2 * Debugger memory handling
4 * Copyright 1993 Eric Youngdale
5 * Copyright 1995 Alexandre Julliard
14 /************************************************************
16 * Check if linear pointer in [addr, addr+size[
20 ************************************************************/
22 #if defined(linux) || defined(__FreeBSD__)
23 BOOL32 DEBUG_checkmap_bad( const char *addr, size_t size, int rwflag)
26 char buf[80]; /* temporary line buffer */
27 char prot[5]; /* protection string */
33 The entries in /proc/self/maps are of the form:
34 08000000-08002000 r-xp 00000000 03:41 2361
35 08002000-08003000 rw-p 00001000 03:41 2361
36 08003000-08005000 rwxp 00000000 00:00 0
37 40000000-40005000 r-xp 00000000 03:41 67219
38 40005000-40006000 rw-p 00004000 03:41 67219
39 40006000-40007000 rw-p 00000000 00:00 0
41 start end perm ??? major:minor inode
43 Only permissions start and end are used here
47 % cat /proc/curproc/map
48 start end resident private perm type
49 0x1000 0xe000 12 0 r-x COW vnode
50 0xe000 0x10000 2 2 rwx COW vnode
51 0x10000 0x27000 4 4 rwx default
52 0x800e000 0x800f000 1 1 rw- default
53 0xefbde000 0xefbfe000 1 1 rwx default
61 if (!(fp = fopen("/proc/self/maps", "r")))
63 if (!(fp = fopen("/proc/curproc/map", "r")))
67 while (fgets( buf, 79, fp)) {
69 sscanf(buf, "%x-%x %3s", (int *) &start, (int *) &end, prot);
71 sscanf(buf, "%x %x %*d %*d %3s", (int *) &start, (int *) &end, prot);
75 if (start <= addr && addr+size < end) {
77 ret = (prot[0] != 'r'); /* test for reading */
79 ret = (prot[1] != 'w'); /* test for writing */
86 #else /* linux || FreeBSD */
87 /* FIXME: code needed for BSD et al. */
88 BOOL32 DEBUG_checkmap_bad(char *addr, size_t size, int rwflag)
92 #endif /* linux || FreeBSD */
95 /***********************************************************************
98 * Check if we are allowed to read memory at 'address'.
100 BOOL32 DEBUG_IsBadReadPtr( const DBG_ADDR *address, int size )
102 if (!IS_SELECTOR_V86(address->seg))
103 if (address->seg) /* segmented addr */
105 if (IsBadReadPtr16( (SEGPTR)MAKELONG( (WORD)address->off,
106 (WORD)address->seg ), size ))
109 return DEBUG_checkmap_bad( DBG_ADDR_TO_LIN(address), size, 1);
113 /***********************************************************************
114 * DEBUG_IsBadWritePtr
116 * Check if we are allowed to write memory at 'address'.
118 BOOL32 DEBUG_IsBadWritePtr( const DBG_ADDR *address, int size )
120 if (!IS_SELECTOR_V86(address->seg))
121 if (address->seg) /* segmented addr */
123 /* Note: we use IsBadReadPtr here because we are */
124 /* always allowed to write to read-only segments */
125 if (IsBadReadPtr16( (SEGPTR)MAKELONG( (WORD)address->off,
126 (WORD)address->seg ), size ))
129 return DEBUG_checkmap_bad( DBG_ADDR_TO_LIN(address), size, 0);
133 /***********************************************************************
136 * Read a memory value.
138 int DEBUG_ReadMemory( const DBG_ADDR *address )
140 DBG_ADDR addr = *address;
142 DBG_FIX_ADDR_SEG( &addr, DS_reg(&DEBUG_context) );
143 if (!DBG_CHECK_READ_PTR( &addr, sizeof(int) )) return 0;
144 return *(int *)DBG_ADDR_TO_LIN( &addr );
148 /***********************************************************************
151 * Store a value in memory.
153 void DEBUG_WriteMemory( const DBG_ADDR *address, int value )
155 DBG_ADDR addr = *address;
157 DBG_FIX_ADDR_SEG( &addr, DS_reg(&DEBUG_context) );
158 if (!DBG_CHECK_WRITE_PTR( &addr, sizeof(int) )) return;
159 *(int *)DBG_ADDR_TO_LIN( &addr ) = value;
163 /***********************************************************************
164 * DEBUG_ExamineMemory
166 * Implementation of the 'x' command.
168 void DEBUG_ExamineMemory( const DBG_ADDR *address, int count, char format )
170 DBG_ADDR addr = * address;
175 struct datatype * testtype;
176 unsigned short int * wdump;
178 DBG_FIX_ADDR_SEG( &addr, (format == 'i') ?
179 CS_reg(&DEBUG_context) : DS_reg(&DEBUG_context) );
182 * Dereference pointer to get actual memory address we need to be
183 * reading. We will use the same segment as what we have already,
184 * and hope that this is a sensible thing to do.
186 if( addr.type != NULL )
188 if( addr.type == DEBUG_TypeIntConst )
191 * We know that we have the actual offset stored somewhere
192 * else in 32-bit space. Grab it, and we
197 addr.off = DEBUG_GetExprValue(&addr, NULL);
202 if (!DBG_CHECK_READ_PTR( &addr, 1 )) return;
203 DEBUG_TypeDerefPointer(&addr, &testtype);
204 if( testtype != NULL || addr.type == DEBUG_TypeIntConst )
206 addr.off = DEBUG_GetExprValue(&addr, NULL);
210 else if (!addr.seg && !addr.off)
212 fprintf(stderr,"Invalid expression\n");
216 if (format != 'i' && count > 1)
218 DEBUG_PrintAddress( &addr, dbg_mode, FALSE );
219 fprintf(stderr,": ");
222 pnt = DBG_ADDR_TO_LIN( &addr );
227 WCHAR *ptr = (WCHAR*)pnt;
228 if (count == 1) count = 256;
231 if (!DBG_CHECK_READ_PTR( &addr, sizeof(WCHAR) )) return;
234 fputc( (char)*ptr++, stderr );
236 fprintf(stderr,"\n");
240 if (count == 1) count = 256;
243 if (!DBG_CHECK_READ_PTR( &addr, sizeof(char) )) return;
246 fputc( *pnt++, stderr );
248 fprintf(stderr,"\n");
254 DEBUG_PrintAddress( &addr, dbg_mode, TRUE );
255 fprintf(stderr,": ");
256 if (!DBG_CHECK_READ_PTR( &addr, 1 )) return;
257 DEBUG_Disasm( &addr, TRUE );
258 fprintf(stderr,"\n");
262 dump = (unsigned int *)pnt;
263 for(i=0; i<count; i++)
265 if (!DBG_CHECK_READ_PTR( &addr, sizeof(int) )) return;
266 fprintf(stderr," %8.8x", *dump++);
267 addr.off += sizeof(int);
270 fprintf(stderr,"\n");
271 DEBUG_PrintAddress( &addr, dbg_mode, FALSE );
272 fprintf(stderr,": ");
275 fprintf(stderr,"\n");
279 dump = (unsigned int *)pnt;
280 for(i=0; i<count; i++)
282 if (!DBG_CHECK_READ_PTR( &addr, sizeof(int) )) return;
283 fprintf(stderr," %d", *dump++);
284 addr.off += sizeof(int);
287 fprintf(stderr,"\n");
288 DEBUG_PrintAddress( &addr, dbg_mode, FALSE );
289 fprintf(stderr,": ");
292 fprintf(stderr,"\n");
296 wdump = (unsigned short *)pnt;
297 for(i=0; i<count; i++)
299 if (!DBG_CHECK_READ_PTR( &addr, sizeof(short) )) return;
300 fprintf(stderr," %04x", *wdump++);
301 addr.off += sizeof(short);
304 fprintf(stderr,"\n");
305 DEBUG_PrintAddress( &addr, dbg_mode, FALSE );
306 fprintf(stderr,": ");
309 fprintf(stderr,"\n");
313 for(i=0; i<count; i++)
315 if (!DBG_CHECK_READ_PTR( &addr, sizeof(char) )) return;
321 else fprintf(stderr," %c", *pnt++);
325 fprintf(stderr,"\n");
326 DEBUG_PrintAddress( &addr, dbg_mode, FALSE );
327 fprintf(stderr,": ");
330 fprintf(stderr,"\n");
334 for(i=0; i<count; i++)
336 if (!DBG_CHECK_READ_PTR( &addr, sizeof(char) )) return;
337 fprintf(stderr," %02x", (*pnt++) & 0xff);
341 fprintf(stderr,"\n");
342 DEBUG_PrintAddress( &addr, dbg_mode, FALSE );
343 fprintf(stderr,": ");
346 fprintf(stderr,"\n");