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Sweden-Number/debugger/memory.c

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/*
* Debugger memory handling
*
* Copyright 1993 Eric Youngdale
* Copyright 1995 Alexandre Julliard
* Copyright 2000 Eric Pouech
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include "debugger.h"
#include "winbase.h"
#ifdef __i386__
#define IS_VM86_MODE() (DEBUG_context.EFlags & V86_FLAG)
#endif
static void DEBUG_Die(const char* msg)
{
DEBUG_Printf(DBG_CHN_MESG, msg);
exit(1);
}
void* DEBUG_XMalloc(size_t size)
{
void *res = malloc(size ? size : 1);
if (res == NULL)
DEBUG_Die("Memory exhausted.\n");
memset(res, 0, size);
return res;
}
void* DEBUG_XReAlloc(void *ptr, size_t size)
{
void* res = realloc(ptr, size);
if ((res == NULL) && size)
DEBUG_Die("Memory exhausted.\n");
return res;
}
char* DEBUG_XStrDup(const char *str)
{
char *res = strdup(str);
if (!res)
DEBUG_Die("Memory exhausted.\n");
return res;
}
enum dbg_mode DEBUG_GetSelectorType( WORD sel )
{
#ifdef __i386__
LDT_ENTRY le;
if (IS_VM86_MODE()) return MODE_VM86;
if (sel == 0) return MODE_32;
if (GetThreadSelectorEntry( DEBUG_CurrThread->handle, sel, &le))
return le.HighWord.Bits.Default_Big ? MODE_32 : MODE_16;
/* selector doesn't exist */
return MODE_INVALID;
#else
return MODE_32;
#endif
}
#ifdef __i386__
void DEBUG_FixAddress( DBG_ADDR *addr, DWORD def)
{
if (addr->seg == 0xffffffff) addr->seg = def;
if (DEBUG_IsSelectorSystem(addr->seg)) addr->seg = 0;
}
/* Determine if sel is a system selector (i.e. not managed by Wine) */
BOOL DEBUG_IsSelectorSystem(WORD sel)
{
if (IS_VM86_MODE()) return FALSE; /* no system selectors in vm86 mode */
return !(sel & 4) || ((sel >> 3) < 17);
}
#endif /* __i386__ */
DWORD DEBUG_ToLinear( const DBG_ADDR *addr )
{
#ifdef __i386__
LDT_ENTRY le;
if (IS_VM86_MODE()) return (DWORD)(LOWORD(addr->seg) << 4) + addr->off;
if (DEBUG_IsSelectorSystem(addr->seg))
return addr->off;
if (GetThreadSelectorEntry( DEBUG_CurrThread->handle, addr->seg, &le)) {
return (le.HighWord.Bits.BaseHi << 24) + (le.HighWord.Bits.BaseMid << 16) + le.BaseLow + addr->off;
}
return 0;
#else
return addr->off;
#endif
}
void DEBUG_GetCurrentAddress( DBG_ADDR *addr )
{
#ifdef __i386__
addr->seg = DEBUG_context.SegCs;
if (DEBUG_IsSelectorSystem(addr->seg))
addr->seg = 0;
addr->off = DEBUG_context.Eip;
#elif defined(__sparc__)
addr->seg = 0;
addr->off = DEBUG_context.pc;
#else
# error You must define GET_IP for this CPU
#endif
}
void DEBUG_InvalAddr( const DBG_ADDR* addr )
{
DEBUG_Printf(DBG_CHN_MESG,"*** Invalid address ");
DEBUG_PrintAddress(addr, DEBUG_CurrThread->dbg_mode, FALSE);
DEBUG_Printf(DBG_CHN_MESG,"\n");
if (DBG_IVAR(ExtDbgOnInvalidAddress)) DEBUG_ExternalDebugger();
}
void DEBUG_InvalLinAddr( void* addr )
{
DBG_ADDR address;
address.seg = 0;
address.off = (unsigned long)addr;
DEBUG_InvalAddr( &address );
}
/***********************************************************************
* DEBUG_ReadMemory
*
* Read a memory value.
*/
/* FIXME: this function is now getting closer and closer to
* DEBUG_ExprGetValue. They should be merged...
*/
int DEBUG_ReadMemory( const DBG_VALUE* val )
{
int value = 0; /* to clear any unused byte */
int os = DEBUG_GetObjectSize(val->type);
assert(sizeof(value) >= os);
/* FIXME: only works on little endian systems */
if (val->cookie == DV_TARGET) {
DBG_ADDR addr = val->addr;
void* lin;
#ifdef __i386__
DEBUG_FixAddress( &addr, DEBUG_context.SegDs );
#endif
lin = (void*)DEBUG_ToLinear( &addr );
DEBUG_READ_MEM_VERBOSE(lin, &value, os);
} else {
if (val->addr.off)
memcpy(&value, (void*)val->addr.off, os);
}
return value;
}
/***********************************************************************
* DEBUG_WriteMemory
*
* Store a value in memory.
*/
void DEBUG_WriteMemory( const DBG_VALUE* val, int value )
{
int os = DEBUG_GetObjectSize(val->type);
assert(sizeof(value) >= os);
/* FIXME: only works on little endian systems */
if (val->cookie == DV_TARGET) {
DBG_ADDR addr = val->addr;
void* lin;
#ifdef __i386__
DEBUG_FixAddress( &addr, DEBUG_context.SegDs );
#endif
lin = (void*)DEBUG_ToLinear( &addr );
DEBUG_WRITE_MEM_VERBOSE(lin, &value, os);
} else {
memcpy((void*)val->addr.off, &value, os);
}
}
/***********************************************************************
* DEBUG_GrabAddress
*
* Get the address from a value
*/
BOOL DEBUG_GrabAddress( DBG_VALUE* value, BOOL fromCode )
{
assert(value->cookie == DV_TARGET || value->cookie == DV_HOST);
#ifdef __i386__
DEBUG_FixAddress( &value->addr,
(fromCode) ? DEBUG_context.SegCs : DEBUG_context.SegDs);
#endif
/*
* Dereference pointer to get actual memory address we need to be
* reading. We will use the same segment as what we have already,
* and hope that this is a sensible thing to do.
*/
if (value->type != NULL) {
if (value->type == DEBUG_GetBasicType(DT_BASIC_CONST_INT)) {
/*
* We know that we have the actual offset stored somewhere
* else in 32-bit space. Grab it, and we
* should be all set.
*/
unsigned int seg2 = value->addr.seg;
value->addr.seg = 0;
value->addr.off = DEBUG_GetExprValue(value, NULL);
value->addr.seg = seg2;
} else {
struct datatype * testtype;
if (DEBUG_TypeDerefPointer(value, &testtype) == 0)
return FALSE;
if (testtype != NULL || value->type == DEBUG_GetBasicType(DT_BASIC_CONST_INT))
value->addr.off = DEBUG_GetExprValue(value, NULL);
}
} else if (!value->addr.seg && !value->addr.off) {
DEBUG_Printf(DBG_CHN_MESG,"Invalid expression\n");
return FALSE;
}
return TRUE;
}
/***********************************************************************
* DEBUG_ExamineMemory
*
* Implementation of the 'x' command.
*/
void DEBUG_ExamineMemory( const DBG_VALUE *_value, int count, char format )
{
DBG_VALUE value = *_value;
int i;
unsigned char * pnt;
if (!DEBUG_GrabAddress(&value, (format == 'i'))) return;
if (format != 'i' && count > 1)
{
DEBUG_PrintAddress( &value.addr, DEBUG_CurrThread->dbg_mode, FALSE );
DEBUG_Printf(DBG_CHN_MESG,": ");
}
pnt = (void*)DEBUG_ToLinear( &value.addr );
switch(format)
{
case 'u': {
WCHAR wch;
if (count == 1) count = 256;
while (count--)
{
if (!DEBUG_READ_MEM_VERBOSE(pnt, &wch, sizeof(wch)) || !wch)
break;
pnt += sizeof(wch);
DEBUG_Printf(DBG_CHN_MESG, "%c", (char)wch);
}
DEBUG_Printf(DBG_CHN_MESG,"\n");
return;
}
case 's': {
char ch;
if (count == 1) count = 256;
while (count--)
{
if (!DEBUG_READ_MEM_VERBOSE(pnt, &ch, sizeof(ch)) || !ch)
break;
pnt++;
DEBUG_Output(DBG_CHN_MESG, &ch, 1);
}
DEBUG_Printf(DBG_CHN_MESG,"\n");
return;
}
case 'i':
while (count-- && DEBUG_DisassembleInstruction( &value.addr ));
return;
#define DO_DUMP2(_t,_l,_f,_vv) { \
_t _v; \
for(i=0; i<count; i++) { \
if (!DEBUG_READ_MEM_VERBOSE(pnt, &_v, sizeof(_t))) break; \
DEBUG_Printf(DBG_CHN_MESG,_f,(_vv)); \
pnt += sizeof(_t); value.addr.off += sizeof(_t); \
if ((i % (_l)) == (_l)-1) { \
DEBUG_Printf(DBG_CHN_MESG,"\n"); \
DEBUG_PrintAddress( &value.addr, DEBUG_CurrThread->dbg_mode, FALSE );\
DEBUG_Printf(DBG_CHN_MESG,": ");\
} \
} \
DEBUG_Printf(DBG_CHN_MESG,"\n"); \
} \
return
#define DO_DUMP(_t,_l,_f) DO_DUMP2(_t,_l,_f,_v)
case 'x': DO_DUMP(int, 4, " %8.8x");
case 'd': DO_DUMP(unsigned int, 4, " %10d");
case 'w': DO_DUMP(unsigned short, 8, " %04x");
case 'c': DO_DUMP2(char, 32, " %c", (_v < 0x20) ? ' ' : _v);
case 'b': DO_DUMP2(char, 16, " %02x", (_v) & 0xff);
}
}
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