Initial revision

4 files changed, 917 insertions, 0 deletions

diff --git a/gdb/tahoe-opcode.h b/gdb/tahoe-opcode.h
new file mode 100755
index 0000000..b5cee24
--- /dev/null
+++ b/gdb/tahoe-opcode.h
@@ -0,0 +1,213 @@
+/*
+ * Ported by the State University of New York at Buffalo by the Distributed
+ * Computer Systems Lab, Department of Computer Science, 1991.
+ */
+
+#ifndef tahoe_opcodeT
+#define tahoe_opcodeT int
+#endif /* no tahoe_opcodeT */
+
+struct vot_wot                  /* tahoe opcode table: wot to do with this */
+                                /* particular opcode */
+{
+  char *            args;       /* how to compile said opcode */
+  tahoe_opcodeT       code;     /* op-code (may be > 8 bits!) */
+};
+
+struct vot                      /* tahoe opcode text */
+{
+  char *            name;       /* opcode name: lowercase string  [key]  */
+  struct vot_wot    detail;     /* rest of opcode table          [datum] */
+};
+
+#define vot_how args
+#define vot_code code
+#define vot_detail detail
+#define vot_name name
+
+static struct vot
+votstrs[] =
+{
+{    "halt",	{"",			0x00	} },
+{    "sinf",    {"",                    0x05    } },
+{    "ldf",     {"rl",                  0x06    } },
+{    "ldd",     {"rq",                  0x07    } },
+{    "addb2",	{"rbmb",		0x08	} },
+{    "movb",	{"rbwb",		0x09	} },
+{    "addw2",	{"rwmw",		0x0a	} },
+{    "movw",	{"rwww",		0x0b	} },
+{    "addl2",	{"rlml",		0x0c	} },
+{    "movl",	{"rlwl",		0x0d	} },
+{    "bbs",	{"rlvlbw",		0x0e	} },
+{    "nop",     {"",                    0x10    } },
+{    "brb",	{"bb",			0x11	} },
+{    "brw",	{"bw",			0x13	} },
+{    "cosf",    {"",                    0x15    } },
+{    "lnf",     {"rl",                  0x16    } },
+{    "lnd",     {"rq",                  0x17    } },
+{    "addb3",	{"rbrbwb",		0x18	} },
+{    "cmpb",	{"rbwb",		0x19	} }, 
+{    "addw3",	{"rwrwww",		0x1a	} },
+{    "cmpw",	{"rwww",		0x1b	} },
+{    "addl3",	{"rlrlwl",		0x1c	} },
+{    "cmpl",	{"rlwl",		0x1d	} },
+{    "bbc",	{"rlvlbw",		0x1e	} },
+{    "rei",	{"",			0x20	} },
+{    "bneq",	{"bb",			0x21	} },
+{    "bnequ",	{"bb",			0x21	} },
+{    "cvtwl",	{"rwwl",		0x23	} },
+{    "stf",     {"wl",                  0x26    } },
+{    "std",     {"wq",                  0x27    } },
+{    "subb2",	{"rbmb",		0x28	} },
+{    "mcomb",	{"rbwb",		0x29	} },
+{    "subw2",	{"rwmw",		0x2a	} },
+{    "mcomw",	{"rwww",		0x2b	} },
+{    "subl2",   {"rlml",                0x2c    } },
+{    "mcoml",   {"rlwl",                0x2d    } },
+{    "emul",	{"rlrlrlwq",		0x2e	} },
+{    "aoblss",	{"rlmlbw",		0x2f	} },
+{    "bpt",	{"",			0x30	} },
+{    "beql",	{"bb",			0x31	} },
+{    "beqlu",	{"bb",			0x31	} },
+{    "cvtwb",	{"rwwb",		0x33	} },
+{    "logf",    {"",                    0x35    } },
+{    "cmpf",    {"rl",                  0x36    } },
+{    "cmpd",    {"rq",                  0x37    } },
+{    "subb3",	{"rbrbwb",		0x38	} },
+{    "bitb",	{"rbrb",		0x39	} },
+{    "subw3",	{"rwrwww",		0x3a	} },
+{    "bitw",	{"rwrw",		0x3b	} },
+{    "subl3",	{"rlrlwl",		0x3c	} },
+{    "bitl",	{"rlrl",		0x3d	} },
+{    "ediv",	{"rlrqwlwl",		0x3e	} },
+{    "aobleq",	{"rlmlbw",		0x3f	} },
+{    "ret",	{"",			0x40	} },
+{    "bgtr",	{"bb",			0x41	} },
+{    "sqrtf",   {"",                    0x45    } },
+{    "cmpf2",   {"rl",                  0x46    } },
+{    "cmpd2",   {"rqrq",                0x47    } },
+{    "shll",    {"rbrlwl",              0x48    } },
+{    "clrb",	{"wb",			0x49	} },
+{    "shlq",	{"rbrqwq",		0x4a	} },
+{    "clrw",	{"ww",			0x4b	} },
+{    "mull2",	{"rlml",		0x4c	} },
+{    "clrl",	{"wl",			0x4d	} },
+{    "shal",    {"rbrlwl",		0x4e	} },
+{    "bleq",	{"bb",			0x51	} },
+{    "expf",    {"",                    0x55    } },
+{    "tstf",    {"",                    0x56    } },
+{    "tstd",    {"",                    0x57    } },
+{    "shrl",    {"rbrlwl",		0x58	} },
+{    "tstb",	{"rb",			0x59	} },
+{    "shrq",    {"rbrqwq",		0x5a	} },
+{    "tstw",	{"rw",			0x5b	} },
+{    "mull3",	{"rlrlwl",		0x5c	} },
+{    "tstl",	{"rl",			0x5d	} },
+{    "shar",	{"rbrlwl",		0x5e	} },
+{    "bbssi",	{"rlmlbw",		0x5f	} },
+{    "ldpctx",	{"",			0x60	} },
+{    "pushd",   {"",                    0x67    } },
+{    "incb",	{"mb",			0x69	} },
+{    "incw",	{"mw",			0x6b	} },
+{    "divl2",	{"rlml",		0x6c	} },
+{    "incl",	{"ml",			0x6d	} },
+{    "cvtlb",	{"rlwb",		0x6f	} },
+{    "svpctx",	{"",			0x70	} },
+{    "jmp",	{"ab",			0x71	} },
+{    "cvlf",    {"rl",                  0x76    } },
+{    "cvld",    {"rl",                  0x77    } },
+{    "decb",	{"mb",			0x79	} },
+{    "decw",	{"mw",			0x7b	} },
+{    "divl3",	{"rlrlwl",		0x7c	} },
+{    "decl",	{"ml",			0x7d	} },
+{    "cvtlw",	{"rlww",		0x7f	} },
+{    "bgeq",	{"bb",			0x81	} },
+{    "movs2",	{"abab",		0x82	} },
+{    "cvfl",    {"wl",                  0x86    } },
+{    "cvdl",    {"wl",                  0x87    } },
+{    "orb2",	{"rbmb",		0x88	} },
+{    "cvtbl",	{"rbwl",		0x89	} },
+{    "orw2",	{"rwmw",		0x8a	} },
+{    "bispsw",	{"rw",			0x8b	} },
+{    "orl2",    {"rlml",                0x8c    } },
+{    "adwc",	{"rlml",		0x8d	} },
+{    "adda", 	{"rlml",		0x8e	} },
+{    "blss",	{"bb",			0x91	} },
+{    "cmps2",   {"abab",		0x92	} },
+{    "ldfd",    {"rl",                  0x97    } },
+{    "orb3",	{"rbrbwb",		0x98	} },
+{    "cvtbw",	{"rbww",		0x99	} },
+{    "orw3",   	{"rwrwww",		0x9a	} },
+{    "bicpsw",	{"rw",			0x9b	} },
+{    "orl3",    {"rlrlwl",              0x9c    } },
+{    "sbwc",	{"rlml",		0x9d	} },
+{    "suba",    {"rlml",                0x9e    } },
+{    "bgtru",	{"bb",			0xa1	} },
+{    "cvdf",    {"",                    0xa6    } },
+{    "andb2",   {"rbmb",		0xa8    } },
+{    "movzbl",	{"rbwl",		0xa9	} },
+{    "andw2",   {"rwmw",		0xaa    } },
+{    "loadr",   {"rwal",		0xab	} },
+{    "andl2",   {"rlml",		0xac    } },
+{    "mtpr",	{"rlrl",		0xad	} },
+{    "ffs",	{"rlwl",		0xae	} },
+{    "blequ",	{"bb",			0xb1	} },
+{    "negf",    {"",                    0xb6    } },
+{    "negd",    {"",                    0xb7    } },
+{    "andb3",   {"rbrbwb",              0xb8    } },
+{    "movzbw",	{"rbww",		0xb9	} },
+{    "andw3",   {"rwrwww",		0xba    } },
+{    "storer",  {"rwal",                0xbb    } },
+{    "andl3",   {"rlrlwl",		0xbc    } },
+{    "mfpr",	{"rlwl",		0xbd	} },
+{    "ffc",	{"rlwl",		0xbe	} },
+{    "calls",	{"rbab",		0xbf	} },
+{    "prober",	{"rbabrl",		0xc0	} },
+{    "bvc",	{"bb",			0xc1	} },
+{    "movs3",	{"ababrw",		0xc2	} },
+{    "movzwl",	{"rwwl",		0xc3	} },
+{    "addf",    {"rl",                  0xc6    } },
+{    "addd",    {"rq",                  0xc7    } },
+{    "xorb2",   {"rbmb",                0xc8    } },
+{    "movob",   {"rbwb",                0xc9    } },
+{    "xorw2",   {"rwmw",                0xca    } },
+{    "movow",   {"rwww",                0xcb	} },
+{    "xorl2",	{"rlml",                0xcc    } },
+{    "movpsl",  {"wl",                  0xcd    } },
+{    "kcall",   {"rw",			0xcf	} },
+{    "probew",  {"rbabrl",		0xd0	} },
+{    "bvs",     {"bb",			0xd1	} },
+{    "cmps3",   {"ababrw",		0xd2	} },
+{    "subf",    {"rq",                  0xd6    } },
+{    "subd",    {"rq",                  0xd7    } },
+{    "xorb3",	{"rbrbwb",		0xd8	} },
+{    "pushb",   {"rb",			0xd9	} },
+{    "xorw3",	{"rwrwww",		0xda	} },
+{    "pushw",   {"rw", 			0xdb	} },
+{    "xorl3",	{"rlrlwl",		0xdc	} },
+{    "pushl",	{"rl",			0xdd	} },
+{    "insque",	{"abab",		0xe0	} },
+{    "bcs",	{"bb",			0xe1	} },
+{    "bgequ",	{"bb",			0xe1	} },
+{    "mulf",    {"rq",                  0xe6    } },
+{    "muld",    {"rq",                  0xe7    } },
+{    "mnegb",	{"rbwb",		0xe8	} },
+{    "movab",	{"abwl",		0xe9	} },
+{    "mnegw",	{"rwww",		0xea	} },
+{    "movaw",	{"awwl",		0xeb	} },
+{    "mnegl",	{"rlwl",		0xec	} },
+{    "moval",	{"alwl",		0xed	} },
+{    "remque",	{"ab",  		0xf0	} },
+{    "bcc",	{"bb",			0xf1	} },
+{    "blssu",	{"bb",			0xf1	} },
+{    "divf",    {"rq",                  0xf6    } },
+{    "divd",    {"rq",                  0xf7    } },
+{    "movblk",  {"alalrw",              0xf8	} },
+{    "pushab",	{"ab",			0xf9	} },
+{    "pushaw",	{"aw",			0xfb	} },
+{    "casel",	{"rlrlrl",		0xfc	} },
+{    "pushal",	{"al",			0xfd	} },
+{    "callf",	{"rbab",		0xfe	} },
+{      ""       ,   ""          } /* empty is end sentinel */
+
+};
diff --git a/gdb/tahoe-pinsn.c b/gdb/tahoe-pinsn.c
new file mode 100644
index 0000000..32796da
--- /dev/null
+++ b/gdb/tahoe-pinsn.c
@@ -0,0 +1,223 @@
+/*
+ * Ported by the State University of New York at Buffalo by the Distributed
+ * Computer Systems Lab, Department of Computer Science, 1991.
+ */
+
+#include <stdio.h>
+
+#include "defs.h"
+#include "param.h"
+#include "symtab.h"
+#include "opcode.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])
+
+extern char *reg_names[];
+
+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
+print_insn (memaddr, stream)
+     CORE_ADDR memaddr;
+     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 (stream, "0%o", buffer[0]);
+      return 1;
+    }
+
+  fprintf (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 ('\t', stream);
+
+  while (*d)
+    {
+      p = print_insn_arg (d, p, memaddr + (p - buffer), stream);
+      d += 2;
+      if (*d)
+	fprintf (stream, ",");
+    }
+  return p - buffer;
+}
+/*******************************************************************/
+static unsigned char *
+print_insn_arg (d, p, addr, stream)
+     char *d;
+     register char *p;
+     CORE_ADDR addr;
+     FILE *stream;
+{
+  int temp1 = 0;
+  register int regnum = *p & 0xf;
+  float floatlitbuf;
+
+  if (*d == 'b')
+    {
+      if (d[1] == 'b')
+	fprintf (stream, "0x%x", addr + *p++ + 1);
+      else
+	{
+
+	  temp1 = *p;
+	  temp1 <<= 8;
+	  temp1 |= *(p + 1);
+	  fprintf (stream, "0x%x", addr + temp1 + 2);
+	  p += 2;
+	}
+    }
+  else
+    switch ((*p++ >> 4) & 0xf)
+      {
+      case 0:
+      case 1:
+      case 2:
+      case 3:			/* Liter>al(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 (stream, "$%f", floatlitbuf);
+	  }
+	else
+	  fprintf (stream, "$%d", p[-1] & 0x3f);
+	break;
+
+      case 4:			/* Indexed */
+	p = (char *) print_insn_arg (d, p, addr + 1, stream);
+	fprintf (stream, "[%s]", reg_names[regnum]);
+	break;
+
+      case 5:			/* Register */
+	fprintf (stream, reg_names[regnum]);
+	break;
+
+      case 7:			/* Autodecrement */
+	fputc ('-', stream);
+      case 6:			/* Register deferred */
+	fprintf (stream, "(%s)", reg_names[regnum]);
+	break;
+
+      case 9:	                /* Absolute Address & Autoincrement deferred */
+	fputc ('*', stream);
+	if (regnum == PC_REGNUM)
+	  {
+	    temp1 = *p;
+	    temp1 <<= 8;
+	    temp1 |= *(p +1);
+
+	    fputc ('$', stream);
+	    print_address (temp1, stream);
+	    p += 4;
+	    break;
+	  }
+      case 8:			/*Immediate & Autoincrement SP */
+        if (regnum == 8)         /*88 is Immediate Byte Mode*/
+	  fprintf (stream, "$%d", *p++);
+
+	else if (regnum == 9)        /*89 is Immediate Word Mode*/
+	  {
+	    temp1 = *p;
+	    temp1 <<= 8; 
+	    temp1 |= *(p +1);
+	    fprintf (stream, "$%d", temp1);
+	    p += 2;
+	  }  
+
+	else if (regnum == PC_REGNUM)    /*8F is Immediate Long Mode*/
+	  {
+	    temp1 = *p;
+	    temp1 <<=8;
+	    temp1 |= *(p +1);
+	    temp1 <<=8;
+	    temp1 |= *(p +2);
+	    temp1 <<= 8;
+	    temp1 |= *(p +3);
+	    fprintf (stream, "$%d", temp1);
+	    p += 4;
+	  }
+
+	else                            /*8E is Autoincrement SP Mode*/
+	      fprintf (stream, "(%s)+", reg_names[regnum]);
+	break;
+
+      case 11:			/* Register + Byte Displacement Deferred Mode*/
+	fputc ('*', stream);
+      case 10:			/* Register + Byte Displacement Mode*/
+	if (regnum == PC_REGNUM)
+	  print_address (addr + *p + 2, stream);
+	else
+	  fprintf (stream, "%d(%s)", *p, reg_names[regnum]);
+	p += 1;
+	break;
+
+      case 13:			/* Register + Word Displacement Deferred Mode*/
+	fputc ('*', 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 (stream, "%d(%s)", temp1, reg_names[regnum]);
+	p += 2;
+	break;
+
+      case 15:			/* Register + Long Displacement Deferred Mode*/
+	fputc ('*', 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 (stream, "%d(%s)", temp1, reg_names[regnum]);
+	p += 4;
+      }
+
+  return (unsigned char *) p;
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/gdb/tm-tahoe.h b/gdb/tm-tahoe.h
new file mode 100644
index 0000000..fddfb84
--- /dev/null
+++ b/gdb/tm-tahoe.h
@@ -0,0 +1,334 @@
+/* Definitions to make GDB target for a tahoe running 4.3-Reno.
+   Copyright (C) 1986, 1987, 1989, 1991 Free Software Foundation, Inc.
+
+This file is part of GDB.
+
+GDB 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 1, or (at your option)
+any later version.
+
+GDB 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 GDB; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+/*
+ * Ported by the State University of New York at Buffalo by the Distributed
+ * Computer Systems Lab, Department of Computer Science, 1991.
+ */
+
+#define TARGET_BYTE_ORDER BIG_ENDIAN
+#define BITS_BIG_ENDIAN 0
+
+/* Define this if the C compiler puts an underscore at the front
+   of external names before giving them to the linker.  */
+
+#define NAMES_HAVE_UNDERSCORE
+
+/* Debugger information will be in DBX format.  */
+
+#define READ_DBX_FORMAT
+
+/* Offset from address of function to start of its code.
+   Zero on most machines.  */
+
+#define FUNCTION_START_OFFSET 2
+
+/* Advance PC across any function entry prologue instructions
+   to reach some "real" code.  */
+
+#define SKIP_PROLOGUE(pc)	\
+{ register int op = (unsigned char) read_memory_integer (pc, 1);  \
+  if (op == 0x11) pc += 2;  /* skip brb */			  \
+  if (op == 0x13) pc += 3;  /* skip brw */			  \
+  if (op == 0x2c &&						  \
+      ((unsigned char) read_memory_integer (pc+2, 1)) == 0x5e)	  \
+    pc += 3;  /* skip subl2 */					  \
+  if (op == 0xe9 &&						  \
+      ((unsigned char) read_memory_integer (pc+1, 1)) == 0xae &&  \
+      ((unsigned char) read_memory_integer(pc+3, 1)) == 0x5e)	  \
+     pc += 4;  /* skip movab */					  \
+  if (op == 0xe9 &&						  \
+      ((unsigned char) read_memory_integer (pc+1, 1)) == 0xce &&  \
+      ((unsigned char) read_memory_integer(pc+4, 1)) == 0x5e)	  \
+    pc += 5;  /* skip movab */					  \
+  if (op == 0xe9 &&						  \
+      ((unsigned char) read_memory_integer (pc+1, 1)) == 0xee &&  \
+      ((unsigned char) read_memory_integer(pc+6, 1)) == 0x5e)	  \
+    pc += 7;  /* skip movab */					  \
+}
+
+/* Immediately after a function call, return the saved pc.
+   Can't always go through the frames for this because on some machines
+   the new frame is not set up until the new function executes
+   some instructions.  */
+
+#define SAVED_PC_AFTER_CALL(frame) FRAME_SAVED_PC(frame)
+
+/* Wrong for cross-debugging.  I don't know the real values.  */
+#define TARGET_UPAGES UPAGES
+#define TARGET_NBPG NBPG
+
+/* This is the amount to subtract from u.u_ar0
+   to get the offset in the core file of the register values.  */
+
+#define KERNEL_U_ADDR (0xc0000000 - (TARGET_UPAGES * TARGET_NBPG))
+
+/* Address of end of stack space.  */
+
+#define STACK_END_ADDR (0xc0000000 - (TARGET_UPAGES * TARGET_NBPG))
+
+/* On BSD, sigtramp is in the u area.  Can't check the exact
+   addresses because for cross-debugging we don't have target include
+   files around.  This should be close enough.  */
+#define IN_SIGTRAMP(pc, name) ((pc) >= STACK_END_ADDR && (pc < 0xc0000000))
+
+/* Stack grows downward.  */
+
+#define INNER_THAN <
+
+/* Sequence of bytes for breakpoint instruction.  */
+
+#define BREAKPOINT {0x30}
+
+/* Amount PC must be decremented by after a breakpoint.
+   This is often the number of bytes in BREAKPOINT
+   but not always.  */
+
+#define DECR_PC_AFTER_BREAK 0
+
+/* Nonzero if instruction at PC is a return instruction.  */
+
+#define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 0x40)
+
+/* Return 1 if P points to an invalid floating point value.
+   LEN is the length in bytes -- not relevant on the Tahoe. */
+
+#define INVALID_FLOAT(p, len) ((*(short *) p & 0xff80) == 0x8000)
+
+/* Say how long (ordinary) registers are.  */
+
+#define REGISTER_TYPE long
+
+/* Number of machine registers */
+
+#define NUM_REGS 19
+
+/* Initializer for an array of names of registers.
+   There should be NUM_REGS strings in this initializer.  */
+
+#define REGISTER_NAMES {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12", "fp", "sp", "pc", "ps", "al", "ah"}
+
+#define FP_REGNUM 13		/* Contains address of executing stack frame */
+#define SP_REGNUM 14		/* Contains address of top of stack */
+#define PC_REGNUM 15		/* Contains program counter */
+#define PS_REGNUM 16		/* Contains processor status */
+
+#define AL_REGNUM 17		/* Contains accumulator */
+#define AH_REGNUM 18
+
+/* Total amount of space needed to store our copies of the machine's
+   register state, the array `registers'.  */
+
+#define REGISTER_BYTES (19*4)
+
+/* Index within `registers' of the first byte of the space for
+   register N.  */
+
+#define REGISTER_BYTE(N) ((N) * 4)
+
+/* Number of bytes of storage in the actual machine representation
+   for register N.  On the tahoe, all regs are 4 bytes.  */
+
+#define REGISTER_RAW_SIZE(N) 4
+
+/* Number of bytes of storage in the program's representation
+   for register N.  On the tahoe, all regs are 4 bytes.  */
+
+#define REGISTER_VIRTUAL_SIZE(N) 4
+
+/* Largest value REGISTER_RAW_SIZE can have.  */
+
+#define MAX_REGISTER_RAW_SIZE 4
+
+/* Largest value REGISTER_VIRTUAL_SIZE can have.  */
+
+#define MAX_REGISTER_VIRTUAL_SIZE 4
+
+/* Nonzero if register N requires conversion
+   from raw format to virtual format.  */
+
+#define REGISTER_CONVERTIBLE(N) 0
+
+/* Convert data from raw format for register REGNUM
+   to virtual format for register REGNUM.  */
+
+#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO)	\
+  bcopy ((FROM), (TO), 4);
+
+/* Convert data from virtual format for register REGNUM
+   to raw format for register REGNUM.  */
+
+#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO)	\
+  bcopy ((FROM), (TO), 4);
+
+/* Return the GDB type object for the "standard" data type
+   of data in register N.  */
+
+#define REGISTER_VIRTUAL_TYPE(N) builtin_type_int
+
+/* Store the address of the place in which to copy the structure the
+   subroutine will return.  This is called from call_function. */
+
+#define STORE_STRUCT_RETURN(ADDR, SP) \
+  { write_register (1, (ADDR)); }
+
+/* Extract from an array REGBUF containing the (raw) register state
+   a function return value of type TYPE, and copy that, in virtual format,
+   into VALBUF.  */
+
+#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
+  bcopy (REGBUF, VALBUF, TYPE_LENGTH (TYPE))
+
+/* Write into appropriate registers a function return value
+   of type TYPE, given in virtual format.  */
+
+#define STORE_RETURN_VALUE(TYPE,VALBUF) \
+  write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
+
+/* Extract from an array REGBUF containing the (raw) register state
+   the address in which a function should return its structure value,
+   as a CORE_ADDR (or an expression that can be used as one).  */
+
+#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
+
+/* Describe the pointer in each stack frame to the previous stack frame
+   (its caller).
+
+   FRAME_CHAIN takes a frame's nominal address
+   and produces the frame's chain-pointer.
+
+   FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
+   and produces the nominal address of the caller frame.
+
+   However, if FRAME_CHAIN_VALID returns zero,
+   it means the given frame is the outermost one and has no caller.
+   In that case, FRAME_CHAIN_COMBINE is not used.  */
+
+/* In the case of the Tahoe, the frame's nominal address is the FP value,
+   and it points to the old FP */
+
+#define FRAME_CHAIN(thisframe)  \
+  (outside_startup_file ((thisframe)->pc) ? \
+   read_memory_integer ((thisframe)->frame, 4) :\
+   0)
+
+#define FRAME_CHAIN_VALID(chain, thisframe) \
+  (chain != 0 && (outside_startup_file (FRAME_SAVED_PC (thisframe))))
+
+#define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
+
+/* Define other aspects of the stack frame.  */
+
+/* Saved PC */
+
+#define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame - 8, 4))
+
+/* In most of GDB, getting the args address is too important to
+   just say "I don't know". */
+
+#define FRAME_ARGS_ADDRESS(fi) ((fi)->frame+4)
+
+/* Address to use as an anchor for finding local variables */
+
+#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
+
+/* Return number of args passed to a frame.
+   Can return -1, meaning no way to tell.  */
+
+#define FRAME_NUM_ARGS(numargs, fi)  \
+{ numargs = ((0xffff & read_memory_integer(((fi)->frame-4),4)) - 4) >> 2; }
+
+/* Return number of bytes at start of arglist that are not really args.  */
+
+#define FRAME_ARGS_SKIP 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.  */
+
+#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
+{ register int regnum;     \
+  register int rmask = read_memory_integer ((frame_info)->frame-4, 4) >> 16;\
+  register CORE_ADDR next_addr;     \
+  bzero (&frame_saved_regs, sizeof frame_saved_regs);     \
+  next_addr = (frame_info)->frame - 8;     \
+  for (regnum = 12; regnum >= 0; regnum--, rmask <<= 1)  \
+    (frame_saved_regs).regs[regnum] = (rmask & 0x1000) ? (next_addr -= 4) : 0;\
+  (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 4;  \
+  (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame - 8;  \
+  (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame;      \
+}
+
+/* Things needed for making the inferior call functions.  */
+
+/* Push an empty stack frame, to record the current PC, etc.  */
+
+#define PUSH_DUMMY_FRAME \
+{ register CORE_ADDR sp = read_register (SP_REGNUM);	\
+  register int regnum;					\
+printf("PUSH_DUMMY_FRAME\n");				\
+  sp = push_word (sp, read_register (FP_REGNUM));	\
+  write_register (FP_REGNUM, sp);			\
+  sp = push_word (sp, 0x1fff0004);   /*SAVE MASK*/	\
+  sp = push_word (sp, read_register (PC_REGNUM));	\
+  for (regnum = 12; regnum >= 0; regnum--)		\
+    sp = push_word (sp, read_register (regnum));	\
+  write_register (SP_REGNUM, sp);			\
+}
+
+/* Discard from the stack the innermost frame, restoring all registers.  */
+
+#define POP_FRAME  \
+{ register CORE_ADDR fp = read_register (FP_REGNUM);			\
+  register int regnum;							\
+  register int regmask = read_memory_integer (fp-4, 4);			\
+printf("POP_FRAME\n");							\
+  regmask >>= 16;                                               	\
+  write_register (SP_REGNUM, fp+4);	                           	\
+  write_register (PC_REGNUM, read_memory_integer(fp-8, 4));	  	\
+  write_register (FP_REGNUM, read_memory_integer(fp, 4));  		\
+  fp -= 8;								\
+  for (regnum = 12; regnum >= 0; regnum--, regmask <<= 1)		\
+    if (regmask & 0x1000)                                            	\
+      write_register (regnum, read_memory_integer (fp-=4, 4));		\
+  flush_cached_frames ();						\
+  set_current_frame (create_new_frame (read_register (FP_REGNUM),	\
+					read_pc ())); }
+
+/* This sequence of words is the instructions
+     calls #69, @#32323232
+     bpt
+   Note this is 8 bytes.  */
+
+#define CALL_DUMMY {0xbf699f32, 0x32323230}
+
+/* Start execution at beginning of dummy */
+
+#define CALL_DUMMY_START_OFFSET 0
+
+/* Insert the specified number of args and function address
+   into a call sequence of the above form stored at DUMMYNAME.  */
+
+#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, type)   \
+{ int temp = (int) fun;				\
+  *((char *) dummyname + 1) = nargs;		\
+  bcopy(&temp,(char *)dummyname+3,4); }
+
diff --git a/gdb/xm-tahoe.h b/gdb/xm-tahoe.h
new file mode 100644
index 0000000..924fffa
--- /dev/null
+++ b/gdb/xm-tahoe.h
@@ -0,0 +1,147 @@
+/* Definitions to make GDB hosted on a tahoe running 4.3-Reno
+   Copyright (C) 1986, 1987, 1989, 1991 Free Software Foundation, Inc.
+
+This file is part of GDB.
+
+GDB 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 1, or (at your option)
+any later version.
+
+GDB 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 GDB; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+/*
+ * Ported by the State University of New York at Buffalo by the Distributed
+ * Computer Systems Lab, Department of Computer Science, 1991.
+ */
+
+/*
+ * These first two are kludges to get this thing to compile under Reno (or
+ * at least the Reno running on okeeffe). It seems there are a few problems
+ * with the include files.
+ */
+
+/* to compile infrun.c -
+   don't allow sys/dir.h to be included, it gets redefined and
+   by ufs/dir.h and screws up my life! */
+#define _DIRENT_
+
+/* to compile remote.c -
+   when sys/ioctl.h get's called we need USE_OLD_TTY defined
+   so that ioctl_compat.h will be included.  latter, sgtty.h
+   tries to define USE_OLD_TTY and call sys/ioctl.h but it's
+   too late */
+#define USE_OLD_TTY
+
+/* Get rid of any system-imposed stack limit if possible.  */
+
+#define SET_STACK_LIMIT_HUGE
+
+#define REGISTER_U_ADDR(addr, blockend, regno)		\
+{ addr = blockend - 100 + regno * 4;			\
+  if (regno == PC_REGNUM) addr = blockend - 8;		\
+  if (regno == PS_REGNUM) addr = blockend - 4;		\
+  if (regno == FP_REGNUM) addr = blockend - 40;	        \
+  if (regno == SP_REGNUM) addr = blockend - 36;         \
+  if (regno == AL_REGNUM) addr = blockend - 20;       \
+  if (regno == AH_REGNUM) addr = blockend - 24;}
+
+/* Interface definitions for kernel debugger KDB.  */
+
+/* Map machine fault codes into signal numbers.
+   First subtract 0, divide by 4, then index in a table.
+   Faults for which the entry in this table is 0
+   are not handled by KDB; the program's own trap handler
+   gets to handle then.  */
+
+#define FAULT_CODE_ORIGIN 0
+#define FAULT_CODE_UNITS 4
+#define FAULT_TABLE    \
+{ 0, SIGKILL, SIGSEGV, 0, 0, 0, 0, 0, \
+  0, 0, SIGTRAP, SIGTRAP, 0, 0, 0, 0, \
+  0, 0, 0, 0, 0, 0, 0, 0}
+
+/* Start running with a stack stretching from BEG to END.
+   BEG and END should be symbols meaningful to the assembler.
+   This is used only for kdb.  */
+
+#define INIT_STACK(beg, end)  \
+{ asm (".globl end");         \
+  asm ("movl $ end, sp");      \
+  asm ("clrl fp"); }
+
+/* Push the frame pointer register on the stack.  */
+
+#define PUSH_FRAME_PTR        \
+  asm ("pushl fp");
+
+/* Copy the top-of-stack to the frame pointer register.  */
+
+#define POP_FRAME_PTR  \
+  asm ("movl (sp), fp");
+
+/* After KDB is entered by a fault, push all registers
+   that GDB thinks about (all NUM_REGS of them),
+   so that they appear in order of ascending GDB register number.
+   The fault code will be on the stack beyond the last register.  */
+
+#define PUSH_REGISTERS        \
+{ asm ("pushl 8(sp)");        \
+  asm ("pushl 8(sp)");        \
+  asm ("pushal 0x41(sp)");    \
+  asm ("pushl r0" );       \
+  asm ("pushl r1" );       \
+  asm ("pushl r2" );       \
+  asm ("pushl r3" );       \
+  asm ("pushl r4" );       \
+  asm ("pushl r5" );       \
+  asm ("pushl r6" );       \
+  asm ("pushl r7" );       \
+  asm ("pushl r8" );       \
+  asm ("pushl r9" );       \
+  asm ("pushl r10" );       \
+  asm ("pushl r11" );       \
+  asm ("pushl r12" );       \
+  asm ("pushl fp" );       \
+  asm ("pushl sp" );       \
+  asm ("pushl pc" );       \
+  asm ("pushl ps" );       \
+  asm ("pushl aclo" );       \
+  asm ("pushl achi" );       \
+}
+
+/* Assuming the registers (including processor status) have been
+   pushed on the stack in order of ascending GDB register number,
+   restore them and return to the address in the saved PC register.  */
+
+#define POP_REGISTERS      \
+{                          \
+  asm ("movl (sp)+, achi");   \
+  asm ("movl (sp)+, aclo");   \
+  asm ("movl (sp)+, ps");   \
+  asm ("movl (sp)+, pc");   \
+  asm ("movl (sp)+, sp");   \
+  asm ("movl (sp)+, fp");   \
+  asm ("movl (sp)+, r12");   \
+  asm ("movl (sp)+, r11");   \
+  asm ("movl (sp)+, r10");   \
+  asm ("movl (sp)+, r9");   \
+  asm ("movl (sp)+, r8");   \
+  asm ("movl (sp)+, r7");   \
+  asm ("movl (sp)+, r6");   \
+  asm ("movl (sp)+, r5");   \
+  asm ("movl (sp)+, r4");   \
+  asm ("movl (sp)+, r3");   \
+  asm ("movl (sp)+, r2");   \
+  asm ("movl (sp)+, r1");   \
+  asm ("movl (sp)+, r0");   \
+  asm ("subl2 $8,(sp)");   \
+  asm ("movl (sp),sp");    \
+  asm ("rei"); }