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binutils-gdb/opcodes/d10v-dis.c

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/* Disassemble D10V instructions.
Copyright 1996, 1997, 1998, 2000, 2001 Free Software Foundation, Inc.
This program 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 2 of the License, or
(at your option) any later version.
This program 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 <stdio.h>
#include "sysdep.h"
#include "opcode/d10v.h"
#include "dis-asm.h"
/* The PC wraps at 18 bits, except for the segment number,
so use this mask to keep the parts we want. */
#define PC_MASK 0x0303FFFF
static void dis_2_short PARAMS ((unsigned long insn, bfd_vma memaddr,
struct disassemble_info *info, int order));
static void dis_long PARAMS ((unsigned long insn, bfd_vma memaddr,
struct disassemble_info *info));
static void print_operand
PARAMS ((struct d10v_operand *, long unsigned int, struct d10v_opcode *,
bfd_vma, struct disassemble_info *));
int
print_insn_d10v (memaddr, info)
bfd_vma memaddr;
struct disassemble_info *info;
{
int status;
bfd_byte buffer[4];
unsigned long insn;
status = (*info->read_memory_func) (memaddr, buffer, 4, info);
if (status != 0)
{
(*info->memory_error_func) (status, memaddr, info);
return -1;
}
insn = bfd_getb32 (buffer);
status = insn & FM11;
switch (status)
{
case 0:
dis_2_short (insn, memaddr, info, 2);
break;
case FM01:
dis_2_short (insn, memaddr, info, 0);
break;
case FM10:
dis_2_short (insn, memaddr, info, 1);
break;
case FM11:
dis_long (insn, memaddr, info);
break;
}
return 4;
}
static void
print_operand (oper, insn, op, memaddr, info)
struct d10v_operand *oper;
unsigned long insn;
struct d10v_opcode *op;
bfd_vma memaddr;
struct disassemble_info *info;
{
int num, shift;
if (oper->flags == OPERAND_ATMINUS)
{
(*info->fprintf_func) (info->stream, "@-");
return;
}
if (oper->flags == OPERAND_MINUS)
{
(*info->fprintf_func) (info->stream, "-");
return;
}
if (oper->flags == OPERAND_PLUS)
{
(*info->fprintf_func) (info->stream, "+");
return;
}
if (oper->flags == OPERAND_ATSIGN)
{
(*info->fprintf_func) (info->stream, "@");
return;
}
if (oper->flags == OPERAND_ATPAR)
{
(*info->fprintf_func) (info->stream, "@(");
return;
}
shift = oper->shift;
/* The LONG_L format shifts registers over by 15. */
if (op->format == LONG_L && (oper->flags & OPERAND_REG))
shift += 15;
num = (insn >> shift) & (0x7FFFFFFF >> (31 - oper->bits));
if (oper->flags & OPERAND_REG)
{
int i;
int match = 0;
num += (oper->flags
& (OPERAND_GPR | OPERAND_FFLAG | OPERAND_CFLAG | OPERAND_CONTROL));
if (oper->flags & (OPERAND_ACC0 | OPERAND_ACC1))
num += num ? OPERAND_ACC1 : OPERAND_ACC0;
for (i = 0; i < d10v_reg_name_cnt (); i++)
{
if (num == (d10v_predefined_registers[i].value & ~ OPERAND_SP))
{
if (d10v_predefined_registers[i].pname)
(*info->fprintf_func) (info->stream, "%s",
d10v_predefined_registers[i].pname);
else
(*info->fprintf_func) (info->stream, "%s",
d10v_predefined_registers[i].name);
match = 1;
break;
}
}
if (match == 0)
{
/* This would only get executed if a register was not in the
register table. */
if (oper->flags & (OPERAND_ACC0 | OPERAND_ACC1))
(*info->fprintf_func) (info->stream, "a");
else if (oper->flags & OPERAND_CONTROL)
(*info->fprintf_func) (info->stream, "cr");
else if (oper->flags & OPERAND_REG)
(*info->fprintf_func) (info->stream, "r");
(*info->fprintf_func) (info->stream, "%d", num & REGISTER_MASK);
}
}
else
{
/* Addresses are right-shifted by 2. */
if (oper->flags & OPERAND_ADDR)
{
long max;
int neg = 0;
max = (1 << (oper->bits - 1));
if (num & max)
{
num = -num & ((1 << oper->bits) - 1);
neg = 1;
}
num = num << 2;
if (info->flags & INSN_HAS_RELOC)
(*info->print_address_func) (num & PC_MASK, info);
else
{
if (neg)
(*info->print_address_func) ((memaddr - num) & PC_MASK, info);
else
(*info->print_address_func) ((memaddr + num) & PC_MASK, info);
}
}
else
{
if (oper->flags & OPERAND_SIGNED)
{
int max = (1 << (oper->bits - 1));
if (num & max)
{
num = -num & ((1 << oper->bits) - 1);
(*info->fprintf_func) (info->stream, "-");
}
}
(*info->fprintf_func) (info->stream, "0x%x", num);
}
}
}
static void
dis_long (insn, memaddr, info)
unsigned long insn;
bfd_vma memaddr;
struct disassemble_info *info;
{
int i;
struct d10v_opcode *op = (struct d10v_opcode *) d10v_opcodes;
struct d10v_operand *oper;
int need_paren = 0;
int match = 0;
while (op->name)
{
if ((op->format & LONG_OPCODE) && ((op->mask & insn) == (unsigned long) op->opcode))
{
match = 1;
(*info->fprintf_func) (info->stream, "%s\t", op->name);
for (i = 0; op->operands[i]; i++)
{
oper = (struct d10v_operand *) &d10v_operands[op->operands[i]];
if (oper->flags == OPERAND_ATPAR)
need_paren = 1;
print_operand (oper, insn, op, memaddr, info);
if (op->operands[i + 1] && oper->bits
&& d10v_operands[op->operands[i + 1]].flags != OPERAND_PLUS
&& d10v_operands[op->operands[i + 1]].flags != OPERAND_MINUS)
(*info->fprintf_func) (info->stream, ", ");
}
break;
}
op++;
}
if (!match)
(*info->fprintf_func) (info->stream, ".long\t0x%08x", insn);
if (need_paren)
(*info->fprintf_func) (info->stream, ")");
}
static void
dis_2_short (insn, memaddr, info, order)
unsigned long insn;
bfd_vma memaddr;
struct disassemble_info *info;
int order;
{
int i, j;
unsigned int ins[2];
struct d10v_opcode *op;
int match, num_match = 0;
struct d10v_operand *oper;
int need_paren = 0;
ins[0] = (insn & 0x3FFFFFFF) >> 15;
ins[1] = insn & 0x00007FFF;
for (j = 0; j < 2; j++)
{
op = (struct d10v_opcode *) d10v_opcodes;
match = 0;
while (op->name)
{
if ((op->format & SHORT_OPCODE)
&& ((((unsigned int) op->mask) & ins[j])
== (unsigned int) op->opcode))
{
(*info->fprintf_func) (info->stream, "%s\t", op->name);
for (i = 0; op->operands[i]; i++)
{
oper = (struct d10v_operand *) &d10v_operands[op->operands[i]];
if (oper->flags == OPERAND_ATPAR)
need_paren = 1;
print_operand (oper, ins[j], op, memaddr, info);
if (op->operands[i + 1] && oper->bits
&& d10v_operands[op->operands[i + 1]].flags != OPERAND_PLUS
&& d10v_operands[op->operands[i + 1]].flags != OPERAND_MINUS)
(*info->fprintf_func) (info->stream, ", ");
}
match = 1;
num_match++;
break;
}
op++;
}
if (!match)
(*info->fprintf_func) (info->stream, "unknown");
switch (order)
{
case 0:
(*info->fprintf_func) (info->stream, "\t->\t");
order = -1;
break;
case 1:
(*info->fprintf_func) (info->stream, "\t<-\t");
order = -1;
break;
case 2:
(*info->fprintf_func) (info->stream, "\t||\t");
order = -1;
break;
default:
break;
}
}
if (num_match == 0)
(*info->fprintf_func) (info->stream, ".long\t0x%08x", insn);
if (need_paren)
(*info->fprintf_func) (info->stream, ")");
}
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