574 lines
13 KiB
C
574 lines
13 KiB
C
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/* Disassemble z8000 code.
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Copyright 1992, 1993, 1995, 1998 Free Software Foundation, Inc.
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This file is part of GNU Binutils.
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "sysdep.h"
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#include "dis-asm.h"
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#define DEFINE_TABLE
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#include "z8k-opc.h"
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#include <setjmp.h>
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typedef struct
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{
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/* These are all indexed by nibble number (i.e only every other entry
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of bytes is used, and every 4th entry of words). */
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unsigned char nibbles[24];
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unsigned char bytes[24];
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unsigned short words[24];
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/* Nibble number of first word not yet fetched. */
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int max_fetched;
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bfd_vma insn_start;
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jmp_buf bailout;
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long tabl_index;
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char instr_asmsrc[80];
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unsigned long arg_reg[0x0f];
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unsigned long immediate;
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unsigned long displacement;
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unsigned long address;
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unsigned long cond_code;
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unsigned long ctrl_code;
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unsigned long flags;
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unsigned long interrupts;
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}
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instr_data_s;
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/* Make sure that bytes from INFO->PRIVATE_DATA->BUFFER (inclusive)
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to ADDR (exclusive) are valid. Returns 1 for success, longjmps
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on error. */
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#define FETCH_DATA(info, nibble) \
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((nibble) < ((instr_data_s *)(info->private_data))->max_fetched \
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? 1 : fetch_data ((info), (nibble)))
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static int
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fetch_data (info, nibble)
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struct disassemble_info *info;
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int nibble;
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{
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unsigned char mybuf[20];
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int status;
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instr_data_s *priv = (instr_data_s *)info->private_data;
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if ((nibble % 4) != 0)
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abort ();
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status = (*info->read_memory_func) (priv->insn_start,
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(bfd_byte *) mybuf,
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nibble / 2,
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info);
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if (status != 0)
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{
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(*info->memory_error_func) (status, priv->insn_start, info);
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longjmp (priv->bailout, 1);
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}
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{
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int i;
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unsigned char *p = mybuf ;
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for (i = 0; i < nibble;)
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{
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priv->words[i] = (p[0] << 8) | p[1];
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priv->bytes[i] = *p;
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priv->nibbles[i++] = *p >> 4;
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priv->nibbles[i++] = *p &0xf;
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++p;
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priv->bytes[i] = *p;
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priv->nibbles[i++] = *p >> 4;
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priv->nibbles[i++] = *p & 0xf;
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++p;
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}
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}
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priv->max_fetched = nibble;
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return 1;
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}
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static char *codes[16] =
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{
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"f",
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"lt",
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"le",
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"ule",
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"ov/pe",
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"mi",
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"eq",
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"c/ult",
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"t",
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"ge",
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"gt",
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"ugt",
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"nov/po",
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"pl",
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"ne",
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"nc/uge"
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};
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int z8k_lookup_instr PARAMS ((unsigned char*, disassemble_info *));
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static void output_instr
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PARAMS ((instr_data_s *, unsigned long, disassemble_info *));
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static void unpack_instr PARAMS ((instr_data_s *, int, disassemble_info *));
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static void unparse_instr PARAMS ((instr_data_s *));
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static int
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print_insn_z8k (addr, info, is_segmented)
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bfd_vma addr;
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disassemble_info *info;
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int is_segmented;
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{
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instr_data_s instr_data;
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info->private_data = (PTR) &instr_data;
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instr_data.max_fetched = 0;
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instr_data.insn_start = addr;
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if (setjmp (instr_data.bailout) != 0)
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/* Error return. */
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return -1;
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instr_data.tabl_index = z8k_lookup_instr (instr_data.nibbles, info);
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if (instr_data.tabl_index > 0)
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{
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unpack_instr (&instr_data, is_segmented, info);
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unparse_instr (&instr_data);
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output_instr (&instr_data, addr, info);
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return z8k_table[instr_data.tabl_index].length;
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}
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else
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{
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FETCH_DATA (info, 4);
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(*info->fprintf_func) (info->stream, ".word %02x%02x",
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instr_data.bytes[0], instr_data.bytes[2]);
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return 2;
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}
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}
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int
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print_insn_z8001 (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 print_insn_z8k (addr, info, 1);
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}
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int
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print_insn_z8002 (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 print_insn_z8k (addr, info, 0);
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}
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int
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z8k_lookup_instr (nibbles, info)
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unsigned char *nibbles;
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disassemble_info *info;
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{
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int nibl_index, tabl_index;
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int nibl_matched;
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unsigned short instr_nibl;
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unsigned short tabl_datum, datum_class, datum_value;
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nibl_matched = 0;
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tabl_index = 0;
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while (!nibl_matched && z8k_table[tabl_index].name)
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{
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nibl_matched = 1;
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for (nibl_index = 0; nibl_index < z8k_table[tabl_index].length * 2 && nibl_matched; nibl_index++)
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{
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if ((nibl_index % 4) == 0)
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/* Fetch one word at a time. */
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FETCH_DATA (info, nibl_index + 4);
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instr_nibl = nibbles[nibl_index];
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tabl_datum = z8k_table[tabl_index].byte_info[nibl_index];
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datum_class = tabl_datum & CLASS_MASK;
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datum_value = ~CLASS_MASK & tabl_datum;
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switch (datum_class)
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{
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case CLASS_BIT:
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if (datum_value != instr_nibl)
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nibl_matched = 0;
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break;
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case CLASS_00II:
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if (!((~instr_nibl) & 0x4))
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nibl_matched = 0;
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break;
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case CLASS_01II:
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if (!(instr_nibl & 0x4))
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nibl_matched = 0;
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break;
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case CLASS_0CCC:
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if (!((~instr_nibl) & 0x8))
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nibl_matched = 0;
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break;
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case CLASS_1CCC:
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if (!(instr_nibl & 0x8))
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nibl_matched = 0;
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break;
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case CLASS_0DISP7:
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if (!((~instr_nibl) & 0x8))
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nibl_matched = 0;
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nibl_index += 1;
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break;
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case CLASS_1DISP7:
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if (!(instr_nibl & 0x8))
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nibl_matched = 0;
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nibl_index += 1;
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break;
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case CLASS_REGN0:
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if (instr_nibl == 0)
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nibl_matched = 0;
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break;
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case CLASS_BIT_1OR2:
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if ((instr_nibl | 0x2) != (datum_value | 0x2))
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nibl_matched = 0;
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break;
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default:
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break;
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}
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}
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if (nibl_matched)
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{
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return tabl_index;
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}
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tabl_index++;
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}
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return -1;
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}
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static void
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output_instr (instr_data, addr, info)
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instr_data_s *instr_data;
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unsigned long addr;
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disassemble_info *info;
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{
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int loop, loop_limit;
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char tmp_str[20];
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char out_str[100];
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strcpy (out_str, "\t");
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loop_limit = z8k_table[instr_data->tabl_index].length * 2;
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FETCH_DATA (info, loop_limit);
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for (loop = 0; loop < loop_limit; loop++)
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{
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sprintf (tmp_str, "%x", instr_data->nibbles[loop]);
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strcat (out_str, tmp_str);
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}
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while (loop++ < 8)
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{
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strcat (out_str, " ");
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}
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strcat (out_str, instr_data->instr_asmsrc);
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(*info->fprintf_func) (info->stream, "%s", out_str);
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}
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static void
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unpack_instr (instr_data, is_segmented, info)
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instr_data_s *instr_data;
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int is_segmented;
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disassemble_info *info;
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{
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int nibl_count, loop;
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unsigned short instr_nibl, instr_byte, instr_word;
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long instr_long;
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unsigned short tabl_datum, datum_class, datum_value;
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nibl_count = 0;
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loop = 0;
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while (z8k_table[instr_data->tabl_index].byte_info[loop] != 0)
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{
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FETCH_DATA (info, nibl_count + 4 - (nibl_count % 4));
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instr_nibl = instr_data->nibbles[nibl_count];
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instr_byte = instr_data->bytes[nibl_count];
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instr_word = instr_data->words[nibl_count];
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tabl_datum = z8k_table[instr_data->tabl_index].byte_info[loop];
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datum_class = tabl_datum & CLASS_MASK;
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datum_value = tabl_datum & ~CLASS_MASK;
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switch (datum_class)
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{
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case CLASS_X:
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instr_data->address = instr_nibl;
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break;
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case CLASS_BA:
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instr_data->displacement = instr_nibl;
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break;
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case CLASS_BX:
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instr_data->arg_reg[datum_value] = instr_nibl;
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break;
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case CLASS_DISP:
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switch (datum_value)
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{
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case ARG_DISP16:
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instr_data->displacement = instr_word;
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nibl_count += 3;
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break;
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case ARG_DISP12:
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instr_data->displacement = instr_word & 0x0fff;
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nibl_count += 2;
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break;
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default:
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break;
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}
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break;
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case CLASS_IMM:
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switch (datum_value)
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{
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case ARG_IMM4:
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instr_data->immediate = instr_nibl;
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break;
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case ARG_NIM8:
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instr_data->immediate = (-instr_byte);
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nibl_count += 1;
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break;
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case ARG_IMM8:
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instr_data->immediate = instr_byte;
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nibl_count += 1;
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break;
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case ARG_IMM16:
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instr_data->immediate = instr_word;
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nibl_count += 3;
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break;
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case ARG_IMM32:
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FETCH_DATA (info, nibl_count + 8);
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instr_long = (instr_data->words[nibl_count] << 16)
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instr_data->immediate = instr_long;
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nibl_count += 7;
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break;
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case ARG_IMMN:
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|||
|
|
instr_data->immediate = instr_nibl - 1;
|
|||
|
|
break;
|
|||
|
|
case ARG_IMM4M1:
|
|||
|
|
instr_data->immediate = instr_nibl + 1;
|
|||
|
|
break;
|
|||
|
|
case ARG_IMM_1:
|
|||
|
|
instr_data->immediate = 1;
|
|||
|
|
break;
|
|||
|
|
case ARG_IMM_2:
|
|||
|
|
instr_data->immediate = 2;
|
|||
|
|
break;
|
|||
|
|
case ARG_IMM2:
|
|||
|
|
instr_data->immediate = instr_nibl & 0x3;
|
|||
|
|
break;
|
|||
|
|
default:
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
break;
|
|||
|
|
case CLASS_CC:
|
|||
|
|
instr_data->cond_code = instr_nibl;
|
|||
|
|
break;
|
|||
|
|
case CLASS_CTRL:
|
|||
|
|
instr_data->ctrl_code = instr_nibl;
|
|||
|
|
break;
|
|||
|
|
case CLASS_DA:
|
|||
|
|
case CLASS_ADDRESS:
|
|||
|
|
if (is_segmented)
|
|||
|
|
{
|
|||
|
|
if (instr_nibl & 0x8)
|
|||
|
|
{
|
|||
|
|
FETCH_DATA (info, nibl_count + 8);
|
|||
|
|
instr_long = (instr_data->words[nibl_count] << 16)
|
|||
|
|
| (instr_data->words[nibl_count + 4]);
|
|||
|
|
instr_data->address = ((instr_word & 0x7f00) << 8) +
|
|||
|
|
(instr_long & 0xffff);
|
|||
|
|
nibl_count += 7;
|
|||
|
|
}
|
|||
|
|
else
|
|||
|
|
{
|
|||
|
|
instr_data->address = ((instr_word & 0x7f00) << 8) +
|
|||
|
|
(instr_word & 0x00ff);
|
|||
|
|
nibl_count += 3;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
else
|
|||
|
|
{
|
|||
|
|
instr_data->address = instr_word;
|
|||
|
|
nibl_count += 3;
|
|||
|
|
}
|
|||
|
|
break;
|
|||
|
|
case CLASS_0CCC:
|
|||
|
|
instr_data->cond_code = instr_nibl & 0x7;
|
|||
|
|
break;
|
|||
|
|
case CLASS_1CCC:
|
|||
|
|
instr_data->cond_code = instr_nibl & 0x7;
|
|||
|
|
break;
|
|||
|
|
case CLASS_0DISP7:
|
|||
|
|
instr_data->displacement = instr_byte & 0x7f;
|
|||
|
|
nibl_count += 1;
|
|||
|
|
break;
|
|||
|
|
case CLASS_1DISP7:
|
|||
|
|
instr_data->displacement = instr_byte & 0x7f;
|
|||
|
|
nibl_count += 1;
|
|||
|
|
break;
|
|||
|
|
case CLASS_01II:
|
|||
|
|
instr_data->interrupts = instr_nibl & 0x3;
|
|||
|
|
break;
|
|||
|
|
case CLASS_00II:
|
|||
|
|
instr_data->interrupts = instr_nibl & 0x3;
|
|||
|
|
break;
|
|||
|
|
case CLASS_BIT:
|
|||
|
|
/* do nothing */
|
|||
|
|
break;
|
|||
|
|
case CLASS_IR:
|
|||
|
|
instr_data->arg_reg[datum_value] = instr_nibl;
|
|||
|
|
break;
|
|||
|
|
case CLASS_FLAGS:
|
|||
|
|
instr_data->flags = instr_nibl;
|
|||
|
|
break;
|
|||
|
|
case CLASS_REG:
|
|||
|
|
instr_data->arg_reg[datum_value] = instr_nibl;
|
|||
|
|
break;
|
|||
|
|
case CLASS_REG_BYTE:
|
|||
|
|
instr_data->arg_reg[datum_value] = instr_nibl;
|
|||
|
|
break;
|
|||
|
|
case CLASS_REG_WORD:
|
|||
|
|
instr_data->arg_reg[datum_value] = instr_nibl;
|
|||
|
|
break;
|
|||
|
|
case CLASS_REG_QUAD:
|
|||
|
|
instr_data->arg_reg[datum_value] = instr_nibl;
|
|||
|
|
break;
|
|||
|
|
case CLASS_REG_LONG:
|
|||
|
|
instr_data->arg_reg[datum_value] = instr_nibl;
|
|||
|
|
break;
|
|||
|
|
case CLASS_REGN0:
|
|||
|
|
instr_data->arg_reg[datum_value] = instr_nibl;
|
|||
|
|
break;
|
|||
|
|
default:
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
loop += 1;
|
|||
|
|
nibl_count += 1;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
static void
|
|||
|
|
unparse_instr (instr_data)
|
|||
|
|
instr_data_s *instr_data;
|
|||
|
|
{
|
|||
|
|
unsigned short tabl_datum, datum_class, datum_value;
|
|||
|
|
int loop, loop_limit;
|
|||
|
|
char out_str[80], tmp_str[25];
|
|||
|
|
|
|||
|
|
sprintf (out_str, "\t%s\t", z8k_table[instr_data->tabl_index].name);
|
|||
|
|
|
|||
|
|
loop_limit = z8k_table[instr_data->tabl_index].noperands;
|
|||
|
|
for (loop = 0; loop < loop_limit; loop++)
|
|||
|
|
{
|
|||
|
|
if (loop)
|
|||
|
|
strcat (out_str, ",");
|
|||
|
|
|
|||
|
|
tabl_datum = z8k_table[instr_data->tabl_index].arg_info[loop];
|
|||
|
|
datum_class = tabl_datum & CLASS_MASK;
|
|||
|
|
datum_value = tabl_datum & ~CLASS_MASK;
|
|||
|
|
|
|||
|
|
switch (datum_class)
|
|||
|
|
{
|
|||
|
|
case CLASS_X:
|
|||
|
|
sprintf (tmp_str, "0x%0lx(R%ld)", instr_data->address,
|
|||
|
|
instr_data->arg_reg[datum_value]);
|
|||
|
|
strcat (out_str, tmp_str);
|
|||
|
|
break;
|
|||
|
|
case CLASS_BA:
|
|||
|
|
sprintf (tmp_str, "r%ld(#%lx)", instr_data->arg_reg[datum_value],
|
|||
|
|
instr_data->immediate);
|
|||
|
|
strcat (out_str, tmp_str);
|
|||
|
|
break;
|
|||
|
|
case CLASS_BX:
|
|||
|
|
sprintf (tmp_str, "r%ld(R%ld)", instr_data->arg_reg[datum_value],
|
|||
|
|
instr_data->arg_reg[ARG_RX]);
|
|||
|
|
strcat (out_str, tmp_str);
|
|||
|
|
break;
|
|||
|
|
case CLASS_DISP:
|
|||
|
|
sprintf (tmp_str, "#0x%0lx", instr_data->displacement);
|
|||
|
|
strcat (out_str, tmp_str);
|
|||
|
|
break;
|
|||
|
|
case CLASS_IMM:
|
|||
|
|
sprintf (tmp_str, "#0x%0lx", instr_data->immediate);
|
|||
|
|
strcat (out_str, tmp_str);
|
|||
|
|
break;
|
|||
|
|
case CLASS_CC:
|
|||
|
|
sprintf (tmp_str, "%s", codes[instr_data->cond_code]);
|
|||
|
|
strcat (out_str, tmp_str);
|
|||
|
|
break;
|
|||
|
|
case CLASS_CTRL:
|
|||
|
|
sprintf (tmp_str, "0x%0lx", instr_data->ctrl_code);
|
|||
|
|
strcat (out_str, tmp_str);
|
|||
|
|
break;
|
|||
|
|
case CLASS_DA:
|
|||
|
|
case CLASS_ADDRESS:
|
|||
|
|
sprintf (tmp_str, "#0x%0lx", instr_data->address);
|
|||
|
|
strcat (out_str, tmp_str);
|
|||
|
|
break;
|
|||
|
|
case CLASS_IR:
|
|||
|
|
sprintf (tmp_str, "@R%ld", instr_data->arg_reg[datum_value]);
|
|||
|
|
strcat (out_str, tmp_str);
|
|||
|
|
break;
|
|||
|
|
case CLASS_FLAGS:
|
|||
|
|
sprintf (tmp_str, "0x%0lx", instr_data->flags);
|
|||
|
|
strcat (out_str, tmp_str);
|
|||
|
|
break;
|
|||
|
|
case CLASS_REG_BYTE:
|
|||
|
|
if (instr_data->arg_reg[datum_value] >= 0x8)
|
|||
|
|
{
|
|||
|
|
sprintf (tmp_str, "rl%ld",
|
|||
|
|
instr_data->arg_reg[datum_value] - 0x8);
|
|||
|
|
}
|
|||
|
|
else
|
|||
|
|
{
|
|||
|
|
sprintf (tmp_str, "rh%ld", instr_data->arg_reg[datum_value]);
|
|||
|
|
}
|
|||
|
|
strcat (out_str, tmp_str);
|
|||
|
|
break;
|
|||
|
|
case CLASS_REG_WORD:
|
|||
|
|
sprintf (tmp_str, "r%ld", instr_data->arg_reg[datum_value]);
|
|||
|
|
strcat (out_str, tmp_str);
|
|||
|
|
break;
|
|||
|
|
case CLASS_REG_QUAD:
|
|||
|
|
sprintf (tmp_str, "rq%ld", instr_data->arg_reg[datum_value]);
|
|||
|
|
strcat (out_str, tmp_str);
|
|||
|
|
break;
|
|||
|
|
case CLASS_REG_LONG:
|
|||
|
|
sprintf (tmp_str, "rr%ld", instr_data->arg_reg[datum_value]);
|
|||
|
|
strcat (out_str, tmp_str);
|
|||
|
|
break;
|
|||
|
|
default:
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
strcpy (instr_data->instr_asmsrc, out_str);
|
|||
|
|
}
|