Initial revision

1 files changed, 234 insertions, 0 deletions

diff --git a/gdb/tahoe-tdep.c b/gdb/tahoe-tdep.c
new file mode 100644
index 00000000000..ea8a752af6d
--- /dev/null
+++ b/gdb/tahoe-tdep.c
@@ -0,0 +1,234 @@
+/* Print instructions for Tahoe target machines, for GDB.
+   Copyright 1986, 1989, 1991, 1992 Free Software Foundation, Inc.
+   Contributed by the State University of New York at Buffalo, by the
+   Distributed Computer Systems Lab, Department of Computer Science, 1991.
+
+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.  */
+
+#include "defs.h"
+#include "symtab.h"
+#include "opcode/tahoe.h"
+
+/* Tahoe instructions are never longer than this.  */
+#define MAXLEN 62
+
+/* Number of elements in the opcode table.  */
+#define NOPCODES (sizeof votstrs / sizeof votstrs[0])
+
+static unsigned char *print_insn_arg ();
+
+/* Print the Tahoe instruction at address MEMADDR in debugged memory,
+   on STREAM.  Returns length of the instruction, in bytes.  */
+
+int
+tahoe_print_insn (memaddr, stream)
+     CORE_ADDR memaddr;
+     GDB_FILE *stream;
+{
+  unsigned char buffer[MAXLEN];
+  register int i;
+  register unsigned char *p;
+  register char *d;
+
+  read_memory (memaddr, buffer, MAXLEN);
+
+  for (i = 0; i < NOPCODES; i++)
+    if (votstrs[i].detail.code == buffer[0]
+	|| votstrs[i].detail.code == *(unsigned short *)buffer)
+      break;
+
+  /* Handle undefined instructions.  */
+  if (i == NOPCODES)
+    {
+      fprintf_unfiltered (stream, "0%o", buffer[0]);
+      return 1;
+    }
+
+  fprintf_unfiltered (stream, "%s", votstrs[i].name);
+
+  /* Point at first byte of argument data,
+     and at descriptor for first argument.  */
+  p = buffer + 1 + (votstrs[i].detail.code >= 0x100);
+  d = votstrs[i].detail.args;
+
+  if (*d)
+    fputc_unfiltered ('\t', stream);
+
+  while (*d)
+    {
+      p = print_insn_arg (d, p, memaddr + (p - buffer), stream);
+      d += 2;
+      if (*d)
+	fprintf_unfiltered (stream, ",");
+    }
+  return p - buffer;
+}
+/*******************************************************************/
+static unsigned char *
+print_insn_arg (d, p, addr, stream)
+     char *d;
+     register char *p;
+     CORE_ADDR addr;
+     GDB_FILE *stream;
+{
+  int temp1 = 0;
+  register int regnum = *p & 0xf;
+  float floatlitbuf;
+
+  if (*d == 'b')
+    {
+      if (d[1] == 'b')
+	fprintf_unfiltered (stream, "0x%x", addr + *p++ + 1);
+      else
+	{
+
+	  temp1 = *p;
+	  temp1 <<= 8;
+	  temp1 |= *(p + 1);
+	  fprintf_unfiltered (stream, "0x%x", addr + temp1 + 2);
+	  p += 2;
+	}
+    }
+  else
+    switch ((*p++ >> 4) & 0xf)
+      {
+      case 0:
+      case 1:
+      case 2:
+      case 3:			/* Literal (short immediate byte) mode */
+	if (d[1] == 'd' || d[1] == 'f' || d[1] == 'g' || d[1] == 'h')
+	  {
+	    *(int *)&floatlitbuf = 0x4000 + ((p[-1] & 0x3f) << 4);
+	    fprintf_unfiltered (stream, "$%f", floatlitbuf);
+	  }
+	else
+	  fprintf_unfiltered (stream, "$%d", p[-1] & 0x3f);
+	break;
+
+      case 4:			/* Indexed */
+	p = (char *) print_insn_arg (d, p, addr + 1, stream);
+	fprintf_unfiltered (stream, "[%s]", REGISTER_NAME (regnum));
+	break;
+
+      case 5:			/* Register */
+	fprintf_unfiltered (stream, REGISTER_NAME (regnum));
+	break;
+
+      case 7:			/* Autodecrement */
+	fputc_unfiltered ('-', stream);
+      case 6:			/* Register deferred */
+	fprintf_unfiltered (stream, "(%s)", REGISTER_NAME (regnum));
+	break;
+
+      case 9:	                /* Absolute Address & Autoincrement deferred */
+	fputc_unfiltered ('*', stream);
+	if (regnum == PC_REGNUM)
+	  {
+	    temp1 = *p;
+	    temp1 <<= 8;
+	    temp1 |= *(p +1);
+
+	    fputc_unfiltered ('$', stream);
+	    print_address (temp1, stream);
+	    p += 4;
+	    break;
+	  }
+      case 8:			/*Immediate & Autoincrement SP */
+        if (regnum == 8)         /*88 is Immediate Byte Mode*/
+	  fprintf_unfiltered (stream, "$%d", *p++);
+
+	else if (regnum == 9)        /*89 is Immediate Word Mode*/
+	  {
+	    temp1 = *p;
+	    temp1 <<= 8; 
+	    temp1 |= *(p +1);
+	    fprintf_unfiltered (stream, "$%d", temp1);
+	    p += 2;
+	  }  
+
+	else if (regnum == PC_REGNUM)    /*8F is Immediate Long Mode*/
+	  {
+	    temp1 = *p;
+	    temp1 <<=8;
+	    temp1 |= *(p +1);
+	    temp1 <<=8;
+	    temp1 |= *(p +2);
+	    temp1 <<= 8;
+	    temp1 |= *(p +3);
+	    fprintf_unfiltered (stream, "$%d", temp1);
+	    p += 4;
+	  }
+
+	else                            /*8E is Autoincrement SP Mode*/
+	      fprintf_unfiltered (stream, "(%s)+", REGISTER_NAME (regnum));
+	break;
+
+      case 11:			/* Register + Byte Displacement Deferred Mode*/
+	fputc_unfiltered ('*', stream);
+      case 10:			/* Register + Byte Displacement Mode*/
+	if (regnum == PC_REGNUM)
+	  print_address (addr + *p + 2, stream);
+	else
+	  fprintf_unfiltered (stream, "%d(%s)", *p, REGISTER_NAME (regnum));
+	p += 1;
+	break;
+
+      case 13:			/* Register + Word Displacement Deferred Mode*/
+	fputc_unfiltered ('*', stream);
+      case 12:			/* Register + Word Displacement Mode*/
+	temp1 = *p;
+	temp1 <<= 8;
+	temp1 |= *(p +1);
+	if (regnum == PC_REGNUM)
+	  print_address (addr + temp1 + 3, stream);
+	else
+	  fprintf_unfiltered (stream, "%d(%s)", temp1, REGISTER_NAME (regnum));
+	p += 2;
+	break;
+
+      case 15:			/* Register + Long Displacement Deferred Mode*/
+	fputc_unfiltered ('*', stream);
+      case 14:			/* Register + Long Displacement Mode*/
+	temp1 = *p;
+	temp1 <<= 8;
+	temp1 |= *(p +1);
+	temp1 <<= 8;
+	temp1 |= *(p +2);
+	temp1 <<= 8;
+	temp1 |= *(p +3);
+	if (regnum == PC_REGNUM)
+	  print_address (addr + temp1 + 5, stream);
+	else
+	  fprintf_unfiltered (stream, "%d(%s)", temp1, REGISTER_NAME (regnum));
+	p += 4;
+      }
+
+  return (unsigned char *) p;
+}
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