aboutsummaryrefslogtreecommitdiff
path: root/gdb/vax-pinsn.c
diff options
context:
space:
mode:
Diffstat (limited to 'gdb/vax-pinsn.c')
-rw-r--r--gdb/vax-pinsn.c240
1 files changed, 240 insertions, 0 deletions
diff --git a/gdb/vax-pinsn.c b/gdb/vax-pinsn.c
new file mode 100644
index 0000000..4c159af
--- /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;
+}