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authorJim Kingdon <jkingdon@engr.sgi.com>1991-04-29 05:28:45 +0000
committerJim Kingdon <jkingdon@engr.sgi.com>1991-04-29 05:28:45 +0000
commitcb173f45df703d3fefdae724846b87d41e9ed4f0 (patch)
tree215f24dc74da256433735937dd84e6bfede3e1a0 /gdb/tahoe-pinsn.c
parent122ad9abf278d8b86f00d33ff6c1c2e450d4ffc3 (diff)
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Initial revision
Diffstat (limited to 'gdb/tahoe-pinsn.c')
-rw-r--r--gdb/tahoe-pinsn.c223
1 files changed, 223 insertions, 0 deletions
diff --git a/gdb/tahoe-pinsn.c b/gdb/tahoe-pinsn.c
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+/*
+ * 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;
+}
+
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