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windows-server-2003/sdktools/link16/newout3.c

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/*
* Copyright Microsoft Corporation 1986,1987
*
* This Module contains Proprietary Information of Microsoft
* Corporation and should be treated as Confidential.
*/
/*
* NEWOUT3.C
*
* Functions to output DOS3 exe.
*/
#include <minlit.h> /* Types and constants */
#include <bndtrn.h> /* Types and constants */
#include <bndrel.h> /* Types and constants */
#include <lnkio.h> /* Linker I/O definitions */
#include <lnkmsg.h> /* Error messages */
#include <extern.h> /* External declarations */
#include <sys\types.h>
#include <sys\stat.h>
#include <newexe.h>
#define E_VERNO(x) (x).e_sym_tab
#define IBWCHKSUM 18L
#define IBWCSIP 20L
#define CBRUN sizeof(struct exe_hdr)
#define CBRUN_OLD 0x1e /* Size of header for DOS 1, 2 & 3 */
#define EMAGIC 0x5A4D /* Old magic number */
FTYPE parity; /* For DOS3 checksum */
SEGTYPE segAdjCom = SEGNIL; /* Segment moved by 0x100 in .com programs */
/*
* LOCAL FUNCTION PROTOTYPES
*/
#if OVERLAYS
LOCAL void NEAR OutRlc(IOVTYPE iov);
#endif
#if QBLIB
LOCAL unsigned short NEAR SkipLead0(unsigned short seg);
LOCAL void NEAR FixQStart(long cbFix,struct exe_hdr *prun);
#endif
/****************************************************************
* *
* OutRlc: *
* *
* This function writes the reloc table to the run file. *
* NOTE: relocation table entries must be a factor of the *
* virtual memory page length. *
* *
****************************************************************/
#if OVERLAYS
LOCAL void NEAR OutRlc(IOVTYPE iov)
{
RUNRLC FAR *pRlc;
pRlc = &mpiovRlc[iov];
WriteExe(pRlc->rgRlc, CBRLC*pRlc->count);
}
#endif
void OutHeader (prun)
struct exe_hdr *prun;
{
WriteExe(prun, E_LFARLC(*prun));
}
#if INMEM
#if CPU8086 OR CPU286
#include <dos.h>
/*
* WriteExe : write() with a far buffer
*
* Emulate write() except use a far buffer. Call the system
* directly.
*
* Returns:
* 0 if error, else number of bytes written.
*/
LOCAL int WriteExe (fh, buf, n)
int fh; /* File handle */
char FAR *buf; /* Buffer to store bytes in */
int n; /* # bytes to write */
{
#if OSMSDOS
#if CPU8086
union REGS regs; /* Non-segment registers */
struct SREGS sregs; /* Segment registers */
regs.x.ax = 0x4000;
regs.x.bx = fh;
regs.x.cx = n;
sregs.ds = FP_SEG(buf);
sregs.es = sregs.ds;
regs.x.dx = FP_OFF(buf);
intdosx(&regs,&regs,&sregs);
if(regs.x.cflag)
return(0);
return(regs.x.ax);
#else
ERROR
#endif
#endif /* OSMSDOS */
#if OSXENIX
char mybuf[PAGLEN];
int cppage;
char *p;
while(n > 0)
{
cppage = n > PAGLEN ? PAGLEN : n;
for(p = mybuf; p < mybuf[cppage]; *p++ = *buf++);
if(write(fh,mybuf,cppage) != cppage)
return(0);
n -= cppage;
}
#endif
}
#else
#define readfar read
#endif
extern WORD saExe;
LOCAL void OutExeBlock (seg1, segEnd)
{
long cb;
unsigned cbWrite;
WORD sa;
FTYPE parity; /* 1 odd, 0 even */
fflush(bsRunfile);
parity = 0;
cb = ((long)(mpsegsa[segEnd] - mpsegsa[seg1]) << 4) + mpsegcb[segEnd] +
mpsegraFirst[segEnd];
sa = saExe;
while(cb)
{
if(cb > 0xfff0)
cbWrite = 0xfff0;
else
cbWrite = cb;
ChkSum(cbWrite,(BYTE FAR *)((long) sa << 16),parity);
parity = parity ^ (cbWrite & 1);
if(WriteExe(fileno(bsRunfile),(long)sa << 16,cbWrite) != cbWrite)
{
ExitCode = 4;
Fatal(ER_spcrun); /* Fatal error */
}
cb -= cbWrite;
sa += 0xfff;
}
}
#endif /* INMEM */
#if QBLIB
/*
* SkipLead0 : Output a segment, skipping leading zeroes
*
* Count the number of leading 0s in the segment and write
* a word holding the count. Then write the segment starting
* with the first nonzero byte. Return number of leading 0s.
*
* Parameters:
* seg Segment number
* Returns:
* Number of leading 0s
*/
WORD NEAR SkipLead0 (SEGTYPE seg)
{
BYTE FAR *pSegImage; // Segment memory image
long cZero; // Number of zero bytes at the begin of the segment
WORD cbSkip; /* # bytes of leading 0s */
DWORD cbRemain; // no-zero bytes
// Initialize starting address
pSegImage = mpsegMem[seg] + mpsegraFirst[seg];
// Count zero bytes at segment start
for (cZero = 0; cZero < mpsegcb[seg] && *pSegImage == 0; cZero++, pSegImage++)
;
// If segment is 64K and entirely 0s, write 0 and 64k of zeros.
if (cZero == mpsegcb[seg] && cZero == LXIVK)
{
cbSkip = 0;
pSegImage = mpsegMem[seg] + mpsegraFirst[seg];
cbRemain = LXIVK;
}
else
{
cbSkip = (WORD) cZero;
cbRemain = mpsegcb[seg] - cZero;
}
WriteExe((char FAR *)&cbSkip, CBWORD);
WriteExe(pSegImage, cbRemain);
return(cbSkip);
}
/*
* FixQStart : Fix up (patch) .QLB starting address
*
* Parameters:
* cbFix Number of bytes skipped (may be negative)
* prun Pointer to DOS3 exe header
* ASSUMES:
* File pointer is at CS:IP.
*/
void NEAR FixQStart (cbFix,prun)
long cbFix;
struct exe_hdr *prun;
{
/*
* WARNNG: dra must be long since it holds numbers in the range
* -4 to 0x10000, inclusive.
*/
long dra; /* Delta for raStart adjustment */
SATYPE saStart; /* Initial CS */
saStart = prun->e_cs; /* Initialize */
/*
* Adjust initial CS:IP for .QLB's since it is used by loader
* to point to symbol table, and all addresses are off by the
* amount of leading 0s skipped. Luckily CS:IP comes right after
* checksum so we don't have to seek.
* First, normalize CS:IP downward if underflow will occur.
*/
if((dra = cbFix - raStart) > 0)
{
raStart += (dra + 0xf) & ~0xf;
saStart -= (SATYPE) ((dra + 0xf) >> 4);
}
/* Patch the header */
OutWord((WORD) (raStart -= cbFix));
OutWord(saStart);
}
#endif /*QBLIB*/
/*
* OutDos3Exe:
*
* Output DOS3-format executable file.
* Called by OutRunfile.
*/
void NEAR OutDos3Exe()
{
SEGTYPE seg; /* Current segment */
struct exe_hdr run; /* Executable header */
WORD cbPadding; /* # bytes of padding */
WORD cb; /* # bytes on last page */
WORD pn; /* # pages */
long lfaPrev; /* Previous file offset */
RATYPE ra; /* Current address offset */
SATYPE sa; /* Current address base */
SEGTYPE segIovFirst; /* First segment in overlay */
SEGTYPE segFinaliov; /* Last seg in overlay to output */
SEGTYPE segIovLast; /* Last segment in overlay */
long cbDirectory; /* # bytes in entire header */
WORD cparDirectory; /* # para. in entire header */
SEGTYPE segStack; /* Segment index of stack segment */
#if OVERLAYS
IOVTYPE iov; /* Current overlay number */
#endif
#if FEXEPACK
FTYPE fSave; /* Scratch var. */
#endif
SATYPE saStart; /* Start of current segment */
WORD segcbDelta = 0; /* For /TINY segment size adjustment */
WORD fOrgStriped = FALSE;
/* TRUE when 0x100 bytes striped */
WORD tmp;
#if OVERLAYS
DWORD ovlLfa; /* Seek offset for overlay */
DWORD imageSize; /* Overlay memory image size */
DWORD ovlRootBeg = 0; /* Seek offset to the begin of root memory image */
WORD ovlDataOffset;
#endif
#if QBLIB
/* Count of bytes skipped in the load image must be a long since
* it can be negative (if there were less than 4 leading 0s)
* or greater than 0x8000.
*/
long cbSkip = 0; /* # bytes skipped */
extern SEGTYPE segQCode; /* .QLB code segment */
#endif
if (fBinary)
{
#if OVERLAYS
if (fOverlays)
Fatal(ER_swbadovl, "/TINY");
/* Overlays not allowed in .COM */
#endif
if (mpiovRlc[0].count)
Fatal(ER_binary); /* Run time relocations not allowed in .COM */
}
memset(&run,0,sizeof(run)); /* Clear everything in fixed header */
E_MAGIC(run) = EMAGIC; /* Magic number */
if (vFlagsOthers & NENEWFILES || fDOSExtended)
{
/* DOS header is 0x40 bytes long */
E_LFARLC(run) = CBRUN; /* Offset of loadtime relocations */
if (vFlagsOthers & NENEWFILES)
E_FLAGS(run) |= EKNOWEAS;
if (fDOSExtended)
E_FLAGS(run) |= EDOSEXTENDED;
}
else
{
/* DOS header is 0x1e bytes long */
E_LFARLC(run) = CBRUN_OLD; /* Offset of loadtime relocations */
}
E_VERNO(run) = 1; /* DOS ver. for compatibility only */
lfaPrev = 0L;
#if OVERLAYS
for(iov = 0; iov < (IOVTYPE) iovMac; ++iov) /* Loop thru overlays */
{
#endif
/* Get size of overlay */
cb = 0;
pn = 0;
#if OVERLAYS
/* Find lowest seg in overlay */
for(seg = 1; seg <= segLast && mpsegiov[seg] != iov; ++seg)
#else
seg = 1;
#endif
/* If no overlay to output, we're done with this one. */
if(seg > segLast)
#if OVERLAYS
continue;
#else
return;
#endif
/* Get starting address of lowest segment */
segIovFirst = seg;
ra = mpsegraFirst[seg];
sa = mpsegsa[seg];
/* Find the last segment in the overlay */
segIovLast = SEGNIL;
for(seg = segLast; seg; --seg)
{
#if OVERLAYS
if(mpsegiov[seg] == iov)
{
#endif
if(segIovLast == SEGNIL) segIovLast = seg;
if(!cparMaxAlloc) break;
if((mpsegFlags[seg] & FNOTEMPTY) == FNOTEMPTY) break;
#if OVERLAYS
}
#endif
}
/* If no data in overlay, we're done with it. */
if(!seg)
#if OVERLAYS
continue;
#else
return;
#endif
/* Get size in between 1st, last segs in this overlay */
segFinaliov = seg;
sa = mpsegsa[seg] - sa - 1;
ra = mpsegraFirst[seg] - ra + 16;
/* Normalize */
sa += (SATYPE) (ra >> 4);
ra &= 0xF;
/* Take into account size of last segment */
if(mpsegcb[seg] + ra < LXIVK)
ra += (WORD) mpsegcb[seg];
else
{
ra -= LXIVK - mpsegcb[seg];
sa += 0x1000;
}
/* Normalize again */
sa += (SATYPE) (ra >> 4);
ra &= 0xF;
/* Determine # pages, bytes on last page */
pn = sa >> 5;
cb = (WORD) (((sa << 4) + ra) & MASKRB);
E_CBLP(run) = cb;
if(cb)
{
cb = 0x200 - cb;
++pn;
}
/* If empty overlay, skip it */
#if OVERLAYS
if(iov && !pn)
continue;
#else
if(!pn) return;
#endif
vchksum = parity = 0; /* Initialize check sum */
if (segStart == SEGNIL)
{
if (fBinary)
OutWarn(ER_comstart);
#if 0
else
OutWarn(ER_nostartaddr);
#endif
}
else if (mpsegiov[segStart] != IOVROOT)
Fatal(ER_ovlstart); /* Starting address can't be in overlay */
E_CS(run) = mpsegsa[segStart]; /* Base of starting segment */
E_IP(run) = (WORD) raStart; /* Offset of starting procedure */
#if QBLIB
/*
* For .QLB, set minalloc field to an impossible amount to force
* DOS3 loader to abort.
*/
if(fQlib)
E_MINALLOC(run) = 0xffff;
else
#endif
/* If no uninitialized segments, minalloc = 0 */
if (segFinaliov == segIovLast)
E_MINALLOC(run) = 0;
else
{
/* Otherwise determine the minalloc value: */
/* sa:ra is end of overlay being output. Find empty area size */
sa = mpsegsa[segIovLast] - sa - 1;
ra = mpsegraFirst[segIovLast] - ra + 0x10;
/* Add in last segment size */
if(mpsegcb[segIovLast] + ra < LXIVK) ra += mpsegcb[segIovLast];
else
{
ra -= LXIVK - mpsegcb[segIovLast];
sa += 0x1000;
}
/* Normalize */
sa += (SATYPE) (ra >> 4);
ra &= 0xF;
/* Set field with min. no of para.s above image */
E_MINALLOC(run) = (WORD) (sa + ((ra + 0xF) >> 4));
/* If /HIGH not given, then cparmaxAlloc = max(maxalloc,minalloc) */
if(cparMaxAlloc && E_MINALLOC(run) > cparMaxAlloc)
cparMaxAlloc = E_MINALLOC(run);
}
E_MAXALLOC(run) = cparMaxAlloc;
#if OVERLAYS
E_CRLC(run) = mpiovRlc[iov].count;
#else
E_CRLC(run) = mpiovRlc[0].count;
#endif
segStack = mpgsnseg[gsnStack];
E_SS(run) = mpsegsa[segStack];
E_SP(run) = (WORD) (cbStack + mpsegraFirst[segStack]);
E_CSUM(run) = 0;
E_CP(run) = pn;
/* Get true size of header */
#if OVERLAYS
cbDirectory = (long) E_LFARLC(run) + ((long) mpiovRlc[iov].count << 2);
#else
cbDirectory = (long) E_LFARLC(run) + ((long) mpiovRlc[0].count << 2);
#endif
/* Get padding needed for header */
if (fBinary)
cbPadding = 0;
else
cbPadding = (0x200 - ((WORD) cbDirectory & 0x1FF)) & 0x1FF;
/* Pages in header */
pn = (WORD)((cbDirectory + 0x1FF) >> 9);
cparDirectory = pn << SHPNTOPAR; /* Paragraphs in header */
E_CPARHDR(run) = cparDirectory; /* Store in header */
E_CP(run) += pn; /* Add header pages to file size */
#if OVERLAYS
E_OVNO(run) = iov;
#else
E_OVNO(run) = 0;
#endif
ovlLfa = ftell(bsRunfile);
if (fBinary)
{
if (E_IP(run) != 0 && E_IP(run) != 0x100)
OutWarn(ER_comstart);
}
else
OutHeader(&run);
/* Output relocation table. Turn exepack off first. */
#if FEXEPACK
fSave = fExePack;
fExePack = FALSE;
#endif
#if OVERLAYS
if (!fBinary)
OutRlc(iov);
#else
if (!fBinary)
OutRlc();
#endif
/* Restore exepack */
#if FEXEPACK
fExePack = fSave;
#endif
/* Output padding */
WriteZeros(cbPadding);
ra = mpsegraFirst[segIovFirst]; /* Offset of first segment */
sa = mpsegsa[segIovFirst]; /* Base of first segment */
#if INMEM
if(saExe)
OutExeBlock(segIovFirst,segFinaliov);
else
#endif
/* Loop through segs in overlay */
if (!iov)
ovlRootBeg = ftell(bsRunfile);
for(seg = segIovFirst; seg <= segFinaliov; ++seg)
{
#if OVERLAYS
if(mpsegiov[seg] == iov)
{
#endif
/*
* Pad up to start of segment. First determine destination
* segment address. We could just use mpsegsa[seg] were it
* not for packcode.
*/
saStart = (SATYPE) (mpsegsa[seg] + (mpsegraFirst[seg] >> 4));
tmp = 0;
while(ra != (mpsegraFirst[seg] & 0xf) || sa < saStart)
{
#if FEXEPACK
if (fExePack)
OutPack("\0", 1);
else
#endif
tmp++;
if(++ra > 0xF)
{
ra &= 0xF;
++sa;
}
parity ^= 1;
}
if (!fExePack && tmp)
WriteZeros(tmp);
/* Output the segment and update the address */
#if QBLIB
/*
* If /QUICKLIB and segment is 1st in DGROUP or 1st code,
* skip leading 0s and adjust the count, less 2 for the
* count word.
*/
if(fQlib && (seg == mpgsnseg[mpggrgsn[ggrDGroup]] ||
seg == segQCode))
cbSkip += (long) SkipLead0(seg) - 2;
else
#endif
{
if (fBinary && !fOrgStriped && mpsegcb[seg] > 0x100)
{
/*
* For .Com files strip first 0x100 bytes
* from the first non-empyt segment
*/
mpsegraFirst[seg] += E_IP(run);
mpsegcb[seg] -= E_IP(run);
segcbDelta = E_IP(run);
fOrgStriped = TRUE;
segAdjCom = seg;
}
if (mpsegMem[seg])
{
#if FEXEPACK
if (fExePack)
OutPack(mpsegMem[seg] + mpsegraFirst[seg], mpsegcb[seg]);
else
#endif
WriteExe(mpsegMem[seg] + mpsegraFirst[seg], mpsegcb[seg]);
if (seg != mpgsnseg[gsnOvlData])
FFREE(mpsegMem[seg]);
}
}
mpsegcb[seg] += segcbDelta;
segcbDelta = 0;
sa += (WORD)(mpsegcb[seg] >> 4);
ra += (WORD)(mpsegcb[seg] & 0xF);
if(ra > 0xF)
{
ra &= 0xF;
++sa;
}
#if OVERLAYS
}
#endif
}
#if FALSE
if (!fBinary)
{
/* Complement checksum, go to checksum field and output it. */
vchksum = (~vchksum) & ~(~0 << WORDLN);
fseek(bsRunfile,lfaPrev + IBWCHKSUM,0);
OutWord(vchksum);
}
#endif
#if QBLIB
/*
* If /QUICKLIB, patch the starting address which has been
* invalidated by processing leading 0s.
*/
if(fQlib)
{
// Seek to the CS:IP field
if (fseek(bsRunfile,lfaPrev + IBWCSIP,0))
Fatal(ER_badobj);
FixQStart(cbSkip,&run);
}
#endif
#if FEXEPACK
/* Finish up with exepack stuff if necessary */
if (fExePack)
{
EndPack(&run);
cb = 0x1ff & (0x200 - E_CBLP(run)); /* Correct cb */
fExePack = FALSE; /* In case of overlays */
}
#endif
#if OVERLAYS
/*
* If not last overlay: return to end of file, pad to page boundary,
* and get length of file.
*/
if (fseek(bsRunfile,0L,2))
Fatal(ER_badobj);
if (iov != (IOVTYPE) (iovMac - 1))
{
while(cb--) OutByte(bsRunfile,'\0');
}
lfaPrev = ftell(bsRunfile);
if (fDynamic)
{
// Update $$MPOVLLFA and $$MPOVLSIZE tables
//
// OVERLAY_DATA --> +-------------+
// | DW $$CGSN |
// +-------------+
// | DW $$COVL |
// +-------------+
// | $$MPGSNBASE |
// | osnMac * DW |
// +-------------+
// | $$MPGSNOVL |
// | osnMac * DW |
// +-------------+
// | $$MPOVLLFA |
// | iovMac * DD |
// +-------------+
// | $$MPOVLSIZE |
// | iovMac * DD |
// +-------------+
vgsnCur = gsnOvlData;
ovlDataOffset = 4 + (osnMac << 2) + iov * sizeof(DWORD);
MoveToVm(sizeof(DWORD), (BYTE *) &ovlLfa, mpgsnseg[gsnOvlData], ovlDataOffset);
ovlDataOffset += iovMac << 2;
// Exclude the header size
imageSize = ((DWORD) (E_CP(run) - (E_CPARHDR(run) >> SHPNTOPAR) - 1) << 9) + (E_CBLP(run) ? E_CBLP(run) : 512);
imageSize = ((imageSize + 0xf) & ~0xf) >> 4;
imageSize += E_MINALLOC(run);
if ((imageSize<<4) > LXIVK && iov)
Fatal(ER_ovl64k, iov);
MoveToVm(sizeof(DWORD), (BYTE *) &imageSize, mpgsnseg[gsnOvlData], ovlDataOffset);
}
}
#endif
if (E_MINALLOC(run) == 0 && E_MAXALLOC(run) == 0)
OutError(ER_nosegdef); /* No code or initialized data in .EXE */
if (fDynamic)
{
// Patch $$MPOVLLFA and $$MPOVLSIZE table in the .EXE file
seg = mpgsnseg[gsnOvlData];
if (fseek(bsRunfile, ovlRootBeg + ((long) mpsegsa[seg] << 4), 0))
Fatal(ER_badobj);
WriteExe(mpsegMem[seg] + mpsegraFirst[seg], mpsegcb[seg]);
FFREE(mpsegMem[seg]);
}
if (fExeStrSeen)
{
if (fseek(bsRunfile,0L,2))
Fatal(ER_badobj);
WriteExe(ExeStrBuf, ExeStrLen);
}
#if SYMDEB
if (fSymdeb)
{
if (fBinary)
{
/*
* For .COM files CV info goes into separate file.
*/
SBTYPE sbDbg; /* .DBG file name */
AHTEPTR hte; /* Hash table entry address */
struct _stat fileInfo;
_fstat(fileno(bsRunfile), &fileInfo);
CloseFile(bsRunfile);
hte = (AHTEPTR ) FetchSym(rhteRunfile,FALSE);
/* Get run file name */
#if OSMSDOS
if(hte->cch[2] != ':')
{ /* If no drive spec */
sbDbg[1] = chRunFile;
/* Use saved drive letter */
sbDbg[2] = ':'; /* Put in colon */
sbDbg[0] = '\002'; /* Set length */
}
else
sbDbg[0] = '\0'; /* Length is zero */
memcpy(&sbDbg[B2W(sbDbg[0]) + 1],&GetFarSb(hte->cch)[1],B2W(hte->cch[0]));
/* Get name from hash table */
sbDbg[0] += (BYTE)hte->cch[0];
/* Fix length */
#else
memcpy(sbDbg,GetFarSb(hte->cch),B2W(hte->cch[0]) + 1);
/* Get name from hash table */
#endif
UpdateFileParts(sbDbg, sbDotDbg);
/* Force extension to .DBG */
sbDbg[B2W(sbDbg[0]) + 1] = '\0';
/* Null-terminate name */
if((bsRunfile = fopen(&sbDbg[1], WRBIN)) == NULL)
Fatal(ER_openw, &sbDbg[1]);
#if OSMSDOS
setvbuf(bsRunfile,bigbuf,_IOFBF,sizeof(bigbuf));
#endif
/* Write time stamp into .DBG file */
WriteExe(&fileInfo.st_atime, sizeof(time_t));
}
OutDebSections(); /* Generate ISLAND sections */
}
#endif
}