/* 
 * All modifications in this file to the original code are
 * (C) Copyright 1992, ..., 2004 the "DOSEMU-Development-Team".
 *
 * for details see file COPYING in the DOSEMU distribution
 */

/*
 * DOSEMU debugger,  1995 Max Parke <mhp@light.lightlink.com>
 *
 * (c) Copyright 1995-1996, Max H. Parke under the terms of the
 *     GNU Public License, incorporated herein by reference
 *
 * This is file mhpdbgc.c
 *
 * changes:
 *
 *   10Jul96 Hans Lermen <lermen@elserv.ffm.fgan.de>
 *           next round of DPMI support:
 *           - new modes for mode command: +d, -d
 *             ( defaults to having DPMI enabled )
 *           - now can single step through DPMI-client
 *           - now can set breakpoints in DPMI-client
 *           - now has DPMI-INTx type breakpoints with matching for AX
 *           - fixed disassembler and addresses to reflect
 *             segmented protected mode (linear mode wasn't useable for DPMI)
 *           - ldt commando now skips NULL-entries.
 *
 *   19May96 Max Parke <mhp@lightlink.com>
 *           - added a little support for DPMI:
 *               - new 'ldt' command
 *               - if '#' as first char of addresses, use LDT to lookup
 *           - changed default 'd' command length to 128 bytes
 *           - changed handling of "previous" d and u commands
 *           - fix a warning on sprintf
 *
 *   16Sep95 Hans Lermen <lermen@elserv.ffm.fgan.de>
 */

#define LDT_ENTRIES 8192
#define LDT_ENTRY_SIZE 8
#define MAX_SELECTORS 8192

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdarg.h>
#include <regex.h>

#include "bitops.h"
#include "config.h"
#include "emu.h"
#include "cpu.h"
#include "dpmi.h"
#include "utilities.h"
#include "dosemu_config.h"
#include "hma.h"
#include "dis8086.h"

#define MHP_PRIVATE
#include "mhpdbg.h"

#define makeaddr(x,y) ((((unsigned long)x) << 4) + (unsigned long)y)

/* prototypes */
static void* mhp_getadr(unsigned char *, unsigned int *, unsigned int *, unsigned int *);
static void mhp_regs  (int, char *[]);
static void mhp_r0    (int, char *[]);
static void mhp_dis   (int, char *[]);
static void mhp_disasm  (int, char *[]);
static void mhp_go      (int, char *[]);
static void mhp_stop    (int, char *[]);
static void mhp_trace   (int, char *[]);
static void mhp_tracec  (int, char *[]);
static void mhp_trace_force (int, char *[]);
static void mhp_regs32  (int, char *[]);
static void mhp_bp      (int, char *[]);
static void mhp_bc      (int, char *[]);
static void mhp_bl      (int, char *[]);
static void mhp_bpint   (int, char *[]);
static void mhp_bcint   (int, char *[]);
static void mhp_bpintd  (int, char *[]);
static void mhp_bcintd  (int, char *[]);
static void mhp_bpload  (int, char *[]);
static void mhp_rmapfile(int, char *[]);
static void mhp_mode    (int, char *[]);
static void mhp_rusermap(int, char *[]);
static void mhp_kill    (int, char *[]);
static void mhp_help    (int, char *[]);
static void mhp_enter   (int, char *[]);
static void mhp_print_ldt       (int, char *[]);
static void mhp_debuglog (int, char *[]);
static void mhp_dump_to_file (int, char *[]);
static void mhp_bplog   (int, char *[]);
static void mhp_bclog   (int, char *[]);
static void print_log_breakpoints(void);

static unsigned int lookup(unsigned char *, unsigned int *, unsigned int *);
static inline int get_ldt(void *);

/* static data */
static unsigned int linmode = 0;
static unsigned int codeorg = 0;

static unsigned int dpmimode=1, saved_dpmimode=1;
#define IN_DPMI  (in_dpmi && !in_dpmi_dos_int && dpmimode)

static char lastd[32];
static char lastu[32];
static char lastldt[32];

static struct symbol_entry symbol_table[MAXSYM];
static unsigned int last_symbol = 0;
static unsigned int addrmax;

static struct symbl2_entry symbl2_table[MAXSYM];
static unsigned int last_symbol2 = 0;
static unsigned int symbl2_org = 0;
/* static unsigned int symbl2_end = 0; */

static int trapped_bp=-1, trapped_bp_;

int traceloop=0;
char loopbuf[4] = "";

/* constants */
static const struct cmd_db cmdtab[] = {
   {"r0",            mhp_r0},
   {"r" ,            mhp_regs},
   {"e",             mhp_enter},
   {"ed",            mhp_enter},
   {"d",             mhp_dis},
   {"u",             mhp_disasm},
   {"g",             mhp_go},
   {"stop",          mhp_stop},
   {"mode",          mhp_mode},
   {"t",             mhp_trace},
   {"tc",            mhp_tracec},
   {"tf",            mhp_trace_force},
   {"r32",           mhp_regs32},
   {"bp",            mhp_bp},
   {"bc",            mhp_bc},
   {"bl",            mhp_bl},
   {"bpint",         mhp_bpint},
   {"bcint",         mhp_bcint},
   {"bpintd",        mhp_bpintd},
   {"bcintd",        mhp_bcintd},
   {"bpload",        mhp_bpload},
   {"bplog",         mhp_bplog},
   {"bclog",         mhp_bclog},
   {"rmapfile",      mhp_rmapfile},
   {"rusermap",      mhp_rusermap},
   {"kill",          mhp_kill},
   {"?",             mhp_help},
   {"ldt",           mhp_print_ldt},
   {"log",           mhp_debuglog},
   {"dump",          mhp_dump_to_file},
   {"",              NULL}
};

static const char help_page[]=
  "q                      Quit the debug session\n"
  "kill                   Kill the dosemu process\n"
  "r                      list regs\n"
  "e/ed ADDR val [val ..] modify memory (0-1Mb), previous addr for ADDR='-'\n"
  /* val can be: a hex val (in case of 'e') or decimal (in case of 'ed')
   * With 'ed' also a hexvalue in form of 0xFF is allowed and can be mixed,
   * val can also be a character constant (e.g. 'a') or a string ("abcdef"),
   * val can also be any register symbolic and has the size of that register.
   * Except for strings and registers, val can be suffixed by
   * W(word size) or L (long size), default size is byte.
   */
  "d ADDR SIZE            dump memory (no limit)\n"
  "u ADDR SIZE            unassemble memory (no limit)\n"
  "g                      go (if stopped)\n"
  "stop                   stop (if running)\n"
  "mode 0|1|+d|-d         set mode (0=SEG16, 1=LIN32) for u and d commands\n"
  "t                      single step (not fully debugged!!!)\n"
  "tc                     single step, loop forever until key pressed\n"
  "tf                     single step, force over IRET\n"
  "r32                    dump regs in 32 bit format\n"
  "bp addr                set int3 style breakpoint\n"
  "bpint/bcint xx         set/clear breakpoint on INT xx\n"
  "bpintd/bcintd xx [ax]  set/clear breakpoint on DPMI INT xx [ax]\n"
  "bpload                 stop at start of next loaded DOS program\n"
  "bl                     list active breakpoints\n"
  "bplog/bclog regex      set/clear breakpoint on logoutput using regex\n"
  "rusermap org fn        read microsoft linker format .MAP file 'fn'\n"
  "rmapfile [file]        (re)read a dosemu.map ('nm' format) file\n"
  "                       code origin = 'org'.\n"
  "ldt sel lines          dump ldt starting at selector 'sel' for 'lines'\n"
  "log [flags]            get/set debug-log flags (e.g 'log +M-k')\n"
  "dump ADDR SIZE FILE    dump a piece of memory to file\n"
  "<ENTER>                repeats previous command\n";

/********/
/* CODE */
/********/

#define AXLIST_SIZE  32
static unsigned long mhp_axlist[AXLIST_SIZE];
static int axlist_count=0;

int mhp_getaxlist_value(int v, int mask)
{
  int i;
  for (i=0; i < axlist_count; i++) {
    if (!((v ^ mhp_axlist[i]) & mask)) return i;
  }
  return -1;
}

static void mhp_delaxlist_value(int v, int mask)
{
  int i,j;
  
  for (i=0,j=0; i < axlist_count; i++) {
    if (((v ^ mhp_axlist[i]) & mask)) {
      mhp_axlist[j] = mhp_axlist[i];
      j++;
    }
  }
  axlist_count = j;
}

static int mhp_addaxlist_value(int v)
{
  if (mhp_getaxlist_value(v, -1) >= 0) return 1;
  if (axlist_count < (AXLIST_SIZE-1)) {
    mhp_axlist[axlist_count++]=v;
    return 1;
  }
  return 0;
}

static inline int get_ldt(void *buffer)
{
  return modify_ldt(0, buffer, LDT_ENTRIES * LDT_ENTRY_SIZE);
}

static unsigned char * getname(unsigned int addr)
{
   int i;
   if ((addr < 0x100000) || (addr > addrmax))
      return(NULL);
   for (i=0; i < last_symbol; i++) {
      if (symbol_table[i].addr == addr)
         return(symbol_table[i].name);
   }
   return(NULL);
}

static unsigned char * getname2(unsigned int seg, unsigned int off)
{
   int i;
   for (i=0; i < last_symbol2; i++) {
      if ((symbl2_table[i].seg == seg) &&
          (symbl2_table[i].off == off))
         return(symbl2_table[i].name);
   }
   return(NULL);
}

static unsigned char * getname2u(unsigned int addr)
{
   int i;
   for (i=0; i < last_symbol2; i++) {
      if (addr == makeaddr(symbl2_table[i].seg, symbl2_table[i].off))
         return(symbl2_table[i].name);
   }
   return(NULL);
}

static unsigned int    getaddr(unsigned char * n1)
{
   int i;
   if (strlen(n1) == 0)
      return 0;
   for (i=0; i < last_symbol; i++) {
      if (strcmp(symbol_table[i].name, n1) == 0)
         return(symbol_table[i].addr);
   }
   return 0;
}

static unsigned int lookup(unsigned char * n1, unsigned int *s1, unsigned int * o1)
{
   int i;
   if (!strlen(n1))
      return 0;
   for (i=0; i < last_symbol2; i++) {
      if (!strcmp(symbl2_table[i].name, n1)) {
         *s1=symbl2_table[i].seg;
         *o1=symbl2_table[i].off;
         return makeaddr(*s1,*o1);
      }
   }
   return 0;
}

static void mhp_rusermap(int argc, char *argv[])
{
  FILE * ifp;
  unsigned char bytebuf[IBUFS];
  unsigned long org;
  unsigned int  seg;
  unsigned int  off;

  char * srchfor = "  Address         Publics by Value";

  if (argc < 3) {
     mhp_printf("syntax: rusermap <org> <file>\n");
     return;
  }

  sscanf(argv[1], "%lx", &org);
  symbl2_org = org;

  ifp = fopen(argv[2], "r");
  if (!ifp) {
     mhp_printf("unable to open map file %s\n", argv[2]);
     return;
  }
  mhp_printf("reading map file %s\n", argv[2]);
  last_symbol2 = 0;
  for(;;) {
     if(!fgets(bytebuf, 100, ifp)) {
        mhp_printf("error: could not find following in %s:\n%s\n",
                   argv[2], srchfor);
        return;
     }
     if (!strlen(bytebuf))
        continue;
     if (!memcmp(bytebuf, srchfor, strlen(srchfor)))
        break;
  }
  for(;;) {
     if(!fgets(bytebuf, 100, ifp))
        break;
     if(bytebuf[5] != ':')
        continue;
     if(bytebuf[12] != ' ')
        continue;
     bytebuf[5] = ' ';
     sscanf(&bytebuf[1], "%x %x", &seg, &off);
     symbl2_table[last_symbol2].seg  = seg + (symbl2_org >> 4);
     symbl2_table[last_symbol2].off  = off;
     symbl2_table[last_symbol2].type = ' ';
     sscanf(&bytebuf[17], "%s", (char *)&symbl2_table[last_symbol2].name);
     last_symbol2++;
  }
  fclose(ifp);
/*symbl2_end = symbl2_table[last_symbol2-1].addr;*/
  mhp_printf("%d symbol(s) processed\n", last_symbol2);
  mhp_printf("highest address %04x:%04x(%s)\n",
             symbl2_table[last_symbol2-1].seg,
             symbl2_table[last_symbol2-1].off,
             symbl2_table[last_symbol2-1].name);

}

static void mhp_rmapfile(int argc, char *argv[])
{
  FILE * ifp = NULL;
  unsigned char bytebuf[IBUFS];
  unsigned long a1;
  char *map_fname = DOSEMU_MAP_PATH;

  if (argc >= 2) {
    map_fname = argv[1];
  }
  if (map_fname == NULL && dosemu_proc_self_exe != NULL) {
    /* try to get symbols on the fly */
    map_fname = malloc(strlen(dosemu_proc_self_exe) + 60);
    strcpy(map_fname, "nm ");
    strcat(map_fname, dosemu_proc_self_exe);
    strcat(map_fname, " | grep -v '\\(compiled\\)\\|\\(\\.o$\\)\\|\\( a \\)' | sort");
    ifp = popen(map_fname, "r");
  } else if (map_fname != NULL) {
    ifp = fopen(map_fname, "r");
  }
  if (!ifp) {
     mhp_printf("unable to open map file %s\n", map_fname);
     return;
  }
  mhp_printf("Reading map file %s\n", map_fname);
  last_symbol = 0;
  while (last_symbol < MAXSYM) {
     if(!fgets(bytebuf, 100, ifp))
        break;
     if (!strlen(bytebuf) || !isxdigit(*bytebuf))
        continue;
      /* recent versions of nm put out the address in long long
       * format, with 16 digits: we can't rely on absolute offsets.
       */
      sscanf(bytebuf, "%lx %c %40s", &a1, &symbol_table[last_symbol].type,
              (char *)&symbol_table[last_symbol].name);
#ifdef __ELF__
     if (a1 < 0x08000000) continue;
#else
     if (a1 < 0x20000000)
        continue;
     if (a1 > 0x28000000)
        break;
#endif
     symbol_table[last_symbol].addr = a1;
     last_symbol++;
  }
  if (map_fname != argv[1] && map_fname != DOSEMU_MAP_PATH) {
    pclose(ifp);
    free(map_fname);
  }
  else
    fclose(ifp);
  addrmax = symbol_table[last_symbol-1].addr;
  mhp_printf("%d symbol(s) processed\n", last_symbol);
  mhp_printf("highest address %08x(%s)\n", addrmax, getname(addrmax));
}

enum {
   _SSr, _CSr, _DSr, _ESr, _FSr, _GSr,
   _AXr, _BXr, _CXr, _DXr, _SIr, _DIr, _BPr, _SPr, _IPr, _FLr,
  _EAXr,_EBXr,_ECXr,_EDXr,_ESIr,_EDIr,_EBPr,_ESPr,_EIPr
};

static int last_decode_symreg;

static int decode_symreg(char *regn)
{
  static char reg_syms[]="SS  CS  DS  ES  FS  GS  "
			 "AX  BX  CX  DX  SI  DI  BP  SP  IP  FL  "
 			 "EAX EBX ECX EDX ESI EDI EBP ESP EIP ";
  char rn[5], *s;
  int n;

  last_decode_symreg = -1;
  if (!isalpha(*regn))
	return -1;
  s=rn; n=0; rn[4]=0;
  while (n<4)
  {
	*s++=(isalpha(*regn)? toupper(*regn++): ' '); n++;
  }
  if (!(s = strstr(reg_syms, rn)))
	return -1;
  last_decode_symreg = ((s-reg_syms) >> 2);
  return last_decode_symreg;
}

static unsigned long mhp_getreg(unsigned char * regn)
{
  if (IN_DPMI) return dpmi_mhp_getreg(decode_symreg(regn));
  else switch (decode_symreg(regn)) {
    case _SSr: return LWORD(ss);
    case _CSr: return LWORD(cs);
    case _DSr: return LWORD(ds);
    case _ESr: return LWORD(es);
    case _FSr: return LWORD(fs);
    case _GSr: return LWORD(gs);
    case _AXr: return LWORD(eax);
    case _BXr: return LWORD(ebx);
    case _CXr: return LWORD(ecx);
    case _DXr: return LWORD(edx);
    case _SIr: return LWORD(esi);
    case _DIr: return LWORD(edi);
    case _BPr: return LWORD(ebp);
    case _SPr: return LWORD(esp);
    case _IPr: return LWORD(eip);
    case _FLr: return LWORD(eflags);
    case _EAXr: return REG(eax);
    case _EBXr: return REG(ebx);
    case _ECXr: return REG(ecx);
    case _EDXr: return REG(edx);
    case _ESIr: return REG(esi);
    case _EDIr: return REG(edi);
    case _EBPr: return REG(ebp);
    case _ESPr: return REG(esp);
    case _EIPr: return REG(eip);
  }
  return -1;
}


static void mhp_setreg(unsigned char * regn, unsigned long val)
{
  if (IN_DPMI) {
    dpmi_mhp_setreg(decode_symreg(regn),val);
    return;
  }
  else switch (decode_symreg(regn)) {
    case _SSr: LWORD(ss) = val; break;
    case _CSr: LWORD(cs) = val; break;
    case _DSr: LWORD(ds) = val; break;
    case _ESr: LWORD(es) = val; break;
    case _FSr: LWORD(fs) = val; break;
    case _GSr: LWORD(gs) = val; break;
    case _AXr: LWORD(eax) = val; break;
    case _BXr: LWORD(ebx) = val; break;
    case _CXr: LWORD(ecx) = val; break;
    case _DXr: LWORD(edx) = val; break;
    case _SIr: LWORD(esi) = val; break;
    case _DIr: LWORD(edi) = val; break;
    case _BPr: LWORD(ebp) = val; break;
    case _SPr: LWORD(esp) = val; break;
    case _IPr: LWORD(eip) = val; break;
    case _FLr: LWORD(eflags) = val; break;
    case _EAXr: REG(eax) = val; break;
    case _EBXr: REG(ebx) = val; break;
    case _ECXr: REG(ecx) = val; break;
    case _EDXr: REG(edx) = val; break;
    case _ESIr: REG(esi) = val; break;
    case _EDIr: REG(edi) = val; break;
    case _EBPr: REG(ebp) = val; break;
    case _ESPr: REG(esp) = val; break;
    case _EIPr: REG(eip) = val; break;
  }
}


static void mhp_go(int argc, char * argv[])
{
   if (!mhpdbgc.stopped) {
      mhp_printf("already in running state\n");
   } else {
      dpmi_mhp_setTF(0);
      WRITE_FLAGS(READ_FLAGS() & ~TF);
      vm86s.vm86plus.vm86dbg_TFpendig=0;
      mhpdbgc.stopped = 0;
      pic_sti();
   }
}

static void mhp_r0(int argc, char * argv[])
{
   if (trapped_bp == -2) trapped_bp=trapped_bp_;
   else trapped_bp=-1;
   mhp_regs(argc,argv);
}

static void mhp_stop(int argc, char * argv[])
{
   if (mhpdbgc.stopped) {
      mhp_printf("already in stopped state\n");
   } else {
      mhpdbgc.stopped = 1;
      mhp_cmd("r0");
   }
}

static void mhp_trace(int argc, char * argv[])
{
   if (!mhpdbgc.stopped) {
      mhp_printf("must be in stopped state\n");
   } else {
      mhpdbgc.stopped = 0;
      if (in_dpmi) {
        dpmi_mhp_setTF(1);
      }
      WRITE_FLAGS(READ_FLAGS() | TF);
      mhpdbgc.trapcmd = 1;
   }
}

static void mhp_tracec(int argc, char * argv[])
{
   if (!mhpdbgc.stopped) {
      mhp_printf("must be in stopped state\n");
   } else {
     mhp_trace (argc, argv);
     traceloop=1;
     strcpy(loopbuf,"t");
   }
}

static void mhp_trace_force(int argc, char * argv[])
{
   if (!mhpdbgc.stopped) {
      mhp_printf("must be in stopped state\n");
   } else {
      mhpdbgc.stopped = 0;
      if (in_dpmi) {
        dpmi_mhp_setTF(1);
      }
      WRITE_FLAGS(READ_FLAGS() | TF);
      vm86s.vm86plus.vm86dbg_TFpendig=1;
      mhpdbgc.trapcmd = 1;
      /* disable PIC: we want to trace the program, not the HW int handlers */
      pic_cli();
   }
}

static void mhp_dis(int argc, char * argv[])
{
   unsigned int nbytes;
   unsigned long seekval;
   int i,i2;
   unsigned char * buf = 0;
   unsigned int seg;
   unsigned int off;
   unsigned int limit;
   int data32=0;

   if (argc > 1) {
      seekval = (unsigned long)mhp_getadr(argv[1], &seg, &off, &limit);
      strcpy(lastd, argv[1]);
   } else {
      if (!strlen(lastd)) {
         mhp_printf("No previous \'d\' command\n");
         return;
      }
      seekval = (unsigned long)mhp_getadr(lastd, &seg, &off, &limit);
   }
   buf = (unsigned char *) seekval;

   if (argc > 2)
      sscanf(argv[2], "%x", &nbytes);
   else
      nbytes = 128;

   if ((nbytes == 0) || (nbytes > 256))
      nbytes = 128;

#if 0
   mhp_printf( "seekval %08lX nbytes:%d\n", seekval, nbytes);
#else
   mhp_printf( "\n");
#endif
   if (IN_DPMI && seg) data32=dpmi_mhp_get_selector_size(seg);
   for (i=0; i<nbytes; i++) {
      if ((i&0x0f) == 0x00) {
         if (seg|off) {
            if (data32) mhp_printf("%s%04x:%08x ", IN_DPMI?"#":"" ,seg, off+i);
            else mhp_printf("%s%04x:%04x ", IN_DPMI?"#":"" ,seg, off+i);
         }
         else
            mhp_printf( "%08lX ", (unsigned long)seekval+i);
      }
      mhp_printf( "%02X ", buf[i]);
      if ((i&0x0f) == 0x0f) {
         mhp_printf( " ");
         for (i2=i-15;i2<=i;i2++){
            if ((buf[i2]&0x7F) >= 0x20) {
               mhp_printf( "%c", buf[i2]&0x7f);
            } else {
               mhp_printf( "%c", '.');
            }
         }
         mhp_printf( "\n");
      }
   }

   if (seg|off) {
      if ((lastd[0] == '#') || (IN_DPMI)) {
         sprintf(lastd, "#%x:%x", seg, off+i);
      } else {
         sprintf(lastd, "%x:%x", seg, off+i);
      }
   } else {
      sprintf(lastd, "%lx", seekval + i);
   }
}

static void mhp_dump_to_file(int argc, char * argv[])
{
   unsigned int nbytes;
   unsigned long seekval;
   unsigned char * buf = 0;
   unsigned int seg;
   unsigned int off;
   unsigned int limit=0;
   int fd;

   if (argc <= 3) {
      mhp_printf("USAGE: dump <addr> <size> <filesname>\n");
      return;
   }

   seekval = (unsigned long)mhp_getadr(argv[1], &seg, &off, &limit);

   buf = (unsigned char *) seekval;
   sscanf(argv[2], "%x", &nbytes);
   if (nbytes == 0) {
      mhp_printf("invalid size\n");
      return;
   }

   fd = open(argv[3], O_WRONLY | O_CREAT | O_TRUNC, 00775);

   if (fd < 0) {
      mhp_printf("cannot open/create file %s\n%s\n", argv[3], strerror(errno));
      return;
   }
   if (write(fd, buf, nbytes) != nbytes) {
      mhp_printf("write error: %s\n", strerror(errno));
   }
   close(fd);
}

static void mhp_mode(int argc, char * argv[])
{
   if (argc >=2) {
     if (argv[1][0] == '0') linmode = 0;
     if (argv[1][0] == '1') linmode = 1;
     if (!strcmp(argv[1],"+d")) dpmimode=saved_dpmimode=1;
     if (!strcmp(argv[1],"-d")) dpmimode=saved_dpmimode=0;
   }
   mhp_printf ("current mode: %s, dpmi %s%s\n",
     linmode?"lin32":"seg16", dpmimode?"enabled":"disabled",
     dpmimode!=saved_dpmimode ? (saved_dpmimode?"[default enabled]":"[default disabled]"):"");
   return;
}

static void mhp_disasm(int argc, char * argv[])
{
   int rc;
   unsigned int nbytes;
   unsigned long org;
   unsigned long seekval;
   int def_size;
   unsigned int bytesdone;
   int i;
   unsigned char * buf = 0;
   unsigned char bytebuf[IBUFS];
   unsigned char frmtbuf[IBUFS];
   unsigned int seg;
   unsigned int off;
   unsigned int refseg;
   unsigned int ref;
   unsigned int limit;
   int segmented = (linmode == 0);

   if (argc > 1) {
      seekval = (unsigned long)mhp_getadr(argv[1], &seg, &off, &limit);
      strcpy(lastu, argv[1]);
   } else {
      if (!strlen(lastu)) {
         mhp_printf("No previous \'u\' command\n");
         return;
      }
      seekval = (unsigned long)mhp_getadr(lastu, &seg, &off, &limit);
   }

   if (argc > 2) {
      if ((argv[2][0] == 'l') || (argv[2][0] == 'L'))
         sscanf(&argv[2][1], "%x", &nbytes);
      else
         sscanf(argv[2], "%x", &nbytes);
   } else {
      nbytes = 32;
   }

   if ((nbytes == 0) || (nbytes > 256))
      nbytes = 32;

#if 0
   mhp_printf( "seekval %08lX nbytes:%d\n", seekval, nbytes);
#else
   mhp_printf( "\n");
#endif

   if (IN_DPMI) {
     def_size = (dpmi_mhp_get_selector_size(seg)? 3:0);
     segmented =1;
   }
   else {
     if (seekval < (a20 ? 0x10fff0 : 0x100000)) def_size = (linmode? 3:0);
     else if (lastu[0] == '#')
        def_size = 0;
     else def_size = 3;
   }
   rc=0;
   buf = (unsigned char *) seekval;
   org = codeorg ? codeorg : seekval;

   for (bytesdone = 0; bytesdone < nbytes; bytesdone += rc) {
       if (!segmented) {
          if (getname(org+bytesdone))
             mhp_printf ("%s:\n", getname(org+bytesdone));
       } else {
          if (getname2(seg,off+bytesdone))
             mhp_printf ("%s:\n", getname2(seg,off));
       }
       refseg = seg;
       rc = dis_8086(org+bytesdone, buf+bytesdone, frmtbuf, def_size,
                  &refseg, &ref, (IN_DPMI ? dpmi_mhp_getselbase(refseg) : 0), 16);
       for (i=0;i<rc;i++) {
           sprintf(&bytebuf[i*2], "%02X", *(buf+bytesdone+i) );
           bytebuf[(i*2)+2] = 0x00;
       }
       if (segmented) {
          char *x=(IN_DPMI ? "#" : "");
          if (def_size) {
            mhp_printf( "%s%04x:%08x %-16s %s", x, seg, off+bytesdone, bytebuf, frmtbuf);
          }
          else mhp_printf( "%s%04x:%04x %-16s %s", x, seg, off+bytesdone, bytebuf, frmtbuf);
          if ((ref) && (getname2u(ref)))
             mhp_printf ("(%s)", getname2u(ref));
       } else {
          mhp_printf( "%08x: %-16s %s", org+bytesdone, bytebuf, frmtbuf);
          if ((ref) && (getname(ref)))
             mhp_printf ("(%s)", getname(ref));
       }
       mhp_printf( "\n");
   }

   if (segmented) {
      if ((lastu[0] == '#') || (IN_DPMI)) {
         sprintf(lastu, "#%x:%x", seg, off+bytesdone);
      } else {
         sprintf(lastu, "%x:%x", seg, off+bytesdone);
      }
   } else {
      sprintf(lastu, "%lx", seekval + bytesdone);
   }
}

enum {
  V_NONE=0, V_BYTE=1, V_WORD=2, V_DWORD=4, V_STRING=8
};

static int get_value(unsigned long *v, unsigned char *s, int base)
{
   int len = strlen(s);
   int t;
   char *tt;

   if (!len) return V_NONE;
   t = s[len-1];
   if (len >2) {
     /* check for string value */
     if (t == '"' && s[0] == '"') {
       s[len-1] = 0;
       return V_STRING;
     }
   }
   if ((tt = strchr(" wl", tolower(t))) !=0) {
     len--;
     s[len] = 0;
     t = (int)(tt - " wl") << 1;
   }
   else t = V_NONE;
   if (len >2) {
     if (s[len-1] == '\'' && s[0] == '\'') {
       *v = 0;
       len -=2;
       if (len > sizeof(*v)) len = sizeof(*v);
       strncpy((char *)v, s+1, len);
       if (t != V_NONE) return t;
       if (len <  2) return V_BYTE;
       if (len <  4) return V_WORD;
       return V_DWORD;
     }
   }
   *v = mhp_getreg(s);
   if (last_decode_symreg >=0) {
     if (last_decode_symreg < _EAXr) return V_WORD;
     return V_DWORD;
   }
   *v = strtoul(s,0,base);
   if (t == V_NONE) return V_BYTE;
   return t;
}

static void mhp_enter(int argc, char * argv[])
{
   int size;
   static unsigned char * zapaddr = (char *)-1;
   unsigned int seg, off;
   unsigned long val;
   unsigned int limit;
   unsigned char *arg;
   int base = 16;

   if (argc < 3)
      return;

   if (!strcmp(argv[1],"-")) {
     if ((int)zapaddr == -1) {
        mhp_printf("Address invalid, no previous 'e' command with address\n");
        return;
     }
   }
   else  zapaddr = (unsigned char*)mhp_getadr(argv[1], &seg, &off, &limit);
   if ((a20 ?0x10fff0 : 0x100000) < (unsigned long)zapaddr) {
      mhp_printf("Address invalid\n");
      return;
   }
   if (!strcmp(argv[0], "ed")) base = 0;
   argv += 2;
   while ((arg = *argv) != 0) {
      size = get_value(&val, arg, base);
      switch (size) {
        case V_BYTE:
        case V_WORD:
        case V_DWORD: {
          memcpy(zapaddr, &val, size);
          zapaddr += size;
          break;
        }
        case V_STRING: {
          size = strlen(arg+1);
          memcpy(zapaddr, arg+1, size);
          zapaddr += size;
          break;
        }
      }
      argv++;
   }
}

static void* mhp_getadr(unsigned char * a1, unsigned int * s1, unsigned int *o1, unsigned int *lim)
{
   static char buffer[0x10000];
   unsigned char * srchp;
   unsigned int seg1;
   unsigned int off1;
   unsigned long ul1;
   int selector = 0;
   int use_ldt = IN_DPMI;
   unsigned long * lp;
   unsigned long base_addr, limit;

   *lim = 0xFFFFFFFF;

   if (use_ldt) selector = 1;
   if (*a1 == '#') {
      selector = 1;
      *lim = 0;
      a1 ++;
   }
   if(*a1 == '*') {
      if (use_ldt) {
        dpmi_mhp_getcseip(&seg1,&off1);
        *lim = 0;
        selector=2;
      }
      else {
        *s1 = LWORD(cs);
        *o1 = LWORD(eip);
        return (void*) makeaddr(LWORD(cs), LWORD(eip));
      }
   }
   if (selector != 2) {
     if(*a1 == '$') {
        if (use_ldt) {
          dpmi_mhp_getssesp(&seg1,&off1);
          *lim = 0;
          selector=2;
        }
        else {
          *s1 = LWORD(ss);
          *o1 = LWORD(esp);
          return (void*) makeaddr(LWORD(ss), LWORD(esp));
        }
     }
     if (selector != 2) {
       if ((ul1 = lookup(a1, s1, o1))) {
          return (void*)ul1;
       }
       if ((ul1 = getaddr(a1))) {
          *s1 = 0;
          *o1 = 0;
          return (void*)ul1;
       }
       if (!(srchp = (unsigned char *)strchr(a1, ':'))) {
          sscanf(a1, "%lx", &ul1);
          *s1 = 0;
          *o1 = 0;
          return (void*)ul1;
       }
       if ( (seg1 = mhp_getreg(a1)) == -1) {
               *srchp = ' ';
               sscanf(a1, "%x", &seg1);
               *srchp = ':';
       }
       if ( (off1 = mhp_getreg(srchp+1)) == -1) {
               sscanf(srchp+1, "%x", &off1);
       }
     }
   }
   *s1 = seg1;
   *o1 = off1;

   if (!selector)
      return (void*)makeaddr(seg1,off1);

   if (!(seg1 & 0x4)) {
     mhp_printf("GDT selectors not supported yet\n");
     return (void *)0;
   }

   if (get_ldt(buffer) < 0) {
     mhp_printf("error getting ldt\n");
     return (void *)0;
   }

   lp = (unsigned long *) buffer;
   lp += (seg1 & 0xFFF8) >> 2;

   base_addr = (*lp >> 16) & 0x0000FFFF;
   limit = *lp & 0x0000FFFF;
   lp++;
   /* Second 32 bits of descriptor */
   base_addr |= (*lp & 0xFF000000) | ((*lp << 16) & 0x00FF0000);
   limit |= (*lp & 0x000F0000);
   if (*lp & 0x00800000) limit <<= 12;

   if ((limit == 0) && (base_addr == 0)) {
     mhp_printf("selector %x appears to be invalid\n", seg1);
     return (void *)0;
   }

   if (off1 >= limit) {
     mhp_printf("offset %x exceeds segment limit %x\n", off1, limit);
     return (void *)0;
   }

   *lim = limit - off1;
   return (void *) (base_addr + off1);
}

int mhp_setbp(unsigned long seekval)
{
   int i1;
   for (i1=0; i1 < MAXBP; i1++) {
      if (mhpdbgc.brktab[i1].brkaddr == (unsigned char *)seekval) {
         mhp_printf( "Duplicate breakpoint, nothing done\n");
         return 0;
      }
   }
   for (i1=0; i1 < MAXBP; i1++) {
      if (!mhpdbgc.brktab[i1].brkaddr) {
         if (i1==trapped_bp) trapped_bp=-1;
         mhpdbgc.brktab[i1].brkaddr = (unsigned char *)seekval;
         mhpdbgc.brktab[i1].is_dpmi = IN_DPMI;
         return 1;
      }
   }
   mhp_printf( "Breakpoint table full, nothing done\n");
   return 0;
}

int mhp_clearbp(unsigned long seekval)
{
   int i1;
   for (i1=0; i1 < MAXBP; i1++) {
      if (mhpdbgc.brktab[i1].brkaddr == (unsigned char *)seekval) {
         if (i1==trapped_bp) trapped_bp=-1;
         mhpdbgc.brktab[i1].brkaddr = 0;
         return 1;
      }
   }
   return 0;
}

static int check_for_stopped(void)
{
   if (!mhpdbgc.stopped) {
     mhp_printf("need to be in 'stopped' state for this command\n");
     mhp_send();
   }
   return mhpdbgc.stopped;
}

static void mhp_bp(int argc, char * argv[])
{
   unsigned long seekval;
   unsigned int seg;
   unsigned int off;
   unsigned int limit;

   if (!check_for_stopped()) return;
   if (argc < 2) {
      mhp_printf("location argument required\n");
      return;
   }
   seekval = (unsigned long)mhp_getadr(argv[1], &seg, &off, &limit);
   mhp_setbp(seekval);
}

static void mhp_bl(int argc, char * argv[])
{
   int i1;

   mhp_printf( "Breakpoints:\n");
   for (i1=0; i1 < MAXBP; i1++) {
      if (mhpdbgc.brktab[i1].brkaddr) {
         mhp_printf( "%d: %08lx\n", i1, mhpdbgc.brktab[i1].brkaddr);
      }
   }
   mhp_printf( "Interrupts: ");
   for (i1=0; i1 < 256; i1++) {
      if (test_bit(i1, vm86s.vm86plus.vm86dbg_intxxtab)) {
         mhp_printf( "%02x ", i1);
      }
   }
   mhp_printf( "\nDPMI Interrupts:");
   for (i1=0; i1 < 256; i1++) {
     if (dpmi_mhp_intxxtab[i1]) {
       mhp_printf( " %02x", i1);
       if (dpmi_mhp_intxxtab[i1] & 0x80) {
         int i,j=0;
         mhp_printf("[");
         for (i=0; i < axlist_count; i++) {
           if ((mhp_axlist[i] >>16) == i1) {
             if (j)  mhp_printf(",");
             mhp_printf("%x",mhp_axlist[i] & 0xffff);
             j++;
           }
         }
         mhp_printf("]");
       }
     }
   }
   mhp_printf( "\n");
   if (mhpdbgc.bpload) mhp_printf("bpload active\n");
   print_log_breakpoints();
   return;
}

static void mhp_bc(int argc, char * argv[])
{
   int i1;

   if (argc <2) return;
   if (!check_for_stopped()) return;
   if (!sscanf(argv[1], "%d", &i1)) {
     mhp_printf( "Invalid breakpoint number\n");
     return;
   }
   if (!mhpdbgc.brktab[i1].brkaddr) {
         mhp_printf( "No breakpoint %d, nothing done\n", i1);
         return;
   }
   mhpdbgc.brktab[i1].brkaddr = 0;
   return;
}

static void mhp_bpint(int argc, char * argv[])
{
   int i1;

   if (argc <2) return;
   if (!check_for_stopped()) return; 
   sscanf(argv[1], "%x", &i1);
   if (test_bit(i1, vm86s.vm86plus.vm86dbg_intxxtab)) {
         mhp_printf( "Duplicate BPINT %02x, nothing done\n", i1);
         return;
   }
   set_bit(i1, vm86s.vm86plus.vm86dbg_intxxtab);
   if (i1 == 0x21) mhpdbgc.int21_count++;
   return;
}

static void mhp_bcint(int argc, char * argv[])
{
   int i1;

   if (argc <2) return;
   if (!check_for_stopped()) return; 
   sscanf(argv[1], "%x", &i1);
   if (!test_bit(i1, vm86s.vm86plus.vm86dbg_intxxtab)) {
         mhp_printf( "No BPINT %02x, nothing done\n", i1);
         return;
   }
   clear_bit(i1, vm86s.vm86plus.vm86dbg_intxxtab);
   if (i1 == 0x21) mhpdbgc.int21_count--;
   return;
}

static void mhp_bpintd(int argc, char * argv[])
{
   int i1,v1=0;

   if (argc <2) return;
   if (!check_for_stopped()) return; 
   sscanf(argv[1], "%x", &i1);
   i1 &= 0xff;
   if (argc >2) {
     sscanf(argv[2], "%x", &v1);
     v1 = (v1 &0xffff) | (i1<<16);
   }
   if ((!v1 && dpmi_mhp_intxxtab[i1]) || (mhp_getaxlist_value(v1,-1) >=0)) {
     if (v1)  mhp_printf( "Duplicate BPINTD %02x %04x, nothing done\n", i1, v1 & 0xffff);
     else mhp_printf( "Duplicate BPINTD %02x, nothing done\n", i1);
     return;
   }
   if (!dpmi_mhp_intxxtab[i1]) dpmi_mhp_intxxtab[i1]=7;
   if (v1) {
     if (mhp_addaxlist_value(v1)) dpmi_mhp_intxxtab[i1] |= 0x80;
   }
   return;
}

static void mhp_bcintd(int argc, char * argv[])
{
   int i1,v1=0;

   if (argc <2) return;
   if (!check_for_stopped()) return; 
   sscanf(argv[1], "%x", &i1);
   i1 &= 0xff;
   if (argc >2) {
     sscanf(argv[2], "%x", &v1);
     v1 = (v1 &0xffff) | (i1<<16);
   }

   if ((!dpmi_mhp_intxxtab[i1]) || (v1 && (mhp_getaxlist_value(v1,-1) <0))) {
     if (v1)  mhp_printf( "No BPINTD %02x %04x, nothing done\n", i1, v1 & 0xffff);
     else mhp_printf( "No BPINTD %02x, nothing done\n", i1);
     return;
   }
   if (v1) {
     mhp_delaxlist_value(v1,-1);
     if (mhp_getaxlist_value(i1<<16,0xff0000) <0) dpmi_mhp_intxxtab[i1]=0;
   }
   else {
     mhp_delaxlist_value(i1<<16,0xff0000);
     dpmi_mhp_intxxtab[i1]=0;
   }
   return;
}

static void mhp_bpload(int argc, char * argv[])
{
   if (!check_for_stopped()) return; 
   if (mhpdbgc.bpload) {
     mhp_printf("load breakpoint already pending\n");
     return;
   }
   mhpdbgc.bpload=1;
   {
     volatile register int i=0x21; /* beware, set_bit-macro has wrong constraints */
     set_bit(i, vm86s.vm86plus.vm86dbg_intxxtab);
   }
   mhpdbgc.int21_count++;
   return;
}

static void mhp_regs(int argc, char * argv[])
{
  unsigned long newval;
  int i;
  if (argc == 3) {
     if (!mhpdbgc.stopped) {
        mhp_printf("Must be in stopped state\n");
        return;
     }
     sscanf(argv[2], "%lx", &newval);
     i= strlen(argv[1]);
     do  argv[1][i] = toupper(argv[1][i]); while (i--);
     mhp_setreg(argv[1], newval);
     if (newval == mhp_getreg(argv[1]))
        mhp_printf("reg %s changed to %04x\n", argv[1], mhp_getreg(argv[1]) );
     return;
  }
  if (DBG_TYPE(mhpdbgc.currcode) == DBG_INTx)
     mhp_printf( "INT 0x%02X, ", DBG_ARG(mhpdbgc.currcode));
  if (DBG_TYPE(mhpdbgc.currcode) == DBG_INTxDPMI)
     mhp_printf( "INT 0x%02X in DPMI, ", DBG_ARG(mhpdbgc.currcode) & 0xff);
  if (DBG_TYPE(mhpdbgc.currcode) == DBG_TRAP) {
     if (DBG_ARG(mhpdbgc.currcode)==1) mhp_printf( "Trap %d, ", DBG_ARG(mhpdbgc.currcode));
     else {
       if (mhpdbgc.bpload_bp==3) {
         mhpdbgc.bpload_bp=0;
         mhp_printf("At entry of program %s\n", mhpdbgc.bpload_cmd);
         if (mhpdbgc.bpload_cmdline[0]) {
           mhpdbgc.bpload_cmdline[mhpdbgc.bpload_cmdline[0]+1]=0;
           mhp_printf("command line: %s\n", mhpdbgc.bpload_cmdline+1);
         }
         else mhp_printf(" (empty command line)\n");
       }
       else mhp_printf( "Trap %d, ", DBG_ARG(mhpdbgc.currcode));
     }
  }
  if (DBG_TYPE(mhpdbgc.currcode) == DBG_GPF)
     mhp_printf( "General Protection Fault, ");

 if (!traceloop)
  mhp_printf( "system state: %s%s%s%s\n",
#ifdef X86_EMULATOR
       config.cpuemu > 1 ? "emulated," : "",
#else
       "",
#endif
       mhpdbgc.stopped ? "stopped" : "running",
       IN_DPMI ? " in DPMI" : (in_dpmi?" in real mode while in DPMI":""),
       IN_DPMI ?(dpmi_mhp_getcsdefault()?"-32bit":"-16bit") : "");

  if (!dpmi_mhp_regs()) {
    mhp_printf("AX=%04x  BX=%04x  CX=%04x  DX=%04x",
                LWORD(eax), LWORD(ebx), LWORD(ecx), LWORD(edx));
    mhp_printf("  SI=%04x  DI=%04x  SP=%04x  BP=%04x",
                LWORD(esi), LWORD(edi), LWORD(esp), LWORD(ebp));
    mhp_printf("\nDS=%04x  ES=%04x  FS=%04x  GS=%04x  FL=%04x",
                LWORD(ds), LWORD(es), LWORD(fs), LWORD(gs), LWORD(eflags));
    mhp_printf("\nCS:IP=%04x:%04x       SS:SP=%04x:%04x\n",
                LWORD(cs), LWORD(eip), LWORD(ss), LWORD(esp));
  }
  mhp_cmd("u * 1");
}

static void mhp_regs32(int argc, char * argv[])
{
  if (DBG_TYPE(mhpdbgc.currcode) == DBG_INTx)
     mhp_printf( "\nInterrupt 0x%02X", DBG_ARG(mhpdbgc.currcode));
  if (DBG_TYPE(mhpdbgc.currcode) == DBG_TRAP)
     mhp_printf( "\nTrap 0x%02X", DBG_ARG(mhpdbgc.currcode));
  if (DBG_TYPE(mhpdbgc.currcode) == DBG_GPF)
     mhp_printf( "\nGeneral Protection Fault");

  mhp_printf("\nEAX: %08lx EBX: %08lx ECX: %08lx EDX: %08lx VFLAGS(h): %08lx",
              REG(eax), REG(ebx), REG(ecx), REG(edx), (unsigned long)vflags);

  mhp_printf("\nESI: %08lx EDI: %08lx EBP: %08lx",
              REG(esi), REG(edi), REG(ebp));

  mhp_printf(" DS: %04x ES: %04x FS: %04x GS: %04x\n",
              LWORD(ds), LWORD(es), LWORD(fs), LWORD(gs));

  mhp_printf(" CS: %04x IP: %04x SS: %04x SP: %04x\n",
              LWORD(cs), LWORD(eip), LWORD(ss), LWORD(esp));
}

static void mhp_kill(int argc, char * argv[])
{
  mhp_cmd("r0");
  mhp_printf("\ndosemu killed via debug terminal\n");
  mhp_send();
#if 0
  mhp_putc(1); /* tell debugger terminal to also quit */
  mhp_send();
#endif
  mhp_close();
  if (dosdebug_flags & DBGF_IN_LEAVEDOS) dosdebug_flags &= ~DBGF_IN_LEAVEDOS;
  else leavedos(1);
}

static void mhp_help(int argc, char * argv[])
{
  mhp_printf("%s\n",help_page);
}

void mhp_bpset(void)
{
   int i1;
   dpmimode=saved_dpmimode;

   for (i1=0; i1 < MAXBP; i1++) {
      if (mhpdbgc.brktab[i1].brkaddr) {
         if (mhpdbgc.brktab[i1].is_dpmi && !in_dpmi) {
           mhpdbgc.brktab[i1].brkaddr = 0;
           mhp_printf("Warning: cleared breakpoint %d because not in DPMI\n",i1);
           continue;
         }
         mhpdbgc.brktab[i1].opcode = *mhpdbgc.brktab[i1].brkaddr;
         if (i1!=trapped_bp) *mhpdbgc.brktab[i1].brkaddr = 0xCC;
      }
   }
   return;
}

void mhp_bpclr(void)
{
   int i1;

   for (i1=0; i1 < MAXBP; i1++) {
      if (mhpdbgc.brktab[i1].brkaddr) {
         if (mhpdbgc.brktab[i1].is_dpmi && !in_dpmi) {
           mhpdbgc.brktab[i1].brkaddr = 0;
           mhp_printf("Warning: cleared breakpoint %d because not in DPMI\n",i1);
           continue;
         }
         if( (*mhpdbgc.brktab[i1].brkaddr) != 0xCC) {
            if (i1!=trapped_bp) mhpdbgc.brktab[i1].brkaddr = 0;
            continue;
         }
         *mhpdbgc.brktab[i1].brkaddr = mhpdbgc.brktab[i1].opcode;
      }
   }
   saved_dpmimode=dpmimode;
   return;
}


int mhp_bpchk(unsigned char * a1)
{
   int i1;

   for (i1=0; i1 < MAXBP; i1++) {
      if (mhpdbgc.brktab[i1].brkaddr == a1) {
        dpmimode=mhpdbgc.brktab[i1].is_dpmi;
        trapped_bp_=i1;
        trapped_bp=-2;
        return 1;
      }
   }
   return 0;
}

int mhp_getcsip_value()
{
  int  seg, off, limit;
  if (IN_DPMI) return (int)mhp_getadr("cs:eip", &seg, &off, &limit);
  else return (LWORD(cs) << 4) + LWORD(eip);
}

void mhp_modify_eip(int delta)
{
  if (IN_DPMI) dpmi_mhp_modify_eip(delta);
  else LWORD(eip) +=delta;
}


void mhp_cmd(const char * cmd)
{
   call_cmd(cmd, MAXARG, cmdtab, mhp_printf);
}

static void mhp_print_ldt(int argc, char * argv[])
{
  static char buffer[0x10000];
  unsigned long *lp, *lp_=(unsigned long *)ldt_buffer;
  unsigned long base_addr, limit;
  int type, type2, i;
  unsigned int seg;
  int lines=0, cache_mismatch;
  enum{Abit=0x100};

  if (get_ldt(buffer) < 0) {
    mhp_printf("error getting ldt\n");
    return;
  }

  if (argc > 1) {
     if (IN_DPMI && isalpha(argv[1][0])) {
       int rnum=decode_symreg(argv[1]);
       if (rnum <0) {
         mhp_printf("wrong register name\n");
         return;
       }
       seg=dpmi_mhp_getreg(rnum);
       sprintf(lastldt, "%x", seg);
       lines=1;
     }
     else {
       sscanf (argv[1], "%x", &seg);
       strcpy(lastldt, argv[1]);
     }
  } else {
     if (!strlen(lastldt)) {
        seg=0;
     }
     sscanf (lastldt, "%x", &seg);
  }
  if (!lines || (argc > 2) ) {
    if (argc > 2) sscanf (argv[2], "%d", &lines);
    else lines = 16;
  }

  lp = (unsigned long *) buffer;
  lp += (seg & 0xFFF8) >> 2;
  lp_ += (seg & 0xFFF8) >> 2;
  
  for (i=(seg & 0xFFF8); i< 0x10000; i+=8,lp++, lp_+=2) {
    cache_mismatch = (lp[0] != lp_[0]) || ((lp[1]|Abit) != (lp_[1]|Abit));
    if ((lp[0] && lp[1]) ||  cache_mismatch) {
        if (--lines <0) break;
        base_addr = (*lp >> 16) & 0x0000FFFF;
        limit = *lp & 0x0000FFFF;
        lp++;
        /* Second 32 bits of descriptor */
        base_addr |= (*lp & 0xFF000000) | ((*lp << 16) & 0x00FF0000);
        limit |= (*lp & 0x000F0000);
        type = (*lp >> 8)  & 0x000000FF;
        type2= (*lp >> 20) & 0x0000000F;
        if (type2 & 0x08)
           limit *= 4096;
        if (type & 0x10)
           mhp_printf ("%04x: %08lx %08lx %s%d %d %c%c%c%c%c%s\n",
              i | 0x07,
              base_addr,
              limit,
              (type & 0x08) ? "Code" : "Data",
              (type2 & 0x04) ? 32 : 16,
              (type >> 5) & 0x03,
              (type >> 7) ? 'P' : ' ',
              (type & 4)?((type & 8)?'C':'E'):' ',
              (type & 2)?((type & 8)?'R':'W'):' ',
              (type & 1)?'A':' ',
              (lp_[1] &Abit)?'a':' ',
              cache_mismatch ?" (cache mismatch)":"");
        else
           mhp_printf ("%04x: %08lx %08lx System(%02x)%s\n",
              i, base_addr, limit, type,
              cache_mismatch ?" (cache mismatch)":"");
    }
    else lp++;
  }
  sprintf (lastldt, "%x", i);
}

static void mhp_debuglog(int argc, char * argv[])
{
   char buf[256];
   if (argc >1) {
     if (!strcmp(argv[1], "on")) {
       dosdebug_flags |= DBGF_INTERCEPT_LOG | DBGF_LOG_TO_DOSDEBUG;
       return;
     }
     if (!strcmp(argv[1], "off")) {
       dosdebug_flags &= ~DBGF_LOG_TO_DOSDEBUG;
       if (!(dosdebug_flags & DBGF_LOG_TO_BREAK))
         dosdebug_flags &= ~DBGF_INTERCEPT_LOG;
       return;
     }
     SetDebugFlagsHelper(argv[1]);
   }
   if (argc <=1) {
     GetDebugFlagsHelper(buf, 0);
     mhp_printf ("current Debug-log flags:\n%s\n", buf);
   }
}

#define MAX_REGEX		8
static regex_t *rxbuf[MAX_REGEX] = {0};
static char *rxpatterns[MAX_REGEX] = {0};
static int num_regex = 0;
static int num_logbp = 0;

static int get_free_regex_buf(void)
{
  int i;
  for (i=0; i <num_regex; i++) {
    if (!rxbuf[i]) return i;
  }
  if (num_regex >= MAX_REGEX) return -1;
  i = num_regex;
  num_regex++;
  rxbuf[i] = 0;
  rxpatterns[i] =0;
  return i;
}

static void free_regex(int number)
{
  if ((unsigned)number >= MAX_REGEX) return;
  if (!rxbuf[number]) return;
  regfree(rxbuf[number]);
  if (rxpatterns[number]) free(rxpatterns[number]);
  free(rxbuf[number]);
  rxbuf[number] = 0;
  rxpatterns[number] = 0;
}

static char *trimm_string_arg(char *arg)
{
  int len;

  if (!arg || !arg[0]) return 0;
  len = strlen(arg);
  if (     (arg[0] == '"' && arg[len-1] == '"')
        || (arg[0] == '\'' && arg[len-1] == '\'')) {
    arg[len-1] = 0;
    return arg+1;
  }
  return arg;
}

static void print_log_breakpoints(void)
{
   int rx;

   num_logbp = 0;
   for (rx=0; rx <num_regex; rx++) {
     if (rxbuf[rx]) {
       mhp_printf("log breakpoint %d: %s\n", rx, rxpatterns[rx]);
       mhp_send();
       num_logbp++;
     }
   }
   if (!num_logbp) {
     mhp_printf("no log breakpoint active\n");
   }
}


static void mhp_bplog(int argc, char * argv[])
{
   int rx, errcode;
   char buf[1024];
   char *s;

   if (argc >1) {
     if (!check_for_stopped()) return; 
     argv++;
     buf[0] = 0;
     while (*argv) {
       s = trimm_string_arg(*argv);
       if (s) strcat(buf, s);
       argv++;
     }
     if (!buf[0]) {
       mhp_printf ("no valid regular expression defined\n");
       return;
     }
     rx = get_free_regex_buf();
     if (rx <0) {
       mhp_printf ("to many log breakpoints, use bclog to free one\n");
       return;
     }
     rxpatterns[rx] = strdup(buf);
     rxbuf[rx] = malloc(sizeof(regex_t));
     if (!rxbuf[rx]) {
       mhp_printf ("out of memory\n");
       return;
     }
     errcode = regcomp(rxbuf[rx], rxpatterns[rx], REG_NOSUB);
     if (errcode) {
        regerror(errcode, rxbuf[rx], buf, sizeof(buf));
        mhp_printf ("%s\n", buf);
        free_regex(rx);
        return;
     }
     /* ...puh, all that work just for generating a pattern :-)
      * now we enable the 'break point' by intercepting the log
      */
     dosdebug_flags |= DBGF_INTERCEPT_LOG | DBGF_LOG_TO_BREAK;
   }
   /* atleast print all active brakepoints */
   print_log_breakpoints();
}

static void mhp_bclog(int argc, char * argv[])
{
   int rx;

   if (argc >1) {
     if (!check_for_stopped()) return;
     rx = atoi(argv[1]);
     if (((unsigned)rx >= MAX_REGEX) || !rxbuf[rx]) {
       mhp_printf("log break point not existing\n", rx);
       return;
     }
     free_regex(rx);
   }
   print_log_breakpoints();
   if (!num_logbp) {
     dosdebug_flags &= ~DBGF_LOG_TO_BREAK;
     if (!(dosdebug_flags & DBGF_LOG_TO_DOSDEBUG)) {
       dosdebug_flags &= DBGF_INTERCEPT_LOG;
     }
   }
}

static int mhp_check_regex(char *line)
{
   int rx, hit;
   if (!num_logbp) return 0;  /* we should not come here */
   for (rx=0; rx <num_regex; rx++) {
     if (rxbuf[rx]) {
       hit = regexec(rxbuf[rx], line, 0, 0, 0) == 0;
       if (hit) {
         mhp_printf("log break point %d hit: >%s<\n",rx,line);
         mhp_send();
       }
       if (hit) return 1;
     }
   }
   return 0;
}

static char lbuf[1024];
static int lbufi = 0;

void mhp_regex(const char *fmt, va_list args)
{
  int i, hit;
  char *s;
  
  if (!(dosdebug_flags & DBGF_LOG_TO_BREAK)) return;
  lbufi += vsprintf(lbuf+lbufi, fmt, args);
  hit = 0;
  i = 0;
  do {
    s = strchr(lbuf+i, '\n');
    if (s) {
      *s = 0;
      hit = mhp_check_regex(lbuf+i);
      i = (s - lbuf)+1;
      if (hit) break;
    }
  } while (s);
  if (i) {
    memcpy(lbuf, lbuf+i, lbufi-i+1);
    lbufi -= i;
    if (hit) {
      mhpdbgc.want_to_stop = 1;
    }
  }
}