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dismain.c
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dismain.c
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* dismain.c - The main disassembler routine. This handles a single *
* pass for the disassembler routine. For each command, it passes *
* off the job of disassembling that command. *
* *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* *
* 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/>. *
* *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#define _MAIN_ /* We will define all variables in one header file, then
define them extern from all other files */
#include <ctype.h>
#include "disglobs.h"
#include "textdef.h"
#include "modtypes.h"
#include <string.h>
#include "proto.h"
int error;
void reflst();
#ifdef _WIN32
# define strcasecmp _stricmp
#endif
#ifdef _OSK
# define strcasecmp strcmp
#endif
/* Some variables that are only used in one or two modules */
int LblFilz; /* Count of Label files specified */
char *LblFNam[MAX_LBFIL]; /* Pointers to the path names for the files */
static int HdrLen;
int CodeEnd;
extern struct databndaries *dbounds;
extern char realcmd[], pseudcmd[];
#ifdef __STDC__
extern void printXtraBytes (char *);
#else
extern void printXtraBytes ();
#endif
static int get_asmcmd(
#ifdef __STDC__
void
#endif
);
/*
* list_print() - Handle printouts of lines of code. Prints to the listing
* and prints to asm code file if specified
*/
static void
#ifdef __STDC__
list_print (CMD_ITMS *ci, short ent, char *lblnam)
#else
list_print (ci, ent, lblnam)
CMD_ITMS *ci;
int ent;
char *lblnam;
#endif
{
register char *ListFmt = "%05x %04x %10.10s %s %s\n";
register char *CmntFmt = "%05x %04x %10.10s %s %s %s\n";
char *lb;
lb = (lblnam ? lblnam : lblstr('L', CmdEnt));
/* When ready, need to provide for option whether to print or not */
if (ci->comment)
{
printf(CmntFmt, ent & 0xffff, ci->cmd_wrd, lb,
ci->mnem, ci->opcode, ci->comment);
}
else
{
printf(ListFmt, ent & 0xffff, ci->cmd_wrd, lb,
ci->mnem, ci->opcode);
}
/* Provide for printing to asm src listing */
}
static char *DrvrJmps[] = {
"Init", "Read", "Write", "GetStat", "SetStat", "Term", "Except", NULL
};
static char *FmanJmps[] = {"Open", "Create", "Makdir", "Chgdir", "Delete", "Seek",
"Read", "Write", "Readln", "Writeln", "Getstat", "Setstat", "Close", NULL};
/* ***********************
* get_drvr_jmps()
* Read the Driver initialization table and set up
* label names.
*/
static void
#ifdef __STDC__
get_drvr_jmps(int mty)
#else
get_drvr_jmps(mty)
int mty;
#endif
{
register char **pt;
register int jmpdst;
int jmpbegin = ftell (ModFP);
char boundstr[50];
if (mty == MT_DEVDRVR)
{
pt = DrvrJmps;
}
else
{
pt = FmanJmps;
}
while (*pt)
{
jmpdst = fread_w(ModFP);
if (jmpdst)
{
addlbl ('L', jmpdst, *pt);
sprintf (boundstr, "L W L %x-%x", jmpbegin, ftell(ModFP) - 1);
}
else
{
sprintf (boundstr, "L W & %x-%x", jmpbegin, ftell(ModFP) - 1);
}
setupbounds (boundstr);
jmpbegin = ftell(ModFP);
++pt;
}
}
/* ****************************************************** *
* Get the module header. We will do this only in Pass 1 *
* ****************************************************** */
static int
get_modhead()
{
/* Get standard (common to all modules) header fields */
M_ID = fread_w(ModFP) & 0xffff;
switch (M_ID)
{
case 0x4afc:
M_SysRev = fread_w(ModFP);
M_Size = fread_l( ModFP);
M_Owner = fread_l(ModFP);
M_Name = fread_l(ModFP);
M_Accs = fread_w(ModFP);
M_Type = fread_b(ModFP);
M_Lang = fread_b(ModFP);
M_Attr = fread_b(ModFP);
M_Revs = fread_b(ModFP);
M_Edit = fread_w(ModFP);
M_Usage = fread_l(ModFP);
M_Symbol = fread_l(ModFP);
/* We have 14 bytes that are not used */
if (fseek(ModFP, 14, SEEK_CUR) != 0)
{
errexit("Cannot Seek to file location");
}
M_Parity = fread_w(ModFP);
/* Now get any further Mod-type specific headers */
switch (M_Type)
{
case MT_PROGRAM:
case MT_SYSTEM:
case MT_TRAPLIB:
case MT_FILEMAN:
case MT_DEVDRVR:
M_Exec = fread_l(ModFP);
/* Add label for Exception Handler, if applicable */
/* Only for specific Module Types??? */
if (M_Except = fread_l(ModFP))
{
addlbl('L', M_Except, "");
}
/* Add btext */
/* applicable for only specific Moule Types??? */
addlbl ('L', 0, "btext");
HdrEnd = ftell(ModFP); /* We'll keep changing it if necessary */
if ((M_Type != MT_SYSTEM) && (M_Type != MT_FILEMAN))
{
M_Mem = fread_l(ModFP);
if (M_Type != MT_DEVDRVR)
{
M_Stack = fread_l(ModFP);
M_IData = fread_l(ModFP);
M_IRefs = fread_l( ModFP);
if (M_Type == MT_TRAPLIB)
{
M_Init = fread_l(ModFP);
M_Term = fread_l(ModFP);
}
}
HdrEnd = ftell(ModFP); /* The final change.. */
}
if ((M_Type == MT_DEVDRVR) || (M_Type == MT_FILEMAN))
{
fseek (ModFP, M_Exec, SEEK_SET);
get_drvr_jmps (M_Type);
}
if (M_IData)
{
fseek (ModFP, M_IData, SEEK_SET);
IDataBegin = fread_l (ModFP);
IDataCount = fread_l (ModFP);
/* Insure we have an entry for the first Initialized Data */
addlbl ('D', IDataBegin, "");
CodeEnd = M_IData;
}
else
{
/* This may be incorrect */
CodeEnd = M_Size - 3;
}
}
fseek (ModFP, 0, SEEK_END);
if (ftell(ModFP) < M_Size)
{
errexit ("\n*** ERROR! File size < Module Size... Aborting...! ***\n");
}
break;
case 0xdead:
getRofHdr(ModFP);
/*errexit("Disassembly of ROF files is not yet implemented.");*/
break;
default:
errexit("Unknown module type");
}
return 0;
}
/*
* modnam_find() - search a modna struct for the desired value
* Returns: On Success: Pointer to the desired value
* On Failure: NULL
*/
struct modnam *
#ifdef __STDC__
modnam_find (struct modnam *pt, int desired)
#else
modnam_find (pt, desired)
struct modnam *pt;
int desired;
#endif
{
while ((pt->val) && (pt->val != desired))
{
++pt;
}
return (pt->val ? pt : NULL);
}
/* ******************************************************************** *
* RdLblFile() - Reads a label file and stores label values into label *
* tree if value (or address) is present in tree *
* Path to file has already been opened and is stored in "inpath" *
* ******************************************************************** */
static void
#ifdef __STDC__
RdLblFile (FILE *inpath)
#else
RdLblFile (inpath)
FILE *inpath;
#endif
{
char labelname[30],
clas,
eq[10],
strval[15],
*lbegin;
int address;
LBLDEF *nl;
while ( ! feof (inpath))
{
char rdbuf[81];
fgets (rdbuf, 80, inpath);
if ( ! (lbegin = skipblank (rdbuf)) || (*lbegin == '*'))
{
continue;
}
if (sscanf (rdbuf, "%s %s %s %c", labelname, eq, strval, &clas) == 4)
{
#ifdef _OSK
register int c;
#endif
clas = toupper (clas);
#ifdef _OSK
for (c = 0; c < 3; c++)
{
eq[c] = _tolower(eq[c]);
}
#endif
if ( ! strcasecmp (eq, "equ"))
{
/* Store address in proper place */
if (strval[0] == '$') /* if represented in hex */
{
sscanf (&strval[1], "%x", &address);
}
else
{
address = atoi (strval);
}
nl = findlbl (clas, address);
if (nl)
{
strncpy (nl->sname, labelname, sizeof(nl->sname) - 1);
nl->sname[sizeof(nl->sname)] = '\0';
nl->stdname = 1;
}
}
}
}
}
/* ******************************************************** *
* GetLabels() - Set up all label definitions *
* Reads in all default label files and then reads *
* any files specified by the '-s' option. *
* ******************************************************** */
static void
GetLabels () /* Read the labelfiles */
{
register int x;
/* First, get built-in ascii definitions. Later, if desired,
* they can be redefined */
/*for (x = 0; x < 33; x++)
{
if ((nl = FindLbl (ListRoot ('^'), x)))
{
strcpy (nl->sname, CtrlCod[x]);
}
}
if ((nl = FindLbl (ListRoot ('^'), 0x7f)))
{
strcpy (nl->sname, "del");
}*/
/* Next read in the Standard systems names file */
/*if ((OSType == OS_9) || (OSType == OS_Moto))
{
tmpnam = build_path ("sysnames");
if ( ! (inpath = fopen (tmpnam, "rb")))
fprintf (stderr, "Error in opening Sysnames file..%s\n",
filename);
else
{
RdLblFile ();
fclose (inpath);
}
}*/
/* Now read in label files specified on the command line */
for (x = 0; x < LblFilz; x++)
{
register FILE *inpath;
if ((inpath = build_path (LblFNam[x], BINREAD)))
{
RdLblFile (inpath);
fclose (inpath);
}
else
{
fprintf (stderr, "ERROR! cannot open Label File %s for read\n",
LblFNam[x]);
}
}
}
/*
* dopass() - Do a complete single pass through the module.
* The first pass establishes the addresses of necessary labels
* On the second pass, the desired label names have been inserted
* and printing of the listing and writing of the source file is
* done, if either or both is desired.
*/
int
#ifdef __STDC__
dopass(int argc,char **argv,int mypass)
#else
dopass(argc,argv,mypass)
int argc;
char **argv;
int mypass;
#endif
{
int sval = 0;
int lval = 0;
int wval = 0;
if (Pass == 1)
{
if (!(ModFP = fopen(ModFile, BINREAD)))
{
errexit("Cannot open Module file for read");
}
PCPos = 0;
get_modhead();
PCPos = ftell(ModFP);
/*process_label(&Instruction, 'L', M_Exec);*/
addlbl ('L', M_Exec, NULL);
/* Set Default Addressing Modes according to Module Type */
switch (M_Type)
{
case MT_PROGRAM:
strcpy(DfltLbls, "&&&&&&D&&&&L");
break;
case MT_DEVDRVR:
/* Init/Term:
(a1)=Device Dscr
Read/Write,Get/SetStat:
(a1)=Path Dscr, (a5)=Caller's Register Stack
All:
(a1)=Path Dscr
(a2)=Static Storage, (a4)=Process Dscr, (a6)=System Globals
(a1) & (a5) default to Read/Write, etc. For Init/Term, specify
AModes for these with Boundary Defs*/
strcpy (DfltLbls, "&ZD&PG&&&&&L");
break;
}
GetIRefs();
do_cmd_file();
setROFPass();
}
else /* Do Pass 2 Setup */
{
/*parsetree ('A');*/
GetLabels();
/* We do this here so that we can rename labels
* to proper names defined in the ROF file
*/
if (IsROF)
{
setROFPass();
RofLoadInitData();
}
WrtEquates (1);
WrtEquates (0);
/*showem();*/
CmdEnt = 0;
if (IsROF)
{
ROFPsect(&ROFHd);
ROFDataPrint();
}
else
{
PrintPsect();
OS9DataPrint();
}
}
/* NOTE: This is just a temporary kludge The begin _SHOULD_ be
the first byte past the end of the header, but until
we get bounds working, we'll do this. */
if (fseek(ModFP, HdrEnd, SEEK_SET) != 0)
{
errexit("FIle Seek Error");
}
if (IsROF)
{
PCPos = 0;
}
else
{
PCPos = HdrEnd;
}
while (PCPos < CodeEnd)
{
struct databndaries *bp;
memset(&Instruction, 0, sizeof(Instruction));
CmdEnt = PCPos;
/* NOTE: The 6809 version did an "if" and it apparently worked,
* but we had to do this to get it to work with consecutive bounds.
*/
while (bp = ClasHere (dbounds, PCPos))
{
NsrtBnds (bp);
CmdEnt = PCPos;
}
if (get_asmcmd())
{
if (Pass == 2)
{
/*PrintComment('L', CmdEnt, PCPos);*/
Instruction.comment = get_apcomment ('L', CmdEnt);
/*list_print (&Instruction, CmdEnt, NULL);*/
PrintLine (pseudcmd, &Instruction, 'L', CmdEnt, PCPos);
if (PrintAllCode && Instruction.wcount)
{
int count = Instruction.wcount;
char codbuf[50];
int wpos = 0;
/*printf("%6s", "");*/
codbuf[0] = '\0';
while (count)
{
char tmpcod[10];
sprintf (tmpcod, "%04x ", (unsigned short)Instruction.code[wpos++]);
strcat (codbuf, tmpcod);
--count;
// if (count > 1)
// {
// PrintAllCodLine(Instruction.code[wpos],
// Instruction.code[wpos + 1]);
// count -= 2;
// wpos += 2;
// }
// else
// {
// PrintAllCodL1(Instruction.code[wpos]);
// --count;
// ++wpos;
// }
/*printf("%04x ", Instruction.code[count] & 0xffff);*/
}
printXtraBytes (codbuf);
}
}
}
else
{
if (Pass == 2)
{
strcpy (Instruction.mnem, "dc.w");
sprintf (Instruction.opcode, "$%x",
Instruction.cmd_wrd & 0xffff);
PrintLine (pseudcmd, &Instruction, 'L', CmdEnt, PCPos);
CmdEnt = PCPos;
/*list_print (&Instruction, CmdEnt, NULL);*/
}
}
}
if (Pass == 2)
{
WrtEnds();
}
/*reflst();*/
return 0;
}
extern struct rof_extrn *refs_code;
int showem()
{
char c = '_';
struct rof_extrn *rf = refs_code;
LBLCLAS *l = labelclass(c);
if (!rf)
fprintf(stderr, "No Code refs found!\n");
while (rf)
{
fprintf (stderr, "%04x: -> (%03x '%c') \"%-14s\" (%s)\n", rf->Ofst, rf->Type,
rf->dstClass ? rf->dstClass : ' ', rf->Extrn ? rf->EName.nam : rf->EName.lbl->sname,
rf->Extrn ? "Extern" : "Local");
rf = rf->ENext;
}
return 0;
}
static CMD_ITMS *
#ifdef __STDC__
initcmditems (CMD_ITMS *ci)
#else
initcmditems (ci)
CMD_ITMS *ci;
#endif
{
ci->mnem[0] = 0;
ci->wcount = 0;
ci->opcode[0] ='\0';
ci->comment = NULL;
return ci;
}
/*
* noimplemented() - A dummy function which simply returns NULL for instructions
* that do not yet have handler functions
*/
int
#ifdef __STDC__
notimplemented(CMD_ITMS *ci, int tblno, OPSTRUCTURE *op)
#else
notimplemented (ci, tblno, op)
CMD_ITMS *ci;
int tblno;
OPSTRUCTURE *op;
#endif
{
return 0;
}
/*extern OPSTRUCTURE *instr00,*instr01,*instr04,*instr05,*instr06,
*instr07,*instr08,*instr09,*instr11,*instr12,*instr13,*instr14;*/
OPSTRUCTURE *opmains[] =
{
instr00,
instr01,
instr02, /* Repeat 3 times for 3 move sizes */
instr03,
instr04,
instr05,
instr06,
instr07,
instr08,
instr09,
NULL, /* No instr 010 */
instr11,
instr12,
instr13,
instr14,
NULL
};
static int
get_asmcmd()
{
/*extern OPSTRUCTURE syntax1[];
extern COPROCSTRUCTURE syntax2[];*/
register OPSTRUCTURE *optbl;
int opword;
int j;
int size;
size = 0;
Instruction.wcount = 0;
opword = getnext_w (&Instruction);
/* Make adjustments for this being the command word */
Instruction.cmd_wrd = Instruction.code[0] & 0xffff;
Instruction.wcount = 0; /* Set it back again */
/* This may be temporary. Opword %1111xxxxxxxxxxxx is available
* for 68030-68040 CPU's, but we are not yet making this available
*/
if ((opword & 0xf000) == 0xf000)
return 0;
if (!(optbl = opmains[(opword >> 12) & 0x0f]))
{
return 0;
}
for (j = 0; j <= MAXINST; j++)
{
OPSTRUCTURE *curop = &optbl[j];
error = FALSE;
if (!(curop->name))
break;
curop = tablematch (opword, curop);
/* The table must be organized such that the "cpulvl" field
* is sorted in ascending order. Therefore, if a "cpulvl"
* higher than "cpu" is encountered we can abort the search.
*/
if (curop->cpulvl > cpu)
{
return 0;
}
if (!error)
{
if (curop->opfunc(&Instruction, curop->id, curop))
{
return 1;
}
else
{
if (ftell(ModFP) != RealEnt() + 2)
{
fseek(ModFP, RealEnt() + 2, SEEK_SET);
PCPos = CmdEnt + 2;
initcmditems(&Instruction);
}
}
}
}
#if (DEVICE==68040 || COPROCESSOR==TRUE)
for (h = 3; h <= MAXCOPROCINST; h++)
{
error = FALSE;
j = fpmatch (start);
if (!error)
{
size = disassembleattempt (start, j);
if (size != 0)
break;
}
}
#endif
/* if (size == 0)
{
printf ("\n%c%8x", HEXDEL, start);
printf (" %4X\t\t DC.W", get16 (start));
printf (" \t\t? ");
return (2);
}
else
return (size);*/
return 0;
}
/* ******************************************************************** *
* MovBytes() - Reads data for Data Boundary range from input file and *
* places it onto the print buffer (and does any applicable *
* printing if in pass 2). *
* ******************************************************************** */
void
#ifdef __STDC__
MovBytes (struct databndaries *db)
#else
MovBytes (db)
struct databndaries *db;
#endif
{
CMD_ITMS Ci;
char tmps[20];
unsigned int valu;
int bmask;
#ifdef _OSK
static
#endif
char *xFmt[3] = {"$%02x", "$%04x", "$%08x"};
char xtrabytes[50];
int cCount = 0,
maxLst;
char *xtrafmt;
CmdEnt = PCPos;
/* This may be temporary, and we may set PBytSiz
* to the appropriate value */
*xtrabytes = '\0';
strcpy (Ci.mnem, "dc");
Ci.opcode[0] = '\0';
Ci.lblname = "";
Ci.comment = NULL;
Ci.cmd_wrd = 0;
PBytSiz = db->b_siz;
if (PBytSiz < 4)
{
xtrafmt = "%02x";
}
else
{
xtrafmt = "%04x";
}
switch (PBytSiz)
{
case 1:
strcat (Ci.mnem, ".b");
maxLst = 4;
bmask = 0xff;
break;
case 2:
strcat (Ci.mnem, ".w");
maxLst = 2;
bmask = 0xffff;
break;
case 4:
strcat (Ci.mnem, ".l");
maxLst = 1;
bmask = 0xffff;
break;
}
while (PCPos <= db->b_hi)
{
/* Init dest buffer to null string for LblCalc concatenation */
tmps[0] = '\0';
switch (PBytSiz)
{
case 1:
valu = fread_b(ModFP);
break;
case 2:
valu = fread_w (ModFP);
break;
case 4:
valu = fread_l (ModFP);
break;
}
PCPos += db->b_siz;
++cCount;
/*process_label (&Ci, AMode, valu);*/
LblCalc (tmps, valu, AMode, PCPos - db->b_siz);
if (Pass == 2)
{
char tmpval[10];
if (cCount == 0)
{
Ci.cmd_wrd = valu & bmask;
}
else if (cCount < maxLst)
{
Ci.cmd_wrd = ((Ci.cmd_wrd << (PBytSiz * 8)) | (valu & bmask));
}
else
{
sprintf (tmpval, xtrafmt, valu & bmask);
strcat (xtrabytes, tmpval);
}
++cCount;
if (strlen(Ci.opcode))
{
strcat (Ci.opcode, ",");
}
strcat (Ci.opcode, tmps);
/* If length of operand string is max, print a line */
if ( (strlen (Ci.opcode) > 22) || findlbl ('L', PCPos))
{
PrintLine(pseudcmd, &Ci, 'L', CmdEnt, PCPos);
if (strlen(xtrabytes))
{
printXtraBytes (xtrabytes);
}
Ci.opcode[0] = '\0';
Ci.cmd_wrd = 0;
Ci.lblname = NULL;
CmdEnt = PCPos/* _ PBytSiz*/;
cCount = 0;
}
}
/*PCPos += PBytSiz;*/
}
/* Loop finished.. print any unprinted data */
if ((Pass == 2) && strlen (Ci.opcode))
{
PrintLine (pseudcmd, &Ci, 'L', CmdEnt, PCPos);
if (strlen(xtrabytes))
{
printXtraBytes (xtrabytes);
}
}
}
/* ******************************************
* MovAsc() - Move nb byes fordcb" statement
*/
void
#ifdef __STDC__
MovASC (int nb, char aclass)
#else
MovASC (nb, aclass)
int nb;
char aclass;
#endif
{
char oper_tmp[30];
CMD_ITMS Ci;
int cCount = 0;
strcpy (Ci.mnem, "dc.b"); /* Default mnemonic to "fcc" */
CmdEnt = PCPos;
*oper_tmp = '\0';
Ci.cmd_wrd = 0;
Ci.comment = NULL;
Ci.lblname = "";
while (nb--)
{
register int x;
char c[6];
if ((strlen (oper_tmp) > 24) ||
(strlen (oper_tmp) && findlbl (aclass, PCPos)))
/*(strlen (oper_tmp) && findlbl (ListRoot (aclass), PCPos + 1)))*/
{
sprintf (Ci.opcode, "\"%s\"", oper_tmp);
PrintLine (pseudcmd, &Ci, 'L', CmdEnt, PCPos);
oper_tmp[0] = '\0';
CmdEnt = PCPos;
Ci.lblname = "";
Ci.cmd_wrd = 0;
Ci.wcount = 0;
cCount = 0;
}
x = fgetc (ModFP);