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binutils-gdb/opcodes/or32-dis.c

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/* Instruction printing code for the OpenRISC 1000
Copyright (C) 2002 Free Software Foundation, Inc.
Contributed by Damjan Lampret <lampret@opencores.org>.
Modified from a29k port.
This file is part of Binutils.
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. */
#define DEBUG 0
#include "dis-asm.h"
#include "opcode/or32.h"
#include "safe-ctype.h"
#include <string.h>
#include <stdlib.h>
#define EXTEND29(x) ((x) & (unsigned long) 0x10000000 ? ((x) | (unsigned long) 0xf0000000) : ((x)))
static void find_bytes_big PARAMS ((unsigned char *, unsigned long *));
static void find_bytes_little PARAMS ((unsigned char *, unsigned long *));
static unsigned long or32_extract PARAMS ((char, char *, unsigned long));
static int or32_opcode_match PARAMS ((unsigned long, char *));
static void or32_print_register PARAMS ((char, char *, unsigned long, struct disassemble_info *));
static void or32_print_immediate PARAMS ((char, char *, unsigned long, struct disassemble_info *));
static int print_insn PARAMS ((bfd_vma, struct disassemble_info *));
/* Now find the four bytes of INSN_CH and put them in *INSN. */
static void
find_bytes_big (insn_ch, insn)
unsigned char *insn_ch;
unsigned long *insn;
{
*insn =
((unsigned long) insn_ch[0] << 24) +
((unsigned long) insn_ch[1] << 16) +
((unsigned long) insn_ch[2] << 8) +
((unsigned long) insn_ch[3]);
#if DEBUG
printf ("find_bytes_big3: %x\n", *insn);
#endif
}
static void
find_bytes_little (insn_ch, insn)
unsigned char *insn_ch;
unsigned long *insn;
{
*insn =
((unsigned long) insn_ch[3] << 24) +
((unsigned long) insn_ch[2] << 16) +
((unsigned long) insn_ch[1] << 8) +
((unsigned long) insn_ch[0]);
}
typedef void (*find_byte_func_type)
PARAMS ((unsigned char *, unsigned long *));
static unsigned long
or32_extract (param_ch, enc_initial, insn)
char param_ch;
char *enc_initial;
unsigned long insn;
{
char *enc;
unsigned long ret = 0;
int opc_pos = 0;
int param_pos = 0;
for (enc = enc_initial; *enc != '\0'; enc++)
if (*enc == param_ch)
{
if (enc - 2 >= enc_initial && (*(enc - 2) == '0') && (*(enc - 1) == 'x'))
continue;
else
param_pos++;
}
#if DEBUG
printf ("or32_extract: %c %x ", param_ch, param_pos);
#endif
opc_pos = 32;
for (enc = enc_initial; *enc != '\0'; )
if ((*enc == '0') && (*(enc + 1) == 'x'))
{
opc_pos -= 4;
if ((param_ch == '0') || (param_ch == '1'))
{
unsigned long tmp = strtoul (enc, NULL, 16);
#if DEBUG
printf (" enc=%s, tmp=%x ", enc, tmp);
#endif
if (param_ch == '0')
tmp = 15 - tmp;
ret |= tmp << opc_pos;
}
enc += 3;
}
else if ((*enc == '0') || (*enc == '1'))
{
opc_pos--;
if (param_ch == *enc)
ret |= 1 << opc_pos;
enc++;
}
else if (*enc == param_ch)
{
opc_pos--;
param_pos--;
#if DEBUG
printf ("\n ret=%x opc_pos=%x, param_pos=%x\n", ret, opc_pos, param_pos);
#endif
ret += ((insn >> opc_pos) & 0x1) << param_pos;
if (!param_pos
&& letter_signed (param_ch)
&& ret >> (letter_range (param_ch) - 1))
{
#if DEBUG
printf ("\n ret=%x opc_pos=%x, param_pos=%x\n",
ret, opc_pos, param_pos);
#endif
ret |= 0xffffffff << letter_range(param_ch);
#if DEBUG
printf ("\n after conversion to signed: ret=%x\n", ret);
#endif
}
enc++;
}
else if (ISALPHA (*enc))
{
opc_pos--;
enc++;
}
else if (*enc == '-')
{
opc_pos--;
enc++;
}
else
enc++;
#if DEBUG
printf ("ret=%x\n", ret);
#endif
return ret;
}
static int
or32_opcode_match (insn, encoding)
unsigned long insn;
char *encoding;
{
unsigned long ones, zeros;
#if DEBUG
printf ("or32_opcode_match: %.8lx\n", insn);
#endif
ones = or32_extract ('1', encoding, insn);
zeros = or32_extract ('0', encoding, insn);
#if DEBUG
printf ("ones: %x \n", ones);
printf ("zeros: %x \n", zeros);
#endif
if ((insn & ones) != ones)
{
#if DEBUG
printf ("ret1\n");
#endif
return 0;
}
if ((~insn & zeros) != zeros)
{
#if DEBUG
printf ("ret2\n");
#endif
return 0;
}
#if DEBUG
printf ("ret3\n");
#endif
return 1;
}
/* Print register to INFO->STREAM. Used only by print_insn. */
static void
or32_print_register (param_ch, encoding, insn, info)
char param_ch;
char *encoding;
unsigned long insn;
struct disassemble_info *info;
{
int regnum = or32_extract (param_ch, encoding, insn);
#if DEBUG
printf ("or32_print_register: %c, %s, %x\n", param_ch, encoding, insn);
#endif
if (param_ch == 'A')
(*info->fprintf_func) (info->stream, "r%d", regnum);
else if (param_ch == 'B')
(*info->fprintf_func) (info->stream, "r%d", regnum);
else if (param_ch == 'D')
(*info->fprintf_func) (info->stream, "r%d", regnum);
else if (regnum < 16)
(*info->fprintf_func) (info->stream, "r%d", regnum);
else if (regnum < 32)
(*info->fprintf_func) (info->stream, "r%d", regnum-16);
else
(*info->fprintf_func) (info->stream, "X%d", regnum);
}
/* Print immediate to INFO->STREAM. Used only by print_insn. */
static void
or32_print_immediate (param_ch, encoding, insn, info)
char param_ch;
char *encoding;
unsigned long insn;
struct disassemble_info *info;
{
int imm = or32_extract(param_ch, encoding, insn);
if (letter_signed(param_ch))
(*info->fprintf_func) (info->stream, "0x%x", imm);
/* (*info->fprintf_func) (info->stream, "%d", imm); */
else
(*info->fprintf_func) (info->stream, "0x%x", imm);
}
/* Print one instruction from MEMADDR on INFO->STREAM.
Return the size of the instruction (always 4 on or32). */
static int
print_insn (memaddr, info)
bfd_vma memaddr;
struct disassemble_info *info;
{
/* The raw instruction. */
unsigned char insn_ch[4];
/* Address. Will be sign extened 27-bit. */
unsigned long addr;
/* The four bytes of the instruction. */
unsigned long insn;
find_byte_func_type find_byte_func = (find_byte_func_type)info->private_data;
struct or32_opcode CONST * opcode;
{
int status =
(*info->read_memory_func) (memaddr, (bfd_byte *) &insn_ch[0], 4, info);
if (status != 0)
{
(*info->memory_error_func) (status, memaddr, info);
return -1;
}
}
(*find_byte_func) (&insn_ch[0], &insn);
for (opcode = &or32_opcodes[0];
opcode < &or32_opcodes[or32_num_opcodes];
++opcode)
{
if (or32_opcode_match (insn, opcode->encoding))
{
char *s;
(*info->fprintf_func) (info->stream, "%s ", opcode->name);
for (s = opcode->args; *s != '\0'; ++s)
{
switch (*s)
{
case '\0':
return 4;
case 'r':
or32_print_register (*++s, opcode->encoding, insn, info);
break;
case 'X':
addr = or32_extract ('X', opcode->encoding, insn) << 2;
/* Calulate the correct address. XXX is this really correct ?? */
addr = memaddr + EXTEND29 (addr);
(*info->print_address_func)
(addr, info);
break;
default:
if (strchr (opcode->encoding, *s))
or32_print_immediate (*s, opcode->encoding, insn, info);
else
(*info->fprintf_func) (info->stream, "%c", *s);
}
}
return 4;
}
}
/* This used to be %8x for binutils. */
(*info->fprintf_func)
(info->stream, ".word 0x%08x", insn);
return 4;
}
/* Disassemble a big-endian or32 instruction. */
int
print_insn_big_or32 (memaddr, info)
bfd_vma memaddr;
struct disassemble_info *info;
{
info->private_data = (PTR) find_bytes_big;
return print_insn (memaddr, info);
}
/* Disassemble a little-endian or32 instruction. */
int
print_insn_little_or32 (memaddr, info)
bfd_vma memaddr;
struct disassemble_info *info;
{
info->private_data = (PTR) find_bytes_little;
return print_insn (memaddr, info);
}
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