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NetBSD/gnu/dist/gdb6/opcodes/i860-dis.c

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/* Disassembler for the i860.
Copyright 2000, 2003 Free Software Foundation, Inc.
Contributed by Jason Eckhardt <jle@cygnus.com>.
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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
#include "dis-asm.h"
#include "opcode/i860.h"
/* Later we should probably choose the prefix based on which OS flavor. */
#define I860_REG_PREFIX "%"
/* Integer register names (encoded as 0..31 in the instruction). */
static const char *const grnames[] =
{"r0", "r1", "sp", "fp", "r4", "r5", "r6", "r7",
"r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
"r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
"r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31"};
/* FP register names (encoded as 0..31 in the instruction). */
static const char *const frnames[] =
{"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
"f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15",
"f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",
"f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31"};
/* Control/status register names (encoded as 0..11 in the instruction).
Registers bear, ccr, p0, p1, p2 and p3 are XP only. */
static const char *const crnames[] =
{"fir", "psr", "dirbase", "db", "fsr", "epsr", "bear", "ccr",
"p0", "p1", "p2", "p3", "--", "--", "--", "--" };
/* True if opcode is xor, xorh, and, andh, or, orh, andnot, andnoth. */
#define BITWISE_OP(op) ((op) == 0x30 || (op) == 0x31 \
|| (op) == 0x34 || (op) == 0x35 \
|| (op) == 0x38 || (op) == 0x39 \
|| (op) == 0x3c || (op) == 0x3d \
|| (op) == 0x33 || (op) == 0x37 \
|| (op) == 0x3b || (op) == 0x3f)
/* Sign extend N-bit number. */
static int
sign_ext (unsigned int x, int n)
{
int t;
t = x >> (n - 1);
t = ((-t) << n) | x;
return t;
}
/* Print a PC-relative branch offset. VAL is the sign extended value
from the branch instruction. */
static void
print_br_address (disassemble_info *info, bfd_vma memaddr, long val)
{
long adj = (long)memaddr + 4 + (val << 2);
(*info->fprintf_func) (info->stream, "0x%08lx", adj);
/* Attempt to obtain a symbol for the target address. */
if (info->print_address_func && adj != 0)
{
(*info->fprintf_func) (info->stream, "\t// ");
(*info->print_address_func) (adj, info);
}
}
/* Print one instruction. */
int
print_insn_i860 (bfd_vma memaddr, disassemble_info *info)
{
bfd_byte buff[4];
unsigned int insn, i;
int status;
const struct i860_opcode *opcode = 0;
status = (*info->read_memory_func) (memaddr, buff, sizeof (buff), info);
if (status != 0)
{
(*info->memory_error_func) (status, memaddr, info);
return -1;
}
/* Note that i860 instructions are always accessed as little endian
data, regardless of the endian mode of the i860. */
insn = bfd_getl32 (buff);
status = 0;
i = 0;
while (i860_opcodes[i].name != NULL)
{
opcode = &i860_opcodes[i];
if ((insn & opcode->match) == opcode->match
&& (insn & opcode->lose) == 0)
{
status = 1;
break;
}
++i;
}
if (status == 0)
{
/* Instruction not in opcode table. */
(*info->fprintf_func) (info->stream, ".long %#08x", insn);
}
else
{
const char *s;
int val;
/* If this a flop (or a shrd) and its dual bit is set,
prefix with 'd.'. */
if (((insn & 0xfc000000) == 0x48000000
|| (insn & 0xfc000000) == 0xb0000000)
&& (insn & 0x200))
(*info->fprintf_func) (info->stream, "d.%s\t", opcode->name);
else
(*info->fprintf_func) (info->stream, "%s\t", opcode->name);
for (s = opcode->args; *s; s++)
{
switch (*s)
{
/* Integer register (src1). */
case '1':
(*info->fprintf_func) (info->stream, "%s%s", I860_REG_PREFIX,
grnames[(insn >> 11) & 0x1f]);
break;
/* Integer register (src2). */
case '2':
(*info->fprintf_func) (info->stream, "%s%s", I860_REG_PREFIX,
grnames[(insn >> 21) & 0x1f]);
break;
/* Integer destination register. */
case 'd':
(*info->fprintf_func) (info->stream, "%s%s", I860_REG_PREFIX,
grnames[(insn >> 16) & 0x1f]);
break;
/* Floating-point register (src1). */
case 'e':
(*info->fprintf_func) (info->stream, "%s%s", I860_REG_PREFIX,
frnames[(insn >> 11) & 0x1f]);
break;
/* Floating-point register (src2). */
case 'f':
(*info->fprintf_func) (info->stream, "%s%s", I860_REG_PREFIX,
frnames[(insn >> 21) & 0x1f]);
break;
/* Floating-point destination register. */
case 'g':
(*info->fprintf_func) (info->stream, "%s%s", I860_REG_PREFIX,
frnames[(insn >> 16) & 0x1f]);
break;
/* Control register. */
case 'c':
(*info->fprintf_func) (info->stream, "%s%s", I860_REG_PREFIX,
crnames[(insn >> 21) & 0xf]);
break;
/* 16-bit immediate (sign extend, except for bitwise ops). */
case 'i':
if (BITWISE_OP ((insn & 0xfc000000) >> 26))
(*info->fprintf_func) (info->stream, "0x%04x",
(unsigned int) (insn & 0xffff));
else
(*info->fprintf_func) (info->stream, "%d",
sign_ext ((insn & 0xffff), 16));
break;
/* 16-bit immediate, aligned (2^0, ld.b). */
case 'I':
(*info->fprintf_func) (info->stream, "%d",
sign_ext ((insn & 0xffff), 16));
break;
/* 16-bit immediate, aligned (2^1, ld.s). */
case 'J':
(*info->fprintf_func) (info->stream, "%d",
sign_ext ((insn & 0xfffe), 16));
break;
/* 16-bit immediate, aligned (2^2, ld.l, {p}fld.l, fst.l). */
case 'K':
(*info->fprintf_func) (info->stream, "%d",
sign_ext ((insn & 0xfffc), 16));
break;
/* 16-bit immediate, aligned (2^3, {p}fld.d, fst.d). */
case 'L':
(*info->fprintf_func) (info->stream, "%d",
sign_ext ((insn & 0xfff8), 16));
break;
/* 16-bit immediate, aligned (2^4, {p}fld.q, fst.q). */
case 'M':
(*info->fprintf_func) (info->stream, "%d",
sign_ext ((insn & 0xfff0), 16));
break;
/* 5-bit immediate (zero extend). */
case '5':
(*info->fprintf_func) (info->stream, "%d",
((insn >> 11) & 0x1f));
break;
/* Split 16 bit immediate (20..16:10..0). */
case 's':
val = ((insn >> 5) & 0xf800) | (insn & 0x07ff);
(*info->fprintf_func) (info->stream, "%d",
sign_ext (val, 16));
break;
/* Split 16 bit immediate, aligned. (2^0, st.b). */
case 'S':
val = ((insn >> 5) & 0xf800) | (insn & 0x07ff);
(*info->fprintf_func) (info->stream, "%d",
sign_ext (val, 16));
break;
/* Split 16 bit immediate, aligned. (2^1, st.s). */
case 'T':
val = ((insn >> 5) & 0xf800) | (insn & 0x07fe);
(*info->fprintf_func) (info->stream, "%d",
sign_ext (val, 16));
break;
/* Split 16 bit immediate, aligned. (2^2, st.l). */
case 'U':
val = ((insn >> 5) & 0xf800) | (insn & 0x07fc);
(*info->fprintf_func) (info->stream, "%d",
sign_ext (val, 16));
break;
/* 26-bit PC relative immediate (lbroff). */
case 'l':
val = sign_ext ((insn & 0x03ffffff), 26);
print_br_address (info, memaddr, val);
break;
/* 16-bit PC relative immediate (sbroff). */
case 'r':
val = sign_ext ((((insn >> 5) & 0xf800) | (insn & 0x07ff)), 16);
print_br_address (info, memaddr, val);
break;
default:
(*info->fprintf_func) (info->stream, "%c", *s);
break;
}
}
}
return sizeof (insn);
}
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