382 lines
7.2 KiB
C
382 lines
7.2 KiB
C
/* Disassemble h8300 instructions.
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Copyright (C) 1993 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#define DEFINE_TABLE
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#define h8_opcodes h8ops
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#include "opcode/h8300.h"
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#include "dis-asm.h"
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/* Run through the opcodes and sort them into order to make them easy
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to disassemble
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*/
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static void
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bfd_h8_disassemble_init ()
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{
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unsigned int i;
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struct h8_opcode *p;
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for (p = h8_opcodes; p->name; p++)
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{
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int n1 = 0;
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int n2 = 0;
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if ((int) p->data.nib[0] < 16)
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{
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n1 = (int) p->data.nib[0];
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}
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else
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n1 = 0;
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if ((int) p->data.nib[1] < 16)
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{
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n2 = (int) p->data.nib[1];
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}
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else
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n2 = 0;
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/* Just make sure there are an even number of nibbles in it, and
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that the count is the same s the length */
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for (i = 0; p->data.nib[i] != E; i++)
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/*EMPTY*/ ;
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if (i & 1)
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abort ();
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p->length = i / 2;
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}
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}
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unsigned int
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bfd_h8_disassemble (addr, info, hmode)
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bfd_vma addr;
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disassemble_info *info;
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int hmode;
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{
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/* Find the first entry in the table for this opcode */
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static CONST char *regnames[] =
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{
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"r0h", "r1h", "r2h", "r3h", "r4h", "r5h", "r6h", "r7h",
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"r0l", "r1l", "r2l", "r3l", "r4l", "r5l", "r6l", "r7l"};
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static CONST char *wregnames[] =
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{
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"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
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"e0", "e1", "e2", "e3", "e4", "e5", "e6", "e7"
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};
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static CONST char *lregnames[] =
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{
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"er0", "er1", "er2", "er3", "er4", "er5", "er6", "er7",
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"er0", "er1", "er2", "er3", "er4", "er5", "er6", "er7"
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}
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;
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int rs = 0;
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int rd = 0;
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int rdisp = 0;
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int abs = 0;
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int plen = 0;
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static boolean init;
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struct h8_opcode *q = h8_opcodes;
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char CONST **pregnames = hmode ? lregnames : wregnames;
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int status;
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unsigned char data[20];
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void *stream = info->stream;
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fprintf_ftype fprintf = info->fprintf_func;
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if (!init)
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{
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bfd_h8_disassemble_init ();
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init = true;
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}
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status = info->read_memory_func(addr, data, 2, info);
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if (status != 0)
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{
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info->memory_error_func(status, addr, info);
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return -1;
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}
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status = info->read_memory_func(addr, data+2, 8, info);
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/* Find the exact opcode/arg combo */
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while (q->name)
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{
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op_type *nib;
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unsigned int len = 0;
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nib = q->data.nib;
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while (1)
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{
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op_type looking_for = *nib;
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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)
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{
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if (looking_for != thisnib)
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goto fail;
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}
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else
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{
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if ((int) looking_for & (int) B31)
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{
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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) B31);
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}
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if ((int) looking_for & (int) B30)
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{
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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);
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}
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if (looking_for & DBIT)
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{
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if ((looking_for & 5) != (thisnib &5)) goto fail;
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abs = (thisnib & 0x8) ? 2 : 1;
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}
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else if (looking_for & (REG | IND|INC|DEC))
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{
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if (looking_for & SRC)
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{
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rs = thisnib;
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}
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else
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{
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rd = thisnib;
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}
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}
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else if (looking_for & L_16)
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{
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abs = (data[len >> 1]) * 256 + data[(len + 2) >> 1];
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plen = 16;
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}
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else if(looking_for & ABSJMP)
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{
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abs =
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(data[1] << 16)
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| (data[2] << 8)
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| (data[3]);
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}
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else if (looking_for & L_32)
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{
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int i = len >> 1;
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abs = (data[i] << 24)
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| (data[i + 1] << 16)
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| (data[i + 2] << 8)
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| (data[i+ 3]);
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plen =32;
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}
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else if (looking_for & L_24)
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{
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int i = len >> 1;
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abs = (data[i] << 16) | (data[i + 1] << 8)| (data[i+
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2]);
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plen =24;
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}
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else if (looking_for & IGNORE)
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{
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}
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else if (looking_for & DISPREG)
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{
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rdisp = thisnib;
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}
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else if (looking_for & KBIT)
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{
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switch (thisnib)
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{
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case 9:
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abs = 4;
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break;
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case 8:
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abs = 2;
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break;
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case 0:
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abs = 1;
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break;
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}
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}
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else if (looking_for & L_8)
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{
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plen = 8;
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abs = data[len >> 1];
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}
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else if (looking_for & L_3)
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{
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plen = 3;
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abs = thisnib;
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}
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else if (looking_for == E)
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{
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{
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int i;
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for (i = 0; i < q->length; i++)
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{
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fprintf (stream, "%02x ", data[i]);
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}
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for (; i < 6; i++)
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{
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fprintf (stream, " ");
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}
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}
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fprintf (stream, "%s\t", q->name);
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/* Fill in the args */
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{
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op_type *args = q->args.nib;
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int hadone = 0;
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while (*args != E)
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{
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int x = *args;
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if (hadone)
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fprintf (stream, ",");
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if (x & (IMM|KBIT|DBIT))
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{
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fprintf (stream, "#0x%x", (unsigned) abs);
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}
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else if (x & REG)
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{
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int rn = (x & DST) ? rd : rs;
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switch (x & SIZE)
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{
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case L_8:
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fprintf (stream, "%s", regnames[rn]);
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break;
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case L_16:
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fprintf (stream, "%s", wregnames[rn]);
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break;
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case L_P:
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case L_32:
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fprintf (stream, "%s", lregnames[rn]);
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break;
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}
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}
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else if (x & INC)
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{
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fprintf (stream, "@%s+", pregnames[rs]);
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}
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else if (x & DEC)
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{
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fprintf (stream, "@-%s", pregnames[rd]);
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}
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else if (x & IND)
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{
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int rn = (x & DST) ? rd : rs;
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fprintf (stream, "@%s", pregnames[rn]);
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}
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else if (x & (ABS|ABSJMP|ABSMOV))
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{
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fprintf (stream, "@0x%x:%d", (unsigned) abs, plen);
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}
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else if (x & MEMIND)
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{
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fprintf (stream, "@@%d (%x)", abs, abs);
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}
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else if (x & PCREL)
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{
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fprintf (stream, ".%s%d (%x)", (char) abs > 0 ? "+" : "", (char) abs,
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addr + (char) abs + 2);
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}
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else if (x & DISP)
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{
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fprintf (stream, "@(0x%x:%d,%s)", abs,plen, pregnames[rdisp]);
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}
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else if (x & CCR)
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{
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fprintf (stream, "ccr");
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}
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else
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fprintf (stream, "Hmmmm %x", x);
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hadone = 1;
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args++;
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}
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}
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return q->length;
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}
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else
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{
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fprintf (stream, "Dont understand %x \n", looking_for);
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}
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}
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len++;
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nib++;
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}
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fail:
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q++;
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}
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/* Fell of the end */
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fprintf (stream, "%02x %02x .word\tH'%x,H'%x",
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data[0], data[1],
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data[0], data[1]);
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return 2;
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}
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int
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print_insn_h8300 (addr, info)
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bfd_vma addr;
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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)
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bfd_vma addr;
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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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