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351 lines
9.7 KiB
C
351 lines
9.7 KiB
C
/*
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* Debugger memory handling
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*
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* Copyright 1993 Eric Youngdale
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* Copyright 1995 Alexandre Julliard
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*/
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include "wine/winbase16.h"
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#include "debugger.h"
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#include "miscemu.h"
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/************************************************************
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*
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* Check if linear pointer in [addr, addr+size[
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* read (rwflag == 1)
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* or
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* write (rwflag == 0)
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************************************************************/
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#if defined(linux) || defined(__FreeBSD__) || defined(__OpenBSD__)
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BOOL DEBUG_checkmap_bad( const char *addr, size_t size, int rwflag)
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{
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FILE *fp;
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char buf[80]; /* temporary line buffer */
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char prot[5]; /* protection string */
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char *start, *end;
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int ret = TRUE;
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#ifdef linux
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/*
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The entries in /proc/self/maps are of the form:
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08000000-08002000 r-xp 00000000 03:41 2361
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08002000-08003000 rw-p 00001000 03:41 2361
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08003000-08005000 rwxp 00000000 00:00 0
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40000000-40005000 r-xp 00000000 03:41 67219
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40005000-40006000 rw-p 00004000 03:41 67219
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40006000-40007000 rw-p 00000000 00:00 0
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...
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start end perm ??? major:minor inode
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Only permissions start and end are used here
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*/
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#else
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/*
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% cat /proc/curproc/map
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start end resident private perm type
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0x1000 0xe000 12 0 r-x COW vnode
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0xe000 0x10000 2 2 rwx COW vnode
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0x10000 0x27000 4 4 rwx default
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0x800e000 0x800f000 1 1 rw- default
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0xefbde000 0xefbfe000 1 1 rwx default
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COW = "copy on write"
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*/
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#endif
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#ifdef linux
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if (!(fp = fopen("/proc/self/maps", "r")))
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#else
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if (!(fp = fopen("/proc/curproc/map", "r")))
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#endif
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return FALSE;
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while (fgets( buf, 79, fp)) {
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#ifdef linux
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sscanf(buf, "%x-%x %3s", (int *) &start, (int *) &end, prot);
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#else
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sscanf(buf, "%x %x %*d %*d %3s", (int *) &start, (int *) &end, prot);
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#endif
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if ( end <= addr)
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continue;
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if (start <= addr && addr+size < end) {
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if (rwflag)
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ret = (prot[0] != 'r'); /* test for reading */
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else
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ret = (prot[1] != 'w'); /* test for writing */
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}
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break;
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}
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fclose( fp);
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return ret;
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}
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#else /* linux || FreeBSD */
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/* FIXME: code needed for BSD et al. */
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BOOL DEBUG_checkmap_bad(char *addr, size_t size, int rwflag)
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{
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return FALSE;
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}
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#endif /* linux || FreeBSD */
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/***********************************************************************
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* DEBUG_IsBadReadPtr
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*
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* Check if we are allowed to read memory at 'address'.
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*/
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BOOL DEBUG_IsBadReadPtr( const DBG_ADDR *address, int size )
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{
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if (!IS_SELECTOR_V86(address->seg))
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if (address->seg) /* segmented addr */
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{
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if (IsBadReadPtr16( (SEGPTR)MAKELONG( (WORD)address->off,
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(WORD)address->seg ), size ))
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return TRUE;
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}
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return DEBUG_checkmap_bad( DBG_ADDR_TO_LIN(address), size, 1);
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}
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/***********************************************************************
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* DEBUG_IsBadWritePtr
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*
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* Check if we are allowed to write memory at 'address'.
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*/
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BOOL DEBUG_IsBadWritePtr( const DBG_ADDR *address, int size )
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{
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if (!IS_SELECTOR_V86(address->seg))
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if (address->seg) /* segmented addr */
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{
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/* Note: we use IsBadReadPtr here because we are */
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/* always allowed to write to read-only segments */
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if (IsBadReadPtr16( (SEGPTR)MAKELONG( (WORD)address->off,
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(WORD)address->seg ), size ))
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return TRUE;
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}
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return DEBUG_checkmap_bad( DBG_ADDR_TO_LIN(address), size, 0);
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}
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/***********************************************************************
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* DEBUG_ReadMemory
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*
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* Read a memory value.
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*/
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int DEBUG_ReadMemory( const DBG_ADDR *address )
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{
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DBG_ADDR addr = *address;
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DBG_FIX_ADDR_SEG( &addr, DS_reg(&DEBUG_context) );
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if (!DBG_CHECK_READ_PTR( &addr, sizeof(int) )) return 0;
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return *(int *)DBG_ADDR_TO_LIN( &addr );
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}
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/***********************************************************************
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* DEBUG_WriteMemory
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*
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* Store a value in memory.
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*/
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void DEBUG_WriteMemory( const DBG_ADDR *address, int value )
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{
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DBG_ADDR addr = *address;
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DBG_FIX_ADDR_SEG( &addr, DS_reg(&DEBUG_context) );
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if (!DBG_CHECK_WRITE_PTR( &addr, sizeof(int) )) return;
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*(int *)DBG_ADDR_TO_LIN( &addr ) = value;
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}
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/***********************************************************************
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* DEBUG_ExamineMemory
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*
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* Implementation of the 'x' command.
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*/
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void DEBUG_ExamineMemory( const DBG_ADDR *address, int count, char format )
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{
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DBG_ADDR addr = * address;
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unsigned int * dump;
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int i;
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unsigned char * pnt;
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unsigned int seg2;
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struct datatype * testtype;
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unsigned short int * wdump;
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DBG_FIX_ADDR_SEG( &addr, (format == 'i') ?
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CS_reg(&DEBUG_context) : DS_reg(&DEBUG_context) );
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/*
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* Dereference pointer to get actual memory address we need to be
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* reading. We will use the same segment as what we have already,
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* and hope that this is a sensible thing to do.
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*/
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if( addr.type != NULL )
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{
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if( addr.type == DEBUG_TypeIntConst )
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{
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/*
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* We know that we have the actual offset stored somewhere
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* else in 32-bit space. Grab it, and we
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* should be all set.
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*/
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seg2 = addr.seg;
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addr.seg = 0;
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addr.off = DEBUG_GetExprValue(&addr, NULL);
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addr.seg = seg2;
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}
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else
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{
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if (!DBG_CHECK_READ_PTR( &addr, 1 )) return;
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DEBUG_TypeDerefPointer(&addr, &testtype);
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if( testtype != NULL || addr.type == DEBUG_TypeIntConst )
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{
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addr.off = DEBUG_GetExprValue(&addr, NULL);
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}
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}
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}
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else if (!addr.seg && !addr.off)
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{
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fprintf(stderr,"Invalid expression\n");
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return;
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}
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if (format != 'i' && count > 1)
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{
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DEBUG_PrintAddress( &addr, dbg_mode, FALSE );
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fprintf(stderr,": ");
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}
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pnt = DBG_ADDR_TO_LIN( &addr );
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switch(format)
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{
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case 'u': {
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WCHAR *ptr = (WCHAR*)pnt;
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if (count == 1) count = 256;
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while (count--)
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{
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if (!DBG_CHECK_READ_PTR( &addr, sizeof(WCHAR) )) return;
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if (!*ptr) break;
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addr.off++;
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fputc( (char)*ptr++, stderr );
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}
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fprintf(stderr,"\n");
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return;
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}
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case 's':
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if (count == 1) count = 256;
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while (count--)
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{
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if (!DBG_CHECK_READ_PTR( &addr, sizeof(char) )) return;
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if (!*pnt) break;
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addr.off++;
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fputc( *pnt++, stderr );
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}
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fprintf(stderr,"\n");
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return;
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case 'i':
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while (count--)
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{
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DEBUG_PrintAddress( &addr, dbg_mode, TRUE );
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fprintf(stderr,": ");
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if (!DBG_CHECK_READ_PTR( &addr, 1 )) return;
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DEBUG_Disasm( &addr, TRUE );
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fprintf(stderr,"\n");
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}
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return;
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case 'x':
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dump = (unsigned int *)pnt;
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for(i=0; i<count; i++)
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{
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if (!DBG_CHECK_READ_PTR( &addr, sizeof(int) )) return;
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fprintf(stderr," %8.8x", *dump++);
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addr.off += sizeof(int);
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if ((i % 8) == 7)
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{
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fprintf(stderr,"\n");
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DEBUG_PrintAddress( &addr, dbg_mode, FALSE );
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fprintf(stderr,": ");
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}
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}
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fprintf(stderr,"\n");
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return;
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case 'd':
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dump = (unsigned int *)pnt;
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for(i=0; i<count; i++)
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{
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if (!DBG_CHECK_READ_PTR( &addr, sizeof(int) )) return;
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fprintf(stderr," %d", *dump++);
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addr.off += sizeof(int);
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if ((i % 8) == 7)
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{
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fprintf(stderr,"\n");
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DEBUG_PrintAddress( &addr, dbg_mode, FALSE );
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fprintf(stderr,": ");
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}
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}
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fprintf(stderr,"\n");
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return;
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case 'w':
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wdump = (unsigned short *)pnt;
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for(i=0; i<count; i++)
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{
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if (!DBG_CHECK_READ_PTR( &addr, sizeof(short) )) return;
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fprintf(stderr," %04x", *wdump++);
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addr.off += sizeof(short);
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if ((i % 8) == 7)
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{
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fprintf(stderr,"\n");
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DEBUG_PrintAddress( &addr, dbg_mode, FALSE );
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fprintf(stderr,": ");
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}
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}
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fprintf(stderr,"\n");
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return;
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case 'c':
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for(i=0; i<count; i++)
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{
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if (!DBG_CHECK_READ_PTR( &addr, sizeof(char) )) return;
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if(*pnt < 0x20)
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{
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fprintf(stderr," ");
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pnt++;
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}
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else fprintf(stderr," %c", *pnt++);
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addr.off++;
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if ((i % 32) == 31)
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{
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fprintf(stderr,"\n");
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DEBUG_PrintAddress( &addr, dbg_mode, FALSE );
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fprintf(stderr,": ");
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}
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}
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fprintf(stderr,"\n");
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return;
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case 'b':
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for(i=0; i<count; i++)
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{
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if (!DBG_CHECK_READ_PTR( &addr, sizeof(char) )) return;
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fprintf(stderr," %02x", (*pnt++) & 0xff);
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addr.off++;
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if ((i % 16) == 15)
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{
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fprintf(stderr,"\n");
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DEBUG_PrintAddress( &addr, dbg_mode, FALSE );
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fprintf(stderr,": ");
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}
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}
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fprintf(stderr,"\n");
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return;
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}
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}
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