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771b4502 UW |
1 | /* SPU native-dependent code for GDB, the GNU debugger. |
2 | Copyright (C) 2006 Free Software Foundation, Inc. | |
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 "defs.h" | |
24 | #include "gdbcore.h" | |
25 | #include "gdb_string.h" | |
26 | #include "target.h" | |
27 | #include "inferior.h" | |
28 | #include "inf-ptrace.h" | |
29 | #include "regcache.h" | |
30 | #include "symfile.h" | |
31 | #include "gdb_wait.h" | |
32 | ||
33 | #include <sys/ptrace.h> | |
34 | #include <asm/ptrace.h> | |
35 | #include <sys/types.h> | |
36 | #include <sys/param.h> | |
37 | ||
38 | #include "spu-tdep.h" | |
39 | ||
40 | /* PPU side system calls. */ | |
41 | #define INSTR_SC 0x44000002 | |
42 | #define NR_spu_run 0x0116 | |
43 | ||
44 | ||
45 | /* Fetch PPU register REGNO. */ | |
46 | static CORE_ADDR | |
47 | fetch_ppc_register (int regno) | |
48 | { | |
49 | PTRACE_TYPE_RET res; | |
50 | ||
51 | int tid = TIDGET (inferior_ptid); | |
52 | if (tid == 0) | |
53 | tid = PIDGET (inferior_ptid); | |
54 | ||
55 | #ifndef __powerpc64__ | |
56 | /* If running as a 32-bit process on a 64-bit system, we attempt | |
57 | to get the full 64-bit register content of the target process. | |
58 | If the PPC special ptrace call fails, we're on a 32-bit system; | |
59 | just fall through to the regular ptrace call in that case. */ | |
60 | { | |
61 | gdb_byte buf[8]; | |
62 | ||
63 | errno = 0; | |
64 | ptrace (PPC_PTRACE_PEEKUSR_3264, tid, | |
65 | (PTRACE_TYPE_ARG3) (regno * 8), buf); | |
66 | if (errno == 0) | |
67 | ptrace (PPC_PTRACE_PEEKUSR_3264, tid, | |
68 | (PTRACE_TYPE_ARG3) (regno * 8 + 4), buf + 4); | |
69 | if (errno == 0) | |
70 | return (CORE_ADDR) *(unsigned long long *)buf; | |
71 | } | |
72 | #endif | |
73 | ||
74 | errno = 0; | |
75 | res = ptrace (PT_READ_U, tid, | |
76 | (PTRACE_TYPE_ARG3) (regno * sizeof (PTRACE_TYPE_RET)), 0); | |
77 | if (errno != 0) | |
78 | { | |
79 | char mess[128]; | |
80 | xsnprintf (mess, sizeof mess, "reading PPC register #%d", regno); | |
81 | perror_with_name (_(mess)); | |
82 | } | |
83 | ||
84 | return (CORE_ADDR) (unsigned long) res; | |
85 | } | |
86 | ||
87 | /* Fetch WORD from PPU memory at (aligned) MEMADDR in thread TID. */ | |
88 | static int | |
89 | fetch_ppc_memory_1 (int tid, CORE_ADDR memaddr, PTRACE_TYPE_RET *word) | |
90 | { | |
91 | errno = 0; | |
92 | ||
93 | #ifndef __powerpc64__ | |
94 | if (memaddr >> 32) | |
95 | { | |
96 | unsigned long long addr_8 = (unsigned long long) memaddr; | |
97 | ptrace (PPC_PTRACE_PEEKTEXT_3264, tid, (PTRACE_TYPE_ARG3) &addr_8, word); | |
98 | } | |
99 | else | |
100 | #endif | |
101 | *word = ptrace (PT_READ_I, tid, (PTRACE_TYPE_ARG3) (size_t) memaddr, 0); | |
102 | ||
103 | return errno; | |
104 | } | |
105 | ||
106 | /* Store WORD into PPU memory at (aligned) MEMADDR in thread TID. */ | |
107 | static int | |
108 | store_ppc_memory_1 (int tid, CORE_ADDR memaddr, PTRACE_TYPE_RET word) | |
109 | { | |
110 | errno = 0; | |
111 | ||
112 | #ifndef __powerpc64__ | |
113 | if (memaddr >> 32) | |
114 | { | |
115 | unsigned long long addr_8 = (unsigned long long) memaddr; | |
116 | ptrace (PPC_PTRACE_POKEDATA_3264, tid, (PTRACE_TYPE_ARG3) &addr_8, word); | |
117 | } | |
118 | else | |
119 | #endif | |
120 | ptrace (PT_WRITE_D, tid, (PTRACE_TYPE_ARG3) (size_t) memaddr, word); | |
121 | ||
122 | return errno; | |
123 | } | |
124 | ||
125 | /* Fetch LEN bytes of PPU memory at MEMADDR to MYADDR. */ | |
126 | static int | |
127 | fetch_ppc_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len) | |
128 | { | |
129 | int i, ret; | |
130 | ||
131 | CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_TYPE_RET); | |
132 | int count = ((((memaddr + len) - addr) + sizeof (PTRACE_TYPE_RET) - 1) | |
133 | / sizeof (PTRACE_TYPE_RET)); | |
134 | PTRACE_TYPE_RET *buffer; | |
135 | ||
136 | int tid = TIDGET (inferior_ptid); | |
137 | if (tid == 0) | |
138 | tid = PIDGET (inferior_ptid); | |
139 | ||
140 | buffer = (PTRACE_TYPE_RET *) alloca (count * sizeof (PTRACE_TYPE_RET)); | |
141 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_TYPE_RET)) | |
142 | if ((ret = fetch_ppc_memory_1 (tid, addr, &buffer[i])) != 0) | |
143 | return ret; | |
144 | ||
145 | memcpy (myaddr, | |
146 | (char *) buffer + (memaddr & (sizeof (PTRACE_TYPE_RET) - 1)), | |
147 | len); | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
152 | /* Store LEN bytes from MYADDR to PPU memory at MEMADDR. */ | |
153 | static int | |
154 | store_ppc_memory (CORE_ADDR memaddr, const gdb_byte *myaddr, int len) | |
155 | { | |
156 | int i, ret; | |
157 | ||
158 | CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_TYPE_RET); | |
159 | int count = ((((memaddr + len) - addr) + sizeof (PTRACE_TYPE_RET) - 1) | |
160 | / sizeof (PTRACE_TYPE_RET)); | |
161 | PTRACE_TYPE_RET *buffer; | |
162 | ||
163 | int tid = TIDGET (inferior_ptid); | |
164 | if (tid == 0) | |
165 | tid = PIDGET (inferior_ptid); | |
166 | ||
167 | buffer = (PTRACE_TYPE_RET *) alloca (count * sizeof (PTRACE_TYPE_RET)); | |
168 | ||
169 | if (addr != memaddr || len < (int) sizeof (PTRACE_TYPE_RET)) | |
170 | if ((ret = fetch_ppc_memory_1 (tid, addr, &buffer[0])) != 0) | |
171 | return ret; | |
172 | ||
173 | if (count > 1) | |
174 | if ((ret = fetch_ppc_memory_1 (tid, addr + (count - 1) | |
175 | * sizeof (PTRACE_TYPE_RET), | |
176 | &buffer[count - 1])) != 0) | |
177 | return ret; | |
178 | ||
179 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_TYPE_RET) - 1)), | |
180 | myaddr, len); | |
181 | ||
182 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_TYPE_RET)) | |
183 | if ((ret = store_ppc_memory_1 (tid, addr, buffer[i])) != 0) | |
184 | return ret; | |
185 | ||
186 | return 0; | |
187 | } | |
188 | ||
189 | ||
190 | /* If the PPU thread is currently stopped on a spu_run system call, | |
191 | return to FD and ADDR the file handle and NPC parameter address | |
192 | used with the system call. Return non-zero if successful. */ | |
193 | static int | |
194 | parse_spufs_run (int *fd, CORE_ADDR *addr) | |
195 | { | |
196 | gdb_byte buf[4]; | |
197 | CORE_ADDR pc = fetch_ppc_register (32); /* nip */ | |
198 | ||
199 | /* Fetch instruction preceding current NIP. */ | |
200 | if (fetch_ppc_memory (pc-4, buf, 4) != 0) | |
201 | return 0; | |
202 | /* It should be a "sc" instruction. */ | |
203 | if (extract_unsigned_integer (buf, 4) != INSTR_SC) | |
204 | return 0; | |
205 | /* System call number should be NR_spu_run. */ | |
206 | if (fetch_ppc_register (0) != NR_spu_run) | |
207 | return 0; | |
208 | ||
209 | /* Register 3 contains fd, register 4 the NPC param pointer. */ | |
210 | *fd = fetch_ppc_register (34); /* orig_gpr3 */ | |
211 | *addr = fetch_ppc_register (4); | |
212 | return 1; | |
213 | } | |
214 | ||
215 | ||
216 | /* Copy LEN bytes at OFFSET in spufs file ANNEX into/from READBUF or WRITEBUF, | |
217 | using the /proc file system. */ | |
218 | static LONGEST | |
219 | spu_proc_xfer_spu (const char *annex, gdb_byte *readbuf, | |
220 | const gdb_byte *writebuf, | |
221 | ULONGEST offset, LONGEST len) | |
222 | { | |
223 | char buf[128]; | |
224 | int fd = 0; | |
225 | int ret = -1; | |
226 | int pid = PIDGET (inferior_ptid); | |
227 | ||
228 | if (!annex) | |
229 | return 0; | |
230 | ||
231 | xsnprintf (buf, sizeof buf, "/proc/%d/fd/%s", pid, annex); | |
232 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
233 | if (fd <= 0) | |
234 | return -1; | |
235 | ||
236 | if (offset != 0 | |
237 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
238 | { | |
239 | close (fd); | |
240 | return -1; | |
241 | } | |
242 | ||
243 | if (writebuf) | |
244 | ret = write (fd, writebuf, (size_t) len); | |
245 | else if (readbuf) | |
246 | ret = read (fd, readbuf, (size_t) len); | |
247 | ||
248 | close (fd); | |
249 | return ret; | |
250 | } | |
251 | ||
252 | ||
253 | /* Inferior memory should contain an SPE executable image at location ADDR. | |
254 | Allocate a BFD representing that executable. Return NULL on error. */ | |
255 | ||
256 | static void * | |
257 | spu_bfd_iovec_open (struct bfd *nbfd, void *open_closure) | |
258 | { | |
259 | return open_closure; | |
260 | } | |
261 | ||
262 | static int | |
263 | spu_bfd_iovec_close (struct bfd *nbfd, void *stream) | |
264 | { | |
265 | xfree (stream); | |
266 | return 1; | |
267 | } | |
268 | ||
269 | static file_ptr | |
270 | spu_bfd_iovec_pread (struct bfd *abfd, void *stream, void *buf, | |
271 | file_ptr nbytes, file_ptr offset) | |
272 | { | |
273 | CORE_ADDR addr = *(CORE_ADDR *)stream; | |
274 | ||
275 | if (fetch_ppc_memory (addr + offset, buf, nbytes) != 0) | |
276 | { | |
277 | bfd_set_error (bfd_error_invalid_operation); | |
278 | return -1; | |
279 | } | |
280 | ||
281 | return nbytes; | |
282 | } | |
283 | ||
284 | static bfd * | |
285 | spu_bfd_open (CORE_ADDR addr) | |
286 | { | |
287 | struct bfd *nbfd; | |
288 | ||
289 | CORE_ADDR *open_closure = xmalloc (sizeof (CORE_ADDR)); | |
290 | *open_closure = addr; | |
291 | ||
292 | nbfd = bfd_openr_iovec (xstrdup ("<in-memory>"), "elf32-spu", | |
293 | spu_bfd_iovec_open, open_closure, | |
294 | spu_bfd_iovec_pread, spu_bfd_iovec_close); | |
295 | if (!nbfd) | |
296 | return NULL; | |
297 | ||
298 | if (!bfd_check_format (nbfd, bfd_object)) | |
299 | { | |
300 | bfd_close (nbfd); | |
301 | return NULL; | |
302 | } | |
303 | ||
304 | return nbfd; | |
305 | } | |
306 | ||
307 | /* INFERIOR_FD is a file handle passed by the inferior to the | |
308 | spu_run system call. Assuming the SPE context was allocated | |
309 | by the libspe library, try to retrieve the main SPE executable | |
310 | file from its copy within the target process. */ | |
311 | static void | |
312 | spu_symbol_file_add_from_memory (int inferior_fd) | |
313 | { | |
314 | CORE_ADDR addr; | |
315 | struct bfd *nbfd; | |
316 | ||
317 | char id[128]; | |
318 | char annex[32]; | |
319 | int len; | |
320 | ||
321 | /* Read object ID. */ | |
322 | xsnprintf (annex, sizeof annex, "%d/object-id", inferior_fd); | |
323 | len = spu_proc_xfer_spu (annex, id, NULL, 0, sizeof id); | |
324 | if (len <= 0 || len >= sizeof id) | |
325 | return; | |
326 | id[len] = 0; | |
327 | if (sscanf (id, "0x%llx", &addr) != 1) | |
328 | return; | |
329 | ||
330 | /* Open BFD representing SPE executable and read its symbols. */ | |
331 | nbfd = spu_bfd_open (addr); | |
332 | if (nbfd) | |
333 | symbol_file_add_from_bfd (nbfd, 0, NULL, 1, 0); | |
334 | } | |
335 | ||
336 | ||
337 | /* Override the post_startup_inferior routine to continue running | |
338 | the inferior until the first spu_run system call. */ | |
339 | static void | |
340 | spu_child_post_startup_inferior (ptid_t ptid) | |
341 | { | |
342 | int fd; | |
343 | CORE_ADDR addr; | |
344 | ||
345 | int tid = TIDGET (ptid); | |
346 | if (tid == 0) | |
347 | tid = PIDGET (ptid); | |
348 | ||
349 | while (!parse_spufs_run (&fd, &addr)) | |
350 | { | |
351 | ptrace (PT_SYSCALL, tid, (PTRACE_TYPE_ARG3) 0, 0); | |
352 | waitpid (tid, NULL, __WALL | __WNOTHREAD); | |
353 | } | |
354 | } | |
355 | ||
356 | /* Override the post_attach routine to try load the SPE executable | |
357 | file image from its copy inside the target process. */ | |
358 | static void | |
359 | spu_child_post_attach (int pid) | |
360 | { | |
361 | int fd; | |
362 | CORE_ADDR addr; | |
363 | ||
364 | /* Like child_post_startup_inferior, if we happened to attach to | |
365 | the inferior while it wasn't currently in spu_run, continue | |
366 | running it until we get back there. */ | |
367 | while (!parse_spufs_run (&fd, &addr)) | |
368 | { | |
369 | ptrace (PT_SYSCALL, pid, (PTRACE_TYPE_ARG3) 0, 0); | |
370 | waitpid (pid, NULL, __WALL | __WNOTHREAD); | |
371 | } | |
372 | ||
373 | /* If the user has not provided an executable file, try to extract | |
374 | the image from inside the target process. */ | |
375 | if (!get_exec_file (0)) | |
376 | spu_symbol_file_add_from_memory (fd); | |
377 | } | |
378 | ||
379 | /* Wait for child PTID to do something. Return id of the child, | |
380 | minus_one_ptid in case of error; store status into *OURSTATUS. */ | |
381 | static ptid_t | |
382 | spu_child_wait (ptid_t ptid, struct target_waitstatus *ourstatus) | |
383 | { | |
384 | int save_errno; | |
385 | int status; | |
386 | pid_t pid; | |
387 | ||
388 | do | |
389 | { | |
390 | set_sigint_trap (); /* Causes SIGINT to be passed on to the | |
391 | attached process. */ | |
392 | set_sigio_trap (); | |
393 | ||
394 | pid = waitpid (PIDGET (ptid), &status, 0); | |
395 | if (pid == -1 && errno == ECHILD) | |
396 | /* Try again with __WCLONE to check cloned processes. */ | |
397 | pid = waitpid (PIDGET (ptid), &status, __WCLONE); | |
398 | ||
399 | save_errno = errno; | |
400 | ||
401 | /* Make sure we don't report an event for the exit of the | |
402 | original program, if we've detached from it. */ | |
403 | if (pid != -1 && !WIFSTOPPED (status) && pid != PIDGET (inferior_ptid)) | |
404 | { | |
405 | pid = -1; | |
406 | save_errno = EINTR; | |
407 | } | |
408 | ||
409 | clear_sigio_trap (); | |
410 | clear_sigint_trap (); | |
411 | } | |
412 | while (pid == -1 && save_errno == EINTR); | |
413 | ||
414 | if (pid == -1) | |
415 | { | |
416 | warning ("Child process unexpectedly missing: %s", | |
417 | safe_strerror (save_errno)); | |
418 | ||
419 | /* Claim it exited with unknown signal. */ | |
420 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
421 | ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN; | |
422 | return minus_one_ptid; | |
423 | } | |
424 | ||
425 | store_waitstatus (ourstatus, status); | |
426 | return pid_to_ptid (pid); | |
427 | } | |
428 | ||
429 | /* Override the fetch_inferior_register routine. */ | |
430 | static void | |
431 | spu_fetch_inferior_registers (int regno) | |
432 | { | |
433 | int fd; | |
434 | CORE_ADDR addr; | |
435 | ||
436 | /* We must be stopped on a spu_run system call. */ | |
437 | if (!parse_spufs_run (&fd, &addr)) | |
438 | return; | |
439 | ||
440 | /* The ID register holds the spufs file handle. */ | |
441 | if (regno == -1 || regno == SPU_ID_REGNUM) | |
442 | { | |
443 | char buf[4]; | |
444 | store_unsigned_integer (buf, 4, fd); | |
445 | regcache_raw_supply (current_regcache, SPU_ID_REGNUM, buf); | |
446 | } | |
447 | ||
448 | /* The NPC register is found at ADDR. */ | |
449 | if (regno == -1 || regno == SPU_PC_REGNUM) | |
450 | { | |
451 | gdb_byte buf[4]; | |
452 | if (fetch_ppc_memory (addr, buf, 4) == 0) | |
453 | regcache_raw_supply (current_regcache, SPU_PC_REGNUM, buf); | |
454 | } | |
455 | ||
456 | /* The GPRs are found in the "regs" spufs file. */ | |
457 | if (regno == -1 || (regno >= 0 && regno < SPU_NUM_GPRS)) | |
458 | { | |
459 | gdb_byte buf[16 * SPU_NUM_GPRS]; | |
460 | char annex[32]; | |
461 | int i; | |
462 | ||
463 | xsnprintf (annex, sizeof annex, "%d/regs", fd); | |
464 | if (spu_proc_xfer_spu (annex, buf, NULL, 0, sizeof buf) == sizeof buf) | |
465 | for (i = 0; i < SPU_NUM_GPRS; i++) | |
466 | regcache_raw_supply (current_regcache, i, buf + i*16); | |
467 | } | |
468 | } | |
469 | ||
470 | /* Override the store_inferior_register routine. */ | |
471 | static void | |
472 | spu_store_inferior_registers (int regno) | |
473 | { | |
474 | int fd; | |
475 | CORE_ADDR addr; | |
476 | ||
477 | /* We must be stopped on a spu_run system call. */ | |
478 | if (!parse_spufs_run (&fd, &addr)) | |
479 | return; | |
480 | ||
481 | /* The NPC register is found at ADDR. */ | |
482 | if (regno == -1 || regno == SPU_PC_REGNUM) | |
483 | { | |
484 | gdb_byte buf[4]; | |
485 | regcache_raw_collect (current_regcache, SPU_PC_REGNUM, buf); | |
486 | store_ppc_memory (addr, buf, 4); | |
487 | } | |
488 | ||
489 | /* The GPRs are found in the "regs" spufs file. */ | |
490 | if (regno == -1 || (regno >= 0 && regno < SPU_NUM_GPRS)) | |
491 | { | |
492 | gdb_byte buf[16 * SPU_NUM_GPRS]; | |
493 | char annex[32]; | |
494 | int i; | |
495 | ||
496 | for (i = 0; i < SPU_NUM_GPRS; i++) | |
497 | regcache_raw_collect (current_regcache, i, buf + i*16); | |
498 | ||
499 | xsnprintf (annex, sizeof annex, "%d/regs", fd); | |
500 | spu_proc_xfer_spu (annex, NULL, buf, 0, sizeof buf); | |
501 | } | |
502 | } | |
503 | ||
504 | /* Override the to_xfer_partial routine. */ | |
505 | static LONGEST | |
506 | spu_xfer_partial (struct target_ops *ops, | |
507 | enum target_object object, const char *annex, | |
508 | gdb_byte *readbuf, const gdb_byte *writebuf, | |
509 | ULONGEST offset, LONGEST len) | |
510 | { | |
511 | if (object == TARGET_OBJECT_MEMORY) | |
512 | { | |
513 | int fd; | |
514 | CORE_ADDR addr; | |
515 | char mem_annex[32]; | |
516 | ||
517 | /* We must be stopped on a spu_run system call. */ | |
518 | if (!parse_spufs_run (&fd, &addr)) | |
519 | return 0; | |
520 | ||
521 | /* Use the "mem" spufs file to access SPU local store. */ | |
522 | xsnprintf (mem_annex, sizeof mem_annex, "%d/mem", fd); | |
523 | return spu_proc_xfer_spu (mem_annex, readbuf, writebuf, offset, len); | |
524 | } | |
525 | ||
526 | return 0; | |
527 | } | |
528 | ||
529 | /* Override the to_can_use_hw_breakpoint routine. */ | |
530 | static int | |
531 | spu_can_use_hw_breakpoint (int type, int cnt, int othertype) | |
532 | { | |
533 | return 0; | |
534 | } | |
535 | ||
536 | ||
537 | /* Initialize SPU native target. */ | |
538 | void | |
539 | _initialize_spu_nat (void) | |
540 | { | |
541 | /* Generic ptrace methods. */ | |
542 | struct target_ops *t; | |
543 | t = inf_ptrace_target (); | |
544 | ||
545 | /* Add SPU methods. */ | |
546 | t->to_post_attach = spu_child_post_attach; | |
547 | t->to_post_startup_inferior = spu_child_post_startup_inferior; | |
548 | t->to_wait = spu_child_wait; | |
549 | t->to_fetch_registers = spu_fetch_inferior_registers; | |
550 | t->to_store_registers = spu_store_inferior_registers; | |
551 | t->to_xfer_partial = spu_xfer_partial; | |
552 | t->to_can_use_hw_breakpoint = spu_can_use_hw_breakpoint; | |
553 | ||
554 | /* Register SPU target. */ | |
555 | add_target (t); | |
556 | } | |
557 |