4.4BSD/usr/src/contrib/gdb-4.7.lbl/gdb/convex-pinsn.c
/* Print Convex instructions for GDB, the GNU debugger.
Copyright 1989, 1991 Free Software Foundation, Inc.
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "defs.h"
#include "symtab.h"
/* reg (fmt_field, inst_field) --
the {first,second,third} operand of instruction as fmt_field = [ijk]
gets the value of the field from the [ijk] position of the instruction */
#define reg(a,b) ((char (*)[3])(op[fmt->a]))[inst.f0.b]
/* lit (fmt_field) -- field [ijk] is a literal (PSW, VL, eg) */
#define lit(i) op[fmt->i]
/* aj[j] -- name for A register j */
#define aj ((char (*)[3])(op[A]))
union inst {
struct {
unsigned : 7;
unsigned i : 3;
unsigned j : 3;
unsigned k : 3;
unsigned : 16;
unsigned : 32;
} f0;
struct {
unsigned : 8;
unsigned indir : 1;
unsigned len : 1;
unsigned j : 3;
unsigned k : 3;
unsigned : 16;
unsigned : 32;
} f1;
unsigned char byte[8];
unsigned short half[4];
char signed_byte[8];
short signed_half[4];
};
struct opform {
int mask; /* opcode mask */
int shift; /* opcode align */
struct formstr *formstr[3]; /* ST, E0, E1 */
};
struct formstr {
unsigned lop:8, rop:5; /* opcode */
unsigned fmt:5; /* inst format */
unsigned i:5, j:5, k:2; /* operand formats */
};
#include "convx-opcode.h"
unsigned char formdecode [] = {
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
4,4,4,4,4,4,4,4,5,5,5,5,6,6,7,8,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
};
struct opform opdecode[] = {
0x7e00, 9, format0, e0_format0, e1_format0,
0x3f00, 8, format1, e0_format1, e1_format1,
0x1fc0, 6, format2, e0_format2, e1_format2,
0x0fc0, 6, format3, e0_format3, e1_format3,
0x0700, 8, format4, e0_format4, e1_format4,
0x03c0, 6, format5, e0_format5, e1_format5,
0x01f8, 3, format6, e0_format6, e1_format6,
0x00f8, 3, format7, e0_format7, e1_format7,
0x0000, 0, formatx, formatx, formatx,
0x0f80, 7, formatx, formatx, formatx,
0x0f80, 7, formatx, formatx, formatx,
};
/* Print the 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;
{
union inst inst;
struct formstr *fmt;
register int format, op1, pfx;
int l;
read_memory (memaddr, &inst, sizeof inst);
/* Remove and note prefix, if present */
pfx = inst.half[0];
if ((pfx & 0xfff0) == 0x7ef0)
{
pfx = ((pfx >> 3) & 1) + 1;
*(long long *) &inst = *(long long *) &inst.half[1];
}
else pfx = 0;
/* Split opcode into format.op1 and look up in appropriate table */
format = formdecode[inst.byte[0]];
op1 = (inst.half[0] & opdecode[format].mask) >> opdecode[format].shift;
if (format == 9)
{
if (pfx)
fmt = formatx;
else if (inst.f1.j == 0)
fmt = &format1a[op1];
else if (inst.f1.j == 1)
fmt = &format1b[op1];
else
fmt = formatx;
}
else
fmt = &opdecode[format].formstr[pfx][op1];
/* Print it */
if (fmt->fmt == xxx)
{
/* noninstruction */
fprintf (stream, "0x%04x", pfx ? pfx : inst.half[0]);
return 2;
}
if (pfx)
pfx = 2;
fprintf (stream, "%s%s%s", lop[fmt->lop], rop[fmt->rop],
&" "[strlen(lop[fmt->lop]) + strlen(rop[fmt->rop])]);
switch (fmt->fmt)
{
case rrr: /* three register */
fprintf (stream, "%s,%s,%s", reg(i,i), reg(j,j), reg(k,k));
return pfx + 2;
case rr: /* two register */
fprintf (stream, "%s,%s", reg(i,j), reg(j,k));
return pfx + 2;
case rxr: /* two register, reversed i and j fields */
fprintf (stream, "%s,%s", reg(i,k), reg(j,j));
return pfx + 2;
case r: /* one register */
fprintf (stream, "%s", reg(i,k));
return pfx + 2;
case nops: /* no operands */
return pfx + 2;
case nr: /* short immediate, one register */
fprintf (stream, "#%d,%s", inst.f0.j, reg(i,k));
return pfx + 2;
case pcrel: /* pc relative */
print_address (memaddr + 2 * inst.signed_byte[1], stream);
return pfx + 2;
case lr: /* literal, one register */
fprintf (stream, "%s,%s", lit(i), reg(j,k));
return pfx + 2;
case rxl: /* one register, literal */
fprintf (stream, "%s,%s", reg(i,k), lit(j));
return pfx + 2;
case rlr: /* register, literal, register */
fprintf (stream, "%s,%s,%s", reg(i,j), lit(j), reg(k,k));
return pfx + 2;
case rrl: /* register, register, literal */
fprintf (stream, "%s,%s,%s", reg(i,j), reg(j,k), lit(k));
return pfx + 2;
case iml: /* immediate, literal */
if (inst.f1.len)
{
fprintf (stream, "#%#x,%s",
(inst.signed_half[1] << 16) + inst.half[2], lit(i));
return pfx + 6;
}
else
{
fprintf (stream, "#%d,%s", inst.signed_half[1], lit(i));
return pfx + 4;
}
case imr: /* immediate, register */
if (inst.f1.len)
{
fprintf (stream, "#%#x,%s",
(inst.signed_half[1] << 16) + inst.half[2], reg(i,k));
return pfx + 6;
}
else
{
fprintf (stream, "#%d,%s", inst.signed_half[1], reg(i,k));
return pfx + 4;
}
case a1r: /* memory, register */
l = print_effa (inst, stream);
fprintf (stream, ",%s", reg(i,k));
return pfx + l;
case a1l: /* memory, literal */
l = print_effa (inst, stream);
fprintf (stream, ",%s", lit(i));
return pfx + l;
case a2r: /* register, memory */
fprintf (stream, "%s,", reg(i,k));
return pfx + print_effa (inst, stream);
case a2l: /* literal, memory */
fprintf (stream, "%s,", lit(i));
return pfx + print_effa (inst, stream);
case a3: /* memory */
return pfx + print_effa (inst, stream);
case a4: /* system call */
l = 29; goto a4a5;
case a5: /* trap */
l = 27;
a4a5:
if (inst.f1.len)
{
unsigned int m = (inst.signed_half[1] << 16) + inst.half[2];
fprintf (stream, "#%d,#%d", m >> l, m & (-1 >> (32-l)));
return pfx + 6;
}
else
{
unsigned int m = inst.signed_half[1];
fprintf (stream, "#%d,#%d", m >> l, m & (-1 >> (32-l)));
return pfx + 4;
}
}
}
/* print effective address @nnn(aj), return instruction length */
int print_effa (inst, stream)
union inst inst;
FILE *stream;
{
int n, l;
if (inst.f1.len)
{
n = (inst.signed_half[1] << 16) + inst.half[2];
l = 6;
}
else
{
n = inst.signed_half[1];
l = 4;
}
if (inst.f1.indir)
printf ("@");
if (!inst.f1.j)
{
print_address (n, stream);
return l;
}
fprintf (stream, (n & 0xf0000000) == 0x80000000 ? "%#x(%s)" : "%d(%s)",
n, aj[inst.f1.j]);
return l;
}