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opcode00.c
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opcode00.c
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/* ******************************************************************** *
* opcode00.c - Resolves cases where the Opcode is 0000 *
* *
* ******************************************************************** *
* *
* Copyright (c) 2017 David Breeding *
* *
* This file is part of osk-disasm. *
* *
* osk-disasm 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 of the License, or *
* (at your option) any later version. *
* *
* osk-disasm 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 *
* (see the file "COPYING") along with osk-disasm. If not, *
* see <http://www.gnu.org/licenses/>. *
* *
* ******************************************************************** */
#include <string.h>
#include "disglobs.h"
#include "userdef.h"
#include "sysnames.h"
#include "proto.h"
enum {
EA2REG,
REG2EA
};
char *SizSufx[] = {"b", "w", "l"};
extern CONDITIONALS typecondition[];
/*int
#ifdef __STDC__
bitModeRegLegal(int mode, int reg)
#else
bitModeRegLegal(mode, reg)
int mode;
int reg;
#endif
{
if ( ((2 ^ mode) & 0x7d) == 0)
{
return 0;
}
if (mode == 6)
{
if ( ((2 ^ reg) & 3) == 0)
{
return 0;
}
}
}*/
/*int
//#ifdef __STDC__
// bit_movep_immediate (CMD_ITMS *cmditms)
//#else
// bit_movep_immediate (CMD_ITMS *cmdims)
//
// CMD_ITMS *cmditms;
//#endif
//{
// register int firstword = cmditms->cmd_wrd; /* To save calculations */
/* short ext1, ext2;
// int mode,reg;
//
// /* 68020+ code
/* if ((firstword & 0xfff0) == 0x6c) // "rtm"
// {
// //if (cpu >= 2)
// {
// return rtm_020(cmditms);
// }
// // else
// //return 0;
// }*/
/*
// switch (firstword)
// {
// case 0x3c:
// case 0x7c:
// return biti_reg(cmditms, "ori");
// case 0x023c:
// case 0x027c:
// return biti_reg(cmditms, "andi");
// case 0x0a3c:
// case 0x0a7c:
// return biti_reg(cmditms, "eori");
// default:
// break;
// }
//
// /* Handle static bit cmds */
/*
// switch (firstword & 0xffd0)
// {
// case 0x0800:
// return bit_static(cmditms, "btst");
// case 0x0840:
// return bit_static(cmditms, "bchg");
// case 0x0880:
// return bit_static(cmditms, "bclr");
// case 0x8a0:
// return bit_static(cmditms, "bset");
// }
//
// /* Dynamic bit commands */
/*
// switch ((firstword >> 6) & 7)
// {
// case 4:
// if (bit_dynamic(cmditms, "btst"))
// {
// return 1;
// }
// break;
// case 5:
// if (bit_dynamic(cmditms, "bchg"))
// {
// return 1;
// }
// break;
// case 6:
// if (bit_dynamic(cmditms, "bclr"))
// {
// return 1;
// }
// break;
// case 7:
// if (bit_dynamic(cmditms, "bset"))
// {
// return 1;
// }
// break;
//
// }
//
// switch ((firstword >> 8) & 0x0f)
// {
// case 0:
// if (cpu >= 2)
// {
// if ((firstword & 0x1c) == 0x0c) /* "cmp2" or "chk2"? */
/* {
/* For the time being, if this is not a match, simply
* continue */
/*
// if (cmp2_chk2(cmditms))
// return 1;
// }
// }
//
// return (biti_size(cmditms, "ori"));
// break;
// case 0x01:
// return (biti_size(cmditms, "andi"));
// /* Eliminate ccr & SR */
/* break;
// case 0x02:
// return (biti_size(cmditms, "ori"));
// case 0x03:
// if ((firstword & 0x1f0) == 0xf0)
// {
// if (cpu > 2)
// {
// /* Process rtm, callm, cmp2, chk2 */
/* }
// else
// {
// return 0;
// }
// }
// else
// {
// return (biti_size(cmditms, "andi"));
// }
//
// break;
// case 4:
// break;
// case 0x6:
//
// if ((firstword & 0xc0) == 0xc0)
// {
// strcpy(cmditms->mnem, "callm");
// /* special case */
/* }
// else
// {
// return biti_size(cmditms, "addi");
// }
// break;
// case 0x0a:
// strcpy(cmditms->mnem, "eori");
// /* Eliminate ccr & SR */
/* Go process extended command */
/* break;
// case 0x0c:
// return biti_size(cmditms, "cmpi");
// break;
// case 0x08:
// {
// switch ((firstword >> 6) & 3)
// {
// case 0:
// strcpy(cmditms->mnem, "btst");
// break;
// case 1:
// strcpy(cmditms->mnem, "bchg");
// break;
// case 2:
// strcpy(cmditms->mnem, "bclr");
// break;
// case 3:
// strcpy(cmditms->mnem, "bset");
// break;
// }
// }
// case 0x0ff:
// strcpy(cmditms->mnem, "moves");
// break;
// }
//
// /* We need to now check a different set of bits */
/* switch ((firstword >>6) & 0x07)
// {
// case 3:
// if (firstword & 0x800)
// {
// if ((firstword & 0x3f) == 0x3d)
// {
// strcpy(cmditms->mnem, "cas");
// break;
// }
// else
// {
// /* Possible tests needed */
/* strcpy(cmditms->mnem, "cas");
// break;
// }
// }
//
// break;
// case 0x4:
// strcpy(cmditms->mnem, "btst");
// break;
// case 5:
// strcpy(cmditms->mnem, "bchg");
// break;
// case 6:
// strcpy(cmditms->mnem, "bclr");
// break;
// case 7:
// strcpy(cmditms->mnem, "bset");
// break;
// case 10:
// ext1 = getnext_w(cmditms);
// /* Eliminate ccr & SR */
/* switch (cmditms->cmd_wrd & 0xff)
// {
// int regflag = cmditms->cmd_wrd & 0x40; /* 0 if ccr, 1 if sr */
/*
// case 0x3c:
// case 0x7c:
// /* If it's ccr and it's negative, sign extend it */
/* if ((regflag == 0) && ( ext1 & 0x80))
// {
// ext1 |= 0xffff0000;
// }
//
// /* Verify if it's a label */
/* if (regflag == 0)
// {
// sprintf(cmditms->opcode, "#%s,ccr", ext1);
// }
// else
// {
// sprintf (cmditms->opcode, "#%s,sr", ext1);
// }
//
// strcpy(cmditms->mnem,"eori");
// return 1;
// default:
// strcpy (cmditms->mnem, "eori");
// }
// }
//
// if ((firstword & 0x38) == 0x08)
// {
// strcpy(cmditms->mnem, "movep");
// }
//
//
// return 0;
//}*/
/* ******************
* Immediate bit operations involving the status registers
* Returns 1 on success, 0 on failure
*
*/
int
#ifdef __STDC__
biti_reg(CMD_ITMS *ci, int j, OPSTRUCTURE *op)
#else
biti_reg(ci, j, op)
CMD_ITMS *ci;
int j;
OPSTRUCTURE *op;
#endif
{
static char *sr[2] = {"ccr", "sr"};
register int size;
register int ext1 = getnext_w(ci);
size = (ci->cmd_wrd >> 6) & 1;
/* if (ext1 & 0xff00)
{
ungetnext_w(ci);
return 0;
}*/
if ((size == 0) && (ext1 > 0x1f))
{
ungetnext_w(ci);
return 0;
}
/* Add functions to retrieve label */
if (Pass == 2) {
strcpy (ci->mnem, op->name);
sprintf (ci->opcode, "#%d,%s", ext1, sr[size]);
}
return 1;
}
/*
* Immediate bit operations not involving status registers
*
*/
int
#ifdef __STDC__
biti_size(CMD_ITMS *ci, int j, OPSTRUCTURE *op)
#else
biti_size(ci, j, op)
CMD_ITMS *ci;
int j;
OPSTRUCTURE *op;
#endif
{
register int size = (ci->cmd_wrd >> 6) & 3;
register int mode = (ci->cmd_wrd >> 3) & 7;
register int reg;
register int firstword = ci->wcount;
char ea[30];
int data;
EaString[0] = '\0';
reg = (ci->cmd_wrd) & 7;
if ((ci->cmd_wrd & 0x023c) == 0x023c)
{
switch (ci->cmd_wrd)
{
case 0x023c:
strcpy (EaString, "ccr");
size = SIZ_BYTE;
break;
case 0x027c:
strcpy (EaString, "sr");
size = SIZ_WORD;
}
}
else
{
if (size > SIZ_LONG)
{
return 0;
}
if (mode == 1)
{
return 0;
}
if (mode == 7)
{
/* Note: for "cmpi"(0x0cxx), 68020-up allow all codes < 4 */
if (reg > 1)
{
return 0;
}
}
}
/* The source here is always immediate, but go through
* get_eff_addr to get the label, if needed
*/
if (!get_eff_addr (ci, ea, 7, 4, size))
{
return 0;
}
switch (size)
{
case SIZ_BYTE:
data = ci->code[0];
if ((data < -128) || (data > 0xff))
{
ungetnext_w(ci);
return 0;
}
break;
case SIZ_WORD:
data = ci->code[0];
if ((data < -32768) || (data > 0xffff))
{
ungetnext_w(ci);
return 0;
}
break;
case SIZ_LONG:
break;
}
if (strlen(EaString) == 0)
{
if (!get_eff_addr(ci, EaString, mode, reg, SIZ_LONG))
{
return 0;
}
}
sprintf (ci->opcode, "%s,%s", ea, EaString);
strcpy (ci->mnem, op->name);
strcat (ci->mnem, SizSufx[size]);
return 1;
}
int
#ifdef __STDC__
bit_static(CMD_ITMS *ci, int j, OPSTRUCTURE *op)
#else
bit_static(ci, j, op)
CMD_ITMS *ci;
int j;
OPSTRUCTURE *op;
#endif
{
register int ext0,
mode, reg;
char ea[30];
mode = (ci->cmd_wrd >> 3) & 7;
reg = ci->cmd_wrd & 7;
if (mode == 1)
return 0;
ext0 = getnext_w(ci);
/* The MS byte must be zero */
if (ext0 & 0xff00)
{
ungetnext_w(ci);
return 0;
}
/* Also the bt number has limits */
if (((mode > 1) && (ext0 > 7)) || ext0 > 0x1f)
{
ungetnext_w(ci);
return 0;
}
if (get_eff_addr (ci, ea, mode, reg, (ext0 >7) ? SIZ_LONG : SIZ_BYTE))
{
sprintf(ci->opcode, "#%d,%s", ext0, ea);
strcpy(ci->mnem, op->name);
strcat (ci->mnem, (mode == 0) ? "l" : "b");
return 1;
}
return 0;
}
int
#ifdef __STDC__
bit_dynamic(CMD_ITMS *ci, int j, OPSTRUCTURE *op)
#else
bit_dynamic(ci, j, op)
CMD_ITMS *ci;
int j;
OPSTRUCTURE *op;
#endif
{
register int mode, reg;
mode = (ci->cmd_wrd >> 3) & 7;
reg = ci->cmd_wrd & 7;
if (mode == 1)
return 0;
/* switch (op->id)
{
case 4:
if (mode == 4)
return 0;
default:
if (mode > 1)
return 0;
}*/
if (get_eff_addr (ci, EaString, mode, reg, SIZ_LONG))
{
sprintf(ci->opcode,"d%d,%s", (ci->cmd_wrd >>9) & 7, EaString);
strcpy(ci->mnem, op->name);
strcat (ci->mnem, (mode == 0) ? "l" : "b");
return 1;
}
return 0;
}
/*
* Build the "move"/"movea" commands
*
*/
int
#ifdef __STDC__
move_instr(CMD_ITMS *ci, int j, OPSTRUCTURE *op)
#else
move_instr(ci, j, op)
CMD_ITMS *ci;
int j;
OPSTRUCTURE *op;
#endif
{
int d_mode, d_reg, src_mode, src_reg;
char src_ea[50], dst_ea[50];
register int size;
/* Move instructions have size a bit different */
switch ((ci->cmd_wrd >> 12) & 3)
{
case 1:
size = SIZ_BYTE;
break;
case 3:
size = SIZ_WORD;
break;
case 2:
size = SIZ_LONG;
break;
default:
return 0;
}
/* Get Destination EA */
d_mode = (ci->cmd_wrd >> 6) & 7;
d_reg = (ci->cmd_wrd >> 9) & 7;
if ((d_mode == 7) && (d_reg > 1))
{
return 0;
}
src_mode = (ci->cmd_wrd >> 3) & 7;
src_reg = ci->cmd_wrd & 7;
if (get_eff_addr (ci, src_ea, src_mode, src_reg, size))
{
if (get_eff_addr (ci, dst_ea, d_mode, d_reg, size))
{
sprintf(ci->opcode, "%s,%s", src_ea, dst_ea);
strcpy (ci->mnem, "move");
if (((ci->cmd_wrd >> 6) & 7) == 1)
{
strcat(ci->mnem, "a");
}
switch (size)
{
case SIZ_BYTE:
if (((ci->cmd_wrd >> 6) & 7) == 1)
{
return 0;
}
else
{
strcat(ci->mnem, ".b");
}
break;
case SIZ_WORD:
strcat(ci->mnem, ".w");
break;
case SIZ_LONG:
strcat(ci->mnem, ".l");
}
return 1;
}
}
return 0;
}
int
#ifdef __STDC__
move_ccr_sr(CMD_ITMS *ci, int j, OPSTRUCTURE *op)
#else
move_ccr_sr(ci, j, op)
CMD_ITMS *ci;
int j;
OPSTRUCTURE *op;
#endif
{
/* direction is actually 2 bytes, but this lets REG2EA/EA2REG to work */
int dir;
char *statReg;
int mode = (ci->cmd_wrd >> 3) & 7;
int reg = ci->cmd_wrd & 7;
switch (ci->cmd_wrd & 0x0f00)
{
case 0:
statReg = "sr";
dir = REG2EA;
break;
case 0x0200:
statReg = "ccr";
dir = REG2EA;
break;
case 0x400:
statReg = "ccr";
dir = EA2REG;
break;
case 0x600:
statReg = "sr";
dir = EA2REG;
break;
default:
return 0;
}
if (get_eff_addr (ci, EaString, mode, reg, SIZ_WORD))
{
register char *dot;
switch (dir)
{
case EA2REG:
sprintf (ci->opcode, "%s,%s", EaString, statReg);
break;
default:
sprintf (ci->opcode, "%s,%s", statReg, EaString);
}
strcpy (ci->mnem, op->name);
if ((dot = strchr(ci->mnem, '.')))
{
*dot = '\0';
}
return 1;
}
return 0;
}
int
#ifdef __STDC__
move_usp(CMD_ITMS *ci, int j, OPSTRUCTURE *op)
#else
move_usp(ci, j, op)
CMD_ITMS *ci;
int j;
OPSTRUCTURE *op;
#endif
{
register char *dot;
sprintf(EaString, "A%d", ci->cmd_wrd & 7);
if ((ci->cmd_wrd >> 3) & 1)
{
sprintf(ci->opcode, "%s,%s", "usp", EaString);
}
else
{
sprintf (ci->opcode, "%s,%s", EaString, "usp");
}
strcpy (ci->mnem, op->name);
if ((dot = strchr(ci->mnem, '.')))
{
*dot = '\0';
}
return 1;
}
int
#ifdef __STDC__
movep(CMD_ITMS *ci, int j, OPSTRUCTURE *op)
#else
movep(ci, j, op)
CMD_ITMS *ci;
int j;
OPSTRUCTURE *op;
#endif
{
register int addr_reg = ci->cmd_wrd & 7;
register int opMode = (ci->cmd_wrd >> 6) & 7;
register int size = (opMode & 1) ? SIZ_LONG : SIZ_WORD;
char DReg[4];
char AReg[50];
int disp = getnext_w(ci);
static char opcodeFmt[8];
strcpy (opcodeFmt, "%s,%s");
sprintf (DReg, "D%d", (ci->cmd_wrd >> 9) & 7);
sprintf (AReg, "%d(A%d)", disp, addr_reg);
if (opMode & 2)
{
sprintf (ci->opcode, opcodeFmt, DReg, AReg);
}
else
{
sprintf (ci->opcode, opcodeFmt, AReg, DReg);
}
strcpy (ci->mnem, op->name);
strcat( ci->mnem, (size == SIZ_LONG) ? "l" : "w");
return 1;
}
int
#ifdef __STDC__
moveq(CMD_ITMS *ci, int j, OPSTRUCTURE *op)
#else
moveq(ci, j, op)
CMD_ITMS *ci;
int j;
OPSTRUCTURE *op;
#endif
{
register char *dot;
EaString[0] = '\0';
LblCalc(EaString, ci->cmd_wrd & 0xff, AM_IMM, CmdEnt);
sprintf(ci->opcode, "#%s,d%d", EaString, (ci->cmd_wrd >> 9) & 7);
strcpy (ci->mnem, op->name);
if (dot = strchr(ci->mnem, '.'))
{
*dot = '\0';
}
return 1;
}
/* --------------------------------------------------------------- *
* one_ea - A generic handler for when the basic command is a *
* single word and the EA is in the lower 6 bytes *
* --------------------------------------------------------------- */
int
#ifdef __STDC__
one_ea(CMD_ITMS *ci, int j, OPSTRUCTURE *op)
#else
one_ea(ci, j, op)
CMD_ITMS *ci;
int j;
OPSTRUCTURE *op;
#endif
{
int mode = (ci->cmd_wrd >> 3) & 7;
int reg = ci->cmd_wrd & 7;
int size = (ci->cmd_wrd >> 6) & 3;
char ea[50];
if (strchr(op->name, '.'))
{
if (size >= sizeof(SizSufx)/sizeof(SizSufx[0]))
{
return 0;
}
}
if (j == 38) /* swap */
{
sprintf(ci->opcode, "d%d", ci->cmd_wrd & 7);
}
else
{
/* eliminate modes */
switch (op->id)
{
case 38: /* swap */
case 43: /* tst */
break; /* Allow all modes */
case 39: /* pea */
case 57: /* jsr */
case 58: /* jmp */
if ((mode < 2) || (mode == 3) || (mode == 4))
return 0;
default:
if (mode == 1)
return 0;
}
/* Eliminate mode-7 regs */
if (mode == 7)
{
switch (op->id)
{
case 32: /* Allow all modes */
case 38:
break;
case 39:
case 57: /* jsr */
case 58: /* jmp */
if (reg == 4)
return 0;
break;
default:
if (reg > 1)
return 0;
}
}
/* Handle opcode */
if (get_eff_addr(ci, ea, mode, reg, size))
{
switch (op->id)
{
char *statreg = "ccr";
case 28: /* Move from SR */
statreg = "sr";
case 33: /* Move to CCR */
case 35: /* Move from CCR */
if (ci->cmd_wrd & 0x400)
sprintf (ci->opcode, "%s,%s", ea, statreg);
else
sprintf (ci->opcode, "%s,%s", statreg, ea);
break;
default: /* A single ea */
strcpy(ci->opcode, ea);
break;
}
}
else
{
return 0;
}
}
strcpy (ci->mnem, op->name);
if (strchr (ci->mnem, '.'))
{
strcat (ci->mnem, SizSufx[size]);
}
return 1;
}
/* ------------------------------------------------------------------- *
* branch_displ - Calculates the size of a branch and places the size
* suffix in the string provided in the parameters.
* Returns: The branch size (sign extended) if valid, 0 on uneven branch size
*
*/
static int
#ifdef __STDC__
branch_displ (CMD_ITMS *ci, int cmd_word, char *siz_suffix)
#else
branch_displ (ci, cmd_word, siz_suffix)
CMD_ITMS *ci;
int cmd_word;
char *siz_suffix;
#endif
{
register int displ = cmd_word & 0xff;
switch (displ)
{
case 0:
displ = getnext_w(ci);
if (displ & 1)
{
ungetnext_w(ci);
return 0;
}
strcpy (siz_suffix, "w");
break;
case 0xff:
displ = (getnext_w(ci) << 16) | (getnext_w(ci) & 0xffff);
if (displ & 1)
{
ungetnext_w(ci);
ungetnext_w(ci);
return 0;
}
strcpy (siz_suffix, "l");
break;
default:
if (displ & 1)
return 0;
/* Sign extend the 8-bit displacement */
if (displ & 0x80)
{
displ |= (-1 ^ 0xff);
}
strcpy (siz_suffix, "s");
}
return displ;
}
int
#ifdef __STDC__
bra_bsr(CMD_ITMS *ci, int j, OPSTRUCTURE *op)
#else
bra_bsr(ci, j, op)
CMD_ITMS *ci;
int j;
OPSTRUCTURE *op;
#endif
{
register int displ;
register int jmp_base = PCPos;
char siz[4];
displ = branch_displ(ci, ci->cmd_wrd, siz);
if (!IsROF && (displ == 0))
{
return 0;
}
strcpy (ci->mnem, op->name);
strcat (ci->mnem, siz);
/*dstAddr = jmp_base + displ;*/
//if (IsROF && (Pass == 2))
//{
// if (IsRef(ci->opcode, jmp_base))
// {
// return 1;
// }
//}
//process_label (ci, 'L', dstAddr);
LblCalc(ci->opcode, displ, AM_REL, jmp_base);
return 1;
}
int
#ifdef __STDC__
cmd_no_opcode(CMD_ITMS *ci, int j, OPSTRUCTURE *op)