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a13e2c95 | 1 | /* Low level interface to SPUs, for the remote server for GDB. |
6aba47ca | 2 | Copyright (C) 2006, 2007 Free Software Foundation, Inc. |
a13e2c95 UW |
3 | |
4 | Contributed by Ulrich Weigand <uweigand@de.ibm.com>. | |
5 | ||
6 | This file is part of GDB. | |
7 | ||
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. | |
12 | ||
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. | |
17 | ||
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., 51 Franklin Street, Fifth Floor, | |
21 | Boston, MA 02110-1301, USA. */ | |
22 | ||
23 | #include "server.h" | |
24 | ||
25 | #include <sys/wait.h> | |
26 | #include <stdio.h> | |
27 | #include <sys/ptrace.h> | |
28 | #include <fcntl.h> | |
29 | #include <string.h> | |
30 | #include <stdlib.h> | |
31 | #include <unistd.h> | |
32 | #include <errno.h> | |
33 | #include <sys/syscall.h> | |
34 | ||
35 | /* Some older glibc versions do not define this. */ | |
36 | #ifndef __WNOTHREAD | |
37 | #define __WNOTHREAD 0x20000000 /* Don't wait on children of other | |
38 | threads in this group */ | |
39 | #endif | |
40 | ||
41 | #define PTRACE_TYPE_RET long | |
42 | #define PTRACE_TYPE_ARG3 long | |
43 | ||
44 | /* Number of registers. */ | |
45 | #define SPU_NUM_REGS 130 | |
46 | #define SPU_NUM_CORE_REGS 128 | |
47 | ||
48 | /* Special registers. */ | |
49 | #define SPU_ID_REGNUM 128 | |
50 | #define SPU_PC_REGNUM 129 | |
51 | ||
52 | /* PPU side system calls. */ | |
53 | #define INSTR_SC 0x44000002 | |
54 | #define NR_spu_run 0x0116 | |
55 | ||
56 | /* Get current thread ID (Linux task ID). */ | |
57 | #define current_tid ((struct inferior_list_entry *)current_inferior)->id | |
58 | ||
59 | /* These are used in remote-utils.c. */ | |
60 | int using_threads = 0; | |
a13e2c95 UW |
61 | |
62 | ||
63 | /* Fetch PPU register REGNO. */ | |
64 | static CORE_ADDR | |
65 | fetch_ppc_register (int regno) | |
66 | { | |
67 | PTRACE_TYPE_RET res; | |
68 | ||
69 | int tid = current_tid; | |
70 | ||
71 | #ifndef __powerpc64__ | |
72 | /* If running as a 32-bit process on a 64-bit system, we attempt | |
73 | to get the full 64-bit register content of the target process. | |
74 | If the PPC special ptrace call fails, we're on a 32-bit system; | |
75 | just fall through to the regular ptrace call in that case. */ | |
76 | { | |
77 | char buf[8]; | |
78 | ||
79 | errno = 0; | |
80 | ptrace (PPC_PTRACE_PEEKUSR_3264, tid, | |
81 | (PTRACE_TYPE_ARG3) (regno * 8), buf); | |
82 | if (errno == 0) | |
83 | ptrace (PPC_PTRACE_PEEKUSR_3264, tid, | |
84 | (PTRACE_TYPE_ARG3) (regno * 8 + 4), buf + 4); | |
85 | if (errno == 0) | |
86 | return (CORE_ADDR) *(unsigned long long *)buf; | |
87 | } | |
88 | #endif | |
89 | ||
90 | errno = 0; | |
91 | res = ptrace (PT_READ_U, tid, | |
92 | (PTRACE_TYPE_ARG3) (regno * sizeof (PTRACE_TYPE_RET)), 0); | |
93 | if (errno != 0) | |
94 | { | |
95 | char mess[128]; | |
96 | sprintf (mess, "reading PPC register #%d", regno); | |
97 | perror_with_name (mess); | |
98 | } | |
99 | ||
100 | return (CORE_ADDR) (unsigned long) res; | |
101 | } | |
102 | ||
103 | /* Fetch WORD from PPU memory at (aligned) MEMADDR in thread TID. */ | |
104 | static int | |
105 | fetch_ppc_memory_1 (int tid, CORE_ADDR memaddr, PTRACE_TYPE_RET *word) | |
106 | { | |
107 | errno = 0; | |
108 | ||
109 | #ifndef __powerpc64__ | |
110 | if (memaddr >> 32) | |
111 | { | |
112 | unsigned long long addr_8 = (unsigned long long) memaddr; | |
113 | ptrace (PPC_PTRACE_PEEKTEXT_3264, tid, (PTRACE_TYPE_ARG3) &addr_8, word); | |
114 | } | |
115 | else | |
116 | #endif | |
117 | *word = ptrace (PT_READ_I, tid, (PTRACE_TYPE_ARG3) (size_t) memaddr, 0); | |
118 | ||
119 | return errno; | |
120 | } | |
121 | ||
122 | /* Store WORD into PPU memory at (aligned) MEMADDR in thread TID. */ | |
123 | static int | |
124 | store_ppc_memory_1 (int tid, CORE_ADDR memaddr, PTRACE_TYPE_RET word) | |
125 | { | |
126 | errno = 0; | |
127 | ||
128 | #ifndef __powerpc64__ | |
129 | if (memaddr >> 32) | |
130 | { | |
131 | unsigned long long addr_8 = (unsigned long long) memaddr; | |
132 | ptrace (PPC_PTRACE_POKEDATA_3264, tid, (PTRACE_TYPE_ARG3) &addr_8, word); | |
133 | } | |
134 | else | |
135 | #endif | |
136 | ptrace (PT_WRITE_D, tid, (PTRACE_TYPE_ARG3) (size_t) memaddr, word); | |
137 | ||
138 | return errno; | |
139 | } | |
140 | ||
141 | /* Fetch LEN bytes of PPU memory at MEMADDR to MYADDR. */ | |
142 | static int | |
143 | fetch_ppc_memory (CORE_ADDR memaddr, char *myaddr, int len) | |
144 | { | |
145 | int i, ret; | |
146 | ||
147 | CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_TYPE_RET); | |
148 | int count = ((((memaddr + len) - addr) + sizeof (PTRACE_TYPE_RET) - 1) | |
149 | / sizeof (PTRACE_TYPE_RET)); | |
150 | PTRACE_TYPE_RET *buffer; | |
151 | ||
152 | int tid = current_tid; | |
153 | ||
154 | buffer = (PTRACE_TYPE_RET *) alloca (count * sizeof (PTRACE_TYPE_RET)); | |
155 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_TYPE_RET)) | |
156 | if ((ret = fetch_ppc_memory_1 (tid, addr, &buffer[i])) != 0) | |
157 | return ret; | |
158 | ||
159 | memcpy (myaddr, | |
160 | (char *) buffer + (memaddr & (sizeof (PTRACE_TYPE_RET) - 1)), | |
161 | len); | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
166 | /* Store LEN bytes from MYADDR to PPU memory at MEMADDR. */ | |
167 | static int | |
168 | store_ppc_memory (CORE_ADDR memaddr, char *myaddr, int len) | |
169 | { | |
170 | int i, ret; | |
171 | ||
172 | CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_TYPE_RET); | |
173 | int count = ((((memaddr + len) - addr) + sizeof (PTRACE_TYPE_RET) - 1) | |
174 | / sizeof (PTRACE_TYPE_RET)); | |
175 | PTRACE_TYPE_RET *buffer; | |
176 | ||
177 | int tid = current_tid; | |
178 | ||
179 | buffer = (PTRACE_TYPE_RET *) alloca (count * sizeof (PTRACE_TYPE_RET)); | |
180 | ||
181 | if (addr != memaddr || len < (int) sizeof (PTRACE_TYPE_RET)) | |
182 | if ((ret = fetch_ppc_memory_1 (tid, addr, &buffer[0])) != 0) | |
183 | return ret; | |
184 | ||
185 | if (count > 1) | |
186 | if ((ret = fetch_ppc_memory_1 (tid, addr + (count - 1) | |
187 | * sizeof (PTRACE_TYPE_RET), | |
188 | &buffer[count - 1])) != 0) | |
189 | return ret; | |
190 | ||
191 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_TYPE_RET) - 1)), | |
192 | myaddr, len); | |
193 | ||
194 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_TYPE_RET)) | |
195 | if ((ret = store_ppc_memory_1 (tid, addr, buffer[i])) != 0) | |
196 | return ret; | |
197 | ||
198 | return 0; | |
199 | } | |
200 | ||
201 | ||
202 | /* If the PPU thread is currently stopped on a spu_run system call, | |
203 | return to FD and ADDR the file handle and NPC parameter address | |
204 | used with the system call. Return non-zero if successful. */ | |
205 | static int | |
206 | parse_spufs_run (int *fd, CORE_ADDR *addr) | |
207 | { | |
208 | char buf[4]; | |
209 | CORE_ADDR pc = fetch_ppc_register (32); /* nip */ | |
210 | ||
211 | /* Fetch instruction preceding current NIP. */ | |
212 | if (fetch_ppc_memory (pc-4, buf, 4) != 0) | |
213 | return 0; | |
214 | /* It should be a "sc" instruction. */ | |
215 | if (*(unsigned int *)buf != INSTR_SC) | |
216 | return 0; | |
217 | /* System call number should be NR_spu_run. */ | |
218 | if (fetch_ppc_register (0) != NR_spu_run) | |
219 | return 0; | |
220 | ||
221 | /* Register 3 contains fd, register 4 the NPC param pointer. */ | |
222 | *fd = fetch_ppc_register (34); /* orig_gpr3 */ | |
223 | *addr = fetch_ppc_register (4); | |
224 | return 1; | |
225 | } | |
226 | ||
227 | ||
228 | /* Copy LEN bytes at OFFSET in spufs file ANNEX into/from READBUF or WRITEBUF, | |
229 | using the /proc file system. */ | |
230 | static int | |
231 | spu_proc_xfer_spu (const char *annex, unsigned char *readbuf, | |
232 | const unsigned char *writebuf, | |
233 | CORE_ADDR offset, int len) | |
234 | { | |
235 | char buf[128]; | |
236 | int fd = 0; | |
237 | int ret = -1; | |
238 | ||
239 | if (!annex) | |
240 | return 0; | |
241 | ||
242 | sprintf (buf, "/proc/%ld/fd/%s", current_tid, annex); | |
243 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
244 | if (fd <= 0) | |
245 | return -1; | |
246 | ||
247 | if (offset != 0 | |
248 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
249 | { | |
250 | close (fd); | |
251 | return -1; | |
252 | } | |
253 | ||
254 | if (writebuf) | |
255 | ret = write (fd, writebuf, (size_t) len); | |
256 | else if (readbuf) | |
257 | ret = read (fd, readbuf, (size_t) len); | |
258 | ||
259 | close (fd); | |
260 | return ret; | |
261 | } | |
262 | ||
263 | ||
264 | /* Start an inferior process and returns its pid. | |
265 | ALLARGS is a vector of program-name and args. */ | |
266 | static int | |
267 | spu_create_inferior (char *program, char **allargs) | |
268 | { | |
269 | int pid; | |
270 | ||
271 | pid = fork (); | |
272 | if (pid < 0) | |
273 | perror_with_name ("fork"); | |
274 | ||
275 | if (pid == 0) | |
276 | { | |
277 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
278 | ||
279 | setpgid (0, 0); | |
280 | ||
281 | execv (program, allargs); | |
282 | ||
283 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
284 | strerror (errno)); | |
285 | fflush (stderr); | |
286 | _exit (0177); | |
287 | } | |
288 | ||
289 | add_thread (pid, NULL, pid); | |
290 | return pid; | |
291 | } | |
292 | ||
293 | /* Attach to an inferior process. */ | |
294 | int | |
295 | spu_attach (unsigned long pid) | |
296 | { | |
297 | if (ptrace (PTRACE_ATTACH, pid, 0, 0) != 0) | |
298 | { | |
299 | fprintf (stderr, "Cannot attach to process %ld: %s (%d)\n", pid, | |
300 | strerror (errno), errno); | |
301 | fflush (stderr); | |
302 | _exit (0177); | |
303 | } | |
304 | ||
305 | add_thread (pid, NULL, pid); | |
306 | return 0; | |
307 | } | |
308 | ||
309 | /* Kill the inferior process. */ | |
310 | static void | |
311 | spu_kill (void) | |
312 | { | |
313 | ptrace (PTRACE_KILL, current_tid, 0, 0); | |
314 | } | |
315 | ||
316 | /* Detach from inferior process. */ | |
317 | static void | |
318 | spu_detach (void) | |
319 | { | |
320 | ptrace (PTRACE_DETACH, current_tid, 0, 0); | |
321 | } | |
322 | ||
323 | /* Return nonzero if the given thread is still alive. */ | |
324 | static int | |
325 | spu_thread_alive (unsigned long tid) | |
326 | { | |
327 | return tid == current_tid; | |
328 | } | |
329 | ||
330 | /* Resume process. */ | |
331 | static void | |
332 | spu_resume (struct thread_resume *resume_info) | |
333 | { | |
334 | while (resume_info->thread != -1 | |
335 | && resume_info->thread != current_tid) | |
336 | resume_info++; | |
337 | ||
338 | block_async_io (); | |
339 | enable_async_io (); | |
340 | ||
341 | if (resume_info->leave_stopped) | |
342 | return; | |
343 | ||
344 | /* We don't support hardware single-stepping right now, assume | |
345 | GDB knows to use software single-stepping. */ | |
346 | if (resume_info->step) | |
347 | fprintf (stderr, "Hardware single-step not supported.\n"); | |
348 | ||
349 | regcache_invalidate (); | |
350 | ||
351 | errno = 0; | |
352 | ptrace (PTRACE_CONT, current_tid, 0, resume_info->sig); | |
353 | if (errno) | |
354 | perror_with_name ("ptrace"); | |
355 | } | |
356 | ||
357 | /* Wait for process, returns status. */ | |
358 | static unsigned char | |
359 | spu_wait (char *status) | |
360 | { | |
361 | int tid = current_tid; | |
362 | int w; | |
363 | int ret; | |
364 | ||
365 | enable_async_io (); | |
366 | unblock_async_io (); | |
367 | ||
368 | while (1) | |
369 | { | |
370 | ret = waitpid (tid, &w, WNOHANG | __WALL | __WNOTHREAD); | |
371 | ||
372 | if (ret == -1) | |
373 | { | |
374 | if (errno != ECHILD) | |
375 | perror_with_name ("waitpid"); | |
376 | } | |
377 | else if (ret > 0) | |
378 | break; | |
379 | ||
380 | usleep (1000); | |
381 | } | |
382 | ||
383 | /* On the first wait, continue running the inferior until we are | |
384 | blocked inside an spu_run system call. */ | |
385 | if (!server_waiting) | |
386 | { | |
387 | int fd; | |
388 | CORE_ADDR addr; | |
389 | ||
390 | while (!parse_spufs_run (&fd, &addr)) | |
391 | { | |
392 | ptrace (PT_SYSCALL, tid, (PTRACE_TYPE_ARG3) 0, 0); | |
393 | waitpid (tid, NULL, __WALL | __WNOTHREAD); | |
394 | } | |
395 | } | |
396 | ||
397 | disable_async_io (); | |
398 | ||
399 | if (WIFEXITED (w)) | |
400 | { | |
401 | fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w)); | |
402 | *status = 'W'; | |
403 | clear_inferiors (); | |
404 | return ((unsigned char) WEXITSTATUS (w)); | |
405 | } | |
406 | else if (!WIFSTOPPED (w)) | |
407 | { | |
408 | fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w)); | |
409 | *status = 'X'; | |
410 | clear_inferiors (); | |
411 | return ((unsigned char) WTERMSIG (w)); | |
412 | } | |
413 | ||
414 | /* After attach, we may have received a SIGSTOP. Do not return this | |
415 | as signal to GDB, or else it will try to continue with SIGSTOP ... */ | |
416 | if (!server_waiting) | |
417 | { | |
418 | *status = 'T'; | |
419 | return 0; | |
420 | } | |
421 | ||
422 | *status = 'T'; | |
423 | return ((unsigned char) WSTOPSIG (w)); | |
424 | } | |
425 | ||
426 | /* Fetch inferior registers. */ | |
427 | static void | |
428 | spu_fetch_registers (int regno) | |
429 | { | |
430 | int fd; | |
431 | CORE_ADDR addr; | |
432 | ||
433 | /* ??? Some callers use 0 to mean all registers. */ | |
434 | if (regno == 0) | |
435 | regno = -1; | |
436 | ||
437 | /* We must be stopped on a spu_run system call. */ | |
438 | if (!parse_spufs_run (&fd, &addr)) | |
439 | return; | |
440 | ||
441 | /* The ID register holds the spufs file handle. */ | |
442 | if (regno == -1 || regno == SPU_ID_REGNUM) | |
443 | supply_register (SPU_ID_REGNUM, (char *)&fd); | |
444 | ||
445 | /* The NPC register is found at ADDR. */ | |
446 | if (regno == -1 || regno == SPU_PC_REGNUM) | |
447 | { | |
448 | char buf[4]; | |
449 | if (fetch_ppc_memory (addr, buf, 4) == 0) | |
450 | supply_register (SPU_PC_REGNUM, buf); | |
451 | } | |
452 | ||
453 | /* The GPRs are found in the "regs" spufs file. */ | |
454 | if (regno == -1 || (regno >= 0 && regno < SPU_NUM_CORE_REGS)) | |
455 | { | |
456 | unsigned char buf[16*SPU_NUM_CORE_REGS]; | |
457 | char annex[32]; | |
458 | int i; | |
459 | ||
460 | sprintf (annex, "%d/regs", fd); | |
461 | if (spu_proc_xfer_spu (annex, buf, NULL, 0, sizeof buf) == sizeof buf) | |
462 | for (i = 0; i < SPU_NUM_CORE_REGS; i++) | |
463 | supply_register (i, buf + i*16); | |
464 | } | |
465 | } | |
466 | ||
467 | /* Store inferior registers. */ | |
468 | static void | |
469 | spu_store_registers (int regno) | |
470 | { | |
471 | int fd; | |
472 | CORE_ADDR addr; | |
473 | ||
474 | /* ??? Some callers use 0 to mean all registers. */ | |
475 | if (regno == 0) | |
476 | regno = -1; | |
477 | ||
478 | /* We must be stopped on a spu_run system call. */ | |
479 | if (!parse_spufs_run (&fd, &addr)) | |
480 | return; | |
481 | ||
482 | /* The NPC register is found at ADDR. */ | |
483 | if (regno == -1 || regno == SPU_PC_REGNUM) | |
484 | { | |
485 | char buf[4]; | |
486 | collect_register (SPU_PC_REGNUM, buf); | |
487 | store_ppc_memory (addr, buf, 4); | |
488 | } | |
489 | ||
490 | /* The GPRs are found in the "regs" spufs file. */ | |
491 | if (regno == -1 || (regno >= 0 && regno < SPU_NUM_CORE_REGS)) | |
492 | { | |
493 | unsigned char buf[16*SPU_NUM_CORE_REGS]; | |
494 | char annex[32]; | |
495 | int i; | |
496 | ||
497 | for (i = 0; i < SPU_NUM_CORE_REGS; i++) | |
498 | collect_register (i, buf + i*16); | |
499 | ||
500 | sprintf (annex, "%d/regs", fd); | |
501 | spu_proc_xfer_spu (annex, NULL, buf, 0, sizeof buf); | |
502 | } | |
503 | } | |
504 | ||
505 | /* Copy LEN bytes from inferior's memory starting at MEMADDR | |
506 | to debugger memory starting at MYADDR. */ | |
507 | static int | |
508 | spu_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) | |
509 | { | |
510 | int fd, ret; | |
511 | CORE_ADDR addr; | |
512 | char annex[32]; | |
513 | ||
514 | /* We must be stopped on a spu_run system call. */ | |
515 | if (!parse_spufs_run (&fd, &addr)) | |
516 | return 0; | |
517 | ||
518 | /* Use the "mem" spufs file to access SPU local store. */ | |
519 | sprintf (annex, "%d/mem", fd); | |
520 | ret = spu_proc_xfer_spu (annex, myaddr, NULL, memaddr, len); | |
521 | return ret == len ? 0 : EIO; | |
522 | } | |
523 | ||
524 | /* Copy LEN bytes of data from debugger memory at MYADDR | |
525 | to inferior's memory at MEMADDR. | |
526 | On failure (cannot write the inferior) | |
527 | returns the value of errno. */ | |
528 | static int | |
529 | spu_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) | |
530 | { | |
531 | int fd, ret; | |
532 | CORE_ADDR addr; | |
533 | char annex[32]; | |
534 | ||
535 | /* We must be stopped on a spu_run system call. */ | |
536 | if (!parse_spufs_run (&fd, &addr)) | |
537 | return 0; | |
538 | ||
539 | /* Use the "mem" spufs file to access SPU local store. */ | |
540 | sprintf (annex, "%d/mem", fd); | |
541 | ret = spu_proc_xfer_spu (annex, NULL, myaddr, memaddr, len); | |
542 | return ret == len ? 0 : EIO; | |
543 | } | |
544 | ||
545 | /* Look up special symbols -- unneded here. */ | |
546 | static void | |
547 | spu_look_up_symbols (void) | |
548 | { | |
549 | } | |
550 | ||
551 | /* Send signal to inferior. */ | |
552 | static void | |
ef57601b | 553 | spu_request_interrupt (void) |
a13e2c95 | 554 | { |
ef57601b | 555 | syscall (SYS_tkill, current_tid, SIGINT); |
a13e2c95 UW |
556 | } |
557 | ||
ab39bf24 UW |
558 | static const char * |
559 | spu_arch_string (void) | |
560 | { | |
561 | return "spu"; | |
562 | } | |
563 | ||
a13e2c95 UW |
564 | \f |
565 | static struct target_ops spu_target_ops = { | |
566 | spu_create_inferior, | |
567 | spu_attach, | |
568 | spu_kill, | |
569 | spu_detach, | |
570 | spu_thread_alive, | |
571 | spu_resume, | |
572 | spu_wait, | |
573 | spu_fetch_registers, | |
574 | spu_store_registers, | |
575 | spu_read_memory, | |
576 | spu_write_memory, | |
577 | spu_look_up_symbols, | |
ef57601b | 578 | spu_request_interrupt, |
a13e2c95 | 579 | NULL, |
ab39bf24 UW |
580 | NULL, |
581 | NULL, | |
582 | NULL, | |
583 | NULL, | |
584 | NULL, | |
585 | NULL, | |
586 | spu_arch_string, | |
a13e2c95 UW |
587 | }; |
588 | ||
589 | void | |
590 | initialize_low (void) | |
591 | { | |
592 | static const unsigned char breakpoint[] = { 0x00, 0x00, 0x3f, 0xff }; | |
593 | ||
594 | set_target_ops (&spu_target_ops); | |
595 | set_breakpoint_data (breakpoint, sizeof breakpoint); | |
596 | init_registers (); | |
597 | } |