Commit | Line | Data |
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c906108c | 1 | /* Find a variable's value in memory, for GDB, the GNU debugger. |
b6ba6518 KB |
2 | Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, |
3 | 1996, 1997, 1998, 1999, 2000, 2001 | |
c906108c SS |
4 | Free Software Foundation, Inc. |
5 | ||
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
c906108c | 12 | |
c5aa993b JM |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
c906108c | 17 | |
c5aa993b JM |
18 | You should have received a copy of the GNU General Public License |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 59 Temple Place - Suite 330, | |
21 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
22 | |
23 | #include "defs.h" | |
24 | #include "symtab.h" | |
25 | #include "gdbtypes.h" | |
26 | #include "frame.h" | |
27 | #include "value.h" | |
28 | #include "gdbcore.h" | |
29 | #include "inferior.h" | |
30 | #include "target.h" | |
31 | #include "gdb_string.h" | |
32 | #include "floatformat.h" | |
c5aa993b | 33 | #include "symfile.h" /* for overlay functions */ |
4e052eda | 34 | #include "regcache.h" |
c906108c SS |
35 | |
36 | /* This is used to indicate that we don't know the format of the floating point | |
37 | number. Typically, this is useful for native ports, where the actual format | |
38 | is irrelevant, since no conversions will be taking place. */ | |
39 | ||
40 | const struct floatformat floatformat_unknown; | |
41 | ||
c906108c SS |
42 | /* Basic byte-swapping routines. GDB has needed these for a long time... |
43 | All extract a target-format integer at ADDR which is LEN bytes long. */ | |
44 | ||
45 | #if TARGET_CHAR_BIT != 8 || HOST_CHAR_BIT != 8 | |
46 | /* 8 bit characters are a pretty safe assumption these days, so we | |
47 | assume it throughout all these swapping routines. If we had to deal with | |
48 | 9 bit characters, we would need to make len be in bits and would have | |
49 | to re-write these routines... */ | |
c5aa993b | 50 | you lose |
c906108c SS |
51 | #endif |
52 | ||
a9ac8f51 AC |
53 | LONGEST |
54 | extract_signed_integer (void *addr, int len) | |
c906108c SS |
55 | { |
56 | LONGEST retval; | |
57 | unsigned char *p; | |
c5aa993b | 58 | unsigned char *startaddr = (unsigned char *) addr; |
c906108c SS |
59 | unsigned char *endaddr = startaddr + len; |
60 | ||
61 | if (len > (int) sizeof (LONGEST)) | |
62 | error ("\ | |
63 | That operation is not available on integers of more than %d bytes.", | |
64 | sizeof (LONGEST)); | |
65 | ||
66 | /* Start at the most significant end of the integer, and work towards | |
67 | the least significant. */ | |
68 | if (TARGET_BYTE_ORDER == BIG_ENDIAN) | |
69 | { | |
70 | p = startaddr; | |
71 | /* Do the sign extension once at the start. */ | |
c5aa993b | 72 | retval = ((LONGEST) * p ^ 0x80) - 0x80; |
c906108c SS |
73 | for (++p; p < endaddr; ++p) |
74 | retval = (retval << 8) | *p; | |
75 | } | |
76 | else | |
77 | { | |
78 | p = endaddr - 1; | |
79 | /* Do the sign extension once at the start. */ | |
c5aa993b | 80 | retval = ((LONGEST) * p ^ 0x80) - 0x80; |
c906108c SS |
81 | for (--p; p >= startaddr; --p) |
82 | retval = (retval << 8) | *p; | |
83 | } | |
84 | return retval; | |
85 | } | |
86 | ||
87 | ULONGEST | |
a9ac8f51 | 88 | extract_unsigned_integer (void *addr, int len) |
c906108c SS |
89 | { |
90 | ULONGEST retval; | |
91 | unsigned char *p; | |
c5aa993b | 92 | unsigned char *startaddr = (unsigned char *) addr; |
c906108c SS |
93 | unsigned char *endaddr = startaddr + len; |
94 | ||
95 | if (len > (int) sizeof (ULONGEST)) | |
96 | error ("\ | |
97 | That operation is not available on integers of more than %d bytes.", | |
98 | sizeof (ULONGEST)); | |
99 | ||
100 | /* Start at the most significant end of the integer, and work towards | |
101 | the least significant. */ | |
102 | retval = 0; | |
103 | if (TARGET_BYTE_ORDER == BIG_ENDIAN) | |
104 | { | |
105 | for (p = startaddr; p < endaddr; ++p) | |
106 | retval = (retval << 8) | *p; | |
107 | } | |
108 | else | |
109 | { | |
110 | for (p = endaddr - 1; p >= startaddr; --p) | |
111 | retval = (retval << 8) | *p; | |
112 | } | |
113 | return retval; | |
114 | } | |
115 | ||
116 | /* Sometimes a long long unsigned integer can be extracted as a | |
117 | LONGEST value. This is done so that we can print these values | |
118 | better. If this integer can be converted to a LONGEST, this | |
119 | function returns 1 and sets *PVAL. Otherwise it returns 0. */ | |
120 | ||
121 | int | |
a9ac8f51 | 122 | extract_long_unsigned_integer (void *addr, int orig_len, LONGEST *pval) |
c906108c SS |
123 | { |
124 | char *p, *first_addr; | |
125 | int len; | |
126 | ||
127 | len = orig_len; | |
128 | if (TARGET_BYTE_ORDER == BIG_ENDIAN) | |
129 | { | |
130 | for (p = (char *) addr; | |
131 | len > (int) sizeof (LONGEST) && p < (char *) addr + orig_len; | |
132 | p++) | |
133 | { | |
134 | if (*p == 0) | |
135 | len--; | |
136 | else | |
137 | break; | |
138 | } | |
139 | first_addr = p; | |
140 | } | |
141 | else | |
142 | { | |
143 | first_addr = (char *) addr; | |
144 | for (p = (char *) addr + orig_len - 1; | |
145 | len > (int) sizeof (LONGEST) && p >= (char *) addr; | |
146 | p--) | |
147 | { | |
148 | if (*p == 0) | |
149 | len--; | |
150 | else | |
151 | break; | |
152 | } | |
153 | } | |
154 | ||
155 | if (len <= (int) sizeof (LONGEST)) | |
156 | { | |
157 | *pval = (LONGEST) extract_unsigned_integer (first_addr, | |
158 | sizeof (LONGEST)); | |
159 | return 1; | |
160 | } | |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
4478b372 JB |
165 | |
166 | /* Treat the LEN bytes at ADDR as a target-format address, and return | |
167 | that address. ADDR is a buffer in the GDB process, not in the | |
168 | inferior. | |
169 | ||
170 | This function should only be used by target-specific code. It | |
171 | assumes that a pointer has the same representation as that thing's | |
172 | address represented as an integer. Some machines use word | |
173 | addresses, or similarly munged things, for certain types of | |
174 | pointers, so that assumption doesn't hold everywhere. | |
175 | ||
176 | Common code should use extract_typed_address instead, or something | |
177 | else based on POINTER_TO_ADDRESS. */ | |
178 | ||
c906108c | 179 | CORE_ADDR |
a9ac8f51 | 180 | extract_address (void *addr, int len) |
c906108c SS |
181 | { |
182 | /* Assume a CORE_ADDR can fit in a LONGEST (for now). Not sure | |
183 | whether we want this to be true eventually. */ | |
c5aa993b | 184 | return (CORE_ADDR) extract_unsigned_integer (addr, len); |
c906108c SS |
185 | } |
186 | ||
4478b372 | 187 | |
4478b372 JB |
188 | /* Treat the bytes at BUF as a pointer of type TYPE, and return the |
189 | address it represents. */ | |
190 | CORE_ADDR | |
191 | extract_typed_address (void *buf, struct type *type) | |
192 | { | |
193 | if (TYPE_CODE (type) != TYPE_CODE_PTR | |
194 | && TYPE_CODE (type) != TYPE_CODE_REF) | |
8e65ff28 AC |
195 | internal_error (__FILE__, __LINE__, |
196 | "extract_typed_address: " | |
4478b372 JB |
197 | "type is not a pointer or reference"); |
198 | ||
199 | return POINTER_TO_ADDRESS (type, buf); | |
200 | } | |
201 | ||
202 | ||
c906108c | 203 | void |
a9ac8f51 | 204 | store_signed_integer (void *addr, int len, LONGEST val) |
c906108c SS |
205 | { |
206 | unsigned char *p; | |
c5aa993b | 207 | unsigned char *startaddr = (unsigned char *) addr; |
c906108c SS |
208 | unsigned char *endaddr = startaddr + len; |
209 | ||
210 | /* Start at the least significant end of the integer, and work towards | |
211 | the most significant. */ | |
212 | if (TARGET_BYTE_ORDER == BIG_ENDIAN) | |
213 | { | |
214 | for (p = endaddr - 1; p >= startaddr; --p) | |
215 | { | |
216 | *p = val & 0xff; | |
217 | val >>= 8; | |
218 | } | |
219 | } | |
220 | else | |
221 | { | |
222 | for (p = startaddr; p < endaddr; ++p) | |
223 | { | |
224 | *p = val & 0xff; | |
225 | val >>= 8; | |
226 | } | |
227 | } | |
228 | } | |
229 | ||
230 | void | |
a9ac8f51 | 231 | store_unsigned_integer (void *addr, int len, ULONGEST val) |
c906108c SS |
232 | { |
233 | unsigned char *p; | |
c5aa993b | 234 | unsigned char *startaddr = (unsigned char *) addr; |
c906108c SS |
235 | unsigned char *endaddr = startaddr + len; |
236 | ||
237 | /* Start at the least significant end of the integer, and work towards | |
238 | the most significant. */ | |
239 | if (TARGET_BYTE_ORDER == BIG_ENDIAN) | |
240 | { | |
241 | for (p = endaddr - 1; p >= startaddr; --p) | |
242 | { | |
243 | *p = val & 0xff; | |
244 | val >>= 8; | |
245 | } | |
246 | } | |
247 | else | |
248 | { | |
249 | for (p = startaddr; p < endaddr; ++p) | |
250 | { | |
251 | *p = val & 0xff; | |
252 | val >>= 8; | |
253 | } | |
254 | } | |
255 | } | |
256 | ||
4478b372 JB |
257 | /* Store the address VAL as a LEN-byte value in target byte order at |
258 | ADDR. ADDR is a buffer in the GDB process, not in the inferior. | |
259 | ||
260 | This function should only be used by target-specific code. It | |
261 | assumes that a pointer has the same representation as that thing's | |
262 | address represented as an integer. Some machines use word | |
263 | addresses, or similarly munged things, for certain types of | |
264 | pointers, so that assumption doesn't hold everywhere. | |
265 | ||
266 | Common code should use store_typed_address instead, or something else | |
267 | based on ADDRESS_TO_POINTER. */ | |
c906108c | 268 | void |
a9ac8f51 | 269 | store_address (void *addr, int len, LONGEST val) |
c906108c | 270 | { |
c906108c SS |
271 | store_unsigned_integer (addr, len, val); |
272 | } | |
4478b372 JB |
273 | |
274 | ||
4478b372 JB |
275 | /* Store the address ADDR as a pointer of type TYPE at BUF, in target |
276 | form. */ | |
277 | void | |
278 | store_typed_address (void *buf, struct type *type, CORE_ADDR addr) | |
279 | { | |
280 | if (TYPE_CODE (type) != TYPE_CODE_PTR | |
281 | && TYPE_CODE (type) != TYPE_CODE_REF) | |
8e65ff28 AC |
282 | internal_error (__FILE__, __LINE__, |
283 | "store_typed_address: " | |
4478b372 JB |
284 | "type is not a pointer or reference"); |
285 | ||
286 | ADDRESS_TO_POINTER (type, buf, addr); | |
287 | } | |
288 | ||
289 | ||
290 | ||
c906108c SS |
291 | /* Return a `value' with the contents of register REGNUM |
292 | in its virtual format, with the type specified by | |
293 | REGISTER_VIRTUAL_TYPE. | |
294 | ||
295 | NOTE: returns NULL if register value is not available. | |
296 | Caller will check return value or die! */ | |
297 | ||
298 | value_ptr | |
fba45db2 | 299 | value_of_register (int regnum) |
c906108c SS |
300 | { |
301 | CORE_ADDR addr; | |
302 | int optim; | |
303 | register value_ptr reg_val; | |
e6cbd02a | 304 | char *raw_buffer = (char*) alloca (MAX_REGISTER_RAW_SIZE); |
c906108c SS |
305 | enum lval_type lval; |
306 | ||
307 | get_saved_register (raw_buffer, &optim, &addr, | |
308 | selected_frame, regnum, &lval); | |
309 | ||
32178cab | 310 | if (register_cached (regnum) < 0) |
c5aa993b | 311 | return NULL; /* register value not available */ |
c906108c SS |
312 | |
313 | reg_val = allocate_value (REGISTER_VIRTUAL_TYPE (regnum)); | |
314 | ||
315 | /* Convert raw data to virtual format if necessary. */ | |
316 | ||
c906108c SS |
317 | if (REGISTER_CONVERTIBLE (regnum)) |
318 | { | |
319 | REGISTER_CONVERT_TO_VIRTUAL (regnum, REGISTER_VIRTUAL_TYPE (regnum), | |
320 | raw_buffer, VALUE_CONTENTS_RAW (reg_val)); | |
321 | } | |
392a587b JM |
322 | else if (REGISTER_RAW_SIZE (regnum) == REGISTER_VIRTUAL_SIZE (regnum)) |
323 | memcpy (VALUE_CONTENTS_RAW (reg_val), raw_buffer, | |
324 | REGISTER_RAW_SIZE (regnum)); | |
c906108c | 325 | else |
8e65ff28 AC |
326 | internal_error (__FILE__, __LINE__, |
327 | "Register \"%s\" (%d) has conflicting raw (%d) and virtual (%d) size", | |
96baa820 JM |
328 | REGISTER_NAME (regnum), |
329 | regnum, | |
330 | REGISTER_RAW_SIZE (regnum), | |
331 | REGISTER_VIRTUAL_SIZE (regnum)); | |
c906108c SS |
332 | VALUE_LVAL (reg_val) = lval; |
333 | VALUE_ADDRESS (reg_val) = addr; | |
334 | VALUE_REGNO (reg_val) = regnum; | |
335 | VALUE_OPTIMIZED_OUT (reg_val) = optim; | |
336 | return reg_val; | |
337 | } | |
4478b372 JB |
338 | |
339 | /* Given a pointer of type TYPE in target form in BUF, return the | |
340 | address it represents. */ | |
341 | CORE_ADDR | |
ac2e2ef7 | 342 | unsigned_pointer_to_address (struct type *type, void *buf) |
4478b372 JB |
343 | { |
344 | return extract_address (buf, TYPE_LENGTH (type)); | |
345 | } | |
346 | ||
ac2e2ef7 AC |
347 | CORE_ADDR |
348 | signed_pointer_to_address (struct type *type, void *buf) | |
349 | { | |
350 | return extract_signed_integer (buf, TYPE_LENGTH (type)); | |
351 | } | |
4478b372 JB |
352 | |
353 | /* Given an address, store it as a pointer of type TYPE in target | |
354 | format in BUF. */ | |
355 | void | |
ac2e2ef7 | 356 | unsigned_address_to_pointer (struct type *type, void *buf, CORE_ADDR addr) |
4478b372 JB |
357 | { |
358 | store_address (buf, TYPE_LENGTH (type), addr); | |
359 | } | |
360 | ||
ac2e2ef7 AC |
361 | void |
362 | address_to_signed_pointer (struct type *type, void *buf, CORE_ADDR addr) | |
363 | { | |
364 | store_signed_integer (buf, TYPE_LENGTH (type), addr); | |
365 | } | |
c906108c SS |
366 | \f |
367 | /* Will calling read_var_value or locate_var_value on SYM end | |
368 | up caring what frame it is being evaluated relative to? SYM must | |
369 | be non-NULL. */ | |
370 | int | |
fba45db2 | 371 | symbol_read_needs_frame (struct symbol *sym) |
c906108c SS |
372 | { |
373 | switch (SYMBOL_CLASS (sym)) | |
374 | { | |
375 | /* All cases listed explicitly so that gcc -Wall will detect it if | |
c5aa993b | 376 | we failed to consider one. */ |
c906108c SS |
377 | case LOC_REGISTER: |
378 | case LOC_ARG: | |
379 | case LOC_REF_ARG: | |
380 | case LOC_REGPARM: | |
381 | case LOC_REGPARM_ADDR: | |
382 | case LOC_LOCAL: | |
383 | case LOC_LOCAL_ARG: | |
384 | case LOC_BASEREG: | |
385 | case LOC_BASEREG_ARG: | |
386 | case LOC_THREAD_LOCAL_STATIC: | |
387 | return 1; | |
388 | ||
389 | case LOC_UNDEF: | |
390 | case LOC_CONST: | |
391 | case LOC_STATIC: | |
392 | case LOC_INDIRECT: | |
393 | case LOC_TYPEDEF: | |
394 | ||
395 | case LOC_LABEL: | |
396 | /* Getting the address of a label can be done independently of the block, | |
c5aa993b JM |
397 | even if some *uses* of that address wouldn't work so well without |
398 | the right frame. */ | |
c906108c SS |
399 | |
400 | case LOC_BLOCK: | |
401 | case LOC_CONST_BYTES: | |
402 | case LOC_UNRESOLVED: | |
403 | case LOC_OPTIMIZED_OUT: | |
404 | return 0; | |
405 | } | |
406 | return 1; | |
407 | } | |
408 | ||
409 | /* Given a struct symbol for a variable, | |
410 | and a stack frame id, read the value of the variable | |
411 | and return a (pointer to a) struct value containing the value. | |
412 | If the variable cannot be found, return a zero pointer. | |
413 | If FRAME is NULL, use the selected_frame. */ | |
414 | ||
415 | value_ptr | |
fba45db2 | 416 | read_var_value (register struct symbol *var, struct frame_info *frame) |
c906108c SS |
417 | { |
418 | register value_ptr v; | |
419 | struct type *type = SYMBOL_TYPE (var); | |
420 | CORE_ADDR addr; | |
421 | register int len; | |
422 | ||
423 | v = allocate_value (type); | |
424 | VALUE_LVAL (v) = lval_memory; /* The most likely possibility. */ | |
425 | VALUE_BFD_SECTION (v) = SYMBOL_BFD_SECTION (var); | |
426 | ||
427 | len = TYPE_LENGTH (type); | |
428 | ||
c5aa993b JM |
429 | if (frame == NULL) |
430 | frame = selected_frame; | |
c906108c SS |
431 | |
432 | switch (SYMBOL_CLASS (var)) | |
433 | { | |
434 | case LOC_CONST: | |
435 | /* Put the constant back in target format. */ | |
436 | store_signed_integer (VALUE_CONTENTS_RAW (v), len, | |
437 | (LONGEST) SYMBOL_VALUE (var)); | |
438 | VALUE_LVAL (v) = not_lval; | |
439 | return v; | |
440 | ||
441 | case LOC_LABEL: | |
442 | /* Put the constant back in target format. */ | |
443 | if (overlay_debugging) | |
4478b372 JB |
444 | { |
445 | CORE_ADDR addr | |
446 | = symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (var), | |
447 | SYMBOL_BFD_SECTION (var)); | |
448 | store_typed_address (VALUE_CONTENTS_RAW (v), type, addr); | |
449 | } | |
c906108c | 450 | else |
4478b372 JB |
451 | store_typed_address (VALUE_CONTENTS_RAW (v), type, |
452 | SYMBOL_VALUE_ADDRESS (var)); | |
c906108c SS |
453 | VALUE_LVAL (v) = not_lval; |
454 | return v; | |
455 | ||
456 | case LOC_CONST_BYTES: | |
457 | { | |
458 | char *bytes_addr; | |
459 | bytes_addr = SYMBOL_VALUE_BYTES (var); | |
460 | memcpy (VALUE_CONTENTS_RAW (v), bytes_addr, len); | |
461 | VALUE_LVAL (v) = not_lval; | |
462 | return v; | |
463 | } | |
464 | ||
465 | case LOC_STATIC: | |
466 | if (overlay_debugging) | |
467 | addr = symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (var), | |
468 | SYMBOL_BFD_SECTION (var)); | |
469 | else | |
470 | addr = SYMBOL_VALUE_ADDRESS (var); | |
471 | break; | |
472 | ||
473 | case LOC_INDIRECT: | |
474 | /* The import slot does not have a real address in it from the | |
475 | dynamic loader (dld.sl on HP-UX), if the target hasn't begun | |
c5aa993b | 476 | execution yet, so check for that. */ |
c906108c | 477 | if (!target_has_execution) |
c5aa993b | 478 | error ("\ |
c906108c SS |
479 | Attempt to access variable defined in different shared object or load module when\n\ |
480 | addresses have not been bound by the dynamic loader. Try again when executable is running."); | |
c5aa993b | 481 | |
c906108c SS |
482 | addr = SYMBOL_VALUE_ADDRESS (var); |
483 | addr = read_memory_unsigned_integer | |
484 | (addr, TARGET_PTR_BIT / TARGET_CHAR_BIT); | |
485 | break; | |
486 | ||
487 | case LOC_ARG: | |
488 | if (frame == NULL) | |
489 | return 0; | |
490 | addr = FRAME_ARGS_ADDRESS (frame); | |
491 | if (!addr) | |
492 | return 0; | |
493 | addr += SYMBOL_VALUE (var); | |
494 | break; | |
495 | ||
496 | case LOC_REF_ARG: | |
497 | if (frame == NULL) | |
498 | return 0; | |
499 | addr = FRAME_ARGS_ADDRESS (frame); | |
500 | if (!addr) | |
501 | return 0; | |
502 | addr += SYMBOL_VALUE (var); | |
503 | addr = read_memory_unsigned_integer | |
504 | (addr, TARGET_PTR_BIT / TARGET_CHAR_BIT); | |
505 | break; | |
506 | ||
507 | case LOC_LOCAL: | |
508 | case LOC_LOCAL_ARG: | |
509 | if (frame == NULL) | |
510 | return 0; | |
511 | addr = FRAME_LOCALS_ADDRESS (frame); | |
512 | addr += SYMBOL_VALUE (var); | |
513 | break; | |
514 | ||
515 | case LOC_BASEREG: | |
516 | case LOC_BASEREG_ARG: | |
c906108c SS |
517 | case LOC_THREAD_LOCAL_STATIC: |
518 | { | |
9ed10b08 | 519 | value_ptr regval; |
c5aa993b | 520 | |
9ed10b08 ND |
521 | regval = value_from_register (lookup_pointer_type (type), |
522 | SYMBOL_BASEREG (var), frame); | |
523 | if (regval == NULL) | |
524 | error ("Value of base register not available."); | |
525 | addr = value_as_pointer (regval); | |
c5aa993b JM |
526 | addr += SYMBOL_VALUE (var); |
527 | break; | |
c906108c | 528 | } |
c5aa993b | 529 | |
c906108c SS |
530 | case LOC_TYPEDEF: |
531 | error ("Cannot look up value of a typedef"); | |
532 | break; | |
533 | ||
534 | case LOC_BLOCK: | |
535 | if (overlay_debugging) | |
c5aa993b | 536 | VALUE_ADDRESS (v) = symbol_overlayed_address |
c906108c SS |
537 | (BLOCK_START (SYMBOL_BLOCK_VALUE (var)), SYMBOL_BFD_SECTION (var)); |
538 | else | |
539 | VALUE_ADDRESS (v) = BLOCK_START (SYMBOL_BLOCK_VALUE (var)); | |
540 | return v; | |
541 | ||
542 | case LOC_REGISTER: | |
543 | case LOC_REGPARM: | |
544 | case LOC_REGPARM_ADDR: | |
545 | { | |
546 | struct block *b; | |
547 | int regno = SYMBOL_VALUE (var); | |
548 | value_ptr regval; | |
549 | ||
550 | if (frame == NULL) | |
551 | return 0; | |
552 | b = get_frame_block (frame); | |
553 | ||
554 | if (SYMBOL_CLASS (var) == LOC_REGPARM_ADDR) | |
555 | { | |
556 | regval = value_from_register (lookup_pointer_type (type), | |
c5aa993b | 557 | regno, |
c906108c SS |
558 | frame); |
559 | ||
560 | if (regval == NULL) | |
561 | error ("Value of register variable not available."); | |
562 | ||
c5aa993b | 563 | addr = value_as_pointer (regval); |
c906108c SS |
564 | VALUE_LVAL (v) = lval_memory; |
565 | } | |
566 | else | |
567 | { | |
568 | regval = value_from_register (type, regno, frame); | |
569 | ||
570 | if (regval == NULL) | |
571 | error ("Value of register variable not available."); | |
572 | return regval; | |
573 | } | |
574 | } | |
575 | break; | |
576 | ||
577 | case LOC_UNRESOLVED: | |
578 | { | |
579 | struct minimal_symbol *msym; | |
580 | ||
581 | msym = lookup_minimal_symbol (SYMBOL_NAME (var), NULL, NULL); | |
582 | if (msym == NULL) | |
583 | return 0; | |
584 | if (overlay_debugging) | |
585 | addr = symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (msym), | |
586 | SYMBOL_BFD_SECTION (msym)); | |
587 | else | |
588 | addr = SYMBOL_VALUE_ADDRESS (msym); | |
589 | } | |
590 | break; | |
591 | ||
592 | case LOC_OPTIMIZED_OUT: | |
593 | VALUE_LVAL (v) = not_lval; | |
594 | VALUE_OPTIMIZED_OUT (v) = 1; | |
595 | return v; | |
596 | ||
597 | default: | |
598 | error ("Cannot look up value of a botched symbol."); | |
599 | break; | |
600 | } | |
601 | ||
602 | VALUE_ADDRESS (v) = addr; | |
603 | VALUE_LAZY (v) = 1; | |
604 | return v; | |
605 | } | |
606 | ||
607 | /* Return a value of type TYPE, stored in register REGNUM, in frame | |
0f2c5ba5 | 608 | FRAME. |
c906108c SS |
609 | |
610 | NOTE: returns NULL if register value is not available. | |
611 | Caller will check return value or die! */ | |
612 | ||
613 | value_ptr | |
fba45db2 | 614 | value_from_register (struct type *type, int regnum, struct frame_info *frame) |
c906108c | 615 | { |
e6cbd02a | 616 | char *raw_buffer = (char*) alloca (MAX_REGISTER_RAW_SIZE); |
c906108c SS |
617 | CORE_ADDR addr; |
618 | int optim; | |
619 | value_ptr v = allocate_value (type); | |
620 | char *value_bytes = 0; | |
621 | int value_bytes_copied = 0; | |
622 | int num_storage_locs; | |
623 | enum lval_type lval; | |
624 | int len; | |
625 | ||
626 | CHECK_TYPEDEF (type); | |
627 | len = TYPE_LENGTH (type); | |
628 | ||
629 | VALUE_REGNO (v) = regnum; | |
630 | ||
631 | num_storage_locs = (len > REGISTER_VIRTUAL_SIZE (regnum) ? | |
632 | ((len - 1) / REGISTER_RAW_SIZE (regnum)) + 1 : | |
633 | 1); | |
634 | ||
635 | if (num_storage_locs > 1 | |
636 | #ifdef GDB_TARGET_IS_H8500 | |
637 | || TYPE_CODE (type) == TYPE_CODE_PTR | |
638 | #endif | |
c5aa993b | 639 | ) |
c906108c SS |
640 | { |
641 | /* Value spread across multiple storage locations. */ | |
c5aa993b | 642 | |
c906108c SS |
643 | int local_regnum; |
644 | int mem_stor = 0, reg_stor = 0; | |
645 | int mem_tracking = 1; | |
646 | CORE_ADDR last_addr = 0; | |
647 | CORE_ADDR first_addr = 0; | |
648 | ||
649 | value_bytes = (char *) alloca (len + MAX_REGISTER_RAW_SIZE); | |
650 | ||
651 | /* Copy all of the data out, whereever it may be. */ | |
652 | ||
653 | #ifdef GDB_TARGET_IS_H8500 | |
654 | /* This piece of hideosity is required because the H8500 treats registers | |
655 | differently depending upon whether they are used as pointers or not. As a | |
656 | pointer, a register needs to have a page register tacked onto the front. | |
657 | An alternate way to do this would be to have gcc output different register | |
658 | numbers for the pointer & non-pointer form of the register. But, it | |
659 | doesn't, so we're stuck with this. */ | |
660 | ||
661 | if (TYPE_CODE (type) == TYPE_CODE_PTR | |
662 | && len > 2) | |
663 | { | |
664 | int page_regnum; | |
665 | ||
666 | switch (regnum) | |
667 | { | |
c5aa993b JM |
668 | case R0_REGNUM: |
669 | case R1_REGNUM: | |
670 | case R2_REGNUM: | |
671 | case R3_REGNUM: | |
c906108c SS |
672 | page_regnum = SEG_D_REGNUM; |
673 | break; | |
c5aa993b JM |
674 | case R4_REGNUM: |
675 | case R5_REGNUM: | |
c906108c SS |
676 | page_regnum = SEG_E_REGNUM; |
677 | break; | |
c5aa993b JM |
678 | case R6_REGNUM: |
679 | case R7_REGNUM: | |
c906108c SS |
680 | page_regnum = SEG_T_REGNUM; |
681 | break; | |
682 | } | |
683 | ||
684 | value_bytes[0] = 0; | |
685 | get_saved_register (value_bytes + 1, | |
686 | &optim, | |
687 | &addr, | |
688 | frame, | |
689 | page_regnum, | |
690 | &lval); | |
691 | ||
32178cab | 692 | if (register_cached (page_regnum) == -1) |
c906108c SS |
693 | return NULL; /* register value not available */ |
694 | ||
695 | if (lval == lval_register) | |
696 | reg_stor++; | |
697 | else | |
698 | mem_stor++; | |
699 | first_addr = addr; | |
700 | last_addr = addr; | |
701 | ||
702 | get_saved_register (value_bytes + 2, | |
703 | &optim, | |
704 | &addr, | |
705 | frame, | |
706 | regnum, | |
707 | &lval); | |
708 | ||
32178cab | 709 | if (register_cached (regnum) == -1) |
c906108c SS |
710 | return NULL; /* register value not available */ |
711 | ||
712 | if (lval == lval_register) | |
713 | reg_stor++; | |
714 | else | |
715 | { | |
716 | mem_stor++; | |
717 | mem_tracking = mem_tracking && (addr == last_addr); | |
718 | } | |
719 | last_addr = addr; | |
720 | } | |
721 | else | |
c5aa993b | 722 | #endif /* GDB_TARGET_IS_H8500 */ |
c906108c SS |
723 | for (local_regnum = regnum; |
724 | value_bytes_copied < len; | |
725 | (value_bytes_copied += REGISTER_RAW_SIZE (local_regnum), | |
726 | ++local_regnum)) | |
727 | { | |
728 | get_saved_register (value_bytes + value_bytes_copied, | |
729 | &optim, | |
730 | &addr, | |
731 | frame, | |
732 | local_regnum, | |
733 | &lval); | |
734 | ||
32178cab | 735 | if (register_cached (local_regnum) == -1) |
c5aa993b | 736 | return NULL; /* register value not available */ |
c906108c SS |
737 | |
738 | if (regnum == local_regnum) | |
739 | first_addr = addr; | |
740 | if (lval == lval_register) | |
741 | reg_stor++; | |
742 | else | |
743 | { | |
744 | mem_stor++; | |
c5aa993b | 745 | |
c906108c SS |
746 | mem_tracking = |
747 | (mem_tracking | |
748 | && (regnum == local_regnum | |
749 | || addr == last_addr)); | |
750 | } | |
751 | last_addr = addr; | |
752 | } | |
753 | ||
754 | if ((reg_stor && mem_stor) | |
755 | || (mem_stor && !mem_tracking)) | |
756 | /* Mixed storage; all of the hassle we just went through was | |
757 | for some good purpose. */ | |
758 | { | |
759 | VALUE_LVAL (v) = lval_reg_frame_relative; | |
760 | VALUE_FRAME (v) = FRAME_FP (frame); | |
761 | VALUE_FRAME_REGNUM (v) = regnum; | |
762 | } | |
763 | else if (mem_stor) | |
764 | { | |
765 | VALUE_LVAL (v) = lval_memory; | |
766 | VALUE_ADDRESS (v) = first_addr; | |
767 | } | |
768 | else if (reg_stor) | |
769 | { | |
770 | VALUE_LVAL (v) = lval_register; | |
771 | VALUE_ADDRESS (v) = first_addr; | |
772 | } | |
773 | else | |
8e65ff28 AC |
774 | internal_error (__FILE__, __LINE__, |
775 | "value_from_register: Value not stored anywhere!"); | |
c906108c SS |
776 | |
777 | VALUE_OPTIMIZED_OUT (v) = optim; | |
778 | ||
779 | /* Any structure stored in more than one register will always be | |
c5aa993b JM |
780 | an integral number of registers. Otherwise, you'd need to do |
781 | some fiddling with the last register copied here for little | |
782 | endian machines. */ | |
c906108c SS |
783 | |
784 | /* Copy into the contents section of the value. */ | |
785 | memcpy (VALUE_CONTENTS_RAW (v), value_bytes, len); | |
786 | ||
787 | /* Finally do any conversion necessary when extracting this | |
788 | type from more than one register. */ | |
789 | #ifdef REGISTER_CONVERT_TO_TYPE | |
c5aa993b | 790 | REGISTER_CONVERT_TO_TYPE (regnum, type, VALUE_CONTENTS_RAW (v)); |
c906108c SS |
791 | #endif |
792 | return v; | |
793 | } | |
794 | ||
795 | /* Data is completely contained within a single register. Locate the | |
796 | register's contents in a real register or in core; | |
797 | read the data in raw format. */ | |
798 | ||
799 | get_saved_register (raw_buffer, &optim, &addr, frame, regnum, &lval); | |
800 | ||
32178cab | 801 | if (register_cached (regnum) == -1) |
c5aa993b | 802 | return NULL; /* register value not available */ |
c906108c SS |
803 | |
804 | VALUE_OPTIMIZED_OUT (v) = optim; | |
805 | VALUE_LVAL (v) = lval; | |
806 | VALUE_ADDRESS (v) = addr; | |
807 | ||
808 | /* Convert raw data to virtual format if necessary. */ | |
c5aa993b | 809 | |
c906108c SS |
810 | if (REGISTER_CONVERTIBLE (regnum)) |
811 | { | |
812 | REGISTER_CONVERT_TO_VIRTUAL (regnum, type, | |
813 | raw_buffer, VALUE_CONTENTS_RAW (v)); | |
814 | } | |
815 | else | |
c906108c SS |
816 | { |
817 | /* Raw and virtual formats are the same for this register. */ | |
818 | ||
819 | if (TARGET_BYTE_ORDER == BIG_ENDIAN && len < REGISTER_RAW_SIZE (regnum)) | |
820 | { | |
c5aa993b | 821 | /* Big-endian, and we want less than full size. */ |
c906108c SS |
822 | VALUE_OFFSET (v) = REGISTER_RAW_SIZE (regnum) - len; |
823 | } | |
824 | ||
825 | memcpy (VALUE_CONTENTS_RAW (v), raw_buffer + VALUE_OFFSET (v), len); | |
826 | } | |
c5aa993b | 827 | |
c906108c SS |
828 | return v; |
829 | } | |
830 | \f | |
831 | /* Given a struct symbol for a variable or function, | |
832 | and a stack frame id, | |
833 | return a (pointer to a) struct value containing the properly typed | |
834 | address. */ | |
835 | ||
836 | value_ptr | |
fba45db2 | 837 | locate_var_value (register struct symbol *var, struct frame_info *frame) |
c906108c SS |
838 | { |
839 | CORE_ADDR addr = 0; | |
840 | struct type *type = SYMBOL_TYPE (var); | |
841 | value_ptr lazy_value; | |
842 | ||
843 | /* Evaluate it first; if the result is a memory address, we're fine. | |
844 | Lazy evaluation pays off here. */ | |
845 | ||
846 | lazy_value = read_var_value (var, frame); | |
847 | if (lazy_value == 0) | |
848 | error ("Address of \"%s\" is unknown.", SYMBOL_SOURCE_NAME (var)); | |
849 | ||
850 | if (VALUE_LAZY (lazy_value) | |
851 | || TYPE_CODE (type) == TYPE_CODE_FUNC) | |
852 | { | |
853 | value_ptr val; | |
854 | ||
855 | addr = VALUE_ADDRESS (lazy_value); | |
4478b372 | 856 | val = value_from_pointer (lookup_pointer_type (type), addr); |
c906108c SS |
857 | VALUE_BFD_SECTION (val) = VALUE_BFD_SECTION (lazy_value); |
858 | return val; | |
859 | } | |
860 | ||
861 | /* Not a memory address; check what the problem was. */ | |
c5aa993b | 862 | switch (VALUE_LVAL (lazy_value)) |
c906108c SS |
863 | { |
864 | case lval_register: | |
865 | case lval_reg_frame_relative: | |
866 | error ("Address requested for identifier \"%s\" which is in a register.", | |
867 | SYMBOL_SOURCE_NAME (var)); | |
868 | break; | |
869 | ||
870 | default: | |
871 | error ("Can't take address of \"%s\" which isn't an lvalue.", | |
872 | SYMBOL_SOURCE_NAME (var)); | |
873 | break; | |
874 | } | |
c5aa993b | 875 | return 0; /* For lint -- never reached */ |
c906108c | 876 | } |