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commonsubs.c
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/* ************************************************************************ *
* commonsubs.c - Common subroutines and functions that are used *
* by several calls. *
* *
* ************************************************************************ *
* *
* 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 "userdef.h"
#include "modtypes.h"
#include "disglobs.h"
#include "proto.h"
typedef struct modestrs {
char *str;
int CPULvl;
} MODE_STR;
MODE_STR ModeStrings[] = {
{"d%d", 0},
{"a%d", 0},
{"(a%d)", 0},
{"(a%d)+", 0},
{"-(a%d)", 0},
{"%s(a%d)", 0},
{"%s(a%d,%s)", 0}
};
/* The above strings for when the register is A6 (sp) */
MODE_STR SPStrings[] = {
{"", 99999}, /* Should never be used */
{"sp", 0},
{"(sp)", 0},
{"(sp)+", 0},
{"-(sp)", 0},
{"%s(sp)", 0},
{"%s(sp,%s)", 0}
};
/* Need to add for 68020-up modes. Don't know if they can be included in these two arrays or not..*/
MODE_STR Mode07Strings[] = {
{"(%s).w", 0},
{"(%s).l", 0},
{"%s(pc)",0},
{"%s(pc,%s)", 0},
{"#%s", 0}
};
MODE_STR Mode020Strings[] = {
{"(%s,A%d)"}, /* (disp.w,An) */
{"(%s,%s,%s)"}, /* (bd,An,Xn) | (bd,PC,Xn) */
{"([%d,%s],%s,%d)"}, /* ([bd,An],Xn,disp) | ([bd,PC],Xn,disp) */
{"([%d,%s,%s],%d)"}, /* ([bd,An,Xn],disp) | ([bd,PC,Xn],disp) */
};
extern char *SizSufx[];
/* *************
* set_indirect_idx()
* Sets up the string for the Index register for
* Indirect Addressing mode for either
* Address register or PC
* Passed: (1) dest - The location to store the string
* (2) extW - The extWbrief struct containing the
* extended word information.
* Returns: Pointer to the newly-filled dest
*
*/
static int
#ifdef __STDC__
set_indirect_idx (char *dest, struct extWbrief *extW)
#else
set_indirect_idx (dest, extW)
char *dest;
struct extWbrief *extW;
#endif
{
/* Scale not allowed for < 68020 */
/* Note: we might be able to ignore this */
if (cpu < 20)
{
if (extW->scale)
{
return 0;
}
}
sprintf (dest, "%c%d.%c", extW->regNam, extW->regno,
extW->isLong ? 'l' : 'w');
/**dest = extW->regNam;
dest[1] = '\0';
sprintf (rgnum, "%d", extW->regno);
strcat (dest, rgnum);
strcat (dest, extW->isLong ? ".l" : ".w");*/
switch (extW->scale)
{
default:
break; /* No need to specify scale if it's 1 */
case 1:
strcat(dest, "*2");
break;
case 2:
strcat(dest, "*4");
break;
case 3:
strcat(dest, "*8");
break;
}
return 1;
}
/* ------------------------------------------------------------------ *
* get_ext_wrd() - Retrieves the extended command word, and sets up *
* the values. *
* Returns 1 if valid, 0 if cpu < 68020 && is Full Extended Word *
* ------------------------------------------------------------------ */
static int
#ifdef __STDC__
get_ext_wrd (CMD_ITMS *ci, struct extWbrief *extW, int mode, int reg)
#else
get_ext_wrd (ci, extW, mode, reg)
CMD_ITMS *ci;
struct extWbrief *extW;
int mode, reg;
#endif
{
int ew; /* A local copy of the extended word (stored in ci->code[0] */
ew = getnext_w(ci);
if ((cpu < 20) && (ew & 0x0100))
{
ungetnext_w(ci);
return 0;
}
/* get the values common to all */
extW->isLong = (ew >> 11) & 1;
extW->scale = (ew >> 9) & 3;
extW->regno = (ew >> 12) & 7;
extW->isFull = (ew >> 8) & 1;
extW->regNam = dispRegNam[(ew >> 15) & 1];
if (extW->isFull)
{
if (ew & 0x08) /* Bit 3 must be 0 */
{
ungetnext_w(ci);
return 0;
}
extW->iiSel = ew & 7;
extW->bs = (ew >> 7) & 1;
extW->is = (ew >> 6) & 1;
if ((extW->bdSize = (ew >> 4) & 3) == 0)
{
ungetnext_w(ci);
return 0;
}
extW->displ = 0;
}
else
{
extW->displ = ew & 0xff;
if (extW->displ & 0x80)
{
extW->displ = extW->displ | (-1 ^ 0xff);
}
}
return 1;
}
/* *********************
* get_displ() - Get the displacement for either the base displacement
* or the outer displacement, if not suppressed
*/
static void
#ifdef __STDC__
get_displ(CMD_ITMS *ci, char *dst, int siz_flag)
#else
get_displ(ci, dst, siz_flag)
CMD_ITMS *ci; char *dst; int siz_flag;
#endif
{
switch (siz_flag)
{
case 2: /* Word Displacement */
sprintf (dst, "%d.w", getnext_w(ci));
break;
case 3: /* Long Displacement */
sprintf (dst, "%d",
(getnext_w(ci) << 16) | (getnext_w(ci) & 0xffff));
break;
default:
break;
}
}
/* -------------------------
* process_extended_word_full() - Process the extended word for
* indexed modes
*/
static int
#ifdef __STDC__
process_extended_word_full(CMD_ITMS *ci, char *dststr, struct extWbrief *ew, int mode,
int reg, int size)
#else
process_extended_word_full(ci, dststr, ew, mode, reg, siz)
CMD_ITMS *ci; char *dststr; struct extWbrief *ew; int mode;
int reg; int siz;
#endif
{
char base_str[50];
char idx_reg[20];
char od_str[30];
/* Base Displacement */
base_str[0] = '\0';
/* Base Register */
if (ew->bdSize > 1)
{
int pcadj;
get_displ(ci, base_str, ew->bdSize);
if (mode == 7) /* Adjust for PC-Rel mode */
{
sscanf (base_str, "%d", &pcadj);
sprintf (base_str, "%d", pcadj - 2);
}
}
if (ew->bs == 0) /* If not suppressed ... */
{
char br_str[3];
if (strlen(base_str))
{
strcat (base_str, ",");
}
switch (mode)
{
case 6:
sprintf(br_str, "a%d", reg);
strcat (base_str, br_str);
break;
case 7:
strcat(base_str, "pc");
}
}
/* Index Register */
idx_reg[0] = '\0';
if (!ew->is)
{
sprintf(idx_reg, "%c%d.%c", ew->regNam, ew->regno,
ew->isLong ? 'l' : 'w');
if (ew->scale)
{
register int s = 1;
register int m = ew->scale;
while (m--)
{
s *= 2;
}
sprintf (&idx_reg[strlen(idx_reg)], "*%d", s);
}
}
/* Outer Displacement */
od_str[0] = '\0';
if ((ew->iiSel & 3) > 1)
{
get_displ(ci, od_str, ew->iiSel & 3);
}
if(ew->is == 0)
{
switch (ew->iiSel & 4)
{
case 0: /* PreIndexed */
if ((strlen(base_str)) && (strlen(idx_reg)))
{
strcat (base_str, ",");
strcat (base_str, idx_reg);
}
else if (strlen(idx_reg)) /* no base_str */
{
strcpy (base_str, idx_reg);
}
if (strlen(od_str))
{
strcpy(idx_reg, od_str);
}
else
{
idx_reg[0] = '\0';
}
break;
default: /* PostIndexed */
if ((strlen(idx_reg)) && (strlen(od_str)))
{
strcat (idx_reg, ",");
strcat(idx_reg, od_str);
}
else if (strlen(od_str))
{
strcpy (idx_reg, od_str);
}
}
}
else /* else ew->is = 1 */
{
if (ew->iiSel >= 4)
{
while (ci->wcount)
{
ungetnext_w(ci);
}
return 0;
}
/* We have base_str already - empty string if no bd or reg */
if (strlen(od_str))
{
strcpy (idx_reg, od_str);
}
}
if (ew->iiSel & 7)
{
sprintf (dststr, "([%s]", base_str);
}
else
{
sprintf (dststr, "(%s", base_str);
}
if (strlen(idx_reg))
{
if (strlen(base_str) || (ew->iiSel & 3))
{
strcat (dststr, ",");
}
strcat (dststr, idx_reg);
}
strcat(dststr, ")");
return 1;
}
static int
#ifdef __STDC__
process_extended_word_brief(CMD_ITMS *ci, char *dststr, struct extWbrief *ew_b,
int mode, int reg, int size)
#else
process_extended_word_brief(ci, dststr, ew_b, mode, reg, size)
CMD_ITMS *ci; char *dststr; struct extWbrief *ew_b; int mode; int reg; int size;
#endif
{
char a_disp[50];
char idxstr[30];
a_disp[0] = '\0';
/* This is for cpu's < 68020
* for 68020-up, the bd can be up to 32 bits
*/
/*if (abs(ew_b.displ) > 0x80)
{
ungetnext_w(ci);
return 0;
}*/
if (ew_b->displ)
{
if (mode == 7)
{
ew_b->displ -= 2;
}
LblCalc (a_disp, ew_b->displ, AMode, PCPos - 2);
}
if (!set_indirect_idx (idxstr, ew_b))
{
ungetnext_w(ci);
return 0;
}
switch (mode)
{
case 6:
switch (reg)
{
case 7:
sprintf (dststr, SPStrings[mode].str, a_disp, idxstr);
break;
default:
sprintf (dststr, ModeStrings[mode].str, a_disp,
reg, idxstr);
break;
}
break;
case 7: /* PCRel */
sprintf (dststr, Mode07Strings[reg].str, a_disp, idxstr);
break;
default:
return 0;
}
return 1;
}
/* ------------------------
* get_eff_addr() - Build the appropriate opcode string for the command
* and store it in the command structure opcode string
*
* ------------------------- */
int
#ifdef __STDC__
get_eff_addr(CMD_ITMS *ci, char *ea, int mode, int reg, int size)
#else
get_eff_addr(ci, ea, mode, reg, size)
CMD_ITMS *ci;
char * ea;
int size;
int mode;
int reg;
#endif
{
int ext1;
int ext2;
char dispstr[50];
struct extWbrief ew_b;
int ea_addr;
dispstr[0] = '\0';
ea_addr = PCPos;
/* Set up PBytSiz */
switch (size)
{
case SIZ_BYTE:
PBytSiz = 1;
break;
case SIZ_WORD:
PBytSiz = 2;
break;
case SIZ_LONG:
PBytSiz = 4;
break;
}
switch (mode)
{
MODE_STR *a_pt;
default: return 0;
case 0: /* "Dn" */
sprintf(ea, ModeStrings[mode].str, reg);
return 1;
case 1: /* "An" */
if (size < SIZ_WORD)
return 0;
case 2: /* (An) */
case 3: /* (An)+ */
case 4: /* -(An) */
if (reg == 7)
{
a_pt = &SPStrings[mode];
}
else
{
a_pt = &ModeStrings[mode];
}
sprintf(ea, a_pt->str, reg);
return 1;
break;
case 5: /* d{16}An */
AMode = AM_A0 + reg;
ext1 = getnext_w(ci);
/* The system biases the data Pointer (a6) by 0x8000 bytes,
* so compensate
*/
if (reg == 6) {
switch (M_Type)
{
case MT_PROGRAM:
ext1 += 0x8000;
break;
default:
break;
}
}
/* NOTE:: NEED TO TAKE INTO ACCOUNT WHEN DISPLACEMENT IS A LABEL !!! */
LblCalc(dispstr, ext1, AMode, ea_addr);
if (reg == 7)
{
sprintf(ea, SPStrings[mode].str, dispstr);
}
else
{
sprintf (ea, ModeStrings[mode].str,dispstr,reg);
}
return 1;
break;
case 6: /* d{8}(An,Xn) or 68020-up */
AMode = AM_A0 + reg;
if (get_ext_wrd (ci, &ew_b, mode, reg))
{
if (ew_b.isFull)
{
return process_extended_word_full(ci, ea, &ew_b, mode, reg, size);
}
else
{
return process_extended_word_brief(ci, ea, &ew_b, mode, reg, size);
}
/* the displacement should be a string for it may sometimes
* be a label */
/*char a_disp[50];
char idxstr[30];
a_disp[0] = '\0';*/
/* This is for cpu's < 68020
* for 68020-up, the bd can be up to 32 bits
*/
/*if (abs(ew_b.displ) > 0x80)
{
ungetnext_w(ci);
return 0;
}
if (ew_b.displ)
{
LblCalc (a_disp, ew_b.displ, AMode);
}
if (!set_indirect_idx (idxstr, &ew_b))
{
ungetnext_w(ci);
return 0;
}
if (reg == 7)
{
sprintf (ea, SPStrings[mode].str, a_disp, idxstr);
}
else
{
sprintf (ea, ModeStrings[mode].str, a_disp, reg, idxstr);
}*/
return 1;
}
else
{
return 0;
}
/* NOTE:: NEED TO TAKE INTO ACCOUNT WHEN DISPLACEMENT IS A LABEL !!! */
break;
/* We now go to mode %111, where the mode is determined
* by the register field
*/
case 7:
switch (reg) {
case 0: /* (xxx).W */
AMode = AM_SHORT;
ext1 = getnext_w(ci);
/*sprintf (dispstr, "%d", displac_w);*/
LblCalc(dispstr, ext1, AMode, ea_addr);
sprintf (ea, Mode07Strings[reg].str, dispstr);
return 1;
case 1: /* (xxx).L */
AMode = AM_LONG;
ext1 = getnext_w(ci);
ext1 = (ext1 << 16) | (getnext_w(ci) & 0xffff);
LblCalc(dispstr, ext1, AMode, ea_addr);
sprintf (ea, Mode07Strings[reg].str, dispstr);
return 1;
case 4: /* #<data> */
AMode = AM_IMM;
ext1 = getnext_w(ci);
switch (size)
{
case SIZ_BYTE:
if ((ext1 < -128) || (ext1 > 0xff))
{
ungetnext_w(ci);
return 0;
}
break;
case SIZ_WORD:
if ((ext1 < -32768) || (ext1 > 0xffff))
{
ungetnext_w(ci);
return 0;
}
break;
case SIZ_LONG:
ext2 = getnext_w(ci);
ext1 = (ext1 << 16) | (ext2 & 0xffff);
break;
}
LblCalc (dispstr, ext1, AMode, ea_addr);
sprintf (ea, Mode07Strings[reg].str, dispstr);
return 1;
case 2: /* (d16,PC) */
AMode = AM_REL;
ext1 = getnext_w(ci);
/* (ext1 - 2) to reflect PCPos before getnext_w */
/*LblCalc(dispstr, ext1 - 2, AMode, ea_addr);*/
LblCalc(dispstr, ext1, AMode, ea_addr);
sprintf (ea, Mode07Strings[reg].str, dispstr);
return 1;
case 3: /* d8(PC,Xn) */
AMode = AM_REL;
if (get_ext_wrd (ci, &ew_b, mode, reg))
{
if (ew_b.isFull)
{
return process_extended_word_full(ci, ea, &ew_b, mode, reg, size);
}
else
{
return process_extended_word_brief(ci, ea, &ew_b, mode, reg, size);
}
/*char a_disp[50];
char idxstr[30];
if (ew_b.displ)
{
sprintf (a_disp, "%d", ew_b.displ);
}
else
{
a_disp[0] = '\0';
}
if (!set_indirect_idx (idxstr, &ew_b))
{
ungetnext_w(ci);
return 0;
}
sprintf (ea, Mode07Strings[reg].str, a_disp, idxstr);
return 1;
}
else
{
return 0;*/
}
}
}
return 0; /* Return 0 means no effective address was found */
}
/*
* pass_eq() - Skip past the '=' of an assignment, and also skip
* blanks so that on return, the pointer will be positioned
* at the begin of the next string.
*/
char *
#ifdef __STDC__
pass_eq (char *p)
#else
pass_eq (p)
char *p;
#endif
{
while ((*p) && (strchr ("= \t\r\f\n", *p)))
{
++p;
}
if (*p == '\n')
{
*p = 0;
}
return p;
}
/*
* strpos() - Similar to strchr except that it returns the
* base-1 offset from the begin of the string.
*/
int
#ifdef __STDC__
strpos (char *s, char c)
#else
strpos (s, c)
char *s;
char c;
#endif
{
register int p;
return ((p = (int)strchr(s, c)) ? (p - (int)s) : -1);
}
/* **************************************************************** *
* skipblank() passes over any space, tab, or any newline character *
* in the string *
* Passed: p pointer to begin of string to parse *
* Returns: pointer to first character of "valid" data, *
* or null if end of data *
* **************************************************************** */
char *
#ifdef __STDC__
skipblank (char *p)
#else
skipblank (p)
char *p;
#endif
{
/* We did just pass over spaces or tabs, but we need to
* also be sure we are past all return characters
* ( especially the extra character MS-Dos uses
*/
while ((*p) && (strchr (" \t\r\f\n", *p)))
{
++p;
}
if (*p == '\n')
{
*p = 0;
}
return p;
}
/* ------------------------------------------------------------------------ *
* get_extends_common() - Gets the extended data, sets up the ea for calls *
* where the size is the 3 MS=bits of the lower byte of the command, *
* and the EA is the lower 5 bytes of the command word. *
* Passed: (1) - the command items structure *
* (2) - the mnemonic for the call. This routine adds the size *
* descriptor *
* ------------------------------------------------------------------------ */
char *sizebits[] = {".s", ".w", ".l"};
int
#ifdef __STDC__
get_extends_common(CMD_ITMS *ci, char *mnem)
#else
get_extends_common(ci, mnem)
CMD_ITMS *ci;
char *mnem;
#endif
{
int mode, reg;
int size;
char addr_mode[20]; /* Destination for the opcode */
mode = (ci->cmd_wrd >> 3) & 7;
reg = ci->cmd_wrd & 7;
size = (ci->cmd_wrd >> 6) & 3;
get_eff_addr(ci, addr_mode, mode, reg, size);
getnext_w(ci);
if (size > 1) {
getnext_w(ci);
}
return 1;
}
/* ----------------------------------------------------------------- *
* ctl_addrmodesonly - Returns 0 if the addressing mode is anything *
* but a Control addressing mode *
* ----------------------------------------------------------------- */
int
#ifdef __STDC__
ctl_addrmodesonly(int mode, int reg)
#else
ctl_addrmodesonly(mode, reg)
#endif
{
if ((mode < 2) || (mode == 4) || (mode == 8))
return 0;
if (mode == 7)
{
if (mode == 4)
return 0;
}
return 1;
}
/* ----------------------------------------------------------------- *
* reg_ea - Functions that deal with a register and hold the reg # *
* in the command word, and also have an effective address *
* ----------------------------------------------------------------- */
int
#ifdef __STDC__
reg_ea(CMD_ITMS *ci, int j, OPSTRUCTURE *op)
#else
reg_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 >> 7) & 3;
char ea[50];
char *regname = "d";
/* Eliminate illegal Addressing modes */
switch (op->id)
{
case 30: /* chk */
case 137: /* chk 68020 */
switch (size)
{
case 2:
size = SIZ_LONG;
break;
case 3:
size = SIZ_WORD;
break;
default:
return 0;
}
break;
case 70: /* divu */
case 71: /* divs */
case 79: /* mulu */
case 80: /* muls */
if ((mode == 1))
return 0;
break;
case 31: /* lea */
if ((mode < 2) || (mode == 3) || (mode == 4))
return 0;
if ((mode == 7) && (reg == 4))
return 0;
size = SIZ_LONG;
}
switch (op->id)
{
default:
break; /* Already checked above */
}
if (j == 31)
{
regname = "a";
}
if (get_eff_addr(ci, ea, mode, reg, size))
{
sprintf(ci->opcode, "%s,%c%d", ea, regname[0], (ci->cmd_wrd >> 9) & 7);
strcpy (ci->mnem, op->name);
switch (size)
{
case SIZ_BYTE:
strcat(ci->mnem, "b");
break;
case SIZ_WORD:
strcat(ci->mnem, "w");
break;
case SIZ_LONG:
strcat(ci->mnem, "l");
break;
default:
ci->mnem[strlen(ci->mnem) - 1] = '\0';
}
return 1;
}
return 0;
}
/*
* Format a range of registers (``low'' to ``high'')
* into ``s'', beginning with a ``slash'' if necessary.
* ``ad'' specifies either address (A) or data (D) registers.
*/
static char *
#ifdef __STDC__
regwrite(char *s, char *ad, int low, int high, int slash)
#else
regwrite(s, ad, low, high, slash)
char *s; char *ad; int low; int high; int slash;
#endif
{
if (slash)
*s++ = '/';
if (high - low >= 1) {
s += sprintf(s, "%s", ad);
*s++ = low + '0';
*s++ = '-';
s += sprintf(s, "%s", ad);
*s++ = high + '0';
} else if (high - low == 1) {
s += sprintf(s, "%s", ad);
*s++ = low + '0';
*s++ = '/';
s += sprintf(s, "%s", ad);
*s++ = high + '0';
} else {
s += sprintf(s, "%s", ad);
*s++ = high + '0';
}
*s = '\0';
return s;
}
/*
* Format ``regmask'' into ``s''. ``ad'' is a prefix used to indicate
* whether the mask is for address, data, or floating-point registers.
*/