d99cfc38c1
INT24 handling. git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@1317 6ac86273-5f31-0410-b378-82cca8765d1b
2071 lines
54 KiB
C
2071 lines
54 KiB
C
/****************************************************************/
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/* */
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/* inthndlr.c */
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/* */
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/* Interrupt Handler and Function dispatcher for Kernel */
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/* */
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/* Copyright (c) 1995 */
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/* Pasquale J. Villani */
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/* All Rights Reserved */
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/* */
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/* This file is part of DOS-C. */
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/* */
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/* DOS-C is free software; you can redistribute it and/or */
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/* modify it under the terms of the GNU General Public License */
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/* as published by the Free Software Foundation; either version */
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/* 2, or (at your option) any later version. */
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/* */
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/* DOS-C is distributed in the hope that it will be useful, but */
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/* WITHOUT ANY WARRANTY; without even the implied warranty of */
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/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See */
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/* the GNU General Public License for more details. */
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/* */
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/* You should have received a copy of the GNU General Public */
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/* License along with DOS-C; see the file COPYING. If not, */
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/* write to the Free Software Foundation, 675 Mass Ave, */
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/* Cambridge, MA 02139, USA. */
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/* */
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/****************************************************************/
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#define MAIN
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#include "portab.h"
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#include "globals.h"
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#include "nls.h"
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#ifdef VERSION_STRINGS
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BYTE *RcsId =
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"$Id$";
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#endif
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#ifdef TSC
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STATIC VOID StartTrace(VOID);
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static bTraceNext = FALSE;
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#endif
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#if 0 /* Very suspicious, passing structure by value??
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Deactivated -- 2000/06/16 ska */
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/* Special entry for far call into the kernel */
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#pragma argsused
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VOID FAR int21_entry(iregs UserRegs)
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{
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int21_handler(UserRegs);
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}
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#endif
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/* Structures needed for int 25 / int 26 */
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struct HugeSectorBlock {
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ULONG blkno;
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WORD nblks;
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BYTE FAR *buf;
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};
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/* Normal entry. This minimizes user stack usage by avoiding local */
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/* variables needed for the rest of the handler. */
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/* this here works on the users stack !! and only very few functions
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are allowed */
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VOID ASMCFUNC int21_syscall(iregs FAR * irp)
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{
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Int21AX = irp->AX;
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switch (irp->AH)
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{
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/* Set Interrupt Vector */
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case 0x25:
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setvec(irp->AL, (intvec)MK_FP(irp->DS, irp->DX));
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break;
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/* DosVars - get/set dos variables */
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case 0x33:
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switch (irp->AL)
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{
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/* Set Ctrl-C flag; returns dl = break_ena */
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case 0x01:
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break_ena = irp->DL & 1;
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/* fall through */
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/* Get Ctrl-C flag */
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case 0x00:
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irp->DL = break_ena;
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break;
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case 0x02: /* andrew schulman: get/set extended control break */
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{
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UBYTE tmp = break_ena;
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break_ena = irp->DL & 1;
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irp->DL = tmp;
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}
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break;
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/* Get Boot Drive */
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case 0x05:
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irp->DL = BootDrive;
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break;
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/* Get (real) DOS-C version */
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case 0x06:
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irp->BL = os_major;
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irp->BH = os_minor;
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irp->DL = rev_number;
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irp->DH = version_flags; /* bit3:runs in ROM,bit 4: runs in HMA */
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break;
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case 0x03: /* DOS 7 does not set AL */
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case 0x07: /* neither here */
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default: /* set AL=0xFF as error, NOT carry */
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irp->AL = 0xff;
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break;
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/* set FreeDOS returned version for int 21.30 from BX */
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case 0xfc: /* 0xfc ... 0xff are FreeDOS extensions */
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os_setver_major = irp->BL;
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os_setver_minor = irp->BH;
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break;
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/* Toggle DOS-C rdwrblock trace dump */
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#ifdef DEBUG
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case 0xfd:
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bDumpRdWrParms = !bDumpRdWrParms;
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break;
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#endif
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/* Toggle DOS-C syscall trace dump */
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#ifdef DEBUG
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case 0xfe:
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bDumpRegs = !bDumpRegs;
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break;
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#endif
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/* Get DOS-C release string pointer */
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case 0xff:
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irp->DX = FP_SEG(os_release);
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irp->AX = FP_OFF(os_release);
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}
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break;
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/* Get Interrupt Vector */
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case 0x35:
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{
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intvec p = getvec(irp->AL);
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irp->ES = FP_SEG(p);
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irp->BX = FP_OFF(p);
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break;
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}
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/* Set PSP */
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case 0x50:
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cu_psp = irp->BX;
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break;
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/* Get PSP */
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case 0x51:
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/* UNDOCUMENTED: return current psp */
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case 0x62:
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irp->BX = cu_psp;
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/* Normal DOS function - DO NOT ARRIVE HERE */
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/* default: */
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}
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}
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#ifdef WITHFAT32
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/* DOS 7.0+ FAT32 extended functions */
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int int21_fat32(lregs *r)
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{
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COUNT rc;
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switch (r->AL)
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{
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/* Get extended drive parameter block */
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case 0x02:
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{
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struct dpb FAR *dpb;
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struct xdpbdata FAR *xddp;
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if (r->CX < sizeof(struct xdpbdata))
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return DE_INVLDBUF;
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dpb = GetDriveDPB(r->DL, &rc);
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if (rc != SUCCESS)
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return rc;
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/* hazard: no error checking! */
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flush_buffers(dpb->dpb_unit);
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dpb->dpb_flags = M_CHANGED; /* force reread of drive BPB/DPB */
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if (media_check(dpb) < 0)
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return DE_INVLDDRV;
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xddp = MK_FP(r->ES, r->DI);
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fmemcpy(&xddp->xdd_dpb, dpb, sizeof(struct dpb));
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xddp->xdd_dpbsize = sizeof(struct dpb);
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/* if it doesn't look like an extended DPB, fill in those fields */
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if (!ISFAT32(dpb) && dpb->dpb_xsize != dpb->dpb_size)
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{
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xddp->xdd_dpb.dpb_nfreeclst_un.dpb_nfreeclst_st.dpb_nfreeclst_hi =
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(dpb->dpb_nfreeclst == 0xFFFF ? 0xFFFF : 0);
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dpb16to32(&xddp->xdd_dpb);
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xddp->xdd_dpb.dpb_xfatsize = dpb->dpb_fatsize;
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xddp->xdd_dpb.dpb_xcluster = (dpb->dpb_cluster == 0xFFFF ?
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0xFFFFFFFFuL : dpb->dpb_cluster);
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}
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break;
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}
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/* Get extended free drive space */
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case 0x03:
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{
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struct xfreespace FAR *xfsp = MK_FP(r->ES, r->DI);
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if (r->CX < sizeof(struct xfreespace))
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return DE_INVLDBUF;
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rc = DosGetExtFree(MK_FP(r->DS, r->DX), xfsp);
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if (rc != SUCCESS)
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return rc;
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xfsp->xfs_datasize = sizeof(struct xfreespace);
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xfsp->xfs_version.actual = 0;
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break;
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}
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/* Set DPB to use for formatting */
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case 0x04:
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{
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struct xdpbforformat FAR *xdffp = MK_FP(r->ES, r->DI);
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struct dpb FAR *dpb;
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if (r->CX < sizeof(struct xdpbforformat))
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{
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return DE_INVLDBUF;
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}
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dpb = GetDriveDPB(r->DL, &rc);
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if (rc != SUCCESS)
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return rc;
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xdffp->xdff_datasize = sizeof(struct xdpbforformat);
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xdffp->xdff_version.actual = 0;
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switch ((UWORD) xdffp->xdff_function)
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{
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case 0x00:
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{
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ULONG nfreeclst = xdffp->xdff_f.setdpbcounts.nfreeclst;
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ULONG cluster = xdffp->xdff_f.setdpbcounts.cluster;
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if (ISFAT32(dpb))
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{
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if ((dpb->dpb_xfsinfosec == 0xffff
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&& (nfreeclst != 0 || cluster != 0))
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|| nfreeclst == 1 || nfreeclst > dpb->dpb_xsize
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|| cluster == 1 || cluster > dpb->dpb_xsize)
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{
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return DE_INVLDPARM;
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}
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dpb->dpb_xnfreeclst = nfreeclst;
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dpb->dpb_xcluster = cluster;
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write_fsinfo(dpb);
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}
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else
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{
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if ((unsigned)nfreeclst == 1 || (unsigned)nfreeclst > dpb->dpb_size ||
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(unsigned)cluster == 1 || (unsigned)cluster > dpb->dpb_size)
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{
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return DE_INVLDPARM;
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}
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dpb->dpb_nfreeclst = (UWORD)nfreeclst;
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dpb->dpb_cluster = (UWORD)cluster;
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}
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break;
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}
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case 0x01:
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{
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ddt *pddt = getddt(r->DL);
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fmemcpy(&pddt->ddt_bpb, xdffp->xdff_f.rebuilddpb.bpbp,
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sizeof(bpb));
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}
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case 0x02:
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{
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rebuild_dpb:
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/* hazard: no error checking! */
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flush_buffers(dpb->dpb_unit);
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dpb->dpb_flags = M_CHANGED;
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if (media_check(dpb) < 0)
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return DE_INVLDDRV;
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break;
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}
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case 0x03:
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{
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struct buffer FAR *bp;
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bpb FAR *bpbp;
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DWORD newmirroring =
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xdffp->xdff_f.setmirroring.newmirroring;
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if (newmirroring != -1
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&& (ISFAT32(dpb)
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&& (newmirroring & ~(0xf | 0x80))))
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{
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return DE_INVLDPARM;
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}
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xdffp->xdff_f.setmirroring.oldmirroring =
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(ISFAT32(dpb) ? dpb->dpb_xflags : 0);
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if (newmirroring != -1 && ISFAT32(dpb))
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{
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bp = getblock(1, dpb->dpb_unit);
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bp->b_flag &= ~(BFR_DATA | BFR_DIR | BFR_FAT);
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bp->b_flag |= BFR_VALID | BFR_DIRTY;
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bpbp = (bpb FAR *) & bp->b_buffer[BT_BPB];
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bpbp->bpb_xflags = (UWORD)newmirroring;
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}
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goto rebuild_dpb;
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}
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case 0x04:
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{
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struct buffer FAR *bp;
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bpb FAR *bpbp;
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DWORD rootclst = xdffp->xdff_f.setroot.newrootclst;
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if (!ISFAT32(dpb)
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|| (rootclst != -1
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&& (rootclst == 1
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|| (ULONG)rootclst > dpb->dpb_xsize)))
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{
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return DE_INVLDPARM;
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}
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xdffp->xdff_f.setroot.oldrootclst = dpb->dpb_xrootclst;
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if (rootclst != -1)
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{
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bp = getblock(1, dpb->dpb_unit);
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bp->b_flag &= ~(BFR_DATA | BFR_DIR | BFR_FAT);
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bp->b_flag |= BFR_VALID | BFR_DIRTY;
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bpbp = (bpb FAR *) & bp->b_buffer[BT_BPB];
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bpbp->bpb_xrootclst = rootclst;
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}
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goto rebuild_dpb;
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}
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}
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break;
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}
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/* Extended absolute disk read/write */
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/* TODO(vlp) consider using of the 13-14th bits of SI */
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case 0x05:
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{
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struct HugeSectorBlock FAR *SectorBlock =
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(struct HugeSectorBlock FAR *)MK_FP(r->DS, r->BX);
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UBYTE mode;
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if (r->CX != 0xffff || ((r->SI & 1) == 0 && r->SI != 0)
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|| (r->SI & ~0x6001))
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{
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return DE_INVLDPARM;
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}
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if (r->DL > lastdrive || r->DL == 0)
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return -0x207;
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if (r->SI == 0)
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mode = DSKREADINT25;
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else
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mode = DSKWRITEINT26;
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r->AX =
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dskxfer(r->DL - 1, SectorBlock->blkno, SectorBlock->buf,
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SectorBlock->nblks, mode);
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if (mode == DSKWRITEINT26)
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if (r->AX == 0)
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setinvld(r->DL - 1);
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if (r->AX > 0)
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return -0x20c;
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break;
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}
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default:
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return DE_INVLDFUNC;
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}
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return SUCCESS;
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}
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#endif
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VOID ASMCFUNC int21_service(iregs FAR * r)
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{
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COUNT rc;
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long lrc;
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lregs lr; /* 8 local registers (ax, bx, cx, dx, si, di, ds, es) */
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#define FP_DS_DX (MK_FP(lr.DS, lr.DX))
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#define FP_ES_DI (MK_FP(lr.ES, lr.DI))
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#define CLEAR_CARRY_FLAG() r->FLAGS &= ~FLG_CARRY
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#define SET_CARRY_FLAG() r->FLAGS |= FLG_CARRY
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((psp FAR *) MK_FP(cu_psp, 0))->ps_stack = (BYTE FAR *) r;
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fmemcpy(&lr, r, sizeof(lregs) - 4);
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lr.DS = r->DS;
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lr.ES = r->ES;
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dispatch:
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#ifdef DEBUG
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if (bDumpRegs)
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{
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fmemcpy(&error_regs, user_r, sizeof(iregs));
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printf("System call (21h): %02x\n", user_r->AX);
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dump_regs = TRUE;
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dump();
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}
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#endif
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|
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if ((lr.AH >= 0x38 && lr.AH <= 0x4F) || (lr.AH >= 0x56 && lr.AH <= 0x5c) ||
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(lr.AH >= 0x5e && lr.AH <= 0x60) || (lr.AH >= 0x65 && lr.AH <= 0x6a) ||
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lr.AH == 0x6c)
|
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{
|
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CLEAR_CARRY_FLAG();
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if (lr.AH != 0x59)
|
|
CritErrCode = SUCCESS;
|
|
}
|
|
/* Clear carry by default for these functions */
|
|
|
|
/* We force clear the near fnodes,
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On a normal int21h entry these are unused, so should already
|
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be clear, thus this code is effectively redundant.
|
|
However when re-entering int21h, such as a device driver
|
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(e.g. shsufdrv), the fnodes may contain the values of the
|
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in progress call; as long as the driver/tsr causing the
|
|
reentrancey saves and restores the SDA across the call then
|
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any changes we do (ie clearing these) should go unnoticed
|
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and if the cause of the reentrancy does not save/restore the
|
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SDA then the caller should expected the unexpected.
|
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Failure to do this will at a minimal result in the extra
|
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output indicating fnodes not 0 (and possibly clearing at end
|
|
of call) when the re-entered int21h call completes, but could
|
|
result in the re-entered call to fail with no free near fnodes
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if both are already in use by the original int21h call (?bug 1879?).
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See also PATCH TE 5 jul 04 explanation at end
|
|
*/
|
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if (/*ErrorMode && */lr.AH > 0x0c && lr.AH != 0x30 && lr.AH != 0x59)
|
|
{
|
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/*if (ErrorMode)*/ ErrorMode = 0;
|
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fnode[0].f_count = 0; /* don't panic - THEY ARE unused !! */
|
|
fnode[1].f_count = 0;
|
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}
|
|
/* Check for Ctrl-Break */
|
|
if (break_ena || (lr.AH >= 1 && lr.AH <= 5) || (lr.AH >= 8 && lr.AH <= 0x0b))
|
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check_handle_break(&syscon);
|
|
|
|
/* The dispatch handler */
|
|
switch (lr.AH)
|
|
{
|
|
/* int 21h common error handler */
|
|
case 0x64:
|
|
goto error_invalid;
|
|
|
|
/* case 0x00: --> Simulate a DOS-4C-00 */
|
|
|
|
/* Read Keyboard with Echo */
|
|
case 0x01:
|
|
DOS_01:
|
|
lr.AL = read_char_stdin(TRUE);
|
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write_char_stdout(lr.AL);
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break;
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|
|
|
/* Display Character */
|
|
case 0x02:
|
|
DOS_02:
|
|
lr.AL = lr.DL;
|
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write_char_stdout(lr.AL);
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break;
|
|
|
|
/* Auxiliary Input */
|
|
case 0x03:
|
|
{
|
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int sft_idx = get_sft_idx(STDAUX);
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lr.AL = read_char(sft_idx, sft_idx, TRUE);
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break;
|
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}
|
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|
|
/* Auxiliary Output */
|
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case 0x04:
|
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write_char(lr.DL, get_sft_idx(STDAUX));
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break;
|
|
/* Print Character */
|
|
case 0x05:
|
|
write_char(lr.DL, get_sft_idx(STDPRN));
|
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break;
|
|
|
|
/* Direct Console I/O */
|
|
case 0x06:
|
|
DOS_06:
|
|
if (lr.DL != 0xff)
|
|
goto DOS_02;
|
|
|
|
lr.AL = 0x00;
|
|
r->FLAGS |= FLG_ZERO;
|
|
if (StdinBusy()) {
|
|
DosIdle_int();
|
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break;
|
|
}
|
|
|
|
r->FLAGS &= ~FLG_ZERO;
|
|
/* fall through */
|
|
|
|
/* Direct Console Input */
|
|
case 0x07:
|
|
DOS_07:
|
|
lr.AL = read_char_stdin(FALSE);
|
|
break;
|
|
|
|
/* Read Keyboard Without Echo */
|
|
case 0x08:
|
|
DOS_08:
|
|
lr.AL = read_char_stdin(TRUE);
|
|
break;
|
|
|
|
/* Display String */
|
|
case 0x09:
|
|
{
|
|
unsigned char c;
|
|
unsigned char FAR *bp = FP_DS_DX;
|
|
|
|
while ((c = *bp++) != '$')
|
|
write_char_stdout(c);
|
|
|
|
lr.AL = c;
|
|
}
|
|
break;
|
|
|
|
/* Buffered Keyboard Input */
|
|
case 0x0a:
|
|
DOS_0A:
|
|
read_line(get_sft_idx(STDIN), get_sft_idx(STDOUT), FP_DS_DX);
|
|
break;
|
|
|
|
/* Check Stdin Status */
|
|
case 0x0b:
|
|
lr.AL = 0xFF;
|
|
if (StdinBusy())
|
|
lr.AL = 0x00;
|
|
break;
|
|
|
|
/* Flush Buffer, Read Keyboard */
|
|
case 0x0c:
|
|
{
|
|
struct dhdr FAR *dev = sft_to_dev(get_sft(STDIN));
|
|
if (dev)
|
|
con_flush(&dev);
|
|
switch (lr.AL)
|
|
{
|
|
case 0x01: goto DOS_01;
|
|
case 0x06: goto DOS_06;
|
|
case 0x07: goto DOS_07;
|
|
case 0x08: goto DOS_08;
|
|
case 0x0a: goto DOS_0A;
|
|
}
|
|
lr.AL = 0x00;
|
|
break;
|
|
}
|
|
|
|
/* Reset Drive */
|
|
case 0x0d:
|
|
flush();
|
|
break;
|
|
|
|
/* Set Default Drive */
|
|
case 0x0e:
|
|
lr.AL = DosSelectDrv(lr.DL);
|
|
break;
|
|
|
|
case 0x0f:
|
|
lr.AL = FcbOpen(FP_DS_DX, O_FCB | O_LEGACY | O_OPEN | O_RDWR);
|
|
break;
|
|
|
|
case 0x10:
|
|
lr.AL = FcbClose(FP_DS_DX);
|
|
break;
|
|
|
|
case 0x11:
|
|
lr.AL = FcbFindFirstNext(FP_DS_DX, TRUE);
|
|
break;
|
|
|
|
case 0x12:
|
|
lr.AL = FcbFindFirstNext(FP_DS_DX, FALSE);
|
|
break;
|
|
|
|
case 0x13:
|
|
lr.AL = FcbDelete(FP_DS_DX);
|
|
break;
|
|
|
|
case 0x14:
|
|
/* FCB read */
|
|
lr.AL = FcbReadWrite(FP_DS_DX, 1, XFR_READ);
|
|
break;
|
|
|
|
case 0x15:
|
|
/* FCB write */
|
|
lr.AL = FcbReadWrite(FP_DS_DX, 1, XFR_WRITE);
|
|
break;
|
|
|
|
case 0x16:
|
|
lr.AL = FcbOpen(FP_DS_DX, O_FCB | O_LEGACY | O_CREAT | O_TRUNC | O_RDWR);
|
|
break;
|
|
|
|
case 0x17:
|
|
lr.AL = FcbRename(FP_DS_DX);
|
|
break;
|
|
|
|
default:
|
|
#ifdef DEBUG
|
|
printf("Unsupported INT21 AH = 0x%x, AL = 0x%x.\n", lr.AH, lr.AL);
|
|
#endif
|
|
/* Fall through. */
|
|
|
|
/* CP/M compatibility functions */
|
|
case 0x18:
|
|
case 0x1d:
|
|
case 0x1e:
|
|
case 0x20:
|
|
#ifndef TSC
|
|
case 0x61:
|
|
#endif
|
|
case 0x6b:
|
|
lr.AL = 0;
|
|
break;
|
|
|
|
/* Get Default Drive */
|
|
case 0x19:
|
|
lr.AL = default_drive;
|
|
break;
|
|
|
|
/* Set DTA */
|
|
case 0x1a:
|
|
dta = FP_DS_DX;
|
|
break;
|
|
|
|
/* Get Default Drive Data */
|
|
case 0x1b:
|
|
lr.DL = 0;
|
|
/* fall through */
|
|
|
|
/* Get Drive Data */
|
|
case 0x1c:
|
|
{
|
|
BYTE FAR *p;
|
|
|
|
p = FatGetDrvData(lr.DL, &lr.AL, &lr.CX, &lr.DX);
|
|
lr.DS = FP_SEG(p);
|
|
lr.BX = FP_OFF(p);
|
|
}
|
|
break;
|
|
|
|
/* Get default DPB */
|
|
/* case 0x1f: see case 0x32 */
|
|
|
|
/* Random read using FCB: fields not updated
|
|
(XFR_RANDOM should not be used here) */
|
|
case 0x21:
|
|
lr.AL = FcbRandomIO(FP_DS_DX, XFR_READ);
|
|
break;
|
|
|
|
/* Random write using FCB */
|
|
case 0x22:
|
|
lr.AL = FcbRandomIO(FP_DS_DX, XFR_WRITE);
|
|
break;
|
|
|
|
/* Get file size in records using FCB */
|
|
case 0x23:
|
|
lr.AL = FcbGetFileSize(FP_DS_DX);
|
|
break;
|
|
|
|
/* Set random record field in FCB */
|
|
case 0x24:
|
|
FcbSetRandom(FP_DS_DX);
|
|
break;
|
|
|
|
/* Set Interrupt Vector */
|
|
/* case 0x25: handled above (re-entrant) */
|
|
|
|
/* Dos Create New Psp */
|
|
case 0x26:
|
|
new_psp(lr.DX, r->CS);
|
|
break;
|
|
|
|
/* Read random record(s) using FCB */
|
|
case 0x27:
|
|
lr.AL = FcbRandomBlockIO(FP_DS_DX, &lr.CX, XFR_READ | XFR_FCB_RANDOM);
|
|
break;
|
|
|
|
/* Write random record(s) using FCB */
|
|
case 0x28:
|
|
lr.AL = FcbRandomBlockIO(FP_DS_DX, &lr.CX, XFR_WRITE | XFR_FCB_RANDOM);
|
|
break;
|
|
|
|
/* Parse File Name */
|
|
case 0x29:
|
|
lr.SI = FcbParseFname(&lr.AL, MK_FP(lr.DS, lr.SI), FP_ES_DI);
|
|
break;
|
|
|
|
/* Get Date */
|
|
case 0x2a:
|
|
lr.AL = DosGetDate((struct dosdate *)&lr.CX);
|
|
break;
|
|
|
|
/* Set Date */
|
|
case 0x2b:
|
|
lr.AL = DosSetDate ((struct dosdate*)&lr.CX) == SUCCESS ? 0 : 0xFF;
|
|
break;
|
|
|
|
/* Get Time */
|
|
case 0x2c:
|
|
DosGetTime((struct dostime *)&lr.CL);
|
|
break;
|
|
|
|
/* Set Time */
|
|
case 0x2d:
|
|
lr.AL = DosSetTime ((struct dostime*)&lr.CX) == SUCCESS ? 0 : 0xFF;
|
|
break;
|
|
|
|
/* Set verify flag */
|
|
case 0x2e:
|
|
verify_ena = lr.AL & 1;
|
|
break;
|
|
|
|
/* Get DTA */
|
|
case 0x2f:
|
|
lr.BX = FP_OFF(dta);
|
|
lr.ES = FP_SEG(dta);
|
|
break;
|
|
|
|
/* Get (editable) DOS Version */
|
|
case 0x30:
|
|
lr.AL = os_setver_major;
|
|
lr.AH = os_setver_minor;
|
|
lr.BH = OEM_ID;
|
|
lr.BL = REVISION_SEQ;
|
|
lr.CX = 0; /* do not set this to a serial number!
|
|
32RTM won't like non-zero values */
|
|
|
|
if (ReturnAnyDosVersionExpected)
|
|
{
|
|
/* TE for testing purpose only and NOT
|
|
to be documented:
|
|
return programs, who ask for version == XX.YY
|
|
exactly this XX.YY.
|
|
this makes most MS programs more happy.
|
|
*/
|
|
UBYTE FAR *retp = MK_FP(r->cs, r->ip);
|
|
|
|
if (retp[0] == 0x3d && /* cmp ax, xxyy */
|
|
(retp[3] == 0x75 || retp[3] == 0x74)) /* je/jne error */
|
|
{
|
|
lr.AL = retp[1];
|
|
lr.AH = retp[2];
|
|
}
|
|
else if (retp[0] == 0x86 && /* xchg al,ah */
|
|
retp[1] == 0xc4 && retp[2] == 0x3d && /* cmp ax, xxyy */
|
|
(retp[5] == 0x75 || retp[5] == 0x74)) /* je/jne error */
|
|
{
|
|
lr.AL = retp[4];
|
|
lr.AH = retp[3];
|
|
}
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
/* Keep Program (Terminate and stay resident) */
|
|
case 0x31:
|
|
DosMemChange(cu_psp, lr.DX < 6 ? 6 : lr.DX, 0);
|
|
return_code = lr.AL | 0x300;
|
|
tsr = TRUE;
|
|
return_user();
|
|
break;
|
|
|
|
/* Get default BPB */
|
|
case 0x1f:
|
|
/* Get DPB */
|
|
case 0x32:
|
|
/* r->DL is NOT changed by MS 6.22 */
|
|
/* INT21/32 is documented to reread the DPB */
|
|
{
|
|
int drv = (lr.DL == 0 || lr.AH == 0x1f) ? default_drive : lr.DL - 1;
|
|
struct dpb FAR *dpb = get_dpb(drv);
|
|
|
|
if (dpb == NULL)
|
|
{
|
|
CritErrCode = -DE_INVLDDRV;
|
|
lr.AL = 0xFF;
|
|
break;
|
|
}
|
|
/* hazard: no error checking! */
|
|
flush_buffers(dpb->dpb_unit);
|
|
dpb->dpb_flags = M_CHANGED; /* force flush and reread of drive BPB/DPB */
|
|
|
|
#ifdef WITHFAT32
|
|
if (media_check(dpb) < 0 || ISFAT32(dpb))
|
|
#else
|
|
if (media_check(dpb) < 0)
|
|
#endif
|
|
{
|
|
lr.AL = 0xff;
|
|
CritErrCode = -DE_INVLDDRV;
|
|
break;
|
|
}
|
|
lr.DS = FP_SEG(dpb);
|
|
lr.BX = FP_OFF(dpb);
|
|
lr.AL = 0;
|
|
}
|
|
|
|
break;
|
|
/*
|
|
case 0x33:
|
|
see int21_syscall
|
|
*/
|
|
/* Get InDOS flag */
|
|
case 0x34:
|
|
lr.BX = FP_OFF(&InDOS);
|
|
lr.ES = FP_SEG(&InDOS);
|
|
break;
|
|
|
|
/* Get Interrupt Vector */
|
|
/* case 0x35: handled above (reentrant) */
|
|
|
|
/* Dos Get Disk Free Space */
|
|
case 0x36:
|
|
lr.AX = DosGetFree(lr.DL, &lr.BX, &lr.CX, &lr.DX);
|
|
break;
|
|
|
|
/* Undocumented Get/Set Switchar */
|
|
case 0x37:
|
|
switch (lr.AL)
|
|
{
|
|
/* Get switch character */
|
|
case 0x00:
|
|
lr.DL = switchar;
|
|
lr.AL = 0x00;
|
|
break;
|
|
|
|
/* Set switch character */
|
|
case 0x01:
|
|
switchar = lr.DL;
|
|
lr.AL = 0x00;
|
|
break;
|
|
|
|
default:
|
|
goto error_invalid;
|
|
}
|
|
break;
|
|
|
|
/* Get/Set Country Info */
|
|
case 0x38:
|
|
{
|
|
UWORD cntry = lr.AL;
|
|
|
|
if (cntry == 0xff)
|
|
cntry = lr.BX;
|
|
|
|
if (0xffff == lr.DX)
|
|
{
|
|
/* Set Country Code */
|
|
rc = DosSetCountry(cntry);
|
|
}
|
|
else
|
|
{
|
|
if (cntry == 0)
|
|
cntry--;
|
|
/* Get Country Information */
|
|
rc = DosGetCountryInformation(cntry, FP_DS_DX);
|
|
if (rc >= SUCCESS)
|
|
{
|
|
/* HACK FIXME */
|
|
if (cntry == (UWORD) - 1)
|
|
cntry = 1;
|
|
/* END OF HACK */
|
|
lr.AX = lr.BX = cntry;
|
|
}
|
|
}
|
|
goto short_check;
|
|
}
|
|
|
|
/* Dos Create Directory */
|
|
case 0x39:
|
|
/* Dos Remove Directory */
|
|
case 0x3a:
|
|
rc = DosMkRmdir(FP_DS_DX, lr.AH);
|
|
goto short_check;
|
|
|
|
/* Dos Change Directory */
|
|
case 0x3b:
|
|
rc = DosChangeDir(FP_DS_DX);
|
|
goto short_check;
|
|
|
|
/* Dos Create File */
|
|
case 0x3c:
|
|
lrc = DosOpen(FP_DS_DX, O_LEGACY | O_RDWR | O_CREAT | O_TRUNC, lr.CL);
|
|
goto long_check;
|
|
|
|
/* Dos Open */
|
|
case 0x3d:
|
|
lrc = DosOpen(FP_DS_DX, O_LEGACY | O_OPEN | lr.AL, 0);
|
|
goto long_check;
|
|
|
|
/* Dos Close */
|
|
case 0x3e:
|
|
rc = DosClose(lr.BX);
|
|
goto short_check;
|
|
|
|
/* Dos Read */
|
|
case 0x3f:
|
|
lrc = DosRead(lr.BX, lr.CX, FP_DS_DX);
|
|
goto long_check;
|
|
|
|
/* Dos Write */
|
|
case 0x40:
|
|
lrc = DosWrite(lr.BX, lr.CX, FP_DS_DX);
|
|
goto long_check;
|
|
|
|
/* Dos Delete File */
|
|
case 0x41:
|
|
rc = DosDelete((BYTE FAR *) FP_DS_DX, D_ALL);
|
|
goto short_check;
|
|
|
|
/* Dos Seek */
|
|
case 0x42:
|
|
if (lr.AL > 2)
|
|
goto error_invalid;
|
|
lrc = DosSeek(lr.BX, (LONG)((((ULONG) (lr.CX)) << 16) | lr.DX), lr.AL);
|
|
if (lrc == -1)
|
|
{
|
|
lrc = DE_INVLDHNDL;
|
|
}
|
|
else
|
|
{
|
|
lr.DX = (UWORD)(lrc >> 16);
|
|
lrc = (UWORD) lrc;
|
|
}
|
|
goto long_check;
|
|
|
|
/* Get/Set File Attributes */
|
|
case 0x43:
|
|
switch (lr.AL)
|
|
{
|
|
case 0x00:
|
|
rc = DosGetFattr((BYTE FAR *) FP_DS_DX);
|
|
if (rc >= SUCCESS)
|
|
lr.CX = rc;
|
|
break;
|
|
|
|
case 0x01:
|
|
rc = DosSetFattr((BYTE FAR *) FP_DS_DX, lr.CX);
|
|
lr.AX = lr.CX;
|
|
break;
|
|
|
|
default:
|
|
goto error_invalid;
|
|
}
|
|
goto short_check;
|
|
|
|
/* Device I/O Control */
|
|
case 0x44:
|
|
rc = DosDevIOctl(&lr); /* can set critical error code! */
|
|
|
|
if (rc < SUCCESS)
|
|
{
|
|
lr.AX = -rc;
|
|
if (rc != DE_DEVICE && rc != DE_ACCESS)
|
|
CritErrCode = lr.AX;
|
|
goto error_carry;
|
|
}
|
|
break;
|
|
|
|
/* Duplicate File Handle */
|
|
case 0x45:
|
|
lrc = DosDup(lr.BX);
|
|
goto long_check;
|
|
|
|
/* Force Duplicate File Handle */
|
|
case 0x46:
|
|
rc = DosForceDup(lr.BX, lr.CX);
|
|
goto short_check;
|
|
|
|
/* Get Current Directory */
|
|
case 0x47:
|
|
rc = DosGetCuDir(lr.DL, MK_FP(lr.DS, lr.SI));
|
|
lr.AX = 0x0100; /*jpp: from interrupt list */
|
|
goto short_check;
|
|
|
|
/* Allocate memory */
|
|
case 0x48:
|
|
if ((rc = DosMemAlloc(lr.BX, mem_access_mode, &lr.AX, &lr.BX)) < 0)
|
|
{
|
|
DosMemLargest(&lr.BX);
|
|
if (DosMemCheck() != SUCCESS)
|
|
panic("MCB chain corrupted");
|
|
goto error_exit;
|
|
}
|
|
lr.AX++; /* DosMemAlloc() returns seg of MCB rather than data */
|
|
break;
|
|
|
|
/* Free memory */
|
|
case 0x49:
|
|
if ((rc = DosMemFree(lr.ES - 1)) < SUCCESS)
|
|
{
|
|
if (DosMemCheck() != SUCCESS)
|
|
panic("MCB chain corrupted");
|
|
goto error_exit;
|
|
}
|
|
break;
|
|
|
|
/* Set memory block size */
|
|
case 0x4a:
|
|
if (DosMemCheck() != SUCCESS)
|
|
panic("before 4a: MCB chain corrupted");
|
|
|
|
if ((rc = DosMemChange(lr.ES, lr.BX, &lr.BX)) < 0)
|
|
{
|
|
#if 0
|
|
if (cu_psp == lr.ES)
|
|
{
|
|
psp FAR *p = MK_FP(cu_psp, 0);
|
|
p->ps_size = lr.BX + cu_psp;
|
|
}
|
|
#endif
|
|
if (DosMemCheck() != SUCCESS)
|
|
panic("after 4a: MCB chain corrupted");
|
|
goto error_exit;
|
|
}
|
|
lr.AX = lr.ES; /* Undocumented MS-DOS behaviour expected by BRUN45! */
|
|
break;
|
|
|
|
/* Load and Execute Program */
|
|
case 0x4b:
|
|
break_flg = FALSE;
|
|
|
|
rc = DosExec(lr.AL, MK_FP(lr.ES, lr.BX), FP_DS_DX);
|
|
goto short_check;
|
|
|
|
/* Terminate Program */
|
|
case 0x00:
|
|
lr.AX = 0x4c00;
|
|
|
|
/* End Program */
|
|
case 0x4c:
|
|
if (((psp FAR *)MK_FP(cu_psp, 0))->ps_parent == cu_psp)
|
|
break;
|
|
tsr = FALSE;
|
|
rc = 0;
|
|
if (ErrorMode)
|
|
{
|
|
ErrorMode = FALSE;
|
|
rc = 0x200;
|
|
}
|
|
else if (break_flg)
|
|
{
|
|
break_flg = FALSE;
|
|
rc = 0x100;
|
|
}
|
|
return_code = lr.AL | rc;
|
|
if (DosMemCheck() != SUCCESS)
|
|
panic("MCB chain corrupted");
|
|
#ifdef TSC
|
|
StartTrace();
|
|
#endif
|
|
return_user();
|
|
break;
|
|
|
|
/* Get Child-program Return Value */
|
|
case 0x4d:
|
|
lr.AX = return_code;
|
|
/* needs to be cleared (RBIL) */
|
|
return_code = 0;
|
|
break;
|
|
|
|
/* Dos Find First */
|
|
case 0x4e:
|
|
/* dta for this call is set on entry. This */
|
|
/* needs to be changed for new versions. */
|
|
rc = DosFindFirst(lr.CX, FP_DS_DX);
|
|
lr.AX = 0;
|
|
goto short_check;
|
|
|
|
/* Dos Find Next */
|
|
case 0x4f:
|
|
/* dta for this call is set on entry. This */
|
|
/* needs to be changed for new versions. */
|
|
rc = DosFindNext();
|
|
lr.AX = 0;
|
|
goto short_check;
|
|
/*
|
|
case 0x50:
|
|
case 0x51:
|
|
see int21_syscall
|
|
*/
|
|
/* ************UNDOCUMENTED************************************* */
|
|
/* Get List of Lists */
|
|
case 0x52:
|
|
lr.BX = FP_OFF(&DPBp);
|
|
lr.ES = FP_SEG(&DPBp);
|
|
break;
|
|
|
|
case 0x53:
|
|
/* DOS 2+ internal - TRANSLATE BIOS PARAMETER BLOCK TO DRIVE PARAM BLOCK */
|
|
bpb_to_dpb((bpb FAR *) MK_FP(lr.DS, lr.SI),
|
|
(struct dpb FAR *)MK_FP(lr.ES, r->BP)
|
|
#ifdef WITHFAT32
|
|
, (lr.CX == 0x4558 && lr.DX == 0x4152)
|
|
#endif
|
|
);
|
|
break;
|
|
|
|
/* Get verify state */
|
|
case 0x54:
|
|
lr.AL = verify_ena;
|
|
break;
|
|
|
|
/* ************UNDOCUMENTED************************************* */
|
|
/* Dos Create New Psp & set p_size */
|
|
case 0x55:
|
|
child_psp(lr.DX, cu_psp, lr.SI);
|
|
cu_psp = lr.DX;
|
|
break;
|
|
|
|
/* Dos Rename */
|
|
case 0x56:
|
|
rc = DosRename(FP_DS_DX, FP_ES_DI);
|
|
goto short_check;
|
|
|
|
/* Get/Set File Date and Time */
|
|
case 0x57:
|
|
switch (lr.AL)
|
|
{
|
|
case 0x00:
|
|
rc = DosGetFtime((COUNT) lr.BX, /* Handle */
|
|
&lr.DX, /* FileDate */
|
|
&lr.CX); /* FileTime */
|
|
break;
|
|
|
|
case 0x01:
|
|
rc = DosSetFtime((COUNT) lr.BX, /* Handle */
|
|
(date) lr.DX, /* FileDate */
|
|
(time) lr.CX); /* FileTime */
|
|
break;
|
|
|
|
default:
|
|
goto error_invalid;
|
|
}
|
|
goto short_check;
|
|
|
|
/* Get/Set Allocation Strategy */
|
|
case 0x58:
|
|
switch (lr.AL)
|
|
{
|
|
case 0x00:
|
|
lr.AL = mem_access_mode;
|
|
lr.AH = 0;
|
|
break;
|
|
|
|
case 0x01:
|
|
if (lr.BL > LAST_FIT_U || /* 0x82 */
|
|
(lr.BL & FIT_MASK) > LAST_FIT) /* 0x3f, 0x02 */
|
|
goto error_invalid;
|
|
mem_access_mode = lr.BL;
|
|
break;
|
|
|
|
case 0x02:
|
|
lr.AL = uppermem_link;
|
|
break;
|
|
|
|
case 0x03:
|
|
if (uppermem_root != 0xffff) /* always error if not exists */
|
|
{
|
|
DosUmbLink(lr.BX);
|
|
break;
|
|
}
|
|
/* else fall through */
|
|
|
|
default:
|
|
goto error_invalid;
|
|
#ifdef DEBUG
|
|
case 0xff:
|
|
show_chain();
|
|
break;
|
|
#endif
|
|
}
|
|
break;
|
|
|
|
/* Get Extended Error */
|
|
case 0x59:
|
|
lr.AX = CritErrCode;
|
|
lr.CH = CritErrLocus;
|
|
lr.BH = CritErrClass;
|
|
lr.BL = CritErrAction;
|
|
lr.DI = FP_OFF(CritErrDev);
|
|
lr.ES = FP_SEG(CritErrDev);
|
|
break;
|
|
|
|
/* Create Temporary File */
|
|
case 0x5a:
|
|
lrc = DosMkTmp(FP_DS_DX, lr.CX);
|
|
goto long_check;
|
|
|
|
/* Create New File */
|
|
case 0x5b:
|
|
lrc = DosOpen(FP_DS_DX, O_LEGACY | O_RDWR | O_CREAT, lr.CX);
|
|
goto long_check;
|
|
|
|
/* /// Added for SHARE. - Ron Cemer */
|
|
/* Lock/unlock file access */
|
|
case 0x5c:
|
|
rc = DosLockUnlock
|
|
(lr.BX, ((unsigned long)lr.CX << 16) | lr.DX,
|
|
((unsigned long)lr.SI << 16) | lr.DI, lr.AL != 0);
|
|
if (rc != SUCCESS)
|
|
goto error_exit;
|
|
break;
|
|
/* /// End of additions for SHARE. - Ron Cemer */
|
|
|
|
/* UNDOCUMENTED: server, share.exe and sda function */
|
|
case 0x5d:
|
|
switch (lr.AL)
|
|
{
|
|
/* Remote Server Call */
|
|
case 0x00:
|
|
fmemcpy(&lr, FP_DS_DX, sizeof(lr));
|
|
goto dispatch;
|
|
|
|
case 0x06:
|
|
lr.DS = FP_SEG(internal_data);
|
|
lr.SI = FP_OFF(internal_data);
|
|
lr.CX = swap_indos - internal_data;
|
|
lr.DX = swap_always - internal_data;
|
|
CLEAR_CARRY_FLAG();
|
|
break;
|
|
|
|
case 0x07:
|
|
case 0x08:
|
|
case 0x09:
|
|
rc = remote_printredir(lr.DX, Int21AX);
|
|
CLEAR_CARRY_FLAG();
|
|
if (rc != SUCCESS)
|
|
goto error_exit;
|
|
break;
|
|
|
|
/* Set Extended Error */
|
|
case 0x0a:
|
|
{
|
|
lregs far *er = FP_DS_DX;
|
|
CritErrCode = er->AX;
|
|
CritErrDev = MK_FP(er->ES, er->DI);
|
|
CritErrLocus = er->CH;
|
|
CritErrClass = er->BH;
|
|
CritErrAction = er->BL;
|
|
CLEAR_CARRY_FLAG();
|
|
break;
|
|
}
|
|
|
|
default:
|
|
CritErrCode = SUCCESS;
|
|
goto error_invalid;
|
|
}
|
|
break;
|
|
|
|
case 0x5e:
|
|
switch (lr.AL)
|
|
{
|
|
case 0x00:
|
|
lr.CX = get_machine_name(FP_DS_DX);
|
|
break;
|
|
|
|
case 0x01:
|
|
set_machine_name(FP_DS_DX, lr.CX);
|
|
break;
|
|
|
|
default:
|
|
rc = (int)network_redirector_mx(REM_PRINTSET, &lr, (void *)Int21AX);
|
|
goto short_check;
|
|
}
|
|
break;
|
|
|
|
case 0x5f:
|
|
if (lr.AL == 7 || lr.AL == 8)
|
|
{
|
|
if (lr.DL < lastdrive)
|
|
{
|
|
struct cds FAR *cdsp = CDSp + lr.DL;
|
|
if (FP_OFF(cdsp->cdsDpb)) /* letter of physical drive? */
|
|
{
|
|
cdsp->cdsFlags &= ~CDSPHYSDRV;
|
|
if (lr.AL == 7)
|
|
cdsp->cdsFlags |= CDSPHYSDRV;
|
|
break;
|
|
}
|
|
}
|
|
rc = DE_INVLDDRV;
|
|
goto error_exit;
|
|
}
|
|
else
|
|
{
|
|
rc = (int)network_redirector_mx(REM_DOREDIRECT, &lr, (void *)Int21AX);
|
|
/* the remote function manipulates *r directly !,
|
|
so we should not copy lr to r here */
|
|
if (rc != SUCCESS)
|
|
{
|
|
CritErrCode = -rc; /* Maybe set */
|
|
SET_CARRY_FLAG();
|
|
}
|
|
r->AX = -rc;
|
|
goto real_exit;
|
|
}
|
|
|
|
case 0x60: /* TRUENAME */
|
|
rc = DosTruename(MK_FP(lr.DS, lr.SI), adjust_far(FP_ES_DI));
|
|
goto short_check;
|
|
|
|
#ifdef TSC
|
|
/* UNDOCUMENTED: no-op */
|
|
/* */
|
|
/* DOS-C: tsc support */
|
|
case 0x61:
|
|
#ifdef DEBUG
|
|
switch (lr.AL)
|
|
{
|
|
case 0x01:
|
|
bTraceNext = TRUE;
|
|
break;
|
|
|
|
case 0x02:
|
|
bDumpRegs = FALSE;
|
|
break;
|
|
}
|
|
#endif
|
|
lr.AL = 0x00;
|
|
break;
|
|
#endif
|
|
|
|
/* UNDOCUMENTED: return current psp
|
|
case 0x62: is in int21_syscall
|
|
lr.BX = cu_psp;
|
|
break;
|
|
*/
|
|
|
|
/* UNDOCUMENTED: Double byte and korean tables */
|
|
case 0x63:
|
|
{
|
|
#if 0
|
|
/* not really supported, but will pass. */
|
|
lr.AL = 0x00; /*jpp: according to interrupt list */
|
|
/*Bart: fails for PQDI and WATCOM utilities:
|
|
use the above again */
|
|
#endif
|
|
switch (lr.AL)
|
|
{
|
|
case 0:
|
|
lr.DS = FP_SEG(&nlsDBCSHardcoded);
|
|
lr.SI = FP_OFF(&nlsDBCSHardcoded);
|
|
break;
|
|
case 1: /* set Korean Hangul input method to DL 0/1 */
|
|
lr.AL = 0xff; /* flag error (AL would be 0 if okay) */
|
|
break;
|
|
case 2: /* get Korean Hangul input method setting to DL */
|
|
lr.AL = 0xff; /* flag error, do not set DL */
|
|
break;
|
|
default: /* is this the proper way to handle invalid AL? */
|
|
rc = -1;
|
|
goto error_exit;
|
|
}
|
|
break;
|
|
}
|
|
/*
|
|
case 0x64:
|
|
see above (invalid)
|
|
*/
|
|
|
|
/* Extended country info */
|
|
case 0x65:
|
|
switch (lr.AL)
|
|
{
|
|
case 0x20: /* upcase single character */
|
|
lr.DL = DosUpChar(lr.DL);
|
|
break;
|
|
case 0x21: /* upcase memory area */
|
|
DosUpMem(FP_DS_DX, lr.CX);
|
|
break;
|
|
case 0x22: /* upcase ASCIZ */
|
|
DosUpString(FP_DS_DX);
|
|
break;
|
|
case 0xA0: /* upcase single character of filenames */
|
|
lr.DL = DosUpFChar(lr.DL);
|
|
break;
|
|
case 0xA1: /* upcase memory area of filenames */
|
|
DosUpFMem(FP_DS_DX, lr.CX);
|
|
break;
|
|
case 0xA2: /* upcase ASCIZ of filenames */
|
|
DosUpFString(FP_DS_DX);
|
|
break;
|
|
case 0x23: /* check Yes/No response */
|
|
lr.AX = DosYesNo(lr.DL);
|
|
break;
|
|
default:
|
|
#ifdef NLS_DEBUG
|
|
if ((rc = DosGetData(lr.AL, lr.BX, lr.DX, lr.CX, FP_ES_DI)) < 0)
|
|
{
|
|
printf("DosGetData() := %d\n", rc);
|
|
goto error_exit;
|
|
}
|
|
printf("DosGetData() returned successfully\n");
|
|
break;
|
|
#else
|
|
rc = DosGetData(lr.AL, lr.BX, lr.DX, lr.CX, FP_ES_DI);
|
|
goto short_check;
|
|
#endif
|
|
}
|
|
break;
|
|
|
|
/* Code Page functions */
|
|
case 0x66:
|
|
switch (lr.AL)
|
|
{
|
|
case 1:
|
|
rc = DosGetCodepage(&lr.BX, &lr.DX);
|
|
break;
|
|
case 2:
|
|
rc = DosSetCodepage(lr.BX, lr.DX);
|
|
break;
|
|
|
|
default:
|
|
goto error_invalid;
|
|
}
|
|
if (rc != SUCCESS)
|
|
goto error_exit;
|
|
break;
|
|
|
|
/* Set Max file handle count */
|
|
case 0x67:
|
|
rc = SetJFTSize(lr.BX);
|
|
goto short_check;
|
|
|
|
/* Flush file buffer -- COMMIT FILE. */
|
|
case 0x68:
|
|
case 0x6a:
|
|
rc = DosCommit(lr.BX);
|
|
goto short_check;
|
|
|
|
/* Get/Set Serial Number */
|
|
case 0x69:
|
|
rc = (lr.BL == 0 ? default_drive : lr.BL - 1);
|
|
if (lr.AL < 2)
|
|
{
|
|
if (get_cds(rc) == NULL)
|
|
{
|
|
rc = DE_INVLDDRV;
|
|
goto error_exit;
|
|
}
|
|
if (get_dpb(rc) != NULL)
|
|
{
|
|
UWORD saveCX = lr.CX;
|
|
lr.CX = lr.AL == 0 ? 0x0866 : 0x0846;
|
|
lr.AL = 0x0d;
|
|
rc = DosDevIOctl(&lr);
|
|
lr.CX = saveCX;
|
|
goto short_check;
|
|
}
|
|
}
|
|
goto error_invalid;
|
|
/*
|
|
case 0x6a: see case 0x68
|
|
case 0x6b: dummy func: return AL=0
|
|
*/
|
|
/* Extended Open-Creat, not fully functional. (bits 4,5,6 of BH) */
|
|
case 0x6c:
|
|
/* high nibble must be <= 1, low nibble must be <= 2 */
|
|
if ((lr.DL & 0xef) > 0x2)
|
|
goto error_invalid;
|
|
lrc = DosOpen(MK_FP(lr.DS, lr.SI),
|
|
(lr.BX & 0x70ff) | ((lr.DL & 3) << 8) |
|
|
((lr.DL & 0x10) << 6), lr.CL);
|
|
if (lrc >= SUCCESS)
|
|
/* action */
|
|
lr.CX = (UWORD)(lrc >> 16);
|
|
goto long_check;
|
|
|
|
/* case 0x6d and above not implemented : see default; return AL=0 */
|
|
|
|
#ifdef WITHFAT32
|
|
/* LFN functions - fail with "function not supported" error code */
|
|
case 0x71:
|
|
lr.AL = 00;
|
|
goto error_carry;
|
|
|
|
/* DOS 7.0+ FAT32 extended functions */
|
|
case 0x73:
|
|
CLEAR_CARRY_FLAG();
|
|
CritErrCode = SUCCESS;
|
|
rc = int21_fat32(&lr);
|
|
goto short_check;
|
|
#endif
|
|
|
|
#ifdef WITHLFNAPI
|
|
/* FreeDOS LFN helper API functions */
|
|
case 0x74:
|
|
{
|
|
switch (lr.AL)
|
|
{
|
|
/* Allocate LFN inode */
|
|
case 0x01:
|
|
rc = lfn_allocate_inode();
|
|
break;
|
|
/* Free LFN inode */
|
|
case 0x02:
|
|
rc = lfn_free_inode(lr.BX);
|
|
break;
|
|
/* Setup LFN inode */
|
|
case 0x03:
|
|
rc = lfn_setup_inode(lr.BX, ((ULONG)lr.CX << 16) | lr.DX, ((ULONG)lr.SI << 16) | lr.DI);
|
|
break;
|
|
/* Create LFN entries */
|
|
case 0x04:
|
|
rc = lfn_create_entries(lr.BX, (lfn_inode_ptr)FP_DS_DX);
|
|
break;
|
|
/* Read next LFN */
|
|
case 0x05:
|
|
rc = lfn_dir_read(lr.BX, (lfn_inode_ptr)FP_DS_DX);
|
|
break;
|
|
/* Write SFN pointed by LFN inode */
|
|
case 0x06:
|
|
rc = lfn_dir_write(lr.BX);
|
|
break;
|
|
default:
|
|
goto error_invalid;
|
|
}
|
|
lr.AX = rc;
|
|
CLEAR_CARRY_FLAG();
|
|
goto short_check;
|
|
}
|
|
#endif
|
|
}
|
|
goto exit_dispatch;
|
|
long_check:
|
|
if (lrc >= SUCCESS)
|
|
{
|
|
lr.AX = (UWORD)lrc;
|
|
goto exit_dispatch;
|
|
}
|
|
rc = (int)lrc;
|
|
short_check:
|
|
if (rc < SUCCESS)
|
|
goto error_exit;
|
|
goto exit_dispatch;
|
|
error_invalid:
|
|
rc = DE_INVLDFUNC;
|
|
error_exit:
|
|
lr.AX = -rc;
|
|
if (CritErrCode == SUCCESS)
|
|
CritErrCode = lr.AX; /* Maybe set */
|
|
error_carry:
|
|
SET_CARRY_FLAG();
|
|
exit_dispatch:
|
|
fmemcpy(r, &lr, sizeof(lregs) - 4);
|
|
r->DS = lr.DS;
|
|
r->ES = lr.ES;
|
|
real_exit:;
|
|
|
|
/* PATCH !! TE 5 JUL 04
|
|
what happened:
|
|
Application does FindFirst("I:\*.*");
|
|
this fails, and causes Int24
|
|
this sets ErrorMode, and calls Int24
|
|
Application decides NOT to return to DOS,
|
|
but instead pop the stack and return to itself
|
|
(this is legal; see RBIL/INT 24 description
|
|
|
|
a) now the alloc()'ed fnode[0] never gets free()'ed
|
|
b) errormode NEVER gets set back to 0 unyil exit()
|
|
|
|
I have NO idea how real DOS handles this;
|
|
the appended patch cures the worst symptoms
|
|
*/
|
|
if (fnode[0].f_count != 0 ||
|
|
fnode[1].f_count != 0 )
|
|
{
|
|
if (ErrorMode == 0)
|
|
put_string("near_fnodes not 0"); /* panic ?? */
|
|
fnode[0].f_count = 0; /* don't panic - THEY ARE unused !! */
|
|
fnode[1].f_count = 0;
|
|
}
|
|
/* PATCH !! END TE 5 JUL 04 */
|
|
|
|
#ifdef DEBUG
|
|
if (bDumpRegs)
|
|
{
|
|
fmemcpy(&error_regs, user_r, sizeof(iregs));
|
|
dump_regs = TRUE;
|
|
dump();
|
|
}
|
|
#endif
|
|
}
|
|
|
|
#if 0
|
|
/* No kernel INT-23 handler required no longer -- 1999/04/15 ska */
|
|
/* ctrl-Break handler */
|
|
#pragma argsused
|
|
VOID INRPT FAR int23_handler(int es, int ds, int di, int si, int bp,
|
|
int sp, int bx, int dx, int cx, int ax,
|
|
int ip, int cs, int flags)
|
|
{
|
|
tsr = FALSE;
|
|
return_mode = 1;
|
|
return_code = -1;
|
|
mod_sto(CTL_C);
|
|
DosMemCheck();
|
|
#ifdef TSC
|
|
StartTrace();
|
|
#endif
|
|
return_user();
|
|
}
|
|
#endif
|
|
|
|
struct int25regs {
|
|
UWORD es, ds;
|
|
UWORD di, si, bp, sp;
|
|
UWORD bx, dx, cx, ax;
|
|
UWORD flags, ip, cs;
|
|
};
|
|
|
|
/*
|
|
this function is called from an assembler wrapper function
|
|
*/
|
|
VOID ASMCFUNC int2526_handler(WORD mode, struct int25regs FAR * r)
|
|
{
|
|
ULONG blkno;
|
|
UWORD nblks;
|
|
BYTE FAR *buf;
|
|
UBYTE drv;
|
|
|
|
if (mode == 0x26)
|
|
mode = DSKWRITEINT26;
|
|
else
|
|
mode = DSKREADINT25;
|
|
|
|
drv = r->ax;
|
|
|
|
if (drv >= lastdrive)
|
|
{
|
|
r->ax = 0x201;
|
|
SET_CARRY_FLAG();
|
|
return;
|
|
}
|
|
|
|
#ifdef WITHFAT32
|
|
{
|
|
struct dpb FAR *dpbp = get_dpb(drv);
|
|
if (dpbp != NULL && ISFAT32(dpbp))
|
|
{
|
|
r->ax = 0x207;
|
|
SET_CARRY_FLAG();
|
|
return;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
nblks = r->cx;
|
|
blkno = r->dx;
|
|
|
|
buf = MK_FP(r->ds, r->bx);
|
|
|
|
if (nblks == 0xFFFF)
|
|
{
|
|
/*struct HugeSectorBlock FAR *lb = MK_FP(r->ds, r->bx); */
|
|
blkno = ((struct HugeSectorBlock FAR *)buf)->blkno;
|
|
nblks = ((struct HugeSectorBlock FAR *)buf)->nblks;
|
|
buf = ((struct HugeSectorBlock FAR *)buf)->buf;
|
|
}
|
|
|
|
InDOS++;
|
|
|
|
r->ax = dskxfer(drv, blkno, buf, nblks, mode);
|
|
|
|
CLEAR_CARRY_FLAG();
|
|
if (r->ax != 0)
|
|
{
|
|
SET_CARRY_FLAG();
|
|
if (mode == DSKWRITEINT26)
|
|
setinvld(drv);
|
|
}
|
|
--InDOS;
|
|
}
|
|
|
|
/*
|
|
VOID int25_handler(struct int25regs FAR * r) { int2526_handler(DSKREAD,r); }
|
|
VOID int26_handler(struct int25regs FAR * r) { int2526_handler(DSKWRITE,r); }
|
|
*/
|
|
|
|
#ifdef TSC
|
|
STATIC VOID StartTrace(VOID)
|
|
{
|
|
if (bTraceNext)
|
|
{
|
|
#ifdef DEBUG
|
|
bDumpRegs = TRUE;
|
|
#endif
|
|
bTraceNext = FALSE;
|
|
}
|
|
#ifdef DEBUG
|
|
else
|
|
bDumpRegs = FALSE;
|
|
#endif
|
|
}
|
|
#endif
|
|
|
|
/* this function is called from an assembler wrapper function
|
|
and serves the internal dos calls - int2f/12xx and int2f/4a01,4a02.
|
|
*/
|
|
struct int2f12regs {
|
|
#ifdef I386
|
|
#ifdef __WATCOMC__
|
|
/* UWORD gs, fs; ** GS/FS are protected through SI/DI */
|
|
#else
|
|
UWORD high_edx,
|
|
#ifdef _MSC_VER
|
|
high_ecx,
|
|
#else /* __BORLANDC__ */
|
|
high_ebx,
|
|
#endif
|
|
high_eax;
|
|
#endif
|
|
#endif
|
|
UWORD es, ds;
|
|
UWORD di, si, bp;
|
|
xreg b, d, c, a;
|
|
UWORD ip, cs, flags;
|
|
UWORD callerARG1; /* used if called from INT2F/12 */
|
|
};
|
|
|
|
/* WARNING: modifications in `r' are used outside of int2F_12_handler()
|
|
* On input r.AX==0x12xx, 0x4A01 or 0x4A02
|
|
*/
|
|
VOID ASMCFUNC int2F_12_handler(struct int2f12regs r)
|
|
{
|
|
COUNT rc;
|
|
long lrc;
|
|
|
|
if (r.AH == 0x4a)
|
|
{
|
|
size_t size = 0, offs = 0xffff;
|
|
|
|
r.ES = offs;
|
|
if (FP_SEG(firstAvailableBuf) == offs) /* HMA present? */
|
|
{
|
|
offs = FP_OFF(firstAvailableBuf);
|
|
size = ~offs; /* BX for query HMA */
|
|
if (r.AL == 0x02) /* allocate HMA space */
|
|
{
|
|
if (r.BX < size)
|
|
size = r.BX;
|
|
AllocateHMASpace(offs, offs+size);
|
|
firstAvailableBuf += size;
|
|
}
|
|
}
|
|
r.DI = offs;
|
|
r.BX = size;
|
|
return;
|
|
}
|
|
|
|
switch (r.AL)
|
|
{
|
|
case 0x00: /* installation check */
|
|
r.AL = 0xff;
|
|
break;
|
|
|
|
case 0x03: /* get DOS data segment */
|
|
r.DS = FP_SEG(&nul_dev);
|
|
break;
|
|
|
|
case 0x06: /* invoke critical error */
|
|
|
|
/* code, drive number, error, device header */
|
|
r.AL = CriticalError(r.callerARG1 >> 8,
|
|
(r.callerARG1 & (EFLG_CHAR << 8)) ? 0 :
|
|
r.callerARG1 & 0xff, r.DI, MK_FP(r.BP, r.SI));
|
|
break;
|
|
|
|
case 0x08: /* decrease SFT reference count */
|
|
{
|
|
sft FAR *p = MK_FP(r.ES, r.DI);
|
|
|
|
r.AX = p->sft_count;
|
|
|
|
if (--p->sft_count == 0)
|
|
--p->sft_count;
|
|
}
|
|
break;
|
|
|
|
case 0x0c: /* perform "device open" for device, set owner for FCB */
|
|
|
|
if (lpCurSft->sft_flags & SFT_FDEVICE)
|
|
{
|
|
request rq;
|
|
|
|
rq.r_unit = 0;
|
|
rq.r_status = 0;
|
|
rq.r_command = C_OPEN;
|
|
rq.r_length = sizeof(request);
|
|
execrh((request FAR *) & rq, lpCurSft->sft_dev);
|
|
}
|
|
|
|
/* just do it always, not just for FCBs */
|
|
lpCurSft->sft_psp = cu_psp;
|
|
break;
|
|
|
|
case 0x0d: /* get dos date/time */
|
|
|
|
r.AX = dos_getdate();
|
|
r.DX = dos_gettime();
|
|
break;
|
|
|
|
case 0x11: /* normalise ASCIIZ filename */
|
|
{
|
|
char c;
|
|
char FAR *s = MK_FP(r.DS, r.SI);
|
|
char FAR *t = MK_FP(r.ES, r.DI);
|
|
|
|
do
|
|
{
|
|
c = *s++;
|
|
/* uppercase character */
|
|
/* for now, ASCII only because nls.c cannot handle DS!=SS */
|
|
if (c >= 'a' && c <= 'z')
|
|
c -= 'a' - 'A';
|
|
else if (c == '/')
|
|
c = '\\';
|
|
*t++ = c;
|
|
}
|
|
while (c);
|
|
break;
|
|
}
|
|
|
|
case 0x12: /* get length of asciiz string */
|
|
|
|
r.CX = fstrlen(MK_FP(r.ES, r.DI)) + 1;
|
|
|
|
break;
|
|
|
|
case 0x13:
|
|
/* uppercase character */
|
|
/* for now, ASCII only because nls.c cannot handle DS!=SS */
|
|
r.AL = (unsigned char)r.callerARG1;
|
|
if (r.AL >= 'a' && r.AL <= 'z')
|
|
r.AL -= 'a' - 'A';
|
|
break;
|
|
|
|
case 0x16:
|
|
/* get address of system file table entry - used by NET.EXE
|
|
BX system file table entry number ( such as returned from 2F/1220)
|
|
returns
|
|
ES:DI pointer to SFT entry
|
|
BX relative entry number within SFT */
|
|
{
|
|
int rel_idx = idx_to_sft_(r.BX);
|
|
|
|
if (rel_idx == -1)
|
|
{
|
|
r.FLAGS |= FLG_CARRY;
|
|
break;
|
|
}
|
|
r.FLAGS &= ~FLG_CARRY;
|
|
r.BX = rel_idx;
|
|
r.ES = FP_SEG(lpCurSft);
|
|
r.DI = FP_OFF(lpCurSft);
|
|
break;
|
|
}
|
|
|
|
case 0x17: /* get current directory structure for drive - used by NET.EXE
|
|
STACK: drive (0=A:,1=B,...)
|
|
; returns
|
|
; CF set if error
|
|
; DS:SI pointer to CDS for drive
|
|
;
|
|
; called like
|
|
; push 2 (c-drive)
|
|
; mov ax,1217
|
|
; int 2f
|
|
;
|
|
; probable use: get sizeof(CDSentry)
|
|
*/
|
|
{
|
|
struct cds FAR *cdsp = get_cds(r.callerARG1 & 0xff);
|
|
|
|
if (cdsp == NULL)
|
|
{
|
|
r.FLAGS |= FLG_CARRY;
|
|
break;
|
|
}
|
|
r.DS = FP_SEG(cdsp);
|
|
r.SI = FP_OFF(cdsp);
|
|
r.FLAGS &= ~FLG_CARRY;
|
|
break;
|
|
}
|
|
|
|
case 0x18: /* get caller's registers */
|
|
|
|
r.DS = FP_SEG(user_r);
|
|
r.SI = FP_OFF(user_r);
|
|
break;
|
|
|
|
case 0x1b: /* #days in February - valid until 2099. */
|
|
|
|
r.AL = (r.CL & 3) ? 28 : 29;
|
|
break;
|
|
|
|
case 0x20: /* get job file table entry */
|
|
{
|
|
psp FAR *p = MK_FP(cu_psp, 0);
|
|
unsigned char FAR *idx;
|
|
|
|
if (r.BX >= p->ps_maxfiles)
|
|
{
|
|
r.AL = -DE_INVLDHNDL;
|
|
r.FLAGS |= FLG_CARRY;
|
|
break;
|
|
}
|
|
idx = &p->ps_filetab[r.BX];
|
|
r.FLAGS &= ~FLG_CARRY;
|
|
r.ES = FP_SEG(idx);
|
|
r.DI = FP_OFF(idx);
|
|
}
|
|
break;
|
|
|
|
case 0x21: /* truename */
|
|
|
|
DosTruename(MK_FP(r.DS, r.SI), MK_FP(r.ES, r.DI));
|
|
|
|
break;
|
|
|
|
case 0x23: /* check if character device */
|
|
{
|
|
struct dhdr FAR *dhp;
|
|
|
|
dhp = IsDevice((BYTE FAR *) DirEntBuffer.dir_name);
|
|
|
|
if (dhp == NULL)
|
|
{
|
|
r.FLAGS |= FLG_CARRY;
|
|
break;
|
|
}
|
|
r.BH = dhp->dh_attr;
|
|
r.FLAGS &= ~FLG_CARRY;
|
|
}
|
|
break;
|
|
|
|
case 0x25: /* get length of asciiz string */
|
|
|
|
r.CX = fstrlen(MK_FP(r.DS, r.SI)) + 1;
|
|
break;
|
|
|
|
case 0x26: /* open file */
|
|
r.FLAGS &= ~FLG_CARRY;
|
|
CritErrCode = SUCCESS;
|
|
lrc = DosOpen(MK_FP(r.DS, r.DX), O_LEGACY | O_OPEN | r.CL, 0);
|
|
goto long_check;
|
|
|
|
case 0x27: /* close file */
|
|
r.FLAGS &= ~FLG_CARRY;
|
|
CritErrCode = SUCCESS;
|
|
rc = DosClose(r.BX);
|
|
goto short_check;
|
|
|
|
case 0x28: /* move file pointer */
|
|
/*
|
|
* RBIL says: "sets user stack frame pointer to dummy buffer,
|
|
* moves BP to AX, performs LSEEK, and restores frame pointer"
|
|
* We obviously don't do it like that. Does this do any harm?! --L.G.
|
|
*/
|
|
r.FLAGS &= ~FLG_CARRY;
|
|
CritErrCode = SUCCESS;
|
|
if (r.BP < 0x4200 || r.BP > 0x4202)
|
|
goto error_invalid;
|
|
#if 0
|
|
{
|
|
sft FAR *s = get_sft(r.BX);
|
|
if ((rc = _SftSeek(s, MK_ULONG(r.CX, r.DX), r.BP & 0xff)) >= SUCCESS)
|
|
{
|
|
r.DX = hiword (s->sft_posit);
|
|
r.AX = loword (s->sft_posit);
|
|
}
|
|
}
|
|
goto short_check;
|
|
#else
|
|
goto error_invalid;
|
|
#endif
|
|
|
|
case 0x29: /* read from file */
|
|
r.FLAGS &= ~FLG_CARRY;
|
|
CritErrCode = SUCCESS;
|
|
lrc = DosRead(r.BX, r.CX, MK_FP(r.DS, r.DX));
|
|
goto long_check;
|
|
|
|
case 0x2a: /* Set FastOpen but does nothing. */
|
|
|
|
r.FLAGS &= ~FLG_CARRY;
|
|
break;
|
|
|
|
case 0x2c: /* added by James Tabor For Zip Drives
|
|
Return Null Device Pointer */
|
|
/* by UDOS+RBIL: get header of SECOND device driver in device chain,
|
|
omitting the NUL device TE */
|
|
r.BX = FP_SEG(nul_dev.dh_next);
|
|
r.AX = FP_OFF(nul_dev.dh_next);
|
|
|
|
break;
|
|
|
|
case 0x2e: /* GET or SET error table addresse - ignored
|
|
called by MS debug with DS != DOSDS, printf
|
|
doesn't work!! */
|
|
break;
|
|
|
|
case 0x2f:
|
|
if (r.DX)
|
|
{
|
|
os_setver_major = r.DL;
|
|
os_setver_minor = r.DH;
|
|
}
|
|
else
|
|
{
|
|
os_setver_major = os_major;
|
|
os_setver_minor = os_minor;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
if (r.AL <= 0x31)
|
|
{
|
|
put_string("unimplemented internal dos function INT2F/12");
|
|
put_unsigned(r.AL, 16, 2);
|
|
put_string("\n");
|
|
r.FLAGS |= FLG_CARRY;
|
|
}
|
|
}
|
|
return;
|
|
long_check:
|
|
if (lrc >= SUCCESS)
|
|
{
|
|
r.AX = (UWORD)lrc;
|
|
return;
|
|
}
|
|
rc = (int)lrc;
|
|
short_check:
|
|
if (rc < SUCCESS)
|
|
goto error_exit;
|
|
return;
|
|
error_invalid:
|
|
rc = DE_INVLDFUNC;
|
|
error_exit:
|
|
r.AX = -rc;
|
|
if (CritErrCode == SUCCESS)
|
|
CritErrCode = r.AX; /* Maybe set */
|
|
r.FLAGS |= FLG_CARRY;
|
|
}
|
|
|
|
/*
|
|
* 2000/09/04 Brian Reifsnyder
|
|
* Modified interrupts 0x25 & 0x26 to return more accurate error codes.
|
|
*/
|
|
|