Commit | Line | Data |
---|---|---|
c906108c SS |
1 | /* Find a variable's value in memory, for GDB, the GNU debugger. |
2 | Copyright 1986, 87, 89, 91, 94, 95, 96, 1998 | |
3 | Free Software Foundation, Inc. | |
4 | ||
c5aa993b | 5 | This file is part of GDB. |
c906108c | 6 | |
c5aa993b JM |
7 | This program is free software; you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
c906108c | 11 | |
c5aa993b JM |
12 | This program is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
c906108c | 16 | |
c5aa993b JM |
17 | You should have received a copy of the GNU General Public License |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
21 | |
22 | #include "defs.h" | |
23 | #include "symtab.h" | |
24 | #include "gdbtypes.h" | |
25 | #include "frame.h" | |
26 | #include "value.h" | |
27 | #include "gdbcore.h" | |
28 | #include "inferior.h" | |
29 | #include "target.h" | |
30 | #include "gdb_string.h" | |
31 | #include "floatformat.h" | |
c5aa993b | 32 | #include "symfile.h" /* for overlay functions */ |
c906108c SS |
33 | |
34 | /* This is used to indicate that we don't know the format of the floating point | |
35 | number. Typically, this is useful for native ports, where the actual format | |
36 | is irrelevant, since no conversions will be taking place. */ | |
37 | ||
38 | const struct floatformat floatformat_unknown; | |
39 | ||
c906108c SS |
40 | /* Basic byte-swapping routines. GDB has needed these for a long time... |
41 | All extract a target-format integer at ADDR which is LEN bytes long. */ | |
42 | ||
43 | #if TARGET_CHAR_BIT != 8 || HOST_CHAR_BIT != 8 | |
44 | /* 8 bit characters are a pretty safe assumption these days, so we | |
45 | assume it throughout all these swapping routines. If we had to deal with | |
46 | 9 bit characters, we would need to make len be in bits and would have | |
47 | to re-write these routines... */ | |
c5aa993b | 48 | you lose |
c906108c SS |
49 | #endif |
50 | ||
a9ac8f51 AC |
51 | LONGEST |
52 | extract_signed_integer (void *addr, int len) | |
c906108c SS |
53 | { |
54 | LONGEST retval; | |
55 | unsigned char *p; | |
c5aa993b | 56 | unsigned char *startaddr = (unsigned char *) addr; |
c906108c SS |
57 | unsigned char *endaddr = startaddr + len; |
58 | ||
59 | if (len > (int) sizeof (LONGEST)) | |
60 | error ("\ | |
61 | That operation is not available on integers of more than %d bytes.", | |
62 | sizeof (LONGEST)); | |
63 | ||
64 | /* Start at the most significant end of the integer, and work towards | |
65 | the least significant. */ | |
66 | if (TARGET_BYTE_ORDER == BIG_ENDIAN) | |
67 | { | |
68 | p = startaddr; | |
69 | /* Do the sign extension once at the start. */ | |
c5aa993b | 70 | retval = ((LONGEST) * p ^ 0x80) - 0x80; |
c906108c SS |
71 | for (++p; p < endaddr; ++p) |
72 | retval = (retval << 8) | *p; | |
73 | } | |
74 | else | |
75 | { | |
76 | p = endaddr - 1; | |
77 | /* Do the sign extension once at the start. */ | |
c5aa993b | 78 | retval = ((LONGEST) * p ^ 0x80) - 0x80; |
c906108c SS |
79 | for (--p; p >= startaddr; --p) |
80 | retval = (retval << 8) | *p; | |
81 | } | |
82 | return retval; | |
83 | } | |
84 | ||
85 | ULONGEST | |
a9ac8f51 | 86 | extract_unsigned_integer (void *addr, int len) |
c906108c SS |
87 | { |
88 | ULONGEST retval; | |
89 | unsigned char *p; | |
c5aa993b | 90 | unsigned char *startaddr = (unsigned char *) addr; |
c906108c SS |
91 | unsigned char *endaddr = startaddr + len; |
92 | ||
93 | if (len > (int) sizeof (ULONGEST)) | |
94 | error ("\ | |
95 | That operation is not available on integers of more than %d bytes.", | |
96 | sizeof (ULONGEST)); | |
97 | ||
98 | /* Start at the most significant end of the integer, and work towards | |
99 | the least significant. */ | |
100 | retval = 0; | |
101 | if (TARGET_BYTE_ORDER == BIG_ENDIAN) | |
102 | { | |
103 | for (p = startaddr; p < endaddr; ++p) | |
104 | retval = (retval << 8) | *p; | |
105 | } | |
106 | else | |
107 | { | |
108 | for (p = endaddr - 1; p >= startaddr; --p) | |
109 | retval = (retval << 8) | *p; | |
110 | } | |
111 | return retval; | |
112 | } | |
113 | ||
114 | /* Sometimes a long long unsigned integer can be extracted as a | |
115 | LONGEST value. This is done so that we can print these values | |
116 | better. If this integer can be converted to a LONGEST, this | |
117 | function returns 1 and sets *PVAL. Otherwise it returns 0. */ | |
118 | ||
119 | int | |
a9ac8f51 | 120 | extract_long_unsigned_integer (void *addr, int orig_len, LONGEST *pval) |
c906108c SS |
121 | { |
122 | char *p, *first_addr; | |
123 | int len; | |
124 | ||
125 | len = orig_len; | |
126 | if (TARGET_BYTE_ORDER == BIG_ENDIAN) | |
127 | { | |
128 | for (p = (char *) addr; | |
129 | len > (int) sizeof (LONGEST) && p < (char *) addr + orig_len; | |
130 | p++) | |
131 | { | |
132 | if (*p == 0) | |
133 | len--; | |
134 | else | |
135 | break; | |
136 | } | |
137 | first_addr = p; | |
138 | } | |
139 | else | |
140 | { | |
141 | first_addr = (char *) addr; | |
142 | for (p = (char *) addr + orig_len - 1; | |
143 | len > (int) sizeof (LONGEST) && p >= (char *) addr; | |
144 | p--) | |
145 | { | |
146 | if (*p == 0) | |
147 | len--; | |
148 | else | |
149 | break; | |
150 | } | |
151 | } | |
152 | ||
153 | if (len <= (int) sizeof (LONGEST)) | |
154 | { | |
155 | *pval = (LONGEST) extract_unsigned_integer (first_addr, | |
156 | sizeof (LONGEST)); | |
157 | return 1; | |
158 | } | |
159 | ||
160 | return 0; | |
161 | } | |
162 | ||
4478b372 JB |
163 | |
164 | /* Treat the LEN bytes at ADDR as a target-format address, and return | |
165 | that address. ADDR is a buffer in the GDB process, not in the | |
166 | inferior. | |
167 | ||
168 | This function should only be used by target-specific code. It | |
169 | assumes that a pointer has the same representation as that thing's | |
170 | address represented as an integer. Some machines use word | |
171 | addresses, or similarly munged things, for certain types of | |
172 | pointers, so that assumption doesn't hold everywhere. | |
173 | ||
174 | Common code should use extract_typed_address instead, or something | |
175 | else based on POINTER_TO_ADDRESS. */ | |
176 | ||
c906108c | 177 | CORE_ADDR |
a9ac8f51 | 178 | extract_address (void *addr, int len) |
c906108c SS |
179 | { |
180 | /* Assume a CORE_ADDR can fit in a LONGEST (for now). Not sure | |
181 | whether we want this to be true eventually. */ | |
c5aa993b | 182 | return (CORE_ADDR) extract_unsigned_integer (addr, len); |
c906108c SS |
183 | } |
184 | ||
4478b372 | 185 | |
4478b372 JB |
186 | /* Treat the bytes at BUF as a pointer of type TYPE, and return the |
187 | address it represents. */ | |
188 | CORE_ADDR | |
189 | extract_typed_address (void *buf, struct type *type) | |
190 | { | |
191 | if (TYPE_CODE (type) != TYPE_CODE_PTR | |
192 | && TYPE_CODE (type) != TYPE_CODE_REF) | |
c0aba12e | 193 | internal_error ("findvar.c (extract_typed_address): " |
4478b372 JB |
194 | "type is not a pointer or reference"); |
195 | ||
196 | return POINTER_TO_ADDRESS (type, buf); | |
197 | } | |
198 | ||
199 | ||
c906108c | 200 | void |
a9ac8f51 | 201 | store_signed_integer (void *addr, int len, LONGEST val) |
c906108c SS |
202 | { |
203 | unsigned char *p; | |
c5aa993b | 204 | unsigned char *startaddr = (unsigned char *) addr; |
c906108c SS |
205 | unsigned char *endaddr = startaddr + len; |
206 | ||
207 | /* Start at the least significant end of the integer, and work towards | |
208 | the most significant. */ | |
209 | if (TARGET_BYTE_ORDER == BIG_ENDIAN) | |
210 | { | |
211 | for (p = endaddr - 1; p >= startaddr; --p) | |
212 | { | |
213 | *p = val & 0xff; | |
214 | val >>= 8; | |
215 | } | |
216 | } | |
217 | else | |
218 | { | |
219 | for (p = startaddr; p < endaddr; ++p) | |
220 | { | |
221 | *p = val & 0xff; | |
222 | val >>= 8; | |
223 | } | |
224 | } | |
225 | } | |
226 | ||
227 | void | |
a9ac8f51 | 228 | store_unsigned_integer (void *addr, int len, ULONGEST val) |
c906108c SS |
229 | { |
230 | unsigned char *p; | |
c5aa993b | 231 | unsigned char *startaddr = (unsigned char *) addr; |
c906108c SS |
232 | unsigned char *endaddr = startaddr + len; |
233 | ||
234 | /* Start at the least significant end of the integer, and work towards | |
235 | the most significant. */ | |
236 | if (TARGET_BYTE_ORDER == BIG_ENDIAN) | |
237 | { | |
238 | for (p = endaddr - 1; p >= startaddr; --p) | |
239 | { | |
240 | *p = val & 0xff; | |
241 | val >>= 8; | |
242 | } | |
243 | } | |
244 | else | |
245 | { | |
246 | for (p = startaddr; p < endaddr; ++p) | |
247 | { | |
248 | *p = val & 0xff; | |
249 | val >>= 8; | |
250 | } | |
251 | } | |
252 | } | |
253 | ||
4478b372 JB |
254 | /* Store the address VAL as a LEN-byte value in target byte order at |
255 | ADDR. ADDR is a buffer in the GDB process, not in the inferior. | |
256 | ||
257 | This function should only be used by target-specific code. It | |
258 | assumes that a pointer has the same representation as that thing's | |
259 | address represented as an integer. Some machines use word | |
260 | addresses, or similarly munged things, for certain types of | |
261 | pointers, so that assumption doesn't hold everywhere. | |
262 | ||
263 | Common code should use store_typed_address instead, or something else | |
264 | based on ADDRESS_TO_POINTER. */ | |
c906108c | 265 | void |
a9ac8f51 | 266 | store_address (void *addr, int len, LONGEST val) |
c906108c | 267 | { |
c906108c SS |
268 | store_unsigned_integer (addr, len, val); |
269 | } | |
4478b372 JB |
270 | |
271 | ||
4478b372 JB |
272 | /* Store the address ADDR as a pointer of type TYPE at BUF, in target |
273 | form. */ | |
274 | void | |
275 | store_typed_address (void *buf, struct type *type, CORE_ADDR addr) | |
276 | { | |
277 | if (TYPE_CODE (type) != TYPE_CODE_PTR | |
278 | && TYPE_CODE (type) != TYPE_CODE_REF) | |
c0aba12e | 279 | internal_error ("findvar.c (store_typed_address): " |
4478b372 JB |
280 | "type is not a pointer or reference"); |
281 | ||
282 | ADDRESS_TO_POINTER (type, buf, addr); | |
283 | } | |
284 | ||
285 | ||
286 | ||
c906108c | 287 | \f |
c906108c SS |
288 | /* Extract a floating-point number from a target-order byte-stream at ADDR. |
289 | Returns the value as type DOUBLEST. | |
290 | ||
291 | If the host and target formats agree, we just copy the raw data into the | |
292 | appropriate type of variable and return, letting the host increase precision | |
293 | as necessary. Otherwise, we call the conversion routine and let it do the | |
294 | dirty work. */ | |
295 | ||
296 | DOUBLEST | |
3db87ba3 | 297 | extract_floating (void *addr, int len) |
c906108c SS |
298 | { |
299 | DOUBLEST dretval; | |
300 | ||
3db87ba3 | 301 | if (len * TARGET_CHAR_BIT == TARGET_FLOAT_BIT) |
c906108c SS |
302 | { |
303 | if (HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT) | |
304 | { | |
305 | float retval; | |
306 | ||
307 | memcpy (&retval, addr, sizeof (retval)); | |
308 | return retval; | |
309 | } | |
310 | else | |
311 | floatformat_to_doublest (TARGET_FLOAT_FORMAT, addr, &dretval); | |
312 | } | |
3db87ba3 | 313 | else if (len * TARGET_CHAR_BIT == TARGET_DOUBLE_BIT) |
c906108c SS |
314 | { |
315 | if (HOST_DOUBLE_FORMAT == TARGET_DOUBLE_FORMAT) | |
316 | { | |
317 | double retval; | |
318 | ||
319 | memcpy (&retval, addr, sizeof (retval)); | |
320 | return retval; | |
321 | } | |
322 | else | |
323 | floatformat_to_doublest (TARGET_DOUBLE_FORMAT, addr, &dretval); | |
324 | } | |
3db87ba3 | 325 | else if (len * TARGET_CHAR_BIT == TARGET_LONG_DOUBLE_BIT) |
c906108c SS |
326 | { |
327 | if (HOST_LONG_DOUBLE_FORMAT == TARGET_LONG_DOUBLE_FORMAT) | |
328 | { | |
329 | DOUBLEST retval; | |
330 | ||
331 | memcpy (&retval, addr, sizeof (retval)); | |
332 | return retval; | |
333 | } | |
334 | else | |
335 | floatformat_to_doublest (TARGET_LONG_DOUBLE_FORMAT, addr, &dretval); | |
336 | } | |
337 | else | |
338 | { | |
339 | error ("Can't deal with a floating point number of %d bytes.", len); | |
340 | } | |
341 | ||
342 | return dretval; | |
343 | } | |
344 | ||
345 | void | |
3db87ba3 | 346 | store_floating (void *addr, int len, DOUBLEST val) |
c906108c | 347 | { |
3db87ba3 | 348 | if (len * TARGET_CHAR_BIT == TARGET_FLOAT_BIT) |
c906108c SS |
349 | { |
350 | if (HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT) | |
351 | { | |
352 | float floatval = val; | |
353 | ||
354 | memcpy (addr, &floatval, sizeof (floatval)); | |
355 | } | |
356 | else | |
357 | floatformat_from_doublest (TARGET_FLOAT_FORMAT, &val, addr); | |
358 | } | |
3db87ba3 | 359 | else if (len * TARGET_CHAR_BIT == TARGET_DOUBLE_BIT) |
c906108c SS |
360 | { |
361 | if (HOST_DOUBLE_FORMAT == TARGET_DOUBLE_FORMAT) | |
362 | { | |
363 | double doubleval = val; | |
364 | ||
365 | memcpy (addr, &doubleval, sizeof (doubleval)); | |
366 | } | |
367 | else | |
368 | floatformat_from_doublest (TARGET_DOUBLE_FORMAT, &val, addr); | |
369 | } | |
3db87ba3 | 370 | else if (len * TARGET_CHAR_BIT == TARGET_LONG_DOUBLE_BIT) |
c906108c SS |
371 | { |
372 | if (HOST_LONG_DOUBLE_FORMAT == TARGET_LONG_DOUBLE_FORMAT) | |
373 | memcpy (addr, &val, sizeof (val)); | |
374 | else | |
375 | floatformat_from_doublest (TARGET_LONG_DOUBLE_FORMAT, &val, addr); | |
376 | } | |
377 | else | |
378 | { | |
379 | error ("Can't deal with a floating point number of %d bytes.", len); | |
380 | } | |
381 | } | |
c906108c SS |
382 | |
383 | /* Return a `value' with the contents of register REGNUM | |
384 | in its virtual format, with the type specified by | |
385 | REGISTER_VIRTUAL_TYPE. | |
386 | ||
387 | NOTE: returns NULL if register value is not available. | |
388 | Caller will check return value or die! */ | |
389 | ||
390 | value_ptr | |
fba45db2 | 391 | value_of_register (int regnum) |
c906108c SS |
392 | { |
393 | CORE_ADDR addr; | |
394 | int optim; | |
395 | register value_ptr reg_val; | |
396 | char raw_buffer[MAX_REGISTER_RAW_SIZE]; | |
397 | enum lval_type lval; | |
398 | ||
399 | get_saved_register (raw_buffer, &optim, &addr, | |
400 | selected_frame, regnum, &lval); | |
401 | ||
32178cab | 402 | if (register_cached (regnum) < 0) |
c5aa993b | 403 | return NULL; /* register value not available */ |
c906108c SS |
404 | |
405 | reg_val = allocate_value (REGISTER_VIRTUAL_TYPE (regnum)); | |
406 | ||
407 | /* Convert raw data to virtual format if necessary. */ | |
408 | ||
c906108c SS |
409 | if (REGISTER_CONVERTIBLE (regnum)) |
410 | { | |
411 | REGISTER_CONVERT_TO_VIRTUAL (regnum, REGISTER_VIRTUAL_TYPE (regnum), | |
412 | raw_buffer, VALUE_CONTENTS_RAW (reg_val)); | |
413 | } | |
392a587b JM |
414 | else if (REGISTER_RAW_SIZE (regnum) == REGISTER_VIRTUAL_SIZE (regnum)) |
415 | memcpy (VALUE_CONTENTS_RAW (reg_val), raw_buffer, | |
416 | REGISTER_RAW_SIZE (regnum)); | |
c906108c | 417 | else |
96baa820 JM |
418 | internal_error ("Register \"%s\" (%d) has conflicting raw (%d) and virtual (%d) size", |
419 | REGISTER_NAME (regnum), | |
420 | regnum, | |
421 | REGISTER_RAW_SIZE (regnum), | |
422 | REGISTER_VIRTUAL_SIZE (regnum)); | |
c906108c SS |
423 | VALUE_LVAL (reg_val) = lval; |
424 | VALUE_ADDRESS (reg_val) = addr; | |
425 | VALUE_REGNO (reg_val) = regnum; | |
426 | VALUE_OPTIMIZED_OUT (reg_val) = optim; | |
427 | return reg_val; | |
428 | } | |
4478b372 JB |
429 | |
430 | /* Given a pointer of type TYPE in target form in BUF, return the | |
431 | address it represents. */ | |
432 | CORE_ADDR | |
ac2e2ef7 | 433 | unsigned_pointer_to_address (struct type *type, void *buf) |
4478b372 JB |
434 | { |
435 | return extract_address (buf, TYPE_LENGTH (type)); | |
436 | } | |
437 | ||
ac2e2ef7 AC |
438 | CORE_ADDR |
439 | signed_pointer_to_address (struct type *type, void *buf) | |
440 | { | |
441 | return extract_signed_integer (buf, TYPE_LENGTH (type)); | |
442 | } | |
4478b372 JB |
443 | |
444 | /* Given an address, store it as a pointer of type TYPE in target | |
445 | format in BUF. */ | |
446 | void | |
ac2e2ef7 | 447 | unsigned_address_to_pointer (struct type *type, void *buf, CORE_ADDR addr) |
4478b372 JB |
448 | { |
449 | store_address (buf, TYPE_LENGTH (type), addr); | |
450 | } | |
451 | ||
ac2e2ef7 AC |
452 | void |
453 | address_to_signed_pointer (struct type *type, void *buf, CORE_ADDR addr) | |
454 | { | |
455 | store_signed_integer (buf, TYPE_LENGTH (type), addr); | |
456 | } | |
c906108c SS |
457 | \f |
458 | /* Will calling read_var_value or locate_var_value on SYM end | |
459 | up caring what frame it is being evaluated relative to? SYM must | |
460 | be non-NULL. */ | |
461 | int | |
fba45db2 | 462 | symbol_read_needs_frame (struct symbol *sym) |
c906108c SS |
463 | { |
464 | switch (SYMBOL_CLASS (sym)) | |
465 | { | |
466 | /* All cases listed explicitly so that gcc -Wall will detect it if | |
c5aa993b | 467 | we failed to consider one. */ |
c906108c SS |
468 | case LOC_REGISTER: |
469 | case LOC_ARG: | |
470 | case LOC_REF_ARG: | |
471 | case LOC_REGPARM: | |
472 | case LOC_REGPARM_ADDR: | |
473 | case LOC_LOCAL: | |
474 | case LOC_LOCAL_ARG: | |
475 | case LOC_BASEREG: | |
476 | case LOC_BASEREG_ARG: | |
477 | case LOC_THREAD_LOCAL_STATIC: | |
478 | return 1; | |
479 | ||
480 | case LOC_UNDEF: | |
481 | case LOC_CONST: | |
482 | case LOC_STATIC: | |
483 | case LOC_INDIRECT: | |
484 | case LOC_TYPEDEF: | |
485 | ||
486 | case LOC_LABEL: | |
487 | /* Getting the address of a label can be done independently of the block, | |
c5aa993b JM |
488 | even if some *uses* of that address wouldn't work so well without |
489 | the right frame. */ | |
c906108c SS |
490 | |
491 | case LOC_BLOCK: | |
492 | case LOC_CONST_BYTES: | |
493 | case LOC_UNRESOLVED: | |
494 | case LOC_OPTIMIZED_OUT: | |
495 | return 0; | |
496 | } | |
497 | return 1; | |
498 | } | |
499 | ||
500 | /* Given a struct symbol for a variable, | |
501 | and a stack frame id, read the value of the variable | |
502 | and return a (pointer to a) struct value containing the value. | |
503 | If the variable cannot be found, return a zero pointer. | |
504 | If FRAME is NULL, use the selected_frame. */ | |
505 | ||
506 | value_ptr | |
fba45db2 | 507 | read_var_value (register struct symbol *var, struct frame_info *frame) |
c906108c SS |
508 | { |
509 | register value_ptr v; | |
510 | struct type *type = SYMBOL_TYPE (var); | |
511 | CORE_ADDR addr; | |
512 | register int len; | |
513 | ||
514 | v = allocate_value (type); | |
515 | VALUE_LVAL (v) = lval_memory; /* The most likely possibility. */ | |
516 | VALUE_BFD_SECTION (v) = SYMBOL_BFD_SECTION (var); | |
517 | ||
518 | len = TYPE_LENGTH (type); | |
519 | ||
c5aa993b JM |
520 | if (frame == NULL) |
521 | frame = selected_frame; | |
c906108c SS |
522 | |
523 | switch (SYMBOL_CLASS (var)) | |
524 | { | |
525 | case LOC_CONST: | |
526 | /* Put the constant back in target format. */ | |
527 | store_signed_integer (VALUE_CONTENTS_RAW (v), len, | |
528 | (LONGEST) SYMBOL_VALUE (var)); | |
529 | VALUE_LVAL (v) = not_lval; | |
530 | return v; | |
531 | ||
532 | case LOC_LABEL: | |
533 | /* Put the constant back in target format. */ | |
534 | if (overlay_debugging) | |
4478b372 JB |
535 | { |
536 | CORE_ADDR addr | |
537 | = symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (var), | |
538 | SYMBOL_BFD_SECTION (var)); | |
539 | store_typed_address (VALUE_CONTENTS_RAW (v), type, addr); | |
540 | } | |
c906108c | 541 | else |
4478b372 JB |
542 | store_typed_address (VALUE_CONTENTS_RAW (v), type, |
543 | SYMBOL_VALUE_ADDRESS (var)); | |
c906108c SS |
544 | VALUE_LVAL (v) = not_lval; |
545 | return v; | |
546 | ||
547 | case LOC_CONST_BYTES: | |
548 | { | |
549 | char *bytes_addr; | |
550 | bytes_addr = SYMBOL_VALUE_BYTES (var); | |
551 | memcpy (VALUE_CONTENTS_RAW (v), bytes_addr, len); | |
552 | VALUE_LVAL (v) = not_lval; | |
553 | return v; | |
554 | } | |
555 | ||
556 | case LOC_STATIC: | |
557 | if (overlay_debugging) | |
558 | addr = symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (var), | |
559 | SYMBOL_BFD_SECTION (var)); | |
560 | else | |
561 | addr = SYMBOL_VALUE_ADDRESS (var); | |
562 | break; | |
563 | ||
564 | case LOC_INDIRECT: | |
565 | /* The import slot does not have a real address in it from the | |
566 | dynamic loader (dld.sl on HP-UX), if the target hasn't begun | |
c5aa993b | 567 | execution yet, so check for that. */ |
c906108c | 568 | if (!target_has_execution) |
c5aa993b | 569 | error ("\ |
c906108c SS |
570 | Attempt to access variable defined in different shared object or load module when\n\ |
571 | addresses have not been bound by the dynamic loader. Try again when executable is running."); | |
c5aa993b | 572 | |
c906108c SS |
573 | addr = SYMBOL_VALUE_ADDRESS (var); |
574 | addr = read_memory_unsigned_integer | |
575 | (addr, TARGET_PTR_BIT / TARGET_CHAR_BIT); | |
576 | break; | |
577 | ||
578 | case LOC_ARG: | |
579 | if (frame == NULL) | |
580 | return 0; | |
581 | addr = FRAME_ARGS_ADDRESS (frame); | |
582 | if (!addr) | |
583 | return 0; | |
584 | addr += SYMBOL_VALUE (var); | |
585 | break; | |
586 | ||
587 | case LOC_REF_ARG: | |
588 | if (frame == NULL) | |
589 | return 0; | |
590 | addr = FRAME_ARGS_ADDRESS (frame); | |
591 | if (!addr) | |
592 | return 0; | |
593 | addr += SYMBOL_VALUE (var); | |
594 | addr = read_memory_unsigned_integer | |
595 | (addr, TARGET_PTR_BIT / TARGET_CHAR_BIT); | |
596 | break; | |
597 | ||
598 | case LOC_LOCAL: | |
599 | case LOC_LOCAL_ARG: | |
600 | if (frame == NULL) | |
601 | return 0; | |
602 | addr = FRAME_LOCALS_ADDRESS (frame); | |
603 | addr += SYMBOL_VALUE (var); | |
604 | break; | |
605 | ||
606 | case LOC_BASEREG: | |
607 | case LOC_BASEREG_ARG: | |
608 | { | |
609 | char buf[MAX_REGISTER_RAW_SIZE]; | |
610 | get_saved_register (buf, NULL, NULL, frame, SYMBOL_BASEREG (var), | |
611 | NULL); | |
612 | addr = extract_address (buf, REGISTER_RAW_SIZE (SYMBOL_BASEREG (var))); | |
613 | addr += SYMBOL_VALUE (var); | |
614 | break; | |
615 | } | |
c5aa993b | 616 | |
c906108c SS |
617 | case LOC_THREAD_LOCAL_STATIC: |
618 | { | |
c5aa993b JM |
619 | char buf[MAX_REGISTER_RAW_SIZE]; |
620 | ||
621 | get_saved_register (buf, NULL, NULL, frame, SYMBOL_BASEREG (var), | |
c906108c | 622 | NULL); |
c5aa993b JM |
623 | addr = extract_address (buf, REGISTER_RAW_SIZE (SYMBOL_BASEREG (var))); |
624 | addr += SYMBOL_VALUE (var); | |
625 | break; | |
c906108c | 626 | } |
c5aa993b | 627 | |
c906108c SS |
628 | case LOC_TYPEDEF: |
629 | error ("Cannot look up value of a typedef"); | |
630 | break; | |
631 | ||
632 | case LOC_BLOCK: | |
633 | if (overlay_debugging) | |
c5aa993b | 634 | VALUE_ADDRESS (v) = symbol_overlayed_address |
c906108c SS |
635 | (BLOCK_START (SYMBOL_BLOCK_VALUE (var)), SYMBOL_BFD_SECTION (var)); |
636 | else | |
637 | VALUE_ADDRESS (v) = BLOCK_START (SYMBOL_BLOCK_VALUE (var)); | |
638 | return v; | |
639 | ||
640 | case LOC_REGISTER: | |
641 | case LOC_REGPARM: | |
642 | case LOC_REGPARM_ADDR: | |
643 | { | |
644 | struct block *b; | |
645 | int regno = SYMBOL_VALUE (var); | |
646 | value_ptr regval; | |
647 | ||
648 | if (frame == NULL) | |
649 | return 0; | |
650 | b = get_frame_block (frame); | |
651 | ||
652 | if (SYMBOL_CLASS (var) == LOC_REGPARM_ADDR) | |
653 | { | |
654 | regval = value_from_register (lookup_pointer_type (type), | |
c5aa993b | 655 | regno, |
c906108c SS |
656 | frame); |
657 | ||
658 | if (regval == NULL) | |
659 | error ("Value of register variable not available."); | |
660 | ||
c5aa993b | 661 | addr = value_as_pointer (regval); |
c906108c SS |
662 | VALUE_LVAL (v) = lval_memory; |
663 | } | |
664 | else | |
665 | { | |
666 | regval = value_from_register (type, regno, frame); | |
667 | ||
668 | if (regval == NULL) | |
669 | error ("Value of register variable not available."); | |
670 | return regval; | |
671 | } | |
672 | } | |
673 | break; | |
674 | ||
675 | case LOC_UNRESOLVED: | |
676 | { | |
677 | struct minimal_symbol *msym; | |
678 | ||
679 | msym = lookup_minimal_symbol (SYMBOL_NAME (var), NULL, NULL); | |
680 | if (msym == NULL) | |
681 | return 0; | |
682 | if (overlay_debugging) | |
683 | addr = symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (msym), | |
684 | SYMBOL_BFD_SECTION (msym)); | |
685 | else | |
686 | addr = SYMBOL_VALUE_ADDRESS (msym); | |
687 | } | |
688 | break; | |
689 | ||
690 | case LOC_OPTIMIZED_OUT: | |
691 | VALUE_LVAL (v) = not_lval; | |
692 | VALUE_OPTIMIZED_OUT (v) = 1; | |
693 | return v; | |
694 | ||
695 | default: | |
696 | error ("Cannot look up value of a botched symbol."); | |
697 | break; | |
698 | } | |
699 | ||
700 | VALUE_ADDRESS (v) = addr; | |
701 | VALUE_LAZY (v) = 1; | |
702 | return v; | |
703 | } | |
704 | ||
705 | /* Return a value of type TYPE, stored in register REGNUM, in frame | |
0f2c5ba5 | 706 | FRAME. |
c906108c SS |
707 | |
708 | NOTE: returns NULL if register value is not available. | |
709 | Caller will check return value or die! */ | |
710 | ||
711 | value_ptr | |
fba45db2 | 712 | value_from_register (struct type *type, int regnum, struct frame_info *frame) |
c906108c | 713 | { |
c5aa993b | 714 | char raw_buffer[MAX_REGISTER_RAW_SIZE]; |
c906108c SS |
715 | CORE_ADDR addr; |
716 | int optim; | |
717 | value_ptr v = allocate_value (type); | |
718 | char *value_bytes = 0; | |
719 | int value_bytes_copied = 0; | |
720 | int num_storage_locs; | |
721 | enum lval_type lval; | |
722 | int len; | |
723 | ||
724 | CHECK_TYPEDEF (type); | |
725 | len = TYPE_LENGTH (type); | |
726 | ||
0f2c5ba5 MS |
727 | /* Pointers on D10V are really only 16 bits, |
728 | but we lie to gdb elsewhere... */ | |
da59e081 JM |
729 | if (GDB_TARGET_IS_D10V && TYPE_CODE (type) == TYPE_CODE_PTR) |
730 | len = 2; | |
731 | ||
c906108c SS |
732 | VALUE_REGNO (v) = regnum; |
733 | ||
734 | num_storage_locs = (len > REGISTER_VIRTUAL_SIZE (regnum) ? | |
735 | ((len - 1) / REGISTER_RAW_SIZE (regnum)) + 1 : | |
736 | 1); | |
737 | ||
738 | if (num_storage_locs > 1 | |
739 | #ifdef GDB_TARGET_IS_H8500 | |
740 | || TYPE_CODE (type) == TYPE_CODE_PTR | |
741 | #endif | |
c5aa993b | 742 | ) |
c906108c SS |
743 | { |
744 | /* Value spread across multiple storage locations. */ | |
c5aa993b | 745 | |
c906108c SS |
746 | int local_regnum; |
747 | int mem_stor = 0, reg_stor = 0; | |
748 | int mem_tracking = 1; | |
749 | CORE_ADDR last_addr = 0; | |
750 | CORE_ADDR first_addr = 0; | |
751 | ||
752 | value_bytes = (char *) alloca (len + MAX_REGISTER_RAW_SIZE); | |
753 | ||
754 | /* Copy all of the data out, whereever it may be. */ | |
755 | ||
756 | #ifdef GDB_TARGET_IS_H8500 | |
757 | /* This piece of hideosity is required because the H8500 treats registers | |
758 | differently depending upon whether they are used as pointers or not. As a | |
759 | pointer, a register needs to have a page register tacked onto the front. | |
760 | An alternate way to do this would be to have gcc output different register | |
761 | numbers for the pointer & non-pointer form of the register. But, it | |
762 | doesn't, so we're stuck with this. */ | |
763 | ||
764 | if (TYPE_CODE (type) == TYPE_CODE_PTR | |
765 | && len > 2) | |
766 | { | |
767 | int page_regnum; | |
768 | ||
769 | switch (regnum) | |
770 | { | |
c5aa993b JM |
771 | case R0_REGNUM: |
772 | case R1_REGNUM: | |
773 | case R2_REGNUM: | |
774 | case R3_REGNUM: | |
c906108c SS |
775 | page_regnum = SEG_D_REGNUM; |
776 | break; | |
c5aa993b JM |
777 | case R4_REGNUM: |
778 | case R5_REGNUM: | |
c906108c SS |
779 | page_regnum = SEG_E_REGNUM; |
780 | break; | |
c5aa993b JM |
781 | case R6_REGNUM: |
782 | case R7_REGNUM: | |
c906108c SS |
783 | page_regnum = SEG_T_REGNUM; |
784 | break; | |
785 | } | |
786 | ||
787 | value_bytes[0] = 0; | |
788 | get_saved_register (value_bytes + 1, | |
789 | &optim, | |
790 | &addr, | |
791 | frame, | |
792 | page_regnum, | |
793 | &lval); | |
794 | ||
32178cab | 795 | if (register_cached (page_regnum) == -1) |
c906108c SS |
796 | return NULL; /* register value not available */ |
797 | ||
798 | if (lval == lval_register) | |
799 | reg_stor++; | |
800 | else | |
801 | mem_stor++; | |
802 | first_addr = addr; | |
803 | last_addr = addr; | |
804 | ||
805 | get_saved_register (value_bytes + 2, | |
806 | &optim, | |
807 | &addr, | |
808 | frame, | |
809 | regnum, | |
810 | &lval); | |
811 | ||
32178cab | 812 | if (register_cached (regnum) == -1) |
c906108c SS |
813 | return NULL; /* register value not available */ |
814 | ||
815 | if (lval == lval_register) | |
816 | reg_stor++; | |
817 | else | |
818 | { | |
819 | mem_stor++; | |
820 | mem_tracking = mem_tracking && (addr == last_addr); | |
821 | } | |
822 | last_addr = addr; | |
823 | } | |
824 | else | |
c5aa993b | 825 | #endif /* GDB_TARGET_IS_H8500 */ |
c906108c SS |
826 | for (local_regnum = regnum; |
827 | value_bytes_copied < len; | |
828 | (value_bytes_copied += REGISTER_RAW_SIZE (local_regnum), | |
829 | ++local_regnum)) | |
830 | { | |
831 | get_saved_register (value_bytes + value_bytes_copied, | |
832 | &optim, | |
833 | &addr, | |
834 | frame, | |
835 | local_regnum, | |
836 | &lval); | |
837 | ||
32178cab | 838 | if (register_cached (local_regnum) == -1) |
c5aa993b | 839 | return NULL; /* register value not available */ |
c906108c SS |
840 | |
841 | if (regnum == local_regnum) | |
842 | first_addr = addr; | |
843 | if (lval == lval_register) | |
844 | reg_stor++; | |
845 | else | |
846 | { | |
847 | mem_stor++; | |
c5aa993b | 848 | |
c906108c SS |
849 | mem_tracking = |
850 | (mem_tracking | |
851 | && (regnum == local_regnum | |
852 | || addr == last_addr)); | |
853 | } | |
854 | last_addr = addr; | |
855 | } | |
856 | ||
857 | if ((reg_stor && mem_stor) | |
858 | || (mem_stor && !mem_tracking)) | |
859 | /* Mixed storage; all of the hassle we just went through was | |
860 | for some good purpose. */ | |
861 | { | |
862 | VALUE_LVAL (v) = lval_reg_frame_relative; | |
863 | VALUE_FRAME (v) = FRAME_FP (frame); | |
864 | VALUE_FRAME_REGNUM (v) = regnum; | |
865 | } | |
866 | else if (mem_stor) | |
867 | { | |
868 | VALUE_LVAL (v) = lval_memory; | |
869 | VALUE_ADDRESS (v) = first_addr; | |
870 | } | |
871 | else if (reg_stor) | |
872 | { | |
873 | VALUE_LVAL (v) = lval_register; | |
874 | VALUE_ADDRESS (v) = first_addr; | |
875 | } | |
876 | else | |
96baa820 | 877 | internal_error ("value_from_register: Value not stored anywhere!"); |
c906108c SS |
878 | |
879 | VALUE_OPTIMIZED_OUT (v) = optim; | |
880 | ||
881 | /* Any structure stored in more than one register will always be | |
c5aa993b JM |
882 | an integral number of registers. Otherwise, you'd need to do |
883 | some fiddling with the last register copied here for little | |
884 | endian machines. */ | |
c906108c SS |
885 | |
886 | /* Copy into the contents section of the value. */ | |
887 | memcpy (VALUE_CONTENTS_RAW (v), value_bytes, len); | |
888 | ||
889 | /* Finally do any conversion necessary when extracting this | |
890 | type from more than one register. */ | |
891 | #ifdef REGISTER_CONVERT_TO_TYPE | |
c5aa993b | 892 | REGISTER_CONVERT_TO_TYPE (regnum, type, VALUE_CONTENTS_RAW (v)); |
c906108c SS |
893 | #endif |
894 | return v; | |
895 | } | |
896 | ||
897 | /* Data is completely contained within a single register. Locate the | |
898 | register's contents in a real register or in core; | |
899 | read the data in raw format. */ | |
900 | ||
901 | get_saved_register (raw_buffer, &optim, &addr, frame, regnum, &lval); | |
902 | ||
32178cab | 903 | if (register_cached (regnum) == -1) |
c5aa993b | 904 | return NULL; /* register value not available */ |
c906108c SS |
905 | |
906 | VALUE_OPTIMIZED_OUT (v) = optim; | |
907 | VALUE_LVAL (v) = lval; | |
908 | VALUE_ADDRESS (v) = addr; | |
909 | ||
910 | /* Convert raw data to virtual format if necessary. */ | |
c5aa993b | 911 | |
c906108c SS |
912 | if (REGISTER_CONVERTIBLE (regnum)) |
913 | { | |
914 | REGISTER_CONVERT_TO_VIRTUAL (regnum, type, | |
915 | raw_buffer, VALUE_CONTENTS_RAW (v)); | |
916 | } | |
917 | else | |
c906108c SS |
918 | { |
919 | /* Raw and virtual formats are the same for this register. */ | |
920 | ||
921 | if (TARGET_BYTE_ORDER == BIG_ENDIAN && len < REGISTER_RAW_SIZE (regnum)) | |
922 | { | |
c5aa993b | 923 | /* Big-endian, and we want less than full size. */ |
c906108c SS |
924 | VALUE_OFFSET (v) = REGISTER_RAW_SIZE (regnum) - len; |
925 | } | |
926 | ||
927 | memcpy (VALUE_CONTENTS_RAW (v), raw_buffer + VALUE_OFFSET (v), len); | |
928 | } | |
c5aa993b | 929 | |
da59e081 | 930 | if (GDB_TARGET_IS_D10V |
0f2c5ba5 | 931 | && TYPE_CODE (type) == TYPE_CODE_PTR) |
da59e081 | 932 | { |
da59e081 JM |
933 | unsigned long num; |
934 | unsigned short snum; | |
0f2c5ba5 MS |
935 | |
936 | snum = (unsigned short) | |
937 | extract_unsigned_integer (VALUE_CONTENTS_RAW (v), 2); | |
938 | ||
939 | if (TYPE_TARGET_TYPE (type) /* pointer to function */ | |
940 | && (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_FUNC)) | |
941 | num = D10V_MAKE_IADDR (snum); | |
942 | else /* pointer to data */ | |
943 | num = D10V_MAKE_DADDR (snum); | |
944 | ||
da59e081 JM |
945 | store_address (VALUE_CONTENTS_RAW (v), 4, num); |
946 | } | |
947 | ||
c906108c SS |
948 | return v; |
949 | } | |
950 | \f | |
951 | /* Given a struct symbol for a variable or function, | |
952 | and a stack frame id, | |
953 | return a (pointer to a) struct value containing the properly typed | |
954 | address. */ | |
955 | ||
956 | value_ptr | |
fba45db2 | 957 | locate_var_value (register struct symbol *var, struct frame_info *frame) |
c906108c SS |
958 | { |
959 | CORE_ADDR addr = 0; | |
960 | struct type *type = SYMBOL_TYPE (var); | |
961 | value_ptr lazy_value; | |
962 | ||
963 | /* Evaluate it first; if the result is a memory address, we're fine. | |
964 | Lazy evaluation pays off here. */ | |
965 | ||
966 | lazy_value = read_var_value (var, frame); | |
967 | if (lazy_value == 0) | |
968 | error ("Address of \"%s\" is unknown.", SYMBOL_SOURCE_NAME (var)); | |
969 | ||
970 | if (VALUE_LAZY (lazy_value) | |
971 | || TYPE_CODE (type) == TYPE_CODE_FUNC) | |
972 | { | |
973 | value_ptr val; | |
974 | ||
975 | addr = VALUE_ADDRESS (lazy_value); | |
4478b372 | 976 | val = value_from_pointer (lookup_pointer_type (type), addr); |
c906108c SS |
977 | VALUE_BFD_SECTION (val) = VALUE_BFD_SECTION (lazy_value); |
978 | return val; | |
979 | } | |
980 | ||
981 | /* Not a memory address; check what the problem was. */ | |
c5aa993b | 982 | switch (VALUE_LVAL (lazy_value)) |
c906108c SS |
983 | { |
984 | case lval_register: | |
985 | case lval_reg_frame_relative: | |
986 | error ("Address requested for identifier \"%s\" which is in a register.", | |
987 | SYMBOL_SOURCE_NAME (var)); | |
988 | break; | |
989 | ||
990 | default: | |
991 | error ("Can't take address of \"%s\" which isn't an lvalue.", | |
992 | SYMBOL_SOURCE_NAME (var)); | |
993 | break; | |
994 | } | |
c5aa993b | 995 | return 0; /* For lint -- never reached */ |
c906108c | 996 | } |