programs/winedbg/registers.c

   1 /*
   2  * Debugger register handling
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "config.h"
  22 #include <string.h>
  23 #include "debugger.h"
  24
  25 /***********************************************************************
  26  *           DEBUG_Flags
  27  *
  28  * Return Flag String.
  29  */
  30 static char *DEBUG_Flags( DWORD flag, char *buf )
  31 {
  32 #ifdef __i386__
  33     char *pt;
  34
  35     strcpy( buf, "   - 00      - - - " );
  36     pt = buf + strlen( buf );
  37     if ( buf >= pt-- ) return( buf );
  38     if ( flag & 0x00000001 ) *pt = 'C'; /* Carry Falg */
  39     if ( buf >= pt-- ) return( buf );
  40     if ( flag & 0x00000002 ) *pt = '1';
  41     if ( buf >= pt-- ) return( buf );
  42     if ( flag & 0x00000004 ) *pt = 'P'; /* Parity Flag */
  43     if ( buf >= pt-- ) return( buf );
  44     if ( flag & 0x00000008 ) *pt = '-';
  45     if ( buf >= pt-- ) return( buf );
  46     if ( flag & 0x00000010 ) *pt = 'A'; /* Auxiliary Carry Flag */
  47     if ( buf >= pt-- ) return( buf );
  48     if ( flag & 0x00000020 ) *pt = '-';
  49     if ( buf >= pt-- ) return( buf );
  50     if ( flag & 0x00000040 ) *pt = 'Z'; /* Zero Flag */
  51     if ( buf >= pt-- ) return( buf );
  52     if ( flag & 0x00000080 ) *pt = 'S'; /* Sign Flag */
  53     if ( buf >= pt-- ) return( buf );
  54     if ( flag & 0x00000100 ) *pt = 'T'; /* Trap/Trace Flag */
  55     if ( buf >= pt-- ) return( buf );
  56     if ( flag & 0x00000200 ) *pt = 'I'; /* Interupt Enable Flag */
  57     if ( buf >= pt-- ) return( buf );
  58     if ( flag & 0x00000400 ) *pt = 'D'; /* Direction Indicator */
  59     if ( buf >= pt-- ) return( buf );
  60     if ( flag & 0x00000800 ) *pt = 'O'; /* Overflow Flag */
  61     if ( buf >= pt-- ) return( buf );
  62     if ( flag & 0x00001000 ) *pt = '1'; /* I/O Privilege Level */
  63     if ( buf >= pt-- ) return( buf );
  64     if ( flag & 0x00002000 ) *pt = '1'; /* I/O Privilege Level */
  65     if ( buf >= pt-- ) return( buf );
  66     if ( flag & 0x00004000 ) *pt = 'N'; /* Nested Task Flag */
  67     if ( buf >= pt-- ) return( buf );
  68     if ( flag & 0x00008000 ) *pt = '-';
  69     if ( buf >= pt-- ) return( buf );
  70     if ( flag & 0x00010000 ) *pt = 'R'; /* Resume Flag */
  71     if ( buf >= pt-- ) return( buf );
  72     if ( flag & 0x00020000 ) *pt = 'V'; /* Vritual Mode Flag */
  73     if ( buf >= pt-- ) return( buf );
  74     if ( flag & 0x00040000 ) *pt = 'a'; /* Alignment Check Flag */
  75     if ( buf >= pt-- ) return( buf );
  76     return( buf );
  77 #else
  78     strcpy(buf, "unknown CPU");
  79     return buf;
  80 #endif
  81 }
  82
  83
  84 /***********************************************************************
  85  *           DEBUG_InfoRegisters
  86  *
  87  * Display registers information.
  88  */
  89 void DEBUG_InfoRegisters(const CONTEXT* ctx)
  90 {
  91     DEBUG_Printf("Register dump:\n");
  92
  93 #ifdef __i386__
  94     /* First get the segment registers out of the way */
  95     DEBUG_Printf(" CS:%04x SS:%04x DS:%04x ES:%04x FS:%04x GS:%04x",
  96                  (WORD)ctx->SegCs, (WORD)ctx->SegSs,
  97                  (WORD)ctx->SegDs, (WORD)ctx->SegEs,
  98                  (WORD)ctx->SegFs, (WORD)ctx->SegGs);
  99     if (DEBUG_CurrThread->dbg_mode != MODE_32)
 100     {
 101         char flag[33];
 102
 103         DEBUG_Printf("\n IP:%04x SP:%04x BP:%04x FLAGS:%04x(%s)\n",
 104                      LOWORD(ctx->Eip), LOWORD(ctx->Esp),
 105                      LOWORD(ctx->Ebp), LOWORD(ctx->EFlags),
 106                      DEBUG_Flags(LOWORD(ctx->EFlags), flag));
 107         DEBUG_Printf(" AX:%04x BX:%04x CX:%04x DX:%04x SI:%04x DI:%04x\n",
 108                      LOWORD(ctx->Eax), LOWORD(ctx->Ebx),
 109                      LOWORD(ctx->Ecx), LOWORD(ctx->Edx),
 110                      LOWORD(ctx->Esi), LOWORD(ctx->Edi));
 111     }
 112     else  /* 32-bit mode */
 113     {
 114         char flag[33];
 115
 116         DEBUG_Printf("\n EIP:%08lx ESP:%08lx EBP:%08lx EFLAGS:%08lx(%s)\n",
 117                      ctx->Eip, ctx->Esp,
 118                      ctx->Ebp, ctx->EFlags,
 119                      DEBUG_Flags(ctx->EFlags, flag));
 120         DEBUG_Printf(" EAX:%08lx EBX:%08lx ECX:%08lx EDX:%08lx\n",
 121                      ctx->Eax, ctx->Ebx,
 122                      ctx->Ecx, ctx->Edx );
 123         DEBUG_Printf(" ESI:%08lx EDI:%08lx\n",
 124                      ctx->Esi, ctx->Edi );
 125     }
 126 #endif
 127 }
 128
 129
 130 /***********************************************************************
 131  *           DEBUG_ValidateRegisters
 132  *
 133  * Make sure all registers have a correct value for returning from
 134  * the signal handler.
 135  */
 136 BOOL DEBUG_ValidateRegisters(void)
 137 {
 138    DBG_ADDR     addr;
 139    char         ch;
 140
 141 #ifdef __i386__
 142     if (DEBUG_context.EFlags & V86_FLAG) return TRUE;
 143
 144 #if 0
 145 /* Check that a selector is a valid ring-3 LDT selector, or a NULL selector */
 146 #define CHECK_SEG(seg,name) \
 147     if (((seg) & ~3) && ((((seg) & 7) != 7) || !DEBUG_IsSelector(seg))) { \
 148         DEBUG_Printf("*** Invalid value for %s register: %04x\n", \
 149                      (name), (WORD)(seg) ); \
 150         return FALSE; \
 151     }
 152
 153     cs = __get_cs();
 154     ds = __get_ds();
 155     if (DEBUG_context.SegCs != cs) CHECK_SEG(DEBUG_context.SegCs, "CS");
 156     if (DEBUG_context.SegSs != ds) CHECK_SEG(DEBUG_context.SegSs, "SS");
 157     if (DEBUG_context.SegDs != ds) CHECK_SEG(DEBUG_context.SegDs, "DS");
 158     if (DEBUG_context.SegEs != ds) CHECK_SEG(DEBUG_context.SegEs, "ES");
 159     if (DEBUG_context.SegFs != ds) CHECK_SEG(DEBUG_context.SegFs, "FS");
 160     if (DEBUG_context.SegGs != ds) CHECK_SEG(DEBUG_context.SegGs, "GS");
 161 #endif
 162
 163     /* Check that CS and SS are not NULL */
 164
 165     if (!(DEBUG_context.SegCs & ~3))
 166     {
 167         DEBUG_Printf("*** Invalid value for CS register: %04x\n",
 168                      (WORD)DEBUG_context.SegCs );
 169         return FALSE;
 170     }
 171     if (!(DEBUG_context.SegSs & ~3))
 172     {
 173         DEBUG_Printf("*** Invalid value for SS register: %04x\n",
 174                      (WORD)DEBUG_context.SegSs );
 175         return FALSE;
 176     }
 177
 178 #undef CHECK_SEG
 179 #else
 180     /* to be written */
 181 #endif
 182
 183     /* check if PC is correct */
 184     DEBUG_GetCurrentAddress(&addr);
 185     return DEBUG_READ_MEM_VERBOSE((void*)DEBUG_ToLinear(&addr), &ch, 1);
 186 }