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331 lines
7.4 KiB
C
331 lines
7.4 KiB
C
/* Disassemble h8500 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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#include <stdio.h>
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#define DISASSEMBLER_TABLE
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#define DEFINE_TABLE
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#include "h8500-opc.h"
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#include "dis-asm.h"
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/* Maximum length of an instruction. */
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#define MAXLEN 8
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#include <setjmp.h>
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struct private
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{
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/* Points to first byte not fetched. */
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bfd_byte *max_fetched;
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bfd_byte the_buffer[MAXLEN];
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bfd_vma insn_start;
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jmp_buf bailout;
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};
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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, addr) \
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((addr) <= ((struct private *)(info->private_data))->max_fetched \
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? 1 : fetch_data ((info), (addr)))
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static int
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fetch_data (info, addr)
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struct disassemble_info *info;
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bfd_byte *addr;
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{
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int status;
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struct private *priv = (struct private *)info->private_data;
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bfd_vma start = priv->insn_start + (priv->max_fetched - priv->the_buffer);
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status = (*info->read_memory_func) (start,
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priv->max_fetched,
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addr - priv->max_fetched,
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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, start, info);
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longjmp (priv->bailout);
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}
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else
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priv->max_fetched = addr;
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return 1;
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}
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static char *crname[] =
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{"sr", "ccr", "*", "br", "ep", "dp", "*", "tp"};
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int
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print_insn_h8500 (addr, info)
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unsigned long addr;
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disassemble_info *info;
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{
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h8500_opcode_info *opcode;
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void *stream = info->stream;
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fprintf_ftype func = info->fprintf_func;
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struct private priv;
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bfd_byte *buffer = priv.the_buffer;
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info->private_data = (PTR) &priv;
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priv.max_fetched = priv.the_buffer;
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priv.insn_start = addr;
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if (setjmp (priv.bailout) != 0)
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/* Error return. */
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return -1;
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/* Run down the table to find the one which matches */
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for (opcode = h8500_table; opcode->name; opcode++)
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{
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int byte;
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int rn;
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int rd;
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int rs;
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int disp;
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int abs;
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int imm;
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int pcrel;
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int qim;
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int i;
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int cr;
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for (byte = 0; byte < opcode->length; byte++)
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{
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FETCH_DATA (info, buffer + byte + 1);
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if ((buffer[byte] & opcode->bytes[byte].mask)
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!= (opcode->bytes[byte].contents))
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{
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goto next;
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}
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else
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{
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/* extract any info parts */
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switch (opcode->bytes[byte].insert)
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{
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case 0:
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case FP:
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break;
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default:
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func (stream, "can't cope with insert %d\n",
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opcode->bytes[byte].insert);
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break;
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case RN:
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rn = buffer[byte] & 0x7;
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break;
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case RS:
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rs = buffer[byte] & 0x7;
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break;
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case CRB:
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cr = buffer[byte] & 0x7;
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if (cr == 0)
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goto next;
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break;
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case CRW:
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cr = buffer[byte] & 0x7;
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if (cr != 0)
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goto next;
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break;
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case DISP16:
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FETCH_DATA (info, buffer + byte + 2);
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disp = (buffer[byte] << 8) | (buffer[byte + 1]);
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break;
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case FPIND_D8:
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case DISP8:
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disp = ((char) (buffer[byte]));
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break;
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case RD:
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case RDIND:
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rd = buffer[byte] & 0x7;
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break;
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case ABS24:
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FETCH_DATA (info, buffer + byte + 3);
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abs =
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(buffer[byte] << 16)
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| (buffer[byte + 1] << 8)
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| (buffer[byte + 2]);
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break;
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case ABS16:
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FETCH_DATA (info, buffer + byte + 2);
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abs = (buffer[byte] << 8) | (buffer[byte + 1]);
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break;
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case ABS8:
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abs = (buffer[byte]);
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break;
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case IMM16:
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FETCH_DATA (info, buffer + byte + 2);
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imm = (buffer[byte] << 8) | (buffer[byte + 1]);
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break;
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case IMM4:
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imm = (buffer[byte]) & 0xf;
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break;
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case IMM8:
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case RLIST:
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imm = (buffer[byte]);
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break;
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case PCREL16:
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FETCH_DATA (info, buffer + byte + 2);
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pcrel = (buffer[byte] << 8) | (buffer[byte + 1]);
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break;
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case PCREL8:
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pcrel = (buffer[byte]);
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break;
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case QIM:
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switch (buffer[byte] & 0x7)
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{
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case 0:
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qim = 1;
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break;
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case 1:
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qim = 2;
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break;
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case 4:
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qim = -1;
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break;
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case 5:
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qim = -2;
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break;
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}
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break;
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}
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}
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}
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/* We get here when all the masks have passed so we can output the
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operands*/
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FETCH_DATA (info, buffer + opcode->length);
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for (i = 0; i < opcode->length; i++)
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{
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(func) (stream, "%02x ", buffer[i]);
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}
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for (; i < 6; i++)
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{
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(func) (stream, " ");
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}
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(func) (stream, "%s\t", opcode->name);
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for (i = 0; i < opcode->nargs; i++)
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{
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if (i)
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(func) (stream, ",");
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switch (opcode->arg_type[i])
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{
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case FP:
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func (stream, "fp");
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break;
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case RNIND_D16:
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func (stream, "@(0x%x:16,r%d)", disp, rn);
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break;
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case RNIND_D8:
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func (stream, "@(0x%x:8 (%d),r%d)", disp & 0xff, disp, rn);
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break;
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case RDIND_D16:
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func (stream, "@(0x%x:16,r%d)", disp, rd);
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break;
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case RDIND_D8:
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func (stream, "@(0x%x:8 (%d), r%d)", disp & 0xff, disp, rd);
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break;
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case FPIND_D8:
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func (stream, "@(0x%x:8 (%d), fp)", disp & 0xff, disp, rn);
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break;
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case CRB:
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case CRW:
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func (stream, "%s", crname[cr]);
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break;
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case RN:
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func (stream, "r%d", rn);
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break;
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case RD:
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func (stream, "r%d", rd);
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break;
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case RS:
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func (stream, "r%d", rs);
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break;
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case RNDEC:
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func (stream, "@-r%d", rn);
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break;
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case RNINC:
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func (stream, "@r%d+", rn);
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break;
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case RNIND:
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func (stream, "@r%d", rn);
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break;
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case RDIND:
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func (stream, "@r%d", rd);
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break;
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case SPINC:
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func (stream, "@sp+");
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break;
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case SPDEC:
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func (stream, "@-sp");
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break;
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case ABS24:
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func (stream, "@0x%0x:24", abs);
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break;
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case ABS16:
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func (stream, "@0x%0x:16", abs & 0xffff);
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break;
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case ABS8:
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func (stream, "@0x%0x:8", abs & 0xff);
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break;
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case IMM16:
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func (stream, "#0x%0x:16", imm & 0xffff);
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break;
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case RLIST:
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{
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int i;
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int nc = 0;
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func (stream, "(");
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for (i = 0; i < 8; i++)
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{
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if (imm & (1 << i))
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{
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if (nc)
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func (stream, ",");
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nc += 1;
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}
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func (stream, "r%d", i);
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}
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func (stream, ")");
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}
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break;
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case IMM8:
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func (stream, "#0x%0x:8", imm & 0xff);
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break;
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case PCREL16:
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func (stream, "0x%0x:16", (pcrel + addr + opcode->length) & 0xffff);
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break;
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case PCREL8:
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func (stream, "#0x%0x:8",
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((char) pcrel + addr + opcode->length) & 0xffff);
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break;
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case QIM:
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func (stream, "#%d:q", qim);
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break;
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case IMM4:
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func (stream, "#%d:4", imm);
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break;
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}
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}
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return opcode->length;
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next:;
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}
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/* Couldn't understand anything */
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func (stream, "%02x\t\t*unknown*", buffer[0]);
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return 1;
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}
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