pc, frame->frame, frame->frame))
+    {
+      generic_pop_dummy_frame();
+    }
+  else
+    {
+      get_frame_saved_regs (frame, &fsr);
+
+      for (regnum = 0; regnum < 8; regnum++)
+	{
+	  /* Don't forget SP_REGNUM is a frame_saved_regs struct is the
+	     actual value we want, not the address of the value we want.  */
+	  if (fsr.regs[regnum] && regnum != SP_REGNUM)
+	    write_register (regnum, 
+			    read_memory_integer(fsr.regs[regnum], BINWORD));
+	  else if (fsr.regs[regnum] && regnum == SP_REGNUM)
+	    write_register (regnum, frame->frame + 2 * BINWORD);
+	}
+
+      /* Don't forget the update the PC too!  */
+      write_pc (frame->from_pc);
+    }
+  flush_cached_frames ();
+}
+
+/* Function: extract_return_value
+   Figure out where in REGBUF the called function has left its return value.
+   Copy that into VALBUF.  Be sure to account for CPU type.   */
+
+void
+h8300_extract_return_value (type, regbuf, valbuf)
+     struct type *type;
+     char *regbuf;
+     char *valbuf;
+{
+  int wordsize, len;
+
+  if (h8300smode || h8300hmode)
+    wordsize = 4;
+  else
+    wordsize = 2;
+
+  len = TYPE_LENGTH(type);
+
+  switch (len) {
+  case 1:	/* (char) */
+  case 2:	/* (short), (int) */
+    memcpy (valbuf,   regbuf + REGISTER_BYTE(0) + (wordsize - len), len);
+    break;
+  case 4:	/* (long), (float) */
+    if (h8300smode || h8300hmode)
+      {
+	memcpy (valbuf,   regbuf + REGISTER_BYTE(0), 4);
+      }
+    else
+      {
+	memcpy (valbuf,   regbuf + REGISTER_BYTE(0), 2);
+	memcpy (valbuf+2, regbuf + REGISTER_BYTE(1), 2);
+      }
+    break;
+  case 8:	/* (double) (doesn't seem to happen, which is good,
+		   because this almost certainly isn't right.  */
+    error ("I don't know how a double is returned.");
+    break;
+  }
+}
+
+/* Function: store_return_value
+   Place the appropriate value in the appropriate registers.
+   Primarily used by the RETURN command.  */
+
+void 
+h8300_store_return_value (type, valbuf)
+     struct type *type;
+     char *valbuf;
+{
+  int wordsize, len, regval;
+  
+  if (h8300hmode || h8300smode)
+    wordsize = 4;
+  else
+    wordsize = 2;
+
+  len = TYPE_LENGTH(type);
+  switch (len) {
+  case 1:	/* char */
+  case 2:	/* short, int */
+    regval = extract_address(valbuf, len);
+    write_register (0, regval);
+    break;
+  case 4:	/* long, float */
+    regval = extract_address(valbuf, len);
+    if (h8300smode || h8300hmode)
+      {
+	write_register (0, regval);
+      }
+    else
+      {
+	write_register (0, regval >> 16);
+	write_register (1, regval & 0xffff);
+      }
+    break;
+  case 8:	/* presumeably double, but doesn't seem to happen */
+    error ("I don't know how to return a double.");
+    break;
+  }
+}
+
+/* Function: get_saved_register
+   Just call the generic_get_saved_register function.  */
+
+void
+get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval)
+     char *raw_buffer;
+     int *optimized;
+     CORE_ADDR *addrp;
+     struct frame_info *frame;
+     int regnum;
+     enum lval_type *lval;
+{
+  generic_get_saved_register (raw_buffer, optimized, addrp, 
+			      frame, regnum, lval);
+}
+
+struct cmd_list_element *setmemorylist;
+
+static void
+set_register_names ()
+{
+  if (h8300hmode != 0)
+    h8300_register_names = h8300h_register_names;
+  else
+    h8300_register_names = original_register_names;
+}
+
+static void
+h8300_command(args, from_tty)
+{
+  extern int h8300hmode;
+  h8300hmode = 0;
+  h8300smode = 0;
+  set_register_names ();
+}
+
+static void
+h8300h_command(args, from_tty)
+{
+  extern int h8300hmode;
+  h8300hmode = 1;
+  h8300smode = 0;
+  set_register_names ();
+}
+
+static void
+h8300s_command(args, from_tty)
+{
+  extern int h8300smode;
+  extern int h8300hmode;
+  h8300smode = 1;
+  h8300hmode = 1;
+  set_register_names ();
+}
+
+
+static void 
+set_machine (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  printf_unfiltered ("\"set machine\" must be followed by h8300, h8300h");
+  printf_unfiltered ("or h8300s");
+  help_list (setmemorylist, "set memory ", -1, gdb_stdout);
+}
+
+/* set_machine_hook is called as the exec file is being opened, but
+   before the symbol file is opened.  This allows us to set the
+   h8300hmode flag based on the machine type specified in the exec
+   file.  This in turn will cause subsequently defined pointer types
+   to be 16 or 32 bits as appropriate for the machine.  */
+
+static void
+set_machine_hook (filename)
+     char *filename;
+{
+  if (bfd_get_mach (exec_bfd) == bfd_mach_h8300s)
+    {
+      h8300smode = 1;
+      h8300hmode = 1;
+    }
+  else 
+    if (bfd_get_mach (exec_bfd) == bfd_mach_h8300h)
+    {
+      h8300smode = 0;
+      h8300hmode = 1;
+    }
+  else
+    {
+      h8300smode = 0;
+      h8300hmode = 0;
+    }
+  set_register_names ();
+}
+
+void
+_initialize_h8300m ()
+{
+  add_prefix_cmd ("machine", no_class, set_machine,
+		  "set the machine type", 
+		  &setmemorylist, "set machine ", 0,
+		  &setlist);
+
+  add_cmd ("h8300", class_support, h8300_command,
+	   "Set machine to be H8/300.", &setmemorylist);
+
+  add_cmd ("h8300h", class_support, h8300h_command,
+	   "Set machine to be H8/300H.", &setmemorylist);
+
+  add_cmd ("h8300s", class_support, h8300s_command,
+	   "Set machine to be H8/300S.", &setmemorylist);
+
+  /* Add a hook to set the machine type when we're loading a file. */
+
+  specify_exec_file_hook(set_machine_hook);
+}
+
+
+
+void
+print_register_hook (regno)
+{
+  if (regno == 8)
+    {
+      /* CCR register */
+      int C, Z, N, V;
+      unsigned char b[4];
+      unsigned char l;
+      read_relative_register_raw_bytes (regno, b);
+      l = b[REGISTER_VIRTUAL_SIZE(8) -1];
+      printf_unfiltered ("\t");
+      printf_unfiltered ("I-%d - ", (l & 0x80) != 0);
+      printf_unfiltered ("H-%d - ", (l & 0x20) != 0);
+      N = (l & 0x8) != 0;
+      Z = (l & 0x4) != 0;
+      V = (l & 0x2) != 0;
+      C = (l & 0x1) != 0;
+      printf_unfiltered ("N-%d ", N);
+      printf_unfiltered ("Z-%d ", Z);
+      printf_unfiltered ("V-%d ", V);
+      printf_unfiltered ("C-%d ", C);
+      if ((C | Z) == 0)
+	printf_unfiltered ("u> ");
+      if ((C | Z) == 1)
+	printf_unfiltered ("u<= ");
+      if ((C == 0))
+	printf_unfiltered ("u>= ");
+      if (C == 1)
+	printf_unfiltered ("u< ");
+      if (Z == 0)
+	printf_unfiltered ("!= ");
+      if (Z == 1)
+	printf_unfiltered ("== ");
+      if ((N ^ V) == 0)
+	printf_unfiltered (">= ");
+      if ((N ^ V) == 1)
+	printf_unfiltered ("< ");
+      if ((Z | (N ^ V)) == 0)
+	printf_unfiltered ("> ");
+      if ((Z | (N ^ V)) == 1)
+	printf_unfiltered ("<= ");
+    }
+}
+
+void
+_initialize_h8300_tdep ()
+{
+  tm_print_insn = gdb_print_insn_h8300;
+}