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  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #include "config.h"
  24 #include "wine/port.h"
  25
  26 #include <stdlib.h>
  27 #include <string.h>
  28
  29 #include "debugger.h"
  30 #include "winbase.h"
  31
  32 #ifdef __i386__
  33 #define IS_VM86_MODE() (DEBUG_context.EFlags & V86_FLAG)
  34 #endif
  35
  36 static  void    DEBUG_Die(const char* msg)
  37 {
  38    DEBUG_Printf(DBG_CHN_MESG, msg);
  39    exit(1);
  40 }
  41
  42 void*   DEBUG_XMalloc(size_t size)
  43 {
  44    void *res = malloc(size ? size : 1);
  45    if (res == NULL)
  46       DEBUG_Die("Memory exhausted.\n");
  47    memset(res, 0, size);
  48    return res;
  49 }
  50
  51 void* DEBUG_XReAlloc(void *ptr, size_t size)
  52 {
  53    void* res = realloc(ptr, size);
  54    if ((res == NULL) && size)
  55       DEBUG_Die("Memory exhausted.\n");
  56    return res;
  57 }
  58
  59 char*   DEBUG_XStrDup(const char *str)
  60 {
  61    char *res = strdup(str);
  62    if (!res)
  63       DEBUG_Die("Memory exhausted.\n");
  64    return res;
  65 }
  66
  67 enum dbg_mode DEBUG_GetSelectorType( WORD sel )
  68 {
  69 #ifdef __i386__
  70     LDT_ENTRY   le;
  71
  72     if (IS_VM86_MODE()) return MODE_VM86;
  73     if (sel == 0) return MODE_32;
  74     if (GetThreadSelectorEntry( DEBUG_CurrThread->handle, sel, &le))
  75         return le.HighWord.Bits.Default_Big ? MODE_32 : MODE_16;
  76     /* selector doesn't exist */
  77     return MODE_INVALID;
  78 #else
  79     return MODE_32;
  80 #endif
  81 }
  82 #ifdef __i386__
  83 void DEBUG_FixAddress( DBG_ADDR *addr, DWORD def)
  84 {
  85    if (addr->seg == 0xffffffff) addr->seg = def;
  86    if (DEBUG_IsSelectorSystem(addr->seg)) addr->seg = 0;
  87 }
  88
  89 /* Determine if sel is a system selector (i.e. not managed by Wine) */
  90 BOOL    DEBUG_IsSelectorSystem(WORD sel)
  91 {
  92     if (IS_VM86_MODE()) return FALSE;  /* no system selectors in vm86 mode */
  93     return !(sel & 4) || ((sel >> 3) < 17);
  94 }
  95 #endif /* __i386__ */
  96
  97 DWORD DEBUG_ToLinear( const DBG_ADDR *addr )
  98 {
  99 #ifdef __i386__
 100    LDT_ENTRY    le;
 101
 102    if (IS_VM86_MODE()) return (DWORD)(LOWORD(addr->seg) << 4) + addr->off;
 103
 104    if (DEBUG_IsSelectorSystem(addr->seg))
 105       return addr->off;
 106
 107    if (GetThreadSelectorEntry( DEBUG_CurrThread->handle, addr->seg, &le)) {
 108       return (le.HighWord.Bits.BaseHi << 24) + (le.HighWord.Bits.BaseMid << 16) + le.BaseLow + addr->off;
 109    }
 110    return 0;
 111 #else
 112    return addr->off;
 113 #endif
 114 }
 115
 116 void DEBUG_GetCurrentAddress( DBG_ADDR *addr )
 117 {
 118 #ifdef __i386__
 119     addr->seg  = DEBUG_context.SegCs;
 120
 121     if (DEBUG_IsSelectorSystem(addr->seg))
 122        addr->seg = 0;
 123     addr->off  = DEBUG_context.Eip;
 124 #elif defined(__sparc__)
 125          addr->seg = 0;
 126     addr->off = DEBUG_context.pc;
 127 #else
 128 #       error You must define GET_IP for this CPU
 129 #endif
 130 }
 131
 132 void    DEBUG_InvalAddr( const DBG_ADDR* addr )
 133 {
 134    DEBUG_Printf(DBG_CHN_MESG,"*** Invalid address ");
 135    DEBUG_PrintAddress(addr, DEBUG_CurrThread->dbg_mode, FALSE);
 136    DEBUG_Printf(DBG_CHN_MESG,"\n");
 137    if (DBG_IVAR(ExtDbgOnInvalidAddress)) DEBUG_ExternalDebugger();
 138 }
 139
 140 void    DEBUG_InvalLinAddr( void* addr )
 141 {
 142    DBG_ADDR address;
 143
 144    address.seg = 0;
 145    address.off = (unsigned long)addr;
 146    DEBUG_InvalAddr( &address );
 147 }
 148
 149 /***********************************************************************
 150  *           DEBUG_ReadMemory
 151  *
 152  * Read a memory value.
 153  */
 154 /* FIXME: this function is now getting closer and closer to
 155  * DEBUG_ExprGetValue. They should be merged...
 156  */
 157 int DEBUG_ReadMemory( const DBG_VALUE* val )
 158 {
 159     int         value = 0; /* to clear any unused byte */
 160     int         os = DEBUG_GetObjectSize(val->type);
 161
 162     assert(sizeof(value) >= os);
 163
 164     /* FIXME: only works on little endian systems */
 165
 166     if (val->cookie == DV_TARGET) {
 167        DBG_ADDR addr = val->addr;
 168        void*    lin;
 169
 170 #ifdef __i386__
 171        DEBUG_FixAddress( &addr, DEBUG_context.SegDs );
 172 #endif
 173        lin = (void*)DEBUG_ToLinear( &addr );
 174
 175        DEBUG_READ_MEM_VERBOSE(lin, &value, os);
 176     } else {
 177        if (val->addr.off)
 178           memcpy(&value, (void*)val->addr.off, os);
 179     }
 180     return value;
 181 }
 182
 183
 184 /***********************************************************************
 185  *           DEBUG_WriteMemory
 186  *
 187  * Store a value in memory.
 188  */
 189 void DEBUG_WriteMemory( const DBG_VALUE* val, int value )
 190 {
 191     int         os = DEBUG_GetObjectSize(val->type);
 192
 193     assert(sizeof(value) >= os);
 194
 195     /* FIXME: only works on little endian systems */
 196
 197     if (val->cookie == DV_TARGET) {
 198        DBG_ADDR addr = val->addr;
 199        void*    lin;
 200
 201 #ifdef __i386__
 202        DEBUG_FixAddress( &addr, DEBUG_context.SegDs );
 203 #endif
 204        lin = (void*)DEBUG_ToLinear( &addr );
 205        DEBUG_WRITE_MEM_VERBOSE(lin, &value, os);
 206     } else {
 207        memcpy((void*)val->addr.off, &value, os);
 208     }
 209 }
 210
 211 /***********************************************************************
 212  *           DEBUG_GrabAddress
 213  *
 214  * Get the address from a value
 215  */
 216 BOOL DEBUG_GrabAddress( DBG_VALUE* value, BOOL fromCode )
 217 {
 218     assert(value->cookie == DV_TARGET || value->cookie == DV_HOST);
 219
 220 #ifdef __i386__
 221     DEBUG_FixAddress( &value->addr,
 222                       (fromCode) ? DEBUG_context.SegCs : DEBUG_context.SegDs);
 223 #endif
 224
 225     /*
 226      * Dereference pointer to get actual memory address we need to be
 227      * reading.  We will use the same segment as what we have already,
 228      * and hope that this is a sensible thing to do.
 229      */
 230     if (value->type != NULL) {
 231         if (value->type == DEBUG_GetBasicType(DT_BASIC_CONST_INT)) {
 232             /*
 233              * We know that we have the actual offset stored somewhere
 234              * else in 32-bit space.  Grab it, and we
 235              * should be all set.
 236              */
 237             unsigned int  seg2 = value->addr.seg;
 238             value->addr.seg = 0;
 239             value->addr.off = DEBUG_GetExprValue(value, NULL);
 240             value->addr.seg = seg2;
 241         } else {
 242             struct datatype     * testtype;
 243
 244             if (DEBUG_TypeDerefPointer(value, &testtype) == 0)
 245                 return FALSE;
 246             if (testtype != NULL || value->type == DEBUG_GetBasicType(DT_BASIC_CONST_INT))
 247                 value->addr.off = DEBUG_GetExprValue(value, NULL);
 248         }
 249     } else if (!value->addr.seg && !value->addr.off) {
 250         DEBUG_Printf(DBG_CHN_MESG,"Invalid expression\n");
 251         return FALSE;
 252     }
 253     return TRUE;
 254 }
 255
 256 /***********************************************************************
 257  *           DEBUG_ExamineMemory
 258  *
 259  * Implementation of the 'x' command.
 260  */
 261 void DEBUG_ExamineMemory( const DBG_VALUE *_value, int count, char format )
 262 {
 263     DBG_VALUE             value = *_value;
 264     int                   i;
 265     unsigned char       * pnt;
 266
 267     if (!DEBUG_GrabAddress(&value, (format == 'i'))) return;
 268
 269     if (format != 'i' && count > 1)
 270     {
 271         DEBUG_PrintAddress( &value.addr, DEBUG_CurrThread->dbg_mode, FALSE );
 272         DEBUG_Printf(DBG_CHN_MESG,": ");
 273     }
 274
 275     pnt = (void*)DEBUG_ToLinear( &value.addr );
 276
 277     switch(format)
 278     {
 279          case 'u':
 280                 if (count == 1) count = 256;
 281                 DEBUG_nchar += DEBUG_PrintStringW(DBG_CHN_MESG, &value.addr, count);
 282                 DEBUG_Printf(DBG_CHN_MESG, "\n");
 283                 return;
 284         case 's':
 285                 DEBUG_nchar += DEBUG_PrintStringA(DBG_CHN_MESG, &value.addr, count);
 286                 DEBUG_Printf(DBG_CHN_MESG, "\n");
 287                 return;
 288         case 'i':
 289                 while (count-- && DEBUG_DisassembleInstruction( &value.addr ));
 290                 return;
 291 #define DO_DUMP2(_t,_l,_f,_vv) { \
 292                 _t _v; \
 293                 for(i=0; i<count; i++) { \
 294                     if (!DEBUG_READ_MEM_VERBOSE(pnt, &_v, sizeof(_t))) break; \
 295                     DEBUG_Printf(DBG_CHN_MESG,_f,(_vv)); \
 296                     pnt += sizeof(_t); value.addr.off += sizeof(_t); \
 297                     if ((i % (_l)) == (_l)-1) { \
 298                         DEBUG_Printf(DBG_CHN_MESG,"\n"); \
 299                         DEBUG_PrintAddress( &value.addr, DEBUG_CurrThread->dbg_mode, FALSE );\
 300                         DEBUG_Printf(DBG_CHN_MESG,": ");\
 301                     } \
 302                 } \
 303                 DEBUG_Printf(DBG_CHN_MESG,"\n"); \
 304         } \
 305         return
 306 #define DO_DUMP(_t,_l,_f) DO_DUMP2(_t,_l,_f,_v)
 307
 308         case 'x': DO_DUMP(int, 4, " %8.8x");
 309         case 'd': DO_DUMP(unsigned int, 4, " %10d");
 310         case 'w': DO_DUMP(unsigned short, 8, " %04x");
 311         case 'c': DO_DUMP2(char, 32, " %c", (_v < 0x20) ? ' ' : _v);
 312         case 'b': DO_DUMP2(char, 16, " %02x", (_v) & 0xff);
 313         }
 314 }
 315
 316 /******************************************************************
 317  *              DEBUG_PrintStringA
 318  *
 319  * Prints on channel chnl, the string starting at address in target
 320  * address space. The string stops when either len chars (if <> -1)
 321  * have been printed, or the '\0' char is printed
 322  */
 323 int  DEBUG_PrintStringA(int chnl, const DBG_ADDR* address, int len)
 324 {
 325     char*       lin = (void*)DEBUG_ToLinear(address);
 326     char        ach[16+1];
 327     int         i, l;
 328
 329     if (len == -1) len = 32767; /* should be big enough */
 330
 331     /* so that the ach is always terminated */
 332     ach[sizeof(ach) - 1] = '\0';
 333     for (i = len; i >= 0; i -= sizeof(ach) - 1)
 334     {
 335         l = min(sizeof(ach) - 1, i);
 336         DEBUG_READ_MEM_VERBOSE(lin, ach, l);
 337         l = strlen(ach);
 338         DEBUG_OutputA(chnl, ach, l);
 339         lin += l;
 340         if (l < sizeof(ach) - 1) break;
 341     }
 342     return len - i; /* number of actually written chars */
 343 }
 344
 345 int  DEBUG_PrintStringW(int chnl, const DBG_ADDR* address, int len)
 346 {
 347     char*       lin = (void*)DEBUG_ToLinear(address);
 348     WCHAR       wch;
 349     int         ret = 0;
 350
 351     if (len == -1) len = 32767; /* should be big enough */
 352     while (len--)
 353     {
 354         if (!DEBUG_READ_MEM_VERBOSE(lin, &wch, sizeof(wch)) || !wch)
 355             break;
 356         lin += sizeof(wch);
 357         DEBUG_OutputW(chnl, &wch, 1);
 358         ret++;
 359     }
 360     return ret;
 361 }