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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. */
60int using_threads = 0;
61int debug_threads = 0;
62
63
64/* Fetch PPU register REGNO. */
65static CORE_ADDR
66fetch_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. */
105static int
106fetch_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. */
124static int
125store_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. */
143static int
144fetch_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. */
168static int
169store_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. */
206static int
207parse_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. */
231static int
232spu_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. */
267static int
268spu_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. */
295int
296spu_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. */
311static void
312spu_kill (void)
313{
314 ptrace (PTRACE_KILL, current_tid, 0, 0);
315}
316
317/* Detach from inferior process. */
318static void
319spu_detach (void)
320{
321 ptrace (PTRACE_DETACH, current_tid, 0, 0);
322}
323
324/* Return nonzero if the given thread is still alive. */
325static int
326spu_thread_alive (unsigned long tid)
327{
328 return tid == current_tid;
329}
330
331/* Resume process. */
332static void
333spu_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. */
359static unsigned char
360spu_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. */
428static void
429spu_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. */
469static void
470spu_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. */
508static int
509spu_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. */
529static int
530spu_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. */
547static void
548spu_look_up_symbols (void)
549{
550}
551
552/* Send signal to inferior. */
553static void
554spu_send_signal (int signo)
555{
556 syscall (SYS_tkill, current_tid, signo);
557}
558
559\f
560static 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
577void
578initialize_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}