usr.bin/doscmd/debug.c

   1 /*
   2  * Copyright (c) 1996
   3  *      Michael Smith, All rights reserved.
   4  * Copyright (c) 1992, 1993, 1996
   5  *      Berkeley Software Design, Inc.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by Berkeley Software
  18  *      Design, Inc.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL Berkeley Software Design, Inc. BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * from: BSDI doscmd.c,v 2.3 1996/04/08 19:32:30 bostic Exp
  33  *
  34  * $FreeBSD: src/usr.bin/doscmd/debug.c,v 1.3.2.2 2002/04/25 11:04:50 tg Exp $
  35  * $DragonFly: src/usr.bin/doscmd/debug.c,v 1.2 2003/06/17 04:29:25 dillon Exp $
  36  */
  37
  38 #include <stdarg.h>
  39
  40 #include "doscmd.h"
  41 #include "tty.h"
  42
  43 /* debug output goes here */
  44 FILE *debugf;
  45
  46 /* see doscmd.h for flag names */
  47 int debug_flags = D_ALWAYS;
  48
  49 /* include register dumps when reporting unknown interrupts */
  50 int vflag = 0;
  51
  52 /* interrupts to trace */
  53 #define BPW     (sizeof(u_long) << 3)
  54 u_long debug_ints[256/BPW];
  55
  56 /* Debug flag manipulation */
  57 void
  58 debug_set(int x)
  59 {
  60     x &= 0xff;
  61     debug_ints[x/BPW] |= 1 << (x & (BPW - 1));
  62 }
  63
  64 void
  65 debug_unset(int x)
  66 {
  67     x &= 0xff;
  68     debug_ints[x/BPW] &= ~(1 << (x & (BPW - 1)));
  69 }
  70
  71 u_long
  72 debug_isset(int x)
  73 {
  74     x &= 0xff;
  75     return(debug_ints[x/BPW] & (1 << (x & (BPW - 1))));
  76 }
  77
  78
  79 /*
  80 ** Emit a debugging message if (flags) matches the current
  81 ** debugging mode.
  82 */
  83 void
  84 debug(int flags, const char *fmt, ...)
  85 {
  86     va_list args;
  87
  88     if (flags & (debug_flags & ~0xff)) {
  89         if ((debug_flags & 0xff) == 0
  90             && (flags & (D_ITRAPS | D_TRAPS))
  91             && !debug_isset(flags & 0xff))
  92             return;
  93         va_start (args, fmt);
  94         vfprintf (debugf, fmt, args);
  95         va_end (args);
  96     }
  97 }
  98
  99 /*
 100 ** Emit a terminal error message and exit
 101 */
 102 void
 103 fatal(const char *fmt, ...)
 104 {
 105     va_list args;
 106
 107     dead = 1;
 108
 109     if (xmode) {
 110         char buf[1024];
 111         const char *m;
 112
 113         va_start (args, fmt);
 114         vfprintf (debugf, fmt, args);
 115         vsprintf (buf, fmt, args);
 116         va_end (args);
 117
 118         tty_move(23, 0);
 119         for (m = buf; *m; ++m)
 120             tty_write(*m, 0x0400);
 121
 122         tty_move(24, 0);
 123         for (m = "(PRESS <CTRL-ALT> ANY MOUSE BUTTON TO exit)"; *m; ++m)
 124             tty_write(*m, 0x0900);
 125         tty_move(-1, -1);
 126         for (;;)
 127             tty_pause();
 128     }
 129
 130     va_start (args, fmt);
 131     fprintf (debugf, "doscmd: fatal error ");
 132     vfprintf (debugf, fmt, args);
 133     va_end (args);
 134     quit (1);
 135 }
 136
 137 /*
 138 ** Emit a register dump (usually when dying)
 139 */
 140 void
 141 dump_regs(regcontext_t *REGS)
 142 {
 143     u_char      *addr;
 144     int         i;
 145     char        buf[100];
 146
 147     debug (D_ALWAYS, "\n");
 148     debug (D_ALWAYS, "ax=%04x bx=%04x cx=%04x dx=%04x\n", R_AX, R_BX, R_CX, R_DX);
 149     debug (D_ALWAYS, "si=%04x di=%04x sp=%04x bp=%04x\n", R_SI, R_DI, R_SP, R_BP);
 150     debug (D_ALWAYS, "cs=%04x ss=%04x ds=%04x es=%04x\n", R_CS, R_SS, R_DS, R_ES);
 151     debug (D_ALWAYS, "ip=%x eflags=%lx\n", R_IP, R_EFLAGS);
 152
 153     addr = (u_char *)MAKEPTR(R_CS, R_IP);
 154
 155     for (i = 0; i < 16; i++)
 156         debug (D_ALWAYS, "%02x ", addr[i]);
 157     debug (D_ALWAYS, "\n");
 158
 159     addr = (char *)MAKEPTR(R_CS, R_IP);
 160     i386dis(R_CS, R_IP, addr, buf, 0);
 161
 162     debug (D_ALWAYS, "%s\n", buf);
 163 }
 164
 165 /*
 166 ** Unknown interrupt error messages
 167 */
 168 void
 169 unknown_int2(int maj, int min, regcontext_t *REGS)
 170 {
 171     if (vflag) dump_regs(REGS);
 172     printf("Unknown interrupt %02x function %02x\n", maj, min);
 173     R_FLAGS |= PSL_C;
 174 }
 175
 176 void
 177 unknown_int3(int maj, int min, int sub, regcontext_t *REGS)
 178 {
 179     if (vflag) dump_regs(REGS);
 180     printf("Unknown interrupt %02x function %02x subfunction %02x\n",
 181            maj, min, sub);
 182     R_FLAGS |= PSL_C;
 183 }
 184
 185 void
 186 unknown_int4(int maj, int min, int sub, int ss, regcontext_t *REGS)
 187 {
 188     if (vflag) dump_regs(REGS);
 189     printf("Unknown interrupt %02x function %02x subfunction %02x %02x\n",
 190            maj, min, sub, ss);
 191     R_FLAGS |= PSL_C;
 192 }
 193