binutils-gdb/opcodes/h8300-dis.c

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/* Disassemble h8300 instructions.
Copyright (C) 1993, 1998, 2000 Free Software Foundation, Inc.
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#define DEFINE_TABLE
#include "sysdep.h"
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#define h8_opcodes h8ops
#include "opcode/h8300.h"
#include "dis-asm.h"
#include "opintl.h"
/* Run through the opcodes and sort them into order to make them easy
to disassemble. */
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static void
bfd_h8_disassemble_init ()
{
unsigned int i;
struct h8_opcode *p;
for (p = h8_opcodes; p->name; p++)
{
int n1 = 0;
int n2 = 0;
if ((int) p->data.nib[0] < 16)
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n1 = (int) p->data.nib[0];
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else
n1 = 0;
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if ((int) p->data.nib[1] < 16)
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n2 = (int) p->data.nib[1];
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else
n2 = 0;
/* Just make sure there are an even number of nibbles in it, and
that the count is the same as the length. */
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for (i = 0; p->data.nib[i] != E; i++)
;
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if (i & 1)
abort ();
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p->length = i / 2;
}
}
unsigned int
bfd_h8_disassemble (addr, info, mode)
bfd_vma addr;
disassemble_info *info;
int mode;
{
/* Find the first entry in the table for this opcode. */
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static CONST char *regnames[] =
{
"r0h", "r1h", "r2h", "r3h", "r4h", "r5h", "r6h", "r7h",
"r0l", "r1l", "r2l", "r3l", "r4l", "r5l", "r6l", "r7l"
};
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static CONST char *wregnames[] =
{
"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
"e0", "e1", "e2", "e3", "e4", "e5", "e6", "e7"
};
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static CONST char *lregnames[] =
{
"er0", "er1", "er2", "er3", "er4", "er5", "er6", "er7",
"er0", "er1", "er2", "er3", "er4", "er5", "er6", "er7"
};
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int rs = 0;
int rd = 0;
int rdisp = 0;
int abs = 0;
int bit = 0;
int plen = 0;
static boolean init = 0;
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struct h8_opcode *q;
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char CONST **pregnames = mode != 0 ? lregnames : wregnames;
int status;
int l;
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unsigned char data[20];
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void *stream = info->stream;
fprintf_ftype fprintf = info->fprintf_func;
if (!init)
{
bfd_h8_disassemble_init ();
init = 1;
}
status = info->read_memory_func (addr, data, 2, info);
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if (status != 0)
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{
info->memory_error_func (status, addr, info);
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return -1;
}
for (l = 2; status == 0 && l < 10; l += 2)
status = info->read_memory_func (addr + l, data + l, 2, info);
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/* Find the exact opcode/arg combo. */
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for (q = h8_opcodes; q->name; q++)
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{
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op_type *nib = q->data.nib;
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unsigned int len = 0;
while (1)
{
op_type looking_for = *nib;
int thisnib = data[len >> 1];
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thisnib = (len & 1) ? (thisnib & 0xf) : ((thisnib >> 4) & 0xf);
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if (looking_for < 16 && looking_for >= 0)
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{
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if (looking_for != thisnib)
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goto fail;
}
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else
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{
if ((int) looking_for & (int) B31)
{
if (!(((int) thisnib & 0x8) != 0))
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goto fail;
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looking_for = (op_type) ((int) looking_for & ~(int) B31);
}
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if ((int) looking_for & (int) B30)
{
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if (!(((int) thisnib & 0x8) == 0))
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goto fail;
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looking_for = (op_type) ((int) looking_for & ~(int) B30);
}
if (looking_for & DBIT)
{
/* Exclude adds/subs by looking at bit 0 and 2, and
make sure the operand size, either w or l,
matches by looking at bit 1. */
if ((looking_for & 7) != (thisnib & 7))
goto fail;
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abs = (thisnib & 0x8) ? 2 : 1;
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}
else if (looking_for & (REG | IND | INC | DEC))
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{
if (looking_for & SRC)
rs = thisnib;
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else
rd = thisnib;
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}
else if (looking_for & L_16)
{
abs = (data[len >> 1]) * 256 + data[(len + 2) >> 1];
plen = 16;
}
else if (looking_for & ABSJMP)
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{
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abs = (data[1] << 16) | (data[2] << 8) | (data[3]);
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}
else if (looking_for & MEMIND)
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{
abs = data[1];
}
else if (looking_for & L_32)
{
int i = len >> 1;
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abs = (data[i] << 24)
| (data[i + 1] << 16)
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| (data[i + 2] << 8)
| (data[i + 3]);
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plen = 32;
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}
else if (looking_for & L_24)
{
int i = len >> 1;
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abs = (data[i] << 16) | (data[i + 1] << 8) | (data[i + 2]);
plen = 24;
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}
else if (looking_for & IGNORE)
{
;
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}
else if (looking_for & DISPREG)
{
rdisp = thisnib;
}
else if (looking_for & KBIT)
{
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switch (thisnib)
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{
case 9:
abs = 4;
break;
case 8:
abs = 2;
break;
case 0:
abs = 1;
break;
default:
goto fail;
}
}
else if (looking_for & L_8)
{
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plen = 8;
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abs = data[len >> 1];
}
else if (looking_for & L_3)
{
bit = thisnib & 0x7;
}
else if (looking_for & L_2)
{
plen = 2;
abs = thisnib & 0x3;
}
else if (looking_for & MACREG)
{
abs = (thisnib == 3);
}
else if (looking_for == E)
{
int i;
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for (i = 0; i < q->length; i++)
fprintf (stream, "%02x ", data[i]);
for (; i < 6; i++)
fprintf (stream, " ");
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fprintf (stream, "%s\t", q->name);
/* Gross. Disgusting. */
if (strcmp (q->name, "ldm.l") == 0)
{
int count, high;
count = (data[1] >> 4) & 0x3;
high = data[3] & 0x7;
fprintf (stream, "@sp+,er%d-er%d", high - count, high);
return q->length;
}
if (strcmp (q->name, "stm.l") == 0)
{
int count, low;
count = (data[1] >> 4) & 0x3;
low = data[3] & 0x7;
fprintf (stream, "er%d-er%d,@-sp", low, low + count);
return q->length;
}
/* Fill in the args. */
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{
op_type *args = q->args.nib;
int hadone = 0;
while (*args != E)
{
int x = *args;
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if (hadone)
fprintf (stream, ",");
if (x & L_3)
{
fprintf (stream, "#0x%x", (unsigned) bit);
}
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else if (x & (IMM | KBIT | DBIT))
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{
/* Bletch. For shal #2,er0 and friends. */
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if (*(args + 1) & SRC_IN_DST)
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abs = 2;
fprintf (stream, "#0x%x", (unsigned) abs);
}
else if (x & REG)
{
int rn = (x & DST) ? rd : rs;
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switch (x & SIZE)
{
case L_8:
fprintf (stream, "%s", regnames[rn]);
break;
case L_16:
fprintf (stream, "%s", wregnames[rn]);
break;
case L_P:
case L_32:
fprintf (stream, "%s", lregnames[rn]);
break;
}
}
else if (x & MACREG)
{
fprintf (stream, "mac%c", abs ? 'l' : 'h');
}
else if (x & INC)
{
fprintf (stream, "@%s+", pregnames[rs]);
}
else if (x & DEC)
{
fprintf (stream, "@-%s", pregnames[rd]);
}
else if (x & IND)
{
int rn = (x & DST) ? rd : rs;
fprintf (stream, "@%s", pregnames[rn]);
}
else if (x & ABS8MEM)
{
fprintf (stream, "@0x%x:8", (unsigned) abs);
}
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else if (x & (ABS | ABSJMP))
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{
fprintf (stream, "@0x%x:%d", (unsigned) abs, plen);
}
else if (x & MEMIND)
{
fprintf (stream, "@@%d (%x)", abs, abs);
}
else if (x & PCREL)
{
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if (x & L_16)
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{
abs += 2;
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fprintf (stream,
".%s%d (%x)",
(short) abs > 0 ? "+" : "",
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(short) abs, addr + (short) abs + 2);
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}
else
{
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fprintf (stream,
".%s%d (%x)",
(char) abs > 0 ? "+" : "",
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(char) abs, addr + (char) abs + 2);
}
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}
else if (x & DISP)
{
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fprintf (stream, "@(0x%x:%d,%s)",
abs, plen, pregnames[rdisp]);
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}
else if (x & CCR)
{
fprintf (stream, "ccr");
}
else if (x & EXR)
{
fprintf (stream, "exr");
}
else
/* xgettext:c-format */
fprintf (stream, _("Hmmmm %x"), x);
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hadone = 1;
args++;
}
}
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return q->length;
}
else
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/* xgettext:c-format */
fprintf (stream, _("Don't understand %x \n"), looking_for);
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}
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len++;
nib++;
}
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fail:
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;
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}
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/* Fell off the end. */
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fprintf (stream, "%02x %02x .word\tH'%x,H'%x",
data[0], data[1],
data[0], data[1]);
return 2;
}
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int
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print_insn_h8300 (addr, info)
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bfd_vma addr;
disassemble_info *info;
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{
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return bfd_h8_disassemble (addr, info, 0);
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}
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int
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print_insn_h8300h (addr, info)
bfd_vma addr;
disassemble_info *info;
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{
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return bfd_h8_disassemble (addr, info, 1);
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}
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int
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print_insn_h8300s (addr, info)
bfd_vma addr;
disassemble_info *info;
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{
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return bfd_h8_disassemble (addr, info, 2);
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}