debugger/memory.c

   1 /*
   2  * Debugger memory handling
   3  *
   4  * Copyright 1993 Eric Youngdale
   5  * Copyright 1995 Alexandre Julliard
   6  * Copyright 2000 Eric Pouech
   7  */
   8
   9 #include "config.h"
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13
  14 #include "debugger.h"
  15 #include "miscemu.h"
  16 #include "winbase.h"
  17
  18 #ifdef __i386__
  19 #include "wine/winbase16.h"
  20
  21 #define DBG_V86_MODULE(seg) ((seg)>>16)
  22 #define IS_SELECTOR_V86(seg) DBG_V86_MODULE(seg)
  23
  24 static  void    DEBUG_Die(const char* msg)
  25 {
  26    fprintf(stderr, msg);
  27    exit(1);
  28 }
  29
  30 void*   DEBUG_XMalloc(size_t size)
  31 {
  32    void *res = malloc(size ? size : 1);
  33    if (res == NULL)
  34       DEBUG_Die("Memory exhausted.\n");
  35    memset(res, 0, size);
  36    return res;
  37 }
  38
  39 void* DEBUG_XReAlloc(void *ptr, size_t size)
  40 {
  41    void* res = realloc(ptr, size);
  42    if ((res == NULL) && size)
  43       DEBUG_Die("Memory exhausted.\n");
  44    return res;
  45 }
  46
  47 char*   DEBUG_XStrDup(const char *str)
  48 {
  49    char *res = strdup(str);
  50    if (!res)
  51       DEBUG_Die("Memory exhausted.\n");
  52    return res;
  53 }
  54
  55 void DEBUG_FixAddress( DBG_ADDR *addr, DWORD def)
  56 {
  57    if (addr->seg == 0xffffffff) addr->seg = def;
  58    if (!IS_SELECTOR_V86(addr->seg) && DEBUG_IsSelectorSystem(addr->seg)) addr->seg = 0;
  59 }
  60
  61 BOOL  DEBUG_FixSegment( DBG_ADDR* addr )
  62 {
  63    /* V86 mode ? */
  64    if (DEBUG_context.EFlags & V86_FLAG) {
  65       addr->seg |= (DWORD)(GetExePtr(GetCurrentTask())) << 16;
  66       return TRUE;
  67    }
  68    return FALSE;
  69 }
  70
  71 DWORD DEBUG_ToLinear( const DBG_ADDR *addr )
  72 {
  73    LDT_ENTRY    le;
  74
  75    if (IS_SELECTOR_V86(addr->seg))
  76       return (DWORD) DOSMEM_MemoryBase(DBG_V86_MODULE(addr->seg)) + (((addr->seg)&0xFFFF)<<4) + addr->off;
  77    if (DEBUG_IsSelectorSystem(addr->seg))
  78       return addr->off;
  79
  80    if (GetThreadSelectorEntry( DEBUG_CurrThread->handle, addr->seg, &le)) {
  81       return (le.HighWord.Bits.BaseHi << 24) + (le.HighWord.Bits.BaseMid << 16) + le.BaseLow + addr->off;
  82    }
  83    return 0;
  84 }
  85
  86 int     DEBUG_GetSelectorType( WORD sel )
  87 {
  88     LDT_ENTRY   le;
  89
  90     if (sel == 0)
  91         return 32;
  92     if (IS_SELECTOR_V86(sel))
  93         return 16;
  94     if (GetThreadSelectorEntry( DEBUG_CurrThread->handle, sel, &le))
  95         return le.HighWord.Bits.Default_Big ? 32 : 16;
  96          /* selector doesn't exist */
  97     return 0;
  98 }
  99
 100 /* Determine if sel is a system selector (i.e. not managed by Wine) */
 101 BOOL    DEBUG_IsSelectorSystem(WORD sel)
 102 {
 103    return !(sel & 4) || (((sel & 0xFFFF) >> 3) < 17);
 104 }
 105 #endif /* __i386__ */
 106
 107 void DEBUG_GetCurrentAddress( DBG_ADDR *addr )
 108 {
 109 #ifdef __i386__
 110     addr->seg  = DEBUG_context.SegCs;
 111
 112     if (!DEBUG_FixSegment( addr ) && DEBUG_IsSelectorSystem(addr->seg))
 113        addr->seg = 0;
 114     addr->off  = DEBUG_context.Eip;
 115 #else
 116     addr->seg  = 0;
 117     addr->off  = 0;
 118 #endif
 119 }
 120
 121 void    DEBUG_InvalLinAddr( void* addr )
 122 {
 123    DBG_ADDR address;
 124
 125    address.seg = 0;
 126    address.off = (unsigned long)addr;
 127
 128    fprintf(stderr,"*** Invalid address ");
 129    DEBUG_PrintAddress(&address, DEBUG_CurrThread->dbg_mode, FALSE);
 130    fprintf(stderr,"\n");
 131 }
 132
 133 /***********************************************************************
 134  *           DEBUG_ReadMemory
 135  *
 136  * Read a memory value.
 137  */
 138 int DEBUG_ReadMemory( const DBG_ADDR *address )
 139 {
 140     DBG_ADDR    addr = *address;
 141     void*       lin;
 142     int         value;
 143
 144     DEBUG_FixAddress( &addr, DEBUG_context.SegDs );
 145     lin = (void*)DEBUG_ToLinear( &addr );
 146     if (!DEBUG_READ_MEM_VERBOSE(lin, &value, sizeof(value)))
 147        value = 0;
 148     return value;
 149 }
 150
 151
 152 /***********************************************************************
 153  *           DEBUG_WriteMemory
 154  *
 155  * Store a value in memory.
 156  */
 157 void DEBUG_WriteMemory( const DBG_ADDR *address, int value )
 158 {
 159     DBG_ADDR    addr = *address;
 160     void*       lin;
 161
 162     DEBUG_FixAddress( &addr, DEBUG_context.SegDs );
 163     lin = (void*)DEBUG_ToLinear( &addr );
 164     DEBUG_WRITE_MEM_VERBOSE(lin, &value, sizeof(value));
 165 }
 166
 167
 168 /***********************************************************************
 169  *           DEBUG_ExamineMemory
 170  *
 171  * Implementation of the 'x' command.
 172  */
 173 void DEBUG_ExamineMemory( const DBG_VALUE *_value, int count, char format )
 174 {
 175     DBG_VALUE             value = *_value;
 176     int                   i;
 177     unsigned char       * pnt;
 178     struct datatype     * testtype;
 179
 180     assert(_value->cookie == DV_TARGET || _value->cookie == DV_HOST);
 181
 182     DEBUG_FixAddress( &value.addr,
 183                       (format == 'i') ?
 184                       DEBUG_context.SegCs :
 185                       DEBUG_context.SegDs );
 186
 187     /*
 188      * Dereference pointer to get actual memory address we need to be
 189      * reading.  We will use the same segment as what we have already,
 190      * and hope that this is a sensible thing to do.
 191      */
 192     if( value.type != NULL )
 193       {
 194         if( value.type == DEBUG_TypeIntConst )
 195           {
 196             /*
 197              * We know that we have the actual offset stored somewhere
 198              * else in 32-bit space.  Grab it, and we
 199              * should be all set.
 200              */
 201             unsigned int  seg2 = value.addr.seg;
 202             value.addr.seg = 0;
 203             value.addr.off = DEBUG_GetExprValue(&value, NULL);
 204             value.addr.seg = seg2;
 205           }
 206         else
 207           {
 208             if (DEBUG_TypeDerefPointer(&value, &testtype) == 0)
 209               return;
 210             if( testtype != NULL || value.type == DEBUG_TypeIntConst )
 211               {
 212                 value.addr.off = DEBUG_GetExprValue(&value, NULL);
 213               }
 214           }
 215       }
 216     else if (!value.addr.seg && !value.addr.off)
 217     {
 218         fprintf(stderr,"Invalid expression\n");
 219         return;
 220     }
 221
 222     if (format != 'i' && count > 1)
 223     {
 224         DEBUG_PrintAddress( &value.addr, DEBUG_CurrThread->dbg_mode, FALSE );
 225         fprintf(stderr,": ");
 226     }
 227
 228     pnt = (void*)DEBUG_ToLinear( &value.addr );
 229
 230     switch(format)
 231     {
 232         case 'u': {
 233                 WCHAR wch;
 234                 if (count == 1) count = 256;
 235                 while (count--)
 236                 {
 237                     if (!DEBUG_READ_MEM_VERBOSE(pnt, &wch, sizeof(wch)))
 238                        break;
 239                     pnt += sizeof(wch);
 240                     fputc( (char)wch, stderr );
 241                 }
 242                 fprintf(stderr,"\n");
 243                 return;
 244             }
 245           case 's': {
 246                 char ch;
 247
 248                 if (count == 1) count = 256;
 249                 while (count--)
 250                 {
 251                     if (!DEBUG_READ_MEM_VERBOSE(pnt, &ch, sizeof(ch)))
 252                        break;
 253                     pnt++;
 254                     fputc( ch, stderr );
 255                 }
 256                 fprintf(stderr,"\n");
 257                 return;
 258           }
 259         case 'i':
 260                 while (count--)
 261                 {
 262                     DEBUG_PrintAddress( &value.addr, DEBUG_CurrThread->dbg_mode, TRUE );
 263                     fprintf(stderr,": ");
 264                     DEBUG_Disasm( &value.addr, TRUE );
 265                     fprintf(stderr,"\n");
 266                 }
 267                 return;
 268 #define DO_DUMP2(_t,_l,_f,_vv) { \
 269                 _t _v; \
 270                 for(i=0; i<count; i++) { \
 271                     if (!DEBUG_READ_MEM_VERBOSE(pnt, &_v, sizeof(_t))) break; \
 272                     fprintf(stderr,_f,(_vv)); \
 273                     pnt += sizeof(_t); value.addr.off += sizeof(_t); \
 274                     if ((i % (_l)) == (_l)-1) { \
 275                         fprintf(stderr,"\n"); \
 276                         DEBUG_PrintAddress( &value.addr, DEBUG_CurrThread->dbg_mode, FALSE );\
 277                         fprintf(stderr,": ");\
 278                     } \
 279                 } \
 280                 fprintf(stderr,"\n"); \
 281         } \
 282         return
 283 #define DO_DUMP(_t,_l,_f) DO_DUMP2(_t,_l,_f,_v)
 284
 285         case 'x': DO_DUMP(int, 4, " %8.8x");
 286         case 'd': DO_DUMP(unsigned int, 4, " %10d");
 287         case 'w': DO_DUMP(unsigned short, 8, " %04x");
 288         case 'c': DO_DUMP2(char, 32, " %c", (_v < 0x20) ? ' ' : _v);
 289         case 'b': DO_DUMP2(char, 16, " %02x", (_v) & 0xff);
 290         }
 291 }