644 lines
16 KiB
C
644 lines
16 KiB
C
/* Disassemble z8000 code.
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Copyright 1992, 1993, 1998, 2000, 2001, 2002, 2003, 2005, 2007
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Free Software Foundation, Inc.
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This file is part of the GNU opcodes library.
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This library 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 3, or (at your option)
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any later version.
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It is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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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 file; see the file COPYING. If not, write to the
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Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, 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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int 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 (struct disassemble_info *info, 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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static char *ctrl_names[8] =
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{
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"<invld>",
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"flags",
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"fcw",
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"refresh",
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"psapseg",
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"psapoff",
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"nspseg",
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"nspoff"
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};
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static int seg_length;
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int z8k_lookup_instr (unsigned char *, disassemble_info *);
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static void output_instr (instr_data_s *, unsigned long, disassemble_info *);
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static void unpack_instr (instr_data_s *, int, disassemble_info *);
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static void unparse_instr (instr_data_s *, int);
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static int
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print_insn_z8k (bfd_vma addr, disassemble_info *info, 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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info->bytes_per_chunk = 2;
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info->bytes_per_line = 6;
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info->display_endian = BFD_ENDIAN_BIG;
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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, is_segmented);
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output_instr (&instr_data, addr, info);
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return z8k_table[instr_data.tabl_index].length + seg_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 (bfd_vma addr, 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 (bfd_vma addr, 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 (unsigned char *nibbles, 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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int need_fetch = 0;
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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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FETCH_DATA (info, 4);
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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;
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nibl_index < z8k_table[tabl_index].length * 2 && nibl_matched;
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nibl_index++)
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{
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if ((nibl_index % 4) == 0)
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{
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/* Fetch data only if it isn't already there. */
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if (nibl_index >= 4 || (nibl_index < 4 && need_fetch))
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FETCH_DATA (info, nibl_index + 4); /* Fetch one word at a time. */
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if (nibl_index < 4)
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need_fetch = 0;
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else
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need_fetch = 1;
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}
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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_IGNORE:
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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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return tabl_index;
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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_s *instr_data,
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unsigned long addr ATTRIBUTE_UNUSED,
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disassemble_info *info)
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{
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int num_bytes;
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char out_str[100];
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out_str[0] = 0;
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num_bytes = (z8k_table[instr_data->tabl_index].length + seg_length) * 2;
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FETCH_DATA (info, num_bytes);
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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_s *instr_data, int is_segmented, 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 int tabl_datum, datum_class;
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unsigned short datum_value;
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nibl_count = 0;
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loop = 0;
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seg_length = 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 & ~1];
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instr_word = instr_data->words[nibl_count & ~3];
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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_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_data->insn_start + 4
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+ (signed short) (instr_word & 0xffff);
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nibl_count += 3;
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break;
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case ARG_DISP12:
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if (instr_word & 0x800)
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/* Negative 12 bit displacement. */
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instr_data->displacement = instr_data->insn_start + 2
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- (signed short) ((instr_word & 0xfff) | 0xf000) * 2;
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else
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instr_data->displacement = instr_data->insn_start + 2
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- (instr_word & 0x0fff) * 2;
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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_NIM4:
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instr_data->immediate = (- instr_nibl) & 0xf;
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break;
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case ARG_NIM8:
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instr_data->immediate = (- instr_byte) & 0xff;
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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->words[nibl_count + 4]);
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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;
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break;
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case ARG_IMM4M1:
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instr_data->immediate = instr_nibl + 1;
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break;
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case ARG_IMM_1:
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instr_data->immediate = 1;
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break;
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case ARG_IMM_2:
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instr_data->immediate = 2;
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break;
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case ARG_IMM2:
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instr_data->immediate = instr_nibl & 0x3;
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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_CC:
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instr_data->cond_code = instr_nibl;
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break;
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case CLASS_ADDRESS:
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if (is_segmented)
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{
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if (instr_nibl & 0x8)
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{
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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->words[nibl_count + 4]);
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instr_data->address = ((instr_word & 0x7f00) << 16)
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+ (instr_long & 0xffff);
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nibl_count += 7;
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seg_length = 2;
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}
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else
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{
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instr_data->address = ((instr_word & 0x7f00) << 16)
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+ (instr_word & 0x00ff);
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nibl_count += 3;
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}
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}
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else
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{
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instr_data->address = instr_word;
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nibl_count += 3;
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}
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break;
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case CLASS_0CCC:
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case CLASS_1CCC:
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instr_data->ctrl_code = instr_nibl & 0x7;
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break;
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case CLASS_0DISP7:
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instr_data->displacement =
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instr_data->insn_start + 2 - (instr_byte & 0x7f) * 2;
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nibl_count += 1;
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break;
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case CLASS_1DISP7:
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instr_data->displacement =
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instr_data->insn_start + 2 - (instr_byte & 0x7f) * 2;
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nibl_count += 1;
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break;
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case CLASS_01II:
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instr_data->interrupts = instr_nibl & 0x3;
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break;
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case CLASS_00II:
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instr_data->interrupts = instr_nibl & 0x3;
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break;
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case CLASS_IGNORE:
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case CLASS_BIT:
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instr_data->ctrl_code = instr_nibl & 0x7;
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break;
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case CLASS_FLAGS:
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instr_data->flags = instr_nibl;
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break;
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case CLASS_REG:
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instr_data->arg_reg[datum_value] = instr_nibl;
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break;
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case CLASS_REGN0:
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instr_data->arg_reg[datum_value] = instr_nibl;
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break;
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case CLASS_DISP8:
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instr_data->displacement =
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instr_data->insn_start + 2 + (signed char) instr_byte * 2;
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nibl_count += 1;
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break;
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case CLASS_BIT_1OR2:
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instr_data->immediate = ((instr_nibl >> 1) & 0x1) + 1;
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nibl_count += 1;
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break;
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default:
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abort ();
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break;
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}
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loop += 1;
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nibl_count += 1;
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}
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}
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static void
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print_intr(char *tmp_str, unsigned long interrupts)
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{
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int comma = 0;
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*tmp_str = 0;
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if (! (interrupts & 2))
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{
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strcat (tmp_str, "vi");
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comma = 1;
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}
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if (! (interrupts & 1))
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{
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if (comma) strcat (tmp_str, ",");
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strcat (tmp_str, "nvi");
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}
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}
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static void
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print_flags(char *tmp_str, unsigned long flags)
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{
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int comma = 0;
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*tmp_str = 0;
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if (flags & 8)
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{
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strcat (tmp_str, "c");
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comma = 1;
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}
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if (flags & 4)
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{
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if (comma) strcat (tmp_str, ",");
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strcat (tmp_str, "z");
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comma = 1;
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}
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if (flags & 2)
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{
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if (comma) strcat (tmp_str, ",");
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strcat (tmp_str, "s");
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comma = 1;
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}
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if (flags & 1)
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{
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if (comma) strcat (tmp_str, ",");
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strcat (tmp_str, "p");
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}
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}
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static void
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unparse_instr (instr_data_s *instr_data, int is_segmented)
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{
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unsigned short datum_value;
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unsigned int tabl_datum, datum_class;
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int loop, loop_limit;
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char out_str[80], tmp_str[25];
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sprintf (out_str, "%s\t", z8k_table[instr_data->tabl_index].name);
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loop_limit = z8k_table[instr_data->tabl_index].noperands;
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for (loop = 0; loop < loop_limit; loop++)
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{
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if (loop)
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strcat (out_str, ",");
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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:
|
|
if (is_segmented)
|
|
sprintf (tmp_str, "rr%ld(#0x%lx)", instr_data->arg_reg[datum_value],
|
|
instr_data->immediate);
|
|
else
|
|
sprintf (tmp_str, "r%ld(#0x%lx)", instr_data->arg_reg[datum_value],
|
|
instr_data->immediate);
|
|
strcat (out_str, tmp_str);
|
|
break;
|
|
case CLASS_BX:
|
|
if (is_segmented)
|
|
sprintf (tmp_str, "rr%ld(r%ld)", instr_data->arg_reg[datum_value],
|
|
instr_data->arg_reg[ARG_RX]);
|
|
else
|
|
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:
|
|
if (datum_value == ARG_IMM2) /* True with EI/DI instructions only. */
|
|
{
|
|
print_intr (tmp_str, instr_data->interrupts);
|
|
strcat (out_str, tmp_str);
|
|
break;
|
|
}
|
|
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, "%s", ctrl_names[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:
|
|
if (is_segmented)
|
|
sprintf (tmp_str, "@rr%ld", instr_data->arg_reg[datum_value]);
|
|
else
|
|
sprintf (tmp_str, "@r%ld", instr_data->arg_reg[datum_value]);
|
|
strcat (out_str, tmp_str);
|
|
break;
|
|
case CLASS_IRO:
|
|
sprintf (tmp_str, "@r%ld", instr_data->arg_reg[datum_value]);
|
|
strcat (out_str, tmp_str);
|
|
break;
|
|
case CLASS_FLAGS:
|
|
print_flags(tmp_str, 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;
|
|
case CLASS_PR:
|
|
if (is_segmented)
|
|
sprintf (tmp_str, "rr%ld", instr_data->arg_reg[datum_value]);
|
|
else
|
|
sprintf (tmp_str, "r%ld", instr_data->arg_reg[datum_value]);
|
|
strcat (out_str, tmp_str);
|
|
break;
|
|
default:
|
|
abort ();
|
|
break;
|
|
}
|
|
}
|
|
|
|
strcpy (instr_data->instr_asmsrc, out_str);
|
|
}
|