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rof.c
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rof.c
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/* ******************************************************************** *
* rof.c - handles rof files *
* *
* ******************************************************************** *
* *
* 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 <stdio.h>
#include <string.h>
#include <ctype.h>
#include "disglobs.h"
#include "userdef.h"
#define ROF_C
#include "rof.h"
#include "proto.h"
#ifdef __STDC__
static void ROFDataLst (struct rof_extrn *mylist, int maxcount, struct asc_data *ascdat, char cclass);
static void get_refs(char *vname, int count, int ref_typ, char *codebuffer);
#else
void ROFDataLst ();
void get_refs();
#endif
char rname[100];
/*int code_begin;*/
extern int CodeEnd,
PrevEnt;
extern char realcmd[],
pseudcmd[];
/* DEBUGGING function */
void
#ifdef __STDC__
reflst (void)
#else
reflst ()
struct asc_data *cl;
#endif
{
struct rof_extrn * meme = refs_code;
while (meme)
{
fprintf (stderr, "%05x : %-20s (%s)\n", meme->Ofst,
meme->Extrn ? meme->EName.nam : meme->EName.lbl->sname, meme->Extrn ? "Extern" : "Local");
meme = meme->ENext;
}
/*if (cl->LNext)
{
reflst (cl->LNext);
}
printf (" >>> %04x %d\n",cl->start,cl->length);
if (cl->RNext)
{
reflst (cl->RNext);
}*/
}
/* **************************************************************** *
* RealPos() - Returns the correct file position. Returns CmdEnt *
* Non-ROF files, CmdEnt Offset by Code Entry Point *
* **************************************************************** */
int
#ifdef __STDC__
RealEnt(void)
#else
RealEnt()
#endif
{
return IsROF ? (CmdEnt + HdrEnd) : CmdEnt;
}
/* ************************************************************************ *
* AddInitLbls() - Add the initialization data to the Labels Ref *
* On entry, the file pointer is positioned to the begin of the *
* initialized data list for this particular vsect. *
* ************************************************************************ */
void
#ifdef __STDC__
AddInitLbls (struct rof_extrn *tbl, int dataSiz, char klas)
#else
AddInitLbls(tbl, dataSiz, klas);
struct rof_extrn *tbl, int dataSiz; char klas;
#endif
{
char *dataBuf,
*ptr;
int c = 1;
register int refVal;
dataBuf = (char *)mem_alloc(dataSiz + 1);
if (fread (dataBuf, dataSiz, 1, ModFP) == -1)
{
fprintf (stderr, "AddInitLbls(): Failed to read in data for Init Data Buffer");
exit (errno);
}
while (tbl)
{
if (!tbl->Extrn)
{
ptr = &(dataBuf[tbl->Ofst]);
switch (REFSIZ(tbl->Type))
{
case 1: /*SIZ_BYTE:*/
refVal = *ptr & 0xff;
--dataSiz;
break;
case 2: /*SIZ_WORD:*/
/*refVal = 0;
refVal = fread_w(ModFP);*/
refVal = bufReadW(&ptr);
dataSiz -= 2;
break;
default:
refVal = bufReadL(&ptr);
/*refVal = fread_l(ModFP);*/
dataSiz -= 4;
}
tbl->EName.lbl = addlbl(tbl->dstClass, refVal, "");
}
tbl = tbl->ENext;
}
}
/* ************************************************** *
* rofhdr() - read and interpret rof header *
* ************************************************** */
void
#ifdef __STDC__
getRofHdr (FILE *progpath)
#else
rofhdr()
FILE *progpath;
#endif
{
int glbl_cnt,
ext_count,
count; /* Generic counter */
int local_count;
char *codeBuf;
IsROF = TRUE; /* Flag that module is an ROF module */
fseek(progpath, 0, SEEK_SET); /* Start all over */
/* get header data */
//ROFHd.sync = (M_ID << 16) | (fread_w(ModFP) & 0xffff);
ROFHd.sync = fread_l(ModFP);
if (ROFHd.sync != 0xdeadface)
{
errexit ("Illegal ROF Module sync bytes");
}
ROFHd.ty_lan = fread_w(ModFP);
ROFHd.att_rev = fread_w (ModFP); /* Attribute/Revision word */
ROFHd.valid = fread_w (ModFP); /* Nonzero if valid */
ROFHd.series = fread_w (ModFP); /* Assembler version used to compile */
fread(ROFHd.rdate, sizeof(ROFHd.rdate), 1, ModFP);
ROFHd.edition = fread_w(ModFP);;
ROFHd.statstorage = fread_l (ModFP); /* Size of static variable storage */
ROFHd.idatsz = fread_l (ModFP); /* Size of initialized data */
ROFHd.codsz = fread_l (ModFP); /* Size of the object code */
ROFHd.stksz = fread_l (ModFP); /* Size of stack required */
ROFHd.code_begin = fread_l (ModFP); /* Offset to entry point of object code */
ROFHd.utrap = fread_l (ModFP); /* Offset to unitialized trap entry point */
ROFHd.remotestatsiz = fread_l (ModFP); /* Size of remote static storage */
ROFHd.remoteidatsiz = fread_l (ModFP); /* Size of remote initialized data */
ROFHd.debugsiz = fread_l (ModFP); /* Size of the debug */
ROFHd.rname = freadString();
/* Set ModData to an unreasonable high number so ListData
* won't do it's thing...
*/
M_Mem = 0x10000;
/*ModData = 0x7fff;*/
/* ************************************************ *
* Get the Global definitions *
* ************************************************ */
count = glbl_cnt = fread_w (progpath);
while (count--)
{
char *name;
LBLDEF *me;
int adrs;
int typ;
name = freadString();
typ = fread_w (progpath);
adrs = fread_l (progpath);
if (me = addlbl(rof_class(typ, REFGLBL), adrs, name))
{
me->global = 1;
}
}
/* Code section... read, or save file position */
HdrEnd = ftell (progpath);
CodeEnd = ROFHd.codsz;
/* Read code into buffer for get_refs() while we're here */
if (fread ((codeBuf = (char *)mem_alloc(ROFHd.codsz + 1)), ROFHd.codsz, 1, ModFP) == -1)
{
fprintf (stderr, "Failed to read code buffer\n");
}
/*idp_begin = code_begin + rofptr->codsz;
indp_begin = idp_begin + rofptr->idpsz;*/
/*if (fseek (progpath, ROFHd.codsz, SEEK_CUR) == -1)
{
fprintf (stderr, "rofhdr(): Seek error on module\n");
exit (errno);
}*/
/* ********************************** *
* Initialized data Section *
* ********************************** */
IDataCount = ROFHd.idatsz;
IDataBegin = ftell(ModFP);
/* ********************************** *
* External References Section *
* ********************************** */
if (fseek (ModFP, IDataBegin + ROFHd.idatsz + ROFHd.remotestatsiz + ROFHd.debugsiz, SEEK_SET) == -1)
{
fprintf (stderr, "rofhdr(): Seek error on module\n");
exit (errno);
}
ext_count = fread_w (ModFP);
while (ext_count--)
{
char *_name;
int refcount;
_name = freadString();
refcount = fread_w (ModFP);
/* Get the individual occurrences for this name */
get_refs (_name, refcount, REFXTRN, NULL);
}
/* *************************** *
* Local variables... *
* *************************** */
local_count = fread_w (ModFP);
get_refs("", local_count, REFLOCAL, codeBuf);
free (codeBuf);
/* Now we need to add labels for these refs */
/* common block variables... */
/* Do this after everything else is done */
/* NOTE: We may need to save current ftell() to restore it after this */
if (fseek(ModFP, IDataBegin, SEEK_SET) == -1)
{
errexit ("RofLoadInitData() : Failed to seek to begin of Init Data");
}
AddInitLbls (refs_idata, ROFHd.idatsz, '_');
AddInitLbls (refs_iremote, ROFHd.idatsz, 'H');
/* Now we're ready to disassemble the code */
/* Position to begin of Code section */
fseek (progpath, HdrEnd, SEEK_SET);
PCPos = 0;
/* rofdis();*/
}
void
#ifdef __STDC__
RofLoadInitData (void)
#else
ROFLoadInitData()
#endif
{
/* ********************************** *
* Initialized data section *
* ********************************** */
/* ********************************** *
* Initialized remote data Section *
* ********************************** */
/* ********************************** *
* Debug Information Section *
* ********************************** */
}
/* ****************************************************** *
* rof_class () - returns the Destination reference for *
* the reference *
* Passed: The Type byte from the reference *
* Returns: The Class Letter for the entry *
* ****************************************************** */
char
#ifdef __STDC__
rof_class (int typ, int refTy)
#else
rof_class (typ)
int typ; int refTy
#endif
{
/* We'll tie up additional classes for data/bss as follows
* D for data
* _ for init data
* G for remote
* H for remote init
*
*/
switch (refTy)
{
case REFGLBL:
switch (typ & 0x100)
{
case 0: /* NOT common */
switch (typ & 0x04) /* Docs are backward? */
{
case 0: /* Data */
switch (typ & 0x01) /* Docs are backward ? */
{
case 0: /* Uninit */
switch (typ & 0x02)
{
case 0:
return 'D';
default:
return 'G';
}
default: /* Init */
switch (typ & 0x02)
{
case 0:
return '_';
default:
return 'H';
}
}
default: /* Code or Equ */
switch (typ & 0x02)
{
case 0: /* NOT remote */
return 'L';
default:
return 'L'; /* FIXME: This is actually 'equ' */
}
}
default: /* common */
switch (typ & 0x20)
{
case 0: /* NOT Remote */
/* These are WRONG! but for now, we'll use them */
return '_';
default:
return 'D';
}
}
break;
case REFXTRN:
case REFLOCAL:
switch (typ & 0x20)
{
case 0: /* NOT remote */
switch (typ & 0x200)
{
case 0: /* data */
return '_';
default: /* remote */
return 'L';
}
default:
switch (typ & 0x200)
{
case 0: /* code */
return 'L';
default: /* debug */
break;
}
return 'L';
}
}
return 'L'; /* Should never get to here, but for safety's sake */
}
/* ************************************************** *
* rof_addlbl() - Adds a label to the nlist tree if *
* applicable *
* Copies rof name to nlist name if *
* different
* Passed: adrs - address of label *
* ref - reference structure *
* ************************************************** */
//void
//#ifdef __STDC__
//rof_addlbl (int adrs, struct rof_extrn *ref)
//#else
//rof_addlbl (adrs, ref)
// int adrs; struct rof_extrn *ref;
//#endif
//{
// LBLDEF *nl;
//
// /* The following may be a kludge. The problem is that Relative
// * external references get added to class C.
// * Hopefully, no external references are needed in the label ref
// * tables. We'll try this to see...
// */
//
// if (ref->Extrn)
// {
// return;
// }
//
// if ((nl = addlbl (adrs, rof_class (ref->Type, 1), NULL)))
// {
// if (strlen (ref->EName))
// {
// if (strcmp (nl->sname, ref->EName))
// {
// strcpy (nl->sname, ref->EName);
// }
// }
// }
//}
/* ************************************************************** *
* get_refs() - get entries for given reference, *
* either external or local. *
* Passed: name (or blank for locals) *
* count - number of entries to process *
* 1 if external, 0 if local *
* ************************************************************** */
static void
#ifdef __STDC__
get_refs(char *vname, int count, int ref_typ, char *code_buf)
#else
get_refs(vname, count, ref_typ)
char *vname; int count; int refType, int ref_typ;
#endif
{
struct rof_extrn *prevRef = NULL;
char myClass;
unsigned int _ty;
int _ofst;
struct rof_extrn *new_ref,
*curRef,
**base = 0;
while (count--)
{
_ty = fread_w (ModFP);
_ofst = fread_l (ModFP);
/* Skip Debug refs */
if (ref_typ == REFLOCAL)
{
if ((_ty & 0x220) == 0x220)
{
continue;
}
}
/* Add to externs table */
switch (myClass = rof_class(_ty, ref_typ))
{
case 'L':
base = &refs_code;
break;
case 'D':
base = &refs_data;
break;
case '_':
base = &refs_idata;
break;
case 'G':
base = &refs_remote;
break;
case 'H':
base = &refs_iremote;
break;
default:
myClass = 'L'; /* Possibly cause erroneous result, but to avoid crash */
base = &refs_code;
}
/*if ((ref_typ == REFLOCAL) && (myClass == 'L'))
{
}
else*/
{
new_ref = (struct rof_extrn *)mem_alloc(sizeof(struct rof_extrn));
memset (new_ref, 0, sizeof(struct rof_extrn));
new_ref->Type = _ty;
new_ref->Ofst = _ofst;
new_ref->Extrn = (ref_typ == REFXTRN);
if (prevRef)
{
prevRef->MyNext = new_ref;
}
/*base = &refs_data;*/ /* For the time being, let's try to just use one list for all refs */
/* If this tree has not yet been initialized, simply set the
* base pointer to this entry (as the first)
*/
if ( ! *base)
{
*base = new_ref;
}
/* If we get here, this particular tree has alreay been started,
* so find where to put the new entry. Note, for starters, let's
* assume that each entry will be unique, that is, this location
* won't be here
*/
else /* We have entries, insert it into the proper place */
{
curRef = *base;
/*extrns = *base;*/ /* Use the global externs pointer */
if (_ofst < curRef->Ofst)
{
new_ref->ENext = curRef;
curRef->EUp = new_ref;
*base = new_ref;
}
else
{
while ((curRef->ENext) && (_ofst > curRef->ENext->Ofst))
{
curRef = curRef->ENext;
}
/*if (curRef->Ofst > _ofst)
{
curRef = curRef->EUp;
}*/
if (curRef->ENext)
{
curRef->ENext->EUp = new_ref;
}
new_ref->ENext = curRef->ENext;
new_ref->EUp = curRef;
curRef->ENext = new_ref;
}
} /* *base != NULL */
prevRef = new_ref;
if (new_ref->Extrn)
{
new_ref->EName.nam = vname;
}
else
{
register int dstVal;
char *pt = &(code_buf[new_ref->Ofst]);
new_ref->dstClass = rof_class(_ty, REFGLBL);
if ((ref_typ == REFLOCAL) && (myClass == 'L'))
{
switch ((new_ref->Type >> 3) & 3)
{
case 1:
dstVal = *pt & 0xff;
break;
case 2:
dstVal = bufReadW(&pt);
break;
default:
dstVal = bufReadL(&pt);
}
new_ref->EName.lbl = addlbl(new_ref->dstClass, dstVal, "");
}
}
} /* end "if (ref_typ == REFXTRN)" */
} /* end "while (count--) */
}
/* ************************************************** *
* find_extrn() - find an external reference *
* Passed : (1) xtrn - starting extrn ref *
* (2) adrs - Address to match *
* ************************************************** */
struct rof_extrn *
#ifdef __STDC__
find_extrn ( struct rof_extrn *xtrn, int adrs)
#else
find_extrn (xtrn, adrs)
struct rof_extrn *xtrn; int adrs;
#endif
{
int found = 0;
if (!xtrn)
{
return 0;
}
while ((adrs < xtrn->Ofst) && (xtrn->ENext))
{
xtrn = xtrn->ENext;
}
return (xtrn->Ofst == adrs ? xtrn : NULL);
}
/* ******************************************************** *
* Returns the size defined in the type *
* ******************************************************** */
int
#ifdef __STDC__
typeFetchSize (int rtype)
#else
typeFetchSize (rtype)
int rtype;
#endif
{
return (rtype >> 3) & 3;
}
/* ************************************************************ *
* rof_lblref() - Process a label reference found in the code. *
* On entry, Pc points to the begin of the reference *
* Passed: pointer to int variable to store value of operand *
* value *
* Returns: pointer to the rof_extern entry, with a label name *
* added, if applicable *
* ************************************************************ */
struct rof_extrn *
#ifdef __STDC__
rof_lblref (CMD_ITMS *ci, int *value)
#else
rof_lblref (ci, value)
CMD_ITMS *ci;
int *value;
#endif
{
struct rof_extrn *thisref;
register char *refFmt;
if ( ! (thisref = find_extrn (refs_code, PCPos)))
{
return 0;
}
/**value = getc (progpath);
++Pc;*/
switch (typeFetchSize(thisref->Type))
{
case SIZ_BYTE:
*value = getc(ModFP);
refFmt = "%c%02x";
++PCPos;
break;
case SIZ_WORD:
*value = getnext_w(ci);
refFmt = "%c%04x";
break;
case SIZ_LONG:
*value = (getnext_w(ci) & 0xffff) << 16;
*value |= getnext_w(ci) & 0xffff;
refFmt = (*value > 0xffff) ? "%c%04x" : "%c%08x";
break;
}
if ((Pass == 2) && (strlen(thisref->EName.nam) == 0))
{
sprintf (thisref->EName.nam, refFmt, thisref->Type, *value);
}
return thisref;
}
/* ******************************************************** *
* rof_find_asc() - Find an ascii data block def *
* Passed : (1) tree - ptr to asc_dat tree *
* (2) entry - Command entry point (usually CmdEnt *
* Returns: tree entry if present, 0 if no match *
* ******************************************************** */
static struct asc_data *
#ifdef __STDC__
rof_find_asc (struct asc_data *tree, int entry)
#else
rof_find_asc (tree, entry)
struct asc_data *tree; int entry;
#endif
{
if (!tree)
{
return 0;
}
while (1)
{
if (entry < tree->start)
{
if (tree->LNext)
{
tree = tree->LNext;
}
else
{
return 0;
}
}
else
{
if (entry > tree->start)
{
if (tree->RNext)
{
tree = tree->RNext;
}
else
{
return 0;
}
}
else
{
return tree;
}
}
}
}
/* ******************************************************** *
* rof_datasize() - returns the end of rof data area *
* Passed: Label Class letter to search *
* Returns: size of this data area *
* If not a data area, returns 0 *
* ******************************************************** */
int
#ifdef __STDC__
rof_datasize (char cclass)
#else
rof_datasize (cclass)
char cclass;
#endif
{
int dsize;
switch (cclass)
{
case 'D':
dsize = ROFHd.statstorage;
break;
case 'H':
dsize = ROFHd.remoteidatsiz;
break;
case 'G':
dsize = ROFHd.remotestatsiz;
break;
case '_':
dsize = ROFHd.idatsz;
break;
default:
dsize = 0;
}
return dsize;
}
/* ******************************************************************** *
* DataDoBlock - Process a block composed of an initialized reference *
* from a data area *
* Passed : (1) struct rof_extrn *mylist - pointer to tree element *
* (2) int datasize - the size of the area to process *
* (3) char class - the label class (D or C) *
* ******************************************************************** */
static char *
#ifdef __STDC__
DataDoBlock (struct rof_extrn **refsList, LBLDEF **lblList, char *iBuf, int blkEnd,
struct asc_data *ascdat, char cclass)
#else
DataDoBlock (refsList, lblList, iBuf, int blkEnd, ascdat, cclass)
struct rof_extrn **refsList; LBLDEF **lblList; char *iBuf; int blkEnd;
struct asc_data *ascdat, char cclass;
#endif
{
/*struct rof_extrn *srch;*/
CMD_ITMS Ci;
char lblString[200];
memset (&Ci, 0, sizeof(CMD_ITMS));
/* Insert Label if applicable */
if ((*lblList)->myaddr == CmdEnt)
{
strcpy (lblString, (*lblList)->sname);
Ci.lblname = lblString;
if ((*lblList)->global)
{
strcat (Ci.lblname, ":");
}
(*lblList) = (*lblList)->Next;
}
while (PCPos < blkEnd)
{
int bump = 2,
my_val;
CmdEnt = PCPos;
/* First check that refsList is not null. If this vsect has no
* references, 'refsList' will be null
*/
if ( *refsList && ((*refsList)->Ofst == CmdEnt) )
{
strcpy (Ci.mnem, "dc.");
switch (((*refsList)->Type >> 3) & 3)
{
case 1: /* SIZ_BYTE */
strcat (Ci.mnem, "b");
my_val = *(iBuf++);
++PCPos;
break;
case 2: /* SIZ_WORD */
strcat (Ci.mnem, "w");
my_val = bufReadW(&iBuf) & 0xffff;
/*iBuf += 2;*/
/*my_val = (*(iBuf++) << 8) | (*(iBuf++) & 0xff);*/
PCPos += 2;
break;
default: /* SIZ_LONG */
strcat (Ci.mnem, "l");
my_val = bufReadL(&iBuf);
/*iBuf += 4;*/
/*my_val = (*(iBuf++) << 24) | ((*(iBuf++) & 0xff) << 16) | ((*(iBuf++) & 0xff) << 8) |
(*(iBuf++) & 0xff);*/
PCPos += 4;
}
if ((*refsList)->Extrn)
{
strcpy(Ci.opcode, (*refsList)->EName.nam);
}
else
{
strcpy (Ci.opcode, (*refsList)->EName.lbl->sname);
}
PrintLine(pseudcmd, &Ci, cclass, CmdEnt, CmdEnt);
CmdEnt = PCPos;
Ci.lblname = NULL;
Ci.opcode[0] = '\0';
Ci.mnem[0] = '\0';
/*switch ((*refsList)->Type)
{
case REFGLBL:
strcpy(Ci.opcode, (*refsList)->EName.nam);
break;
case REFLOCAL:
strcpy (Ci.opcode, (*refsList)->EName.lbl->sname);
break;
default:
strcpy (Ci.opcode, "???");
}*/
}
else /* No reference entry for this area */
{
register int bytCount,
bytSize;
if (bytCount = DoAsciiBlock (&Ci, iBuf, blkEnd, cclass))
{
iBuf += bytCount;
continue;
}
else
{
register char *fmt;
switch ((blkEnd - PCPos) % 4)
{
case 0:
bytSize = 4;
bytCount = (blkEnd - PCPos) >> 2;
strcpy (Ci.mnem, "dc.l");
fmt = "$%08x";
break;
case 2:
bytSize = 2;
strcpy (Ci.mnem, "dc.w");
bytCount = (blkEnd - PCPos) >> 1;
fmt = "$%04x";
break;
default:
bytSize = 1;
strcpy (Ci.mnem, "dc.b");
bytCount = blkEnd - PCPos;
fmt = "$%02x";
}
while (bytCount--)
{
int val = 0;
switch (bytSize)
{
case 1:
val = *(iBuf++) & 0xff;
break;
case 4:
/*for (byteNum = 0; byteNum < 4; byteNum++)
{
val = (val << 8) | (*(iBuf++) & 0xff);
}*/
val = bufReadL(&iBuf);
/*iBuf += 4;*/
break;
/*val = ((*(iBuf++) & 0xff) << 8) | (*(iBuf++) & 0xff);
val <<= 16;*/
/* Fall through to the 'word' function to pick up next two bytes */
default:
val = bufReadW(&iBuf);
/*iBuf +=2;*/
/*val = val | ((*(iBuf++) & 0xff) << 8) | (*(iBuf++) & 0xff);*/