Johns release

1 files changed, 240 insertions, 0 deletions

diff --git a/gdb/vax-pinsn.c b/gdb/vax-pinsn.c
new file mode 100644
index 0000000000..4c159af804
--- /dev/null
+++ b/gdb/vax-pinsn.c
@@ -0,0 +1,240 @@
+/* Print vax instructions for GDB, the GNU debugger.
+   Copyright (C) 1986, 1989 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.  */
+
+#include <stdio.h>
+
+#include "defs.h"
+#include "param.h"
+#include "symtab.h"
+#include "vax-opcode.h"
+
+/* Vax 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 vax 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 (' ', 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;
+{
+  register int regnum = *p & 0xf;
+  float floatlitbuf;
+
+  if (*d == 'b')
+    {
+      if (d[1] == 'b')
+	fprintf (stream, "0x%x", addr + *p++ + 1);
+      else
+	{
+	  fprintf (stream, "0x%x", addr + *(short *)p + 2);
+	  p += 2;
+	}
+    }
+  else
+    switch ((*p++ >> 4) & 0xf)
+      {
+      case 0:
+      case 1:
+      case 2:
+      case 3:			/* Literal 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:			/* Autoincrement deferred */
+	fputc ('@', stream);
+	if (regnum == PC_REGNUM)
+	  {
+	    fputc ('#', stream);
+	    print_address (*(long *)p, stream);
+	    p += 4;
+	    break;
+	  }
+      case 8:			/* Autoincrement */
+	if (regnum == PC_REGNUM)
+	  {
+	    fputc ('#', stream);
+	    switch (d[1])
+	      {
+	      case 'b':
+		fprintf (stream, "%d", *p++);
+		break;
+
+	      case 'w':
+		fprintf (stream, "%d", *(short *)p);
+		p += 2;
+		break;
+
+	      case 'l':
+		fprintf (stream, "%d", *(long *)p);
+		p += 4;
+		break;
+
+	      case 'q':
+		fprintf (stream, "0x%x%08x", ((long *)p)[1], ((long *)p)[0]);
+		p += 8;
+		break;
+
+	      case 'o':
+		fprintf (stream, "0x%x%08x%08x%08x",
+			 ((long *)p)[3], ((long *)p)[2],
+			 ((long *)p)[1], ((long *)p)[0]);
+		p += 16;
+		break;
+
+	      case 'f':
+		if (INVALID_FLOAT (p, 4))
+		  fprintf (stream, "<<invalid float 0x%x>>", *(int *) p);
+		else
+		  fprintf (stream, "%f", *(float *) p);
+		p += 4;
+		break;
+
+	      case 'd':
+		if (INVALID_FLOAT (p, 8))
+		  fprintf (stream, "<<invalid float 0x%x%08x>>",
+			   ((long *)p)[1], ((long *)p)[0]);
+		else
+		  fprintf (stream, "%f", *(double *) p);
+		p += 8;
+		break;
+
+	      case 'g':
+		fprintf (stream, "g-float");
+		p += 8;
+		break;
+
+	      case 'h':
+		fprintf (stream, "h-float");
+		p += 16;
+		break;
+
+	      }
+	  }
+	else
+	  fprintf (stream, "(%s)+", reg_names[regnum]);
+	break;
+
+      case 11:			/* Byte displacement deferred */
+	fputc ('@', stream);
+      case 10:			/* Byte displacement */
+	if (regnum == PC_REGNUM)
+	  print_address (addr + *p + 2, stream);
+	else
+	  fprintf (stream, "%d(%s)", *p, reg_names[regnum]);
+	p += 1;
+	break;
+
+      case 13:			/* Word displacement deferred */
+	fputc ('@', stream);
+      case 12:			/* Word displacement */
+	if (regnum == PC_REGNUM)
+	  print_address (addr + *(short *)p + 3, stream);
+	else
+	  fprintf (stream, "%d(%s)", *(short *)p, reg_names[regnum]);
+	p += 2;
+	break;
+
+      case 15:			/* Long displacement deferred */
+	fputc ('@', stream);
+      case 14:			/* Long displacement */
+	if (regnum == PC_REGNUM)
+	  print_address (addr + *(long *)p + 5, stream);
+	else
+	  fprintf (stream, "%d(%s)", *(long *)p, reg_names[regnum]);
+	p += 4;
+      }
+
+  return (unsigned char *) p;
+}