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 | |
391 | value_of_register (regnum) | |
392 | int regnum; | |
393 | { | |
394 | CORE_ADDR addr; | |
395 | int optim; | |
396 | register value_ptr reg_val; | |
397 | char raw_buffer[MAX_REGISTER_RAW_SIZE]; | |
398 | enum lval_type lval; | |
399 | ||
400 | get_saved_register (raw_buffer, &optim, &addr, | |
401 | selected_frame, regnum, &lval); | |
402 | ||
32178cab | 403 | if (register_cached (regnum) < 0) |
c5aa993b | 404 | return NULL; /* register value not available */ |
c906108c SS |
405 | |
406 | reg_val = allocate_value (REGISTER_VIRTUAL_TYPE (regnum)); | |
407 | ||
408 | /* Convert raw data to virtual format if necessary. */ | |
409 | ||
c906108c SS |
410 | if (REGISTER_CONVERTIBLE (regnum)) |
411 | { | |
412 | REGISTER_CONVERT_TO_VIRTUAL (regnum, REGISTER_VIRTUAL_TYPE (regnum), | |
413 | raw_buffer, VALUE_CONTENTS_RAW (reg_val)); | |
414 | } | |
392a587b JM |
415 | else if (REGISTER_RAW_SIZE (regnum) == REGISTER_VIRTUAL_SIZE (regnum)) |
416 | memcpy (VALUE_CONTENTS_RAW (reg_val), raw_buffer, | |
417 | REGISTER_RAW_SIZE (regnum)); | |
c906108c | 418 | else |
96baa820 JM |
419 | internal_error ("Register \"%s\" (%d) has conflicting raw (%d) and virtual (%d) size", |
420 | REGISTER_NAME (regnum), | |
421 | regnum, | |
422 | REGISTER_RAW_SIZE (regnum), | |
423 | REGISTER_VIRTUAL_SIZE (regnum)); | |
c906108c SS |
424 | VALUE_LVAL (reg_val) = lval; |
425 | VALUE_ADDRESS (reg_val) = addr; | |
426 | VALUE_REGNO (reg_val) = regnum; | |
427 | VALUE_OPTIMIZED_OUT (reg_val) = optim; | |
428 | return reg_val; | |
429 | } | |
4478b372 JB |
430 | |
431 | /* Given a pointer of type TYPE in target form in BUF, return the | |
432 | address it represents. */ | |
433 | CORE_ADDR | |
ac2e2ef7 | 434 | unsigned_pointer_to_address (struct type *type, void *buf) |
4478b372 JB |
435 | { |
436 | return extract_address (buf, TYPE_LENGTH (type)); | |
437 | } | |
438 | ||
ac2e2ef7 AC |
439 | CORE_ADDR |
440 | signed_pointer_to_address (struct type *type, void *buf) | |
441 | { | |
442 | return extract_signed_integer (buf, TYPE_LENGTH (type)); | |
443 | } | |
4478b372 JB |
444 | |
445 | /* Given an address, store it as a pointer of type TYPE in target | |
446 | format in BUF. */ | |
447 | void | |
ac2e2ef7 | 448 | unsigned_address_to_pointer (struct type *type, void *buf, CORE_ADDR addr) |
4478b372 JB |
449 | { |
450 | store_address (buf, TYPE_LENGTH (type), addr); | |
451 | } | |
452 | ||
ac2e2ef7 AC |
453 | void |
454 | address_to_signed_pointer (struct type *type, void *buf, CORE_ADDR addr) | |
455 | { | |
456 | store_signed_integer (buf, TYPE_LENGTH (type), addr); | |
457 | } | |
c906108c SS |
458 | \f |
459 | /* Will calling read_var_value or locate_var_value on SYM end | |
460 | up caring what frame it is being evaluated relative to? SYM must | |
461 | be non-NULL. */ | |
462 | int | |
463 | symbol_read_needs_frame (sym) | |
464 | struct symbol *sym; | |
465 | { | |
466 | switch (SYMBOL_CLASS (sym)) | |
467 | { | |
468 | /* All cases listed explicitly so that gcc -Wall will detect it if | |
c5aa993b | 469 | we failed to consider one. */ |
c906108c SS |
470 | case LOC_REGISTER: |
471 | case LOC_ARG: | |
472 | case LOC_REF_ARG: | |
473 | case LOC_REGPARM: | |
474 | case LOC_REGPARM_ADDR: | |
475 | case LOC_LOCAL: | |
476 | case LOC_LOCAL_ARG: | |
477 | case LOC_BASEREG: | |
478 | case LOC_BASEREG_ARG: | |
479 | case LOC_THREAD_LOCAL_STATIC: | |
480 | return 1; | |
481 | ||
482 | case LOC_UNDEF: | |
483 | case LOC_CONST: | |
484 | case LOC_STATIC: | |
485 | case LOC_INDIRECT: | |
486 | case LOC_TYPEDEF: | |
487 | ||
488 | case LOC_LABEL: | |
489 | /* Getting the address of a label can be done independently of the block, | |
c5aa993b JM |
490 | even if some *uses* of that address wouldn't work so well without |
491 | the right frame. */ | |
c906108c SS |
492 | |
493 | case LOC_BLOCK: | |
494 | case LOC_CONST_BYTES: | |
495 | case LOC_UNRESOLVED: | |
496 | case LOC_OPTIMIZED_OUT: | |
497 | return 0; | |
498 | } | |
499 | return 1; | |
500 | } | |
501 | ||
502 | /* Given a struct symbol for a variable, | |
503 | and a stack frame id, read the value of the variable | |
504 | and return a (pointer to a) struct value containing the value. | |
505 | If the variable cannot be found, return a zero pointer. | |
506 | If FRAME is NULL, use the selected_frame. */ | |
507 | ||
508 | value_ptr | |
509 | read_var_value (var, frame) | |
510 | register struct symbol *var; | |
511 | struct frame_info *frame; | |
512 | { | |
513 | register value_ptr v; | |
514 | struct type *type = SYMBOL_TYPE (var); | |
515 | CORE_ADDR addr; | |
516 | register int len; | |
517 | ||
518 | v = allocate_value (type); | |
519 | VALUE_LVAL (v) = lval_memory; /* The most likely possibility. */ | |
520 | VALUE_BFD_SECTION (v) = SYMBOL_BFD_SECTION (var); | |
521 | ||
522 | len = TYPE_LENGTH (type); | |
523 | ||
c5aa993b JM |
524 | if (frame == NULL) |
525 | frame = selected_frame; | |
c906108c SS |
526 | |
527 | switch (SYMBOL_CLASS (var)) | |
528 | { | |
529 | case LOC_CONST: | |
530 | /* Put the constant back in target format. */ | |
531 | store_signed_integer (VALUE_CONTENTS_RAW (v), len, | |
532 | (LONGEST) SYMBOL_VALUE (var)); | |
533 | VALUE_LVAL (v) = not_lval; | |
534 | return v; | |
535 | ||
536 | case LOC_LABEL: | |
537 | /* Put the constant back in target format. */ | |
538 | if (overlay_debugging) | |
4478b372 JB |
539 | { |
540 | CORE_ADDR addr | |
541 | = symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (var), | |
542 | SYMBOL_BFD_SECTION (var)); | |
543 | store_typed_address (VALUE_CONTENTS_RAW (v), type, addr); | |
544 | } | |
c906108c | 545 | else |
4478b372 JB |
546 | store_typed_address (VALUE_CONTENTS_RAW (v), type, |
547 | SYMBOL_VALUE_ADDRESS (var)); | |
c906108c SS |
548 | VALUE_LVAL (v) = not_lval; |
549 | return v; | |
550 | ||
551 | case LOC_CONST_BYTES: | |
552 | { | |
553 | char *bytes_addr; | |
554 | bytes_addr = SYMBOL_VALUE_BYTES (var); | |
555 | memcpy (VALUE_CONTENTS_RAW (v), bytes_addr, len); | |
556 | VALUE_LVAL (v) = not_lval; | |
557 | return v; | |
558 | } | |
559 | ||
560 | case LOC_STATIC: | |
561 | if (overlay_debugging) | |
562 | addr = symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (var), | |
563 | SYMBOL_BFD_SECTION (var)); | |
564 | else | |
565 | addr = SYMBOL_VALUE_ADDRESS (var); | |
566 | break; | |
567 | ||
568 | case LOC_INDIRECT: | |
569 | /* The import slot does not have a real address in it from the | |
570 | dynamic loader (dld.sl on HP-UX), if the target hasn't begun | |
c5aa993b | 571 | execution yet, so check for that. */ |
c906108c | 572 | if (!target_has_execution) |
c5aa993b | 573 | error ("\ |
c906108c SS |
574 | Attempt to access variable defined in different shared object or load module when\n\ |
575 | addresses have not been bound by the dynamic loader. Try again when executable is running."); | |
c5aa993b | 576 | |
c906108c SS |
577 | addr = SYMBOL_VALUE_ADDRESS (var); |
578 | addr = read_memory_unsigned_integer | |
579 | (addr, TARGET_PTR_BIT / TARGET_CHAR_BIT); | |
580 | break; | |
581 | ||
582 | case LOC_ARG: | |
583 | if (frame == NULL) | |
584 | return 0; | |
585 | addr = FRAME_ARGS_ADDRESS (frame); | |
586 | if (!addr) | |
587 | return 0; | |
588 | addr += SYMBOL_VALUE (var); | |
589 | break; | |
590 | ||
591 | case LOC_REF_ARG: | |
592 | if (frame == NULL) | |
593 | return 0; | |
594 | addr = FRAME_ARGS_ADDRESS (frame); | |
595 | if (!addr) | |
596 | return 0; | |
597 | addr += SYMBOL_VALUE (var); | |
598 | addr = read_memory_unsigned_integer | |
599 | (addr, TARGET_PTR_BIT / TARGET_CHAR_BIT); | |
600 | break; | |
601 | ||
602 | case LOC_LOCAL: | |
603 | case LOC_LOCAL_ARG: | |
604 | if (frame == NULL) | |
605 | return 0; | |
606 | addr = FRAME_LOCALS_ADDRESS (frame); | |
607 | addr += SYMBOL_VALUE (var); | |
608 | break; | |
609 | ||
610 | case LOC_BASEREG: | |
611 | case LOC_BASEREG_ARG: | |
612 | { | |
613 | char buf[MAX_REGISTER_RAW_SIZE]; | |
614 | get_saved_register (buf, NULL, NULL, frame, SYMBOL_BASEREG (var), | |
615 | NULL); | |
616 | addr = extract_address (buf, REGISTER_RAW_SIZE (SYMBOL_BASEREG (var))); | |
617 | addr += SYMBOL_VALUE (var); | |
618 | break; | |
619 | } | |
c5aa993b | 620 | |
c906108c SS |
621 | case LOC_THREAD_LOCAL_STATIC: |
622 | { | |
c5aa993b JM |
623 | char buf[MAX_REGISTER_RAW_SIZE]; |
624 | ||
625 | get_saved_register (buf, NULL, NULL, frame, SYMBOL_BASEREG (var), | |
c906108c | 626 | NULL); |
c5aa993b JM |
627 | addr = extract_address (buf, REGISTER_RAW_SIZE (SYMBOL_BASEREG (var))); |
628 | addr += SYMBOL_VALUE (var); | |
629 | break; | |
c906108c | 630 | } |
c5aa993b | 631 | |
c906108c SS |
632 | case LOC_TYPEDEF: |
633 | error ("Cannot look up value of a typedef"); | |
634 | break; | |
635 | ||
636 | case LOC_BLOCK: | |
637 | if (overlay_debugging) | |
c5aa993b | 638 | VALUE_ADDRESS (v) = symbol_overlayed_address |
c906108c SS |
639 | (BLOCK_START (SYMBOL_BLOCK_VALUE (var)), SYMBOL_BFD_SECTION (var)); |
640 | else | |
641 | VALUE_ADDRESS (v) = BLOCK_START (SYMBOL_BLOCK_VALUE (var)); | |
642 | return v; | |
643 | ||
644 | case LOC_REGISTER: | |
645 | case LOC_REGPARM: | |
646 | case LOC_REGPARM_ADDR: | |
647 | { | |
648 | struct block *b; | |
649 | int regno = SYMBOL_VALUE (var); | |
650 | value_ptr regval; | |
651 | ||
652 | if (frame == NULL) | |
653 | return 0; | |
654 | b = get_frame_block (frame); | |
655 | ||
656 | if (SYMBOL_CLASS (var) == LOC_REGPARM_ADDR) | |
657 | { | |
658 | regval = value_from_register (lookup_pointer_type (type), | |
c5aa993b | 659 | regno, |
c906108c SS |
660 | frame); |
661 | ||
662 | if (regval == NULL) | |
663 | error ("Value of register variable not available."); | |
664 | ||
c5aa993b | 665 | addr = value_as_pointer (regval); |
c906108c SS |
666 | VALUE_LVAL (v) = lval_memory; |
667 | } | |
668 | else | |
669 | { | |
670 | regval = value_from_register (type, regno, frame); | |
671 | ||
672 | if (regval == NULL) | |
673 | error ("Value of register variable not available."); | |
674 | return regval; | |
675 | } | |
676 | } | |
677 | break; | |
678 | ||
679 | case LOC_UNRESOLVED: | |
680 | { | |
681 | struct minimal_symbol *msym; | |
682 | ||
683 | msym = lookup_minimal_symbol (SYMBOL_NAME (var), NULL, NULL); | |
684 | if (msym == NULL) | |
685 | return 0; | |
686 | if (overlay_debugging) | |
687 | addr = symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (msym), | |
688 | SYMBOL_BFD_SECTION (msym)); | |
689 | else | |
690 | addr = SYMBOL_VALUE_ADDRESS (msym); | |
691 | } | |
692 | break; | |
693 | ||
694 | case LOC_OPTIMIZED_OUT: | |
695 | VALUE_LVAL (v) = not_lval; | |
696 | VALUE_OPTIMIZED_OUT (v) = 1; | |
697 | return v; | |
698 | ||
699 | default: | |
700 | error ("Cannot look up value of a botched symbol."); | |
701 | break; | |
702 | } | |
703 | ||
704 | VALUE_ADDRESS (v) = addr; | |
705 | VALUE_LAZY (v) = 1; | |
706 | return v; | |
707 | } | |
708 | ||
709 | /* Return a value of type TYPE, stored in register REGNUM, in frame | |
0f2c5ba5 | 710 | FRAME. |
c906108c SS |
711 | |
712 | NOTE: returns NULL if register value is not available. | |
713 | Caller will check return value or die! */ | |
714 | ||
715 | value_ptr | |
716 | value_from_register (type, regnum, frame) | |
717 | struct type *type; | |
718 | int regnum; | |
719 | struct frame_info *frame; | |
720 | { | |
c5aa993b | 721 | char raw_buffer[MAX_REGISTER_RAW_SIZE]; |
c906108c SS |
722 | CORE_ADDR addr; |
723 | int optim; | |
724 | value_ptr v = allocate_value (type); | |
725 | char *value_bytes = 0; | |
726 | int value_bytes_copied = 0; | |
727 | int num_storage_locs; | |
728 | enum lval_type lval; | |
729 | int len; | |
730 | ||
731 | CHECK_TYPEDEF (type); | |
732 | len = TYPE_LENGTH (type); | |
733 | ||
0f2c5ba5 MS |
734 | /* Pointers on D10V are really only 16 bits, |
735 | but we lie to gdb elsewhere... */ | |
da59e081 JM |
736 | if (GDB_TARGET_IS_D10V && TYPE_CODE (type) == TYPE_CODE_PTR) |
737 | len = 2; | |
738 | ||
c906108c SS |
739 | VALUE_REGNO (v) = regnum; |
740 | ||
741 | num_storage_locs = (len > REGISTER_VIRTUAL_SIZE (regnum) ? | |
742 | ((len - 1) / REGISTER_RAW_SIZE (regnum)) + 1 : | |
743 | 1); | |
744 | ||
745 | if (num_storage_locs > 1 | |
746 | #ifdef GDB_TARGET_IS_H8500 | |
747 | || TYPE_CODE (type) == TYPE_CODE_PTR | |
748 | #endif | |
c5aa993b | 749 | ) |
c906108c SS |
750 | { |
751 | /* Value spread across multiple storage locations. */ | |
c5aa993b | 752 | |
c906108c SS |
753 | int local_regnum; |
754 | int mem_stor = 0, reg_stor = 0; | |
755 | int mem_tracking = 1; | |
756 | CORE_ADDR last_addr = 0; | |
757 | CORE_ADDR first_addr = 0; | |
758 | ||
759 | value_bytes = (char *) alloca (len + MAX_REGISTER_RAW_SIZE); | |
760 | ||
761 | /* Copy all of the data out, whereever it may be. */ | |
762 | ||
763 | #ifdef GDB_TARGET_IS_H8500 | |
764 | /* This piece of hideosity is required because the H8500 treats registers | |
765 | differently depending upon whether they are used as pointers or not. As a | |
766 | pointer, a register needs to have a page register tacked onto the front. | |
767 | An alternate way to do this would be to have gcc output different register | |
768 | numbers for the pointer & non-pointer form of the register. But, it | |
769 | doesn't, so we're stuck with this. */ | |
770 | ||
771 | if (TYPE_CODE (type) == TYPE_CODE_PTR | |
772 | && len > 2) | |
773 | { | |
774 | int page_regnum; | |
775 | ||
776 | switch (regnum) | |
777 | { | |
c5aa993b JM |
778 | case R0_REGNUM: |
779 | case R1_REGNUM: | |
780 | case R2_REGNUM: | |
781 | case R3_REGNUM: | |
c906108c SS |
782 | page_regnum = SEG_D_REGNUM; |
783 | break; | |
c5aa993b JM |
784 | case R4_REGNUM: |
785 | case R5_REGNUM: | |
c906108c SS |
786 | page_regnum = SEG_E_REGNUM; |
787 | break; | |
c5aa993b JM |
788 | case R6_REGNUM: |
789 | case R7_REGNUM: | |
c906108c SS |
790 | page_regnum = SEG_T_REGNUM; |
791 | break; | |
792 | } | |
793 | ||
794 | value_bytes[0] = 0; | |
795 | get_saved_register (value_bytes + 1, | |
796 | &optim, | |
797 | &addr, | |
798 | frame, | |
799 | page_regnum, | |
800 | &lval); | |
801 | ||
32178cab | 802 | if (register_cached (page_regnum) == -1) |
c906108c SS |
803 | return NULL; /* register value not available */ |
804 | ||
805 | if (lval == lval_register) | |
806 | reg_stor++; | |
807 | else | |
808 | mem_stor++; | |
809 | first_addr = addr; | |
810 | last_addr = addr; | |
811 | ||
812 | get_saved_register (value_bytes + 2, | |
813 | &optim, | |
814 | &addr, | |
815 | frame, | |
816 | regnum, | |
817 | &lval); | |
818 | ||
32178cab | 819 | if (register_cached (regnum) == -1) |
c906108c SS |
820 | return NULL; /* register value not available */ |
821 | ||
822 | if (lval == lval_register) | |
823 | reg_stor++; | |
824 | else | |
825 | { | |
826 | mem_stor++; | |
827 | mem_tracking = mem_tracking && (addr == last_addr); | |
828 | } | |
829 | last_addr = addr; | |
830 | } | |
831 | else | |
c5aa993b | 832 | #endif /* GDB_TARGET_IS_H8500 */ |
c906108c SS |
833 | for (local_regnum = regnum; |
834 | value_bytes_copied < len; | |
835 | (value_bytes_copied += REGISTER_RAW_SIZE (local_regnum), | |
836 | ++local_regnum)) | |
837 | { | |
838 | get_saved_register (value_bytes + value_bytes_copied, | |
839 | &optim, | |
840 | &addr, | |
841 | frame, | |
842 | local_regnum, | |
843 | &lval); | |
844 | ||
32178cab | 845 | if (register_cached (local_regnum) == -1) |
c5aa993b | 846 | return NULL; /* register value not available */ |
c906108c SS |
847 | |
848 | if (regnum == local_regnum) | |
849 | first_addr = addr; | |
850 | if (lval == lval_register) | |
851 | reg_stor++; | |
852 | else | |
853 | { | |
854 | mem_stor++; | |
c5aa993b | 855 | |
c906108c SS |
856 | mem_tracking = |
857 | (mem_tracking | |
858 | && (regnum == local_regnum | |
859 | || addr == last_addr)); | |
860 | } | |
861 | last_addr = addr; | |
862 | } | |
863 | ||
864 | if ((reg_stor && mem_stor) | |
865 | || (mem_stor && !mem_tracking)) | |
866 | /* Mixed storage; all of the hassle we just went through was | |
867 | for some good purpose. */ | |
868 | { | |
869 | VALUE_LVAL (v) = lval_reg_frame_relative; | |
870 | VALUE_FRAME (v) = FRAME_FP (frame); | |
871 | VALUE_FRAME_REGNUM (v) = regnum; | |
872 | } | |
873 | else if (mem_stor) | |
874 | { | |
875 | VALUE_LVAL (v) = lval_memory; | |
876 | VALUE_ADDRESS (v) = first_addr; | |
877 | } | |
878 | else if (reg_stor) | |
879 | { | |
880 | VALUE_LVAL (v) = lval_register; | |
881 | VALUE_ADDRESS (v) = first_addr; | |
882 | } | |
883 | else | |
96baa820 | 884 | internal_error ("value_from_register: Value not stored anywhere!"); |
c906108c SS |
885 | |
886 | VALUE_OPTIMIZED_OUT (v) = optim; | |
887 | ||
888 | /* Any structure stored in more than one register will always be | |
c5aa993b JM |
889 | an integral number of registers. Otherwise, you'd need to do |
890 | some fiddling with the last register copied here for little | |
891 | endian machines. */ | |
c906108c SS |
892 | |
893 | /* Copy into the contents section of the value. */ | |
894 | memcpy (VALUE_CONTENTS_RAW (v), value_bytes, len); | |
895 | ||
896 | /* Finally do any conversion necessary when extracting this | |
897 | type from more than one register. */ | |
898 | #ifdef REGISTER_CONVERT_TO_TYPE | |
c5aa993b | 899 | REGISTER_CONVERT_TO_TYPE (regnum, type, VALUE_CONTENTS_RAW (v)); |
c906108c SS |
900 | #endif |
901 | return v; | |
902 | } | |
903 | ||
904 | /* Data is completely contained within a single register. Locate the | |
905 | register's contents in a real register or in core; | |
906 | read the data in raw format. */ | |
907 | ||
908 | get_saved_register (raw_buffer, &optim, &addr, frame, regnum, &lval); | |
909 | ||
32178cab | 910 | if (register_cached (regnum) == -1) |
c5aa993b | 911 | return NULL; /* register value not available */ |
c906108c SS |
912 | |
913 | VALUE_OPTIMIZED_OUT (v) = optim; | |
914 | VALUE_LVAL (v) = lval; | |
915 | VALUE_ADDRESS (v) = addr; | |
916 | ||
917 | /* Convert raw data to virtual format if necessary. */ | |
c5aa993b | 918 | |
c906108c SS |
919 | if (REGISTER_CONVERTIBLE (regnum)) |
920 | { | |
921 | REGISTER_CONVERT_TO_VIRTUAL (regnum, type, | |
922 | raw_buffer, VALUE_CONTENTS_RAW (v)); | |
923 | } | |
924 | else | |
c906108c SS |
925 | { |
926 | /* Raw and virtual formats are the same for this register. */ | |
927 | ||
928 | if (TARGET_BYTE_ORDER == BIG_ENDIAN && len < REGISTER_RAW_SIZE (regnum)) | |
929 | { | |
c5aa993b | 930 | /* Big-endian, and we want less than full size. */ |
c906108c SS |
931 | VALUE_OFFSET (v) = REGISTER_RAW_SIZE (regnum) - len; |
932 | } | |
933 | ||
934 | memcpy (VALUE_CONTENTS_RAW (v), raw_buffer + VALUE_OFFSET (v), len); | |
935 | } | |
c5aa993b | 936 | |
da59e081 | 937 | if (GDB_TARGET_IS_D10V |
0f2c5ba5 | 938 | && TYPE_CODE (type) == TYPE_CODE_PTR) |
da59e081 | 939 | { |
da59e081 JM |
940 | unsigned long num; |
941 | unsigned short snum; | |
0f2c5ba5 MS |
942 | |
943 | snum = (unsigned short) | |
944 | extract_unsigned_integer (VALUE_CONTENTS_RAW (v), 2); | |
945 | ||
946 | if (TYPE_TARGET_TYPE (type) /* pointer to function */ | |
947 | && (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_FUNC)) | |
948 | num = D10V_MAKE_IADDR (snum); | |
949 | else /* pointer to data */ | |
950 | num = D10V_MAKE_DADDR (snum); | |
951 | ||
da59e081 JM |
952 | store_address (VALUE_CONTENTS_RAW (v), 4, num); |
953 | } | |
954 | ||
c906108c SS |
955 | return v; |
956 | } | |
957 | \f | |
958 | /* Given a struct symbol for a variable or function, | |
959 | and a stack frame id, | |
960 | return a (pointer to a) struct value containing the properly typed | |
961 | address. */ | |
962 | ||
963 | value_ptr | |
964 | locate_var_value (var, frame) | |
965 | register struct symbol *var; | |
966 | struct frame_info *frame; | |
967 | { | |
968 | CORE_ADDR addr = 0; | |
969 | struct type *type = SYMBOL_TYPE (var); | |
970 | value_ptr lazy_value; | |
971 | ||
972 | /* Evaluate it first; if the result is a memory address, we're fine. | |
973 | Lazy evaluation pays off here. */ | |
974 | ||
975 | lazy_value = read_var_value (var, frame); | |
976 | if (lazy_value == 0) | |
977 | error ("Address of \"%s\" is unknown.", SYMBOL_SOURCE_NAME (var)); | |
978 | ||
979 | if (VALUE_LAZY (lazy_value) | |
980 | || TYPE_CODE (type) == TYPE_CODE_FUNC) | |
981 | { | |
982 | value_ptr val; | |
983 | ||
984 | addr = VALUE_ADDRESS (lazy_value); | |
4478b372 | 985 | val = value_from_pointer (lookup_pointer_type (type), addr); |
c906108c SS |
986 | VALUE_BFD_SECTION (val) = VALUE_BFD_SECTION (lazy_value); |
987 | return val; | |
988 | } | |
989 | ||
990 | /* Not a memory address; check what the problem was. */ | |
c5aa993b | 991 | switch (VALUE_LVAL (lazy_value)) |
c906108c SS |
992 | { |
993 | case lval_register: | |
994 | case lval_reg_frame_relative: | |
995 | error ("Address requested for identifier \"%s\" which is in a register.", | |
996 | SYMBOL_SOURCE_NAME (var)); | |
997 | break; | |
998 | ||
999 | default: | |
1000 | error ("Can't take address of \"%s\" which isn't an lvalue.", | |
1001 | SYMBOL_SOURCE_NAME (var)); | |
1002 | break; | |
1003 | } | |
c5aa993b | 1004 | return 0; /* For lint -- never reached */ |
c906108c | 1005 | } |