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bd30e45a ME |
1 | /* Simulator for Xilinx MicroBlaze processor |
2 | Copyright 2009 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GDB, the GNU debugger. | |
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 2 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, write to the Free Software | |
18 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA | |
19 | 02110-1301, USA. */ | |
20 | ||
21 | #include <signal.h> | |
22 | #include "sysdep.h" | |
23 | #include <sys/times.h> | |
24 | #include <sys/param.h> | |
25 | #include <netinet/in.h> /* for byte ordering macros */ | |
26 | #include "bfd.h" | |
27 | #include "gdb/callback.h" | |
28 | #include "libiberty.h" | |
29 | #include "gdb/remote-sim.h" | |
30 | #include "sim-main.h" | |
31 | #include "sim-utils.h" | |
419c2fda | 32 | #include "microblaze-dis.h" |
bd30e45a ME |
33 | |
34 | ||
35 | #ifndef NUM_ELEM | |
36 | #define NUM_ELEM(A) (sizeof (A) / sizeof (A)[0]) | |
37 | #endif | |
38 | ||
39 | static int target_big_endian = 1; | |
40 | static unsigned long heap_ptr = 0; | |
41 | static unsigned long stack_ptr = 0; | |
42 | host_callback *callback; | |
43 | ||
44 | unsigned long | |
45 | microblaze_extract_unsigned_integer (unsigned char *addr, int len) | |
46 | { | |
47 | unsigned long retval; | |
48 | unsigned char *p; | |
49 | unsigned char *startaddr = (unsigned char *)addr; | |
50 | unsigned char *endaddr = startaddr + len; | |
51 | ||
52 | if (len > (int) sizeof (unsigned long)) | |
53 | printf ("That operation is not available on integers of more than " | |
54 | "%d bytes.", sizeof (unsigned long)); | |
55 | ||
56 | /* Start at the most significant end of the integer, and work towards | |
57 | the least significant. */ | |
58 | retval = 0; | |
59 | ||
60 | if (!target_big_endian) | |
61 | { | |
62 | for (p = endaddr; p > startaddr;) | |
63 | retval = (retval << 8) | * -- p; | |
64 | } | |
65 | else | |
66 | { | |
67 | for (p = startaddr; p < endaddr;) | |
68 | retval = (retval << 8) | * p ++; | |
69 | } | |
70 | ||
71 | return retval; | |
72 | } | |
73 | ||
74 | void | |
75 | microblaze_store_unsigned_integer (unsigned char *addr, int len, | |
76 | unsigned long val) | |
77 | { | |
78 | unsigned char *p; | |
79 | unsigned char *startaddr = (unsigned char *)addr; | |
80 | unsigned char *endaddr = startaddr + len; | |
81 | ||
82 | if (!target_big_endian) | |
83 | { | |
84 | for (p = startaddr; p < endaddr;) | |
85 | { | |
86 | *p++ = val & 0xff; | |
87 | val >>= 8; | |
88 | } | |
89 | } | |
90 | else | |
91 | { | |
92 | for (p = endaddr; p > startaddr;) | |
93 | { | |
94 | *--p = val & 0xff; | |
95 | val >>= 8; | |
96 | } | |
97 | } | |
98 | } | |
99 | ||
100 | struct sim_state microblaze_state; | |
101 | ||
102 | int memcycles = 1; | |
103 | ||
104 | static SIM_OPEN_KIND sim_kind; | |
105 | static char *myname; | |
106 | ||
107 | static int issue_messages = 0; | |
108 | ||
109 | long | |
110 | int_sbrk (int inc_bytes) | |
111 | { | |
112 | long addr; | |
113 | ||
114 | addr = heap_ptr; | |
115 | ||
116 | heap_ptr += inc_bytes; | |
117 | ||
118 | if (issue_messages && heap_ptr > SP) | |
119 | fprintf (stderr, "Warning: heap_ptr overlaps stack!\n"); | |
120 | ||
121 | return addr; | |
122 | } | |
123 | ||
124 | static void /* INLINE */ | |
125 | wbat (word x, word v) | |
126 | { | |
127 | if (((uword)x) >= CPU.msize) | |
128 | { | |
129 | if (issue_messages) | |
130 | fprintf (stderr, "byte write to 0x%x outside memory range\n", x); | |
131 | ||
132 | CPU.exception = SIGSEGV; | |
133 | } | |
134 | else | |
135 | { | |
136 | unsigned char *p = CPU.memory + x; | |
137 | p[0] = v; | |
138 | } | |
139 | } | |
140 | ||
141 | static void /* INLINE */ | |
142 | wlat (word x, word v) | |
143 | { | |
144 | if (((uword)x) >= CPU.msize) | |
145 | { | |
146 | if (issue_messages) | |
147 | fprintf (stderr, "word write to 0x%x outside memory range\n", x); | |
148 | ||
149 | CPU.exception = SIGSEGV; | |
150 | } | |
151 | else | |
152 | { | |
153 | if ((x & 3) != 0) | |
154 | { | |
155 | if (issue_messages) | |
156 | fprintf (stderr, "word write to unaligned memory address: 0x%x\n", x); | |
157 | ||
158 | CPU.exception = SIGBUS; | |
159 | } | |
160 | else if (!target_big_endian) | |
161 | { | |
162 | unsigned char *p = CPU.memory + x; | |
163 | p[3] = v >> 24; | |
164 | p[2] = v >> 16; | |
165 | p[1] = v >> 8; | |
166 | p[0] = v; | |
167 | } | |
168 | else | |
169 | { | |
170 | unsigned char *p = CPU.memory + x; | |
171 | p[0] = v >> 24; | |
172 | p[1] = v >> 16; | |
173 | p[2] = v >> 8; | |
174 | p[3] = v; | |
175 | } | |
176 | } | |
177 | } | |
178 | ||
179 | static void /* INLINE */ | |
180 | what (word x, word v) | |
181 | { | |
182 | if (((uword)x) >= CPU.msize) | |
183 | { | |
184 | if (issue_messages) | |
185 | fprintf (stderr, "short write to 0x%x outside memory range\n", x); | |
186 | ||
187 | CPU.exception = SIGSEGV; | |
188 | } | |
189 | else | |
190 | { | |
191 | if ((x & 1) != 0) | |
192 | { | |
193 | if (issue_messages) | |
194 | fprintf (stderr, "short write to unaligned memory address: 0x%x\n", | |
195 | x); | |
196 | ||
197 | CPU.exception = SIGBUS; | |
198 | } | |
199 | else if (!target_big_endian) | |
200 | { | |
201 | unsigned char *p = CPU.memory + x; | |
202 | p[1] = v >> 8; | |
203 | p[0] = v; | |
204 | } | |
205 | else | |
206 | { | |
207 | unsigned char *p = CPU.memory + x; | |
208 | p[0] = v >> 8; | |
209 | p[1] = v; | |
210 | } | |
211 | } | |
212 | } | |
213 | ||
214 | /* Read functions. */ | |
215 | static int /* INLINE */ | |
216 | rbat (word x) | |
217 | { | |
218 | if (((uword)x) >= CPU.msize) | |
219 | { | |
220 | if (issue_messages) | |
221 | fprintf (stderr, "byte read from 0x%x outside memory range\n", x); | |
222 | ||
223 | CPU.exception = SIGSEGV; | |
224 | return 0; | |
225 | } | |
226 | else | |
227 | { | |
228 | unsigned char *p = CPU.memory + x; | |
229 | return p[0]; | |
230 | } | |
231 | } | |
232 | ||
233 | static int /* INLINE */ | |
234 | rlat (word x) | |
235 | { | |
236 | if (((uword) x) >= CPU.msize) | |
237 | { | |
238 | if (issue_messages) | |
239 | fprintf (stderr, "word read from 0x%x outside memory range\n", x); | |
240 | ||
241 | CPU.exception = SIGSEGV; | |
242 | return 0; | |
243 | } | |
244 | else | |
245 | { | |
246 | if ((x & 3) != 0) | |
247 | { | |
248 | if (issue_messages) | |
249 | fprintf (stderr, "word read from unaligned address: 0x%x\n", x); | |
250 | ||
251 | CPU.exception = SIGBUS; | |
252 | return 0; | |
253 | } | |
254 | else if (! target_big_endian) | |
255 | { | |
256 | unsigned char *p = CPU.memory + x; | |
257 | return (p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]; | |
258 | } | |
259 | else | |
260 | { | |
261 | unsigned char *p = CPU.memory + x; | |
262 | return (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]; | |
263 | } | |
264 | } | |
265 | } | |
266 | ||
267 | static int /* INLINE */ | |
268 | rhat (word x) | |
269 | { | |
270 | if (((uword)x) >= CPU.msize) | |
271 | { | |
272 | if (issue_messages) | |
273 | fprintf (stderr, "short read from 0x%x outside memory range\n", x); | |
274 | ||
275 | CPU.exception = SIGSEGV; | |
276 | return 0; | |
277 | } | |
278 | else | |
279 | { | |
280 | if ((x & 1) != 0) | |
281 | { | |
282 | if (issue_messages) | |
283 | fprintf (stderr, "short read from unaligned address: 0x%x\n", x); | |
284 | ||
285 | CPU.exception = SIGBUS; | |
286 | return 0; | |
287 | } | |
288 | else if (!target_big_endian) | |
289 | { | |
290 | unsigned char *p = CPU.memory + x; | |
291 | return (p[1] << 8) | p[0]; | |
292 | } | |
293 | else | |
294 | { | |
295 | unsigned char *p = CPU.memory + x; | |
296 | return (p[0] << 8) | p[1]; | |
297 | } | |
298 | } | |
299 | } | |
300 | ||
301 | ||
302 | #define SEXTB(x) (((x & 0xff) ^ (~ 0x7f)) + 0x80) | |
303 | #define SEXTW(y) ((int)((short)y)) | |
304 | ||
305 | static int | |
306 | IOMEM (int addr, int write, int value) | |
307 | { | |
308 | } | |
309 | ||
310 | /* Default to a 8 Mbyte (== 2^23) memory space. */ | |
311 | static int sim_memory_size = 1 << 23; | |
312 | ||
313 | #define MEM_SIZE_FLOOR 64 | |
314 | void | |
315 | sim_size (int size) | |
316 | { | |
317 | sim_memory_size = size; | |
318 | CPU.msize = sim_memory_size; | |
319 | ||
320 | if (CPU.memory) | |
321 | free (CPU.memory); | |
322 | ||
323 | CPU.memory = (unsigned char *) calloc (1, CPU.msize); | |
324 | ||
325 | if (!CPU.memory) | |
326 | { | |
327 | if (issue_messages) | |
328 | fprintf (stderr, | |
329 | "Not enough VM for simulation of %d bytes of RAM\n", | |
330 | CPU.msize); | |
331 | ||
332 | CPU.msize = 1; | |
333 | CPU.memory = (unsigned char *) calloc (1, 1); | |
334 | } | |
335 | } | |
336 | ||
337 | static void | |
338 | init_pointers () | |
339 | { | |
340 | if (CPU.msize != (sim_memory_size)) | |
341 | sim_size (sim_memory_size); | |
342 | } | |
343 | ||
344 | static void | |
345 | set_initial_gprs () | |
346 | { | |
347 | int i; | |
348 | long space; | |
349 | unsigned long memsize; | |
350 | ||
351 | init_pointers (); | |
352 | ||
353 | /* Set up machine just out of reset. */ | |
354 | PC = 0; | |
355 | MSR = 0; | |
356 | ||
357 | memsize = CPU.msize / (1024 * 1024); | |
358 | ||
359 | if (issue_messages > 1) | |
360 | fprintf (stderr, "Simulated memory of %d Mbytes (0x0 .. 0x%08x)\n", | |
361 | memsize, CPU.msize - 1); | |
362 | ||
363 | /* Clean out the GPRs */ | |
364 | for (i = 0; i < 32; i++) | |
365 | CPU.regs[i] = 0; | |
366 | CPU.insts = 0; | |
367 | CPU.cycles = 0; | |
368 | CPU.imm_enable = 0; | |
369 | ||
370 | } | |
371 | ||
372 | static void | |
373 | interrupt () | |
374 | { | |
375 | CPU.exception = SIGINT; | |
376 | } | |
377 | ||
378 | /* Functions so that trapped open/close don't interfere with the | |
379 | parent's functions. We say that we can't close the descriptors | |
380 | that we didn't open. exit() and cleanup() get in trouble here, | |
381 | to some extent. That's the price of emulation. */ | |
382 | ||
383 | unsigned char opened[100]; | |
384 | ||
385 | static void | |
386 | log_open (int fd) | |
387 | { | |
388 | if (fd < 0 || fd > NUM_ELEM (opened)) | |
389 | return; | |
390 | ||
391 | opened[fd] = 1; | |
392 | } | |
393 | ||
394 | static void | |
395 | log_close (int fd) | |
396 | { | |
397 | if (fd < 0 || fd > NUM_ELEM (opened)) | |
398 | return; | |
399 | ||
400 | opened[fd] = 0; | |
401 | } | |
402 | ||
403 | static int | |
404 | is_opened (int fd) | |
405 | { | |
406 | if (fd < 0 || fd > NUM_ELEM (opened)) | |
407 | return 0; | |
408 | ||
409 | return opened[fd]; | |
410 | } | |
411 | ||
412 | static void | |
413 | handle_trap1 () | |
414 | { | |
415 | } | |
416 | ||
417 | static void | |
418 | process_stub (int what) | |
419 | { | |
420 | /* These values should match those in libgloss/microblaze/syscalls.s. */ | |
421 | switch (what) | |
422 | { | |
423 | case 3: /* _read */ | |
424 | case 4: /* _write */ | |
425 | case 5: /* _open */ | |
426 | case 6: /* _close */ | |
427 | case 10: /* _unlink */ | |
428 | case 19: /* _lseek */ | |
429 | case 43: /* _times */ | |
430 | handle_trap1 (); | |
431 | break; | |
432 | ||
433 | default: | |
434 | if (issue_messages) | |
435 | fprintf (stderr, "Unhandled stub opcode: %d\n", what); | |
436 | break; | |
437 | } | |
438 | } | |
439 | ||
440 | static void | |
441 | util (unsigned what) | |
442 | { | |
443 | switch (what) | |
444 | { | |
445 | case 0: /* exit */ | |
446 | CPU.exception = SIGQUIT; | |
447 | break; | |
448 | ||
449 | case 1: /* printf */ | |
450 | { | |
451 | unsigned long a[6]; | |
452 | unsigned char *s; | |
453 | int i; | |
454 | ||
455 | for (s = (unsigned char *)a[0], i = 1 ; *s && i < 6 ; s++) | |
456 | if (*s == '%') | |
457 | i++; | |
458 | } | |
459 | break; | |
460 | ||
461 | case 2: /* scanf */ | |
462 | if (issue_messages) | |
463 | fprintf (stderr, "WARNING: scanf unimplemented\n"); | |
464 | break; | |
465 | ||
466 | case 3: /* utime */ | |
467 | break; | |
468 | ||
469 | case 0xFF: | |
470 | process_stub (CPU.regs[1]); | |
471 | break; | |
472 | ||
473 | default: | |
474 | if (issue_messages) | |
475 | fprintf (stderr, "Unhandled util code: %x\n", what); | |
476 | break; | |
477 | } | |
478 | } | |
479 | ||
480 | /* For figuring out whether we carried; addc/subc use this. */ | |
481 | static int | |
482 | iu_carry (unsigned long a, unsigned long b, int cin) | |
483 | { | |
484 | unsigned long x; | |
485 | ||
486 | x = (a & 0xffff) + (b & 0xffff) + cin; | |
487 | x = (x >> 16) + (a >> 16) + (b >> 16); | |
488 | x >>= 16; | |
489 | ||
490 | return (x != 0); | |
491 | } | |
492 | ||
493 | #define WATCHFUNCTIONS 1 | |
494 | #ifdef WATCHFUNCTIONS | |
495 | ||
496 | #define MAXWL 80 | |
497 | word WL[MAXWL]; | |
498 | char *WLstr[MAXWL]; | |
499 | ||
500 | int ENDWL=0; | |
501 | int WLincyc; | |
502 | int WLcyc[MAXWL]; | |
503 | int WLcnts[MAXWL]; | |
504 | int WLmax[MAXWL]; | |
505 | int WLmin[MAXWL]; | |
506 | word WLendpc; | |
507 | int WLbcyc; | |
508 | int WLW; | |
509 | #endif | |
510 | ||
511 | static int tracing = 0; | |
512 | ||
513 | void | |
514 | sim_resume (SIM_DESC sd, int step, int siggnal) | |
515 | { | |
516 | int needfetch; | |
517 | word inst; | |
518 | enum microblaze_instr op; | |
519 | void (*sigsave)(); | |
520 | int memops; | |
521 | int bonus_cycles; | |
522 | int insts; | |
523 | int w; | |
524 | int cycs; | |
525 | word WLhash; | |
526 | ubyte carry; | |
527 | int imm_unsigned; | |
528 | short ra, rb, rd; | |
529 | long immword; | |
530 | uword oldpc, newpc; | |
531 | short delay_slot_enable; | |
532 | short branch_taken; | |
533 | short num_delay_slot; /* UNUSED except as reqd parameter */ | |
534 | enum microblaze_instr_type insn_type; | |
535 | ||
536 | sigsave = signal (SIGINT, interrupt); | |
537 | CPU.exception = step ? SIGTRAP : 0; | |
538 | ||
539 | memops = 0; | |
540 | bonus_cycles = 0; | |
541 | insts = 0; | |
542 | ||
543 | do | |
544 | { | |
545 | /* Fetch the initial instructions that we'll decode. */ | |
546 | inst = rlat (PC & 0xFFFFFFFC); | |
547 | ||
548 | op = get_insn_microblaze (inst, &imm_unsigned, &insn_type, | |
549 | &num_delay_slot); | |
550 | ||
551 | if (op == invalid_inst) | |
552 | fprintf (stderr, "Unknown instruction 0x%04x", inst); | |
553 | ||
554 | if (tracing) | |
555 | fprintf (stderr, "%.4x: inst = %.4x ", PC, inst); | |
556 | ||
557 | rd = GET_RD; | |
558 | rb = GET_RB; | |
559 | ra = GET_RA; | |
560 | /* immword = IMM_W; */ | |
561 | ||
562 | oldpc = PC; | |
563 | delay_slot_enable = 0; | |
564 | branch_taken = 0; | |
565 | if (op == microblaze_brk) | |
566 | CPU.exception = SIGTRAP; | |
567 | else if (inst == MICROBLAZE_HALT_INST) | |
568 | { | |
569 | CPU.exception = SIGQUIT; | |
570 | insts += 1; | |
571 | bonus_cycles++; | |
572 | } | |
573 | else | |
574 | { | |
575 | switch(op) | |
576 | { | |
577 | #define INSTRUCTION(NAME, OPCODE, TYPE, ACTION) \ | |
578 | case NAME: \ | |
579 | ACTION; \ | |
580 | break; | |
581 | #include "microblaze.isa" | |
582 | #undef INSTRUCTION | |
583 | ||
584 | default: | |
585 | CPU.exception = SIGILL; | |
586 | fprintf (stderr, "ERROR: Unknown opcode\n"); | |
587 | } | |
588 | /* Make R0 consistent */ | |
589 | CPU.regs[0] = 0; | |
590 | ||
591 | /* Check for imm instr */ | |
592 | if (op == imm) | |
593 | IMM_ENABLE = 1; | |
594 | else | |
595 | IMM_ENABLE = 0; | |
596 | ||
597 | /* Update cycle counts */ | |
598 | insts ++; | |
599 | if (insn_type == memory_store_inst || insn_type == memory_load_inst) | |
600 | memops++; | |
601 | if (insn_type == mult_inst) | |
602 | bonus_cycles++; | |
603 | if (insn_type == barrel_shift_inst) | |
604 | bonus_cycles++; | |
605 | if (insn_type == anyware_inst) | |
606 | bonus_cycles++; | |
607 | if (insn_type == div_inst) | |
608 | bonus_cycles += 33; | |
609 | ||
610 | if ((insn_type == branch_inst || insn_type == return_inst) | |
611 | && branch_taken) | |
612 | { | |
613 | /* Add an extra cycle for taken branches */ | |
614 | bonus_cycles++; | |
615 | /* For branch instructions handle the instruction in the delay slot */ | |
616 | if (delay_slot_enable) | |
617 | { | |
618 | newpc = PC; | |
619 | PC = oldpc + INST_SIZE; | |
620 | inst = rlat (PC & 0xFFFFFFFC); | |
621 | op = get_insn_microblaze (inst, &imm_unsigned, &insn_type, | |
622 | &num_delay_slot); | |
623 | if (op == invalid_inst) | |
624 | fprintf (stderr, "Unknown instruction 0x%04x", inst); | |
625 | if (tracing) | |
626 | fprintf (stderr, "%.4x: inst = %.4x ", PC, inst); | |
627 | rd = GET_RD; | |
628 | rb = GET_RB; | |
629 | ra = GET_RA; | |
630 | /* immword = IMM_W; */ | |
631 | if (op == microblaze_brk) | |
632 | { | |
633 | if (issue_messages) | |
634 | fprintf (stderr, "Breakpoint set in delay slot " | |
635 | "(at address 0x%x) will not be honored\n", PC); | |
636 | /* ignore the breakpoint */ | |
637 | } | |
638 | else if (insn_type == branch_inst || insn_type == return_inst) | |
639 | { | |
640 | if (issue_messages) | |
641 | fprintf (stderr, "Cannot have branch or return instructions " | |
642 | "in delay slot (at address 0x%x)\n", PC); | |
643 | CPU.exception = SIGILL; | |
644 | } | |
645 | else | |
646 | { | |
647 | switch(op) | |
648 | { | |
649 | #define INSTRUCTION(NAME, OPCODE, TYPE, ACTION) \ | |
650 | case NAME: \ | |
651 | ACTION; \ | |
652 | break; | |
653 | #include "microblaze.isa" | |
654 | #undef INSTRUCTION | |
655 | ||
656 | default: | |
657 | CPU.exception = SIGILL; | |
658 | fprintf (stderr, "ERROR: Unknown opcode at 0x%x\n", PC); | |
659 | } | |
660 | /* Update cycle counts */ | |
661 | insts++; | |
662 | if (insn_type == memory_store_inst | |
663 | || insn_type == memory_load_inst) | |
664 | memops++; | |
665 | if (insn_type == mult_inst) | |
666 | bonus_cycles++; | |
667 | if (insn_type == barrel_shift_inst) | |
668 | bonus_cycles++; | |
669 | if (insn_type == anyware_inst) | |
670 | bonus_cycles++; | |
671 | if (insn_type == div_inst) | |
672 | bonus_cycles += 33; | |
673 | } | |
674 | /* Restore the PC */ | |
675 | PC = newpc; | |
676 | /* Make R0 consistent */ | |
677 | CPU.regs[0] = 0; | |
678 | /* Check for imm instr */ | |
679 | if (op == imm) | |
680 | IMM_ENABLE = 1; | |
681 | else | |
682 | IMM_ENABLE = 0; | |
683 | } | |
684 | else | |
685 | /* no delay slot: increment cycle count */ | |
686 | bonus_cycles++; | |
687 | } | |
688 | } | |
689 | ||
690 | if (tracing) | |
691 | fprintf (stderr, "\n"); | |
692 | } | |
693 | while (!CPU.exception); | |
694 | ||
695 | /* Hide away the things we've cached while executing. */ | |
696 | /* CPU.pc = pc; */ | |
697 | CPU.insts += insts; /* instructions done ... */ | |
698 | CPU.cycles += insts; /* and each takes a cycle */ | |
699 | CPU.cycles += bonus_cycles; /* and extra cycles for branches */ | |
700 | CPU.cycles += memops; /* and memop cycle delays */ | |
701 | ||
702 | signal (SIGINT, sigsave); | |
703 | } | |
704 | ||
705 | ||
706 | int | |
707 | sim_write (SIM_DESC sd, SIM_ADDR addr, unsigned char *buffer, int size) | |
708 | { | |
709 | int i; | |
710 | init_pointers (); | |
711 | ||
712 | memcpy (&CPU.memory[addr], buffer, size); | |
713 | ||
714 | return size; | |
715 | } | |
716 | ||
717 | int | |
718 | sim_read (SIM_DESC sd, SIM_ADDR addr, unsigned char *buffer, int size) | |
719 | { | |
720 | int i; | |
721 | init_pointers (); | |
722 | ||
723 | memcpy (buffer, &CPU.memory[addr], size); | |
724 | ||
725 | return size; | |
726 | } | |
727 | ||
728 | ||
729 | int | |
730 | sim_store_register (SIM_DESC sd, int rn, unsigned char *memory, int length) | |
731 | { | |
732 | init_pointers (); | |
733 | ||
734 | if (rn < NUM_REGS + NUM_SPECIAL && rn >= 0) | |
735 | { | |
736 | if (length == 4) | |
737 | { | |
738 | /* misalignment safe */ | |
739 | long ival = microblaze_extract_unsigned_integer (memory, 4); | |
740 | if (rn < NUM_REGS) | |
741 | CPU.regs[rn] = ival; | |
742 | else | |
743 | CPU.spregs[rn-NUM_REGS] = ival; | |
744 | return 4; | |
745 | } | |
746 | else | |
747 | return 0; | |
748 | } | |
749 | else | |
750 | return 0; | |
751 | } | |
752 | ||
753 | int | |
754 | sim_fetch_register (SIM_DESC sd, int rn, unsigned char *memory, int length) | |
755 | { | |
756 | long ival; | |
757 | init_pointers (); | |
758 | ||
759 | if (rn < NUM_REGS + NUM_SPECIAL && rn >= 0) | |
760 | { | |
761 | if (length == 4) | |
762 | { | |
763 | if (rn < NUM_REGS) | |
764 | ival = CPU.regs[rn]; | |
765 | else | |
766 | ival = CPU.spregs[rn-NUM_REGS]; | |
767 | ||
768 | /* misalignment-safe */ | |
769 | microblaze_store_unsigned_integer (memory, 4, ival); | |
770 | return 4; | |
771 | } | |
772 | else | |
773 | return 0; | |
774 | } | |
775 | else | |
776 | return 0; | |
777 | } | |
778 | ||
779 | ||
780 | int | |
781 | sim_trace (SIM_DESC sd) | |
782 | { | |
783 | tracing = 1; | |
784 | ||
785 | sim_resume (sd, 0, 0); | |
786 | ||
787 | tracing = 0; | |
788 | ||
789 | return 1; | |
790 | } | |
791 | ||
792 | void | |
793 | sim_stop_reason (SIM_DESC sd, enum sim_stop *reason, int *sigrc) | |
794 | { | |
795 | if (CPU.exception == SIGQUIT) | |
796 | { | |
797 | *reason = sim_exited; | |
798 | *sigrc = RETREG; | |
799 | } | |
800 | else | |
801 | { | |
802 | *reason = sim_stopped; | |
803 | *sigrc = CPU.exception; | |
804 | } | |
805 | } | |
806 | ||
807 | ||
808 | int | |
809 | sim_stop (SIM_DESC sd) | |
810 | { | |
811 | CPU.exception = SIGINT; | |
812 | return 1; | |
813 | } | |
814 | ||
815 | ||
816 | void | |
817 | sim_info (SIM_DESC sd, int verbose) | |
818 | { | |
819 | #ifdef WATCHFUNCTIONS | |
820 | int w, wcyc; | |
821 | #endif | |
822 | ||
823 | callback->printf_filtered (callback, "\n\n# instructions executed %10d\n", | |
824 | CPU.insts); | |
825 | callback->printf_filtered (callback, "# cycles %10d\n", | |
826 | (CPU.cycles) ? CPU.cycles+2 : 0); | |
827 | ||
828 | #ifdef WATCHFUNCTIONS | |
829 | callback->printf_filtered (callback, "\nNumber of watched functions: %d\n", | |
830 | ENDWL); | |
831 | ||
832 | wcyc = 0; | |
833 | ||
834 | for (w = 1; w <= ENDWL; w++) | |
835 | { | |
836 | callback->printf_filtered (callback, "WL = %s %8x\n",WLstr[w],WL[w]); | |
837 | callback->printf_filtered (callback, " calls = %d, cycles = %d\n", | |
838 | WLcnts[w],WLcyc[w]); | |
839 | ||
840 | if (WLcnts[w] != 0) | |
841 | callback->printf_filtered (callback, | |
842 | " maxcpc = %d, mincpc = %d, avecpc = %d\n", | |
843 | WLmax[w],WLmin[w],WLcyc[w]/WLcnts[w]); | |
844 | wcyc += WLcyc[w]; | |
845 | } | |
846 | ||
847 | callback->printf_filtered (callback, | |
848 | "Total cycles for watched functions: %d\n",wcyc); | |
849 | #endif | |
850 | } | |
851 | ||
852 | struct aout | |
853 | { | |
854 | unsigned char sa_machtype[2]; | |
855 | unsigned char sa_magic[2]; | |
856 | unsigned char sa_tsize[4]; | |
857 | unsigned char sa_dsize[4]; | |
858 | unsigned char sa_bsize[4]; | |
859 | unsigned char sa_syms[4]; | |
860 | unsigned char sa_entry[4]; | |
861 | unsigned char sa_trelo[4]; | |
862 | unsigned char sa_drelo[4]; | |
863 | } aout; | |
864 | ||
865 | #define LONG(x) (((x)[0]<<24)|((x)[1]<<16)|((x)[2]<<8)|(x)[3]) | |
866 | #define SHORT(x) (((x)[0]<<8)|(x)[1]) | |
867 | ||
868 | SIM_DESC | |
869 | sim_open (SIM_OPEN_KIND kind, host_callback *cb, struct bfd *abfd, char **argv) | |
870 | { | |
871 | /* SIM_DESC sd = sim_state_alloc(kind, alloc);*/ | |
872 | ||
873 | int osize = sim_memory_size; | |
874 | myname = argv[0]; | |
875 | callback = cb; | |
876 | ||
877 | if (kind == SIM_OPEN_STANDALONE) | |
878 | issue_messages = 1; | |
879 | ||
880 | /* Discard and reacquire memory -- start with a clean slate. */ | |
881 | sim_size (1); /* small */ | |
882 | sim_size (osize); /* and back again */ | |
883 | ||
884 | set_initial_gprs (); /* Reset the GPR registers. */ | |
885 | ||
886 | return ((SIM_DESC) 1); | |
887 | } | |
888 | ||
889 | void | |
890 | sim_close (SIM_DESC sd, int quitting) | |
891 | { | |
892 | if (CPU.memory) | |
893 | { | |
894 | free(CPU.memory); | |
895 | CPU.memory = NULL; | |
896 | CPU.msize = 0; | |
897 | } | |
898 | } | |
899 | ||
900 | SIM_RC | |
901 | sim_load (SIM_DESC sd, char *prog, bfd *abfd, int from_tty) | |
902 | { | |
903 | /* Do the right thing for ELF executables; this turns out to be | |
904 | just about the right thing for any object format that: | |
905 | - we crack using BFD routines | |
906 | - follows the traditional UNIX text/data/bss layout | |
907 | - calls the bss section ".bss". */ | |
908 | ||
909 | extern bfd *sim_load_file (); /* ??? Don't know where this should live. */ | |
910 | bfd *prog_bfd; | |
911 | ||
912 | { | |
913 | bfd *handle; | |
914 | asection *s; | |
915 | int found_loadable_section = 0; | |
916 | bfd_vma max_addr = 0; | |
917 | handle = bfd_openr (prog, 0); | |
918 | ||
919 | if (!handle) | |
920 | { | |
921 | printf("``%s'' could not be opened.\n", prog); | |
922 | return SIM_RC_FAIL; | |
923 | } | |
924 | ||
925 | /* Makes sure that we have an object file, also cleans gets the | |
926 | section headers in place. */ | |
927 | if (!bfd_check_format (handle, bfd_object)) | |
928 | { | |
929 | /* wasn't an object file */ | |
930 | bfd_close (handle); | |
931 | printf ("``%s'' is not appropriate object file.\n", prog); | |
932 | return SIM_RC_FAIL; | |
933 | } | |
934 | ||
935 | for (s = handle->sections; s; s = s->next) | |
936 | { | |
937 | if (s->flags & SEC_ALLOC) | |
938 | { | |
939 | bfd_vma vma = 0; | |
940 | int size = bfd_get_section_size (s); | |
941 | if (size > 0) | |
942 | { | |
943 | vma = bfd_section_vma (handle, s); | |
944 | if (vma >= max_addr) | |
945 | { | |
946 | max_addr = vma + size; | |
947 | } | |
948 | } | |
949 | if (s->flags & SEC_LOAD) | |
950 | found_loadable_section = 1; | |
951 | } | |
952 | } | |
953 | ||
954 | if (!found_loadable_section) | |
955 | { | |
956 | /* No loadable sections */ | |
957 | bfd_close(handle); | |
958 | printf("No loadable sections in file %s\n", prog); | |
959 | return SIM_RC_FAIL; | |
960 | } | |
961 | ||
962 | sim_memory_size = (unsigned long) max_addr; | |
963 | ||
964 | /* Clean up after ourselves. */ | |
965 | bfd_close (handle); | |
966 | ||
967 | } | |
968 | ||
969 | /* from sh -- dac */ | |
970 | prog_bfd = sim_load_file (sd, myname, callback, prog, abfd, | |
971 | /* sim_kind == SIM_OPEN_DEBUG, */ | |
972 | 1, | |
973 | 0, sim_write); | |
974 | if (prog_bfd == NULL) | |
975 | return SIM_RC_FAIL; | |
976 | ||
977 | target_big_endian = bfd_big_endian (prog_bfd); | |
978 | PC = bfd_get_start_address (prog_bfd); | |
979 | ||
980 | if (abfd == NULL) | |
981 | bfd_close (prog_bfd); | |
982 | ||
983 | return SIM_RC_OK; | |
984 | } | |
985 | ||
986 | SIM_RC | |
987 | sim_create_inferior (SIM_DESC sd, struct bfd *prog_bfd, char **argv, char **env) | |
988 | { | |
989 | char **avp; | |
990 | int nargs = 0; | |
991 | int nenv = 0; | |
992 | int s_length; | |
993 | int l; | |
994 | unsigned long strings; | |
995 | unsigned long pointers; | |
996 | unsigned long hi_stack; | |
997 | ||
998 | ||
999 | /* Set the initial register set. */ | |
1000 | l = issue_messages; | |
1001 | issue_messages = 0; | |
1002 | set_initial_gprs (); | |
1003 | issue_messages = l; | |
1004 | ||
1005 | hi_stack = CPU.msize - 4; | |
1006 | PC = bfd_get_start_address (prog_bfd); | |
1007 | ||
1008 | /* For now ignore all parameters to the program */ | |
1009 | ||
1010 | return SIM_RC_OK; | |
1011 | } | |
1012 | ||
1013 | void | |
1014 | sim_kill (SIM_DESC sd) | |
1015 | { | |
1016 | /* nothing to do */ | |
1017 | } | |
1018 | ||
1019 | void | |
1020 | sim_do_command (SIM_DESC sd, char * cmd) | |
1021 | { | |
1022 | /* Nothing there yet; it's all an error. */ | |
1023 | ||
1024 | if (cmd != NULL) | |
1025 | { | |
1026 | char ** simargv = buildargv (cmd); | |
1027 | ||
1028 | if (strcmp (simargv[0], "watch") == 0) | |
1029 | { | |
1030 | if ((simargv[1] == NULL) || (simargv[2] == NULL)) | |
1031 | { | |
1032 | fprintf (stderr, "Error: missing argument to watch cmd.\n"); | |
1033 | return; | |
1034 | } | |
1035 | ||
1036 | ENDWL++; | |
1037 | ||
1038 | WL[ENDWL] = strtol (simargv[2], NULL, 0); | |
1039 | WLstr[ENDWL] = strdup (simargv[1]); | |
1040 | fprintf (stderr, "Added %s (%x) to watchlist, #%d\n",WLstr[ENDWL], | |
1041 | WL[ENDWL], ENDWL); | |
1042 | ||
1043 | } | |
1044 | else if (strcmp (simargv[0], "dumpmem") == 0) | |
1045 | { | |
1046 | unsigned char * p; | |
1047 | FILE * dumpfile; | |
1048 | ||
1049 | if (simargv[1] == NULL) | |
1050 | fprintf (stderr, "Error: missing argument to dumpmem cmd.\n"); | |
1051 | ||
1052 | fprintf (stderr, "Writing dumpfile %s...",simargv[1]); | |
1053 | ||
1054 | dumpfile = fopen (simargv[1], "w"); | |
1055 | p = CPU.memory; | |
1056 | fwrite (p, CPU.msize-1, 1, dumpfile); | |
1057 | fclose (dumpfile); | |
1058 | ||
1059 | fprintf (stderr, "done.\n"); | |
1060 | } | |
1061 | else if (strcmp (simargv[0], "clearstats") == 0) | |
1062 | { | |
1063 | CPU.cycles = 0; | |
1064 | CPU.insts = 0; | |
1065 | ENDWL = 0; | |
1066 | } | |
1067 | else if (strcmp (simargv[0], "verbose") == 0) | |
1068 | { | |
1069 | issue_messages = 2; | |
1070 | } | |
1071 | else | |
1072 | { | |
1073 | fprintf (stderr,"Error: \"%s\" is not a valid M.CORE simulator command.\n", | |
1074 | cmd); | |
1075 | } | |
1076 | } | |
1077 | else | |
1078 | { | |
1079 | fprintf (stderr, "M.CORE sim commands: \n"); | |
1080 | fprintf (stderr, " watch <funcname> <addr>\n"); | |
1081 | fprintf (stderr, " dumpmem <filename>\n"); | |
1082 | fprintf (stderr, " clearstats\n"); | |
1083 | fprintf (stderr, " verbose\n"); | |
1084 | } | |
1085 | } | |
1086 | ||
1087 | void | |
1088 | sim_set_callbacks (host_callback *ptr) | |
1089 | { | |
1090 | callback = ptr; | |
1091 | } |