binutils-gdb/opcodes/d30v-dis.c

400 lines
9.6 KiB
C

/* Disassemble D30V instructions.
Copyright (C) 1997, 1998 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include <stdio.h>
#include "opcode/d30v.h"
#include "dis-asm.h"
#include "opintl.h"
#define PC_MASK 0xFFFFFFFF
static int lookup_opcode PARAMS (( struct d30v_insn *insn, long num, int is_long ));
static void print_insn PARAMS (( struct disassemble_info *info, bfd_vma memaddr, long long num,
struct d30v_insn *insn, int is_long, int show_ext ));
static int extract_value PARAMS (( long long num, struct d30v_operand *oper, int is_long ));
int
print_insn_d30v (memaddr, info)
bfd_vma memaddr;
struct disassemble_info *info;
{
int status, result;
bfd_byte buffer[12];
unsigned long in1,in2;
struct d30v_insn insn;
long long num;
insn.form = (struct d30v_format *)NULL;
info->bytes_per_line = 8;
info->bytes_per_chunk = 4;
info->display_endian = BFD_ENDIAN_BIG;
status = (*info->read_memory_func) (memaddr, buffer, 4, info);
if (status != 0)
{
(*info->memory_error_func) (status, memaddr, info);
return -1;
}
in1 = bfd_getb32 (buffer);
status = (*info->read_memory_func) (memaddr+4, buffer, 4, info);
if (status != 0)
{
info->bytes_per_line = 8;
if (!(result = lookup_opcode(&insn, in1, 0)))
(*info->fprintf_func) (info->stream, ".long\t0x%x",in1);
else
print_insn(info, memaddr, (long long) in1, &insn, 0, result);
return 4;
}
in2 = bfd_getb32 (buffer);
if (in1 & in2 & FM01)
{
/* LONG instruction */
if (!(result = lookup_opcode(&insn, in1, 1)))
{
(*info->fprintf_func) (info->stream, ".long\t0x%x,0x%x",in1,in2);
return 8;
}
num = (long long)in1 << 32 | in2;
print_insn(info, memaddr, num, &insn, 1, result);
}
else
{
num = in1;
if (!(result = lookup_opcode(&insn, in1, 0)))
(*info->fprintf_func) (info->stream, ".long\t0x%x",in1);
else
print_insn(info, memaddr, num, &insn, 0, result);
switch ( ((in1>>31)<<1) | (in2>>31) )
{
case 0:
(*info->fprintf_func) (info->stream, "\t||\t");
break;
case 1:
(*info->fprintf_func) (info->stream, "\t->\t");
break;
case 2:
(*info->fprintf_func) (info->stream, "\t<-\t");
default:
break;
}
insn.form = (struct d30v_format *)NULL;
num = in2;
if (!(result = lookup_opcode(&insn, in2, 0)))
(*info->fprintf_func) (info->stream, ".long\t0x%x",in2);
else
print_insn(info, memaddr, num, &insn, 0, result);
}
return 8;
}
/* returns 0 if lookup fails */
/* 1 if found and only one form */
/* 2 if found and there are short and long forms */
static int
lookup_opcode (insn, num, is_long)
struct d30v_insn *insn;
long num;
int is_long;
{
int i=0, index;
struct d30v_format *f;
struct d30v_opcode *op = (struct d30v_opcode *)d30v_opcode_table;
int op1 = (num >> 25) & 0x7;
int op2 = (num >> 20) & 0x1f;
int mod = (num >> 18) & 0x3;
/* find the opcode */
do {
if ((op->op1 == op1) && (op->op2 == op2))
break;
op++;
} while (op->name);
if (!op || !op->name)
return 0;
while (op->op1 == op1 && op->op2 == op2)
{
/* scan through all the formats for the opcode */
index = op->format[i++];
do
{
f = (struct d30v_format *)&d30v_format_table[index];
while (f->form == index)
{
if ((!is_long || f->form >= LONG) && (f->modifier == mod))
{
insn->form = f;
break;
}
f++;
}
if (insn->form)
break;
} while ((index = op->format[i++]) != 0);
if (insn->form)
break;
op++;
i=0;
}
if (insn->form == NULL)
return 0;
insn->op = op;
insn->ecc = (num >> 28) & 0x7;
if (op->format[1])
return 2;
else
return 1;
}
static void
print_insn ( info, memaddr, num, insn, is_long, show_ext )
struct disassemble_info *info;
bfd_vma memaddr;
long long num;
struct d30v_insn *insn;
int is_long;
int show_ext;
{
int val, opnum, need_comma=0;
struct d30v_operand *oper;
int i, match, opind=0, need_paren=0, found_control=0;
(*info->fprintf_func) (info->stream, "%s",insn->op->name);
/* check for CMP or CMPU */
if (d30v_operand_table[insn->form->operands[0]].flags & OPERAND_NAME)
{
opind++;
val = extract_value(num,(struct d30v_operand *)&d30v_operand_table[insn->form->operands[0]],is_long);
(*info->fprintf_func) (info->stream, "%s",d30v_cc_names[val]);
}
/* add in ".s" or ".l" */
if (show_ext == 2)
{
if (is_long)
(*info->fprintf_func) (info->stream, ".l");
else
(*info->fprintf_func) (info->stream, ".s");
}
if (insn->ecc)
(*info->fprintf_func) (info->stream, "/%s",d30v_ecc_names[insn->ecc]);
(*info->fprintf_func) (info->stream, "\t");
while ((opnum = insn->form->operands[opind++]) != 0)
{
int bits;
oper = (struct d30v_operand *)&d30v_operand_table[opnum];
bits = oper->bits;
if (oper->flags & OPERAND_SHIFT)
bits += 3;
if (need_comma && oper->flags != OPERAND_PLUS && oper->flags != OPERAND_MINUS)
{
need_comma=0;
(*info->fprintf_func) (info->stream, ", ");
}
if (oper->flags == OPERAND_ATMINUS)
{
(*info->fprintf_func) (info->stream, "@-");
continue;
}
if (oper->flags == OPERAND_MINUS)
{
(*info->fprintf_func) (info->stream, "-");
continue;
}
if (oper->flags == OPERAND_PLUS)
{
(*info->fprintf_func) (info->stream, "+");
continue;
}
if (oper->flags == OPERAND_ATSIGN)
{
(*info->fprintf_func) (info->stream, "@");
continue;
}
if (oper->flags == OPERAND_ATPAR)
{
(*info->fprintf_func) (info->stream, "@(");
need_paren = 1;
continue;
}
if (oper->flags == OPERAND_SPECIAL)
continue;
val = extract_value(num, oper, is_long);
if (oper->flags & OPERAND_REG)
{
match = 0;
if (oper->flags & OPERAND_CONTROL)
{
struct d30v_operand *oper3 =
(struct d30v_operand *)&d30v_operand_table[insn->form->operands[2]];
int id = extract_value (num, oper3, is_long );
found_control = 1;
switch ( id )
{
case 0:
val |= OPERAND_CONTROL;
break;
case 1:
case 2:
val = OPERAND_CONTROL + MAX_CONTROL_REG + id;
break;
case 3:
val |= OPERAND_FLAG;
break;
default:
fprintf(stderr,"illegal id (%d)\n",id);
}
}
else if (oper->flags & OPERAND_ACC)
val |= OPERAND_ACC;
else if (oper->flags & OPERAND_FLAG)
val |= OPERAND_FLAG;
for (i=0;i<reg_name_cnt();i++)
{
if (val == pre_defined_registers[i].value)
{
if (pre_defined_registers[i].pname)
(*info->fprintf_func)
(info->stream, "%s",pre_defined_registers[i].pname);
else
(*info->fprintf_func)
(info->stream, "%s",pre_defined_registers[i].name);
match=1;
break;
}
}
if (match==0)
{
/* this would only get executed if a register was not in the
register table */
(*info->fprintf_func)
(info->stream, _("<unknown register %d>"), val & 0x3F);
}
}
else if (insn->op->reloc_flag == RELOC_PCREL ||
(opind == 1 && (insn->form->form == SHORT_D2 || insn->form->form == LONG_D)))
{
long max;
int neg=0;
max = (1 << (bits - 1));
if (val & max)
{
if (bits == 32)
val = -val;
else
val = -val & ((1 << bits)-1);
neg = 1;
}
if (opind == 1 && (insn->form->form == SHORT_D2 || insn->form->form == LONG_D))
{
(*info->fprintf_func) (info->stream, "%x",val);
}
else {
if (neg)
{
(*info->fprintf_func) (info->stream, "-%x\t(",val);
(*info->print_address_func) ((memaddr - val) & PC_MASK, info);
(*info->fprintf_func) (info->stream, ")");
}
else
{
(*info->fprintf_func) (info->stream, "%x\t(",val);
(*info->print_address_func) ((memaddr + val) & PC_MASK, info);
(*info->fprintf_func) (info->stream, ")");
}
}
}
else if (insn->op->reloc_flag == RELOC_ABS)
{
(*info->print_address_func) (val, info);
}
else
{
if (oper->flags & OPERAND_SIGNED)
{
int max = (1 << (bits - 1));
if (val & max)
{
val = -val;
if (bits < 32)
val &= ((1 << bits) - 1);
(*info->fprintf_func) (info->stream, "-");
}
}
(*info->fprintf_func) (info->stream, "0x%x",val);
}
/* if there is another operand, then write a comma and space */
if (insn->form->operands[opind] && !(found_control && opind == 2))
need_comma = 1;
}
if (need_paren)
(*info->fprintf_func) (info->stream, ")");
}
static int
extract_value (num, oper, is_long)
long long num;
struct d30v_operand *oper;
int is_long;
{
int val;
int shift = 12 - oper->position;
int mask = (0xFFFFFFFF >> (32 - oper->bits));
if (is_long)
{
if (oper->bits == 32)
{
/* piece together 32-bit constant */
val = ((num & 0x3FFFF)
| ((num & 0xFF00000) >> 2)
| ((num & 0x3F00000000LL) >> 6));
}
else
val = (num >> (32 + shift)) & mask;
}
else
val = (num >> shift) & mask;
if (oper->flags & OPERAND_SHIFT)
val <<= 3;
return val;
}