Checkpoint for Stu

1 files changed, 802 insertions, 0 deletions

diff --git a/gdb/h8500-tdep.c b/gdb/h8500-tdep.c
new file mode 100644
index 0000000..31ad3f5
--- /dev/null
+++ b/gdb/h8500-tdep.c
@@ -0,0 +1,802 @@
+/* Target-machine dependent code for Hitachi H8/500, for GDB.
+   Copyright (C) 1993 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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+/*
+ Contributed by Steve Chamberlain
+                sac@cygnus.com
+ */
+
+#include "defs.h"
+#include "frame.h"
+#include "obstack.h"
+#include "symtab.h"
+#include "gdbtypes.h"
+#include "gdbcmd.h"
+#include "dis-asm.h"
+#include "../opcodes/h8500-opc.h"
+;
+#undef NUM_REGS
+#define NUM_REGS 11
+
+#define UNSIGNED_SHORT(X) ((X) & 0xffff)
+
+
+/* Shape of an H8/500 frame : 
+
+
+   arg-n
+   ..
+   arg-2
+   arg-1
+   return address <2 or 4 bytes>
+   old fp	  <2 bytes>
+   auto-n
+   ..
+   auto-1
+   saved registers
+
+*/
+
+
+/* an easy to debug H8 stack frame looks like:
+0x6df6		push	r6
+0x0d76  	mov.w   r7,r6
+0x6dfn          push    reg
+0x7905 nnnn  	mov.w  #n,r5    or   0x1b87  subs #2,sp
+0x1957       	sub.w  r5,sp
+
+ */
+
+#define IS_PUSH(x) ((x & 0xff00)==0x6d00)
+#define IS_LINK_8(x) ((x) == 0x17)
+#define IS_LINK_16(x) ((x) == 0x1f)
+#define IS_MOVE_FP(x) (x == 0x0d76)
+#define IS_MOV_SP_FP(x) (x == 0x0d76)
+#define IS_SUB2_SP(x) (x==0x1b87)
+#define IS_MOVK_R5(x) (x==0x7905)
+#define IS_SUB_R5SP(x) (x==0x1957)
+
+#define LINK_8 0x17
+#define LINK_16 0x1f
+
+int minimum_mode = 1;
+CORE_ADDR examine_prologue ();
+
+void frame_find_saved_regs ();
+CORE_ADDR
+h8500_skip_prologue (start_pc)
+     CORE_ADDR start_pc;
+
+{
+  short int w;
+
+  
+  w = read_memory_integer (start_pc, 1);
+  if (w == LINK_8)
+    {
+      start_pc ++;
+      w = read_memory_integer (start_pc,1);
+    }
+
+  if (w == LINK_16)
+    {
+      start_pc +=2;
+      w = read_memory_integer (start_pc,2);
+    }
+
+  /* Skip past a move to FP */
+  if (IS_MOVE_FP (w))
+    {
+      start_pc += 2;
+      w = read_memory_short (start_pc);
+    }
+
+  /* Skip the stack adjust */
+
+  if (IS_MOVK_R5 (w))
+    {
+      start_pc += 2;
+      w = read_memory_short (start_pc);
+    }
+  if (IS_SUB_R5SP (w))
+    {
+      start_pc += 2;
+      w = read_memory_short (start_pc);
+    }
+  while (IS_SUB2_SP (w))
+    {
+      start_pc += 2;
+      w = read_memory_short (start_pc);
+    }
+
+  return start_pc;
+
+}
+
+int
+print_insn (memaddr, stream)
+     CORE_ADDR memaddr;
+     FILE *stream;
+{
+  /* Nothing is bigger than 8 bytes */
+  char data[8];
+  disassemble_info info;
+  read_memory (memaddr, data, sizeof (data));
+  GDB_INIT_DISASSEMBLE_INFO(info, stream);
+  return print_insn_h8500 (memaddr, data, &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.  */
+
+FRAME_ADDR
+FRAME_CHAIN (thisframe)
+     FRAME thisframe;
+{
+  static int loopcount;
+  static int prevr;
+  if (!inside_entry_file ((thisframe)->pc))
+    {
+      int v =  read_memory_integer ((thisframe)->frame, PTR_SIZE) ;
+
+      /* Detect loops in the stack */
+      if (v == prevr) loopcount++;
+      else loopcount = 0;
+      v = prevr;
+      if (loopcount > 5) return 0;
+    }
+  return 0;
+}
+
+/* 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_cache_obstack, since
+   it is fairly expensive.  */
+#if 0
+
+void
+frame_find_saved_regs (fi, fsr)
+     struct frame_info *fi;
+     struct frame_saved_regs *fsr;
+{
+  register CORE_ADDR next_addr;
+  register CORE_ADDR *saved_regs;
+  register int regnum;
+  register struct frame_saved_regs *cache_fsr;
+  extern struct obstack frame_cache_obstack;
+  CORE_ADDR ip;
+  struct symtab_and_line sal;
+  CORE_ADDR limit;
+
+  if (!fi->fsr)
+    {
+      cache_fsr = (struct frame_saved_regs *)
+	obstack_alloc (&frame_cache_obstack,
+		       sizeof (struct frame_saved_regs));
+      bzero (cache_fsr, sizeof (struct frame_saved_regs));
+
+      fi->fsr = cache_fsr;
+
+      /* 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;
+}
+
+#endif
+
+/* 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;
+     char *pword1;
+{
+  if (addr < lim + 8)
+    {
+      read_memory (addr, pword1, 1);
+      read_memory (addr, pword1 + 1, 1);
+      return 1;
+    }
+  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.  */
+#if 0
+static CORE_ADDR
+examine_prologue (ip, limit, after_prolog_fp, fsr, fi)
+     register CORE_ADDR ip;
+     register CORE_ADDR limit;
+     FRAME_ADDR after_prolog_fp;
+     struct frame_saved_regs *fsr;
+     struct frame_info *fi;
+{
+  register CORE_ADDR next_ip;
+  int r;
+  int i;
+  int have_fp = 0;
+
+  register int src;
+  register struct pic_prologue_code *pcode;
+  char insn[2];
+  int size, offset;
+  unsigned int reg_save_depth = 2;	/* Number of things pushed onto
+				      stack, starts at 2, 'cause the
+				      PC is already there */
+
+  unsigned int auto_depth = 0;	/* Number of bytes of autos */
+
+  char in_frame[8];		/* One for each reg */
+
+  memset (in_frame, 1, 8);
+  for (r = 0; r < 8; r++)
+    {
+      fsr->regs[r] = 0;
+    }
+  if (after_prolog_fp == 0)
+    {
+      after_prolog_fp = read_register (SP_REGNUM);
+    }
+  if (ip == 0 || ip & ~0xffffff)
+    return 0;
+
+  ok = NEXT_PROLOGUE_INSN (ip, limit, &insn[0]);
+
+  /* Skip over any fp push instructions */
+  fsr->regs[6] = after_prolog_fp;
+
+  if (ok && IS_LINK_8 (insn[0]))
+    {
+      ip++;
+
+      in_frame[6] = reg_save_depth;
+      reg_save_depth += 2;
+    }
+
+  next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
+
+  /* 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))
+    {
+      while (next_ip && IS_SUB2_SP (insn_word))
+	{
+	  auto_depth += 2;
+	  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;
+
+	}
+    }
+  /* Work out which regs are stored where */
+  while (next_ip && 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;
+    }
+
+  /* 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_short (after_prolog_fp + 2);
+
+  /* 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_short (fsr->regs[6]));
+  else
+    fsr->regs[SP_REGNUM] = after_prolog_fp + auto_depth;
+
+  return (ip);
+}
+#endif
+#if 0
+void
+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;
+
+}
+#endif
+
+/* Return the saved PC from this frame. */
+
+CORE_ADDR
+frame_saved_pc (frame)
+     FRAME frame;
+{
+	return read_memory_integer ((frame)->frame + 2, PTR_SIZE);
+}
+
+CORE_ADDR
+frame_locals_address (fi)
+     struct frame_info *fi;
+{
+  return fi->frame;
+}
+
+/* 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;
+{
+  return fi->frame + PTR_SIZE;	/* Skip the PC */
+}
+
+void
+h8300_pop_frame ()
+{
+  unsigned regnum;
+  struct frame_saved_regs fsr;
+  struct frame_info *fi;
+
+  FRAME frame = get_current_frame ();
+
+  fi = get_frame_info (frame);
+  get_frame_saved_regs (fi, &fsr);
+
+  for (regnum = 0; regnum < 8; regnum++)
+    {
+      if (fsr.regs[regnum])
+	{
+	  write_register (regnum, read_memory_short (fsr.regs[regnum]));
+	}
+
+      flush_cached_frames ();
+      set_current_frame (create_new_frame (read_register (FP_REGNUM),
+					   read_pc ()));
+
+    }
+
+}
+
+void
+print_register_hook (regno)
+{
+  if (regno == CCR_REGNUM)
+    {
+      /* CCR register */
+
+      int C, Z, N, V;
+      unsigned char b[2];
+      unsigned char l;
+
+      read_relative_register_raw_bytes (regno, b);
+      l = b[1];
+      printf ("\t");
+      printf ("I-%d - ", (l & 0x80) != 0);
+      N = (l & 0x8) != 0;
+      Z = (l & 0x4) != 0;
+      V = (l & 0x2) != 0;
+      C = (l & 0x1) != 0;
+      printf ("N-%d ", N);
+      printf ("Z-%d ", Z);
+      printf ("V-%d ", V);
+      printf ("C-%d ", C);
+      if ((C | Z) == 0)
+	printf ("u> ");
+      if ((C | Z) == 1)
+	printf ("u<= ");
+      if ((C == 0))
+	printf ("u>= ");
+      if (C == 1)
+	printf ("u< ");
+      if (Z == 0)
+	printf ("!= ");
+      if (Z == 1)
+	printf ("== ");
+      if ((N ^ V) == 0)
+	printf (">= ");
+      if ((N ^ V) == 1)
+	printf ("< ");
+      if ((Z | (N ^ V)) == 0)
+	printf ("> ");
+      if ((Z | (N ^ V)) == 1)
+	printf ("<= ");
+    }
+}
+
+
+
+#if 0
+register_byte (N)
+{
+  return reginfo[N].offset;
+}
+#endif
+register_raw_size (N)
+{
+  if (N <= R7) return 2;
+  return 4;
+}
+
+register_virtual_size (N)
+{
+  if (N <= R7) return 2;
+  return 4;
+}
+
+
+
+register_convert_to_raw (regnum, from, to)
+     int regnum;
+     char *from;
+     char *to;
+{
+  switch (regnum)
+    {
+    case PR0:
+    case PR1:
+    case PR2:
+    case PR3:
+    case PR4:
+    case PR5:
+    case PR6:
+    case PR7:
+    case PC_REGNUM:
+      to[0] = 0;
+      to[1] = from[1];
+      to[2] = from[2];
+      to[3] = from[3];
+      break;
+    default:
+      to[0] = from[0];
+      to[1] = from[1];
+      break;
+    }
+}
+
+
+register_convert_to_virtual (regnum, from, to)
+     int regnum;
+     char *from;
+     char *to;
+{
+  switch (regnum)
+    {
+    case PR0:
+    case PR1:
+    case PR2:
+    case PR3:
+    case PR4:
+    case PR5:
+    case PR6:
+    case PR7:
+    case PC_REGNUM:
+      to[0] = 0;
+      to[1] = from[1];
+      to[2] = from[2];
+      to[3] = from[3];
+      break;
+    default:
+      to[0] = from[0];
+      to[1] = from[1];
+      break;
+    }
+}
+
+struct type *
+register_virtual_type (N)
+{
+  switch (N)
+    {
+      /* Although these are actually word size registers, we treat them
+	 like longs so that we can deal with any implicit segmentation */
+    case PR0:
+    case PR1:
+    case PR2:
+    case PR3:
+    case PR4:
+    case PR5:
+    case PR6:
+    case PR7:
+    case PC_REGNUM:
+      return builtin_type_unsigned_long;
+    case SEG_C:
+    case SEG_E:
+    case SEG_D:
+    case SEG_T:
+      return builtin_type_unsigned_char;
+    case R0:
+    case R1:
+    case R2:
+    case R3:
+    case R4:
+    case R5:
+    case R6:
+    case R7:
+    case CCR_REGNUM:
+      return builtin_type_unsigned_short;
+
+
+    default:
+      abort();
+    }
+}
+
+
+
+
+/* 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.  */
+
+void
+frame_find_saved_regs (frame_info, frame_saved_regs)
+     struct frame_info *frame_info;
+     struct frame_saved_regs *frame_saved_regs;
+
+{
+  register int regnum;
+  register int regmask;
+  register CORE_ADDR next_addr;
+  register CORE_ADDR pc;
+  unsigned char thebyte;
+
+  bzero (frame_saved_regs, sizeof *frame_saved_regs);
+
+  if ((frame_info)->pc >= (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 4
+      && (frame_info)->pc <= (frame_info)->frame)
+    {
+      next_addr = (frame_info)->frame;
+      pc = (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 4;
+    }
+  else
+    {
+      pc = get_pc_function_start ((frame_info)->pc);
+      /* Verify we have a link a6 instruction next;
+	 if not we lose.  If we win, find the address above the saved
+	 regs using the amount of storage from the link instruction.
+	 */
+
+      thebyte  = read_memory_integer(pc, 1);
+      if (0x1f == thebyte)
+	next_addr = (frame_info)->frame + read_memory_integer (pc += 1, 2), pc += 2;
+      else if (0x17 == thebyte)
+	next_addr = (frame_info)->frame + read_memory_integer (pc += 1, 1), pc += 1;
+      else
+	goto lose;
+#if 0
+      fixme steve
+	/* If have an add:g.waddal #-n, sp next, adjust next_addr.  */
+	if ((0x0c0177777 & read_memory_integer (pc, 2)) == 0157774)
+	  next_addr += read_memory_integer (pc += 2, 4), pc += 4;
+#endif
+    }
+
+  thebyte = read_memory_integer(pc, 1);
+  if (thebyte == 0x12) {
+    /* Got stm */
+    pc++;
+    regmask = read_memory_integer(pc,1);
+    pc++;
+    for (regnum = 0; regnum < 8; regnum ++, regmask >>=1) 
+      {
+	if (regmask & 1) 
+	  {
+	    (frame_saved_regs)->regs[regnum] = (next_addr += 2) - 2;
+	  }
+      }
+    thebyte = read_memory_integer(pc, 1);
+  }
+  /* Maybe got a load of pushes */
+  while (thebyte == 0xbf) {
+    pc++;
+    regnum = read_memory_integer(pc,1) & 0x7;
+    pc++;
+    (frame_saved_regs)->regs[regnum] = (next_addr += 2) - 2;    
+    thebyte = read_memory_integer(pc, 1);
+  }
+
+ lose:;
+  
+  /* Remember the address of the frame pointer */
+  (frame_saved_regs)->regs[FP_REGNUM] = (frame_info)->frame;
+
+  /* This is where the old sp is hidden */
+  (frame_saved_regs)->regs[SP_REGNUM] = (frame_info)->frame;
+
+  /* And the PC - remember the pushed FP is always two bytes long */
+  (frame_saved_regs)->regs[PC_REGNUM] = (frame_info)->frame + 2;
+}
+
+saved_pc_after_call(frame)
+{
+  int x;
+  int a = read_register(SP_REGNUM);
+  x = read_memory_integer (a, PTR_SIZE);
+  return x;
+}
+
+
+/* Nonzero if instruction at PC is a return instruction.  */
+
+about_to_return(pc)
+{
+  int b1 = read_memory_integer(pc,1);
+
+  switch (b1) 
+    {
+    case 0x14:			/* rtd #8 */
+    case 0x1c:			/* rtd #16 */
+    case 0x19:			/* rts */
+    case 0x1a:			/* rte */
+      return 1;
+    case 0x11:
+      {
+	int b2 = read_memory_integer(pc+1,1);
+	switch (b2) 
+	  {
+	  case 0x18:		/* prts */
+	  case 0x14:		/* prtd #8 */
+	  case 0x16:		/* prtd #16 */
+	    return 1;
+	  }
+      }
+    }
+  return 0;
+}
+
+
+void
+h8500_set_pointer_size (newsize)
+     int newsize;
+{
+  static int oldsize = 0;
+
+  if (oldsize != newsize)
+    {
+      printf ("pointer size set to %d bits\n", newsize);
+      oldsize = newsize;
+      if (newsize == 32)
+	{
+	  minimum_mode = 0;
+	}
+      else
+	{
+	  minimum_mode = 1;
+	}
+      _initialize_gdbtypes ();
+    }
+}
+
+
+struct cmd_list_element *setmemorylist;
+
+
+static void
+segmented_command (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  h8500_set_pointer_size (32);
+}
+
+static void
+unsegmented_command (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  h8500_set_pointer_size (16);
+}
+
+static void
+set_memory (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  printf ("\"set memory\" must be followed by the name of a memory subcommand.\n");
+  help_list (setmemorylist, "set memory ", -1, stdout);
+}
+
+
+_initialize_h8500_tdep ()
+{
+  /* Sanitity check a few things */
+  if (FP_REGNUM != GPR6
+      || SP_REGNUM != GPR7
+      || CCR_REGNUM != GCCR
+      || PC_REGNUM != GPC
+      || SEG_C != GSEGC
+      || SEG_D != GSEGD
+      || SEG_E != GSEGE
+      || SEG_T != GSEGT
+      || PR0 != GPR0
+      || PR1 != GPR1
+      || PR2 != GPR2
+      || PR3 != GPR3
+      || PR4 != GPR4
+      || PR5 != GPR5
+      || PR6 != GPR6
+      || PR7 != GPR7)
+    abort ();
+
+  add_prefix_cmd ("memory", no_class, set_memory,
+		  "set the memory model", &setmemorylist, "set memory ", 0,
+		  &setlist);
+  add_cmd ("segmented", class_support, segmented_command,
+	   "Set segmented memory model.", &setmemorylist);
+  add_cmd ("unsegmented", class_support, unsegmented_command,
+	   "Set unsegmented memory model.", &setmemorylist);
+
+}