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