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/* pj-dis.c -- Disassemble picoJava instructions.
Copyright (C) 1999-2020 Free Software Foundation, Inc.
Contributed by Steve Chamberlain, of Transmeta (sac@pobox.com).
This file is part of the GNU opcodes library.
This library is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
It is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
#include "sysdep.h"
#include <stdio.h>
#include "opcode/pj.h"
#include "disassemble.h"
extern const pj_opc_info_t pj_opc_info[512];
static int
get_int (bfd_vma memaddr, int *iptr, struct disassemble_info *info)
{
unsigned char ival[4];
int status = info->read_memory_func (memaddr, ival, 4, info);
*iptr = (((unsigned) ival[0] << 24)
| (ival[1] << 16)
| (ival[2] << 8)
| (ival[3] << 0));
return status;
}
int
print_insn_pj (bfd_vma addr, struct disassemble_info *info)
{
fprintf_ftype fprintf_fn = info->fprintf_func;
void *stream = info->stream;
unsigned char opcode;
int status;
if ((status = info->read_memory_func (addr, &opcode, 1, info)))
goto fail;
if (opcode == 0xff)
{
unsigned char byte_2;
if ((status = info->read_memory_func (addr + 1, &byte_2, 1, info)))
goto fail;
fprintf_fn (stream, "%s\t", pj_opc_info[opcode + byte_2].u.name);
return 2;
}
else
{
char *sep = "\t";
int insn_start = addr;
const pj_opc_info_t *op = &pj_opc_info[opcode];
int a;
addr++;
fprintf_fn (stream, "%s", op->u.name);
/* The tableswitch instruction is followed by the default
address, low value, high value and the destinations. */
if (strcmp (op->u.name, "tableswitch") == 0)
{
int lowval;
int highval;
int val;
addr = (addr + 3) & ~3;
if ((status = get_int (addr, &val, info)))
goto fail;
fprintf_fn (stream, " default: ");
(*info->print_address_func) (val + insn_start, info);
addr += 4;
if ((status = get_int (addr, &lowval, info)))
goto fail;
addr += 4;
if ((status = get_int (addr, &highval, info)))
goto fail;
addr += 4;
while (lowval <= highval)
{
if ((status = get_int (addr, &val, info)))
goto fail;
fprintf_fn (stream, " %d:[", lowval);
(*info->print_address_func) (val + insn_start, info);
fprintf_fn (stream, " ]");
addr += 4;
lowval++;
}
return addr - insn_start;
}
/* The lookupswitch instruction is followed by the default
address, element count and pairs of values and
addresses. */
if (strcmp (op->u.name, "lookupswitch") == 0)
{
int count;
int val;
addr = (addr + 3) & ~3;
if ((status = get_int (addr, &val, info)))
goto fail;
addr += 4;
fprintf_fn (stream, " default: ");
(*info->print_address_func) (val + insn_start, info);
if ((status = get_int (addr, &count, info)))
goto fail;
addr += 4;
while (count--)
{
if ((status = get_int (addr, &val, info)))
goto fail;
addr += 4;
fprintf_fn (stream, " %d:[", val);
if ((status = get_int (addr, &val, info)))
goto fail;
addr += 4;
(*info->print_address_func) (val + insn_start, info);
fprintf_fn (stream, " ]");
}
return addr - insn_start;
}
for (a = 0; op->arg[a]; a++)
{
unsigned char data[4];
int val = 0;
int i;
int size = ASIZE (op->arg[a]);
if ((status = info->read_memory_func (addr, data, size, info)))
goto fail;
val = (UNS (op->arg[0]) || ((data[0] & 0x80) == 0)) ? 0 : -1;
for (i = 0; i < size; i++)
val = (val << 8) | (data[i] & 0xff);
if (PCREL (op->arg[a]))
(*info->print_address_func) (val + insn_start, info);
else
fprintf_fn (stream, "%s%d", sep, val);
sep = ",";
addr += size;
}
return op->len;
}
fail:
info->memory_error_func (status, addr, info);
return -1;
}
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