/*
* Debugger memory handling
*
* Copyright 1993 Eric Youngdale
* Copyright 1995 Alexandre Julliard
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include "wine/winbase16.h"
#include "debugger.h"
#include "miscemu.h"
/************************************************************
*
* Check if linear pointer in [addr, addr+size[
* read (rwflag == 1)
* or
* write (rwflag == 0)
************************************************************/
BOOL DEBUG_checkmap_bad( const char *addr, size_t size, int rwflag)
{
FILE *fp;
char buf[200]; /* temporary line buffer */
char prot[5]; /* protection string */
char *start, *end;
int ret = TRUE;
#ifdef linux
/*
The entries in /proc/self/maps are of the form:
08000000-08002000 r-xp 00000000 03:41 2361
08002000-08003000 rw-p 00001000 03:41 2361
08003000-08005000 rwxp 00000000 00:00 0
40000000-40005000 r-xp 00000000 03:41 67219
40005000-40006000 rw-p 00004000 03:41 67219
40006000-40007000 rw-p 00000000 00:00 0
...
start end perm ??? major:minor inode
Only permissions start and end are used here
*/
#else
/*
% cat /proc/curproc/map
start end resident private perm type
0x1000 0xe000 12 0 r-x COW vnode
0xe000 0x10000 2 2 rwx COW vnode
0x10000 0x27000 4 4 rwx default
0x800e000 0x800f000 1 1 rw- default
0xefbde000 0xefbfe000 1 1 rwx default
COW = "copy on write"
% cat /proc/curproc/map on FreeBSD 3.0
start end ? ? ? prot ? ? ? ? ? ?
0x8048000 0x8054000 12 14 114770 r-x 2 1 0x0 COW NC vnode
0x8054000 0x8055000 1 0 166664 rwx 1 0 0x2180 COW NNC vnode
0x8055000 0x806a000 5 0 166662 rwx 1 0 0x2180 NCOW NNC default
0x28054000 0x28055000 1 0 166666 rwx 1 0 0x2180 NCOW NNC default
0xefbde000 0xefbfe000 1 0 166663 rwx 1 0 0x2180 NCOW NNC default
*/
#endif
if (!(fp = fopen("/proc/self/maps","r")) &&
!(fp = fopen("/proc/curproc/map","r"))
)
return FALSE;
#ifdef __FreeBSD__
/*
* *FOO* read(2) less than length of /proc/.../map fails with EFBIG
*
* $ dd bs=256 </proc/curproc/map
* dd: stdin: File too large
* 0+0 records in
* 0+0 records out
* 0 bytes transferred in 0.001595 secs (0 bytes/sec)
*/
setvbuf(fp, (char *)NULL, _IOFBF, 0x4000);
#endif
while (fgets( buf, sizeof(buf)-1, fp)) {
#ifdef linux
sscanf(buf, "%x-%x %3s", (int *) &start, (int *) &end, prot);
#else
sscanf(buf, "%x %x %*d %*d %3s", (int *) &start, (int *) &end, prot);
if (prot[0]!='r' && prot[0]!='-') /* FreeBSD 3.0 format */
sscanf(buf, "%x %x %*d %*d %*d %3s", (int *) &start, (int *) &end, prot);
#endif
if ( end <= addr)
continue;
if (start <= addr && addr+size <= end) {
if (rwflag)
ret = (prot[0] != 'r'); /* test for reading */
else
ret = (prot[1] != 'w'); /* test for writing */
}
break;
}
fclose( fp);
return ret;
}
/***********************************************************************
* DEBUG_IsBadReadPtr
*
* Check if we are allowed to read memory at 'address'.
*/
BOOL DEBUG_IsBadReadPtr( const DBG_ADDR *address, int size )
{
if (!IS_SELECTOR_V86(address->seg))
if (address->seg) /* segmented addr */
{
if (IsBadReadPtr16( (SEGPTR)MAKELONG( (WORD)address->off,
(WORD)address->seg ), size ))
return TRUE;
}
return DEBUG_checkmap_bad( DBG_ADDR_TO_LIN(address), size, 1);
}
/***********************************************************************
* DEBUG_IsBadWritePtr
*
* Check if we are allowed to write memory at 'address'.
*/
BOOL DEBUG_IsBadWritePtr( const DBG_ADDR *address, int size )
{
if (!IS_SELECTOR_V86(address->seg))
if (address->seg) /* segmented addr */
{
/* Note: we use IsBadReadPtr here because we are */
/* always allowed to write to read-only segments */
if (IsBadReadPtr16( (SEGPTR)MAKELONG( (WORD)address->off,
(WORD)address->seg ), size ))
return TRUE;
}
return DEBUG_checkmap_bad( DBG_ADDR_TO_LIN(address), size, 0);
}
/***********************************************************************
* DEBUG_ReadMemory
*
* Read a memory value.
*/
int DEBUG_ReadMemory( const DBG_ADDR *address )
{
DBG_ADDR addr = *address;
DBG_FIX_ADDR_SEG( &addr, DS_reg(&DEBUG_context) );
if (!DBG_CHECK_READ_PTR( &addr, sizeof(int) )) return 0;
return *(int *)DBG_ADDR_TO_LIN( &addr );
}
/***********************************************************************
* DEBUG_WriteMemory
*
* Store a value in memory.
*/
void DEBUG_WriteMemory( const DBG_ADDR *address, int value )
{
DBG_ADDR addr = *address;
DBG_FIX_ADDR_SEG( &addr, DS_reg(&DEBUG_context) );
if (!DBG_CHECK_WRITE_PTR( &addr, sizeof(int) )) return;
*(int *)DBG_ADDR_TO_LIN( &addr ) = value;
}
/***********************************************************************
* DEBUG_ExamineMemory
*
* Implementation of the 'x' command.
*/
void DEBUG_ExamineMemory( const DBG_ADDR *address, int count, char format )
{
DBG_ADDR addr = * address;
unsigned int * dump;
int i;
unsigned char * pnt;
unsigned int seg2;
struct datatype * testtype;
unsigned short int * wdump;
DBG_FIX_ADDR_SEG( &addr, (format == 'i') ?
CS_reg(&DEBUG_context) : DS_reg(&DEBUG_context) );
/*
* 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( addr.type != NULL )
{
if( addr.type == DEBUG_TypeIntConst )
{
/*
* We know that we have the actual offset stored somewhere
* else in 32-bit space. Grab it, and we
* should be all set.
*/
seg2 = addr.seg;
addr.seg = 0;
addr.off = DEBUG_GetExprValue(&addr, NULL);
addr.seg = seg2;
}
else
{
if (!DBG_CHECK_READ_PTR( &addr, 1 )) return;
DEBUG_TypeDerefPointer(&addr, &testtype);
if( testtype != NULL || addr.type == DEBUG_TypeIntConst )
{
addr.off = DEBUG_GetExprValue(&addr, NULL);
}
}
}
else if (!addr.seg && !addr.off)
{
fprintf(stderr,"Invalid expression\n");
return;
}
if (format != 'i' && count > 1)
{
DEBUG_PrintAddress( &addr, dbg_mode, FALSE );
fprintf(stderr,": ");
}
pnt = DBG_ADDR_TO_LIN( &addr );
switch(format)
{
case 'u': {
WCHAR *ptr = (WCHAR*)pnt;
if (count == 1) count = 256;
while (count--)
{
if (!DBG_CHECK_READ_PTR( &addr, sizeof(WCHAR) )) return;
if (!*ptr) break;
addr.off++;
fputc( (char)*ptr++, stderr );
}
fprintf(stderr,"\n");
return;
}
case 's':
if (count == 1) count = 256;
while (count--)
{
if (!DBG_CHECK_READ_PTR( &addr, sizeof(char) )) return;
if (!*pnt) break;
addr.off++;
fputc( *pnt++, stderr );
}
fprintf(stderr,"\n");
return;
case 'i':
while (count--)
{
DEBUG_PrintAddress( &addr, dbg_mode, TRUE );
fprintf(stderr,": ");
if (!DBG_CHECK_READ_PTR( &addr, 1 )) return;
DEBUG_Disasm( &addr, TRUE );
fprintf(stderr,"\n");
}
return;
case 'x':
dump = (unsigned int *)pnt;
for(i=0; i<count; i++)
{
if (!DBG_CHECK_READ_PTR( &addr, sizeof(int) )) return;
fprintf(stderr," %8.8x", *dump++);
addr.off += sizeof(int);
if ((i % 4) == 3)
{
fprintf(stderr,"\n");
DEBUG_PrintAddress( &addr, dbg_mode, FALSE );
fprintf(stderr,": ");
}
}
fprintf(stderr,"\n");
return;
case 'd':
dump = (unsigned int *)pnt;
for(i=0; i<count; i++)
{
if (!DBG_CHECK_READ_PTR( &addr, sizeof(int) )) return;
fprintf(stderr," %10d", *dump++);
addr.off += sizeof(int);
if ((i % 4) == 3)
{
fprintf(stderr,"\n");
DEBUG_PrintAddress( &addr, dbg_mode, FALSE );
fprintf(stderr,": ");
}
}
fprintf(stderr,"\n");
return;
case 'w':
wdump = (unsigned short *)pnt;
for(i=0; i<count; i++)
{
if (!DBG_CHECK_READ_PTR( &addr, sizeof(short) )) return;
fprintf(stderr," %04x", *wdump++);
addr.off += sizeof(short);
if ((i % 8) == 7)
{
fprintf(stderr,"\n");
DEBUG_PrintAddress( &addr, dbg_mode, FALSE );
fprintf(stderr,": ");
}
}
fprintf(stderr,"\n");
return;
case 'c':
for(i=0; i<count; i++)
{
if (!DBG_CHECK_READ_PTR( &addr, sizeof(char) )) return;
if(*pnt < 0x20)
{
fprintf(stderr," ");
pnt++;
}
else fprintf(stderr," %c", *pnt++);
addr.off++;
if ((i % 32) == 31)
{
fprintf(stderr,"\n");
DEBUG_PrintAddress( &addr, dbg_mode, FALSE );
fprintf(stderr,": ");
}
}
fprintf(stderr,"\n");
return;
case 'b':
for(i=0; i<count; i++)
{
if (!DBG_CHECK_READ_PTR( &addr, sizeof(char) )) return;
fprintf(stderr," %02x", (*pnt++) & 0xff);
addr.off++;
if ((i % 16) == 15)
{
fprintf(stderr,"\n");
DEBUG_PrintAddress( &addr, dbg_mode, FALSE );
fprintf(stderr,": ");
}
}
fprintf(stderr,"\n");
return;
}
}