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 <stdlib.h>
  11 #include <string.h>
  12
  13 #include "debugger.h"
  14 #include "miscemu.h"
  15 #include "winbase.h"
  16
  17 #ifdef __i386__
  18 #include "wine/winbase16.h"
  19
  20 #define DBG_V86_MODULE(seg) ((seg)>>16)
  21 #define IS_SELECTOR_V86(seg) DBG_V86_MODULE(seg)
  22 #endif
  23
  24 static  void    DEBUG_Die(const char* msg)
  25 {
  26    DEBUG_Printf(DBG_CHN_MESG, 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 #ifdef __i386__
  56 void DEBUG_FixAddress( DBG_ADDR *addr, DWORD def)
  57 {
  58    if (addr->seg == 0xffffffff) addr->seg = def;
  59    if (!IS_SELECTOR_V86(addr->seg) && DEBUG_IsSelectorSystem(addr->seg)) addr->seg = 0;
  60 }
  61
  62 BOOL  DEBUG_FixSegment( DBG_ADDR* addr )
  63 {
  64    /* V86 mode ? */
  65    if (DEBUG_context.EFlags & V86_FLAG) {
  66       addr->seg |= (DWORD)(GetExePtr(GetCurrentTask())) << 16;
  67       return TRUE;
  68    }
  69    return FALSE;
  70 }
  71
  72 int     DEBUG_GetSelectorType( WORD sel )
  73 {
  74     LDT_ENTRY   le;
  75
  76     if (sel == 0)
  77         return 32;
  78     if (IS_SELECTOR_V86(sel))
  79         return 16;
  80     if (GetThreadSelectorEntry( DEBUG_CurrThread->handle, sel, &le))
  81         return le.HighWord.Bits.Default_Big ? 32 : 16;
  82          /* selector doesn't exist */
  83     return 0;
  84 }
  85
  86 /* Determine if sel is a system selector (i.e. not managed by Wine) */
  87 BOOL    DEBUG_IsSelectorSystem(WORD sel)
  88 {
  89    return !(sel & 4) || (((sel & 0xFFFF) >> 3) < 17);
  90 }
  91 #endif /* __i386__ */
  92
  93 DWORD DEBUG_ToLinear( const DBG_ADDR *addr )
  94 {
  95 #ifdef __i386__
  96    LDT_ENTRY    le;
  97
  98    if (IS_SELECTOR_V86(addr->seg))
  99       return (DWORD) DOSMEM_MemoryBase(DBG_V86_MODULE(addr->seg)) + (((addr->seg)&0xFFFF)<<4) + addr->off;
 100    if (DEBUG_IsSelectorSystem(addr->seg))
 101       return addr->off;
 102
 103    if (GetThreadSelectorEntry( DEBUG_CurrThread->handle, addr->seg, &le)) {
 104       return (le.HighWord.Bits.BaseHi << 24) + (le.HighWord.Bits.BaseMid << 16) + le.BaseLow + addr->off;
 105    }
 106    return 0;
 107 #else
 108    return addr->off;
 109 #endif
 110 }
 111
 112 void DEBUG_GetCurrentAddress( DBG_ADDR *addr )
 113 {
 114 #ifdef __i386__
 115     addr->seg  = DEBUG_context.SegCs;
 116
 117     if (!DEBUG_FixSegment( addr ) && DEBUG_IsSelectorSystem(addr->seg))
 118        addr->seg = 0;
 119     addr->off  = DEBUG_context.Eip;
 120 #else
 121     addr->seg  = 0;
 122     addr->off  = GET_IP( &DEBUG_context );
 123 #endif
 124 }
 125
 126 void    DEBUG_InvalAddr( const DBG_ADDR* addr )
 127 {
 128    DEBUG_Printf(DBG_CHN_MESG,"*** Invalid address ");
 129    DEBUG_PrintAddress(addr, DEBUG_CurrThread->dbg_mode, FALSE);
 130    DEBUG_Printf(DBG_CHN_MESG,"\n");
 131    if (DBG_IVAR(ExtDbgOnInvalidAddress)) DEBUG_ExternalDebugger();
 132 }
 133
 134 void    DEBUG_InvalLinAddr( void* addr )
 135 {
 136    DBG_ADDR address;
 137
 138    address.seg = 0;
 139    address.off = (unsigned long)addr;
 140    DEBUG_InvalAddr( &address );
 141 }
 142
 143 /***********************************************************************
 144  *           DEBUG_ReadMemory
 145  *
 146  * Read a memory value.
 147  */
 148 /* FIXME: this function is now getting closer and closer to
 149  * DEBUG_ExprGetValue. They should be merged...
 150  */
 151 int DEBUG_ReadMemory( const DBG_VALUE* val )
 152 {
 153     int         value = 0; /* to clear any unused byte */
 154     int         os = DEBUG_GetObjectSize(val->type);
 155
 156     assert(sizeof(value) >= os);
 157
 158     /* FIXME: only works on little endian systems */
 159
 160     if (val->cookie == DV_TARGET) {
 161        DBG_ADDR addr = val->addr;
 162        void*    lin;
 163
 164 #ifdef __i386__
 165        DEBUG_FixAddress( &addr, DEBUG_context.SegDs );
 166 #endif
 167        lin = (void*)DEBUG_ToLinear( &addr );
 168
 169        DEBUG_READ_MEM_VERBOSE(lin, &value, os);
 170     } else {
 171        if (val->addr.off)
 172           memcpy(&value, (void*)val->addr.off, os);
 173     }
 174     return value;
 175 }
 176
 177
 178 /***********************************************************************
 179  *           DEBUG_WriteMemory
 180  *
 181  * Store a value in memory.
 182  */
 183 void DEBUG_WriteMemory( const DBG_VALUE* val, int value )
 184 {
 185     int         os = DEBUG_GetObjectSize(val->type);
 186
 187     assert(sizeof(value) >= os);
 188
 189     /* FIXME: only works on little endian systems */
 190
 191     if (val->cookie == DV_TARGET) {
 192        DBG_ADDR addr = val->addr;
 193        void*    lin;
 194
 195 #ifdef __i386__
 196        DEBUG_FixAddress( &addr, DEBUG_context.SegDs );
 197 #endif
 198        lin = (void*)DEBUG_ToLinear( &addr );
 199        DEBUG_WRITE_MEM_VERBOSE(lin, &value, os);
 200     } else {
 201        memcpy((void*)val->addr.off, &value, os);
 202     }
 203 }
 204
 205
 206 /***********************************************************************
 207  *           DEBUG_ExamineMemory
 208  *
 209  * Implementation of the 'x' command.
 210  */
 211 void DEBUG_ExamineMemory( const DBG_VALUE *_value, int count, char format )
 212 {
 213     DBG_VALUE             value = *_value;
 214     int                   i;
 215     unsigned char       * pnt;
 216     struct datatype     * testtype;
 217
 218     assert(_value->cookie == DV_TARGET || _value->cookie == DV_HOST);
 219
 220 #ifdef __i386__
 221     DEBUG_FixAddress( &value.addr,
 222                       (format == 'i') ?
 223                       DEBUG_context.SegCs :
 224                       DEBUG_context.SegDs );
 225 #endif
 226
 227     /*
 228      * Dereference pointer to get actual memory address we need to be
 229      * reading.  We will use the same segment as what we have already,
 230      * and hope that this is a sensible thing to do.
 231      */
 232     if( value.type != NULL )
 233       {
 234         if( value.type == DEBUG_TypeIntConst )
 235           {
 236             /*
 237              * We know that we have the actual offset stored somewhere
 238              * else in 32-bit space.  Grab it, and we
 239              * should be all set.
 240              */
 241             unsigned int  seg2 = value.addr.seg;
 242             value.addr.seg = 0;
 243             value.addr.off = DEBUG_GetExprValue(&value, NULL);
 244             value.addr.seg = seg2;
 245           }
 246         else
 247           {
 248             if (DEBUG_TypeDerefPointer(&value, &testtype) == 0)
 249               return;
 250             if( testtype != NULL || value.type == DEBUG_TypeIntConst )
 251               {
 252                 value.addr.off = DEBUG_GetExprValue(&value, NULL);
 253               }
 254           }
 255       }
 256     else if (!value.addr.seg && !value.addr.off)
 257     {
 258         DEBUG_Printf(DBG_CHN_MESG,"Invalid expression\n");
 259         return;
 260     }
 261
 262     if (format != 'i' && count > 1)
 263     {
 264         DEBUG_PrintAddress( &value.addr, DEBUG_CurrThread->dbg_mode, FALSE );
 265         DEBUG_Printf(DBG_CHN_MESG,": ");
 266     }
 267
 268     pnt = (void*)DEBUG_ToLinear( &value.addr );
 269
 270     switch(format)
 271     {
 272         case 'u': {
 273                 WCHAR wch;
 274                 if (count == 1) count = 256;
 275                 while (count--)
 276                 {
 277                     if (!DEBUG_READ_MEM_VERBOSE(pnt, &wch, sizeof(wch)) || !wch)
 278                        break;
 279                     pnt += sizeof(wch);
 280                     DEBUG_Printf(DBG_CHN_MESG, "%c", (char)wch);
 281                 }
 282                 DEBUG_Printf(DBG_CHN_MESG,"\n");
 283                 return;
 284             }
 285           case 's': {
 286                 char ch;
 287
 288                 if (count == 1) count = 256;
 289                 while (count--)
 290                 {
 291                     if (!DEBUG_READ_MEM_VERBOSE(pnt, &ch, sizeof(ch)) || !ch)
 292                        break;
 293                     pnt++;
 294                     DEBUG_Output(DBG_CHN_MESG, &ch, 1);
 295                 }
 296                 DEBUG_Printf(DBG_CHN_MESG,"\n");
 297                 return;
 298           }
 299         case 'i':
 300                 while (count--)
 301                 {
 302                     DEBUG_PrintAddress( &value.addr, DEBUG_CurrThread->dbg_mode, TRUE );
 303                     DEBUG_Printf(DBG_CHN_MESG,": ");
 304                     DEBUG_Disasm( &value.addr, TRUE );
 305                     DEBUG_Printf(DBG_CHN_MESG,"\n");
 306                 }
 307                 return;
 308 #define DO_DUMP2(_t,_l,_f,_vv) { \
 309                 _t _v; \
 310                 for(i=0; i<count; i++) { \
 311                     if (!DEBUG_READ_MEM_VERBOSE(pnt, &_v, sizeof(_t))) break; \
 312                     DEBUG_Printf(DBG_CHN_MESG,_f,(_vv)); \
 313                     pnt += sizeof(_t); value.addr.off += sizeof(_t); \
 314                     if ((i % (_l)) == (_l)-1) { \
 315                         DEBUG_Printf(DBG_CHN_MESG,"\n"); \
 316                         DEBUG_PrintAddress( &value.addr, DEBUG_CurrThread->dbg_mode, FALSE );\
 317                         DEBUG_Printf(DBG_CHN_MESG,": ");\
 318                     } \
 319                 } \
 320                 DEBUG_Printf(DBG_CHN_MESG,"\n"); \
 321         } \
 322         return
 323 #define DO_DUMP(_t,_l,_f) DO_DUMP2(_t,_l,_f,_v)
 324
 325         case 'x': DO_DUMP(int, 4, " %8.8x");
 326         case 'd': DO_DUMP(unsigned int, 4, " %10d");
 327         case 'w': DO_DUMP(unsigned short, 8, " %04x");
 328         case 'c': DO_DUMP2(char, 32, " %c", (_v < 0x20) ? ' ' : _v);
 329         case 'b': DO_DUMP2(char, 16, " %02x", (_v) & 0xff);
 330         }
 331 }