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9f14eebc | 1 | /* Agent expression code for remote server. |
ecd75fc8 | 2 | Copyright (C) 2009-2014 Free Software Foundation, Inc. |
9f14eebc LM |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include "server.h" | |
20 | #include "ax.h" | |
d3ce09f5 | 21 | #include "format.h" |
c144c7a0 | 22 | #include "tracepoint.h" |
9c3d6531 | 23 | #include "rsp-low.h" |
9f14eebc | 24 | |
18c1b81a | 25 | static void ax_vdebug (const char *, ...) ATTRIBUTE_PRINTF (1, 2); |
9f14eebc LM |
26 | |
27 | #ifdef IN_PROCESS_AGENT | |
28 | int debug_agent = 0; | |
29 | #endif | |
30 | ||
31 | static void | |
32 | ax_vdebug (const char *fmt, ...) | |
33 | { | |
34 | char buf[1024]; | |
35 | va_list ap; | |
36 | ||
37 | va_start (ap, fmt); | |
38 | vsprintf (buf, fmt, ap); | |
39 | fprintf (stderr, PROG "/ax: %s\n", buf); | |
40 | va_end (ap); | |
41 | } | |
42 | ||
43 | #define ax_debug_1(level, fmt, args...) \ | |
44 | do { \ | |
45 | if (level <= debug_threads) \ | |
46 | ax_vdebug ((fmt), ##args); \ | |
47 | } while (0) | |
48 | ||
49 | #define ax_debug(FMT, args...) \ | |
50 | ax_debug_1 (1, FMT, ##args) | |
51 | ||
52 | /* This enum must exactly match what is documented in | |
53 | gdb/doc/agentexpr.texi, including all the numerical values. */ | |
54 | ||
55 | enum gdb_agent_op | |
56 | { | |
57 | #define DEFOP(NAME, SIZE, DATA_SIZE, CONSUMED, PRODUCED, VALUE) \ | |
58 | gdb_agent_op_ ## NAME = VALUE, | |
59 | #include "ax.def" | |
60 | #undef DEFOP | |
61 | gdb_agent_op_last | |
62 | }; | |
63 | ||
64 | static const char *gdb_agent_op_names [gdb_agent_op_last] = | |
65 | { | |
66 | "?undef?" | |
67 | #define DEFOP(NAME, SIZE, DATA_SIZE, CONSUMED, PRODUCED, VALUE) , # NAME | |
68 | #include "ax.def" | |
69 | #undef DEFOP | |
70 | }; | |
71 | ||
72 | static const unsigned char gdb_agent_op_sizes [gdb_agent_op_last] = | |
73 | { | |
74 | 0 | |
75 | #define DEFOP(NAME, SIZE, DATA_SIZE, CONSUMED, PRODUCED, VALUE) , SIZE | |
76 | #include "ax.def" | |
77 | #undef DEFOP | |
78 | }; | |
79 | ||
80 | /* A wrapper for gdb_agent_op_names that does some bounds-checking. */ | |
81 | ||
82 | static const char * | |
83 | gdb_agent_op_name (int op) | |
84 | { | |
85 | if (op < 0 || op >= gdb_agent_op_last || gdb_agent_op_names[op] == NULL) | |
86 | return "?undef?"; | |
87 | return gdb_agent_op_names[op]; | |
88 | } | |
89 | ||
90 | #ifndef IN_PROCESS_AGENT | |
91 | ||
92 | /* The packet form of an agent expression consists of an 'X', number | |
93 | of bytes in expression, a comma, and then the bytes. */ | |
94 | ||
95 | struct agent_expr * | |
96 | gdb_parse_agent_expr (char **actparm) | |
97 | { | |
98 | char *act = *actparm; | |
99 | ULONGEST xlen; | |
100 | struct agent_expr *aexpr; | |
101 | ||
102 | ++act; /* skip the X */ | |
103 | act = unpack_varlen_hex (act, &xlen); | |
104 | ++act; /* skip a comma */ | |
105 | aexpr = xmalloc (sizeof (struct agent_expr)); | |
106 | aexpr->length = xlen; | |
107 | aexpr->bytes = xmalloc (xlen); | |
a7191e8b | 108 | hex2bin (act, aexpr->bytes, xlen); |
9f14eebc LM |
109 | *actparm = act + (xlen * 2); |
110 | return aexpr; | |
111 | } | |
112 | ||
113 | /* Convert the bytes of an agent expression back into hex digits, so | |
114 | they can be printed or uploaded. This allocates the buffer, | |
115 | callers should free when they are done with it. */ | |
116 | ||
117 | char * | |
118 | gdb_unparse_agent_expr (struct agent_expr *aexpr) | |
119 | { | |
120 | char *rslt; | |
121 | ||
122 | rslt = xmalloc (2 * aexpr->length + 1); | |
e9371aff | 123 | bin2hex (aexpr->bytes, rslt, aexpr->length); |
9f14eebc LM |
124 | return rslt; |
125 | } | |
126 | ||
127 | /* Bytecode compilation. */ | |
128 | ||
129 | CORE_ADDR current_insn_ptr; | |
130 | ||
131 | int emit_error; | |
132 | ||
133 | struct bytecode_address | |
134 | { | |
135 | int pc; | |
136 | CORE_ADDR address; | |
137 | int goto_pc; | |
138 | /* Offset and size of field to be modified in the goto block. */ | |
139 | int from_offset, from_size; | |
140 | struct bytecode_address *next; | |
141 | } *bytecode_address_table; | |
142 | ||
143 | void | |
144 | emit_prologue (void) | |
145 | { | |
146 | target_emit_ops ()->emit_prologue (); | |
147 | } | |
148 | ||
149 | void | |
150 | emit_epilogue (void) | |
151 | { | |
152 | target_emit_ops ()->emit_epilogue (); | |
153 | } | |
154 | ||
155 | static void | |
156 | emit_add (void) | |
157 | { | |
158 | target_emit_ops ()->emit_add (); | |
159 | } | |
160 | ||
161 | static void | |
162 | emit_sub (void) | |
163 | { | |
164 | target_emit_ops ()->emit_sub (); | |
165 | } | |
166 | ||
167 | static void | |
168 | emit_mul (void) | |
169 | { | |
170 | target_emit_ops ()->emit_mul (); | |
171 | } | |
172 | ||
173 | static void | |
174 | emit_lsh (void) | |
175 | { | |
176 | target_emit_ops ()->emit_lsh (); | |
177 | } | |
178 | ||
179 | static void | |
180 | emit_rsh_signed (void) | |
181 | { | |
182 | target_emit_ops ()->emit_rsh_signed (); | |
183 | } | |
184 | ||
185 | static void | |
186 | emit_rsh_unsigned (void) | |
187 | { | |
188 | target_emit_ops ()->emit_rsh_unsigned (); | |
189 | } | |
190 | ||
191 | static void | |
192 | emit_ext (int arg) | |
193 | { | |
194 | target_emit_ops ()->emit_ext (arg); | |
195 | } | |
196 | ||
197 | static void | |
198 | emit_log_not (void) | |
199 | { | |
200 | target_emit_ops ()->emit_log_not (); | |
201 | } | |
202 | ||
203 | static void | |
204 | emit_bit_and (void) | |
205 | { | |
206 | target_emit_ops ()->emit_bit_and (); | |
207 | } | |
208 | ||
209 | static void | |
210 | emit_bit_or (void) | |
211 | { | |
212 | target_emit_ops ()->emit_bit_or (); | |
213 | } | |
214 | ||
215 | static void | |
216 | emit_bit_xor (void) | |
217 | { | |
218 | target_emit_ops ()->emit_bit_xor (); | |
219 | } | |
220 | ||
221 | static void | |
222 | emit_bit_not (void) | |
223 | { | |
224 | target_emit_ops ()->emit_bit_not (); | |
225 | } | |
226 | ||
227 | static void | |
228 | emit_equal (void) | |
229 | { | |
230 | target_emit_ops ()->emit_equal (); | |
231 | } | |
232 | ||
233 | static void | |
234 | emit_less_signed (void) | |
235 | { | |
236 | target_emit_ops ()->emit_less_signed (); | |
237 | } | |
238 | ||
239 | static void | |
240 | emit_less_unsigned (void) | |
241 | { | |
242 | target_emit_ops ()->emit_less_unsigned (); | |
243 | } | |
244 | ||
245 | static void | |
246 | emit_ref (int size) | |
247 | { | |
248 | target_emit_ops ()->emit_ref (size); | |
249 | } | |
250 | ||
251 | static void | |
252 | emit_if_goto (int *offset_p, int *size_p) | |
253 | { | |
254 | target_emit_ops ()->emit_if_goto (offset_p, size_p); | |
255 | } | |
256 | ||
257 | static void | |
258 | emit_goto (int *offset_p, int *size_p) | |
259 | { | |
260 | target_emit_ops ()->emit_goto (offset_p, size_p); | |
261 | } | |
262 | ||
263 | static void | |
264 | write_goto_address (CORE_ADDR from, CORE_ADDR to, int size) | |
265 | { | |
266 | target_emit_ops ()->write_goto_address (from, to, size); | |
267 | } | |
268 | ||
269 | static void | |
270 | emit_const (LONGEST num) | |
271 | { | |
272 | target_emit_ops ()->emit_const (num); | |
273 | } | |
274 | ||
275 | static void | |
276 | emit_reg (int reg) | |
277 | { | |
278 | target_emit_ops ()->emit_reg (reg); | |
279 | } | |
280 | ||
281 | static void | |
282 | emit_pop (void) | |
283 | { | |
284 | target_emit_ops ()->emit_pop (); | |
285 | } | |
286 | ||
287 | static void | |
288 | emit_stack_flush (void) | |
289 | { | |
290 | target_emit_ops ()->emit_stack_flush (); | |
291 | } | |
292 | ||
293 | static void | |
294 | emit_zero_ext (int arg) | |
295 | { | |
296 | target_emit_ops ()->emit_zero_ext (arg); | |
297 | } | |
298 | ||
299 | static void | |
300 | emit_swap (void) | |
301 | { | |
302 | target_emit_ops ()->emit_swap (); | |
303 | } | |
304 | ||
305 | static void | |
306 | emit_stack_adjust (int n) | |
307 | { | |
308 | target_emit_ops ()->emit_stack_adjust (n); | |
309 | } | |
310 | ||
311 | /* FN's prototype is `LONGEST(*fn)(int)'. */ | |
312 | ||
313 | static void | |
314 | emit_int_call_1 (CORE_ADDR fn, int arg1) | |
315 | { | |
316 | target_emit_ops ()->emit_int_call_1 (fn, arg1); | |
317 | } | |
318 | ||
319 | /* FN's prototype is `void(*fn)(int,LONGEST)'. */ | |
320 | ||
321 | static void | |
322 | emit_void_call_2 (CORE_ADDR fn, int arg1) | |
323 | { | |
324 | target_emit_ops ()->emit_void_call_2 (fn, arg1); | |
325 | } | |
326 | ||
327 | static void | |
328 | emit_eq_goto (int *offset_p, int *size_p) | |
329 | { | |
330 | target_emit_ops ()->emit_eq_goto (offset_p, size_p); | |
331 | } | |
332 | ||
333 | static void | |
334 | emit_ne_goto (int *offset_p, int *size_p) | |
335 | { | |
336 | target_emit_ops ()->emit_ne_goto (offset_p, size_p); | |
337 | } | |
338 | ||
339 | static void | |
340 | emit_lt_goto (int *offset_p, int *size_p) | |
341 | { | |
342 | target_emit_ops ()->emit_lt_goto (offset_p, size_p); | |
343 | } | |
344 | ||
345 | static void | |
346 | emit_ge_goto (int *offset_p, int *size_p) | |
347 | { | |
348 | target_emit_ops ()->emit_ge_goto (offset_p, size_p); | |
349 | } | |
350 | ||
351 | static void | |
352 | emit_gt_goto (int *offset_p, int *size_p) | |
353 | { | |
354 | target_emit_ops ()->emit_gt_goto (offset_p, size_p); | |
355 | } | |
356 | ||
357 | static void | |
358 | emit_le_goto (int *offset_p, int *size_p) | |
359 | { | |
360 | target_emit_ops ()->emit_le_goto (offset_p, size_p); | |
361 | } | |
362 | ||
363 | /* Scan an agent expression for any evidence that the given PC is the | |
364 | target of a jump bytecode in the expression. */ | |
365 | ||
366 | int | |
367 | is_goto_target (struct agent_expr *aexpr, int pc) | |
368 | { | |
369 | int i; | |
370 | unsigned char op; | |
371 | ||
372 | for (i = 0; i < aexpr->length; i += 1 + gdb_agent_op_sizes[op]) | |
373 | { | |
374 | op = aexpr->bytes[i]; | |
375 | ||
376 | if (op == gdb_agent_op_goto || op == gdb_agent_op_if_goto) | |
377 | { | |
378 | int target = (aexpr->bytes[i + 1] << 8) + aexpr->bytes[i + 2]; | |
379 | if (target == pc) | |
380 | return 1; | |
381 | } | |
382 | } | |
383 | ||
384 | return 0; | |
385 | } | |
386 | ||
387 | /* Given an agent expression, turn it into native code. */ | |
388 | ||
389 | enum eval_result_type | |
390 | compile_bytecodes (struct agent_expr *aexpr) | |
391 | { | |
392 | int pc = 0; | |
393 | int done = 0; | |
394 | unsigned char op, next_op; | |
395 | int arg; | |
396 | /* This is only used to build 64-bit value for constants. */ | |
397 | ULONGEST top; | |
398 | struct bytecode_address *aentry, *aentry2; | |
399 | ||
400 | #define UNHANDLED \ | |
401 | do \ | |
402 | { \ | |
403 | ax_debug ("Cannot compile op 0x%x\n", op); \ | |
404 | return expr_eval_unhandled_opcode; \ | |
405 | } while (0) | |
406 | ||
407 | if (aexpr->length == 0) | |
408 | { | |
409 | ax_debug ("empty agent expression\n"); | |
410 | return expr_eval_empty_expression; | |
411 | } | |
412 | ||
413 | bytecode_address_table = NULL; | |
414 | ||
415 | while (!done) | |
416 | { | |
417 | op = aexpr->bytes[pc]; | |
418 | ||
419 | ax_debug ("About to compile op 0x%x, pc=%d\n", op, pc); | |
420 | ||
421 | /* Record the compiled-code address of the bytecode, for use by | |
422 | jump instructions. */ | |
423 | aentry = xmalloc (sizeof (struct bytecode_address)); | |
424 | aentry->pc = pc; | |
425 | aentry->address = current_insn_ptr; | |
426 | aentry->goto_pc = -1; | |
427 | aentry->from_offset = aentry->from_size = 0; | |
428 | aentry->next = bytecode_address_table; | |
429 | bytecode_address_table = aentry; | |
430 | ||
431 | ++pc; | |
432 | ||
433 | emit_error = 0; | |
434 | ||
435 | switch (op) | |
436 | { | |
437 | case gdb_agent_op_add: | |
438 | emit_add (); | |
439 | break; | |
440 | ||
441 | case gdb_agent_op_sub: | |
442 | emit_sub (); | |
443 | break; | |
444 | ||
445 | case gdb_agent_op_mul: | |
446 | emit_mul (); | |
447 | break; | |
448 | ||
449 | case gdb_agent_op_div_signed: | |
450 | UNHANDLED; | |
451 | break; | |
452 | ||
453 | case gdb_agent_op_div_unsigned: | |
454 | UNHANDLED; | |
455 | break; | |
456 | ||
457 | case gdb_agent_op_rem_signed: | |
458 | UNHANDLED; | |
459 | break; | |
460 | ||
461 | case gdb_agent_op_rem_unsigned: | |
462 | UNHANDLED; | |
463 | break; | |
464 | ||
465 | case gdb_agent_op_lsh: | |
466 | emit_lsh (); | |
467 | break; | |
468 | ||
469 | case gdb_agent_op_rsh_signed: | |
470 | emit_rsh_signed (); | |
471 | break; | |
472 | ||
473 | case gdb_agent_op_rsh_unsigned: | |
474 | emit_rsh_unsigned (); | |
475 | break; | |
476 | ||
477 | case gdb_agent_op_trace: | |
478 | UNHANDLED; | |
479 | break; | |
480 | ||
481 | case gdb_agent_op_trace_quick: | |
482 | UNHANDLED; | |
483 | break; | |
484 | ||
485 | case gdb_agent_op_log_not: | |
486 | emit_log_not (); | |
487 | break; | |
488 | ||
489 | case gdb_agent_op_bit_and: | |
490 | emit_bit_and (); | |
491 | break; | |
492 | ||
493 | case gdb_agent_op_bit_or: | |
494 | emit_bit_or (); | |
495 | break; | |
496 | ||
497 | case gdb_agent_op_bit_xor: | |
498 | emit_bit_xor (); | |
499 | break; | |
500 | ||
501 | case gdb_agent_op_bit_not: | |
502 | emit_bit_not (); | |
503 | break; | |
504 | ||
505 | case gdb_agent_op_equal: | |
506 | next_op = aexpr->bytes[pc]; | |
507 | if (next_op == gdb_agent_op_if_goto | |
508 | && !is_goto_target (aexpr, pc) | |
509 | && target_emit_ops ()->emit_eq_goto) | |
510 | { | |
511 | ax_debug ("Combining equal & if_goto"); | |
512 | pc += 1; | |
513 | aentry->pc = pc; | |
514 | arg = aexpr->bytes[pc++]; | |
515 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
516 | aentry->goto_pc = arg; | |
517 | emit_eq_goto (&(aentry->from_offset), &(aentry->from_size)); | |
518 | } | |
519 | else if (next_op == gdb_agent_op_log_not | |
520 | && (aexpr->bytes[pc + 1] == gdb_agent_op_if_goto) | |
521 | && !is_goto_target (aexpr, pc + 1) | |
522 | && target_emit_ops ()->emit_ne_goto) | |
523 | { | |
524 | ax_debug ("Combining equal & log_not & if_goto"); | |
525 | pc += 2; | |
526 | aentry->pc = pc; | |
527 | arg = aexpr->bytes[pc++]; | |
528 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
529 | aentry->goto_pc = arg; | |
530 | emit_ne_goto (&(aentry->from_offset), &(aentry->from_size)); | |
531 | } | |
532 | else | |
533 | emit_equal (); | |
534 | break; | |
535 | ||
536 | case gdb_agent_op_less_signed: | |
537 | next_op = aexpr->bytes[pc]; | |
538 | if (next_op == gdb_agent_op_if_goto | |
539 | && !is_goto_target (aexpr, pc)) | |
540 | { | |
541 | ax_debug ("Combining less_signed & if_goto"); | |
542 | pc += 1; | |
543 | aentry->pc = pc; | |
544 | arg = aexpr->bytes[pc++]; | |
545 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
546 | aentry->goto_pc = arg; | |
547 | emit_lt_goto (&(aentry->from_offset), &(aentry->from_size)); | |
548 | } | |
549 | else if (next_op == gdb_agent_op_log_not | |
550 | && !is_goto_target (aexpr, pc) | |
551 | && (aexpr->bytes[pc + 1] == gdb_agent_op_if_goto) | |
552 | && !is_goto_target (aexpr, pc + 1)) | |
553 | { | |
554 | ax_debug ("Combining less_signed & log_not & if_goto"); | |
555 | pc += 2; | |
556 | aentry->pc = pc; | |
557 | arg = aexpr->bytes[pc++]; | |
558 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
559 | aentry->goto_pc = arg; | |
560 | emit_ge_goto (&(aentry->from_offset), &(aentry->from_size)); | |
561 | } | |
562 | else | |
563 | emit_less_signed (); | |
564 | break; | |
565 | ||
566 | case gdb_agent_op_less_unsigned: | |
567 | emit_less_unsigned (); | |
568 | break; | |
569 | ||
570 | case gdb_agent_op_ext: | |
571 | arg = aexpr->bytes[pc++]; | |
572 | if (arg < (sizeof (LONGEST) * 8)) | |
573 | emit_ext (arg); | |
574 | break; | |
575 | ||
576 | case gdb_agent_op_ref8: | |
577 | emit_ref (1); | |
578 | break; | |
579 | ||
580 | case gdb_agent_op_ref16: | |
581 | emit_ref (2); | |
582 | break; | |
583 | ||
584 | case gdb_agent_op_ref32: | |
585 | emit_ref (4); | |
586 | break; | |
587 | ||
588 | case gdb_agent_op_ref64: | |
589 | emit_ref (8); | |
590 | break; | |
591 | ||
592 | case gdb_agent_op_if_goto: | |
593 | arg = aexpr->bytes[pc++]; | |
594 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
595 | aentry->goto_pc = arg; | |
596 | emit_if_goto (&(aentry->from_offset), &(aentry->from_size)); | |
597 | break; | |
598 | ||
599 | case gdb_agent_op_goto: | |
600 | arg = aexpr->bytes[pc++]; | |
601 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
602 | aentry->goto_pc = arg; | |
603 | emit_goto (&(aentry->from_offset), &(aentry->from_size)); | |
604 | break; | |
605 | ||
606 | case gdb_agent_op_const8: | |
607 | emit_stack_flush (); | |
608 | top = aexpr->bytes[pc++]; | |
609 | emit_const (top); | |
610 | break; | |
611 | ||
612 | case gdb_agent_op_const16: | |
613 | emit_stack_flush (); | |
614 | top = aexpr->bytes[pc++]; | |
615 | top = (top << 8) + aexpr->bytes[pc++]; | |
616 | emit_const (top); | |
617 | break; | |
618 | ||
619 | case gdb_agent_op_const32: | |
620 | emit_stack_flush (); | |
621 | top = aexpr->bytes[pc++]; | |
622 | top = (top << 8) + aexpr->bytes[pc++]; | |
623 | top = (top << 8) + aexpr->bytes[pc++]; | |
624 | top = (top << 8) + aexpr->bytes[pc++]; | |
625 | emit_const (top); | |
626 | break; | |
627 | ||
628 | case gdb_agent_op_const64: | |
629 | emit_stack_flush (); | |
630 | top = aexpr->bytes[pc++]; | |
631 | top = (top << 8) + aexpr->bytes[pc++]; | |
632 | top = (top << 8) + aexpr->bytes[pc++]; | |
633 | top = (top << 8) + aexpr->bytes[pc++]; | |
634 | top = (top << 8) + aexpr->bytes[pc++]; | |
635 | top = (top << 8) + aexpr->bytes[pc++]; | |
636 | top = (top << 8) + aexpr->bytes[pc++]; | |
637 | top = (top << 8) + aexpr->bytes[pc++]; | |
638 | emit_const (top); | |
639 | break; | |
640 | ||
641 | case gdb_agent_op_reg: | |
642 | emit_stack_flush (); | |
643 | arg = aexpr->bytes[pc++]; | |
644 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
645 | emit_reg (arg); | |
646 | break; | |
647 | ||
648 | case gdb_agent_op_end: | |
649 | ax_debug ("At end of expression\n"); | |
650 | ||
651 | /* Assume there is one stack element left, and that it is | |
652 | cached in "top" where emit_epilogue can get to it. */ | |
653 | emit_stack_adjust (1); | |
654 | ||
655 | done = 1; | |
656 | break; | |
657 | ||
658 | case gdb_agent_op_dup: | |
659 | /* In our design, dup is equivalent to stack flushing. */ | |
660 | emit_stack_flush (); | |
661 | break; | |
662 | ||
663 | case gdb_agent_op_pop: | |
664 | emit_pop (); | |
665 | break; | |
666 | ||
667 | case gdb_agent_op_zero_ext: | |
668 | arg = aexpr->bytes[pc++]; | |
669 | if (arg < (sizeof (LONGEST) * 8)) | |
670 | emit_zero_ext (arg); | |
671 | break; | |
672 | ||
673 | case gdb_agent_op_swap: | |
674 | next_op = aexpr->bytes[pc]; | |
675 | /* Detect greater-than comparison sequences. */ | |
676 | if (next_op == gdb_agent_op_less_signed | |
677 | && !is_goto_target (aexpr, pc) | |
678 | && (aexpr->bytes[pc + 1] == gdb_agent_op_if_goto) | |
679 | && !is_goto_target (aexpr, pc + 1)) | |
680 | { | |
681 | ax_debug ("Combining swap & less_signed & if_goto"); | |
682 | pc += 2; | |
683 | aentry->pc = pc; | |
684 | arg = aexpr->bytes[pc++]; | |
685 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
686 | aentry->goto_pc = arg; | |
687 | emit_gt_goto (&(aentry->from_offset), &(aentry->from_size)); | |
688 | } | |
689 | else if (next_op == gdb_agent_op_less_signed | |
690 | && !is_goto_target (aexpr, pc) | |
691 | && (aexpr->bytes[pc + 1] == gdb_agent_op_log_not) | |
692 | && !is_goto_target (aexpr, pc + 1) | |
693 | && (aexpr->bytes[pc + 2] == gdb_agent_op_if_goto) | |
694 | && !is_goto_target (aexpr, pc + 2)) | |
695 | { | |
696 | ax_debug ("Combining swap & less_signed & log_not & if_goto"); | |
697 | pc += 3; | |
698 | aentry->pc = pc; | |
699 | arg = aexpr->bytes[pc++]; | |
700 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
701 | aentry->goto_pc = arg; | |
702 | emit_le_goto (&(aentry->from_offset), &(aentry->from_size)); | |
703 | } | |
704 | else | |
705 | emit_swap (); | |
706 | break; | |
707 | ||
708 | case gdb_agent_op_getv: | |
709 | emit_stack_flush (); | |
710 | arg = aexpr->bytes[pc++]; | |
711 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
712 | emit_int_call_1 (get_get_tsv_func_addr (), | |
713 | arg); | |
714 | break; | |
715 | ||
716 | case gdb_agent_op_setv: | |
717 | arg = aexpr->bytes[pc++]; | |
718 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
719 | emit_void_call_2 (get_set_tsv_func_addr (), | |
720 | arg); | |
721 | break; | |
722 | ||
723 | case gdb_agent_op_tracev: | |
724 | UNHANDLED; | |
725 | break; | |
726 | ||
727 | /* GDB never (currently) generates any of these ops. */ | |
728 | case gdb_agent_op_float: | |
729 | case gdb_agent_op_ref_float: | |
730 | case gdb_agent_op_ref_double: | |
731 | case gdb_agent_op_ref_long_double: | |
732 | case gdb_agent_op_l_to_d: | |
733 | case gdb_agent_op_d_to_l: | |
734 | case gdb_agent_op_trace16: | |
735 | UNHANDLED; | |
736 | break; | |
737 | ||
738 | default: | |
739 | ax_debug ("Agent expression op 0x%x not recognized\n", op); | |
740 | /* Don't struggle on, things will just get worse. */ | |
741 | return expr_eval_unrecognized_opcode; | |
742 | } | |
743 | ||
744 | /* This catches errors that occur in target-specific code | |
745 | emission. */ | |
746 | if (emit_error) | |
747 | { | |
748 | ax_debug ("Error %d while emitting code for %s\n", | |
749 | emit_error, gdb_agent_op_name (op)); | |
750 | return expr_eval_unhandled_opcode; | |
751 | } | |
752 | ||
753 | ax_debug ("Op %s compiled\n", gdb_agent_op_name (op)); | |
754 | } | |
755 | ||
756 | /* Now fill in real addresses as goto destinations. */ | |
757 | for (aentry = bytecode_address_table; aentry; aentry = aentry->next) | |
758 | { | |
759 | int written = 0; | |
760 | ||
761 | if (aentry->goto_pc < 0) | |
762 | continue; | |
763 | ||
764 | /* Find the location that we are going to, and call back into | |
765 | target-specific code to write the actual address or | |
766 | displacement. */ | |
767 | for (aentry2 = bytecode_address_table; aentry2; aentry2 = aentry2->next) | |
768 | { | |
769 | if (aentry2->pc == aentry->goto_pc) | |
770 | { | |
771 | ax_debug ("Want to jump from %s to %s\n", | |
772 | paddress (aentry->address), | |
773 | paddress (aentry2->address)); | |
774 | write_goto_address (aentry->address + aentry->from_offset, | |
775 | aentry2->address, aentry->from_size); | |
776 | written = 1; | |
777 | break; | |
778 | } | |
779 | } | |
780 | ||
781 | /* Error out if we didn't find a destination. */ | |
782 | if (!written) | |
783 | { | |
784 | ax_debug ("Destination of goto %d not found\n", | |
785 | aentry->goto_pc); | |
786 | return expr_eval_invalid_goto; | |
787 | } | |
788 | } | |
789 | ||
790 | return expr_eval_no_error; | |
791 | } | |
792 | ||
793 | #endif | |
794 | ||
d3ce09f5 SS |
795 | /* Make printf-type calls using arguments supplied from the host. We |
796 | need to parse the format string ourselves, and call the formatting | |
797 | function with one argument at a time, partly because there is no | |
798 | safe portable way to construct a varargs call, and partly to serve | |
799 | as a security barrier against bad format strings that might get | |
800 | in. */ | |
801 | ||
802 | static void | |
bbc13ae3 | 803 | ax_printf (CORE_ADDR fn, CORE_ADDR chan, const char *format, |
d3ce09f5 SS |
804 | int nargs, ULONGEST *args) |
805 | { | |
bbc13ae3 | 806 | const char *f = format; |
d3ce09f5 SS |
807 | struct format_piece *fpieces; |
808 | int i, fp; | |
809 | char *current_substring; | |
810 | int nargs_wanted; | |
811 | ||
812 | ax_debug ("Printf of \"%s\" with %d args", format, nargs); | |
813 | ||
814 | fpieces = parse_format_string (&f); | |
815 | ||
816 | nargs_wanted = 0; | |
817 | for (fp = 0; fpieces[fp].string != NULL; fp++) | |
818 | if (fpieces[fp].argclass != literal_piece) | |
819 | ++nargs_wanted; | |
820 | ||
821 | if (nargs != nargs_wanted) | |
822 | error (_("Wrong number of arguments for specified format-string")); | |
823 | ||
824 | i = 0; | |
825 | for (fp = 0; fpieces[fp].string != NULL; fp++) | |
826 | { | |
827 | current_substring = fpieces[fp].string; | |
828 | ax_debug ("current substring is '%s', class is %d", | |
829 | current_substring, fpieces[fp].argclass); | |
830 | switch (fpieces[fp].argclass) | |
831 | { | |
832 | case string_arg: | |
833 | { | |
834 | gdb_byte *str; | |
835 | CORE_ADDR tem; | |
836 | int j; | |
837 | ||
838 | tem = args[i]; | |
839 | ||
840 | /* This is a %s argument. Find the length of the string. */ | |
841 | for (j = 0;; j++) | |
842 | { | |
843 | gdb_byte c; | |
844 | ||
845 | read_inferior_memory (tem + j, &c, 1); | |
846 | if (c == 0) | |
847 | break; | |
848 | } | |
849 | ||
850 | /* Copy the string contents into a string inside GDB. */ | |
851 | str = (gdb_byte *) alloca (j + 1); | |
852 | if (j != 0) | |
853 | read_inferior_memory (tem, str, j); | |
854 | str[j] = 0; | |
855 | ||
856 | printf (current_substring, (char *) str); | |
857 | } | |
858 | break; | |
859 | ||
860 | case long_long_arg: | |
861 | #if defined (CC_HAS_LONG_LONG) && defined (PRINTF_HAS_LONG_LONG) | |
862 | { | |
863 | long long val = args[i]; | |
864 | ||
865 | printf (current_substring, val); | |
866 | break; | |
867 | } | |
868 | #else | |
869 | error (_("long long not supported in agent printf")); | |
870 | #endif | |
871 | case int_arg: | |
872 | { | |
873 | int val = args[i]; | |
874 | ||
875 | printf (current_substring, val); | |
876 | break; | |
877 | } | |
878 | ||
879 | case long_arg: | |
880 | { | |
881 | long val = args[i]; | |
882 | ||
883 | printf (current_substring, val); | |
884 | break; | |
885 | } | |
886 | ||
887 | case literal_piece: | |
888 | /* Print a portion of the format string that has no | |
889 | directives. Note that this will not include any | |
890 | ordinary %-specs, but it might include "%%". That is | |
891 | why we use printf_filtered and not puts_filtered here. | |
892 | Also, we pass a dummy argument because some platforms | |
893 | have modified GCC to include -Wformat-security by | |
894 | default, which will warn here if there is no | |
895 | argument. */ | |
896 | printf (current_substring, 0); | |
897 | break; | |
898 | ||
899 | default: | |
900 | error (_("Format directive in '%s' not supported in agent printf"), | |
901 | current_substring); | |
902 | } | |
903 | ||
904 | /* Maybe advance to the next argument. */ | |
905 | if (fpieces[fp].argclass != literal_piece) | |
906 | ++i; | |
907 | } | |
908 | ||
909 | free_format_pieces (fpieces); | |
f6150862 | 910 | fflush (stdout); |
d3ce09f5 SS |
911 | } |
912 | ||
9f14eebc LM |
913 | /* The agent expression evaluator, as specified by the GDB docs. It |
914 | returns 0 if everything went OK, and a nonzero error code | |
915 | otherwise. */ | |
916 | ||
917 | enum eval_result_type | |
5ae4861a | 918 | gdb_eval_agent_expr (struct eval_agent_expr_context *ctx, |
9f14eebc LM |
919 | struct agent_expr *aexpr, |
920 | ULONGEST *rslt) | |
921 | { | |
922 | int pc = 0; | |
923 | #define STACK_MAX 100 | |
924 | ULONGEST stack[STACK_MAX], top; | |
925 | int sp = 0; | |
926 | unsigned char op; | |
927 | int arg; | |
928 | ||
929 | /* This union is a convenient way to convert representations. For | |
930 | now, assume a standard architecture where the hardware integer | |
931 | types have 8, 16, 32, 64 bit types. A more robust solution would | |
932 | be to import stdint.h from gnulib. */ | |
933 | union | |
934 | { | |
935 | union | |
936 | { | |
937 | unsigned char bytes[1]; | |
938 | unsigned char val; | |
939 | } u8; | |
940 | union | |
941 | { | |
942 | unsigned char bytes[2]; | |
943 | unsigned short val; | |
944 | } u16; | |
945 | union | |
946 | { | |
947 | unsigned char bytes[4]; | |
948 | unsigned int val; | |
949 | } u32; | |
950 | union | |
951 | { | |
952 | unsigned char bytes[8]; | |
953 | ULONGEST val; | |
954 | } u64; | |
955 | } cnv; | |
956 | ||
957 | if (aexpr->length == 0) | |
958 | { | |
959 | ax_debug ("empty agent expression"); | |
960 | return expr_eval_empty_expression; | |
961 | } | |
962 | ||
963 | /* Cache the stack top in its own variable. Much of the time we can | |
964 | operate on this variable, rather than dinking with the stack. It | |
965 | needs to be copied to the stack when sp changes. */ | |
966 | top = 0; | |
967 | ||
968 | while (1) | |
969 | { | |
970 | op = aexpr->bytes[pc++]; | |
971 | ||
972 | ax_debug ("About to interpret byte 0x%x", op); | |
973 | ||
974 | switch (op) | |
975 | { | |
976 | case gdb_agent_op_add: | |
977 | top += stack[--sp]; | |
978 | break; | |
979 | ||
980 | case gdb_agent_op_sub: | |
981 | top = stack[--sp] - top; | |
982 | break; | |
983 | ||
984 | case gdb_agent_op_mul: | |
985 | top *= stack[--sp]; | |
986 | break; | |
987 | ||
988 | case gdb_agent_op_div_signed: | |
989 | if (top == 0) | |
990 | { | |
991 | ax_debug ("Attempted to divide by zero"); | |
992 | return expr_eval_divide_by_zero; | |
993 | } | |
994 | top = ((LONGEST) stack[--sp]) / ((LONGEST) top); | |
995 | break; | |
996 | ||
997 | case gdb_agent_op_div_unsigned: | |
998 | if (top == 0) | |
999 | { | |
1000 | ax_debug ("Attempted to divide by zero"); | |
1001 | return expr_eval_divide_by_zero; | |
1002 | } | |
1003 | top = stack[--sp] / top; | |
1004 | break; | |
1005 | ||
1006 | case gdb_agent_op_rem_signed: | |
1007 | if (top == 0) | |
1008 | { | |
1009 | ax_debug ("Attempted to divide by zero"); | |
1010 | return expr_eval_divide_by_zero; | |
1011 | } | |
1012 | top = ((LONGEST) stack[--sp]) % ((LONGEST) top); | |
1013 | break; | |
1014 | ||
1015 | case gdb_agent_op_rem_unsigned: | |
1016 | if (top == 0) | |
1017 | { | |
1018 | ax_debug ("Attempted to divide by zero"); | |
1019 | return expr_eval_divide_by_zero; | |
1020 | } | |
1021 | top = stack[--sp] % top; | |
1022 | break; | |
1023 | ||
1024 | case gdb_agent_op_lsh: | |
1025 | top = stack[--sp] << top; | |
1026 | break; | |
1027 | ||
1028 | case gdb_agent_op_rsh_signed: | |
1029 | top = ((LONGEST) stack[--sp]) >> top; | |
1030 | break; | |
1031 | ||
1032 | case gdb_agent_op_rsh_unsigned: | |
1033 | top = stack[--sp] >> top; | |
1034 | break; | |
1035 | ||
1036 | case gdb_agent_op_trace: | |
5ae4861a YQ |
1037 | agent_mem_read (ctx, NULL, (CORE_ADDR) stack[--sp], |
1038 | (ULONGEST) top); | |
9f14eebc LM |
1039 | if (--sp >= 0) |
1040 | top = stack[sp]; | |
1041 | break; | |
1042 | ||
1043 | case gdb_agent_op_trace_quick: | |
1044 | arg = aexpr->bytes[pc++]; | |
5ae4861a | 1045 | agent_mem_read (ctx, NULL, (CORE_ADDR) top, (ULONGEST) arg); |
9f14eebc LM |
1046 | break; |
1047 | ||
1048 | case gdb_agent_op_log_not: | |
1049 | top = !top; | |
1050 | break; | |
1051 | ||
1052 | case gdb_agent_op_bit_and: | |
1053 | top &= stack[--sp]; | |
1054 | break; | |
1055 | ||
1056 | case gdb_agent_op_bit_or: | |
1057 | top |= stack[--sp]; | |
1058 | break; | |
1059 | ||
1060 | case gdb_agent_op_bit_xor: | |
1061 | top ^= stack[--sp]; | |
1062 | break; | |
1063 | ||
1064 | case gdb_agent_op_bit_not: | |
1065 | top = ~top; | |
1066 | break; | |
1067 | ||
1068 | case gdb_agent_op_equal: | |
1069 | top = (stack[--sp] == top); | |
1070 | break; | |
1071 | ||
1072 | case gdb_agent_op_less_signed: | |
1073 | top = (((LONGEST) stack[--sp]) < ((LONGEST) top)); | |
1074 | break; | |
1075 | ||
1076 | case gdb_agent_op_less_unsigned: | |
1077 | top = (stack[--sp] < top); | |
1078 | break; | |
1079 | ||
1080 | case gdb_agent_op_ext: | |
1081 | arg = aexpr->bytes[pc++]; | |
1082 | if (arg < (sizeof (LONGEST) * 8)) | |
1083 | { | |
1084 | LONGEST mask = 1 << (arg - 1); | |
1085 | top &= ((LONGEST) 1 << arg) - 1; | |
1086 | top = (top ^ mask) - mask; | |
1087 | } | |
1088 | break; | |
1089 | ||
1090 | case gdb_agent_op_ref8: | |
5ae4861a | 1091 | agent_mem_read (ctx, cnv.u8.bytes, (CORE_ADDR) top, 1); |
9f14eebc LM |
1092 | top = cnv.u8.val; |
1093 | break; | |
1094 | ||
1095 | case gdb_agent_op_ref16: | |
5ae4861a | 1096 | agent_mem_read (ctx, cnv.u16.bytes, (CORE_ADDR) top, 2); |
9f14eebc LM |
1097 | top = cnv.u16.val; |
1098 | break; | |
1099 | ||
1100 | case gdb_agent_op_ref32: | |
5ae4861a | 1101 | agent_mem_read (ctx, cnv.u32.bytes, (CORE_ADDR) top, 4); |
9f14eebc LM |
1102 | top = cnv.u32.val; |
1103 | break; | |
1104 | ||
1105 | case gdb_agent_op_ref64: | |
5ae4861a | 1106 | agent_mem_read (ctx, cnv.u64.bytes, (CORE_ADDR) top, 8); |
9f14eebc LM |
1107 | top = cnv.u64.val; |
1108 | break; | |
1109 | ||
1110 | case gdb_agent_op_if_goto: | |
1111 | if (top) | |
1112 | pc = (aexpr->bytes[pc] << 8) + (aexpr->bytes[pc + 1]); | |
1113 | else | |
1114 | pc += 2; | |
1115 | if (--sp >= 0) | |
1116 | top = stack[sp]; | |
1117 | break; | |
1118 | ||
1119 | case gdb_agent_op_goto: | |
1120 | pc = (aexpr->bytes[pc] << 8) + (aexpr->bytes[pc + 1]); | |
1121 | break; | |
1122 | ||
1123 | case gdb_agent_op_const8: | |
1124 | /* Flush the cached stack top. */ | |
1125 | stack[sp++] = top; | |
1126 | top = aexpr->bytes[pc++]; | |
1127 | break; | |
1128 | ||
1129 | case gdb_agent_op_const16: | |
1130 | /* Flush the cached stack top. */ | |
1131 | stack[sp++] = top; | |
1132 | top = aexpr->bytes[pc++]; | |
1133 | top = (top << 8) + aexpr->bytes[pc++]; | |
1134 | break; | |
1135 | ||
1136 | case gdb_agent_op_const32: | |
1137 | /* Flush the cached stack top. */ | |
1138 | stack[sp++] = top; | |
1139 | top = aexpr->bytes[pc++]; | |
1140 | top = (top << 8) + aexpr->bytes[pc++]; | |
1141 | top = (top << 8) + aexpr->bytes[pc++]; | |
1142 | top = (top << 8) + aexpr->bytes[pc++]; | |
1143 | break; | |
1144 | ||
1145 | case gdb_agent_op_const64: | |
1146 | /* Flush the cached stack top. */ | |
1147 | stack[sp++] = top; | |
1148 | top = aexpr->bytes[pc++]; | |
1149 | top = (top << 8) + aexpr->bytes[pc++]; | |
1150 | top = (top << 8) + aexpr->bytes[pc++]; | |
1151 | top = (top << 8) + aexpr->bytes[pc++]; | |
1152 | top = (top << 8) + aexpr->bytes[pc++]; | |
1153 | top = (top << 8) + aexpr->bytes[pc++]; | |
1154 | top = (top << 8) + aexpr->bytes[pc++]; | |
1155 | top = (top << 8) + aexpr->bytes[pc++]; | |
1156 | break; | |
1157 | ||
1158 | case gdb_agent_op_reg: | |
1159 | /* Flush the cached stack top. */ | |
1160 | stack[sp++] = top; | |
1161 | arg = aexpr->bytes[pc++]; | |
1162 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
1163 | { | |
1164 | int regnum = arg; | |
5ae4861a | 1165 | struct regcache *regcache = ctx->regcache; |
9f14eebc | 1166 | |
3aee8918 | 1167 | switch (register_size (regcache->tdesc, regnum)) |
9f14eebc LM |
1168 | { |
1169 | case 8: | |
1170 | collect_register (regcache, regnum, cnv.u64.bytes); | |
1171 | top = cnv.u64.val; | |
1172 | break; | |
1173 | case 4: | |
1174 | collect_register (regcache, regnum, cnv.u32.bytes); | |
1175 | top = cnv.u32.val; | |
1176 | break; | |
1177 | case 2: | |
1178 | collect_register (regcache, regnum, cnv.u16.bytes); | |
1179 | top = cnv.u16.val; | |
1180 | break; | |
1181 | case 1: | |
1182 | collect_register (regcache, regnum, cnv.u8.bytes); | |
1183 | top = cnv.u8.val; | |
1184 | break; | |
1185 | default: | |
1186 | internal_error (__FILE__, __LINE__, | |
1187 | "unhandled register size"); | |
1188 | } | |
1189 | } | |
1190 | break; | |
1191 | ||
1192 | case gdb_agent_op_end: | |
1193 | ax_debug ("At end of expression, sp=%d, stack top cache=0x%s", | |
1194 | sp, pulongest (top)); | |
1195 | if (rslt) | |
1196 | { | |
1197 | if (sp <= 0) | |
1198 | { | |
1199 | /* This should be an error */ | |
1200 | ax_debug ("Stack is empty, nothing to return"); | |
1201 | return expr_eval_empty_stack; | |
1202 | } | |
1203 | *rslt = top; | |
1204 | } | |
1205 | return expr_eval_no_error; | |
1206 | ||
1207 | case gdb_agent_op_dup: | |
1208 | stack[sp++] = top; | |
1209 | break; | |
1210 | ||
1211 | case gdb_agent_op_pop: | |
1212 | if (--sp >= 0) | |
1213 | top = stack[sp]; | |
1214 | break; | |
1215 | ||
1216 | case gdb_agent_op_pick: | |
1217 | arg = aexpr->bytes[pc++]; | |
1218 | stack[sp] = top; | |
1219 | top = stack[sp - arg]; | |
1220 | ++sp; | |
1221 | break; | |
1222 | ||
1223 | case gdb_agent_op_rot: | |
1224 | { | |
1225 | ULONGEST tem = stack[sp - 1]; | |
1226 | ||
1227 | stack[sp - 1] = stack[sp - 2]; | |
1228 | stack[sp - 2] = top; | |
1229 | top = tem; | |
1230 | } | |
1231 | break; | |
1232 | ||
1233 | case gdb_agent_op_zero_ext: | |
1234 | arg = aexpr->bytes[pc++]; | |
1235 | if (arg < (sizeof (LONGEST) * 8)) | |
1236 | top &= ((LONGEST) 1 << arg) - 1; | |
1237 | break; | |
1238 | ||
1239 | case gdb_agent_op_swap: | |
1240 | /* Interchange top two stack elements, making sure top gets | |
1241 | copied back onto stack. */ | |
1242 | stack[sp] = top; | |
1243 | top = stack[sp - 1]; | |
1244 | stack[sp - 1] = stack[sp]; | |
1245 | break; | |
1246 | ||
1247 | case gdb_agent_op_getv: | |
1248 | /* Flush the cached stack top. */ | |
1249 | stack[sp++] = top; | |
1250 | arg = aexpr->bytes[pc++]; | |
1251 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
1252 | top = agent_get_trace_state_variable_value (arg); | |
1253 | break; | |
1254 | ||
1255 | case gdb_agent_op_setv: | |
1256 | arg = aexpr->bytes[pc++]; | |
1257 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
1258 | agent_set_trace_state_variable_value (arg, top); | |
1259 | /* Note that we leave the value on the stack, for the | |
1260 | benefit of later/enclosing expressions. */ | |
1261 | break; | |
1262 | ||
1263 | case gdb_agent_op_tracev: | |
1264 | arg = aexpr->bytes[pc++]; | |
1265 | arg = (arg << 8) + aexpr->bytes[pc++]; | |
5ae4861a | 1266 | agent_tsv_read (ctx, arg); |
9f14eebc LM |
1267 | break; |
1268 | ||
1269 | case gdb_agent_op_tracenz: | |
5ae4861a | 1270 | agent_mem_read_string (ctx, NULL, (CORE_ADDR) stack[--sp], |
9f14eebc LM |
1271 | (ULONGEST) top); |
1272 | if (--sp >= 0) | |
1273 | top = stack[sp]; | |
1274 | break; | |
1275 | ||
d3ce09f5 SS |
1276 | case gdb_agent_op_printf: |
1277 | { | |
1278 | int nargs, slen, i; | |
1279 | CORE_ADDR fn = 0, chan = 0; | |
1280 | /* Can't have more args than the entire size of the stack. */ | |
1281 | ULONGEST args[STACK_MAX]; | |
1282 | char *format; | |
1283 | ||
1284 | nargs = aexpr->bytes[pc++]; | |
1285 | slen = aexpr->bytes[pc++]; | |
1286 | slen = (slen << 8) + aexpr->bytes[pc++]; | |
1287 | format = (char *) &(aexpr->bytes[pc]); | |
1288 | pc += slen; | |
1289 | /* Pop function and channel. */ | |
1290 | fn = top; | |
1291 | if (--sp >= 0) | |
1292 | top = stack[sp]; | |
1293 | chan = top; | |
1294 | if (--sp >= 0) | |
1295 | top = stack[sp]; | |
1296 | /* Pop arguments into a dedicated array. */ | |
1297 | for (i = 0; i < nargs; ++i) | |
1298 | { | |
1299 | args[i] = top; | |
1300 | if (--sp >= 0) | |
1301 | top = stack[sp]; | |
1302 | } | |
1303 | ||
1304 | /* A bad format string means something is very wrong; give | |
1305 | up immediately. */ | |
1306 | if (format[slen - 1] != '\0') | |
1307 | error (_("Unterminated format string in printf bytecode")); | |
1308 | ||
1309 | ax_printf (fn, chan, format, nargs, args); | |
1310 | } | |
1311 | break; | |
1312 | ||
9f14eebc LM |
1313 | /* GDB never (currently) generates any of these ops. */ |
1314 | case gdb_agent_op_float: | |
1315 | case gdb_agent_op_ref_float: | |
1316 | case gdb_agent_op_ref_double: | |
1317 | case gdb_agent_op_ref_long_double: | |
1318 | case gdb_agent_op_l_to_d: | |
1319 | case gdb_agent_op_d_to_l: | |
1320 | case gdb_agent_op_trace16: | |
1321 | ax_debug ("Agent expression op 0x%x valid, but not handled", | |
1322 | op); | |
1323 | /* If ever GDB generates any of these, we don't have the | |
1324 | option of ignoring. */ | |
1325 | return 1; | |
1326 | ||
1327 | default: | |
1328 | ax_debug ("Agent expression op 0x%x not recognized", op); | |
1329 | /* Don't struggle on, things will just get worse. */ | |
1330 | return expr_eval_unrecognized_opcode; | |
1331 | } | |
1332 | ||
1333 | /* Check for stack badness. */ | |
1334 | if (sp >= (STACK_MAX - 1)) | |
1335 | { | |
1336 | ax_debug ("Expression stack overflow"); | |
1337 | return expr_eval_stack_overflow; | |
1338 | } | |
1339 | ||
1340 | if (sp < 0) | |
1341 | { | |
1342 | ax_debug ("Expression stack underflow"); | |
1343 | return expr_eval_stack_underflow; | |
1344 | } | |
1345 | ||
1346 | ax_debug ("Op %s -> sp=%d, top=0x%s", | |
d38bbb0a | 1347 | gdb_agent_op_name (op), sp, phex_nz (top, 0)); |
9f14eebc LM |
1348 | } |
1349 | } |